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         isert_conn->max_sge = min(device->ib_device->attrs.max_sge,
 141                                   device->ib_device->attrs.max_sge_rd);
 142         attr.cap.max_recv_sge = 1;
 143         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 144         attr.qp_type = IB_QPT_RC;
 145         if (device->pi_capable)
 146                 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
 147
 148         ret = rdma_create_qp(cma_id, device->pd, &attr);
 149         if (ret) {
 150                 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
 151                 return ERR_PTR(ret);
 152         }
 153
 154         return cma_id->qp;
 155 }
 156
 157 static int
 158 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
 159 {
 160         struct isert_comp *comp;
 161         int ret;
 162
 163         comp = isert_comp_get(isert_conn);
 164         isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
 165         if (IS_ERR(isert_conn->qp)) {
 166                 ret = PTR_ERR(isert_conn->qp);
 167                 goto err;
 168         }
 169
 170         return 0;
 171 err:
 172         isert_comp_put(comp);
 173         return ret;
 174 }
 175
 176 static int
 177 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 178 {
 179         struct isert_device *device = isert_conn->device;
 180         struct ib_device *ib_dev = device->ib_device;
 181         struct iser_rx_desc *rx_desc;
 182         struct ib_sge *rx_sg;
 183         u64 dma_addr;
 184         int i, j;
 185
 186         isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 187                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 188         if (!isert_conn->rx_descs)
 189                 goto fail;
 190
 191         rx_desc = isert_conn->rx_descs;
 192
 193         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 194                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 195                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 196                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 197                         goto dma_map_fail;
 198
 199                 rx_desc->dma_addr = dma_addr;
 200
 201                 rx_sg = &rx_desc->rx_sg;
 202                 rx_sg->addr = rx_desc->dma_addr;
 203                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 204                 rx_sg->lkey = device->pd->local_dma_lkey;
 205                 rx_desc->rx_cqe.done = isert_recv_done;
 206         }
 207
 208         return 0;
 209
 210 dma_map_fail:
 211         rx_desc = isert_conn->rx_descs;
 212         for (j = 0; j < i; j++, rx_desc++) {
 213                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 214                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 215         }
 216         kfree(isert_conn->rx_descs);
 217         isert_conn->rx_descs = NULL;
 218 fail:
 219         isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
 220
 221         return -ENOMEM;
 222 }
 223
 224 static void
 225 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 226 {
 227         struct ib_device *ib_dev = isert_conn->device->ib_device;
 228         struct iser_rx_desc *rx_desc;
 229         int i;
 230
 231         if (!isert_conn->rx_descs)
 232                 return;
 233
 234         rx_desc = isert_conn->rx_descs;
 235         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 236                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 237                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 238         }
 239
 240         kfree(isert_conn->rx_descs);
 241         isert_conn->rx_descs = NULL;
 242 }
 243
 244 static void
 245 isert_free_comps(struct isert_device *device)
 246 {
 247         int i;
 248
 249         for (i = 0; i < device->comps_used; i++) {
 250                 struct isert_comp *comp = &device->comps[i];
 251
 252                 if (comp->cq)
 253                         ib_free_cq(comp->cq);
 254         }
 255         kfree(device->comps);
 256 }
 257
 258 static int
 259 isert_alloc_comps(struct isert_device *device)
 260 {
 261         int i, max_cqe, ret = 0;
 262
 263         device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
 264                                  device->ib_device->num_comp_vectors));
 265
 266         isert_info("Using %d CQs, %s supports %d vectors support "
 267                    "pi_capable %d\n",
 268                    device->comps_used, device->ib_device->name,
 269                    device->ib_device->num_comp_vectors,
 270                    device->pi_capable);
 271
 272         device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
 273                                 GFP_KERNEL);
 274         if (!device->comps) {
 275                 isert_err("Unable to allocate completion contexts\n");
 276                 return -ENOMEM;
 277         }
 278
 279         max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
 280
 281         for (i = 0; i < device->comps_used; i++) {
 282                 struct isert_comp *comp = &device->comps[i];
 283
 284                 comp->device = device;
 285                 comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i,
 286                                 IB_POLL_WORKQUEUE);
 287                 if (IS_ERR(comp->cq)) {
 288                         isert_err("Unable to allocate cq\n");
 289                         ret = PTR_ERR(comp->cq);
 290                         comp->cq = NULL;
 291                         goto out_cq;
 292                 }
 293         }
 294
 295         return 0;
 296 out_cq:
 297         isert_free_comps(device);
 298         return ret;
 299 }
 300
 301 static int
 302 isert_create_device_ib_res(struct isert_device *device)
 303 {
 304         struct ib_device *ib_dev = device->ib_device;
 305         int ret;
 306
 307         isert_dbg("devattr->max_sge: %d\n", ib_dev->attrs.max_sge);
 308         isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
 309
 310         ret = isert_alloc_comps(device);
 311         if (ret)
 312                 goto out;
 313
 314         device->pd = ib_alloc_pd(ib_dev);
 315         if (IS_ERR(device->pd)) {
 316                 ret = PTR_ERR(device->pd);
 317                 isert_err("failed to allocate pd, device %p, ret=%d\n",
 318                           device, ret);
 319                 goto out_cq;
 320         }
 321
 322         /* Check signature cap */
 323         device->pi_capable = ib_dev->attrs.device_cap_flags &
 324                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 325
 326         return 0;
 327
 328 out_cq:
 329         isert_free_comps(device);
 330 out:
 331         if (ret > 0)
 332                 ret = -EINVAL;
 333         return ret;
 334 }
 335
 336 static void
 337 isert_free_device_ib_res(struct isert_device *device)
 338 {
 339         isert_info("device %p\n", device);
 340
 341         ib_dealloc_pd(device->pd);
 342         isert_free_comps(device);
 343 }
 344
 345 static void
 346 isert_device_put(struct isert_device *device)
 347 {
 348         mutex_lock(&device_list_mutex);
 349         device->refcount--;
 350         isert_info("device %p refcount %d\n", device, device->refcount);
 351         if (!device->refcount) {
 352                 isert_free_device_ib_res(device);
 353                 list_del(&device->dev_node);
 354                 kfree(device);
 355         }
 356         mutex_unlock(&device_list_mutex);
 357 }
 358
 359 static struct isert_device *
 360 isert_device_get(struct rdma_cm_id *cma_id)
 361 {
 362         struct isert_device *device;
 363         int ret;
 364
 365         mutex_lock(&device_list_mutex);
 366         list_for_each_entry(device, &device_list, dev_node) {
 367                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 368                         device->refcount++;
 369                         isert_info("Found iser device %p refcount %d\n",
 370                                    device, device->refcount);
 371                         mutex_unlock(&device_list_mutex);
 372                         return device;
 373                 }
 374         }
 375
 376         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 377         if (!device) {
 378                 mutex_unlock(&device_list_mutex);
 379                 return ERR_PTR(-ENOMEM);
 380         }
 381
 382         INIT_LIST_HEAD(&device->dev_node);
 383
 384         device->ib_device = cma_id->device;
 385         ret = isert_create_device_ib_res(device);
 386         if (ret) {
 387                 kfree(device);
 388                 mutex_unlock(&device_list_mutex);
 389                 return ERR_PTR(ret);
 390         }
 391
 392         device->refcount++;
 393         list_add_tail(&device->dev_node, &device_list);
 394         isert_info("Created a new iser device %p refcount %d\n",
 395                    device, device->refcount);
 396         mutex_unlock(&device_list_mutex);
 397
 398         return device;
 399 }
 400
 401 static void
 402 isert_init_conn(struct isert_conn *isert_conn)
 403 {
 404         isert_conn->state = ISER_CONN_INIT;
 405         INIT_LIST_HEAD(&isert_conn->node);
 406         init_completion(&isert_conn->login_comp);
 407         init_completion(&isert_conn->login_req_comp);
 408         kref_init(&isert_conn->kref);
 409         mutex_init(&isert_conn->mutex);
 410         INIT_WORK(&isert_conn->release_work, isert_release_work);
 411 }
 412
 413 static void
 414 isert_free_login_buf(struct isert_conn *isert_conn)
 415 {
 416         struct ib_device *ib_dev = isert_conn->device->ib_device;
 417
 418         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 419                             ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
 420         kfree(isert_conn->login_rsp_buf);
 421
 422         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 423                             ISER_RX_PAYLOAD_SIZE,
 424                             DMA_FROM_DEVICE);
 425         kfree(isert_conn->login_req_buf);
 426 }
 427
 428 static int
 429 isert_alloc_login_buf(struct isert_conn *isert_conn,
 430                       struct ib_device *ib_dev)
 431 {
 432         int ret;
 433
 434         isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
 435                         GFP_KERNEL);
 436         if (!isert_conn->login_req_buf) {
 437                 isert_err("Unable to allocate isert_conn->login_buf\n");
 438                 return -ENOMEM;
 439         }
 440
 441         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 442                                 isert_conn->login_req_buf,
 443                                 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 444         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 445         if (ret) {
 446                 isert_err("login_req_dma mapping error: %d\n", ret);
 447                 isert_conn->login_req_dma = 0;
 448                 goto out_free_login_req_buf;
 449         }
 450
 451         isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
 452         if (!isert_conn->login_rsp_buf) {
 453                 isert_err("Unable to allocate isert_conn->login_rspbuf\n");
 454                 goto out_unmap_login_req_buf;
 455         }
 456
 457         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 458                                         isert_conn->login_rsp_buf,
 459                                         ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
 460         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 461         if (ret) {
 462                 isert_err("login_rsp_dma mapping error: %d\n", ret);
 463                 isert_conn->login_rsp_dma = 0;
 464                 goto out_free_login_rsp_buf;
 465         }
 466
 467         return 0;
 468
 469 out_free_login_rsp_buf:
 470         kfree(isert_conn->login_rsp_buf);
 471 out_unmap_login_req_buf:
 472         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 473                             ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 474 out_free_login_req_buf:
 475         kfree(isert_conn->login_req_buf);
 476         return ret;
 477 }
 478
 479 static void
 480 isert_set_nego_params(struct isert_conn *isert_conn,
 481                       struct rdma_conn_param *param)
 482 {
 483         struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
 484
 485         /* Set max inflight RDMA READ requests */
 486         isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
 487                                 attr->max_qp_init_rd_atom);
 488         isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
 489
 490         if (param->private_data) {
 491                 u8 flags = *(u8 *)param->private_data;
 492
 493                 /*
 494                  * use remote invalidation if the both initiator
 495                  * and the HCA support it
 496                  */
 497                 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
 498                                           (attr->device_cap_flags &
 499                                            IB_DEVICE_MEM_MGT_EXTENSIONS);
 500                 if (isert_conn->snd_w_inv)
 501                         isert_info("Using remote invalidation\n");
 502         }
 503 }
 504
 505 static int
 506 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 507 {
 508         struct isert_np *isert_np = cma_id->context;
 509         struct iscsi_np *np = isert_np->np;
 510         struct isert_conn *isert_conn;
 511         struct isert_device *device;
 512         int ret = 0;
 513
 514         spin_lock_bh(&np->np_thread_lock);
 515         if (!np->enabled) {
 516                 spin_unlock_bh(&np->np_thread_lock);
 517                 isert_dbg("iscsi_np is not enabled, reject connect request\n");
 518                 return rdma_reject(cma_id, NULL, 0);
 519         }
 520         spin_unlock_bh(&np->np_thread_lock);
 521
 522         isert_dbg("cma_id: %p, portal: %p\n",
 523                  cma_id, cma_id->context);
 524
 525         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 526         if (!isert_conn)
 527                 return -ENOMEM;
 528
 529         isert_init_conn(isert_conn);
 530         isert_conn->cm_id = cma_id;
 531
 532         ret = isert_alloc_login_buf(isert_conn, cma_id->device);
 533         if (ret)
 534                 goto out;
 535
 536         device = isert_device_get(cma_id);
 537         if (IS_ERR(device)) {
 538                 ret = PTR_ERR(device);
 539                 goto out_rsp_dma_map;
 540         }
 541         isert_conn->device = device;
 542
 543         isert_set_nego_params(isert_conn, &event->param.conn);
 544
 545         ret = isert_conn_setup_qp(isert_conn, cma_id);
 546         if (ret)
 547                 goto out_conn_dev;
 548
 549         ret = isert_login_post_recv(isert_conn);
 550         if (ret)
 551                 goto out_conn_dev;
 552
 553         ret = isert_rdma_accept(isert_conn);
 554         if (ret)
 555                 goto out_conn_dev;
 556
 557         mutex_lock(&isert_np->mutex);
 558         list_add_tail(&isert_conn->node, &isert_np->accepted);
 559         mutex_unlock(&isert_np->mutex);
 560
 561         return 0;
 562
 563 out_conn_dev:
 564         isert_device_put(device);
 565 out_rsp_dma_map:
 566         isert_free_login_buf(isert_conn);
 567 out:
 568         kfree(isert_conn);
 569         rdma_reject(cma_id, NULL, 0);
 570         return ret;
 571 }
 572
 573 static void
 574 isert_connect_release(struct isert_conn *isert_conn)
 575 {
 576         struct isert_device *device = isert_conn->device;
 577
 578         isert_dbg("conn %p\n", isert_conn);
 579
 580         BUG_ON(!device);
 581
 582         isert_free_rx_descriptors(isert_conn);
 583         if (isert_conn->cm_id)
 584                 rdma_destroy_id(isert_conn->cm_id);
 585
 586         if (isert_conn->qp) {
 587                 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
 588
 589                 isert_comp_put(comp);
 590                 ib_destroy_qp(isert_conn->qp);
 591         }
 592
 593         if (isert_conn->login_req_buf)
 594                 isert_free_login_buf(isert_conn);
 595
 596         isert_device_put(device);
 597
 598         kfree(isert_conn);
 599 }
 600
 601 static void
 602 isert_connected_handler(struct rdma_cm_id *cma_id)
 603 {
 604         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 605         struct isert_np *isert_np = cma_id->context;
 606
 607         isert_info("conn %p\n", isert_conn);
 608
 609         mutex_lock(&isert_conn->mutex);
 610         isert_conn->state = ISER_CONN_UP;
 611         kref_get(&isert_conn->kref);
 612         mutex_unlock(&isert_conn->mutex);
 613
 614         mutex_lock(&isert_np->mutex);
 615         list_move_tail(&isert_conn->node, &isert_np->pending);
 616         mutex_unlock(&isert_np->mutex);
 617
 618         isert_info("np %p: Allow accept_np to continue\n", isert_np);
 619         up(&isert_np->sem);
 620 }
 621
 622 static void
 623 isert_release_kref(struct kref *kref)
 624 {
 625         struct isert_conn *isert_conn = container_of(kref,
 626                                 struct isert_conn, kref);
 627
 628         isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
 629                    current->pid);
 630
 631         isert_connect_release(isert_conn);
 632 }
 633
 634 static void
 635 isert_put_conn(struct isert_conn *isert_conn)
 636 {
 637         kref_put(&isert_conn->kref, isert_release_kref);
 638 }
 639
 640 static void
 641 isert_handle_unbound_conn(struct isert_conn *isert_conn)
 642 {
 643         struct isert_np *isert_np = isert_conn->cm_id->context;
 644
 645         mutex_lock(&isert_np->mutex);
 646         if (!list_empty(&isert_conn->node)) {
 647                 /*
 648                  * This means iscsi doesn't know this connection
 649                  * so schedule a cleanup ourselves
 650                  */
 651                 list_del_init(&isert_conn->node);
 652                 isert_put_conn(isert_conn);
 653                 queue_work(isert_release_wq, &isert_conn->release_work);
 654         }
 655         mutex_unlock(&isert_np->mutex);
 656 }
 657
 658 /**
 659  * isert_conn_terminate() - Initiate connection termination
 660  * @isert_conn: isert connection struct
 661  *
 662  * Notes:
 663  * In case the connection state is BOUND, move state
 664  * to TEMINATING and start teardown sequence (rdma_disconnect).
 665  * In case the connection state is UP, complete flush as well.
 666  *
 667  * This routine must be called with mutex held. Thus it is
 668  * safe to call multiple times.
 669  */
 670 static void
 671 isert_conn_terminate(struct isert_conn *isert_conn)
 672 {
 673         int err;
 674
 675         if (isert_conn->state >= ISER_CONN_TERMINATING)
 676                 return;
 677
 678         isert_info("Terminating conn %p state %d\n",
 679                    isert_conn, isert_conn->state);
 680         isert_conn->state = ISER_CONN_TERMINATING;
 681         err = rdma_disconnect(isert_conn->cm_id);
 682         if (err)
 683                 isert_warn("Failed rdma_disconnect isert_conn %p\n",
 684                            isert_conn);
 685 }
 686
 687 static int
 688 isert_np_cma_handler(struct isert_np *isert_np,
 689                      enum rdma_cm_event_type event)
 690 {
 691         isert_dbg("%s (%d): isert np %p\n",
 692                   rdma_event_msg(event), event, isert_np);
 693
 694         switch (event) {
 695         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 696                 isert_np->cm_id = NULL;
 697                 break;
 698         case RDMA_CM_EVENT_ADDR_CHANGE:
 699                 isert_np->cm_id = isert_setup_id(isert_np);
 700                 if (IS_ERR(isert_np->cm_id)) {
 701                         isert_err("isert np %p setup id failed: %ld\n",
 702                                   isert_np, PTR_ERR(isert_np->cm_id));
 703                         isert_np->cm_id = NULL;
 704                 }
 705                 break;
 706         default:
 707                 isert_err("isert np %p Unexpected event %d\n",
 708                           isert_np, event);
 709         }
 710
 711         return -1;
 712 }
 713
 714 static int
 715 isert_disconnected_handler(struct rdma_cm_id *cma_id,
 716                            enum rdma_cm_event_type event)
 717 {
 718         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 719
 720         mutex_lock(&isert_conn->mutex);
 721         switch (isert_conn->state) {
 722         case ISER_CONN_TERMINATING:
 723                 break;
 724         case ISER_CONN_UP:
 725                 isert_conn_terminate(isert_conn);
 726                 ib_drain_qp(isert_conn->qp);
 727                 isert_handle_unbound_conn(isert_conn);
 728                 break;
 729         case ISER_CONN_BOUND:
 730         case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
 731                 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
 732                 break;
 733         default:
 734                 isert_warn("conn %p teminating in state %d\n",
 735                            isert_conn, isert_conn->state);
 736         }
 737         mutex_unlock(&isert_conn->mutex);
 738
 739         return 0;
 740 }
 741
 742 static int
 743 isert_connect_error(struct rdma_cm_id *cma_id)
 744 {
 745         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 746
 747         list_del_init(&isert_conn->node);
 748         isert_conn->cm_id = NULL;
 749         isert_put_conn(isert_conn);
 750
 751         return -1;
 752 }
 753
 754 static int
 755 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 756 {
 757         struct isert_np *isert_np = cma_id->context;
 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_DEVICE_REMOVAL: /* FALLTHRU */
 779         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
 780                 ret = isert_disconnected_handler(cma_id, event->event);
 781                 break;
 782         case RDMA_CM_EVENT_REJECTED:       /* FALLTHRU */
 783         case RDMA_CM_EVENT_UNREACHABLE:    /* FALLTHRU */
 784         case RDMA_CM_EVENT_CONNECT_ERROR:
 785                 ret = isert_connect_error(cma_id);
 786                 break;
 787         default:
 788                 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
 789                 break;
 790         }
 791
 792         return ret;
 793 }
 794
 795 static int
 796 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
 797 {
 798         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 799         int i, ret;
 800         struct iser_rx_desc *rx_desc;
 801
 802         for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
 803                 rx_desc = &isert_conn->rx_descs[i];
 804
 805                 rx_wr->wr_cqe = &rx_desc->rx_cqe;
 806                 rx_wr->sg_list = &rx_desc->rx_sg;
 807                 rx_wr->num_sge = 1;
 808                 rx_wr->next = rx_wr + 1;
 809         }
 810         rx_wr--;
 811         rx_wr->next = NULL; /* mark end of work requests list */
 812
 813         ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
 814                            &rx_wr_failed);
 815         if (ret)
 816                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 817
 818         return ret;
 819 }
 820
 821 static int
 822 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
 823 {
 824         struct ib_recv_wr *rx_wr_failed, rx_wr;
 825         int ret;
 826
 827         rx_wr.wr_cqe = &rx_desc->rx_cqe;
 828         rx_wr.sg_list = &rx_desc->rx_sg;
 829         rx_wr.num_sge = 1;
 830         rx_wr.next = NULL;
 831
 832         ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
 833         if (ret)
 834                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 835
 836         return ret;
 837 }
 838
 839 static int
 840 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 841 {
 842         struct ib_device *ib_dev = isert_conn->cm_id->device;
 843         struct ib_send_wr send_wr, *send_wr_failed;
 844         int ret;
 845
 846         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 847                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 848
 849         tx_desc->tx_cqe.done = isert_login_send_done;
 850
 851         send_wr.next    = NULL;
 852         send_wr.wr_cqe  = &tx_desc->tx_cqe;
 853         send_wr.sg_list = tx_desc->tx_sg;
 854         send_wr.num_sge = tx_desc->num_sge;
 855         send_wr.opcode  = IB_WR_SEND;
 856         send_wr.send_flags = IB_SEND_SIGNALED;
 857
 858         ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
 859         if (ret)
 860                 isert_err("ib_post_send() failed, ret: %d\n", ret);
 861
 862         return ret;
 863 }
 864
 865 static void
 866 isert_create_send_desc(struct isert_conn *isert_conn,
 867                        struct isert_cmd *isert_cmd,
 868                        struct iser_tx_desc *tx_desc)
 869 {
 870         struct isert_device *device = isert_conn->device;
 871         struct ib_device *ib_dev = device->ib_device;
 872
 873         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 874                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 875
 876         memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
 877         tx_desc->iser_header.flags = ISCSI_CTRL;
 878
 879         tx_desc->num_sge = 1;
 880
 881         if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
 882                 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
 883                 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 884         }
 885 }
 886
 887 static int
 888 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 889                    struct iser_tx_desc *tx_desc)
 890 {
 891         struct isert_device *device = isert_conn->device;
 892         struct ib_device *ib_dev = device->ib_device;
 893         u64 dma_addr;
 894
 895         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 896                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 897         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 898                 isert_err("ib_dma_mapping_error() failed\n");
 899                 return -ENOMEM;
 900         }
 901
 902         tx_desc->dma_addr = dma_addr;
 903         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 904         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 905         tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
 906
 907         isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
 908                   tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
 909                   tx_desc->tx_sg[0].lkey);
 910
 911         return 0;
 912 }
 913
 914 static void
 915 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 916                    struct ib_send_wr *send_wr)
 917 {
 918         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 919
 920         tx_desc->tx_cqe.done = isert_send_done;
 921         send_wr->wr_cqe = &tx_desc->tx_cqe;
 922
 923         if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
 924                 send_wr->opcode  = IB_WR_SEND_WITH_INV;
 925                 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
 926         } else {
 927                 send_wr->opcode = IB_WR_SEND;
 928         }
 929
 930         send_wr->sg_list = &tx_desc->tx_sg[0];
 931         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 932         send_wr->send_flags = IB_SEND_SIGNALED;
 933 }
 934
 935 static int
 936 isert_login_post_recv(struct isert_conn *isert_conn)
 937 {
 938         struct ib_recv_wr rx_wr, *rx_wr_fail;
 939         struct ib_sge sge;
 940         int ret;
 941
 942         memset(&sge, 0, sizeof(struct ib_sge));
 943         sge.addr = isert_conn->login_req_dma;
 944         sge.length = ISER_RX_PAYLOAD_SIZE;
 945         sge.lkey = isert_conn->device->pd->local_dma_lkey;
 946
 947         isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
 948                 sge.addr, sge.length, sge.lkey);
 949
 950         isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
 951
 952         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
 953         rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
 954         rx_wr.sg_list = &sge;
 955         rx_wr.num_sge = 1;
 956
 957         ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
 958         if (ret)
 959                 isert_err("ib_post_recv() failed: %d\n", ret);
 960
 961         return ret;
 962 }
 963
 964 static int
 965 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
 966                    u32 length)
 967 {
 968         struct isert_conn *isert_conn = conn->context;
 969         struct isert_device *device = isert_conn->device;
 970         struct ib_device *ib_dev = device->ib_device;
 971         struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
 972         int ret;
 973
 974         isert_create_send_desc(isert_conn, NULL, tx_desc);
 975
 976         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
 977                sizeof(struct iscsi_hdr));
 978
 979         isert_init_tx_hdrs(isert_conn, tx_desc);
 980
 981         if (length > 0) {
 982                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
 983
 984                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
 985                                            length, DMA_TO_DEVICE);
 986
 987                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
 988
 989                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
 990                                               length, DMA_TO_DEVICE);
 991
 992                 tx_dsg->addr    = isert_conn->login_rsp_dma;
 993                 tx_dsg->length  = length;
 994                 tx_dsg->lkey    = isert_conn->device->pd->local_dma_lkey;
 995                 tx_desc->num_sge = 2;
 996         }
 997         if (!login->login_failed) {
 998                 if (login->login_complete) {
 999                         ret = isert_alloc_rx_descriptors(isert_conn);
1000                         if (ret)
1001                                 return ret;
1002
1003                         ret = isert_post_recvm(isert_conn,
1004                                                ISERT_QP_MAX_RECV_DTOS);
1005                         if (ret)
1006                                 return ret;
1007
1008                         /* Now we are in FULL_FEATURE phase */
1009                         mutex_lock(&isert_conn->mutex);
1010                         isert_conn->state = ISER_CONN_FULL_FEATURE;
1011                         mutex_unlock(&isert_conn->mutex);
1012                         goto post_send;
1013                 }
1014
1015                 ret = isert_login_post_recv(isert_conn);
1016                 if (ret)
1017                         return ret;
1018         }
1019 post_send:
1020         ret = isert_login_post_send(isert_conn, tx_desc);
1021         if (ret)
1022                 return ret;
1023
1024         return 0;
1025 }
1026
1027 static void
1028 isert_rx_login_req(struct isert_conn *isert_conn)
1029 {
1030         struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1031         int rx_buflen = isert_conn->login_req_len;
1032         struct iscsi_conn *conn = isert_conn->conn;
1033         struct iscsi_login *login = conn->conn_login;
1034         int size;
1035
1036         isert_info("conn %p\n", isert_conn);
1037
1038         WARN_ON_ONCE(!login);
1039
1040         if (login->first_request) {
1041                 struct iscsi_login_req *login_req =
1042                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1043                 /*
1044                  * Setup the initial iscsi_login values from the leading
1045                  * login request PDU.
1046                  */
1047                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1048                 login->current_stage =
1049                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1050                          >> 2;
1051                 login->version_min      = login_req->min_version;
1052                 login->version_max      = login_req->max_version;
1053                 memcpy(login->isid, login_req->isid, 6);
1054                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1055                 login->init_task_tag    = login_req->itt;
1056                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1057                 login->cid              = be16_to_cpu(login_req->cid);
1058                 login->tsih             = be16_to_cpu(login_req->tsih);
1059         }
1060
1061         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1062
1063         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1064         isert_dbg("Using login payload size: %d, rx_buflen: %d "
1065                   "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1066                   MAX_KEY_VALUE_PAIRS);
1067         memcpy(login->req_buf, &rx_desc->data[0], size);
1068
1069         if (login->first_request) {
1070                 complete(&isert_conn->login_comp);
1071                 return;
1072         }
1073         schedule_delayed_work(&conn->login_work, 0);
1074 }
1075
1076 static struct iscsi_cmd
1077 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1078 {
1079         struct isert_conn *isert_conn = conn->context;
1080         struct isert_cmd *isert_cmd;
1081         struct iscsi_cmd *cmd;
1082
1083         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1084         if (!cmd) {
1085                 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1086                 return NULL;
1087         }
1088         isert_cmd = iscsit_priv_cmd(cmd);
1089         isert_cmd->conn = isert_conn;
1090         isert_cmd->iscsi_cmd = cmd;
1091         isert_cmd->rx_desc = rx_desc;
1092
1093         return cmd;
1094 }
1095
1096 static int
1097 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1098                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1099                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1100 {
1101         struct iscsi_conn *conn = isert_conn->conn;
1102         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1103         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1104         bool dump_payload = false;
1105         unsigned int data_len;
1106
1107         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1108         if (rc < 0)
1109                 return rc;
1110
1111         imm_data = cmd->immediate_data;
1112         imm_data_len = cmd->first_burst_len;
1113         unsol_data = cmd->unsolicited_data;
1114         data_len = cmd->se_cmd.data_length;
1115
1116         if (imm_data && imm_data_len == data_len)
1117                 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1118         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1119         if (rc < 0) {
1120                 return 0;
1121         } else if (rc > 0) {
1122                 dump_payload = true;
1123                 goto sequence_cmd;
1124         }
1125
1126         if (!imm_data)
1127                 return 0;
1128
1129         if (imm_data_len != data_len) {
1130                 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1131                 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1132                                     &rx_desc->data[0], imm_data_len);
1133                 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1134                           sg_nents, imm_data_len);
1135         } else {
1136                 sg_init_table(&isert_cmd->sg, 1);
1137                 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1138                 cmd->se_cmd.t_data_nents = 1;
1139                 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1140                 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1141                           imm_data_len);
1142         }
1143
1144         cmd->write_data_done += imm_data_len;
1145
1146         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1147                 spin_lock_bh(&cmd->istate_lock);
1148                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1149                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1150                 spin_unlock_bh(&cmd->istate_lock);
1151         }
1152
1153 sequence_cmd:
1154         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1155
1156         if (!rc && dump_payload == false && unsol_data)
1157                 iscsit_set_unsoliticed_dataout(cmd);
1158         else if (dump_payload && imm_data)
1159                 target_put_sess_cmd(&cmd->se_cmd);
1160
1161         return 0;
1162 }
1163
1164 static int
1165 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1166                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1167 {
1168         struct scatterlist *sg_start;
1169         struct iscsi_conn *conn = isert_conn->conn;
1170         struct iscsi_cmd *cmd = NULL;
1171         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1172         u32 unsol_data_len = ntoh24(hdr->dlength);
1173         int rc, sg_nents, sg_off, page_off;
1174
1175         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1176         if (rc < 0)
1177                 return rc;
1178         else if (!cmd)
1179                 return 0;
1180         /*
1181          * FIXME: Unexpected unsolicited_data out
1182          */
1183         if (!cmd->unsolicited_data) {
1184                 isert_err("Received unexpected solicited data payload\n");
1185                 dump_stack();
1186                 return -1;
1187         }
1188
1189         isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1190                   "write_data_done: %u, data_length: %u\n",
1191                   unsol_data_len,  cmd->write_data_done,
1192                   cmd->se_cmd.data_length);
1193
1194         sg_off = cmd->write_data_done / PAGE_SIZE;
1195         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1196         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1197         page_off = cmd->write_data_done % PAGE_SIZE;
1198         /*
1199          * FIXME: Non page-aligned unsolicited_data out
1200          */
1201         if (page_off) {
1202                 isert_err("unexpected non-page aligned data payload\n");
1203                 dump_stack();
1204                 return -1;
1205         }
1206         isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1207                   "sg_nents: %u from %p %u\n", sg_start, sg_off,
1208                   sg_nents, &rx_desc->data[0], unsol_data_len);
1209
1210         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1211                             unsol_data_len);
1212
1213         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1214         if (rc < 0)
1215                 return rc;
1216
1217         /*
1218          * multiple data-outs on the same command can arrive -
1219          * so post the buffer before hand
1220          */
1221         rc = isert_post_recv(isert_conn, rx_desc);
1222         if (rc) {
1223                 isert_err("ib_post_recv failed with %d\n", rc);
1224                 return rc;
1225         }
1226         return 0;
1227 }
1228
1229 static int
1230 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1231                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1232                      unsigned char *buf)
1233 {
1234         struct iscsi_conn *conn = isert_conn->conn;
1235         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1236         int rc;
1237
1238         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1239         if (rc < 0)
1240                 return rc;
1241         /*
1242          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1243          */
1244
1245         return iscsit_process_nop_out(conn, cmd, hdr);
1246 }
1247
1248 static int
1249 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1250                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1251                       struct iscsi_text *hdr)
1252 {
1253         struct iscsi_conn *conn = isert_conn->conn;
1254         u32 payload_length = ntoh24(hdr->dlength);
1255         int rc;
1256         unsigned char *text_in = NULL;
1257
1258         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1259         if (rc < 0)
1260                 return rc;
1261
1262         if (payload_length) {
1263                 text_in = kzalloc(payload_length, GFP_KERNEL);
1264                 if (!text_in) {
1265                         isert_err("Unable to allocate text_in of payload_length: %u\n",
1266                                   payload_length);
1267                         return -ENOMEM;
1268                 }
1269         }
1270         cmd->text_in_ptr = text_in;
1271
1272         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1273
1274         return iscsit_process_text_cmd(conn, cmd, hdr);
1275 }
1276
1277 static int
1278 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1279                 uint32_t read_stag, uint64_t read_va,
1280                 uint32_t write_stag, uint64_t write_va)
1281 {
1282         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1283         struct iscsi_conn *conn = isert_conn->conn;
1284         struct iscsi_cmd *cmd;
1285         struct isert_cmd *isert_cmd;
1286         int ret = -EINVAL;
1287         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1288
1289         if (conn->sess->sess_ops->SessionType &&
1290            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1291                 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1292                           " ignoring\n", opcode);
1293                 return 0;
1294         }
1295
1296         switch (opcode) {
1297         case ISCSI_OP_SCSI_CMD:
1298                 cmd = isert_allocate_cmd(conn, rx_desc);
1299                 if (!cmd)
1300                         break;
1301
1302                 isert_cmd = iscsit_priv_cmd(cmd);
1303                 isert_cmd->read_stag = read_stag;
1304                 isert_cmd->read_va = read_va;
1305                 isert_cmd->write_stag = write_stag;
1306                 isert_cmd->write_va = write_va;
1307                 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1308
1309                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1310                                         rx_desc, (unsigned char *)hdr);
1311                 break;
1312         case ISCSI_OP_NOOP_OUT:
1313                 cmd = isert_allocate_cmd(conn, rx_desc);
1314                 if (!cmd)
1315                         break;
1316
1317                 isert_cmd = iscsit_priv_cmd(cmd);
1318                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1319                                            rx_desc, (unsigned char *)hdr);
1320                 break;
1321         case ISCSI_OP_SCSI_DATA_OUT:
1322                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1323                                                 (unsigned char *)hdr);
1324                 break;
1325         case ISCSI_OP_SCSI_TMFUNC:
1326                 cmd = isert_allocate_cmd(conn, rx_desc);
1327                 if (!cmd)
1328                         break;
1329
1330                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1331                                                 (unsigned char *)hdr);
1332                 break;
1333         case ISCSI_OP_LOGOUT:
1334                 cmd = isert_allocate_cmd(conn, rx_desc);
1335                 if (!cmd)
1336                         break;
1337
1338                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1339                 break;
1340         case ISCSI_OP_TEXT:
1341                 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1342                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1343                 else
1344                         cmd = isert_allocate_cmd(conn, rx_desc);
1345
1346                 if (!cmd)
1347                         break;
1348
1349                 isert_cmd = iscsit_priv_cmd(cmd);
1350                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1351                                             rx_desc, (struct iscsi_text *)hdr);
1352                 break;
1353         default:
1354                 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1355                 dump_stack();
1356                 break;
1357         }
1358
1359         return ret;
1360 }
1361
1362 static void
1363 isert_print_wc(struct ib_wc *wc, const char *type)
1364 {
1365         if (wc->status != IB_WC_WR_FLUSH_ERR)
1366                 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1367                           ib_wc_status_msg(wc->status), wc->status,
1368                           wc->vendor_err);
1369         else
1370                 isert_dbg("%s failure: %s (%d)\n", type,
1371                           ib_wc_status_msg(wc->status), wc->status);
1372 }
1373
1374 static void
1375 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1376 {
1377         struct isert_conn *isert_conn = wc->qp->qp_context;
1378         struct ib_device *ib_dev = isert_conn->cm_id->device;
1379         struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1380         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1381         struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1382         uint64_t read_va = 0, write_va = 0;
1383         uint32_t read_stag = 0, write_stag = 0;
1384
1385         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1386                 isert_print_wc(wc, "recv");
1387                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1388                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1389                 return;
1390         }
1391
1392         ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1393                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1394
1395         isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1396                  rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1397                  (int)(wc->byte_len - ISER_HEADERS_LEN));
1398
1399         switch (iser_ctrl->flags & 0xF0) {
1400         case ISCSI_CTRL:
1401                 if (iser_ctrl->flags & ISER_RSV) {
1402                         read_stag = be32_to_cpu(iser_ctrl->read_stag);
1403                         read_va = be64_to_cpu(iser_ctrl->read_va);
1404                         isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1405                                   read_stag, (unsigned long long)read_va);
1406                 }
1407                 if (iser_ctrl->flags & ISER_WSV) {
1408                         write_stag = be32_to_cpu(iser_ctrl->write_stag);
1409                         write_va = be64_to_cpu(iser_ctrl->write_va);
1410                         isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1411                                   write_stag, (unsigned long long)write_va);
1412                 }
1413
1414                 isert_dbg("ISER ISCSI_CTRL PDU\n");
1415                 break;
1416         case ISER_HELLO:
1417                 isert_err("iSER Hello message\n");
1418                 break;
1419         default:
1420                 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1421                 break;
1422         }
1423
1424         isert_rx_opcode(isert_conn, rx_desc,
1425                         read_stag, read_va, write_stag, write_va);
1426
1427         ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1428                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1429 }
1430
1431 static void
1432 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1433 {
1434         struct isert_conn *isert_conn = wc->qp->qp_context;
1435         struct ib_device *ib_dev = isert_conn->cm_id->device;
1436
1437         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1438                 isert_print_wc(wc, "login recv");
1439                 return;
1440         }
1441
1442         ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1443                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1444
1445         isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1446
1447         if (isert_conn->conn) {
1448                 struct iscsi_login *login = isert_conn->conn->conn_login;
1449
1450                 if (login && !login->first_request)
1451                         isert_rx_login_req(isert_conn);
1452         }
1453
1454         mutex_lock(&isert_conn->mutex);
1455         complete(&isert_conn->login_req_comp);
1456         mutex_unlock(&isert_conn->mutex);
1457
1458         ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1459                                 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1460 }
1461
1462 static void
1463 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1464 {
1465         struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
1466         enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1467
1468         if (!cmd->rw.nr_ops)
1469                 return;
1470
1471         if (isert_prot_cmd(conn, se_cmd)) {
1472                 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1473                                 conn->cm_id->port_num, se_cmd->t_data_sg,
1474                                 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1475                                 se_cmd->t_prot_nents, dir);
1476         } else {
1477                 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1478                                 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1479         }
1480
1481         cmd->rw.nr_ops = 0;
1482 }
1483
1484 static void
1485 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1486 {
1487         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1488         struct isert_conn *isert_conn = isert_cmd->conn;
1489         struct iscsi_conn *conn = isert_conn->conn;
1490         struct iscsi_text_rsp *hdr;
1491
1492         isert_dbg("Cmd %p\n", isert_cmd);
1493
1494         switch (cmd->iscsi_opcode) {
1495         case ISCSI_OP_SCSI_CMD:
1496                 spin_lock_bh(&conn->cmd_lock);
1497                 if (!list_empty(&cmd->i_conn_node))
1498                         list_del_init(&cmd->i_conn_node);
1499                 spin_unlock_bh(&conn->cmd_lock);
1500
1501                 if (cmd->data_direction == DMA_TO_DEVICE) {
1502                         iscsit_stop_dataout_timer(cmd);
1503                         /*
1504                          * Check for special case during comp_err where
1505                          * WRITE_PENDING has been handed off from core,
1506                          * but requires an extra target_put_sess_cmd()
1507                          * before transport_generic_free_cmd() below.
1508                          */
1509                         if (comp_err &&
1510                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1511                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1512
1513                                 target_put_sess_cmd(se_cmd);
1514                         }
1515                 }
1516
1517                 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1518                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1519                 break;
1520         case ISCSI_OP_SCSI_TMFUNC:
1521                 spin_lock_bh(&conn->cmd_lock);
1522                 if (!list_empty(&cmd->i_conn_node))
1523                         list_del_init(&cmd->i_conn_node);
1524                 spin_unlock_bh(&conn->cmd_lock);
1525
1526                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1527                 break;
1528         case ISCSI_OP_REJECT:
1529         case ISCSI_OP_NOOP_OUT:
1530         case ISCSI_OP_TEXT:
1531                 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1532                 /* If the continue bit is on, keep the command alive */
1533                 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1534                         break;
1535
1536                 spin_lock_bh(&conn->cmd_lock);
1537                 if (!list_empty(&cmd->i_conn_node))
1538                         list_del_init(&cmd->i_conn_node);
1539                 spin_unlock_bh(&conn->cmd_lock);
1540
1541                 /*
1542                  * Handle special case for REJECT when iscsi_add_reject*() has
1543                  * overwritten the original iscsi_opcode assignment, and the
1544                  * associated cmd->se_cmd needs to be released.
1545                  */
1546                 if (cmd->se_cmd.se_tfo != NULL) {
1547                         isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1548                                  cmd->iscsi_opcode);
1549                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1550                         break;
1551                 }
1552                 /*
1553                  * Fall-through
1554                  */
1555         default:
1556                 iscsit_release_cmd(cmd);
1557                 break;
1558         }
1559 }
1560
1561 static void
1562 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1563 {
1564         if (tx_desc->dma_addr != 0) {
1565                 isert_dbg("unmap single for tx_desc->dma_addr\n");
1566                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1567                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1568                 tx_desc->dma_addr = 0;
1569         }
1570 }
1571
1572 static void
1573 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1574                      struct ib_device *ib_dev, bool comp_err)
1575 {
1576         if (isert_cmd->pdu_buf_dma != 0) {
1577                 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1578                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1579                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1580                 isert_cmd->pdu_buf_dma = 0;
1581         }
1582
1583         isert_unmap_tx_desc(tx_desc, ib_dev);
1584         isert_put_cmd(isert_cmd, comp_err);
1585 }
1586
1587 static int
1588 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1589 {
1590         struct ib_mr_status mr_status;
1591         int ret;
1592
1593         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1594         if (ret) {
1595                 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1596                 goto fail_mr_status;
1597         }
1598
1599         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1600                 u64 sec_offset_err;
1601                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1602
1603                 switch (mr_status.sig_err.err_type) {
1604                 case IB_SIG_BAD_GUARD:
1605                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1606                         break;
1607                 case IB_SIG_BAD_REFTAG:
1608                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1609                         break;
1610                 case IB_SIG_BAD_APPTAG:
1611                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1612                         break;
1613                 }
1614                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1615                 do_div(sec_offset_err, block_size);
1616                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1617
1618                 isert_err("PI error found type %d at sector 0x%llx "
1619                           "expected 0x%x vs actual 0x%x\n",
1620                           mr_status.sig_err.err_type,
1621                           (unsigned long long)se_cmd->bad_sector,
1622                           mr_status.sig_err.expected,
1623                           mr_status.sig_err.actual);
1624                 ret = 1;
1625         }
1626
1627 fail_mr_status:
1628         return ret;
1629 }
1630
1631 static void
1632 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1633 {
1634         struct isert_conn *isert_conn = wc->qp->qp_context;
1635         struct isert_device *device = isert_conn->device;
1636         struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1637         struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1638         struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1639         int ret = 0;
1640
1641         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1642                 isert_print_wc(wc, "rdma write");
1643                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1644                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1645                 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1646                 return;
1647         }
1648
1649         isert_dbg("Cmd %p\n", isert_cmd);
1650
1651         ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr);
1652         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1653
1654         if (ret)
1655                 transport_send_check_condition_and_sense(cmd, cmd->pi_err, 0);
1656         else
1657                 isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1658 }
1659
1660 static void
1661 isert_rdma_read_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 iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1668         struct se_cmd *se_cmd = &cmd->se_cmd;
1669         int ret = 0;
1670
1671         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1672                 isert_print_wc(wc, "rdma read");
1673                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1674                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1675                 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1676                 return;
1677         }
1678
1679         isert_dbg("Cmd %p\n", isert_cmd);
1680
1681         iscsit_stop_dataout_timer(cmd);
1682
1683         if (isert_prot_cmd(isert_conn, se_cmd))
1684                 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr);
1685         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1686         cmd->write_data_done = 0;
1687
1688         isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1689         spin_lock_bh(&cmd->istate_lock);
1690         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1691         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1692         spin_unlock_bh(&cmd->istate_lock);
1693
1694         if (ret) {
1695                 target_put_sess_cmd(se_cmd);
1696                 transport_send_check_condition_and_sense(se_cmd,
1697                                                          se_cmd->pi_err, 0);
1698         } else {
1699                 target_execute_cmd(se_cmd);
1700         }
1701 }
1702
1703 static void
1704 isert_do_control_comp(struct work_struct *work)
1705 {
1706         struct isert_cmd *isert_cmd = container_of(work,
1707                         struct isert_cmd, comp_work);
1708         struct isert_conn *isert_conn = isert_cmd->conn;
1709         struct ib_device *ib_dev = isert_conn->cm_id->device;
1710         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1711
1712         isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1713
1714         switch (cmd->i_state) {
1715         case ISTATE_SEND_TASKMGTRSP:
1716                 iscsit_tmr_post_handler(cmd, cmd->conn);
1717         case ISTATE_SEND_REJECT:   /* FALLTHRU */
1718         case ISTATE_SEND_TEXTRSP:  /* FALLTHRU */
1719                 cmd->i_state = ISTATE_SENT_STATUS;
1720                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1721                                      ib_dev, false);
1722                 break;
1723         case ISTATE_SEND_LOGOUTRSP:
1724                 iscsit_logout_post_handler(cmd, cmd->conn);
1725                 break;
1726         default:
1727                 isert_err("Unknown i_state %d\n", cmd->i_state);
1728                 dump_stack();
1729                 break;
1730         }
1731 }
1732
1733 static void
1734 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1735 {
1736         struct isert_conn *isert_conn = wc->qp->qp_context;
1737         struct ib_device *ib_dev = isert_conn->cm_id->device;
1738         struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1739
1740         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1741                 isert_print_wc(wc, "login send");
1742                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1743                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1744         }
1745
1746         isert_unmap_tx_desc(tx_desc, ib_dev);
1747 }
1748
1749 static void
1750 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1751 {
1752         struct isert_conn *isert_conn = wc->qp->qp_context;
1753         struct ib_device *ib_dev = isert_conn->cm_id->device;
1754         struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1755         struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1756
1757         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1758                 isert_print_wc(wc, "send");
1759                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1760                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1761                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1762                 return;
1763         }
1764
1765         isert_dbg("Cmd %p\n", isert_cmd);
1766
1767         switch (isert_cmd->iscsi_cmd->i_state) {
1768         case ISTATE_SEND_TASKMGTRSP:
1769         case ISTATE_SEND_LOGOUTRSP:
1770         case ISTATE_SEND_REJECT:
1771         case ISTATE_SEND_TEXTRSP:
1772                 isert_unmap_tx_desc(tx_desc, ib_dev);
1773
1774                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1775                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1776                 return;
1777         default:
1778                 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
1779                 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1780                 break;
1781         }
1782 }
1783
1784 static int
1785 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1786 {
1787         struct ib_send_wr *wr_failed;
1788         int ret;
1789
1790         ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1791         if (ret) {
1792                 isert_err("ib_post_recv failed with %d\n", ret);
1793                 return ret;
1794         }
1795
1796         ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
1797                            &wr_failed);
1798         if (ret) {
1799                 isert_err("ib_post_send failed with %d\n", ret);
1800                 return ret;
1801         }
1802         return ret;
1803 }
1804
1805 static int
1806 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1807 {
1808         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1809         struct isert_conn *isert_conn = conn->context;
1810         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1811         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1812                                 &isert_cmd->tx_desc.iscsi_header;
1813
1814         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1815         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1816         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1817         /*
1818          * Attach SENSE DATA payload to iSCSI Response PDU
1819          */
1820         if (cmd->se_cmd.sense_buffer &&
1821             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1822             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1823                 struct isert_device *device = isert_conn->device;
1824                 struct ib_device *ib_dev = device->ib_device;
1825                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1826                 u32 padding, pdu_len;
1827
1828                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1829                                    cmd->sense_buffer);
1830                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1831
1832                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1833                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1834                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1835
1836                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1837                                 (void *)cmd->sense_buffer, pdu_len,
1838                                 DMA_TO_DEVICE);
1839
1840                 isert_cmd->pdu_buf_len = pdu_len;
1841                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1842                 tx_dsg->length  = pdu_len;
1843                 tx_dsg->lkey    = device->pd->local_dma_lkey;
1844                 isert_cmd->tx_desc.num_sge = 2;
1845         }
1846
1847         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1848
1849         isert_dbg("Posting SCSI Response\n");
1850
1851         return isert_post_response(isert_conn, isert_cmd);
1852 }
1853
1854 static void
1855 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1856 {
1857         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1858         struct isert_conn *isert_conn = conn->context;
1859
1860         spin_lock_bh(&conn->cmd_lock);
1861         if (!list_empty(&cmd->i_conn_node))
1862                 list_del_init(&cmd->i_conn_node);
1863         spin_unlock_bh(&conn->cmd_lock);
1864
1865         if (cmd->data_direction == DMA_TO_DEVICE)
1866                 iscsit_stop_dataout_timer(cmd);
1867         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1868 }
1869
1870 static enum target_prot_op
1871 isert_get_sup_prot_ops(struct iscsi_conn *conn)
1872 {
1873         struct isert_conn *isert_conn = conn->context;
1874         struct isert_device *device = isert_conn->device;
1875
1876         if (conn->tpg->tpg_attrib.t10_pi) {
1877                 if (device->pi_capable) {
1878                         isert_info("conn %p PI offload enabled\n", isert_conn);
1879                         isert_conn->pi_support = true;
1880                         return TARGET_PROT_ALL;
1881                 }
1882         }
1883
1884         isert_info("conn %p PI offload disabled\n", isert_conn);
1885         isert_conn->pi_support = false;
1886
1887         return TARGET_PROT_NORMAL;
1888 }
1889
1890 static int
1891 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1892                 bool nopout_response)
1893 {
1894         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1895         struct isert_conn *isert_conn = conn->context;
1896         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1897
1898         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1899         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1900                                &isert_cmd->tx_desc.iscsi_header,
1901                                nopout_response);
1902         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1903         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1904
1905         isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1906
1907         return isert_post_response(isert_conn, isert_cmd);
1908 }
1909
1910 static int
1911 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1912 {
1913         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1914         struct isert_conn *isert_conn = conn->context;
1915         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1916
1917         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1918         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1919                                 &isert_cmd->tx_desc.iscsi_header);
1920         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1921         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1922
1923         isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1924
1925         return isert_post_response(isert_conn, isert_cmd);
1926 }
1927
1928 static int
1929 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1930 {
1931         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1932         struct isert_conn *isert_conn = conn->context;
1933         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1934
1935         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1936         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1937                                   &isert_cmd->tx_desc.iscsi_header);
1938         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1939         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1940
1941         isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1942
1943         return isert_post_response(isert_conn, isert_cmd);
1944 }
1945
1946 static int
1947 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1948 {
1949         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1950         struct isert_conn *isert_conn = conn->context;
1951         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1952         struct isert_device *device = isert_conn->device;
1953         struct ib_device *ib_dev = device->ib_device;
1954         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1955         struct iscsi_reject *hdr =
1956                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1957
1958         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1959         iscsit_build_reject(cmd, conn, hdr);
1960         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1961
1962         hton24(hdr->dlength, ISCSI_HDR_LEN);
1963         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1964                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1965                         DMA_TO_DEVICE);
1966         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1967         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1968         tx_dsg->length  = ISCSI_HDR_LEN;
1969         tx_dsg->lkey    = device->pd->local_dma_lkey;
1970         isert_cmd->tx_desc.num_sge = 2;
1971
1972         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1973
1974         isert_dbg("conn %p Posting Reject\n", isert_conn);
1975
1976         return isert_post_response(isert_conn, isert_cmd);
1977 }
1978
1979 static int
1980 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1981 {
1982         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1983         struct isert_conn *isert_conn = conn->context;
1984         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1985         struct iscsi_text_rsp *hdr =
1986                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1987         u32 txt_rsp_len;
1988         int rc;
1989
1990         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1991         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
1992         if (rc < 0)
1993                 return rc;
1994
1995         txt_rsp_len = rc;
1996         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1997
1998         if (txt_rsp_len) {
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                 void *txt_rsp_buf = cmd->buf_ptr;
2003
2004                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2005                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2006
2007                 isert_cmd->pdu_buf_len = txt_rsp_len;
2008                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2009                 tx_dsg->length  = txt_rsp_len;
2010                 tx_dsg->lkey    = device->pd->local_dma_lkey;
2011                 isert_cmd->tx_desc.num_sge = 2;
2012         }
2013         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2014
2015         isert_dbg("conn %p Text Response\n", isert_conn);
2016
2017         return isert_post_response(isert_conn, isert_cmd);
2018 }
2019
2020 static inline void
2021 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2022                      struct ib_sig_domain *domain)
2023 {
2024         domain->sig_type = IB_SIG_TYPE_T10_DIF;
2025         domain->sig.dif.bg_type = IB_T10DIF_CRC;
2026         domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2027         domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2028         /*
2029          * At the moment we hard code those, but if in the future
2030          * the target core would like to use it, we will take it
2031          * from se_cmd.
2032          */
2033         domain->sig.dif.apptag_check_mask = 0xffff;
2034         domain->sig.dif.app_escape = true;
2035         domain->sig.dif.ref_escape = true;
2036         if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2037             se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2038                 domain->sig.dif.ref_remap = true;
2039 };
2040
2041 static int
2042 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2043 {
2044         memset(sig_attrs, 0, sizeof(*sig_attrs));
2045
2046         switch (se_cmd->prot_op) {
2047         case TARGET_PROT_DIN_INSERT:
2048         case TARGET_PROT_DOUT_STRIP:
2049                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2050                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2051                 break;
2052         case TARGET_PROT_DOUT_INSERT:
2053         case TARGET_PROT_DIN_STRIP:
2054                 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2055                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2056                 break;
2057         case TARGET_PROT_DIN_PASS:
2058         case TARGET_PROT_DOUT_PASS:
2059                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2060                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2061                 break;
2062         default:
2063                 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2064                 return -EINVAL;
2065         }
2066
2067         sig_attrs->check_mask =
2068                (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2069                (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2070                (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2071         return 0;
2072 }
2073
2074 static int
2075 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2076                 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2077 {
2078         struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
2079         enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2080         u8 port_num = conn->cm_id->port_num;
2081         u64 addr;
2082         u32 rkey, offset;
2083         int ret;
2084
2085         if (dir == DMA_FROM_DEVICE) {
2086                 addr = cmd->write_va;
2087                 rkey = cmd->write_stag;
2088                 offset = cmd->iscsi_cmd->write_data_done;
2089         } else {
2090                 addr = cmd->read_va;
2091                 rkey = cmd->read_stag;
2092                 offset = 0;
2093         }
2094
2095         if (isert_prot_cmd(conn, se_cmd)) {
2096                 struct ib_sig_attrs sig_attrs;
2097
2098                 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2099                 if (ret)
2100                         return ret;
2101
2102                 WARN_ON_ONCE(offset);
2103                 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2104                                 se_cmd->t_data_sg, se_cmd->t_data_nents,
2105                                 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2106                                 &sig_attrs, addr, rkey, dir);
2107         } else {
2108                 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2109                                 se_cmd->t_data_sg, se_cmd->t_data_nents,
2110                                 offset, addr, rkey, dir);
2111         }
2112         if (ret < 0) {
2113                 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2114                 return ret;
2115         }
2116
2117         ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2118         if (ret < 0)
2119                 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2120         return ret;
2121 }
2122
2123 static int
2124 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2125 {
2126         struct se_cmd *se_cmd = &cmd->se_cmd;
2127         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2128         struct isert_conn *isert_conn = conn->context;
2129         struct ib_cqe *cqe = NULL;
2130         struct ib_send_wr *chain_wr = NULL;
2131         int rc;
2132
2133         isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2134                  isert_cmd, se_cmd->data_length);
2135
2136         if (isert_prot_cmd(isert_conn, se_cmd)) {
2137                 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2138                 cqe = &isert_cmd->tx_desc.tx_cqe;
2139         } else {
2140                 /*
2141                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2142                  */
2143                 isert_create_send_desc(isert_conn, isert_cmd,
2144                                        &isert_cmd->tx_desc);
2145                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2146                                      &isert_cmd->tx_desc.iscsi_header);
2147                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2148                 isert_init_send_wr(isert_conn, isert_cmd,
2149                                    &isert_cmd->tx_desc.send_wr);
2150
2151                 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2152                 if (rc) {
2153                         isert_err("ib_post_recv failed with %d\n", rc);
2154                         return rc;
2155                 }
2156
2157                 chain_wr = &isert_cmd->tx_desc.send_wr;
2158         }
2159
2160         isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2161         isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n", isert_cmd);
2162         return 1;
2163 }
2164
2165 static int
2166 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2167 {
2168         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2169
2170         isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2171                  isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2172
2173         isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2174         isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2175                         &isert_cmd->tx_desc.tx_cqe, NULL);
2176
2177         isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2178                  isert_cmd);
2179         return 0;
2180 }
2181
2182 static int
2183 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2184 {
2185         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2186         int ret = 0;
2187
2188         switch (state) {
2189         case ISTATE_REMOVE:
2190                 spin_lock_bh(&conn->cmd_lock);
2191                 list_del_init(&cmd->i_conn_node);
2192                 spin_unlock_bh(&conn->cmd_lock);
2193                 isert_put_cmd(isert_cmd, true);
2194                 break;
2195         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2196                 ret = isert_put_nopin(cmd, conn, false);
2197                 break;
2198         default:
2199                 isert_err("Unknown immediate state: 0x%02x\n", state);
2200                 ret = -EINVAL;
2201                 break;
2202         }
2203
2204         return ret;
2205 }
2206
2207 static int
2208 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2209 {
2210         struct isert_conn *isert_conn = conn->context;
2211         int ret;
2212
2213         switch (state) {
2214         case ISTATE_SEND_LOGOUTRSP:
2215                 ret = isert_put_logout_rsp(cmd, conn);
2216                 if (!ret)
2217                         isert_conn->logout_posted = true;
2218                 break;
2219         case ISTATE_SEND_NOPIN:
2220                 ret = isert_put_nopin(cmd, conn, true);
2221                 break;
2222         case ISTATE_SEND_TASKMGTRSP:
2223                 ret = isert_put_tm_rsp(cmd, conn);
2224                 break;
2225         case ISTATE_SEND_REJECT:
2226                 ret = isert_put_reject(cmd, conn);
2227                 break;
2228         case ISTATE_SEND_TEXTRSP:
2229                 ret = isert_put_text_rsp(cmd, conn);
2230                 break;
2231         case ISTATE_SEND_STATUS:
2232                 /*
2233                  * Special case for sending non GOOD SCSI status from TX thread
2234                  * context during pre se_cmd excecution failure.
2235                  */
2236                 ret = isert_put_response(conn, cmd);
2237                 break;
2238         default:
2239                 isert_err("Unknown response state: 0x%02x\n", state);
2240                 ret = -EINVAL;
2241                 break;
2242         }
2243
2244         return ret;
2245 }
2246
2247 struct rdma_cm_id *
2248 isert_setup_id(struct isert_np *isert_np)
2249 {
2250         struct iscsi_np *np = isert_np->np;
2251         struct rdma_cm_id *id;
2252         struct sockaddr *sa;
2253         int ret;
2254
2255         sa = (struct sockaddr *)&np->np_sockaddr;
2256         isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2257
2258         id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2259                             RDMA_PS_TCP, IB_QPT_RC);
2260         if (IS_ERR(id)) {
2261                 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2262                 ret = PTR_ERR(id);
2263                 goto out;
2264         }
2265         isert_dbg("id %p context %p\n", id, id->context);
2266
2267         ret = rdma_bind_addr(id, sa);
2268         if (ret) {
2269                 isert_err("rdma_bind_addr() failed: %d\n", ret);
2270                 goto out_id;
2271         }
2272
2273         ret = rdma_listen(id, 0);
2274         if (ret) {
2275                 isert_err("rdma_listen() failed: %d\n", ret);
2276                 goto out_id;
2277         }
2278
2279         return id;
2280 out_id:
2281         rdma_destroy_id(id);
2282 out:
2283         return ERR_PTR(ret);
2284 }
2285
2286 static int
2287 isert_setup_np(struct iscsi_np *np,
2288                struct sockaddr_storage *ksockaddr)
2289 {
2290         struct isert_np *isert_np;
2291         struct rdma_cm_id *isert_lid;
2292         int ret;
2293
2294         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2295         if (!isert_np) {
2296                 isert_err("Unable to allocate struct isert_np\n");
2297                 return -ENOMEM;
2298         }
2299         sema_init(&isert_np->sem, 0);
2300         mutex_init(&isert_np->mutex);
2301         INIT_LIST_HEAD(&isert_np->accepted);
2302         INIT_LIST_HEAD(&isert_np->pending);
2303         isert_np->np = np;
2304
2305         /*
2306          * Setup the np->np_sockaddr from the passed sockaddr setup
2307          * in iscsi_target_configfs.c code..
2308          */
2309         memcpy(&np->np_sockaddr, ksockaddr,
2310                sizeof(struct sockaddr_storage));
2311
2312         isert_lid = isert_setup_id(isert_np);
2313         if (IS_ERR(isert_lid)) {
2314                 ret = PTR_ERR(isert_lid);
2315                 goto out;
2316         }
2317
2318         isert_np->cm_id = isert_lid;
2319         np->np_context = isert_np;
2320
2321         return 0;
2322
2323 out:
2324         kfree(isert_np);
2325
2326         return ret;
2327 }
2328
2329 static int
2330 isert_rdma_accept(struct isert_conn *isert_conn)
2331 {
2332         struct rdma_cm_id *cm_id = isert_conn->cm_id;
2333         struct rdma_conn_param cp;
2334         int ret;
2335         struct iser_cm_hdr rsp_hdr;
2336
2337         memset(&cp, 0, sizeof(struct rdma_conn_param));
2338         cp.initiator_depth = isert_conn->initiator_depth;
2339         cp.retry_count = 7;
2340         cp.rnr_retry_count = 7;
2341
2342         memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2343         rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2344         if (!isert_conn->snd_w_inv)
2345                 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2346         cp.private_data = (void *)&rsp_hdr;
2347         cp.private_data_len = sizeof(rsp_hdr);
2348
2349         ret = rdma_accept(cm_id, &cp);
2350         if (ret) {
2351                 isert_err("rdma_accept() failed with: %d\n", ret);
2352                 return ret;
2353         }
2354
2355         return 0;
2356 }
2357
2358 static int
2359 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2360 {
2361         struct isert_conn *isert_conn = conn->context;
2362         int ret;
2363
2364         isert_info("before login_req comp conn: %p\n", isert_conn);
2365         ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2366         if (ret) {
2367                 isert_err("isert_conn %p interrupted before got login req\n",
2368                           isert_conn);
2369                 return ret;
2370         }
2371         reinit_completion(&isert_conn->login_req_comp);
2372
2373         /*
2374          * For login requests after the first PDU, isert_rx_login_req() will
2375          * kick schedule_delayed_work(&conn->login_work) as the packet is
2376          * received, which turns this callback from iscsi_target_do_login_rx()
2377          * into a NOP.
2378          */
2379         if (!login->first_request)
2380                 return 0;
2381
2382         isert_rx_login_req(isert_conn);
2383
2384         isert_info("before login_comp conn: %p\n", conn);
2385         ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2386         if (ret)
2387                 return ret;
2388
2389         isert_info("processing login->req: %p\n", login->req);
2390
2391         return 0;
2392 }
2393
2394 static void
2395 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2396                     struct isert_conn *isert_conn)
2397 {
2398         struct rdma_cm_id *cm_id = isert_conn->cm_id;
2399         struct rdma_route *cm_route = &cm_id->route;
2400
2401         conn->login_family = np->np_sockaddr.ss_family;
2402
2403         conn->login_sockaddr = cm_route->addr.dst_addr;
2404         conn->local_sockaddr = cm_route->addr.src_addr;
2405 }
2406
2407 static int
2408 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2409 {
2410         struct isert_np *isert_np = np->np_context;
2411         struct isert_conn *isert_conn;
2412         int ret;
2413
2414 accept_wait:
2415         ret = down_interruptible(&isert_np->sem);
2416         if (ret)
2417                 return -ENODEV;
2418
2419         spin_lock_bh(&np->np_thread_lock);
2420         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2421                 spin_unlock_bh(&np->np_thread_lock);
2422                 isert_dbg("np_thread_state %d\n",
2423                          np->np_thread_state);
2424                 /**
2425                  * No point in stalling here when np_thread
2426                  * is in state RESET/SHUTDOWN/EXIT - bail
2427                  **/
2428                 return -ENODEV;
2429         }
2430         spin_unlock_bh(&np->np_thread_lock);
2431
2432         mutex_lock(&isert_np->mutex);
2433         if (list_empty(&isert_np->pending)) {
2434                 mutex_unlock(&isert_np->mutex);
2435                 goto accept_wait;
2436         }
2437         isert_conn = list_first_entry(&isert_np->pending,
2438                         struct isert_conn, node);
2439         list_del_init(&isert_conn->node);
2440         mutex_unlock(&isert_np->mutex);
2441
2442         conn->context = isert_conn;
2443         isert_conn->conn = conn;
2444         isert_conn->state = ISER_CONN_BOUND;
2445
2446         isert_set_conn_info(np, conn, isert_conn);
2447
2448         isert_dbg("Processing isert_conn: %p\n", isert_conn);
2449
2450         return 0;
2451 }
2452
2453 static void
2454 isert_free_np(struct iscsi_np *np)
2455 {
2456         struct isert_np *isert_np = np->np_context;
2457         struct isert_conn *isert_conn, *n;
2458
2459         if (isert_np->cm_id)
2460                 rdma_destroy_id(isert_np->cm_id);
2461
2462         /*
2463          * FIXME: At this point we don't have a good way to insure
2464          * that at this point we don't have hanging connections that
2465          * completed RDMA establishment but didn't start iscsi login
2466          * process. So work-around this by cleaning up what ever piled
2467          * up in accepted and pending lists.
2468          */
2469         mutex_lock(&isert_np->mutex);
2470         if (!list_empty(&isert_np->pending)) {
2471                 isert_info("Still have isert pending connections\n");
2472                 list_for_each_entry_safe(isert_conn, n,
2473                                          &isert_np->pending,
2474                                          node) {
2475                         isert_info("cleaning isert_conn %p state (%d)\n",
2476                                    isert_conn, isert_conn->state);
2477                         isert_connect_release(isert_conn);
2478                 }
2479         }
2480
2481         if (!list_empty(&isert_np->accepted)) {
2482                 isert_info("Still have isert accepted connections\n");
2483                 list_for_each_entry_safe(isert_conn, n,
2484                                          &isert_np->accepted,
2485                                          node) {
2486                         isert_info("cleaning isert_conn %p state (%d)\n",
2487                                    isert_conn, isert_conn->state);
2488                         isert_connect_release(isert_conn);
2489                 }
2490         }
2491         mutex_unlock(&isert_np->mutex);
2492
2493         np->np_context = NULL;
2494         kfree(isert_np);
2495 }
2496
2497 static void isert_release_work(struct work_struct *work)
2498 {
2499         struct isert_conn *isert_conn = container_of(work,
2500                                                      struct isert_conn,
2501                                                      release_work);
2502
2503         isert_info("Starting release conn %p\n", isert_conn);
2504
2505         mutex_lock(&isert_conn->mutex);
2506         isert_conn->state = ISER_CONN_DOWN;
2507         mutex_unlock(&isert_conn->mutex);
2508
2509         isert_info("Destroying conn %p\n", isert_conn);
2510         isert_put_conn(isert_conn);
2511 }
2512
2513 static void
2514 isert_wait4logout(struct isert_conn *isert_conn)
2515 {
2516         struct iscsi_conn *conn = isert_conn->conn;
2517
2518         isert_info("conn %p\n", isert_conn);
2519
2520         if (isert_conn->logout_posted) {
2521                 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2522                 wait_for_completion_timeout(&conn->conn_logout_comp,
2523                                             SECONDS_FOR_LOGOUT_COMP * HZ);
2524         }
2525 }
2526
2527 static void
2528 isert_wait4cmds(struct iscsi_conn *conn)
2529 {
2530         isert_info("iscsi_conn %p\n", conn);
2531
2532         if (conn->sess) {
2533                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2534                 target_wait_for_sess_cmds(conn->sess->se_sess);
2535         }
2536 }
2537
2538 /**
2539  * isert_put_unsol_pending_cmds() - Drop commands waiting for
2540  *     unsolicitate dataout
2541  * @conn:    iscsi connection
2542  *
2543  * We might still have commands that are waiting for unsolicited
2544  * dataouts messages. We must put the extra reference on those
2545  * before blocking on the target_wait_for_session_cmds
2546  */
2547 static void
2548 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
2549 {
2550         struct iscsi_cmd *cmd, *tmp;
2551         static LIST_HEAD(drop_cmd_list);
2552
2553         spin_lock_bh(&conn->cmd_lock);
2554         list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2555                 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2556                     (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2557                     (cmd->write_data_done < cmd->se_cmd.data_length))
2558                         list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2559         }
2560         spin_unlock_bh(&conn->cmd_lock);
2561
2562         list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2563                 list_del_init(&cmd->i_conn_node);
2564                 if (cmd->i_state != ISTATE_REMOVE) {
2565                         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2566
2567                         isert_info("conn %p dropping cmd %p\n", conn, cmd);
2568                         isert_put_cmd(isert_cmd, true);
2569                 }
2570         }
2571 }
2572
2573 static void isert_wait_conn(struct iscsi_conn *conn)
2574 {
2575         struct isert_conn *isert_conn = conn->context;
2576
2577         isert_info("Starting conn %p\n", isert_conn);
2578
2579         mutex_lock(&isert_conn->mutex);
2580         isert_conn_terminate(isert_conn);
2581         mutex_unlock(&isert_conn->mutex);
2582
2583         ib_drain_qp(isert_conn->qp);
2584         isert_put_unsol_pending_cmds(conn);
2585         isert_wait4cmds(conn);
2586         isert_wait4logout(isert_conn);
2587
2588         queue_work(isert_release_wq, &isert_conn->release_work);
2589 }
2590
2591 static void isert_free_conn(struct iscsi_conn *conn)
2592 {
2593         struct isert_conn *isert_conn = conn->context;
2594
2595         ib_drain_qp(isert_conn->qp);
2596         isert_put_conn(isert_conn);
2597 }
2598
2599 static void isert_get_rx_pdu(struct iscsi_conn *conn)
2600 {
2601         struct completion comp;
2602
2603         init_completion(&comp);
2604
2605         wait_for_completion_interruptible(&comp);
2606 }
2607
2608 static struct iscsit_transport iser_target_transport = {
2609         .name                   = "IB/iSER",
2610         .transport_type         = ISCSI_INFINIBAND,
2611         .rdma_shutdown          = true,
2612         .priv_size              = sizeof(struct isert_cmd),
2613         .owner                  = THIS_MODULE,
2614         .iscsit_setup_np        = isert_setup_np,
2615         .iscsit_accept_np       = isert_accept_np,
2616         .iscsit_free_np         = isert_free_np,
2617         .iscsit_wait_conn       = isert_wait_conn,
2618         .iscsit_free_conn       = isert_free_conn,
2619         .iscsit_get_login_rx    = isert_get_login_rx,
2620         .iscsit_put_login_tx    = isert_put_login_tx,
2621         .iscsit_immediate_queue = isert_immediate_queue,
2622         .iscsit_response_queue  = isert_response_queue,
2623         .iscsit_get_dataout     = isert_get_dataout,
2624         .iscsit_queue_data_in   = isert_put_datain,
2625         .iscsit_queue_status    = isert_put_response,
2626         .iscsit_aborted_task    = isert_aborted_task,
2627         .iscsit_get_rx_pdu      = isert_get_rx_pdu,
2628         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2629 };
2630
2631 static int __init isert_init(void)
2632 {
2633         int ret;
2634
2635         isert_comp_wq = alloc_workqueue("isert_comp_wq",
2636                                         WQ_UNBOUND | WQ_HIGHPRI, 0);
2637         if (!isert_comp_wq) {
2638                 isert_err("Unable to allocate isert_comp_wq\n");
2639                 ret = -ENOMEM;
2640                 return -ENOMEM;
2641         }
2642
2643         isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2644                                         WQ_UNBOUND_MAX_ACTIVE);
2645         if (!isert_release_wq) {
2646                 isert_err("Unable to allocate isert_release_wq\n");
2647                 ret = -ENOMEM;
2648                 goto destroy_comp_wq;
2649         }
2650
2651         iscsit_register_transport(&iser_target_transport);
2652         isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2653
2654         return 0;
2655
2656 destroy_comp_wq:
2657         destroy_workqueue(isert_comp_wq);
2658
2659         return ret;
2660 }
2661
2662 static void __exit isert_exit(void)
2663 {
2664         flush_scheduled_work();
2665         destroy_workqueue(isert_release_wq);
2666         destroy_workqueue(isert_comp_wq);
2667         iscsit_unregister_transport(&iser_target_transport);
2668         isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2669 }
2670
2671 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2672 MODULE_VERSION("1.0");
2673 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2674 MODULE_LICENSE("GPL");
2675
2676 module_init(isert_init);
2677 module_exit(isert_exit);