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_device *device = iser_task->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 (scsi_prot_sg_count(iser_task->sc)) { 66 struct iser_data_buf *pbuf_in = &iser_task->prot[ISER_DIR_IN]; 67 68 err = iser_dma_map_task_data(iser_task, 69 pbuf_in, 70 ISER_DIR_IN, 71 DMA_FROM_DEVICE); 72 if (err) 73 return err; 74 } 75 76 err = device->iser_reg_rdma_mem(iser_task, ISER_DIR_IN); 77 if (err) { 78 iser_err("Failed to set up Data-IN RDMA\n"); 79 return err; 80 } 81 regd_buf = &iser_task->rdma_regd[ISER_DIR_IN]; 82 83 hdr->flags |= ISER_RSV; 84 hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey); 85 hdr->read_va = cpu_to_be64(regd_buf->reg.va); 86 87 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n", 88 task->itt, regd_buf->reg.rkey, 89 (unsigned long long)regd_buf->reg.va); 90 91 return 0; 92 } 93 94 /* Register user buffer memory and initialize passive rdma 95 * dto descriptor. Data size is stored in 96 * task->data[ISER_DIR_OUT].data_len, Protection size 97 * is stored at task->prot[ISER_DIR_OUT].data_len 98 */ 99 static int 100 iser_prepare_write_cmd(struct iscsi_task *task, 101 unsigned int imm_sz, 102 unsigned int unsol_sz, 103 unsigned int edtl) 104 { 105 struct iscsi_iser_task *iser_task = task->dd_data; 106 struct iser_device *device = iser_task->ib_conn->device; 107 struct iser_regd_buf *regd_buf; 108 int err; 109 struct iser_hdr *hdr = &iser_task->desc.iser_header; 110 struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT]; 111 struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1]; 112 113 err = iser_dma_map_task_data(iser_task, 114 buf_out, 115 ISER_DIR_OUT, 116 DMA_TO_DEVICE); 117 if (err) 118 return err; 119 120 if (scsi_prot_sg_count(iser_task->sc)) { 121 struct iser_data_buf *pbuf_out = &iser_task->prot[ISER_DIR_OUT]; 122 123 err = iser_dma_map_task_data(iser_task, 124 pbuf_out, 125 ISER_DIR_OUT, 126 DMA_TO_DEVICE); 127 if (err) 128 return err; 129 } 130 131 err = device->iser_reg_rdma_mem(iser_task, ISER_DIR_OUT); 132 if (err != 0) { 133 iser_err("Failed to register write cmd RDMA mem\n"); 134 return err; 135 } 136 137 regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; 138 139 if (unsol_sz < edtl) { 140 hdr->flags |= ISER_WSV; 141 hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey); 142 hdr->write_va = cpu_to_be64(regd_buf->reg.va + unsol_sz); 143 144 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X " 145 "VA:%#llX + unsol:%d\n", 146 task->itt, regd_buf->reg.rkey, 147 (unsigned long long)regd_buf->reg.va, unsol_sz); 148 } 149 150 if (imm_sz > 0) { 151 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n", 152 task->itt, imm_sz); 153 tx_dsg->addr = regd_buf->reg.va; 154 tx_dsg->length = imm_sz; 155 tx_dsg->lkey = regd_buf->reg.lkey; 156 iser_task->desc.num_sge = 2; 157 } 158 159 return 0; 160 } 161 162 /* creates a new tx descriptor and adds header regd buffer */ 163 static void iser_create_send_desc(struct iser_conn *ib_conn, 164 struct iser_tx_desc *tx_desc) 165 { 166 struct iser_device *device = ib_conn->device; 167 168 ib_dma_sync_single_for_cpu(device->ib_device, 169 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 170 171 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); 172 tx_desc->iser_header.flags = ISER_VER; 173 174 tx_desc->num_sge = 1; 175 176 if (tx_desc->tx_sg[0].lkey != device->mr->lkey) { 177 tx_desc->tx_sg[0].lkey = device->mr->lkey; 178 iser_dbg("sdesc %p lkey mismatch, fixing\n", tx_desc); 179 } 180 } 181 182 static void iser_free_login_buf(struct iser_conn *ib_conn) 183 { 184 if (!ib_conn->login_buf) 185 return; 186 187 if (ib_conn->login_req_dma) 188 ib_dma_unmap_single(ib_conn->device->ib_device, 189 ib_conn->login_req_dma, 190 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 191 192 if (ib_conn->login_resp_dma) 193 ib_dma_unmap_single(ib_conn->device->ib_device, 194 ib_conn->login_resp_dma, 195 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 196 197 kfree(ib_conn->login_buf); 198 199 /* make sure we never redo any unmapping */ 200 ib_conn->login_req_dma = 0; 201 ib_conn->login_resp_dma = 0; 202 ib_conn->login_buf = NULL; 203 } 204 205 static int iser_alloc_login_buf(struct iser_conn *ib_conn) 206 { 207 struct iser_device *device; 208 int req_err, resp_err; 209 210 BUG_ON(ib_conn->device == NULL); 211 212 device = ib_conn->device; 213 214 ib_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN + 215 ISER_RX_LOGIN_SIZE, GFP_KERNEL); 216 if (!ib_conn->login_buf) 217 goto out_err; 218 219 ib_conn->login_req_buf = ib_conn->login_buf; 220 ib_conn->login_resp_buf = ib_conn->login_buf + 221 ISCSI_DEF_MAX_RECV_SEG_LEN; 222 223 ib_conn->login_req_dma = ib_dma_map_single(ib_conn->device->ib_device, 224 (void *)ib_conn->login_req_buf, 225 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 226 227 ib_conn->login_resp_dma = ib_dma_map_single(ib_conn->device->ib_device, 228 (void *)ib_conn->login_resp_buf, 229 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 230 231 req_err = ib_dma_mapping_error(device->ib_device, 232 ib_conn->login_req_dma); 233 resp_err = ib_dma_mapping_error(device->ib_device, 234 ib_conn->login_resp_dma); 235 236 if (req_err || resp_err) { 237 if (req_err) 238 ib_conn->login_req_dma = 0; 239 if (resp_err) 240 ib_conn->login_resp_dma = 0; 241 goto free_login_buf; 242 } 243 return 0; 244 245 free_login_buf: 246 iser_free_login_buf(ib_conn); 247 248 out_err: 249 iser_err("unable to alloc or map login buf\n"); 250 return -ENOMEM; 251 } 252 253 int iser_alloc_rx_descriptors(struct iser_conn *ib_conn, struct iscsi_session *session) 254 { 255 int i, j; 256 u64 dma_addr; 257 struct iser_rx_desc *rx_desc; 258 struct ib_sge *rx_sg; 259 struct iser_device *device = ib_conn->device; 260 261 ib_conn->qp_max_recv_dtos = session->cmds_max; 262 ib_conn->qp_max_recv_dtos_mask = session->cmds_max - 1; /* cmds_max is 2^N */ 263 ib_conn->min_posted_rx = ib_conn->qp_max_recv_dtos >> 2; 264 265 if (device->iser_alloc_rdma_reg_res(ib_conn, session->scsi_cmds_max)) 266 goto create_rdma_reg_res_failed; 267 268 if (iser_alloc_login_buf(ib_conn)) 269 goto alloc_login_buf_fail; 270 271 ib_conn->rx_descs = kmalloc(session->cmds_max * 272 sizeof(struct iser_rx_desc), GFP_KERNEL); 273 if (!ib_conn->rx_descs) 274 goto rx_desc_alloc_fail; 275 276 rx_desc = ib_conn->rx_descs; 277 278 for (i = 0; i < ib_conn->qp_max_recv_dtos; i++, rx_desc++) { 279 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc, 280 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 281 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 282 goto rx_desc_dma_map_failed; 283 284 rx_desc->dma_addr = dma_addr; 285 286 rx_sg = &rx_desc->rx_sg; 287 rx_sg->addr = rx_desc->dma_addr; 288 rx_sg->length = ISER_RX_PAYLOAD_SIZE; 289 rx_sg->lkey = device->mr->lkey; 290 } 291 292 ib_conn->rx_desc_head = 0; 293 return 0; 294 295 rx_desc_dma_map_failed: 296 rx_desc = ib_conn->rx_descs; 297 for (j = 0; j < i; j++, rx_desc++) 298 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 299 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 300 kfree(ib_conn->rx_descs); 301 ib_conn->rx_descs = NULL; 302 rx_desc_alloc_fail: 303 iser_free_login_buf(ib_conn); 304 alloc_login_buf_fail: 305 device->iser_free_rdma_reg_res(ib_conn); 306 create_rdma_reg_res_failed: 307 iser_err("failed allocating rx descriptors / data buffers\n"); 308 return -ENOMEM; 309 } 310 311 void iser_free_rx_descriptors(struct iser_conn *ib_conn) 312 { 313 int i; 314 struct iser_rx_desc *rx_desc; 315 struct iser_device *device = ib_conn->device; 316 317 if (!ib_conn->rx_descs) 318 goto free_login_buf; 319 320 if (device->iser_free_rdma_reg_res) 321 device->iser_free_rdma_reg_res(ib_conn); 322 323 rx_desc = ib_conn->rx_descs; 324 for (i = 0; i < ib_conn->qp_max_recv_dtos; i++, rx_desc++) 325 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 326 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 327 kfree(ib_conn->rx_descs); 328 /* make sure we never redo any unmapping */ 329 ib_conn->rx_descs = NULL; 330 331 free_login_buf: 332 iser_free_login_buf(ib_conn); 333 } 334 335 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req) 336 { 337 struct iser_conn *ib_conn = conn->dd_data; 338 struct iscsi_session *session = conn->session; 339 340 iser_dbg("req op %x flags %x\n", req->opcode, req->flags); 341 /* check if this is the last login - going to full feature phase */ 342 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE) 343 return 0; 344 345 /* 346 * Check that there is one posted recv buffer (for the last login 347 * response) and no posted send buffers left - they must have been 348 * consumed during previous login phases. 349 */ 350 WARN_ON(ib_conn->post_recv_buf_count != 1); 351 WARN_ON(atomic_read(&ib_conn->post_send_buf_count) != 0); 352 353 if (session->discovery_sess) { 354 iser_info("Discovery session, re-using login RX buffer\n"); 355 return 0; 356 } else 357 iser_info("Normal session, posting batch of RX %d buffers\n", 358 ib_conn->min_posted_rx); 359 360 /* Initial post receive buffers */ 361 if (iser_post_recvm(ib_conn, ib_conn->min_posted_rx)) 362 return -ENOMEM; 363 364 return 0; 365 } 366 367 /** 368 * iser_send_command - send command PDU 369 */ 370 int iser_send_command(struct iscsi_conn *conn, 371 struct iscsi_task *task) 372 { 373 struct iser_conn *ib_conn = conn->dd_data; 374 struct iscsi_iser_task *iser_task = task->dd_data; 375 unsigned long edtl; 376 int err; 377 struct iser_data_buf *data_buf, *prot_buf; 378 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr; 379 struct scsi_cmnd *sc = task->sc; 380 struct iser_tx_desc *tx_desc = &iser_task->desc; 381 382 edtl = ntohl(hdr->data_length); 383 384 /* build the tx desc regd header and add it to the tx desc dto */ 385 tx_desc->type = ISCSI_TX_SCSI_COMMAND; 386 iser_create_send_desc(ib_conn, tx_desc); 387 388 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 389 data_buf = &iser_task->data[ISER_DIR_IN]; 390 prot_buf = &iser_task->prot[ISER_DIR_IN]; 391 } else { 392 data_buf = &iser_task->data[ISER_DIR_OUT]; 393 prot_buf = &iser_task->prot[ISER_DIR_OUT]; 394 } 395 396 if (scsi_sg_count(sc)) { /* using a scatter list */ 397 data_buf->buf = scsi_sglist(sc); 398 data_buf->size = scsi_sg_count(sc); 399 } 400 data_buf->data_len = scsi_bufflen(sc); 401 402 if (scsi_prot_sg_count(sc)) { 403 prot_buf->buf = scsi_prot_sglist(sc); 404 prot_buf->size = scsi_prot_sg_count(sc); 405 prot_buf->data_len = data_buf->data_len >> 406 ilog2(sc->device->sector_size) * 8; 407 } 408 409 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 410 err = iser_prepare_read_cmd(task); 411 if (err) 412 goto send_command_error; 413 } 414 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { 415 err = iser_prepare_write_cmd(task, 416 task->imm_count, 417 task->imm_count + 418 task->unsol_r2t.data_length, 419 edtl); 420 if (err) 421 goto send_command_error; 422 } 423 424 iser_task->status = ISER_TASK_STATUS_STARTED; 425 426 err = iser_post_send(ib_conn, tx_desc); 427 if (!err) 428 return 0; 429 430 send_command_error: 431 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); 432 return err; 433 } 434 435 /** 436 * iser_send_data_out - send data out PDU 437 */ 438 int iser_send_data_out(struct iscsi_conn *conn, 439 struct iscsi_task *task, 440 struct iscsi_data *hdr) 441 { 442 struct iser_conn *ib_conn = conn->dd_data; 443 struct iscsi_iser_task *iser_task = task->dd_data; 444 struct iser_tx_desc *tx_desc = NULL; 445 struct iser_regd_buf *regd_buf; 446 unsigned long buf_offset; 447 unsigned long data_seg_len; 448 uint32_t itt; 449 int err = 0; 450 struct ib_sge *tx_dsg; 451 452 itt = (__force uint32_t)hdr->itt; 453 data_seg_len = ntoh24(hdr->dlength); 454 buf_offset = ntohl(hdr->offset); 455 456 iser_dbg("%s itt %d dseg_len %d offset %d\n", 457 __func__,(int)itt,(int)data_seg_len,(int)buf_offset); 458 459 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); 460 if (tx_desc == NULL) { 461 iser_err("Failed to alloc desc for post dataout\n"); 462 return -ENOMEM; 463 } 464 465 tx_desc->type = ISCSI_TX_DATAOUT; 466 tx_desc->iser_header.flags = ISER_VER; 467 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); 468 469 /* build the tx desc */ 470 iser_initialize_task_headers(task, tx_desc); 471 472 regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; 473 tx_dsg = &tx_desc->tx_sg[1]; 474 tx_dsg->addr = regd_buf->reg.va + buf_offset; 475 tx_dsg->length = data_seg_len; 476 tx_dsg->lkey = regd_buf->reg.lkey; 477 tx_desc->num_sge = 2; 478 479 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { 480 iser_err("Offset:%ld & DSL:%ld in Data-Out " 481 "inconsistent with total len:%ld, itt:%d\n", 482 buf_offset, data_seg_len, 483 iser_task->data[ISER_DIR_OUT].data_len, itt); 484 err = -EINVAL; 485 goto send_data_out_error; 486 } 487 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", 488 itt, buf_offset, data_seg_len); 489 490 491 err = iser_post_send(ib_conn, tx_desc); 492 if (!err) 493 return 0; 494 495 send_data_out_error: 496 kmem_cache_free(ig.desc_cache, tx_desc); 497 iser_err("conn %p failed err %d\n",conn, err); 498 return err; 499 } 500 501 int iser_send_control(struct iscsi_conn *conn, 502 struct iscsi_task *task) 503 { 504 struct iser_conn *ib_conn = conn->dd_data; 505 struct iscsi_iser_task *iser_task = task->dd_data; 506 struct iser_tx_desc *mdesc = &iser_task->desc; 507 unsigned long data_seg_len; 508 int err = 0; 509 struct iser_device *device; 510 511 /* build the tx desc regd header and add it to the tx desc dto */ 512 mdesc->type = ISCSI_TX_CONTROL; 513 iser_create_send_desc(ib_conn, mdesc); 514 515 device = ib_conn->device; 516 517 data_seg_len = ntoh24(task->hdr->dlength); 518 519 if (data_seg_len > 0) { 520 struct ib_sge *tx_dsg = &mdesc->tx_sg[1]; 521 if (task != conn->login_task) { 522 iser_err("data present on non login task!!!\n"); 523 goto send_control_error; 524 } 525 526 ib_dma_sync_single_for_cpu(device->ib_device, 527 ib_conn->login_req_dma, task->data_count, 528 DMA_TO_DEVICE); 529 530 memcpy(ib_conn->login_req_buf, task->data, task->data_count); 531 532 ib_dma_sync_single_for_device(device->ib_device, 533 ib_conn->login_req_dma, task->data_count, 534 DMA_TO_DEVICE); 535 536 tx_dsg->addr = ib_conn->login_req_dma; 537 tx_dsg->length = task->data_count; 538 tx_dsg->lkey = device->mr->lkey; 539 mdesc->num_sge = 2; 540 } 541 542 if (task == conn->login_task) { 543 iser_dbg("op %x dsl %lx, posting login rx buffer\n", 544 task->hdr->opcode, data_seg_len); 545 err = iser_post_recvl(ib_conn); 546 if (err) 547 goto send_control_error; 548 err = iser_post_rx_bufs(conn, task->hdr); 549 if (err) 550 goto send_control_error; 551 } 552 553 err = iser_post_send(ib_conn, mdesc); 554 if (!err) 555 return 0; 556 557 send_control_error: 558 iser_err("conn %p failed err %d\n",conn, err); 559 return err; 560 } 561 562 /** 563 * iser_rcv_dto_completion - recv DTO completion 564 */ 565 void iser_rcv_completion(struct iser_rx_desc *rx_desc, 566 unsigned long rx_xfer_len, 567 struct iser_conn *ib_conn) 568 { 569 struct iscsi_hdr *hdr; 570 u64 rx_dma; 571 int rx_buflen, outstanding, count, err; 572 573 /* differentiate between login to all other PDUs */ 574 if ((char *)rx_desc == ib_conn->login_resp_buf) { 575 rx_dma = ib_conn->login_resp_dma; 576 rx_buflen = ISER_RX_LOGIN_SIZE; 577 } else { 578 rx_dma = rx_desc->dma_addr; 579 rx_buflen = ISER_RX_PAYLOAD_SIZE; 580 } 581 582 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma, 583 rx_buflen, DMA_FROM_DEVICE); 584 585 hdr = &rx_desc->iscsi_header; 586 587 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 588 hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN)); 589 590 iscsi_iser_recv(ib_conn->iscsi_conn, hdr, rx_desc->data, 591 rx_xfer_len - ISER_HEADERS_LEN); 592 593 ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma, 594 rx_buflen, DMA_FROM_DEVICE); 595 596 /* decrementing conn->post_recv_buf_count only --after-- freeing the * 597 * task eliminates the need to worry on tasks which are completed in * 598 * parallel to the execution of iser_conn_term. So the code that waits * 599 * for the posted rx bufs refcount to become zero handles everything */ 600 ib_conn->post_recv_buf_count--; 601 602 if (rx_dma == ib_conn->login_resp_dma) 603 return; 604 605 outstanding = ib_conn->post_recv_buf_count; 606 if (outstanding + ib_conn->min_posted_rx <= ib_conn->qp_max_recv_dtos) { 607 count = min(ib_conn->qp_max_recv_dtos - outstanding, 608 ib_conn->min_posted_rx); 609 err = iser_post_recvm(ib_conn, count); 610 if (err) 611 iser_err("posting %d rx bufs err %d\n", count, err); 612 } 613 } 614 615 void iser_snd_completion(struct iser_tx_desc *tx_desc, 616 struct iser_conn *ib_conn) 617 { 618 struct iscsi_task *task; 619 struct iser_device *device = ib_conn->device; 620 621 if (tx_desc->type == ISCSI_TX_DATAOUT) { 622 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr, 623 ISER_HEADERS_LEN, DMA_TO_DEVICE); 624 kmem_cache_free(ig.desc_cache, tx_desc); 625 tx_desc = NULL; 626 } 627 628 atomic_dec(&ib_conn->post_send_buf_count); 629 630 if (tx_desc && tx_desc->type == ISCSI_TX_CONTROL) { 631 /* this arithmetic is legal by libiscsi dd_data allocation */ 632 task = (void *) ((long)(void *)tx_desc - 633 sizeof(struct iscsi_task)); 634 if (task->hdr->itt == RESERVED_ITT) 635 iscsi_put_task(task); 636 } 637 } 638 639 void iser_task_rdma_init(struct iscsi_iser_task *iser_task) 640 641 { 642 iser_task->status = ISER_TASK_STATUS_INIT; 643 644 iser_task->dir[ISER_DIR_IN] = 0; 645 iser_task->dir[ISER_DIR_OUT] = 0; 646 647 iser_task->data[ISER_DIR_IN].data_len = 0; 648 iser_task->data[ISER_DIR_OUT].data_len = 0; 649 650 iser_task->prot[ISER_DIR_IN].data_len = 0; 651 iser_task->prot[ISER_DIR_OUT].data_len = 0; 652 653 memset(&iser_task->rdma_regd[ISER_DIR_IN], 0, 654 sizeof(struct iser_regd_buf)); 655 memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0, 656 sizeof(struct iser_regd_buf)); 657 } 658 659 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) 660 { 661 struct iser_device *device = iser_task->ib_conn->device; 662 int is_rdma_data_aligned = 1; 663 int is_rdma_prot_aligned = 1; 664 int prot_count = scsi_prot_sg_count(iser_task->sc); 665 666 /* if we were reading, copy back to unaligned sglist, 667 * anyway dma_unmap and free the copy 668 */ 669 if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) { 670 is_rdma_data_aligned = 0; 671 iser_finalize_rdma_unaligned_sg(iser_task, 672 &iser_task->data[ISER_DIR_IN], 673 &iser_task->data_copy[ISER_DIR_IN], 674 ISER_DIR_IN); 675 } 676 677 if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) { 678 is_rdma_data_aligned = 0; 679 iser_finalize_rdma_unaligned_sg(iser_task, 680 &iser_task->data[ISER_DIR_OUT], 681 &iser_task->data_copy[ISER_DIR_OUT], 682 ISER_DIR_OUT); 683 } 684 685 if (iser_task->prot_copy[ISER_DIR_IN].copy_buf != NULL) { 686 is_rdma_prot_aligned = 0; 687 iser_finalize_rdma_unaligned_sg(iser_task, 688 &iser_task->prot[ISER_DIR_IN], 689 &iser_task->prot_copy[ISER_DIR_IN], 690 ISER_DIR_IN); 691 } 692 693 if (iser_task->prot_copy[ISER_DIR_OUT].copy_buf != NULL) { 694 is_rdma_prot_aligned = 0; 695 iser_finalize_rdma_unaligned_sg(iser_task, 696 &iser_task->prot[ISER_DIR_OUT], 697 &iser_task->prot_copy[ISER_DIR_OUT], 698 ISER_DIR_OUT); 699 } 700 701 if (iser_task->dir[ISER_DIR_IN]) { 702 device->iser_unreg_rdma_mem(iser_task, ISER_DIR_IN); 703 if (is_rdma_data_aligned) 704 iser_dma_unmap_task_data(iser_task, 705 &iser_task->data[ISER_DIR_IN]); 706 if (prot_count && is_rdma_prot_aligned) 707 iser_dma_unmap_task_data(iser_task, 708 &iser_task->prot[ISER_DIR_IN]); 709 } 710 711 if (iser_task->dir[ISER_DIR_OUT]) { 712 device->iser_unreg_rdma_mem(iser_task, ISER_DIR_OUT); 713 if (is_rdma_data_aligned) 714 iser_dma_unmap_task_data(iser_task, 715 &iser_task->data[ISER_DIR_OUT]); 716 if (prot_count && is_rdma_prot_aligned) 717 iser_dma_unmap_task_data(iser_task, 718 &iser_task->prot[ISER_DIR_OUT]); 719 } 720 } 721