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_device *device = iser_task->iser_conn->ib_conn.device; 53 struct iser_mem_reg *mem_reg; 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 mem_reg = &iser_task->rdma_reg[ISER_DIR_IN]; 82 83 hdr->flags |= ISER_RSV; 84 hdr->read_stag = cpu_to_be32(mem_reg->rkey); 85 hdr->read_va = cpu_to_be64(mem_reg->sge.addr); 86 87 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n", 88 task->itt, mem_reg->rkey, 89 (unsigned long long)mem_reg->sge.addr); 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 */ 99static int 100iser_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_mem_reg *mem_reg; 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 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT]; 138 139 if (unsol_sz < edtl) { 140 hdr->flags |= ISER_WSV; 141 hdr->write_stag = cpu_to_be32(mem_reg->rkey); 142 hdr->write_va = cpu_to_be64(mem_reg->sge.addr + unsol_sz); 143 144 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X " 145 "VA:%#llX + unsol:%d\n", 146 task->itt, mem_reg->rkey, 147 (unsigned long long)mem_reg->sge.addr, 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 = mem_reg->sge.addr; 154 tx_dsg->length = imm_sz; 155 tx_dsg->lkey = mem_reg->sge.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 */ 163static 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 182static 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 207static 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 247free_login_buf: 248 iser_free_login_buf(iser_conn); 249 250out_err: 251 iser_err("unable to alloc or map login buf\n"); 252 return -ENOMEM; 253} 254 255int 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 300rx_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; 307rx_desc_alloc_fail: 308 iser_free_login_buf(iser_conn); 309alloc_login_buf_fail: 310 device->iser_free_rdma_reg_res(ib_conn); 311create_rdma_reg_res_failed: 312 iser_err("failed allocating rx descriptors / data buffers\n"); 313 return -ENOMEM; 314} 315 316void 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 (device->iser_free_rdma_reg_res) 324 device->iser_free_rdma_reg_res(ib_conn); 325 326 rx_desc = iser_conn->rx_descs; 327 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) 328 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 329 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 330 kfree(iser_conn->rx_descs); 331 /* make sure we never redo any unmapping */ 332 iser_conn->rx_descs = NULL; 333 334 iser_free_login_buf(iser_conn); 335} 336 337static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req) 338{ 339 struct iser_conn *iser_conn = conn->dd_data; 340 struct ib_conn *ib_conn = &iser_conn->ib_conn; 341 struct iscsi_session *session = conn->session; 342 343 iser_dbg("req op %x flags %x\n", req->opcode, req->flags); 344 /* check if this is the last login - going to full feature phase */ 345 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE) 346 return 0; 347 348 /* 349 * Check that there is one posted recv buffer 350 * (for the last login response). 351 */ 352 WARN_ON(ib_conn->post_recv_buf_count != 1); 353 354 if (session->discovery_sess) { 355 iser_info("Discovery session, re-using login RX buffer\n"); 356 return 0; 357 } else 358 iser_info("Normal session, posting batch of RX %d buffers\n", 359 iser_conn->min_posted_rx); 360 361 /* Initial post receive buffers */ 362 if (iser_post_recvm(iser_conn, iser_conn->min_posted_rx)) 363 return -ENOMEM; 364 365 return 0; 366} 367 368static inline bool iser_signal_comp(u8 sig_count) 369{ 370 return ((sig_count % ISER_SIGNAL_CMD_COUNT) == 0); 371} 372 373/** 374 * iser_send_command - send command PDU 375 */ 376int iser_send_command(struct iscsi_conn *conn, 377 struct iscsi_task *task) 378{ 379 struct iser_conn *iser_conn = conn->dd_data; 380 struct iscsi_iser_task *iser_task = task->dd_data; 381 unsigned long edtl; 382 int err; 383 struct iser_data_buf *data_buf, *prot_buf; 384 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr; 385 struct scsi_cmnd *sc = task->sc; 386 struct iser_tx_desc *tx_desc = &iser_task->desc; 387 u8 sig_count = ++iser_conn->ib_conn.sig_count; 388 389 edtl = ntohl(hdr->data_length); 390 391 /* build the tx desc regd header and add it to the tx desc dto */ 392 tx_desc->type = ISCSI_TX_SCSI_COMMAND; 393 iser_create_send_desc(iser_conn, tx_desc); 394 395 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 396 data_buf = &iser_task->data[ISER_DIR_IN]; 397 prot_buf = &iser_task->prot[ISER_DIR_IN]; 398 } else { 399 data_buf = &iser_task->data[ISER_DIR_OUT]; 400 prot_buf = &iser_task->prot[ISER_DIR_OUT]; 401 } 402 403 if (scsi_sg_count(sc)) { /* using a scatter list */ 404 data_buf->sg = scsi_sglist(sc); 405 data_buf->size = scsi_sg_count(sc); 406 } 407 data_buf->data_len = scsi_bufflen(sc); 408 409 if (scsi_prot_sg_count(sc)) { 410 prot_buf->sg = scsi_prot_sglist(sc); 411 prot_buf->size = scsi_prot_sg_count(sc); 412 prot_buf->data_len = (data_buf->data_len >> 413 ilog2(sc->device->sector_size)) * 8; 414 } 415 416 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 417 err = iser_prepare_read_cmd(task); 418 if (err) 419 goto send_command_error; 420 } 421 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { 422 err = iser_prepare_write_cmd(task, 423 task->imm_count, 424 task->imm_count + 425 task->unsol_r2t.data_length, 426 edtl); 427 if (err) 428 goto send_command_error; 429 } 430 431 iser_task->status = ISER_TASK_STATUS_STARTED; 432 433 err = iser_post_send(&iser_conn->ib_conn, tx_desc, 434 iser_signal_comp(sig_count)); 435 if (!err) 436 return 0; 437 438send_command_error: 439 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); 440 return err; 441} 442 443/** 444 * iser_send_data_out - send data out PDU 445 */ 446int iser_send_data_out(struct iscsi_conn *conn, 447 struct iscsi_task *task, 448 struct iscsi_data *hdr) 449{ 450 struct iser_conn *iser_conn = conn->dd_data; 451 struct iscsi_iser_task *iser_task = task->dd_data; 452 struct iser_tx_desc *tx_desc = NULL; 453 struct iser_mem_reg *mem_reg; 454 unsigned long buf_offset; 455 unsigned long data_seg_len; 456 uint32_t itt; 457 int err; 458 struct ib_sge *tx_dsg; 459 460 itt = (__force uint32_t)hdr->itt; 461 data_seg_len = ntoh24(hdr->dlength); 462 buf_offset = ntohl(hdr->offset); 463 464 iser_dbg("%s itt %d dseg_len %d offset %d\n", 465 __func__,(int)itt,(int)data_seg_len,(int)buf_offset); 466 467 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); 468 if (tx_desc == NULL) { 469 iser_err("Failed to alloc desc for post dataout\n"); 470 return -ENOMEM; 471 } 472 473 tx_desc->type = ISCSI_TX_DATAOUT; 474 tx_desc->iser_header.flags = ISER_VER; 475 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); 476 477 /* build the tx desc */ 478 err = iser_initialize_task_headers(task, tx_desc); 479 if (err) 480 goto send_data_out_error; 481 482 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT]; 483 tx_dsg = &tx_desc->tx_sg[1]; 484 tx_dsg->addr = mem_reg->sge.addr + buf_offset; 485 tx_dsg->length = data_seg_len; 486 tx_dsg->lkey = mem_reg->sge.lkey; 487 tx_desc->num_sge = 2; 488 489 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { 490 iser_err("Offset:%ld & DSL:%ld in Data-Out " 491 "inconsistent with total len:%ld, itt:%d\n", 492 buf_offset, data_seg_len, 493 iser_task->data[ISER_DIR_OUT].data_len, itt); 494 err = -EINVAL; 495 goto send_data_out_error; 496 } 497 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", 498 itt, buf_offset, data_seg_len); 499 500 501 err = iser_post_send(&iser_conn->ib_conn, tx_desc, true); 502 if (!err) 503 return 0; 504 505send_data_out_error: 506 kmem_cache_free(ig.desc_cache, tx_desc); 507 iser_err("conn %p failed err %d\n", conn, err); 508 return err; 509} 510 511int iser_send_control(struct iscsi_conn *conn, 512 struct iscsi_task *task) 513{ 514 struct iser_conn *iser_conn = conn->dd_data; 515 struct iscsi_iser_task *iser_task = task->dd_data; 516 struct iser_tx_desc *mdesc = &iser_task->desc; 517 unsigned long data_seg_len; 518 int err = 0; 519 struct iser_device *device; 520 521 /* build the tx desc regd header and add it to the tx desc dto */ 522 mdesc->type = ISCSI_TX_CONTROL; 523 iser_create_send_desc(iser_conn, mdesc); 524 525 device = iser_conn->ib_conn.device; 526 527 data_seg_len = ntoh24(task->hdr->dlength); 528 529 if (data_seg_len > 0) { 530 struct ib_sge *tx_dsg = &mdesc->tx_sg[1]; 531 if (task != conn->login_task) { 532 iser_err("data present on non login task!!!\n"); 533 goto send_control_error; 534 } 535 536 ib_dma_sync_single_for_cpu(device->ib_device, 537 iser_conn->login_req_dma, task->data_count, 538 DMA_TO_DEVICE); 539 540 memcpy(iser_conn->login_req_buf, task->data, task->data_count); 541 542 ib_dma_sync_single_for_device(device->ib_device, 543 iser_conn->login_req_dma, task->data_count, 544 DMA_TO_DEVICE); 545 546 tx_dsg->addr = iser_conn->login_req_dma; 547 tx_dsg->length = task->data_count; 548 tx_dsg->lkey = device->mr->lkey; 549 mdesc->num_sge = 2; 550 } 551 552 if (task == conn->login_task) { 553 iser_dbg("op %x dsl %lx, posting login rx buffer\n", 554 task->hdr->opcode, data_seg_len); 555 err = iser_post_recvl(iser_conn); 556 if (err) 557 goto send_control_error; 558 err = iser_post_rx_bufs(conn, task->hdr); 559 if (err) 560 goto send_control_error; 561 } 562 563 err = iser_post_send(&iser_conn->ib_conn, mdesc, true); 564 if (!err) 565 return 0; 566 567send_control_error: 568 iser_err("conn %p failed err %d\n",conn, err); 569 return err; 570} 571 572/** 573 * iser_rcv_dto_completion - recv DTO completion 574 */ 575void iser_rcv_completion(struct iser_rx_desc *rx_desc, 576 unsigned long rx_xfer_len, 577 struct ib_conn *ib_conn) 578{ 579 struct iser_conn *iser_conn = container_of(ib_conn, struct iser_conn, 580 ib_conn); 581 struct iscsi_hdr *hdr; 582 u64 rx_dma; 583 int rx_buflen, outstanding, count, err; 584 585 /* differentiate between login to all other PDUs */ 586 if ((char *)rx_desc == iser_conn->login_resp_buf) { 587 rx_dma = iser_conn->login_resp_dma; 588 rx_buflen = ISER_RX_LOGIN_SIZE; 589 } else { 590 rx_dma = rx_desc->dma_addr; 591 rx_buflen = ISER_RX_PAYLOAD_SIZE; 592 } 593 594 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma, 595 rx_buflen, DMA_FROM_DEVICE); 596 597 hdr = &rx_desc->iscsi_header; 598 599 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 600 hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN)); 601 602 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, rx_desc->data, 603 rx_xfer_len - ISER_HEADERS_LEN); 604 605 ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma, 606 rx_buflen, DMA_FROM_DEVICE); 607 608 /* decrementing conn->post_recv_buf_count only --after-- freeing the * 609 * task eliminates the need to worry on tasks which are completed in * 610 * parallel to the execution of iser_conn_term. So the code that waits * 611 * for the posted rx bufs refcount to become zero handles everything */ 612 ib_conn->post_recv_buf_count--; 613 614 if (rx_dma == iser_conn->login_resp_dma) 615 return; 616 617 outstanding = ib_conn->post_recv_buf_count; 618 if (outstanding + iser_conn->min_posted_rx <= iser_conn->qp_max_recv_dtos) { 619 count = min(iser_conn->qp_max_recv_dtos - outstanding, 620 iser_conn->min_posted_rx); 621 err = iser_post_recvm(iser_conn, count); 622 if (err) 623 iser_err("posting %d rx bufs err %d\n", count, err); 624 } 625} 626 627void iser_snd_completion(struct iser_tx_desc *tx_desc, 628 struct ib_conn *ib_conn) 629{ 630 struct iscsi_task *task; 631 struct iser_device *device = ib_conn->device; 632 633 if (tx_desc->type == ISCSI_TX_DATAOUT) { 634 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr, 635 ISER_HEADERS_LEN, DMA_TO_DEVICE); 636 kmem_cache_free(ig.desc_cache, tx_desc); 637 tx_desc = NULL; 638 } 639 640 if (tx_desc && tx_desc->type == ISCSI_TX_CONTROL) { 641 /* this arithmetic is legal by libiscsi dd_data allocation */ 642 task = (void *) ((long)(void *)tx_desc - 643 sizeof(struct iscsi_task)); 644 if (task->hdr->itt == RESERVED_ITT) 645 iscsi_put_task(task); 646 } 647} 648 649void iser_task_rdma_init(struct iscsi_iser_task *iser_task) 650 651{ 652 iser_task->status = ISER_TASK_STATUS_INIT; 653 654 iser_task->dir[ISER_DIR_IN] = 0; 655 iser_task->dir[ISER_DIR_OUT] = 0; 656 657 iser_task->data[ISER_DIR_IN].data_len = 0; 658 iser_task->data[ISER_DIR_OUT].data_len = 0; 659 660 iser_task->prot[ISER_DIR_IN].data_len = 0; 661 iser_task->prot[ISER_DIR_OUT].data_len = 0; 662 663 memset(&iser_task->rdma_reg[ISER_DIR_IN], 0, 664 sizeof(struct iser_mem_reg)); 665 memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0, 666 sizeof(struct iser_mem_reg)); 667} 668 669void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) 670{ 671 struct iser_device *device = iser_task->iser_conn->ib_conn.device; 672 int is_rdma_data_aligned = 1; 673 int is_rdma_prot_aligned = 1; 674 int prot_count = scsi_prot_sg_count(iser_task->sc); 675 676 /* if we were reading, copy back to unaligned sglist, 677 * anyway dma_unmap and free the copy 678 */ 679 if (iser_task->data[ISER_DIR_IN].orig_sg) { 680 is_rdma_data_aligned = 0; 681 iser_finalize_rdma_unaligned_sg(iser_task, 682 &iser_task->data[ISER_DIR_IN], 683 ISER_DIR_IN); 684 } 685 686 if (iser_task->data[ISER_DIR_OUT].orig_sg) { 687 is_rdma_data_aligned = 0; 688 iser_finalize_rdma_unaligned_sg(iser_task, 689 &iser_task->data[ISER_DIR_OUT], 690 ISER_DIR_OUT); 691 } 692 693 if (iser_task->prot[ISER_DIR_IN].orig_sg) { 694 is_rdma_prot_aligned = 0; 695 iser_finalize_rdma_unaligned_sg(iser_task, 696 &iser_task->prot[ISER_DIR_IN], 697 ISER_DIR_IN); 698 } 699 700 if (iser_task->prot[ISER_DIR_OUT].orig_sg) { 701 is_rdma_prot_aligned = 0; 702 iser_finalize_rdma_unaligned_sg(iser_task, 703 &iser_task->prot[ISER_DIR_OUT], 704 ISER_DIR_OUT); 705 } 706 707 if (iser_task->dir[ISER_DIR_IN]) { 708 device->iser_unreg_rdma_mem(iser_task, ISER_DIR_IN); 709 if (is_rdma_data_aligned) 710 iser_dma_unmap_task_data(iser_task, 711 &iser_task->data[ISER_DIR_IN], 712 DMA_FROM_DEVICE); 713 if (prot_count && is_rdma_prot_aligned) 714 iser_dma_unmap_task_data(iser_task, 715 &iser_task->prot[ISER_DIR_IN], 716 DMA_FROM_DEVICE); 717 } 718 719 if (iser_task->dir[ISER_DIR_OUT]) { 720 device->iser_unreg_rdma_mem(iser_task, ISER_DIR_OUT); 721 if (is_rdma_data_aligned) 722 iser_dma_unmap_task_data(iser_task, 723 &iser_task->data[ISER_DIR_OUT], 724 DMA_TO_DEVICE); 725 if (prot_count && is_rdma_prot_aligned) 726 iser_dma_unmap_task_data(iser_task, 727 &iser_task->prot[ISER_DIR_OUT], 728 DMA_TO_DEVICE); 729 } 730} 731