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 <linux/llist.h>
  26 #include <rdma/ib_verbs.h>
  27 #include <rdma/rdma_cm.h>
  28 #include <target/target_core_base.h>
  29 #include <target/target_core_fabric.h>
  30 #include <target/iscsi/iscsi_transport.h>
  31
  32 #include "isert_proto.h"
  33 #include "ib_isert.h"
  34
  35 #define ISERT_MAX_CONN          8
  36 #define ISER_MAX_RX_CQ_LEN      (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
  37 #define ISER_MAX_TX_CQ_LEN      (ISERT_QP_MAX_REQ_DTOS  * ISERT_MAX_CONN)
  38
  39 static DEFINE_MUTEX(device_list_mutex);
  40 static LIST_HEAD(device_list);
  41 static struct workqueue_struct *isert_rx_wq;
  42 static struct workqueue_struct *isert_comp_wq;
  43
  44 static void
  45 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  46 static int
  47 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  48                struct isert_rdma_wr *wr);
  49 static void
  50 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  51 static int
  52 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  53                struct isert_rdma_wr *wr);
  54 static int
  55 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
  56
  57 static void
  58 isert_qp_event_callback(struct ib_event *e, void *context)
  59 {
  60         struct isert_conn *isert_conn = (struct isert_conn *)context;
  61
  62         pr_err("isert_qp_event_callback event: %d\n", e->event);
  63         switch (e->event) {
  64         case IB_EVENT_COMM_EST:
  65                 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
  66                 break;
  67         case IB_EVENT_QP_LAST_WQE_REACHED:
  68                 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
  69                 break;
  70         default:
  71                 break;
  72         }
  73 }
  74
  75 static int
  76 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
  77 {
  78         int ret;
  79
  80         ret = ib_query_device(ib_dev, devattr);
  81         if (ret) {
  82                 pr_err("ib_query_device() failed: %d\n", ret);
  83                 return ret;
  84         }
  85         pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
  86         pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
  87
  88         return 0;
  89 }
  90
  91 static int
  92 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id,
  93                     u8 protection)
  94 {
  95         struct isert_device *device = isert_conn->conn_device;
  96         struct ib_qp_init_attr attr;
  97         int ret, index, min_index = 0;
  98
  99         mutex_lock(&device_list_mutex);
 100         for (index = 0; index < device->cqs_used; index++)
 101                 if (device->cq_active_qps[index] <
 102                     device->cq_active_qps[min_index])
 103                         min_index = index;
 104         device->cq_active_qps[min_index]++;
 105         pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
 106         mutex_unlock(&device_list_mutex);
 107
 108         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 109         attr.event_handler = isert_qp_event_callback;
 110         attr.qp_context = isert_conn;
 111         attr.send_cq = device->dev_tx_cq[min_index];
 112         attr.recv_cq = device->dev_rx_cq[min_index];
 113         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
 114         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
 115         /*
 116          * FIXME: Use devattr.max_sge - 2 for max_send_sge as
 117          * work-around for RDMA_READ..
 118          */
 119         attr.cap.max_send_sge = device->dev_attr.max_sge - 2;
 120         isert_conn->max_sge = attr.cap.max_send_sge;
 121
 122         attr.cap.max_recv_sge = 1;
 123         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 124         attr.qp_type = IB_QPT_RC;
 125         if (protection)
 126                 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
 127
 128         pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
 129                  cma_id->device);
 130         pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
 131                  isert_conn->conn_pd->device);
 132
 133         ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
 134         if (ret) {
 135                 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
 136                 return ret;
 137         }
 138         isert_conn->conn_qp = cma_id->qp;
 139         pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
 140
 141         return 0;
 142 }
 143
 144 static void
 145 isert_cq_event_callback(struct ib_event *e, void *context)
 146 {
 147         pr_debug("isert_cq_event_callback event: %d\n", e->event);
 148 }
 149
 150 static int
 151 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 152 {
 153         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 154         struct iser_rx_desc *rx_desc;
 155         struct ib_sge *rx_sg;
 156         u64 dma_addr;
 157         int i, j;
 158
 159         isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 160                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 161         if (!isert_conn->conn_rx_descs)
 162                 goto fail;
 163
 164         rx_desc = isert_conn->conn_rx_descs;
 165
 166         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 167                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 168                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 169                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 170                         goto dma_map_fail;
 171
 172                 rx_desc->dma_addr = dma_addr;
 173
 174                 rx_sg = &rx_desc->rx_sg;
 175                 rx_sg->addr = rx_desc->dma_addr;
 176                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 177                 rx_sg->lkey = isert_conn->conn_mr->lkey;
 178         }
 179
 180         isert_conn->conn_rx_desc_head = 0;
 181         return 0;
 182
 183 dma_map_fail:
 184         rx_desc = isert_conn->conn_rx_descs;
 185         for (j = 0; j < i; j++, rx_desc++) {
 186                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 187                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 188         }
 189         kfree(isert_conn->conn_rx_descs);
 190         isert_conn->conn_rx_descs = NULL;
 191 fail:
 192         return -ENOMEM;
 193 }
 194
 195 static void
 196 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 197 {
 198         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 199         struct iser_rx_desc *rx_desc;
 200         int i;
 201
 202         if (!isert_conn->conn_rx_descs)
 203                 return;
 204
 205         rx_desc = isert_conn->conn_rx_descs;
 206         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 207                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 208                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 209         }
 210
 211         kfree(isert_conn->conn_rx_descs);
 212         isert_conn->conn_rx_descs = NULL;
 213 }
 214
 215 static void isert_cq_tx_work(struct work_struct *);
 216 static void isert_cq_tx_callback(struct ib_cq *, void *);
 217 static void isert_cq_rx_work(struct work_struct *);
 218 static void isert_cq_rx_callback(struct ib_cq *, void *);
 219
 220 static int
 221 isert_create_device_ib_res(struct isert_device *device)
 222 {
 223         struct ib_device *ib_dev = device->ib_device;
 224         struct isert_cq_desc *cq_desc;
 225         struct ib_device_attr *dev_attr;
 226         int ret = 0, i, j;
 227
 228         dev_attr = &device->dev_attr;
 229         ret = isert_query_device(ib_dev, dev_attr);
 230         if (ret)
 231                 return ret;
 232
 233         /* asign function handlers */
 234         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
 235                 device->use_fastreg = 1;
 236                 device->reg_rdma_mem = isert_reg_rdma;
 237                 device->unreg_rdma_mem = isert_unreg_rdma;
 238         } else {
 239                 device->use_fastreg = 0;
 240                 device->reg_rdma_mem = isert_map_rdma;
 241                 device->unreg_rdma_mem = isert_unmap_cmd;
 242         }
 243
 244         /* Check signature cap */
 245         device->pi_capable = dev_attr->device_cap_flags &
 246                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 247
 248         device->cqs_used = min_t(int, num_online_cpus(),
 249                                  device->ib_device->num_comp_vectors);
 250         device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
 251         pr_debug("Using %d CQs, device %s supports %d vectors support "
 252                  "Fast registration %d pi_capable %d\n",
 253                  device->cqs_used, device->ib_device->name,
 254                  device->ib_device->num_comp_vectors, device->use_fastreg,
 255                  device->pi_capable);
 256         device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
 257                                 device->cqs_used, GFP_KERNEL);
 258         if (!device->cq_desc) {
 259                 pr_err("Unable to allocate device->cq_desc\n");
 260                 return -ENOMEM;
 261         }
 262         cq_desc = device->cq_desc;
 263
 264         for (i = 0; i < device->cqs_used; i++) {
 265                 cq_desc[i].device = device;
 266                 cq_desc[i].cq_index = i;
 267
 268                 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
 269                 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
 270                                                 isert_cq_rx_callback,
 271                                                 isert_cq_event_callback,
 272                                                 (void *)&cq_desc[i],
 273                                                 ISER_MAX_RX_CQ_LEN, i);
 274                 if (IS_ERR(device->dev_rx_cq[i])) {
 275                         ret = PTR_ERR(device->dev_rx_cq[i]);
 276                         device->dev_rx_cq[i] = NULL;
 277                         goto out_cq;
 278                 }
 279
 280                 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
 281                 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
 282                                                 isert_cq_tx_callback,
 283                                                 isert_cq_event_callback,
 284                                                 (void *)&cq_desc[i],
 285                                                 ISER_MAX_TX_CQ_LEN, i);
 286                 if (IS_ERR(device->dev_tx_cq[i])) {
 287                         ret = PTR_ERR(device->dev_tx_cq[i]);
 288                         device->dev_tx_cq[i] = NULL;
 289                         goto out_cq;
 290                 }
 291
 292                 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
 293                 if (ret)
 294                         goto out_cq;
 295
 296                 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
 297                 if (ret)
 298                         goto out_cq;
 299         }
 300
 301         return 0;
 302
 303 out_cq:
 304         for (j = 0; j < i; j++) {
 305                 cq_desc = &device->cq_desc[j];
 306
 307                 if (device->dev_rx_cq[j]) {
 308                         cancel_work_sync(&cq_desc->cq_rx_work);
 309                         ib_destroy_cq(device->dev_rx_cq[j]);
 310                 }
 311                 if (device->dev_tx_cq[j]) {
 312                         cancel_work_sync(&cq_desc->cq_tx_work);
 313                         ib_destroy_cq(device->dev_tx_cq[j]);
 314                 }
 315         }
 316         kfree(device->cq_desc);
 317
 318         return ret;
 319 }
 320
 321 static void
 322 isert_free_device_ib_res(struct isert_device *device)
 323 {
 324         struct isert_cq_desc *cq_desc;
 325         int i;
 326
 327         for (i = 0; i < device->cqs_used; i++) {
 328                 cq_desc = &device->cq_desc[i];
 329
 330                 cancel_work_sync(&cq_desc->cq_rx_work);
 331                 cancel_work_sync(&cq_desc->cq_tx_work);
 332                 ib_destroy_cq(device->dev_rx_cq[i]);
 333                 ib_destroy_cq(device->dev_tx_cq[i]);
 334                 device->dev_rx_cq[i] = NULL;
 335                 device->dev_tx_cq[i] = NULL;
 336         }
 337
 338         kfree(device->cq_desc);
 339 }
 340
 341 static void
 342 isert_device_try_release(struct isert_device *device)
 343 {
 344         mutex_lock(&device_list_mutex);
 345         device->refcount--;
 346         if (!device->refcount) {
 347                 isert_free_device_ib_res(device);
 348                 list_del(&device->dev_node);
 349                 kfree(device);
 350         }
 351         mutex_unlock(&device_list_mutex);
 352 }
 353
 354 static struct isert_device *
 355 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
 356 {
 357         struct isert_device *device;
 358         int ret;
 359
 360         mutex_lock(&device_list_mutex);
 361         list_for_each_entry(device, &device_list, dev_node) {
 362                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 363                         device->refcount++;
 364                         mutex_unlock(&device_list_mutex);
 365                         return device;
 366                 }
 367         }
 368
 369         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 370         if (!device) {
 371                 mutex_unlock(&device_list_mutex);
 372                 return ERR_PTR(-ENOMEM);
 373         }
 374
 375         INIT_LIST_HEAD(&device->dev_node);
 376
 377         device->ib_device = cma_id->device;
 378         ret = isert_create_device_ib_res(device);
 379         if (ret) {
 380                 kfree(device);
 381                 mutex_unlock(&device_list_mutex);
 382                 return ERR_PTR(ret);
 383         }
 384
 385         device->refcount++;
 386         list_add_tail(&device->dev_node, &device_list);
 387         mutex_unlock(&device_list_mutex);
 388
 389         return device;
 390 }
 391
 392 static void
 393 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
 394 {
 395         struct fast_reg_descriptor *fr_desc, *tmp;
 396         int i = 0;
 397
 398         if (list_empty(&isert_conn->conn_fr_pool))
 399                 return;
 400
 401         pr_debug("Freeing conn %p fastreg pool", isert_conn);
 402
 403         list_for_each_entry_safe(fr_desc, tmp,
 404                                  &isert_conn->conn_fr_pool, list) {
 405                 list_del(&fr_desc->list);
 406                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 407                 ib_dereg_mr(fr_desc->data_mr);
 408                 if (fr_desc->pi_ctx) {
 409                         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 410                         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 411                         ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
 412                         kfree(fr_desc->pi_ctx);
 413                 }
 414                 kfree(fr_desc);
 415                 ++i;
 416         }
 417
 418         if (i < isert_conn->conn_fr_pool_size)
 419                 pr_warn("Pool still has %d regions registered\n",
 420                         isert_conn->conn_fr_pool_size - i);
 421 }
 422
 423 static int
 424 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
 425                      struct fast_reg_descriptor *fr_desc, u8 protection)
 426 {
 427         int ret;
 428
 429         fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
 430                                                          ISCSI_ISER_SG_TABLESIZE);
 431         if (IS_ERR(fr_desc->data_frpl)) {
 432                 pr_err("Failed to allocate data frpl err=%ld\n",
 433                        PTR_ERR(fr_desc->data_frpl));
 434                 return PTR_ERR(fr_desc->data_frpl);
 435         }
 436
 437         fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 438         if (IS_ERR(fr_desc->data_mr)) {
 439                 pr_err("Failed to allocate data frmr err=%ld\n",
 440                        PTR_ERR(fr_desc->data_mr));
 441                 ret = PTR_ERR(fr_desc->data_mr);
 442                 goto err_data_frpl;
 443         }
 444         pr_debug("Create fr_desc %p page_list %p\n",
 445                  fr_desc, fr_desc->data_frpl->page_list);
 446         fr_desc->ind |= ISERT_DATA_KEY_VALID;
 447
 448         if (protection) {
 449                 struct ib_mr_init_attr mr_init_attr = {0};
 450                 struct pi_context *pi_ctx;
 451
 452                 fr_desc->pi_ctx = kzalloc(sizeof(*fr_desc->pi_ctx), GFP_KERNEL);
 453                 if (!fr_desc->pi_ctx) {
 454                         pr_err("Failed to allocate pi context\n");
 455                         ret = -ENOMEM;
 456                         goto err_data_mr;
 457                 }
 458                 pi_ctx = fr_desc->pi_ctx;
 459
 460                 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device,
 461                                                     ISCSI_ISER_SG_TABLESIZE);
 462                 if (IS_ERR(pi_ctx->prot_frpl)) {
 463                         pr_err("Failed to allocate prot frpl err=%ld\n",
 464                                PTR_ERR(pi_ctx->prot_frpl));
 465                         ret = PTR_ERR(pi_ctx->prot_frpl);
 466                         goto err_pi_ctx;
 467                 }
 468
 469                 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 470                 if (IS_ERR(pi_ctx->prot_mr)) {
 471                         pr_err("Failed to allocate prot frmr err=%ld\n",
 472                                PTR_ERR(pi_ctx->prot_mr));
 473                         ret = PTR_ERR(pi_ctx->prot_mr);
 474                         goto err_prot_frpl;
 475                 }
 476                 fr_desc->ind |= ISERT_PROT_KEY_VALID;
 477
 478                 mr_init_attr.max_reg_descriptors = 2;
 479                 mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
 480                 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
 481                 if (IS_ERR(pi_ctx->sig_mr)) {
 482                         pr_err("Failed to allocate signature enabled mr err=%ld\n",
 483                                PTR_ERR(pi_ctx->sig_mr));
 484                         ret = PTR_ERR(pi_ctx->sig_mr);
 485                         goto err_prot_mr;
 486                 }
 487                 fr_desc->ind |= ISERT_SIG_KEY_VALID;
 488         }
 489         fr_desc->ind &= ~ISERT_PROTECTED;
 490
 491         return 0;
 492 err_prot_mr:
 493         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 494 err_prot_frpl:
 495         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 496 err_pi_ctx:
 497         kfree(fr_desc->pi_ctx);
 498 err_data_mr:
 499         ib_dereg_mr(fr_desc->data_mr);
 500 err_data_frpl:
 501         ib_free_fast_reg_page_list(fr_desc->data_frpl);
 502
 503         return ret;
 504 }
 505
 506 static int
 507 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn, u8 pi_support)
 508 {
 509         struct fast_reg_descriptor *fr_desc;
 510         struct isert_device *device = isert_conn->conn_device;
 511         int i, ret;
 512
 513         INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
 514         isert_conn->conn_fr_pool_size = 0;
 515         for (i = 0; i < ISCSI_DEF_XMIT_CMDS_MAX; i++) {
 516                 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
 517                 if (!fr_desc) {
 518                         pr_err("Failed to allocate fast_reg descriptor\n");
 519                         ret = -ENOMEM;
 520                         goto err;
 521                 }
 522
 523                 ret = isert_create_fr_desc(device->ib_device,
 524                                            isert_conn->conn_pd, fr_desc,
 525                                            pi_support);
 526                 if (ret) {
 527                         pr_err("Failed to create fastreg descriptor err=%d\n",
 528                                ret);
 529                         kfree(fr_desc);
 530                         goto err;
 531                 }
 532
 533                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
 534                 isert_conn->conn_fr_pool_size++;
 535         }
 536
 537         pr_debug("Creating conn %p fastreg pool size=%d",
 538                  isert_conn, isert_conn->conn_fr_pool_size);
 539
 540         return 0;
 541
 542 err:
 543         isert_conn_free_fastreg_pool(isert_conn);
 544         return ret;
 545 }
 546
 547 static int
 548 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 549 {
 550         struct iscsi_np *np = cma_id->context;
 551         struct isert_np *isert_np = np->np_context;
 552         struct isert_conn *isert_conn;
 553         struct isert_device *device;
 554         struct ib_device *ib_dev = cma_id->device;
 555         int ret = 0;
 556         u8 pi_support = np->tpg_np->tpg->tpg_attrib.t10_pi;
 557
 558         pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
 559                  cma_id, cma_id->context);
 560
 561         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 562         if (!isert_conn) {
 563                 pr_err("Unable to allocate isert_conn\n");
 564                 return -ENOMEM;
 565         }
 566         isert_conn->state = ISER_CONN_INIT;
 567         INIT_LIST_HEAD(&isert_conn->conn_accept_node);
 568         init_completion(&isert_conn->conn_login_comp);
 569         init_completion(&isert_conn->conn_wait);
 570         init_completion(&isert_conn->conn_wait_comp_err);
 571         kref_init(&isert_conn->conn_kref);
 572         kref_get(&isert_conn->conn_kref);
 573         mutex_init(&isert_conn->conn_mutex);
 574         spin_lock_init(&isert_conn->conn_lock);
 575
 576         cma_id->context = isert_conn;
 577         isert_conn->conn_cm_id = cma_id;
 578         isert_conn->responder_resources = event->param.conn.responder_resources;
 579         isert_conn->initiator_depth = event->param.conn.initiator_depth;
 580         pr_debug("Using responder_resources: %u initiator_depth: %u\n",
 581                  isert_conn->responder_resources, isert_conn->initiator_depth);
 582
 583         isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
 584                                         ISER_RX_LOGIN_SIZE, GFP_KERNEL);
 585         if (!isert_conn->login_buf) {
 586                 pr_err("Unable to allocate isert_conn->login_buf\n");
 587                 ret = -ENOMEM;
 588                 goto out;
 589         }
 590
 591         isert_conn->login_req_buf = isert_conn->login_buf;
 592         isert_conn->login_rsp_buf = isert_conn->login_buf +
 593                                     ISCSI_DEF_MAX_RECV_SEG_LEN;
 594         pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
 595                  isert_conn->login_buf, isert_conn->login_req_buf,
 596                  isert_conn->login_rsp_buf);
 597
 598         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 599                                 (void *)isert_conn->login_req_buf,
 600                                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 601
 602         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 603         if (ret) {
 604                 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
 605                        ret);
 606                 isert_conn->login_req_dma = 0;
 607                 goto out_login_buf;
 608         }
 609
 610         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 611                                         (void *)isert_conn->login_rsp_buf,
 612                                         ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 613
 614         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 615         if (ret) {
 616                 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
 617                        ret);
 618                 isert_conn->login_rsp_dma = 0;
 619                 goto out_req_dma_map;
 620         }
 621
 622         device = isert_device_find_by_ib_dev(cma_id);
 623         if (IS_ERR(device)) {
 624                 ret = PTR_ERR(device);
 625                 goto out_rsp_dma_map;
 626         }
 627
 628         isert_conn->conn_device = device;
 629         isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
 630         if (IS_ERR(isert_conn->conn_pd)) {
 631                 ret = PTR_ERR(isert_conn->conn_pd);
 632                 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
 633                        isert_conn, ret);
 634                 goto out_pd;
 635         }
 636
 637         isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
 638                                            IB_ACCESS_LOCAL_WRITE);
 639         if (IS_ERR(isert_conn->conn_mr)) {
 640                 ret = PTR_ERR(isert_conn->conn_mr);
 641                 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
 642                        isert_conn, ret);
 643                 goto out_mr;
 644         }
 645
 646         if (pi_support && !device->pi_capable) {
 647                 pr_err("Protection information requested but not supported\n");
 648                 ret = -EINVAL;
 649                 goto out_mr;
 650         }
 651
 652         if (device->use_fastreg) {
 653                 ret = isert_conn_create_fastreg_pool(isert_conn, pi_support);
 654                 if (ret) {
 655                         pr_err("Conn: %p failed to create fastreg pool\n",
 656                                isert_conn);
 657                         goto out_fastreg;
 658                 }
 659         }
 660
 661         ret = isert_conn_setup_qp(isert_conn, cma_id, pi_support);
 662         if (ret)
 663                 goto out_conn_dev;
 664
 665         mutex_lock(&isert_np->np_accept_mutex);
 666         list_add_tail(&isert_np->np_accept_list, &isert_conn->conn_accept_node);
 667         mutex_unlock(&isert_np->np_accept_mutex);
 668
 669         pr_debug("isert_connect_request() waking up np_accept_wq: %p\n", np);
 670         wake_up(&isert_np->np_accept_wq);
 671         return 0;
 672
 673 out_conn_dev:
 674         if (device->use_fastreg)
 675                 isert_conn_free_fastreg_pool(isert_conn);
 676 out_fastreg:
 677         ib_dereg_mr(isert_conn->conn_mr);
 678 out_mr:
 679         ib_dealloc_pd(isert_conn->conn_pd);
 680 out_pd:
 681         isert_device_try_release(device);
 682 out_rsp_dma_map:
 683         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 684                             ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 685 out_req_dma_map:
 686         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 687                             ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 688 out_login_buf:
 689         kfree(isert_conn->login_buf);
 690 out:
 691         kfree(isert_conn);
 692         return ret;
 693 }
 694
 695 static void
 696 isert_connect_release(struct isert_conn *isert_conn)
 697 {
 698         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 699         struct isert_device *device = isert_conn->conn_device;
 700         int cq_index;
 701
 702         pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 703
 704         if (device && device->use_fastreg)
 705                 isert_conn_free_fastreg_pool(isert_conn);
 706
 707         if (isert_conn->conn_qp) {
 708                 cq_index = ((struct isert_cq_desc *)
 709                         isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
 710                 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
 711                 isert_conn->conn_device->cq_active_qps[cq_index]--;
 712
 713                 rdma_destroy_qp(isert_conn->conn_cm_id);
 714         }
 715
 716         isert_free_rx_descriptors(isert_conn);
 717         rdma_destroy_id(isert_conn->conn_cm_id);
 718
 719         ib_dereg_mr(isert_conn->conn_mr);
 720         ib_dealloc_pd(isert_conn->conn_pd);
 721
 722         if (isert_conn->login_buf) {
 723                 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 724                                     ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 725                 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 726                                     ISCSI_DEF_MAX_RECV_SEG_LEN,
 727                                     DMA_FROM_DEVICE);
 728                 kfree(isert_conn->login_buf);
 729         }
 730         kfree(isert_conn);
 731
 732         if (device)
 733                 isert_device_try_release(device);
 734
 735         pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
 736 }
 737
 738 static void
 739 isert_connected_handler(struct rdma_cm_id *cma_id)
 740 {
 741         return;
 742 }
 743
 744 static void
 745 isert_release_conn_kref(struct kref *kref)
 746 {
 747         struct isert_conn *isert_conn = container_of(kref,
 748                                 struct isert_conn, conn_kref);
 749
 750         pr_debug("Calling isert_connect_release for final kref %s/%d\n",
 751                  current->comm, current->pid);
 752
 753         isert_connect_release(isert_conn);
 754 }
 755
 756 static void
 757 isert_put_conn(struct isert_conn *isert_conn)
 758 {
 759         kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
 760 }
 761
 762 static void
 763 isert_disconnect_work(struct work_struct *work)
 764 {
 765         struct isert_conn *isert_conn = container_of(work,
 766                                 struct isert_conn, conn_logout_work);
 767
 768         pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 769         mutex_lock(&isert_conn->conn_mutex);
 770         if (isert_conn->state == ISER_CONN_UP)
 771                 isert_conn->state = ISER_CONN_TERMINATING;
 772
 773         if (isert_conn->post_recv_buf_count == 0 &&
 774             atomic_read(&isert_conn->post_send_buf_count) == 0) {
 775                 mutex_unlock(&isert_conn->conn_mutex);
 776                 goto wake_up;
 777         }
 778         if (!isert_conn->conn_cm_id) {
 779                 mutex_unlock(&isert_conn->conn_mutex);
 780                 isert_put_conn(isert_conn);
 781                 return;
 782         }
 783         if (!isert_conn->logout_posted) {
 784                 pr_debug("Calling rdma_disconnect for !logout_posted from"
 785                          " isert_disconnect_work\n");
 786                 rdma_disconnect(isert_conn->conn_cm_id);
 787                 mutex_unlock(&isert_conn->conn_mutex);
 788                 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
 789                 goto wake_up;
 790         }
 791         mutex_unlock(&isert_conn->conn_mutex);
 792
 793 wake_up:
 794         complete(&isert_conn->conn_wait);
 795         isert_put_conn(isert_conn);
 796 }
 797
 798 static void
 799 isert_disconnected_handler(struct rdma_cm_id *cma_id)
 800 {
 801         struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
 802
 803         INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
 804         schedule_work(&isert_conn->conn_logout_work);
 805 }
 806
 807 static int
 808 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 809 {
 810         int ret = 0;
 811
 812         pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
 813                  event->event, event->status, cma_id->context, cma_id);
 814
 815         switch (event->event) {
 816         case RDMA_CM_EVENT_CONNECT_REQUEST:
 817                 pr_debug("RDMA_CM_EVENT_CONNECT_REQUEST: >>>>>>>>>>>>>>>\n");
 818                 ret = isert_connect_request(cma_id, event);
 819                 break;
 820         case RDMA_CM_EVENT_ESTABLISHED:
 821                 pr_debug("RDMA_CM_EVENT_ESTABLISHED >>>>>>>>>>>>>>\n");
 822                 isert_connected_handler(cma_id);
 823                 break;
 824         case RDMA_CM_EVENT_DISCONNECTED:
 825                 pr_debug("RDMA_CM_EVENT_DISCONNECTED: >>>>>>>>>>>>>>\n");
 826                 isert_disconnected_handler(cma_id);
 827                 break;
 828         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 829         case RDMA_CM_EVENT_ADDR_CHANGE:
 830                 break;
 831         case RDMA_CM_EVENT_CONNECT_ERROR:
 832         default:
 833                 pr_err("Unknown RDMA CMA event: %d\n", event->event);
 834                 break;
 835         }
 836
 837         if (ret != 0) {
 838                 pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
 839                        event->event, ret);
 840                 dump_stack();
 841         }
 842
 843         return ret;
 844 }
 845
 846 static int
 847 isert_post_recv(struct isert_conn *isert_conn, u32 count)
 848 {
 849         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 850         int i, ret;
 851         unsigned int rx_head = isert_conn->conn_rx_desc_head;
 852         struct iser_rx_desc *rx_desc;
 853
 854         for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
 855                 rx_desc         = &isert_conn->conn_rx_descs[rx_head];
 856                 rx_wr->wr_id    = (unsigned long)rx_desc;
 857                 rx_wr->sg_list  = &rx_desc->rx_sg;
 858                 rx_wr->num_sge  = 1;
 859                 rx_wr->next     = rx_wr + 1;
 860                 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
 861         }
 862
 863         rx_wr--;
 864         rx_wr->next = NULL; /* mark end of work requests list */
 865
 866         isert_conn->post_recv_buf_count += count;
 867         ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
 868                                 &rx_wr_failed);
 869         if (ret) {
 870                 pr_err("ib_post_recv() failed with ret: %d\n", ret);
 871                 isert_conn->post_recv_buf_count -= count;
 872         } else {
 873                 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
 874                 isert_conn->conn_rx_desc_head = rx_head;
 875         }
 876         return ret;
 877 }
 878
 879 static int
 880 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 881 {
 882         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 883         struct ib_send_wr send_wr, *send_wr_failed;
 884         int ret;
 885
 886         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 887                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 888
 889         send_wr.next    = NULL;
 890         send_wr.wr_id   = (unsigned long)tx_desc;
 891         send_wr.sg_list = tx_desc->tx_sg;
 892         send_wr.num_sge = tx_desc->num_sge;
 893         send_wr.opcode  = IB_WR_SEND;
 894         send_wr.send_flags = IB_SEND_SIGNALED;
 895
 896         atomic_inc(&isert_conn->post_send_buf_count);
 897
 898         ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
 899         if (ret) {
 900                 pr_err("ib_post_send() failed, ret: %d\n", ret);
 901                 atomic_dec(&isert_conn->post_send_buf_count);
 902         }
 903
 904         return ret;
 905 }
 906
 907 static void
 908 isert_create_send_desc(struct isert_conn *isert_conn,
 909                        struct isert_cmd *isert_cmd,
 910                        struct iser_tx_desc *tx_desc)
 911 {
 912         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 913
 914         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 915                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 916
 917         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
 918         tx_desc->iser_header.flags = ISER_VER;
 919
 920         tx_desc->num_sge = 1;
 921         tx_desc->isert_cmd = isert_cmd;
 922
 923         if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
 924                 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 925                 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 926         }
 927 }
 928
 929 static int
 930 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 931                    struct iser_tx_desc *tx_desc)
 932 {
 933         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 934         u64 dma_addr;
 935
 936         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 937                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 938         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 939                 pr_err("ib_dma_mapping_error() failed\n");
 940                 return -ENOMEM;
 941         }
 942
 943         tx_desc->dma_addr = dma_addr;
 944         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 945         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 946         tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 947
 948         pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
 949                  " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
 950                  tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
 951
 952         return 0;
 953 }
 954
 955 static void
 956 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 957                    struct ib_send_wr *send_wr, bool coalesce)
 958 {
 959         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 960
 961         isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
 962         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
 963         send_wr->opcode = IB_WR_SEND;
 964         send_wr->sg_list = &tx_desc->tx_sg[0];
 965         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 966         /*
 967          * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
 968          * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
 969          */
 970         mutex_lock(&isert_conn->conn_mutex);
 971         if (coalesce && isert_conn->state == ISER_CONN_UP &&
 972             ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
 973                 tx_desc->llnode_active = true;
 974                 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
 975                 mutex_unlock(&isert_conn->conn_mutex);
 976                 return;
 977         }
 978         isert_conn->conn_comp_batch = 0;
 979         tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
 980         mutex_unlock(&isert_conn->conn_mutex);
 981
 982         send_wr->send_flags = IB_SEND_SIGNALED;
 983 }
 984
 985 static int
 986 isert_rdma_post_recvl(struct isert_conn *isert_conn)
 987 {
 988         struct ib_recv_wr rx_wr, *rx_wr_fail;
 989         struct ib_sge sge;
 990         int ret;
 991
 992         memset(&sge, 0, sizeof(struct ib_sge));
 993         sge.addr = isert_conn->login_req_dma;
 994         sge.length = ISER_RX_LOGIN_SIZE;
 995         sge.lkey = isert_conn->conn_mr->lkey;
 996
 997         pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
 998                 sge.addr, sge.length, sge.lkey);
 999
1000         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1001         rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
1002         rx_wr.sg_list = &sge;
1003         rx_wr.num_sge = 1;
1004
1005         isert_conn->post_recv_buf_count++;
1006         ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
1007         if (ret) {
1008                 pr_err("ib_post_recv() failed: %d\n", ret);
1009                 isert_conn->post_recv_buf_count--;
1010         }
1011
1012         pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
1013         return ret;
1014 }
1015
1016 static int
1017 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1018                    u32 length)
1019 {
1020         struct isert_conn *isert_conn = conn->context;
1021         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1022         struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
1023         int ret;
1024
1025         isert_create_send_desc(isert_conn, NULL, tx_desc);
1026
1027         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1028                sizeof(struct iscsi_hdr));
1029
1030         isert_init_tx_hdrs(isert_conn, tx_desc);
1031
1032         if (length > 0) {
1033                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1034
1035                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1036                                            length, DMA_TO_DEVICE);
1037
1038                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1039
1040                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1041                                               length, DMA_TO_DEVICE);
1042
1043                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1044                 tx_dsg->length  = length;
1045                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1046                 tx_desc->num_sge = 2;
1047         }
1048         if (!login->login_failed) {
1049                 if (login->login_complete) {
1050                         ret = isert_alloc_rx_descriptors(isert_conn);
1051                         if (ret)
1052                                 return ret;
1053
1054                         ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1055                         if (ret)
1056                                 return ret;
1057
1058                         isert_conn->state = ISER_CONN_UP;
1059                         goto post_send;
1060                 }
1061
1062                 ret = isert_rdma_post_recvl(isert_conn);
1063                 if (ret)
1064                         return ret;
1065         }
1066 post_send:
1067         ret = isert_post_send(isert_conn, tx_desc);
1068         if (ret)
1069                 return ret;
1070
1071         return 0;
1072 }
1073
1074 static void
1075 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
1076                    struct isert_conn *isert_conn)
1077 {
1078         struct iscsi_conn *conn = isert_conn->conn;
1079         struct iscsi_login *login = conn->conn_login;
1080         int size;
1081
1082         if (!login) {
1083                 pr_err("conn->conn_login is NULL\n");
1084                 dump_stack();
1085                 return;
1086         }
1087
1088         if (login->first_request) {
1089                 struct iscsi_login_req *login_req =
1090                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1091                 /*
1092                  * Setup the initial iscsi_login values from the leading
1093                  * login request PDU.
1094                  */
1095                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1096                 login->current_stage =
1097                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1098                          >> 2;
1099                 login->version_min      = login_req->min_version;
1100                 login->version_max      = login_req->max_version;
1101                 memcpy(login->isid, login_req->isid, 6);
1102                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1103                 login->init_task_tag    = login_req->itt;
1104                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1105                 login->cid              = be16_to_cpu(login_req->cid);
1106                 login->tsih             = be16_to_cpu(login_req->tsih);
1107         }
1108
1109         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1110
1111         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1112         pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1113                  size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1114         memcpy(login->req_buf, &rx_desc->data[0], size);
1115
1116         if (login->first_request) {
1117                 complete(&isert_conn->conn_login_comp);
1118                 return;
1119         }
1120         schedule_delayed_work(&conn->login_work, 0);
1121 }
1122
1123 static struct iscsi_cmd
1124 *isert_allocate_cmd(struct iscsi_conn *conn)
1125 {
1126         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1127         struct isert_cmd *isert_cmd;
1128         struct iscsi_cmd *cmd;
1129
1130         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1131         if (!cmd) {
1132                 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1133                 return NULL;
1134         }
1135         isert_cmd = iscsit_priv_cmd(cmd);
1136         isert_cmd->conn = isert_conn;
1137         isert_cmd->iscsi_cmd = cmd;
1138
1139         return cmd;
1140 }
1141
1142 static int
1143 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1144                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1145                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1146 {
1147         struct iscsi_conn *conn = isert_conn->conn;
1148         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1149         struct scatterlist *sg;
1150         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1151         bool dump_payload = false;
1152
1153         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1154         if (rc < 0)
1155                 return rc;
1156
1157         imm_data = cmd->immediate_data;
1158         imm_data_len = cmd->first_burst_len;
1159         unsol_data = cmd->unsolicited_data;
1160
1161         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1162         if (rc < 0) {
1163                 return 0;
1164         } else if (rc > 0) {
1165                 dump_payload = true;
1166                 goto sequence_cmd;
1167         }
1168
1169         if (!imm_data)
1170                 return 0;
1171
1172         sg = &cmd->se_cmd.t_data_sg[0];
1173         sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1174
1175         pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1176                  sg, sg_nents, &rx_desc->data[0], imm_data_len);
1177
1178         sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1179
1180         cmd->write_data_done += imm_data_len;
1181
1182         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1183                 spin_lock_bh(&cmd->istate_lock);
1184                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1185                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1186                 spin_unlock_bh(&cmd->istate_lock);
1187         }
1188
1189 sequence_cmd:
1190         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1191
1192         if (!rc && dump_payload == false && unsol_data)
1193                 iscsit_set_unsoliticed_dataout(cmd);
1194
1195         return 0;
1196 }
1197
1198 static int
1199 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1200                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1201 {
1202         struct scatterlist *sg_start;
1203         struct iscsi_conn *conn = isert_conn->conn;
1204         struct iscsi_cmd *cmd = NULL;
1205         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1206         u32 unsol_data_len = ntoh24(hdr->dlength);
1207         int rc, sg_nents, sg_off, page_off;
1208
1209         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1210         if (rc < 0)
1211                 return rc;
1212         else if (!cmd)
1213                 return 0;
1214         /*
1215          * FIXME: Unexpected unsolicited_data out
1216          */
1217         if (!cmd->unsolicited_data) {
1218                 pr_err("Received unexpected solicited data payload\n");
1219                 dump_stack();
1220                 return -1;
1221         }
1222
1223         pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1224                  unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1225
1226         sg_off = cmd->write_data_done / PAGE_SIZE;
1227         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1228         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1229         page_off = cmd->write_data_done % PAGE_SIZE;
1230         /*
1231          * FIXME: Non page-aligned unsolicited_data out
1232          */
1233         if (page_off) {
1234                 pr_err("Received unexpected non-page aligned data payload\n");
1235                 dump_stack();
1236                 return -1;
1237         }
1238         pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1239                  sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1240
1241         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1242                             unsol_data_len);
1243
1244         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1245         if (rc < 0)
1246                 return rc;
1247
1248         return 0;
1249 }
1250
1251 static int
1252 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1253                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1254                      unsigned char *buf)
1255 {
1256         struct iscsi_conn *conn = isert_conn->conn;
1257         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1258         int rc;
1259
1260         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1261         if (rc < 0)
1262                 return rc;
1263         /*
1264          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1265          */
1266
1267         return iscsit_process_nop_out(conn, cmd, hdr);
1268 }
1269
1270 static int
1271 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1272                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1273                       struct iscsi_text *hdr)
1274 {
1275         struct iscsi_conn *conn = isert_conn->conn;
1276         u32 payload_length = ntoh24(hdr->dlength);
1277         int rc;
1278         unsigned char *text_in;
1279
1280         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1281         if (rc < 0)
1282                 return rc;
1283
1284         text_in = kzalloc(payload_length, GFP_KERNEL);
1285         if (!text_in) {
1286                 pr_err("Unable to allocate text_in of payload_length: %u\n",
1287                        payload_length);
1288                 return -ENOMEM;
1289         }
1290         cmd->text_in_ptr = text_in;
1291
1292         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1293
1294         return iscsit_process_text_cmd(conn, cmd, hdr);
1295 }
1296
1297 static int
1298 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1299                 uint32_t read_stag, uint64_t read_va,
1300                 uint32_t write_stag, uint64_t write_va)
1301 {
1302         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1303         struct iscsi_conn *conn = isert_conn->conn;
1304         struct iscsi_session *sess = conn->sess;
1305         struct iscsi_cmd *cmd;
1306         struct isert_cmd *isert_cmd;
1307         int ret = -EINVAL;
1308         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1309
1310         if (sess->sess_ops->SessionType &&
1311            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1312                 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1313                        " ignoring\n", opcode);
1314                 return 0;
1315         }
1316
1317         switch (opcode) {
1318         case ISCSI_OP_SCSI_CMD:
1319                 cmd = isert_allocate_cmd(conn);
1320                 if (!cmd)
1321                         break;
1322
1323                 isert_cmd = iscsit_priv_cmd(cmd);
1324                 isert_cmd->read_stag = read_stag;
1325                 isert_cmd->read_va = read_va;
1326                 isert_cmd->write_stag = write_stag;
1327                 isert_cmd->write_va = write_va;
1328
1329                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1330                                         rx_desc, (unsigned char *)hdr);
1331                 break;
1332         case ISCSI_OP_NOOP_OUT:
1333                 cmd = isert_allocate_cmd(conn);
1334                 if (!cmd)
1335                         break;
1336
1337                 isert_cmd = iscsit_priv_cmd(cmd);
1338                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1339                                            rx_desc, (unsigned char *)hdr);
1340                 break;
1341         case ISCSI_OP_SCSI_DATA_OUT:
1342                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1343                                                 (unsigned char *)hdr);
1344                 break;
1345         case ISCSI_OP_SCSI_TMFUNC:
1346                 cmd = isert_allocate_cmd(conn);
1347                 if (!cmd)
1348                         break;
1349
1350                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1351                                                 (unsigned char *)hdr);
1352                 break;
1353         case ISCSI_OP_LOGOUT:
1354                 cmd = isert_allocate_cmd(conn);
1355                 if (!cmd)
1356                         break;
1357
1358                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1359                 if (ret > 0)
1360                         wait_for_completion_timeout(&conn->conn_logout_comp,
1361                                                     SECONDS_FOR_LOGOUT_COMP *
1362                                                     HZ);
1363                 break;
1364         case ISCSI_OP_TEXT:
1365                 cmd = isert_allocate_cmd(conn);
1366                 if (!cmd)
1367                         break;
1368
1369                 isert_cmd = iscsit_priv_cmd(cmd);
1370                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1371                                             rx_desc, (struct iscsi_text *)hdr);
1372                 break;
1373         default:
1374                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1375                 dump_stack();
1376                 break;
1377         }
1378
1379         return ret;
1380 }
1381
1382 static void
1383 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1384 {
1385         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1386         uint64_t read_va = 0, write_va = 0;
1387         uint32_t read_stag = 0, write_stag = 0;
1388         int rc;
1389
1390         switch (iser_hdr->flags & 0xF0) {
1391         case ISCSI_CTRL:
1392                 if (iser_hdr->flags & ISER_RSV) {
1393                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1394                         read_va = be64_to_cpu(iser_hdr->read_va);
1395                         pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1396                                  read_stag, (unsigned long long)read_va);
1397                 }
1398                 if (iser_hdr->flags & ISER_WSV) {
1399                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1400                         write_va = be64_to_cpu(iser_hdr->write_va);
1401                         pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1402                                  write_stag, (unsigned long long)write_va);
1403                 }
1404
1405                 pr_debug("ISER ISCSI_CTRL PDU\n");
1406                 break;
1407         case ISER_HELLO:
1408                 pr_err("iSER Hello message\n");
1409                 break;
1410         default:
1411                 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1412                 break;
1413         }
1414
1415         rc = isert_rx_opcode(isert_conn, rx_desc,
1416                              read_stag, read_va, write_stag, write_va);
1417 }
1418
1419 static void
1420 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1421                     unsigned long xfer_len)
1422 {
1423         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1424         struct iscsi_hdr *hdr;
1425         u64 rx_dma;
1426         int rx_buflen, outstanding;
1427
1428         if ((char *)desc == isert_conn->login_req_buf) {
1429                 rx_dma = isert_conn->login_req_dma;
1430                 rx_buflen = ISER_RX_LOGIN_SIZE;
1431                 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1432                          rx_dma, rx_buflen);
1433         } else {
1434                 rx_dma = desc->dma_addr;
1435                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1436                 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1437                          rx_dma, rx_buflen);
1438         }
1439
1440         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1441
1442         hdr = &desc->iscsi_header;
1443         pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1444                  hdr->opcode, hdr->itt, hdr->flags,
1445                  (int)(xfer_len - ISER_HEADERS_LEN));
1446
1447         if ((char *)desc == isert_conn->login_req_buf)
1448                 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1449                                    isert_conn);
1450         else
1451                 isert_rx_do_work(desc, isert_conn);
1452
1453         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1454                                       DMA_FROM_DEVICE);
1455
1456         isert_conn->post_recv_buf_count--;
1457         pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1458                  isert_conn->post_recv_buf_count);
1459
1460         if ((char *)desc == isert_conn->login_req_buf)
1461                 return;
1462
1463         outstanding = isert_conn->post_recv_buf_count;
1464         if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1465                 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1466                                 ISERT_MIN_POSTED_RX);
1467                 err = isert_post_recv(isert_conn, count);
1468                 if (err) {
1469                         pr_err("isert_post_recv() count: %d failed, %d\n",
1470                                count, err);
1471                 }
1472         }
1473 }
1474
1475 static int
1476 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1477                    struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1478                    enum iser_ib_op_code op, struct isert_data_buf *data)
1479 {
1480         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1481
1482         data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1483                               DMA_TO_DEVICE : DMA_FROM_DEVICE;
1484
1485         data->len = length - offset;
1486         data->offset = offset;
1487         data->sg_off = data->offset / PAGE_SIZE;
1488
1489         data->sg = &sg[data->sg_off];
1490         data->nents = min_t(unsigned int, nents - data->sg_off,
1491                                           ISCSI_ISER_SG_TABLESIZE);
1492         data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1493                                         PAGE_SIZE);
1494
1495         data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1496                                         data->dma_dir);
1497         if (unlikely(!data->dma_nents)) {
1498                 pr_err("Cmd: unable to dma map SGs %p\n", sg);
1499                 return -EINVAL;
1500         }
1501
1502         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1503                  isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1504
1505         return 0;
1506 }
1507
1508 static void
1509 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1510 {
1511         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1512
1513         ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1514         memset(data, 0, sizeof(*data));
1515 }
1516
1517
1518
1519 static void
1520 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1521 {
1522         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1523
1524         pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1525
1526         if (wr->data.sg) {
1527                 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1528                 isert_unmap_data_buf(isert_conn, &wr->data);
1529         }
1530
1531         if (wr->send_wr) {
1532                 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1533                 kfree(wr->send_wr);
1534                 wr->send_wr = NULL;
1535         }
1536
1537         if (wr->ib_sge) {
1538                 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1539                 kfree(wr->ib_sge);
1540                 wr->ib_sge = NULL;
1541         }
1542 }
1543
1544 static void
1545 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1546 {
1547         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1548         LIST_HEAD(unmap_list);
1549
1550         pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1551
1552         if (wr->fr_desc) {
1553                 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1554                          isert_cmd, wr->fr_desc);
1555                 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1556                         isert_unmap_data_buf(isert_conn, &wr->prot);
1557                         wr->fr_desc->ind &= ~ISERT_PROTECTED;
1558                 }
1559                 spin_lock_bh(&isert_conn->conn_lock);
1560                 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1561                 spin_unlock_bh(&isert_conn->conn_lock);
1562                 wr->fr_desc = NULL;
1563         }
1564
1565         if (wr->data.sg) {
1566                 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1567                 isert_unmap_data_buf(isert_conn, &wr->data);
1568         }
1569
1570         wr->ib_sge = NULL;
1571         wr->send_wr = NULL;
1572 }
1573
1574 static void
1575 isert_put_cmd(struct isert_cmd *isert_cmd)
1576 {
1577         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1578         struct isert_conn *isert_conn = isert_cmd->conn;
1579         struct iscsi_conn *conn = isert_conn->conn;
1580         struct isert_device *device = isert_conn->conn_device;
1581
1582         pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1583
1584         switch (cmd->iscsi_opcode) {
1585         case ISCSI_OP_SCSI_CMD:
1586                 spin_lock_bh(&conn->cmd_lock);
1587                 if (!list_empty(&cmd->i_conn_node))
1588                         list_del_init(&cmd->i_conn_node);
1589                 spin_unlock_bh(&conn->cmd_lock);
1590
1591                 if (cmd->data_direction == DMA_TO_DEVICE)
1592                         iscsit_stop_dataout_timer(cmd);
1593
1594                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1595                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1596                 break;
1597         case ISCSI_OP_SCSI_TMFUNC:
1598                 spin_lock_bh(&conn->cmd_lock);
1599                 if (!list_empty(&cmd->i_conn_node))
1600                         list_del_init(&cmd->i_conn_node);
1601                 spin_unlock_bh(&conn->cmd_lock);
1602
1603                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1604                 break;
1605         case ISCSI_OP_REJECT:
1606         case ISCSI_OP_NOOP_OUT:
1607         case ISCSI_OP_TEXT:
1608                 spin_lock_bh(&conn->cmd_lock);
1609                 if (!list_empty(&cmd->i_conn_node))
1610                         list_del_init(&cmd->i_conn_node);
1611                 spin_unlock_bh(&conn->cmd_lock);
1612
1613                 /*
1614                  * Handle special case for REJECT when iscsi_add_reject*() has
1615                  * overwritten the original iscsi_opcode assignment, and the
1616                  * associated cmd->se_cmd needs to be released.
1617                  */
1618                 if (cmd->se_cmd.se_tfo != NULL) {
1619                         pr_debug("Calling transport_generic_free_cmd from"
1620                                  " isert_put_cmd for 0x%02x\n",
1621                                  cmd->iscsi_opcode);
1622                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1623                         break;
1624                 }
1625                 /*
1626                  * Fall-through
1627                  */
1628         default:
1629                 iscsit_release_cmd(cmd);
1630                 break;
1631         }
1632 }
1633
1634 static void
1635 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1636 {
1637         if (tx_desc->dma_addr != 0) {
1638                 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1639                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1640                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1641                 tx_desc->dma_addr = 0;
1642         }
1643 }
1644
1645 static void
1646 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1647                      struct ib_device *ib_dev)
1648 {
1649         if (isert_cmd->pdu_buf_dma != 0) {
1650                 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1651                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1652                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1653                 isert_cmd->pdu_buf_dma = 0;
1654         }
1655
1656         isert_unmap_tx_desc(tx_desc, ib_dev);
1657         isert_put_cmd(isert_cmd);
1658 }
1659
1660 static void
1661 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1662                             struct isert_cmd *isert_cmd)
1663 {
1664         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1665         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1666         struct se_cmd *se_cmd = &cmd->se_cmd;
1667         struct isert_conn *isert_conn = isert_cmd->conn;
1668         struct isert_device *device = isert_conn->conn_device;
1669         struct ib_mr_status mr_status;
1670         int ret = 0;
1671
1672         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1673                 ret = ib_check_mr_status(wr->fr_desc->pi_ctx->sig_mr,
1674                                          IB_MR_CHECK_SIG_STATUS, &mr_status);
1675                 if (ret) {
1676                         pr_err("ib_check_mr_status failed, ret %d\n", ret);
1677                         goto fail_mr_status;
1678                 }
1679                 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1680                         u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1681
1682                         switch (mr_status.sig_err.err_type) {
1683                         case IB_SIG_BAD_GUARD:
1684                                 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1685                                 break;
1686                         case IB_SIG_BAD_REFTAG:
1687                                 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1688                                 break;
1689                         case IB_SIG_BAD_APPTAG:
1690                                 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1691                                 break;
1692                         }
1693                         se_cmd->bad_sector = mr_status.sig_err.sig_err_offset;
1694                         do_div(se_cmd->bad_sector, block_size);
1695
1696                         pr_err("isert: PI error found type %d at sector 0x%llx "
1697                                "expected 0x%x vs actual 0x%x\n",
1698                                mr_status.sig_err.err_type,
1699                                (unsigned long long)se_cmd->bad_sector,
1700                                mr_status.sig_err.expected,
1701                                mr_status.sig_err.actual);
1702                         ret = 1;
1703                 }
1704         }
1705
1706 fail_mr_status:
1707         device->unreg_rdma_mem(isert_cmd, isert_conn);
1708         if (ret)
1709                 transport_send_check_condition_and_sense(se_cmd,
1710                                                          se_cmd->pi_err, 0);
1711         else
1712                 isert_put_response(isert_conn->conn, cmd);
1713 }
1714
1715 static void
1716 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1717                            struct isert_cmd *isert_cmd)
1718 {
1719         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1720         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1721         struct se_cmd *se_cmd = &cmd->se_cmd;
1722         struct isert_conn *isert_conn = isert_cmd->conn;
1723         struct isert_device *device = isert_conn->conn_device;
1724         struct ib_mr_status mr_status;
1725         int ret;
1726
1727         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1728                 ret = ib_check_mr_status(wr->fr_desc->pi_ctx->sig_mr,
1729                                          IB_MR_CHECK_SIG_STATUS, &mr_status);
1730                 if (ret) {
1731                         pr_err("ib_check_mr_status failed, ret %d\n", ret);
1732                         goto fail_mr_status;
1733                 }
1734                 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1735                         u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1736
1737                         switch (mr_status.sig_err.err_type) {
1738                         case IB_SIG_BAD_GUARD:
1739                                 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1740                                 break;
1741                         case IB_SIG_BAD_REFTAG:
1742                                 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1743                                 break;
1744                         case IB_SIG_BAD_APPTAG:
1745                                 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1746                                 break;
1747                         }
1748                         se_cmd->bad_sector = mr_status.sig_err.sig_err_offset;
1749                         do_div(se_cmd->bad_sector, block_size);
1750
1751                         pr_err("isert: PI error found type %d at sector 0x%llx "
1752                                "expected 0x%x vs actual 0x%x\n",
1753                                mr_status.sig_err.err_type,
1754                                (unsigned long long)se_cmd->bad_sector,
1755                                mr_status.sig_err.expected,
1756                                mr_status.sig_err.actual);
1757                 }
1758         }
1759
1760 fail_mr_status:
1761         iscsit_stop_dataout_timer(cmd);
1762         device->unreg_rdma_mem(isert_cmd, isert_conn);
1763         cmd->write_data_done = wr->data.len;
1764         wr->send_wr_num = 0;
1765
1766         pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1767         spin_lock_bh(&cmd->istate_lock);
1768         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1769         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1770         spin_unlock_bh(&cmd->istate_lock);
1771
1772         target_execute_cmd(se_cmd);
1773 }
1774
1775 static void
1776 isert_do_control_comp(struct work_struct *work)
1777 {
1778         struct isert_cmd *isert_cmd = container_of(work,
1779                         struct isert_cmd, comp_work);
1780         struct isert_conn *isert_conn = isert_cmd->conn;
1781         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1782         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1783
1784         switch (cmd->i_state) {
1785         case ISTATE_SEND_TASKMGTRSP:
1786                 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1787
1788                 atomic_dec(&isert_conn->post_send_buf_count);
1789                 iscsit_tmr_post_handler(cmd, cmd->conn);
1790
1791                 cmd->i_state = ISTATE_SENT_STATUS;
1792                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1793                 break;
1794         case ISTATE_SEND_REJECT:
1795                 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1796                 atomic_dec(&isert_conn->post_send_buf_count);
1797
1798                 cmd->i_state = ISTATE_SENT_STATUS;
1799                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1800                 break;
1801         case ISTATE_SEND_LOGOUTRSP:
1802                 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1803                 /*
1804                  * Call atomic_dec(&isert_conn->post_send_buf_count)
1805                  * from isert_wait_conn()
1806                  */
1807                 isert_conn->logout_posted = true;
1808                 iscsit_logout_post_handler(cmd, cmd->conn);
1809                 break;
1810         case ISTATE_SEND_TEXTRSP:
1811                 atomic_dec(&isert_conn->post_send_buf_count);
1812                 cmd->i_state = ISTATE_SENT_STATUS;
1813                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1814                 break;
1815         default:
1816                 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1817                 dump_stack();
1818                 break;
1819         }
1820 }
1821
1822 static void
1823 isert_response_completion(struct iser_tx_desc *tx_desc,
1824                           struct isert_cmd *isert_cmd,
1825                           struct isert_conn *isert_conn,
1826                           struct ib_device *ib_dev)
1827 {
1828         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1829         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1830
1831         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1832             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1833             cmd->i_state == ISTATE_SEND_REJECT ||
1834             cmd->i_state == ISTATE_SEND_TEXTRSP) {
1835                 isert_unmap_tx_desc(tx_desc, ib_dev);
1836
1837                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1838                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1839                 return;
1840         }
1841         atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1842
1843         cmd->i_state = ISTATE_SENT_STATUS;
1844         isert_completion_put(tx_desc, isert_cmd, ib_dev);
1845 }
1846
1847 static void
1848 __isert_send_completion(struct iser_tx_desc *tx_desc,
1849                         struct isert_conn *isert_conn)
1850 {
1851         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1852         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1853         struct isert_rdma_wr *wr;
1854
1855         if (!isert_cmd) {
1856                 atomic_dec(&isert_conn->post_send_buf_count);
1857                 isert_unmap_tx_desc(tx_desc, ib_dev);
1858                 return;
1859         }
1860         wr = &isert_cmd->rdma_wr;
1861
1862         switch (wr->iser_ib_op) {
1863         case ISER_IB_RECV:
1864                 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1865                 dump_stack();
1866                 break;
1867         case ISER_IB_SEND:
1868                 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1869                 isert_response_completion(tx_desc, isert_cmd,
1870                                           isert_conn, ib_dev);
1871                 break;
1872         case ISER_IB_RDMA_WRITE:
1873                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1874                 atomic_dec(&isert_conn->post_send_buf_count);
1875                 isert_completion_rdma_write(tx_desc, isert_cmd);
1876                 break;
1877         case ISER_IB_RDMA_READ:
1878                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1879
1880                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1881                 isert_completion_rdma_read(tx_desc, isert_cmd);
1882                 break;
1883         default:
1884                 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1885                 dump_stack();
1886                 break;
1887         }
1888 }
1889
1890 static void
1891 isert_send_completion(struct iser_tx_desc *tx_desc,
1892                       struct isert_conn *isert_conn)
1893 {
1894         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1895         struct iser_tx_desc *t;
1896         /*
1897          * Drain coalesced completion llist starting from comp_llnode_batch
1898          * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1899          */
1900         while (llnode) {
1901                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1902                 llnode = llist_next(llnode);
1903                 __isert_send_completion(t, isert_conn);
1904         }
1905         __isert_send_completion(tx_desc, isert_conn);
1906 }
1907
1908 static void
1909 isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1910 {
1911         struct llist_node *llnode;
1912         struct isert_rdma_wr *wr;
1913         struct iser_tx_desc *t;
1914
1915         mutex_lock(&isert_conn->conn_mutex);
1916         llnode = llist_del_all(&isert_conn->conn_comp_llist);
1917         isert_conn->conn_comp_batch = 0;
1918         mutex_unlock(&isert_conn->conn_mutex);
1919
1920         while (llnode) {
1921                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1922                 llnode = llist_next(llnode);
1923                 wr = &t->isert_cmd->rdma_wr;
1924
1925                 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1926                 isert_completion_put(t, t->isert_cmd, ib_dev);
1927         }
1928 }
1929
1930 static void
1931 isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1932 {
1933         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1934         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1935         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1936         struct isert_rdma_wr *wr;
1937         struct iser_tx_desc *t;
1938
1939         while (llnode) {
1940                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1941                 llnode = llist_next(llnode);
1942                 wr = &t->isert_cmd->rdma_wr;
1943
1944                 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1945                 isert_completion_put(t, t->isert_cmd, ib_dev);
1946         }
1947         tx_desc->comp_llnode_batch = NULL;
1948
1949         if (!isert_cmd)
1950                 isert_unmap_tx_desc(tx_desc, ib_dev);
1951         else
1952                 isert_completion_put(tx_desc, isert_cmd, ib_dev);
1953 }
1954
1955 static void
1956 isert_cq_rx_comp_err(struct isert_conn *isert_conn)
1957 {
1958         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1959         struct iscsi_conn *conn = isert_conn->conn;
1960
1961         if (isert_conn->post_recv_buf_count)
1962                 return;
1963
1964         isert_cq_drain_comp_llist(isert_conn, ib_dev);
1965
1966         if (conn->sess) {
1967                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
1968                 target_wait_for_sess_cmds(conn->sess->se_sess);
1969         }
1970
1971         while (atomic_read(&isert_conn->post_send_buf_count))
1972                 msleep(3000);
1973
1974         mutex_lock(&isert_conn->conn_mutex);
1975         isert_conn->state = ISER_CONN_DOWN;
1976         mutex_unlock(&isert_conn->conn_mutex);
1977
1978         complete(&isert_conn->conn_wait_comp_err);
1979 }
1980
1981 static void
1982 isert_cq_tx_work(struct work_struct *work)
1983 {
1984         struct isert_cq_desc *cq_desc = container_of(work,
1985                                 struct isert_cq_desc, cq_tx_work);
1986         struct isert_device *device = cq_desc->device;
1987         int cq_index = cq_desc->cq_index;
1988         struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
1989         struct isert_conn *isert_conn;
1990         struct iser_tx_desc *tx_desc;
1991         struct ib_wc wc;
1992
1993         while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
1994                 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
1995                 isert_conn = wc.qp->qp_context;
1996
1997                 if (wc.status == IB_WC_SUCCESS) {
1998                         isert_send_completion(tx_desc, isert_conn);
1999                 } else {
2000                         pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2001                         pr_debug("TX wc.status: 0x%08x\n", wc.status);
2002                         pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
2003
2004                         if (wc.wr_id != ISER_FASTREG_LI_WRID) {
2005                                 if (tx_desc->llnode_active)
2006                                         continue;
2007
2008                                 atomic_dec(&isert_conn->post_send_buf_count);
2009                                 isert_cq_tx_comp_err(tx_desc, isert_conn);
2010                         }
2011                 }
2012         }
2013
2014         ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
2015 }
2016
2017 static void
2018 isert_cq_tx_callback(struct ib_cq *cq, void *context)
2019 {
2020         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2021
2022         queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
2023 }
2024
2025 static void
2026 isert_cq_rx_work(struct work_struct *work)
2027 {
2028         struct isert_cq_desc *cq_desc = container_of(work,
2029                         struct isert_cq_desc, cq_rx_work);
2030         struct isert_device *device = cq_desc->device;
2031         int cq_index = cq_desc->cq_index;
2032         struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
2033         struct isert_conn *isert_conn;
2034         struct iser_rx_desc *rx_desc;
2035         struct ib_wc wc;
2036         unsigned long xfer_len;
2037
2038         while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
2039                 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
2040                 isert_conn = wc.qp->qp_context;
2041
2042                 if (wc.status == IB_WC_SUCCESS) {
2043                         xfer_len = (unsigned long)wc.byte_len;
2044                         isert_rx_completion(rx_desc, isert_conn, xfer_len);
2045                 } else {
2046                         pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2047                         if (wc.status != IB_WC_WR_FLUSH_ERR) {
2048                                 pr_debug("RX wc.status: 0x%08x\n", wc.status);
2049                                 pr_debug("RX wc.vendor_err: 0x%08x\n",
2050                                          wc.vendor_err);
2051                         }
2052                         isert_conn->post_recv_buf_count--;
2053                         isert_cq_rx_comp_err(isert_conn);
2054                 }
2055         }
2056
2057         ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
2058 }
2059
2060 static void
2061 isert_cq_rx_callback(struct ib_cq *cq, void *context)
2062 {
2063         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2064
2065         queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
2066 }
2067
2068 static int
2069 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2070 {
2071         struct ib_send_wr *wr_failed;
2072         int ret;
2073
2074         atomic_inc(&isert_conn->post_send_buf_count);
2075
2076         ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
2077                            &wr_failed);
2078         if (ret) {
2079                 pr_err("ib_post_send failed with %d\n", ret);
2080                 atomic_dec(&isert_conn->post_send_buf_count);
2081                 return ret;
2082         }
2083         return ret;
2084 }
2085
2086 static int
2087 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2088 {
2089         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2090         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2091         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2092         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2093                                 &isert_cmd->tx_desc.iscsi_header;
2094
2095         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2096         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2097         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2098         /*
2099          * Attach SENSE DATA payload to iSCSI Response PDU
2100          */
2101         if (cmd->se_cmd.sense_buffer &&
2102             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2103             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2104                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2105                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2106                 u32 padding, pdu_len;
2107
2108                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2109                                    cmd->sense_buffer);
2110                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2111
2112                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2113                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2114                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2115
2116                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2117                                 (void *)cmd->sense_buffer, pdu_len,
2118                                 DMA_TO_DEVICE);
2119
2120                 isert_cmd->pdu_buf_len = pdu_len;
2121                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2122                 tx_dsg->length  = pdu_len;
2123                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2124                 isert_cmd->tx_desc.num_sge = 2;
2125         }
2126
2127         isert_init_send_wr(isert_conn, isert_cmd, send_wr, true);
2128
2129         pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2130
2131         return isert_post_response(isert_conn, isert_cmd);
2132 }
2133
2134 static int
2135 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2136                 bool nopout_response)
2137 {
2138         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2139         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2140         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2141
2142         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2143         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2144                                &isert_cmd->tx_desc.iscsi_header,
2145                                nopout_response);
2146         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2147         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2148
2149         pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2150
2151         return isert_post_response(isert_conn, isert_cmd);
2152 }
2153
2154 static int
2155 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2156 {
2157         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2158         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2159         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2160
2161         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2162         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2163                                 &isert_cmd->tx_desc.iscsi_header);
2164         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2165         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2166
2167         pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2168
2169         return isert_post_response(isert_conn, isert_cmd);
2170 }
2171
2172 static int
2173 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2174 {
2175         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2176         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2177         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2178
2179         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2180         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2181                                   &isert_cmd->tx_desc.iscsi_header);
2182         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2183         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2184
2185         pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2186
2187         return isert_post_response(isert_conn, isert_cmd);
2188 }
2189
2190 static int
2191 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2192 {
2193         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2194         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2195         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2196         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2197         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2198         struct iscsi_reject *hdr =
2199                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2200
2201         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2202         iscsit_build_reject(cmd, conn, hdr);
2203         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2204
2205         hton24(hdr->dlength, ISCSI_HDR_LEN);
2206         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2207                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2208                         DMA_TO_DEVICE);
2209         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2210         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2211         tx_dsg->length  = ISCSI_HDR_LEN;
2212         tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2213         isert_cmd->tx_desc.num_sge = 2;
2214
2215         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2216
2217         pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2218
2219         return isert_post_response(isert_conn, isert_cmd);
2220 }
2221
2222 static int
2223 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2224 {
2225         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2226         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2227         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2228         struct iscsi_text_rsp *hdr =
2229                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2230         u32 txt_rsp_len;
2231         int rc;
2232
2233         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2234         rc = iscsit_build_text_rsp(cmd, conn, hdr);
2235         if (rc < 0)
2236                 return rc;
2237
2238         txt_rsp_len = rc;
2239         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2240
2241         if (txt_rsp_len) {
2242                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2243                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2244                 void *txt_rsp_buf = cmd->buf_ptr;
2245
2246                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2247                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2248
2249                 isert_cmd->pdu_buf_len = txt_rsp_len;
2250                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2251                 tx_dsg->length  = txt_rsp_len;
2252                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2253                 isert_cmd->tx_desc.num_sge = 2;
2254         }
2255         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2256
2257         pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2258
2259         return isert_post_response(isert_conn, isert_cmd);
2260 }
2261
2262 static int
2263 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2264                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2265                     u32 data_left, u32 offset)
2266 {
2267         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2268         struct scatterlist *sg_start, *tmp_sg;
2269         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2270         u32 sg_off, page_off;
2271         int i = 0, sg_nents;
2272
2273         sg_off = offset / PAGE_SIZE;
2274         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2275         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2276         page_off = offset % PAGE_SIZE;
2277
2278         send_wr->sg_list = ib_sge;
2279         send_wr->num_sge = sg_nents;
2280         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2281         /*
2282          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2283          */
2284         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2285                 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2286                          (unsigned long long)tmp_sg->dma_address,
2287                          tmp_sg->length, page_off);
2288
2289                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2290                 ib_sge->length = min_t(u32, data_left,
2291                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2292                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2293
2294                 pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2295                          ib_sge->addr, ib_sge->length, ib_sge->lkey);
2296                 page_off = 0;
2297                 data_left -= ib_sge->length;
2298                 ib_sge++;
2299                 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2300         }
2301
2302         pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2303                  send_wr->sg_list, send_wr->num_sge);
2304
2305         return sg_nents;
2306 }
2307
2308 static int
2309 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2310                struct isert_rdma_wr *wr)
2311 {
2312         struct se_cmd *se_cmd = &cmd->se_cmd;
2313         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2314         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2315         struct isert_data_buf *data = &wr->data;
2316         struct ib_send_wr *send_wr;
2317         struct ib_sge *ib_sge;
2318         u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2319         int ret = 0, i, ib_sge_cnt;
2320
2321         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2322
2323         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2324         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2325                                  se_cmd->t_data_nents, se_cmd->data_length,
2326                                  offset, wr->iser_ib_op, &wr->data);
2327         if (ret)
2328                 return ret;
2329
2330         data_left = data->len;
2331         offset = data->offset;
2332
2333         ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2334         if (!ib_sge) {
2335                 pr_warn("Unable to allocate ib_sge\n");
2336                 ret = -ENOMEM;
2337                 goto unmap_cmd;
2338         }
2339         wr->ib_sge = ib_sge;
2340
2341         wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2342         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2343                                 GFP_KERNEL);
2344         if (!wr->send_wr) {
2345                 pr_debug("Unable to allocate wr->send_wr\n");
2346                 ret = -ENOMEM;
2347                 goto unmap_cmd;
2348         }
2349
2350         wr->isert_cmd = isert_cmd;
2351         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2352
2353         for (i = 0; i < wr->send_wr_num; i++) {
2354                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2355                 data_len = min(data_left, rdma_write_max);
2356
2357                 send_wr->send_flags = 0;
2358                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2359                         send_wr->opcode = IB_WR_RDMA_WRITE;
2360                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2361                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2362                         if (i + 1 == wr->send_wr_num)
2363                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2364                         else
2365                                 send_wr->next = &wr->send_wr[i + 1];
2366                 } else {
2367                         send_wr->opcode = IB_WR_RDMA_READ;
2368                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2369                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2370                         if (i + 1 == wr->send_wr_num)
2371                                 send_wr->send_flags = IB_SEND_SIGNALED;
2372                         else
2373                                 send_wr->next = &wr->send_wr[i + 1];
2374                 }
2375
2376                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2377                                         send_wr, data_len, offset);
2378                 ib_sge += ib_sge_cnt;
2379
2380                 offset += data_len;
2381                 va_offset += data_len;
2382                 data_left -= data_len;
2383         }
2384
2385         return 0;
2386 unmap_cmd:
2387         isert_unmap_data_buf(isert_conn, data);
2388
2389         return ret;
2390 }
2391
2392 static int
2393 isert_map_fr_pagelist(struct ib_device *ib_dev,
2394                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2395 {
2396         u64 start_addr, end_addr, page, chunk_start = 0;
2397         struct scatterlist *tmp_sg;
2398         int i = 0, new_chunk, last_ent, n_pages;
2399
2400         n_pages = 0;
2401         new_chunk = 1;
2402         last_ent = sg_nents - 1;
2403         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2404                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2405                 if (new_chunk)
2406                         chunk_start = start_addr;
2407                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2408
2409                 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2410                          i, (unsigned long long)tmp_sg->dma_address,
2411                          tmp_sg->length);
2412
2413                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2414                         new_chunk = 0;
2415                         continue;
2416                 }
2417                 new_chunk = 1;
2418
2419                 page = chunk_start & PAGE_MASK;
2420                 do {
2421                         fr_pl[n_pages++] = page;
2422                         pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2423                                  n_pages - 1, page);
2424                         page += PAGE_SIZE;
2425                 } while (page < end_addr);
2426         }
2427
2428         return n_pages;
2429 }
2430
2431 static int
2432 isert_fast_reg_mr(struct isert_conn *isert_conn,
2433                   struct fast_reg_descriptor *fr_desc,
2434                   struct isert_data_buf *mem,
2435                   enum isert_indicator ind,
2436                   struct ib_sge *sge)
2437 {
2438         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2439         struct ib_mr *mr;
2440         struct ib_fast_reg_page_list *frpl;
2441         struct ib_send_wr fr_wr, inv_wr;
2442         struct ib_send_wr *bad_wr, *wr = NULL;
2443         int ret, pagelist_len;
2444         u32 page_off;
2445         u8 key;
2446
2447         if (mem->dma_nents == 1) {
2448                 sge->lkey = isert_conn->conn_mr->lkey;
2449                 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2450                 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2451                 pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2452                          __func__, __LINE__, sge->addr, sge->length,
2453                          sge->lkey);
2454                 return 0;
2455         }
2456
2457         if (ind == ISERT_DATA_KEY_VALID) {
2458                 /* Registering data buffer */
2459                 mr = fr_desc->data_mr;
2460                 frpl = fr_desc->data_frpl;
2461         } else {
2462                 /* Registering protection buffer */
2463                 mr = fr_desc->pi_ctx->prot_mr;
2464                 frpl = fr_desc->pi_ctx->prot_frpl;
2465         }
2466
2467         page_off = mem->offset % PAGE_SIZE;
2468
2469         pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2470                  fr_desc, mem->nents, mem->offset);
2471
2472         pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2473                                              &frpl->page_list[0]);
2474
2475         if (!(fr_desc->ind & ISERT_DATA_KEY_VALID)) {
2476                 memset(&inv_wr, 0, sizeof(inv_wr));
2477                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2478                 inv_wr.opcode = IB_WR_LOCAL_INV;
2479                 inv_wr.ex.invalidate_rkey = mr->rkey;
2480                 wr = &inv_wr;
2481                 /* Bump the key */
2482                 key = (u8)(mr->rkey & 0x000000FF);
2483                 ib_update_fast_reg_key(mr, ++key);
2484         }
2485
2486         /* Prepare FASTREG WR */
2487         memset(&fr_wr, 0, sizeof(fr_wr));
2488         fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2489         fr_wr.opcode = IB_WR_FAST_REG_MR;
2490         fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2491         fr_wr.wr.fast_reg.page_list = frpl;
2492         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2493         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2494         fr_wr.wr.fast_reg.length = mem->len;
2495         fr_wr.wr.fast_reg.rkey = mr->rkey;
2496         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2497
2498         if (!wr)
2499                 wr = &fr_wr;
2500         else
2501                 wr->next = &fr_wr;
2502
2503         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2504         if (ret) {
2505                 pr_err("fast registration failed, ret:%d\n", ret);
2506                 return ret;
2507         }
2508         fr_desc->ind &= ~ind;
2509
2510         sge->lkey = mr->lkey;
2511         sge->addr = frpl->page_list[0] + page_off;
2512         sge->length = mem->len;
2513
2514         pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2515                  __func__, __LINE__, sge->addr, sge->length,
2516                  sge->lkey);
2517
2518         return ret;
2519 }
2520
2521 static inline enum ib_t10_dif_type
2522 se2ib_prot_type(enum target_prot_type prot_type)
2523 {
2524         switch (prot_type) {
2525         case TARGET_DIF_TYPE0_PROT:
2526                 return IB_T10DIF_NONE;
2527         case TARGET_DIF_TYPE1_PROT:
2528                 return IB_T10DIF_TYPE1;
2529         case TARGET_DIF_TYPE2_PROT:
2530                 return IB_T10DIF_TYPE2;
2531         case TARGET_DIF_TYPE3_PROT:
2532                 return IB_T10DIF_TYPE3;
2533         default:
2534                 return IB_T10DIF_NONE;
2535         }
2536 }
2537
2538 static int
2539 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2540 {
2541         enum ib_t10_dif_type ib_prot_type = se2ib_prot_type(se_cmd->prot_type);
2542
2543         sig_attrs->mem.sig_type = IB_SIG_TYPE_T10_DIF;
2544         sig_attrs->wire.sig_type = IB_SIG_TYPE_T10_DIF;
2545         sig_attrs->mem.sig.dif.pi_interval =
2546                                 se_cmd->se_dev->dev_attrib.block_size;
2547         sig_attrs->wire.sig.dif.pi_interval =
2548                                 se_cmd->se_dev->dev_attrib.block_size;
2549
2550         switch (se_cmd->prot_op) {
2551         case TARGET_PROT_DIN_INSERT:
2552         case TARGET_PROT_DOUT_STRIP:
2553                 sig_attrs->mem.sig.dif.type = IB_T10DIF_NONE;
2554                 sig_attrs->wire.sig.dif.type = ib_prot_type;
2555                 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
2556                 sig_attrs->wire.sig.dif.ref_tag = se_cmd->reftag_seed;
2557                 break;
2558         case TARGET_PROT_DOUT_INSERT:
2559         case TARGET_PROT_DIN_STRIP:
2560                 sig_attrs->mem.sig.dif.type = ib_prot_type;
2561                 sig_attrs->mem.sig.dif.bg_type = IB_T10DIF_CRC;
2562                 sig_attrs->mem.sig.dif.ref_tag = se_cmd->reftag_seed;
2563                 sig_attrs->wire.sig.dif.type = IB_T10DIF_NONE;
2564                 break;
2565         case TARGET_PROT_DIN_PASS:
2566         case TARGET_PROT_DOUT_PASS:
2567                 sig_attrs->mem.sig.dif.type = ib_prot_type;
2568                 sig_attrs->mem.sig.dif.bg_type = IB_T10DIF_CRC;
2569                 sig_attrs->mem.sig.dif.ref_tag = se_cmd->reftag_seed;
2570                 sig_attrs->wire.sig.dif.type = ib_prot_type;
2571                 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
2572                 sig_attrs->wire.sig.dif.ref_tag = se_cmd->reftag_seed;
2573                 break;
2574         default:
2575                 pr_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2576                 return -EINVAL;
2577         }
2578
2579         return 0;
2580 }
2581
2582 static inline u8
2583 isert_set_prot_checks(u8 prot_checks)
2584 {
2585         return (prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2586                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2587                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2588 }
2589
2590 static int
2591 isert_reg_sig_mr(struct isert_conn *isert_conn, struct se_cmd *se_cmd,
2592                  struct fast_reg_descriptor *fr_desc,
2593                  struct ib_sge *data_sge, struct ib_sge *prot_sge,
2594                  struct ib_sge *sig_sge)
2595 {
2596         struct ib_send_wr sig_wr, inv_wr;
2597         struct ib_send_wr *bad_wr, *wr = NULL;
2598         struct pi_context *pi_ctx = fr_desc->pi_ctx;
2599         struct ib_sig_attrs sig_attrs;
2600         int ret;
2601         u32 key;
2602
2603         memset(&sig_attrs, 0, sizeof(sig_attrs));
2604         ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2605         if (ret)
2606                 goto err;
2607
2608         sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2609
2610         if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2611                 memset(&inv_wr, 0, sizeof(inv_wr));
2612                 inv_wr.opcode = IB_WR_LOCAL_INV;
2613                 inv_wr.ex.invalidate_rkey = pi_ctx->sig_mr->rkey;
2614                 wr = &inv_wr;
2615                 /* Bump the key */
2616                 key = (u8)(pi_ctx->sig_mr->rkey & 0x000000FF);
2617                 ib_update_fast_reg_key(pi_ctx->sig_mr, ++key);
2618         }
2619
2620         memset(&sig_wr, 0, sizeof(sig_wr));
2621         sig_wr.opcode = IB_WR_REG_SIG_MR;
2622         sig_wr.sg_list = data_sge;
2623         sig_wr.num_sge = 1;
2624         sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2625         sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2626         sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2627         if (se_cmd->t_prot_sg)
2628                 sig_wr.wr.sig_handover.prot = prot_sge;
2629
2630         if (!wr)
2631                 wr = &sig_wr;
2632         else
2633                 wr->next = &sig_wr;
2634
2635         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2636         if (ret) {
2637                 pr_err("fast registration failed, ret:%d\n", ret);
2638                 goto err;
2639         }
2640         fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2641
2642         sig_sge->lkey = pi_ctx->sig_mr->lkey;
2643         sig_sge->addr = 0;
2644         sig_sge->length = se_cmd->data_length;
2645         if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2646             se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2647                 /*
2648                  * We have protection guards on the wire
2649                  * so we need to set a larget transfer
2650                  */
2651                 sig_sge->length += se_cmd->prot_length;
2652
2653         pr_debug("sig_sge: addr: 0x%llx  length: %u lkey: %x\n",
2654                  sig_sge->addr, sig_sge->length,
2655                  sig_sge->lkey);
2656 err:
2657         return ret;
2658 }
2659
2660 static int
2661 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2662                struct isert_rdma_wr *wr)
2663 {
2664         struct se_cmd *se_cmd = &cmd->se_cmd;
2665         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2666         struct isert_conn *isert_conn = conn->context;
2667         struct ib_sge data_sge;
2668         struct ib_send_wr *send_wr;
2669         struct fast_reg_descriptor *fr_desc = NULL;
2670         u32 offset;
2671         int ret = 0;
2672         unsigned long flags;
2673
2674         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2675
2676         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2677         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2678                                  se_cmd->t_data_nents, se_cmd->data_length,
2679                                  offset, wr->iser_ib_op, &wr->data);
2680         if (ret)
2681                 return ret;
2682
2683         if (wr->data.dma_nents != 1 ||
2684             se_cmd->prot_op != TARGET_PROT_NORMAL) {
2685                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2686                 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2687                                            struct fast_reg_descriptor, list);
2688                 list_del(&fr_desc->list);
2689                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2690                 wr->fr_desc = fr_desc;
2691         }
2692
2693         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2694                                 ISERT_DATA_KEY_VALID, &data_sge);
2695         if (ret)
2696                 goto unmap_cmd;
2697
2698         if (se_cmd->prot_op != TARGET_PROT_NORMAL) {
2699                 struct ib_sge prot_sge, sig_sge;
2700
2701                 if (se_cmd->t_prot_sg) {
2702                         ret = isert_map_data_buf(isert_conn, isert_cmd,
2703                                                  se_cmd->t_prot_sg,
2704                                                  se_cmd->t_prot_nents,
2705                                                  se_cmd->prot_length,
2706                                                  0, wr->iser_ib_op, &wr->prot);
2707                         if (ret)
2708                                 goto unmap_cmd;
2709
2710                         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->prot,
2711                                                 ISERT_PROT_KEY_VALID, &prot_sge);
2712                         if (ret)
2713                                 goto unmap_prot_cmd;
2714                 }
2715
2716                 ret = isert_reg_sig_mr(isert_conn, se_cmd, fr_desc,
2717                                        &data_sge, &prot_sge, &sig_sge);
2718                 if (ret)
2719                         goto unmap_prot_cmd;
2720
2721                 fr_desc->ind |= ISERT_PROTECTED;
2722                 memcpy(&wr->s_ib_sge, &sig_sge, sizeof(sig_sge));
2723         } else
2724                 memcpy(&wr->s_ib_sge, &data_sge, sizeof(data_sge));
2725
2726         wr->ib_sge = &wr->s_ib_sge;
2727         wr->send_wr_num = 1;
2728         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2729         wr->send_wr = &wr->s_send_wr;
2730         wr->isert_cmd = isert_cmd;
2731
2732         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2733         send_wr->sg_list = &wr->s_ib_sge;
2734         send_wr->num_sge = 1;
2735         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2736         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2737                 send_wr->opcode = IB_WR_RDMA_WRITE;
2738                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2739                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2740                 send_wr->send_flags = se_cmd->prot_op == TARGET_PROT_NORMAL ?
2741                                       0 : IB_SEND_SIGNALED;
2742         } else {
2743                 send_wr->opcode = IB_WR_RDMA_READ;
2744                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2745                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2746                 send_wr->send_flags = IB_SEND_SIGNALED;
2747         }
2748
2749         return 0;
2750 unmap_prot_cmd:
2751         if (se_cmd->t_prot_sg)
2752                 isert_unmap_data_buf(isert_conn, &wr->prot);
2753 unmap_cmd:
2754         if (fr_desc) {
2755                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2756                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2757                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2758         }
2759         isert_unmap_data_buf(isert_conn, &wr->data);
2760
2761         return ret;
2762 }
2763
2764 static int
2765 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2766 {
2767         struct se_cmd *se_cmd = &cmd->se_cmd;
2768         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2769         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2770         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2771         struct isert_device *device = isert_conn->conn_device;
2772         struct ib_send_wr *wr_failed;
2773         int rc;
2774
2775         pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2776                  isert_cmd, se_cmd->data_length);
2777         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2778         rc = device->reg_rdma_mem(conn, cmd, wr);
2779         if (rc) {
2780                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2781                 return rc;
2782         }
2783
2784         if (se_cmd->prot_op == TARGET_PROT_NORMAL) {
2785                 /*
2786                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2787                  */
2788                 isert_create_send_desc(isert_conn, isert_cmd,
2789                                        &isert_cmd->tx_desc);
2790                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2791                                      &isert_cmd->tx_desc.iscsi_header);
2792                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2793                 isert_init_send_wr(isert_conn, isert_cmd,
2794                                    &isert_cmd->tx_desc.send_wr, true);
2795                 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2796         }
2797
2798         atomic_add(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
2799
2800         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2801         if (rc) {
2802                 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2803                 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
2804         }
2805
2806         if (se_cmd->prot_op == TARGET_PROT_NORMAL)
2807                 pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2808                          "READ\n", isert_cmd);
2809         else
2810                 pr_debug("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2811                          isert_cmd);
2812
2813         return 1;
2814 }
2815
2816 static int
2817 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2818 {
2819         struct se_cmd *se_cmd = &cmd->se_cmd;
2820         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2821         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2822         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2823         struct isert_device *device = isert_conn->conn_device;
2824         struct ib_send_wr *wr_failed;
2825         int rc;
2826
2827         pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2828                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2829         wr->iser_ib_op = ISER_IB_RDMA_READ;
2830         rc = device->reg_rdma_mem(conn, cmd, wr);
2831         if (rc) {
2832                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2833                 return rc;
2834         }
2835
2836         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2837
2838         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2839         if (rc) {
2840                 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2841                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2842         }
2843         pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2844                  isert_cmd);
2845
2846         return 0;
2847 }
2848
2849 static int
2850 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2851 {
2852         int ret;
2853
2854         switch (state) {
2855         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2856                 ret = isert_put_nopin(cmd, conn, false);
2857                 break;
2858         default:
2859                 pr_err("Unknown immediate state: 0x%02x\n", state);
2860                 ret = -EINVAL;
2861                 break;
2862         }
2863
2864         return ret;
2865 }
2866
2867 static int
2868 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2869 {
2870         int ret;
2871
2872         switch (state) {
2873         case ISTATE_SEND_LOGOUTRSP:
2874                 ret = isert_put_logout_rsp(cmd, conn);
2875                 if (!ret) {
2876                         pr_debug("Returning iSER Logout -EAGAIN\n");
2877                         ret = -EAGAIN;
2878                 }
2879                 break;
2880         case ISTATE_SEND_NOPIN:
2881                 ret = isert_put_nopin(cmd, conn, true);
2882                 break;
2883         case ISTATE_SEND_TASKMGTRSP:
2884                 ret = isert_put_tm_rsp(cmd, conn);
2885                 break;
2886         case ISTATE_SEND_REJECT:
2887                 ret = isert_put_reject(cmd, conn);
2888                 break;
2889         case ISTATE_SEND_TEXTRSP:
2890                 ret = isert_put_text_rsp(cmd, conn);
2891                 break;
2892         case ISTATE_SEND_STATUS:
2893                 /*
2894                  * Special case for sending non GOOD SCSI status from TX thread
2895                  * context during pre se_cmd excecution failure.
2896                  */
2897                 ret = isert_put_response(conn, cmd);
2898                 break;
2899         default:
2900                 pr_err("Unknown response state: 0x%02x\n", state);
2901                 ret = -EINVAL;
2902                 break;
2903         }
2904
2905         return ret;
2906 }
2907
2908 static int
2909 isert_setup_np(struct iscsi_np *np,
2910                struct __kernel_sockaddr_storage *ksockaddr)
2911 {
2912         struct isert_np *isert_np;
2913         struct rdma_cm_id *isert_lid;
2914         struct sockaddr *sa;
2915         int ret;
2916
2917         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2918         if (!isert_np) {
2919                 pr_err("Unable to allocate struct isert_np\n");
2920                 return -ENOMEM;
2921         }
2922         init_waitqueue_head(&isert_np->np_accept_wq);
2923         mutex_init(&isert_np->np_accept_mutex);
2924         INIT_LIST_HEAD(&isert_np->np_accept_list);
2925         init_completion(&isert_np->np_login_comp);
2926
2927         sa = (struct sockaddr *)ksockaddr;
2928         pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
2929         /*
2930          * Setup the np->np_sockaddr from the passed sockaddr setup
2931          * in iscsi_target_configfs.c code..
2932          */
2933         memcpy(&np->np_sockaddr, ksockaddr,
2934                sizeof(struct __kernel_sockaddr_storage));
2935
2936         isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
2937                                 IB_QPT_RC);
2938         if (IS_ERR(isert_lid)) {
2939                 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
2940                        PTR_ERR(isert_lid));
2941                 ret = PTR_ERR(isert_lid);
2942                 goto out;
2943         }
2944
2945         ret = rdma_bind_addr(isert_lid, sa);
2946         if (ret) {
2947                 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
2948                 goto out_lid;
2949         }
2950
2951         ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
2952         if (ret) {
2953                 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
2954                 goto out_lid;
2955         }
2956
2957         isert_np->np_cm_id = isert_lid;
2958         np->np_context = isert_np;
2959         pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
2960
2961         return 0;
2962
2963 out_lid:
2964         rdma_destroy_id(isert_lid);
2965 out:
2966         kfree(isert_np);
2967         return ret;
2968 }
2969
2970 static int
2971 isert_check_accept_queue(struct isert_np *isert_np)
2972 {
2973         int empty;
2974
2975         mutex_lock(&isert_np->np_accept_mutex);
2976         empty = list_empty(&isert_np->np_accept_list);
2977         mutex_unlock(&isert_np->np_accept_mutex);
2978
2979         return empty;
2980 }
2981
2982 static int
2983 isert_rdma_accept(struct isert_conn *isert_conn)
2984 {
2985         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2986         struct rdma_conn_param cp;
2987         int ret;
2988
2989         memset(&cp, 0, sizeof(struct rdma_conn_param));
2990         cp.responder_resources = isert_conn->responder_resources;
2991         cp.initiator_depth = isert_conn->initiator_depth;
2992         cp.retry_count = 7;
2993         cp.rnr_retry_count = 7;
2994
2995         pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
2996
2997         ret = rdma_accept(cm_id, &cp);
2998         if (ret) {
2999                 pr_err("rdma_accept() failed with: %d\n", ret);
3000                 return ret;
3001         }
3002
3003         pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
3004
3005         return 0;
3006 }
3007
3008 static int
3009 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3010 {
3011         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
3012         int ret;
3013
3014         pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
3015         /*
3016          * For login requests after the first PDU, isert_rx_login_req() will
3017          * kick schedule_delayed_work(&conn->login_work) as the packet is
3018          * received, which turns this callback from iscsi_target_do_login_rx()
3019          * into a NOP.
3020          */
3021         if (!login->first_request)
3022                 return 0;
3023
3024         ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
3025         if (ret)
3026                 return ret;
3027
3028         pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
3029         return 0;
3030 }
3031
3032 static void
3033 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3034                     struct isert_conn *isert_conn)
3035 {
3036         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3037         struct rdma_route *cm_route = &cm_id->route;
3038         struct sockaddr_in *sock_in;
3039         struct sockaddr_in6 *sock_in6;
3040
3041         conn->login_family = np->np_sockaddr.ss_family;
3042
3043         if (np->np_sockaddr.ss_family == AF_INET6) {
3044                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3045                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3046                          &sock_in6->sin6_addr.in6_u);
3047                 conn->login_port = ntohs(sock_in6->sin6_port);
3048
3049                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3050                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3051                          &sock_in6->sin6_addr.in6_u);
3052                 conn->local_port = ntohs(sock_in6->sin6_port);
3053         } else {
3054                 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3055                 sprintf(conn->login_ip, "%pI4",
3056                         &sock_in->sin_addr.s_addr);
3057                 conn->login_port = ntohs(sock_in->sin_port);
3058
3059                 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3060                 sprintf(conn->local_ip, "%pI4",
3061                         &sock_in->sin_addr.s_addr);
3062                 conn->local_port = ntohs(sock_in->sin_port);
3063         }
3064 }
3065
3066 static int
3067 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3068 {
3069         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3070         struct isert_conn *isert_conn;
3071         int max_accept = 0, ret;
3072
3073 accept_wait:
3074         ret = wait_event_interruptible(isert_np->np_accept_wq,
3075                         !isert_check_accept_queue(isert_np) ||
3076                         np->np_thread_state == ISCSI_NP_THREAD_RESET);
3077         if (max_accept > 5)
3078                 return -ENODEV;
3079
3080         spin_lock_bh(&np->np_thread_lock);
3081         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
3082                 spin_unlock_bh(&np->np_thread_lock);
3083                 pr_err("ISCSI_NP_THREAD_RESET for isert_accept_np\n");
3084                 return -ENODEV;
3085         }
3086         spin_unlock_bh(&np->np_thread_lock);
3087
3088         mutex_lock(&isert_np->np_accept_mutex);
3089         if (list_empty(&isert_np->np_accept_list)) {
3090                 mutex_unlock(&isert_np->np_accept_mutex);
3091                 max_accept++;
3092                 goto accept_wait;
3093         }
3094         isert_conn = list_first_entry(&isert_np->np_accept_list,
3095                         struct isert_conn, conn_accept_node);
3096         list_del_init(&isert_conn->conn_accept_node);
3097         mutex_unlock(&isert_np->np_accept_mutex);
3098
3099         conn->context = isert_conn;
3100         isert_conn->conn = conn;
3101         max_accept = 0;
3102
3103         ret = isert_rdma_post_recvl(isert_conn);
3104         if (ret)
3105                 return ret;
3106
3107         ret = isert_rdma_accept(isert_conn);
3108         if (ret)
3109                 return ret;
3110
3111         isert_set_conn_info(np, conn, isert_conn);
3112
3113         pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
3114         return 0;
3115 }
3116
3117 static void
3118 isert_free_np(struct iscsi_np *np)
3119 {
3120         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3121
3122         rdma_destroy_id(isert_np->np_cm_id);
3123
3124         np->np_context = NULL;
3125         kfree(isert_np);
3126 }
3127
3128 static void isert_wait_conn(struct iscsi_conn *conn)
3129 {
3130         struct isert_conn *isert_conn = conn->context;
3131
3132         pr_debug("isert_wait_conn: Starting \n");
3133         /*
3134          * Decrement post_send_buf_count for special case when called
3135          * from isert_do_control_comp() -> iscsit_logout_post_handler()
3136          */
3137         mutex_lock(&isert_conn->conn_mutex);
3138         if (isert_conn->logout_posted)
3139                 atomic_dec(&isert_conn->post_send_buf_count);
3140
3141         if (isert_conn->conn_cm_id && isert_conn->state != ISER_CONN_DOWN) {
3142                 pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
3143                 rdma_disconnect(isert_conn->conn_cm_id);
3144         }
3145         /*
3146          * Only wait for conn_wait_comp_err if the isert_conn made it
3147          * into full feature phase..
3148          */
3149         if (isert_conn->state == ISER_CONN_INIT) {
3150                 mutex_unlock(&isert_conn->conn_mutex);
3151                 return;
3152         }
3153         if (isert_conn->state == ISER_CONN_UP)
3154                 isert_conn->state = ISER_CONN_TERMINATING;
3155         mutex_unlock(&isert_conn->conn_mutex);
3156
3157         wait_for_completion(&isert_conn->conn_wait_comp_err);
3158
3159         wait_for_completion(&isert_conn->conn_wait);
3160 }
3161
3162 static void isert_free_conn(struct iscsi_conn *conn)
3163 {
3164         struct isert_conn *isert_conn = conn->context;
3165
3166         isert_put_conn(isert_conn);
3167 }
3168
3169 static struct iscsit_transport iser_target_transport = {
3170         .name                   = "IB/iSER",
3171         .transport_type         = ISCSI_INFINIBAND,
3172         .priv_size              = sizeof(struct isert_cmd),
3173         .owner                  = THIS_MODULE,
3174         .iscsit_setup_np        = isert_setup_np,
3175         .iscsit_accept_np       = isert_accept_np,
3176         .iscsit_free_np         = isert_free_np,
3177         .iscsit_wait_conn       = isert_wait_conn,
3178         .iscsit_free_conn       = isert_free_conn,
3179         .iscsit_get_login_rx    = isert_get_login_rx,
3180         .iscsit_put_login_tx    = isert_put_login_tx,
3181         .iscsit_immediate_queue = isert_immediate_queue,
3182         .iscsit_response_queue  = isert_response_queue,
3183         .iscsit_get_dataout     = isert_get_dataout,
3184         .iscsit_queue_data_in   = isert_put_datain,
3185         .iscsit_queue_status    = isert_put_response,
3186 };
3187
3188 static int __init isert_init(void)
3189 {
3190         int ret;
3191
3192         isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
3193         if (!isert_rx_wq) {
3194                 pr_err("Unable to allocate isert_rx_wq\n");
3195                 return -ENOMEM;
3196         }
3197
3198         isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
3199         if (!isert_comp_wq) {
3200                 pr_err("Unable to allocate isert_comp_wq\n");
3201                 ret = -ENOMEM;
3202                 goto destroy_rx_wq;
3203         }
3204
3205         iscsit_register_transport(&iser_target_transport);
3206         pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
3207         return 0;
3208
3209 destroy_rx_wq:
3210         destroy_workqueue(isert_rx_wq);
3211         return ret;
3212 }
3213
3214 static void __exit isert_exit(void)
3215 {
3216         destroy_workqueue(isert_comp_wq);
3217         destroy_workqueue(isert_rx_wq);
3218         iscsit_unregister_transport(&iser_target_transport);
3219         pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
3220 }
3221
3222 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3223 MODULE_VERSION("0.1");
3224 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3225 MODULE_LICENSE("GPL");
3226
3227 module_init(isert_init);
3228 module_exit(isert_exit);