drivers/infiniband/ulp/isert/ib_isert.c

   1 /*******************************************************************************
   2  * This file contains iSCSI extentions for RDMA (iSER) Verbs
   3  *
   4  * (c) Copyright 2013 Datera, Inc.
   5  *
   6  * Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ****************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/module.h>
  21 #include <linux/scatterlist.h>
  22 #include <linux/socket.h>
  23 #include <linux/in.h>
  24 #include <linux/in6.h>
  25 #include <rdma/ib_verbs.h>
  26 #include <rdma/rdma_cm.h>
  27 #include <target/target_core_base.h>
  28 #include <target/target_core_fabric.h>
  29 #include <target/iscsi/iscsi_transport.h>
  30 #include <linux/semaphore.h>
  31
  32 #include "ib_isert.h"
  33
  34 #define ISERT_MAX_CONN          8
  35 #define ISER_MAX_RX_CQ_LEN      (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
  36 #define ISER_MAX_TX_CQ_LEN \
  37         ((ISERT_QP_MAX_REQ_DTOS + ISCSI_DEF_XMIT_CMDS_MAX) * ISERT_MAX_CONN)
  38 #define ISER_MAX_CQ_LEN         (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \
  39                                  ISERT_MAX_CONN)
  40
  41 static int isert_debug_level;
  42 module_param_named(debug_level, isert_debug_level, int, 0644);
  43 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
  44
  45 static DEFINE_MUTEX(device_list_mutex);
  46 static LIST_HEAD(device_list);
  47 static struct workqueue_struct *isert_comp_wq;
  48 static struct workqueue_struct *isert_release_wq;
  49
  50 static int
  51 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
  52 static int
  53 isert_login_post_recv(struct isert_conn *isert_conn);
  54 static int
  55 isert_rdma_accept(struct isert_conn *isert_conn);
  56 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
  57
  58 static void isert_release_work(struct work_struct *work);
  59 static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc);
  60 static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
  61 static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
  62 static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc);
  63
  64 static inline bool
  65 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
  66 {
  67         return (conn->pi_support &&
  68                 cmd->prot_op != TARGET_PROT_NORMAL);
  69 }
  70
  71
  72 static void
  73 isert_qp_event_callback(struct ib_event *e, void *context)
  74 {
  75         struct isert_conn *isert_conn = context;
  76
  77         isert_err("%s (%d): conn %p\n",
  78                   ib_event_msg(e->event), e->event, isert_conn);
  79
  80         switch (e->event) {
  81         case IB_EVENT_COMM_EST:
  82                 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
  83                 break;
  84         case IB_EVENT_QP_LAST_WQE_REACHED:
  85                 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
  86                 break;
  87         default:
  88                 break;
  89         }
  90 }
  91
  92 static struct isert_comp *
  93 isert_comp_get(struct isert_conn *isert_conn)
  94 {
  95         struct isert_device *device = isert_conn->device;
  96         struct isert_comp *comp;
  97         int i, min = 0;
  98
  99         mutex_lock(&device_list_mutex);
 100         for (i = 0; i < device->comps_used; i++)
 101                 if (device->comps[i].active_qps <
 102                     device->comps[min].active_qps)
 103                         min = i;
 104         comp = &device->comps[min];
 105         comp->active_qps++;
 106         mutex_unlock(&device_list_mutex);
 107
 108         isert_info("conn %p, using comp %p min_index: %d\n",
 109                    isert_conn, comp, min);
 110
 111         return comp;
 112 }
 113
 114 static void
 115 isert_comp_put(struct isert_comp *comp)
 116 {
 117         mutex_lock(&device_list_mutex);
 118         comp->active_qps--;
 119         mutex_unlock(&device_list_mutex);
 120 }
 121
 122 static struct ib_qp *
 123 isert_create_qp(struct isert_conn *isert_conn,
 124                 struct isert_comp *comp,
 125                 struct rdma_cm_id *cma_id)
 126 {
 127         struct isert_device *device = isert_conn->device;
 128         struct ib_qp_init_attr attr;
 129         int ret;
 130
 131         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 132         attr.event_handler = isert_qp_event_callback;
 133         attr.qp_context = isert_conn;
 134         attr.send_cq = comp->cq;
 135         attr.recv_cq = comp->cq;
 136         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1;
 137         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
 138         attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX;
 139         attr.cap.max_send_sge = device->ib_device->attrs.max_sge;
 140         attr.cap.max_recv_sge = 1;
 141         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 142         attr.qp_type = IB_QPT_RC;
 143         if (device->pi_capable)
 144                 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
 145
 146         ret = rdma_create_qp(cma_id, device->pd, &attr);
 147         if (ret) {
 148                 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
 149                 return ERR_PTR(ret);
 150         }
 151
 152         return cma_id->qp;
 153 }
 154
 155 static int
 156 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
 157 {
 158         struct isert_comp *comp;
 159         int ret;
 160
 161         comp = isert_comp_get(isert_conn);
 162         isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
 163         if (IS_ERR(isert_conn->qp)) {
 164                 ret = PTR_ERR(isert_conn->qp);
 165                 goto err;
 166         }
 167
 168         return 0;
 169 err:
 170         isert_comp_put(comp);
 171         return ret;
 172 }
 173
 174 static int
 175 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 176 {
 177         struct isert_device *device = isert_conn->device;
 178         struct ib_device *ib_dev = device->ib_device;
 179         struct iser_rx_desc *rx_desc;
 180         struct ib_sge *rx_sg;
 181         u64 dma_addr;
 182         int i, j;
 183
 184         isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 185                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 186         if (!isert_conn->rx_descs)
 187                 goto fail;
 188
 189         rx_desc = isert_conn->rx_descs;
 190
 191         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 192                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 193                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 194                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 195                         goto dma_map_fail;
 196
 197                 rx_desc->dma_addr = dma_addr;
 198
 199                 rx_sg = &rx_desc->rx_sg;
 200                 rx_sg->addr = rx_desc->dma_addr;
 201                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 202                 rx_sg->lkey = device->pd->local_dma_lkey;
 203                 rx_desc->rx_cqe.done = isert_recv_done;
 204         }
 205
 206         return 0;
 207
 208 dma_map_fail:
 209         rx_desc = isert_conn->rx_descs;
 210         for (j = 0; j < i; j++, rx_desc++) {
 211                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 212                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 213         }
 214         kfree(isert_conn->rx_descs);
 215         isert_conn->rx_descs = NULL;
 216 fail:
 217         isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
 218
 219         return -ENOMEM;
 220 }
 221
 222 static void
 223 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 224 {
 225         struct ib_device *ib_dev = isert_conn->device->ib_device;
 226         struct iser_rx_desc *rx_desc;
 227         int i;
 228
 229         if (!isert_conn->rx_descs)
 230                 return;
 231
 232         rx_desc = isert_conn->rx_descs;
 233         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 234                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 235                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 236         }
 237
 238         kfree(isert_conn->rx_descs);
 239         isert_conn->rx_descs = NULL;
 240 }
 241
 242 static void
 243 isert_free_comps(struct isert_device *device)
 244 {
 245         int i;
 246
 247         for (i = 0; i < device->comps_used; i++) {
 248                 struct isert_comp *comp = &device->comps[i];
 249
 250                 if (comp->cq)
 251                         ib_free_cq(comp->cq);
 252         }
 253         kfree(device->comps);
 254 }
 255
 256 static int
 257 isert_alloc_comps(struct isert_device *device)
 258 {
 259         int i, max_cqe, ret = 0;
 260
 261         device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
 262                                  device->ib_device->num_comp_vectors));
 263
 264         isert_info("Using %d CQs, %s supports %d vectors support "
 265                    "pi_capable %d\n",
 266                    device->comps_used, device->ib_device->name,
 267                    device->ib_device->num_comp_vectors,
 268                    device->pi_capable);
 269
 270         device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
 271                                 GFP_KERNEL);
 272         if (!device->comps) {
 273                 isert_err("Unable to allocate completion contexts\n");
 274                 return -ENOMEM;
 275         }
 276
 277         max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
 278
 279         for (i = 0; i < device->comps_used; i++) {
 280                 struct isert_comp *comp = &device->comps[i];
 281
 282                 comp->device = device;
 283                 comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i,
 284                                 IB_POLL_WORKQUEUE);
 285                 if (IS_ERR(comp->cq)) {
 286                         isert_err("Unable to allocate cq\n");
 287                         ret = PTR_ERR(comp->cq);
 288                         comp->cq = NULL;
 289                         goto out_cq;
 290                 }
 291         }
 292
 293         return 0;
 294 out_cq:
 295         isert_free_comps(device);
 296         return ret;
 297 }
 298
 299 static int
 300 isert_create_device_ib_res(struct isert_device *device)
 301 {
 302         struct ib_device *ib_dev = device->ib_device;
 303         int ret;
 304
 305         isert_dbg("devattr->max_sge: %d\n", ib_dev->attrs.max_sge);
 306         isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
 307
 308         ret = isert_alloc_comps(device);
 309         if (ret)
 310                 goto out;
 311
 312         device->pd = ib_alloc_pd(ib_dev, 0);
 313         if (IS_ERR(device->pd)) {
 314                 ret = PTR_ERR(device->pd);
 315                 isert_err("failed to allocate pd, device %p, ret=%d\n",
 316                           device, ret);
 317                 goto out_cq;
 318         }
 319
 320         /* Check signature cap */
 321         device->pi_capable = ib_dev->attrs.device_cap_flags &
 322                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 323
 324         return 0;
 325
 326 out_cq:
 327         isert_free_comps(device);
 328 out:
 329         if (ret > 0)
 330                 ret = -EINVAL;
 331         return ret;
 332 }
 333
 334 static void
 335 isert_free_device_ib_res(struct isert_device *device)
 336 {
 337         isert_info("device %p\n", device);
 338
 339         ib_dealloc_pd(device->pd);
 340         isert_free_comps(device);
 341 }
 342
 343 static void
 344 isert_device_put(struct isert_device *device)
 345 {
 346         mutex_lock(&device_list_mutex);
 347         device->refcount--;
 348         isert_info("device %p refcount %d\n", device, device->refcount);
 349         if (!device->refcount) {
 350                 isert_free_device_ib_res(device);
 351                 list_del(&device->dev_node);
 352                 kfree(device);
 353         }
 354         mutex_unlock(&device_list_mutex);
 355 }
 356
 357 static struct isert_device *
 358 isert_device_get(struct rdma_cm_id *cma_id)
 359 {
 360         struct isert_device *device;
 361         int ret;
 362
 363         mutex_lock(&device_list_mutex);
 364         list_for_each_entry(device, &device_list, dev_node) {
 365                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 366                         device->refcount++;
 367                         isert_info("Found iser device %p refcount %d\n",
 368                                    device, device->refcount);
 369                         mutex_unlock(&device_list_mutex);
 370                         return device;
 371                 }
 372         }
 373
 374         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 375         if (!device) {
 376                 mutex_unlock(&device_list_mutex);
 377                 return ERR_PTR(-ENOMEM);
 378         }
 379
 380         INIT_LIST_HEAD(&device->dev_node);
 381
 382         device->ib_device = cma_id->device;
 383         ret = isert_create_device_ib_res(device);
 384         if (ret) {
 385                 kfree(device);
 386                 mutex_unlock(&device_list_mutex);
 387                 return ERR_PTR(ret);
 388         }
 389
 390         device->refcount++;
 391         list_add_tail(&device->dev_node, &device_list);
 392         isert_info("Created a new iser device %p refcount %d\n",
 393                    device, device->refcount);
 394         mutex_unlock(&device_list_mutex);
 395
 396         return device;
 397 }
 398
 399 static void
 400 isert_init_conn(struct isert_conn *isert_conn)
 401 {
 402         isert_conn->state = ISER_CONN_INIT;
 403         INIT_LIST_HEAD(&isert_conn->node);
 404         init_completion(&isert_conn->login_comp);
 405         init_completion(&isert_conn->login_req_comp);
 406         kref_init(&isert_conn->kref);
 407         mutex_init(&isert_conn->mutex);
 408         INIT_WORK(&isert_conn->release_work, isert_release_work);
 409 }
 410
 411 static void
 412 isert_free_login_buf(struct isert_conn *isert_conn)
 413 {
 414         struct ib_device *ib_dev = isert_conn->device->ib_device;
 415
 416         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 417                             ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
 418         kfree(isert_conn->login_rsp_buf);
 419
 420         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 421                             ISER_RX_PAYLOAD_SIZE,
 422                             DMA_FROM_DEVICE);
 423         kfree(isert_conn->login_req_buf);
 424 }
 425
 426 static int
 427 isert_alloc_login_buf(struct isert_conn *isert_conn,
 428                       struct ib_device *ib_dev)
 429 {
 430         int ret;
 431
 432         isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
 433                         GFP_KERNEL);
 434         if (!isert_conn->login_req_buf) {
 435                 isert_err("Unable to allocate isert_conn->login_buf\n");
 436                 return -ENOMEM;
 437         }
 438
 439         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 440                                 isert_conn->login_req_buf,
 441                                 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 442         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 443         if (ret) {
 444                 isert_err("login_req_dma mapping error: %d\n", ret);
 445                 isert_conn->login_req_dma = 0;
 446                 goto out_free_login_req_buf;
 447         }
 448
 449         isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
 450         if (!isert_conn->login_rsp_buf) {
 451                 isert_err("Unable to allocate isert_conn->login_rspbuf\n");
 452                 goto out_unmap_login_req_buf;
 453         }
 454
 455         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 456                                         isert_conn->login_rsp_buf,
 457                                         ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
 458         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 459         if (ret) {
 460                 isert_err("login_rsp_dma mapping error: %d\n", ret);
 461                 isert_conn->login_rsp_dma = 0;
 462                 goto out_free_login_rsp_buf;
 463         }
 464
 465         return 0;
 466
 467 out_free_login_rsp_buf:
 468         kfree(isert_conn->login_rsp_buf);
 469 out_unmap_login_req_buf:
 470         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 471                             ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 472 out_free_login_req_buf:
 473         kfree(isert_conn->login_req_buf);
 474         return ret;
 475 }
 476
 477 static void
 478 isert_set_nego_params(struct isert_conn *isert_conn,
 479                       struct rdma_conn_param *param)
 480 {
 481         struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
 482
 483         /* Set max inflight RDMA READ requests */
 484         isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
 485                                 attr->max_qp_init_rd_atom);
 486         isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
 487
 488         if (param->private_data) {
 489                 u8 flags = *(u8 *)param->private_data;
 490
 491                 /*
 492                  * use remote invalidation if the both initiator
 493                  * and the HCA support it
 494                  */
 495                 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
 496                                           (attr->device_cap_flags &
 497                                            IB_DEVICE_MEM_MGT_EXTENSIONS);
 498                 if (isert_conn->snd_w_inv)
 499                         isert_info("Using remote invalidation\n");
 500         }
 501 }
 502
 503 static int
 504 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 505 {
 506         struct isert_np *isert_np = cma_id->context;
 507         struct iscsi_np *np = isert_np->np;
 508         struct isert_conn *isert_conn;
 509         struct isert_device *device;
 510         int ret = 0;
 511
 512         spin_lock_bh(&np->np_thread_lock);
 513         if (!np->enabled) {
 514                 spin_unlock_bh(&np->np_thread_lock);
 515                 isert_dbg("iscsi_np is not enabled, reject connect request\n");
 516                 return rdma_reject(cma_id, NULL, 0);
 517         }
 518         spin_unlock_bh(&np->np_thread_lock);
 519
 520         isert_dbg("cma_id: %p, portal: %p\n",
 521                  cma_id, cma_id->context);
 522
 523         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 524         if (!isert_conn)
 525                 return -ENOMEM;
 526
 527         isert_init_conn(isert_conn);
 528         isert_conn->cm_id = cma_id;
 529
 530         ret = isert_alloc_login_buf(isert_conn, cma_id->device);
 531         if (ret)
 532                 goto out;
 533
 534         device = isert_device_get(cma_id);
 535         if (IS_ERR(device)) {
 536                 ret = PTR_ERR(device);
 537                 goto out_rsp_dma_map;
 538         }
 539         isert_conn->device = device;
 540
 541         isert_set_nego_params(isert_conn, &event->param.conn);
 542
 543         ret = isert_conn_setup_qp(isert_conn, cma_id);
 544         if (ret)
 545                 goto out_conn_dev;
 546
 547         ret = isert_login_post_recv(isert_conn);
 548         if (ret)
 549                 goto out_conn_dev;
 550
 551         ret = isert_rdma_accept(isert_conn);
 552         if (ret)
 553                 goto out_conn_dev;
 554
 555         mutex_lock(&isert_np->mutex);
 556         list_add_tail(&isert_conn->node, &isert_np->accepted);
 557         mutex_unlock(&isert_np->mutex);
 558
 559         return 0;
 560
 561 out_conn_dev:
 562         isert_device_put(device);
 563 out_rsp_dma_map:
 564         isert_free_login_buf(isert_conn);
 565 out:
 566         kfree(isert_conn);
 567         rdma_reject(cma_id, NULL, 0);
 568         return ret;
 569 }
 570
 571 static void
 572 isert_connect_release(struct isert_conn *isert_conn)
 573 {
 574         struct isert_device *device = isert_conn->device;
 575
 576         isert_dbg("conn %p\n", isert_conn);
 577
 578         BUG_ON(!device);
 579
 580         isert_free_rx_descriptors(isert_conn);
 581         if (isert_conn->cm_id)
 582                 rdma_destroy_id(isert_conn->cm_id);
 583
 584         if (isert_conn->qp) {
 585                 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
 586
 587                 isert_comp_put(comp);
 588                 ib_destroy_qp(isert_conn->qp);
 589         }
 590
 591         if (isert_conn->login_req_buf)
 592                 isert_free_login_buf(isert_conn);
 593
 594         isert_device_put(device);
 595
 596         kfree(isert_conn);
 597 }
 598
 599 static void
 600 isert_connected_handler(struct rdma_cm_id *cma_id)
 601 {
 602         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 603         struct isert_np *isert_np = cma_id->context;
 604
 605         isert_info("conn %p\n", isert_conn);
 606
 607         mutex_lock(&isert_conn->mutex);
 608         isert_conn->state = ISER_CONN_UP;
 609         kref_get(&isert_conn->kref);
 610         mutex_unlock(&isert_conn->mutex);
 611
 612         mutex_lock(&isert_np->mutex);
 613         list_move_tail(&isert_conn->node, &isert_np->pending);
 614         mutex_unlock(&isert_np->mutex);
 615
 616         isert_info("np %p: Allow accept_np to continue\n", isert_np);
 617         up(&isert_np->sem);
 618 }
 619
 620 static void
 621 isert_release_kref(struct kref *kref)
 622 {
 623         struct isert_conn *isert_conn = container_of(kref,
 624                                 struct isert_conn, kref);
 625
 626         isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
 627                    current->pid);
 628
 629         isert_connect_release(isert_conn);
 630 }
 631
 632 static void
 633 isert_put_conn(struct isert_conn *isert_conn)
 634 {
 635         kref_put(&isert_conn->kref, isert_release_kref);
 636 }
 637
 638 static void
 639 isert_handle_unbound_conn(struct isert_conn *isert_conn)
 640 {
 641         struct isert_np *isert_np = isert_conn->cm_id->context;
 642
 643         mutex_lock(&isert_np->mutex);
 644         if (!list_empty(&isert_conn->node)) {
 645                 /*
 646                  * This means iscsi doesn't know this connection
 647                  * so schedule a cleanup ourselves
 648                  */
 649                 list_del_init(&isert_conn->node);
 650                 isert_put_conn(isert_conn);
 651                 queue_work(isert_release_wq, &isert_conn->release_work);
 652         }
 653         mutex_unlock(&isert_np->mutex);
 654 }
 655
 656 /**
 657  * isert_conn_terminate() - Initiate connection termination
 658  * @isert_conn: isert connection struct
 659  *
 660  * Notes:
 661  * In case the connection state is BOUND, move state
 662  * to TEMINATING and start teardown sequence (rdma_disconnect).
 663  * In case the connection state is UP, complete flush as well.
 664  *
 665  * This routine must be called with mutex held. Thus it is
 666  * safe to call multiple times.
 667  */
 668 static void
 669 isert_conn_terminate(struct isert_conn *isert_conn)
 670 {
 671         int err;
 672
 673         if (isert_conn->state >= ISER_CONN_TERMINATING)
 674                 return;
 675
 676         isert_info("Terminating conn %p state %d\n",
 677                    isert_conn, isert_conn->state);
 678         isert_conn->state = ISER_CONN_TERMINATING;
 679         err = rdma_disconnect(isert_conn->cm_id);
 680         if (err)
 681                 isert_warn("Failed rdma_disconnect isert_conn %p\n",
 682                            isert_conn);
 683 }
 684
 685 static int
 686 isert_np_cma_handler(struct isert_np *isert_np,
 687                      enum rdma_cm_event_type event)
 688 {
 689         isert_dbg("%s (%d): isert np %p\n",
 690                   rdma_event_msg(event), event, isert_np);
 691
 692         switch (event) {
 693         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 694                 isert_np->cm_id = NULL;
 695                 break;
 696         case RDMA_CM_EVENT_ADDR_CHANGE:
 697                 isert_np->cm_id = isert_setup_id(isert_np);
 698                 if (IS_ERR(isert_np->cm_id)) {
 699                         isert_err("isert np %p setup id failed: %ld\n",
 700                                   isert_np, PTR_ERR(isert_np->cm_id));
 701                         isert_np->cm_id = NULL;
 702                 }
 703                 break;
 704         default:
 705                 isert_err("isert np %p Unexpected event %d\n",
 706                           isert_np, event);
 707         }
 708
 709         return -1;
 710 }
 711
 712 static int
 713 isert_disconnected_handler(struct rdma_cm_id *cma_id,
 714                            enum rdma_cm_event_type event)
 715 {
 716         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 717
 718         mutex_lock(&isert_conn->mutex);
 719         switch (isert_conn->state) {
 720         case ISER_CONN_TERMINATING:
 721                 break;
 722         case ISER_CONN_UP:
 723                 isert_conn_terminate(isert_conn);
 724                 ib_drain_qp(isert_conn->qp);
 725                 isert_handle_unbound_conn(isert_conn);
 726                 break;
 727         case ISER_CONN_BOUND:
 728         case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
 729                 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
 730                 break;
 731         default:
 732                 isert_warn("conn %p teminating in state %d\n",
 733                            isert_conn, isert_conn->state);
 734         }
 735         mutex_unlock(&isert_conn->mutex);
 736
 737         return 0;
 738 }
 739
 740 static int
 741 isert_connect_error(struct rdma_cm_id *cma_id)
 742 {
 743         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 744
 745         list_del_init(&isert_conn->node);
 746         isert_conn->cm_id = NULL;
 747         isert_put_conn(isert_conn);
 748
 749         return -1;
 750 }
 751
 752 static int
 753 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 754 {
 755         struct isert_np *isert_np = cma_id->context;
 756         int ret = 0;
 757
 758         isert_info("%s (%d): status %d id %p np %p\n",
 759                    rdma_event_msg(event->event), event->event,
 760                    event->status, cma_id, cma_id->context);
 761
 762         if (isert_np->cm_id == cma_id)
 763                 return isert_np_cma_handler(cma_id->context, event->event);
 764
 765         switch (event->event) {
 766         case RDMA_CM_EVENT_CONNECT_REQUEST:
 767                 ret = isert_connect_request(cma_id, event);
 768                 if (ret)
 769                         isert_err("failed handle connect request %d\n", ret);
 770                 break;
 771         case RDMA_CM_EVENT_ESTABLISHED:
 772                 isert_connected_handler(cma_id);
 773                 break;
 774         case RDMA_CM_EVENT_ADDR_CHANGE:    /* FALLTHRU */
 775         case RDMA_CM_EVENT_DISCONNECTED:   /* FALLTHRU */
 776         case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
 777         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
 778                 ret = isert_disconnected_handler(cma_id, event->event);
 779                 break;
 780         case RDMA_CM_EVENT_REJECTED:       /* FALLTHRU */
 781         case RDMA_CM_EVENT_UNREACHABLE:    /* FALLTHRU */
 782         case RDMA_CM_EVENT_CONNECT_ERROR:
 783                 ret = isert_connect_error(cma_id);
 784                 break;
 785         default:
 786                 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
 787                 break;
 788         }
 789
 790         return ret;
 791 }
 792
 793 static int
 794 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
 795 {
 796         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 797         int i, ret;
 798         struct iser_rx_desc *rx_desc;
 799
 800         for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
 801                 rx_desc = &isert_conn->rx_descs[i];
 802
 803                 rx_wr->wr_cqe = &rx_desc->rx_cqe;
 804                 rx_wr->sg_list = &rx_desc->rx_sg;
 805                 rx_wr->num_sge = 1;
 806                 rx_wr->next = rx_wr + 1;
 807         }
 808         rx_wr--;
 809         rx_wr->next = NULL; /* mark end of work requests list */
 810
 811         ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
 812                            &rx_wr_failed);
 813         if (ret)
 814                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 815
 816         return ret;
 817 }
 818
 819 static int
 820 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
 821 {
 822         struct ib_recv_wr *rx_wr_failed, rx_wr;
 823         int ret;
 824
 825         rx_wr.wr_cqe = &rx_desc->rx_cqe;
 826         rx_wr.sg_list = &rx_desc->rx_sg;
 827         rx_wr.num_sge = 1;
 828         rx_wr.next = NULL;
 829
 830         ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
 831         if (ret)
 832                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 833
 834         return ret;
 835 }
 836
 837 static int
 838 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 839 {
 840         struct ib_device *ib_dev = isert_conn->cm_id->device;
 841         struct ib_send_wr send_wr, *send_wr_failed;
 842         int ret;
 843
 844         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 845                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 846
 847         tx_desc->tx_cqe.done = isert_login_send_done;
 848
 849         send_wr.next    = NULL;
 850         send_wr.wr_cqe  = &tx_desc->tx_cqe;
 851         send_wr.sg_list = tx_desc->tx_sg;
 852         send_wr.num_sge = tx_desc->num_sge;
 853         send_wr.opcode  = IB_WR_SEND;
 854         send_wr.send_flags = IB_SEND_SIGNALED;
 855
 856         ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
 857         if (ret)
 858                 isert_err("ib_post_send() failed, ret: %d\n", ret);
 859
 860         return ret;
 861 }
 862
 863 static void
 864 isert_create_send_desc(struct isert_conn *isert_conn,
 865                        struct isert_cmd *isert_cmd,
 866                        struct iser_tx_desc *tx_desc)
 867 {
 868         struct isert_device *device = isert_conn->device;
 869         struct ib_device *ib_dev = device->ib_device;
 870
 871         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 872                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 873
 874         memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
 875         tx_desc->iser_header.flags = ISCSI_CTRL;
 876
 877         tx_desc->num_sge = 1;
 878
 879         if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
 880                 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
 881                 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 882         }
 883 }
 884
 885 static int
 886 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 887                    struct iser_tx_desc *tx_desc)
 888 {
 889         struct isert_device *device = isert_conn->device;
 890         struct ib_device *ib_dev = device->ib_device;
 891         u64 dma_addr;
 892
 893         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 894                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 895         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 896                 isert_err("ib_dma_mapping_error() failed\n");
 897                 return -ENOMEM;
 898         }
 899
 900         tx_desc->dma_addr = dma_addr;
 901         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 902         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 903         tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
 904
 905         isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
 906                   tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
 907                   tx_desc->tx_sg[0].lkey);
 908
 909         return 0;
 910 }
 911
 912 static void
 913 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 914                    struct ib_send_wr *send_wr)
 915 {
 916         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 917
 918         tx_desc->tx_cqe.done = isert_send_done;
 919         send_wr->wr_cqe = &tx_desc->tx_cqe;
 920
 921         if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
 922                 send_wr->opcode  = IB_WR_SEND_WITH_INV;
 923                 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
 924         } else {
 925                 send_wr->opcode = IB_WR_SEND;
 926         }
 927
 928         send_wr->sg_list = &tx_desc->tx_sg[0];
 929         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 930         send_wr->send_flags = IB_SEND_SIGNALED;
 931 }
 932
 933 static int
 934 isert_login_post_recv(struct isert_conn *isert_conn)
 935 {
 936         struct ib_recv_wr rx_wr, *rx_wr_fail;
 937         struct ib_sge sge;
 938         int ret;
 939
 940         memset(&sge, 0, sizeof(struct ib_sge));
 941         sge.addr = isert_conn->login_req_dma;
 942         sge.length = ISER_RX_PAYLOAD_SIZE;
 943         sge.lkey = isert_conn->device->pd->local_dma_lkey;
 944
 945         isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
 946                 sge.addr, sge.length, sge.lkey);
 947
 948         isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
 949
 950         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
 951         rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
 952         rx_wr.sg_list = &sge;
 953         rx_wr.num_sge = 1;
 954
 955         ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
 956         if (ret)
 957                 isert_err("ib_post_recv() failed: %d\n", ret);
 958
 959         return ret;
 960 }
 961
 962 static int
 963 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
 964                    u32 length)
 965 {
 966         struct isert_conn *isert_conn = conn->context;
 967         struct isert_device *device = isert_conn->device;
 968         struct ib_device *ib_dev = device->ib_device;
 969         struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
 970         int ret;
 971
 972         isert_create_send_desc(isert_conn, NULL, tx_desc);
 973
 974         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
 975                sizeof(struct iscsi_hdr));
 976
 977         isert_init_tx_hdrs(isert_conn, tx_desc);
 978
 979         if (length > 0) {
 980                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
 981
 982                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
 983                                            length, DMA_TO_DEVICE);
 984
 985                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
 986
 987                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
 988                                               length, DMA_TO_DEVICE);
 989
 990                 tx_dsg->addr    = isert_conn->login_rsp_dma;
 991                 tx_dsg->length  = length;
 992                 tx_dsg->lkey    = isert_conn->device->pd->local_dma_lkey;
 993                 tx_desc->num_sge = 2;
 994         }
 995         if (!login->login_failed) {
 996                 if (login->login_complete) {
 997                         ret = isert_alloc_rx_descriptors(isert_conn);
 998                         if (ret)
 999                                 return ret;
1000
1001                         ret = isert_post_recvm(isert_conn,
1002                                                ISERT_QP_MAX_RECV_DTOS);
1003                         if (ret)
1004                                 return ret;
1005
1006                         /* Now we are in FULL_FEATURE phase */
1007                         mutex_lock(&isert_conn->mutex);
1008                         isert_conn->state = ISER_CONN_FULL_FEATURE;
1009                         mutex_unlock(&isert_conn->mutex);
1010                         goto post_send;
1011                 }
1012
1013                 ret = isert_login_post_recv(isert_conn);
1014                 if (ret)
1015                         return ret;
1016         }
1017 post_send:
1018         ret = isert_login_post_send(isert_conn, tx_desc);
1019         if (ret)
1020                 return ret;
1021
1022         return 0;
1023 }
1024
1025 static void
1026 isert_rx_login_req(struct isert_conn *isert_conn)
1027 {
1028         struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1029         int rx_buflen = isert_conn->login_req_len;
1030         struct iscsi_conn *conn = isert_conn->conn;
1031         struct iscsi_login *login = conn->conn_login;
1032         int size;
1033
1034         isert_info("conn %p\n", isert_conn);
1035
1036         WARN_ON_ONCE(!login);
1037
1038         if (login->first_request) {
1039                 struct iscsi_login_req *login_req =
1040                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1041                 /*
1042                  * Setup the initial iscsi_login values from the leading
1043                  * login request PDU.
1044                  */
1045                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1046                 login->current_stage =
1047                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1048                          >> 2;
1049                 login->version_min      = login_req->min_version;
1050                 login->version_max      = login_req->max_version;
1051                 memcpy(login->isid, login_req->isid, 6);
1052                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1053                 login->init_task_tag    = login_req->itt;
1054                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1055                 login->cid              = be16_to_cpu(login_req->cid);
1056                 login->tsih             = be16_to_cpu(login_req->tsih);
1057         }
1058
1059         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1060
1061         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1062         isert_dbg("Using login payload size: %d, rx_buflen: %d "
1063                   "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1064                   MAX_KEY_VALUE_PAIRS);
1065         memcpy(login->req_buf, &rx_desc->data[0], size);
1066
1067         if (login->first_request) {
1068                 complete(&isert_conn->login_comp);
1069                 return;
1070         }
1071         schedule_delayed_work(&conn->login_work, 0);
1072 }
1073
1074 static struct iscsi_cmd
1075 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1076 {
1077         struct isert_conn *isert_conn = conn->context;
1078         struct isert_cmd *isert_cmd;
1079         struct iscsi_cmd *cmd;
1080
1081         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1082         if (!cmd) {
1083                 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1084                 return NULL;
1085         }
1086         isert_cmd = iscsit_priv_cmd(cmd);
1087         isert_cmd->conn = isert_conn;
1088         isert_cmd->iscsi_cmd = cmd;
1089         isert_cmd->rx_desc = rx_desc;
1090
1091         return cmd;
1092 }
1093
1094 static int
1095 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1096                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1097                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1098 {
1099         struct iscsi_conn *conn = isert_conn->conn;
1100         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1101         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1102         bool dump_payload = false;
1103         unsigned int data_len;
1104
1105         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1106         if (rc < 0)
1107                 return rc;
1108
1109         imm_data = cmd->immediate_data;
1110         imm_data_len = cmd->first_burst_len;
1111         unsol_data = cmd->unsolicited_data;
1112         data_len = cmd->se_cmd.data_length;
1113
1114         if (imm_data && imm_data_len == data_len)
1115                 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1116         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1117         if (rc < 0) {
1118                 return 0;
1119         } else if (rc > 0) {
1120                 dump_payload = true;
1121                 goto sequence_cmd;
1122         }
1123
1124         if (!imm_data)
1125                 return 0;
1126
1127         if (imm_data_len != data_len) {
1128                 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1129                 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1130                                     &rx_desc->data[0], imm_data_len);
1131                 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1132                           sg_nents, imm_data_len);
1133         } else {
1134                 sg_init_table(&isert_cmd->sg, 1);
1135                 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1136                 cmd->se_cmd.t_data_nents = 1;
1137                 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1138                 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1139                           imm_data_len);
1140         }
1141
1142         cmd->write_data_done += imm_data_len;
1143
1144         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1145                 spin_lock_bh(&cmd->istate_lock);
1146                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1147                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1148                 spin_unlock_bh(&cmd->istate_lock);
1149         }
1150
1151 sequence_cmd:
1152         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1153
1154         if (!rc && dump_payload == false && unsol_data)
1155                 iscsit_set_unsoliticed_dataout(cmd);
1156         else if (dump_payload && imm_data)
1157                 target_put_sess_cmd(&cmd->se_cmd);
1158
1159         return 0;
1160 }
1161
1162 static int
1163 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1164                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1165 {
1166         struct scatterlist *sg_start;
1167         struct iscsi_conn *conn = isert_conn->conn;
1168         struct iscsi_cmd *cmd = NULL;
1169         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1170         u32 unsol_data_len = ntoh24(hdr->dlength);
1171         int rc, sg_nents, sg_off, page_off;
1172
1173         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1174         if (rc < 0)
1175                 return rc;
1176         else if (!cmd)
1177                 return 0;
1178         /*
1179          * FIXME: Unexpected unsolicited_data out
1180          */
1181         if (!cmd->unsolicited_data) {
1182                 isert_err("Received unexpected solicited data payload\n");
1183                 dump_stack();
1184                 return -1;
1185         }
1186
1187         isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1188                   "write_data_done: %u, data_length: %u\n",
1189                   unsol_data_len,  cmd->write_data_done,
1190                   cmd->se_cmd.data_length);
1191
1192         sg_off = cmd->write_data_done / PAGE_SIZE;
1193         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1194         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1195         page_off = cmd->write_data_done % PAGE_SIZE;
1196         /*
1197          * FIXME: Non page-aligned unsolicited_data out
1198          */
1199         if (page_off) {
1200                 isert_err("unexpected non-page aligned data payload\n");
1201                 dump_stack();
1202                 return -1;
1203         }
1204         isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1205                   "sg_nents: %u from %p %u\n", sg_start, sg_off,
1206                   sg_nents, &rx_desc->data[0], unsol_data_len);
1207
1208         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1209                             unsol_data_len);
1210
1211         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1212         if (rc < 0)
1213                 return rc;
1214
1215         /*
1216          * multiple data-outs on the same command can arrive -
1217          * so post the buffer before hand
1218          */
1219         rc = isert_post_recv(isert_conn, rx_desc);
1220         if (rc) {
1221                 isert_err("ib_post_recv failed with %d\n", rc);
1222                 return rc;
1223         }
1224         return 0;
1225 }
1226
1227 static int
1228 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1229                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1230                      unsigned char *buf)
1231 {
1232         struct iscsi_conn *conn = isert_conn->conn;
1233         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1234         int rc;
1235
1236         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1237         if (rc < 0)
1238                 return rc;
1239         /*
1240          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1241          */
1242
1243         return iscsit_process_nop_out(conn, cmd, hdr);
1244 }
1245
1246 static int
1247 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1248                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1249                       struct iscsi_text *hdr)
1250 {
1251         struct iscsi_conn *conn = isert_conn->conn;
1252         u32 payload_length = ntoh24(hdr->dlength);
1253         int rc;
1254         unsigned char *text_in = NULL;
1255
1256         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1257         if (rc < 0)
1258                 return rc;
1259
1260         if (payload_length) {
1261                 text_in = kzalloc(payload_length, GFP_KERNEL);
1262                 if (!text_in) {
1263                         isert_err("Unable to allocate text_in of payload_length: %u\n",
1264                                   payload_length);
1265                         return -ENOMEM;
1266                 }
1267         }
1268         cmd->text_in_ptr = text_in;
1269
1270         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1271
1272         return iscsit_process_text_cmd(conn, cmd, hdr);
1273 }
1274
1275 static int
1276 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1277                 uint32_t read_stag, uint64_t read_va,
1278                 uint32_t write_stag, uint64_t write_va)
1279 {
1280         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1281         struct iscsi_conn *conn = isert_conn->conn;
1282         struct iscsi_cmd *cmd;
1283         struct isert_cmd *isert_cmd;
1284         int ret = -EINVAL;
1285         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1286
1287         if (conn->sess->sess_ops->SessionType &&
1288            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1289                 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1290                           " ignoring\n", opcode);
1291                 return 0;
1292         }
1293
1294         switch (opcode) {
1295         case ISCSI_OP_SCSI_CMD:
1296                 cmd = isert_allocate_cmd(conn, rx_desc);
1297                 if (!cmd)
1298                         break;
1299
1300                 isert_cmd = iscsit_priv_cmd(cmd);
1301                 isert_cmd->read_stag = read_stag;
1302                 isert_cmd->read_va = read_va;
1303                 isert_cmd->write_stag = write_stag;
1304                 isert_cmd->write_va = write_va;
1305                 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1306
1307                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1308                                         rx_desc, (unsigned char *)hdr);
1309                 break;
1310         case ISCSI_OP_NOOP_OUT:
1311                 cmd = isert_allocate_cmd(conn, rx_desc);
1312                 if (!cmd)
1313                         break;
1314
1315                 isert_cmd = iscsit_priv_cmd(cmd);
1316                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1317                                            rx_desc, (unsigned char *)hdr);
1318                 break;
1319         case ISCSI_OP_SCSI_DATA_OUT:
1320                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1321                                                 (unsigned char *)hdr);
1322                 break;
1323         case ISCSI_OP_SCSI_TMFUNC:
1324                 cmd = isert_allocate_cmd(conn, rx_desc);
1325                 if (!cmd)
1326                         break;
1327
1328                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1329                                                 (unsigned char *)hdr);
1330                 break;
1331         case ISCSI_OP_LOGOUT:
1332                 cmd = isert_allocate_cmd(conn, rx_desc);
1333                 if (!cmd)
1334                         break;
1335
1336                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1337                 break;
1338         case ISCSI_OP_TEXT:
1339                 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1340                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1341                 else
1342                         cmd = isert_allocate_cmd(conn, rx_desc);
1343
1344                 if (!cmd)
1345                         break;
1346
1347                 isert_cmd = iscsit_priv_cmd(cmd);
1348                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1349                                             rx_desc, (struct iscsi_text *)hdr);
1350                 break;
1351         default:
1352                 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1353                 dump_stack();
1354                 break;
1355         }
1356
1357         return ret;
1358 }
1359
1360 static void
1361 isert_print_wc(struct ib_wc *wc, const char *type)
1362 {
1363         if (wc->status != IB_WC_WR_FLUSH_ERR)
1364                 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1365                           ib_wc_status_msg(wc->status), wc->status,
1366                           wc->vendor_err);
1367         else
1368                 isert_dbg("%s failure: %s (%d)\n", type,
1369                           ib_wc_status_msg(wc->status), wc->status);
1370 }
1371
1372 static void
1373 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1374 {
1375         struct isert_conn *isert_conn = wc->qp->qp_context;
1376         struct ib_device *ib_dev = isert_conn->cm_id->device;
1377         struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1378         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1379         struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1380         uint64_t read_va = 0, write_va = 0;
1381         uint32_t read_stag = 0, write_stag = 0;
1382
1383         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1384                 isert_print_wc(wc, "recv");
1385                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1386                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1387                 return;
1388         }
1389
1390         ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1391                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1392
1393         isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1394                  rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1395                  (int)(wc->byte_len - ISER_HEADERS_LEN));
1396
1397         switch (iser_ctrl->flags & 0xF0) {
1398         case ISCSI_CTRL:
1399                 if (iser_ctrl->flags & ISER_RSV) {
1400                         read_stag = be32_to_cpu(iser_ctrl->read_stag);
1401                         read_va = be64_to_cpu(iser_ctrl->read_va);
1402                         isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1403                                   read_stag, (unsigned long long)read_va);
1404                 }
1405                 if (iser_ctrl->flags & ISER_WSV) {
1406                         write_stag = be32_to_cpu(iser_ctrl->write_stag);
1407                         write_va = be64_to_cpu(iser_ctrl->write_va);
1408                         isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1409                                   write_stag, (unsigned long long)write_va);
1410                 }
1411
1412                 isert_dbg("ISER ISCSI_CTRL PDU\n");
1413                 break;
1414         case ISER_HELLO:
1415                 isert_err("iSER Hello message\n");
1416                 break;
1417         default:
1418                 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1419                 break;
1420         }
1421
1422         isert_rx_opcode(isert_conn, rx_desc,
1423                         read_stag, read_va, write_stag, write_va);
1424
1425         ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1426                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1427 }
1428
1429 static void
1430 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1431 {
1432         struct isert_conn *isert_conn = wc->qp->qp_context;
1433         struct ib_device *ib_dev = isert_conn->cm_id->device;
1434
1435         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1436                 isert_print_wc(wc, "login recv");
1437                 return;
1438         }
1439
1440         ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1441                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1442
1443         isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1444
1445         if (isert_conn->conn) {
1446                 struct iscsi_login *login = isert_conn->conn->conn_login;
1447
1448                 if (login && !login->first_request)
1449                         isert_rx_login_req(isert_conn);
1450         }
1451
1452         mutex_lock(&isert_conn->mutex);
1453         complete(&isert_conn->login_req_comp);
1454         mutex_unlock(&isert_conn->mutex);
1455
1456         ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1457                                 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1458 }
1459
1460 static void
1461 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1462 {
1463         struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
1464         enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1465
1466         if (!cmd->rw.nr_ops)
1467                 return;
1468
1469         if (isert_prot_cmd(conn, se_cmd)) {
1470                 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1471                                 conn->cm_id->port_num, se_cmd->t_data_sg,
1472                                 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1473                                 se_cmd->t_prot_nents, dir);
1474         } else {
1475                 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1476                                 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1477         }
1478
1479         cmd->rw.nr_ops = 0;
1480 }
1481
1482 static void
1483 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1484 {
1485         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1486         struct isert_conn *isert_conn = isert_cmd->conn;
1487         struct iscsi_conn *conn = isert_conn->conn;
1488         struct iscsi_text_rsp *hdr;
1489
1490         isert_dbg("Cmd %p\n", isert_cmd);
1491
1492         switch (cmd->iscsi_opcode) {
1493         case ISCSI_OP_SCSI_CMD:
1494                 spin_lock_bh(&conn->cmd_lock);
1495                 if (!list_empty(&cmd->i_conn_node))
1496                         list_del_init(&cmd->i_conn_node);
1497                 spin_unlock_bh(&conn->cmd_lock);
1498
1499                 if (cmd->data_direction == DMA_TO_DEVICE) {
1500                         iscsit_stop_dataout_timer(cmd);
1501                         /*
1502                          * Check for special case during comp_err where
1503                          * WRITE_PENDING has been handed off from core,
1504                          * but requires an extra target_put_sess_cmd()
1505                          * before transport_generic_free_cmd() below.
1506                          */
1507                         if (comp_err &&
1508                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1509                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1510
1511                                 target_put_sess_cmd(se_cmd);
1512                         }
1513                 }
1514
1515                 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1516                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1517                 break;
1518         case ISCSI_OP_SCSI_TMFUNC:
1519                 spin_lock_bh(&conn->cmd_lock);
1520                 if (!list_empty(&cmd->i_conn_node))
1521                         list_del_init(&cmd->i_conn_node);
1522                 spin_unlock_bh(&conn->cmd_lock);
1523
1524                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1525                 break;
1526         case ISCSI_OP_REJECT:
1527         case ISCSI_OP_NOOP_OUT:
1528         case ISCSI_OP_TEXT:
1529                 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1530                 /* If the continue bit is on, keep the command alive */
1531                 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1532                         break;
1533
1534                 spin_lock_bh(&conn->cmd_lock);
1535                 if (!list_empty(&cmd->i_conn_node))
1536                         list_del_init(&cmd->i_conn_node);
1537                 spin_unlock_bh(&conn->cmd_lock);
1538
1539                 /*
1540                  * Handle special case for REJECT when iscsi_add_reject*() has
1541                  * overwritten the original iscsi_opcode assignment, and the
1542                  * associated cmd->se_cmd needs to be released.
1543                  */
1544                 if (cmd->se_cmd.se_tfo != NULL) {
1545                         isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1546                                  cmd->iscsi_opcode);
1547                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1548                         break;
1549                 }
1550                 /*
1551                  * Fall-through
1552                  */
1553         default:
1554                 iscsit_release_cmd(cmd);
1555                 break;
1556         }
1557 }
1558
1559 static void
1560 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1561 {
1562         if (tx_desc->dma_addr != 0) {
1563                 isert_dbg("unmap single for tx_desc->dma_addr\n");
1564                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1565                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1566                 tx_desc->dma_addr = 0;
1567         }
1568 }
1569
1570 static void
1571 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1572                      struct ib_device *ib_dev, bool comp_err)
1573 {
1574         if (isert_cmd->pdu_buf_dma != 0) {
1575                 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1576                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1577                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1578                 isert_cmd->pdu_buf_dma = 0;
1579         }
1580
1581         isert_unmap_tx_desc(tx_desc, ib_dev);
1582         isert_put_cmd(isert_cmd, comp_err);
1583 }
1584
1585 static int
1586 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1587 {
1588         struct ib_mr_status mr_status;
1589         int ret;
1590
1591         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1592         if (ret) {
1593                 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1594                 goto fail_mr_status;
1595         }
1596
1597         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1598                 u64 sec_offset_err;
1599                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1600
1601                 switch (mr_status.sig_err.err_type) {
1602                 case IB_SIG_BAD_GUARD:
1603                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1604                         break;
1605                 case IB_SIG_BAD_REFTAG:
1606                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1607                         break;
1608                 case IB_SIG_BAD_APPTAG:
1609                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1610                         break;
1611                 }
1612                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1613                 do_div(sec_offset_err, block_size);
1614                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1615
1616                 isert_err("PI error found type %d at sector 0x%llx "
1617                           "expected 0x%x vs actual 0x%x\n",
1618                           mr_status.sig_err.err_type,
1619                           (unsigned long long)se_cmd->bad_sector,
1620                           mr_status.sig_err.expected,
1621                           mr_status.sig_err.actual);
1622                 ret = 1;
1623         }
1624
1625 fail_mr_status:
1626         return ret;
1627 }
1628
1629 static void
1630 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1631 {
1632         struct isert_conn *isert_conn = wc->qp->qp_context;
1633         struct isert_device *device = isert_conn->device;
1634         struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1635         struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1636         struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1637         int ret = 0;
1638
1639         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1640                 isert_print_wc(wc, "rdma write");
1641                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1642                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1643                 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1644                 return;
1645         }
1646
1647         isert_dbg("Cmd %p\n", isert_cmd);
1648
1649         ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr);
1650         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1651
1652         if (ret)
1653                 transport_send_check_condition_and_sense(cmd, cmd->pi_err, 0);
1654         else
1655                 isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1656 }
1657
1658 static void
1659 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1660 {
1661         struct isert_conn *isert_conn = wc->qp->qp_context;
1662         struct isert_device *device = isert_conn->device;
1663         struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1664         struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1665         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1666         struct se_cmd *se_cmd = &cmd->se_cmd;
1667         int ret = 0;
1668
1669         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1670                 isert_print_wc(wc, "rdma read");
1671                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1672                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1673                 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1674                 return;
1675         }
1676
1677         isert_dbg("Cmd %p\n", isert_cmd);
1678
1679         iscsit_stop_dataout_timer(cmd);
1680
1681         if (isert_prot_cmd(isert_conn, se_cmd))
1682                 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr);
1683         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1684         cmd->write_data_done = 0;
1685
1686         isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1687         spin_lock_bh(&cmd->istate_lock);
1688         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1689         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1690         spin_unlock_bh(&cmd->istate_lock);
1691
1692         if (ret) {
1693                 target_put_sess_cmd(se_cmd);
1694                 transport_send_check_condition_and_sense(se_cmd,
1695                                                          se_cmd->pi_err, 0);
1696         } else {
1697                 target_execute_cmd(se_cmd);
1698         }
1699 }
1700
1701 static void
1702 isert_do_control_comp(struct work_struct *work)
1703 {
1704         struct isert_cmd *isert_cmd = container_of(work,
1705                         struct isert_cmd, comp_work);
1706         struct isert_conn *isert_conn = isert_cmd->conn;
1707         struct ib_device *ib_dev = isert_conn->cm_id->device;
1708         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1709
1710         isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1711
1712         switch (cmd->i_state) {
1713         case ISTATE_SEND_TASKMGTRSP:
1714                 iscsit_tmr_post_handler(cmd, cmd->conn);
1715         case ISTATE_SEND_REJECT:   /* FALLTHRU */
1716         case ISTATE_SEND_TEXTRSP:  /* FALLTHRU */
1717                 cmd->i_state = ISTATE_SENT_STATUS;
1718                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1719                                      ib_dev, false);
1720                 break;
1721         case ISTATE_SEND_LOGOUTRSP:
1722                 iscsit_logout_post_handler(cmd, cmd->conn);
1723                 break;
1724         default:
1725                 isert_err("Unknown i_state %d\n", cmd->i_state);
1726                 dump_stack();
1727                 break;
1728         }
1729 }
1730
1731 static void
1732 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1733 {
1734         struct isert_conn *isert_conn = wc->qp->qp_context;
1735         struct ib_device *ib_dev = isert_conn->cm_id->device;
1736         struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1737
1738         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1739                 isert_print_wc(wc, "login send");
1740                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1741                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1742         }
1743
1744         isert_unmap_tx_desc(tx_desc, ib_dev);
1745 }
1746
1747 static void
1748 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1749 {
1750         struct isert_conn *isert_conn = wc->qp->qp_context;
1751         struct ib_device *ib_dev = isert_conn->cm_id->device;
1752         struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1753         struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1754
1755         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1756                 isert_print_wc(wc, "send");
1757                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1758                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1759                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1760                 return;
1761         }
1762
1763         isert_dbg("Cmd %p\n", isert_cmd);
1764
1765         switch (isert_cmd->iscsi_cmd->i_state) {
1766         case ISTATE_SEND_TASKMGTRSP:
1767         case ISTATE_SEND_LOGOUTRSP:
1768         case ISTATE_SEND_REJECT:
1769         case ISTATE_SEND_TEXTRSP:
1770                 isert_unmap_tx_desc(tx_desc, ib_dev);
1771
1772                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1773                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1774                 return;
1775         default:
1776                 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
1777                 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1778                 break;
1779         }
1780 }
1781
1782 static int
1783 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1784 {
1785         struct ib_send_wr *wr_failed;
1786         int ret;
1787
1788         ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1789         if (ret) {
1790                 isert_err("ib_post_recv failed with %d\n", ret);
1791                 return ret;
1792         }
1793
1794         ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
1795                            &wr_failed);
1796         if (ret) {
1797                 isert_err("ib_post_send failed with %d\n", ret);
1798                 return ret;
1799         }
1800         return ret;
1801 }
1802
1803 static int
1804 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1805 {
1806         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1807         struct isert_conn *isert_conn = conn->context;
1808         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1809         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1810                                 &isert_cmd->tx_desc.iscsi_header;
1811
1812         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1813         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1814         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1815         /*
1816          * Attach SENSE DATA payload to iSCSI Response PDU
1817          */
1818         if (cmd->se_cmd.sense_buffer &&
1819             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1820             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1821                 struct isert_device *device = isert_conn->device;
1822                 struct ib_device *ib_dev = device->ib_device;
1823                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1824                 u32 padding, pdu_len;
1825
1826                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1827                                    cmd->sense_buffer);
1828                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1829
1830                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1831                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1832                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1833
1834                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1835                                 (void *)cmd->sense_buffer, pdu_len,
1836                                 DMA_TO_DEVICE);
1837
1838                 isert_cmd->pdu_buf_len = pdu_len;
1839                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1840                 tx_dsg->length  = pdu_len;
1841                 tx_dsg->lkey    = device->pd->local_dma_lkey;
1842                 isert_cmd->tx_desc.num_sge = 2;
1843         }
1844
1845         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1846
1847         isert_dbg("Posting SCSI Response\n");
1848
1849         return isert_post_response(isert_conn, isert_cmd);
1850 }
1851
1852 static void
1853 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1854 {
1855         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1856         struct isert_conn *isert_conn = conn->context;
1857
1858         spin_lock_bh(&conn->cmd_lock);
1859         if (!list_empty(&cmd->i_conn_node))
1860                 list_del_init(&cmd->i_conn_node);
1861         spin_unlock_bh(&conn->cmd_lock);
1862
1863         if (cmd->data_direction == DMA_TO_DEVICE)
1864                 iscsit_stop_dataout_timer(cmd);
1865         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1866 }
1867
1868 static enum target_prot_op
1869 isert_get_sup_prot_ops(struct iscsi_conn *conn)
1870 {
1871         struct isert_conn *isert_conn = conn->context;
1872         struct isert_device *device = isert_conn->device;
1873
1874         if (conn->tpg->tpg_attrib.t10_pi) {
1875                 if (device->pi_capable) {
1876                         isert_info("conn %p PI offload enabled\n", isert_conn);
1877                         isert_conn->pi_support = true;
1878                         return TARGET_PROT_ALL;
1879                 }
1880         }
1881
1882         isert_info("conn %p PI offload disabled\n", isert_conn);
1883         isert_conn->pi_support = false;
1884
1885         return TARGET_PROT_NORMAL;
1886 }
1887
1888 static int
1889 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1890                 bool nopout_response)
1891 {
1892         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1893         struct isert_conn *isert_conn = conn->context;
1894         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1895
1896         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1897         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1898                                &isert_cmd->tx_desc.iscsi_header,
1899                                nopout_response);
1900         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1901         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1902
1903         isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1904
1905         return isert_post_response(isert_conn, isert_cmd);
1906 }
1907
1908 static int
1909 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1910 {
1911         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1912         struct isert_conn *isert_conn = conn->context;
1913         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1914
1915         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1916         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1917                                 &isert_cmd->tx_desc.iscsi_header);
1918         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1919         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1920
1921         isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1922
1923         return isert_post_response(isert_conn, isert_cmd);
1924 }
1925
1926 static int
1927 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1928 {
1929         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1930         struct isert_conn *isert_conn = conn->context;
1931         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1932
1933         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1934         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1935                                   &isert_cmd->tx_desc.iscsi_header);
1936         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1937         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1938
1939         isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1940
1941         return isert_post_response(isert_conn, isert_cmd);
1942 }
1943
1944 static int
1945 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1946 {
1947         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1948         struct isert_conn *isert_conn = conn->context;
1949         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1950         struct isert_device *device = isert_conn->device;
1951         struct ib_device *ib_dev = device->ib_device;
1952         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1953         struct iscsi_reject *hdr =
1954                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1955
1956         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1957         iscsit_build_reject(cmd, conn, hdr);
1958         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1959
1960         hton24(hdr->dlength, ISCSI_HDR_LEN);
1961         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1962                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1963                         DMA_TO_DEVICE);
1964         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1965         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1966         tx_dsg->length  = ISCSI_HDR_LEN;
1967         tx_dsg->lkey    = device->pd->local_dma_lkey;
1968         isert_cmd->tx_desc.num_sge = 2;
1969
1970         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1971
1972         isert_dbg("conn %p Posting Reject\n", isert_conn);
1973
1974         return isert_post_response(isert_conn, isert_cmd);
1975 }
1976
1977 static int
1978 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1979 {
1980         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1981         struct isert_conn *isert_conn = conn->context;
1982         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1983         struct iscsi_text_rsp *hdr =
1984                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1985         u32 txt_rsp_len;
1986         int rc;
1987
1988         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1989         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
1990         if (rc < 0)
1991                 return rc;
1992
1993         txt_rsp_len = rc;
1994         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1995
1996         if (txt_rsp_len) {
1997                 struct isert_device *device = isert_conn->device;
1998                 struct ib_device *ib_dev = device->ib_device;
1999                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2000                 void *txt_rsp_buf = cmd->buf_ptr;
2001
2002                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2003                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2004
2005                 isert_cmd->pdu_buf_len = txt_rsp_len;
2006                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2007                 tx_dsg->length  = txt_rsp_len;
2008                 tx_dsg->lkey    = device->pd->local_dma_lkey;
2009                 isert_cmd->tx_desc.num_sge = 2;
2010         }
2011         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2012
2013         isert_dbg("conn %p Text Response\n", isert_conn);
2014
2015         return isert_post_response(isert_conn, isert_cmd);
2016 }
2017
2018 static inline void
2019 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2020                      struct ib_sig_domain *domain)
2021 {
2022         domain->sig_type = IB_SIG_TYPE_T10_DIF;
2023         domain->sig.dif.bg_type = IB_T10DIF_CRC;
2024         domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2025         domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2026         /*
2027          * At the moment we hard code those, but if in the future
2028          * the target core would like to use it, we will take it
2029          * from se_cmd.
2030          */
2031         domain->sig.dif.apptag_check_mask = 0xffff;
2032         domain->sig.dif.app_escape = true;
2033         domain->sig.dif.ref_escape = true;
2034         if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2035             se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2036                 domain->sig.dif.ref_remap = true;
2037 };
2038
2039 static int
2040 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2041 {
2042         memset(sig_attrs, 0, sizeof(*sig_attrs));
2043
2044         switch (se_cmd->prot_op) {
2045         case TARGET_PROT_DIN_INSERT:
2046         case TARGET_PROT_DOUT_STRIP:
2047                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2048                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2049                 break;
2050         case TARGET_PROT_DOUT_INSERT:
2051         case TARGET_PROT_DIN_STRIP:
2052                 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2053                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2054                 break;
2055         case TARGET_PROT_DIN_PASS:
2056         case TARGET_PROT_DOUT_PASS:
2057                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2058                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2059                 break;
2060         default:
2061                 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2062                 return -EINVAL;
2063         }
2064
2065         sig_attrs->check_mask =
2066                (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2067                (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2068                (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2069         return 0;
2070 }
2071
2072 static int
2073 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2074                 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2075 {
2076         struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
2077         enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2078         u8 port_num = conn->cm_id->port_num;
2079         u64 addr;
2080         u32 rkey, offset;
2081         int ret;
2082
2083         if (dir == DMA_FROM_DEVICE) {
2084                 addr = cmd->write_va;
2085                 rkey = cmd->write_stag;
2086                 offset = cmd->iscsi_cmd->write_data_done;
2087         } else {
2088                 addr = cmd->read_va;
2089                 rkey = cmd->read_stag;
2090                 offset = 0;
2091         }
2092
2093         if (isert_prot_cmd(conn, se_cmd)) {
2094                 struct ib_sig_attrs sig_attrs;
2095
2096                 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2097                 if (ret)
2098                         return ret;
2099
2100                 WARN_ON_ONCE(offset);
2101                 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2102                                 se_cmd->t_data_sg, se_cmd->t_data_nents,
2103                                 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2104                                 &sig_attrs, addr, rkey, dir);
2105         } else {
2106                 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2107                                 se_cmd->t_data_sg, se_cmd->t_data_nents,
2108                                 offset, addr, rkey, dir);
2109         }
2110         if (ret < 0) {
2111                 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2112                 return ret;
2113         }
2114
2115         ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2116         if (ret < 0)
2117                 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2118         return ret;
2119 }
2120
2121 static int
2122 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2123 {
2124         struct se_cmd *se_cmd = &cmd->se_cmd;
2125         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2126         struct isert_conn *isert_conn = conn->context;
2127         struct ib_cqe *cqe = NULL;
2128         struct ib_send_wr *chain_wr = NULL;
2129         int rc;
2130
2131         isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2132                  isert_cmd, se_cmd->data_length);
2133
2134         if (isert_prot_cmd(isert_conn, se_cmd)) {
2135                 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2136                 cqe = &isert_cmd->tx_desc.tx_cqe;
2137         } else {
2138                 /*
2139                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2140                  */
2141                 isert_create_send_desc(isert_conn, isert_cmd,
2142                                        &isert_cmd->tx_desc);
2143                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2144                                      &isert_cmd->tx_desc.iscsi_header);
2145                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2146                 isert_init_send_wr(isert_conn, isert_cmd,
2147                                    &isert_cmd->tx_desc.send_wr);
2148
2149                 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2150                 if (rc) {
2151                         isert_err("ib_post_recv failed with %d\n", rc);
2152                         return rc;
2153                 }
2154
2155                 chain_wr = &isert_cmd->tx_desc.send_wr;
2156         }
2157
2158         isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2159         isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n", isert_cmd);
2160         return 1;
2161 }
2162
2163 static int
2164 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2165 {
2166         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2167
2168         isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2169                  isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2170
2171         isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2172         isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2173                         &isert_cmd->tx_desc.tx_cqe, NULL);
2174
2175         isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2176                  isert_cmd);
2177         return 0;
2178 }
2179
2180 static int
2181 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2182 {
2183         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2184         int ret = 0;
2185
2186         switch (state) {
2187         case ISTATE_REMOVE:
2188                 spin_lock_bh(&conn->cmd_lock);
2189                 list_del_init(&cmd->i_conn_node);
2190                 spin_unlock_bh(&conn->cmd_lock);
2191                 isert_put_cmd(isert_cmd, true);
2192                 break;
2193         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2194                 ret = isert_put_nopin(cmd, conn, false);
2195                 break;
2196         default:
2197                 isert_err("Unknown immediate state: 0x%02x\n", state);
2198                 ret = -EINVAL;
2199                 break;
2200         }
2201
2202         return ret;
2203 }
2204
2205 static int
2206 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2207 {
2208         struct isert_conn *isert_conn = conn->context;
2209         int ret;
2210
2211         switch (state) {
2212         case ISTATE_SEND_LOGOUTRSP:
2213                 ret = isert_put_logout_rsp(cmd, conn);
2214                 if (!ret)
2215                         isert_conn->logout_posted = true;
2216                 break;
2217         case ISTATE_SEND_NOPIN:
2218                 ret = isert_put_nopin(cmd, conn, true);
2219                 break;
2220         case ISTATE_SEND_TASKMGTRSP:
2221                 ret = isert_put_tm_rsp(cmd, conn);
2222                 break;
2223         case ISTATE_SEND_REJECT:
2224                 ret = isert_put_reject(cmd, conn);
2225                 break;
2226         case ISTATE_SEND_TEXTRSP:
2227                 ret = isert_put_text_rsp(cmd, conn);
2228                 break;
2229         case ISTATE_SEND_STATUS:
2230                 /*
2231                  * Special case for sending non GOOD SCSI status from TX thread
2232                  * context during pre se_cmd excecution failure.
2233                  */
2234                 ret = isert_put_response(conn, cmd);
2235                 break;
2236         default:
2237                 isert_err("Unknown response state: 0x%02x\n", state);
2238                 ret = -EINVAL;
2239                 break;
2240         }
2241
2242         return ret;
2243 }
2244
2245 struct rdma_cm_id *
2246 isert_setup_id(struct isert_np *isert_np)
2247 {
2248         struct iscsi_np *np = isert_np->np;
2249         struct rdma_cm_id *id;
2250         struct sockaddr *sa;
2251         int ret;
2252
2253         sa = (struct sockaddr *)&np->np_sockaddr;
2254         isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2255
2256         id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2257                             RDMA_PS_TCP, IB_QPT_RC);
2258         if (IS_ERR(id)) {
2259                 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2260                 ret = PTR_ERR(id);
2261                 goto out;
2262         }
2263         isert_dbg("id %p context %p\n", id, id->context);
2264
2265         ret = rdma_bind_addr(id, sa);
2266         if (ret) {
2267                 isert_err("rdma_bind_addr() failed: %d\n", ret);
2268                 goto out_id;
2269         }
2270
2271         ret = rdma_listen(id, 0);
2272         if (ret) {
2273                 isert_err("rdma_listen() failed: %d\n", ret);
2274                 goto out_id;
2275         }
2276
2277         return id;
2278 out_id:
2279         rdma_destroy_id(id);
2280 out:
2281         return ERR_PTR(ret);
2282 }
2283
2284 static int
2285 isert_setup_np(struct iscsi_np *np,
2286                struct sockaddr_storage *ksockaddr)
2287 {
2288         struct isert_np *isert_np;
2289         struct rdma_cm_id *isert_lid;
2290         int ret;
2291
2292         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2293         if (!isert_np) {
2294                 isert_err("Unable to allocate struct isert_np\n");
2295                 return -ENOMEM;
2296         }
2297         sema_init(&isert_np->sem, 0);
2298         mutex_init(&isert_np->mutex);
2299         INIT_LIST_HEAD(&isert_np->accepted);
2300         INIT_LIST_HEAD(&isert_np->pending);
2301         isert_np->np = np;
2302
2303         /*
2304          * Setup the np->np_sockaddr from the passed sockaddr setup
2305          * in iscsi_target_configfs.c code..
2306          */
2307         memcpy(&np->np_sockaddr, ksockaddr,
2308                sizeof(struct sockaddr_storage));
2309
2310         isert_lid = isert_setup_id(isert_np);
2311         if (IS_ERR(isert_lid)) {
2312                 ret = PTR_ERR(isert_lid);
2313                 goto out;
2314         }
2315
2316         isert_np->cm_id = isert_lid;
2317         np->np_context = isert_np;
2318
2319         return 0;
2320
2321 out:
2322         kfree(isert_np);
2323
2324         return ret;
2325 }
2326
2327 static int
2328 isert_rdma_accept(struct isert_conn *isert_conn)
2329 {
2330         struct rdma_cm_id *cm_id = isert_conn->cm_id;
2331         struct rdma_conn_param cp;
2332         int ret;
2333         struct iser_cm_hdr rsp_hdr;
2334
2335         memset(&cp, 0, sizeof(struct rdma_conn_param));
2336         cp.initiator_depth = isert_conn->initiator_depth;
2337         cp.retry_count = 7;
2338         cp.rnr_retry_count = 7;
2339
2340         memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2341         rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2342         if (!isert_conn->snd_w_inv)
2343                 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2344         cp.private_data = (void *)&rsp_hdr;
2345         cp.private_data_len = sizeof(rsp_hdr);
2346
2347         ret = rdma_accept(cm_id, &cp);
2348         if (ret) {
2349                 isert_err("rdma_accept() failed with: %d\n", ret);
2350                 return ret;
2351         }
2352
2353         return 0;
2354 }
2355
2356 static int
2357 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2358 {
2359         struct isert_conn *isert_conn = conn->context;
2360         int ret;
2361
2362         isert_info("before login_req comp conn: %p\n", isert_conn);
2363         ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2364         if (ret) {
2365                 isert_err("isert_conn %p interrupted before got login req\n",
2366                           isert_conn);
2367                 return ret;
2368         }
2369         reinit_completion(&isert_conn->login_req_comp);
2370
2371         /*
2372          * For login requests after the first PDU, isert_rx_login_req() will
2373          * kick schedule_delayed_work(&conn->login_work) as the packet is
2374          * received, which turns this callback from iscsi_target_do_login_rx()
2375          * into a NOP.
2376          */
2377         if (!login->first_request)
2378                 return 0;
2379
2380         isert_rx_login_req(isert_conn);
2381
2382         isert_info("before login_comp conn: %p\n", conn);
2383         ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2384         if (ret)
2385                 return ret;
2386
2387         isert_info("processing login->req: %p\n", login->req);
2388
2389         return 0;
2390 }
2391
2392 static void
2393 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2394                     struct isert_conn *isert_conn)
2395 {
2396         struct rdma_cm_id *cm_id = isert_conn->cm_id;
2397         struct rdma_route *cm_route = &cm_id->route;
2398
2399         conn->login_family = np->np_sockaddr.ss_family;
2400
2401         conn->login_sockaddr = cm_route->addr.dst_addr;
2402         conn->local_sockaddr = cm_route->addr.src_addr;
2403 }
2404
2405 static int
2406 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2407 {
2408         struct isert_np *isert_np = np->np_context;
2409         struct isert_conn *isert_conn;
2410         int ret;
2411
2412 accept_wait:
2413         ret = down_interruptible(&isert_np->sem);
2414         if (ret)
2415                 return -ENODEV;
2416
2417         spin_lock_bh(&np->np_thread_lock);
2418         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2419                 spin_unlock_bh(&np->np_thread_lock);
2420                 isert_dbg("np_thread_state %d\n",
2421                          np->np_thread_state);
2422                 /**
2423                  * No point in stalling here when np_thread
2424                  * is in state RESET/SHUTDOWN/EXIT - bail
2425                  **/
2426                 return -ENODEV;
2427         }
2428         spin_unlock_bh(&np->np_thread_lock);
2429
2430         mutex_lock(&isert_np->mutex);
2431         if (list_empty(&isert_np->pending)) {
2432                 mutex_unlock(&isert_np->mutex);
2433                 goto accept_wait;
2434         }
2435         isert_conn = list_first_entry(&isert_np->pending,
2436                         struct isert_conn, node);
2437         list_del_init(&isert_conn->node);
2438         mutex_unlock(&isert_np->mutex);
2439
2440         conn->context = isert_conn;
2441         isert_conn->conn = conn;
2442         isert_conn->state = ISER_CONN_BOUND;
2443
2444         isert_set_conn_info(np, conn, isert_conn);
2445
2446         isert_dbg("Processing isert_conn: %p\n", isert_conn);
2447
2448         return 0;
2449 }
2450
2451 static void
2452 isert_free_np(struct iscsi_np *np)
2453 {
2454         struct isert_np *isert_np = np->np_context;
2455         struct isert_conn *isert_conn, *n;
2456
2457         if (isert_np->cm_id)
2458                 rdma_destroy_id(isert_np->cm_id);
2459
2460         /*
2461          * FIXME: At this point we don't have a good way to insure
2462          * that at this point we don't have hanging connections that
2463          * completed RDMA establishment but didn't start iscsi login
2464          * process. So work-around this by cleaning up what ever piled
2465          * up in accepted and pending lists.
2466          */
2467         mutex_lock(&isert_np->mutex);
2468         if (!list_empty(&isert_np->pending)) {
2469                 isert_info("Still have isert pending connections\n");
2470                 list_for_each_entry_safe(isert_conn, n,
2471                                          &isert_np->pending,
2472                                          node) {
2473                         isert_info("cleaning isert_conn %p state (%d)\n",
2474                                    isert_conn, isert_conn->state);
2475                         isert_connect_release(isert_conn);
2476                 }
2477         }
2478
2479         if (!list_empty(&isert_np->accepted)) {
2480                 isert_info("Still have isert accepted connections\n");
2481                 list_for_each_entry_safe(isert_conn, n,
2482                                          &isert_np->accepted,
2483                                          node) {
2484                         isert_info("cleaning isert_conn %p state (%d)\n",
2485                                    isert_conn, isert_conn->state);
2486                         isert_connect_release(isert_conn);
2487                 }
2488         }
2489         mutex_unlock(&isert_np->mutex);
2490
2491         np->np_context = NULL;
2492         kfree(isert_np);
2493 }
2494
2495 static void isert_release_work(struct work_struct *work)
2496 {
2497         struct isert_conn *isert_conn = container_of(work,
2498                                                      struct isert_conn,
2499                                                      release_work);
2500
2501         isert_info("Starting release conn %p\n", isert_conn);
2502
2503         mutex_lock(&isert_conn->mutex);
2504         isert_conn->state = ISER_CONN_DOWN;
2505         mutex_unlock(&isert_conn->mutex);
2506
2507         isert_info("Destroying conn %p\n", isert_conn);
2508         isert_put_conn(isert_conn);
2509 }
2510
2511 static void
2512 isert_wait4logout(struct isert_conn *isert_conn)
2513 {
2514         struct iscsi_conn *conn = isert_conn->conn;
2515
2516         isert_info("conn %p\n", isert_conn);
2517
2518         if (isert_conn->logout_posted) {
2519                 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2520                 wait_for_completion_timeout(&conn->conn_logout_comp,
2521                                             SECONDS_FOR_LOGOUT_COMP * HZ);
2522         }
2523 }
2524
2525 static void
2526 isert_wait4cmds(struct iscsi_conn *conn)
2527 {
2528         isert_info("iscsi_conn %p\n", conn);
2529
2530         if (conn->sess) {
2531                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2532                 target_wait_for_sess_cmds(conn->sess->se_sess);
2533         }
2534 }
2535
2536 /**
2537  * isert_put_unsol_pending_cmds() - Drop commands waiting for
2538  *     unsolicitate dataout
2539  * @conn:    iscsi connection
2540  *
2541  * We might still have commands that are waiting for unsolicited
2542  * dataouts messages. We must put the extra reference on those
2543  * before blocking on the target_wait_for_session_cmds
2544  */
2545 static void
2546 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
2547 {
2548         struct iscsi_cmd *cmd, *tmp;
2549         static LIST_HEAD(drop_cmd_list);
2550
2551         spin_lock_bh(&conn->cmd_lock);
2552         list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2553                 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2554                     (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2555                     (cmd->write_data_done < cmd->se_cmd.data_length))
2556                         list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2557         }
2558         spin_unlock_bh(&conn->cmd_lock);
2559
2560         list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2561                 list_del_init(&cmd->i_conn_node);
2562                 if (cmd->i_state != ISTATE_REMOVE) {
2563                         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2564
2565                         isert_info("conn %p dropping cmd %p\n", conn, cmd);
2566                         isert_put_cmd(isert_cmd, true);
2567                 }
2568         }
2569 }
2570
2571 static void isert_wait_conn(struct iscsi_conn *conn)
2572 {
2573         struct isert_conn *isert_conn = conn->context;
2574
2575         isert_info("Starting conn %p\n", isert_conn);
2576
2577         mutex_lock(&isert_conn->mutex);
2578         isert_conn_terminate(isert_conn);
2579         mutex_unlock(&isert_conn->mutex);
2580
2581         ib_drain_qp(isert_conn->qp);
2582         isert_put_unsol_pending_cmds(conn);
2583         isert_wait4cmds(conn);
2584         isert_wait4logout(isert_conn);
2585
2586         queue_work(isert_release_wq, &isert_conn->release_work);
2587 }
2588
2589 static void isert_free_conn(struct iscsi_conn *conn)
2590 {
2591         struct isert_conn *isert_conn = conn->context;
2592
2593         ib_drain_qp(isert_conn->qp);
2594         isert_put_conn(isert_conn);
2595 }
2596
2597 static void isert_get_rx_pdu(struct iscsi_conn *conn)
2598 {
2599         struct completion comp;
2600
2601         init_completion(&comp);
2602
2603         wait_for_completion_interruptible(&comp);
2604 }
2605
2606 static struct iscsit_transport iser_target_transport = {
2607         .name                   = "IB/iSER",
2608         .transport_type         = ISCSI_INFINIBAND,
2609         .rdma_shutdown          = true,
2610         .priv_size              = sizeof(struct isert_cmd),
2611         .owner                  = THIS_MODULE,
2612         .iscsit_setup_np        = isert_setup_np,
2613         .iscsit_accept_np       = isert_accept_np,
2614         .iscsit_free_np         = isert_free_np,
2615         .iscsit_wait_conn       = isert_wait_conn,
2616         .iscsit_free_conn       = isert_free_conn,
2617         .iscsit_get_login_rx    = isert_get_login_rx,
2618         .iscsit_put_login_tx    = isert_put_login_tx,
2619         .iscsit_immediate_queue = isert_immediate_queue,
2620         .iscsit_response_queue  = isert_response_queue,
2621         .iscsit_get_dataout     = isert_get_dataout,
2622         .iscsit_queue_data_in   = isert_put_datain,
2623         .iscsit_queue_status    = isert_put_response,
2624         .iscsit_aborted_task    = isert_aborted_task,
2625         .iscsit_get_rx_pdu      = isert_get_rx_pdu,
2626         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2627 };
2628
2629 static int __init isert_init(void)
2630 {
2631         int ret;
2632
2633         isert_comp_wq = alloc_workqueue("isert_comp_wq",
2634                                         WQ_UNBOUND | WQ_HIGHPRI, 0);
2635         if (!isert_comp_wq) {
2636                 isert_err("Unable to allocate isert_comp_wq\n");
2637                 ret = -ENOMEM;
2638                 return -ENOMEM;
2639         }
2640
2641         isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2642                                         WQ_UNBOUND_MAX_ACTIVE);
2643         if (!isert_release_wq) {
2644                 isert_err("Unable to allocate isert_release_wq\n");
2645                 ret = -ENOMEM;
2646                 goto destroy_comp_wq;
2647         }
2648
2649         iscsit_register_transport(&iser_target_transport);
2650         isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2651
2652         return 0;
2653
2654 destroy_comp_wq:
2655         destroy_workqueue(isert_comp_wq);
2656
2657         return ret;
2658 }
2659
2660 static void __exit isert_exit(void)
2661 {
2662         flush_scheduled_work();
2663         destroy_workqueue(isert_release_wq);
2664         destroy_workqueue(isert_comp_wq);
2665         iscsit_unregister_transport(&iser_target_transport);
2666         isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2667 }
2668
2669 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2670 MODULE_VERSION("1.0");
2671 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2672 MODULE_LICENSE("GPL");
2673
2674 module_init(isert_init);
2675 module_exit(isert_exit);