1 /* 2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 * 32 * $Id: iser_initiator.c 6964 2006-05-07 11:11:43Z ogerlitz $ 33 */ 34 #include <linux/kernel.h> 35 #include <linux/slab.h> 36 #include <linux/mm.h> 37 #include <linux/scatterlist.h> 38 #include <linux/kfifo.h> 39 #include <scsi/scsi_cmnd.h> 40 #include <scsi/scsi_host.h> 41 42 #include "iscsi_iser.h" 43 44 /* Constant PDU lengths calculations */ 45 #define ISER_TOTAL_HEADERS_LEN (sizeof (struct iser_hdr) + \ 46 sizeof (struct iscsi_hdr)) 47 48 /* iser_dto_add_regd_buff - increments the reference count for * 49 * the registered buffer & adds it to the DTO object */ 50 static void iser_dto_add_regd_buff(struct iser_dto *dto, 51 struct iser_regd_buf *regd_buf, 52 unsigned long use_offset, 53 unsigned long use_size) 54 { 55 int add_idx; 56 57 atomic_inc(®d_buf->ref_count); 58 59 add_idx = dto->regd_vector_len; 60 dto->regd[add_idx] = regd_buf; 61 dto->used_sz[add_idx] = use_size; 62 dto->offset[add_idx] = use_offset; 63 64 dto->regd_vector_len++; 65 } 66 67 /* Register user buffer memory and initialize passive rdma 68 * dto descriptor. Total data size is stored in 69 * iser_ctask->data[ISER_DIR_IN].data_len 70 */ 71 static int iser_prepare_read_cmd(struct iscsi_cmd_task *ctask, 72 unsigned int edtl) 73 74 { 75 struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; 76 struct iser_regd_buf *regd_buf; 77 int err; 78 struct iser_hdr *hdr = &iser_ctask->desc.iser_header; 79 struct iser_data_buf *buf_in = &iser_ctask->data[ISER_DIR_IN]; 80 81 err = iser_dma_map_task_data(iser_ctask, 82 buf_in, 83 ISER_DIR_IN, 84 DMA_FROM_DEVICE); 85 if (err) 86 return err; 87 88 if (edtl > iser_ctask->data[ISER_DIR_IN].data_len) { 89 iser_err("Total data length: %ld, less than EDTL: " 90 "%d, in READ cmd BHS itt: %d, conn: 0x%p\n", 91 iser_ctask->data[ISER_DIR_IN].data_len, edtl, 92 ctask->itt, iser_ctask->iser_conn); 93 return -EINVAL; 94 } 95 96 err = iser_reg_rdma_mem(iser_ctask,ISER_DIR_IN); 97 if (err) { 98 iser_err("Failed to set up Data-IN RDMA\n"); 99 return err; 100 } 101 regd_buf = &iser_ctask->rdma_regd[ISER_DIR_IN]; 102 103 hdr->flags |= ISER_RSV; 104 hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey); 105 hdr->read_va = cpu_to_be64(regd_buf->reg.va); 106 107 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n", 108 ctask->itt, regd_buf->reg.rkey, 109 (unsigned long long)regd_buf->reg.va); 110 111 return 0; 112 } 113 114 /* Register user buffer memory and initialize passive rdma 115 * dto descriptor. Total data size is stored in 116 * ctask->data[ISER_DIR_OUT].data_len 117 */ 118 static int 119 iser_prepare_write_cmd(struct iscsi_cmd_task *ctask, 120 unsigned int imm_sz, 121 unsigned int unsol_sz, 122 unsigned int edtl) 123 { 124 struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; 125 struct iser_regd_buf *regd_buf; 126 int err; 127 struct iser_dto *send_dto = &iser_ctask->desc.dto; 128 struct iser_hdr *hdr = &iser_ctask->desc.iser_header; 129 struct iser_data_buf *buf_out = &iser_ctask->data[ISER_DIR_OUT]; 130 131 err = iser_dma_map_task_data(iser_ctask, 132 buf_out, 133 ISER_DIR_OUT, 134 DMA_TO_DEVICE); 135 if (err) 136 return err; 137 138 if (edtl > iser_ctask->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_ctask->data[ISER_DIR_OUT].data_len, 142 edtl, ctask->itt, ctask->conn); 143 return -EINVAL; 144 } 145 146 err = iser_reg_rdma_mem(iser_ctask,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_ctask->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 ctask->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 ctask->itt, imm_sz); 168 iser_dto_add_regd_buff(send_dto, 169 regd_buf, 170 0, 171 imm_sz); 172 } 173 174 return 0; 175 } 176 177 /** 178 * iser_post_receive_control - allocates, initializes and posts receive DTO. 179 */ 180 static int iser_post_receive_control(struct iscsi_conn *conn) 181 { 182 struct iscsi_iser_conn *iser_conn = conn->dd_data; 183 struct iser_desc *rx_desc; 184 struct iser_regd_buf *regd_hdr; 185 struct iser_regd_buf *regd_data; 186 struct iser_dto *recv_dto = NULL; 187 struct iser_device *device = iser_conn->ib_conn->device; 188 int rx_data_size, err = 0; 189 190 rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO); 191 if (rx_desc == NULL) { 192 iser_err("Failed to alloc desc for post recv\n"); 193 return -ENOMEM; 194 } 195 rx_desc->type = ISCSI_RX; 196 197 /* for the login sequence we must support rx of upto 8K; login is done 198 * after conn create/bind (connect) and conn stop/bind (reconnect), 199 * what's common for both schemes is that the connection is not started 200 */ 201 if (conn->c_stage != ISCSI_CONN_STARTED) 202 rx_data_size = ISCSI_DEF_MAX_RECV_SEG_LEN; 203 else /* FIXME till user space sets conn->max_recv_dlength correctly */ 204 rx_data_size = 128; 205 206 rx_desc->data = kmalloc(rx_data_size, GFP_NOIO); 207 if (rx_desc->data == NULL) { 208 iser_err("Failed to alloc data buf for post recv\n"); 209 err = -ENOMEM; 210 goto post_rx_kmalloc_failure; 211 } 212 213 recv_dto = &rx_desc->dto; 214 recv_dto->ib_conn = iser_conn->ib_conn; 215 recv_dto->regd_vector_len = 0; 216 217 regd_hdr = &rx_desc->hdr_regd_buf; 218 memset(regd_hdr, 0, sizeof(struct iser_regd_buf)); 219 regd_hdr->device = device; 220 regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */ 221 regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN; 222 223 iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE); 224 225 iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0); 226 227 regd_data = &rx_desc->data_regd_buf; 228 memset(regd_data, 0, sizeof(struct iser_regd_buf)); 229 regd_data->device = device; 230 regd_data->virt_addr = rx_desc->data; 231 regd_data->data_size = rx_data_size; 232 233 iser_reg_single(device, regd_data, DMA_FROM_DEVICE); 234 235 iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0); 236 237 err = iser_post_recv(rx_desc); 238 if (!err) 239 return 0; 240 241 /* iser_post_recv failed */ 242 iser_dto_buffs_release(recv_dto); 243 kfree(rx_desc->data); 244 post_rx_kmalloc_failure: 245 kmem_cache_free(ig.desc_cache, rx_desc); 246 return err; 247 } 248 249 /* creates a new tx descriptor and adds header regd buffer */ 250 static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn, 251 struct iser_desc *tx_desc) 252 { 253 struct iser_regd_buf *regd_hdr = &tx_desc->hdr_regd_buf; 254 struct iser_dto *send_dto = &tx_desc->dto; 255 256 memset(regd_hdr, 0, sizeof(struct iser_regd_buf)); 257 regd_hdr->device = iser_conn->ib_conn->device; 258 regd_hdr->virt_addr = tx_desc; /* == &tx_desc->iser_header */ 259 regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN; 260 261 send_dto->ib_conn = iser_conn->ib_conn; 262 send_dto->notify_enable = 1; 263 send_dto->regd_vector_len = 0; 264 265 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); 266 tx_desc->iser_header.flags = ISER_VER; 267 268 iser_dto_add_regd_buff(send_dto, regd_hdr, 0, 0); 269 } 270 271 /** 272 * iser_conn_set_full_featured_mode - (iSER API) 273 */ 274 int iser_conn_set_full_featured_mode(struct iscsi_conn *conn) 275 { 276 struct iscsi_iser_conn *iser_conn = conn->dd_data; 277 278 int i; 279 /* no need to keep it in a var, we are after login so if this should 280 * be negotiated, by now the result should be available here */ 281 int initial_post_recv_bufs_num = ISER_MAX_RX_MISC_PDUS; 282 283 iser_dbg("Initially post: %d\n", initial_post_recv_bufs_num); 284 285 /* Check that there is no posted recv or send buffers left - */ 286 /* they must be consumed during the login phase */ 287 BUG_ON(atomic_read(&iser_conn->ib_conn->post_recv_buf_count) != 0); 288 BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0); 289 290 /* Initial post receive buffers */ 291 for (i = 0; i < initial_post_recv_bufs_num; i++) { 292 if (iser_post_receive_control(conn) != 0) { 293 iser_err("Failed to post recv bufs at:%d conn:0x%p\n", 294 i, conn); 295 return -ENOMEM; 296 } 297 } 298 iser_dbg("Posted %d post recv bufs, conn:0x%p\n", i, conn); 299 return 0; 300 } 301 302 static int 303 iser_check_xmit(struct iscsi_conn *conn, void *task) 304 { 305 struct iscsi_iser_conn *iser_conn = conn->dd_data; 306 307 if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) == 308 ISER_QP_MAX_REQ_DTOS) { 309 iser_dbg("%ld can't xmit task %p\n",jiffies,task); 310 return -ENOBUFS; 311 } 312 return 0; 313 } 314 315 316 /** 317 * iser_send_command - send command PDU 318 */ 319 int iser_send_command(struct iscsi_conn *conn, 320 struct iscsi_cmd_task *ctask) 321 { 322 struct iscsi_iser_conn *iser_conn = conn->dd_data; 323 struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; 324 struct iser_dto *send_dto = NULL; 325 unsigned long edtl; 326 int err = 0; 327 struct iser_data_buf *data_buf; 328 329 struct iscsi_cmd *hdr = ctask->hdr; 330 struct scsi_cmnd *sc = ctask->sc; 331 332 if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { 333 iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); 334 return -EPERM; 335 } 336 if (iser_check_xmit(conn, ctask)) 337 return -ENOBUFS; 338 339 edtl = ntohl(hdr->data_length); 340 341 /* build the tx desc regd header and add it to the tx desc dto */ 342 iser_ctask->desc.type = ISCSI_TX_SCSI_COMMAND; 343 send_dto = &iser_ctask->desc.dto; 344 send_dto->ctask = iser_ctask; 345 iser_create_send_desc(iser_conn, &iser_ctask->desc); 346 347 if (hdr->flags & ISCSI_FLAG_CMD_READ) 348 data_buf = &iser_ctask->data[ISER_DIR_IN]; 349 else 350 data_buf = &iser_ctask->data[ISER_DIR_OUT]; 351 352 if (scsi_sg_count(sc)) { /* using a scatter list */ 353 data_buf->buf = scsi_sglist(sc); 354 data_buf->size = scsi_sg_count(sc); 355 } 356 357 data_buf->data_len = scsi_bufflen(sc); 358 359 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 360 err = iser_prepare_read_cmd(ctask, edtl); 361 if (err) 362 goto send_command_error; 363 } 364 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { 365 err = iser_prepare_write_cmd(ctask, 366 ctask->imm_count, 367 ctask->imm_count + 368 ctask->unsol_count, 369 edtl); 370 if (err) 371 goto send_command_error; 372 } 373 374 iser_reg_single(iser_conn->ib_conn->device, 375 send_dto->regd[0], DMA_TO_DEVICE); 376 377 if (iser_post_receive_control(conn) != 0) { 378 iser_err("post_recv failed!\n"); 379 err = -ENOMEM; 380 goto send_command_error; 381 } 382 383 iser_ctask->status = ISER_TASK_STATUS_STARTED; 384 385 err = iser_post_send(&iser_ctask->desc); 386 if (!err) 387 return 0; 388 389 send_command_error: 390 iser_dto_buffs_release(send_dto); 391 iser_err("conn %p failed ctask->itt %d err %d\n",conn, ctask->itt, err); 392 return err; 393 } 394 395 /** 396 * iser_send_data_out - send data out PDU 397 */ 398 int iser_send_data_out(struct iscsi_conn *conn, 399 struct iscsi_cmd_task *ctask, 400 struct iscsi_data *hdr) 401 { 402 struct iscsi_iser_conn *iser_conn = conn->dd_data; 403 struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; 404 struct iser_desc *tx_desc = NULL; 405 struct iser_dto *send_dto = NULL; 406 unsigned long buf_offset; 407 unsigned long data_seg_len; 408 uint32_t itt; 409 int err = 0; 410 411 if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { 412 iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); 413 return -EPERM; 414 } 415 416 if (iser_check_xmit(conn, ctask)) 417 return -ENOBUFS; 418 419 itt = (__force uint32_t)hdr->itt; 420 data_seg_len = ntoh24(hdr->dlength); 421 buf_offset = ntohl(hdr->offset); 422 423 iser_dbg("%s itt %d dseg_len %d offset %d\n", 424 __func__,(int)itt,(int)data_seg_len,(int)buf_offset); 425 426 tx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO); 427 if (tx_desc == NULL) { 428 iser_err("Failed to alloc desc for post dataout\n"); 429 return -ENOMEM; 430 } 431 432 tx_desc->type = ISCSI_TX_DATAOUT; 433 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); 434 435 /* build the tx desc regd header and add it to the tx desc dto */ 436 send_dto = &tx_desc->dto; 437 send_dto->ctask = iser_ctask; 438 iser_create_send_desc(iser_conn, tx_desc); 439 440 iser_reg_single(iser_conn->ib_conn->device, 441 send_dto->regd[0], DMA_TO_DEVICE); 442 443 /* all data was registered for RDMA, we can use the lkey */ 444 iser_dto_add_regd_buff(send_dto, 445 &iser_ctask->rdma_regd[ISER_DIR_OUT], 446 buf_offset, 447 data_seg_len); 448 449 if (buf_offset + data_seg_len > iser_ctask->data[ISER_DIR_OUT].data_len) { 450 iser_err("Offset:%ld & DSL:%ld in Data-Out " 451 "inconsistent with total len:%ld, itt:%d\n", 452 buf_offset, data_seg_len, 453 iser_ctask->data[ISER_DIR_OUT].data_len, itt); 454 err = -EINVAL; 455 goto send_data_out_error; 456 } 457 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", 458 itt, buf_offset, data_seg_len); 459 460 461 err = iser_post_send(tx_desc); 462 if (!err) 463 return 0; 464 465 send_data_out_error: 466 iser_dto_buffs_release(send_dto); 467 kmem_cache_free(ig.desc_cache, tx_desc); 468 iser_err("conn %p failed err %d\n",conn, err); 469 return err; 470 } 471 472 int iser_send_control(struct iscsi_conn *conn, 473 struct iscsi_mgmt_task *mtask) 474 { 475 struct iscsi_iser_conn *iser_conn = conn->dd_data; 476 struct iser_desc *mdesc = mtask->dd_data; 477 struct iser_dto *send_dto = NULL; 478 unsigned long data_seg_len; 479 int err = 0; 480 struct iser_regd_buf *regd_buf; 481 struct iser_device *device; 482 483 if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { 484 iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); 485 return -EPERM; 486 } 487 488 if (iser_check_xmit(conn,mtask)) 489 return -ENOBUFS; 490 491 /* build the tx desc regd header and add it to the tx desc dto */ 492 mdesc->type = ISCSI_TX_CONTROL; 493 send_dto = &mdesc->dto; 494 send_dto->ctask = NULL; 495 iser_create_send_desc(iser_conn, mdesc); 496 497 device = iser_conn->ib_conn->device; 498 499 iser_reg_single(device, send_dto->regd[0], DMA_TO_DEVICE); 500 501 data_seg_len = ntoh24(mtask->hdr->dlength); 502 503 if (data_seg_len > 0) { 504 regd_buf = &mdesc->data_regd_buf; 505 memset(regd_buf, 0, sizeof(struct iser_regd_buf)); 506 regd_buf->device = device; 507 regd_buf->virt_addr = mtask->data; 508 regd_buf->data_size = mtask->data_count; 509 iser_reg_single(device, regd_buf, 510 DMA_TO_DEVICE); 511 iser_dto_add_regd_buff(send_dto, regd_buf, 512 0, 513 data_seg_len); 514 } 515 516 if (iser_post_receive_control(conn) != 0) { 517 iser_err("post_rcv_buff failed!\n"); 518 err = -ENOMEM; 519 goto send_control_error; 520 } 521 522 err = iser_post_send(mdesc); 523 if (!err) 524 return 0; 525 526 send_control_error: 527 iser_dto_buffs_release(send_dto); 528 iser_err("conn %p failed err %d\n",conn, err); 529 return err; 530 } 531 532 /** 533 * iser_rcv_dto_completion - recv DTO completion 534 */ 535 void iser_rcv_completion(struct iser_desc *rx_desc, 536 unsigned long dto_xfer_len) 537 { 538 struct iser_dto *dto = &rx_desc->dto; 539 struct iscsi_iser_conn *conn = dto->ib_conn->iser_conn; 540 struct iscsi_session *session = conn->iscsi_conn->session; 541 struct iscsi_cmd_task *ctask; 542 struct iscsi_iser_cmd_task *iser_ctask; 543 struct iscsi_hdr *hdr; 544 char *rx_data = NULL; 545 int rx_data_len = 0; 546 unsigned int itt; 547 unsigned char opcode; 548 549 hdr = &rx_desc->iscsi_header; 550 551 iser_dbg("op 0x%x itt 0x%x\n", hdr->opcode,hdr->itt); 552 553 if (dto_xfer_len > ISER_TOTAL_HEADERS_LEN) { /* we have data */ 554 rx_data_len = dto_xfer_len - ISER_TOTAL_HEADERS_LEN; 555 rx_data = dto->regd[1]->virt_addr; 556 rx_data += dto->offset[1]; 557 } 558 559 opcode = hdr->opcode & ISCSI_OPCODE_MASK; 560 561 if (opcode == ISCSI_OP_SCSI_CMD_RSP) { 562 itt = get_itt(hdr->itt); /* mask out cid and age bits */ 563 if (!(itt < session->cmds_max)) 564 iser_err("itt can't be matched to task!!! " 565 "conn %p opcode %d cmds_max %d itt %d\n", 566 conn->iscsi_conn,opcode,session->cmds_max,itt); 567 /* use the mapping given with the cmds array indexed by itt */ 568 ctask = (struct iscsi_cmd_task *)session->cmds[itt]; 569 iser_ctask = ctask->dd_data; 570 iser_dbg("itt %d ctask %p\n",itt,ctask); 571 iser_ctask->status = ISER_TASK_STATUS_COMPLETED; 572 iser_ctask_rdma_finalize(iser_ctask); 573 } 574 575 iser_dto_buffs_release(dto); 576 577 iscsi_iser_recv(conn->iscsi_conn, hdr, rx_data, rx_data_len); 578 579 kfree(rx_desc->data); 580 kmem_cache_free(ig.desc_cache, rx_desc); 581 582 /* decrementing conn->post_recv_buf_count only --after-- freeing the * 583 * task eliminates the need to worry on tasks which are completed in * 584 * parallel to the execution of iser_conn_term. So the code that waits * 585 * for the posted rx bufs refcount to become zero handles everything */ 586 atomic_dec(&conn->ib_conn->post_recv_buf_count); 587 } 588 589 void iser_snd_completion(struct iser_desc *tx_desc) 590 { 591 struct iser_dto *dto = &tx_desc->dto; 592 struct iser_conn *ib_conn = dto->ib_conn; 593 struct iscsi_iser_conn *iser_conn = ib_conn->iser_conn; 594 struct iscsi_conn *conn = iser_conn->iscsi_conn; 595 struct iscsi_mgmt_task *mtask; 596 int resume_tx = 0; 597 598 iser_dbg("Initiator, Data sent dto=0x%p\n", dto); 599 600 iser_dto_buffs_release(dto); 601 602 if (tx_desc->type == ISCSI_TX_DATAOUT) 603 kmem_cache_free(ig.desc_cache, tx_desc); 604 605 if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) == 606 ISER_QP_MAX_REQ_DTOS) 607 resume_tx = 1; 608 609 atomic_dec(&ib_conn->post_send_buf_count); 610 611 if (resume_tx) { 612 iser_dbg("%ld resuming tx\n",jiffies); 613 scsi_queue_work(conn->session->host, &conn->xmitwork); 614 } 615 616 if (tx_desc->type == ISCSI_TX_CONTROL) { 617 /* this arithmetic is legal by libiscsi dd_data allocation */ 618 mtask = (void *) ((long)(void *)tx_desc - 619 sizeof(struct iscsi_mgmt_task)); 620 if (mtask->hdr->itt == RESERVED_ITT) { 621 struct iscsi_session *session = conn->session; 622 623 spin_lock(&conn->session->lock); 624 iscsi_free_mgmt_task(conn, mtask); 625 spin_unlock(&session->lock); 626 } 627 } 628 } 629 630 void iser_ctask_rdma_init(struct iscsi_iser_cmd_task *iser_ctask) 631 632 { 633 iser_ctask->status = ISER_TASK_STATUS_INIT; 634 635 iser_ctask->dir[ISER_DIR_IN] = 0; 636 iser_ctask->dir[ISER_DIR_OUT] = 0; 637 638 iser_ctask->data[ISER_DIR_IN].data_len = 0; 639 iser_ctask->data[ISER_DIR_OUT].data_len = 0; 640 641 memset(&iser_ctask->rdma_regd[ISER_DIR_IN], 0, 642 sizeof(struct iser_regd_buf)); 643 memset(&iser_ctask->rdma_regd[ISER_DIR_OUT], 0, 644 sizeof(struct iser_regd_buf)); 645 } 646 647 void iser_ctask_rdma_finalize(struct iscsi_iser_cmd_task *iser_ctask) 648 { 649 int deferred; 650 int is_rdma_aligned = 1; 651 struct iser_regd_buf *regd; 652 653 /* if we were reading, copy back to unaligned sglist, 654 * anyway dma_unmap and free the copy 655 */ 656 if (iser_ctask->data_copy[ISER_DIR_IN].copy_buf != NULL) { 657 is_rdma_aligned = 0; 658 iser_finalize_rdma_unaligned_sg(iser_ctask, ISER_DIR_IN); 659 } 660 if (iser_ctask->data_copy[ISER_DIR_OUT].copy_buf != NULL) { 661 is_rdma_aligned = 0; 662 iser_finalize_rdma_unaligned_sg(iser_ctask, ISER_DIR_OUT); 663 } 664 665 if (iser_ctask->dir[ISER_DIR_IN]) { 666 regd = &iser_ctask->rdma_regd[ISER_DIR_IN]; 667 deferred = iser_regd_buff_release(regd); 668 if (deferred) { 669 iser_err("%d references remain for BUF-IN rdma reg\n", 670 atomic_read(®d->ref_count)); 671 } 672 } 673 674 if (iser_ctask->dir[ISER_DIR_OUT]) { 675 regd = &iser_ctask->rdma_regd[ISER_DIR_OUT]; 676 deferred = iser_regd_buff_release(regd); 677 if (deferred) { 678 iser_err("%d references remain for BUF-OUT rdma reg\n", 679 atomic_read(®d->ref_count)); 680 } 681 } 682 683 /* if the data was unaligned, it was already unmapped and then copied */ 684 if (is_rdma_aligned) 685 iser_dma_unmap_task_data(iser_ctask); 686 } 687 688 void iser_dto_buffs_release(struct iser_dto *dto) 689 { 690 int i; 691 692 for (i = 0; i < dto->regd_vector_len; i++) 693 iser_regd_buff_release(dto->regd[i]); 694 } 695 696