1 /* 2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. 3 * Copyright (c) 2013 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. Total data size is stored in 45 * iser_task->data[ISER_DIR_IN].data_len 46 */ 47 static int iser_prepare_read_cmd(struct iscsi_task *task, 48 unsigned int edtl) 49 50 { 51 struct iscsi_iser_task *iser_task = task->dd_data; 52 struct iser_device *device = iser_task->iser_conn->ib_conn->device; 53 struct iser_regd_buf *regd_buf; 54 int err; 55 struct iser_hdr *hdr = &iser_task->desc.iser_header; 56 struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN]; 57 58 err = iser_dma_map_task_data(iser_task, 59 buf_in, 60 ISER_DIR_IN, 61 DMA_FROM_DEVICE); 62 if (err) 63 return err; 64 65 if (edtl > iser_task->data[ISER_DIR_IN].data_len) { 66 iser_err("Total data length: %ld, less than EDTL: " 67 "%d, in READ cmd BHS itt: %d, conn: 0x%p\n", 68 iser_task->data[ISER_DIR_IN].data_len, edtl, 69 task->itt, iser_task->iser_conn); 70 return -EINVAL; 71 } 72 73 err = device->iser_reg_rdma_mem(iser_task, ISER_DIR_IN); 74 if (err) { 75 iser_err("Failed to set up Data-IN RDMA\n"); 76 return err; 77 } 78 regd_buf = &iser_task->rdma_regd[ISER_DIR_IN]; 79 80 hdr->flags |= ISER_RSV; 81 hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey); 82 hdr->read_va = cpu_to_be64(regd_buf->reg.va); 83 84 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n", 85 task->itt, regd_buf->reg.rkey, 86 (unsigned long long)regd_buf->reg.va); 87 88 return 0; 89 } 90 91 /* Register user buffer memory and initialize passive rdma 92 * dto descriptor. Total data size is stored in 93 * task->data[ISER_DIR_OUT].data_len 94 */ 95 static int 96 iser_prepare_write_cmd(struct iscsi_task *task, 97 unsigned int imm_sz, 98 unsigned int unsol_sz, 99 unsigned int edtl) 100 { 101 struct iscsi_iser_task *iser_task = task->dd_data; 102 struct iser_device *device = iser_task->iser_conn->ib_conn->device; 103 struct iser_regd_buf *regd_buf; 104 int err; 105 struct iser_hdr *hdr = &iser_task->desc.iser_header; 106 struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT]; 107 struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1]; 108 109 err = iser_dma_map_task_data(iser_task, 110 buf_out, 111 ISER_DIR_OUT, 112 DMA_TO_DEVICE); 113 if (err) 114 return err; 115 116 if (edtl > iser_task->data[ISER_DIR_OUT].data_len) { 117 iser_err("Total data length: %ld, less than EDTL: %d, " 118 "in WRITE cmd BHS itt: %d, conn: 0x%p\n", 119 iser_task->data[ISER_DIR_OUT].data_len, 120 edtl, task->itt, task->conn); 121 return -EINVAL; 122 } 123 124 err = device->iser_reg_rdma_mem(iser_task, ISER_DIR_OUT); 125 if (err != 0) { 126 iser_err("Failed to register write cmd RDMA mem\n"); 127 return err; 128 } 129 130 regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; 131 132 if (unsol_sz < edtl) { 133 hdr->flags |= ISER_WSV; 134 hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey); 135 hdr->write_va = cpu_to_be64(regd_buf->reg.va + unsol_sz); 136 137 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X " 138 "VA:%#llX + unsol:%d\n", 139 task->itt, regd_buf->reg.rkey, 140 (unsigned long long)regd_buf->reg.va, unsol_sz); 141 } 142 143 if (imm_sz > 0) { 144 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n", 145 task->itt, imm_sz); 146 tx_dsg->addr = regd_buf->reg.va; 147 tx_dsg->length = imm_sz; 148 tx_dsg->lkey = regd_buf->reg.lkey; 149 iser_task->desc.num_sge = 2; 150 } 151 152 return 0; 153 } 154 155 /* creates a new tx descriptor and adds header regd buffer */ 156 static void iser_create_send_desc(struct iser_conn *ib_conn, 157 struct iser_tx_desc *tx_desc) 158 { 159 struct iser_device *device = ib_conn->device; 160 161 ib_dma_sync_single_for_cpu(device->ib_device, 162 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 163 164 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); 165 tx_desc->iser_header.flags = ISER_VER; 166 167 tx_desc->num_sge = 1; 168 169 if (tx_desc->tx_sg[0].lkey != device->mr->lkey) { 170 tx_desc->tx_sg[0].lkey = device->mr->lkey; 171 iser_dbg("sdesc %p lkey mismatch, fixing\n", tx_desc); 172 } 173 } 174 175 static void iser_free_login_buf(struct iser_conn *ib_conn) 176 { 177 if (!ib_conn->login_buf) 178 return; 179 180 if (ib_conn->login_req_dma) 181 ib_dma_unmap_single(ib_conn->device->ib_device, 182 ib_conn->login_req_dma, 183 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 184 185 if (ib_conn->login_resp_dma) 186 ib_dma_unmap_single(ib_conn->device->ib_device, 187 ib_conn->login_resp_dma, 188 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 189 190 kfree(ib_conn->login_buf); 191 192 /* make sure we never redo any unmapping */ 193 ib_conn->login_req_dma = 0; 194 ib_conn->login_resp_dma = 0; 195 ib_conn->login_buf = NULL; 196 } 197 198 static int iser_alloc_login_buf(struct iser_conn *ib_conn) 199 { 200 struct iser_device *device; 201 int req_err, resp_err; 202 203 BUG_ON(ib_conn->device == NULL); 204 205 device = ib_conn->device; 206 207 ib_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN + 208 ISER_RX_LOGIN_SIZE, GFP_KERNEL); 209 if (!ib_conn->login_buf) 210 goto out_err; 211 212 ib_conn->login_req_buf = ib_conn->login_buf; 213 ib_conn->login_resp_buf = ib_conn->login_buf + 214 ISCSI_DEF_MAX_RECV_SEG_LEN; 215 216 ib_conn->login_req_dma = ib_dma_map_single(ib_conn->device->ib_device, 217 (void *)ib_conn->login_req_buf, 218 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 219 220 ib_conn->login_resp_dma = ib_dma_map_single(ib_conn->device->ib_device, 221 (void *)ib_conn->login_resp_buf, 222 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 223 224 req_err = ib_dma_mapping_error(device->ib_device, 225 ib_conn->login_req_dma); 226 resp_err = ib_dma_mapping_error(device->ib_device, 227 ib_conn->login_resp_dma); 228 229 if (req_err || resp_err) { 230 if (req_err) 231 ib_conn->login_req_dma = 0; 232 if (resp_err) 233 ib_conn->login_resp_dma = 0; 234 goto free_login_buf; 235 } 236 return 0; 237 238 free_login_buf: 239 iser_free_login_buf(ib_conn); 240 241 out_err: 242 iser_err("unable to alloc or map login buf\n"); 243 return -ENOMEM; 244 } 245 246 int iser_alloc_rx_descriptors(struct iser_conn *ib_conn, struct iscsi_session *session) 247 { 248 int i, j; 249 u64 dma_addr; 250 struct iser_rx_desc *rx_desc; 251 struct ib_sge *rx_sg; 252 struct iser_device *device = ib_conn->device; 253 254 ib_conn->qp_max_recv_dtos = session->cmds_max; 255 ib_conn->qp_max_recv_dtos_mask = session->cmds_max - 1; /* cmds_max is 2^N */ 256 ib_conn->min_posted_rx = ib_conn->qp_max_recv_dtos >> 2; 257 258 if (device->iser_alloc_rdma_reg_res(ib_conn, session->scsi_cmds_max)) 259 goto create_rdma_reg_res_failed; 260 261 if (iser_alloc_login_buf(ib_conn)) 262 goto alloc_login_buf_fail; 263 264 ib_conn->rx_descs = kmalloc(session->cmds_max * 265 sizeof(struct iser_rx_desc), GFP_KERNEL); 266 if (!ib_conn->rx_descs) 267 goto rx_desc_alloc_fail; 268 269 rx_desc = ib_conn->rx_descs; 270 271 for (i = 0; i < ib_conn->qp_max_recv_dtos; i++, rx_desc++) { 272 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc, 273 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 274 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 275 goto rx_desc_dma_map_failed; 276 277 rx_desc->dma_addr = dma_addr; 278 279 rx_sg = &rx_desc->rx_sg; 280 rx_sg->addr = rx_desc->dma_addr; 281 rx_sg->length = ISER_RX_PAYLOAD_SIZE; 282 rx_sg->lkey = device->mr->lkey; 283 } 284 285 ib_conn->rx_desc_head = 0; 286 return 0; 287 288 rx_desc_dma_map_failed: 289 rx_desc = ib_conn->rx_descs; 290 for (j = 0; j < i; j++, rx_desc++) 291 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 292 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 293 kfree(ib_conn->rx_descs); 294 ib_conn->rx_descs = NULL; 295 rx_desc_alloc_fail: 296 iser_free_login_buf(ib_conn); 297 alloc_login_buf_fail: 298 device->iser_free_rdma_reg_res(ib_conn); 299 create_rdma_reg_res_failed: 300 iser_err("failed allocating rx descriptors / data buffers\n"); 301 return -ENOMEM; 302 } 303 304 void iser_free_rx_descriptors(struct iser_conn *ib_conn) 305 { 306 int i; 307 struct iser_rx_desc *rx_desc; 308 struct iser_device *device = ib_conn->device; 309 310 if (!ib_conn->rx_descs) 311 goto free_login_buf; 312 313 if (device->iser_free_rdma_reg_res) 314 device->iser_free_rdma_reg_res(ib_conn); 315 316 rx_desc = ib_conn->rx_descs; 317 for (i = 0; i < ib_conn->qp_max_recv_dtos; i++, rx_desc++) 318 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 319 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 320 kfree(ib_conn->rx_descs); 321 /* make sure we never redo any unmapping */ 322 ib_conn->rx_descs = NULL; 323 324 free_login_buf: 325 iser_free_login_buf(ib_conn); 326 } 327 328 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req) 329 { 330 struct iscsi_iser_conn *iser_conn = conn->dd_data; 331 struct iscsi_session *session = conn->session; 332 333 iser_dbg("req op %x flags %x\n", req->opcode, req->flags); 334 /* check if this is the last login - going to full feature phase */ 335 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE) 336 return 0; 337 338 /* 339 * Check that there is one posted recv buffer (for the last login 340 * response) and no posted send buffers left - they must have been 341 * consumed during previous login phases. 342 */ 343 WARN_ON(iser_conn->ib_conn->post_recv_buf_count != 1); 344 WARN_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0); 345 346 if (session->discovery_sess) { 347 iser_info("Discovery session, re-using login RX buffer\n"); 348 return 0; 349 } else 350 iser_info("Normal session, posting batch of RX %d buffers\n", 351 iser_conn->ib_conn->min_posted_rx); 352 353 /* Initial post receive buffers */ 354 if (iser_post_recvm(iser_conn->ib_conn, 355 iser_conn->ib_conn->min_posted_rx)) 356 return -ENOMEM; 357 358 return 0; 359 } 360 361 /** 362 * iser_send_command - send command PDU 363 */ 364 int iser_send_command(struct iscsi_conn *conn, 365 struct iscsi_task *task) 366 { 367 struct iscsi_iser_conn *iser_conn = conn->dd_data; 368 struct iscsi_iser_task *iser_task = task->dd_data; 369 unsigned long edtl; 370 int err; 371 struct iser_data_buf *data_buf; 372 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr; 373 struct scsi_cmnd *sc = task->sc; 374 struct iser_tx_desc *tx_desc = &iser_task->desc; 375 376 edtl = ntohl(hdr->data_length); 377 378 /* build the tx desc regd header and add it to the tx desc dto */ 379 tx_desc->type = ISCSI_TX_SCSI_COMMAND; 380 iser_create_send_desc(iser_conn->ib_conn, tx_desc); 381 382 if (hdr->flags & ISCSI_FLAG_CMD_READ) 383 data_buf = &iser_task->data[ISER_DIR_IN]; 384 else 385 data_buf = &iser_task->data[ISER_DIR_OUT]; 386 387 if (scsi_sg_count(sc)) { /* using a scatter list */ 388 data_buf->buf = scsi_sglist(sc); 389 data_buf->size = scsi_sg_count(sc); 390 } 391 392 data_buf->data_len = scsi_bufflen(sc); 393 394 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 395 err = iser_prepare_read_cmd(task, edtl); 396 if (err) 397 goto send_command_error; 398 } 399 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { 400 err = iser_prepare_write_cmd(task, 401 task->imm_count, 402 task->imm_count + 403 task->unsol_r2t.data_length, 404 edtl); 405 if (err) 406 goto send_command_error; 407 } 408 409 iser_task->status = ISER_TASK_STATUS_STARTED; 410 411 err = iser_post_send(iser_conn->ib_conn, tx_desc); 412 if (!err) 413 return 0; 414 415 send_command_error: 416 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); 417 return err; 418 } 419 420 /** 421 * iser_send_data_out - send data out PDU 422 */ 423 int iser_send_data_out(struct iscsi_conn *conn, 424 struct iscsi_task *task, 425 struct iscsi_data *hdr) 426 { 427 struct iscsi_iser_conn *iser_conn = conn->dd_data; 428 struct iscsi_iser_task *iser_task = task->dd_data; 429 struct iser_tx_desc *tx_desc = NULL; 430 struct iser_regd_buf *regd_buf; 431 unsigned long buf_offset; 432 unsigned long data_seg_len; 433 uint32_t itt; 434 int err = 0; 435 struct ib_sge *tx_dsg; 436 437 itt = (__force uint32_t)hdr->itt; 438 data_seg_len = ntoh24(hdr->dlength); 439 buf_offset = ntohl(hdr->offset); 440 441 iser_dbg("%s itt %d dseg_len %d offset %d\n", 442 __func__,(int)itt,(int)data_seg_len,(int)buf_offset); 443 444 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); 445 if (tx_desc == NULL) { 446 iser_err("Failed to alloc desc for post dataout\n"); 447 return -ENOMEM; 448 } 449 450 tx_desc->type = ISCSI_TX_DATAOUT; 451 tx_desc->iser_header.flags = ISER_VER; 452 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); 453 454 /* build the tx desc */ 455 iser_initialize_task_headers(task, tx_desc); 456 457 regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; 458 tx_dsg = &tx_desc->tx_sg[1]; 459 tx_dsg->addr = regd_buf->reg.va + buf_offset; 460 tx_dsg->length = data_seg_len; 461 tx_dsg->lkey = regd_buf->reg.lkey; 462 tx_desc->num_sge = 2; 463 464 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { 465 iser_err("Offset:%ld & DSL:%ld in Data-Out " 466 "inconsistent with total len:%ld, itt:%d\n", 467 buf_offset, data_seg_len, 468 iser_task->data[ISER_DIR_OUT].data_len, itt); 469 err = -EINVAL; 470 goto send_data_out_error; 471 } 472 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", 473 itt, buf_offset, data_seg_len); 474 475 476 err = iser_post_send(iser_conn->ib_conn, tx_desc); 477 if (!err) 478 return 0; 479 480 send_data_out_error: 481 kmem_cache_free(ig.desc_cache, tx_desc); 482 iser_err("conn %p failed err %d\n",conn, err); 483 return err; 484 } 485 486 int iser_send_control(struct iscsi_conn *conn, 487 struct iscsi_task *task) 488 { 489 struct iscsi_iser_conn *iser_conn = conn->dd_data; 490 struct iscsi_iser_task *iser_task = task->dd_data; 491 struct iser_tx_desc *mdesc = &iser_task->desc; 492 unsigned long data_seg_len; 493 int err = 0; 494 struct iser_device *device; 495 struct iser_conn *ib_conn = iser_conn->ib_conn; 496 497 /* build the tx desc regd header and add it to the tx desc dto */ 498 mdesc->type = ISCSI_TX_CONTROL; 499 iser_create_send_desc(iser_conn->ib_conn, mdesc); 500 501 device = iser_conn->ib_conn->device; 502 503 data_seg_len = ntoh24(task->hdr->dlength); 504 505 if (data_seg_len > 0) { 506 struct ib_sge *tx_dsg = &mdesc->tx_sg[1]; 507 if (task != conn->login_task) { 508 iser_err("data present on non login task!!!\n"); 509 goto send_control_error; 510 } 511 512 ib_dma_sync_single_for_cpu(device->ib_device, 513 ib_conn->login_req_dma, task->data_count, 514 DMA_TO_DEVICE); 515 516 memcpy(iser_conn->ib_conn->login_req_buf, task->data, 517 task->data_count); 518 519 ib_dma_sync_single_for_device(device->ib_device, 520 ib_conn->login_req_dma, task->data_count, 521 DMA_TO_DEVICE); 522 523 tx_dsg->addr = iser_conn->ib_conn->login_req_dma; 524 tx_dsg->length = task->data_count; 525 tx_dsg->lkey = device->mr->lkey; 526 mdesc->num_sge = 2; 527 } 528 529 if (task == conn->login_task) { 530 iser_dbg("op %x dsl %lx, posting login rx buffer\n", 531 task->hdr->opcode, data_seg_len); 532 err = iser_post_recvl(iser_conn->ib_conn); 533 if (err) 534 goto send_control_error; 535 err = iser_post_rx_bufs(conn, task->hdr); 536 if (err) 537 goto send_control_error; 538 } 539 540 err = iser_post_send(iser_conn->ib_conn, mdesc); 541 if (!err) 542 return 0; 543 544 send_control_error: 545 iser_err("conn %p failed err %d\n",conn, err); 546 return err; 547 } 548 549 /** 550 * iser_rcv_dto_completion - recv DTO completion 551 */ 552 void iser_rcv_completion(struct iser_rx_desc *rx_desc, 553 unsigned long rx_xfer_len, 554 struct iser_conn *ib_conn) 555 { 556 struct iscsi_iser_conn *conn = ib_conn->iser_conn; 557 struct iscsi_hdr *hdr; 558 u64 rx_dma; 559 int rx_buflen, outstanding, count, err; 560 561 /* differentiate between login to all other PDUs */ 562 if ((char *)rx_desc == ib_conn->login_resp_buf) { 563 rx_dma = ib_conn->login_resp_dma; 564 rx_buflen = ISER_RX_LOGIN_SIZE; 565 } else { 566 rx_dma = rx_desc->dma_addr; 567 rx_buflen = ISER_RX_PAYLOAD_SIZE; 568 } 569 570 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma, 571 rx_buflen, DMA_FROM_DEVICE); 572 573 hdr = &rx_desc->iscsi_header; 574 575 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 576 hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN)); 577 578 iscsi_iser_recv(conn->iscsi_conn, hdr, 579 rx_desc->data, rx_xfer_len - ISER_HEADERS_LEN); 580 581 ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma, 582 rx_buflen, DMA_FROM_DEVICE); 583 584 /* decrementing conn->post_recv_buf_count only --after-- freeing the * 585 * task eliminates the need to worry on tasks which are completed in * 586 * parallel to the execution of iser_conn_term. So the code that waits * 587 * for the posted rx bufs refcount to become zero handles everything */ 588 conn->ib_conn->post_recv_buf_count--; 589 590 if (rx_dma == ib_conn->login_resp_dma) 591 return; 592 593 outstanding = ib_conn->post_recv_buf_count; 594 if (outstanding + ib_conn->min_posted_rx <= ib_conn->qp_max_recv_dtos) { 595 count = min(ib_conn->qp_max_recv_dtos - outstanding, 596 ib_conn->min_posted_rx); 597 err = iser_post_recvm(ib_conn, count); 598 if (err) 599 iser_err("posting %d rx bufs err %d\n", count, err); 600 } 601 } 602 603 void iser_snd_completion(struct iser_tx_desc *tx_desc, 604 struct iser_conn *ib_conn) 605 { 606 struct iscsi_task *task; 607 struct iser_device *device = ib_conn->device; 608 609 if (tx_desc->type == ISCSI_TX_DATAOUT) { 610 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr, 611 ISER_HEADERS_LEN, DMA_TO_DEVICE); 612 kmem_cache_free(ig.desc_cache, tx_desc); 613 tx_desc = NULL; 614 } 615 616 atomic_dec(&ib_conn->post_send_buf_count); 617 618 if (tx_desc && tx_desc->type == ISCSI_TX_CONTROL) { 619 /* this arithmetic is legal by libiscsi dd_data allocation */ 620 task = (void *) ((long)(void *)tx_desc - 621 sizeof(struct iscsi_task)); 622 if (task->hdr->itt == RESERVED_ITT) 623 iscsi_put_task(task); 624 } 625 } 626 627 void iser_task_rdma_init(struct iscsi_iser_task *iser_task) 628 629 { 630 iser_task->status = ISER_TASK_STATUS_INIT; 631 632 iser_task->dir[ISER_DIR_IN] = 0; 633 iser_task->dir[ISER_DIR_OUT] = 0; 634 635 iser_task->data[ISER_DIR_IN].data_len = 0; 636 iser_task->data[ISER_DIR_OUT].data_len = 0; 637 638 memset(&iser_task->rdma_regd[ISER_DIR_IN], 0, 639 sizeof(struct iser_regd_buf)); 640 memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0, 641 sizeof(struct iser_regd_buf)); 642 } 643 644 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) 645 { 646 struct iser_device *device = iser_task->iser_conn->ib_conn->device; 647 int is_rdma_aligned = 1; 648 649 /* if we were reading, copy back to unaligned sglist, 650 * anyway dma_unmap and free the copy 651 */ 652 if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) { 653 is_rdma_aligned = 0; 654 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_IN); 655 } 656 if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) { 657 is_rdma_aligned = 0; 658 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_OUT); 659 } 660 661 if (iser_task->dir[ISER_DIR_IN]) 662 device->iser_unreg_rdma_mem(iser_task, ISER_DIR_IN); 663 664 if (iser_task->dir[ISER_DIR_OUT]) 665 device->iser_unreg_rdma_mem(iser_task, ISER_DIR_OUT); 666 667 /* if the data was unaligned, it was already unmapped and then copied */ 668 if (is_rdma_aligned) 669 iser_dma_unmap_task_data(iser_task); 670 } 671