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 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 86 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover"); 87 MODULE_LICENSE("Dual BSD/GPL"); 88 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); 89 MODULE_VERSION(DRV_VER); 90 91 module_param_named(debug_level, iser_debug_level, int, 0644); 92 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); 93 94 struct iser_global ig; 95 96 void 97 iscsi_iser_recv(struct iscsi_conn *conn, 98 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) 99 { 100 int rc = 0; 101 int datalen; 102 int ahslen; 103 104 /* verify PDU length */ 105 datalen = ntoh24(hdr->dlength); 106 if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { 107 iser_err("wrong datalen %d (hdr), %d (IB)\n", 108 datalen, rx_data_len); 109 rc = ISCSI_ERR_DATALEN; 110 goto error; 111 } 112 113 if (datalen != rx_data_len) 114 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", 115 datalen, rx_data_len); 116 117 /* read AHS */ 118 ahslen = hdr->hlength * 4; 119 120 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 121 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 122 goto error; 123 124 return; 125 error: 126 iscsi_conn_failure(conn, rc); 127 } 128 129 static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) 130 { 131 struct iscsi_iser_task *iser_task = task->dd_data; 132 133 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; 134 task->hdr_max = sizeof(iser_task->desc.iscsi_header); 135 return 0; 136 } 137 138 int iser_initialize_task_headers(struct iscsi_task *task, 139 struct iser_tx_desc *tx_desc) 140 { 141 struct iscsi_iser_conn *iser_conn = task->conn->dd_data; 142 struct iser_device *device = iser_conn->ib_conn->device; 143 struct iscsi_iser_task *iser_task = task->dd_data; 144 u64 dma_addr; 145 146 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, 147 ISER_HEADERS_LEN, DMA_TO_DEVICE); 148 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 149 return -ENOMEM; 150 151 tx_desc->dma_addr = dma_addr; 152 tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 153 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 154 tx_desc->tx_sg[0].lkey = device->mr->lkey; 155 156 iser_task->iser_conn = iser_conn; 157 return 0; 158 } 159 /** 160 * iscsi_iser_task_init - Initialize task 161 * @task: iscsi task 162 * 163 * Initialize the task for the scsi command or mgmt command. 164 */ 165 static int 166 iscsi_iser_task_init(struct iscsi_task *task) 167 { 168 struct iscsi_iser_task *iser_task = task->dd_data; 169 170 if (iser_initialize_task_headers(task, &iser_task->desc)) 171 return -ENOMEM; 172 173 /* mgmt task */ 174 if (!task->sc) 175 return 0; 176 177 iser_task->command_sent = 0; 178 iser_task_rdma_init(iser_task); 179 return 0; 180 } 181 182 /** 183 * iscsi_iser_mtask_xmit - xmit management(immediate) task 184 * @conn: iscsi connection 185 * @task: task management task 186 * 187 * Notes: 188 * The function can return -EAGAIN in which case caller must 189 * call it again later, or recover. '0' return code means successful 190 * xmit. 191 * 192 **/ 193 static int 194 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 195 { 196 int error = 0; 197 198 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); 199 200 error = iser_send_control(conn, task); 201 202 /* since iser xmits control with zero copy, tasks can not be recycled 203 * right after sending them. 204 * The recycling scheme is based on whether a response is expected 205 * - if yes, the task is recycled at iscsi_complete_pdu 206 * - if no, the task is recycled at iser_snd_completion 207 */ 208 return error; 209 } 210 211 static int 212 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 213 struct iscsi_task *task) 214 { 215 struct iscsi_r2t_info *r2t = &task->unsol_r2t; 216 struct iscsi_data hdr; 217 int error = 0; 218 219 /* Send data-out PDUs while there's still unsolicited data to send */ 220 while (iscsi_task_has_unsol_data(task)) { 221 iscsi_prep_data_out_pdu(task, r2t, &hdr); 222 iser_dbg("Sending data-out: itt 0x%x, data count %d\n", 223 hdr.itt, r2t->data_count); 224 225 /* the buffer description has been passed with the command */ 226 /* Send the command */ 227 error = iser_send_data_out(conn, task, &hdr); 228 if (error) { 229 r2t->datasn--; 230 goto iscsi_iser_task_xmit_unsol_data_exit; 231 } 232 r2t->sent += r2t->data_count; 233 iser_dbg("Need to send %d more as data-out PDUs\n", 234 r2t->data_length - r2t->sent); 235 } 236 237 iscsi_iser_task_xmit_unsol_data_exit: 238 return error; 239 } 240 241 static int 242 iscsi_iser_task_xmit(struct iscsi_task *task) 243 { 244 struct iscsi_conn *conn = task->conn; 245 struct iscsi_iser_task *iser_task = task->dd_data; 246 int error = 0; 247 248 if (!task->sc) 249 return iscsi_iser_mtask_xmit(conn, task); 250 251 if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 252 BUG_ON(scsi_bufflen(task->sc) == 0); 253 254 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", 255 task->itt, scsi_bufflen(task->sc), 256 task->imm_count, task->unsol_r2t.data_length); 257 } 258 259 iser_dbg("ctask xmit [cid %d itt 0x%x]\n", 260 conn->id, task->itt); 261 262 /* Send the cmd PDU */ 263 if (!iser_task->command_sent) { 264 error = iser_send_command(conn, task); 265 if (error) 266 goto iscsi_iser_task_xmit_exit; 267 iser_task->command_sent = 1; 268 } 269 270 /* Send unsolicited data-out PDU(s) if necessary */ 271 if (iscsi_task_has_unsol_data(task)) 272 error = iscsi_iser_task_xmit_unsol_data(conn, task); 273 274 iscsi_iser_task_xmit_exit: 275 return error; 276 } 277 278 static void iscsi_iser_cleanup_task(struct iscsi_task *task) 279 { 280 struct iscsi_iser_task *iser_task = task->dd_data; 281 struct iser_tx_desc *tx_desc = &iser_task->desc; 282 283 struct iscsi_iser_conn *iser_conn = task->conn->dd_data; 284 struct iser_device *device = iser_conn->ib_conn->device; 285 286 ib_dma_unmap_single(device->ib_device, 287 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 288 289 /* mgmt tasks do not need special cleanup */ 290 if (!task->sc) 291 return; 292 293 if (iser_task->status == ISER_TASK_STATUS_STARTED) { 294 iser_task->status = ISER_TASK_STATUS_COMPLETED; 295 iser_task_rdma_finalize(iser_task); 296 } 297 } 298 299 static struct iscsi_cls_conn * 300 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 301 { 302 struct iscsi_conn *conn; 303 struct iscsi_cls_conn *cls_conn; 304 struct iscsi_iser_conn *iser_conn; 305 306 cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); 307 if (!cls_conn) 308 return NULL; 309 conn = cls_conn->dd_data; 310 311 /* 312 * due to issues with the login code re iser sematics 313 * this not set in iscsi_conn_setup - FIXME 314 */ 315 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; 316 317 iser_conn = conn->dd_data; 318 conn->dd_data = iser_conn; 319 iser_conn->iscsi_conn = conn; 320 321 return cls_conn; 322 } 323 324 static void 325 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) 326 { 327 struct iscsi_conn *conn = cls_conn->dd_data; 328 struct iscsi_iser_conn *iser_conn = conn->dd_data; 329 struct iser_conn *ib_conn = iser_conn->ib_conn; 330 331 iscsi_conn_teardown(cls_conn); 332 /* 333 * Userspace will normally call the stop callback and 334 * already have freed the ib_conn, but if it goofed up then 335 * we free it here. 336 */ 337 if (ib_conn) { 338 ib_conn->iser_conn = NULL; 339 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ 340 } 341 } 342 343 static int 344 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 345 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, 346 int is_leading) 347 { 348 struct iscsi_conn *conn = cls_conn->dd_data; 349 struct iscsi_iser_conn *iser_conn; 350 struct iser_conn *ib_conn; 351 struct iscsi_endpoint *ep; 352 int error; 353 354 error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 355 if (error) 356 return error; 357 358 /* the transport ep handle comes from user space so it must be 359 * verified against the global ib connections list */ 360 ep = iscsi_lookup_endpoint(transport_eph); 361 if (!ep) { 362 iser_err("can't bind eph %llx\n", 363 (unsigned long long)transport_eph); 364 return -EINVAL; 365 } 366 ib_conn = ep->dd_data; 367 368 if (iser_alloc_rx_descriptors(ib_conn)) 369 return -ENOMEM; 370 371 /* binds the iSER connection retrieved from the previously 372 * connected ep_handle to the iSCSI layer connection. exchanges 373 * connection pointers */ 374 iser_info("binding iscsi/iser conn %p %p to ib_conn %p\n", 375 conn, conn->dd_data, ib_conn); 376 iser_conn = conn->dd_data; 377 ib_conn->iser_conn = iser_conn; 378 iser_conn->ib_conn = ib_conn; 379 iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */ 380 return 0; 381 } 382 383 static void 384 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 385 { 386 struct iscsi_conn *conn = cls_conn->dd_data; 387 struct iscsi_iser_conn *iser_conn = conn->dd_data; 388 struct iser_conn *ib_conn = iser_conn->ib_conn; 389 390 /* 391 * Userspace may have goofed up and not bound the connection or 392 * might have only partially setup the connection. 393 */ 394 if (ib_conn) { 395 iscsi_conn_stop(cls_conn, flag); 396 /* 397 * There is no unbind event so the stop callback 398 * must release the ref from the bind. 399 */ 400 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ 401 } 402 iser_conn->ib_conn = NULL; 403 } 404 405 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 406 { 407 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 408 409 iscsi_session_teardown(cls_session); 410 iscsi_host_remove(shost); 411 iscsi_host_free(shost); 412 } 413 414 static struct iscsi_cls_session * 415 iscsi_iser_session_create(struct iscsi_endpoint *ep, 416 uint16_t cmds_max, uint16_t qdepth, 417 uint32_t initial_cmdsn) 418 { 419 struct iscsi_cls_session *cls_session; 420 struct iscsi_session *session; 421 struct Scsi_Host *shost; 422 struct iser_conn *ib_conn; 423 424 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); 425 if (!shost) 426 return NULL; 427 shost->transportt = iscsi_iser_scsi_transport; 428 shost->max_lun = iscsi_max_lun; 429 shost->max_id = 0; 430 shost->max_channel = 0; 431 shost->max_cmd_len = 16; 432 433 /* 434 * older userspace tools (before 2.0-870) did not pass us 435 * the leading conn's ep so this will be NULL; 436 */ 437 if (ep) 438 ib_conn = ep->dd_data; 439 440 if (iscsi_host_add(shost, 441 ep ? ib_conn->device->ib_device->dma_device : NULL)) 442 goto free_host; 443 444 /* 445 * we do not support setting can_queue cmd_per_lun from userspace yet 446 * because we preallocate so many resources 447 */ 448 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 449 ISCSI_DEF_XMIT_CMDS_MAX, 0, 450 sizeof(struct iscsi_iser_task), 451 initial_cmdsn, 0); 452 if (!cls_session) 453 goto remove_host; 454 session = cls_session->dd_data; 455 456 shost->can_queue = session->scsi_cmds_max; 457 return cls_session; 458 459 remove_host: 460 iscsi_host_remove(shost); 461 free_host: 462 iscsi_host_free(shost); 463 return NULL; 464 } 465 466 static int 467 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 468 enum iscsi_param param, char *buf, int buflen) 469 { 470 int value; 471 472 switch (param) { 473 case ISCSI_PARAM_MAX_RECV_DLENGTH: 474 /* TBD */ 475 break; 476 case ISCSI_PARAM_HDRDGST_EN: 477 sscanf(buf, "%d", &value); 478 if (value) { 479 iser_err("DataDigest wasn't negotiated to None"); 480 return -EPROTO; 481 } 482 break; 483 case ISCSI_PARAM_DATADGST_EN: 484 sscanf(buf, "%d", &value); 485 if (value) { 486 iser_err("DataDigest wasn't negotiated to None"); 487 return -EPROTO; 488 } 489 break; 490 case ISCSI_PARAM_IFMARKER_EN: 491 sscanf(buf, "%d", &value); 492 if (value) { 493 iser_err("IFMarker wasn't negotiated to No"); 494 return -EPROTO; 495 } 496 break; 497 case ISCSI_PARAM_OFMARKER_EN: 498 sscanf(buf, "%d", &value); 499 if (value) { 500 iser_err("OFMarker wasn't negotiated to No"); 501 return -EPROTO; 502 } 503 break; 504 default: 505 return iscsi_set_param(cls_conn, param, buf, buflen); 506 } 507 508 return 0; 509 } 510 511 static void 512 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 513 { 514 struct iscsi_conn *conn = cls_conn->dd_data; 515 516 stats->txdata_octets = conn->txdata_octets; 517 stats->rxdata_octets = conn->rxdata_octets; 518 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 519 stats->dataout_pdus = conn->dataout_pdus_cnt; 520 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 521 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 522 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 523 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 524 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 525 stats->custom_length = 4; 526 strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 527 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 528 strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 529 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 530 strcpy(stats->custom[2].desc, "eh_abort_cnt"); 531 stats->custom[2].value = conn->eh_abort_cnt; 532 strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 533 stats->custom[3].value = conn->fmr_unalign_cnt; 534 } 535 536 static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, 537 enum iscsi_param param, char *buf) 538 { 539 struct iser_conn *ib_conn = ep->dd_data; 540 int len; 541 542 switch (param) { 543 case ISCSI_PARAM_CONN_PORT: 544 case ISCSI_PARAM_CONN_ADDRESS: 545 if (!ib_conn || !ib_conn->cma_id) 546 return -ENOTCONN; 547 548 return iscsi_conn_get_addr_param((struct sockaddr_storage *) 549 &ib_conn->cma_id->route.addr.dst_addr, 550 param, buf); 551 break; 552 default: 553 return -ENOSYS; 554 } 555 556 return len; 557 } 558 559 static struct iscsi_endpoint * 560 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, 561 int non_blocking) 562 { 563 int err; 564 struct iser_conn *ib_conn; 565 struct iscsi_endpoint *ep; 566 567 ep = iscsi_create_endpoint(sizeof(*ib_conn)); 568 if (!ep) 569 return ERR_PTR(-ENOMEM); 570 571 ib_conn = ep->dd_data; 572 ib_conn->ep = ep; 573 iser_conn_init(ib_conn); 574 575 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, 576 non_blocking); 577 if (err) 578 return ERR_PTR(err); 579 580 return ep; 581 } 582 583 static int 584 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 585 { 586 struct iser_conn *ib_conn; 587 int rc; 588 589 ib_conn = ep->dd_data; 590 rc = wait_event_interruptible_timeout(ib_conn->wait, 591 ib_conn->state == ISER_CONN_UP, 592 msecs_to_jiffies(timeout_ms)); 593 594 /* if conn establishment failed, return error code to iscsi */ 595 if (!rc && 596 (ib_conn->state == ISER_CONN_TERMINATING || 597 ib_conn->state == ISER_CONN_DOWN)) 598 rc = -1; 599 600 iser_info("ib conn %p rc = %d\n", ib_conn, rc); 601 602 if (rc > 0) 603 return 1; /* success, this is the equivalent of POLLOUT */ 604 else if (!rc) 605 return 0; /* timeout */ 606 else 607 return rc; /* signal */ 608 } 609 610 static void 611 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 612 { 613 struct iser_conn *ib_conn; 614 615 ib_conn = ep->dd_data; 616 if (ib_conn->iser_conn) 617 /* 618 * Must suspend xmit path if the ep is bound to the 619 * iscsi_conn, so we know we are not accessing the ib_conn 620 * when we free it. 621 * 622 * This may not be bound if the ep poll failed. 623 */ 624 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); 625 626 627 iser_info("ib conn %p state %d\n", ib_conn, ib_conn->state); 628 iser_conn_terminate(ib_conn); 629 } 630 631 static umode_t iser_attr_is_visible(int param_type, int param) 632 { 633 switch (param_type) { 634 case ISCSI_HOST_PARAM: 635 switch (param) { 636 case ISCSI_HOST_PARAM_NETDEV_NAME: 637 case ISCSI_HOST_PARAM_HWADDRESS: 638 case ISCSI_HOST_PARAM_INITIATOR_NAME: 639 return S_IRUGO; 640 default: 641 return 0; 642 } 643 case ISCSI_PARAM: 644 switch (param) { 645 case ISCSI_PARAM_MAX_RECV_DLENGTH: 646 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 647 case ISCSI_PARAM_HDRDGST_EN: 648 case ISCSI_PARAM_DATADGST_EN: 649 case ISCSI_PARAM_CONN_ADDRESS: 650 case ISCSI_PARAM_CONN_PORT: 651 case ISCSI_PARAM_EXP_STATSN: 652 case ISCSI_PARAM_PERSISTENT_ADDRESS: 653 case ISCSI_PARAM_PERSISTENT_PORT: 654 case ISCSI_PARAM_PING_TMO: 655 case ISCSI_PARAM_RECV_TMO: 656 case ISCSI_PARAM_INITIAL_R2T_EN: 657 case ISCSI_PARAM_MAX_R2T: 658 case ISCSI_PARAM_IMM_DATA_EN: 659 case ISCSI_PARAM_FIRST_BURST: 660 case ISCSI_PARAM_MAX_BURST: 661 case ISCSI_PARAM_PDU_INORDER_EN: 662 case ISCSI_PARAM_DATASEQ_INORDER_EN: 663 case ISCSI_PARAM_TARGET_NAME: 664 case ISCSI_PARAM_TPGT: 665 case ISCSI_PARAM_USERNAME: 666 case ISCSI_PARAM_PASSWORD: 667 case ISCSI_PARAM_USERNAME_IN: 668 case ISCSI_PARAM_PASSWORD_IN: 669 case ISCSI_PARAM_FAST_ABORT: 670 case ISCSI_PARAM_ABORT_TMO: 671 case ISCSI_PARAM_LU_RESET_TMO: 672 case ISCSI_PARAM_TGT_RESET_TMO: 673 case ISCSI_PARAM_IFACE_NAME: 674 case ISCSI_PARAM_INITIATOR_NAME: 675 return S_IRUGO; 676 default: 677 return 0; 678 } 679 } 680 681 return 0; 682 } 683 684 static struct scsi_host_template iscsi_iser_sht = { 685 .module = THIS_MODULE, 686 .name = "iSCSI Initiator over iSER", 687 .queuecommand = iscsi_queuecommand, 688 .change_queue_depth = iscsi_change_queue_depth, 689 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 690 .max_sectors = 1024, 691 .cmd_per_lun = ISER_DEF_CMD_PER_LUN, 692 .eh_abort_handler = iscsi_eh_abort, 693 .eh_device_reset_handler= iscsi_eh_device_reset, 694 .eh_target_reset_handler = iscsi_eh_recover_target, 695 .target_alloc = iscsi_target_alloc, 696 .use_clustering = DISABLE_CLUSTERING, 697 .proc_name = "iscsi_iser", 698 .this_id = -1, 699 }; 700 701 static struct iscsi_transport iscsi_iser_transport = { 702 .owner = THIS_MODULE, 703 .name = "iser", 704 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, 705 /* session management */ 706 .create_session = iscsi_iser_session_create, 707 .destroy_session = iscsi_iser_session_destroy, 708 /* connection management */ 709 .create_conn = iscsi_iser_conn_create, 710 .bind_conn = iscsi_iser_conn_bind, 711 .destroy_conn = iscsi_iser_conn_destroy, 712 .attr_is_visible = iser_attr_is_visible, 713 .set_param = iscsi_iser_set_param, 714 .get_conn_param = iscsi_conn_get_param, 715 .get_ep_param = iscsi_iser_get_ep_param, 716 .get_session_param = iscsi_session_get_param, 717 .start_conn = iscsi_conn_start, 718 .stop_conn = iscsi_iser_conn_stop, 719 /* iscsi host params */ 720 .get_host_param = iscsi_host_get_param, 721 .set_host_param = iscsi_host_set_param, 722 /* IO */ 723 .send_pdu = iscsi_conn_send_pdu, 724 .get_stats = iscsi_iser_conn_get_stats, 725 .init_task = iscsi_iser_task_init, 726 .xmit_task = iscsi_iser_task_xmit, 727 .cleanup_task = iscsi_iser_cleanup_task, 728 .alloc_pdu = iscsi_iser_pdu_alloc, 729 /* recovery */ 730 .session_recovery_timedout = iscsi_session_recovery_timedout, 731 732 .ep_connect = iscsi_iser_ep_connect, 733 .ep_poll = iscsi_iser_ep_poll, 734 .ep_disconnect = iscsi_iser_ep_disconnect 735 }; 736 737 static int __init iser_init(void) 738 { 739 int err; 740 741 iser_dbg("Starting iSER datamover...\n"); 742 743 if (iscsi_max_lun < 1) { 744 iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); 745 return -EINVAL; 746 } 747 748 memset(&ig, 0, sizeof(struct iser_global)); 749 750 ig.desc_cache = kmem_cache_create("iser_descriptors", 751 sizeof(struct iser_tx_desc), 752 0, SLAB_HWCACHE_ALIGN, 753 NULL); 754 if (ig.desc_cache == NULL) 755 return -ENOMEM; 756 757 /* device init is called only after the first addr resolution */ 758 mutex_init(&ig.device_list_mutex); 759 INIT_LIST_HEAD(&ig.device_list); 760 mutex_init(&ig.connlist_mutex); 761 INIT_LIST_HEAD(&ig.connlist); 762 763 iscsi_iser_scsi_transport = iscsi_register_transport( 764 &iscsi_iser_transport); 765 if (!iscsi_iser_scsi_transport) { 766 iser_err("iscsi_register_transport failed\n"); 767 err = -EINVAL; 768 goto register_transport_failure; 769 } 770 771 return 0; 772 773 register_transport_failure: 774 kmem_cache_destroy(ig.desc_cache); 775 776 return err; 777 } 778 779 static void __exit iser_exit(void) 780 { 781 iser_dbg("Removing iSER datamover...\n"); 782 iscsi_unregister_transport(&iscsi_iser_transport); 783 kmem_cache_destroy(ig.desc_cache); 784 } 785 786 module_init(iser_init); 787 module_exit(iser_exit); 788