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_mem_fastreg(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_mem_fastreg(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 if (buf_out->data_len > imm_sz) { 141 hdr->write_stag = cpu_to_be32(mem_reg->rkey); 142 hdr->write_va = cpu_to_be64(mem_reg->sge.addr + unsol_sz); 143 } 144 145 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X 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 */ 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_ctrl)); 172 tx_desc->iser_header.flags = ISER_VER; 173 tx_desc->num_sge = 1; 174 } 175 176 static void iser_free_login_buf(struct iser_conn *iser_conn) 177 { 178 struct iser_device *device = iser_conn->ib_conn.device; 179 struct iser_login_desc *desc = &iser_conn->login_desc; 180 181 if (!desc->req) 182 return; 183 184 ib_dma_unmap_single(device->ib_device, desc->req_dma, 185 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 186 187 ib_dma_unmap_single(device->ib_device, desc->rsp_dma, 188 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 189 190 kfree(desc->req); 191 kfree(desc->rsp); 192 193 /* make sure we never redo any unmapping */ 194 desc->req = NULL; 195 desc->rsp = NULL; 196 } 197 198 static int iser_alloc_login_buf(struct iser_conn *iser_conn) 199 { 200 struct iser_device *device = iser_conn->ib_conn.device; 201 struct iser_login_desc *desc = &iser_conn->login_desc; 202 203 desc->req = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL); 204 if (!desc->req) 205 return -ENOMEM; 206 207 desc->req_dma = ib_dma_map_single(device->ib_device, desc->req, 208 ISCSI_DEF_MAX_RECV_SEG_LEN, 209 DMA_TO_DEVICE); 210 if (ib_dma_mapping_error(device->ib_device, 211 desc->req_dma)) 212 goto free_req; 213 214 desc->rsp = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL); 215 if (!desc->rsp) 216 goto unmap_req; 217 218 desc->rsp_dma = ib_dma_map_single(device->ib_device, desc->rsp, 219 ISER_RX_LOGIN_SIZE, 220 DMA_FROM_DEVICE); 221 if (ib_dma_mapping_error(device->ib_device, 222 desc->rsp_dma)) 223 goto free_rsp; 224 225 return 0; 226 227 free_rsp: 228 kfree(desc->rsp); 229 unmap_req: 230 ib_dma_unmap_single(device->ib_device, desc->req_dma, 231 ISCSI_DEF_MAX_RECV_SEG_LEN, 232 DMA_TO_DEVICE); 233 free_req: 234 kfree(desc->req); 235 236 return -ENOMEM; 237 } 238 239 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, 240 struct iscsi_session *session) 241 { 242 int i, j; 243 u64 dma_addr; 244 struct iser_rx_desc *rx_desc; 245 struct ib_sge *rx_sg; 246 struct ib_conn *ib_conn = &iser_conn->ib_conn; 247 struct iser_device *device = ib_conn->device; 248 249 iser_conn->qp_max_recv_dtos = session->cmds_max; 250 iser_conn->qp_max_recv_dtos_mask = session->cmds_max - 1; /* cmds_max is 2^N */ 251 iser_conn->min_posted_rx = iser_conn->qp_max_recv_dtos >> 2; 252 253 if (iser_alloc_fastreg_pool(ib_conn, session->scsi_cmds_max, 254 iser_conn->pages_per_mr)) 255 goto create_rdma_reg_res_failed; 256 257 if (iser_alloc_login_buf(iser_conn)) 258 goto alloc_login_buf_fail; 259 260 iser_conn->num_rx_descs = session->cmds_max; 261 iser_conn->rx_descs = kmalloc_array(iser_conn->num_rx_descs, 262 sizeof(struct iser_rx_desc), 263 GFP_KERNEL); 264 if (!iser_conn->rx_descs) 265 goto rx_desc_alloc_fail; 266 267 rx_desc = iser_conn->rx_descs; 268 269 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) { 270 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc, 271 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 272 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 273 goto rx_desc_dma_map_failed; 274 275 rx_desc->dma_addr = dma_addr; 276 rx_desc->cqe.done = iser_task_rsp; 277 rx_sg = &rx_desc->rx_sg; 278 rx_sg->addr = rx_desc->dma_addr; 279 rx_sg->length = ISER_RX_PAYLOAD_SIZE; 280 rx_sg->lkey = device->pd->local_dma_lkey; 281 } 282 283 iser_conn->rx_desc_head = 0; 284 return 0; 285 286 rx_desc_dma_map_failed: 287 rx_desc = iser_conn->rx_descs; 288 for (j = 0; j < i; j++, rx_desc++) 289 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 290 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 291 kfree(iser_conn->rx_descs); 292 iser_conn->rx_descs = NULL; 293 rx_desc_alloc_fail: 294 iser_free_login_buf(iser_conn); 295 alloc_login_buf_fail: 296 iser_free_fastreg_pool(ib_conn); 297 create_rdma_reg_res_failed: 298 iser_err("failed allocating rx descriptors / data buffers\n"); 299 return -ENOMEM; 300 } 301 302 void iser_free_rx_descriptors(struct iser_conn *iser_conn) 303 { 304 int i; 305 struct iser_rx_desc *rx_desc; 306 struct ib_conn *ib_conn = &iser_conn->ib_conn; 307 struct iser_device *device = ib_conn->device; 308 309 iser_free_fastreg_pool(ib_conn); 310 311 rx_desc = iser_conn->rx_descs; 312 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) 313 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 314 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 315 kfree(iser_conn->rx_descs); 316 /* make sure we never redo any unmapping */ 317 iser_conn->rx_descs = NULL; 318 319 iser_free_login_buf(iser_conn); 320 } 321 322 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req) 323 { 324 struct iser_conn *iser_conn = conn->dd_data; 325 struct ib_conn *ib_conn = &iser_conn->ib_conn; 326 struct iscsi_session *session = conn->session; 327 328 iser_dbg("req op %x flags %x\n", req->opcode, req->flags); 329 /* check if this is the last login - going to full feature phase */ 330 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE) 331 return 0; 332 333 /* 334 * Check that there is one posted recv buffer 335 * (for the last login response). 336 */ 337 WARN_ON(ib_conn->post_recv_buf_count != 1); 338 339 if (session->discovery_sess) { 340 iser_info("Discovery session, re-using login RX buffer\n"); 341 return 0; 342 } else 343 iser_info("Normal session, posting batch of RX %d buffers\n", 344 iser_conn->min_posted_rx); 345 346 /* Initial post receive buffers */ 347 if (iser_post_recvm(iser_conn, iser_conn->min_posted_rx)) 348 return -ENOMEM; 349 350 return 0; 351 } 352 353 static inline bool iser_signal_comp(u8 sig_count) 354 { 355 return ((sig_count % ISER_SIGNAL_CMD_COUNT) == 0); 356 } 357 358 /** 359 * iser_send_command - send command PDU 360 * @conn: link to matching iscsi connection 361 * @task: SCSI command task 362 */ 363 int iser_send_command(struct iscsi_conn *conn, 364 struct iscsi_task *task) 365 { 366 struct iser_conn *iser_conn = conn->dd_data; 367 struct iscsi_iser_task *iser_task = task->dd_data; 368 unsigned long edtl; 369 int err; 370 struct iser_data_buf *data_buf, *prot_buf; 371 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr; 372 struct scsi_cmnd *sc = task->sc; 373 struct iser_tx_desc *tx_desc = &iser_task->desc; 374 u8 sig_count = ++iser_conn->ib_conn.sig_count; 375 376 edtl = ntohl(hdr->data_length); 377 378 /* build the tx desc regd header and add it to the tx desc dto */ 379 tx_desc->type = ISCSI_TX_SCSI_COMMAND; 380 tx_desc->cqe.done = iser_cmd_comp; 381 iser_create_send_desc(iser_conn, tx_desc); 382 383 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 384 data_buf = &iser_task->data[ISER_DIR_IN]; 385 prot_buf = &iser_task->prot[ISER_DIR_IN]; 386 } else { 387 data_buf = &iser_task->data[ISER_DIR_OUT]; 388 prot_buf = &iser_task->prot[ISER_DIR_OUT]; 389 } 390 391 if (scsi_sg_count(sc)) { /* using a scatter list */ 392 data_buf->sg = scsi_sglist(sc); 393 data_buf->size = scsi_sg_count(sc); 394 } 395 data_buf->data_len = scsi_bufflen(sc); 396 397 if (scsi_prot_sg_count(sc)) { 398 prot_buf->sg = scsi_prot_sglist(sc); 399 prot_buf->size = scsi_prot_sg_count(sc); 400 prot_buf->data_len = (data_buf->data_len >> 401 ilog2(sc->device->sector_size)) * 8; 402 } 403 404 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 405 err = iser_prepare_read_cmd(task); 406 if (err) 407 goto send_command_error; 408 } 409 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { 410 err = iser_prepare_write_cmd(task, 411 task->imm_count, 412 task->imm_count + 413 task->unsol_r2t.data_length, 414 edtl); 415 if (err) 416 goto send_command_error; 417 } 418 419 iser_task->status = ISER_TASK_STATUS_STARTED; 420 421 err = iser_post_send(&iser_conn->ib_conn, tx_desc, 422 iser_signal_comp(sig_count)); 423 if (!err) 424 return 0; 425 426 send_command_error: 427 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); 428 return err; 429 } 430 431 /** 432 * iser_send_data_out - send data out PDU 433 * @conn: link to matching iscsi connection 434 * @task: SCSI command task 435 * @hdr: pointer to the LLD's iSCSI message header 436 */ 437 int iser_send_data_out(struct iscsi_conn *conn, 438 struct iscsi_task *task, 439 struct iscsi_data *hdr) 440 { 441 struct iser_conn *iser_conn = conn->dd_data; 442 struct iscsi_iser_task *iser_task = task->dd_data; 443 struct iser_tx_desc *tx_desc; 444 struct iser_mem_reg *mem_reg; 445 unsigned long buf_offset; 446 unsigned long data_seg_len; 447 uint32_t itt; 448 int err; 449 struct ib_sge *tx_dsg; 450 451 itt = (__force uint32_t)hdr->itt; 452 data_seg_len = ntoh24(hdr->dlength); 453 buf_offset = ntohl(hdr->offset); 454 455 iser_dbg("%s itt %d dseg_len %d offset %d\n", 456 __func__,(int)itt,(int)data_seg_len,(int)buf_offset); 457 458 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); 459 if (!tx_desc) 460 return -ENOMEM; 461 462 tx_desc->type = ISCSI_TX_DATAOUT; 463 tx_desc->cqe.done = iser_dataout_comp; 464 tx_desc->iser_header.flags = ISER_VER; 465 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); 466 467 /* build the tx desc */ 468 err = iser_initialize_task_headers(task, tx_desc); 469 if (err) 470 goto send_data_out_error; 471 472 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT]; 473 tx_dsg = &tx_desc->tx_sg[1]; 474 tx_dsg->addr = mem_reg->sge.addr + buf_offset; 475 tx_dsg->length = data_seg_len; 476 tx_dsg->lkey = mem_reg->sge.lkey; 477 tx_desc->num_sge = 2; 478 479 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { 480 iser_err("Offset:%ld & DSL:%ld in Data-Out inconsistent with total len:%ld, itt:%d\n", 481 buf_offset, data_seg_len, 482 iser_task->data[ISER_DIR_OUT].data_len, itt); 483 err = -EINVAL; 484 goto send_data_out_error; 485 } 486 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", 487 itt, buf_offset, data_seg_len); 488 489 490 err = iser_post_send(&iser_conn->ib_conn, tx_desc, true); 491 if (!err) 492 return 0; 493 494 send_data_out_error: 495 kmem_cache_free(ig.desc_cache, tx_desc); 496 iser_err("conn %p failed err %d\n", conn, err); 497 return err; 498 } 499 500 int iser_send_control(struct iscsi_conn *conn, 501 struct iscsi_task *task) 502 { 503 struct iser_conn *iser_conn = conn->dd_data; 504 struct iscsi_iser_task *iser_task = task->dd_data; 505 struct iser_tx_desc *mdesc = &iser_task->desc; 506 unsigned long data_seg_len; 507 int err = 0; 508 struct iser_device *device; 509 510 /* build the tx desc regd header and add it to the tx desc dto */ 511 mdesc->type = ISCSI_TX_CONTROL; 512 mdesc->cqe.done = iser_ctrl_comp; 513 iser_create_send_desc(iser_conn, mdesc); 514 515 device = iser_conn->ib_conn.device; 516 517 data_seg_len = ntoh24(task->hdr->dlength); 518 519 if (data_seg_len > 0) { 520 struct iser_login_desc *desc = &iser_conn->login_desc; 521 struct ib_sge *tx_dsg = &mdesc->tx_sg[1]; 522 523 if (task != conn->login_task) { 524 iser_err("data present on non login task!!!\n"); 525 goto send_control_error; 526 } 527 528 ib_dma_sync_single_for_cpu(device->ib_device, desc->req_dma, 529 task->data_count, DMA_TO_DEVICE); 530 531 memcpy(desc->req, task->data, task->data_count); 532 533 ib_dma_sync_single_for_device(device->ib_device, desc->req_dma, 534 task->data_count, DMA_TO_DEVICE); 535 536 tx_dsg->addr = desc->req_dma; 537 tx_dsg->length = task->data_count; 538 tx_dsg->lkey = device->pd->local_dma_lkey; 539 mdesc->num_sge = 2; 540 } 541 542 if (task == conn->login_task) { 543 iser_dbg("op %x dsl %lx, posting login rx buffer\n", 544 task->hdr->opcode, data_seg_len); 545 err = iser_post_recvl(iser_conn); 546 if (err) 547 goto send_control_error; 548 err = iser_post_rx_bufs(conn, task->hdr); 549 if (err) 550 goto send_control_error; 551 } 552 553 err = iser_post_send(&iser_conn->ib_conn, mdesc, true); 554 if (!err) 555 return 0; 556 557 send_control_error: 558 iser_err("conn %p failed err %d\n",conn, err); 559 return err; 560 } 561 562 void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc) 563 { 564 struct ib_conn *ib_conn = wc->qp->qp_context; 565 struct iser_conn *iser_conn = to_iser_conn(ib_conn); 566 struct iser_login_desc *desc = iser_login(wc->wr_cqe); 567 struct iscsi_hdr *hdr; 568 char *data; 569 int length; 570 571 if (unlikely(wc->status != IB_WC_SUCCESS)) { 572 iser_err_comp(wc, "login_rsp"); 573 return; 574 } 575 576 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, 577 desc->rsp_dma, ISER_RX_LOGIN_SIZE, 578 DMA_FROM_DEVICE); 579 580 hdr = desc->rsp + sizeof(struct iser_ctrl); 581 data = desc->rsp + ISER_HEADERS_LEN; 582 length = wc->byte_len - ISER_HEADERS_LEN; 583 584 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 585 hdr->itt, length); 586 587 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, data, length); 588 589 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 590 desc->rsp_dma, ISER_RX_LOGIN_SIZE, 591 DMA_FROM_DEVICE); 592 593 ib_conn->post_recv_buf_count--; 594 } 595 596 static inline int 597 iser_inv_desc(struct iser_fr_desc *desc, u32 rkey) 598 { 599 if (unlikely((!desc->sig_protected && rkey != desc->rsc.mr->rkey) || 600 (desc->sig_protected && rkey != desc->rsc.sig_mr->rkey))) { 601 iser_err("Bogus remote invalidation for rkey %#x\n", rkey); 602 return -EINVAL; 603 } 604 605 desc->rsc.mr_valid = 0; 606 607 return 0; 608 } 609 610 static int 611 iser_check_remote_inv(struct iser_conn *iser_conn, 612 struct ib_wc *wc, 613 struct iscsi_hdr *hdr) 614 { 615 if (wc->wc_flags & IB_WC_WITH_INVALIDATE) { 616 struct iscsi_task *task; 617 u32 rkey = wc->ex.invalidate_rkey; 618 619 iser_dbg("conn %p: remote invalidation for rkey %#x\n", 620 iser_conn, rkey); 621 622 if (unlikely(!iser_conn->snd_w_inv)) { 623 iser_err("conn %p: unexpected remote invalidation, terminating connection\n", 624 iser_conn); 625 return -EPROTO; 626 } 627 628 task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt); 629 if (likely(task)) { 630 struct iscsi_iser_task *iser_task = task->dd_data; 631 struct iser_fr_desc *desc; 632 633 if (iser_task->dir[ISER_DIR_IN]) { 634 desc = iser_task->rdma_reg[ISER_DIR_IN].mem_h; 635 if (unlikely(iser_inv_desc(desc, rkey))) 636 return -EINVAL; 637 } 638 639 if (iser_task->dir[ISER_DIR_OUT]) { 640 desc = iser_task->rdma_reg[ISER_DIR_OUT].mem_h; 641 if (unlikely(iser_inv_desc(desc, rkey))) 642 return -EINVAL; 643 } 644 } else { 645 iser_err("failed to get task for itt=%d\n", hdr->itt); 646 return -EINVAL; 647 } 648 } 649 650 return 0; 651 } 652 653 654 void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc) 655 { 656 struct ib_conn *ib_conn = wc->qp->qp_context; 657 struct iser_conn *iser_conn = to_iser_conn(ib_conn); 658 struct iser_rx_desc *desc = iser_rx(wc->wr_cqe); 659 struct iscsi_hdr *hdr; 660 int length; 661 int outstanding, count, err; 662 663 if (unlikely(wc->status != IB_WC_SUCCESS)) { 664 iser_err_comp(wc, "task_rsp"); 665 return; 666 } 667 668 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, 669 desc->dma_addr, ISER_RX_PAYLOAD_SIZE, 670 DMA_FROM_DEVICE); 671 672 hdr = &desc->iscsi_header; 673 length = wc->byte_len - ISER_HEADERS_LEN; 674 675 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 676 hdr->itt, length); 677 678 if (iser_check_remote_inv(iser_conn, wc, hdr)) { 679 iscsi_conn_failure(iser_conn->iscsi_conn, 680 ISCSI_ERR_CONN_FAILED); 681 return; 682 } 683 684 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length); 685 686 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 687 desc->dma_addr, ISER_RX_PAYLOAD_SIZE, 688 DMA_FROM_DEVICE); 689 690 /* decrementing conn->post_recv_buf_count only --after-- freeing the * 691 * task eliminates the need to worry on tasks which are completed in * 692 * parallel to the execution of iser_conn_term. So the code that waits * 693 * for the posted rx bufs refcount to become zero handles everything */ 694 ib_conn->post_recv_buf_count--; 695 696 outstanding = ib_conn->post_recv_buf_count; 697 if (outstanding + iser_conn->min_posted_rx <= iser_conn->qp_max_recv_dtos) { 698 count = min(iser_conn->qp_max_recv_dtos - outstanding, 699 iser_conn->min_posted_rx); 700 err = iser_post_recvm(iser_conn, count); 701 if (err) 702 iser_err("posting %d rx bufs err %d\n", count, err); 703 } 704 } 705 706 void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc) 707 { 708 if (unlikely(wc->status != IB_WC_SUCCESS)) 709 iser_err_comp(wc, "command"); 710 } 711 712 void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc) 713 { 714 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe); 715 struct iscsi_task *task; 716 717 if (unlikely(wc->status != IB_WC_SUCCESS)) { 718 iser_err_comp(wc, "control"); 719 return; 720 } 721 722 /* this arithmetic is legal by libiscsi dd_data allocation */ 723 task = (void *)desc - sizeof(struct iscsi_task); 724 if (task->hdr->itt == RESERVED_ITT) 725 iscsi_put_task(task); 726 } 727 728 void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc) 729 { 730 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe); 731 struct ib_conn *ib_conn = wc->qp->qp_context; 732 struct iser_device *device = ib_conn->device; 733 734 if (unlikely(wc->status != IB_WC_SUCCESS)) 735 iser_err_comp(wc, "dataout"); 736 737 ib_dma_unmap_single(device->ib_device, desc->dma_addr, 738 ISER_HEADERS_LEN, DMA_TO_DEVICE); 739 kmem_cache_free(ig.desc_cache, desc); 740 } 741 742 void iser_task_rdma_init(struct iscsi_iser_task *iser_task) 743 744 { 745 iser_task->status = ISER_TASK_STATUS_INIT; 746 747 iser_task->dir[ISER_DIR_IN] = 0; 748 iser_task->dir[ISER_DIR_OUT] = 0; 749 750 iser_task->data[ISER_DIR_IN].data_len = 0; 751 iser_task->data[ISER_DIR_OUT].data_len = 0; 752 753 iser_task->prot[ISER_DIR_IN].data_len = 0; 754 iser_task->prot[ISER_DIR_OUT].data_len = 0; 755 756 iser_task->prot[ISER_DIR_IN].dma_nents = 0; 757 iser_task->prot[ISER_DIR_OUT].dma_nents = 0; 758 759 memset(&iser_task->rdma_reg[ISER_DIR_IN], 0, 760 sizeof(struct iser_mem_reg)); 761 memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0, 762 sizeof(struct iser_mem_reg)); 763 } 764 765 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) 766 { 767 int prot_count = scsi_prot_sg_count(iser_task->sc); 768 769 if (iser_task->dir[ISER_DIR_IN]) { 770 iser_unreg_mem_fastreg(iser_task, ISER_DIR_IN); 771 iser_dma_unmap_task_data(iser_task, 772 &iser_task->data[ISER_DIR_IN], 773 DMA_FROM_DEVICE); 774 if (prot_count) 775 iser_dma_unmap_task_data(iser_task, 776 &iser_task->prot[ISER_DIR_IN], 777 DMA_FROM_DEVICE); 778 } 779 780 if (iser_task->dir[ISER_DIR_OUT]) { 781 iser_unreg_mem_fastreg(iser_task, ISER_DIR_OUT); 782 iser_dma_unmap_task_data(iser_task, 783 &iser_task->data[ISER_DIR_OUT], 784 DMA_TO_DEVICE); 785 if (prot_count) 786 iser_dma_unmap_task_data(iser_task, 787 &iser_task->prot[ISER_DIR_OUT], 788 DMA_TO_DEVICE); 789 } 790 } 791