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->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 (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->iser_conn->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 *iser_conn, 164 struct iser_tx_desc *tx_desc) 165 { 166 struct iser_device *device = iser_conn->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 *iser_conn) 183 { 184 struct iser_device *device = iser_conn->ib_conn.device; 185 186 if (!iser_conn->login_buf) 187 return; 188 189 if (iser_conn->login_req_dma) 190 ib_dma_unmap_single(device->ib_device, 191 iser_conn->login_req_dma, 192 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 193 194 if (iser_conn->login_resp_dma) 195 ib_dma_unmap_single(device->ib_device, 196 iser_conn->login_resp_dma, 197 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 198 199 kfree(iser_conn->login_buf); 200 201 /* make sure we never redo any unmapping */ 202 iser_conn->login_req_dma = 0; 203 iser_conn->login_resp_dma = 0; 204 iser_conn->login_buf = NULL; 205 } 206 207 static int iser_alloc_login_buf(struct iser_conn *iser_conn) 208 { 209 struct iser_device *device = iser_conn->ib_conn.device; 210 int req_err, resp_err; 211 212 BUG_ON(device == NULL); 213 214 iser_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN + 215 ISER_RX_LOGIN_SIZE, GFP_KERNEL); 216 if (!iser_conn->login_buf) 217 goto out_err; 218 219 iser_conn->login_req_buf = iser_conn->login_buf; 220 iser_conn->login_resp_buf = iser_conn->login_buf + 221 ISCSI_DEF_MAX_RECV_SEG_LEN; 222 223 iser_conn->login_req_dma = ib_dma_map_single(device->ib_device, 224 iser_conn->login_req_buf, 225 ISCSI_DEF_MAX_RECV_SEG_LEN, 226 DMA_TO_DEVICE); 227 228 iser_conn->login_resp_dma = ib_dma_map_single(device->ib_device, 229 iser_conn->login_resp_buf, 230 ISER_RX_LOGIN_SIZE, 231 DMA_FROM_DEVICE); 232 233 req_err = ib_dma_mapping_error(device->ib_device, 234 iser_conn->login_req_dma); 235 resp_err = ib_dma_mapping_error(device->ib_device, 236 iser_conn->login_resp_dma); 237 238 if (req_err || resp_err) { 239 if (req_err) 240 iser_conn->login_req_dma = 0; 241 if (resp_err) 242 iser_conn->login_resp_dma = 0; 243 goto free_login_buf; 244 } 245 return 0; 246 247 free_login_buf: 248 iser_free_login_buf(iser_conn); 249 250 out_err: 251 iser_err("unable to alloc or map login buf\n"); 252 return -ENOMEM; 253 } 254 255 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, 256 struct iscsi_session *session) 257 { 258 int i, j; 259 u64 dma_addr; 260 struct iser_rx_desc *rx_desc; 261 struct ib_sge *rx_sg; 262 struct ib_conn *ib_conn = &iser_conn->ib_conn; 263 struct iser_device *device = ib_conn->device; 264 265 iser_conn->qp_max_recv_dtos = session->cmds_max; 266 iser_conn->qp_max_recv_dtos_mask = session->cmds_max - 1; /* cmds_max is 2^N */ 267 iser_conn->min_posted_rx = iser_conn->qp_max_recv_dtos >> 2; 268 269 if (device->iser_alloc_rdma_reg_res(ib_conn, session->scsi_cmds_max)) 270 goto create_rdma_reg_res_failed; 271 272 if (iser_alloc_login_buf(iser_conn)) 273 goto alloc_login_buf_fail; 274 275 iser_conn->num_rx_descs = session->cmds_max; 276 iser_conn->rx_descs = kmalloc(iser_conn->num_rx_descs * 277 sizeof(struct iser_rx_desc), GFP_KERNEL); 278 if (!iser_conn->rx_descs) 279 goto rx_desc_alloc_fail; 280 281 rx_desc = iser_conn->rx_descs; 282 283 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) { 284 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc, 285 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 286 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 287 goto rx_desc_dma_map_failed; 288 289 rx_desc->dma_addr = dma_addr; 290 291 rx_sg = &rx_desc->rx_sg; 292 rx_sg->addr = rx_desc->dma_addr; 293 rx_sg->length = ISER_RX_PAYLOAD_SIZE; 294 rx_sg->lkey = device->mr->lkey; 295 } 296 297 iser_conn->rx_desc_head = 0; 298 return 0; 299 300 rx_desc_dma_map_failed: 301 rx_desc = iser_conn->rx_descs; 302 for (j = 0; j < i; j++, rx_desc++) 303 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 304 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 305 kfree(iser_conn->rx_descs); 306 iser_conn->rx_descs = NULL; 307 rx_desc_alloc_fail: 308 iser_free_login_buf(iser_conn); 309 alloc_login_buf_fail: 310 device->iser_free_rdma_reg_res(ib_conn); 311 create_rdma_reg_res_failed: 312 iser_err("failed allocating rx descriptors / data buffers\n"); 313 return -ENOMEM; 314 } 315 316 void iser_free_rx_descriptors(struct iser_conn *iser_conn) 317 { 318 int i; 319 struct iser_rx_desc *rx_desc; 320 struct ib_conn *ib_conn = &iser_conn->ib_conn; 321 struct iser_device *device = ib_conn->device; 322 323 if (!iser_conn->rx_descs) 324 goto free_login_buf; 325 326 if (device->iser_free_rdma_reg_res) 327 device->iser_free_rdma_reg_res(ib_conn); 328 329 rx_desc = iser_conn->rx_descs; 330 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) 331 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 332 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 333 kfree(iser_conn->rx_descs); 334 /* make sure we never redo any unmapping */ 335 iser_conn->rx_descs = NULL; 336 337 free_login_buf: 338 iser_free_login_buf(iser_conn); 339 } 340 341 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req) 342 { 343 struct iser_conn *iser_conn = conn->dd_data; 344 struct ib_conn *ib_conn = &iser_conn->ib_conn; 345 struct iscsi_session *session = conn->session; 346 347 iser_dbg("req op %x flags %x\n", req->opcode, req->flags); 348 /* check if this is the last login - going to full feature phase */ 349 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE) 350 return 0; 351 352 /* 353 * Check that there is one posted recv buffer 354 * (for the last login response). 355 */ 356 WARN_ON(ib_conn->post_recv_buf_count != 1); 357 358 if (session->discovery_sess) { 359 iser_info("Discovery session, re-using login RX buffer\n"); 360 return 0; 361 } else 362 iser_info("Normal session, posting batch of RX %d buffers\n", 363 iser_conn->min_posted_rx); 364 365 /* Initial post receive buffers */ 366 if (iser_post_recvm(iser_conn, iser_conn->min_posted_rx)) 367 return -ENOMEM; 368 369 return 0; 370 } 371 372 static inline bool iser_signal_comp(int sig_count) 373 { 374 return ((sig_count % ISER_SIGNAL_CMD_COUNT) == 0); 375 } 376 377 /** 378 * iser_send_command - send command PDU 379 */ 380 int iser_send_command(struct iscsi_conn *conn, 381 struct iscsi_task *task) 382 { 383 struct iser_conn *iser_conn = conn->dd_data; 384 struct iscsi_iser_task *iser_task = task->dd_data; 385 unsigned long edtl; 386 int err; 387 struct iser_data_buf *data_buf, *prot_buf; 388 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr; 389 struct scsi_cmnd *sc = task->sc; 390 struct iser_tx_desc *tx_desc = &iser_task->desc; 391 static unsigned sig_count; 392 393 edtl = ntohl(hdr->data_length); 394 395 /* build the tx desc regd header and add it to the tx desc dto */ 396 tx_desc->type = ISCSI_TX_SCSI_COMMAND; 397 iser_create_send_desc(iser_conn, tx_desc); 398 399 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 400 data_buf = &iser_task->data[ISER_DIR_IN]; 401 prot_buf = &iser_task->prot[ISER_DIR_IN]; 402 } else { 403 data_buf = &iser_task->data[ISER_DIR_OUT]; 404 prot_buf = &iser_task->prot[ISER_DIR_OUT]; 405 } 406 407 if (scsi_sg_count(sc)) { /* using a scatter list */ 408 data_buf->buf = scsi_sglist(sc); 409 data_buf->size = scsi_sg_count(sc); 410 } 411 data_buf->data_len = scsi_bufflen(sc); 412 413 if (scsi_prot_sg_count(sc)) { 414 prot_buf->buf = scsi_prot_sglist(sc); 415 prot_buf->size = scsi_prot_sg_count(sc); 416 prot_buf->data_len = data_buf->data_len >> 417 ilog2(sc->device->sector_size) * 8; 418 } 419 420 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 421 err = iser_prepare_read_cmd(task); 422 if (err) 423 goto send_command_error; 424 } 425 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { 426 err = iser_prepare_write_cmd(task, 427 task->imm_count, 428 task->imm_count + 429 task->unsol_r2t.data_length, 430 edtl); 431 if (err) 432 goto send_command_error; 433 } 434 435 iser_task->status = ISER_TASK_STATUS_STARTED; 436 437 err = iser_post_send(&iser_conn->ib_conn, tx_desc, 438 iser_signal_comp(++sig_count)); 439 if (!err) 440 return 0; 441 442 send_command_error: 443 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); 444 return err; 445 } 446 447 /** 448 * iser_send_data_out - send data out PDU 449 */ 450 int iser_send_data_out(struct iscsi_conn *conn, 451 struct iscsi_task *task, 452 struct iscsi_data *hdr) 453 { 454 struct iser_conn *iser_conn = conn->dd_data; 455 struct iscsi_iser_task *iser_task = task->dd_data; 456 struct iser_tx_desc *tx_desc = NULL; 457 struct iser_regd_buf *regd_buf; 458 unsigned long buf_offset; 459 unsigned long data_seg_len; 460 uint32_t itt; 461 int err = 0; 462 struct ib_sge *tx_dsg; 463 464 itt = (__force uint32_t)hdr->itt; 465 data_seg_len = ntoh24(hdr->dlength); 466 buf_offset = ntohl(hdr->offset); 467 468 iser_dbg("%s itt %d dseg_len %d offset %d\n", 469 __func__,(int)itt,(int)data_seg_len,(int)buf_offset); 470 471 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); 472 if (tx_desc == NULL) { 473 iser_err("Failed to alloc desc for post dataout\n"); 474 return -ENOMEM; 475 } 476 477 tx_desc->type = ISCSI_TX_DATAOUT; 478 tx_desc->iser_header.flags = ISER_VER; 479 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); 480 481 /* build the tx desc */ 482 iser_initialize_task_headers(task, tx_desc); 483 484 regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; 485 tx_dsg = &tx_desc->tx_sg[1]; 486 tx_dsg->addr = regd_buf->reg.va + buf_offset; 487 tx_dsg->length = data_seg_len; 488 tx_dsg->lkey = regd_buf->reg.lkey; 489 tx_desc->num_sge = 2; 490 491 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { 492 iser_err("Offset:%ld & DSL:%ld in Data-Out " 493 "inconsistent with total len:%ld, itt:%d\n", 494 buf_offset, data_seg_len, 495 iser_task->data[ISER_DIR_OUT].data_len, itt); 496 err = -EINVAL; 497 goto send_data_out_error; 498 } 499 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", 500 itt, buf_offset, data_seg_len); 501 502 503 err = iser_post_send(&iser_conn->ib_conn, tx_desc, true); 504 if (!err) 505 return 0; 506 507 send_data_out_error: 508 kmem_cache_free(ig.desc_cache, tx_desc); 509 iser_err("conn %p failed err %d\n",conn, err); 510 return err; 511 } 512 513 int iser_send_control(struct iscsi_conn *conn, 514 struct iscsi_task *task) 515 { 516 struct iser_conn *iser_conn = conn->dd_data; 517 struct iscsi_iser_task *iser_task = task->dd_data; 518 struct iser_tx_desc *mdesc = &iser_task->desc; 519 unsigned long data_seg_len; 520 int err = 0; 521 struct iser_device *device; 522 523 /* build the tx desc regd header and add it to the tx desc dto */ 524 mdesc->type = ISCSI_TX_CONTROL; 525 iser_create_send_desc(iser_conn, mdesc); 526 527 device = iser_conn->ib_conn.device; 528 529 data_seg_len = ntoh24(task->hdr->dlength); 530 531 if (data_seg_len > 0) { 532 struct ib_sge *tx_dsg = &mdesc->tx_sg[1]; 533 if (task != conn->login_task) { 534 iser_err("data present on non login task!!!\n"); 535 goto send_control_error; 536 } 537 538 ib_dma_sync_single_for_cpu(device->ib_device, 539 iser_conn->login_req_dma, task->data_count, 540 DMA_TO_DEVICE); 541 542 memcpy(iser_conn->login_req_buf, task->data, task->data_count); 543 544 ib_dma_sync_single_for_device(device->ib_device, 545 iser_conn->login_req_dma, task->data_count, 546 DMA_TO_DEVICE); 547 548 tx_dsg->addr = iser_conn->login_req_dma; 549 tx_dsg->length = task->data_count; 550 tx_dsg->lkey = device->mr->lkey; 551 mdesc->num_sge = 2; 552 } 553 554 if (task == conn->login_task) { 555 iser_dbg("op %x dsl %lx, posting login rx buffer\n", 556 task->hdr->opcode, data_seg_len); 557 err = iser_post_recvl(iser_conn); 558 if (err) 559 goto send_control_error; 560 err = iser_post_rx_bufs(conn, task->hdr); 561 if (err) 562 goto send_control_error; 563 } 564 565 err = iser_post_send(&iser_conn->ib_conn, mdesc, true); 566 if (!err) 567 return 0; 568 569 send_control_error: 570 iser_err("conn %p failed err %d\n",conn, err); 571 return err; 572 } 573 574 /** 575 * iser_rcv_dto_completion - recv DTO completion 576 */ 577 void iser_rcv_completion(struct iser_rx_desc *rx_desc, 578 unsigned long rx_xfer_len, 579 struct ib_conn *ib_conn) 580 { 581 struct iser_conn *iser_conn = container_of(ib_conn, struct iser_conn, 582 ib_conn); 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 == iser_conn->login_resp_buf) { 589 rx_dma = iser_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(iser_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 == iser_conn->login_resp_dma) 617 return; 618 619 outstanding = ib_conn->post_recv_buf_count; 620 if (outstanding + iser_conn->min_posted_rx <= iser_conn->qp_max_recv_dtos) { 621 count = min(iser_conn->qp_max_recv_dtos - outstanding, 622 iser_conn->min_posted_rx); 623 err = iser_post_recvm(iser_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 ib_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 if (tx_desc && tx_desc->type == ISCSI_TX_CONTROL) { 643 /* this arithmetic is legal by libiscsi dd_data allocation */ 644 task = (void *) ((long)(void *)tx_desc - 645 sizeof(struct iscsi_task)); 646 if (task->hdr->itt == RESERVED_ITT) 647 iscsi_put_task(task); 648 } 649 } 650 651 void iser_task_rdma_init(struct iscsi_iser_task *iser_task) 652 653 { 654 iser_task->status = ISER_TASK_STATUS_INIT; 655 656 iser_task->dir[ISER_DIR_IN] = 0; 657 iser_task->dir[ISER_DIR_OUT] = 0; 658 659 iser_task->data[ISER_DIR_IN].data_len = 0; 660 iser_task->data[ISER_DIR_OUT].data_len = 0; 661 662 iser_task->prot[ISER_DIR_IN].data_len = 0; 663 iser_task->prot[ISER_DIR_OUT].data_len = 0; 664 665 memset(&iser_task->rdma_regd[ISER_DIR_IN], 0, 666 sizeof(struct iser_regd_buf)); 667 memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0, 668 sizeof(struct iser_regd_buf)); 669 } 670 671 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) 672 { 673 struct iser_device *device = iser_task->iser_conn->ib_conn.device; 674 int is_rdma_data_aligned = 1; 675 int is_rdma_prot_aligned = 1; 676 int prot_count = scsi_prot_sg_count(iser_task->sc); 677 678 /* if we were reading, copy back to unaligned sglist, 679 * anyway dma_unmap and free the copy 680 */ 681 if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) { 682 is_rdma_data_aligned = 0; 683 iser_finalize_rdma_unaligned_sg(iser_task, 684 &iser_task->data[ISER_DIR_IN], 685 &iser_task->data_copy[ISER_DIR_IN], 686 ISER_DIR_IN); 687 } 688 689 if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) { 690 is_rdma_data_aligned = 0; 691 iser_finalize_rdma_unaligned_sg(iser_task, 692 &iser_task->data[ISER_DIR_OUT], 693 &iser_task->data_copy[ISER_DIR_OUT], 694 ISER_DIR_OUT); 695 } 696 697 if (iser_task->prot_copy[ISER_DIR_IN].copy_buf != NULL) { 698 is_rdma_prot_aligned = 0; 699 iser_finalize_rdma_unaligned_sg(iser_task, 700 &iser_task->prot[ISER_DIR_IN], 701 &iser_task->prot_copy[ISER_DIR_IN], 702 ISER_DIR_IN); 703 } 704 705 if (iser_task->prot_copy[ISER_DIR_OUT].copy_buf != NULL) { 706 is_rdma_prot_aligned = 0; 707 iser_finalize_rdma_unaligned_sg(iser_task, 708 &iser_task->prot[ISER_DIR_OUT], 709 &iser_task->prot_copy[ISER_DIR_OUT], 710 ISER_DIR_OUT); 711 } 712 713 if (iser_task->dir[ISER_DIR_IN]) { 714 device->iser_unreg_rdma_mem(iser_task, ISER_DIR_IN); 715 if (is_rdma_data_aligned) 716 iser_dma_unmap_task_data(iser_task, 717 &iser_task->data[ISER_DIR_IN]); 718 if (prot_count && is_rdma_prot_aligned) 719 iser_dma_unmap_task_data(iser_task, 720 &iser_task->prot[ISER_DIR_IN]); 721 } 722 723 if (iser_task->dir[ISER_DIR_OUT]) { 724 device->iser_unreg_rdma_mem(iser_task, ISER_DIR_OUT); 725 if (is_rdma_data_aligned) 726 iser_dma_unmap_task_data(iser_task, 727 &iser_task->data[ISER_DIR_OUT]); 728 if (prot_count && is_rdma_prot_aligned) 729 iser_dma_unmap_task_data(iser_task, 730 &iser_task->prot[ISER_DIR_OUT]); 731 } 732 } 733