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 static 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->login_buf) { 224 ib_dma_unmap_single(device->ib_device, ib_conn->login_dma, 225 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 226 kfree(ib_conn->login_buf); 227 } 228 229 if (!ib_conn->rx_descs) 230 return; 231 232 rx_desc = ib_conn->rx_descs; 233 for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++) 234 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, 235 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 236 kfree(ib_conn->rx_descs); 237 } 238 239 /** 240 * iser_conn_set_full_featured_mode - (iSER API) 241 */ 242 int iser_conn_set_full_featured_mode(struct iscsi_conn *conn) 243 { 244 struct iscsi_iser_conn *iser_conn = conn->dd_data; 245 246 iser_dbg("Initially post: %d\n", ISER_MIN_POSTED_RX); 247 248 /* Check that there is no posted recv or send buffers left - */ 249 /* they must be consumed during the login phase */ 250 BUG_ON(iser_conn->ib_conn->post_recv_buf_count != 0); 251 BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0); 252 253 if (iser_alloc_rx_descriptors(iser_conn->ib_conn)) 254 return -ENOMEM; 255 256 /* Initial post receive buffers */ 257 if (iser_post_recvm(iser_conn->ib_conn, ISER_MIN_POSTED_RX)) 258 return -ENOMEM; 259 260 return 0; 261 } 262 263 /** 264 * iser_send_command - send command PDU 265 */ 266 int iser_send_command(struct iscsi_conn *conn, 267 struct iscsi_task *task) 268 { 269 struct iscsi_iser_conn *iser_conn = conn->dd_data; 270 struct iscsi_iser_task *iser_task = task->dd_data; 271 unsigned long edtl; 272 int err; 273 struct iser_data_buf *data_buf; 274 struct iscsi_cmd *hdr = (struct iscsi_cmd *)task->hdr; 275 struct scsi_cmnd *sc = task->sc; 276 struct iser_tx_desc *tx_desc = &iser_task->desc; 277 278 edtl = ntohl(hdr->data_length); 279 280 /* build the tx desc regd header and add it to the tx desc dto */ 281 tx_desc->type = ISCSI_TX_SCSI_COMMAND; 282 iser_create_send_desc(iser_conn->ib_conn, tx_desc); 283 284 if (hdr->flags & ISCSI_FLAG_CMD_READ) 285 data_buf = &iser_task->data[ISER_DIR_IN]; 286 else 287 data_buf = &iser_task->data[ISER_DIR_OUT]; 288 289 if (scsi_sg_count(sc)) { /* using a scatter list */ 290 data_buf->buf = scsi_sglist(sc); 291 data_buf->size = scsi_sg_count(sc); 292 } 293 294 data_buf->data_len = scsi_bufflen(sc); 295 296 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 297 err = iser_prepare_read_cmd(task, edtl); 298 if (err) 299 goto send_command_error; 300 } 301 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { 302 err = iser_prepare_write_cmd(task, 303 task->imm_count, 304 task->imm_count + 305 task->unsol_r2t.data_length, 306 edtl); 307 if (err) 308 goto send_command_error; 309 } 310 311 iser_task->status = ISER_TASK_STATUS_STARTED; 312 313 err = iser_post_send(iser_conn->ib_conn, tx_desc); 314 if (!err) 315 return 0; 316 317 send_command_error: 318 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); 319 return err; 320 } 321 322 /** 323 * iser_send_data_out - send data out PDU 324 */ 325 int iser_send_data_out(struct iscsi_conn *conn, 326 struct iscsi_task *task, 327 struct iscsi_data *hdr) 328 { 329 struct iscsi_iser_conn *iser_conn = conn->dd_data; 330 struct iscsi_iser_task *iser_task = task->dd_data; 331 struct iser_tx_desc *tx_desc = NULL; 332 struct iser_regd_buf *regd_buf; 333 unsigned long buf_offset; 334 unsigned long data_seg_len; 335 uint32_t itt; 336 int err = 0; 337 struct ib_sge *tx_dsg; 338 339 itt = (__force uint32_t)hdr->itt; 340 data_seg_len = ntoh24(hdr->dlength); 341 buf_offset = ntohl(hdr->offset); 342 343 iser_dbg("%s itt %d dseg_len %d offset %d\n", 344 __func__,(int)itt,(int)data_seg_len,(int)buf_offset); 345 346 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); 347 if (tx_desc == NULL) { 348 iser_err("Failed to alloc desc for post dataout\n"); 349 return -ENOMEM; 350 } 351 352 tx_desc->type = ISCSI_TX_DATAOUT; 353 tx_desc->iser_header.flags = ISER_VER; 354 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); 355 356 /* build the tx desc */ 357 iser_initialize_task_headers(task, tx_desc); 358 359 regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; 360 tx_dsg = &tx_desc->tx_sg[1]; 361 tx_dsg->addr = regd_buf->reg.va + buf_offset; 362 tx_dsg->length = data_seg_len; 363 tx_dsg->lkey = regd_buf->reg.lkey; 364 tx_desc->num_sge = 2; 365 366 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { 367 iser_err("Offset:%ld & DSL:%ld in Data-Out " 368 "inconsistent with total len:%ld, itt:%d\n", 369 buf_offset, data_seg_len, 370 iser_task->data[ISER_DIR_OUT].data_len, itt); 371 err = -EINVAL; 372 goto send_data_out_error; 373 } 374 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", 375 itt, buf_offset, data_seg_len); 376 377 378 err = iser_post_send(iser_conn->ib_conn, tx_desc); 379 if (!err) 380 return 0; 381 382 send_data_out_error: 383 kmem_cache_free(ig.desc_cache, tx_desc); 384 iser_err("conn %p failed err %d\n",conn, err); 385 return err; 386 } 387 388 int iser_send_control(struct iscsi_conn *conn, 389 struct iscsi_task *task) 390 { 391 struct iscsi_iser_conn *iser_conn = conn->dd_data; 392 struct iscsi_iser_task *iser_task = task->dd_data; 393 struct iser_tx_desc *mdesc = &iser_task->desc; 394 unsigned long data_seg_len; 395 int err = 0; 396 struct iser_device *device; 397 398 /* build the tx desc regd header and add it to the tx desc dto */ 399 mdesc->type = ISCSI_TX_CONTROL; 400 iser_create_send_desc(iser_conn->ib_conn, mdesc); 401 402 device = iser_conn->ib_conn->device; 403 404 data_seg_len = ntoh24(task->hdr->dlength); 405 406 if (data_seg_len > 0) { 407 struct ib_sge *tx_dsg = &mdesc->tx_sg[1]; 408 if (task != conn->login_task) { 409 iser_err("data present on non login task!!!\n"); 410 goto send_control_error; 411 } 412 memcpy(iser_conn->ib_conn->login_buf, task->data, 413 task->data_count); 414 tx_dsg->addr = iser_conn->ib_conn->login_dma; 415 tx_dsg->length = data_seg_len; 416 tx_dsg->lkey = device->mr->lkey; 417 mdesc->num_sge = 2; 418 } 419 420 if (task == conn->login_task) { 421 err = iser_post_recvl(iser_conn->ib_conn); 422 if (err) 423 goto send_control_error; 424 } 425 426 err = iser_post_send(iser_conn->ib_conn, mdesc); 427 if (!err) 428 return 0; 429 430 send_control_error: 431 iser_err("conn %p failed err %d\n",conn, err); 432 return err; 433 } 434 435 /** 436 * iser_rcv_dto_completion - recv DTO completion 437 */ 438 void iser_rcv_completion(struct iser_rx_desc *rx_desc, 439 unsigned long rx_xfer_len, 440 struct iser_conn *ib_conn) 441 { 442 struct iscsi_iser_conn *conn = ib_conn->iser_conn; 443 struct iscsi_hdr *hdr; 444 u64 rx_dma; 445 int rx_buflen, outstanding, count, err; 446 447 /* differentiate between login to all other PDUs */ 448 if ((char *)rx_desc == ib_conn->login_buf) { 449 rx_dma = ib_conn->login_dma; 450 rx_buflen = ISER_RX_LOGIN_SIZE; 451 } else { 452 rx_dma = rx_desc->dma_addr; 453 rx_buflen = ISER_RX_PAYLOAD_SIZE; 454 } 455 456 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma, 457 rx_buflen, DMA_FROM_DEVICE); 458 459 hdr = &rx_desc->iscsi_header; 460 461 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, 462 hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN)); 463 464 iscsi_iser_recv(conn->iscsi_conn, hdr, 465 rx_desc->data, rx_xfer_len - ISER_HEADERS_LEN); 466 467 ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma, 468 rx_buflen, DMA_FROM_DEVICE); 469 470 /* decrementing conn->post_recv_buf_count only --after-- freeing the * 471 * task eliminates the need to worry on tasks which are completed in * 472 * parallel to the execution of iser_conn_term. So the code that waits * 473 * for the posted rx bufs refcount to become zero handles everything */ 474 conn->ib_conn->post_recv_buf_count--; 475 476 if (rx_dma == ib_conn->login_dma) 477 return; 478 479 outstanding = ib_conn->post_recv_buf_count; 480 if (outstanding + ISER_MIN_POSTED_RX <= ISER_QP_MAX_RECV_DTOS) { 481 count = min(ISER_QP_MAX_RECV_DTOS - outstanding, 482 ISER_MIN_POSTED_RX); 483 err = iser_post_recvm(ib_conn, count); 484 if (err) 485 iser_err("posting %d rx bufs err %d\n", count, err); 486 } 487 } 488 489 void iser_snd_completion(struct iser_tx_desc *tx_desc, 490 struct iser_conn *ib_conn) 491 { 492 struct iscsi_task *task; 493 struct iser_device *device = ib_conn->device; 494 495 if (tx_desc->type == ISCSI_TX_DATAOUT) { 496 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr, 497 ISER_HEADERS_LEN, DMA_TO_DEVICE); 498 kmem_cache_free(ig.desc_cache, tx_desc); 499 } 500 501 atomic_dec(&ib_conn->post_send_buf_count); 502 503 if (tx_desc->type == ISCSI_TX_CONTROL) { 504 /* this arithmetic is legal by libiscsi dd_data allocation */ 505 task = (void *) ((long)(void *)tx_desc - 506 sizeof(struct iscsi_task)); 507 if (task->hdr->itt == RESERVED_ITT) 508 iscsi_put_task(task); 509 } 510 } 511 512 void iser_task_rdma_init(struct iscsi_iser_task *iser_task) 513 514 { 515 iser_task->status = ISER_TASK_STATUS_INIT; 516 517 iser_task->dir[ISER_DIR_IN] = 0; 518 iser_task->dir[ISER_DIR_OUT] = 0; 519 520 iser_task->data[ISER_DIR_IN].data_len = 0; 521 iser_task->data[ISER_DIR_OUT].data_len = 0; 522 523 memset(&iser_task->rdma_regd[ISER_DIR_IN], 0, 524 sizeof(struct iser_regd_buf)); 525 memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0, 526 sizeof(struct iser_regd_buf)); 527 } 528 529 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) 530 { 531 int is_rdma_aligned = 1; 532 struct iser_regd_buf *regd; 533 534 /* if we were reading, copy back to unaligned sglist, 535 * anyway dma_unmap and free the copy 536 */ 537 if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) { 538 is_rdma_aligned = 0; 539 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_IN); 540 } 541 if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) { 542 is_rdma_aligned = 0; 543 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_OUT); 544 } 545 546 if (iser_task->dir[ISER_DIR_IN]) { 547 regd = &iser_task->rdma_regd[ISER_DIR_IN]; 548 if (regd->reg.is_fmr) 549 iser_unreg_mem(®d->reg); 550 } 551 552 if (iser_task->dir[ISER_DIR_OUT]) { 553 regd = &iser_task->rdma_regd[ISER_DIR_OUT]; 554 if (regd->reg.is_fmr) 555 iser_unreg_mem(®d->reg); 556 } 557 558 /* if the data was unaligned, it was already unmapped and then copied */ 559 if (is_rdma_aligned) 560 iser_dma_unmap_task_data(iser_task); 561 } 562