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 <linux/err.h>
  19 #include <linux/string.h>
  20 #include <linux/atomic.h>
  21 #include <linux/blk-mq.h>
  22 #include <linux/types.h>
  23 #include <linux/list.h>
  24 #include <linux/mutex.h>
  25 #include <linux/scatterlist.h>
  26 #include <linux/nvme.h>
  27 #include <asm/unaligned.h>
  28
  29 #include <rdma/ib_verbs.h>
  30 #include <rdma/rdma_cm.h>
  31 #include <linux/nvme-rdma.h>
  32
  33 #include "nvme.h"
  34 #include "fabrics.h"
  35
  36
  37 #define NVME_RDMA_CONNECT_TIMEOUT_MS    1000            /* 1 second */
  38
  39 #define NVME_RDMA_MAX_SEGMENT_SIZE      0xffffff        /* 24-bit SGL field */
  40
  41 #define NVME_RDMA_MAX_SEGMENTS          256
  42
  43 #define NVME_RDMA_MAX_INLINE_SEGMENTS   1
  44
  45 static const char *const nvme_rdma_cm_status_strs[] = {
  46         [NVME_RDMA_CM_INVALID_LEN]      = "invalid length",
  47         [NVME_RDMA_CM_INVALID_RECFMT]   = "invalid record format",
  48         [NVME_RDMA_CM_INVALID_QID]      = "invalid queue ID",
  49         [NVME_RDMA_CM_INVALID_HSQSIZE]  = "invalid host SQ size",
  50         [NVME_RDMA_CM_INVALID_HRQSIZE]  = "invalid host RQ size",
  51         [NVME_RDMA_CM_NO_RSC]           = "resource not found",
  52         [NVME_RDMA_CM_INVALID_IRD]      = "invalid IRD",
  53         [NVME_RDMA_CM_INVALID_ORD]      = "Invalid ORD",
  54 };
  55
  56 static const char *nvme_rdma_cm_msg(enum nvme_rdma_cm_status status)
  57 {
  58         size_t index = status;
  59
  60         if (index < ARRAY_SIZE(nvme_rdma_cm_status_strs) &&
  61             nvme_rdma_cm_status_strs[index])
  62                 return nvme_rdma_cm_status_strs[index];
  63         else
  64                 return "unrecognized reason";
  65 };
  66
  67 /*
  68  * We handle AEN commands ourselves and don't even let the
  69  * block layer know about them.
  70  */
  71 #define NVME_RDMA_NR_AEN_COMMANDS      1
  72 #define NVME_RDMA_AQ_BLKMQ_DEPTH       \
  73         (NVMF_AQ_DEPTH - NVME_RDMA_NR_AEN_COMMANDS)
  74
  75 struct nvme_rdma_device {
  76         struct ib_device       *dev;
  77         struct ib_pd           *pd;
  78         struct kref             ref;
  79         struct list_head        entry;
  80 };
  81
  82 struct nvme_rdma_qe {
  83         struct ib_cqe           cqe;
  84         void                    *data;
  85         u64                     dma;
  86 };
  87
  88 struct nvme_rdma_queue;
  89 struct nvme_rdma_request {
  90         struct nvme_request     req;
  91         struct ib_mr            *mr;
  92         struct nvme_rdma_qe     sqe;
  93         struct ib_sge           sge[1 + NVME_RDMA_MAX_INLINE_SEGMENTS];
  94         u32                     num_sge;
  95         int                     nents;
  96         bool                    inline_data;
  97         struct ib_reg_wr        reg_wr;
  98         struct ib_cqe           reg_cqe;
  99         struct nvme_rdma_queue  *queue;
 100         struct sg_table         sg_table;
 101         struct scatterlist      first_sgl[];
 102 };
 103
 104 enum nvme_rdma_queue_flags {
 105         NVME_RDMA_Q_CONNECTED = (1 << 0),
 106         NVME_RDMA_IB_QUEUE_ALLOCATED = (1 << 1),
 107         NVME_RDMA_Q_DELETING = (1 << 2),
 108         NVME_RDMA_Q_LIVE = (1 << 3),
 109 };
 110
 111 struct nvme_rdma_queue {
 112         struct nvme_rdma_qe     *rsp_ring;
 113         u8                      sig_count;
 114         int                     queue_size;
 115         size_t                  cmnd_capsule_len;
 116         struct nvme_rdma_ctrl   *ctrl;
 117         struct nvme_rdma_device *device;
 118         struct ib_cq            *ib_cq;
 119         struct ib_qp            *qp;
 120
 121         unsigned long           flags;
 122         struct rdma_cm_id       *cm_id;
 123         int                     cm_error;
 124         struct completion       cm_done;
 125 };
 126
 127 struct nvme_rdma_ctrl {
 128         /* read and written in the hot path */
 129         spinlock_t              lock;
 130
 131         /* read only in the hot path */
 132         struct nvme_rdma_queue  *queues;
 133         u32                     queue_count;
 134
 135         /* other member variables */
 136         struct blk_mq_tag_set   tag_set;
 137         struct work_struct      delete_work;
 138         struct work_struct      reset_work;
 139         struct work_struct      err_work;
 140
 141         struct nvme_rdma_qe     async_event_sqe;
 142
 143         int                     reconnect_delay;
 144         struct delayed_work     reconnect_work;
 145
 146         struct list_head        list;
 147
 148         struct blk_mq_tag_set   admin_tag_set;
 149         struct nvme_rdma_device *device;
 150
 151         u64                     cap;
 152         u32                     max_fr_pages;
 153
 154         union {
 155                 struct sockaddr addr;
 156                 struct sockaddr_in addr_in;
 157         };
 158
 159         struct nvme_ctrl        ctrl;
 160 };
 161
 162 static inline struct nvme_rdma_ctrl *to_rdma_ctrl(struct nvme_ctrl *ctrl)
 163 {
 164         return container_of(ctrl, struct nvme_rdma_ctrl, ctrl);
 165 }
 166
 167 static LIST_HEAD(device_list);
 168 static DEFINE_MUTEX(device_list_mutex);
 169
 170 static LIST_HEAD(nvme_rdma_ctrl_list);
 171 static DEFINE_MUTEX(nvme_rdma_ctrl_mutex);
 172
 173 static struct workqueue_struct *nvme_rdma_wq;
 174
 175 /*
 176  * Disabling this option makes small I/O goes faster, but is fundamentally
 177  * unsafe.  With it turned off we will have to register a global rkey that
 178  * allows read and write access to all physical memory.
 179  */
 180 static bool register_always = true;
 181 module_param(register_always, bool, 0444);
 182 MODULE_PARM_DESC(register_always,
 183          "Use memory registration even for contiguous memory regions");
 184
 185 static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
 186                 struct rdma_cm_event *event);
 187 static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
 188
 189 /* XXX: really should move to a generic header sooner or later.. */
 190 static inline void put_unaligned_le24(u32 val, u8 *p)
 191 {
 192         *p++ = val;
 193         *p++ = val >> 8;
 194         *p++ = val >> 16;
 195 }
 196
 197 static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue *queue)
 198 {
 199         return queue - queue->ctrl->queues;
 200 }
 201
 202 static inline size_t nvme_rdma_inline_data_size(struct nvme_rdma_queue *queue)
 203 {
 204         return queue->cmnd_capsule_len - sizeof(struct nvme_command);
 205 }
 206
 207 static void nvme_rdma_free_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
 208                 size_t capsule_size, enum dma_data_direction dir)
 209 {
 210         ib_dma_unmap_single(ibdev, qe->dma, capsule_size, dir);
 211         kfree(qe->data);
 212 }
 213
 214 static int nvme_rdma_alloc_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
 215                 size_t capsule_size, enum dma_data_direction dir)
 216 {
 217         qe->data = kzalloc(capsule_size, GFP_KERNEL);
 218         if (!qe->data)
 219                 return -ENOMEM;
 220
 221         qe->dma = ib_dma_map_single(ibdev, qe->data, capsule_size, dir);
 222         if (ib_dma_mapping_error(ibdev, qe->dma)) {
 223                 kfree(qe->data);
 224                 return -ENOMEM;
 225         }
 226
 227         return 0;
 228 }
 229
 230 static void nvme_rdma_free_ring(struct ib_device *ibdev,
 231                 struct nvme_rdma_qe *ring, size_t ib_queue_size,
 232                 size_t capsule_size, enum dma_data_direction dir)
 233 {
 234         int i;
 235
 236         for (i = 0; i < ib_queue_size; i++)
 237                 nvme_rdma_free_qe(ibdev, &ring[i], capsule_size, dir);
 238         kfree(ring);
 239 }
 240
 241 static struct nvme_rdma_qe *nvme_rdma_alloc_ring(struct ib_device *ibdev,
 242                 size_t ib_queue_size, size_t capsule_size,
 243                 enum dma_data_direction dir)
 244 {
 245         struct nvme_rdma_qe *ring;
 246         int i;
 247
 248         ring = kcalloc(ib_queue_size, sizeof(struct nvme_rdma_qe), GFP_KERNEL);
 249         if (!ring)
 250                 return NULL;
 251
 252         for (i = 0; i < ib_queue_size; i++) {
 253                 if (nvme_rdma_alloc_qe(ibdev, &ring[i], capsule_size, dir))
 254                         goto out_free_ring;
 255         }
 256
 257         return ring;
 258
 259 out_free_ring:
 260         nvme_rdma_free_ring(ibdev, ring, i, capsule_size, dir);
 261         return NULL;
 262 }
 263
 264 static void nvme_rdma_qp_event(struct ib_event *event, void *context)
 265 {
 266         pr_debug("QP event %s (%d)\n",
 267                  ib_event_msg(event->event), event->event);
 268
 269 }
 270
 271 static int nvme_rdma_wait_for_cm(struct nvme_rdma_queue *queue)
 272 {
 273         wait_for_completion_interruptible_timeout(&queue->cm_done,
 274                         msecs_to_jiffies(NVME_RDMA_CONNECT_TIMEOUT_MS) + 1);
 275         return queue->cm_error;
 276 }
 277
 278 static int nvme_rdma_create_qp(struct nvme_rdma_queue *queue, const int factor)
 279 {
 280         struct nvme_rdma_device *dev = queue->device;
 281         struct ib_qp_init_attr init_attr;
 282         int ret;
 283
 284         memset(&init_attr, 0, sizeof(init_attr));
 285         init_attr.event_handler = nvme_rdma_qp_event;
 286         /* +1 for drain */
 287         init_attr.cap.max_send_wr = factor * queue->queue_size + 1;
 288         /* +1 for drain */
 289         init_attr.cap.max_recv_wr = queue->queue_size + 1;
 290         init_attr.cap.max_recv_sge = 1;
 291         init_attr.cap.max_send_sge = 1 + NVME_RDMA_MAX_INLINE_SEGMENTS;
 292         init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 293         init_attr.qp_type = IB_QPT_RC;
 294         init_attr.send_cq = queue->ib_cq;
 295         init_attr.recv_cq = queue->ib_cq;
 296
 297         ret = rdma_create_qp(queue->cm_id, dev->pd, &init_attr);
 298
 299         queue->qp = queue->cm_id->qp;
 300         return ret;
 301 }
 302
 303 static int nvme_rdma_reinit_request(void *data, struct request *rq)
 304 {
 305         struct nvme_rdma_ctrl *ctrl = data;
 306         struct nvme_rdma_device *dev = ctrl->device;
 307         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
 308         int ret = 0;
 309
 310         if (!req->mr->need_inval)
 311                 goto out;
 312
 313         ib_dereg_mr(req->mr);
 314
 315         req->mr = ib_alloc_mr(dev->pd, IB_MR_TYPE_MEM_REG,
 316                         ctrl->max_fr_pages);
 317         if (IS_ERR(req->mr)) {
 318                 ret = PTR_ERR(req->mr);
 319                 req->mr = NULL;
 320                 goto out;
 321         }
 322
 323         req->mr->need_inval = false;
 324
 325 out:
 326         return ret;
 327 }
 328
 329 static void __nvme_rdma_exit_request(struct nvme_rdma_ctrl *ctrl,
 330                 struct request *rq, unsigned int queue_idx)
 331 {
 332         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
 333         struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];
 334         struct nvme_rdma_device *dev = queue->device;
 335
 336         if (req->mr)
 337                 ib_dereg_mr(req->mr);
 338
 339         nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command),
 340                         DMA_TO_DEVICE);
 341 }
 342
 343 static void nvme_rdma_exit_request(void *data, struct request *rq,
 344                                 unsigned int hctx_idx, unsigned int rq_idx)
 345 {
 346         return __nvme_rdma_exit_request(data, rq, hctx_idx + 1);
 347 }
 348
 349 static void nvme_rdma_exit_admin_request(void *data, struct request *rq,
 350                                 unsigned int hctx_idx, unsigned int rq_idx)
 351 {
 352         return __nvme_rdma_exit_request(data, rq, 0);
 353 }
 354
 355 static int __nvme_rdma_init_request(struct nvme_rdma_ctrl *ctrl,
 356                 struct request *rq, unsigned int queue_idx)
 357 {
 358         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
 359         struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];
 360         struct nvme_rdma_device *dev = queue->device;
 361         struct ib_device *ibdev = dev->dev;
 362         int ret;
 363
 364         BUG_ON(queue_idx >= ctrl->queue_count);
 365
 366         ret = nvme_rdma_alloc_qe(ibdev, &req->sqe, sizeof(struct nvme_command),
 367                         DMA_TO_DEVICE);
 368         if (ret)
 369                 return ret;
 370
 371         req->mr = ib_alloc_mr(dev->pd, IB_MR_TYPE_MEM_REG,
 372                         ctrl->max_fr_pages);
 373         if (IS_ERR(req->mr)) {
 374                 ret = PTR_ERR(req->mr);
 375                 goto out_free_qe;
 376         }
 377
 378         req->queue = queue;
 379
 380         return 0;
 381
 382 out_free_qe:
 383         nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command),
 384                         DMA_TO_DEVICE);
 385         return -ENOMEM;
 386 }
 387
 388 static int nvme_rdma_init_request(void *data, struct request *rq,
 389                                 unsigned int hctx_idx, unsigned int rq_idx,
 390                                 unsigned int numa_node)
 391 {
 392         return __nvme_rdma_init_request(data, rq, hctx_idx + 1);
 393 }
 394
 395 static int nvme_rdma_init_admin_request(void *data, struct request *rq,
 396                                 unsigned int hctx_idx, unsigned int rq_idx,
 397                                 unsigned int numa_node)
 398 {
 399         return __nvme_rdma_init_request(data, rq, 0);
 400 }
 401
 402 static int nvme_rdma_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
 403                 unsigned int hctx_idx)
 404 {
 405         struct nvme_rdma_ctrl *ctrl = data;
 406         struct nvme_rdma_queue *queue = &ctrl->queues[hctx_idx + 1];
 407
 408         BUG_ON(hctx_idx >= ctrl->queue_count);
 409
 410         hctx->driver_data = queue;
 411         return 0;
 412 }
 413
 414 static int nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
 415                 unsigned int hctx_idx)
 416 {
 417         struct nvme_rdma_ctrl *ctrl = data;
 418         struct nvme_rdma_queue *queue = &ctrl->queues[0];
 419
 420         BUG_ON(hctx_idx != 0);
 421
 422         hctx->driver_data = queue;
 423         return 0;
 424 }
 425
 426 static void nvme_rdma_free_dev(struct kref *ref)
 427 {
 428         struct nvme_rdma_device *ndev =
 429                 container_of(ref, struct nvme_rdma_device, ref);
 430
 431         mutex_lock(&device_list_mutex);
 432         list_del(&ndev->entry);
 433         mutex_unlock(&device_list_mutex);
 434
 435         ib_dealloc_pd(ndev->pd);
 436         kfree(ndev);
 437 }
 438
 439 static void nvme_rdma_dev_put(struct nvme_rdma_device *dev)
 440 {
 441         kref_put(&dev->ref, nvme_rdma_free_dev);
 442 }
 443
 444 static int nvme_rdma_dev_get(struct nvme_rdma_device *dev)
 445 {
 446         return kref_get_unless_zero(&dev->ref);
 447 }
 448
 449 static struct nvme_rdma_device *
 450 nvme_rdma_find_get_device(struct rdma_cm_id *cm_id)
 451 {
 452         struct nvme_rdma_device *ndev;
 453
 454         mutex_lock(&device_list_mutex);
 455         list_for_each_entry(ndev, &device_list, entry) {
 456                 if (ndev->dev->node_guid == cm_id->device->node_guid &&
 457                     nvme_rdma_dev_get(ndev))
 458                         goto out_unlock;
 459         }
 460
 461         ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
 462         if (!ndev)
 463                 goto out_err;
 464
 465         ndev->dev = cm_id->device;
 466         kref_init(&ndev->ref);
 467
 468         ndev->pd = ib_alloc_pd(ndev->dev,
 469                 register_always ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY);
 470         if (IS_ERR(ndev->pd))
 471                 goto out_free_dev;
 472
 473         if (!(ndev->dev->attrs.device_cap_flags &
 474               IB_DEVICE_MEM_MGT_EXTENSIONS)) {
 475                 dev_err(&ndev->dev->dev,
 476                         "Memory registrations not supported.\n");
 477                 goto out_free_pd;
 478         }
 479
 480         list_add(&ndev->entry, &device_list);
 481 out_unlock:
 482         mutex_unlock(&device_list_mutex);
 483         return ndev;
 484
 485 out_free_pd:
 486         ib_dealloc_pd(ndev->pd);
 487 out_free_dev:
 488         kfree(ndev);
 489 out_err:
 490         mutex_unlock(&device_list_mutex);
 491         return NULL;
 492 }
 493
 494 static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue *queue)
 495 {
 496         struct nvme_rdma_device *dev;
 497         struct ib_device *ibdev;
 498
 499         if (!test_and_clear_bit(NVME_RDMA_IB_QUEUE_ALLOCATED, &queue->flags))
 500                 return;
 501
 502         dev = queue->device;
 503         ibdev = dev->dev;
 504         rdma_destroy_qp(queue->cm_id);
 505         ib_free_cq(queue->ib_cq);
 506
 507         nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,
 508                         sizeof(struct nvme_completion), DMA_FROM_DEVICE);
 509
 510         nvme_rdma_dev_put(dev);
 511 }
 512
 513 static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue *queue,
 514                 struct nvme_rdma_device *dev)
 515 {
 516         struct ib_device *ibdev = dev->dev;
 517         const int send_wr_factor = 3;                   /* MR, SEND, INV */
 518         const int cq_factor = send_wr_factor + 1;       /* + RECV */
 519         int comp_vector, idx = nvme_rdma_queue_idx(queue);
 520
 521         int ret;
 522
 523         queue->device = dev;
 524
 525         /*
 526          * The admin queue is barely used once the controller is live, so don't
 527          * bother to spread it out.
 528          */
 529         if (idx == 0)
 530                 comp_vector = 0;
 531         else
 532                 comp_vector = idx % ibdev->num_comp_vectors;
 533
 534
 535         /* +1 for ib_stop_cq */
 536         queue->ib_cq = ib_alloc_cq(dev->dev, queue,
 537                                 cq_factor * queue->queue_size + 1, comp_vector,
 538                                 IB_POLL_SOFTIRQ);
 539         if (IS_ERR(queue->ib_cq)) {
 540                 ret = PTR_ERR(queue->ib_cq);
 541                 goto out;
 542         }
 543
 544         ret = nvme_rdma_create_qp(queue, send_wr_factor);
 545         if (ret)
 546                 goto out_destroy_ib_cq;
 547
 548         queue->rsp_ring = nvme_rdma_alloc_ring(ibdev, queue->queue_size,
 549                         sizeof(struct nvme_completion), DMA_FROM_DEVICE);
 550         if (!queue->rsp_ring) {
 551                 ret = -ENOMEM;
 552                 goto out_destroy_qp;
 553         }
 554         set_bit(NVME_RDMA_IB_QUEUE_ALLOCATED, &queue->flags);
 555
 556         return 0;
 557
 558 out_destroy_qp:
 559         ib_destroy_qp(queue->qp);
 560 out_destroy_ib_cq:
 561         ib_free_cq(queue->ib_cq);
 562 out:
 563         return ret;
 564 }
 565
 566 static int nvme_rdma_init_queue(struct nvme_rdma_ctrl *ctrl,
 567                 int idx, size_t queue_size)
 568 {
 569         struct nvme_rdma_queue *queue;
 570         int ret;
 571
 572         queue = &ctrl->queues[idx];
 573         queue->ctrl = ctrl;
 574         init_completion(&queue->cm_done);
 575
 576         if (idx > 0)
 577                 queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16;
 578         else
 579                 queue->cmnd_capsule_len = sizeof(struct nvme_command);
 580
 581         queue->queue_size = queue_size;
 582
 583         queue->cm_id = rdma_create_id(&init_net, nvme_rdma_cm_handler, queue,
 584                         RDMA_PS_TCP, IB_QPT_RC);
 585         if (IS_ERR(queue->cm_id)) {
 586                 dev_info(ctrl->ctrl.device,
 587                         "failed to create CM ID: %ld\n", PTR_ERR(queue->cm_id));
 588                 return PTR_ERR(queue->cm_id);
 589         }
 590
 591         queue->cm_error = -ETIMEDOUT;
 592         ret = rdma_resolve_addr(queue->cm_id, NULL, &ctrl->addr,
 593                         NVME_RDMA_CONNECT_TIMEOUT_MS);
 594         if (ret) {
 595                 dev_info(ctrl->ctrl.device,
 596                         "rdma_resolve_addr failed (%d).\n", ret);
 597                 goto out_destroy_cm_id;
 598         }
 599
 600         ret = nvme_rdma_wait_for_cm(queue);
 601         if (ret) {
 602                 dev_info(ctrl->ctrl.device,
 603                         "rdma_resolve_addr wait failed (%d).\n", ret);
 604                 goto out_destroy_cm_id;
 605         }
 606
 607         clear_bit(NVME_RDMA_Q_DELETING, &queue->flags);
 608         set_bit(NVME_RDMA_Q_CONNECTED, &queue->flags);
 609
 610         return 0;
 611
 612 out_destroy_cm_id:
 613         nvme_rdma_destroy_queue_ib(queue);
 614         rdma_destroy_id(queue->cm_id);
 615         return ret;
 616 }
 617
 618 static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
 619 {
 620         rdma_disconnect(queue->cm_id);
 621         ib_drain_qp(queue->qp);
 622 }
 623
 624 static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue)
 625 {
 626         nvme_rdma_destroy_queue_ib(queue);
 627         rdma_destroy_id(queue->cm_id);
 628 }
 629
 630 static void nvme_rdma_stop_and_free_queue(struct nvme_rdma_queue *queue)
 631 {
 632         if (test_and_set_bit(NVME_RDMA_Q_DELETING, &queue->flags))
 633                 return;
 634         nvme_rdma_stop_queue(queue);
 635         nvme_rdma_free_queue(queue);
 636 }
 637
 638 static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl *ctrl)
 639 {
 640         int i;
 641
 642         for (i = 1; i < ctrl->queue_count; i++)
 643                 nvme_rdma_stop_and_free_queue(&ctrl->queues[i]);
 644 }
 645
 646 static int nvme_rdma_connect_io_queues(struct nvme_rdma_ctrl *ctrl)
 647 {
 648         int i, ret = 0;
 649
 650         for (i = 1; i < ctrl->queue_count; i++) {
 651                 ret = nvmf_connect_io_queue(&ctrl->ctrl, i);
 652                 if (ret) {
 653                         dev_info(ctrl->ctrl.device,
 654                                 "failed to connect i/o queue: %d\n", ret);
 655                         goto out_free_queues;
 656                 }
 657                 set_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[i].flags);
 658         }
 659
 660         return 0;
 661
 662 out_free_queues:
 663         nvme_rdma_free_io_queues(ctrl);
 664         return ret;
 665 }
 666
 667 static int nvme_rdma_init_io_queues(struct nvme_rdma_ctrl *ctrl)
 668 {
 669         int i, ret;
 670
 671         for (i = 1; i < ctrl->queue_count; i++) {
 672                 ret = nvme_rdma_init_queue(ctrl, i,
 673                                            ctrl->ctrl.opts->queue_size);
 674                 if (ret) {
 675                         dev_info(ctrl->ctrl.device,
 676                                 "failed to initialize i/o queue: %d\n", ret);
 677                         goto out_free_queues;
 678                 }
 679         }
 680
 681         return 0;
 682
 683 out_free_queues:
 684         for (i--; i >= 1; i--)
 685                 nvme_rdma_stop_and_free_queue(&ctrl->queues[i]);
 686
 687         return ret;
 688 }
 689
 690 static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl)
 691 {
 692         nvme_rdma_free_qe(ctrl->queues[0].device->dev, &ctrl->async_event_sqe,
 693                         sizeof(struct nvme_command), DMA_TO_DEVICE);
 694         nvme_rdma_stop_and_free_queue(&ctrl->queues[0]);
 695         blk_cleanup_queue(ctrl->ctrl.admin_q);
 696         blk_mq_free_tag_set(&ctrl->admin_tag_set);
 697         nvme_rdma_dev_put(ctrl->device);
 698 }
 699
 700 static void nvme_rdma_free_ctrl(struct nvme_ctrl *nctrl)
 701 {
 702         struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
 703
 704         if (list_empty(&ctrl->list))
 705                 goto free_ctrl;
 706
 707         mutex_lock(&nvme_rdma_ctrl_mutex);
 708         list_del(&ctrl->list);
 709         mutex_unlock(&nvme_rdma_ctrl_mutex);
 710
 711         kfree(ctrl->queues);
 712         nvmf_free_options(nctrl->opts);
 713 free_ctrl:
 714         kfree(ctrl);
 715 }
 716
 717 static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work)
 718 {
 719         struct nvme_rdma_ctrl *ctrl = container_of(to_delayed_work(work),
 720                         struct nvme_rdma_ctrl, reconnect_work);
 721         bool changed;
 722         int ret;
 723
 724         if (ctrl->queue_count > 1) {
 725                 nvme_rdma_free_io_queues(ctrl);
 726
 727                 ret = blk_mq_reinit_tagset(&ctrl->tag_set);
 728                 if (ret)
 729                         goto requeue;
 730         }
 731
 732         nvme_rdma_stop_and_free_queue(&ctrl->queues[0]);
 733
 734         ret = blk_mq_reinit_tagset(&ctrl->admin_tag_set);
 735         if (ret)
 736                 goto requeue;
 737
 738         ret = nvme_rdma_init_queue(ctrl, 0, NVMF_AQ_DEPTH);
 739         if (ret)
 740                 goto requeue;
 741
 742         blk_mq_start_stopped_hw_queues(ctrl->ctrl.admin_q, true);
 743
 744         ret = nvmf_connect_admin_queue(&ctrl->ctrl);
 745         if (ret)
 746                 goto stop_admin_q;
 747
 748         set_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[0].flags);
 749
 750         ret = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap);
 751         if (ret)
 752                 goto stop_admin_q;
 753
 754         nvme_start_keep_alive(&ctrl->ctrl);
 755
 756         if (ctrl->queue_count > 1) {
 757                 ret = nvme_rdma_init_io_queues(ctrl);
 758                 if (ret)
 759                         goto stop_admin_q;
 760
 761                 ret = nvme_rdma_connect_io_queues(ctrl);
 762                 if (ret)
 763                         goto stop_admin_q;
 764         }
 765
 766         changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
 767         WARN_ON_ONCE(!changed);
 768
 769         if (ctrl->queue_count > 1) {
 770                 nvme_start_queues(&ctrl->ctrl);
 771                 nvme_queue_scan(&ctrl->ctrl);
 772                 nvme_queue_async_events(&ctrl->ctrl);
 773         }
 774
 775         dev_info(ctrl->ctrl.device, "Successfully reconnected\n");
 776
 777         return;
 778
 779 stop_admin_q:
 780         blk_mq_stop_hw_queues(ctrl->ctrl.admin_q);
 781 requeue:
 782         /* Make sure we are not resetting/deleting */
 783         if (ctrl->ctrl.state == NVME_CTRL_RECONNECTING) {
 784                 dev_info(ctrl->ctrl.device,
 785                         "Failed reconnect attempt, requeueing...\n");
 786                 queue_delayed_work(nvme_rdma_wq, &ctrl->reconnect_work,
 787                                         ctrl->reconnect_delay * HZ);
 788         }
 789 }
 790
 791 static void nvme_rdma_error_recovery_work(struct work_struct *work)
 792 {
 793         struct nvme_rdma_ctrl *ctrl = container_of(work,
 794                         struct nvme_rdma_ctrl, err_work);
 795         int i;
 796
 797         nvme_stop_keep_alive(&ctrl->ctrl);
 798
 799         for (i = 0; i < ctrl->queue_count; i++) {
 800                 clear_bit(NVME_RDMA_Q_CONNECTED, &ctrl->queues[i].flags);
 801                 clear_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[i].flags);
 802         }
 803
 804         if (ctrl->queue_count > 1)
 805                 nvme_stop_queues(&ctrl->ctrl);
 806         blk_mq_stop_hw_queues(ctrl->ctrl.admin_q);
 807
 808         /* We must take care of fastfail/requeue all our inflight requests */
 809         if (ctrl->queue_count > 1)
 810                 blk_mq_tagset_busy_iter(&ctrl->tag_set,
 811                                         nvme_cancel_request, &ctrl->ctrl);
 812         blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
 813                                 nvme_cancel_request, &ctrl->ctrl);
 814
 815         dev_info(ctrl->ctrl.device, "reconnecting in %d seconds\n",
 816                 ctrl->reconnect_delay);
 817
 818         queue_delayed_work(nvme_rdma_wq, &ctrl->reconnect_work,
 819                                 ctrl->reconnect_delay * HZ);
 820 }
 821
 822 static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl *ctrl)
 823 {
 824         if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RECONNECTING))
 825                 return;
 826
 827         queue_work(nvme_rdma_wq, &ctrl->err_work);
 828 }
 829
 830 static void nvme_rdma_wr_error(struct ib_cq *cq, struct ib_wc *wc,
 831                 const char *op)
 832 {
 833         struct nvme_rdma_queue *queue = cq->cq_context;
 834         struct nvme_rdma_ctrl *ctrl = queue->ctrl;
 835
 836         if (ctrl->ctrl.state == NVME_CTRL_LIVE)
 837                 dev_info(ctrl->ctrl.device,
 838                              "%s for CQE 0x%p failed with status %s (%d)\n",
 839                              op, wc->wr_cqe,
 840                              ib_wc_status_msg(wc->status), wc->status);
 841         nvme_rdma_error_recovery(ctrl);
 842 }
 843
 844 static void nvme_rdma_memreg_done(struct ib_cq *cq, struct ib_wc *wc)
 845 {
 846         if (unlikely(wc->status != IB_WC_SUCCESS))
 847                 nvme_rdma_wr_error(cq, wc, "MEMREG");
 848 }
 849
 850 static void nvme_rdma_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc)
 851 {
 852         if (unlikely(wc->status != IB_WC_SUCCESS))
 853                 nvme_rdma_wr_error(cq, wc, "LOCAL_INV");
 854 }
 855
 856 static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue,
 857                 struct nvme_rdma_request *req)
 858 {
 859         struct ib_send_wr *bad_wr;
 860         struct ib_send_wr wr = {
 861                 .opcode             = IB_WR_LOCAL_INV,
 862                 .next               = NULL,
 863                 .num_sge            = 0,
 864                 .send_flags         = 0,
 865                 .ex.invalidate_rkey = req->mr->rkey,
 866         };
 867
 868         req->reg_cqe.done = nvme_rdma_inv_rkey_done;
 869         wr.wr_cqe = &req->reg_cqe;
 870
 871         return ib_post_send(queue->qp, &wr, &bad_wr);
 872 }
 873
 874 static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue,
 875                 struct request *rq)
 876 {
 877         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
 878         struct nvme_rdma_ctrl *ctrl = queue->ctrl;
 879         struct nvme_rdma_device *dev = queue->device;
 880         struct ib_device *ibdev = dev->dev;
 881         int res;
 882
 883         if (!blk_rq_bytes(rq))
 884                 return;
 885
 886         if (req->mr->need_inval) {
 887                 res = nvme_rdma_inv_rkey(queue, req);
 888                 if (res < 0) {
 889                         dev_err(ctrl->ctrl.device,
 890                                 "Queueing INV WR for rkey %#x failed (%d)\n",
 891                                 req->mr->rkey, res);
 892                         nvme_rdma_error_recovery(queue->ctrl);
 893                 }
 894         }
 895
 896         ib_dma_unmap_sg(ibdev, req->sg_table.sgl,
 897                         req->nents, rq_data_dir(rq) ==
 898                                     WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 899
 900         nvme_cleanup_cmd(rq);
 901         sg_free_table_chained(&req->sg_table, true);
 902 }
 903
 904 static int nvme_rdma_set_sg_null(struct nvme_command *c)
 905 {
 906         struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
 907
 908         sg->addr = 0;
 909         put_unaligned_le24(0, sg->length);
 910         put_unaligned_le32(0, sg->key);
 911         sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
 912         return 0;
 913 }
 914
 915 static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue *queue,
 916                 struct nvme_rdma_request *req, struct nvme_command *c)
 917 {
 918         struct nvme_sgl_desc *sg = &c->common.dptr.sgl;
 919
 920         req->sge[1].addr = sg_dma_address(req->sg_table.sgl);
 921         req->sge[1].length = sg_dma_len(req->sg_table.sgl);
 922         req->sge[1].lkey = queue->device->pd->local_dma_lkey;
 923
 924         sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff);
 925         sg->length = cpu_to_le32(sg_dma_len(req->sg_table.sgl));
 926         sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET;
 927
 928         req->inline_data = true;
 929         req->num_sge++;
 930         return 0;
 931 }
 932
 933 static int nvme_rdma_map_sg_single(struct nvme_rdma_queue *queue,
 934                 struct nvme_rdma_request *req, struct nvme_command *c)
 935 {
 936         struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
 937
 938         sg->addr = cpu_to_le64(sg_dma_address(req->sg_table.sgl));
 939         put_unaligned_le24(sg_dma_len(req->sg_table.sgl), sg->length);
 940         put_unaligned_le32(queue->device->pd->unsafe_global_rkey, sg->key);
 941         sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
 942         return 0;
 943 }
 944
 945 static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue *queue,
 946                 struct nvme_rdma_request *req, struct nvme_command *c,
 947                 int count)
 948 {
 949         struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
 950         int nr;
 951
 952         nr = ib_map_mr_sg(req->mr, req->sg_table.sgl, count, NULL, PAGE_SIZE);
 953         if (nr < count) {
 954                 if (nr < 0)
 955                         return nr;
 956                 return -EINVAL;
 957         }
 958
 959         ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey));
 960
 961         req->reg_cqe.done = nvme_rdma_memreg_done;
 962         memset(&req->reg_wr, 0, sizeof(req->reg_wr));
 963         req->reg_wr.wr.opcode = IB_WR_REG_MR;
 964         req->reg_wr.wr.wr_cqe = &req->reg_cqe;
 965         req->reg_wr.wr.num_sge = 0;
 966         req->reg_wr.mr = req->mr;
 967         req->reg_wr.key = req->mr->rkey;
 968         req->reg_wr.access = IB_ACCESS_LOCAL_WRITE |
 969                              IB_ACCESS_REMOTE_READ |
 970                              IB_ACCESS_REMOTE_WRITE;
 971
 972         req->mr->need_inval = true;
 973
 974         sg->addr = cpu_to_le64(req->mr->iova);
 975         put_unaligned_le24(req->mr->length, sg->length);
 976         put_unaligned_le32(req->mr->rkey, sg->key);
 977         sg->type = (NVME_KEY_SGL_FMT_DATA_DESC << 4) |
 978                         NVME_SGL_FMT_INVALIDATE;
 979
 980         return 0;
 981 }
 982
 983 static int nvme_rdma_map_data(struct nvme_rdma_queue *queue,
 984                 struct request *rq, unsigned int map_len,
 985                 struct nvme_command *c)
 986 {
 987         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
 988         struct nvme_rdma_device *dev = queue->device;
 989         struct ib_device *ibdev = dev->dev;
 990         int count, ret;
 991
 992         req->num_sge = 1;
 993         req->inline_data = false;
 994         req->mr->need_inval = false;
 995
 996         c->common.flags |= NVME_CMD_SGL_METABUF;
 997
 998         if (!blk_rq_bytes(rq))
 999                 return nvme_rdma_set_sg_null(c);
1000
1001         req->sg_table.sgl = req->first_sgl;
1002         ret = sg_alloc_table_chained(&req->sg_table,
1003                         blk_rq_nr_phys_segments(rq), req->sg_table.sgl);
1004         if (ret)
1005                 return -ENOMEM;
1006
1007         req->nents = blk_rq_map_sg(rq->q, rq, req->sg_table.sgl);
1008
1009         count = ib_dma_map_sg(ibdev, req->sg_table.sgl, req->nents,
1010                     rq_data_dir(rq) == WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
1011         if (unlikely(count <= 0)) {
1012                 sg_free_table_chained(&req->sg_table, true);
1013                 return -EIO;
1014         }
1015
1016         if (count == 1) {
1017                 if (rq_data_dir(rq) == WRITE &&
1018                     map_len <= nvme_rdma_inline_data_size(queue) &&
1019                     nvme_rdma_queue_idx(queue))
1020                         return nvme_rdma_map_sg_inline(queue, req, c);
1021
1022                 if (dev->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)
1023                         return nvme_rdma_map_sg_single(queue, req, c);
1024         }
1025
1026         return nvme_rdma_map_sg_fr(queue, req, c, count);
1027 }
1028
1029 static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
1030 {
1031         if (unlikely(wc->status != IB_WC_SUCCESS))
1032                 nvme_rdma_wr_error(cq, wc, "SEND");
1033 }
1034
1035 static int nvme_rdma_post_send(struct nvme_rdma_queue *queue,
1036                 struct nvme_rdma_qe *qe, struct ib_sge *sge, u32 num_sge,
1037                 struct ib_send_wr *first, bool flush)
1038 {
1039         struct ib_send_wr wr, *bad_wr;
1040         int ret;
1041
1042         sge->addr   = qe->dma;
1043         sge->length = sizeof(struct nvme_command),
1044         sge->lkey   = queue->device->pd->local_dma_lkey;
1045
1046         qe->cqe.done = nvme_rdma_send_done;
1047
1048         wr.next       = NULL;
1049         wr.wr_cqe     = &qe->cqe;
1050         wr.sg_list    = sge;
1051         wr.num_sge    = num_sge;
1052         wr.opcode     = IB_WR_SEND;
1053         wr.send_flags = 0;
1054
1055         /*
1056          * Unsignalled send completions are another giant desaster in the
1057          * IB Verbs spec:  If we don't regularly post signalled sends
1058          * the send queue will fill up and only a QP reset will rescue us.
1059          * Would have been way to obvious to handle this in hardware or
1060          * at least the RDMA stack..
1061          *
1062          * This messy and racy code sniplet is copy and pasted from the iSER
1063          * initiator, and the magic '32' comes from there as well.
1064          *
1065          * Always signal the flushes. The magic request used for the flush
1066          * sequencer is not allocated in our driver's tagset and it's
1067          * triggered to be freed by blk_cleanup_queue(). So we need to
1068          * always mark it as signaled to ensure that the "wr_cqe", which is
1069          * embeded in request's payload, is not freed when __ib_process_cq()
1070          * calls wr_cqe->done().
1071          */
1072         if ((++queue->sig_count % 32) == 0 || flush)
1073                 wr.send_flags |= IB_SEND_SIGNALED;
1074
1075         if (first)
1076                 first->next = &wr;
1077         else
1078                 first = &wr;
1079
1080         ret = ib_post_send(queue->qp, first, &bad_wr);
1081         if (ret) {
1082                 dev_err(queue->ctrl->ctrl.device,
1083                              "%s failed with error code %d\n", __func__, ret);
1084         }
1085         return ret;
1086 }
1087
1088 static int nvme_rdma_post_recv(struct nvme_rdma_queue *queue,
1089                 struct nvme_rdma_qe *qe)
1090 {
1091         struct ib_recv_wr wr, *bad_wr;
1092         struct ib_sge list;
1093         int ret;
1094
1095         list.addr   = qe->dma;
1096         list.length = sizeof(struct nvme_completion);
1097         list.lkey   = queue->device->pd->local_dma_lkey;
1098
1099         qe->cqe.done = nvme_rdma_recv_done;
1100
1101         wr.next     = NULL;
1102         wr.wr_cqe   = &qe->cqe;
1103         wr.sg_list  = &list;
1104         wr.num_sge  = 1;
1105
1106         ret = ib_post_recv(queue->qp, &wr, &bad_wr);
1107         if (ret) {
1108                 dev_err(queue->ctrl->ctrl.device,
1109                         "%s failed with error code %d\n", __func__, ret);
1110         }
1111         return ret;
1112 }
1113
1114 static struct blk_mq_tags *nvme_rdma_tagset(struct nvme_rdma_queue *queue)
1115 {
1116         u32 queue_idx = nvme_rdma_queue_idx(queue);
1117
1118         if (queue_idx == 0)
1119                 return queue->ctrl->admin_tag_set.tags[queue_idx];
1120         return queue->ctrl->tag_set.tags[queue_idx - 1];
1121 }
1122
1123 static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg, int aer_idx)
1124 {
1125         struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(arg);
1126         struct nvme_rdma_queue *queue = &ctrl->queues[0];
1127         struct ib_device *dev = queue->device->dev;
1128         struct nvme_rdma_qe *sqe = &ctrl->async_event_sqe;
1129         struct nvme_command *cmd = sqe->data;
1130         struct ib_sge sge;
1131         int ret;
1132
1133         if (WARN_ON_ONCE(aer_idx != 0))
1134                 return;
1135
1136         ib_dma_sync_single_for_cpu(dev, sqe->dma, sizeof(*cmd), DMA_TO_DEVICE);
1137
1138         memset(cmd, 0, sizeof(*cmd));
1139         cmd->common.opcode = nvme_admin_async_event;
1140         cmd->common.command_id = NVME_RDMA_AQ_BLKMQ_DEPTH;
1141         cmd->common.flags |= NVME_CMD_SGL_METABUF;
1142         nvme_rdma_set_sg_null(cmd);
1143
1144         ib_dma_sync_single_for_device(dev, sqe->dma, sizeof(*cmd),
1145                         DMA_TO_DEVICE);
1146
1147         ret = nvme_rdma_post_send(queue, sqe, &sge, 1, NULL, false);
1148         WARN_ON_ONCE(ret);
1149 }
1150
1151 static int nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue,
1152                 struct nvme_completion *cqe, struct ib_wc *wc, int tag)
1153 {
1154         struct request *rq;
1155         struct nvme_rdma_request *req;
1156         int ret = 0;
1157
1158         rq = blk_mq_tag_to_rq(nvme_rdma_tagset(queue), cqe->command_id);
1159         if (!rq) {
1160                 dev_err(queue->ctrl->ctrl.device,
1161                         "tag 0x%x on QP %#x not found\n",
1162                         cqe->command_id, queue->qp->qp_num);
1163                 nvme_rdma_error_recovery(queue->ctrl);
1164                 return ret;
1165         }
1166         req = blk_mq_rq_to_pdu(rq);
1167
1168         if (rq->tag == tag)
1169                 ret = 1;
1170
1171         if ((wc->wc_flags & IB_WC_WITH_INVALIDATE) &&
1172             wc->ex.invalidate_rkey == req->mr->rkey)
1173                 req->mr->need_inval = false;
1174
1175         req->req.result = cqe->result;
1176         blk_mq_complete_request(rq, le16_to_cpu(cqe->status) >> 1);
1177         return ret;
1178 }
1179
1180 static int __nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc, int tag)
1181 {
1182         struct nvme_rdma_qe *qe =
1183                 container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
1184         struct nvme_rdma_queue *queue = cq->cq_context;
1185         struct ib_device *ibdev = queue->device->dev;
1186         struct nvme_completion *cqe = qe->data;
1187         const size_t len = sizeof(struct nvme_completion);
1188         int ret = 0;
1189
1190         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1191                 nvme_rdma_wr_error(cq, wc, "RECV");
1192                 return 0;
1193         }
1194
1195         ib_dma_sync_single_for_cpu(ibdev, qe->dma, len, DMA_FROM_DEVICE);
1196         /*
1197          * AEN requests are special as they don't time out and can
1198          * survive any kind of queue freeze and often don't respond to
1199          * aborts.  We don't even bother to allocate a struct request
1200          * for them but rather special case them here.
1201          */
1202         if (unlikely(nvme_rdma_queue_idx(queue) == 0 &&
1203                         cqe->command_id >= NVME_RDMA_AQ_BLKMQ_DEPTH))
1204                 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
1205                                 &cqe->result);
1206         else
1207                 ret = nvme_rdma_process_nvme_rsp(queue, cqe, wc, tag);
1208         ib_dma_sync_single_for_device(ibdev, qe->dma, len, DMA_FROM_DEVICE);
1209
1210         nvme_rdma_post_recv(queue, qe);
1211         return ret;
1212 }
1213
1214 static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1215 {
1216         __nvme_rdma_recv_done(cq, wc, -1);
1217 }
1218
1219 static int nvme_rdma_conn_established(struct nvme_rdma_queue *queue)
1220 {
1221         int ret, i;
1222
1223         for (i = 0; i < queue->queue_size; i++) {
1224                 ret = nvme_rdma_post_recv(queue, &queue->rsp_ring[i]);
1225                 if (ret)
1226                         goto out_destroy_queue_ib;
1227         }
1228
1229         return 0;
1230
1231 out_destroy_queue_ib:
1232         nvme_rdma_destroy_queue_ib(queue);
1233         return ret;
1234 }
1235
1236 static int nvme_rdma_conn_rejected(struct nvme_rdma_queue *queue,
1237                 struct rdma_cm_event *ev)
1238 {
1239         struct rdma_cm_id *cm_id = queue->cm_id;
1240         int status = ev->status;
1241         const char *rej_msg;
1242         const struct nvme_rdma_cm_rej *rej_data;
1243         u8 rej_data_len;
1244
1245         rej_msg = rdma_reject_msg(cm_id, status);
1246         rej_data = rdma_consumer_reject_data(cm_id, ev, &rej_data_len);
1247
1248         if (rej_data && rej_data_len >= sizeof(u16)) {
1249                 u16 sts = le16_to_cpu(rej_data->sts);
1250
1251                 dev_err(queue->ctrl->ctrl.device,
1252                       "Connect rejected: status %d (%s) nvme status %d (%s).\n",
1253                       status, rej_msg, sts, nvme_rdma_cm_msg(sts));
1254         } else {
1255                 dev_err(queue->ctrl->ctrl.device,
1256                         "Connect rejected: status %d (%s).\n", status, rej_msg);
1257         }
1258
1259         return -ECONNRESET;
1260 }
1261
1262 static int nvme_rdma_addr_resolved(struct nvme_rdma_queue *queue)
1263 {
1264         struct nvme_rdma_device *dev;
1265         int ret;
1266
1267         dev = nvme_rdma_find_get_device(queue->cm_id);
1268         if (!dev) {
1269                 dev_err(queue->cm_id->device->dma_device,
1270                         "no client data found!\n");
1271                 return -ECONNREFUSED;
1272         }
1273
1274         ret = nvme_rdma_create_queue_ib(queue, dev);
1275         if (ret) {
1276                 nvme_rdma_dev_put(dev);
1277                 goto out;
1278         }
1279
1280         ret = rdma_resolve_route(queue->cm_id, NVME_RDMA_CONNECT_TIMEOUT_MS);
1281         if (ret) {
1282                 dev_err(queue->ctrl->ctrl.device,
1283                         "rdma_resolve_route failed (%d).\n",
1284                         queue->cm_error);
1285                 goto out_destroy_queue;
1286         }
1287
1288         return 0;
1289
1290 out_destroy_queue:
1291         nvme_rdma_destroy_queue_ib(queue);
1292 out:
1293         return ret;
1294 }
1295
1296 static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue)
1297 {
1298         struct nvme_rdma_ctrl *ctrl = queue->ctrl;
1299         struct rdma_conn_param param = { };
1300         struct nvme_rdma_cm_req priv = { };
1301         int ret;
1302
1303         param.qp_num = queue->qp->qp_num;
1304         param.flow_control = 1;
1305
1306         param.responder_resources = queue->device->dev->attrs.max_qp_rd_atom;
1307         /* maximum retry count */
1308         param.retry_count = 7;
1309         param.rnr_retry_count = 7;
1310         param.private_data = &priv;
1311         param.private_data_len = sizeof(priv);
1312
1313         priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1314         priv.qid = cpu_to_le16(nvme_rdma_queue_idx(queue));
1315         /*
1316          * set the admin queue depth to the minimum size
1317          * specified by the Fabrics standard.
1318          */
1319         if (priv.qid == 0) {
1320                 priv.hrqsize = cpu_to_le16(NVMF_AQ_DEPTH);
1321                 priv.hsqsize = cpu_to_le16(NVMF_AQ_DEPTH - 1);
1322         } else {
1323                 /*
1324                  * current interpretation of the fabrics spec
1325                  * is at minimum you make hrqsize sqsize+1, or a
1326                  * 1's based representation of sqsize.
1327                  */
1328                 priv.hrqsize = cpu_to_le16(queue->queue_size);
1329                 priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize);
1330         }
1331
1332         ret = rdma_connect(queue->cm_id, &param);
1333         if (ret) {
1334                 dev_err(ctrl->ctrl.device,
1335                         "rdma_connect failed (%d).\n", ret);
1336                 goto out_destroy_queue_ib;
1337         }
1338
1339         return 0;
1340
1341 out_destroy_queue_ib:
1342         nvme_rdma_destroy_queue_ib(queue);
1343         return ret;
1344 }
1345
1346 static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
1347                 struct rdma_cm_event *ev)
1348 {
1349         struct nvme_rdma_queue *queue = cm_id->context;
1350         int cm_error = 0;
1351
1352         dev_dbg(queue->ctrl->ctrl.device, "%s (%d): status %d id %p\n",
1353                 rdma_event_msg(ev->event), ev->event,
1354                 ev->status, cm_id);
1355
1356         switch (ev->event) {
1357         case RDMA_CM_EVENT_ADDR_RESOLVED:
1358                 cm_error = nvme_rdma_addr_resolved(queue);
1359                 break;
1360         case RDMA_CM_EVENT_ROUTE_RESOLVED:
1361                 cm_error = nvme_rdma_route_resolved(queue);
1362                 break;
1363         case RDMA_CM_EVENT_ESTABLISHED:
1364                 queue->cm_error = nvme_rdma_conn_established(queue);
1365                 /* complete cm_done regardless of success/failure */
1366                 complete(&queue->cm_done);
1367                 return 0;
1368         case RDMA_CM_EVENT_REJECTED:
1369                 cm_error = nvme_rdma_conn_rejected(queue, ev);
1370                 break;
1371         case RDMA_CM_EVENT_ADDR_ERROR:
1372         case RDMA_CM_EVENT_ROUTE_ERROR:
1373         case RDMA_CM_EVENT_CONNECT_ERROR:
1374         case RDMA_CM_EVENT_UNREACHABLE:
1375                 dev_dbg(queue->ctrl->ctrl.device,
1376                         "CM error event %d\n", ev->event);
1377                 cm_error = -ECONNRESET;
1378                 break;
1379         case RDMA_CM_EVENT_DISCONNECTED:
1380         case RDMA_CM_EVENT_ADDR_CHANGE:
1381         case RDMA_CM_EVENT_TIMEWAIT_EXIT:
1382                 dev_dbg(queue->ctrl->ctrl.device,
1383                         "disconnect received - connection closed\n");
1384                 nvme_rdma_error_recovery(queue->ctrl);
1385                 break;
1386         case RDMA_CM_EVENT_DEVICE_REMOVAL:
1387                 /* device removal is handled via the ib_client API */
1388                 break;
1389         default:
1390                 dev_err(queue->ctrl->ctrl.device,
1391                         "Unexpected RDMA CM event (%d)\n", ev->event);
1392                 nvme_rdma_error_recovery(queue->ctrl);
1393                 break;
1394         }
1395
1396         if (cm_error) {
1397                 queue->cm_error = cm_error;
1398                 complete(&queue->cm_done);
1399         }
1400
1401         return 0;
1402 }
1403
1404 static enum blk_eh_timer_return
1405 nvme_rdma_timeout(struct request *rq, bool reserved)
1406 {
1407         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1408
1409         /* queue error recovery */
1410         nvme_rdma_error_recovery(req->queue->ctrl);
1411
1412         /* fail with DNR on cmd timeout */
1413         rq->errors = NVME_SC_ABORT_REQ | NVME_SC_DNR;
1414
1415         return BLK_EH_HANDLED;
1416 }
1417
1418 /*
1419  * We cannot accept any other command until the Connect command has completed.
1420  */
1421 static inline bool nvme_rdma_queue_is_ready(struct nvme_rdma_queue *queue,
1422                 struct request *rq)
1423 {
1424         if (unlikely(!test_bit(NVME_RDMA_Q_LIVE, &queue->flags))) {
1425                 struct nvme_command *cmd = nvme_req(rq)->cmd;
1426
1427                 if (rq->cmd_type != REQ_TYPE_DRV_PRIV ||
1428                     cmd->common.opcode != nvme_fabrics_command ||
1429                     cmd->fabrics.fctype != nvme_fabrics_type_connect)
1430                         return false;
1431         }
1432
1433         return true;
1434 }
1435
1436 static int nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
1437                 const struct blk_mq_queue_data *bd)
1438 {
1439         struct nvme_ns *ns = hctx->queue->queuedata;
1440         struct nvme_rdma_queue *queue = hctx->driver_data;
1441         struct request *rq = bd->rq;
1442         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1443         struct nvme_rdma_qe *sqe = &req->sqe;
1444         struct nvme_command *c = sqe->data;
1445         bool flush = false;
1446         struct ib_device *dev;
1447         unsigned int map_len;
1448         int ret;
1449
1450         WARN_ON_ONCE(rq->tag < 0);
1451
1452         if (!nvme_rdma_queue_is_ready(queue, rq))
1453                 return BLK_MQ_RQ_QUEUE_BUSY;
1454
1455         dev = queue->device->dev;
1456         ib_dma_sync_single_for_cpu(dev, sqe->dma,
1457                         sizeof(struct nvme_command), DMA_TO_DEVICE);
1458
1459         ret = nvme_setup_cmd(ns, rq, c);
1460         if (ret != BLK_MQ_RQ_QUEUE_OK)
1461                 return ret;
1462
1463         blk_mq_start_request(rq);
1464
1465         map_len = nvme_map_len(rq);
1466         ret = nvme_rdma_map_data(queue, rq, map_len, c);
1467         if (ret < 0) {
1468                 dev_err(queue->ctrl->ctrl.device,
1469                              "Failed to map data (%d)\n", ret);
1470                 nvme_cleanup_cmd(rq);
1471                 goto err;
1472         }
1473
1474         ib_dma_sync_single_for_device(dev, sqe->dma,
1475                         sizeof(struct nvme_command), DMA_TO_DEVICE);
1476
1477         if (rq->cmd_type == REQ_TYPE_FS && req_op(rq) == REQ_OP_FLUSH)
1478                 flush = true;
1479         ret = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge,
1480                         req->mr->need_inval ? &req->reg_wr.wr : NULL, flush);
1481         if (ret) {
1482                 nvme_rdma_unmap_data(queue, rq);
1483                 goto err;
1484         }
1485
1486         return BLK_MQ_RQ_QUEUE_OK;
1487 err:
1488         return (ret == -ENOMEM || ret == -EAGAIN) ?
1489                 BLK_MQ_RQ_QUEUE_BUSY : BLK_MQ_RQ_QUEUE_ERROR;
1490 }
1491
1492 static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag)
1493 {
1494         struct nvme_rdma_queue *queue = hctx->driver_data;
1495         struct ib_cq *cq = queue->ib_cq;
1496         struct ib_wc wc;
1497         int found = 0;
1498
1499         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1500         while (ib_poll_cq(cq, 1, &wc) > 0) {
1501                 struct ib_cqe *cqe = wc.wr_cqe;
1502
1503                 if (cqe) {
1504                         if (cqe->done == nvme_rdma_recv_done)
1505                                 found |= __nvme_rdma_recv_done(cq, &wc, tag);
1506                         else
1507                                 cqe->done(cq, &wc);
1508                 }
1509         }
1510
1511         return found;
1512 }
1513
1514 static void nvme_rdma_complete_rq(struct request *rq)
1515 {
1516         struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1517         struct nvme_rdma_queue *queue = req->queue;
1518         int error = 0;
1519
1520         nvme_rdma_unmap_data(queue, rq);
1521
1522         if (unlikely(rq->errors)) {
1523                 if (nvme_req_needs_retry(rq, rq->errors)) {
1524                         nvme_requeue_req(rq);
1525                         return;
1526                 }
1527
1528                 if (rq->cmd_type == REQ_TYPE_DRV_PRIV)
1529                         error = rq->errors;
1530                 else
1531                         error = nvme_error_status(rq->errors);
1532         }
1533
1534         blk_mq_end_request(rq, error);
1535 }
1536
1537 static struct blk_mq_ops nvme_rdma_mq_ops = {
1538         .queue_rq       = nvme_rdma_queue_rq,
1539         .complete       = nvme_rdma_complete_rq,
1540         .init_request   = nvme_rdma_init_request,
1541         .exit_request   = nvme_rdma_exit_request,
1542         .reinit_request = nvme_rdma_reinit_request,
1543         .init_hctx      = nvme_rdma_init_hctx,
1544         .poll           = nvme_rdma_poll,
1545         .timeout        = nvme_rdma_timeout,
1546 };
1547
1548 static struct blk_mq_ops nvme_rdma_admin_mq_ops = {
1549         .queue_rq       = nvme_rdma_queue_rq,
1550         .complete       = nvme_rdma_complete_rq,
1551         .init_request   = nvme_rdma_init_admin_request,
1552         .exit_request   = nvme_rdma_exit_admin_request,
1553         .reinit_request = nvme_rdma_reinit_request,
1554         .init_hctx      = nvme_rdma_init_admin_hctx,
1555         .timeout        = nvme_rdma_timeout,
1556 };
1557
1558 static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl)
1559 {
1560         int error;
1561
1562         error = nvme_rdma_init_queue(ctrl, 0, NVMF_AQ_DEPTH);
1563         if (error)
1564                 return error;
1565
1566         ctrl->device = ctrl->queues[0].device;
1567
1568         /*
1569          * We need a reference on the device as long as the tag_set is alive,
1570          * as the MRs in the request structures need a valid ib_device.
1571          */
1572         error = -EINVAL;
1573         if (!nvme_rdma_dev_get(ctrl->device))
1574                 goto out_free_queue;
1575
1576         ctrl->max_fr_pages = min_t(u32, NVME_RDMA_MAX_SEGMENTS,
1577                 ctrl->device->dev->attrs.max_fast_reg_page_list_len);
1578
1579         memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set));
1580         ctrl->admin_tag_set.ops = &nvme_rdma_admin_mq_ops;
1581         ctrl->admin_tag_set.queue_depth = NVME_RDMA_AQ_BLKMQ_DEPTH;
1582         ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */
1583         ctrl->admin_tag_set.numa_node = NUMA_NO_NODE;
1584         ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_rdma_request) +
1585                 SG_CHUNK_SIZE * sizeof(struct scatterlist);
1586         ctrl->admin_tag_set.driver_data = ctrl;
1587         ctrl->admin_tag_set.nr_hw_queues = 1;
1588         ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT;
1589
1590         error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set);
1591         if (error)
1592                 goto out_put_dev;
1593
1594         ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
1595         if (IS_ERR(ctrl->ctrl.admin_q)) {
1596                 error = PTR_ERR(ctrl->ctrl.admin_q);
1597                 goto out_free_tagset;
1598         }
1599
1600         error = nvmf_connect_admin_queue(&ctrl->ctrl);
1601         if (error)
1602                 goto out_cleanup_queue;
1603
1604         set_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[0].flags);
1605
1606         error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->cap);
1607         if (error) {
1608                 dev_err(ctrl->ctrl.device,
1609                         "prop_get NVME_REG_CAP failed\n");
1610                 goto out_cleanup_queue;
1611         }
1612
1613         ctrl->ctrl.sqsize =
1614                 min_t(int, NVME_CAP_MQES(ctrl->cap) + 1, ctrl->ctrl.sqsize);
1615
1616         error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap);
1617         if (error)
1618                 goto out_cleanup_queue;
1619
1620         ctrl->ctrl.max_hw_sectors =
1621                 (ctrl->max_fr_pages - 1) << (PAGE_SHIFT - 9);
1622
1623         error = nvme_init_identify(&ctrl->ctrl);
1624         if (error)
1625                 goto out_cleanup_queue;
1626
1627         error = nvme_rdma_alloc_qe(ctrl->queues[0].device->dev,
1628                         &ctrl->async_event_sqe, sizeof(struct nvme_command),
1629                         DMA_TO_DEVICE);
1630         if (error)
1631                 goto out_cleanup_queue;
1632
1633         nvme_start_keep_alive(&ctrl->ctrl);
1634
1635         return 0;
1636
1637 out_cleanup_queue:
1638         blk_cleanup_queue(ctrl->ctrl.admin_q);
1639 out_free_tagset:
1640         /* disconnect and drain the queue before freeing the tagset */
1641         nvme_rdma_stop_queue(&ctrl->queues[0]);
1642         blk_mq_free_tag_set(&ctrl->admin_tag_set);
1643 out_put_dev:
1644         nvme_rdma_dev_put(ctrl->device);
1645 out_free_queue:
1646         nvme_rdma_free_queue(&ctrl->queues[0]);
1647         return error;
1648 }
1649
1650 static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl)
1651 {
1652         nvme_stop_keep_alive(&ctrl->ctrl);
1653         cancel_work_sync(&ctrl->err_work);
1654         cancel_delayed_work_sync(&ctrl->reconnect_work);
1655
1656         if (ctrl->queue_count > 1) {
1657                 nvme_stop_queues(&ctrl->ctrl);
1658                 blk_mq_tagset_busy_iter(&ctrl->tag_set,
1659                                         nvme_cancel_request, &ctrl->ctrl);
1660                 nvme_rdma_free_io_queues(ctrl);
1661         }
1662
1663         if (test_bit(NVME_RDMA_Q_CONNECTED, &ctrl->queues[0].flags))
1664                 nvme_shutdown_ctrl(&ctrl->ctrl);
1665
1666         blk_mq_stop_hw_queues(ctrl->ctrl.admin_q);
1667         blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
1668                                 nvme_cancel_request, &ctrl->ctrl);
1669         nvme_rdma_destroy_admin_queue(ctrl);
1670 }
1671
1672 static void __nvme_rdma_remove_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
1673 {
1674         nvme_uninit_ctrl(&ctrl->ctrl);
1675         if (shutdown)
1676                 nvme_rdma_shutdown_ctrl(ctrl);
1677
1678         if (ctrl->ctrl.tagset) {
1679                 blk_cleanup_queue(ctrl->ctrl.connect_q);
1680                 blk_mq_free_tag_set(&ctrl->tag_set);
1681                 nvme_rdma_dev_put(ctrl->device);
1682         }
1683
1684         nvme_put_ctrl(&ctrl->ctrl);
1685 }
1686
1687 static void nvme_rdma_del_ctrl_work(struct work_struct *work)
1688 {
1689         struct nvme_rdma_ctrl *ctrl = container_of(work,
1690                                 struct nvme_rdma_ctrl, delete_work);
1691
1692         __nvme_rdma_remove_ctrl(ctrl, true);
1693 }
1694
1695 static int __nvme_rdma_del_ctrl(struct nvme_rdma_ctrl *ctrl)
1696 {
1697         if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING))
1698                 return -EBUSY;
1699
1700         if (!queue_work(nvme_rdma_wq, &ctrl->delete_work))
1701                 return -EBUSY;
1702
1703         return 0;
1704 }
1705
1706 static int nvme_rdma_del_ctrl(struct nvme_ctrl *nctrl)
1707 {
1708         struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
1709         int ret = 0;
1710
1711         /*
1712          * Keep a reference until all work is flushed since
1713          * __nvme_rdma_del_ctrl can free the ctrl mem
1714          */
1715         if (!kref_get_unless_zero(&ctrl->ctrl.kref))
1716                 return -EBUSY;
1717         ret = __nvme_rdma_del_ctrl(ctrl);
1718         if (!ret)
1719                 flush_work(&ctrl->delete_work);
1720         nvme_put_ctrl(&ctrl->ctrl);
1721         return ret;
1722 }
1723
1724 static void nvme_rdma_remove_ctrl_work(struct work_struct *work)
1725 {
1726         struct nvme_rdma_ctrl *ctrl = container_of(work,
1727                                 struct nvme_rdma_ctrl, delete_work);
1728
1729         __nvme_rdma_remove_ctrl(ctrl, false);
1730 }
1731
1732 static void nvme_rdma_reset_ctrl_work(struct work_struct *work)
1733 {
1734         struct nvme_rdma_ctrl *ctrl = container_of(work,
1735                                         struct nvme_rdma_ctrl, reset_work);
1736         int ret;
1737         bool changed;
1738
1739         nvme_rdma_shutdown_ctrl(ctrl);
1740
1741         ret = nvme_rdma_configure_admin_queue(ctrl);
1742         if (ret) {
1743                 /* ctrl is already shutdown, just remove the ctrl */
1744                 INIT_WORK(&ctrl->delete_work, nvme_rdma_remove_ctrl_work);
1745                 goto del_dead_ctrl;
1746         }
1747
1748         if (ctrl->queue_count > 1) {
1749                 ret = blk_mq_reinit_tagset(&ctrl->tag_set);
1750                 if (ret)
1751                         goto del_dead_ctrl;
1752
1753                 ret = nvme_rdma_init_io_queues(ctrl);
1754                 if (ret)
1755                         goto del_dead_ctrl;
1756
1757                 ret = nvme_rdma_connect_io_queues(ctrl);
1758                 if (ret)
1759                         goto del_dead_ctrl;
1760         }
1761
1762         changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
1763         WARN_ON_ONCE(!changed);
1764
1765         if (ctrl->queue_count > 1) {
1766                 nvme_start_queues(&ctrl->ctrl);
1767                 nvme_queue_scan(&ctrl->ctrl);
1768                 nvme_queue_async_events(&ctrl->ctrl);
1769         }
1770
1771         return;
1772
1773 del_dead_ctrl:
1774         /* Deleting this dead controller... */
1775         dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
1776         WARN_ON(!queue_work(nvme_rdma_wq, &ctrl->delete_work));
1777 }
1778
1779 static int nvme_rdma_reset_ctrl(struct nvme_ctrl *nctrl)
1780 {
1781         struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
1782
1783         if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING))
1784                 return -EBUSY;
1785
1786         if (!queue_work(nvme_rdma_wq, &ctrl->reset_work))
1787                 return -EBUSY;
1788
1789         flush_work(&ctrl->reset_work);
1790
1791         return 0;
1792 }
1793
1794 static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {
1795         .name                   = "rdma",
1796         .module                 = THIS_MODULE,
1797         .is_fabrics             = true,
1798         .reg_read32             = nvmf_reg_read32,
1799         .reg_read64             = nvmf_reg_read64,
1800         .reg_write32            = nvmf_reg_write32,
1801         .reset_ctrl             = nvme_rdma_reset_ctrl,
1802         .free_ctrl              = nvme_rdma_free_ctrl,
1803         .submit_async_event     = nvme_rdma_submit_async_event,
1804         .delete_ctrl            = nvme_rdma_del_ctrl,
1805         .get_subsysnqn          = nvmf_get_subsysnqn,
1806         .get_address            = nvmf_get_address,
1807 };
1808
1809 static int nvme_rdma_create_io_queues(struct nvme_rdma_ctrl *ctrl)
1810 {
1811         struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
1812         int ret;
1813
1814         ret = nvme_set_queue_count(&ctrl->ctrl, &opts->nr_io_queues);
1815         if (ret)
1816                 return ret;
1817
1818         ctrl->queue_count = opts->nr_io_queues + 1;
1819         if (ctrl->queue_count < 2)
1820                 return 0;
1821
1822         dev_info(ctrl->ctrl.device,
1823                 "creating %d I/O queues.\n", opts->nr_io_queues);
1824
1825         ret = nvme_rdma_init_io_queues(ctrl);
1826         if (ret)
1827                 return ret;
1828
1829         /*
1830          * We need a reference on the device as long as the tag_set is alive,
1831          * as the MRs in the request structures need a valid ib_device.
1832          */
1833         ret = -EINVAL;
1834         if (!nvme_rdma_dev_get(ctrl->device))
1835                 goto out_free_io_queues;
1836
1837         memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set));
1838         ctrl->tag_set.ops = &nvme_rdma_mq_ops;
1839         ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size;
1840         ctrl->tag_set.reserved_tags = 1; /* fabric connect */
1841         ctrl->tag_set.numa_node = NUMA_NO_NODE;
1842         ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
1843         ctrl->tag_set.cmd_size = sizeof(struct nvme_rdma_request) +
1844                 SG_CHUNK_SIZE * sizeof(struct scatterlist);
1845         ctrl->tag_set.driver_data = ctrl;
1846         ctrl->tag_set.nr_hw_queues = ctrl->queue_count - 1;
1847         ctrl->tag_set.timeout = NVME_IO_TIMEOUT;
1848
1849         ret = blk_mq_alloc_tag_set(&ctrl->tag_set);
1850         if (ret)
1851                 goto out_put_dev;
1852         ctrl->ctrl.tagset = &ctrl->tag_set;
1853
1854         ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
1855         if (IS_ERR(ctrl->ctrl.connect_q)) {
1856                 ret = PTR_ERR(ctrl->ctrl.connect_q);
1857                 goto out_free_tag_set;
1858         }
1859
1860         ret = nvme_rdma_connect_io_queues(ctrl);
1861         if (ret)
1862                 goto out_cleanup_connect_q;
1863
1864         return 0;
1865
1866 out_cleanup_connect_q:
1867         blk_cleanup_queue(ctrl->ctrl.connect_q);
1868 out_free_tag_set:
1869         blk_mq_free_tag_set(&ctrl->tag_set);
1870 out_put_dev:
1871         nvme_rdma_dev_put(ctrl->device);
1872 out_free_io_queues:
1873         nvme_rdma_free_io_queues(ctrl);
1874         return ret;
1875 }
1876
1877 static int nvme_rdma_parse_ipaddr(struct sockaddr_in *in_addr, char *p)
1878 {
1879         u8 *addr = (u8 *)&in_addr->sin_addr.s_addr;
1880         size_t buflen = strlen(p);
1881
1882         /* XXX: handle IPv6 addresses */
1883
1884         if (buflen > INET_ADDRSTRLEN)
1885                 return -EINVAL;
1886         if (in4_pton(p, buflen, addr, '\0', NULL) == 0)
1887                 return -EINVAL;
1888         in_addr->sin_family = AF_INET;
1889         return 0;
1890 }
1891
1892 static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
1893                 struct nvmf_ctrl_options *opts)
1894 {
1895         struct nvme_rdma_ctrl *ctrl;
1896         int ret;
1897         bool changed;
1898
1899         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
1900         if (!ctrl)
1901                 return ERR_PTR(-ENOMEM);
1902         ctrl->ctrl.opts = opts;
1903         INIT_LIST_HEAD(&ctrl->list);
1904
1905         ret = nvme_rdma_parse_ipaddr(&ctrl->addr_in, opts->traddr);
1906         if (ret) {
1907                 pr_err("malformed IP address passed: %s\n", opts->traddr);
1908                 goto out_free_ctrl;
1909         }
1910
1911         if (opts->mask & NVMF_OPT_TRSVCID) {
1912                 u16 port;
1913
1914                 ret = kstrtou16(opts->trsvcid, 0, &port);
1915                 if (ret)
1916                         goto out_free_ctrl;
1917
1918                 ctrl->addr_in.sin_port = cpu_to_be16(port);
1919         } else {
1920                 ctrl->addr_in.sin_port = cpu_to_be16(NVME_RDMA_IP_PORT);
1921         }
1922
1923         ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops,
1924                                 0 /* no quirks, we're perfect! */);
1925         if (ret)
1926                 goto out_free_ctrl;
1927
1928         ctrl->reconnect_delay = opts->reconnect_delay;
1929         INIT_DELAYED_WORK(&ctrl->reconnect_work,
1930                         nvme_rdma_reconnect_ctrl_work);
1931         INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work);
1932         INIT_WORK(&ctrl->delete_work, nvme_rdma_del_ctrl_work);
1933         INIT_WORK(&ctrl->reset_work, nvme_rdma_reset_ctrl_work);
1934         spin_lock_init(&ctrl->lock);
1935
1936         ctrl->queue_count = opts->nr_io_queues + 1; /* +1 for admin queue */
1937         ctrl->ctrl.sqsize = opts->queue_size - 1;
1938         ctrl->ctrl.kato = opts->kato;
1939
1940         ret = -ENOMEM;
1941         ctrl->queues = kcalloc(ctrl->queue_count, sizeof(*ctrl->queues),
1942                                 GFP_KERNEL);
1943         if (!ctrl->queues)
1944                 goto out_uninit_ctrl;
1945
1946         ret = nvme_rdma_configure_admin_queue(ctrl);
1947         if (ret)
1948                 goto out_kfree_queues;
1949
1950         /* sanity check icdoff */
1951         if (ctrl->ctrl.icdoff) {
1952                 dev_err(ctrl->ctrl.device, "icdoff is not supported!\n");
1953                 goto out_remove_admin_queue;
1954         }
1955
1956         /* sanity check keyed sgls */
1957         if (!(ctrl->ctrl.sgls & (1 << 20))) {
1958                 dev_err(ctrl->ctrl.device, "Mandatory keyed sgls are not support\n");
1959                 goto out_remove_admin_queue;
1960         }
1961
1962         if (opts->queue_size > ctrl->ctrl.maxcmd) {
1963                 /* warn if maxcmd is lower than queue_size */
1964                 dev_warn(ctrl->ctrl.device,
1965                         "queue_size %zu > ctrl maxcmd %u, clamping down\n",
1966                         opts->queue_size, ctrl->ctrl.maxcmd);
1967                 opts->queue_size = ctrl->ctrl.maxcmd;
1968         }
1969
1970         if (opts->queue_size > ctrl->ctrl.sqsize + 1) {
1971                 /* warn if sqsize is lower than queue_size */
1972                 dev_warn(ctrl->ctrl.device,
1973                         "queue_size %zu > ctrl sqsize %u, clamping down\n",
1974                         opts->queue_size, ctrl->ctrl.sqsize + 1);
1975                 opts->queue_size = ctrl->ctrl.sqsize + 1;
1976         }
1977
1978         if (opts->nr_io_queues) {
1979                 ret = nvme_rdma_create_io_queues(ctrl);
1980                 if (ret)
1981                         goto out_remove_admin_queue;
1982         }
1983
1984         changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
1985         WARN_ON_ONCE(!changed);
1986
1987         dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISp\n",
1988                 ctrl->ctrl.opts->subsysnqn, &ctrl->addr);
1989
1990         kref_get(&ctrl->ctrl.kref);
1991
1992         mutex_lock(&nvme_rdma_ctrl_mutex);
1993         list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list);
1994         mutex_unlock(&nvme_rdma_ctrl_mutex);
1995
1996         if (opts->nr_io_queues) {
1997                 nvme_queue_scan(&ctrl->ctrl);
1998                 nvme_queue_async_events(&ctrl->ctrl);
1999         }
2000
2001         return &ctrl->ctrl;
2002
2003 out_remove_admin_queue:
2004         nvme_stop_keep_alive(&ctrl->ctrl);
2005         nvme_rdma_destroy_admin_queue(ctrl);
2006 out_kfree_queues:
2007         kfree(ctrl->queues);
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_free_ctrl:
2015         kfree(ctrl);
2016         return ERR_PTR(ret);
2017 }
2018
2019 static struct nvmf_transport_ops nvme_rdma_transport = {
2020         .name           = "rdma",
2021         .required_opts  = NVMF_OPT_TRADDR,
2022         .allowed_opts   = NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY,
2023         .create_ctrl    = nvme_rdma_create_ctrl,
2024 };
2025
2026 static void nvme_rdma_add_one(struct ib_device *ib_device)
2027 {
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
2034         /* Delete all controllers using this device */
2035         mutex_lock(&nvme_rdma_ctrl_mutex);
2036         list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
2037                 if (ctrl->device->dev != ib_device)
2038                         continue;
2039                 dev_info(ctrl->ctrl.device,
2040                         "Removing ctrl: NQN \"%s\", addr %pISp\n",
2041                         ctrl->ctrl.opts->subsysnqn, &ctrl->addr);
2042                 __nvme_rdma_del_ctrl(ctrl);
2043         }
2044         mutex_unlock(&nvme_rdma_ctrl_mutex);
2045
2046         flush_workqueue(nvme_rdma_wq);
2047 }
2048
2049 static struct ib_client nvme_rdma_ib_client = {
2050         .name   = "nvme_rdma",
2051         .add = nvme_rdma_add_one,
2052         .remove = nvme_rdma_remove_one
2053 };
2054
2055 static int __init nvme_rdma_init_module(void)
2056 {
2057         int ret;
2058
2059         nvme_rdma_wq = create_workqueue("nvme_rdma_wq");
2060         if (!nvme_rdma_wq)
2061                 return -ENOMEM;
2062
2063         ret = ib_register_client(&nvme_rdma_ib_client);
2064         if (ret) {
2065                 destroy_workqueue(nvme_rdma_wq);
2066                 return ret;
2067         }
2068
2069         nvmf_register_transport(&nvme_rdma_transport);
2070         return 0;
2071 }
2072
2073 static void __exit nvme_rdma_cleanup_module(void)
2074 {
2075         nvmf_unregister_transport(&nvme_rdma_transport);
2076         ib_unregister_client(&nvme_rdma_ib_client);
2077         destroy_workqueue(nvme_rdma_wq);
2078 }
2079
2080 module_init(nvme_rdma_init_module);
2081 module_exit(nvme_rdma_cleanup_module);
2082
2083 MODULE_LICENSE("GPL v2");