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 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 (device->reg_ops->alloc_reg_res(ib_conn, session->scsi_cmds_max, 254 iser_conn->scsi_sg_tablesize)) 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(iser_conn->num_rx_descs * 262 sizeof(struct iser_rx_desc), GFP_KERNEL); 263 if (!iser_conn->rx_descs) 264 goto rx_desc_alloc_fail; 265 266 rx_desc = iser_conn->rx_descs; 267 268 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) { 269 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc, 270 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 271 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 272 goto rx_desc_dma_map_failed; 273 274 rx_desc->dma_addr = dma_addr; 275 rx_desc->cqe.done = iser_task_rsp; 276 rx_sg = &rx_desc->rx_sg; 277 rx_sg->addr = rx_desc->dma_addr; 278 rx_sg->length = ISER_RX_PAYLOAD_SIZE; 279 rx_sg->lkey = device->pd->local_dma_lkey; 280 } 281 282 iser_conn->rx_desc_head = 0; 283 return 0; 284 285 rx_desc_dma_map_failed: 286 rx_desc = iser_conn->rx_descs; 287 for (j = 0; j < i; j++, rx_desc++) 288 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 289 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 290 kfree(iser_conn->rx_descs); 291 iser_conn->rx_descs = NULL; 292 rx_desc_alloc_fail: 293 iser_free_login_buf(iser_conn); 294 alloc_login_buf_fail: 295 device->reg_ops->free_reg_res(ib_conn); 296 create_rdma_reg_res_failed: 297 iser_err("failed allocating rx descriptors / data buffers\n"); 298 return -ENOMEM; 299 } 300 301 void iser_free_rx_descriptors(struct iser_conn *iser_conn) 302 { 303 int i; 304 struct iser_rx_desc *rx_desc; 305 struct ib_conn *ib_conn = &iser_conn->ib_conn; 306 struct iser_device *device = ib_conn->device; 307 308 if (device->reg_ops->free_reg_res) 309 device->reg_ops->free_reg_res(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 */ 361 int iser_send_command(struct iscsi_conn *conn, 362 struct iscsi_task *task) 363 { 364 struct iser_conn *iser_conn = conn->dd_data; 365 struct iscsi_iser_task *iser_task = task->dd_data; 366 unsigned long edtl; 367 int err; 368 struct iser_data_buf *data_buf, *prot_buf; 369 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr; 370 struct scsi_cmnd *sc = task->sc; 371 struct iser_tx_desc *tx_desc = &iser_task->desc; 372 u8 sig_count = ++iser_conn->ib_conn.sig_count; 373 374 edtl = ntohl(hdr->data_length); 375 376 /* build the tx desc regd header and add it to the tx desc dto */ 377 tx_desc->type = ISCSI_TX_SCSI_COMMAND; 378 tx_desc->cqe.done = iser_cmd_comp; 379 iser_create_send_desc(iser_conn, tx_desc); 380 381 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 382 data_buf = &iser_task->data[ISER_DIR_IN]; 383 prot_buf = &iser_task->prot[ISER_DIR_IN]; 384 } else { 385 data_buf = &iser_task->data[ISER_DIR_OUT]; 386 prot_buf = &iser_task->prot[ISER_DIR_OUT]; 387 } 388 389 if (scsi_sg_count(sc)) { /* using a scatter list */ 390 data_buf->sg = scsi_sglist(sc); 391 data_buf->size = scsi_sg_count(sc); 392 } 393 data_buf->data_len = scsi_bufflen(sc); 394 395 if (scsi_prot_sg_count(sc)) { 396 prot_buf->sg = scsi_prot_sglist(sc); 397 prot_buf->size = scsi_prot_sg_count(sc); 398 prot_buf->data_len = (data_buf->data_len >> 399 ilog2(sc->device->sector_size)) * 8; 400 } 401 402 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 403 err = iser_prepare_read_cmd(task); 404 if (err) 405 goto send_command_error; 406 } 407 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { 408 err = iser_prepare_write_cmd(task, 409 task->imm_count, 410 task->imm_count + 411 task->unsol_r2t.data_length, 412 edtl); 413 if (err) 414 goto send_command_error; 415 } 416 417 iser_task->status = ISER_TASK_STATUS_STARTED; 418 419 err = iser_post_send(&iser_conn->ib_conn, tx_desc, 420 iser_signal_comp(sig_count)); 421 if (!err) 422 return 0; 423 424 send_command_error: 425 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); 426 return err; 427 } 428 429 /** 430 * iser_send_data_out - send data out PDU 431 */ 432 int iser_send_data_out(struct iscsi_conn *conn, 433 struct iscsi_task *task, 434 struct iscsi_data *hdr) 435 { 436 struct iser_conn *iser_conn = conn->dd_data; 437 struct iscsi_iser_task *iser_task = task->dd_data; 438 struct iser_tx_desc *tx_desc; 439 struct iser_mem_reg *mem_reg; 440 unsigned long buf_offset; 441 unsigned long data_seg_len; 442 uint32_t itt; 443 int err; 444 struct ib_sge *tx_dsg; 445 446 itt = (__force uint32_t)hdr->itt; 447 data_seg_len = ntoh24(hdr->dlength); 448 buf_offset = ntohl(hdr->offset); 449 450 iser_dbg("%s itt %d dseg_len %d offset %d\n", 451 __func__,(int)itt,(int)data_seg_len,(int)buf_offset); 452 453 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); 454 if (!tx_desc) 455 return -ENOMEM; 456 457 tx_desc->type = ISCSI_TX_DATAOUT; 458 tx_desc->cqe.done = iser_dataout_comp; 459 tx_desc->iser_header.flags = ISER_VER; 460 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); 461 462 /* build the tx desc */ 463 err = iser_initialize_task_headers(task, tx_desc); 464 if (err) 465 goto send_data_out_error; 466 467 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT]; 468 tx_dsg = &tx_desc->tx_sg[1]; 469 tx_dsg->addr = mem_reg->sge.addr + buf_offset; 470 tx_dsg->length = data_seg_len; 471 tx_dsg->lkey = mem_reg->sge.lkey; 472 tx_desc->num_sge = 2; 473 474 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { 475 iser_err("Offset:%ld & DSL:%ld in Data-Out inconsistent with total len:%ld, itt:%d\n", 476 buf_offset, data_seg_len, 477 iser_task->data[ISER_DIR_OUT].data_len, itt); 478 err = -EINVAL; 479 goto send_data_out_error; 480 } 481 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", 482 itt, buf_offset, data_seg_len); 483 484 485 err = iser_post_send(&iser_conn->ib_conn, tx_desc, true); 486 if (!err) 487 return 0; 488 489 send_data_out_error: 490 kmem_cache_free(ig.desc_cache, tx_desc); 491 iser_err("conn %p failed err %d\n", conn, err); 492 return err; 493 } 494 495 int iser_send_control(struct iscsi_conn *conn, 496 struct iscsi_task *task) 497 { 498 struct iser_conn *iser_conn = conn->dd_data; 499 struct iscsi_iser_task *iser_task = task->dd_data; 500 struct iser_tx_desc *mdesc = &iser_task->desc; 501 unsigned long data_seg_len; 502 int err = 0; 503 struct iser_device *device; 504 505 /* build the tx desc regd header and add it to the tx desc dto */ 506 mdesc->type = ISCSI_TX_CONTROL; 507 mdesc->cqe.done = iser_ctrl_comp; 508 iser_create_send_desc(iser_conn, mdesc); 509 510 device = iser_conn->ib_conn.device; 511 512 data_seg_len = ntoh24(task->hdr->dlength); 513 514 if (data_seg_len > 0) { 515 struct iser_login_desc *desc = &iser_conn->login_desc; 516 struct ib_sge *tx_dsg = &mdesc->tx_sg[1]; 517 518 if (task != conn->login_task) { 519 iser_err("data present on non login task!!!\n"); 520 goto send_control_error; 521 } 522 523 ib_dma_sync_single_for_cpu(device->ib_device, desc->req_dma, 524 task->data_count, DMA_TO_DEVICE); 525 526 memcpy(desc->req, task->data, task->data_count); 527 528 ib_dma_sync_single_for_device(device->ib_device, desc->req_dma, 529 task->data_count, DMA_TO_DEVICE); 530 531 tx_dsg->addr = desc->req_dma; 532 tx_dsg->length = task->data_count; 533 tx_dsg->lkey = device->pd->local_dma_lkey; 534 mdesc->num_sge = 2; 535 } 536 537 if (task == conn->login_task) { 538 iser_dbg("op %x dsl %lx, posting login rx buffer\n", 539 task->hdr->opcode, data_seg_len); 540 err = iser_post_recvl(iser_conn); 541 if (err) 542 goto send_control_error; 543 err = iser_post_rx_bufs(conn, task->hdr); 544 if (err) 545 goto send_control_error; 546 } 547 548 err = iser_post_send(&iser_conn->ib_conn, mdesc, true); 549 if (!err) 550 return 0; 551 552 send_control_error: 553 iser_err("conn %p failed err %d\n",conn, err); 554 return err; 555 } 556 557 void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc) 558 { 559 struct ib_conn *ib_conn = wc->qp->qp_context; 560 struct iser_conn *iser_conn = to_iser_conn(ib_conn); 561 struct iser_login_desc *desc = iser_login(wc->wr_cqe); 562 struct iscsi_hdr *hdr; 563 char *data; 564 int length; 565 566 if (unlikely(wc->status != IB_WC_SUCCESS)) { 567 iser_err_comp(wc, "login_rsp"); 568 return; 569 } 570 571 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, 572 desc->rsp_dma, ISER_RX_LOGIN_SIZE, 573 DMA_FROM_DEVICE); 574 575 hdr = desc->rsp + sizeof(struct iser_ctrl); 576 data = desc->rsp + ISER_HEADERS_LEN; 577 length = wc->byte_len - ISER_HEADERS_LEN; 578 579 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 580 hdr->itt, length); 581 582 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, data, length); 583 584 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 585 desc->rsp_dma, ISER_RX_LOGIN_SIZE, 586 DMA_FROM_DEVICE); 587 588 ib_conn->post_recv_buf_count--; 589 } 590 591 static inline void 592 iser_inv_desc(struct iser_fr_desc *desc, u32 rkey) 593 { 594 if (likely(rkey == desc->rsc.mr->rkey)) 595 desc->rsc.mr_valid = 0; 596 else if (likely(rkey == desc->pi_ctx->sig_mr->rkey)) 597 desc->pi_ctx->sig_mr_valid = 0; 598 } 599 600 static int 601 iser_check_remote_inv(struct iser_conn *iser_conn, 602 struct ib_wc *wc, 603 struct iscsi_hdr *hdr) 604 { 605 if (wc->wc_flags & IB_WC_WITH_INVALIDATE) { 606 struct iscsi_task *task; 607 u32 rkey = wc->ex.invalidate_rkey; 608 609 iser_dbg("conn %p: remote invalidation for rkey %#x\n", 610 iser_conn, rkey); 611 612 if (unlikely(!iser_conn->snd_w_inv)) { 613 iser_err("conn %p: unexpected remote invalidation, terminating connection\n", 614 iser_conn); 615 return -EPROTO; 616 } 617 618 task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt); 619 if (likely(task)) { 620 struct iscsi_iser_task *iser_task = task->dd_data; 621 struct iser_fr_desc *desc; 622 623 if (iser_task->dir[ISER_DIR_IN]) { 624 desc = iser_task->rdma_reg[ISER_DIR_IN].mem_h; 625 iser_inv_desc(desc, rkey); 626 } 627 628 if (iser_task->dir[ISER_DIR_OUT]) { 629 desc = iser_task->rdma_reg[ISER_DIR_OUT].mem_h; 630 iser_inv_desc(desc, rkey); 631 } 632 } else { 633 iser_err("failed to get task for itt=%d\n", hdr->itt); 634 return -EINVAL; 635 } 636 } 637 638 return 0; 639 } 640 641 642 void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc) 643 { 644 struct ib_conn *ib_conn = wc->qp->qp_context; 645 struct iser_conn *iser_conn = to_iser_conn(ib_conn); 646 struct iser_rx_desc *desc = iser_rx(wc->wr_cqe); 647 struct iscsi_hdr *hdr; 648 int length; 649 int outstanding, count, err; 650 651 if (unlikely(wc->status != IB_WC_SUCCESS)) { 652 iser_err_comp(wc, "task_rsp"); 653 return; 654 } 655 656 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, 657 desc->dma_addr, ISER_RX_PAYLOAD_SIZE, 658 DMA_FROM_DEVICE); 659 660 hdr = &desc->iscsi_header; 661 length = wc->byte_len - ISER_HEADERS_LEN; 662 663 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 664 hdr->itt, length); 665 666 if (iser_check_remote_inv(iser_conn, wc, hdr)) { 667 iscsi_conn_failure(iser_conn->iscsi_conn, 668 ISCSI_ERR_CONN_FAILED); 669 return; 670 } 671 672 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length); 673 674 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 675 desc->dma_addr, ISER_RX_PAYLOAD_SIZE, 676 DMA_FROM_DEVICE); 677 678 /* decrementing conn->post_recv_buf_count only --after-- freeing the * 679 * task eliminates the need to worry on tasks which are completed in * 680 * parallel to the execution of iser_conn_term. So the code that waits * 681 * for the posted rx bufs refcount to become zero handles everything */ 682 ib_conn->post_recv_buf_count--; 683 684 outstanding = ib_conn->post_recv_buf_count; 685 if (outstanding + iser_conn->min_posted_rx <= iser_conn->qp_max_recv_dtos) { 686 count = min(iser_conn->qp_max_recv_dtos - outstanding, 687 iser_conn->min_posted_rx); 688 err = iser_post_recvm(iser_conn, count); 689 if (err) 690 iser_err("posting %d rx bufs err %d\n", count, err); 691 } 692 } 693 694 void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc) 695 { 696 if (unlikely(wc->status != IB_WC_SUCCESS)) 697 iser_err_comp(wc, "command"); 698 } 699 700 void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc) 701 { 702 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe); 703 struct iscsi_task *task; 704 705 if (unlikely(wc->status != IB_WC_SUCCESS)) { 706 iser_err_comp(wc, "control"); 707 return; 708 } 709 710 /* this arithmetic is legal by libiscsi dd_data allocation */ 711 task = (void *)desc - sizeof(struct iscsi_task); 712 if (task->hdr->itt == RESERVED_ITT) 713 iscsi_put_task(task); 714 } 715 716 void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc) 717 { 718 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe); 719 struct ib_conn *ib_conn = wc->qp->qp_context; 720 struct iser_device *device = ib_conn->device; 721 722 if (unlikely(wc->status != IB_WC_SUCCESS)) 723 iser_err_comp(wc, "dataout"); 724 725 ib_dma_unmap_single(device->ib_device, desc->dma_addr, 726 ISER_HEADERS_LEN, DMA_TO_DEVICE); 727 kmem_cache_free(ig.desc_cache, desc); 728 } 729 730 void iser_task_rdma_init(struct iscsi_iser_task *iser_task) 731 732 { 733 iser_task->status = ISER_TASK_STATUS_INIT; 734 735 iser_task->dir[ISER_DIR_IN] = 0; 736 iser_task->dir[ISER_DIR_OUT] = 0; 737 738 iser_task->data[ISER_DIR_IN].data_len = 0; 739 iser_task->data[ISER_DIR_OUT].data_len = 0; 740 741 iser_task->prot[ISER_DIR_IN].data_len = 0; 742 iser_task->prot[ISER_DIR_OUT].data_len = 0; 743 744 memset(&iser_task->rdma_reg[ISER_DIR_IN], 0, 745 sizeof(struct iser_mem_reg)); 746 memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0, 747 sizeof(struct iser_mem_reg)); 748 } 749 750 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) 751 { 752 int prot_count = scsi_prot_sg_count(iser_task->sc); 753 754 if (iser_task->dir[ISER_DIR_IN]) { 755 iser_unreg_rdma_mem(iser_task, ISER_DIR_IN); 756 iser_dma_unmap_task_data(iser_task, 757 &iser_task->data[ISER_DIR_IN], 758 DMA_FROM_DEVICE); 759 if (prot_count) 760 iser_dma_unmap_task_data(iser_task, 761 &iser_task->prot[ISER_DIR_IN], 762 DMA_FROM_DEVICE); 763 } 764 765 if (iser_task->dir[ISER_DIR_OUT]) { 766 iser_unreg_rdma_mem(iser_task, ISER_DIR_OUT); 767 iser_dma_unmap_task_data(iser_task, 768 &iser_task->data[ISER_DIR_OUT], 769 DMA_TO_DEVICE); 770 if (prot_count) 771 iser_dma_unmap_task_data(iser_task, 772 &iser_task->prot[ISER_DIR_OUT], 773 DMA_TO_DEVICE); 774 } 775 } 776