drivers/infiniband/ulp/isert/ib_isert.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * This file contains iSCSI extentions for RDMA (iSER) Verbs
   4  *
   5  * (c) Copyright 2013 Datera, Inc.
   6  *
   7  * Nicholas A. Bellinger <nab@linux-iscsi.org>
   8  *
   9  ****************************************************************************/
  10
  11 #include <linux/string.h>
  12 #include <linux/module.h>
  13 #include <linux/scatterlist.h>
  14 #include <linux/socket.h>
  15 #include <linux/in.h>
  16 #include <linux/in6.h>
  17 #include <rdma/ib_verbs.h>
  18 #include <rdma/rdma_cm.h>
  19 #include <target/target_core_base.h>
  20 #include <target/target_core_fabric.h>
  21 #include <target/iscsi/iscsi_transport.h>
  22 #include <linux/semaphore.h>
  23
  24 #include "ib_isert.h"
  25
  26 #define ISERT_MAX_CONN          8
  27 #define ISER_MAX_RX_CQ_LEN      (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
  28 #define ISER_MAX_TX_CQ_LEN \
  29         ((ISERT_QP_MAX_REQ_DTOS + ISCSI_DEF_XMIT_CMDS_MAX) * ISERT_MAX_CONN)
  30 #define ISER_MAX_CQ_LEN         (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \
  31                                  ISERT_MAX_CONN)
  32
  33 static int isert_debug_level;
  34 module_param_named(debug_level, isert_debug_level, int, 0644);
  35 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
  36
  37 static DEFINE_MUTEX(device_list_mutex);
  38 static LIST_HEAD(device_list);
  39 static struct workqueue_struct *isert_comp_wq;
  40 static struct workqueue_struct *isert_release_wq;
  41
  42 static int
  43 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
  44 static int
  45 isert_login_post_recv(struct isert_conn *isert_conn);
  46 static int
  47 isert_rdma_accept(struct isert_conn *isert_conn);
  48 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
  49
  50 static void isert_release_work(struct work_struct *work);
  51 static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc);
  52 static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
  53 static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
  54 static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc);
  55
  56 static inline bool
  57 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
  58 {
  59         return (conn->pi_support &&
  60                 cmd->prot_op != TARGET_PROT_NORMAL);
  61 }
  62
  63
  64 static void
  65 isert_qp_event_callback(struct ib_event *e, void *context)
  66 {
  67         struct isert_conn *isert_conn = context;
  68
  69         isert_err("%s (%d): conn %p\n",
  70                   ib_event_msg(e->event), e->event, isert_conn);
  71
  72         switch (e->event) {
  73         case IB_EVENT_COMM_EST:
  74                 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
  75                 break;
  76         case IB_EVENT_QP_LAST_WQE_REACHED:
  77                 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
  78                 break;
  79         default:
  80                 break;
  81         }
  82 }
  83
  84 static struct isert_comp *
  85 isert_comp_get(struct isert_conn *isert_conn)
  86 {
  87         struct isert_device *device = isert_conn->device;
  88         struct isert_comp *comp;
  89         int i, min = 0;
  90
  91         mutex_lock(&device_list_mutex);
  92         for (i = 0; i < device->comps_used; i++)
  93                 if (device->comps[i].active_qps <
  94                     device->comps[min].active_qps)
  95                         min = i;
  96         comp = &device->comps[min];
  97         comp->active_qps++;
  98         mutex_unlock(&device_list_mutex);
  99
 100         isert_info("conn %p, using comp %p min_index: %d\n",
 101                    isert_conn, comp, min);
 102
 103         return comp;
 104 }
 105
 106 static void
 107 isert_comp_put(struct isert_comp *comp)
 108 {
 109         mutex_lock(&device_list_mutex);
 110         comp->active_qps--;
 111         mutex_unlock(&device_list_mutex);
 112 }
 113
 114 static struct ib_qp *
 115 isert_create_qp(struct isert_conn *isert_conn,
 116                 struct isert_comp *comp,
 117                 struct rdma_cm_id *cma_id)
 118 {
 119         struct isert_device *device = isert_conn->device;
 120         struct ib_qp_init_attr attr;
 121         int ret;
 122
 123         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 124         attr.event_handler = isert_qp_event_callback;
 125         attr.qp_context = isert_conn;
 126         attr.send_cq = comp->cq;
 127         attr.recv_cq = comp->cq;
 128         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1;
 129         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
 130         attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX;
 131         attr.cap.max_send_sge = device->ib_device->attrs.max_send_sge;
 132         attr.cap.max_recv_sge = 1;
 133         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 134         attr.qp_type = IB_QPT_RC;
 135         if (device->pi_capable)
 136                 attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN;
 137
 138         ret = rdma_create_qp(cma_id, device->pd, &attr);
 139         if (ret) {
 140                 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
 141                 return ERR_PTR(ret);
 142         }
 143
 144         return cma_id->qp;
 145 }
 146
 147 static int
 148 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
 149 {
 150         struct isert_comp *comp;
 151         int ret;
 152
 153         comp = isert_comp_get(isert_conn);
 154         isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
 155         if (IS_ERR(isert_conn->qp)) {
 156                 ret = PTR_ERR(isert_conn->qp);
 157                 goto err;
 158         }
 159
 160         return 0;
 161 err:
 162         isert_comp_put(comp);
 163         return ret;
 164 }
 165
 166 static int
 167 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 168 {
 169         struct isert_device *device = isert_conn->device;
 170         struct ib_device *ib_dev = device->ib_device;
 171         struct iser_rx_desc *rx_desc;
 172         struct ib_sge *rx_sg;
 173         u64 dma_addr;
 174         int i, j;
 175
 176         isert_conn->rx_descs = kcalloc(ISERT_QP_MAX_RECV_DTOS,
 177                                        sizeof(struct iser_rx_desc),
 178                                        GFP_KERNEL);
 179         if (!isert_conn->rx_descs)
 180                 return -ENOMEM;
 181
 182         rx_desc = isert_conn->rx_descs;
 183
 184         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 185                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 186                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 187                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 188                         goto dma_map_fail;
 189
 190                 rx_desc->dma_addr = dma_addr;
 191
 192                 rx_sg = &rx_desc->rx_sg;
 193                 rx_sg->addr = rx_desc->dma_addr;
 194                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 195                 rx_sg->lkey = device->pd->local_dma_lkey;
 196                 rx_desc->rx_cqe.done = isert_recv_done;
 197         }
 198
 199         return 0;
 200
 201 dma_map_fail:
 202         rx_desc = isert_conn->rx_descs;
 203         for (j = 0; j < i; j++, rx_desc++) {
 204                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 205                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 206         }
 207         kfree(isert_conn->rx_descs);
 208         isert_conn->rx_descs = NULL;
 209         isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
 210         return -ENOMEM;
 211 }
 212
 213 static void
 214 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 215 {
 216         struct ib_device *ib_dev = isert_conn->device->ib_device;
 217         struct iser_rx_desc *rx_desc;
 218         int i;
 219
 220         if (!isert_conn->rx_descs)
 221                 return;
 222
 223         rx_desc = isert_conn->rx_descs;
 224         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 225                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 226                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 227         }
 228
 229         kfree(isert_conn->rx_descs);
 230         isert_conn->rx_descs = NULL;
 231 }
 232
 233 static void
 234 isert_free_comps(struct isert_device *device)
 235 {
 236         int i;
 237
 238         for (i = 0; i < device->comps_used; i++) {
 239                 struct isert_comp *comp = &device->comps[i];
 240
 241                 if (comp->cq)
 242                         ib_free_cq(comp->cq);
 243         }
 244         kfree(device->comps);
 245 }
 246
 247 static int
 248 isert_alloc_comps(struct isert_device *device)
 249 {
 250         int i, max_cqe, ret = 0;
 251
 252         device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
 253                                  device->ib_device->num_comp_vectors));
 254
 255         isert_info("Using %d CQs, %s supports %d vectors support "
 256                    "pi_capable %d\n",
 257                    device->comps_used, dev_name(&device->ib_device->dev),
 258                    device->ib_device->num_comp_vectors,
 259                    device->pi_capable);
 260
 261         device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
 262                                 GFP_KERNEL);
 263         if (!device->comps)
 264                 return -ENOMEM;
 265
 266         max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
 267
 268         for (i = 0; i < device->comps_used; i++) {
 269                 struct isert_comp *comp = &device->comps[i];
 270
 271                 comp->device = device;
 272                 comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i,
 273                                 IB_POLL_WORKQUEUE);
 274                 if (IS_ERR(comp->cq)) {
 275                         isert_err("Unable to allocate cq\n");
 276                         ret = PTR_ERR(comp->cq);
 277                         comp->cq = NULL;
 278                         goto out_cq;
 279                 }
 280         }
 281
 282         return 0;
 283 out_cq:
 284         isert_free_comps(device);
 285         return ret;
 286 }
 287
 288 static int
 289 isert_create_device_ib_res(struct isert_device *device)
 290 {
 291         struct ib_device *ib_dev = device->ib_device;
 292         int ret;
 293
 294         isert_dbg("devattr->max_send_sge: %d devattr->max_recv_sge %d\n",
 295                   ib_dev->attrs.max_send_sge, ib_dev->attrs.max_recv_sge);
 296         isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
 297
 298         ret = isert_alloc_comps(device);
 299         if (ret)
 300                 goto out;
 301
 302         device->pd = ib_alloc_pd(ib_dev, 0);
 303         if (IS_ERR(device->pd)) {
 304                 ret = PTR_ERR(device->pd);
 305                 isert_err("failed to allocate pd, device %p, ret=%d\n",
 306                           device, ret);
 307                 goto out_cq;
 308         }
 309
 310         /* Check signature cap */
 311         device->pi_capable = ib_dev->attrs.device_cap_flags &
 312                              IB_DEVICE_INTEGRITY_HANDOVER ? true : false;
 313
 314         return 0;
 315
 316 out_cq:
 317         isert_free_comps(device);
 318 out:
 319         if (ret > 0)
 320                 ret = -EINVAL;
 321         return ret;
 322 }
 323
 324 static void
 325 isert_free_device_ib_res(struct isert_device *device)
 326 {
 327         isert_info("device %p\n", device);
 328
 329         ib_dealloc_pd(device->pd);
 330         isert_free_comps(device);
 331 }
 332
 333 static void
 334 isert_device_put(struct isert_device *device)
 335 {
 336         mutex_lock(&device_list_mutex);
 337         device->refcount--;
 338         isert_info("device %p refcount %d\n", device, device->refcount);
 339         if (!device->refcount) {
 340                 isert_free_device_ib_res(device);
 341                 list_del(&device->dev_node);
 342                 kfree(device);
 343         }
 344         mutex_unlock(&device_list_mutex);
 345 }
 346
 347 static struct isert_device *
 348 isert_device_get(struct rdma_cm_id *cma_id)
 349 {
 350         struct isert_device *device;
 351         int ret;
 352
 353         mutex_lock(&device_list_mutex);
 354         list_for_each_entry(device, &device_list, dev_node) {
 355                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 356                         device->refcount++;
 357                         isert_info("Found iser device %p refcount %d\n",
 358                                    device, device->refcount);
 359                         mutex_unlock(&device_list_mutex);
 360                         return device;
 361                 }
 362         }
 363
 364         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 365         if (!device) {
 366                 mutex_unlock(&device_list_mutex);
 367                 return ERR_PTR(-ENOMEM);
 368         }
 369
 370         INIT_LIST_HEAD(&device->dev_node);
 371
 372         device->ib_device = cma_id->device;
 373         ret = isert_create_device_ib_res(device);
 374         if (ret) {
 375                 kfree(device);
 376                 mutex_unlock(&device_list_mutex);
 377                 return ERR_PTR(ret);
 378         }
 379
 380         device->refcount++;
 381         list_add_tail(&device->dev_node, &device_list);
 382         isert_info("Created a new iser device %p refcount %d\n",
 383                    device, device->refcount);
 384         mutex_unlock(&device_list_mutex);
 385
 386         return device;
 387 }
 388
 389 static void
 390 isert_init_conn(struct isert_conn *isert_conn)
 391 {
 392         isert_conn->state = ISER_CONN_INIT;
 393         INIT_LIST_HEAD(&isert_conn->node);
 394         init_completion(&isert_conn->login_comp);
 395         init_completion(&isert_conn->login_req_comp);
 396         init_waitqueue_head(&isert_conn->rem_wait);
 397         kref_init(&isert_conn->kref);
 398         mutex_init(&isert_conn->mutex);
 399         INIT_WORK(&isert_conn->release_work, isert_release_work);
 400 }
 401
 402 static void
 403 isert_free_login_buf(struct isert_conn *isert_conn)
 404 {
 405         struct ib_device *ib_dev = isert_conn->device->ib_device;
 406
 407         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 408                             ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
 409         kfree(isert_conn->login_rsp_buf);
 410
 411         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 412                             ISER_RX_PAYLOAD_SIZE,
 413                             DMA_FROM_DEVICE);
 414         kfree(isert_conn->login_req_buf);
 415 }
 416
 417 static int
 418 isert_alloc_login_buf(struct isert_conn *isert_conn,
 419                       struct ib_device *ib_dev)
 420 {
 421         int ret;
 422
 423         isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
 424                         GFP_KERNEL);
 425         if (!isert_conn->login_req_buf)
 426                 return -ENOMEM;
 427
 428         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 429                                 isert_conn->login_req_buf,
 430                                 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 431         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 432         if (ret) {
 433                 isert_err("login_req_dma mapping error: %d\n", ret);
 434                 isert_conn->login_req_dma = 0;
 435                 goto out_free_login_req_buf;
 436         }
 437
 438         isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
 439         if (!isert_conn->login_rsp_buf) {
 440                 ret = -ENOMEM;
 441                 goto out_unmap_login_req_buf;
 442         }
 443
 444         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 445                                         isert_conn->login_rsp_buf,
 446                                         ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
 447         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 448         if (ret) {
 449                 isert_err("login_rsp_dma mapping error: %d\n", ret);
 450                 isert_conn->login_rsp_dma = 0;
 451                 goto out_free_login_rsp_buf;
 452         }
 453
 454         return 0;
 455
 456 out_free_login_rsp_buf:
 457         kfree(isert_conn->login_rsp_buf);
 458 out_unmap_login_req_buf:
 459         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 460                             ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 461 out_free_login_req_buf:
 462         kfree(isert_conn->login_req_buf);
 463         return ret;
 464 }
 465
 466 static void
 467 isert_set_nego_params(struct isert_conn *isert_conn,
 468                       struct rdma_conn_param *param)
 469 {
 470         struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
 471
 472         /* Set max inflight RDMA READ requests */
 473         isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
 474                                 attr->max_qp_init_rd_atom);
 475         isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
 476
 477         if (param->private_data) {
 478                 u8 flags = *(u8 *)param->private_data;
 479
 480                 /*
 481                  * use remote invalidation if the both initiator
 482                  * and the HCA support it
 483                  */
 484                 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
 485                                           (attr->device_cap_flags &
 486                                            IB_DEVICE_MEM_MGT_EXTENSIONS);
 487                 if (isert_conn->snd_w_inv)
 488                         isert_info("Using remote invalidation\n");
 489         }
 490 }
 491
 492 static int
 493 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 494 {
 495         struct isert_np *isert_np = cma_id->context;
 496         struct iscsi_np *np = isert_np->np;
 497         struct isert_conn *isert_conn;
 498         struct isert_device *device;
 499         int ret = 0;
 500
 501         spin_lock_bh(&np->np_thread_lock);
 502         if (!np->enabled) {
 503                 spin_unlock_bh(&np->np_thread_lock);
 504                 isert_dbg("iscsi_np is not enabled, reject connect request\n");
 505                 return rdma_reject(cma_id, NULL, 0);
 506         }
 507         spin_unlock_bh(&np->np_thread_lock);
 508
 509         isert_dbg("cma_id: %p, portal: %p\n",
 510                  cma_id, cma_id->context);
 511
 512         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 513         if (!isert_conn)
 514                 return -ENOMEM;
 515
 516         isert_init_conn(isert_conn);
 517         isert_conn->cm_id = cma_id;
 518
 519         ret = isert_alloc_login_buf(isert_conn, cma_id->device);
 520         if (ret)
 521                 goto out;
 522
 523         device = isert_device_get(cma_id);
 524         if (IS_ERR(device)) {
 525                 ret = PTR_ERR(device);
 526                 goto out_rsp_dma_map;
 527         }
 528         isert_conn->device = device;
 529
 530         isert_set_nego_params(isert_conn, &event->param.conn);
 531
 532         ret = isert_conn_setup_qp(isert_conn, cma_id);
 533         if (ret)
 534                 goto out_conn_dev;
 535
 536         ret = isert_login_post_recv(isert_conn);
 537         if (ret)
 538                 goto out_conn_dev;
 539
 540         ret = isert_rdma_accept(isert_conn);
 541         if (ret)
 542                 goto out_conn_dev;
 543
 544         mutex_lock(&isert_np->mutex);
 545         list_add_tail(&isert_conn->node, &isert_np->accepted);
 546         mutex_unlock(&isert_np->mutex);
 547
 548         return 0;
 549
 550 out_conn_dev:
 551         isert_device_put(device);
 552 out_rsp_dma_map:
 553         isert_free_login_buf(isert_conn);
 554 out:
 555         kfree(isert_conn);
 556         rdma_reject(cma_id, NULL, 0);
 557         return ret;
 558 }
 559
 560 static void
 561 isert_connect_release(struct isert_conn *isert_conn)
 562 {
 563         struct isert_device *device = isert_conn->device;
 564
 565         isert_dbg("conn %p\n", isert_conn);
 566
 567         BUG_ON(!device);
 568
 569         isert_free_rx_descriptors(isert_conn);
 570         if (isert_conn->cm_id &&
 571             !isert_conn->dev_removed)
 572                 rdma_destroy_id(isert_conn->cm_id);
 573
 574         if (isert_conn->qp) {
 575                 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
 576
 577                 isert_comp_put(comp);
 578                 ib_destroy_qp(isert_conn->qp);
 579         }
 580
 581         if (isert_conn->login_req_buf)
 582                 isert_free_login_buf(isert_conn);
 583
 584         isert_device_put(device);
 585
 586         if (isert_conn->dev_removed)
 587                 wake_up_interruptible(&isert_conn->rem_wait);
 588         else
 589                 kfree(isert_conn);
 590 }
 591
 592 static void
 593 isert_connected_handler(struct rdma_cm_id *cma_id)
 594 {
 595         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 596         struct isert_np *isert_np = cma_id->context;
 597
 598         isert_info("conn %p\n", isert_conn);
 599
 600         mutex_lock(&isert_conn->mutex);
 601         isert_conn->state = ISER_CONN_UP;
 602         kref_get(&isert_conn->kref);
 603         mutex_unlock(&isert_conn->mutex);
 604
 605         mutex_lock(&isert_np->mutex);
 606         list_move_tail(&isert_conn->node, &isert_np->pending);
 607         mutex_unlock(&isert_np->mutex);
 608
 609         isert_info("np %p: Allow accept_np to continue\n", isert_np);
 610         up(&isert_np->sem);
 611 }
 612
 613 static void
 614 isert_release_kref(struct kref *kref)
 615 {
 616         struct isert_conn *isert_conn = container_of(kref,
 617                                 struct isert_conn, kref);
 618
 619         isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
 620                    current->pid);
 621
 622         isert_connect_release(isert_conn);
 623 }
 624
 625 static void
 626 isert_put_conn(struct isert_conn *isert_conn)
 627 {
 628         kref_put(&isert_conn->kref, isert_release_kref);
 629 }
 630
 631 static void
 632 isert_handle_unbound_conn(struct isert_conn *isert_conn)
 633 {
 634         struct isert_np *isert_np = isert_conn->cm_id->context;
 635
 636         mutex_lock(&isert_np->mutex);
 637         if (!list_empty(&isert_conn->node)) {
 638                 /*
 639                  * This means iscsi doesn't know this connection
 640                  * so schedule a cleanup ourselves
 641                  */
 642                 list_del_init(&isert_conn->node);
 643                 isert_put_conn(isert_conn);
 644                 queue_work(isert_release_wq, &isert_conn->release_work);
 645         }
 646         mutex_unlock(&isert_np->mutex);
 647 }
 648
 649 /**
 650  * isert_conn_terminate() - Initiate connection termination
 651  * @isert_conn: isert connection struct
 652  *
 653  * Notes:
 654  * In case the connection state is BOUND, move state
 655  * to TEMINATING and start teardown sequence (rdma_disconnect).
 656  * In case the connection state is UP, complete flush as well.
 657  *
 658  * This routine must be called with mutex held. Thus it is
 659  * safe to call multiple times.
 660  */
 661 static void
 662 isert_conn_terminate(struct isert_conn *isert_conn)
 663 {
 664         int err;
 665
 666         if (isert_conn->state >= ISER_CONN_TERMINATING)
 667                 return;
 668
 669         isert_info("Terminating conn %p state %d\n",
 670                    isert_conn, isert_conn->state);
 671         isert_conn->state = ISER_CONN_TERMINATING;
 672         err = rdma_disconnect(isert_conn->cm_id);
 673         if (err)
 674                 isert_warn("Failed rdma_disconnect isert_conn %p\n",
 675                            isert_conn);
 676 }
 677
 678 static int
 679 isert_np_cma_handler(struct isert_np *isert_np,
 680                      enum rdma_cm_event_type event)
 681 {
 682         isert_dbg("%s (%d): isert np %p\n",
 683                   rdma_event_msg(event), event, isert_np);
 684
 685         switch (event) {
 686         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 687                 isert_np->cm_id = NULL;
 688                 break;
 689         case RDMA_CM_EVENT_ADDR_CHANGE:
 690                 isert_np->cm_id = isert_setup_id(isert_np);
 691                 if (IS_ERR(isert_np->cm_id)) {
 692                         isert_err("isert np %p setup id failed: %ld\n",
 693                                   isert_np, PTR_ERR(isert_np->cm_id));
 694                         isert_np->cm_id = NULL;
 695                 }
 696                 break;
 697         default:
 698                 isert_err("isert np %p Unexpected event %d\n",
 699                           isert_np, event);
 700         }
 701
 702         return -1;
 703 }
 704
 705 static int
 706 isert_disconnected_handler(struct rdma_cm_id *cma_id,
 707                            enum rdma_cm_event_type event)
 708 {
 709         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 710
 711         mutex_lock(&isert_conn->mutex);
 712         switch (isert_conn->state) {
 713         case ISER_CONN_TERMINATING:
 714                 break;
 715         case ISER_CONN_UP:
 716                 isert_conn_terminate(isert_conn);
 717                 ib_drain_qp(isert_conn->qp);
 718                 isert_handle_unbound_conn(isert_conn);
 719                 break;
 720         case ISER_CONN_BOUND:
 721         case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
 722                 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
 723                 break;
 724         default:
 725                 isert_warn("conn %p terminating in state %d\n",
 726                            isert_conn, isert_conn->state);
 727         }
 728         mutex_unlock(&isert_conn->mutex);
 729
 730         return 0;
 731 }
 732
 733 static int
 734 isert_connect_error(struct rdma_cm_id *cma_id)
 735 {
 736         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 737
 738         ib_drain_qp(isert_conn->qp);
 739         list_del_init(&isert_conn->node);
 740         isert_conn->cm_id = NULL;
 741         isert_put_conn(isert_conn);
 742
 743         return -1;
 744 }
 745
 746 static int
 747 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 748 {
 749         struct isert_np *isert_np = cma_id->context;
 750         struct isert_conn *isert_conn;
 751         int ret = 0;
 752
 753         isert_info("%s (%d): status %d id %p np %p\n",
 754                    rdma_event_msg(event->event), event->event,
 755                    event->status, cma_id, cma_id->context);
 756
 757         if (isert_np->cm_id == cma_id)
 758                 return isert_np_cma_handler(cma_id->context, event->event);
 759
 760         switch (event->event) {
 761         case RDMA_CM_EVENT_CONNECT_REQUEST:
 762                 ret = isert_connect_request(cma_id, event);
 763                 if (ret)
 764                         isert_err("failed handle connect request %d\n", ret);
 765                 break;
 766         case RDMA_CM_EVENT_ESTABLISHED:
 767                 isert_connected_handler(cma_id);
 768                 break;
 769         case RDMA_CM_EVENT_ADDR_CHANGE:    /* FALLTHRU */
 770         case RDMA_CM_EVENT_DISCONNECTED:   /* FALLTHRU */
 771         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
 772                 ret = isert_disconnected_handler(cma_id, event->event);
 773                 break;
 774         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 775                 isert_conn = cma_id->qp->qp_context;
 776                 isert_conn->dev_removed = true;
 777                 isert_disconnected_handler(cma_id, event->event);
 778                 wait_event_interruptible(isert_conn->rem_wait,
 779                                          isert_conn->state == ISER_CONN_DOWN);
 780                 kfree(isert_conn);
 781                 /*
 782                  * return non-zero from the callback to destroy
 783                  * the rdma cm id
 784                  */
 785                 return 1;
 786         case RDMA_CM_EVENT_REJECTED:
 787                 isert_info("Connection rejected: %s\n",
 788                            rdma_reject_msg(cma_id, event->status));
 789                 /* fall through */
 790         case RDMA_CM_EVENT_UNREACHABLE:
 791         case RDMA_CM_EVENT_CONNECT_ERROR:
 792                 ret = isert_connect_error(cma_id);
 793                 break;
 794         default:
 795                 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
 796                 break;
 797         }
 798
 799         return ret;
 800 }
 801
 802 static int
 803 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
 804 {
 805         struct ib_recv_wr *rx_wr;
 806         int i, ret;
 807         struct iser_rx_desc *rx_desc;
 808
 809         for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
 810                 rx_desc = &isert_conn->rx_descs[i];
 811
 812                 rx_wr->wr_cqe = &rx_desc->rx_cqe;
 813                 rx_wr->sg_list = &rx_desc->rx_sg;
 814                 rx_wr->num_sge = 1;
 815                 rx_wr->next = rx_wr + 1;
 816                 rx_desc->in_use = false;
 817         }
 818         rx_wr--;
 819         rx_wr->next = NULL; /* mark end of work requests list */
 820
 821         ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr, NULL);
 822         if (ret)
 823                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 824
 825         return ret;
 826 }
 827
 828 static int
 829 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
 830 {
 831         struct ib_recv_wr rx_wr;
 832         int ret;
 833
 834         if (!rx_desc->in_use) {
 835                 /*
 836                  * if the descriptor is not in-use we already reposted it
 837                  * for recv, so just silently return
 838                  */
 839                 return 0;
 840         }
 841
 842         rx_desc->in_use = false;
 843         rx_wr.wr_cqe = &rx_desc->rx_cqe;
 844         rx_wr.sg_list = &rx_desc->rx_sg;
 845         rx_wr.num_sge = 1;
 846         rx_wr.next = NULL;
 847
 848         ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL);
 849         if (ret)
 850                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 851
 852         return ret;
 853 }
 854
 855 static int
 856 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 857 {
 858         struct ib_device *ib_dev = isert_conn->cm_id->device;
 859         struct ib_send_wr send_wr;
 860         int ret;
 861
 862         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 863                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 864
 865         tx_desc->tx_cqe.done = isert_login_send_done;
 866
 867         send_wr.next    = NULL;
 868         send_wr.wr_cqe  = &tx_desc->tx_cqe;
 869         send_wr.sg_list = tx_desc->tx_sg;
 870         send_wr.num_sge = tx_desc->num_sge;
 871         send_wr.opcode  = IB_WR_SEND;
 872         send_wr.send_flags = IB_SEND_SIGNALED;
 873
 874         ret = ib_post_send(isert_conn->qp, &send_wr, NULL);
 875         if (ret)
 876                 isert_err("ib_post_send() failed, ret: %d\n", ret);
 877
 878         return ret;
 879 }
 880
 881 static void
 882 __isert_create_send_desc(struct isert_device *device,
 883                          struct iser_tx_desc *tx_desc)
 884 {
 885
 886         memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
 887         tx_desc->iser_header.flags = ISCSI_CTRL;
 888
 889         tx_desc->num_sge = 1;
 890
 891         if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
 892                 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
 893                 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 894         }
 895 }
 896
 897 static void
 898 isert_create_send_desc(struct isert_conn *isert_conn,
 899                        struct isert_cmd *isert_cmd,
 900                        struct iser_tx_desc *tx_desc)
 901 {
 902         struct isert_device *device = isert_conn->device;
 903         struct ib_device *ib_dev = device->ib_device;
 904
 905         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 906                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 907
 908         __isert_create_send_desc(device, tx_desc);
 909 }
 910
 911 static int
 912 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 913                    struct iser_tx_desc *tx_desc)
 914 {
 915         struct isert_device *device = isert_conn->device;
 916         struct ib_device *ib_dev = device->ib_device;
 917         u64 dma_addr;
 918
 919         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 920                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 921         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 922                 isert_err("ib_dma_mapping_error() failed\n");
 923                 return -ENOMEM;
 924         }
 925
 926         tx_desc->dma_addr = dma_addr;
 927         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 928         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 929         tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
 930
 931         isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
 932                   tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
 933                   tx_desc->tx_sg[0].lkey);
 934
 935         return 0;
 936 }
 937
 938 static void
 939 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 940                    struct ib_send_wr *send_wr)
 941 {
 942         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 943
 944         tx_desc->tx_cqe.done = isert_send_done;
 945         send_wr->wr_cqe = &tx_desc->tx_cqe;
 946
 947         if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
 948                 send_wr->opcode  = IB_WR_SEND_WITH_INV;
 949                 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
 950         } else {
 951                 send_wr->opcode = IB_WR_SEND;
 952         }
 953
 954         send_wr->sg_list = &tx_desc->tx_sg[0];
 955         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 956         send_wr->send_flags = IB_SEND_SIGNALED;
 957 }
 958
 959 static int
 960 isert_login_post_recv(struct isert_conn *isert_conn)
 961 {
 962         struct ib_recv_wr rx_wr;
 963         struct ib_sge sge;
 964         int ret;
 965
 966         memset(&sge, 0, sizeof(struct ib_sge));
 967         sge.addr = isert_conn->login_req_dma;
 968         sge.length = ISER_RX_PAYLOAD_SIZE;
 969         sge.lkey = isert_conn->device->pd->local_dma_lkey;
 970
 971         isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
 972                 sge.addr, sge.length, sge.lkey);
 973
 974         isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
 975
 976         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
 977         rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
 978         rx_wr.sg_list = &sge;
 979         rx_wr.num_sge = 1;
 980
 981         ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL);
 982         if (ret)
 983                 isert_err("ib_post_recv() failed: %d\n", ret);
 984
 985         return ret;
 986 }
 987
 988 static int
 989 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
 990                    u32 length)
 991 {
 992         struct isert_conn *isert_conn = conn->context;
 993         struct isert_device *device = isert_conn->device;
 994         struct ib_device *ib_dev = device->ib_device;
 995         struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
 996         int ret;
 997
 998         __isert_create_send_desc(device, tx_desc);
 999
1000         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1001                sizeof(struct iscsi_hdr));
1002
1003         isert_init_tx_hdrs(isert_conn, tx_desc);
1004
1005         if (length > 0) {
1006                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1007
1008                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1009                                            length, DMA_TO_DEVICE);
1010
1011                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1012
1013                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1014                                               length, DMA_TO_DEVICE);
1015
1016                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1017                 tx_dsg->length  = length;
1018                 tx_dsg->lkey    = isert_conn->device->pd->local_dma_lkey;
1019                 tx_desc->num_sge = 2;
1020         }
1021         if (!login->login_failed) {
1022                 if (login->login_complete) {
1023                         ret = isert_alloc_rx_descriptors(isert_conn);
1024                         if (ret)
1025                                 return ret;
1026
1027                         ret = isert_post_recvm(isert_conn,
1028                                                ISERT_QP_MAX_RECV_DTOS);
1029                         if (ret)
1030                                 return ret;
1031
1032                         /* Now we are in FULL_FEATURE phase */
1033                         mutex_lock(&isert_conn->mutex);
1034                         isert_conn->state = ISER_CONN_FULL_FEATURE;
1035                         mutex_unlock(&isert_conn->mutex);
1036                         goto post_send;
1037                 }
1038
1039                 ret = isert_login_post_recv(isert_conn);
1040                 if (ret)
1041                         return ret;
1042         }
1043 post_send:
1044         ret = isert_login_post_send(isert_conn, tx_desc);
1045         if (ret)
1046                 return ret;
1047
1048         return 0;
1049 }
1050
1051 static void
1052 isert_rx_login_req(struct isert_conn *isert_conn)
1053 {
1054         struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1055         int rx_buflen = isert_conn->login_req_len;
1056         struct iscsi_conn *conn = isert_conn->conn;
1057         struct iscsi_login *login = conn->conn_login;
1058         int size;
1059
1060         isert_info("conn %p\n", isert_conn);
1061
1062         WARN_ON_ONCE(!login);
1063
1064         if (login->first_request) {
1065                 struct iscsi_login_req *login_req =
1066                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1067                 /*
1068                  * Setup the initial iscsi_login values from the leading
1069                  * login request PDU.
1070                  */
1071                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1072                 login->current_stage =
1073                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1074                          >> 2;
1075                 login->version_min      = login_req->min_version;
1076                 login->version_max      = login_req->max_version;
1077                 memcpy(login->isid, login_req->isid, 6);
1078                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1079                 login->init_task_tag    = login_req->itt;
1080                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1081                 login->cid              = be16_to_cpu(login_req->cid);
1082                 login->tsih             = be16_to_cpu(login_req->tsih);
1083         }
1084
1085         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1086
1087         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1088         isert_dbg("Using login payload size: %d, rx_buflen: %d "
1089                   "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1090                   MAX_KEY_VALUE_PAIRS);
1091         memcpy(login->req_buf, &rx_desc->data[0], size);
1092
1093         if (login->first_request) {
1094                 complete(&isert_conn->login_comp);
1095                 return;
1096         }
1097         schedule_delayed_work(&conn->login_work, 0);
1098 }
1099
1100 static struct iscsi_cmd
1101 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1102 {
1103         struct isert_conn *isert_conn = conn->context;
1104         struct isert_cmd *isert_cmd;
1105         struct iscsi_cmd *cmd;
1106
1107         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1108         if (!cmd) {
1109                 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1110                 return NULL;
1111         }
1112         isert_cmd = iscsit_priv_cmd(cmd);
1113         isert_cmd->conn = isert_conn;
1114         isert_cmd->iscsi_cmd = cmd;
1115         isert_cmd->rx_desc = rx_desc;
1116
1117         return cmd;
1118 }
1119
1120 static int
1121 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1122                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1123                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1124 {
1125         struct iscsi_conn *conn = isert_conn->conn;
1126         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1127         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1128         bool dump_payload = false;
1129         unsigned int data_len;
1130
1131         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1132         if (rc < 0)
1133                 return rc;
1134
1135         imm_data = cmd->immediate_data;
1136         imm_data_len = cmd->first_burst_len;
1137         unsol_data = cmd->unsolicited_data;
1138         data_len = cmd->se_cmd.data_length;
1139
1140         if (imm_data && imm_data_len == data_len)
1141                 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1142         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1143         if (rc < 0) {
1144                 return 0;
1145         } else if (rc > 0) {
1146                 dump_payload = true;
1147                 goto sequence_cmd;
1148         }
1149
1150         if (!imm_data)
1151                 return 0;
1152
1153         if (imm_data_len != data_len) {
1154                 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1155                 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1156                                     &rx_desc->data[0], imm_data_len);
1157                 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1158                           sg_nents, imm_data_len);
1159         } else {
1160                 sg_init_table(&isert_cmd->sg, 1);
1161                 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1162                 cmd->se_cmd.t_data_nents = 1;
1163                 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1164                 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1165                           imm_data_len);
1166         }
1167
1168         cmd->write_data_done += imm_data_len;
1169
1170         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1171                 spin_lock_bh(&cmd->istate_lock);
1172                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1173                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1174                 spin_unlock_bh(&cmd->istate_lock);
1175         }
1176
1177 sequence_cmd:
1178         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1179
1180         if (!rc && dump_payload == false && unsol_data)
1181                 iscsit_set_unsolicited_dataout(cmd);
1182         else if (dump_payload && imm_data)
1183                 target_put_sess_cmd(&cmd->se_cmd);
1184
1185         return 0;
1186 }
1187
1188 static int
1189 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1190                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1191 {
1192         struct scatterlist *sg_start;
1193         struct iscsi_conn *conn = isert_conn->conn;
1194         struct iscsi_cmd *cmd = NULL;
1195         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1196         u32 unsol_data_len = ntoh24(hdr->dlength);
1197         int rc, sg_nents, sg_off, page_off;
1198
1199         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1200         if (rc < 0)
1201                 return rc;
1202         else if (!cmd)
1203                 return 0;
1204         /*
1205          * FIXME: Unexpected unsolicited_data out
1206          */
1207         if (!cmd->unsolicited_data) {
1208                 isert_err("Received unexpected solicited data payload\n");
1209                 dump_stack();
1210                 return -1;
1211         }
1212
1213         isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1214                   "write_data_done: %u, data_length: %u\n",
1215                   unsol_data_len,  cmd->write_data_done,
1216                   cmd->se_cmd.data_length);
1217
1218         sg_off = cmd->write_data_done / PAGE_SIZE;
1219         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1220         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1221         page_off = cmd->write_data_done % PAGE_SIZE;
1222         /*
1223          * FIXME: Non page-aligned unsolicited_data out
1224          */
1225         if (page_off) {
1226                 isert_err("unexpected non-page aligned data payload\n");
1227                 dump_stack();
1228                 return -1;
1229         }
1230         isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1231                   "sg_nents: %u from %p %u\n", sg_start, sg_off,
1232                   sg_nents, &rx_desc->data[0], unsol_data_len);
1233
1234         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1235                             unsol_data_len);
1236
1237         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1238         if (rc < 0)
1239                 return rc;
1240
1241         /*
1242          * multiple data-outs on the same command can arrive -
1243          * so post the buffer before hand
1244          */
1245         rc = isert_post_recv(isert_conn, rx_desc);
1246         if (rc) {
1247                 isert_err("ib_post_recv failed with %d\n", rc);
1248                 return rc;
1249         }
1250         return 0;
1251 }
1252
1253 static int
1254 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1255                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1256                      unsigned char *buf)
1257 {
1258         struct iscsi_conn *conn = isert_conn->conn;
1259         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1260         int rc;
1261
1262         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1263         if (rc < 0)
1264                 return rc;
1265         /*
1266          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1267          */
1268
1269         return iscsit_process_nop_out(conn, cmd, hdr);
1270 }
1271
1272 static int
1273 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1274                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1275                       struct iscsi_text *hdr)
1276 {
1277         struct iscsi_conn *conn = isert_conn->conn;
1278         u32 payload_length = ntoh24(hdr->dlength);
1279         int rc;
1280         unsigned char *text_in = NULL;
1281
1282         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1283         if (rc < 0)
1284                 return rc;
1285
1286         if (payload_length) {
1287                 text_in = kzalloc(payload_length, GFP_KERNEL);
1288                 if (!text_in)
1289                         return -ENOMEM;
1290         }
1291         cmd->text_in_ptr = text_in;
1292
1293         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1294
1295         return iscsit_process_text_cmd(conn, cmd, hdr);
1296 }
1297
1298 static int
1299 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1300                 uint32_t read_stag, uint64_t read_va,
1301                 uint32_t write_stag, uint64_t write_va)
1302 {
1303         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1304         struct iscsi_conn *conn = isert_conn->conn;
1305         struct iscsi_cmd *cmd;
1306         struct isert_cmd *isert_cmd;
1307         int ret = -EINVAL;
1308         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1309
1310         if (conn->sess->sess_ops->SessionType &&
1311            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1312                 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1313                           " ignoring\n", opcode);
1314                 return 0;
1315         }
1316
1317         switch (opcode) {
1318         case ISCSI_OP_SCSI_CMD:
1319                 cmd = isert_allocate_cmd(conn, rx_desc);
1320                 if (!cmd)
1321                         break;
1322
1323                 isert_cmd = iscsit_priv_cmd(cmd);
1324                 isert_cmd->read_stag = read_stag;
1325                 isert_cmd->read_va = read_va;
1326                 isert_cmd->write_stag = write_stag;
1327                 isert_cmd->write_va = write_va;
1328                 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1329
1330                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1331                                         rx_desc, (unsigned char *)hdr);
1332                 break;
1333         case ISCSI_OP_NOOP_OUT:
1334                 cmd = isert_allocate_cmd(conn, rx_desc);
1335                 if (!cmd)
1336                         break;
1337
1338                 isert_cmd = iscsit_priv_cmd(cmd);
1339                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1340                                            rx_desc, (unsigned char *)hdr);
1341                 break;
1342         case ISCSI_OP_SCSI_DATA_OUT:
1343                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1344                                                 (unsigned char *)hdr);
1345                 break;
1346         case ISCSI_OP_SCSI_TMFUNC:
1347                 cmd = isert_allocate_cmd(conn, rx_desc);
1348                 if (!cmd)
1349                         break;
1350
1351                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1352                                                 (unsigned char *)hdr);
1353                 break;
1354         case ISCSI_OP_LOGOUT:
1355                 cmd = isert_allocate_cmd(conn, rx_desc);
1356                 if (!cmd)
1357                         break;
1358
1359                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1360                 break;
1361         case ISCSI_OP_TEXT:
1362                 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1363                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1364                 else
1365                         cmd = isert_allocate_cmd(conn, rx_desc);
1366
1367                 if (!cmd)
1368                         break;
1369
1370                 isert_cmd = iscsit_priv_cmd(cmd);
1371                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1372                                             rx_desc, (struct iscsi_text *)hdr);
1373                 break;
1374         default:
1375                 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1376                 dump_stack();
1377                 break;
1378         }
1379
1380         return ret;
1381 }
1382
1383 static void
1384 isert_print_wc(struct ib_wc *wc, const char *type)
1385 {
1386         if (wc->status != IB_WC_WR_FLUSH_ERR)
1387                 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1388                           ib_wc_status_msg(wc->status), wc->status,
1389                           wc->vendor_err);
1390         else
1391                 isert_dbg("%s failure: %s (%d)\n", type,
1392                           ib_wc_status_msg(wc->status), wc->status);
1393 }
1394
1395 static void
1396 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1397 {
1398         struct isert_conn *isert_conn = wc->qp->qp_context;
1399         struct ib_device *ib_dev = isert_conn->cm_id->device;
1400         struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1401         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1402         struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1403         uint64_t read_va = 0, write_va = 0;
1404         uint32_t read_stag = 0, write_stag = 0;
1405
1406         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1407                 isert_print_wc(wc, "recv");
1408                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1409                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1410                 return;
1411         }
1412
1413         rx_desc->in_use = true;
1414
1415         ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1416                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1417
1418         isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1419                  rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1420                  (int)(wc->byte_len - ISER_HEADERS_LEN));
1421
1422         switch (iser_ctrl->flags & 0xF0) {
1423         case ISCSI_CTRL:
1424                 if (iser_ctrl->flags & ISER_RSV) {
1425                         read_stag = be32_to_cpu(iser_ctrl->read_stag);
1426                         read_va = be64_to_cpu(iser_ctrl->read_va);
1427                         isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1428                                   read_stag, (unsigned long long)read_va);
1429                 }
1430                 if (iser_ctrl->flags & ISER_WSV) {
1431                         write_stag = be32_to_cpu(iser_ctrl->write_stag);
1432                         write_va = be64_to_cpu(iser_ctrl->write_va);
1433                         isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1434                                   write_stag, (unsigned long long)write_va);
1435                 }
1436
1437                 isert_dbg("ISER ISCSI_CTRL PDU\n");
1438                 break;
1439         case ISER_HELLO:
1440                 isert_err("iSER Hello message\n");
1441                 break;
1442         default:
1443                 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1444                 break;
1445         }
1446
1447         isert_rx_opcode(isert_conn, rx_desc,
1448                         read_stag, read_va, write_stag, write_va);
1449
1450         ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1451                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1452 }
1453
1454 static void
1455 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1456 {
1457         struct isert_conn *isert_conn = wc->qp->qp_context;
1458         struct ib_device *ib_dev = isert_conn->device->ib_device;
1459
1460         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1461                 isert_print_wc(wc, "login recv");
1462                 return;
1463         }
1464
1465         ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1466                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1467
1468         isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1469
1470         if (isert_conn->conn) {
1471                 struct iscsi_login *login = isert_conn->conn->conn_login;
1472
1473                 if (login && !login->first_request)
1474                         isert_rx_login_req(isert_conn);
1475         }
1476
1477         mutex_lock(&isert_conn->mutex);
1478         complete(&isert_conn->login_req_comp);
1479         mutex_unlock(&isert_conn->mutex);
1480
1481         ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1482                                 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1483 }
1484
1485 static void
1486 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1487 {
1488         struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
1489         enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1490
1491         if (!cmd->rw.nr_ops)
1492                 return;
1493
1494         if (isert_prot_cmd(conn, se_cmd)) {
1495                 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1496                                 conn->cm_id->port_num, se_cmd->t_data_sg,
1497                                 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1498                                 se_cmd->t_prot_nents, dir);
1499         } else {
1500                 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1501                                 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1502         }
1503
1504         cmd->rw.nr_ops = 0;
1505 }
1506
1507 static void
1508 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1509 {
1510         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1511         struct isert_conn *isert_conn = isert_cmd->conn;
1512         struct iscsi_conn *conn = isert_conn->conn;
1513         struct iscsi_text_rsp *hdr;
1514
1515         isert_dbg("Cmd %p\n", isert_cmd);
1516
1517         switch (cmd->iscsi_opcode) {
1518         case ISCSI_OP_SCSI_CMD:
1519                 spin_lock_bh(&conn->cmd_lock);
1520                 if (!list_empty(&cmd->i_conn_node))
1521                         list_del_init(&cmd->i_conn_node);
1522                 spin_unlock_bh(&conn->cmd_lock);
1523
1524                 if (cmd->data_direction == DMA_TO_DEVICE) {
1525                         iscsit_stop_dataout_timer(cmd);
1526                         /*
1527                          * Check for special case during comp_err where
1528                          * WRITE_PENDING has been handed off from core,
1529                          * but requires an extra target_put_sess_cmd()
1530                          * before transport_generic_free_cmd() below.
1531                          */
1532                         if (comp_err &&
1533                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1534                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1535
1536                                 target_put_sess_cmd(se_cmd);
1537                         }
1538                 }
1539
1540                 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1541                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1542                 break;
1543         case ISCSI_OP_SCSI_TMFUNC:
1544                 spin_lock_bh(&conn->cmd_lock);
1545                 if (!list_empty(&cmd->i_conn_node))
1546                         list_del_init(&cmd->i_conn_node);
1547                 spin_unlock_bh(&conn->cmd_lock);
1548
1549                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1550                 break;
1551         case ISCSI_OP_REJECT:
1552         case ISCSI_OP_NOOP_OUT:
1553         case ISCSI_OP_TEXT:
1554                 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1555                 /* If the continue bit is on, keep the command alive */
1556                 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1557                         break;
1558
1559                 spin_lock_bh(&conn->cmd_lock);
1560                 if (!list_empty(&cmd->i_conn_node))
1561                         list_del_init(&cmd->i_conn_node);
1562                 spin_unlock_bh(&conn->cmd_lock);
1563
1564                 /*
1565                  * Handle special case for REJECT when iscsi_add_reject*() has
1566                  * overwritten the original iscsi_opcode assignment, and the
1567                  * associated cmd->se_cmd needs to be released.
1568                  */
1569                 if (cmd->se_cmd.se_tfo != NULL) {
1570                         isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1571                                  cmd->iscsi_opcode);
1572                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1573                         break;
1574                 }
1575                 /* fall through */
1576         default:
1577                 iscsit_release_cmd(cmd);
1578                 break;
1579         }
1580 }
1581
1582 static void
1583 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1584 {
1585         if (tx_desc->dma_addr != 0) {
1586                 isert_dbg("unmap single for tx_desc->dma_addr\n");
1587                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1588                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1589                 tx_desc->dma_addr = 0;
1590         }
1591 }
1592
1593 static void
1594 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1595                      struct ib_device *ib_dev, bool comp_err)
1596 {
1597         if (isert_cmd->pdu_buf_dma != 0) {
1598                 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1599                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1600                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1601                 isert_cmd->pdu_buf_dma = 0;
1602         }
1603
1604         isert_unmap_tx_desc(tx_desc, ib_dev);
1605         isert_put_cmd(isert_cmd, comp_err);
1606 }
1607
1608 static int
1609 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1610 {
1611         struct ib_mr_status mr_status;
1612         int ret;
1613
1614         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1615         if (ret) {
1616                 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1617                 goto fail_mr_status;
1618         }
1619
1620         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1621                 u64 sec_offset_err;
1622                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1623
1624                 switch (mr_status.sig_err.err_type) {
1625                 case IB_SIG_BAD_GUARD:
1626                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1627                         break;
1628                 case IB_SIG_BAD_REFTAG:
1629                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1630                         break;
1631                 case IB_SIG_BAD_APPTAG:
1632                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1633                         break;
1634                 }
1635                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1636                 do_div(sec_offset_err, block_size);
1637                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1638
1639                 isert_err("PI error found type %d at sector 0x%llx "
1640                           "expected 0x%x vs actual 0x%x\n",
1641                           mr_status.sig_err.err_type,
1642                           (unsigned long long)se_cmd->bad_sector,
1643                           mr_status.sig_err.expected,
1644                           mr_status.sig_err.actual);
1645                 ret = 1;
1646         }
1647
1648 fail_mr_status:
1649         return ret;
1650 }
1651
1652 static void
1653 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1654 {
1655         struct isert_conn *isert_conn = wc->qp->qp_context;
1656         struct isert_device *device = isert_conn->device;
1657         struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1658         struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1659         struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1660         int ret = 0;
1661
1662         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1663                 isert_print_wc(wc, "rdma write");
1664                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1665                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1666                 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1667                 return;
1668         }
1669
1670         isert_dbg("Cmd %p\n", isert_cmd);
1671
1672         ret = isert_check_pi_status(cmd, isert_cmd->rw.reg->mr);
1673         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1674
1675         if (ret) {
1676                 /*
1677                  * transport_generic_request_failure() expects to have
1678                  * plus two references to handle queue-full, so re-add
1679                  * one here as target-core will have already dropped
1680                  * it after the first isert_put_datain() callback.
1681                  */
1682                 kref_get(&cmd->cmd_kref);
1683                 transport_generic_request_failure(cmd, cmd->pi_err);
1684         } else {
1685                 /*
1686                  * XXX: isert_put_response() failure is not retried.
1687                  */
1688                 ret = isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1689                 if (ret)
1690                         pr_warn_ratelimited("isert_put_response() ret: %d\n", ret);
1691         }
1692 }
1693
1694 static void
1695 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1696 {
1697         struct isert_conn *isert_conn = wc->qp->qp_context;
1698         struct isert_device *device = isert_conn->device;
1699         struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1700         struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1701         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1702         struct se_cmd *se_cmd = &cmd->se_cmd;
1703         int ret = 0;
1704
1705         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1706                 isert_print_wc(wc, "rdma read");
1707                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1708                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1709                 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1710                 return;
1711         }
1712
1713         isert_dbg("Cmd %p\n", isert_cmd);
1714
1715         iscsit_stop_dataout_timer(cmd);
1716
1717         if (isert_prot_cmd(isert_conn, se_cmd))
1718                 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.reg->mr);
1719         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1720         cmd->write_data_done = 0;
1721
1722         isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1723         spin_lock_bh(&cmd->istate_lock);
1724         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1725         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1726         spin_unlock_bh(&cmd->istate_lock);
1727
1728         /*
1729          * transport_generic_request_failure() will drop the extra
1730          * se_cmd->cmd_kref reference after T10-PI error, and handle
1731          * any non-zero ->queue_status() callback error retries.
1732          */
1733         if (ret)
1734                 transport_generic_request_failure(se_cmd, se_cmd->pi_err);
1735         else
1736                 target_execute_cmd(se_cmd);
1737 }
1738
1739 static void
1740 isert_do_control_comp(struct work_struct *work)
1741 {
1742         struct isert_cmd *isert_cmd = container_of(work,
1743                         struct isert_cmd, comp_work);
1744         struct isert_conn *isert_conn = isert_cmd->conn;
1745         struct ib_device *ib_dev = isert_conn->cm_id->device;
1746         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1747
1748         isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1749
1750         switch (cmd->i_state) {
1751         case ISTATE_SEND_TASKMGTRSP:
1752                 iscsit_tmr_post_handler(cmd, cmd->conn);
1753                 /* fall through */
1754         case ISTATE_SEND_REJECT:
1755         case ISTATE_SEND_TEXTRSP:
1756                 cmd->i_state = ISTATE_SENT_STATUS;
1757                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1758                                      ib_dev, false);
1759                 break;
1760         case ISTATE_SEND_LOGOUTRSP:
1761                 iscsit_logout_post_handler(cmd, cmd->conn);
1762                 break;
1763         default:
1764                 isert_err("Unknown i_state %d\n", cmd->i_state);
1765                 dump_stack();
1766                 break;
1767         }
1768 }
1769
1770 static void
1771 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1772 {
1773         struct isert_conn *isert_conn = wc->qp->qp_context;
1774         struct ib_device *ib_dev = isert_conn->cm_id->device;
1775         struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1776
1777         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1778                 isert_print_wc(wc, "login send");
1779                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1780                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1781         }
1782
1783         isert_unmap_tx_desc(tx_desc, ib_dev);
1784 }
1785
1786 static void
1787 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1788 {
1789         struct isert_conn *isert_conn = wc->qp->qp_context;
1790         struct ib_device *ib_dev = isert_conn->cm_id->device;
1791         struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1792         struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1793
1794         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1795                 isert_print_wc(wc, "send");
1796                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1797                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1798                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1799                 return;
1800         }
1801
1802         isert_dbg("Cmd %p\n", isert_cmd);
1803
1804         switch (isert_cmd->iscsi_cmd->i_state) {
1805         case ISTATE_SEND_TASKMGTRSP:
1806         case ISTATE_SEND_LOGOUTRSP:
1807         case ISTATE_SEND_REJECT:
1808         case ISTATE_SEND_TEXTRSP:
1809                 isert_unmap_tx_desc(tx_desc, ib_dev);
1810
1811                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1812                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1813                 return;
1814         default:
1815                 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
1816                 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1817                 break;
1818         }
1819 }
1820
1821 static int
1822 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1823 {
1824         int ret;
1825
1826         ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1827         if (ret) {
1828                 isert_err("ib_post_recv failed with %d\n", ret);
1829                 return ret;
1830         }
1831
1832         ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr, NULL);
1833         if (ret) {
1834                 isert_err("ib_post_send failed with %d\n", ret);
1835                 return ret;
1836         }
1837         return ret;
1838 }
1839
1840 static int
1841 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1842 {
1843         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1844         struct isert_conn *isert_conn = conn->context;
1845         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1846         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1847                                 &isert_cmd->tx_desc.iscsi_header;
1848
1849         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1850         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1851         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1852         /*
1853          * Attach SENSE DATA payload to iSCSI Response PDU
1854          */
1855         if (cmd->se_cmd.sense_buffer &&
1856             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1857             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1858                 struct isert_device *device = isert_conn->device;
1859                 struct ib_device *ib_dev = device->ib_device;
1860                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1861                 u32 padding, pdu_len;
1862
1863                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1864                                    cmd->sense_buffer);
1865                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1866
1867                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1868                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1869                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1870
1871                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1872                                 (void *)cmd->sense_buffer, pdu_len,
1873                                 DMA_TO_DEVICE);
1874                 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1875                         return -ENOMEM;
1876
1877                 isert_cmd->pdu_buf_len = pdu_len;
1878                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1879                 tx_dsg->length  = pdu_len;
1880                 tx_dsg->lkey    = device->pd->local_dma_lkey;
1881                 isert_cmd->tx_desc.num_sge = 2;
1882         }
1883
1884         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1885
1886         isert_dbg("Posting SCSI Response\n");
1887
1888         return isert_post_response(isert_conn, isert_cmd);
1889 }
1890
1891 static void
1892 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1893 {
1894         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1895         struct isert_conn *isert_conn = conn->context;
1896
1897         spin_lock_bh(&conn->cmd_lock);
1898         if (!list_empty(&cmd->i_conn_node))
1899                 list_del_init(&cmd->i_conn_node);
1900         spin_unlock_bh(&conn->cmd_lock);
1901
1902         if (cmd->data_direction == DMA_TO_DEVICE)
1903                 iscsit_stop_dataout_timer(cmd);
1904         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1905 }
1906
1907 static enum target_prot_op
1908 isert_get_sup_prot_ops(struct iscsi_conn *conn)
1909 {
1910         struct isert_conn *isert_conn = conn->context;
1911         struct isert_device *device = isert_conn->device;
1912
1913         if (conn->tpg->tpg_attrib.t10_pi) {
1914                 if (device->pi_capable) {
1915                         isert_info("conn %p PI offload enabled\n", isert_conn);
1916                         isert_conn->pi_support = true;
1917                         return TARGET_PROT_ALL;
1918                 }
1919         }
1920
1921         isert_info("conn %p PI offload disabled\n", isert_conn);
1922         isert_conn->pi_support = false;
1923
1924         return TARGET_PROT_NORMAL;
1925 }
1926
1927 static int
1928 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1929                 bool nopout_response)
1930 {
1931         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1932         struct isert_conn *isert_conn = conn->context;
1933         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1934
1935         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1936         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1937                                &isert_cmd->tx_desc.iscsi_header,
1938                                nopout_response);
1939         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1940         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1941
1942         isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1943
1944         return isert_post_response(isert_conn, isert_cmd);
1945 }
1946
1947 static int
1948 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1949 {
1950         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1951         struct isert_conn *isert_conn = conn->context;
1952         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1953
1954         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1955         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1956                                 &isert_cmd->tx_desc.iscsi_header);
1957         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1958         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1959
1960         isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1961
1962         return isert_post_response(isert_conn, isert_cmd);
1963 }
1964
1965 static int
1966 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1967 {
1968         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1969         struct isert_conn *isert_conn = conn->context;
1970         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1971
1972         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1973         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1974                                   &isert_cmd->tx_desc.iscsi_header);
1975         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1976         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1977
1978         isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1979
1980         return isert_post_response(isert_conn, isert_cmd);
1981 }
1982
1983 static int
1984 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1985 {
1986         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1987         struct isert_conn *isert_conn = conn->context;
1988         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1989         struct isert_device *device = isert_conn->device;
1990         struct ib_device *ib_dev = device->ib_device;
1991         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1992         struct iscsi_reject *hdr =
1993                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1994
1995         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1996         iscsit_build_reject(cmd, conn, hdr);
1997         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1998
1999         hton24(hdr->dlength, ISCSI_HDR_LEN);
2000         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2001                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2002                         DMA_TO_DEVICE);
2003         if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
2004                 return -ENOMEM;
2005         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2006         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2007         tx_dsg->length  = ISCSI_HDR_LEN;
2008         tx_dsg->lkey    = device->pd->local_dma_lkey;
2009         isert_cmd->tx_desc.num_sge = 2;
2010
2011         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2012
2013         isert_dbg("conn %p Posting Reject\n", isert_conn);
2014
2015         return isert_post_response(isert_conn, isert_cmd);
2016 }
2017
2018 static int
2019 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2020 {
2021         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2022         struct isert_conn *isert_conn = conn->context;
2023         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2024         struct iscsi_text_rsp *hdr =
2025                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2026         u32 txt_rsp_len;
2027         int rc;
2028
2029         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2030         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2031         if (rc < 0)
2032                 return rc;
2033
2034         txt_rsp_len = rc;
2035         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2036
2037         if (txt_rsp_len) {
2038                 struct isert_device *device = isert_conn->device;
2039                 struct ib_device *ib_dev = device->ib_device;
2040                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2041                 void *txt_rsp_buf = cmd->buf_ptr;
2042
2043                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2044                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2045                 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
2046                         return -ENOMEM;
2047
2048                 isert_cmd->pdu_buf_len = txt_rsp_len;
2049                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2050                 tx_dsg->length  = txt_rsp_len;
2051                 tx_dsg->lkey    = device->pd->local_dma_lkey;
2052                 isert_cmd->tx_desc.num_sge = 2;
2053         }
2054         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2055
2056         isert_dbg("conn %p Text Response\n", isert_conn);
2057
2058         return isert_post_response(isert_conn, isert_cmd);
2059 }
2060
2061 static inline void
2062 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_domain *domain)
2063 {
2064         domain->sig_type = IB_SIG_TYPE_T10_DIF;
2065         domain->sig.dif.bg_type = IB_T10DIF_CRC;
2066         domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2067         domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2068         /*
2069          * At the moment we hard code those, but if in the future
2070          * the target core would like to use it, we will take it
2071          * from se_cmd.
2072          */
2073         domain->sig.dif.apptag_check_mask = 0xffff;
2074         domain->sig.dif.app_escape = true;
2075         domain->sig.dif.ref_escape = true;
2076         if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2077             se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2078                 domain->sig.dif.ref_remap = true;
2079 };
2080
2081 static int
2082 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2083 {
2084         memset(sig_attrs, 0, sizeof(*sig_attrs));
2085
2086         switch (se_cmd->prot_op) {
2087         case TARGET_PROT_DIN_INSERT:
2088         case TARGET_PROT_DOUT_STRIP:
2089                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2090                 isert_set_dif_domain(se_cmd, &sig_attrs->wire);
2091                 break;
2092         case TARGET_PROT_DOUT_INSERT:
2093         case TARGET_PROT_DIN_STRIP:
2094                 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2095                 isert_set_dif_domain(se_cmd, &sig_attrs->mem);
2096                 break;
2097         case TARGET_PROT_DIN_PASS:
2098         case TARGET_PROT_DOUT_PASS:
2099                 isert_set_dif_domain(se_cmd, &sig_attrs->wire);
2100                 isert_set_dif_domain(se_cmd, &sig_attrs->mem);
2101                 break;
2102         default:
2103                 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2104                 return -EINVAL;
2105         }
2106
2107         if (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD)
2108                 sig_attrs->check_mask |= IB_SIG_CHECK_GUARD;
2109         if (se_cmd->prot_checks & TARGET_DIF_CHECK_APPTAG)
2110                 sig_attrs->check_mask |= IB_SIG_CHECK_APPTAG;
2111         if (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)
2112                 sig_attrs->check_mask |= IB_SIG_CHECK_REFTAG;
2113
2114         return 0;
2115 }
2116
2117 static int
2118 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2119                 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2120 {
2121         struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
2122         enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2123         u8 port_num = conn->cm_id->port_num;
2124         u64 addr;
2125         u32 rkey, offset;
2126         int ret;
2127
2128         if (cmd->ctx_init_done)
2129                 goto rdma_ctx_post;
2130
2131         if (dir == DMA_FROM_DEVICE) {
2132                 addr = cmd->write_va;
2133                 rkey = cmd->write_stag;
2134                 offset = cmd->iscsi_cmd->write_data_done;
2135         } else {
2136                 addr = cmd->read_va;
2137                 rkey = cmd->read_stag;
2138                 offset = 0;
2139         }
2140
2141         if (isert_prot_cmd(conn, se_cmd)) {
2142                 struct ib_sig_attrs sig_attrs;
2143
2144                 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2145                 if (ret)
2146                         return ret;
2147
2148                 WARN_ON_ONCE(offset);
2149                 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2150                                 se_cmd->t_data_sg, se_cmd->t_data_nents,
2151                                 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2152                                 &sig_attrs, addr, rkey, dir);
2153         } else {
2154                 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2155                                 se_cmd->t_data_sg, se_cmd->t_data_nents,
2156                                 offset, addr, rkey, dir);
2157         }
2158
2159         if (ret < 0) {
2160                 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2161                 return ret;
2162         }
2163
2164         cmd->ctx_init_done = true;
2165
2166 rdma_ctx_post:
2167         ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2168         if (ret < 0)
2169                 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2170         return ret;
2171 }
2172
2173 static int
2174 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2175 {
2176         struct se_cmd *se_cmd = &cmd->se_cmd;
2177         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2178         struct isert_conn *isert_conn = conn->context;
2179         struct ib_cqe *cqe = NULL;
2180         struct ib_send_wr *chain_wr = NULL;
2181         int rc;
2182
2183         isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2184                  isert_cmd, se_cmd->data_length);
2185
2186         if (isert_prot_cmd(isert_conn, se_cmd)) {
2187                 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2188                 cqe = &isert_cmd->tx_desc.tx_cqe;
2189         } else {
2190                 /*
2191                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2192                  */
2193                 isert_create_send_desc(isert_conn, isert_cmd,
2194                                        &isert_cmd->tx_desc);
2195                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2196                                      &isert_cmd->tx_desc.iscsi_header);
2197                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2198                 isert_init_send_wr(isert_conn, isert_cmd,
2199                                    &isert_cmd->tx_desc.send_wr);
2200
2201                 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2202                 if (rc) {
2203                         isert_err("ib_post_recv failed with %d\n", rc);
2204                         return rc;
2205                 }
2206
2207                 chain_wr = &isert_cmd->tx_desc.send_wr;
2208         }
2209
2210         rc = isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2211         isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ rc: %d\n",
2212                   isert_cmd, rc);
2213         return rc;
2214 }
2215
2216 static int
2217 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2218 {
2219         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2220         int ret;
2221
2222         isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2223                  isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2224
2225         isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2226         ret = isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2227                                      &isert_cmd->tx_desc.tx_cqe, NULL);
2228
2229         isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE rc: %d\n",
2230                  isert_cmd, ret);
2231         return ret;
2232 }
2233
2234 static int
2235 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2236 {
2237         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2238         int ret = 0;
2239
2240         switch (state) {
2241         case ISTATE_REMOVE:
2242                 spin_lock_bh(&conn->cmd_lock);
2243                 list_del_init(&cmd->i_conn_node);
2244                 spin_unlock_bh(&conn->cmd_lock);
2245                 isert_put_cmd(isert_cmd, true);
2246                 break;
2247         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2248                 ret = isert_put_nopin(cmd, conn, false);
2249                 break;
2250         default:
2251                 isert_err("Unknown immediate state: 0x%02x\n", state);
2252                 ret = -EINVAL;
2253                 break;
2254         }
2255
2256         return ret;
2257 }
2258
2259 static int
2260 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2261 {
2262         struct isert_conn *isert_conn = conn->context;
2263         int ret;
2264
2265         switch (state) {
2266         case ISTATE_SEND_LOGOUTRSP:
2267                 ret = isert_put_logout_rsp(cmd, conn);
2268                 if (!ret)
2269                         isert_conn->logout_posted = true;
2270                 break;
2271         case ISTATE_SEND_NOPIN:
2272                 ret = isert_put_nopin(cmd, conn, true);
2273                 break;
2274         case ISTATE_SEND_TASKMGTRSP:
2275                 ret = isert_put_tm_rsp(cmd, conn);
2276                 break;
2277         case ISTATE_SEND_REJECT:
2278                 ret = isert_put_reject(cmd, conn);
2279                 break;
2280         case ISTATE_SEND_TEXTRSP:
2281                 ret = isert_put_text_rsp(cmd, conn);
2282                 break;
2283         case ISTATE_SEND_STATUS:
2284                 /*
2285                  * Special case for sending non GOOD SCSI status from TX thread
2286                  * context during pre se_cmd excecution failure.
2287                  */
2288                 ret = isert_put_response(conn, cmd);
2289                 break;
2290         default:
2291                 isert_err("Unknown response state: 0x%02x\n", state);
2292                 ret = -EINVAL;
2293                 break;
2294         }
2295
2296         return ret;
2297 }
2298
2299 struct rdma_cm_id *
2300 isert_setup_id(struct isert_np *isert_np)
2301 {
2302         struct iscsi_np *np = isert_np->np;
2303         struct rdma_cm_id *id;
2304         struct sockaddr *sa;
2305         int ret;
2306
2307         sa = (struct sockaddr *)&np->np_sockaddr;
2308         isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2309
2310         id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2311                             RDMA_PS_TCP, IB_QPT_RC);
2312         if (IS_ERR(id)) {
2313                 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2314                 ret = PTR_ERR(id);
2315                 goto out;
2316         }
2317         isert_dbg("id %p context %p\n", id, id->context);
2318
2319         ret = rdma_bind_addr(id, sa);
2320         if (ret) {
2321                 isert_err("rdma_bind_addr() failed: %d\n", ret);
2322                 goto out_id;
2323         }
2324
2325         ret = rdma_listen(id, 0);
2326         if (ret) {
2327                 isert_err("rdma_listen() failed: %d\n", ret);
2328                 goto out_id;
2329         }
2330
2331         return id;
2332 out_id:
2333         rdma_destroy_id(id);
2334 out:
2335         return ERR_PTR(ret);
2336 }
2337
2338 static int
2339 isert_setup_np(struct iscsi_np *np,
2340                struct sockaddr_storage *ksockaddr)
2341 {
2342         struct isert_np *isert_np;
2343         struct rdma_cm_id *isert_lid;
2344         int ret;
2345
2346         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2347         if (!isert_np)
2348                 return -ENOMEM;
2349
2350         sema_init(&isert_np->sem, 0);
2351         mutex_init(&isert_np->mutex);
2352         INIT_LIST_HEAD(&isert_np->accepted);
2353         INIT_LIST_HEAD(&isert_np->pending);
2354         isert_np->np = np;
2355
2356         /*
2357          * Setup the np->np_sockaddr from the passed sockaddr setup
2358          * in iscsi_target_configfs.c code..
2359          */
2360         memcpy(&np->np_sockaddr, ksockaddr,
2361                sizeof(struct sockaddr_storage));
2362
2363         isert_lid = isert_setup_id(isert_np);
2364         if (IS_ERR(isert_lid)) {
2365                 ret = PTR_ERR(isert_lid);
2366                 goto out;
2367         }
2368
2369         isert_np->cm_id = isert_lid;
2370         np->np_context = isert_np;
2371
2372         return 0;
2373
2374 out:
2375         kfree(isert_np);
2376
2377         return ret;
2378 }
2379
2380 static int
2381 isert_rdma_accept(struct isert_conn *isert_conn)
2382 {
2383         struct rdma_cm_id *cm_id = isert_conn->cm_id;
2384         struct rdma_conn_param cp;
2385         int ret;
2386         struct iser_cm_hdr rsp_hdr;
2387
2388         memset(&cp, 0, sizeof(struct rdma_conn_param));
2389         cp.initiator_depth = isert_conn->initiator_depth;
2390         cp.retry_count = 7;
2391         cp.rnr_retry_count = 7;
2392
2393         memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2394         rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2395         if (!isert_conn->snd_w_inv)
2396                 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2397         cp.private_data = (void *)&rsp_hdr;
2398         cp.private_data_len = sizeof(rsp_hdr);
2399
2400         ret = rdma_accept(cm_id, &cp);
2401         if (ret) {
2402                 isert_err("rdma_accept() failed with: %d\n", ret);
2403                 return ret;
2404         }
2405
2406         return 0;
2407 }
2408
2409 static int
2410 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2411 {
2412         struct isert_conn *isert_conn = conn->context;
2413         int ret;
2414
2415         isert_info("before login_req comp conn: %p\n", isert_conn);
2416         ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2417         if (ret) {
2418                 isert_err("isert_conn %p interrupted before got login req\n",
2419                           isert_conn);
2420                 return ret;
2421         }
2422         reinit_completion(&isert_conn->login_req_comp);
2423
2424         /*
2425          * For login requests after the first PDU, isert_rx_login_req() will
2426          * kick schedule_delayed_work(&conn->login_work) as the packet is
2427          * received, which turns this callback from iscsi_target_do_login_rx()
2428          * into a NOP.
2429          */
2430         if (!login->first_request)
2431                 return 0;
2432
2433         isert_rx_login_req(isert_conn);
2434
2435         isert_info("before login_comp conn: %p\n", conn);
2436         ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2437         if (ret)
2438                 return ret;
2439
2440         isert_info("processing login->req: %p\n", login->req);
2441
2442         return 0;
2443 }
2444
2445 static void
2446 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2447                     struct isert_conn *isert_conn)
2448 {
2449         struct rdma_cm_id *cm_id = isert_conn->cm_id;
2450         struct rdma_route *cm_route = &cm_id->route;
2451
2452         conn->login_family = np->np_sockaddr.ss_family;
2453
2454         conn->login_sockaddr = cm_route->addr.dst_addr;
2455         conn->local_sockaddr = cm_route->addr.src_addr;
2456 }
2457
2458 static int
2459 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2460 {
2461         struct isert_np *isert_np = np->np_context;
2462         struct isert_conn *isert_conn;
2463         int ret;
2464
2465 accept_wait:
2466         ret = down_interruptible(&isert_np->sem);
2467         if (ret)
2468                 return -ENODEV;
2469
2470         spin_lock_bh(&np->np_thread_lock);
2471         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2472                 spin_unlock_bh(&np->np_thread_lock);
2473                 isert_dbg("np_thread_state %d\n",
2474                          np->np_thread_state);
2475                 /**
2476                  * No point in stalling here when np_thread
2477                  * is in state RESET/SHUTDOWN/EXIT - bail
2478                  **/
2479                 return -ENODEV;
2480         }
2481         spin_unlock_bh(&np->np_thread_lock);
2482
2483         mutex_lock(&isert_np->mutex);
2484         if (list_empty(&isert_np->pending)) {
2485                 mutex_unlock(&isert_np->mutex);
2486                 goto accept_wait;
2487         }
2488         isert_conn = list_first_entry(&isert_np->pending,
2489                         struct isert_conn, node);
2490         list_del_init(&isert_conn->node);
2491         mutex_unlock(&isert_np->mutex);
2492
2493         conn->context = isert_conn;
2494         isert_conn->conn = conn;
2495         isert_conn->state = ISER_CONN_BOUND;
2496
2497         isert_set_conn_info(np, conn, isert_conn);
2498
2499         isert_dbg("Processing isert_conn: %p\n", isert_conn);
2500
2501         return 0;
2502 }
2503
2504 static void
2505 isert_free_np(struct iscsi_np *np)
2506 {
2507         struct isert_np *isert_np = np->np_context;
2508         struct isert_conn *isert_conn, *n;
2509
2510         if (isert_np->cm_id)
2511                 rdma_destroy_id(isert_np->cm_id);
2512
2513         /*
2514          * FIXME: At this point we don't have a good way to insure
2515          * that at this point we don't have hanging connections that
2516          * completed RDMA establishment but didn't start iscsi login
2517          * process. So work-around this by cleaning up what ever piled
2518          * up in accepted and pending lists.
2519          */
2520         mutex_lock(&isert_np->mutex);
2521         if (!list_empty(&isert_np->pending)) {
2522                 isert_info("Still have isert pending connections\n");
2523                 list_for_each_entry_safe(isert_conn, n,
2524                                          &isert_np->pending,
2525                                          node) {
2526                         isert_info("cleaning isert_conn %p state (%d)\n",
2527                                    isert_conn, isert_conn->state);
2528                         isert_connect_release(isert_conn);
2529                 }
2530         }
2531
2532         if (!list_empty(&isert_np->accepted)) {
2533                 isert_info("Still have isert accepted connections\n");
2534                 list_for_each_entry_safe(isert_conn, n,
2535                                          &isert_np->accepted,
2536                                          node) {
2537                         isert_info("cleaning isert_conn %p state (%d)\n",
2538                                    isert_conn, isert_conn->state);
2539                         isert_connect_release(isert_conn);
2540                 }
2541         }
2542         mutex_unlock(&isert_np->mutex);
2543
2544         np->np_context = NULL;
2545         kfree(isert_np);
2546 }
2547
2548 static void isert_release_work(struct work_struct *work)
2549 {
2550         struct isert_conn *isert_conn = container_of(work,
2551                                                      struct isert_conn,
2552                                                      release_work);
2553
2554         isert_info("Starting release conn %p\n", isert_conn);
2555
2556         mutex_lock(&isert_conn->mutex);
2557         isert_conn->state = ISER_CONN_DOWN;
2558         mutex_unlock(&isert_conn->mutex);
2559
2560         isert_info("Destroying conn %p\n", isert_conn);
2561         isert_put_conn(isert_conn);
2562 }
2563
2564 static void
2565 isert_wait4logout(struct isert_conn *isert_conn)
2566 {
2567         struct iscsi_conn *conn = isert_conn->conn;
2568
2569         isert_info("conn %p\n", isert_conn);
2570
2571         if (isert_conn->logout_posted) {
2572                 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2573                 wait_for_completion_timeout(&conn->conn_logout_comp,
2574                                             SECONDS_FOR_LOGOUT_COMP * HZ);
2575         }
2576 }
2577
2578 /**
2579  * isert_put_unsol_pending_cmds() - Drop commands waiting for
2580  *     unsolicitate dataout
2581  * @conn:    iscsi connection
2582  *
2583  * We might still have commands that are waiting for unsolicited
2584  * dataouts messages. We must put the extra reference on those
2585  * before blocking on the target_wait_for_session_cmds
2586  */
2587 static void
2588 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
2589 {
2590         struct iscsi_cmd *cmd, *tmp;
2591         static LIST_HEAD(drop_cmd_list);
2592
2593         spin_lock_bh(&conn->cmd_lock);
2594         list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2595                 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2596                     (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2597                     (cmd->write_data_done < cmd->se_cmd.data_length))
2598                         list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2599         }
2600         spin_unlock_bh(&conn->cmd_lock);
2601
2602         list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2603                 list_del_init(&cmd->i_conn_node);
2604                 if (cmd->i_state != ISTATE_REMOVE) {
2605                         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2606
2607                         isert_info("conn %p dropping cmd %p\n", conn, cmd);
2608                         isert_put_cmd(isert_cmd, true);
2609                 }
2610         }
2611 }
2612
2613 static void isert_wait_conn(struct iscsi_conn *conn)
2614 {
2615         struct isert_conn *isert_conn = conn->context;
2616
2617         isert_info("Starting conn %p\n", isert_conn);
2618
2619         mutex_lock(&isert_conn->mutex);
2620         isert_conn_terminate(isert_conn);
2621         mutex_unlock(&isert_conn->mutex);
2622
2623         ib_drain_qp(isert_conn->qp);
2624         isert_put_unsol_pending_cmds(conn);
2625         isert_wait4logout(isert_conn);
2626
2627         queue_work(isert_release_wq, &isert_conn->release_work);
2628 }
2629
2630 static void isert_free_conn(struct iscsi_conn *conn)
2631 {
2632         struct isert_conn *isert_conn = conn->context;
2633
2634         ib_drain_qp(isert_conn->qp);
2635         isert_put_conn(isert_conn);
2636 }
2637
2638 static void isert_get_rx_pdu(struct iscsi_conn *conn)
2639 {
2640         struct completion comp;
2641
2642         init_completion(&comp);
2643
2644         wait_for_completion_interruptible(&comp);
2645 }
2646
2647 static struct iscsit_transport iser_target_transport = {
2648         .name                   = "IB/iSER",
2649         .transport_type         = ISCSI_INFINIBAND,
2650         .rdma_shutdown          = true,
2651         .priv_size              = sizeof(struct isert_cmd),
2652         .owner                  = THIS_MODULE,
2653         .iscsit_setup_np        = isert_setup_np,
2654         .iscsit_accept_np       = isert_accept_np,
2655         .iscsit_free_np         = isert_free_np,
2656         .iscsit_wait_conn       = isert_wait_conn,
2657         .iscsit_free_conn       = isert_free_conn,
2658         .iscsit_get_login_rx    = isert_get_login_rx,
2659         .iscsit_put_login_tx    = isert_put_login_tx,
2660         .iscsit_immediate_queue = isert_immediate_queue,
2661         .iscsit_response_queue  = isert_response_queue,
2662         .iscsit_get_dataout     = isert_get_dataout,
2663         .iscsit_queue_data_in   = isert_put_datain,
2664         .iscsit_queue_status    = isert_put_response,
2665         .iscsit_aborted_task    = isert_aborted_task,
2666         .iscsit_get_rx_pdu      = isert_get_rx_pdu,
2667         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2668 };
2669
2670 static int __init isert_init(void)
2671 {
2672         int ret;
2673
2674         isert_comp_wq = alloc_workqueue("isert_comp_wq",
2675                                         WQ_UNBOUND | WQ_HIGHPRI, 0);
2676         if (!isert_comp_wq) {
2677                 isert_err("Unable to allocate isert_comp_wq\n");
2678                 return -ENOMEM;
2679         }
2680
2681         isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2682                                         WQ_UNBOUND_MAX_ACTIVE);
2683         if (!isert_release_wq) {
2684                 isert_err("Unable to allocate isert_release_wq\n");
2685                 ret = -ENOMEM;
2686                 goto destroy_comp_wq;
2687         }
2688
2689         iscsit_register_transport(&iser_target_transport);
2690         isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2691
2692         return 0;
2693
2694 destroy_comp_wq:
2695         destroy_workqueue(isert_comp_wq);
2696
2697         return ret;
2698 }
2699
2700 static void __exit isert_exit(void)
2701 {
2702         flush_scheduled_work();
2703         destroy_workqueue(isert_release_wq);
2704         destroy_workqueue(isert_comp_wq);
2705         iscsit_unregister_transport(&iser_target_transport);
2706         isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2707 }
2708
2709 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2710 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2711 MODULE_LICENSE("GPL");
2712
2713 module_init(isert_init);
2714 module_exit(isert_exit);