diff options
Diffstat (limited to 'src/spdk/lib/nvmf/rdma.c')
| -rw-r--r-- | src/spdk/lib/nvmf/rdma.c | 4313 |
1 files changed, 4313 insertions, 0 deletions
diff --git a/src/spdk/lib/nvmf/rdma.c b/src/spdk/lib/nvmf/rdma.c new file mode 100644 index 000000000..4a4de4374 --- /dev/null +++ b/src/spdk/lib/nvmf/rdma.c @@ -0,0 +1,4313 @@ +/*- + * BSD LICENSE + * + * Copyright (c) Intel Corporation. All rights reserved. + * Copyright (c) 2019, 2020 Mellanox Technologies LTD. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "spdk/stdinc.h" + +#include "spdk/config.h" +#include "spdk/thread.h" +#include "spdk/likely.h" +#include "spdk/nvmf_transport.h" +#include "spdk/string.h" +#include "spdk/trace.h" +#include "spdk/util.h" + +#include "spdk_internal/assert.h" +#include "spdk_internal/log.h" +#include "spdk_internal/rdma.h" + +#include "nvmf_internal.h" + +struct spdk_nvme_rdma_hooks g_nvmf_hooks = {}; +const struct spdk_nvmf_transport_ops spdk_nvmf_transport_rdma; + +/* + RDMA Connection Resource Defaults + */ +#define NVMF_DEFAULT_TX_SGE SPDK_NVMF_MAX_SGL_ENTRIES +#define NVMF_DEFAULT_RSP_SGE 1 +#define NVMF_DEFAULT_RX_SGE 2 + +/* The RDMA completion queue size */ +#define DEFAULT_NVMF_RDMA_CQ_SIZE 4096 +#define MAX_WR_PER_QP(queue_depth) (queue_depth * 3 + 2) + +/* Timeout for destroying defunct rqpairs */ +#define NVMF_RDMA_QPAIR_DESTROY_TIMEOUT_US 4000000 + +static int g_spdk_nvmf_ibv_query_mask = + IBV_QP_STATE | + IBV_QP_PKEY_INDEX | + IBV_QP_PORT | + IBV_QP_ACCESS_FLAGS | + IBV_QP_AV | + IBV_QP_PATH_MTU | + IBV_QP_DEST_QPN | + IBV_QP_RQ_PSN | + IBV_QP_MAX_DEST_RD_ATOMIC | + IBV_QP_MIN_RNR_TIMER | + IBV_QP_SQ_PSN | + IBV_QP_TIMEOUT | + IBV_QP_RETRY_CNT | + IBV_QP_RNR_RETRY | + IBV_QP_MAX_QP_RD_ATOMIC; + +enum spdk_nvmf_rdma_request_state { + /* The request is not currently in use */ + RDMA_REQUEST_STATE_FREE = 0, + + /* Initial state when request first received */ + RDMA_REQUEST_STATE_NEW, + + /* The request is queued until a data buffer is available. */ + RDMA_REQUEST_STATE_NEED_BUFFER, + + /* The request is waiting on RDMA queue depth availability + * to transfer data from the host to the controller. + */ + RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING, + + /* The request is currently transferring data from the host to the controller. */ + RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER, + + /* The request is ready to execute at the block device */ + RDMA_REQUEST_STATE_READY_TO_EXECUTE, + + /* The request is currently executing at the block device */ + RDMA_REQUEST_STATE_EXECUTING, + + /* The request finished executing at the block device */ + RDMA_REQUEST_STATE_EXECUTED, + + /* The request is waiting on RDMA queue depth availability + * to transfer data from the controller to the host. + */ + RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING, + + /* The request is ready to send a completion */ + RDMA_REQUEST_STATE_READY_TO_COMPLETE, + + /* The request is currently transferring data from the controller to the host. */ + RDMA_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST, + + /* The request currently has an outstanding completion without an + * associated data transfer. + */ + RDMA_REQUEST_STATE_COMPLETING, + + /* The request completed and can be marked free. */ + RDMA_REQUEST_STATE_COMPLETED, + + /* Terminator */ + RDMA_REQUEST_NUM_STATES, +}; + +#define OBJECT_NVMF_RDMA_IO 0x40 + +#define TRACE_GROUP_NVMF_RDMA 0x4 +#define TRACE_RDMA_REQUEST_STATE_NEW SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0x0) +#define TRACE_RDMA_REQUEST_STATE_NEED_BUFFER SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0x1) +#define TRACE_RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0x2) +#define TRACE_RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0x3) +#define TRACE_RDMA_REQUEST_STATE_READY_TO_EXECUTE SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0x4) +#define TRACE_RDMA_REQUEST_STATE_EXECUTING SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0x5) +#define TRACE_RDMA_REQUEST_STATE_EXECUTED SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0x6) +#define TRACE_RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0x7) +#define TRACE_RDMA_REQUEST_STATE_READY_TO_COMPLETE SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0x8) +#define TRACE_RDMA_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0x9) +#define TRACE_RDMA_REQUEST_STATE_COMPLETING SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0xA) +#define TRACE_RDMA_REQUEST_STATE_COMPLETED SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0xB) +#define TRACE_RDMA_QP_CREATE SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0xC) +#define TRACE_RDMA_IBV_ASYNC_EVENT SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0xD) +#define TRACE_RDMA_CM_ASYNC_EVENT SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0xE) +#define TRACE_RDMA_QP_STATE_CHANGE SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0xF) +#define TRACE_RDMA_QP_DISCONNECT SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0x10) +#define TRACE_RDMA_QP_DESTROY SPDK_TPOINT_ID(TRACE_GROUP_NVMF_RDMA, 0x11) + +SPDK_TRACE_REGISTER_FN(nvmf_trace, "nvmf_rdma", TRACE_GROUP_NVMF_RDMA) +{ + spdk_trace_register_object(OBJECT_NVMF_RDMA_IO, 'r'); + spdk_trace_register_description("RDMA_REQ_NEW", TRACE_RDMA_REQUEST_STATE_NEW, + OWNER_NONE, OBJECT_NVMF_RDMA_IO, 1, 1, "cmid: "); + spdk_trace_register_description("RDMA_REQ_NEED_BUFFER", TRACE_RDMA_REQUEST_STATE_NEED_BUFFER, + OWNER_NONE, OBJECT_NVMF_RDMA_IO, 0, 1, "cmid: "); + spdk_trace_register_description("RDMA_REQ_TX_PENDING_C2H", + TRACE_RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING, + OWNER_NONE, OBJECT_NVMF_RDMA_IO, 0, 1, "cmid: "); + spdk_trace_register_description("RDMA_REQ_TX_PENDING_H2C", + TRACE_RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING, + OWNER_NONE, OBJECT_NVMF_RDMA_IO, 0, 1, "cmid: "); + spdk_trace_register_description("RDMA_REQ_TX_H2C", + TRACE_RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER, + OWNER_NONE, OBJECT_NVMF_RDMA_IO, 0, 1, "cmid: "); + spdk_trace_register_description("RDMA_REQ_RDY_TO_EXECUTE", + TRACE_RDMA_REQUEST_STATE_READY_TO_EXECUTE, + OWNER_NONE, OBJECT_NVMF_RDMA_IO, 0, 1, "cmid: "); + spdk_trace_register_description("RDMA_REQ_EXECUTING", + TRACE_RDMA_REQUEST_STATE_EXECUTING, + OWNER_NONE, OBJECT_NVMF_RDMA_IO, 0, 1, "cmid: "); + spdk_trace_register_description("RDMA_REQ_EXECUTED", + TRACE_RDMA_REQUEST_STATE_EXECUTED, + OWNER_NONE, OBJECT_NVMF_RDMA_IO, 0, 1, "cmid: "); + spdk_trace_register_description("RDMA_REQ_RDY_TO_COMPL", + TRACE_RDMA_REQUEST_STATE_READY_TO_COMPLETE, + OWNER_NONE, OBJECT_NVMF_RDMA_IO, 0, 1, "cmid: "); + spdk_trace_register_description("RDMA_REQ_COMPLETING_C2H", + TRACE_RDMA_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST, + OWNER_NONE, OBJECT_NVMF_RDMA_IO, 0, 1, "cmid: "); + spdk_trace_register_description("RDMA_REQ_COMPLETING", + TRACE_RDMA_REQUEST_STATE_COMPLETING, + OWNER_NONE, OBJECT_NVMF_RDMA_IO, 0, 1, "cmid: "); + spdk_trace_register_description("RDMA_REQ_COMPLETED", + TRACE_RDMA_REQUEST_STATE_COMPLETED, + OWNER_NONE, OBJECT_NVMF_RDMA_IO, 0, 1, "cmid: "); + + spdk_trace_register_description("RDMA_QP_CREATE", TRACE_RDMA_QP_CREATE, + OWNER_NONE, OBJECT_NONE, 0, 0, ""); + spdk_trace_register_description("RDMA_IBV_ASYNC_EVENT", TRACE_RDMA_IBV_ASYNC_EVENT, + OWNER_NONE, OBJECT_NONE, 0, 0, "type: "); + spdk_trace_register_description("RDMA_CM_ASYNC_EVENT", TRACE_RDMA_CM_ASYNC_EVENT, + OWNER_NONE, OBJECT_NONE, 0, 0, "type: "); + spdk_trace_register_description("RDMA_QP_STATE_CHANGE", TRACE_RDMA_QP_STATE_CHANGE, + OWNER_NONE, OBJECT_NONE, 0, 1, "state: "); + spdk_trace_register_description("RDMA_QP_DISCONNECT", TRACE_RDMA_QP_DISCONNECT, + OWNER_NONE, OBJECT_NONE, 0, 0, ""); + spdk_trace_register_description("RDMA_QP_DESTROY", TRACE_RDMA_QP_DESTROY, + OWNER_NONE, OBJECT_NONE, 0, 0, ""); +} + +enum spdk_nvmf_rdma_wr_type { + RDMA_WR_TYPE_RECV, + RDMA_WR_TYPE_SEND, + RDMA_WR_TYPE_DATA, +}; + +struct spdk_nvmf_rdma_wr { + enum spdk_nvmf_rdma_wr_type type; +}; + +/* This structure holds commands as they are received off the wire. + * It must be dynamically paired with a full request object + * (spdk_nvmf_rdma_request) to service a request. It is separate + * from the request because RDMA does not appear to order + * completions, so occasionally we'll get a new incoming + * command when there aren't any free request objects. + */ +struct spdk_nvmf_rdma_recv { + struct ibv_recv_wr wr; + struct ibv_sge sgl[NVMF_DEFAULT_RX_SGE]; + + struct spdk_nvmf_rdma_qpair *qpair; + + /* In-capsule data buffer */ + uint8_t *buf; + + struct spdk_nvmf_rdma_wr rdma_wr; + uint64_t receive_tsc; + + STAILQ_ENTRY(spdk_nvmf_rdma_recv) link; +}; + +struct spdk_nvmf_rdma_request_data { + struct spdk_nvmf_rdma_wr rdma_wr; + struct ibv_send_wr wr; + struct ibv_sge sgl[SPDK_NVMF_MAX_SGL_ENTRIES]; +}; + +struct spdk_nvmf_rdma_request { + struct spdk_nvmf_request req; + + enum spdk_nvmf_rdma_request_state state; + + struct spdk_nvmf_rdma_recv *recv; + + struct { + struct spdk_nvmf_rdma_wr rdma_wr; + struct ibv_send_wr wr; + struct ibv_sge sgl[NVMF_DEFAULT_RSP_SGE]; + } rsp; + + struct spdk_nvmf_rdma_request_data data; + + uint32_t iovpos; + + uint32_t num_outstanding_data_wr; + uint64_t receive_tsc; + + STAILQ_ENTRY(spdk_nvmf_rdma_request) state_link; +}; + +enum spdk_nvmf_rdma_qpair_disconnect_flags { + RDMA_QP_DISCONNECTING = 1, + RDMA_QP_RECV_DRAINED = 1 << 1, + RDMA_QP_SEND_DRAINED = 1 << 2 +}; + +struct spdk_nvmf_rdma_resource_opts { + struct spdk_nvmf_rdma_qpair *qpair; + /* qp points either to an ibv_qp object or an ibv_srq object depending on the value of shared. */ + void *qp; + struct ibv_pd *pd; + uint32_t max_queue_depth; + uint32_t in_capsule_data_size; + bool shared; +}; + +struct spdk_nvmf_send_wr_list { + struct ibv_send_wr *first; + struct ibv_send_wr *last; +}; + +struct spdk_nvmf_recv_wr_list { + struct ibv_recv_wr *first; + struct ibv_recv_wr *last; +}; + +struct spdk_nvmf_rdma_resources { + /* Array of size "max_queue_depth" containing RDMA requests. */ + struct spdk_nvmf_rdma_request *reqs; + + /* Array of size "max_queue_depth" containing RDMA recvs. */ + struct spdk_nvmf_rdma_recv *recvs; + + /* Array of size "max_queue_depth" containing 64 byte capsules + * used for receive. + */ + union nvmf_h2c_msg *cmds; + struct ibv_mr *cmds_mr; + + /* Array of size "max_queue_depth" containing 16 byte completions + * to be sent back to the user. + */ + union nvmf_c2h_msg *cpls; + struct ibv_mr *cpls_mr; + + /* Array of size "max_queue_depth * InCapsuleDataSize" containing + * buffers to be used for in capsule data. + */ + void *bufs; + struct ibv_mr *bufs_mr; + + /* The list of pending recvs to transfer */ + struct spdk_nvmf_recv_wr_list recvs_to_post; + + /* Receives that are waiting for a request object */ + STAILQ_HEAD(, spdk_nvmf_rdma_recv) incoming_queue; + + /* Queue to track free requests */ + STAILQ_HEAD(, spdk_nvmf_rdma_request) free_queue; +}; + +typedef void (*spdk_nvmf_rdma_qpair_ibv_event)(struct spdk_nvmf_rdma_qpair *rqpair); + +struct spdk_nvmf_rdma_ibv_event_ctx { + struct spdk_nvmf_rdma_qpair *rqpair; + spdk_nvmf_rdma_qpair_ibv_event cb_fn; + /* Link to other ibv events associated with this qpair */ + STAILQ_ENTRY(spdk_nvmf_rdma_ibv_event_ctx) link; +}; + +struct spdk_nvmf_rdma_qpair { + struct spdk_nvmf_qpair qpair; + + struct spdk_nvmf_rdma_device *device; + struct spdk_nvmf_rdma_poller *poller; + + struct spdk_rdma_qp *rdma_qp; + struct rdma_cm_id *cm_id; + struct ibv_srq *srq; + struct rdma_cm_id *listen_id; + + /* The maximum number of I/O outstanding on this connection at one time */ + uint16_t max_queue_depth; + + /* The maximum number of active RDMA READ and ATOMIC operations at one time */ + uint16_t max_read_depth; + + /* The maximum number of RDMA SEND operations at one time */ + uint32_t max_send_depth; + + /* The current number of outstanding WRs from this qpair's + * recv queue. Should not exceed device->attr.max_queue_depth. + */ + uint16_t current_recv_depth; + + /* The current number of active RDMA READ operations */ + uint16_t current_read_depth; + + /* The current number of posted WRs from this qpair's + * send queue. Should not exceed max_send_depth. + */ + uint32_t current_send_depth; + + /* The maximum number of SGEs per WR on the send queue */ + uint32_t max_send_sge; + + /* The maximum number of SGEs per WR on the recv queue */ + uint32_t max_recv_sge; + + struct spdk_nvmf_rdma_resources *resources; + + STAILQ_HEAD(, spdk_nvmf_rdma_request) pending_rdma_read_queue; + + STAILQ_HEAD(, spdk_nvmf_rdma_request) pending_rdma_write_queue; + + /* Number of requests not in the free state */ + uint32_t qd; + + TAILQ_ENTRY(spdk_nvmf_rdma_qpair) link; + + STAILQ_ENTRY(spdk_nvmf_rdma_qpair) recv_link; + + STAILQ_ENTRY(spdk_nvmf_rdma_qpair) send_link; + + /* IBV queue pair attributes: they are used to manage + * qp state and recover from errors. + */ + enum ibv_qp_state ibv_state; + + uint32_t disconnect_flags; + + /* Poller registered in case the qpair doesn't properly + * complete the qpair destruct process and becomes defunct. + */ + + struct spdk_poller *destruct_poller; + + /* + * io_channel which is used to destroy qpair when it is removed from poll group + */ + struct spdk_io_channel *destruct_channel; + + /* List of ibv async events */ + STAILQ_HEAD(, spdk_nvmf_rdma_ibv_event_ctx) ibv_events; + + /* There are several ways a disconnect can start on a qpair + * and they are not all mutually exclusive. It is important + * that we only initialize one of these paths. + */ + bool disconnect_started; + /* Lets us know that we have received the last_wqe event. */ + bool last_wqe_reached; +}; + +struct spdk_nvmf_rdma_poller_stat { + uint64_t completions; + uint64_t polls; + uint64_t requests; + uint64_t request_latency; + uint64_t pending_free_request; + uint64_t pending_rdma_read; + uint64_t pending_rdma_write; +}; + +struct spdk_nvmf_rdma_poller { + struct spdk_nvmf_rdma_device *device; + struct spdk_nvmf_rdma_poll_group *group; + + int num_cqe; + int required_num_wr; + struct ibv_cq *cq; + + /* The maximum number of I/O outstanding on the shared receive queue at one time */ + uint16_t max_srq_depth; + + /* Shared receive queue */ + struct ibv_srq *srq; + + struct spdk_nvmf_rdma_resources *resources; + struct spdk_nvmf_rdma_poller_stat stat; + + TAILQ_HEAD(, spdk_nvmf_rdma_qpair) qpairs; + + STAILQ_HEAD(, spdk_nvmf_rdma_qpair) qpairs_pending_recv; + + STAILQ_HEAD(, spdk_nvmf_rdma_qpair) qpairs_pending_send; + + TAILQ_ENTRY(spdk_nvmf_rdma_poller) link; +}; + +struct spdk_nvmf_rdma_poll_group_stat { + uint64_t pending_data_buffer; +}; + +struct spdk_nvmf_rdma_poll_group { + struct spdk_nvmf_transport_poll_group group; + struct spdk_nvmf_rdma_poll_group_stat stat; + TAILQ_HEAD(, spdk_nvmf_rdma_poller) pollers; + TAILQ_ENTRY(spdk_nvmf_rdma_poll_group) link; + /* + * buffers which are split across multiple RDMA + * memory regions cannot be used by this transport. + */ + STAILQ_HEAD(, spdk_nvmf_transport_pg_cache_buf) retired_bufs; +}; + +struct spdk_nvmf_rdma_conn_sched { + struct spdk_nvmf_rdma_poll_group *next_admin_pg; + struct spdk_nvmf_rdma_poll_group *next_io_pg; +}; + +/* Assuming rdma_cm uses just one protection domain per ibv_context. */ +struct spdk_nvmf_rdma_device { + struct ibv_device_attr attr; + struct ibv_context *context; + + struct spdk_mem_map *map; + struct ibv_pd *pd; + + int num_srq; + + TAILQ_ENTRY(spdk_nvmf_rdma_device) link; +}; + +struct spdk_nvmf_rdma_port { + const struct spdk_nvme_transport_id *trid; + struct rdma_cm_id *id; + struct spdk_nvmf_rdma_device *device; + TAILQ_ENTRY(spdk_nvmf_rdma_port) link; +}; + +struct spdk_nvmf_rdma_transport { + struct spdk_nvmf_transport transport; + + struct spdk_nvmf_rdma_conn_sched conn_sched; + + struct rdma_event_channel *event_channel; + + struct spdk_mempool *data_wr_pool; + + pthread_mutex_t lock; + + /* fields used to poll RDMA/IB events */ + nfds_t npoll_fds; + struct pollfd *poll_fds; + + TAILQ_HEAD(, spdk_nvmf_rdma_device) devices; + TAILQ_HEAD(, spdk_nvmf_rdma_port) ports; + TAILQ_HEAD(, spdk_nvmf_rdma_poll_group) poll_groups; +}; + +static inline void +nvmf_rdma_start_disconnect(struct spdk_nvmf_rdma_qpair *rqpair); + +static bool +nvmf_rdma_request_process(struct spdk_nvmf_rdma_transport *rtransport, + struct spdk_nvmf_rdma_request *rdma_req); + +static inline int +nvmf_rdma_check_ibv_state(enum ibv_qp_state state) +{ + switch (state) { + case IBV_QPS_RESET: + case IBV_QPS_INIT: + case IBV_QPS_RTR: + case IBV_QPS_RTS: + case IBV_QPS_SQD: + case IBV_QPS_SQE: + case IBV_QPS_ERR: + return 0; + default: + return -1; + } +} + +static inline enum spdk_nvme_media_error_status_code +nvmf_rdma_dif_error_to_compl_status(uint8_t err_type) { + enum spdk_nvme_media_error_status_code result; + switch (err_type) + { + case SPDK_DIF_REFTAG_ERROR: + result = SPDK_NVME_SC_REFERENCE_TAG_CHECK_ERROR; + break; + case SPDK_DIF_APPTAG_ERROR: + result = SPDK_NVME_SC_APPLICATION_TAG_CHECK_ERROR; + break; + case SPDK_DIF_GUARD_ERROR: + result = SPDK_NVME_SC_GUARD_CHECK_ERROR; + break; + default: + SPDK_UNREACHABLE(); + } + + return result; +} + +static enum ibv_qp_state +nvmf_rdma_update_ibv_state(struct spdk_nvmf_rdma_qpair *rqpair) { + enum ibv_qp_state old_state, new_state; + struct ibv_qp_attr qp_attr; + struct ibv_qp_init_attr init_attr; + int rc; + + old_state = rqpair->ibv_state; + rc = ibv_query_qp(rqpair->rdma_qp->qp, &qp_attr, + g_spdk_nvmf_ibv_query_mask, &init_attr); + + if (rc) + { + SPDK_ERRLOG("Failed to get updated RDMA queue pair state!\n"); + return IBV_QPS_ERR + 1; + } + + new_state = qp_attr.qp_state; + rqpair->ibv_state = new_state; + qp_attr.ah_attr.port_num = qp_attr.port_num; + + rc = nvmf_rdma_check_ibv_state(new_state); + if (rc) + { + SPDK_ERRLOG("QP#%d: bad state updated: %u, maybe hardware issue\n", rqpair->qpair.qid, new_state); + /* + * IBV_QPS_UNKNOWN undefined if lib version smaller than libibverbs-1.1.8 + * IBV_QPS_UNKNOWN is the enum element after IBV_QPS_ERR + */ + return IBV_QPS_ERR + 1; + } + + if (old_state != new_state) + { + spdk_trace_record(TRACE_RDMA_QP_STATE_CHANGE, 0, 0, + (uintptr_t)rqpair->cm_id, new_state); + } + return new_state; +} + +static void +nvmf_rdma_request_free_data(struct spdk_nvmf_rdma_request *rdma_req, + struct spdk_nvmf_rdma_transport *rtransport) +{ + struct spdk_nvmf_rdma_request_data *data_wr; + struct ibv_send_wr *next_send_wr; + uint64_t req_wrid; + + rdma_req->num_outstanding_data_wr = 0; + data_wr = &rdma_req->data; + req_wrid = data_wr->wr.wr_id; + while (data_wr && data_wr->wr.wr_id == req_wrid) { + memset(data_wr->sgl, 0, sizeof(data_wr->wr.sg_list[0]) * data_wr->wr.num_sge); + data_wr->wr.num_sge = 0; + next_send_wr = data_wr->wr.next; + if (data_wr != &rdma_req->data) { + spdk_mempool_put(rtransport->data_wr_pool, data_wr); + } + data_wr = (!next_send_wr || next_send_wr == &rdma_req->rsp.wr) ? NULL : + SPDK_CONTAINEROF(next_send_wr, struct spdk_nvmf_rdma_request_data, wr); + } +} + +static void +nvmf_rdma_dump_request(struct spdk_nvmf_rdma_request *req) +{ + SPDK_ERRLOG("\t\tRequest Data From Pool: %d\n", req->req.data_from_pool); + if (req->req.cmd) { + SPDK_ERRLOG("\t\tRequest opcode: %d\n", req->req.cmd->nvmf_cmd.opcode); + } + if (req->recv) { + SPDK_ERRLOG("\t\tRequest recv wr_id%lu\n", req->recv->wr.wr_id); + } +} + +static void +nvmf_rdma_dump_qpair_contents(struct spdk_nvmf_rdma_qpair *rqpair) +{ + int i; + + SPDK_ERRLOG("Dumping contents of queue pair (QID %d)\n", rqpair->qpair.qid); + for (i = 0; i < rqpair->max_queue_depth; i++) { + if (rqpair->resources->reqs[i].state != RDMA_REQUEST_STATE_FREE) { + nvmf_rdma_dump_request(&rqpair->resources->reqs[i]); + } + } +} + +static void +nvmf_rdma_resources_destroy(struct spdk_nvmf_rdma_resources *resources) +{ + if (resources->cmds_mr) { + ibv_dereg_mr(resources->cmds_mr); + } + + if (resources->cpls_mr) { + ibv_dereg_mr(resources->cpls_mr); + } + + if (resources->bufs_mr) { + ibv_dereg_mr(resources->bufs_mr); + } + + spdk_free(resources->cmds); + spdk_free(resources->cpls); + spdk_free(resources->bufs); + free(resources->reqs); + free(resources->recvs); + free(resources); +} + + +static struct spdk_nvmf_rdma_resources * +nvmf_rdma_resources_create(struct spdk_nvmf_rdma_resource_opts *opts) +{ + struct spdk_nvmf_rdma_resources *resources; + struct spdk_nvmf_rdma_request *rdma_req; + struct spdk_nvmf_rdma_recv *rdma_recv; + struct ibv_qp *qp; + struct ibv_srq *srq; + uint32_t i; + int rc; + + resources = calloc(1, sizeof(struct spdk_nvmf_rdma_resources)); + if (!resources) { + SPDK_ERRLOG("Unable to allocate resources for receive queue.\n"); + return NULL; + } + + resources->reqs = calloc(opts->max_queue_depth, sizeof(*resources->reqs)); + resources->recvs = calloc(opts->max_queue_depth, sizeof(*resources->recvs)); + resources->cmds = spdk_zmalloc(opts->max_queue_depth * sizeof(*resources->cmds), + 0x1000, NULL, SPDK_ENV_LCORE_ID_ANY, SPDK_MALLOC_DMA); + resources->cpls = spdk_zmalloc(opts->max_queue_depth * sizeof(*resources->cpls), + 0x1000, NULL, SPDK_ENV_LCORE_ID_ANY, SPDK_MALLOC_DMA); + + if (opts->in_capsule_data_size > 0) { + resources->bufs = spdk_zmalloc(opts->max_queue_depth * opts->in_capsule_data_size, + 0x1000, NULL, SPDK_ENV_LCORE_ID_ANY, + SPDK_MALLOC_DMA); + } + + if (!resources->reqs || !resources->recvs || !resources->cmds || + !resources->cpls || (opts->in_capsule_data_size && !resources->bufs)) { + SPDK_ERRLOG("Unable to allocate sufficient memory for RDMA queue.\n"); + goto cleanup; + } + + resources->cmds_mr = ibv_reg_mr(opts->pd, resources->cmds, + opts->max_queue_depth * sizeof(*resources->cmds), + IBV_ACCESS_LOCAL_WRITE); + resources->cpls_mr = ibv_reg_mr(opts->pd, resources->cpls, + opts->max_queue_depth * sizeof(*resources->cpls), + 0); + + if (opts->in_capsule_data_size) { + resources->bufs_mr = ibv_reg_mr(opts->pd, resources->bufs, + opts->max_queue_depth * + opts->in_capsule_data_size, + IBV_ACCESS_LOCAL_WRITE | IBV_ACCESS_REMOTE_WRITE); + } + + if (!resources->cmds_mr || !resources->cpls_mr || + (opts->in_capsule_data_size && + !resources->bufs_mr)) { + goto cleanup; + } + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Command Array: %p Length: %lx LKey: %x\n", + resources->cmds, opts->max_queue_depth * sizeof(*resources->cmds), + resources->cmds_mr->lkey); + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Completion Array: %p Length: %lx LKey: %x\n", + resources->cpls, opts->max_queue_depth * sizeof(*resources->cpls), + resources->cpls_mr->lkey); + if (resources->bufs && resources->bufs_mr) { + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "In Capsule Data Array: %p Length: %x LKey: %x\n", + resources->bufs, opts->max_queue_depth * + opts->in_capsule_data_size, resources->bufs_mr->lkey); + } + + /* Initialize queues */ + STAILQ_INIT(&resources->incoming_queue); + STAILQ_INIT(&resources->free_queue); + + for (i = 0; i < opts->max_queue_depth; i++) { + struct ibv_recv_wr *bad_wr = NULL; + + rdma_recv = &resources->recvs[i]; + rdma_recv->qpair = opts->qpair; + + /* Set up memory to receive commands */ + if (resources->bufs) { + rdma_recv->buf = (void *)((uintptr_t)resources->bufs + (i * + opts->in_capsule_data_size)); + } + + rdma_recv->rdma_wr.type = RDMA_WR_TYPE_RECV; + + rdma_recv->sgl[0].addr = (uintptr_t)&resources->cmds[i]; + rdma_recv->sgl[0].length = sizeof(resources->cmds[i]); + rdma_recv->sgl[0].lkey = resources->cmds_mr->lkey; + rdma_recv->wr.num_sge = 1; + + if (rdma_recv->buf && resources->bufs_mr) { + rdma_recv->sgl[1].addr = (uintptr_t)rdma_recv->buf; + rdma_recv->sgl[1].length = opts->in_capsule_data_size; + rdma_recv->sgl[1].lkey = resources->bufs_mr->lkey; + rdma_recv->wr.num_sge++; + } + + rdma_recv->wr.wr_id = (uintptr_t)&rdma_recv->rdma_wr; + rdma_recv->wr.sg_list = rdma_recv->sgl; + if (opts->shared) { + srq = (struct ibv_srq *)opts->qp; + rc = ibv_post_srq_recv(srq, &rdma_recv->wr, &bad_wr); + } else { + qp = (struct ibv_qp *)opts->qp; + rc = ibv_post_recv(qp, &rdma_recv->wr, &bad_wr); + } + if (rc) { + goto cleanup; + } + } + + for (i = 0; i < opts->max_queue_depth; i++) { + rdma_req = &resources->reqs[i]; + + if (opts->qpair != NULL) { + rdma_req->req.qpair = &opts->qpair->qpair; + } else { + rdma_req->req.qpair = NULL; + } + rdma_req->req.cmd = NULL; + + /* Set up memory to send responses */ + rdma_req->req.rsp = &resources->cpls[i]; + + rdma_req->rsp.sgl[0].addr = (uintptr_t)&resources->cpls[i]; + rdma_req->rsp.sgl[0].length = sizeof(resources->cpls[i]); + rdma_req->rsp.sgl[0].lkey = resources->cpls_mr->lkey; + + rdma_req->rsp.rdma_wr.type = RDMA_WR_TYPE_SEND; + rdma_req->rsp.wr.wr_id = (uintptr_t)&rdma_req->rsp.rdma_wr; + rdma_req->rsp.wr.next = NULL; + rdma_req->rsp.wr.opcode = IBV_WR_SEND; + rdma_req->rsp.wr.send_flags = IBV_SEND_SIGNALED; + rdma_req->rsp.wr.sg_list = rdma_req->rsp.sgl; + rdma_req->rsp.wr.num_sge = SPDK_COUNTOF(rdma_req->rsp.sgl); + + /* Set up memory for data buffers */ + rdma_req->data.rdma_wr.type = RDMA_WR_TYPE_DATA; + rdma_req->data.wr.wr_id = (uintptr_t)&rdma_req->data.rdma_wr; + rdma_req->data.wr.next = NULL; + rdma_req->data.wr.send_flags = IBV_SEND_SIGNALED; + rdma_req->data.wr.sg_list = rdma_req->data.sgl; + rdma_req->data.wr.num_sge = SPDK_COUNTOF(rdma_req->data.sgl); + + /* Initialize request state to FREE */ + rdma_req->state = RDMA_REQUEST_STATE_FREE; + STAILQ_INSERT_TAIL(&resources->free_queue, rdma_req, state_link); + } + + return resources; + +cleanup: + nvmf_rdma_resources_destroy(resources); + return NULL; +} + +static void +nvmf_rdma_qpair_clean_ibv_events(struct spdk_nvmf_rdma_qpair *rqpair) +{ + struct spdk_nvmf_rdma_ibv_event_ctx *ctx, *tctx; + STAILQ_FOREACH_SAFE(ctx, &rqpair->ibv_events, link, tctx) { + ctx->rqpair = NULL; + /* Memory allocated for ctx is freed in nvmf_rdma_qpair_process_ibv_event */ + STAILQ_REMOVE(&rqpair->ibv_events, ctx, spdk_nvmf_rdma_ibv_event_ctx, link); + } +} + +static void +nvmf_rdma_qpair_destroy(struct spdk_nvmf_rdma_qpair *rqpair) +{ + struct spdk_nvmf_rdma_recv *rdma_recv, *recv_tmp; + struct ibv_recv_wr *bad_recv_wr = NULL; + int rc; + + spdk_trace_record(TRACE_RDMA_QP_DESTROY, 0, 0, (uintptr_t)rqpair->cm_id, 0); + + spdk_poller_unregister(&rqpair->destruct_poller); + + if (rqpair->qd != 0) { + struct spdk_nvmf_qpair *qpair = &rqpair->qpair; + struct spdk_nvmf_rdma_transport *rtransport = SPDK_CONTAINEROF(qpair->transport, + struct spdk_nvmf_rdma_transport, transport); + struct spdk_nvmf_rdma_request *req; + uint32_t i, max_req_count = 0; + + SPDK_WARNLOG("Destroying qpair when queue depth is %d\n", rqpair->qd); + + if (rqpair->srq == NULL) { + nvmf_rdma_dump_qpair_contents(rqpair); + max_req_count = rqpair->max_queue_depth; + } else if (rqpair->poller && rqpair->resources) { + max_req_count = rqpair->poller->max_srq_depth; + } + + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Release incomplete requests\n"); + for (i = 0; i < max_req_count; i++) { + req = &rqpair->resources->reqs[i]; + if (req->req.qpair == qpair && req->state != RDMA_REQUEST_STATE_FREE) { + /* nvmf_rdma_request_process checks qpair ibv and internal state + * and completes a request */ + nvmf_rdma_request_process(rtransport, req); + } + } + assert(rqpair->qd == 0); + } + + if (rqpair->poller) { + TAILQ_REMOVE(&rqpair->poller->qpairs, rqpair, link); + + if (rqpair->srq != NULL && rqpair->resources != NULL) { + /* Drop all received but unprocessed commands for this queue and return them to SRQ */ + STAILQ_FOREACH_SAFE(rdma_recv, &rqpair->resources->incoming_queue, link, recv_tmp) { + if (rqpair == rdma_recv->qpair) { + STAILQ_REMOVE(&rqpair->resources->incoming_queue, rdma_recv, spdk_nvmf_rdma_recv, link); + rc = ibv_post_srq_recv(rqpair->srq, &rdma_recv->wr, &bad_recv_wr); + if (rc) { + SPDK_ERRLOG("Unable to re-post rx descriptor\n"); + } + } + } + } + } + + if (rqpair->cm_id) { + if (rqpair->rdma_qp != NULL) { + spdk_rdma_qp_destroy(rqpair->rdma_qp); + rqpair->rdma_qp = NULL; + } + rdma_destroy_id(rqpair->cm_id); + + if (rqpair->poller != NULL && rqpair->srq == NULL) { + rqpair->poller->required_num_wr -= MAX_WR_PER_QP(rqpair->max_queue_depth); + } + } + + if (rqpair->srq == NULL && rqpair->resources != NULL) { + nvmf_rdma_resources_destroy(rqpair->resources); + } + + nvmf_rdma_qpair_clean_ibv_events(rqpair); + + if (rqpair->destruct_channel) { + spdk_put_io_channel(rqpair->destruct_channel); + rqpair->destruct_channel = NULL; + } + + free(rqpair); +} + +static int +nvmf_rdma_resize_cq(struct spdk_nvmf_rdma_qpair *rqpair, struct spdk_nvmf_rdma_device *device) +{ + struct spdk_nvmf_rdma_poller *rpoller; + int rc, num_cqe, required_num_wr; + + /* Enlarge CQ size dynamically */ + rpoller = rqpair->poller; + required_num_wr = rpoller->required_num_wr + MAX_WR_PER_QP(rqpair->max_queue_depth); + num_cqe = rpoller->num_cqe; + if (num_cqe < required_num_wr) { + num_cqe = spdk_max(num_cqe * 2, required_num_wr); + num_cqe = spdk_min(num_cqe, device->attr.max_cqe); + } + + if (rpoller->num_cqe != num_cqe) { + if (required_num_wr > device->attr.max_cqe) { + SPDK_ERRLOG("RDMA CQE requirement (%d) exceeds device max_cqe limitation (%d)\n", + required_num_wr, device->attr.max_cqe); + return -1; + } + + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Resize RDMA CQ from %d to %d\n", rpoller->num_cqe, num_cqe); + rc = ibv_resize_cq(rpoller->cq, num_cqe); + if (rc) { + SPDK_ERRLOG("RDMA CQ resize failed: errno %d: %s\n", errno, spdk_strerror(errno)); + return -1; + } + + rpoller->num_cqe = num_cqe; + } + + rpoller->required_num_wr = required_num_wr; + return 0; +} + +static int +nvmf_rdma_qpair_initialize(struct spdk_nvmf_qpair *qpair) +{ + struct spdk_nvmf_rdma_qpair *rqpair; + struct spdk_nvmf_rdma_transport *rtransport; + struct spdk_nvmf_transport *transport; + struct spdk_nvmf_rdma_resource_opts opts; + struct spdk_nvmf_rdma_device *device; + struct spdk_rdma_qp_init_attr qp_init_attr = {}; + + rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair); + device = rqpair->device; + + qp_init_attr.qp_context = rqpair; + qp_init_attr.pd = device->pd; + qp_init_attr.send_cq = rqpair->poller->cq; + qp_init_attr.recv_cq = rqpair->poller->cq; + + if (rqpair->srq) { + qp_init_attr.srq = rqpair->srq; + } else { + qp_init_attr.cap.max_recv_wr = rqpair->max_queue_depth; + } + + /* SEND, READ, and WRITE operations */ + qp_init_attr.cap.max_send_wr = (uint32_t)rqpair->max_queue_depth * 2; + qp_init_attr.cap.max_send_sge = spdk_min((uint32_t)device->attr.max_sge, NVMF_DEFAULT_TX_SGE); + qp_init_attr.cap.max_recv_sge = spdk_min((uint32_t)device->attr.max_sge, NVMF_DEFAULT_RX_SGE); + + if (rqpair->srq == NULL && nvmf_rdma_resize_cq(rqpair, device) < 0) { + SPDK_ERRLOG("Failed to resize the completion queue. Cannot initialize qpair.\n"); + goto error; + } + + rqpair->rdma_qp = spdk_rdma_qp_create(rqpair->cm_id, &qp_init_attr); + if (!rqpair->rdma_qp) { + goto error; + } + + rqpair->max_send_depth = spdk_min((uint32_t)(rqpair->max_queue_depth * 2), + qp_init_attr.cap.max_send_wr); + rqpair->max_send_sge = spdk_min(NVMF_DEFAULT_TX_SGE, qp_init_attr.cap.max_send_sge); + rqpair->max_recv_sge = spdk_min(NVMF_DEFAULT_RX_SGE, qp_init_attr.cap.max_recv_sge); + spdk_trace_record(TRACE_RDMA_QP_CREATE, 0, 0, (uintptr_t)rqpair->cm_id, 0); + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "New RDMA Connection: %p\n", qpair); + + if (rqpair->poller->srq == NULL) { + rtransport = SPDK_CONTAINEROF(qpair->transport, struct spdk_nvmf_rdma_transport, transport); + transport = &rtransport->transport; + + opts.qp = rqpair->rdma_qp->qp; + opts.pd = rqpair->cm_id->pd; + opts.qpair = rqpair; + opts.shared = false; + opts.max_queue_depth = rqpair->max_queue_depth; + opts.in_capsule_data_size = transport->opts.in_capsule_data_size; + + rqpair->resources = nvmf_rdma_resources_create(&opts); + + if (!rqpair->resources) { + SPDK_ERRLOG("Unable to allocate resources for receive queue.\n"); + rdma_destroy_qp(rqpair->cm_id); + goto error; + } + } else { + rqpair->resources = rqpair->poller->resources; + } + + rqpair->current_recv_depth = 0; + STAILQ_INIT(&rqpair->pending_rdma_read_queue); + STAILQ_INIT(&rqpair->pending_rdma_write_queue); + + return 0; + +error: + rdma_destroy_id(rqpair->cm_id); + rqpair->cm_id = NULL; + return -1; +} + +/* Append the given recv wr structure to the resource structs outstanding recvs list. */ +/* This function accepts either a single wr or the first wr in a linked list. */ +static void +nvmf_rdma_qpair_queue_recv_wrs(struct spdk_nvmf_rdma_qpair *rqpair, struct ibv_recv_wr *first) +{ + struct ibv_recv_wr *last; + + last = first; + while (last->next != NULL) { + last = last->next; + } + + if (rqpair->resources->recvs_to_post.first == NULL) { + rqpair->resources->recvs_to_post.first = first; + rqpair->resources->recvs_to_post.last = last; + if (rqpair->srq == NULL) { + STAILQ_INSERT_TAIL(&rqpair->poller->qpairs_pending_recv, rqpair, recv_link); + } + } else { + rqpair->resources->recvs_to_post.last->next = first; + rqpair->resources->recvs_to_post.last = last; + } +} + +static int +request_transfer_in(struct spdk_nvmf_request *req) +{ + struct spdk_nvmf_rdma_request *rdma_req; + struct spdk_nvmf_qpair *qpair; + struct spdk_nvmf_rdma_qpair *rqpair; + + qpair = req->qpair; + rdma_req = SPDK_CONTAINEROF(req, struct spdk_nvmf_rdma_request, req); + rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair); + + assert(req->xfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER); + assert(rdma_req != NULL); + + if (spdk_rdma_qp_queue_send_wrs(rqpair->rdma_qp, &rdma_req->data.wr)) { + STAILQ_INSERT_TAIL(&rqpair->poller->qpairs_pending_send, rqpair, send_link); + } + + rqpair->current_read_depth += rdma_req->num_outstanding_data_wr; + rqpair->current_send_depth += rdma_req->num_outstanding_data_wr; + return 0; +} + +static int +request_transfer_out(struct spdk_nvmf_request *req, int *data_posted) +{ + int num_outstanding_data_wr = 0; + struct spdk_nvmf_rdma_request *rdma_req; + struct spdk_nvmf_qpair *qpair; + struct spdk_nvmf_rdma_qpair *rqpair; + struct spdk_nvme_cpl *rsp; + struct ibv_send_wr *first = NULL; + + *data_posted = 0; + qpair = req->qpair; + rsp = &req->rsp->nvme_cpl; + rdma_req = SPDK_CONTAINEROF(req, struct spdk_nvmf_rdma_request, req); + rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair); + + /* Advance our sq_head pointer */ + if (qpair->sq_head == qpair->sq_head_max) { + qpair->sq_head = 0; + } else { + qpair->sq_head++; + } + rsp->sqhd = qpair->sq_head; + + /* queue the capsule for the recv buffer */ + assert(rdma_req->recv != NULL); + + nvmf_rdma_qpair_queue_recv_wrs(rqpair, &rdma_req->recv->wr); + + rdma_req->recv = NULL; + assert(rqpair->current_recv_depth > 0); + rqpair->current_recv_depth--; + + /* Build the response which consists of optional + * RDMA WRITEs to transfer data, plus an RDMA SEND + * containing the response. + */ + first = &rdma_req->rsp.wr; + + if (rsp->status.sc != SPDK_NVME_SC_SUCCESS) { + /* On failure, data was not read from the controller. So clear the + * number of outstanding data WRs to zero. + */ + rdma_req->num_outstanding_data_wr = 0; + } else if (req->xfer == SPDK_NVME_DATA_CONTROLLER_TO_HOST) { + first = &rdma_req->data.wr; + *data_posted = 1; + num_outstanding_data_wr = rdma_req->num_outstanding_data_wr; + } + if (spdk_rdma_qp_queue_send_wrs(rqpair->rdma_qp, first)) { + STAILQ_INSERT_TAIL(&rqpair->poller->qpairs_pending_send, rqpair, send_link); + } + + /* +1 for the rsp wr */ + rqpair->current_send_depth += num_outstanding_data_wr + 1; + + return 0; +} + +static int +nvmf_rdma_event_accept(struct rdma_cm_id *id, struct spdk_nvmf_rdma_qpair *rqpair) +{ + struct spdk_nvmf_rdma_accept_private_data accept_data; + struct rdma_conn_param ctrlr_event_data = {}; + int rc; + + accept_data.recfmt = 0; + accept_data.crqsize = rqpair->max_queue_depth; + + ctrlr_event_data.private_data = &accept_data; + ctrlr_event_data.private_data_len = sizeof(accept_data); + if (id->ps == RDMA_PS_TCP) { + ctrlr_event_data.responder_resources = 0; /* We accept 0 reads from the host */ + ctrlr_event_data.initiator_depth = rqpair->max_read_depth; + } + + /* Configure infinite retries for the initiator side qpair. + * When using a shared receive queue on the target side, + * we need to pass this value to the initiator to prevent the + * initiator side NIC from completing SEND requests back to the + * initiator with status rnr_retry_count_exceeded. */ + if (rqpair->srq != NULL) { + ctrlr_event_data.rnr_retry_count = 0x7; + } + + /* When qpair is created without use of rdma cm API, an additional + * information must be provided to initiator in the connection response: + * whether qpair is using SRQ and its qp_num + * Fields below are ignored by rdma cm if qpair has been + * created using rdma cm API. */ + ctrlr_event_data.srq = rqpair->srq ? 1 : 0; + ctrlr_event_data.qp_num = rqpair->rdma_qp->qp->qp_num; + + rc = spdk_rdma_qp_accept(rqpair->rdma_qp, &ctrlr_event_data); + if (rc) { + SPDK_ERRLOG("Error %d on spdk_rdma_qp_accept\n", errno); + } else { + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Sent back the accept\n"); + } + + return rc; +} + +static void +nvmf_rdma_event_reject(struct rdma_cm_id *id, enum spdk_nvmf_rdma_transport_error error) +{ + struct spdk_nvmf_rdma_reject_private_data rej_data; + + rej_data.recfmt = 0; + rej_data.sts = error; + + rdma_reject(id, &rej_data, sizeof(rej_data)); +} + +static int +nvmf_rdma_connect(struct spdk_nvmf_transport *transport, struct rdma_cm_event *event) +{ + struct spdk_nvmf_rdma_transport *rtransport; + struct spdk_nvmf_rdma_qpair *rqpair = NULL; + struct spdk_nvmf_rdma_port *port; + struct rdma_conn_param *rdma_param = NULL; + const struct spdk_nvmf_rdma_request_private_data *private_data = NULL; + uint16_t max_queue_depth; + uint16_t max_read_depth; + + rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport); + + assert(event->id != NULL); /* Impossible. Can't even reject the connection. */ + assert(event->id->verbs != NULL); /* Impossible. No way to handle this. */ + + rdma_param = &event->param.conn; + if (rdma_param->private_data == NULL || + rdma_param->private_data_len < sizeof(struct spdk_nvmf_rdma_request_private_data)) { + SPDK_ERRLOG("connect request: no private data provided\n"); + nvmf_rdma_event_reject(event->id, SPDK_NVMF_RDMA_ERROR_INVALID_PRIVATE_DATA_LENGTH); + return -1; + } + + private_data = rdma_param->private_data; + if (private_data->recfmt != 0) { + SPDK_ERRLOG("Received RDMA private data with RECFMT != 0\n"); + nvmf_rdma_event_reject(event->id, SPDK_NVMF_RDMA_ERROR_INVALID_RECFMT); + return -1; + } + + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Connect Recv on fabric intf name %s, dev_name %s\n", + event->id->verbs->device->name, event->id->verbs->device->dev_name); + + port = event->listen_id->context; + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Listen Id was %p with verbs %p. ListenAddr: %p\n", + event->listen_id, event->listen_id->verbs, port); + + /* Figure out the supported queue depth. This is a multi-step process + * that takes into account hardware maximums, host provided values, + * and our target's internal memory limits */ + + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Calculating Queue Depth\n"); + + /* Start with the maximum queue depth allowed by the target */ + max_queue_depth = rtransport->transport.opts.max_queue_depth; + max_read_depth = rtransport->transport.opts.max_queue_depth; + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Target Max Queue Depth: %d\n", + rtransport->transport.opts.max_queue_depth); + + /* Next check the local NIC's hardware limitations */ + SPDK_DEBUGLOG(SPDK_LOG_RDMA, + "Local NIC Max Send/Recv Queue Depth: %d Max Read/Write Queue Depth: %d\n", + port->device->attr.max_qp_wr, port->device->attr.max_qp_rd_atom); + max_queue_depth = spdk_min(max_queue_depth, port->device->attr.max_qp_wr); + max_read_depth = spdk_min(max_read_depth, port->device->attr.max_qp_init_rd_atom); + + /* Next check the remote NIC's hardware limitations */ + SPDK_DEBUGLOG(SPDK_LOG_RDMA, + "Host (Initiator) NIC Max Incoming RDMA R/W operations: %d Max Outgoing RDMA R/W operations: %d\n", + rdma_param->initiator_depth, rdma_param->responder_resources); + if (rdma_param->initiator_depth > 0) { + max_read_depth = spdk_min(max_read_depth, rdma_param->initiator_depth); + } + + /* Finally check for the host software requested values, which are + * optional. */ + if (rdma_param->private_data != NULL && + rdma_param->private_data_len >= sizeof(struct spdk_nvmf_rdma_request_private_data)) { + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Host Receive Queue Size: %d\n", private_data->hrqsize); + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Host Send Queue Size: %d\n", private_data->hsqsize); + max_queue_depth = spdk_min(max_queue_depth, private_data->hrqsize); + max_queue_depth = spdk_min(max_queue_depth, private_data->hsqsize + 1); + } + + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Final Negotiated Queue Depth: %d R/W Depth: %d\n", + max_queue_depth, max_read_depth); + + rqpair = calloc(1, sizeof(struct spdk_nvmf_rdma_qpair)); + if (rqpair == NULL) { + SPDK_ERRLOG("Could not allocate new connection.\n"); + nvmf_rdma_event_reject(event->id, SPDK_NVMF_RDMA_ERROR_NO_RESOURCES); + return -1; + } + + rqpair->device = port->device; + rqpair->max_queue_depth = max_queue_depth; + rqpair->max_read_depth = max_read_depth; + rqpair->cm_id = event->id; + rqpair->listen_id = event->listen_id; + rqpair->qpair.transport = transport; + STAILQ_INIT(&rqpair->ibv_events); + /* use qid from the private data to determine the qpair type + qid will be set to the appropriate value when the controller is created */ + rqpair->qpair.qid = private_data->qid; + + event->id->context = &rqpair->qpair; + + spdk_nvmf_tgt_new_qpair(transport->tgt, &rqpair->qpair); + + return 0; +} + +static int +nvmf_rdma_mem_notify(void *cb_ctx, struct spdk_mem_map *map, + enum spdk_mem_map_notify_action action, + void *vaddr, size_t size) +{ + struct ibv_pd *pd = cb_ctx; + struct ibv_mr *mr; + int rc; + + switch (action) { + case SPDK_MEM_MAP_NOTIFY_REGISTER: + if (!g_nvmf_hooks.get_rkey) { + mr = ibv_reg_mr(pd, vaddr, size, + IBV_ACCESS_LOCAL_WRITE | + IBV_ACCESS_REMOTE_READ | + IBV_ACCESS_REMOTE_WRITE); + if (mr == NULL) { + SPDK_ERRLOG("ibv_reg_mr() failed\n"); + return -1; + } else { + rc = spdk_mem_map_set_translation(map, (uint64_t)vaddr, size, (uint64_t)mr); + } + } else { + rc = spdk_mem_map_set_translation(map, (uint64_t)vaddr, size, + g_nvmf_hooks.get_rkey(pd, vaddr, size)); + } + break; + case SPDK_MEM_MAP_NOTIFY_UNREGISTER: + if (!g_nvmf_hooks.get_rkey) { + mr = (struct ibv_mr *)spdk_mem_map_translate(map, (uint64_t)vaddr, NULL); + if (mr) { + ibv_dereg_mr(mr); + } + } + rc = spdk_mem_map_clear_translation(map, (uint64_t)vaddr, size); + break; + default: + SPDK_UNREACHABLE(); + } + + return rc; +} + +static int +nvmf_rdma_check_contiguous_entries(uint64_t addr_1, uint64_t addr_2) +{ + /* Two contiguous mappings will point to the same address which is the start of the RDMA MR. */ + return addr_1 == addr_2; +} + +static inline void +nvmf_rdma_setup_wr(struct ibv_send_wr *wr, struct ibv_send_wr *next, + enum spdk_nvme_data_transfer xfer) +{ + if (xfer == SPDK_NVME_DATA_CONTROLLER_TO_HOST) { + wr->opcode = IBV_WR_RDMA_WRITE; + wr->send_flags = 0; + wr->next = next; + } else if (xfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER) { + wr->opcode = IBV_WR_RDMA_READ; + wr->send_flags = IBV_SEND_SIGNALED; + wr->next = NULL; + } else { + assert(0); + } +} + +static int +nvmf_request_alloc_wrs(struct spdk_nvmf_rdma_transport *rtransport, + struct spdk_nvmf_rdma_request *rdma_req, + uint32_t num_sgl_descriptors) +{ + struct spdk_nvmf_rdma_request_data *work_requests[SPDK_NVMF_MAX_SGL_ENTRIES]; + struct spdk_nvmf_rdma_request_data *current_data_wr; + uint32_t i; + + if (num_sgl_descriptors > SPDK_NVMF_MAX_SGL_ENTRIES) { + SPDK_ERRLOG("Requested too much entries (%u), the limit is %u\n", + num_sgl_descriptors, SPDK_NVMF_MAX_SGL_ENTRIES); + return -EINVAL; + } + + if (spdk_mempool_get_bulk(rtransport->data_wr_pool, (void **)work_requests, num_sgl_descriptors)) { + return -ENOMEM; + } + + current_data_wr = &rdma_req->data; + + for (i = 0; i < num_sgl_descriptors; i++) { + nvmf_rdma_setup_wr(¤t_data_wr->wr, &work_requests[i]->wr, rdma_req->req.xfer); + current_data_wr->wr.next = &work_requests[i]->wr; + current_data_wr = work_requests[i]; + current_data_wr->wr.sg_list = current_data_wr->sgl; + current_data_wr->wr.wr_id = rdma_req->data.wr.wr_id; + } + + nvmf_rdma_setup_wr(¤t_data_wr->wr, &rdma_req->rsp.wr, rdma_req->req.xfer); + + return 0; +} + +static inline void +nvmf_rdma_setup_request(struct spdk_nvmf_rdma_request *rdma_req) +{ + struct ibv_send_wr *wr = &rdma_req->data.wr; + struct spdk_nvme_sgl_descriptor *sgl = &rdma_req->req.cmd->nvme_cmd.dptr.sgl1; + + wr->wr.rdma.rkey = sgl->keyed.key; + wr->wr.rdma.remote_addr = sgl->address; + nvmf_rdma_setup_wr(wr, &rdma_req->rsp.wr, rdma_req->req.xfer); +} + +static inline void +nvmf_rdma_update_remote_addr(struct spdk_nvmf_rdma_request *rdma_req, uint32_t num_wrs) +{ + struct ibv_send_wr *wr = &rdma_req->data.wr; + struct spdk_nvme_sgl_descriptor *sgl = &rdma_req->req.cmd->nvme_cmd.dptr.sgl1; + uint32_t i; + int j; + uint64_t remote_addr_offset = 0; + + for (i = 0; i < num_wrs; ++i) { + wr->wr.rdma.rkey = sgl->keyed.key; + wr->wr.rdma.remote_addr = sgl->address + remote_addr_offset; + for (j = 0; j < wr->num_sge; ++j) { + remote_addr_offset += wr->sg_list[j].length; + } + wr = wr->next; + } +} + +/* This function is used in the rare case that we have a buffer split over multiple memory regions. */ +static int +nvmf_rdma_replace_buffer(struct spdk_nvmf_rdma_poll_group *rgroup, void **buf) +{ + struct spdk_nvmf_transport_poll_group *group = &rgroup->group; + struct spdk_nvmf_transport *transport = group->transport; + struct spdk_nvmf_transport_pg_cache_buf *old_buf; + void *new_buf; + + if (!(STAILQ_EMPTY(&group->buf_cache))) { + group->buf_cache_count--; + new_buf = STAILQ_FIRST(&group->buf_cache); + STAILQ_REMOVE_HEAD(&group->buf_cache, link); + assert(*buf != NULL); + } else { + new_buf = spdk_mempool_get(transport->data_buf_pool); + } + + if (*buf == NULL) { + return -ENOMEM; + } + + old_buf = *buf; + STAILQ_INSERT_HEAD(&rgroup->retired_bufs, old_buf, link); + *buf = new_buf; + return 0; +} + +static bool +nvmf_rdma_get_lkey(struct spdk_nvmf_rdma_device *device, struct iovec *iov, + uint32_t *_lkey) +{ + uint64_t translation_len; + uint32_t lkey; + + translation_len = iov->iov_len; + + if (!g_nvmf_hooks.get_rkey) { + lkey = ((struct ibv_mr *)spdk_mem_map_translate(device->map, + (uint64_t)iov->iov_base, &translation_len))->lkey; + } else { + lkey = spdk_mem_map_translate(device->map, + (uint64_t)iov->iov_base, &translation_len); + } + + if (spdk_unlikely(translation_len < iov->iov_len)) { + return false; + } + + *_lkey = lkey; + return true; +} + +static bool +nvmf_rdma_fill_wr_sge(struct spdk_nvmf_rdma_device *device, + struct iovec *iov, struct ibv_send_wr **_wr, + uint32_t *_remaining_data_block, uint32_t *_offset, + uint32_t *_num_extra_wrs, + const struct spdk_dif_ctx *dif_ctx) +{ + struct ibv_send_wr *wr = *_wr; + struct ibv_sge *sg_ele = &wr->sg_list[wr->num_sge]; + uint32_t lkey = 0; + uint32_t remaining, data_block_size, md_size, sge_len; + + if (spdk_unlikely(!nvmf_rdma_get_lkey(device, iov, &lkey))) { + /* This is a very rare case that can occur when using DPDK version < 19.05 */ + SPDK_ERRLOG("Data buffer split over multiple RDMA Memory Regions. Removing it from circulation.\n"); + return false; + } + + if (spdk_likely(!dif_ctx)) { + sg_ele->lkey = lkey; + sg_ele->addr = (uintptr_t)(iov->iov_base); + sg_ele->length = iov->iov_len; + wr->num_sge++; + } else { + remaining = iov->iov_len - *_offset; + data_block_size = dif_ctx->block_size - dif_ctx->md_size; + md_size = dif_ctx->md_size; + + while (remaining) { + if (wr->num_sge >= SPDK_NVMF_MAX_SGL_ENTRIES) { + if (*_num_extra_wrs > 0 && wr->next) { + *_wr = wr->next; + wr = *_wr; + wr->num_sge = 0; + sg_ele = &wr->sg_list[wr->num_sge]; + (*_num_extra_wrs)--; + } else { + break; + } + } + sg_ele->lkey = lkey; + sg_ele->addr = (uintptr_t)((char *)iov->iov_base + *_offset); + sge_len = spdk_min(remaining, *_remaining_data_block); + sg_ele->length = sge_len; + remaining -= sge_len; + *_remaining_data_block -= sge_len; + *_offset += sge_len; + + sg_ele++; + wr->num_sge++; + + if (*_remaining_data_block == 0) { + /* skip metadata */ + *_offset += md_size; + /* Metadata that do not fit this IO buffer will be included in the next IO buffer */ + remaining -= spdk_min(remaining, md_size); + *_remaining_data_block = data_block_size; + } + + if (remaining == 0) { + /* By subtracting the size of the last IOV from the offset, we ensure that we skip + the remaining metadata bits at the beginning of the next buffer */ + *_offset -= iov->iov_len; + } + } + } + + return true; +} + +static int +nvmf_rdma_fill_wr_sgl(struct spdk_nvmf_rdma_poll_group *rgroup, + struct spdk_nvmf_rdma_device *device, + struct spdk_nvmf_rdma_request *rdma_req, + struct ibv_send_wr *wr, + uint32_t length, + uint32_t num_extra_wrs) +{ + struct spdk_nvmf_request *req = &rdma_req->req; + struct spdk_dif_ctx *dif_ctx = NULL; + uint32_t remaining_data_block = 0; + uint32_t offset = 0; + + if (spdk_unlikely(rdma_req->req.dif.dif_insert_or_strip)) { + dif_ctx = &rdma_req->req.dif.dif_ctx; + remaining_data_block = dif_ctx->block_size - dif_ctx->md_size; + } + + wr->num_sge = 0; + + while (length && (num_extra_wrs || wr->num_sge < SPDK_NVMF_MAX_SGL_ENTRIES)) { + while (spdk_unlikely(!nvmf_rdma_fill_wr_sge(device, &req->iov[rdma_req->iovpos], &wr, + &remaining_data_block, &offset, &num_extra_wrs, dif_ctx))) { + if (nvmf_rdma_replace_buffer(rgroup, &req->buffers[rdma_req->iovpos]) == -ENOMEM) { + return -ENOMEM; + } + req->iov[rdma_req->iovpos].iov_base = (void *)((uintptr_t)(req->buffers[rdma_req->iovpos] + + NVMF_DATA_BUFFER_MASK) & + ~NVMF_DATA_BUFFER_MASK); + } + + length -= req->iov[rdma_req->iovpos].iov_len; + rdma_req->iovpos++; + } + + if (length) { + SPDK_ERRLOG("Not enough SG entries to hold data buffer\n"); + return -EINVAL; + } + + return 0; +} + +static inline uint32_t +nvmf_rdma_calc_num_wrs(uint32_t length, uint32_t io_unit_size, uint32_t block_size) +{ + /* estimate the number of SG entries and WRs needed to process the request */ + uint32_t num_sge = 0; + uint32_t i; + uint32_t num_buffers = SPDK_CEIL_DIV(length, io_unit_size); + + for (i = 0; i < num_buffers && length > 0; i++) { + uint32_t buffer_len = spdk_min(length, io_unit_size); + uint32_t num_sge_in_block = SPDK_CEIL_DIV(buffer_len, block_size); + + if (num_sge_in_block * block_size > buffer_len) { + ++num_sge_in_block; + } + num_sge += num_sge_in_block; + length -= buffer_len; + } + return SPDK_CEIL_DIV(num_sge, SPDK_NVMF_MAX_SGL_ENTRIES); +} + +static int +nvmf_rdma_request_fill_iovs(struct spdk_nvmf_rdma_transport *rtransport, + struct spdk_nvmf_rdma_device *device, + struct spdk_nvmf_rdma_request *rdma_req, + uint32_t length) +{ + struct spdk_nvmf_rdma_qpair *rqpair; + struct spdk_nvmf_rdma_poll_group *rgroup; + struct spdk_nvmf_request *req = &rdma_req->req; + struct ibv_send_wr *wr = &rdma_req->data.wr; + int rc; + uint32_t num_wrs = 1; + + rqpair = SPDK_CONTAINEROF(req->qpair, struct spdk_nvmf_rdma_qpair, qpair); + rgroup = rqpair->poller->group; + + /* rdma wr specifics */ + nvmf_rdma_setup_request(rdma_req); + + rc = spdk_nvmf_request_get_buffers(req, &rgroup->group, &rtransport->transport, + length); + if (rc != 0) { + return rc; + } + + assert(req->iovcnt <= rqpair->max_send_sge); + + rdma_req->iovpos = 0; + + if (spdk_unlikely(req->dif.dif_insert_or_strip)) { + num_wrs = nvmf_rdma_calc_num_wrs(length, rtransport->transport.opts.io_unit_size, + req->dif.dif_ctx.block_size); + if (num_wrs > 1) { + rc = nvmf_request_alloc_wrs(rtransport, rdma_req, num_wrs - 1); + if (rc != 0) { + goto err_exit; + } + } + } + + rc = nvmf_rdma_fill_wr_sgl(rgroup, device, rdma_req, wr, length, num_wrs - 1); + if (spdk_unlikely(rc != 0)) { + goto err_exit; + } + + if (spdk_unlikely(num_wrs > 1)) { + nvmf_rdma_update_remote_addr(rdma_req, num_wrs); + } + + /* set the number of outstanding data WRs for this request. */ + rdma_req->num_outstanding_data_wr = num_wrs; + + return rc; + +err_exit: + spdk_nvmf_request_free_buffers(req, &rgroup->group, &rtransport->transport); + nvmf_rdma_request_free_data(rdma_req, rtransport); + req->iovcnt = 0; + return rc; +} + +static int +nvmf_rdma_request_fill_iovs_multi_sgl(struct spdk_nvmf_rdma_transport *rtransport, + struct spdk_nvmf_rdma_device *device, + struct spdk_nvmf_rdma_request *rdma_req) +{ + struct spdk_nvmf_rdma_qpair *rqpair; + struct spdk_nvmf_rdma_poll_group *rgroup; + struct ibv_send_wr *current_wr; + struct spdk_nvmf_request *req = &rdma_req->req; + struct spdk_nvme_sgl_descriptor *inline_segment, *desc; + uint32_t num_sgl_descriptors; + uint32_t lengths[SPDK_NVMF_MAX_SGL_ENTRIES]; + uint32_t i; + int rc; + + rqpair = SPDK_CONTAINEROF(rdma_req->req.qpair, struct spdk_nvmf_rdma_qpair, qpair); + rgroup = rqpair->poller->group; + + inline_segment = &req->cmd->nvme_cmd.dptr.sgl1; + assert(inline_segment->generic.type == SPDK_NVME_SGL_TYPE_LAST_SEGMENT); + assert(inline_segment->unkeyed.subtype == SPDK_NVME_SGL_SUBTYPE_OFFSET); + + num_sgl_descriptors = inline_segment->unkeyed.length / sizeof(struct spdk_nvme_sgl_descriptor); + assert(num_sgl_descriptors <= SPDK_NVMF_MAX_SGL_ENTRIES); + + if (nvmf_request_alloc_wrs(rtransport, rdma_req, num_sgl_descriptors - 1) != 0) { + return -ENOMEM; + } + + desc = (struct spdk_nvme_sgl_descriptor *)rdma_req->recv->buf + inline_segment->address; + for (i = 0; i < num_sgl_descriptors; i++) { + if (spdk_likely(!req->dif.dif_insert_or_strip)) { + lengths[i] = desc->keyed.length; + } else { + req->dif.orig_length += desc->keyed.length; + lengths[i] = spdk_dif_get_length_with_md(desc->keyed.length, &req->dif.dif_ctx); + req->dif.elba_length += lengths[i]; + } + desc++; + } + + rc = spdk_nvmf_request_get_buffers_multi(req, &rgroup->group, &rtransport->transport, + lengths, num_sgl_descriptors); + if (rc != 0) { + nvmf_rdma_request_free_data(rdma_req, rtransport); + return rc; + } + + /* The first WR must always be the embedded data WR. This is how we unwind them later. */ + current_wr = &rdma_req->data.wr; + assert(current_wr != NULL); + + req->length = 0; + rdma_req->iovpos = 0; + desc = (struct spdk_nvme_sgl_descriptor *)rdma_req->recv->buf + inline_segment->address; + for (i = 0; i < num_sgl_descriptors; i++) { + /* The descriptors must be keyed data block descriptors with an address, not an offset. */ + if (spdk_unlikely(desc->generic.type != SPDK_NVME_SGL_TYPE_KEYED_DATA_BLOCK || + desc->keyed.subtype != SPDK_NVME_SGL_SUBTYPE_ADDRESS)) { + rc = -EINVAL; + goto err_exit; + } + + current_wr->num_sge = 0; + + rc = nvmf_rdma_fill_wr_sgl(rgroup, device, rdma_req, current_wr, lengths[i], 0); + if (rc != 0) { + rc = -ENOMEM; + goto err_exit; + } + + req->length += desc->keyed.length; + current_wr->wr.rdma.rkey = desc->keyed.key; + current_wr->wr.rdma.remote_addr = desc->address; + current_wr = current_wr->next; + desc++; + } + +#ifdef SPDK_CONFIG_RDMA_SEND_WITH_INVAL + /* Go back to the last descriptor in the list. */ + desc--; + if ((device->attr.device_cap_flags & IBV_DEVICE_MEM_MGT_EXTENSIONS) != 0) { + if (desc->keyed.subtype == SPDK_NVME_SGL_SUBTYPE_INVALIDATE_KEY) { + rdma_req->rsp.wr.opcode = IBV_WR_SEND_WITH_INV; + rdma_req->rsp.wr.imm_data = desc->keyed.key; + } + } +#endif + + rdma_req->num_outstanding_data_wr = num_sgl_descriptors; + + return 0; + +err_exit: + spdk_nvmf_request_free_buffers(req, &rgroup->group, &rtransport->transport); + nvmf_rdma_request_free_data(rdma_req, rtransport); + return rc; +} + +static int +nvmf_rdma_request_parse_sgl(struct spdk_nvmf_rdma_transport *rtransport, + struct spdk_nvmf_rdma_device *device, + struct spdk_nvmf_rdma_request *rdma_req) +{ + struct spdk_nvmf_request *req = &rdma_req->req; + struct spdk_nvme_cpl *rsp; + struct spdk_nvme_sgl_descriptor *sgl; + int rc; + uint32_t length; + + rsp = &req->rsp->nvme_cpl; + sgl = &req->cmd->nvme_cmd.dptr.sgl1; + + if (sgl->generic.type == SPDK_NVME_SGL_TYPE_KEYED_DATA_BLOCK && + (sgl->keyed.subtype == SPDK_NVME_SGL_SUBTYPE_ADDRESS || + sgl->keyed.subtype == SPDK_NVME_SGL_SUBTYPE_INVALIDATE_KEY)) { + + length = sgl->keyed.length; + if (length > rtransport->transport.opts.max_io_size) { + SPDK_ERRLOG("SGL length 0x%x exceeds max io size 0x%x\n", + length, rtransport->transport.opts.max_io_size); + rsp->status.sc = SPDK_NVME_SC_DATA_SGL_LENGTH_INVALID; + return -1; + } +#ifdef SPDK_CONFIG_RDMA_SEND_WITH_INVAL + if ((device->attr.device_cap_flags & IBV_DEVICE_MEM_MGT_EXTENSIONS) != 0) { + if (sgl->keyed.subtype == SPDK_NVME_SGL_SUBTYPE_INVALIDATE_KEY) { + rdma_req->rsp.wr.opcode = IBV_WR_SEND_WITH_INV; + rdma_req->rsp.wr.imm_data = sgl->keyed.key; + } + } +#endif + + /* fill request length and populate iovs */ + req->length = length; + + if (spdk_unlikely(req->dif.dif_insert_or_strip)) { + req->dif.orig_length = length; + length = spdk_dif_get_length_with_md(length, &req->dif.dif_ctx); + req->dif.elba_length = length; + } + + rc = nvmf_rdma_request_fill_iovs(rtransport, device, rdma_req, length); + if (spdk_unlikely(rc < 0)) { + if (rc == -EINVAL) { + SPDK_ERRLOG("SGL length exceeds the max I/O size\n"); + rsp->status.sc = SPDK_NVME_SC_DATA_SGL_LENGTH_INVALID; + return -1; + } + /* No available buffers. Queue this request up. */ + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "No available large data buffers. Queueing request %p\n", rdma_req); + return 0; + } + + /* backward compatible */ + req->data = req->iov[0].iov_base; + + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Request %p took %d buffer/s from central pool\n", rdma_req, + req->iovcnt); + + return 0; + } else if (sgl->generic.type == SPDK_NVME_SGL_TYPE_DATA_BLOCK && + sgl->unkeyed.subtype == SPDK_NVME_SGL_SUBTYPE_OFFSET) { + uint64_t offset = sgl->address; + uint32_t max_len = rtransport->transport.opts.in_capsule_data_size; + + SPDK_DEBUGLOG(SPDK_LOG_NVMF, "In-capsule data: offset 0x%" PRIx64 ", length 0x%x\n", + offset, sgl->unkeyed.length); + + if (offset > max_len) { + SPDK_ERRLOG("In-capsule offset 0x%" PRIx64 " exceeds capsule length 0x%x\n", + offset, max_len); + rsp->status.sc = SPDK_NVME_SC_INVALID_SGL_OFFSET; + return -1; + } + max_len -= (uint32_t)offset; + + if (sgl->unkeyed.length > max_len) { + SPDK_ERRLOG("In-capsule data length 0x%x exceeds capsule length 0x%x\n", + sgl->unkeyed.length, max_len); + rsp->status.sc = SPDK_NVME_SC_DATA_SGL_LENGTH_INVALID; + return -1; + } + + rdma_req->num_outstanding_data_wr = 0; + req->data = rdma_req->recv->buf + offset; + req->data_from_pool = false; + req->length = sgl->unkeyed.length; + + req->iov[0].iov_base = req->data; + req->iov[0].iov_len = req->length; + req->iovcnt = 1; + + return 0; + } else if (sgl->generic.type == SPDK_NVME_SGL_TYPE_LAST_SEGMENT && + sgl->unkeyed.subtype == SPDK_NVME_SGL_SUBTYPE_OFFSET) { + + rc = nvmf_rdma_request_fill_iovs_multi_sgl(rtransport, device, rdma_req); + if (rc == -ENOMEM) { + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "No available large data buffers. Queueing request %p\n", rdma_req); + return 0; + } else if (rc == -EINVAL) { + SPDK_ERRLOG("Multi SGL element request length exceeds the max I/O size\n"); + rsp->status.sc = SPDK_NVME_SC_DATA_SGL_LENGTH_INVALID; + return -1; + } + + /* backward compatible */ + req->data = req->iov[0].iov_base; + + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Request %p took %d buffer/s from central pool\n", rdma_req, + req->iovcnt); + + return 0; + } + + SPDK_ERRLOG("Invalid NVMf I/O Command SGL: Type 0x%x, Subtype 0x%x\n", + sgl->generic.type, sgl->generic.subtype); + rsp->status.sc = SPDK_NVME_SC_SGL_DESCRIPTOR_TYPE_INVALID; + return -1; +} + +static void +_nvmf_rdma_request_free(struct spdk_nvmf_rdma_request *rdma_req, + struct spdk_nvmf_rdma_transport *rtransport) +{ + struct spdk_nvmf_rdma_qpair *rqpair; + struct spdk_nvmf_rdma_poll_group *rgroup; + + rqpair = SPDK_CONTAINEROF(rdma_req->req.qpair, struct spdk_nvmf_rdma_qpair, qpair); + if (rdma_req->req.data_from_pool) { + rgroup = rqpair->poller->group; + + spdk_nvmf_request_free_buffers(&rdma_req->req, &rgroup->group, &rtransport->transport); + } + nvmf_rdma_request_free_data(rdma_req, rtransport); + rdma_req->req.length = 0; + rdma_req->req.iovcnt = 0; + rdma_req->req.data = NULL; + rdma_req->rsp.wr.next = NULL; + rdma_req->data.wr.next = NULL; + memset(&rdma_req->req.dif, 0, sizeof(rdma_req->req.dif)); + rqpair->qd--; + + STAILQ_INSERT_HEAD(&rqpair->resources->free_queue, rdma_req, state_link); + rdma_req->state = RDMA_REQUEST_STATE_FREE; +} + +bool +nvmf_rdma_request_process(struct spdk_nvmf_rdma_transport *rtransport, + struct spdk_nvmf_rdma_request *rdma_req) +{ + struct spdk_nvmf_rdma_qpair *rqpair; + struct spdk_nvmf_rdma_device *device; + struct spdk_nvmf_rdma_poll_group *rgroup; + struct spdk_nvme_cpl *rsp = &rdma_req->req.rsp->nvme_cpl; + int rc; + struct spdk_nvmf_rdma_recv *rdma_recv; + enum spdk_nvmf_rdma_request_state prev_state; + bool progress = false; + int data_posted; + uint32_t num_blocks; + + rqpair = SPDK_CONTAINEROF(rdma_req->req.qpair, struct spdk_nvmf_rdma_qpair, qpair); + device = rqpair->device; + rgroup = rqpair->poller->group; + + assert(rdma_req->state != RDMA_REQUEST_STATE_FREE); + + /* If the queue pair is in an error state, force the request to the completed state + * to release resources. */ + if (rqpair->ibv_state == IBV_QPS_ERR || rqpair->qpair.state != SPDK_NVMF_QPAIR_ACTIVE) { + if (rdma_req->state == RDMA_REQUEST_STATE_NEED_BUFFER) { + STAILQ_REMOVE(&rgroup->group.pending_buf_queue, &rdma_req->req, spdk_nvmf_request, buf_link); + } else if (rdma_req->state == RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING) { + STAILQ_REMOVE(&rqpair->pending_rdma_read_queue, rdma_req, spdk_nvmf_rdma_request, state_link); + } else if (rdma_req->state == RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING) { + STAILQ_REMOVE(&rqpair->pending_rdma_write_queue, rdma_req, spdk_nvmf_rdma_request, state_link); + } + rdma_req->state = RDMA_REQUEST_STATE_COMPLETED; + } + + /* The loop here is to allow for several back-to-back state changes. */ + do { + prev_state = rdma_req->state; + + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Request %p entering state %d\n", rdma_req, prev_state); + + switch (rdma_req->state) { + case RDMA_REQUEST_STATE_FREE: + /* Some external code must kick a request into RDMA_REQUEST_STATE_NEW + * to escape this state. */ + break; + case RDMA_REQUEST_STATE_NEW: + spdk_trace_record(TRACE_RDMA_REQUEST_STATE_NEW, 0, 0, + (uintptr_t)rdma_req, (uintptr_t)rqpair->cm_id); + rdma_recv = rdma_req->recv; + + /* The first element of the SGL is the NVMe command */ + rdma_req->req.cmd = (union nvmf_h2c_msg *)rdma_recv->sgl[0].addr; + memset(rdma_req->req.rsp, 0, sizeof(*rdma_req->req.rsp)); + + if (rqpair->ibv_state == IBV_QPS_ERR || rqpair->qpair.state != SPDK_NVMF_QPAIR_ACTIVE) { + rdma_req->state = RDMA_REQUEST_STATE_COMPLETED; + break; + } + + if (spdk_unlikely(spdk_nvmf_request_get_dif_ctx(&rdma_req->req, &rdma_req->req.dif.dif_ctx))) { + rdma_req->req.dif.dif_insert_or_strip = true; + } + +#ifdef SPDK_CONFIG_RDMA_SEND_WITH_INVAL + rdma_req->rsp.wr.opcode = IBV_WR_SEND; + rdma_req->rsp.wr.imm_data = 0; +#endif + + /* The next state transition depends on the data transfer needs of this request. */ + rdma_req->req.xfer = spdk_nvmf_req_get_xfer(&rdma_req->req); + + /* If no data to transfer, ready to execute. */ + if (rdma_req->req.xfer == SPDK_NVME_DATA_NONE) { + rdma_req->state = RDMA_REQUEST_STATE_READY_TO_EXECUTE; + break; + } + + rdma_req->state = RDMA_REQUEST_STATE_NEED_BUFFER; + STAILQ_INSERT_TAIL(&rgroup->group.pending_buf_queue, &rdma_req->req, buf_link); + break; + case RDMA_REQUEST_STATE_NEED_BUFFER: + spdk_trace_record(TRACE_RDMA_REQUEST_STATE_NEED_BUFFER, 0, 0, + (uintptr_t)rdma_req, (uintptr_t)rqpair->cm_id); + + assert(rdma_req->req.xfer != SPDK_NVME_DATA_NONE); + + if (&rdma_req->req != STAILQ_FIRST(&rgroup->group.pending_buf_queue)) { + /* This request needs to wait in line to obtain a buffer */ + break; + } + + /* Try to get a data buffer */ + rc = nvmf_rdma_request_parse_sgl(rtransport, device, rdma_req); + if (rc < 0) { + STAILQ_REMOVE_HEAD(&rgroup->group.pending_buf_queue, buf_link); + rdma_req->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE; + break; + } + + if (!rdma_req->req.data) { + /* No buffers available. */ + rgroup->stat.pending_data_buffer++; + break; + } + + STAILQ_REMOVE_HEAD(&rgroup->group.pending_buf_queue, buf_link); + + /* If data is transferring from host to controller and the data didn't + * arrive using in capsule data, we need to do a transfer from the host. + */ + if (rdma_req->req.xfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER && + rdma_req->req.data_from_pool) { + STAILQ_INSERT_TAIL(&rqpair->pending_rdma_read_queue, rdma_req, state_link); + rdma_req->state = RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING; + break; + } + + rdma_req->state = RDMA_REQUEST_STATE_READY_TO_EXECUTE; + break; + case RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING: + spdk_trace_record(TRACE_RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING, 0, 0, + (uintptr_t)rdma_req, (uintptr_t)rqpair->cm_id); + + if (rdma_req != STAILQ_FIRST(&rqpair->pending_rdma_read_queue)) { + /* This request needs to wait in line to perform RDMA */ + break; + } + if (rqpair->current_send_depth + rdma_req->num_outstanding_data_wr > rqpair->max_send_depth + || rqpair->current_read_depth + rdma_req->num_outstanding_data_wr > rqpair->max_read_depth) { + /* We can only have so many WRs outstanding. we have to wait until some finish. */ + rqpair->poller->stat.pending_rdma_read++; + break; + } + + /* We have already verified that this request is the head of the queue. */ + STAILQ_REMOVE_HEAD(&rqpair->pending_rdma_read_queue, state_link); + + rc = request_transfer_in(&rdma_req->req); + if (!rc) { + rdma_req->state = RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER; + } else { + rsp->status.sc = SPDK_NVME_SC_INTERNAL_DEVICE_ERROR; + rdma_req->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE; + } + break; + case RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER: + spdk_trace_record(TRACE_RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER, 0, 0, + (uintptr_t)rdma_req, (uintptr_t)rqpair->cm_id); + /* Some external code must kick a request into RDMA_REQUEST_STATE_READY_TO_EXECUTE + * to escape this state. */ + break; + case RDMA_REQUEST_STATE_READY_TO_EXECUTE: + spdk_trace_record(TRACE_RDMA_REQUEST_STATE_READY_TO_EXECUTE, 0, 0, + (uintptr_t)rdma_req, (uintptr_t)rqpair->cm_id); + + if (spdk_unlikely(rdma_req->req.dif.dif_insert_or_strip)) { + if (rdma_req->req.xfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER) { + /* generate DIF for write operation */ + num_blocks = SPDK_CEIL_DIV(rdma_req->req.dif.elba_length, rdma_req->req.dif.dif_ctx.block_size); + assert(num_blocks > 0); + + rc = spdk_dif_generate(rdma_req->req.iov, rdma_req->req.iovcnt, + num_blocks, &rdma_req->req.dif.dif_ctx); + if (rc != 0) { + SPDK_ERRLOG("DIF generation failed\n"); + rdma_req->state = RDMA_REQUEST_STATE_COMPLETED; + nvmf_rdma_start_disconnect(rqpair); + break; + } + } + + assert(rdma_req->req.dif.elba_length >= rdma_req->req.length); + /* set extended length before IO operation */ + rdma_req->req.length = rdma_req->req.dif.elba_length; + } + + rdma_req->state = RDMA_REQUEST_STATE_EXECUTING; + spdk_nvmf_request_exec(&rdma_req->req); + break; + case RDMA_REQUEST_STATE_EXECUTING: + spdk_trace_record(TRACE_RDMA_REQUEST_STATE_EXECUTING, 0, 0, + (uintptr_t)rdma_req, (uintptr_t)rqpair->cm_id); + /* Some external code must kick a request into RDMA_REQUEST_STATE_EXECUTED + * to escape this state. */ + break; + case RDMA_REQUEST_STATE_EXECUTED: + spdk_trace_record(TRACE_RDMA_REQUEST_STATE_EXECUTED, 0, 0, + (uintptr_t)rdma_req, (uintptr_t)rqpair->cm_id); + if (rsp->status.sc == SPDK_NVME_SC_SUCCESS && + rdma_req->req.xfer == SPDK_NVME_DATA_CONTROLLER_TO_HOST) { + STAILQ_INSERT_TAIL(&rqpair->pending_rdma_write_queue, rdma_req, state_link); + rdma_req->state = RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING; + } else { + rdma_req->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE; + } + if (spdk_unlikely(rdma_req->req.dif.dif_insert_or_strip)) { + /* restore the original length */ + rdma_req->req.length = rdma_req->req.dif.orig_length; + + if (rdma_req->req.xfer == SPDK_NVME_DATA_CONTROLLER_TO_HOST) { + struct spdk_dif_error error_blk; + + num_blocks = SPDK_CEIL_DIV(rdma_req->req.dif.elba_length, rdma_req->req.dif.dif_ctx.block_size); + + rc = spdk_dif_verify(rdma_req->req.iov, rdma_req->req.iovcnt, num_blocks, + &rdma_req->req.dif.dif_ctx, &error_blk); + if (rc) { + struct spdk_nvme_cpl *rsp = &rdma_req->req.rsp->nvme_cpl; + + SPDK_ERRLOG("DIF error detected. type=%d, offset=%" PRIu32 "\n", error_blk.err_type, + error_blk.err_offset); + rsp->status.sct = SPDK_NVME_SCT_MEDIA_ERROR; + rsp->status.sc = nvmf_rdma_dif_error_to_compl_status(error_blk.err_type); + rdma_req->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE; + STAILQ_REMOVE(&rqpair->pending_rdma_write_queue, rdma_req, spdk_nvmf_rdma_request, state_link); + } + } + } + break; + case RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING: + spdk_trace_record(TRACE_RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING, 0, 0, + (uintptr_t)rdma_req, (uintptr_t)rqpair->cm_id); + + if (rdma_req != STAILQ_FIRST(&rqpair->pending_rdma_write_queue)) { + /* This request needs to wait in line to perform RDMA */ + break; + } + if ((rqpair->current_send_depth + rdma_req->num_outstanding_data_wr + 1) > + rqpair->max_send_depth) { + /* We can only have so many WRs outstanding. we have to wait until some finish. + * +1 since each request has an additional wr in the resp. */ + rqpair->poller->stat.pending_rdma_write++; + break; + } + + /* We have already verified that this request is the head of the queue. */ + STAILQ_REMOVE_HEAD(&rqpair->pending_rdma_write_queue, state_link); + + /* The data transfer will be kicked off from + * RDMA_REQUEST_STATE_READY_TO_COMPLETE state. + */ + rdma_req->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE; + break; + case RDMA_REQUEST_STATE_READY_TO_COMPLETE: + spdk_trace_record(TRACE_RDMA_REQUEST_STATE_READY_TO_COMPLETE, 0, 0, + (uintptr_t)rdma_req, (uintptr_t)rqpair->cm_id); + rc = request_transfer_out(&rdma_req->req, &data_posted); + assert(rc == 0); /* No good way to handle this currently */ + if (rc) { + rdma_req->state = RDMA_REQUEST_STATE_COMPLETED; + } else { + rdma_req->state = data_posted ? RDMA_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST : + RDMA_REQUEST_STATE_COMPLETING; + } + break; + case RDMA_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST: + spdk_trace_record(TRACE_RDMA_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST, 0, 0, + (uintptr_t)rdma_req, (uintptr_t)rqpair->cm_id); + /* Some external code must kick a request into RDMA_REQUEST_STATE_COMPLETED + * to escape this state. */ + break; + case RDMA_REQUEST_STATE_COMPLETING: + spdk_trace_record(TRACE_RDMA_REQUEST_STATE_COMPLETING, 0, 0, + (uintptr_t)rdma_req, (uintptr_t)rqpair->cm_id); + /* Some external code must kick a request into RDMA_REQUEST_STATE_COMPLETED + * to escape this state. */ + break; + case RDMA_REQUEST_STATE_COMPLETED: + spdk_trace_record(TRACE_RDMA_REQUEST_STATE_COMPLETED, 0, 0, + (uintptr_t)rdma_req, (uintptr_t)rqpair->cm_id); + + rqpair->poller->stat.request_latency += spdk_get_ticks() - rdma_req->receive_tsc; + _nvmf_rdma_request_free(rdma_req, rtransport); + break; + case RDMA_REQUEST_NUM_STATES: + default: + assert(0); + break; + } + + if (rdma_req->state != prev_state) { + progress = true; + } + } while (rdma_req->state != prev_state); + + return progress; +} + +/* Public API callbacks begin here */ + +#define SPDK_NVMF_RDMA_DEFAULT_MAX_QUEUE_DEPTH 128 +#define SPDK_NVMF_RDMA_DEFAULT_AQ_DEPTH 128 +#define SPDK_NVMF_RDMA_DEFAULT_SRQ_DEPTH 4096 +#define SPDK_NVMF_RDMA_DEFAULT_MAX_QPAIRS_PER_CTRLR 128 +#define SPDK_NVMF_RDMA_DEFAULT_IN_CAPSULE_DATA_SIZE 4096 +#define SPDK_NVMF_RDMA_DEFAULT_MAX_IO_SIZE 131072 +#define SPDK_NVMF_RDMA_MIN_IO_BUFFER_SIZE (SPDK_NVMF_RDMA_DEFAULT_MAX_IO_SIZE / SPDK_NVMF_MAX_SGL_ENTRIES) +#define SPDK_NVMF_RDMA_DEFAULT_NUM_SHARED_BUFFERS 4095 +#define SPDK_NVMF_RDMA_DEFAULT_BUFFER_CACHE_SIZE 32 +#define SPDK_NVMF_RDMA_DEFAULT_NO_SRQ false +#define SPDK_NVMF_RDMA_DIF_INSERT_OR_STRIP false +#define SPDK_NVMF_RDMA_ACCEPTOR_BACKLOG 100 +#define SPDK_NVMF_RDMA_DEFAULT_ABORT_TIMEOUT_SEC 1 + +static void +nvmf_rdma_opts_init(struct spdk_nvmf_transport_opts *opts) +{ + opts->max_queue_depth = SPDK_NVMF_RDMA_DEFAULT_MAX_QUEUE_DEPTH; + opts->max_qpairs_per_ctrlr = SPDK_NVMF_RDMA_DEFAULT_MAX_QPAIRS_PER_CTRLR; + opts->in_capsule_data_size = SPDK_NVMF_RDMA_DEFAULT_IN_CAPSULE_DATA_SIZE; + opts->max_io_size = SPDK_NVMF_RDMA_DEFAULT_MAX_IO_SIZE; + opts->io_unit_size = SPDK_NVMF_RDMA_MIN_IO_BUFFER_SIZE; + opts->max_aq_depth = SPDK_NVMF_RDMA_DEFAULT_AQ_DEPTH; + opts->num_shared_buffers = SPDK_NVMF_RDMA_DEFAULT_NUM_SHARED_BUFFERS; + opts->buf_cache_size = SPDK_NVMF_RDMA_DEFAULT_BUFFER_CACHE_SIZE; + opts->max_srq_depth = SPDK_NVMF_RDMA_DEFAULT_SRQ_DEPTH; + opts->no_srq = SPDK_NVMF_RDMA_DEFAULT_NO_SRQ; + opts->dif_insert_or_strip = SPDK_NVMF_RDMA_DIF_INSERT_OR_STRIP; + opts->acceptor_backlog = SPDK_NVMF_RDMA_ACCEPTOR_BACKLOG; + opts->abort_timeout_sec = SPDK_NVMF_RDMA_DEFAULT_ABORT_TIMEOUT_SEC; +} + +const struct spdk_mem_map_ops g_nvmf_rdma_map_ops = { + .notify_cb = nvmf_rdma_mem_notify, + .are_contiguous = nvmf_rdma_check_contiguous_entries +}; + +static int nvmf_rdma_destroy(struct spdk_nvmf_transport *transport); + +static struct spdk_nvmf_transport * +nvmf_rdma_create(struct spdk_nvmf_transport_opts *opts) +{ + int rc; + struct spdk_nvmf_rdma_transport *rtransport; + struct spdk_nvmf_rdma_device *device, *tmp; + struct ibv_context **contexts; + uint32_t i; + int flag; + uint32_t sge_count; + uint32_t min_shared_buffers; + int max_device_sge = SPDK_NVMF_MAX_SGL_ENTRIES; + pthread_mutexattr_t attr; + + rtransport = calloc(1, sizeof(*rtransport)); + if (!rtransport) { + return NULL; + } + + if (pthread_mutexattr_init(&attr)) { + SPDK_ERRLOG("pthread_mutexattr_init() failed\n"); + free(rtransport); + return NULL; + } + + if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE)) { + SPDK_ERRLOG("pthread_mutexattr_settype() failed\n"); + pthread_mutexattr_destroy(&attr); + free(rtransport); + return NULL; + } + + if (pthread_mutex_init(&rtransport->lock, &attr)) { + SPDK_ERRLOG("pthread_mutex_init() failed\n"); + pthread_mutexattr_destroy(&attr); + free(rtransport); + return NULL; + } + + pthread_mutexattr_destroy(&attr); + + TAILQ_INIT(&rtransport->devices); + TAILQ_INIT(&rtransport->ports); + TAILQ_INIT(&rtransport->poll_groups); + + rtransport->transport.ops = &spdk_nvmf_transport_rdma; + + SPDK_INFOLOG(SPDK_LOG_RDMA, "*** RDMA Transport Init ***\n" + " Transport opts: max_ioq_depth=%d, max_io_size=%d,\n" + " max_io_qpairs_per_ctrlr=%d, io_unit_size=%d,\n" + " in_capsule_data_size=%d, max_aq_depth=%d,\n" + " num_shared_buffers=%d, max_srq_depth=%d, no_srq=%d," + " acceptor_backlog=%d, abort_timeout_sec=%d\n", + opts->max_queue_depth, + opts->max_io_size, + opts->max_qpairs_per_ctrlr - 1, + opts->io_unit_size, + opts->in_capsule_data_size, + opts->max_aq_depth, + opts->num_shared_buffers, + opts->max_srq_depth, + opts->no_srq, + opts->acceptor_backlog, + opts->abort_timeout_sec); + + /* I/O unit size cannot be larger than max I/O size */ + if (opts->io_unit_size > opts->max_io_size) { + opts->io_unit_size = opts->max_io_size; + } + + if (opts->acceptor_backlog <= 0) { + SPDK_ERRLOG("The acceptor backlog cannot be less than 1, setting to the default value of (%d).\n", + SPDK_NVMF_RDMA_ACCEPTOR_BACKLOG); + opts->acceptor_backlog = SPDK_NVMF_RDMA_ACCEPTOR_BACKLOG; + } + + if (opts->num_shared_buffers < (SPDK_NVMF_MAX_SGL_ENTRIES * 2)) { + SPDK_ERRLOG("The number of shared data buffers (%d) is less than" + "the minimum number required to guarantee that forward progress can be made (%d)\n", + opts->num_shared_buffers, (SPDK_NVMF_MAX_SGL_ENTRIES * 2)); + nvmf_rdma_destroy(&rtransport->transport); + return NULL; + } + + min_shared_buffers = spdk_thread_get_count() * opts->buf_cache_size; + if (min_shared_buffers > opts->num_shared_buffers) { + SPDK_ERRLOG("There are not enough buffers to satisfy" + "per-poll group caches for each thread. (%" PRIu32 ")" + "supplied. (%" PRIu32 ") required\n", opts->num_shared_buffers, min_shared_buffers); + SPDK_ERRLOG("Please specify a larger number of shared buffers\n"); + nvmf_rdma_destroy(&rtransport->transport); + return NULL; + } + + sge_count = opts->max_io_size / opts->io_unit_size; + if (sge_count > NVMF_DEFAULT_TX_SGE) { + SPDK_ERRLOG("Unsupported IO Unit size specified, %d bytes\n", opts->io_unit_size); + nvmf_rdma_destroy(&rtransport->transport); + return NULL; + } + + rtransport->event_channel = rdma_create_event_channel(); + if (rtransport->event_channel == NULL) { + SPDK_ERRLOG("rdma_create_event_channel() failed, %s\n", spdk_strerror(errno)); + nvmf_rdma_destroy(&rtransport->transport); + return NULL; + } + + flag = fcntl(rtransport->event_channel->fd, F_GETFL); + if (fcntl(rtransport->event_channel->fd, F_SETFL, flag | O_NONBLOCK) < 0) { + SPDK_ERRLOG("fcntl can't set nonblocking mode for socket, fd: %d (%s)\n", + rtransport->event_channel->fd, spdk_strerror(errno)); + nvmf_rdma_destroy(&rtransport->transport); + return NULL; + } + + rtransport->data_wr_pool = spdk_mempool_create("spdk_nvmf_rdma_wr_data", + opts->max_queue_depth * SPDK_NVMF_MAX_SGL_ENTRIES, + sizeof(struct spdk_nvmf_rdma_request_data), + SPDK_MEMPOOL_DEFAULT_CACHE_SIZE, + SPDK_ENV_SOCKET_ID_ANY); + if (!rtransport->data_wr_pool) { + SPDK_ERRLOG("Unable to allocate work request pool for poll group\n"); + nvmf_rdma_destroy(&rtransport->transport); + return NULL; + } + + contexts = rdma_get_devices(NULL); + if (contexts == NULL) { + SPDK_ERRLOG("rdma_get_devices() failed: %s (%d)\n", spdk_strerror(errno), errno); + nvmf_rdma_destroy(&rtransport->transport); + return NULL; + } + + i = 0; + rc = 0; + while (contexts[i] != NULL) { + device = calloc(1, sizeof(*device)); + if (!device) { + SPDK_ERRLOG("Unable to allocate memory for RDMA devices.\n"); + rc = -ENOMEM; + break; + } + device->context = contexts[i]; + rc = ibv_query_device(device->context, &device->attr); + if (rc < 0) { + SPDK_ERRLOG("Failed to query RDMA device attributes.\n"); + free(device); + break; + + } + + max_device_sge = spdk_min(max_device_sge, device->attr.max_sge); + +#ifdef SPDK_CONFIG_RDMA_SEND_WITH_INVAL + if ((device->attr.device_cap_flags & IBV_DEVICE_MEM_MGT_EXTENSIONS) == 0) { + SPDK_WARNLOG("The libibverbs on this system supports SEND_WITH_INVALIDATE,"); + SPDK_WARNLOG("but the device with vendor ID %u does not.\n", device->attr.vendor_id); + } + + /** + * The vendor ID is assigned by the IEEE and an ID of 0 implies Soft-RoCE. + * The Soft-RoCE RXE driver does not currently support send with invalidate, + * but incorrectly reports that it does. There are changes making their way + * through the kernel now that will enable this feature. When they are merged, + * we can conditionally enable this feature. + * + * TODO: enable this for versions of the kernel rxe driver that support it. + */ + if (device->attr.vendor_id == 0) { + device->attr.device_cap_flags &= ~(IBV_DEVICE_MEM_MGT_EXTENSIONS); + } +#endif + + /* set up device context async ev fd as NON_BLOCKING */ + flag = fcntl(device->context->async_fd, F_GETFL); + rc = fcntl(device->context->async_fd, F_SETFL, flag | O_NONBLOCK); + if (rc < 0) { + SPDK_ERRLOG("Failed to set context async fd to NONBLOCK.\n"); + free(device); + break; + } + + TAILQ_INSERT_TAIL(&rtransport->devices, device, link); + i++; + + if (g_nvmf_hooks.get_ibv_pd) { + device->pd = g_nvmf_hooks.get_ibv_pd(NULL, device->context); + } else { + device->pd = ibv_alloc_pd(device->context); + } + + if (!device->pd) { + SPDK_ERRLOG("Unable to allocate protection domain.\n"); + rc = -ENOMEM; + break; + } + + assert(device->map == NULL); + + device->map = spdk_mem_map_alloc(0, &g_nvmf_rdma_map_ops, device->pd); + if (!device->map) { + SPDK_ERRLOG("Unable to allocate memory map for listen address\n"); + rc = -ENOMEM; + break; + } + + assert(device->map != NULL); + assert(device->pd != NULL); + } + rdma_free_devices(contexts); + + if (opts->io_unit_size * max_device_sge < opts->max_io_size) { + /* divide and round up. */ + opts->io_unit_size = (opts->max_io_size + max_device_sge - 1) / max_device_sge; + + /* round up to the nearest 4k. */ + opts->io_unit_size = (opts->io_unit_size + NVMF_DATA_BUFFER_ALIGNMENT - 1) & ~NVMF_DATA_BUFFER_MASK; + + opts->io_unit_size = spdk_max(opts->io_unit_size, SPDK_NVMF_RDMA_MIN_IO_BUFFER_SIZE); + SPDK_NOTICELOG("Adjusting the io unit size to fit the device's maximum I/O size. New I/O unit size %u\n", + opts->io_unit_size); + } + + if (rc < 0) { + nvmf_rdma_destroy(&rtransport->transport); + return NULL; + } + + /* Set up poll descriptor array to monitor events from RDMA and IB + * in a single poll syscall + */ + rtransport->npoll_fds = i + 1; + i = 0; + rtransport->poll_fds = calloc(rtransport->npoll_fds, sizeof(struct pollfd)); + if (rtransport->poll_fds == NULL) { + SPDK_ERRLOG("poll_fds allocation failed\n"); + nvmf_rdma_destroy(&rtransport->transport); + return NULL; + } + + rtransport->poll_fds[i].fd = rtransport->event_channel->fd; + rtransport->poll_fds[i++].events = POLLIN; + + TAILQ_FOREACH_SAFE(device, &rtransport->devices, link, tmp) { + rtransport->poll_fds[i].fd = device->context->async_fd; + rtransport->poll_fds[i++].events = POLLIN; + } + + return &rtransport->transport; +} + +static int +nvmf_rdma_destroy(struct spdk_nvmf_transport *transport) +{ + struct spdk_nvmf_rdma_transport *rtransport; + struct spdk_nvmf_rdma_port *port, *port_tmp; + struct spdk_nvmf_rdma_device *device, *device_tmp; + + rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport); + + TAILQ_FOREACH_SAFE(port, &rtransport->ports, link, port_tmp) { + TAILQ_REMOVE(&rtransport->ports, port, link); + rdma_destroy_id(port->id); + free(port); + } + + if (rtransport->poll_fds != NULL) { + free(rtransport->poll_fds); + } + + if (rtransport->event_channel != NULL) { + rdma_destroy_event_channel(rtransport->event_channel); + } + + TAILQ_FOREACH_SAFE(device, &rtransport->devices, link, device_tmp) { + TAILQ_REMOVE(&rtransport->devices, device, link); + if (device->map) { + spdk_mem_map_free(&device->map); + } + if (device->pd) { + if (!g_nvmf_hooks.get_ibv_pd) { + ibv_dealloc_pd(device->pd); + } + } + free(device); + } + + if (rtransport->data_wr_pool != NULL) { + if (spdk_mempool_count(rtransport->data_wr_pool) != + (transport->opts.max_queue_depth * SPDK_NVMF_MAX_SGL_ENTRIES)) { + SPDK_ERRLOG("transport wr pool count is %zu but should be %u\n", + spdk_mempool_count(rtransport->data_wr_pool), + transport->opts.max_queue_depth * SPDK_NVMF_MAX_SGL_ENTRIES); + } + } + + spdk_mempool_free(rtransport->data_wr_pool); + + pthread_mutex_destroy(&rtransport->lock); + free(rtransport); + + return 0; +} + +static int +nvmf_rdma_trid_from_cm_id(struct rdma_cm_id *id, + struct spdk_nvme_transport_id *trid, + bool peer); + +static int +nvmf_rdma_listen(struct spdk_nvmf_transport *transport, + const struct spdk_nvme_transport_id *trid) +{ + struct spdk_nvmf_rdma_transport *rtransport; + struct spdk_nvmf_rdma_device *device; + struct spdk_nvmf_rdma_port *port; + struct addrinfo *res; + struct addrinfo hints; + int family; + int rc; + + rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport); + assert(rtransport->event_channel != NULL); + + pthread_mutex_lock(&rtransport->lock); + port = calloc(1, sizeof(*port)); + if (!port) { + SPDK_ERRLOG("Port allocation failed\n"); + pthread_mutex_unlock(&rtransport->lock); + return -ENOMEM; + } + + port->trid = trid; + + switch (trid->adrfam) { + case SPDK_NVMF_ADRFAM_IPV4: + family = AF_INET; + break; + case SPDK_NVMF_ADRFAM_IPV6: + family = AF_INET6; + break; + default: + SPDK_ERRLOG("Unhandled ADRFAM %d\n", trid->adrfam); + free(port); + pthread_mutex_unlock(&rtransport->lock); + return -EINVAL; + } + + memset(&hints, 0, sizeof(hints)); + hints.ai_family = family; + hints.ai_flags = AI_NUMERICSERV; + hints.ai_socktype = SOCK_STREAM; + hints.ai_protocol = 0; + + rc = getaddrinfo(trid->traddr, trid->trsvcid, &hints, &res); + if (rc) { + SPDK_ERRLOG("getaddrinfo failed: %s (%d)\n", gai_strerror(rc), rc); + free(port); + pthread_mutex_unlock(&rtransport->lock); + return -EINVAL; + } + + rc = rdma_create_id(rtransport->event_channel, &port->id, port, RDMA_PS_TCP); + if (rc < 0) { + SPDK_ERRLOG("rdma_create_id() failed\n"); + freeaddrinfo(res); + free(port); + pthread_mutex_unlock(&rtransport->lock); + return rc; + } + + rc = rdma_bind_addr(port->id, res->ai_addr); + freeaddrinfo(res); + + if (rc < 0) { + SPDK_ERRLOG("rdma_bind_addr() failed\n"); + rdma_destroy_id(port->id); + free(port); + pthread_mutex_unlock(&rtransport->lock); + return rc; + } + + if (!port->id->verbs) { + SPDK_ERRLOG("ibv_context is null\n"); + rdma_destroy_id(port->id); + free(port); + pthread_mutex_unlock(&rtransport->lock); + return -1; + } + + rc = rdma_listen(port->id, transport->opts.acceptor_backlog); + if (rc < 0) { + SPDK_ERRLOG("rdma_listen() failed\n"); + rdma_destroy_id(port->id); + free(port); + pthread_mutex_unlock(&rtransport->lock); + return rc; + } + + TAILQ_FOREACH(device, &rtransport->devices, link) { + if (device->context == port->id->verbs) { + port->device = device; + break; + } + } + if (!port->device) { + SPDK_ERRLOG("Accepted a connection with verbs %p, but unable to find a corresponding device.\n", + port->id->verbs); + rdma_destroy_id(port->id); + free(port); + pthread_mutex_unlock(&rtransport->lock); + return -EINVAL; + } + + SPDK_NOTICELOG("*** NVMe/RDMA Target Listening on %s port %s ***\n", + trid->traddr, trid->trsvcid); + + TAILQ_INSERT_TAIL(&rtransport->ports, port, link); + pthread_mutex_unlock(&rtransport->lock); + return 0; +} + +static void +nvmf_rdma_stop_listen(struct spdk_nvmf_transport *transport, + const struct spdk_nvme_transport_id *trid) +{ + struct spdk_nvmf_rdma_transport *rtransport; + struct spdk_nvmf_rdma_port *port, *tmp; + + rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport); + + pthread_mutex_lock(&rtransport->lock); + TAILQ_FOREACH_SAFE(port, &rtransport->ports, link, tmp) { + if (spdk_nvme_transport_id_compare(port->trid, trid) == 0) { + TAILQ_REMOVE(&rtransport->ports, port, link); + rdma_destroy_id(port->id); + free(port); + break; + } + } + + pthread_mutex_unlock(&rtransport->lock); +} + +static void +nvmf_rdma_qpair_process_pending(struct spdk_nvmf_rdma_transport *rtransport, + struct spdk_nvmf_rdma_qpair *rqpair, bool drain) +{ + struct spdk_nvmf_request *req, *tmp; + struct spdk_nvmf_rdma_request *rdma_req, *req_tmp; + struct spdk_nvmf_rdma_resources *resources; + + /* We process I/O in the data transfer pending queue at the highest priority. RDMA reads first */ + STAILQ_FOREACH_SAFE(rdma_req, &rqpair->pending_rdma_read_queue, state_link, req_tmp) { + if (nvmf_rdma_request_process(rtransport, rdma_req) == false && drain == false) { + break; + } + } + + /* Then RDMA writes since reads have stronger restrictions than writes */ + STAILQ_FOREACH_SAFE(rdma_req, &rqpair->pending_rdma_write_queue, state_link, req_tmp) { + if (nvmf_rdma_request_process(rtransport, rdma_req) == false && drain == false) { + break; + } + } + + /* The second highest priority is I/O waiting on memory buffers. */ + STAILQ_FOREACH_SAFE(req, &rqpair->poller->group->group.pending_buf_queue, buf_link, tmp) { + rdma_req = SPDK_CONTAINEROF(req, struct spdk_nvmf_rdma_request, req); + if (nvmf_rdma_request_process(rtransport, rdma_req) == false && drain == false) { + break; + } + } + + resources = rqpair->resources; + while (!STAILQ_EMPTY(&resources->free_queue) && !STAILQ_EMPTY(&resources->incoming_queue)) { + rdma_req = STAILQ_FIRST(&resources->free_queue); + STAILQ_REMOVE_HEAD(&resources->free_queue, state_link); + rdma_req->recv = STAILQ_FIRST(&resources->incoming_queue); + STAILQ_REMOVE_HEAD(&resources->incoming_queue, link); + + if (rqpair->srq != NULL) { + rdma_req->req.qpair = &rdma_req->recv->qpair->qpair; + rdma_req->recv->qpair->qd++; + } else { + rqpair->qd++; + } + + rdma_req->receive_tsc = rdma_req->recv->receive_tsc; + rdma_req->state = RDMA_REQUEST_STATE_NEW; + if (nvmf_rdma_request_process(rtransport, rdma_req) == false) { + break; + } + } + if (!STAILQ_EMPTY(&resources->incoming_queue) && STAILQ_EMPTY(&resources->free_queue)) { + rqpair->poller->stat.pending_free_request++; + } +} + +static void +_nvmf_rdma_qpair_disconnect(void *ctx) +{ + struct spdk_nvmf_qpair *qpair = ctx; + + spdk_nvmf_qpair_disconnect(qpair, NULL, NULL); +} + +static void +_nvmf_rdma_try_disconnect(void *ctx) +{ + struct spdk_nvmf_qpair *qpair = ctx; + struct spdk_nvmf_poll_group *group; + + /* Read the group out of the qpair. This is normally set and accessed only from + * the thread that created the group. Here, we're not on that thread necessarily. + * The data member qpair->group begins it's life as NULL and then is assigned to + * a pointer and never changes. So fortunately reading this and checking for + * non-NULL is thread safe in the x86_64 memory model. */ + group = qpair->group; + + if (group == NULL) { + /* The qpair hasn't been assigned to a group yet, so we can't + * process a disconnect. Send a message to ourself and try again. */ + spdk_thread_send_msg(spdk_get_thread(), _nvmf_rdma_try_disconnect, qpair); + return; + } + + spdk_thread_send_msg(group->thread, _nvmf_rdma_qpair_disconnect, qpair); +} + +static inline void +nvmf_rdma_start_disconnect(struct spdk_nvmf_rdma_qpair *rqpair) +{ + if (!__atomic_test_and_set(&rqpair->disconnect_started, __ATOMIC_RELAXED)) { + _nvmf_rdma_try_disconnect(&rqpair->qpair); + } +} + +static void nvmf_rdma_destroy_drained_qpair(void *ctx) +{ + struct spdk_nvmf_rdma_qpair *rqpair = ctx; + struct spdk_nvmf_rdma_transport *rtransport = SPDK_CONTAINEROF(rqpair->qpair.transport, + struct spdk_nvmf_rdma_transport, transport); + + /* In non SRQ path, we will reach rqpair->max_queue_depth. In SRQ path, we will get the last_wqe event. */ + if (rqpair->current_send_depth != 0) { + return; + } + + if (rqpair->srq == NULL && rqpair->current_recv_depth != rqpair->max_queue_depth) { + return; + } + + if (rqpair->srq != NULL && rqpair->last_wqe_reached == false) { + return; + } + + nvmf_rdma_qpair_process_pending(rtransport, rqpair, true); + + /* Qpair will be destroyed after nvmf layer closes this qpair */ + if (rqpair->qpair.state != SPDK_NVMF_QPAIR_ERROR) { + return; + } + + nvmf_rdma_qpair_destroy(rqpair); +} + + +static int +nvmf_rdma_disconnect(struct rdma_cm_event *evt) +{ + struct spdk_nvmf_qpair *qpair; + struct spdk_nvmf_rdma_qpair *rqpair; + + if (evt->id == NULL) { + SPDK_ERRLOG("disconnect request: missing cm_id\n"); + return -1; + } + + qpair = evt->id->context; + if (qpair == NULL) { + SPDK_ERRLOG("disconnect request: no active connection\n"); + return -1; + } + + rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair); + + spdk_trace_record(TRACE_RDMA_QP_DISCONNECT, 0, 0, (uintptr_t)rqpair->cm_id, 0); + + nvmf_rdma_start_disconnect(rqpair); + + return 0; +} + +#ifdef DEBUG +static const char *CM_EVENT_STR[] = { + "RDMA_CM_EVENT_ADDR_RESOLVED", + "RDMA_CM_EVENT_ADDR_ERROR", + "RDMA_CM_EVENT_ROUTE_RESOLVED", + "RDMA_CM_EVENT_ROUTE_ERROR", + "RDMA_CM_EVENT_CONNECT_REQUEST", + "RDMA_CM_EVENT_CONNECT_RESPONSE", + "RDMA_CM_EVENT_CONNECT_ERROR", + "RDMA_CM_EVENT_UNREACHABLE", + "RDMA_CM_EVENT_REJECTED", + "RDMA_CM_EVENT_ESTABLISHED", + "RDMA_CM_EVENT_DISCONNECTED", + "RDMA_CM_EVENT_DEVICE_REMOVAL", + "RDMA_CM_EVENT_MULTICAST_JOIN", + "RDMA_CM_EVENT_MULTICAST_ERROR", + "RDMA_CM_EVENT_ADDR_CHANGE", + "RDMA_CM_EVENT_TIMEWAIT_EXIT" +}; +#endif /* DEBUG */ + +static void +nvmf_rdma_disconnect_qpairs_on_port(struct spdk_nvmf_rdma_transport *rtransport, + struct spdk_nvmf_rdma_port *port) +{ + struct spdk_nvmf_rdma_poll_group *rgroup; + struct spdk_nvmf_rdma_poller *rpoller; + struct spdk_nvmf_rdma_qpair *rqpair; + + TAILQ_FOREACH(rgroup, &rtransport->poll_groups, link) { + TAILQ_FOREACH(rpoller, &rgroup->pollers, link) { + TAILQ_FOREACH(rqpair, &rpoller->qpairs, link) { + if (rqpair->listen_id == port->id) { + nvmf_rdma_start_disconnect(rqpair); + } + } + } + } +} + +static bool +nvmf_rdma_handle_cm_event_addr_change(struct spdk_nvmf_transport *transport, + struct rdma_cm_event *event) +{ + const struct spdk_nvme_transport_id *trid; + struct spdk_nvmf_rdma_port *port; + struct spdk_nvmf_rdma_transport *rtransport; + bool event_acked = false; + + rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport); + TAILQ_FOREACH(port, &rtransport->ports, link) { + if (port->id == event->id) { + SPDK_ERRLOG("ADDR_CHANGE: IP %s:%s migrated\n", port->trid->traddr, port->trid->trsvcid); + rdma_ack_cm_event(event); + event_acked = true; + trid = port->trid; + break; + } + } + + if (event_acked) { + nvmf_rdma_disconnect_qpairs_on_port(rtransport, port); + + nvmf_rdma_stop_listen(transport, trid); + nvmf_rdma_listen(transport, trid); + } + + return event_acked; +} + +static void +nvmf_rdma_handle_cm_event_port_removal(struct spdk_nvmf_transport *transport, + struct rdma_cm_event *event) +{ + struct spdk_nvmf_rdma_port *port; + struct spdk_nvmf_rdma_transport *rtransport; + + port = event->id->context; + rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport); + + SPDK_NOTICELOG("Port %s:%s is being removed\n", port->trid->traddr, port->trid->trsvcid); + + nvmf_rdma_disconnect_qpairs_on_port(rtransport, port); + + rdma_ack_cm_event(event); + + while (spdk_nvmf_transport_stop_listen(transport, port->trid) == 0) { + ; + } +} + +static void +nvmf_process_cm_event(struct spdk_nvmf_transport *transport) +{ + struct spdk_nvmf_rdma_transport *rtransport; + struct rdma_cm_event *event; + int rc; + bool event_acked; + + rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport); + + if (rtransport->event_channel == NULL) { + return; + } + + while (1) { + event_acked = false; + rc = rdma_get_cm_event(rtransport->event_channel, &event); + if (rc) { + if (errno != EAGAIN && errno != EWOULDBLOCK) { + SPDK_ERRLOG("Acceptor Event Error: %s\n", spdk_strerror(errno)); + } + break; + } + + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Acceptor Event: %s\n", CM_EVENT_STR[event->event]); + + spdk_trace_record(TRACE_RDMA_CM_ASYNC_EVENT, 0, 0, 0, event->event); + + switch (event->event) { + case RDMA_CM_EVENT_ADDR_RESOLVED: + case RDMA_CM_EVENT_ADDR_ERROR: + case RDMA_CM_EVENT_ROUTE_RESOLVED: + case RDMA_CM_EVENT_ROUTE_ERROR: + /* No action required. The target never attempts to resolve routes. */ + break; + case RDMA_CM_EVENT_CONNECT_REQUEST: + rc = nvmf_rdma_connect(transport, event); + if (rc < 0) { + SPDK_ERRLOG("Unable to process connect event. rc: %d\n", rc); + break; + } + break; + case RDMA_CM_EVENT_CONNECT_RESPONSE: + /* The target never initiates a new connection. So this will not occur. */ + break; + case RDMA_CM_EVENT_CONNECT_ERROR: + /* Can this happen? The docs say it can, but not sure what causes it. */ + break; + case RDMA_CM_EVENT_UNREACHABLE: + case RDMA_CM_EVENT_REJECTED: + /* These only occur on the client side. */ + break; + case RDMA_CM_EVENT_ESTABLISHED: + /* TODO: Should we be waiting for this event anywhere? */ + break; + case RDMA_CM_EVENT_DISCONNECTED: + rc = nvmf_rdma_disconnect(event); + if (rc < 0) { + SPDK_ERRLOG("Unable to process disconnect event. rc: %d\n", rc); + break; + } + break; + case RDMA_CM_EVENT_DEVICE_REMOVAL: + /* In case of device removal, kernel IB part triggers IBV_EVENT_DEVICE_FATAL + * which triggers RDMA_CM_EVENT_DEVICE_REMOVAL on all cma_id’s. + * Once these events are sent to SPDK, we should release all IB resources and + * don't make attempts to call any ibv_query/modify/create functions. We can only call + * ibv_destory* functions to release user space memory allocated by IB. All kernel + * resources are already cleaned. */ + if (event->id->qp) { + /* If rdma_cm event has a valid `qp` pointer then the event refers to the + * corresponding qpair. Otherwise the event refers to a listening device */ + rc = nvmf_rdma_disconnect(event); + if (rc < 0) { + SPDK_ERRLOG("Unable to process disconnect event. rc: %d\n", rc); + break; + } + } else { + nvmf_rdma_handle_cm_event_port_removal(transport, event); + event_acked = true; + } + break; + case RDMA_CM_EVENT_MULTICAST_JOIN: + case RDMA_CM_EVENT_MULTICAST_ERROR: + /* Multicast is not used */ + break; + case RDMA_CM_EVENT_ADDR_CHANGE: + event_acked = nvmf_rdma_handle_cm_event_addr_change(transport, event); + break; + case RDMA_CM_EVENT_TIMEWAIT_EXIT: + /* For now, do nothing. The target never re-uses queue pairs. */ + break; + default: + SPDK_ERRLOG("Unexpected Acceptor Event [%d]\n", event->event); + break; + } + if (!event_acked) { + rdma_ack_cm_event(event); + } + } +} + +static void +nvmf_rdma_handle_qp_fatal(struct spdk_nvmf_rdma_qpair *rqpair) +{ + nvmf_rdma_update_ibv_state(rqpair); + nvmf_rdma_start_disconnect(rqpair); +} + +static void +nvmf_rdma_handle_last_wqe_reached(struct spdk_nvmf_rdma_qpair *rqpair) +{ + rqpair->last_wqe_reached = true; + nvmf_rdma_destroy_drained_qpair(rqpair); +} + +static void +nvmf_rdma_handle_sq_drained(struct spdk_nvmf_rdma_qpair *rqpair) +{ + nvmf_rdma_start_disconnect(rqpair); +} + +static void +nvmf_rdma_qpair_process_ibv_event(void *ctx) +{ + struct spdk_nvmf_rdma_ibv_event_ctx *event_ctx = ctx; + + if (event_ctx->rqpair) { + STAILQ_REMOVE(&event_ctx->rqpair->ibv_events, event_ctx, spdk_nvmf_rdma_ibv_event_ctx, link); + if (event_ctx->cb_fn) { + event_ctx->cb_fn(event_ctx->rqpair); + } + } + free(event_ctx); +} + +static int +nvmf_rdma_send_qpair_async_event(struct spdk_nvmf_rdma_qpair *rqpair, + spdk_nvmf_rdma_qpair_ibv_event fn) +{ + struct spdk_nvmf_rdma_ibv_event_ctx *ctx; + struct spdk_thread *thr = NULL; + int rc; + + if (rqpair->qpair.group) { + thr = rqpair->qpair.group->thread; + } else if (rqpair->destruct_channel) { + thr = spdk_io_channel_get_thread(rqpair->destruct_channel); + } + + if (!thr) { + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "rqpair %p has no thread\n", rqpair); + return -EINVAL; + } + + ctx = calloc(1, sizeof(*ctx)); + if (!ctx) { + return -ENOMEM; + } + + ctx->rqpair = rqpair; + ctx->cb_fn = fn; + STAILQ_INSERT_TAIL(&rqpair->ibv_events, ctx, link); + + rc = spdk_thread_send_msg(thr, nvmf_rdma_qpair_process_ibv_event, ctx); + if (rc) { + STAILQ_REMOVE(&rqpair->ibv_events, ctx, spdk_nvmf_rdma_ibv_event_ctx, link); + free(ctx); + } + + return rc; +} + +static void +nvmf_process_ib_event(struct spdk_nvmf_rdma_device *device) +{ + int rc; + struct spdk_nvmf_rdma_qpair *rqpair = NULL; + struct ibv_async_event event; + + rc = ibv_get_async_event(device->context, &event); + + if (rc) { + SPDK_ERRLOG("Failed to get async_event (%d): %s\n", + errno, spdk_strerror(errno)); + return; + } + + switch (event.event_type) { + case IBV_EVENT_QP_FATAL: + rqpair = event.element.qp->qp_context; + SPDK_ERRLOG("Fatal event received for rqpair %p\n", rqpair); + spdk_trace_record(TRACE_RDMA_IBV_ASYNC_EVENT, 0, 0, + (uintptr_t)rqpair->cm_id, event.event_type); + rc = nvmf_rdma_send_qpair_async_event(rqpair, nvmf_rdma_handle_qp_fatal); + if (rc) { + SPDK_WARNLOG("Failed to send QP_FATAL event. rqpair %p, err %d\n", rqpair, rc); + nvmf_rdma_handle_qp_fatal(rqpair); + } + break; + case IBV_EVENT_QP_LAST_WQE_REACHED: + /* This event only occurs for shared receive queues. */ + rqpair = event.element.qp->qp_context; + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Last WQE reached event received for rqpair %p\n", rqpair); + rc = nvmf_rdma_send_qpair_async_event(rqpair, nvmf_rdma_handle_last_wqe_reached); + if (rc) { + SPDK_WARNLOG("Failed to send LAST_WQE_REACHED event. rqpair %p, err %d\n", rqpair, rc); + rqpair->last_wqe_reached = true; + } + break; + case IBV_EVENT_SQ_DRAINED: + /* This event occurs frequently in both error and non-error states. + * Check if the qpair is in an error state before sending a message. */ + rqpair = event.element.qp->qp_context; + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Last sq drained event received for rqpair %p\n", rqpair); + spdk_trace_record(TRACE_RDMA_IBV_ASYNC_EVENT, 0, 0, + (uintptr_t)rqpair->cm_id, event.event_type); + if (nvmf_rdma_update_ibv_state(rqpair) == IBV_QPS_ERR) { + rc = nvmf_rdma_send_qpair_async_event(rqpair, nvmf_rdma_handle_sq_drained); + if (rc) { + SPDK_WARNLOG("Failed to send SQ_DRAINED event. rqpair %p, err %d\n", rqpair, rc); + nvmf_rdma_handle_sq_drained(rqpair); + } + } + break; + case IBV_EVENT_QP_REQ_ERR: + case IBV_EVENT_QP_ACCESS_ERR: + case IBV_EVENT_COMM_EST: + case IBV_EVENT_PATH_MIG: + case IBV_EVENT_PATH_MIG_ERR: + SPDK_NOTICELOG("Async event: %s\n", + ibv_event_type_str(event.event_type)); + rqpair = event.element.qp->qp_context; + spdk_trace_record(TRACE_RDMA_IBV_ASYNC_EVENT, 0, 0, + (uintptr_t)rqpair->cm_id, event.event_type); + nvmf_rdma_update_ibv_state(rqpair); + break; + case IBV_EVENT_CQ_ERR: + case IBV_EVENT_DEVICE_FATAL: + case IBV_EVENT_PORT_ACTIVE: + case IBV_EVENT_PORT_ERR: + case IBV_EVENT_LID_CHANGE: + case IBV_EVENT_PKEY_CHANGE: + case IBV_EVENT_SM_CHANGE: + case IBV_EVENT_SRQ_ERR: + case IBV_EVENT_SRQ_LIMIT_REACHED: + case IBV_EVENT_CLIENT_REREGISTER: + case IBV_EVENT_GID_CHANGE: + default: + SPDK_NOTICELOG("Async event: %s\n", + ibv_event_type_str(event.event_type)); + spdk_trace_record(TRACE_RDMA_IBV_ASYNC_EVENT, 0, 0, 0, event.event_type); + break; + } + ibv_ack_async_event(&event); +} + +static uint32_t +nvmf_rdma_accept(struct spdk_nvmf_transport *transport) +{ + int nfds, i = 0; + struct spdk_nvmf_rdma_transport *rtransport; + struct spdk_nvmf_rdma_device *device, *tmp; + uint32_t count; + + rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport); + count = nfds = poll(rtransport->poll_fds, rtransport->npoll_fds, 0); + + if (nfds <= 0) { + return 0; + } + + /* The first poll descriptor is RDMA CM event */ + if (rtransport->poll_fds[i++].revents & POLLIN) { + nvmf_process_cm_event(transport); + nfds--; + } + + if (nfds == 0) { + return count; + } + + /* Second and subsequent poll descriptors are IB async events */ + TAILQ_FOREACH_SAFE(device, &rtransport->devices, link, tmp) { + if (rtransport->poll_fds[i++].revents & POLLIN) { + nvmf_process_ib_event(device); + nfds--; + } + } + /* check all flagged fd's have been served */ + assert(nfds == 0); + + return count; +} + +static void +nvmf_rdma_cdata_init(struct spdk_nvmf_transport *transport, struct spdk_nvmf_subsystem *subsystem, + struct spdk_nvmf_ctrlr_data *cdata) +{ + cdata->nvmf_specific.msdbd = SPDK_NVMF_MAX_SGL_ENTRIES; + + /* Disable in-capsule data transfer for RDMA controller when dif_insert_or_strip is enabled + since in-capsule data only works with NVME drives that support SGL memory layout */ + if (transport->opts.dif_insert_or_strip) { + cdata->nvmf_specific.ioccsz = sizeof(struct spdk_nvme_cmd) / 16; + } +} + +static void +nvmf_rdma_discover(struct spdk_nvmf_transport *transport, + struct spdk_nvme_transport_id *trid, + struct spdk_nvmf_discovery_log_page_entry *entry) +{ + entry->trtype = SPDK_NVMF_TRTYPE_RDMA; + entry->adrfam = trid->adrfam; + entry->treq.secure_channel = SPDK_NVMF_TREQ_SECURE_CHANNEL_NOT_REQUIRED; + + spdk_strcpy_pad(entry->trsvcid, trid->trsvcid, sizeof(entry->trsvcid), ' '); + spdk_strcpy_pad(entry->traddr, trid->traddr, sizeof(entry->traddr), ' '); + + entry->tsas.rdma.rdma_qptype = SPDK_NVMF_RDMA_QPTYPE_RELIABLE_CONNECTED; + entry->tsas.rdma.rdma_prtype = SPDK_NVMF_RDMA_PRTYPE_NONE; + entry->tsas.rdma.rdma_cms = SPDK_NVMF_RDMA_CMS_RDMA_CM; +} + +static void +nvmf_rdma_poll_group_destroy(struct spdk_nvmf_transport_poll_group *group); + +static struct spdk_nvmf_transport_poll_group * +nvmf_rdma_poll_group_create(struct spdk_nvmf_transport *transport) +{ + struct spdk_nvmf_rdma_transport *rtransport; + struct spdk_nvmf_rdma_poll_group *rgroup; + struct spdk_nvmf_rdma_poller *poller; + struct spdk_nvmf_rdma_device *device; + struct ibv_srq_init_attr srq_init_attr; + struct spdk_nvmf_rdma_resource_opts opts; + int num_cqe; + + rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport); + + rgroup = calloc(1, sizeof(*rgroup)); + if (!rgroup) { + return NULL; + } + + TAILQ_INIT(&rgroup->pollers); + STAILQ_INIT(&rgroup->retired_bufs); + + pthread_mutex_lock(&rtransport->lock); + TAILQ_FOREACH(device, &rtransport->devices, link) { + poller = calloc(1, sizeof(*poller)); + if (!poller) { + SPDK_ERRLOG("Unable to allocate memory for new RDMA poller\n"); + nvmf_rdma_poll_group_destroy(&rgroup->group); + pthread_mutex_unlock(&rtransport->lock); + return NULL; + } + + poller->device = device; + poller->group = rgroup; + + TAILQ_INIT(&poller->qpairs); + STAILQ_INIT(&poller->qpairs_pending_send); + STAILQ_INIT(&poller->qpairs_pending_recv); + + TAILQ_INSERT_TAIL(&rgroup->pollers, poller, link); + if (transport->opts.no_srq == false && device->num_srq < device->attr.max_srq) { + poller->max_srq_depth = transport->opts.max_srq_depth; + + device->num_srq++; + memset(&srq_init_attr, 0, sizeof(struct ibv_srq_init_attr)); + srq_init_attr.attr.max_wr = poller->max_srq_depth; + srq_init_attr.attr.max_sge = spdk_min(device->attr.max_sge, NVMF_DEFAULT_RX_SGE); + poller->srq = ibv_create_srq(device->pd, &srq_init_attr); + if (!poller->srq) { + SPDK_ERRLOG("Unable to create shared receive queue, errno %d\n", errno); + nvmf_rdma_poll_group_destroy(&rgroup->group); + pthread_mutex_unlock(&rtransport->lock); + return NULL; + } + + opts.qp = poller->srq; + opts.pd = device->pd; + opts.qpair = NULL; + opts.shared = true; + opts.max_queue_depth = poller->max_srq_depth; + opts.in_capsule_data_size = transport->opts.in_capsule_data_size; + + poller->resources = nvmf_rdma_resources_create(&opts); + if (!poller->resources) { + SPDK_ERRLOG("Unable to allocate resources for shared receive queue.\n"); + nvmf_rdma_poll_group_destroy(&rgroup->group); + pthread_mutex_unlock(&rtransport->lock); + return NULL; + } + } + + /* + * When using an srq, we can limit the completion queue at startup. + * The following formula represents the calculation: + * num_cqe = num_recv + num_data_wr + num_send_wr. + * where num_recv=num_data_wr=and num_send_wr=poller->max_srq_depth + */ + if (poller->srq) { + num_cqe = poller->max_srq_depth * 3; + } else { + num_cqe = DEFAULT_NVMF_RDMA_CQ_SIZE; + } + + poller->cq = ibv_create_cq(device->context, num_cqe, poller, NULL, 0); + if (!poller->cq) { + SPDK_ERRLOG("Unable to create completion queue\n"); + nvmf_rdma_poll_group_destroy(&rgroup->group); + pthread_mutex_unlock(&rtransport->lock); + return NULL; + } + poller->num_cqe = num_cqe; + } + + TAILQ_INSERT_TAIL(&rtransport->poll_groups, rgroup, link); + if (rtransport->conn_sched.next_admin_pg == NULL) { + rtransport->conn_sched.next_admin_pg = rgroup; + rtransport->conn_sched.next_io_pg = rgroup; + } + + pthread_mutex_unlock(&rtransport->lock); + return &rgroup->group; +} + +static struct spdk_nvmf_transport_poll_group * +nvmf_rdma_get_optimal_poll_group(struct spdk_nvmf_qpair *qpair) +{ + struct spdk_nvmf_rdma_transport *rtransport; + struct spdk_nvmf_rdma_poll_group **pg; + struct spdk_nvmf_transport_poll_group *result; + + rtransport = SPDK_CONTAINEROF(qpair->transport, struct spdk_nvmf_rdma_transport, transport); + + pthread_mutex_lock(&rtransport->lock); + + if (TAILQ_EMPTY(&rtransport->poll_groups)) { + pthread_mutex_unlock(&rtransport->lock); + return NULL; + } + + if (qpair->qid == 0) { + pg = &rtransport->conn_sched.next_admin_pg; + } else { + pg = &rtransport->conn_sched.next_io_pg; + } + + assert(*pg != NULL); + + result = &(*pg)->group; + + *pg = TAILQ_NEXT(*pg, link); + if (*pg == NULL) { + *pg = TAILQ_FIRST(&rtransport->poll_groups); + } + + pthread_mutex_unlock(&rtransport->lock); + + return result; +} + +static void +nvmf_rdma_poll_group_destroy(struct spdk_nvmf_transport_poll_group *group) +{ + struct spdk_nvmf_rdma_poll_group *rgroup, *next_rgroup; + struct spdk_nvmf_rdma_poller *poller, *tmp; + struct spdk_nvmf_rdma_qpair *qpair, *tmp_qpair; + struct spdk_nvmf_transport_pg_cache_buf *buf, *tmp_buf; + struct spdk_nvmf_rdma_transport *rtransport; + + rgroup = SPDK_CONTAINEROF(group, struct spdk_nvmf_rdma_poll_group, group); + if (!rgroup) { + return; + } + + /* free all retired buffers back to the transport so we don't short the mempool. */ + STAILQ_FOREACH_SAFE(buf, &rgroup->retired_bufs, link, tmp_buf) { + STAILQ_REMOVE(&rgroup->retired_bufs, buf, spdk_nvmf_transport_pg_cache_buf, link); + assert(group->transport != NULL); + spdk_mempool_put(group->transport->data_buf_pool, buf); + } + + TAILQ_FOREACH_SAFE(poller, &rgroup->pollers, link, tmp) { + TAILQ_REMOVE(&rgroup->pollers, poller, link); + + TAILQ_FOREACH_SAFE(qpair, &poller->qpairs, link, tmp_qpair) { + nvmf_rdma_qpair_destroy(qpair); + } + + if (poller->srq) { + if (poller->resources) { + nvmf_rdma_resources_destroy(poller->resources); + } + ibv_destroy_srq(poller->srq); + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Destroyed RDMA shared queue %p\n", poller->srq); + } + + if (poller->cq) { + ibv_destroy_cq(poller->cq); + } + + free(poller); + } + + if (rgroup->group.transport == NULL) { + /* Transport can be NULL when nvmf_rdma_poll_group_create() + * calls this function directly in a failure path. */ + free(rgroup); + return; + } + + rtransport = SPDK_CONTAINEROF(rgroup->group.transport, struct spdk_nvmf_rdma_transport, transport); + + pthread_mutex_lock(&rtransport->lock); + next_rgroup = TAILQ_NEXT(rgroup, link); + TAILQ_REMOVE(&rtransport->poll_groups, rgroup, link); + if (next_rgroup == NULL) { + next_rgroup = TAILQ_FIRST(&rtransport->poll_groups); + } + if (rtransport->conn_sched.next_admin_pg == rgroup) { + rtransport->conn_sched.next_admin_pg = next_rgroup; + } + if (rtransport->conn_sched.next_io_pg == rgroup) { + rtransport->conn_sched.next_io_pg = next_rgroup; + } + pthread_mutex_unlock(&rtransport->lock); + + free(rgroup); +} + +static void +nvmf_rdma_qpair_reject_connection(struct spdk_nvmf_rdma_qpair *rqpair) +{ + if (rqpair->cm_id != NULL) { + nvmf_rdma_event_reject(rqpair->cm_id, SPDK_NVMF_RDMA_ERROR_NO_RESOURCES); + } + nvmf_rdma_qpair_destroy(rqpair); +} + +static int +nvmf_rdma_poll_group_add(struct spdk_nvmf_transport_poll_group *group, + struct spdk_nvmf_qpair *qpair) +{ + struct spdk_nvmf_rdma_poll_group *rgroup; + struct spdk_nvmf_rdma_qpair *rqpair; + struct spdk_nvmf_rdma_device *device; + struct spdk_nvmf_rdma_poller *poller; + int rc; + + rgroup = SPDK_CONTAINEROF(group, struct spdk_nvmf_rdma_poll_group, group); + rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair); + + device = rqpair->device; + + TAILQ_FOREACH(poller, &rgroup->pollers, link) { + if (poller->device == device) { + break; + } + } + + if (!poller) { + SPDK_ERRLOG("No poller found for device.\n"); + return -1; + } + + TAILQ_INSERT_TAIL(&poller->qpairs, rqpair, link); + rqpair->poller = poller; + rqpair->srq = rqpair->poller->srq; + + rc = nvmf_rdma_qpair_initialize(qpair); + if (rc < 0) { + SPDK_ERRLOG("Failed to initialize nvmf_rdma_qpair with qpair=%p\n", qpair); + return -1; + } + + rc = nvmf_rdma_event_accept(rqpair->cm_id, rqpair); + if (rc) { + /* Try to reject, but we probably can't */ + nvmf_rdma_qpair_reject_connection(rqpair); + return -1; + } + + nvmf_rdma_update_ibv_state(rqpair); + + return 0; +} + +static int +nvmf_rdma_poll_group_remove(struct spdk_nvmf_transport_poll_group *group, + struct spdk_nvmf_qpair *qpair) +{ + struct spdk_nvmf_rdma_qpair *rqpair; + + rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair); + assert(group->transport->tgt != NULL); + + rqpair->destruct_channel = spdk_get_io_channel(group->transport->tgt); + + if (!rqpair->destruct_channel) { + SPDK_WARNLOG("failed to get io_channel, qpair %p\n", qpair); + return 0; + } + + /* Sanity check that we get io_channel on the correct thread */ + if (qpair->group) { + assert(qpair->group->thread == spdk_io_channel_get_thread(rqpair->destruct_channel)); + } + + return 0; +} + +static int +nvmf_rdma_request_free(struct spdk_nvmf_request *req) +{ + struct spdk_nvmf_rdma_request *rdma_req = SPDK_CONTAINEROF(req, struct spdk_nvmf_rdma_request, req); + struct spdk_nvmf_rdma_transport *rtransport = SPDK_CONTAINEROF(req->qpair->transport, + struct spdk_nvmf_rdma_transport, transport); + struct spdk_nvmf_rdma_qpair *rqpair = SPDK_CONTAINEROF(rdma_req->req.qpair, + struct spdk_nvmf_rdma_qpair, qpair); + + /* + * AER requests are freed when a qpair is destroyed. The recv corresponding to that request + * needs to be returned to the shared receive queue or the poll group will eventually be + * starved of RECV structures. + */ + if (rqpair->srq && rdma_req->recv) { + int rc; + struct ibv_recv_wr *bad_recv_wr; + + rc = ibv_post_srq_recv(rqpair->srq, &rdma_req->recv->wr, &bad_recv_wr); + if (rc) { + SPDK_ERRLOG("Unable to re-post rx descriptor\n"); + } + } + + _nvmf_rdma_request_free(rdma_req, rtransport); + return 0; +} + +static int +nvmf_rdma_request_complete(struct spdk_nvmf_request *req) +{ + struct spdk_nvmf_rdma_transport *rtransport = SPDK_CONTAINEROF(req->qpair->transport, + struct spdk_nvmf_rdma_transport, transport); + struct spdk_nvmf_rdma_request *rdma_req = SPDK_CONTAINEROF(req, + struct spdk_nvmf_rdma_request, req); + struct spdk_nvmf_rdma_qpair *rqpair = SPDK_CONTAINEROF(rdma_req->req.qpair, + struct spdk_nvmf_rdma_qpair, qpair); + + if (rqpair->ibv_state != IBV_QPS_ERR) { + /* The connection is alive, so process the request as normal */ + rdma_req->state = RDMA_REQUEST_STATE_EXECUTED; + } else { + /* The connection is dead. Move the request directly to the completed state. */ + rdma_req->state = RDMA_REQUEST_STATE_COMPLETED; + } + + nvmf_rdma_request_process(rtransport, rdma_req); + + return 0; +} + +static int +nvmf_rdma_destroy_defunct_qpair(void *ctx) +{ + struct spdk_nvmf_rdma_qpair *rqpair = ctx; + struct spdk_nvmf_rdma_transport *rtransport = SPDK_CONTAINEROF(rqpair->qpair.transport, + struct spdk_nvmf_rdma_transport, transport); + + SPDK_INFOLOG(SPDK_LOG_RDMA, "QP#%d hasn't been drained as expected, manually destroy it\n", + rqpair->qpair.qid); + + nvmf_rdma_qpair_process_pending(rtransport, rqpair, true); + nvmf_rdma_qpair_destroy(rqpair); + + return SPDK_POLLER_BUSY; +} + +static void +nvmf_rdma_close_qpair(struct spdk_nvmf_qpair *qpair) +{ + struct spdk_nvmf_rdma_qpair *rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair); + + if (rqpair->disconnect_flags & RDMA_QP_DISCONNECTING) { + return; + } + + rqpair->disconnect_flags |= RDMA_QP_DISCONNECTING; + + /* This happens only when the qpair is disconnected before + * it is added to the poll group. Since there is no poll group, + * the RDMA qp has not been initialized yet and the RDMA CM + * event has not yet been acknowledged, so we need to reject it. + */ + if (rqpair->qpair.state == SPDK_NVMF_QPAIR_UNINITIALIZED) { + nvmf_rdma_qpair_reject_connection(rqpair); + return; + } + + if (rqpair->rdma_qp) { + spdk_rdma_qp_disconnect(rqpair->rdma_qp); + } + + rqpair->destruct_poller = SPDK_POLLER_REGISTER(nvmf_rdma_destroy_defunct_qpair, (void *)rqpair, + NVMF_RDMA_QPAIR_DESTROY_TIMEOUT_US); +} + +static struct spdk_nvmf_rdma_qpair * +get_rdma_qpair_from_wc(struct spdk_nvmf_rdma_poller *rpoller, struct ibv_wc *wc) +{ + struct spdk_nvmf_rdma_qpair *rqpair; + /* @todo: improve QP search */ + TAILQ_FOREACH(rqpair, &rpoller->qpairs, link) { + if (wc->qp_num == rqpair->rdma_qp->qp->qp_num) { + return rqpair; + } + } + SPDK_ERRLOG("Didn't find QP with qp_num %u\n", wc->qp_num); + return NULL; +} + +#ifdef DEBUG +static int +nvmf_rdma_req_is_completing(struct spdk_nvmf_rdma_request *rdma_req) +{ + return rdma_req->state == RDMA_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST || + rdma_req->state == RDMA_REQUEST_STATE_COMPLETING; +} +#endif + +static void +_poller_reset_failed_recvs(struct spdk_nvmf_rdma_poller *rpoller, struct ibv_recv_wr *bad_recv_wr, + int rc) +{ + struct spdk_nvmf_rdma_recv *rdma_recv; + struct spdk_nvmf_rdma_wr *bad_rdma_wr; + + SPDK_ERRLOG("Failed to post a recv for the poller %p with errno %d\n", rpoller, -rc); + while (bad_recv_wr != NULL) { + bad_rdma_wr = (struct spdk_nvmf_rdma_wr *)bad_recv_wr->wr_id; + rdma_recv = SPDK_CONTAINEROF(bad_rdma_wr, struct spdk_nvmf_rdma_recv, rdma_wr); + + rdma_recv->qpair->current_recv_depth++; + bad_recv_wr = bad_recv_wr->next; + SPDK_ERRLOG("Failed to post a recv for the qpair %p with errno %d\n", rdma_recv->qpair, -rc); + nvmf_rdma_start_disconnect(rdma_recv->qpair); + } +} + +static void +_qp_reset_failed_recvs(struct spdk_nvmf_rdma_qpair *rqpair, struct ibv_recv_wr *bad_recv_wr, int rc) +{ + SPDK_ERRLOG("Failed to post a recv for the qpair %p with errno %d\n", rqpair, -rc); + while (bad_recv_wr != NULL) { + bad_recv_wr = bad_recv_wr->next; + rqpair->current_recv_depth++; + } + nvmf_rdma_start_disconnect(rqpair); +} + +static void +_poller_submit_recvs(struct spdk_nvmf_rdma_transport *rtransport, + struct spdk_nvmf_rdma_poller *rpoller) +{ + struct spdk_nvmf_rdma_qpair *rqpair; + struct ibv_recv_wr *bad_recv_wr; + int rc; + + if (rpoller->srq) { + if (rpoller->resources->recvs_to_post.first != NULL) { + rc = ibv_post_srq_recv(rpoller->srq, rpoller->resources->recvs_to_post.first, &bad_recv_wr); + if (rc) { + _poller_reset_failed_recvs(rpoller, bad_recv_wr, rc); + } + rpoller->resources->recvs_to_post.first = NULL; + rpoller->resources->recvs_to_post.last = NULL; + } + } else { + while (!STAILQ_EMPTY(&rpoller->qpairs_pending_recv)) { + rqpair = STAILQ_FIRST(&rpoller->qpairs_pending_recv); + assert(rqpair->resources->recvs_to_post.first != NULL); + rc = ibv_post_recv(rqpair->rdma_qp->qp, rqpair->resources->recvs_to_post.first, &bad_recv_wr); + if (rc) { + _qp_reset_failed_recvs(rqpair, bad_recv_wr, rc); + } + rqpair->resources->recvs_to_post.first = NULL; + rqpair->resources->recvs_to_post.last = NULL; + STAILQ_REMOVE_HEAD(&rpoller->qpairs_pending_recv, recv_link); + } + } +} + +static void +_qp_reset_failed_sends(struct spdk_nvmf_rdma_transport *rtransport, + struct spdk_nvmf_rdma_qpair *rqpair, struct ibv_send_wr *bad_wr, int rc) +{ + struct spdk_nvmf_rdma_wr *bad_rdma_wr; + struct spdk_nvmf_rdma_request *prev_rdma_req = NULL, *cur_rdma_req = NULL; + + SPDK_ERRLOG("Failed to post a send for the qpair %p with errno %d\n", rqpair, -rc); + for (; bad_wr != NULL; bad_wr = bad_wr->next) { + bad_rdma_wr = (struct spdk_nvmf_rdma_wr *)bad_wr->wr_id; + assert(rqpair->current_send_depth > 0); + rqpair->current_send_depth--; + switch (bad_rdma_wr->type) { + case RDMA_WR_TYPE_DATA: + cur_rdma_req = SPDK_CONTAINEROF(bad_rdma_wr, struct spdk_nvmf_rdma_request, data.rdma_wr); + if (bad_wr->opcode == IBV_WR_RDMA_READ) { + assert(rqpair->current_read_depth > 0); + rqpair->current_read_depth--; + } + break; + case RDMA_WR_TYPE_SEND: + cur_rdma_req = SPDK_CONTAINEROF(bad_rdma_wr, struct spdk_nvmf_rdma_request, rsp.rdma_wr); + break; + default: + SPDK_ERRLOG("Found a RECV in the list of pending SEND requests for qpair %p\n", rqpair); + prev_rdma_req = cur_rdma_req; + continue; + } + + if (prev_rdma_req == cur_rdma_req) { + /* this request was handled by an earlier wr. i.e. we were performing an nvme read. */ + /* We only have to check against prev_wr since each requests wrs are contiguous in this list. */ + continue; + } + + switch (cur_rdma_req->state) { + case RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER: + cur_rdma_req->req.rsp->nvme_cpl.status.sc = SPDK_NVME_SC_INTERNAL_DEVICE_ERROR; + cur_rdma_req->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE; + break; + case RDMA_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST: + case RDMA_REQUEST_STATE_COMPLETING: + cur_rdma_req->state = RDMA_REQUEST_STATE_COMPLETED; + break; + default: + SPDK_ERRLOG("Found a request in a bad state %d when draining pending SEND requests for qpair %p\n", + cur_rdma_req->state, rqpair); + continue; + } + + nvmf_rdma_request_process(rtransport, cur_rdma_req); + prev_rdma_req = cur_rdma_req; + } + + if (rqpair->qpair.state == SPDK_NVMF_QPAIR_ACTIVE) { + /* Disconnect the connection. */ + nvmf_rdma_start_disconnect(rqpair); + } + +} + +static void +_poller_submit_sends(struct spdk_nvmf_rdma_transport *rtransport, + struct spdk_nvmf_rdma_poller *rpoller) +{ + struct spdk_nvmf_rdma_qpair *rqpair; + struct ibv_send_wr *bad_wr = NULL; + int rc; + + while (!STAILQ_EMPTY(&rpoller->qpairs_pending_send)) { + rqpair = STAILQ_FIRST(&rpoller->qpairs_pending_send); + rc = spdk_rdma_qp_flush_send_wrs(rqpair->rdma_qp, &bad_wr); + + /* bad wr always points to the first wr that failed. */ + if (rc) { + _qp_reset_failed_sends(rtransport, rqpair, bad_wr, rc); + } + STAILQ_REMOVE_HEAD(&rpoller->qpairs_pending_send, send_link); + } +} + +static int +nvmf_rdma_poller_poll(struct spdk_nvmf_rdma_transport *rtransport, + struct spdk_nvmf_rdma_poller *rpoller) +{ + struct ibv_wc wc[32]; + struct spdk_nvmf_rdma_wr *rdma_wr; + struct spdk_nvmf_rdma_request *rdma_req; + struct spdk_nvmf_rdma_recv *rdma_recv; + struct spdk_nvmf_rdma_qpair *rqpair; + int reaped, i; + int count = 0; + bool error = false; + uint64_t poll_tsc = spdk_get_ticks(); + + /* Poll for completing operations. */ + reaped = ibv_poll_cq(rpoller->cq, 32, wc); + if (reaped < 0) { + SPDK_ERRLOG("Error polling CQ! (%d): %s\n", + errno, spdk_strerror(errno)); + return -1; + } + + rpoller->stat.polls++; + rpoller->stat.completions += reaped; + + for (i = 0; i < reaped; i++) { + + rdma_wr = (struct spdk_nvmf_rdma_wr *)wc[i].wr_id; + + switch (rdma_wr->type) { + case RDMA_WR_TYPE_SEND: + rdma_req = SPDK_CONTAINEROF(rdma_wr, struct spdk_nvmf_rdma_request, rsp.rdma_wr); + rqpair = SPDK_CONTAINEROF(rdma_req->req.qpair, struct spdk_nvmf_rdma_qpair, qpair); + + if (!wc[i].status) { + count++; + assert(wc[i].opcode == IBV_WC_SEND); + assert(nvmf_rdma_req_is_completing(rdma_req)); + } + + rdma_req->state = RDMA_REQUEST_STATE_COMPLETED; + /* RDMA_WRITE operation completed. +1 since it was chained with rsp WR */ + rqpair->current_send_depth -= rdma_req->num_outstanding_data_wr + 1; + rdma_req->num_outstanding_data_wr = 0; + + nvmf_rdma_request_process(rtransport, rdma_req); + break; + case RDMA_WR_TYPE_RECV: + /* rdma_recv->qpair will be invalid if using an SRQ. In that case we have to get the qpair from the wc. */ + rdma_recv = SPDK_CONTAINEROF(rdma_wr, struct spdk_nvmf_rdma_recv, rdma_wr); + if (rpoller->srq != NULL) { + rdma_recv->qpair = get_rdma_qpair_from_wc(rpoller, &wc[i]); + /* It is possible that there are still some completions for destroyed QP + * associated with SRQ. We just ignore these late completions and re-post + * receive WRs back to SRQ. + */ + if (spdk_unlikely(NULL == rdma_recv->qpair)) { + struct ibv_recv_wr *bad_wr; + int rc; + + rdma_recv->wr.next = NULL; + rc = ibv_post_srq_recv(rpoller->srq, + &rdma_recv->wr, + &bad_wr); + if (rc) { + SPDK_ERRLOG("Failed to re-post recv WR to SRQ, err %d\n", rc); + } + continue; + } + } + rqpair = rdma_recv->qpair; + + assert(rqpair != NULL); + if (!wc[i].status) { + assert(wc[i].opcode == IBV_WC_RECV); + if (rqpair->current_recv_depth >= rqpair->max_queue_depth) { + nvmf_rdma_start_disconnect(rqpair); + break; + } + } + + rdma_recv->wr.next = NULL; + rqpair->current_recv_depth++; + rdma_recv->receive_tsc = poll_tsc; + rpoller->stat.requests++; + STAILQ_INSERT_TAIL(&rqpair->resources->incoming_queue, rdma_recv, link); + break; + case RDMA_WR_TYPE_DATA: + rdma_req = SPDK_CONTAINEROF(rdma_wr, struct spdk_nvmf_rdma_request, data.rdma_wr); + rqpair = SPDK_CONTAINEROF(rdma_req->req.qpair, struct spdk_nvmf_rdma_qpair, qpair); + + assert(rdma_req->num_outstanding_data_wr > 0); + + rqpair->current_send_depth--; + rdma_req->num_outstanding_data_wr--; + if (!wc[i].status) { + assert(wc[i].opcode == IBV_WC_RDMA_READ); + rqpair->current_read_depth--; + /* wait for all outstanding reads associated with the same rdma_req to complete before proceeding. */ + if (rdma_req->num_outstanding_data_wr == 0) { + rdma_req->state = RDMA_REQUEST_STATE_READY_TO_EXECUTE; + nvmf_rdma_request_process(rtransport, rdma_req); + } + } else { + /* If the data transfer fails still force the queue into the error state, + * if we were performing an RDMA_READ, we need to force the request into a + * completed state since it wasn't linked to a send. However, in the RDMA_WRITE + * case, we should wait for the SEND to complete. */ + if (rdma_req->data.wr.opcode == IBV_WR_RDMA_READ) { + rqpair->current_read_depth--; + if (rdma_req->num_outstanding_data_wr == 0) { + rdma_req->state = RDMA_REQUEST_STATE_COMPLETED; + } + } + } + break; + default: + SPDK_ERRLOG("Received an unknown opcode on the CQ: %d\n", wc[i].opcode); + continue; + } + + /* Handle error conditions */ + if (wc[i].status) { + if ((rdma_wr->type == RDMA_WR_TYPE_RECV && !rpoller->srq)) { + /* When we don't use SRQ and close a qpair, we will receive completions with error + * status for all posted ibv_recv_wrs. This is expected and we don't want to log + * an error in that case. */ + SPDK_DEBUGLOG(SPDK_LOG_RDMA, "Error on CQ %p, request 0x%lu, type %d, status: (%d): %s\n", + rpoller->cq, wc[i].wr_id, rdma_wr->type, wc[i].status, ibv_wc_status_str(wc[i].status)); + } else { + SPDK_ERRLOG("Error on CQ %p, request 0x%lu, type %d, status: (%d): %s\n", + rpoller->cq, wc[i].wr_id, rdma_wr->type, wc[i].status, ibv_wc_status_str(wc[i].status)); + } + + error = true; + + if (rqpair->qpair.state == SPDK_NVMF_QPAIR_ACTIVE) { + /* Disconnect the connection. */ + nvmf_rdma_start_disconnect(rqpair); + } else { + nvmf_rdma_destroy_drained_qpair(rqpair); + } + continue; + } + + nvmf_rdma_qpair_process_pending(rtransport, rqpair, false); + + if (rqpair->qpair.state != SPDK_NVMF_QPAIR_ACTIVE) { + nvmf_rdma_destroy_drained_qpair(rqpair); + } + } + + if (error == true) { + return -1; + } + + /* submit outstanding work requests. */ + _poller_submit_recvs(rtransport, rpoller); + _poller_submit_sends(rtransport, rpoller); + + return count; +} + +static int +nvmf_rdma_poll_group_poll(struct spdk_nvmf_transport_poll_group *group) +{ + struct spdk_nvmf_rdma_transport *rtransport; + struct spdk_nvmf_rdma_poll_group *rgroup; + struct spdk_nvmf_rdma_poller *rpoller; + int count, rc; + + rtransport = SPDK_CONTAINEROF(group->transport, struct spdk_nvmf_rdma_transport, transport); + rgroup = SPDK_CONTAINEROF(group, struct spdk_nvmf_rdma_poll_group, group); + + count = 0; + TAILQ_FOREACH(rpoller, &rgroup->pollers, link) { + rc = nvmf_rdma_poller_poll(rtransport, rpoller); + if (rc < 0) { + return rc; + } + count += rc; + } + + return count; +} + +static int +nvmf_rdma_trid_from_cm_id(struct rdma_cm_id *id, + struct spdk_nvme_transport_id *trid, + bool peer) +{ + struct sockaddr *saddr; + uint16_t port; + + spdk_nvme_trid_populate_transport(trid, SPDK_NVME_TRANSPORT_RDMA); + + if (peer) { + saddr = rdma_get_peer_addr(id); + } else { + saddr = rdma_get_local_addr(id); + } + switch (saddr->sa_family) { + case AF_INET: { + struct sockaddr_in *saddr_in = (struct sockaddr_in *)saddr; + + trid->adrfam = SPDK_NVMF_ADRFAM_IPV4; + inet_ntop(AF_INET, &saddr_in->sin_addr, + trid->traddr, sizeof(trid->traddr)); + if (peer) { + port = ntohs(rdma_get_dst_port(id)); + } else { + port = ntohs(rdma_get_src_port(id)); + } + snprintf(trid->trsvcid, sizeof(trid->trsvcid), "%u", port); + break; + } + case AF_INET6: { + struct sockaddr_in6 *saddr_in = (struct sockaddr_in6 *)saddr; + trid->adrfam = SPDK_NVMF_ADRFAM_IPV6; + inet_ntop(AF_INET6, &saddr_in->sin6_addr, + trid->traddr, sizeof(trid->traddr)); + if (peer) { + port = ntohs(rdma_get_dst_port(id)); + } else { + port = ntohs(rdma_get_src_port(id)); + } + snprintf(trid->trsvcid, sizeof(trid->trsvcid), "%u", port); + break; + } + default: + return -1; + + } + + return 0; +} + +static int +nvmf_rdma_qpair_get_peer_trid(struct spdk_nvmf_qpair *qpair, + struct spdk_nvme_transport_id *trid) +{ + struct spdk_nvmf_rdma_qpair *rqpair; + + rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair); + + return nvmf_rdma_trid_from_cm_id(rqpair->cm_id, trid, true); +} + +static int +nvmf_rdma_qpair_get_local_trid(struct spdk_nvmf_qpair *qpair, + struct spdk_nvme_transport_id *trid) +{ + struct spdk_nvmf_rdma_qpair *rqpair; + + rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair); + + return nvmf_rdma_trid_from_cm_id(rqpair->cm_id, trid, false); +} + +static int +nvmf_rdma_qpair_get_listen_trid(struct spdk_nvmf_qpair *qpair, + struct spdk_nvme_transport_id *trid) +{ + struct spdk_nvmf_rdma_qpair *rqpair; + + rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair); + + return nvmf_rdma_trid_from_cm_id(rqpair->listen_id, trid, false); +} + +void +spdk_nvmf_rdma_init_hooks(struct spdk_nvme_rdma_hooks *hooks) +{ + g_nvmf_hooks = *hooks; +} + +static void +nvmf_rdma_request_set_abort_status(struct spdk_nvmf_request *req, + struct spdk_nvmf_rdma_request *rdma_req_to_abort) +{ + rdma_req_to_abort->req.rsp->nvme_cpl.status.sct = SPDK_NVME_SCT_GENERIC; + rdma_req_to_abort->req.rsp->nvme_cpl.status.sc = SPDK_NVME_SC_ABORTED_BY_REQUEST; + + rdma_req_to_abort->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE; + + req->rsp->nvme_cpl.cdw0 &= ~1U; /* Command was successfully aborted. */ +} + +static int +_nvmf_rdma_qpair_abort_request(void *ctx) +{ + struct spdk_nvmf_request *req = ctx; + struct spdk_nvmf_rdma_request *rdma_req_to_abort = SPDK_CONTAINEROF( + req->req_to_abort, struct spdk_nvmf_rdma_request, req); + struct spdk_nvmf_rdma_qpair *rqpair = SPDK_CONTAINEROF(req->req_to_abort->qpair, + struct spdk_nvmf_rdma_qpair, qpair); + int rc; + + spdk_poller_unregister(&req->poller); + + switch (rdma_req_to_abort->state) { + case RDMA_REQUEST_STATE_EXECUTING: + rc = nvmf_ctrlr_abort_request(req); + if (rc == SPDK_NVMF_REQUEST_EXEC_STATUS_ASYNCHRONOUS) { + return SPDK_POLLER_BUSY; + } + break; + + case RDMA_REQUEST_STATE_NEED_BUFFER: + STAILQ_REMOVE(&rqpair->poller->group->group.pending_buf_queue, + &rdma_req_to_abort->req, spdk_nvmf_request, buf_link); + + nvmf_rdma_request_set_abort_status(req, rdma_req_to_abort); + break; + + case RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING: + STAILQ_REMOVE(&rqpair->pending_rdma_read_queue, rdma_req_to_abort, + spdk_nvmf_rdma_request, state_link); + + nvmf_rdma_request_set_abort_status(req, rdma_req_to_abort); + break; + + case RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING: + STAILQ_REMOVE(&rqpair->pending_rdma_write_queue, rdma_req_to_abort, + spdk_nvmf_rdma_request, state_link); + + nvmf_rdma_request_set_abort_status(req, rdma_req_to_abort); + break; + + case RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER: + if (spdk_get_ticks() < req->timeout_tsc) { + req->poller = SPDK_POLLER_REGISTER(_nvmf_rdma_qpair_abort_request, req, 0); + return SPDK_POLLER_BUSY; + } + break; + + default: + break; + } + + spdk_nvmf_request_complete(req); + return SPDK_POLLER_BUSY; +} + +static void +nvmf_rdma_qpair_abort_request(struct spdk_nvmf_qpair *qpair, + struct spdk_nvmf_request *req) +{ + struct spdk_nvmf_rdma_qpair *rqpair; + struct spdk_nvmf_rdma_transport *rtransport; + struct spdk_nvmf_transport *transport; + uint16_t cid; + uint32_t i; + struct spdk_nvmf_rdma_request *rdma_req_to_abort = NULL; + + rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair); + rtransport = SPDK_CONTAINEROF(qpair->transport, struct spdk_nvmf_rdma_transport, transport); + transport = &rtransport->transport; + + cid = req->cmd->nvme_cmd.cdw10_bits.abort.cid; + + for (i = 0; i < rqpair->max_queue_depth; i++) { + rdma_req_to_abort = &rqpair->resources->reqs[i]; + + if (rdma_req_to_abort->state != RDMA_REQUEST_STATE_FREE && + rdma_req_to_abort->req.cmd->nvme_cmd.cid == cid) { + break; + } + } + + if (rdma_req_to_abort == NULL) { + spdk_nvmf_request_complete(req); + return; + } + + req->req_to_abort = &rdma_req_to_abort->req; + req->timeout_tsc = spdk_get_ticks() + + transport->opts.abort_timeout_sec * spdk_get_ticks_hz(); + req->poller = NULL; + + _nvmf_rdma_qpair_abort_request(req); +} + +static int +nvmf_rdma_poll_group_get_stat(struct spdk_nvmf_tgt *tgt, + struct spdk_nvmf_transport_poll_group_stat **stat) +{ + struct spdk_io_channel *ch; + struct spdk_nvmf_poll_group *group; + struct spdk_nvmf_transport_poll_group *tgroup; + struct spdk_nvmf_rdma_poll_group *rgroup; + struct spdk_nvmf_rdma_poller *rpoller; + struct spdk_nvmf_rdma_device_stat *device_stat; + uint64_t num_devices = 0; + + if (tgt == NULL || stat == NULL) { + return -EINVAL; + } + + ch = spdk_get_io_channel(tgt); + group = spdk_io_channel_get_ctx(ch);; + spdk_put_io_channel(ch); + TAILQ_FOREACH(tgroup, &group->tgroups, link) { + if (SPDK_NVME_TRANSPORT_RDMA == tgroup->transport->ops->type) { + *stat = calloc(1, sizeof(struct spdk_nvmf_transport_poll_group_stat)); + if (!*stat) { + SPDK_ERRLOG("Failed to allocate memory for NVMf RDMA statistics\n"); + return -ENOMEM; + } + (*stat)->trtype = SPDK_NVME_TRANSPORT_RDMA; + + rgroup = SPDK_CONTAINEROF(tgroup, struct spdk_nvmf_rdma_poll_group, group); + /* Count devices to allocate enough memory */ + TAILQ_FOREACH(rpoller, &rgroup->pollers, link) { + ++num_devices; + } + (*stat)->rdma.devices = calloc(num_devices, sizeof(struct spdk_nvmf_rdma_device_stat)); + if (!(*stat)->rdma.devices) { + SPDK_ERRLOG("Failed to allocate NVMf RDMA devices statistics\n"); + free(*stat); + return -ENOMEM; + } + + (*stat)->rdma.pending_data_buffer = rgroup->stat.pending_data_buffer; + (*stat)->rdma.num_devices = num_devices; + num_devices = 0; + TAILQ_FOREACH(rpoller, &rgroup->pollers, link) { + device_stat = &(*stat)->rdma.devices[num_devices++]; + device_stat->name = ibv_get_device_name(rpoller->device->context->device); + device_stat->polls = rpoller->stat.polls; + device_stat->completions = rpoller->stat.completions; + device_stat->requests = rpoller->stat.requests; + device_stat->request_latency = rpoller->stat.request_latency; + device_stat->pending_free_request = rpoller->stat.pending_free_request; + device_stat->pending_rdma_read = rpoller->stat.pending_rdma_read; + device_stat->pending_rdma_write = rpoller->stat.pending_rdma_write; + } + return 0; + } + } + return -ENOENT; +} + +static void +nvmf_rdma_poll_group_free_stat(struct spdk_nvmf_transport_poll_group_stat *stat) +{ + if (stat) { + free(stat->rdma.devices); + } + free(stat); +} + +const struct spdk_nvmf_transport_ops spdk_nvmf_transport_rdma = { + .name = "RDMA", + .type = SPDK_NVME_TRANSPORT_RDMA, + .opts_init = nvmf_rdma_opts_init, + .create = nvmf_rdma_create, + .destroy = nvmf_rdma_destroy, + + .listen = nvmf_rdma_listen, + .stop_listen = nvmf_rdma_stop_listen, + .accept = nvmf_rdma_accept, + .cdata_init = nvmf_rdma_cdata_init, + + .listener_discover = nvmf_rdma_discover, + + .poll_group_create = nvmf_rdma_poll_group_create, + .get_optimal_poll_group = nvmf_rdma_get_optimal_poll_group, + .poll_group_destroy = nvmf_rdma_poll_group_destroy, + .poll_group_add = nvmf_rdma_poll_group_add, + .poll_group_remove = nvmf_rdma_poll_group_remove, + .poll_group_poll = nvmf_rdma_poll_group_poll, + + .req_free = nvmf_rdma_request_free, + .req_complete = nvmf_rdma_request_complete, + + .qpair_fini = nvmf_rdma_close_qpair, + .qpair_get_peer_trid = nvmf_rdma_qpair_get_peer_trid, + .qpair_get_local_trid = nvmf_rdma_qpair_get_local_trid, + .qpair_get_listen_trid = nvmf_rdma_qpair_get_listen_trid, + .qpair_abort_request = nvmf_rdma_qpair_abort_request, + + .poll_group_get_stat = nvmf_rdma_poll_group_get_stat, + .poll_group_free_stat = nvmf_rdma_poll_group_free_stat, +}; + +SPDK_NVMF_TRANSPORT_REGISTER(rdma, &spdk_nvmf_transport_rdma); +SPDK_LOG_REGISTER_COMPONENT("rdma", SPDK_LOG_RDMA) |