1 /* 2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. 3 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 #include <linux/kernel.h> 34 #include <linux/slab.h> 35 #include <linux/mm.h> 36 #include <linux/scatterlist.h> 37 #include <linux/kfifo.h> 38 #include <scsi/scsi_cmnd.h> 39 #include <scsi/scsi_host.h> 40 41 #include "iscsi_iser.h" 42 43 /* Register user buffer memory and initialize passive rdma 44 * dto descriptor. Data size is stored in 45 * task->data[ISER_DIR_IN].data_len, Protection size 46 * os stored in task->prot[ISER_DIR_IN].data_len 47 */ 48 static int iser_prepare_read_cmd(struct iscsi_task *task) 49 50 { 51 struct iscsi_iser_task *iser_task = task->dd_data; 52 struct iser_mem_reg *mem_reg; 53 int err; 54 struct iser_ctrl *hdr = &iser_task->desc.iser_header; 55 56 err = iser_dma_map_task_data(iser_task, 57 ISER_DIR_IN, 58 DMA_FROM_DEVICE); 59 if (err) 60 return err; 61 62 err = iser_reg_mem_fastreg(iser_task, ISER_DIR_IN, false); 63 if (err) { 64 iser_err("Failed to set up Data-IN RDMA\n"); 65 goto out_err; 66 } 67 mem_reg = &iser_task->rdma_reg[ISER_DIR_IN]; 68 69 hdr->flags |= ISER_RSV; 70 hdr->read_stag = cpu_to_be32(mem_reg->rkey); 71 hdr->read_va = cpu_to_be64(mem_reg->sge.addr); 72 73 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n", 74 task->itt, mem_reg->rkey, 75 (unsigned long long)mem_reg->sge.addr); 76 77 return 0; 78 79 out_err: 80 iser_dma_unmap_task_data(iser_task, ISER_DIR_IN, DMA_FROM_DEVICE); 81 return err; 82 } 83 84 /* Register user buffer memory and initialize passive rdma 85 * dto descriptor. Data size is stored in 86 * task->data[ISER_DIR_OUT].data_len, Protection size 87 * is stored at task->prot[ISER_DIR_OUT].data_len 88 */ 89 static int iser_prepare_write_cmd(struct iscsi_task *task, unsigned int imm_sz, 90 unsigned int unsol_sz, unsigned int edtl) 91 { 92 struct iscsi_iser_task *iser_task = task->dd_data; 93 struct iser_mem_reg *mem_reg; 94 int err; 95 struct iser_ctrl *hdr = &iser_task->desc.iser_header; 96 struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT]; 97 struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1]; 98 99 err = iser_dma_map_task_data(iser_task, 100 ISER_DIR_OUT, 101 DMA_TO_DEVICE); 102 if (err) 103 return err; 104 105 err = iser_reg_mem_fastreg(iser_task, ISER_DIR_OUT, 106 buf_out->data_len == imm_sz); 107 if (err) { 108 iser_err("Failed to register write cmd RDMA mem\n"); 109 goto out_err; 110 } 111 112 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT]; 113 114 if (unsol_sz < edtl) { 115 hdr->flags |= ISER_WSV; 116 if (buf_out->data_len > imm_sz) { 117 hdr->write_stag = cpu_to_be32(mem_reg->rkey); 118 hdr->write_va = cpu_to_be64(mem_reg->sge.addr + unsol_sz); 119 } 120 121 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X VA:%#llX + unsol:%d\n", 122 task->itt, mem_reg->rkey, 123 (unsigned long long)mem_reg->sge.addr, unsol_sz); 124 } 125 126 if (imm_sz > 0) { 127 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n", 128 task->itt, imm_sz); 129 tx_dsg->addr = mem_reg->sge.addr; 130 tx_dsg->length = imm_sz; 131 tx_dsg->lkey = mem_reg->sge.lkey; 132 iser_task->desc.num_sge = 2; 133 } 134 135 return 0; 136 137 out_err: 138 iser_dma_unmap_task_data(iser_task, ISER_DIR_OUT, DMA_TO_DEVICE); 139 return err; 140 } 141 142 /* creates a new tx descriptor and adds header regd buffer */ 143 static void iser_create_send_desc(struct iser_conn *iser_conn, 144 struct iser_tx_desc *tx_desc, enum iser_desc_type type, 145 void (*done)(struct ib_cq *cq, struct ib_wc *wc)) 146 { 147 struct iser_device *device = iser_conn->ib_conn.device; 148 149 tx_desc->type = type; 150 tx_desc->cqe.done = done; 151 152 ib_dma_sync_single_for_cpu(device->ib_device, 153 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 154 155 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl)); 156 tx_desc->iser_header.flags = ISER_VER; 157 tx_desc->num_sge = 1; 158 } 159 160 static void iser_free_login_buf(struct iser_conn *iser_conn) 161 { 162 struct iser_device *device = iser_conn->ib_conn.device; 163 struct iser_login_desc *desc = &iser_conn->login_desc; 164 165 if (!desc->req) 166 return; 167 168 ib_dma_unmap_single(device->ib_device, desc->req_dma, 169 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 170 171 ib_dma_unmap_single(device->ib_device, desc->rsp_dma, 172 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 173 174 kfree(desc->req); 175 kfree(desc->rsp); 176 177 /* make sure we never redo any unmapping */ 178 desc->req = NULL; 179 desc->rsp = NULL; 180 } 181 182 static int iser_alloc_login_buf(struct iser_conn *iser_conn) 183 { 184 struct iser_device *device = iser_conn->ib_conn.device; 185 struct iser_login_desc *desc = &iser_conn->login_desc; 186 187 desc->req = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL); 188 if (!desc->req) 189 return -ENOMEM; 190 191 desc->req_dma = ib_dma_map_single(device->ib_device, desc->req, 192 ISCSI_DEF_MAX_RECV_SEG_LEN, 193 DMA_TO_DEVICE); 194 if (ib_dma_mapping_error(device->ib_device, 195 desc->req_dma)) 196 goto free_req; 197 198 desc->rsp = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL); 199 if (!desc->rsp) 200 goto unmap_req; 201 202 desc->rsp_dma = ib_dma_map_single(device->ib_device, desc->rsp, 203 ISER_RX_LOGIN_SIZE, 204 DMA_FROM_DEVICE); 205 if (ib_dma_mapping_error(device->ib_device, 206 desc->rsp_dma)) 207 goto free_rsp; 208 209 return 0; 210 211 free_rsp: 212 kfree(desc->rsp); 213 unmap_req: 214 ib_dma_unmap_single(device->ib_device, desc->req_dma, 215 ISCSI_DEF_MAX_RECV_SEG_LEN, 216 DMA_TO_DEVICE); 217 free_req: 218 kfree(desc->req); 219 220 return -ENOMEM; 221 } 222 223 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, 224 struct iscsi_session *session) 225 { 226 int i, j; 227 u64 dma_addr; 228 struct iser_rx_desc *rx_desc; 229 struct ib_sge *rx_sg; 230 struct ib_conn *ib_conn = &iser_conn->ib_conn; 231 struct iser_device *device = ib_conn->device; 232 233 iser_conn->qp_max_recv_dtos = session->cmds_max; 234 235 if (iser_alloc_fastreg_pool(ib_conn, session->scsi_cmds_max, 236 iser_conn->pages_per_mr)) 237 goto create_rdma_reg_res_failed; 238 239 if (iser_alloc_login_buf(iser_conn)) 240 goto alloc_login_buf_fail; 241 242 iser_conn->num_rx_descs = session->cmds_max; 243 iser_conn->rx_descs = kmalloc_array(iser_conn->num_rx_descs, 244 sizeof(struct iser_rx_desc), 245 GFP_KERNEL); 246 if (!iser_conn->rx_descs) 247 goto rx_desc_alloc_fail; 248 249 rx_desc = iser_conn->rx_descs; 250 251 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) { 252 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc, 253 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 254 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 255 goto rx_desc_dma_map_failed; 256 257 rx_desc->dma_addr = dma_addr; 258 rx_desc->cqe.done = iser_task_rsp; 259 rx_sg = &rx_desc->rx_sg; 260 rx_sg->addr = rx_desc->dma_addr; 261 rx_sg->length = ISER_RX_PAYLOAD_SIZE; 262 rx_sg->lkey = device->pd->local_dma_lkey; 263 } 264 265 return 0; 266 267 rx_desc_dma_map_failed: 268 rx_desc = iser_conn->rx_descs; 269 for (j = 0; j < i; j++, rx_desc++) 270 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 271 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 272 kfree(iser_conn->rx_descs); 273 iser_conn->rx_descs = NULL; 274 rx_desc_alloc_fail: 275 iser_free_login_buf(iser_conn); 276 alloc_login_buf_fail: 277 iser_free_fastreg_pool(ib_conn); 278 create_rdma_reg_res_failed: 279 iser_err("failed allocating rx descriptors / data buffers\n"); 280 return -ENOMEM; 281 } 282 283 void iser_free_rx_descriptors(struct iser_conn *iser_conn) 284 { 285 int i; 286 struct iser_rx_desc *rx_desc; 287 struct ib_conn *ib_conn = &iser_conn->ib_conn; 288 struct iser_device *device = ib_conn->device; 289 290 iser_free_fastreg_pool(ib_conn); 291 292 rx_desc = iser_conn->rx_descs; 293 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) 294 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 295 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 296 kfree(iser_conn->rx_descs); 297 /* make sure we never redo any unmapping */ 298 iser_conn->rx_descs = NULL; 299 300 iser_free_login_buf(iser_conn); 301 } 302 303 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req) 304 { 305 struct iser_conn *iser_conn = conn->dd_data; 306 struct iscsi_session *session = conn->session; 307 int err = 0; 308 int i; 309 310 iser_dbg("req op %x flags %x\n", req->opcode, req->flags); 311 /* check if this is the last login - going to full feature phase */ 312 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE) 313 goto out; 314 315 if (session->discovery_sess) { 316 iser_info("Discovery session, re-using login RX buffer\n"); 317 goto out; 318 } 319 320 iser_info("Normal session, posting batch of RX %d buffers\n", 321 iser_conn->qp_max_recv_dtos - 1); 322 323 /* 324 * Initial post receive buffers. 325 * There is one already posted recv buffer (for the last login 326 * response). Therefore, the first recv buffer is skipped here. 327 */ 328 for (i = 1; i < iser_conn->qp_max_recv_dtos; i++) { 329 err = iser_post_recvm(iser_conn, &iser_conn->rx_descs[i]); 330 if (err) 331 goto out; 332 } 333 out: 334 return err; 335 } 336 337 /** 338 * iser_send_command - send command PDU 339 * @conn: link to matching iscsi connection 340 * @task: SCSI command task 341 */ 342 int iser_send_command(struct iscsi_conn *conn, struct iscsi_task *task) 343 { 344 struct iser_conn *iser_conn = conn->dd_data; 345 struct iscsi_iser_task *iser_task = task->dd_data; 346 unsigned long edtl; 347 int err; 348 struct iser_data_buf *data_buf, *prot_buf; 349 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr; 350 struct scsi_cmnd *sc = task->sc; 351 struct iser_tx_desc *tx_desc = &iser_task->desc; 352 353 edtl = ntohl(hdr->data_length); 354 355 /* build the tx desc regd header and add it to the tx desc dto */ 356 iser_create_send_desc(iser_conn, tx_desc, ISCSI_TX_SCSI_COMMAND, 357 iser_cmd_comp); 358 359 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 360 data_buf = &iser_task->data[ISER_DIR_IN]; 361 prot_buf = &iser_task->prot[ISER_DIR_IN]; 362 } else { 363 data_buf = &iser_task->data[ISER_DIR_OUT]; 364 prot_buf = &iser_task->prot[ISER_DIR_OUT]; 365 } 366 367 if (scsi_sg_count(sc)) { /* using a scatter list */ 368 data_buf->sg = scsi_sglist(sc); 369 data_buf->size = scsi_sg_count(sc); 370 } 371 data_buf->data_len = scsi_bufflen(sc); 372 373 if (scsi_prot_sg_count(sc)) { 374 prot_buf->sg = scsi_prot_sglist(sc); 375 prot_buf->size = scsi_prot_sg_count(sc); 376 prot_buf->data_len = (data_buf->data_len >> 377 ilog2(sc->device->sector_size)) * 8; 378 } 379 380 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 381 err = iser_prepare_read_cmd(task); 382 if (err) 383 goto send_command_error; 384 } 385 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { 386 err = iser_prepare_write_cmd(task, 387 task->imm_count, 388 task->imm_count + 389 task->unsol_r2t.data_length, 390 edtl); 391 if (err) 392 goto send_command_error; 393 } 394 395 iser_task->status = ISER_TASK_STATUS_STARTED; 396 397 err = iser_post_send(&iser_conn->ib_conn, tx_desc); 398 if (!err) 399 return 0; 400 401 send_command_error: 402 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); 403 return err; 404 } 405 406 /** 407 * iser_send_data_out - send data out PDU 408 * @conn: link to matching iscsi connection 409 * @task: SCSI command task 410 * @hdr: pointer to the LLD's iSCSI message header 411 */ 412 int iser_send_data_out(struct iscsi_conn *conn, struct iscsi_task *task, 413 struct iscsi_data *hdr) 414 { 415 struct iser_conn *iser_conn = conn->dd_data; 416 struct iscsi_iser_task *iser_task = task->dd_data; 417 struct iser_tx_desc *tx_desc; 418 struct iser_mem_reg *mem_reg; 419 unsigned long buf_offset; 420 unsigned long data_seg_len; 421 uint32_t itt; 422 int err; 423 struct ib_sge *tx_dsg; 424 425 itt = (__force uint32_t)hdr->itt; 426 data_seg_len = ntoh24(hdr->dlength); 427 buf_offset = ntohl(hdr->offset); 428 429 iser_dbg("%s itt %d dseg_len %d offset %d\n", 430 __func__,(int)itt,(int)data_seg_len,(int)buf_offset); 431 432 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); 433 if (!tx_desc) 434 return -ENOMEM; 435 436 tx_desc->type = ISCSI_TX_DATAOUT; 437 tx_desc->cqe.done = iser_dataout_comp; 438 tx_desc->iser_header.flags = ISER_VER; 439 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); 440 441 /* build the tx desc */ 442 err = iser_initialize_task_headers(task, tx_desc); 443 if (err) 444 goto send_data_out_error; 445 446 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT]; 447 tx_dsg = &tx_desc->tx_sg[1]; 448 tx_dsg->addr = mem_reg->sge.addr + buf_offset; 449 tx_dsg->length = data_seg_len; 450 tx_dsg->lkey = mem_reg->sge.lkey; 451 tx_desc->num_sge = 2; 452 453 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { 454 iser_err("Offset:%ld & DSL:%ld in Data-Out inconsistent with total len:%ld, itt:%d\n", 455 buf_offset, data_seg_len, 456 iser_task->data[ISER_DIR_OUT].data_len, itt); 457 err = -EINVAL; 458 goto send_data_out_error; 459 } 460 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", 461 itt, buf_offset, data_seg_len); 462 463 err = iser_post_send(&iser_conn->ib_conn, tx_desc); 464 if (!err) 465 return 0; 466 467 send_data_out_error: 468 kmem_cache_free(ig.desc_cache, tx_desc); 469 iser_err("conn %p failed err %d\n", conn, err); 470 return err; 471 } 472 473 int iser_send_control(struct iscsi_conn *conn, struct iscsi_task *task) 474 { 475 struct iser_conn *iser_conn = conn->dd_data; 476 struct iscsi_iser_task *iser_task = task->dd_data; 477 struct iser_tx_desc *mdesc = &iser_task->desc; 478 unsigned long data_seg_len; 479 int err = 0; 480 struct iser_device *device; 481 482 /* build the tx desc regd header and add it to the tx desc dto */ 483 iser_create_send_desc(iser_conn, mdesc, ISCSI_TX_CONTROL, 484 iser_ctrl_comp); 485 486 device = iser_conn->ib_conn.device; 487 488 data_seg_len = ntoh24(task->hdr->dlength); 489 490 if (data_seg_len > 0) { 491 struct iser_login_desc *desc = &iser_conn->login_desc; 492 struct ib_sge *tx_dsg = &mdesc->tx_sg[1]; 493 494 if (task != conn->login_task) { 495 iser_err("data present on non login task!!!\n"); 496 goto send_control_error; 497 } 498 499 ib_dma_sync_single_for_cpu(device->ib_device, desc->req_dma, 500 task->data_count, DMA_TO_DEVICE); 501 502 memcpy(desc->req, task->data, task->data_count); 503 504 ib_dma_sync_single_for_device(device->ib_device, desc->req_dma, 505 task->data_count, DMA_TO_DEVICE); 506 507 tx_dsg->addr = desc->req_dma; 508 tx_dsg->length = task->data_count; 509 tx_dsg->lkey = device->pd->local_dma_lkey; 510 mdesc->num_sge = 2; 511 } 512 513 if (task == conn->login_task) { 514 iser_dbg("op %x dsl %lx, posting login rx buffer\n", 515 task->hdr->opcode, data_seg_len); 516 err = iser_post_recvl(iser_conn); 517 if (err) 518 goto send_control_error; 519 err = iser_post_rx_bufs(conn, task->hdr); 520 if (err) 521 goto send_control_error; 522 } 523 524 err = iser_post_send(&iser_conn->ib_conn, mdesc); 525 if (!err) 526 return 0; 527 528 send_control_error: 529 iser_err("conn %p failed err %d\n",conn, err); 530 return err; 531 } 532 533 void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc) 534 { 535 struct ib_conn *ib_conn = wc->qp->qp_context; 536 struct iser_conn *iser_conn = to_iser_conn(ib_conn); 537 struct iser_login_desc *desc = iser_login(wc->wr_cqe); 538 struct iscsi_hdr *hdr; 539 char *data; 540 int length; 541 bool full_feature_phase; 542 543 if (unlikely(wc->status != IB_WC_SUCCESS)) { 544 iser_err_comp(wc, "login_rsp"); 545 return; 546 } 547 548 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, 549 desc->rsp_dma, ISER_RX_LOGIN_SIZE, 550 DMA_FROM_DEVICE); 551 552 hdr = desc->rsp + sizeof(struct iser_ctrl); 553 data = desc->rsp + ISER_HEADERS_LEN; 554 length = wc->byte_len - ISER_HEADERS_LEN; 555 full_feature_phase = ((hdr->flags & ISCSI_FULL_FEATURE_PHASE) == 556 ISCSI_FULL_FEATURE_PHASE) && 557 (hdr->flags & ISCSI_FLAG_CMD_FINAL); 558 559 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 560 hdr->itt, length); 561 562 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, data, length); 563 564 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 565 desc->rsp_dma, ISER_RX_LOGIN_SIZE, 566 DMA_FROM_DEVICE); 567 568 if (!full_feature_phase || 569 iser_conn->iscsi_conn->session->discovery_sess) 570 return; 571 572 /* Post the first RX buffer that is skipped in iser_post_rx_bufs() */ 573 iser_post_recvm(iser_conn, iser_conn->rx_descs); 574 } 575 576 static inline int iser_inv_desc(struct iser_fr_desc *desc, u32 rkey) 577 { 578 if (unlikely((!desc->sig_protected && rkey != desc->rsc.mr->rkey) || 579 (desc->sig_protected && rkey != desc->rsc.sig_mr->rkey))) { 580 iser_err("Bogus remote invalidation for rkey %#x\n", rkey); 581 return -EINVAL; 582 } 583 584 desc->rsc.mr_valid = 0; 585 586 return 0; 587 } 588 589 static int iser_check_remote_inv(struct iser_conn *iser_conn, struct ib_wc *wc, 590 struct iscsi_hdr *hdr) 591 { 592 if (wc->wc_flags & IB_WC_WITH_INVALIDATE) { 593 struct iscsi_task *task; 594 u32 rkey = wc->ex.invalidate_rkey; 595 596 iser_dbg("conn %p: remote invalidation for rkey %#x\n", 597 iser_conn, rkey); 598 599 if (unlikely(!iser_conn->snd_w_inv)) { 600 iser_err("conn %p: unexpected remote invalidation, terminating connection\n", 601 iser_conn); 602 return -EPROTO; 603 } 604 605 task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt); 606 if (likely(task)) { 607 struct iscsi_iser_task *iser_task = task->dd_data; 608 struct iser_fr_desc *desc; 609 610 if (iser_task->dir[ISER_DIR_IN]) { 611 desc = iser_task->rdma_reg[ISER_DIR_IN].desc; 612 if (unlikely(iser_inv_desc(desc, rkey))) 613 return -EINVAL; 614 } 615 616 if (iser_task->dir[ISER_DIR_OUT]) { 617 desc = iser_task->rdma_reg[ISER_DIR_OUT].desc; 618 if (unlikely(iser_inv_desc(desc, rkey))) 619 return -EINVAL; 620 } 621 } else { 622 iser_err("failed to get task for itt=%d\n", hdr->itt); 623 return -EINVAL; 624 } 625 } 626 627 return 0; 628 } 629 630 631 void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc) 632 { 633 struct ib_conn *ib_conn = wc->qp->qp_context; 634 struct iser_conn *iser_conn = to_iser_conn(ib_conn); 635 struct iser_rx_desc *desc = iser_rx(wc->wr_cqe); 636 struct iscsi_hdr *hdr; 637 int length, err; 638 639 if (unlikely(wc->status != IB_WC_SUCCESS)) { 640 iser_err_comp(wc, "task_rsp"); 641 return; 642 } 643 644 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, 645 desc->dma_addr, ISER_RX_PAYLOAD_SIZE, 646 DMA_FROM_DEVICE); 647 648 hdr = &desc->iscsi_header; 649 length = wc->byte_len - ISER_HEADERS_LEN; 650 651 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 652 hdr->itt, length); 653 654 if (iser_check_remote_inv(iser_conn, wc, hdr)) { 655 iscsi_conn_failure(iser_conn->iscsi_conn, 656 ISCSI_ERR_CONN_FAILED); 657 return; 658 } 659 660 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length); 661 662 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 663 desc->dma_addr, ISER_RX_PAYLOAD_SIZE, 664 DMA_FROM_DEVICE); 665 666 err = iser_post_recvm(iser_conn, desc); 667 if (err) 668 iser_err("posting rx buffer err %d\n", err); 669 } 670 671 void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc) 672 { 673 if (unlikely(wc->status != IB_WC_SUCCESS)) 674 iser_err_comp(wc, "command"); 675 } 676 677 void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc) 678 { 679 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe); 680 struct iscsi_task *task; 681 682 if (unlikely(wc->status != IB_WC_SUCCESS)) { 683 iser_err_comp(wc, "control"); 684 return; 685 } 686 687 /* this arithmetic is legal by libiscsi dd_data allocation */ 688 task = (void *)desc - sizeof(struct iscsi_task); 689 if (task->hdr->itt == RESERVED_ITT) 690 iscsi_put_task(task); 691 } 692 693 void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc) 694 { 695 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe); 696 struct ib_conn *ib_conn = wc->qp->qp_context; 697 struct iser_device *device = ib_conn->device; 698 699 if (unlikely(wc->status != IB_WC_SUCCESS)) 700 iser_err_comp(wc, "dataout"); 701 702 ib_dma_unmap_single(device->ib_device, desc->dma_addr, 703 ISER_HEADERS_LEN, DMA_TO_DEVICE); 704 kmem_cache_free(ig.desc_cache, desc); 705 } 706 707 void iser_task_rdma_init(struct iscsi_iser_task *iser_task) 708 709 { 710 iser_task->status = ISER_TASK_STATUS_INIT; 711 712 iser_task->dir[ISER_DIR_IN] = 0; 713 iser_task->dir[ISER_DIR_OUT] = 0; 714 715 iser_task->data[ISER_DIR_IN].data_len = 0; 716 iser_task->data[ISER_DIR_OUT].data_len = 0; 717 718 iser_task->prot[ISER_DIR_IN].data_len = 0; 719 iser_task->prot[ISER_DIR_OUT].data_len = 0; 720 721 iser_task->prot[ISER_DIR_IN].dma_nents = 0; 722 iser_task->prot[ISER_DIR_OUT].dma_nents = 0; 723 724 memset(&iser_task->rdma_reg[ISER_DIR_IN], 0, 725 sizeof(struct iser_mem_reg)); 726 memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0, 727 sizeof(struct iser_mem_reg)); 728 } 729 730 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) 731 { 732 733 if (iser_task->dir[ISER_DIR_IN]) { 734 iser_unreg_mem_fastreg(iser_task, ISER_DIR_IN); 735 iser_dma_unmap_task_data(iser_task, ISER_DIR_IN, 736 DMA_FROM_DEVICE); 737 } 738 739 if (iser_task->dir[ISER_DIR_OUT]) { 740 iser_unreg_mem_fastreg(iser_task, ISER_DIR_OUT); 741 iser_dma_unmap_task_data(iser_task, ISER_DIR_OUT, 742 DMA_TO_DEVICE); 743 } 744 } 745