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 = kcalloc(ISERT_QP_MAX_RECV_DTOS,
 185                                        sizeof(struct iser_rx_desc),
 186                                        GFP_KERNEL);
 187         if (!isert_conn->rx_descs)
 188                 return -ENOMEM;
 189
 190         rx_desc = isert_conn->rx_descs;
 191
 192         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 193                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 194                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 195                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 196                         goto dma_map_fail;
 197
 198                 rx_desc->dma_addr = dma_addr;
 199
 200                 rx_sg = &rx_desc->rx_sg;
 201                 rx_sg->addr = rx_desc->dma_addr;
 202                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 203                 rx_sg->lkey = device->pd->local_dma_lkey;
 204                 rx_desc->rx_cqe.done = isert_recv_done;
 205         }
 206
 207         return 0;
 208
 209 dma_map_fail:
 210         rx_desc = isert_conn->rx_descs;
 211         for (j = 0; j < i; j++, rx_desc++) {
 212                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 213                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 214         }
 215         kfree(isert_conn->rx_descs);
 216         isert_conn->rx_descs = NULL;
 217         isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
 218         return -ENOMEM;
 219 }
 220
 221 static void
 222 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 223 {
 224         struct ib_device *ib_dev = isert_conn->device->ib_device;
 225         struct iser_rx_desc *rx_desc;
 226         int i;
 227
 228         if (!isert_conn->rx_descs)
 229                 return;
 230
 231         rx_desc = isert_conn->rx_descs;
 232         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 233                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 234                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 235         }
 236
 237         kfree(isert_conn->rx_descs);
 238         isert_conn->rx_descs = NULL;
 239 }
 240
 241 static void
 242 isert_free_comps(struct isert_device *device)
 243 {
 244         int i;
 245
 246         for (i = 0; i < device->comps_used; i++) {
 247                 struct isert_comp *comp = &device->comps[i];
 248
 249                 if (comp->cq)
 250                         ib_free_cq(comp->cq);
 251         }
 252         kfree(device->comps);
 253 }
 254
 255 static int
 256 isert_alloc_comps(struct isert_device *device)
 257 {
 258         int i, max_cqe, ret = 0;
 259
 260         device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
 261                                  device->ib_device->num_comp_vectors));
 262
 263         isert_info("Using %d CQs, %s supports %d vectors support "
 264                    "pi_capable %d\n",
 265                    device->comps_used, device->ib_device->name,
 266                    device->ib_device->num_comp_vectors,
 267                    device->pi_capable);
 268
 269         device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
 270                                 GFP_KERNEL);
 271         if (!device->comps)
 272                 return -ENOMEM;
 273
 274         max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
 275
 276         for (i = 0; i < device->comps_used; i++) {
 277                 struct isert_comp *comp = &device->comps[i];
 278
 279                 comp->device = device;
 280                 comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i,
 281                                 IB_POLL_WORKQUEUE);
 282                 if (IS_ERR(comp->cq)) {
 283                         isert_err("Unable to allocate cq\n");
 284                         ret = PTR_ERR(comp->cq);
 285                         comp->cq = NULL;
 286                         goto out_cq;
 287                 }
 288         }
 289
 290         return 0;
 291 out_cq:
 292         isert_free_comps(device);
 293         return ret;
 294 }
 295
 296 static int
 297 isert_create_device_ib_res(struct isert_device *device)
 298 {
 299         struct ib_device *ib_dev = device->ib_device;
 300         int ret;
 301
 302         isert_dbg("devattr->max_sge: %d\n", ib_dev->attrs.max_sge);
 303         isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
 304
 305         ret = isert_alloc_comps(device);
 306         if (ret)
 307                 goto out;
 308
 309         device->pd = ib_alloc_pd(ib_dev, 0);
 310         if (IS_ERR(device->pd)) {
 311                 ret = PTR_ERR(device->pd);
 312                 isert_err("failed to allocate pd, device %p, ret=%d\n",
 313                           device, ret);
 314                 goto out_cq;
 315         }
 316
 317         /* Check signature cap */
 318         device->pi_capable = ib_dev->attrs.device_cap_flags &
 319                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 320
 321         return 0;
 322
 323 out_cq:
 324         isert_free_comps(device);
 325 out:
 326         if (ret > 0)
 327                 ret = -EINVAL;
 328         return ret;
 329 }
 330
 331 static void
 332 isert_free_device_ib_res(struct isert_device *device)
 333 {
 334         isert_info("device %p\n", device);
 335
 336         ib_dealloc_pd(device->pd);
 337         isert_free_comps(device);
 338 }
 339
 340 static void
 341 isert_device_put(struct isert_device *device)
 342 {
 343         mutex_lock(&device_list_mutex);
 344         device->refcount--;
 345         isert_info("device %p refcount %d\n", device, device->refcount);
 346         if (!device->refcount) {
 347                 isert_free_device_ib_res(device);
 348                 list_del(&device->dev_node);
 349                 kfree(device);
 350         }
 351         mutex_unlock(&device_list_mutex);
 352 }
 353
 354 static struct isert_device *
 355 isert_device_get(struct rdma_cm_id *cma_id)
 356 {
 357         struct isert_device *device;
 358         int ret;
 359
 360         mutex_lock(&device_list_mutex);
 361         list_for_each_entry(device, &device_list, dev_node) {
 362                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 363                         device->refcount++;
 364                         isert_info("Found iser device %p refcount %d\n",
 365                                    device, device->refcount);
 366                         mutex_unlock(&device_list_mutex);
 367                         return device;
 368                 }
 369         }
 370
 371         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 372         if (!device) {
 373                 mutex_unlock(&device_list_mutex);
 374                 return ERR_PTR(-ENOMEM);
 375         }
 376
 377         INIT_LIST_HEAD(&device->dev_node);
 378
 379         device->ib_device = cma_id->device;
 380         ret = isert_create_device_ib_res(device);
 381         if (ret) {
 382                 kfree(device);
 383                 mutex_unlock(&device_list_mutex);
 384                 return ERR_PTR(ret);
 385         }
 386
 387         device->refcount++;
 388         list_add_tail(&device->dev_node, &device_list);
 389         isert_info("Created a new iser device %p refcount %d\n",
 390                    device, device->refcount);
 391         mutex_unlock(&device_list_mutex);
 392
 393         return device;
 394 }
 395
 396 static void
 397 isert_init_conn(struct isert_conn *isert_conn)
 398 {
 399         isert_conn->state = ISER_CONN_INIT;
 400         INIT_LIST_HEAD(&isert_conn->node);
 401         init_completion(&isert_conn->login_comp);
 402         init_completion(&isert_conn->login_req_comp);
 403         init_waitqueue_head(&isert_conn->rem_wait);
 404         kref_init(&isert_conn->kref);
 405         mutex_init(&isert_conn->mutex);
 406         INIT_WORK(&isert_conn->release_work, isert_release_work);
 407 }
 408
 409 static void
 410 isert_free_login_buf(struct isert_conn *isert_conn)
 411 {
 412         struct ib_device *ib_dev = isert_conn->device->ib_device;
 413
 414         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 415                             ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
 416         kfree(isert_conn->login_rsp_buf);
 417
 418         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 419                             ISER_RX_PAYLOAD_SIZE,
 420                             DMA_FROM_DEVICE);
 421         kfree(isert_conn->login_req_buf);
 422 }
 423
 424 static int
 425 isert_alloc_login_buf(struct isert_conn *isert_conn,
 426                       struct ib_device *ib_dev)
 427 {
 428         int ret;
 429
 430         isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
 431                         GFP_KERNEL);
 432         if (!isert_conn->login_req_buf)
 433                 return -ENOMEM;
 434
 435         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 436                                 isert_conn->login_req_buf,
 437                                 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 438         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 439         if (ret) {
 440                 isert_err("login_req_dma mapping error: %d\n", ret);
 441                 isert_conn->login_req_dma = 0;
 442                 goto out_free_login_req_buf;
 443         }
 444
 445         isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
 446         if (!isert_conn->login_rsp_buf) {
 447                 ret = -ENOMEM;
 448                 goto out_unmap_login_req_buf;
 449         }
 450
 451         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 452                                         isert_conn->login_rsp_buf,
 453                                         ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
 454         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 455         if (ret) {
 456                 isert_err("login_rsp_dma mapping error: %d\n", ret);
 457                 isert_conn->login_rsp_dma = 0;
 458                 goto out_free_login_rsp_buf;
 459         }
 460
 461         return 0;
 462
 463 out_free_login_rsp_buf:
 464         kfree(isert_conn->login_rsp_buf);
 465 out_unmap_login_req_buf:
 466         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 467                             ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 468 out_free_login_req_buf:
 469         kfree(isert_conn->login_req_buf);
 470         return ret;
 471 }
 472
 473 static void
 474 isert_set_nego_params(struct isert_conn *isert_conn,
 475                       struct rdma_conn_param *param)
 476 {
 477         struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
 478
 479         /* Set max inflight RDMA READ requests */
 480         isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
 481                                 attr->max_qp_init_rd_atom);
 482         isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
 483
 484         if (param->private_data) {
 485                 u8 flags = *(u8 *)param->private_data;
 486
 487                 /*
 488                  * use remote invalidation if the both initiator
 489                  * and the HCA support it
 490                  */
 491                 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
 492                                           (attr->device_cap_flags &
 493                                            IB_DEVICE_MEM_MGT_EXTENSIONS);
 494                 if (isert_conn->snd_w_inv)
 495                         isert_info("Using remote invalidation\n");
 496         }
 497 }
 498
 499 static int
 500 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 501 {
 502         struct isert_np *isert_np = cma_id->context;
 503         struct iscsi_np *np = isert_np->np;
 504         struct isert_conn *isert_conn;
 505         struct isert_device *device;
 506         int ret = 0;
 507
 508         spin_lock_bh(&np->np_thread_lock);
 509         if (!np->enabled) {
 510                 spin_unlock_bh(&np->np_thread_lock);
 511                 isert_dbg("iscsi_np is not enabled, reject connect request\n");
 512                 return rdma_reject(cma_id, NULL, 0);
 513         }
 514         spin_unlock_bh(&np->np_thread_lock);
 515
 516         isert_dbg("cma_id: %p, portal: %p\n",
 517                  cma_id, cma_id->context);
 518
 519         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 520         if (!isert_conn)
 521                 return -ENOMEM;
 522
 523         isert_init_conn(isert_conn);
 524         isert_conn->cm_id = cma_id;
 525
 526         ret = isert_alloc_login_buf(isert_conn, cma_id->device);
 527         if (ret)
 528                 goto out;
 529
 530         device = isert_device_get(cma_id);
 531         if (IS_ERR(device)) {
 532                 ret = PTR_ERR(device);
 533                 goto out_rsp_dma_map;
 534         }
 535         isert_conn->device = device;
 536
 537         isert_set_nego_params(isert_conn, &event->param.conn);
 538
 539         ret = isert_conn_setup_qp(isert_conn, cma_id);
 540         if (ret)
 541                 goto out_conn_dev;
 542
 543         ret = isert_login_post_recv(isert_conn);
 544         if (ret)
 545                 goto out_conn_dev;
 546
 547         ret = isert_rdma_accept(isert_conn);
 548         if (ret)
 549                 goto out_conn_dev;
 550
 551         mutex_lock(&isert_np->mutex);
 552         list_add_tail(&isert_conn->node, &isert_np->accepted);
 553         mutex_unlock(&isert_np->mutex);
 554
 555         return 0;
 556
 557 out_conn_dev:
 558         isert_device_put(device);
 559 out_rsp_dma_map:
 560         isert_free_login_buf(isert_conn);
 561 out:
 562         kfree(isert_conn);
 563         rdma_reject(cma_id, NULL, 0);
 564         return ret;
 565 }
 566
 567 static void
 568 isert_connect_release(struct isert_conn *isert_conn)
 569 {
 570         struct isert_device *device = isert_conn->device;
 571
 572         isert_dbg("conn %p\n", isert_conn);
 573
 574         BUG_ON(!device);
 575
 576         isert_free_rx_descriptors(isert_conn);
 577         if (isert_conn->cm_id &&
 578             !isert_conn->dev_removed)
 579                 rdma_destroy_id(isert_conn->cm_id);
 580
 581         if (isert_conn->qp) {
 582                 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
 583
 584                 isert_comp_put(comp);
 585                 ib_destroy_qp(isert_conn->qp);
 586         }
 587
 588         if (isert_conn->login_req_buf)
 589                 isert_free_login_buf(isert_conn);
 590
 591         isert_device_put(device);
 592
 593         if (isert_conn->dev_removed)
 594                 wake_up_interruptible(&isert_conn->rem_wait);
 595         else
 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 terminating 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         ib_drain_qp(isert_conn->qp);
 746         list_del_init(&isert_conn->node);
 747         isert_conn->cm_id = NULL;
 748         isert_put_conn(isert_conn);
 749
 750         return -1;
 751 }
 752
 753 static int
 754 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 755 {
 756         struct isert_np *isert_np = cma_id->context;
 757         struct isert_conn *isert_conn;
 758         int ret = 0;
 759
 760         isert_info("%s (%d): status %d id %p np %p\n",
 761                    rdma_event_msg(event->event), event->event,
 762                    event->status, cma_id, cma_id->context);
 763
 764         if (isert_np->cm_id == cma_id)
 765                 return isert_np_cma_handler(cma_id->context, event->event);
 766
 767         switch (event->event) {
 768         case RDMA_CM_EVENT_CONNECT_REQUEST:
 769                 ret = isert_connect_request(cma_id, event);
 770                 if (ret)
 771                         isert_err("failed handle connect request %d\n", ret);
 772                 break;
 773         case RDMA_CM_EVENT_ESTABLISHED:
 774                 isert_connected_handler(cma_id);
 775                 break;
 776         case RDMA_CM_EVENT_ADDR_CHANGE:    /* FALLTHRU */
 777         case RDMA_CM_EVENT_DISCONNECTED:   /* FALLTHRU */
 778         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
 779                 ret = isert_disconnected_handler(cma_id, event->event);
 780                 break;
 781         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 782                 isert_conn = cma_id->qp->qp_context;
 783                 isert_conn->dev_removed = true;
 784                 isert_disconnected_handler(cma_id, event->event);
 785                 wait_event_interruptible(isert_conn->rem_wait,
 786                                          isert_conn->state == ISER_CONN_DOWN);
 787                 kfree(isert_conn);
 788                 /*
 789                  * return non-zero from the callback to destroy
 790                  * the rdma cm id
 791                  */
 792                 return 1;
 793         case RDMA_CM_EVENT_REJECTED:
 794                 isert_info("Connection rejected: %s\n",
 795                            rdma_reject_msg(cma_id, event->status));
 796                 /* fall through */
 797         case RDMA_CM_EVENT_UNREACHABLE:
 798         case RDMA_CM_EVENT_CONNECT_ERROR:
 799                 ret = isert_connect_error(cma_id);
 800                 break;
 801         default:
 802                 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
 803                 break;
 804         }
 805
 806         return ret;
 807 }
 808
 809 static int
 810 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
 811 {
 812         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 813         int i, ret;
 814         struct iser_rx_desc *rx_desc;
 815
 816         for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
 817                 rx_desc = &isert_conn->rx_descs[i];
 818
 819                 rx_wr->wr_cqe = &rx_desc->rx_cqe;
 820                 rx_wr->sg_list = &rx_desc->rx_sg;
 821                 rx_wr->num_sge = 1;
 822                 rx_wr->next = rx_wr + 1;
 823                 rx_desc->in_use = false;
 824         }
 825         rx_wr--;
 826         rx_wr->next = NULL; /* mark end of work requests list */
 827
 828         ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
 829                            &rx_wr_failed);
 830         if (ret)
 831                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 832
 833         return ret;
 834 }
 835
 836 static int
 837 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
 838 {
 839         struct ib_recv_wr *rx_wr_failed, rx_wr;
 840         int ret;
 841
 842         if (!rx_desc->in_use) {
 843                 /*
 844                  * if the descriptor is not in-use we already reposted it
 845                  * for recv, so just silently return
 846                  */
 847                 return 0;
 848         }
 849
 850         rx_desc->in_use = false;
 851         rx_wr.wr_cqe = &rx_desc->rx_cqe;
 852         rx_wr.sg_list = &rx_desc->rx_sg;
 853         rx_wr.num_sge = 1;
 854         rx_wr.next = NULL;
 855
 856         ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
 857         if (ret)
 858                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 859
 860         return ret;
 861 }
 862
 863 static int
 864 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 865 {
 866         struct ib_device *ib_dev = isert_conn->cm_id->device;
 867         struct ib_send_wr send_wr, *send_wr_failed;
 868         int ret;
 869
 870         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 871                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 872
 873         tx_desc->tx_cqe.done = isert_login_send_done;
 874
 875         send_wr.next    = NULL;
 876         send_wr.wr_cqe  = &tx_desc->tx_cqe;
 877         send_wr.sg_list = tx_desc->tx_sg;
 878         send_wr.num_sge = tx_desc->num_sge;
 879         send_wr.opcode  = IB_WR_SEND;
 880         send_wr.send_flags = IB_SEND_SIGNALED;
 881
 882         ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
 883         if (ret)
 884                 isert_err("ib_post_send() failed, ret: %d\n", ret);
 885
 886         return ret;
 887 }
 888
 889 static void
 890 __isert_create_send_desc(struct isert_device *device,
 891                          struct iser_tx_desc *tx_desc)
 892 {
 893
 894         memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
 895         tx_desc->iser_header.flags = ISCSI_CTRL;
 896
 897         tx_desc->num_sge = 1;
 898
 899         if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
 900                 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
 901                 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 902         }
 903 }
 904
 905 static void
 906 isert_create_send_desc(struct isert_conn *isert_conn,
 907                        struct isert_cmd *isert_cmd,
 908                        struct iser_tx_desc *tx_desc)
 909 {
 910         struct isert_device *device = isert_conn->device;
 911         struct ib_device *ib_dev = device->ib_device;
 912
 913         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 914                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 915
 916         __isert_create_send_desc(device, tx_desc);
 917 }
 918
 919 static int
 920 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 921                    struct iser_tx_desc *tx_desc)
 922 {
 923         struct isert_device *device = isert_conn->device;
 924         struct ib_device *ib_dev = device->ib_device;
 925         u64 dma_addr;
 926
 927         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 928                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 929         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 930                 isert_err("ib_dma_mapping_error() failed\n");
 931                 return -ENOMEM;
 932         }
 933
 934         tx_desc->dma_addr = dma_addr;
 935         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 936         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 937         tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
 938
 939         isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
 940                   tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
 941                   tx_desc->tx_sg[0].lkey);
 942
 943         return 0;
 944 }
 945
 946 static void
 947 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 948                    struct ib_send_wr *send_wr)
 949 {
 950         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 951
 952         tx_desc->tx_cqe.done = isert_send_done;
 953         send_wr->wr_cqe = &tx_desc->tx_cqe;
 954
 955         if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
 956                 send_wr->opcode  = IB_WR_SEND_WITH_INV;
 957                 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
 958         } else {
 959                 send_wr->opcode = IB_WR_SEND;
 960         }
 961
 962         send_wr->sg_list = &tx_desc->tx_sg[0];
 963         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 964         send_wr->send_flags = IB_SEND_SIGNALED;
 965 }
 966
 967 static int
 968 isert_login_post_recv(struct isert_conn *isert_conn)
 969 {
 970         struct ib_recv_wr rx_wr, *rx_wr_fail;
 971         struct ib_sge sge;
 972         int ret;
 973
 974         memset(&sge, 0, sizeof(struct ib_sge));
 975         sge.addr = isert_conn->login_req_dma;
 976         sge.length = ISER_RX_PAYLOAD_SIZE;
 977         sge.lkey = isert_conn->device->pd->local_dma_lkey;
 978
 979         isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
 980                 sge.addr, sge.length, sge.lkey);
 981
 982         isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
 983
 984         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
 985         rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
 986         rx_wr.sg_list = &sge;
 987         rx_wr.num_sge = 1;
 988
 989         ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
 990         if (ret)
 991                 isert_err("ib_post_recv() failed: %d\n", ret);
 992
 993         return ret;
 994 }
 995
 996 static int
 997 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
 998                    u32 length)
 999 {
1000         struct isert_conn *isert_conn = conn->context;
1001         struct isert_device *device = isert_conn->device;
1002         struct ib_device *ib_dev = device->ib_device;
1003         struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
1004         int ret;
1005
1006         __isert_create_send_desc(device, tx_desc);
1007
1008         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1009                sizeof(struct iscsi_hdr));
1010
1011         isert_init_tx_hdrs(isert_conn, tx_desc);
1012
1013         if (length > 0) {
1014                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1015
1016                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1017                                            length, DMA_TO_DEVICE);
1018
1019                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1020
1021                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1022                                               length, DMA_TO_DEVICE);
1023
1024                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1025                 tx_dsg->length  = length;
1026                 tx_dsg->lkey    = isert_conn->device->pd->local_dma_lkey;
1027                 tx_desc->num_sge = 2;
1028         }
1029         if (!login->login_failed) {
1030                 if (login->login_complete) {
1031                         ret = isert_alloc_rx_descriptors(isert_conn);
1032                         if (ret)
1033                                 return ret;
1034
1035                         ret = isert_post_recvm(isert_conn,
1036                                                ISERT_QP_MAX_RECV_DTOS);
1037                         if (ret)
1038                                 return ret;
1039
1040                         /* Now we are in FULL_FEATURE phase */
1041                         mutex_lock(&isert_conn->mutex);
1042                         isert_conn->state = ISER_CONN_FULL_FEATURE;
1043                         mutex_unlock(&isert_conn->mutex);
1044                         goto post_send;
1045                 }
1046
1047                 ret = isert_login_post_recv(isert_conn);
1048                 if (ret)
1049                         return ret;
1050         }
1051 post_send:
1052         ret = isert_login_post_send(isert_conn, tx_desc);
1053         if (ret)
1054                 return ret;
1055
1056         return 0;
1057 }
1058
1059 static void
1060 isert_rx_login_req(struct isert_conn *isert_conn)
1061 {
1062         struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1063         int rx_buflen = isert_conn->login_req_len;
1064         struct iscsi_conn *conn = isert_conn->conn;
1065         struct iscsi_login *login = conn->conn_login;
1066         int size;
1067
1068         isert_info("conn %p\n", isert_conn);
1069
1070         WARN_ON_ONCE(!login);
1071
1072         if (login->first_request) {
1073                 struct iscsi_login_req *login_req =
1074                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1075                 /*
1076                  * Setup the initial iscsi_login values from the leading
1077                  * login request PDU.
1078                  */
1079                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1080                 login->current_stage =
1081                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1082                          >> 2;
1083                 login->version_min      = login_req->min_version;
1084                 login->version_max      = login_req->max_version;
1085                 memcpy(login->isid, login_req->isid, 6);
1086                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1087                 login->init_task_tag    = login_req->itt;
1088                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1089                 login->cid              = be16_to_cpu(login_req->cid);
1090                 login->tsih             = be16_to_cpu(login_req->tsih);
1091         }
1092
1093         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1094
1095         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1096         isert_dbg("Using login payload size: %d, rx_buflen: %d "
1097                   "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1098                   MAX_KEY_VALUE_PAIRS);
1099         memcpy(login->req_buf, &rx_desc->data[0], size);
1100
1101         if (login->first_request) {
1102                 complete(&isert_conn->login_comp);
1103                 return;
1104         }
1105         schedule_delayed_work(&conn->login_work, 0);
1106 }
1107
1108 static struct iscsi_cmd
1109 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1110 {
1111         struct isert_conn *isert_conn = conn->context;
1112         struct isert_cmd *isert_cmd;
1113         struct iscsi_cmd *cmd;
1114
1115         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1116         if (!cmd) {
1117                 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1118                 return NULL;
1119         }
1120         isert_cmd = iscsit_priv_cmd(cmd);
1121         isert_cmd->conn = isert_conn;
1122         isert_cmd->iscsi_cmd = cmd;
1123         isert_cmd->rx_desc = rx_desc;
1124
1125         return cmd;
1126 }
1127
1128 static int
1129 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1130                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1131                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1132 {
1133         struct iscsi_conn *conn = isert_conn->conn;
1134         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1135         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1136         bool dump_payload = false;
1137         unsigned int data_len;
1138
1139         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1140         if (rc < 0)
1141                 return rc;
1142
1143         imm_data = cmd->immediate_data;
1144         imm_data_len = cmd->first_burst_len;
1145         unsol_data = cmd->unsolicited_data;
1146         data_len = cmd->se_cmd.data_length;
1147
1148         if (imm_data && imm_data_len == data_len)
1149                 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1150         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1151         if (rc < 0) {
1152                 return 0;
1153         } else if (rc > 0) {
1154                 dump_payload = true;
1155                 goto sequence_cmd;
1156         }
1157
1158         if (!imm_data)
1159                 return 0;
1160
1161         if (imm_data_len != data_len) {
1162                 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1163                 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1164                                     &rx_desc->data[0], imm_data_len);
1165                 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1166                           sg_nents, imm_data_len);
1167         } else {
1168                 sg_init_table(&isert_cmd->sg, 1);
1169                 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1170                 cmd->se_cmd.t_data_nents = 1;
1171                 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1172                 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1173                           imm_data_len);
1174         }
1175
1176         cmd->write_data_done += imm_data_len;
1177
1178         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1179                 spin_lock_bh(&cmd->istate_lock);
1180                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1181                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1182                 spin_unlock_bh(&cmd->istate_lock);
1183         }
1184
1185 sequence_cmd:
1186         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1187
1188         if (!rc && dump_payload == false && unsol_data)
1189                 iscsit_set_unsoliticed_dataout(cmd);
1190         else if (dump_payload && imm_data)
1191                 target_put_sess_cmd(&cmd->se_cmd);
1192
1193         return 0;
1194 }
1195
1196 static int
1197 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1198                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1199 {
1200         struct scatterlist *sg_start;
1201         struct iscsi_conn *conn = isert_conn->conn;
1202         struct iscsi_cmd *cmd = NULL;
1203         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1204         u32 unsol_data_len = ntoh24(hdr->dlength);
1205         int rc, sg_nents, sg_off, page_off;
1206
1207         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1208         if (rc < 0)
1209                 return rc;
1210         else if (!cmd)
1211                 return 0;
1212         /*
1213          * FIXME: Unexpected unsolicited_data out
1214          */
1215         if (!cmd->unsolicited_data) {
1216                 isert_err("Received unexpected solicited data payload\n");
1217                 dump_stack();
1218                 return -1;
1219         }
1220
1221         isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1222                   "write_data_done: %u, data_length: %u\n",
1223                   unsol_data_len,  cmd->write_data_done,
1224                   cmd->se_cmd.data_length);
1225
1226         sg_off = cmd->write_data_done / PAGE_SIZE;
1227         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1228         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1229         page_off = cmd->write_data_done % PAGE_SIZE;
1230         /*
1231          * FIXME: Non page-aligned unsolicited_data out
1232          */
1233         if (page_off) {
1234                 isert_err("unexpected non-page aligned data payload\n");
1235                 dump_stack();
1236                 return -1;
1237         }
1238         isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1239                   "sg_nents: %u from %p %u\n", sg_start, sg_off,
1240                   sg_nents, &rx_desc->data[0], unsol_data_len);
1241
1242         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1243                             unsol_data_len);
1244
1245         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1246         if (rc < 0)
1247                 return rc;
1248
1249         /*
1250          * multiple data-outs on the same command can arrive -
1251          * so post the buffer before hand
1252          */
1253         rc = isert_post_recv(isert_conn, rx_desc);
1254         if (rc) {
1255                 isert_err("ib_post_recv failed with %d\n", rc);
1256                 return rc;
1257         }
1258         return 0;
1259 }
1260
1261 static int
1262 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1263                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1264                      unsigned char *buf)
1265 {
1266         struct iscsi_conn *conn = isert_conn->conn;
1267         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1268         int rc;
1269
1270         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1271         if (rc < 0)
1272                 return rc;
1273         /*
1274          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1275          */
1276
1277         return iscsit_process_nop_out(conn, cmd, hdr);
1278 }
1279
1280 static int
1281 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1282                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1283                       struct iscsi_text *hdr)
1284 {
1285         struct iscsi_conn *conn = isert_conn->conn;
1286         u32 payload_length = ntoh24(hdr->dlength);
1287         int rc;
1288         unsigned char *text_in = NULL;
1289
1290         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1291         if (rc < 0)
1292                 return rc;
1293
1294         if (payload_length) {
1295                 text_in = kzalloc(payload_length, GFP_KERNEL);
1296                 if (!text_in)
1297                         return -ENOMEM;
1298         }
1299         cmd->text_in_ptr = text_in;
1300
1301         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1302
1303         return iscsit_process_text_cmd(conn, cmd, hdr);
1304 }
1305
1306 static int
1307 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1308                 uint32_t read_stag, uint64_t read_va,
1309                 uint32_t write_stag, uint64_t write_va)
1310 {
1311         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1312         struct iscsi_conn *conn = isert_conn->conn;
1313         struct iscsi_cmd *cmd;
1314         struct isert_cmd *isert_cmd;
1315         int ret = -EINVAL;
1316         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1317
1318         if (conn->sess->sess_ops->SessionType &&
1319            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1320                 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1321                           " ignoring\n", opcode);
1322                 return 0;
1323         }
1324
1325         switch (opcode) {
1326         case ISCSI_OP_SCSI_CMD:
1327                 cmd = isert_allocate_cmd(conn, rx_desc);
1328                 if (!cmd)
1329                         break;
1330
1331                 isert_cmd = iscsit_priv_cmd(cmd);
1332                 isert_cmd->read_stag = read_stag;
1333                 isert_cmd->read_va = read_va;
1334                 isert_cmd->write_stag = write_stag;
1335                 isert_cmd->write_va = write_va;
1336                 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1337
1338                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1339                                         rx_desc, (unsigned char *)hdr);
1340                 break;
1341         case ISCSI_OP_NOOP_OUT:
1342                 cmd = isert_allocate_cmd(conn, rx_desc);
1343                 if (!cmd)
1344                         break;
1345
1346                 isert_cmd = iscsit_priv_cmd(cmd);
1347                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1348                                            rx_desc, (unsigned char *)hdr);
1349                 break;
1350         case ISCSI_OP_SCSI_DATA_OUT:
1351                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1352                                                 (unsigned char *)hdr);
1353                 break;
1354         case ISCSI_OP_SCSI_TMFUNC:
1355                 cmd = isert_allocate_cmd(conn, rx_desc);
1356                 if (!cmd)
1357                         break;
1358
1359                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1360                                                 (unsigned char *)hdr);
1361                 break;
1362         case ISCSI_OP_LOGOUT:
1363                 cmd = isert_allocate_cmd(conn, rx_desc);
1364                 if (!cmd)
1365                         break;
1366
1367                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1368                 break;
1369         case ISCSI_OP_TEXT:
1370                 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1371                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1372                 else
1373                         cmd = isert_allocate_cmd(conn, rx_desc);
1374
1375                 if (!cmd)
1376                         break;
1377
1378                 isert_cmd = iscsit_priv_cmd(cmd);
1379                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1380                                             rx_desc, (struct iscsi_text *)hdr);
1381                 break;
1382         default:
1383                 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1384                 dump_stack();
1385                 break;
1386         }
1387
1388         return ret;
1389 }
1390
1391 static void
1392 isert_print_wc(struct ib_wc *wc, const char *type)
1393 {
1394         if (wc->status != IB_WC_WR_FLUSH_ERR)
1395                 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1396                           ib_wc_status_msg(wc->status), wc->status,
1397                           wc->vendor_err);
1398         else
1399                 isert_dbg("%s failure: %s (%d)\n", type,
1400                           ib_wc_status_msg(wc->status), wc->status);
1401 }
1402
1403 static void
1404 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1405 {
1406         struct isert_conn *isert_conn = wc->qp->qp_context;
1407         struct ib_device *ib_dev = isert_conn->cm_id->device;
1408         struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1409         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1410         struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1411         uint64_t read_va = 0, write_va = 0;
1412         uint32_t read_stag = 0, write_stag = 0;
1413
1414         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1415                 isert_print_wc(wc, "recv");
1416                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1417                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1418                 return;
1419         }
1420
1421         rx_desc->in_use = true;
1422
1423         ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1424                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1425
1426         isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1427                  rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1428                  (int)(wc->byte_len - ISER_HEADERS_LEN));
1429
1430         switch (iser_ctrl->flags & 0xF0) {
1431         case ISCSI_CTRL:
1432                 if (iser_ctrl->flags & ISER_RSV) {
1433                         read_stag = be32_to_cpu(iser_ctrl->read_stag);
1434                         read_va = be64_to_cpu(iser_ctrl->read_va);
1435                         isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1436                                   read_stag, (unsigned long long)read_va);
1437                 }
1438                 if (iser_ctrl->flags & ISER_WSV) {
1439                         write_stag = be32_to_cpu(iser_ctrl->write_stag);
1440                         write_va = be64_to_cpu(iser_ctrl->write_va);
1441                         isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1442                                   write_stag, (unsigned long long)write_va);
1443                 }
1444
1445                 isert_dbg("ISER ISCSI_CTRL PDU\n");
1446                 break;
1447         case ISER_HELLO:
1448                 isert_err("iSER Hello message\n");
1449                 break;
1450         default:
1451                 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1452                 break;
1453         }
1454
1455         isert_rx_opcode(isert_conn, rx_desc,
1456                         read_stag, read_va, write_stag, write_va);
1457
1458         ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1459                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1460 }
1461
1462 static void
1463 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1464 {
1465         struct isert_conn *isert_conn = wc->qp->qp_context;
1466         struct ib_device *ib_dev = isert_conn->device->ib_device;
1467
1468         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1469                 isert_print_wc(wc, "login recv");
1470                 return;
1471         }
1472
1473         ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1474                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1475
1476         isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1477
1478         if (isert_conn->conn) {
1479                 struct iscsi_login *login = isert_conn->conn->conn_login;
1480
1481                 if (login && !login->first_request)
1482                         isert_rx_login_req(isert_conn);
1483         }
1484
1485         mutex_lock(&isert_conn->mutex);
1486         complete(&isert_conn->login_req_comp);
1487         mutex_unlock(&isert_conn->mutex);
1488
1489         ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1490                                 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1491 }
1492
1493 static void
1494 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1495 {
1496         struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
1497         enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1498
1499         if (!cmd->rw.nr_ops)
1500                 return;
1501
1502         if (isert_prot_cmd(conn, se_cmd)) {
1503                 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1504                                 conn->cm_id->port_num, se_cmd->t_data_sg,
1505                                 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1506                                 se_cmd->t_prot_nents, dir);
1507         } else {
1508                 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1509                                 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1510         }
1511
1512         cmd->rw.nr_ops = 0;
1513 }
1514
1515 static void
1516 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1517 {
1518         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1519         struct isert_conn *isert_conn = isert_cmd->conn;
1520         struct iscsi_conn *conn = isert_conn->conn;
1521         struct iscsi_text_rsp *hdr;
1522
1523         isert_dbg("Cmd %p\n", isert_cmd);
1524
1525         switch (cmd->iscsi_opcode) {
1526         case ISCSI_OP_SCSI_CMD:
1527                 spin_lock_bh(&conn->cmd_lock);
1528                 if (!list_empty(&cmd->i_conn_node))
1529                         list_del_init(&cmd->i_conn_node);
1530                 spin_unlock_bh(&conn->cmd_lock);
1531
1532                 if (cmd->data_direction == DMA_TO_DEVICE) {
1533                         iscsit_stop_dataout_timer(cmd);
1534                         /*
1535                          * Check for special case during comp_err where
1536                          * WRITE_PENDING has been handed off from core,
1537                          * but requires an extra target_put_sess_cmd()
1538                          * before transport_generic_free_cmd() below.
1539                          */
1540                         if (comp_err &&
1541                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1542                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1543
1544                                 target_put_sess_cmd(se_cmd);
1545                         }
1546                 }
1547
1548                 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1549                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1550                 break;
1551         case ISCSI_OP_SCSI_TMFUNC:
1552                 spin_lock_bh(&conn->cmd_lock);
1553                 if (!list_empty(&cmd->i_conn_node))
1554                         list_del_init(&cmd->i_conn_node);
1555                 spin_unlock_bh(&conn->cmd_lock);
1556
1557                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1558                 break;
1559         case ISCSI_OP_REJECT:
1560         case ISCSI_OP_NOOP_OUT:
1561         case ISCSI_OP_TEXT:
1562                 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1563                 /* If the continue bit is on, keep the command alive */
1564                 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1565                         break;
1566
1567                 spin_lock_bh(&conn->cmd_lock);
1568                 if (!list_empty(&cmd->i_conn_node))
1569                         list_del_init(&cmd->i_conn_node);
1570                 spin_unlock_bh(&conn->cmd_lock);
1571
1572                 /*
1573                  * Handle special case for REJECT when iscsi_add_reject*() has
1574                  * overwritten the original iscsi_opcode assignment, and the
1575                  * associated cmd->se_cmd needs to be released.
1576                  */
1577                 if (cmd->se_cmd.se_tfo != NULL) {
1578                         isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1579                                  cmd->iscsi_opcode);
1580                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1581                         break;
1582                 }
1583                 /* fall through */
1584         default:
1585                 iscsit_release_cmd(cmd);
1586                 break;
1587         }
1588 }
1589
1590 static void
1591 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1592 {
1593         if (tx_desc->dma_addr != 0) {
1594                 isert_dbg("unmap single for tx_desc->dma_addr\n");
1595                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1596                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1597                 tx_desc->dma_addr = 0;
1598         }
1599 }
1600
1601 static void
1602 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1603                      struct ib_device *ib_dev, bool comp_err)
1604 {
1605         if (isert_cmd->pdu_buf_dma != 0) {
1606                 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1607                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1608                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1609                 isert_cmd->pdu_buf_dma = 0;
1610         }
1611
1612         isert_unmap_tx_desc(tx_desc, ib_dev);
1613         isert_put_cmd(isert_cmd, comp_err);
1614 }
1615
1616 static int
1617 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1618 {
1619         struct ib_mr_status mr_status;
1620         int ret;
1621
1622         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1623         if (ret) {
1624                 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1625                 goto fail_mr_status;
1626         }
1627
1628         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1629                 u64 sec_offset_err;
1630                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1631
1632                 switch (mr_status.sig_err.err_type) {
1633                 case IB_SIG_BAD_GUARD:
1634                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1635                         break;
1636                 case IB_SIG_BAD_REFTAG:
1637                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1638                         break;
1639                 case IB_SIG_BAD_APPTAG:
1640                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1641                         break;
1642                 }
1643                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1644                 do_div(sec_offset_err, block_size);
1645                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1646
1647                 isert_err("PI error found type %d at sector 0x%llx "
1648                           "expected 0x%x vs actual 0x%x\n",
1649                           mr_status.sig_err.err_type,
1650                           (unsigned long long)se_cmd->bad_sector,
1651                           mr_status.sig_err.expected,
1652                           mr_status.sig_err.actual);
1653                 ret = 1;
1654         }
1655
1656 fail_mr_status:
1657         return ret;
1658 }
1659
1660 static void
1661 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1662 {
1663         struct isert_conn *isert_conn = wc->qp->qp_context;
1664         struct isert_device *device = isert_conn->device;
1665         struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1666         struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1667         struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1668         int ret = 0;
1669
1670         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1671                 isert_print_wc(wc, "rdma write");
1672                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1673                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1674                 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1675                 return;
1676         }
1677
1678         isert_dbg("Cmd %p\n", isert_cmd);
1679
1680         ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr);
1681         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1682
1683         if (ret) {
1684                 /*
1685                  * transport_generic_request_failure() expects to have
1686                  * plus two references to handle queue-full, so re-add
1687                  * one here as target-core will have already dropped
1688                  * it after the first isert_put_datain() callback.
1689                  */
1690                 kref_get(&cmd->cmd_kref);
1691                 transport_generic_request_failure(cmd, cmd->pi_err);
1692         } else {
1693                 /*
1694                  * XXX: isert_put_response() failure is not retried.
1695                  */
1696                 ret = isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1697                 if (ret)
1698                         pr_warn_ratelimited("isert_put_response() ret: %d\n", ret);
1699         }
1700 }
1701
1702 static void
1703 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1704 {
1705         struct isert_conn *isert_conn = wc->qp->qp_context;
1706         struct isert_device *device = isert_conn->device;
1707         struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1708         struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1709         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1710         struct se_cmd *se_cmd = &cmd->se_cmd;
1711         int ret = 0;
1712
1713         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1714                 isert_print_wc(wc, "rdma read");
1715                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1716                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1717                 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1718                 return;
1719         }
1720
1721         isert_dbg("Cmd %p\n", isert_cmd);
1722
1723         iscsit_stop_dataout_timer(cmd);
1724
1725         if (isert_prot_cmd(isert_conn, se_cmd))
1726                 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr);
1727         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1728         cmd->write_data_done = 0;
1729
1730         isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1731         spin_lock_bh(&cmd->istate_lock);
1732         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1733         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1734         spin_unlock_bh(&cmd->istate_lock);
1735
1736         /*
1737          * transport_generic_request_failure() will drop the extra
1738          * se_cmd->cmd_kref reference after T10-PI error, and handle
1739          * any non-zero ->queue_status() callback error retries.
1740          */
1741         if (ret)
1742                 transport_generic_request_failure(se_cmd, se_cmd->pi_err);
1743         else
1744                 target_execute_cmd(se_cmd);
1745 }
1746
1747 static void
1748 isert_do_control_comp(struct work_struct *work)
1749 {
1750         struct isert_cmd *isert_cmd = container_of(work,
1751                         struct isert_cmd, comp_work);
1752         struct isert_conn *isert_conn = isert_cmd->conn;
1753         struct ib_device *ib_dev = isert_conn->cm_id->device;
1754         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1755
1756         isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1757
1758         switch (cmd->i_state) {
1759         case ISTATE_SEND_TASKMGTRSP:
1760                 iscsit_tmr_post_handler(cmd, cmd->conn);
1761                 /* fall through */
1762         case ISTATE_SEND_REJECT:
1763         case ISTATE_SEND_TEXTRSP:
1764                 cmd->i_state = ISTATE_SENT_STATUS;
1765                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1766                                      ib_dev, false);
1767                 break;
1768         case ISTATE_SEND_LOGOUTRSP:
1769                 iscsit_logout_post_handler(cmd, cmd->conn);
1770                 break;
1771         default:
1772                 isert_err("Unknown i_state %d\n", cmd->i_state);
1773                 dump_stack();
1774                 break;
1775         }
1776 }
1777
1778 static void
1779 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1780 {
1781         struct isert_conn *isert_conn = wc->qp->qp_context;
1782         struct ib_device *ib_dev = isert_conn->cm_id->device;
1783         struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1784
1785         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1786                 isert_print_wc(wc, "login send");
1787                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1788                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1789         }
1790
1791         isert_unmap_tx_desc(tx_desc, ib_dev);
1792 }
1793
1794 static void
1795 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1796 {
1797         struct isert_conn *isert_conn = wc->qp->qp_context;
1798         struct ib_device *ib_dev = isert_conn->cm_id->device;
1799         struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1800         struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1801
1802         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1803                 isert_print_wc(wc, "send");
1804                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1805                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1806                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1807                 return;
1808         }
1809
1810         isert_dbg("Cmd %p\n", isert_cmd);
1811
1812         switch (isert_cmd->iscsi_cmd->i_state) {
1813         case ISTATE_SEND_TASKMGTRSP:
1814         case ISTATE_SEND_LOGOUTRSP:
1815         case ISTATE_SEND_REJECT:
1816         case ISTATE_SEND_TEXTRSP:
1817                 isert_unmap_tx_desc(tx_desc, ib_dev);
1818
1819                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1820                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1821                 return;
1822         default:
1823                 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
1824                 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1825                 break;
1826         }
1827 }
1828
1829 static int
1830 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1831 {
1832         struct ib_send_wr *wr_failed;
1833         int ret;
1834
1835         ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1836         if (ret) {
1837                 isert_err("ib_post_recv failed with %d\n", ret);
1838                 return ret;
1839         }
1840
1841         ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
1842                            &wr_failed);
1843         if (ret) {
1844                 isert_err("ib_post_send failed with %d\n", ret);
1845                 return ret;
1846         }
1847         return ret;
1848 }
1849
1850 static int
1851 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1852 {
1853         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1854         struct isert_conn *isert_conn = conn->context;
1855         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1856         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1857                                 &isert_cmd->tx_desc.iscsi_header;
1858
1859         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1860         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1861         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1862         /*
1863          * Attach SENSE DATA payload to iSCSI Response PDU
1864          */
1865         if (cmd->se_cmd.sense_buffer &&
1866             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1867             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1868                 struct isert_device *device = isert_conn->device;
1869                 struct ib_device *ib_dev = device->ib_device;
1870                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1871                 u32 padding, pdu_len;
1872
1873                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1874                                    cmd->sense_buffer);
1875                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1876
1877                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1878                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1879                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1880
1881                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1882                                 (void *)cmd->sense_buffer, pdu_len,
1883                                 DMA_TO_DEVICE);
1884                 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1885                         return -ENOMEM;
1886
1887                 isert_cmd->pdu_buf_len = pdu_len;
1888                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1889                 tx_dsg->length  = pdu_len;
1890                 tx_dsg->lkey    = device->pd->local_dma_lkey;
1891                 isert_cmd->tx_desc.num_sge = 2;
1892         }
1893
1894         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1895
1896         isert_dbg("Posting SCSI Response\n");
1897
1898         return isert_post_response(isert_conn, isert_cmd);
1899 }
1900
1901 static void
1902 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1903 {
1904         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1905         struct isert_conn *isert_conn = conn->context;
1906
1907         spin_lock_bh(&conn->cmd_lock);
1908         if (!list_empty(&cmd->i_conn_node))
1909                 list_del_init(&cmd->i_conn_node);
1910         spin_unlock_bh(&conn->cmd_lock);
1911
1912         if (cmd->data_direction == DMA_TO_DEVICE)
1913                 iscsit_stop_dataout_timer(cmd);
1914         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1915 }
1916
1917 static enum target_prot_op
1918 isert_get_sup_prot_ops(struct iscsi_conn *conn)
1919 {
1920         struct isert_conn *isert_conn = conn->context;
1921         struct isert_device *device = isert_conn->device;
1922
1923         if (conn->tpg->tpg_attrib.t10_pi) {
1924                 if (device->pi_capable) {
1925                         isert_info("conn %p PI offload enabled\n", isert_conn);
1926                         isert_conn->pi_support = true;
1927                         return TARGET_PROT_ALL;
1928                 }
1929         }
1930
1931         isert_info("conn %p PI offload disabled\n", isert_conn);
1932         isert_conn->pi_support = false;
1933
1934         return TARGET_PROT_NORMAL;
1935 }
1936
1937 static int
1938 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1939                 bool nopout_response)
1940 {
1941         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1942         struct isert_conn *isert_conn = conn->context;
1943         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1944
1945         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1946         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1947                                &isert_cmd->tx_desc.iscsi_header,
1948                                nopout_response);
1949         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1950         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1951
1952         isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1953
1954         return isert_post_response(isert_conn, isert_cmd);
1955 }
1956
1957 static int
1958 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1959 {
1960         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1961         struct isert_conn *isert_conn = conn->context;
1962         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1963
1964         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1965         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1966                                 &isert_cmd->tx_desc.iscsi_header);
1967         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1968         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1969
1970         isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1971
1972         return isert_post_response(isert_conn, isert_cmd);
1973 }
1974
1975 static int
1976 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1977 {
1978         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1979         struct isert_conn *isert_conn = conn->context;
1980         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1981
1982         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1983         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1984                                   &isert_cmd->tx_desc.iscsi_header);
1985         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1986         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1987
1988         isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1989
1990         return isert_post_response(isert_conn, isert_cmd);
1991 }
1992
1993 static int
1994 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1995 {
1996         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1997         struct isert_conn *isert_conn = conn->context;
1998         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1999         struct isert_device *device = isert_conn->device;
2000         struct ib_device *ib_dev = device->ib_device;
2001         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2002         struct iscsi_reject *hdr =
2003                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2004
2005         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2006         iscsit_build_reject(cmd, conn, hdr);
2007         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2008
2009         hton24(hdr->dlength, ISCSI_HDR_LEN);
2010         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2011                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2012                         DMA_TO_DEVICE);
2013         if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
2014                 return -ENOMEM;
2015         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2016         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2017         tx_dsg->length  = ISCSI_HDR_LEN;
2018         tx_dsg->lkey    = device->pd->local_dma_lkey;
2019         isert_cmd->tx_desc.num_sge = 2;
2020
2021         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2022
2023         isert_dbg("conn %p Posting Reject\n", isert_conn);
2024
2025         return isert_post_response(isert_conn, isert_cmd);
2026 }
2027
2028 static int
2029 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2030 {
2031         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2032         struct isert_conn *isert_conn = conn->context;
2033         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2034         struct iscsi_text_rsp *hdr =
2035                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2036         u32 txt_rsp_len;
2037         int rc;
2038
2039         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2040         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2041         if (rc < 0)
2042                 return rc;
2043
2044         txt_rsp_len = rc;
2045         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2046
2047         if (txt_rsp_len) {
2048                 struct isert_device *device = isert_conn->device;
2049                 struct ib_device *ib_dev = device->ib_device;
2050                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2051                 void *txt_rsp_buf = cmd->buf_ptr;
2052
2053                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2054                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2055                 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
2056                         return -ENOMEM;
2057
2058                 isert_cmd->pdu_buf_len = txt_rsp_len;
2059                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2060                 tx_dsg->length  = txt_rsp_len;
2061                 tx_dsg->lkey    = device->pd->local_dma_lkey;
2062                 isert_cmd->tx_desc.num_sge = 2;
2063         }
2064         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2065
2066         isert_dbg("conn %p Text Response\n", isert_conn);
2067
2068         return isert_post_response(isert_conn, isert_cmd);
2069 }
2070
2071 static inline void
2072 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2073                      struct ib_sig_domain *domain)
2074 {
2075         domain->sig_type = IB_SIG_TYPE_T10_DIF;
2076         domain->sig.dif.bg_type = IB_T10DIF_CRC;
2077         domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2078         domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2079         /*
2080          * At the moment we hard code those, but if in the future
2081          * the target core would like to use it, we will take it
2082          * from se_cmd.
2083          */
2084         domain->sig.dif.apptag_check_mask = 0xffff;
2085         domain->sig.dif.app_escape = true;
2086         domain->sig.dif.ref_escape = true;
2087         if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2088             se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2089                 domain->sig.dif.ref_remap = true;
2090 };
2091
2092 static int
2093 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2094 {
2095         memset(sig_attrs, 0, sizeof(*sig_attrs));
2096
2097         switch (se_cmd->prot_op) {
2098         case TARGET_PROT_DIN_INSERT:
2099         case TARGET_PROT_DOUT_STRIP:
2100                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2101                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2102                 break;
2103         case TARGET_PROT_DOUT_INSERT:
2104         case TARGET_PROT_DIN_STRIP:
2105                 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2106                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2107                 break;
2108         case TARGET_PROT_DIN_PASS:
2109         case TARGET_PROT_DOUT_PASS:
2110                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2111                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2112                 break;
2113         default:
2114                 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2115                 return -EINVAL;
2116         }
2117
2118         if (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD)
2119                 sig_attrs->check_mask |= IB_SIG_CHECK_GUARD;
2120         if (se_cmd->prot_checks & TARGET_DIF_CHECK_APPTAG)
2121                 sig_attrs->check_mask |= IB_SIG_CHECK_APPTAG;
2122         if (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)
2123                 sig_attrs->check_mask |= IB_SIG_CHECK_REFTAG;
2124
2125         return 0;
2126 }
2127
2128 static int
2129 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2130                 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2131 {
2132         struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
2133         enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2134         u8 port_num = conn->cm_id->port_num;
2135         u64 addr;
2136         u32 rkey, offset;
2137         int ret;
2138
2139         if (cmd->ctx_init_done)
2140                 goto rdma_ctx_post;
2141
2142         if (dir == DMA_FROM_DEVICE) {
2143                 addr = cmd->write_va;
2144                 rkey = cmd->write_stag;
2145                 offset = cmd->iscsi_cmd->write_data_done;
2146         } else {
2147                 addr = cmd->read_va;
2148                 rkey = cmd->read_stag;
2149                 offset = 0;
2150         }
2151
2152         if (isert_prot_cmd(conn, se_cmd)) {
2153                 struct ib_sig_attrs sig_attrs;
2154
2155                 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2156                 if (ret)
2157                         return ret;
2158
2159                 WARN_ON_ONCE(offset);
2160                 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2161                                 se_cmd->t_data_sg, se_cmd->t_data_nents,
2162                                 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2163                                 &sig_attrs, addr, rkey, dir);
2164         } else {
2165                 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2166                                 se_cmd->t_data_sg, se_cmd->t_data_nents,
2167                                 offset, addr, rkey, dir);
2168         }
2169
2170         if (ret < 0) {
2171                 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2172                 return ret;
2173         }
2174
2175         cmd->ctx_init_done = true;
2176
2177 rdma_ctx_post:
2178         ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2179         if (ret < 0)
2180                 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2181         return ret;
2182 }
2183
2184 static int
2185 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2186 {
2187         struct se_cmd *se_cmd = &cmd->se_cmd;
2188         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2189         struct isert_conn *isert_conn = conn->context;
2190         struct ib_cqe *cqe = NULL;
2191         struct ib_send_wr *chain_wr = NULL;
2192         int rc;
2193
2194         isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2195                  isert_cmd, se_cmd->data_length);
2196
2197         if (isert_prot_cmd(isert_conn, se_cmd)) {
2198                 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2199                 cqe = &isert_cmd->tx_desc.tx_cqe;
2200         } else {
2201                 /*
2202                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2203                  */
2204                 isert_create_send_desc(isert_conn, isert_cmd,
2205                                        &isert_cmd->tx_desc);
2206                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2207                                      &isert_cmd->tx_desc.iscsi_header);
2208                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2209                 isert_init_send_wr(isert_conn, isert_cmd,
2210                                    &isert_cmd->tx_desc.send_wr);
2211
2212                 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2213                 if (rc) {
2214                         isert_err("ib_post_recv failed with %d\n", rc);
2215                         return rc;
2216                 }
2217
2218                 chain_wr = &isert_cmd->tx_desc.send_wr;
2219         }
2220
2221         rc = isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2222         isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ rc: %d\n",
2223                   isert_cmd, rc);
2224         return rc;
2225 }
2226
2227 static int
2228 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2229 {
2230         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2231         int ret;
2232
2233         isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2234                  isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2235
2236         isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2237         ret = isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2238                                      &isert_cmd->tx_desc.tx_cqe, NULL);
2239
2240         isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE rc: %d\n",
2241                  isert_cmd, ret);
2242         return ret;
2243 }
2244
2245 static int
2246 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2247 {
2248         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2249         int ret = 0;
2250
2251         switch (state) {
2252         case ISTATE_REMOVE:
2253                 spin_lock_bh(&conn->cmd_lock);
2254                 list_del_init(&cmd->i_conn_node);
2255                 spin_unlock_bh(&conn->cmd_lock);
2256                 isert_put_cmd(isert_cmd, true);
2257                 break;
2258         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2259                 ret = isert_put_nopin(cmd, conn, false);
2260                 break;
2261         default:
2262                 isert_err("Unknown immediate state: 0x%02x\n", state);
2263                 ret = -EINVAL;
2264                 break;
2265         }
2266
2267         return ret;
2268 }
2269
2270 static int
2271 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2272 {
2273         struct isert_conn *isert_conn = conn->context;
2274         int ret;
2275
2276         switch (state) {
2277         case ISTATE_SEND_LOGOUTRSP:
2278                 ret = isert_put_logout_rsp(cmd, conn);
2279                 if (!ret)
2280                         isert_conn->logout_posted = true;
2281                 break;
2282         case ISTATE_SEND_NOPIN:
2283                 ret = isert_put_nopin(cmd, conn, true);
2284                 break;
2285         case ISTATE_SEND_TASKMGTRSP:
2286                 ret = isert_put_tm_rsp(cmd, conn);
2287                 break;
2288         case ISTATE_SEND_REJECT:
2289                 ret = isert_put_reject(cmd, conn);
2290                 break;
2291         case ISTATE_SEND_TEXTRSP:
2292                 ret = isert_put_text_rsp(cmd, conn);
2293                 break;
2294         case ISTATE_SEND_STATUS:
2295                 /*
2296                  * Special case for sending non GOOD SCSI status from TX thread
2297                  * context during pre se_cmd excecution failure.
2298                  */
2299                 ret = isert_put_response(conn, cmd);
2300                 break;
2301         default:
2302                 isert_err("Unknown response state: 0x%02x\n", state);
2303                 ret = -EINVAL;
2304                 break;
2305         }
2306
2307         return ret;
2308 }
2309
2310 struct rdma_cm_id *
2311 isert_setup_id(struct isert_np *isert_np)
2312 {
2313         struct iscsi_np *np = isert_np->np;
2314         struct rdma_cm_id *id;
2315         struct sockaddr *sa;
2316         int ret;
2317
2318         sa = (struct sockaddr *)&np->np_sockaddr;
2319         isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2320
2321         id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2322                             RDMA_PS_TCP, IB_QPT_RC);
2323         if (IS_ERR(id)) {
2324                 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2325                 ret = PTR_ERR(id);
2326                 goto out;
2327         }
2328         isert_dbg("id %p context %p\n", id, id->context);
2329
2330         ret = rdma_bind_addr(id, sa);
2331         if (ret) {
2332                 isert_err("rdma_bind_addr() failed: %d\n", ret);
2333                 goto out_id;
2334         }
2335
2336         ret = rdma_listen(id, 0);
2337         if (ret) {
2338                 isert_err("rdma_listen() failed: %d\n", ret);
2339                 goto out_id;
2340         }
2341
2342         return id;
2343 out_id:
2344         rdma_destroy_id(id);
2345 out:
2346         return ERR_PTR(ret);
2347 }
2348
2349 static int
2350 isert_setup_np(struct iscsi_np *np,
2351                struct sockaddr_storage *ksockaddr)
2352 {
2353         struct isert_np *isert_np;
2354         struct rdma_cm_id *isert_lid;
2355         int ret;
2356
2357         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2358         if (!isert_np)
2359                 return -ENOMEM;
2360
2361         sema_init(&isert_np->sem, 0);
2362         mutex_init(&isert_np->mutex);
2363         INIT_LIST_HEAD(&isert_np->accepted);
2364         INIT_LIST_HEAD(&isert_np->pending);
2365         isert_np->np = np;
2366
2367         /*
2368          * Setup the np->np_sockaddr from the passed sockaddr setup
2369          * in iscsi_target_configfs.c code..
2370          */
2371         memcpy(&np->np_sockaddr, ksockaddr,
2372                sizeof(struct sockaddr_storage));
2373
2374         isert_lid = isert_setup_id(isert_np);
2375         if (IS_ERR(isert_lid)) {
2376                 ret = PTR_ERR(isert_lid);
2377                 goto out;
2378         }
2379
2380         isert_np->cm_id = isert_lid;
2381         np->np_context = isert_np;
2382
2383         return 0;
2384
2385 out:
2386         kfree(isert_np);
2387
2388         return ret;
2389 }
2390
2391 static int
2392 isert_rdma_accept(struct isert_conn *isert_conn)
2393 {
2394         struct rdma_cm_id *cm_id = isert_conn->cm_id;
2395         struct rdma_conn_param cp;
2396         int ret;
2397         struct iser_cm_hdr rsp_hdr;
2398
2399         memset(&cp, 0, sizeof(struct rdma_conn_param));
2400         cp.initiator_depth = isert_conn->initiator_depth;
2401         cp.retry_count = 7;
2402         cp.rnr_retry_count = 7;
2403
2404         memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2405         rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2406         if (!isert_conn->snd_w_inv)
2407                 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2408         cp.private_data = (void *)&rsp_hdr;
2409         cp.private_data_len = sizeof(rsp_hdr);
2410
2411         ret = rdma_accept(cm_id, &cp);
2412         if (ret) {
2413                 isert_err("rdma_accept() failed with: %d\n", ret);
2414                 return ret;
2415         }
2416
2417         return 0;
2418 }
2419
2420 static int
2421 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2422 {
2423         struct isert_conn *isert_conn = conn->context;
2424         int ret;
2425
2426         isert_info("before login_req comp conn: %p\n", isert_conn);
2427         ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2428         if (ret) {
2429                 isert_err("isert_conn %p interrupted before got login req\n",
2430                           isert_conn);
2431                 return ret;
2432         }
2433         reinit_completion(&isert_conn->login_req_comp);
2434
2435         /*
2436          * For login requests after the first PDU, isert_rx_login_req() will
2437          * kick schedule_delayed_work(&conn->login_work) as the packet is
2438          * received, which turns this callback from iscsi_target_do_login_rx()
2439          * into a NOP.
2440          */
2441         if (!login->first_request)
2442                 return 0;
2443
2444         isert_rx_login_req(isert_conn);
2445
2446         isert_info("before login_comp conn: %p\n", conn);
2447         ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2448         if (ret)
2449                 return ret;
2450
2451         isert_info("processing login->req: %p\n", login->req);
2452
2453         return 0;
2454 }
2455
2456 static void
2457 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2458                     struct isert_conn *isert_conn)
2459 {
2460         struct rdma_cm_id *cm_id = isert_conn->cm_id;
2461         struct rdma_route *cm_route = &cm_id->route;
2462
2463         conn->login_family = np->np_sockaddr.ss_family;
2464
2465         conn->login_sockaddr = cm_route->addr.dst_addr;
2466         conn->local_sockaddr = cm_route->addr.src_addr;
2467 }
2468
2469 static int
2470 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2471 {
2472         struct isert_np *isert_np = np->np_context;
2473         struct isert_conn *isert_conn;
2474         int ret;
2475
2476 accept_wait:
2477         ret = down_interruptible(&isert_np->sem);
2478         if (ret)
2479                 return -ENODEV;
2480
2481         spin_lock_bh(&np->np_thread_lock);
2482         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2483                 spin_unlock_bh(&np->np_thread_lock);
2484                 isert_dbg("np_thread_state %d\n",
2485                          np->np_thread_state);
2486                 /**
2487                  * No point in stalling here when np_thread
2488                  * is in state RESET/SHUTDOWN/EXIT - bail
2489                  **/
2490                 return -ENODEV;
2491         }
2492         spin_unlock_bh(&np->np_thread_lock);
2493
2494         mutex_lock(&isert_np->mutex);
2495         if (list_empty(&isert_np->pending)) {
2496                 mutex_unlock(&isert_np->mutex);
2497                 goto accept_wait;
2498         }
2499         isert_conn = list_first_entry(&isert_np->pending,
2500                         struct isert_conn, node);
2501         list_del_init(&isert_conn->node);
2502         mutex_unlock(&isert_np->mutex);
2503
2504         conn->context = isert_conn;
2505         isert_conn->conn = conn;
2506         isert_conn->state = ISER_CONN_BOUND;
2507
2508         isert_set_conn_info(np, conn, isert_conn);
2509
2510         isert_dbg("Processing isert_conn: %p\n", isert_conn);
2511
2512         return 0;
2513 }
2514
2515 static void
2516 isert_free_np(struct iscsi_np *np)
2517 {
2518         struct isert_np *isert_np = np->np_context;
2519         struct isert_conn *isert_conn, *n;
2520
2521         if (isert_np->cm_id)
2522                 rdma_destroy_id(isert_np->cm_id);
2523
2524         /*
2525          * FIXME: At this point we don't have a good way to insure
2526          * that at this point we don't have hanging connections that
2527          * completed RDMA establishment but didn't start iscsi login
2528          * process. So work-around this by cleaning up what ever piled
2529          * up in accepted and pending lists.
2530          */
2531         mutex_lock(&isert_np->mutex);
2532         if (!list_empty(&isert_np->pending)) {
2533                 isert_info("Still have isert pending connections\n");
2534                 list_for_each_entry_safe(isert_conn, n,
2535                                          &isert_np->pending,
2536                                          node) {
2537                         isert_info("cleaning isert_conn %p state (%d)\n",
2538                                    isert_conn, isert_conn->state);
2539                         isert_connect_release(isert_conn);
2540                 }
2541         }
2542
2543         if (!list_empty(&isert_np->accepted)) {
2544                 isert_info("Still have isert accepted connections\n");
2545                 list_for_each_entry_safe(isert_conn, n,
2546                                          &isert_np->accepted,
2547                                          node) {
2548                         isert_info("cleaning isert_conn %p state (%d)\n",
2549                                    isert_conn, isert_conn->state);
2550                         isert_connect_release(isert_conn);
2551                 }
2552         }
2553         mutex_unlock(&isert_np->mutex);
2554
2555         np->np_context = NULL;
2556         kfree(isert_np);
2557 }
2558
2559 static void isert_release_work(struct work_struct *work)
2560 {
2561         struct isert_conn *isert_conn = container_of(work,
2562                                                      struct isert_conn,
2563                                                      release_work);
2564
2565         isert_info("Starting release conn %p\n", isert_conn);
2566
2567         mutex_lock(&isert_conn->mutex);
2568         isert_conn->state = ISER_CONN_DOWN;
2569         mutex_unlock(&isert_conn->mutex);
2570
2571         isert_info("Destroying conn %p\n", isert_conn);
2572         isert_put_conn(isert_conn);
2573 }
2574
2575 static void
2576 isert_wait4logout(struct isert_conn *isert_conn)
2577 {
2578         struct iscsi_conn *conn = isert_conn->conn;
2579
2580         isert_info("conn %p\n", isert_conn);
2581
2582         if (isert_conn->logout_posted) {
2583                 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2584                 wait_for_completion_timeout(&conn->conn_logout_comp,
2585                                             SECONDS_FOR_LOGOUT_COMP * HZ);
2586         }
2587 }
2588
2589 static void
2590 isert_wait4cmds(struct iscsi_conn *conn)
2591 {
2592         isert_info("iscsi_conn %p\n", conn);
2593
2594         if (conn->sess) {
2595                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2596                 target_wait_for_sess_cmds(conn->sess->se_sess);
2597         }
2598 }
2599
2600 /**
2601  * isert_put_unsol_pending_cmds() - Drop commands waiting for
2602  *     unsolicitate dataout
2603  * @conn:    iscsi connection
2604  *
2605  * We might still have commands that are waiting for unsolicited
2606  * dataouts messages. We must put the extra reference on those
2607  * before blocking on the target_wait_for_session_cmds
2608  */
2609 static void
2610 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
2611 {
2612         struct iscsi_cmd *cmd, *tmp;
2613         static LIST_HEAD(drop_cmd_list);
2614
2615         spin_lock_bh(&conn->cmd_lock);
2616         list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2617                 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2618                     (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2619                     (cmd->write_data_done < cmd->se_cmd.data_length))
2620                         list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2621         }
2622         spin_unlock_bh(&conn->cmd_lock);
2623
2624         list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2625                 list_del_init(&cmd->i_conn_node);
2626                 if (cmd->i_state != ISTATE_REMOVE) {
2627                         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2628
2629                         isert_info("conn %p dropping cmd %p\n", conn, cmd);
2630                         isert_put_cmd(isert_cmd, true);
2631                 }
2632         }
2633 }
2634
2635 static void isert_wait_conn(struct iscsi_conn *conn)
2636 {
2637         struct isert_conn *isert_conn = conn->context;
2638
2639         isert_info("Starting conn %p\n", isert_conn);
2640
2641         mutex_lock(&isert_conn->mutex);
2642         isert_conn_terminate(isert_conn);
2643         mutex_unlock(&isert_conn->mutex);
2644
2645         ib_drain_qp(isert_conn->qp);
2646         isert_put_unsol_pending_cmds(conn);
2647         isert_wait4cmds(conn);
2648         isert_wait4logout(isert_conn);
2649
2650         queue_work(isert_release_wq, &isert_conn->release_work);
2651 }
2652
2653 static void isert_free_conn(struct iscsi_conn *conn)
2654 {
2655         struct isert_conn *isert_conn = conn->context;
2656
2657         ib_drain_qp(isert_conn->qp);
2658         isert_put_conn(isert_conn);
2659 }
2660
2661 static void isert_get_rx_pdu(struct iscsi_conn *conn)
2662 {
2663         struct completion comp;
2664
2665         init_completion(&comp);
2666
2667         wait_for_completion_interruptible(&comp);
2668 }
2669
2670 static struct iscsit_transport iser_target_transport = {
2671         .name                   = "IB/iSER",
2672         .transport_type         = ISCSI_INFINIBAND,
2673         .rdma_shutdown          = true,
2674         .priv_size              = sizeof(struct isert_cmd),
2675         .owner                  = THIS_MODULE,
2676         .iscsit_setup_np        = isert_setup_np,
2677         .iscsit_accept_np       = isert_accept_np,
2678         .iscsit_free_np         = isert_free_np,
2679         .iscsit_wait_conn       = isert_wait_conn,
2680         .iscsit_free_conn       = isert_free_conn,
2681         .iscsit_get_login_rx    = isert_get_login_rx,
2682         .iscsit_put_login_tx    = isert_put_login_tx,
2683         .iscsit_immediate_queue = isert_immediate_queue,
2684         .iscsit_response_queue  = isert_response_queue,
2685         .iscsit_get_dataout     = isert_get_dataout,
2686         .iscsit_queue_data_in   = isert_put_datain,
2687         .iscsit_queue_status    = isert_put_response,
2688         .iscsit_aborted_task    = isert_aborted_task,
2689         .iscsit_get_rx_pdu      = isert_get_rx_pdu,
2690         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2691 };
2692
2693 static int __init isert_init(void)
2694 {
2695         int ret;
2696
2697         isert_comp_wq = alloc_workqueue("isert_comp_wq",
2698                                         WQ_UNBOUND | WQ_HIGHPRI, 0);
2699         if (!isert_comp_wq) {
2700                 isert_err("Unable to allocate isert_comp_wq\n");
2701                 return -ENOMEM;
2702         }
2703
2704         isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2705                                         WQ_UNBOUND_MAX_ACTIVE);
2706         if (!isert_release_wq) {
2707                 isert_err("Unable to allocate isert_release_wq\n");
2708                 ret = -ENOMEM;
2709                 goto destroy_comp_wq;
2710         }
2711
2712         iscsit_register_transport(&iser_target_transport);
2713         isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2714
2715         return 0;
2716
2717 destroy_comp_wq:
2718         destroy_workqueue(isert_comp_wq);
2719
2720         return ret;
2721 }
2722
2723 static void __exit isert_exit(void)
2724 {
2725         flush_scheduled_work();
2726         destroy_workqueue(isert_release_wq);
2727         destroy_workqueue(isert_comp_wq);
2728         iscsit_unregister_transport(&iser_target_transport);
2729         isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2730 }
2731
2732 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2733 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2734 MODULE_LICENSE("GPL");
2735
2736 module_init(isert_init);
2737 module_exit(isert_exit);