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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0
 /*
  * NVMe over Fabrics RDMA host code.
  * Copyright (c) 2015-2016 HGST, a Western Digital Company.
  */
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <rdma/mr_pool.h>
 #include <linux/err.h>
 #include <linux/string.h>
 #include <linux/atomic.h>
 #include <linux/blk-mq.h>
 #include <linux/blk-mq-rdma.h>
 #include <linux/blk-integrity.h>
 #include <linux/types.h>
 #include <linux/list.h>
 #include <linux/mutex.h>
 #include <linux/scatterlist.h>
 #include <linux/nvme.h>
 #include <asm/unaligned.h>
 
 #include <rdma/ib_verbs.h>
 #include <rdma/rdma_cm.h>
 #include <linux/nvme-rdma.h>
 
 #include "nvme.h"
 #include "fabrics.h"
 
 
 #define NVME_RDMA_CM_TIMEOUT_MS     3000        /* 3 second */
 
 #define NVME_RDMA_MAX_SEGMENTS      256
 
 #define NVME_RDMA_MAX_INLINE_SEGMENTS   4
 
 #define NVME_RDMA_DATA_SGL_SIZE \
     (sizeof(struct scatterlist) * NVME_INLINE_SG_CNT)
 #define NVME_RDMA_METADATA_SGL_SIZE \
     (sizeof(struct scatterlist) * NVME_INLINE_METADATA_SG_CNT)
 
 struct nvme_rdma_device {
     struct ib_device    *dev;
     struct ib_pd        *pd;
     struct kref     ref;
     struct list_head    entry;
     unsigned int        num_inline_segments;
 };
 
 struct nvme_rdma_qe {
     struct ib_cqe       cqe;
     void            *data;
     u64         dma;
 };
 
 struct nvme_rdma_sgl {
     int         nents;
     struct sg_table     sg_table;
 };
 
 struct nvme_rdma_queue;
 struct nvme_rdma_request {
     struct nvme_request req;
     struct ib_mr        *mr;
     struct nvme_rdma_qe sqe;
     union nvme_result   result;
     __le16          status;
     refcount_t      ref;
     struct ib_sge       sge[1 + NVME_RDMA_MAX_INLINE_SEGMENTS];
     u32         num_sge;
     struct ib_reg_wr    reg_wr;
     struct ib_cqe       reg_cqe;
     struct nvme_rdma_queue  *queue;
     struct nvme_rdma_sgl    data_sgl;
     struct nvme_rdma_sgl    *metadata_sgl;
     bool            use_sig_mr;
 };
 
 enum nvme_rdma_queue_flags {
     NVME_RDMA_Q_ALLOCATED       = 0,
     NVME_RDMA_Q_LIVE        = 1,
     NVME_RDMA_Q_TR_READY        = 2,
 };
 
 struct nvme_rdma_queue {
     struct nvme_rdma_qe *rsp_ring;
     int         queue_size;
     size_t          cmnd_capsule_len;
     struct nvme_rdma_ctrl   *ctrl;
     struct nvme_rdma_device *device;
     struct ib_cq        *ib_cq;
     struct ib_qp        *qp;
 
     unsigned long       flags;
     struct rdma_cm_id   *cm_id;
     int         cm_error;
     struct completion   cm_done;
     bool            pi_support;
     int         cq_size;
     struct mutex        queue_lock;
 };
 
 struct nvme_rdma_ctrl {
     /* read only in the hot path */
     struct nvme_rdma_queue  *queues;
 
     /* other member variables */
     struct blk_mq_tag_set   tag_set;
     struct work_struct  err_work;
 
     struct nvme_rdma_qe async_event_sqe;
 
     struct delayed_work reconnect_work;
 
     struct list_head    list;
 
     struct blk_mq_tag_set   admin_tag_set;
     struct nvme_rdma_device *device;
 
     u32         max_fr_pages;
 
     struct sockaddr_storage addr;
     struct sockaddr_storage src_addr;
 
     struct nvme_ctrl    ctrl;
     bool            use_inline_data;
     u32         io_queues[HCTX_MAX_TYPES];
 };
 
 static inline struct nvme_rdma_ctrl *to_rdma_ctrl(struct nvme_ctrl *ctrl)
 {
     return container_of(ctrl, struct nvme_rdma_ctrl, ctrl);
 }
 
 static LIST_HEAD(device_list);
 static DEFINE_MUTEX(device_list_mutex);
 
 static LIST_HEAD(nvme_rdma_ctrl_list);
 static DEFINE_MUTEX(nvme_rdma_ctrl_mutex);
 
 /*
  * Disabling this option makes small I/O goes faster, but is fundamentally
  * unsafe.  With it turned off we will have to register a global rkey that
  * allows read and write access to all physical memory.
  */
 static bool register_always = true;
 module_param(register_always, bool, 0444);
 MODULE_PARM_DESC(register_always,
      "Use memory registration even for contiguous memory regions");
 
 static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
         struct rdma_cm_event *event);
 static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
 static void nvme_rdma_complete_rq(struct request *rq);
 
 static const struct blk_mq_ops nvme_rdma_mq_ops;
 static const struct blk_mq_ops nvme_rdma_admin_mq_ops;
 
 static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue *queue)
 {
     return queue - queue->ctrl->queues;
 }
 
 static bool nvme_rdma_poll_queue(struct nvme_rdma_queue *queue)
 {
     return nvme_rdma_queue_idx(queue) >
         queue->ctrl->io_queues[HCTX_TYPE_DEFAULT] +
         queue->ctrl->io_queues[HCTX_TYPE_READ];
 }
 
 static inline size_t nvme_rdma_inline_data_size(struct nvme_rdma_queue *queue)
 {
     return queue->cmnd_capsule_len - sizeof(struct nvme_command);
 }
 
 static void nvme_rdma_free_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
         size_t capsule_size, enum dma_data_direction dir)
 {
     ib_dma_unmap_single(ibdev, qe->dma, capsule_size, dir);
     kfree(qe->data);
 }
 
 static int nvme_rdma_alloc_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
         size_t capsule_size, enum dma_data_direction dir)
 {
     qe->data = kzalloc(capsule_size, GFP_KERNEL);
     if (!qe->data)
         return -ENOMEM;
 
     qe->dma = ib_dma_map_single(ibdev, qe->data, capsule_size, dir);
     if (ib_dma_mapping_error(ibdev, qe->dma)) {
         kfree(qe->data);
         qe->data = NULL;
         return -ENOMEM;
     }
 
     return 0;
 }
 
 static void nvme_rdma_free_ring(struct ib_device *ibdev,
         struct nvme_rdma_qe *ring, size_t ib_queue_size,
         size_t capsule_size, enum dma_data_direction dir)
 {
     int i;
 
     for (i = 0; i < ib_queue_size; i++)
         nvme_rdma_free_qe(ibdev, &ring[i], capsule_size, dir);
     kfree(ring);
 }
 
 static struct nvme_rdma_qe *nvme_rdma_alloc_ring(struct ib_device *ibdev,
         size_t ib_queue_size, size_t capsule_size,
         enum dma_data_direction dir)
 {
     struct nvme_rdma_qe *ring;
     int i;
 
     ring = kcalloc(ib_queue_size, sizeof(struct nvme_rdma_qe), GFP_KERNEL);
     if (!ring)
         return NULL;
 
     /*
      * Bind the CQEs (post recv buffers) DMA mapping to the RDMA queue
      * lifetime. It's safe, since any chage in the underlying RDMA device
      * will issue error recovery and queue re-creation.
      */
     for (i = 0; i < ib_queue_size; i++) {
         if (nvme_rdma_alloc_qe(ibdev, &ring[i], capsule_size, dir))
             goto out_free_ring;
     }
 
     return ring;
 
 out_free_ring:
     nvme_rdma_free_ring(ibdev, ring, i, capsule_size, dir);
     return NULL;
 }
 
 static void nvme_rdma_qp_event(struct ib_event *event, void *context)
 {
     pr_debug("QP event %s (%d)\n",
          ib_event_msg(event->event), event->event);
 
 }
 
 static int nvme_rdma_wait_for_cm(struct nvme_rdma_queue *queue)
 {
     int ret;
 
     ret = wait_for_completion_interruptible(&queue->cm_done);
     if (ret)
         return ret;
     WARN_ON_ONCE(queue->cm_error > 0);
     return queue->cm_error;
 }
 
 static int nvme_rdma_create_qp(struct nvme_rdma_queue *queue, const int factor)
 {
     struct nvme_rdma_device *dev = queue->device;
     struct ib_qp_init_attr init_attr;
     int ret;
 
     memset(&init_attr, 0, sizeof(init_attr));
     init_attr.event_handler = nvme_rdma_qp_event;
     /* +1 for drain */
     init_attr.cap.max_send_wr = factor * queue->queue_size + 1;
     /* +1 for drain */
     init_attr.cap.max_recv_wr = queue->queue_size + 1;
     init_attr.cap.max_recv_sge = 1;
     init_attr.cap.max_send_sge = 1 + dev->num_inline_segments;
     init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
     init_attr.qp_type = IB_QPT_RC;
     init_attr.send_cq = queue->ib_cq;
     init_attr.recv_cq = queue->ib_cq;
     if (queue->pi_support)
         init_attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN;
     init_attr.qp_context = queue;
 
     ret = rdma_create_qp(queue->cm_id, dev->pd, &init_attr);
 
     queue->qp = queue->cm_id->qp;
     return ret;
 }
 
 static void nvme_rdma_exit_request(struct blk_mq_tag_set *set,
         struct request *rq, unsigned int hctx_idx)
 {
     struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
 
     kfree(req->sqe.data);
 }
 
 static int nvme_rdma_init_request(struct blk_mq_tag_set *set,
         struct request *rq, unsigned int hctx_idx,
         unsigned int numa_node)
 {
     struct nvme_rdma_ctrl *ctrl = set->driver_data;
     struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
     int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0;
     struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];
 
     nvme_req(rq)->ctrl = &ctrl->ctrl;
     req->sqe.data = kzalloc(sizeof(struct nvme_command), GFP_KERNEL);
     if (!req->sqe.data)
         return -ENOMEM;
 
     /* metadata nvme_rdma_sgl struct is located after command's data SGL */
     if (queue->pi_support)
         req->metadata_sgl = (void *)nvme_req(rq) +
             sizeof(struct nvme_rdma_request) +
             NVME_RDMA_DATA_SGL_SIZE;
 
     req->queue = queue;
     nvme_req(rq)->cmd = req->sqe.data;
 
     return 0;
 }
 
 static int nvme_rdma_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
         unsigned int hctx_idx)
 {
     struct nvme_rdma_ctrl *ctrl = data;
     struct nvme_rdma_queue *queue = &ctrl->queues[hctx_idx + 1];
 
     BUG_ON(hctx_idx >= ctrl->ctrl.queue_count);
 
     hctx->driver_data = queue;
     return 0;
 }
 
 static int nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
         unsigned int hctx_idx)
 {
     struct nvme_rdma_ctrl *ctrl = data;
     struct nvme_rdma_queue *queue = &ctrl->queues[0];
 
     BUG_ON(hctx_idx != 0);
 
     hctx->driver_data = queue;
     return 0;
 }
 
 static void nvme_rdma_free_dev(struct kref *ref)
 {
     struct nvme_rdma_device *ndev =
         container_of(ref, struct nvme_rdma_device, ref);
 
     mutex_lock(&device_list_mutex);
     list_del(&ndev->entry);
     mutex_unlock(&device_list_mutex);
 
     ib_dealloc_pd(ndev->pd);
     kfree(ndev);
 }
 
 static void nvme_rdma_dev_put(struct nvme_rdma_device *dev)
 {
     kref_put(&dev->ref, nvme_rdma_free_dev);
 }
 
 static int nvme_rdma_dev_get(struct nvme_rdma_device *dev)
 {
     return kref_get_unless_zero(&dev->ref);
 }
 
 static struct nvme_rdma_device *
 nvme_rdma_find_get_device(struct rdma_cm_id *cm_id)
 {
     struct nvme_rdma_device *ndev;
 
     mutex_lock(&device_list_mutex);
     list_for_each_entry(ndev, &device_list, entry) {
         if (ndev->dev->node_guid == cm_id->device->node_guid &&
             nvme_rdma_dev_get(ndev))
             goto out_unlock;
     }
 
     ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
     if (!ndev)
         goto out_err;
 
     ndev->dev = cm_id->device;
     kref_init(&ndev->ref);
 
     ndev->pd = ib_alloc_pd(ndev->dev,
         register_always ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY);
     if (IS_ERR(ndev->pd))
         goto out_free_dev;
 
     if (!(ndev->dev->attrs.device_cap_flags &
           IB_DEVICE_MEM_MGT_EXTENSIONS)) {
         dev_err(&ndev->dev->dev,
             "Memory registrations not supported.\n");
         goto out_free_pd;
     }
 
     ndev->num_inline_segments = min(NVME_RDMA_MAX_INLINE_SEGMENTS,
                     ndev->dev->attrs.max_send_sge - 1);
     list_add(&ndev->entry, &device_list);
 out_unlock:
     mutex_unlock(&device_list_mutex);
     return ndev;
 
 out_free_pd:
     ib_dealloc_pd(ndev->pd);
 out_free_dev:
     kfree(ndev);
 out_err:
     mutex_unlock(&device_list_mutex);
     return NULL;
 }
 
 static void nvme_rdma_free_cq(struct nvme_rdma_queue *queue)
 {
     if (nvme_rdma_poll_queue(queue))
         ib_free_cq(queue->ib_cq);
     else
         ib_cq_pool_put(queue->ib_cq, queue->cq_size);
 }
 
 static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue *queue)
 {
     struct nvme_rdma_device *dev;
     struct ib_device *ibdev;
 
     if (!test_and_clear_bit(NVME_RDMA_Q_TR_READY, &queue->flags))
         return;
 
     dev = queue->device;
     ibdev = dev->dev;
 
     if (queue->pi_support)
         ib_mr_pool_destroy(queue->qp, &queue->qp->sig_mrs);
     ib_mr_pool_destroy(queue->qp, &queue->qp->rdma_mrs);
 
     /*
      * The cm_id object might have been destroyed during RDMA connection
      * establishment error flow to avoid getting other cma events, thus
      * the destruction of the QP shouldn't use rdma_cm API.
      */
     ib_destroy_qp(queue->qp);
     nvme_rdma_free_cq(queue);
 
     nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,
             sizeof(struct nvme_completion), DMA_FROM_DEVICE);
 
     nvme_rdma_dev_put(dev);
 }
 
 static int nvme_rdma_get_max_fr_pages(struct ib_device *ibdev, bool pi_support)
 {
     u32 max_page_list_len;
 
     if (pi_support)
         max_page_list_len = ibdev->attrs.max_pi_fast_reg_page_list_len;
     else
         max_page_list_len = ibdev->attrs.max_fast_reg_page_list_len;
 
     return min_t(u32, NVME_RDMA_MAX_SEGMENTS, max_page_list_len - 1);
 }
 
 static int nvme_rdma_create_cq(struct ib_device *ibdev,
         struct nvme_rdma_queue *queue)
 {
     int ret, comp_vector, idx = nvme_rdma_queue_idx(queue);
     enum ib_poll_context poll_ctx;
 
     /*
      * Spread I/O queues completion vectors according their queue index.
      * Admin queues can always go on completion vector 0.
      */
     comp_vector = (idx == 0 ? idx : idx - 1) % ibdev->num_comp_vectors;
 
     /* Polling queues need direct cq polling context */
     if (nvme_rdma_poll_queue(queue)) {
         poll_ctx = IB_POLL_DIRECT;
         queue->ib_cq = ib_alloc_cq(ibdev, queue, queue->cq_size,
                        comp_vector, poll_ctx);
     } else {
         poll_ctx = IB_POLL_SOFTIRQ;
         queue->ib_cq = ib_cq_pool_get(ibdev, queue->cq_size,
                           comp_vector, poll_ctx);
     }
 
     if (IS_ERR(queue->ib_cq)) {
         ret = PTR_ERR(queue->ib_cq);
         return ret;
     }
 
     return 0;
 }
 
 static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue *queue)
 {
     struct ib_device *ibdev;
     const int send_wr_factor = 3;           /* MR, SEND, INV */
     const int cq_factor = send_wr_factor + 1;   /* + RECV */
     int ret, pages_per_mr;
 
     queue->device = nvme_rdma_find_get_device(queue->cm_id);
     if (!queue->device) {
         dev_err(queue->cm_id->device->dev.parent,
             "no client data found!\n");
         return -ECONNREFUSED;
     }
     ibdev = queue->device->dev;
 
     /* +1 for ib_stop_cq */
     queue->cq_size = cq_factor * queue->queue_size + 1;
 
     ret = nvme_rdma_create_cq(ibdev, queue);
     if (ret)
         goto out_put_dev;
 
     ret = nvme_rdma_create_qp(queue, send_wr_factor);
     if (ret)
         goto out_destroy_ib_cq;
 
     queue->rsp_ring = nvme_rdma_alloc_ring(ibdev, queue->queue_size,
             sizeof(struct nvme_completion), DMA_FROM_DEVICE);
     if (!queue->rsp_ring) {
         ret = -ENOMEM;
         goto out_destroy_qp;
     }
 
     /*
      * Currently we don't use SG_GAPS MR's so if the first entry is
      * misaligned we'll end up using two entries for a single data page,
      * so one additional entry is required.
      */
     pages_per_mr = nvme_rdma_get_max_fr_pages(ibdev, queue->pi_support) + 1;
     ret = ib_mr_pool_init(queue->qp, &queue->qp->rdma_mrs,
                   queue->queue_size,
                   IB_MR_TYPE_MEM_REG,
                   pages_per_mr, 0);
     if (ret) {
         dev_err(queue->ctrl->ctrl.device,
             "failed to initialize MR pool sized %d for QID %d\n",
             queue->queue_size, nvme_rdma_queue_idx(queue));
         goto out_destroy_ring;
     }
 
     if (queue->pi_support) {
         ret = ib_mr_pool_init(queue->qp, &queue->qp->sig_mrs,
                       queue->queue_size, IB_MR_TYPE_INTEGRITY,
                       pages_per_mr, pages_per_mr);
         if (ret) {
             dev_err(queue->ctrl->ctrl.device,
                 "failed to initialize PI MR pool sized %d for QID %d\n",
                 queue->queue_size, nvme_rdma_queue_idx(queue));
             goto out_destroy_mr_pool;
         }
     }
 
     set_bit(NVME_RDMA_Q_TR_READY, &queue->flags);
 
     return 0;
 
 out_destroy_mr_pool:
     ib_mr_pool_destroy(queue->qp, &queue->qp->rdma_mrs);
 out_destroy_ring:
     nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,
                 sizeof(struct nvme_completion), DMA_FROM_DEVICE);
 out_destroy_qp:
     rdma_destroy_qp(queue->cm_id);
 out_destroy_ib_cq:
     nvme_rdma_free_cq(queue);
 out_put_dev:
     nvme_rdma_dev_put(queue->device);
     return ret;
 }
 
 static int nvme_rdma_alloc_queue(struct nvme_rdma_ctrl *ctrl,
         int idx, size_t queue_size)
 {
     struct nvme_rdma_queue *queue;
     struct sockaddr *src_addr = NULL;
     int ret;
 
     queue = &ctrl->queues[idx];
     mutex_init(&queue->queue_lock);
     queue->ctrl = ctrl;
     if (idx && ctrl->ctrl.max_integrity_segments)
         queue->pi_support = true;
     else
         queue->pi_support = false;
     init_completion(&queue->cm_done);
 
     if (idx > 0)
         queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16;
     else
         queue->cmnd_capsule_len = sizeof(struct nvme_command);
 
     queue->queue_size = queue_size;
 
     queue->cm_id = rdma_create_id(&init_net, nvme_rdma_cm_handler, queue,
             RDMA_PS_TCP, IB_QPT_RC);
     if (IS_ERR(queue->cm_id)) {
         dev_info(ctrl->ctrl.device,
             "failed to create CM ID: %ld\n", PTR_ERR(queue->cm_id));
         ret = PTR_ERR(queue->cm_id);
         goto out_destroy_mutex;
     }
 
     if (ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR)
         src_addr = (struct sockaddr *)&ctrl->src_addr;
 
     queue->cm_error = -ETIMEDOUT;
     ret = rdma_resolve_addr(queue->cm_id, src_addr,
             (struct sockaddr *)&ctrl->addr,
             NVME_RDMA_CM_TIMEOUT_MS);
     if (ret) {
         dev_info(ctrl->ctrl.device,
             "rdma_resolve_addr failed (%d).\n", ret);
         goto out_destroy_cm_id;
     }
 
     ret = nvme_rdma_wait_for_cm(queue);
     if (ret) {
         dev_info(ctrl->ctrl.device,
             "rdma connection establishment failed (%d)\n", ret);
         goto out_destroy_cm_id;
     }
 
     set_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags);
 
     return 0;
 
 out_destroy_cm_id:
     rdma_destroy_id(queue->cm_id);
     nvme_rdma_destroy_queue_ib(queue);
 out_destroy_mutex:
     mutex_destroy(&queue->queue_lock);
     return ret;
 }
 
 static void __nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
 {
     rdma_disconnect(queue->cm_id);
     ib_drain_qp(queue->qp);
 }
 
 static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
 {
     mutex_lock(&queue->queue_lock);
     if (test_and_clear_bit(NVME_RDMA_Q_LIVE, &queue->flags))
         __nvme_rdma_stop_queue(queue);
     mutex_unlock(&queue->queue_lock);
 }
 
 static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue)
 {
     if (!test_and_clear_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags))
         return;
 
     rdma_destroy_id(queue->cm_id);
     nvme_rdma_destroy_queue_ib(queue);
     mutex_destroy(&queue->queue_lock);
 }
 
 static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl *ctrl)
 {
     int i;
 
     for (i = 1; i < ctrl->ctrl.queue_count; i++)
         nvme_rdma_free_queue(&ctrl->queues[i]);
 }
 
 static void nvme_rdma_stop_io_queues(struct nvme_rdma_ctrl *ctrl)
 {
     int i;
 
     for (i = 1; i < ctrl->ctrl.queue_count; i++)
         nvme_rdma_stop_queue(&ctrl->queues[i]);
 }
 
 static int nvme_rdma_start_queue(struct nvme_rdma_ctrl *ctrl, int idx)
 {
     struct nvme_rdma_queue *queue = &ctrl->queues[idx];
     int ret;
 
     if (idx)
         ret = nvmf_connect_io_queue(&ctrl->ctrl, idx);
     else
         ret = nvmf_connect_admin_queue(&ctrl->ctrl);
 
     if (!ret) {
         set_bit(NVME_RDMA_Q_LIVE, &queue->flags);
     } else {
         if (test_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags))
             __nvme_rdma_stop_queue(queue);
         dev_info(ctrl->ctrl.device,
             "failed to connect queue: %d ret=%d\n", idx, ret);
     }
     return ret;
 }
 
 static int nvme_rdma_start_io_queues(struct nvme_rdma_ctrl *ctrl)
 {
     int i, ret = 0;
 
     for (i = 1; i < ctrl->ctrl.queue_count; i++) {
         ret = nvme_rdma_start_queue(ctrl, i);
         if (ret)
             goto out_stop_queues;
     }
 
     return 0;
 
 out_stop_queues:
     for (i--; i >= 1; i--)
         nvme_rdma_stop_queue(&ctrl->queues[i]);
     return ret;
 }
 
 static int nvme_rdma_alloc_io_queues(struct nvme_rdma_ctrl *ctrl)
 {
     struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
     struct ib_device *ibdev = ctrl->device->dev;
     unsigned int nr_io_queues, nr_default_queues;
     unsigned int nr_read_queues, nr_poll_queues;
     int i, ret;
 
     nr_read_queues = min_t(unsigned int, ibdev->num_comp_vectors,
                 min(opts->nr_io_queues, num_online_cpus()));
     nr_default_queues =  min_t(unsigned int, ibdev->num_comp_vectors,
                 min(opts->nr_write_queues, num_online_cpus()));
     nr_poll_queues = min(opts->nr_poll_queues, num_online_cpus());
     nr_io_queues = nr_read_queues + nr_default_queues + nr_poll_queues;
 
     ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);
     if (ret)
         return ret;
 
     if (nr_io_queues == 0) {
         dev_err(ctrl->ctrl.device,
             "unable to set any I/O queues\n");
         return -ENOMEM;
     }
 
     ctrl->ctrl.queue_count = nr_io_queues + 1;
     dev_info(ctrl->ctrl.device,
         "creating %d I/O queues.\n", nr_io_queues);
 
     if (opts->nr_write_queues && nr_read_queues < nr_io_queues) {
         /*
          * separate read/write queues
          * hand out dedicated default queues only after we have
          * sufficient read queues.
          */
         ctrl->io_queues[HCTX_TYPE_READ] = nr_read_queues;
         nr_io_queues -= ctrl->io_queues[HCTX_TYPE_READ];
         ctrl->io_queues[HCTX_TYPE_DEFAULT] =
             min(nr_default_queues, nr_io_queues);
         nr_io_queues -= ctrl->io_queues[HCTX_TYPE_DEFAULT];
     } else {
         /*
          * shared read/write queues
          * either no write queues were requested, or we don't have
          * sufficient queue count to have dedicated default queues.
          */
         ctrl->io_queues[HCTX_TYPE_DEFAULT] =
             min(nr_read_queues, nr_io_queues);
         nr_io_queues -= ctrl->io_queues[HCTX_TYPE_DEFAULT];
     }
 
     if (opts->nr_poll_queues && nr_io_queues) {
         /* map dedicated poll queues only if we have queues left */
         ctrl->io_queues[HCTX_TYPE_POLL] =
             min(nr_poll_queues, nr_io_queues);
     }
 
     for (i = 1; i < ctrl->ctrl.queue_count; i++) {
         ret = nvme_rdma_alloc_queue(ctrl, i,
                 ctrl->ctrl.sqsize + 1);
         if (ret)
             goto out_free_queues;
     }
 
     return 0;
 
 out_free_queues:
     for (i--; i >= 1; i--)
         nvme_rdma_free_queue(&ctrl->queues[i]);
 
     return ret;
 }
 
 static int nvme_rdma_alloc_admin_tag_set(struct nvme_ctrl *nctrl)
 {
     struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
     struct blk_mq_tag_set *set = &ctrl->admin_tag_set;
     int ret;
 
     memset(set, 0, sizeof(*set));
     set->ops = &nvme_rdma_admin_mq_ops;
     set->queue_depth = NVME_AQ_MQ_TAG_DEPTH;
     set->reserved_tags = NVMF_RESERVED_TAGS;
     set->numa_node = nctrl->numa_node;
     set->cmd_size = sizeof(struct nvme_rdma_request) +
             NVME_RDMA_DATA_SGL_SIZE;
     set->driver_data = ctrl;
     set->nr_hw_queues = 1;
     set->timeout = NVME_ADMIN_TIMEOUT;
     set->flags = BLK_MQ_F_NO_SCHED;
     ret = blk_mq_alloc_tag_set(set);
     if (!ret)
         ctrl->ctrl.admin_tagset = set;
     return ret;
 }
 
 static int nvme_rdma_alloc_tag_set(struct nvme_ctrl *nctrl)
 {
     struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
     struct blk_mq_tag_set *set = &ctrl->tag_set;
     int ret;
 
     memset(set, 0, sizeof(*set));
     set->ops = &nvme_rdma_mq_ops;
     set->queue_depth = nctrl->sqsize + 1;
     set->reserved_tags = NVMF_RESERVED_TAGS;
     set->numa_node = nctrl->numa_node;
     set->flags = BLK_MQ_F_SHOULD_MERGE;
     set->cmd_size = sizeof(struct nvme_rdma_request) +
             NVME_RDMA_DATA_SGL_SIZE;
     if (nctrl->max_integrity_segments)
         set->cmd_size += sizeof(struct nvme_rdma_sgl) +
                  NVME_RDMA_METADATA_SGL_SIZE;
     set->driver_data = ctrl;
     set->nr_hw_queues = nctrl->queue_count - 1;
     set->timeout = NVME_IO_TIMEOUT;
     set->nr_maps = nctrl->opts->nr_poll_queues ? HCTX_MAX_TYPES : 2;
     ret = blk_mq_alloc_tag_set(set);
     if (!ret)
         ctrl->ctrl.tagset = set;
     return ret;
 }
 
 static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl,
         bool remove)
 {
     if (remove) {
         blk_mq_destroy_queue(ctrl->ctrl.admin_q);
         blk_mq_destroy_queue(ctrl->ctrl.fabrics_q);
         blk_mq_free_tag_set(ctrl->ctrl.admin_tagset);
     }
     if (ctrl->async_event_sqe.data) {
         cancel_work_sync(&ctrl->ctrl.async_event_work);
         nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,
                 sizeof(struct nvme_command), DMA_TO_DEVICE);
         ctrl->async_event_sqe.data = NULL;
     }
     nvme_rdma_free_queue(&ctrl->queues[0]);
 }
 
 static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl,
         bool new)
 {
     bool pi_capable = false;
     int error;
 
     error = nvme_rdma_alloc_queue(ctrl, 0, NVME_AQ_DEPTH);
     if (error)
         return error;
 
     ctrl->device = ctrl->queues[0].device;
     ctrl->ctrl.numa_node = ibdev_to_node(ctrl->device->dev);
 
     /* T10-PI support */
     if (ctrl->device->dev->attrs.kernel_cap_flags &
         IBK_INTEGRITY_HANDOVER)
         pi_capable = true;
 
     ctrl->max_fr_pages = nvme_rdma_get_max_fr_pages(ctrl->device->dev,
                             pi_capable);
 
     /*
      * Bind the async event SQE DMA mapping to the admin queue lifetime.
      * It's safe, since any chage in the underlying RDMA device will issue
      * error recovery and queue re-creation.
      */
     error = nvme_rdma_alloc_qe(ctrl->device->dev, &ctrl->async_event_sqe,
             sizeof(struct nvme_command), DMA_TO_DEVICE);
     if (error)
         goto out_free_queue;
 
     if (new) {
         error = nvme_rdma_alloc_admin_tag_set(&ctrl->ctrl);
         if (error)
             goto out_free_async_qe;
 
         ctrl->ctrl.fabrics_q = blk_mq_init_queue(&ctrl->admin_tag_set);
         if (IS_ERR(ctrl->ctrl.fabrics_q)) {
             error = PTR_ERR(ctrl->ctrl.fabrics_q);
             goto out_free_tagset;
         }
 
         ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
         if (IS_ERR(ctrl->ctrl.admin_q)) {
             error = PTR_ERR(ctrl->ctrl.admin_q);
             goto out_cleanup_fabrics_q;
         }
     }
 
     error = nvme_rdma_start_queue(ctrl, 0);
     if (error)
         goto out_cleanup_queue;
 
     error = nvme_enable_ctrl(&ctrl->ctrl);
     if (error)
         goto out_stop_queue;
 
     ctrl->ctrl.max_segments = ctrl->max_fr_pages;
     ctrl->ctrl.max_hw_sectors = ctrl->max_fr_pages << (ilog2(SZ_4K) - 9);
     if (pi_capable)
         ctrl->ctrl.max_integrity_segments = ctrl->max_fr_pages;
     else
         ctrl->ctrl.max_integrity_segments = 0;
 
     nvme_start_admin_queue(&ctrl->ctrl);
 
     error = nvme_init_ctrl_finish(&ctrl->ctrl);
     if (error)
         goto out_quiesce_queue;
 
     return 0;
 
 out_quiesce_queue:
     nvme_stop_admin_queue(&ctrl->ctrl);
     blk_sync_queue(ctrl->ctrl.admin_q);
 out_stop_queue:
     nvme_rdma_stop_queue(&ctrl->queues[0]);
     nvme_cancel_admin_tagset(&ctrl->ctrl);
 out_cleanup_queue:
     if (new)
         blk_mq_destroy_queue(ctrl->ctrl.admin_q);
 out_cleanup_fabrics_q:
     if (new)
         blk_mq_destroy_queue(ctrl->ctrl.fabrics_q);
 out_free_tagset:
     if (new)
         blk_mq_free_tag_set(ctrl->ctrl.admin_tagset);
 out_free_async_qe:
     if (ctrl->async_event_sqe.data) {
         nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,
             sizeof(struct nvme_command), DMA_TO_DEVICE);
         ctrl->async_event_sqe.data = NULL;
     }
 out_free_queue:
     nvme_rdma_free_queue(&ctrl->queues[0]);
     return error;
 }
 
 static void nvme_rdma_destroy_io_queues(struct nvme_rdma_ctrl *ctrl,
         bool remove)
 {
     if (remove) {
         blk_mq_destroy_queue(ctrl->ctrl.connect_q);
         blk_mq_free_tag_set(ctrl->ctrl.tagset);
     }
     nvme_rdma_free_io_queues(ctrl);
 }
 
 static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new)
 {
     int ret;
 
     ret = nvme_rdma_alloc_io_queues(ctrl);
     if (ret)
         return ret;
 
     if (new) {
         ret = nvme_rdma_alloc_tag_set(&ctrl->ctrl);
         if (ret)
             goto out_free_io_queues;
 
         ret = nvme_ctrl_init_connect_q(&(ctrl->ctrl));
         if (ret)
             goto out_free_tag_set;
     }
 
     ret = nvme_rdma_start_io_queues(ctrl);
     if (ret)
         goto out_cleanup_connect_q;
 
     if (!new) {
         nvme_start_queues(&ctrl->ctrl);
         if (!nvme_wait_freeze_timeout(&ctrl->ctrl, NVME_IO_TIMEOUT)) {
             /*
              * If we timed out waiting for freeze we are likely to
              * be stuck.  Fail the controller initialization just
              * to be safe.
              */
             ret = -ENODEV;
             goto out_wait_freeze_timed_out;
         }
         blk_mq_update_nr_hw_queues(ctrl->ctrl.tagset,
             ctrl->ctrl.queue_count - 1);
         nvme_unfreeze(&ctrl->ctrl);
     }
 
     return 0;
 
 out_wait_freeze_timed_out:
     nvme_stop_queues(&ctrl->ctrl);
     nvme_sync_io_queues(&ctrl->ctrl);
     nvme_rdma_stop_io_queues(ctrl);
 out_cleanup_connect_q:
     nvme_cancel_tagset(&ctrl->ctrl);
     if (new)
         blk_mq_destroy_queue(ctrl->ctrl.connect_q);
 out_free_tag_set:
     if (new)
         blk_mq_free_tag_set(ctrl->ctrl.tagset);
 out_free_io_queues:
     nvme_rdma_free_io_queues(ctrl);
     return ret;
 }
 
 static void nvme_rdma_teardown_admin_queue(struct nvme_rdma_ctrl *ctrl,
         bool remove)
 {
     nvme_stop_admin_queue(&ctrl->ctrl);
     blk_sync_queue(ctrl->ctrl.admin_q);
     nvme_rdma_stop_queue(&ctrl->queues[0]);
     nvme_cancel_admin_tagset(&ctrl->ctrl);
     if (remove)
         nvme_start_admin_queue(&ctrl->ctrl);
     nvme_rdma_destroy_admin_queue(ctrl, remove);
 }
 
 static void nvme_rdma_teardown_io_queues(struct nvme_rdma_ctrl *ctrl,
         bool remove)
 {
     if (ctrl->ctrl.queue_count > 1) {
         nvme_start_freeze(&ctrl->ctrl);
         nvme_stop_queues(&ctrl->ctrl);
         nvme_sync_io_queues(&ctrl->ctrl);
         nvme_rdma_stop_io_queues(ctrl);
         nvme_cancel_tagset(&ctrl->ctrl);
         if (remove)
             nvme_start_queues(&ctrl->ctrl);
         nvme_rdma_destroy_io_queues(ctrl, remove);
     }
 }
 
 static void nvme_rdma_stop_ctrl(struct nvme_ctrl *nctrl)
 {
     struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
 
     cancel_work_sync(&ctrl->err_work);
     cancel_delayed_work_sync(&ctrl->reconnect_work);
 }
 
 static void nvme_rdma_free_ctrl(struct nvme_ctrl *nctrl)
 {
     struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
 
     if (list_empty(&ctrl->list))
         goto free_ctrl;
 
     mutex_lock(&nvme_rdma_ctrl_mutex);
     list_del(&ctrl->list);
     mutex_unlock(&nvme_rdma_ctrl_mutex);
 
     nvmf_free_options(nctrl->opts);
 free_ctrl:
     kfree(ctrl->queues);
     kfree(ctrl);
 }
 
 static void nvme_rdma_reconnect_or_remove(struct nvme_rdma_ctrl *ctrl)
 {
     /* If we are resetting/deleting then do nothing */
     if (ctrl->ctrl.state != NVME_CTRL_CONNECTING) {
         WARN_ON_ONCE(ctrl->ctrl.state == NVME_CTRL_NEW ||
             ctrl->ctrl.state == NVME_CTRL_LIVE);
         return;
     }
 
     if (nvmf_should_reconnect(&ctrl->ctrl)) {
         dev_info(ctrl->ctrl.device, "Reconnecting in %d seconds...\n",
             ctrl->ctrl.opts->reconnect_delay);
         queue_delayed_work(nvme_wq, &ctrl->reconnect_work,
                 ctrl->ctrl.opts->reconnect_delay * HZ);
     } else {
         nvme_delete_ctrl(&ctrl->ctrl);
     }
 }
 
 static int nvme_rdma_setup_ctrl(struct nvme_rdma_ctrl *ctrl, bool new)
 {
     int ret;
     bool changed;
 
     ret = nvme_rdma_configure_admin_queue(ctrl, new);
     if (ret)
         return ret;
 
     if (ctrl->ctrl.icdoff) {
         ret = -EOPNOTSUPP;
         dev_err(ctrl->ctrl.device, "icdoff is not supported!\n");
         goto destroy_admin;
     }
 
     if (!(ctrl->ctrl.sgls & (1 << 2))) {
         ret = -EOPNOTSUPP;
         dev_err(ctrl->ctrl.device,
             "Mandatory keyed sgls are not supported!\n");
         goto destroy_admin;
     }
 
     if (ctrl->ctrl.opts->queue_size > ctrl->ctrl.sqsize + 1) {
         dev_warn(ctrl->ctrl.device,
             "queue_size %zu > ctrl sqsize %u, clamping down\n",
             ctrl->ctrl.opts->queue_size, ctrl->ctrl.sqsize + 1);
     }
 
     if (ctrl->ctrl.sqsize + 1 > NVME_RDMA_MAX_QUEUE_SIZE) {
         dev_warn(ctrl->ctrl.device,
             "ctrl sqsize %u > max queue size %u, clamping down\n",
             ctrl->ctrl.sqsize + 1, NVME_RDMA_MAX_QUEUE_SIZE);
         ctrl->ctrl.sqsize = NVME_RDMA_MAX_QUEUE_SIZE - 1;
     }
 
     if (ctrl->ctrl.sqsize + 1 > ctrl->ctrl.maxcmd) {
         dev_warn(ctrl->ctrl.device,
             "sqsize %u > ctrl maxcmd %u, clamping down\n",
             ctrl->ctrl.sqsize + 1, ctrl->ctrl.maxcmd);
         ctrl->ctrl.sqsize = ctrl->ctrl.maxcmd - 1;
     }
 
     if (ctrl->ctrl.sgls & (1 << 20))
         ctrl->use_inline_data = true;
 
     if (ctrl->ctrl.queue_count > 1) {
         ret = nvme_rdma_configure_io_queues(ctrl, new);
         if (ret)
             goto destroy_admin;
     }
 
     changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
     if (!changed) {
         /*
          * state change failure is ok if we started ctrl delete,
          * unless we're during creation of a new controller to
          * avoid races with teardown flow.
          */
         WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING &&
                  ctrl->ctrl.state != NVME_CTRL_DELETING_NOIO);
         WARN_ON_ONCE(new);
         ret = -EINVAL;
         goto destroy_io;
     }
 
     nvme_start_ctrl(&ctrl->ctrl);
     return 0;
 
 destroy_io:
     if (ctrl->ctrl.queue_count > 1) {
         nvme_stop_queues(&ctrl->ctrl);
         nvme_sync_io_queues(&ctrl->ctrl);
         nvme_rdma_stop_io_queues(ctrl);
         nvme_cancel_tagset(&ctrl->ctrl);
         nvme_rdma_destroy_io_queues(ctrl, new);
     }
 destroy_admin:
     nvme_stop_admin_queue(&ctrl->ctrl);
     blk_sync_queue(ctrl->ctrl.admin_q);
     nvme_rdma_stop_queue(&ctrl->queues[0]);
     nvme_cancel_admin_tagset(&ctrl->ctrl);
     nvme_rdma_destroy_admin_queue(ctrl, new);
     return ret;
 }
 
 static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work)
 {
     struct nvme_rdma_ctrl *ctrl = container_of(to_delayed_work(work),
             struct nvme_rdma_ctrl, reconnect_work);
 
     ++ctrl->ctrl.nr_reconnects;
 
     if (nvme_rdma_setup_ctrl(ctrl, false))
         goto requeue;
 
     dev_info(ctrl->ctrl.device, "Successfully reconnected (%d attempts)\n",
             ctrl->ctrl.nr_reconnects);
 
     ctrl->ctrl.nr_reconnects = 0;
 
     return;
 
 requeue:
     dev_info(ctrl->ctrl.device, "Failed reconnect attempt %d\n",
             ctrl->ctrl.nr_reconnects);
     nvme_rdma_reconnect_or_remove(ctrl);
 }
 
 static void nvme_rdma_error_recovery_work(struct work_struct *work)
 {
     struct nvme_rdma_ctrl *ctrl = container_of(work,
             struct nvme_rdma_ctrl, err_work);
 
     nvme_auth_stop(&ctrl->ctrl);
     nvme_stop_keep_alive(&ctrl->ctrl);
     flush_work(&ctrl->ctrl.async_event_work);
     nvme_rdma_teardown_io_queues(ctrl, false);
     nvme_start_queues(&ctrl->ctrl);
     nvme_rdma_teardown_admin_queue(ctrl, false);
     nvme_start_admin_queue(&ctrl->ctrl);
 
     if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
         /* state change failure is ok if we started ctrl delete */
         WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING &&
                  ctrl->ctrl.state != NVME_CTRL_DELETING_NOIO);
         return;
     }
 
     nvme_rdma_reconnect_or_remove(ctrl);
 }
 
 static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl *ctrl)
 {
     if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING))
         return;
 
     dev_warn(ctrl->ctrl.device, "starting error recovery\n");
     queue_work(nvme_reset_wq, &ctrl->err_work);
 }
 
 static void nvme_rdma_end_request(struct nvme_rdma_request *req)
 {
     struct request *rq = blk_mq_rq_from_pdu(req);
 
     if (!refcount_dec_and_test(&req->ref))
         return;
     if (!nvme_try_complete_req(rq, req->status, req->result))
         nvme_rdma_complete_rq(rq);
 }
 
 static void nvme_rdma_wr_error(struct ib_cq *cq, struct ib_wc *wc,
         const char *op)
 {
     struct nvme_rdma_queue *queue = wc->qp->qp_context;
     struct nvme_rdma_ctrl *ctrl = queue->ctrl;
 
     if (ctrl->ctrl.state == NVME_CTRL_LIVE)
         dev_info(ctrl->ctrl.device,
                  "%s for CQE 0x%p failed with status %s (%d)\n",
                  op, wc->wr_cqe,
                  ib_wc_status_msg(wc->status), wc->status);
     nvme_rdma_error_recovery(ctrl);
 }
 
 static void nvme_rdma_memreg_done(struct ib_cq *cq, struct ib_wc *wc)
 {
     if (unlikely(wc->status != IB_WC_SUCCESS))
         nvme_rdma_wr_error(cq, wc, "MEMREG");
 }
 
 static void nvme_rdma_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc)
 {
     struct nvme_rdma_request *req =
         container_of(wc->wr_cqe, struct nvme_rdma_request, reg_cqe);
 
     if (unlikely(wc->status != IB_WC_SUCCESS))
         nvme_rdma_wr_error(cq, wc, "LOCAL_INV");
     else
         nvme_rdma_end_request(req);
 }
 
 static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue,
         struct nvme_rdma_request *req)
 {
     struct ib_send_wr wr = {
         .opcode         = IB_WR_LOCAL_INV,
         .next           = NULL,
         .num_sge        = 0,
         .send_flags     = IB_SEND_SIGNALED,
         .ex.invalidate_rkey = req->mr->rkey,
     };
 
     req->reg_cqe.done = nvme_rdma_inv_rkey_done;
     wr.wr_cqe = &req->reg_cqe;
 
     return ib_post_send(queue->qp, &wr, NULL);
 }
 
 static void nvme_rdma_dma_unmap_req(struct ib_device *ibdev, struct request *rq)
 {
     struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
 
     if (blk_integrity_rq(rq)) {
         ib_dma_unmap_sg(ibdev, req->metadata_sgl->sg_table.sgl,
                 req->metadata_sgl->nents, rq_dma_dir(rq));
         sg_free_table_chained(&req->metadata_sgl->sg_table,
                       NVME_INLINE_METADATA_SG_CNT);
     }
 
     ib_dma_unmap_sg(ibdev, req->data_sgl.sg_table.sgl, req->data_sgl.nents,
             rq_dma_dir(rq));
     sg_free_table_chained(&req->data_sgl.sg_table, NVME_INLINE_SG_CNT);
 }
 
 static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue,
         struct request *rq)
 {
     struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
     struct nvme_rdma_device *dev = queue->device;
     struct ib_device *ibdev = dev->dev;
     struct list_head *pool = &queue->qp->rdma_mrs;
 
     if (!blk_rq_nr_phys_segments(rq))
         return;
 
     if (req->use_sig_mr)
         pool = &queue->qp->sig_mrs;
 
     if (req->mr) {
         ib_mr_pool_put(queue->qp, pool, req->mr);
         req->mr = NULL;
     }
 
     nvme_rdma_dma_unmap_req(ibdev, rq);
 }
 
 static int nvme_rdma_set_sg_null(struct nvme_command *c)
 {
     struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
 
     sg->addr = 0;
     put_unaligned_le24(0, sg->length);
     put_unaligned_le32(0, sg->key);
     sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
     return 0;
 }
 
 static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue *queue,
         struct nvme_rdma_request *req, struct nvme_command *c,
         int count)
 {
     struct nvme_sgl_desc *sg = &c->common.dptr.sgl;
     struct ib_sge *sge = &req->sge[1];
     struct scatterlist *sgl;
     u32 len = 0;
     int i;
 
     for_each_sg(req->data_sgl.sg_table.sgl, sgl, count, i) {
         sge->addr = sg_dma_address(sgl);
         sge->length = sg_dma_len(sgl);
         sge->lkey = queue->device->pd->local_dma_lkey;
         len += sge->length;
         sge++;
     }
 
     sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff);
     sg->length = cpu_to_le32(len);
     sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET;
 
     req->num_sge += count;
     return 0;
 }
 
 static int nvme_rdma_map_sg_single(struct nvme_rdma_queue *queue,
         struct nvme_rdma_request *req, struct nvme_command *c)
 {
     struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
 
     sg->addr = cpu_to_le64(sg_dma_address(req->data_sgl.sg_table.sgl));
     put_unaligned_le24(sg_dma_len(req->data_sgl.sg_table.sgl), sg->length);
     put_unaligned_le32(queue->device->pd->unsafe_global_rkey, sg->key);
     sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
     return 0;
 }
 
 static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue *queue,
         struct nvme_rdma_request *req, struct nvme_command *c,
         int count)
 {
     struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
     int nr;
 
     req->mr = ib_mr_pool_get(queue->qp, &queue->qp->rdma_mrs);
     if (WARN_ON_ONCE(!req->mr))
         return -EAGAIN;
 
     /*
      * Align the MR to a 4K page size to match the ctrl page size and
      * the block virtual boundary.
      */
     nr = ib_map_mr_sg(req->mr, req->data_sgl.sg_table.sgl, count, NULL,
               SZ_4K);
     if (unlikely(nr < count)) {
         ib_mr_pool_put(queue->qp, &queue->qp->rdma_mrs, req->mr);
         req->mr = NULL;
         if (nr < 0)
             return nr;
         return -EINVAL;
     }
 
     ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey));
 
     req->reg_cqe.done = nvme_rdma_memreg_done;
     memset(&req->reg_wr, 0, sizeof(req->reg_wr));
     req->reg_wr.wr.opcode = IB_WR_REG_MR;
     req->reg_wr.wr.wr_cqe = &req->reg_cqe;
     req->reg_wr.wr.num_sge = 0;
     req->reg_wr.mr = req->mr;
     req->reg_wr.key = req->mr->rkey;
     req->reg_wr.access = IB_ACCESS_LOCAL_WRITE |
                  IB_ACCESS_REMOTE_READ |
                  IB_ACCESS_REMOTE_WRITE;
 
     sg->addr = cpu_to_le64(req->mr->iova);
     put_unaligned_le24(req->mr->length, sg->length);
     put_unaligned_le32(req->mr->rkey, sg->key);
     sg->type = (NVME_KEY_SGL_FMT_DATA_DESC << 4) |
             NVME_SGL_FMT_INVALIDATE;
 
     return 0;
 }
 
 static void nvme_rdma_set_sig_domain(struct blk_integrity *bi,
         struct nvme_command *cmd, struct ib_sig_domain *domain,
         u16 control, u8 pi_type)
 {
     domain->sig_type = IB_SIG_TYPE_T10_DIF;
     domain->sig.dif.bg_type = IB_T10DIF_CRC;
     domain->sig.dif.pi_interval = 1 << bi->interval_exp;
     domain->sig.dif.ref_tag = le32_to_cpu(cmd->rw.reftag);
     if (control & NVME_RW_PRINFO_PRCHK_REF)
         domain->sig.dif.ref_remap = true;
 
     domain->sig.dif.app_tag = le16_to_cpu(cmd->rw.apptag);
     domain->sig.dif.apptag_check_mask = le16_to_cpu(cmd->rw.appmask);
     domain->sig.dif.app_escape = true;
     if (pi_type == NVME_NS_DPS_PI_TYPE3)
         domain->sig.dif.ref_escape = true;
 }
 
 static void nvme_rdma_set_sig_attrs(struct blk_integrity *bi,
         struct nvme_command *cmd, struct ib_sig_attrs *sig_attrs,
         u8 pi_type)
 {
     u16 control = le16_to_cpu(cmd->rw.control);
 
     memset(sig_attrs, 0, sizeof(*sig_attrs));
     if (control & NVME_RW_PRINFO_PRACT) {
         /* for WRITE_INSERT/READ_STRIP no memory domain */
         sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
         nvme_rdma_set_sig_domain(bi, cmd, &sig_attrs->wire, control,
                      pi_type);
         /* Clear the PRACT bit since HCA will generate/verify the PI */
         control &= ~NVME_RW_PRINFO_PRACT;
         cmd->rw.control = cpu_to_le16(control);
     } else {
         /* for WRITE_PASS/READ_PASS both wire/memory domains exist */
         nvme_rdma_set_sig_domain(bi, cmd, &sig_attrs->wire, control,
                      pi_type);
         nvme_rdma_set_sig_domain(bi, cmd, &sig_attrs->mem, control,
                      pi_type);
     }
 }
 
 static void nvme_rdma_set_prot_checks(struct nvme_command *cmd, u8 *mask)
 {
     *mask = 0;
     if (le16_to_cpu(cmd->rw.control) & NVME_RW_PRINFO_PRCHK_REF)
         *mask |= IB_SIG_CHECK_REFTAG;
     if (le16_to_cpu(cmd->rw.control) & NVME_RW_PRINFO_PRCHK_GUARD)
         *mask |= IB_SIG_CHECK_GUARD;
 }
 
 static void nvme_rdma_sig_done(struct ib_cq *cq, struct ib_wc *wc)
 {
     if (unlikely(wc->status != IB_WC_SUCCESS))
         nvme_rdma_wr_error(cq, wc, "SIG");
 }
 
 static int nvme_rdma_map_sg_pi(struct nvme_rdma_queue *queue,
         struct nvme_rdma_request *req, struct nvme_command *c,
         int count, int pi_count)
 {
     struct nvme_rdma_sgl *sgl = &req->data_sgl;
     struct ib_reg_wr *wr = &req->reg_wr;
     struct request *rq = blk_mq_rq_from_pdu(req);
     struct nvme_ns *ns = rq->q->queuedata;
     struct bio *bio = rq->bio;
     struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
     int nr;
 
     req->mr = ib_mr_pool_get(queue->qp, &queue->qp->sig_mrs);
     if (WARN_ON_ONCE(!req->mr))
         return -EAGAIN;
 
     nr = ib_map_mr_sg_pi(req->mr, sgl->sg_table.sgl, count, NULL,
                  req->metadata_sgl->sg_table.sgl, pi_count, NULL,
                  SZ_4K);
     if (unlikely(nr))
         goto mr_put;
 
     nvme_rdma_set_sig_attrs(blk_get_integrity(bio->bi_bdev->bd_disk), c,
                 req->mr->sig_attrs, ns->pi_type);
     nvme_rdma_set_prot_checks(c, &req->mr->sig_attrs->check_mask);
 
     ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey));
 
     req->reg_cqe.done = nvme_rdma_sig_done;
     memset(wr, 0, sizeof(*wr));
     wr->wr.opcode = IB_WR_REG_MR_INTEGRITY;
     wr->wr.wr_cqe = &req->reg_cqe;
     wr->wr.num_sge = 0;
     wr->wr.send_flags = 0;
     wr->mr = req->mr;
     wr->key = req->mr->rkey;
     wr->access = IB_ACCESS_LOCAL_WRITE |
              IB_ACCESS_REMOTE_READ |
              IB_ACCESS_REMOTE_WRITE;
 
     sg->addr = cpu_to_le64(req->mr->iova);
     put_unaligned_le24(req->mr->length, sg->length);
     put_unaligned_le32(req->mr->rkey, sg->key);
     sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
 
     return 0;
 
 mr_put:
     ib_mr_pool_put(queue->qp, &queue->qp->sig_mrs, req->mr);
     req->mr = NULL;
     if (nr < 0)
         return nr;
     return -EINVAL;
 }
 
 static int nvme_rdma_dma_map_req(struct ib_device *ibdev, struct request *rq,
         int *count, int *pi_count)
 {
     struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
     int ret;
 
     req->data_sgl.sg_table.sgl = (struct scatterlist *)(req + 1);
     ret = sg_alloc_table_chained(&req->data_sgl.sg_table,
             blk_rq_nr_phys_segments(rq), req->data_sgl.sg_table.sgl,
             NVME_INLINE_SG_CNT);
     if (ret)
         return -ENOMEM;
 
     req->data_sgl.nents = blk_rq_map_sg(rq->q, rq,
                         req->data_sgl.sg_table.sgl);
 
     *count = ib_dma_map_sg(ibdev, req->data_sgl.sg_table.sgl,
                    req->data_sgl.nents, rq_dma_dir(rq));
     if (unlikely(*count <= 0)) {
         ret = -EIO;
         goto out_free_table;
     }
 
     if (blk_integrity_rq(rq)) {
         req->metadata_sgl->sg_table.sgl =
             (struct scatterlist *)(req->metadata_sgl + 1);
         ret = sg_alloc_table_chained(&req->metadata_sgl->sg_table,
                 blk_rq_count_integrity_sg(rq->q, rq->bio),
                 req->metadata_sgl->sg_table.sgl,
                 NVME_INLINE_METADATA_SG_CNT);
         if (unlikely(ret)) {
             ret = -ENOMEM;
             goto out_unmap_sg;
         }
 
         req->metadata_sgl->nents = blk_rq_map_integrity_sg(rq->q,
                 rq->bio, req->metadata_sgl->sg_table.sgl);
         *pi_count = ib_dma_map_sg(ibdev,
                       req->metadata_sgl->sg_table.sgl,
                       req->metadata_sgl->nents,
                       rq_dma_dir(rq));
         if (unlikely(*pi_count <= 0)) {
             ret = -EIO;
             goto out_free_pi_table;
         }
     }
 
     return 0;
 
 out_free_pi_table:
     sg_free_table_chained(&req->metadata_sgl->sg_table,
                   NVME_INLINE_METADATA_SG_CNT);
 out_unmap_sg:
     ib_dma_unmap_sg(ibdev, req->data_sgl.sg_table.sgl, req->data_sgl.nents,
             rq_dma_dir(rq));
 out_free_table:
     sg_free_table_chained(&req->data_sgl.sg_table, NVME_INLINE_SG_CNT);
     return ret;
 }
 
 static int nvme_rdma_map_data(struct nvme_rdma_queue *queue,
         struct request *rq, struct nvme_command *c)
 {
     struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
     struct nvme_rdma_device *dev = queue->device;
     struct ib_device *ibdev = dev->dev;
     int pi_count = 0;
     int count, ret;
 
     req->num_sge = 1;
     refcount_set(&req->ref, 2); /* send and recv completions */
 
     c->common.flags |= NVME_CMD_SGL_METABUF;
 
     if (!blk_rq_nr_phys_segments(rq))
         return nvme_rdma_set_sg_null(c);
 
     ret = nvme_rdma_dma_map_req(ibdev, rq, &count, &pi_count);
     if (unlikely(ret))
         return ret;
 
     if (req->use_sig_mr) {
         ret = nvme_rdma_map_sg_pi(queue, req, c, count, pi_count);
         goto out;
     }
 
     if (count <= dev->num_inline_segments) {
         if (rq_data_dir(rq) == WRITE && nvme_rdma_queue_idx(queue) &&
             queue->ctrl->use_inline_data &&
             blk_rq_payload_bytes(rq) <=
                 nvme_rdma_inline_data_size(queue)) {
             ret = nvme_rdma_map_sg_inline(queue, req, c, count);
             goto out;
         }
 
         if (count == 1 && dev->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY) {
             ret = nvme_rdma_map_sg_single(queue, req, c);
             goto out;
         }
     }
 
     ret = nvme_rdma_map_sg_fr(queue, req, c, count);
 out:
     if (unlikely(ret))
         goto out_dma_unmap_req;
 
     return 0;
 
 out_dma_unmap_req:
     nvme_rdma_dma_unmap_req(ibdev, rq);
     return ret;
 }
 
 static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
 {
     struct nvme_rdma_qe *qe =
         container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
     struct nvme_rdma_request *req =
         container_of(qe, struct nvme_rdma_request, sqe);
 
     if (unlikely(wc->status != IB_WC_SUCCESS))
         nvme_rdma_wr_error(cq, wc, "SEND");
     else
         nvme_rdma_end_request(req);
 }
 
 static int nvme_rdma_post_send(struct nvme_rdma_queue *queue,
         struct nvme_rdma_qe *qe, struct ib_sge *sge, u32 num_sge,
         struct ib_send_wr *first)
 {
     struct ib_send_wr wr;
     int ret;
 
     sge->addr   = qe->dma;
     sge->length = sizeof(struct nvme_command);
     sge->lkey   = queue->device->pd->local_dma_lkey;
 
     wr.next       = NULL;
     wr.wr_cqe     = &qe->cqe;
     wr.sg_list    = sge;
     wr.num_sge    = num_sge;
     wr.opcode     = IB_WR_SEND;
     wr.send_flags = IB_SEND_SIGNALED;
 
     if (first)
         first->next = &wr;
     else
         first = &wr;
 
     ret = ib_post_send(queue->qp, first, NULL);
     if (unlikely(ret)) {
         dev_err(queue->ctrl->ctrl.device,
                  "%s failed with error code %d\n", __func__, ret);
     }
     return ret;
 }
 
 static int nvme_rdma_post_recv(struct nvme_rdma_queue *queue,
         struct nvme_rdma_qe *qe)
 {
     struct ib_recv_wr wr;
     struct ib_sge list;
     int ret;
 
     list.addr   = qe->dma;
     list.length = sizeof(struct nvme_completion);
     list.lkey   = queue->device->pd->local_dma_lkey;
 
     qe->cqe.done = nvme_rdma_recv_done;
 
     wr.next     = NULL;
     wr.wr_cqe   = &qe->cqe;
     wr.sg_list  = &list;
     wr.num_sge  = 1;
 
     ret = ib_post_recv(queue->qp, &wr, NULL);
     if (unlikely(ret)) {
         dev_err(queue->ctrl->ctrl.device,
             "%s failed with error code %d\n", __func__, ret);
     }
     return ret;
 }
 
 static struct blk_mq_tags *nvme_rdma_tagset(struct nvme_rdma_queue *queue)
 {
     u32 queue_idx = nvme_rdma_queue_idx(queue);
 
     if (queue_idx == 0)
         return queue->ctrl->admin_tag_set.tags[queue_idx];
     return queue->ctrl->tag_set.tags[queue_idx - 1];
 }
 
 static void nvme_rdma_async_done(struct ib_cq *cq, struct ib_wc *wc)
 {
     if (unlikely(wc->status != IB_WC_SUCCESS))
         nvme_rdma_wr_error(cq, wc, "ASYNC");
 }
 
 static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg)
 {
     struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(arg);
     struct nvme_rdma_queue *queue = &ctrl->queues[0];
     struct ib_device *dev = queue->device->dev;
     struct nvme_rdma_qe *sqe = &ctrl->async_event_sqe;
     struct nvme_command *cmd = sqe->data;
     struct ib_sge sge;
     int ret;
 
     ib_dma_sync_single_for_cpu(dev, sqe->dma, sizeof(*cmd), DMA_TO_DEVICE);
 
     memset(cmd, 0, sizeof(*cmd));
     cmd->common.opcode = nvme_admin_async_event;
     cmd->common.command_id = NVME_AQ_BLK_MQ_DEPTH;
     cmd->common.flags |= NVME_CMD_SGL_METABUF;
     nvme_rdma_set_sg_null(cmd);
 
     sqe->cqe.done = nvme_rdma_async_done;
 
     ib_dma_sync_single_for_device(dev, sqe->dma, sizeof(*cmd),
             DMA_TO_DEVICE);
 
     ret = nvme_rdma_post_send(queue, sqe, &sge, 1, NULL);
     WARN_ON_ONCE(ret);
 }
 
 static void nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue,
         struct nvme_completion *cqe, struct ib_wc *wc)
 {
     struct request *rq;
     struct nvme_rdma_request *req;
 
     rq = nvme_find_rq(nvme_rdma_tagset(queue), cqe->command_id);
     if (!rq) {
         dev_err(queue->ctrl->ctrl.device,
             "got bad command_id %#x on QP %#x\n",
             cqe->command_id, queue->qp->qp_num);
         nvme_rdma_error_recovery(queue->ctrl);
         return;
     }
     req = blk_mq_rq_to_pdu(rq);
 
     req->status = cqe->status;
     req->result = cqe->result;
 
     if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
         if (unlikely(!req->mr ||
                  wc->ex.invalidate_rkey != req->mr->rkey)) {
             dev_err(queue->ctrl->ctrl.device,
                 "Bogus remote invalidation for rkey %#x\n",
                 req->mr ? req->mr->rkey : 0);
             nvme_rdma_error_recovery(queue->ctrl);
         }
     } else if (req->mr) {
         int ret;
 
         ret = nvme_rdma_inv_rkey(queue, req);
         if (unlikely(ret < 0)) {
             dev_err(queue->ctrl->ctrl.device,
                 "Queueing INV WR for rkey %#x failed (%d)\n",
                 req->mr->rkey, ret);
             nvme_rdma_error_recovery(queue->ctrl);
         }
         /* the local invalidation completion will end the request */
         return;
     }
 
     nvme_rdma_end_request(req);
 }
 
 static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
 {
     struct nvme_rdma_qe *qe =
         container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
     struct nvme_rdma_queue *queue = wc->qp->qp_context;
     struct ib_device *ibdev = queue->device->dev;
     struct nvme_completion *cqe = qe->data;
     const size_t len = sizeof(struct nvme_completion);
 
     if (unlikely(wc->status != IB_WC_SUCCESS)) {
         nvme_rdma_wr_error(cq, wc, "RECV");
         return;
     }
 
     /* sanity checking for received data length */
     if (unlikely(wc->byte_len < len)) {
         dev_err(queue->ctrl->ctrl.device,
             "Unexpected nvme completion length(%d)\n", wc->byte_len);
         nvme_rdma_error_recovery(queue->ctrl);
         return;
     }
 
     ib_dma_sync_single_for_cpu(ibdev, qe->dma, len, DMA_FROM_DEVICE);
     /*
      * AEN requests are special as they don't time out and can
      * survive any kind of queue freeze and often don't respond to
      * aborts.  We don't even bother to allocate a struct request
      * for them but rather special case them here.
      */
     if (unlikely(nvme_is_aen_req(nvme_rdma_queue_idx(queue),
                      cqe->command_id)))
         nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
                 &cqe->result);
     else
         nvme_rdma_process_nvme_rsp(queue, cqe, wc);
     ib_dma_sync_single_for_device(ibdev, qe->dma, len, DMA_FROM_DEVICE);
 
     nvme_rdma_post_recv(queue, qe);
 }
 
 static int nvme_rdma_conn_established(struct nvme_rdma_queue *queue)
 {
     int ret, i;
 
     for (i = 0; i < queue->queue_size; i++) {
         ret = nvme_rdma_post_recv(queue, &queue->rsp_ring[i]);
         if (ret)
             return ret;
     }
 
     return 0;
 }
 
 static int nvme_rdma_conn_rejected(struct nvme_rdma_queue *queue,
         struct rdma_cm_event *ev)
 {
     struct rdma_cm_id *cm_id = queue->cm_id;
     int status = ev->status;
     const char *rej_msg;
     const struct nvme_rdma_cm_rej *rej_data;
     u8 rej_data_len;
 
     rej_msg = rdma_reject_msg(cm_id, status);
     rej_data = rdma_consumer_reject_data(cm_id, ev, &rej_data_len);
 
     if (rej_data && rej_data_len >= sizeof(u16)) {
         u16 sts = le16_to_cpu(rej_data->sts);
 
         dev_err(queue->ctrl->ctrl.device,
               "Connect rejected: status %d (%s) nvme status %d (%s).\n",
               status, rej_msg, sts, nvme_rdma_cm_msg(sts));
     } else {
         dev_err(queue->ctrl->ctrl.device,
             "Connect rejected: status %d (%s).\n", status, rej_msg);
     }
 
     return -ECONNRESET;
 }
 
 static int nvme_rdma_addr_resolved(struct nvme_rdma_queue *queue)
 {
     struct nvme_ctrl *ctrl = &queue->ctrl->ctrl;
     int ret;
 
     ret = nvme_rdma_create_queue_ib(queue);
     if (ret)
         return ret;
 
     if (ctrl->opts->tos >= 0)
         rdma_set_service_type(queue->cm_id, ctrl->opts->tos);
     ret = rdma_resolve_route(queue->cm_id, NVME_RDMA_CM_TIMEOUT_MS);
     if (ret) {
         dev_err(ctrl->device, "rdma_resolve_route failed (%d).\n",
             queue->cm_error);
         goto out_destroy_queue;
     }
 
     return 0;
 
 out_destroy_queue:
     nvme_rdma_destroy_queue_ib(queue);
     return ret;
 }
 
 static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue)
 {
     struct nvme_rdma_ctrl *ctrl = queue->ctrl;
     struct rdma_conn_param param = { };
     struct nvme_rdma_cm_req priv = { };
     int ret;
 
     param.qp_num = queue->qp->qp_num;
     param.flow_control = 1;
 
     param.responder_resources = queue->device->dev->attrs.max_qp_rd_atom;
     /* maximum retry count */
     param.retry_count = 7;
     param.rnr_retry_count = 7;
     param.private_data = &priv;
     param.private_data_len = sizeof(priv);
 
     priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
     priv.qid = cpu_to_le16(nvme_rdma_queue_idx(queue));
     /*
      * set the admin queue depth to the minimum size
      * specified by the Fabrics standard.
      */
     if (priv.qid == 0) {
         priv.hrqsize = cpu_to_le16(NVME_AQ_DEPTH);
         priv.hsqsize = cpu_to_le16(NVME_AQ_DEPTH - 1);
     } else {
         /*
          * current interpretation of the fabrics spec
          * is at minimum you make hrqsize sqsize+1, or a
          * 1's based representation of sqsize.
          */
         priv.hrqsize = cpu_to_le16(queue->queue_size);
         priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize);
     }
 
     ret = rdma_connect_locked(queue->cm_id, &param);
     if (ret) {
         dev_err(ctrl->ctrl.device,
             "rdma_connect_locked failed (%d).\n", ret);
         return ret;
     }
 
     return 0;
 }
 
 static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
         struct rdma_cm_event *ev)
 {
     struct nvme_rdma_queue *queue = cm_id->context;
     int cm_error = 0;
 
     dev_dbg(queue->ctrl->ctrl.device, "%s (%d): status %d id %p\n",
         rdma_event_msg(ev->event), ev->event,
         ev->status, cm_id);
 
     switch (ev->event) {
     case RDMA_CM_EVENT_ADDR_RESOLVED:
         cm_error = nvme_rdma_addr_resolved(queue);
         break;
     case RDMA_CM_EVENT_ROUTE_RESOLVED:
         cm_error = nvme_rdma_route_resolved(queue);
         break;
     case RDMA_CM_EVENT_ESTABLISHED:
         queue->cm_error = nvme_rdma_conn_established(queue);
         /* complete cm_done regardless of success/failure */
         complete(&queue->cm_done);
         return 0;
     case RDMA_CM_EVENT_REJECTED:
         cm_error = nvme_rdma_conn_rejected(queue, ev);
         break;
     case RDMA_CM_EVENT_ROUTE_ERROR:
     case RDMA_CM_EVENT_CONNECT_ERROR:
     case RDMA_CM_EVENT_UNREACHABLE:
     case RDMA_CM_EVENT_ADDR_ERROR:
         dev_dbg(queue->ctrl->ctrl.device,
             "CM error event %d\n", ev->event);
         cm_error = -ECONNRESET;
         break;
     case RDMA_CM_EVENT_DISCONNECTED:
     case RDMA_CM_EVENT_ADDR_CHANGE:
     case RDMA_CM_EVENT_TIMEWAIT_EXIT:
         dev_dbg(queue->ctrl->ctrl.device,
             "disconnect received - connection closed\n");
         nvme_rdma_error_recovery(queue->ctrl);
         break;
     case RDMA_CM_EVENT_DEVICE_REMOVAL:
         /* device removal is handled via the ib_client API */
         break;
     default:
         dev_err(queue->ctrl->ctrl.device,
             "Unexpected RDMA CM event (%d)\n", ev->event);
         nvme_rdma_error_recovery(queue->ctrl);
         break;
     }
 
     if (cm_error) {
         queue->cm_error = cm_error;
         complete(&queue->cm_done);
     }
 
     return 0;
 }
 
 static void nvme_rdma_complete_timed_out(struct request *rq)
 {
     struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
     struct nvme_rdma_queue *queue = req->queue;
 
     nvme_rdma_stop_queue(queue);
     nvmf_complete_timed_out_request(rq);
 }
 
 static enum blk_eh_timer_return nvme_rdma_timeout(struct request *rq)
 {
     struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
     struct nvme_rdma_queue *queue = req->queue;
     struct nvme_rdma_ctrl *ctrl = queue->ctrl;
 
     dev_warn(ctrl->ctrl.device, "I/O %d QID %d timeout\n",
          rq->tag, nvme_rdma_queue_idx(queue));
 
     if (ctrl->ctrl.state != NVME_CTRL_LIVE) {
         /*
          * If we are resetting, connecting or deleting we should
          * complete immediately because we may block controller
          * teardown or setup sequence
          * - ctrl disable/shutdown fabrics requests
          * - connect requests
          * - initialization admin requests
          * - I/O requests that entered after unquiescing and
          *   the controller stopped responding
          *
          * All other requests should be cancelled by the error
          * recovery work, so it's fine that we fail it here.
          */
         nvme_rdma_complete_timed_out(rq);
         return BLK_EH_DONE;
     }
 
     /*
      * LIVE state should trigger the normal error recovery which will
      * handle completing this request.
      */
     nvme_rdma_error_recovery(ctrl);
     return BLK_EH_RESET_TIMER;
 }
 
 static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
         const struct blk_mq_queue_data *bd)
 {
     struct nvme_ns *ns = hctx->queue->queuedata;
     struct nvme_rdma_queue *queue = hctx->driver_data;
     struct request *rq = bd->rq;
     struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
     struct nvme_rdma_qe *sqe = &req->sqe;
     struct nvme_command *c = nvme_req(rq)->cmd;
     struct ib_device *dev;
     bool queue_ready = test_bit(NVME_RDMA_Q_LIVE, &queue->flags);
     blk_status_t ret;
     int err;
 
     WARN_ON_ONCE(rq->tag < 0);
 
     if (!nvme_check_ready(&queue->ctrl->ctrl, rq, queue_ready))
         return nvme_fail_nonready_command(&queue->ctrl->ctrl, rq);
 
     dev = queue->device->dev;
 
     req->sqe.dma = ib_dma_map_single(dev, req->sqe.data,
                      sizeof(struct nvme_command),
                      DMA_TO_DEVICE);
     err = ib_dma_mapping_error(dev, req->sqe.dma);
     if (unlikely(err))
         return BLK_STS_RESOURCE;
 
     ib_dma_sync_single_for_cpu(dev, sqe->dma,
             sizeof(struct nvme_command), DMA_TO_DEVICE);
 
     ret = nvme_setup_cmd(ns, rq);
     if (ret)
         goto unmap_qe;
 
     blk_mq_start_request(rq);
 
     if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) &&
         queue->pi_support &&
         (c->common.opcode == nvme_cmd_write ||
          c->common.opcode == nvme_cmd_read) &&
         nvme_ns_has_pi(ns))
         req->use_sig_mr = true;
     else
         req->use_sig_mr = false;
 
     err = nvme_rdma_map_data(queue, rq, c);
     if (unlikely(err < 0)) {
         dev_err(queue->ctrl->ctrl.device,
                  "Failed to map data (%d)\n", err);
         goto err;
     }
 
     sqe->cqe.done = nvme_rdma_send_done;
 
     ib_dma_sync_single_for_device(dev, sqe->dma,
             sizeof(struct nvme_command), DMA_TO_DEVICE);
 
     err = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge,
             req->mr ? &req->reg_wr.wr : NULL);
     if (unlikely(err))
         goto err_unmap;
 
     return BLK_STS_OK;
 
 err_unmap:
     nvme_rdma_unmap_data(queue, rq);
 err:
     if (err == -EIO)
         ret = nvme_host_path_error(rq);
     else if (err == -ENOMEM || err == -EAGAIN)
         ret = BLK_STS_RESOURCE;
     else
         ret = BLK_STS_IOERR;
     nvme_cleanup_cmd(rq);
 unmap_qe:
     ib_dma_unmap_single(dev, req->sqe.dma, sizeof(struct nvme_command),
                 DMA_TO_DEVICE);
     return ret;
 }
 
 static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob)
 {
     struct nvme_rdma_queue *queue = hctx->driver_data;
 
     return ib_process_cq_direct(queue->ib_cq, -1);
 }
 
 static void nvme_rdma_check_pi_status(struct nvme_rdma_request *req)
 {
     struct request *rq = blk_mq_rq_from_pdu(req);
     struct ib_mr_status mr_status;
     int ret;
 
     ret = ib_check_mr_status(req->mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
     if (ret) {
         pr_err("ib_check_mr_status failed, ret %d\n", ret);
         nvme_req(rq)->status = NVME_SC_INVALID_PI;
         return;
     }
 
     if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
         switch (mr_status.sig_err.err_type) {
         case IB_SIG_BAD_GUARD:
             nvme_req(rq)->status = NVME_SC_GUARD_CHECK;
             break;
         case IB_SIG_BAD_REFTAG:
             nvme_req(rq)->status = NVME_SC_REFTAG_CHECK;
             break;
         case IB_SIG_BAD_APPTAG:
             nvme_req(rq)->status = NVME_SC_APPTAG_CHECK;
             break;
         }
         pr_err("PI error found type %d expected 0x%x vs actual 0x%x\n",
                mr_status.sig_err.err_type, mr_status.sig_err.expected,
                mr_status.sig_err.actual);
     }
 }
 
 static void nvme_rdma_complete_rq(struct request *rq)
 {
     struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
     struct nvme_rdma_queue *queue = req->queue;
     struct ib_device *ibdev = queue->device->dev;
 
     if (req->use_sig_mr)
         nvme_rdma_check_pi_status(req);
 
     nvme_rdma_unmap_data(queue, rq);
     ib_dma_unmap_single(ibdev, req->sqe.dma, sizeof(struct nvme_command),
                 DMA_TO_DEVICE);
     nvme_complete_rq(rq);
 }
 
 static int nvme_rdma_map_queues(struct blk_mq_tag_set *set)
 {
     struct nvme_rdma_ctrl *ctrl = set->driver_data;
     struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
 
     if (opts->nr_write_queues && ctrl->io_queues[HCTX_TYPE_READ]) {
         /* separate read/write queues */
         set->map[HCTX_TYPE_DEFAULT].nr_queues =
             ctrl->io_queues[HCTX_TYPE_DEFAULT];
         set->map[HCTX_TYPE_DEFAULT].queue_offset = 0;
         set->map[HCTX_TYPE_READ].nr_queues =
             ctrl->io_queues[HCTX_TYPE_READ];
         set->map[HCTX_TYPE_READ].queue_offset =
             ctrl->io_queues[HCTX_TYPE_DEFAULT];
     } else {
         /* shared read/write queues */
         set->map[HCTX_TYPE_DEFAULT].nr_queues =
             ctrl->io_queues[HCTX_TYPE_DEFAULT];
         set->map[HCTX_TYPE_DEFAULT].queue_offset = 0;
         set->map[HCTX_TYPE_READ].nr_queues =
             ctrl->io_queues[HCTX_TYPE_DEFAULT];
         set->map[HCTX_TYPE_READ].queue_offset = 0;
     }
     blk_mq_rdma_map_queues(&set->map[HCTX_TYPE_DEFAULT],
             ctrl->device->dev, 0);
     blk_mq_rdma_map_queues(&set->map[HCTX_TYPE_READ],
             ctrl->device->dev, 0);
 
     if (opts->nr_poll_queues && ctrl->io_queues[HCTX_TYPE_POLL]) {
         /* map dedicated poll queues only if we have queues left */
         set->map[HCTX_TYPE_POLL].nr_queues =
                 ctrl->io_queues[HCTX_TYPE_POLL];
         set->map[HCTX_TYPE_POLL].queue_offset =
             ctrl->io_queues[HCTX_TYPE_DEFAULT] +
             ctrl->io_queues[HCTX_TYPE_READ];
         blk_mq_map_queues(&set->map[HCTX_TYPE_POLL]);
     }
 
     dev_info(ctrl->ctrl.device,
         "mapped %d/%d/%d default/read/poll queues.\n",
         ctrl->io_queues[HCTX_TYPE_DEFAULT],
         ctrl->io_queues[HCTX_TYPE_READ],
         ctrl->io_queues[HCTX_TYPE_POLL]);
 
     return 0;
 }
 
 static const struct blk_mq_ops nvme_rdma_mq_ops = {
     .queue_rq   = nvme_rdma_queue_rq,
     .complete   = nvme_rdma_complete_rq,
     .init_request   = nvme_rdma_init_request,
     .exit_request   = nvme_rdma_exit_request,
     .init_hctx  = nvme_rdma_init_hctx,
     .timeout    = nvme_rdma_timeout,
     .map_queues = nvme_rdma_map_queues,
     .poll       = nvme_rdma_poll,
 };
 
 static const struct blk_mq_ops nvme_rdma_admin_mq_ops = {
     .queue_rq   = nvme_rdma_queue_rq,
     .complete   = nvme_rdma_complete_rq,
     .init_request   = nvme_rdma_init_request,
     .exit_request   = nvme_rdma_exit_request,
     .init_hctx  = nvme_rdma_init_admin_hctx,
     .timeout    = nvme_rdma_timeout,
 };
 
 static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
 {
     nvme_rdma_teardown_io_queues(ctrl, shutdown);
     nvme_stop_admin_queue(&ctrl->ctrl);
     if (shutdown)
         nvme_shutdown_ctrl(&ctrl->ctrl);
     else
         nvme_disable_ctrl(&ctrl->ctrl);
     nvme_rdma_teardown_admin_queue(ctrl, shutdown);
 }
 
 static void nvme_rdma_delete_ctrl(struct nvme_ctrl *ctrl)
 {
     nvme_rdma_shutdown_ctrl(to_rdma_ctrl(ctrl), true);
 }
 
 static void nvme_rdma_reset_ctrl_work(struct work_struct *work)
 {
     struct nvme_rdma_ctrl *ctrl =
         container_of(work, struct nvme_rdma_ctrl, ctrl.reset_work);
 
     nvme_stop_ctrl(&ctrl->ctrl);
     nvme_rdma_shutdown_ctrl(ctrl, false);
 
     if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
         /* state change failure should never happen */
         WARN_ON_ONCE(1);
         return;
     }
 
     if (nvme_rdma_setup_ctrl(ctrl, false))
         goto out_fail;
 
     return;
 
 out_fail:
     ++ctrl->ctrl.nr_reconnects;
     nvme_rdma_reconnect_or_remove(ctrl);
 }
 
 static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {
     .name           = "rdma",
     .module         = THIS_MODULE,
     .flags          = NVME_F_FABRICS | NVME_F_METADATA_SUPPORTED,
     .reg_read32     = nvmf_reg_read32,
     .reg_read64     = nvmf_reg_read64,
     .reg_write32        = nvmf_reg_write32,
     .free_ctrl      = nvme_rdma_free_ctrl,
     .submit_async_event = nvme_rdma_submit_async_event,
     .delete_ctrl        = nvme_rdma_delete_ctrl,
     .get_address        = nvmf_get_address,
     .stop_ctrl      = nvme_rdma_stop_ctrl,
 };
 
 /*
  * Fails a connection request if it matches an existing controller
  * (association) with the same tuple:
  * <Host NQN, Host ID, local address, remote address, remote port, SUBSYS NQN>
  *
  * if local address is not specified in the request, it will match an
  * existing controller with all the other parameters the same and no
  * local port address specified as well.
  *
  * The ports don't need to be compared as they are intrinsically
  * already matched by the port pointers supplied.
  */
 static bool
 nvme_rdma_existing_controller(struct nvmf_ctrl_options *opts)
 {
     struct nvme_rdma_ctrl *ctrl;
     bool found = false;
 
     mutex_lock(&nvme_rdma_ctrl_mutex);
     list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
         found = nvmf_ip_options_match(&ctrl->ctrl, opts);
         if (found)
             break;
     }
     mutex_unlock(&nvme_rdma_ctrl_mutex);
 
     return found;
 }
 
 static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
         struct nvmf_ctrl_options *opts)
 {
     struct nvme_rdma_ctrl *ctrl;
     int ret;
     bool changed;
 
     ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
     if (!ctrl)
         return ERR_PTR(-ENOMEM);
     ctrl->ctrl.opts = opts;
     INIT_LIST_HEAD(&ctrl->list);
 
     if (!(opts->mask & NVMF_OPT_TRSVCID)) {
         opts->trsvcid =
             kstrdup(__stringify(NVME_RDMA_IP_PORT), GFP_KERNEL);
         if (!opts->trsvcid) {
             ret = -ENOMEM;
             goto out_free_ctrl;
         }
         opts->mask |= NVMF_OPT_TRSVCID;
     }
 
     ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
             opts->traddr, opts->trsvcid, &ctrl->addr);
     if (ret) {
         pr_err("malformed address passed: %s:%s\n",
             opts->traddr, opts->trsvcid);
         goto out_free_ctrl;
     }
 
     if (opts->mask & NVMF_OPT_HOST_TRADDR) {
         ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
             opts->host_traddr, NULL, &ctrl->src_addr);
         if (ret) {
             pr_err("malformed src address passed: %s\n",
                    opts->host_traddr);
             goto out_free_ctrl;
         }
     }
 
     if (!opts->duplicate_connect && nvme_rdma_existing_controller(opts)) {
         ret = -EALREADY;
         goto out_free_ctrl;
     }
 
     INIT_DELAYED_WORK(&ctrl->reconnect_work,
             nvme_rdma_reconnect_ctrl_work);
     INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work);
     INIT_WORK(&ctrl->ctrl.reset_work, nvme_rdma_reset_ctrl_work);
 
     ctrl->ctrl.queue_count = opts->nr_io_queues + opts->nr_write_queues +
                 opts->nr_poll_queues + 1;
     ctrl->ctrl.sqsize = opts->queue_size - 1;
     ctrl->ctrl.kato = opts->kato;
 
     ret = -ENOMEM;
     ctrl->queues = kcalloc(ctrl->ctrl.queue_count, sizeof(*ctrl->queues),
                 GFP_KERNEL);
     if (!ctrl->queues)
         goto out_free_ctrl;
 
     ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops,
                 0 /* no quirks, we're perfect! */);
     if (ret)
         goto out_kfree_queues;
 
     changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING);
     WARN_ON_ONCE(!changed);
 
     ret = nvme_rdma_setup_ctrl(ctrl, true);
     if (ret)
         goto out_uninit_ctrl;
 
     dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISpcs\n",
         nvmf_ctrl_subsysnqn(&ctrl->ctrl), &ctrl->addr);
 
     mutex_lock(&nvme_rdma_ctrl_mutex);
     list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list);
     mutex_unlock(&nvme_rdma_ctrl_mutex);
 
     return &ctrl->ctrl;
 
 out_uninit_ctrl:
     nvme_uninit_ctrl(&ctrl->ctrl);
     nvme_put_ctrl(&ctrl->ctrl);
     if (ret > 0)
         ret = -EIO;
     return ERR_PTR(ret);
 out_kfree_queues:
     kfree(ctrl->queues);
 out_free_ctrl:
     kfree(ctrl);
     return ERR_PTR(ret);
 }
 
 static struct nvmf_transport_ops nvme_rdma_transport = {
     .name       = "rdma",
     .module     = THIS_MODULE,
     .required_opts  = NVMF_OPT_TRADDR,
     .allowed_opts   = NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY |
               NVMF_OPT_HOST_TRADDR | NVMF_OPT_CTRL_LOSS_TMO |
               NVMF_OPT_NR_WRITE_QUEUES | NVMF_OPT_NR_POLL_QUEUES |
               NVMF_OPT_TOS,
     .create_ctrl    = nvme_rdma_create_ctrl,
 };
 
 static void nvme_rdma_remove_one(struct ib_device *ib_device, void *client_data)
 {
     struct nvme_rdma_ctrl *ctrl;
     struct nvme_rdma_device *ndev;
     bool found = false;
 
     mutex_lock(&device_list_mutex);
     list_for_each_entry(ndev, &device_list, entry) {
         if (ndev->dev == ib_device) {
             found = true;
             break;
         }
     }
     mutex_unlock(&device_list_mutex);
 
     if (!found)
         return;
 
     /* Delete all controllers using this device */
     mutex_lock(&nvme_rdma_ctrl_mutex);
     list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
         if (ctrl->device->dev != ib_device)
             continue;
         nvme_delete_ctrl(&ctrl->ctrl);
     }
     mutex_unlock(&nvme_rdma_ctrl_mutex);
 
     flush_workqueue(nvme_delete_wq);
 }
 
 static struct ib_client nvme_rdma_ib_client = {
     .name   = "nvme_rdma",
     .remove = nvme_rdma_remove_one
 };
 
 static int __init nvme_rdma_init_module(void)
 {
     int ret;
 
     ret = ib_register_client(&nvme_rdma_ib_client);
     if (ret)
         return ret;
 
     ret = nvmf_register_transport(&nvme_rdma_transport);
     if (ret)
         goto err_unreg_client;
 
     return 0;
 
 err_unreg_client:
     ib_unregister_client(&nvme_rdma_ib_client);
     return ret;
 }
 
 static void __exit nvme_rdma_cleanup_module(void)
 {
     struct nvme_rdma_ctrl *ctrl;
 
     nvmf_unregister_transport(&nvme_rdma_transport);
     ib_unregister_client(&nvme_rdma_ib_client);
 
     mutex_lock(&nvme_rdma_ctrl_mutex);
     list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list)
         nvme_delete_ctrl(&ctrl->ctrl);
     mutex_unlock(&nvme_rdma_ctrl_mutex);
     flush_workqueue(nvme_delete_wq);
 }
 
 module_init(nvme_rdma_init_module);
 module_exit(nvme_rdma_cleanup_module);
 
 MODULE_LICENSE("GPL v2");