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 */ 48static 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_hdr *hdr = &iser_task->desc.iser_header; 55 struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN]; 56 57 err = iser_dma_map_task_data(iser_task, 58 buf_in, 59 ISER_DIR_IN, 60 DMA_FROM_DEVICE); 61 if (err) 62 return err; 63 64 if (scsi_prot_sg_count(iser_task->sc)) { 65 struct iser_data_buf *pbuf_in = &iser_task->prot[ISER_DIR_IN]; 66 67 err = iser_dma_map_task_data(iser_task, 68 pbuf_in, 69 ISER_DIR_IN, 70 DMA_FROM_DEVICE); 71 if (err) 72 return err; 73 } 74 75 err = iser_reg_rdma_mem(iser_task, ISER_DIR_IN); 76 if (err) { 77 iser_err("Failed to set up Data-IN RDMA\n"); 78 return err; 79 } 80 mem_reg = &iser_task->rdma_reg[ISER_DIR_IN]; 81 82 hdr->flags |= ISER_RSV; 83 hdr->read_stag = cpu_to_be32(mem_reg->rkey); 84 hdr->read_va = cpu_to_be64(mem_reg->sge.addr); 85 86 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n", 87 task->itt, mem_reg->rkey, 88 (unsigned long long)mem_reg->sge.addr); 89 90 return 0; 91} 92 93/* Register user buffer memory and initialize passive rdma 94 * dto descriptor. Data size is stored in 95 * task->data[ISER_DIR_OUT].data_len, Protection size 96 * is stored at task->prot[ISER_DIR_OUT].data_len 97 */ 98static int 99iser_prepare_write_cmd(struct iscsi_task *task, 100 unsigned int imm_sz, 101 unsigned int unsol_sz, 102 unsigned int edtl) 103{ 104 struct iscsi_iser_task *iser_task = task->dd_data; 105 struct iser_mem_reg *mem_reg; 106 int err; 107 struct iser_hdr *hdr = &iser_task->desc.iser_header; 108 struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT]; 109 struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1]; 110 111 err = iser_dma_map_task_data(iser_task, 112 buf_out, 113 ISER_DIR_OUT, 114 DMA_TO_DEVICE); 115 if (err) 116 return err; 117 118 if (scsi_prot_sg_count(iser_task->sc)) { 119 struct iser_data_buf *pbuf_out = &iser_task->prot[ISER_DIR_OUT]; 120 121 err = iser_dma_map_task_data(iser_task, 122 pbuf_out, 123 ISER_DIR_OUT, 124 DMA_TO_DEVICE); 125 if (err) 126 return err; 127 } 128 129 err = iser_reg_rdma_mem(iser_task, ISER_DIR_OUT); 130 if (err != 0) { 131 iser_err("Failed to register write cmd RDMA mem\n"); 132 return err; 133 } 134 135 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT]; 136 137 if (unsol_sz < edtl) { 138 hdr->flags |= ISER_WSV; 139 hdr->write_stag = cpu_to_be32(mem_reg->rkey); 140 hdr->write_va = cpu_to_be64(mem_reg->sge.addr + unsol_sz); 141 142 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X " 143 "VA:%#llX + unsol:%d\n", 144 task->itt, mem_reg->rkey, 145 (unsigned long long)mem_reg->sge.addr, unsol_sz); 146 } 147 148 if (imm_sz > 0) { 149 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n", 150 task->itt, imm_sz); 151 tx_dsg->addr = mem_reg->sge.addr; 152 tx_dsg->length = imm_sz; 153 tx_dsg->lkey = mem_reg->sge.lkey; 154 iser_task->desc.num_sge = 2; 155 } 156 157 return 0; 158} 159 160/* creates a new tx descriptor and adds header regd buffer */ 161static void iser_create_send_desc(struct iser_conn *iser_conn, 162 struct iser_tx_desc *tx_desc) 163{ 164 struct iser_device *device = iser_conn->ib_conn.device; 165 166 ib_dma_sync_single_for_cpu(device->ib_device, 167 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 168 169 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); 170 tx_desc->iser_header.flags = ISER_VER; 171 tx_desc->num_sge = 1; 172} 173 174static void iser_free_login_buf(struct iser_conn *iser_conn) 175{ 176 struct iser_device *device = iser_conn->ib_conn.device; 177 178 if (!iser_conn->login_buf) 179 return; 180 181 if (iser_conn->login_req_dma) 182 ib_dma_unmap_single(device->ib_device, 183 iser_conn->login_req_dma, 184 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 185 186 if (iser_conn->login_resp_dma) 187 ib_dma_unmap_single(device->ib_device, 188 iser_conn->login_resp_dma, 189 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 190 191 kfree(iser_conn->login_buf); 192 193 /* make sure we never redo any unmapping */ 194 iser_conn->login_req_dma = 0; 195 iser_conn->login_resp_dma = 0; 196 iser_conn->login_buf = NULL; 197} 198 199static int iser_alloc_login_buf(struct iser_conn *iser_conn) 200{ 201 struct iser_device *device = iser_conn->ib_conn.device; 202 int req_err, resp_err; 203 204 BUG_ON(device == NULL); 205 206 iser_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN + 207 ISER_RX_LOGIN_SIZE, GFP_KERNEL); 208 if (!iser_conn->login_buf) 209 goto out_err; 210 211 iser_conn->login_req_buf = iser_conn->login_buf; 212 iser_conn->login_resp_buf = iser_conn->login_buf + 213 ISCSI_DEF_MAX_RECV_SEG_LEN; 214 215 iser_conn->login_req_dma = ib_dma_map_single(device->ib_device, 216 iser_conn->login_req_buf, 217 ISCSI_DEF_MAX_RECV_SEG_LEN, 218 DMA_TO_DEVICE); 219 220 iser_conn->login_resp_dma = ib_dma_map_single(device->ib_device, 221 iser_conn->login_resp_buf, 222 ISER_RX_LOGIN_SIZE, 223 DMA_FROM_DEVICE); 224 225 req_err = ib_dma_mapping_error(device->ib_device, 226 iser_conn->login_req_dma); 227 resp_err = ib_dma_mapping_error(device->ib_device, 228 iser_conn->login_resp_dma); 229 230 if (req_err || resp_err) { 231 if (req_err) 232 iser_conn->login_req_dma = 0; 233 if (resp_err) 234 iser_conn->login_resp_dma = 0; 235 goto free_login_buf; 236 } 237 return 0; 238 239free_login_buf: 240 iser_free_login_buf(iser_conn); 241 242out_err: 243 iser_err("unable to alloc or map login buf\n"); 244 return -ENOMEM; 245} 246 247int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, 248 struct iscsi_session *session) 249{ 250 int i, j; 251 u64 dma_addr; 252 struct iser_rx_desc *rx_desc; 253 struct ib_sge *rx_sg; 254 struct ib_conn *ib_conn = &iser_conn->ib_conn; 255 struct iser_device *device = ib_conn->device; 256 257 iser_conn->qp_max_recv_dtos = session->cmds_max; 258 iser_conn->qp_max_recv_dtos_mask = session->cmds_max - 1; /* cmds_max is 2^N */ 259 iser_conn->min_posted_rx = iser_conn->qp_max_recv_dtos >> 2; 260 261 if (device->reg_ops->alloc_reg_res(ib_conn, session->scsi_cmds_max, 262 iser_conn->scsi_sg_tablesize)) 263 goto create_rdma_reg_res_failed; 264 265 if (iser_alloc_login_buf(iser_conn)) 266 goto alloc_login_buf_fail; 267 268 iser_conn->num_rx_descs = session->cmds_max; 269 iser_conn->rx_descs = kmalloc(iser_conn->num_rx_descs * 270 sizeof(struct iser_rx_desc), GFP_KERNEL); 271 if (!iser_conn->rx_descs) 272 goto rx_desc_alloc_fail; 273 274 rx_desc = iser_conn->rx_descs; 275 276 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) { 277 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc, 278 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 279 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 280 goto rx_desc_dma_map_failed; 281 282 rx_desc->dma_addr = dma_addr; 283 284 rx_sg = &rx_desc->rx_sg; 285 rx_sg->addr = rx_desc->dma_addr; 286 rx_sg->length = ISER_RX_PAYLOAD_SIZE; 287 rx_sg->lkey = device->pd->local_dma_lkey; 288 } 289 290 iser_conn->rx_desc_head = 0; 291 return 0; 292 293rx_desc_dma_map_failed: 294 rx_desc = iser_conn->rx_descs; 295 for (j = 0; j < i; j++, rx_desc++) 296 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 297 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 298 kfree(iser_conn->rx_descs); 299 iser_conn->rx_descs = NULL; 300rx_desc_alloc_fail: 301 iser_free_login_buf(iser_conn); 302alloc_login_buf_fail: 303 device->reg_ops->free_reg_res(ib_conn); 304create_rdma_reg_res_failed: 305 iser_err("failed allocating rx descriptors / data buffers\n"); 306 return -ENOMEM; 307} 308 309void iser_free_rx_descriptors(struct iser_conn *iser_conn) 310{ 311 int i; 312 struct iser_rx_desc *rx_desc; 313 struct ib_conn *ib_conn = &iser_conn->ib_conn; 314 struct iser_device *device = ib_conn->device; 315 316 if (device->reg_ops->free_reg_res) 317 device->reg_ops->free_reg_res(ib_conn); 318 319 rx_desc = iser_conn->rx_descs; 320 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) 321 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 322 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 323 kfree(iser_conn->rx_descs); 324 /* make sure we never redo any unmapping */ 325 iser_conn->rx_descs = NULL; 326 327 iser_free_login_buf(iser_conn); 328} 329 330static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req) 331{ 332 struct iser_conn *iser_conn = conn->dd_data; 333 struct ib_conn *ib_conn = &iser_conn->ib_conn; 334 struct iscsi_session *session = conn->session; 335 336 iser_dbg("req op %x flags %x\n", req->opcode, req->flags); 337 /* check if this is the last login - going to full feature phase */ 338 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE) 339 return 0; 340 341 /* 342 * Check that there is one posted recv buffer 343 * (for the last login response). 344 */ 345 WARN_ON(ib_conn->post_recv_buf_count != 1); 346 347 if (session->discovery_sess) { 348 iser_info("Discovery session, re-using login RX buffer\n"); 349 return 0; 350 } else 351 iser_info("Normal session, posting batch of RX %d buffers\n", 352 iser_conn->min_posted_rx); 353 354 /* Initial post receive buffers */ 355 if (iser_post_recvm(iser_conn, iser_conn->min_posted_rx)) 356 return -ENOMEM; 357 358 return 0; 359} 360 361static inline bool iser_signal_comp(u8 sig_count) 362{ 363 return ((sig_count % ISER_SIGNAL_CMD_COUNT) == 0); 364} 365 366/** 367 * iser_send_command - send command PDU 368 */ 369int iser_send_command(struct iscsi_conn *conn, 370 struct iscsi_task *task) 371{ 372 struct iser_conn *iser_conn = conn->dd_data; 373 struct iscsi_iser_task *iser_task = task->dd_data; 374 unsigned long edtl; 375 int err; 376 struct iser_data_buf *data_buf, *prot_buf; 377 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr; 378 struct scsi_cmnd *sc = task->sc; 379 struct iser_tx_desc *tx_desc = &iser_task->desc; 380 u8 sig_count = ++iser_conn->ib_conn.sig_count; 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(iser_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->sg = 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->sg = 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(&iser_conn->ib_conn, tx_desc, 427 iser_signal_comp(sig_count)); 428 if (!err) 429 return 0; 430 431send_command_error: 432 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); 433 return err; 434} 435 436/** 437 * iser_send_data_out - send data out PDU 438 */ 439int iser_send_data_out(struct iscsi_conn *conn, 440 struct iscsi_task *task, 441 struct iscsi_data *hdr) 442{ 443 struct iser_conn *iser_conn = conn->dd_data; 444 struct iscsi_iser_task *iser_task = task->dd_data; 445 struct iser_tx_desc *tx_desc = NULL; 446 struct iser_mem_reg *mem_reg; 447 unsigned long buf_offset; 448 unsigned long data_seg_len; 449 uint32_t itt; 450 int err; 451 struct ib_sge *tx_dsg; 452 453 itt = (__force uint32_t)hdr->itt; 454 data_seg_len = ntoh24(hdr->dlength); 455 buf_offset = ntohl(hdr->offset); 456 457 iser_dbg("%s itt %d dseg_len %d offset %d\n", 458 __func__,(int)itt,(int)data_seg_len,(int)buf_offset); 459 460 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); 461 if (tx_desc == NULL) { 462 iser_err("Failed to alloc desc for post dataout\n"); 463 return -ENOMEM; 464 } 465 466 tx_desc->type = ISCSI_TX_DATAOUT; 467 tx_desc->iser_header.flags = ISER_VER; 468 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); 469 470 /* build the tx desc */ 471 err = iser_initialize_task_headers(task, tx_desc); 472 if (err) 473 goto send_data_out_error; 474 475 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT]; 476 tx_dsg = &tx_desc->tx_sg[1]; 477 tx_dsg->addr = mem_reg->sge.addr + buf_offset; 478 tx_dsg->length = data_seg_len; 479 tx_dsg->lkey = mem_reg->sge.lkey; 480 tx_desc->num_sge = 2; 481 482 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { 483 iser_err("Offset:%ld & DSL:%ld in Data-Out " 484 "inconsistent with total len:%ld, itt:%d\n", 485 buf_offset, data_seg_len, 486 iser_task->data[ISER_DIR_OUT].data_len, itt); 487 err = -EINVAL; 488 goto send_data_out_error; 489 } 490 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", 491 itt, buf_offset, data_seg_len); 492 493 494 err = iser_post_send(&iser_conn->ib_conn, tx_desc, true); 495 if (!err) 496 return 0; 497 498send_data_out_error: 499 kmem_cache_free(ig.desc_cache, tx_desc); 500 iser_err("conn %p failed err %d\n", conn, err); 501 return err; 502} 503 504int iser_send_control(struct iscsi_conn *conn, 505 struct iscsi_task *task) 506{ 507 struct iser_conn *iser_conn = conn->dd_data; 508 struct iscsi_iser_task *iser_task = task->dd_data; 509 struct iser_tx_desc *mdesc = &iser_task->desc; 510 unsigned long data_seg_len; 511 int err = 0; 512 struct iser_device *device; 513 514 /* build the tx desc regd header and add it to the tx desc dto */ 515 mdesc->type = ISCSI_TX_CONTROL; 516 iser_create_send_desc(iser_conn, mdesc); 517 518 device = iser_conn->ib_conn.device; 519 520 data_seg_len = ntoh24(task->hdr->dlength); 521 522 if (data_seg_len > 0) { 523 struct ib_sge *tx_dsg = &mdesc->tx_sg[1]; 524 if (task != conn->login_task) { 525 iser_err("data present on non login task!!!\n"); 526 goto send_control_error; 527 } 528 529 ib_dma_sync_single_for_cpu(device->ib_device, 530 iser_conn->login_req_dma, task->data_count, 531 DMA_TO_DEVICE); 532 533 memcpy(iser_conn->login_req_buf, task->data, task->data_count); 534 535 ib_dma_sync_single_for_device(device->ib_device, 536 iser_conn->login_req_dma, task->data_count, 537 DMA_TO_DEVICE); 538 539 tx_dsg->addr = iser_conn->login_req_dma; 540 tx_dsg->length = task->data_count; 541 tx_dsg->lkey = device->pd->local_dma_lkey; 542 mdesc->num_sge = 2; 543 } 544 545 if (task == conn->login_task) { 546 iser_dbg("op %x dsl %lx, posting login rx buffer\n", 547 task->hdr->opcode, data_seg_len); 548 err = iser_post_recvl(iser_conn); 549 if (err) 550 goto send_control_error; 551 err = iser_post_rx_bufs(conn, task->hdr); 552 if (err) 553 goto send_control_error; 554 } 555 556 err = iser_post_send(&iser_conn->ib_conn, mdesc, true); 557 if (!err) 558 return 0; 559 560send_control_error: 561 iser_err("conn %p failed err %d\n",conn, err); 562 return err; 563} 564 565/** 566 * iser_rcv_dto_completion - recv DTO completion 567 */ 568void iser_rcv_completion(struct iser_rx_desc *rx_desc, 569 unsigned long rx_xfer_len, 570 struct ib_conn *ib_conn) 571{ 572 struct iser_conn *iser_conn = container_of(ib_conn, struct iser_conn, 573 ib_conn); 574 struct iscsi_hdr *hdr; 575 u64 rx_dma; 576 int rx_buflen, outstanding, count, err; 577 578 /* differentiate between login to all other PDUs */ 579 if ((char *)rx_desc == iser_conn->login_resp_buf) { 580 rx_dma = iser_conn->login_resp_dma; 581 rx_buflen = ISER_RX_LOGIN_SIZE; 582 } else { 583 rx_dma = rx_desc->dma_addr; 584 rx_buflen = ISER_RX_PAYLOAD_SIZE; 585 } 586 587 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma, 588 rx_buflen, DMA_FROM_DEVICE); 589 590 hdr = &rx_desc->iscsi_header; 591 592 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 593 hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN)); 594 595 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, rx_desc->data, 596 rx_xfer_len - ISER_HEADERS_LEN); 597 598 ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma, 599 rx_buflen, DMA_FROM_DEVICE); 600 601 /* decrementing conn->post_recv_buf_count only --after-- freeing the * 602 * task eliminates the need to worry on tasks which are completed in * 603 * parallel to the execution of iser_conn_term. So the code that waits * 604 * for the posted rx bufs refcount to become zero handles everything */ 605 ib_conn->post_recv_buf_count--; 606 607 if (rx_dma == iser_conn->login_resp_dma) 608 return; 609 610 outstanding = ib_conn->post_recv_buf_count; 611 if (outstanding + iser_conn->min_posted_rx <= iser_conn->qp_max_recv_dtos) { 612 count = min(iser_conn->qp_max_recv_dtos - outstanding, 613 iser_conn->min_posted_rx); 614 err = iser_post_recvm(iser_conn, count); 615 if (err) 616 iser_err("posting %d rx bufs err %d\n", count, err); 617 } 618} 619 620void iser_snd_completion(struct iser_tx_desc *tx_desc, 621 struct ib_conn *ib_conn) 622{ 623 struct iscsi_task *task; 624 struct iser_device *device = ib_conn->device; 625 626 if (tx_desc->type == ISCSI_TX_DATAOUT) { 627 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr, 628 ISER_HEADERS_LEN, DMA_TO_DEVICE); 629 kmem_cache_free(ig.desc_cache, tx_desc); 630 tx_desc = NULL; 631 } 632 633 if (tx_desc && tx_desc->type == ISCSI_TX_CONTROL) { 634 /* this arithmetic is legal by libiscsi dd_data allocation */ 635 task = (void *) ((long)(void *)tx_desc - 636 sizeof(struct iscsi_task)); 637 if (task->hdr->itt == RESERVED_ITT) 638 iscsi_put_task(task); 639 } 640} 641 642void iser_task_rdma_init(struct iscsi_iser_task *iser_task) 643 644{ 645 iser_task->status = ISER_TASK_STATUS_INIT; 646 647 iser_task->dir[ISER_DIR_IN] = 0; 648 iser_task->dir[ISER_DIR_OUT] = 0; 649 650 iser_task->data[ISER_DIR_IN].data_len = 0; 651 iser_task->data[ISER_DIR_OUT].data_len = 0; 652 653 iser_task->prot[ISER_DIR_IN].data_len = 0; 654 iser_task->prot[ISER_DIR_OUT].data_len = 0; 655 656 memset(&iser_task->rdma_reg[ISER_DIR_IN], 0, 657 sizeof(struct iser_mem_reg)); 658 memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0, 659 sizeof(struct iser_mem_reg)); 660} 661 662void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) 663{ 664 int prot_count = scsi_prot_sg_count(iser_task->sc); 665 666 if (iser_task->dir[ISER_DIR_IN]) { 667 iser_unreg_rdma_mem(iser_task, ISER_DIR_IN); 668 iser_dma_unmap_task_data(iser_task, 669 &iser_task->data[ISER_DIR_IN], 670 DMA_FROM_DEVICE); 671 if (prot_count) 672 iser_dma_unmap_task_data(iser_task, 673 &iser_task->prot[ISER_DIR_IN], 674 DMA_FROM_DEVICE); 675 } 676 677 if (iser_task->dir[ISER_DIR_OUT]) { 678 iser_unreg_rdma_mem(iser_task, ISER_DIR_OUT); 679 iser_dma_unmap_task_data(iser_task, 680 &iser_task->data[ISER_DIR_OUT], 681 DMA_TO_DEVICE); 682 if (prot_count) 683 iser_dma_unmap_task_data(iser_task, 684 &iser_task->prot[ISER_DIR_OUT], 685 DMA_TO_DEVICE); 686 } 687} 688