LCOV - code coverage report
Current view: top level - lib/nvme - nvme_rdma.c (source / functions) Hit Total Coverage
Test: ut_cov_unit.info Lines: 708 1538 46.0 %
Date: 2024-07-11 16:21:08 Functions: 46 90 51.1 %

          Line data    Source code
       1             : /*   SPDX-License-Identifier: BSD-3-Clause
       2             :  *   Copyright (C) 2016 Intel Corporation. All rights reserved.
       3             :  *   Copyright (c) 2019-2021 Mellanox Technologies LTD. All rights reserved.
       4             :  *   Copyright (c) 2021-2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
       5             :  */
       6             : 
       7             : /*
       8             :  * NVMe over RDMA transport
       9             :  */
      10             : 
      11             : #include "spdk/stdinc.h"
      12             : 
      13             : #include "spdk/assert.h"
      14             : #include "spdk/dma.h"
      15             : #include "spdk/log.h"
      16             : #include "spdk/trace.h"
      17             : #include "spdk/queue.h"
      18             : #include "spdk/nvme.h"
      19             : #include "spdk/nvmf_spec.h"
      20             : #include "spdk/string.h"
      21             : #include "spdk/endian.h"
      22             : #include "spdk/likely.h"
      23             : #include "spdk/config.h"
      24             : 
      25             : #include "nvme_internal.h"
      26             : #include "spdk_internal/rdma.h"
      27             : 
      28             : #define NVME_RDMA_TIME_OUT_IN_MS 2000
      29             : #define NVME_RDMA_RW_BUFFER_SIZE 131072
      30             : 
      31             : /*
      32             :  * NVME RDMA qpair Resource Defaults
      33             :  */
      34             : #define NVME_RDMA_DEFAULT_TX_SGE                2
      35             : #define NVME_RDMA_DEFAULT_RX_SGE                1
      36             : 
      37             : /* Max number of NVMe-oF SGL descriptors supported by the host */
      38             : #define NVME_RDMA_MAX_SGL_DESCRIPTORS           16
      39             : 
      40             : /* number of STAILQ entries for holding pending RDMA CM events. */
      41             : #define NVME_RDMA_NUM_CM_EVENTS                 256
      42             : 
      43             : /* CM event processing timeout */
      44             : #define NVME_RDMA_QPAIR_CM_EVENT_TIMEOUT_US     1000000
      45             : 
      46             : /* The default size for a shared rdma completion queue. */
      47             : #define DEFAULT_NVME_RDMA_CQ_SIZE               4096
      48             : 
      49             : /*
      50             :  * In the special case of a stale connection we don't expose a mechanism
      51             :  * for the user to retry the connection so we need to handle it internally.
      52             :  */
      53             : #define NVME_RDMA_STALE_CONN_RETRY_MAX          5
      54             : #define NVME_RDMA_STALE_CONN_RETRY_DELAY_US     10000
      55             : 
      56             : /*
      57             :  * Maximum value of transport_retry_count used by RDMA controller
      58             :  */
      59             : #define NVME_RDMA_CTRLR_MAX_TRANSPORT_RETRY_COUNT       7
      60             : 
      61             : /*
      62             :  * Maximum value of transport_ack_timeout used by RDMA controller
      63             :  */
      64             : #define NVME_RDMA_CTRLR_MAX_TRANSPORT_ACK_TIMEOUT       31
      65             : 
      66             : /*
      67             :  * Number of microseconds to wait until the lingering qpair becomes quiet.
      68             :  */
      69             : #define NVME_RDMA_DISCONNECTED_QPAIR_TIMEOUT_US 1000000ull
      70             : 
      71             : /*
      72             :  * The max length of keyed SGL data block (3 bytes)
      73             :  */
      74             : #define NVME_RDMA_MAX_KEYED_SGL_LENGTH ((1u << 24u) - 1)
      75             : 
      76             : #define WC_PER_QPAIR(queue_depth)       (queue_depth * 2)
      77             : 
      78             : #define NVME_RDMA_POLL_GROUP_CHECK_QPN(_rqpair, qpn)                            \
      79             :         ((_rqpair)->rdma_qp && (_rqpair)->rdma_qp->qp->qp_num == (qpn))     \
      80             : 
      81             : struct nvme_rdma_memory_domain {
      82             :         TAILQ_ENTRY(nvme_rdma_memory_domain) link;
      83             :         uint32_t ref;
      84             :         struct ibv_pd *pd;
      85             :         struct spdk_memory_domain *domain;
      86             :         struct spdk_memory_domain_rdma_ctx rdma_ctx;
      87             : };
      88             : 
      89             : enum nvme_rdma_wr_type {
      90             :         RDMA_WR_TYPE_RECV,
      91             :         RDMA_WR_TYPE_SEND,
      92             : };
      93             : 
      94             : struct nvme_rdma_wr {
      95             :         /* Using this instead of the enum allows this struct to only occupy one byte. */
      96             :         uint8_t type;
      97             : };
      98             : 
      99             : struct spdk_nvmf_cmd {
     100             :         struct spdk_nvme_cmd cmd;
     101             :         struct spdk_nvme_sgl_descriptor sgl[NVME_RDMA_MAX_SGL_DESCRIPTORS];
     102             : };
     103             : 
     104             : struct spdk_nvme_rdma_hooks g_nvme_hooks = {};
     105             : 
     106             : /* STAILQ wrapper for cm events. */
     107             : struct nvme_rdma_cm_event_entry {
     108             :         struct rdma_cm_event                    *evt;
     109             :         STAILQ_ENTRY(nvme_rdma_cm_event_entry)  link;
     110             : };
     111             : 
     112             : /* NVMe RDMA transport extensions for spdk_nvme_ctrlr */
     113             : struct nvme_rdma_ctrlr {
     114             :         struct spdk_nvme_ctrlr                  ctrlr;
     115             : 
     116             :         uint16_t                                max_sge;
     117             : 
     118             :         struct rdma_event_channel               *cm_channel;
     119             : 
     120             :         STAILQ_HEAD(, nvme_rdma_cm_event_entry) pending_cm_events;
     121             : 
     122             :         STAILQ_HEAD(, nvme_rdma_cm_event_entry) free_cm_events;
     123             : 
     124             :         struct nvme_rdma_cm_event_entry         *cm_events;
     125             : };
     126             : 
     127             : struct nvme_rdma_poller_stats {
     128             :         uint64_t polls;
     129             :         uint64_t idle_polls;
     130             :         uint64_t queued_requests;
     131             :         uint64_t completions;
     132             :         struct spdk_rdma_qp_stats rdma_stats;
     133             : };
     134             : 
     135             : struct nvme_rdma_poll_group;
     136             : struct nvme_rdma_rsps;
     137             : 
     138             : struct nvme_rdma_poller {
     139             :         struct ibv_context              *device;
     140             :         struct ibv_cq                   *cq;
     141             :         struct spdk_rdma_srq            *srq;
     142             :         struct nvme_rdma_rsps           *rsps;
     143             :         struct ibv_pd                   *pd;
     144             :         struct spdk_rdma_mem_map        *mr_map;
     145             :         uint32_t                        refcnt;
     146             :         int                             required_num_wc;
     147             :         int                             current_num_wc;
     148             :         struct nvme_rdma_poller_stats   stats;
     149             :         struct nvme_rdma_poll_group     *group;
     150             :         STAILQ_ENTRY(nvme_rdma_poller)  link;
     151             : };
     152             : 
     153             : struct nvme_rdma_qpair;
     154             : 
     155             : struct nvme_rdma_poll_group {
     156             :         struct spdk_nvme_transport_poll_group           group;
     157             :         STAILQ_HEAD(, nvme_rdma_poller)                 pollers;
     158             :         uint32_t                                        num_pollers;
     159             :         TAILQ_HEAD(, nvme_rdma_qpair)                   connecting_qpairs;
     160             : };
     161             : 
     162             : enum nvme_rdma_qpair_state {
     163             :         NVME_RDMA_QPAIR_STATE_INVALID = 0,
     164             :         NVME_RDMA_QPAIR_STATE_STALE_CONN,
     165             :         NVME_RDMA_QPAIR_STATE_INITIALIZING,
     166             :         NVME_RDMA_QPAIR_STATE_FABRIC_CONNECT_SEND,
     167             :         NVME_RDMA_QPAIR_STATE_FABRIC_CONNECT_POLL,
     168             :         NVME_RDMA_QPAIR_STATE_RUNNING,
     169             :         NVME_RDMA_QPAIR_STATE_EXITING,
     170             :         NVME_RDMA_QPAIR_STATE_LINGERING,
     171             :         NVME_RDMA_QPAIR_STATE_EXITED,
     172             : };
     173             : 
     174             : typedef int (*nvme_rdma_cm_event_cb)(struct nvme_rdma_qpair *rqpair, int ret);
     175             : 
     176             : struct nvme_rdma_rsp_opts {
     177             :         uint16_t                                num_entries;
     178             :         struct nvme_rdma_qpair                  *rqpair;
     179             :         struct spdk_rdma_srq                    *srq;
     180             :         struct spdk_rdma_mem_map                *mr_map;
     181             : };
     182             : 
     183             : struct nvme_rdma_rsps {
     184             :         /* Parallel arrays of response buffers + response SGLs of size num_entries */
     185             :         struct ibv_sge                          *rsp_sgls;
     186             :         struct spdk_nvme_rdma_rsp               *rsps;
     187             : 
     188             :         struct ibv_recv_wr                      *rsp_recv_wrs;
     189             : 
     190             :         /* Count of outstanding recv objects */
     191             :         uint16_t                                current_num_recvs;
     192             : 
     193             :         uint16_t                                num_entries;
     194             : };
     195             : 
     196             : /* NVMe RDMA qpair extensions for spdk_nvme_qpair */
     197             : struct nvme_rdma_qpair {
     198             :         struct spdk_nvme_qpair                  qpair;
     199             : 
     200             :         struct spdk_rdma_qp                     *rdma_qp;
     201             :         struct rdma_cm_id                       *cm_id;
     202             :         struct ibv_cq                           *cq;
     203             :         struct spdk_rdma_srq                    *srq;
     204             : 
     205             :         struct  spdk_nvme_rdma_req              *rdma_reqs;
     206             : 
     207             :         uint32_t                                max_send_sge;
     208             : 
     209             :         uint32_t                                max_recv_sge;
     210             : 
     211             :         uint16_t                                num_entries;
     212             : 
     213             :         bool                                    delay_cmd_submit;
     214             : 
     215             :         uint32_t                                num_completions;
     216             : 
     217             :         struct nvme_rdma_rsps                   *rsps;
     218             : 
     219             :         /*
     220             :          * Array of num_entries NVMe commands registered as RDMA message buffers.
     221             :          * Indexed by rdma_req->id.
     222             :          */
     223             :         struct spdk_nvmf_cmd                    *cmds;
     224             : 
     225             :         struct spdk_rdma_mem_map                *mr_map;
     226             : 
     227             :         TAILQ_HEAD(, spdk_nvme_rdma_req)        free_reqs;
     228             :         TAILQ_HEAD(, spdk_nvme_rdma_req)        outstanding_reqs;
     229             : 
     230             :         struct nvme_rdma_memory_domain          *memory_domain;
     231             : 
     232             :         /* Count of outstanding send objects */
     233             :         uint16_t                                current_num_sends;
     234             : 
     235             :         /* Placed at the end of the struct since it is not used frequently */
     236             :         struct rdma_cm_event                    *evt;
     237             :         struct nvme_rdma_poller                 *poller;
     238             : 
     239             :         uint64_t                                evt_timeout_ticks;
     240             :         nvme_rdma_cm_event_cb                   evt_cb;
     241             :         enum rdma_cm_event_type                 expected_evt_type;
     242             : 
     243             :         enum nvme_rdma_qpair_state              state;
     244             : 
     245             :         bool                                    in_connect_poll;
     246             : 
     247             :         uint8_t                                 stale_conn_retry_count;
     248             :         bool                                    need_destroy;
     249             : 
     250             :         TAILQ_ENTRY(nvme_rdma_qpair)            link_connecting;
     251             : };
     252             : 
     253             : enum NVME_RDMA_COMPLETION_FLAGS {
     254             :         NVME_RDMA_SEND_COMPLETED = 1u << 0,
     255             :         NVME_RDMA_RECV_COMPLETED = 1u << 1,
     256             : };
     257             : 
     258             : struct spdk_nvme_rdma_req {
     259             :         uint16_t                                id;
     260             :         uint16_t                                completion_flags: 2;
     261             :         uint16_t                                reserved: 14;
     262             :         /* if completion of RDMA_RECV received before RDMA_SEND, we will complete nvme request
     263             :          * during processing of RDMA_SEND. To complete the request we must know the response
     264             :          * received in RDMA_RECV, so store it in this field */
     265             :         struct spdk_nvme_rdma_rsp               *rdma_rsp;
     266             : 
     267             :         struct nvme_rdma_wr                     rdma_wr;
     268             : 
     269             :         struct ibv_send_wr                      send_wr;
     270             : 
     271             :         struct nvme_request                     *req;
     272             : 
     273             :         struct ibv_sge                          send_sgl[NVME_RDMA_DEFAULT_TX_SGE];
     274             : 
     275             :         TAILQ_ENTRY(spdk_nvme_rdma_req)         link;
     276             : };
     277             : 
     278             : struct spdk_nvme_rdma_rsp {
     279             :         struct spdk_nvme_cpl    cpl;
     280             :         struct nvme_rdma_qpair  *rqpair;
     281             :         struct ibv_recv_wr      *recv_wr;
     282             :         struct nvme_rdma_wr     rdma_wr;
     283             : };
     284             : 
     285             : struct nvme_rdma_memory_translation_ctx {
     286             :         void *addr;
     287             :         size_t length;
     288             :         uint32_t lkey;
     289             :         uint32_t rkey;
     290             : };
     291             : 
     292             : static const char *rdma_cm_event_str[] = {
     293             :         "RDMA_CM_EVENT_ADDR_RESOLVED",
     294             :         "RDMA_CM_EVENT_ADDR_ERROR",
     295             :         "RDMA_CM_EVENT_ROUTE_RESOLVED",
     296             :         "RDMA_CM_EVENT_ROUTE_ERROR",
     297             :         "RDMA_CM_EVENT_CONNECT_REQUEST",
     298             :         "RDMA_CM_EVENT_CONNECT_RESPONSE",
     299             :         "RDMA_CM_EVENT_CONNECT_ERROR",
     300             :         "RDMA_CM_EVENT_UNREACHABLE",
     301             :         "RDMA_CM_EVENT_REJECTED",
     302             :         "RDMA_CM_EVENT_ESTABLISHED",
     303             :         "RDMA_CM_EVENT_DISCONNECTED",
     304             :         "RDMA_CM_EVENT_DEVICE_REMOVAL",
     305             :         "RDMA_CM_EVENT_MULTICAST_JOIN",
     306             :         "RDMA_CM_EVENT_MULTICAST_ERROR",
     307             :         "RDMA_CM_EVENT_ADDR_CHANGE",
     308             :         "RDMA_CM_EVENT_TIMEWAIT_EXIT"
     309             : };
     310             : 
     311             : static struct nvme_rdma_poller *nvme_rdma_poll_group_get_poller(struct nvme_rdma_poll_group *group,
     312             :                 struct ibv_context *device);
     313             : static void nvme_rdma_poll_group_put_poller(struct nvme_rdma_poll_group *group,
     314             :                 struct nvme_rdma_poller *poller);
     315             : 
     316             : static TAILQ_HEAD(, nvme_rdma_memory_domain) g_memory_domains = TAILQ_HEAD_INITIALIZER(
     317             :                         g_memory_domains);
     318             : static pthread_mutex_t g_memory_domains_lock = PTHREAD_MUTEX_INITIALIZER;
     319             : 
     320             : static struct nvme_rdma_memory_domain *
     321           6 : nvme_rdma_get_memory_domain(struct ibv_pd *pd)
     322             : {
     323           6 :         struct nvme_rdma_memory_domain *domain = NULL;
     324           6 :         struct spdk_memory_domain_ctx ctx;
     325             :         int rc;
     326             : 
     327           6 :         pthread_mutex_lock(&g_memory_domains_lock);
     328             : 
     329          11 :         TAILQ_FOREACH(domain, &g_memory_domains, link) {
     330           7 :                 if (domain->pd == pd) {
     331           2 :                         domain->ref++;
     332           2 :                         pthread_mutex_unlock(&g_memory_domains_lock);
     333           2 :                         return domain;
     334             :                 }
     335             :         }
     336             : 
     337           4 :         domain = calloc(1, sizeof(*domain));
     338           4 :         if (!domain) {
     339           0 :                 SPDK_ERRLOG("Memory allocation failed\n");
     340           0 :                 pthread_mutex_unlock(&g_memory_domains_lock);
     341           0 :                 return NULL;
     342             :         }
     343             : 
     344           4 :         domain->rdma_ctx.size = sizeof(domain->rdma_ctx);
     345           4 :         domain->rdma_ctx.ibv_pd = pd;
     346           4 :         ctx.size = sizeof(ctx);
     347           4 :         ctx.user_ctx = &domain->rdma_ctx;
     348             : 
     349           4 :         rc = spdk_memory_domain_create(&domain->domain, SPDK_DMA_DEVICE_TYPE_RDMA, &ctx,
     350             :                                        SPDK_RDMA_DMA_DEVICE);
     351           4 :         if (rc) {
     352           1 :                 SPDK_ERRLOG("Failed to create memory domain\n");
     353           1 :                 free(domain);
     354           1 :                 pthread_mutex_unlock(&g_memory_domains_lock);
     355           1 :                 return NULL;
     356             :         }
     357             : 
     358           3 :         domain->pd = pd;
     359           3 :         domain->ref = 1;
     360           3 :         TAILQ_INSERT_TAIL(&g_memory_domains, domain, link);
     361             : 
     362           3 :         pthread_mutex_unlock(&g_memory_domains_lock);
     363             : 
     364           3 :         return domain;
     365             : }
     366             : 
     367             : static void
     368           5 : nvme_rdma_put_memory_domain(struct nvme_rdma_memory_domain *device)
     369             : {
     370           5 :         if (!device) {
     371           1 :                 return;
     372             :         }
     373             : 
     374           4 :         pthread_mutex_lock(&g_memory_domains_lock);
     375             : 
     376           4 :         assert(device->ref > 0);
     377             : 
     378           4 :         device->ref--;
     379             : 
     380           4 :         if (device->ref == 0) {
     381           2 :                 spdk_memory_domain_destroy(device->domain);
     382           2 :                 TAILQ_REMOVE(&g_memory_domains, device, link);
     383           2 :                 free(device);
     384             :         }
     385             : 
     386           4 :         pthread_mutex_unlock(&g_memory_domains_lock);
     387             : }
     388             : 
     389             : static int nvme_rdma_ctrlr_delete_io_qpair(struct spdk_nvme_ctrlr *ctrlr,
     390             :                 struct spdk_nvme_qpair *qpair);
     391             : 
     392             : static inline struct nvme_rdma_qpair *
     393          18 : nvme_rdma_qpair(struct spdk_nvme_qpair *qpair)
     394             : {
     395          18 :         assert(qpair->trtype == SPDK_NVME_TRANSPORT_RDMA);
     396          18 :         return SPDK_CONTAINEROF(qpair, struct nvme_rdma_qpair, qpair);
     397             : }
     398             : 
     399             : static inline struct nvme_rdma_poll_group *
     400           8 : nvme_rdma_poll_group(struct spdk_nvme_transport_poll_group *group)
     401             : {
     402           8 :         return (SPDK_CONTAINEROF(group, struct nvme_rdma_poll_group, group));
     403             : }
     404             : 
     405             : static inline struct nvme_rdma_ctrlr *
     406           8 : nvme_rdma_ctrlr(struct spdk_nvme_ctrlr *ctrlr)
     407             : {
     408           8 :         assert(ctrlr->trid.trtype == SPDK_NVME_TRANSPORT_RDMA);
     409           8 :         return SPDK_CONTAINEROF(ctrlr, struct nvme_rdma_ctrlr, ctrlr);
     410             : }
     411             : 
     412             : static struct spdk_nvme_rdma_req *
     413           3 : nvme_rdma_req_get(struct nvme_rdma_qpair *rqpair)
     414             : {
     415             :         struct spdk_nvme_rdma_req *rdma_req;
     416             : 
     417           3 :         rdma_req = TAILQ_FIRST(&rqpair->free_reqs);
     418           3 :         if (rdma_req) {
     419           2 :                 TAILQ_REMOVE(&rqpair->free_reqs, rdma_req, link);
     420             :         }
     421             : 
     422           3 :         return rdma_req;
     423             : }
     424             : 
     425             : static void
     426           1 : nvme_rdma_req_put(struct nvme_rdma_qpair *rqpair, struct spdk_nvme_rdma_req *rdma_req)
     427             : {
     428           1 :         rdma_req->completion_flags = 0;
     429           1 :         rdma_req->req = NULL;
     430           1 :         rdma_req->rdma_rsp = NULL;
     431           1 :         TAILQ_INSERT_HEAD(&rqpair->free_reqs, rdma_req, link);
     432           1 : }
     433             : 
     434             : static void
     435           0 : nvme_rdma_req_complete(struct spdk_nvme_rdma_req *rdma_req,
     436             :                        struct spdk_nvme_cpl *rsp,
     437             :                        bool print_on_error)
     438             : {
     439           0 :         struct nvme_request *req = rdma_req->req;
     440             :         struct nvme_rdma_qpair *rqpair;
     441             :         struct spdk_nvme_qpair *qpair;
     442             :         bool error, print_error;
     443             : 
     444           0 :         assert(req != NULL);
     445             : 
     446           0 :         qpair = req->qpair;
     447           0 :         rqpair = nvme_rdma_qpair(qpair);
     448             : 
     449           0 :         error = spdk_nvme_cpl_is_error(rsp);
     450           0 :         print_error = error && print_on_error && !qpair->ctrlr->opts.disable_error_logging;
     451             : 
     452           0 :         if (print_error) {
     453           0 :                 spdk_nvme_qpair_print_command(qpair, &req->cmd);
     454             :         }
     455             : 
     456           0 :         if (print_error || SPDK_DEBUGLOG_FLAG_ENABLED("nvme")) {
     457           0 :                 spdk_nvme_qpair_print_completion(qpair, rsp);
     458             :         }
     459             : 
     460           0 :         TAILQ_REMOVE(&rqpair->outstanding_reqs, rdma_req, link);
     461             : 
     462           0 :         nvme_complete_request(req->cb_fn, req->cb_arg, qpair, req, rsp);
     463           0 :         nvme_rdma_req_put(rqpair, rdma_req);
     464           0 : }
     465             : 
     466             : static const char *
     467           4 : nvme_rdma_cm_event_str_get(uint32_t event)
     468             : {
     469           4 :         if (event < SPDK_COUNTOF(rdma_cm_event_str)) {
     470           4 :                 return rdma_cm_event_str[event];
     471             :         } else {
     472           0 :                 return "Undefined";
     473             :         }
     474             : }
     475             : 
     476             : 
     477             : static int
     478          12 : nvme_rdma_qpair_process_cm_event(struct nvme_rdma_qpair *rqpair)
     479             : {
     480          12 :         struct rdma_cm_event                            *event = rqpair->evt;
     481             :         struct spdk_nvmf_rdma_accept_private_data       *accept_data;
     482          12 :         int                                             rc = 0;
     483             : 
     484          12 :         if (event) {
     485          12 :                 switch (event->event) {
     486           1 :                 case RDMA_CM_EVENT_ADDR_RESOLVED:
     487             :                 case RDMA_CM_EVENT_ADDR_ERROR:
     488             :                 case RDMA_CM_EVENT_ROUTE_RESOLVED:
     489             :                 case RDMA_CM_EVENT_ROUTE_ERROR:
     490           1 :                         break;
     491           1 :                 case RDMA_CM_EVENT_CONNECT_REQUEST:
     492           1 :                         break;
     493           1 :                 case RDMA_CM_EVENT_CONNECT_ERROR:
     494           1 :                         break;
     495           1 :                 case RDMA_CM_EVENT_UNREACHABLE:
     496             :                 case RDMA_CM_EVENT_REJECTED:
     497           1 :                         break;
     498           2 :                 case RDMA_CM_EVENT_CONNECT_RESPONSE:
     499           2 :                         rc = spdk_rdma_qp_complete_connect(rqpair->rdma_qp);
     500             :                 /* fall through */
     501           2 :                 case RDMA_CM_EVENT_ESTABLISHED:
     502           2 :                         accept_data = (struct spdk_nvmf_rdma_accept_private_data *)event->param.conn.private_data;
     503           2 :                         if (accept_data == NULL) {
     504           1 :                                 rc = -1;
     505             :                         } else {
     506           1 :                                 SPDK_DEBUGLOG(nvme, "Requested queue depth %d. Target receive queue depth %d.\n",
     507             :                                               rqpair->num_entries + 1, accept_data->crqsize);
     508             :                         }
     509           2 :                         break;
     510           1 :                 case RDMA_CM_EVENT_DISCONNECTED:
     511           1 :                         rqpair->qpair.transport_failure_reason = SPDK_NVME_QPAIR_FAILURE_REMOTE;
     512           1 :                         break;
     513           1 :                 case RDMA_CM_EVENT_DEVICE_REMOVAL:
     514           1 :                         rqpair->qpair.transport_failure_reason = SPDK_NVME_QPAIR_FAILURE_LOCAL;
     515           1 :                         rqpair->need_destroy = true;
     516           1 :                         break;
     517           1 :                 case RDMA_CM_EVENT_MULTICAST_JOIN:
     518             :                 case RDMA_CM_EVENT_MULTICAST_ERROR:
     519           1 :                         break;
     520           1 :                 case RDMA_CM_EVENT_ADDR_CHANGE:
     521           1 :                         rqpair->qpair.transport_failure_reason = SPDK_NVME_QPAIR_FAILURE_LOCAL;
     522           1 :                         break;
     523           1 :                 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
     524           1 :                         break;
     525           1 :                 default:
     526           1 :                         SPDK_ERRLOG("Unexpected Acceptor Event [%d]\n", event->event);
     527           1 :                         break;
     528             :                 }
     529          12 :                 rqpair->evt = NULL;
     530          12 :                 rdma_ack_cm_event(event);
     531             :         }
     532             : 
     533          12 :         return rc;
     534             : }
     535             : 
     536             : /*
     537             :  * This function must be called under the nvme controller's lock
     538             :  * because it touches global controller variables. The lock is taken
     539             :  * by the generic transport code before invoking a few of the functions
     540             :  * in this file: nvme_rdma_ctrlr_connect_qpair, nvme_rdma_ctrlr_delete_io_qpair,
     541             :  * and conditionally nvme_rdma_qpair_process_completions when it is calling
     542             :  * completions on the admin qpair. When adding a new call to this function, please
     543             :  * verify that it is in a situation where it falls under the lock.
     544             :  */
     545             : static int
     546           0 : nvme_rdma_poll_events(struct nvme_rdma_ctrlr *rctrlr)
     547             : {
     548             :         struct nvme_rdma_cm_event_entry *entry, *tmp;
     549             :         struct nvme_rdma_qpair          *event_qpair;
     550           0 :         struct rdma_cm_event            *event;
     551           0 :         struct rdma_event_channel       *channel = rctrlr->cm_channel;
     552             : 
     553           0 :         STAILQ_FOREACH_SAFE(entry, &rctrlr->pending_cm_events, link, tmp) {
     554           0 :                 event_qpair = entry->evt->id->context;
     555           0 :                 if (event_qpair->evt == NULL) {
     556           0 :                         event_qpair->evt = entry->evt;
     557           0 :                         STAILQ_REMOVE(&rctrlr->pending_cm_events, entry, nvme_rdma_cm_event_entry, link);
     558           0 :                         STAILQ_INSERT_HEAD(&rctrlr->free_cm_events, entry, link);
     559             :                 }
     560             :         }
     561             : 
     562           0 :         while (rdma_get_cm_event(channel, &event) == 0) {
     563           0 :                 event_qpair = event->id->context;
     564           0 :                 if (event_qpair->evt == NULL) {
     565           0 :                         event_qpair->evt = event;
     566             :                 } else {
     567           0 :                         assert(rctrlr == nvme_rdma_ctrlr(event_qpair->qpair.ctrlr));
     568           0 :                         entry = STAILQ_FIRST(&rctrlr->free_cm_events);
     569           0 :                         if (entry == NULL) {
     570           0 :                                 rdma_ack_cm_event(event);
     571           0 :                                 return -ENOMEM;
     572             :                         }
     573           0 :                         STAILQ_REMOVE(&rctrlr->free_cm_events, entry, nvme_rdma_cm_event_entry, link);
     574           0 :                         entry->evt = event;
     575           0 :                         STAILQ_INSERT_TAIL(&rctrlr->pending_cm_events, entry, link);
     576             :                 }
     577             :         }
     578             : 
     579             :         /* rdma_get_cm_event() returns -1 on error. If an error occurs, errno
     580             :          * will be set to indicate the failure reason. So return negated errno here.
     581             :          */
     582           0 :         return -errno;
     583             : }
     584             : 
     585             : static int
     586           4 : nvme_rdma_validate_cm_event(enum rdma_cm_event_type expected_evt_type,
     587             :                             struct rdma_cm_event *reaped_evt)
     588             : {
     589           4 :         int rc = -EBADMSG;
     590             : 
     591           4 :         if (expected_evt_type == reaped_evt->event) {
     592           1 :                 return 0;
     593             :         }
     594             : 
     595           3 :         switch (expected_evt_type) {
     596           2 :         case RDMA_CM_EVENT_ESTABLISHED:
     597             :                 /*
     598             :                  * There is an enum ib_cm_rej_reason in the kernel headers that sets 10 as
     599             :                  * IB_CM_REJ_STALE_CONN. I can't find the corresponding userspace but we get
     600             :                  * the same values here.
     601             :                  */
     602           2 :                 if (reaped_evt->event == RDMA_CM_EVENT_REJECTED && reaped_evt->status == 10) {
     603           1 :                         rc = -ESTALE;
     604           1 :                 } else if (reaped_evt->event == RDMA_CM_EVENT_CONNECT_RESPONSE) {
     605             :                         /*
     606             :                          *  If we are using a qpair which is not created using rdma cm API
     607             :                          *  then we will receive RDMA_CM_EVENT_CONNECT_RESPONSE instead of
     608             :                          *  RDMA_CM_EVENT_ESTABLISHED.
     609             :                          */
     610           1 :                         return 0;
     611             :                 }
     612           1 :                 break;
     613           1 :         default:
     614           1 :                 break;
     615             :         }
     616             : 
     617           2 :         SPDK_ERRLOG("Expected %s but received %s (%d) from CM event channel (status = %d)\n",
     618             :                     nvme_rdma_cm_event_str_get(expected_evt_type),
     619             :                     nvme_rdma_cm_event_str_get(reaped_evt->event), reaped_evt->event,
     620             :                     reaped_evt->status);
     621           2 :         return rc;
     622             : }
     623             : 
     624             : static int
     625           0 : nvme_rdma_process_event_start(struct nvme_rdma_qpair *rqpair,
     626             :                               enum rdma_cm_event_type evt,
     627             :                               nvme_rdma_cm_event_cb evt_cb)
     628             : {
     629             :         int     rc;
     630             : 
     631           0 :         assert(evt_cb != NULL);
     632             : 
     633           0 :         if (rqpair->evt != NULL) {
     634           0 :                 rc = nvme_rdma_qpair_process_cm_event(rqpair);
     635           0 :                 if (rc) {
     636           0 :                         return rc;
     637             :                 }
     638             :         }
     639             : 
     640           0 :         rqpair->expected_evt_type = evt;
     641           0 :         rqpair->evt_cb = evt_cb;
     642           0 :         rqpair->evt_timeout_ticks = (NVME_RDMA_QPAIR_CM_EVENT_TIMEOUT_US * spdk_get_ticks_hz()) /
     643           0 :                                     SPDK_SEC_TO_USEC + spdk_get_ticks();
     644             : 
     645           0 :         return 0;
     646             : }
     647             : 
     648             : static int
     649           0 : nvme_rdma_process_event_poll(struct nvme_rdma_qpair *rqpair)
     650             : {
     651             :         struct nvme_rdma_ctrlr  *rctrlr;
     652           0 :         int     rc = 0, rc2;
     653             : 
     654           0 :         rctrlr = nvme_rdma_ctrlr(rqpair->qpair.ctrlr);
     655           0 :         assert(rctrlr != NULL);
     656             : 
     657           0 :         if (!rqpair->evt && spdk_get_ticks() < rqpair->evt_timeout_ticks) {
     658           0 :                 rc = nvme_rdma_poll_events(rctrlr);
     659           0 :                 if (rc == -EAGAIN || rc == -EWOULDBLOCK) {
     660           0 :                         return rc;
     661             :                 }
     662             :         }
     663             : 
     664           0 :         if (rqpair->evt == NULL) {
     665           0 :                 rc = -EADDRNOTAVAIL;
     666           0 :                 goto exit;
     667             :         }
     668             : 
     669           0 :         rc = nvme_rdma_validate_cm_event(rqpair->expected_evt_type, rqpair->evt);
     670             : 
     671           0 :         rc2 = nvme_rdma_qpair_process_cm_event(rqpair);
     672             :         /* bad message takes precedence over the other error codes from processing the event. */
     673           0 :         rc = rc == 0 ? rc2 : rc;
     674             : 
     675           0 : exit:
     676           0 :         assert(rqpair->evt_cb != NULL);
     677           0 :         return rqpair->evt_cb(rqpair, rc);
     678             : }
     679             : 
     680             : static int
     681           3 : nvme_rdma_resize_cq(struct nvme_rdma_qpair *rqpair, struct nvme_rdma_poller *poller)
     682             : {
     683             :         int     current_num_wc, required_num_wc;
     684             :         int     max_cq_size;
     685             : 
     686           3 :         required_num_wc = poller->required_num_wc + WC_PER_QPAIR(rqpair->num_entries);
     687           3 :         current_num_wc = poller->current_num_wc;
     688           3 :         if (current_num_wc < required_num_wc) {
     689           2 :                 current_num_wc = spdk_max(current_num_wc * 2, required_num_wc);
     690             :         }
     691             : 
     692           3 :         max_cq_size = g_spdk_nvme_transport_opts.rdma_max_cq_size;
     693           3 :         if (max_cq_size != 0 && current_num_wc > max_cq_size) {
     694           0 :                 current_num_wc = max_cq_size;
     695             :         }
     696             : 
     697           3 :         if (poller->current_num_wc != current_num_wc) {
     698           2 :                 SPDK_DEBUGLOG(nvme, "Resize RDMA CQ from %d to %d\n", poller->current_num_wc,
     699             :                               current_num_wc);
     700           2 :                 if (ibv_resize_cq(poller->cq, current_num_wc)) {
     701           1 :                         SPDK_ERRLOG("RDMA CQ resize failed: errno %d: %s\n", errno, spdk_strerror(errno));
     702           1 :                         return -1;
     703             :                 }
     704             : 
     705           1 :                 poller->current_num_wc = current_num_wc;
     706             :         }
     707             : 
     708           2 :         poller->required_num_wc = required_num_wc;
     709           2 :         return 0;
     710             : }
     711             : 
     712             : static int
     713           5 : nvme_rdma_qpair_set_poller(struct spdk_nvme_qpair *qpair)
     714             : {
     715           5 :         struct nvme_rdma_qpair          *rqpair = nvme_rdma_qpair(qpair);
     716           5 :         struct nvme_rdma_poll_group     *group = nvme_rdma_poll_group(qpair->poll_group);
     717             :         struct nvme_rdma_poller         *poller;
     718             : 
     719           5 :         assert(rqpair->cq == NULL);
     720             : 
     721           5 :         poller = nvme_rdma_poll_group_get_poller(group, rqpair->cm_id->verbs);
     722           5 :         if (!poller) {
     723           2 :                 SPDK_ERRLOG("Unable to find a cq for qpair %p on poll group %p\n", qpair, qpair->poll_group);
     724           2 :                 return -EINVAL;
     725             :         }
     726             : 
     727           3 :         if (!poller->srq) {
     728           3 :                 if (nvme_rdma_resize_cq(rqpair, poller)) {
     729           1 :                         nvme_rdma_poll_group_put_poller(group, poller);
     730           1 :                         return -EPROTO;
     731             :                 }
     732             :         }
     733             : 
     734           2 :         rqpair->cq = poller->cq;
     735           2 :         rqpair->srq = poller->srq;
     736           2 :         if (rqpair->srq) {
     737           0 :                 rqpair->rsps = poller->rsps;
     738             :         }
     739           2 :         rqpair->poller = poller;
     740           2 :         return 0;
     741             : }
     742             : 
     743             : static int
     744           1 : nvme_rdma_qpair_init(struct nvme_rdma_qpair *rqpair)
     745             : {
     746             :         int                     rc;
     747           1 :         struct spdk_rdma_qp_init_attr   attr = {};
     748           1 :         struct ibv_device_attr  dev_attr;
     749             :         struct nvme_rdma_ctrlr  *rctrlr;
     750             :         uint32_t num_cqe, max_num_cqe;
     751             : 
     752           1 :         rc = ibv_query_device(rqpair->cm_id->verbs, &dev_attr);
     753           1 :         if (rc != 0) {
     754           0 :                 SPDK_ERRLOG("Failed to query RDMA device attributes.\n");
     755           0 :                 return -1;
     756             :         }
     757             : 
     758           1 :         if (rqpair->qpair.poll_group) {
     759           0 :                 assert(!rqpair->cq);
     760           0 :                 rc = nvme_rdma_qpair_set_poller(&rqpair->qpair);
     761           0 :                 if (rc) {
     762           0 :                         SPDK_ERRLOG("Unable to activate the rdmaqpair.\n");
     763           0 :                         return -1;
     764             :                 }
     765           0 :                 assert(rqpair->cq);
     766             :         } else {
     767           1 :                 num_cqe = rqpair->num_entries * 2;
     768           1 :                 max_num_cqe = g_spdk_nvme_transport_opts.rdma_max_cq_size;
     769           1 :                 if (max_num_cqe != 0 && num_cqe > max_num_cqe) {
     770           0 :                         num_cqe = max_num_cqe;
     771             :                 }
     772           1 :                 rqpair->cq = ibv_create_cq(rqpair->cm_id->verbs, num_cqe, rqpair, NULL, 0);
     773           1 :                 if (!rqpair->cq) {
     774           0 :                         SPDK_ERRLOG("Unable to create completion queue: errno %d: %s\n", errno, spdk_strerror(errno));
     775           0 :                         return -1;
     776             :                 }
     777             :         }
     778             : 
     779           1 :         rctrlr = nvme_rdma_ctrlr(rqpair->qpair.ctrlr);
     780           1 :         if (g_nvme_hooks.get_ibv_pd) {
     781           0 :                 attr.pd = g_nvme_hooks.get_ibv_pd(&rctrlr->ctrlr.trid, rqpair->cm_id->verbs);
     782             :         } else {
     783           1 :                 attr.pd = spdk_rdma_get_pd(rqpair->cm_id->verbs);
     784             :         }
     785             : 
     786           1 :         attr.stats =            rqpair->poller ? &rqpair->poller->stats.rdma_stats : NULL;
     787           1 :         attr.send_cq            = rqpair->cq;
     788           1 :         attr.recv_cq            = rqpair->cq;
     789           1 :         attr.cap.max_send_wr    = rqpair->num_entries; /* SEND operations */
     790           1 :         if (rqpair->srq) {
     791           0 :                 attr.srq        = rqpair->srq->srq;
     792             :         } else {
     793           1 :                 attr.cap.max_recv_wr = rqpair->num_entries; /* RECV operations */
     794             :         }
     795           1 :         attr.cap.max_send_sge   = spdk_min(NVME_RDMA_DEFAULT_TX_SGE, dev_attr.max_sge);
     796           1 :         attr.cap.max_recv_sge   = spdk_min(NVME_RDMA_DEFAULT_RX_SGE, dev_attr.max_sge);
     797             : 
     798           1 :         rqpair->rdma_qp = spdk_rdma_qp_create(rqpair->cm_id, &attr);
     799             : 
     800           1 :         if (!rqpair->rdma_qp) {
     801           0 :                 return -1;
     802             :         }
     803             : 
     804           1 :         rqpair->memory_domain = nvme_rdma_get_memory_domain(rqpair->rdma_qp->qp->pd);
     805           1 :         if (!rqpair->memory_domain) {
     806           0 :                 SPDK_ERRLOG("Failed to get memory domain\n");
     807           0 :                 return -1;
     808             :         }
     809             : 
     810             :         /* ibv_create_qp will change the values in attr.cap. Make sure we store the proper value. */
     811           1 :         rqpair->max_send_sge = spdk_min(NVME_RDMA_DEFAULT_TX_SGE, attr.cap.max_send_sge);
     812           1 :         rqpair->max_recv_sge = spdk_min(NVME_RDMA_DEFAULT_RX_SGE, attr.cap.max_recv_sge);
     813           1 :         rqpair->current_num_sends = 0;
     814             : 
     815           1 :         rqpair->cm_id->context = rqpair;
     816             : 
     817           1 :         return 0;
     818             : }
     819             : 
     820             : static void
     821           0 : nvme_rdma_reset_failed_sends(struct nvme_rdma_qpair *rqpair,
     822             :                              struct ibv_send_wr *bad_send_wr, int rc)
     823             : {
     824           0 :         SPDK_ERRLOG("Failed to post WRs on send queue, errno %d (%s), bad_wr %p\n",
     825             :                     rc, spdk_strerror(rc), bad_send_wr);
     826           0 :         while (bad_send_wr != NULL) {
     827           0 :                 assert(rqpair->current_num_sends > 0);
     828           0 :                 rqpair->current_num_sends--;
     829           0 :                 bad_send_wr = bad_send_wr->next;
     830             :         }
     831           0 : }
     832             : 
     833             : static void
     834           0 : nvme_rdma_reset_failed_recvs(struct nvme_rdma_rsps *rsps,
     835             :                              struct ibv_recv_wr *bad_recv_wr, int rc)
     836             : {
     837           0 :         SPDK_ERRLOG("Failed to post WRs on receive queue, errno %d (%s), bad_wr %p\n",
     838             :                     rc, spdk_strerror(rc), bad_recv_wr);
     839           0 :         while (bad_recv_wr != NULL) {
     840           0 :                 assert(rsps->current_num_recvs > 0);
     841           0 :                 rsps->current_num_recvs--;
     842           0 :                 bad_recv_wr = bad_recv_wr->next;
     843             :         }
     844           0 : }
     845             : 
     846             : static inline int
     847           1 : nvme_rdma_qpair_submit_sends(struct nvme_rdma_qpair *rqpair)
     848             : {
     849           1 :         struct ibv_send_wr *bad_send_wr = NULL;
     850             :         int rc;
     851             : 
     852           1 :         rc = spdk_rdma_qp_flush_send_wrs(rqpair->rdma_qp, &bad_send_wr);
     853             : 
     854           1 :         if (spdk_unlikely(rc)) {
     855           0 :                 nvme_rdma_reset_failed_sends(rqpair, bad_send_wr, rc);
     856             :         }
     857             : 
     858           1 :         return rc;
     859             : }
     860             : 
     861             : static inline int
     862           0 : nvme_rdma_qpair_submit_recvs(struct nvme_rdma_qpair *rqpair)
     863             : {
     864           0 :         struct ibv_recv_wr *bad_recv_wr;
     865           0 :         int rc = 0;
     866             : 
     867           0 :         rc = spdk_rdma_qp_flush_recv_wrs(rqpair->rdma_qp, &bad_recv_wr);
     868           0 :         if (spdk_unlikely(rc)) {
     869           0 :                 nvme_rdma_reset_failed_recvs(rqpair->rsps, bad_recv_wr, rc);
     870             :         }
     871             : 
     872           0 :         return rc;
     873             : }
     874             : 
     875             : static inline int
     876           0 : nvme_rdma_poller_submit_recvs(struct nvme_rdma_poller *poller)
     877             : {
     878           0 :         struct ibv_recv_wr *bad_recv_wr;
     879             :         int rc;
     880             : 
     881           0 :         rc = spdk_rdma_srq_flush_recv_wrs(poller->srq, &bad_recv_wr);
     882           0 :         if (spdk_unlikely(rc)) {
     883           0 :                 nvme_rdma_reset_failed_recvs(poller->rsps, bad_recv_wr, rc);
     884             :         }
     885             : 
     886           0 :         return rc;
     887             : }
     888             : 
     889             : #define nvme_rdma_trace_ibv_sge(sg_list) \
     890             :         if (sg_list) { \
     891             :                 SPDK_DEBUGLOG(nvme, "local addr %p length 0x%x lkey 0x%x\n", \
     892             :                               (void *)(sg_list)->addr, (sg_list)->length, (sg_list)->lkey); \
     893             :         }
     894             : 
     895             : static void
     896           3 : nvme_rdma_free_rsps(struct nvme_rdma_rsps *rsps)
     897             : {
     898           3 :         if (!rsps) {
     899           1 :                 return;
     900             :         }
     901             : 
     902           2 :         spdk_free(rsps->rsps);
     903           2 :         spdk_free(rsps->rsp_sgls);
     904           2 :         spdk_free(rsps->rsp_recv_wrs);
     905           2 :         spdk_free(rsps);
     906             : }
     907             : 
     908             : static struct nvme_rdma_rsps *
     909           2 : nvme_rdma_create_rsps(struct nvme_rdma_rsp_opts *opts)
     910             : {
     911             :         struct nvme_rdma_rsps *rsps;
     912           2 :         struct spdk_rdma_memory_translation translation;
     913             :         uint16_t i;
     914             :         int rc;
     915             : 
     916           2 :         rsps = spdk_zmalloc(sizeof(*rsps), 0, NULL, SPDK_ENV_SOCKET_ID_ANY, SPDK_MALLOC_DMA);
     917           2 :         if (!rsps) {
     918           0 :                 SPDK_ERRLOG("Failed to allocate rsps object\n");
     919           0 :                 return NULL;
     920             :         }
     921             : 
     922           2 :         rsps->rsp_sgls = spdk_zmalloc(opts->num_entries * sizeof(*rsps->rsp_sgls), 0, NULL,
     923             :                                       SPDK_ENV_SOCKET_ID_ANY, SPDK_MALLOC_DMA);
     924           2 :         if (!rsps->rsp_sgls) {
     925           1 :                 SPDK_ERRLOG("Failed to allocate rsp_sgls\n");
     926           1 :                 goto fail;
     927             :         }
     928             : 
     929           1 :         rsps->rsp_recv_wrs = spdk_zmalloc(opts->num_entries * sizeof(*rsps->rsp_recv_wrs), 0, NULL,
     930             :                                           SPDK_ENV_SOCKET_ID_ANY, SPDK_MALLOC_DMA);
     931           1 :         if (!rsps->rsp_recv_wrs) {
     932           0 :                 SPDK_ERRLOG("Failed to allocate rsp_recv_wrs\n");
     933           0 :                 goto fail;
     934             :         }
     935             : 
     936           1 :         rsps->rsps = spdk_zmalloc(opts->num_entries * sizeof(*rsps->rsps), 0, NULL,
     937             :                                   SPDK_ENV_SOCKET_ID_ANY, SPDK_MALLOC_DMA);
     938           1 :         if (!rsps->rsps) {
     939           0 :                 SPDK_ERRLOG("can not allocate rdma rsps\n");
     940           0 :                 goto fail;
     941             :         }
     942             : 
     943           2 :         for (i = 0; i < opts->num_entries; i++) {
     944           1 :                 struct ibv_sge *rsp_sgl = &rsps->rsp_sgls[i];
     945           1 :                 struct spdk_nvme_rdma_rsp *rsp = &rsps->rsps[i];
     946           1 :                 struct ibv_recv_wr *recv_wr = &rsps->rsp_recv_wrs[i];
     947             : 
     948           1 :                 rsp->rqpair = opts->rqpair;
     949           1 :                 rsp->rdma_wr.type = RDMA_WR_TYPE_RECV;
     950           1 :                 rsp->recv_wr = recv_wr;
     951           1 :                 rsp_sgl->addr = (uint64_t)rsp;
     952           1 :                 rsp_sgl->length = sizeof(struct spdk_nvme_cpl);
     953           1 :                 rc = spdk_rdma_get_translation(opts->mr_map, rsp, sizeof(*rsp), &translation);
     954           1 :                 if (rc) {
     955           0 :                         goto fail;
     956             :                 }
     957           1 :                 rsp_sgl->lkey = spdk_rdma_memory_translation_get_lkey(&translation);
     958             : 
     959           1 :                 recv_wr->wr_id = (uint64_t)&rsp->rdma_wr;
     960           1 :                 recv_wr->next = NULL;
     961           1 :                 recv_wr->sg_list = rsp_sgl;
     962           1 :                 recv_wr->num_sge = 1;
     963             : 
     964           1 :                 nvme_rdma_trace_ibv_sge(recv_wr->sg_list);
     965             : 
     966           1 :                 if (opts->rqpair) {
     967           1 :                         spdk_rdma_qp_queue_recv_wrs(opts->rqpair->rdma_qp, recv_wr);
     968             :                 } else {
     969           0 :                         spdk_rdma_srq_queue_recv_wrs(opts->srq, recv_wr);
     970             :                 }
     971             :         }
     972             : 
     973           1 :         rsps->num_entries = opts->num_entries;
     974           1 :         rsps->current_num_recvs = opts->num_entries;
     975             : 
     976           1 :         return rsps;
     977           1 : fail:
     978           1 :         nvme_rdma_free_rsps(rsps);
     979           1 :         return NULL;
     980             : }
     981             : 
     982             : static void
     983           3 : nvme_rdma_free_reqs(struct nvme_rdma_qpair *rqpair)
     984             : {
     985           3 :         if (!rqpair->rdma_reqs) {
     986           2 :                 return;
     987             :         }
     988             : 
     989           1 :         spdk_free(rqpair->cmds);
     990           1 :         rqpair->cmds = NULL;
     991             : 
     992           1 :         spdk_free(rqpair->rdma_reqs);
     993           1 :         rqpair->rdma_reqs = NULL;
     994             : }
     995             : 
     996             : static int
     997           4 : nvme_rdma_create_reqs(struct nvme_rdma_qpair *rqpair)
     998             : {
     999           4 :         struct spdk_rdma_memory_translation translation;
    1000             :         uint16_t i;
    1001             :         int rc;
    1002             : 
    1003           4 :         assert(!rqpair->rdma_reqs);
    1004           4 :         rqpair->rdma_reqs = spdk_zmalloc(rqpair->num_entries * sizeof(struct spdk_nvme_rdma_req), 0, NULL,
    1005             :                                          SPDK_ENV_SOCKET_ID_ANY, SPDK_MALLOC_DMA);
    1006           4 :         if (rqpair->rdma_reqs == NULL) {
    1007           1 :                 SPDK_ERRLOG("Failed to allocate rdma_reqs\n");
    1008           1 :                 goto fail;
    1009             :         }
    1010             : 
    1011           3 :         assert(!rqpair->cmds);
    1012           3 :         rqpair->cmds = spdk_zmalloc(rqpair->num_entries * sizeof(*rqpair->cmds), 0, NULL,
    1013             :                                     SPDK_ENV_SOCKET_ID_ANY, SPDK_MALLOC_DMA);
    1014           3 :         if (!rqpair->cmds) {
    1015           0 :                 SPDK_ERRLOG("Failed to allocate RDMA cmds\n");
    1016           0 :                 goto fail;
    1017             :         }
    1018             : 
    1019           3 :         TAILQ_INIT(&rqpair->free_reqs);
    1020           3 :         TAILQ_INIT(&rqpair->outstanding_reqs);
    1021          10 :         for (i = 0; i < rqpair->num_entries; i++) {
    1022             :                 struct spdk_nvme_rdma_req       *rdma_req;
    1023             :                 struct spdk_nvmf_cmd            *cmd;
    1024             : 
    1025           7 :                 rdma_req = &rqpair->rdma_reqs[i];
    1026           7 :                 rdma_req->rdma_wr.type = RDMA_WR_TYPE_SEND;
    1027           7 :                 cmd = &rqpair->cmds[i];
    1028             : 
    1029           7 :                 rdma_req->id = i;
    1030             : 
    1031           7 :                 rc = spdk_rdma_get_translation(rqpair->mr_map, cmd, sizeof(*cmd), &translation);
    1032           7 :                 if (rc) {
    1033           0 :                         goto fail;
    1034             :                 }
    1035           7 :                 rdma_req->send_sgl[0].lkey = spdk_rdma_memory_translation_get_lkey(&translation);
    1036             : 
    1037             :                 /* The first RDMA sgl element will always point
    1038             :                  * at this data structure. Depending on whether
    1039             :                  * an NVMe-oF SGL is required, the length of
    1040             :                  * this element may change. */
    1041           7 :                 rdma_req->send_sgl[0].addr = (uint64_t)cmd;
    1042           7 :                 rdma_req->send_wr.wr_id = (uint64_t)&rdma_req->rdma_wr;
    1043           7 :                 rdma_req->send_wr.next = NULL;
    1044           7 :                 rdma_req->send_wr.opcode = IBV_WR_SEND;
    1045           7 :                 rdma_req->send_wr.send_flags = IBV_SEND_SIGNALED;
    1046           7 :                 rdma_req->send_wr.sg_list = rdma_req->send_sgl;
    1047           7 :                 rdma_req->send_wr.imm_data = 0;
    1048             : 
    1049           7 :                 TAILQ_INSERT_TAIL(&rqpair->free_reqs, rdma_req, link);
    1050             :         }
    1051             : 
    1052           3 :         return 0;
    1053           1 : fail:
    1054           1 :         nvme_rdma_free_reqs(rqpair);
    1055           1 :         return -ENOMEM;
    1056             : }
    1057             : 
    1058             : static int nvme_rdma_connect(struct nvme_rdma_qpair *rqpair);
    1059             : 
    1060             : static int
    1061           0 : nvme_rdma_route_resolved(struct nvme_rdma_qpair *rqpair, int ret)
    1062             : {
    1063           0 :         if (ret) {
    1064           0 :                 SPDK_ERRLOG("RDMA route resolution error\n");
    1065           0 :                 return -1;
    1066             :         }
    1067             : 
    1068           0 :         ret = nvme_rdma_qpair_init(rqpair);
    1069           0 :         if (ret < 0) {
    1070           0 :                 SPDK_ERRLOG("nvme_rdma_qpair_init() failed\n");
    1071           0 :                 return -1;
    1072             :         }
    1073             : 
    1074           0 :         return nvme_rdma_connect(rqpair);
    1075             : }
    1076             : 
    1077             : static int
    1078           0 : nvme_rdma_addr_resolved(struct nvme_rdma_qpair *rqpair, int ret)
    1079             : {
    1080           0 :         if (ret) {
    1081           0 :                 SPDK_ERRLOG("RDMA address resolution error\n");
    1082           0 :                 return -1;
    1083             :         }
    1084             : 
    1085           0 :         if (rqpair->qpair.ctrlr->opts.transport_ack_timeout != SPDK_NVME_TRANSPORT_ACK_TIMEOUT_DISABLED) {
    1086             : #ifdef SPDK_CONFIG_RDMA_SET_ACK_TIMEOUT
    1087             :                 uint8_t timeout = rqpair->qpair.ctrlr->opts.transport_ack_timeout;
    1088             :                 ret = rdma_set_option(rqpair->cm_id, RDMA_OPTION_ID,
    1089             :                                       RDMA_OPTION_ID_ACK_TIMEOUT,
    1090             :                                       &timeout, sizeof(timeout));
    1091             :                 if (ret) {
    1092             :                         SPDK_NOTICELOG("Can't apply RDMA_OPTION_ID_ACK_TIMEOUT %d, ret %d\n", timeout, ret);
    1093             :                 }
    1094             : #else
    1095           0 :                 SPDK_DEBUGLOG(nvme, "transport_ack_timeout is not supported\n");
    1096             : #endif
    1097             :         }
    1098             : 
    1099           0 :         if (rqpair->qpair.ctrlr->opts.transport_tos != SPDK_NVME_TRANSPORT_TOS_DISABLED) {
    1100             : #ifdef SPDK_CONFIG_RDMA_SET_TOS
    1101           0 :                 uint8_t tos = rqpair->qpair.ctrlr->opts.transport_tos;
    1102           0 :                 ret = rdma_set_option(rqpair->cm_id, RDMA_OPTION_ID, RDMA_OPTION_ID_TOS, &tos, sizeof(tos));
    1103           0 :                 if (ret) {
    1104           0 :                         SPDK_NOTICELOG("Can't apply RDMA_OPTION_ID_TOS %u, ret %d\n", tos, ret);
    1105             :                 }
    1106             : #else
    1107             :                 SPDK_DEBUGLOG(nvme, "transport_tos is not supported\n");
    1108             : #endif
    1109             :         }
    1110             : 
    1111           0 :         ret = rdma_resolve_route(rqpair->cm_id, NVME_RDMA_TIME_OUT_IN_MS);
    1112           0 :         if (ret) {
    1113           0 :                 SPDK_ERRLOG("rdma_resolve_route\n");
    1114           0 :                 return ret;
    1115             :         }
    1116             : 
    1117           0 :         return nvme_rdma_process_event_start(rqpair, RDMA_CM_EVENT_ROUTE_RESOLVED,
    1118             :                                              nvme_rdma_route_resolved);
    1119             : }
    1120             : 
    1121             : static int
    1122           0 : nvme_rdma_resolve_addr(struct nvme_rdma_qpair *rqpair,
    1123             :                        struct sockaddr *src_addr,
    1124             :                        struct sockaddr *dst_addr)
    1125             : {
    1126             :         int ret;
    1127             : 
    1128           0 :         if (src_addr) {
    1129           0 :                 int reuse = 1;
    1130             : 
    1131           0 :                 ret = rdma_set_option(rqpair->cm_id, RDMA_OPTION_ID, RDMA_OPTION_ID_REUSEADDR,
    1132             :                                       &reuse, sizeof(reuse));
    1133           0 :                 if (ret) {
    1134           0 :                         SPDK_NOTICELOG("Can't apply RDMA_OPTION_ID_REUSEADDR %d, ret %d\n",
    1135             :                                        reuse, ret);
    1136             :                         /* It is likely that rdma_resolve_addr() returns -EADDRINUSE, but
    1137             :                          * we may missing something. We rely on rdma_resolve_addr().
    1138             :                          */
    1139             :                 }
    1140             :         }
    1141             : 
    1142           0 :         ret = rdma_resolve_addr(rqpair->cm_id, src_addr, dst_addr,
    1143             :                                 NVME_RDMA_TIME_OUT_IN_MS);
    1144           0 :         if (ret) {
    1145           0 :                 SPDK_ERRLOG("rdma_resolve_addr, %d\n", errno);
    1146           0 :                 return ret;
    1147             :         }
    1148             : 
    1149           0 :         return nvme_rdma_process_event_start(rqpair, RDMA_CM_EVENT_ADDR_RESOLVED,
    1150             :                                              nvme_rdma_addr_resolved);
    1151             : }
    1152             : 
    1153             : static int nvme_rdma_stale_conn_retry(struct nvme_rdma_qpair *rqpair);
    1154             : 
    1155             : static int
    1156           0 : nvme_rdma_connect_established(struct nvme_rdma_qpair *rqpair, int ret)
    1157             : {
    1158           0 :         struct nvme_rdma_rsp_opts opts = {};
    1159             : 
    1160           0 :         if (ret == -ESTALE) {
    1161           0 :                 return nvme_rdma_stale_conn_retry(rqpair);
    1162           0 :         } else if (ret) {
    1163           0 :                 SPDK_ERRLOG("RDMA connect error %d\n", ret);
    1164           0 :                 return ret;
    1165             :         }
    1166             : 
    1167           0 :         assert(!rqpair->mr_map);
    1168           0 :         rqpair->mr_map = spdk_rdma_create_mem_map(rqpair->rdma_qp->qp->pd, &g_nvme_hooks,
    1169             :                          SPDK_RDMA_MEMORY_MAP_ROLE_INITIATOR);
    1170           0 :         if (!rqpair->mr_map) {
    1171           0 :                 SPDK_ERRLOG("Unable to register RDMA memory translation map\n");
    1172           0 :                 return -1;
    1173             :         }
    1174             : 
    1175           0 :         ret = nvme_rdma_create_reqs(rqpair);
    1176           0 :         SPDK_DEBUGLOG(nvme, "rc =%d\n", ret);
    1177           0 :         if (ret) {
    1178           0 :                 SPDK_ERRLOG("Unable to create rqpair RDMA requests\n");
    1179           0 :                 return -1;
    1180             :         }
    1181           0 :         SPDK_DEBUGLOG(nvme, "RDMA requests created\n");
    1182             : 
    1183           0 :         if (!rqpair->srq) {
    1184           0 :                 opts.num_entries = rqpair->num_entries;
    1185           0 :                 opts.rqpair = rqpair;
    1186           0 :                 opts.srq = NULL;
    1187           0 :                 opts.mr_map = rqpair->mr_map;
    1188             : 
    1189           0 :                 assert(!rqpair->rsps);
    1190           0 :                 rqpair->rsps = nvme_rdma_create_rsps(&opts);
    1191           0 :                 if (!rqpair->rsps) {
    1192           0 :                         SPDK_ERRLOG("Unable to create rqpair RDMA responses\n");
    1193           0 :                         return -1;
    1194             :                 }
    1195           0 :                 SPDK_DEBUGLOG(nvme, "RDMA responses created\n");
    1196             : 
    1197           0 :                 ret = nvme_rdma_qpair_submit_recvs(rqpair);
    1198           0 :                 SPDK_DEBUGLOG(nvme, "rc =%d\n", ret);
    1199           0 :                 if (ret) {
    1200           0 :                         SPDK_ERRLOG("Unable to submit rqpair RDMA responses\n");
    1201           0 :                         return -1;
    1202             :                 }
    1203           0 :                 SPDK_DEBUGLOG(nvme, "RDMA responses submitted\n");
    1204             :         }
    1205             : 
    1206           0 :         rqpair->state = NVME_RDMA_QPAIR_STATE_FABRIC_CONNECT_SEND;
    1207             : 
    1208           0 :         return 0;
    1209             : }
    1210             : 
    1211             : static int
    1212           0 : nvme_rdma_connect(struct nvme_rdma_qpair *rqpair)
    1213             : {
    1214           0 :         struct rdma_conn_param                          param = {};
    1215           0 :         struct spdk_nvmf_rdma_request_private_data      request_data = {};
    1216           0 :         struct ibv_device_attr                          attr;
    1217             :         int                                             ret;
    1218             :         struct spdk_nvme_ctrlr                          *ctrlr;
    1219             : 
    1220           0 :         ret = ibv_query_device(rqpair->cm_id->verbs, &attr);
    1221           0 :         if (ret != 0) {
    1222           0 :                 SPDK_ERRLOG("Failed to query RDMA device attributes.\n");
    1223           0 :                 return ret;
    1224             :         }
    1225             : 
    1226           0 :         param.responder_resources = attr.max_qp_rd_atom;
    1227             : 
    1228           0 :         ctrlr = rqpair->qpair.ctrlr;
    1229           0 :         if (!ctrlr) {
    1230           0 :                 return -1;
    1231             :         }
    1232             : 
    1233           0 :         request_data.qid = rqpair->qpair.id;
    1234           0 :         request_data.hrqsize = rqpair->num_entries + 1;
    1235           0 :         request_data.hsqsize = rqpair->num_entries;
    1236           0 :         request_data.cntlid = ctrlr->cntlid;
    1237             : 
    1238           0 :         param.private_data = &request_data;
    1239           0 :         param.private_data_len = sizeof(request_data);
    1240           0 :         param.retry_count = ctrlr->opts.transport_retry_count;
    1241           0 :         param.rnr_retry_count = 7;
    1242             : 
    1243             :         /* Fields below are ignored by rdma cm if qpair has been
    1244             :          * created using rdma cm API. */
    1245           0 :         param.srq = 0;
    1246           0 :         param.qp_num = rqpair->rdma_qp->qp->qp_num;
    1247             : 
    1248           0 :         ret = rdma_connect(rqpair->cm_id, &param);
    1249           0 :         if (ret) {
    1250           0 :                 SPDK_ERRLOG("nvme rdma connect error\n");
    1251           0 :                 return ret;
    1252             :         }
    1253             : 
    1254           0 :         return nvme_rdma_process_event_start(rqpair, RDMA_CM_EVENT_ESTABLISHED,
    1255             :                                              nvme_rdma_connect_established);
    1256             : }
    1257             : 
    1258             : static int
    1259           0 : nvme_rdma_ctrlr_connect_qpair(struct spdk_nvme_ctrlr *ctrlr, struct spdk_nvme_qpair *qpair)
    1260             : {
    1261           0 :         struct sockaddr_storage dst_addr;
    1262           0 :         struct sockaddr_storage src_addr;
    1263             :         bool src_addr_specified;
    1264           0 :         long int port, src_port;
    1265             :         int rc;
    1266             :         struct nvme_rdma_ctrlr *rctrlr;
    1267             :         struct nvme_rdma_qpair *rqpair;
    1268             :         struct nvme_rdma_poll_group *group;
    1269             :         int family;
    1270             : 
    1271           0 :         rqpair = nvme_rdma_qpair(qpair);
    1272           0 :         rctrlr = nvme_rdma_ctrlr(ctrlr);
    1273           0 :         assert(rctrlr != NULL);
    1274             : 
    1275           0 :         switch (ctrlr->trid.adrfam) {
    1276           0 :         case SPDK_NVMF_ADRFAM_IPV4:
    1277           0 :                 family = AF_INET;
    1278           0 :                 break;
    1279           0 :         case SPDK_NVMF_ADRFAM_IPV6:
    1280           0 :                 family = AF_INET6;
    1281           0 :                 break;
    1282           0 :         default:
    1283           0 :                 SPDK_ERRLOG("Unhandled ADRFAM %d\n", ctrlr->trid.adrfam);
    1284           0 :                 return -1;
    1285             :         }
    1286             : 
    1287           0 :         SPDK_DEBUGLOG(nvme, "adrfam %d ai_family %d\n", ctrlr->trid.adrfam, family);
    1288             : 
    1289           0 :         memset(&dst_addr, 0, sizeof(dst_addr));
    1290             : 
    1291           0 :         SPDK_DEBUGLOG(nvme, "trsvcid is %s\n", ctrlr->trid.trsvcid);
    1292           0 :         rc = nvme_parse_addr(&dst_addr, family, ctrlr->trid.traddr, ctrlr->trid.trsvcid, &port);
    1293           0 :         if (rc != 0) {
    1294           0 :                 SPDK_ERRLOG("dst_addr nvme_parse_addr() failed\n");
    1295           0 :                 return -1;
    1296             :         }
    1297             : 
    1298           0 :         if (ctrlr->opts.src_addr[0] || ctrlr->opts.src_svcid[0]) {
    1299           0 :                 memset(&src_addr, 0, sizeof(src_addr));
    1300           0 :                 rc = nvme_parse_addr(&src_addr, family, ctrlr->opts.src_addr, ctrlr->opts.src_svcid, &src_port);
    1301           0 :                 if (rc != 0) {
    1302           0 :                         SPDK_ERRLOG("src_addr nvme_parse_addr() failed\n");
    1303           0 :                         return -1;
    1304             :                 }
    1305           0 :                 src_addr_specified = true;
    1306             :         } else {
    1307           0 :                 src_addr_specified = false;
    1308             :         }
    1309             : 
    1310           0 :         rc = rdma_create_id(rctrlr->cm_channel, &rqpair->cm_id, rqpair, RDMA_PS_TCP);
    1311           0 :         if (rc < 0) {
    1312           0 :                 SPDK_ERRLOG("rdma_create_id() failed\n");
    1313           0 :                 return -1;
    1314             :         }
    1315             : 
    1316           0 :         rc = nvme_rdma_resolve_addr(rqpair,
    1317             :                                     src_addr_specified ? (struct sockaddr *)&src_addr : NULL,
    1318             :                                     (struct sockaddr *)&dst_addr);
    1319           0 :         if (rc < 0) {
    1320           0 :                 SPDK_ERRLOG("nvme_rdma_resolve_addr() failed\n");
    1321           0 :                 return -1;
    1322             :         }
    1323             : 
    1324           0 :         rqpair->state = NVME_RDMA_QPAIR_STATE_INITIALIZING;
    1325             : 
    1326           0 :         if (qpair->poll_group != NULL) {
    1327           0 :                 group = nvme_rdma_poll_group(qpair->poll_group);
    1328           0 :                 TAILQ_INSERT_TAIL(&group->connecting_qpairs, rqpair, link_connecting);
    1329             :         }
    1330             : 
    1331           0 :         return 0;
    1332             : }
    1333             : 
    1334             : static int
    1335           0 : nvme_rdma_stale_conn_reconnect(struct nvme_rdma_qpair *rqpair)
    1336             : {
    1337           0 :         struct spdk_nvme_qpair *qpair = &rqpair->qpair;
    1338             : 
    1339           0 :         if (spdk_get_ticks() < rqpair->evt_timeout_ticks) {
    1340           0 :                 return -EAGAIN;
    1341             :         }
    1342             : 
    1343           0 :         return nvme_rdma_ctrlr_connect_qpair(qpair->ctrlr, qpair);
    1344             : }
    1345             : 
    1346             : static int
    1347           0 : nvme_rdma_ctrlr_connect_qpair_poll(struct spdk_nvme_ctrlr *ctrlr,
    1348             :                                    struct spdk_nvme_qpair *qpair)
    1349             : {
    1350           0 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    1351             :         int rc;
    1352             : 
    1353           0 :         if (rqpair->in_connect_poll) {
    1354           0 :                 return -EAGAIN;
    1355             :         }
    1356             : 
    1357           0 :         rqpair->in_connect_poll = true;
    1358             : 
    1359           0 :         switch (rqpair->state) {
    1360           0 :         case NVME_RDMA_QPAIR_STATE_INVALID:
    1361           0 :                 rc = -EAGAIN;
    1362           0 :                 break;
    1363             : 
    1364           0 :         case NVME_RDMA_QPAIR_STATE_INITIALIZING:
    1365             :         case NVME_RDMA_QPAIR_STATE_EXITING:
    1366           0 :                 if (!nvme_qpair_is_admin_queue(qpair)) {
    1367           0 :                         nvme_ctrlr_lock(ctrlr);
    1368             :                 }
    1369             : 
    1370           0 :                 rc = nvme_rdma_process_event_poll(rqpair);
    1371             : 
    1372           0 :                 if (!nvme_qpair_is_admin_queue(qpair)) {
    1373           0 :                         nvme_ctrlr_unlock(ctrlr);
    1374             :                 }
    1375             : 
    1376           0 :                 if (rc == 0) {
    1377           0 :                         rc = -EAGAIN;
    1378             :                 }
    1379           0 :                 rqpair->in_connect_poll = false;
    1380             : 
    1381           0 :                 return rc;
    1382             : 
    1383           0 :         case NVME_RDMA_QPAIR_STATE_STALE_CONN:
    1384           0 :                 rc = nvme_rdma_stale_conn_reconnect(rqpair);
    1385           0 :                 if (rc == 0) {
    1386           0 :                         rc = -EAGAIN;
    1387             :                 }
    1388           0 :                 break;
    1389           0 :         case NVME_RDMA_QPAIR_STATE_FABRIC_CONNECT_SEND:
    1390           0 :                 rc = nvme_fabric_qpair_connect_async(qpair, rqpair->num_entries + 1);
    1391           0 :                 if (rc == 0) {
    1392           0 :                         rqpair->state = NVME_RDMA_QPAIR_STATE_FABRIC_CONNECT_POLL;
    1393           0 :                         rc = -EAGAIN;
    1394             :                 } else {
    1395           0 :                         SPDK_ERRLOG("Failed to send an NVMe-oF Fabric CONNECT command\n");
    1396             :                 }
    1397           0 :                 break;
    1398           0 :         case NVME_RDMA_QPAIR_STATE_FABRIC_CONNECT_POLL:
    1399           0 :                 rc = nvme_fabric_qpair_connect_poll(qpair);
    1400           0 :                 if (rc == 0) {
    1401           0 :                         rqpair->state = NVME_RDMA_QPAIR_STATE_RUNNING;
    1402           0 :                         nvme_qpair_set_state(qpair, NVME_QPAIR_CONNECTED);
    1403           0 :                 } else if (rc != -EAGAIN) {
    1404           0 :                         SPDK_ERRLOG("Failed to poll NVMe-oF Fabric CONNECT command\n");
    1405             :                 }
    1406           0 :                 break;
    1407           0 :         case NVME_RDMA_QPAIR_STATE_RUNNING:
    1408           0 :                 rc = 0;
    1409           0 :                 break;
    1410           0 :         default:
    1411           0 :                 assert(false);
    1412             :                 rc = -EINVAL;
    1413             :                 break;
    1414             :         }
    1415             : 
    1416           0 :         rqpair->in_connect_poll = false;
    1417             : 
    1418           0 :         return rc;
    1419             : }
    1420             : 
    1421             : static inline int
    1422          28 : nvme_rdma_get_memory_translation(struct nvme_request *req, struct nvme_rdma_qpair *rqpair,
    1423             :                                  struct nvme_rdma_memory_translation_ctx *_ctx)
    1424             : {
    1425          28 :         struct spdk_memory_domain_translation_ctx ctx;
    1426          28 :         struct spdk_memory_domain_translation_result dma_translation = {.iov_count = 0};
    1427          28 :         struct spdk_rdma_memory_translation rdma_translation;
    1428             :         int rc;
    1429             : 
    1430          28 :         assert(req);
    1431          28 :         assert(rqpair);
    1432          28 :         assert(_ctx);
    1433             : 
    1434          28 :         if (req->payload.opts && req->payload.opts->memory_domain) {
    1435           2 :                 ctx.size = sizeof(struct spdk_memory_domain_translation_ctx);
    1436           2 :                 ctx.rdma.ibv_qp = rqpair->rdma_qp->qp;
    1437           2 :                 dma_translation.size = sizeof(struct spdk_memory_domain_translation_result);
    1438             : 
    1439           2 :                 rc = spdk_memory_domain_translate_data(req->payload.opts->memory_domain,
    1440           2 :                                                        req->payload.opts->memory_domain_ctx,
    1441           2 :                                                        rqpair->memory_domain->domain, &ctx, _ctx->addr,
    1442             :                                                        _ctx->length, &dma_translation);
    1443           2 :                 if (spdk_unlikely(rc) || dma_translation.iov_count != 1) {
    1444           1 :                         SPDK_ERRLOG("DMA memory translation failed, rc %d, iov count %u\n", rc, dma_translation.iov_count);
    1445           1 :                         return rc;
    1446             :                 }
    1447             : 
    1448           1 :                 _ctx->lkey = dma_translation.rdma.lkey;
    1449           1 :                 _ctx->rkey = dma_translation.rdma.rkey;
    1450           1 :                 _ctx->addr = dma_translation.iov.iov_base;
    1451           1 :                 _ctx->length = dma_translation.iov.iov_len;
    1452             :         } else {
    1453          26 :                 rc = spdk_rdma_get_translation(rqpair->mr_map, _ctx->addr, _ctx->length, &rdma_translation);
    1454          26 :                 if (spdk_unlikely(rc)) {
    1455           2 :                         SPDK_ERRLOG("RDMA memory translation failed, rc %d\n", rc);
    1456           2 :                         return rc;
    1457             :                 }
    1458          24 :                 if (rdma_translation.translation_type == SPDK_RDMA_TRANSLATION_MR) {
    1459          24 :                         _ctx->lkey = rdma_translation.mr_or_key.mr->lkey;
    1460          24 :                         _ctx->rkey = rdma_translation.mr_or_key.mr->rkey;
    1461             :                 } else {
    1462           0 :                         _ctx->lkey = _ctx->rkey = (uint32_t)rdma_translation.mr_or_key.key;
    1463             :                 }
    1464             :         }
    1465             : 
    1466          25 :         return 0;
    1467             : }
    1468             : 
    1469             : 
    1470             : /*
    1471             :  * Build SGL describing empty payload.
    1472             :  */
    1473             : static int
    1474           2 : nvme_rdma_build_null_request(struct spdk_nvme_rdma_req *rdma_req)
    1475             : {
    1476           2 :         struct nvme_request *req = rdma_req->req;
    1477             : 
    1478           2 :         req->cmd.psdt = SPDK_NVME_PSDT_SGL_MPTR_CONTIG;
    1479             : 
    1480             :         /* The first element of this SGL is pointing at an
    1481             :          * spdk_nvmf_cmd object. For this particular command,
    1482             :          * we only need the first 64 bytes corresponding to
    1483             :          * the NVMe command. */
    1484           2 :         rdma_req->send_sgl[0].length = sizeof(struct spdk_nvme_cmd);
    1485             : 
    1486             :         /* The RDMA SGL needs one element describing the NVMe command. */
    1487           2 :         rdma_req->send_wr.num_sge = 1;
    1488             : 
    1489           2 :         req->cmd.dptr.sgl1.keyed.type = SPDK_NVME_SGL_TYPE_KEYED_DATA_BLOCK;
    1490           2 :         req->cmd.dptr.sgl1.keyed.subtype = SPDK_NVME_SGL_SUBTYPE_ADDRESS;
    1491           2 :         req->cmd.dptr.sgl1.keyed.length = 0;
    1492           2 :         req->cmd.dptr.sgl1.keyed.key = 0;
    1493           2 :         req->cmd.dptr.sgl1.address = 0;
    1494             : 
    1495           2 :         return 0;
    1496             : }
    1497             : 
    1498             : /*
    1499             :  * Build inline SGL describing contiguous payload buffer.
    1500             :  */
    1501             : static int
    1502           3 : nvme_rdma_build_contig_inline_request(struct nvme_rdma_qpair *rqpair,
    1503             :                                       struct spdk_nvme_rdma_req *rdma_req)
    1504             : {
    1505           3 :         struct nvme_request *req = rdma_req->req;
    1506           3 :         struct nvme_rdma_memory_translation_ctx ctx = {
    1507           3 :                 .addr = (uint8_t *)req->payload.contig_or_cb_arg + req->payload_offset,
    1508           3 :                 .length = req->payload_size
    1509             :         };
    1510             :         int rc;
    1511             : 
    1512           3 :         assert(ctx.length != 0);
    1513           3 :         assert(nvme_payload_type(&req->payload) == NVME_PAYLOAD_TYPE_CONTIG);
    1514             : 
    1515           3 :         rc = nvme_rdma_get_memory_translation(req, rqpair, &ctx);
    1516           3 :         if (spdk_unlikely(rc)) {
    1517           0 :                 return -1;
    1518             :         }
    1519             : 
    1520           3 :         rdma_req->send_sgl[1].lkey = ctx.lkey;
    1521             : 
    1522             :         /* The first element of this SGL is pointing at an
    1523             :          * spdk_nvmf_cmd object. For this particular command,
    1524             :          * we only need the first 64 bytes corresponding to
    1525             :          * the NVMe command. */
    1526           3 :         rdma_req->send_sgl[0].length = sizeof(struct spdk_nvme_cmd);
    1527             : 
    1528           3 :         rdma_req->send_sgl[1].addr = (uint64_t)ctx.addr;
    1529           3 :         rdma_req->send_sgl[1].length = (uint32_t)ctx.length;
    1530             : 
    1531             :         /* The RDMA SGL contains two elements. The first describes
    1532             :          * the NVMe command and the second describes the data
    1533             :          * payload. */
    1534           3 :         rdma_req->send_wr.num_sge = 2;
    1535             : 
    1536           3 :         req->cmd.psdt = SPDK_NVME_PSDT_SGL_MPTR_CONTIG;
    1537           3 :         req->cmd.dptr.sgl1.unkeyed.type = SPDK_NVME_SGL_TYPE_DATA_BLOCK;
    1538           3 :         req->cmd.dptr.sgl1.unkeyed.subtype = SPDK_NVME_SGL_SUBTYPE_OFFSET;
    1539           3 :         req->cmd.dptr.sgl1.unkeyed.length = (uint32_t)ctx.length;
    1540             :         /* Inline only supported for icdoff == 0 currently.  This function will
    1541             :          * not get called for controllers with other values. */
    1542           3 :         req->cmd.dptr.sgl1.address = (uint64_t)0;
    1543             : 
    1544           3 :         return 0;
    1545             : }
    1546             : 
    1547             : /*
    1548             :  * Build SGL describing contiguous payload buffer.
    1549             :  */
    1550             : static int
    1551           3 : nvme_rdma_build_contig_request(struct nvme_rdma_qpair *rqpair,
    1552             :                                struct spdk_nvme_rdma_req *rdma_req)
    1553             : {
    1554           3 :         struct nvme_request *req = rdma_req->req;
    1555           3 :         struct nvme_rdma_memory_translation_ctx ctx = {
    1556           3 :                 .addr = (uint8_t *)req->payload.contig_or_cb_arg + req->payload_offset,
    1557           3 :                 .length = req->payload_size
    1558             :         };
    1559             :         int rc;
    1560             : 
    1561           3 :         assert(req->payload_size != 0);
    1562           3 :         assert(nvme_payload_type(&req->payload) == NVME_PAYLOAD_TYPE_CONTIG);
    1563             : 
    1564           3 :         if (spdk_unlikely(req->payload_size > NVME_RDMA_MAX_KEYED_SGL_LENGTH)) {
    1565           1 :                 SPDK_ERRLOG("SGL length %u exceeds max keyed SGL block size %u\n",
    1566             :                             req->payload_size, NVME_RDMA_MAX_KEYED_SGL_LENGTH);
    1567           1 :                 return -1;
    1568             :         }
    1569             : 
    1570           2 :         rc = nvme_rdma_get_memory_translation(req, rqpair, &ctx);
    1571           2 :         if (spdk_unlikely(rc)) {
    1572           0 :                 return -1;
    1573             :         }
    1574             : 
    1575           2 :         req->cmd.dptr.sgl1.keyed.key = ctx.rkey;
    1576             : 
    1577             :         /* The first element of this SGL is pointing at an
    1578             :          * spdk_nvmf_cmd object. For this particular command,
    1579             :          * we only need the first 64 bytes corresponding to
    1580             :          * the NVMe command. */
    1581           2 :         rdma_req->send_sgl[0].length = sizeof(struct spdk_nvme_cmd);
    1582             : 
    1583             :         /* The RDMA SGL needs one element describing the NVMe command. */
    1584           2 :         rdma_req->send_wr.num_sge = 1;
    1585             : 
    1586           2 :         req->cmd.psdt = SPDK_NVME_PSDT_SGL_MPTR_CONTIG;
    1587           2 :         req->cmd.dptr.sgl1.keyed.type = SPDK_NVME_SGL_TYPE_KEYED_DATA_BLOCK;
    1588           2 :         req->cmd.dptr.sgl1.keyed.subtype = SPDK_NVME_SGL_SUBTYPE_ADDRESS;
    1589           2 :         req->cmd.dptr.sgl1.keyed.length = (uint32_t)ctx.length;
    1590           2 :         req->cmd.dptr.sgl1.address = (uint64_t)ctx.addr;
    1591             : 
    1592           2 :         return 0;
    1593             : }
    1594             : 
    1595             : /*
    1596             :  * Build SGL describing scattered payload buffer.
    1597             :  */
    1598             : static int
    1599           7 : nvme_rdma_build_sgl_request(struct nvme_rdma_qpair *rqpair,
    1600             :                             struct spdk_nvme_rdma_req *rdma_req)
    1601             : {
    1602           7 :         struct nvme_request *req = rdma_req->req;
    1603           7 :         struct spdk_nvmf_cmd *cmd = &rqpair->cmds[rdma_req->id];
    1604           7 :         struct nvme_rdma_memory_translation_ctx ctx;
    1605             :         uint32_t remaining_size;
    1606           7 :         uint32_t sge_length;
    1607             :         int rc, max_num_sgl, num_sgl_desc;
    1608             : 
    1609           7 :         assert(req->payload_size != 0);
    1610           7 :         assert(nvme_payload_type(&req->payload) == NVME_PAYLOAD_TYPE_SGL);
    1611           7 :         assert(req->payload.reset_sgl_fn != NULL);
    1612           7 :         assert(req->payload.next_sge_fn != NULL);
    1613           7 :         req->payload.reset_sgl_fn(req->payload.contig_or_cb_arg, req->payload_offset);
    1614             : 
    1615           7 :         max_num_sgl = req->qpair->ctrlr->max_sges;
    1616             : 
    1617           7 :         remaining_size = req->payload_size;
    1618           7 :         num_sgl_desc = 0;
    1619             :         do {
    1620          18 :                 rc = req->payload.next_sge_fn(req->payload.contig_or_cb_arg, &ctx.addr, &sge_length);
    1621          18 :                 if (rc) {
    1622           1 :                         return -1;
    1623             :                 }
    1624             : 
    1625          17 :                 sge_length = spdk_min(remaining_size, sge_length);
    1626             : 
    1627          17 :                 if (spdk_unlikely(sge_length > NVME_RDMA_MAX_KEYED_SGL_LENGTH)) {
    1628           1 :                         SPDK_ERRLOG("SGL length %u exceeds max keyed SGL block size %u\n",
    1629             :                                     sge_length, NVME_RDMA_MAX_KEYED_SGL_LENGTH);
    1630           1 :                         return -1;
    1631             :                 }
    1632          16 :                 ctx.length = sge_length;
    1633          16 :                 rc = nvme_rdma_get_memory_translation(req, rqpair, &ctx);
    1634          16 :                 if (spdk_unlikely(rc)) {
    1635           1 :                         return -1;
    1636             :                 }
    1637             : 
    1638          15 :                 cmd->sgl[num_sgl_desc].keyed.key = ctx.rkey;
    1639          15 :                 cmd->sgl[num_sgl_desc].keyed.type = SPDK_NVME_SGL_TYPE_KEYED_DATA_BLOCK;
    1640          15 :                 cmd->sgl[num_sgl_desc].keyed.subtype = SPDK_NVME_SGL_SUBTYPE_ADDRESS;
    1641          15 :                 cmd->sgl[num_sgl_desc].keyed.length = (uint32_t)ctx.length;
    1642          15 :                 cmd->sgl[num_sgl_desc].address = (uint64_t)ctx.addr;
    1643             : 
    1644          15 :                 remaining_size -= ctx.length;
    1645          15 :                 num_sgl_desc++;
    1646          15 :         } while (remaining_size > 0 && num_sgl_desc < max_num_sgl);
    1647             : 
    1648             : 
    1649             :         /* Should be impossible if we did our sgl checks properly up the stack, but do a sanity check here. */
    1650           4 :         if (remaining_size > 0) {
    1651           0 :                 return -1;
    1652             :         }
    1653             : 
    1654           4 :         req->cmd.psdt = SPDK_NVME_PSDT_SGL_MPTR_CONTIG;
    1655             : 
    1656             :         /* The RDMA SGL needs one element describing some portion
    1657             :          * of the spdk_nvmf_cmd structure. */
    1658           4 :         rdma_req->send_wr.num_sge = 1;
    1659             : 
    1660             :         /*
    1661             :          * If only one SGL descriptor is required, it can be embedded directly in the command
    1662             :          * as a data block descriptor.
    1663             :          */
    1664           4 :         if (num_sgl_desc == 1) {
    1665             :                 /* The first element of this SGL is pointing at an
    1666             :                  * spdk_nvmf_cmd object. For this particular command,
    1667             :                  * we only need the first 64 bytes corresponding to
    1668             :                  * the NVMe command. */
    1669           2 :                 rdma_req->send_sgl[0].length = sizeof(struct spdk_nvme_cmd);
    1670             : 
    1671           2 :                 req->cmd.dptr.sgl1.keyed.type = cmd->sgl[0].keyed.type;
    1672           2 :                 req->cmd.dptr.sgl1.keyed.subtype = cmd->sgl[0].keyed.subtype;
    1673           2 :                 req->cmd.dptr.sgl1.keyed.length = cmd->sgl[0].keyed.length;
    1674           2 :                 req->cmd.dptr.sgl1.keyed.key = cmd->sgl[0].keyed.key;
    1675           2 :                 req->cmd.dptr.sgl1.address = cmd->sgl[0].address;
    1676             :         } else {
    1677             :                 /*
    1678             :                  * Otherwise, The SGL descriptor embedded in the command must point to the list of
    1679             :                  * SGL descriptors used to describe the operation. In that case it is a last segment descriptor.
    1680             :                  */
    1681           2 :                 uint32_t descriptors_size = sizeof(struct spdk_nvme_sgl_descriptor) * num_sgl_desc;
    1682             : 
    1683           2 :                 if (spdk_unlikely(descriptors_size > rqpair->qpair.ctrlr->ioccsz_bytes)) {
    1684           1 :                         SPDK_ERRLOG("Size of SGL descriptors (%u) exceeds ICD (%u)\n",
    1685             :                                     descriptors_size, rqpair->qpair.ctrlr->ioccsz_bytes);
    1686           1 :                         return -1;
    1687             :                 }
    1688           1 :                 rdma_req->send_sgl[0].length = sizeof(struct spdk_nvme_cmd) + descriptors_size;
    1689             : 
    1690           1 :                 req->cmd.dptr.sgl1.unkeyed.type = SPDK_NVME_SGL_TYPE_LAST_SEGMENT;
    1691           1 :                 req->cmd.dptr.sgl1.unkeyed.subtype = SPDK_NVME_SGL_SUBTYPE_OFFSET;
    1692           1 :                 req->cmd.dptr.sgl1.unkeyed.length = descriptors_size;
    1693           1 :                 req->cmd.dptr.sgl1.address = (uint64_t)0;
    1694             :         }
    1695             : 
    1696           3 :         return 0;
    1697             : }
    1698             : 
    1699             : /*
    1700             :  * Build inline SGL describing sgl payload buffer.
    1701             :  */
    1702             : static int
    1703           3 : nvme_rdma_build_sgl_inline_request(struct nvme_rdma_qpair *rqpair,
    1704             :                                    struct spdk_nvme_rdma_req *rdma_req)
    1705             : {
    1706           3 :         struct nvme_request *req = rdma_req->req;
    1707           3 :         struct nvme_rdma_memory_translation_ctx ctx;
    1708           3 :         uint32_t length;
    1709             :         int rc;
    1710             : 
    1711           3 :         assert(req->payload_size != 0);
    1712           3 :         assert(nvme_payload_type(&req->payload) == NVME_PAYLOAD_TYPE_SGL);
    1713           3 :         assert(req->payload.reset_sgl_fn != NULL);
    1714           3 :         assert(req->payload.next_sge_fn != NULL);
    1715           3 :         req->payload.reset_sgl_fn(req->payload.contig_or_cb_arg, req->payload_offset);
    1716             : 
    1717           3 :         rc = req->payload.next_sge_fn(req->payload.contig_or_cb_arg, &ctx.addr, &length);
    1718           3 :         if (rc) {
    1719           0 :                 return -1;
    1720             :         }
    1721             : 
    1722           3 :         if (length < req->payload_size) {
    1723           0 :                 SPDK_DEBUGLOG(nvme, "Inline SGL request split so sending separately.\n");
    1724           0 :                 return nvme_rdma_build_sgl_request(rqpair, rdma_req);
    1725             :         }
    1726             : 
    1727           3 :         if (length > req->payload_size) {
    1728           0 :                 length = req->payload_size;
    1729             :         }
    1730             : 
    1731           3 :         ctx.length = length;
    1732           3 :         rc = nvme_rdma_get_memory_translation(req, rqpair, &ctx);
    1733           3 :         if (spdk_unlikely(rc)) {
    1734           0 :                 return -1;
    1735             :         }
    1736             : 
    1737           3 :         rdma_req->send_sgl[1].addr = (uint64_t)ctx.addr;
    1738           3 :         rdma_req->send_sgl[1].length = (uint32_t)ctx.length;
    1739           3 :         rdma_req->send_sgl[1].lkey = ctx.lkey;
    1740             : 
    1741           3 :         rdma_req->send_wr.num_sge = 2;
    1742             : 
    1743             :         /* The first element of this SGL is pointing at an
    1744             :          * spdk_nvmf_cmd object. For this particular command,
    1745             :          * we only need the first 64 bytes corresponding to
    1746             :          * the NVMe command. */
    1747           3 :         rdma_req->send_sgl[0].length = sizeof(struct spdk_nvme_cmd);
    1748             : 
    1749           3 :         req->cmd.psdt = SPDK_NVME_PSDT_SGL_MPTR_CONTIG;
    1750           3 :         req->cmd.dptr.sgl1.unkeyed.type = SPDK_NVME_SGL_TYPE_DATA_BLOCK;
    1751           3 :         req->cmd.dptr.sgl1.unkeyed.subtype = SPDK_NVME_SGL_SUBTYPE_OFFSET;
    1752           3 :         req->cmd.dptr.sgl1.unkeyed.length = (uint32_t)ctx.length;
    1753             :         /* Inline only supported for icdoff == 0 currently.  This function will
    1754             :          * not get called for controllers with other values. */
    1755           3 :         req->cmd.dptr.sgl1.address = (uint64_t)0;
    1756             : 
    1757           3 :         return 0;
    1758             : }
    1759             : 
    1760             : static int
    1761           6 : nvme_rdma_req_init(struct nvme_rdma_qpair *rqpair, struct nvme_request *req,
    1762             :                    struct spdk_nvme_rdma_req *rdma_req)
    1763             : {
    1764           6 :         struct spdk_nvme_ctrlr *ctrlr = rqpair->qpair.ctrlr;
    1765             :         enum nvme_payload_type payload_type;
    1766             :         bool icd_supported;
    1767             :         int rc;
    1768             : 
    1769           6 :         assert(rdma_req->req == NULL);
    1770           6 :         rdma_req->req = req;
    1771           6 :         req->cmd.cid = rdma_req->id;
    1772           6 :         payload_type = nvme_payload_type(&req->payload);
    1773             :         /*
    1774             :          * Check if icdoff is non zero, to avoid interop conflicts with
    1775             :          * targets with non-zero icdoff.  Both SPDK and the Linux kernel
    1776             :          * targets use icdoff = 0.  For targets with non-zero icdoff, we
    1777             :          * will currently just not use inline data for now.
    1778             :          */
    1779           6 :         icd_supported = spdk_nvme_opc_get_data_transfer(req->cmd.opc) == SPDK_NVME_DATA_HOST_TO_CONTROLLER
    1780           6 :                         && req->payload_size <= ctrlr->ioccsz_bytes && ctrlr->icdoff == 0;
    1781             : 
    1782           6 :         if (req->payload_size == 0) {
    1783           2 :                 rc = nvme_rdma_build_null_request(rdma_req);
    1784           4 :         } else if (payload_type == NVME_PAYLOAD_TYPE_CONTIG) {
    1785           2 :                 if (icd_supported) {
    1786           1 :                         rc = nvme_rdma_build_contig_inline_request(rqpair, rdma_req);
    1787             :                 } else {
    1788           1 :                         rc = nvme_rdma_build_contig_request(rqpair, rdma_req);
    1789             :                 }
    1790           2 :         } else if (payload_type == NVME_PAYLOAD_TYPE_SGL) {
    1791           2 :                 if (icd_supported) {
    1792           1 :                         rc = nvme_rdma_build_sgl_inline_request(rqpair, rdma_req);
    1793             :                 } else {
    1794           1 :                         rc = nvme_rdma_build_sgl_request(rqpair, rdma_req);
    1795             :                 }
    1796             :         } else {
    1797           0 :                 rc = -1;
    1798             :         }
    1799             : 
    1800           6 :         if (rc) {
    1801           0 :                 rdma_req->req = NULL;
    1802           0 :                 return rc;
    1803             :         }
    1804             : 
    1805           6 :         memcpy(&rqpair->cmds[rdma_req->id], &req->cmd, sizeof(req->cmd));
    1806           6 :         return 0;
    1807             : }
    1808             : 
    1809             : static struct spdk_nvme_qpair *
    1810           5 : nvme_rdma_ctrlr_create_qpair(struct spdk_nvme_ctrlr *ctrlr,
    1811             :                              uint16_t qid, uint32_t qsize,
    1812             :                              enum spdk_nvme_qprio qprio,
    1813             :                              uint32_t num_requests,
    1814             :                              bool delay_cmd_submit,
    1815             :                              bool async)
    1816             : {
    1817             :         struct nvme_rdma_qpair *rqpair;
    1818             :         struct spdk_nvme_qpair *qpair;
    1819             :         int rc;
    1820             : 
    1821           5 :         if (qsize < SPDK_NVME_QUEUE_MIN_ENTRIES) {
    1822           2 :                 SPDK_ERRLOG("Failed to create qpair with size %u. Minimum queue size is %d.\n",
    1823             :                             qsize, SPDK_NVME_QUEUE_MIN_ENTRIES);
    1824           2 :                 return NULL;
    1825             :         }
    1826             : 
    1827           3 :         rqpair = spdk_zmalloc(sizeof(struct nvme_rdma_qpair), 0, NULL, SPDK_ENV_SOCKET_ID_ANY,
    1828             :                               SPDK_MALLOC_DMA);
    1829           3 :         if (!rqpair) {
    1830           0 :                 SPDK_ERRLOG("failed to get create rqpair\n");
    1831           0 :                 return NULL;
    1832             :         }
    1833             : 
    1834             :         /* Set num_entries one less than queue size. According to NVMe
    1835             :          * and NVMe-oF specs we can not submit queue size requests,
    1836             :          * one slot shall always remain empty.
    1837             :          */
    1838           3 :         rqpair->num_entries = qsize - 1;
    1839           3 :         rqpair->delay_cmd_submit = delay_cmd_submit;
    1840           3 :         rqpair->state = NVME_RDMA_QPAIR_STATE_INVALID;
    1841           3 :         qpair = &rqpair->qpair;
    1842           3 :         rc = nvme_qpair_init(qpair, qid, ctrlr, qprio, num_requests, async);
    1843           3 :         if (rc != 0) {
    1844           0 :                 spdk_free(rqpair);
    1845           0 :                 return NULL;
    1846             :         }
    1847             : 
    1848           3 :         return qpair;
    1849             : }
    1850             : 
    1851             : static void
    1852           1 : nvme_rdma_qpair_destroy(struct nvme_rdma_qpair *rqpair)
    1853             : {
    1854           1 :         struct spdk_nvme_qpair *qpair = &rqpair->qpair;
    1855             :         struct nvme_rdma_ctrlr *rctrlr;
    1856             :         struct nvme_rdma_cm_event_entry *entry, *tmp;
    1857             : 
    1858           1 :         spdk_rdma_free_mem_map(&rqpair->mr_map);
    1859             : 
    1860           1 :         if (rqpair->evt) {
    1861           0 :                 rdma_ack_cm_event(rqpair->evt);
    1862           0 :                 rqpair->evt = NULL;
    1863             :         }
    1864             : 
    1865             :         /*
    1866             :          * This works because we have the controller lock both in
    1867             :          * this function and in the function where we add new events.
    1868             :          */
    1869           1 :         if (qpair->ctrlr != NULL) {
    1870           1 :                 rctrlr = nvme_rdma_ctrlr(qpair->ctrlr);
    1871           1 :                 STAILQ_FOREACH_SAFE(entry, &rctrlr->pending_cm_events, link, tmp) {
    1872           0 :                         if (entry->evt->id->context == rqpair) {
    1873           0 :                                 STAILQ_REMOVE(&rctrlr->pending_cm_events, entry, nvme_rdma_cm_event_entry, link);
    1874           0 :                                 rdma_ack_cm_event(entry->evt);
    1875           0 :                                 STAILQ_INSERT_HEAD(&rctrlr->free_cm_events, entry, link);
    1876             :                         }
    1877             :                 }
    1878             :         }
    1879             : 
    1880           1 :         if (rqpair->cm_id) {
    1881           0 :                 if (rqpair->rdma_qp) {
    1882           0 :                         spdk_rdma_put_pd(rqpair->rdma_qp->qp->pd);
    1883           0 :                         spdk_rdma_qp_destroy(rqpair->rdma_qp);
    1884           0 :                         rqpair->rdma_qp = NULL;
    1885             :                 }
    1886             :         }
    1887             : 
    1888           1 :         if (rqpair->poller) {
    1889             :                 struct nvme_rdma_poll_group     *group;
    1890             : 
    1891           0 :                 assert(qpair->poll_group);
    1892           0 :                 group = nvme_rdma_poll_group(qpair->poll_group);
    1893             : 
    1894           0 :                 nvme_rdma_poll_group_put_poller(group, rqpair->poller);
    1895             : 
    1896           0 :                 rqpair->poller = NULL;
    1897           0 :                 rqpair->cq = NULL;
    1898           0 :                 if (rqpair->srq) {
    1899           0 :                         rqpair->srq = NULL;
    1900           0 :                         rqpair->rsps = NULL;
    1901             :                 }
    1902           1 :         } else if (rqpair->cq) {
    1903           0 :                 ibv_destroy_cq(rqpair->cq);
    1904           0 :                 rqpair->cq = NULL;
    1905             :         }
    1906             : 
    1907           1 :         nvme_rdma_free_reqs(rqpair);
    1908           1 :         nvme_rdma_free_rsps(rqpair->rsps);
    1909           1 :         rqpair->rsps = NULL;
    1910             : 
    1911             :         /* destroy cm_id last so cma device will not be freed before we destroy the cq. */
    1912           1 :         if (rqpair->cm_id) {
    1913           0 :                 rdma_destroy_id(rqpair->cm_id);
    1914           0 :                 rqpair->cm_id = NULL;
    1915             :         }
    1916           1 : }
    1917             : 
    1918             : static void nvme_rdma_qpair_abort_reqs(struct spdk_nvme_qpair *qpair, uint32_t dnr);
    1919             : 
    1920             : static int
    1921           1 : nvme_rdma_qpair_disconnected(struct nvme_rdma_qpair *rqpair, int ret)
    1922             : {
    1923           1 :         if (ret) {
    1924           0 :                 SPDK_DEBUGLOG(nvme, "Target did not respond to qpair disconnect.\n");
    1925           0 :                 goto quiet;
    1926             :         }
    1927             : 
    1928           1 :         if (rqpair->poller == NULL) {
    1929             :                 /* If poller is not used, cq is not shared.
    1930             :                  * So complete disconnecting qpair immediately.
    1931             :                  */
    1932           1 :                 goto quiet;
    1933             :         }
    1934             : 
    1935           0 :         if (rqpair->rsps == NULL) {
    1936           0 :                 goto quiet;
    1937             :         }
    1938             : 
    1939           0 :         if (rqpair->need_destroy ||
    1940           0 :             (rqpair->current_num_sends != 0 ||
    1941           0 :              (!rqpair->srq && rqpair->rsps->current_num_recvs != 0))) {
    1942           0 :                 rqpair->state = NVME_RDMA_QPAIR_STATE_LINGERING;
    1943           0 :                 rqpair->evt_timeout_ticks = (NVME_RDMA_DISCONNECTED_QPAIR_TIMEOUT_US * spdk_get_ticks_hz()) /
    1944           0 :                                             SPDK_SEC_TO_USEC + spdk_get_ticks();
    1945             : 
    1946           0 :                 return -EAGAIN;
    1947             :         }
    1948             : 
    1949           0 : quiet:
    1950           1 :         rqpair->state = NVME_RDMA_QPAIR_STATE_EXITED;
    1951             : 
    1952           1 :         nvme_rdma_qpair_abort_reqs(&rqpair->qpair, 0);
    1953           1 :         nvme_rdma_qpair_destroy(rqpair);
    1954           1 :         nvme_transport_ctrlr_disconnect_qpair_done(&rqpair->qpair);
    1955             : 
    1956           1 :         return 0;
    1957             : }
    1958             : 
    1959             : static int
    1960           0 : nvme_rdma_qpair_wait_until_quiet(struct nvme_rdma_qpair *rqpair)
    1961             : {
    1962           0 :         if (spdk_get_ticks() < rqpair->evt_timeout_ticks &&
    1963           0 :             (rqpair->current_num_sends != 0 ||
    1964           0 :              (!rqpair->srq && rqpair->rsps->current_num_recvs != 0))) {
    1965           0 :                 return -EAGAIN;
    1966             :         }
    1967             : 
    1968           0 :         rqpair->state = NVME_RDMA_QPAIR_STATE_EXITED;
    1969             : 
    1970           0 :         nvme_rdma_qpair_abort_reqs(&rqpair->qpair, 0);
    1971           0 :         nvme_rdma_qpair_destroy(rqpair);
    1972           0 :         nvme_transport_ctrlr_disconnect_qpair_done(&rqpair->qpair);
    1973             : 
    1974           0 :         return 0;
    1975             : }
    1976             : 
    1977             : static void
    1978           0 : _nvme_rdma_ctrlr_disconnect_qpair(struct spdk_nvme_ctrlr *ctrlr, struct spdk_nvme_qpair *qpair,
    1979             :                                   nvme_rdma_cm_event_cb disconnected_qpair_cb)
    1980             : {
    1981           0 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    1982             :         int rc;
    1983             : 
    1984           0 :         assert(disconnected_qpair_cb != NULL);
    1985             : 
    1986           0 :         rqpair->state = NVME_RDMA_QPAIR_STATE_EXITING;
    1987             : 
    1988           0 :         if (rqpair->cm_id) {
    1989           0 :                 if (rqpair->rdma_qp) {
    1990           0 :                         rc = spdk_rdma_qp_disconnect(rqpair->rdma_qp);
    1991           0 :                         if ((qpair->ctrlr != NULL) && (rc == 0)) {
    1992           0 :                                 rc = nvme_rdma_process_event_start(rqpair, RDMA_CM_EVENT_DISCONNECTED,
    1993             :                                                                    disconnected_qpair_cb);
    1994           0 :                                 if (rc == 0) {
    1995           0 :                                         return;
    1996             :                                 }
    1997             :                         }
    1998             :                 }
    1999             :         }
    2000             : 
    2001           0 :         disconnected_qpair_cb(rqpair, 0);
    2002             : }
    2003             : 
    2004             : static int
    2005           0 : nvme_rdma_ctrlr_disconnect_qpair_poll(struct spdk_nvme_ctrlr *ctrlr, struct spdk_nvme_qpair *qpair)
    2006             : {
    2007           0 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    2008             :         int rc;
    2009             : 
    2010           0 :         switch (rqpair->state) {
    2011           0 :         case NVME_RDMA_QPAIR_STATE_EXITING:
    2012           0 :                 if (!nvme_qpair_is_admin_queue(qpair)) {
    2013           0 :                         nvme_ctrlr_lock(ctrlr);
    2014             :                 }
    2015             : 
    2016           0 :                 rc = nvme_rdma_process_event_poll(rqpair);
    2017             : 
    2018           0 :                 if (!nvme_qpair_is_admin_queue(qpair)) {
    2019           0 :                         nvme_ctrlr_unlock(ctrlr);
    2020             :                 }
    2021           0 :                 break;
    2022             : 
    2023           0 :         case NVME_RDMA_QPAIR_STATE_LINGERING:
    2024           0 :                 rc = nvme_rdma_qpair_wait_until_quiet(rqpair);
    2025           0 :                 break;
    2026           0 :         case NVME_RDMA_QPAIR_STATE_EXITED:
    2027           0 :                 rc = 0;
    2028           0 :                 break;
    2029             : 
    2030           0 :         default:
    2031           0 :                 assert(false);
    2032             :                 rc = -EAGAIN;
    2033             :                 break;
    2034             :         }
    2035             : 
    2036           0 :         return rc;
    2037             : }
    2038             : 
    2039             : static void
    2040           0 : nvme_rdma_ctrlr_disconnect_qpair(struct spdk_nvme_ctrlr *ctrlr, struct spdk_nvme_qpair *qpair)
    2041             : {
    2042             :         int rc;
    2043             : 
    2044           0 :         _nvme_rdma_ctrlr_disconnect_qpair(ctrlr, qpair, nvme_rdma_qpair_disconnected);
    2045             : 
    2046             :         /* If the async mode is disabled, poll the qpair until it is actually disconnected.
    2047             :          * It is ensured that poll_group_process_completions() calls disconnected_qpair_cb
    2048             :          * for any disconnected qpair. Hence, we do not have to check if the qpair is in
    2049             :          * a poll group or not.
    2050             :          * At the same time, if the qpair is being destroyed, i.e. this function is called by
    2051             :          * spdk_nvme_ctrlr_free_io_qpair then we need to wait until qpair is disconnected, otherwise
    2052             :          * we may leak some resources.
    2053             :          */
    2054           0 :         if (qpair->async && !qpair->destroy_in_progress) {
    2055           0 :                 return;
    2056             :         }
    2057             : 
    2058             :         while (1) {
    2059           0 :                 rc = nvme_rdma_ctrlr_disconnect_qpair_poll(ctrlr, qpair);
    2060           0 :                 if (rc != -EAGAIN) {
    2061           0 :                         break;
    2062             :                 }
    2063             :         }
    2064             : }
    2065             : 
    2066             : static int
    2067           0 : nvme_rdma_stale_conn_disconnected(struct nvme_rdma_qpair *rqpair, int ret)
    2068             : {
    2069           0 :         struct spdk_nvme_qpair *qpair = &rqpair->qpair;
    2070             : 
    2071           0 :         if (ret) {
    2072           0 :                 SPDK_DEBUGLOG(nvme, "Target did not respond to qpair disconnect.\n");
    2073             :         }
    2074             : 
    2075           0 :         nvme_rdma_qpair_destroy(rqpair);
    2076             : 
    2077           0 :         qpair->last_transport_failure_reason = qpair->transport_failure_reason;
    2078           0 :         qpair->transport_failure_reason = SPDK_NVME_QPAIR_FAILURE_NONE;
    2079             : 
    2080           0 :         rqpair->state = NVME_RDMA_QPAIR_STATE_STALE_CONN;
    2081           0 :         rqpair->evt_timeout_ticks = (NVME_RDMA_STALE_CONN_RETRY_DELAY_US * spdk_get_ticks_hz()) /
    2082           0 :                                     SPDK_SEC_TO_USEC + spdk_get_ticks();
    2083             : 
    2084           0 :         return 0;
    2085             : }
    2086             : 
    2087             : static int
    2088           0 : nvme_rdma_stale_conn_retry(struct nvme_rdma_qpair *rqpair)
    2089             : {
    2090           0 :         struct spdk_nvme_qpair *qpair = &rqpair->qpair;
    2091             : 
    2092           0 :         if (rqpair->stale_conn_retry_count >= NVME_RDMA_STALE_CONN_RETRY_MAX) {
    2093           0 :                 SPDK_ERRLOG("Retry failed %d times, give up stale connection to qpair (cntlid:%u, qid:%u).\n",
    2094             :                             NVME_RDMA_STALE_CONN_RETRY_MAX, qpair->ctrlr->cntlid, qpair->id);
    2095           0 :                 return -ESTALE;
    2096             :         }
    2097             : 
    2098           0 :         rqpair->stale_conn_retry_count++;
    2099             : 
    2100           0 :         SPDK_NOTICELOG("%d times, retry stale connection to qpair (cntlid:%u, qid:%u).\n",
    2101             :                        rqpair->stale_conn_retry_count, qpair->ctrlr->cntlid, qpair->id);
    2102             : 
    2103           0 :         _nvme_rdma_ctrlr_disconnect_qpair(qpair->ctrlr, qpair, nvme_rdma_stale_conn_disconnected);
    2104             : 
    2105           0 :         return 0;
    2106             : }
    2107             : 
    2108             : static int
    2109           1 : nvme_rdma_ctrlr_delete_io_qpair(struct spdk_nvme_ctrlr *ctrlr, struct spdk_nvme_qpair *qpair)
    2110             : {
    2111             :         struct nvme_rdma_qpair *rqpair;
    2112             : 
    2113           1 :         assert(qpair != NULL);
    2114           1 :         rqpair = nvme_rdma_qpair(qpair);
    2115             : 
    2116           1 :         if (rqpair->state != NVME_RDMA_QPAIR_STATE_EXITED) {
    2117             :                 int rc __attribute__((unused));
    2118             : 
    2119             :                 /* qpair was removed from the poll group while the disconnect is not finished.
    2120             :                  * Destroy rdma resources forcefully. */
    2121           1 :                 rc = nvme_rdma_qpair_disconnected(rqpair, 0);
    2122           1 :                 assert(rc == 0);
    2123             :         }
    2124             : 
    2125           1 :         nvme_rdma_qpair_abort_reqs(qpair, 0);
    2126           1 :         nvme_qpair_deinit(qpair);
    2127             : 
    2128           1 :         nvme_rdma_put_memory_domain(rqpair->memory_domain);
    2129             : 
    2130           1 :         spdk_free(rqpair);
    2131             : 
    2132           1 :         return 0;
    2133             : }
    2134             : 
    2135             : static struct spdk_nvme_qpair *
    2136           0 : nvme_rdma_ctrlr_create_io_qpair(struct spdk_nvme_ctrlr *ctrlr, uint16_t qid,
    2137             :                                 const struct spdk_nvme_io_qpair_opts *opts)
    2138             : {
    2139           0 :         return nvme_rdma_ctrlr_create_qpair(ctrlr, qid, opts->io_queue_size, opts->qprio,
    2140             :                                             opts->io_queue_requests,
    2141           0 :                                             opts->delay_cmd_submit,
    2142           0 :                                             opts->async_mode);
    2143             : }
    2144             : 
    2145             : static int
    2146           0 : nvme_rdma_ctrlr_enable(struct spdk_nvme_ctrlr *ctrlr)
    2147             : {
    2148             :         /* do nothing here */
    2149           0 :         return 0;
    2150             : }
    2151             : 
    2152             : static int nvme_rdma_ctrlr_destruct(struct spdk_nvme_ctrlr *ctrlr);
    2153             : 
    2154             : /* We have to use the typedef in the function declaration to appease astyle. */
    2155             : typedef struct spdk_nvme_ctrlr spdk_nvme_ctrlr_t;
    2156             : 
    2157             : static spdk_nvme_ctrlr_t *
    2158           1 : nvme_rdma_ctrlr_construct(const struct spdk_nvme_transport_id *trid,
    2159             :                           const struct spdk_nvme_ctrlr_opts *opts,
    2160             :                           void *devhandle)
    2161             : {
    2162             :         struct nvme_rdma_ctrlr *rctrlr;
    2163             :         struct ibv_context **contexts;
    2164           1 :         struct ibv_device_attr dev_attr;
    2165             :         int i, flag, rc;
    2166             : 
    2167           1 :         rctrlr = spdk_zmalloc(sizeof(struct nvme_rdma_ctrlr), 0, NULL, SPDK_ENV_SOCKET_ID_ANY,
    2168             :                               SPDK_MALLOC_DMA);
    2169           1 :         if (rctrlr == NULL) {
    2170           0 :                 SPDK_ERRLOG("could not allocate ctrlr\n");
    2171           0 :                 return NULL;
    2172             :         }
    2173             : 
    2174           1 :         rctrlr->ctrlr.opts = *opts;
    2175           1 :         rctrlr->ctrlr.trid = *trid;
    2176             : 
    2177           1 :         if (opts->transport_retry_count > NVME_RDMA_CTRLR_MAX_TRANSPORT_RETRY_COUNT) {
    2178           1 :                 SPDK_NOTICELOG("transport_retry_count exceeds max value %d, use max value\n",
    2179             :                                NVME_RDMA_CTRLR_MAX_TRANSPORT_RETRY_COUNT);
    2180           1 :                 rctrlr->ctrlr.opts.transport_retry_count = NVME_RDMA_CTRLR_MAX_TRANSPORT_RETRY_COUNT;
    2181             :         }
    2182             : 
    2183           1 :         if (opts->transport_ack_timeout > NVME_RDMA_CTRLR_MAX_TRANSPORT_ACK_TIMEOUT) {
    2184           1 :                 SPDK_NOTICELOG("transport_ack_timeout exceeds max value %d, use max value\n",
    2185             :                                NVME_RDMA_CTRLR_MAX_TRANSPORT_ACK_TIMEOUT);
    2186           1 :                 rctrlr->ctrlr.opts.transport_ack_timeout = NVME_RDMA_CTRLR_MAX_TRANSPORT_ACK_TIMEOUT;
    2187             :         }
    2188             : 
    2189           1 :         contexts = rdma_get_devices(NULL);
    2190           1 :         if (contexts == NULL) {
    2191           0 :                 SPDK_ERRLOG("rdma_get_devices() failed: %s (%d)\n", spdk_strerror(errno), errno);
    2192           0 :                 spdk_free(rctrlr);
    2193           0 :                 return NULL;
    2194             :         }
    2195             : 
    2196           1 :         i = 0;
    2197           1 :         rctrlr->max_sge = NVME_RDMA_MAX_SGL_DESCRIPTORS;
    2198             : 
    2199           3 :         while (contexts[i] != NULL) {
    2200           2 :                 rc = ibv_query_device(contexts[i], &dev_attr);
    2201           2 :                 if (rc < 0) {
    2202           0 :                         SPDK_ERRLOG("Failed to query RDMA device attributes.\n");
    2203           0 :                         rdma_free_devices(contexts);
    2204           0 :                         spdk_free(rctrlr);
    2205           0 :                         return NULL;
    2206             :                 }
    2207           2 :                 rctrlr->max_sge = spdk_min(rctrlr->max_sge, (uint16_t)dev_attr.max_sge);
    2208           2 :                 i++;
    2209             :         }
    2210             : 
    2211           1 :         rdma_free_devices(contexts);
    2212             : 
    2213           1 :         rc = nvme_ctrlr_construct(&rctrlr->ctrlr);
    2214           1 :         if (rc != 0) {
    2215           0 :                 spdk_free(rctrlr);
    2216           0 :                 return NULL;
    2217             :         }
    2218             : 
    2219           1 :         STAILQ_INIT(&rctrlr->pending_cm_events);
    2220           1 :         STAILQ_INIT(&rctrlr->free_cm_events);
    2221           1 :         rctrlr->cm_events = spdk_zmalloc(NVME_RDMA_NUM_CM_EVENTS * sizeof(*rctrlr->cm_events), 0, NULL,
    2222             :                                          SPDK_ENV_SOCKET_ID_ANY, SPDK_MALLOC_DMA);
    2223           1 :         if (rctrlr->cm_events == NULL) {
    2224           0 :                 SPDK_ERRLOG("unable to allocate buffers to hold CM events.\n");
    2225           0 :                 goto destruct_ctrlr;
    2226             :         }
    2227             : 
    2228         257 :         for (i = 0; i < NVME_RDMA_NUM_CM_EVENTS; i++) {
    2229         256 :                 STAILQ_INSERT_TAIL(&rctrlr->free_cm_events, &rctrlr->cm_events[i], link);
    2230             :         }
    2231             : 
    2232           1 :         rctrlr->cm_channel = rdma_create_event_channel();
    2233           1 :         if (rctrlr->cm_channel == NULL) {
    2234           0 :                 SPDK_ERRLOG("rdma_create_event_channel() failed\n");
    2235           0 :                 goto destruct_ctrlr;
    2236             :         }
    2237             : 
    2238           1 :         flag = fcntl(rctrlr->cm_channel->fd, F_GETFL);
    2239           1 :         if (fcntl(rctrlr->cm_channel->fd, F_SETFL, flag | O_NONBLOCK) < 0) {
    2240           0 :                 SPDK_ERRLOG("Cannot set event channel to non blocking\n");
    2241           0 :                 goto destruct_ctrlr;
    2242             :         }
    2243             : 
    2244           2 :         rctrlr->ctrlr.adminq = nvme_rdma_ctrlr_create_qpair(&rctrlr->ctrlr, 0,
    2245           1 :                                rctrlr->ctrlr.opts.admin_queue_size, 0,
    2246           1 :                                rctrlr->ctrlr.opts.admin_queue_size, false, true);
    2247           1 :         if (!rctrlr->ctrlr.adminq) {
    2248           0 :                 SPDK_ERRLOG("failed to create admin qpair\n");
    2249           0 :                 goto destruct_ctrlr;
    2250             :         }
    2251             : 
    2252           1 :         if (nvme_ctrlr_add_process(&rctrlr->ctrlr, 0) != 0) {
    2253           0 :                 SPDK_ERRLOG("nvme_ctrlr_add_process() failed\n");
    2254           0 :                 goto destruct_ctrlr;
    2255             :         }
    2256             : 
    2257           1 :         SPDK_DEBUGLOG(nvme, "successfully initialized the nvmf ctrlr\n");
    2258           1 :         return &rctrlr->ctrlr;
    2259             : 
    2260           0 : destruct_ctrlr:
    2261           0 :         nvme_ctrlr_destruct(&rctrlr->ctrlr);
    2262           0 :         return NULL;
    2263             : }
    2264             : 
    2265             : static int
    2266           1 : nvme_rdma_ctrlr_destruct(struct spdk_nvme_ctrlr *ctrlr)
    2267             : {
    2268           1 :         struct nvme_rdma_ctrlr *rctrlr = nvme_rdma_ctrlr(ctrlr);
    2269             :         struct nvme_rdma_cm_event_entry *entry;
    2270             : 
    2271           1 :         if (ctrlr->adminq) {
    2272           1 :                 nvme_rdma_ctrlr_delete_io_qpair(ctrlr, ctrlr->adminq);
    2273             :         }
    2274             : 
    2275           1 :         STAILQ_FOREACH(entry, &rctrlr->pending_cm_events, link) {
    2276           0 :                 rdma_ack_cm_event(entry->evt);
    2277             :         }
    2278             : 
    2279           1 :         STAILQ_INIT(&rctrlr->free_cm_events);
    2280           1 :         STAILQ_INIT(&rctrlr->pending_cm_events);
    2281           1 :         spdk_free(rctrlr->cm_events);
    2282             : 
    2283           1 :         if (rctrlr->cm_channel) {
    2284           1 :                 rdma_destroy_event_channel(rctrlr->cm_channel);
    2285           1 :                 rctrlr->cm_channel = NULL;
    2286             :         }
    2287             : 
    2288           1 :         nvme_ctrlr_destruct_finish(ctrlr);
    2289             : 
    2290           1 :         spdk_free(rctrlr);
    2291             : 
    2292           1 :         return 0;
    2293             : }
    2294             : 
    2295             : static int
    2296           2 : nvme_rdma_qpair_submit_request(struct spdk_nvme_qpair *qpair,
    2297             :                                struct nvme_request *req)
    2298             : {
    2299             :         struct nvme_rdma_qpair *rqpair;
    2300             :         struct spdk_nvme_rdma_req *rdma_req;
    2301             :         struct ibv_send_wr *wr;
    2302             : 
    2303           2 :         rqpair = nvme_rdma_qpair(qpair);
    2304           2 :         assert(rqpair != NULL);
    2305           2 :         assert(req != NULL);
    2306             : 
    2307           2 :         rdma_req = nvme_rdma_req_get(rqpair);
    2308           2 :         if (spdk_unlikely(!rdma_req)) {
    2309           1 :                 if (rqpair->poller) {
    2310           1 :                         rqpair->poller->stats.queued_requests++;
    2311             :                 }
    2312             :                 /* Inform the upper layer to try again later. */
    2313           1 :                 return -EAGAIN;
    2314             :         }
    2315             : 
    2316           1 :         if (nvme_rdma_req_init(rqpair, req, rdma_req)) {
    2317           0 :                 SPDK_ERRLOG("nvme_rdma_req_init() failed\n");
    2318           0 :                 nvme_rdma_req_put(rqpair, rdma_req);
    2319           0 :                 return -1;
    2320             :         }
    2321             : 
    2322           1 :         TAILQ_INSERT_TAIL(&rqpair->outstanding_reqs, rdma_req, link);
    2323             : 
    2324           1 :         assert(rqpair->current_num_sends < rqpair->num_entries);
    2325           1 :         rqpair->current_num_sends++;
    2326             : 
    2327           1 :         wr = &rdma_req->send_wr;
    2328           1 :         wr->next = NULL;
    2329           1 :         nvme_rdma_trace_ibv_sge(wr->sg_list);
    2330             : 
    2331           1 :         spdk_rdma_qp_queue_send_wrs(rqpair->rdma_qp, wr);
    2332             : 
    2333           1 :         if (!rqpair->delay_cmd_submit) {
    2334           1 :                 return nvme_rdma_qpair_submit_sends(rqpair);
    2335             :         }
    2336             : 
    2337           0 :         return 0;
    2338             : }
    2339             : 
    2340             : static int
    2341           0 : nvme_rdma_qpair_reset(struct spdk_nvme_qpair *qpair)
    2342             : {
    2343             :         /* Currently, doing nothing here */
    2344           0 :         return 0;
    2345             : }
    2346             : 
    2347             : static void
    2348           2 : nvme_rdma_qpair_abort_reqs(struct spdk_nvme_qpair *qpair, uint32_t dnr)
    2349             : {
    2350             :         struct spdk_nvme_rdma_req *rdma_req, *tmp;
    2351           2 :         struct spdk_nvme_cpl cpl;
    2352           2 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    2353             : 
    2354           2 :         cpl.sqid = qpair->id;
    2355           2 :         cpl.status.sc = SPDK_NVME_SC_ABORTED_SQ_DELETION;
    2356           2 :         cpl.status.sct = SPDK_NVME_SCT_GENERIC;
    2357           2 :         cpl.status.dnr = dnr;
    2358             : 
    2359             :         /*
    2360             :          * We cannot abort requests at the RDMA layer without
    2361             :          * unregistering them. If we do, we can still get error
    2362             :          * free completions on the shared completion queue.
    2363             :          */
    2364           2 :         if (nvme_qpair_get_state(qpair) > NVME_QPAIR_DISCONNECTING &&
    2365           0 :             nvme_qpair_get_state(qpair) != NVME_QPAIR_DESTROYING) {
    2366           0 :                 nvme_ctrlr_disconnect_qpair(qpair);
    2367             :         }
    2368             : 
    2369           2 :         TAILQ_FOREACH_SAFE(rdma_req, &rqpair->outstanding_reqs, link, tmp) {
    2370           0 :                 nvme_rdma_req_complete(rdma_req, &cpl, true);
    2371             :         }
    2372           2 : }
    2373             : 
    2374             : static void
    2375           0 : nvme_rdma_qpair_check_timeout(struct spdk_nvme_qpair *qpair)
    2376             : {
    2377             :         uint64_t t02;
    2378             :         struct spdk_nvme_rdma_req *rdma_req, *tmp;
    2379           0 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    2380           0 :         struct spdk_nvme_ctrlr *ctrlr = qpair->ctrlr;
    2381             :         struct spdk_nvme_ctrlr_process *active_proc;
    2382             : 
    2383             :         /* Don't check timeouts during controller initialization. */
    2384           0 :         if (ctrlr->state != NVME_CTRLR_STATE_READY) {
    2385           0 :                 return;
    2386             :         }
    2387             : 
    2388           0 :         if (nvme_qpair_is_admin_queue(qpair)) {
    2389           0 :                 active_proc = nvme_ctrlr_get_current_process(ctrlr);
    2390             :         } else {
    2391           0 :                 active_proc = qpair->active_proc;
    2392             :         }
    2393             : 
    2394             :         /* Only check timeouts if the current process has a timeout callback. */
    2395           0 :         if (active_proc == NULL || active_proc->timeout_cb_fn == NULL) {
    2396           0 :                 return;
    2397             :         }
    2398             : 
    2399           0 :         t02 = spdk_get_ticks();
    2400           0 :         TAILQ_FOREACH_SAFE(rdma_req, &rqpair->outstanding_reqs, link, tmp) {
    2401           0 :                 assert(rdma_req->req != NULL);
    2402             : 
    2403           0 :                 if (nvme_request_check_timeout(rdma_req->req, rdma_req->id, active_proc, t02)) {
    2404             :                         /*
    2405             :                          * The requests are in order, so as soon as one has not timed out,
    2406             :                          * stop iterating.
    2407             :                          */
    2408           0 :                         break;
    2409             :                 }
    2410             :         }
    2411             : }
    2412             : 
    2413             : static inline void
    2414           0 : nvme_rdma_request_ready(struct nvme_rdma_qpair *rqpair, struct spdk_nvme_rdma_req *rdma_req)
    2415             : {
    2416           0 :         struct spdk_nvme_rdma_rsp *rdma_rsp = rdma_req->rdma_rsp;
    2417           0 :         struct ibv_recv_wr *recv_wr = rdma_rsp->recv_wr;
    2418             : 
    2419           0 :         nvme_rdma_req_complete(rdma_req, &rdma_rsp->cpl, true);
    2420             : 
    2421           0 :         assert(rqpair->rsps->current_num_recvs < rqpair->rsps->num_entries);
    2422           0 :         rqpair->rsps->current_num_recvs++;
    2423             : 
    2424           0 :         recv_wr->next = NULL;
    2425           0 :         nvme_rdma_trace_ibv_sge(recv_wr->sg_list);
    2426             : 
    2427           0 :         if (!rqpair->srq) {
    2428           0 :                 spdk_rdma_qp_queue_recv_wrs(rqpair->rdma_qp, recv_wr);
    2429             :         } else {
    2430           0 :                 spdk_rdma_srq_queue_recv_wrs(rqpair->srq, recv_wr);
    2431             :         }
    2432           0 : }
    2433             : 
    2434             : #define MAX_COMPLETIONS_PER_POLL 128
    2435             : 
    2436             : static void
    2437           0 : nvme_rdma_fail_qpair(struct spdk_nvme_qpair *qpair, int failure_reason)
    2438             : {
    2439           0 :         if (failure_reason == IBV_WC_RETRY_EXC_ERR) {
    2440           0 :                 qpair->transport_failure_reason = SPDK_NVME_QPAIR_FAILURE_REMOTE;
    2441           0 :         } else if (qpair->transport_failure_reason == SPDK_NVME_QPAIR_FAILURE_NONE) {
    2442           0 :                 qpair->transport_failure_reason = SPDK_NVME_QPAIR_FAILURE_UNKNOWN;
    2443             :         }
    2444             : 
    2445           0 :         nvme_ctrlr_disconnect_qpair(qpair);
    2446           0 : }
    2447             : 
    2448             : static struct nvme_rdma_qpair *
    2449           4 : get_rdma_qpair_from_wc(struct nvme_rdma_poll_group *group, struct ibv_wc *wc)
    2450             : {
    2451             :         struct spdk_nvme_qpair *qpair;
    2452             :         struct nvme_rdma_qpair *rqpair;
    2453             : 
    2454           5 :         STAILQ_FOREACH(qpair, &group->group.connected_qpairs, poll_group_stailq) {
    2455           2 :                 rqpair = nvme_rdma_qpair(qpair);
    2456           2 :                 if (NVME_RDMA_POLL_GROUP_CHECK_QPN(rqpair, wc->qp_num)) {
    2457           1 :                         return rqpair;
    2458             :                 }
    2459             :         }
    2460             : 
    2461           4 :         STAILQ_FOREACH(qpair, &group->group.disconnected_qpairs, poll_group_stailq) {
    2462           2 :                 rqpair = nvme_rdma_qpair(qpair);
    2463           2 :                 if (NVME_RDMA_POLL_GROUP_CHECK_QPN(rqpair, wc->qp_num)) {
    2464           1 :                         return rqpair;
    2465             :                 }
    2466             :         }
    2467             : 
    2468           2 :         return NULL;
    2469             : }
    2470             : 
    2471             : static inline void
    2472           0 : nvme_rdma_log_wc_status(struct nvme_rdma_qpair *rqpair, struct ibv_wc *wc)
    2473             : {
    2474           0 :         struct nvme_rdma_wr *rdma_wr = (struct nvme_rdma_wr *)wc->wr_id;
    2475             : 
    2476           0 :         if (wc->status == IBV_WC_WR_FLUSH_ERR) {
    2477             :                 /* If qpair is in ERR state, we will receive completions for all posted and not completed
    2478             :                  * Work Requests with IBV_WC_WR_FLUSH_ERR status. Don't log an error in that case */
    2479           0 :                 SPDK_DEBUGLOG(nvme, "WC error, qid %u, qp state %d, request 0x%lu type %d, status: (%d): %s\n",
    2480             :                               rqpair->qpair.id, rqpair->qpair.state, wc->wr_id, rdma_wr->type, wc->status,
    2481             :                               ibv_wc_status_str(wc->status));
    2482             :         } else {
    2483           0 :                 SPDK_ERRLOG("WC error, qid %u, qp state %d, request 0x%lu type %d, status: (%d): %s\n",
    2484             :                             rqpair->qpair.id, rqpair->qpair.state, wc->wr_id, rdma_wr->type, wc->status,
    2485             :                             ibv_wc_status_str(wc->status));
    2486             :         }
    2487           0 : }
    2488             : 
    2489             : static inline int
    2490           0 : nvme_rdma_process_recv_completion(struct nvme_rdma_poller *poller, struct ibv_wc *wc,
    2491             :                                   struct nvme_rdma_wr *rdma_wr)
    2492             : {
    2493             :         struct nvme_rdma_qpair          *rqpair;
    2494             :         struct spdk_nvme_rdma_req       *rdma_req;
    2495             :         struct spdk_nvme_rdma_rsp       *rdma_rsp;
    2496             : 
    2497           0 :         rdma_rsp = SPDK_CONTAINEROF(rdma_wr, struct spdk_nvme_rdma_rsp, rdma_wr);
    2498             : 
    2499           0 :         if (poller && poller->srq) {
    2500           0 :                 rqpair = get_rdma_qpair_from_wc(poller->group, wc);
    2501           0 :                 if (spdk_unlikely(!rqpair)) {
    2502             :                         /* Since we do not handle the LAST_WQE_REACHED event, we do not know when
    2503             :                          * a Receive Queue in a QP, that is associated with an SRQ, is flushed.
    2504             :                          * We may get a WC for a already destroyed QP.
    2505             :                          *
    2506             :                          * However, for the SRQ, this is not any error. Hence, just re-post the
    2507             :                          * receive request to the SRQ to reuse for other QPs, and return 0.
    2508             :                          */
    2509           0 :                         spdk_rdma_srq_queue_recv_wrs(poller->srq, rdma_rsp->recv_wr);
    2510           0 :                         return 0;
    2511             :                 }
    2512             :         } else {
    2513           0 :                 rqpair = rdma_rsp->rqpair;
    2514           0 :                 if (spdk_unlikely(!rqpair)) {
    2515             :                         /* TODO: Fix forceful QP destroy when it is not async mode.
    2516             :                          * CQ itself did not cause any error. Hence, return 0 for now.
    2517             :                          */
    2518           0 :                         SPDK_WARNLOG("QP might be already destroyed.\n");
    2519           0 :                         return 0;
    2520             :                 }
    2521             :         }
    2522             : 
    2523             : 
    2524           0 :         assert(rqpair->rsps->current_num_recvs > 0);
    2525           0 :         rqpair->rsps->current_num_recvs--;
    2526             : 
    2527           0 :         if (wc->status) {
    2528           0 :                 nvme_rdma_log_wc_status(rqpair, wc);
    2529           0 :                 goto err_wc;
    2530             :         }
    2531             : 
    2532           0 :         SPDK_DEBUGLOG(nvme, "CQ recv completion\n");
    2533             : 
    2534           0 :         if (wc->byte_len < sizeof(struct spdk_nvme_cpl)) {
    2535           0 :                 SPDK_ERRLOG("recv length %u less than expected response size\n", wc->byte_len);
    2536           0 :                 goto err_wc;
    2537             :         }
    2538           0 :         rdma_req = &rqpair->rdma_reqs[rdma_rsp->cpl.cid];
    2539           0 :         rdma_req->completion_flags |= NVME_RDMA_RECV_COMPLETED;
    2540           0 :         rdma_req->rdma_rsp = rdma_rsp;
    2541             : 
    2542           0 :         if ((rdma_req->completion_flags & NVME_RDMA_SEND_COMPLETED) == 0) {
    2543           0 :                 return 0;
    2544             :         }
    2545             : 
    2546           0 :         nvme_rdma_request_ready(rqpair, rdma_req);
    2547             : 
    2548           0 :         if (!rqpair->delay_cmd_submit) {
    2549           0 :                 if (spdk_unlikely(nvme_rdma_qpair_submit_recvs(rqpair))) {
    2550           0 :                         SPDK_ERRLOG("Unable to re-post rx descriptor\n");
    2551           0 :                         nvme_rdma_fail_qpair(&rqpair->qpair, 0);
    2552           0 :                         return -ENXIO;
    2553             :                 }
    2554             :         }
    2555             : 
    2556           0 :         rqpair->num_completions++;
    2557           0 :         return 1;
    2558             : 
    2559           0 : err_wc:
    2560           0 :         nvme_rdma_fail_qpair(&rqpair->qpair, 0);
    2561           0 :         if (poller && poller->srq) {
    2562           0 :                 spdk_rdma_srq_queue_recv_wrs(poller->srq, rdma_rsp->recv_wr);
    2563             :         }
    2564           0 :         return -ENXIO;
    2565             : }
    2566             : 
    2567             : static inline int
    2568           0 : nvme_rdma_process_send_completion(struct nvme_rdma_poller *poller,
    2569             :                                   struct nvme_rdma_qpair *rdma_qpair,
    2570             :                                   struct ibv_wc *wc, struct nvme_rdma_wr *rdma_wr)
    2571             : {
    2572             :         struct nvme_rdma_qpair          *rqpair;
    2573             :         struct spdk_nvme_rdma_req       *rdma_req;
    2574             : 
    2575           0 :         rdma_req = SPDK_CONTAINEROF(rdma_wr, struct spdk_nvme_rdma_req, rdma_wr);
    2576           0 :         rqpair = rdma_req->req ? nvme_rdma_qpair(rdma_req->req->qpair) : NULL;
    2577           0 :         if (!rqpair) {
    2578           0 :                 rqpair = rdma_qpair != NULL ? rdma_qpair : get_rdma_qpair_from_wc(poller->group, wc);
    2579             :         }
    2580             : 
    2581             :         /* If we are flushing I/O */
    2582           0 :         if (wc->status) {
    2583           0 :                 if (!rqpair) {
    2584             :                         /* When poll_group is used, several qpairs share the same CQ and it is possible to
    2585             :                          * receive a completion with error (e.g. IBV_WC_WR_FLUSH_ERR) for already disconnected qpair
    2586             :                          * That happens due to qpair is destroyed while there are submitted but not completed send/receive
    2587             :                          * Work Requests */
    2588           0 :                         assert(poller);
    2589           0 :                         return 0;
    2590             :                 }
    2591           0 :                 assert(rqpair->current_num_sends > 0);
    2592           0 :                 rqpair->current_num_sends--;
    2593           0 :                 nvme_rdma_log_wc_status(rqpair, wc);
    2594           0 :                 nvme_rdma_fail_qpair(&rqpair->qpair, 0);
    2595           0 :                 if (rdma_req->rdma_rsp && poller && poller->srq) {
    2596           0 :                         spdk_rdma_srq_queue_recv_wrs(poller->srq, rdma_req->rdma_rsp->recv_wr);
    2597             :                 }
    2598           0 :                 return -ENXIO;
    2599             :         }
    2600             : 
    2601             :         /* We do not support Soft Roce anymore. Other than Soft Roce's bug, we should not
    2602             :          * receive a completion without error status after qpair is disconnected/destroyed.
    2603             :          */
    2604           0 :         if (spdk_unlikely(rdma_req->req == NULL)) {
    2605             :                 /*
    2606             :                  * Some infiniband drivers do not guarantee the previous assumption after we
    2607             :                  * received a RDMA_CM_EVENT_DEVICE_REMOVAL event.
    2608             :                  */
    2609           0 :                 SPDK_ERRLOG("Received malformed completion: request 0x%"PRIx64" type %d\n", wc->wr_id,
    2610             :                             rdma_wr->type);
    2611           0 :                 if (!rqpair || !rqpair->need_destroy) {
    2612           0 :                         assert(0);
    2613             :                 }
    2614           0 :                 return -ENXIO;
    2615             :         }
    2616             : 
    2617           0 :         rdma_req->completion_flags |= NVME_RDMA_SEND_COMPLETED;
    2618           0 :         assert(rqpair->current_num_sends > 0);
    2619           0 :         rqpair->current_num_sends--;
    2620             : 
    2621           0 :         if ((rdma_req->completion_flags & NVME_RDMA_RECV_COMPLETED) == 0) {
    2622           0 :                 return 0;
    2623             :         }
    2624             : 
    2625           0 :         nvme_rdma_request_ready(rqpair, rdma_req);
    2626             : 
    2627           0 :         if (!rqpair->delay_cmd_submit) {
    2628           0 :                 if (spdk_unlikely(nvme_rdma_qpair_submit_recvs(rqpair))) {
    2629           0 :                         SPDK_ERRLOG("Unable to re-post rx descriptor\n");
    2630           0 :                         nvme_rdma_fail_qpair(&rqpair->qpair, 0);
    2631           0 :                         return -ENXIO;
    2632             :                 }
    2633             :         }
    2634             : 
    2635           0 :         rqpair->num_completions++;
    2636           0 :         return 1;
    2637             : }
    2638             : 
    2639             : static int
    2640           0 : nvme_rdma_cq_process_completions(struct ibv_cq *cq, uint32_t batch_size,
    2641             :                                  struct nvme_rdma_poller *poller,
    2642             :                                  struct nvme_rdma_qpair *rdma_qpair,
    2643             :                                  uint64_t *rdma_completions)
    2644             : {
    2645           0 :         struct ibv_wc                   wc[MAX_COMPLETIONS_PER_POLL];
    2646             :         struct nvme_rdma_wr             *rdma_wr;
    2647           0 :         uint32_t                        reaped = 0;
    2648           0 :         int                             completion_rc = 0;
    2649             :         int                             rc, _rc, i;
    2650             : 
    2651           0 :         rc = ibv_poll_cq(cq, batch_size, wc);
    2652           0 :         if (rc < 0) {
    2653           0 :                 SPDK_ERRLOG("Error polling CQ! (%d): %s\n",
    2654             :                             errno, spdk_strerror(errno));
    2655           0 :                 return -ECANCELED;
    2656           0 :         } else if (rc == 0) {
    2657           0 :                 return 0;
    2658             :         }
    2659             : 
    2660           0 :         for (i = 0; i < rc; i++) {
    2661           0 :                 rdma_wr = (struct nvme_rdma_wr *)wc[i].wr_id;
    2662           0 :                 switch (rdma_wr->type) {
    2663           0 :                 case RDMA_WR_TYPE_RECV:
    2664           0 :                         _rc = nvme_rdma_process_recv_completion(poller, &wc[i], rdma_wr);
    2665           0 :                         break;
    2666             : 
    2667           0 :                 case RDMA_WR_TYPE_SEND:
    2668           0 :                         _rc = nvme_rdma_process_send_completion(poller, rdma_qpair, &wc[i], rdma_wr);
    2669           0 :                         break;
    2670             : 
    2671           0 :                 default:
    2672           0 :                         SPDK_ERRLOG("Received an unexpected opcode on the CQ: %d\n", rdma_wr->type);
    2673           0 :                         return -ECANCELED;
    2674             :                 }
    2675           0 :                 if (spdk_likely(_rc >= 0)) {
    2676           0 :                         reaped += _rc;
    2677             :                 } else {
    2678           0 :                         completion_rc = _rc;
    2679             :                 }
    2680             :         }
    2681             : 
    2682           0 :         *rdma_completions += rc;
    2683             : 
    2684           0 :         if (completion_rc) {
    2685           0 :                 return completion_rc;
    2686             :         }
    2687             : 
    2688           0 :         return reaped;
    2689             : }
    2690             : 
    2691             : static void
    2692           0 : dummy_disconnected_qpair_cb(struct spdk_nvme_qpair *qpair, void *poll_group_ctx)
    2693             : {
    2694             : 
    2695           0 : }
    2696             : 
    2697             : static int
    2698           0 : nvme_rdma_qpair_process_completions(struct spdk_nvme_qpair *qpair,
    2699             :                                     uint32_t max_completions)
    2700             : {
    2701           0 :         struct nvme_rdma_qpair          *rqpair = nvme_rdma_qpair(qpair);
    2702           0 :         struct nvme_rdma_ctrlr          *rctrlr = nvme_rdma_ctrlr(qpair->ctrlr);
    2703           0 :         int                             rc = 0, batch_size;
    2704             :         struct ibv_cq                   *cq;
    2705           0 :         uint64_t                        rdma_completions = 0;
    2706             : 
    2707             :         /*
    2708             :          * This is used during the connection phase. It's possible that we are still reaping error completions
    2709             :          * from other qpairs so we need to call the poll group function. Also, it's more correct since the cq
    2710             :          * is shared.
    2711             :          */
    2712           0 :         if (qpair->poll_group != NULL) {
    2713           0 :                 return spdk_nvme_poll_group_process_completions(qpair->poll_group->group, max_completions,
    2714             :                                 dummy_disconnected_qpair_cb);
    2715             :         }
    2716             : 
    2717           0 :         if (max_completions == 0) {
    2718           0 :                 max_completions = rqpair->num_entries;
    2719             :         } else {
    2720           0 :                 max_completions = spdk_min(max_completions, rqpair->num_entries);
    2721             :         }
    2722             : 
    2723           0 :         switch (nvme_qpair_get_state(qpair)) {
    2724           0 :         case NVME_QPAIR_CONNECTING:
    2725           0 :                 rc = nvme_rdma_ctrlr_connect_qpair_poll(qpair->ctrlr, qpair);
    2726           0 :                 if (rc == 0) {
    2727             :                         /* Once the connection is completed, we can submit queued requests */
    2728           0 :                         nvme_qpair_resubmit_requests(qpair, rqpair->num_entries);
    2729           0 :                 } else if (rc != -EAGAIN) {
    2730           0 :                         SPDK_ERRLOG("Failed to connect rqpair=%p\n", rqpair);
    2731           0 :                         goto failed;
    2732           0 :                 } else if (rqpair->state <= NVME_RDMA_QPAIR_STATE_INITIALIZING) {
    2733           0 :                         return 0;
    2734             :                 }
    2735           0 :                 break;
    2736             : 
    2737           0 :         case NVME_QPAIR_DISCONNECTING:
    2738           0 :                 nvme_rdma_ctrlr_disconnect_qpair_poll(qpair->ctrlr, qpair);
    2739           0 :                 return -ENXIO;
    2740             : 
    2741           0 :         default:
    2742           0 :                 if (nvme_qpair_is_admin_queue(qpair)) {
    2743           0 :                         nvme_rdma_poll_events(rctrlr);
    2744             :                 }
    2745           0 :                 nvme_rdma_qpair_process_cm_event(rqpair);
    2746           0 :                 break;
    2747             :         }
    2748             : 
    2749           0 :         if (spdk_unlikely(qpair->transport_failure_reason != SPDK_NVME_QPAIR_FAILURE_NONE)) {
    2750           0 :                 goto failed;
    2751             :         }
    2752             : 
    2753           0 :         cq = rqpair->cq;
    2754             : 
    2755           0 :         rqpair->num_completions = 0;
    2756             :         do {
    2757           0 :                 batch_size = spdk_min((max_completions - rqpair->num_completions), MAX_COMPLETIONS_PER_POLL);
    2758           0 :                 rc = nvme_rdma_cq_process_completions(cq, batch_size, NULL, rqpair, &rdma_completions);
    2759             : 
    2760           0 :                 if (rc == 0) {
    2761           0 :                         break;
    2762             :                         /* Handle the case where we fail to poll the cq. */
    2763           0 :                 } else if (rc == -ECANCELED) {
    2764           0 :                         goto failed;
    2765           0 :                 } else if (rc == -ENXIO) {
    2766           0 :                         return rc;
    2767             :                 }
    2768           0 :         } while (rqpair->num_completions < max_completions);
    2769             : 
    2770           0 :         if (spdk_unlikely(nvme_rdma_qpair_submit_sends(rqpair) ||
    2771             :                           nvme_rdma_qpair_submit_recvs(rqpair))) {
    2772           0 :                 goto failed;
    2773             :         }
    2774             : 
    2775           0 :         if (spdk_unlikely(qpair->ctrlr->timeout_enabled)) {
    2776           0 :                 nvme_rdma_qpair_check_timeout(qpair);
    2777             :         }
    2778             : 
    2779           0 :         return rqpair->num_completions;
    2780             : 
    2781           0 : failed:
    2782           0 :         nvme_rdma_fail_qpair(qpair, 0);
    2783           0 :         return -ENXIO;
    2784             : }
    2785             : 
    2786             : static uint32_t
    2787           0 : nvme_rdma_ctrlr_get_max_xfer_size(struct spdk_nvme_ctrlr *ctrlr)
    2788             : {
    2789             :         /* max_mr_size by ibv_query_device indicates the largest value that we can
    2790             :          * set for a registered memory region.  It is independent from the actual
    2791             :          * I/O size and is very likely to be larger than 2 MiB which is the
    2792             :          * granularity we currently register memory regions.  Hence return
    2793             :          * UINT32_MAX here and let the generic layer use the controller data to
    2794             :          * moderate this value.
    2795             :          */
    2796           0 :         return UINT32_MAX;
    2797             : }
    2798             : 
    2799             : static uint16_t
    2800           5 : nvme_rdma_ctrlr_get_max_sges(struct spdk_nvme_ctrlr *ctrlr)
    2801             : {
    2802           5 :         struct nvme_rdma_ctrlr *rctrlr = nvme_rdma_ctrlr(ctrlr);
    2803           5 :         uint32_t max_sge = rctrlr->max_sge;
    2804           5 :         uint32_t max_in_capsule_sge = (ctrlr->cdata.nvmf_specific.ioccsz * 16 -
    2805           5 :                                        sizeof(struct spdk_nvme_cmd)) /
    2806             :                                       sizeof(struct spdk_nvme_sgl_descriptor);
    2807             : 
    2808             :         /* Max SGE is limited by capsule size */
    2809           5 :         max_sge = spdk_min(max_sge, max_in_capsule_sge);
    2810             :         /* Max SGE may be limited by MSDBD */
    2811           5 :         if (ctrlr->cdata.nvmf_specific.msdbd != 0) {
    2812           5 :                 max_sge = spdk_min(max_sge, ctrlr->cdata.nvmf_specific.msdbd);
    2813             :         }
    2814             : 
    2815             :         /* Max SGE can't be less than 1 */
    2816           5 :         max_sge = spdk_max(1, max_sge);
    2817           5 :         return max_sge;
    2818             : }
    2819             : 
    2820             : static int
    2821           0 : nvme_rdma_qpair_iterate_requests(struct spdk_nvme_qpair *qpair,
    2822             :                                  int (*iter_fn)(struct nvme_request *req, void *arg),
    2823             :                                  void *arg)
    2824             : {
    2825           0 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    2826             :         struct spdk_nvme_rdma_req *rdma_req, *tmp;
    2827             :         int rc;
    2828             : 
    2829           0 :         assert(iter_fn != NULL);
    2830             : 
    2831           0 :         TAILQ_FOREACH_SAFE(rdma_req, &rqpair->outstanding_reqs, link, tmp) {
    2832           0 :                 assert(rdma_req->req != NULL);
    2833             : 
    2834           0 :                 rc = iter_fn(rdma_req->req, arg);
    2835           0 :                 if (rc != 0) {
    2836           0 :                         return rc;
    2837             :                 }
    2838             :         }
    2839             : 
    2840           0 :         return 0;
    2841             : }
    2842             : 
    2843             : static void
    2844           0 : nvme_rdma_admin_qpair_abort_aers(struct spdk_nvme_qpair *qpair)
    2845             : {
    2846             :         struct spdk_nvme_rdma_req *rdma_req, *tmp;
    2847           0 :         struct spdk_nvme_cpl cpl;
    2848           0 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    2849             : 
    2850           0 :         cpl.status.sc = SPDK_NVME_SC_ABORTED_SQ_DELETION;
    2851           0 :         cpl.status.sct = SPDK_NVME_SCT_GENERIC;
    2852             : 
    2853           0 :         TAILQ_FOREACH_SAFE(rdma_req, &rqpair->outstanding_reqs, link, tmp) {
    2854           0 :                 assert(rdma_req->req != NULL);
    2855             : 
    2856           0 :                 if (rdma_req->req->cmd.opc != SPDK_NVME_OPC_ASYNC_EVENT_REQUEST) {
    2857           0 :                         continue;
    2858             :                 }
    2859             : 
    2860           0 :                 nvme_rdma_req_complete(rdma_req, &cpl, false);
    2861             :         }
    2862           0 : }
    2863             : 
    2864             : static void
    2865           9 : nvme_rdma_poller_destroy(struct nvme_rdma_poller *poller)
    2866             : {
    2867           9 :         if (poller->cq) {
    2868           7 :                 ibv_destroy_cq(poller->cq);
    2869             :         }
    2870           9 :         if (poller->rsps) {
    2871           0 :                 nvme_rdma_free_rsps(poller->rsps);
    2872             :         }
    2873           9 :         if (poller->srq) {
    2874           0 :                 spdk_rdma_srq_destroy(poller->srq);
    2875             :         }
    2876           9 :         if (poller->mr_map) {
    2877           0 :                 spdk_rdma_free_mem_map(&poller->mr_map);
    2878             :         }
    2879           9 :         if (poller->pd) {
    2880           0 :                 spdk_rdma_put_pd(poller->pd);
    2881             :         }
    2882           9 :         free(poller);
    2883           9 : }
    2884             : 
    2885             : static struct nvme_rdma_poller *
    2886           9 : nvme_rdma_poller_create(struct nvme_rdma_poll_group *group, struct ibv_context *ctx)
    2887             : {
    2888             :         struct nvme_rdma_poller *poller;
    2889           9 :         struct ibv_device_attr dev_attr;
    2890           9 :         struct spdk_rdma_srq_init_attr srq_init_attr = {};
    2891           9 :         struct nvme_rdma_rsp_opts opts;
    2892             :         int num_cqe, max_num_cqe;
    2893             :         int rc;
    2894             : 
    2895           9 :         poller = calloc(1, sizeof(*poller));
    2896           9 :         if (poller == NULL) {
    2897           0 :                 SPDK_ERRLOG("Unable to allocate poller.\n");
    2898           0 :                 return NULL;
    2899             :         }
    2900             : 
    2901           9 :         poller->group = group;
    2902           9 :         poller->device = ctx;
    2903             : 
    2904           9 :         if (g_spdk_nvme_transport_opts.rdma_srq_size != 0) {
    2905           0 :                 rc = ibv_query_device(ctx, &dev_attr);
    2906           0 :                 if (rc) {
    2907           0 :                         SPDK_ERRLOG("Unable to query RDMA device.\n");
    2908           0 :                         goto fail;
    2909             :                 }
    2910             : 
    2911           0 :                 poller->pd = spdk_rdma_get_pd(ctx);
    2912           0 :                 if (poller->pd == NULL) {
    2913           0 :                         SPDK_ERRLOG("Unable to get PD.\n");
    2914           0 :                         goto fail;
    2915             :                 }
    2916             : 
    2917           0 :                 poller->mr_map = spdk_rdma_create_mem_map(poller->pd, &g_nvme_hooks,
    2918             :                                  SPDK_RDMA_MEMORY_MAP_ROLE_INITIATOR);
    2919           0 :                 if (poller->mr_map == NULL) {
    2920           0 :                         SPDK_ERRLOG("Unable to create memory map.\n");
    2921           0 :                         goto fail;
    2922             :                 }
    2923             : 
    2924           0 :                 srq_init_attr.stats = &poller->stats.rdma_stats.recv;
    2925           0 :                 srq_init_attr.pd = poller->pd;
    2926           0 :                 srq_init_attr.srq_init_attr.attr.max_wr = spdk_min((uint32_t)dev_attr.max_srq_wr,
    2927             :                                 g_spdk_nvme_transport_opts.rdma_srq_size);
    2928           0 :                 srq_init_attr.srq_init_attr.attr.max_sge = spdk_min(dev_attr.max_sge,
    2929             :                                 NVME_RDMA_DEFAULT_RX_SGE);
    2930             : 
    2931           0 :                 poller->srq = spdk_rdma_srq_create(&srq_init_attr);
    2932           0 :                 if (poller->srq == NULL) {
    2933           0 :                         SPDK_ERRLOG("Unable to create SRQ.\n");
    2934           0 :                         goto fail;
    2935             :                 }
    2936             : 
    2937           0 :                 opts.num_entries = g_spdk_nvme_transport_opts.rdma_srq_size;
    2938           0 :                 opts.rqpair = NULL;
    2939           0 :                 opts.srq = poller->srq;
    2940           0 :                 opts.mr_map = poller->mr_map;
    2941             : 
    2942           0 :                 poller->rsps = nvme_rdma_create_rsps(&opts);
    2943           0 :                 if (poller->rsps == NULL) {
    2944           0 :                         SPDK_ERRLOG("Unable to create poller RDMA responses.\n");
    2945           0 :                         goto fail;
    2946             :                 }
    2947             : 
    2948           0 :                 rc = nvme_rdma_poller_submit_recvs(poller);
    2949           0 :                 if (rc) {
    2950           0 :                         SPDK_ERRLOG("Unable to submit poller RDMA responses.\n");
    2951           0 :                         goto fail;
    2952             :                 }
    2953             : 
    2954             :                 /*
    2955             :                  * When using an srq, fix the size of the completion queue at startup.
    2956             :                  * The initiator sends only send and recv WRs. Hence, the multiplier is 2.
    2957             :                  * (The target sends also data WRs. Hence, the multiplier is 3.)
    2958             :                  */
    2959           0 :                 num_cqe = g_spdk_nvme_transport_opts.rdma_srq_size * 2;
    2960             :         } else {
    2961           9 :                 num_cqe = DEFAULT_NVME_RDMA_CQ_SIZE;
    2962             :         }
    2963             : 
    2964           9 :         max_num_cqe = g_spdk_nvme_transport_opts.rdma_max_cq_size;
    2965           9 :         if (max_num_cqe != 0 && num_cqe > max_num_cqe) {
    2966           0 :                 num_cqe = max_num_cqe;
    2967             :         }
    2968             : 
    2969           9 :         poller->cq = ibv_create_cq(poller->device, num_cqe, group, NULL, 0);
    2970             : 
    2971           9 :         if (poller->cq == NULL) {
    2972           2 :                 SPDK_ERRLOG("Unable to create CQ, errno %d.\n", errno);
    2973           2 :                 goto fail;
    2974             :         }
    2975             : 
    2976           7 :         STAILQ_INSERT_HEAD(&group->pollers, poller, link);
    2977           7 :         group->num_pollers++;
    2978           7 :         poller->current_num_wc = num_cqe;
    2979           7 :         poller->required_num_wc = 0;
    2980           7 :         return poller;
    2981             : 
    2982           2 : fail:
    2983           2 :         nvme_rdma_poller_destroy(poller);
    2984           2 :         return NULL;
    2985             : }
    2986             : 
    2987             : static void
    2988           3 : nvme_rdma_poll_group_free_pollers(struct nvme_rdma_poll_group *group)
    2989             : {
    2990             :         struct nvme_rdma_poller *poller, *tmp_poller;
    2991             : 
    2992           5 :         STAILQ_FOREACH_SAFE(poller, &group->pollers, link, tmp_poller) {
    2993           2 :                 assert(poller->refcnt == 0);
    2994           2 :                 if (poller->refcnt) {
    2995           0 :                         SPDK_WARNLOG("Destroying poller with non-zero ref count: poller %p, refcnt %d\n",
    2996             :                                      poller, poller->refcnt);
    2997             :                 }
    2998             : 
    2999           2 :                 STAILQ_REMOVE(&group->pollers, poller, nvme_rdma_poller, link);
    3000           2 :                 nvme_rdma_poller_destroy(poller);
    3001             :         }
    3002           3 : }
    3003             : 
    3004             : static struct nvme_rdma_poller *
    3005           8 : nvme_rdma_poll_group_get_poller(struct nvme_rdma_poll_group *group, struct ibv_context *device)
    3006             : {
    3007           8 :         struct nvme_rdma_poller *poller = NULL;
    3008             : 
    3009          10 :         STAILQ_FOREACH(poller, &group->pollers, link) {
    3010           3 :                 if (poller->device == device) {
    3011           1 :                         break;
    3012             :                 }
    3013             :         }
    3014             : 
    3015           8 :         if (!poller) {
    3016           7 :                 poller = nvme_rdma_poller_create(group, device);
    3017           7 :                 if (!poller) {
    3018           2 :                         SPDK_ERRLOG("Failed to create a poller for device %p\n", device);
    3019           2 :                         return NULL;
    3020             :                 }
    3021             :         }
    3022             : 
    3023           6 :         poller->refcnt++;
    3024           6 :         return poller;
    3025             : }
    3026             : 
    3027             : static void
    3028           6 : nvme_rdma_poll_group_put_poller(struct nvme_rdma_poll_group *group, struct nvme_rdma_poller *poller)
    3029             : {
    3030           6 :         assert(poller->refcnt > 0);
    3031           6 :         if (--poller->refcnt == 0) {
    3032           5 :                 STAILQ_REMOVE(&group->pollers, poller, nvme_rdma_poller, link);
    3033           5 :                 group->num_pollers--;
    3034           5 :                 nvme_rdma_poller_destroy(poller);
    3035             :         }
    3036           6 : }
    3037             : 
    3038             : static struct spdk_nvme_transport_poll_group *
    3039           1 : nvme_rdma_poll_group_create(void)
    3040             : {
    3041             :         struct nvme_rdma_poll_group     *group;
    3042             : 
    3043           1 :         group = calloc(1, sizeof(*group));
    3044           1 :         if (group == NULL) {
    3045           0 :                 SPDK_ERRLOG("Unable to allocate poll group.\n");
    3046           0 :                 return NULL;
    3047             :         }
    3048             : 
    3049           1 :         STAILQ_INIT(&group->pollers);
    3050           1 :         TAILQ_INIT(&group->connecting_qpairs);
    3051           1 :         return &group->group;
    3052             : }
    3053             : 
    3054             : static int
    3055           0 : nvme_rdma_poll_group_connect_qpair(struct spdk_nvme_qpair *qpair)
    3056             : {
    3057           0 :         return 0;
    3058             : }
    3059             : 
    3060             : static int
    3061           0 : nvme_rdma_poll_group_disconnect_qpair(struct spdk_nvme_qpair *qpair)
    3062             : {
    3063           0 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    3064           0 :         struct nvme_rdma_poll_group *group = nvme_rdma_poll_group(qpair->poll_group);;
    3065             : 
    3066           0 :         if (rqpair->link_connecting.tqe_prev) {
    3067           0 :                 TAILQ_REMOVE(&group->connecting_qpairs, rqpair, link_connecting);
    3068             :                 /* We use prev pointer to check if qpair is in connecting list or not .
    3069             :                  * TAILQ_REMOVE doesn't do it. So, we do it manually.
    3070             :                  */
    3071           0 :                 rqpair->link_connecting.tqe_prev = NULL;
    3072             :         }
    3073             : 
    3074           0 :         return 0;
    3075             : }
    3076             : 
    3077             : static int
    3078           0 : nvme_rdma_poll_group_add(struct spdk_nvme_transport_poll_group *tgroup,
    3079             :                          struct spdk_nvme_qpair *qpair)
    3080             : {
    3081           0 :         return 0;
    3082             : }
    3083             : 
    3084             : static int
    3085           0 : nvme_rdma_poll_group_remove(struct spdk_nvme_transport_poll_group *tgroup,
    3086             :                             struct spdk_nvme_qpair *qpair)
    3087             : {
    3088           0 :         return 0;
    3089             : }
    3090             : 
    3091             : static inline void
    3092           0 : nvme_rdma_qpair_process_submits(struct spdk_nvme_qpair *qpair)
    3093             : {
    3094           0 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    3095             : 
    3096           0 :         if (spdk_unlikely(rqpair->state <= NVME_RDMA_QPAIR_STATE_INITIALIZING)) {
    3097           0 :                 return;
    3098             :         }
    3099             : 
    3100           0 :         if (spdk_unlikely(qpair->ctrlr->timeout_enabled)) {
    3101           0 :                 nvme_rdma_qpair_check_timeout(qpair);
    3102             :         }
    3103             : 
    3104           0 :         nvme_rdma_qpair_submit_sends(rqpair);
    3105           0 :         if (!rqpair->srq) {
    3106           0 :                 nvme_rdma_qpair_submit_recvs(rqpair);
    3107             :         }
    3108           0 :         if (rqpair->num_completions > 0) {
    3109           0 :                 nvme_qpair_resubmit_requests(qpair, rqpair->num_completions);
    3110           0 :                 rqpair->num_completions = 0;
    3111             :         }
    3112             : }
    3113             : 
    3114             : static int64_t
    3115           0 : nvme_rdma_poll_group_process_completions(struct spdk_nvme_transport_poll_group *tgroup,
    3116             :                 uint32_t completions_per_qpair, spdk_nvme_disconnected_qpair_cb disconnected_qpair_cb)
    3117             : {
    3118             :         struct spdk_nvme_qpair                  *qpair, *tmp_qpair;
    3119             :         struct nvme_rdma_qpair                  *rqpair, *tmp_rqpair;
    3120             :         struct nvme_rdma_poll_group             *group;
    3121             :         struct nvme_rdma_poller                 *poller;
    3122           0 :         int                                     batch_size, rc, rc2 = 0;
    3123           0 :         int64_t                                 total_completions = 0;
    3124           0 :         uint64_t                                completions_allowed = 0;
    3125           0 :         uint64_t                                completions_per_poller = 0;
    3126           0 :         uint64_t                                poller_completions = 0;
    3127           0 :         uint64_t                                rdma_completions;
    3128             : 
    3129           0 :         if (completions_per_qpair == 0) {
    3130           0 :                 completions_per_qpair = MAX_COMPLETIONS_PER_POLL;
    3131             :         }
    3132             : 
    3133           0 :         group = nvme_rdma_poll_group(tgroup);
    3134             : 
    3135           0 :         STAILQ_FOREACH_SAFE(qpair, &tgroup->disconnected_qpairs, poll_group_stailq, tmp_qpair) {
    3136           0 :                 rc = nvme_rdma_ctrlr_disconnect_qpair_poll(qpair->ctrlr, qpair);
    3137           0 :                 if (rc == 0) {
    3138           0 :                         disconnected_qpair_cb(qpair, tgroup->group->ctx);
    3139             :                 }
    3140             :         }
    3141             : 
    3142           0 :         TAILQ_FOREACH_SAFE(rqpair, &group->connecting_qpairs, link_connecting, tmp_rqpair) {
    3143           0 :                 qpair = &rqpair->qpair;
    3144             : 
    3145           0 :                 rc = nvme_rdma_ctrlr_connect_qpair_poll(qpair->ctrlr, qpair);
    3146           0 :                 if (rc == 0 || rc != -EAGAIN) {
    3147           0 :                         TAILQ_REMOVE(&group->connecting_qpairs, rqpair, link_connecting);
    3148             :                         /* We use prev pointer to check if qpair is in connecting list or not.
    3149             :                          * TAILQ_REMOVE does not do it. So, we do it manually.
    3150             :                          */
    3151           0 :                         rqpair->link_connecting.tqe_prev = NULL;
    3152             : 
    3153           0 :                         if (rc == 0) {
    3154             :                                 /* Once the connection is completed, we can submit queued requests */
    3155           0 :                                 nvme_qpair_resubmit_requests(qpair, rqpair->num_entries);
    3156           0 :                         } else if (rc != -EAGAIN) {
    3157           0 :                                 SPDK_ERRLOG("Failed to connect rqpair=%p\n", rqpair);
    3158           0 :                                 nvme_rdma_fail_qpair(qpair, 0);
    3159             :                         }
    3160             :                 }
    3161             :         }
    3162             : 
    3163           0 :         STAILQ_FOREACH_SAFE(qpair, &tgroup->connected_qpairs, poll_group_stailq, tmp_qpair) {
    3164           0 :                 rqpair = nvme_rdma_qpair(qpair);
    3165             : 
    3166           0 :                 if (spdk_likely(nvme_qpair_get_state(qpair) != NVME_QPAIR_CONNECTING)) {
    3167           0 :                         nvme_rdma_qpair_process_cm_event(rqpair);
    3168             :                 }
    3169             : 
    3170           0 :                 if (spdk_unlikely(qpair->transport_failure_reason != SPDK_NVME_QPAIR_FAILURE_NONE)) {
    3171           0 :                         rc2 = -ENXIO;
    3172           0 :                         nvme_rdma_fail_qpair(qpair, 0);
    3173             :                 }
    3174             :         }
    3175             : 
    3176           0 :         completions_allowed = completions_per_qpair * tgroup->num_connected_qpairs;
    3177           0 :         if (group->num_pollers) {
    3178           0 :                 completions_per_poller = spdk_max(completions_allowed / group->num_pollers, 1);
    3179             :         }
    3180             : 
    3181           0 :         STAILQ_FOREACH(poller, &group->pollers, link) {
    3182           0 :                 poller_completions = 0;
    3183           0 :                 rdma_completions = 0;
    3184             :                 do {
    3185           0 :                         poller->stats.polls++;
    3186           0 :                         batch_size = spdk_min((completions_per_poller - poller_completions), MAX_COMPLETIONS_PER_POLL);
    3187           0 :                         rc = nvme_rdma_cq_process_completions(poller->cq, batch_size, poller, NULL, &rdma_completions);
    3188           0 :                         if (rc <= 0) {
    3189           0 :                                 if (rc == -ECANCELED) {
    3190           0 :                                         return -EIO;
    3191           0 :                                 } else if (rc == 0) {
    3192           0 :                                         poller->stats.idle_polls++;
    3193             :                                 }
    3194           0 :                                 break;
    3195             :                         }
    3196             : 
    3197           0 :                         poller_completions += rc;
    3198           0 :                 } while (poller_completions < completions_per_poller);
    3199           0 :                 total_completions += poller_completions;
    3200           0 :                 poller->stats.completions += rdma_completions;
    3201           0 :                 if (poller->srq) {
    3202           0 :                         nvme_rdma_poller_submit_recvs(poller);
    3203             :                 }
    3204             :         }
    3205             : 
    3206           0 :         STAILQ_FOREACH_SAFE(qpair, &tgroup->connected_qpairs, poll_group_stailq, tmp_qpair) {
    3207           0 :                 nvme_rdma_qpair_process_submits(qpair);
    3208             :         }
    3209             : 
    3210           0 :         return rc2 != 0 ? rc2 : total_completions;
    3211             : }
    3212             : 
    3213             : static int
    3214           1 : nvme_rdma_poll_group_destroy(struct spdk_nvme_transport_poll_group *tgroup)
    3215             : {
    3216           1 :         struct nvme_rdma_poll_group     *group = nvme_rdma_poll_group(tgroup);
    3217             : 
    3218           1 :         if (!STAILQ_EMPTY(&tgroup->connected_qpairs) || !STAILQ_EMPTY(&tgroup->disconnected_qpairs)) {
    3219           0 :                 return -EBUSY;
    3220             :         }
    3221             : 
    3222           1 :         nvme_rdma_poll_group_free_pollers(group);
    3223           1 :         free(group);
    3224             : 
    3225           1 :         return 0;
    3226             : }
    3227             : 
    3228             : static int
    3229           3 : nvme_rdma_poll_group_get_stats(struct spdk_nvme_transport_poll_group *tgroup,
    3230             :                                struct spdk_nvme_transport_poll_group_stat **_stats)
    3231             : {
    3232             :         struct nvme_rdma_poll_group *group;
    3233             :         struct spdk_nvme_transport_poll_group_stat *stats;
    3234             :         struct spdk_nvme_rdma_device_stat *device_stat;
    3235             :         struct nvme_rdma_poller *poller;
    3236           3 :         uint32_t i = 0;
    3237             : 
    3238           3 :         if (tgroup == NULL || _stats == NULL) {
    3239           2 :                 SPDK_ERRLOG("Invalid stats or group pointer\n");
    3240           2 :                 return -EINVAL;
    3241             :         }
    3242             : 
    3243           1 :         group = nvme_rdma_poll_group(tgroup);
    3244           1 :         stats = calloc(1, sizeof(*stats));
    3245           1 :         if (!stats) {
    3246           0 :                 SPDK_ERRLOG("Can't allocate memory for RDMA stats\n");
    3247           0 :                 return -ENOMEM;
    3248             :         }
    3249           1 :         stats->trtype = SPDK_NVME_TRANSPORT_RDMA;
    3250           1 :         stats->rdma.num_devices = group->num_pollers;
    3251             : 
    3252           1 :         if (stats->rdma.num_devices == 0) {
    3253           0 :                 *_stats = stats;
    3254           0 :                 return 0;
    3255             :         }
    3256             : 
    3257           1 :         stats->rdma.device_stats = calloc(stats->rdma.num_devices, sizeof(*stats->rdma.device_stats));
    3258           1 :         if (!stats->rdma.device_stats) {
    3259           0 :                 SPDK_ERRLOG("Can't allocate memory for RDMA device stats\n");
    3260           0 :                 free(stats);
    3261           0 :                 return -ENOMEM;
    3262             :         }
    3263             : 
    3264           3 :         STAILQ_FOREACH(poller, &group->pollers, link) {
    3265           2 :                 device_stat = &stats->rdma.device_stats[i];
    3266           2 :                 device_stat->name = poller->device->device->name;
    3267           2 :                 device_stat->polls = poller->stats.polls;
    3268           2 :                 device_stat->idle_polls = poller->stats.idle_polls;
    3269           2 :                 device_stat->completions = poller->stats.completions;
    3270           2 :                 device_stat->queued_requests = poller->stats.queued_requests;
    3271           2 :                 device_stat->total_send_wrs = poller->stats.rdma_stats.send.num_submitted_wrs;
    3272           2 :                 device_stat->send_doorbell_updates = poller->stats.rdma_stats.send.doorbell_updates;
    3273           2 :                 device_stat->total_recv_wrs = poller->stats.rdma_stats.recv.num_submitted_wrs;
    3274           2 :                 device_stat->recv_doorbell_updates = poller->stats.rdma_stats.recv.doorbell_updates;
    3275           2 :                 i++;
    3276             :         }
    3277             : 
    3278           1 :         *_stats = stats;
    3279             : 
    3280           1 :         return 0;
    3281             : }
    3282             : 
    3283             : static void
    3284           1 : nvme_rdma_poll_group_free_stats(struct spdk_nvme_transport_poll_group *tgroup,
    3285             :                                 struct spdk_nvme_transport_poll_group_stat *stats)
    3286             : {
    3287           1 :         if (stats) {
    3288           1 :                 free(stats->rdma.device_stats);
    3289             :         }
    3290           1 :         free(stats);
    3291           1 : }
    3292             : 
    3293             : static int
    3294           4 : nvme_rdma_ctrlr_get_memory_domains(const struct spdk_nvme_ctrlr *ctrlr,
    3295             :                                    struct spdk_memory_domain **domains, int array_size)
    3296             : {
    3297           4 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(ctrlr->adminq);
    3298             : 
    3299           4 :         if (domains && array_size > 0) {
    3300           1 :                 domains[0] = rqpair->memory_domain->domain;
    3301             :         }
    3302             : 
    3303           4 :         return 1;
    3304             : }
    3305             : 
    3306             : void
    3307           0 : spdk_nvme_rdma_init_hooks(struct spdk_nvme_rdma_hooks *hooks)
    3308             : {
    3309           0 :         g_nvme_hooks = *hooks;
    3310           0 : }
    3311             : 
    3312             : const struct spdk_nvme_transport_ops rdma_ops = {
    3313             :         .name = "RDMA",
    3314             :         .type = SPDK_NVME_TRANSPORT_RDMA,
    3315             :         .ctrlr_construct = nvme_rdma_ctrlr_construct,
    3316             :         .ctrlr_scan = nvme_fabric_ctrlr_scan,
    3317             :         .ctrlr_destruct = nvme_rdma_ctrlr_destruct,
    3318             :         .ctrlr_enable = nvme_rdma_ctrlr_enable,
    3319             : 
    3320             :         .ctrlr_set_reg_4 = nvme_fabric_ctrlr_set_reg_4,
    3321             :         .ctrlr_set_reg_8 = nvme_fabric_ctrlr_set_reg_8,
    3322             :         .ctrlr_get_reg_4 = nvme_fabric_ctrlr_get_reg_4,
    3323             :         .ctrlr_get_reg_8 = nvme_fabric_ctrlr_get_reg_8,
    3324             :         .ctrlr_set_reg_4_async = nvme_fabric_ctrlr_set_reg_4_async,
    3325             :         .ctrlr_set_reg_8_async = nvme_fabric_ctrlr_set_reg_8_async,
    3326             :         .ctrlr_get_reg_4_async = nvme_fabric_ctrlr_get_reg_4_async,
    3327             :         .ctrlr_get_reg_8_async = nvme_fabric_ctrlr_get_reg_8_async,
    3328             : 
    3329             :         .ctrlr_get_max_xfer_size = nvme_rdma_ctrlr_get_max_xfer_size,
    3330             :         .ctrlr_get_max_sges = nvme_rdma_ctrlr_get_max_sges,
    3331             : 
    3332             :         .ctrlr_create_io_qpair = nvme_rdma_ctrlr_create_io_qpair,
    3333             :         .ctrlr_delete_io_qpair = nvme_rdma_ctrlr_delete_io_qpair,
    3334             :         .ctrlr_connect_qpair = nvme_rdma_ctrlr_connect_qpair,
    3335             :         .ctrlr_disconnect_qpair = nvme_rdma_ctrlr_disconnect_qpair,
    3336             : 
    3337             :         .ctrlr_get_memory_domains = nvme_rdma_ctrlr_get_memory_domains,
    3338             : 
    3339             :         .qpair_abort_reqs = nvme_rdma_qpair_abort_reqs,
    3340             :         .qpair_reset = nvme_rdma_qpair_reset,
    3341             :         .qpair_submit_request = nvme_rdma_qpair_submit_request,
    3342             :         .qpair_process_completions = nvme_rdma_qpair_process_completions,
    3343             :         .qpair_iterate_requests = nvme_rdma_qpair_iterate_requests,
    3344             :         .admin_qpair_abort_aers = nvme_rdma_admin_qpair_abort_aers,
    3345             : 
    3346             :         .poll_group_create = nvme_rdma_poll_group_create,
    3347             :         .poll_group_connect_qpair = nvme_rdma_poll_group_connect_qpair,
    3348             :         .poll_group_disconnect_qpair = nvme_rdma_poll_group_disconnect_qpair,
    3349             :         .poll_group_add = nvme_rdma_poll_group_add,
    3350             :         .poll_group_remove = nvme_rdma_poll_group_remove,
    3351             :         .poll_group_process_completions = nvme_rdma_poll_group_process_completions,
    3352             :         .poll_group_destroy = nvme_rdma_poll_group_destroy,
    3353             :         .poll_group_get_stats = nvme_rdma_poll_group_get_stats,
    3354             :         .poll_group_free_stats = nvme_rdma_poll_group_free_stats,
    3355             : };
    3356             : 
    3357           1 : SPDK_NVME_TRANSPORT_REGISTER(rdma, &rdma_ops);

Generated by: LCOV version 1.15