1 /* 2 * iSCSI Initiator over iSER Data-Path 3 * 4 * Copyright (C) 2004 Dmitry Yusupov 5 * Copyright (C) 2004 Alex Aizman 6 * Copyright (C) 2005 Mike Christie 7 * Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved. 8 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved. 9 * maintained by openib-general@openib.org 10 * 11 * This software is available to you under a choice of one of two 12 * licenses. You may choose to be licensed under the terms of the GNU 13 * General Public License (GPL) Version 2, available from the file 14 * COPYING in the main directory of this source tree, or the 15 * OpenIB.org BSD license below: 16 * 17 * Redistribution and use in source and binary forms, with or 18 * without modification, are permitted provided that the following 19 * conditions are met: 20 * 21 * - Redistributions of source code must retain the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer. 24 * 25 * - Redistributions in binary form must reproduce the above 26 * copyright notice, this list of conditions and the following 27 * disclaimer in the documentation and/or other materials 28 * provided with the distribution. 29 * 30 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 31 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 32 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 33 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 34 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 35 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 36 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 37 * SOFTWARE. 38 * 39 * Credits: 40 * Christoph Hellwig 41 * FUJITA Tomonori 42 * Arne Redlich 43 * Zhenyu Wang 44 * Modified by: 45 * Erez Zilber 46 */ 47 48 #include <linux/types.h> 49 #include <linux/list.h> 50 #include <linux/hardirq.h> 51 #include <linux/kfifo.h> 52 #include <linux/blkdev.h> 53 #include <linux/init.h> 54 #include <linux/ioctl.h> 55 #include <linux/cdev.h> 56 #include <linux/in.h> 57 #include <linux/net.h> 58 #include <linux/scatterlist.h> 59 #include <linux/delay.h> 60 #include <linux/slab.h> 61 #include <linux/module.h> 62 63 #include <net/sock.h> 64 65 #include <asm/uaccess.h> 66 67 #include <scsi/scsi_cmnd.h> 68 #include <scsi/scsi_device.h> 69 #include <scsi/scsi_eh.h> 70 #include <scsi/scsi_tcq.h> 71 #include <scsi/scsi_host.h> 72 #include <scsi/scsi.h> 73 #include <scsi/scsi_transport_iscsi.h> 74 75 #include "iscsi_iser.h" 76 77 static struct scsi_host_template iscsi_iser_sht; 78 static struct iscsi_transport iscsi_iser_transport; 79 static struct scsi_transport_template *iscsi_iser_scsi_transport; 80 81 static unsigned int iscsi_max_lun = 512; 82 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); 83 84 int iser_debug_level = 0; 85 bool iser_pi_enable = false; 86 int iser_pi_guard = 0; 87 88 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover"); 89 MODULE_LICENSE("Dual BSD/GPL"); 90 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); 91 MODULE_VERSION(DRV_VER); 92 93 module_param_named(debug_level, iser_debug_level, int, 0644); 94 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); 95 96 module_param_named(pi_enable, iser_pi_enable, bool, 0644); 97 MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)"); 98 99 module_param_named(pi_guard, iser_pi_guard, int, 0644); 100 MODULE_PARM_DESC(pi_guard, "T10-PI guard_type, 0:CRC|1:IP_CSUM (default:CRC)"); 101 102 static struct workqueue_struct *release_wq; 103 struct iser_global ig; 104 105 void 106 iscsi_iser_recv(struct iscsi_conn *conn, 107 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) 108 { 109 int rc = 0; 110 int datalen; 111 int ahslen; 112 113 /* verify PDU length */ 114 datalen = ntoh24(hdr->dlength); 115 if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { 116 iser_err("wrong datalen %d (hdr), %d (IB)\n", 117 datalen, rx_data_len); 118 rc = ISCSI_ERR_DATALEN; 119 goto error; 120 } 121 122 if (datalen != rx_data_len) 123 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", 124 datalen, rx_data_len); 125 126 /* read AHS */ 127 ahslen = hdr->hlength * 4; 128 129 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 130 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 131 goto error; 132 133 return; 134 error: 135 iscsi_conn_failure(conn, rc); 136 } 137 138 static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) 139 { 140 struct iscsi_iser_task *iser_task = task->dd_data; 141 142 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; 143 task->hdr_max = sizeof(iser_task->desc.iscsi_header); 144 return 0; 145 } 146 147 int iser_initialize_task_headers(struct iscsi_task *task, 148 struct iser_tx_desc *tx_desc) 149 { 150 struct iser_conn *ib_conn = task->conn->dd_data; 151 struct iser_device *device = ib_conn->device; 152 struct iscsi_iser_task *iser_task = task->dd_data; 153 u64 dma_addr; 154 155 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, 156 ISER_HEADERS_LEN, DMA_TO_DEVICE); 157 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 158 return -ENOMEM; 159 160 tx_desc->dma_addr = dma_addr; 161 tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 162 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 163 tx_desc->tx_sg[0].lkey = device->mr->lkey; 164 165 iser_task->ib_conn = ib_conn; 166 return 0; 167 } 168 /** 169 * iscsi_iser_task_init - Initialize task 170 * @task: iscsi task 171 * 172 * Initialize the task for the scsi command or mgmt command. 173 */ 174 static int 175 iscsi_iser_task_init(struct iscsi_task *task) 176 { 177 struct iscsi_iser_task *iser_task = task->dd_data; 178 179 if (iser_initialize_task_headers(task, &iser_task->desc)) 180 return -ENOMEM; 181 182 /* mgmt task */ 183 if (!task->sc) 184 return 0; 185 186 iser_task->command_sent = 0; 187 iser_task_rdma_init(iser_task); 188 iser_task->sc = task->sc; 189 190 return 0; 191 } 192 193 /** 194 * iscsi_iser_mtask_xmit - xmit management(immediate) task 195 * @conn: iscsi connection 196 * @task: task management task 197 * 198 * Notes: 199 * The function can return -EAGAIN in which case caller must 200 * call it again later, or recover. '0' return code means successful 201 * xmit. 202 * 203 **/ 204 static int 205 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 206 { 207 int error = 0; 208 209 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); 210 211 error = iser_send_control(conn, task); 212 213 /* since iser xmits control with zero copy, tasks can not be recycled 214 * right after sending them. 215 * The recycling scheme is based on whether a response is expected 216 * - if yes, the task is recycled at iscsi_complete_pdu 217 * - if no, the task is recycled at iser_snd_completion 218 */ 219 return error; 220 } 221 222 static int 223 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 224 struct iscsi_task *task) 225 { 226 struct iscsi_r2t_info *r2t = &task->unsol_r2t; 227 struct iscsi_data hdr; 228 int error = 0; 229 230 /* Send data-out PDUs while there's still unsolicited data to send */ 231 while (iscsi_task_has_unsol_data(task)) { 232 iscsi_prep_data_out_pdu(task, r2t, &hdr); 233 iser_dbg("Sending data-out: itt 0x%x, data count %d\n", 234 hdr.itt, r2t->data_count); 235 236 /* the buffer description has been passed with the command */ 237 /* Send the command */ 238 error = iser_send_data_out(conn, task, &hdr); 239 if (error) { 240 r2t->datasn--; 241 goto iscsi_iser_task_xmit_unsol_data_exit; 242 } 243 r2t->sent += r2t->data_count; 244 iser_dbg("Need to send %d more as data-out PDUs\n", 245 r2t->data_length - r2t->sent); 246 } 247 248 iscsi_iser_task_xmit_unsol_data_exit: 249 return error; 250 } 251 252 static int 253 iscsi_iser_task_xmit(struct iscsi_task *task) 254 { 255 struct iscsi_conn *conn = task->conn; 256 struct iscsi_iser_task *iser_task = task->dd_data; 257 int error = 0; 258 259 if (!task->sc) 260 return iscsi_iser_mtask_xmit(conn, task); 261 262 if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 263 BUG_ON(scsi_bufflen(task->sc) == 0); 264 265 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", 266 task->itt, scsi_bufflen(task->sc), 267 task->imm_count, task->unsol_r2t.data_length); 268 } 269 270 iser_dbg("ctask xmit [cid %d itt 0x%x]\n", 271 conn->id, task->itt); 272 273 /* Send the cmd PDU */ 274 if (!iser_task->command_sent) { 275 error = iser_send_command(conn, task); 276 if (error) 277 goto iscsi_iser_task_xmit_exit; 278 iser_task->command_sent = 1; 279 } 280 281 /* Send unsolicited data-out PDU(s) if necessary */ 282 if (iscsi_task_has_unsol_data(task)) 283 error = iscsi_iser_task_xmit_unsol_data(conn, task); 284 285 iscsi_iser_task_xmit_exit: 286 return error; 287 } 288 289 static void iscsi_iser_cleanup_task(struct iscsi_task *task) 290 { 291 struct iscsi_iser_task *iser_task = task->dd_data; 292 struct iser_tx_desc *tx_desc = &iser_task->desc; 293 struct iser_conn *ib_conn = task->conn->dd_data; 294 struct iser_device *device = ib_conn->device; 295 296 ib_dma_unmap_single(device->ib_device, 297 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 298 299 /* mgmt tasks do not need special cleanup */ 300 if (!task->sc) 301 return; 302 303 if (iser_task->status == ISER_TASK_STATUS_STARTED) { 304 iser_task->status = ISER_TASK_STATUS_COMPLETED; 305 iser_task_rdma_finalize(iser_task); 306 } 307 } 308 309 static u8 iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector) 310 { 311 struct iscsi_iser_task *iser_task = task->dd_data; 312 313 if (iser_task->dir[ISER_DIR_IN]) 314 return iser_check_task_pi_status(iser_task, ISER_DIR_IN, 315 sector); 316 else 317 return iser_check_task_pi_status(iser_task, ISER_DIR_OUT, 318 sector); 319 } 320 321 static struct iscsi_cls_conn * 322 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 323 { 324 struct iscsi_conn *conn; 325 struct iscsi_cls_conn *cls_conn; 326 327 cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx); 328 if (!cls_conn) 329 return NULL; 330 conn = cls_conn->dd_data; 331 332 /* 333 * due to issues with the login code re iser sematics 334 * this not set in iscsi_conn_setup - FIXME 335 */ 336 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; 337 338 return cls_conn; 339 } 340 341 static int 342 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 343 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, 344 int is_leading) 345 { 346 struct iscsi_conn *conn = cls_conn->dd_data; 347 struct iscsi_session *session; 348 struct iser_conn *ib_conn; 349 struct iscsi_endpoint *ep; 350 int error; 351 352 error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 353 if (error) 354 return error; 355 356 /* the transport ep handle comes from user space so it must be 357 * verified against the global ib connections list */ 358 ep = iscsi_lookup_endpoint(transport_eph); 359 if (!ep) { 360 iser_err("can't bind eph %llx\n", 361 (unsigned long long)transport_eph); 362 return -EINVAL; 363 } 364 ib_conn = ep->dd_data; 365 366 session = conn->session; 367 if (iser_alloc_rx_descriptors(ib_conn, session)) 368 return -ENOMEM; 369 370 /* binds the iSER connection retrieved from the previously 371 * connected ep_handle to the iSCSI layer connection. exchanges 372 * connection pointers */ 373 iser_info("binding iscsi conn %p to ib_conn %p\n", conn, ib_conn); 374 375 conn->dd_data = ib_conn; 376 ib_conn->iscsi_conn = conn; 377 378 return 0; 379 } 380 381 static int 382 iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 383 { 384 struct iscsi_conn *iscsi_conn; 385 struct iser_conn *ib_conn; 386 387 iscsi_conn = cls_conn->dd_data; 388 ib_conn = iscsi_conn->dd_data; 389 reinit_completion(&ib_conn->stop_completion); 390 391 return iscsi_conn_start(cls_conn); 392 } 393 394 static void 395 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 396 { 397 struct iscsi_conn *conn = cls_conn->dd_data; 398 struct iser_conn *ib_conn = conn->dd_data; 399 400 iser_dbg("stopping iscsi_conn: %p, ib_conn: %p\n", conn, ib_conn); 401 iscsi_conn_stop(cls_conn, flag); 402 403 /* 404 * Userspace may have goofed up and not bound the connection or 405 * might have only partially setup the connection. 406 */ 407 if (ib_conn) { 408 conn->dd_data = NULL; 409 complete(&ib_conn->stop_completion); 410 } 411 } 412 413 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 414 { 415 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 416 417 iscsi_session_teardown(cls_session); 418 iscsi_host_remove(shost); 419 iscsi_host_free(shost); 420 } 421 422 static inline unsigned int 423 iser_dif_prot_caps(int prot_caps) 424 { 425 return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? SHOST_DIF_TYPE1_PROTECTION | 426 SHOST_DIX_TYPE1_PROTECTION : 0) | 427 ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? SHOST_DIF_TYPE2_PROTECTION | 428 SHOST_DIX_TYPE2_PROTECTION : 0) | 429 ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? SHOST_DIF_TYPE3_PROTECTION | 430 SHOST_DIX_TYPE3_PROTECTION : 0); 431 } 432 433 static struct iscsi_cls_session * 434 iscsi_iser_session_create(struct iscsi_endpoint *ep, 435 uint16_t cmds_max, uint16_t qdepth, 436 uint32_t initial_cmdsn) 437 { 438 struct iscsi_cls_session *cls_session; 439 struct iscsi_session *session; 440 struct Scsi_Host *shost; 441 struct iser_conn *ib_conn = NULL; 442 443 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); 444 if (!shost) 445 return NULL; 446 shost->transportt = iscsi_iser_scsi_transport; 447 shost->cmd_per_lun = qdepth; 448 shost->max_lun = iscsi_max_lun; 449 shost->max_id = 0; 450 shost->max_channel = 0; 451 shost->max_cmd_len = 16; 452 453 /* 454 * older userspace tools (before 2.0-870) did not pass us 455 * the leading conn's ep so this will be NULL; 456 */ 457 if (ep) { 458 ib_conn = ep->dd_data; 459 if (ib_conn->pi_support) { 460 u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap; 461 462 scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps)); 463 if (iser_pi_guard) 464 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); 465 else 466 scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC); 467 } 468 } 469 470 if (iscsi_host_add(shost, 471 ep ? ib_conn->device->ib_device->dma_device : NULL)) 472 goto free_host; 473 474 if (cmds_max > ISER_DEF_XMIT_CMDS_MAX) { 475 iser_info("cmds_max changed from %u to %u\n", 476 cmds_max, ISER_DEF_XMIT_CMDS_MAX); 477 cmds_max = ISER_DEF_XMIT_CMDS_MAX; 478 } 479 480 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 481 cmds_max, 0, 482 sizeof(struct iscsi_iser_task), 483 initial_cmdsn, 0); 484 if (!cls_session) 485 goto remove_host; 486 session = cls_session->dd_data; 487 488 shost->can_queue = session->scsi_cmds_max; 489 return cls_session; 490 491 remove_host: 492 iscsi_host_remove(shost); 493 free_host: 494 iscsi_host_free(shost); 495 return NULL; 496 } 497 498 static int 499 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 500 enum iscsi_param param, char *buf, int buflen) 501 { 502 int value; 503 504 switch (param) { 505 case ISCSI_PARAM_MAX_RECV_DLENGTH: 506 /* TBD */ 507 break; 508 case ISCSI_PARAM_HDRDGST_EN: 509 sscanf(buf, "%d", &value); 510 if (value) { 511 iser_err("DataDigest wasn't negotiated to None\n"); 512 return -EPROTO; 513 } 514 break; 515 case ISCSI_PARAM_DATADGST_EN: 516 sscanf(buf, "%d", &value); 517 if (value) { 518 iser_err("DataDigest wasn't negotiated to None\n"); 519 return -EPROTO; 520 } 521 break; 522 case ISCSI_PARAM_IFMARKER_EN: 523 sscanf(buf, "%d", &value); 524 if (value) { 525 iser_err("IFMarker wasn't negotiated to No\n"); 526 return -EPROTO; 527 } 528 break; 529 case ISCSI_PARAM_OFMARKER_EN: 530 sscanf(buf, "%d", &value); 531 if (value) { 532 iser_err("OFMarker wasn't negotiated to No\n"); 533 return -EPROTO; 534 } 535 break; 536 default: 537 return iscsi_set_param(cls_conn, param, buf, buflen); 538 } 539 540 return 0; 541 } 542 543 static void 544 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 545 { 546 struct iscsi_conn *conn = cls_conn->dd_data; 547 548 stats->txdata_octets = conn->txdata_octets; 549 stats->rxdata_octets = conn->rxdata_octets; 550 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 551 stats->dataout_pdus = conn->dataout_pdus_cnt; 552 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 553 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 554 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 555 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 556 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 557 stats->custom_length = 4; 558 strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 559 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 560 strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 561 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 562 strcpy(stats->custom[2].desc, "eh_abort_cnt"); 563 stats->custom[2].value = conn->eh_abort_cnt; 564 strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 565 stats->custom[3].value = conn->fmr_unalign_cnt; 566 } 567 568 static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, 569 enum iscsi_param param, char *buf) 570 { 571 struct iser_conn *ib_conn = ep->dd_data; 572 int len; 573 574 switch (param) { 575 case ISCSI_PARAM_CONN_PORT: 576 case ISCSI_PARAM_CONN_ADDRESS: 577 if (!ib_conn || !ib_conn->cma_id) 578 return -ENOTCONN; 579 580 return iscsi_conn_get_addr_param((struct sockaddr_storage *) 581 &ib_conn->cma_id->route.addr.dst_addr, 582 param, buf); 583 break; 584 default: 585 return -ENOSYS; 586 } 587 588 return len; 589 } 590 591 static struct iscsi_endpoint * 592 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, 593 int non_blocking) 594 { 595 int err; 596 struct iser_conn *ib_conn; 597 struct iscsi_endpoint *ep; 598 599 ep = iscsi_create_endpoint(sizeof(*ib_conn)); 600 if (!ep) 601 return ERR_PTR(-ENOMEM); 602 603 ib_conn = ep->dd_data; 604 ib_conn->ep = ep; 605 iser_conn_init(ib_conn); 606 607 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, 608 non_blocking); 609 if (err) 610 return ERR_PTR(err); 611 612 return ep; 613 } 614 615 static int 616 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 617 { 618 struct iser_conn *ib_conn; 619 int rc; 620 621 ib_conn = ep->dd_data; 622 rc = wait_event_interruptible_timeout(ib_conn->wait, 623 ib_conn->state == ISER_CONN_UP, 624 msecs_to_jiffies(timeout_ms)); 625 626 /* if conn establishment failed, return error code to iscsi */ 627 if (!rc && 628 (ib_conn->state == ISER_CONN_TERMINATING || 629 ib_conn->state == ISER_CONN_DOWN)) 630 rc = -1; 631 632 iser_info("ib conn %p rc = %d\n", ib_conn, rc); 633 634 if (rc > 0) 635 return 1; /* success, this is the equivalent of POLLOUT */ 636 else if (!rc) 637 return 0; /* timeout */ 638 else 639 return rc; /* signal */ 640 } 641 642 static void 643 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 644 { 645 struct iser_conn *ib_conn; 646 647 ib_conn = ep->dd_data; 648 iser_info("ep %p ib conn %p state %d\n", ep, ib_conn, ib_conn->state); 649 iser_conn_terminate(ib_conn); 650 651 /* 652 * if iser_conn and iscsi_conn are bound, we must wait iscsi_conn_stop 653 * call and ISER_CONN_DOWN state before freeing the iser resources. 654 * otherwise we are safe to free resources immediately. 655 */ 656 if (ib_conn->iscsi_conn) { 657 INIT_WORK(&ib_conn->release_work, iser_release_work); 658 queue_work(release_wq, &ib_conn->release_work); 659 } else { 660 iser_conn_release(ib_conn); 661 } 662 } 663 664 static umode_t iser_attr_is_visible(int param_type, int param) 665 { 666 switch (param_type) { 667 case ISCSI_HOST_PARAM: 668 switch (param) { 669 case ISCSI_HOST_PARAM_NETDEV_NAME: 670 case ISCSI_HOST_PARAM_HWADDRESS: 671 case ISCSI_HOST_PARAM_INITIATOR_NAME: 672 return S_IRUGO; 673 default: 674 return 0; 675 } 676 case ISCSI_PARAM: 677 switch (param) { 678 case ISCSI_PARAM_MAX_RECV_DLENGTH: 679 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 680 case ISCSI_PARAM_HDRDGST_EN: 681 case ISCSI_PARAM_DATADGST_EN: 682 case ISCSI_PARAM_CONN_ADDRESS: 683 case ISCSI_PARAM_CONN_PORT: 684 case ISCSI_PARAM_EXP_STATSN: 685 case ISCSI_PARAM_PERSISTENT_ADDRESS: 686 case ISCSI_PARAM_PERSISTENT_PORT: 687 case ISCSI_PARAM_PING_TMO: 688 case ISCSI_PARAM_RECV_TMO: 689 case ISCSI_PARAM_INITIAL_R2T_EN: 690 case ISCSI_PARAM_MAX_R2T: 691 case ISCSI_PARAM_IMM_DATA_EN: 692 case ISCSI_PARAM_FIRST_BURST: 693 case ISCSI_PARAM_MAX_BURST: 694 case ISCSI_PARAM_PDU_INORDER_EN: 695 case ISCSI_PARAM_DATASEQ_INORDER_EN: 696 case ISCSI_PARAM_TARGET_NAME: 697 case ISCSI_PARAM_TPGT: 698 case ISCSI_PARAM_USERNAME: 699 case ISCSI_PARAM_PASSWORD: 700 case ISCSI_PARAM_USERNAME_IN: 701 case ISCSI_PARAM_PASSWORD_IN: 702 case ISCSI_PARAM_FAST_ABORT: 703 case ISCSI_PARAM_ABORT_TMO: 704 case ISCSI_PARAM_LU_RESET_TMO: 705 case ISCSI_PARAM_TGT_RESET_TMO: 706 case ISCSI_PARAM_IFACE_NAME: 707 case ISCSI_PARAM_INITIATOR_NAME: 708 case ISCSI_PARAM_DISCOVERY_SESS: 709 return S_IRUGO; 710 default: 711 return 0; 712 } 713 } 714 715 return 0; 716 } 717 718 static struct scsi_host_template iscsi_iser_sht = { 719 .module = THIS_MODULE, 720 .name = "iSCSI Initiator over iSER", 721 .queuecommand = iscsi_queuecommand, 722 .change_queue_depth = iscsi_change_queue_depth, 723 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 724 .max_sectors = 1024, 725 .cmd_per_lun = ISER_DEF_CMD_PER_LUN, 726 .eh_abort_handler = iscsi_eh_abort, 727 .eh_device_reset_handler= iscsi_eh_device_reset, 728 .eh_target_reset_handler = iscsi_eh_recover_target, 729 .target_alloc = iscsi_target_alloc, 730 .use_clustering = DISABLE_CLUSTERING, 731 .proc_name = "iscsi_iser", 732 .this_id = -1, 733 }; 734 735 static struct iscsi_transport iscsi_iser_transport = { 736 .owner = THIS_MODULE, 737 .name = "iser", 738 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO, 739 /* session management */ 740 .create_session = iscsi_iser_session_create, 741 .destroy_session = iscsi_iser_session_destroy, 742 /* connection management */ 743 .create_conn = iscsi_iser_conn_create, 744 .bind_conn = iscsi_iser_conn_bind, 745 .destroy_conn = iscsi_conn_teardown, 746 .attr_is_visible = iser_attr_is_visible, 747 .set_param = iscsi_iser_set_param, 748 .get_conn_param = iscsi_conn_get_param, 749 .get_ep_param = iscsi_iser_get_ep_param, 750 .get_session_param = iscsi_session_get_param, 751 .start_conn = iscsi_iser_conn_start, 752 .stop_conn = iscsi_iser_conn_stop, 753 /* iscsi host params */ 754 .get_host_param = iscsi_host_get_param, 755 .set_host_param = iscsi_host_set_param, 756 /* IO */ 757 .send_pdu = iscsi_conn_send_pdu, 758 .get_stats = iscsi_iser_conn_get_stats, 759 .init_task = iscsi_iser_task_init, 760 .xmit_task = iscsi_iser_task_xmit, 761 .cleanup_task = iscsi_iser_cleanup_task, 762 .alloc_pdu = iscsi_iser_pdu_alloc, 763 .check_protection = iscsi_iser_check_protection, 764 /* recovery */ 765 .session_recovery_timedout = iscsi_session_recovery_timedout, 766 767 .ep_connect = iscsi_iser_ep_connect, 768 .ep_poll = iscsi_iser_ep_poll, 769 .ep_disconnect = iscsi_iser_ep_disconnect 770 }; 771 772 static int __init iser_init(void) 773 { 774 int err; 775 776 iser_dbg("Starting iSER datamover...\n"); 777 778 if (iscsi_max_lun < 1) { 779 iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); 780 return -EINVAL; 781 } 782 783 memset(&ig, 0, sizeof(struct iser_global)); 784 785 ig.desc_cache = kmem_cache_create("iser_descriptors", 786 sizeof(struct iser_tx_desc), 787 0, SLAB_HWCACHE_ALIGN, 788 NULL); 789 if (ig.desc_cache == NULL) 790 return -ENOMEM; 791 792 /* device init is called only after the first addr resolution */ 793 mutex_init(&ig.device_list_mutex); 794 INIT_LIST_HEAD(&ig.device_list); 795 mutex_init(&ig.connlist_mutex); 796 INIT_LIST_HEAD(&ig.connlist); 797 798 release_wq = alloc_workqueue("release workqueue", 0, 0); 799 if (!release_wq) { 800 iser_err("failed to allocate release workqueue\n"); 801 return -ENOMEM; 802 } 803 804 iscsi_iser_scsi_transport = iscsi_register_transport( 805 &iscsi_iser_transport); 806 if (!iscsi_iser_scsi_transport) { 807 iser_err("iscsi_register_transport failed\n"); 808 err = -EINVAL; 809 goto register_transport_failure; 810 } 811 812 return 0; 813 814 register_transport_failure: 815 kmem_cache_destroy(ig.desc_cache); 816 817 return err; 818 } 819 820 static void __exit iser_exit(void) 821 { 822 struct iser_conn *ib_conn, *n; 823 int connlist_empty; 824 825 iser_dbg("Removing iSER datamover...\n"); 826 destroy_workqueue(release_wq); 827 828 mutex_lock(&ig.connlist_mutex); 829 connlist_empty = list_empty(&ig.connlist); 830 mutex_unlock(&ig.connlist_mutex); 831 832 if (!connlist_empty) { 833 iser_err("Error cleanup stage completed but we still have iser " 834 "connections, destroying them anyway.\n"); 835 list_for_each_entry_safe(ib_conn, n, &ig.connlist, conn_list) { 836 iser_conn_release(ib_conn); 837 } 838 } 839 840 iscsi_unregister_transport(&iscsi_iser_transport); 841 kmem_cache_destroy(ig.desc_cache); 842 } 843 844 module_init(iser_init); 845 module_exit(iser_exit); 846