drivers/nvme/host/rdma.c

   1 /*
   2  * NVMe over Fabrics RDMA host code.
   3  * Copyright (c) 2015-2016 HGST, a Western Digital Company.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  */
  14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/slab.h>
  18 #include <rdma/mr_pool.h>
  19 #include <linux/err.h>
  20 #include <linux/string.h>
  21 #include <linux/atomic.h>
  22 #include <linux/blk-mq.h>
  23 #include <linux/blk-mq-rdma.h>
  24 #include <linux/types.h>
  25 #include <linux/list.h>
  26 #include <linux/mutex.h>
  27 #include <linux/scatterlist.h>
  28 #include <linux/nvme.h>
  29 #include <asm/unaligned.h>
  30
  31 #include <rdma/ib_verbs.h>
  32 #include <rdma/rdma_cm.h>
  33 #include <linux/nvme-rdma.h>
  34
  35 #include "nvme.h"
  36 #include "fabrics.h"
  37
  38
  39 #define NVME_RDMA_CONNECT_TIMEOUT_MS    3000            /* 3 second */
  40
  41 #define NVME_RDMA_MAX_SEGMENTS          256
  42
  43 #define NVME_RDMA_MAX_INLINE_SEGMENTS   4
  44
  45 struct nvme_rdma_device {
  46         struct ib_device        *dev;
  47         struct ib_pd            *pd;
  48         struct kref             ref;
  49         struct list_head        entry;
  50         unsigned int            num_inline_segments;
  51 };
  52
  53 struct nvme_rdma_qe {
  54         struct ib_cqe           cqe;
  55         void                    *data;
  56         u64                     dma;
  57 };
  58
  59 struct nvme_rdma_queue;
  60 struct nvme_rdma_request {
  61         struct nvme_request     req;
  62         struct ib_mr            *mr;
  63         struct nvme_rdma_qe     sqe;
  64         union nvme_result       result;
  65         __le16                  status;
  66         refcount_t              ref;
  67         struct ib_sge           sge[1 + NVME_RDMA_MAX_INLINE_SEGMENTS];
  68         u32                     num_sge;
  69         int                     nents;
  70         struct ib_reg_wr        reg_wr;
  71         struct ib_cqe           reg_cqe;
  72         struct nvme_rdma_queue  *queue;
  73         struct sg_table         sg_table;
  74         struct scatterlist      first_sgl[];
  75 };
  76
  77 enum nvme_rdma_queue_flags {
  78         NVME_RDMA_Q_ALLOCATED           = 0,
  79         NVME_RDMA_Q_LIVE                = 1,
  80         NVME_RDMA_Q_TR_READY            = 2,
  81 };
  82
  83 struct nvme_rdma_queue {
  84         struct nvme_rdma_qe     *rsp_ring;
  85         int                     queue_size;
  86         size_t                  cmnd_capsule_len;
  87         struct nvme_rdma_ctrl   *ctrl;
  88         struct nvme_rdma_device *device;
  89         struct ib_cq            *ib_cq;
  90         struct ib_qp            *qp;
  91
  92         unsigned long           flags;
  93         struct rdma_cm_id       *cm_id;
  94         int                     cm_error;
  95         struct completion       cm_done;
  96 };
  97
  98 struct nvme_rdma_ctrl {
  99         /* read only in the hot path */
 100         struct nvme_rdma_queue  *queues;
 101
 102         /* other member variables */
 103         struct blk_mq_tag_set   tag_set;
 104         struct work_struct      err_work;
 105
 106         struct nvme_rdma_qe     async_event_sqe;
 107
 108         struct delayed_work     reconnect_work;
 109
 110         struct list_head        list;
 111
 112         struct blk_mq_tag_set   admin_tag_set;
 113         struct nvme_rdma_device *device;
 114
 115         u32                     max_fr_pages;
 116
 117         struct sockaddr_storage addr;
 118         struct sockaddr_storage src_addr;
 119
 120         struct nvme_ctrl        ctrl;
 121         bool                    use_inline_data;
 122 };
 123
 124 static inline struct nvme_rdma_ctrl *to_rdma_ctrl(struct nvme_ctrl *ctrl)
 125 {
 126         return container_of(ctrl, struct nvme_rdma_ctrl, ctrl);
 127 }
 128
 129 static LIST_HEAD(device_list);
 130 static DEFINE_MUTEX(device_list_mutex);
 131
 132 static LIST_HEAD(nvme_rdma_ctrl_list);
 133 static DEFINE_MUTEX(nvme_rdma_ctrl_mutex);
 134
 135 /*
 136  * Disabling this option makes small I/O goes faster, but is fundamentally
 137  * unsafe.  With it turned off we will have to register a global rkey that
 138  * allows read and write access to all physical memory.
 139  */
 140 static bool register_always = true;
 141 module_param(register_always, bool, 0444);
 142 MODULE_PARM_DESC(register_always,
 143          "Use memory registration even for contiguous memory regions");
 144
 145 static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
 146                 struct rdma_cm_event *event);
 147 static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
 148
 149 static const struct blk_mq_ops nvme_rdma_mq_ops;
 150 static const struct blk_mq_ops nvme_rdma_admin_mq_ops;
 151
 152 /* XXX: really should move to a generic header sooner or later.. */
 153 static inline void put_unaligned_le24(u32 val, u8 *p)
 154 {
 155         *p++ = val;
 156         *p++ = val >> 8;
 157         *p++ = val >> 16;
 158 }
 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 inline size_t nvme_rdma_inline_data_size(struct nvme_rdma_queue *queue)
 166 {
 167         return queue->cmnd_capsule_len - sizeof(struct nvme_command);
 168 }
 169
 170 static void nvme_rdma_free_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
 171                 size_t capsule_size, enum dma_data_direction dir)
 172 {
 173         ib_dma_unmap_single(ibdev, qe->dma, capsule_size, dir);
 174         kfree(qe->data);
 175 }
 176
 177 static int nvme_rdma_alloc_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
 178                 size_t capsule_size, enum dma_data_direction dir)
 179 {
 180         qe->data = kzalloc(capsule_size, GFP_KERNEL);
 181         if (!qe->data)
 182                 return -ENOMEM;
 183
 184         qe->dma = ib_dma_map_single(ibdev, qe->data, capsule_size, dir);
 185         if (ib_dma_mapping_error(ibdev, qe->dma)) {
 186                 kfree(qe->data);
 187                 return -ENOMEM;
 188         }
 189
 190         return 0;
 191 }
 192
 193 static void nvme_rdma_free_ring(struct ib_device *ibdev,
 194                 struct nvme_rdma_qe *ring, size_t ib_queue_size,
 195                 size_t capsule_size, enum dma_data_direction dir)
 196 {
 197         int i;
 198
 199         for (i = 0; i < ib_queue_size; i++)
 200                 nvme_rdma_free_qe(ibdev, &ring[i], capsule_size, dir);
 201         kfree(ring);
 202 }
 203
 204 static struct nvme_rdma_qe *nvme_rdma_alloc_ring(struct ib_device *ibdev,
 205                 size_t ib_queue_size, size_t capsule_size,
 206                 enum dma_data_direction dir)
 207 {
 208         struct nvme_rdma_qe *ring;
 209         int i;
 210
 211         ring = kcalloc(ib_queue_size, sizeof(struct nvme_rdma_qe), GFP_KERNEL);
 212         if (!ring)
 213                 return NULL;
 214
 215         for (i = 0; i < ib_queue_size; i++) {
 216                 if (nvme_rdma_alloc_qe(ibdev, &ring[i], capsule_size, dir))
 217                         goto out_free_ring;
 218         }
 219
 220         return ring;
 221
 222 out_free_ring:
 223         nvme_rdma_free_ring(ibdev, ring, i, capsule_size, dir);
 224         return NULL;
 225 }
 226
 227 static void nvme_rdma_qp_event(struct ib_event *event, void *context)
 228 {
 229         pr_debug("QP event %s (%d)\n",
 230                  ib_event_msg(event->event), event->event);
 231
 232 }
 233
 234 static int nvme_rdma_wait_for_cm(struct nvme_rdma_queue *queue)
 235 {
 236         wait_for_completion_interruptible_timeout(&queue->cm_done,
 237                         msecs_to_jiffies(NVME_RDMA_CONNECT_TIMEOUT_MS) + 1);
 238         return queue->cm_error;
 239 }
 240
 241 static int nvme_rdma_create_qp(struct nvme_rdma_queue *queue, const int factor)
 242 {
 243         struct nvme_rdma_device *dev = queue->device;
 244         struct ib_qp_init_attr init_attr;
 245         int ret;
 246
 247         memset(&init_attr, 0, sizeof(init_attr));
 248         init_attr.event_handler = nvme_rdma_qp_event;
 249         /* +1 for drain */
 250         init_attr.cap.max_send_wr = factor * queue->queue_size + 1;
 251         /* +1 for drain */
 252         init_attr.cap.max_recv_wr = queue->queue_size + 1;
 253         init_attr.cap.max_recv_sge = 1;
 254         init_attr.cap.max_send_sge = 1 + dev->num_inline_segments;
 255         init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 256         init_attr.qp_type = IB_QPT_RC;
 257         init_attr.send_cq = queue->ib_cq;
 258         init_attr.recv_cq = queue->ib_cq;
 259
 260         ret = rdma_create_qp(queue->cm_id, dev->pd, &init_attr);
 261
 262         queue->qp = queue->cm_id->qp;
 263         return ret;
 264 }
 265
 266 static void nvme_rdma_exit_request(struct blk_mq_tag_set *set,
 267                 struct request *rq, unsigned int hctx_idx)
 268 {
 269         struct nvme_rdma_ctrl *ctrl = set->driver_data;
 270         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
 271         int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0;
 272         struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];
 273         struct nvme_rdma_device *dev = queue->device;
 274
 275         nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command),
 276                         DMA_TO_DEVICE);
 277 }
 278
 279 static int nvme_rdma_init_request(struct blk_mq_tag_set *set,
 280                 struct request *rq, unsigned int hctx_idx,
 281                 unsigned int numa_node)
 282 {
 283         struct nvme_rdma_ctrl *ctrl = set->driver_data;
 284         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
 285         int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0;
 286         struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];
 287         struct nvme_rdma_device *dev = queue->device;
 288         struct ib_device *ibdev = dev->dev;
 289         int ret;
 290
 291         nvme_req(rq)->ctrl = &ctrl->ctrl;
 292         ret = nvme_rdma_alloc_qe(ibdev, &req->sqe, sizeof(struct nvme_command),
 293                         DMA_TO_DEVICE);
 294         if (ret)
 295                 return ret;
 296
 297         req->queue = queue;
 298
 299         return 0;
 300 }
 301
 302 static int nvme_rdma_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
 303                 unsigned int hctx_idx)
 304 {
 305         struct nvme_rdma_ctrl *ctrl = data;
 306         struct nvme_rdma_queue *queue = &ctrl->queues[hctx_idx + 1];
 307
 308         BUG_ON(hctx_idx >= ctrl->ctrl.queue_count);
 309
 310         hctx->driver_data = queue;
 311         return 0;
 312 }
 313
 314 static int nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
 315                 unsigned int hctx_idx)
 316 {
 317         struct nvme_rdma_ctrl *ctrl = data;
 318         struct nvme_rdma_queue *queue = &ctrl->queues[0];
 319
 320         BUG_ON(hctx_idx != 0);
 321
 322         hctx->driver_data = queue;
 323         return 0;
 324 }
 325
 326 static void nvme_rdma_free_dev(struct kref *ref)
 327 {
 328         struct nvme_rdma_device *ndev =
 329                 container_of(ref, struct nvme_rdma_device, ref);
 330
 331         mutex_lock(&device_list_mutex);
 332         list_del(&ndev->entry);
 333         mutex_unlock(&device_list_mutex);
 334
 335         ib_dealloc_pd(ndev->pd);
 336         kfree(ndev);
 337 }
 338
 339 static void nvme_rdma_dev_put(struct nvme_rdma_device *dev)
 340 {
 341         kref_put(&dev->ref, nvme_rdma_free_dev);
 342 }
 343
 344 static int nvme_rdma_dev_get(struct nvme_rdma_device *dev)
 345 {
 346         return kref_get_unless_zero(&dev->ref);
 347 }
 348
 349 static struct nvme_rdma_device *
 350 nvme_rdma_find_get_device(struct rdma_cm_id *cm_id)
 351 {
 352         struct nvme_rdma_device *ndev;
 353
 354         mutex_lock(&device_list_mutex);
 355         list_for_each_entry(ndev, &device_list, entry) {
 356                 if (ndev->dev->node_guid == cm_id->device->node_guid &&
 357                     nvme_rdma_dev_get(ndev))
 358                         goto out_unlock;
 359         }
 360
 361         ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
 362         if (!ndev)
 363                 goto out_err;
 364
 365         ndev->dev = cm_id->device;
 366         kref_init(&ndev->ref);
 367
 368         ndev->pd = ib_alloc_pd(ndev->dev,
 369                 register_always ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY);
 370         if (IS_ERR(ndev->pd))
 371                 goto out_free_dev;
 372
 373         if (!(ndev->dev->attrs.device_cap_flags &
 374               IB_DEVICE_MEM_MGT_EXTENSIONS)) {
 375                 dev_err(&ndev->dev->dev,
 376                         "Memory registrations not supported.\n");
 377                 goto out_free_pd;
 378         }
 379
 380         ndev->num_inline_segments = min(NVME_RDMA_MAX_INLINE_SEGMENTS,
 381                                         ndev->dev->attrs.max_send_sge - 1);
 382         list_add(&ndev->entry, &device_list);
 383 out_unlock:
 384         mutex_unlock(&device_list_mutex);
 385         return ndev;
 386
 387 out_free_pd:
 388         ib_dealloc_pd(ndev->pd);
 389 out_free_dev:
 390         kfree(ndev);
 391 out_err:
 392         mutex_unlock(&device_list_mutex);
 393         return NULL;
 394 }
 395
 396 static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue *queue)
 397 {
 398         struct nvme_rdma_device *dev;
 399         struct ib_device *ibdev;
 400
 401         if (!test_and_clear_bit(NVME_RDMA_Q_TR_READY, &queue->flags))
 402                 return;
 403
 404         dev = queue->device;
 405         ibdev = dev->dev;
 406
 407         ib_mr_pool_destroy(queue->qp, &queue->qp->rdma_mrs);
 408
 409         /*
 410          * The cm_id object might have been destroyed during RDMA connection
 411          * establishment error flow to avoid getting other cma events, thus
 412          * the destruction of the QP shouldn't use rdma_cm API.
 413          */
 414         ib_destroy_qp(queue->qp);
 415         ib_free_cq(queue->ib_cq);
 416
 417         nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,
 418                         sizeof(struct nvme_completion), DMA_FROM_DEVICE);
 419
 420         nvme_rdma_dev_put(dev);
 421 }
 422
 423 static int nvme_rdma_get_max_fr_pages(struct ib_device *ibdev)
 424 {
 425         return min_t(u32, NVME_RDMA_MAX_SEGMENTS,
 426                      ibdev->attrs.max_fast_reg_page_list_len);
 427 }
 428
 429 static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue *queue)
 430 {
 431         struct ib_device *ibdev;
 432         const int send_wr_factor = 3;                   /* MR, SEND, INV */
 433         const int cq_factor = send_wr_factor + 1;       /* + RECV */
 434         int comp_vector, idx = nvme_rdma_queue_idx(queue);
 435         int ret;
 436
 437         queue->device = nvme_rdma_find_get_device(queue->cm_id);
 438         if (!queue->device) {
 439                 dev_err(queue->cm_id->device->dev.parent,
 440                         "no client data found!\n");
 441                 return -ECONNREFUSED;
 442         }
 443         ibdev = queue->device->dev;
 444
 445         /*
 446          * Spread I/O queues completion vectors according their queue index.
 447          * Admin queues can always go on completion vector 0.
 448          */
 449         comp_vector = idx == 0 ? idx : idx - 1;
 450
 451         /* +1 for ib_stop_cq */
 452         queue->ib_cq = ib_alloc_cq(ibdev, queue,
 453                                 cq_factor * queue->queue_size + 1,
 454                                 comp_vector, IB_POLL_SOFTIRQ);
 455         if (IS_ERR(queue->ib_cq)) {
 456                 ret = PTR_ERR(queue->ib_cq);
 457                 goto out_put_dev;
 458         }
 459
 460         ret = nvme_rdma_create_qp(queue, send_wr_factor);
 461         if (ret)
 462                 goto out_destroy_ib_cq;
 463
 464         queue->rsp_ring = nvme_rdma_alloc_ring(ibdev, queue->queue_size,
 465                         sizeof(struct nvme_completion), DMA_FROM_DEVICE);
 466         if (!queue->rsp_ring) {
 467                 ret = -ENOMEM;
 468                 goto out_destroy_qp;
 469         }
 470
 471         ret = ib_mr_pool_init(queue->qp, &queue->qp->rdma_mrs,
 472                               queue->queue_size,
 473                               IB_MR_TYPE_MEM_REG,
 474                               nvme_rdma_get_max_fr_pages(ibdev));
 475         if (ret) {
 476                 dev_err(queue->ctrl->ctrl.device,
 477                         "failed to initialize MR pool sized %d for QID %d\n",
 478                         queue->queue_size, idx);
 479                 goto out_destroy_ring;
 480         }
 481
 482         set_bit(NVME_RDMA_Q_TR_READY, &queue->flags);
 483
 484         return 0;
 485
 486 out_destroy_ring:
 487         nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,
 488                             sizeof(struct nvme_completion), DMA_FROM_DEVICE);
 489 out_destroy_qp:
 490         rdma_destroy_qp(queue->cm_id);
 491 out_destroy_ib_cq:
 492         ib_free_cq(queue->ib_cq);
 493 out_put_dev:
 494         nvme_rdma_dev_put(queue->device);
 495         return ret;
 496 }
 497
 498 static int nvme_rdma_alloc_queue(struct nvme_rdma_ctrl *ctrl,
 499                 int idx, size_t queue_size)
 500 {
 501         struct nvme_rdma_queue *queue;
 502         struct sockaddr *src_addr = NULL;
 503         int ret;
 504
 505         queue = &ctrl->queues[idx];
 506         queue->ctrl = ctrl;
 507         init_completion(&queue->cm_done);
 508
 509         if (idx > 0)
 510                 queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16;
 511         else
 512                 queue->cmnd_capsule_len = sizeof(struct nvme_command);
 513
 514         queue->queue_size = queue_size;
 515
 516         queue->cm_id = rdma_create_id(&init_net, nvme_rdma_cm_handler, queue,
 517                         RDMA_PS_TCP, IB_QPT_RC);
 518         if (IS_ERR(queue->cm_id)) {
 519                 dev_info(ctrl->ctrl.device,
 520                         "failed to create CM ID: %ld\n", PTR_ERR(queue->cm_id));
 521                 return PTR_ERR(queue->cm_id);
 522         }
 523
 524         if (ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR)
 525                 src_addr = (struct sockaddr *)&ctrl->src_addr;
 526
 527         queue->cm_error = -ETIMEDOUT;
 528         ret = rdma_resolve_addr(queue->cm_id, src_addr,
 529                         (struct sockaddr *)&ctrl->addr,
 530                         NVME_RDMA_CONNECT_TIMEOUT_MS);
 531         if (ret) {
 532                 dev_info(ctrl->ctrl.device,
 533                         "rdma_resolve_addr failed (%d).\n", ret);
 534                 goto out_destroy_cm_id;
 535         }
 536
 537         ret = nvme_rdma_wait_for_cm(queue);
 538         if (ret) {
 539                 dev_info(ctrl->ctrl.device,
 540                         "rdma connection establishment failed (%d)\n", ret);
 541                 goto out_destroy_cm_id;
 542         }
 543
 544         set_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags);
 545
 546         return 0;
 547
 548 out_destroy_cm_id:
 549         rdma_destroy_id(queue->cm_id);
 550         nvme_rdma_destroy_queue_ib(queue);
 551         return ret;
 552 }
 553
 554 static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
 555 {
 556         if (!test_and_clear_bit(NVME_RDMA_Q_LIVE, &queue->flags))
 557                 return;
 558
 559         rdma_disconnect(queue->cm_id);
 560         ib_drain_qp(queue->qp);
 561 }
 562
 563 static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue)
 564 {
 565         if (!test_and_clear_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags))
 566                 return;
 567
 568         nvme_rdma_destroy_queue_ib(queue);
 569         rdma_destroy_id(queue->cm_id);
 570 }
 571
 572 static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl *ctrl)
 573 {
 574         int i;
 575
 576         for (i = 1; i < ctrl->ctrl.queue_count; i++)
 577                 nvme_rdma_free_queue(&ctrl->queues[i]);
 578 }
 579
 580 static void nvme_rdma_stop_io_queues(struct nvme_rdma_ctrl *ctrl)
 581 {
 582         int i;
 583
 584         for (i = 1; i < ctrl->ctrl.queue_count; i++)
 585                 nvme_rdma_stop_queue(&ctrl->queues[i]);
 586 }
 587
 588 static int nvme_rdma_start_queue(struct nvme_rdma_ctrl *ctrl, int idx)
 589 {
 590         int ret;
 591
 592         if (idx)
 593                 ret = nvmf_connect_io_queue(&ctrl->ctrl, idx);
 594         else
 595                 ret = nvmf_connect_admin_queue(&ctrl->ctrl);
 596
 597         if (!ret)
 598                 set_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[idx].flags);
 599         else
 600                 dev_info(ctrl->ctrl.device,
 601                         "failed to connect queue: %d ret=%d\n", idx, ret);
 602         return ret;
 603 }
 604
 605 static int nvme_rdma_start_io_queues(struct nvme_rdma_ctrl *ctrl)
 606 {
 607         int i, ret = 0;
 608
 609         for (i = 1; i < ctrl->ctrl.queue_count; i++) {
 610                 ret = nvme_rdma_start_queue(ctrl, i);
 611                 if (ret)
 612                         goto out_stop_queues;
 613         }
 614
 615         return 0;
 616
 617 out_stop_queues:
 618         for (i--; i >= 1; i--)
 619                 nvme_rdma_stop_queue(&ctrl->queues[i]);
 620         return ret;
 621 }
 622
 623 static int nvme_rdma_alloc_io_queues(struct nvme_rdma_ctrl *ctrl)
 624 {
 625         struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
 626         struct ib_device *ibdev = ctrl->device->dev;
 627         unsigned int nr_io_queues;
 628         int i, ret;
 629
 630         nr_io_queues = min(opts->nr_io_queues, num_online_cpus());
 631
 632         /*
 633          * we map queues according to the device irq vectors for
 634          * optimal locality so we don't need more queues than
 635          * completion vectors.
 636          */
 637         nr_io_queues = min_t(unsigned int, nr_io_queues,
 638                                 ibdev->num_comp_vectors);
 639
 640         ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);
 641         if (ret)
 642                 return ret;
 643
 644         ctrl->ctrl.queue_count = nr_io_queues + 1;
 645         if (ctrl->ctrl.queue_count < 2)
 646                 return 0;
 647
 648         dev_info(ctrl->ctrl.device,
 649                 "creating %d I/O queues.\n", nr_io_queues);
 650
 651         for (i = 1; i < ctrl->ctrl.queue_count; i++) {
 652                 ret = nvme_rdma_alloc_queue(ctrl, i,
 653                                 ctrl->ctrl.sqsize + 1);
 654                 if (ret)
 655                         goto out_free_queues;
 656         }
 657
 658         return 0;
 659
 660 out_free_queues:
 661         for (i--; i >= 1; i--)
 662                 nvme_rdma_free_queue(&ctrl->queues[i]);
 663
 664         return ret;
 665 }
 666
 667 static void nvme_rdma_free_tagset(struct nvme_ctrl *nctrl,
 668                 struct blk_mq_tag_set *set)
 669 {
 670         struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
 671
 672         blk_mq_free_tag_set(set);
 673         nvme_rdma_dev_put(ctrl->device);
 674 }
 675
 676 static struct blk_mq_tag_set *nvme_rdma_alloc_tagset(struct nvme_ctrl *nctrl,
 677                 bool admin)
 678 {
 679         struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
 680         struct blk_mq_tag_set *set;
 681         int ret;
 682
 683         if (admin) {
 684                 set = &ctrl->admin_tag_set;
 685                 memset(set, 0, sizeof(*set));
 686                 set->ops = &nvme_rdma_admin_mq_ops;
 687                 set->queue_depth = NVME_AQ_MQ_TAG_DEPTH;
 688                 set->reserved_tags = 2; /* connect + keep-alive */
 689                 set->numa_node = NUMA_NO_NODE;
 690                 set->cmd_size = sizeof(struct nvme_rdma_request) +
 691                         SG_CHUNK_SIZE * sizeof(struct scatterlist);
 692                 set->driver_data = ctrl;
 693                 set->nr_hw_queues = 1;
 694                 set->timeout = ADMIN_TIMEOUT;
 695                 set->flags = BLK_MQ_F_NO_SCHED;
 696         } else {
 697                 set = &ctrl->tag_set;
 698                 memset(set, 0, sizeof(*set));
 699                 set->ops = &nvme_rdma_mq_ops;
 700                 set->queue_depth = nctrl->sqsize + 1;
 701                 set->reserved_tags = 1; /* fabric connect */
 702                 set->numa_node = NUMA_NO_NODE;
 703                 set->flags = BLK_MQ_F_SHOULD_MERGE;
 704                 set->cmd_size = sizeof(struct nvme_rdma_request) +
 705                         SG_CHUNK_SIZE * sizeof(struct scatterlist);
 706                 set->driver_data = ctrl;
 707                 set->nr_hw_queues = nctrl->queue_count - 1;
 708                 set->timeout = NVME_IO_TIMEOUT;
 709         }
 710
 711         ret = blk_mq_alloc_tag_set(set);
 712         if (ret)
 713                 goto out;
 714
 715         /*
 716          * We need a reference on the device as long as the tag_set is alive,
 717          * as the MRs in the request structures need a valid ib_device.
 718          */
 719         ret = nvme_rdma_dev_get(ctrl->device);
 720         if (!ret) {
 721                 ret = -EINVAL;
 722                 goto out_free_tagset;
 723         }
 724
 725         return set;
 726
 727 out_free_tagset:
 728         blk_mq_free_tag_set(set);
 729 out:
 730         return ERR_PTR(ret);
 731 }
 732
 733 static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl,
 734                 bool remove)
 735 {
 736         if (remove) {
 737                 blk_cleanup_queue(ctrl->ctrl.admin_q);
 738                 nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.admin_tagset);
 739         }
 740         if (ctrl->async_event_sqe.data) {
 741                 nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,
 742                                 sizeof(struct nvme_command), DMA_TO_DEVICE);
 743                 ctrl->async_event_sqe.data = NULL;
 744         }
 745         nvme_rdma_free_queue(&ctrl->queues[0]);
 746 }
 747
 748 static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl,
 749                 bool new)
 750 {
 751         int error;
 752
 753         error = nvme_rdma_alloc_queue(ctrl, 0, NVME_AQ_DEPTH);
 754         if (error)
 755                 return error;
 756
 757         ctrl->device = ctrl->queues[0].device;
 758
 759         ctrl->max_fr_pages = nvme_rdma_get_max_fr_pages(ctrl->device->dev);
 760
 761         error = nvme_rdma_alloc_qe(ctrl->device->dev, &ctrl->async_event_sqe,
 762                         sizeof(struct nvme_command), DMA_TO_DEVICE);
 763         if (error)
 764                 goto out_free_queue;
 765
 766         if (new) {
 767                 ctrl->ctrl.admin_tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, true);
 768                 if (IS_ERR(ctrl->ctrl.admin_tagset)) {
 769                         error = PTR_ERR(ctrl->ctrl.admin_tagset);
 770                         goto out_free_async_qe;
 771                 }
 772
 773                 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
 774                 if (IS_ERR(ctrl->ctrl.admin_q)) {
 775                         error = PTR_ERR(ctrl->ctrl.admin_q);
 776                         goto out_free_tagset;
 777                 }
 778         }
 779
 780         error = nvme_rdma_start_queue(ctrl, 0);
 781         if (error)
 782                 goto out_cleanup_queue;
 783
 784         error = ctrl->ctrl.ops->reg_read64(&ctrl->ctrl, NVME_REG_CAP,
 785                         &ctrl->ctrl.cap);
 786         if (error) {
 787                 dev_err(ctrl->ctrl.device,
 788                         "prop_get NVME_REG_CAP failed\n");
 789                 goto out_stop_queue;
 790         }
 791
 792         ctrl->ctrl.sqsize =
 793                 min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize);
 794
 795         error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap);
 796         if (error)
 797                 goto out_stop_queue;
 798
 799         ctrl->ctrl.max_hw_sectors =
 800                 (ctrl->max_fr_pages - 1) << (ilog2(SZ_4K) - 9);
 801
 802         error = nvme_init_identify(&ctrl->ctrl);
 803         if (error)
 804                 goto out_stop_queue;
 805
 806         return 0;
 807
 808 out_stop_queue:
 809         nvme_rdma_stop_queue(&ctrl->queues[0]);
 810 out_cleanup_queue:
 811         if (new)
 812                 blk_cleanup_queue(ctrl->ctrl.admin_q);
 813 out_free_tagset:
 814         if (new)
 815                 nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.admin_tagset);
 816 out_free_async_qe:
 817         nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,
 818                 sizeof(struct nvme_command), DMA_TO_DEVICE);
 819 out_free_queue:
 820         nvme_rdma_free_queue(&ctrl->queues[0]);
 821         return error;
 822 }
 823
 824 static void nvme_rdma_destroy_io_queues(struct nvme_rdma_ctrl *ctrl,
 825                 bool remove)
 826 {
 827         if (remove) {
 828                 blk_cleanup_queue(ctrl->ctrl.connect_q);
 829                 nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.tagset);
 830         }
 831         nvme_rdma_free_io_queues(ctrl);
 832 }
 833
 834 static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new)
 835 {
 836         int ret;
 837
 838         ret = nvme_rdma_alloc_io_queues(ctrl);
 839         if (ret)
 840                 return ret;
 841
 842         if (new) {
 843                 ctrl->ctrl.tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, false);
 844                 if (IS_ERR(ctrl->ctrl.tagset)) {
 845                         ret = PTR_ERR(ctrl->ctrl.tagset);
 846                         goto out_free_io_queues;
 847                 }
 848
 849                 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
 850                 if (IS_ERR(ctrl->ctrl.connect_q)) {
 851                         ret = PTR_ERR(ctrl->ctrl.connect_q);
 852                         goto out_free_tag_set;
 853                 }
 854         } else {
 855                 blk_mq_update_nr_hw_queues(&ctrl->tag_set,
 856                         ctrl->ctrl.queue_count - 1);
 857         }
 858
 859         ret = nvme_rdma_start_io_queues(ctrl);
 860         if (ret)
 861                 goto out_cleanup_connect_q;
 862
 863         return 0;
 864
 865 out_cleanup_connect_q:
 866         if (new)
 867                 blk_cleanup_queue(ctrl->ctrl.connect_q);
 868 out_free_tag_set:
 869         if (new)
 870                 nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.tagset);
 871 out_free_io_queues:
 872         nvme_rdma_free_io_queues(ctrl);
 873         return ret;
 874 }
 875
 876 static void nvme_rdma_teardown_admin_queue(struct nvme_rdma_ctrl *ctrl,
 877                 bool remove)
 878 {
 879         blk_mq_quiesce_queue(ctrl->ctrl.admin_q);
 880         nvme_rdma_stop_queue(&ctrl->queues[0]);
 881         blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, nvme_cancel_request,
 882                         &ctrl->ctrl);
 883         blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
 884         nvme_rdma_destroy_admin_queue(ctrl, remove);
 885 }
 886
 887 static void nvme_rdma_teardown_io_queues(struct nvme_rdma_ctrl *ctrl,
 888                 bool remove)
 889 {
 890         if (ctrl->ctrl.queue_count > 1) {
 891                 nvme_stop_queues(&ctrl->ctrl);
 892                 nvme_rdma_stop_io_queues(ctrl);
 893                 blk_mq_tagset_busy_iter(&ctrl->tag_set, nvme_cancel_request,
 894                                 &ctrl->ctrl);
 895                 if (remove)
 896                         nvme_start_queues(&ctrl->ctrl);
 897                 nvme_rdma_destroy_io_queues(ctrl, remove);
 898         }
 899 }
 900
 901 static void nvme_rdma_stop_ctrl(struct nvme_ctrl *nctrl)
 902 {
 903         struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
 904
 905         cancel_work_sync(&ctrl->err_work);
 906         cancel_delayed_work_sync(&ctrl->reconnect_work);
 907 }
 908
 909 static void nvme_rdma_free_ctrl(struct nvme_ctrl *nctrl)
 910 {
 911         struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
 912
 913         if (list_empty(&ctrl->list))
 914                 goto free_ctrl;
 915
 916         mutex_lock(&nvme_rdma_ctrl_mutex);
 917         list_del(&ctrl->list);
 918         mutex_unlock(&nvme_rdma_ctrl_mutex);
 919
 920         nvmf_free_options(nctrl->opts);
 921 free_ctrl:
 922         kfree(ctrl->queues);
 923         kfree(ctrl);
 924 }
 925
 926 static void nvme_rdma_reconnect_or_remove(struct nvme_rdma_ctrl *ctrl)
 927 {
 928         /* If we are resetting/deleting then do nothing */
 929         if (ctrl->ctrl.state != NVME_CTRL_CONNECTING) {
 930                 WARN_ON_ONCE(ctrl->ctrl.state == NVME_CTRL_NEW ||
 931                         ctrl->ctrl.state == NVME_CTRL_LIVE);
 932                 return;
 933         }
 934
 935         if (nvmf_should_reconnect(&ctrl->ctrl)) {
 936                 dev_info(ctrl->ctrl.device, "Reconnecting in %d seconds...\n",
 937                         ctrl->ctrl.opts->reconnect_delay);
 938                 queue_delayed_work(nvme_wq, &ctrl->reconnect_work,
 939                                 ctrl->ctrl.opts->reconnect_delay * HZ);
 940         } else {
 941                 nvme_delete_ctrl(&ctrl->ctrl);
 942         }
 943 }
 944
 945 static int nvme_rdma_setup_ctrl(struct nvme_rdma_ctrl *ctrl, bool new)
 946 {
 947         int ret = -EINVAL;
 948         bool changed;
 949
 950         ret = nvme_rdma_configure_admin_queue(ctrl, new);
 951         if (ret)
 952                 return ret;
 953
 954         if (ctrl->ctrl.icdoff) {
 955                 dev_err(ctrl->ctrl.device, "icdoff is not supported!\n");
 956                 goto destroy_admin;
 957         }
 958
 959         if (!(ctrl->ctrl.sgls & (1 << 2))) {
 960                 dev_err(ctrl->ctrl.device,
 961                         "Mandatory keyed sgls are not supported!\n");
 962                 goto destroy_admin;
 963         }
 964
 965         if (ctrl->ctrl.opts->queue_size > ctrl->ctrl.sqsize + 1) {
 966                 dev_warn(ctrl->ctrl.device,
 967                         "queue_size %zu > ctrl sqsize %u, clamping down\n",
 968                         ctrl->ctrl.opts->queue_size, ctrl->ctrl.sqsize + 1);
 969         }
 970
 971         if (ctrl->ctrl.sqsize + 1 > ctrl->ctrl.maxcmd) {
 972                 dev_warn(ctrl->ctrl.device,
 973                         "sqsize %u > ctrl maxcmd %u, clamping down\n",
 974                         ctrl->ctrl.sqsize + 1, ctrl->ctrl.maxcmd);
 975                 ctrl->ctrl.sqsize = ctrl->ctrl.maxcmd - 1;
 976         }
 977
 978         if (ctrl->ctrl.sgls & (1 << 20))
 979                 ctrl->use_inline_data = true;
 980
 981         if (ctrl->ctrl.queue_count > 1) {
 982                 ret = nvme_rdma_configure_io_queues(ctrl, new);
 983                 if (ret)
 984                         goto destroy_admin;
 985         }
 986
 987         changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
 988         if (!changed) {
 989                 /* state change failure is ok if we're in DELETING state */
 990                 WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING);
 991                 ret = -EINVAL;
 992                 goto destroy_io;
 993         }
 994
 995         nvme_start_ctrl(&ctrl->ctrl);
 996         return 0;
 997
 998 destroy_io:
 999         if (ctrl->ctrl.queue_count > 1)
1000                 nvme_rdma_destroy_io_queues(ctrl, new);
1001 destroy_admin:
1002         nvme_rdma_stop_queue(&ctrl->queues[0]);
1003         nvme_rdma_destroy_admin_queue(ctrl, new);
1004         return ret;
1005 }
1006
1007 static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work)
1008 {
1009         struct nvme_rdma_ctrl *ctrl = container_of(to_delayed_work(work),
1010                         struct nvme_rdma_ctrl, reconnect_work);
1011
1012         ++ctrl->ctrl.nr_reconnects;
1013
1014         if (nvme_rdma_setup_ctrl(ctrl, false))
1015                 goto requeue;
1016
1017         dev_info(ctrl->ctrl.device, "Successfully reconnected (%d attempts)\n",
1018                         ctrl->ctrl.nr_reconnects);
1019
1020         ctrl->ctrl.nr_reconnects = 0;
1021
1022         return;
1023
1024 requeue:
1025         dev_info(ctrl->ctrl.device, "Failed reconnect attempt %d\n",
1026                         ctrl->ctrl.nr_reconnects);
1027         nvme_rdma_reconnect_or_remove(ctrl);
1028 }
1029
1030 static void nvme_rdma_error_recovery_work(struct work_struct *work)
1031 {
1032         struct nvme_rdma_ctrl *ctrl = container_of(work,
1033                         struct nvme_rdma_ctrl, err_work);
1034
1035         nvme_stop_keep_alive(&ctrl->ctrl);
1036         nvme_rdma_teardown_io_queues(ctrl, false);
1037         nvme_start_queues(&ctrl->ctrl);
1038         nvme_rdma_teardown_admin_queue(ctrl, false);
1039
1040         if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
1041                 /* state change failure is ok if we're in DELETING state */
1042                 WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING);
1043                 return;
1044         }
1045
1046         nvme_rdma_reconnect_or_remove(ctrl);
1047 }
1048
1049 static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl *ctrl)
1050 {
1051         if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING))
1052                 return;
1053
1054         queue_work(nvme_wq, &ctrl->err_work);
1055 }
1056
1057 static void nvme_rdma_wr_error(struct ib_cq *cq, struct ib_wc *wc,
1058                 const char *op)
1059 {
1060         struct nvme_rdma_queue *queue = cq->cq_context;
1061         struct nvme_rdma_ctrl *ctrl = queue->ctrl;
1062
1063         if (ctrl->ctrl.state == NVME_CTRL_LIVE)
1064                 dev_info(ctrl->ctrl.device,
1065                              "%s for CQE 0x%p failed with status %s (%d)\n",
1066                              op, wc->wr_cqe,
1067                              ib_wc_status_msg(wc->status), wc->status);
1068         nvme_rdma_error_recovery(ctrl);
1069 }
1070
1071 static void nvme_rdma_memreg_done(struct ib_cq *cq, struct ib_wc *wc)
1072 {
1073         if (unlikely(wc->status != IB_WC_SUCCESS))
1074                 nvme_rdma_wr_error(cq, wc, "MEMREG");
1075 }
1076
1077 static void nvme_rdma_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc)
1078 {
1079         struct nvme_rdma_request *req =
1080                 container_of(wc->wr_cqe, struct nvme_rdma_request, reg_cqe);
1081         struct request *rq = blk_mq_rq_from_pdu(req);
1082
1083         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1084                 nvme_rdma_wr_error(cq, wc, "LOCAL_INV");
1085                 return;
1086         }
1087
1088         if (refcount_dec_and_test(&req->ref))
1089                 nvme_end_request(rq, req->status, req->result);
1090
1091 }
1092
1093 static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue,
1094                 struct nvme_rdma_request *req)
1095 {
1096         struct ib_send_wr wr = {
1097                 .opcode             = IB_WR_LOCAL_INV,
1098                 .next               = NULL,
1099                 .num_sge            = 0,
1100                 .send_flags         = IB_SEND_SIGNALED,
1101                 .ex.invalidate_rkey = req->mr->rkey,
1102         };
1103
1104         req->reg_cqe.done = nvme_rdma_inv_rkey_done;
1105         wr.wr_cqe = &req->reg_cqe;
1106
1107         return ib_post_send(queue->qp, &wr, NULL);
1108 }
1109
1110 static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue,
1111                 struct request *rq)
1112 {
1113         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1114         struct nvme_rdma_device *dev = queue->device;
1115         struct ib_device *ibdev = dev->dev;
1116
1117         if (!blk_rq_payload_bytes(rq))
1118                 return;
1119
1120         if (req->mr) {
1121                 ib_mr_pool_put(queue->qp, &queue->qp->rdma_mrs, req->mr);
1122                 req->mr = NULL;
1123         }
1124
1125         ib_dma_unmap_sg(ibdev, req->sg_table.sgl,
1126                         req->nents, rq_data_dir(rq) ==
1127                                     WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
1128
1129         nvme_cleanup_cmd(rq);
1130         sg_free_table_chained(&req->sg_table, true);
1131 }
1132
1133 static int nvme_rdma_set_sg_null(struct nvme_command *c)
1134 {
1135         struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
1136
1137         sg->addr = 0;
1138         put_unaligned_le24(0, sg->length);
1139         put_unaligned_le32(0, sg->key);
1140         sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
1141         return 0;
1142 }
1143
1144 static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue *queue,
1145                 struct nvme_rdma_request *req, struct nvme_command *c,
1146                 int count)
1147 {
1148         struct nvme_sgl_desc *sg = &c->common.dptr.sgl;
1149         struct scatterlist *sgl = req->sg_table.sgl;
1150         struct ib_sge *sge = &req->sge[1];
1151         u32 len = 0;
1152         int i;
1153
1154         for (i = 0; i < count; i++, sgl++, sge++) {
1155                 sge->addr = sg_dma_address(sgl);
1156                 sge->length = sg_dma_len(sgl);
1157                 sge->lkey = queue->device->pd->local_dma_lkey;
1158                 len += sge->length;
1159         }
1160
1161         sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff);
1162         sg->length = cpu_to_le32(len);
1163         sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET;
1164
1165         req->num_sge += count;
1166         return 0;
1167 }
1168
1169 static int nvme_rdma_map_sg_single(struct nvme_rdma_queue *queue,
1170                 struct nvme_rdma_request *req, struct nvme_command *c)
1171 {
1172         struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
1173
1174         sg->addr = cpu_to_le64(sg_dma_address(req->sg_table.sgl));
1175         put_unaligned_le24(sg_dma_len(req->sg_table.sgl), sg->length);
1176         put_unaligned_le32(queue->device->pd->unsafe_global_rkey, sg->key);
1177         sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
1178         return 0;
1179 }
1180
1181 static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue *queue,
1182                 struct nvme_rdma_request *req, struct nvme_command *c,
1183                 int count)
1184 {
1185         struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
1186         int nr;
1187
1188         req->mr = ib_mr_pool_get(queue->qp, &queue->qp->rdma_mrs);
1189         if (WARN_ON_ONCE(!req->mr))
1190                 return -EAGAIN;
1191
1192         /*
1193          * Align the MR to a 4K page size to match the ctrl page size and
1194          * the block virtual boundary.
1195          */
1196         nr = ib_map_mr_sg(req->mr, req->sg_table.sgl, count, NULL, SZ_4K);
1197         if (unlikely(nr < count)) {
1198                 ib_mr_pool_put(queue->qp, &queue->qp->rdma_mrs, req->mr);
1199                 req->mr = NULL;
1200                 if (nr < 0)
1201                         return nr;
1202                 return -EINVAL;
1203         }
1204
1205         ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey));
1206
1207         req->reg_cqe.done = nvme_rdma_memreg_done;
1208         memset(&req->reg_wr, 0, sizeof(req->reg_wr));
1209         req->reg_wr.wr.opcode = IB_WR_REG_MR;
1210         req->reg_wr.wr.wr_cqe = &req->reg_cqe;
1211         req->reg_wr.wr.num_sge = 0;
1212         req->reg_wr.mr = req->mr;
1213         req->reg_wr.key = req->mr->rkey;
1214         req->reg_wr.access = IB_ACCESS_LOCAL_WRITE |
1215                              IB_ACCESS_REMOTE_READ |
1216                              IB_ACCESS_REMOTE_WRITE;
1217
1218         sg->addr = cpu_to_le64(req->mr->iova);
1219         put_unaligned_le24(req->mr->length, sg->length);
1220         put_unaligned_le32(req->mr->rkey, sg->key);
1221         sg->type = (NVME_KEY_SGL_FMT_DATA_DESC << 4) |
1222                         NVME_SGL_FMT_INVALIDATE;
1223
1224         return 0;
1225 }
1226
1227 static int nvme_rdma_map_data(struct nvme_rdma_queue *queue,
1228                 struct request *rq, struct nvme_command *c)
1229 {
1230         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1231         struct nvme_rdma_device *dev = queue->device;
1232         struct ib_device *ibdev = dev->dev;
1233         int count, ret;
1234
1235         req->num_sge = 1;
1236         refcount_set(&req->ref, 2); /* send and recv completions */
1237
1238         c->common.flags |= NVME_CMD_SGL_METABUF;
1239
1240         if (!blk_rq_payload_bytes(rq))
1241                 return nvme_rdma_set_sg_null(c);
1242
1243         req->sg_table.sgl = req->first_sgl;
1244         ret = sg_alloc_table_chained(&req->sg_table,
1245                         blk_rq_nr_phys_segments(rq), req->sg_table.sgl);
1246         if (ret)
1247                 return -ENOMEM;
1248
1249         req->nents = blk_rq_map_sg(rq->q, rq, req->sg_table.sgl);
1250
1251         count = ib_dma_map_sg(ibdev, req->sg_table.sgl, req->nents,
1252                     rq_data_dir(rq) == WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
1253         if (unlikely(count <= 0)) {
1254                 ret = -EIO;
1255                 goto out_free_table;
1256         }
1257
1258         if (count <= dev->num_inline_segments) {
1259                 if (rq_data_dir(rq) == WRITE && nvme_rdma_queue_idx(queue) &&
1260                     queue->ctrl->use_inline_data &&
1261                     blk_rq_payload_bytes(rq) <=
1262                                 nvme_rdma_inline_data_size(queue)) {
1263                         ret = nvme_rdma_map_sg_inline(queue, req, c, count);
1264                         goto out;
1265                 }
1266
1267                 if (count == 1 && dev->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY) {
1268                         ret = nvme_rdma_map_sg_single(queue, req, c);
1269                         goto out;
1270                 }
1271         }
1272
1273         ret = nvme_rdma_map_sg_fr(queue, req, c, count);
1274 out:
1275         if (unlikely(ret))
1276                 goto out_unmap_sg;
1277
1278         return 0;
1279
1280 out_unmap_sg:
1281         ib_dma_unmap_sg(ibdev, req->sg_table.sgl,
1282                         req->nents, rq_data_dir(rq) ==
1283                         WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
1284 out_free_table:
1285         sg_free_table_chained(&req->sg_table, true);
1286         return ret;
1287 }
1288
1289 static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
1290 {
1291         struct nvme_rdma_qe *qe =
1292                 container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
1293         struct nvme_rdma_request *req =
1294                 container_of(qe, struct nvme_rdma_request, sqe);
1295         struct request *rq = blk_mq_rq_from_pdu(req);
1296
1297         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1298                 nvme_rdma_wr_error(cq, wc, "SEND");
1299                 return;
1300         }
1301
1302         if (refcount_dec_and_test(&req->ref))
1303                 nvme_end_request(rq, req->status, req->result);
1304 }
1305
1306 static int nvme_rdma_post_send(struct nvme_rdma_queue *queue,
1307                 struct nvme_rdma_qe *qe, struct ib_sge *sge, u32 num_sge,
1308                 struct ib_send_wr *first)
1309 {
1310         struct ib_send_wr wr;
1311         int ret;
1312
1313         sge->addr   = qe->dma;
1314         sge->length = sizeof(struct nvme_command),
1315         sge->lkey   = queue->device->pd->local_dma_lkey;
1316
1317         wr.next       = NULL;
1318         wr.wr_cqe     = &qe->cqe;
1319         wr.sg_list    = sge;
1320         wr.num_sge    = num_sge;
1321         wr.opcode     = IB_WR_SEND;
1322         wr.send_flags = IB_SEND_SIGNALED;
1323
1324         if (first)
1325                 first->next = &wr;
1326         else
1327                 first = &wr;
1328
1329         ret = ib_post_send(queue->qp, first, NULL);
1330         if (unlikely(ret)) {
1331                 dev_err(queue->ctrl->ctrl.device,
1332                              "%s failed with error code %d\n", __func__, ret);
1333         }
1334         return ret;
1335 }
1336
1337 static int nvme_rdma_post_recv(struct nvme_rdma_queue *queue,
1338                 struct nvme_rdma_qe *qe)
1339 {
1340         struct ib_recv_wr wr;
1341         struct ib_sge list;
1342         int ret;
1343
1344         list.addr   = qe->dma;
1345         list.length = sizeof(struct nvme_completion);
1346         list.lkey   = queue->device->pd->local_dma_lkey;
1347
1348         qe->cqe.done = nvme_rdma_recv_done;
1349
1350         wr.next     = NULL;
1351         wr.wr_cqe   = &qe->cqe;
1352         wr.sg_list  = &list;
1353         wr.num_sge  = 1;
1354
1355         ret = ib_post_recv(queue->qp, &wr, NULL);
1356         if (unlikely(ret)) {
1357                 dev_err(queue->ctrl->ctrl.device,
1358                         "%s failed with error code %d\n", __func__, ret);
1359         }
1360         return ret;
1361 }
1362
1363 static struct blk_mq_tags *nvme_rdma_tagset(struct nvme_rdma_queue *queue)
1364 {
1365         u32 queue_idx = nvme_rdma_queue_idx(queue);
1366
1367         if (queue_idx == 0)
1368                 return queue->ctrl->admin_tag_set.tags[queue_idx];
1369         return queue->ctrl->tag_set.tags[queue_idx - 1];
1370 }
1371
1372 static void nvme_rdma_async_done(struct ib_cq *cq, struct ib_wc *wc)
1373 {
1374         if (unlikely(wc->status != IB_WC_SUCCESS))
1375                 nvme_rdma_wr_error(cq, wc, "ASYNC");
1376 }
1377
1378 static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg)
1379 {
1380         struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(arg);
1381         struct nvme_rdma_queue *queue = &ctrl->queues[0];
1382         struct ib_device *dev = queue->device->dev;
1383         struct nvme_rdma_qe *sqe = &ctrl->async_event_sqe;
1384         struct nvme_command *cmd = sqe->data;
1385         struct ib_sge sge;
1386         int ret;
1387
1388         ib_dma_sync_single_for_cpu(dev, sqe->dma, sizeof(*cmd), DMA_TO_DEVICE);
1389
1390         memset(cmd, 0, sizeof(*cmd));
1391         cmd->common.opcode = nvme_admin_async_event;
1392         cmd->common.command_id = NVME_AQ_BLK_MQ_DEPTH;
1393         cmd->common.flags |= NVME_CMD_SGL_METABUF;
1394         nvme_rdma_set_sg_null(cmd);
1395
1396         sqe->cqe.done = nvme_rdma_async_done;
1397
1398         ib_dma_sync_single_for_device(dev, sqe->dma, sizeof(*cmd),
1399                         DMA_TO_DEVICE);
1400
1401         ret = nvme_rdma_post_send(queue, sqe, &sge, 1, NULL);
1402         WARN_ON_ONCE(ret);
1403 }
1404
1405 static int nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue,
1406                 struct nvme_completion *cqe, struct ib_wc *wc, int tag)
1407 {
1408         struct request *rq;
1409         struct nvme_rdma_request *req;
1410         int ret = 0;
1411
1412         rq = blk_mq_tag_to_rq(nvme_rdma_tagset(queue), cqe->command_id);
1413         if (!rq) {
1414                 dev_err(queue->ctrl->ctrl.device,
1415                         "tag 0x%x on QP %#x not found\n",
1416                         cqe->command_id, queue->qp->qp_num);
1417                 nvme_rdma_error_recovery(queue->ctrl);
1418                 return ret;
1419         }
1420         req = blk_mq_rq_to_pdu(rq);
1421
1422         req->status = cqe->status;
1423         req->result = cqe->result;
1424
1425         if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
1426                 if (unlikely(wc->ex.invalidate_rkey != req->mr->rkey)) {
1427                         dev_err(queue->ctrl->ctrl.device,
1428                                 "Bogus remote invalidation for rkey %#x\n",
1429                                 req->mr->rkey);
1430                         nvme_rdma_error_recovery(queue->ctrl);
1431                 }
1432         } else if (req->mr) {
1433                 ret = nvme_rdma_inv_rkey(queue, req);
1434                 if (unlikely(ret < 0)) {
1435                         dev_err(queue->ctrl->ctrl.device,
1436                                 "Queueing INV WR for rkey %#x failed (%d)\n",
1437                                 req->mr->rkey, ret);
1438                         nvme_rdma_error_recovery(queue->ctrl);
1439                 }
1440                 /* the local invalidation completion will end the request */
1441                 return 0;
1442         }
1443
1444         if (refcount_dec_and_test(&req->ref)) {
1445                 if (rq->tag == tag)
1446                         ret = 1;
1447                 nvme_end_request(rq, req->status, req->result);
1448         }
1449
1450         return ret;
1451 }
1452
1453 static int __nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc, int tag)
1454 {
1455         struct nvme_rdma_qe *qe =
1456                 container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
1457         struct nvme_rdma_queue *queue = cq->cq_context;
1458         struct ib_device *ibdev = queue->device->dev;
1459         struct nvme_completion *cqe = qe->data;
1460         const size_t len = sizeof(struct nvme_completion);
1461         int ret = 0;
1462
1463         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1464                 nvme_rdma_wr_error(cq, wc, "RECV");
1465                 return 0;
1466         }
1467
1468         ib_dma_sync_single_for_cpu(ibdev, qe->dma, len, DMA_FROM_DEVICE);
1469         /*
1470          * AEN requests are special as they don't time out and can
1471          * survive any kind of queue freeze and often don't respond to
1472          * aborts.  We don't even bother to allocate a struct request
1473          * for them but rather special case them here.
1474          */
1475         if (unlikely(nvme_rdma_queue_idx(queue) == 0 &&
1476                         cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH))
1477                 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
1478                                 &cqe->result);
1479         else
1480                 ret = nvme_rdma_process_nvme_rsp(queue, cqe, wc, tag);
1481         ib_dma_sync_single_for_device(ibdev, qe->dma, len, DMA_FROM_DEVICE);
1482
1483         nvme_rdma_post_recv(queue, qe);
1484         return ret;
1485 }
1486
1487 static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1488 {
1489         __nvme_rdma_recv_done(cq, wc, -1);
1490 }
1491
1492 static int nvme_rdma_conn_established(struct nvme_rdma_queue *queue)
1493 {
1494         int ret, i;
1495
1496         for (i = 0; i < queue->queue_size; i++) {
1497                 ret = nvme_rdma_post_recv(queue, &queue->rsp_ring[i]);
1498                 if (ret)
1499                         goto out_destroy_queue_ib;
1500         }
1501
1502         return 0;
1503
1504 out_destroy_queue_ib:
1505         nvme_rdma_destroy_queue_ib(queue);
1506         return ret;
1507 }
1508
1509 static int nvme_rdma_conn_rejected(struct nvme_rdma_queue *queue,
1510                 struct rdma_cm_event *ev)
1511 {
1512         struct rdma_cm_id *cm_id = queue->cm_id;
1513         int status = ev->status;
1514         const char *rej_msg;
1515         const struct nvme_rdma_cm_rej *rej_data;
1516         u8 rej_data_len;
1517
1518         rej_msg = rdma_reject_msg(cm_id, status);
1519         rej_data = rdma_consumer_reject_data(cm_id, ev, &rej_data_len);
1520
1521         if (rej_data && rej_data_len >= sizeof(u16)) {
1522                 u16 sts = le16_to_cpu(rej_data->sts);
1523
1524                 dev_err(queue->ctrl->ctrl.device,
1525                       "Connect rejected: status %d (%s) nvme status %d (%s).\n",
1526                       status, rej_msg, sts, nvme_rdma_cm_msg(sts));
1527         } else {
1528                 dev_err(queue->ctrl->ctrl.device,
1529                         "Connect rejected: status %d (%s).\n", status, rej_msg);
1530         }
1531
1532         return -ECONNRESET;
1533 }
1534
1535 static int nvme_rdma_addr_resolved(struct nvme_rdma_queue *queue)
1536 {
1537         int ret;
1538
1539         ret = nvme_rdma_create_queue_ib(queue);
1540         if (ret)
1541                 return ret;
1542
1543         ret = rdma_resolve_route(queue->cm_id, NVME_RDMA_CONNECT_TIMEOUT_MS);
1544         if (ret) {
1545                 dev_err(queue->ctrl->ctrl.device,
1546                         "rdma_resolve_route failed (%d).\n",
1547                         queue->cm_error);
1548                 goto out_destroy_queue;
1549         }
1550
1551         return 0;
1552
1553 out_destroy_queue:
1554         nvme_rdma_destroy_queue_ib(queue);
1555         return ret;
1556 }
1557
1558 static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue)
1559 {
1560         struct nvme_rdma_ctrl *ctrl = queue->ctrl;
1561         struct rdma_conn_param param = { };
1562         struct nvme_rdma_cm_req priv = { };
1563         int ret;
1564
1565         param.qp_num = queue->qp->qp_num;
1566         param.flow_control = 1;
1567
1568         param.responder_resources = queue->device->dev->attrs.max_qp_rd_atom;
1569         /* maximum retry count */
1570         param.retry_count = 7;
1571         param.rnr_retry_count = 7;
1572         param.private_data = &priv;
1573         param.private_data_len = sizeof(priv);
1574
1575         priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1576         priv.qid = cpu_to_le16(nvme_rdma_queue_idx(queue));
1577         /*
1578          * set the admin queue depth to the minimum size
1579          * specified by the Fabrics standard.
1580          */
1581         if (priv.qid == 0) {
1582                 priv.hrqsize = cpu_to_le16(NVME_AQ_DEPTH);
1583                 priv.hsqsize = cpu_to_le16(NVME_AQ_DEPTH - 1);
1584         } else {
1585                 /*
1586                  * current interpretation of the fabrics spec
1587                  * is at minimum you make hrqsize sqsize+1, or a
1588                  * 1's based representation of sqsize.
1589                  */
1590                 priv.hrqsize = cpu_to_le16(queue->queue_size);
1591                 priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize);
1592         }
1593
1594         ret = rdma_connect(queue->cm_id, &param);
1595         if (ret) {
1596                 dev_err(ctrl->ctrl.device,
1597                         "rdma_connect failed (%d).\n", ret);
1598                 goto out_destroy_queue_ib;
1599         }
1600
1601         return 0;
1602
1603 out_destroy_queue_ib:
1604         nvme_rdma_destroy_queue_ib(queue);
1605         return ret;
1606 }
1607
1608 static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
1609                 struct rdma_cm_event *ev)
1610 {
1611         struct nvme_rdma_queue *queue = cm_id->context;
1612         int cm_error = 0;
1613
1614         dev_dbg(queue->ctrl->ctrl.device, "%s (%d): status %d id %p\n",
1615                 rdma_event_msg(ev->event), ev->event,
1616                 ev->status, cm_id);
1617
1618         switch (ev->event) {
1619         case RDMA_CM_EVENT_ADDR_RESOLVED:
1620                 cm_error = nvme_rdma_addr_resolved(queue);
1621                 break;
1622         case RDMA_CM_EVENT_ROUTE_RESOLVED:
1623                 cm_error = nvme_rdma_route_resolved(queue);
1624                 break;
1625         case RDMA_CM_EVENT_ESTABLISHED:
1626                 queue->cm_error = nvme_rdma_conn_established(queue);
1627                 /* complete cm_done regardless of success/failure */
1628                 complete(&queue->cm_done);
1629                 return 0;
1630         case RDMA_CM_EVENT_REJECTED:
1631                 nvme_rdma_destroy_queue_ib(queue);
1632                 cm_error = nvme_rdma_conn_rejected(queue, ev);
1633                 break;
1634         case RDMA_CM_EVENT_ROUTE_ERROR:
1635         case RDMA_CM_EVENT_CONNECT_ERROR:
1636         case RDMA_CM_EVENT_UNREACHABLE:
1637                 nvme_rdma_destroy_queue_ib(queue);
1638                 /* fall through */
1639         case RDMA_CM_EVENT_ADDR_ERROR:
1640                 dev_dbg(queue->ctrl->ctrl.device,
1641                         "CM error event %d\n", ev->event);
1642                 cm_error = -ECONNRESET;
1643                 break;
1644         case RDMA_CM_EVENT_DISCONNECTED:
1645         case RDMA_CM_EVENT_ADDR_CHANGE:
1646         case RDMA_CM_EVENT_TIMEWAIT_EXIT:
1647                 dev_dbg(queue->ctrl->ctrl.device,
1648                         "disconnect received - connection closed\n");
1649                 nvme_rdma_error_recovery(queue->ctrl);
1650                 break;
1651         case RDMA_CM_EVENT_DEVICE_REMOVAL:
1652                 /* device removal is handled via the ib_client API */
1653                 break;
1654         default:
1655                 dev_err(queue->ctrl->ctrl.device,
1656                         "Unexpected RDMA CM event (%d)\n", ev->event);
1657                 nvme_rdma_error_recovery(queue->ctrl);
1658                 break;
1659         }
1660
1661         if (cm_error) {
1662                 queue->cm_error = cm_error;
1663                 complete(&queue->cm_done);
1664         }
1665
1666         return 0;
1667 }
1668
1669 static enum blk_eh_timer_return
1670 nvme_rdma_timeout(struct request *rq, bool reserved)
1671 {
1672         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1673
1674         dev_warn(req->queue->ctrl->ctrl.device,
1675                  "I/O %d QID %d timeout, reset controller\n",
1676                  rq->tag, nvme_rdma_queue_idx(req->queue));
1677
1678         /* queue error recovery */
1679         nvme_rdma_error_recovery(req->queue->ctrl);
1680
1681         /* fail with DNR on cmd timeout */
1682         nvme_req(rq)->status = NVME_SC_ABORT_REQ | NVME_SC_DNR;
1683
1684         return BLK_EH_DONE;
1685 }
1686
1687 static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
1688                 const struct blk_mq_queue_data *bd)
1689 {
1690         struct nvme_ns *ns = hctx->queue->queuedata;
1691         struct nvme_rdma_queue *queue = hctx->driver_data;
1692         struct request *rq = bd->rq;
1693         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1694         struct nvme_rdma_qe *sqe = &req->sqe;
1695         struct nvme_command *c = sqe->data;
1696         struct ib_device *dev;
1697         bool queue_ready = test_bit(NVME_RDMA_Q_LIVE, &queue->flags);
1698         blk_status_t ret;
1699         int err;
1700
1701         WARN_ON_ONCE(rq->tag < 0);
1702
1703         if (!nvmf_check_ready(&queue->ctrl->ctrl, rq, queue_ready))
1704                 return nvmf_fail_nonready_command(&queue->ctrl->ctrl, rq);
1705
1706         dev = queue->device->dev;
1707         ib_dma_sync_single_for_cpu(dev, sqe->dma,
1708                         sizeof(struct nvme_command), DMA_TO_DEVICE);
1709
1710         ret = nvme_setup_cmd(ns, rq, c);
1711         if (ret)
1712                 return ret;
1713
1714         blk_mq_start_request(rq);
1715
1716         err = nvme_rdma_map_data(queue, rq, c);
1717         if (unlikely(err < 0)) {
1718                 dev_err(queue->ctrl->ctrl.device,
1719                              "Failed to map data (%d)\n", err);
1720                 nvme_cleanup_cmd(rq);
1721                 goto err;
1722         }
1723
1724         sqe->cqe.done = nvme_rdma_send_done;
1725
1726         ib_dma_sync_single_for_device(dev, sqe->dma,
1727                         sizeof(struct nvme_command), DMA_TO_DEVICE);
1728
1729         err = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge,
1730                         req->mr ? &req->reg_wr.wr : NULL);
1731         if (unlikely(err)) {
1732                 nvme_rdma_unmap_data(queue, rq);
1733                 goto err;
1734         }
1735
1736         return BLK_STS_OK;
1737 err:
1738         if (err == -ENOMEM || err == -EAGAIN)
1739                 return BLK_STS_RESOURCE;
1740         return BLK_STS_IOERR;
1741 }
1742
1743 static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag)
1744 {
1745         struct nvme_rdma_queue *queue = hctx->driver_data;
1746         struct ib_cq *cq = queue->ib_cq;
1747         struct ib_wc wc;
1748         int found = 0;
1749
1750         while (ib_poll_cq(cq, 1, &wc) > 0) {
1751                 struct ib_cqe *cqe = wc.wr_cqe;
1752
1753                 if (cqe) {
1754                         if (cqe->done == nvme_rdma_recv_done)
1755                                 found |= __nvme_rdma_recv_done(cq, &wc, tag);
1756                         else
1757                                 cqe->done(cq, &wc);
1758                 }
1759         }
1760
1761         return found;
1762 }
1763
1764 static void nvme_rdma_complete_rq(struct request *rq)
1765 {
1766         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1767
1768         nvme_rdma_unmap_data(req->queue, rq);
1769         nvme_complete_rq(rq);
1770 }
1771
1772 static int nvme_rdma_map_queues(struct blk_mq_tag_set *set)
1773 {
1774         struct nvme_rdma_ctrl *ctrl = set->driver_data;
1775
1776         return blk_mq_rdma_map_queues(set, ctrl->device->dev, 0);
1777 }
1778
1779 static const struct blk_mq_ops nvme_rdma_mq_ops = {
1780         .queue_rq       = nvme_rdma_queue_rq,
1781         .complete       = nvme_rdma_complete_rq,
1782         .init_request   = nvme_rdma_init_request,
1783         .exit_request   = nvme_rdma_exit_request,
1784         .init_hctx      = nvme_rdma_init_hctx,
1785         .poll           = nvme_rdma_poll,
1786         .timeout        = nvme_rdma_timeout,
1787         .map_queues     = nvme_rdma_map_queues,
1788 };
1789
1790 static const struct blk_mq_ops nvme_rdma_admin_mq_ops = {
1791         .queue_rq       = nvme_rdma_queue_rq,
1792         .complete       = nvme_rdma_complete_rq,
1793         .init_request   = nvme_rdma_init_request,
1794         .exit_request   = nvme_rdma_exit_request,
1795         .init_hctx      = nvme_rdma_init_admin_hctx,
1796         .timeout        = nvme_rdma_timeout,
1797 };
1798
1799 static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
1800 {
1801         nvme_rdma_teardown_io_queues(ctrl, shutdown);
1802         if (shutdown)
1803                 nvme_shutdown_ctrl(&ctrl->ctrl);
1804         else
1805                 nvme_disable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap);
1806         nvme_rdma_teardown_admin_queue(ctrl, shutdown);
1807 }
1808
1809 static void nvme_rdma_delete_ctrl(struct nvme_ctrl *ctrl)
1810 {
1811         nvme_rdma_shutdown_ctrl(to_rdma_ctrl(ctrl), true);
1812 }
1813
1814 static void nvme_rdma_reset_ctrl_work(struct work_struct *work)
1815 {
1816         struct nvme_rdma_ctrl *ctrl =
1817                 container_of(work, struct nvme_rdma_ctrl, ctrl.reset_work);
1818
1819         nvme_stop_ctrl(&ctrl->ctrl);
1820         nvme_rdma_shutdown_ctrl(ctrl, false);
1821
1822         if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
1823                 /* state change failure should never happen */
1824                 WARN_ON_ONCE(1);
1825                 return;
1826         }
1827
1828         if (nvme_rdma_setup_ctrl(ctrl, false))
1829                 goto out_fail;
1830
1831         return;
1832
1833 out_fail:
1834         ++ctrl->ctrl.nr_reconnects;
1835         nvme_rdma_reconnect_or_remove(ctrl);
1836 }
1837
1838 static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {
1839         .name                   = "rdma",
1840         .module                 = THIS_MODULE,
1841         .flags                  = NVME_F_FABRICS,
1842         .reg_read32             = nvmf_reg_read32,
1843         .reg_read64             = nvmf_reg_read64,
1844         .reg_write32            = nvmf_reg_write32,
1845         .free_ctrl              = nvme_rdma_free_ctrl,
1846         .submit_async_event     = nvme_rdma_submit_async_event,
1847         .delete_ctrl            = nvme_rdma_delete_ctrl,
1848         .get_address            = nvmf_get_address,
1849         .stop_ctrl              = nvme_rdma_stop_ctrl,
1850 };
1851
1852 static inline bool
1853 __nvme_rdma_options_match(struct nvme_rdma_ctrl *ctrl,
1854         struct nvmf_ctrl_options *opts)
1855 {
1856         char *stdport = __stringify(NVME_RDMA_IP_PORT);
1857
1858
1859         if (!nvmf_ctlr_matches_baseopts(&ctrl->ctrl, opts) ||
1860             strcmp(opts->traddr, ctrl->ctrl.opts->traddr))
1861                 return false;
1862
1863         if (opts->mask & NVMF_OPT_TRSVCID &&
1864             ctrl->ctrl.opts->mask & NVMF_OPT_TRSVCID) {
1865                 if (strcmp(opts->trsvcid, ctrl->ctrl.opts->trsvcid))
1866                         return false;
1867         } else if (opts->mask & NVMF_OPT_TRSVCID) {
1868                 if (strcmp(opts->trsvcid, stdport))
1869                         return false;
1870         } else if (ctrl->ctrl.opts->mask & NVMF_OPT_TRSVCID) {
1871                 if (strcmp(stdport, ctrl->ctrl.opts->trsvcid))
1872                         return false;
1873         }
1874         /* else, it's a match as both have stdport. Fall to next checks */
1875
1876         /*
1877          * checking the local address is rough. In most cases, one
1878          * is not specified and the host port is selected by the stack.
1879          *
1880          * Assume no match if:
1881          *  local address is specified and address is not the same
1882          *  local address is not specified but remote is, or vice versa
1883          *    (admin using specific host_traddr when it matters).
1884          */
1885         if (opts->mask & NVMF_OPT_HOST_TRADDR &&
1886             ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR) {
1887                 if (strcmp(opts->host_traddr, ctrl->ctrl.opts->host_traddr))
1888                         return false;
1889         } else if (opts->mask & NVMF_OPT_HOST_TRADDR ||
1890                    ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR)
1891                 return false;
1892         /*
1893          * if neither controller had an host port specified, assume it's
1894          * a match as everything else matched.
1895          */
1896
1897         return true;
1898 }
1899
1900 /*
1901  * Fails a connection request if it matches an existing controller
1902  * (association) with the same tuple:
1903  * <Host NQN, Host ID, local address, remote address, remote port, SUBSYS NQN>
1904  *
1905  * if local address is not specified in the request, it will match an
1906  * existing controller with all the other parameters the same and no
1907  * local port address specified as well.
1908  *
1909  * The ports don't need to be compared as they are intrinsically
1910  * already matched by the port pointers supplied.
1911  */
1912 static bool
1913 nvme_rdma_existing_controller(struct nvmf_ctrl_options *opts)
1914 {
1915         struct nvme_rdma_ctrl *ctrl;
1916         bool found = false;
1917
1918         mutex_lock(&nvme_rdma_ctrl_mutex);
1919         list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
1920                 found = __nvme_rdma_options_match(ctrl, opts);
1921                 if (found)
1922                         break;
1923         }
1924         mutex_unlock(&nvme_rdma_ctrl_mutex);
1925
1926         return found;
1927 }
1928
1929 static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
1930                 struct nvmf_ctrl_options *opts)
1931 {
1932         struct nvme_rdma_ctrl *ctrl;
1933         int ret;
1934         bool changed;
1935         char *port;
1936
1937         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
1938         if (!ctrl)
1939                 return ERR_PTR(-ENOMEM);
1940         ctrl->ctrl.opts = opts;
1941         INIT_LIST_HEAD(&ctrl->list);
1942
1943         if (opts->mask & NVMF_OPT_TRSVCID)
1944                 port = opts->trsvcid;
1945         else
1946                 port = __stringify(NVME_RDMA_IP_PORT);
1947
1948         ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
1949                         opts->traddr, port, &ctrl->addr);
1950         if (ret) {
1951                 pr_err("malformed address passed: %s:%s\n", opts->traddr, port);
1952                 goto out_free_ctrl;
1953         }
1954
1955         if (opts->mask & NVMF_OPT_HOST_TRADDR) {
1956                 ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
1957                         opts->host_traddr, NULL, &ctrl->src_addr);
1958                 if (ret) {
1959                         pr_err("malformed src address passed: %s\n",
1960                                opts->host_traddr);
1961                         goto out_free_ctrl;
1962                 }
1963         }
1964
1965         if (!opts->duplicate_connect && nvme_rdma_existing_controller(opts)) {
1966                 ret = -EALREADY;
1967                 goto out_free_ctrl;
1968         }
1969
1970         INIT_DELAYED_WORK(&ctrl->reconnect_work,
1971                         nvme_rdma_reconnect_ctrl_work);
1972         INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work);
1973         INIT_WORK(&ctrl->ctrl.reset_work, nvme_rdma_reset_ctrl_work);
1974
1975         ctrl->ctrl.queue_count = opts->nr_io_queues + 1; /* +1 for admin queue */
1976         ctrl->ctrl.sqsize = opts->queue_size - 1;
1977         ctrl->ctrl.kato = opts->kato;
1978
1979         ret = -ENOMEM;
1980         ctrl->queues = kcalloc(ctrl->ctrl.queue_count, sizeof(*ctrl->queues),
1981                                 GFP_KERNEL);
1982         if (!ctrl->queues)
1983                 goto out_free_ctrl;
1984
1985         ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops,
1986                                 0 /* no quirks, we're perfect! */);
1987         if (ret)
1988                 goto out_kfree_queues;
1989
1990         changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING);
1991         WARN_ON_ONCE(!changed);
1992
1993         ret = nvme_rdma_setup_ctrl(ctrl, true);
1994         if (ret)
1995                 goto out_uninit_ctrl;
1996
1997         dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISpcs\n",
1998                 ctrl->ctrl.opts->subsysnqn, &ctrl->addr);
1999
2000         nvme_get_ctrl(&ctrl->ctrl);
2001
2002         mutex_lock(&nvme_rdma_ctrl_mutex);
2003         list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list);
2004         mutex_unlock(&nvme_rdma_ctrl_mutex);
2005
2006         return &ctrl->ctrl;
2007
2008 out_uninit_ctrl:
2009         nvme_uninit_ctrl(&ctrl->ctrl);
2010         nvme_put_ctrl(&ctrl->ctrl);
2011         if (ret > 0)
2012                 ret = -EIO;
2013         return ERR_PTR(ret);
2014 out_kfree_queues:
2015         kfree(ctrl->queues);
2016 out_free_ctrl:
2017         kfree(ctrl);
2018         return ERR_PTR(ret);
2019 }
2020
2021 static struct nvmf_transport_ops nvme_rdma_transport = {
2022         .name           = "rdma",
2023         .module         = THIS_MODULE,
2024         .required_opts  = NVMF_OPT_TRADDR,
2025         .allowed_opts   = NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY |
2026                           NVMF_OPT_HOST_TRADDR | NVMF_OPT_CTRL_LOSS_TMO,
2027         .create_ctrl    = nvme_rdma_create_ctrl,
2028 };
2029
2030 static void nvme_rdma_remove_one(struct ib_device *ib_device, void *client_data)
2031 {
2032         struct nvme_rdma_ctrl *ctrl;
2033         struct nvme_rdma_device *ndev;
2034         bool found = false;
2035
2036         mutex_lock(&device_list_mutex);
2037         list_for_each_entry(ndev, &device_list, entry) {
2038                 if (ndev->dev == ib_device) {
2039                         found = true;
2040                         break;
2041                 }
2042         }
2043         mutex_unlock(&device_list_mutex);
2044
2045         if (!found)
2046                 return;
2047
2048         /* Delete all controllers using this device */
2049         mutex_lock(&nvme_rdma_ctrl_mutex);
2050         list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
2051                 if (ctrl->device->dev != ib_device)
2052                         continue;
2053                 nvme_delete_ctrl(&ctrl->ctrl);
2054         }
2055         mutex_unlock(&nvme_rdma_ctrl_mutex);
2056
2057         flush_workqueue(nvme_delete_wq);
2058 }
2059
2060 static struct ib_client nvme_rdma_ib_client = {
2061         .name   = "nvme_rdma",
2062         .remove = nvme_rdma_remove_one
2063 };
2064
2065 static int __init nvme_rdma_init_module(void)
2066 {
2067         int ret;
2068
2069         ret = ib_register_client(&nvme_rdma_ib_client);
2070         if (ret)
2071                 return ret;
2072
2073         ret = nvmf_register_transport(&nvme_rdma_transport);
2074         if (ret)
2075                 goto err_unreg_client;
2076
2077         return 0;
2078
2079 err_unreg_client:
2080         ib_unregister_client(&nvme_rdma_ib_client);
2081         return ret;
2082 }
2083
2084 static void __exit nvme_rdma_cleanup_module(void)
2085 {
2086         nvmf_unregister_transport(&nvme_rdma_transport);
2087         ib_unregister_client(&nvme_rdma_ib_client);
2088 }
2089
2090 module_init(nvme_rdma_init_module);
2091 module_exit(nvme_rdma_cleanup_module);
2092
2093 MODULE_LICENSE("GPL v2");