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 " 146 "VA:%#llX + unsol:%d\n", 147 task->itt, mem_reg->rkey, 148 (unsigned long long)mem_reg->sge.addr, unsol_sz); 149 } 150 151 if (imm_sz > 0) { 152 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n", 153 task->itt, imm_sz); 154 tx_dsg->addr = mem_reg->sge.addr; 155 tx_dsg->length = imm_sz; 156 tx_dsg->lkey = mem_reg->sge.lkey; 157 iser_task->desc.num_sge = 2; 158 } 159 160 return 0; 161 } 162 163 /* creates a new tx descriptor and adds header regd buffer */ 164 static void iser_create_send_desc(struct iser_conn *iser_conn, 165 struct iser_tx_desc *tx_desc) 166 { 167 struct iser_device *device = iser_conn->ib_conn.device; 168 169 ib_dma_sync_single_for_cpu(device->ib_device, 170 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 171 172 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl)); 173 tx_desc->iser_header.flags = ISER_VER; 174 tx_desc->num_sge = 1; 175 } 176 177 static void iser_free_login_buf(struct iser_conn *iser_conn) 178 { 179 struct iser_device *device = iser_conn->ib_conn.device; 180 struct iser_login_desc *desc = &iser_conn->login_desc; 181 182 if (!desc->req) 183 return; 184 185 ib_dma_unmap_single(device->ib_device, desc->req_dma, 186 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 187 188 ib_dma_unmap_single(device->ib_device, desc->rsp_dma, 189 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 190 191 kfree(desc->req); 192 kfree(desc->rsp); 193 194 /* make sure we never redo any unmapping */ 195 desc->req = NULL; 196 desc->rsp = NULL; 197 } 198 199 static int iser_alloc_login_buf(struct iser_conn *iser_conn) 200 { 201 struct iser_device *device = iser_conn->ib_conn.device; 202 struct iser_login_desc *desc = &iser_conn->login_desc; 203 204 desc->req = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL); 205 if (!desc->req) 206 return -ENOMEM; 207 208 desc->req_dma = ib_dma_map_single(device->ib_device, desc->req, 209 ISCSI_DEF_MAX_RECV_SEG_LEN, 210 DMA_TO_DEVICE); 211 if (ib_dma_mapping_error(device->ib_device, 212 desc->req_dma)) 213 goto free_req; 214 215 desc->rsp = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL); 216 if (!desc->rsp) 217 goto unmap_req; 218 219 desc->rsp_dma = ib_dma_map_single(device->ib_device, desc->rsp, 220 ISER_RX_LOGIN_SIZE, 221 DMA_FROM_DEVICE); 222 if (ib_dma_mapping_error(device->ib_device, 223 desc->rsp_dma)) 224 goto free_rsp; 225 226 return 0; 227 228 free_rsp: 229 kfree(desc->rsp); 230 unmap_req: 231 ib_dma_unmap_single(device->ib_device, desc->req_dma, 232 ISCSI_DEF_MAX_RECV_SEG_LEN, 233 DMA_TO_DEVICE); 234 free_req: 235 kfree(desc->req); 236 237 return -ENOMEM; 238 } 239 240 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, 241 struct iscsi_session *session) 242 { 243 int i, j; 244 u64 dma_addr; 245 struct iser_rx_desc *rx_desc; 246 struct ib_sge *rx_sg; 247 struct ib_conn *ib_conn = &iser_conn->ib_conn; 248 struct iser_device *device = ib_conn->device; 249 250 iser_conn->qp_max_recv_dtos = session->cmds_max; 251 iser_conn->qp_max_recv_dtos_mask = session->cmds_max - 1; /* cmds_max is 2^N */ 252 iser_conn->min_posted_rx = iser_conn->qp_max_recv_dtos >> 2; 253 254 if (device->reg_ops->alloc_reg_res(ib_conn, session->scsi_cmds_max, 255 iser_conn->scsi_sg_tablesize)) 256 goto create_rdma_reg_res_failed; 257 258 if (iser_alloc_login_buf(iser_conn)) 259 goto alloc_login_buf_fail; 260 261 iser_conn->num_rx_descs = session->cmds_max; 262 iser_conn->rx_descs = kmalloc(iser_conn->num_rx_descs * 263 sizeof(struct iser_rx_desc), 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 device->reg_ops->free_reg_res(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 if (device->reg_ops->free_reg_res) 310 device->reg_ops->free_reg_res(ib_conn); 311 312 rx_desc = iser_conn->rx_descs; 313 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) 314 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 315 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 316 kfree(iser_conn->rx_descs); 317 /* make sure we never redo any unmapping */ 318 iser_conn->rx_descs = NULL; 319 320 iser_free_login_buf(iser_conn); 321 } 322 323 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req) 324 { 325 struct iser_conn *iser_conn = conn->dd_data; 326 struct ib_conn *ib_conn = &iser_conn->ib_conn; 327 struct iscsi_session *session = conn->session; 328 329 iser_dbg("req op %x flags %x\n", req->opcode, req->flags); 330 /* check if this is the last login - going to full feature phase */ 331 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE) 332 return 0; 333 334 /* 335 * Check that there is one posted recv buffer 336 * (for the last login response). 337 */ 338 WARN_ON(ib_conn->post_recv_buf_count != 1); 339 340 if (session->discovery_sess) { 341 iser_info("Discovery session, re-using login RX buffer\n"); 342 return 0; 343 } else 344 iser_info("Normal session, posting batch of RX %d buffers\n", 345 iser_conn->min_posted_rx); 346 347 /* Initial post receive buffers */ 348 if (iser_post_recvm(iser_conn, iser_conn->min_posted_rx)) 349 return -ENOMEM; 350 351 return 0; 352 } 353 354 static inline bool iser_signal_comp(u8 sig_count) 355 { 356 return ((sig_count % ISER_SIGNAL_CMD_COUNT) == 0); 357 } 358 359 /** 360 * iser_send_command - send command PDU 361 */ 362 int iser_send_command(struct iscsi_conn *conn, 363 struct iscsi_task *task) 364 { 365 struct iser_conn *iser_conn = conn->dd_data; 366 struct iscsi_iser_task *iser_task = task->dd_data; 367 unsigned long edtl; 368 int err; 369 struct iser_data_buf *data_buf, *prot_buf; 370 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr; 371 struct scsi_cmnd *sc = task->sc; 372 struct iser_tx_desc *tx_desc = &iser_task->desc; 373 u8 sig_count = ++iser_conn->ib_conn.sig_count; 374 375 edtl = ntohl(hdr->data_length); 376 377 /* build the tx desc regd header and add it to the tx desc dto */ 378 tx_desc->type = ISCSI_TX_SCSI_COMMAND; 379 tx_desc->cqe.done = iser_cmd_comp; 380 iser_create_send_desc(iser_conn, tx_desc); 381 382 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 383 data_buf = &iser_task->data[ISER_DIR_IN]; 384 prot_buf = &iser_task->prot[ISER_DIR_IN]; 385 } else { 386 data_buf = &iser_task->data[ISER_DIR_OUT]; 387 prot_buf = &iser_task->prot[ISER_DIR_OUT]; 388 } 389 390 if (scsi_sg_count(sc)) { /* using a scatter list */ 391 data_buf->sg = scsi_sglist(sc); 392 data_buf->size = scsi_sg_count(sc); 393 } 394 data_buf->data_len = scsi_bufflen(sc); 395 396 if (scsi_prot_sg_count(sc)) { 397 prot_buf->sg = scsi_prot_sglist(sc); 398 prot_buf->size = scsi_prot_sg_count(sc); 399 prot_buf->data_len = (data_buf->data_len >> 400 ilog2(sc->device->sector_size)) * 8; 401 } 402 403 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 404 err = iser_prepare_read_cmd(task); 405 if (err) 406 goto send_command_error; 407 } 408 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { 409 err = iser_prepare_write_cmd(task, 410 task->imm_count, 411 task->imm_count + 412 task->unsol_r2t.data_length, 413 edtl); 414 if (err) 415 goto send_command_error; 416 } 417 418 iser_task->status = ISER_TASK_STATUS_STARTED; 419 420 err = iser_post_send(&iser_conn->ib_conn, tx_desc, 421 iser_signal_comp(sig_count)); 422 if (!err) 423 return 0; 424 425 send_command_error: 426 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); 427 return err; 428 } 429 430 /** 431 * iser_send_data_out - send data out PDU 432 */ 433 int iser_send_data_out(struct iscsi_conn *conn, 434 struct iscsi_task *task, 435 struct iscsi_data *hdr) 436 { 437 struct iser_conn *iser_conn = conn->dd_data; 438 struct iscsi_iser_task *iser_task = task->dd_data; 439 struct iser_tx_desc *tx_desc = NULL; 440 struct iser_mem_reg *mem_reg; 441 unsigned long buf_offset; 442 unsigned long data_seg_len; 443 uint32_t itt; 444 int err; 445 struct ib_sge *tx_dsg; 446 447 itt = (__force uint32_t)hdr->itt; 448 data_seg_len = ntoh24(hdr->dlength); 449 buf_offset = ntohl(hdr->offset); 450 451 iser_dbg("%s itt %d dseg_len %d offset %d\n", 452 __func__,(int)itt,(int)data_seg_len,(int)buf_offset); 453 454 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); 455 if (tx_desc == NULL) { 456 iser_err("Failed to alloc desc for post dataout\n"); 457 return -ENOMEM; 458 } 459 460 tx_desc->type = ISCSI_TX_DATAOUT; 461 tx_desc->cqe.done = iser_dataout_comp; 462 tx_desc->iser_header.flags = ISER_VER; 463 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); 464 465 /* build the tx desc */ 466 err = iser_initialize_task_headers(task, tx_desc); 467 if (err) 468 goto send_data_out_error; 469 470 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT]; 471 tx_dsg = &tx_desc->tx_sg[1]; 472 tx_dsg->addr = mem_reg->sge.addr + buf_offset; 473 tx_dsg->length = data_seg_len; 474 tx_dsg->lkey = mem_reg->sge.lkey; 475 tx_desc->num_sge = 2; 476 477 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { 478 iser_err("Offset:%ld & DSL:%ld in Data-Out " 479 "inconsistent with total len:%ld, itt:%d\n", 480 buf_offset, data_seg_len, 481 iser_task->data[ISER_DIR_OUT].data_len, itt); 482 err = -EINVAL; 483 goto send_data_out_error; 484 } 485 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", 486 itt, buf_offset, data_seg_len); 487 488 489 err = iser_post_send(&iser_conn->ib_conn, tx_desc, true); 490 if (!err) 491 return 0; 492 493 send_data_out_error: 494 kmem_cache_free(ig.desc_cache, tx_desc); 495 iser_err("conn %p failed err %d\n", conn, err); 496 return err; 497 } 498 499 int iser_send_control(struct iscsi_conn *conn, 500 struct iscsi_task *task) 501 { 502 struct iser_conn *iser_conn = conn->dd_data; 503 struct iscsi_iser_task *iser_task = task->dd_data; 504 struct iser_tx_desc *mdesc = &iser_task->desc; 505 unsigned long data_seg_len; 506 int err = 0; 507 struct iser_device *device; 508 509 /* build the tx desc regd header and add it to the tx desc dto */ 510 mdesc->type = ISCSI_TX_CONTROL; 511 mdesc->cqe.done = iser_ctrl_comp; 512 iser_create_send_desc(iser_conn, mdesc); 513 514 device = iser_conn->ib_conn.device; 515 516 data_seg_len = ntoh24(task->hdr->dlength); 517 518 if (data_seg_len > 0) { 519 struct iser_login_desc *desc = &iser_conn->login_desc; 520 struct ib_sge *tx_dsg = &mdesc->tx_sg[1]; 521 522 if (task != conn->login_task) { 523 iser_err("data present on non login task!!!\n"); 524 goto send_control_error; 525 } 526 527 ib_dma_sync_single_for_cpu(device->ib_device, desc->req_dma, 528 task->data_count, DMA_TO_DEVICE); 529 530 memcpy(desc->req, task->data, task->data_count); 531 532 ib_dma_sync_single_for_device(device->ib_device, desc->req_dma, 533 task->data_count, DMA_TO_DEVICE); 534 535 tx_dsg->addr = desc->req_dma; 536 tx_dsg->length = task->data_count; 537 tx_dsg->lkey = device->pd->local_dma_lkey; 538 mdesc->num_sge = 2; 539 } 540 541 if (task == conn->login_task) { 542 iser_dbg("op %x dsl %lx, posting login rx buffer\n", 543 task->hdr->opcode, data_seg_len); 544 err = iser_post_recvl(iser_conn); 545 if (err) 546 goto send_control_error; 547 err = iser_post_rx_bufs(conn, task->hdr); 548 if (err) 549 goto send_control_error; 550 } 551 552 err = iser_post_send(&iser_conn->ib_conn, mdesc, true); 553 if (!err) 554 return 0; 555 556 send_control_error: 557 iser_err("conn %p failed err %d\n",conn, err); 558 return err; 559 } 560 561 void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc) 562 { 563 struct ib_conn *ib_conn = wc->qp->qp_context; 564 struct iser_conn *iser_conn = to_iser_conn(ib_conn); 565 struct iser_login_desc *desc = iser_login(wc->wr_cqe); 566 struct iscsi_hdr *hdr; 567 char *data; 568 int length; 569 570 if (unlikely(wc->status != IB_WC_SUCCESS)) { 571 iser_err_comp(wc, "login_rsp"); 572 return; 573 } 574 575 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, 576 desc->rsp_dma, ISER_RX_LOGIN_SIZE, 577 DMA_FROM_DEVICE); 578 579 hdr = desc->rsp + sizeof(struct iser_ctrl); 580 data = desc->rsp + ISER_HEADERS_LEN; 581 length = wc->byte_len - ISER_HEADERS_LEN; 582 583 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 584 hdr->itt, length); 585 586 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, data, length); 587 588 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 589 desc->rsp_dma, ISER_RX_LOGIN_SIZE, 590 DMA_FROM_DEVICE); 591 592 ib_conn->post_recv_buf_count--; 593 } 594 595 static inline void 596 iser_inv_desc(struct iser_fr_desc *desc, u32 rkey) 597 { 598 if (likely(rkey == desc->rsc.mr->rkey)) 599 desc->rsc.mr_valid = 0; 600 else if (likely(rkey == desc->pi_ctx->sig_mr->rkey)) 601 desc->pi_ctx->sig_mr_valid = 0; 602 } 603 604 static int 605 iser_check_remote_inv(struct iser_conn *iser_conn, 606 struct ib_wc *wc, 607 struct iscsi_hdr *hdr) 608 { 609 if (wc->wc_flags & IB_WC_WITH_INVALIDATE) { 610 struct iscsi_task *task; 611 u32 rkey = wc->ex.invalidate_rkey; 612 613 iser_dbg("conn %p: remote invalidation for rkey %#x\n", 614 iser_conn, rkey); 615 616 if (unlikely(!iser_conn->snd_w_inv)) { 617 iser_err("conn %p: unexpected remote invalidation, " 618 "terminating connection\n", iser_conn); 619 return -EPROTO; 620 } 621 622 task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt); 623 if (likely(task)) { 624 struct iscsi_iser_task *iser_task = task->dd_data; 625 struct iser_fr_desc *desc; 626 627 if (iser_task->dir[ISER_DIR_IN]) { 628 desc = iser_task->rdma_reg[ISER_DIR_IN].mem_h; 629 iser_inv_desc(desc, rkey); 630 } 631 632 if (iser_task->dir[ISER_DIR_OUT]) { 633 desc = iser_task->rdma_reg[ISER_DIR_OUT].mem_h; 634 iser_inv_desc(desc, rkey); 635 } 636 } else { 637 iser_err("failed to get task for itt=%d\n", hdr->itt); 638 return -EINVAL; 639 } 640 } 641 642 return 0; 643 } 644 645 646 void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc) 647 { 648 struct ib_conn *ib_conn = wc->qp->qp_context; 649 struct iser_conn *iser_conn = to_iser_conn(ib_conn); 650 struct iser_rx_desc *desc = iser_rx(wc->wr_cqe); 651 struct iscsi_hdr *hdr; 652 int length; 653 int outstanding, count, err; 654 655 if (unlikely(wc->status != IB_WC_SUCCESS)) { 656 iser_err_comp(wc, "task_rsp"); 657 return; 658 } 659 660 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, 661 desc->dma_addr, ISER_RX_PAYLOAD_SIZE, 662 DMA_FROM_DEVICE); 663 664 hdr = &desc->iscsi_header; 665 length = wc->byte_len - ISER_HEADERS_LEN; 666 667 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 668 hdr->itt, length); 669 670 if (iser_check_remote_inv(iser_conn, wc, hdr)) { 671 iscsi_conn_failure(iser_conn->iscsi_conn, 672 ISCSI_ERR_CONN_FAILED); 673 return; 674 } 675 676 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length); 677 678 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 679 desc->dma_addr, ISER_RX_PAYLOAD_SIZE, 680 DMA_FROM_DEVICE); 681 682 /* decrementing conn->post_recv_buf_count only --after-- freeing the * 683 * task eliminates the need to worry on tasks which are completed in * 684 * parallel to the execution of iser_conn_term. So the code that waits * 685 * for the posted rx bufs refcount to become zero handles everything */ 686 ib_conn->post_recv_buf_count--; 687 688 outstanding = ib_conn->post_recv_buf_count; 689 if (outstanding + iser_conn->min_posted_rx <= iser_conn->qp_max_recv_dtos) { 690 count = min(iser_conn->qp_max_recv_dtos - outstanding, 691 iser_conn->min_posted_rx); 692 err = iser_post_recvm(iser_conn, count); 693 if (err) 694 iser_err("posting %d rx bufs err %d\n", count, err); 695 } 696 } 697 698 void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc) 699 { 700 if (unlikely(wc->status != IB_WC_SUCCESS)) 701 iser_err_comp(wc, "command"); 702 } 703 704 void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc) 705 { 706 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe); 707 struct iscsi_task *task; 708 709 if (unlikely(wc->status != IB_WC_SUCCESS)) { 710 iser_err_comp(wc, "control"); 711 return; 712 } 713 714 /* this arithmetic is legal by libiscsi dd_data allocation */ 715 task = (void *)desc - sizeof(struct iscsi_task); 716 if (task->hdr->itt == RESERVED_ITT) 717 iscsi_put_task(task); 718 } 719 720 void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc) 721 { 722 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe); 723 struct ib_conn *ib_conn = wc->qp->qp_context; 724 struct iser_device *device = ib_conn->device; 725 726 if (unlikely(wc->status != IB_WC_SUCCESS)) 727 iser_err_comp(wc, "dataout"); 728 729 ib_dma_unmap_single(device->ib_device, desc->dma_addr, 730 ISER_HEADERS_LEN, DMA_TO_DEVICE); 731 kmem_cache_free(ig.desc_cache, desc); 732 } 733 734 void iser_task_rdma_init(struct iscsi_iser_task *iser_task) 735 736 { 737 iser_task->status = ISER_TASK_STATUS_INIT; 738 739 iser_task->dir[ISER_DIR_IN] = 0; 740 iser_task->dir[ISER_DIR_OUT] = 0; 741 742 iser_task->data[ISER_DIR_IN].data_len = 0; 743 iser_task->data[ISER_DIR_OUT].data_len = 0; 744 745 iser_task->prot[ISER_DIR_IN].data_len = 0; 746 iser_task->prot[ISER_DIR_OUT].data_len = 0; 747 748 memset(&iser_task->rdma_reg[ISER_DIR_IN], 0, 749 sizeof(struct iser_mem_reg)); 750 memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0, 751 sizeof(struct iser_mem_reg)); 752 } 753 754 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) 755 { 756 int prot_count = scsi_prot_sg_count(iser_task->sc); 757 758 if (iser_task->dir[ISER_DIR_IN]) { 759 iser_unreg_rdma_mem(iser_task, ISER_DIR_IN); 760 iser_dma_unmap_task_data(iser_task, 761 &iser_task->data[ISER_DIR_IN], 762 DMA_FROM_DEVICE); 763 if (prot_count) 764 iser_dma_unmap_task_data(iser_task, 765 &iser_task->prot[ISER_DIR_IN], 766 DMA_FROM_DEVICE); 767 } 768 769 if (iser_task->dir[ISER_DIR_OUT]) { 770 iser_unreg_rdma_mem(iser_task, ISER_DIR_OUT); 771 iser_dma_unmap_task_data(iser_task, 772 &iser_task->data[ISER_DIR_OUT], 773 DMA_TO_DEVICE); 774 if (prot_count) 775 iser_dma_unmap_task_data(iser_task, 776 &iser_task->prot[ISER_DIR_OUT], 777 DMA_TO_DEVICE); 778 } 779 } 780