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_mem_reg *mem_reg; 53 int err; 54 struct iser_ctrl *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, false); 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 */ 98 static int 99 iser_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_ctrl *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 buf_out->data_len == imm_sz); 131 if (err != 0) { 132 iser_err("Failed to register write cmd RDMA mem\n"); 133 return err; 134 } 135 136 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT]; 137 138 if (unsol_sz < edtl) { 139 hdr->flags |= ISER_WSV; 140 hdr->write_stag = cpu_to_be32(mem_reg->rkey); 141 hdr->write_va = cpu_to_be64(mem_reg->sge.addr + unsol_sz); 142 143 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X " 144 "VA:%#llX + unsol:%d\n", 145 task->itt, mem_reg->rkey, 146 (unsigned long long)mem_reg->sge.addr, unsol_sz); 147 } 148 149 if (imm_sz > 0) { 150 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n", 151 task->itt, imm_sz); 152 tx_dsg->addr = mem_reg->sge.addr; 153 tx_dsg->length = imm_sz; 154 tx_dsg->lkey = mem_reg->sge.lkey; 155 iser_task->desc.num_sge = 2; 156 } 157 158 return 0; 159 } 160 161 /* creates a new tx descriptor and adds header regd buffer */ 162 static void iser_create_send_desc(struct iser_conn *iser_conn, 163 struct iser_tx_desc *tx_desc) 164 { 165 struct iser_device *device = iser_conn->ib_conn.device; 166 167 ib_dma_sync_single_for_cpu(device->ib_device, 168 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 169 170 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl)); 171 tx_desc->iser_header.flags = ISER_VER; 172 tx_desc->num_sge = 1; 173 } 174 175 static void iser_free_login_buf(struct iser_conn *iser_conn) 176 { 177 struct iser_device *device = iser_conn->ib_conn.device; 178 struct iser_login_desc *desc = &iser_conn->login_desc; 179 180 if (!desc->req) 181 return; 182 183 ib_dma_unmap_single(device->ib_device, desc->req_dma, 184 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 185 186 ib_dma_unmap_single(device->ib_device, desc->rsp_dma, 187 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 188 189 kfree(desc->req); 190 kfree(desc->rsp); 191 192 /* make sure we never redo any unmapping */ 193 desc->req = NULL; 194 desc->rsp = NULL; 195 } 196 197 static int iser_alloc_login_buf(struct iser_conn *iser_conn) 198 { 199 struct iser_device *device = iser_conn->ib_conn.device; 200 struct iser_login_desc *desc = &iser_conn->login_desc; 201 202 desc->req = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL); 203 if (!desc->req) 204 return -ENOMEM; 205 206 desc->req_dma = ib_dma_map_single(device->ib_device, desc->req, 207 ISCSI_DEF_MAX_RECV_SEG_LEN, 208 DMA_TO_DEVICE); 209 if (ib_dma_mapping_error(device->ib_device, 210 desc->req_dma)) 211 goto free_req; 212 213 desc->rsp = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL); 214 if (!desc->rsp) 215 goto unmap_req; 216 217 desc->rsp_dma = ib_dma_map_single(device->ib_device, desc->rsp, 218 ISER_RX_LOGIN_SIZE, 219 DMA_FROM_DEVICE); 220 if (ib_dma_mapping_error(device->ib_device, 221 desc->rsp_dma)) 222 goto free_rsp; 223 224 return 0; 225 226 free_rsp: 227 kfree(desc->rsp); 228 unmap_req: 229 ib_dma_unmap_single(device->ib_device, desc->req_dma, 230 ISCSI_DEF_MAX_RECV_SEG_LEN, 231 DMA_TO_DEVICE); 232 free_req: 233 kfree(desc->req); 234 235 return -ENOMEM; 236 } 237 238 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, 239 struct iscsi_session *session) 240 { 241 int i, j; 242 u64 dma_addr; 243 struct iser_rx_desc *rx_desc; 244 struct ib_sge *rx_sg; 245 struct ib_conn *ib_conn = &iser_conn->ib_conn; 246 struct iser_device *device = ib_conn->device; 247 248 iser_conn->qp_max_recv_dtos = session->cmds_max; 249 iser_conn->qp_max_recv_dtos_mask = session->cmds_max - 1; /* cmds_max is 2^N */ 250 iser_conn->min_posted_rx = iser_conn->qp_max_recv_dtos >> 2; 251 252 if (device->reg_ops->alloc_reg_res(ib_conn, session->scsi_cmds_max, 253 iser_conn->scsi_sg_tablesize)) 254 goto create_rdma_reg_res_failed; 255 256 if (iser_alloc_login_buf(iser_conn)) 257 goto alloc_login_buf_fail; 258 259 iser_conn->num_rx_descs = session->cmds_max; 260 iser_conn->rx_descs = kmalloc(iser_conn->num_rx_descs * 261 sizeof(struct iser_rx_desc), GFP_KERNEL); 262 if (!iser_conn->rx_descs) 263 goto rx_desc_alloc_fail; 264 265 rx_desc = iser_conn->rx_descs; 266 267 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) { 268 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc, 269 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 270 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 271 goto rx_desc_dma_map_failed; 272 273 rx_desc->dma_addr = dma_addr; 274 rx_desc->cqe.done = iser_task_rsp; 275 rx_sg = &rx_desc->rx_sg; 276 rx_sg->addr = rx_desc->dma_addr; 277 rx_sg->length = ISER_RX_PAYLOAD_SIZE; 278 rx_sg->lkey = device->pd->local_dma_lkey; 279 } 280 281 iser_conn->rx_desc_head = 0; 282 return 0; 283 284 rx_desc_dma_map_failed: 285 rx_desc = iser_conn->rx_descs; 286 for (j = 0; j < i; j++, rx_desc++) 287 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 288 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 289 kfree(iser_conn->rx_descs); 290 iser_conn->rx_descs = NULL; 291 rx_desc_alloc_fail: 292 iser_free_login_buf(iser_conn); 293 alloc_login_buf_fail: 294 device->reg_ops->free_reg_res(ib_conn); 295 create_rdma_reg_res_failed: 296 iser_err("failed allocating rx descriptors / data buffers\n"); 297 return -ENOMEM; 298 } 299 300 void iser_free_rx_descriptors(struct iser_conn *iser_conn) 301 { 302 int i; 303 struct iser_rx_desc *rx_desc; 304 struct ib_conn *ib_conn = &iser_conn->ib_conn; 305 struct iser_device *device = ib_conn->device; 306 307 if (device->reg_ops->free_reg_res) 308 device->reg_ops->free_reg_res(ib_conn); 309 310 rx_desc = iser_conn->rx_descs; 311 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) 312 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 313 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 314 kfree(iser_conn->rx_descs); 315 /* make sure we never redo any unmapping */ 316 iser_conn->rx_descs = NULL; 317 318 iser_free_login_buf(iser_conn); 319 } 320 321 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req) 322 { 323 struct iser_conn *iser_conn = conn->dd_data; 324 struct ib_conn *ib_conn = &iser_conn->ib_conn; 325 struct iscsi_session *session = conn->session; 326 327 iser_dbg("req op %x flags %x\n", req->opcode, req->flags); 328 /* check if this is the last login - going to full feature phase */ 329 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE) 330 return 0; 331 332 /* 333 * Check that there is one posted recv buffer 334 * (for the last login response). 335 */ 336 WARN_ON(ib_conn->post_recv_buf_count != 1); 337 338 if (session->discovery_sess) { 339 iser_info("Discovery session, re-using login RX buffer\n"); 340 return 0; 341 } else 342 iser_info("Normal session, posting batch of RX %d buffers\n", 343 iser_conn->min_posted_rx); 344 345 /* Initial post receive buffers */ 346 if (iser_post_recvm(iser_conn, iser_conn->min_posted_rx)) 347 return -ENOMEM; 348 349 return 0; 350 } 351 352 static inline bool iser_signal_comp(u8 sig_count) 353 { 354 return ((sig_count % ISER_SIGNAL_CMD_COUNT) == 0); 355 } 356 357 /** 358 * iser_send_command - send command PDU 359 */ 360 int iser_send_command(struct iscsi_conn *conn, 361 struct iscsi_task *task) 362 { 363 struct iser_conn *iser_conn = conn->dd_data; 364 struct iscsi_iser_task *iser_task = task->dd_data; 365 unsigned long edtl; 366 int err; 367 struct iser_data_buf *data_buf, *prot_buf; 368 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr; 369 struct scsi_cmnd *sc = task->sc; 370 struct iser_tx_desc *tx_desc = &iser_task->desc; 371 u8 sig_count = ++iser_conn->ib_conn.sig_count; 372 373 edtl = ntohl(hdr->data_length); 374 375 /* build the tx desc regd header and add it to the tx desc dto */ 376 tx_desc->type = ISCSI_TX_SCSI_COMMAND; 377 tx_desc->cqe.done = iser_cmd_comp; 378 iser_create_send_desc(iser_conn, tx_desc); 379 380 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 381 data_buf = &iser_task->data[ISER_DIR_IN]; 382 prot_buf = &iser_task->prot[ISER_DIR_IN]; 383 } else { 384 data_buf = &iser_task->data[ISER_DIR_OUT]; 385 prot_buf = &iser_task->prot[ISER_DIR_OUT]; 386 } 387 388 if (scsi_sg_count(sc)) { /* using a scatter list */ 389 data_buf->sg = scsi_sglist(sc); 390 data_buf->size = scsi_sg_count(sc); 391 } 392 data_buf->data_len = scsi_bufflen(sc); 393 394 if (scsi_prot_sg_count(sc)) { 395 prot_buf->sg = scsi_prot_sglist(sc); 396 prot_buf->size = scsi_prot_sg_count(sc); 397 prot_buf->data_len = (data_buf->data_len >> 398 ilog2(sc->device->sector_size)) * 8; 399 } 400 401 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 402 err = iser_prepare_read_cmd(task); 403 if (err) 404 goto send_command_error; 405 } 406 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { 407 err = iser_prepare_write_cmd(task, 408 task->imm_count, 409 task->imm_count + 410 task->unsol_r2t.data_length, 411 edtl); 412 if (err) 413 goto send_command_error; 414 } 415 416 iser_task->status = ISER_TASK_STATUS_STARTED; 417 418 err = iser_post_send(&iser_conn->ib_conn, tx_desc, 419 iser_signal_comp(sig_count)); 420 if (!err) 421 return 0; 422 423 send_command_error: 424 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); 425 return err; 426 } 427 428 /** 429 * iser_send_data_out - send data out PDU 430 */ 431 int iser_send_data_out(struct iscsi_conn *conn, 432 struct iscsi_task *task, 433 struct iscsi_data *hdr) 434 { 435 struct iser_conn *iser_conn = conn->dd_data; 436 struct iscsi_iser_task *iser_task = task->dd_data; 437 struct iser_tx_desc *tx_desc = NULL; 438 struct iser_mem_reg *mem_reg; 439 unsigned long buf_offset; 440 unsigned long data_seg_len; 441 uint32_t itt; 442 int err; 443 struct ib_sge *tx_dsg; 444 445 itt = (__force uint32_t)hdr->itt; 446 data_seg_len = ntoh24(hdr->dlength); 447 buf_offset = ntohl(hdr->offset); 448 449 iser_dbg("%s itt %d dseg_len %d offset %d\n", 450 __func__,(int)itt,(int)data_seg_len,(int)buf_offset); 451 452 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); 453 if (tx_desc == NULL) { 454 iser_err("Failed to alloc desc for post dataout\n"); 455 return -ENOMEM; 456 } 457 458 tx_desc->type = ISCSI_TX_DATAOUT; 459 tx_desc->cqe.done = iser_dataout_comp; 460 tx_desc->iser_header.flags = ISER_VER; 461 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); 462 463 /* build the tx desc */ 464 err = iser_initialize_task_headers(task, tx_desc); 465 if (err) 466 goto send_data_out_error; 467 468 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT]; 469 tx_dsg = &tx_desc->tx_sg[1]; 470 tx_dsg->addr = mem_reg->sge.addr + buf_offset; 471 tx_dsg->length = data_seg_len; 472 tx_dsg->lkey = mem_reg->sge.lkey; 473 tx_desc->num_sge = 2; 474 475 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { 476 iser_err("Offset:%ld & DSL:%ld in Data-Out " 477 "inconsistent with total len:%ld, itt:%d\n", 478 buf_offset, data_seg_len, 479 iser_task->data[ISER_DIR_OUT].data_len, itt); 480 err = -EINVAL; 481 goto send_data_out_error; 482 } 483 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", 484 itt, buf_offset, data_seg_len); 485 486 487 err = iser_post_send(&iser_conn->ib_conn, tx_desc, true); 488 if (!err) 489 return 0; 490 491 send_data_out_error: 492 kmem_cache_free(ig.desc_cache, tx_desc); 493 iser_err("conn %p failed err %d\n", conn, err); 494 return err; 495 } 496 497 int iser_send_control(struct iscsi_conn *conn, 498 struct iscsi_task *task) 499 { 500 struct iser_conn *iser_conn = conn->dd_data; 501 struct iscsi_iser_task *iser_task = task->dd_data; 502 struct iser_tx_desc *mdesc = &iser_task->desc; 503 unsigned long data_seg_len; 504 int err = 0; 505 struct iser_device *device; 506 507 /* build the tx desc regd header and add it to the tx desc dto */ 508 mdesc->type = ISCSI_TX_CONTROL; 509 mdesc->cqe.done = iser_ctrl_comp; 510 iser_create_send_desc(iser_conn, mdesc); 511 512 device = iser_conn->ib_conn.device; 513 514 data_seg_len = ntoh24(task->hdr->dlength); 515 516 if (data_seg_len > 0) { 517 struct iser_login_desc *desc = &iser_conn->login_desc; 518 struct ib_sge *tx_dsg = &mdesc->tx_sg[1]; 519 520 if (task != conn->login_task) { 521 iser_err("data present on non login task!!!\n"); 522 goto send_control_error; 523 } 524 525 ib_dma_sync_single_for_cpu(device->ib_device, desc->req_dma, 526 task->data_count, DMA_TO_DEVICE); 527 528 memcpy(desc->req, task->data, task->data_count); 529 530 ib_dma_sync_single_for_device(device->ib_device, desc->req_dma, 531 task->data_count, DMA_TO_DEVICE); 532 533 tx_dsg->addr = desc->req_dma; 534 tx_dsg->length = task->data_count; 535 tx_dsg->lkey = device->pd->local_dma_lkey; 536 mdesc->num_sge = 2; 537 } 538 539 if (task == conn->login_task) { 540 iser_dbg("op %x dsl %lx, posting login rx buffer\n", 541 task->hdr->opcode, data_seg_len); 542 err = iser_post_recvl(iser_conn); 543 if (err) 544 goto send_control_error; 545 err = iser_post_rx_bufs(conn, task->hdr); 546 if (err) 547 goto send_control_error; 548 } 549 550 err = iser_post_send(&iser_conn->ib_conn, mdesc, true); 551 if (!err) 552 return 0; 553 554 send_control_error: 555 iser_err("conn %p failed err %d\n",conn, err); 556 return err; 557 } 558 559 void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc) 560 { 561 struct ib_conn *ib_conn = wc->qp->qp_context; 562 struct iser_conn *iser_conn = to_iser_conn(ib_conn); 563 struct iser_login_desc *desc = iser_login(wc->wr_cqe); 564 struct iscsi_hdr *hdr; 565 char *data; 566 int length; 567 568 if (unlikely(wc->status != IB_WC_SUCCESS)) { 569 iser_err_comp(wc, "login_rsp"); 570 return; 571 } 572 573 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, 574 desc->rsp_dma, ISER_RX_LOGIN_SIZE, 575 DMA_FROM_DEVICE); 576 577 hdr = desc->rsp + sizeof(struct iser_ctrl); 578 data = desc->rsp + ISER_HEADERS_LEN; 579 length = wc->byte_len - ISER_HEADERS_LEN; 580 581 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 582 hdr->itt, length); 583 584 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, data, length); 585 586 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 587 desc->rsp_dma, ISER_RX_LOGIN_SIZE, 588 DMA_FROM_DEVICE); 589 590 ib_conn->post_recv_buf_count--; 591 } 592 593 static inline void 594 iser_inv_desc(struct iser_fr_desc *desc, u32 rkey) 595 { 596 if (likely(rkey == desc->rsc.mr->rkey)) 597 desc->rsc.mr_valid = 0; 598 else if (likely(rkey == desc->pi_ctx->sig_mr->rkey)) 599 desc->pi_ctx->sig_mr_valid = 0; 600 } 601 602 static int 603 iser_check_remote_inv(struct iser_conn *iser_conn, 604 struct ib_wc *wc, 605 struct iscsi_hdr *hdr) 606 { 607 if (wc->wc_flags & IB_WC_WITH_INVALIDATE) { 608 struct iscsi_task *task; 609 u32 rkey = wc->ex.invalidate_rkey; 610 611 iser_dbg("conn %p: remote invalidation for rkey %#x\n", 612 iser_conn, rkey); 613 614 if (unlikely(!iser_conn->snd_w_inv)) { 615 iser_err("conn %p: unexepected remote invalidation, " 616 "terminating connection\n", iser_conn); 617 return -EPROTO; 618 } 619 620 task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt); 621 if (likely(task)) { 622 struct iscsi_iser_task *iser_task = task->dd_data; 623 struct iser_fr_desc *desc; 624 625 if (iser_task->dir[ISER_DIR_IN]) { 626 desc = iser_task->rdma_reg[ISER_DIR_IN].mem_h; 627 iser_inv_desc(desc, rkey); 628 } 629 630 if (iser_task->dir[ISER_DIR_OUT]) { 631 desc = iser_task->rdma_reg[ISER_DIR_OUT].mem_h; 632 iser_inv_desc(desc, rkey); 633 } 634 } else { 635 iser_err("failed to get task for itt=%d\n", hdr->itt); 636 return -EINVAL; 637 } 638 } 639 640 return 0; 641 } 642 643 644 void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc) 645 { 646 struct ib_conn *ib_conn = wc->qp->qp_context; 647 struct iser_conn *iser_conn = to_iser_conn(ib_conn); 648 struct iser_rx_desc *desc = iser_rx(wc->wr_cqe); 649 struct iscsi_hdr *hdr; 650 int length; 651 int outstanding, count, err; 652 653 if (unlikely(wc->status != IB_WC_SUCCESS)) { 654 iser_err_comp(wc, "task_rsp"); 655 return; 656 } 657 658 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, 659 desc->dma_addr, ISER_RX_PAYLOAD_SIZE, 660 DMA_FROM_DEVICE); 661 662 hdr = &desc->iscsi_header; 663 length = wc->byte_len - ISER_HEADERS_LEN; 664 665 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 666 hdr->itt, length); 667 668 if (iser_check_remote_inv(iser_conn, wc, hdr)) { 669 iscsi_conn_failure(iser_conn->iscsi_conn, 670 ISCSI_ERR_CONN_FAILED); 671 return; 672 } 673 674 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length); 675 676 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 677 desc->dma_addr, ISER_RX_PAYLOAD_SIZE, 678 DMA_FROM_DEVICE); 679 680 /* decrementing conn->post_recv_buf_count only --after-- freeing the * 681 * task eliminates the need to worry on tasks which are completed in * 682 * parallel to the execution of iser_conn_term. So the code that waits * 683 * for the posted rx bufs refcount to become zero handles everything */ 684 ib_conn->post_recv_buf_count--; 685 686 outstanding = ib_conn->post_recv_buf_count; 687 if (outstanding + iser_conn->min_posted_rx <= iser_conn->qp_max_recv_dtos) { 688 count = min(iser_conn->qp_max_recv_dtos - outstanding, 689 iser_conn->min_posted_rx); 690 err = iser_post_recvm(iser_conn, count); 691 if (err) 692 iser_err("posting %d rx bufs err %d\n", count, err); 693 } 694 } 695 696 void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc) 697 { 698 if (unlikely(wc->status != IB_WC_SUCCESS)) 699 iser_err_comp(wc, "command"); 700 } 701 702 void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc) 703 { 704 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe); 705 struct iscsi_task *task; 706 707 if (unlikely(wc->status != IB_WC_SUCCESS)) { 708 iser_err_comp(wc, "control"); 709 return; 710 } 711 712 /* this arithmetic is legal by libiscsi dd_data allocation */ 713 task = (void *)desc - sizeof(struct iscsi_task); 714 if (task->hdr->itt == RESERVED_ITT) 715 iscsi_put_task(task); 716 } 717 718 void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc) 719 { 720 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe); 721 struct ib_conn *ib_conn = wc->qp->qp_context; 722 struct iser_device *device = ib_conn->device; 723 724 if (unlikely(wc->status != IB_WC_SUCCESS)) 725 iser_err_comp(wc, "dataout"); 726 727 ib_dma_unmap_single(device->ib_device, desc->dma_addr, 728 ISER_HEADERS_LEN, DMA_TO_DEVICE); 729 kmem_cache_free(ig.desc_cache, desc); 730 } 731 732 void iser_task_rdma_init(struct iscsi_iser_task *iser_task) 733 734 { 735 iser_task->status = ISER_TASK_STATUS_INIT; 736 737 iser_task->dir[ISER_DIR_IN] = 0; 738 iser_task->dir[ISER_DIR_OUT] = 0; 739 740 iser_task->data[ISER_DIR_IN].data_len = 0; 741 iser_task->data[ISER_DIR_OUT].data_len = 0; 742 743 iser_task->prot[ISER_DIR_IN].data_len = 0; 744 iser_task->prot[ISER_DIR_OUT].data_len = 0; 745 746 memset(&iser_task->rdma_reg[ISER_DIR_IN], 0, 747 sizeof(struct iser_mem_reg)); 748 memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0, 749 sizeof(struct iser_mem_reg)); 750 } 751 752 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) 753 { 754 int prot_count = scsi_prot_sg_count(iser_task->sc); 755 756 if (iser_task->dir[ISER_DIR_IN]) { 757 iser_unreg_rdma_mem(iser_task, ISER_DIR_IN); 758 iser_dma_unmap_task_data(iser_task, 759 &iser_task->data[ISER_DIR_IN], 760 DMA_FROM_DEVICE); 761 if (prot_count) 762 iser_dma_unmap_task_data(iser_task, 763 &iser_task->prot[ISER_DIR_IN], 764 DMA_FROM_DEVICE); 765 } 766 767 if (iser_task->dir[ISER_DIR_OUT]) { 768 iser_unreg_rdma_mem(iser_task, ISER_DIR_OUT); 769 iser_dma_unmap_task_data(iser_task, 770 &iser_task->data[ISER_DIR_OUT], 771 DMA_TO_DEVICE); 772 if (prot_count) 773 iser_dma_unmap_task_data(iser_task, 774 &iser_task->prot[ISER_DIR_OUT], 775 DMA_TO_DEVICE); 776 } 777 } 778