drivers/infiniband/ulp/isert/ib_isert.c

   1 /*******************************************************************************
   2  * This file contains iSCSI extentions for RDMA (iSER) Verbs
   3  *
   4  * (c) Copyright 2013 Datera, Inc.
   5  *
   6  * Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ****************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/module.h>
  21 #include <linux/scatterlist.h>
  22 #include <linux/socket.h>
  23 #include <linux/in.h>
  24 #include <linux/in6.h>
  25 #include <rdma/ib_verbs.h>
  26 #include <rdma/rdma_cm.h>
  27 #include <target/target_core_base.h>
  28 #include <target/target_core_fabric.h>
  29 #include <target/iscsi/iscsi_transport.h>
  30 #include <linux/semaphore.h>
  31
  32 #include "ib_isert.h"
  33
  34 #define ISERT_MAX_CONN          8
  35 #define ISER_MAX_RX_CQ_LEN      (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
  36 #define ISER_MAX_TX_CQ_LEN \
  37         ((ISERT_QP_MAX_REQ_DTOS + ISCSI_DEF_XMIT_CMDS_MAX) * ISERT_MAX_CONN)
  38 #define ISER_MAX_CQ_LEN         (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \
  39                                  ISERT_MAX_CONN)
  40
  41 static int isert_debug_level;
  42 module_param_named(debug_level, isert_debug_level, int, 0644);
  43 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
  44
  45 static DEFINE_MUTEX(device_list_mutex);
  46 static LIST_HEAD(device_list);
  47 static struct workqueue_struct *isert_comp_wq;
  48 static struct workqueue_struct *isert_release_wq;
  49
  50 static int
  51 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
  52 static int
  53 isert_login_post_recv(struct isert_conn *isert_conn);
  54 static int
  55 isert_rdma_accept(struct isert_conn *isert_conn);
  56 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
  57
  58 static void isert_release_work(struct work_struct *work);
  59 static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc);
  60 static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
  61 static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
  62 static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc);
  63
  64 static inline bool
  65 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
  66 {
  67         return (conn->pi_support &&
  68                 cmd->prot_op != TARGET_PROT_NORMAL);
  69 }
  70
  71
  72 static void
  73 isert_qp_event_callback(struct ib_event *e, void *context)
  74 {
  75         struct isert_conn *isert_conn = context;
  76
  77         isert_err("%s (%d): conn %p\n",
  78                   ib_event_msg(e->event), e->event, isert_conn);
  79
  80         switch (e->event) {
  81         case IB_EVENT_COMM_EST:
  82                 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
  83                 break;
  84         case IB_EVENT_QP_LAST_WQE_REACHED:
  85                 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
  86                 break;
  87         default:
  88                 break;
  89         }
  90 }
  91
  92 static struct isert_comp *
  93 isert_comp_get(struct isert_conn *isert_conn)
  94 {
  95         struct isert_device *device = isert_conn->device;
  96         struct isert_comp *comp;
  97         int i, min = 0;
  98
  99         mutex_lock(&device_list_mutex);
 100         for (i = 0; i < device->comps_used; i++)
 101                 if (device->comps[i].active_qps <
 102                     device->comps[min].active_qps)
 103                         min = i;
 104         comp = &device->comps[min];
 105         comp->active_qps++;
 106         mutex_unlock(&device_list_mutex);
 107
 108         isert_info("conn %p, using comp %p min_index: %d\n",
 109                    isert_conn, comp, min);
 110
 111         return comp;
 112 }
 113
 114 static void
 115 isert_comp_put(struct isert_comp *comp)
 116 {
 117         mutex_lock(&device_list_mutex);
 118         comp->active_qps--;
 119         mutex_unlock(&device_list_mutex);
 120 }
 121
 122 static struct ib_qp *
 123 isert_create_qp(struct isert_conn *isert_conn,
 124                 struct isert_comp *comp,
 125                 struct rdma_cm_id *cma_id)
 126 {
 127         struct isert_device *device = isert_conn->device;
 128         struct ib_qp_init_attr attr;
 129         int ret;
 130
 131         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 132         attr.event_handler = isert_qp_event_callback;
 133         attr.qp_context = isert_conn;
 134         attr.send_cq = comp->cq;
 135         attr.recv_cq = comp->cq;
 136         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1;
 137         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
 138         attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX;
 139         attr.cap.max_send_sge = device->ib_device->attrs.max_sge;
 140         attr.cap.max_recv_sge = 1;
 141         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 142         attr.qp_type = IB_QPT_RC;
 143         if (device->pi_capable)
 144                 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
 145
 146         ret = rdma_create_qp(cma_id, device->pd, &attr);
 147         if (ret) {
 148                 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
 149                 return ERR_PTR(ret);
 150         }
 151
 152         return cma_id->qp;
 153 }
 154
 155 static int
 156 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
 157 {
 158         struct isert_comp *comp;
 159         int ret;
 160
 161         comp = isert_comp_get(isert_conn);
 162         isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
 163         if (IS_ERR(isert_conn->qp)) {
 164                 ret = PTR_ERR(isert_conn->qp);
 165                 goto err;
 166         }
 167
 168         return 0;
 169 err:
 170         isert_comp_put(comp);
 171         return ret;
 172 }
 173
 174 static int
 175 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 176 {
 177         struct isert_device *device = isert_conn->device;
 178         struct ib_device *ib_dev = device->ib_device;
 179         struct iser_rx_desc *rx_desc;
 180         struct ib_sge *rx_sg;
 181         u64 dma_addr;
 182         int i, j;
 183
 184         isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 185                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 186         if (!isert_conn->rx_descs)
 187                 goto fail;
 188
 189         rx_desc = isert_conn->rx_descs;
 190
 191         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 192                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 193                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 194                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 195                         goto dma_map_fail;
 196
 197                 rx_desc->dma_addr = dma_addr;
 198
 199                 rx_sg = &rx_desc->rx_sg;
 200                 rx_sg->addr = rx_desc->dma_addr;
 201                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 202                 rx_sg->lkey = device->pd->local_dma_lkey;
 203                 rx_desc->rx_cqe.done = isert_recv_done;
 204         }
 205
 206         return 0;
 207
 208 dma_map_fail:
 209         rx_desc = isert_conn->rx_descs;
 210         for (j = 0; j < i; j++, rx_desc++) {
 211                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 212                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 213         }
 214         kfree(isert_conn->rx_descs);
 215         isert_conn->rx_descs = NULL;
 216 fail:
 217         isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
 218
 219         return -ENOMEM;
 220 }
 221
 222 static void
 223 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 224 {
 225         struct ib_device *ib_dev = isert_conn->device->ib_device;
 226         struct iser_rx_desc *rx_desc;
 227         int i;
 228
 229         if (!isert_conn->rx_descs)
 230                 return;
 231
 232         rx_desc = isert_conn->rx_descs;
 233         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 234                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 235                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 236         }
 237
 238         kfree(isert_conn->rx_descs);
 239         isert_conn->rx_descs = NULL;
 240 }
 241
 242 static void
 243 isert_free_comps(struct isert_device *device)
 244 {
 245         int i;
 246
 247         for (i = 0; i < device->comps_used; i++) {
 248                 struct isert_comp *comp = &device->comps[i];
 249
 250                 if (comp->cq)
 251                         ib_free_cq(comp->cq);
 252         }
 253         kfree(device->comps);
 254 }
 255
 256 static int
 257 isert_alloc_comps(struct isert_device *device)
 258 {
 259         int i, max_cqe, ret = 0;
 260
 261         device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
 262                                  device->ib_device->num_comp_vectors));
 263
 264         isert_info("Using %d CQs, %s supports %d vectors support "
 265                    "pi_capable %d\n",
 266                    device->comps_used, device->ib_device->name,
 267                    device->ib_device->num_comp_vectors,
 268                    device->pi_capable);
 269
 270         device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
 271                                 GFP_KERNEL);
 272         if (!device->comps) {
 273                 isert_err("Unable to allocate completion contexts\n");
 274                 return -ENOMEM;
 275         }
 276
 277         max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
 278
 279         for (i = 0; i < device->comps_used; i++) {
 280                 struct isert_comp *comp = &device->comps[i];
 281
 282                 comp->device = device;
 283                 comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i,
 284                                 IB_POLL_WORKQUEUE);
 285                 if (IS_ERR(comp->cq)) {
 286                         isert_err("Unable to allocate cq\n");
 287                         ret = PTR_ERR(comp->cq);
 288                         comp->cq = NULL;
 289                         goto out_cq;
 290                 }
 291         }
 292
 293         return 0;
 294 out_cq:
 295         isert_free_comps(device);
 296         return ret;
 297 }
 298
 299 static int
 300 isert_create_device_ib_res(struct isert_device *device)
 301 {
 302         struct ib_device *ib_dev = device->ib_device;
 303         int ret;
 304
 305         isert_dbg("devattr->max_sge: %d\n", ib_dev->attrs.max_sge);
 306         isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
 307
 308         ret = isert_alloc_comps(device);
 309         if (ret)
 310                 goto out;
 311
 312         device->pd = ib_alloc_pd(ib_dev, 0);
 313         if (IS_ERR(device->pd)) {
 314                 ret = PTR_ERR(device->pd);
 315                 isert_err("failed to allocate pd, device %p, ret=%d\n",
 316                           device, ret);
 317                 goto out_cq;
 318         }
 319
 320         /* Check signature cap */
 321         device->pi_capable = ib_dev->attrs.device_cap_flags &
 322                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 323
 324         return 0;
 325
 326 out_cq:
 327         isert_free_comps(device);
 328 out:
 329         if (ret > 0)
 330                 ret = -EINVAL;
 331         return ret;
 332 }
 333
 334 static void
 335 isert_free_device_ib_res(struct isert_device *device)
 336 {
 337         isert_info("device %p\n", device);
 338
 339         ib_dealloc_pd(device->pd);
 340         isert_free_comps(device);
 341 }
 342
 343 static void
 344 isert_device_put(struct isert_device *device)
 345 {
 346         mutex_lock(&device_list_mutex);
 347         device->refcount--;
 348         isert_info("device %p refcount %d\n", device, device->refcount);
 349         if (!device->refcount) {
 350                 isert_free_device_ib_res(device);
 351                 list_del(&device->dev_node);
 352                 kfree(device);
 353         }
 354         mutex_unlock(&device_list_mutex);
 355 }
 356
 357 static struct isert_device *
 358 isert_device_get(struct rdma_cm_id *cma_id)
 359 {
 360         struct isert_device *device;
 361         int ret;
 362
 363         mutex_lock(&device_list_mutex);
 364         list_for_each_entry(device, &device_list, dev_node) {
 365                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 366                         device->refcount++;
 367                         isert_info("Found iser device %p refcount %d\n",
 368                                    device, device->refcount);
 369                         mutex_unlock(&device_list_mutex);
 370                         return device;
 371                 }
 372         }
 373
 374         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 375         if (!device) {
 376                 mutex_unlock(&device_list_mutex);
 377                 return ERR_PTR(-ENOMEM);
 378         }
 379
 380         INIT_LIST_HEAD(&device->dev_node);
 381
 382         device->ib_device = cma_id->device;
 383         ret = isert_create_device_ib_res(device);
 384         if (ret) {
 385                 kfree(device);
 386                 mutex_unlock(&device_list_mutex);
 387                 return ERR_PTR(ret);
 388         }
 389
 390         device->refcount++;
 391         list_add_tail(&device->dev_node, &device_list);
 392         isert_info("Created a new iser device %p refcount %d\n",
 393                    device, device->refcount);
 394         mutex_unlock(&device_list_mutex);
 395
 396         return device;
 397 }
 398
 399 static void
 400 isert_init_conn(struct isert_conn *isert_conn)
 401 {
 402         isert_conn->state = ISER_CONN_INIT;
 403         INIT_LIST_HEAD(&isert_conn->node);
 404         init_completion(&isert_conn->login_comp);
 405         init_completion(&isert_conn->login_req_comp);
 406         init_waitqueue_head(&isert_conn->rem_wait);
 407         kref_init(&isert_conn->kref);
 408         mutex_init(&isert_conn->mutex);
 409         INIT_WORK(&isert_conn->release_work, isert_release_work);
 410 }
 411
 412 static void
 413 isert_free_login_buf(struct isert_conn *isert_conn)
 414 {
 415         struct ib_device *ib_dev = isert_conn->device->ib_device;
 416
 417         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 418                             ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
 419         kfree(isert_conn->login_rsp_buf);
 420
 421         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 422                             ISER_RX_PAYLOAD_SIZE,
 423                             DMA_FROM_DEVICE);
 424         kfree(isert_conn->login_req_buf);
 425 }
 426
 427 static int
 428 isert_alloc_login_buf(struct isert_conn *isert_conn,
 429                       struct ib_device *ib_dev)
 430 {
 431         int ret;
 432
 433         isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
 434                         GFP_KERNEL);
 435         if (!isert_conn->login_req_buf) {
 436                 isert_err("Unable to allocate isert_conn->login_buf\n");
 437                 return -ENOMEM;
 438         }
 439
 440         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 441                                 isert_conn->login_req_buf,
 442                                 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 443         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 444         if (ret) {
 445                 isert_err("login_req_dma mapping error: %d\n", ret);
 446                 isert_conn->login_req_dma = 0;
 447                 goto out_free_login_req_buf;
 448         }
 449
 450         isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
 451         if (!isert_conn->login_rsp_buf) {
 452                 ret = -ENOMEM;
 453                 goto out_unmap_login_req_buf;
 454         }
 455
 456         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 457                                         isert_conn->login_rsp_buf,
 458                                         ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
 459         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 460         if (ret) {
 461                 isert_err("login_rsp_dma mapping error: %d\n", ret);
 462                 isert_conn->login_rsp_dma = 0;
 463                 goto out_free_login_rsp_buf;
 464         }
 465
 466         return 0;
 467
 468 out_free_login_rsp_buf:
 469         kfree(isert_conn->login_rsp_buf);
 470 out_unmap_login_req_buf:
 471         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 472                             ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 473 out_free_login_req_buf:
 474         kfree(isert_conn->login_req_buf);
 475         return ret;
 476 }
 477
 478 static void
 479 isert_set_nego_params(struct isert_conn *isert_conn,
 480                       struct rdma_conn_param *param)
 481 {
 482         struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
 483
 484         /* Set max inflight RDMA READ requests */
 485         isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
 486                                 attr->max_qp_init_rd_atom);
 487         isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
 488
 489         if (param->private_data) {
 490                 u8 flags = *(u8 *)param->private_data;
 491
 492                 /*
 493                  * use remote invalidation if the both initiator
 494                  * and the HCA support it
 495                  */
 496                 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
 497                                           (attr->device_cap_flags &
 498                                            IB_DEVICE_MEM_MGT_EXTENSIONS);
 499                 if (isert_conn->snd_w_inv)
 500                         isert_info("Using remote invalidation\n");
 501         }
 502 }
 503
 504 static int
 505 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 506 {
 507         struct isert_np *isert_np = cma_id->context;
 508         struct iscsi_np *np = isert_np->np;
 509         struct isert_conn *isert_conn;
 510         struct isert_device *device;
 511         int ret = 0;
 512
 513         spin_lock_bh(&np->np_thread_lock);
 514         if (!np->enabled) {
 515                 spin_unlock_bh(&np->np_thread_lock);
 516                 isert_dbg("iscsi_np is not enabled, reject connect request\n");
 517                 return rdma_reject(cma_id, NULL, 0);
 518         }
 519         spin_unlock_bh(&np->np_thread_lock);
 520
 521         isert_dbg("cma_id: %p, portal: %p\n",
 522                  cma_id, cma_id->context);
 523
 524         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 525         if (!isert_conn)
 526                 return -ENOMEM;
 527
 528         isert_init_conn(isert_conn);
 529         isert_conn->cm_id = cma_id;
 530
 531         ret = isert_alloc_login_buf(isert_conn, cma_id->device);
 532         if (ret)
 533                 goto out;
 534
 535         device = isert_device_get(cma_id);
 536         if (IS_ERR(device)) {
 537                 ret = PTR_ERR(device);
 538                 goto out_rsp_dma_map;
 539         }
 540         isert_conn->device = device;
 541
 542         isert_set_nego_params(isert_conn, &event->param.conn);
 543
 544         ret = isert_conn_setup_qp(isert_conn, cma_id);
 545         if (ret)
 546                 goto out_conn_dev;
 547
 548         ret = isert_login_post_recv(isert_conn);
 549         if (ret)
 550                 goto out_conn_dev;
 551
 552         ret = isert_rdma_accept(isert_conn);
 553         if (ret)
 554                 goto out_conn_dev;
 555
 556         mutex_lock(&isert_np->mutex);
 557         list_add_tail(&isert_conn->node, &isert_np->accepted);
 558         mutex_unlock(&isert_np->mutex);
 559
 560         return 0;
 561
 562 out_conn_dev:
 563         isert_device_put(device);
 564 out_rsp_dma_map:
 565         isert_free_login_buf(isert_conn);
 566 out:
 567         kfree(isert_conn);
 568         rdma_reject(cma_id, NULL, 0);
 569         return ret;
 570 }
 571
 572 static void
 573 isert_connect_release(struct isert_conn *isert_conn)
 574 {
 575         struct isert_device *device = isert_conn->device;
 576
 577         isert_dbg("conn %p\n", isert_conn);
 578
 579         BUG_ON(!device);
 580
 581         isert_free_rx_descriptors(isert_conn);
 582         if (isert_conn->cm_id &&
 583             !isert_conn->dev_removed)
 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         if (isert_conn->dev_removed)
 599                 wake_up_interruptible(&isert_conn->rem_wait);
 600         else
 601                 kfree(isert_conn);
 602 }
 603
 604 static void
 605 isert_connected_handler(struct rdma_cm_id *cma_id)
 606 {
 607         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 608         struct isert_np *isert_np = cma_id->context;
 609
 610         isert_info("conn %p\n", isert_conn);
 611
 612         mutex_lock(&isert_conn->mutex);
 613         isert_conn->state = ISER_CONN_UP;
 614         kref_get(&isert_conn->kref);
 615         mutex_unlock(&isert_conn->mutex);
 616
 617         mutex_lock(&isert_np->mutex);
 618         list_move_tail(&isert_conn->node, &isert_np->pending);
 619         mutex_unlock(&isert_np->mutex);
 620
 621         isert_info("np %p: Allow accept_np to continue\n", isert_np);
 622         up(&isert_np->sem);
 623 }
 624
 625 static void
 626 isert_release_kref(struct kref *kref)
 627 {
 628         struct isert_conn *isert_conn = container_of(kref,
 629                                 struct isert_conn, kref);
 630
 631         isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
 632                    current->pid);
 633
 634         isert_connect_release(isert_conn);
 635 }
 636
 637 static void
 638 isert_put_conn(struct isert_conn *isert_conn)
 639 {
 640         kref_put(&isert_conn->kref, isert_release_kref);
 641 }
 642
 643 static void
 644 isert_handle_unbound_conn(struct isert_conn *isert_conn)
 645 {
 646         struct isert_np *isert_np = isert_conn->cm_id->context;
 647
 648         mutex_lock(&isert_np->mutex);
 649         if (!list_empty(&isert_conn->node)) {
 650                 /*
 651                  * This means iscsi doesn't know this connection
 652                  * so schedule a cleanup ourselves
 653                  */
 654                 list_del_init(&isert_conn->node);
 655                 isert_put_conn(isert_conn);
 656                 queue_work(isert_release_wq, &isert_conn->release_work);
 657         }
 658         mutex_unlock(&isert_np->mutex);
 659 }
 660
 661 /**
 662  * isert_conn_terminate() - Initiate connection termination
 663  * @isert_conn: isert connection struct
 664  *
 665  * Notes:
 666  * In case the connection state is BOUND, move state
 667  * to TEMINATING and start teardown sequence (rdma_disconnect).
 668  * In case the connection state is UP, complete flush as well.
 669  *
 670  * This routine must be called with mutex held. Thus it is
 671  * safe to call multiple times.
 672  */
 673 static void
 674 isert_conn_terminate(struct isert_conn *isert_conn)
 675 {
 676         int err;
 677
 678         if (isert_conn->state >= ISER_CONN_TERMINATING)
 679                 return;
 680
 681         isert_info("Terminating conn %p state %d\n",
 682                    isert_conn, isert_conn->state);
 683         isert_conn->state = ISER_CONN_TERMINATING;
 684         err = rdma_disconnect(isert_conn->cm_id);
 685         if (err)
 686                 isert_warn("Failed rdma_disconnect isert_conn %p\n",
 687                            isert_conn);
 688 }
 689
 690 static int
 691 isert_np_cma_handler(struct isert_np *isert_np,
 692                      enum rdma_cm_event_type event)
 693 {
 694         isert_dbg("%s (%d): isert np %p\n",
 695                   rdma_event_msg(event), event, isert_np);
 696
 697         switch (event) {
 698         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 699                 isert_np->cm_id = NULL;
 700                 break;
 701         case RDMA_CM_EVENT_ADDR_CHANGE:
 702                 isert_np->cm_id = isert_setup_id(isert_np);
 703                 if (IS_ERR(isert_np->cm_id)) {
 704                         isert_err("isert np %p setup id failed: %ld\n",
 705                                   isert_np, PTR_ERR(isert_np->cm_id));
 706                         isert_np->cm_id = NULL;
 707                 }
 708                 break;
 709         default:
 710                 isert_err("isert np %p Unexpected event %d\n",
 711                           isert_np, event);
 712         }
 713
 714         return -1;
 715 }
 716
 717 static int
 718 isert_disconnected_handler(struct rdma_cm_id *cma_id,
 719                            enum rdma_cm_event_type event)
 720 {
 721         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 722
 723         mutex_lock(&isert_conn->mutex);
 724         switch (isert_conn->state) {
 725         case ISER_CONN_TERMINATING:
 726                 break;
 727         case ISER_CONN_UP:
 728                 isert_conn_terminate(isert_conn);
 729                 ib_drain_qp(isert_conn->qp);
 730                 isert_handle_unbound_conn(isert_conn);
 731                 break;
 732         case ISER_CONN_BOUND:
 733         case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
 734                 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
 735                 break;
 736         default:
 737                 isert_warn("conn %p teminating in state %d\n",
 738                            isert_conn, isert_conn->state);
 739         }
 740         mutex_unlock(&isert_conn->mutex);
 741
 742         return 0;
 743 }
 744
 745 static int
 746 isert_connect_error(struct rdma_cm_id *cma_id)
 747 {
 748         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 749
 750         list_del_init(&isert_conn->node);
 751         isert_conn->cm_id = NULL;
 752         isert_put_conn(isert_conn);
 753
 754         return -1;
 755 }
 756
 757 static int
 758 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 759 {
 760         struct isert_np *isert_np = cma_id->context;
 761         struct isert_conn *isert_conn;
 762         int ret = 0;
 763
 764         isert_info("%s (%d): status %d id %p np %p\n",
 765                    rdma_event_msg(event->event), event->event,
 766                    event->status, cma_id, cma_id->context);
 767
 768         if (isert_np->cm_id == cma_id)
 769                 return isert_np_cma_handler(cma_id->context, event->event);
 770
 771         switch (event->event) {
 772         case RDMA_CM_EVENT_CONNECT_REQUEST:
 773                 ret = isert_connect_request(cma_id, event);
 774                 if (ret)
 775                         isert_err("failed handle connect request %d\n", ret);
 776                 break;
 777         case RDMA_CM_EVENT_ESTABLISHED:
 778                 isert_connected_handler(cma_id);
 779                 break;
 780         case RDMA_CM_EVENT_ADDR_CHANGE:    /* FALLTHRU */
 781         case RDMA_CM_EVENT_DISCONNECTED:   /* FALLTHRU */
 782         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
 783                 ret = isert_disconnected_handler(cma_id, event->event);
 784                 break;
 785         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 786                 isert_conn = cma_id->qp->qp_context;
 787                 isert_conn->dev_removed = true;
 788                 isert_disconnected_handler(cma_id, event->event);
 789                 wait_event_interruptible(isert_conn->rem_wait,
 790                                          isert_conn->state == ISER_CONN_DOWN);
 791                 kfree(isert_conn);
 792                 /*
 793                  * return non-zero from the callback to destroy
 794                  * the rdma cm id
 795                  */
 796                 return 1;
 797         case RDMA_CM_EVENT_REJECTED:       /* FALLTHRU */
 798         case RDMA_CM_EVENT_UNREACHABLE:    /* FALLTHRU */
 799         case RDMA_CM_EVENT_CONNECT_ERROR:
 800                 ret = isert_connect_error(cma_id);
 801                 break;
 802         default:
 803                 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
 804                 break;
 805         }
 806
 807         return ret;
 808 }
 809
 810 static int
 811 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
 812 {
 813         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 814         int i, ret;
 815         struct iser_rx_desc *rx_desc;
 816
 817         for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
 818                 rx_desc = &isert_conn->rx_descs[i];
 819
 820                 rx_wr->wr_cqe = &rx_desc->rx_cqe;
 821                 rx_wr->sg_list = &rx_desc->rx_sg;
 822                 rx_wr->num_sge = 1;
 823                 rx_wr->next = rx_wr + 1;
 824         }
 825         rx_wr--;
 826         rx_wr->next = NULL; /* mark end of work requests list */
 827
 828         ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
 829                            &rx_wr_failed);
 830         if (ret)
 831                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 832
 833         return ret;
 834 }
 835
 836 static int
 837 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
 838 {
 839         struct ib_recv_wr *rx_wr_failed, rx_wr;
 840         int ret;
 841
 842         rx_wr.wr_cqe = &rx_desc->rx_cqe;
 843         rx_wr.sg_list = &rx_desc->rx_sg;
 844         rx_wr.num_sge = 1;
 845         rx_wr.next = NULL;
 846
 847         ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
 848         if (ret)
 849                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 850
 851         return ret;
 852 }
 853
 854 static int
 855 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 856 {
 857         struct ib_device *ib_dev = isert_conn->cm_id->device;
 858         struct ib_send_wr send_wr, *send_wr_failed;
 859         int ret;
 860
 861         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 862                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 863
 864         tx_desc->tx_cqe.done = isert_login_send_done;
 865
 866         send_wr.next    = NULL;
 867         send_wr.wr_cqe  = &tx_desc->tx_cqe;
 868         send_wr.sg_list = tx_desc->tx_sg;
 869         send_wr.num_sge = tx_desc->num_sge;
 870         send_wr.opcode  = IB_WR_SEND;
 871         send_wr.send_flags = IB_SEND_SIGNALED;
 872
 873         ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
 874         if (ret)
 875                 isert_err("ib_post_send() failed, ret: %d\n", ret);
 876
 877         return ret;
 878 }
 879
 880 static void
 881 isert_create_send_desc(struct isert_conn *isert_conn,
 882                        struct isert_cmd *isert_cmd,
 883                        struct iser_tx_desc *tx_desc)
 884 {
 885         struct isert_device *device = isert_conn->device;
 886         struct ib_device *ib_dev = device->ib_device;
 887
 888         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 889                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 890
 891         memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
 892         tx_desc->iser_header.flags = ISCSI_CTRL;
 893
 894         tx_desc->num_sge = 1;
 895
 896         if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
 897                 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
 898                 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 899         }
 900 }
 901
 902 static int
 903 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 904                    struct iser_tx_desc *tx_desc)
 905 {
 906         struct isert_device *device = isert_conn->device;
 907         struct ib_device *ib_dev = device->ib_device;
 908         u64 dma_addr;
 909
 910         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 911                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 912         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 913                 isert_err("ib_dma_mapping_error() failed\n");
 914                 return -ENOMEM;
 915         }
 916
 917         tx_desc->dma_addr = dma_addr;
 918         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 919         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 920         tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
 921
 922         isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
 923                   tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
 924                   tx_desc->tx_sg[0].lkey);
 925
 926         return 0;
 927 }
 928
 929 static void
 930 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 931                    struct ib_send_wr *send_wr)
 932 {
 933         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 934
 935         tx_desc->tx_cqe.done = isert_send_done;
 936         send_wr->wr_cqe = &tx_desc->tx_cqe;
 937
 938         if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
 939                 send_wr->opcode  = IB_WR_SEND_WITH_INV;
 940                 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
 941         } else {
 942                 send_wr->opcode = IB_WR_SEND;
 943         }
 944
 945         send_wr->sg_list = &tx_desc->tx_sg[0];
 946         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 947         send_wr->send_flags = IB_SEND_SIGNALED;
 948 }
 949
 950 static int
 951 isert_login_post_recv(struct isert_conn *isert_conn)
 952 {
 953         struct ib_recv_wr rx_wr, *rx_wr_fail;
 954         struct ib_sge sge;
 955         int ret;
 956
 957         memset(&sge, 0, sizeof(struct ib_sge));
 958         sge.addr = isert_conn->login_req_dma;
 959         sge.length = ISER_RX_PAYLOAD_SIZE;
 960         sge.lkey = isert_conn->device->pd->local_dma_lkey;
 961
 962         isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
 963                 sge.addr, sge.length, sge.lkey);
 964
 965         isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
 966
 967         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
 968         rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
 969         rx_wr.sg_list = &sge;
 970         rx_wr.num_sge = 1;
 971
 972         ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
 973         if (ret)
 974                 isert_err("ib_post_recv() failed: %d\n", ret);
 975
 976         return ret;
 977 }
 978
 979 static int
 980 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
 981                    u32 length)
 982 {
 983         struct isert_conn *isert_conn = conn->context;
 984         struct isert_device *device = isert_conn->device;
 985         struct ib_device *ib_dev = device->ib_device;
 986         struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
 987         int ret;
 988
 989         isert_create_send_desc(isert_conn, NULL, tx_desc);
 990
 991         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
 992                sizeof(struct iscsi_hdr));
 993
 994         isert_init_tx_hdrs(isert_conn, tx_desc);
 995
 996         if (length > 0) {
 997                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
 998
 999                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1000                                            length, DMA_TO_DEVICE);
1001
1002                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1003
1004                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1005                                               length, DMA_TO_DEVICE);
1006
1007                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1008                 tx_dsg->length  = length;
1009                 tx_dsg->lkey    = isert_conn->device->pd->local_dma_lkey;
1010                 tx_desc->num_sge = 2;
1011         }
1012         if (!login->login_failed) {
1013                 if (login->login_complete) {
1014                         ret = isert_alloc_rx_descriptors(isert_conn);
1015                         if (ret)
1016                                 return ret;
1017
1018                         ret = isert_post_recvm(isert_conn,
1019                                                ISERT_QP_MAX_RECV_DTOS);
1020                         if (ret)
1021                                 return ret;
1022
1023                         /* Now we are in FULL_FEATURE phase */
1024                         mutex_lock(&isert_conn->mutex);
1025                         isert_conn->state = ISER_CONN_FULL_FEATURE;
1026                         mutex_unlock(&isert_conn->mutex);
1027                         goto post_send;
1028                 }
1029
1030                 ret = isert_login_post_recv(isert_conn);
1031                 if (ret)
1032                         return ret;
1033         }
1034 post_send:
1035         ret = isert_login_post_send(isert_conn, tx_desc);
1036         if (ret)
1037                 return ret;
1038
1039         return 0;
1040 }
1041
1042 static void
1043 isert_rx_login_req(struct isert_conn *isert_conn)
1044 {
1045         struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1046         int rx_buflen = isert_conn->login_req_len;
1047         struct iscsi_conn *conn = isert_conn->conn;
1048         struct iscsi_login *login = conn->conn_login;
1049         int size;
1050
1051         isert_info("conn %p\n", isert_conn);
1052
1053         WARN_ON_ONCE(!login);
1054
1055         if (login->first_request) {
1056                 struct iscsi_login_req *login_req =
1057                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1058                 /*
1059                  * Setup the initial iscsi_login values from the leading
1060                  * login request PDU.
1061                  */
1062                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1063                 login->current_stage =
1064                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1065                          >> 2;
1066                 login->version_min      = login_req->min_version;
1067                 login->version_max      = login_req->max_version;
1068                 memcpy(login->isid, login_req->isid, 6);
1069                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1070                 login->init_task_tag    = login_req->itt;
1071                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1072                 login->cid              = be16_to_cpu(login_req->cid);
1073                 login->tsih             = be16_to_cpu(login_req->tsih);
1074         }
1075
1076         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1077
1078         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1079         isert_dbg("Using login payload size: %d, rx_buflen: %d "
1080                   "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1081                   MAX_KEY_VALUE_PAIRS);
1082         memcpy(login->req_buf, &rx_desc->data[0], size);
1083
1084         if (login->first_request) {
1085                 complete(&isert_conn->login_comp);
1086                 return;
1087         }
1088         schedule_delayed_work(&conn->login_work, 0);
1089 }
1090
1091 static struct iscsi_cmd
1092 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1093 {
1094         struct isert_conn *isert_conn = conn->context;
1095         struct isert_cmd *isert_cmd;
1096         struct iscsi_cmd *cmd;
1097
1098         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1099         if (!cmd) {
1100                 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1101                 return NULL;
1102         }
1103         isert_cmd = iscsit_priv_cmd(cmd);
1104         isert_cmd->conn = isert_conn;
1105         isert_cmd->iscsi_cmd = cmd;
1106         isert_cmd->rx_desc = rx_desc;
1107
1108         return cmd;
1109 }
1110
1111 static int
1112 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1113                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1114                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1115 {
1116         struct iscsi_conn *conn = isert_conn->conn;
1117         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1118         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1119         bool dump_payload = false;
1120         unsigned int data_len;
1121
1122         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1123         if (rc < 0)
1124                 return rc;
1125
1126         imm_data = cmd->immediate_data;
1127         imm_data_len = cmd->first_burst_len;
1128         unsol_data = cmd->unsolicited_data;
1129         data_len = cmd->se_cmd.data_length;
1130
1131         if (imm_data && imm_data_len == data_len)
1132                 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1133         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1134         if (rc < 0) {
1135                 return 0;
1136         } else if (rc > 0) {
1137                 dump_payload = true;
1138                 goto sequence_cmd;
1139         }
1140
1141         if (!imm_data)
1142                 return 0;
1143
1144         if (imm_data_len != data_len) {
1145                 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1146                 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1147                                     &rx_desc->data[0], imm_data_len);
1148                 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1149                           sg_nents, imm_data_len);
1150         } else {
1151                 sg_init_table(&isert_cmd->sg, 1);
1152                 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1153                 cmd->se_cmd.t_data_nents = 1;
1154                 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1155                 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1156                           imm_data_len);
1157         }
1158
1159         cmd->write_data_done += imm_data_len;
1160
1161         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1162                 spin_lock_bh(&cmd->istate_lock);
1163                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1164                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1165                 spin_unlock_bh(&cmd->istate_lock);
1166         }
1167
1168 sequence_cmd:
1169         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1170
1171         if (!rc && dump_payload == false && unsol_data)
1172                 iscsit_set_unsoliticed_dataout(cmd);
1173         else if (dump_payload && imm_data)
1174                 target_put_sess_cmd(&cmd->se_cmd);
1175
1176         return 0;
1177 }
1178
1179 static int
1180 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1181                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1182 {
1183         struct scatterlist *sg_start;
1184         struct iscsi_conn *conn = isert_conn->conn;
1185         struct iscsi_cmd *cmd = NULL;
1186         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1187         u32 unsol_data_len = ntoh24(hdr->dlength);
1188         int rc, sg_nents, sg_off, page_off;
1189
1190         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1191         if (rc < 0)
1192                 return rc;
1193         else if (!cmd)
1194                 return 0;
1195         /*
1196          * FIXME: Unexpected unsolicited_data out
1197          */
1198         if (!cmd->unsolicited_data) {
1199                 isert_err("Received unexpected solicited data payload\n");
1200                 dump_stack();
1201                 return -1;
1202         }
1203
1204         isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1205                   "write_data_done: %u, data_length: %u\n",
1206                   unsol_data_len,  cmd->write_data_done,
1207                   cmd->se_cmd.data_length);
1208
1209         sg_off = cmd->write_data_done / PAGE_SIZE;
1210         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1211         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1212         page_off = cmd->write_data_done % PAGE_SIZE;
1213         /*
1214          * FIXME: Non page-aligned unsolicited_data out
1215          */
1216         if (page_off) {
1217                 isert_err("unexpected non-page aligned data payload\n");
1218                 dump_stack();
1219                 return -1;
1220         }
1221         isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1222                   "sg_nents: %u from %p %u\n", sg_start, sg_off,
1223                   sg_nents, &rx_desc->data[0], unsol_data_len);
1224
1225         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1226                             unsol_data_len);
1227
1228         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1229         if (rc < 0)
1230                 return rc;
1231
1232         /*
1233          * multiple data-outs on the same command can arrive -
1234          * so post the buffer before hand
1235          */
1236         rc = isert_post_recv(isert_conn, rx_desc);
1237         if (rc) {
1238                 isert_err("ib_post_recv failed with %d\n", rc);
1239                 return rc;
1240         }
1241         return 0;
1242 }
1243
1244 static int
1245 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1246                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1247                      unsigned char *buf)
1248 {
1249         struct iscsi_conn *conn = isert_conn->conn;
1250         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1251         int rc;
1252
1253         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1254         if (rc < 0)
1255                 return rc;
1256         /*
1257          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1258          */
1259
1260         return iscsit_process_nop_out(conn, cmd, hdr);
1261 }
1262
1263 static int
1264 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1265                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1266                       struct iscsi_text *hdr)
1267 {
1268         struct iscsi_conn *conn = isert_conn->conn;
1269         u32 payload_length = ntoh24(hdr->dlength);
1270         int rc;
1271         unsigned char *text_in = NULL;
1272
1273         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1274         if (rc < 0)
1275                 return rc;
1276
1277         if (payload_length) {
1278                 text_in = kzalloc(payload_length, GFP_KERNEL);
1279                 if (!text_in) {
1280                         isert_err("Unable to allocate text_in of payload_length: %u\n",
1281                                   payload_length);
1282                         return -ENOMEM;
1283                 }
1284         }
1285         cmd->text_in_ptr = text_in;
1286
1287         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1288
1289         return iscsit_process_text_cmd(conn, cmd, hdr);
1290 }
1291
1292 static int
1293 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1294                 uint32_t read_stag, uint64_t read_va,
1295                 uint32_t write_stag, uint64_t write_va)
1296 {
1297         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1298         struct iscsi_conn *conn = isert_conn->conn;
1299         struct iscsi_cmd *cmd;
1300         struct isert_cmd *isert_cmd;
1301         int ret = -EINVAL;
1302         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1303
1304         if (conn->sess->sess_ops->SessionType &&
1305            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1306                 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1307                           " ignoring\n", opcode);
1308                 return 0;
1309         }
1310
1311         switch (opcode) {
1312         case ISCSI_OP_SCSI_CMD:
1313                 cmd = isert_allocate_cmd(conn, rx_desc);
1314                 if (!cmd)
1315                         break;
1316
1317                 isert_cmd = iscsit_priv_cmd(cmd);
1318                 isert_cmd->read_stag = read_stag;
1319                 isert_cmd->read_va = read_va;
1320                 isert_cmd->write_stag = write_stag;
1321                 isert_cmd->write_va = write_va;
1322                 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1323
1324                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1325                                         rx_desc, (unsigned char *)hdr);
1326                 break;
1327         case ISCSI_OP_NOOP_OUT:
1328                 cmd = isert_allocate_cmd(conn, rx_desc);
1329                 if (!cmd)
1330                         break;
1331
1332                 isert_cmd = iscsit_priv_cmd(cmd);
1333                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1334                                            rx_desc, (unsigned char *)hdr);
1335                 break;
1336         case ISCSI_OP_SCSI_DATA_OUT:
1337                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1338                                                 (unsigned char *)hdr);
1339                 break;
1340         case ISCSI_OP_SCSI_TMFUNC:
1341                 cmd = isert_allocate_cmd(conn, rx_desc);
1342                 if (!cmd)
1343                         break;
1344
1345                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1346                                                 (unsigned char *)hdr);
1347                 break;
1348         case ISCSI_OP_LOGOUT:
1349                 cmd = isert_allocate_cmd(conn, rx_desc);
1350                 if (!cmd)
1351                         break;
1352
1353                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1354                 break;
1355         case ISCSI_OP_TEXT:
1356                 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1357                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1358                 else
1359                         cmd = isert_allocate_cmd(conn, rx_desc);
1360
1361                 if (!cmd)
1362                         break;
1363
1364                 isert_cmd = iscsit_priv_cmd(cmd);
1365                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1366                                             rx_desc, (struct iscsi_text *)hdr);
1367                 break;
1368         default:
1369                 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1370                 dump_stack();
1371                 break;
1372         }
1373
1374         return ret;
1375 }
1376
1377 static void
1378 isert_print_wc(struct ib_wc *wc, const char *type)
1379 {
1380         if (wc->status != IB_WC_WR_FLUSH_ERR)
1381                 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1382                           ib_wc_status_msg(wc->status), wc->status,
1383                           wc->vendor_err);
1384         else
1385                 isert_dbg("%s failure: %s (%d)\n", type,
1386                           ib_wc_status_msg(wc->status), wc->status);
1387 }
1388
1389 static void
1390 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1391 {
1392         struct isert_conn *isert_conn = wc->qp->qp_context;
1393         struct ib_device *ib_dev = isert_conn->cm_id->device;
1394         struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1395         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1396         struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1397         uint64_t read_va = 0, write_va = 0;
1398         uint32_t read_stag = 0, write_stag = 0;
1399
1400         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1401                 isert_print_wc(wc, "recv");
1402                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1403                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1404                 return;
1405         }
1406
1407         ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1408                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1409
1410         isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1411                  rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1412                  (int)(wc->byte_len - ISER_HEADERS_LEN));
1413
1414         switch (iser_ctrl->flags & 0xF0) {
1415         case ISCSI_CTRL:
1416                 if (iser_ctrl->flags & ISER_RSV) {
1417                         read_stag = be32_to_cpu(iser_ctrl->read_stag);
1418                         read_va = be64_to_cpu(iser_ctrl->read_va);
1419                         isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1420                                   read_stag, (unsigned long long)read_va);
1421                 }
1422                 if (iser_ctrl->flags & ISER_WSV) {
1423                         write_stag = be32_to_cpu(iser_ctrl->write_stag);
1424                         write_va = be64_to_cpu(iser_ctrl->write_va);
1425                         isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1426                                   write_stag, (unsigned long long)write_va);
1427                 }
1428
1429                 isert_dbg("ISER ISCSI_CTRL PDU\n");
1430                 break;
1431         case ISER_HELLO:
1432                 isert_err("iSER Hello message\n");
1433                 break;
1434         default:
1435                 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1436                 break;
1437         }
1438
1439         isert_rx_opcode(isert_conn, rx_desc,
1440                         read_stag, read_va, write_stag, write_va);
1441
1442         ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1443                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1444 }
1445
1446 static void
1447 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1448 {
1449         struct isert_conn *isert_conn = wc->qp->qp_context;
1450         struct ib_device *ib_dev = isert_conn->cm_id->device;
1451
1452         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1453                 isert_print_wc(wc, "login recv");
1454                 return;
1455         }
1456
1457         ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1458                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1459
1460         isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1461
1462         if (isert_conn->conn) {
1463                 struct iscsi_login *login = isert_conn->conn->conn_login;
1464
1465                 if (login && !login->first_request)
1466                         isert_rx_login_req(isert_conn);
1467         }
1468
1469         mutex_lock(&isert_conn->mutex);
1470         complete(&isert_conn->login_req_comp);
1471         mutex_unlock(&isert_conn->mutex);
1472
1473         ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1474                                 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1475 }
1476
1477 static void
1478 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1479 {
1480         struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
1481         enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1482
1483         if (!cmd->rw.nr_ops)
1484                 return;
1485
1486         if (isert_prot_cmd(conn, se_cmd)) {
1487                 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1488                                 conn->cm_id->port_num, se_cmd->t_data_sg,
1489                                 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1490                                 se_cmd->t_prot_nents, dir);
1491         } else {
1492                 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1493                                 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1494         }
1495
1496         cmd->rw.nr_ops = 0;
1497 }
1498
1499 static void
1500 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1501 {
1502         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1503         struct isert_conn *isert_conn = isert_cmd->conn;
1504         struct iscsi_conn *conn = isert_conn->conn;
1505         struct iscsi_text_rsp *hdr;
1506
1507         isert_dbg("Cmd %p\n", isert_cmd);
1508
1509         switch (cmd->iscsi_opcode) {
1510         case ISCSI_OP_SCSI_CMD:
1511                 spin_lock_bh(&conn->cmd_lock);
1512                 if (!list_empty(&cmd->i_conn_node))
1513                         list_del_init(&cmd->i_conn_node);
1514                 spin_unlock_bh(&conn->cmd_lock);
1515
1516                 if (cmd->data_direction == DMA_TO_DEVICE) {
1517                         iscsit_stop_dataout_timer(cmd);
1518                         /*
1519                          * Check for special case during comp_err where
1520                          * WRITE_PENDING has been handed off from core,
1521                          * but requires an extra target_put_sess_cmd()
1522                          * before transport_generic_free_cmd() below.
1523                          */
1524                         if (comp_err &&
1525                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1526                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1527
1528                                 target_put_sess_cmd(se_cmd);
1529                         }
1530                 }
1531
1532                 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1533                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1534                 break;
1535         case ISCSI_OP_SCSI_TMFUNC:
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                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1542                 break;
1543         case ISCSI_OP_REJECT:
1544         case ISCSI_OP_NOOP_OUT:
1545         case ISCSI_OP_TEXT:
1546                 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1547                 /* If the continue bit is on, keep the command alive */
1548                 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1549                         break;
1550
1551                 spin_lock_bh(&conn->cmd_lock);
1552                 if (!list_empty(&cmd->i_conn_node))
1553                         list_del_init(&cmd->i_conn_node);
1554                 spin_unlock_bh(&conn->cmd_lock);
1555
1556                 /*
1557                  * Handle special case for REJECT when iscsi_add_reject*() has
1558                  * overwritten the original iscsi_opcode assignment, and the
1559                  * associated cmd->se_cmd needs to be released.
1560                  */
1561                 if (cmd->se_cmd.se_tfo != NULL) {
1562                         isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1563                                  cmd->iscsi_opcode);
1564                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1565                         break;
1566                 }
1567                 /*
1568                  * Fall-through
1569                  */
1570         default:
1571                 iscsit_release_cmd(cmd);
1572                 break;
1573         }
1574 }
1575
1576 static void
1577 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1578 {
1579         if (tx_desc->dma_addr != 0) {
1580                 isert_dbg("unmap single for tx_desc->dma_addr\n");
1581                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1582                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1583                 tx_desc->dma_addr = 0;
1584         }
1585 }
1586
1587 static void
1588 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1589                      struct ib_device *ib_dev, bool comp_err)
1590 {
1591         if (isert_cmd->pdu_buf_dma != 0) {
1592                 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1593                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1594                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1595                 isert_cmd->pdu_buf_dma = 0;
1596         }
1597
1598         isert_unmap_tx_desc(tx_desc, ib_dev);
1599         isert_put_cmd(isert_cmd, comp_err);
1600 }
1601
1602 static int
1603 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1604 {
1605         struct ib_mr_status mr_status;
1606         int ret;
1607
1608         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1609         if (ret) {
1610                 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1611                 goto fail_mr_status;
1612         }
1613
1614         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1615                 u64 sec_offset_err;
1616                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1617
1618                 switch (mr_status.sig_err.err_type) {
1619                 case IB_SIG_BAD_GUARD:
1620                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1621                         break;
1622                 case IB_SIG_BAD_REFTAG:
1623                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1624                         break;
1625                 case IB_SIG_BAD_APPTAG:
1626                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1627                         break;
1628                 }
1629                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1630                 do_div(sec_offset_err, block_size);
1631                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1632
1633                 isert_err("PI error found type %d at sector 0x%llx "
1634                           "expected 0x%x vs actual 0x%x\n",
1635                           mr_status.sig_err.err_type,
1636                           (unsigned long long)se_cmd->bad_sector,
1637                           mr_status.sig_err.expected,
1638                           mr_status.sig_err.actual);
1639                 ret = 1;
1640         }
1641
1642 fail_mr_status:
1643         return ret;
1644 }
1645
1646 static void
1647 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1648 {
1649         struct isert_conn *isert_conn = wc->qp->qp_context;
1650         struct isert_device *device = isert_conn->device;
1651         struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1652         struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1653         struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1654         int ret = 0;
1655
1656         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1657                 isert_print_wc(wc, "rdma write");
1658                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1659                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1660                 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1661                 return;
1662         }
1663
1664         isert_dbg("Cmd %p\n", isert_cmd);
1665
1666         ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr);
1667         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1668
1669         if (ret)
1670                 transport_send_check_condition_and_sense(cmd, cmd->pi_err, 0);
1671         else
1672                 isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1673 }
1674
1675 static void
1676 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1677 {
1678         struct isert_conn *isert_conn = wc->qp->qp_context;
1679         struct isert_device *device = isert_conn->device;
1680         struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1681         struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1682         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1683         struct se_cmd *se_cmd = &cmd->se_cmd;
1684         int ret = 0;
1685
1686         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1687                 isert_print_wc(wc, "rdma read");
1688                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1689                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1690                 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1691                 return;
1692         }
1693
1694         isert_dbg("Cmd %p\n", isert_cmd);
1695
1696         iscsit_stop_dataout_timer(cmd);
1697
1698         if (isert_prot_cmd(isert_conn, se_cmd))
1699                 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr);
1700         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1701         cmd->write_data_done = 0;
1702
1703         isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1704         spin_lock_bh(&cmd->istate_lock);
1705         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1706         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1707         spin_unlock_bh(&cmd->istate_lock);
1708
1709         if (ret) {
1710                 target_put_sess_cmd(se_cmd);
1711                 transport_send_check_condition_and_sense(se_cmd,
1712                                                          se_cmd->pi_err, 0);
1713         } else {
1714                 target_execute_cmd(se_cmd);
1715         }
1716 }
1717
1718 static void
1719 isert_do_control_comp(struct work_struct *work)
1720 {
1721         struct isert_cmd *isert_cmd = container_of(work,
1722                         struct isert_cmd, comp_work);
1723         struct isert_conn *isert_conn = isert_cmd->conn;
1724         struct ib_device *ib_dev = isert_conn->cm_id->device;
1725         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1726
1727         isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1728
1729         switch (cmd->i_state) {
1730         case ISTATE_SEND_TASKMGTRSP:
1731                 iscsit_tmr_post_handler(cmd, cmd->conn);
1732         case ISTATE_SEND_REJECT:   /* FALLTHRU */
1733         case ISTATE_SEND_TEXTRSP:  /* FALLTHRU */
1734                 cmd->i_state = ISTATE_SENT_STATUS;
1735                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1736                                      ib_dev, false);
1737                 break;
1738         case ISTATE_SEND_LOGOUTRSP:
1739                 iscsit_logout_post_handler(cmd, cmd->conn);
1740                 break;
1741         default:
1742                 isert_err("Unknown i_state %d\n", cmd->i_state);
1743                 dump_stack();
1744                 break;
1745         }
1746 }
1747
1748 static void
1749 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1750 {
1751         struct isert_conn *isert_conn = wc->qp->qp_context;
1752         struct ib_device *ib_dev = isert_conn->cm_id->device;
1753         struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1754
1755         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1756                 isert_print_wc(wc, "login send");
1757                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1758                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1759         }
1760
1761         isert_unmap_tx_desc(tx_desc, ib_dev);
1762 }
1763
1764 static void
1765 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1766 {
1767         struct isert_conn *isert_conn = wc->qp->qp_context;
1768         struct ib_device *ib_dev = isert_conn->cm_id->device;
1769         struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1770         struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1771
1772         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1773                 isert_print_wc(wc, "send");
1774                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1775                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1776                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1777                 return;
1778         }
1779
1780         isert_dbg("Cmd %p\n", isert_cmd);
1781
1782         switch (isert_cmd->iscsi_cmd->i_state) {
1783         case ISTATE_SEND_TASKMGTRSP:
1784         case ISTATE_SEND_LOGOUTRSP:
1785         case ISTATE_SEND_REJECT:
1786         case ISTATE_SEND_TEXTRSP:
1787                 isert_unmap_tx_desc(tx_desc, ib_dev);
1788
1789                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1790                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1791                 return;
1792         default:
1793                 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
1794                 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1795                 break;
1796         }
1797 }
1798
1799 static int
1800 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1801 {
1802         struct ib_send_wr *wr_failed;
1803         int ret;
1804
1805         ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1806         if (ret) {
1807                 isert_err("ib_post_recv failed with %d\n", ret);
1808                 return ret;
1809         }
1810
1811         ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
1812                            &wr_failed);
1813         if (ret) {
1814                 isert_err("ib_post_send failed with %d\n", ret);
1815                 return ret;
1816         }
1817         return ret;
1818 }
1819
1820 static int
1821 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1822 {
1823         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1824         struct isert_conn *isert_conn = conn->context;
1825         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1826         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1827                                 &isert_cmd->tx_desc.iscsi_header;
1828
1829         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1830         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1831         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1832         /*
1833          * Attach SENSE DATA payload to iSCSI Response PDU
1834          */
1835         if (cmd->se_cmd.sense_buffer &&
1836             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1837             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1838                 struct isert_device *device = isert_conn->device;
1839                 struct ib_device *ib_dev = device->ib_device;
1840                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1841                 u32 padding, pdu_len;
1842
1843                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1844                                    cmd->sense_buffer);
1845                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1846
1847                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1848                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1849                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1850
1851                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1852                                 (void *)cmd->sense_buffer, pdu_len,
1853                                 DMA_TO_DEVICE);
1854
1855                 isert_cmd->pdu_buf_len = pdu_len;
1856                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1857                 tx_dsg->length  = pdu_len;
1858                 tx_dsg->lkey    = device->pd->local_dma_lkey;
1859                 isert_cmd->tx_desc.num_sge = 2;
1860         }
1861
1862         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1863
1864         isert_dbg("Posting SCSI Response\n");
1865
1866         return isert_post_response(isert_conn, isert_cmd);
1867 }
1868
1869 static void
1870 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1871 {
1872         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1873         struct isert_conn *isert_conn = conn->context;
1874
1875         spin_lock_bh(&conn->cmd_lock);
1876         if (!list_empty(&cmd->i_conn_node))
1877                 list_del_init(&cmd->i_conn_node);
1878         spin_unlock_bh(&conn->cmd_lock);
1879
1880         if (cmd->data_direction == DMA_TO_DEVICE)
1881                 iscsit_stop_dataout_timer(cmd);
1882         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1883 }
1884
1885 static enum target_prot_op
1886 isert_get_sup_prot_ops(struct iscsi_conn *conn)
1887 {
1888         struct isert_conn *isert_conn = conn->context;
1889         struct isert_device *device = isert_conn->device;
1890
1891         if (conn->tpg->tpg_attrib.t10_pi) {
1892                 if (device->pi_capable) {
1893                         isert_info("conn %p PI offload enabled\n", isert_conn);
1894                         isert_conn->pi_support = true;
1895                         return TARGET_PROT_ALL;
1896                 }
1897         }
1898
1899         isert_info("conn %p PI offload disabled\n", isert_conn);
1900         isert_conn->pi_support = false;
1901
1902         return TARGET_PROT_NORMAL;
1903 }
1904
1905 static int
1906 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1907                 bool nopout_response)
1908 {
1909         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1910         struct isert_conn *isert_conn = conn->context;
1911         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1912
1913         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1914         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1915                                &isert_cmd->tx_desc.iscsi_header,
1916                                nopout_response);
1917         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1918         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1919
1920         isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1921
1922         return isert_post_response(isert_conn, isert_cmd);
1923 }
1924
1925 static int
1926 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1927 {
1928         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1929         struct isert_conn *isert_conn = conn->context;
1930         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1931
1932         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1933         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1934                                 &isert_cmd->tx_desc.iscsi_header);
1935         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1936         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1937
1938         isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1939
1940         return isert_post_response(isert_conn, isert_cmd);
1941 }
1942
1943 static int
1944 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1945 {
1946         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1947         struct isert_conn *isert_conn = conn->context;
1948         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1949
1950         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1951         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1952                                   &isert_cmd->tx_desc.iscsi_header);
1953         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1954         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1955
1956         isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1957
1958         return isert_post_response(isert_conn, isert_cmd);
1959 }
1960
1961 static int
1962 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1963 {
1964         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1965         struct isert_conn *isert_conn = conn->context;
1966         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1967         struct isert_device *device = isert_conn->device;
1968         struct ib_device *ib_dev = device->ib_device;
1969         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1970         struct iscsi_reject *hdr =
1971                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1972
1973         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1974         iscsit_build_reject(cmd, conn, hdr);
1975         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1976
1977         hton24(hdr->dlength, ISCSI_HDR_LEN);
1978         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1979                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1980                         DMA_TO_DEVICE);
1981         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1982         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1983         tx_dsg->length  = ISCSI_HDR_LEN;
1984         tx_dsg->lkey    = device->pd->local_dma_lkey;
1985         isert_cmd->tx_desc.num_sge = 2;
1986
1987         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1988
1989         isert_dbg("conn %p Posting Reject\n", isert_conn);
1990
1991         return isert_post_response(isert_conn, isert_cmd);
1992 }
1993
1994 static int
1995 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1996 {
1997         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1998         struct isert_conn *isert_conn = conn->context;
1999         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2000         struct iscsi_text_rsp *hdr =
2001                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2002         u32 txt_rsp_len;
2003         int rc;
2004
2005         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2006         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2007         if (rc < 0)
2008                 return rc;
2009
2010         txt_rsp_len = rc;
2011         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2012
2013         if (txt_rsp_len) {
2014                 struct isert_device *device = isert_conn->device;
2015                 struct ib_device *ib_dev = device->ib_device;
2016                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2017                 void *txt_rsp_buf = cmd->buf_ptr;
2018
2019                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2020                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2021
2022                 isert_cmd->pdu_buf_len = txt_rsp_len;
2023                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2024                 tx_dsg->length  = txt_rsp_len;
2025                 tx_dsg->lkey    = device->pd->local_dma_lkey;
2026                 isert_cmd->tx_desc.num_sge = 2;
2027         }
2028         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2029
2030         isert_dbg("conn %p Text Response\n", isert_conn);
2031
2032         return isert_post_response(isert_conn, isert_cmd);
2033 }
2034
2035 static inline void
2036 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2037                      struct ib_sig_domain *domain)
2038 {
2039         domain->sig_type = IB_SIG_TYPE_T10_DIF;
2040         domain->sig.dif.bg_type = IB_T10DIF_CRC;
2041         domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2042         domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2043         /*
2044          * At the moment we hard code those, but if in the future
2045          * the target core would like to use it, we will take it
2046          * from se_cmd.
2047          */
2048         domain->sig.dif.apptag_check_mask = 0xffff;
2049         domain->sig.dif.app_escape = true;
2050         domain->sig.dif.ref_escape = true;
2051         if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2052             se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2053                 domain->sig.dif.ref_remap = true;
2054 };
2055
2056 static int
2057 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2058 {
2059         memset(sig_attrs, 0, sizeof(*sig_attrs));
2060
2061         switch (se_cmd->prot_op) {
2062         case TARGET_PROT_DIN_INSERT:
2063         case TARGET_PROT_DOUT_STRIP:
2064                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2065                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2066                 break;
2067         case TARGET_PROT_DOUT_INSERT:
2068         case TARGET_PROT_DIN_STRIP:
2069                 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2070                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2071                 break;
2072         case TARGET_PROT_DIN_PASS:
2073         case TARGET_PROT_DOUT_PASS:
2074                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2075                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2076                 break;
2077         default:
2078                 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2079                 return -EINVAL;
2080         }
2081
2082         sig_attrs->check_mask =
2083                (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2084                (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2085                (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2086         return 0;
2087 }
2088
2089 static int
2090 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2091                 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2092 {
2093         struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
2094         enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2095         u8 port_num = conn->cm_id->port_num;
2096         u64 addr;
2097         u32 rkey, offset;
2098         int ret;
2099
2100         if (dir == DMA_FROM_DEVICE) {
2101                 addr = cmd->write_va;
2102                 rkey = cmd->write_stag;
2103                 offset = cmd->iscsi_cmd->write_data_done;
2104         } else {
2105                 addr = cmd->read_va;
2106                 rkey = cmd->read_stag;
2107                 offset = 0;
2108         }
2109
2110         if (isert_prot_cmd(conn, se_cmd)) {
2111                 struct ib_sig_attrs sig_attrs;
2112
2113                 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2114                 if (ret)
2115                         return ret;
2116
2117                 WARN_ON_ONCE(offset);
2118                 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2119                                 se_cmd->t_data_sg, se_cmd->t_data_nents,
2120                                 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2121                                 &sig_attrs, addr, rkey, dir);
2122         } else {
2123                 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2124                                 se_cmd->t_data_sg, se_cmd->t_data_nents,
2125                                 offset, addr, rkey, dir);
2126         }
2127         if (ret < 0) {
2128                 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2129                 return ret;
2130         }
2131
2132         ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2133         if (ret < 0)
2134                 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2135         return ret;
2136 }
2137
2138 static int
2139 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2140 {
2141         struct se_cmd *se_cmd = &cmd->se_cmd;
2142         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2143         struct isert_conn *isert_conn = conn->context;
2144         struct ib_cqe *cqe = NULL;
2145         struct ib_send_wr *chain_wr = NULL;
2146         int rc;
2147
2148         isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2149                  isert_cmd, se_cmd->data_length);
2150
2151         if (isert_prot_cmd(isert_conn, se_cmd)) {
2152                 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2153                 cqe = &isert_cmd->tx_desc.tx_cqe;
2154         } else {
2155                 /*
2156                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2157                  */
2158                 isert_create_send_desc(isert_conn, isert_cmd,
2159                                        &isert_cmd->tx_desc);
2160                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2161                                      &isert_cmd->tx_desc.iscsi_header);
2162                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2163                 isert_init_send_wr(isert_conn, isert_cmd,
2164                                    &isert_cmd->tx_desc.send_wr);
2165
2166                 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2167                 if (rc) {
2168                         isert_err("ib_post_recv failed with %d\n", rc);
2169                         return rc;
2170                 }
2171
2172                 chain_wr = &isert_cmd->tx_desc.send_wr;
2173         }
2174
2175         isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2176         isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n", isert_cmd);
2177         return 1;
2178 }
2179
2180 static int
2181 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2182 {
2183         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2184
2185         isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2186                  isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2187
2188         isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2189         isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2190                         &isert_cmd->tx_desc.tx_cqe, NULL);
2191
2192         isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2193                  isert_cmd);
2194         return 0;
2195 }
2196
2197 static int
2198 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2199 {
2200         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2201         int ret = 0;
2202
2203         switch (state) {
2204         case ISTATE_REMOVE:
2205                 spin_lock_bh(&conn->cmd_lock);
2206                 list_del_init(&cmd->i_conn_node);
2207                 spin_unlock_bh(&conn->cmd_lock);
2208                 isert_put_cmd(isert_cmd, true);
2209                 break;
2210         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2211                 ret = isert_put_nopin(cmd, conn, false);
2212                 break;
2213         default:
2214                 isert_err("Unknown immediate state: 0x%02x\n", state);
2215                 ret = -EINVAL;
2216                 break;
2217         }
2218
2219         return ret;
2220 }
2221
2222 static int
2223 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2224 {
2225         struct isert_conn *isert_conn = conn->context;
2226         int ret;
2227
2228         switch (state) {
2229         case ISTATE_SEND_LOGOUTRSP:
2230                 ret = isert_put_logout_rsp(cmd, conn);
2231                 if (!ret)
2232                         isert_conn->logout_posted = true;
2233                 break;
2234         case ISTATE_SEND_NOPIN:
2235                 ret = isert_put_nopin(cmd, conn, true);
2236                 break;
2237         case ISTATE_SEND_TASKMGTRSP:
2238                 ret = isert_put_tm_rsp(cmd, conn);
2239                 break;
2240         case ISTATE_SEND_REJECT:
2241                 ret = isert_put_reject(cmd, conn);
2242                 break;
2243         case ISTATE_SEND_TEXTRSP:
2244                 ret = isert_put_text_rsp(cmd, conn);
2245                 break;
2246         case ISTATE_SEND_STATUS:
2247                 /*
2248                  * Special case for sending non GOOD SCSI status from TX thread
2249                  * context during pre se_cmd excecution failure.
2250                  */
2251                 ret = isert_put_response(conn, cmd);
2252                 break;
2253         default:
2254                 isert_err("Unknown response state: 0x%02x\n", state);
2255                 ret = -EINVAL;
2256                 break;
2257         }
2258
2259         return ret;
2260 }
2261
2262 struct rdma_cm_id *
2263 isert_setup_id(struct isert_np *isert_np)
2264 {
2265         struct iscsi_np *np = isert_np->np;
2266         struct rdma_cm_id *id;
2267         struct sockaddr *sa;
2268         int ret;
2269
2270         sa = (struct sockaddr *)&np->np_sockaddr;
2271         isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2272
2273         id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2274                             RDMA_PS_TCP, IB_QPT_RC);
2275         if (IS_ERR(id)) {
2276                 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2277                 ret = PTR_ERR(id);
2278                 goto out;
2279         }
2280         isert_dbg("id %p context %p\n", id, id->context);
2281
2282         ret = rdma_bind_addr(id, sa);
2283         if (ret) {
2284                 isert_err("rdma_bind_addr() failed: %d\n", ret);
2285                 goto out_id;
2286         }
2287
2288         ret = rdma_listen(id, 0);
2289         if (ret) {
2290                 isert_err("rdma_listen() failed: %d\n", ret);
2291                 goto out_id;
2292         }
2293
2294         return id;
2295 out_id:
2296         rdma_destroy_id(id);
2297 out:
2298         return ERR_PTR(ret);
2299 }
2300
2301 static int
2302 isert_setup_np(struct iscsi_np *np,
2303                struct sockaddr_storage *ksockaddr)
2304 {
2305         struct isert_np *isert_np;
2306         struct rdma_cm_id *isert_lid;
2307         int ret;
2308
2309         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2310         if (!isert_np) {
2311                 isert_err("Unable to allocate struct isert_np\n");
2312                 return -ENOMEM;
2313         }
2314         sema_init(&isert_np->sem, 0);
2315         mutex_init(&isert_np->mutex);
2316         INIT_LIST_HEAD(&isert_np->accepted);
2317         INIT_LIST_HEAD(&isert_np->pending);
2318         isert_np->np = np;
2319
2320         /*
2321          * Setup the np->np_sockaddr from the passed sockaddr setup
2322          * in iscsi_target_configfs.c code..
2323          */
2324         memcpy(&np->np_sockaddr, ksockaddr,
2325                sizeof(struct sockaddr_storage));
2326
2327         isert_lid = isert_setup_id(isert_np);
2328         if (IS_ERR(isert_lid)) {
2329                 ret = PTR_ERR(isert_lid);
2330                 goto out;
2331         }
2332
2333         isert_np->cm_id = isert_lid;
2334         np->np_context = isert_np;
2335
2336         return 0;
2337
2338 out:
2339         kfree(isert_np);
2340
2341         return ret;
2342 }
2343
2344 static int
2345 isert_rdma_accept(struct isert_conn *isert_conn)
2346 {
2347         struct rdma_cm_id *cm_id = isert_conn->cm_id;
2348         struct rdma_conn_param cp;
2349         int ret;
2350         struct iser_cm_hdr rsp_hdr;
2351
2352         memset(&cp, 0, sizeof(struct rdma_conn_param));
2353         cp.initiator_depth = isert_conn->initiator_depth;
2354         cp.retry_count = 7;
2355         cp.rnr_retry_count = 7;
2356
2357         memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2358         rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2359         if (!isert_conn->snd_w_inv)
2360                 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2361         cp.private_data = (void *)&rsp_hdr;
2362         cp.private_data_len = sizeof(rsp_hdr);
2363
2364         ret = rdma_accept(cm_id, &cp);
2365         if (ret) {
2366                 isert_err("rdma_accept() failed with: %d\n", ret);
2367                 return ret;
2368         }
2369
2370         return 0;
2371 }
2372
2373 static int
2374 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2375 {
2376         struct isert_conn *isert_conn = conn->context;
2377         int ret;
2378
2379         isert_info("before login_req comp conn: %p\n", isert_conn);
2380         ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2381         if (ret) {
2382                 isert_err("isert_conn %p interrupted before got login req\n",
2383                           isert_conn);
2384                 return ret;
2385         }
2386         reinit_completion(&isert_conn->login_req_comp);
2387
2388         /*
2389          * For login requests after the first PDU, isert_rx_login_req() will
2390          * kick schedule_delayed_work(&conn->login_work) as the packet is
2391          * received, which turns this callback from iscsi_target_do_login_rx()
2392          * into a NOP.
2393          */
2394         if (!login->first_request)
2395                 return 0;
2396
2397         isert_rx_login_req(isert_conn);
2398
2399         isert_info("before login_comp conn: %p\n", conn);
2400         ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2401         if (ret)
2402                 return ret;
2403
2404         isert_info("processing login->req: %p\n", login->req);
2405
2406         return 0;
2407 }
2408
2409 static void
2410 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2411                     struct isert_conn *isert_conn)
2412 {
2413         struct rdma_cm_id *cm_id = isert_conn->cm_id;
2414         struct rdma_route *cm_route = &cm_id->route;
2415
2416         conn->login_family = np->np_sockaddr.ss_family;
2417
2418         conn->login_sockaddr = cm_route->addr.dst_addr;
2419         conn->local_sockaddr = cm_route->addr.src_addr;
2420 }
2421
2422 static int
2423 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2424 {
2425         struct isert_np *isert_np = np->np_context;
2426         struct isert_conn *isert_conn;
2427         int ret;
2428
2429 accept_wait:
2430         ret = down_interruptible(&isert_np->sem);
2431         if (ret)
2432                 return -ENODEV;
2433
2434         spin_lock_bh(&np->np_thread_lock);
2435         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2436                 spin_unlock_bh(&np->np_thread_lock);
2437                 isert_dbg("np_thread_state %d\n",
2438                          np->np_thread_state);
2439                 /**
2440                  * No point in stalling here when np_thread
2441                  * is in state RESET/SHUTDOWN/EXIT - bail
2442                  **/
2443                 return -ENODEV;
2444         }
2445         spin_unlock_bh(&np->np_thread_lock);
2446
2447         mutex_lock(&isert_np->mutex);
2448         if (list_empty(&isert_np->pending)) {
2449                 mutex_unlock(&isert_np->mutex);
2450                 goto accept_wait;
2451         }
2452         isert_conn = list_first_entry(&isert_np->pending,
2453                         struct isert_conn, node);
2454         list_del_init(&isert_conn->node);
2455         mutex_unlock(&isert_np->mutex);
2456
2457         conn->context = isert_conn;
2458         isert_conn->conn = conn;
2459         isert_conn->state = ISER_CONN_BOUND;
2460
2461         isert_set_conn_info(np, conn, isert_conn);
2462
2463         isert_dbg("Processing isert_conn: %p\n", isert_conn);
2464
2465         return 0;
2466 }
2467
2468 static void
2469 isert_free_np(struct iscsi_np *np)
2470 {
2471         struct isert_np *isert_np = np->np_context;
2472         struct isert_conn *isert_conn, *n;
2473
2474         if (isert_np->cm_id)
2475                 rdma_destroy_id(isert_np->cm_id);
2476
2477         /*
2478          * FIXME: At this point we don't have a good way to insure
2479          * that at this point we don't have hanging connections that
2480          * completed RDMA establishment but didn't start iscsi login
2481          * process. So work-around this by cleaning up what ever piled
2482          * up in accepted and pending lists.
2483          */
2484         mutex_lock(&isert_np->mutex);
2485         if (!list_empty(&isert_np->pending)) {
2486                 isert_info("Still have isert pending connections\n");
2487                 list_for_each_entry_safe(isert_conn, n,
2488                                          &isert_np->pending,
2489                                          node) {
2490                         isert_info("cleaning isert_conn %p state (%d)\n",
2491                                    isert_conn, isert_conn->state);
2492                         isert_connect_release(isert_conn);
2493                 }
2494         }
2495
2496         if (!list_empty(&isert_np->accepted)) {
2497                 isert_info("Still have isert accepted connections\n");
2498                 list_for_each_entry_safe(isert_conn, n,
2499                                          &isert_np->accepted,
2500                                          node) {
2501                         isert_info("cleaning isert_conn %p state (%d)\n",
2502                                    isert_conn, isert_conn->state);
2503                         isert_connect_release(isert_conn);
2504                 }
2505         }
2506         mutex_unlock(&isert_np->mutex);
2507
2508         np->np_context = NULL;
2509         kfree(isert_np);
2510 }
2511
2512 static void isert_release_work(struct work_struct *work)
2513 {
2514         struct isert_conn *isert_conn = container_of(work,
2515                                                      struct isert_conn,
2516                                                      release_work);
2517
2518         isert_info("Starting release conn %p\n", isert_conn);
2519
2520         mutex_lock(&isert_conn->mutex);
2521         isert_conn->state = ISER_CONN_DOWN;
2522         mutex_unlock(&isert_conn->mutex);
2523
2524         isert_info("Destroying conn %p\n", isert_conn);
2525         isert_put_conn(isert_conn);
2526 }
2527
2528 static void
2529 isert_wait4logout(struct isert_conn *isert_conn)
2530 {
2531         struct iscsi_conn *conn = isert_conn->conn;
2532
2533         isert_info("conn %p\n", isert_conn);
2534
2535         if (isert_conn->logout_posted) {
2536                 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2537                 wait_for_completion_timeout(&conn->conn_logout_comp,
2538                                             SECONDS_FOR_LOGOUT_COMP * HZ);
2539         }
2540 }
2541
2542 static void
2543 isert_wait4cmds(struct iscsi_conn *conn)
2544 {
2545         isert_info("iscsi_conn %p\n", conn);
2546
2547         if (conn->sess) {
2548                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2549                 target_wait_for_sess_cmds(conn->sess->se_sess);
2550         }
2551 }
2552
2553 /**
2554  * isert_put_unsol_pending_cmds() - Drop commands waiting for
2555  *     unsolicitate dataout
2556  * @conn:    iscsi connection
2557  *
2558  * We might still have commands that are waiting for unsolicited
2559  * dataouts messages. We must put the extra reference on those
2560  * before blocking on the target_wait_for_session_cmds
2561  */
2562 static void
2563 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
2564 {
2565         struct iscsi_cmd *cmd, *tmp;
2566         static LIST_HEAD(drop_cmd_list);
2567
2568         spin_lock_bh(&conn->cmd_lock);
2569         list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2570                 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2571                     (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2572                     (cmd->write_data_done < cmd->se_cmd.data_length))
2573                         list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2574         }
2575         spin_unlock_bh(&conn->cmd_lock);
2576
2577         list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2578                 list_del_init(&cmd->i_conn_node);
2579                 if (cmd->i_state != ISTATE_REMOVE) {
2580                         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2581
2582                         isert_info("conn %p dropping cmd %p\n", conn, cmd);
2583                         isert_put_cmd(isert_cmd, true);
2584                 }
2585         }
2586 }
2587
2588 static void isert_wait_conn(struct iscsi_conn *conn)
2589 {
2590         struct isert_conn *isert_conn = conn->context;
2591
2592         isert_info("Starting conn %p\n", isert_conn);
2593
2594         mutex_lock(&isert_conn->mutex);
2595         isert_conn_terminate(isert_conn);
2596         mutex_unlock(&isert_conn->mutex);
2597
2598         ib_drain_qp(isert_conn->qp);
2599         isert_put_unsol_pending_cmds(conn);
2600         isert_wait4cmds(conn);
2601         isert_wait4logout(isert_conn);
2602
2603         queue_work(isert_release_wq, &isert_conn->release_work);
2604 }
2605
2606 static void isert_free_conn(struct iscsi_conn *conn)
2607 {
2608         struct isert_conn *isert_conn = conn->context;
2609
2610         ib_drain_qp(isert_conn->qp);
2611         isert_put_conn(isert_conn);
2612 }
2613
2614 static void isert_get_rx_pdu(struct iscsi_conn *conn)
2615 {
2616         struct completion comp;
2617
2618         init_completion(&comp);
2619
2620         wait_for_completion_interruptible(&comp);
2621 }
2622
2623 static struct iscsit_transport iser_target_transport = {
2624         .name                   = "IB/iSER",
2625         .transport_type         = ISCSI_INFINIBAND,
2626         .rdma_shutdown          = true,
2627         .priv_size              = sizeof(struct isert_cmd),
2628         .owner                  = THIS_MODULE,
2629         .iscsit_setup_np        = isert_setup_np,
2630         .iscsit_accept_np       = isert_accept_np,
2631         .iscsit_free_np         = isert_free_np,
2632         .iscsit_wait_conn       = isert_wait_conn,
2633         .iscsit_free_conn       = isert_free_conn,
2634         .iscsit_get_login_rx    = isert_get_login_rx,
2635         .iscsit_put_login_tx    = isert_put_login_tx,
2636         .iscsit_immediate_queue = isert_immediate_queue,
2637         .iscsit_response_queue  = isert_response_queue,
2638         .iscsit_get_dataout     = isert_get_dataout,
2639         .iscsit_queue_data_in   = isert_put_datain,
2640         .iscsit_queue_status    = isert_put_response,
2641         .iscsit_aborted_task    = isert_aborted_task,
2642         .iscsit_get_rx_pdu      = isert_get_rx_pdu,
2643         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2644 };
2645
2646 static int __init isert_init(void)
2647 {
2648         int ret;
2649
2650         isert_comp_wq = alloc_workqueue("isert_comp_wq",
2651                                         WQ_UNBOUND | WQ_HIGHPRI, 0);
2652         if (!isert_comp_wq) {
2653                 isert_err("Unable to allocate isert_comp_wq\n");
2654                 ret = -ENOMEM;
2655                 return -ENOMEM;
2656         }
2657
2658         isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2659                                         WQ_UNBOUND_MAX_ACTIVE);
2660         if (!isert_release_wq) {
2661                 isert_err("Unable to allocate isert_release_wq\n");
2662                 ret = -ENOMEM;
2663                 goto destroy_comp_wq;
2664         }
2665
2666         iscsit_register_transport(&iser_target_transport);
2667         isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2668
2669         return 0;
2670
2671 destroy_comp_wq:
2672         destroy_workqueue(isert_comp_wq);
2673
2674         return ret;
2675 }
2676
2677 static void __exit isert_exit(void)
2678 {
2679         flush_scheduled_work();
2680         destroy_workqueue(isert_release_wq);
2681         destroy_workqueue(isert_comp_wq);
2682         iscsit_unregister_transport(&iser_target_transport);
2683         isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2684 }
2685
2686 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2687 MODULE_VERSION("1.0");
2688 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2689 MODULE_LICENSE("GPL");
2690
2691 module_init(isert_init);
2692 module_exit(isert_exit);