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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 TCP host.
  * Copyright (c) 2018 Lightbits Labs. All rights reserved.
  */
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/err.h>
 #include <linux/nvme-tcp.h>
 #include <net/sock.h>
 #include <net/tcp.h>
 #include <linux/blk-mq.h>
 #include <crypto/hash.h>
 #include <net/busy_poll.h>
 
 #include "nvme.h"
 #include "fabrics.h"
 
 struct nvme_tcp_queue;
 
 /* Define the socket priority to use for connections were it is desirable
  * that the NIC consider performing optimized packet processing or filtering.
  * A non-zero value being sufficient to indicate general consideration of any
  * possible optimization.  Making it a module param allows for alternative
  * values that may be unique for some NIC implementations.
  */
 static int so_priority;
 module_param(so_priority, int, 0644);
 MODULE_PARM_DESC(so_priority, "nvme tcp socket optimize priority");
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 /* lockdep can detect a circular dependency of the form
  *   sk_lock -> mmap_lock (page fault) -> fs locks -> sk_lock
  * because dependencies are tracked for both nvme-tcp and user contexts. Using
  * a separate class prevents lockdep from conflating nvme-tcp socket use with
  * user-space socket API use.
  */
 static struct lock_class_key nvme_tcp_sk_key[2];
 static struct lock_class_key nvme_tcp_slock_key[2];
 
 static void nvme_tcp_reclassify_socket(struct socket *sock)
 {
     struct sock *sk = sock->sk;
 
     if (WARN_ON_ONCE(!sock_allow_reclassification(sk)))
         return;
 
     switch (sk->sk_family) {
     case AF_INET:
         sock_lock_init_class_and_name(sk, "slock-AF_INET-NVME",
                           &nvme_tcp_slock_key[0],
                           "sk_lock-AF_INET-NVME",
                           &nvme_tcp_sk_key[0]);
         break;
     case AF_INET6:
         sock_lock_init_class_and_name(sk, "slock-AF_INET6-NVME",
                           &nvme_tcp_slock_key[1],
                           "sk_lock-AF_INET6-NVME",
                           &nvme_tcp_sk_key[1]);
         break;
     default:
         WARN_ON_ONCE(1);
     }
 }
 #else
 static void nvme_tcp_reclassify_socket(struct socket *sock) { }
 #endif
 
 enum nvme_tcp_send_state {
     NVME_TCP_SEND_CMD_PDU = 0,
     NVME_TCP_SEND_H2C_PDU,
     NVME_TCP_SEND_DATA,
     NVME_TCP_SEND_DDGST,
 };
 
 struct nvme_tcp_request {
     struct nvme_request req;
     void            *pdu;
     struct nvme_tcp_queue   *queue;
     u32         data_len;
     u32         pdu_len;
     u32         pdu_sent;
     u32         h2cdata_left;
     u32         h2cdata_offset;
     u16         ttag;
     __le16          status;
     struct list_head    entry;
     struct llist_node   lentry;
     __le32          ddgst;
 
     struct bio      *curr_bio;
     struct iov_iter     iter;
 
     /* send state */
     size_t          offset;
     size_t          data_sent;
     enum nvme_tcp_send_state state;
 };
 
 enum nvme_tcp_queue_flags {
     NVME_TCP_Q_ALLOCATED    = 0,
     NVME_TCP_Q_LIVE     = 1,
     NVME_TCP_Q_POLLING  = 2,
 };
 
 enum nvme_tcp_recv_state {
     NVME_TCP_RECV_PDU = 0,
     NVME_TCP_RECV_DATA,
     NVME_TCP_RECV_DDGST,
 };
 
 struct nvme_tcp_ctrl;
 struct nvme_tcp_queue {
     struct socket       *sock;
     struct work_struct  io_work;
     int         io_cpu;
 
     struct mutex        queue_lock;
     struct mutex        send_mutex;
     struct llist_head   req_list;
     struct list_head    send_list;
 
     /* recv state */
     void            *pdu;
     int         pdu_remaining;
     int         pdu_offset;
     size_t          data_remaining;
     size_t          ddgst_remaining;
     unsigned int        nr_cqe;
 
     /* send state */
     struct nvme_tcp_request *request;
 
     int         queue_size;
     u32         maxh2cdata;
     size_t          cmnd_capsule_len;
     struct nvme_tcp_ctrl    *ctrl;
     unsigned long       flags;
     bool            rd_enabled;
 
     bool            hdr_digest;
     bool            data_digest;
     struct ahash_request    *rcv_hash;
     struct ahash_request    *snd_hash;
     __le32          exp_ddgst;
     __le32          recv_ddgst;
 
     struct page_frag_cache  pf_cache;
 
     void (*state_change)(struct sock *);
     void (*data_ready)(struct sock *);
     void (*write_space)(struct sock *);
 };
 
 struct nvme_tcp_ctrl {
     /* read only in the hot path */
     struct nvme_tcp_queue   *queues;
     struct blk_mq_tag_set   tag_set;
 
     /* other member variables */
     struct list_head    list;
     struct blk_mq_tag_set   admin_tag_set;
     struct sockaddr_storage addr;
     struct sockaddr_storage src_addr;
     struct nvme_ctrl    ctrl;
 
     struct work_struct  err_work;
     struct delayed_work connect_work;
     struct nvme_tcp_request async_req;
     u32         io_queues[HCTX_MAX_TYPES];
 };
 
 static LIST_HEAD(nvme_tcp_ctrl_list);
 static DEFINE_MUTEX(nvme_tcp_ctrl_mutex);
 static struct workqueue_struct *nvme_tcp_wq;
 static const struct blk_mq_ops nvme_tcp_mq_ops;
 static const struct blk_mq_ops nvme_tcp_admin_mq_ops;
 static int nvme_tcp_try_send(struct nvme_tcp_queue *queue);
 
 static inline struct nvme_tcp_ctrl *to_tcp_ctrl(struct nvme_ctrl *ctrl)
 {
     return container_of(ctrl, struct nvme_tcp_ctrl, ctrl);
 }
 
 static inline int nvme_tcp_queue_id(struct nvme_tcp_queue *queue)
 {
     return queue - queue->ctrl->queues;
 }
 
 static inline struct blk_mq_tags *nvme_tcp_tagset(struct nvme_tcp_queue *queue)
 {
     u32 queue_idx = nvme_tcp_queue_id(queue);
 
     if (queue_idx == 0)
         return queue->ctrl->admin_tag_set.tags[queue_idx];
     return queue->ctrl->tag_set.tags[queue_idx - 1];
 }
 
 static inline u8 nvme_tcp_hdgst_len(struct nvme_tcp_queue *queue)
 {
     return queue->hdr_digest ? NVME_TCP_DIGEST_LENGTH : 0;
 }
 
 static inline u8 nvme_tcp_ddgst_len(struct nvme_tcp_queue *queue)
 {
     return queue->data_digest ? NVME_TCP_DIGEST_LENGTH : 0;
 }
 
 static inline size_t nvme_tcp_inline_data_size(struct nvme_tcp_request *req)
 {
     if (nvme_is_fabrics(req->req.cmd))
         return NVME_TCP_ADMIN_CCSZ;
     return req->queue->cmnd_capsule_len - sizeof(struct nvme_command);
 }
 
 static inline bool nvme_tcp_async_req(struct nvme_tcp_request *req)
 {
     return req == &req->queue->ctrl->async_req;
 }
 
 static inline bool nvme_tcp_has_inline_data(struct nvme_tcp_request *req)
 {
     struct request *rq;
 
     if (unlikely(nvme_tcp_async_req(req)))
         return false; /* async events don't have a request */
 
     rq = blk_mq_rq_from_pdu(req);
 
     return rq_data_dir(rq) == WRITE && req->data_len &&
         req->data_len <= nvme_tcp_inline_data_size(req);
 }
 
 static inline struct page *nvme_tcp_req_cur_page(struct nvme_tcp_request *req)
 {
     return req->iter.bvec->bv_page;
 }
 
 static inline size_t nvme_tcp_req_cur_offset(struct nvme_tcp_request *req)
 {
     return req->iter.bvec->bv_offset + req->iter.iov_offset;
 }
 
 static inline size_t nvme_tcp_req_cur_length(struct nvme_tcp_request *req)
 {
     return min_t(size_t, iov_iter_single_seg_count(&req->iter),
             req->pdu_len - req->pdu_sent);
 }
 
 static inline size_t nvme_tcp_pdu_data_left(struct nvme_tcp_request *req)
 {
     return rq_data_dir(blk_mq_rq_from_pdu(req)) == WRITE ?
             req->pdu_len - req->pdu_sent : 0;
 }
 
 static inline size_t nvme_tcp_pdu_last_send(struct nvme_tcp_request *req,
         int len)
 {
     return nvme_tcp_pdu_data_left(req) <= len;
 }
 
 static void nvme_tcp_init_iter(struct nvme_tcp_request *req,
         unsigned int dir)
 {
     struct request *rq = blk_mq_rq_from_pdu(req);
     struct bio_vec *vec;
     unsigned int size;
     int nr_bvec;
     size_t offset;
 
     if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) {
         vec = &rq->special_vec;
         nr_bvec = 1;
         size = blk_rq_payload_bytes(rq);
         offset = 0;
     } else {
         struct bio *bio = req->curr_bio;
         struct bvec_iter bi;
         struct bio_vec bv;
 
         vec = __bvec_iter_bvec(bio->bi_io_vec, bio->bi_iter);
         nr_bvec = 0;
         bio_for_each_bvec(bv, bio, bi) {
             nr_bvec++;
         }
         size = bio->bi_iter.bi_size;
         offset = bio->bi_iter.bi_bvec_done;
     }
 
     iov_iter_bvec(&req->iter, dir, vec, nr_bvec, size);
     req->iter.iov_offset = offset;
 }
 
 static inline void nvme_tcp_advance_req(struct nvme_tcp_request *req,
         int len)
 {
     req->data_sent += len;
     req->pdu_sent += len;
     iov_iter_advance(&req->iter, len);
     if (!iov_iter_count(&req->iter) &&
         req->data_sent < req->data_len) {
         req->curr_bio = req->curr_bio->bi_next;
         nvme_tcp_init_iter(req, WRITE);
     }
 }
 
 static inline void nvme_tcp_send_all(struct nvme_tcp_queue *queue)
 {
     int ret;
 
     /* drain the send queue as much as we can... */
     do {
         ret = nvme_tcp_try_send(queue);
     } while (ret > 0);
 }
 
 static inline bool nvme_tcp_queue_more(struct nvme_tcp_queue *queue)
 {
     return !list_empty(&queue->send_list) ||
         !llist_empty(&queue->req_list);
 }
 
 static inline void nvme_tcp_queue_request(struct nvme_tcp_request *req,
         bool sync, bool last)
 {
     struct nvme_tcp_queue *queue = req->queue;
     bool empty;
 
     empty = llist_add(&req->lentry, &queue->req_list) &&
         list_empty(&queue->send_list) && !queue->request;
 
     /*
      * if we're the first on the send_list and we can try to send
      * directly, otherwise queue io_work. Also, only do that if we
      * are on the same cpu, so we don't introduce contention.
      */
     if (queue->io_cpu == raw_smp_processor_id() &&
         sync && empty && mutex_trylock(&queue->send_mutex)) {
         nvme_tcp_send_all(queue);
         mutex_unlock(&queue->send_mutex);
     }
 
     if (last && nvme_tcp_queue_more(queue))
         queue_work_on(queue->io_cpu, nvme_tcp_wq, &queue->io_work);
 }
 
 static void nvme_tcp_process_req_list(struct nvme_tcp_queue *queue)
 {
     struct nvme_tcp_request *req;
     struct llist_node *node;
 
     for (node = llist_del_all(&queue->req_list); node; node = node->next) {
         req = llist_entry(node, struct nvme_tcp_request, lentry);
         list_add(&req->entry, &queue->send_list);
     }
 }
 
 static inline struct nvme_tcp_request *
 nvme_tcp_fetch_request(struct nvme_tcp_queue *queue)
 {
     struct nvme_tcp_request *req;
 
     req = list_first_entry_or_null(&queue->send_list,
             struct nvme_tcp_request, entry);
     if (!req) {
         nvme_tcp_process_req_list(queue);
         req = list_first_entry_or_null(&queue->send_list,
                 struct nvme_tcp_request, entry);
         if (unlikely(!req))
             return NULL;
     }
 
     list_del(&req->entry);
     return req;
 }
 
 static inline void nvme_tcp_ddgst_final(struct ahash_request *hash,
         __le32 *dgst)
 {
     ahash_request_set_crypt(hash, NULL, (u8 *)dgst, 0);
     crypto_ahash_final(hash);
 }
 
 static inline void nvme_tcp_ddgst_update(struct ahash_request *hash,
         struct page *page, off_t off, size_t len)
 {
     struct scatterlist sg;
 
     sg_init_marker(&sg, 1);
     sg_set_page(&sg, page, len, off);
     ahash_request_set_crypt(hash, &sg, NULL, len);
     crypto_ahash_update(hash);
 }
 
 static inline void nvme_tcp_hdgst(struct ahash_request *hash,
         void *pdu, size_t len)
 {
     struct scatterlist sg;
 
     sg_init_one(&sg, pdu, len);
     ahash_request_set_crypt(hash, &sg, pdu + len, len);
     crypto_ahash_digest(hash);
 }
 
 static int nvme_tcp_verify_hdgst(struct nvme_tcp_queue *queue,
         void *pdu, size_t pdu_len)
 {
     struct nvme_tcp_hdr *hdr = pdu;
     __le32 recv_digest;
     __le32 exp_digest;
 
     if (unlikely(!(hdr->flags & NVME_TCP_F_HDGST))) {
         dev_err(queue->ctrl->ctrl.device,
             "queue %d: header digest flag is cleared\n",
             nvme_tcp_queue_id(queue));
         return -EPROTO;
     }
 
     recv_digest = *(__le32 *)(pdu + hdr->hlen);
     nvme_tcp_hdgst(queue->rcv_hash, pdu, pdu_len);
     exp_digest = *(__le32 *)(pdu + hdr->hlen);
     if (recv_digest != exp_digest) {
         dev_err(queue->ctrl->ctrl.device,
             "header digest error: recv %#x expected %#x\n",
             le32_to_cpu(recv_digest), le32_to_cpu(exp_digest));
         return -EIO;
     }
 
     return 0;
 }
 
 static int nvme_tcp_check_ddgst(struct nvme_tcp_queue *queue, void *pdu)
 {
     struct nvme_tcp_hdr *hdr = pdu;
     u8 digest_len = nvme_tcp_hdgst_len(queue);
     u32 len;
 
     len = le32_to_cpu(hdr->plen) - hdr->hlen -
         ((hdr->flags & NVME_TCP_F_HDGST) ? digest_len : 0);
 
     if (unlikely(len && !(hdr->flags & NVME_TCP_F_DDGST))) {
         dev_err(queue->ctrl->ctrl.device,
             "queue %d: data digest flag is cleared\n",
         nvme_tcp_queue_id(queue));
         return -EPROTO;
     }
     crypto_ahash_init(queue->rcv_hash);
 
     return 0;
 }
 
 static void nvme_tcp_exit_request(struct blk_mq_tag_set *set,
         struct request *rq, unsigned int hctx_idx)
 {
     struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq);
 
     page_frag_free(req->pdu);
 }
 
 static int nvme_tcp_init_request(struct blk_mq_tag_set *set,
         struct request *rq, unsigned int hctx_idx,
         unsigned int numa_node)
 {
     struct nvme_tcp_ctrl *ctrl = set->driver_data;
     struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq);
     struct nvme_tcp_cmd_pdu *pdu;
     int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0;
     struct nvme_tcp_queue *queue = &ctrl->queues[queue_idx];
     u8 hdgst = nvme_tcp_hdgst_len(queue);
 
     req->pdu = page_frag_alloc(&queue->pf_cache,
         sizeof(struct nvme_tcp_cmd_pdu) + hdgst,
         GFP_KERNEL | __GFP_ZERO);
     if (!req->pdu)
         return -ENOMEM;
 
     pdu = req->pdu;
     req->queue = queue;
     nvme_req(rq)->ctrl = &ctrl->ctrl;
     nvme_req(rq)->cmd = &pdu->cmd;
 
     return 0;
 }
 
 static int nvme_tcp_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
         unsigned int hctx_idx)
 {
     struct nvme_tcp_ctrl *ctrl = data;
     struct nvme_tcp_queue *queue = &ctrl->queues[hctx_idx + 1];
 
     hctx->driver_data = queue;
     return 0;
 }
 
 static int nvme_tcp_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
         unsigned int hctx_idx)
 {
     struct nvme_tcp_ctrl *ctrl = data;
     struct nvme_tcp_queue *queue = &ctrl->queues[0];
 
     hctx->driver_data = queue;
     return 0;
 }
 
 static enum nvme_tcp_recv_state
 nvme_tcp_recv_state(struct nvme_tcp_queue *queue)
 {
     return  (queue->pdu_remaining) ? NVME_TCP_RECV_PDU :
         (queue->ddgst_remaining) ? NVME_TCP_RECV_DDGST :
         NVME_TCP_RECV_DATA;
 }
 
 static void nvme_tcp_init_recv_ctx(struct nvme_tcp_queue *queue)
 {
     queue->pdu_remaining = sizeof(struct nvme_tcp_rsp_pdu) +
                 nvme_tcp_hdgst_len(queue);
     queue->pdu_offset = 0;
     queue->data_remaining = -1;
     queue->ddgst_remaining = 0;
 }
 
 static void nvme_tcp_error_recovery(struct nvme_ctrl *ctrl)
 {
     if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING))
         return;
 
     dev_warn(ctrl->device, "starting error recovery\n");
     queue_work(nvme_reset_wq, &to_tcp_ctrl(ctrl)->err_work);
 }
 
 static int nvme_tcp_process_nvme_cqe(struct nvme_tcp_queue *queue,
         struct nvme_completion *cqe)
 {
     struct nvme_tcp_request *req;
     struct request *rq;
 
     rq = nvme_find_rq(nvme_tcp_tagset(queue), cqe->command_id);
     if (!rq) {
         dev_err(queue->ctrl->ctrl.device,
             "got bad cqe.command_id %#x on queue %d\n",
             cqe->command_id, nvme_tcp_queue_id(queue));
         nvme_tcp_error_recovery(&queue->ctrl->ctrl);
         return -EINVAL;
     }
 
     req = blk_mq_rq_to_pdu(rq);
     if (req->status == cpu_to_le16(NVME_SC_SUCCESS))
         req->status = cqe->status;
 
     if (!nvme_try_complete_req(rq, req->status, cqe->result))
         nvme_complete_rq(rq);
     queue->nr_cqe++;
 
     return 0;
 }
 
 static int nvme_tcp_handle_c2h_data(struct nvme_tcp_queue *queue,
         struct nvme_tcp_data_pdu *pdu)
 {
     struct request *rq;
 
     rq = nvme_find_rq(nvme_tcp_tagset(queue), pdu->command_id);
     if (!rq) {
         dev_err(queue->ctrl->ctrl.device,
             "got bad c2hdata.command_id %#x on queue %d\n",
             pdu->command_id, nvme_tcp_queue_id(queue));
         return -ENOENT;
     }
 
     if (!blk_rq_payload_bytes(rq)) {
         dev_err(queue->ctrl->ctrl.device,
             "queue %d tag %#x unexpected data\n",
             nvme_tcp_queue_id(queue), rq->tag);
         return -EIO;
     }
 
     queue->data_remaining = le32_to_cpu(pdu->data_length);
 
     if (pdu->hdr.flags & NVME_TCP_F_DATA_SUCCESS &&
         unlikely(!(pdu->hdr.flags & NVME_TCP_F_DATA_LAST))) {
         dev_err(queue->ctrl->ctrl.device,
             "queue %d tag %#x SUCCESS set but not last PDU\n",
             nvme_tcp_queue_id(queue), rq->tag);
         nvme_tcp_error_recovery(&queue->ctrl->ctrl);
         return -EPROTO;
     }
 
     return 0;
 }
 
 static int nvme_tcp_handle_comp(struct nvme_tcp_queue *queue,
         struct nvme_tcp_rsp_pdu *pdu)
 {
     struct nvme_completion *cqe = &pdu->cqe;
     int ret = 0;
 
     /*
      * 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_tcp_queue_id(queue),
                      cqe->command_id)))
         nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
                 &cqe->result);
     else
         ret = nvme_tcp_process_nvme_cqe(queue, cqe);
 
     return ret;
 }
 
 static void nvme_tcp_setup_h2c_data_pdu(struct nvme_tcp_request *req)
 {
     struct nvme_tcp_data_pdu *data = req->pdu;
     struct nvme_tcp_queue *queue = req->queue;
     struct request *rq = blk_mq_rq_from_pdu(req);
     u32 h2cdata_sent = req->pdu_len;
     u8 hdgst = nvme_tcp_hdgst_len(queue);
     u8 ddgst = nvme_tcp_ddgst_len(queue);
 
     req->state = NVME_TCP_SEND_H2C_PDU;
     req->offset = 0;
     req->pdu_len = min(req->h2cdata_left, queue->maxh2cdata);
     req->pdu_sent = 0;
     req->h2cdata_left -= req->pdu_len;
     req->h2cdata_offset += h2cdata_sent;
 
     memset(data, 0, sizeof(*data));
     data->hdr.type = nvme_tcp_h2c_data;
     if (!req->h2cdata_left)
         data->hdr.flags = NVME_TCP_F_DATA_LAST;
     if (queue->hdr_digest)
         data->hdr.flags |= NVME_TCP_F_HDGST;
     if (queue->data_digest)
         data->hdr.flags |= NVME_TCP_F_DDGST;
     data->hdr.hlen = sizeof(*data);
     data->hdr.pdo = data->hdr.hlen + hdgst;
     data->hdr.plen =
         cpu_to_le32(data->hdr.hlen + hdgst + req->pdu_len + ddgst);
     data->ttag = req->ttag;
     data->command_id = nvme_cid(rq);
     data->data_offset = cpu_to_le32(req->h2cdata_offset);
     data->data_length = cpu_to_le32(req->pdu_len);
 }
 
 static int nvme_tcp_handle_r2t(struct nvme_tcp_queue *queue,
         struct nvme_tcp_r2t_pdu *pdu)
 {
     struct nvme_tcp_request *req;
     struct request *rq;
     u32 r2t_length = le32_to_cpu(pdu->r2t_length);
     u32 r2t_offset = le32_to_cpu(pdu->r2t_offset);
 
     rq = nvme_find_rq(nvme_tcp_tagset(queue), pdu->command_id);
     if (!rq) {
         dev_err(queue->ctrl->ctrl.device,
             "got bad r2t.command_id %#x on queue %d\n",
             pdu->command_id, nvme_tcp_queue_id(queue));
         return -ENOENT;
     }
     req = blk_mq_rq_to_pdu(rq);
 
     if (unlikely(!r2t_length)) {
         dev_err(queue->ctrl->ctrl.device,
             "req %d r2t len is %u, probably a bug...\n",
             rq->tag, r2t_length);
         return -EPROTO;
     }
 
     if (unlikely(req->data_sent + r2t_length > req->data_len)) {
         dev_err(queue->ctrl->ctrl.device,
             "req %d r2t len %u exceeded data len %u (%zu sent)\n",
             rq->tag, r2t_length, req->data_len, req->data_sent);
         return -EPROTO;
     }
 
     if (unlikely(r2t_offset < req->data_sent)) {
         dev_err(queue->ctrl->ctrl.device,
             "req %d unexpected r2t offset %u (expected %zu)\n",
             rq->tag, r2t_offset, req->data_sent);
         return -EPROTO;
     }
 
     req->pdu_len = 0;
     req->h2cdata_left = r2t_length;
     req->h2cdata_offset = r2t_offset;
     req->ttag = pdu->ttag;
 
     nvme_tcp_setup_h2c_data_pdu(req);
     nvme_tcp_queue_request(req, false, true);
 
     return 0;
 }
 
 static int nvme_tcp_recv_pdu(struct nvme_tcp_queue *queue, struct sk_buff *skb,
         unsigned int *offset, size_t *len)
 {
     struct nvme_tcp_hdr *hdr;
     char *pdu = queue->pdu;
     size_t rcv_len = min_t(size_t, *len, queue->pdu_remaining);
     int ret;
 
     ret = skb_copy_bits(skb, *offset,
         &pdu[queue->pdu_offset], rcv_len);
     if (unlikely(ret))
         return ret;
 
     queue->pdu_remaining -= rcv_len;
     queue->pdu_offset += rcv_len;
     *offset += rcv_len;
     *len -= rcv_len;
     if (queue->pdu_remaining)
         return 0;
 
     hdr = queue->pdu;
     if (queue->hdr_digest) {
         ret = nvme_tcp_verify_hdgst(queue, queue->pdu, hdr->hlen);
         if (unlikely(ret))
             return ret;
     }
 
 
     if (queue->data_digest) {
         ret = nvme_tcp_check_ddgst(queue, queue->pdu);
         if (unlikely(ret))
             return ret;
     }
 
     switch (hdr->type) {
     case nvme_tcp_c2h_data:
         return nvme_tcp_handle_c2h_data(queue, (void *)queue->pdu);
     case nvme_tcp_rsp:
         nvme_tcp_init_recv_ctx(queue);
         return nvme_tcp_handle_comp(queue, (void *)queue->pdu);
     case nvme_tcp_r2t:
         nvme_tcp_init_recv_ctx(queue);
         return nvme_tcp_handle_r2t(queue, (void *)queue->pdu);
     default:
         dev_err(queue->ctrl->ctrl.device,
             "unsupported pdu type (%d)\n", hdr->type);
         return -EINVAL;
     }
 }
 
 static inline void nvme_tcp_end_request(struct request *rq, u16 status)
 {
     union nvme_result res = {};
 
     if (!nvme_try_complete_req(rq, cpu_to_le16(status << 1), res))
         nvme_complete_rq(rq);
 }
 
 static int nvme_tcp_recv_data(struct nvme_tcp_queue *queue, struct sk_buff *skb,
                   unsigned int *offset, size_t *len)
 {
     struct nvme_tcp_data_pdu *pdu = (void *)queue->pdu;
     struct request *rq =
         nvme_cid_to_rq(nvme_tcp_tagset(queue), pdu->command_id);
     struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq);
 
     while (true) {
         int recv_len, ret;
 
         recv_len = min_t(size_t, *len, queue->data_remaining);
         if (!recv_len)
             break;
 
         if (!iov_iter_count(&req->iter)) {
             req->curr_bio = req->curr_bio->bi_next;
 
             /*
              * If we don`t have any bios it means that controller
              * sent more data than we requested, hence error
              */
             if (!req->curr_bio) {
                 dev_err(queue->ctrl->ctrl.device,
                     "queue %d no space in request %#x",
                     nvme_tcp_queue_id(queue), rq->tag);
                 nvme_tcp_init_recv_ctx(queue);
                 return -EIO;
             }
             nvme_tcp_init_iter(req, READ);
         }
 
         /* we can read only from what is left in this bio */
         recv_len = min_t(size_t, recv_len,
                 iov_iter_count(&req->iter));
 
         if (queue->data_digest)
             ret = skb_copy_and_hash_datagram_iter(skb, *offset,
                 &req->iter, recv_len, queue->rcv_hash);
         else
             ret = skb_copy_datagram_iter(skb, *offset,
                     &req->iter, recv_len);
         if (ret) {
             dev_err(queue->ctrl->ctrl.device,
                 "queue %d failed to copy request %#x data",
                 nvme_tcp_queue_id(queue), rq->tag);
             return ret;
         }
 
         *len -= recv_len;
         *offset += recv_len;
         queue->data_remaining -= recv_len;
     }
 
     if (!queue->data_remaining) {
         if (queue->data_digest) {
             nvme_tcp_ddgst_final(queue->rcv_hash, &queue->exp_ddgst);
             queue->ddgst_remaining = NVME_TCP_DIGEST_LENGTH;
         } else {
             if (pdu->hdr.flags & NVME_TCP_F_DATA_SUCCESS) {
                 nvme_tcp_end_request(rq,
                         le16_to_cpu(req->status));
                 queue->nr_cqe++;
             }
             nvme_tcp_init_recv_ctx(queue);
         }
     }
 
     return 0;
 }
 
 static int nvme_tcp_recv_ddgst(struct nvme_tcp_queue *queue,
         struct sk_buff *skb, unsigned int *offset, size_t *len)
 {
     struct nvme_tcp_data_pdu *pdu = (void *)queue->pdu;
     char *ddgst = (char *)&queue->recv_ddgst;
     size_t recv_len = min_t(size_t, *len, queue->ddgst_remaining);
     off_t off = NVME_TCP_DIGEST_LENGTH - queue->ddgst_remaining;
     int ret;
 
     ret = skb_copy_bits(skb, *offset, &ddgst[off], recv_len);
     if (unlikely(ret))
         return ret;
 
     queue->ddgst_remaining -= recv_len;
     *offset += recv_len;
     *len -= recv_len;
     if (queue->ddgst_remaining)
         return 0;
 
     if (queue->recv_ddgst != queue->exp_ddgst) {
         struct request *rq = nvme_cid_to_rq(nvme_tcp_tagset(queue),
                     pdu->command_id);
         struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq);
 
         req->status = cpu_to_le16(NVME_SC_DATA_XFER_ERROR);
 
         dev_err(queue->ctrl->ctrl.device,
             "data digest error: recv %#x expected %#x\n",
             le32_to_cpu(queue->recv_ddgst),
             le32_to_cpu(queue->exp_ddgst));
     }
 
     if (pdu->hdr.flags & NVME_TCP_F_DATA_SUCCESS) {
         struct request *rq = nvme_cid_to_rq(nvme_tcp_tagset(queue),
                     pdu->command_id);
         struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq);
 
         nvme_tcp_end_request(rq, le16_to_cpu(req->status));
         queue->nr_cqe++;
     }
 
     nvme_tcp_init_recv_ctx(queue);
     return 0;
 }
 
 static int nvme_tcp_recv_skb(read_descriptor_t *desc, struct sk_buff *skb,
                  unsigned int offset, size_t len)
 {
     struct nvme_tcp_queue *queue = desc->arg.data;
     size_t consumed = len;
     int result;
 
     while (len) {
         switch (nvme_tcp_recv_state(queue)) {
         case NVME_TCP_RECV_PDU:
             result = nvme_tcp_recv_pdu(queue, skb, &offset, &len);
             break;
         case NVME_TCP_RECV_DATA:
             result = nvme_tcp_recv_data(queue, skb, &offset, &len);
             break;
         case NVME_TCP_RECV_DDGST:
             result = nvme_tcp_recv_ddgst(queue, skb, &offset, &len);
             break;
         default:
             result = -EFAULT;
         }
         if (result) {
             dev_err(queue->ctrl->ctrl.device,
                 "receive failed:  %d\n", result);
             queue->rd_enabled = false;
             nvme_tcp_error_recovery(&queue->ctrl->ctrl);
             return result;
         }
     }
 
     return consumed;
 }
 
 static void nvme_tcp_data_ready(struct sock *sk)
 {
     struct nvme_tcp_queue *queue;
 
     read_lock_bh(&sk->sk_callback_lock);
     queue = sk->sk_user_data;
     if (likely(queue && queue->rd_enabled) &&
         !test_bit(NVME_TCP_Q_POLLING, &queue->flags))
         queue_work_on(queue->io_cpu, nvme_tcp_wq, &queue->io_work);
     read_unlock_bh(&sk->sk_callback_lock);
 }
 
 static void nvme_tcp_write_space(struct sock *sk)
 {
     struct nvme_tcp_queue *queue;
 
     read_lock_bh(&sk->sk_callback_lock);
     queue = sk->sk_user_data;
     if (likely(queue && sk_stream_is_writeable(sk))) {
         clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
         queue_work_on(queue->io_cpu, nvme_tcp_wq, &queue->io_work);
     }
     read_unlock_bh(&sk->sk_callback_lock);
 }
 
 static void nvme_tcp_state_change(struct sock *sk)
 {
     struct nvme_tcp_queue *queue;
 
     read_lock_bh(&sk->sk_callback_lock);
     queue = sk->sk_user_data;
     if (!queue)
         goto done;
 
     switch (sk->sk_state) {
     case TCP_CLOSE:
     case TCP_CLOSE_WAIT:
     case TCP_LAST_ACK:
     case TCP_FIN_WAIT1:
     case TCP_FIN_WAIT2:
         nvme_tcp_error_recovery(&queue->ctrl->ctrl);
         break;
     default:
         dev_info(queue->ctrl->ctrl.device,
             "queue %d socket state %d\n",
             nvme_tcp_queue_id(queue), sk->sk_state);
     }
 
     queue->state_change(sk);
 done:
     read_unlock_bh(&sk->sk_callback_lock);
 }
 
 static inline void nvme_tcp_done_send_req(struct nvme_tcp_queue *queue)
 {
     queue->request = NULL;
 }
 
 static void nvme_tcp_fail_request(struct nvme_tcp_request *req)
 {
     if (nvme_tcp_async_req(req)) {
         union nvme_result res = {};
 
         nvme_complete_async_event(&req->queue->ctrl->ctrl,
                 cpu_to_le16(NVME_SC_HOST_PATH_ERROR), &res);
     } else {
         nvme_tcp_end_request(blk_mq_rq_from_pdu(req),
                 NVME_SC_HOST_PATH_ERROR);
     }
 }
 
 static int nvme_tcp_try_send_data(struct nvme_tcp_request *req)
 {
     struct nvme_tcp_queue *queue = req->queue;
     int req_data_len = req->data_len;
     u32 h2cdata_left = req->h2cdata_left;
 
     while (true) {
         struct page *page = nvme_tcp_req_cur_page(req);
         size_t offset = nvme_tcp_req_cur_offset(req);
         size_t len = nvme_tcp_req_cur_length(req);
         bool last = nvme_tcp_pdu_last_send(req, len);
         int req_data_sent = req->data_sent;
         int ret, flags = MSG_DONTWAIT;
 
         if (last && !queue->data_digest && !nvme_tcp_queue_more(queue))
             flags |= MSG_EOR;
         else
             flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
 
         if (sendpage_ok(page)) {
             ret = kernel_sendpage(queue->sock, page, offset, len,
                     flags);
         } else {
             ret = sock_no_sendpage(queue->sock, page, offset, len,
                     flags);
         }
         if (ret <= 0)
             return ret;
 
         if (queue->data_digest)
             nvme_tcp_ddgst_update(queue->snd_hash, page,
                     offset, ret);
 
         /*
          * update the request iterator except for the last payload send
          * in the request where we don't want to modify it as we may
          * compete with the RX path completing the request.
          */
         if (req_data_sent + ret < req_data_len)
             nvme_tcp_advance_req(req, ret);
 
         /* fully successful last send in current PDU */
         if (last && ret == len) {
             if (queue->data_digest) {
                 nvme_tcp_ddgst_final(queue->snd_hash,
                     &req->ddgst);
                 req->state = NVME_TCP_SEND_DDGST;
                 req->offset = 0;
             } else {
                 if (h2cdata_left)
                     nvme_tcp_setup_h2c_data_pdu(req);
                 else
                     nvme_tcp_done_send_req(queue);
             }
             return 1;
         }
     }
     return -EAGAIN;
 }
 
 static int nvme_tcp_try_send_cmd_pdu(struct nvme_tcp_request *req)
 {
     struct nvme_tcp_queue *queue = req->queue;
     struct nvme_tcp_cmd_pdu *pdu = req->pdu;
     bool inline_data = nvme_tcp_has_inline_data(req);
     u8 hdgst = nvme_tcp_hdgst_len(queue);
     int len = sizeof(*pdu) + hdgst - req->offset;
     int flags = MSG_DONTWAIT;
     int ret;
 
     if (inline_data || nvme_tcp_queue_more(queue))
         flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
     else
         flags |= MSG_EOR;
 
     if (queue->hdr_digest && !req->offset)
         nvme_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
 
     ret = kernel_sendpage(queue->sock, virt_to_page(pdu),
             offset_in_page(pdu) + req->offset, len,  flags);
     if (unlikely(ret <= 0))
         return ret;
 
     len -= ret;
     if (!len) {
         if (inline_data) {
             req->state = NVME_TCP_SEND_DATA;
             if (queue->data_digest)
                 crypto_ahash_init(queue->snd_hash);
         } else {
             nvme_tcp_done_send_req(queue);
         }
         return 1;
     }
     req->offset += ret;
 
     return -EAGAIN;
 }
 
 static int nvme_tcp_try_send_data_pdu(struct nvme_tcp_request *req)
 {
     struct nvme_tcp_queue *queue = req->queue;
     struct nvme_tcp_data_pdu *pdu = req->pdu;
     u8 hdgst = nvme_tcp_hdgst_len(queue);
     int len = sizeof(*pdu) - req->offset + hdgst;
     int ret;
 
     if (queue->hdr_digest && !req->offset)
         nvme_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
 
     if (!req->h2cdata_left)
         ret = kernel_sendpage(queue->sock, virt_to_page(pdu),
                 offset_in_page(pdu) + req->offset, len,
                 MSG_DONTWAIT | MSG_MORE | MSG_SENDPAGE_NOTLAST);
     else
         ret = sock_no_sendpage(queue->sock, virt_to_page(pdu),
                 offset_in_page(pdu) + req->offset, len,
                 MSG_DONTWAIT | MSG_MORE);
     if (unlikely(ret <= 0))
         return ret;
 
     len -= ret;
     if (!len) {
         req->state = NVME_TCP_SEND_DATA;
         if (queue->data_digest)
             crypto_ahash_init(queue->snd_hash);
         return 1;
     }
     req->offset += ret;
 
     return -EAGAIN;
 }
 
 static int nvme_tcp_try_send_ddgst(struct nvme_tcp_request *req)
 {
     struct nvme_tcp_queue *queue = req->queue;
     size_t offset = req->offset;
     u32 h2cdata_left = req->h2cdata_left;
     int ret;
     struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
     struct kvec iov = {
         .iov_base = (u8 *)&req->ddgst + req->offset,
         .iov_len = NVME_TCP_DIGEST_LENGTH - req->offset
     };
 
     if (nvme_tcp_queue_more(queue))
         msg.msg_flags |= MSG_MORE;
     else
         msg.msg_flags |= MSG_EOR;
 
     ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len);
     if (unlikely(ret <= 0))
         return ret;
 
     if (offset + ret == NVME_TCP_DIGEST_LENGTH) {
         if (h2cdata_left)
             nvme_tcp_setup_h2c_data_pdu(req);
         else
             nvme_tcp_done_send_req(queue);
         return 1;
     }
 
     req->offset += ret;
     return -EAGAIN;
 }
 
 static int nvme_tcp_try_send(struct nvme_tcp_queue *queue)
 {
     struct nvme_tcp_request *req;
     int ret = 1;
 
     if (!queue->request) {
         queue->request = nvme_tcp_fetch_request(queue);
         if (!queue->request)
             return 0;
     }
     req = queue->request;
 
     if (req->state == NVME_TCP_SEND_CMD_PDU) {
         ret = nvme_tcp_try_send_cmd_pdu(req);
         if (ret <= 0)
             goto done;
         if (!nvme_tcp_has_inline_data(req))
             return ret;
     }
 
     if (req->state == NVME_TCP_SEND_H2C_PDU) {
         ret = nvme_tcp_try_send_data_pdu(req);
         if (ret <= 0)
             goto done;
     }
 
     if (req->state == NVME_TCP_SEND_DATA) {
         ret = nvme_tcp_try_send_data(req);
         if (ret <= 0)
             goto done;
     }
 
     if (req->state == NVME_TCP_SEND_DDGST)
         ret = nvme_tcp_try_send_ddgst(req);
 done:
     if (ret == -EAGAIN) {
         ret = 0;
     } else if (ret < 0) {
         dev_err(queue->ctrl->ctrl.device,
             "failed to send request %d\n", ret);
         nvme_tcp_fail_request(queue->request);
         nvme_tcp_done_send_req(queue);
     }
     return ret;
 }
 
 static int nvme_tcp_try_recv(struct nvme_tcp_queue *queue)
 {
     struct socket *sock = queue->sock;
     struct sock *sk = sock->sk;
     read_descriptor_t rd_desc;
     int consumed;
 
     rd_desc.arg.data = queue;
     rd_desc.count = 1;
     lock_sock(sk);
     queue->nr_cqe = 0;
     consumed = sock->ops->read_sock(sk, &rd_desc, nvme_tcp_recv_skb);
     release_sock(sk);
     return consumed;
 }
 
 static void nvme_tcp_io_work(struct work_struct *w)
 {
     struct nvme_tcp_queue *queue =
         container_of(w, struct nvme_tcp_queue, io_work);
     unsigned long deadline = jiffies + msecs_to_jiffies(1);
 
     do {
         bool pending = false;
         int result;
 
         if (mutex_trylock(&queue->send_mutex)) {
             result = nvme_tcp_try_send(queue);
             mutex_unlock(&queue->send_mutex);
             if (result > 0)
                 pending = true;
             else if (unlikely(result < 0))
                 break;
         }
 
         result = nvme_tcp_try_recv(queue);
         if (result > 0)
             pending = true;
         else if (unlikely(result < 0))
             return;
 
         if (!pending || !queue->rd_enabled)
             return;
 
     } while (!time_after(jiffies, deadline)); /* quota is exhausted */
 
     queue_work_on(queue->io_cpu, nvme_tcp_wq, &queue->io_work);
 }
 
 static void nvme_tcp_free_crypto(struct nvme_tcp_queue *queue)
 {
     struct crypto_ahash *tfm = crypto_ahash_reqtfm(queue->rcv_hash);
 
     ahash_request_free(queue->rcv_hash);
     ahash_request_free(queue->snd_hash);
     crypto_free_ahash(tfm);
 }
 
 static int nvme_tcp_alloc_crypto(struct nvme_tcp_queue *queue)
 {
     struct crypto_ahash *tfm;
 
     tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
     if (IS_ERR(tfm))
         return PTR_ERR(tfm);
 
     queue->snd_hash = ahash_request_alloc(tfm, GFP_KERNEL);
     if (!queue->snd_hash)
         goto free_tfm;
     ahash_request_set_callback(queue->snd_hash, 0, NULL, NULL);
 
     queue->rcv_hash = ahash_request_alloc(tfm, GFP_KERNEL);
     if (!queue->rcv_hash)
         goto free_snd_hash;
     ahash_request_set_callback(queue->rcv_hash, 0, NULL, NULL);
 
     return 0;
 free_snd_hash:
     ahash_request_free(queue->snd_hash);
 free_tfm:
     crypto_free_ahash(tfm);
     return -ENOMEM;
 }
 
 static void nvme_tcp_free_async_req(struct nvme_tcp_ctrl *ctrl)
 {
     struct nvme_tcp_request *async = &ctrl->async_req;
 
     page_frag_free(async->pdu);
 }
 
 static int nvme_tcp_alloc_async_req(struct nvme_tcp_ctrl *ctrl)
 {
     struct nvme_tcp_queue *queue = &ctrl->queues[0];
     struct nvme_tcp_request *async = &ctrl->async_req;
     u8 hdgst = nvme_tcp_hdgst_len(queue);
 
     async->pdu = page_frag_alloc(&queue->pf_cache,
         sizeof(struct nvme_tcp_cmd_pdu) + hdgst,
         GFP_KERNEL | __GFP_ZERO);
     if (!async->pdu)
         return -ENOMEM;
 
     async->queue = &ctrl->queues[0];
     return 0;
 }
 
 static void nvme_tcp_free_queue(struct nvme_ctrl *nctrl, int qid)
 {
     struct page *page;
     struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl);
     struct nvme_tcp_queue *queue = &ctrl->queues[qid];
 
     if (!test_and_clear_bit(NVME_TCP_Q_ALLOCATED, &queue->flags))
         return;
 
     if (queue->hdr_digest || queue->data_digest)
         nvme_tcp_free_crypto(queue);
 
     if (queue->pf_cache.va) {
         page = virt_to_head_page(queue->pf_cache.va);
         __page_frag_cache_drain(page, queue->pf_cache.pagecnt_bias);
         queue->pf_cache.va = NULL;
     }
     sock_release(queue->sock);
     kfree(queue->pdu);
     mutex_destroy(&queue->send_mutex);
     mutex_destroy(&queue->queue_lock);
 }
 
 static int nvme_tcp_init_connection(struct nvme_tcp_queue *queue)
 {
     struct nvme_tcp_icreq_pdu *icreq;
     struct nvme_tcp_icresp_pdu *icresp;
     struct msghdr msg = {};
     struct kvec iov;
     bool ctrl_hdgst, ctrl_ddgst;
     u32 maxh2cdata;
     int ret;
 
     icreq = kzalloc(sizeof(*icreq), GFP_KERNEL);
     if (!icreq)
         return -ENOMEM;
 
     icresp = kzalloc(sizeof(*icresp), GFP_KERNEL);
     if (!icresp) {
         ret = -ENOMEM;
         goto free_icreq;
     }
 
     icreq->hdr.type = nvme_tcp_icreq;
     icreq->hdr.hlen = sizeof(*icreq);
     icreq->hdr.pdo = 0;
     icreq->hdr.plen = cpu_to_le32(icreq->hdr.hlen);
     icreq->pfv = cpu_to_le16(NVME_TCP_PFV_1_0);
     icreq->maxr2t = 0; /* single inflight r2t supported */
     icreq->hpda = 0; /* no alignment constraint */
     if (queue->hdr_digest)
         icreq->digest |= NVME_TCP_HDR_DIGEST_ENABLE;
     if (queue->data_digest)
         icreq->digest |= NVME_TCP_DATA_DIGEST_ENABLE;
 
     iov.iov_base = icreq;
     iov.iov_len = sizeof(*icreq);
     ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len);
     if (ret < 0)
         goto free_icresp;
 
     memset(&msg, 0, sizeof(msg));
     iov.iov_base = icresp;
     iov.iov_len = sizeof(*icresp);
     ret = kernel_recvmsg(queue->sock, &msg, &iov, 1,
             iov.iov_len, msg.msg_flags);
     if (ret < 0)
         goto free_icresp;
 
     ret = -EINVAL;
     if (icresp->hdr.type != nvme_tcp_icresp) {
         pr_err("queue %d: bad type returned %d\n",
             nvme_tcp_queue_id(queue), icresp->hdr.type);
         goto free_icresp;
     }
 
     if (le32_to_cpu(icresp->hdr.plen) != sizeof(*icresp)) {
         pr_err("queue %d: bad pdu length returned %d\n",
             nvme_tcp_queue_id(queue), icresp->hdr.plen);
         goto free_icresp;
     }
 
     if (icresp->pfv != NVME_TCP_PFV_1_0) {
         pr_err("queue %d: bad pfv returned %d\n",
             nvme_tcp_queue_id(queue), icresp->pfv);
         goto free_icresp;
     }
 
     ctrl_ddgst = !!(icresp->digest & NVME_TCP_DATA_DIGEST_ENABLE);
     if ((queue->data_digest && !ctrl_ddgst) ||
         (!queue->data_digest && ctrl_ddgst)) {
         pr_err("queue %d: data digest mismatch host: %s ctrl: %s\n",
             nvme_tcp_queue_id(queue),
             queue->data_digest ? "enabled" : "disabled",
             ctrl_ddgst ? "enabled" : "disabled");
         goto free_icresp;
     }
 
     ctrl_hdgst = !!(icresp->digest & NVME_TCP_HDR_DIGEST_ENABLE);
     if ((queue->hdr_digest && !ctrl_hdgst) ||
         (!queue->hdr_digest && ctrl_hdgst)) {
         pr_err("queue %d: header digest mismatch host: %s ctrl: %s\n",
             nvme_tcp_queue_id(queue),
             queue->hdr_digest ? "enabled" : "disabled",
             ctrl_hdgst ? "enabled" : "disabled");
         goto free_icresp;
     }
 
     if (icresp->cpda != 0) {
         pr_err("queue %d: unsupported cpda returned %d\n",
             nvme_tcp_queue_id(queue), icresp->cpda);
         goto free_icresp;
     }
 
     maxh2cdata = le32_to_cpu(icresp->maxdata);
     if ((maxh2cdata % 4) || (maxh2cdata < NVME_TCP_MIN_MAXH2CDATA)) {
         pr_err("queue %d: invalid maxh2cdata returned %u\n",
                nvme_tcp_queue_id(queue), maxh2cdata);
         goto free_icresp;
     }
     queue->maxh2cdata = maxh2cdata;
 
     ret = 0;
 free_icresp:
     kfree(icresp);
 free_icreq:
     kfree(icreq);
     return ret;
 }
 
 static bool nvme_tcp_admin_queue(struct nvme_tcp_queue *queue)
 {
     return nvme_tcp_queue_id(queue) == 0;
 }
 
 static bool nvme_tcp_default_queue(struct nvme_tcp_queue *queue)
 {
     struct nvme_tcp_ctrl *ctrl = queue->ctrl;
     int qid = nvme_tcp_queue_id(queue);
 
     return !nvme_tcp_admin_queue(queue) &&
         qid < 1 + ctrl->io_queues[HCTX_TYPE_DEFAULT];
 }
 
 static bool nvme_tcp_read_queue(struct nvme_tcp_queue *queue)
 {
     struct nvme_tcp_ctrl *ctrl = queue->ctrl;
     int qid = nvme_tcp_queue_id(queue);
 
     return !nvme_tcp_admin_queue(queue) &&
         !nvme_tcp_default_queue(queue) &&
         qid < 1 + ctrl->io_queues[HCTX_TYPE_DEFAULT] +
               ctrl->io_queues[HCTX_TYPE_READ];
 }
 
 static bool nvme_tcp_poll_queue(struct nvme_tcp_queue *queue)
 {
     struct nvme_tcp_ctrl *ctrl = queue->ctrl;
     int qid = nvme_tcp_queue_id(queue);
 
     return !nvme_tcp_admin_queue(queue) &&
         !nvme_tcp_default_queue(queue) &&
         !nvme_tcp_read_queue(queue) &&
         qid < 1 + ctrl->io_queues[HCTX_TYPE_DEFAULT] +
               ctrl->io_queues[HCTX_TYPE_READ] +
               ctrl->io_queues[HCTX_TYPE_POLL];
 }
 
 static void nvme_tcp_set_queue_io_cpu(struct nvme_tcp_queue *queue)
 {
     struct nvme_tcp_ctrl *ctrl = queue->ctrl;
     int qid = nvme_tcp_queue_id(queue);
     int n = 0;
 
     if (nvme_tcp_default_queue(queue))
         n = qid - 1;
     else if (nvme_tcp_read_queue(queue))
         n = qid - ctrl->io_queues[HCTX_TYPE_DEFAULT] - 1;
     else if (nvme_tcp_poll_queue(queue))
         n = qid - ctrl->io_queues[HCTX_TYPE_DEFAULT] -
                 ctrl->io_queues[HCTX_TYPE_READ] - 1;
     queue->io_cpu = cpumask_next_wrap(n - 1, cpu_online_mask, -1, false);
 }
 
 static int nvme_tcp_alloc_queue(struct nvme_ctrl *nctrl,
         int qid, size_t queue_size)
 {
     struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl);
     struct nvme_tcp_queue *queue = &ctrl->queues[qid];
     int ret, rcv_pdu_size;
 
     mutex_init(&queue->queue_lock);
     queue->ctrl = ctrl;
     init_llist_head(&queue->req_list);
     INIT_LIST_HEAD(&queue->send_list);
     mutex_init(&queue->send_mutex);
     INIT_WORK(&queue->io_work, nvme_tcp_io_work);
     queue->queue_size = queue_size;
 
     if (qid > 0)
         queue->cmnd_capsule_len = nctrl->ioccsz * 16;
     else
         queue->cmnd_capsule_len = sizeof(struct nvme_command) +
                         NVME_TCP_ADMIN_CCSZ;
 
     ret = sock_create(ctrl->addr.ss_family, SOCK_STREAM,
             IPPROTO_TCP, &queue->sock);
     if (ret) {
         dev_err(nctrl->device,
             "failed to create socket: %d\n", ret);
         goto err_destroy_mutex;
     }
 
     nvme_tcp_reclassify_socket(queue->sock);
 
     /* Single syn retry */
     tcp_sock_set_syncnt(queue->sock->sk, 1);
 
     /* Set TCP no delay */
     tcp_sock_set_nodelay(queue->sock->sk);
 
     /*
      * Cleanup whatever is sitting in the TCP transmit queue on socket
      * close. This is done to prevent stale data from being sent should
      * the network connection be restored before TCP times out.
      */
     sock_no_linger(queue->sock->sk);
 
     if (so_priority > 0)
         sock_set_priority(queue->sock->sk, so_priority);
 
     /* Set socket type of service */
     if (nctrl->opts->tos >= 0)
         ip_sock_set_tos(queue->sock->sk, nctrl->opts->tos);
 
     /* Set 10 seconds timeout for icresp recvmsg */
     queue->sock->sk->sk_rcvtimeo = 10 * HZ;
 
     queue->sock->sk->sk_allocation = GFP_ATOMIC;
     nvme_tcp_set_queue_io_cpu(queue);
     queue->request = NULL;
     queue->data_remaining = 0;
     queue->ddgst_remaining = 0;
     queue->pdu_remaining = 0;
     queue->pdu_offset = 0;
     sk_set_memalloc(queue->sock->sk);
 
     if (nctrl->opts->mask & NVMF_OPT_HOST_TRADDR) {
         ret = kernel_bind(queue->sock, (struct sockaddr *)&ctrl->src_addr,
             sizeof(ctrl->src_addr));
         if (ret) {
             dev_err(nctrl->device,
                 "failed to bind queue %d socket %d\n",
                 qid, ret);
             goto err_sock;
         }
     }
 
     if (nctrl->opts->mask & NVMF_OPT_HOST_IFACE) {
         char *iface = nctrl->opts->host_iface;
         sockptr_t optval = KERNEL_SOCKPTR(iface);
 
         ret = sock_setsockopt(queue->sock, SOL_SOCKET, SO_BINDTODEVICE,
                       optval, strlen(iface));
         if (ret) {
             dev_err(nctrl->device,
               "failed to bind to interface %s queue %d err %d\n",
               iface, qid, ret);
             goto err_sock;
         }
     }
 
     queue->hdr_digest = nctrl->opts->hdr_digest;
     queue->data_digest = nctrl->opts->data_digest;
     if (queue->hdr_digest || queue->data_digest) {
         ret = nvme_tcp_alloc_crypto(queue);
         if (ret) {
             dev_err(nctrl->device,
                 "failed to allocate queue %d crypto\n", qid);
             goto err_sock;
         }
     }
 
     rcv_pdu_size = sizeof(struct nvme_tcp_rsp_pdu) +
             nvme_tcp_hdgst_len(queue);
     queue->pdu = kmalloc(rcv_pdu_size, GFP_KERNEL);
     if (!queue->pdu) {
         ret = -ENOMEM;
         goto err_crypto;
     }
 
     dev_dbg(nctrl->device, "connecting queue %d\n",
             nvme_tcp_queue_id(queue));
 
     ret = kernel_connect(queue->sock, (struct sockaddr *)&ctrl->addr,
         sizeof(ctrl->addr), 0);
     if (ret) {
         dev_err(nctrl->device,
             "failed to connect socket: %d\n", ret);
         goto err_rcv_pdu;
     }
 
     ret = nvme_tcp_init_connection(queue);
     if (ret)
         goto err_init_connect;
 
     queue->rd_enabled = true;
     set_bit(NVME_TCP_Q_ALLOCATED, &queue->flags);
     nvme_tcp_init_recv_ctx(queue);
 
     write_lock_bh(&queue->sock->sk->sk_callback_lock);
     queue->sock->sk->sk_user_data = queue;
     queue->state_change = queue->sock->sk->sk_state_change;
     queue->data_ready = queue->sock->sk->sk_data_ready;
     queue->write_space = queue->sock->sk->sk_write_space;
     queue->sock->sk->sk_data_ready = nvme_tcp_data_ready;
     queue->sock->sk->sk_state_change = nvme_tcp_state_change;
     queue->sock->sk->sk_write_space = nvme_tcp_write_space;
 #ifdef CONFIG_NET_RX_BUSY_POLL
     queue->sock->sk->sk_ll_usec = 1;
 #endif
     write_unlock_bh(&queue->sock->sk->sk_callback_lock);
 
     return 0;
 
 err_init_connect:
     kernel_sock_shutdown(queue->sock, SHUT_RDWR);
 err_rcv_pdu:
     kfree(queue->pdu);
 err_crypto:
     if (queue->hdr_digest || queue->data_digest)
         nvme_tcp_free_crypto(queue);
 err_sock:
     sock_release(queue->sock);
     queue->sock = NULL;
 err_destroy_mutex:
     mutex_destroy(&queue->send_mutex);
     mutex_destroy(&queue->queue_lock);
     return ret;
 }
 
 static void nvme_tcp_restore_sock_calls(struct nvme_tcp_queue *queue)
 {
     struct socket *sock = queue->sock;
 
     write_lock_bh(&sock->sk->sk_callback_lock);
     sock->sk->sk_user_data  = NULL;
     sock->sk->sk_data_ready = queue->data_ready;
     sock->sk->sk_state_change = queue->state_change;
     sock->sk->sk_write_space  = queue->write_space;
     write_unlock_bh(&sock->sk->sk_callback_lock);
 }
 
 static void __nvme_tcp_stop_queue(struct nvme_tcp_queue *queue)
 {
     kernel_sock_shutdown(queue->sock, SHUT_RDWR);
     nvme_tcp_restore_sock_calls(queue);
     cancel_work_sync(&queue->io_work);
 }
 
 static void nvme_tcp_stop_queue(struct nvme_ctrl *nctrl, int qid)
 {
     struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl);
     struct nvme_tcp_queue *queue = &ctrl->queues[qid];
 
     if (!test_bit(NVME_TCP_Q_ALLOCATED, &queue->flags))
         return;
 
     mutex_lock(&queue->queue_lock);
     if (test_and_clear_bit(NVME_TCP_Q_LIVE, &queue->flags))
         __nvme_tcp_stop_queue(queue);
     mutex_unlock(&queue->queue_lock);
 }
 
 static int nvme_tcp_start_queue(struct nvme_ctrl *nctrl, int idx)
 {
     struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl);
     int ret;
 
     if (idx)
         ret = nvmf_connect_io_queue(nctrl, idx);
     else
         ret = nvmf_connect_admin_queue(nctrl);
 
     if (!ret) {
         set_bit(NVME_TCP_Q_LIVE, &ctrl->queues[idx].flags);
     } else {
         if (test_bit(NVME_TCP_Q_ALLOCATED, &ctrl->queues[idx].flags))
             __nvme_tcp_stop_queue(&ctrl->queues[idx]);
         dev_err(nctrl->device,
             "failed to connect queue: %d ret=%d\n", idx, ret);
     }
     return ret;
 }
 
 static int nvme_tcp_alloc_admin_tag_set(struct nvme_ctrl *nctrl)
 {
     struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl);
     struct blk_mq_tag_set *set = &ctrl->admin_tag_set;
     int ret;
 
     memset(set, 0, sizeof(*set));
     set->ops = &nvme_tcp_admin_mq_ops;
     set->queue_depth = NVME_AQ_MQ_TAG_DEPTH;
     set->reserved_tags = NVMF_RESERVED_TAGS;
     set->numa_node = nctrl->numa_node;
     set->flags = BLK_MQ_F_BLOCKING;
     set->cmd_size = sizeof(struct nvme_tcp_request);
     set->driver_data = ctrl;
     set->nr_hw_queues = 1;
     set->timeout = NVME_ADMIN_TIMEOUT;
     ret = blk_mq_alloc_tag_set(set);
     if (!ret)
         nctrl->admin_tagset = set;
     return ret;
 }
 
 static int nvme_tcp_alloc_tag_set(struct nvme_ctrl *nctrl)
 {
     struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl);
     struct blk_mq_tag_set *set = &ctrl->tag_set;
     int ret;
 
     memset(set, 0, sizeof(*set));
     set->ops = &nvme_tcp_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 | BLK_MQ_F_BLOCKING;
     set->cmd_size = sizeof(struct nvme_tcp_request);
     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)
         nctrl->tagset = set;
     return ret;
 }
 
 static void nvme_tcp_free_admin_queue(struct nvme_ctrl *ctrl)
 {
     if (to_tcp_ctrl(ctrl)->async_req.pdu) {
         cancel_work_sync(&ctrl->async_event_work);
         nvme_tcp_free_async_req(to_tcp_ctrl(ctrl));
         to_tcp_ctrl(ctrl)->async_req.pdu = NULL;
     }
 
     nvme_tcp_free_queue(ctrl, 0);
 }
 
 static void nvme_tcp_free_io_queues(struct nvme_ctrl *ctrl)
 {
     int i;
 
     for (i = 1; i < ctrl->queue_count; i++)
         nvme_tcp_free_queue(ctrl, i);
 }
 
 static void nvme_tcp_stop_io_queues(struct nvme_ctrl *ctrl)
 {
     int i;
 
     for (i = 1; i < ctrl->queue_count; i++)
         nvme_tcp_stop_queue(ctrl, i);
 }
 
 static int nvme_tcp_start_io_queues(struct nvme_ctrl *ctrl)
 {
     int i, ret;
 
     for (i = 1; i < ctrl->queue_count; i++) {
         ret = nvme_tcp_start_queue(ctrl, i);
         if (ret)
             goto out_stop_queues;
     }
 
     return 0;
 
 out_stop_queues:
     for (i--; i >= 1; i--)
         nvme_tcp_stop_queue(ctrl, i);
     return ret;
 }
 
 static int nvme_tcp_alloc_admin_queue(struct nvme_ctrl *ctrl)
 {
     int ret;
 
     ret = nvme_tcp_alloc_queue(ctrl, 0, NVME_AQ_DEPTH);
     if (ret)
         return ret;
 
     ret = nvme_tcp_alloc_async_req(to_tcp_ctrl(ctrl));
     if (ret)
         goto out_free_queue;
 
     return 0;
 
 out_free_queue:
     nvme_tcp_free_queue(ctrl, 0);
     return ret;
 }
 
 static int __nvme_tcp_alloc_io_queues(struct nvme_ctrl *ctrl)
 {
     int i, ret;
 
     for (i = 1; i < ctrl->queue_count; i++) {
         ret = nvme_tcp_alloc_queue(ctrl, i, ctrl->sqsize + 1);
         if (ret)
             goto out_free_queues;
     }
 
     return 0;
 
 out_free_queues:
     for (i--; i >= 1; i--)
         nvme_tcp_free_queue(ctrl, i);
 
     return ret;
 }
 
 static unsigned int nvme_tcp_nr_io_queues(struct nvme_ctrl *ctrl)
 {
     unsigned int nr_io_queues;
 
     nr_io_queues = min(ctrl->opts->nr_io_queues, num_online_cpus());
     nr_io_queues += min(ctrl->opts->nr_write_queues, num_online_cpus());
     nr_io_queues += min(ctrl->opts->nr_poll_queues, num_online_cpus());
 
     return nr_io_queues;
 }
 
 static void nvme_tcp_set_io_queues(struct nvme_ctrl *nctrl,
         unsigned int nr_io_queues)
 {
     struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl);
     struct nvmf_ctrl_options *opts = nctrl->opts;
 
     if (opts->nr_write_queues && opts->nr_io_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] = opts->nr_io_queues;
         nr_io_queues -= ctrl->io_queues[HCTX_TYPE_READ];
         ctrl->io_queues[HCTX_TYPE_DEFAULT] =
             min(opts->nr_write_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(opts->nr_io_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(opts->nr_poll_queues, nr_io_queues);
     }
 }
 
 static int nvme_tcp_alloc_io_queues(struct nvme_ctrl *ctrl)
 {
     unsigned int nr_io_queues;
     int ret;
 
     nr_io_queues = nvme_tcp_nr_io_queues(ctrl);
     ret = nvme_set_queue_count(ctrl, &nr_io_queues);
     if (ret)
         return ret;
 
     if (nr_io_queues == 0) {
         dev_err(ctrl->device,
             "unable to set any I/O queues\n");
         return -ENOMEM;
     }
 
     ctrl->queue_count = nr_io_queues + 1;
     dev_info(ctrl->device,
         "creating %d I/O queues.\n", nr_io_queues);
 
     nvme_tcp_set_io_queues(ctrl, nr_io_queues);
 
     return __nvme_tcp_alloc_io_queues(ctrl);
 }
 
 static void nvme_tcp_destroy_io_queues(struct nvme_ctrl *ctrl, bool remove)
 {
     nvme_tcp_stop_io_queues(ctrl);
     if (remove) {
         blk_mq_destroy_queue(ctrl->connect_q);
         blk_mq_free_tag_set(ctrl->tagset);
     }
     nvme_tcp_free_io_queues(ctrl);
 }
 
 static int nvme_tcp_configure_io_queues(struct nvme_ctrl *ctrl, bool new)
 {
     int ret;
 
     ret = nvme_tcp_alloc_io_queues(ctrl);
     if (ret)
         return ret;
 
     if (new) {
         ret = nvme_tcp_alloc_tag_set(ctrl);
         if (ret)
             goto out_free_io_queues;
 
         ret = nvme_ctrl_init_connect_q(ctrl);
         if (ret)
             goto out_free_tag_set;
     }
 
     ret = nvme_tcp_start_io_queues(ctrl);
     if (ret)
         goto out_cleanup_connect_q;
 
     if (!new) {
         nvme_start_queues(ctrl);
         if (!nvme_wait_freeze_timeout(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->tagset,
             ctrl->queue_count - 1);
         nvme_unfreeze(ctrl);
     }
 
     return 0;
 
 out_wait_freeze_timed_out:
     nvme_stop_queues(ctrl);
     nvme_sync_io_queues(ctrl);
     nvme_tcp_stop_io_queues(ctrl);
 out_cleanup_connect_q:
     nvme_cancel_tagset(ctrl);
     if (new)
         blk_mq_destroy_queue(ctrl->connect_q);
 out_free_tag_set:
     if (new)
         blk_mq_free_tag_set(ctrl->tagset);
 out_free_io_queues:
     nvme_tcp_free_io_queues(ctrl);
     return ret;
 }
 
 static void nvme_tcp_destroy_admin_queue(struct nvme_ctrl *ctrl, bool remove)
 {
     nvme_tcp_stop_queue(ctrl, 0);
     if (remove) {
         blk_mq_destroy_queue(ctrl->admin_q);
         blk_mq_destroy_queue(ctrl->fabrics_q);
         blk_mq_free_tag_set(ctrl->admin_tagset);
     }
     nvme_tcp_free_admin_queue(ctrl);
 }
 
 static int nvme_tcp_configure_admin_queue(struct nvme_ctrl *ctrl, bool new)
 {
     int error;
 
     error = nvme_tcp_alloc_admin_queue(ctrl);
     if (error)
         return error;
 
     if (new) {
         error = nvme_tcp_alloc_admin_tag_set(ctrl);
         if (error)
             goto out_free_queue;
 
         ctrl->fabrics_q = blk_mq_init_queue(ctrl->admin_tagset);
         if (IS_ERR(ctrl->fabrics_q)) {
             error = PTR_ERR(ctrl->fabrics_q);
             goto out_free_tagset;
         }
 
         ctrl->admin_q = blk_mq_init_queue(ctrl->admin_tagset);
         if (IS_ERR(ctrl->admin_q)) {
             error = PTR_ERR(ctrl->admin_q);
             goto out_cleanup_fabrics_q;
         }
     }
 
     error = nvme_tcp_start_queue(ctrl, 0);
     if (error)
         goto out_cleanup_queue;
 
     error = nvme_enable_ctrl(ctrl);
     if (error)
         goto out_stop_queue;
 
     nvme_start_admin_queue(ctrl);
 
     error = nvme_init_ctrl_finish(ctrl);
     if (error)
         goto out_quiesce_queue;
 
     return 0;
 
 out_quiesce_queue:
     nvme_stop_admin_queue(ctrl);
     blk_sync_queue(ctrl->admin_q);
 out_stop_queue:
     nvme_tcp_stop_queue(ctrl, 0);
     nvme_cancel_admin_tagset(ctrl);
 out_cleanup_queue:
     if (new)
         blk_mq_destroy_queue(ctrl->admin_q);
 out_cleanup_fabrics_q:
     if (new)
         blk_mq_destroy_queue(ctrl->fabrics_q);
 out_free_tagset:
     if (new)
         blk_mq_free_tag_set(ctrl->admin_tagset);
 out_free_queue:
     nvme_tcp_free_admin_queue(ctrl);
     return error;
 }
 
 static void nvme_tcp_teardown_admin_queue(struct nvme_ctrl *ctrl,
         bool remove)
 {
     nvme_stop_admin_queue(ctrl);
     blk_sync_queue(ctrl->admin_q);
     nvme_tcp_stop_queue(ctrl, 0);
     nvme_cancel_admin_tagset(ctrl);
     if (remove)
         nvme_start_admin_queue(ctrl);
     nvme_tcp_destroy_admin_queue(ctrl, remove);
 }
 
 static void nvme_tcp_teardown_io_queues(struct nvme_ctrl *ctrl,
         bool remove)
 {
     if (ctrl->queue_count <= 1)
         return;
     nvme_stop_admin_queue(ctrl);
     nvme_start_freeze(ctrl);
     nvme_stop_queues(ctrl);
     nvme_sync_io_queues(ctrl);
     nvme_tcp_stop_io_queues(ctrl);
     nvme_cancel_tagset(ctrl);
     if (remove)
         nvme_start_queues(ctrl);
     nvme_tcp_destroy_io_queues(ctrl, remove);
 }
 
 static void nvme_tcp_reconnect_or_remove(struct nvme_ctrl *ctrl)
 {
     /* If we are resetting/deleting then do nothing */
     if (ctrl->state != NVME_CTRL_CONNECTING) {
         WARN_ON_ONCE(ctrl->state == NVME_CTRL_NEW ||
             ctrl->state == NVME_CTRL_LIVE);
         return;
     }
 
     if (nvmf_should_reconnect(ctrl)) {
         dev_info(ctrl->device, "Reconnecting in %d seconds...\n",
             ctrl->opts->reconnect_delay);
         queue_delayed_work(nvme_wq, &to_tcp_ctrl(ctrl)->connect_work,
                 ctrl->opts->reconnect_delay * HZ);
     } else {
         dev_info(ctrl->device, "Removing controller...\n");
         nvme_delete_ctrl(ctrl);
     }
 }
 
 static int nvme_tcp_setup_ctrl(struct nvme_ctrl *ctrl, bool new)
 {
     struct nvmf_ctrl_options *opts = ctrl->opts;
     int ret;
 
     ret = nvme_tcp_configure_admin_queue(ctrl, new);
     if (ret)
         return ret;
 
     if (ctrl->icdoff) {
         ret = -EOPNOTSUPP;
         dev_err(ctrl->device, "icdoff is not supported!\n");
         goto destroy_admin;
     }
 
     if (!nvme_ctrl_sgl_supported(ctrl)) {
         ret = -EOPNOTSUPP;
         dev_err(ctrl->device, "Mandatory sgls are not supported!\n");
         goto destroy_admin;
     }
 
     if (opts->queue_size > ctrl->sqsize + 1)
         dev_warn(ctrl->device,
             "queue_size %zu > ctrl sqsize %u, clamping down\n",
             opts->queue_size, ctrl->sqsize + 1);
 
     if (ctrl->sqsize + 1 > ctrl->maxcmd) {
         dev_warn(ctrl->device,
             "sqsize %u > ctrl maxcmd %u, clamping down\n",
             ctrl->sqsize + 1, ctrl->maxcmd);
         ctrl->sqsize = ctrl->maxcmd - 1;
     }
 
     if (ctrl->queue_count > 1) {
         ret = nvme_tcp_configure_io_queues(ctrl, new);
         if (ret)
             goto destroy_admin;
     }
 
     if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_LIVE)) {
         /*
          * 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->state != NVME_CTRL_DELETING &&
                  ctrl->state != NVME_CTRL_DELETING_NOIO);
         WARN_ON_ONCE(new);
         ret = -EINVAL;
         goto destroy_io;
     }
 
     nvme_start_ctrl(ctrl);
     return 0;
 
 destroy_io:
     if (ctrl->queue_count > 1) {
         nvme_stop_queues(ctrl);
         nvme_sync_io_queues(ctrl);
         nvme_tcp_stop_io_queues(ctrl);
         nvme_cancel_tagset(ctrl);
         nvme_tcp_destroy_io_queues(ctrl, new);
     }
 destroy_admin:
     nvme_stop_admin_queue(ctrl);
     blk_sync_queue(ctrl->admin_q);
     nvme_tcp_stop_queue(ctrl, 0);
     nvme_cancel_admin_tagset(ctrl);
     nvme_tcp_destroy_admin_queue(ctrl, new);
     return ret;
 }
 
 static void nvme_tcp_reconnect_ctrl_work(struct work_struct *work)
 {
     struct nvme_tcp_ctrl *tcp_ctrl = container_of(to_delayed_work(work),
             struct nvme_tcp_ctrl, connect_work);
     struct nvme_ctrl *ctrl = &tcp_ctrl->ctrl;
 
     ++ctrl->nr_reconnects;
 
     if (nvme_tcp_setup_ctrl(ctrl, false))
         goto requeue;
 
     dev_info(ctrl->device, "Successfully reconnected (%d attempt)\n",
             ctrl->nr_reconnects);
 
     ctrl->nr_reconnects = 0;
 
     return;
 
 requeue:
     dev_info(ctrl->device, "Failed reconnect attempt %d\n",
             ctrl->nr_reconnects);
     nvme_tcp_reconnect_or_remove(ctrl);
 }
 
 static void nvme_tcp_error_recovery_work(struct work_struct *work)
 {
     struct nvme_tcp_ctrl *tcp_ctrl = container_of(work,
                 struct nvme_tcp_ctrl, err_work);
     struct nvme_ctrl *ctrl = &tcp_ctrl->ctrl;
 
     nvme_auth_stop(ctrl);
     nvme_stop_keep_alive(ctrl);
     flush_work(&ctrl->async_event_work);
     nvme_tcp_teardown_io_queues(ctrl, false);
     /* unquiesce to fail fast pending requests */
     nvme_start_queues(ctrl);
     nvme_tcp_teardown_admin_queue(ctrl, false);
     nvme_start_admin_queue(ctrl);
 
     if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_CONNECTING)) {
         /* state change failure is ok if we started ctrl delete */
         WARN_ON_ONCE(ctrl->state != NVME_CTRL_DELETING &&
                  ctrl->state != NVME_CTRL_DELETING_NOIO);
         return;
     }
 
     nvme_tcp_reconnect_or_remove(ctrl);
 }
 
 static void nvme_tcp_teardown_ctrl(struct nvme_ctrl *ctrl, bool shutdown)
 {
     nvme_tcp_teardown_io_queues(ctrl, shutdown);
     nvme_stop_admin_queue(ctrl);
     if (shutdown)
         nvme_shutdown_ctrl(ctrl);
     else
         nvme_disable_ctrl(ctrl);
     nvme_tcp_teardown_admin_queue(ctrl, shutdown);
 }
 
 static void nvme_tcp_delete_ctrl(struct nvme_ctrl *ctrl)
 {
     nvme_tcp_teardown_ctrl(ctrl, true);
 }
 
 static void nvme_reset_ctrl_work(struct work_struct *work)
 {
     struct nvme_ctrl *ctrl =
         container_of(work, struct nvme_ctrl, reset_work);
 
     nvme_stop_ctrl(ctrl);
     nvme_tcp_teardown_ctrl(ctrl, false);
 
     if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_CONNECTING)) {
         /* state change failure is ok if we started ctrl delete */
         WARN_ON_ONCE(ctrl->state != NVME_CTRL_DELETING &&
                  ctrl->state != NVME_CTRL_DELETING_NOIO);
         return;
     }
 
     if (nvme_tcp_setup_ctrl(ctrl, false))
         goto out_fail;
 
     return;
 
 out_fail:
     ++ctrl->nr_reconnects;
     nvme_tcp_reconnect_or_remove(ctrl);
 }
 
 static void nvme_tcp_stop_ctrl(struct nvme_ctrl *ctrl)
 {
     cancel_work_sync(&to_tcp_ctrl(ctrl)->err_work);
     cancel_delayed_work_sync(&to_tcp_ctrl(ctrl)->connect_work);
 }
 
 static void nvme_tcp_free_ctrl(struct nvme_ctrl *nctrl)
 {
     struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl);
 
     if (list_empty(&ctrl->list))
         goto free_ctrl;
 
     mutex_lock(&nvme_tcp_ctrl_mutex);
     list_del(&ctrl->list);
     mutex_unlock(&nvme_tcp_ctrl_mutex);
 
     nvmf_free_options(nctrl->opts);
 free_ctrl:
     kfree(ctrl->queues);
     kfree(ctrl);
 }
 
 static void nvme_tcp_set_sg_null(struct nvme_command *c)
 {
     struct nvme_sgl_desc *sg = &c->common.dptr.sgl;
 
     sg->addr = 0;
     sg->length = 0;
     sg->type = (NVME_TRANSPORT_SGL_DATA_DESC << 4) |
             NVME_SGL_FMT_TRANSPORT_A;
 }
 
 static void nvme_tcp_set_sg_inline(struct nvme_tcp_queue *queue,
         struct nvme_command *c, u32 data_len)
 {
     struct nvme_sgl_desc *sg = &c->common.dptr.sgl;
 
     sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff);
     sg->length = cpu_to_le32(data_len);
     sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET;
 }
 
 static void nvme_tcp_set_sg_host_data(struct nvme_command *c,
         u32 data_len)
 {
     struct nvme_sgl_desc *sg = &c->common.dptr.sgl;
 
     sg->addr = 0;
     sg->length = cpu_to_le32(data_len);
     sg->type = (NVME_TRANSPORT_SGL_DATA_DESC << 4) |
             NVME_SGL_FMT_TRANSPORT_A;
 }
 
 static void nvme_tcp_submit_async_event(struct nvme_ctrl *arg)
 {
     struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(arg);
     struct nvme_tcp_queue *queue = &ctrl->queues[0];
     struct nvme_tcp_cmd_pdu *pdu = ctrl->async_req.pdu;
     struct nvme_command *cmd = &pdu->cmd;
     u8 hdgst = nvme_tcp_hdgst_len(queue);
 
     memset(pdu, 0, sizeof(*pdu));
     pdu->hdr.type = nvme_tcp_cmd;
     if (queue->hdr_digest)
         pdu->hdr.flags |= NVME_TCP_F_HDGST;
     pdu->hdr.hlen = sizeof(*pdu);
     pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst);
 
     cmd->common.opcode = nvme_admin_async_event;
     cmd->common.command_id = NVME_AQ_BLK_MQ_DEPTH;
     cmd->common.flags |= NVME_CMD_SGL_METABUF;
     nvme_tcp_set_sg_null(cmd);
 
     ctrl->async_req.state = NVME_TCP_SEND_CMD_PDU;
     ctrl->async_req.offset = 0;
     ctrl->async_req.curr_bio = NULL;
     ctrl->async_req.data_len = 0;
 
     nvme_tcp_queue_request(&ctrl->async_req, true, true);
 }
 
 static void nvme_tcp_complete_timed_out(struct request *rq)
 {
     struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq);
     struct nvme_ctrl *ctrl = &req->queue->ctrl->ctrl;
 
     nvme_tcp_stop_queue(ctrl, nvme_tcp_queue_id(req->queue));
     nvmf_complete_timed_out_request(rq);
 }
 
 static enum blk_eh_timer_return nvme_tcp_timeout(struct request *rq)
 {
     struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq);
     struct nvme_ctrl *ctrl = &req->queue->ctrl->ctrl;
     struct nvme_tcp_cmd_pdu *pdu = req->pdu;
 
     dev_warn(ctrl->device,
         "queue %d: timeout request %#x type %d\n",
         nvme_tcp_queue_id(req->queue), rq->tag, pdu->hdr.type);
 
     if (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_tcp_complete_timed_out(rq);
         return BLK_EH_DONE;
     }
 
     /*
      * LIVE state should trigger the normal error recovery which will
      * handle completing this request.
      */
     nvme_tcp_error_recovery(ctrl);
     return BLK_EH_RESET_TIMER;
 }
 
 static blk_status_t nvme_tcp_map_data(struct nvme_tcp_queue *queue,
             struct request *rq)
 {
     struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq);
     struct nvme_tcp_cmd_pdu *pdu = req->pdu;
     struct nvme_command *c = &pdu->cmd;
 
     c->common.flags |= NVME_CMD_SGL_METABUF;
 
     if (!blk_rq_nr_phys_segments(rq))
         nvme_tcp_set_sg_null(c);
     else if (rq_data_dir(rq) == WRITE &&
         req->data_len <= nvme_tcp_inline_data_size(req))
         nvme_tcp_set_sg_inline(queue, c, req->data_len);
     else
         nvme_tcp_set_sg_host_data(c, req->data_len);
 
     return 0;
 }
 
 static blk_status_t nvme_tcp_setup_cmd_pdu(struct nvme_ns *ns,
         struct request *rq)
 {
     struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq);
     struct nvme_tcp_cmd_pdu *pdu = req->pdu;
     struct nvme_tcp_queue *queue = req->queue;
     u8 hdgst = nvme_tcp_hdgst_len(queue), ddgst = 0;
     blk_status_t ret;
 
     ret = nvme_setup_cmd(ns, rq);
     if (ret)
         return ret;
 
     req->state = NVME_TCP_SEND_CMD_PDU;
     req->status = cpu_to_le16(NVME_SC_SUCCESS);
     req->offset = 0;
     req->data_sent = 0;
     req->pdu_len = 0;
     req->pdu_sent = 0;
     req->h2cdata_left = 0;
     req->data_len = blk_rq_nr_phys_segments(rq) ?
                 blk_rq_payload_bytes(rq) : 0;
     req->curr_bio = rq->bio;
     if (req->curr_bio && req->data_len)
         nvme_tcp_init_iter(req, rq_data_dir(rq));
 
     if (rq_data_dir(rq) == WRITE &&
         req->data_len <= nvme_tcp_inline_data_size(req))
         req->pdu_len = req->data_len;
 
     pdu->hdr.type = nvme_tcp_cmd;
     pdu->hdr.flags = 0;
     if (queue->hdr_digest)
         pdu->hdr.flags |= NVME_TCP_F_HDGST;
     if (queue->data_digest && req->pdu_len) {
         pdu->hdr.flags |= NVME_TCP_F_DDGST;
         ddgst = nvme_tcp_ddgst_len(queue);
     }
     pdu->hdr.hlen = sizeof(*pdu);
     pdu->hdr.pdo = req->pdu_len ? pdu->hdr.hlen + hdgst : 0;
     pdu->hdr.plen =
         cpu_to_le32(pdu->hdr.hlen + hdgst + req->pdu_len + ddgst);
 
     ret = nvme_tcp_map_data(queue, rq);
     if (unlikely(ret)) {
         nvme_cleanup_cmd(rq);
         dev_err(queue->ctrl->ctrl.device,
             "Failed to map data (%d)\n", ret);
         return ret;
     }
 
     return 0;
 }
 
 static void nvme_tcp_commit_rqs(struct blk_mq_hw_ctx *hctx)
 {
     struct nvme_tcp_queue *queue = hctx->driver_data;
 
     if (!llist_empty(&queue->req_list))
         queue_work_on(queue->io_cpu, nvme_tcp_wq, &queue->io_work);
 }
 
 static blk_status_t nvme_tcp_queue_rq(struct blk_mq_hw_ctx *hctx,
         const struct blk_mq_queue_data *bd)
 {
     struct nvme_ns *ns = hctx->queue->queuedata;
     struct nvme_tcp_queue *queue = hctx->driver_data;
     struct request *rq = bd->rq;
     struct nvme_tcp_request *req = blk_mq_rq_to_pdu(rq);
     bool queue_ready = test_bit(NVME_TCP_Q_LIVE, &queue->flags);
     blk_status_t ret;
 
     if (!nvme_check_ready(&queue->ctrl->ctrl, rq, queue_ready))
         return nvme_fail_nonready_command(&queue->ctrl->ctrl, rq);
 
     ret = nvme_tcp_setup_cmd_pdu(ns, rq);
     if (unlikely(ret))
         return ret;
 
     blk_mq_start_request(rq);
 
     nvme_tcp_queue_request(req, true, bd->last);
 
     return BLK_STS_OK;
 }
 
 static int nvme_tcp_map_queues(struct blk_mq_tag_set *set)
 {
     struct nvme_tcp_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_map_queues(&set->map[HCTX_TYPE_DEFAULT]);
     blk_mq_map_queues(&set->map[HCTX_TYPE_READ]);
 
     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 int nvme_tcp_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob)
 {
     struct nvme_tcp_queue *queue = hctx->driver_data;
     struct sock *sk = queue->sock->sk;
 
     if (!test_bit(NVME_TCP_Q_LIVE, &queue->flags))
         return 0;
 
     set_bit(NVME_TCP_Q_POLLING, &queue->flags);
     if (sk_can_busy_loop(sk) && skb_queue_empty_lockless(&sk->sk_receive_queue))
         sk_busy_loop(sk, true);
     nvme_tcp_try_recv(queue);
     clear_bit(NVME_TCP_Q_POLLING, &queue->flags);
     return queue->nr_cqe;
 }
 
 static const struct blk_mq_ops nvme_tcp_mq_ops = {
     .queue_rq   = nvme_tcp_queue_rq,
     .commit_rqs = nvme_tcp_commit_rqs,
     .complete   = nvme_complete_rq,
     .init_request   = nvme_tcp_init_request,
     .exit_request   = nvme_tcp_exit_request,
     .init_hctx  = nvme_tcp_init_hctx,
     .timeout    = nvme_tcp_timeout,
     .map_queues = nvme_tcp_map_queues,
     .poll       = nvme_tcp_poll,
 };
 
 static const struct blk_mq_ops nvme_tcp_admin_mq_ops = {
     .queue_rq   = nvme_tcp_queue_rq,
     .complete   = nvme_complete_rq,
     .init_request   = nvme_tcp_init_request,
     .exit_request   = nvme_tcp_exit_request,
     .init_hctx  = nvme_tcp_init_admin_hctx,
     .timeout    = nvme_tcp_timeout,
 };
 
 static const struct nvme_ctrl_ops nvme_tcp_ctrl_ops = {
     .name           = "tcp",
     .module         = THIS_MODULE,
     .flags          = NVME_F_FABRICS,
     .reg_read32     = nvmf_reg_read32,
     .reg_read64     = nvmf_reg_read64,
     .reg_write32        = nvmf_reg_write32,
     .free_ctrl      = nvme_tcp_free_ctrl,
     .submit_async_event = nvme_tcp_submit_async_event,
     .delete_ctrl        = nvme_tcp_delete_ctrl,
     .get_address        = nvmf_get_address,
     .stop_ctrl      = nvme_tcp_stop_ctrl,
 };
 
 static bool
 nvme_tcp_existing_controller(struct nvmf_ctrl_options *opts)
 {
     struct nvme_tcp_ctrl *ctrl;
     bool found = false;
 
     mutex_lock(&nvme_tcp_ctrl_mutex);
     list_for_each_entry(ctrl, &nvme_tcp_ctrl_list, list) {
         found = nvmf_ip_options_match(&ctrl->ctrl, opts);
         if (found)
             break;
     }
     mutex_unlock(&nvme_tcp_ctrl_mutex);
 
     return found;
 }
 
 static struct nvme_ctrl *nvme_tcp_create_ctrl(struct device *dev,
         struct nvmf_ctrl_options *opts)
 {
     struct nvme_tcp_ctrl *ctrl;
     int ret;
 
     ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
     if (!ctrl)
         return ERR_PTR(-ENOMEM);
 
     INIT_LIST_HEAD(&ctrl->list);
     ctrl->ctrl.opts = opts;
     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;
 
     INIT_DELAYED_WORK(&ctrl->connect_work,
             nvme_tcp_reconnect_ctrl_work);
     INIT_WORK(&ctrl->err_work, nvme_tcp_error_recovery_work);
     INIT_WORK(&ctrl->ctrl.reset_work, nvme_reset_ctrl_work);
 
     if (!(opts->mask & NVMF_OPT_TRSVCID)) {
         opts->trsvcid =
             kstrdup(__stringify(NVME_TCP_DISC_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->mask & NVMF_OPT_HOST_IFACE) {
         if (!__dev_get_by_name(&init_net, opts->host_iface)) {
             pr_err("invalid interface passed: %s\n",
                    opts->host_iface);
             ret = -ENODEV;
             goto out_free_ctrl;
         }
     }
 
     if (!opts->duplicate_connect && nvme_tcp_existing_controller(opts)) {
         ret = -EALREADY;
         goto out_free_ctrl;
     }
 
     ctrl->queues = kcalloc(ctrl->ctrl.queue_count, sizeof(*ctrl->queues),
                 GFP_KERNEL);
     if (!ctrl->queues) {
         ret = -ENOMEM;
         goto out_free_ctrl;
     }
 
     ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_tcp_ctrl_ops, 0);
     if (ret)
         goto out_kfree_queues;
 
     if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
         WARN_ON_ONCE(1);
         ret = -EINTR;
         goto out_uninit_ctrl;
     }
 
     ret = nvme_tcp_setup_ctrl(&ctrl->ctrl, true);
     if (ret)
         goto out_uninit_ctrl;
 
     dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISp\n",
         nvmf_ctrl_subsysnqn(&ctrl->ctrl), &ctrl->addr);
 
     mutex_lock(&nvme_tcp_ctrl_mutex);
     list_add_tail(&ctrl->list, &nvme_tcp_ctrl_list);
     mutex_unlock(&nvme_tcp_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_tcp_transport = {
     .name       = "tcp",
     .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_HDR_DIGEST | NVMF_OPT_DATA_DIGEST |
               NVMF_OPT_NR_WRITE_QUEUES | NVMF_OPT_NR_POLL_QUEUES |
               NVMF_OPT_TOS | NVMF_OPT_HOST_IFACE,
     .create_ctrl    = nvme_tcp_create_ctrl,
 };
 
 static int __init nvme_tcp_init_module(void)
 {
     nvme_tcp_wq = alloc_workqueue("nvme_tcp_wq",
             WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
     if (!nvme_tcp_wq)
         return -ENOMEM;
 
     nvmf_register_transport(&nvme_tcp_transport);
     return 0;
 }
 
 static void __exit nvme_tcp_cleanup_module(void)
 {
     struct nvme_tcp_ctrl *ctrl;
 
     nvmf_unregister_transport(&nvme_tcp_transport);
 
     mutex_lock(&nvme_tcp_ctrl_mutex);
     list_for_each_entry(ctrl, &nvme_tcp_ctrl_list, list)
         nvme_delete_ctrl(&ctrl->ctrl);
     mutex_unlock(&nvme_tcp_ctrl_mutex);
     flush_workqueue(nvme_delete_wq);
 
     destroy_workqueue(nvme_tcp_wq);
 }
 
 module_init(nvme_tcp_init_module);
 module_exit(nvme_tcp_cleanup_module);
 
 MODULE_LICENSE("GPL v2");