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      (ISERT_QP_MAX_REQ_DTOS  * ISERT_MAX_CONN)
  37 #define ISER_MAX_CQ_LEN         (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \
  38                                  ISERT_MAX_CONN)
  39
  40 static int isert_debug_level;
  41 module_param_named(debug_level, isert_debug_level, int, 0644);
  42 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
  43
  44 static DEFINE_MUTEX(device_list_mutex);
  45 static LIST_HEAD(device_list);
  46 static struct workqueue_struct *isert_comp_wq;
  47 static struct workqueue_struct *isert_release_wq;
  48
  49 static void
  50 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  51 static int
  52 isert_map_rdma(struct isert_cmd *isert_cmd, struct iscsi_conn *conn);
  53 static void
  54 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  55 static int
  56 isert_reg_rdma(struct isert_cmd *isert_cmd, struct iscsi_conn *conn);
  57 static int
  58 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
  59 static int
  60 isert_login_post_recv(struct isert_conn *isert_conn);
  61 static int
  62 isert_rdma_accept(struct isert_conn *isert_conn);
  63 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
  64
  65 static void isert_release_work(struct work_struct *work);
  66 static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc);
  67 static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
  68 static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
  69 static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc);
  70
  71 static inline bool
  72 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
  73 {
  74         return (conn->pi_support &&
  75                 cmd->prot_op != TARGET_PROT_NORMAL);
  76 }
  77
  78
  79 static void
  80 isert_qp_event_callback(struct ib_event *e, void *context)
  81 {
  82         struct isert_conn *isert_conn = context;
  83
  84         isert_err("%s (%d): conn %p\n",
  85                   ib_event_msg(e->event), e->event, isert_conn);
  86
  87         switch (e->event) {
  88         case IB_EVENT_COMM_EST:
  89                 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
  90                 break;
  91         case IB_EVENT_QP_LAST_WQE_REACHED:
  92                 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
  93                 break;
  94         default:
  95                 break;
  96         }
  97 }
  98
  99 static struct isert_comp *
 100 isert_comp_get(struct isert_conn *isert_conn)
 101 {
 102         struct isert_device *device = isert_conn->device;
 103         struct isert_comp *comp;
 104         int i, min = 0;
 105
 106         mutex_lock(&device_list_mutex);
 107         for (i = 0; i < device->comps_used; i++)
 108                 if (device->comps[i].active_qps <
 109                     device->comps[min].active_qps)
 110                         min = i;
 111         comp = &device->comps[min];
 112         comp->active_qps++;
 113         mutex_unlock(&device_list_mutex);
 114
 115         isert_info("conn %p, using comp %p min_index: %d\n",
 116                    isert_conn, comp, min);
 117
 118         return comp;
 119 }
 120
 121 static void
 122 isert_comp_put(struct isert_comp *comp)
 123 {
 124         mutex_lock(&device_list_mutex);
 125         comp->active_qps--;
 126         mutex_unlock(&device_list_mutex);
 127 }
 128
 129 static struct ib_qp *
 130 isert_create_qp(struct isert_conn *isert_conn,
 131                 struct isert_comp *comp,
 132                 struct rdma_cm_id *cma_id)
 133 {
 134         struct isert_device *device = isert_conn->device;
 135         struct ib_qp_init_attr attr;
 136         int ret;
 137
 138         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 139         attr.event_handler = isert_qp_event_callback;
 140         attr.qp_context = isert_conn;
 141         attr.send_cq = comp->cq;
 142         attr.recv_cq = comp->cq;
 143         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1;
 144         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
 145         attr.cap.max_send_sge = device->ib_device->attrs.max_sge;
 146         isert_conn->max_sge = min(device->ib_device->attrs.max_sge,
 147                                   device->ib_device->attrs.max_sge_rd);
 148         attr.cap.max_recv_sge = 1;
 149         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 150         attr.qp_type = IB_QPT_RC;
 151         if (device->pi_capable)
 152                 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
 153
 154         ret = rdma_create_qp(cma_id, device->pd, &attr);
 155         if (ret) {
 156                 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
 157                 return ERR_PTR(ret);
 158         }
 159
 160         return cma_id->qp;
 161 }
 162
 163 static int
 164 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
 165 {
 166         struct isert_comp *comp;
 167         int ret;
 168
 169         comp = isert_comp_get(isert_conn);
 170         isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
 171         if (IS_ERR(isert_conn->qp)) {
 172                 ret = PTR_ERR(isert_conn->qp);
 173                 goto err;
 174         }
 175
 176         return 0;
 177 err:
 178         isert_comp_put(comp);
 179         return ret;
 180 }
 181
 182 static int
 183 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 184 {
 185         struct isert_device *device = isert_conn->device;
 186         struct ib_device *ib_dev = device->ib_device;
 187         struct iser_rx_desc *rx_desc;
 188         struct ib_sge *rx_sg;
 189         u64 dma_addr;
 190         int i, j;
 191
 192         isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 193                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 194         if (!isert_conn->rx_descs)
 195                 goto fail;
 196
 197         rx_desc = isert_conn->rx_descs;
 198
 199         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 200                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 201                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 202                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 203                         goto dma_map_fail;
 204
 205                 rx_desc->dma_addr = dma_addr;
 206
 207                 rx_sg = &rx_desc->rx_sg;
 208                 rx_sg->addr = rx_desc->dma_addr;
 209                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 210                 rx_sg->lkey = device->pd->local_dma_lkey;
 211                 rx_desc->rx_cqe.done = isert_recv_done;
 212         }
 213
 214         return 0;
 215
 216 dma_map_fail:
 217         rx_desc = isert_conn->rx_descs;
 218         for (j = 0; j < i; j++, rx_desc++) {
 219                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 220                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 221         }
 222         kfree(isert_conn->rx_descs);
 223         isert_conn->rx_descs = NULL;
 224 fail:
 225         isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
 226
 227         return -ENOMEM;
 228 }
 229
 230 static void
 231 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 232 {
 233         struct ib_device *ib_dev = isert_conn->device->ib_device;
 234         struct iser_rx_desc *rx_desc;
 235         int i;
 236
 237         if (!isert_conn->rx_descs)
 238                 return;
 239
 240         rx_desc = isert_conn->rx_descs;
 241         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 242                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 243                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 244         }
 245
 246         kfree(isert_conn->rx_descs);
 247         isert_conn->rx_descs = NULL;
 248 }
 249
 250 static void
 251 isert_free_comps(struct isert_device *device)
 252 {
 253         int i;
 254
 255         for (i = 0; i < device->comps_used; i++) {
 256                 struct isert_comp *comp = &device->comps[i];
 257
 258                 if (comp->cq)
 259                         ib_free_cq(comp->cq);
 260         }
 261         kfree(device->comps);
 262 }
 263
 264 static int
 265 isert_alloc_comps(struct isert_device *device)
 266 {
 267         int i, max_cqe, ret = 0;
 268
 269         device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
 270                                  device->ib_device->num_comp_vectors));
 271
 272         isert_info("Using %d CQs, %s supports %d vectors support "
 273                    "Fast registration %d pi_capable %d\n",
 274                    device->comps_used, device->ib_device->name,
 275                    device->ib_device->num_comp_vectors, device->use_fastreg,
 276                    device->pi_capable);
 277
 278         device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
 279                                 GFP_KERNEL);
 280         if (!device->comps) {
 281                 isert_err("Unable to allocate completion contexts\n");
 282                 return -ENOMEM;
 283         }
 284
 285         max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
 286
 287         for (i = 0; i < device->comps_used; i++) {
 288                 struct isert_comp *comp = &device->comps[i];
 289
 290                 comp->device = device;
 291                 comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i,
 292                                 IB_POLL_WORKQUEUE);
 293                 if (IS_ERR(comp->cq)) {
 294                         isert_err("Unable to allocate cq\n");
 295                         ret = PTR_ERR(comp->cq);
 296                         comp->cq = NULL;
 297                         goto out_cq;
 298                 }
 299         }
 300
 301         return 0;
 302 out_cq:
 303         isert_free_comps(device);
 304         return ret;
 305 }
 306
 307 static int
 308 isert_create_device_ib_res(struct isert_device *device)
 309 {
 310         struct ib_device *ib_dev = device->ib_device;
 311         int ret;
 312
 313         isert_dbg("devattr->max_sge: %d\n", ib_dev->attrs.max_sge);
 314         isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
 315
 316         /* asign function handlers */
 317         if (ib_dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
 318             ib_dev->attrs.device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
 319                 device->use_fastreg = 1;
 320                 device->reg_rdma_mem = isert_reg_rdma;
 321                 device->unreg_rdma_mem = isert_unreg_rdma;
 322         } else {
 323                 device->use_fastreg = 0;
 324                 device->reg_rdma_mem = isert_map_rdma;
 325                 device->unreg_rdma_mem = isert_unmap_cmd;
 326         }
 327
 328         ret = isert_alloc_comps(device);
 329         if (ret)
 330                 goto out;
 331
 332         device->pd = ib_alloc_pd(ib_dev);
 333         if (IS_ERR(device->pd)) {
 334                 ret = PTR_ERR(device->pd);
 335                 isert_err("failed to allocate pd, device %p, ret=%d\n",
 336                           device, ret);
 337                 goto out_cq;
 338         }
 339
 340         /* Check signature cap */
 341         device->pi_capable = ib_dev->attrs.device_cap_flags &
 342                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 343
 344         return 0;
 345
 346 out_cq:
 347         isert_free_comps(device);
 348 out:
 349         if (ret > 0)
 350                 ret = -EINVAL;
 351         return ret;
 352 }
 353
 354 static void
 355 isert_free_device_ib_res(struct isert_device *device)
 356 {
 357         isert_info("device %p\n", device);
 358
 359         ib_dealloc_pd(device->pd);
 360         isert_free_comps(device);
 361 }
 362
 363 static void
 364 isert_device_put(struct isert_device *device)
 365 {
 366         mutex_lock(&device_list_mutex);
 367         device->refcount--;
 368         isert_info("device %p refcount %d\n", device, device->refcount);
 369         if (!device->refcount) {
 370                 isert_free_device_ib_res(device);
 371                 list_del(&device->dev_node);
 372                 kfree(device);
 373         }
 374         mutex_unlock(&device_list_mutex);
 375 }
 376
 377 static struct isert_device *
 378 isert_device_get(struct rdma_cm_id *cma_id)
 379 {
 380         struct isert_device *device;
 381         int ret;
 382
 383         mutex_lock(&device_list_mutex);
 384         list_for_each_entry(device, &device_list, dev_node) {
 385                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 386                         device->refcount++;
 387                         isert_info("Found iser device %p refcount %d\n",
 388                                    device, device->refcount);
 389                         mutex_unlock(&device_list_mutex);
 390                         return device;
 391                 }
 392         }
 393
 394         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 395         if (!device) {
 396                 mutex_unlock(&device_list_mutex);
 397                 return ERR_PTR(-ENOMEM);
 398         }
 399
 400         INIT_LIST_HEAD(&device->dev_node);
 401
 402         device->ib_device = cma_id->device;
 403         ret = isert_create_device_ib_res(device);
 404         if (ret) {
 405                 kfree(device);
 406                 mutex_unlock(&device_list_mutex);
 407                 return ERR_PTR(ret);
 408         }
 409
 410         device->refcount++;
 411         list_add_tail(&device->dev_node, &device_list);
 412         isert_info("Created a new iser device %p refcount %d\n",
 413                    device, device->refcount);
 414         mutex_unlock(&device_list_mutex);
 415
 416         return device;
 417 }
 418
 419 static void
 420 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
 421 {
 422         struct fast_reg_descriptor *fr_desc, *tmp;
 423         int i = 0;
 424
 425         if (list_empty(&isert_conn->fr_pool))
 426                 return;
 427
 428         isert_info("Freeing conn %p fastreg pool", isert_conn);
 429
 430         list_for_each_entry_safe(fr_desc, tmp,
 431                                  &isert_conn->fr_pool, list) {
 432                 list_del(&fr_desc->list);
 433                 ib_dereg_mr(fr_desc->data_mr);
 434                 if (fr_desc->pi_ctx) {
 435                         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 436                         ib_dereg_mr(fr_desc->pi_ctx->sig_mr);
 437                         kfree(fr_desc->pi_ctx);
 438                 }
 439                 kfree(fr_desc);
 440                 ++i;
 441         }
 442
 443         if (i < isert_conn->fr_pool_size)
 444                 isert_warn("Pool still has %d regions registered\n",
 445                         isert_conn->fr_pool_size - i);
 446 }
 447
 448 static int
 449 isert_create_pi_ctx(struct fast_reg_descriptor *desc,
 450                     struct ib_device *device,
 451                     struct ib_pd *pd)
 452 {
 453         struct pi_context *pi_ctx;
 454         int ret;
 455
 456         pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
 457         if (!pi_ctx) {
 458                 isert_err("Failed to allocate pi context\n");
 459                 return -ENOMEM;
 460         }
 461
 462         pi_ctx->prot_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
 463                                       ISCSI_ISER_SG_TABLESIZE);
 464         if (IS_ERR(pi_ctx->prot_mr)) {
 465                 isert_err("Failed to allocate prot frmr err=%ld\n",
 466                           PTR_ERR(pi_ctx->prot_mr));
 467                 ret = PTR_ERR(pi_ctx->prot_mr);
 468                 goto err_pi_ctx;
 469         }
 470         desc->ind |= ISERT_PROT_KEY_VALID;
 471
 472         pi_ctx->sig_mr = ib_alloc_mr(pd, IB_MR_TYPE_SIGNATURE, 2);
 473         if (IS_ERR(pi_ctx->sig_mr)) {
 474                 isert_err("Failed to allocate signature enabled mr err=%ld\n",
 475                           PTR_ERR(pi_ctx->sig_mr));
 476                 ret = PTR_ERR(pi_ctx->sig_mr);
 477                 goto err_prot_mr;
 478         }
 479
 480         desc->pi_ctx = pi_ctx;
 481         desc->ind |= ISERT_SIG_KEY_VALID;
 482         desc->ind &= ~ISERT_PROTECTED;
 483
 484         return 0;
 485
 486 err_prot_mr:
 487         ib_dereg_mr(pi_ctx->prot_mr);
 488 err_pi_ctx:
 489         kfree(pi_ctx);
 490
 491         return ret;
 492 }
 493
 494 static int
 495 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
 496                      struct fast_reg_descriptor *fr_desc)
 497 {
 498         fr_desc->data_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
 499                                        ISCSI_ISER_SG_TABLESIZE);
 500         if (IS_ERR(fr_desc->data_mr)) {
 501                 isert_err("Failed to allocate data frmr err=%ld\n",
 502                           PTR_ERR(fr_desc->data_mr));
 503                 return PTR_ERR(fr_desc->data_mr);
 504         }
 505         fr_desc->ind |= ISERT_DATA_KEY_VALID;
 506
 507         isert_dbg("Created fr_desc %p\n", fr_desc);
 508
 509         return 0;
 510 }
 511
 512 static int
 513 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
 514 {
 515         struct fast_reg_descriptor *fr_desc;
 516         struct isert_device *device = isert_conn->device;
 517         struct se_session *se_sess = isert_conn->conn->sess->se_sess;
 518         struct se_node_acl *se_nacl = se_sess->se_node_acl;
 519         int i, ret, tag_num;
 520         /*
 521          * Setup the number of FRMRs based upon the number of tags
 522          * available to session in iscsi_target_locate_portal().
 523          */
 524         tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
 525         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
 526
 527         isert_conn->fr_pool_size = 0;
 528         for (i = 0; i < tag_num; i++) {
 529                 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
 530                 if (!fr_desc) {
 531                         isert_err("Failed to allocate fast_reg descriptor\n");
 532                         ret = -ENOMEM;
 533                         goto err;
 534                 }
 535
 536                 ret = isert_create_fr_desc(device->ib_device,
 537                                            device->pd, fr_desc);
 538                 if (ret) {
 539                         isert_err("Failed to create fastreg descriptor err=%d\n",
 540                                ret);
 541                         kfree(fr_desc);
 542                         goto err;
 543                 }
 544
 545                 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
 546                 isert_conn->fr_pool_size++;
 547         }
 548
 549         isert_dbg("Creating conn %p fastreg pool size=%d",
 550                  isert_conn, isert_conn->fr_pool_size);
 551
 552         return 0;
 553
 554 err:
 555         isert_conn_free_fastreg_pool(isert_conn);
 556         return ret;
 557 }
 558
 559 static void
 560 isert_init_conn(struct isert_conn *isert_conn)
 561 {
 562         isert_conn->state = ISER_CONN_INIT;
 563         INIT_LIST_HEAD(&isert_conn->node);
 564         init_completion(&isert_conn->login_comp);
 565         init_completion(&isert_conn->login_req_comp);
 566         kref_init(&isert_conn->kref);
 567         mutex_init(&isert_conn->mutex);
 568         spin_lock_init(&isert_conn->pool_lock);
 569         INIT_LIST_HEAD(&isert_conn->fr_pool);
 570         INIT_WORK(&isert_conn->release_work, isert_release_work);
 571 }
 572
 573 static void
 574 isert_free_login_buf(struct isert_conn *isert_conn)
 575 {
 576         struct ib_device *ib_dev = isert_conn->device->ib_device;
 577
 578         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 579                             ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
 580         kfree(isert_conn->login_rsp_buf);
 581
 582         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 583                             ISER_RX_PAYLOAD_SIZE,
 584                             DMA_FROM_DEVICE);
 585         kfree(isert_conn->login_req_buf);
 586 }
 587
 588 static int
 589 isert_alloc_login_buf(struct isert_conn *isert_conn,
 590                       struct ib_device *ib_dev)
 591 {
 592         int ret;
 593
 594         isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
 595                         GFP_KERNEL);
 596         if (!isert_conn->login_req_buf) {
 597                 isert_err("Unable to allocate isert_conn->login_buf\n");
 598                 return -ENOMEM;
 599         }
 600
 601         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 602                                 isert_conn->login_req_buf,
 603                                 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 604         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 605         if (ret) {
 606                 isert_err("login_req_dma mapping error: %d\n", ret);
 607                 isert_conn->login_req_dma = 0;
 608                 goto out_free_login_req_buf;
 609         }
 610
 611         isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
 612         if (!isert_conn->login_rsp_buf) {
 613                 isert_err("Unable to allocate isert_conn->login_rspbuf\n");
 614                 goto out_unmap_login_req_buf;
 615         }
 616
 617         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 618                                         isert_conn->login_rsp_buf,
 619                                         ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
 620         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 621         if (ret) {
 622                 isert_err("login_rsp_dma mapping error: %d\n", ret);
 623                 isert_conn->login_rsp_dma = 0;
 624                 goto out_free_login_rsp_buf;
 625         }
 626
 627         return 0;
 628
 629 out_free_login_rsp_buf:
 630         kfree(isert_conn->login_rsp_buf);
 631 out_unmap_login_req_buf:
 632         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 633                             ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 634 out_free_login_req_buf:
 635         kfree(isert_conn->login_req_buf);
 636         return ret;
 637 }
 638
 639 static void
 640 isert_set_nego_params(struct isert_conn *isert_conn,
 641                       struct rdma_conn_param *param)
 642 {
 643         struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
 644
 645         /* Set max inflight RDMA READ requests */
 646         isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
 647                                 attr->max_qp_init_rd_atom);
 648         isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
 649
 650         if (param->private_data) {
 651                 u8 flags = *(u8 *)param->private_data;
 652
 653                 /*
 654                  * use remote invalidation if the both initiator
 655                  * and the HCA support it
 656                  */
 657                 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
 658                                           (attr->device_cap_flags &
 659                                            IB_DEVICE_MEM_MGT_EXTENSIONS);
 660                 if (isert_conn->snd_w_inv)
 661                         isert_info("Using remote invalidation\n");
 662         }
 663 }
 664
 665 static int
 666 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 667 {
 668         struct isert_np *isert_np = cma_id->context;
 669         struct iscsi_np *np = isert_np->np;
 670         struct isert_conn *isert_conn;
 671         struct isert_device *device;
 672         int ret = 0;
 673
 674         spin_lock_bh(&np->np_thread_lock);
 675         if (!np->enabled) {
 676                 spin_unlock_bh(&np->np_thread_lock);
 677                 isert_dbg("iscsi_np is not enabled, reject connect request\n");
 678                 return rdma_reject(cma_id, NULL, 0);
 679         }
 680         spin_unlock_bh(&np->np_thread_lock);
 681
 682         isert_dbg("cma_id: %p, portal: %p\n",
 683                  cma_id, cma_id->context);
 684
 685         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 686         if (!isert_conn)
 687                 return -ENOMEM;
 688
 689         isert_init_conn(isert_conn);
 690         isert_conn->cm_id = cma_id;
 691
 692         ret = isert_alloc_login_buf(isert_conn, cma_id->device);
 693         if (ret)
 694                 goto out;
 695
 696         device = isert_device_get(cma_id);
 697         if (IS_ERR(device)) {
 698                 ret = PTR_ERR(device);
 699                 goto out_rsp_dma_map;
 700         }
 701         isert_conn->device = device;
 702
 703         isert_set_nego_params(isert_conn, &event->param.conn);
 704
 705         ret = isert_conn_setup_qp(isert_conn, cma_id);
 706         if (ret)
 707                 goto out_conn_dev;
 708
 709         ret = isert_login_post_recv(isert_conn);
 710         if (ret)
 711                 goto out_conn_dev;
 712
 713         ret = isert_rdma_accept(isert_conn);
 714         if (ret)
 715                 goto out_conn_dev;
 716
 717         mutex_lock(&isert_np->mutex);
 718         list_add_tail(&isert_conn->node, &isert_np->accepted);
 719         mutex_unlock(&isert_np->mutex);
 720
 721         return 0;
 722
 723 out_conn_dev:
 724         isert_device_put(device);
 725 out_rsp_dma_map:
 726         isert_free_login_buf(isert_conn);
 727 out:
 728         kfree(isert_conn);
 729         rdma_reject(cma_id, NULL, 0);
 730         return ret;
 731 }
 732
 733 static void
 734 isert_connect_release(struct isert_conn *isert_conn)
 735 {
 736         struct isert_device *device = isert_conn->device;
 737
 738         isert_dbg("conn %p\n", isert_conn);
 739
 740         BUG_ON(!device);
 741
 742         if (device->use_fastreg)
 743                 isert_conn_free_fastreg_pool(isert_conn);
 744
 745         isert_free_rx_descriptors(isert_conn);
 746         if (isert_conn->cm_id)
 747                 rdma_destroy_id(isert_conn->cm_id);
 748
 749         if (isert_conn->qp) {
 750                 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
 751
 752                 isert_comp_put(comp);
 753                 ib_destroy_qp(isert_conn->qp);
 754         }
 755
 756         if (isert_conn->login_req_buf)
 757                 isert_free_login_buf(isert_conn);
 758
 759         isert_device_put(device);
 760
 761         kfree(isert_conn);
 762 }
 763
 764 static void
 765 isert_connected_handler(struct rdma_cm_id *cma_id)
 766 {
 767         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 768         struct isert_np *isert_np = cma_id->context;
 769
 770         isert_info("conn %p\n", isert_conn);
 771
 772         mutex_lock(&isert_conn->mutex);
 773         isert_conn->state = ISER_CONN_UP;
 774         kref_get(&isert_conn->kref);
 775         mutex_unlock(&isert_conn->mutex);
 776
 777         mutex_lock(&isert_np->mutex);
 778         list_move_tail(&isert_conn->node, &isert_np->pending);
 779         mutex_unlock(&isert_np->mutex);
 780
 781         isert_info("np %p: Allow accept_np to continue\n", isert_np);
 782         up(&isert_np->sem);
 783 }
 784
 785 static void
 786 isert_release_kref(struct kref *kref)
 787 {
 788         struct isert_conn *isert_conn = container_of(kref,
 789                                 struct isert_conn, kref);
 790
 791         isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
 792                    current->pid);
 793
 794         isert_connect_release(isert_conn);
 795 }
 796
 797 static void
 798 isert_put_conn(struct isert_conn *isert_conn)
 799 {
 800         kref_put(&isert_conn->kref, isert_release_kref);
 801 }
 802
 803 static void
 804 isert_handle_unbound_conn(struct isert_conn *isert_conn)
 805 {
 806         struct isert_np *isert_np = isert_conn->cm_id->context;
 807
 808         mutex_lock(&isert_np->mutex);
 809         if (!list_empty(&isert_conn->node)) {
 810                 /*
 811                  * This means iscsi doesn't know this connection
 812                  * so schedule a cleanup ourselves
 813                  */
 814                 list_del_init(&isert_conn->node);
 815                 isert_put_conn(isert_conn);
 816                 queue_work(isert_release_wq, &isert_conn->release_work);
 817         }
 818         mutex_unlock(&isert_np->mutex);
 819 }
 820
 821 /**
 822  * isert_conn_terminate() - Initiate connection termination
 823  * @isert_conn: isert connection struct
 824  *
 825  * Notes:
 826  * In case the connection state is BOUND, move state
 827  * to TEMINATING and start teardown sequence (rdma_disconnect).
 828  * In case the connection state is UP, complete flush as well.
 829  *
 830  * This routine must be called with mutex held. Thus it is
 831  * safe to call multiple times.
 832  */
 833 static void
 834 isert_conn_terminate(struct isert_conn *isert_conn)
 835 {
 836         int err;
 837
 838         if (isert_conn->state >= ISER_CONN_TERMINATING)
 839                 return;
 840
 841         isert_info("Terminating conn %p state %d\n",
 842                    isert_conn, isert_conn->state);
 843         isert_conn->state = ISER_CONN_TERMINATING;
 844         err = rdma_disconnect(isert_conn->cm_id);
 845         if (err)
 846                 isert_warn("Failed rdma_disconnect isert_conn %p\n",
 847                            isert_conn);
 848 }
 849
 850 static int
 851 isert_np_cma_handler(struct isert_np *isert_np,
 852                      enum rdma_cm_event_type event)
 853 {
 854         isert_dbg("%s (%d): isert np %p\n",
 855                   rdma_event_msg(event), event, isert_np);
 856
 857         switch (event) {
 858         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 859                 isert_np->cm_id = NULL;
 860                 break;
 861         case RDMA_CM_EVENT_ADDR_CHANGE:
 862                 isert_np->cm_id = isert_setup_id(isert_np);
 863                 if (IS_ERR(isert_np->cm_id)) {
 864                         isert_err("isert np %p setup id failed: %ld\n",
 865                                   isert_np, PTR_ERR(isert_np->cm_id));
 866                         isert_np->cm_id = NULL;
 867                 }
 868                 break;
 869         default:
 870                 isert_err("isert np %p Unexpected event %d\n",
 871                           isert_np, event);
 872         }
 873
 874         return -1;
 875 }
 876
 877 static int
 878 isert_disconnected_handler(struct rdma_cm_id *cma_id,
 879                            enum rdma_cm_event_type event)
 880 {
 881         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 882
 883         mutex_lock(&isert_conn->mutex);
 884         switch (isert_conn->state) {
 885         case ISER_CONN_TERMINATING:
 886                 break;
 887         case ISER_CONN_UP:
 888                 isert_conn_terminate(isert_conn);
 889                 ib_drain_qp(isert_conn->qp);
 890                 isert_handle_unbound_conn(isert_conn);
 891                 break;
 892         case ISER_CONN_BOUND:
 893         case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
 894                 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
 895                 break;
 896         default:
 897                 isert_warn("conn %p teminating in state %d\n",
 898                            isert_conn, isert_conn->state);
 899         }
 900         mutex_unlock(&isert_conn->mutex);
 901
 902         return 0;
 903 }
 904
 905 static int
 906 isert_connect_error(struct rdma_cm_id *cma_id)
 907 {
 908         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 909
 910         list_del_init(&isert_conn->node);
 911         isert_conn->cm_id = NULL;
 912         isert_put_conn(isert_conn);
 913
 914         return -1;
 915 }
 916
 917 static int
 918 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 919 {
 920         struct isert_np *isert_np = cma_id->context;
 921         int ret = 0;
 922
 923         isert_info("%s (%d): status %d id %p np %p\n",
 924                    rdma_event_msg(event->event), event->event,
 925                    event->status, cma_id, cma_id->context);
 926
 927         if (isert_np->cm_id == cma_id)
 928                 return isert_np_cma_handler(cma_id->context, event->event);
 929
 930         switch (event->event) {
 931         case RDMA_CM_EVENT_CONNECT_REQUEST:
 932                 ret = isert_connect_request(cma_id, event);
 933                 if (ret)
 934                         isert_err("failed handle connect request %d\n", ret);
 935                 break;
 936         case RDMA_CM_EVENT_ESTABLISHED:
 937                 isert_connected_handler(cma_id);
 938                 break;
 939         case RDMA_CM_EVENT_ADDR_CHANGE:    /* FALLTHRU */
 940         case RDMA_CM_EVENT_DISCONNECTED:   /* FALLTHRU */
 941         case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
 942         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
 943                 ret = isert_disconnected_handler(cma_id, event->event);
 944                 break;
 945         case RDMA_CM_EVENT_REJECTED:       /* FALLTHRU */
 946         case RDMA_CM_EVENT_UNREACHABLE:    /* FALLTHRU */
 947         case RDMA_CM_EVENT_CONNECT_ERROR:
 948                 ret = isert_connect_error(cma_id);
 949                 break;
 950         default:
 951                 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
 952                 break;
 953         }
 954
 955         return ret;
 956 }
 957
 958 static int
 959 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
 960 {
 961         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 962         int i, ret;
 963         struct iser_rx_desc *rx_desc;
 964
 965         for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
 966                 rx_desc = &isert_conn->rx_descs[i];
 967
 968                 rx_wr->wr_cqe = &rx_desc->rx_cqe;
 969                 rx_wr->sg_list = &rx_desc->rx_sg;
 970                 rx_wr->num_sge = 1;
 971                 rx_wr->next = rx_wr + 1;
 972         }
 973         rx_wr--;
 974         rx_wr->next = NULL; /* mark end of work requests list */
 975
 976         ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
 977                            &rx_wr_failed);
 978         if (ret)
 979                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 980
 981         return ret;
 982 }
 983
 984 static int
 985 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
 986 {
 987         struct ib_recv_wr *rx_wr_failed, rx_wr;
 988         int ret;
 989
 990         rx_wr.wr_cqe = &rx_desc->rx_cqe;
 991         rx_wr.sg_list = &rx_desc->rx_sg;
 992         rx_wr.num_sge = 1;
 993         rx_wr.next = NULL;
 994
 995         ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
 996         if (ret)
 997                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 998
 999         return ret;
1000 }
1001
1002 static int
1003 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
1004 {
1005         struct ib_device *ib_dev = isert_conn->cm_id->device;
1006         struct ib_send_wr send_wr, *send_wr_failed;
1007         int ret;
1008
1009         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
1010                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
1011
1012         tx_desc->tx_cqe.done = isert_login_send_done;
1013
1014         send_wr.next    = NULL;
1015         send_wr.wr_cqe  = &tx_desc->tx_cqe;
1016         send_wr.sg_list = tx_desc->tx_sg;
1017         send_wr.num_sge = tx_desc->num_sge;
1018         send_wr.opcode  = IB_WR_SEND;
1019         send_wr.send_flags = IB_SEND_SIGNALED;
1020
1021         ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
1022         if (ret)
1023                 isert_err("ib_post_send() failed, ret: %d\n", ret);
1024
1025         return ret;
1026 }
1027
1028 static void
1029 isert_create_send_desc(struct isert_conn *isert_conn,
1030                        struct isert_cmd *isert_cmd,
1031                        struct iser_tx_desc *tx_desc)
1032 {
1033         struct isert_device *device = isert_conn->device;
1034         struct ib_device *ib_dev = device->ib_device;
1035
1036         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
1037                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
1038
1039         memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
1040         tx_desc->iser_header.flags = ISCSI_CTRL;
1041
1042         tx_desc->num_sge = 1;
1043
1044         if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
1045                 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
1046                 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
1047         }
1048 }
1049
1050 static int
1051 isert_init_tx_hdrs(struct isert_conn *isert_conn,
1052                    struct iser_tx_desc *tx_desc)
1053 {
1054         struct isert_device *device = isert_conn->device;
1055         struct ib_device *ib_dev = device->ib_device;
1056         u64 dma_addr;
1057
1058         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
1059                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
1060         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
1061                 isert_err("ib_dma_mapping_error() failed\n");
1062                 return -ENOMEM;
1063         }
1064
1065         tx_desc->dma_addr = dma_addr;
1066         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
1067         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
1068         tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
1069
1070         isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
1071                   tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
1072                   tx_desc->tx_sg[0].lkey);
1073
1074         return 0;
1075 }
1076
1077 static void
1078 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1079                    struct ib_send_wr *send_wr)
1080 {
1081         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
1082
1083         isert_cmd->iser_ib_op = ISER_IB_SEND;
1084         tx_desc->tx_cqe.done = isert_send_done;
1085         send_wr->wr_cqe = &tx_desc->tx_cqe;
1086
1087         if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
1088                 send_wr->opcode  = IB_WR_SEND_WITH_INV;
1089                 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
1090         } else {
1091                 send_wr->opcode = IB_WR_SEND;
1092         }
1093
1094         send_wr->sg_list = &tx_desc->tx_sg[0];
1095         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
1096         send_wr->send_flags = IB_SEND_SIGNALED;
1097 }
1098
1099 static int
1100 isert_login_post_recv(struct isert_conn *isert_conn)
1101 {
1102         struct ib_recv_wr rx_wr, *rx_wr_fail;
1103         struct ib_sge sge;
1104         int ret;
1105
1106         memset(&sge, 0, sizeof(struct ib_sge));
1107         sge.addr = isert_conn->login_req_dma;
1108         sge.length = ISER_RX_PAYLOAD_SIZE;
1109         sge.lkey = isert_conn->device->pd->local_dma_lkey;
1110
1111         isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
1112                 sge.addr, sge.length, sge.lkey);
1113
1114         isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
1115
1116         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1117         rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
1118         rx_wr.sg_list = &sge;
1119         rx_wr.num_sge = 1;
1120
1121         ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
1122         if (ret)
1123                 isert_err("ib_post_recv() failed: %d\n", ret);
1124
1125         return ret;
1126 }
1127
1128 static int
1129 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1130                    u32 length)
1131 {
1132         struct isert_conn *isert_conn = conn->context;
1133         struct isert_device *device = isert_conn->device;
1134         struct ib_device *ib_dev = device->ib_device;
1135         struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
1136         int ret;
1137
1138         isert_create_send_desc(isert_conn, NULL, tx_desc);
1139
1140         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1141                sizeof(struct iscsi_hdr));
1142
1143         isert_init_tx_hdrs(isert_conn, tx_desc);
1144
1145         if (length > 0) {
1146                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1147
1148                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1149                                            length, DMA_TO_DEVICE);
1150
1151                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1152
1153                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1154                                               length, DMA_TO_DEVICE);
1155
1156                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1157                 tx_dsg->length  = length;
1158                 tx_dsg->lkey    = isert_conn->device->pd->local_dma_lkey;
1159                 tx_desc->num_sge = 2;
1160         }
1161         if (!login->login_failed) {
1162                 if (login->login_complete) {
1163                         if (!conn->sess->sess_ops->SessionType &&
1164                             isert_conn->device->use_fastreg) {
1165                                 ret = isert_conn_create_fastreg_pool(isert_conn);
1166                                 if (ret) {
1167                                         isert_err("Conn: %p failed to create"
1168                                                " fastreg pool\n", isert_conn);
1169                                         return ret;
1170                                 }
1171                         }
1172
1173                         ret = isert_alloc_rx_descriptors(isert_conn);
1174                         if (ret)
1175                                 return ret;
1176
1177                         ret = isert_post_recvm(isert_conn,
1178                                                ISERT_QP_MAX_RECV_DTOS);
1179                         if (ret)
1180                                 return ret;
1181
1182                         /* Now we are in FULL_FEATURE phase */
1183                         mutex_lock(&isert_conn->mutex);
1184                         isert_conn->state = ISER_CONN_FULL_FEATURE;
1185                         mutex_unlock(&isert_conn->mutex);
1186                         goto post_send;
1187                 }
1188
1189                 ret = isert_login_post_recv(isert_conn);
1190                 if (ret)
1191                         return ret;
1192         }
1193 post_send:
1194         ret = isert_login_post_send(isert_conn, tx_desc);
1195         if (ret)
1196                 return ret;
1197
1198         return 0;
1199 }
1200
1201 static void
1202 isert_rx_login_req(struct isert_conn *isert_conn)
1203 {
1204         struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1205         int rx_buflen = isert_conn->login_req_len;
1206         struct iscsi_conn *conn = isert_conn->conn;
1207         struct iscsi_login *login = conn->conn_login;
1208         int size;
1209
1210         isert_info("conn %p\n", isert_conn);
1211
1212         WARN_ON_ONCE(!login);
1213
1214         if (login->first_request) {
1215                 struct iscsi_login_req *login_req =
1216                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1217                 /*
1218                  * Setup the initial iscsi_login values from the leading
1219                  * login request PDU.
1220                  */
1221                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1222                 login->current_stage =
1223                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1224                          >> 2;
1225                 login->version_min      = login_req->min_version;
1226                 login->version_max      = login_req->max_version;
1227                 memcpy(login->isid, login_req->isid, 6);
1228                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1229                 login->init_task_tag    = login_req->itt;
1230                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1231                 login->cid              = be16_to_cpu(login_req->cid);
1232                 login->tsih             = be16_to_cpu(login_req->tsih);
1233         }
1234
1235         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1236
1237         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1238         isert_dbg("Using login payload size: %d, rx_buflen: %d "
1239                   "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1240                   MAX_KEY_VALUE_PAIRS);
1241         memcpy(login->req_buf, &rx_desc->data[0], size);
1242
1243         if (login->first_request) {
1244                 complete(&isert_conn->login_comp);
1245                 return;
1246         }
1247         schedule_delayed_work(&conn->login_work, 0);
1248 }
1249
1250 static struct iscsi_cmd
1251 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1252 {
1253         struct isert_conn *isert_conn = conn->context;
1254         struct isert_cmd *isert_cmd;
1255         struct iscsi_cmd *cmd;
1256
1257         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1258         if (!cmd) {
1259                 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1260                 return NULL;
1261         }
1262         isert_cmd = iscsit_priv_cmd(cmd);
1263         isert_cmd->conn = isert_conn;
1264         isert_cmd->iscsi_cmd = cmd;
1265         isert_cmd->rx_desc = rx_desc;
1266
1267         return cmd;
1268 }
1269
1270 static int
1271 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1272                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1273                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1274 {
1275         struct iscsi_conn *conn = isert_conn->conn;
1276         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1277         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1278         bool dump_payload = false;
1279         unsigned int data_len;
1280
1281         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1282         if (rc < 0)
1283                 return rc;
1284
1285         imm_data = cmd->immediate_data;
1286         imm_data_len = cmd->first_burst_len;
1287         unsol_data = cmd->unsolicited_data;
1288         data_len = cmd->se_cmd.data_length;
1289
1290         if (imm_data && imm_data_len == data_len)
1291                 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1292         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1293         if (rc < 0) {
1294                 return 0;
1295         } else if (rc > 0) {
1296                 dump_payload = true;
1297                 goto sequence_cmd;
1298         }
1299
1300         if (!imm_data)
1301                 return 0;
1302
1303         if (imm_data_len != data_len) {
1304                 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1305                 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1306                                     &rx_desc->data[0], imm_data_len);
1307                 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1308                           sg_nents, imm_data_len);
1309         } else {
1310                 sg_init_table(&isert_cmd->sg, 1);
1311                 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1312                 cmd->se_cmd.t_data_nents = 1;
1313                 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1314                 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1315                           imm_data_len);
1316         }
1317
1318         cmd->write_data_done += imm_data_len;
1319
1320         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1321                 spin_lock_bh(&cmd->istate_lock);
1322                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1323                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1324                 spin_unlock_bh(&cmd->istate_lock);
1325         }
1326
1327 sequence_cmd:
1328         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1329
1330         if (!rc && dump_payload == false && unsol_data)
1331                 iscsit_set_unsoliticed_dataout(cmd);
1332         else if (dump_payload && imm_data)
1333                 target_put_sess_cmd(&cmd->se_cmd);
1334
1335         return 0;
1336 }
1337
1338 static int
1339 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1340                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1341 {
1342         struct scatterlist *sg_start;
1343         struct iscsi_conn *conn = isert_conn->conn;
1344         struct iscsi_cmd *cmd = NULL;
1345         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1346         u32 unsol_data_len = ntoh24(hdr->dlength);
1347         int rc, sg_nents, sg_off, page_off;
1348
1349         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1350         if (rc < 0)
1351                 return rc;
1352         else if (!cmd)
1353                 return 0;
1354         /*
1355          * FIXME: Unexpected unsolicited_data out
1356          */
1357         if (!cmd->unsolicited_data) {
1358                 isert_err("Received unexpected solicited data payload\n");
1359                 dump_stack();
1360                 return -1;
1361         }
1362
1363         isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1364                   "write_data_done: %u, data_length: %u\n",
1365                   unsol_data_len,  cmd->write_data_done,
1366                   cmd->se_cmd.data_length);
1367
1368         sg_off = cmd->write_data_done / PAGE_SIZE;
1369         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1370         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1371         page_off = cmd->write_data_done % PAGE_SIZE;
1372         /*
1373          * FIXME: Non page-aligned unsolicited_data out
1374          */
1375         if (page_off) {
1376                 isert_err("unexpected non-page aligned data payload\n");
1377                 dump_stack();
1378                 return -1;
1379         }
1380         isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1381                   "sg_nents: %u from %p %u\n", sg_start, sg_off,
1382                   sg_nents, &rx_desc->data[0], unsol_data_len);
1383
1384         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1385                             unsol_data_len);
1386
1387         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1388         if (rc < 0)
1389                 return rc;
1390
1391         /*
1392          * multiple data-outs on the same command can arrive -
1393          * so post the buffer before hand
1394          */
1395         rc = isert_post_recv(isert_conn, rx_desc);
1396         if (rc) {
1397                 isert_err("ib_post_recv failed with %d\n", rc);
1398                 return rc;
1399         }
1400         return 0;
1401 }
1402
1403 static int
1404 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1405                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1406                      unsigned char *buf)
1407 {
1408         struct iscsi_conn *conn = isert_conn->conn;
1409         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1410         int rc;
1411
1412         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1413         if (rc < 0)
1414                 return rc;
1415         /*
1416          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1417          */
1418
1419         return iscsit_process_nop_out(conn, cmd, hdr);
1420 }
1421
1422 static int
1423 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1424                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1425                       struct iscsi_text *hdr)
1426 {
1427         struct iscsi_conn *conn = isert_conn->conn;
1428         u32 payload_length = ntoh24(hdr->dlength);
1429         int rc;
1430         unsigned char *text_in = NULL;
1431
1432         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1433         if (rc < 0)
1434                 return rc;
1435
1436         if (payload_length) {
1437                 text_in = kzalloc(payload_length, GFP_KERNEL);
1438                 if (!text_in) {
1439                         isert_err("Unable to allocate text_in of payload_length: %u\n",
1440                                   payload_length);
1441                         return -ENOMEM;
1442                 }
1443         }
1444         cmd->text_in_ptr = text_in;
1445
1446         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1447
1448         return iscsit_process_text_cmd(conn, cmd, hdr);
1449 }
1450
1451 static int
1452 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1453                 uint32_t read_stag, uint64_t read_va,
1454                 uint32_t write_stag, uint64_t write_va)
1455 {
1456         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1457         struct iscsi_conn *conn = isert_conn->conn;
1458         struct iscsi_cmd *cmd;
1459         struct isert_cmd *isert_cmd;
1460         int ret = -EINVAL;
1461         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1462
1463         if (conn->sess->sess_ops->SessionType &&
1464            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1465                 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1466                           " ignoring\n", opcode);
1467                 return 0;
1468         }
1469
1470         switch (opcode) {
1471         case ISCSI_OP_SCSI_CMD:
1472                 cmd = isert_allocate_cmd(conn, rx_desc);
1473                 if (!cmd)
1474                         break;
1475
1476                 isert_cmd = iscsit_priv_cmd(cmd);
1477                 isert_cmd->read_stag = read_stag;
1478                 isert_cmd->read_va = read_va;
1479                 isert_cmd->write_stag = write_stag;
1480                 isert_cmd->write_va = write_va;
1481                 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1482
1483                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1484                                         rx_desc, (unsigned char *)hdr);
1485                 break;
1486         case ISCSI_OP_NOOP_OUT:
1487                 cmd = isert_allocate_cmd(conn, rx_desc);
1488                 if (!cmd)
1489                         break;
1490
1491                 isert_cmd = iscsit_priv_cmd(cmd);
1492                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1493                                            rx_desc, (unsigned char *)hdr);
1494                 break;
1495         case ISCSI_OP_SCSI_DATA_OUT:
1496                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1497                                                 (unsigned char *)hdr);
1498                 break;
1499         case ISCSI_OP_SCSI_TMFUNC:
1500                 cmd = isert_allocate_cmd(conn, rx_desc);
1501                 if (!cmd)
1502                         break;
1503
1504                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1505                                                 (unsigned char *)hdr);
1506                 break;
1507         case ISCSI_OP_LOGOUT:
1508                 cmd = isert_allocate_cmd(conn, rx_desc);
1509                 if (!cmd)
1510                         break;
1511
1512                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1513                 break;
1514         case ISCSI_OP_TEXT:
1515                 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1516                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1517                 else
1518                         cmd = isert_allocate_cmd(conn, rx_desc);
1519
1520                 if (!cmd)
1521                         break;
1522
1523                 isert_cmd = iscsit_priv_cmd(cmd);
1524                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1525                                             rx_desc, (struct iscsi_text *)hdr);
1526                 break;
1527         default:
1528                 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1529                 dump_stack();
1530                 break;
1531         }
1532
1533         return ret;
1534 }
1535
1536 static void
1537 isert_print_wc(struct ib_wc *wc, const char *type)
1538 {
1539         if (wc->status != IB_WC_WR_FLUSH_ERR)
1540                 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1541                           ib_wc_status_msg(wc->status), wc->status,
1542                           wc->vendor_err);
1543         else
1544                 isert_dbg("%s failure: %s (%d)\n", type,
1545                           ib_wc_status_msg(wc->status), wc->status);
1546 }
1547
1548 static void
1549 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1550 {
1551         struct isert_conn *isert_conn = wc->qp->qp_context;
1552         struct ib_device *ib_dev = isert_conn->cm_id->device;
1553         struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1554         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1555         struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1556         uint64_t read_va = 0, write_va = 0;
1557         uint32_t read_stag = 0, write_stag = 0;
1558
1559         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1560                 isert_print_wc(wc, "recv");
1561                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1562                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1563                 return;
1564         }
1565
1566         ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1567                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1568
1569         isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1570                  rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1571                  (int)(wc->byte_len - ISER_HEADERS_LEN));
1572
1573         switch (iser_ctrl->flags & 0xF0) {
1574         case ISCSI_CTRL:
1575                 if (iser_ctrl->flags & ISER_RSV) {
1576                         read_stag = be32_to_cpu(iser_ctrl->read_stag);
1577                         read_va = be64_to_cpu(iser_ctrl->read_va);
1578                         isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1579                                   read_stag, (unsigned long long)read_va);
1580                 }
1581                 if (iser_ctrl->flags & ISER_WSV) {
1582                         write_stag = be32_to_cpu(iser_ctrl->write_stag);
1583                         write_va = be64_to_cpu(iser_ctrl->write_va);
1584                         isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1585                                   write_stag, (unsigned long long)write_va);
1586                 }
1587
1588                 isert_dbg("ISER ISCSI_CTRL PDU\n");
1589                 break;
1590         case ISER_HELLO:
1591                 isert_err("iSER Hello message\n");
1592                 break;
1593         default:
1594                 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1595                 break;
1596         }
1597
1598         isert_rx_opcode(isert_conn, rx_desc,
1599                         read_stag, read_va, write_stag, write_va);
1600
1601         ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1602                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1603 }
1604
1605 static void
1606 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1607 {
1608         struct isert_conn *isert_conn = wc->qp->qp_context;
1609         struct ib_device *ib_dev = isert_conn->cm_id->device;
1610
1611         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1612                 isert_print_wc(wc, "login recv");
1613                 return;
1614         }
1615
1616         ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1617                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1618
1619         isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1620
1621         if (isert_conn->conn) {
1622                 struct iscsi_login *login = isert_conn->conn->conn_login;
1623
1624                 if (login && !login->first_request)
1625                         isert_rx_login_req(isert_conn);
1626         }
1627
1628         mutex_lock(&isert_conn->mutex);
1629         complete(&isert_conn->login_req_comp);
1630         mutex_unlock(&isert_conn->mutex);
1631
1632         ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1633                                 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1634 }
1635
1636 static int
1637 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1638                    struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1639                    enum iser_ib_op_code op, struct isert_data_buf *data)
1640 {
1641         struct ib_device *ib_dev = isert_conn->cm_id->device;
1642
1643         data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1644                               DMA_TO_DEVICE : DMA_FROM_DEVICE;
1645
1646         data->len = length - offset;
1647         data->offset = offset;
1648         data->sg_off = data->offset / PAGE_SIZE;
1649
1650         data->sg = &sg[data->sg_off];
1651         data->nents = min_t(unsigned int, nents - data->sg_off,
1652                                           ISCSI_ISER_SG_TABLESIZE);
1653         data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1654                                         PAGE_SIZE);
1655
1656         data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1657                                         data->dma_dir);
1658         if (unlikely(!data->dma_nents)) {
1659                 isert_err("Cmd: unable to dma map SGs %p\n", sg);
1660                 return -EINVAL;
1661         }
1662
1663         isert_dbg("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1664                   isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1665
1666         return 0;
1667 }
1668
1669 static void
1670 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1671 {
1672         struct ib_device *ib_dev = isert_conn->cm_id->device;
1673
1674         ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1675         memset(data, 0, sizeof(*data));
1676 }
1677
1678
1679
1680 static void
1681 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1682 {
1683         isert_dbg("Cmd %p\n", isert_cmd);
1684
1685         if (isert_cmd->data.sg) {
1686                 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1687                 isert_unmap_data_buf(isert_conn, &isert_cmd->data);
1688         }
1689
1690         if (isert_cmd->rdma_wr) {
1691                 isert_dbg("Cmd %p free send_wr\n", isert_cmd);
1692                 kfree(isert_cmd->rdma_wr);
1693                 isert_cmd->rdma_wr = NULL;
1694         }
1695
1696         if (isert_cmd->ib_sge) {
1697                 isert_dbg("Cmd %p free ib_sge\n", isert_cmd);
1698                 kfree(isert_cmd->ib_sge);
1699                 isert_cmd->ib_sge = NULL;
1700         }
1701 }
1702
1703 static void
1704 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1705 {
1706         isert_dbg("Cmd %p\n", isert_cmd);
1707
1708         if (isert_cmd->fr_desc) {
1709                 isert_dbg("Cmd %p free fr_desc %p\n", isert_cmd, isert_cmd->fr_desc);
1710                 if (isert_cmd->fr_desc->ind & ISERT_PROTECTED) {
1711                         isert_unmap_data_buf(isert_conn, &isert_cmd->prot);
1712                         isert_cmd->fr_desc->ind &= ~ISERT_PROTECTED;
1713                 }
1714                 spin_lock_bh(&isert_conn->pool_lock);
1715                 list_add_tail(&isert_cmd->fr_desc->list, &isert_conn->fr_pool);
1716                 spin_unlock_bh(&isert_conn->pool_lock);
1717                 isert_cmd->fr_desc = NULL;
1718         }
1719
1720         if (isert_cmd->data.sg) {
1721                 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1722                 isert_unmap_data_buf(isert_conn, &isert_cmd->data);
1723         }
1724
1725         isert_cmd->ib_sge = NULL;
1726         isert_cmd->rdma_wr = NULL;
1727 }
1728
1729 static void
1730 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1731 {
1732         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1733         struct isert_conn *isert_conn = isert_cmd->conn;
1734         struct iscsi_conn *conn = isert_conn->conn;
1735         struct isert_device *device = isert_conn->device;
1736         struct iscsi_text_rsp *hdr;
1737
1738         isert_dbg("Cmd %p\n", isert_cmd);
1739
1740         switch (cmd->iscsi_opcode) {
1741         case ISCSI_OP_SCSI_CMD:
1742                 spin_lock_bh(&conn->cmd_lock);
1743                 if (!list_empty(&cmd->i_conn_node))
1744                         list_del_init(&cmd->i_conn_node);
1745                 spin_unlock_bh(&conn->cmd_lock);
1746
1747                 if (cmd->data_direction == DMA_TO_DEVICE) {
1748                         iscsit_stop_dataout_timer(cmd);
1749                         /*
1750                          * Check for special case during comp_err where
1751                          * WRITE_PENDING has been handed off from core,
1752                          * but requires an extra target_put_sess_cmd()
1753                          * before transport_generic_free_cmd() below.
1754                          */
1755                         if (comp_err &&
1756                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1757                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1758
1759                                 target_put_sess_cmd(se_cmd);
1760                         }
1761                 }
1762
1763                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1764                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1765                 break;
1766         case ISCSI_OP_SCSI_TMFUNC:
1767                 spin_lock_bh(&conn->cmd_lock);
1768                 if (!list_empty(&cmd->i_conn_node))
1769                         list_del_init(&cmd->i_conn_node);
1770                 spin_unlock_bh(&conn->cmd_lock);
1771
1772                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1773                 break;
1774         case ISCSI_OP_REJECT:
1775         case ISCSI_OP_NOOP_OUT:
1776         case ISCSI_OP_TEXT:
1777                 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1778                 /* If the continue bit is on, keep the command alive */
1779                 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1780                         break;
1781
1782                 spin_lock_bh(&conn->cmd_lock);
1783                 if (!list_empty(&cmd->i_conn_node))
1784                         list_del_init(&cmd->i_conn_node);
1785                 spin_unlock_bh(&conn->cmd_lock);
1786
1787                 /*
1788                  * Handle special case for REJECT when iscsi_add_reject*() has
1789                  * overwritten the original iscsi_opcode assignment, and the
1790                  * associated cmd->se_cmd needs to be released.
1791                  */
1792                 if (cmd->se_cmd.se_tfo != NULL) {
1793                         isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1794                                  cmd->iscsi_opcode);
1795                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1796                         break;
1797                 }
1798                 /*
1799                  * Fall-through
1800                  */
1801         default:
1802                 iscsit_release_cmd(cmd);
1803                 break;
1804         }
1805 }
1806
1807 static void
1808 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1809 {
1810         if (tx_desc->dma_addr != 0) {
1811                 isert_dbg("unmap single for tx_desc->dma_addr\n");
1812                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1813                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1814                 tx_desc->dma_addr = 0;
1815         }
1816 }
1817
1818 static void
1819 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1820                      struct ib_device *ib_dev, bool comp_err)
1821 {
1822         if (isert_cmd->pdu_buf_dma != 0) {
1823                 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1824                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1825                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1826                 isert_cmd->pdu_buf_dma = 0;
1827         }
1828
1829         isert_unmap_tx_desc(tx_desc, ib_dev);
1830         isert_put_cmd(isert_cmd, comp_err);
1831 }
1832
1833 static int
1834 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1835 {
1836         struct ib_mr_status mr_status;
1837         int ret;
1838
1839         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1840         if (ret) {
1841                 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1842                 goto fail_mr_status;
1843         }
1844
1845         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1846                 u64 sec_offset_err;
1847                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1848
1849                 switch (mr_status.sig_err.err_type) {
1850                 case IB_SIG_BAD_GUARD:
1851                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1852                         break;
1853                 case IB_SIG_BAD_REFTAG:
1854                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1855                         break;
1856                 case IB_SIG_BAD_APPTAG:
1857                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1858                         break;
1859                 }
1860                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1861                 do_div(sec_offset_err, block_size);
1862                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1863
1864                 isert_err("PI error found type %d at sector 0x%llx "
1865                           "expected 0x%x vs actual 0x%x\n",
1866                           mr_status.sig_err.err_type,
1867                           (unsigned long long)se_cmd->bad_sector,
1868                           mr_status.sig_err.expected,
1869                           mr_status.sig_err.actual);
1870                 ret = 1;
1871         }
1872
1873 fail_mr_status:
1874         return ret;
1875 }
1876
1877 static void
1878 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1879 {
1880         struct isert_conn *isert_conn = wc->qp->qp_context;
1881         struct isert_device *device = isert_conn->device;
1882         struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1883         struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1884         struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1885         int ret = 0;
1886
1887         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1888                 isert_print_wc(wc, "rdma write");
1889                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1890                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1891                 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1892                 return;
1893         }
1894
1895         isert_dbg("Cmd %p\n", isert_cmd);
1896
1897         if (isert_cmd->fr_desc && isert_cmd->fr_desc->ind & ISERT_PROTECTED) {
1898                 ret = isert_check_pi_status(cmd,
1899                                 isert_cmd->fr_desc->pi_ctx->sig_mr);
1900                 isert_cmd->fr_desc->ind &= ~ISERT_PROTECTED;
1901         }
1902
1903         device->unreg_rdma_mem(isert_cmd, isert_conn);
1904         isert_cmd->rdma_wr_num = 0;
1905         if (ret)
1906                 transport_send_check_condition_and_sense(cmd, cmd->pi_err, 0);
1907         else
1908                 isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1909 }
1910
1911 static void
1912 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1913 {
1914         struct isert_conn *isert_conn = wc->qp->qp_context;
1915         struct isert_device *device = isert_conn->device;
1916         struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1917         struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1918         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1919         struct se_cmd *se_cmd = &cmd->se_cmd;
1920         int ret = 0;
1921
1922         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1923                 isert_print_wc(wc, "rdma read");
1924                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1925                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1926                 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1927                 return;
1928         }
1929
1930         isert_dbg("Cmd %p\n", isert_cmd);
1931
1932         if (isert_cmd->fr_desc && isert_cmd->fr_desc->ind & ISERT_PROTECTED) {
1933                 ret = isert_check_pi_status(se_cmd,
1934                                             isert_cmd->fr_desc->pi_ctx->sig_mr);
1935                 isert_cmd->fr_desc->ind &= ~ISERT_PROTECTED;
1936         }
1937
1938         iscsit_stop_dataout_timer(cmd);
1939         device->unreg_rdma_mem(isert_cmd, isert_conn);
1940         cmd->write_data_done = isert_cmd->data.len;
1941         isert_cmd->rdma_wr_num = 0;
1942
1943         isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1944         spin_lock_bh(&cmd->istate_lock);
1945         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1946         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1947         spin_unlock_bh(&cmd->istate_lock);
1948
1949         if (ret) {
1950                 target_put_sess_cmd(se_cmd);
1951                 transport_send_check_condition_and_sense(se_cmd,
1952                                                          se_cmd->pi_err, 0);
1953         } else {
1954                 target_execute_cmd(se_cmd);
1955         }
1956 }
1957
1958 static void
1959 isert_do_control_comp(struct work_struct *work)
1960 {
1961         struct isert_cmd *isert_cmd = container_of(work,
1962                         struct isert_cmd, comp_work);
1963         struct isert_conn *isert_conn = isert_cmd->conn;
1964         struct ib_device *ib_dev = isert_conn->cm_id->device;
1965         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1966
1967         isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1968
1969         switch (cmd->i_state) {
1970         case ISTATE_SEND_TASKMGTRSP:
1971                 iscsit_tmr_post_handler(cmd, cmd->conn);
1972         case ISTATE_SEND_REJECT:   /* FALLTHRU */
1973         case ISTATE_SEND_TEXTRSP:  /* FALLTHRU */
1974                 cmd->i_state = ISTATE_SENT_STATUS;
1975                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1976                                      ib_dev, false);
1977                 break;
1978         case ISTATE_SEND_LOGOUTRSP:
1979                 iscsit_logout_post_handler(cmd, cmd->conn);
1980                 break;
1981         default:
1982                 isert_err("Unknown i_state %d\n", cmd->i_state);
1983                 dump_stack();
1984                 break;
1985         }
1986 }
1987
1988 static void
1989 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1990 {
1991         struct isert_conn *isert_conn = wc->qp->qp_context;
1992         struct ib_device *ib_dev = isert_conn->cm_id->device;
1993         struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1994
1995         if (unlikely(wc->status != IB_WC_SUCCESS)) {
1996                 isert_print_wc(wc, "login send");
1997                 if (wc->status != IB_WC_WR_FLUSH_ERR)
1998                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1999         }
2000
2001         isert_unmap_tx_desc(tx_desc, ib_dev);
2002 }
2003
2004 static void
2005 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
2006 {
2007         struct isert_conn *isert_conn = wc->qp->qp_context;
2008         struct ib_device *ib_dev = isert_conn->cm_id->device;
2009         struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
2010         struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
2011
2012         if (unlikely(wc->status != IB_WC_SUCCESS)) {
2013                 isert_print_wc(wc, "send");
2014                 if (wc->status != IB_WC_WR_FLUSH_ERR)
2015                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2016                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
2017                 return;
2018         }
2019
2020         isert_dbg("Cmd %p\n", isert_cmd);
2021
2022         switch (isert_cmd->iscsi_cmd->i_state) {
2023         case ISTATE_SEND_TASKMGTRSP:
2024         case ISTATE_SEND_LOGOUTRSP:
2025         case ISTATE_SEND_REJECT:
2026         case ISTATE_SEND_TEXTRSP:
2027                 isert_unmap_tx_desc(tx_desc, ib_dev);
2028
2029                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
2030                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
2031                 return;
2032         default:
2033                 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
2034                 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
2035                 break;
2036         }
2037 }
2038
2039 static int
2040 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2041 {
2042         struct ib_send_wr *wr_failed;
2043         int ret;
2044
2045         ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2046         if (ret) {
2047                 isert_err("ib_post_recv failed with %d\n", ret);
2048                 return ret;
2049         }
2050
2051         ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
2052                            &wr_failed);
2053         if (ret) {
2054                 isert_err("ib_post_send failed with %d\n", ret);
2055                 return ret;
2056         }
2057         return ret;
2058 }
2059
2060 static int
2061 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2062 {
2063         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2064         struct isert_conn *isert_conn = conn->context;
2065         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2066         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2067                                 &isert_cmd->tx_desc.iscsi_header;
2068
2069         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2070         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2071         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2072         /*
2073          * Attach SENSE DATA payload to iSCSI Response PDU
2074          */
2075         if (cmd->se_cmd.sense_buffer &&
2076             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2077             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2078                 struct isert_device *device = isert_conn->device;
2079                 struct ib_device *ib_dev = device->ib_device;
2080                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2081                 u32 padding, pdu_len;
2082
2083                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2084                                    cmd->sense_buffer);
2085                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2086
2087                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2088                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2089                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2090
2091                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2092                                 (void *)cmd->sense_buffer, pdu_len,
2093                                 DMA_TO_DEVICE);
2094
2095                 isert_cmd->pdu_buf_len = pdu_len;
2096                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2097                 tx_dsg->length  = pdu_len;
2098                 tx_dsg->lkey    = device->pd->local_dma_lkey;
2099                 isert_cmd->tx_desc.num_sge = 2;
2100         }
2101
2102         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2103
2104         isert_dbg("Posting SCSI Response\n");
2105
2106         return isert_post_response(isert_conn, isert_cmd);
2107 }
2108
2109 static void
2110 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2111 {
2112         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2113         struct isert_conn *isert_conn = conn->context;
2114         struct isert_device *device = isert_conn->device;
2115
2116         spin_lock_bh(&conn->cmd_lock);
2117         if (!list_empty(&cmd->i_conn_node))
2118                 list_del_init(&cmd->i_conn_node);
2119         spin_unlock_bh(&conn->cmd_lock);
2120
2121         if (cmd->data_direction == DMA_TO_DEVICE)
2122                 iscsit_stop_dataout_timer(cmd);
2123
2124         device->unreg_rdma_mem(isert_cmd, isert_conn);
2125 }
2126
2127 static enum target_prot_op
2128 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2129 {
2130         struct isert_conn *isert_conn = conn->context;
2131         struct isert_device *device = isert_conn->device;
2132
2133         if (conn->tpg->tpg_attrib.t10_pi) {
2134                 if (device->pi_capable) {
2135                         isert_info("conn %p PI offload enabled\n", isert_conn);
2136                         isert_conn->pi_support = true;
2137                         return TARGET_PROT_ALL;
2138                 }
2139         }
2140
2141         isert_info("conn %p PI offload disabled\n", isert_conn);
2142         isert_conn->pi_support = false;
2143
2144         return TARGET_PROT_NORMAL;
2145 }
2146
2147 static int
2148 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2149                 bool nopout_response)
2150 {
2151         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2152         struct isert_conn *isert_conn = conn->context;
2153         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2154
2155         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2156         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2157                                &isert_cmd->tx_desc.iscsi_header,
2158                                nopout_response);
2159         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2160         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2161
2162         isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
2163
2164         return isert_post_response(isert_conn, isert_cmd);
2165 }
2166
2167 static int
2168 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2169 {
2170         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2171         struct isert_conn *isert_conn = conn->context;
2172         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2173
2174         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2175         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2176                                 &isert_cmd->tx_desc.iscsi_header);
2177         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2178         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2179
2180         isert_dbg("conn %p Posting Logout Response\n", isert_conn);
2181
2182         return isert_post_response(isert_conn, isert_cmd);
2183 }
2184
2185 static int
2186 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2187 {
2188         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2189         struct isert_conn *isert_conn = conn->context;
2190         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2191
2192         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2193         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2194                                   &isert_cmd->tx_desc.iscsi_header);
2195         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2196         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2197
2198         isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
2199
2200         return isert_post_response(isert_conn, isert_cmd);
2201 }
2202
2203 static int
2204 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2205 {
2206         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2207         struct isert_conn *isert_conn = conn->context;
2208         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2209         struct isert_device *device = isert_conn->device;
2210         struct ib_device *ib_dev = device->ib_device;
2211         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2212         struct iscsi_reject *hdr =
2213                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2214
2215         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2216         iscsit_build_reject(cmd, conn, hdr);
2217         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2218
2219         hton24(hdr->dlength, ISCSI_HDR_LEN);
2220         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2221                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2222                         DMA_TO_DEVICE);
2223         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2224         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2225         tx_dsg->length  = ISCSI_HDR_LEN;
2226         tx_dsg->lkey    = device->pd->local_dma_lkey;
2227         isert_cmd->tx_desc.num_sge = 2;
2228
2229         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2230
2231         isert_dbg("conn %p Posting Reject\n", isert_conn);
2232
2233         return isert_post_response(isert_conn, isert_cmd);
2234 }
2235
2236 static int
2237 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2238 {
2239         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2240         struct isert_conn *isert_conn = conn->context;
2241         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2242         struct iscsi_text_rsp *hdr =
2243                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2244         u32 txt_rsp_len;
2245         int rc;
2246
2247         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2248         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2249         if (rc < 0)
2250                 return rc;
2251
2252         txt_rsp_len = rc;
2253         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2254
2255         if (txt_rsp_len) {
2256                 struct isert_device *device = isert_conn->device;
2257                 struct ib_device *ib_dev = device->ib_device;
2258                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2259                 void *txt_rsp_buf = cmd->buf_ptr;
2260
2261                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2262                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2263
2264                 isert_cmd->pdu_buf_len = txt_rsp_len;
2265                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2266                 tx_dsg->length  = txt_rsp_len;
2267                 tx_dsg->lkey    = device->pd->local_dma_lkey;
2268                 isert_cmd->tx_desc.num_sge = 2;
2269         }
2270         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2271
2272         isert_dbg("conn %p Text Response\n", isert_conn);
2273
2274         return isert_post_response(isert_conn, isert_cmd);
2275 }
2276
2277 static int
2278 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2279                     struct ib_sge *ib_sge, struct ib_rdma_wr *rdma_wr,
2280                     u32 data_left, u32 offset)
2281 {
2282         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2283         struct scatterlist *sg_start, *tmp_sg;
2284         struct isert_device *device = isert_conn->device;
2285         struct ib_device *ib_dev = device->ib_device;
2286         u32 sg_off, page_off;
2287         int i = 0, sg_nents;
2288
2289         sg_off = offset / PAGE_SIZE;
2290         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2291         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2292         page_off = offset % PAGE_SIZE;
2293
2294         rdma_wr->wr.sg_list = ib_sge;
2295         rdma_wr->wr.wr_cqe = &isert_cmd->tx_desc.tx_cqe;
2296
2297         /*
2298          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2299          */
2300         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2301                 isert_dbg("RDMA from SGL dma_addr: 0x%llx dma_len: %u, "
2302                           "page_off: %u\n",
2303                           (unsigned long long)tmp_sg->dma_address,
2304                           tmp_sg->length, page_off);
2305
2306                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2307                 ib_sge->length = min_t(u32, data_left,
2308                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2309                 ib_sge->lkey = device->pd->local_dma_lkey;
2310
2311                 isert_dbg("RDMA ib_sge: addr: 0x%llx  length: %u lkey: %x\n",
2312                           ib_sge->addr, ib_sge->length, ib_sge->lkey);
2313                 page_off = 0;
2314                 data_left -= ib_sge->length;
2315                 if (!data_left)
2316                         break;
2317                 ib_sge++;
2318                 isert_dbg("Incrementing ib_sge pointer to %p\n", ib_sge);
2319         }
2320
2321         rdma_wr->wr.num_sge = ++i;
2322         isert_dbg("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2323                   rdma_wr->wr.sg_list, rdma_wr->wr.num_sge);
2324
2325         return rdma_wr->wr.num_sge;
2326 }
2327
2328 static int
2329 isert_map_rdma(struct isert_cmd *isert_cmd, struct iscsi_conn *conn)
2330 {
2331         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2332         struct se_cmd *se_cmd = &cmd->se_cmd;
2333         struct isert_conn *isert_conn = conn->context;
2334         struct isert_data_buf *data = &isert_cmd->data;
2335         struct ib_rdma_wr *rdma_wr;
2336         struct ib_sge *ib_sge;
2337         u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2338         int ret = 0, i, ib_sge_cnt;
2339
2340         offset = isert_cmd->iser_ib_op == ISER_IB_RDMA_READ ?
2341                         cmd->write_data_done : 0;
2342         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2343                                  se_cmd->t_data_nents, se_cmd->data_length,
2344                                  offset, isert_cmd->iser_ib_op,
2345                                  &isert_cmd->data);
2346         if (ret)
2347                 return ret;
2348
2349         data_left = data->len;
2350         offset = data->offset;
2351
2352         ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2353         if (!ib_sge) {
2354                 isert_warn("Unable to allocate ib_sge\n");
2355                 ret = -ENOMEM;
2356                 goto unmap_cmd;
2357         }
2358         isert_cmd->ib_sge = ib_sge;
2359
2360         isert_cmd->rdma_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2361         isert_cmd->rdma_wr = kzalloc(sizeof(struct ib_rdma_wr) *
2362                         isert_cmd->rdma_wr_num, GFP_KERNEL);
2363         if (!isert_cmd->rdma_wr) {
2364                 isert_dbg("Unable to allocate isert_cmd->rdma_wr\n");
2365                 ret = -ENOMEM;
2366                 goto unmap_cmd;
2367         }
2368
2369         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2370
2371         for (i = 0; i < isert_cmd->rdma_wr_num; i++) {
2372                 rdma_wr = &isert_cmd->rdma_wr[i];
2373                 data_len = min(data_left, rdma_write_max);
2374
2375                 rdma_wr->wr.send_flags = 0;
2376                 if (isert_cmd->iser_ib_op == ISER_IB_RDMA_WRITE) {
2377                         isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2378
2379                         rdma_wr->wr.opcode = IB_WR_RDMA_WRITE;
2380                         rdma_wr->remote_addr = isert_cmd->read_va + offset;
2381                         rdma_wr->rkey = isert_cmd->read_stag;
2382                         if (i + 1 == isert_cmd->rdma_wr_num)
2383                                 rdma_wr->wr.next = &isert_cmd->tx_desc.send_wr;
2384                         else
2385                                 rdma_wr->wr.next = &isert_cmd->rdma_wr[i + 1].wr;
2386                 } else {
2387                         isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2388
2389                         rdma_wr->wr.opcode = IB_WR_RDMA_READ;
2390                         rdma_wr->remote_addr = isert_cmd->write_va + va_offset;
2391                         rdma_wr->rkey = isert_cmd->write_stag;
2392                         if (i + 1 == isert_cmd->rdma_wr_num)
2393                                 rdma_wr->wr.send_flags = IB_SEND_SIGNALED;
2394                         else
2395                                 rdma_wr->wr.next = &isert_cmd->rdma_wr[i + 1].wr;
2396                 }
2397
2398                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2399                                         rdma_wr, data_len, offset);
2400                 ib_sge += ib_sge_cnt;
2401
2402                 offset += data_len;
2403                 va_offset += data_len;
2404                 data_left -= data_len;
2405         }
2406
2407         return 0;
2408 unmap_cmd:
2409         isert_unmap_data_buf(isert_conn, data);
2410
2411         return ret;
2412 }
2413
2414 static inline void
2415 isert_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr)
2416 {
2417         u32 rkey;
2418
2419         memset(inv_wr, 0, sizeof(*inv_wr));
2420         inv_wr->wr_cqe = NULL;
2421         inv_wr->opcode = IB_WR_LOCAL_INV;
2422         inv_wr->ex.invalidate_rkey = mr->rkey;
2423
2424         /* Bump the key */
2425         rkey = ib_inc_rkey(mr->rkey);
2426         ib_update_fast_reg_key(mr, rkey);
2427 }
2428
2429 static int
2430 isert_fast_reg_mr(struct isert_conn *isert_conn,
2431                   struct fast_reg_descriptor *fr_desc,
2432                   struct isert_data_buf *mem,
2433                   enum isert_indicator ind,
2434                   struct ib_sge *sge)
2435 {
2436         struct isert_device *device = isert_conn->device;
2437         struct ib_device *ib_dev = device->ib_device;
2438         struct ib_mr *mr;
2439         struct ib_reg_wr reg_wr;
2440         struct ib_send_wr inv_wr, *bad_wr, *wr = NULL;
2441         int ret, n;
2442
2443         if (mem->dma_nents == 1) {
2444                 sge->lkey = device->pd->local_dma_lkey;
2445                 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2446                 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2447                 isert_dbg("sge: addr: 0x%llx  length: %u lkey: %x\n",
2448                          sge->addr, sge->length, sge->lkey);
2449                 return 0;
2450         }
2451
2452         if (ind == ISERT_DATA_KEY_VALID)
2453                 /* Registering data buffer */
2454                 mr = fr_desc->data_mr;
2455         else
2456                 /* Registering protection buffer */
2457                 mr = fr_desc->pi_ctx->prot_mr;
2458
2459         if (!(fr_desc->ind & ind)) {
2460                 isert_inv_rkey(&inv_wr, mr);
2461                 wr = &inv_wr;
2462         }
2463
2464         n = ib_map_mr_sg(mr, mem->sg, mem->nents, PAGE_SIZE);
2465         if (unlikely(n != mem->nents)) {
2466                 isert_err("failed to map mr sg (%d/%d)\n",
2467                          n, mem->nents);
2468                 return n < 0 ? n : -EINVAL;
2469         }
2470
2471         isert_dbg("Use fr_desc %p sg_nents %d offset %u\n",
2472                   fr_desc, mem->nents, mem->offset);
2473
2474         reg_wr.wr.next = NULL;
2475         reg_wr.wr.opcode = IB_WR_REG_MR;
2476         reg_wr.wr.wr_cqe = NULL;
2477         reg_wr.wr.send_flags = 0;
2478         reg_wr.wr.num_sge = 0;
2479         reg_wr.mr = mr;
2480         reg_wr.key = mr->lkey;
2481         reg_wr.access = IB_ACCESS_LOCAL_WRITE;
2482
2483         if (!wr)
2484                 wr = &reg_wr.wr;
2485         else
2486                 wr->next = &reg_wr.wr;
2487
2488         ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2489         if (ret) {
2490                 isert_err("fast registration failed, ret:%d\n", ret);
2491                 return ret;
2492         }
2493         fr_desc->ind &= ~ind;
2494
2495         sge->lkey = mr->lkey;
2496         sge->addr = mr->iova;
2497         sge->length = mr->length;
2498
2499         isert_dbg("sge: addr: 0x%llx  length: %u lkey: %x\n",
2500                   sge->addr, sge->length, sge->lkey);
2501
2502         return ret;
2503 }
2504
2505 static inline void
2506 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2507                      struct ib_sig_domain *domain)
2508 {
2509         domain->sig_type = IB_SIG_TYPE_T10_DIF;
2510         domain->sig.dif.bg_type = IB_T10DIF_CRC;
2511         domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2512         domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2513         /*
2514          * At the moment we hard code those, but if in the future
2515          * the target core would like to use it, we will take it
2516          * from se_cmd.
2517          */
2518         domain->sig.dif.apptag_check_mask = 0xffff;
2519         domain->sig.dif.app_escape = true;
2520         domain->sig.dif.ref_escape = true;
2521         if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2522             se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2523                 domain->sig.dif.ref_remap = true;
2524 };
2525
2526 static int
2527 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2528 {
2529         switch (se_cmd->prot_op) {
2530         case TARGET_PROT_DIN_INSERT:
2531         case TARGET_PROT_DOUT_STRIP:
2532                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2533                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2534                 break;
2535         case TARGET_PROT_DOUT_INSERT:
2536         case TARGET_PROT_DIN_STRIP:
2537                 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2538                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2539                 break;
2540         case TARGET_PROT_DIN_PASS:
2541         case TARGET_PROT_DOUT_PASS:
2542                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2543                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2544                 break;
2545         default:
2546                 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2547                 return -EINVAL;
2548         }
2549
2550         return 0;
2551 }
2552
2553 static inline u8
2554 isert_set_prot_checks(u8 prot_checks)
2555 {
2556         return (prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2557                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2558                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2559 }
2560
2561 static int
2562 isert_reg_sig_mr(struct isert_conn *isert_conn,
2563                  struct isert_cmd *isert_cmd,
2564                  struct fast_reg_descriptor *fr_desc)
2565 {
2566         struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd;
2567         struct ib_sig_handover_wr sig_wr;
2568         struct ib_send_wr inv_wr, *bad_wr, *wr = NULL;
2569         struct pi_context *pi_ctx = fr_desc->pi_ctx;
2570         struct ib_sig_attrs sig_attrs;
2571         int ret;
2572
2573         memset(&sig_attrs, 0, sizeof(sig_attrs));
2574         ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2575         if (ret)
2576                 goto err;
2577
2578         sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2579
2580         if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2581                 isert_inv_rkey(&inv_wr, pi_ctx->sig_mr);
2582                 wr = &inv_wr;
2583         }
2584
2585         memset(&sig_wr, 0, sizeof(sig_wr));
2586         sig_wr.wr.opcode = IB_WR_REG_SIG_MR;
2587         sig_wr.wr.wr_cqe = NULL;
2588         sig_wr.wr.sg_list = &isert_cmd->ib_sg[DATA];
2589         sig_wr.wr.num_sge = 1;
2590         sig_wr.access_flags = IB_ACCESS_LOCAL_WRITE;
2591         sig_wr.sig_attrs = &sig_attrs;
2592         sig_wr.sig_mr = pi_ctx->sig_mr;
2593         if (se_cmd->t_prot_sg)
2594                 sig_wr.prot = &isert_cmd->ib_sg[PROT];
2595
2596         if (!wr)
2597                 wr = &sig_wr.wr;
2598         else
2599                 wr->next = &sig_wr.wr;
2600
2601         ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2602         if (ret) {
2603                 isert_err("fast registration failed, ret:%d\n", ret);
2604                 goto err;
2605         }
2606         fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2607
2608         isert_cmd->ib_sg[SIG].lkey = pi_ctx->sig_mr->lkey;
2609         isert_cmd->ib_sg[SIG].addr = 0;
2610         isert_cmd->ib_sg[SIG].length = se_cmd->data_length;
2611         if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2612             se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2613                 /*
2614                  * We have protection guards on the wire
2615                  * so we need to set a larget transfer
2616                  */
2617                 isert_cmd->ib_sg[SIG].length += se_cmd->prot_length;
2618
2619         isert_dbg("sig_sge: addr: 0x%llx  length: %u lkey: %x\n",
2620                   isert_cmd->ib_sg[SIG].addr, isert_cmd->ib_sg[SIG].length,
2621                   isert_cmd->ib_sg[SIG].lkey);
2622 err:
2623         return ret;
2624 }
2625
2626 static int
2627 isert_handle_prot_cmd(struct isert_conn *isert_conn,
2628                       struct isert_cmd *isert_cmd)
2629 {
2630         struct isert_device *device = isert_conn->device;
2631         struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd;
2632         int ret;
2633
2634         if (!isert_cmd->fr_desc->pi_ctx) {
2635                 ret = isert_create_pi_ctx(isert_cmd->fr_desc,
2636                                           device->ib_device,
2637                                           device->pd);
2638                 if (ret) {
2639                         isert_err("conn %p failed to allocate pi_ctx\n",
2640                                   isert_conn);
2641                         return ret;
2642                 }
2643         }
2644
2645         if (se_cmd->t_prot_sg) {
2646                 ret = isert_map_data_buf(isert_conn, isert_cmd,
2647                                          se_cmd->t_prot_sg,
2648                                          se_cmd->t_prot_nents,
2649                                          se_cmd->prot_length,
2650                                          0,
2651                                          isert_cmd->iser_ib_op,
2652                                          &isert_cmd->prot);
2653                 if (ret) {
2654                         isert_err("conn %p failed to map protection buffer\n",
2655                                   isert_conn);
2656                         return ret;
2657                 }
2658
2659                 memset(&isert_cmd->ib_sg[PROT], 0, sizeof(isert_cmd->ib_sg[PROT]));
2660                 ret = isert_fast_reg_mr(isert_conn, isert_cmd->fr_desc,
2661                                         &isert_cmd->prot,
2662                                         ISERT_PROT_KEY_VALID,
2663                                         &isert_cmd->ib_sg[PROT]);
2664                 if (ret) {
2665                         isert_err("conn %p failed to fast reg mr\n",
2666                                   isert_conn);
2667                         goto unmap_prot_cmd;
2668                 }
2669         }
2670
2671         ret = isert_reg_sig_mr(isert_conn, isert_cmd, isert_cmd->fr_desc);
2672         if (ret) {
2673                 isert_err("conn %p failed to fast reg mr\n",
2674                           isert_conn);
2675                 goto unmap_prot_cmd;
2676         }
2677         isert_cmd->fr_desc->ind |= ISERT_PROTECTED;
2678
2679         return 0;
2680
2681 unmap_prot_cmd:
2682         if (se_cmd->t_prot_sg)
2683                 isert_unmap_data_buf(isert_conn, &isert_cmd->prot);
2684
2685         return ret;
2686 }
2687
2688 static int
2689 isert_reg_rdma(struct isert_cmd *isert_cmd, struct iscsi_conn *conn)
2690 {
2691         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2692         struct se_cmd *se_cmd = &cmd->se_cmd;
2693         struct isert_conn *isert_conn = conn->context;
2694         struct fast_reg_descriptor *fr_desc = NULL;
2695         struct ib_rdma_wr *rdma_wr;
2696         struct ib_sge *ib_sg;
2697         u32 offset;
2698         int ret = 0;
2699         unsigned long flags;
2700
2701         offset = isert_cmd->iser_ib_op == ISER_IB_RDMA_READ ?
2702                         cmd->write_data_done : 0;
2703         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2704                                  se_cmd->t_data_nents, se_cmd->data_length,
2705                                  offset, isert_cmd->iser_ib_op,
2706                                  &isert_cmd->data);
2707         if (ret)
2708                 return ret;
2709
2710         if (isert_cmd->data.dma_nents != 1 ||
2711             isert_prot_cmd(isert_conn, se_cmd)) {
2712                 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2713                 fr_desc = list_first_entry(&isert_conn->fr_pool,
2714                                            struct fast_reg_descriptor, list);
2715                 list_del(&fr_desc->list);
2716                 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2717                 isert_cmd->fr_desc = fr_desc;
2718         }
2719
2720         ret = isert_fast_reg_mr(isert_conn, fr_desc, &isert_cmd->data,
2721                                 ISERT_DATA_KEY_VALID, &isert_cmd->ib_sg[DATA]);
2722         if (ret)
2723                 goto unmap_cmd;
2724
2725         if (isert_prot_cmd(isert_conn, se_cmd)) {
2726                 ret = isert_handle_prot_cmd(isert_conn, isert_cmd);
2727                 if (ret)
2728                         goto unmap_cmd;
2729
2730                 ib_sg = &isert_cmd->ib_sg[SIG];
2731         } else {
2732                 ib_sg = &isert_cmd->ib_sg[DATA];
2733         }
2734
2735         memcpy(&isert_cmd->s_ib_sge, ib_sg, sizeof(*ib_sg));
2736         isert_cmd->ib_sge = &isert_cmd->s_ib_sge;
2737         isert_cmd->rdma_wr_num = 1;
2738         memset(&isert_cmd->s_rdma_wr, 0, sizeof(isert_cmd->s_rdma_wr));
2739         isert_cmd->rdma_wr = &isert_cmd->s_rdma_wr;
2740
2741         rdma_wr = &isert_cmd->s_rdma_wr;
2742         rdma_wr->wr.sg_list = &isert_cmd->s_ib_sge;
2743         rdma_wr->wr.num_sge = 1;
2744         rdma_wr->wr.wr_cqe = &isert_cmd->tx_desc.tx_cqe;
2745         if (isert_cmd->iser_ib_op == ISER_IB_RDMA_WRITE) {
2746                 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2747
2748                 rdma_wr->wr.opcode = IB_WR_RDMA_WRITE;
2749                 rdma_wr->remote_addr = isert_cmd->read_va;
2750                 rdma_wr->rkey = isert_cmd->read_stag;
2751                 rdma_wr->wr.send_flags = !isert_prot_cmd(isert_conn, se_cmd) ?
2752                                       0 : IB_SEND_SIGNALED;
2753         } else {
2754                 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2755
2756                 rdma_wr->wr.opcode = IB_WR_RDMA_READ;
2757                 rdma_wr->remote_addr = isert_cmd->write_va;
2758                 rdma_wr->rkey = isert_cmd->write_stag;
2759                 rdma_wr->wr.send_flags = IB_SEND_SIGNALED;
2760         }
2761
2762         return 0;
2763
2764 unmap_cmd:
2765         if (fr_desc) {
2766                 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2767                 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
2768                 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2769         }
2770         isert_unmap_data_buf(isert_conn, &isert_cmd->data);
2771
2772         return ret;
2773 }
2774
2775 static int
2776 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2777 {
2778         struct se_cmd *se_cmd = &cmd->se_cmd;
2779         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2780         struct isert_conn *isert_conn = conn->context;
2781         struct isert_device *device = isert_conn->device;
2782         struct ib_send_wr *wr_failed;
2783         int rc;
2784
2785         isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2786                  isert_cmd, se_cmd->data_length);
2787
2788         isert_cmd->iser_ib_op = ISER_IB_RDMA_WRITE;
2789         rc = device->reg_rdma_mem(isert_cmd, conn);
2790         if (rc) {
2791                 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2792                 return rc;
2793         }
2794
2795         if (!isert_prot_cmd(isert_conn, se_cmd)) {
2796                 /*
2797                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2798                  */
2799                 isert_create_send_desc(isert_conn, isert_cmd,
2800                                        &isert_cmd->tx_desc);
2801                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2802                                      &isert_cmd->tx_desc.iscsi_header);
2803                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2804                 isert_init_send_wr(isert_conn, isert_cmd,
2805                                    &isert_cmd->tx_desc.send_wr);
2806                 isert_cmd->s_rdma_wr.wr.next = &isert_cmd->tx_desc.send_wr;
2807                 isert_cmd->rdma_wr_num += 1;
2808
2809                 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2810                 if (rc) {
2811                         isert_err("ib_post_recv failed with %d\n", rc);
2812                         return rc;
2813                 }
2814         }
2815
2816         rc = ib_post_send(isert_conn->qp, &isert_cmd->rdma_wr->wr, &wr_failed);
2817         if (rc)
2818                 isert_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2819
2820         if (!isert_prot_cmd(isert_conn, se_cmd))
2821                 isert_dbg("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2822                          "READ\n", isert_cmd);
2823         else
2824                 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2825                          isert_cmd);
2826
2827         return 1;
2828 }
2829
2830 static int
2831 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2832 {
2833         struct se_cmd *se_cmd = &cmd->se_cmd;
2834         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2835         struct isert_conn *isert_conn = conn->context;
2836         struct isert_device *device = isert_conn->device;
2837         struct ib_send_wr *wr_failed;
2838         int rc;
2839
2840         isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2841                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2842         isert_cmd->iser_ib_op = ISER_IB_RDMA_READ;
2843         rc = device->reg_rdma_mem(isert_cmd, conn);
2844         if (rc) {
2845                 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2846                 return rc;
2847         }
2848
2849         rc = ib_post_send(isert_conn->qp, &isert_cmd->rdma_wr->wr, &wr_failed);
2850         if (rc)
2851                 isert_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2852
2853         isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2854                  isert_cmd);
2855
2856         return 0;
2857 }
2858
2859 static int
2860 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2861 {
2862         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2863         int ret = 0;
2864
2865         switch (state) {
2866         case ISTATE_REMOVE:
2867                 spin_lock_bh(&conn->cmd_lock);
2868                 list_del_init(&cmd->i_conn_node);
2869                 spin_unlock_bh(&conn->cmd_lock);
2870                 isert_put_cmd(isert_cmd, true);
2871                 break;
2872         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2873                 ret = isert_put_nopin(cmd, conn, false);
2874                 break;
2875         default:
2876                 isert_err("Unknown immediate state: 0x%02x\n", state);
2877                 ret = -EINVAL;
2878                 break;
2879         }
2880
2881         return ret;
2882 }
2883
2884 static int
2885 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2886 {
2887         struct isert_conn *isert_conn = conn->context;
2888         int ret;
2889
2890         switch (state) {
2891         case ISTATE_SEND_LOGOUTRSP:
2892                 ret = isert_put_logout_rsp(cmd, conn);
2893                 if (!ret)
2894                         isert_conn->logout_posted = true;
2895                 break;
2896         case ISTATE_SEND_NOPIN:
2897                 ret = isert_put_nopin(cmd, conn, true);
2898                 break;
2899         case ISTATE_SEND_TASKMGTRSP:
2900                 ret = isert_put_tm_rsp(cmd, conn);
2901                 break;
2902         case ISTATE_SEND_REJECT:
2903                 ret = isert_put_reject(cmd, conn);
2904                 break;
2905         case ISTATE_SEND_TEXTRSP:
2906                 ret = isert_put_text_rsp(cmd, conn);
2907                 break;
2908         case ISTATE_SEND_STATUS:
2909                 /*
2910                  * Special case for sending non GOOD SCSI status from TX thread
2911                  * context during pre se_cmd excecution failure.
2912                  */
2913                 ret = isert_put_response(conn, cmd);
2914                 break;
2915         default:
2916                 isert_err("Unknown response state: 0x%02x\n", state);
2917                 ret = -EINVAL;
2918                 break;
2919         }
2920
2921         return ret;
2922 }
2923
2924 struct rdma_cm_id *
2925 isert_setup_id(struct isert_np *isert_np)
2926 {
2927         struct iscsi_np *np = isert_np->np;
2928         struct rdma_cm_id *id;
2929         struct sockaddr *sa;
2930         int ret;
2931
2932         sa = (struct sockaddr *)&np->np_sockaddr;
2933         isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2934
2935         id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2936                             RDMA_PS_TCP, IB_QPT_RC);
2937         if (IS_ERR(id)) {
2938                 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2939                 ret = PTR_ERR(id);
2940                 goto out;
2941         }
2942         isert_dbg("id %p context %p\n", id, id->context);
2943
2944         ret = rdma_bind_addr(id, sa);
2945         if (ret) {
2946                 isert_err("rdma_bind_addr() failed: %d\n", ret);
2947                 goto out_id;
2948         }
2949
2950         ret = rdma_listen(id, 0);
2951         if (ret) {
2952                 isert_err("rdma_listen() failed: %d\n", ret);
2953                 goto out_id;
2954         }
2955
2956         return id;
2957 out_id:
2958         rdma_destroy_id(id);
2959 out:
2960         return ERR_PTR(ret);
2961 }
2962
2963 static int
2964 isert_setup_np(struct iscsi_np *np,
2965                struct sockaddr_storage *ksockaddr)
2966 {
2967         struct isert_np *isert_np;
2968         struct rdma_cm_id *isert_lid;
2969         int ret;
2970
2971         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2972         if (!isert_np) {
2973                 isert_err("Unable to allocate struct isert_np\n");
2974                 return -ENOMEM;
2975         }
2976         sema_init(&isert_np->sem, 0);
2977         mutex_init(&isert_np->mutex);
2978         INIT_LIST_HEAD(&isert_np->accepted);
2979         INIT_LIST_HEAD(&isert_np->pending);
2980         isert_np->np = np;
2981
2982         /*
2983          * Setup the np->np_sockaddr from the passed sockaddr setup
2984          * in iscsi_target_configfs.c code..
2985          */
2986         memcpy(&np->np_sockaddr, ksockaddr,
2987                sizeof(struct sockaddr_storage));
2988
2989         isert_lid = isert_setup_id(isert_np);
2990         if (IS_ERR(isert_lid)) {
2991                 ret = PTR_ERR(isert_lid);
2992                 goto out;
2993         }
2994
2995         isert_np->cm_id = isert_lid;
2996         np->np_context = isert_np;
2997
2998         return 0;
2999
3000 out:
3001         kfree(isert_np);
3002
3003         return ret;
3004 }
3005
3006 static int
3007 isert_rdma_accept(struct isert_conn *isert_conn)
3008 {
3009         struct rdma_cm_id *cm_id = isert_conn->cm_id;
3010         struct rdma_conn_param cp;
3011         int ret;
3012         struct iser_cm_hdr rsp_hdr;
3013
3014         memset(&cp, 0, sizeof(struct rdma_conn_param));
3015         cp.initiator_depth = isert_conn->initiator_depth;
3016         cp.retry_count = 7;
3017         cp.rnr_retry_count = 7;
3018
3019         memset(&rsp_hdr, 0, sizeof(rsp_hdr));
3020         rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
3021         if (!isert_conn->snd_w_inv)
3022                 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
3023         cp.private_data = (void *)&rsp_hdr;
3024         cp.private_data_len = sizeof(rsp_hdr);
3025
3026         ret = rdma_accept(cm_id, &cp);
3027         if (ret) {
3028                 isert_err("rdma_accept() failed with: %d\n", ret);
3029                 return ret;
3030         }
3031
3032         return 0;
3033 }
3034
3035 static int
3036 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3037 {
3038         struct isert_conn *isert_conn = conn->context;
3039         int ret;
3040
3041         isert_info("before login_req comp conn: %p\n", isert_conn);
3042         ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
3043         if (ret) {
3044                 isert_err("isert_conn %p interrupted before got login req\n",
3045                           isert_conn);
3046                 return ret;
3047         }
3048         reinit_completion(&isert_conn->login_req_comp);
3049
3050         /*
3051          * For login requests after the first PDU, isert_rx_login_req() will
3052          * kick schedule_delayed_work(&conn->login_work) as the packet is
3053          * received, which turns this callback from iscsi_target_do_login_rx()
3054          * into a NOP.
3055          */
3056         if (!login->first_request)
3057                 return 0;
3058
3059         isert_rx_login_req(isert_conn);
3060
3061         isert_info("before login_comp conn: %p\n", conn);
3062         ret = wait_for_completion_interruptible(&isert_conn->login_comp);
3063         if (ret)
3064                 return ret;
3065
3066         isert_info("processing login->req: %p\n", login->req);
3067
3068         return 0;
3069 }
3070
3071 static void
3072 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3073                     struct isert_conn *isert_conn)
3074 {
3075         struct rdma_cm_id *cm_id = isert_conn->cm_id;
3076         struct rdma_route *cm_route = &cm_id->route;
3077
3078         conn->login_family = np->np_sockaddr.ss_family;
3079
3080         conn->login_sockaddr = cm_route->addr.dst_addr;
3081         conn->local_sockaddr = cm_route->addr.src_addr;
3082 }
3083
3084 static int
3085 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3086 {
3087         struct isert_np *isert_np = np->np_context;
3088         struct isert_conn *isert_conn;
3089         int ret;
3090
3091 accept_wait:
3092         ret = down_interruptible(&isert_np->sem);
3093         if (ret)
3094                 return -ENODEV;
3095
3096         spin_lock_bh(&np->np_thread_lock);
3097         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3098                 spin_unlock_bh(&np->np_thread_lock);
3099                 isert_dbg("np_thread_state %d\n",
3100                          np->np_thread_state);
3101                 /**
3102                  * No point in stalling here when np_thread
3103                  * is in state RESET/SHUTDOWN/EXIT - bail
3104                  **/
3105                 return -ENODEV;
3106         }
3107         spin_unlock_bh(&np->np_thread_lock);
3108
3109         mutex_lock(&isert_np->mutex);
3110         if (list_empty(&isert_np->pending)) {
3111                 mutex_unlock(&isert_np->mutex);
3112                 goto accept_wait;
3113         }
3114         isert_conn = list_first_entry(&isert_np->pending,
3115                         struct isert_conn, node);
3116         list_del_init(&isert_conn->node);
3117         mutex_unlock(&isert_np->mutex);
3118
3119         conn->context = isert_conn;
3120         isert_conn->conn = conn;
3121         isert_conn->state = ISER_CONN_BOUND;
3122
3123         isert_set_conn_info(np, conn, isert_conn);
3124
3125         isert_dbg("Processing isert_conn: %p\n", isert_conn);
3126
3127         return 0;
3128 }
3129
3130 static void
3131 isert_free_np(struct iscsi_np *np)
3132 {
3133         struct isert_np *isert_np = np->np_context;
3134         struct isert_conn *isert_conn, *n;
3135
3136         if (isert_np->cm_id)
3137                 rdma_destroy_id(isert_np->cm_id);
3138
3139         /*
3140          * FIXME: At this point we don't have a good way to insure
3141          * that at this point we don't have hanging connections that
3142          * completed RDMA establishment but didn't start iscsi login
3143          * process. So work-around this by cleaning up what ever piled
3144          * up in accepted and pending lists.
3145          */
3146         mutex_lock(&isert_np->mutex);
3147         if (!list_empty(&isert_np->pending)) {
3148                 isert_info("Still have isert pending connections\n");
3149                 list_for_each_entry_safe(isert_conn, n,
3150                                          &isert_np->pending,
3151                                          node) {
3152                         isert_info("cleaning isert_conn %p state (%d)\n",
3153                                    isert_conn, isert_conn->state);
3154                         isert_connect_release(isert_conn);
3155                 }
3156         }
3157
3158         if (!list_empty(&isert_np->accepted)) {
3159                 isert_info("Still have isert accepted connections\n");
3160                 list_for_each_entry_safe(isert_conn, n,
3161                                          &isert_np->accepted,
3162                                          node) {
3163                         isert_info("cleaning isert_conn %p state (%d)\n",
3164                                    isert_conn, isert_conn->state);
3165                         isert_connect_release(isert_conn);
3166                 }
3167         }
3168         mutex_unlock(&isert_np->mutex);
3169
3170         np->np_context = NULL;
3171         kfree(isert_np);
3172 }
3173
3174 static void isert_release_work(struct work_struct *work)
3175 {
3176         struct isert_conn *isert_conn = container_of(work,
3177                                                      struct isert_conn,
3178                                                      release_work);
3179
3180         isert_info("Starting release conn %p\n", isert_conn);
3181
3182         mutex_lock(&isert_conn->mutex);
3183         isert_conn->state = ISER_CONN_DOWN;
3184         mutex_unlock(&isert_conn->mutex);
3185
3186         isert_info("Destroying conn %p\n", isert_conn);
3187         isert_put_conn(isert_conn);
3188 }
3189
3190 static void
3191 isert_wait4logout(struct isert_conn *isert_conn)
3192 {
3193         struct iscsi_conn *conn = isert_conn->conn;
3194
3195         isert_info("conn %p\n", isert_conn);
3196
3197         if (isert_conn->logout_posted) {
3198                 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
3199                 wait_for_completion_timeout(&conn->conn_logout_comp,
3200                                             SECONDS_FOR_LOGOUT_COMP * HZ);
3201         }
3202 }
3203
3204 static void
3205 isert_wait4cmds(struct iscsi_conn *conn)
3206 {
3207         isert_info("iscsi_conn %p\n", conn);
3208
3209         if (conn->sess) {
3210                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
3211                 target_wait_for_sess_cmds(conn->sess->se_sess);
3212         }
3213 }
3214
3215 /**
3216  * isert_put_unsol_pending_cmds() - Drop commands waiting for
3217  *     unsolicitate dataout
3218  * @conn:    iscsi connection
3219  *
3220  * We might still have commands that are waiting for unsolicited
3221  * dataouts messages. We must put the extra reference on those
3222  * before blocking on the target_wait_for_session_cmds
3223  */
3224 static void
3225 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
3226 {
3227         struct iscsi_cmd *cmd, *tmp;
3228         static LIST_HEAD(drop_cmd_list);
3229
3230         spin_lock_bh(&conn->cmd_lock);
3231         list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
3232                 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
3233                     (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
3234                     (cmd->write_data_done < cmd->se_cmd.data_length))
3235                         list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
3236         }
3237         spin_unlock_bh(&conn->cmd_lock);
3238
3239         list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
3240                 list_del_init(&cmd->i_conn_node);
3241                 if (cmd->i_state != ISTATE_REMOVE) {
3242                         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
3243
3244                         isert_info("conn %p dropping cmd %p\n", conn, cmd);
3245                         isert_put_cmd(isert_cmd, true);
3246                 }
3247         }
3248 }
3249
3250 static void isert_wait_conn(struct iscsi_conn *conn)
3251 {
3252         struct isert_conn *isert_conn = conn->context;
3253
3254         isert_info("Starting conn %p\n", isert_conn);
3255
3256         mutex_lock(&isert_conn->mutex);
3257         isert_conn_terminate(isert_conn);
3258         mutex_unlock(&isert_conn->mutex);
3259
3260         ib_drain_qp(isert_conn->qp);
3261         isert_put_unsol_pending_cmds(conn);
3262         isert_wait4cmds(conn);
3263         isert_wait4logout(isert_conn);
3264
3265         queue_work(isert_release_wq, &isert_conn->release_work);
3266 }
3267
3268 static void isert_free_conn(struct iscsi_conn *conn)
3269 {
3270         struct isert_conn *isert_conn = conn->context;
3271
3272         ib_drain_qp(isert_conn->qp);
3273         isert_put_conn(isert_conn);
3274 }
3275
3276 static struct iscsit_transport iser_target_transport = {
3277         .name                   = "IB/iSER",
3278         .transport_type         = ISCSI_INFINIBAND,
3279         .priv_size              = sizeof(struct isert_cmd),
3280         .owner                  = THIS_MODULE,
3281         .iscsit_setup_np        = isert_setup_np,
3282         .iscsit_accept_np       = isert_accept_np,
3283         .iscsit_free_np         = isert_free_np,
3284         .iscsit_wait_conn       = isert_wait_conn,
3285         .iscsit_free_conn       = isert_free_conn,
3286         .iscsit_get_login_rx    = isert_get_login_rx,
3287         .iscsit_put_login_tx    = isert_put_login_tx,
3288         .iscsit_immediate_queue = isert_immediate_queue,
3289         .iscsit_response_queue  = isert_response_queue,
3290         .iscsit_get_dataout     = isert_get_dataout,
3291         .iscsit_queue_data_in   = isert_put_datain,
3292         .iscsit_queue_status    = isert_put_response,
3293         .iscsit_aborted_task    = isert_aborted_task,
3294         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3295 };
3296
3297 static int __init isert_init(void)
3298 {
3299         int ret;
3300
3301         isert_comp_wq = alloc_workqueue("isert_comp_wq",
3302                                         WQ_UNBOUND | WQ_HIGHPRI, 0);
3303         if (!isert_comp_wq) {
3304                 isert_err("Unable to allocate isert_comp_wq\n");
3305                 ret = -ENOMEM;
3306                 return -ENOMEM;
3307         }
3308
3309         isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
3310                                         WQ_UNBOUND_MAX_ACTIVE);
3311         if (!isert_release_wq) {
3312                 isert_err("Unable to allocate isert_release_wq\n");
3313                 ret = -ENOMEM;
3314                 goto destroy_comp_wq;
3315         }
3316
3317         iscsit_register_transport(&iser_target_transport);
3318         isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
3319
3320         return 0;
3321
3322 destroy_comp_wq:
3323         destroy_workqueue(isert_comp_wq);
3324
3325         return ret;
3326 }
3327
3328 static void __exit isert_exit(void)
3329 {
3330         flush_scheduled_work();
3331         destroy_workqueue(isert_release_wq);
3332         destroy_workqueue(isert_comp_wq);
3333         iscsit_unregister_transport(&iser_target_transport);
3334         isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
3335 }
3336
3337 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3338 MODULE_VERSION("1.0");
3339 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3340 MODULE_LICENSE("GPL");
3341
3342 module_init(isert_init);
3343 module_exit(isert_exit);