drivers/nvme/host/rdma.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * NVMe over Fabrics RDMA host code.
   4  * Copyright (c) 2015-2016 HGST, a Western Digital Company.
   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 <rdma/mr_pool.h>
  11 #include <linux/err.h>
  12 #include <linux/string.h>
  13 #include <linux/atomic.h>
  14 #include <linux/blk-mq.h>
  15 #include <linux/blk-mq-rdma.h>
  16 #include <linux/types.h>
  17 #include <linux/list.h>
  18 #include <linux/mutex.h>
  19 #include <linux/scatterlist.h>
  20 #include <linux/nvme.h>
  21 #include <asm/unaligned.h>
  22
  23 #include <rdma/ib_verbs.h>
  24 #include <rdma/rdma_cm.h>
  25 #include <linux/nvme-rdma.h>
  26
  27 #include "nvme.h"
  28 #include "fabrics.h"
  29
  30
  31 #define NVME_RDMA_CONNECT_TIMEOUT_MS    3000            /* 3 second */
  32
  33 #define NVME_RDMA_MAX_SEGMENTS          256
  34
  35 #define NVME_RDMA_MAX_INLINE_SEGMENTS   4
  36
  37 #define NVME_RDMA_DATA_SGL_SIZE \
  38         (sizeof(struct scatterlist) * NVME_INLINE_SG_CNT)
  39 #define NVME_RDMA_METADATA_SGL_SIZE \
  40         (sizeof(struct scatterlist) * NVME_INLINE_METADATA_SG_CNT)
  41
  42 struct nvme_rdma_device {
  43         struct ib_device        *dev;
  44         struct ib_pd            *pd;
  45         struct kref             ref;
  46         struct list_head        entry;
  47         unsigned int            num_inline_segments;
  48 };
  49
  50 struct nvme_rdma_qe {
  51         struct ib_cqe           cqe;
  52         void                    *data;
  53         u64                     dma;
  54 };
  55
  56 struct nvme_rdma_sgl {
  57         int                     nents;
  58         struct sg_table         sg_table;
  59 };
  60
  61 struct nvme_rdma_queue;
  62 struct nvme_rdma_request {
  63         struct nvme_request     req;
  64         struct ib_mr            *mr;
  65         struct nvme_rdma_qe     sqe;
  66         union nvme_result       result;
  67         __le16                  status;
  68         refcount_t              ref;
  69         struct ib_sge           sge[1 + NVME_RDMA_MAX_INLINE_SEGMENTS];
  70         u32                     num_sge;
  71         struct ib_reg_wr        reg_wr;
  72         struct ib_cqe           reg_cqe;
  73         struct nvme_rdma_queue  *queue;
  74         struct nvme_rdma_sgl    data_sgl;
  75         struct nvme_rdma_sgl    *metadata_sgl;
  76         bool                    use_sig_mr;
  77 };
  78
  79 enum nvme_rdma_queue_flags {
  80         NVME_RDMA_Q_ALLOCATED           = 0,
  81         NVME_RDMA_Q_LIVE                = 1,
  82         NVME_RDMA_Q_TR_READY            = 2,
  83 };
  84
  85 struct nvme_rdma_queue {
  86         struct nvme_rdma_qe     *rsp_ring;
  87         int                     queue_size;
  88         size_t                  cmnd_capsule_len;
  89         struct nvme_rdma_ctrl   *ctrl;
  90         struct nvme_rdma_device *device;
  91         struct ib_cq            *ib_cq;
  92         struct ib_qp            *qp;
  93
  94         unsigned long           flags;
  95         struct rdma_cm_id       *cm_id;
  96         int                     cm_error;
  97         struct completion       cm_done;
  98         bool                    pi_support;
  99         int                     cq_size;
 100 };
 101
 102 struct nvme_rdma_ctrl {
 103         /* read only in the hot path */
 104         struct nvme_rdma_queue  *queues;
 105
 106         /* other member variables */
 107         struct blk_mq_tag_set   tag_set;
 108         struct work_struct      err_work;
 109
 110         struct nvme_rdma_qe     async_event_sqe;
 111
 112         struct delayed_work     reconnect_work;
 113
 114         struct list_head        list;
 115
 116         struct blk_mq_tag_set   admin_tag_set;
 117         struct nvme_rdma_device *device;
 118
 119         u32                     max_fr_pages;
 120
 121         struct sockaddr_storage addr;
 122         struct sockaddr_storage src_addr;
 123
 124         struct nvme_ctrl        ctrl;
 125         bool                    use_inline_data;
 126         u32                     io_queues[HCTX_MAX_TYPES];
 127 };
 128
 129 static inline struct nvme_rdma_ctrl *to_rdma_ctrl(struct nvme_ctrl *ctrl)
 130 {
 131         return container_of(ctrl, struct nvme_rdma_ctrl, ctrl);
 132 }
 133
 134 static LIST_HEAD(device_list);
 135 static DEFINE_MUTEX(device_list_mutex);
 136
 137 static LIST_HEAD(nvme_rdma_ctrl_list);
 138 static DEFINE_MUTEX(nvme_rdma_ctrl_mutex);
 139
 140 /*
 141  * Disabling this option makes small I/O goes faster, but is fundamentally
 142  * unsafe.  With it turned off we will have to register a global rkey that
 143  * allows read and write access to all physical memory.
 144  */
 145 static bool register_always = true;
 146 module_param(register_always, bool, 0444);
 147 MODULE_PARM_DESC(register_always,
 148          "Use memory registration even for contiguous memory regions");
 149
 150 static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
 151                 struct rdma_cm_event *event);
 152 static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
 153 static void nvme_rdma_complete_rq(struct request *rq);
 154
 155 static const struct blk_mq_ops nvme_rdma_mq_ops;
 156 static const struct blk_mq_ops nvme_rdma_admin_mq_ops;
 157
 158 static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue *queue)
 159 {
 160         return queue - queue->ctrl->queues;
 161 }
 162
 163 static bool nvme_rdma_poll_queue(struct nvme_rdma_queue *queue)
 164 {
 165         return nvme_rdma_queue_idx(queue) >
 166                 queue->ctrl->io_queues[HCTX_TYPE_DEFAULT] +
 167                 queue->ctrl->io_queues[HCTX_TYPE_READ];
 168 }
 169
 170 static inline size_t nvme_rdma_inline_data_size(struct nvme_rdma_queue *queue)
 171 {
 172         return queue->cmnd_capsule_len - sizeof(struct nvme_command);
 173 }
 174
 175 static void nvme_rdma_free_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
 176                 size_t capsule_size, enum dma_data_direction dir)
 177 {
 178         ib_dma_unmap_single(ibdev, qe->dma, capsule_size, dir);
 179         kfree(qe->data);
 180 }
 181
 182 static int nvme_rdma_alloc_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
 183                 size_t capsule_size, enum dma_data_direction dir)
 184 {
 185         qe->data = kzalloc(capsule_size, GFP_KERNEL);
 186         if (!qe->data)
 187                 return -ENOMEM;
 188
 189         qe->dma = ib_dma_map_single(ibdev, qe->data, capsule_size, dir);
 190         if (ib_dma_mapping_error(ibdev, qe->dma)) {
 191                 kfree(qe->data);
 192                 qe->data = NULL;
 193                 return -ENOMEM;
 194         }
 195
 196         return 0;
 197 }
 198
 199 static void nvme_rdma_free_ring(struct ib_device *ibdev,
 200                 struct nvme_rdma_qe *ring, size_t ib_queue_size,
 201                 size_t capsule_size, enum dma_data_direction dir)
 202 {
 203         int i;
 204
 205         for (i = 0; i < ib_queue_size; i++)
 206                 nvme_rdma_free_qe(ibdev, &ring[i], capsule_size, dir);
 207         kfree(ring);
 208 }
 209
 210 static struct nvme_rdma_qe *nvme_rdma_alloc_ring(struct ib_device *ibdev,
 211                 size_t ib_queue_size, size_t capsule_size,
 212                 enum dma_data_direction dir)
 213 {
 214         struct nvme_rdma_qe *ring;
 215         int i;
 216
 217         ring = kcalloc(ib_queue_size, sizeof(struct nvme_rdma_qe), GFP_KERNEL);
 218         if (!ring)
 219                 return NULL;
 220
 221         /*
 222          * Bind the CQEs (post recv buffers) DMA mapping to the RDMA queue
 223          * lifetime. It's safe, since any chage in the underlying RDMA device
 224          * will issue error recovery and queue re-creation.
 225          */
 226         for (i = 0; i < ib_queue_size; i++) {
 227                 if (nvme_rdma_alloc_qe(ibdev, &ring[i], capsule_size, dir))
 228                         goto out_free_ring;
 229         }
 230
 231         return ring;
 232
 233 out_free_ring:
 234         nvme_rdma_free_ring(ibdev, ring, i, capsule_size, dir);
 235         return NULL;
 236 }
 237
 238 static void nvme_rdma_qp_event(struct ib_event *event, void *context)
 239 {
 240         pr_debug("QP event %s (%d)\n",
 241                  ib_event_msg(event->event), event->event);
 242
 243 }
 244
 245 static int nvme_rdma_wait_for_cm(struct nvme_rdma_queue *queue)
 246 {
 247         int ret;
 248
 249         ret = wait_for_completion_interruptible_timeout(&queue->cm_done,
 250                         msecs_to_jiffies(NVME_RDMA_CONNECT_TIMEOUT_MS) + 1);
 251         if (ret < 0)
 252                 return ret;
 253         if (ret == 0)
 254                 return -ETIMEDOUT;
 255         WARN_ON_ONCE(queue->cm_error > 0);
 256         return queue->cm_error;
 257 }
 258
 259 static int nvme_rdma_create_qp(struct nvme_rdma_queue *queue, const int factor)
 260 {
 261         struct nvme_rdma_device *dev = queue->device;
 262         struct ib_qp_init_attr init_attr;
 263         int ret;
 264
 265         memset(&init_attr, 0, sizeof(init_attr));
 266         init_attr.event_handler = nvme_rdma_qp_event;
 267         /* +1 for drain */
 268         init_attr.cap.max_send_wr = factor * queue->queue_size + 1;
 269         /* +1 for drain */
 270         init_attr.cap.max_recv_wr = queue->queue_size + 1;
 271         init_attr.cap.max_recv_sge = 1;
 272         init_attr.cap.max_send_sge = 1 + dev->num_inline_segments;
 273         init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 274         init_attr.qp_type = IB_QPT_RC;
 275         init_attr.send_cq = queue->ib_cq;
 276         init_attr.recv_cq = queue->ib_cq;
 277         if (queue->pi_support)
 278                 init_attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN;
 279         init_attr.qp_context = queue;
 280
 281         ret = rdma_create_qp(queue->cm_id, dev->pd, &init_attr);
 282
 283         queue->qp = queue->cm_id->qp;
 284         return ret;
 285 }
 286
 287 static void nvme_rdma_exit_request(struct blk_mq_tag_set *set,
 288                 struct request *rq, unsigned int hctx_idx)
 289 {
 290         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
 291
 292         kfree(req->sqe.data);
 293 }
 294
 295 static int nvme_rdma_init_request(struct blk_mq_tag_set *set,
 296                 struct request *rq, unsigned int hctx_idx,
 297                 unsigned int numa_node)
 298 {
 299         struct nvme_rdma_ctrl *ctrl = set->driver_data;
 300         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
 301         int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0;
 302         struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];
 303
 304         nvme_req(rq)->ctrl = &ctrl->ctrl;
 305         req->sqe.data = kzalloc(sizeof(struct nvme_command), GFP_KERNEL);
 306         if (!req->sqe.data)
 307                 return -ENOMEM;
 308
 309         /* metadata nvme_rdma_sgl struct is located after command's data SGL */
 310         if (queue->pi_support)
 311                 req->metadata_sgl = (void *)nvme_req(rq) +
 312                         sizeof(struct nvme_rdma_request) +
 313                         NVME_RDMA_DATA_SGL_SIZE;
 314
 315         req->queue = queue;
 316
 317         return 0;
 318 }
 319
 320 static int nvme_rdma_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
 321                 unsigned int hctx_idx)
 322 {
 323         struct nvme_rdma_ctrl *ctrl = data;
 324         struct nvme_rdma_queue *queue = &ctrl->queues[hctx_idx + 1];
 325
 326         BUG_ON(hctx_idx >= ctrl->ctrl.queue_count);
 327
 328         hctx->driver_data = queue;
 329         return 0;
 330 }
 331
 332 static int nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
 333                 unsigned int hctx_idx)
 334 {
 335         struct nvme_rdma_ctrl *ctrl = data;
 336         struct nvme_rdma_queue *queue = &ctrl->queues[0];
 337
 338         BUG_ON(hctx_idx != 0);
 339
 340         hctx->driver_data = queue;
 341         return 0;
 342 }
 343
 344 static void nvme_rdma_free_dev(struct kref *ref)
 345 {
 346         struct nvme_rdma_device *ndev =
 347                 container_of(ref, struct nvme_rdma_device, ref);
 348
 349         mutex_lock(&device_list_mutex);
 350         list_del(&ndev->entry);
 351         mutex_unlock(&device_list_mutex);
 352
 353         ib_dealloc_pd(ndev->pd);
 354         kfree(ndev);
 355 }
 356
 357 static void nvme_rdma_dev_put(struct nvme_rdma_device *dev)
 358 {
 359         kref_put(&dev->ref, nvme_rdma_free_dev);
 360 }
 361
 362 static int nvme_rdma_dev_get(struct nvme_rdma_device *dev)
 363 {
 364         return kref_get_unless_zero(&dev->ref);
 365 }
 366
 367 static struct nvme_rdma_device *
 368 nvme_rdma_find_get_device(struct rdma_cm_id *cm_id)
 369 {
 370         struct nvme_rdma_device *ndev;
 371
 372         mutex_lock(&device_list_mutex);
 373         list_for_each_entry(ndev, &device_list, entry) {
 374                 if (ndev->dev->node_guid == cm_id->device->node_guid &&
 375                     nvme_rdma_dev_get(ndev))
 376                         goto out_unlock;
 377         }
 378
 379         ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
 380         if (!ndev)
 381                 goto out_err;
 382
 383         ndev->dev = cm_id->device;
 384         kref_init(&ndev->ref);
 385
 386         ndev->pd = ib_alloc_pd(ndev->dev,
 387                 register_always ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY);
 388         if (IS_ERR(ndev->pd))
 389                 goto out_free_dev;
 390
 391         if (!(ndev->dev->attrs.device_cap_flags &
 392               IB_DEVICE_MEM_MGT_EXTENSIONS)) {
 393                 dev_err(&ndev->dev->dev,
 394                         "Memory registrations not supported.\n");
 395                 goto out_free_pd;
 396         }
 397
 398         ndev->num_inline_segments = min(NVME_RDMA_MAX_INLINE_SEGMENTS,
 399                                         ndev->dev->attrs.max_send_sge - 1);
 400         list_add(&ndev->entry, &device_list);
 401 out_unlock:
 402         mutex_unlock(&device_list_mutex);
 403         return ndev;
 404
 405 out_free_pd:
 406         ib_dealloc_pd(ndev->pd);
 407 out_free_dev:
 408         kfree(ndev);
 409 out_err:
 410         mutex_unlock(&device_list_mutex);
 411         return NULL;
 412 }
 413
 414 static void nvme_rdma_free_cq(struct nvme_rdma_queue *queue)
 415 {
 416         if (nvme_rdma_poll_queue(queue))
 417                 ib_free_cq(queue->ib_cq);
 418         else
 419                 ib_cq_pool_put(queue->ib_cq, queue->cq_size);
 420 }
 421
 422 static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue *queue)
 423 {
 424         struct nvme_rdma_device *dev;
 425         struct ib_device *ibdev;
 426
 427         if (!test_and_clear_bit(NVME_RDMA_Q_TR_READY, &queue->flags))
 428                 return;
 429
 430         dev = queue->device;
 431         ibdev = dev->dev;
 432
 433         if (queue->pi_support)
 434                 ib_mr_pool_destroy(queue->qp, &queue->qp->sig_mrs);
 435         ib_mr_pool_destroy(queue->qp, &queue->qp->rdma_mrs);
 436
 437         /*
 438          * The cm_id object might have been destroyed during RDMA connection
 439          * establishment error flow to avoid getting other cma events, thus
 440          * the destruction of the QP shouldn't use rdma_cm API.
 441          */
 442         ib_destroy_qp(queue->qp);
 443         nvme_rdma_free_cq(queue);
 444
 445         nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,
 446                         sizeof(struct nvme_completion), DMA_FROM_DEVICE);
 447
 448         nvme_rdma_dev_put(dev);
 449 }
 450
 451 static int nvme_rdma_get_max_fr_pages(struct ib_device *ibdev, bool pi_support)
 452 {
 453         u32 max_page_list_len;
 454
 455         if (pi_support)
 456                 max_page_list_len = ibdev->attrs.max_pi_fast_reg_page_list_len;
 457         else
 458                 max_page_list_len = ibdev->attrs.max_fast_reg_page_list_len;
 459
 460         return min_t(u32, NVME_RDMA_MAX_SEGMENTS, max_page_list_len - 1);
 461 }
 462
 463 static int nvme_rdma_create_cq(struct ib_device *ibdev,
 464                 struct nvme_rdma_queue *queue)
 465 {
 466         int ret, comp_vector, idx = nvme_rdma_queue_idx(queue);
 467         enum ib_poll_context poll_ctx;
 468
 469         /*
 470          * Spread I/O queues completion vectors according their queue index.
 471          * Admin queues can always go on completion vector 0.
 472          */
 473         comp_vector = (idx == 0 ? idx : idx - 1) % ibdev->num_comp_vectors;
 474
 475         /* Polling queues need direct cq polling context */
 476         if (nvme_rdma_poll_queue(queue)) {
 477                 poll_ctx = IB_POLL_DIRECT;
 478                 queue->ib_cq = ib_alloc_cq(ibdev, queue, queue->cq_size,
 479                                            comp_vector, poll_ctx);
 480         } else {
 481                 poll_ctx = IB_POLL_SOFTIRQ;
 482                 queue->ib_cq = ib_cq_pool_get(ibdev, queue->cq_size,
 483                                               comp_vector, poll_ctx);
 484         }
 485
 486         if (IS_ERR(queue->ib_cq)) {
 487                 ret = PTR_ERR(queue->ib_cq);
 488                 return ret;
 489         }
 490
 491         return 0;
 492 }
 493
 494 static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue *queue)
 495 {
 496         struct ib_device *ibdev;
 497         const int send_wr_factor = 3;                   /* MR, SEND, INV */
 498         const int cq_factor = send_wr_factor + 1;       /* + RECV */
 499         int ret, pages_per_mr;
 500
 501         queue->device = nvme_rdma_find_get_device(queue->cm_id);
 502         if (!queue->device) {
 503                 dev_err(queue->cm_id->device->dev.parent,
 504                         "no client data found!\n");
 505                 return -ECONNREFUSED;
 506         }
 507         ibdev = queue->device->dev;
 508
 509         /* +1 for ib_stop_cq */
 510         queue->cq_size = cq_factor * queue->queue_size + 1;
 511
 512         ret = nvme_rdma_create_cq(ibdev, queue);
 513         if (ret)
 514                 goto out_put_dev;
 515
 516         ret = nvme_rdma_create_qp(queue, send_wr_factor);
 517         if (ret)
 518                 goto out_destroy_ib_cq;
 519
 520         queue->rsp_ring = nvme_rdma_alloc_ring(ibdev, queue->queue_size,
 521                         sizeof(struct nvme_completion), DMA_FROM_DEVICE);
 522         if (!queue->rsp_ring) {
 523                 ret = -ENOMEM;
 524                 goto out_destroy_qp;
 525         }
 526
 527         /*
 528          * Currently we don't use SG_GAPS MR's so if the first entry is
 529          * misaligned we'll end up using two entries for a single data page,
 530          * so one additional entry is required.
 531          */
 532         pages_per_mr = nvme_rdma_get_max_fr_pages(ibdev, queue->pi_support) + 1;
 533         ret = ib_mr_pool_init(queue->qp, &queue->qp->rdma_mrs,
 534                               queue->queue_size,
 535                               IB_MR_TYPE_MEM_REG,
 536                               pages_per_mr, 0);
 537         if (ret) {
 538                 dev_err(queue->ctrl->ctrl.device,
 539                         "failed to initialize MR pool sized %d for QID %d\n",
 540                         queue->queue_size, nvme_rdma_queue_idx(queue));
 541                 goto out_destroy_ring;
 542         }
 543
 544         if (queue->pi_support) {
 545                 ret = ib_mr_pool_init(queue->qp, &queue->qp->sig_mrs,
 546                                       queue->queue_size, IB_MR_TYPE_INTEGRITY,
 547                                       pages_per_mr, pages_per_mr);
 548                 if (ret) {
 549                         dev_err(queue->ctrl->ctrl.device,
 550                                 "failed to initialize PI MR pool sized %d for QID %d\n",
 551                                 queue->queue_size, nvme_rdma_queue_idx(queue));
 552                         goto out_destroy_mr_pool;
 553                 }
 554         }
 555
 556         set_bit(NVME_RDMA_Q_TR_READY, &queue->flags);
 557
 558         return 0;
 559
 560 out_destroy_mr_pool:
 561         ib_mr_pool_destroy(queue->qp, &queue->qp->rdma_mrs);
 562 out_destroy_ring:
 563         nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,
 564                             sizeof(struct nvme_completion), DMA_FROM_DEVICE);
 565 out_destroy_qp:
 566         rdma_destroy_qp(queue->cm_id);
 567 out_destroy_ib_cq:
 568         nvme_rdma_free_cq(queue);
 569 out_put_dev:
 570         nvme_rdma_dev_put(queue->device);
 571         return ret;
 572 }
 573
 574 static int nvme_rdma_alloc_queue(struct nvme_rdma_ctrl *ctrl,
 575                 int idx, size_t queue_size)
 576 {
 577         struct nvme_rdma_queue *queue;
 578         struct sockaddr *src_addr = NULL;
 579         int ret;
 580
 581         queue = &ctrl->queues[idx];
 582         queue->ctrl = ctrl;
 583         if (idx && ctrl->ctrl.max_integrity_segments)
 584                 queue->pi_support = true;
 585         else
 586                 queue->pi_support = false;
 587         init_completion(&queue->cm_done);
 588
 589         if (idx > 0)
 590                 queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16;
 591         else
 592                 queue->cmnd_capsule_len = sizeof(struct nvme_command);
 593
 594         queue->queue_size = queue_size;
 595
 596         queue->cm_id = rdma_create_id(&init_net, nvme_rdma_cm_handler, queue,
 597                         RDMA_PS_TCP, IB_QPT_RC);
 598         if (IS_ERR(queue->cm_id)) {
 599                 dev_info(ctrl->ctrl.device,
 600                         "failed to create CM ID: %ld\n", PTR_ERR(queue->cm_id));
 601                 return PTR_ERR(queue->cm_id);
 602         }
 603
 604         if (ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR)
 605                 src_addr = (struct sockaddr *)&ctrl->src_addr;
 606
 607         queue->cm_error = -ETIMEDOUT;
 608         ret = rdma_resolve_addr(queue->cm_id, src_addr,
 609                         (struct sockaddr *)&ctrl->addr,
 610                         NVME_RDMA_CONNECT_TIMEOUT_MS);
 611         if (ret) {
 612                 dev_info(ctrl->ctrl.device,
 613                         "rdma_resolve_addr failed (%d).\n", ret);
 614                 goto out_destroy_cm_id;
 615         }
 616
 617         ret = nvme_rdma_wait_for_cm(queue);
 618         if (ret) {
 619                 dev_info(ctrl->ctrl.device,
 620                         "rdma connection establishment failed (%d)\n", ret);
 621                 goto out_destroy_cm_id;
 622         }
 623
 624         set_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags);
 625
 626         return 0;
 627
 628 out_destroy_cm_id:
 629         rdma_destroy_id(queue->cm_id);
 630         nvme_rdma_destroy_queue_ib(queue);
 631         return ret;
 632 }
 633
 634 static void __nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
 635 {
 636         rdma_disconnect(queue->cm_id);
 637         ib_drain_qp(queue->qp);
 638 }
 639
 640 static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
 641 {
 642         if (!test_and_clear_bit(NVME_RDMA_Q_LIVE, &queue->flags))
 643                 return;
 644         __nvme_rdma_stop_queue(queue);
 645 }
 646
 647 static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue)
 648 {
 649         if (!test_and_clear_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags))
 650                 return;
 651
 652         nvme_rdma_destroy_queue_ib(queue);
 653         rdma_destroy_id(queue->cm_id);
 654 }
 655
 656 static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl *ctrl)
 657 {
 658         int i;
 659
 660         for (i = 1; i < ctrl->ctrl.queue_count; i++)
 661                 nvme_rdma_free_queue(&ctrl->queues[i]);
 662 }
 663
 664 static void nvme_rdma_stop_io_queues(struct nvme_rdma_ctrl *ctrl)
 665 {
 666         int i;
 667
 668         for (i = 1; i < ctrl->ctrl.queue_count; i++)
 669                 nvme_rdma_stop_queue(&ctrl->queues[i]);
 670 }
 671
 672 static int nvme_rdma_start_queue(struct nvme_rdma_ctrl *ctrl, int idx)
 673 {
 674         struct nvme_rdma_queue *queue = &ctrl->queues[idx];
 675         bool poll = nvme_rdma_poll_queue(queue);
 676         int ret;
 677
 678         if (idx)
 679                 ret = nvmf_connect_io_queue(&ctrl->ctrl, idx, poll);
 680         else
 681                 ret = nvmf_connect_admin_queue(&ctrl->ctrl);
 682
 683         if (!ret) {
 684                 set_bit(NVME_RDMA_Q_LIVE, &queue->flags);
 685         } else {
 686                 if (test_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags))
 687                         __nvme_rdma_stop_queue(queue);
 688                 dev_info(ctrl->ctrl.device,
 689                         "failed to connect queue: %d ret=%d\n", idx, ret);
 690         }
 691         return ret;
 692 }
 693
 694 static int nvme_rdma_start_io_queues(struct nvme_rdma_ctrl *ctrl)
 695 {
 696         int i, ret = 0;
 697
 698         for (i = 1; i < ctrl->ctrl.queue_count; i++) {
 699                 ret = nvme_rdma_start_queue(ctrl, i);
 700                 if (ret)
 701                         goto out_stop_queues;
 702         }
 703
 704         return 0;
 705
 706 out_stop_queues:
 707         for (i--; i >= 1; i--)
 708                 nvme_rdma_stop_queue(&ctrl->queues[i]);
 709         return ret;
 710 }
 711
 712 static int nvme_rdma_alloc_io_queues(struct nvme_rdma_ctrl *ctrl)
 713 {
 714         struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
 715         struct ib_device *ibdev = ctrl->device->dev;
 716         unsigned int nr_io_queues, nr_default_queues;
 717         unsigned int nr_read_queues, nr_poll_queues;
 718         int i, ret;
 719
 720         nr_read_queues = min_t(unsigned int, ibdev->num_comp_vectors,
 721                                 min(opts->nr_io_queues, num_online_cpus()));
 722         nr_default_queues =  min_t(unsigned int, ibdev->num_comp_vectors,
 723                                 min(opts->nr_write_queues, num_online_cpus()));
 724         nr_poll_queues = min(opts->nr_poll_queues, num_online_cpus());
 725         nr_io_queues = nr_read_queues + nr_default_queues + nr_poll_queues;
 726
 727         ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);
 728         if (ret)
 729                 return ret;
 730
 731         ctrl->ctrl.queue_count = nr_io_queues + 1;
 732         if (ctrl->ctrl.queue_count < 2)
 733                 return 0;
 734
 735         dev_info(ctrl->ctrl.device,
 736                 "creating %d I/O queues.\n", nr_io_queues);
 737
 738         if (opts->nr_write_queues && nr_read_queues < nr_io_queues) {
 739                 /*
 740                  * separate read/write queues
 741                  * hand out dedicated default queues only after we have
 742                  * sufficient read queues.
 743                  */
 744                 ctrl->io_queues[HCTX_TYPE_READ] = nr_read_queues;
 745                 nr_io_queues -= ctrl->io_queues[HCTX_TYPE_READ];
 746                 ctrl->io_queues[HCTX_TYPE_DEFAULT] =
 747                         min(nr_default_queues, nr_io_queues);
 748                 nr_io_queues -= ctrl->io_queues[HCTX_TYPE_DEFAULT];
 749         } else {
 750                 /*
 751                  * shared read/write queues
 752                  * either no write queues were requested, or we don't have
 753                  * sufficient queue count to have dedicated default queues.
 754                  */
 755                 ctrl->io_queues[HCTX_TYPE_DEFAULT] =
 756                         min(nr_read_queues, nr_io_queues);
 757                 nr_io_queues -= ctrl->io_queues[HCTX_TYPE_DEFAULT];
 758         }
 759
 760         if (opts->nr_poll_queues && nr_io_queues) {
 761                 /* map dedicated poll queues only if we have queues left */
 762                 ctrl->io_queues[HCTX_TYPE_POLL] =
 763                         min(nr_poll_queues, nr_io_queues);
 764         }
 765
 766         for (i = 1; i < ctrl->ctrl.queue_count; i++) {
 767                 ret = nvme_rdma_alloc_queue(ctrl, i,
 768                                 ctrl->ctrl.sqsize + 1);
 769                 if (ret)
 770                         goto out_free_queues;
 771         }
 772
 773         return 0;
 774
 775 out_free_queues:
 776         for (i--; i >= 1; i--)
 777                 nvme_rdma_free_queue(&ctrl->queues[i]);
 778
 779         return ret;
 780 }
 781
 782 static struct blk_mq_tag_set *nvme_rdma_alloc_tagset(struct nvme_ctrl *nctrl,
 783                 bool admin)
 784 {
 785         struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
 786         struct blk_mq_tag_set *set;
 787         int ret;
 788
 789         if (admin) {
 790                 set = &ctrl->admin_tag_set;
 791                 memset(set, 0, sizeof(*set));
 792                 set->ops = &nvme_rdma_admin_mq_ops;
 793                 set->queue_depth = NVME_AQ_MQ_TAG_DEPTH;
 794                 set->reserved_tags = 2; /* connect + keep-alive */
 795                 set->numa_node = nctrl->numa_node;
 796                 set->cmd_size = sizeof(struct nvme_rdma_request) +
 797                                 NVME_RDMA_DATA_SGL_SIZE;
 798                 set->driver_data = ctrl;
 799                 set->nr_hw_queues = 1;
 800                 set->timeout = ADMIN_TIMEOUT;
 801                 set->flags = BLK_MQ_F_NO_SCHED;
 802         } else {
 803                 set = &ctrl->tag_set;
 804                 memset(set, 0, sizeof(*set));
 805                 set->ops = &nvme_rdma_mq_ops;
 806                 set->queue_depth = nctrl->sqsize + 1;
 807                 set->reserved_tags = 1; /* fabric connect */
 808                 set->numa_node = nctrl->numa_node;
 809                 set->flags = BLK_MQ_F_SHOULD_MERGE;
 810                 set->cmd_size = sizeof(struct nvme_rdma_request) +
 811                                 NVME_RDMA_DATA_SGL_SIZE;
 812                 if (nctrl->max_integrity_segments)
 813                         set->cmd_size += sizeof(struct nvme_rdma_sgl) +
 814                                          NVME_RDMA_METADATA_SGL_SIZE;
 815                 set->driver_data = ctrl;
 816                 set->nr_hw_queues = nctrl->queue_count - 1;
 817                 set->timeout = NVME_IO_TIMEOUT;
 818                 set->nr_maps = nctrl->opts->nr_poll_queues ? HCTX_MAX_TYPES : 2;
 819         }
 820
 821         ret = blk_mq_alloc_tag_set(set);
 822         if (ret)
 823                 return ERR_PTR(ret);
 824
 825         return set;
 826 }
 827
 828 static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl,
 829                 bool remove)
 830 {
 831         if (remove) {
 832                 blk_cleanup_queue(ctrl->ctrl.admin_q);
 833                 blk_cleanup_queue(ctrl->ctrl.fabrics_q);
 834                 blk_mq_free_tag_set(ctrl->ctrl.admin_tagset);
 835         }
 836         if (ctrl->async_event_sqe.data) {
 837                 nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,
 838                                 sizeof(struct nvme_command), DMA_TO_DEVICE);
 839                 ctrl->async_event_sqe.data = NULL;
 840         }
 841         nvme_rdma_free_queue(&ctrl->queues[0]);
 842 }
 843
 844 static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl,
 845                 bool new)
 846 {
 847         bool pi_capable = false;
 848         int error;
 849
 850         error = nvme_rdma_alloc_queue(ctrl, 0, NVME_AQ_DEPTH);
 851         if (error)
 852                 return error;
 853
 854         ctrl->device = ctrl->queues[0].device;
 855         ctrl->ctrl.numa_node = dev_to_node(ctrl->device->dev->dma_device);
 856
 857         /* T10-PI support */
 858         if (ctrl->device->dev->attrs.device_cap_flags &
 859             IB_DEVICE_INTEGRITY_HANDOVER)
 860                 pi_capable = true;
 861
 862         ctrl->max_fr_pages = nvme_rdma_get_max_fr_pages(ctrl->device->dev,
 863                                                         pi_capable);
 864
 865         /*
 866          * Bind the async event SQE DMA mapping to the admin queue lifetime.
 867          * It's safe, since any chage in the underlying RDMA device will issue
 868          * error recovery and queue re-creation.
 869          */
 870         error = nvme_rdma_alloc_qe(ctrl->device->dev, &ctrl->async_event_sqe,
 871                         sizeof(struct nvme_command), DMA_TO_DEVICE);
 872         if (error)
 873                 goto out_free_queue;
 874
 875         if (new) {
 876                 ctrl->ctrl.admin_tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, true);
 877                 if (IS_ERR(ctrl->ctrl.admin_tagset)) {
 878                         error = PTR_ERR(ctrl->ctrl.admin_tagset);
 879                         goto out_free_async_qe;
 880                 }
 881
 882                 ctrl->ctrl.fabrics_q = blk_mq_init_queue(&ctrl->admin_tag_set);
 883                 if (IS_ERR(ctrl->ctrl.fabrics_q)) {
 884                         error = PTR_ERR(ctrl->ctrl.fabrics_q);
 885                         goto out_free_tagset;
 886                 }
 887
 888                 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
 889                 if (IS_ERR(ctrl->ctrl.admin_q)) {
 890                         error = PTR_ERR(ctrl->ctrl.admin_q);
 891                         goto out_cleanup_fabrics_q;
 892                 }
 893         }
 894
 895         error = nvme_rdma_start_queue(ctrl, 0);
 896         if (error)
 897                 goto out_cleanup_queue;
 898
 899         error = nvme_enable_ctrl(&ctrl->ctrl);
 900         if (error)
 901                 goto out_stop_queue;
 902
 903         ctrl->ctrl.max_segments = ctrl->max_fr_pages;
 904         ctrl->ctrl.max_hw_sectors = ctrl->max_fr_pages << (ilog2(SZ_4K) - 9);
 905         if (pi_capable)
 906                 ctrl->ctrl.max_integrity_segments = ctrl->max_fr_pages;
 907         else
 908                 ctrl->ctrl.max_integrity_segments = 0;
 909
 910         blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
 911
 912         error = nvme_init_identify(&ctrl->ctrl);
 913         if (error)
 914                 goto out_stop_queue;
 915
 916         return 0;
 917
 918 out_stop_queue:
 919         nvme_rdma_stop_queue(&ctrl->queues[0]);
 920 out_cleanup_queue:
 921         if (new)
 922                 blk_cleanup_queue(ctrl->ctrl.admin_q);
 923 out_cleanup_fabrics_q:
 924         if (new)
 925                 blk_cleanup_queue(ctrl->ctrl.fabrics_q);
 926 out_free_tagset:
 927         if (new)
 928                 blk_mq_free_tag_set(ctrl->ctrl.admin_tagset);
 929 out_free_async_qe:
 930         if (ctrl->async_event_sqe.data) {
 931                 nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,
 932                         sizeof(struct nvme_command), DMA_TO_DEVICE);
 933                 ctrl->async_event_sqe.data = NULL;
 934         }
 935 out_free_queue:
 936         nvme_rdma_free_queue(&ctrl->queues[0]);
 937         return error;
 938 }
 939
 940 static void nvme_rdma_destroy_io_queues(struct nvme_rdma_ctrl *ctrl,
 941                 bool remove)
 942 {
 943         if (remove) {
 944                 blk_cleanup_queue(ctrl->ctrl.connect_q);
 945                 blk_mq_free_tag_set(ctrl->ctrl.tagset);
 946         }
 947         nvme_rdma_free_io_queues(ctrl);
 948 }
 949
 950 static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new)
 951 {
 952         int ret;
 953
 954         ret = nvme_rdma_alloc_io_queues(ctrl);
 955         if (ret)
 956                 return ret;
 957
 958         if (new) {
 959                 ctrl->ctrl.tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, false);
 960                 if (IS_ERR(ctrl->ctrl.tagset)) {
 961                         ret = PTR_ERR(ctrl->ctrl.tagset);
 962                         goto out_free_io_queues;
 963                 }
 964
 965                 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
 966                 if (IS_ERR(ctrl->ctrl.connect_q)) {
 967                         ret = PTR_ERR(ctrl->ctrl.connect_q);
 968                         goto out_free_tag_set;
 969                 }
 970         }
 971
 972         ret = nvme_rdma_start_io_queues(ctrl);
 973         if (ret)
 974                 goto out_cleanup_connect_q;
 975
 976         if (!new) {
 977                 nvme_start_queues(&ctrl->ctrl);
 978                 nvme_wait_freeze(&ctrl->ctrl);
 979                 blk_mq_update_nr_hw_queues(ctrl->ctrl.tagset,
 980                         ctrl->ctrl.queue_count - 1);
 981                 nvme_unfreeze(&ctrl->ctrl);
 982         }
 983
 984         return 0;
 985
 986 out_cleanup_connect_q:
 987         if (new)
 988                 blk_cleanup_queue(ctrl->ctrl.connect_q);
 989 out_free_tag_set:
 990         if (new)
 991                 blk_mq_free_tag_set(ctrl->ctrl.tagset);
 992 out_free_io_queues:
 993         nvme_rdma_free_io_queues(ctrl);
 994         return ret;
 995 }
 996
 997 static void nvme_rdma_teardown_admin_queue(struct nvme_rdma_ctrl *ctrl,
 998                 bool remove)
 999 {
1000         blk_mq_quiesce_queue(ctrl->ctrl.admin_q);
1001         nvme_rdma_stop_queue(&ctrl->queues[0]);
1002         if (ctrl->ctrl.admin_tagset) {
1003                 blk_mq_tagset_busy_iter(ctrl->ctrl.admin_tagset,
1004                         nvme_cancel_request, &ctrl->ctrl);
1005                 blk_mq_tagset_wait_completed_request(ctrl->ctrl.admin_tagset);
1006         }
1007         if (remove)
1008                 blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
1009         nvme_rdma_destroy_admin_queue(ctrl, remove);
1010 }
1011
1012 static void nvme_rdma_teardown_io_queues(struct nvme_rdma_ctrl *ctrl,
1013                 bool remove)
1014 {
1015         if (ctrl->ctrl.queue_count > 1) {
1016                 nvme_start_freeze(&ctrl->ctrl);
1017                 nvme_stop_queues(&ctrl->ctrl);
1018                 nvme_rdma_stop_io_queues(ctrl);
1019                 if (ctrl->ctrl.tagset) {
1020                         blk_mq_tagset_busy_iter(ctrl->ctrl.tagset,
1021                                 nvme_cancel_request, &ctrl->ctrl);
1022                         blk_mq_tagset_wait_completed_request(ctrl->ctrl.tagset);
1023                 }
1024                 if (remove)
1025                         nvme_start_queues(&ctrl->ctrl);
1026                 nvme_rdma_destroy_io_queues(ctrl, remove);
1027         }
1028 }
1029
1030 static void nvme_rdma_free_ctrl(struct nvme_ctrl *nctrl)
1031 {
1032         struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
1033
1034         if (list_empty(&ctrl->list))
1035                 goto free_ctrl;
1036
1037         mutex_lock(&nvme_rdma_ctrl_mutex);
1038         list_del(&ctrl->list);
1039         mutex_unlock(&nvme_rdma_ctrl_mutex);
1040
1041         nvmf_free_options(nctrl->opts);
1042 free_ctrl:
1043         kfree(ctrl->queues);
1044         kfree(ctrl);
1045 }
1046
1047 static void nvme_rdma_reconnect_or_remove(struct nvme_rdma_ctrl *ctrl)
1048 {
1049         /* If we are resetting/deleting then do nothing */
1050         if (ctrl->ctrl.state != NVME_CTRL_CONNECTING) {
1051                 WARN_ON_ONCE(ctrl->ctrl.state == NVME_CTRL_NEW ||
1052                         ctrl->ctrl.state == NVME_CTRL_LIVE);
1053                 return;
1054         }
1055
1056         if (nvmf_should_reconnect(&ctrl->ctrl)) {
1057                 dev_info(ctrl->ctrl.device, "Reconnecting in %d seconds...\n",
1058                         ctrl->ctrl.opts->reconnect_delay);
1059                 queue_delayed_work(nvme_wq, &ctrl->reconnect_work,
1060                                 ctrl->ctrl.opts->reconnect_delay * HZ);
1061         } else {
1062                 nvme_delete_ctrl(&ctrl->ctrl);
1063         }
1064 }
1065
1066 static int nvme_rdma_setup_ctrl(struct nvme_rdma_ctrl *ctrl, bool new)
1067 {
1068         int ret = -EINVAL;
1069         bool changed;
1070
1071         ret = nvme_rdma_configure_admin_queue(ctrl, new);
1072         if (ret)
1073                 return ret;
1074
1075         if (ctrl->ctrl.icdoff) {
1076                 dev_err(ctrl->ctrl.device, "icdoff is not supported!\n");
1077                 goto destroy_admin;
1078         }
1079
1080         if (!(ctrl->ctrl.sgls & (1 << 2))) {
1081                 dev_err(ctrl->ctrl.device,
1082                         "Mandatory keyed sgls are not supported!\n");
1083                 goto destroy_admin;
1084         }
1085
1086         if (ctrl->ctrl.opts->queue_size > ctrl->ctrl.sqsize + 1) {
1087                 dev_warn(ctrl->ctrl.device,
1088                         "queue_size %zu > ctrl sqsize %u, clamping down\n",
1089                         ctrl->ctrl.opts->queue_size, ctrl->ctrl.sqsize + 1);
1090         }
1091
1092         if (ctrl->ctrl.sqsize + 1 > ctrl->ctrl.maxcmd) {
1093                 dev_warn(ctrl->ctrl.device,
1094                         "sqsize %u > ctrl maxcmd %u, clamping down\n",
1095                         ctrl->ctrl.sqsize + 1, ctrl->ctrl.maxcmd);
1096                 ctrl->ctrl.sqsize = ctrl->ctrl.maxcmd - 1;
1097         }
1098
1099         if (ctrl->ctrl.sgls & (1 << 20))
1100                 ctrl->use_inline_data = true;
1101
1102         if (ctrl->ctrl.queue_count > 1) {
1103                 ret = nvme_rdma_configure_io_queues(ctrl, new);
1104                 if (ret)
1105                         goto destroy_admin;
1106         }
1107
1108         changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
1109         if (!changed) {
1110                 /*
1111                  * state change failure is ok if we started ctrl delete,
1112                  * unless we're during creation of a new controller to
1113                  * avoid races with teardown flow.
1114                  */
1115                 WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING &&
1116                              ctrl->ctrl.state != NVME_CTRL_DELETING_NOIO);
1117                 WARN_ON_ONCE(new);
1118                 ret = -EINVAL;
1119                 goto destroy_io;
1120         }
1121
1122         nvme_start_ctrl(&ctrl->ctrl);
1123         return 0;
1124
1125 destroy_io:
1126         if (ctrl->ctrl.queue_count > 1)
1127                 nvme_rdma_destroy_io_queues(ctrl, new);
1128 destroy_admin:
1129         nvme_rdma_stop_queue(&ctrl->queues[0]);
1130         nvme_rdma_destroy_admin_queue(ctrl, new);
1131         return ret;
1132 }
1133
1134 static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work)
1135 {
1136         struct nvme_rdma_ctrl *ctrl = container_of(to_delayed_work(work),
1137                         struct nvme_rdma_ctrl, reconnect_work);
1138
1139         ++ctrl->ctrl.nr_reconnects;
1140
1141         if (nvme_rdma_setup_ctrl(ctrl, false))
1142                 goto requeue;
1143
1144         dev_info(ctrl->ctrl.device, "Successfully reconnected (%d attempts)\n",
1145                         ctrl->ctrl.nr_reconnects);
1146
1147         ctrl->ctrl.nr_reconnects = 0;
1148
1149         return;
1150
1151 requeue:
1152         dev_info(ctrl->ctrl.device, "Failed reconnect attempt %d\n",
1153                         ctrl->ctrl.nr_reconnects);
1154         nvme_rdma_reconnect_or_remove(ctrl);
1155 }
1156
1157 static void nvme_rdma_error_recovery_work(struct work_struct *work)
1158 {
1159         struct nvme_rdma_ctrl *ctrl = container_of(work,
1160                         struct nvme_rdma_ctrl, err_work);
1161
1162         nvme_stop_keep_alive(&ctrl->ctrl);
1163         nvme_rdma_teardown_io_queues(ctrl, false);
1164         nvme_start_queues(&ctrl->ctrl);
1165         nvme_rdma_teardown_admin_queue(ctrl, false);
1166         blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
1167
1168         if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
1169                 /* state change failure is ok if we started ctrl delete */
1170                 WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING &&
1171                              ctrl->ctrl.state != NVME_CTRL_DELETING_NOIO);
1172                 return;
1173         }
1174
1175         nvme_rdma_reconnect_or_remove(ctrl);
1176 }
1177
1178 static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl *ctrl)
1179 {
1180         if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING))
1181                 return;
1182
1183         queue_work(nvme_reset_wq, &ctrl->err_work);
1184 }
1185
1186 static void nvme_rdma_end_request(struct nvme_rdma_request *req)
1187 {
1188         struct request *rq = blk_mq_rq_from_pdu(req);
1189
1190         if (!refcount_dec_and_test(&req->ref))
1191                 return;
1192         if (!nvme_end_request(rq, req->status, req->result))
1193                 nvme_rdma_complete_rq(rq);
1194 }
1195
1196 static void nvme_rdma_wr_error(struct ib_cq *cq, struct ib_wc *wc,
1197                 const char *op)
1198 {
1199         struct nvme_rdma_queue *queue = wc->qp->qp_context;
1200         struct nvme_rdma_ctrl *ctrl = queue->ctrl;
1201
1202         if (ctrl->ctrl.state == NVME_CTRL_LIVE)
1203                 dev_info(ctrl->ctrl.device,
1204                              "%s for CQE 0x%p failed with status %s (%d)\n",
1205                              op, wc->wr_cqe,
1206                              ib_wc_status_msg(wc->status), wc->status);
1207         nvme_rdma_error_recovery(ctrl);
1208 }
1209
1210 static void nvme_rdma_memreg_done(struct ib_cq *cq, struct ib_wc *wc)
1211 {
1212         if (unlikely(wc->status != IB_WC_SUCCESS))
1213                 nvme_rdma_wr_error(cq, wc, "MEMREG");
1214 }
1215
1216 static void nvme_rdma_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc)
1217 {
1218         struct nvme_rdma_request *req =
1219                 container_of(wc->wr_cqe, struct nvme_rdma_request, reg_cqe);
1220
1221         if (unlikely(wc->status != IB_WC_SUCCESS))
1222                 nvme_rdma_wr_error(cq, wc, "LOCAL_INV");
1223         else
1224                 nvme_rdma_end_request(req);
1225 }
1226
1227 static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue,
1228                 struct nvme_rdma_request *req)
1229 {
1230         struct ib_send_wr wr = {
1231                 .opcode             = IB_WR_LOCAL_INV,
1232                 .next               = NULL,
1233                 .num_sge            = 0,
1234                 .send_flags         = IB_SEND_SIGNALED,
1235                 .ex.invalidate_rkey = req->mr->rkey,
1236         };
1237
1238         req->reg_cqe.done = nvme_rdma_inv_rkey_done;
1239         wr.wr_cqe = &req->reg_cqe;
1240
1241         return ib_post_send(queue->qp, &wr, NULL);
1242 }
1243
1244 static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue,
1245                 struct request *rq)
1246 {
1247         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1248         struct nvme_rdma_device *dev = queue->device;
1249         struct ib_device *ibdev = dev->dev;
1250         struct list_head *pool = &queue->qp->rdma_mrs;
1251
1252         if (!blk_rq_nr_phys_segments(rq))
1253                 return;
1254
1255         if (blk_integrity_rq(rq)) {
1256                 ib_dma_unmap_sg(ibdev, req->metadata_sgl->sg_table.sgl,
1257                                 req->metadata_sgl->nents, rq_dma_dir(rq));
1258                 sg_free_table_chained(&req->metadata_sgl->sg_table,
1259                                       NVME_INLINE_METADATA_SG_CNT);
1260         }
1261
1262         if (req->use_sig_mr)
1263                 pool = &queue->qp->sig_mrs;
1264
1265         if (req->mr) {
1266                 ib_mr_pool_put(queue->qp, pool, req->mr);
1267                 req->mr = NULL;
1268         }
1269
1270         ib_dma_unmap_sg(ibdev, req->data_sgl.sg_table.sgl, req->data_sgl.nents,
1271                         rq_dma_dir(rq));
1272         sg_free_table_chained(&req->data_sgl.sg_table, NVME_INLINE_SG_CNT);
1273 }
1274
1275 static int nvme_rdma_set_sg_null(struct nvme_command *c)
1276 {
1277         struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
1278
1279         sg->addr = 0;
1280         put_unaligned_le24(0, sg->length);
1281         put_unaligned_le32(0, sg->key);
1282         sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
1283         return 0;
1284 }
1285
1286 static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue *queue,
1287                 struct nvme_rdma_request *req, struct nvme_command *c,
1288                 int count)
1289 {
1290         struct nvme_sgl_desc *sg = &c->common.dptr.sgl;
1291         struct scatterlist *sgl = req->data_sgl.sg_table.sgl;
1292         struct ib_sge *sge = &req->sge[1];
1293         u32 len = 0;
1294         int i;
1295
1296         for (i = 0; i < count; i++, sgl++, sge++) {
1297                 sge->addr = sg_dma_address(sgl);
1298                 sge->length = sg_dma_len(sgl);
1299                 sge->lkey = queue->device->pd->local_dma_lkey;
1300                 len += sge->length;
1301         }
1302
1303         sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff);
1304         sg->length = cpu_to_le32(len);
1305         sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET;
1306
1307         req->num_sge += count;
1308         return 0;
1309 }
1310
1311 static int nvme_rdma_map_sg_single(struct nvme_rdma_queue *queue,
1312                 struct nvme_rdma_request *req, struct nvme_command *c)
1313 {
1314         struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
1315
1316         sg->addr = cpu_to_le64(sg_dma_address(req->data_sgl.sg_table.sgl));
1317         put_unaligned_le24(sg_dma_len(req->data_sgl.sg_table.sgl), sg->length);
1318         put_unaligned_le32(queue->device->pd->unsafe_global_rkey, sg->key);
1319         sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
1320         return 0;
1321 }
1322
1323 static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue *queue,
1324                 struct nvme_rdma_request *req, struct nvme_command *c,
1325                 int count)
1326 {
1327         struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
1328         int nr;
1329
1330         req->mr = ib_mr_pool_get(queue->qp, &queue->qp->rdma_mrs);
1331         if (WARN_ON_ONCE(!req->mr))
1332                 return -EAGAIN;
1333
1334         /*
1335          * Align the MR to a 4K page size to match the ctrl page size and
1336          * the block virtual boundary.
1337          */
1338         nr = ib_map_mr_sg(req->mr, req->data_sgl.sg_table.sgl, count, NULL,
1339                           SZ_4K);
1340         if (unlikely(nr < count)) {
1341                 ib_mr_pool_put(queue->qp, &queue->qp->rdma_mrs, req->mr);
1342                 req->mr = NULL;
1343                 if (nr < 0)
1344                         return nr;
1345                 return -EINVAL;
1346         }
1347
1348         ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey));
1349
1350         req->reg_cqe.done = nvme_rdma_memreg_done;
1351         memset(&req->reg_wr, 0, sizeof(req->reg_wr));
1352         req->reg_wr.wr.opcode = IB_WR_REG_MR;
1353         req->reg_wr.wr.wr_cqe = &req->reg_cqe;
1354         req->reg_wr.wr.num_sge = 0;
1355         req->reg_wr.mr = req->mr;
1356         req->reg_wr.key = req->mr->rkey;
1357         req->reg_wr.access = IB_ACCESS_LOCAL_WRITE |
1358                              IB_ACCESS_REMOTE_READ |
1359                              IB_ACCESS_REMOTE_WRITE;
1360
1361         sg->addr = cpu_to_le64(req->mr->iova);
1362         put_unaligned_le24(req->mr->length, sg->length);
1363         put_unaligned_le32(req->mr->rkey, sg->key);
1364         sg->type = (NVME_KEY_SGL_FMT_DATA_DESC << 4) |
1365                         NVME_SGL_FMT_INVALIDATE;
1366
1367         return 0;
1368 }
1369
1370 static void nvme_rdma_set_sig_domain(struct blk_integrity *bi,
1371                 struct nvme_command *cmd, struct ib_sig_domain *domain,
1372                 u16 control, u8 pi_type)
1373 {
1374         domain->sig_type = IB_SIG_TYPE_T10_DIF;
1375         domain->sig.dif.bg_type = IB_T10DIF_CRC;
1376         domain->sig.dif.pi_interval = 1 << bi->interval_exp;
1377         domain->sig.dif.ref_tag = le32_to_cpu(cmd->rw.reftag);
1378         if (control & NVME_RW_PRINFO_PRCHK_REF)
1379                 domain->sig.dif.ref_remap = true;
1380
1381         domain->sig.dif.app_tag = le16_to_cpu(cmd->rw.apptag);
1382         domain->sig.dif.apptag_check_mask = le16_to_cpu(cmd->rw.appmask);
1383         domain->sig.dif.app_escape = true;
1384         if (pi_type == NVME_NS_DPS_PI_TYPE3)
1385                 domain->sig.dif.ref_escape = true;
1386 }
1387
1388 static void nvme_rdma_set_sig_attrs(struct blk_integrity *bi,
1389                 struct nvme_command *cmd, struct ib_sig_attrs *sig_attrs,
1390                 u8 pi_type)
1391 {
1392         u16 control = le16_to_cpu(cmd->rw.control);
1393
1394         memset(sig_attrs, 0, sizeof(*sig_attrs));
1395         if (control & NVME_RW_PRINFO_PRACT) {
1396                 /* for WRITE_INSERT/READ_STRIP no memory domain */
1397                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
1398                 nvme_rdma_set_sig_domain(bi, cmd, &sig_attrs->wire, control,
1399                                          pi_type);
1400                 /* Clear the PRACT bit since HCA will generate/verify the PI */
1401                 control &= ~NVME_RW_PRINFO_PRACT;
1402                 cmd->rw.control = cpu_to_le16(control);
1403         } else {
1404                 /* for WRITE_PASS/READ_PASS both wire/memory domains exist */
1405                 nvme_rdma_set_sig_domain(bi, cmd, &sig_attrs->wire, control,
1406                                          pi_type);
1407                 nvme_rdma_set_sig_domain(bi, cmd, &sig_attrs->mem, control,
1408                                          pi_type);
1409         }
1410 }
1411
1412 static void nvme_rdma_set_prot_checks(struct nvme_command *cmd, u8 *mask)
1413 {
1414         *mask = 0;
1415         if (le16_to_cpu(cmd->rw.control) & NVME_RW_PRINFO_PRCHK_REF)
1416                 *mask |= IB_SIG_CHECK_REFTAG;
1417         if (le16_to_cpu(cmd->rw.control) & NVME_RW_PRINFO_PRCHK_GUARD)
1418                 *mask |= IB_SIG_CHECK_GUARD;
1419 }
1420
1421 static void nvme_rdma_sig_done(struct ib_cq *cq, struct ib_wc *wc)
1422 {
1423         if (unlikely(wc->status != IB_WC_SUCCESS))
1424                 nvme_rdma_wr_error(cq, wc, "SIG");
1425 }
1426
1427 static int nvme_rdma_map_sg_pi(struct nvme_rdma_queue *queue,
1428                 struct nvme_rdma_request *req, struct nvme_command *c,
1429                 int count, int pi_count)
1430 {
1431         struct nvme_rdma_sgl *sgl = &req->data_sgl;
1432         struct ib_reg_wr *wr = &req->reg_wr;
1433         struct request *rq = blk_mq_rq_from_pdu(req);
1434         struct nvme_ns *ns = rq->q->queuedata;
1435         struct bio *bio = rq->bio;
1436         struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
1437         int nr;
1438
1439         req->mr = ib_mr_pool_get(queue->qp, &queue->qp->sig_mrs);
1440         if (WARN_ON_ONCE(!req->mr))
1441                 return -EAGAIN;
1442
1443         nr = ib_map_mr_sg_pi(req->mr, sgl->sg_table.sgl, count, NULL,
1444                              req->metadata_sgl->sg_table.sgl, pi_count, NULL,
1445                              SZ_4K);
1446         if (unlikely(nr))
1447                 goto mr_put;
1448
1449         nvme_rdma_set_sig_attrs(blk_get_integrity(bio->bi_disk), c,
1450                                 req->mr->sig_attrs, ns->pi_type);
1451         nvme_rdma_set_prot_checks(c, &req->mr->sig_attrs->check_mask);
1452
1453         ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey));
1454
1455         req->reg_cqe.done = nvme_rdma_sig_done;
1456         memset(wr, 0, sizeof(*wr));
1457         wr->wr.opcode = IB_WR_REG_MR_INTEGRITY;
1458         wr->wr.wr_cqe = &req->reg_cqe;
1459         wr->wr.num_sge = 0;
1460         wr->wr.send_flags = 0;
1461         wr->mr = req->mr;
1462         wr->key = req->mr->rkey;
1463         wr->access = IB_ACCESS_LOCAL_WRITE |
1464                      IB_ACCESS_REMOTE_READ |
1465                      IB_ACCESS_REMOTE_WRITE;
1466
1467         sg->addr = cpu_to_le64(req->mr->iova);
1468         put_unaligned_le24(req->mr->length, sg->length);
1469         put_unaligned_le32(req->mr->rkey, sg->key);
1470         sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
1471
1472         return 0;
1473
1474 mr_put:
1475         ib_mr_pool_put(queue->qp, &queue->qp->sig_mrs, req->mr);
1476         req->mr = NULL;
1477         if (nr < 0)
1478                 return nr;
1479         return -EINVAL;
1480 }
1481
1482 static int nvme_rdma_map_data(struct nvme_rdma_queue *queue,
1483                 struct request *rq, struct nvme_command *c)
1484 {
1485         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1486         struct nvme_rdma_device *dev = queue->device;
1487         struct ib_device *ibdev = dev->dev;
1488         int pi_count = 0;
1489         int count, ret;
1490
1491         req->num_sge = 1;
1492         refcount_set(&req->ref, 2); /* send and recv completions */
1493
1494         c->common.flags |= NVME_CMD_SGL_METABUF;
1495
1496         if (!blk_rq_nr_phys_segments(rq))
1497                 return nvme_rdma_set_sg_null(c);
1498
1499         req->data_sgl.sg_table.sgl = (struct scatterlist *)(req + 1);
1500         ret = sg_alloc_table_chained(&req->data_sgl.sg_table,
1501                         blk_rq_nr_phys_segments(rq), req->data_sgl.sg_table.sgl,
1502                         NVME_INLINE_SG_CNT);
1503         if (ret)
1504                 return -ENOMEM;
1505
1506         req->data_sgl.nents = blk_rq_map_sg(rq->q, rq,
1507                                             req->data_sgl.sg_table.sgl);
1508
1509         count = ib_dma_map_sg(ibdev, req->data_sgl.sg_table.sgl,
1510                               req->data_sgl.nents, rq_dma_dir(rq));
1511         if (unlikely(count <= 0)) {
1512                 ret = -EIO;
1513                 goto out_free_table;
1514         }
1515
1516         if (blk_integrity_rq(rq)) {
1517                 req->metadata_sgl->sg_table.sgl =
1518                         (struct scatterlist *)(req->metadata_sgl + 1);
1519                 ret = sg_alloc_table_chained(&req->metadata_sgl->sg_table,
1520                                 blk_rq_count_integrity_sg(rq->q, rq->bio),
1521                                 req->metadata_sgl->sg_table.sgl,
1522                                 NVME_INLINE_METADATA_SG_CNT);
1523                 if (unlikely(ret)) {
1524                         ret = -ENOMEM;
1525                         goto out_unmap_sg;
1526                 }
1527
1528                 req->metadata_sgl->nents = blk_rq_map_integrity_sg(rq->q,
1529                                 rq->bio, req->metadata_sgl->sg_table.sgl);
1530                 pi_count = ib_dma_map_sg(ibdev,
1531                                          req->metadata_sgl->sg_table.sgl,
1532                                          req->metadata_sgl->nents,
1533                                          rq_dma_dir(rq));
1534                 if (unlikely(pi_count <= 0)) {
1535                         ret = -EIO;
1536                         goto out_free_pi_table;
1537                 }
1538         }
1539
1540         if (req->use_sig_mr) {
1541                 ret = nvme_rdma_map_sg_pi(queue, req, c, count, pi_count);
1542                 goto out;
1543         }
1544
1545         if (count <= dev->num_inline_segments) {
1546                 if (rq_data_dir(rq) == WRITE && nvme_rdma_queue_idx(queue) &&
1547                     queue->ctrl->use_inline_data &&
1548                     blk_rq_payload_bytes(rq) <=
1549                                 nvme_rdma_inline_data_size(queue)) {
1550                         ret = nvme_rdma_map_sg_inline(queue, req, c, count);
1551                         goto out;
1552                 }
1553
1554                 if (count == 1 && dev->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY) {
1555                         ret = nvme_rdma_map_sg_single(queue, req, c);
1556                         goto out;
1557                 }
1558         }
1559
1560         ret = nvme_rdma_map_sg_fr(queue, req, c, count);
1561 out:
1562         if (unlikely(ret))
1563                 goto out_unmap_pi_sg;
1564
1565         return 0;
1566
1567 out_unmap_pi_sg:
1568         if (blk_integrity_rq(rq))
1569                 ib_dma_unmap_sg(ibdev, req->metadata_sgl->sg_table.sgl,
1570                                 req->metadata_sgl->nents, rq_dma_dir(rq));
1571 out_free_pi_table:
1572         if (blk_integrity_rq(rq))
1573                 sg_free_table_chained(&req->metadata_sgl->sg_table,
1574                                       NVME_INLINE_METADATA_SG_CNT);
1575 out_unmap_sg:
1576         ib_dma_unmap_sg(ibdev, req->data_sgl.sg_table.sgl, req->data_sgl.nents,
1577                         rq_dma_dir(rq));
1578 out_free_table:
1579         sg_free_table_chained(&req->data_sgl.sg_table, NVME_INLINE_SG_CNT);
1580         return ret;
1581 }
1582
1583 static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
1584 {
1585         struct nvme_rdma_qe *qe =
1586                 container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
1587         struct nvme_rdma_request *req =
1588                 container_of(qe, struct nvme_rdma_request, sqe);
1589
1590         if (unlikely(wc->status != IB_WC_SUCCESS))
1591                 nvme_rdma_wr_error(cq, wc, "SEND");
1592         else
1593                 nvme_rdma_end_request(req);
1594 }
1595
1596 static int nvme_rdma_post_send(struct nvme_rdma_queue *queue,
1597                 struct nvme_rdma_qe *qe, struct ib_sge *sge, u32 num_sge,
1598                 struct ib_send_wr *first)
1599 {
1600         struct ib_send_wr wr;
1601         int ret;
1602
1603         sge->addr   = qe->dma;
1604         sge->length = sizeof(struct nvme_command);
1605         sge->lkey   = queue->device->pd->local_dma_lkey;
1606
1607         wr.next       = NULL;
1608         wr.wr_cqe     = &qe->cqe;
1609         wr.sg_list    = sge;
1610         wr.num_sge    = num_sge;
1611         wr.opcode     = IB_WR_SEND;
1612         wr.send_flags = IB_SEND_SIGNALED;
1613
1614         if (first)
1615                 first->next = &wr;
1616         else
1617                 first = &wr;
1618
1619         ret = ib_post_send(queue->qp, first, NULL);
1620         if (unlikely(ret)) {
1621                 dev_err(queue->ctrl->ctrl.device,
1622                              "%s failed with error code %d\n", __func__, ret);
1623         }
1624         return ret;
1625 }
1626
1627 static int nvme_rdma_post_recv(struct nvme_rdma_queue *queue,
1628                 struct nvme_rdma_qe *qe)
1629 {
1630         struct ib_recv_wr wr;
1631         struct ib_sge list;
1632         int ret;
1633
1634         list.addr   = qe->dma;
1635         list.length = sizeof(struct nvme_completion);
1636         list.lkey   = queue->device->pd->local_dma_lkey;
1637
1638         qe->cqe.done = nvme_rdma_recv_done;
1639
1640         wr.next     = NULL;
1641         wr.wr_cqe   = &qe->cqe;
1642         wr.sg_list  = &list;
1643         wr.num_sge  = 1;
1644
1645         ret = ib_post_recv(queue->qp, &wr, NULL);
1646         if (unlikely(ret)) {
1647                 dev_err(queue->ctrl->ctrl.device,
1648                         "%s failed with error code %d\n", __func__, ret);
1649         }
1650         return ret;
1651 }
1652
1653 static struct blk_mq_tags *nvme_rdma_tagset(struct nvme_rdma_queue *queue)
1654 {
1655         u32 queue_idx = nvme_rdma_queue_idx(queue);
1656
1657         if (queue_idx == 0)
1658                 return queue->ctrl->admin_tag_set.tags[queue_idx];
1659         return queue->ctrl->tag_set.tags[queue_idx - 1];
1660 }
1661
1662 static void nvme_rdma_async_done(struct ib_cq *cq, struct ib_wc *wc)
1663 {
1664         if (unlikely(wc->status != IB_WC_SUCCESS))
1665                 nvme_rdma_wr_error(cq, wc, "ASYNC");
1666 }
1667
1668 static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg)
1669 {
1670         struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(arg);
1671         struct nvme_rdma_queue *queue = &ctrl->queues[0];
1672         struct ib_device *dev = queue->device->dev;
1673         struct nvme_rdma_qe *sqe = &ctrl->async_event_sqe;
1674         struct nvme_command *cmd = sqe->data;
1675         struct ib_sge sge;
1676         int ret;
1677
1678         ib_dma_sync_single_for_cpu(dev, sqe->dma, sizeof(*cmd), DMA_TO_DEVICE);
1679
1680         memset(cmd, 0, sizeof(*cmd));
1681         cmd->common.opcode = nvme_admin_async_event;
1682         cmd->common.command_id = NVME_AQ_BLK_MQ_DEPTH;
1683         cmd->common.flags |= NVME_CMD_SGL_METABUF;
1684         nvme_rdma_set_sg_null(cmd);
1685
1686         sqe->cqe.done = nvme_rdma_async_done;
1687
1688         ib_dma_sync_single_for_device(dev, sqe->dma, sizeof(*cmd),
1689                         DMA_TO_DEVICE);
1690
1691         ret = nvme_rdma_post_send(queue, sqe, &sge, 1, NULL);
1692         WARN_ON_ONCE(ret);
1693 }
1694
1695 static void nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue,
1696                 struct nvme_completion *cqe, struct ib_wc *wc)
1697 {
1698         struct request *rq;
1699         struct nvme_rdma_request *req;
1700
1701         rq = blk_mq_tag_to_rq(nvme_rdma_tagset(queue), cqe->command_id);
1702         if (!rq) {
1703                 dev_err(queue->ctrl->ctrl.device,
1704                         "tag 0x%x on QP %#x not found\n",
1705                         cqe->command_id, queue->qp->qp_num);
1706                 nvme_rdma_error_recovery(queue->ctrl);
1707                 return;
1708         }
1709         req = blk_mq_rq_to_pdu(rq);
1710
1711         req->status = cqe->status;
1712         req->result = cqe->result;
1713
1714         if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
1715                 if (unlikely(wc->ex.invalidate_rkey != req->mr->rkey)) {
1716                         dev_err(queue->ctrl->ctrl.device,
1717                                 "Bogus remote invalidation for rkey %#x\n",
1718                                 req->mr->rkey);
1719                         nvme_rdma_error_recovery(queue->ctrl);
1720                 }
1721         } else if (req->mr) {
1722                 int ret;
1723
1724                 ret = nvme_rdma_inv_rkey(queue, req);
1725                 if (unlikely(ret < 0)) {
1726                         dev_err(queue->ctrl->ctrl.device,
1727                                 "Queueing INV WR for rkey %#x failed (%d)\n",
1728                                 req->mr->rkey, ret);
1729                         nvme_rdma_error_recovery(queue->ctrl);
1730                 }
1731                 /* the local invalidation completion will end the request */
1732                 return;
1733         }
1734
1735         nvme_rdma_end_request(req);
1736 }
1737
1738 static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1739 {
1740         struct nvme_rdma_qe *qe =
1741                 container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
1742         struct nvme_rdma_queue *queue = wc->qp->qp_context;
1743         struct ib_device *ibdev = queue->device->dev;
1744         struct nvme_completion *cqe = qe->data;
1745         const size_t len = sizeof(struct nvme_completion);
1746
1747         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1748                 nvme_rdma_wr_error(cq, wc, "RECV");
1749                 return;
1750         }
1751
1752         ib_dma_sync_single_for_cpu(ibdev, qe->dma, len, DMA_FROM_DEVICE);
1753         /*
1754          * AEN requests are special as they don't time out and can
1755          * survive any kind of queue freeze and often don't respond to
1756          * aborts.  We don't even bother to allocate a struct request
1757          * for them but rather special case them here.
1758          */
1759         if (unlikely(nvme_is_aen_req(nvme_rdma_queue_idx(queue),
1760                                      cqe->command_id)))
1761                 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
1762                                 &cqe->result);
1763         else
1764                 nvme_rdma_process_nvme_rsp(queue, cqe, wc);
1765         ib_dma_sync_single_for_device(ibdev, qe->dma, len, DMA_FROM_DEVICE);
1766
1767         nvme_rdma_post_recv(queue, qe);
1768 }
1769
1770 static int nvme_rdma_conn_established(struct nvme_rdma_queue *queue)
1771 {
1772         int ret, i;
1773
1774         for (i = 0; i < queue->queue_size; i++) {
1775                 ret = nvme_rdma_post_recv(queue, &queue->rsp_ring[i]);
1776                 if (ret)
1777                         goto out_destroy_queue_ib;
1778         }
1779
1780         return 0;
1781
1782 out_destroy_queue_ib:
1783         nvme_rdma_destroy_queue_ib(queue);
1784         return ret;
1785 }
1786
1787 static int nvme_rdma_conn_rejected(struct nvme_rdma_queue *queue,
1788                 struct rdma_cm_event *ev)
1789 {
1790         struct rdma_cm_id *cm_id = queue->cm_id;
1791         int status = ev->status;
1792         const char *rej_msg;
1793         const struct nvme_rdma_cm_rej *rej_data;
1794         u8 rej_data_len;
1795
1796         rej_msg = rdma_reject_msg(cm_id, status);
1797         rej_data = rdma_consumer_reject_data(cm_id, ev, &rej_data_len);
1798
1799         if (rej_data && rej_data_len >= sizeof(u16)) {
1800                 u16 sts = le16_to_cpu(rej_data->sts);
1801
1802                 dev_err(queue->ctrl->ctrl.device,
1803                       "Connect rejected: status %d (%s) nvme status %d (%s).\n",
1804                       status, rej_msg, sts, nvme_rdma_cm_msg(sts));
1805         } else {
1806                 dev_err(queue->ctrl->ctrl.device,
1807                         "Connect rejected: status %d (%s).\n", status, rej_msg);
1808         }
1809
1810         return -ECONNRESET;
1811 }
1812
1813 static int nvme_rdma_addr_resolved(struct nvme_rdma_queue *queue)
1814 {
1815         struct nvme_ctrl *ctrl = &queue->ctrl->ctrl;
1816         int ret;
1817
1818         ret = nvme_rdma_create_queue_ib(queue);
1819         if (ret)
1820                 return ret;
1821
1822         if (ctrl->opts->tos >= 0)
1823                 rdma_set_service_type(queue->cm_id, ctrl->opts->tos);
1824         ret = rdma_resolve_route(queue->cm_id, NVME_RDMA_CONNECT_TIMEOUT_MS);
1825         if (ret) {
1826                 dev_err(ctrl->device, "rdma_resolve_route failed (%d).\n",
1827                         queue->cm_error);
1828                 goto out_destroy_queue;
1829         }
1830
1831         return 0;
1832
1833 out_destroy_queue:
1834         nvme_rdma_destroy_queue_ib(queue);
1835         return ret;
1836 }
1837
1838 static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue)
1839 {
1840         struct nvme_rdma_ctrl *ctrl = queue->ctrl;
1841         struct rdma_conn_param param = { };
1842         struct nvme_rdma_cm_req priv = { };
1843         int ret;
1844
1845         param.qp_num = queue->qp->qp_num;
1846         param.flow_control = 1;
1847
1848         param.responder_resources = queue->device->dev->attrs.max_qp_rd_atom;
1849         /* maximum retry count */
1850         param.retry_count = 7;
1851         param.rnr_retry_count = 7;
1852         param.private_data = &priv;
1853         param.private_data_len = sizeof(priv);
1854
1855         priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1856         priv.qid = cpu_to_le16(nvme_rdma_queue_idx(queue));
1857         /*
1858          * set the admin queue depth to the minimum size
1859          * specified by the Fabrics standard.
1860          */
1861         if (priv.qid == 0) {
1862                 priv.hrqsize = cpu_to_le16(NVME_AQ_DEPTH);
1863                 priv.hsqsize = cpu_to_le16(NVME_AQ_DEPTH - 1);
1864         } else {
1865                 /*
1866                  * current interpretation of the fabrics spec
1867                  * is at minimum you make hrqsize sqsize+1, or a
1868                  * 1's based representation of sqsize.
1869                  */
1870                 priv.hrqsize = cpu_to_le16(queue->queue_size);
1871                 priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize);
1872         }
1873
1874         ret = rdma_connect(queue->cm_id, &param);
1875         if (ret) {
1876                 dev_err(ctrl->ctrl.device,
1877                         "rdma_connect failed (%d).\n", ret);
1878                 goto out_destroy_queue_ib;
1879         }
1880
1881         return 0;
1882
1883 out_destroy_queue_ib:
1884         nvme_rdma_destroy_queue_ib(queue);
1885         return ret;
1886 }
1887
1888 static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
1889                 struct rdma_cm_event *ev)
1890 {
1891         struct nvme_rdma_queue *queue = cm_id->context;
1892         int cm_error = 0;
1893
1894         dev_dbg(queue->ctrl->ctrl.device, "%s (%d): status %d id %p\n",
1895                 rdma_event_msg(ev->event), ev->event,
1896                 ev->status, cm_id);
1897
1898         switch (ev->event) {
1899         case RDMA_CM_EVENT_ADDR_RESOLVED:
1900                 cm_error = nvme_rdma_addr_resolved(queue);
1901                 break;
1902         case RDMA_CM_EVENT_ROUTE_RESOLVED:
1903                 cm_error = nvme_rdma_route_resolved(queue);
1904                 break;
1905         case RDMA_CM_EVENT_ESTABLISHED:
1906                 queue->cm_error = nvme_rdma_conn_established(queue);
1907                 /* complete cm_done regardless of success/failure */
1908                 complete(&queue->cm_done);
1909                 return 0;
1910         case RDMA_CM_EVENT_REJECTED:
1911                 nvme_rdma_destroy_queue_ib(queue);
1912                 cm_error = nvme_rdma_conn_rejected(queue, ev);
1913                 break;
1914         case RDMA_CM_EVENT_ROUTE_ERROR:
1915         case RDMA_CM_EVENT_CONNECT_ERROR:
1916         case RDMA_CM_EVENT_UNREACHABLE:
1917                 nvme_rdma_destroy_queue_ib(queue);
1918                 /* fall through */
1919         case RDMA_CM_EVENT_ADDR_ERROR:
1920                 dev_dbg(queue->ctrl->ctrl.device,
1921                         "CM error event %d\n", ev->event);
1922                 cm_error = -ECONNRESET;
1923                 break;
1924         case RDMA_CM_EVENT_DISCONNECTED:
1925         case RDMA_CM_EVENT_ADDR_CHANGE:
1926         case RDMA_CM_EVENT_TIMEWAIT_EXIT:
1927                 dev_dbg(queue->ctrl->ctrl.device,
1928                         "disconnect received - connection closed\n");
1929                 nvme_rdma_error_recovery(queue->ctrl);
1930                 break;
1931         case RDMA_CM_EVENT_DEVICE_REMOVAL:
1932                 /* device removal is handled via the ib_client API */
1933                 break;
1934         default:
1935                 dev_err(queue->ctrl->ctrl.device,
1936                         "Unexpected RDMA CM event (%d)\n", ev->event);
1937                 nvme_rdma_error_recovery(queue->ctrl);
1938                 break;
1939         }
1940
1941         if (cm_error) {
1942                 queue->cm_error = cm_error;
1943                 complete(&queue->cm_done);
1944         }
1945
1946         return 0;
1947 }
1948
1949 static enum blk_eh_timer_return
1950 nvme_rdma_timeout(struct request *rq, bool reserved)
1951 {
1952         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1953         struct nvme_rdma_queue *queue = req->queue;
1954         struct nvme_rdma_ctrl *ctrl = queue->ctrl;
1955
1956         dev_warn(ctrl->ctrl.device, "I/O %d QID %d timeout\n",
1957                  rq->tag, nvme_rdma_queue_idx(queue));
1958
1959         /*
1960          * Restart the timer if a controller reset is already scheduled. Any
1961          * timed out commands would be handled before entering the connecting
1962          * state.
1963          */
1964         if (ctrl->ctrl.state == NVME_CTRL_RESETTING)
1965                 return BLK_EH_RESET_TIMER;
1966
1967         if (ctrl->ctrl.state != NVME_CTRL_LIVE) {
1968                 /*
1969                  * Teardown immediately if controller times out while starting
1970                  * or we are already started error recovery. all outstanding
1971                  * requests are completed on shutdown, so we return BLK_EH_DONE.
1972                  */
1973                 flush_work(&ctrl->err_work);
1974                 nvme_rdma_teardown_io_queues(ctrl, false);
1975                 nvme_rdma_teardown_admin_queue(ctrl, false);
1976                 return BLK_EH_DONE;
1977         }
1978
1979         dev_warn(ctrl->ctrl.device, "starting error recovery\n");
1980         nvme_rdma_error_recovery(ctrl);
1981
1982         return BLK_EH_RESET_TIMER;
1983 }
1984
1985 static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
1986                 const struct blk_mq_queue_data *bd)
1987 {
1988         struct nvme_ns *ns = hctx->queue->queuedata;
1989         struct nvme_rdma_queue *queue = hctx->driver_data;
1990         struct request *rq = bd->rq;
1991         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1992         struct nvme_rdma_qe *sqe = &req->sqe;
1993         struct nvme_command *c = sqe->data;
1994         struct ib_device *dev;
1995         bool queue_ready = test_bit(NVME_RDMA_Q_LIVE, &queue->flags);
1996         blk_status_t ret;
1997         int err;
1998
1999         WARN_ON_ONCE(rq->tag < 0);
2000
2001         if (!nvmf_check_ready(&queue->ctrl->ctrl, rq, queue_ready))
2002                 return nvmf_fail_nonready_command(&queue->ctrl->ctrl, rq);
2003
2004         dev = queue->device->dev;
2005
2006         req->sqe.dma = ib_dma_map_single(dev, req->sqe.data,
2007                                          sizeof(struct nvme_command),
2008                                          DMA_TO_DEVICE);
2009         err = ib_dma_mapping_error(dev, req->sqe.dma);
2010         if (unlikely(err))
2011                 return BLK_STS_RESOURCE;
2012
2013         ib_dma_sync_single_for_cpu(dev, sqe->dma,
2014                         sizeof(struct nvme_command), DMA_TO_DEVICE);
2015
2016         ret = nvme_setup_cmd(ns, rq, c);
2017         if (ret)
2018                 goto unmap_qe;
2019
2020         blk_mq_start_request(rq);
2021
2022         if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) &&
2023             queue->pi_support &&
2024             (c->common.opcode == nvme_cmd_write ||
2025              c->common.opcode == nvme_cmd_read) &&
2026             nvme_ns_has_pi(ns))
2027                 req->use_sig_mr = true;
2028         else
2029                 req->use_sig_mr = false;
2030
2031         err = nvme_rdma_map_data(queue, rq, c);
2032         if (unlikely(err < 0)) {
2033                 dev_err(queue->ctrl->ctrl.device,
2034                              "Failed to map data (%d)\n", err);
2035                 goto err;
2036         }
2037
2038         sqe->cqe.done = nvme_rdma_send_done;
2039
2040         ib_dma_sync_single_for_device(dev, sqe->dma,
2041                         sizeof(struct nvme_command), DMA_TO_DEVICE);
2042
2043         err = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge,
2044                         req->mr ? &req->reg_wr.wr : NULL);
2045         if (unlikely(err))
2046                 goto err_unmap;
2047
2048         return BLK_STS_OK;
2049
2050 err_unmap:
2051         nvme_rdma_unmap_data(queue, rq);
2052 err:
2053         if (err == -ENOMEM || err == -EAGAIN)
2054                 ret = BLK_STS_RESOURCE;
2055         else
2056                 ret = BLK_STS_IOERR;
2057         nvme_cleanup_cmd(rq);
2058 unmap_qe:
2059         ib_dma_unmap_single(dev, req->sqe.dma, sizeof(struct nvme_command),
2060                             DMA_TO_DEVICE);
2061         return ret;
2062 }
2063
2064 static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx)
2065 {
2066         struct nvme_rdma_queue *queue = hctx->driver_data;
2067
2068         return ib_process_cq_direct(queue->ib_cq, -1);
2069 }
2070
2071 static void nvme_rdma_check_pi_status(struct nvme_rdma_request *req)
2072 {
2073         struct request *rq = blk_mq_rq_from_pdu(req);
2074         struct ib_mr_status mr_status;
2075         int ret;
2076
2077         ret = ib_check_mr_status(req->mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
2078         if (ret) {
2079                 pr_err("ib_check_mr_status failed, ret %d\n", ret);
2080                 nvme_req(rq)->status = NVME_SC_INVALID_PI;
2081                 return;
2082         }
2083
2084         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
2085                 switch (mr_status.sig_err.err_type) {
2086                 case IB_SIG_BAD_GUARD:
2087                         nvme_req(rq)->status = NVME_SC_GUARD_CHECK;
2088                         break;
2089                 case IB_SIG_BAD_REFTAG:
2090                         nvme_req(rq)->status = NVME_SC_REFTAG_CHECK;
2091                         break;
2092                 case IB_SIG_BAD_APPTAG:
2093                         nvme_req(rq)->status = NVME_SC_APPTAG_CHECK;
2094                         break;
2095                 }
2096                 pr_err("PI error found type %d expected 0x%x vs actual 0x%x\n",
2097                        mr_status.sig_err.err_type, mr_status.sig_err.expected,
2098                        mr_status.sig_err.actual);
2099         }
2100 }
2101
2102 static void nvme_rdma_complete_rq(struct request *rq)
2103 {
2104         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
2105         struct nvme_rdma_queue *queue = req->queue;
2106         struct ib_device *ibdev = queue->device->dev;
2107
2108         if (req->use_sig_mr)
2109                 nvme_rdma_check_pi_status(req);
2110
2111         nvme_rdma_unmap_data(queue, rq);
2112         ib_dma_unmap_single(ibdev, req->sqe.dma, sizeof(struct nvme_command),
2113                             DMA_TO_DEVICE);
2114         nvme_complete_rq(rq);
2115 }
2116
2117 static int nvme_rdma_map_queues(struct blk_mq_tag_set *set)
2118 {
2119         struct nvme_rdma_ctrl *ctrl = set->driver_data;
2120         struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
2121
2122         if (opts->nr_write_queues && ctrl->io_queues[HCTX_TYPE_READ]) {
2123                 /* separate read/write queues */
2124                 set->map[HCTX_TYPE_DEFAULT].nr_queues =
2125                         ctrl->io_queues[HCTX_TYPE_DEFAULT];
2126                 set->map[HCTX_TYPE_DEFAULT].queue_offset = 0;
2127                 set->map[HCTX_TYPE_READ].nr_queues =
2128                         ctrl->io_queues[HCTX_TYPE_READ];
2129                 set->map[HCTX_TYPE_READ].queue_offset =
2130                         ctrl->io_queues[HCTX_TYPE_DEFAULT];
2131         } else {
2132                 /* shared read/write queues */
2133                 set->map[HCTX_TYPE_DEFAULT].nr_queues =
2134                         ctrl->io_queues[HCTX_TYPE_DEFAULT];
2135                 set->map[HCTX_TYPE_DEFAULT].queue_offset = 0;
2136                 set->map[HCTX_TYPE_READ].nr_queues =
2137                         ctrl->io_queues[HCTX_TYPE_DEFAULT];
2138                 set->map[HCTX_TYPE_READ].queue_offset = 0;
2139         }
2140         blk_mq_rdma_map_queues(&set->map[HCTX_TYPE_DEFAULT],
2141                         ctrl->device->dev, 0);
2142         blk_mq_rdma_map_queues(&set->map[HCTX_TYPE_READ],
2143                         ctrl->device->dev, 0);
2144
2145         if (opts->nr_poll_queues && ctrl->io_queues[HCTX_TYPE_POLL]) {
2146                 /* map dedicated poll queues only if we have queues left */
2147                 set->map[HCTX_TYPE_POLL].nr_queues =
2148                                 ctrl->io_queues[HCTX_TYPE_POLL];
2149                 set->map[HCTX_TYPE_POLL].queue_offset =
2150                         ctrl->io_queues[HCTX_TYPE_DEFAULT] +
2151                         ctrl->io_queues[HCTX_TYPE_READ];
2152                 blk_mq_map_queues(&set->map[HCTX_TYPE_POLL]);
2153         }
2154
2155         dev_info(ctrl->ctrl.device,
2156                 "mapped %d/%d/%d default/read/poll queues.\n",
2157                 ctrl->io_queues[HCTX_TYPE_DEFAULT],
2158                 ctrl->io_queues[HCTX_TYPE_READ],
2159                 ctrl->io_queues[HCTX_TYPE_POLL]);
2160
2161         return 0;
2162 }
2163
2164 static const struct blk_mq_ops nvme_rdma_mq_ops = {
2165         .queue_rq       = nvme_rdma_queue_rq,
2166         .complete       = nvme_rdma_complete_rq,
2167         .init_request   = nvme_rdma_init_request,
2168         .exit_request   = nvme_rdma_exit_request,
2169         .init_hctx      = nvme_rdma_init_hctx,
2170         .timeout        = nvme_rdma_timeout,
2171         .map_queues     = nvme_rdma_map_queues,
2172         .poll           = nvme_rdma_poll,
2173 };
2174
2175 static const struct blk_mq_ops nvme_rdma_admin_mq_ops = {
2176         .queue_rq       = nvme_rdma_queue_rq,
2177         .complete       = nvme_rdma_complete_rq,
2178         .init_request   = nvme_rdma_init_request,
2179         .exit_request   = nvme_rdma_exit_request,
2180         .init_hctx      = nvme_rdma_init_admin_hctx,
2181         .timeout        = nvme_rdma_timeout,
2182 };
2183
2184 static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
2185 {
2186         cancel_work_sync(&ctrl->err_work);
2187         cancel_delayed_work_sync(&ctrl->reconnect_work);
2188
2189         nvme_rdma_teardown_io_queues(ctrl, shutdown);
2190         blk_mq_quiesce_queue(ctrl->ctrl.admin_q);
2191         if (shutdown)
2192                 nvme_shutdown_ctrl(&ctrl->ctrl);
2193         else
2194                 nvme_disable_ctrl(&ctrl->ctrl);
2195         nvme_rdma_teardown_admin_queue(ctrl, shutdown);
2196 }
2197
2198 static void nvme_rdma_delete_ctrl(struct nvme_ctrl *ctrl)
2199 {
2200         nvme_rdma_shutdown_ctrl(to_rdma_ctrl(ctrl), true);
2201 }
2202
2203 static void nvme_rdma_reset_ctrl_work(struct work_struct *work)
2204 {
2205         struct nvme_rdma_ctrl *ctrl =
2206                 container_of(work, struct nvme_rdma_ctrl, ctrl.reset_work);
2207
2208         nvme_stop_ctrl(&ctrl->ctrl);
2209         nvme_rdma_shutdown_ctrl(ctrl, false);
2210
2211         if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
2212                 /* state change failure should never happen */
2213                 WARN_ON_ONCE(1);
2214                 return;
2215         }
2216
2217         if (nvme_rdma_setup_ctrl(ctrl, false))
2218                 goto out_fail;
2219
2220         return;
2221
2222 out_fail:
2223         ++ctrl->ctrl.nr_reconnects;
2224         nvme_rdma_reconnect_or_remove(ctrl);
2225 }
2226
2227 static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {
2228         .name                   = "rdma",
2229         .module                 = THIS_MODULE,
2230         .flags                  = NVME_F_FABRICS | NVME_F_METADATA_SUPPORTED,
2231         .reg_read32             = nvmf_reg_read32,
2232         .reg_read64             = nvmf_reg_read64,
2233         .reg_write32            = nvmf_reg_write32,
2234         .free_ctrl              = nvme_rdma_free_ctrl,
2235         .submit_async_event     = nvme_rdma_submit_async_event,
2236         .delete_ctrl            = nvme_rdma_delete_ctrl,
2237         .get_address            = nvmf_get_address,
2238 };
2239
2240 /*
2241  * Fails a connection request if it matches an existing controller
2242  * (association) with the same tuple:
2243  * <Host NQN, Host ID, local address, remote address, remote port, SUBSYS NQN>
2244  *
2245  * if local address is not specified in the request, it will match an
2246  * existing controller with all the other parameters the same and no
2247  * local port address specified as well.
2248  *
2249  * The ports don't need to be compared as they are intrinsically
2250  * already matched by the port pointers supplied.
2251  */
2252 static bool
2253 nvme_rdma_existing_controller(struct nvmf_ctrl_options *opts)
2254 {
2255         struct nvme_rdma_ctrl *ctrl;
2256         bool found = false;
2257
2258         mutex_lock(&nvme_rdma_ctrl_mutex);
2259         list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
2260                 found = nvmf_ip_options_match(&ctrl->ctrl, opts);
2261                 if (found)
2262                         break;
2263         }
2264         mutex_unlock(&nvme_rdma_ctrl_mutex);
2265
2266         return found;
2267 }
2268
2269 static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
2270                 struct nvmf_ctrl_options *opts)
2271 {
2272         struct nvme_rdma_ctrl *ctrl;
2273         int ret;
2274         bool changed;
2275
2276         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
2277         if (!ctrl)
2278                 return ERR_PTR(-ENOMEM);
2279         ctrl->ctrl.opts = opts;
2280         INIT_LIST_HEAD(&ctrl->list);
2281
2282         if (!(opts->mask & NVMF_OPT_TRSVCID)) {
2283                 opts->trsvcid =
2284                         kstrdup(__stringify(NVME_RDMA_IP_PORT), GFP_KERNEL);
2285                 if (!opts->trsvcid) {
2286                         ret = -ENOMEM;
2287                         goto out_free_ctrl;
2288                 }
2289                 opts->mask |= NVMF_OPT_TRSVCID;
2290         }
2291
2292         ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
2293                         opts->traddr, opts->trsvcid, &ctrl->addr);
2294         if (ret) {
2295                 pr_err("malformed address passed: %s:%s\n",
2296                         opts->traddr, opts->trsvcid);
2297                 goto out_free_ctrl;
2298         }
2299
2300         if (opts->mask & NVMF_OPT_HOST_TRADDR) {
2301                 ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
2302                         opts->host_traddr, NULL, &ctrl->src_addr);
2303                 if (ret) {
2304                         pr_err("malformed src address passed: %s\n",
2305                                opts->host_traddr);
2306                         goto out_free_ctrl;
2307                 }
2308         }
2309
2310         if (!opts->duplicate_connect && nvme_rdma_existing_controller(opts)) {
2311                 ret = -EALREADY;
2312                 goto out_free_ctrl;
2313         }
2314
2315         INIT_DELAYED_WORK(&ctrl->reconnect_work,
2316                         nvme_rdma_reconnect_ctrl_work);
2317         INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work);
2318         INIT_WORK(&ctrl->ctrl.reset_work, nvme_rdma_reset_ctrl_work);
2319
2320         ctrl->ctrl.queue_count = opts->nr_io_queues + opts->nr_write_queues +
2321                                 opts->nr_poll_queues + 1;
2322         ctrl->ctrl.sqsize = opts->queue_size - 1;
2323         ctrl->ctrl.kato = opts->kato;
2324
2325         ret = -ENOMEM;
2326         ctrl->queues = kcalloc(ctrl->ctrl.queue_count, sizeof(*ctrl->queues),
2327                                 GFP_KERNEL);
2328         if (!ctrl->queues)
2329                 goto out_free_ctrl;
2330
2331         ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops,
2332                                 0 /* no quirks, we're perfect! */);
2333         if (ret)
2334                 goto out_kfree_queues;
2335
2336         changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING);
2337         WARN_ON_ONCE(!changed);
2338
2339         ret = nvme_rdma_setup_ctrl(ctrl, true);
2340         if (ret)
2341                 goto out_uninit_ctrl;
2342
2343         dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISpcs\n",
2344                 ctrl->ctrl.opts->subsysnqn, &ctrl->addr);
2345
2346         mutex_lock(&nvme_rdma_ctrl_mutex);
2347         list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list);
2348         mutex_unlock(&nvme_rdma_ctrl_mutex);
2349
2350         return &ctrl->ctrl;
2351
2352 out_uninit_ctrl:
2353         nvme_uninit_ctrl(&ctrl->ctrl);
2354         nvme_put_ctrl(&ctrl->ctrl);
2355         if (ret > 0)
2356                 ret = -EIO;
2357         return ERR_PTR(ret);
2358 out_kfree_queues:
2359         kfree(ctrl->queues);
2360 out_free_ctrl:
2361         kfree(ctrl);
2362         return ERR_PTR(ret);
2363 }
2364
2365 static struct nvmf_transport_ops nvme_rdma_transport = {
2366         .name           = "rdma",
2367         .module         = THIS_MODULE,
2368         .required_opts  = NVMF_OPT_TRADDR,
2369         .allowed_opts   = NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY |
2370                           NVMF_OPT_HOST_TRADDR | NVMF_OPT_CTRL_LOSS_TMO |
2371                           NVMF_OPT_NR_WRITE_QUEUES | NVMF_OPT_NR_POLL_QUEUES |
2372                           NVMF_OPT_TOS,
2373         .create_ctrl    = nvme_rdma_create_ctrl,
2374 };
2375
2376 static void nvme_rdma_remove_one(struct ib_device *ib_device, void *client_data)
2377 {
2378         struct nvme_rdma_ctrl *ctrl;
2379         struct nvme_rdma_device *ndev;
2380         bool found = false;
2381
2382         mutex_lock(&device_list_mutex);
2383         list_for_each_entry(ndev, &device_list, entry) {
2384                 if (ndev->dev == ib_device) {
2385                         found = true;
2386                         break;
2387                 }
2388         }
2389         mutex_unlock(&device_list_mutex);
2390
2391         if (!found)
2392                 return;
2393
2394         /* Delete all controllers using this device */
2395         mutex_lock(&nvme_rdma_ctrl_mutex);
2396         list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
2397                 if (ctrl->device->dev != ib_device)
2398                         continue;
2399                 nvme_delete_ctrl(&ctrl->ctrl);
2400         }
2401         mutex_unlock(&nvme_rdma_ctrl_mutex);
2402
2403         flush_workqueue(nvme_delete_wq);
2404 }
2405
2406 static struct ib_client nvme_rdma_ib_client = {
2407         .name   = "nvme_rdma",
2408         .remove = nvme_rdma_remove_one
2409 };
2410
2411 static int __init nvme_rdma_init_module(void)
2412 {
2413         int ret;
2414
2415         ret = ib_register_client(&nvme_rdma_ib_client);
2416         if (ret)
2417                 return ret;
2418
2419         ret = nvmf_register_transport(&nvme_rdma_transport);
2420         if (ret)
2421                 goto err_unreg_client;
2422
2423         return 0;
2424
2425 err_unreg_client:
2426         ib_unregister_client(&nvme_rdma_ib_client);
2427         return ret;
2428 }
2429
2430 static void __exit nvme_rdma_cleanup_module(void)
2431 {
2432         struct nvme_rdma_ctrl *ctrl;
2433
2434         nvmf_unregister_transport(&nvme_rdma_transport);
2435         ib_unregister_client(&nvme_rdma_ib_client);
2436
2437         mutex_lock(&nvme_rdma_ctrl_mutex);
2438         list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list)
2439                 nvme_delete_ctrl(&ctrl->ctrl);
2440         mutex_unlock(&nvme_rdma_ctrl_mutex);
2441         flush_workqueue(nvme_delete_wq);
2442 }
2443
2444 module_init(nvme_rdma_init_module);
2445 module_exit(nvme_rdma_cleanup_module);
2446
2447 MODULE_LICENSE("GPL v2");