1 /* 2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 #include <linux/kernel.h> 33 #include <linux/slab.h> 34 #include <linux/mm.h> 35 #include <linux/scatterlist.h> 36 #include <linux/kfifo.h> 37 #include <scsi/scsi_cmnd.h> 38 #include <scsi/scsi_host.h> 39 40 #include "iscsi_iser.h" 41 42 /* Register user buffer memory and initialize passive rdma 43 * dto descriptor. Total data size is stored in 44 * iser_task->data[ISER_DIR_IN].data_len 45 */ 46 static int iser_prepare_read_cmd(struct iscsi_task *task, 47 unsigned int edtl) 48 49 { 50 struct iscsi_iser_task *iser_task = task->dd_data; 51 struct iser_regd_buf *regd_buf; 52 int err; 53 struct iser_hdr *hdr = &iser_task->desc.iser_header; 54 struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN]; 55 56 err = iser_dma_map_task_data(iser_task, 57 buf_in, 58 ISER_DIR_IN, 59 DMA_FROM_DEVICE); 60 if (err) 61 return err; 62 63 if (edtl > iser_task->data[ISER_DIR_IN].data_len) { 64 iser_err("Total data length: %ld, less than EDTL: " 65 "%d, in READ cmd BHS itt: %d, conn: 0x%p\n", 66 iser_task->data[ISER_DIR_IN].data_len, edtl, 67 task->itt, iser_task->iser_conn); 68 return -EINVAL; 69 } 70 71 err = iser_reg_rdma_mem(iser_task,ISER_DIR_IN); 72 if (err) { 73 iser_err("Failed to set up Data-IN RDMA\n"); 74 return err; 75 } 76 regd_buf = &iser_task->rdma_regd[ISER_DIR_IN]; 77 78 hdr->flags |= ISER_RSV; 79 hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey); 80 hdr->read_va = cpu_to_be64(regd_buf->reg.va); 81 82 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n", 83 task->itt, regd_buf->reg.rkey, 84 (unsigned long long)regd_buf->reg.va); 85 86 return 0; 87 } 88 89 /* Register user buffer memory and initialize passive rdma 90 * dto descriptor. Total data size is stored in 91 * task->data[ISER_DIR_OUT].data_len 92 */ 93 static int 94 iser_prepare_write_cmd(struct iscsi_task *task, 95 unsigned int imm_sz, 96 unsigned int unsol_sz, 97 unsigned int edtl) 98 { 99 struct iscsi_iser_task *iser_task = task->dd_data; 100 struct iser_regd_buf *regd_buf; 101 int err; 102 struct iser_hdr *hdr = &iser_task->desc.iser_header; 103 struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT]; 104 struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1]; 105 106 err = iser_dma_map_task_data(iser_task, 107 buf_out, 108 ISER_DIR_OUT, 109 DMA_TO_DEVICE); 110 if (err) 111 return err; 112 113 if (edtl > iser_task->data[ISER_DIR_OUT].data_len) { 114 iser_err("Total data length: %ld, less than EDTL: %d, " 115 "in WRITE cmd BHS itt: %d, conn: 0x%p\n", 116 iser_task->data[ISER_DIR_OUT].data_len, 117 edtl, task->itt, task->conn); 118 return -EINVAL; 119 } 120 121 err = iser_reg_rdma_mem(iser_task,ISER_DIR_OUT); 122 if (err != 0) { 123 iser_err("Failed to register write cmd RDMA mem\n"); 124 return err; 125 } 126 127 regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; 128 129 if (unsol_sz < edtl) { 130 hdr->flags |= ISER_WSV; 131 hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey); 132 hdr->write_va = cpu_to_be64(regd_buf->reg.va + unsol_sz); 133 134 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X " 135 "VA:%#llX + unsol:%d\n", 136 task->itt, regd_buf->reg.rkey, 137 (unsigned long long)regd_buf->reg.va, unsol_sz); 138 } 139 140 if (imm_sz > 0) { 141 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n", 142 task->itt, imm_sz); 143 tx_dsg->addr = regd_buf->reg.va; 144 tx_dsg->length = imm_sz; 145 tx_dsg->lkey = regd_buf->reg.lkey; 146 iser_task->desc.num_sge = 2; 147 } 148 149 return 0; 150 } 151 152 /* creates a new tx descriptor and adds header regd buffer */ 153 static void iser_create_send_desc(struct iser_conn *ib_conn, 154 struct iser_tx_desc *tx_desc) 155 { 156 struct iser_device *device = ib_conn->device; 157 158 ib_dma_sync_single_for_cpu(device->ib_device, 159 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 160 161 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); 162 tx_desc->iser_header.flags = ISER_VER; 163 164 tx_desc->num_sge = 1; 165 166 if (tx_desc->tx_sg[0].lkey != device->mr->lkey) { 167 tx_desc->tx_sg[0].lkey = device->mr->lkey; 168 iser_dbg("sdesc %p lkey mismatch, fixing\n", tx_desc); 169 } 170 } 171 172 173 int iser_alloc_rx_descriptors(struct iser_conn *ib_conn) 174 { 175 int i, j; 176 u64 dma_addr; 177 struct iser_rx_desc *rx_desc; 178 struct ib_sge *rx_sg; 179 struct iser_device *device = ib_conn->device; 180 181 ib_conn->rx_descs = kmalloc(ISER_QP_MAX_RECV_DTOS * 182 sizeof(struct iser_rx_desc), GFP_KERNEL); 183 if (!ib_conn->rx_descs) 184 goto rx_desc_alloc_fail; 185 186 rx_desc = ib_conn->rx_descs; 187 188 for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++) { 189 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc, 190 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 191 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 192 goto rx_desc_dma_map_failed; 193 194 rx_desc->dma_addr = dma_addr; 195 196 rx_sg = &rx_desc->rx_sg; 197 rx_sg->addr = rx_desc->dma_addr; 198 rx_sg->length = ISER_RX_PAYLOAD_SIZE; 199 rx_sg->lkey = device->mr->lkey; 200 } 201 202 ib_conn->rx_desc_head = 0; 203 return 0; 204 205 rx_desc_dma_map_failed: 206 rx_desc = ib_conn->rx_descs; 207 for (j = 0; j < i; j++, rx_desc++) 208 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 209 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 210 kfree(ib_conn->rx_descs); 211 ib_conn->rx_descs = NULL; 212 rx_desc_alloc_fail: 213 iser_err("failed allocating rx descriptors / data buffers\n"); 214 return -ENOMEM; 215 } 216 217 void iser_free_rx_descriptors(struct iser_conn *ib_conn) 218 { 219 int i; 220 struct iser_rx_desc *rx_desc; 221 struct iser_device *device = ib_conn->device; 222 223 if (!ib_conn->rx_descs) 224 return; 225 226 rx_desc = ib_conn->rx_descs; 227 for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++) 228 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 229 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 230 kfree(ib_conn->rx_descs); 231 } 232 233 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req) 234 { 235 struct iscsi_iser_conn *iser_conn = conn->dd_data; 236 237 iser_dbg("req op %x flags %x\n", req->opcode, req->flags); 238 /* check if this is the last login - going to full feature phase */ 239 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE) 240 return 0; 241 242 /* 243 * Check that there is one posted recv buffer (for the last login 244 * response) and no posted send buffers left - they must have been 245 * consumed during previous login phases. 246 */ 247 WARN_ON(iser_conn->ib_conn->post_recv_buf_count != 1); 248 WARN_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0); 249 250 iser_dbg("Initially post: %d\n", ISER_MIN_POSTED_RX); 251 /* Initial post receive buffers */ 252 if (iser_post_recvm(iser_conn->ib_conn, ISER_MIN_POSTED_RX)) 253 return -ENOMEM; 254 255 return 0; 256 } 257 258 /** 259 * iser_send_command - send command PDU 260 */ 261 int iser_send_command(struct iscsi_conn *conn, 262 struct iscsi_task *task) 263 { 264 struct iscsi_iser_conn *iser_conn = conn->dd_data; 265 struct iscsi_iser_task *iser_task = task->dd_data; 266 unsigned long edtl; 267 int err; 268 struct iser_data_buf *data_buf; 269 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr; 270 struct scsi_cmnd *sc = task->sc; 271 struct iser_tx_desc *tx_desc = &iser_task->desc; 272 273 edtl = ntohl(hdr->data_length); 274 275 /* build the tx desc regd header and add it to the tx desc dto */ 276 tx_desc->type = ISCSI_TX_SCSI_COMMAND; 277 iser_create_send_desc(iser_conn->ib_conn, tx_desc); 278 279 if (hdr->flags & ISCSI_FLAG_CMD_READ) 280 data_buf = &iser_task->data[ISER_DIR_IN]; 281 else 282 data_buf = &iser_task->data[ISER_DIR_OUT]; 283 284 if (scsi_sg_count(sc)) { /* using a scatter list */ 285 data_buf->buf = scsi_sglist(sc); 286 data_buf->size = scsi_sg_count(sc); 287 } 288 289 data_buf->data_len = scsi_bufflen(sc); 290 291 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 292 err = iser_prepare_read_cmd(task, edtl); 293 if (err) 294 goto send_command_error; 295 } 296 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { 297 err = iser_prepare_write_cmd(task, 298 task->imm_count, 299 task->imm_count + 300 task->unsol_r2t.data_length, 301 edtl); 302 if (err) 303 goto send_command_error; 304 } 305 306 iser_task->status = ISER_TASK_STATUS_STARTED; 307 308 err = iser_post_send(iser_conn->ib_conn, tx_desc); 309 if (!err) 310 return 0; 311 312 send_command_error: 313 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); 314 return err; 315 } 316 317 /** 318 * iser_send_data_out - send data out PDU 319 */ 320 int iser_send_data_out(struct iscsi_conn *conn, 321 struct iscsi_task *task, 322 struct iscsi_data *hdr) 323 { 324 struct iscsi_iser_conn *iser_conn = conn->dd_data; 325 struct iscsi_iser_task *iser_task = task->dd_data; 326 struct iser_tx_desc *tx_desc = NULL; 327 struct iser_regd_buf *regd_buf; 328 unsigned long buf_offset; 329 unsigned long data_seg_len; 330 uint32_t itt; 331 int err = 0; 332 struct ib_sge *tx_dsg; 333 334 itt = (__force uint32_t)hdr->itt; 335 data_seg_len = ntoh24(hdr->dlength); 336 buf_offset = ntohl(hdr->offset); 337 338 iser_dbg("%s itt %d dseg_len %d offset %d\n", 339 __func__,(int)itt,(int)data_seg_len,(int)buf_offset); 340 341 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); 342 if (tx_desc == NULL) { 343 iser_err("Failed to alloc desc for post dataout\n"); 344 return -ENOMEM; 345 } 346 347 tx_desc->type = ISCSI_TX_DATAOUT; 348 tx_desc->iser_header.flags = ISER_VER; 349 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); 350 351 /* build the tx desc */ 352 iser_initialize_task_headers(task, tx_desc); 353 354 regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; 355 tx_dsg = &tx_desc->tx_sg[1]; 356 tx_dsg->addr = regd_buf->reg.va + buf_offset; 357 tx_dsg->length = data_seg_len; 358 tx_dsg->lkey = regd_buf->reg.lkey; 359 tx_desc->num_sge = 2; 360 361 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { 362 iser_err("Offset:%ld & DSL:%ld in Data-Out " 363 "inconsistent with total len:%ld, itt:%d\n", 364 buf_offset, data_seg_len, 365 iser_task->data[ISER_DIR_OUT].data_len, itt); 366 err = -EINVAL; 367 goto send_data_out_error; 368 } 369 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", 370 itt, buf_offset, data_seg_len); 371 372 373 err = iser_post_send(iser_conn->ib_conn, tx_desc); 374 if (!err) 375 return 0; 376 377 send_data_out_error: 378 kmem_cache_free(ig.desc_cache, tx_desc); 379 iser_err("conn %p failed err %d\n",conn, err); 380 return err; 381 } 382 383 int iser_send_control(struct iscsi_conn *conn, 384 struct iscsi_task *task) 385 { 386 struct iscsi_iser_conn *iser_conn = conn->dd_data; 387 struct iscsi_iser_task *iser_task = task->dd_data; 388 struct iser_tx_desc *mdesc = &iser_task->desc; 389 unsigned long data_seg_len; 390 int err = 0; 391 struct iser_device *device; 392 struct iser_conn *ib_conn = iser_conn->ib_conn; 393 394 /* build the tx desc regd header and add it to the tx desc dto */ 395 mdesc->type = ISCSI_TX_CONTROL; 396 iser_create_send_desc(iser_conn->ib_conn, mdesc); 397 398 device = iser_conn->ib_conn->device; 399 400 data_seg_len = ntoh24(task->hdr->dlength); 401 402 if (data_seg_len > 0) { 403 struct ib_sge *tx_dsg = &mdesc->tx_sg[1]; 404 if (task != conn->login_task) { 405 iser_err("data present on non login task!!!\n"); 406 goto send_control_error; 407 } 408 409 ib_dma_sync_single_for_cpu(device->ib_device, 410 ib_conn->login_req_dma, task->data_count, 411 DMA_TO_DEVICE); 412 413 memcpy(iser_conn->ib_conn->login_req_buf, task->data, 414 task->data_count); 415 416 ib_dma_sync_single_for_device(device->ib_device, 417 ib_conn->login_req_dma, task->data_count, 418 DMA_TO_DEVICE); 419 420 tx_dsg->addr = iser_conn->ib_conn->login_req_dma; 421 tx_dsg->length = task->data_count; 422 tx_dsg->lkey = device->mr->lkey; 423 mdesc->num_sge = 2; 424 } 425 426 if (task == conn->login_task) { 427 err = iser_post_recvl(iser_conn->ib_conn); 428 if (err) 429 goto send_control_error; 430 err = iser_post_rx_bufs(conn, task->hdr); 431 if (err) 432 goto send_control_error; 433 } 434 435 err = iser_post_send(iser_conn->ib_conn, mdesc); 436 if (!err) 437 return 0; 438 439 send_control_error: 440 iser_err("conn %p failed err %d\n",conn, err); 441 return err; 442 } 443 444 /** 445 * iser_rcv_dto_completion - recv DTO completion 446 */ 447 void iser_rcv_completion(struct iser_rx_desc *rx_desc, 448 unsigned long rx_xfer_len, 449 struct iser_conn *ib_conn) 450 { 451 struct iscsi_iser_conn *conn = ib_conn->iser_conn; 452 struct iscsi_hdr *hdr; 453 u64 rx_dma; 454 int rx_buflen, outstanding, count, err; 455 456 /* differentiate between login to all other PDUs */ 457 if ((char *)rx_desc == ib_conn->login_resp_buf) { 458 rx_dma = ib_conn->login_resp_dma; 459 rx_buflen = ISER_RX_LOGIN_SIZE; 460 } else { 461 rx_dma = rx_desc->dma_addr; 462 rx_buflen = ISER_RX_PAYLOAD_SIZE; 463 } 464 465 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma, 466 rx_buflen, DMA_FROM_DEVICE); 467 468 hdr = &rx_desc->iscsi_header; 469 470 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 471 hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN)); 472 473 iscsi_iser_recv(conn->iscsi_conn, hdr, 474 rx_desc->data, rx_xfer_len - ISER_HEADERS_LEN); 475 476 ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma, 477 rx_buflen, DMA_FROM_DEVICE); 478 479 /* decrementing conn->post_recv_buf_count only --after-- freeing the * 480 * task eliminates the need to worry on tasks which are completed in * 481 * parallel to the execution of iser_conn_term. So the code that waits * 482 * for the posted rx bufs refcount to become zero handles everything */ 483 conn->ib_conn->post_recv_buf_count--; 484 485 if (rx_dma == ib_conn->login_resp_dma) 486 return; 487 488 outstanding = ib_conn->post_recv_buf_count; 489 if (outstanding + ISER_MIN_POSTED_RX <= ISER_QP_MAX_RECV_DTOS) { 490 count = min(ISER_QP_MAX_RECV_DTOS - outstanding, 491 ISER_MIN_POSTED_RX); 492 err = iser_post_recvm(ib_conn, count); 493 if (err) 494 iser_err("posting %d rx bufs err %d\n", count, err); 495 } 496 } 497 498 void iser_snd_completion(struct iser_tx_desc *tx_desc, 499 struct iser_conn *ib_conn) 500 { 501 struct iscsi_task *task; 502 struct iser_device *device = ib_conn->device; 503 504 if (tx_desc->type == ISCSI_TX_DATAOUT) { 505 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr, 506 ISER_HEADERS_LEN, DMA_TO_DEVICE); 507 kmem_cache_free(ig.desc_cache, tx_desc); 508 } 509 510 atomic_dec(&ib_conn->post_send_buf_count); 511 512 if (tx_desc->type == ISCSI_TX_CONTROL) { 513 /* this arithmetic is legal by libiscsi dd_data allocation */ 514 task = (void *) ((long)(void *)tx_desc - 515 sizeof(struct iscsi_task)); 516 if (task->hdr->itt == RESERVED_ITT) 517 iscsi_put_task(task); 518 } 519 } 520 521 void iser_task_rdma_init(struct iscsi_iser_task *iser_task) 522 523 { 524 iser_task->status = ISER_TASK_STATUS_INIT; 525 526 iser_task->dir[ISER_DIR_IN] = 0; 527 iser_task->dir[ISER_DIR_OUT] = 0; 528 529 iser_task->data[ISER_DIR_IN].data_len = 0; 530 iser_task->data[ISER_DIR_OUT].data_len = 0; 531 532 memset(&iser_task->rdma_regd[ISER_DIR_IN], 0, 533 sizeof(struct iser_regd_buf)); 534 memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0, 535 sizeof(struct iser_regd_buf)); 536 } 537 538 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) 539 { 540 int is_rdma_aligned = 1; 541 struct iser_regd_buf *regd; 542 543 /* if we were reading, copy back to unaligned sglist, 544 * anyway dma_unmap and free the copy 545 */ 546 if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) { 547 is_rdma_aligned = 0; 548 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_IN); 549 } 550 if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) { 551 is_rdma_aligned = 0; 552 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_OUT); 553 } 554 555 if (iser_task->dir[ISER_DIR_IN]) { 556 regd = &iser_task->rdma_regd[ISER_DIR_IN]; 557 if (regd->reg.is_fmr) 558 iser_unreg_mem(®d->reg); 559 } 560 561 if (iser_task->dir[ISER_DIR_OUT]) { 562 regd = &iser_task->rdma_regd[ISER_DIR_OUT]; 563 if (regd->reg.is_fmr) 564 iser_unreg_mem(®d->reg); 565 } 566 567 /* if the data was unaligned, it was already unmapped and then copied */ 568 if (is_rdma_aligned) 569 iser_dma_unmap_task_data(iser_task); 570 } 571