drivers/nvme/target/rdma.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * NVMe over Fabrics RDMA target.
   4  * Copyright (c) 2015-2016 HGST, a Western Digital Company.
   5  */
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7 #include <linux/atomic.h>
   8 #include <linux/ctype.h>
   9 #include <linux/delay.h>
  10 #include <linux/err.h>
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/nvme.h>
  14 #include <linux/slab.h>
  15 #include <linux/string.h>
  16 #include <linux/wait.h>
  17 #include <linux/inet.h>
  18 #include <asm/unaligned.h>
  19
  20 #include <rdma/ib_verbs.h>
  21 #include <rdma/rdma_cm.h>
  22 #include <rdma/rw.h>
  23 #include <rdma/ib_cm.h>
  24
  25 #include <linux/nvme-rdma.h>
  26 #include "nvmet.h"
  27
  28 /*
  29  * We allow at least 1 page, up to 4 SGEs, and up to 16KB of inline data
  30  */
  31 #define NVMET_RDMA_DEFAULT_INLINE_DATA_SIZE     PAGE_SIZE
  32 #define NVMET_RDMA_MAX_INLINE_SGE               4
  33 #define NVMET_RDMA_MAX_INLINE_DATA_SIZE         max_t(int, SZ_16K, PAGE_SIZE)
  34
  35 /* Assume mpsmin == device_page_size == 4KB */
  36 #define NVMET_RDMA_MAX_MDTS                     8
  37 #define NVMET_RDMA_MAX_METADATA_MDTS            5
  38
  39 struct nvmet_rdma_srq;
  40
  41 struct nvmet_rdma_cmd {
  42         struct ib_sge           sge[NVMET_RDMA_MAX_INLINE_SGE + 1];
  43         struct ib_cqe           cqe;
  44         struct ib_recv_wr       wr;
  45         struct scatterlist      inline_sg[NVMET_RDMA_MAX_INLINE_SGE];
  46         struct nvme_command     *nvme_cmd;
  47         struct nvmet_rdma_queue *queue;
  48         struct nvmet_rdma_srq   *nsrq;
  49 };
  50
  51 enum {
  52         NVMET_RDMA_REQ_INLINE_DATA      = (1 << 0),
  53         NVMET_RDMA_REQ_INVALIDATE_RKEY  = (1 << 1),
  54 };
  55
  56 struct nvmet_rdma_rsp {
  57         struct ib_sge           send_sge;
  58         struct ib_cqe           send_cqe;
  59         struct ib_send_wr       send_wr;
  60
  61         struct nvmet_rdma_cmd   *cmd;
  62         struct nvmet_rdma_queue *queue;
  63
  64         struct ib_cqe           read_cqe;
  65         struct ib_cqe           write_cqe;
  66         struct rdma_rw_ctx      rw;
  67
  68         struct nvmet_req        req;
  69
  70         bool                    allocated;
  71         u8                      n_rdma;
  72         u32                     flags;
  73         u32                     invalidate_rkey;
  74
  75         struct list_head        wait_list;
  76         struct list_head        free_list;
  77 };
  78
  79 enum nvmet_rdma_queue_state {
  80         NVMET_RDMA_Q_CONNECTING,
  81         NVMET_RDMA_Q_LIVE,
  82         NVMET_RDMA_Q_DISCONNECTING,
  83 };
  84
  85 struct nvmet_rdma_queue {
  86         struct rdma_cm_id       *cm_id;
  87         struct ib_qp            *qp;
  88         struct nvmet_port       *port;
  89         struct ib_cq            *cq;
  90         atomic_t                sq_wr_avail;
  91         struct nvmet_rdma_device *dev;
  92         struct nvmet_rdma_srq   *nsrq;
  93         spinlock_t              state_lock;
  94         enum nvmet_rdma_queue_state state;
  95         struct nvmet_cq         nvme_cq;
  96         struct nvmet_sq         nvme_sq;
  97
  98         struct nvmet_rdma_rsp   *rsps;
  99         struct list_head        free_rsps;
 100         spinlock_t              rsps_lock;
 101         struct nvmet_rdma_cmd   *cmds;
 102
 103         struct work_struct      release_work;
 104         struct list_head        rsp_wait_list;
 105         struct list_head        rsp_wr_wait_list;
 106         spinlock_t              rsp_wr_wait_lock;
 107
 108         int                     idx;
 109         int                     host_qid;
 110         int                     comp_vector;
 111         int                     recv_queue_size;
 112         int                     send_queue_size;
 113
 114         struct list_head        queue_list;
 115 };
 116
 117 struct nvmet_rdma_port {
 118         struct nvmet_port       *nport;
 119         struct sockaddr_storage addr;
 120         struct rdma_cm_id       *cm_id;
 121         struct delayed_work     repair_work;
 122 };
 123
 124 struct nvmet_rdma_srq {
 125         struct ib_srq            *srq;
 126         struct nvmet_rdma_cmd    *cmds;
 127         struct nvmet_rdma_device *ndev;
 128 };
 129
 130 struct nvmet_rdma_device {
 131         struct ib_device        *device;
 132         struct ib_pd            *pd;
 133         struct nvmet_rdma_srq   **srqs;
 134         int                     srq_count;
 135         size_t                  srq_size;
 136         struct kref             ref;
 137         struct list_head        entry;
 138         int                     inline_data_size;
 139         int                     inline_page_count;
 140 };
 141
 142 static bool nvmet_rdma_use_srq;
 143 module_param_named(use_srq, nvmet_rdma_use_srq, bool, 0444);
 144 MODULE_PARM_DESC(use_srq, "Use shared receive queue.");
 145
 146 static int srq_size_set(const char *val, const struct kernel_param *kp);
 147 static const struct kernel_param_ops srq_size_ops = {
 148         .set = srq_size_set,
 149         .get = param_get_int,
 150 };
 151
 152 static int nvmet_rdma_srq_size = 1024;
 153 module_param_cb(srq_size, &srq_size_ops, &nvmet_rdma_srq_size, 0644);
 154 MODULE_PARM_DESC(srq_size, "set Shared Receive Queue (SRQ) size, should >= 256 (default: 1024)");
 155
 156 static DEFINE_IDA(nvmet_rdma_queue_ida);
 157 static LIST_HEAD(nvmet_rdma_queue_list);
 158 static DEFINE_MUTEX(nvmet_rdma_queue_mutex);
 159
 160 static LIST_HEAD(device_list);
 161 static DEFINE_MUTEX(device_list_mutex);
 162
 163 static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp);
 164 static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc);
 165 static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
 166 static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc);
 167 static void nvmet_rdma_write_data_done(struct ib_cq *cq, struct ib_wc *wc);
 168 static void nvmet_rdma_qp_event(struct ib_event *event, void *priv);
 169 static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue);
 170 static void nvmet_rdma_free_rsp(struct nvmet_rdma_device *ndev,
 171                                 struct nvmet_rdma_rsp *r);
 172 static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev,
 173                                 struct nvmet_rdma_rsp *r);
 174
 175 static const struct nvmet_fabrics_ops nvmet_rdma_ops;
 176
 177 static int srq_size_set(const char *val, const struct kernel_param *kp)
 178 {
 179         int n = 0, ret;
 180
 181         ret = kstrtoint(val, 10, &n);
 182         if (ret != 0 || n < 256)
 183                 return -EINVAL;
 184
 185         return param_set_int(val, kp);
 186 }
 187
 188 static int num_pages(int len)
 189 {
 190         return 1 + (((len - 1) & PAGE_MASK) >> PAGE_SHIFT);
 191 }
 192
 193 static inline bool nvmet_rdma_need_data_in(struct nvmet_rdma_rsp *rsp)
 194 {
 195         return nvme_is_write(rsp->req.cmd) &&
 196                 rsp->req.transfer_len &&
 197                 !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA);
 198 }
 199
 200 static inline bool nvmet_rdma_need_data_out(struct nvmet_rdma_rsp *rsp)
 201 {
 202         return !nvme_is_write(rsp->req.cmd) &&
 203                 rsp->req.transfer_len &&
 204                 !rsp->req.cqe->status &&
 205                 !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA);
 206 }
 207
 208 static inline struct nvmet_rdma_rsp *
 209 nvmet_rdma_get_rsp(struct nvmet_rdma_queue *queue)
 210 {
 211         struct nvmet_rdma_rsp *rsp;
 212         unsigned long flags;
 213
 214         spin_lock_irqsave(&queue->rsps_lock, flags);
 215         rsp = list_first_entry_or_null(&queue->free_rsps,
 216                                 struct nvmet_rdma_rsp, free_list);
 217         if (likely(rsp))
 218                 list_del(&rsp->free_list);
 219         spin_unlock_irqrestore(&queue->rsps_lock, flags);
 220
 221         if (unlikely(!rsp)) {
 222                 int ret;
 223
 224                 rsp = kzalloc(sizeof(*rsp), GFP_KERNEL);
 225                 if (unlikely(!rsp))
 226                         return NULL;
 227                 ret = nvmet_rdma_alloc_rsp(queue->dev, rsp);
 228                 if (unlikely(ret)) {
 229                         kfree(rsp);
 230                         return NULL;
 231                 }
 232
 233                 rsp->allocated = true;
 234         }
 235
 236         return rsp;
 237 }
 238
 239 static inline void
 240 nvmet_rdma_put_rsp(struct nvmet_rdma_rsp *rsp)
 241 {
 242         unsigned long flags;
 243
 244         if (unlikely(rsp->allocated)) {
 245                 nvmet_rdma_free_rsp(rsp->queue->dev, rsp);
 246                 kfree(rsp);
 247                 return;
 248         }
 249
 250         spin_lock_irqsave(&rsp->queue->rsps_lock, flags);
 251         list_add_tail(&rsp->free_list, &rsp->queue->free_rsps);
 252         spin_unlock_irqrestore(&rsp->queue->rsps_lock, flags);
 253 }
 254
 255 static void nvmet_rdma_free_inline_pages(struct nvmet_rdma_device *ndev,
 256                                 struct nvmet_rdma_cmd *c)
 257 {
 258         struct scatterlist *sg;
 259         struct ib_sge *sge;
 260         int i;
 261
 262         if (!ndev->inline_data_size)
 263                 return;
 264
 265         sg = c->inline_sg;
 266         sge = &c->sge[1];
 267
 268         for (i = 0; i < ndev->inline_page_count; i++, sg++, sge++) {
 269                 if (sge->length)
 270                         ib_dma_unmap_page(ndev->device, sge->addr,
 271                                         sge->length, DMA_FROM_DEVICE);
 272                 if (sg_page(sg))
 273                         __free_page(sg_page(sg));
 274         }
 275 }
 276
 277 static int nvmet_rdma_alloc_inline_pages(struct nvmet_rdma_device *ndev,
 278                                 struct nvmet_rdma_cmd *c)
 279 {
 280         struct scatterlist *sg;
 281         struct ib_sge *sge;
 282         struct page *pg;
 283         int len;
 284         int i;
 285
 286         if (!ndev->inline_data_size)
 287                 return 0;
 288
 289         sg = c->inline_sg;
 290         sg_init_table(sg, ndev->inline_page_count);
 291         sge = &c->sge[1];
 292         len = ndev->inline_data_size;
 293
 294         for (i = 0; i < ndev->inline_page_count; i++, sg++, sge++) {
 295                 pg = alloc_page(GFP_KERNEL);
 296                 if (!pg)
 297                         goto out_err;
 298                 sg_assign_page(sg, pg);
 299                 sge->addr = ib_dma_map_page(ndev->device,
 300                         pg, 0, PAGE_SIZE, DMA_FROM_DEVICE);
 301                 if (ib_dma_mapping_error(ndev->device, sge->addr))
 302                         goto out_err;
 303                 sge->length = min_t(int, len, PAGE_SIZE);
 304                 sge->lkey = ndev->pd->local_dma_lkey;
 305                 len -= sge->length;
 306         }
 307
 308         return 0;
 309 out_err:
 310         for (; i >= 0; i--, sg--, sge--) {
 311                 if (sge->length)
 312                         ib_dma_unmap_page(ndev->device, sge->addr,
 313                                         sge->length, DMA_FROM_DEVICE);
 314                 if (sg_page(sg))
 315                         __free_page(sg_page(sg));
 316         }
 317         return -ENOMEM;
 318 }
 319
 320 static int nvmet_rdma_alloc_cmd(struct nvmet_rdma_device *ndev,
 321                         struct nvmet_rdma_cmd *c, bool admin)
 322 {
 323         /* NVMe command / RDMA RECV */
 324         c->nvme_cmd = kmalloc(sizeof(*c->nvme_cmd), GFP_KERNEL);
 325         if (!c->nvme_cmd)
 326                 goto out;
 327
 328         c->sge[0].addr = ib_dma_map_single(ndev->device, c->nvme_cmd,
 329                         sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
 330         if (ib_dma_mapping_error(ndev->device, c->sge[0].addr))
 331                 goto out_free_cmd;
 332
 333         c->sge[0].length = sizeof(*c->nvme_cmd);
 334         c->sge[0].lkey = ndev->pd->local_dma_lkey;
 335
 336         if (!admin && nvmet_rdma_alloc_inline_pages(ndev, c))
 337                 goto out_unmap_cmd;
 338
 339         c->cqe.done = nvmet_rdma_recv_done;
 340
 341         c->wr.wr_cqe = &c->cqe;
 342         c->wr.sg_list = c->sge;
 343         c->wr.num_sge = admin ? 1 : ndev->inline_page_count + 1;
 344
 345         return 0;
 346
 347 out_unmap_cmd:
 348         ib_dma_unmap_single(ndev->device, c->sge[0].addr,
 349                         sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
 350 out_free_cmd:
 351         kfree(c->nvme_cmd);
 352
 353 out:
 354         return -ENOMEM;
 355 }
 356
 357 static void nvmet_rdma_free_cmd(struct nvmet_rdma_device *ndev,
 358                 struct nvmet_rdma_cmd *c, bool admin)
 359 {
 360         if (!admin)
 361                 nvmet_rdma_free_inline_pages(ndev, c);
 362         ib_dma_unmap_single(ndev->device, c->sge[0].addr,
 363                                 sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
 364         kfree(c->nvme_cmd);
 365 }
 366
 367 static struct nvmet_rdma_cmd *
 368 nvmet_rdma_alloc_cmds(struct nvmet_rdma_device *ndev,
 369                 int nr_cmds, bool admin)
 370 {
 371         struct nvmet_rdma_cmd *cmds;
 372         int ret = -EINVAL, i;
 373
 374         cmds = kcalloc(nr_cmds, sizeof(struct nvmet_rdma_cmd), GFP_KERNEL);
 375         if (!cmds)
 376                 goto out;
 377
 378         for (i = 0; i < nr_cmds; i++) {
 379                 ret = nvmet_rdma_alloc_cmd(ndev, cmds + i, admin);
 380                 if (ret)
 381                         goto out_free;
 382         }
 383
 384         return cmds;
 385
 386 out_free:
 387         while (--i >= 0)
 388                 nvmet_rdma_free_cmd(ndev, cmds + i, admin);
 389         kfree(cmds);
 390 out:
 391         return ERR_PTR(ret);
 392 }
 393
 394 static void nvmet_rdma_free_cmds(struct nvmet_rdma_device *ndev,
 395                 struct nvmet_rdma_cmd *cmds, int nr_cmds, bool admin)
 396 {
 397         int i;
 398
 399         for (i = 0; i < nr_cmds; i++)
 400                 nvmet_rdma_free_cmd(ndev, cmds + i, admin);
 401         kfree(cmds);
 402 }
 403
 404 static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev,
 405                 struct nvmet_rdma_rsp *r)
 406 {
 407         /* NVMe CQE / RDMA SEND */
 408         r->req.cqe = kmalloc(sizeof(*r->req.cqe), GFP_KERNEL);
 409         if (!r->req.cqe)
 410                 goto out;
 411
 412         r->send_sge.addr = ib_dma_map_single(ndev->device, r->req.cqe,
 413                         sizeof(*r->req.cqe), DMA_TO_DEVICE);
 414         if (ib_dma_mapping_error(ndev->device, r->send_sge.addr))
 415                 goto out_free_rsp;
 416
 417         if (!ib_uses_virt_dma(ndev->device))
 418                 r->req.p2p_client = &ndev->device->dev;
 419         r->send_sge.length = sizeof(*r->req.cqe);
 420         r->send_sge.lkey = ndev->pd->local_dma_lkey;
 421
 422         r->send_cqe.done = nvmet_rdma_send_done;
 423
 424         r->send_wr.wr_cqe = &r->send_cqe;
 425         r->send_wr.sg_list = &r->send_sge;
 426         r->send_wr.num_sge = 1;
 427         r->send_wr.send_flags = IB_SEND_SIGNALED;
 428
 429         /* Data In / RDMA READ */
 430         r->read_cqe.done = nvmet_rdma_read_data_done;
 431         /* Data Out / RDMA WRITE */
 432         r->write_cqe.done = nvmet_rdma_write_data_done;
 433
 434         return 0;
 435
 436 out_free_rsp:
 437         kfree(r->req.cqe);
 438 out:
 439         return -ENOMEM;
 440 }
 441
 442 static void nvmet_rdma_free_rsp(struct nvmet_rdma_device *ndev,
 443                 struct nvmet_rdma_rsp *r)
 444 {
 445         ib_dma_unmap_single(ndev->device, r->send_sge.addr,
 446                                 sizeof(*r->req.cqe), DMA_TO_DEVICE);
 447         kfree(r->req.cqe);
 448 }
 449
 450 static int
 451 nvmet_rdma_alloc_rsps(struct nvmet_rdma_queue *queue)
 452 {
 453         struct nvmet_rdma_device *ndev = queue->dev;
 454         int nr_rsps = queue->recv_queue_size * 2;
 455         int ret = -EINVAL, i;
 456
 457         queue->rsps = kcalloc(nr_rsps, sizeof(struct nvmet_rdma_rsp),
 458                         GFP_KERNEL);
 459         if (!queue->rsps)
 460                 goto out;
 461
 462         for (i = 0; i < nr_rsps; i++) {
 463                 struct nvmet_rdma_rsp *rsp = &queue->rsps[i];
 464
 465                 ret = nvmet_rdma_alloc_rsp(ndev, rsp);
 466                 if (ret)
 467                         goto out_free;
 468
 469                 list_add_tail(&rsp->free_list, &queue->free_rsps);
 470         }
 471
 472         return 0;
 473
 474 out_free:
 475         while (--i >= 0) {
 476                 struct nvmet_rdma_rsp *rsp = &queue->rsps[i];
 477
 478                 list_del(&rsp->free_list);
 479                 nvmet_rdma_free_rsp(ndev, rsp);
 480         }
 481         kfree(queue->rsps);
 482 out:
 483         return ret;
 484 }
 485
 486 static void nvmet_rdma_free_rsps(struct nvmet_rdma_queue *queue)
 487 {
 488         struct nvmet_rdma_device *ndev = queue->dev;
 489         int i, nr_rsps = queue->recv_queue_size * 2;
 490
 491         for (i = 0; i < nr_rsps; i++) {
 492                 struct nvmet_rdma_rsp *rsp = &queue->rsps[i];
 493
 494                 list_del(&rsp->free_list);
 495                 nvmet_rdma_free_rsp(ndev, rsp);
 496         }
 497         kfree(queue->rsps);
 498 }
 499
 500 static int nvmet_rdma_post_recv(struct nvmet_rdma_device *ndev,
 501                 struct nvmet_rdma_cmd *cmd)
 502 {
 503         int ret;
 504
 505         ib_dma_sync_single_for_device(ndev->device,
 506                 cmd->sge[0].addr, cmd->sge[0].length,
 507                 DMA_FROM_DEVICE);
 508
 509         if (cmd->nsrq)
 510                 ret = ib_post_srq_recv(cmd->nsrq->srq, &cmd->wr, NULL);
 511         else
 512                 ret = ib_post_recv(cmd->queue->qp, &cmd->wr, NULL);
 513
 514         if (unlikely(ret))
 515                 pr_err("post_recv cmd failed\n");
 516
 517         return ret;
 518 }
 519
 520 static void nvmet_rdma_process_wr_wait_list(struct nvmet_rdma_queue *queue)
 521 {
 522         spin_lock(&queue->rsp_wr_wait_lock);
 523         while (!list_empty(&queue->rsp_wr_wait_list)) {
 524                 struct nvmet_rdma_rsp *rsp;
 525                 bool ret;
 526
 527                 rsp = list_entry(queue->rsp_wr_wait_list.next,
 528                                 struct nvmet_rdma_rsp, wait_list);
 529                 list_del(&rsp->wait_list);
 530
 531                 spin_unlock(&queue->rsp_wr_wait_lock);
 532                 ret = nvmet_rdma_execute_command(rsp);
 533                 spin_lock(&queue->rsp_wr_wait_lock);
 534
 535                 if (!ret) {
 536                         list_add(&rsp->wait_list, &queue->rsp_wr_wait_list);
 537                         break;
 538                 }
 539         }
 540         spin_unlock(&queue->rsp_wr_wait_lock);
 541 }
 542
 543 static u16 nvmet_rdma_check_pi_status(struct ib_mr *sig_mr)
 544 {
 545         struct ib_mr_status mr_status;
 546         int ret;
 547         u16 status = 0;
 548
 549         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
 550         if (ret) {
 551                 pr_err("ib_check_mr_status failed, ret %d\n", ret);
 552                 return NVME_SC_INVALID_PI;
 553         }
 554
 555         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
 556                 switch (mr_status.sig_err.err_type) {
 557                 case IB_SIG_BAD_GUARD:
 558                         status = NVME_SC_GUARD_CHECK;
 559                         break;
 560                 case IB_SIG_BAD_REFTAG:
 561                         status = NVME_SC_REFTAG_CHECK;
 562                         break;
 563                 case IB_SIG_BAD_APPTAG:
 564                         status = NVME_SC_APPTAG_CHECK;
 565                         break;
 566                 }
 567                 pr_err("PI error found type %d expected 0x%x vs actual 0x%x\n",
 568                        mr_status.sig_err.err_type,
 569                        mr_status.sig_err.expected,
 570                        mr_status.sig_err.actual);
 571         }
 572
 573         return status;
 574 }
 575
 576 static void nvmet_rdma_set_sig_domain(struct blk_integrity *bi,
 577                 struct nvme_command *cmd, struct ib_sig_domain *domain,
 578                 u16 control, u8 pi_type)
 579 {
 580         domain->sig_type = IB_SIG_TYPE_T10_DIF;
 581         domain->sig.dif.bg_type = IB_T10DIF_CRC;
 582         domain->sig.dif.pi_interval = 1 << bi->interval_exp;
 583         domain->sig.dif.ref_tag = le32_to_cpu(cmd->rw.reftag);
 584         if (control & NVME_RW_PRINFO_PRCHK_REF)
 585                 domain->sig.dif.ref_remap = true;
 586
 587         domain->sig.dif.app_tag = le16_to_cpu(cmd->rw.apptag);
 588         domain->sig.dif.apptag_check_mask = le16_to_cpu(cmd->rw.appmask);
 589         domain->sig.dif.app_escape = true;
 590         if (pi_type == NVME_NS_DPS_PI_TYPE3)
 591                 domain->sig.dif.ref_escape = true;
 592 }
 593
 594 static void nvmet_rdma_set_sig_attrs(struct nvmet_req *req,
 595                                      struct ib_sig_attrs *sig_attrs)
 596 {
 597         struct nvme_command *cmd = req->cmd;
 598         u16 control = le16_to_cpu(cmd->rw.control);
 599         u8 pi_type = req->ns->pi_type;
 600         struct blk_integrity *bi;
 601
 602         bi = bdev_get_integrity(req->ns->bdev);
 603
 604         memset(sig_attrs, 0, sizeof(*sig_attrs));
 605
 606         if (control & NVME_RW_PRINFO_PRACT) {
 607                 /* for WRITE_INSERT/READ_STRIP no wire domain */
 608                 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
 609                 nvmet_rdma_set_sig_domain(bi, cmd, &sig_attrs->mem, control,
 610                                           pi_type);
 611                 /* Clear the PRACT bit since HCA will generate/verify the PI */
 612                 control &= ~NVME_RW_PRINFO_PRACT;
 613                 cmd->rw.control = cpu_to_le16(control);
 614                 /* PI is added by the HW */
 615                 req->transfer_len += req->metadata_len;
 616         } else {
 617                 /* for WRITE_PASS/READ_PASS both wire/memory domains exist */
 618                 nvmet_rdma_set_sig_domain(bi, cmd, &sig_attrs->wire, control,
 619                                           pi_type);
 620                 nvmet_rdma_set_sig_domain(bi, cmd, &sig_attrs->mem, control,
 621                                           pi_type);
 622         }
 623
 624         if (control & NVME_RW_PRINFO_PRCHK_REF)
 625                 sig_attrs->check_mask |= IB_SIG_CHECK_REFTAG;
 626         if (control & NVME_RW_PRINFO_PRCHK_GUARD)
 627                 sig_attrs->check_mask |= IB_SIG_CHECK_GUARD;
 628         if (control & NVME_RW_PRINFO_PRCHK_APP)
 629                 sig_attrs->check_mask |= IB_SIG_CHECK_APPTAG;
 630 }
 631
 632 static int nvmet_rdma_rw_ctx_init(struct nvmet_rdma_rsp *rsp, u64 addr, u32 key,
 633                                   struct ib_sig_attrs *sig_attrs)
 634 {
 635         struct rdma_cm_id *cm_id = rsp->queue->cm_id;
 636         struct nvmet_req *req = &rsp->req;
 637         int ret;
 638
 639         if (req->metadata_len)
 640                 ret = rdma_rw_ctx_signature_init(&rsp->rw, cm_id->qp,
 641                         cm_id->port_num, req->sg, req->sg_cnt,
 642                         req->metadata_sg, req->metadata_sg_cnt, sig_attrs,
 643                         addr, key, nvmet_data_dir(req));
 644         else
 645                 ret = rdma_rw_ctx_init(&rsp->rw, cm_id->qp, cm_id->port_num,
 646                                        req->sg, req->sg_cnt, 0, addr, key,
 647                                        nvmet_data_dir(req));
 648
 649         return ret;
 650 }
 651
 652 static void nvmet_rdma_rw_ctx_destroy(struct nvmet_rdma_rsp *rsp)
 653 {
 654         struct rdma_cm_id *cm_id = rsp->queue->cm_id;
 655         struct nvmet_req *req = &rsp->req;
 656
 657         if (req->metadata_len)
 658                 rdma_rw_ctx_destroy_signature(&rsp->rw, cm_id->qp,
 659                         cm_id->port_num, req->sg, req->sg_cnt,
 660                         req->metadata_sg, req->metadata_sg_cnt,
 661                         nvmet_data_dir(req));
 662         else
 663                 rdma_rw_ctx_destroy(&rsp->rw, cm_id->qp, cm_id->port_num,
 664                                     req->sg, req->sg_cnt, nvmet_data_dir(req));
 665 }
 666
 667 static void nvmet_rdma_release_rsp(struct nvmet_rdma_rsp *rsp)
 668 {
 669         struct nvmet_rdma_queue *queue = rsp->queue;
 670
 671         atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail);
 672
 673         if (rsp->n_rdma)
 674                 nvmet_rdma_rw_ctx_destroy(rsp);
 675
 676         if (rsp->req.sg != rsp->cmd->inline_sg)
 677                 nvmet_req_free_sgls(&rsp->req);
 678
 679         if (unlikely(!list_empty_careful(&queue->rsp_wr_wait_list)))
 680                 nvmet_rdma_process_wr_wait_list(queue);
 681
 682         nvmet_rdma_put_rsp(rsp);
 683 }
 684
 685 static void nvmet_rdma_error_comp(struct nvmet_rdma_queue *queue)
 686 {
 687         if (queue->nvme_sq.ctrl) {
 688                 nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl);
 689         } else {
 690                 /*
 691                  * we didn't setup the controller yet in case
 692                  * of admin connect error, just disconnect and
 693                  * cleanup the queue
 694                  */
 695                 nvmet_rdma_queue_disconnect(queue);
 696         }
 697 }
 698
 699 static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
 700 {
 701         struct nvmet_rdma_rsp *rsp =
 702                 container_of(wc->wr_cqe, struct nvmet_rdma_rsp, send_cqe);
 703         struct nvmet_rdma_queue *queue = cq->cq_context;
 704
 705         nvmet_rdma_release_rsp(rsp);
 706
 707         if (unlikely(wc->status != IB_WC_SUCCESS &&
 708                      wc->status != IB_WC_WR_FLUSH_ERR)) {
 709                 pr_err("SEND for CQE 0x%p failed with status %s (%d).\n",
 710                         wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status);
 711                 nvmet_rdma_error_comp(queue);
 712         }
 713 }
 714
 715 static void nvmet_rdma_queue_response(struct nvmet_req *req)
 716 {
 717         struct nvmet_rdma_rsp *rsp =
 718                 container_of(req, struct nvmet_rdma_rsp, req);
 719         struct rdma_cm_id *cm_id = rsp->queue->cm_id;
 720         struct ib_send_wr *first_wr;
 721
 722         if (rsp->flags & NVMET_RDMA_REQ_INVALIDATE_RKEY) {
 723                 rsp->send_wr.opcode = IB_WR_SEND_WITH_INV;
 724                 rsp->send_wr.ex.invalidate_rkey = rsp->invalidate_rkey;
 725         } else {
 726                 rsp->send_wr.opcode = IB_WR_SEND;
 727         }
 728
 729         if (nvmet_rdma_need_data_out(rsp)) {
 730                 if (rsp->req.metadata_len)
 731                         first_wr = rdma_rw_ctx_wrs(&rsp->rw, cm_id->qp,
 732                                         cm_id->port_num, &rsp->write_cqe, NULL);
 733                 else
 734                         first_wr = rdma_rw_ctx_wrs(&rsp->rw, cm_id->qp,
 735                                         cm_id->port_num, NULL, &rsp->send_wr);
 736         } else {
 737                 first_wr = &rsp->send_wr;
 738         }
 739
 740         nvmet_rdma_post_recv(rsp->queue->dev, rsp->cmd);
 741
 742         ib_dma_sync_single_for_device(rsp->queue->dev->device,
 743                 rsp->send_sge.addr, rsp->send_sge.length,
 744                 DMA_TO_DEVICE);
 745
 746         if (unlikely(ib_post_send(cm_id->qp, first_wr, NULL))) {
 747                 pr_err("sending cmd response failed\n");
 748                 nvmet_rdma_release_rsp(rsp);
 749         }
 750 }
 751
 752 static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc)
 753 {
 754         struct nvmet_rdma_rsp *rsp =
 755                 container_of(wc->wr_cqe, struct nvmet_rdma_rsp, read_cqe);
 756         struct nvmet_rdma_queue *queue = wc->qp->qp_context;
 757         u16 status = 0;
 758
 759         WARN_ON(rsp->n_rdma <= 0);
 760         atomic_add(rsp->n_rdma, &queue->sq_wr_avail);
 761         rsp->n_rdma = 0;
 762
 763         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 764                 nvmet_rdma_rw_ctx_destroy(rsp);
 765                 nvmet_req_uninit(&rsp->req);
 766                 nvmet_rdma_release_rsp(rsp);
 767                 if (wc->status != IB_WC_WR_FLUSH_ERR) {
 768                         pr_info("RDMA READ for CQE 0x%p failed with status %s (%d).\n",
 769                                 wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status);
 770                         nvmet_rdma_error_comp(queue);
 771                 }
 772                 return;
 773         }
 774
 775         if (rsp->req.metadata_len)
 776                 status = nvmet_rdma_check_pi_status(rsp->rw.reg->mr);
 777         nvmet_rdma_rw_ctx_destroy(rsp);
 778
 779         if (unlikely(status))
 780                 nvmet_req_complete(&rsp->req, status);
 781         else
 782                 rsp->req.execute(&rsp->req);
 783 }
 784
 785 static void nvmet_rdma_write_data_done(struct ib_cq *cq, struct ib_wc *wc)
 786 {
 787         struct nvmet_rdma_rsp *rsp =
 788                 container_of(wc->wr_cqe, struct nvmet_rdma_rsp, write_cqe);
 789         struct nvmet_rdma_queue *queue = cq->cq_context;
 790         struct rdma_cm_id *cm_id = rsp->queue->cm_id;
 791         u16 status;
 792
 793         if (!IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY))
 794                 return;
 795
 796         WARN_ON(rsp->n_rdma <= 0);
 797         atomic_add(rsp->n_rdma, &queue->sq_wr_avail);
 798         rsp->n_rdma = 0;
 799
 800         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 801                 nvmet_rdma_rw_ctx_destroy(rsp);
 802                 nvmet_req_uninit(&rsp->req);
 803                 nvmet_rdma_release_rsp(rsp);
 804                 if (wc->status != IB_WC_WR_FLUSH_ERR) {
 805                         pr_info("RDMA WRITE for CQE 0x%p failed with status %s (%d).\n",
 806                                 wc->wr_cqe, ib_wc_status_msg(wc->status),
 807                                 wc->status);
 808                         nvmet_rdma_error_comp(queue);
 809                 }
 810                 return;
 811         }
 812
 813         /*
 814          * Upon RDMA completion check the signature status
 815          * - if succeeded send good NVMe response
 816          * - if failed send bad NVMe response with appropriate error
 817          */
 818         status = nvmet_rdma_check_pi_status(rsp->rw.reg->mr);
 819         if (unlikely(status))
 820                 rsp->req.cqe->status = cpu_to_le16(status << 1);
 821         nvmet_rdma_rw_ctx_destroy(rsp);
 822
 823         if (unlikely(ib_post_send(cm_id->qp, &rsp->send_wr, NULL))) {
 824                 pr_err("sending cmd response failed\n");
 825                 nvmet_rdma_release_rsp(rsp);
 826         }
 827 }
 828
 829 static void nvmet_rdma_use_inline_sg(struct nvmet_rdma_rsp *rsp, u32 len,
 830                 u64 off)
 831 {
 832         int sg_count = num_pages(len);
 833         struct scatterlist *sg;
 834         int i;
 835
 836         sg = rsp->cmd->inline_sg;
 837         for (i = 0; i < sg_count; i++, sg++) {
 838                 if (i < sg_count - 1)
 839                         sg_unmark_end(sg);
 840                 else
 841                         sg_mark_end(sg);
 842                 sg->offset = off;
 843                 sg->length = min_t(int, len, PAGE_SIZE - off);
 844                 len -= sg->length;
 845                 if (!i)
 846                         off = 0;
 847         }
 848
 849         rsp->req.sg = rsp->cmd->inline_sg;
 850         rsp->req.sg_cnt = sg_count;
 851 }
 852
 853 static u16 nvmet_rdma_map_sgl_inline(struct nvmet_rdma_rsp *rsp)
 854 {
 855         struct nvme_sgl_desc *sgl = &rsp->req.cmd->common.dptr.sgl;
 856         u64 off = le64_to_cpu(sgl->addr);
 857         u32 len = le32_to_cpu(sgl->length);
 858
 859         if (!nvme_is_write(rsp->req.cmd)) {
 860                 rsp->req.error_loc =
 861                         offsetof(struct nvme_common_command, opcode);
 862                 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
 863         }
 864
 865         if (off + len > rsp->queue->dev->inline_data_size) {
 866                 pr_err("invalid inline data offset!\n");
 867                 return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR;
 868         }
 869
 870         /* no data command? */
 871         if (!len)
 872                 return 0;
 873
 874         nvmet_rdma_use_inline_sg(rsp, len, off);
 875         rsp->flags |= NVMET_RDMA_REQ_INLINE_DATA;
 876         rsp->req.transfer_len += len;
 877         return 0;
 878 }
 879
 880 static u16 nvmet_rdma_map_sgl_keyed(struct nvmet_rdma_rsp *rsp,
 881                 struct nvme_keyed_sgl_desc *sgl, bool invalidate)
 882 {
 883         u64 addr = le64_to_cpu(sgl->addr);
 884         u32 key = get_unaligned_le32(sgl->key);
 885         struct ib_sig_attrs sig_attrs;
 886         int ret;
 887
 888         rsp->req.transfer_len = get_unaligned_le24(sgl->length);
 889
 890         /* no data command? */
 891         if (!rsp->req.transfer_len)
 892                 return 0;
 893
 894         if (rsp->req.metadata_len)
 895                 nvmet_rdma_set_sig_attrs(&rsp->req, &sig_attrs);
 896
 897         ret = nvmet_req_alloc_sgls(&rsp->req);
 898         if (unlikely(ret < 0))
 899                 goto error_out;
 900
 901         ret = nvmet_rdma_rw_ctx_init(rsp, addr, key, &sig_attrs);
 902         if (unlikely(ret < 0))
 903                 goto error_out;
 904         rsp->n_rdma += ret;
 905
 906         if (invalidate) {
 907                 rsp->invalidate_rkey = key;
 908                 rsp->flags |= NVMET_RDMA_REQ_INVALIDATE_RKEY;
 909         }
 910
 911         return 0;
 912
 913 error_out:
 914         rsp->req.transfer_len = 0;
 915         return NVME_SC_INTERNAL;
 916 }
 917
 918 static u16 nvmet_rdma_map_sgl(struct nvmet_rdma_rsp *rsp)
 919 {
 920         struct nvme_keyed_sgl_desc *sgl = &rsp->req.cmd->common.dptr.ksgl;
 921
 922         switch (sgl->type >> 4) {
 923         case NVME_SGL_FMT_DATA_DESC:
 924                 switch (sgl->type & 0xf) {
 925                 case NVME_SGL_FMT_OFFSET:
 926                         return nvmet_rdma_map_sgl_inline(rsp);
 927                 default:
 928                         pr_err("invalid SGL subtype: %#x\n", sgl->type);
 929                         rsp->req.error_loc =
 930                                 offsetof(struct nvme_common_command, dptr);
 931                         return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
 932                 }
 933         case NVME_KEY_SGL_FMT_DATA_DESC:
 934                 switch (sgl->type & 0xf) {
 935                 case NVME_SGL_FMT_ADDRESS | NVME_SGL_FMT_INVALIDATE:
 936                         return nvmet_rdma_map_sgl_keyed(rsp, sgl, true);
 937                 case NVME_SGL_FMT_ADDRESS:
 938                         return nvmet_rdma_map_sgl_keyed(rsp, sgl, false);
 939                 default:
 940                         pr_err("invalid SGL subtype: %#x\n", sgl->type);
 941                         rsp->req.error_loc =
 942                                 offsetof(struct nvme_common_command, dptr);
 943                         return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
 944                 }
 945         default:
 946                 pr_err("invalid SGL type: %#x\n", sgl->type);
 947                 rsp->req.error_loc = offsetof(struct nvme_common_command, dptr);
 948                 return NVME_SC_SGL_INVALID_TYPE | NVME_SC_DNR;
 949         }
 950 }
 951
 952 static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp)
 953 {
 954         struct nvmet_rdma_queue *queue = rsp->queue;
 955
 956         if (unlikely(atomic_sub_return(1 + rsp->n_rdma,
 957                         &queue->sq_wr_avail) < 0)) {
 958                 pr_debug("IB send queue full (needed %d): queue %u cntlid %u\n",
 959                                 1 + rsp->n_rdma, queue->idx,
 960                                 queue->nvme_sq.ctrl->cntlid);
 961                 atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail);
 962                 return false;
 963         }
 964
 965         if (nvmet_rdma_need_data_in(rsp)) {
 966                 if (rdma_rw_ctx_post(&rsp->rw, queue->qp,
 967                                 queue->cm_id->port_num, &rsp->read_cqe, NULL))
 968                         nvmet_req_complete(&rsp->req, NVME_SC_DATA_XFER_ERROR);
 969         } else {
 970                 rsp->req.execute(&rsp->req);
 971         }
 972
 973         return true;
 974 }
 975
 976 static void nvmet_rdma_handle_command(struct nvmet_rdma_queue *queue,
 977                 struct nvmet_rdma_rsp *cmd)
 978 {
 979         u16 status;
 980
 981         ib_dma_sync_single_for_cpu(queue->dev->device,
 982                 cmd->cmd->sge[0].addr, cmd->cmd->sge[0].length,
 983                 DMA_FROM_DEVICE);
 984         ib_dma_sync_single_for_cpu(queue->dev->device,
 985                 cmd->send_sge.addr, cmd->send_sge.length,
 986                 DMA_TO_DEVICE);
 987
 988         if (!nvmet_req_init(&cmd->req, &queue->nvme_cq,
 989                         &queue->nvme_sq, &nvmet_rdma_ops))
 990                 return;
 991
 992         status = nvmet_rdma_map_sgl(cmd);
 993         if (status)
 994                 goto out_err;
 995
 996         if (unlikely(!nvmet_rdma_execute_command(cmd))) {
 997                 spin_lock(&queue->rsp_wr_wait_lock);
 998                 list_add_tail(&cmd->wait_list, &queue->rsp_wr_wait_list);
 999                 spin_unlock(&queue->rsp_wr_wait_lock);
1000         }
1001
1002         return;
1003
1004 out_err:
1005         nvmet_req_complete(&cmd->req, status);
1006 }
1007
1008 static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1009 {
1010         struct nvmet_rdma_cmd *cmd =
1011                 container_of(wc->wr_cqe, struct nvmet_rdma_cmd, cqe);
1012         struct nvmet_rdma_queue *queue = wc->qp->qp_context;
1013         struct nvmet_rdma_rsp *rsp;
1014
1015         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1016                 if (wc->status != IB_WC_WR_FLUSH_ERR) {
1017                         pr_err("RECV for CQE 0x%p failed with status %s (%d)\n",
1018                                 wc->wr_cqe, ib_wc_status_msg(wc->status),
1019                                 wc->status);
1020                         nvmet_rdma_error_comp(queue);
1021                 }
1022                 return;
1023         }
1024
1025         if (unlikely(wc->byte_len < sizeof(struct nvme_command))) {
1026                 pr_err("Ctrl Fatal Error: capsule size less than 64 bytes\n");
1027                 nvmet_rdma_error_comp(queue);
1028                 return;
1029         }
1030
1031         cmd->queue = queue;
1032         rsp = nvmet_rdma_get_rsp(queue);
1033         if (unlikely(!rsp)) {
1034                 /*
1035                  * we get here only under memory pressure,
1036                  * silently drop and have the host retry
1037                  * as we can't even fail it.
1038                  */
1039                 nvmet_rdma_post_recv(queue->dev, cmd);
1040                 return;
1041         }
1042         rsp->queue = queue;
1043         rsp->cmd = cmd;
1044         rsp->flags = 0;
1045         rsp->req.cmd = cmd->nvme_cmd;
1046         rsp->req.port = queue->port;
1047         rsp->n_rdma = 0;
1048
1049         if (unlikely(queue->state != NVMET_RDMA_Q_LIVE)) {
1050                 unsigned long flags;
1051
1052                 spin_lock_irqsave(&queue->state_lock, flags);
1053                 if (queue->state == NVMET_RDMA_Q_CONNECTING)
1054                         list_add_tail(&rsp->wait_list, &queue->rsp_wait_list);
1055                 else
1056                         nvmet_rdma_put_rsp(rsp);
1057                 spin_unlock_irqrestore(&queue->state_lock, flags);
1058                 return;
1059         }
1060
1061         nvmet_rdma_handle_command(queue, rsp);
1062 }
1063
1064 static void nvmet_rdma_destroy_srq(struct nvmet_rdma_srq *nsrq)
1065 {
1066         nvmet_rdma_free_cmds(nsrq->ndev, nsrq->cmds, nsrq->ndev->srq_size,
1067                              false);
1068         ib_destroy_srq(nsrq->srq);
1069
1070         kfree(nsrq);
1071 }
1072
1073 static void nvmet_rdma_destroy_srqs(struct nvmet_rdma_device *ndev)
1074 {
1075         int i;
1076
1077         if (!ndev->srqs)
1078                 return;
1079
1080         for (i = 0; i < ndev->srq_count; i++)
1081                 nvmet_rdma_destroy_srq(ndev->srqs[i]);
1082
1083         kfree(ndev->srqs);
1084 }
1085
1086 static struct nvmet_rdma_srq *
1087 nvmet_rdma_init_srq(struct nvmet_rdma_device *ndev)
1088 {
1089         struct ib_srq_init_attr srq_attr = { NULL, };
1090         size_t srq_size = ndev->srq_size;
1091         struct nvmet_rdma_srq *nsrq;
1092         struct ib_srq *srq;
1093         int ret, i;
1094
1095         nsrq = kzalloc(sizeof(*nsrq), GFP_KERNEL);
1096         if (!nsrq)
1097                 return ERR_PTR(-ENOMEM);
1098
1099         srq_attr.attr.max_wr = srq_size;
1100         srq_attr.attr.max_sge = 1 + ndev->inline_page_count;
1101         srq_attr.attr.srq_limit = 0;
1102         srq_attr.srq_type = IB_SRQT_BASIC;
1103         srq = ib_create_srq(ndev->pd, &srq_attr);
1104         if (IS_ERR(srq)) {
1105                 ret = PTR_ERR(srq);
1106                 goto out_free;
1107         }
1108
1109         nsrq->cmds = nvmet_rdma_alloc_cmds(ndev, srq_size, false);
1110         if (IS_ERR(nsrq->cmds)) {
1111                 ret = PTR_ERR(nsrq->cmds);
1112                 goto out_destroy_srq;
1113         }
1114
1115         nsrq->srq = srq;
1116         nsrq->ndev = ndev;
1117
1118         for (i = 0; i < srq_size; i++) {
1119                 nsrq->cmds[i].nsrq = nsrq;
1120                 ret = nvmet_rdma_post_recv(ndev, &nsrq->cmds[i]);
1121                 if (ret)
1122                         goto out_free_cmds;
1123         }
1124
1125         return nsrq;
1126
1127 out_free_cmds:
1128         nvmet_rdma_free_cmds(ndev, nsrq->cmds, srq_size, false);
1129 out_destroy_srq:
1130         ib_destroy_srq(srq);
1131 out_free:
1132         kfree(nsrq);
1133         return ERR_PTR(ret);
1134 }
1135
1136 static int nvmet_rdma_init_srqs(struct nvmet_rdma_device *ndev)
1137 {
1138         int i, ret;
1139
1140         if (!ndev->device->attrs.max_srq_wr || !ndev->device->attrs.max_srq) {
1141                 /*
1142                  * If SRQs aren't supported we just go ahead and use normal
1143                  * non-shared receive queues.
1144                  */
1145                 pr_info("SRQ requested but not supported.\n");
1146                 return 0;
1147         }
1148
1149         ndev->srq_size = min(ndev->device->attrs.max_srq_wr,
1150                              nvmet_rdma_srq_size);
1151         ndev->srq_count = min(ndev->device->num_comp_vectors,
1152                               ndev->device->attrs.max_srq);
1153
1154         ndev->srqs = kcalloc(ndev->srq_count, sizeof(*ndev->srqs), GFP_KERNEL);
1155         if (!ndev->srqs)
1156                 return -ENOMEM;
1157
1158         for (i = 0; i < ndev->srq_count; i++) {
1159                 ndev->srqs[i] = nvmet_rdma_init_srq(ndev);
1160                 if (IS_ERR(ndev->srqs[i])) {
1161                         ret = PTR_ERR(ndev->srqs[i]);
1162                         goto err_srq;
1163                 }
1164         }
1165
1166         return 0;
1167
1168 err_srq:
1169         while (--i >= 0)
1170                 nvmet_rdma_destroy_srq(ndev->srqs[i]);
1171         kfree(ndev->srqs);
1172         return ret;
1173 }
1174
1175 static void nvmet_rdma_free_dev(struct kref *ref)
1176 {
1177         struct nvmet_rdma_device *ndev =
1178                 container_of(ref, struct nvmet_rdma_device, ref);
1179
1180         mutex_lock(&device_list_mutex);
1181         list_del(&ndev->entry);
1182         mutex_unlock(&device_list_mutex);
1183
1184         nvmet_rdma_destroy_srqs(ndev);
1185         ib_dealloc_pd(ndev->pd);
1186
1187         kfree(ndev);
1188 }
1189
1190 static struct nvmet_rdma_device *
1191 nvmet_rdma_find_get_device(struct rdma_cm_id *cm_id)
1192 {
1193         struct nvmet_rdma_port *port = cm_id->context;
1194         struct nvmet_port *nport = port->nport;
1195         struct nvmet_rdma_device *ndev;
1196         int inline_page_count;
1197         int inline_sge_count;
1198         int ret;
1199
1200         mutex_lock(&device_list_mutex);
1201         list_for_each_entry(ndev, &device_list, entry) {
1202                 if (ndev->device->node_guid == cm_id->device->node_guid &&
1203                     kref_get_unless_zero(&ndev->ref))
1204                         goto out_unlock;
1205         }
1206
1207         ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
1208         if (!ndev)
1209                 goto out_err;
1210
1211         inline_page_count = num_pages(nport->inline_data_size);
1212         inline_sge_count = max(cm_id->device->attrs.max_sge_rd,
1213                                 cm_id->device->attrs.max_recv_sge) - 1;
1214         if (inline_page_count > inline_sge_count) {
1215                 pr_warn("inline_data_size %d cannot be supported by device %s. Reducing to %lu.\n",
1216                         nport->inline_data_size, cm_id->device->name,
1217                         inline_sge_count * PAGE_SIZE);
1218                 nport->inline_data_size = inline_sge_count * PAGE_SIZE;
1219                 inline_page_count = inline_sge_count;
1220         }
1221         ndev->inline_data_size = nport->inline_data_size;
1222         ndev->inline_page_count = inline_page_count;
1223         ndev->device = cm_id->device;
1224         kref_init(&ndev->ref);
1225
1226         ndev->pd = ib_alloc_pd(ndev->device, 0);
1227         if (IS_ERR(ndev->pd))
1228                 goto out_free_dev;
1229
1230         if (nvmet_rdma_use_srq) {
1231                 ret = nvmet_rdma_init_srqs(ndev);
1232                 if (ret)
1233                         goto out_free_pd;
1234         }
1235
1236         list_add(&ndev->entry, &device_list);
1237 out_unlock:
1238         mutex_unlock(&device_list_mutex);
1239         pr_debug("added %s.\n", ndev->device->name);
1240         return ndev;
1241
1242 out_free_pd:
1243         ib_dealloc_pd(ndev->pd);
1244 out_free_dev:
1245         kfree(ndev);
1246 out_err:
1247         mutex_unlock(&device_list_mutex);
1248         return NULL;
1249 }
1250
1251 static int nvmet_rdma_create_queue_ib(struct nvmet_rdma_queue *queue)
1252 {
1253         struct ib_qp_init_attr qp_attr;
1254         struct nvmet_rdma_device *ndev = queue->dev;
1255         int nr_cqe, ret, i, factor;
1256
1257         /*
1258          * Reserve CQ slots for RECV + RDMA_READ/RDMA_WRITE + RDMA_SEND.
1259          */
1260         nr_cqe = queue->recv_queue_size + 2 * queue->send_queue_size;
1261
1262         queue->cq = ib_cq_pool_get(ndev->device, nr_cqe + 1,
1263                                    queue->comp_vector, IB_POLL_WORKQUEUE);
1264         if (IS_ERR(queue->cq)) {
1265                 ret = PTR_ERR(queue->cq);
1266                 pr_err("failed to create CQ cqe= %d ret= %d\n",
1267                        nr_cqe + 1, ret);
1268                 goto out;
1269         }
1270
1271         memset(&qp_attr, 0, sizeof(qp_attr));
1272         qp_attr.qp_context = queue;
1273         qp_attr.event_handler = nvmet_rdma_qp_event;
1274         qp_attr.send_cq = queue->cq;
1275         qp_attr.recv_cq = queue->cq;
1276         qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
1277         qp_attr.qp_type = IB_QPT_RC;
1278         /* +1 for drain */
1279         qp_attr.cap.max_send_wr = queue->send_queue_size + 1;
1280         factor = rdma_rw_mr_factor(ndev->device, queue->cm_id->port_num,
1281                                    1 << NVMET_RDMA_MAX_MDTS);
1282         qp_attr.cap.max_rdma_ctxs = queue->send_queue_size * factor;
1283         qp_attr.cap.max_send_sge = max(ndev->device->attrs.max_sge_rd,
1284                                         ndev->device->attrs.max_send_sge);
1285
1286         if (queue->nsrq) {
1287                 qp_attr.srq = queue->nsrq->srq;
1288         } else {
1289                 /* +1 for drain */
1290                 qp_attr.cap.max_recv_wr = 1 + queue->recv_queue_size;
1291                 qp_attr.cap.max_recv_sge = 1 + ndev->inline_page_count;
1292         }
1293
1294         if (queue->port->pi_enable && queue->host_qid)
1295                 qp_attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN;
1296
1297         ret = rdma_create_qp(queue->cm_id, ndev->pd, &qp_attr);
1298         if (ret) {
1299                 pr_err("failed to create_qp ret= %d\n", ret);
1300                 goto err_destroy_cq;
1301         }
1302         queue->qp = queue->cm_id->qp;
1303
1304         atomic_set(&queue->sq_wr_avail, qp_attr.cap.max_send_wr);
1305
1306         pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
1307                  __func__, queue->cq->cqe, qp_attr.cap.max_send_sge,
1308                  qp_attr.cap.max_send_wr, queue->cm_id);
1309
1310         if (!queue->nsrq) {
1311                 for (i = 0; i < queue->recv_queue_size; i++) {
1312                         queue->cmds[i].queue = queue;
1313                         ret = nvmet_rdma_post_recv(ndev, &queue->cmds[i]);
1314                         if (ret)
1315                                 goto err_destroy_qp;
1316                 }
1317         }
1318
1319 out:
1320         return ret;
1321
1322 err_destroy_qp:
1323         rdma_destroy_qp(queue->cm_id);
1324 err_destroy_cq:
1325         ib_cq_pool_put(queue->cq, nr_cqe + 1);
1326         goto out;
1327 }
1328
1329 static void nvmet_rdma_destroy_queue_ib(struct nvmet_rdma_queue *queue)
1330 {
1331         ib_drain_qp(queue->qp);
1332         if (queue->cm_id)
1333                 rdma_destroy_id(queue->cm_id);
1334         ib_destroy_qp(queue->qp);
1335         ib_cq_pool_put(queue->cq, queue->recv_queue_size + 2 *
1336                        queue->send_queue_size + 1);
1337 }
1338
1339 static void nvmet_rdma_free_queue(struct nvmet_rdma_queue *queue)
1340 {
1341         pr_debug("freeing queue %d\n", queue->idx);
1342
1343         nvmet_sq_destroy(&queue->nvme_sq);
1344
1345         nvmet_rdma_destroy_queue_ib(queue);
1346         if (!queue->nsrq) {
1347                 nvmet_rdma_free_cmds(queue->dev, queue->cmds,
1348                                 queue->recv_queue_size,
1349                                 !queue->host_qid);
1350         }
1351         nvmet_rdma_free_rsps(queue);
1352         ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx);
1353         kfree(queue);
1354 }
1355
1356 static void nvmet_rdma_release_queue_work(struct work_struct *w)
1357 {
1358         struct nvmet_rdma_queue *queue =
1359                 container_of(w, struct nvmet_rdma_queue, release_work);
1360         struct nvmet_rdma_device *dev = queue->dev;
1361
1362         nvmet_rdma_free_queue(queue);
1363
1364         kref_put(&dev->ref, nvmet_rdma_free_dev);
1365 }
1366
1367 static int
1368 nvmet_rdma_parse_cm_connect_req(struct rdma_conn_param *conn,
1369                                 struct nvmet_rdma_queue *queue)
1370 {
1371         struct nvme_rdma_cm_req *req;
1372
1373         req = (struct nvme_rdma_cm_req *)conn->private_data;
1374         if (!req || conn->private_data_len == 0)
1375                 return NVME_RDMA_CM_INVALID_LEN;
1376
1377         if (le16_to_cpu(req->recfmt) != NVME_RDMA_CM_FMT_1_0)
1378                 return NVME_RDMA_CM_INVALID_RECFMT;
1379
1380         queue->host_qid = le16_to_cpu(req->qid);
1381
1382         /*
1383          * req->hsqsize corresponds to our recv queue size plus 1
1384          * req->hrqsize corresponds to our send queue size
1385          */
1386         queue->recv_queue_size = le16_to_cpu(req->hsqsize) + 1;
1387         queue->send_queue_size = le16_to_cpu(req->hrqsize);
1388
1389         if (!queue->host_qid && queue->recv_queue_size > NVME_AQ_DEPTH)
1390                 return NVME_RDMA_CM_INVALID_HSQSIZE;
1391
1392         /* XXX: Should we enforce some kind of max for IO queues? */
1393
1394         return 0;
1395 }
1396
1397 static int nvmet_rdma_cm_reject(struct rdma_cm_id *cm_id,
1398                                 enum nvme_rdma_cm_status status)
1399 {
1400         struct nvme_rdma_cm_rej rej;
1401
1402         pr_debug("rejecting connect request: status %d (%s)\n",
1403                  status, nvme_rdma_cm_msg(status));
1404
1405         rej.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1406         rej.sts = cpu_to_le16(status);
1407
1408         return rdma_reject(cm_id, (void *)&rej, sizeof(rej),
1409                            IB_CM_REJ_CONSUMER_DEFINED);
1410 }
1411
1412 static struct nvmet_rdma_queue *
1413 nvmet_rdma_alloc_queue(struct nvmet_rdma_device *ndev,
1414                 struct rdma_cm_id *cm_id,
1415                 struct rdma_cm_event *event)
1416 {
1417         struct nvmet_rdma_port *port = cm_id->context;
1418         struct nvmet_rdma_queue *queue;
1419         int ret;
1420
1421         queue = kzalloc(sizeof(*queue), GFP_KERNEL);
1422         if (!queue) {
1423                 ret = NVME_RDMA_CM_NO_RSC;
1424                 goto out_reject;
1425         }
1426
1427         ret = nvmet_sq_init(&queue->nvme_sq);
1428         if (ret) {
1429                 ret = NVME_RDMA_CM_NO_RSC;
1430                 goto out_free_queue;
1431         }
1432
1433         ret = nvmet_rdma_parse_cm_connect_req(&event->param.conn, queue);
1434         if (ret)
1435                 goto out_destroy_sq;
1436
1437         /*
1438          * Schedules the actual release because calling rdma_destroy_id from
1439          * inside a CM callback would trigger a deadlock. (great API design..)
1440          */
1441         INIT_WORK(&queue->release_work, nvmet_rdma_release_queue_work);
1442         queue->dev = ndev;
1443         queue->cm_id = cm_id;
1444         queue->port = port->nport;
1445
1446         spin_lock_init(&queue->state_lock);
1447         queue->state = NVMET_RDMA_Q_CONNECTING;
1448         INIT_LIST_HEAD(&queue->rsp_wait_list);
1449         INIT_LIST_HEAD(&queue->rsp_wr_wait_list);
1450         spin_lock_init(&queue->rsp_wr_wait_lock);
1451         INIT_LIST_HEAD(&queue->free_rsps);
1452         spin_lock_init(&queue->rsps_lock);
1453         INIT_LIST_HEAD(&queue->queue_list);
1454
1455         queue->idx = ida_simple_get(&nvmet_rdma_queue_ida, 0, 0, GFP_KERNEL);
1456         if (queue->idx < 0) {
1457                 ret = NVME_RDMA_CM_NO_RSC;
1458                 goto out_destroy_sq;
1459         }
1460
1461         /*
1462          * Spread the io queues across completion vectors,
1463          * but still keep all admin queues on vector 0.
1464          */
1465         queue->comp_vector = !queue->host_qid ? 0 :
1466                 queue->idx % ndev->device->num_comp_vectors;
1467
1468
1469         ret = nvmet_rdma_alloc_rsps(queue);
1470         if (ret) {
1471                 ret = NVME_RDMA_CM_NO_RSC;
1472                 goto out_ida_remove;
1473         }
1474
1475         if (ndev->srqs) {
1476                 queue->nsrq = ndev->srqs[queue->comp_vector % ndev->srq_count];
1477         } else {
1478                 queue->cmds = nvmet_rdma_alloc_cmds(ndev,
1479                                 queue->recv_queue_size,
1480                                 !queue->host_qid);
1481                 if (IS_ERR(queue->cmds)) {
1482                         ret = NVME_RDMA_CM_NO_RSC;
1483                         goto out_free_responses;
1484                 }
1485         }
1486
1487         ret = nvmet_rdma_create_queue_ib(queue);
1488         if (ret) {
1489                 pr_err("%s: creating RDMA queue failed (%d).\n",
1490                         __func__, ret);
1491                 ret = NVME_RDMA_CM_NO_RSC;
1492                 goto out_free_cmds;
1493         }
1494
1495         return queue;
1496
1497 out_free_cmds:
1498         if (!queue->nsrq) {
1499                 nvmet_rdma_free_cmds(queue->dev, queue->cmds,
1500                                 queue->recv_queue_size,
1501                                 !queue->host_qid);
1502         }
1503 out_free_responses:
1504         nvmet_rdma_free_rsps(queue);
1505 out_ida_remove:
1506         ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx);
1507 out_destroy_sq:
1508         nvmet_sq_destroy(&queue->nvme_sq);
1509 out_free_queue:
1510         kfree(queue);
1511 out_reject:
1512         nvmet_rdma_cm_reject(cm_id, ret);
1513         return NULL;
1514 }
1515
1516 static void nvmet_rdma_qp_event(struct ib_event *event, void *priv)
1517 {
1518         struct nvmet_rdma_queue *queue = priv;
1519
1520         switch (event->event) {
1521         case IB_EVENT_COMM_EST:
1522                 rdma_notify(queue->cm_id, event->event);
1523                 break;
1524         case IB_EVENT_QP_LAST_WQE_REACHED:
1525                 pr_debug("received last WQE reached event for queue=0x%p\n",
1526                          queue);
1527                 break;
1528         default:
1529                 pr_err("received IB QP event: %s (%d)\n",
1530                        ib_event_msg(event->event), event->event);
1531                 break;
1532         }
1533 }
1534
1535 static int nvmet_rdma_cm_accept(struct rdma_cm_id *cm_id,
1536                 struct nvmet_rdma_queue *queue,
1537                 struct rdma_conn_param *p)
1538 {
1539         struct rdma_conn_param  param = { };
1540         struct nvme_rdma_cm_rep priv = { };
1541         int ret = -ENOMEM;
1542
1543         param.rnr_retry_count = 7;
1544         param.flow_control = 1;
1545         param.initiator_depth = min_t(u8, p->initiator_depth,
1546                 queue->dev->device->attrs.max_qp_init_rd_atom);
1547         param.private_data = &priv;
1548         param.private_data_len = sizeof(priv);
1549         priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1550         priv.crqsize = cpu_to_le16(queue->recv_queue_size);
1551
1552         ret = rdma_accept(cm_id, &param);
1553         if (ret)
1554                 pr_err("rdma_accept failed (error code = %d)\n", ret);
1555
1556         return ret;
1557 }
1558
1559 static int nvmet_rdma_queue_connect(struct rdma_cm_id *cm_id,
1560                 struct rdma_cm_event *event)
1561 {
1562         struct nvmet_rdma_device *ndev;
1563         struct nvmet_rdma_queue *queue;
1564         int ret = -EINVAL;
1565
1566         ndev = nvmet_rdma_find_get_device(cm_id);
1567         if (!ndev) {
1568                 nvmet_rdma_cm_reject(cm_id, NVME_RDMA_CM_NO_RSC);
1569                 return -ECONNREFUSED;
1570         }
1571
1572         queue = nvmet_rdma_alloc_queue(ndev, cm_id, event);
1573         if (!queue) {
1574                 ret = -ENOMEM;
1575                 goto put_device;
1576         }
1577
1578         if (queue->host_qid == 0) {
1579                 /* Let inflight controller teardown complete */
1580                 flush_scheduled_work();
1581         }
1582
1583         ret = nvmet_rdma_cm_accept(cm_id, queue, &event->param.conn);
1584         if (ret) {
1585                 /*
1586                  * Don't destroy the cm_id in free path, as we implicitly
1587                  * destroy the cm_id here with non-zero ret code.
1588                  */
1589                 queue->cm_id = NULL;
1590                 goto free_queue;
1591         }
1592
1593         mutex_lock(&nvmet_rdma_queue_mutex);
1594         list_add_tail(&queue->queue_list, &nvmet_rdma_queue_list);
1595         mutex_unlock(&nvmet_rdma_queue_mutex);
1596
1597         return 0;
1598
1599 free_queue:
1600         nvmet_rdma_free_queue(queue);
1601 put_device:
1602         kref_put(&ndev->ref, nvmet_rdma_free_dev);
1603
1604         return ret;
1605 }
1606
1607 static void nvmet_rdma_queue_established(struct nvmet_rdma_queue *queue)
1608 {
1609         unsigned long flags;
1610
1611         spin_lock_irqsave(&queue->state_lock, flags);
1612         if (queue->state != NVMET_RDMA_Q_CONNECTING) {
1613                 pr_warn("trying to establish a connected queue\n");
1614                 goto out_unlock;
1615         }
1616         queue->state = NVMET_RDMA_Q_LIVE;
1617
1618         while (!list_empty(&queue->rsp_wait_list)) {
1619                 struct nvmet_rdma_rsp *cmd;
1620
1621                 cmd = list_first_entry(&queue->rsp_wait_list,
1622                                         struct nvmet_rdma_rsp, wait_list);
1623                 list_del(&cmd->wait_list);
1624
1625                 spin_unlock_irqrestore(&queue->state_lock, flags);
1626                 nvmet_rdma_handle_command(queue, cmd);
1627                 spin_lock_irqsave(&queue->state_lock, flags);
1628         }
1629
1630 out_unlock:
1631         spin_unlock_irqrestore(&queue->state_lock, flags);
1632 }
1633
1634 static void __nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
1635 {
1636         bool disconnect = false;
1637         unsigned long flags;
1638
1639         pr_debug("cm_id= %p queue->state= %d\n", queue->cm_id, queue->state);
1640
1641         spin_lock_irqsave(&queue->state_lock, flags);
1642         switch (queue->state) {
1643         case NVMET_RDMA_Q_CONNECTING:
1644         case NVMET_RDMA_Q_LIVE:
1645                 queue->state = NVMET_RDMA_Q_DISCONNECTING;
1646                 disconnect = true;
1647                 break;
1648         case NVMET_RDMA_Q_DISCONNECTING:
1649                 break;
1650         }
1651         spin_unlock_irqrestore(&queue->state_lock, flags);
1652
1653         if (disconnect) {
1654                 rdma_disconnect(queue->cm_id);
1655                 schedule_work(&queue->release_work);
1656         }
1657 }
1658
1659 static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
1660 {
1661         bool disconnect = false;
1662
1663         mutex_lock(&nvmet_rdma_queue_mutex);
1664         if (!list_empty(&queue->queue_list)) {
1665                 list_del_init(&queue->queue_list);
1666                 disconnect = true;
1667         }
1668         mutex_unlock(&nvmet_rdma_queue_mutex);
1669
1670         if (disconnect)
1671                 __nvmet_rdma_queue_disconnect(queue);
1672 }
1673
1674 static void nvmet_rdma_queue_connect_fail(struct rdma_cm_id *cm_id,
1675                 struct nvmet_rdma_queue *queue)
1676 {
1677         WARN_ON_ONCE(queue->state != NVMET_RDMA_Q_CONNECTING);
1678
1679         mutex_lock(&nvmet_rdma_queue_mutex);
1680         if (!list_empty(&queue->queue_list))
1681                 list_del_init(&queue->queue_list);
1682         mutex_unlock(&nvmet_rdma_queue_mutex);
1683
1684         pr_err("failed to connect queue %d\n", queue->idx);
1685         schedule_work(&queue->release_work);
1686 }
1687
1688 /**
1689  * nvme_rdma_device_removal() - Handle RDMA device removal
1690  * @cm_id:      rdma_cm id, used for nvmet port
1691  * @queue:      nvmet rdma queue (cm id qp_context)
1692  *
1693  * DEVICE_REMOVAL event notifies us that the RDMA device is about
1694  * to unplug. Note that this event can be generated on a normal
1695  * queue cm_id and/or a device bound listener cm_id (where in this
1696  * case queue will be null).
1697  *
1698  * We registered an ib_client to handle device removal for queues,
1699  * so we only need to handle the listening port cm_ids. In this case
1700  * we nullify the priv to prevent double cm_id destruction and destroying
1701  * the cm_id implicitely by returning a non-zero rc to the callout.
1702  */
1703 static int nvmet_rdma_device_removal(struct rdma_cm_id *cm_id,
1704                 struct nvmet_rdma_queue *queue)
1705 {
1706         struct nvmet_rdma_port *port;
1707
1708         if (queue) {
1709                 /*
1710                  * This is a queue cm_id. we have registered
1711                  * an ib_client to handle queues removal
1712                  * so don't interfear and just return.
1713                  */
1714                 return 0;
1715         }
1716
1717         port = cm_id->context;
1718
1719         /*
1720          * This is a listener cm_id. Make sure that
1721          * future remove_port won't invoke a double
1722          * cm_id destroy. use atomic xchg to make sure
1723          * we don't compete with remove_port.
1724          */
1725         if (xchg(&port->cm_id, NULL) != cm_id)
1726                 return 0;
1727
1728         /*
1729          * We need to return 1 so that the core will destroy
1730          * it's own ID.  What a great API design..
1731          */
1732         return 1;
1733 }
1734
1735 static int nvmet_rdma_cm_handler(struct rdma_cm_id *cm_id,
1736                 struct rdma_cm_event *event)
1737 {
1738         struct nvmet_rdma_queue *queue = NULL;
1739         int ret = 0;
1740
1741         if (cm_id->qp)
1742                 queue = cm_id->qp->qp_context;
1743
1744         pr_debug("%s (%d): status %d id %p\n",
1745                 rdma_event_msg(event->event), event->event,
1746                 event->status, cm_id);
1747
1748         switch (event->event) {
1749         case RDMA_CM_EVENT_CONNECT_REQUEST:
1750                 ret = nvmet_rdma_queue_connect(cm_id, event);
1751                 break;
1752         case RDMA_CM_EVENT_ESTABLISHED:
1753                 nvmet_rdma_queue_established(queue);
1754                 break;
1755         case RDMA_CM_EVENT_ADDR_CHANGE:
1756                 if (!queue) {
1757                         struct nvmet_rdma_port *port = cm_id->context;
1758
1759                         schedule_delayed_work(&port->repair_work, 0);
1760                         break;
1761                 }
1762                 fallthrough;
1763         case RDMA_CM_EVENT_DISCONNECTED:
1764         case RDMA_CM_EVENT_TIMEWAIT_EXIT:
1765                 nvmet_rdma_queue_disconnect(queue);
1766                 break;
1767         case RDMA_CM_EVENT_DEVICE_REMOVAL:
1768                 ret = nvmet_rdma_device_removal(cm_id, queue);
1769                 break;
1770         case RDMA_CM_EVENT_REJECTED:
1771                 pr_debug("Connection rejected: %s\n",
1772                          rdma_reject_msg(cm_id, event->status));
1773                 fallthrough;
1774         case RDMA_CM_EVENT_UNREACHABLE:
1775         case RDMA_CM_EVENT_CONNECT_ERROR:
1776                 nvmet_rdma_queue_connect_fail(cm_id, queue);
1777                 break;
1778         default:
1779                 pr_err("received unrecognized RDMA CM event %d\n",
1780                         event->event);
1781                 break;
1782         }
1783
1784         return ret;
1785 }
1786
1787 static void nvmet_rdma_delete_ctrl(struct nvmet_ctrl *ctrl)
1788 {
1789         struct nvmet_rdma_queue *queue;
1790
1791 restart:
1792         mutex_lock(&nvmet_rdma_queue_mutex);
1793         list_for_each_entry(queue, &nvmet_rdma_queue_list, queue_list) {
1794                 if (queue->nvme_sq.ctrl == ctrl) {
1795                         list_del_init(&queue->queue_list);
1796                         mutex_unlock(&nvmet_rdma_queue_mutex);
1797
1798                         __nvmet_rdma_queue_disconnect(queue);
1799                         goto restart;
1800                 }
1801         }
1802         mutex_unlock(&nvmet_rdma_queue_mutex);
1803 }
1804
1805 static void nvmet_rdma_disable_port(struct nvmet_rdma_port *port)
1806 {
1807         struct rdma_cm_id *cm_id = xchg(&port->cm_id, NULL);
1808
1809         if (cm_id)
1810                 rdma_destroy_id(cm_id);
1811 }
1812
1813 static int nvmet_rdma_enable_port(struct nvmet_rdma_port *port)
1814 {
1815         struct sockaddr *addr = (struct sockaddr *)&port->addr;
1816         struct rdma_cm_id *cm_id;
1817         int ret;
1818
1819         cm_id = rdma_create_id(&init_net, nvmet_rdma_cm_handler, port,
1820                         RDMA_PS_TCP, IB_QPT_RC);
1821         if (IS_ERR(cm_id)) {
1822                 pr_err("CM ID creation failed\n");
1823                 return PTR_ERR(cm_id);
1824         }
1825
1826         /*
1827          * Allow both IPv4 and IPv6 sockets to bind a single port
1828          * at the same time.
1829          */
1830         ret = rdma_set_afonly(cm_id, 1);
1831         if (ret) {
1832                 pr_err("rdma_set_afonly failed (%d)\n", ret);
1833                 goto out_destroy_id;
1834         }
1835
1836         ret = rdma_bind_addr(cm_id, addr);
1837         if (ret) {
1838                 pr_err("binding CM ID to %pISpcs failed (%d)\n", addr, ret);
1839                 goto out_destroy_id;
1840         }
1841
1842         ret = rdma_listen(cm_id, 128);
1843         if (ret) {
1844                 pr_err("listening to %pISpcs failed (%d)\n", addr, ret);
1845                 goto out_destroy_id;
1846         }
1847
1848         if (port->nport->pi_enable &&
1849             !(cm_id->device->attrs.device_cap_flags &
1850               IB_DEVICE_INTEGRITY_HANDOVER)) {
1851                 pr_err("T10-PI is not supported for %pISpcs\n", addr);
1852                 ret = -EINVAL;
1853                 goto out_destroy_id;
1854         }
1855
1856         port->cm_id = cm_id;
1857         return 0;
1858
1859 out_destroy_id:
1860         rdma_destroy_id(cm_id);
1861         return ret;
1862 }
1863
1864 static void nvmet_rdma_repair_port_work(struct work_struct *w)
1865 {
1866         struct nvmet_rdma_port *port = container_of(to_delayed_work(w),
1867                         struct nvmet_rdma_port, repair_work);
1868         int ret;
1869
1870         nvmet_rdma_disable_port(port);
1871         ret = nvmet_rdma_enable_port(port);
1872         if (ret)
1873                 schedule_delayed_work(&port->repair_work, 5 * HZ);
1874 }
1875
1876 static int nvmet_rdma_add_port(struct nvmet_port *nport)
1877 {
1878         struct nvmet_rdma_port *port;
1879         __kernel_sa_family_t af;
1880         int ret;
1881
1882         port = kzalloc(sizeof(*port), GFP_KERNEL);
1883         if (!port)
1884                 return -ENOMEM;
1885
1886         nport->priv = port;
1887         port->nport = nport;
1888         INIT_DELAYED_WORK(&port->repair_work, nvmet_rdma_repair_port_work);
1889
1890         switch (nport->disc_addr.adrfam) {
1891         case NVMF_ADDR_FAMILY_IP4:
1892                 af = AF_INET;
1893                 break;
1894         case NVMF_ADDR_FAMILY_IP6:
1895                 af = AF_INET6;
1896                 break;
1897         default:
1898                 pr_err("address family %d not supported\n",
1899                         nport->disc_addr.adrfam);
1900                 ret = -EINVAL;
1901                 goto out_free_port;
1902         }
1903
1904         if (nport->inline_data_size < 0) {
1905                 nport->inline_data_size = NVMET_RDMA_DEFAULT_INLINE_DATA_SIZE;
1906         } else if (nport->inline_data_size > NVMET_RDMA_MAX_INLINE_DATA_SIZE) {
1907                 pr_warn("inline_data_size %u is too large, reducing to %u\n",
1908                         nport->inline_data_size,
1909                         NVMET_RDMA_MAX_INLINE_DATA_SIZE);
1910                 nport->inline_data_size = NVMET_RDMA_MAX_INLINE_DATA_SIZE;
1911         }
1912
1913         ret = inet_pton_with_scope(&init_net, af, nport->disc_addr.traddr,
1914                         nport->disc_addr.trsvcid, &port->addr);
1915         if (ret) {
1916                 pr_err("malformed ip/port passed: %s:%s\n",
1917                         nport->disc_addr.traddr, nport->disc_addr.trsvcid);
1918                 goto out_free_port;
1919         }
1920
1921         ret = nvmet_rdma_enable_port(port);
1922         if (ret)
1923                 goto out_free_port;
1924
1925         pr_info("enabling port %d (%pISpcs)\n",
1926                 le16_to_cpu(nport->disc_addr.portid),
1927                 (struct sockaddr *)&port->addr);
1928
1929         return 0;
1930
1931 out_free_port:
1932         kfree(port);
1933         return ret;
1934 }
1935
1936 static void nvmet_rdma_remove_port(struct nvmet_port *nport)
1937 {
1938         struct nvmet_rdma_port *port = nport->priv;
1939
1940         cancel_delayed_work_sync(&port->repair_work);
1941         nvmet_rdma_disable_port(port);
1942         kfree(port);
1943 }
1944
1945 static void nvmet_rdma_disc_port_addr(struct nvmet_req *req,
1946                 struct nvmet_port *nport, char *traddr)
1947 {
1948         struct nvmet_rdma_port *port = nport->priv;
1949         struct rdma_cm_id *cm_id = port->cm_id;
1950
1951         if (inet_addr_is_any((struct sockaddr *)&cm_id->route.addr.src_addr)) {
1952                 struct nvmet_rdma_rsp *rsp =
1953                         container_of(req, struct nvmet_rdma_rsp, req);
1954                 struct rdma_cm_id *req_cm_id = rsp->queue->cm_id;
1955                 struct sockaddr *addr = (void *)&req_cm_id->route.addr.src_addr;
1956
1957                 sprintf(traddr, "%pISc", addr);
1958         } else {
1959                 memcpy(traddr, nport->disc_addr.traddr, NVMF_TRADDR_SIZE);
1960         }
1961 }
1962
1963 static u8 nvmet_rdma_get_mdts(const struct nvmet_ctrl *ctrl)
1964 {
1965         if (ctrl->pi_support)
1966                 return NVMET_RDMA_MAX_METADATA_MDTS;
1967         return NVMET_RDMA_MAX_MDTS;
1968 }
1969
1970 static const struct nvmet_fabrics_ops nvmet_rdma_ops = {
1971         .owner                  = THIS_MODULE,
1972         .type                   = NVMF_TRTYPE_RDMA,
1973         .msdbd                  = 1,
1974         .flags                  = NVMF_KEYED_SGLS | NVMF_METADATA_SUPPORTED,
1975         .add_port               = nvmet_rdma_add_port,
1976         .remove_port            = nvmet_rdma_remove_port,
1977         .queue_response         = nvmet_rdma_queue_response,
1978         .delete_ctrl            = nvmet_rdma_delete_ctrl,
1979         .disc_traddr            = nvmet_rdma_disc_port_addr,
1980         .get_mdts               = nvmet_rdma_get_mdts,
1981 };
1982
1983 static void nvmet_rdma_remove_one(struct ib_device *ib_device, void *client_data)
1984 {
1985         struct nvmet_rdma_queue *queue, *tmp;
1986         struct nvmet_rdma_device *ndev;
1987         bool found = false;
1988
1989         mutex_lock(&device_list_mutex);
1990         list_for_each_entry(ndev, &device_list, entry) {
1991                 if (ndev->device == ib_device) {
1992                         found = true;
1993                         break;
1994                 }
1995         }
1996         mutex_unlock(&device_list_mutex);
1997
1998         if (!found)
1999                 return;
2000
2001         /*
2002          * IB Device that is used by nvmet controllers is being removed,
2003          * delete all queues using this device.
2004          */
2005         mutex_lock(&nvmet_rdma_queue_mutex);
2006         list_for_each_entry_safe(queue, tmp, &nvmet_rdma_queue_list,
2007                                  queue_list) {
2008                 if (queue->dev->device != ib_device)
2009                         continue;
2010
2011                 pr_info("Removing queue %d\n", queue->idx);
2012                 list_del_init(&queue->queue_list);
2013                 __nvmet_rdma_queue_disconnect(queue);
2014         }
2015         mutex_unlock(&nvmet_rdma_queue_mutex);
2016
2017         flush_scheduled_work();
2018 }
2019
2020 static struct ib_client nvmet_rdma_ib_client = {
2021         .name   = "nvmet_rdma",
2022         .remove = nvmet_rdma_remove_one
2023 };
2024
2025 static int __init nvmet_rdma_init(void)
2026 {
2027         int ret;
2028
2029         ret = ib_register_client(&nvmet_rdma_ib_client);
2030         if (ret)
2031                 return ret;
2032
2033         ret = nvmet_register_transport(&nvmet_rdma_ops);
2034         if (ret)
2035                 goto err_ib_client;
2036
2037         return 0;
2038
2039 err_ib_client:
2040         ib_unregister_client(&nvmet_rdma_ib_client);
2041         return ret;
2042 }
2043
2044 static void __exit nvmet_rdma_exit(void)
2045 {
2046         nvmet_unregister_transport(&nvmet_rdma_ops);
2047         ib_unregister_client(&nvmet_rdma_ib_client);
2048         WARN_ON_ONCE(!list_empty(&nvmet_rdma_queue_list));
2049         ida_destroy(&nvmet_rdma_queue_ida);
2050 }
2051
2052 module_init(nvmet_rdma_init);
2053 module_exit(nvmet_rdma_exit);
2054
2055 MODULE_LICENSE("GPL v2");
2056 MODULE_ALIAS("nvmet-transport-1"); /* 1 == NVMF_TRTYPE_RDMA */