drivers/nvme/target/tcp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * NVMe over Fabrics TCP target.
   4  * Copyright (c) 2018 Lightbits Labs. All rights reserved.
   5  */
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7 #include <linux/module.h>
   8 #include <linux/init.h>
   9 #include <linux/slab.h>
  10 #include <linux/err.h>
  11 #include <linux/nvme-tcp.h>
  12 #include <net/sock.h>
  13 #include <net/tcp.h>
  14 #include <linux/inet.h>
  15 #include <linux/llist.h>
  16 #include <crypto/hash.h>
  17
  18 #include "nvmet.h"
  19
  20 #define NVMET_TCP_DEF_INLINE_DATA_SIZE  (4 * PAGE_SIZE)
  21
  22 /* Define the socket priority to use for connections were it is desirable
  23  * that the NIC consider performing optimized packet processing or filtering.
  24  * A non-zero value being sufficient to indicate general consideration of any
  25  * possible optimization.  Making it a module param allows for alternative
  26  * values that may be unique for some NIC implementations.
  27  */
  28 static int so_priority;
  29 module_param(so_priority, int, 0644);
  30 MODULE_PARM_DESC(so_priority, "nvmet tcp socket optimize priority");
  31
  32 /* Define a time period (in usecs) that io_work() shall sample an activated
  33  * queue before determining it to be idle.  This optional module behavior
  34  * can enable NIC solutions that support socket optimized packet processing
  35  * using advanced interrupt moderation techniques.
  36  */
  37 static int idle_poll_period_usecs;
  38 module_param(idle_poll_period_usecs, int, 0644);
  39 MODULE_PARM_DESC(idle_poll_period_usecs,
  40                 "nvmet tcp io_work poll till idle time period in usecs");
  41
  42 #define NVMET_TCP_RECV_BUDGET           8
  43 #define NVMET_TCP_SEND_BUDGET           8
  44 #define NVMET_TCP_IO_WORK_BUDGET        64
  45
  46 enum nvmet_tcp_send_state {
  47         NVMET_TCP_SEND_DATA_PDU,
  48         NVMET_TCP_SEND_DATA,
  49         NVMET_TCP_SEND_R2T,
  50         NVMET_TCP_SEND_DDGST,
  51         NVMET_TCP_SEND_RESPONSE
  52 };
  53
  54 enum nvmet_tcp_recv_state {
  55         NVMET_TCP_RECV_PDU,
  56         NVMET_TCP_RECV_DATA,
  57         NVMET_TCP_RECV_DDGST,
  58         NVMET_TCP_RECV_ERR,
  59 };
  60
  61 enum {
  62         NVMET_TCP_F_INIT_FAILED = (1 << 0),
  63 };
  64
  65 struct nvmet_tcp_cmd {
  66         struct nvmet_tcp_queue          *queue;
  67         struct nvmet_req                req;
  68
  69         struct nvme_tcp_cmd_pdu         *cmd_pdu;
  70         struct nvme_tcp_rsp_pdu         *rsp_pdu;
  71         struct nvme_tcp_data_pdu        *data_pdu;
  72         struct nvme_tcp_r2t_pdu         *r2t_pdu;
  73
  74         u32                             rbytes_done;
  75         u32                             wbytes_done;
  76
  77         u32                             pdu_len;
  78         u32                             pdu_recv;
  79         int                             sg_idx;
  80         int                             nr_mapped;
  81         struct msghdr                   recv_msg;
  82         struct kvec                     *iov;
  83         u32                             flags;
  84
  85         struct list_head                entry;
  86         struct llist_node               lentry;
  87
  88         /* send state */
  89         u32                             offset;
  90         struct scatterlist              *cur_sg;
  91         enum nvmet_tcp_send_state       state;
  92
  93         __le32                          exp_ddgst;
  94         __le32                          recv_ddgst;
  95 };
  96
  97 enum nvmet_tcp_queue_state {
  98         NVMET_TCP_Q_CONNECTING,
  99         NVMET_TCP_Q_LIVE,
 100         NVMET_TCP_Q_DISCONNECTING,
 101 };
 102
 103 struct nvmet_tcp_queue {
 104         struct socket           *sock;
 105         struct nvmet_tcp_port   *port;
 106         struct work_struct      io_work;
 107         struct nvmet_cq         nvme_cq;
 108         struct nvmet_sq         nvme_sq;
 109
 110         /* send state */
 111         struct nvmet_tcp_cmd    *cmds;
 112         unsigned int            nr_cmds;
 113         struct list_head        free_list;
 114         struct llist_head       resp_list;
 115         struct list_head        resp_send_list;
 116         int                     send_list_len;
 117         struct nvmet_tcp_cmd    *snd_cmd;
 118
 119         /* recv state */
 120         int                     offset;
 121         int                     left;
 122         enum nvmet_tcp_recv_state rcv_state;
 123         struct nvmet_tcp_cmd    *cmd;
 124         union nvme_tcp_pdu      pdu;
 125
 126         /* digest state */
 127         bool                    hdr_digest;
 128         bool                    data_digest;
 129         struct ahash_request    *snd_hash;
 130         struct ahash_request    *rcv_hash;
 131
 132         unsigned long           poll_end;
 133
 134         spinlock_t              state_lock;
 135         enum nvmet_tcp_queue_state state;
 136
 137         struct sockaddr_storage sockaddr;
 138         struct sockaddr_storage sockaddr_peer;
 139         struct work_struct      release_work;
 140
 141         int                     idx;
 142         struct list_head        queue_list;
 143
 144         struct nvmet_tcp_cmd    connect;
 145
 146         struct page_frag_cache  pf_cache;
 147
 148         void (*data_ready)(struct sock *);
 149         void (*state_change)(struct sock *);
 150         void (*write_space)(struct sock *);
 151 };
 152
 153 struct nvmet_tcp_port {
 154         struct socket           *sock;
 155         struct work_struct      accept_work;
 156         struct nvmet_port       *nport;
 157         struct sockaddr_storage addr;
 158         void (*data_ready)(struct sock *);
 159 };
 160
 161 static DEFINE_IDA(nvmet_tcp_queue_ida);
 162 static LIST_HEAD(nvmet_tcp_queue_list);
 163 static DEFINE_MUTEX(nvmet_tcp_queue_mutex);
 164
 165 static struct workqueue_struct *nvmet_tcp_wq;
 166 static const struct nvmet_fabrics_ops nvmet_tcp_ops;
 167 static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c);
 168 static void nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd *cmd);
 169 static void nvmet_tcp_free_cmd_buffers(struct nvmet_tcp_cmd *cmd);
 170 static void nvmet_tcp_unmap_pdu_iovec(struct nvmet_tcp_cmd *cmd);
 171
 172 static inline u16 nvmet_tcp_cmd_tag(struct nvmet_tcp_queue *queue,
 173                 struct nvmet_tcp_cmd *cmd)
 174 {
 175         if (unlikely(!queue->nr_cmds)) {
 176                 /* We didn't allocate cmds yet, send 0xffff */
 177                 return USHRT_MAX;
 178         }
 179
 180         return cmd - queue->cmds;
 181 }
 182
 183 static inline bool nvmet_tcp_has_data_in(struct nvmet_tcp_cmd *cmd)
 184 {
 185         return nvme_is_write(cmd->req.cmd) &&
 186                 cmd->rbytes_done < cmd->req.transfer_len;
 187 }
 188
 189 static inline bool nvmet_tcp_need_data_in(struct nvmet_tcp_cmd *cmd)
 190 {
 191         return nvmet_tcp_has_data_in(cmd) && !cmd->req.cqe->status;
 192 }
 193
 194 static inline bool nvmet_tcp_need_data_out(struct nvmet_tcp_cmd *cmd)
 195 {
 196         return !nvme_is_write(cmd->req.cmd) &&
 197                 cmd->req.transfer_len > 0 &&
 198                 !cmd->req.cqe->status;
 199 }
 200
 201 static inline bool nvmet_tcp_has_inline_data(struct nvmet_tcp_cmd *cmd)
 202 {
 203         return nvme_is_write(cmd->req.cmd) && cmd->pdu_len &&
 204                 !cmd->rbytes_done;
 205 }
 206
 207 static inline struct nvmet_tcp_cmd *
 208 nvmet_tcp_get_cmd(struct nvmet_tcp_queue *queue)
 209 {
 210         struct nvmet_tcp_cmd *cmd;
 211
 212         cmd = list_first_entry_or_null(&queue->free_list,
 213                                 struct nvmet_tcp_cmd, entry);
 214         if (!cmd)
 215                 return NULL;
 216         list_del_init(&cmd->entry);
 217
 218         cmd->rbytes_done = cmd->wbytes_done = 0;
 219         cmd->pdu_len = 0;
 220         cmd->pdu_recv = 0;
 221         cmd->iov = NULL;
 222         cmd->flags = 0;
 223         return cmd;
 224 }
 225
 226 static inline void nvmet_tcp_put_cmd(struct nvmet_tcp_cmd *cmd)
 227 {
 228         if (unlikely(cmd == &cmd->queue->connect))
 229                 return;
 230
 231         list_add_tail(&cmd->entry, &cmd->queue->free_list);
 232 }
 233
 234 static inline int queue_cpu(struct nvmet_tcp_queue *queue)
 235 {
 236         return queue->sock->sk->sk_incoming_cpu;
 237 }
 238
 239 static inline u8 nvmet_tcp_hdgst_len(struct nvmet_tcp_queue *queue)
 240 {
 241         return queue->hdr_digest ? NVME_TCP_DIGEST_LENGTH : 0;
 242 }
 243
 244 static inline u8 nvmet_tcp_ddgst_len(struct nvmet_tcp_queue *queue)
 245 {
 246         return queue->data_digest ? NVME_TCP_DIGEST_LENGTH : 0;
 247 }
 248
 249 static inline void nvmet_tcp_hdgst(struct ahash_request *hash,
 250                 void *pdu, size_t len)
 251 {
 252         struct scatterlist sg;
 253
 254         sg_init_one(&sg, pdu, len);
 255         ahash_request_set_crypt(hash, &sg, pdu + len, len);
 256         crypto_ahash_digest(hash);
 257 }
 258
 259 static int nvmet_tcp_verify_hdgst(struct nvmet_tcp_queue *queue,
 260         void *pdu, size_t len)
 261 {
 262         struct nvme_tcp_hdr *hdr = pdu;
 263         __le32 recv_digest;
 264         __le32 exp_digest;
 265
 266         if (unlikely(!(hdr->flags & NVME_TCP_F_HDGST))) {
 267                 pr_err("queue %d: header digest enabled but no header digest\n",
 268                         queue->idx);
 269                 return -EPROTO;
 270         }
 271
 272         recv_digest = *(__le32 *)(pdu + hdr->hlen);
 273         nvmet_tcp_hdgst(queue->rcv_hash, pdu, len);
 274         exp_digest = *(__le32 *)(pdu + hdr->hlen);
 275         if (recv_digest != exp_digest) {
 276                 pr_err("queue %d: header digest error: recv %#x expected %#x\n",
 277                         queue->idx, le32_to_cpu(recv_digest),
 278                         le32_to_cpu(exp_digest));
 279                 return -EPROTO;
 280         }
 281
 282         return 0;
 283 }
 284
 285 static int nvmet_tcp_check_ddgst(struct nvmet_tcp_queue *queue, void *pdu)
 286 {
 287         struct nvme_tcp_hdr *hdr = pdu;
 288         u8 digest_len = nvmet_tcp_hdgst_len(queue);
 289         u32 len;
 290
 291         len = le32_to_cpu(hdr->plen) - hdr->hlen -
 292                 (hdr->flags & NVME_TCP_F_HDGST ? digest_len : 0);
 293
 294         if (unlikely(len && !(hdr->flags & NVME_TCP_F_DDGST))) {
 295                 pr_err("queue %d: data digest flag is cleared\n", queue->idx);
 296                 return -EPROTO;
 297         }
 298
 299         return 0;
 300 }
 301
 302 static void nvmet_tcp_free_cmd_buffers(struct nvmet_tcp_cmd *cmd)
 303 {
 304         WARN_ON(unlikely(cmd->nr_mapped > 0));
 305
 306         kfree(cmd->iov);
 307         sgl_free(cmd->req.sg);
 308         cmd->iov = NULL;
 309         cmd->req.sg = NULL;
 310 }
 311
 312 static void nvmet_tcp_unmap_pdu_iovec(struct nvmet_tcp_cmd *cmd)
 313 {
 314         struct scatterlist *sg;
 315         int i;
 316
 317         sg = &cmd->req.sg[cmd->sg_idx];
 318
 319         for (i = 0; i < cmd->nr_mapped; i++)
 320                 kunmap(sg_page(&sg[i]));
 321
 322         cmd->nr_mapped = 0;
 323 }
 324
 325 static void nvmet_tcp_map_pdu_iovec(struct nvmet_tcp_cmd *cmd)
 326 {
 327         struct kvec *iov = cmd->iov;
 328         struct scatterlist *sg;
 329         u32 length, offset, sg_offset;
 330
 331         length = cmd->pdu_len;
 332         cmd->nr_mapped = DIV_ROUND_UP(length, PAGE_SIZE);
 333         offset = cmd->rbytes_done;
 334         cmd->sg_idx = offset / PAGE_SIZE;
 335         sg_offset = offset % PAGE_SIZE;
 336         sg = &cmd->req.sg[cmd->sg_idx];
 337
 338         while (length) {
 339                 u32 iov_len = min_t(u32, length, sg->length - sg_offset);
 340
 341                 iov->iov_base = kmap(sg_page(sg)) + sg->offset + sg_offset;
 342                 iov->iov_len = iov_len;
 343
 344                 length -= iov_len;
 345                 sg = sg_next(sg);
 346                 iov++;
 347                 sg_offset = 0;
 348         }
 349
 350         iov_iter_kvec(&cmd->recv_msg.msg_iter, READ, cmd->iov,
 351                 cmd->nr_mapped, cmd->pdu_len);
 352 }
 353
 354 static void nvmet_tcp_fatal_error(struct nvmet_tcp_queue *queue)
 355 {
 356         queue->rcv_state = NVMET_TCP_RECV_ERR;
 357         if (queue->nvme_sq.ctrl)
 358                 nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl);
 359         else
 360                 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
 361 }
 362
 363 static void nvmet_tcp_socket_error(struct nvmet_tcp_queue *queue, int status)
 364 {
 365         if (status == -EPIPE || status == -ECONNRESET)
 366                 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
 367         else
 368                 nvmet_tcp_fatal_error(queue);
 369 }
 370
 371 static int nvmet_tcp_map_data(struct nvmet_tcp_cmd *cmd)
 372 {
 373         struct nvme_sgl_desc *sgl = &cmd->req.cmd->common.dptr.sgl;
 374         u32 len = le32_to_cpu(sgl->length);
 375
 376         if (!len)
 377                 return 0;
 378
 379         if (sgl->type == ((NVME_SGL_FMT_DATA_DESC << 4) |
 380                           NVME_SGL_FMT_OFFSET)) {
 381                 if (!nvme_is_write(cmd->req.cmd))
 382                         return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
 383
 384                 if (len > cmd->req.port->inline_data_size)
 385                         return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR;
 386                 cmd->pdu_len = len;
 387         }
 388         cmd->req.transfer_len += len;
 389
 390         cmd->req.sg = sgl_alloc(len, GFP_KERNEL, &cmd->req.sg_cnt);
 391         if (!cmd->req.sg)
 392                 return NVME_SC_INTERNAL;
 393         cmd->cur_sg = cmd->req.sg;
 394
 395         if (nvmet_tcp_has_data_in(cmd)) {
 396                 cmd->iov = kmalloc_array(cmd->req.sg_cnt,
 397                                 sizeof(*cmd->iov), GFP_KERNEL);
 398                 if (!cmd->iov)
 399                         goto err;
 400         }
 401
 402         return 0;
 403 err:
 404         nvmet_tcp_free_cmd_buffers(cmd);
 405         return NVME_SC_INTERNAL;
 406 }
 407
 408 static void nvmet_tcp_calc_ddgst(struct ahash_request *hash,
 409                 struct nvmet_tcp_cmd *cmd)
 410 {
 411         ahash_request_set_crypt(hash, cmd->req.sg,
 412                 (void *)&cmd->exp_ddgst, cmd->req.transfer_len);
 413         crypto_ahash_digest(hash);
 414 }
 415
 416 static void nvmet_setup_c2h_data_pdu(struct nvmet_tcp_cmd *cmd)
 417 {
 418         struct nvme_tcp_data_pdu *pdu = cmd->data_pdu;
 419         struct nvmet_tcp_queue *queue = cmd->queue;
 420         u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
 421         u8 ddgst = nvmet_tcp_ddgst_len(cmd->queue);
 422
 423         cmd->offset = 0;
 424         cmd->state = NVMET_TCP_SEND_DATA_PDU;
 425
 426         pdu->hdr.type = nvme_tcp_c2h_data;
 427         pdu->hdr.flags = NVME_TCP_F_DATA_LAST | (queue->nvme_sq.sqhd_disabled ?
 428                                                 NVME_TCP_F_DATA_SUCCESS : 0);
 429         pdu->hdr.hlen = sizeof(*pdu);
 430         pdu->hdr.pdo = pdu->hdr.hlen + hdgst;
 431         pdu->hdr.plen =
 432                 cpu_to_le32(pdu->hdr.hlen + hdgst +
 433                                 cmd->req.transfer_len + ddgst);
 434         pdu->command_id = cmd->req.cqe->command_id;
 435         pdu->data_length = cpu_to_le32(cmd->req.transfer_len);
 436         pdu->data_offset = cpu_to_le32(cmd->wbytes_done);
 437
 438         if (queue->data_digest) {
 439                 pdu->hdr.flags |= NVME_TCP_F_DDGST;
 440                 nvmet_tcp_calc_ddgst(queue->snd_hash, cmd);
 441         }
 442
 443         if (cmd->queue->hdr_digest) {
 444                 pdu->hdr.flags |= NVME_TCP_F_HDGST;
 445                 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
 446         }
 447 }
 448
 449 static void nvmet_setup_r2t_pdu(struct nvmet_tcp_cmd *cmd)
 450 {
 451         struct nvme_tcp_r2t_pdu *pdu = cmd->r2t_pdu;
 452         struct nvmet_tcp_queue *queue = cmd->queue;
 453         u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
 454
 455         cmd->offset = 0;
 456         cmd->state = NVMET_TCP_SEND_R2T;
 457
 458         pdu->hdr.type = nvme_tcp_r2t;
 459         pdu->hdr.flags = 0;
 460         pdu->hdr.hlen = sizeof(*pdu);
 461         pdu->hdr.pdo = 0;
 462         pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst);
 463
 464         pdu->command_id = cmd->req.cmd->common.command_id;
 465         pdu->ttag = nvmet_tcp_cmd_tag(cmd->queue, cmd);
 466         pdu->r2t_length = cpu_to_le32(cmd->req.transfer_len - cmd->rbytes_done);
 467         pdu->r2t_offset = cpu_to_le32(cmd->rbytes_done);
 468         if (cmd->queue->hdr_digest) {
 469                 pdu->hdr.flags |= NVME_TCP_F_HDGST;
 470                 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
 471         }
 472 }
 473
 474 static void nvmet_setup_response_pdu(struct nvmet_tcp_cmd *cmd)
 475 {
 476         struct nvme_tcp_rsp_pdu *pdu = cmd->rsp_pdu;
 477         struct nvmet_tcp_queue *queue = cmd->queue;
 478         u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
 479
 480         cmd->offset = 0;
 481         cmd->state = NVMET_TCP_SEND_RESPONSE;
 482
 483         pdu->hdr.type = nvme_tcp_rsp;
 484         pdu->hdr.flags = 0;
 485         pdu->hdr.hlen = sizeof(*pdu);
 486         pdu->hdr.pdo = 0;
 487         pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst);
 488         if (cmd->queue->hdr_digest) {
 489                 pdu->hdr.flags |= NVME_TCP_F_HDGST;
 490                 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
 491         }
 492 }
 493
 494 static void nvmet_tcp_process_resp_list(struct nvmet_tcp_queue *queue)
 495 {
 496         struct llist_node *node;
 497         struct nvmet_tcp_cmd *cmd;
 498
 499         for (node = llist_del_all(&queue->resp_list); node; node = node->next) {
 500                 cmd = llist_entry(node, struct nvmet_tcp_cmd, lentry);
 501                 list_add(&cmd->entry, &queue->resp_send_list);
 502                 queue->send_list_len++;
 503         }
 504 }
 505
 506 static struct nvmet_tcp_cmd *nvmet_tcp_fetch_cmd(struct nvmet_tcp_queue *queue)
 507 {
 508         queue->snd_cmd = list_first_entry_or_null(&queue->resp_send_list,
 509                                 struct nvmet_tcp_cmd, entry);
 510         if (!queue->snd_cmd) {
 511                 nvmet_tcp_process_resp_list(queue);
 512                 queue->snd_cmd =
 513                         list_first_entry_or_null(&queue->resp_send_list,
 514                                         struct nvmet_tcp_cmd, entry);
 515                 if (unlikely(!queue->snd_cmd))
 516                         return NULL;
 517         }
 518
 519         list_del_init(&queue->snd_cmd->entry);
 520         queue->send_list_len--;
 521
 522         if (nvmet_tcp_need_data_out(queue->snd_cmd))
 523                 nvmet_setup_c2h_data_pdu(queue->snd_cmd);
 524         else if (nvmet_tcp_need_data_in(queue->snd_cmd))
 525                 nvmet_setup_r2t_pdu(queue->snd_cmd);
 526         else
 527                 nvmet_setup_response_pdu(queue->snd_cmd);
 528
 529         return queue->snd_cmd;
 530 }
 531
 532 static void nvmet_tcp_queue_response(struct nvmet_req *req)
 533 {
 534         struct nvmet_tcp_cmd *cmd =
 535                 container_of(req, struct nvmet_tcp_cmd, req);
 536         struct nvmet_tcp_queue  *queue = cmd->queue;
 537         struct nvme_sgl_desc *sgl;
 538         u32 len;
 539
 540         if (unlikely(cmd == queue->cmd)) {
 541                 sgl = &cmd->req.cmd->common.dptr.sgl;
 542                 len = le32_to_cpu(sgl->length);
 543
 544                 /*
 545                  * Wait for inline data before processing the response.
 546                  * Avoid using helpers, this might happen before
 547                  * nvmet_req_init is completed.
 548                  */
 549                 if (queue->rcv_state == NVMET_TCP_RECV_PDU &&
 550                     len && len <= cmd->req.port->inline_data_size &&
 551                     nvme_is_write(cmd->req.cmd))
 552                         return;
 553         }
 554
 555         llist_add(&cmd->lentry, &queue->resp_list);
 556         queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &cmd->queue->io_work);
 557 }
 558
 559 static void nvmet_tcp_execute_request(struct nvmet_tcp_cmd *cmd)
 560 {
 561         if (unlikely(cmd->flags & NVMET_TCP_F_INIT_FAILED))
 562                 nvmet_tcp_queue_response(&cmd->req);
 563         else
 564                 cmd->req.execute(&cmd->req);
 565 }
 566
 567 static int nvmet_try_send_data_pdu(struct nvmet_tcp_cmd *cmd)
 568 {
 569         u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
 570         int left = sizeof(*cmd->data_pdu) - cmd->offset + hdgst;
 571         int ret;
 572
 573         ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->data_pdu),
 574                         offset_in_page(cmd->data_pdu) + cmd->offset,
 575                         left, MSG_DONTWAIT | MSG_MORE | MSG_SENDPAGE_NOTLAST);
 576         if (ret <= 0)
 577                 return ret;
 578
 579         cmd->offset += ret;
 580         left -= ret;
 581
 582         if (left)
 583                 return -EAGAIN;
 584
 585         cmd->state = NVMET_TCP_SEND_DATA;
 586         cmd->offset  = 0;
 587         return 1;
 588 }
 589
 590 static int nvmet_try_send_data(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
 591 {
 592         struct nvmet_tcp_queue *queue = cmd->queue;
 593         int ret;
 594
 595         while (cmd->cur_sg) {
 596                 struct page *page = sg_page(cmd->cur_sg);
 597                 u32 left = cmd->cur_sg->length - cmd->offset;
 598                 int flags = MSG_DONTWAIT;
 599
 600                 if ((!last_in_batch && cmd->queue->send_list_len) ||
 601                     cmd->wbytes_done + left < cmd->req.transfer_len ||
 602                     queue->data_digest || !queue->nvme_sq.sqhd_disabled)
 603                         flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
 604
 605                 ret = kernel_sendpage(cmd->queue->sock, page, cmd->offset,
 606                                         left, flags);
 607                 if (ret <= 0)
 608                         return ret;
 609
 610                 cmd->offset += ret;
 611                 cmd->wbytes_done += ret;
 612
 613                 /* Done with sg?*/
 614                 if (cmd->offset == cmd->cur_sg->length) {
 615                         cmd->cur_sg = sg_next(cmd->cur_sg);
 616                         cmd->offset = 0;
 617                 }
 618         }
 619
 620         if (queue->data_digest) {
 621                 cmd->state = NVMET_TCP_SEND_DDGST;
 622                 cmd->offset = 0;
 623         } else {
 624                 if (queue->nvme_sq.sqhd_disabled) {
 625                         cmd->queue->snd_cmd = NULL;
 626                         nvmet_tcp_put_cmd(cmd);
 627                 } else {
 628                         nvmet_setup_response_pdu(cmd);
 629                 }
 630         }
 631
 632         if (queue->nvme_sq.sqhd_disabled)
 633                 nvmet_tcp_free_cmd_buffers(cmd);
 634
 635         return 1;
 636
 637 }
 638
 639 static int nvmet_try_send_response(struct nvmet_tcp_cmd *cmd,
 640                 bool last_in_batch)
 641 {
 642         u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
 643         int left = sizeof(*cmd->rsp_pdu) - cmd->offset + hdgst;
 644         int flags = MSG_DONTWAIT;
 645         int ret;
 646
 647         if (!last_in_batch && cmd->queue->send_list_len)
 648                 flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
 649         else
 650                 flags |= MSG_EOR;
 651
 652         ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->rsp_pdu),
 653                 offset_in_page(cmd->rsp_pdu) + cmd->offset, left, flags);
 654         if (ret <= 0)
 655                 return ret;
 656         cmd->offset += ret;
 657         left -= ret;
 658
 659         if (left)
 660                 return -EAGAIN;
 661
 662         nvmet_tcp_free_cmd_buffers(cmd);
 663         cmd->queue->snd_cmd = NULL;
 664         nvmet_tcp_put_cmd(cmd);
 665         return 1;
 666 }
 667
 668 static int nvmet_try_send_r2t(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
 669 {
 670         u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
 671         int left = sizeof(*cmd->r2t_pdu) - cmd->offset + hdgst;
 672         int flags = MSG_DONTWAIT;
 673         int ret;
 674
 675         if (!last_in_batch && cmd->queue->send_list_len)
 676                 flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
 677         else
 678                 flags |= MSG_EOR;
 679
 680         ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->r2t_pdu),
 681                 offset_in_page(cmd->r2t_pdu) + cmd->offset, left, flags);
 682         if (ret <= 0)
 683                 return ret;
 684         cmd->offset += ret;
 685         left -= ret;
 686
 687         if (left)
 688                 return -EAGAIN;
 689
 690         cmd->queue->snd_cmd = NULL;
 691         return 1;
 692 }
 693
 694 static int nvmet_try_send_ddgst(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
 695 {
 696         struct nvmet_tcp_queue *queue = cmd->queue;
 697         int left = NVME_TCP_DIGEST_LENGTH - cmd->offset;
 698         struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
 699         struct kvec iov = {
 700                 .iov_base = (u8 *)&cmd->exp_ddgst + cmd->offset,
 701                 .iov_len = left
 702         };
 703         int ret;
 704
 705         if (!last_in_batch && cmd->queue->send_list_len)
 706                 msg.msg_flags |= MSG_MORE;
 707         else
 708                 msg.msg_flags |= MSG_EOR;
 709
 710         ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len);
 711         if (unlikely(ret <= 0))
 712                 return ret;
 713
 714         cmd->offset += ret;
 715         left -= ret;
 716
 717         if (left)
 718                 return -EAGAIN;
 719
 720         if (queue->nvme_sq.sqhd_disabled) {
 721                 cmd->queue->snd_cmd = NULL;
 722                 nvmet_tcp_put_cmd(cmd);
 723         } else {
 724                 nvmet_setup_response_pdu(cmd);
 725         }
 726         return 1;
 727 }
 728
 729 static int nvmet_tcp_try_send_one(struct nvmet_tcp_queue *queue,
 730                 bool last_in_batch)
 731 {
 732         struct nvmet_tcp_cmd *cmd = queue->snd_cmd;
 733         int ret = 0;
 734
 735         if (!cmd || queue->state == NVMET_TCP_Q_DISCONNECTING) {
 736                 cmd = nvmet_tcp_fetch_cmd(queue);
 737                 if (unlikely(!cmd))
 738                         return 0;
 739         }
 740
 741         if (cmd->state == NVMET_TCP_SEND_DATA_PDU) {
 742                 ret = nvmet_try_send_data_pdu(cmd);
 743                 if (ret <= 0)
 744                         goto done_send;
 745         }
 746
 747         if (cmd->state == NVMET_TCP_SEND_DATA) {
 748                 ret = nvmet_try_send_data(cmd, last_in_batch);
 749                 if (ret <= 0)
 750                         goto done_send;
 751         }
 752
 753         if (cmd->state == NVMET_TCP_SEND_DDGST) {
 754                 ret = nvmet_try_send_ddgst(cmd, last_in_batch);
 755                 if (ret <= 0)
 756                         goto done_send;
 757         }
 758
 759         if (cmd->state == NVMET_TCP_SEND_R2T) {
 760                 ret = nvmet_try_send_r2t(cmd, last_in_batch);
 761                 if (ret <= 0)
 762                         goto done_send;
 763         }
 764
 765         if (cmd->state == NVMET_TCP_SEND_RESPONSE)
 766                 ret = nvmet_try_send_response(cmd, last_in_batch);
 767
 768 done_send:
 769         if (ret < 0) {
 770                 if (ret == -EAGAIN)
 771                         return 0;
 772                 return ret;
 773         }
 774
 775         return 1;
 776 }
 777
 778 static int nvmet_tcp_try_send(struct nvmet_tcp_queue *queue,
 779                 int budget, int *sends)
 780 {
 781         int i, ret = 0;
 782
 783         for (i = 0; i < budget; i++) {
 784                 ret = nvmet_tcp_try_send_one(queue, i == budget - 1);
 785                 if (unlikely(ret < 0)) {
 786                         nvmet_tcp_socket_error(queue, ret);
 787                         goto done;
 788                 } else if (ret == 0) {
 789                         break;
 790                 }
 791                 (*sends)++;
 792         }
 793 done:
 794         return ret;
 795 }
 796
 797 static void nvmet_prepare_receive_pdu(struct nvmet_tcp_queue *queue)
 798 {
 799         queue->offset = 0;
 800         queue->left = sizeof(struct nvme_tcp_hdr);
 801         queue->cmd = NULL;
 802         queue->rcv_state = NVMET_TCP_RECV_PDU;
 803 }
 804
 805 static void nvmet_tcp_free_crypto(struct nvmet_tcp_queue *queue)
 806 {
 807         struct crypto_ahash *tfm = crypto_ahash_reqtfm(queue->rcv_hash);
 808
 809         ahash_request_free(queue->rcv_hash);
 810         ahash_request_free(queue->snd_hash);
 811         crypto_free_ahash(tfm);
 812 }
 813
 814 static int nvmet_tcp_alloc_crypto(struct nvmet_tcp_queue *queue)
 815 {
 816         struct crypto_ahash *tfm;
 817
 818         tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
 819         if (IS_ERR(tfm))
 820                 return PTR_ERR(tfm);
 821
 822         queue->snd_hash = ahash_request_alloc(tfm, GFP_KERNEL);
 823         if (!queue->snd_hash)
 824                 goto free_tfm;
 825         ahash_request_set_callback(queue->snd_hash, 0, NULL, NULL);
 826
 827         queue->rcv_hash = ahash_request_alloc(tfm, GFP_KERNEL);
 828         if (!queue->rcv_hash)
 829                 goto free_snd_hash;
 830         ahash_request_set_callback(queue->rcv_hash, 0, NULL, NULL);
 831
 832         return 0;
 833 free_snd_hash:
 834         ahash_request_free(queue->snd_hash);
 835 free_tfm:
 836         crypto_free_ahash(tfm);
 837         return -ENOMEM;
 838 }
 839
 840
 841 static int nvmet_tcp_handle_icreq(struct nvmet_tcp_queue *queue)
 842 {
 843         struct nvme_tcp_icreq_pdu *icreq = &queue->pdu.icreq;
 844         struct nvme_tcp_icresp_pdu *icresp = &queue->pdu.icresp;
 845         struct msghdr msg = {};
 846         struct kvec iov;
 847         int ret;
 848
 849         if (le32_to_cpu(icreq->hdr.plen) != sizeof(struct nvme_tcp_icreq_pdu)) {
 850                 pr_err("bad nvme-tcp pdu length (%d)\n",
 851                         le32_to_cpu(icreq->hdr.plen));
 852                 nvmet_tcp_fatal_error(queue);
 853         }
 854
 855         if (icreq->pfv != NVME_TCP_PFV_1_0) {
 856                 pr_err("queue %d: bad pfv %d\n", queue->idx, icreq->pfv);
 857                 return -EPROTO;
 858         }
 859
 860         if (icreq->hpda != 0) {
 861                 pr_err("queue %d: unsupported hpda %d\n", queue->idx,
 862                         icreq->hpda);
 863                 return -EPROTO;
 864         }
 865
 866         queue->hdr_digest = !!(icreq->digest & NVME_TCP_HDR_DIGEST_ENABLE);
 867         queue->data_digest = !!(icreq->digest & NVME_TCP_DATA_DIGEST_ENABLE);
 868         if (queue->hdr_digest || queue->data_digest) {
 869                 ret = nvmet_tcp_alloc_crypto(queue);
 870                 if (ret)
 871                         return ret;
 872         }
 873
 874         memset(icresp, 0, sizeof(*icresp));
 875         icresp->hdr.type = nvme_tcp_icresp;
 876         icresp->hdr.hlen = sizeof(*icresp);
 877         icresp->hdr.pdo = 0;
 878         icresp->hdr.plen = cpu_to_le32(icresp->hdr.hlen);
 879         icresp->pfv = cpu_to_le16(NVME_TCP_PFV_1_0);
 880         icresp->maxdata = cpu_to_le32(0x400000); /* 16M arbitrary limit */
 881         icresp->cpda = 0;
 882         if (queue->hdr_digest)
 883                 icresp->digest |= NVME_TCP_HDR_DIGEST_ENABLE;
 884         if (queue->data_digest)
 885                 icresp->digest |= NVME_TCP_DATA_DIGEST_ENABLE;
 886
 887         iov.iov_base = icresp;
 888         iov.iov_len = sizeof(*icresp);
 889         ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len);
 890         if (ret < 0)
 891                 goto free_crypto;
 892
 893         queue->state = NVMET_TCP_Q_LIVE;
 894         nvmet_prepare_receive_pdu(queue);
 895         return 0;
 896 free_crypto:
 897         if (queue->hdr_digest || queue->data_digest)
 898                 nvmet_tcp_free_crypto(queue);
 899         return ret;
 900 }
 901
 902 static void nvmet_tcp_handle_req_failure(struct nvmet_tcp_queue *queue,
 903                 struct nvmet_tcp_cmd *cmd, struct nvmet_req *req)
 904 {
 905         size_t data_len = le32_to_cpu(req->cmd->common.dptr.sgl.length);
 906         int ret;
 907
 908         /*
 909          * This command has not been processed yet, hence we are trying to
 910          * figure out if there is still pending data left to receive. If
 911          * we don't, we can simply prepare for the next pdu and bail out,
 912          * otherwise we will need to prepare a buffer and receive the
 913          * stale data before continuing forward.
 914          */
 915         if (!nvme_is_write(cmd->req.cmd) || !data_len ||
 916             data_len > cmd->req.port->inline_data_size) {
 917                 nvmet_prepare_receive_pdu(queue);
 918                 return;
 919         }
 920
 921         ret = nvmet_tcp_map_data(cmd);
 922         if (unlikely(ret)) {
 923                 pr_err("queue %d: failed to map data\n", queue->idx);
 924                 nvmet_tcp_fatal_error(queue);
 925                 return;
 926         }
 927
 928         queue->rcv_state = NVMET_TCP_RECV_DATA;
 929         nvmet_tcp_map_pdu_iovec(cmd);
 930         cmd->flags |= NVMET_TCP_F_INIT_FAILED;
 931 }
 932
 933 static int nvmet_tcp_handle_h2c_data_pdu(struct nvmet_tcp_queue *queue)
 934 {
 935         struct nvme_tcp_data_pdu *data = &queue->pdu.data;
 936         struct nvmet_tcp_cmd *cmd;
 937
 938         if (likely(queue->nr_cmds))
 939                 cmd = &queue->cmds[data->ttag];
 940         else
 941                 cmd = &queue->connect;
 942
 943         if (le32_to_cpu(data->data_offset) != cmd->rbytes_done) {
 944                 pr_err("ttag %u unexpected data offset %u (expected %u)\n",
 945                         data->ttag, le32_to_cpu(data->data_offset),
 946                         cmd->rbytes_done);
 947                 /* FIXME: use path and transport errors */
 948                 nvmet_req_complete(&cmd->req,
 949                         NVME_SC_INVALID_FIELD | NVME_SC_DNR);
 950                 return -EPROTO;
 951         }
 952
 953         cmd->pdu_len = le32_to_cpu(data->data_length);
 954         cmd->pdu_recv = 0;
 955         nvmet_tcp_map_pdu_iovec(cmd);
 956         queue->cmd = cmd;
 957         queue->rcv_state = NVMET_TCP_RECV_DATA;
 958
 959         return 0;
 960 }
 961
 962 static int nvmet_tcp_done_recv_pdu(struct nvmet_tcp_queue *queue)
 963 {
 964         struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr;
 965         struct nvme_command *nvme_cmd = &queue->pdu.cmd.cmd;
 966         struct nvmet_req *req;
 967         int ret;
 968
 969         if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) {
 970                 if (hdr->type != nvme_tcp_icreq) {
 971                         pr_err("unexpected pdu type (%d) before icreq\n",
 972                                 hdr->type);
 973                         nvmet_tcp_fatal_error(queue);
 974                         return -EPROTO;
 975                 }
 976                 return nvmet_tcp_handle_icreq(queue);
 977         }
 978
 979         if (hdr->type == nvme_tcp_h2c_data) {
 980                 ret = nvmet_tcp_handle_h2c_data_pdu(queue);
 981                 if (unlikely(ret))
 982                         return ret;
 983                 return 0;
 984         }
 985
 986         queue->cmd = nvmet_tcp_get_cmd(queue);
 987         if (unlikely(!queue->cmd)) {
 988                 /* This should never happen */
 989                 pr_err("queue %d: out of commands (%d) send_list_len: %d, opcode: %d",
 990                         queue->idx, queue->nr_cmds, queue->send_list_len,
 991                         nvme_cmd->common.opcode);
 992                 nvmet_tcp_fatal_error(queue);
 993                 return -ENOMEM;
 994         }
 995
 996         req = &queue->cmd->req;
 997         memcpy(req->cmd, nvme_cmd, sizeof(*nvme_cmd));
 998
 999         if (unlikely(!nvmet_req_init(req, &queue->nvme_cq,
1000                         &queue->nvme_sq, &nvmet_tcp_ops))) {
1001                 pr_err("failed cmd %p id %d opcode %d, data_len: %d\n",
1002                         req->cmd, req->cmd->common.command_id,
1003                         req->cmd->common.opcode,
1004                         le32_to_cpu(req->cmd->common.dptr.sgl.length));
1005
1006                 nvmet_tcp_handle_req_failure(queue, queue->cmd, req);
1007                 return 0;
1008         }
1009
1010         ret = nvmet_tcp_map_data(queue->cmd);
1011         if (unlikely(ret)) {
1012                 pr_err("queue %d: failed to map data\n", queue->idx);
1013                 if (nvmet_tcp_has_inline_data(queue->cmd))
1014                         nvmet_tcp_fatal_error(queue);
1015                 else
1016                         nvmet_req_complete(req, ret);
1017                 ret = -EAGAIN;
1018                 goto out;
1019         }
1020
1021         if (nvmet_tcp_need_data_in(queue->cmd)) {
1022                 if (nvmet_tcp_has_inline_data(queue->cmd)) {
1023                         queue->rcv_state = NVMET_TCP_RECV_DATA;
1024                         nvmet_tcp_map_pdu_iovec(queue->cmd);
1025                         return 0;
1026                 }
1027                 /* send back R2T */
1028                 nvmet_tcp_queue_response(&queue->cmd->req);
1029                 goto out;
1030         }
1031
1032         queue->cmd->req.execute(&queue->cmd->req);
1033 out:
1034         nvmet_prepare_receive_pdu(queue);
1035         return ret;
1036 }
1037
1038 static const u8 nvme_tcp_pdu_sizes[] = {
1039         [nvme_tcp_icreq]        = sizeof(struct nvme_tcp_icreq_pdu),
1040         [nvme_tcp_cmd]          = sizeof(struct nvme_tcp_cmd_pdu),
1041         [nvme_tcp_h2c_data]     = sizeof(struct nvme_tcp_data_pdu),
1042 };
1043
1044 static inline u8 nvmet_tcp_pdu_size(u8 type)
1045 {
1046         size_t idx = type;
1047
1048         return (idx < ARRAY_SIZE(nvme_tcp_pdu_sizes) &&
1049                 nvme_tcp_pdu_sizes[idx]) ?
1050                         nvme_tcp_pdu_sizes[idx] : 0;
1051 }
1052
1053 static inline bool nvmet_tcp_pdu_valid(u8 type)
1054 {
1055         switch (type) {
1056         case nvme_tcp_icreq:
1057         case nvme_tcp_cmd:
1058         case nvme_tcp_h2c_data:
1059                 /* fallthru */
1060                 return true;
1061         }
1062
1063         return false;
1064 }
1065
1066 static int nvmet_tcp_try_recv_pdu(struct nvmet_tcp_queue *queue)
1067 {
1068         struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr;
1069         int len;
1070         struct kvec iov;
1071         struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
1072
1073 recv:
1074         iov.iov_base = (void *)&queue->pdu + queue->offset;
1075         iov.iov_len = queue->left;
1076         len = kernel_recvmsg(queue->sock, &msg, &iov, 1,
1077                         iov.iov_len, msg.msg_flags);
1078         if (unlikely(len < 0))
1079                 return len;
1080
1081         queue->offset += len;
1082         queue->left -= len;
1083         if (queue->left)
1084                 return -EAGAIN;
1085
1086         if (queue->offset == sizeof(struct nvme_tcp_hdr)) {
1087                 u8 hdgst = nvmet_tcp_hdgst_len(queue);
1088
1089                 if (unlikely(!nvmet_tcp_pdu_valid(hdr->type))) {
1090                         pr_err("unexpected pdu type %d\n", hdr->type);
1091                         nvmet_tcp_fatal_error(queue);
1092                         return -EIO;
1093                 }
1094
1095                 if (unlikely(hdr->hlen != nvmet_tcp_pdu_size(hdr->type))) {
1096                         pr_err("pdu %d bad hlen %d\n", hdr->type, hdr->hlen);
1097                         return -EIO;
1098                 }
1099
1100                 queue->left = hdr->hlen - queue->offset + hdgst;
1101                 goto recv;
1102         }
1103
1104         if (queue->hdr_digest &&
1105             nvmet_tcp_verify_hdgst(queue, &queue->pdu, hdr->hlen)) {
1106                 nvmet_tcp_fatal_error(queue); /* fatal */
1107                 return -EPROTO;
1108         }
1109
1110         if (queue->data_digest &&
1111             nvmet_tcp_check_ddgst(queue, &queue->pdu)) {
1112                 nvmet_tcp_fatal_error(queue); /* fatal */
1113                 return -EPROTO;
1114         }
1115
1116         return nvmet_tcp_done_recv_pdu(queue);
1117 }
1118
1119 static void nvmet_tcp_prep_recv_ddgst(struct nvmet_tcp_cmd *cmd)
1120 {
1121         struct nvmet_tcp_queue *queue = cmd->queue;
1122
1123         nvmet_tcp_calc_ddgst(queue->rcv_hash, cmd);
1124         queue->offset = 0;
1125         queue->left = NVME_TCP_DIGEST_LENGTH;
1126         queue->rcv_state = NVMET_TCP_RECV_DDGST;
1127 }
1128
1129 static int nvmet_tcp_try_recv_data(struct nvmet_tcp_queue *queue)
1130 {
1131         struct nvmet_tcp_cmd  *cmd = queue->cmd;
1132         int ret;
1133
1134         while (msg_data_left(&cmd->recv_msg)) {
1135                 ret = sock_recvmsg(cmd->queue->sock, &cmd->recv_msg,
1136                         cmd->recv_msg.msg_flags);
1137                 if (ret <= 0)
1138                         return ret;
1139
1140                 cmd->pdu_recv += ret;
1141                 cmd->rbytes_done += ret;
1142         }
1143
1144         nvmet_tcp_unmap_pdu_iovec(cmd);
1145         if (queue->data_digest) {
1146                 nvmet_tcp_prep_recv_ddgst(cmd);
1147                 return 0;
1148         }
1149
1150         if (cmd->rbytes_done == cmd->req.transfer_len)
1151                 nvmet_tcp_execute_request(cmd);
1152
1153         nvmet_prepare_receive_pdu(queue);
1154         return 0;
1155 }
1156
1157 static int nvmet_tcp_try_recv_ddgst(struct nvmet_tcp_queue *queue)
1158 {
1159         struct nvmet_tcp_cmd *cmd = queue->cmd;
1160         int ret;
1161         struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
1162         struct kvec iov = {
1163                 .iov_base = (void *)&cmd->recv_ddgst + queue->offset,
1164                 .iov_len = queue->left
1165         };
1166
1167         ret = kernel_recvmsg(queue->sock, &msg, &iov, 1,
1168                         iov.iov_len, msg.msg_flags);
1169         if (unlikely(ret < 0))
1170                 return ret;
1171
1172         queue->offset += ret;
1173         queue->left -= ret;
1174         if (queue->left)
1175                 return -EAGAIN;
1176
1177         if (queue->data_digest && cmd->exp_ddgst != cmd->recv_ddgst) {
1178                 pr_err("queue %d: cmd %d pdu (%d) data digest error: recv %#x expected %#x\n",
1179                         queue->idx, cmd->req.cmd->common.command_id,
1180                         queue->pdu.cmd.hdr.type, le32_to_cpu(cmd->recv_ddgst),
1181                         le32_to_cpu(cmd->exp_ddgst));
1182                 nvmet_tcp_finish_cmd(cmd);
1183                 nvmet_tcp_fatal_error(queue);
1184                 ret = -EPROTO;
1185                 goto out;
1186         }
1187
1188         if (cmd->rbytes_done == cmd->req.transfer_len)
1189                 nvmet_tcp_execute_request(cmd);
1190
1191         ret = 0;
1192 out:
1193         nvmet_prepare_receive_pdu(queue);
1194         return ret;
1195 }
1196
1197 static int nvmet_tcp_try_recv_one(struct nvmet_tcp_queue *queue)
1198 {
1199         int result = 0;
1200
1201         if (unlikely(queue->rcv_state == NVMET_TCP_RECV_ERR))
1202                 return 0;
1203
1204         if (queue->rcv_state == NVMET_TCP_RECV_PDU) {
1205                 result = nvmet_tcp_try_recv_pdu(queue);
1206                 if (result != 0)
1207                         goto done_recv;
1208         }
1209
1210         if (queue->rcv_state == NVMET_TCP_RECV_DATA) {
1211                 result = nvmet_tcp_try_recv_data(queue);
1212                 if (result != 0)
1213                         goto done_recv;
1214         }
1215
1216         if (queue->rcv_state == NVMET_TCP_RECV_DDGST) {
1217                 result = nvmet_tcp_try_recv_ddgst(queue);
1218                 if (result != 0)
1219                         goto done_recv;
1220         }
1221
1222 done_recv:
1223         if (result < 0) {
1224                 if (result == -EAGAIN)
1225                         return 0;
1226                 return result;
1227         }
1228         return 1;
1229 }
1230
1231 static int nvmet_tcp_try_recv(struct nvmet_tcp_queue *queue,
1232                 int budget, int *recvs)
1233 {
1234         int i, ret = 0;
1235
1236         for (i = 0; i < budget; i++) {
1237                 ret = nvmet_tcp_try_recv_one(queue);
1238                 if (unlikely(ret < 0)) {
1239                         nvmet_tcp_socket_error(queue, ret);
1240                         goto done;
1241                 } else if (ret == 0) {
1242                         break;
1243                 }
1244                 (*recvs)++;
1245         }
1246 done:
1247         return ret;
1248 }
1249
1250 static void nvmet_tcp_schedule_release_queue(struct nvmet_tcp_queue *queue)
1251 {
1252         spin_lock(&queue->state_lock);
1253         if (queue->state != NVMET_TCP_Q_DISCONNECTING) {
1254                 queue->state = NVMET_TCP_Q_DISCONNECTING;
1255                 queue_work(nvmet_wq, &queue->release_work);
1256         }
1257         spin_unlock(&queue->state_lock);
1258 }
1259
1260 static inline void nvmet_tcp_arm_queue_deadline(struct nvmet_tcp_queue *queue)
1261 {
1262         queue->poll_end = jiffies + usecs_to_jiffies(idle_poll_period_usecs);
1263 }
1264
1265 static bool nvmet_tcp_check_queue_deadline(struct nvmet_tcp_queue *queue,
1266                 int ops)
1267 {
1268         if (!idle_poll_period_usecs)
1269                 return false;
1270
1271         if (ops)
1272                 nvmet_tcp_arm_queue_deadline(queue);
1273
1274         return !time_after(jiffies, queue->poll_end);
1275 }
1276
1277 static void nvmet_tcp_io_work(struct work_struct *w)
1278 {
1279         struct nvmet_tcp_queue *queue =
1280                 container_of(w, struct nvmet_tcp_queue, io_work);
1281         bool pending;
1282         int ret, ops = 0;
1283
1284         do {
1285                 pending = false;
1286
1287                 ret = nvmet_tcp_try_recv(queue, NVMET_TCP_RECV_BUDGET, &ops);
1288                 if (ret > 0)
1289                         pending = true;
1290                 else if (ret < 0)
1291                         return;
1292
1293                 ret = nvmet_tcp_try_send(queue, NVMET_TCP_SEND_BUDGET, &ops);
1294                 if (ret > 0)
1295                         pending = true;
1296                 else if (ret < 0)
1297                         return;
1298
1299         } while (pending && ops < NVMET_TCP_IO_WORK_BUDGET);
1300
1301         /*
1302          * Requeue the worker if idle deadline period is in progress or any
1303          * ops activity was recorded during the do-while loop above.
1304          */
1305         if (nvmet_tcp_check_queue_deadline(queue, ops) || pending)
1306                 queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &queue->io_work);
1307 }
1308
1309 static int nvmet_tcp_alloc_cmd(struct nvmet_tcp_queue *queue,
1310                 struct nvmet_tcp_cmd *c)
1311 {
1312         u8 hdgst = nvmet_tcp_hdgst_len(queue);
1313
1314         c->queue = queue;
1315         c->req.port = queue->port->nport;
1316
1317         c->cmd_pdu = page_frag_alloc(&queue->pf_cache,
1318                         sizeof(*c->cmd_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1319         if (!c->cmd_pdu)
1320                 return -ENOMEM;
1321         c->req.cmd = &c->cmd_pdu->cmd;
1322
1323         c->rsp_pdu = page_frag_alloc(&queue->pf_cache,
1324                         sizeof(*c->rsp_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1325         if (!c->rsp_pdu)
1326                 goto out_free_cmd;
1327         c->req.cqe = &c->rsp_pdu->cqe;
1328
1329         c->data_pdu = page_frag_alloc(&queue->pf_cache,
1330                         sizeof(*c->data_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1331         if (!c->data_pdu)
1332                 goto out_free_rsp;
1333
1334         c->r2t_pdu = page_frag_alloc(&queue->pf_cache,
1335                         sizeof(*c->r2t_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1336         if (!c->r2t_pdu)
1337                 goto out_free_data;
1338
1339         c->recv_msg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL;
1340
1341         list_add_tail(&c->entry, &queue->free_list);
1342
1343         return 0;
1344 out_free_data:
1345         page_frag_free(c->data_pdu);
1346 out_free_rsp:
1347         page_frag_free(c->rsp_pdu);
1348 out_free_cmd:
1349         page_frag_free(c->cmd_pdu);
1350         return -ENOMEM;
1351 }
1352
1353 static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c)
1354 {
1355         page_frag_free(c->r2t_pdu);
1356         page_frag_free(c->data_pdu);
1357         page_frag_free(c->rsp_pdu);
1358         page_frag_free(c->cmd_pdu);
1359 }
1360
1361 static int nvmet_tcp_alloc_cmds(struct nvmet_tcp_queue *queue)
1362 {
1363         struct nvmet_tcp_cmd *cmds;
1364         int i, ret = -EINVAL, nr_cmds = queue->nr_cmds;
1365
1366         cmds = kcalloc(nr_cmds, sizeof(struct nvmet_tcp_cmd), GFP_KERNEL);
1367         if (!cmds)
1368                 goto out;
1369
1370         for (i = 0; i < nr_cmds; i++) {
1371                 ret = nvmet_tcp_alloc_cmd(queue, cmds + i);
1372                 if (ret)
1373                         goto out_free;
1374         }
1375
1376         queue->cmds = cmds;
1377
1378         return 0;
1379 out_free:
1380         while (--i >= 0)
1381                 nvmet_tcp_free_cmd(cmds + i);
1382         kfree(cmds);
1383 out:
1384         return ret;
1385 }
1386
1387 static void nvmet_tcp_free_cmds(struct nvmet_tcp_queue *queue)
1388 {
1389         struct nvmet_tcp_cmd *cmds = queue->cmds;
1390         int i;
1391
1392         for (i = 0; i < queue->nr_cmds; i++)
1393                 nvmet_tcp_free_cmd(cmds + i);
1394
1395         nvmet_tcp_free_cmd(&queue->connect);
1396         kfree(cmds);
1397 }
1398
1399 static void nvmet_tcp_restore_socket_callbacks(struct nvmet_tcp_queue *queue)
1400 {
1401         struct socket *sock = queue->sock;
1402
1403         write_lock_bh(&sock->sk->sk_callback_lock);
1404         sock->sk->sk_data_ready =  queue->data_ready;
1405         sock->sk->sk_state_change = queue->state_change;
1406         sock->sk->sk_write_space = queue->write_space;
1407         sock->sk->sk_user_data = NULL;
1408         write_unlock_bh(&sock->sk->sk_callback_lock);
1409 }
1410
1411 static void nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd *cmd)
1412 {
1413         nvmet_req_uninit(&cmd->req);
1414         nvmet_tcp_unmap_pdu_iovec(cmd);
1415         nvmet_tcp_free_cmd_buffers(cmd);
1416 }
1417
1418 static void nvmet_tcp_uninit_data_in_cmds(struct nvmet_tcp_queue *queue)
1419 {
1420         struct nvmet_tcp_cmd *cmd = queue->cmds;
1421         int i;
1422
1423         for (i = 0; i < queue->nr_cmds; i++, cmd++) {
1424                 if (nvmet_tcp_need_data_in(cmd))
1425                         nvmet_req_uninit(&cmd->req);
1426
1427                 nvmet_tcp_unmap_pdu_iovec(cmd);
1428                 nvmet_tcp_free_cmd_buffers(cmd);
1429         }
1430
1431         if (!queue->nr_cmds && nvmet_tcp_need_data_in(&queue->connect)) {
1432                 /* failed in connect */
1433                 nvmet_tcp_finish_cmd(&queue->connect);
1434         }
1435 }
1436
1437 static void nvmet_tcp_release_queue_work(struct work_struct *w)
1438 {
1439         struct page *page;
1440         struct nvmet_tcp_queue *queue =
1441                 container_of(w, struct nvmet_tcp_queue, release_work);
1442
1443         mutex_lock(&nvmet_tcp_queue_mutex);
1444         list_del_init(&queue->queue_list);
1445         mutex_unlock(&nvmet_tcp_queue_mutex);
1446
1447         nvmet_tcp_restore_socket_callbacks(queue);
1448         cancel_work_sync(&queue->io_work);
1449         /* stop accepting incoming data */
1450         queue->rcv_state = NVMET_TCP_RECV_ERR;
1451
1452         nvmet_tcp_uninit_data_in_cmds(queue);
1453         nvmet_sq_destroy(&queue->nvme_sq);
1454         cancel_work_sync(&queue->io_work);
1455         sock_release(queue->sock);
1456         nvmet_tcp_free_cmds(queue);
1457         if (queue->hdr_digest || queue->data_digest)
1458                 nvmet_tcp_free_crypto(queue);
1459         ida_free(&nvmet_tcp_queue_ida, queue->idx);
1460
1461         page = virt_to_head_page(queue->pf_cache.va);
1462         __page_frag_cache_drain(page, queue->pf_cache.pagecnt_bias);
1463         kfree(queue);
1464 }
1465
1466 static void nvmet_tcp_data_ready(struct sock *sk)
1467 {
1468         struct nvmet_tcp_queue *queue;
1469
1470         read_lock_bh(&sk->sk_callback_lock);
1471         queue = sk->sk_user_data;
1472         if (likely(queue))
1473                 queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &queue->io_work);
1474         read_unlock_bh(&sk->sk_callback_lock);
1475 }
1476
1477 static void nvmet_tcp_write_space(struct sock *sk)
1478 {
1479         struct nvmet_tcp_queue *queue;
1480
1481         read_lock_bh(&sk->sk_callback_lock);
1482         queue = sk->sk_user_data;
1483         if (unlikely(!queue))
1484                 goto out;
1485
1486         if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) {
1487                 queue->write_space(sk);
1488                 goto out;
1489         }
1490
1491         if (sk_stream_is_writeable(sk)) {
1492                 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1493                 queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &queue->io_work);
1494         }
1495 out:
1496         read_unlock_bh(&sk->sk_callback_lock);
1497 }
1498
1499 static void nvmet_tcp_state_change(struct sock *sk)
1500 {
1501         struct nvmet_tcp_queue *queue;
1502
1503         read_lock_bh(&sk->sk_callback_lock);
1504         queue = sk->sk_user_data;
1505         if (!queue)
1506                 goto done;
1507
1508         switch (sk->sk_state) {
1509         case TCP_FIN_WAIT1:
1510         case TCP_CLOSE_WAIT:
1511         case TCP_CLOSE:
1512                 /* FALLTHRU */
1513                 nvmet_tcp_schedule_release_queue(queue);
1514                 break;
1515         default:
1516                 pr_warn("queue %d unhandled state %d\n",
1517                         queue->idx, sk->sk_state);
1518         }
1519 done:
1520         read_unlock_bh(&sk->sk_callback_lock);
1521 }
1522
1523 static int nvmet_tcp_set_queue_sock(struct nvmet_tcp_queue *queue)
1524 {
1525         struct socket *sock = queue->sock;
1526         struct inet_sock *inet = inet_sk(sock->sk);
1527         int ret;
1528
1529         ret = kernel_getsockname(sock,
1530                 (struct sockaddr *)&queue->sockaddr);
1531         if (ret < 0)
1532                 return ret;
1533
1534         ret = kernel_getpeername(sock,
1535                 (struct sockaddr *)&queue->sockaddr_peer);
1536         if (ret < 0)
1537                 return ret;
1538
1539         /*
1540          * Cleanup whatever is sitting in the TCP transmit queue on socket
1541          * close. This is done to prevent stale data from being sent should
1542          * the network connection be restored before TCP times out.
1543          */
1544         sock_no_linger(sock->sk);
1545
1546         if (so_priority > 0)
1547                 sock_set_priority(sock->sk, so_priority);
1548
1549         /* Set socket type of service */
1550         if (inet->rcv_tos > 0)
1551                 ip_sock_set_tos(sock->sk, inet->rcv_tos);
1552
1553         ret = 0;
1554         write_lock_bh(&sock->sk->sk_callback_lock);
1555         if (sock->sk->sk_state != TCP_ESTABLISHED) {
1556                 /*
1557                  * If the socket is already closing, don't even start
1558                  * consuming it
1559                  */
1560                 ret = -ENOTCONN;
1561         } else {
1562                 sock->sk->sk_user_data = queue;
1563                 queue->data_ready = sock->sk->sk_data_ready;
1564                 sock->sk->sk_data_ready = nvmet_tcp_data_ready;
1565                 queue->state_change = sock->sk->sk_state_change;
1566                 sock->sk->sk_state_change = nvmet_tcp_state_change;
1567                 queue->write_space = sock->sk->sk_write_space;
1568                 sock->sk->sk_write_space = nvmet_tcp_write_space;
1569                 if (idle_poll_period_usecs)
1570                         nvmet_tcp_arm_queue_deadline(queue);
1571                 queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &queue->io_work);
1572         }
1573         write_unlock_bh(&sock->sk->sk_callback_lock);
1574
1575         return ret;
1576 }
1577
1578 static int nvmet_tcp_alloc_queue(struct nvmet_tcp_port *port,
1579                 struct socket *newsock)
1580 {
1581         struct nvmet_tcp_queue *queue;
1582         int ret;
1583
1584         queue = kzalloc(sizeof(*queue), GFP_KERNEL);
1585         if (!queue)
1586                 return -ENOMEM;
1587
1588         INIT_WORK(&queue->release_work, nvmet_tcp_release_queue_work);
1589         INIT_WORK(&queue->io_work, nvmet_tcp_io_work);
1590         queue->sock = newsock;
1591         queue->port = port;
1592         queue->nr_cmds = 0;
1593         spin_lock_init(&queue->state_lock);
1594         queue->state = NVMET_TCP_Q_CONNECTING;
1595         INIT_LIST_HEAD(&queue->free_list);
1596         init_llist_head(&queue->resp_list);
1597         INIT_LIST_HEAD(&queue->resp_send_list);
1598
1599         queue->idx = ida_alloc(&nvmet_tcp_queue_ida, GFP_KERNEL);
1600         if (queue->idx < 0) {
1601                 ret = queue->idx;
1602                 goto out_free_queue;
1603         }
1604
1605         ret = nvmet_tcp_alloc_cmd(queue, &queue->connect);
1606         if (ret)
1607                 goto out_ida_remove;
1608
1609         ret = nvmet_sq_init(&queue->nvme_sq);
1610         if (ret)
1611                 goto out_free_connect;
1612
1613         nvmet_prepare_receive_pdu(queue);
1614
1615         mutex_lock(&nvmet_tcp_queue_mutex);
1616         list_add_tail(&queue->queue_list, &nvmet_tcp_queue_list);
1617         mutex_unlock(&nvmet_tcp_queue_mutex);
1618
1619         ret = nvmet_tcp_set_queue_sock(queue);
1620         if (ret)
1621                 goto out_destroy_sq;
1622
1623         return 0;
1624 out_destroy_sq:
1625         mutex_lock(&nvmet_tcp_queue_mutex);
1626         list_del_init(&queue->queue_list);
1627         mutex_unlock(&nvmet_tcp_queue_mutex);
1628         nvmet_sq_destroy(&queue->nvme_sq);
1629 out_free_connect:
1630         nvmet_tcp_free_cmd(&queue->connect);
1631 out_ida_remove:
1632         ida_free(&nvmet_tcp_queue_ida, queue->idx);
1633 out_free_queue:
1634         kfree(queue);
1635         return ret;
1636 }
1637
1638 static void nvmet_tcp_accept_work(struct work_struct *w)
1639 {
1640         struct nvmet_tcp_port *port =
1641                 container_of(w, struct nvmet_tcp_port, accept_work);
1642         struct socket *newsock;
1643         int ret;
1644
1645         while (true) {
1646                 ret = kernel_accept(port->sock, &newsock, O_NONBLOCK);
1647                 if (ret < 0) {
1648                         if (ret != -EAGAIN)
1649                                 pr_warn("failed to accept err=%d\n", ret);
1650                         return;
1651                 }
1652                 ret = nvmet_tcp_alloc_queue(port, newsock);
1653                 if (ret) {
1654                         pr_err("failed to allocate queue\n");
1655                         sock_release(newsock);
1656                 }
1657         }
1658 }
1659
1660 static void nvmet_tcp_listen_data_ready(struct sock *sk)
1661 {
1662         struct nvmet_tcp_port *port;
1663
1664         read_lock_bh(&sk->sk_callback_lock);
1665         port = sk->sk_user_data;
1666         if (!port)
1667                 goto out;
1668
1669         if (sk->sk_state == TCP_LISTEN)
1670                 queue_work(nvmet_wq, &port->accept_work);
1671 out:
1672         read_unlock_bh(&sk->sk_callback_lock);
1673 }
1674
1675 static int nvmet_tcp_add_port(struct nvmet_port *nport)
1676 {
1677         struct nvmet_tcp_port *port;
1678         __kernel_sa_family_t af;
1679         int ret;
1680
1681         port = kzalloc(sizeof(*port), GFP_KERNEL);
1682         if (!port)
1683                 return -ENOMEM;
1684
1685         switch (nport->disc_addr.adrfam) {
1686         case NVMF_ADDR_FAMILY_IP4:
1687                 af = AF_INET;
1688                 break;
1689         case NVMF_ADDR_FAMILY_IP6:
1690                 af = AF_INET6;
1691                 break;
1692         default:
1693                 pr_err("address family %d not supported\n",
1694                                 nport->disc_addr.adrfam);
1695                 ret = -EINVAL;
1696                 goto err_port;
1697         }
1698
1699         ret = inet_pton_with_scope(&init_net, af, nport->disc_addr.traddr,
1700                         nport->disc_addr.trsvcid, &port->addr);
1701         if (ret) {
1702                 pr_err("malformed ip/port passed: %s:%s\n",
1703                         nport->disc_addr.traddr, nport->disc_addr.trsvcid);
1704                 goto err_port;
1705         }
1706
1707         port->nport = nport;
1708         INIT_WORK(&port->accept_work, nvmet_tcp_accept_work);
1709         if (port->nport->inline_data_size < 0)
1710                 port->nport->inline_data_size = NVMET_TCP_DEF_INLINE_DATA_SIZE;
1711
1712         ret = sock_create(port->addr.ss_family, SOCK_STREAM,
1713                                 IPPROTO_TCP, &port->sock);
1714         if (ret) {
1715                 pr_err("failed to create a socket\n");
1716                 goto err_port;
1717         }
1718
1719         port->sock->sk->sk_user_data = port;
1720         port->data_ready = port->sock->sk->sk_data_ready;
1721         port->sock->sk->sk_data_ready = nvmet_tcp_listen_data_ready;
1722         sock_set_reuseaddr(port->sock->sk);
1723         tcp_sock_set_nodelay(port->sock->sk);
1724         if (so_priority > 0)
1725                 sock_set_priority(port->sock->sk, so_priority);
1726
1727         ret = kernel_bind(port->sock, (struct sockaddr *)&port->addr,
1728                         sizeof(port->addr));
1729         if (ret) {
1730                 pr_err("failed to bind port socket %d\n", ret);
1731                 goto err_sock;
1732         }
1733
1734         ret = kernel_listen(port->sock, 128);
1735         if (ret) {
1736                 pr_err("failed to listen %d on port sock\n", ret);
1737                 goto err_sock;
1738         }
1739
1740         nport->priv = port;
1741         pr_info("enabling port %d (%pISpc)\n",
1742                 le16_to_cpu(nport->disc_addr.portid), &port->addr);
1743
1744         return 0;
1745
1746 err_sock:
1747         sock_release(port->sock);
1748 err_port:
1749         kfree(port);
1750         return ret;
1751 }
1752
1753 static void nvmet_tcp_destroy_port_queues(struct nvmet_tcp_port *port)
1754 {
1755         struct nvmet_tcp_queue *queue;
1756
1757         mutex_lock(&nvmet_tcp_queue_mutex);
1758         list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
1759                 if (queue->port == port)
1760                         kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1761         mutex_unlock(&nvmet_tcp_queue_mutex);
1762 }
1763
1764 static void nvmet_tcp_remove_port(struct nvmet_port *nport)
1765 {
1766         struct nvmet_tcp_port *port = nport->priv;
1767
1768         write_lock_bh(&port->sock->sk->sk_callback_lock);
1769         port->sock->sk->sk_data_ready = port->data_ready;
1770         port->sock->sk->sk_user_data = NULL;
1771         write_unlock_bh(&port->sock->sk->sk_callback_lock);
1772         cancel_work_sync(&port->accept_work);
1773         /*
1774          * Destroy the remaining queues, which are not belong to any
1775          * controller yet.
1776          */
1777         nvmet_tcp_destroy_port_queues(port);
1778
1779         sock_release(port->sock);
1780         kfree(port);
1781 }
1782
1783 static void nvmet_tcp_delete_ctrl(struct nvmet_ctrl *ctrl)
1784 {
1785         struct nvmet_tcp_queue *queue;
1786
1787         mutex_lock(&nvmet_tcp_queue_mutex);
1788         list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
1789                 if (queue->nvme_sq.ctrl == ctrl)
1790                         kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1791         mutex_unlock(&nvmet_tcp_queue_mutex);
1792 }
1793
1794 static u16 nvmet_tcp_install_queue(struct nvmet_sq *sq)
1795 {
1796         struct nvmet_tcp_queue *queue =
1797                 container_of(sq, struct nvmet_tcp_queue, nvme_sq);
1798
1799         if (sq->qid == 0) {
1800                 /* Let inflight controller teardown complete */
1801                 flush_workqueue(nvmet_wq);
1802         }
1803
1804         queue->nr_cmds = sq->size * 2;
1805         if (nvmet_tcp_alloc_cmds(queue))
1806                 return NVME_SC_INTERNAL;
1807         return 0;
1808 }
1809
1810 static void nvmet_tcp_disc_port_addr(struct nvmet_req *req,
1811                 struct nvmet_port *nport, char *traddr)
1812 {
1813         struct nvmet_tcp_port *port = nport->priv;
1814
1815         if (inet_addr_is_any((struct sockaddr *)&port->addr)) {
1816                 struct nvmet_tcp_cmd *cmd =
1817                         container_of(req, struct nvmet_tcp_cmd, req);
1818                 struct nvmet_tcp_queue *queue = cmd->queue;
1819
1820                 sprintf(traddr, "%pISc", (struct sockaddr *)&queue->sockaddr);
1821         } else {
1822                 memcpy(traddr, nport->disc_addr.traddr, NVMF_TRADDR_SIZE);
1823         }
1824 }
1825
1826 static const struct nvmet_fabrics_ops nvmet_tcp_ops = {
1827         .owner                  = THIS_MODULE,
1828         .type                   = NVMF_TRTYPE_TCP,
1829         .msdbd                  = 1,
1830         .add_port               = nvmet_tcp_add_port,
1831         .remove_port            = nvmet_tcp_remove_port,
1832         .queue_response         = nvmet_tcp_queue_response,
1833         .delete_ctrl            = nvmet_tcp_delete_ctrl,
1834         .install_queue          = nvmet_tcp_install_queue,
1835         .disc_traddr            = nvmet_tcp_disc_port_addr,
1836 };
1837
1838 static int __init nvmet_tcp_init(void)
1839 {
1840         int ret;
1841
1842         nvmet_tcp_wq = alloc_workqueue("nvmet_tcp_wq", WQ_HIGHPRI, 0);
1843         if (!nvmet_tcp_wq)
1844                 return -ENOMEM;
1845
1846         ret = nvmet_register_transport(&nvmet_tcp_ops);
1847         if (ret)
1848                 goto err;
1849
1850         return 0;
1851 err:
1852         destroy_workqueue(nvmet_tcp_wq);
1853         return ret;
1854 }
1855
1856 static void __exit nvmet_tcp_exit(void)
1857 {
1858         struct nvmet_tcp_queue *queue;
1859
1860         nvmet_unregister_transport(&nvmet_tcp_ops);
1861
1862         flush_workqueue(nvmet_wq);
1863         mutex_lock(&nvmet_tcp_queue_mutex);
1864         list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
1865                 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1866         mutex_unlock(&nvmet_tcp_queue_mutex);
1867         flush_workqueue(nvmet_wq);
1868
1869         destroy_workqueue(nvmet_tcp_wq);
1870 }
1871
1872 module_init(nvmet_tcp_init);
1873 module_exit(nvmet_tcp_exit);
1874
1875 MODULE_LICENSE("GPL v2");
1876 MODULE_ALIAS("nvmet-transport-3"); /* 3 == NVMF_TRTYPE_TCP */