LCOV - code coverage report
Current view: top level - include/spdk - nvmf_transport.h (source / functions) Hit Total Coverage
Test: ut_cov_unit.info Lines: 21 24 87.5 %
Date: 2024-07-15 11:38:46 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*   SPDX-License-Identifier: BSD-3-Clause
       2             :  *   Copyright (C) 2020 Intel Corporation. All rights reserved.
       3             :  *   Copyright (c) 2019, 2021 Mellanox Technologies LTD. All rights reserved.
       4             :  */
       5             : 
       6             : /** \file
       7             :  * NVMe-oF Target transport plugin API
       8             :  */
       9             : 
      10             : #ifndef SPDK_NVMF_TRANSPORT_H_
      11             : #define SPDK_NVMF_TRANSPORT_H_
      12             : 
      13             : #include "spdk/bdev.h"
      14             : #include "spdk/thread.h"
      15             : #include "spdk/nvme_spec.h"
      16             : #include "spdk/nvmf.h"
      17             : #include "spdk/nvmf_cmd.h"
      18             : #include "spdk/nvmf_spec.h"
      19             : #include "spdk/memory.h"
      20             : #include "spdk/trace.h"
      21             : 
      22             : #ifdef __cplusplus
      23             : extern "C" {
      24             : #endif
      25             : 
      26             : #define SPDK_NVMF_MAX_SGL_ENTRIES       16
      27             : 
      28             : /* The maximum number of buffers per request */
      29             : #define NVMF_REQ_MAX_BUFFERS    (SPDK_NVMF_MAX_SGL_ENTRIES * 2 + 1)
      30             : 
      31             : /* Maximum pending AERs that can be migrated */
      32             : #define SPDK_NVMF_MIGR_MAX_PENDING_AERS 256
      33             : 
      34             : #define SPDK_NVMF_MAX_ASYNC_EVENTS 4
      35             : 
      36             : /* Some backends require 4K aligned buffers. The iobuf library gives us that
      37             :  * naturally, but there are buffers allocated other ways that need to use this.
      38             :  */
      39             : #define NVMF_DATA_BUFFER_ALIGNMENT      VALUE_4KB
      40             : #define NVMF_DATA_BUFFER_MASK           (NVMF_DATA_BUFFER_ALIGNMENT - 1LL)
      41             : 
      42             : #define SPDK_NVMF_DEFAULT_ACCEPT_POLL_RATE_US 10000
      43             : 
      44             : union nvmf_h2c_msg {
      45             :         struct spdk_nvmf_capsule_cmd                    nvmf_cmd;
      46             :         struct spdk_nvme_cmd                            nvme_cmd;
      47             :         struct spdk_nvmf_fabric_prop_set_cmd            prop_set_cmd;
      48             :         struct spdk_nvmf_fabric_prop_get_cmd            prop_get_cmd;
      49             :         struct spdk_nvmf_fabric_connect_cmd             connect_cmd;
      50             :         struct spdk_nvmf_fabric_auth_send_cmd           auth_send_cmd;
      51             :         struct spdk_nvmf_fabric_auth_recv_cmd           auth_recv_cmd;
      52             : };
      53             : SPDK_STATIC_ASSERT(sizeof(union nvmf_h2c_msg) == 64, "Incorrect size");
      54             : 
      55             : union nvmf_c2h_msg {
      56             :         struct spdk_nvme_cpl                            nvme_cpl;
      57             :         struct spdk_nvmf_fabric_prop_get_rsp            prop_get_rsp;
      58             :         struct spdk_nvmf_fabric_connect_rsp             connect_rsp;
      59             : };
      60             : SPDK_STATIC_ASSERT(sizeof(union nvmf_c2h_msg) == 16, "Incorrect size");
      61             : 
      62             : struct spdk_nvmf_dif_info {
      63             :         struct spdk_dif_ctx                     dif_ctx;
      64             :         uint32_t                                elba_length;
      65             :         uint32_t                                orig_length;
      66             : };
      67             : 
      68             : struct spdk_nvmf_stripped_data {
      69             :         uint32_t                        iovcnt;
      70             :         struct iovec                    iov[NVMF_REQ_MAX_BUFFERS];
      71             : };
      72             : 
      73             : enum spdk_nvmf_zcopy_phase {
      74             :         NVMF_ZCOPY_PHASE_NONE,        /* Request is not using ZCOPY */
      75             :         NVMF_ZCOPY_PHASE_INIT,        /* Requesting Buffers */
      76             :         NVMF_ZCOPY_PHASE_EXECUTE,     /* Got buffers processing commands */
      77             :         NVMF_ZCOPY_PHASE_END_PENDING, /* Releasing buffers */
      78             :         NVMF_ZCOPY_PHASE_COMPLETE,    /* Buffers Released */
      79             :         NVMF_ZCOPY_PHASE_INIT_FAILED  /* Failed to get the buffers */
      80             : };
      81             : 
      82             : struct spdk_nvmf_request {
      83             :         struct spdk_nvmf_qpair          *qpair;
      84             :         uint32_t                        length;
      85             :         uint8_t                         xfer; /* type enum spdk_nvme_data_transfer */
      86             :         union {
      87             :                 uint8_t raw;
      88             :                 struct {
      89             :                         uint8_t data_from_pool          : 1;
      90             :                         uint8_t dif_enabled             : 1;
      91             :                         uint8_t first_fused             : 1;
      92             :                         uint8_t rsvd                    : 5;
      93             :                 };
      94             :         };
      95             :         uint8_t                         zcopy_phase; /* type enum spdk_nvmf_zcopy_phase */
      96             :         uint8_t                         iovcnt;
      97             :         union nvmf_h2c_msg              *cmd;
      98             :         union nvmf_c2h_msg              *rsp;
      99             :         STAILQ_ENTRY(spdk_nvmf_request) buf_link;
     100             :         TAILQ_ENTRY(spdk_nvmf_request)  link;
     101             : 
     102             :         /* Memory domain which describes payload in this request. If the bdev doesn't support memory
     103             :          * domains, bdev layer will do the necessary push or pull operation. */
     104             :         struct spdk_memory_domain       *memory_domain;
     105             :         /* Context to be passed to memory domain operations. */
     106             :         void                            *memory_domain_ctx;
     107             :         struct spdk_accel_sequence      *accel_sequence;
     108             : 
     109             :         struct iovec                    iov[NVMF_REQ_MAX_BUFFERS];
     110             : 
     111             :         struct spdk_nvmf_stripped_data  *stripped_data;
     112             : 
     113             :         struct spdk_nvmf_dif_info       dif;
     114             : 
     115             :         struct spdk_bdev_io_wait_entry  bdev_io_wait;
     116             :         spdk_nvmf_nvme_passthru_cmd_cb  cmd_cb_fn;
     117             :         struct spdk_nvmf_request        *first_fused_req;
     118             :         struct spdk_nvmf_request        *req_to_abort;
     119             :         struct spdk_poller              *poller;
     120             :         struct spdk_bdev_io             *zcopy_bdev_io; /* Contains the bdev_io when using ZCOPY */
     121             : 
     122             :         /* Timeout tracked for connect and abort flows. */
     123             :         uint64_t timeout_tsc;
     124             : };
     125             : SPDK_STATIC_ASSERT(sizeof(struct spdk_nvmf_request) == 776, "Incorrect size");
     126             : 
     127             : enum spdk_nvmf_qpair_state {
     128             :         SPDK_NVMF_QPAIR_UNINITIALIZED = 0,
     129             :         SPDK_NVMF_QPAIR_CONNECTING,
     130             :         SPDK_NVMF_QPAIR_AUTHENTICATING,
     131             :         SPDK_NVMF_QPAIR_ENABLED,
     132             :         SPDK_NVMF_QPAIR_DEACTIVATING,
     133             :         SPDK_NVMF_QPAIR_ERROR,
     134             : };
     135             : 
     136             : typedef void (*spdk_nvmf_state_change_done)(void *cb_arg, int status);
     137             : 
     138             : struct spdk_nvmf_qpair_auth;
     139             : 
     140             : struct spdk_nvmf_qpair {
     141             :         uint8_t                                 state; /* ref spdk_nvmf_qpair_state */
     142             :         uint8_t                                 rsvd;
     143             :         uint16_t                                qid;
     144             :         uint16_t                                sq_head;
     145             :         uint16_t                                sq_head_max;
     146             : 
     147             :         struct spdk_nvmf_transport              *transport;
     148             :         struct spdk_nvmf_ctrlr                  *ctrlr;
     149             :         struct spdk_nvmf_poll_group             *group;
     150             : 
     151             :         union {
     152             :                 struct spdk_nvmf_request        *first_fused_req;
     153             :                 struct spdk_nvmf_request        *connect_req;
     154             :         };
     155             : 
     156             :         TAILQ_HEAD(, spdk_nvmf_request)         outstanding;
     157             :         TAILQ_ENTRY(spdk_nvmf_qpair)            link;
     158             : 
     159             :         spdk_nvmf_state_change_done             state_cb;
     160             :         void                                    *state_cb_arg;
     161             : 
     162             :         bool                                    connect_received;
     163             :         bool                                    disconnect_started;
     164             : 
     165             :         uint16_t                                trace_id;
     166             : 
     167             :         /* Number of IO outstanding at transport level */
     168             :         uint16_t                                queue_depth;
     169             : 
     170             :         struct spdk_nvmf_qpair_auth             *auth;
     171             : };
     172             : 
     173             : struct spdk_nvmf_transport_poll_group {
     174             :         struct spdk_nvmf_transport                                      *transport;
     175             :         /* Requests that are waiting to obtain a data buffer */
     176             :         STAILQ_HEAD(, spdk_nvmf_request)                                pending_buf_queue;
     177             :         struct spdk_iobuf_channel                                       *buf_cache;
     178             :         struct spdk_nvmf_poll_group                                     *group;
     179             :         TAILQ_ENTRY(spdk_nvmf_transport_poll_group)                     link;
     180             : };
     181             : 
     182             : struct spdk_nvmf_poll_group {
     183             :         struct spdk_thread                              *thread;
     184             :         struct spdk_poller                              *poller;
     185             : 
     186             :         TAILQ_HEAD(, spdk_nvmf_transport_poll_group)    tgroups;
     187             : 
     188             :         /* Array of poll groups indexed by subsystem id (sid) */
     189             :         struct spdk_nvmf_subsystem_poll_group           *sgroups;
     190             :         uint32_t                                        num_sgroups;
     191             : 
     192             :         /* Protected by mutex. Counts qpairs that have connected at a
     193             :          * transport level, but are not associated with a subsystem
     194             :          * or controller yet (because the CONNECT capsule hasn't
     195             :          * been received). */
     196             :         uint32_t                                        current_unassociated_qpairs;
     197             : 
     198             :         /* All of the queue pairs that belong to this poll group */
     199             :         TAILQ_HEAD(, spdk_nvmf_qpair)                   qpairs;
     200             : 
     201             :         /* Statistics */
     202             :         struct spdk_nvmf_poll_group_stat                stat;
     203             : 
     204             :         spdk_nvmf_poll_group_destroy_done_fn            destroy_cb_fn;
     205             :         void                                            *destroy_cb_arg;
     206             : 
     207             :         struct spdk_nvmf_tgt                            *tgt;
     208             : 
     209             :         TAILQ_ENTRY(spdk_nvmf_poll_group)               link;
     210             : 
     211             :         pthread_mutex_t                                 mutex;
     212             : };
     213             : 
     214             : struct spdk_nvmf_listener {
     215             :         struct spdk_nvme_transport_id   trid;
     216             :         uint32_t                        ref;
     217             : 
     218             :         TAILQ_ENTRY(spdk_nvmf_listener) link;
     219             : };
     220             : 
     221             : /**
     222             :  * A subset of struct spdk_nvme_ctrlr_data that are emulated by a fabrics device.
     223             :  */
     224             : struct spdk_nvmf_ctrlr_data {
     225             :         uint8_t aerl;
     226             :         uint16_t kas;
     227             :         /** pci vendor id */
     228             :         uint16_t vid;
     229             :         /** pci subsystem vendor id */
     230             :         uint16_t ssvid;
     231             :         /** ieee oui identifier */
     232             :         uint8_t ieee[3];
     233             :         struct spdk_nvme_cdata_oacs oacs;
     234             :         struct spdk_nvme_cdata_oncs oncs;
     235             :         struct spdk_nvme_cdata_fuses fuses;
     236             :         struct spdk_nvme_cdata_sgls sgls;
     237             :         struct spdk_nvme_cdata_nvmf_specific nvmf_specific;
     238             : };
     239             : 
     240             : #define MAX_MEMPOOL_NAME_LENGTH 40
     241             : 
     242             : /* abidiff has a problem with changes in spdk_nvmf_transport_opts, so spdk_nvmf_transport had to be
     243             :  * added to the suppression list, so if spdk_nvmf_transport is changed, we need to remove the
     244             :  * suppression and bump up the major version.
     245             :  */
     246             : struct spdk_nvmf_transport {
     247             :         struct spdk_nvmf_tgt                    *tgt;
     248             :         const struct spdk_nvmf_transport_ops    *ops;
     249             :         struct spdk_nvmf_transport_opts         opts;
     250             : 
     251             :         char                                    iobuf_name[MAX_MEMPOOL_NAME_LENGTH];
     252             : 
     253             :         TAILQ_HEAD(, spdk_nvmf_listener)        listeners;
     254             :         TAILQ_ENTRY(spdk_nvmf_transport)        link;
     255             : 
     256             :         pthread_mutex_t                         mutex;
     257             : };
     258             : 
     259             : typedef void (*spdk_nvmf_transport_qpair_fini_cb)(void *cb_arg);
     260             : 
     261             : struct spdk_nvmf_transport_ops {
     262             :         /**
     263             :          * Transport name
     264             :          */
     265             :         char name[SPDK_NVMF_TRSTRING_MAX_LEN];
     266             : 
     267             :         /**
     268             :          * Transport type
     269             :          */
     270             :         enum spdk_nvme_transport_type type;
     271             : 
     272             :         /**
     273             :          * Initialize transport options to default value
     274             :          */
     275             :         void (*opts_init)(struct spdk_nvmf_transport_opts *opts);
     276             : 
     277             :         /**
     278             :          * Create a transport for the given transport opts. Either synchronous
     279             :          * or asynchronous version shall be implemented.
     280             :          */
     281             :         struct spdk_nvmf_transport *(*create)(struct spdk_nvmf_transport_opts *opts);
     282             :         int (*create_async)(struct spdk_nvmf_transport_opts *opts, spdk_nvmf_transport_create_done_cb cb_fn,
     283             :                             void *cb_arg);
     284             : 
     285             :         /**
     286             :          * Dump transport-specific opts into JSON
     287             :          */
     288             :         void (*dump_opts)(struct spdk_nvmf_transport *transport,
     289             :                           struct spdk_json_write_ctx *w);
     290             : 
     291             :         /**
     292             :          * Destroy the transport
     293             :          */
     294             :         int (*destroy)(struct spdk_nvmf_transport *transport,
     295             :                        spdk_nvmf_transport_destroy_done_cb cb_fn, void *cb_arg);
     296             : 
     297             :         /**
     298             :           * Instruct the transport to accept new connections at the address
     299             :           * provided. This may be called multiple times.
     300             :           */
     301             :         int (*listen)(struct spdk_nvmf_transport *transport, const struct spdk_nvme_transport_id *trid,
     302             :                       struct spdk_nvmf_listen_opts *opts);
     303             : 
     304             :         /**
     305             :          * Dump transport-specific listen opts into JSON
     306             :          */
     307             :         void (*listen_dump_opts)(struct spdk_nvmf_transport *transport,
     308             :                                  const struct spdk_nvme_transport_id *trid, struct spdk_json_write_ctx *w);
     309             : 
     310             :         /**
     311             :           * Stop accepting new connections at the given address.
     312             :           */
     313             :         void (*stop_listen)(struct spdk_nvmf_transport *transport,
     314             :                             const struct spdk_nvme_transport_id *trid);
     315             : 
     316             :         /**
     317             :          * It is a notification that a listener is being associated with the subsystem.
     318             :          * Most transports will not need to take any action here, as the enforcement
     319             :          * of the association is done in the generic code.
     320             :          *
     321             :          * Returns a negated errno code to block the association. 0 to allow.
     322             :          */
     323             :         int (*listen_associate)(struct spdk_nvmf_transport *transport,
     324             :                                 const struct spdk_nvmf_subsystem *subsystem,
     325             :                                 const struct spdk_nvme_transport_id *trid);
     326             : 
     327             :         /**
     328             :          * It is a notification that a namespace is being added to the subsystem.
     329             :          * Most transports will not need to take any action here.
     330             :          *
     331             :          * Returns a negated errno code to block the attachment. 0 to allow.
     332             :          */
     333             :         int (*subsystem_add_ns)(struct spdk_nvmf_transport *transport,
     334             :                                 const struct spdk_nvmf_subsystem *subsystem, struct spdk_nvmf_ns *ns);
     335             : 
     336             :         /**
     337             :          * It is a notification that a namespace has been removed from the subsystem.
     338             :          * Most transports will not need to take any action here.
     339             :          */
     340             :         void (*subsystem_remove_ns)(struct spdk_nvmf_transport *transport,
     341             :                                     const struct spdk_nvmf_subsystem *subsystem, uint32_t nsid);
     342             : 
     343             :         /**
     344             :          * Initialize subset of identify controller data.
     345             :          */
     346             :         void (*cdata_init)(struct spdk_nvmf_transport *transport, struct spdk_nvmf_subsystem *subsystem,
     347             :                            struct spdk_nvmf_ctrlr_data *cdata);
     348             : 
     349             :         /**
     350             :          * Fill out a discovery log entry for a specific listen address.
     351             :          */
     352             :         void (*listener_discover)(struct spdk_nvmf_transport *transport,
     353             :                                   struct spdk_nvme_transport_id *trid,
     354             :                                   struct spdk_nvmf_discovery_log_page_entry *entry);
     355             : 
     356             :         /**
     357             :          * Create a new poll group
     358             :          */
     359             :         struct spdk_nvmf_transport_poll_group *(*poll_group_create)(struct spdk_nvmf_transport *transport,
     360             :                         struct spdk_nvmf_poll_group *group);
     361             : 
     362             :         /**
     363             :          * Get the polling group of the queue pair optimal for the specific transport
     364             :          */
     365             :         struct spdk_nvmf_transport_poll_group *(*get_optimal_poll_group)(struct spdk_nvmf_qpair *qpair);
     366             : 
     367             :         /**
     368             :          * Destroy a poll group
     369             :          */
     370             :         void (*poll_group_destroy)(struct spdk_nvmf_transport_poll_group *group);
     371             : 
     372             :         /**
     373             :          * Add a qpair to a poll group
     374             :          */
     375             :         int (*poll_group_add)(struct spdk_nvmf_transport_poll_group *group,
     376             :                               struct spdk_nvmf_qpair *qpair);
     377             : 
     378             :         /**
     379             :          * Remove a qpair from a poll group
     380             :          */
     381             :         int (*poll_group_remove)(struct spdk_nvmf_transport_poll_group *group,
     382             :                                  struct spdk_nvmf_qpair *qpair);
     383             : 
     384             :         /**
     385             :          * Poll the group to process I/O
     386             :          */
     387             :         int (*poll_group_poll)(struct spdk_nvmf_transport_poll_group *group);
     388             : 
     389             :         /*
     390             :          * Free the request without sending a response
     391             :          * to the originator. Release memory tied to this request.
     392             :          */
     393             :         int (*req_free)(struct spdk_nvmf_request *req);
     394             : 
     395             :         /*
     396             :          * Signal request completion, which sends a response
     397             :          * to the originator.
     398             :          */
     399             :         int (*req_complete)(struct spdk_nvmf_request *req);
     400             : 
     401             :         /*
     402             :          * Deinitialize a connection.
     403             :          */
     404             :         void (*qpair_fini)(struct spdk_nvmf_qpair *qpair,
     405             :                            spdk_nvmf_transport_qpair_fini_cb cb_fn,
     406             :                            void *cb_args);
     407             : 
     408             :         /*
     409             :          * Get the peer transport ID for the queue pair.
     410             :          */
     411             :         int (*qpair_get_peer_trid)(struct spdk_nvmf_qpair *qpair,
     412             :                                    struct spdk_nvme_transport_id *trid);
     413             : 
     414             :         /*
     415             :          * Get the local transport ID for the queue pair.
     416             :          */
     417             :         int (*qpair_get_local_trid)(struct spdk_nvmf_qpair *qpair,
     418             :                                     struct spdk_nvme_transport_id *trid);
     419             : 
     420             :         /*
     421             :          * Get the listener transport ID that accepted this qpair originally.
     422             :          */
     423             :         int (*qpair_get_listen_trid)(struct spdk_nvmf_qpair *qpair,
     424             :                                      struct spdk_nvme_transport_id *trid);
     425             : 
     426             :         /*
     427             :          * Abort the request which the abort request specifies.
     428             :          * This function can complete synchronously or asynchronously, but
     429             :          * is expected to call spdk_nvmf_request_complete() in the end
     430             :          * for both cases.
     431             :          */
     432             :         void (*qpair_abort_request)(struct spdk_nvmf_qpair *qpair,
     433             :                                     struct spdk_nvmf_request *req);
     434             : 
     435             :         /*
     436             :          * Dump transport poll group statistics into JSON.
     437             :          */
     438             :         void (*poll_group_dump_stat)(struct spdk_nvmf_transport_poll_group *group,
     439             :                                      struct spdk_json_write_ctx *w);
     440             : 
     441             :         /*
     442             :          * A notification that a subsystem has been configured to allow access
     443             :          * from the given host.
     444             :          * This callback is optional and not all transports need to implement it.
     445             :          */
     446             :         int (*subsystem_add_host)(struct spdk_nvmf_transport *transport,
     447             :                                   const struct spdk_nvmf_subsystem *subsystem,
     448             :                                   const char *hostnqn,
     449             :                                   const struct spdk_json_val *transport_specific);
     450             : 
     451             :         /*
     452             :          * A notification that a subsystem is no longer configured to allow access
     453             :          * from the given host.
     454             :          * This callback is optional and not all transports need to implement it.
     455             :          */
     456             :         void (*subsystem_remove_host)(struct spdk_nvmf_transport *transport,
     457             :                                       const struct spdk_nvmf_subsystem *subsystem,
     458             :                                       const char *hostnqn);
     459             : 
     460             :         /*
     461             :          * A callback used to dump subsystem's host data for a specific transport.
     462             :          * This callback is optional and not all transports need to implement it.
     463             :          */
     464             :         void (*subsystem_dump_host)(struct spdk_nvmf_transport *transport,
     465             :                                     const struct spdk_nvmf_subsystem *subsystem,
     466             :                                     const char *hostnqn, struct spdk_json_write_ctx *w);
     467             : };
     468             : 
     469             : /**
     470             :  * Register the operations for a given transport type.
     471             :  *
     472             :  * This function should be invoked by referencing the macro
     473             :  * SPDK_NVMF_TRANSPORT_REGISTER macro in the transport's .c file.
     474             :  *
     475             :  * \param ops The operations associated with an NVMe-oF transport.
     476             :  */
     477             : void spdk_nvmf_transport_register(const struct spdk_nvmf_transport_ops *ops);
     478             : 
     479             : int spdk_nvmf_ctrlr_connect(struct spdk_nvmf_request *req);
     480             : 
     481             : /**
     482             :  * Function to be called for each newly discovered qpair.
     483             :  *
     484             :  * \param tgt The nvmf target
     485             :  * \param qpair The newly discovered qpair.
     486             :  */
     487             : void spdk_nvmf_tgt_new_qpair(struct spdk_nvmf_tgt *tgt, struct spdk_nvmf_qpair *qpair);
     488             : 
     489             : static inline bool
     490          53 : spdk_nvmf_qpair_is_active(struct spdk_nvmf_qpair *qpair)
     491             : {
     492          94 :         return qpair->state == SPDK_NVMF_QPAIR_CONNECTING ||
     493          94 :                qpair->state == SPDK_NVMF_QPAIR_AUTHENTICATING ||
     494          41 :                qpair->state == SPDK_NVMF_QPAIR_ENABLED;
     495             : }
     496             : 
     497             : /**
     498             :  * A subset of struct spdk_nvme_registers that are emulated by a fabrics device.
     499             :  */
     500             : struct spdk_nvmf_registers {
     501             :         union spdk_nvme_cap_register    cap;
     502             :         union spdk_nvme_vs_register     vs;
     503             :         union spdk_nvme_cc_register     cc;
     504             :         union spdk_nvme_csts_register   csts;
     505             :         union spdk_nvme_aqa_register    aqa;
     506             :         uint64_t                        asq;
     507             :         uint64_t                        acq;
     508             : };
     509             : SPDK_STATIC_ASSERT(sizeof(struct spdk_nvmf_registers) == 40, "Incorrect size");
     510             : 
     511             : const struct spdk_nvmf_registers *spdk_nvmf_ctrlr_get_regs(struct spdk_nvmf_ctrlr *ctrlr);
     512             : 
     513             : void spdk_nvmf_request_free_buffers(struct spdk_nvmf_request *req,
     514             :                                     struct spdk_nvmf_transport_poll_group *group,
     515             :                                     struct spdk_nvmf_transport *transport);
     516             : int spdk_nvmf_request_get_buffers(struct spdk_nvmf_request *req,
     517             :                                   struct spdk_nvmf_transport_poll_group *group,
     518             :                                   struct spdk_nvmf_transport *transport,
     519             :                                   uint32_t length);
     520             : 
     521             : bool spdk_nvmf_request_get_dif_ctx(struct spdk_nvmf_request *req, struct spdk_dif_ctx *dif_ctx);
     522             : 
     523             : void spdk_nvmf_request_exec(struct spdk_nvmf_request *req);
     524             : void spdk_nvmf_request_exec_fabrics(struct spdk_nvmf_request *req);
     525             : int spdk_nvmf_request_free(struct spdk_nvmf_request *req);
     526             : int spdk_nvmf_request_complete(struct spdk_nvmf_request *req);
     527             : void spdk_nvmf_request_zcopy_start(struct spdk_nvmf_request *req);
     528             : void spdk_nvmf_request_zcopy_end(struct spdk_nvmf_request *req, bool commit);
     529             : 
     530             : static inline bool
     531           8 : spdk_nvmf_request_using_zcopy(const struct spdk_nvmf_request *req)
     532             : {
     533           8 :         return req->zcopy_phase != NVMF_ZCOPY_PHASE_NONE;
     534             : }
     535             : 
     536             : /**
     537             :  * Remove the given qpair from the poll group.
     538             :  *
     539             :  * \param qpair The qpair to remove.
     540             :  */
     541             : void spdk_nvmf_poll_group_remove(struct spdk_nvmf_qpair *qpair);
     542             : 
     543             : /**
     544             :  * Get the NVMe-oF subsystem associated with this controller.
     545             :  *
     546             :  * \param ctrlr The NVMe-oF controller
     547             :  *
     548             :  * \return The NVMe-oF subsystem
     549             :  */
     550             : struct spdk_nvmf_subsystem *
     551             : spdk_nvmf_ctrlr_get_subsystem(struct spdk_nvmf_ctrlr *ctrlr);
     552             : 
     553             : /**
     554             :  * Get the NVMe-oF controller ID.
     555             :  *
     556             :  * \param ctrlr The NVMe-oF controller
     557             :  *
     558             :  * \return The NVMe-oF controller ID
     559             :  */
     560             : uint16_t spdk_nvmf_ctrlr_get_id(struct spdk_nvmf_ctrlr *ctrlr);
     561             : 
     562             : struct spdk_nvmf_ctrlr_feat {
     563             :         union spdk_nvme_feat_arbitration arbitration;
     564             :         union spdk_nvme_feat_power_management power_management;
     565             :         union spdk_nvme_feat_error_recovery error_recovery;
     566             :         union spdk_nvme_feat_volatile_write_cache volatile_write_cache;
     567             :         union spdk_nvme_feat_number_of_queues number_of_queues;
     568             :         union spdk_nvme_feat_interrupt_coalescing interrupt_coalescing;
     569             :         union spdk_nvme_feat_interrupt_vector_configuration interrupt_vector_configuration;
     570             :         union spdk_nvme_feat_write_atomicity write_atomicity;
     571             :         union spdk_nvme_feat_async_event_configuration async_event_configuration;
     572             :         union spdk_nvme_feat_keep_alive_timer keep_alive_timer;
     573             : };
     574             : SPDK_STATIC_ASSERT(sizeof(struct spdk_nvmf_ctrlr_feat) == 40, "Incorrect size");
     575             : 
     576             : /*
     577             :  * Migration data structure used to save & restore a NVMe-oF controller.
     578             :  *
     579             :  * The data structure is experimental.
     580             :  *
     581             :  */
     582             : struct spdk_nvmf_ctrlr_migr_data {
     583             :         /* `data_size` is valid size of `spdk_nvmf_ctrlr_migr_data` without counting `unused`.
     584             :          * We use this field to migrate `spdk_nvmf_ctrlr_migr_data` from source VM and restore
     585             :          * it in destination VM.
     586             :          */
     587             :         uint32_t data_size;
     588             :         /* `regs_size` is valid size of `spdk_nvmf_registers`. */
     589             :         uint32_t regs_size;
     590             :         /* `feat_size` is valid size of `spdk_nvmf_ctrlr_feat`. */
     591             :         uint32_t feat_size;
     592             :         uint32_t reserved;
     593             : 
     594             :         struct spdk_nvmf_registers regs;
     595             :         uint8_t regs_reserved[216];
     596             : 
     597             :         struct spdk_nvmf_ctrlr_feat feat;
     598             :         uint8_t feat_reserved[216];
     599             : 
     600             :         uint16_t cntlid;
     601             :         uint8_t acre;
     602             :         uint8_t num_aer_cids;
     603             :         uint32_t num_async_events;
     604             : 
     605             :         union spdk_nvme_async_event_completion async_events[SPDK_NVMF_MIGR_MAX_PENDING_AERS];
     606             :         uint16_t aer_cids[SPDK_NVMF_MAX_ASYNC_EVENTS];
     607             :         uint64_t notice_aen_mask;
     608             : 
     609             :         uint8_t unused[2516];
     610             : };
     611             : SPDK_STATIC_ASSERT(offsetof(struct spdk_nvmf_ctrlr_migr_data,
     612             :                             regs) - offsetof(struct spdk_nvmf_ctrlr_migr_data, data_size) == 16, "Incorrect header size");
     613             : SPDK_STATIC_ASSERT(offsetof(struct spdk_nvmf_ctrlr_migr_data,
     614             :                             feat) - offsetof(struct spdk_nvmf_ctrlr_migr_data, regs) == 256, "Incorrect regs size");
     615             : SPDK_STATIC_ASSERT(offsetof(struct spdk_nvmf_ctrlr_migr_data,
     616             :                             cntlid) - offsetof(struct spdk_nvmf_ctrlr_migr_data, feat) == 256, "Incorrect feat size");
     617             : SPDK_STATIC_ASSERT(sizeof(struct spdk_nvmf_ctrlr_migr_data) == 4096, "Incorrect size");
     618             : 
     619             : /**
     620             :  * Save the NVMe-oF controller state and configuration.
     621             :  *
     622             :  * The API is experimental.
     623             :  *
     624             :  * It is allowed to save the data only when the nvmf subystem is in paused
     625             :  * state i.e. there are no outstanding cmds in nvmf layer (other than aer),
     626             :  * pending async event completions are getting blocked.
     627             :  *
     628             :  * To preserve thread safety this function must be executed on the same thread
     629             :  * the NVMe-OF controller was created.
     630             :  *
     631             :  * \param ctrlr The NVMe-oF controller
     632             :  * \param data The NVMe-oF controller state and configuration to be saved
     633             :  *
     634             :  * \return 0 on success or a negated errno on failure.
     635             :  */
     636             : int spdk_nvmf_ctrlr_save_migr_data(struct spdk_nvmf_ctrlr *ctrlr,
     637             :                                    struct spdk_nvmf_ctrlr_migr_data *data);
     638             : 
     639             : /**
     640             :  * Restore the NVMe-oF controller state and configuration.
     641             :  *
     642             :  * The API is experimental.
     643             :  *
     644             :  * It is allowed to restore the data only when the nvmf subystem is in paused
     645             :  * state.
     646             :  *
     647             :  * To preserve thread safety this function must be executed on the same thread
     648             :  * the NVMe-OF controller was created.
     649             :  *
     650             :  * AERs shall be restored using spdk_nvmf_request_exec after this function is executed.
     651             :  *
     652             :  * \param ctrlr The NVMe-oF controller
     653             :  * \param data The NVMe-oF controller state and configuration to be restored
     654             :  *
     655             :  * \return 0 on success or a negated errno on failure.
     656             :  */
     657             : int spdk_nvmf_ctrlr_restore_migr_data(struct spdk_nvmf_ctrlr *ctrlr,
     658             :                                       const struct spdk_nvmf_ctrlr_migr_data *data);
     659             : 
     660             : static inline enum spdk_nvme_data_transfer
     661          10 : spdk_nvmf_req_get_xfer(struct spdk_nvmf_request *req) {
     662             :         enum spdk_nvme_data_transfer xfer;
     663          10 :         struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
     664          10 :         struct spdk_nvme_sgl_descriptor *sgl = &cmd->dptr.sgl1;
     665             : 
     666             :         /* Figure out data transfer direction */
     667          10 :         if (cmd->opc == SPDK_NVME_OPC_FABRIC)
     668             :         {
     669           2 :                 xfer = spdk_nvme_opc_get_data_transfer(req->cmd->nvmf_cmd.fctype);
     670             :         } else
     671             :         {
     672           8 :                 xfer = spdk_nvme_opc_get_data_transfer(cmd->opc);
     673             :         }
     674             : 
     675          10 :         if (xfer == SPDK_NVME_DATA_NONE)
     676             :         {
     677           0 :                 return xfer;
     678             :         }
     679             : 
     680             :         /* Even for commands that may transfer data, they could have specified 0 length.
     681             :          * We want those to show up with xfer SPDK_NVME_DATA_NONE.
     682             :          */
     683          10 :         switch (sgl->generic.type)
     684             :         {
     685           4 :         case SPDK_NVME_SGL_TYPE_DATA_BLOCK:
     686             :         case SPDK_NVME_SGL_TYPE_BIT_BUCKET:
     687             :         case SPDK_NVME_SGL_TYPE_SEGMENT:
     688             :         case SPDK_NVME_SGL_TYPE_LAST_SEGMENT:
     689             :         case SPDK_NVME_SGL_TYPE_TRANSPORT_DATA_BLOCK:
     690           4 :                 if (sgl->unkeyed.length == 0) {
     691           0 :                         xfer = SPDK_NVME_DATA_NONE;
     692             :                 }
     693           4 :                 break;
     694           6 :         case SPDK_NVME_SGL_TYPE_KEYED_DATA_BLOCK:
     695           6 :                 if (sgl->keyed.length == 0) {
     696           0 :                         xfer = SPDK_NVME_DATA_NONE;
     697             :                 }
     698           6 :                 break;
     699             :         }
     700             : 
     701          10 :         return xfer;
     702             : }
     703             : 
     704             : /**
     705             :  * Complete Asynchronous Event as Error.
     706             :  *
     707             :  * \param ctrlr Controller whose AER is going to be completed.
     708             :  * \param info Asynchronous Event Error Information to be reported.
     709             :  *
     710             :  * \return int. 0 if it completed successfully, or negative errno if it failed.
     711             :  */
     712             : int spdk_nvmf_ctrlr_async_event_error_event(struct spdk_nvmf_ctrlr *ctrlr,
     713             :                 enum spdk_nvme_async_event_info_error info);
     714             : 
     715             : /**
     716             :  * Abort outstanding Asynchronous Event Requests (AERs).
     717             :  *
     718             :  * Completes AERs with ABORTED_BY_REQUEST status code.
     719             :  *
     720             :  * \param ctrlr Controller whose AERs are going to be aborted.
     721             :  */
     722             : void spdk_nvmf_ctrlr_abort_aer(struct spdk_nvmf_ctrlr *ctrlr);
     723             : 
     724             : /*
     725             :  * Macro used to register new transports.
     726             :  */
     727             : #define SPDK_NVMF_TRANSPORT_REGISTER(name, transport_ops) \
     728             : static void __attribute__((constructor)) _spdk_nvmf_transport_register_##name(void) \
     729             : { \
     730             :         spdk_nvmf_transport_register(transport_ops); \
     731             : }
     732             : 
     733             : #ifdef __cplusplus
     734             : }
     735             : #endif
     736             : 
     737             : #endif

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