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/ib_cm.h>
  19 #include <rdma/rdma_cm.h>
  20 #include <target/target_core_base.h>
  21 #include <target/target_core_fabric.h>
  22 #include <target/iscsi/iscsi_transport.h>
  23 #include <linux/semaphore.h>
  24
  25 #include "ib_isert.h"
  26
  27 static int isert_debug_level;
  28 module_param_named(debug_level, isert_debug_level, int, 0644);
  29 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
  30
  31 static int isert_sg_tablesize_set(const char *val,
  32                                   const struct kernel_param *kp);
  33 static const struct kernel_param_ops sg_tablesize_ops = {
  34         .set = isert_sg_tablesize_set,
  35         .get = param_get_int,
  36 };
  37
  38 static int isert_sg_tablesize = ISCSI_ISER_MIN_SG_TABLESIZE;
  39 module_param_cb(sg_tablesize, &sg_tablesize_ops, &isert_sg_tablesize, 0644);
  40 MODULE_PARM_DESC(sg_tablesize,
  41                  "Number of gather/scatter entries in a single scsi command, should >= 128 (default: 128, max: 4096)");
  42
  43 static DEFINE_MUTEX(device_list_mutex);
  44 static LIST_HEAD(device_list);
  45 static struct workqueue_struct *isert_login_wq;
  46 static struct workqueue_struct *isert_comp_wq;
  47 static struct workqueue_struct *isert_release_wq;
  48
  49 static int
  50 isert_put_response(struct iscsit_conn *conn, struct iscsit_cmd *cmd);
  51 static int
  52 isert_login_post_recv(struct isert_conn *isert_conn);
  53 static int
  54 isert_rdma_accept(struct isert_conn *isert_conn);
  55 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
  56
  57 static void isert_release_work(struct work_struct *work);
  58 static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc);
  59 static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
  60 static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
  61 static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc);
  62
  63 static int isert_sg_tablesize_set(const char *val, const struct kernel_param *kp)
  64 {
  65         int n = 0, ret;
  66
  67         ret = kstrtoint(val, 10, &n);
  68         if (ret != 0 || n < ISCSI_ISER_MIN_SG_TABLESIZE ||
  69             n > ISCSI_ISER_MAX_SG_TABLESIZE)
  70                 return -EINVAL;
  71
  72         return param_set_int(val, kp);
  73 }
  74
  75 static inline bool
  76 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
  77 {
  78         return (conn->pi_support &&
  79                 cmd->prot_op != TARGET_PROT_NORMAL);
  80 }
  81
  82 static void
  83 isert_qp_event_callback(struct ib_event *e, void *context)
  84 {
  85         struct isert_conn *isert_conn = context;
  86
  87         isert_err("%s (%d): conn %p\n",
  88                   ib_event_msg(e->event), e->event, isert_conn);
  89
  90         switch (e->event) {
  91         case IB_EVENT_COMM_EST:
  92                 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
  93                 break;
  94         case IB_EVENT_QP_LAST_WQE_REACHED:
  95                 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
  96                 break;
  97         default:
  98                 break;
  99         }
 100 }
 101
 102 static struct ib_qp *
 103 isert_create_qp(struct isert_conn *isert_conn,
 104                 struct rdma_cm_id *cma_id)
 105 {
 106         u32 cq_size = ISERT_QP_MAX_REQ_DTOS + ISERT_QP_MAX_RECV_DTOS + 2;
 107         struct isert_device *device = isert_conn->device;
 108         struct ib_device *ib_dev = device->ib_device;
 109         struct ib_qp_init_attr attr;
 110         int ret, factor;
 111
 112         isert_conn->cq = ib_cq_pool_get(ib_dev, cq_size, -1, IB_POLL_WORKQUEUE);
 113         if (IS_ERR(isert_conn->cq)) {
 114                 isert_err("Unable to allocate cq\n");
 115                 ret = PTR_ERR(isert_conn->cq);
 116                 return ERR_PTR(ret);
 117         }
 118         isert_conn->cq_size = cq_size;
 119
 120         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 121         attr.event_handler = isert_qp_event_callback;
 122         attr.qp_context = isert_conn;
 123         attr.send_cq = isert_conn->cq;
 124         attr.recv_cq = isert_conn->cq;
 125         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1;
 126         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
 127         factor = rdma_rw_mr_factor(device->ib_device, cma_id->port_num,
 128                                    isert_sg_tablesize);
 129         attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX * factor;
 130         attr.cap.max_send_sge = device->ib_device->attrs.max_send_sge;
 131         attr.cap.max_recv_sge = 1;
 132         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 133         attr.qp_type = IB_QPT_RC;
 134         if (device->pi_capable)
 135                 attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN;
 136
 137         ret = rdma_create_qp(cma_id, device->pd, &attr);
 138         if (ret) {
 139                 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
 140                 ib_cq_pool_put(isert_conn->cq, isert_conn->cq_size);
 141
 142                 return ERR_PTR(ret);
 143         }
 144
 145         return cma_id->qp;
 146 }
 147
 148 static int
 149 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 150 {
 151         struct isert_device *device = isert_conn->device;
 152         struct ib_device *ib_dev = device->ib_device;
 153         struct iser_rx_desc *rx_desc;
 154         struct ib_sge *rx_sg;
 155         u64 dma_addr;
 156         int i, j;
 157
 158         isert_conn->rx_descs = kcalloc(ISERT_QP_MAX_RECV_DTOS,
 159                                        sizeof(struct iser_rx_desc),
 160                                        GFP_KERNEL);
 161         if (!isert_conn->rx_descs)
 162                 return -ENOMEM;
 163
 164         rx_desc = isert_conn->rx_descs;
 165
 166         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 167                 dma_addr = ib_dma_map_single(ib_dev, rx_desc->buf,
 168                                         ISER_RX_SIZE, DMA_FROM_DEVICE);
 169                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 170                         goto dma_map_fail;
 171
 172                 rx_desc->dma_addr = dma_addr;
 173
 174                 rx_sg = &rx_desc->rx_sg;
 175                 rx_sg->addr = rx_desc->dma_addr + isert_get_hdr_offset(rx_desc);
 176                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 177                 rx_sg->lkey = device->pd->local_dma_lkey;
 178                 rx_desc->rx_cqe.done = isert_recv_done;
 179         }
 180
 181         return 0;
 182
 183 dma_map_fail:
 184         rx_desc = isert_conn->rx_descs;
 185         for (j = 0; j < i; j++, rx_desc++) {
 186                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 187                                     ISER_RX_SIZE, DMA_FROM_DEVICE);
 188         }
 189         kfree(isert_conn->rx_descs);
 190         isert_conn->rx_descs = NULL;
 191         isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
 192         return -ENOMEM;
 193 }
 194
 195 static void
 196 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 197 {
 198         struct ib_device *ib_dev = isert_conn->device->ib_device;
 199         struct iser_rx_desc *rx_desc;
 200         int i;
 201
 202         if (!isert_conn->rx_descs)
 203                 return;
 204
 205         rx_desc = isert_conn->rx_descs;
 206         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 207                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 208                                     ISER_RX_SIZE, DMA_FROM_DEVICE);
 209         }
 210
 211         kfree(isert_conn->rx_descs);
 212         isert_conn->rx_descs = NULL;
 213 }
 214
 215 static int
 216 isert_create_device_ib_res(struct isert_device *device)
 217 {
 218         struct ib_device *ib_dev = device->ib_device;
 219         int ret;
 220
 221         isert_dbg("devattr->max_send_sge: %d devattr->max_recv_sge %d\n",
 222                   ib_dev->attrs.max_send_sge, ib_dev->attrs.max_recv_sge);
 223         isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
 224
 225         device->pd = ib_alloc_pd(ib_dev, 0);
 226         if (IS_ERR(device->pd)) {
 227                 ret = PTR_ERR(device->pd);
 228                 isert_err("failed to allocate pd, device %p, ret=%d\n",
 229                           device, ret);
 230                 return ret;
 231         }
 232
 233         /* Check signature cap */
 234         if (ib_dev->attrs.kernel_cap_flags & IBK_INTEGRITY_HANDOVER)
 235                 device->pi_capable = true;
 236         else
 237                 device->pi_capable = false;
 238
 239         return 0;
 240 }
 241
 242 static void
 243 isert_free_device_ib_res(struct isert_device *device)
 244 {
 245         isert_info("device %p\n", device);
 246
 247         ib_dealloc_pd(device->pd);
 248 }
 249
 250 static void
 251 isert_device_put(struct isert_device *device)
 252 {
 253         mutex_lock(&device_list_mutex);
 254         device->refcount--;
 255         isert_info("device %p refcount %d\n", device, device->refcount);
 256         if (!device->refcount) {
 257                 isert_free_device_ib_res(device);
 258                 list_del(&device->dev_node);
 259                 kfree(device);
 260         }
 261         mutex_unlock(&device_list_mutex);
 262 }
 263
 264 static struct isert_device *
 265 isert_device_get(struct rdma_cm_id *cma_id)
 266 {
 267         struct isert_device *device;
 268         int ret;
 269
 270         mutex_lock(&device_list_mutex);
 271         list_for_each_entry(device, &device_list, dev_node) {
 272                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 273                         device->refcount++;
 274                         isert_info("Found iser device %p refcount %d\n",
 275                                    device, device->refcount);
 276                         mutex_unlock(&device_list_mutex);
 277                         return device;
 278                 }
 279         }
 280
 281         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 282         if (!device) {
 283                 mutex_unlock(&device_list_mutex);
 284                 return ERR_PTR(-ENOMEM);
 285         }
 286
 287         INIT_LIST_HEAD(&device->dev_node);
 288
 289         device->ib_device = cma_id->device;
 290         ret = isert_create_device_ib_res(device);
 291         if (ret) {
 292                 kfree(device);
 293                 mutex_unlock(&device_list_mutex);
 294                 return ERR_PTR(ret);
 295         }
 296
 297         device->refcount++;
 298         list_add_tail(&device->dev_node, &device_list);
 299         isert_info("Created a new iser device %p refcount %d\n",
 300                    device, device->refcount);
 301         mutex_unlock(&device_list_mutex);
 302
 303         return device;
 304 }
 305
 306 static void
 307 isert_init_conn(struct isert_conn *isert_conn)
 308 {
 309         isert_conn->state = ISER_CONN_INIT;
 310         INIT_LIST_HEAD(&isert_conn->node);
 311         init_completion(&isert_conn->login_comp);
 312         init_completion(&isert_conn->login_req_comp);
 313         init_waitqueue_head(&isert_conn->rem_wait);
 314         kref_init(&isert_conn->kref);
 315         mutex_init(&isert_conn->mutex);
 316         INIT_WORK(&isert_conn->release_work, isert_release_work);
 317 }
 318
 319 static void
 320 isert_free_login_buf(struct isert_conn *isert_conn)
 321 {
 322         struct ib_device *ib_dev = isert_conn->device->ib_device;
 323
 324         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 325                             ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
 326         kfree(isert_conn->login_rsp_buf);
 327
 328         ib_dma_unmap_single(ib_dev, isert_conn->login_desc->dma_addr,
 329                             ISER_RX_SIZE, DMA_FROM_DEVICE);
 330         kfree(isert_conn->login_desc);
 331 }
 332
 333 static int
 334 isert_alloc_login_buf(struct isert_conn *isert_conn,
 335                       struct ib_device *ib_dev)
 336 {
 337         int ret;
 338
 339         isert_conn->login_desc = kzalloc(sizeof(*isert_conn->login_desc),
 340                         GFP_KERNEL);
 341         if (!isert_conn->login_desc)
 342                 return -ENOMEM;
 343
 344         isert_conn->login_desc->dma_addr = ib_dma_map_single(ib_dev,
 345                                 isert_conn->login_desc->buf,
 346                                 ISER_RX_SIZE, DMA_FROM_DEVICE);
 347         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_desc->dma_addr);
 348         if (ret) {
 349                 isert_err("login_desc dma mapping error: %d\n", ret);
 350                 isert_conn->login_desc->dma_addr = 0;
 351                 goto out_free_login_desc;
 352         }
 353
 354         isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
 355         if (!isert_conn->login_rsp_buf) {
 356                 ret = -ENOMEM;
 357                 goto out_unmap_login_desc;
 358         }
 359
 360         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 361                                         isert_conn->login_rsp_buf,
 362                                         ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
 363         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 364         if (ret) {
 365                 isert_err("login_rsp_dma mapping error: %d\n", ret);
 366                 isert_conn->login_rsp_dma = 0;
 367                 goto out_free_login_rsp_buf;
 368         }
 369
 370         return 0;
 371
 372 out_free_login_rsp_buf:
 373         kfree(isert_conn->login_rsp_buf);
 374 out_unmap_login_desc:
 375         ib_dma_unmap_single(ib_dev, isert_conn->login_desc->dma_addr,
 376                             ISER_RX_SIZE, DMA_FROM_DEVICE);
 377 out_free_login_desc:
 378         kfree(isert_conn->login_desc);
 379         return ret;
 380 }
 381
 382 static void
 383 isert_set_nego_params(struct isert_conn *isert_conn,
 384                       struct rdma_conn_param *param)
 385 {
 386         struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
 387
 388         /* Set max inflight RDMA READ requests */
 389         isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
 390                                 attr->max_qp_init_rd_atom);
 391         isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
 392
 393         if (param->private_data) {
 394                 u8 flags = *(u8 *)param->private_data;
 395
 396                 /*
 397                  * use remote invalidation if the both initiator
 398                  * and the HCA support it
 399                  */
 400                 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
 401                                           (attr->device_cap_flags &
 402                                            IB_DEVICE_MEM_MGT_EXTENSIONS);
 403                 if (isert_conn->snd_w_inv)
 404                         isert_info("Using remote invalidation\n");
 405         }
 406 }
 407
 408 static void
 409 isert_destroy_qp(struct isert_conn *isert_conn)
 410 {
 411         ib_destroy_qp(isert_conn->qp);
 412         ib_cq_pool_put(isert_conn->cq, isert_conn->cq_size);
 413 }
 414
 415 static int
 416 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 417 {
 418         struct isert_np *isert_np = cma_id->context;
 419         struct iscsi_np *np = isert_np->np;
 420         struct isert_conn *isert_conn;
 421         struct isert_device *device;
 422         int ret = 0;
 423
 424         spin_lock_bh(&np->np_thread_lock);
 425         if (!np->enabled) {
 426                 spin_unlock_bh(&np->np_thread_lock);
 427                 isert_dbg("iscsi_np is not enabled, reject connect request\n");
 428                 return rdma_reject(cma_id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED);
 429         }
 430         spin_unlock_bh(&np->np_thread_lock);
 431
 432         isert_dbg("cma_id: %p, portal: %p\n",
 433                  cma_id, cma_id->context);
 434
 435         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 436         if (!isert_conn)
 437                 return -ENOMEM;
 438
 439         isert_init_conn(isert_conn);
 440         isert_conn->cm_id = cma_id;
 441
 442         device = isert_device_get(cma_id);
 443         if (IS_ERR(device)) {
 444                 ret = PTR_ERR(device);
 445                 goto out;
 446         }
 447         isert_conn->device = device;
 448
 449         ret = isert_alloc_login_buf(isert_conn, cma_id->device);
 450         if (ret)
 451                 goto out_conn_dev;
 452
 453         isert_set_nego_params(isert_conn, &event->param.conn);
 454
 455         isert_conn->qp = isert_create_qp(isert_conn, cma_id);
 456         if (IS_ERR(isert_conn->qp)) {
 457                 ret = PTR_ERR(isert_conn->qp);
 458                 goto out_rsp_dma_map;
 459         }
 460
 461         ret = isert_login_post_recv(isert_conn);
 462         if (ret)
 463                 goto out_destroy_qp;
 464
 465         ret = isert_rdma_accept(isert_conn);
 466         if (ret)
 467                 goto out_destroy_qp;
 468
 469         mutex_lock(&isert_np->mutex);
 470         list_add_tail(&isert_conn->node, &isert_np->accepted);
 471         mutex_unlock(&isert_np->mutex);
 472
 473         return 0;
 474
 475 out_destroy_qp:
 476         isert_destroy_qp(isert_conn);
 477 out_rsp_dma_map:
 478         isert_free_login_buf(isert_conn);
 479 out_conn_dev:
 480         isert_device_put(device);
 481 out:
 482         kfree(isert_conn);
 483         rdma_reject(cma_id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED);
 484         return ret;
 485 }
 486
 487 static void
 488 isert_connect_release(struct isert_conn *isert_conn)
 489 {
 490         struct isert_device *device = isert_conn->device;
 491
 492         isert_dbg("conn %p\n", isert_conn);
 493
 494         BUG_ON(!device);
 495
 496         isert_free_rx_descriptors(isert_conn);
 497         if (isert_conn->cm_id &&
 498             !isert_conn->dev_removed)
 499                 rdma_destroy_id(isert_conn->cm_id);
 500
 501         if (isert_conn->qp)
 502                 isert_destroy_qp(isert_conn);
 503
 504         if (isert_conn->login_desc)
 505                 isert_free_login_buf(isert_conn);
 506
 507         isert_device_put(device);
 508
 509         if (isert_conn->dev_removed)
 510                 wake_up_interruptible(&isert_conn->rem_wait);
 511         else
 512                 kfree(isert_conn);
 513 }
 514
 515 static void
 516 isert_connected_handler(struct rdma_cm_id *cma_id)
 517 {
 518         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 519         struct isert_np *isert_np = cma_id->context;
 520
 521         isert_info("conn %p\n", isert_conn);
 522
 523         mutex_lock(&isert_conn->mutex);
 524         isert_conn->state = ISER_CONN_UP;
 525         kref_get(&isert_conn->kref);
 526         mutex_unlock(&isert_conn->mutex);
 527
 528         mutex_lock(&isert_np->mutex);
 529         list_move_tail(&isert_conn->node, &isert_np->pending);
 530         mutex_unlock(&isert_np->mutex);
 531
 532         isert_info("np %p: Allow accept_np to continue\n", isert_np);
 533         up(&isert_np->sem);
 534 }
 535
 536 static void
 537 isert_release_kref(struct kref *kref)
 538 {
 539         struct isert_conn *isert_conn = container_of(kref,
 540                                 struct isert_conn, kref);
 541
 542         isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
 543                    current->pid);
 544
 545         isert_connect_release(isert_conn);
 546 }
 547
 548 static void
 549 isert_put_conn(struct isert_conn *isert_conn)
 550 {
 551         kref_put(&isert_conn->kref, isert_release_kref);
 552 }
 553
 554 static void
 555 isert_handle_unbound_conn(struct isert_conn *isert_conn)
 556 {
 557         struct isert_np *isert_np = isert_conn->cm_id->context;
 558
 559         mutex_lock(&isert_np->mutex);
 560         if (!list_empty(&isert_conn->node)) {
 561                 /*
 562                  * This means iscsi doesn't know this connection
 563                  * so schedule a cleanup ourselves
 564                  */
 565                 list_del_init(&isert_conn->node);
 566                 isert_put_conn(isert_conn);
 567                 queue_work(isert_release_wq, &isert_conn->release_work);
 568         }
 569         mutex_unlock(&isert_np->mutex);
 570 }
 571
 572 /**
 573  * isert_conn_terminate() - Initiate connection termination
 574  * @isert_conn: isert connection struct
 575  *
 576  * Notes:
 577  * In case the connection state is BOUND, move state
 578  * to TEMINATING and start teardown sequence (rdma_disconnect).
 579  * In case the connection state is UP, complete flush as well.
 580  *
 581  * This routine must be called with mutex held. Thus it is
 582  * safe to call multiple times.
 583  */
 584 static void
 585 isert_conn_terminate(struct isert_conn *isert_conn)
 586 {
 587         int err;
 588
 589         if (isert_conn->state >= ISER_CONN_TERMINATING)
 590                 return;
 591
 592         isert_info("Terminating conn %p state %d\n",
 593                    isert_conn, isert_conn->state);
 594         isert_conn->state = ISER_CONN_TERMINATING;
 595         err = rdma_disconnect(isert_conn->cm_id);
 596         if (err)
 597                 isert_warn("Failed rdma_disconnect isert_conn %p\n",
 598                            isert_conn);
 599 }
 600
 601 static int
 602 isert_np_cma_handler(struct isert_np *isert_np,
 603                      enum rdma_cm_event_type event)
 604 {
 605         isert_dbg("%s (%d): isert np %p\n",
 606                   rdma_event_msg(event), event, isert_np);
 607
 608         switch (event) {
 609         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 610                 isert_np->cm_id = NULL;
 611                 break;
 612         case RDMA_CM_EVENT_ADDR_CHANGE:
 613                 isert_np->cm_id = isert_setup_id(isert_np);
 614                 if (IS_ERR(isert_np->cm_id)) {
 615                         isert_err("isert np %p setup id failed: %ld\n",
 616                                   isert_np, PTR_ERR(isert_np->cm_id));
 617                         isert_np->cm_id = NULL;
 618                 }
 619                 break;
 620         default:
 621                 isert_err("isert np %p Unexpected event %d\n",
 622                           isert_np, event);
 623         }
 624
 625         return -1;
 626 }
 627
 628 static int
 629 isert_disconnected_handler(struct rdma_cm_id *cma_id,
 630                            enum rdma_cm_event_type event)
 631 {
 632         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 633
 634         mutex_lock(&isert_conn->mutex);
 635         switch (isert_conn->state) {
 636         case ISER_CONN_TERMINATING:
 637                 break;
 638         case ISER_CONN_UP:
 639                 isert_conn_terminate(isert_conn);
 640                 ib_drain_qp(isert_conn->qp);
 641                 isert_handle_unbound_conn(isert_conn);
 642                 break;
 643         case ISER_CONN_BOUND:
 644         case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
 645                 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
 646                 break;
 647         default:
 648                 isert_warn("conn %p terminating in state %d\n",
 649                            isert_conn, isert_conn->state);
 650         }
 651         mutex_unlock(&isert_conn->mutex);
 652
 653         return 0;
 654 }
 655
 656 static int
 657 isert_connect_error(struct rdma_cm_id *cma_id)
 658 {
 659         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 660         struct isert_np *isert_np = cma_id->context;
 661
 662         ib_drain_qp(isert_conn->qp);
 663
 664         mutex_lock(&isert_np->mutex);
 665         list_del_init(&isert_conn->node);
 666         mutex_unlock(&isert_np->mutex);
 667         isert_conn->cm_id = NULL;
 668         isert_put_conn(isert_conn);
 669
 670         return -1;
 671 }
 672
 673 static int
 674 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 675 {
 676         struct isert_np *isert_np = cma_id->context;
 677         struct isert_conn *isert_conn;
 678         int ret = 0;
 679
 680         isert_info("%s (%d): status %d id %p np %p\n",
 681                    rdma_event_msg(event->event), event->event,
 682                    event->status, cma_id, cma_id->context);
 683
 684         if (isert_np->cm_id == cma_id)
 685                 return isert_np_cma_handler(cma_id->context, event->event);
 686
 687         switch (event->event) {
 688         case RDMA_CM_EVENT_CONNECT_REQUEST:
 689                 ret = isert_connect_request(cma_id, event);
 690                 if (ret)
 691                         isert_err("failed handle connect request %d\n", ret);
 692                 break;
 693         case RDMA_CM_EVENT_ESTABLISHED:
 694                 isert_connected_handler(cma_id);
 695                 break;
 696         case RDMA_CM_EVENT_ADDR_CHANGE:
 697         case RDMA_CM_EVENT_DISCONNECTED:
 698         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
 699                 ret = isert_disconnected_handler(cma_id, event->event);
 700                 break;
 701         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 702                 isert_conn = cma_id->qp->qp_context;
 703                 isert_conn->dev_removed = true;
 704                 isert_disconnected_handler(cma_id, event->event);
 705                 wait_event_interruptible(isert_conn->rem_wait,
 706                                          isert_conn->state == ISER_CONN_DOWN);
 707                 kfree(isert_conn);
 708                 /*
 709                  * return non-zero from the callback to destroy
 710                  * the rdma cm id
 711                  */
 712                 return 1;
 713         case RDMA_CM_EVENT_REJECTED:
 714                 isert_info("Connection rejected: %s\n",
 715                            rdma_reject_msg(cma_id, event->status));
 716                 fallthrough;
 717         case RDMA_CM_EVENT_UNREACHABLE:
 718         case RDMA_CM_EVENT_CONNECT_ERROR:
 719                 ret = isert_connect_error(cma_id);
 720                 break;
 721         default:
 722                 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
 723                 break;
 724         }
 725
 726         return ret;
 727 }
 728
 729 static int
 730 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
 731 {
 732         struct ib_recv_wr *rx_wr;
 733         int i, ret;
 734         struct iser_rx_desc *rx_desc;
 735
 736         for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
 737                 rx_desc = &isert_conn->rx_descs[i];
 738
 739                 rx_wr->wr_cqe = &rx_desc->rx_cqe;
 740                 rx_wr->sg_list = &rx_desc->rx_sg;
 741                 rx_wr->num_sge = 1;
 742                 rx_wr->next = rx_wr + 1;
 743                 rx_desc->in_use = false;
 744         }
 745         rx_wr--;
 746         rx_wr->next = NULL; /* mark end of work requests list */
 747
 748         ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr, NULL);
 749         if (ret)
 750                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 751
 752         return ret;
 753 }
 754
 755 static int
 756 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
 757 {
 758         struct ib_recv_wr rx_wr;
 759         int ret;
 760
 761         if (!rx_desc->in_use) {
 762                 /*
 763                  * if the descriptor is not in-use we already reposted it
 764                  * for recv, so just silently return
 765                  */
 766                 return 0;
 767         }
 768
 769         rx_desc->in_use = false;
 770         rx_wr.wr_cqe = &rx_desc->rx_cqe;
 771         rx_wr.sg_list = &rx_desc->rx_sg;
 772         rx_wr.num_sge = 1;
 773         rx_wr.next = NULL;
 774
 775         ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL);
 776         if (ret)
 777                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 778
 779         return ret;
 780 }
 781
 782 static int
 783 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 784 {
 785         struct ib_device *ib_dev = isert_conn->cm_id->device;
 786         struct ib_send_wr send_wr;
 787         int ret;
 788
 789         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 790                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 791
 792         tx_desc->tx_cqe.done = isert_login_send_done;
 793
 794         send_wr.next    = NULL;
 795         send_wr.wr_cqe  = &tx_desc->tx_cqe;
 796         send_wr.sg_list = tx_desc->tx_sg;
 797         send_wr.num_sge = tx_desc->num_sge;
 798         send_wr.opcode  = IB_WR_SEND;
 799         send_wr.send_flags = IB_SEND_SIGNALED;
 800
 801         ret = ib_post_send(isert_conn->qp, &send_wr, NULL);
 802         if (ret)
 803                 isert_err("ib_post_send() failed, ret: %d\n", ret);
 804
 805         return ret;
 806 }
 807
 808 static void
 809 __isert_create_send_desc(struct isert_device *device,
 810                          struct iser_tx_desc *tx_desc)
 811 {
 812
 813         memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
 814         tx_desc->iser_header.flags = ISCSI_CTRL;
 815
 816         tx_desc->num_sge = 1;
 817
 818         if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
 819                 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
 820                 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 821         }
 822 }
 823
 824 static void
 825 isert_create_send_desc(struct isert_conn *isert_conn,
 826                        struct isert_cmd *isert_cmd,
 827                        struct iser_tx_desc *tx_desc)
 828 {
 829         struct isert_device *device = isert_conn->device;
 830         struct ib_device *ib_dev = device->ib_device;
 831
 832         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 833                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 834
 835         __isert_create_send_desc(device, tx_desc);
 836 }
 837
 838 static int
 839 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 840                    struct iser_tx_desc *tx_desc)
 841 {
 842         struct isert_device *device = isert_conn->device;
 843         struct ib_device *ib_dev = device->ib_device;
 844         u64 dma_addr;
 845
 846         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 847                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 848         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 849                 isert_err("ib_dma_mapping_error() failed\n");
 850                 return -ENOMEM;
 851         }
 852
 853         tx_desc->dma_addr = dma_addr;
 854         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 855         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 856         tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
 857
 858         isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
 859                   tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
 860                   tx_desc->tx_sg[0].lkey);
 861
 862         return 0;
 863 }
 864
 865 static void
 866 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 867                    struct ib_send_wr *send_wr)
 868 {
 869         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 870
 871         tx_desc->tx_cqe.done = isert_send_done;
 872         send_wr->wr_cqe = &tx_desc->tx_cqe;
 873
 874         if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
 875                 send_wr->opcode  = IB_WR_SEND_WITH_INV;
 876                 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
 877         } else {
 878                 send_wr->opcode = IB_WR_SEND;
 879         }
 880
 881         send_wr->sg_list = &tx_desc->tx_sg[0];
 882         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 883         send_wr->send_flags = IB_SEND_SIGNALED;
 884 }
 885
 886 static int
 887 isert_login_post_recv(struct isert_conn *isert_conn)
 888 {
 889         struct ib_recv_wr rx_wr;
 890         struct ib_sge sge;
 891         int ret;
 892
 893         memset(&sge, 0, sizeof(struct ib_sge));
 894         sge.addr = isert_conn->login_desc->dma_addr +
 895                 isert_get_hdr_offset(isert_conn->login_desc);
 896         sge.length = ISER_RX_PAYLOAD_SIZE;
 897         sge.lkey = isert_conn->device->pd->local_dma_lkey;
 898
 899         isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
 900                 sge.addr, sge.length, sge.lkey);
 901
 902         isert_conn->login_desc->rx_cqe.done = isert_login_recv_done;
 903
 904         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
 905         rx_wr.wr_cqe = &isert_conn->login_desc->rx_cqe;
 906         rx_wr.sg_list = &sge;
 907         rx_wr.num_sge = 1;
 908
 909         ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL);
 910         if (ret)
 911                 isert_err("ib_post_recv() failed: %d\n", ret);
 912
 913         return ret;
 914 }
 915
 916 static int
 917 isert_put_login_tx(struct iscsit_conn *conn, struct iscsi_login *login,
 918                    u32 length)
 919 {
 920         struct isert_conn *isert_conn = conn->context;
 921         struct isert_device *device = isert_conn->device;
 922         struct ib_device *ib_dev = device->ib_device;
 923         struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
 924         int ret;
 925
 926         __isert_create_send_desc(device, tx_desc);
 927
 928         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
 929                sizeof(struct iscsi_hdr));
 930
 931         isert_init_tx_hdrs(isert_conn, tx_desc);
 932
 933         if (length > 0) {
 934                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
 935
 936                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
 937                                            length, DMA_TO_DEVICE);
 938
 939                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
 940
 941                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
 942                                               length, DMA_TO_DEVICE);
 943
 944                 tx_dsg->addr    = isert_conn->login_rsp_dma;
 945                 tx_dsg->length  = length;
 946                 tx_dsg->lkey    = isert_conn->device->pd->local_dma_lkey;
 947                 tx_desc->num_sge = 2;
 948         }
 949         if (!login->login_failed) {
 950                 if (login->login_complete) {
 951                         ret = isert_alloc_rx_descriptors(isert_conn);
 952                         if (ret)
 953                                 return ret;
 954
 955                         ret = isert_post_recvm(isert_conn,
 956                                                ISERT_QP_MAX_RECV_DTOS);
 957                         if (ret)
 958                                 return ret;
 959
 960                         /* Now we are in FULL_FEATURE phase */
 961                         mutex_lock(&isert_conn->mutex);
 962                         isert_conn->state = ISER_CONN_FULL_FEATURE;
 963                         mutex_unlock(&isert_conn->mutex);
 964                         goto post_send;
 965                 }
 966
 967                 ret = isert_login_post_recv(isert_conn);
 968                 if (ret)
 969                         return ret;
 970         }
 971 post_send:
 972         ret = isert_login_post_send(isert_conn, tx_desc);
 973         if (ret)
 974                 return ret;
 975
 976         return 0;
 977 }
 978
 979 static void
 980 isert_rx_login_req(struct isert_conn *isert_conn)
 981 {
 982         struct iser_rx_desc *rx_desc = isert_conn->login_desc;
 983         int rx_buflen = isert_conn->login_req_len;
 984         struct iscsit_conn *conn = isert_conn->conn;
 985         struct iscsi_login *login = conn->conn_login;
 986         int size;
 987
 988         isert_info("conn %p\n", isert_conn);
 989
 990         WARN_ON_ONCE(!login);
 991
 992         if (login->first_request) {
 993                 struct iscsi_login_req *login_req =
 994                         (struct iscsi_login_req *)isert_get_iscsi_hdr(rx_desc);
 995                 /*
 996                  * Setup the initial iscsi_login values from the leading
 997                  * login request PDU.
 998                  */
 999                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1000                 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(
1001                                 login_req->flags);
1002                 login->version_min      = login_req->min_version;
1003                 login->version_max      = login_req->max_version;
1004                 memcpy(login->isid, login_req->isid, 6);
1005                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1006                 login->init_task_tag    = login_req->itt;
1007                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1008                 login->cid              = be16_to_cpu(login_req->cid);
1009                 login->tsih             = be16_to_cpu(login_req->tsih);
1010         }
1011
1012         memcpy(&login->req[0], isert_get_iscsi_hdr(rx_desc), ISCSI_HDR_LEN);
1013
1014         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1015         isert_dbg("Using login payload size: %d, rx_buflen: %d "
1016                   "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1017                   MAX_KEY_VALUE_PAIRS);
1018         memcpy(login->req_buf, isert_get_data(rx_desc), size);
1019
1020         if (login->first_request) {
1021                 complete(&isert_conn->login_comp);
1022                 return;
1023         }
1024         queue_delayed_work(isert_login_wq, &conn->login_work, 0);
1025 }
1026
1027 static struct iscsit_cmd
1028 *isert_allocate_cmd(struct iscsit_conn *conn, struct iser_rx_desc *rx_desc)
1029 {
1030         struct isert_conn *isert_conn = conn->context;
1031         struct isert_cmd *isert_cmd;
1032         struct iscsit_cmd *cmd;
1033
1034         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1035         if (!cmd) {
1036                 isert_err("Unable to allocate iscsit_cmd + isert_cmd\n");
1037                 return NULL;
1038         }
1039         isert_cmd = iscsit_priv_cmd(cmd);
1040         isert_cmd->conn = isert_conn;
1041         isert_cmd->iscsit_cmd = cmd;
1042         isert_cmd->rx_desc = rx_desc;
1043
1044         return cmd;
1045 }
1046
1047 static int
1048 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1049                       struct isert_cmd *isert_cmd, struct iscsit_cmd *cmd,
1050                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1051 {
1052         struct iscsit_conn *conn = isert_conn->conn;
1053         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1054         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1055         bool dump_payload = false;
1056         unsigned int data_len;
1057
1058         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1059         if (rc < 0)
1060                 return rc;
1061
1062         imm_data = cmd->immediate_data;
1063         imm_data_len = cmd->first_burst_len;
1064         unsol_data = cmd->unsolicited_data;
1065         data_len = cmd->se_cmd.data_length;
1066
1067         if (imm_data && imm_data_len == data_len)
1068                 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1069         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1070         if (rc < 0) {
1071                 return 0;
1072         } else if (rc > 0) {
1073                 dump_payload = true;
1074                 goto sequence_cmd;
1075         }
1076
1077         if (!imm_data)
1078                 return 0;
1079
1080         if (imm_data_len != data_len) {
1081                 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1082                 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1083                                     isert_get_data(rx_desc), imm_data_len);
1084                 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1085                           sg_nents, imm_data_len);
1086         } else {
1087                 sg_init_table(&isert_cmd->sg, 1);
1088                 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1089                 cmd->se_cmd.t_data_nents = 1;
1090                 sg_set_buf(&isert_cmd->sg, isert_get_data(rx_desc),
1091                                 imm_data_len);
1092                 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1093                           imm_data_len);
1094         }
1095
1096         cmd->write_data_done += imm_data_len;
1097
1098         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1099                 spin_lock_bh(&cmd->istate_lock);
1100                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1101                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1102                 spin_unlock_bh(&cmd->istate_lock);
1103         }
1104
1105 sequence_cmd:
1106         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1107
1108         if (!rc && !dump_payload && unsol_data)
1109                 iscsit_set_unsolicited_dataout(cmd);
1110         else if (dump_payload && imm_data)
1111                 target_put_sess_cmd(&cmd->se_cmd);
1112
1113         return 0;
1114 }
1115
1116 static int
1117 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1118                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1119 {
1120         struct scatterlist *sg_start;
1121         struct iscsit_conn *conn = isert_conn->conn;
1122         struct iscsit_cmd *cmd = NULL;
1123         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1124         u32 unsol_data_len = ntoh24(hdr->dlength);
1125         int rc, sg_nents, sg_off, page_off;
1126
1127         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1128         if (rc < 0)
1129                 return rc;
1130         else if (!cmd)
1131                 return 0;
1132         /*
1133          * FIXME: Unexpected unsolicited_data out
1134          */
1135         if (!cmd->unsolicited_data) {
1136                 isert_err("Received unexpected solicited data payload\n");
1137                 dump_stack();
1138                 return -1;
1139         }
1140
1141         isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1142                   "write_data_done: %u, data_length: %u\n",
1143                   unsol_data_len,  cmd->write_data_done,
1144                   cmd->se_cmd.data_length);
1145
1146         sg_off = cmd->write_data_done / PAGE_SIZE;
1147         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1148         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1149         page_off = cmd->write_data_done % PAGE_SIZE;
1150         /*
1151          * FIXME: Non page-aligned unsolicited_data out
1152          */
1153         if (page_off) {
1154                 isert_err("unexpected non-page aligned data payload\n");
1155                 dump_stack();
1156                 return -1;
1157         }
1158         isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1159                   "sg_nents: %u from %p %u\n", sg_start, sg_off,
1160                   sg_nents, isert_get_data(rx_desc), unsol_data_len);
1161
1162         sg_copy_from_buffer(sg_start, sg_nents, isert_get_data(rx_desc),
1163                             unsol_data_len);
1164
1165         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1166         if (rc < 0)
1167                 return rc;
1168
1169         /*
1170          * multiple data-outs on the same command can arrive -
1171          * so post the buffer before hand
1172          */
1173         return isert_post_recv(isert_conn, rx_desc);
1174 }
1175
1176 static int
1177 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1178                      struct iscsit_cmd *cmd, struct iser_rx_desc *rx_desc,
1179                      unsigned char *buf)
1180 {
1181         struct iscsit_conn *conn = isert_conn->conn;
1182         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1183         int rc;
1184
1185         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1186         if (rc < 0)
1187                 return rc;
1188         /*
1189          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1190          */
1191
1192         return iscsit_process_nop_out(conn, cmd, hdr);
1193 }
1194
1195 static int
1196 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1197                       struct iscsit_cmd *cmd, struct iser_rx_desc *rx_desc,
1198                       struct iscsi_text *hdr)
1199 {
1200         struct iscsit_conn *conn = isert_conn->conn;
1201         u32 payload_length = ntoh24(hdr->dlength);
1202         int rc;
1203         unsigned char *text_in = NULL;
1204
1205         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1206         if (rc < 0)
1207                 return rc;
1208
1209         if (payload_length) {
1210                 text_in = kzalloc(payload_length, GFP_KERNEL);
1211                 if (!text_in)
1212                         return -ENOMEM;
1213         }
1214         cmd->text_in_ptr = text_in;
1215
1216         memcpy(cmd->text_in_ptr, isert_get_data(rx_desc), payload_length);
1217
1218         return iscsit_process_text_cmd(conn, cmd, hdr);
1219 }
1220
1221 static int
1222 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1223                 uint32_t read_stag, uint64_t read_va,
1224                 uint32_t write_stag, uint64_t write_va)
1225 {
1226         struct iscsi_hdr *hdr = isert_get_iscsi_hdr(rx_desc);
1227         struct iscsit_conn *conn = isert_conn->conn;
1228         struct iscsit_cmd *cmd;
1229         struct isert_cmd *isert_cmd;
1230         int ret = -EINVAL;
1231         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1232
1233         if (conn->sess->sess_ops->SessionType &&
1234            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1235                 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1236                           " ignoring\n", opcode);
1237                 return 0;
1238         }
1239
1240         switch (opcode) {
1241         case ISCSI_OP_SCSI_CMD:
1242                 cmd = isert_allocate_cmd(conn, rx_desc);
1243                 if (!cmd)
1244                         break;
1245
1246                 isert_cmd = iscsit_priv_cmd(cmd);
1247                 isert_cmd->read_stag = read_stag;
1248                 isert_cmd->read_va = read_va;
1249                 isert_cmd->write_stag = write_stag;
1250                 isert_cmd->write_va = write_va;
1251                 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1252
1253                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1254                                         rx_desc, (unsigned char *)hdr);
1255                 break;
1256         case ISCSI_OP_NOOP_OUT:
1257                 cmd = isert_allocate_cmd(conn, rx_desc);
1258                 if (!cmd)
1259                         break;
1260
1261                 isert_cmd = iscsit_priv_cmd(cmd);
1262                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1263                                            rx_desc, (unsigned char *)hdr);
1264                 break;
1265         case ISCSI_OP_SCSI_DATA_OUT:
1266                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1267                                                 (unsigned char *)hdr);
1268                 break;
1269         case ISCSI_OP_SCSI_TMFUNC:
1270                 cmd = isert_allocate_cmd(conn, rx_desc);
1271                 if (!cmd)
1272                         break;
1273
1274                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1275                                                 (unsigned char *)hdr);
1276                 break;
1277         case ISCSI_OP_LOGOUT:
1278                 cmd = isert_allocate_cmd(conn, rx_desc);
1279                 if (!cmd)
1280                         break;
1281
1282                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1283                 break;
1284         case ISCSI_OP_TEXT:
1285                 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1286                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1287                 else
1288                         cmd = isert_allocate_cmd(conn, rx_desc);
1289
1290                 if (!cmd)
1291                         break;
1292
1293                 isert_cmd = iscsit_priv_cmd(cmd);
1294                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1295                                             rx_desc, (struct iscsi_text *)hdr);
1296                 break;
1297         default:
1298                 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1299                 dump_stack();
1300                 break;
1301         }
1302
1303         return ret;
1304 }
1305
1306 static void
1307 isert_print_wc(struct ib_wc *wc, const char *type)
1308 {
1309         if (wc->status != IB_WC_WR_FLUSH_ERR)
1310                 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1311                           ib_wc_status_msg(wc->status), wc->status,
1312                           wc->vendor_err);
1313         else
1314                 isert_dbg("%s failure: %s (%d)\n", type,
1315                           ib_wc_status_msg(wc->status), wc->status);
1316 }
1317
1318 static void
1319 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1320 {
1321         struct isert_conn *isert_conn = wc->qp->qp_context;
1322         struct ib_device *ib_dev = isert_conn->cm_id->device;
1323         struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1324         struct iscsi_hdr *hdr = isert_get_iscsi_hdr(rx_desc);
1325         struct iser_ctrl *iser_ctrl = isert_get_iser_hdr(rx_desc);
1326         uint64_t read_va = 0, write_va = 0;
1327         uint32_t read_stag = 0, write_stag = 0;
1328
1329         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1330                 isert_print_wc(wc, "recv");
1331                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1332                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1333                 return;
1334         }
1335
1336         rx_desc->in_use = true;
1337
1338         ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1339                         ISER_RX_SIZE, DMA_FROM_DEVICE);
1340
1341         isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1342                  rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1343                  (int)(wc->byte_len - ISER_HEADERS_LEN));
1344
1345         switch (iser_ctrl->flags & 0xF0) {
1346         case ISCSI_CTRL:
1347                 if (iser_ctrl->flags & ISER_RSV) {
1348                         read_stag = be32_to_cpu(iser_ctrl->read_stag);
1349                         read_va = be64_to_cpu(iser_ctrl->read_va);
1350                         isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1351                                   read_stag, (unsigned long long)read_va);
1352                 }
1353                 if (iser_ctrl->flags & ISER_WSV) {
1354                         write_stag = be32_to_cpu(iser_ctrl->write_stag);
1355                         write_va = be64_to_cpu(iser_ctrl->write_va);
1356                         isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1357                                   write_stag, (unsigned long long)write_va);
1358                 }
1359
1360                 isert_dbg("ISER ISCSI_CTRL PDU\n");
1361                 break;
1362         case ISER_HELLO:
1363                 isert_err("iSER Hello message\n");
1364                 break;
1365         default:
1366                 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1367                 break;
1368         }
1369
1370         isert_rx_opcode(isert_conn, rx_desc,
1371                         read_stag, read_va, write_stag, write_va);
1372
1373         ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1374                         ISER_RX_SIZE, DMA_FROM_DEVICE);
1375 }
1376
1377 static void
1378 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1379 {
1380         struct isert_conn *isert_conn = wc->qp->qp_context;
1381         struct ib_device *ib_dev = isert_conn->device->ib_device;
1382
1383         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1384                 isert_print_wc(wc, "login recv");
1385                 return;
1386         }
1387
1388         ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_desc->dma_addr,
1389                         ISER_RX_SIZE, DMA_FROM_DEVICE);
1390
1391         isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1392
1393         if (isert_conn->conn) {
1394                 struct iscsi_login *login = isert_conn->conn->conn_login;
1395
1396                 if (login && !login->first_request)
1397                         isert_rx_login_req(isert_conn);
1398         }
1399
1400         mutex_lock(&isert_conn->mutex);
1401         complete(&isert_conn->login_req_comp);
1402         mutex_unlock(&isert_conn->mutex);
1403
1404         ib_dma_sync_single_for_device(ib_dev, isert_conn->login_desc->dma_addr,
1405                                 ISER_RX_SIZE, DMA_FROM_DEVICE);
1406 }
1407
1408 static void
1409 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1410 {
1411         struct se_cmd *se_cmd = &cmd->iscsit_cmd->se_cmd;
1412         enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1413
1414         if (!cmd->rw.nr_ops)
1415                 return;
1416
1417         if (isert_prot_cmd(conn, se_cmd)) {
1418                 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1419                                 conn->cm_id->port_num, se_cmd->t_data_sg,
1420                                 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1421                                 se_cmd->t_prot_nents, dir);
1422         } else {
1423                 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1424                                 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1425         }
1426
1427         cmd->rw.nr_ops = 0;
1428 }
1429
1430 static void
1431 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1432 {
1433         struct iscsit_cmd *cmd = isert_cmd->iscsit_cmd;
1434         struct isert_conn *isert_conn = isert_cmd->conn;
1435         struct iscsit_conn *conn = isert_conn->conn;
1436         struct iscsi_text_rsp *hdr;
1437
1438         isert_dbg("Cmd %p\n", isert_cmd);
1439
1440         switch (cmd->iscsi_opcode) {
1441         case ISCSI_OP_SCSI_CMD:
1442                 spin_lock_bh(&conn->cmd_lock);
1443                 if (!list_empty(&cmd->i_conn_node))
1444                         list_del_init(&cmd->i_conn_node);
1445                 spin_unlock_bh(&conn->cmd_lock);
1446
1447                 if (cmd->data_direction == DMA_TO_DEVICE) {
1448                         iscsit_stop_dataout_timer(cmd);
1449                         /*
1450                          * Check for special case during comp_err where
1451                          * WRITE_PENDING has been handed off from core,
1452                          * but requires an extra target_put_sess_cmd()
1453                          * before transport_generic_free_cmd() below.
1454                          */
1455                         if (comp_err &&
1456                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1457                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1458
1459                                 target_put_sess_cmd(se_cmd);
1460                         }
1461                 }
1462
1463                 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1464                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1465                 break;
1466         case ISCSI_OP_SCSI_TMFUNC:
1467                 spin_lock_bh(&conn->cmd_lock);
1468                 if (!list_empty(&cmd->i_conn_node))
1469                         list_del_init(&cmd->i_conn_node);
1470                 spin_unlock_bh(&conn->cmd_lock);
1471
1472                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1473                 break;
1474         case ISCSI_OP_REJECT:
1475         case ISCSI_OP_NOOP_OUT:
1476         case ISCSI_OP_TEXT:
1477                 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1478                 /* If the continue bit is on, keep the command alive */
1479                 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1480                         break;
1481
1482                 spin_lock_bh(&conn->cmd_lock);
1483                 if (!list_empty(&cmd->i_conn_node))
1484                         list_del_init(&cmd->i_conn_node);
1485                 spin_unlock_bh(&conn->cmd_lock);
1486
1487                 /*
1488                  * Handle special case for REJECT when iscsi_add_reject*() has
1489                  * overwritten the original iscsi_opcode assignment, and the
1490                  * associated cmd->se_cmd needs to be released.
1491                  */
1492                 if (cmd->se_cmd.se_tfo != NULL) {
1493                         isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1494                                  cmd->iscsi_opcode);
1495                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1496                         break;
1497                 }
1498                 fallthrough;
1499         default:
1500                 iscsit_release_cmd(cmd);
1501                 break;
1502         }
1503 }
1504
1505 static void
1506 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1507 {
1508         if (tx_desc->dma_addr != 0) {
1509                 isert_dbg("unmap single for tx_desc->dma_addr\n");
1510                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1511                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1512                 tx_desc->dma_addr = 0;
1513         }
1514 }
1515
1516 static void
1517 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1518                      struct ib_device *ib_dev, bool comp_err)
1519 {
1520         if (isert_cmd->pdu_buf_dma != 0) {
1521                 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1522                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1523                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1524                 isert_cmd->pdu_buf_dma = 0;
1525         }
1526
1527         isert_unmap_tx_desc(tx_desc, ib_dev);
1528         isert_put_cmd(isert_cmd, comp_err);
1529 }
1530
1531 static int
1532 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1533 {
1534         struct ib_mr_status mr_status;
1535         int ret;
1536
1537         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1538         if (ret) {
1539                 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1540                 goto fail_mr_status;
1541         }
1542
1543         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1544                 u64 sec_offset_err;
1545                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1546
1547                 switch (mr_status.sig_err.err_type) {
1548                 case IB_SIG_BAD_GUARD:
1549                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1550                         break;
1551                 case IB_SIG_BAD_REFTAG:
1552                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1553                         break;
1554                 case IB_SIG_BAD_APPTAG:
1555                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1556                         break;
1557                 }
1558                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1559                 do_div(sec_offset_err, block_size);
1560                 se_cmd->sense_info = sec_offset_err + se_cmd->t_task_lba;
1561
1562                 isert_err("PI error found type %d at sector 0x%llx "
1563                           "expected 0x%x vs actual 0x%x\n",
1564                           mr_status.sig_err.err_type,
1565                           (unsigned long long)se_cmd->sense_info,
1566                           mr_status.sig_err.expected,
1567                           mr_status.sig_err.actual);
1568                 ret = 1;
1569         }
1570
1571 fail_mr_status:
1572         return ret;
1573 }
1574
1575 static void
1576 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1577 {
1578         struct isert_conn *isert_conn = wc->qp->qp_context;
1579         struct isert_device *device = isert_conn->device;
1580         struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1581         struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1582         struct se_cmd *cmd = &isert_cmd->iscsit_cmd->se_cmd;
1583         int ret = 0;
1584
1585         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1586                 isert_print_wc(wc, "rdma write");
1587                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1588                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1589                 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1590                 return;
1591         }
1592
1593         isert_dbg("Cmd %p\n", isert_cmd);
1594
1595         ret = isert_check_pi_status(cmd, isert_cmd->rw.reg->mr);
1596         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1597
1598         if (ret) {
1599                 /*
1600                  * transport_generic_request_failure() expects to have
1601                  * plus two references to handle queue-full, so re-add
1602                  * one here as target-core will have already dropped
1603                  * it after the first isert_put_datain() callback.
1604                  */
1605                 kref_get(&cmd->cmd_kref);
1606                 transport_generic_request_failure(cmd, cmd->pi_err);
1607         } else {
1608                 /*
1609                  * XXX: isert_put_response() failure is not retried.
1610                  */
1611                 ret = isert_put_response(isert_conn->conn, isert_cmd->iscsit_cmd);
1612                 if (ret)
1613                         pr_warn_ratelimited("isert_put_response() ret: %d\n", ret);
1614         }
1615 }
1616
1617 static void
1618 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1619 {
1620         struct isert_conn *isert_conn = wc->qp->qp_context;
1621         struct isert_device *device = isert_conn->device;
1622         struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1623         struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1624         struct iscsit_cmd *cmd = isert_cmd->iscsit_cmd;
1625         struct se_cmd *se_cmd = &cmd->se_cmd;
1626         int ret = 0;
1627
1628         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1629                 isert_print_wc(wc, "rdma read");
1630                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1631                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1632                 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1633                 return;
1634         }
1635
1636         isert_dbg("Cmd %p\n", isert_cmd);
1637
1638         iscsit_stop_dataout_timer(cmd);
1639
1640         if (isert_prot_cmd(isert_conn, se_cmd))
1641                 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.reg->mr);
1642         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1643         cmd->write_data_done = 0;
1644
1645         isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1646         spin_lock_bh(&cmd->istate_lock);
1647         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1648         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1649         spin_unlock_bh(&cmd->istate_lock);
1650
1651         /*
1652          * transport_generic_request_failure() will drop the extra
1653          * se_cmd->cmd_kref reference after T10-PI error, and handle
1654          * any non-zero ->queue_status() callback error retries.
1655          */
1656         if (ret)
1657                 transport_generic_request_failure(se_cmd, se_cmd->pi_err);
1658         else
1659                 target_execute_cmd(se_cmd);
1660 }
1661
1662 static void
1663 isert_do_control_comp(struct work_struct *work)
1664 {
1665         struct isert_cmd *isert_cmd = container_of(work,
1666                         struct isert_cmd, comp_work);
1667         struct isert_conn *isert_conn = isert_cmd->conn;
1668         struct ib_device *ib_dev = isert_conn->cm_id->device;
1669         struct iscsit_cmd *cmd = isert_cmd->iscsit_cmd;
1670
1671         isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1672
1673         switch (cmd->i_state) {
1674         case ISTATE_SEND_TASKMGTRSP:
1675                 iscsit_tmr_post_handler(cmd, cmd->conn);
1676                 fallthrough;
1677         case ISTATE_SEND_REJECT:
1678         case ISTATE_SEND_TEXTRSP:
1679                 cmd->i_state = ISTATE_SENT_STATUS;
1680                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1681                                      ib_dev, false);
1682                 break;
1683         case ISTATE_SEND_LOGOUTRSP:
1684                 iscsit_logout_post_handler(cmd, cmd->conn);
1685                 break;
1686         default:
1687                 isert_err("Unknown i_state %d\n", cmd->i_state);
1688                 dump_stack();
1689                 break;
1690         }
1691 }
1692
1693 static void
1694 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1695 {
1696         struct isert_conn *isert_conn = wc->qp->qp_context;
1697         struct ib_device *ib_dev = isert_conn->cm_id->device;
1698         struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1699
1700         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1701                 isert_print_wc(wc, "login send");
1702                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1703                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1704         }
1705
1706         isert_unmap_tx_desc(tx_desc, ib_dev);
1707 }
1708
1709 static void
1710 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1711 {
1712         struct isert_conn *isert_conn = wc->qp->qp_context;
1713         struct ib_device *ib_dev = isert_conn->cm_id->device;
1714         struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1715         struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1716
1717         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1718                 isert_print_wc(wc, "send");
1719                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1720                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1721                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1722                 return;
1723         }
1724
1725         isert_dbg("Cmd %p\n", isert_cmd);
1726
1727         switch (isert_cmd->iscsit_cmd->i_state) {
1728         case ISTATE_SEND_TASKMGTRSP:
1729         case ISTATE_SEND_LOGOUTRSP:
1730         case ISTATE_SEND_REJECT:
1731         case ISTATE_SEND_TEXTRSP:
1732                 isert_unmap_tx_desc(tx_desc, ib_dev);
1733
1734                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1735                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1736                 return;
1737         default:
1738                 isert_cmd->iscsit_cmd->i_state = ISTATE_SENT_STATUS;
1739                 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1740                 break;
1741         }
1742 }
1743
1744 static int
1745 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1746 {
1747         int ret;
1748
1749         ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1750         if (ret)
1751                 return ret;
1752
1753         ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr, NULL);
1754         if (ret) {
1755                 isert_err("ib_post_send failed with %d\n", ret);
1756                 return ret;
1757         }
1758         return ret;
1759 }
1760
1761 static int
1762 isert_put_response(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
1763 {
1764         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1765         struct isert_conn *isert_conn = conn->context;
1766         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1767         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1768                                 &isert_cmd->tx_desc.iscsi_header;
1769
1770         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1771         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1772         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1773         /*
1774          * Attach SENSE DATA payload to iSCSI Response PDU
1775          */
1776         if (cmd->se_cmd.sense_buffer &&
1777             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1778             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1779                 struct isert_device *device = isert_conn->device;
1780                 struct ib_device *ib_dev = device->ib_device;
1781                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1782                 u32 padding, pdu_len;
1783
1784                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1785                                    cmd->sense_buffer);
1786                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1787
1788                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1789                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1790                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1791
1792                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1793                                 (void *)cmd->sense_buffer, pdu_len,
1794                                 DMA_TO_DEVICE);
1795                 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1796                         return -ENOMEM;
1797
1798                 isert_cmd->pdu_buf_len = pdu_len;
1799                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1800                 tx_dsg->length  = pdu_len;
1801                 tx_dsg->lkey    = device->pd->local_dma_lkey;
1802                 isert_cmd->tx_desc.num_sge = 2;
1803         }
1804
1805         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1806
1807         isert_dbg("Posting SCSI Response\n");
1808
1809         return isert_post_response(isert_conn, isert_cmd);
1810 }
1811
1812 static void
1813 isert_aborted_task(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
1814 {
1815         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1816         struct isert_conn *isert_conn = conn->context;
1817
1818         spin_lock_bh(&conn->cmd_lock);
1819         if (!list_empty(&cmd->i_conn_node))
1820                 list_del_init(&cmd->i_conn_node);
1821         spin_unlock_bh(&conn->cmd_lock);
1822
1823         if (cmd->data_direction == DMA_TO_DEVICE)
1824                 iscsit_stop_dataout_timer(cmd);
1825         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1826 }
1827
1828 static enum target_prot_op
1829 isert_get_sup_prot_ops(struct iscsit_conn *conn)
1830 {
1831         struct isert_conn *isert_conn = conn->context;
1832         struct isert_device *device = isert_conn->device;
1833
1834         if (conn->tpg->tpg_attrib.t10_pi) {
1835                 if (device->pi_capable) {
1836                         isert_info("conn %p PI offload enabled\n", isert_conn);
1837                         isert_conn->pi_support = true;
1838                         return TARGET_PROT_ALL;
1839                 }
1840         }
1841
1842         isert_info("conn %p PI offload disabled\n", isert_conn);
1843         isert_conn->pi_support = false;
1844
1845         return TARGET_PROT_NORMAL;
1846 }
1847
1848 static int
1849 isert_put_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
1850                 bool nopout_response)
1851 {
1852         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1853         struct isert_conn *isert_conn = conn->context;
1854         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1855
1856         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1857         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1858                                &isert_cmd->tx_desc.iscsi_header,
1859                                nopout_response);
1860         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1861         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1862
1863         isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1864
1865         return isert_post_response(isert_conn, isert_cmd);
1866 }
1867
1868 static int
1869 isert_put_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1870 {
1871         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1872         struct isert_conn *isert_conn = conn->context;
1873         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1874
1875         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1876         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1877                                 &isert_cmd->tx_desc.iscsi_header);
1878         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1879         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1880
1881         isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1882
1883         return isert_post_response(isert_conn, isert_cmd);
1884 }
1885
1886 static int
1887 isert_put_tm_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1888 {
1889         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1890         struct isert_conn *isert_conn = conn->context;
1891         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1892
1893         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1894         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1895                                   &isert_cmd->tx_desc.iscsi_header);
1896         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1897         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1898
1899         isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1900
1901         return isert_post_response(isert_conn, isert_cmd);
1902 }
1903
1904 static int
1905 isert_put_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1906 {
1907         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1908         struct isert_conn *isert_conn = conn->context;
1909         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1910         struct isert_device *device = isert_conn->device;
1911         struct ib_device *ib_dev = device->ib_device;
1912         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1913         struct iscsi_reject *hdr =
1914                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1915
1916         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1917         iscsit_build_reject(cmd, conn, hdr);
1918         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1919
1920         hton24(hdr->dlength, ISCSI_HDR_LEN);
1921         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1922                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1923                         DMA_TO_DEVICE);
1924         if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1925                 return -ENOMEM;
1926         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1927         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1928         tx_dsg->length  = ISCSI_HDR_LEN;
1929         tx_dsg->lkey    = device->pd->local_dma_lkey;
1930         isert_cmd->tx_desc.num_sge = 2;
1931
1932         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1933
1934         isert_dbg("conn %p Posting Reject\n", isert_conn);
1935
1936         return isert_post_response(isert_conn, isert_cmd);
1937 }
1938
1939 static int
1940 isert_put_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1941 {
1942         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1943         struct isert_conn *isert_conn = conn->context;
1944         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1945         struct iscsi_text_rsp *hdr =
1946                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1947         u32 txt_rsp_len;
1948         int rc;
1949
1950         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1951         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
1952         if (rc < 0)
1953                 return rc;
1954
1955         txt_rsp_len = rc;
1956         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1957
1958         if (txt_rsp_len) {
1959                 struct isert_device *device = isert_conn->device;
1960                 struct ib_device *ib_dev = device->ib_device;
1961                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1962                 void *txt_rsp_buf = cmd->buf_ptr;
1963
1964                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1965                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
1966                 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1967                         return -ENOMEM;
1968
1969                 isert_cmd->pdu_buf_len = txt_rsp_len;
1970                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1971                 tx_dsg->length  = txt_rsp_len;
1972                 tx_dsg->lkey    = device->pd->local_dma_lkey;
1973                 isert_cmd->tx_desc.num_sge = 2;
1974         }
1975         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1976
1977         isert_dbg("conn %p Text Response\n", isert_conn);
1978
1979         return isert_post_response(isert_conn, isert_cmd);
1980 }
1981
1982 static inline void
1983 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_domain *domain)
1984 {
1985         domain->sig_type = IB_SIG_TYPE_T10_DIF;
1986         domain->sig.dif.bg_type = IB_T10DIF_CRC;
1987         domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
1988         domain->sig.dif.ref_tag = se_cmd->reftag_seed;
1989         /*
1990          * At the moment we hard code those, but if in the future
1991          * the target core would like to use it, we will take it
1992          * from se_cmd.
1993          */
1994         domain->sig.dif.apptag_check_mask = 0xffff;
1995         domain->sig.dif.app_escape = true;
1996         domain->sig.dif.ref_escape = true;
1997         if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
1998             se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
1999                 domain->sig.dif.ref_remap = true;
2000 }
2001
2002 static int
2003 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2004 {
2005         memset(sig_attrs, 0, sizeof(*sig_attrs));
2006
2007         switch (se_cmd->prot_op) {
2008         case TARGET_PROT_DIN_INSERT:
2009         case TARGET_PROT_DOUT_STRIP:
2010                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2011                 isert_set_dif_domain(se_cmd, &sig_attrs->wire);
2012                 break;
2013         case TARGET_PROT_DOUT_INSERT:
2014         case TARGET_PROT_DIN_STRIP:
2015                 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2016                 isert_set_dif_domain(se_cmd, &sig_attrs->mem);
2017                 break;
2018         case TARGET_PROT_DIN_PASS:
2019         case TARGET_PROT_DOUT_PASS:
2020                 isert_set_dif_domain(se_cmd, &sig_attrs->wire);
2021                 isert_set_dif_domain(se_cmd, &sig_attrs->mem);
2022                 break;
2023         default:
2024                 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2025                 return -EINVAL;
2026         }
2027
2028         if (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD)
2029                 sig_attrs->check_mask |= IB_SIG_CHECK_GUARD;
2030         if (se_cmd->prot_checks & TARGET_DIF_CHECK_APPTAG)
2031                 sig_attrs->check_mask |= IB_SIG_CHECK_APPTAG;
2032         if (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)
2033                 sig_attrs->check_mask |= IB_SIG_CHECK_REFTAG;
2034
2035         return 0;
2036 }
2037
2038 static int
2039 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2040                 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2041 {
2042         struct se_cmd *se_cmd = &cmd->iscsit_cmd->se_cmd;
2043         enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2044         u8 port_num = conn->cm_id->port_num;
2045         u64 addr;
2046         u32 rkey, offset;
2047         int ret;
2048
2049         if (cmd->ctx_init_done)
2050                 goto rdma_ctx_post;
2051
2052         if (dir == DMA_FROM_DEVICE) {
2053                 addr = cmd->write_va;
2054                 rkey = cmd->write_stag;
2055                 offset = cmd->iscsit_cmd->write_data_done;
2056         } else {
2057                 addr = cmd->read_va;
2058                 rkey = cmd->read_stag;
2059                 offset = 0;
2060         }
2061
2062         if (isert_prot_cmd(conn, se_cmd)) {
2063                 struct ib_sig_attrs sig_attrs;
2064
2065                 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2066                 if (ret)
2067                         return ret;
2068
2069                 WARN_ON_ONCE(offset);
2070                 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2071                                 se_cmd->t_data_sg, se_cmd->t_data_nents,
2072                                 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2073                                 &sig_attrs, addr, rkey, dir);
2074         } else {
2075                 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2076                                 se_cmd->t_data_sg, se_cmd->t_data_nents,
2077                                 offset, addr, rkey, dir);
2078         }
2079
2080         if (ret < 0) {
2081                 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2082                 return ret;
2083         }
2084
2085         cmd->ctx_init_done = true;
2086
2087 rdma_ctx_post:
2088         ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2089         if (ret < 0)
2090                 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2091         return ret;
2092 }
2093
2094 static int
2095 isert_put_datain(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
2096 {
2097         struct se_cmd *se_cmd = &cmd->se_cmd;
2098         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2099         struct isert_conn *isert_conn = conn->context;
2100         struct ib_cqe *cqe = NULL;
2101         struct ib_send_wr *chain_wr = NULL;
2102         int rc;
2103
2104         isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2105                  isert_cmd, se_cmd->data_length);
2106
2107         if (isert_prot_cmd(isert_conn, se_cmd)) {
2108                 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2109                 cqe = &isert_cmd->tx_desc.tx_cqe;
2110         } else {
2111                 /*
2112                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2113                  */
2114                 isert_create_send_desc(isert_conn, isert_cmd,
2115                                        &isert_cmd->tx_desc);
2116                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2117                                      &isert_cmd->tx_desc.iscsi_header);
2118                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2119                 isert_init_send_wr(isert_conn, isert_cmd,
2120                                    &isert_cmd->tx_desc.send_wr);
2121
2122                 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2123                 if (rc)
2124                         return rc;
2125
2126                 chain_wr = &isert_cmd->tx_desc.send_wr;
2127         }
2128
2129         rc = isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2130         isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ rc: %d\n",
2131                   isert_cmd, rc);
2132         return rc;
2133 }
2134
2135 static int
2136 isert_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd, bool recovery)
2137 {
2138         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2139         int ret;
2140
2141         isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2142                  isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2143
2144         isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2145         ret = isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2146                                      &isert_cmd->tx_desc.tx_cqe, NULL);
2147
2148         isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE rc: %d\n",
2149                  isert_cmd, ret);
2150         return ret;
2151 }
2152
2153 static int
2154 isert_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
2155 {
2156         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2157         int ret = 0;
2158
2159         switch (state) {
2160         case ISTATE_REMOVE:
2161                 spin_lock_bh(&conn->cmd_lock);
2162                 list_del_init(&cmd->i_conn_node);
2163                 spin_unlock_bh(&conn->cmd_lock);
2164                 isert_put_cmd(isert_cmd, true);
2165                 break;
2166         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2167                 ret = isert_put_nopin(cmd, conn, false);
2168                 break;
2169         default:
2170                 isert_err("Unknown immediate state: 0x%02x\n", state);
2171                 ret = -EINVAL;
2172                 break;
2173         }
2174
2175         return ret;
2176 }
2177
2178 static int
2179 isert_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
2180 {
2181         struct isert_conn *isert_conn = conn->context;
2182         int ret;
2183
2184         switch (state) {
2185         case ISTATE_SEND_LOGOUTRSP:
2186                 ret = isert_put_logout_rsp(cmd, conn);
2187                 if (!ret)
2188                         isert_conn->logout_posted = true;
2189                 break;
2190         case ISTATE_SEND_NOPIN:
2191                 ret = isert_put_nopin(cmd, conn, true);
2192                 break;
2193         case ISTATE_SEND_TASKMGTRSP:
2194                 ret = isert_put_tm_rsp(cmd, conn);
2195                 break;
2196         case ISTATE_SEND_REJECT:
2197                 ret = isert_put_reject(cmd, conn);
2198                 break;
2199         case ISTATE_SEND_TEXTRSP:
2200                 ret = isert_put_text_rsp(cmd, conn);
2201                 break;
2202         case ISTATE_SEND_STATUS:
2203                 /*
2204                  * Special case for sending non GOOD SCSI status from TX thread
2205                  * context during pre se_cmd excecution failure.
2206                  */
2207                 ret = isert_put_response(conn, cmd);
2208                 break;
2209         default:
2210                 isert_err("Unknown response state: 0x%02x\n", state);
2211                 ret = -EINVAL;
2212                 break;
2213         }
2214
2215         return ret;
2216 }
2217
2218 struct rdma_cm_id *
2219 isert_setup_id(struct isert_np *isert_np)
2220 {
2221         struct iscsi_np *np = isert_np->np;
2222         struct rdma_cm_id *id;
2223         struct sockaddr *sa;
2224         int ret;
2225
2226         sa = (struct sockaddr *)&np->np_sockaddr;
2227         isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2228
2229         id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2230                             RDMA_PS_TCP, IB_QPT_RC);
2231         if (IS_ERR(id)) {
2232                 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2233                 ret = PTR_ERR(id);
2234                 goto out;
2235         }
2236         isert_dbg("id %p context %p\n", id, id->context);
2237
2238         /*
2239          * Allow both IPv4 and IPv6 sockets to bind a single port
2240          * at the same time.
2241          */
2242         ret = rdma_set_afonly(id, 1);
2243         if (ret) {
2244                 isert_err("rdma_set_afonly() failed: %d\n", ret);
2245                 goto out_id;
2246         }
2247
2248         ret = rdma_bind_addr(id, sa);
2249         if (ret) {
2250                 isert_err("rdma_bind_addr() failed: %d\n", ret);
2251                 goto out_id;
2252         }
2253
2254         ret = rdma_listen(id, 0);
2255         if (ret) {
2256                 isert_err("rdma_listen() failed: %d\n", ret);
2257                 goto out_id;
2258         }
2259
2260         return id;
2261 out_id:
2262         rdma_destroy_id(id);
2263 out:
2264         return ERR_PTR(ret);
2265 }
2266
2267 static int
2268 isert_setup_np(struct iscsi_np *np,
2269                struct sockaddr_storage *ksockaddr)
2270 {
2271         struct isert_np *isert_np;
2272         struct rdma_cm_id *isert_lid;
2273         int ret;
2274
2275         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2276         if (!isert_np)
2277                 return -ENOMEM;
2278
2279         sema_init(&isert_np->sem, 0);
2280         mutex_init(&isert_np->mutex);
2281         INIT_LIST_HEAD(&isert_np->accepted);
2282         INIT_LIST_HEAD(&isert_np->pending);
2283         isert_np->np = np;
2284
2285         /*
2286          * Setup the np->np_sockaddr from the passed sockaddr setup
2287          * in iscsi_target_configfs.c code..
2288          */
2289         memcpy(&np->np_sockaddr, ksockaddr,
2290                sizeof(struct sockaddr_storage));
2291
2292         isert_lid = isert_setup_id(isert_np);
2293         if (IS_ERR(isert_lid)) {
2294                 ret = PTR_ERR(isert_lid);
2295                 goto out;
2296         }
2297
2298         isert_np->cm_id = isert_lid;
2299         np->np_context = isert_np;
2300
2301         return 0;
2302
2303 out:
2304         kfree(isert_np);
2305
2306         return ret;
2307 }
2308
2309 static int
2310 isert_rdma_accept(struct isert_conn *isert_conn)
2311 {
2312         struct rdma_cm_id *cm_id = isert_conn->cm_id;
2313         struct rdma_conn_param cp;
2314         int ret;
2315         struct iser_cm_hdr rsp_hdr;
2316
2317         memset(&cp, 0, sizeof(struct rdma_conn_param));
2318         cp.initiator_depth = isert_conn->initiator_depth;
2319         cp.retry_count = 7;
2320         cp.rnr_retry_count = 7;
2321
2322         memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2323         rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2324         if (!isert_conn->snd_w_inv)
2325                 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2326         cp.private_data = (void *)&rsp_hdr;
2327         cp.private_data_len = sizeof(rsp_hdr);
2328
2329         ret = rdma_accept(cm_id, &cp);
2330         if (ret) {
2331                 isert_err("rdma_accept() failed with: %d\n", ret);
2332                 return ret;
2333         }
2334
2335         return 0;
2336 }
2337
2338 static int
2339 isert_get_login_rx(struct iscsit_conn *conn, struct iscsi_login *login)
2340 {
2341         struct isert_conn *isert_conn = conn->context;
2342         int ret;
2343
2344         isert_info("before login_req comp conn: %p\n", isert_conn);
2345         ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2346         if (ret) {
2347                 isert_err("isert_conn %p interrupted before got login req\n",
2348                           isert_conn);
2349                 return ret;
2350         }
2351         reinit_completion(&isert_conn->login_req_comp);
2352
2353         /*
2354          * For login requests after the first PDU, isert_rx_login_req() will
2355          * kick queue_delayed_work(isert_login_wq, &conn->login_work) as
2356          * the packet is received, which turns this callback from
2357          * iscsi_target_do_login_rx() into a NOP.
2358          */
2359         if (!login->first_request)
2360                 return 0;
2361
2362         isert_rx_login_req(isert_conn);
2363
2364         isert_info("before login_comp conn: %p\n", conn);
2365         ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2366         if (ret)
2367                 return ret;
2368
2369         isert_info("processing login->req: %p\n", login->req);
2370
2371         return 0;
2372 }
2373
2374 static void
2375 isert_set_conn_info(struct iscsi_np *np, struct iscsit_conn *conn,
2376                     struct isert_conn *isert_conn)
2377 {
2378         struct rdma_cm_id *cm_id = isert_conn->cm_id;
2379         struct rdma_route *cm_route = &cm_id->route;
2380
2381         conn->login_family = np->np_sockaddr.ss_family;
2382
2383         conn->login_sockaddr = cm_route->addr.dst_addr;
2384         conn->local_sockaddr = cm_route->addr.src_addr;
2385 }
2386
2387 static int
2388 isert_accept_np(struct iscsi_np *np, struct iscsit_conn *conn)
2389 {
2390         struct isert_np *isert_np = np->np_context;
2391         struct isert_conn *isert_conn;
2392         int ret;
2393
2394 accept_wait:
2395         ret = down_interruptible(&isert_np->sem);
2396         if (ret)
2397                 return -ENODEV;
2398
2399         spin_lock_bh(&np->np_thread_lock);
2400         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2401                 spin_unlock_bh(&np->np_thread_lock);
2402                 isert_dbg("np_thread_state %d\n",
2403                          np->np_thread_state);
2404                 /*
2405                  * No point in stalling here when np_thread
2406                  * is in state RESET/SHUTDOWN/EXIT - bail
2407                  */
2408                 return -ENODEV;
2409         }
2410         spin_unlock_bh(&np->np_thread_lock);
2411
2412         mutex_lock(&isert_np->mutex);
2413         if (list_empty(&isert_np->pending)) {
2414                 mutex_unlock(&isert_np->mutex);
2415                 goto accept_wait;
2416         }
2417         isert_conn = list_first_entry(&isert_np->pending,
2418                         struct isert_conn, node);
2419         list_del_init(&isert_conn->node);
2420         mutex_unlock(&isert_np->mutex);
2421
2422         conn->context = isert_conn;
2423         isert_conn->conn = conn;
2424         isert_conn->state = ISER_CONN_BOUND;
2425
2426         isert_set_conn_info(np, conn, isert_conn);
2427
2428         isert_dbg("Processing isert_conn: %p\n", isert_conn);
2429
2430         return 0;
2431 }
2432
2433 static void
2434 isert_free_np(struct iscsi_np *np)
2435 {
2436         struct isert_np *isert_np = np->np_context;
2437         struct isert_conn *isert_conn, *n;
2438         LIST_HEAD(drop_conn_list);
2439
2440         if (isert_np->cm_id)
2441                 rdma_destroy_id(isert_np->cm_id);
2442
2443         /*
2444          * FIXME: At this point we don't have a good way to insure
2445          * that at this point we don't have hanging connections that
2446          * completed RDMA establishment but didn't start iscsi login
2447          * process. So work-around this by cleaning up what ever piled
2448          * up in accepted and pending lists.
2449          */
2450         mutex_lock(&isert_np->mutex);
2451         if (!list_empty(&isert_np->pending)) {
2452                 isert_info("Still have isert pending connections\n");
2453                 list_for_each_entry_safe(isert_conn, n,
2454                                          &isert_np->pending,
2455                                          node) {
2456                         isert_info("cleaning isert_conn %p state (%d)\n",
2457                                    isert_conn, isert_conn->state);
2458                         list_move_tail(&isert_conn->node, &drop_conn_list);
2459                 }
2460         }
2461
2462         if (!list_empty(&isert_np->accepted)) {
2463                 isert_info("Still have isert accepted connections\n");
2464                 list_for_each_entry_safe(isert_conn, n,
2465                                          &isert_np->accepted,
2466                                          node) {
2467                         isert_info("cleaning isert_conn %p state (%d)\n",
2468                                    isert_conn, isert_conn->state);
2469                         list_move_tail(&isert_conn->node, &drop_conn_list);
2470                 }
2471         }
2472         mutex_unlock(&isert_np->mutex);
2473
2474         list_for_each_entry_safe(isert_conn, n, &drop_conn_list, node) {
2475                 list_del_init(&isert_conn->node);
2476                 isert_connect_release(isert_conn);
2477         }
2478
2479         np->np_context = NULL;
2480         kfree(isert_np);
2481 }
2482
2483 static void isert_release_work(struct work_struct *work)
2484 {
2485         struct isert_conn *isert_conn = container_of(work,
2486                                                      struct isert_conn,
2487                                                      release_work);
2488
2489         isert_info("Starting release conn %p\n", isert_conn);
2490
2491         mutex_lock(&isert_conn->mutex);
2492         isert_conn->state = ISER_CONN_DOWN;
2493         mutex_unlock(&isert_conn->mutex);
2494
2495         isert_info("Destroying conn %p\n", isert_conn);
2496         isert_put_conn(isert_conn);
2497 }
2498
2499 static void
2500 isert_wait4logout(struct isert_conn *isert_conn)
2501 {
2502         struct iscsit_conn *conn = isert_conn->conn;
2503
2504         isert_info("conn %p\n", isert_conn);
2505
2506         if (isert_conn->logout_posted) {
2507                 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2508                 wait_for_completion_timeout(&conn->conn_logout_comp,
2509                                             SECONDS_FOR_LOGOUT_COMP * HZ);
2510         }
2511 }
2512
2513 static void
2514 isert_wait4cmds(struct iscsit_conn *conn)
2515 {
2516         isert_info("iscsit_conn %p\n", conn);
2517
2518         if (conn->sess) {
2519                 target_stop_cmd_counter(conn->cmd_cnt);
2520                 target_wait_for_cmds(conn->cmd_cnt);
2521         }
2522 }
2523
2524 /**
2525  * isert_put_unsol_pending_cmds() - Drop commands waiting for
2526  *     unsolicitate dataout
2527  * @conn:    iscsi connection
2528  *
2529  * We might still have commands that are waiting for unsolicited
2530  * dataouts messages. We must put the extra reference on those
2531  * before blocking on the target_wait_for_session_cmds
2532  */
2533 static void
2534 isert_put_unsol_pending_cmds(struct iscsit_conn *conn)
2535 {
2536         struct iscsit_cmd *cmd, *tmp;
2537         static LIST_HEAD(drop_cmd_list);
2538
2539         spin_lock_bh(&conn->cmd_lock);
2540         list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2541                 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2542                     (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2543                     (cmd->write_data_done < cmd->se_cmd.data_length))
2544                         list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2545         }
2546         spin_unlock_bh(&conn->cmd_lock);
2547
2548         list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2549                 list_del_init(&cmd->i_conn_node);
2550                 if (cmd->i_state != ISTATE_REMOVE) {
2551                         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2552
2553                         isert_info("conn %p dropping cmd %p\n", conn, cmd);
2554                         isert_put_cmd(isert_cmd, true);
2555                 }
2556         }
2557 }
2558
2559 static void isert_wait_conn(struct iscsit_conn *conn)
2560 {
2561         struct isert_conn *isert_conn = conn->context;
2562
2563         isert_info("Starting conn %p\n", isert_conn);
2564
2565         mutex_lock(&isert_conn->mutex);
2566         isert_conn_terminate(isert_conn);
2567         mutex_unlock(&isert_conn->mutex);
2568
2569         ib_drain_qp(isert_conn->qp);
2570         isert_put_unsol_pending_cmds(conn);
2571         isert_wait4cmds(conn);
2572         isert_wait4logout(isert_conn);
2573
2574         queue_work(isert_release_wq, &isert_conn->release_work);
2575 }
2576
2577 static void isert_free_conn(struct iscsit_conn *conn)
2578 {
2579         struct isert_conn *isert_conn = conn->context;
2580
2581         ib_drain_qp(isert_conn->qp);
2582         isert_put_conn(isert_conn);
2583 }
2584
2585 static void isert_get_rx_pdu(struct iscsit_conn *conn)
2586 {
2587         struct completion comp;
2588
2589         init_completion(&comp);
2590
2591         wait_for_completion_interruptible(&comp);
2592 }
2593
2594 static struct iscsit_transport iser_target_transport = {
2595         .name                   = "IB/iSER",
2596         .transport_type         = ISCSI_INFINIBAND,
2597         .rdma_shutdown          = true,
2598         .priv_size              = sizeof(struct isert_cmd),
2599         .owner                  = THIS_MODULE,
2600         .iscsit_setup_np        = isert_setup_np,
2601         .iscsit_accept_np       = isert_accept_np,
2602         .iscsit_free_np         = isert_free_np,
2603         .iscsit_wait_conn       = isert_wait_conn,
2604         .iscsit_free_conn       = isert_free_conn,
2605         .iscsit_get_login_rx    = isert_get_login_rx,
2606         .iscsit_put_login_tx    = isert_put_login_tx,
2607         .iscsit_immediate_queue = isert_immediate_queue,
2608         .iscsit_response_queue  = isert_response_queue,
2609         .iscsit_get_dataout     = isert_get_dataout,
2610         .iscsit_queue_data_in   = isert_put_datain,
2611         .iscsit_queue_status    = isert_put_response,
2612         .iscsit_aborted_task    = isert_aborted_task,
2613         .iscsit_get_rx_pdu      = isert_get_rx_pdu,
2614         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2615 };
2616
2617 static int __init isert_init(void)
2618 {
2619         isert_login_wq = alloc_workqueue("isert_login_wq", 0, 0);
2620         if (!isert_login_wq) {
2621                 isert_err("Unable to allocate isert_login_wq\n");
2622                 return -ENOMEM;
2623         }
2624
2625         isert_comp_wq = alloc_workqueue("isert_comp_wq",
2626                                         WQ_UNBOUND | WQ_HIGHPRI, 0);
2627         if (!isert_comp_wq) {
2628                 isert_err("Unable to allocate isert_comp_wq\n");
2629                 goto destroy_login_wq;
2630         }
2631
2632         isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2633                                         WQ_UNBOUND_MAX_ACTIVE);
2634         if (!isert_release_wq) {
2635                 isert_err("Unable to allocate isert_release_wq\n");
2636                 goto destroy_comp_wq;
2637         }
2638
2639         iscsit_register_transport(&iser_target_transport);
2640         isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2641
2642         return 0;
2643
2644 destroy_comp_wq:
2645         destroy_workqueue(isert_comp_wq);
2646 destroy_login_wq:
2647         destroy_workqueue(isert_login_wq);
2648
2649         return -ENOMEM;
2650 }
2651
2652 static void __exit isert_exit(void)
2653 {
2654         flush_workqueue(isert_login_wq);
2655         destroy_workqueue(isert_release_wq);
2656         destroy_workqueue(isert_comp_wq);
2657         iscsit_unregister_transport(&iser_target_transport);
2658         isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2659         destroy_workqueue(isert_login_wq);
2660 }
2661
2662 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2663 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2664 MODULE_LICENSE("GPL");
2665
2666 module_init(isert_init);
2667 module_exit(isert_exit);