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/blk-integrity.h>
  17 #include <linux/types.h>
  18 #include <linux/list.h>
  19 #include <linux/mutex.h>
  20 #include <linux/scatterlist.h>
  21 #include <linux/nvme.h>
  22 #include <asm/unaligned.h>
  23
  24 #include <rdma/ib_verbs.h>
  25 #include <rdma/rdma_cm.h>
  26 #include <linux/nvme-rdma.h>
  27
  28 #include "nvme.h"
  29 #include "fabrics.h"
  30
  31
  32 #define NVME_RDMA_CONNECT_TIMEOUT_MS    3000            /* 3 second */
  33
  34 #define NVME_RDMA_MAX_SEGMENTS          256
  35
  36 #define NVME_RDMA_MAX_INLINE_SEGMENTS   4
  37
  38 #define NVME_RDMA_DATA_SGL_SIZE \
  39         (sizeof(struct scatterlist) * NVME_INLINE_SG_CNT)
  40 #define NVME_RDMA_METADATA_SGL_SIZE \
  41         (sizeof(struct scatterlist) * NVME_INLINE_METADATA_SG_CNT)
  42
  43 struct nvme_rdma_device {
  44         struct ib_device        *dev;
  45         struct ib_pd            *pd;
  46         struct kref             ref;
  47         struct list_head        entry;
  48         unsigned int            num_inline_segments;
  49 };
  50
  51 struct nvme_rdma_qe {
  52         struct ib_cqe           cqe;
  53         void                    *data;
  54         u64                     dma;
  55 };
  56
  57 struct nvme_rdma_sgl {
  58         int                     nents;
  59         struct sg_table         sg_table;
  60 };
  61
  62 struct nvme_rdma_queue;
  63 struct nvme_rdma_request {
  64         struct nvme_request     req;
  65         struct ib_mr            *mr;
  66         struct nvme_rdma_qe     sqe;
  67         union nvme_result       result;
  68         __le16                  status;
  69         refcount_t              ref;
  70         struct ib_sge           sge[1 + NVME_RDMA_MAX_INLINE_SEGMENTS];
  71         u32                     num_sge;
  72         struct ib_reg_wr        reg_wr;
  73         struct ib_cqe           reg_cqe;
  74         struct nvme_rdma_queue  *queue;
  75         struct nvme_rdma_sgl    data_sgl;
  76         struct nvme_rdma_sgl    *metadata_sgl;
  77         bool                    use_sig_mr;
  78 };
  79
  80 enum nvme_rdma_queue_flags {
  81         NVME_RDMA_Q_ALLOCATED           = 0,
  82         NVME_RDMA_Q_LIVE                = 1,
  83         NVME_RDMA_Q_TR_READY            = 2,
  84 };
  85
  86 struct nvme_rdma_queue {
  87         struct nvme_rdma_qe     *rsp_ring;
  88         int                     queue_size;
  89         size_t                  cmnd_capsule_len;
  90         struct nvme_rdma_ctrl   *ctrl;
  91         struct nvme_rdma_device *device;
  92         struct ib_cq            *ib_cq;
  93         struct ib_qp            *qp;
  94
  95         unsigned long           flags;
  96         struct rdma_cm_id       *cm_id;
  97         int                     cm_error;
  98         struct completion       cm_done;
  99         bool                    pi_support;
 100         int                     cq_size;
 101         struct mutex            queue_lock;
 102 };
 103
 104 struct nvme_rdma_ctrl {
 105         /* read only in the hot path */
 106         struct nvme_rdma_queue  *queues;
 107
 108         /* other member variables */
 109         struct blk_mq_tag_set   tag_set;
 110         struct work_struct      err_work;
 111
 112         struct nvme_rdma_qe     async_event_sqe;
 113
 114         struct delayed_work     reconnect_work;
 115
 116         struct list_head        list;
 117
 118         struct blk_mq_tag_set   admin_tag_set;
 119         struct nvme_rdma_device *device;
 120
 121         u32                     max_fr_pages;
 122
 123         struct sockaddr_storage addr;
 124         struct sockaddr_storage src_addr;
 125
 126         struct nvme_ctrl        ctrl;
 127         bool                    use_inline_data;
 128         u32                     io_queues[HCTX_MAX_TYPES];
 129 };
 130
 131 static inline struct nvme_rdma_ctrl *to_rdma_ctrl(struct nvme_ctrl *ctrl)
 132 {
 133         return container_of(ctrl, struct nvme_rdma_ctrl, ctrl);
 134 }
 135
 136 static LIST_HEAD(device_list);
 137 static DEFINE_MUTEX(device_list_mutex);
 138
 139 static LIST_HEAD(nvme_rdma_ctrl_list);
 140 static DEFINE_MUTEX(nvme_rdma_ctrl_mutex);
 141
 142 /*
 143  * Disabling this option makes small I/O goes faster, but is fundamentally
 144  * unsafe.  With it turned off we will have to register a global rkey that
 145  * allows read and write access to all physical memory.
 146  */
 147 static bool register_always = true;
 148 module_param(register_always, bool, 0444);
 149 MODULE_PARM_DESC(register_always,
 150          "Use memory registration even for contiguous memory regions");
 151
 152 static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
 153                 struct rdma_cm_event *event);
 154 static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
 155 static void nvme_rdma_complete_rq(struct request *rq);
 156
 157 static const struct blk_mq_ops nvme_rdma_mq_ops;
 158 static const struct blk_mq_ops nvme_rdma_admin_mq_ops;
 159
 160 static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue *queue)
 161 {
 162         return queue - queue->ctrl->queues;
 163 }
 164
 165 static bool nvme_rdma_poll_queue(struct nvme_rdma_queue *queue)
 166 {
 167         return nvme_rdma_queue_idx(queue) >
 168                 queue->ctrl->io_queues[HCTX_TYPE_DEFAULT] +
 169                 queue->ctrl->io_queues[HCTX_TYPE_READ];
 170 }
 171
 172 static inline size_t nvme_rdma_inline_data_size(struct nvme_rdma_queue *queue)
 173 {
 174         return queue->cmnd_capsule_len - sizeof(struct nvme_command);
 175 }
 176
 177 static void nvme_rdma_free_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
 178                 size_t capsule_size, enum dma_data_direction dir)
 179 {
 180         ib_dma_unmap_single(ibdev, qe->dma, capsule_size, dir);
 181         kfree(qe->data);
 182 }
 183
 184 static int nvme_rdma_alloc_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
 185                 size_t capsule_size, enum dma_data_direction dir)
 186 {
 187         qe->data = kzalloc(capsule_size, GFP_KERNEL);
 188         if (!qe->data)
 189                 return -ENOMEM;
 190
 191         qe->dma = ib_dma_map_single(ibdev, qe->data, capsule_size, dir);
 192         if (ib_dma_mapping_error(ibdev, qe->dma)) {
 193                 kfree(qe->data);
 194                 qe->data = NULL;
 195                 return -ENOMEM;
 196         }
 197
 198         return 0;
 199 }
 200
 201 static void nvme_rdma_free_ring(struct ib_device *ibdev,
 202                 struct nvme_rdma_qe *ring, size_t ib_queue_size,
 203                 size_t capsule_size, enum dma_data_direction dir)
 204 {
 205         int i;
 206
 207         for (i = 0; i < ib_queue_size; i++)
 208                 nvme_rdma_free_qe(ibdev, &ring[i], capsule_size, dir);
 209         kfree(ring);
 210 }
 211
 212 static struct nvme_rdma_qe *nvme_rdma_alloc_ring(struct ib_device *ibdev,
 213                 size_t ib_queue_size, size_t capsule_size,
 214                 enum dma_data_direction dir)
 215 {
 216         struct nvme_rdma_qe *ring;
 217         int i;
 218
 219         ring = kcalloc(ib_queue_size, sizeof(struct nvme_rdma_qe), GFP_KERNEL);
 220         if (!ring)
 221                 return NULL;
 222
 223         /*
 224          * Bind the CQEs (post recv buffers) DMA mapping to the RDMA queue
 225          * lifetime. It's safe, since any chage in the underlying RDMA device
 226          * will issue error recovery and queue re-creation.
 227          */
 228         for (i = 0; i < ib_queue_size; i++) {
 229                 if (nvme_rdma_alloc_qe(ibdev, &ring[i], capsule_size, dir))
 230                         goto out_free_ring;
 231         }
 232
 233         return ring;
 234
 235 out_free_ring:
 236         nvme_rdma_free_ring(ibdev, ring, i, capsule_size, dir);
 237         return NULL;
 238 }
 239
 240 static void nvme_rdma_qp_event(struct ib_event *event, void *context)
 241 {
 242         pr_debug("QP event %s (%d)\n",
 243                  ib_event_msg(event->event), event->event);
 244
 245 }
 246
 247 static int nvme_rdma_wait_for_cm(struct nvme_rdma_queue *queue)
 248 {
 249         int ret;
 250
 251         ret = wait_for_completion_interruptible_timeout(&queue->cm_done,
 252                         msecs_to_jiffies(NVME_RDMA_CONNECT_TIMEOUT_MS) + 1);
 253         if (ret < 0)
 254                 return ret;
 255         if (ret == 0)
 256                 return -ETIMEDOUT;
 257         WARN_ON_ONCE(queue->cm_error > 0);
 258         return queue->cm_error;
 259 }
 260
 261 static int nvme_rdma_create_qp(struct nvme_rdma_queue *queue, const int factor)
 262 {
 263         struct nvme_rdma_device *dev = queue->device;
 264         struct ib_qp_init_attr init_attr;
 265         int ret;
 266
 267         memset(&init_attr, 0, sizeof(init_attr));
 268         init_attr.event_handler = nvme_rdma_qp_event;
 269         /* +1 for drain */
 270         init_attr.cap.max_send_wr = factor * queue->queue_size + 1;
 271         /* +1 for drain */
 272         init_attr.cap.max_recv_wr = queue->queue_size + 1;
 273         init_attr.cap.max_recv_sge = 1;
 274         init_attr.cap.max_send_sge = 1 + dev->num_inline_segments;
 275         init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 276         init_attr.qp_type = IB_QPT_RC;
 277         init_attr.send_cq = queue->ib_cq;
 278         init_attr.recv_cq = queue->ib_cq;
 279         if (queue->pi_support)
 280                 init_attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN;
 281         init_attr.qp_context = queue;
 282
 283         ret = rdma_create_qp(queue->cm_id, dev->pd, &init_attr);
 284
 285         queue->qp = queue->cm_id->qp;
 286         return ret;
 287 }
 288
 289 static void nvme_rdma_exit_request(struct blk_mq_tag_set *set,
 290                 struct request *rq, unsigned int hctx_idx)
 291 {
 292         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
 293
 294         kfree(req->sqe.data);
 295 }
 296
 297 static int nvme_rdma_init_request(struct blk_mq_tag_set *set,
 298                 struct request *rq, unsigned int hctx_idx,
 299                 unsigned int numa_node)
 300 {
 301         struct nvme_rdma_ctrl *ctrl = set->driver_data;
 302         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
 303         int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0;
 304         struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];
 305
 306         nvme_req(rq)->ctrl = &ctrl->ctrl;
 307         req->sqe.data = kzalloc(sizeof(struct nvme_command), GFP_KERNEL);
 308         if (!req->sqe.data)
 309                 return -ENOMEM;
 310
 311         /* metadata nvme_rdma_sgl struct is located after command's data SGL */
 312         if (queue->pi_support)
 313                 req->metadata_sgl = (void *)nvme_req(rq) +
 314                         sizeof(struct nvme_rdma_request) +
 315                         NVME_RDMA_DATA_SGL_SIZE;
 316
 317         req->queue = queue;
 318         nvme_req(rq)->cmd = req->sqe.data;
 319
 320         return 0;
 321 }
 322
 323 static int nvme_rdma_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
 324                 unsigned int hctx_idx)
 325 {
 326         struct nvme_rdma_ctrl *ctrl = data;
 327         struct nvme_rdma_queue *queue = &ctrl->queues[hctx_idx + 1];
 328
 329         BUG_ON(hctx_idx >= ctrl->ctrl.queue_count);
 330
 331         hctx->driver_data = queue;
 332         return 0;
 333 }
 334
 335 static int nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
 336                 unsigned int hctx_idx)
 337 {
 338         struct nvme_rdma_ctrl *ctrl = data;
 339         struct nvme_rdma_queue *queue = &ctrl->queues[0];
 340
 341         BUG_ON(hctx_idx != 0);
 342
 343         hctx->driver_data = queue;
 344         return 0;
 345 }
 346
 347 static void nvme_rdma_free_dev(struct kref *ref)
 348 {
 349         struct nvme_rdma_device *ndev =
 350                 container_of(ref, struct nvme_rdma_device, ref);
 351
 352         mutex_lock(&device_list_mutex);
 353         list_del(&ndev->entry);
 354         mutex_unlock(&device_list_mutex);
 355
 356         ib_dealloc_pd(ndev->pd);
 357         kfree(ndev);
 358 }
 359
 360 static void nvme_rdma_dev_put(struct nvme_rdma_device *dev)
 361 {
 362         kref_put(&dev->ref, nvme_rdma_free_dev);
 363 }
 364
 365 static int nvme_rdma_dev_get(struct nvme_rdma_device *dev)
 366 {
 367         return kref_get_unless_zero(&dev->ref);
 368 }
 369
 370 static struct nvme_rdma_device *
 371 nvme_rdma_find_get_device(struct rdma_cm_id *cm_id)
 372 {
 373         struct nvme_rdma_device *ndev;
 374
 375         mutex_lock(&device_list_mutex);
 376         list_for_each_entry(ndev, &device_list, entry) {
 377                 if (ndev->dev->node_guid == cm_id->device->node_guid &&
 378                     nvme_rdma_dev_get(ndev))
 379                         goto out_unlock;
 380         }
 381
 382         ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
 383         if (!ndev)
 384                 goto out_err;
 385
 386         ndev->dev = cm_id->device;
 387         kref_init(&ndev->ref);
 388
 389         ndev->pd = ib_alloc_pd(ndev->dev,
 390                 register_always ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY);
 391         if (IS_ERR(ndev->pd))
 392                 goto out_free_dev;
 393
 394         if (!(ndev->dev->attrs.device_cap_flags &
 395               IB_DEVICE_MEM_MGT_EXTENSIONS)) {
 396                 dev_err(&ndev->dev->dev,
 397                         "Memory registrations not supported.\n");
 398                 goto out_free_pd;
 399         }
 400
 401         ndev->num_inline_segments = min(NVME_RDMA_MAX_INLINE_SEGMENTS,
 402                                         ndev->dev->attrs.max_send_sge - 1);
 403         list_add(&ndev->entry, &device_list);
 404 out_unlock:
 405         mutex_unlock(&device_list_mutex);
 406         return ndev;
 407
 408 out_free_pd:
 409         ib_dealloc_pd(ndev->pd);
 410 out_free_dev:
 411         kfree(ndev);
 412 out_err:
 413         mutex_unlock(&device_list_mutex);
 414         return NULL;
 415 }
 416
 417 static void nvme_rdma_free_cq(struct nvme_rdma_queue *queue)
 418 {
 419         if (nvme_rdma_poll_queue(queue))
 420                 ib_free_cq(queue->ib_cq);
 421         else
 422                 ib_cq_pool_put(queue->ib_cq, queue->cq_size);
 423 }
 424
 425 static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue *queue)
 426 {
 427         struct nvme_rdma_device *dev;
 428         struct ib_device *ibdev;
 429
 430         if (!test_and_clear_bit(NVME_RDMA_Q_TR_READY, &queue->flags))
 431                 return;
 432
 433         dev = queue->device;
 434         ibdev = dev->dev;
 435
 436         if (queue->pi_support)
 437                 ib_mr_pool_destroy(queue->qp, &queue->qp->sig_mrs);
 438         ib_mr_pool_destroy(queue->qp, &queue->qp->rdma_mrs);
 439
 440         /*
 441          * The cm_id object might have been destroyed during RDMA connection
 442          * establishment error flow to avoid getting other cma events, thus
 443          * the destruction of the QP shouldn't use rdma_cm API.
 444          */
 445         ib_destroy_qp(queue->qp);
 446         nvme_rdma_free_cq(queue);
 447
 448         nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,
 449                         sizeof(struct nvme_completion), DMA_FROM_DEVICE);
 450
 451         nvme_rdma_dev_put(dev);
 452 }
 453
 454 static int nvme_rdma_get_max_fr_pages(struct ib_device *ibdev, bool pi_support)
 455 {
 456         u32 max_page_list_len;
 457
 458         if (pi_support)
 459                 max_page_list_len = ibdev->attrs.max_pi_fast_reg_page_list_len;
 460         else
 461                 max_page_list_len = ibdev->attrs.max_fast_reg_page_list_len;
 462
 463         return min_t(u32, NVME_RDMA_MAX_SEGMENTS, max_page_list_len - 1);
 464 }
 465
 466 static int nvme_rdma_create_cq(struct ib_device *ibdev,
 467                 struct nvme_rdma_queue *queue)
 468 {
 469         int ret, comp_vector, idx = nvme_rdma_queue_idx(queue);
 470         enum ib_poll_context poll_ctx;
 471
 472         /*
 473          * Spread I/O queues completion vectors according their queue index.
 474          * Admin queues can always go on completion vector 0.
 475          */
 476         comp_vector = (idx == 0 ? idx : idx - 1) % ibdev->num_comp_vectors;
 477
 478         /* Polling queues need direct cq polling context */
 479         if (nvme_rdma_poll_queue(queue)) {
 480                 poll_ctx = IB_POLL_DIRECT;
 481                 queue->ib_cq = ib_alloc_cq(ibdev, queue, queue->cq_size,
 482                                            comp_vector, poll_ctx);
 483         } else {
 484                 poll_ctx = IB_POLL_SOFTIRQ;
 485                 queue->ib_cq = ib_cq_pool_get(ibdev, queue->cq_size,
 486                                               comp_vector, poll_ctx);
 487         }
 488
 489         if (IS_ERR(queue->ib_cq)) {
 490                 ret = PTR_ERR(queue->ib_cq);
 491                 return ret;
 492         }
 493
 494         return 0;
 495 }
 496
 497 static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue *queue)
 498 {
 499         struct ib_device *ibdev;
 500         const int send_wr_factor = 3;                   /* MR, SEND, INV */
 501         const int cq_factor = send_wr_factor + 1;       /* + RECV */
 502         int ret, pages_per_mr;
 503
 504         queue->device = nvme_rdma_find_get_device(queue->cm_id);
 505         if (!queue->device) {
 506                 dev_err(queue->cm_id->device->dev.parent,
 507                         "no client data found!\n");
 508                 return -ECONNREFUSED;
 509         }
 510         ibdev = queue->device->dev;
 511
 512         /* +1 for ib_stop_cq */
 513         queue->cq_size = cq_factor * queue->queue_size + 1;
 514
 515         ret = nvme_rdma_create_cq(ibdev, queue);
 516         if (ret)
 517                 goto out_put_dev;
 518
 519         ret = nvme_rdma_create_qp(queue, send_wr_factor);
 520         if (ret)
 521                 goto out_destroy_ib_cq;
 522
 523         queue->rsp_ring = nvme_rdma_alloc_ring(ibdev, queue->queue_size,
 524                         sizeof(struct nvme_completion), DMA_FROM_DEVICE);
 525         if (!queue->rsp_ring) {
 526                 ret = -ENOMEM;
 527                 goto out_destroy_qp;
 528         }
 529
 530         /*
 531          * Currently we don't use SG_GAPS MR's so if the first entry is
 532          * misaligned we'll end up using two entries for a single data page,
 533          * so one additional entry is required.
 534          */
 535         pages_per_mr = nvme_rdma_get_max_fr_pages(ibdev, queue->pi_support) + 1;
 536         ret = ib_mr_pool_init(queue->qp, &queue->qp->rdma_mrs,
 537                               queue->queue_size,
 538                               IB_MR_TYPE_MEM_REG,
 539                               pages_per_mr, 0);
 540         if (ret) {
 541                 dev_err(queue->ctrl->ctrl.device,
 542                         "failed to initialize MR pool sized %d for QID %d\n",
 543                         queue->queue_size, nvme_rdma_queue_idx(queue));
 544                 goto out_destroy_ring;
 545         }
 546
 547         if (queue->pi_support) {
 548                 ret = ib_mr_pool_init(queue->qp, &queue->qp->sig_mrs,
 549                                       queue->queue_size, IB_MR_TYPE_INTEGRITY,
 550                                       pages_per_mr, pages_per_mr);
 551                 if (ret) {
 552                         dev_err(queue->ctrl->ctrl.device,
 553                                 "failed to initialize PI MR pool sized %d for QID %d\n",
 554                                 queue->queue_size, nvme_rdma_queue_idx(queue));
 555                         goto out_destroy_mr_pool;
 556                 }
 557         }
 558
 559         set_bit(NVME_RDMA_Q_TR_READY, &queue->flags);
 560
 561         return 0;
 562
 563 out_destroy_mr_pool:
 564         ib_mr_pool_destroy(queue->qp, &queue->qp->rdma_mrs);
 565 out_destroy_ring:
 566         nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,
 567                             sizeof(struct nvme_completion), DMA_FROM_DEVICE);
 568 out_destroy_qp:
 569         rdma_destroy_qp(queue->cm_id);
 570 out_destroy_ib_cq:
 571         nvme_rdma_free_cq(queue);
 572 out_put_dev:
 573         nvme_rdma_dev_put(queue->device);
 574         return ret;
 575 }
 576
 577 static int nvme_rdma_alloc_queue(struct nvme_rdma_ctrl *ctrl,
 578                 int idx, size_t queue_size)
 579 {
 580         struct nvme_rdma_queue *queue;
 581         struct sockaddr *src_addr = NULL;
 582         int ret;
 583
 584         queue = &ctrl->queues[idx];
 585         mutex_init(&queue->queue_lock);
 586         queue->ctrl = ctrl;
 587         if (idx && ctrl->ctrl.max_integrity_segments)
 588                 queue->pi_support = true;
 589         else
 590                 queue->pi_support = false;
 591         init_completion(&queue->cm_done);
 592
 593         if (idx > 0)
 594                 queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16;
 595         else
 596                 queue->cmnd_capsule_len = sizeof(struct nvme_command);
 597
 598         queue->queue_size = queue_size;
 599
 600         queue->cm_id = rdma_create_id(&init_net, nvme_rdma_cm_handler, queue,
 601                         RDMA_PS_TCP, IB_QPT_RC);
 602         if (IS_ERR(queue->cm_id)) {
 603                 dev_info(ctrl->ctrl.device,
 604                         "failed to create CM ID: %ld\n", PTR_ERR(queue->cm_id));
 605                 ret = PTR_ERR(queue->cm_id);
 606                 goto out_destroy_mutex;
 607         }
 608
 609         if (ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR)
 610                 src_addr = (struct sockaddr *)&ctrl->src_addr;
 611
 612         queue->cm_error = -ETIMEDOUT;
 613         ret = rdma_resolve_addr(queue->cm_id, src_addr,
 614                         (struct sockaddr *)&ctrl->addr,
 615                         NVME_RDMA_CONNECT_TIMEOUT_MS);
 616         if (ret) {
 617                 dev_info(ctrl->ctrl.device,
 618                         "rdma_resolve_addr failed (%d).\n", ret);
 619                 goto out_destroy_cm_id;
 620         }
 621
 622         ret = nvme_rdma_wait_for_cm(queue);
 623         if (ret) {
 624                 dev_info(ctrl->ctrl.device,
 625                         "rdma connection establishment failed (%d)\n", ret);
 626                 goto out_destroy_cm_id;
 627         }
 628
 629         set_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags);
 630
 631         return 0;
 632
 633 out_destroy_cm_id:
 634         rdma_destroy_id(queue->cm_id);
 635         nvme_rdma_destroy_queue_ib(queue);
 636 out_destroy_mutex:
 637         mutex_destroy(&queue->queue_lock);
 638         return ret;
 639 }
 640
 641 static void __nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
 642 {
 643         rdma_disconnect(queue->cm_id);
 644         ib_drain_qp(queue->qp);
 645 }
 646
 647 static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
 648 {
 649         mutex_lock(&queue->queue_lock);
 650         if (test_and_clear_bit(NVME_RDMA_Q_LIVE, &queue->flags))
 651                 __nvme_rdma_stop_queue(queue);
 652         mutex_unlock(&queue->queue_lock);
 653 }
 654
 655 static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue)
 656 {
 657         if (!test_and_clear_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags))
 658                 return;
 659
 660         rdma_destroy_id(queue->cm_id);
 661         nvme_rdma_destroy_queue_ib(queue);
 662         mutex_destroy(&queue->queue_lock);
 663 }
 664
 665 static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl *ctrl)
 666 {
 667         int i;
 668
 669         for (i = 1; i < ctrl->ctrl.queue_count; i++)
 670                 nvme_rdma_free_queue(&ctrl->queues[i]);
 671 }
 672
 673 static void nvme_rdma_stop_io_queues(struct nvme_rdma_ctrl *ctrl)
 674 {
 675         int i;
 676
 677         for (i = 1; i < ctrl->ctrl.queue_count; i++)
 678                 nvme_rdma_stop_queue(&ctrl->queues[i]);
 679 }
 680
 681 static int nvme_rdma_start_queue(struct nvme_rdma_ctrl *ctrl, int idx)
 682 {
 683         struct nvme_rdma_queue *queue = &ctrl->queues[idx];
 684         int ret;
 685
 686         if (idx)
 687                 ret = nvmf_connect_io_queue(&ctrl->ctrl, idx);
 688         else
 689                 ret = nvmf_connect_admin_queue(&ctrl->ctrl);
 690
 691         if (!ret) {
 692                 set_bit(NVME_RDMA_Q_LIVE, &queue->flags);
 693         } else {
 694                 if (test_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags))
 695                         __nvme_rdma_stop_queue(queue);
 696                 dev_info(ctrl->ctrl.device,
 697                         "failed to connect queue: %d ret=%d\n", idx, ret);
 698         }
 699         return ret;
 700 }
 701
 702 static int nvme_rdma_start_io_queues(struct nvme_rdma_ctrl *ctrl)
 703 {
 704         int i, ret = 0;
 705
 706         for (i = 1; i < ctrl->ctrl.queue_count; i++) {
 707                 ret = nvme_rdma_start_queue(ctrl, i);
 708                 if (ret)
 709                         goto out_stop_queues;
 710         }
 711
 712         return 0;
 713
 714 out_stop_queues:
 715         for (i--; i >= 1; i--)
 716                 nvme_rdma_stop_queue(&ctrl->queues[i]);
 717         return ret;
 718 }
 719
 720 static int nvme_rdma_alloc_io_queues(struct nvme_rdma_ctrl *ctrl)
 721 {
 722         struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
 723         struct ib_device *ibdev = ctrl->device->dev;
 724         unsigned int nr_io_queues, nr_default_queues;
 725         unsigned int nr_read_queues, nr_poll_queues;
 726         int i, ret;
 727
 728         nr_read_queues = min_t(unsigned int, ibdev->num_comp_vectors,
 729                                 min(opts->nr_io_queues, num_online_cpus()));
 730         nr_default_queues =  min_t(unsigned int, ibdev->num_comp_vectors,
 731                                 min(opts->nr_write_queues, num_online_cpus()));
 732         nr_poll_queues = min(opts->nr_poll_queues, num_online_cpus());
 733         nr_io_queues = nr_read_queues + nr_default_queues + nr_poll_queues;
 734
 735         ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);
 736         if (ret)
 737                 return ret;
 738
 739         if (nr_io_queues == 0) {
 740                 dev_err(ctrl->ctrl.device,
 741                         "unable to set any I/O queues\n");
 742                 return -ENOMEM;
 743         }
 744
 745         ctrl->ctrl.queue_count = nr_io_queues + 1;
 746         dev_info(ctrl->ctrl.device,
 747                 "creating %d I/O queues.\n", nr_io_queues);
 748
 749         if (opts->nr_write_queues && nr_read_queues < nr_io_queues) {
 750                 /*
 751                  * separate read/write queues
 752                  * hand out dedicated default queues only after we have
 753                  * sufficient read queues.
 754                  */
 755                 ctrl->io_queues[HCTX_TYPE_READ] = nr_read_queues;
 756                 nr_io_queues -= ctrl->io_queues[HCTX_TYPE_READ];
 757                 ctrl->io_queues[HCTX_TYPE_DEFAULT] =
 758                         min(nr_default_queues, nr_io_queues);
 759                 nr_io_queues -= ctrl->io_queues[HCTX_TYPE_DEFAULT];
 760         } else {
 761                 /*
 762                  * shared read/write queues
 763                  * either no write queues were requested, or we don't have
 764                  * sufficient queue count to have dedicated default queues.
 765                  */
 766                 ctrl->io_queues[HCTX_TYPE_DEFAULT] =
 767                         min(nr_read_queues, nr_io_queues);
 768                 nr_io_queues -= ctrl->io_queues[HCTX_TYPE_DEFAULT];
 769         }
 770
 771         if (opts->nr_poll_queues && nr_io_queues) {
 772                 /* map dedicated poll queues only if we have queues left */
 773                 ctrl->io_queues[HCTX_TYPE_POLL] =
 774                         min(nr_poll_queues, nr_io_queues);
 775         }
 776
 777         for (i = 1; i < ctrl->ctrl.queue_count; i++) {
 778                 ret = nvme_rdma_alloc_queue(ctrl, i,
 779                                 ctrl->ctrl.sqsize + 1);
 780                 if (ret)
 781                         goto out_free_queues;
 782         }
 783
 784         return 0;
 785
 786 out_free_queues:
 787         for (i--; i >= 1; i--)
 788                 nvme_rdma_free_queue(&ctrl->queues[i]);
 789
 790         return ret;
 791 }
 792
 793 static struct blk_mq_tag_set *nvme_rdma_alloc_tagset(struct nvme_ctrl *nctrl,
 794                 bool admin)
 795 {
 796         struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
 797         struct blk_mq_tag_set *set;
 798         int ret;
 799
 800         if (admin) {
 801                 set = &ctrl->admin_tag_set;
 802                 memset(set, 0, sizeof(*set));
 803                 set->ops = &nvme_rdma_admin_mq_ops;
 804                 set->queue_depth = NVME_AQ_MQ_TAG_DEPTH;
 805                 set->reserved_tags = NVMF_RESERVED_TAGS;
 806                 set->numa_node = nctrl->numa_node;
 807                 set->cmd_size = sizeof(struct nvme_rdma_request) +
 808                                 NVME_RDMA_DATA_SGL_SIZE;
 809                 set->driver_data = ctrl;
 810                 set->nr_hw_queues = 1;
 811                 set->timeout = NVME_ADMIN_TIMEOUT;
 812                 set->flags = BLK_MQ_F_NO_SCHED;
 813         } else {
 814                 set = &ctrl->tag_set;
 815                 memset(set, 0, sizeof(*set));
 816                 set->ops = &nvme_rdma_mq_ops;
 817                 set->queue_depth = nctrl->sqsize + 1;
 818                 set->reserved_tags = NVMF_RESERVED_TAGS;
 819                 set->numa_node = nctrl->numa_node;
 820                 set->flags = BLK_MQ_F_SHOULD_MERGE;
 821                 set->cmd_size = sizeof(struct nvme_rdma_request) +
 822                                 NVME_RDMA_DATA_SGL_SIZE;
 823                 if (nctrl->max_integrity_segments)
 824                         set->cmd_size += sizeof(struct nvme_rdma_sgl) +
 825                                          NVME_RDMA_METADATA_SGL_SIZE;
 826                 set->driver_data = ctrl;
 827                 set->nr_hw_queues = nctrl->queue_count - 1;
 828                 set->timeout = NVME_IO_TIMEOUT;
 829                 set->nr_maps = nctrl->opts->nr_poll_queues ? HCTX_MAX_TYPES : 2;
 830         }
 831
 832         ret = blk_mq_alloc_tag_set(set);
 833         if (ret)
 834                 return ERR_PTR(ret);
 835
 836         return set;
 837 }
 838
 839 static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl,
 840                 bool remove)
 841 {
 842         if (remove) {
 843                 blk_cleanup_queue(ctrl->ctrl.admin_q);
 844                 blk_cleanup_queue(ctrl->ctrl.fabrics_q);
 845                 blk_mq_free_tag_set(ctrl->ctrl.admin_tagset);
 846         }
 847         if (ctrl->async_event_sqe.data) {
 848                 cancel_work_sync(&ctrl->ctrl.async_event_work);
 849                 nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,
 850                                 sizeof(struct nvme_command), DMA_TO_DEVICE);
 851                 ctrl->async_event_sqe.data = NULL;
 852         }
 853         nvme_rdma_free_queue(&ctrl->queues[0]);
 854 }
 855
 856 static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl,
 857                 bool new)
 858 {
 859         bool pi_capable = false;
 860         int error;
 861
 862         error = nvme_rdma_alloc_queue(ctrl, 0, NVME_AQ_DEPTH);
 863         if (error)
 864                 return error;
 865
 866         ctrl->device = ctrl->queues[0].device;
 867         ctrl->ctrl.numa_node = ibdev_to_node(ctrl->device->dev);
 868
 869         /* T10-PI support */
 870         if (ctrl->device->dev->attrs.kernel_cap_flags &
 871             IBK_INTEGRITY_HANDOVER)
 872                 pi_capable = true;
 873
 874         ctrl->max_fr_pages = nvme_rdma_get_max_fr_pages(ctrl->device->dev,
 875                                                         pi_capable);
 876
 877         /*
 878          * Bind the async event SQE DMA mapping to the admin queue lifetime.
 879          * It's safe, since any chage in the underlying RDMA device will issue
 880          * error recovery and queue re-creation.
 881          */
 882         error = nvme_rdma_alloc_qe(ctrl->device->dev, &ctrl->async_event_sqe,
 883                         sizeof(struct nvme_command), DMA_TO_DEVICE);
 884         if (error)
 885                 goto out_free_queue;
 886
 887         if (new) {
 888                 ctrl->ctrl.admin_tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, true);
 889                 if (IS_ERR(ctrl->ctrl.admin_tagset)) {
 890                         error = PTR_ERR(ctrl->ctrl.admin_tagset);
 891                         goto out_free_async_qe;
 892                 }
 893
 894                 ctrl->ctrl.fabrics_q = blk_mq_init_queue(&ctrl->admin_tag_set);
 895                 if (IS_ERR(ctrl->ctrl.fabrics_q)) {
 896                         error = PTR_ERR(ctrl->ctrl.fabrics_q);
 897                         goto out_free_tagset;
 898                 }
 899
 900                 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
 901                 if (IS_ERR(ctrl->ctrl.admin_q)) {
 902                         error = PTR_ERR(ctrl->ctrl.admin_q);
 903                         goto out_cleanup_fabrics_q;
 904                 }
 905         }
 906
 907         error = nvme_rdma_start_queue(ctrl, 0);
 908         if (error)
 909                 goto out_cleanup_queue;
 910
 911         error = nvme_enable_ctrl(&ctrl->ctrl);
 912         if (error)
 913                 goto out_stop_queue;
 914
 915         ctrl->ctrl.max_segments = ctrl->max_fr_pages;
 916         ctrl->ctrl.max_hw_sectors = ctrl->max_fr_pages << (ilog2(SZ_4K) - 9);
 917         if (pi_capable)
 918                 ctrl->ctrl.max_integrity_segments = ctrl->max_fr_pages;
 919         else
 920                 ctrl->ctrl.max_integrity_segments = 0;
 921
 922         nvme_start_admin_queue(&ctrl->ctrl);
 923
 924         error = nvme_init_ctrl_finish(&ctrl->ctrl);
 925         if (error)
 926                 goto out_quiesce_queue;
 927
 928         return 0;
 929
 930 out_quiesce_queue:
 931         nvme_stop_admin_queue(&ctrl->ctrl);
 932         blk_sync_queue(ctrl->ctrl.admin_q);
 933 out_stop_queue:
 934         nvme_rdma_stop_queue(&ctrl->queues[0]);
 935         nvme_cancel_admin_tagset(&ctrl->ctrl);
 936 out_cleanup_queue:
 937         if (new)
 938                 blk_cleanup_queue(ctrl->ctrl.admin_q);
 939 out_cleanup_fabrics_q:
 940         if (new)
 941                 blk_cleanup_queue(ctrl->ctrl.fabrics_q);
 942 out_free_tagset:
 943         if (new)
 944                 blk_mq_free_tag_set(ctrl->ctrl.admin_tagset);
 945 out_free_async_qe:
 946         if (ctrl->async_event_sqe.data) {
 947                 nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,
 948                         sizeof(struct nvme_command), DMA_TO_DEVICE);
 949                 ctrl->async_event_sqe.data = NULL;
 950         }
 951 out_free_queue:
 952         nvme_rdma_free_queue(&ctrl->queues[0]);
 953         return error;
 954 }
 955
 956 static void nvme_rdma_destroy_io_queues(struct nvme_rdma_ctrl *ctrl,
 957                 bool remove)
 958 {
 959         if (remove) {
 960                 blk_cleanup_queue(ctrl->ctrl.connect_q);
 961                 blk_mq_free_tag_set(ctrl->ctrl.tagset);
 962         }
 963         nvme_rdma_free_io_queues(ctrl);
 964 }
 965
 966 static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new)
 967 {
 968         int ret;
 969
 970         ret = nvme_rdma_alloc_io_queues(ctrl);
 971         if (ret)
 972                 return ret;
 973
 974         if (new) {
 975                 ctrl->ctrl.tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, false);
 976                 if (IS_ERR(ctrl->ctrl.tagset)) {
 977                         ret = PTR_ERR(ctrl->ctrl.tagset);
 978                         goto out_free_io_queues;
 979                 }
 980
 981                 ret = nvme_ctrl_init_connect_q(&(ctrl->ctrl));
 982                 if (ret)
 983                         goto out_free_tag_set;
 984         }
 985
 986         ret = nvme_rdma_start_io_queues(ctrl);
 987         if (ret)
 988                 goto out_cleanup_connect_q;
 989
 990         if (!new) {
 991                 nvme_start_queues(&ctrl->ctrl);
 992                 if (!nvme_wait_freeze_timeout(&ctrl->ctrl, NVME_IO_TIMEOUT)) {
 993                         /*
 994                          * If we timed out waiting for freeze we are likely to
 995                          * be stuck.  Fail the controller initialization just
 996                          * to be safe.
 997                          */
 998                         ret = -ENODEV;
 999                         goto out_wait_freeze_timed_out;
1000                 }
1001                 blk_mq_update_nr_hw_queues(ctrl->ctrl.tagset,
1002                         ctrl->ctrl.queue_count - 1);
1003                 nvme_unfreeze(&ctrl->ctrl);
1004         }
1005
1006         return 0;
1007
1008 out_wait_freeze_timed_out:
1009         nvme_stop_queues(&ctrl->ctrl);
1010         nvme_sync_io_queues(&ctrl->ctrl);
1011         nvme_rdma_stop_io_queues(ctrl);
1012 out_cleanup_connect_q:
1013         nvme_cancel_tagset(&ctrl->ctrl);
1014         if (new)
1015                 blk_cleanup_queue(ctrl->ctrl.connect_q);
1016 out_free_tag_set:
1017         if (new)
1018                 blk_mq_free_tag_set(ctrl->ctrl.tagset);
1019 out_free_io_queues:
1020         nvme_rdma_free_io_queues(ctrl);
1021         return ret;
1022 }
1023
1024 static void nvme_rdma_teardown_admin_queue(struct nvme_rdma_ctrl *ctrl,
1025                 bool remove)
1026 {
1027         nvme_stop_admin_queue(&ctrl->ctrl);
1028         blk_sync_queue(ctrl->ctrl.admin_q);
1029         nvme_rdma_stop_queue(&ctrl->queues[0]);
1030         nvme_cancel_admin_tagset(&ctrl->ctrl);
1031         if (remove)
1032                 nvme_start_admin_queue(&ctrl->ctrl);
1033         nvme_rdma_destroy_admin_queue(ctrl, remove);
1034 }
1035
1036 static void nvme_rdma_teardown_io_queues(struct nvme_rdma_ctrl *ctrl,
1037                 bool remove)
1038 {
1039         if (ctrl->ctrl.queue_count > 1) {
1040                 nvme_start_freeze(&ctrl->ctrl);
1041                 nvme_stop_queues(&ctrl->ctrl);
1042                 nvme_sync_io_queues(&ctrl->ctrl);
1043                 nvme_rdma_stop_io_queues(ctrl);
1044                 nvme_cancel_tagset(&ctrl->ctrl);
1045                 if (remove)
1046                         nvme_start_queues(&ctrl->ctrl);
1047                 nvme_rdma_destroy_io_queues(ctrl, remove);
1048         }
1049 }
1050
1051 static void nvme_rdma_stop_ctrl(struct nvme_ctrl *nctrl)
1052 {
1053         struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
1054
1055         cancel_work_sync(&ctrl->err_work);
1056         cancel_delayed_work_sync(&ctrl->reconnect_work);
1057 }
1058
1059 static void nvme_rdma_free_ctrl(struct nvme_ctrl *nctrl)
1060 {
1061         struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
1062
1063         if (list_empty(&ctrl->list))
1064                 goto free_ctrl;
1065
1066         mutex_lock(&nvme_rdma_ctrl_mutex);
1067         list_del(&ctrl->list);
1068         mutex_unlock(&nvme_rdma_ctrl_mutex);
1069
1070         nvmf_free_options(nctrl->opts);
1071 free_ctrl:
1072         kfree(ctrl->queues);
1073         kfree(ctrl);
1074 }
1075
1076 static void nvme_rdma_reconnect_or_remove(struct nvme_rdma_ctrl *ctrl)
1077 {
1078         /* If we are resetting/deleting then do nothing */
1079         if (ctrl->ctrl.state != NVME_CTRL_CONNECTING) {
1080                 WARN_ON_ONCE(ctrl->ctrl.state == NVME_CTRL_NEW ||
1081                         ctrl->ctrl.state == NVME_CTRL_LIVE);
1082                 return;
1083         }
1084
1085         if (nvmf_should_reconnect(&ctrl->ctrl)) {
1086                 dev_info(ctrl->ctrl.device, "Reconnecting in %d seconds...\n",
1087                         ctrl->ctrl.opts->reconnect_delay);
1088                 queue_delayed_work(nvme_wq, &ctrl->reconnect_work,
1089                                 ctrl->ctrl.opts->reconnect_delay * HZ);
1090         } else {
1091                 nvme_delete_ctrl(&ctrl->ctrl);
1092         }
1093 }
1094
1095 static int nvme_rdma_setup_ctrl(struct nvme_rdma_ctrl *ctrl, bool new)
1096 {
1097         int ret;
1098         bool changed;
1099
1100         ret = nvme_rdma_configure_admin_queue(ctrl, new);
1101         if (ret)
1102                 return ret;
1103
1104         if (ctrl->ctrl.icdoff) {
1105                 ret = -EOPNOTSUPP;
1106                 dev_err(ctrl->ctrl.device, "icdoff is not supported!\n");
1107                 goto destroy_admin;
1108         }
1109
1110         if (!(ctrl->ctrl.sgls & (1 << 2))) {
1111                 ret = -EOPNOTSUPP;
1112                 dev_err(ctrl->ctrl.device,
1113                         "Mandatory keyed sgls are not supported!\n");
1114                 goto destroy_admin;
1115         }
1116
1117         if (ctrl->ctrl.opts->queue_size > ctrl->ctrl.sqsize + 1) {
1118                 dev_warn(ctrl->ctrl.device,
1119                         "queue_size %zu > ctrl sqsize %u, clamping down\n",
1120                         ctrl->ctrl.opts->queue_size, ctrl->ctrl.sqsize + 1);
1121         }
1122
1123         if (ctrl->ctrl.sqsize + 1 > NVME_RDMA_MAX_QUEUE_SIZE) {
1124                 dev_warn(ctrl->ctrl.device,
1125                         "ctrl sqsize %u > max queue size %u, clamping down\n",
1126                         ctrl->ctrl.sqsize + 1, NVME_RDMA_MAX_QUEUE_SIZE);
1127                 ctrl->ctrl.sqsize = NVME_RDMA_MAX_QUEUE_SIZE - 1;
1128         }
1129
1130         if (ctrl->ctrl.sqsize + 1 > ctrl->ctrl.maxcmd) {
1131                 dev_warn(ctrl->ctrl.device,
1132                         "sqsize %u > ctrl maxcmd %u, clamping down\n",
1133                         ctrl->ctrl.sqsize + 1, ctrl->ctrl.maxcmd);
1134                 ctrl->ctrl.sqsize = ctrl->ctrl.maxcmd - 1;
1135         }
1136
1137         if (ctrl->ctrl.sgls & (1 << 20))
1138                 ctrl->use_inline_data = true;
1139
1140         if (ctrl->ctrl.queue_count > 1) {
1141                 ret = nvme_rdma_configure_io_queues(ctrl, new);
1142                 if (ret)
1143                         goto destroy_admin;
1144         }
1145
1146         changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
1147         if (!changed) {
1148                 /*
1149                  * state change failure is ok if we started ctrl delete,
1150                  * unless we're during creation of a new controller to
1151                  * avoid races with teardown flow.
1152                  */
1153                 WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING &&
1154                              ctrl->ctrl.state != NVME_CTRL_DELETING_NOIO);
1155                 WARN_ON_ONCE(new);
1156                 ret = -EINVAL;
1157                 goto destroy_io;
1158         }
1159
1160         nvme_start_ctrl(&ctrl->ctrl);
1161         return 0;
1162
1163 destroy_io:
1164         if (ctrl->ctrl.queue_count > 1) {
1165                 nvme_stop_queues(&ctrl->ctrl);
1166                 nvme_sync_io_queues(&ctrl->ctrl);
1167                 nvme_rdma_stop_io_queues(ctrl);
1168                 nvme_cancel_tagset(&ctrl->ctrl);
1169                 nvme_rdma_destroy_io_queues(ctrl, new);
1170         }
1171 destroy_admin:
1172         nvme_stop_admin_queue(&ctrl->ctrl);
1173         blk_sync_queue(ctrl->ctrl.admin_q);
1174         nvme_rdma_stop_queue(&ctrl->queues[0]);
1175         nvme_cancel_admin_tagset(&ctrl->ctrl);
1176         nvme_rdma_destroy_admin_queue(ctrl, new);
1177         return ret;
1178 }
1179
1180 static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work)
1181 {
1182         struct nvme_rdma_ctrl *ctrl = container_of(to_delayed_work(work),
1183                         struct nvme_rdma_ctrl, reconnect_work);
1184
1185         ++ctrl->ctrl.nr_reconnects;
1186
1187         if (nvme_rdma_setup_ctrl(ctrl, false))
1188                 goto requeue;
1189
1190         dev_info(ctrl->ctrl.device, "Successfully reconnected (%d attempts)\n",
1191                         ctrl->ctrl.nr_reconnects);
1192
1193         ctrl->ctrl.nr_reconnects = 0;
1194
1195         return;
1196
1197 requeue:
1198         dev_info(ctrl->ctrl.device, "Failed reconnect attempt %d\n",
1199                         ctrl->ctrl.nr_reconnects);
1200         nvme_rdma_reconnect_or_remove(ctrl);
1201 }
1202
1203 static void nvme_rdma_error_recovery_work(struct work_struct *work)
1204 {
1205         struct nvme_rdma_ctrl *ctrl = container_of(work,
1206                         struct nvme_rdma_ctrl, err_work);
1207
1208         nvme_stop_keep_alive(&ctrl->ctrl);
1209         flush_work(&ctrl->ctrl.async_event_work);
1210         nvme_rdma_teardown_io_queues(ctrl, false);
1211         nvme_start_queues(&ctrl->ctrl);
1212         nvme_rdma_teardown_admin_queue(ctrl, false);
1213         nvme_start_admin_queue(&ctrl->ctrl);
1214
1215         if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
1216                 /* state change failure is ok if we started ctrl delete */
1217                 WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING &&
1218                              ctrl->ctrl.state != NVME_CTRL_DELETING_NOIO);
1219                 return;
1220         }
1221
1222         nvme_rdma_reconnect_or_remove(ctrl);
1223 }
1224
1225 static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl *ctrl)
1226 {
1227         if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING))
1228                 return;
1229
1230         dev_warn(ctrl->ctrl.device, "starting error recovery\n");
1231         queue_work(nvme_reset_wq, &ctrl->err_work);
1232 }
1233
1234 static void nvme_rdma_end_request(struct nvme_rdma_request *req)
1235 {
1236         struct request *rq = blk_mq_rq_from_pdu(req);
1237
1238         if (!refcount_dec_and_test(&req->ref))
1239                 return;
1240         if (!nvme_try_complete_req(rq, req->status, req->result))
1241                 nvme_rdma_complete_rq(rq);
1242 }
1243
1244 static void nvme_rdma_wr_error(struct ib_cq *cq, struct ib_wc *wc,
1245                 const char *op)
1246 {
1247         struct nvme_rdma_queue *queue = wc->qp->qp_context;
1248         struct nvme_rdma_ctrl *ctrl = queue->ctrl;
1249
1250         if (ctrl->ctrl.state == NVME_CTRL_LIVE)
1251                 dev_info(ctrl->ctrl.device,
1252                              "%s for CQE 0x%p failed with status %s (%d)\n",
1253                              op, wc->wr_cqe,
1254                              ib_wc_status_msg(wc->status), wc->status);
1255         nvme_rdma_error_recovery(ctrl);
1256 }
1257
1258 static void nvme_rdma_memreg_done(struct ib_cq *cq, struct ib_wc *wc)
1259 {
1260         if (unlikely(wc->status != IB_WC_SUCCESS))
1261                 nvme_rdma_wr_error(cq, wc, "MEMREG");
1262 }
1263
1264 static void nvme_rdma_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc)
1265 {
1266         struct nvme_rdma_request *req =
1267                 container_of(wc->wr_cqe, struct nvme_rdma_request, reg_cqe);
1268
1269         if (unlikely(wc->status != IB_WC_SUCCESS))
1270                 nvme_rdma_wr_error(cq, wc, "LOCAL_INV");
1271         else
1272                 nvme_rdma_end_request(req);
1273 }
1274
1275 static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue,
1276                 struct nvme_rdma_request *req)
1277 {
1278         struct ib_send_wr wr = {
1279                 .opcode             = IB_WR_LOCAL_INV,
1280                 .next               = NULL,
1281                 .num_sge            = 0,
1282                 .send_flags         = IB_SEND_SIGNALED,
1283                 .ex.invalidate_rkey = req->mr->rkey,
1284         };
1285
1286         req->reg_cqe.done = nvme_rdma_inv_rkey_done;
1287         wr.wr_cqe = &req->reg_cqe;
1288
1289         return ib_post_send(queue->qp, &wr, NULL);
1290 }
1291
1292 static void nvme_rdma_dma_unmap_req(struct ib_device *ibdev, struct request *rq)
1293 {
1294         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1295
1296         if (blk_integrity_rq(rq)) {
1297                 ib_dma_unmap_sg(ibdev, req->metadata_sgl->sg_table.sgl,
1298                                 req->metadata_sgl->nents, rq_dma_dir(rq));
1299                 sg_free_table_chained(&req->metadata_sgl->sg_table,
1300                                       NVME_INLINE_METADATA_SG_CNT);
1301         }
1302
1303         ib_dma_unmap_sg(ibdev, req->data_sgl.sg_table.sgl, req->data_sgl.nents,
1304                         rq_dma_dir(rq));
1305         sg_free_table_chained(&req->data_sgl.sg_table, NVME_INLINE_SG_CNT);
1306 }
1307
1308 static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue,
1309                 struct request *rq)
1310 {
1311         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1312         struct nvme_rdma_device *dev = queue->device;
1313         struct ib_device *ibdev = dev->dev;
1314         struct list_head *pool = &queue->qp->rdma_mrs;
1315
1316         if (!blk_rq_nr_phys_segments(rq))
1317                 return;
1318
1319         if (req->use_sig_mr)
1320                 pool = &queue->qp->sig_mrs;
1321
1322         if (req->mr) {
1323                 ib_mr_pool_put(queue->qp, pool, req->mr);
1324                 req->mr = NULL;
1325         }
1326
1327         nvme_rdma_dma_unmap_req(ibdev, rq);
1328 }
1329
1330 static int nvme_rdma_set_sg_null(struct nvme_command *c)
1331 {
1332         struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
1333
1334         sg->addr = 0;
1335         put_unaligned_le24(0, sg->length);
1336         put_unaligned_le32(0, sg->key);
1337         sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
1338         return 0;
1339 }
1340
1341 static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue *queue,
1342                 struct nvme_rdma_request *req, struct nvme_command *c,
1343                 int count)
1344 {
1345         struct nvme_sgl_desc *sg = &c->common.dptr.sgl;
1346         struct ib_sge *sge = &req->sge[1];
1347         struct scatterlist *sgl;
1348         u32 len = 0;
1349         int i;
1350
1351         for_each_sg(req->data_sgl.sg_table.sgl, sgl, count, i) {
1352                 sge->addr = sg_dma_address(sgl);
1353                 sge->length = sg_dma_len(sgl);
1354                 sge->lkey = queue->device->pd->local_dma_lkey;
1355                 len += sge->length;
1356                 sge++;
1357         }
1358
1359         sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff);
1360         sg->length = cpu_to_le32(len);
1361         sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET;
1362
1363         req->num_sge += count;
1364         return 0;
1365 }
1366
1367 static int nvme_rdma_map_sg_single(struct nvme_rdma_queue *queue,
1368                 struct nvme_rdma_request *req, struct nvme_command *c)
1369 {
1370         struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
1371
1372         sg->addr = cpu_to_le64(sg_dma_address(req->data_sgl.sg_table.sgl));
1373         put_unaligned_le24(sg_dma_len(req->data_sgl.sg_table.sgl), sg->length);
1374         put_unaligned_le32(queue->device->pd->unsafe_global_rkey, sg->key);
1375         sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
1376         return 0;
1377 }
1378
1379 static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue *queue,
1380                 struct nvme_rdma_request *req, struct nvme_command *c,
1381                 int count)
1382 {
1383         struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
1384         int nr;
1385
1386         req->mr = ib_mr_pool_get(queue->qp, &queue->qp->rdma_mrs);
1387         if (WARN_ON_ONCE(!req->mr))
1388                 return -EAGAIN;
1389
1390         /*
1391          * Align the MR to a 4K page size to match the ctrl page size and
1392          * the block virtual boundary.
1393          */
1394         nr = ib_map_mr_sg(req->mr, req->data_sgl.sg_table.sgl, count, NULL,
1395                           SZ_4K);
1396         if (unlikely(nr < count)) {
1397                 ib_mr_pool_put(queue->qp, &queue->qp->rdma_mrs, req->mr);
1398                 req->mr = NULL;
1399                 if (nr < 0)
1400                         return nr;
1401                 return -EINVAL;
1402         }
1403
1404         ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey));
1405
1406         req->reg_cqe.done = nvme_rdma_memreg_done;
1407         memset(&req->reg_wr, 0, sizeof(req->reg_wr));
1408         req->reg_wr.wr.opcode = IB_WR_REG_MR;
1409         req->reg_wr.wr.wr_cqe = &req->reg_cqe;
1410         req->reg_wr.wr.num_sge = 0;
1411         req->reg_wr.mr = req->mr;
1412         req->reg_wr.key = req->mr->rkey;
1413         req->reg_wr.access = IB_ACCESS_LOCAL_WRITE |
1414                              IB_ACCESS_REMOTE_READ |
1415                              IB_ACCESS_REMOTE_WRITE;
1416
1417         sg->addr = cpu_to_le64(req->mr->iova);
1418         put_unaligned_le24(req->mr->length, sg->length);
1419         put_unaligned_le32(req->mr->rkey, sg->key);
1420         sg->type = (NVME_KEY_SGL_FMT_DATA_DESC << 4) |
1421                         NVME_SGL_FMT_INVALIDATE;
1422
1423         return 0;
1424 }
1425
1426 static void nvme_rdma_set_sig_domain(struct blk_integrity *bi,
1427                 struct nvme_command *cmd, struct ib_sig_domain *domain,
1428                 u16 control, u8 pi_type)
1429 {
1430         domain->sig_type = IB_SIG_TYPE_T10_DIF;
1431         domain->sig.dif.bg_type = IB_T10DIF_CRC;
1432         domain->sig.dif.pi_interval = 1 << bi->interval_exp;
1433         domain->sig.dif.ref_tag = le32_to_cpu(cmd->rw.reftag);
1434         if (control & NVME_RW_PRINFO_PRCHK_REF)
1435                 domain->sig.dif.ref_remap = true;
1436
1437         domain->sig.dif.app_tag = le16_to_cpu(cmd->rw.apptag);
1438         domain->sig.dif.apptag_check_mask = le16_to_cpu(cmd->rw.appmask);
1439         domain->sig.dif.app_escape = true;
1440         if (pi_type == NVME_NS_DPS_PI_TYPE3)
1441                 domain->sig.dif.ref_escape = true;
1442 }
1443
1444 static void nvme_rdma_set_sig_attrs(struct blk_integrity *bi,
1445                 struct nvme_command *cmd, struct ib_sig_attrs *sig_attrs,
1446                 u8 pi_type)
1447 {
1448         u16 control = le16_to_cpu(cmd->rw.control);
1449
1450         memset(sig_attrs, 0, sizeof(*sig_attrs));
1451         if (control & NVME_RW_PRINFO_PRACT) {
1452                 /* for WRITE_INSERT/READ_STRIP no memory domain */
1453                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
1454                 nvme_rdma_set_sig_domain(bi, cmd, &sig_attrs->wire, control,
1455                                          pi_type);
1456                 /* Clear the PRACT bit since HCA will generate/verify the PI */
1457                 control &= ~NVME_RW_PRINFO_PRACT;
1458                 cmd->rw.control = cpu_to_le16(control);
1459         } else {
1460                 /* for WRITE_PASS/READ_PASS both wire/memory domains exist */
1461                 nvme_rdma_set_sig_domain(bi, cmd, &sig_attrs->wire, control,
1462                                          pi_type);
1463                 nvme_rdma_set_sig_domain(bi, cmd, &sig_attrs->mem, control,
1464                                          pi_type);
1465         }
1466 }
1467
1468 static void nvme_rdma_set_prot_checks(struct nvme_command *cmd, u8 *mask)
1469 {
1470         *mask = 0;
1471         if (le16_to_cpu(cmd->rw.control) & NVME_RW_PRINFO_PRCHK_REF)
1472                 *mask |= IB_SIG_CHECK_REFTAG;
1473         if (le16_to_cpu(cmd->rw.control) & NVME_RW_PRINFO_PRCHK_GUARD)
1474                 *mask |= IB_SIG_CHECK_GUARD;
1475 }
1476
1477 static void nvme_rdma_sig_done(struct ib_cq *cq, struct ib_wc *wc)
1478 {
1479         if (unlikely(wc->status != IB_WC_SUCCESS))
1480                 nvme_rdma_wr_error(cq, wc, "SIG");
1481 }
1482
1483 static int nvme_rdma_map_sg_pi(struct nvme_rdma_queue *queue,
1484                 struct nvme_rdma_request *req, struct nvme_command *c,
1485                 int count, int pi_count)
1486 {
1487         struct nvme_rdma_sgl *sgl = &req->data_sgl;
1488         struct ib_reg_wr *wr = &req->reg_wr;
1489         struct request *rq = blk_mq_rq_from_pdu(req);
1490         struct nvme_ns *ns = rq->q->queuedata;
1491         struct bio *bio = rq->bio;
1492         struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
1493         int nr;
1494
1495         req->mr = ib_mr_pool_get(queue->qp, &queue->qp->sig_mrs);
1496         if (WARN_ON_ONCE(!req->mr))
1497                 return -EAGAIN;
1498
1499         nr = ib_map_mr_sg_pi(req->mr, sgl->sg_table.sgl, count, NULL,
1500                              req->metadata_sgl->sg_table.sgl, pi_count, NULL,
1501                              SZ_4K);
1502         if (unlikely(nr))
1503                 goto mr_put;
1504
1505         nvme_rdma_set_sig_attrs(blk_get_integrity(bio->bi_bdev->bd_disk), c,
1506                                 req->mr->sig_attrs, ns->pi_type);
1507         nvme_rdma_set_prot_checks(c, &req->mr->sig_attrs->check_mask);
1508
1509         ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey));
1510
1511         req->reg_cqe.done = nvme_rdma_sig_done;
1512         memset(wr, 0, sizeof(*wr));
1513         wr->wr.opcode = IB_WR_REG_MR_INTEGRITY;
1514         wr->wr.wr_cqe = &req->reg_cqe;
1515         wr->wr.num_sge = 0;
1516         wr->wr.send_flags = 0;
1517         wr->mr = req->mr;
1518         wr->key = req->mr->rkey;
1519         wr->access = IB_ACCESS_LOCAL_WRITE |
1520                      IB_ACCESS_REMOTE_READ |
1521                      IB_ACCESS_REMOTE_WRITE;
1522
1523         sg->addr = cpu_to_le64(req->mr->iova);
1524         put_unaligned_le24(req->mr->length, sg->length);
1525         put_unaligned_le32(req->mr->rkey, sg->key);
1526         sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
1527
1528         return 0;
1529
1530 mr_put:
1531         ib_mr_pool_put(queue->qp, &queue->qp->sig_mrs, req->mr);
1532         req->mr = NULL;
1533         if (nr < 0)
1534                 return nr;
1535         return -EINVAL;
1536 }
1537
1538 static int nvme_rdma_dma_map_req(struct ib_device *ibdev, struct request *rq,
1539                 int *count, int *pi_count)
1540 {
1541         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1542         int ret;
1543
1544         req->data_sgl.sg_table.sgl = (struct scatterlist *)(req + 1);
1545         ret = sg_alloc_table_chained(&req->data_sgl.sg_table,
1546                         blk_rq_nr_phys_segments(rq), req->data_sgl.sg_table.sgl,
1547                         NVME_INLINE_SG_CNT);
1548         if (ret)
1549                 return -ENOMEM;
1550
1551         req->data_sgl.nents = blk_rq_map_sg(rq->q, rq,
1552                                             req->data_sgl.sg_table.sgl);
1553
1554         *count = ib_dma_map_sg(ibdev, req->data_sgl.sg_table.sgl,
1555                                req->data_sgl.nents, rq_dma_dir(rq));
1556         if (unlikely(*count <= 0)) {
1557                 ret = -EIO;
1558                 goto out_free_table;
1559         }
1560
1561         if (blk_integrity_rq(rq)) {
1562                 req->metadata_sgl->sg_table.sgl =
1563                         (struct scatterlist *)(req->metadata_sgl + 1);
1564                 ret = sg_alloc_table_chained(&req->metadata_sgl->sg_table,
1565                                 blk_rq_count_integrity_sg(rq->q, rq->bio),
1566                                 req->metadata_sgl->sg_table.sgl,
1567                                 NVME_INLINE_METADATA_SG_CNT);
1568                 if (unlikely(ret)) {
1569                         ret = -ENOMEM;
1570                         goto out_unmap_sg;
1571                 }
1572
1573                 req->metadata_sgl->nents = blk_rq_map_integrity_sg(rq->q,
1574                                 rq->bio, req->metadata_sgl->sg_table.sgl);
1575                 *pi_count = ib_dma_map_sg(ibdev,
1576                                           req->metadata_sgl->sg_table.sgl,
1577                                           req->metadata_sgl->nents,
1578                                           rq_dma_dir(rq));
1579                 if (unlikely(*pi_count <= 0)) {
1580                         ret = -EIO;
1581                         goto out_free_pi_table;
1582                 }
1583         }
1584
1585         return 0;
1586
1587 out_free_pi_table:
1588         sg_free_table_chained(&req->metadata_sgl->sg_table,
1589                               NVME_INLINE_METADATA_SG_CNT);
1590 out_unmap_sg:
1591         ib_dma_unmap_sg(ibdev, req->data_sgl.sg_table.sgl, req->data_sgl.nents,
1592                         rq_dma_dir(rq));
1593 out_free_table:
1594         sg_free_table_chained(&req->data_sgl.sg_table, NVME_INLINE_SG_CNT);
1595         return ret;
1596 }
1597
1598 static int nvme_rdma_map_data(struct nvme_rdma_queue *queue,
1599                 struct request *rq, struct nvme_command *c)
1600 {
1601         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1602         struct nvme_rdma_device *dev = queue->device;
1603         struct ib_device *ibdev = dev->dev;
1604         int pi_count = 0;
1605         int count, ret;
1606
1607         req->num_sge = 1;
1608         refcount_set(&req->ref, 2); /* send and recv completions */
1609
1610         c->common.flags |= NVME_CMD_SGL_METABUF;
1611
1612         if (!blk_rq_nr_phys_segments(rq))
1613                 return nvme_rdma_set_sg_null(c);
1614
1615         ret = nvme_rdma_dma_map_req(ibdev, rq, &count, &pi_count);
1616         if (unlikely(ret))
1617                 return ret;
1618
1619         if (req->use_sig_mr) {
1620                 ret = nvme_rdma_map_sg_pi(queue, req, c, count, pi_count);
1621                 goto out;
1622         }
1623
1624         if (count <= dev->num_inline_segments) {
1625                 if (rq_data_dir(rq) == WRITE && nvme_rdma_queue_idx(queue) &&
1626                     queue->ctrl->use_inline_data &&
1627                     blk_rq_payload_bytes(rq) <=
1628                                 nvme_rdma_inline_data_size(queue)) {
1629                         ret = nvme_rdma_map_sg_inline(queue, req, c, count);
1630                         goto out;
1631                 }
1632
1633                 if (count == 1 && dev->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY) {
1634                         ret = nvme_rdma_map_sg_single(queue, req, c);
1635                         goto out;
1636                 }
1637         }
1638
1639         ret = nvme_rdma_map_sg_fr(queue, req, c, count);
1640 out:
1641         if (unlikely(ret))
1642                 goto out_dma_unmap_req;
1643
1644         return 0;
1645
1646 out_dma_unmap_req:
1647         nvme_rdma_dma_unmap_req(ibdev, rq);
1648         return ret;
1649 }
1650
1651 static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
1652 {
1653         struct nvme_rdma_qe *qe =
1654                 container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
1655         struct nvme_rdma_request *req =
1656                 container_of(qe, struct nvme_rdma_request, sqe);
1657
1658         if (unlikely(wc->status != IB_WC_SUCCESS))
1659                 nvme_rdma_wr_error(cq, wc, "SEND");
1660         else
1661                 nvme_rdma_end_request(req);
1662 }
1663
1664 static int nvme_rdma_post_send(struct nvme_rdma_queue *queue,
1665                 struct nvme_rdma_qe *qe, struct ib_sge *sge, u32 num_sge,
1666                 struct ib_send_wr *first)
1667 {
1668         struct ib_send_wr wr;
1669         int ret;
1670
1671         sge->addr   = qe->dma;
1672         sge->length = sizeof(struct nvme_command);
1673         sge->lkey   = queue->device->pd->local_dma_lkey;
1674
1675         wr.next       = NULL;
1676         wr.wr_cqe     = &qe->cqe;
1677         wr.sg_list    = sge;
1678         wr.num_sge    = num_sge;
1679         wr.opcode     = IB_WR_SEND;
1680         wr.send_flags = IB_SEND_SIGNALED;
1681
1682         if (first)
1683                 first->next = &wr;
1684         else
1685                 first = &wr;
1686
1687         ret = ib_post_send(queue->qp, first, NULL);
1688         if (unlikely(ret)) {
1689                 dev_err(queue->ctrl->ctrl.device,
1690                              "%s failed with error code %d\n", __func__, ret);
1691         }
1692         return ret;
1693 }
1694
1695 static int nvme_rdma_post_recv(struct nvme_rdma_queue *queue,
1696                 struct nvme_rdma_qe *qe)
1697 {
1698         struct ib_recv_wr wr;
1699         struct ib_sge list;
1700         int ret;
1701
1702         list.addr   = qe->dma;
1703         list.length = sizeof(struct nvme_completion);
1704         list.lkey   = queue->device->pd->local_dma_lkey;
1705
1706         qe->cqe.done = nvme_rdma_recv_done;
1707
1708         wr.next     = NULL;
1709         wr.wr_cqe   = &qe->cqe;
1710         wr.sg_list  = &list;
1711         wr.num_sge  = 1;
1712
1713         ret = ib_post_recv(queue->qp, &wr, NULL);
1714         if (unlikely(ret)) {
1715                 dev_err(queue->ctrl->ctrl.device,
1716                         "%s failed with error code %d\n", __func__, ret);
1717         }
1718         return ret;
1719 }
1720
1721 static struct blk_mq_tags *nvme_rdma_tagset(struct nvme_rdma_queue *queue)
1722 {
1723         u32 queue_idx = nvme_rdma_queue_idx(queue);
1724
1725         if (queue_idx == 0)
1726                 return queue->ctrl->admin_tag_set.tags[queue_idx];
1727         return queue->ctrl->tag_set.tags[queue_idx - 1];
1728 }
1729
1730 static void nvme_rdma_async_done(struct ib_cq *cq, struct ib_wc *wc)
1731 {
1732         if (unlikely(wc->status != IB_WC_SUCCESS))
1733                 nvme_rdma_wr_error(cq, wc, "ASYNC");
1734 }
1735
1736 static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg)
1737 {
1738         struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(arg);
1739         struct nvme_rdma_queue *queue = &ctrl->queues[0];
1740         struct ib_device *dev = queue->device->dev;
1741         struct nvme_rdma_qe *sqe = &ctrl->async_event_sqe;
1742         struct nvme_command *cmd = sqe->data;
1743         struct ib_sge sge;
1744         int ret;
1745
1746         ib_dma_sync_single_for_cpu(dev, sqe->dma, sizeof(*cmd), DMA_TO_DEVICE);
1747
1748         memset(cmd, 0, sizeof(*cmd));
1749         cmd->common.opcode = nvme_admin_async_event;
1750         cmd->common.command_id = NVME_AQ_BLK_MQ_DEPTH;
1751         cmd->common.flags |= NVME_CMD_SGL_METABUF;
1752         nvme_rdma_set_sg_null(cmd);
1753
1754         sqe->cqe.done = nvme_rdma_async_done;
1755
1756         ib_dma_sync_single_for_device(dev, sqe->dma, sizeof(*cmd),
1757                         DMA_TO_DEVICE);
1758
1759         ret = nvme_rdma_post_send(queue, sqe, &sge, 1, NULL);
1760         WARN_ON_ONCE(ret);
1761 }
1762
1763 static void nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue,
1764                 struct nvme_completion *cqe, struct ib_wc *wc)
1765 {
1766         struct request *rq;
1767         struct nvme_rdma_request *req;
1768
1769         rq = nvme_find_rq(nvme_rdma_tagset(queue), cqe->command_id);
1770         if (!rq) {
1771                 dev_err(queue->ctrl->ctrl.device,
1772                         "got bad command_id %#x on QP %#x\n",
1773                         cqe->command_id, queue->qp->qp_num);
1774                 nvme_rdma_error_recovery(queue->ctrl);
1775                 return;
1776         }
1777         req = blk_mq_rq_to_pdu(rq);
1778
1779         req->status = cqe->status;
1780         req->result = cqe->result;
1781
1782         if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
1783                 if (unlikely(!req->mr ||
1784                              wc->ex.invalidate_rkey != req->mr->rkey)) {
1785                         dev_err(queue->ctrl->ctrl.device,
1786                                 "Bogus remote invalidation for rkey %#x\n",
1787                                 req->mr ? req->mr->rkey : 0);
1788                         nvme_rdma_error_recovery(queue->ctrl);
1789                 }
1790         } else if (req->mr) {
1791                 int ret;
1792
1793                 ret = nvme_rdma_inv_rkey(queue, req);
1794                 if (unlikely(ret < 0)) {
1795                         dev_err(queue->ctrl->ctrl.device,
1796                                 "Queueing INV WR for rkey %#x failed (%d)\n",
1797                                 req->mr->rkey, ret);
1798                         nvme_rdma_error_recovery(queue->ctrl);
1799                 }
1800                 /* the local invalidation completion will end the request */
1801                 return;
1802         }
1803
1804         nvme_rdma_end_request(req);
1805 }
1806
1807 static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1808 {
1809         struct nvme_rdma_qe *qe =
1810                 container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
1811         struct nvme_rdma_queue *queue = wc->qp->qp_context;
1812         struct ib_device *ibdev = queue->device->dev;
1813         struct nvme_completion *cqe = qe->data;
1814         const size_t len = sizeof(struct nvme_completion);
1815
1816         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1817                 nvme_rdma_wr_error(cq, wc, "RECV");
1818                 return;
1819         }
1820
1821         /* sanity checking for received data length */
1822         if (unlikely(wc->byte_len < len)) {
1823                 dev_err(queue->ctrl->ctrl.device,
1824                         "Unexpected nvme completion length(%d)\n", wc->byte_len);
1825                 nvme_rdma_error_recovery(queue->ctrl);
1826                 return;
1827         }
1828
1829         ib_dma_sync_single_for_cpu(ibdev, qe->dma, len, DMA_FROM_DEVICE);
1830         /*
1831          * AEN requests are special as they don't time out and can
1832          * survive any kind of queue freeze and often don't respond to
1833          * aborts.  We don't even bother to allocate a struct request
1834          * for them but rather special case them here.
1835          */
1836         if (unlikely(nvme_is_aen_req(nvme_rdma_queue_idx(queue),
1837                                      cqe->command_id)))
1838                 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
1839                                 &cqe->result);
1840         else
1841                 nvme_rdma_process_nvme_rsp(queue, cqe, wc);
1842         ib_dma_sync_single_for_device(ibdev, qe->dma, len, DMA_FROM_DEVICE);
1843
1844         nvme_rdma_post_recv(queue, qe);
1845 }
1846
1847 static int nvme_rdma_conn_established(struct nvme_rdma_queue *queue)
1848 {
1849         int ret, i;
1850
1851         for (i = 0; i < queue->queue_size; i++) {
1852                 ret = nvme_rdma_post_recv(queue, &queue->rsp_ring[i]);
1853                 if (ret)
1854                         return ret;
1855         }
1856
1857         return 0;
1858 }
1859
1860 static int nvme_rdma_conn_rejected(struct nvme_rdma_queue *queue,
1861                 struct rdma_cm_event *ev)
1862 {
1863         struct rdma_cm_id *cm_id = queue->cm_id;
1864         int status = ev->status;
1865         const char *rej_msg;
1866         const struct nvme_rdma_cm_rej *rej_data;
1867         u8 rej_data_len;
1868
1869         rej_msg = rdma_reject_msg(cm_id, status);
1870         rej_data = rdma_consumer_reject_data(cm_id, ev, &rej_data_len);
1871
1872         if (rej_data && rej_data_len >= sizeof(u16)) {
1873                 u16 sts = le16_to_cpu(rej_data->sts);
1874
1875                 dev_err(queue->ctrl->ctrl.device,
1876                       "Connect rejected: status %d (%s) nvme status %d (%s).\n",
1877                       status, rej_msg, sts, nvme_rdma_cm_msg(sts));
1878         } else {
1879                 dev_err(queue->ctrl->ctrl.device,
1880                         "Connect rejected: status %d (%s).\n", status, rej_msg);
1881         }
1882
1883         return -ECONNRESET;
1884 }
1885
1886 static int nvme_rdma_addr_resolved(struct nvme_rdma_queue *queue)
1887 {
1888         struct nvme_ctrl *ctrl = &queue->ctrl->ctrl;
1889         int ret;
1890
1891         ret = nvme_rdma_create_queue_ib(queue);
1892         if (ret)
1893                 return ret;
1894
1895         if (ctrl->opts->tos >= 0)
1896                 rdma_set_service_type(queue->cm_id, ctrl->opts->tos);
1897         ret = rdma_resolve_route(queue->cm_id, NVME_RDMA_CONNECT_TIMEOUT_MS);
1898         if (ret) {
1899                 dev_err(ctrl->device, "rdma_resolve_route failed (%d).\n",
1900                         queue->cm_error);
1901                 goto out_destroy_queue;
1902         }
1903
1904         return 0;
1905
1906 out_destroy_queue:
1907         nvme_rdma_destroy_queue_ib(queue);
1908         return ret;
1909 }
1910
1911 static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue)
1912 {
1913         struct nvme_rdma_ctrl *ctrl = queue->ctrl;
1914         struct rdma_conn_param param = { };
1915         struct nvme_rdma_cm_req priv = { };
1916         int ret;
1917
1918         param.qp_num = queue->qp->qp_num;
1919         param.flow_control = 1;
1920
1921         param.responder_resources = queue->device->dev->attrs.max_qp_rd_atom;
1922         /* maximum retry count */
1923         param.retry_count = 7;
1924         param.rnr_retry_count = 7;
1925         param.private_data = &priv;
1926         param.private_data_len = sizeof(priv);
1927
1928         priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1929         priv.qid = cpu_to_le16(nvme_rdma_queue_idx(queue));
1930         /*
1931          * set the admin queue depth to the minimum size
1932          * specified by the Fabrics standard.
1933          */
1934         if (priv.qid == 0) {
1935                 priv.hrqsize = cpu_to_le16(NVME_AQ_DEPTH);
1936                 priv.hsqsize = cpu_to_le16(NVME_AQ_DEPTH - 1);
1937         } else {
1938                 /*
1939                  * current interpretation of the fabrics spec
1940                  * is at minimum you make hrqsize sqsize+1, or a
1941                  * 1's based representation of sqsize.
1942                  */
1943                 priv.hrqsize = cpu_to_le16(queue->queue_size);
1944                 priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize);
1945         }
1946
1947         ret = rdma_connect_locked(queue->cm_id, &param);
1948         if (ret) {
1949                 dev_err(ctrl->ctrl.device,
1950                         "rdma_connect_locked failed (%d).\n", ret);
1951                 return ret;
1952         }
1953
1954         return 0;
1955 }
1956
1957 static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
1958                 struct rdma_cm_event *ev)
1959 {
1960         struct nvme_rdma_queue *queue = cm_id->context;
1961         int cm_error = 0;
1962
1963         dev_dbg(queue->ctrl->ctrl.device, "%s (%d): status %d id %p\n",
1964                 rdma_event_msg(ev->event), ev->event,
1965                 ev->status, cm_id);
1966
1967         switch (ev->event) {
1968         case RDMA_CM_EVENT_ADDR_RESOLVED:
1969                 cm_error = nvme_rdma_addr_resolved(queue);
1970                 break;
1971         case RDMA_CM_EVENT_ROUTE_RESOLVED:
1972                 cm_error = nvme_rdma_route_resolved(queue);
1973                 break;
1974         case RDMA_CM_EVENT_ESTABLISHED:
1975                 queue->cm_error = nvme_rdma_conn_established(queue);
1976                 /* complete cm_done regardless of success/failure */
1977                 complete(&queue->cm_done);
1978                 return 0;
1979         case RDMA_CM_EVENT_REJECTED:
1980                 cm_error = nvme_rdma_conn_rejected(queue, ev);
1981                 break;
1982         case RDMA_CM_EVENT_ROUTE_ERROR:
1983         case RDMA_CM_EVENT_CONNECT_ERROR:
1984         case RDMA_CM_EVENT_UNREACHABLE:
1985         case RDMA_CM_EVENT_ADDR_ERROR:
1986                 dev_dbg(queue->ctrl->ctrl.device,
1987                         "CM error event %d\n", ev->event);
1988                 cm_error = -ECONNRESET;
1989                 break;
1990         case RDMA_CM_EVENT_DISCONNECTED:
1991         case RDMA_CM_EVENT_ADDR_CHANGE:
1992         case RDMA_CM_EVENT_TIMEWAIT_EXIT:
1993                 dev_dbg(queue->ctrl->ctrl.device,
1994                         "disconnect received - connection closed\n");
1995                 nvme_rdma_error_recovery(queue->ctrl);
1996                 break;
1997         case RDMA_CM_EVENT_DEVICE_REMOVAL:
1998                 /* device removal is handled via the ib_client API */
1999                 break;
2000         default:
2001                 dev_err(queue->ctrl->ctrl.device,
2002                         "Unexpected RDMA CM event (%d)\n", ev->event);
2003                 nvme_rdma_error_recovery(queue->ctrl);
2004                 break;
2005         }
2006
2007         if (cm_error) {
2008                 queue->cm_error = cm_error;
2009                 complete(&queue->cm_done);
2010         }
2011
2012         return 0;
2013 }
2014
2015 static void nvme_rdma_complete_timed_out(struct request *rq)
2016 {
2017         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
2018         struct nvme_rdma_queue *queue = req->queue;
2019
2020         nvme_rdma_stop_queue(queue);
2021         nvmf_complete_timed_out_request(rq);
2022 }
2023
2024 static enum blk_eh_timer_return
2025 nvme_rdma_timeout(struct request *rq, bool reserved)
2026 {
2027         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
2028         struct nvme_rdma_queue *queue = req->queue;
2029         struct nvme_rdma_ctrl *ctrl = queue->ctrl;
2030
2031         dev_warn(ctrl->ctrl.device, "I/O %d QID %d timeout\n",
2032                  rq->tag, nvme_rdma_queue_idx(queue));
2033
2034         if (ctrl->ctrl.state != NVME_CTRL_LIVE) {
2035                 /*
2036                  * If we are resetting, connecting or deleting we should
2037                  * complete immediately because we may block controller
2038                  * teardown or setup sequence
2039                  * - ctrl disable/shutdown fabrics requests
2040                  * - connect requests
2041                  * - initialization admin requests
2042                  * - I/O requests that entered after unquiescing and
2043                  *   the controller stopped responding
2044                  *
2045                  * All other requests should be cancelled by the error
2046                  * recovery work, so it's fine that we fail it here.
2047                  */
2048                 nvme_rdma_complete_timed_out(rq);
2049                 return BLK_EH_DONE;
2050         }
2051
2052         /*
2053          * LIVE state should trigger the normal error recovery which will
2054          * handle completing this request.
2055          */
2056         nvme_rdma_error_recovery(ctrl);
2057         return BLK_EH_RESET_TIMER;
2058 }
2059
2060 static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
2061                 const struct blk_mq_queue_data *bd)
2062 {
2063         struct nvme_ns *ns = hctx->queue->queuedata;
2064         struct nvme_rdma_queue *queue = hctx->driver_data;
2065         struct request *rq = bd->rq;
2066         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
2067         struct nvme_rdma_qe *sqe = &req->sqe;
2068         struct nvme_command *c = nvme_req(rq)->cmd;
2069         struct ib_device *dev;
2070         bool queue_ready = test_bit(NVME_RDMA_Q_LIVE, &queue->flags);
2071         blk_status_t ret;
2072         int err;
2073
2074         WARN_ON_ONCE(rq->tag < 0);
2075
2076         if (!nvme_check_ready(&queue->ctrl->ctrl, rq, queue_ready))
2077                 return nvme_fail_nonready_command(&queue->ctrl->ctrl, rq);
2078
2079         dev = queue->device->dev;
2080
2081         req->sqe.dma = ib_dma_map_single(dev, req->sqe.data,
2082                                          sizeof(struct nvme_command),
2083                                          DMA_TO_DEVICE);
2084         err = ib_dma_mapping_error(dev, req->sqe.dma);
2085         if (unlikely(err))
2086                 return BLK_STS_RESOURCE;
2087
2088         ib_dma_sync_single_for_cpu(dev, sqe->dma,
2089                         sizeof(struct nvme_command), DMA_TO_DEVICE);
2090
2091         ret = nvme_setup_cmd(ns, rq);
2092         if (ret)
2093                 goto unmap_qe;
2094
2095         blk_mq_start_request(rq);
2096
2097         if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) &&
2098             queue->pi_support &&
2099             (c->common.opcode == nvme_cmd_write ||
2100              c->common.opcode == nvme_cmd_read) &&
2101             nvme_ns_has_pi(ns))
2102                 req->use_sig_mr = true;
2103         else
2104                 req->use_sig_mr = false;
2105
2106         err = nvme_rdma_map_data(queue, rq, c);
2107         if (unlikely(err < 0)) {
2108                 dev_err(queue->ctrl->ctrl.device,
2109                              "Failed to map data (%d)\n", err);
2110                 goto err;
2111         }
2112
2113         sqe->cqe.done = nvme_rdma_send_done;
2114
2115         ib_dma_sync_single_for_device(dev, sqe->dma,
2116                         sizeof(struct nvme_command), DMA_TO_DEVICE);
2117
2118         err = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge,
2119                         req->mr ? &req->reg_wr.wr : NULL);
2120         if (unlikely(err))
2121                 goto err_unmap;
2122
2123         return BLK_STS_OK;
2124
2125 err_unmap:
2126         nvme_rdma_unmap_data(queue, rq);
2127 err:
2128         if (err == -EIO)
2129                 ret = nvme_host_path_error(rq);
2130         else if (err == -ENOMEM || err == -EAGAIN)
2131                 ret = BLK_STS_RESOURCE;
2132         else
2133                 ret = BLK_STS_IOERR;
2134         nvme_cleanup_cmd(rq);
2135 unmap_qe:
2136         ib_dma_unmap_single(dev, req->sqe.dma, sizeof(struct nvme_command),
2137                             DMA_TO_DEVICE);
2138         return ret;
2139 }
2140
2141 static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob)
2142 {
2143         struct nvme_rdma_queue *queue = hctx->driver_data;
2144
2145         return ib_process_cq_direct(queue->ib_cq, -1);
2146 }
2147
2148 static void nvme_rdma_check_pi_status(struct nvme_rdma_request *req)
2149 {
2150         struct request *rq = blk_mq_rq_from_pdu(req);
2151         struct ib_mr_status mr_status;
2152         int ret;
2153
2154         ret = ib_check_mr_status(req->mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
2155         if (ret) {
2156                 pr_err("ib_check_mr_status failed, ret %d\n", ret);
2157                 nvme_req(rq)->status = NVME_SC_INVALID_PI;
2158                 return;
2159         }
2160
2161         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
2162                 switch (mr_status.sig_err.err_type) {
2163                 case IB_SIG_BAD_GUARD:
2164                         nvme_req(rq)->status = NVME_SC_GUARD_CHECK;
2165                         break;
2166                 case IB_SIG_BAD_REFTAG:
2167                         nvme_req(rq)->status = NVME_SC_REFTAG_CHECK;
2168                         break;
2169                 case IB_SIG_BAD_APPTAG:
2170                         nvme_req(rq)->status = NVME_SC_APPTAG_CHECK;
2171                         break;
2172                 }
2173                 pr_err("PI error found type %d expected 0x%x vs actual 0x%x\n",
2174                        mr_status.sig_err.err_type, mr_status.sig_err.expected,
2175                        mr_status.sig_err.actual);
2176         }
2177 }
2178
2179 static void nvme_rdma_complete_rq(struct request *rq)
2180 {
2181         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
2182         struct nvme_rdma_queue *queue = req->queue;
2183         struct ib_device *ibdev = queue->device->dev;
2184
2185         if (req->use_sig_mr)
2186                 nvme_rdma_check_pi_status(req);
2187
2188         nvme_rdma_unmap_data(queue, rq);
2189         ib_dma_unmap_single(ibdev, req->sqe.dma, sizeof(struct nvme_command),
2190                             DMA_TO_DEVICE);
2191         nvme_complete_rq(rq);
2192 }
2193
2194 static int nvme_rdma_map_queues(struct blk_mq_tag_set *set)
2195 {
2196         struct nvme_rdma_ctrl *ctrl = set->driver_data;
2197         struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
2198
2199         if (opts->nr_write_queues && ctrl->io_queues[HCTX_TYPE_READ]) {
2200                 /* separate read/write queues */
2201                 set->map[HCTX_TYPE_DEFAULT].nr_queues =
2202                         ctrl->io_queues[HCTX_TYPE_DEFAULT];
2203                 set->map[HCTX_TYPE_DEFAULT].queue_offset = 0;
2204                 set->map[HCTX_TYPE_READ].nr_queues =
2205                         ctrl->io_queues[HCTX_TYPE_READ];
2206                 set->map[HCTX_TYPE_READ].queue_offset =
2207                         ctrl->io_queues[HCTX_TYPE_DEFAULT];
2208         } else {
2209                 /* shared read/write queues */
2210                 set->map[HCTX_TYPE_DEFAULT].nr_queues =
2211                         ctrl->io_queues[HCTX_TYPE_DEFAULT];
2212                 set->map[HCTX_TYPE_DEFAULT].queue_offset = 0;
2213                 set->map[HCTX_TYPE_READ].nr_queues =
2214                         ctrl->io_queues[HCTX_TYPE_DEFAULT];
2215                 set->map[HCTX_TYPE_READ].queue_offset = 0;
2216         }
2217         blk_mq_rdma_map_queues(&set->map[HCTX_TYPE_DEFAULT],
2218                         ctrl->device->dev, 0);
2219         blk_mq_rdma_map_queues(&set->map[HCTX_TYPE_READ],
2220                         ctrl->device->dev, 0);
2221
2222         if (opts->nr_poll_queues && ctrl->io_queues[HCTX_TYPE_POLL]) {
2223                 /* map dedicated poll queues only if we have queues left */
2224                 set->map[HCTX_TYPE_POLL].nr_queues =
2225                                 ctrl->io_queues[HCTX_TYPE_POLL];
2226                 set->map[HCTX_TYPE_POLL].queue_offset =
2227                         ctrl->io_queues[HCTX_TYPE_DEFAULT] +
2228                         ctrl->io_queues[HCTX_TYPE_READ];
2229                 blk_mq_map_queues(&set->map[HCTX_TYPE_POLL]);
2230         }
2231
2232         dev_info(ctrl->ctrl.device,
2233                 "mapped %d/%d/%d default/read/poll queues.\n",
2234                 ctrl->io_queues[HCTX_TYPE_DEFAULT],
2235                 ctrl->io_queues[HCTX_TYPE_READ],
2236                 ctrl->io_queues[HCTX_TYPE_POLL]);
2237
2238         return 0;
2239 }
2240
2241 static const struct blk_mq_ops nvme_rdma_mq_ops = {
2242         .queue_rq       = nvme_rdma_queue_rq,
2243         .complete       = nvme_rdma_complete_rq,
2244         .init_request   = nvme_rdma_init_request,
2245         .exit_request   = nvme_rdma_exit_request,
2246         .init_hctx      = nvme_rdma_init_hctx,
2247         .timeout        = nvme_rdma_timeout,
2248         .map_queues     = nvme_rdma_map_queues,
2249         .poll           = nvme_rdma_poll,
2250 };
2251
2252 static const struct blk_mq_ops nvme_rdma_admin_mq_ops = {
2253         .queue_rq       = nvme_rdma_queue_rq,
2254         .complete       = nvme_rdma_complete_rq,
2255         .init_request   = nvme_rdma_init_request,
2256         .exit_request   = nvme_rdma_exit_request,
2257         .init_hctx      = nvme_rdma_init_admin_hctx,
2258         .timeout        = nvme_rdma_timeout,
2259 };
2260
2261 static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
2262 {
2263         nvme_rdma_teardown_io_queues(ctrl, shutdown);
2264         nvme_stop_admin_queue(&ctrl->ctrl);
2265         if (shutdown)
2266                 nvme_shutdown_ctrl(&ctrl->ctrl);
2267         else
2268                 nvme_disable_ctrl(&ctrl->ctrl);
2269         nvme_rdma_teardown_admin_queue(ctrl, shutdown);
2270 }
2271
2272 static void nvme_rdma_delete_ctrl(struct nvme_ctrl *ctrl)
2273 {
2274         nvme_rdma_shutdown_ctrl(to_rdma_ctrl(ctrl), true);
2275 }
2276
2277 static void nvme_rdma_reset_ctrl_work(struct work_struct *work)
2278 {
2279         struct nvme_rdma_ctrl *ctrl =
2280                 container_of(work, struct nvme_rdma_ctrl, ctrl.reset_work);
2281
2282         nvme_stop_ctrl(&ctrl->ctrl);
2283         nvme_rdma_shutdown_ctrl(ctrl, false);
2284
2285         if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
2286                 /* state change failure should never happen */
2287                 WARN_ON_ONCE(1);
2288                 return;
2289         }
2290
2291         if (nvme_rdma_setup_ctrl(ctrl, false))
2292                 goto out_fail;
2293
2294         return;
2295
2296 out_fail:
2297         ++ctrl->ctrl.nr_reconnects;
2298         nvme_rdma_reconnect_or_remove(ctrl);
2299 }
2300
2301 static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {
2302         .name                   = "rdma",
2303         .module                 = THIS_MODULE,
2304         .flags                  = NVME_F_FABRICS | NVME_F_METADATA_SUPPORTED,
2305         .reg_read32             = nvmf_reg_read32,
2306         .reg_read64             = nvmf_reg_read64,
2307         .reg_write32            = nvmf_reg_write32,
2308         .free_ctrl              = nvme_rdma_free_ctrl,
2309         .submit_async_event     = nvme_rdma_submit_async_event,
2310         .delete_ctrl            = nvme_rdma_delete_ctrl,
2311         .get_address            = nvmf_get_address,
2312         .stop_ctrl              = nvme_rdma_stop_ctrl,
2313 };
2314
2315 /*
2316  * Fails a connection request if it matches an existing controller
2317  * (association) with the same tuple:
2318  * <Host NQN, Host ID, local address, remote address, remote port, SUBSYS NQN>
2319  *
2320  * if local address is not specified in the request, it will match an
2321  * existing controller with all the other parameters the same and no
2322  * local port address specified as well.
2323  *
2324  * The ports don't need to be compared as they are intrinsically
2325  * already matched by the port pointers supplied.
2326  */
2327 static bool
2328 nvme_rdma_existing_controller(struct nvmf_ctrl_options *opts)
2329 {
2330         struct nvme_rdma_ctrl *ctrl;
2331         bool found = false;
2332
2333         mutex_lock(&nvme_rdma_ctrl_mutex);
2334         list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
2335                 found = nvmf_ip_options_match(&ctrl->ctrl, opts);
2336                 if (found)
2337                         break;
2338         }
2339         mutex_unlock(&nvme_rdma_ctrl_mutex);
2340
2341         return found;
2342 }
2343
2344 static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
2345                 struct nvmf_ctrl_options *opts)
2346 {
2347         struct nvme_rdma_ctrl *ctrl;
2348         int ret;
2349         bool changed;
2350
2351         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
2352         if (!ctrl)
2353                 return ERR_PTR(-ENOMEM);
2354         ctrl->ctrl.opts = opts;
2355         INIT_LIST_HEAD(&ctrl->list);
2356
2357         if (!(opts->mask & NVMF_OPT_TRSVCID)) {
2358                 opts->trsvcid =
2359                         kstrdup(__stringify(NVME_RDMA_IP_PORT), GFP_KERNEL);
2360                 if (!opts->trsvcid) {
2361                         ret = -ENOMEM;
2362                         goto out_free_ctrl;
2363                 }
2364                 opts->mask |= NVMF_OPT_TRSVCID;
2365         }
2366
2367         ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
2368                         opts->traddr, opts->trsvcid, &ctrl->addr);
2369         if (ret) {
2370                 pr_err("malformed address passed: %s:%s\n",
2371                         opts->traddr, opts->trsvcid);
2372                 goto out_free_ctrl;
2373         }
2374
2375         if (opts->mask & NVMF_OPT_HOST_TRADDR) {
2376                 ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
2377                         opts->host_traddr, NULL, &ctrl->src_addr);
2378                 if (ret) {
2379                         pr_err("malformed src address passed: %s\n",
2380                                opts->host_traddr);
2381                         goto out_free_ctrl;
2382                 }
2383         }
2384
2385         if (!opts->duplicate_connect && nvme_rdma_existing_controller(opts)) {
2386                 ret = -EALREADY;
2387                 goto out_free_ctrl;
2388         }
2389
2390         INIT_DELAYED_WORK(&ctrl->reconnect_work,
2391                         nvme_rdma_reconnect_ctrl_work);
2392         INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work);
2393         INIT_WORK(&ctrl->ctrl.reset_work, nvme_rdma_reset_ctrl_work);
2394
2395         ctrl->ctrl.queue_count = opts->nr_io_queues + opts->nr_write_queues +
2396                                 opts->nr_poll_queues + 1;
2397         ctrl->ctrl.sqsize = opts->queue_size - 1;
2398         ctrl->ctrl.kato = opts->kato;
2399
2400         ret = -ENOMEM;
2401         ctrl->queues = kcalloc(ctrl->ctrl.queue_count, sizeof(*ctrl->queues),
2402                                 GFP_KERNEL);
2403         if (!ctrl->queues)
2404                 goto out_free_ctrl;
2405
2406         ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops,
2407                                 0 /* no quirks, we're perfect! */);
2408         if (ret)
2409                 goto out_kfree_queues;
2410
2411         changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING);
2412         WARN_ON_ONCE(!changed);
2413
2414         ret = nvme_rdma_setup_ctrl(ctrl, true);
2415         if (ret)
2416                 goto out_uninit_ctrl;
2417
2418         dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISpcs\n",
2419                 nvmf_ctrl_subsysnqn(&ctrl->ctrl), &ctrl->addr);
2420
2421         mutex_lock(&nvme_rdma_ctrl_mutex);
2422         list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list);
2423         mutex_unlock(&nvme_rdma_ctrl_mutex);
2424
2425         return &ctrl->ctrl;
2426
2427 out_uninit_ctrl:
2428         nvme_uninit_ctrl(&ctrl->ctrl);
2429         nvme_put_ctrl(&ctrl->ctrl);
2430         if (ret > 0)
2431                 ret = -EIO;
2432         return ERR_PTR(ret);
2433 out_kfree_queues:
2434         kfree(ctrl->queues);
2435 out_free_ctrl:
2436         kfree(ctrl);
2437         return ERR_PTR(ret);
2438 }
2439
2440 static struct nvmf_transport_ops nvme_rdma_transport = {
2441         .name           = "rdma",
2442         .module         = THIS_MODULE,
2443         .required_opts  = NVMF_OPT_TRADDR,
2444         .allowed_opts   = NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY |
2445                           NVMF_OPT_HOST_TRADDR | NVMF_OPT_CTRL_LOSS_TMO |
2446                           NVMF_OPT_NR_WRITE_QUEUES | NVMF_OPT_NR_POLL_QUEUES |
2447                           NVMF_OPT_TOS,
2448         .create_ctrl    = nvme_rdma_create_ctrl,
2449 };
2450
2451 static void nvme_rdma_remove_one(struct ib_device *ib_device, void *client_data)
2452 {
2453         struct nvme_rdma_ctrl *ctrl;
2454         struct nvme_rdma_device *ndev;
2455         bool found = false;
2456
2457         mutex_lock(&device_list_mutex);
2458         list_for_each_entry(ndev, &device_list, entry) {
2459                 if (ndev->dev == ib_device) {
2460                         found = true;
2461                         break;
2462                 }
2463         }
2464         mutex_unlock(&device_list_mutex);
2465
2466         if (!found)
2467                 return;
2468
2469         /* Delete all controllers using this device */
2470         mutex_lock(&nvme_rdma_ctrl_mutex);
2471         list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
2472                 if (ctrl->device->dev != ib_device)
2473                         continue;
2474                 nvme_delete_ctrl(&ctrl->ctrl);
2475         }
2476         mutex_unlock(&nvme_rdma_ctrl_mutex);
2477
2478         flush_workqueue(nvme_delete_wq);
2479 }
2480
2481 static struct ib_client nvme_rdma_ib_client = {
2482         .name   = "nvme_rdma",
2483         .remove = nvme_rdma_remove_one
2484 };
2485
2486 static int __init nvme_rdma_init_module(void)
2487 {
2488         int ret;
2489
2490         ret = ib_register_client(&nvme_rdma_ib_client);
2491         if (ret)
2492                 return ret;
2493
2494         ret = nvmf_register_transport(&nvme_rdma_transport);
2495         if (ret)
2496                 goto err_unreg_client;
2497
2498         return 0;
2499
2500 err_unreg_client:
2501         ib_unregister_client(&nvme_rdma_ib_client);
2502         return ret;
2503 }
2504
2505 static void __exit nvme_rdma_cleanup_module(void)
2506 {
2507         struct nvme_rdma_ctrl *ctrl;
2508
2509         nvmf_unregister_transport(&nvme_rdma_transport);
2510         ib_unregister_client(&nvme_rdma_ib_client);
2511
2512         mutex_lock(&nvme_rdma_ctrl_mutex);
2513         list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list)
2514                 nvme_delete_ctrl(&ctrl->ctrl);
2515         mutex_unlock(&nvme_rdma_ctrl_mutex);
2516         flush_workqueue(nvme_delete_wq);
2517 }
2518
2519 module_init(nvme_rdma_init_module);
2520 module_exit(nvme_rdma_cleanup_module);
2521
2522 MODULE_LICENSE("GPL v2");