LCOV - code coverage report
Current view: top level - lib/nvme - nvme_rdma.c (source / functions) Hit Total Coverage
Test: ut_cov_unit.info Lines: 673 1521 44.2 %
Date: 2024-07-11 07:54:50 Functions: 44 88 50.0 %

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

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