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         ib_drain_qp(isert_conn->qp);
 751         list_del_init(&isert_conn->node);
 752         isert_conn->cm_id = NULL;
 753         isert_put_conn(isert_conn);
 754
 755         return -1;
 756 }
 757
 758 static int
 759 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 760 {
 761         struct isert_np *isert_np = cma_id->context;
 762         struct isert_conn *isert_conn;
 763         int ret = 0;
 764
 765         isert_info("%s (%d): status %d id %p np %p\n",
 766                    rdma_event_msg(event->event), event->event,
 767                    event->status, cma_id, cma_id->context);
 768
 769         if (isert_np->cm_id == cma_id)
 770                 return isert_np_cma_handler(cma_id->context, event->event);
 771
 772         switch (event->event) {
 773         case RDMA_CM_EVENT_CONNECT_REQUEST:
 774                 ret = isert_connect_request(cma_id, event);
 775                 if (ret)
 776                         isert_err("failed handle connect request %d\n", ret);
 777                 break;
 778         case RDMA_CM_EVENT_ESTABLISHED:
 779                 isert_connected_handler(cma_id);
 780                 break;
 781         case RDMA_CM_EVENT_ADDR_CHANGE:    /* FALLTHRU */
 782         case RDMA_CM_EVENT_DISCONNECTED:   /* FALLTHRU */
 783         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
 784                 ret = isert_disconnected_handler(cma_id, event->event);
 785                 break;
 786         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 787                 isert_conn = cma_id->qp->qp_context;
 788                 isert_conn->dev_removed = true;
 789                 isert_disconnected_handler(cma_id, event->event);
 790                 wait_event_interruptible(isert_conn->rem_wait,
 791                                          isert_conn->state == ISER_CONN_DOWN);
 792                 kfree(isert_conn);
 793                 /*
 794                  * return non-zero from the callback to destroy
 795                  * the rdma cm id
 796                  */
 797                 return 1;
 798         case RDMA_CM_EVENT_REJECTED:       /* FALLTHRU */
 799         case RDMA_CM_EVENT_UNREACHABLE:    /* FALLTHRU */
 800         case RDMA_CM_EVENT_CONNECT_ERROR:
 801                 ret = isert_connect_error(cma_id);
 802                 break;
 803         default:
 804                 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
 805                 break;
 806         }
 807
 808         return ret;
 809 }
 810
 811 static int
 812 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
 813 {
 814         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 815         int i, ret;
 816         struct iser_rx_desc *rx_desc;
 817
 818         for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
 819                 rx_desc = &isert_conn->rx_descs[i];
 820
 821                 rx_wr->wr_cqe = &rx_desc->rx_cqe;
 822                 rx_wr->sg_list = &rx_desc->rx_sg;
 823                 rx_wr->num_sge = 1;
 824                 rx_wr->next = rx_wr + 1;
 825         }
 826         rx_wr--;
 827         rx_wr->next = NULL; /* mark end of work requests list */
 828
 829         ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
 830                            &rx_wr_failed);
 831         if (ret)
 832                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 833
 834         return ret;
 835 }
 836
 837 static int
 838 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
 839 {
 840         struct ib_recv_wr *rx_wr_failed, rx_wr;
 841         int ret;
 842
 843         rx_wr.wr_cqe = &rx_desc->rx_cqe;
 844         rx_wr.sg_list = &rx_desc->rx_sg;
 845         rx_wr.num_sge = 1;
 846         rx_wr.next = NULL;
 847
 848         ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
 849         if (ret)
 850                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 851
 852         return ret;
 853 }
 854
 855 static int
 856 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 857 {
 858         struct ib_device *ib_dev = isert_conn->cm_id->device;
 859         struct ib_send_wr send_wr, *send_wr_failed;
 860         int ret;
 861
 862         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 863                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 864
 865         tx_desc->tx_cqe.done = isert_login_send_done;
 866
 867         send_wr.next    = NULL;
 868         send_wr.wr_cqe  = &tx_desc->tx_cqe;
 869         send_wr.sg_list = tx_desc->tx_sg;
 870         send_wr.num_sge = tx_desc->num_sge;
 871         send_wr.opcode  = IB_WR_SEND;
 872         send_wr.send_flags = IB_SEND_SIGNALED;
 873
 874         ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
 875         if (ret)
 876                 isert_err("ib_post_send() failed, ret: %d\n", ret);
 877
 878         return ret;
 879 }
 880
 881 static void
 882 __isert_create_send_desc(struct isert_device *device,
 883                          struct iser_tx_desc *tx_desc)
 884 {
 885
 886         memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
 887         tx_desc->iser_header.flags = ISCSI_CTRL;
 888
 889         tx_desc->num_sge = 1;
 890
 891         if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
 892                 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
 893                 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 894         }
 895 }
 896
 897 static void
 898 isert_create_send_desc(struct isert_conn *isert_conn,
 899                        struct isert_cmd *isert_cmd,
 900                        struct iser_tx_desc *tx_desc)
 901 {
 902         struct isert_device *device = isert_conn->device;
 903         struct ib_device *ib_dev = device->ib_device;
 904
 905         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 906                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 907
 908         __isert_create_send_desc(device, tx_desc);
 909 }
 910
 911 static int
 912 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 913                    struct iser_tx_desc *tx_desc)
 914 {
 915         struct isert_device *device = isert_conn->device;
 916         struct ib_device *ib_dev = device->ib_device;
 917         u64 dma_addr;
 918
 919         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 920                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 921         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 922                 isert_err("ib_dma_mapping_error() failed\n");
 923                 return -ENOMEM;
 924         }
 925
 926         tx_desc->dma_addr = dma_addr;
 927         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 928         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 929         tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
 930
 931         isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
 932                   tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
 933                   tx_desc->tx_sg[0].lkey);
 934
 935         return 0;
 936 }
 937
 938 static void
 939 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 940                    struct ib_send_wr *send_wr)
 941 {
 942         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 943
 944         tx_desc->tx_cqe.done = isert_send_done;
 945         send_wr->wr_cqe = &tx_desc->tx_cqe;
 946
 947         if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
 948                 send_wr->opcode  = IB_WR_SEND_WITH_INV;
 949                 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
 950         } else {
 951                 send_wr->opcode = IB_WR_SEND;
 952         }
 953
 954         send_wr->sg_list = &tx_desc->tx_sg[0];
 955         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 956         send_wr->send_flags = IB_SEND_SIGNALED;
 957 }
 958
 959 static int
 960 isert_login_post_recv(struct isert_conn *isert_conn)
 961 {
 962         struct ib_recv_wr rx_wr, *rx_wr_fail;
 963         struct ib_sge sge;
 964         int ret;
 965
 966         memset(&sge, 0, sizeof(struct ib_sge));
 967         sge.addr = isert_conn->login_req_dma;
 968         sge.length = ISER_RX_PAYLOAD_SIZE;
 969         sge.lkey = isert_conn->device->pd->local_dma_lkey;
 970
 971         isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
 972                 sge.addr, sge.length, sge.lkey);
 973
 974         isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
 975
 976         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
 977         rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
 978         rx_wr.sg_list = &sge;
 979         rx_wr.num_sge = 1;
 980
 981         ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
 982         if (ret)
 983                 isert_err("ib_post_recv() failed: %d\n", ret);
 984
 985         return ret;
 986 }
 987
 988 static int
 989 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
 990                    u32 length)
 991 {
 992         struct isert_conn *isert_conn = conn->context;
 993         struct isert_device *device = isert_conn->device;
 994         struct ib_device *ib_dev = device->ib_device;
 995         struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
 996         int ret;
 997
 998         __isert_create_send_desc(device, tx_desc);
 999
1000         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1001                sizeof(struct iscsi_hdr));
1002
1003         isert_init_tx_hdrs(isert_conn, tx_desc);
1004
1005         if (length > 0) {
1006                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1007
1008                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1009                                            length, DMA_TO_DEVICE);
1010
1011                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1012
1013                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1014                                               length, DMA_TO_DEVICE);
1015
1016                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1017                 tx_dsg->length  = length;
1018                 tx_dsg->lkey    = isert_conn->device->pd->local_dma_lkey;
1019                 tx_desc->num_sge = 2;
1020         }
1021         if (!login->login_failed) {
1022                 if (login->login_complete) {
1023                         ret = isert_alloc_rx_descriptors(isert_conn);
1024                         if (ret)
1025                                 return ret;
1026
1027                         ret = isert_post_recvm(isert_conn,
1028                                                ISERT_QP_MAX_RECV_DTOS);
1029                         if (ret)
1030                                 return ret;
1031
1032                         /* Now we are in FULL_FEATURE phase */
1033                         mutex_lock(&isert_conn->mutex);
1034                         isert_conn->state = ISER_CONN_FULL_FEATURE;
1035                         mutex_unlock(&isert_conn->mutex);
1036                         goto post_send;
1037                 }
1038
1039                 ret = isert_login_post_recv(isert_conn);
1040                 if (ret)
1041                         return ret;
1042         }
1043 post_send:
1044         ret = isert_login_post_send(isert_conn, tx_desc);
1045         if (ret)
1046                 return ret;
1047
1048         return 0;
1049 }
1050
1051 static void
1052 isert_rx_login_req(struct isert_conn *isert_conn)
1053 {
1054         struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1055         int rx_buflen = isert_conn->login_req_len;
1056         struct iscsi_conn *conn = isert_conn->conn;
1057         struct iscsi_login *login = conn->conn_login;
1058         int size;
1059
1060         isert_info("conn %p\n", isert_conn);
1061
1062         WARN_ON_ONCE(!login);
1063
1064         if (login->first_request) {
1065                 struct iscsi_login_req *login_req =
1066                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1067                 /*
1068                  * Setup the initial iscsi_login values from the leading
1069                  * login request PDU.
1070                  */
1071                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1072                 login->current_stage =
1073                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1074                          >> 2;
1075                 login->version_min      = login_req->min_version;
1076                 login->version_max      = login_req->max_version;
1077                 memcpy(login->isid, login_req->isid, 6);
1078                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1079                 login->init_task_tag    = login_req->itt;
1080                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1081                 login->cid              = be16_to_cpu(login_req->cid);
1082                 login->tsih             = be16_to_cpu(login_req->tsih);
1083         }
1084
1085         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1086
1087         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1088         isert_dbg("Using login payload size: %d, rx_buflen: %d "
1089                   "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1090                   MAX_KEY_VALUE_PAIRS);
1091         memcpy(login->req_buf, &rx_desc->data[0], size);
1092
1093         if (login->first_request) {
1094                 complete(&isert_conn->login_comp);
1095                 return;
1096         }
1097         schedule_delayed_work(&conn->login_work, 0);
1098 }
1099
1100 static struct iscsi_cmd
1101 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1102 {
1103         struct isert_conn *isert_conn = conn->context;
1104         struct isert_cmd *isert_cmd;
1105         struct iscsi_cmd *cmd;
1106
1107         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1108         if (!cmd) {
1109                 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1110                 return NULL;
1111         }
1112         isert_cmd = iscsit_priv_cmd(cmd);
1113         isert_cmd->conn = isert_conn;
1114         isert_cmd->iscsi_cmd = cmd;
1115         isert_cmd->rx_desc = rx_desc;
1116
1117         return cmd;
1118 }
1119
1120 static int
1121 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1122                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1123                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1124 {
1125         struct iscsi_conn *conn = isert_conn->conn;
1126         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1127         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1128         bool dump_payload = false;
1129         unsigned int data_len;
1130
1131         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1132         if (rc < 0)
1133                 return rc;
1134
1135         imm_data = cmd->immediate_data;
1136         imm_data_len = cmd->first_burst_len;
1137         unsol_data = cmd->unsolicited_data;
1138         data_len = cmd->se_cmd.data_length;
1139
1140         if (imm_data && imm_data_len == data_len)
1141                 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1142         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1143         if (rc < 0) {
1144                 return 0;
1145         } else if (rc > 0) {
1146                 dump_payload = true;
1147                 goto sequence_cmd;
1148         }
1149
1150         if (!imm_data)
1151                 return 0;
1152
1153         if (imm_data_len != data_len) {
1154                 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1155                 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1156                                     &rx_desc->data[0], imm_data_len);
1157                 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1158                           sg_nents, imm_data_len);
1159         } else {
1160                 sg_init_table(&isert_cmd->sg, 1);
1161                 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1162                 cmd->se_cmd.t_data_nents = 1;
1163                 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1164                 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1165                           imm_data_len);
1166         }
1167
1168         cmd->write_data_done += imm_data_len;
1169
1170         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1171                 spin_lock_bh(&cmd->istate_lock);
1172                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1173                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1174                 spin_unlock_bh(&cmd->istate_lock);
1175         }
1176
1177 sequence_cmd:
1178         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1179
1180         if (!rc && dump_payload == false && unsol_data)
1181                 iscsit_set_unsoliticed_dataout(cmd);
1182         else if (dump_payload && imm_data)
1183                 target_put_sess_cmd(&cmd->se_cmd);
1184
1185         return 0;
1186 }
1187
1188 static int
1189 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1190                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1191 {
1192         struct scatterlist *sg_start;
1193         struct iscsi_conn *conn = isert_conn->conn;
1194         struct iscsi_cmd *cmd = NULL;
1195         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1196         u32 unsol_data_len = ntoh24(hdr->dlength);
1197         int rc, sg_nents, sg_off, page_off;
1198
1199         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1200         if (rc < 0)
1201                 return rc;
1202         else if (!cmd)
1203                 return 0;
1204         /*
1205          * FIXME: Unexpected unsolicited_data out
1206          */
1207         if (!cmd->unsolicited_data) {
1208                 isert_err("Received unexpected solicited data payload\n");
1209                 dump_stack();
1210                 return -1;
1211         }
1212
1213         isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1214                   "write_data_done: %u, data_length: %u\n",
1215                   unsol_data_len,  cmd->write_data_done,
1216                   cmd->se_cmd.data_length);
1217
1218         sg_off = cmd->write_data_done / PAGE_SIZE;
1219         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1220         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1221         page_off = cmd->write_data_done % PAGE_SIZE;
1222         /*
1223          * FIXME: Non page-aligned unsolicited_data out
1224          */
1225         if (page_off) {
1226                 isert_err("unexpected non-page aligned data payload\n");
1227                 dump_stack();
1228                 return -1;
1229         }
1230         isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1231                   "sg_nents: %u from %p %u\n", sg_start, sg_off,
1232                   sg_nents, &rx_desc->data[0], unsol_data_len);
1233
1234         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1235                             unsol_data_len);
1236
1237         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1238         if (rc < 0)
1239                 return rc;
1240
1241         /*
1242          * multiple data-outs on the same command can arrive -
1243          * so post the buffer before hand
1244          */
1245         rc = isert_post_recv(isert_conn, rx_desc);
1246         if (rc) {
1247                 isert_err("ib_post_recv failed with %d\n", rc);
1248                 return rc;
1249         }
1250         return 0;
1251 }
1252
1253 static int
1254 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1255                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1256                      unsigned char *buf)
1257 {
1258         struct iscsi_conn *conn = isert_conn->conn;
1259         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1260         int rc;
1261
1262         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1263         if (rc < 0)
1264                 return rc;
1265         /*
1266          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1267          */
1268
1269         return iscsit_process_nop_out(conn, cmd, hdr);
1270 }
1271
1272 static int
1273 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1274                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1275                       struct iscsi_text *hdr)
1276 {
1277         struct iscsi_conn *conn = isert_conn->conn;
1278         u32 payload_length = ntoh24(hdr->dlength);
1279         int rc;
1280         unsigned char *text_in = NULL;
1281
1282         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1283         if (rc < 0)
1284                 return rc;
1285
1286         if (payload_length) {
1287                 text_in = kzalloc(payload_length, GFP_KERNEL);
1288                 if (!text_in) {
1289                         isert_err("Unable to allocate text_in of payload_length: %u\n",
1290                                   payload_length);
1291                         return -ENOMEM;
1292                 }
1293         }
1294         cmd->text_in_ptr = text_in;
1295
1296         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1297
1298         return iscsit_process_text_cmd(conn, cmd, hdr);
1299 }
1300
1301 static int
1302 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1303                 uint32_t read_stag, uint64_t read_va,
1304                 uint32_t write_stag, uint64_t write_va)
1305 {
1306         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1307         struct iscsi_conn *conn = isert_conn->conn;
1308         struct iscsi_cmd *cmd;
1309         struct isert_cmd *isert_cmd;
1310         int ret = -EINVAL;
1311         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1312
1313         if (conn->sess->sess_ops->SessionType &&
1314            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1315                 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1316                           " ignoring\n", opcode);
1317                 return 0;
1318         }
1319
1320         switch (opcode) {
1321         case ISCSI_OP_SCSI_CMD:
1322                 cmd = isert_allocate_cmd(conn, rx_desc);
1323                 if (!cmd)
1324                         break;
1325
1326                 isert_cmd = iscsit_priv_cmd(cmd);
1327                 isert_cmd->read_stag = read_stag;
1328                 isert_cmd->read_va = read_va;
1329                 isert_cmd->write_stag = write_stag;
1330                 isert_cmd->write_va = write_va;
1331                 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1332
1333                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1334                                         rx_desc, (unsigned char *)hdr);
1335                 break;
1336         case ISCSI_OP_NOOP_OUT:
1337                 cmd = isert_allocate_cmd(conn, rx_desc);
1338                 if (!cmd)
1339                         break;
1340
1341                 isert_cmd = iscsit_priv_cmd(cmd);
1342                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1343                                            rx_desc, (unsigned char *)hdr);
1344                 break;
1345         case ISCSI_OP_SCSI_DATA_OUT:
1346                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1347                                                 (unsigned char *)hdr);
1348                 break;
1349         case ISCSI_OP_SCSI_TMFUNC:
1350                 cmd = isert_allocate_cmd(conn, rx_desc);
1351                 if (!cmd)
1352                         break;
1353
1354                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1355                                                 (unsigned char *)hdr);
1356                 break;
1357         case ISCSI_OP_LOGOUT:
1358                 cmd = isert_allocate_cmd(conn, rx_desc);
1359                 if (!cmd)
1360                         break;
1361
1362                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1363                 break;
1364         case ISCSI_OP_TEXT:
1365                 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1366                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1367                 else
1368                         cmd = isert_allocate_cmd(conn, rx_desc);
1369
1370                 if (!cmd)
1371                         break;
1372
1373                 isert_cmd = iscsit_priv_cmd(cmd);
1374                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1375                                             rx_desc, (struct iscsi_text *)hdr);
1376                 break;
1377         default:
1378                 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1379                 dump_stack();
1380                 break;
1381         }
1382
1383         return ret;
1384 }
1385
1386 static void
1387 isert_print_wc(struct ib_wc *wc, const char *type)
1388 {
1389         if (wc->status != IB_WC_WR_FLUSH_ERR)
1390                 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1391                           ib_wc_status_msg(wc->status), wc->status,
1392                           wc->vendor_err);
1393         else
1394                 isert_dbg("%s failure: %s (%d)\n", type,
1395                           ib_wc_status_msg(wc->status), wc->status);
1396 }
1397
1398 static void
1399 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1400 {
1401         struct isert_conn *isert_conn = wc->qp->qp_context;
1402         struct ib_device *ib_dev = isert_conn->cm_id->device;
1403         struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1404         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1405         struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1406         uint64_t read_va = 0, write_va = 0;
1407         uint32_t read_stag = 0, write_stag = 0;
1408
1409         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1410                 isert_print_wc(wc, "recv");
1411                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1412                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1413                 return;
1414         }
1415
1416         ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1417                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1418
1419         isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1420                  rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1421                  (int)(wc->byte_len - ISER_HEADERS_LEN));
1422
1423         switch (iser_ctrl->flags & 0xF0) {
1424         case ISCSI_CTRL:
1425                 if (iser_ctrl->flags & ISER_RSV) {
1426                         read_stag = be32_to_cpu(iser_ctrl->read_stag);
1427                         read_va = be64_to_cpu(iser_ctrl->read_va);
1428                         isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1429                                   read_stag, (unsigned long long)read_va);
1430                 }
1431                 if (iser_ctrl->flags & ISER_WSV) {
1432                         write_stag = be32_to_cpu(iser_ctrl->write_stag);
1433                         write_va = be64_to_cpu(iser_ctrl->write_va);
1434                         isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1435                                   write_stag, (unsigned long long)write_va);
1436                 }
1437
1438                 isert_dbg("ISER ISCSI_CTRL PDU\n");
1439                 break;
1440         case ISER_HELLO:
1441                 isert_err("iSER Hello message\n");
1442                 break;
1443         default:
1444                 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1445                 break;
1446         }
1447
1448         isert_rx_opcode(isert_conn, rx_desc,
1449                         read_stag, read_va, write_stag, write_va);
1450
1451         ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1452                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1453 }
1454
1455 static void
1456 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1457 {
1458         struct isert_conn *isert_conn = wc->qp->qp_context;
1459         struct ib_device *ib_dev = isert_conn->device->ib_device;
1460
1461         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1462                 isert_print_wc(wc, "login recv");
1463                 return;
1464         }
1465
1466         ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1467                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1468
1469         isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1470
1471         if (isert_conn->conn) {
1472                 struct iscsi_login *login = isert_conn->conn->conn_login;
1473
1474                 if (login && !login->first_request)
1475                         isert_rx_login_req(isert_conn);
1476         }
1477
1478         mutex_lock(&isert_conn->mutex);
1479         complete(&isert_conn->login_req_comp);
1480         mutex_unlock(&isert_conn->mutex);
1481
1482         ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1483                                 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1484 }
1485
1486 static void
1487 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1488 {
1489         struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
1490         enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1491
1492         if (!cmd->rw.nr_ops)
1493                 return;
1494
1495         if (isert_prot_cmd(conn, se_cmd)) {
1496                 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1497                                 conn->cm_id->port_num, se_cmd->t_data_sg,
1498                                 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1499                                 se_cmd->t_prot_nents, dir);
1500         } else {
1501                 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1502                                 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1503         }
1504
1505         cmd->rw.nr_ops = 0;
1506 }
1507
1508 static void
1509 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1510 {
1511         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1512         struct isert_conn *isert_conn = isert_cmd->conn;
1513         struct iscsi_conn *conn = isert_conn->conn;
1514         struct iscsi_text_rsp *hdr;
1515
1516         isert_dbg("Cmd %p\n", isert_cmd);
1517
1518         switch (cmd->iscsi_opcode) {
1519         case ISCSI_OP_SCSI_CMD:
1520                 spin_lock_bh(&conn->cmd_lock);
1521                 if (!list_empty(&cmd->i_conn_node))
1522                         list_del_init(&cmd->i_conn_node);
1523                 spin_unlock_bh(&conn->cmd_lock);
1524
1525                 if (cmd->data_direction == DMA_TO_DEVICE) {
1526                         iscsit_stop_dataout_timer(cmd);
1527                         /*
1528                          * Check for special case during comp_err where
1529                          * WRITE_PENDING has been handed off from core,
1530                          * but requires an extra target_put_sess_cmd()
1531                          * before transport_generic_free_cmd() below.
1532                          */
1533                         if (comp_err &&
1534                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1535                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1536
1537                                 target_put_sess_cmd(se_cmd);
1538                         }
1539                 }
1540
1541                 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1542                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1543                 break;
1544         case ISCSI_OP_SCSI_TMFUNC:
1545                 spin_lock_bh(&conn->cmd_lock);
1546                 if (!list_empty(&cmd->i_conn_node))
1547                         list_del_init(&cmd->i_conn_node);
1548                 spin_unlock_bh(&conn->cmd_lock);
1549
1550                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1551                 break;
1552         case ISCSI_OP_REJECT:
1553         case ISCSI_OP_NOOP_OUT:
1554         case ISCSI_OP_TEXT:
1555                 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1556                 /* If the continue bit is on, keep the command alive */
1557                 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1558                         break;
1559
1560                 spin_lock_bh(&conn->cmd_lock);
1561                 if (!list_empty(&cmd->i_conn_node))
1562                         list_del_init(&cmd->i_conn_node);
1563                 spin_unlock_bh(&conn->cmd_lock);
1564
1565                 /*
1566                  * Handle special case for REJECT when iscsi_add_reject*() has
1567                  * overwritten the original iscsi_opcode assignment, and the
1568                  * associated cmd->se_cmd needs to be released.
1569                  */
1570                 if (cmd->se_cmd.se_tfo != NULL) {
1571                         isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1572                                  cmd->iscsi_opcode);
1573                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1574                         break;
1575                 }
1576                 /*
1577                  * Fall-through
1578                  */
1579         default:
1580                 iscsit_release_cmd(cmd);
1581                 break;
1582         }
1583 }
1584
1585 static void
1586 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1587 {
1588         if (tx_desc->dma_addr != 0) {
1589                 isert_dbg("unmap single for tx_desc->dma_addr\n");
1590                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1591                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1592                 tx_desc->dma_addr = 0;
1593         }
1594 }
1595
1596 static void
1597 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1598                      struct ib_device *ib_dev, bool comp_err)
1599 {
1600         if (isert_cmd->pdu_buf_dma != 0) {
1601                 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1602                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1603                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1604                 isert_cmd->pdu_buf_dma = 0;
1605         }
1606
1607         isert_unmap_tx_desc(tx_desc, ib_dev);
1608         isert_put_cmd(isert_cmd, comp_err);
1609 }
1610
1611 static int
1612 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1613 {
1614         struct ib_mr_status mr_status;
1615         int ret;
1616
1617         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1618         if (ret) {
1619                 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1620                 goto fail_mr_status;
1621         }
1622
1623         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1624                 u64 sec_offset_err;
1625                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1626
1627                 switch (mr_status.sig_err.err_type) {
1628                 case IB_SIG_BAD_GUARD:
1629                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1630                         break;
1631                 case IB_SIG_BAD_REFTAG:
1632                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1633                         break;
1634                 case IB_SIG_BAD_APPTAG:
1635                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1636                         break;
1637                 }
1638                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1639                 do_div(sec_offset_err, block_size);
1640                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1641
1642                 isert_err("PI error found type %d at sector 0x%llx "
1643                           "expected 0x%x vs actual 0x%x\n",
1644                           mr_status.sig_err.err_type,
1645                           (unsigned long long)se_cmd->bad_sector,
1646                           mr_status.sig_err.expected,
1647                           mr_status.sig_err.actual);
1648                 ret = 1;
1649         }
1650
1651 fail_mr_status:
1652         return ret;
1653 }
1654
1655 static void
1656 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1657 {
1658         struct isert_conn *isert_conn = wc->qp->qp_context;
1659         struct isert_device *device = isert_conn->device;
1660         struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1661         struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1662         struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1663         int ret = 0;
1664
1665         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1666                 isert_print_wc(wc, "rdma write");
1667                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1668                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1669                 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1670                 return;
1671         }
1672
1673         isert_dbg("Cmd %p\n", isert_cmd);
1674
1675         ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr);
1676         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1677
1678         if (ret)
1679                 transport_send_check_condition_and_sense(cmd, cmd->pi_err, 0);
1680         else
1681                 isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1682 }
1683
1684 static void
1685 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1686 {
1687         struct isert_conn *isert_conn = wc->qp->qp_context;
1688         struct isert_device *device = isert_conn->device;
1689         struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1690         struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1691         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1692         struct se_cmd *se_cmd = &cmd->se_cmd;
1693         int ret = 0;
1694
1695         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1696                 isert_print_wc(wc, "rdma read");
1697                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1698                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1699                 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1700                 return;
1701         }
1702
1703         isert_dbg("Cmd %p\n", isert_cmd);
1704
1705         iscsit_stop_dataout_timer(cmd);
1706
1707         if (isert_prot_cmd(isert_conn, se_cmd))
1708                 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr);
1709         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1710         cmd->write_data_done = 0;
1711
1712         isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1713         spin_lock_bh(&cmd->istate_lock);
1714         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1715         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1716         spin_unlock_bh(&cmd->istate_lock);
1717
1718         if (ret) {
1719                 target_put_sess_cmd(se_cmd);
1720                 transport_send_check_condition_and_sense(se_cmd,
1721                                                          se_cmd->pi_err, 0);
1722         } else {
1723                 target_execute_cmd(se_cmd);
1724         }
1725 }
1726
1727 static void
1728 isert_do_control_comp(struct work_struct *work)
1729 {
1730         struct isert_cmd *isert_cmd = container_of(work,
1731                         struct isert_cmd, comp_work);
1732         struct isert_conn *isert_conn = isert_cmd->conn;
1733         struct ib_device *ib_dev = isert_conn->cm_id->device;
1734         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1735
1736         isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1737
1738         switch (cmd->i_state) {
1739         case ISTATE_SEND_TASKMGTRSP:
1740                 iscsit_tmr_post_handler(cmd, cmd->conn);
1741         case ISTATE_SEND_REJECT:   /* FALLTHRU */
1742         case ISTATE_SEND_TEXTRSP:  /* FALLTHRU */
1743                 cmd->i_state = ISTATE_SENT_STATUS;
1744                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1745                                      ib_dev, false);
1746                 break;
1747         case ISTATE_SEND_LOGOUTRSP:
1748                 iscsit_logout_post_handler(cmd, cmd->conn);
1749                 break;
1750         default:
1751                 isert_err("Unknown i_state %d\n", cmd->i_state);
1752                 dump_stack();
1753                 break;
1754         }
1755 }
1756
1757 static void
1758 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1759 {
1760         struct isert_conn *isert_conn = wc->qp->qp_context;
1761         struct ib_device *ib_dev = isert_conn->cm_id->device;
1762         struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1763
1764         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1765                 isert_print_wc(wc, "login send");
1766                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1767                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1768         }
1769
1770         isert_unmap_tx_desc(tx_desc, ib_dev);
1771 }
1772
1773 static void
1774 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1775 {
1776         struct isert_conn *isert_conn = wc->qp->qp_context;
1777         struct ib_device *ib_dev = isert_conn->cm_id->device;
1778         struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1779         struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1780
1781         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1782                 isert_print_wc(wc, "send");
1783                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1784                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1785                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1786                 return;
1787         }
1788
1789         isert_dbg("Cmd %p\n", isert_cmd);
1790
1791         switch (isert_cmd->iscsi_cmd->i_state) {
1792         case ISTATE_SEND_TASKMGTRSP:
1793         case ISTATE_SEND_LOGOUTRSP:
1794         case ISTATE_SEND_REJECT:
1795         case ISTATE_SEND_TEXTRSP:
1796                 isert_unmap_tx_desc(tx_desc, ib_dev);
1797
1798                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1799                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1800                 return;
1801         default:
1802                 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
1803                 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1804                 break;
1805         }
1806 }
1807
1808 static int
1809 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1810 {
1811         struct ib_send_wr *wr_failed;
1812         int ret;
1813
1814         ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1815         if (ret) {
1816                 isert_err("ib_post_recv failed with %d\n", ret);
1817                 return ret;
1818         }
1819
1820         ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
1821                            &wr_failed);
1822         if (ret) {
1823                 isert_err("ib_post_send failed with %d\n", ret);
1824                 return ret;
1825         }
1826         return ret;
1827 }
1828
1829 static int
1830 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1831 {
1832         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1833         struct isert_conn *isert_conn = conn->context;
1834         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1835         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1836                                 &isert_cmd->tx_desc.iscsi_header;
1837
1838         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1839         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1840         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1841         /*
1842          * Attach SENSE DATA payload to iSCSI Response PDU
1843          */
1844         if (cmd->se_cmd.sense_buffer &&
1845             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1846             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1847                 struct isert_device *device = isert_conn->device;
1848                 struct ib_device *ib_dev = device->ib_device;
1849                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1850                 u32 padding, pdu_len;
1851
1852                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1853                                    cmd->sense_buffer);
1854                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1855
1856                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1857                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1858                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1859
1860                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1861                                 (void *)cmd->sense_buffer, pdu_len,
1862                                 DMA_TO_DEVICE);
1863
1864                 isert_cmd->pdu_buf_len = pdu_len;
1865                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1866                 tx_dsg->length  = pdu_len;
1867                 tx_dsg->lkey    = device->pd->local_dma_lkey;
1868                 isert_cmd->tx_desc.num_sge = 2;
1869         }
1870
1871         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1872
1873         isert_dbg("Posting SCSI Response\n");
1874
1875         return isert_post_response(isert_conn, isert_cmd);
1876 }
1877
1878 static void
1879 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1880 {
1881         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1882         struct isert_conn *isert_conn = conn->context;
1883
1884         spin_lock_bh(&conn->cmd_lock);
1885         if (!list_empty(&cmd->i_conn_node))
1886                 list_del_init(&cmd->i_conn_node);
1887         spin_unlock_bh(&conn->cmd_lock);
1888
1889         if (cmd->data_direction == DMA_TO_DEVICE)
1890                 iscsit_stop_dataout_timer(cmd);
1891         isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1892 }
1893
1894 static enum target_prot_op
1895 isert_get_sup_prot_ops(struct iscsi_conn *conn)
1896 {
1897         struct isert_conn *isert_conn = conn->context;
1898         struct isert_device *device = isert_conn->device;
1899
1900         if (conn->tpg->tpg_attrib.t10_pi) {
1901                 if (device->pi_capable) {
1902                         isert_info("conn %p PI offload enabled\n", isert_conn);
1903                         isert_conn->pi_support = true;
1904                         return TARGET_PROT_ALL;
1905                 }
1906         }
1907
1908         isert_info("conn %p PI offload disabled\n", isert_conn);
1909         isert_conn->pi_support = false;
1910
1911         return TARGET_PROT_NORMAL;
1912 }
1913
1914 static int
1915 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1916                 bool nopout_response)
1917 {
1918         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1919         struct isert_conn *isert_conn = conn->context;
1920         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1921
1922         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1923         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1924                                &isert_cmd->tx_desc.iscsi_header,
1925                                nopout_response);
1926         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1927         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1928
1929         isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1930
1931         return isert_post_response(isert_conn, isert_cmd);
1932 }
1933
1934 static int
1935 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1936 {
1937         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1938         struct isert_conn *isert_conn = conn->context;
1939         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1940
1941         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1942         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1943                                 &isert_cmd->tx_desc.iscsi_header);
1944         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1945         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1946
1947         isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1948
1949         return isert_post_response(isert_conn, isert_cmd);
1950 }
1951
1952 static int
1953 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1954 {
1955         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1956         struct isert_conn *isert_conn = conn->context;
1957         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1958
1959         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1960         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1961                                   &isert_cmd->tx_desc.iscsi_header);
1962         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1963         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1964
1965         isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1966
1967         return isert_post_response(isert_conn, isert_cmd);
1968 }
1969
1970 static int
1971 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1972 {
1973         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1974         struct isert_conn *isert_conn = conn->context;
1975         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1976         struct isert_device *device = isert_conn->device;
1977         struct ib_device *ib_dev = device->ib_device;
1978         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1979         struct iscsi_reject *hdr =
1980                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1981
1982         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1983         iscsit_build_reject(cmd, conn, hdr);
1984         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1985
1986         hton24(hdr->dlength, ISCSI_HDR_LEN);
1987         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1988                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1989                         DMA_TO_DEVICE);
1990         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1991         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1992         tx_dsg->length  = ISCSI_HDR_LEN;
1993         tx_dsg->lkey    = device->pd->local_dma_lkey;
1994         isert_cmd->tx_desc.num_sge = 2;
1995
1996         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1997
1998         isert_dbg("conn %p Posting Reject\n", isert_conn);
1999
2000         return isert_post_response(isert_conn, isert_cmd);
2001 }
2002
2003 static int
2004 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2005 {
2006         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2007         struct isert_conn *isert_conn = conn->context;
2008         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2009         struct iscsi_text_rsp *hdr =
2010                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2011         u32 txt_rsp_len;
2012         int rc;
2013
2014         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2015         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2016         if (rc < 0)
2017                 return rc;
2018
2019         txt_rsp_len = rc;
2020         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2021
2022         if (txt_rsp_len) {
2023                 struct isert_device *device = isert_conn->device;
2024                 struct ib_device *ib_dev = device->ib_device;
2025                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2026                 void *txt_rsp_buf = cmd->buf_ptr;
2027
2028                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2029                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2030
2031                 isert_cmd->pdu_buf_len = txt_rsp_len;
2032                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2033                 tx_dsg->length  = txt_rsp_len;
2034                 tx_dsg->lkey    = device->pd->local_dma_lkey;
2035                 isert_cmd->tx_desc.num_sge = 2;
2036         }
2037         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2038
2039         isert_dbg("conn %p Text Response\n", isert_conn);
2040
2041         return isert_post_response(isert_conn, isert_cmd);
2042 }
2043
2044 static inline void
2045 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2046                      struct ib_sig_domain *domain)
2047 {
2048         domain->sig_type = IB_SIG_TYPE_T10_DIF;
2049         domain->sig.dif.bg_type = IB_T10DIF_CRC;
2050         domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2051         domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2052         /*
2053          * At the moment we hard code those, but if in the future
2054          * the target core would like to use it, we will take it
2055          * from se_cmd.
2056          */
2057         domain->sig.dif.apptag_check_mask = 0xffff;
2058         domain->sig.dif.app_escape = true;
2059         domain->sig.dif.ref_escape = true;
2060         if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2061             se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2062                 domain->sig.dif.ref_remap = true;
2063 };
2064
2065 static int
2066 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2067 {
2068         memset(sig_attrs, 0, sizeof(*sig_attrs));
2069
2070         switch (se_cmd->prot_op) {
2071         case TARGET_PROT_DIN_INSERT:
2072         case TARGET_PROT_DOUT_STRIP:
2073                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2074                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2075                 break;
2076         case TARGET_PROT_DOUT_INSERT:
2077         case TARGET_PROT_DIN_STRIP:
2078                 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2079                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2080                 break;
2081         case TARGET_PROT_DIN_PASS:
2082         case TARGET_PROT_DOUT_PASS:
2083                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2084                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2085                 break;
2086         default:
2087                 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2088                 return -EINVAL;
2089         }
2090
2091         sig_attrs->check_mask =
2092                (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2093                (se_cmd->prot_checks & TARGET_DIF_CHECK_APPTAG ? 0x30 : 0) |
2094                (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2095         return 0;
2096 }
2097
2098 static int
2099 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2100                 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2101 {
2102         struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
2103         enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2104         u8 port_num = conn->cm_id->port_num;
2105         u64 addr;
2106         u32 rkey, offset;
2107         int ret;
2108
2109         if (cmd->ctx_init_done)
2110                 goto rdma_ctx_post;
2111
2112         if (dir == DMA_FROM_DEVICE) {
2113                 addr = cmd->write_va;
2114                 rkey = cmd->write_stag;
2115                 offset = cmd->iscsi_cmd->write_data_done;
2116         } else {
2117                 addr = cmd->read_va;
2118                 rkey = cmd->read_stag;
2119                 offset = 0;
2120         }
2121
2122         if (isert_prot_cmd(conn, se_cmd)) {
2123                 struct ib_sig_attrs sig_attrs;
2124
2125                 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2126                 if (ret)
2127                         return ret;
2128
2129                 WARN_ON_ONCE(offset);
2130                 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2131                                 se_cmd->t_data_sg, se_cmd->t_data_nents,
2132                                 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2133                                 &sig_attrs, addr, rkey, dir);
2134         } else {
2135                 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2136                                 se_cmd->t_data_sg, se_cmd->t_data_nents,
2137                                 offset, addr, rkey, dir);
2138         }
2139
2140         if (ret < 0) {
2141                 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2142                 return ret;
2143         }
2144
2145         cmd->ctx_init_done = true;
2146
2147 rdma_ctx_post:
2148         ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2149         if (ret < 0)
2150                 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2151         return ret;
2152 }
2153
2154 static int
2155 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2156 {
2157         struct se_cmd *se_cmd = &cmd->se_cmd;
2158         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2159         struct isert_conn *isert_conn = conn->context;
2160         struct ib_cqe *cqe = NULL;
2161         struct ib_send_wr *chain_wr = NULL;
2162         int rc;
2163
2164         isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2165                  isert_cmd, se_cmd->data_length);
2166
2167         if (isert_prot_cmd(isert_conn, se_cmd)) {
2168                 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2169                 cqe = &isert_cmd->tx_desc.tx_cqe;
2170         } else {
2171                 /*
2172                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2173                  */
2174                 isert_create_send_desc(isert_conn, isert_cmd,
2175                                        &isert_cmd->tx_desc);
2176                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2177                                      &isert_cmd->tx_desc.iscsi_header);
2178                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2179                 isert_init_send_wr(isert_conn, isert_cmd,
2180                                    &isert_cmd->tx_desc.send_wr);
2181
2182                 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2183                 if (rc) {
2184                         isert_err("ib_post_recv failed with %d\n", rc);
2185                         return rc;
2186                 }
2187
2188                 chain_wr = &isert_cmd->tx_desc.send_wr;
2189         }
2190
2191         isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2192         isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n", isert_cmd);
2193         return 1;
2194 }
2195
2196 static int
2197 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2198 {
2199         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2200
2201         isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2202                  isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2203
2204         isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2205         isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2206                         &isert_cmd->tx_desc.tx_cqe, NULL);
2207
2208         isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2209                  isert_cmd);
2210         return 0;
2211 }
2212
2213 static int
2214 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2215 {
2216         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2217         int ret = 0;
2218
2219         switch (state) {
2220         case ISTATE_REMOVE:
2221                 spin_lock_bh(&conn->cmd_lock);
2222                 list_del_init(&cmd->i_conn_node);
2223                 spin_unlock_bh(&conn->cmd_lock);
2224                 isert_put_cmd(isert_cmd, true);
2225                 break;
2226         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2227                 ret = isert_put_nopin(cmd, conn, false);
2228                 break;
2229         default:
2230                 isert_err("Unknown immediate state: 0x%02x\n", state);
2231                 ret = -EINVAL;
2232                 break;
2233         }
2234
2235         return ret;
2236 }
2237
2238 static int
2239 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2240 {
2241         struct isert_conn *isert_conn = conn->context;
2242         int ret;
2243
2244         switch (state) {
2245         case ISTATE_SEND_LOGOUTRSP:
2246                 ret = isert_put_logout_rsp(cmd, conn);
2247                 if (!ret)
2248                         isert_conn->logout_posted = true;
2249                 break;
2250         case ISTATE_SEND_NOPIN:
2251                 ret = isert_put_nopin(cmd, conn, true);
2252                 break;
2253         case ISTATE_SEND_TASKMGTRSP:
2254                 ret = isert_put_tm_rsp(cmd, conn);
2255                 break;
2256         case ISTATE_SEND_REJECT:
2257                 ret = isert_put_reject(cmd, conn);
2258                 break;
2259         case ISTATE_SEND_TEXTRSP:
2260                 ret = isert_put_text_rsp(cmd, conn);
2261                 break;
2262         case ISTATE_SEND_STATUS:
2263                 /*
2264                  * Special case for sending non GOOD SCSI status from TX thread
2265                  * context during pre se_cmd excecution failure.
2266                  */
2267                 ret = isert_put_response(conn, cmd);
2268                 break;
2269         default:
2270                 isert_err("Unknown response state: 0x%02x\n", state);
2271                 ret = -EINVAL;
2272                 break;
2273         }
2274
2275         return ret;
2276 }
2277
2278 struct rdma_cm_id *
2279 isert_setup_id(struct isert_np *isert_np)
2280 {
2281         struct iscsi_np *np = isert_np->np;
2282         struct rdma_cm_id *id;
2283         struct sockaddr *sa;
2284         int ret;
2285
2286         sa = (struct sockaddr *)&np->np_sockaddr;
2287         isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2288
2289         id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2290                             RDMA_PS_TCP, IB_QPT_RC);
2291         if (IS_ERR(id)) {
2292                 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2293                 ret = PTR_ERR(id);
2294                 goto out;
2295         }
2296         isert_dbg("id %p context %p\n", id, id->context);
2297
2298         ret = rdma_bind_addr(id, sa);
2299         if (ret) {
2300                 isert_err("rdma_bind_addr() failed: %d\n", ret);
2301                 goto out_id;
2302         }
2303
2304         ret = rdma_listen(id, 0);
2305         if (ret) {
2306                 isert_err("rdma_listen() failed: %d\n", ret);
2307                 goto out_id;
2308         }
2309
2310         return id;
2311 out_id:
2312         rdma_destroy_id(id);
2313 out:
2314         return ERR_PTR(ret);
2315 }
2316
2317 static int
2318 isert_setup_np(struct iscsi_np *np,
2319                struct sockaddr_storage *ksockaddr)
2320 {
2321         struct isert_np *isert_np;
2322         struct rdma_cm_id *isert_lid;
2323         int ret;
2324
2325         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2326         if (!isert_np) {
2327                 isert_err("Unable to allocate struct isert_np\n");
2328                 return -ENOMEM;
2329         }
2330         sema_init(&isert_np->sem, 0);
2331         mutex_init(&isert_np->mutex);
2332         INIT_LIST_HEAD(&isert_np->accepted);
2333         INIT_LIST_HEAD(&isert_np->pending);
2334         isert_np->np = np;
2335
2336         /*
2337          * Setup the np->np_sockaddr from the passed sockaddr setup
2338          * in iscsi_target_configfs.c code..
2339          */
2340         memcpy(&np->np_sockaddr, ksockaddr,
2341                sizeof(struct sockaddr_storage));
2342
2343         isert_lid = isert_setup_id(isert_np);
2344         if (IS_ERR(isert_lid)) {
2345                 ret = PTR_ERR(isert_lid);
2346                 goto out;
2347         }
2348
2349         isert_np->cm_id = isert_lid;
2350         np->np_context = isert_np;
2351
2352         return 0;
2353
2354 out:
2355         kfree(isert_np);
2356
2357         return ret;
2358 }
2359
2360 static int
2361 isert_rdma_accept(struct isert_conn *isert_conn)
2362 {
2363         struct rdma_cm_id *cm_id = isert_conn->cm_id;
2364         struct rdma_conn_param cp;
2365         int ret;
2366         struct iser_cm_hdr rsp_hdr;
2367
2368         memset(&cp, 0, sizeof(struct rdma_conn_param));
2369         cp.initiator_depth = isert_conn->initiator_depth;
2370         cp.retry_count = 7;
2371         cp.rnr_retry_count = 7;
2372
2373         memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2374         rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2375         if (!isert_conn->snd_w_inv)
2376                 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2377         cp.private_data = (void *)&rsp_hdr;
2378         cp.private_data_len = sizeof(rsp_hdr);
2379
2380         ret = rdma_accept(cm_id, &cp);
2381         if (ret) {
2382                 isert_err("rdma_accept() failed with: %d\n", ret);
2383                 return ret;
2384         }
2385
2386         return 0;
2387 }
2388
2389 static int
2390 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2391 {
2392         struct isert_conn *isert_conn = conn->context;
2393         int ret;
2394
2395         isert_info("before login_req comp conn: %p\n", isert_conn);
2396         ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2397         if (ret) {
2398                 isert_err("isert_conn %p interrupted before got login req\n",
2399                           isert_conn);
2400                 return ret;
2401         }
2402         reinit_completion(&isert_conn->login_req_comp);
2403
2404         /*
2405          * For login requests after the first PDU, isert_rx_login_req() will
2406          * kick schedule_delayed_work(&conn->login_work) as the packet is
2407          * received, which turns this callback from iscsi_target_do_login_rx()
2408          * into a NOP.
2409          */
2410         if (!login->first_request)
2411                 return 0;
2412
2413         isert_rx_login_req(isert_conn);
2414
2415         isert_info("before login_comp conn: %p\n", conn);
2416         ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2417         if (ret)
2418                 return ret;
2419
2420         isert_info("processing login->req: %p\n", login->req);
2421
2422         return 0;
2423 }
2424
2425 static void
2426 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2427                     struct isert_conn *isert_conn)
2428 {
2429         struct rdma_cm_id *cm_id = isert_conn->cm_id;
2430         struct rdma_route *cm_route = &cm_id->route;
2431
2432         conn->login_family = np->np_sockaddr.ss_family;
2433
2434         conn->login_sockaddr = cm_route->addr.dst_addr;
2435         conn->local_sockaddr = cm_route->addr.src_addr;
2436 }
2437
2438 static int
2439 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2440 {
2441         struct isert_np *isert_np = np->np_context;
2442         struct isert_conn *isert_conn;
2443         int ret;
2444
2445 accept_wait:
2446         ret = down_interruptible(&isert_np->sem);
2447         if (ret)
2448                 return -ENODEV;
2449
2450         spin_lock_bh(&np->np_thread_lock);
2451         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2452                 spin_unlock_bh(&np->np_thread_lock);
2453                 isert_dbg("np_thread_state %d\n",
2454                          np->np_thread_state);
2455                 /**
2456                  * No point in stalling here when np_thread
2457                  * is in state RESET/SHUTDOWN/EXIT - bail
2458                  **/
2459                 return -ENODEV;
2460         }
2461         spin_unlock_bh(&np->np_thread_lock);
2462
2463         mutex_lock(&isert_np->mutex);
2464         if (list_empty(&isert_np->pending)) {
2465                 mutex_unlock(&isert_np->mutex);
2466                 goto accept_wait;
2467         }
2468         isert_conn = list_first_entry(&isert_np->pending,
2469                         struct isert_conn, node);
2470         list_del_init(&isert_conn->node);
2471         mutex_unlock(&isert_np->mutex);
2472
2473         conn->context = isert_conn;
2474         isert_conn->conn = conn;
2475         isert_conn->state = ISER_CONN_BOUND;
2476
2477         isert_set_conn_info(np, conn, isert_conn);
2478
2479         isert_dbg("Processing isert_conn: %p\n", isert_conn);
2480
2481         return 0;
2482 }
2483
2484 static void
2485 isert_free_np(struct iscsi_np *np)
2486 {
2487         struct isert_np *isert_np = np->np_context;
2488         struct isert_conn *isert_conn, *n;
2489
2490         if (isert_np->cm_id)
2491                 rdma_destroy_id(isert_np->cm_id);
2492
2493         /*
2494          * FIXME: At this point we don't have a good way to insure
2495          * that at this point we don't have hanging connections that
2496          * completed RDMA establishment but didn't start iscsi login
2497          * process. So work-around this by cleaning up what ever piled
2498          * up in accepted and pending lists.
2499          */
2500         mutex_lock(&isert_np->mutex);
2501         if (!list_empty(&isert_np->pending)) {
2502                 isert_info("Still have isert pending connections\n");
2503                 list_for_each_entry_safe(isert_conn, n,
2504                                          &isert_np->pending,
2505                                          node) {
2506                         isert_info("cleaning isert_conn %p state (%d)\n",
2507                                    isert_conn, isert_conn->state);
2508                         isert_connect_release(isert_conn);
2509                 }
2510         }
2511
2512         if (!list_empty(&isert_np->accepted)) {
2513                 isert_info("Still have isert accepted connections\n");
2514                 list_for_each_entry_safe(isert_conn, n,
2515                                          &isert_np->accepted,
2516                                          node) {
2517                         isert_info("cleaning isert_conn %p state (%d)\n",
2518                                    isert_conn, isert_conn->state);
2519                         isert_connect_release(isert_conn);
2520                 }
2521         }
2522         mutex_unlock(&isert_np->mutex);
2523
2524         np->np_context = NULL;
2525         kfree(isert_np);
2526 }
2527
2528 static void isert_release_work(struct work_struct *work)
2529 {
2530         struct isert_conn *isert_conn = container_of(work,
2531                                                      struct isert_conn,
2532                                                      release_work);
2533
2534         isert_info("Starting release conn %p\n", isert_conn);
2535
2536         mutex_lock(&isert_conn->mutex);
2537         isert_conn->state = ISER_CONN_DOWN;
2538         mutex_unlock(&isert_conn->mutex);
2539
2540         isert_info("Destroying conn %p\n", isert_conn);
2541         isert_put_conn(isert_conn);
2542 }
2543
2544 static void
2545 isert_wait4logout(struct isert_conn *isert_conn)
2546 {
2547         struct iscsi_conn *conn = isert_conn->conn;
2548
2549         isert_info("conn %p\n", isert_conn);
2550
2551         if (isert_conn->logout_posted) {
2552                 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2553                 wait_for_completion_timeout(&conn->conn_logout_comp,
2554                                             SECONDS_FOR_LOGOUT_COMP * HZ);
2555         }
2556 }
2557
2558 static void
2559 isert_wait4cmds(struct iscsi_conn *conn)
2560 {
2561         isert_info("iscsi_conn %p\n", conn);
2562
2563         if (conn->sess) {
2564                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2565                 target_wait_for_sess_cmds(conn->sess->se_sess);
2566         }
2567 }
2568
2569 /**
2570  * isert_put_unsol_pending_cmds() - Drop commands waiting for
2571  *     unsolicitate dataout
2572  * @conn:    iscsi connection
2573  *
2574  * We might still have commands that are waiting for unsolicited
2575  * dataouts messages. We must put the extra reference on those
2576  * before blocking on the target_wait_for_session_cmds
2577  */
2578 static void
2579 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
2580 {
2581         struct iscsi_cmd *cmd, *tmp;
2582         static LIST_HEAD(drop_cmd_list);
2583
2584         spin_lock_bh(&conn->cmd_lock);
2585         list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2586                 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2587                     (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2588                     (cmd->write_data_done < cmd->se_cmd.data_length))
2589                         list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2590         }
2591         spin_unlock_bh(&conn->cmd_lock);
2592
2593         list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2594                 list_del_init(&cmd->i_conn_node);
2595                 if (cmd->i_state != ISTATE_REMOVE) {
2596                         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2597
2598                         isert_info("conn %p dropping cmd %p\n", conn, cmd);
2599                         isert_put_cmd(isert_cmd, true);
2600                 }
2601         }
2602 }
2603
2604 static void isert_wait_conn(struct iscsi_conn *conn)
2605 {
2606         struct isert_conn *isert_conn = conn->context;
2607
2608         isert_info("Starting conn %p\n", isert_conn);
2609
2610         mutex_lock(&isert_conn->mutex);
2611         isert_conn_terminate(isert_conn);
2612         mutex_unlock(&isert_conn->mutex);
2613
2614         ib_drain_qp(isert_conn->qp);
2615         isert_put_unsol_pending_cmds(conn);
2616         isert_wait4cmds(conn);
2617         isert_wait4logout(isert_conn);
2618
2619         queue_work(isert_release_wq, &isert_conn->release_work);
2620 }
2621
2622 static void isert_free_conn(struct iscsi_conn *conn)
2623 {
2624         struct isert_conn *isert_conn = conn->context;
2625
2626         ib_drain_qp(isert_conn->qp);
2627         isert_put_conn(isert_conn);
2628 }
2629
2630 static void isert_get_rx_pdu(struct iscsi_conn *conn)
2631 {
2632         struct completion comp;
2633
2634         init_completion(&comp);
2635
2636         wait_for_completion_interruptible(&comp);
2637 }
2638
2639 static struct iscsit_transport iser_target_transport = {
2640         .name                   = "IB/iSER",
2641         .transport_type         = ISCSI_INFINIBAND,
2642         .rdma_shutdown          = true,
2643         .priv_size              = sizeof(struct isert_cmd),
2644         .owner                  = THIS_MODULE,
2645         .iscsit_setup_np        = isert_setup_np,
2646         .iscsit_accept_np       = isert_accept_np,
2647         .iscsit_free_np         = isert_free_np,
2648         .iscsit_wait_conn       = isert_wait_conn,
2649         .iscsit_free_conn       = isert_free_conn,
2650         .iscsit_get_login_rx    = isert_get_login_rx,
2651         .iscsit_put_login_tx    = isert_put_login_tx,
2652         .iscsit_immediate_queue = isert_immediate_queue,
2653         .iscsit_response_queue  = isert_response_queue,
2654         .iscsit_get_dataout     = isert_get_dataout,
2655         .iscsit_queue_data_in   = isert_put_datain,
2656         .iscsit_queue_status    = isert_put_response,
2657         .iscsit_aborted_task    = isert_aborted_task,
2658         .iscsit_get_rx_pdu      = isert_get_rx_pdu,
2659         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2660 };
2661
2662 static int __init isert_init(void)
2663 {
2664         int ret;
2665
2666         isert_comp_wq = alloc_workqueue("isert_comp_wq",
2667                                         WQ_UNBOUND | WQ_HIGHPRI, 0);
2668         if (!isert_comp_wq) {
2669                 isert_err("Unable to allocate isert_comp_wq\n");
2670                 ret = -ENOMEM;
2671                 return -ENOMEM;
2672         }
2673
2674         isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2675                                         WQ_UNBOUND_MAX_ACTIVE);
2676         if (!isert_release_wq) {
2677                 isert_err("Unable to allocate isert_release_wq\n");
2678                 ret = -ENOMEM;
2679                 goto destroy_comp_wq;
2680         }
2681
2682         iscsit_register_transport(&iser_target_transport);
2683         isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2684
2685         return 0;
2686
2687 destroy_comp_wq:
2688         destroy_workqueue(isert_comp_wq);
2689
2690         return ret;
2691 }
2692
2693 static void __exit isert_exit(void)
2694 {
2695         flush_scheduled_work();
2696         destroy_workqueue(isert_release_wq);
2697         destroy_workqueue(isert_comp_wq);
2698         iscsit_unregister_transport(&iser_target_transport);
2699         isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2700 }
2701
2702 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2703 MODULE_VERSION("1.0");
2704 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2705 MODULE_LICENSE("GPL");
2706
2707 module_init(isert_init);
2708 module_exit(isert_exit);