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 struct iser_global ig; 103 104 void 105 iscsi_iser_recv(struct iscsi_conn *conn, 106 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) 107 { 108 int rc = 0; 109 int datalen; 110 int ahslen; 111 112 /* verify PDU length */ 113 datalen = ntoh24(hdr->dlength); 114 if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { 115 iser_err("wrong datalen %d (hdr), %d (IB)\n", 116 datalen, rx_data_len); 117 rc = ISCSI_ERR_DATALEN; 118 goto error; 119 } 120 121 if (datalen != rx_data_len) 122 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", 123 datalen, rx_data_len); 124 125 /* read AHS */ 126 ahslen = hdr->hlength * 4; 127 128 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 129 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 130 goto error; 131 132 return; 133 error: 134 iscsi_conn_failure(conn, rc); 135 } 136 137 static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) 138 { 139 struct iscsi_iser_task *iser_task = task->dd_data; 140 141 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; 142 task->hdr_max = sizeof(iser_task->desc.iscsi_header); 143 return 0; 144 } 145 146 int iser_initialize_task_headers(struct iscsi_task *task, 147 struct iser_tx_desc *tx_desc) 148 { 149 struct iser_conn *ib_conn = task->conn->dd_data; 150 struct iser_device *device = ib_conn->device; 151 struct iscsi_iser_task *iser_task = task->dd_data; 152 u64 dma_addr; 153 154 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, 155 ISER_HEADERS_LEN, DMA_TO_DEVICE); 156 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 157 return -ENOMEM; 158 159 tx_desc->dma_addr = dma_addr; 160 tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 161 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 162 tx_desc->tx_sg[0].lkey = device->mr->lkey; 163 164 iser_task->ib_conn = ib_conn; 165 return 0; 166 } 167 /** 168 * iscsi_iser_task_init - Initialize task 169 * @task: iscsi task 170 * 171 * Initialize the task for the scsi command or mgmt command. 172 */ 173 static int 174 iscsi_iser_task_init(struct iscsi_task *task) 175 { 176 struct iscsi_iser_task *iser_task = task->dd_data; 177 178 if (iser_initialize_task_headers(task, &iser_task->desc)) 179 return -ENOMEM; 180 181 /* mgmt task */ 182 if (!task->sc) 183 return 0; 184 185 iser_task->command_sent = 0; 186 iser_task_rdma_init(iser_task); 187 iser_task->sc = task->sc; 188 189 return 0; 190 } 191 192 /** 193 * iscsi_iser_mtask_xmit - xmit management(immediate) task 194 * @conn: iscsi connection 195 * @task: task management task 196 * 197 * Notes: 198 * The function can return -EAGAIN in which case caller must 199 * call it again later, or recover. '0' return code means successful 200 * xmit. 201 * 202 **/ 203 static int 204 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 205 { 206 int error = 0; 207 208 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); 209 210 error = iser_send_control(conn, task); 211 212 /* since iser xmits control with zero copy, tasks can not be recycled 213 * right after sending them. 214 * The recycling scheme is based on whether a response is expected 215 * - if yes, the task is recycled at iscsi_complete_pdu 216 * - if no, the task is recycled at iser_snd_completion 217 */ 218 return error; 219 } 220 221 static int 222 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 223 struct iscsi_task *task) 224 { 225 struct iscsi_r2t_info *r2t = &task->unsol_r2t; 226 struct iscsi_data hdr; 227 int error = 0; 228 229 /* Send data-out PDUs while there's still unsolicited data to send */ 230 while (iscsi_task_has_unsol_data(task)) { 231 iscsi_prep_data_out_pdu(task, r2t, &hdr); 232 iser_dbg("Sending data-out: itt 0x%x, data count %d\n", 233 hdr.itt, r2t->data_count); 234 235 /* the buffer description has been passed with the command */ 236 /* Send the command */ 237 error = iser_send_data_out(conn, task, &hdr); 238 if (error) { 239 r2t->datasn--; 240 goto iscsi_iser_task_xmit_unsol_data_exit; 241 } 242 r2t->sent += r2t->data_count; 243 iser_dbg("Need to send %d more as data-out PDUs\n", 244 r2t->data_length - r2t->sent); 245 } 246 247 iscsi_iser_task_xmit_unsol_data_exit: 248 return error; 249 } 250 251 static int 252 iscsi_iser_task_xmit(struct iscsi_task *task) 253 { 254 struct iscsi_conn *conn = task->conn; 255 struct iscsi_iser_task *iser_task = task->dd_data; 256 int error = 0; 257 258 if (!task->sc) 259 return iscsi_iser_mtask_xmit(conn, task); 260 261 if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 262 BUG_ON(scsi_bufflen(task->sc) == 0); 263 264 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", 265 task->itt, scsi_bufflen(task->sc), 266 task->imm_count, task->unsol_r2t.data_length); 267 } 268 269 iser_dbg("ctask xmit [cid %d itt 0x%x]\n", 270 conn->id, task->itt); 271 272 /* Send the cmd PDU */ 273 if (!iser_task->command_sent) { 274 error = iser_send_command(conn, task); 275 if (error) 276 goto iscsi_iser_task_xmit_exit; 277 iser_task->command_sent = 1; 278 } 279 280 /* Send unsolicited data-out PDU(s) if necessary */ 281 if (iscsi_task_has_unsol_data(task)) 282 error = iscsi_iser_task_xmit_unsol_data(conn, task); 283 284 iscsi_iser_task_xmit_exit: 285 return error; 286 } 287 288 static void iscsi_iser_cleanup_task(struct iscsi_task *task) 289 { 290 struct iscsi_iser_task *iser_task = task->dd_data; 291 struct iser_tx_desc *tx_desc = &iser_task->desc; 292 struct iser_conn *ib_conn = task->conn->dd_data; 293 struct iser_device *device = ib_conn->device; 294 295 ib_dma_unmap_single(device->ib_device, 296 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 297 298 /* mgmt tasks do not need special cleanup */ 299 if (!task->sc) 300 return; 301 302 if (iser_task->status == ISER_TASK_STATUS_STARTED) { 303 iser_task->status = ISER_TASK_STATUS_COMPLETED; 304 iser_task_rdma_finalize(iser_task); 305 } 306 } 307 308 static u8 iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector) 309 { 310 struct iscsi_iser_task *iser_task = task->dd_data; 311 312 if (iser_task->dir[ISER_DIR_IN]) 313 return iser_check_task_pi_status(iser_task, ISER_DIR_IN, 314 sector); 315 else 316 return iser_check_task_pi_status(iser_task, ISER_DIR_OUT, 317 sector); 318 } 319 320 static struct iscsi_cls_conn * 321 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 322 { 323 struct iscsi_conn *conn; 324 struct iscsi_cls_conn *cls_conn; 325 326 cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx); 327 if (!cls_conn) 328 return NULL; 329 conn = cls_conn->dd_data; 330 331 /* 332 * due to issues with the login code re iser sematics 333 * this not set in iscsi_conn_setup - FIXME 334 */ 335 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; 336 337 return cls_conn; 338 } 339 340 static void 341 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) 342 { 343 struct iscsi_conn *conn = cls_conn->dd_data; 344 struct iser_conn *ib_conn = conn->dd_data; 345 346 iscsi_conn_teardown(cls_conn); 347 /* 348 * Userspace will normally call the stop callback and 349 * already have freed the ib_conn, but if it goofed up then 350 * we free it here. 351 */ 352 if (ib_conn) { 353 ib_conn->iscsi_conn = NULL; 354 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ 355 } 356 } 357 358 static int 359 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 360 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, 361 int is_leading) 362 { 363 struct iscsi_conn *conn = cls_conn->dd_data; 364 struct iscsi_session *session; 365 struct iser_conn *ib_conn; 366 struct iscsi_endpoint *ep; 367 int error; 368 369 error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 370 if (error) 371 return error; 372 373 /* the transport ep handle comes from user space so it must be 374 * verified against the global ib connections list */ 375 ep = iscsi_lookup_endpoint(transport_eph); 376 if (!ep) { 377 iser_err("can't bind eph %llx\n", 378 (unsigned long long)transport_eph); 379 return -EINVAL; 380 } 381 ib_conn = ep->dd_data; 382 383 session = conn->session; 384 if (iser_alloc_rx_descriptors(ib_conn, session)) 385 return -ENOMEM; 386 387 /* binds the iSER connection retrieved from the previously 388 * connected ep_handle to the iSCSI layer connection. exchanges 389 * connection pointers */ 390 iser_info("binding iscsi conn %p to ib_conn %p\n", conn, ib_conn); 391 392 conn->dd_data = ib_conn; 393 ib_conn->iscsi_conn = conn; 394 395 iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */ 396 return 0; 397 } 398 399 static void 400 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 401 { 402 struct iscsi_conn *conn = cls_conn->dd_data; 403 struct iser_conn *ib_conn = conn->dd_data; 404 405 /* 406 * Userspace may have goofed up and not bound the connection or 407 * might have only partially setup the connection. 408 */ 409 if (ib_conn) { 410 iscsi_conn_stop(cls_conn, flag); 411 /* 412 * There is no unbind event so the stop callback 413 * must release the ref from the bind. 414 */ 415 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ 416 } 417 conn->dd_data = NULL; 418 } 419 420 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 421 { 422 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 423 424 iscsi_session_teardown(cls_session); 425 iscsi_host_remove(shost); 426 iscsi_host_free(shost); 427 } 428 429 static inline unsigned int 430 iser_dif_prot_caps(int prot_caps) 431 { 432 return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? SHOST_DIF_TYPE1_PROTECTION | 433 SHOST_DIX_TYPE1_PROTECTION : 0) | 434 ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? SHOST_DIF_TYPE2_PROTECTION | 435 SHOST_DIX_TYPE2_PROTECTION : 0) | 436 ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? SHOST_DIF_TYPE3_PROTECTION | 437 SHOST_DIX_TYPE3_PROTECTION : 0); 438 } 439 440 static struct iscsi_cls_session * 441 iscsi_iser_session_create(struct iscsi_endpoint *ep, 442 uint16_t cmds_max, uint16_t qdepth, 443 uint32_t initial_cmdsn) 444 { 445 struct iscsi_cls_session *cls_session; 446 struct iscsi_session *session; 447 struct Scsi_Host *shost; 448 struct iser_conn *ib_conn = NULL; 449 450 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); 451 if (!shost) 452 return NULL; 453 shost->transportt = iscsi_iser_scsi_transport; 454 shost->cmd_per_lun = qdepth; 455 shost->max_lun = iscsi_max_lun; 456 shost->max_id = 0; 457 shost->max_channel = 0; 458 shost->max_cmd_len = 16; 459 460 /* 461 * older userspace tools (before 2.0-870) did not pass us 462 * the leading conn's ep so this will be NULL; 463 */ 464 if (ep) { 465 ib_conn = ep->dd_data; 466 if (ib_conn->pi_support) { 467 u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap; 468 469 scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps)); 470 if (iser_pi_guard) 471 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); 472 else 473 scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC); 474 } 475 } 476 477 if (iscsi_host_add(shost, 478 ep ? ib_conn->device->ib_device->dma_device : NULL)) 479 goto free_host; 480 481 if (cmds_max > ISER_DEF_XMIT_CMDS_MAX) { 482 iser_info("cmds_max changed from %u to %u\n", 483 cmds_max, ISER_DEF_XMIT_CMDS_MAX); 484 cmds_max = ISER_DEF_XMIT_CMDS_MAX; 485 } 486 487 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 488 cmds_max, 0, 489 sizeof(struct iscsi_iser_task), 490 initial_cmdsn, 0); 491 if (!cls_session) 492 goto remove_host; 493 session = cls_session->dd_data; 494 495 shost->can_queue = session->scsi_cmds_max; 496 return cls_session; 497 498 remove_host: 499 iscsi_host_remove(shost); 500 free_host: 501 iscsi_host_free(shost); 502 return NULL; 503 } 504 505 static int 506 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 507 enum iscsi_param param, char *buf, int buflen) 508 { 509 int value; 510 511 switch (param) { 512 case ISCSI_PARAM_MAX_RECV_DLENGTH: 513 /* TBD */ 514 break; 515 case ISCSI_PARAM_HDRDGST_EN: 516 sscanf(buf, "%d", &value); 517 if (value) { 518 iser_err("DataDigest wasn't negotiated to None"); 519 return -EPROTO; 520 } 521 break; 522 case ISCSI_PARAM_DATADGST_EN: 523 sscanf(buf, "%d", &value); 524 if (value) { 525 iser_err("DataDigest wasn't negotiated to None"); 526 return -EPROTO; 527 } 528 break; 529 case ISCSI_PARAM_IFMARKER_EN: 530 sscanf(buf, "%d", &value); 531 if (value) { 532 iser_err("IFMarker wasn't negotiated to No"); 533 return -EPROTO; 534 } 535 break; 536 case ISCSI_PARAM_OFMARKER_EN: 537 sscanf(buf, "%d", &value); 538 if (value) { 539 iser_err("OFMarker wasn't negotiated to No"); 540 return -EPROTO; 541 } 542 break; 543 default: 544 return iscsi_set_param(cls_conn, param, buf, buflen); 545 } 546 547 return 0; 548 } 549 550 static void 551 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 552 { 553 struct iscsi_conn *conn = cls_conn->dd_data; 554 555 stats->txdata_octets = conn->txdata_octets; 556 stats->rxdata_octets = conn->rxdata_octets; 557 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 558 stats->dataout_pdus = conn->dataout_pdus_cnt; 559 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 560 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 561 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 562 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 563 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 564 stats->custom_length = 4; 565 strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 566 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 567 strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 568 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 569 strcpy(stats->custom[2].desc, "eh_abort_cnt"); 570 stats->custom[2].value = conn->eh_abort_cnt; 571 strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 572 stats->custom[3].value = conn->fmr_unalign_cnt; 573 } 574 575 static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, 576 enum iscsi_param param, char *buf) 577 { 578 struct iser_conn *ib_conn = ep->dd_data; 579 int len; 580 581 switch (param) { 582 case ISCSI_PARAM_CONN_PORT: 583 case ISCSI_PARAM_CONN_ADDRESS: 584 if (!ib_conn || !ib_conn->cma_id) 585 return -ENOTCONN; 586 587 return iscsi_conn_get_addr_param((struct sockaddr_storage *) 588 &ib_conn->cma_id->route.addr.dst_addr, 589 param, buf); 590 break; 591 default: 592 return -ENOSYS; 593 } 594 595 return len; 596 } 597 598 static struct iscsi_endpoint * 599 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, 600 int non_blocking) 601 { 602 int err; 603 struct iser_conn *ib_conn; 604 struct iscsi_endpoint *ep; 605 606 ep = iscsi_create_endpoint(sizeof(*ib_conn)); 607 if (!ep) 608 return ERR_PTR(-ENOMEM); 609 610 ib_conn = ep->dd_data; 611 ib_conn->ep = ep; 612 iser_conn_init(ib_conn); 613 614 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, 615 non_blocking); 616 if (err) 617 return ERR_PTR(err); 618 619 return ep; 620 } 621 622 static int 623 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 624 { 625 struct iser_conn *ib_conn; 626 int rc; 627 628 ib_conn = ep->dd_data; 629 rc = wait_event_interruptible_timeout(ib_conn->wait, 630 ib_conn->state == ISER_CONN_UP, 631 msecs_to_jiffies(timeout_ms)); 632 633 /* if conn establishment failed, return error code to iscsi */ 634 if (!rc && 635 (ib_conn->state == ISER_CONN_TERMINATING || 636 ib_conn->state == ISER_CONN_DOWN)) 637 rc = -1; 638 639 iser_info("ib conn %p rc = %d\n", ib_conn, rc); 640 641 if (rc > 0) 642 return 1; /* success, this is the equivalent of POLLOUT */ 643 else if (!rc) 644 return 0; /* timeout */ 645 else 646 return rc; /* signal */ 647 } 648 649 static void 650 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 651 { 652 struct iser_conn *ib_conn; 653 654 ib_conn = ep->dd_data; 655 if (ib_conn->iscsi_conn) 656 /* 657 * Must suspend xmit path if the ep is bound to the 658 * iscsi_conn, so we know we are not accessing the ib_conn 659 * when we free it. 660 * 661 * This may not be bound if the ep poll failed. 662 */ 663 iscsi_suspend_tx(ib_conn->iscsi_conn); 664 665 666 iser_info("ib conn %p state %d\n", ib_conn, ib_conn->state); 667 iser_conn_terminate(ib_conn); 668 } 669 670 static umode_t iser_attr_is_visible(int param_type, int param) 671 { 672 switch (param_type) { 673 case ISCSI_HOST_PARAM: 674 switch (param) { 675 case ISCSI_HOST_PARAM_NETDEV_NAME: 676 case ISCSI_HOST_PARAM_HWADDRESS: 677 case ISCSI_HOST_PARAM_INITIATOR_NAME: 678 return S_IRUGO; 679 default: 680 return 0; 681 } 682 case ISCSI_PARAM: 683 switch (param) { 684 case ISCSI_PARAM_MAX_RECV_DLENGTH: 685 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 686 case ISCSI_PARAM_HDRDGST_EN: 687 case ISCSI_PARAM_DATADGST_EN: 688 case ISCSI_PARAM_CONN_ADDRESS: 689 case ISCSI_PARAM_CONN_PORT: 690 case ISCSI_PARAM_EXP_STATSN: 691 case ISCSI_PARAM_PERSISTENT_ADDRESS: 692 case ISCSI_PARAM_PERSISTENT_PORT: 693 case ISCSI_PARAM_PING_TMO: 694 case ISCSI_PARAM_RECV_TMO: 695 case ISCSI_PARAM_INITIAL_R2T_EN: 696 case ISCSI_PARAM_MAX_R2T: 697 case ISCSI_PARAM_IMM_DATA_EN: 698 case ISCSI_PARAM_FIRST_BURST: 699 case ISCSI_PARAM_MAX_BURST: 700 case ISCSI_PARAM_PDU_INORDER_EN: 701 case ISCSI_PARAM_DATASEQ_INORDER_EN: 702 case ISCSI_PARAM_TARGET_NAME: 703 case ISCSI_PARAM_TPGT: 704 case ISCSI_PARAM_USERNAME: 705 case ISCSI_PARAM_PASSWORD: 706 case ISCSI_PARAM_USERNAME_IN: 707 case ISCSI_PARAM_PASSWORD_IN: 708 case ISCSI_PARAM_FAST_ABORT: 709 case ISCSI_PARAM_ABORT_TMO: 710 case ISCSI_PARAM_LU_RESET_TMO: 711 case ISCSI_PARAM_TGT_RESET_TMO: 712 case ISCSI_PARAM_IFACE_NAME: 713 case ISCSI_PARAM_INITIATOR_NAME: 714 case ISCSI_PARAM_DISCOVERY_SESS: 715 return S_IRUGO; 716 default: 717 return 0; 718 } 719 } 720 721 return 0; 722 } 723 724 static struct scsi_host_template iscsi_iser_sht = { 725 .module = THIS_MODULE, 726 .name = "iSCSI Initiator over iSER", 727 .queuecommand = iscsi_queuecommand, 728 .change_queue_depth = iscsi_change_queue_depth, 729 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 730 .max_sectors = 1024, 731 .cmd_per_lun = ISER_DEF_CMD_PER_LUN, 732 .eh_abort_handler = iscsi_eh_abort, 733 .eh_device_reset_handler= iscsi_eh_device_reset, 734 .eh_target_reset_handler = iscsi_eh_recover_target, 735 .target_alloc = iscsi_target_alloc, 736 .use_clustering = DISABLE_CLUSTERING, 737 .proc_name = "iscsi_iser", 738 .this_id = -1, 739 }; 740 741 static struct iscsi_transport iscsi_iser_transport = { 742 .owner = THIS_MODULE, 743 .name = "iser", 744 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO, 745 /* session management */ 746 .create_session = iscsi_iser_session_create, 747 .destroy_session = iscsi_iser_session_destroy, 748 /* connection management */ 749 .create_conn = iscsi_iser_conn_create, 750 .bind_conn = iscsi_iser_conn_bind, 751 .destroy_conn = iscsi_iser_conn_destroy, 752 .attr_is_visible = iser_attr_is_visible, 753 .set_param = iscsi_iser_set_param, 754 .get_conn_param = iscsi_conn_get_param, 755 .get_ep_param = iscsi_iser_get_ep_param, 756 .get_session_param = iscsi_session_get_param, 757 .start_conn = iscsi_conn_start, 758 .stop_conn = iscsi_iser_conn_stop, 759 /* iscsi host params */ 760 .get_host_param = iscsi_host_get_param, 761 .set_host_param = iscsi_host_set_param, 762 /* IO */ 763 .send_pdu = iscsi_conn_send_pdu, 764 .get_stats = iscsi_iser_conn_get_stats, 765 .init_task = iscsi_iser_task_init, 766 .xmit_task = iscsi_iser_task_xmit, 767 .cleanup_task = iscsi_iser_cleanup_task, 768 .alloc_pdu = iscsi_iser_pdu_alloc, 769 .check_protection = iscsi_iser_check_protection, 770 /* recovery */ 771 .session_recovery_timedout = iscsi_session_recovery_timedout, 772 773 .ep_connect = iscsi_iser_ep_connect, 774 .ep_poll = iscsi_iser_ep_poll, 775 .ep_disconnect = iscsi_iser_ep_disconnect 776 }; 777 778 static int __init iser_init(void) 779 { 780 int err; 781 782 iser_dbg("Starting iSER datamover...\n"); 783 784 if (iscsi_max_lun < 1) { 785 iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); 786 return -EINVAL; 787 } 788 789 memset(&ig, 0, sizeof(struct iser_global)); 790 791 ig.desc_cache = kmem_cache_create("iser_descriptors", 792 sizeof(struct iser_tx_desc), 793 0, SLAB_HWCACHE_ALIGN, 794 NULL); 795 if (ig.desc_cache == NULL) 796 return -ENOMEM; 797 798 /* device init is called only after the first addr resolution */ 799 mutex_init(&ig.device_list_mutex); 800 INIT_LIST_HEAD(&ig.device_list); 801 mutex_init(&ig.connlist_mutex); 802 INIT_LIST_HEAD(&ig.connlist); 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 iser_dbg("Removing iSER datamover...\n"); 823 iscsi_unregister_transport(&iscsi_iser_transport); 824 kmem_cache_destroy(ig.desc_cache); 825 } 826 827 module_init(iser_init); 828 module_exit(iser_exit); 829