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. 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->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 if (edtl > iser_task->data[ISER_DIR_IN].data_len) { 77 iser_err("Total data length: %ld, less than EDTL: " 78 "%d, in READ cmd BHS itt: %d, conn: 0x%p\n", 79 iser_task->data[ISER_DIR_IN].data_len, edtl, 80 task->itt, iser_task->ib_conn); 81 return -EINVAL; 82 } 83 84 err = device->iser_reg_rdma_mem(iser_task, ISER_DIR_IN); 85 if (err) { 86 iser_err("Failed to set up Data-IN RDMA\n"); 87 return err; 88 } 89 regd_buf = &iser_task->rdma_regd[ISER_DIR_IN]; 90 91 hdr->flags |= ISER_RSV; 92 hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey); 93 hdr->read_va = cpu_to_be64(regd_buf->reg.va); 94 95 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n", 96 task->itt, regd_buf->reg.rkey, 97 (unsigned long long)regd_buf->reg.va); 98 99 return 0; 100 } 101 102 /* Register user buffer memory and initialize passive rdma 103 * dto descriptor. Total data size is stored in 104 * task->data[ISER_DIR_OUT].data_len 105 */ 106 static int 107 iser_prepare_write_cmd(struct iscsi_task *task, 108 unsigned int imm_sz, 109 unsigned int unsol_sz, 110 unsigned int edtl) 111 { 112 struct iscsi_iser_task *iser_task = task->dd_data; 113 struct iser_device *device = iser_task->ib_conn->device; 114 struct iser_regd_buf *regd_buf; 115 int err; 116 struct iser_hdr *hdr = &iser_task->desc.iser_header; 117 struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT]; 118 struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1]; 119 120 err = iser_dma_map_task_data(iser_task, 121 buf_out, 122 ISER_DIR_OUT, 123 DMA_TO_DEVICE); 124 if (err) 125 return err; 126 127 if (scsi_prot_sg_count(iser_task->sc)) { 128 struct iser_data_buf *pbuf_out = &iser_task->prot[ISER_DIR_OUT]; 129 130 err = iser_dma_map_task_data(iser_task, 131 pbuf_out, 132 ISER_DIR_OUT, 133 DMA_TO_DEVICE); 134 if (err) 135 return err; 136 } 137 138 if (edtl > iser_task->data[ISER_DIR_OUT].data_len) { 139 iser_err("Total data length: %ld, less than EDTL: %d, " 140 "in WRITE cmd BHS itt: %d, conn: 0x%p\n", 141 iser_task->data[ISER_DIR_OUT].data_len, 142 edtl, task->itt, task->conn); 143 return -EINVAL; 144 } 145 146 err = device->iser_reg_rdma_mem(iser_task, ISER_DIR_OUT); 147 if (err != 0) { 148 iser_err("Failed to register write cmd RDMA mem\n"); 149 return err; 150 } 151 152 regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; 153 154 if (unsol_sz < edtl) { 155 hdr->flags |= ISER_WSV; 156 hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey); 157 hdr->write_va = cpu_to_be64(regd_buf->reg.va + unsol_sz); 158 159 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X " 160 "VA:%#llX + unsol:%d\n", 161 task->itt, regd_buf->reg.rkey, 162 (unsigned long long)regd_buf->reg.va, unsol_sz); 163 } 164 165 if (imm_sz > 0) { 166 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n", 167 task->itt, imm_sz); 168 tx_dsg->addr = regd_buf->reg.va; 169 tx_dsg->length = imm_sz; 170 tx_dsg->lkey = regd_buf->reg.lkey; 171 iser_task->desc.num_sge = 2; 172 } 173 174 return 0; 175 } 176 177 /* creates a new tx descriptor and adds header regd buffer */ 178 static void iser_create_send_desc(struct iser_conn *ib_conn, 179 struct iser_tx_desc *tx_desc) 180 { 181 struct iser_device *device = ib_conn->device; 182 183 ib_dma_sync_single_for_cpu(device->ib_device, 184 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 185 186 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); 187 tx_desc->iser_header.flags = ISER_VER; 188 189 tx_desc->num_sge = 1; 190 191 if (tx_desc->tx_sg[0].lkey != device->mr->lkey) { 192 tx_desc->tx_sg[0].lkey = device->mr->lkey; 193 iser_dbg("sdesc %p lkey mismatch, fixing\n", tx_desc); 194 } 195 } 196 197 static void iser_free_login_buf(struct iser_conn *ib_conn) 198 { 199 if (!ib_conn->login_buf) 200 return; 201 202 if (ib_conn->login_req_dma) 203 ib_dma_unmap_single(ib_conn->device->ib_device, 204 ib_conn->login_req_dma, 205 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 206 207 if (ib_conn->login_resp_dma) 208 ib_dma_unmap_single(ib_conn->device->ib_device, 209 ib_conn->login_resp_dma, 210 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 211 212 kfree(ib_conn->login_buf); 213 214 /* make sure we never redo any unmapping */ 215 ib_conn->login_req_dma = 0; 216 ib_conn->login_resp_dma = 0; 217 ib_conn->login_buf = NULL; 218 } 219 220 static int iser_alloc_login_buf(struct iser_conn *ib_conn) 221 { 222 struct iser_device *device; 223 int req_err, resp_err; 224 225 BUG_ON(ib_conn->device == NULL); 226 227 device = ib_conn->device; 228 229 ib_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN + 230 ISER_RX_LOGIN_SIZE, GFP_KERNEL); 231 if (!ib_conn->login_buf) 232 goto out_err; 233 234 ib_conn->login_req_buf = ib_conn->login_buf; 235 ib_conn->login_resp_buf = ib_conn->login_buf + 236 ISCSI_DEF_MAX_RECV_SEG_LEN; 237 238 ib_conn->login_req_dma = ib_dma_map_single(ib_conn->device->ib_device, 239 (void *)ib_conn->login_req_buf, 240 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 241 242 ib_conn->login_resp_dma = ib_dma_map_single(ib_conn->device->ib_device, 243 (void *)ib_conn->login_resp_buf, 244 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 245 246 req_err = ib_dma_mapping_error(device->ib_device, 247 ib_conn->login_req_dma); 248 resp_err = ib_dma_mapping_error(device->ib_device, 249 ib_conn->login_resp_dma); 250 251 if (req_err || resp_err) { 252 if (req_err) 253 ib_conn->login_req_dma = 0; 254 if (resp_err) 255 ib_conn->login_resp_dma = 0; 256 goto free_login_buf; 257 } 258 return 0; 259 260 free_login_buf: 261 iser_free_login_buf(ib_conn); 262 263 out_err: 264 iser_err("unable to alloc or map login buf\n"); 265 return -ENOMEM; 266 } 267 268 int iser_alloc_rx_descriptors(struct iser_conn *ib_conn, struct iscsi_session *session) 269 { 270 int i, j; 271 u64 dma_addr; 272 struct iser_rx_desc *rx_desc; 273 struct ib_sge *rx_sg; 274 struct iser_device *device = ib_conn->device; 275 276 ib_conn->qp_max_recv_dtos = session->cmds_max; 277 ib_conn->qp_max_recv_dtos_mask = session->cmds_max - 1; /* cmds_max is 2^N */ 278 ib_conn->min_posted_rx = ib_conn->qp_max_recv_dtos >> 2; 279 280 if (device->iser_alloc_rdma_reg_res(ib_conn, session->scsi_cmds_max)) 281 goto create_rdma_reg_res_failed; 282 283 if (iser_alloc_login_buf(ib_conn)) 284 goto alloc_login_buf_fail; 285 286 ib_conn->rx_descs = kmalloc(session->cmds_max * 287 sizeof(struct iser_rx_desc), GFP_KERNEL); 288 if (!ib_conn->rx_descs) 289 goto rx_desc_alloc_fail; 290 291 rx_desc = ib_conn->rx_descs; 292 293 for (i = 0; i < ib_conn->qp_max_recv_dtos; i++, rx_desc++) { 294 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc, 295 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 296 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 297 goto rx_desc_dma_map_failed; 298 299 rx_desc->dma_addr = dma_addr; 300 301 rx_sg = &rx_desc->rx_sg; 302 rx_sg->addr = rx_desc->dma_addr; 303 rx_sg->length = ISER_RX_PAYLOAD_SIZE; 304 rx_sg->lkey = device->mr->lkey; 305 } 306 307 ib_conn->rx_desc_head = 0; 308 return 0; 309 310 rx_desc_dma_map_failed: 311 rx_desc = ib_conn->rx_descs; 312 for (j = 0; j < i; j++, rx_desc++) 313 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 314 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 315 kfree(ib_conn->rx_descs); 316 ib_conn->rx_descs = NULL; 317 rx_desc_alloc_fail: 318 iser_free_login_buf(ib_conn); 319 alloc_login_buf_fail: 320 device->iser_free_rdma_reg_res(ib_conn); 321 create_rdma_reg_res_failed: 322 iser_err("failed allocating rx descriptors / data buffers\n"); 323 return -ENOMEM; 324 } 325 326 void iser_free_rx_descriptors(struct iser_conn *ib_conn) 327 { 328 int i; 329 struct iser_rx_desc *rx_desc; 330 struct iser_device *device = ib_conn->device; 331 332 if (!ib_conn->rx_descs) 333 goto free_login_buf; 334 335 if (device->iser_free_rdma_reg_res) 336 device->iser_free_rdma_reg_res(ib_conn); 337 338 rx_desc = ib_conn->rx_descs; 339 for (i = 0; i < ib_conn->qp_max_recv_dtos; i++, rx_desc++) 340 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 341 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 342 kfree(ib_conn->rx_descs); 343 /* make sure we never redo any unmapping */ 344 ib_conn->rx_descs = NULL; 345 346 free_login_buf: 347 iser_free_login_buf(ib_conn); 348 } 349 350 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req) 351 { 352 struct iser_conn *ib_conn = conn->dd_data; 353 struct iscsi_session *session = conn->session; 354 355 iser_dbg("req op %x flags %x\n", req->opcode, req->flags); 356 /* check if this is the last login - going to full feature phase */ 357 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE) 358 return 0; 359 360 /* 361 * Check that there is one posted recv buffer (for the last login 362 * response) and no posted send buffers left - they must have been 363 * consumed during previous login phases. 364 */ 365 WARN_ON(ib_conn->post_recv_buf_count != 1); 366 WARN_ON(atomic_read(&ib_conn->post_send_buf_count) != 0); 367 368 if (session->discovery_sess) { 369 iser_info("Discovery session, re-using login RX buffer\n"); 370 return 0; 371 } else 372 iser_info("Normal session, posting batch of RX %d buffers\n", 373 ib_conn->min_posted_rx); 374 375 /* Initial post receive buffers */ 376 if (iser_post_recvm(ib_conn, ib_conn->min_posted_rx)) 377 return -ENOMEM; 378 379 return 0; 380 } 381 382 /** 383 * iser_send_command - send command PDU 384 */ 385 int iser_send_command(struct iscsi_conn *conn, 386 struct iscsi_task *task) 387 { 388 struct iser_conn *ib_conn = conn->dd_data; 389 struct iscsi_iser_task *iser_task = task->dd_data; 390 unsigned long edtl; 391 int err; 392 struct iser_data_buf *data_buf, *prot_buf; 393 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr; 394 struct scsi_cmnd *sc = task->sc; 395 struct iser_tx_desc *tx_desc = &iser_task->desc; 396 397 edtl = ntohl(hdr->data_length); 398 399 /* build the tx desc regd header and add it to the tx desc dto */ 400 tx_desc->type = ISCSI_TX_SCSI_COMMAND; 401 iser_create_send_desc(ib_conn, tx_desc); 402 403 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 404 data_buf = &iser_task->data[ISER_DIR_IN]; 405 prot_buf = &iser_task->prot[ISER_DIR_IN]; 406 } else { 407 data_buf = &iser_task->data[ISER_DIR_OUT]; 408 prot_buf = &iser_task->prot[ISER_DIR_OUT]; 409 } 410 411 if (scsi_sg_count(sc)) { /* using a scatter list */ 412 data_buf->buf = scsi_sglist(sc); 413 data_buf->size = scsi_sg_count(sc); 414 } 415 data_buf->data_len = scsi_bufflen(sc); 416 417 if (scsi_prot_sg_count(sc)) { 418 prot_buf->buf = scsi_prot_sglist(sc); 419 prot_buf->size = scsi_prot_sg_count(sc); 420 prot_buf->data_len = sc->prot_sdb->length; 421 } 422 423 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 424 err = iser_prepare_read_cmd(task, edtl); 425 if (err) 426 goto send_command_error; 427 } 428 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { 429 err = iser_prepare_write_cmd(task, 430 task->imm_count, 431 task->imm_count + 432 task->unsol_r2t.data_length, 433 edtl); 434 if (err) 435 goto send_command_error; 436 } 437 438 iser_task->status = ISER_TASK_STATUS_STARTED; 439 440 err = iser_post_send(ib_conn, tx_desc); 441 if (!err) 442 return 0; 443 444 send_command_error: 445 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); 446 return err; 447 } 448 449 /** 450 * iser_send_data_out - send data out PDU 451 */ 452 int iser_send_data_out(struct iscsi_conn *conn, 453 struct iscsi_task *task, 454 struct iscsi_data *hdr) 455 { 456 struct iser_conn *ib_conn = conn->dd_data; 457 struct iscsi_iser_task *iser_task = task->dd_data; 458 struct iser_tx_desc *tx_desc = NULL; 459 struct iser_regd_buf *regd_buf; 460 unsigned long buf_offset; 461 unsigned long data_seg_len; 462 uint32_t itt; 463 int err = 0; 464 struct ib_sge *tx_dsg; 465 466 itt = (__force uint32_t)hdr->itt; 467 data_seg_len = ntoh24(hdr->dlength); 468 buf_offset = ntohl(hdr->offset); 469 470 iser_dbg("%s itt %d dseg_len %d offset %d\n", 471 __func__,(int)itt,(int)data_seg_len,(int)buf_offset); 472 473 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); 474 if (tx_desc == NULL) { 475 iser_err("Failed to alloc desc for post dataout\n"); 476 return -ENOMEM; 477 } 478 479 tx_desc->type = ISCSI_TX_DATAOUT; 480 tx_desc->iser_header.flags = ISER_VER; 481 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); 482 483 /* build the tx desc */ 484 iser_initialize_task_headers(task, tx_desc); 485 486 regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; 487 tx_dsg = &tx_desc->tx_sg[1]; 488 tx_dsg->addr = regd_buf->reg.va + buf_offset; 489 tx_dsg->length = data_seg_len; 490 tx_dsg->lkey = regd_buf->reg.lkey; 491 tx_desc->num_sge = 2; 492 493 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { 494 iser_err("Offset:%ld & DSL:%ld in Data-Out " 495 "inconsistent with total len:%ld, itt:%d\n", 496 buf_offset, data_seg_len, 497 iser_task->data[ISER_DIR_OUT].data_len, itt); 498 err = -EINVAL; 499 goto send_data_out_error; 500 } 501 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", 502 itt, buf_offset, data_seg_len); 503 504 505 err = iser_post_send(ib_conn, tx_desc); 506 if (!err) 507 return 0; 508 509 send_data_out_error: 510 kmem_cache_free(ig.desc_cache, tx_desc); 511 iser_err("conn %p failed err %d\n",conn, err); 512 return err; 513 } 514 515 int iser_send_control(struct iscsi_conn *conn, 516 struct iscsi_task *task) 517 { 518 struct iser_conn *ib_conn = conn->dd_data; 519 struct iscsi_iser_task *iser_task = task->dd_data; 520 struct iser_tx_desc *mdesc = &iser_task->desc; 521 unsigned long data_seg_len; 522 int err = 0; 523 struct iser_device *device; 524 525 /* build the tx desc regd header and add it to the tx desc dto */ 526 mdesc->type = ISCSI_TX_CONTROL; 527 iser_create_send_desc(ib_conn, mdesc); 528 529 device = ib_conn->device; 530 531 data_seg_len = ntoh24(task->hdr->dlength); 532 533 if (data_seg_len > 0) { 534 struct ib_sge *tx_dsg = &mdesc->tx_sg[1]; 535 if (task != conn->login_task) { 536 iser_err("data present on non login task!!!\n"); 537 goto send_control_error; 538 } 539 540 ib_dma_sync_single_for_cpu(device->ib_device, 541 ib_conn->login_req_dma, task->data_count, 542 DMA_TO_DEVICE); 543 544 memcpy(ib_conn->login_req_buf, task->data, task->data_count); 545 546 ib_dma_sync_single_for_device(device->ib_device, 547 ib_conn->login_req_dma, task->data_count, 548 DMA_TO_DEVICE); 549 550 tx_dsg->addr = ib_conn->login_req_dma; 551 tx_dsg->length = task->data_count; 552 tx_dsg->lkey = device->mr->lkey; 553 mdesc->num_sge = 2; 554 } 555 556 if (task == conn->login_task) { 557 iser_dbg("op %x dsl %lx, posting login rx buffer\n", 558 task->hdr->opcode, data_seg_len); 559 err = iser_post_recvl(ib_conn); 560 if (err) 561 goto send_control_error; 562 err = iser_post_rx_bufs(conn, task->hdr); 563 if (err) 564 goto send_control_error; 565 } 566 567 err = iser_post_send(ib_conn, mdesc); 568 if (!err) 569 return 0; 570 571 send_control_error: 572 iser_err("conn %p failed err %d\n",conn, err); 573 return err; 574 } 575 576 /** 577 * iser_rcv_dto_completion - recv DTO completion 578 */ 579 void iser_rcv_completion(struct iser_rx_desc *rx_desc, 580 unsigned long rx_xfer_len, 581 struct iser_conn *ib_conn) 582 { 583 struct iscsi_hdr *hdr; 584 u64 rx_dma; 585 int rx_buflen, outstanding, count, err; 586 587 /* differentiate between login to all other PDUs */ 588 if ((char *)rx_desc == ib_conn->login_resp_buf) { 589 rx_dma = ib_conn->login_resp_dma; 590 rx_buflen = ISER_RX_LOGIN_SIZE; 591 } else { 592 rx_dma = rx_desc->dma_addr; 593 rx_buflen = ISER_RX_PAYLOAD_SIZE; 594 } 595 596 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma, 597 rx_buflen, DMA_FROM_DEVICE); 598 599 hdr = &rx_desc->iscsi_header; 600 601 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 602 hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN)); 603 604 iscsi_iser_recv(ib_conn->iscsi_conn, hdr, rx_desc->data, 605 rx_xfer_len - ISER_HEADERS_LEN); 606 607 ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma, 608 rx_buflen, DMA_FROM_DEVICE); 609 610 /* decrementing conn->post_recv_buf_count only --after-- freeing the * 611 * task eliminates the need to worry on tasks which are completed in * 612 * parallel to the execution of iser_conn_term. So the code that waits * 613 * for the posted rx bufs refcount to become zero handles everything */ 614 ib_conn->post_recv_buf_count--; 615 616 if (rx_dma == ib_conn->login_resp_dma) 617 return; 618 619 outstanding = ib_conn->post_recv_buf_count; 620 if (outstanding + ib_conn->min_posted_rx <= ib_conn->qp_max_recv_dtos) { 621 count = min(ib_conn->qp_max_recv_dtos - outstanding, 622 ib_conn->min_posted_rx); 623 err = iser_post_recvm(ib_conn, count); 624 if (err) 625 iser_err("posting %d rx bufs err %d\n", count, err); 626 } 627 } 628 629 void iser_snd_completion(struct iser_tx_desc *tx_desc, 630 struct iser_conn *ib_conn) 631 { 632 struct iscsi_task *task; 633 struct iser_device *device = ib_conn->device; 634 635 if (tx_desc->type == ISCSI_TX_DATAOUT) { 636 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr, 637 ISER_HEADERS_LEN, DMA_TO_DEVICE); 638 kmem_cache_free(ig.desc_cache, tx_desc); 639 tx_desc = NULL; 640 } 641 642 atomic_dec(&ib_conn->post_send_buf_count); 643 644 if (tx_desc && tx_desc->type == ISCSI_TX_CONTROL) { 645 /* this arithmetic is legal by libiscsi dd_data allocation */ 646 task = (void *) ((long)(void *)tx_desc - 647 sizeof(struct iscsi_task)); 648 if (task->hdr->itt == RESERVED_ITT) 649 iscsi_put_task(task); 650 } 651 } 652 653 void iser_task_rdma_init(struct iscsi_iser_task *iser_task) 654 655 { 656 iser_task->status = ISER_TASK_STATUS_INIT; 657 658 iser_task->dir[ISER_DIR_IN] = 0; 659 iser_task->dir[ISER_DIR_OUT] = 0; 660 661 iser_task->data[ISER_DIR_IN].data_len = 0; 662 iser_task->data[ISER_DIR_OUT].data_len = 0; 663 664 iser_task->prot[ISER_DIR_IN].data_len = 0; 665 iser_task->prot[ISER_DIR_OUT].data_len = 0; 666 667 memset(&iser_task->rdma_regd[ISER_DIR_IN], 0, 668 sizeof(struct iser_regd_buf)); 669 memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0, 670 sizeof(struct iser_regd_buf)); 671 } 672 673 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) 674 { 675 struct iser_device *device = iser_task->ib_conn->device; 676 int is_rdma_data_aligned = 1; 677 int is_rdma_prot_aligned = 1; 678 int prot_count = scsi_prot_sg_count(iser_task->sc); 679 680 /* if we were reading, copy back to unaligned sglist, 681 * anyway dma_unmap and free the copy 682 */ 683 if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) { 684 is_rdma_data_aligned = 0; 685 iser_finalize_rdma_unaligned_sg(iser_task, 686 &iser_task->data[ISER_DIR_IN], 687 &iser_task->data_copy[ISER_DIR_IN], 688 ISER_DIR_IN); 689 } 690 691 if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) { 692 is_rdma_data_aligned = 0; 693 iser_finalize_rdma_unaligned_sg(iser_task, 694 &iser_task->data[ISER_DIR_OUT], 695 &iser_task->data_copy[ISER_DIR_OUT], 696 ISER_DIR_OUT); 697 } 698 699 if (iser_task->prot_copy[ISER_DIR_IN].copy_buf != NULL) { 700 is_rdma_prot_aligned = 0; 701 iser_finalize_rdma_unaligned_sg(iser_task, 702 &iser_task->prot[ISER_DIR_IN], 703 &iser_task->prot_copy[ISER_DIR_IN], 704 ISER_DIR_IN); 705 } 706 707 if (iser_task->prot_copy[ISER_DIR_OUT].copy_buf != NULL) { 708 is_rdma_prot_aligned = 0; 709 iser_finalize_rdma_unaligned_sg(iser_task, 710 &iser_task->prot[ISER_DIR_OUT], 711 &iser_task->prot_copy[ISER_DIR_OUT], 712 ISER_DIR_OUT); 713 } 714 715 if (iser_task->dir[ISER_DIR_IN]) { 716 device->iser_unreg_rdma_mem(iser_task, ISER_DIR_IN); 717 if (is_rdma_data_aligned) 718 iser_dma_unmap_task_data(iser_task, 719 &iser_task->data[ISER_DIR_IN]); 720 if (prot_count && is_rdma_prot_aligned) 721 iser_dma_unmap_task_data(iser_task, 722 &iser_task->prot[ISER_DIR_IN]); 723 } 724 725 if (iser_task->dir[ISER_DIR_OUT]) { 726 device->iser_unreg_rdma_mem(iser_task, ISER_DIR_OUT); 727 if (is_rdma_data_aligned) 728 iser_dma_unmap_task_data(iser_task, 729 &iser_task->data[ISER_DIR_OUT]); 730 if (prot_count && is_rdma_prot_aligned) 731 iser_dma_unmap_task_data(iser_task, 732 &iser_task->prot[ISER_DIR_OUT]); 733 } 734 } 735