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 iscsi_session *session; 351 struct iser_conn *ib_conn; 352 struct iscsi_endpoint *ep; 353 int error; 354 355 error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 356 if (error) 357 return error; 358 359 /* the transport ep handle comes from user space so it must be 360 * verified against the global ib connections list */ 361 ep = iscsi_lookup_endpoint(transport_eph); 362 if (!ep) { 363 iser_err("can't bind eph %llx\n", 364 (unsigned long long)transport_eph); 365 return -EINVAL; 366 } 367 ib_conn = ep->dd_data; 368 369 session = conn->session; 370 if (iser_alloc_rx_descriptors(ib_conn, session)) 371 return -ENOMEM; 372 373 /* binds the iSER connection retrieved from the previously 374 * connected ep_handle to the iSCSI layer connection. exchanges 375 * connection pointers */ 376 iser_info("binding iscsi/iser conn %p %p to ib_conn %p\n", 377 conn, conn->dd_data, ib_conn); 378 iser_conn = conn->dd_data; 379 ib_conn->iser_conn = iser_conn; 380 iser_conn->ib_conn = ib_conn; 381 iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */ 382 return 0; 383 } 384 385 static void 386 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 387 { 388 struct iscsi_conn *conn = cls_conn->dd_data; 389 struct iscsi_iser_conn *iser_conn = conn->dd_data; 390 struct iser_conn *ib_conn = iser_conn->ib_conn; 391 392 /* 393 * Userspace may have goofed up and not bound the connection or 394 * might have only partially setup the connection. 395 */ 396 if (ib_conn) { 397 iscsi_conn_stop(cls_conn, flag); 398 /* 399 * There is no unbind event so the stop callback 400 * must release the ref from the bind. 401 */ 402 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ 403 } 404 iser_conn->ib_conn = NULL; 405 } 406 407 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 408 { 409 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 410 411 iscsi_session_teardown(cls_session); 412 iscsi_host_remove(shost); 413 iscsi_host_free(shost); 414 } 415 416 static struct iscsi_cls_session * 417 iscsi_iser_session_create(struct iscsi_endpoint *ep, 418 uint16_t cmds_max, uint16_t qdepth, 419 uint32_t initial_cmdsn) 420 { 421 struct iscsi_cls_session *cls_session; 422 struct iscsi_session *session; 423 struct Scsi_Host *shost; 424 struct iser_conn *ib_conn = NULL; 425 426 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); 427 if (!shost) 428 return NULL; 429 shost->transportt = iscsi_iser_scsi_transport; 430 shost->cmd_per_lun = qdepth; 431 shost->max_lun = iscsi_max_lun; 432 shost->max_id = 0; 433 shost->max_channel = 0; 434 shost->max_cmd_len = 16; 435 436 /* 437 * older userspace tools (before 2.0-870) did not pass us 438 * the leading conn's ep so this will be NULL; 439 */ 440 if (ep) 441 ib_conn = ep->dd_data; 442 443 if (iscsi_host_add(shost, 444 ep ? ib_conn->device->ib_device->dma_device : NULL)) 445 goto free_host; 446 447 if (cmds_max > ISER_DEF_XMIT_CMDS_MAX) { 448 iser_info("cmds_max changed from %u to %u\n", 449 cmds_max, ISER_DEF_XMIT_CMDS_MAX); 450 cmds_max = ISER_DEF_XMIT_CMDS_MAX; 451 } 452 453 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 454 cmds_max, 0, 455 sizeof(struct iscsi_iser_task), 456 initial_cmdsn, 0); 457 if (!cls_session) 458 goto remove_host; 459 session = cls_session->dd_data; 460 461 shost->can_queue = session->scsi_cmds_max; 462 return cls_session; 463 464 remove_host: 465 iscsi_host_remove(shost); 466 free_host: 467 iscsi_host_free(shost); 468 return NULL; 469 } 470 471 static int 472 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 473 enum iscsi_param param, char *buf, int buflen) 474 { 475 int value; 476 477 switch (param) { 478 case ISCSI_PARAM_MAX_RECV_DLENGTH: 479 /* TBD */ 480 break; 481 case ISCSI_PARAM_HDRDGST_EN: 482 sscanf(buf, "%d", &value); 483 if (value) { 484 iser_err("DataDigest wasn't negotiated to None"); 485 return -EPROTO; 486 } 487 break; 488 case ISCSI_PARAM_DATADGST_EN: 489 sscanf(buf, "%d", &value); 490 if (value) { 491 iser_err("DataDigest wasn't negotiated to None"); 492 return -EPROTO; 493 } 494 break; 495 case ISCSI_PARAM_IFMARKER_EN: 496 sscanf(buf, "%d", &value); 497 if (value) { 498 iser_err("IFMarker wasn't negotiated to No"); 499 return -EPROTO; 500 } 501 break; 502 case ISCSI_PARAM_OFMARKER_EN: 503 sscanf(buf, "%d", &value); 504 if (value) { 505 iser_err("OFMarker wasn't negotiated to No"); 506 return -EPROTO; 507 } 508 break; 509 default: 510 return iscsi_set_param(cls_conn, param, buf, buflen); 511 } 512 513 return 0; 514 } 515 516 static void 517 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 518 { 519 struct iscsi_conn *conn = cls_conn->dd_data; 520 521 stats->txdata_octets = conn->txdata_octets; 522 stats->rxdata_octets = conn->rxdata_octets; 523 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 524 stats->dataout_pdus = conn->dataout_pdus_cnt; 525 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 526 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 527 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 528 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 529 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 530 stats->custom_length = 4; 531 strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 532 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 533 strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 534 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 535 strcpy(stats->custom[2].desc, "eh_abort_cnt"); 536 stats->custom[2].value = conn->eh_abort_cnt; 537 strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 538 stats->custom[3].value = conn->fmr_unalign_cnt; 539 } 540 541 static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, 542 enum iscsi_param param, char *buf) 543 { 544 struct iser_conn *ib_conn = ep->dd_data; 545 int len; 546 547 switch (param) { 548 case ISCSI_PARAM_CONN_PORT: 549 case ISCSI_PARAM_CONN_ADDRESS: 550 if (!ib_conn || !ib_conn->cma_id) 551 return -ENOTCONN; 552 553 return iscsi_conn_get_addr_param((struct sockaddr_storage *) 554 &ib_conn->cma_id->route.addr.dst_addr, 555 param, buf); 556 break; 557 default: 558 return -ENOSYS; 559 } 560 561 return len; 562 } 563 564 static struct iscsi_endpoint * 565 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, 566 int non_blocking) 567 { 568 int err; 569 struct iser_conn *ib_conn; 570 struct iscsi_endpoint *ep; 571 572 ep = iscsi_create_endpoint(sizeof(*ib_conn)); 573 if (!ep) 574 return ERR_PTR(-ENOMEM); 575 576 ib_conn = ep->dd_data; 577 ib_conn->ep = ep; 578 iser_conn_init(ib_conn); 579 580 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, 581 non_blocking); 582 if (err) 583 return ERR_PTR(err); 584 585 return ep; 586 } 587 588 static int 589 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 590 { 591 struct iser_conn *ib_conn; 592 int rc; 593 594 ib_conn = ep->dd_data; 595 rc = wait_event_interruptible_timeout(ib_conn->wait, 596 ib_conn->state == ISER_CONN_UP, 597 msecs_to_jiffies(timeout_ms)); 598 599 /* if conn establishment failed, return error code to iscsi */ 600 if (!rc && 601 (ib_conn->state == ISER_CONN_TERMINATING || 602 ib_conn->state == ISER_CONN_DOWN)) 603 rc = -1; 604 605 iser_info("ib conn %p rc = %d\n", ib_conn, rc); 606 607 if (rc > 0) 608 return 1; /* success, this is the equivalent of POLLOUT */ 609 else if (!rc) 610 return 0; /* timeout */ 611 else 612 return rc; /* signal */ 613 } 614 615 static void 616 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 617 { 618 struct iser_conn *ib_conn; 619 620 ib_conn = ep->dd_data; 621 if (ib_conn->iser_conn) 622 /* 623 * Must suspend xmit path if the ep is bound to the 624 * iscsi_conn, so we know we are not accessing the ib_conn 625 * when we free it. 626 * 627 * This may not be bound if the ep poll failed. 628 */ 629 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); 630 631 632 iser_info("ib conn %p state %d\n", ib_conn, ib_conn->state); 633 iser_conn_terminate(ib_conn); 634 } 635 636 static umode_t iser_attr_is_visible(int param_type, int param) 637 { 638 switch (param_type) { 639 case ISCSI_HOST_PARAM: 640 switch (param) { 641 case ISCSI_HOST_PARAM_NETDEV_NAME: 642 case ISCSI_HOST_PARAM_HWADDRESS: 643 case ISCSI_HOST_PARAM_INITIATOR_NAME: 644 return S_IRUGO; 645 default: 646 return 0; 647 } 648 case ISCSI_PARAM: 649 switch (param) { 650 case ISCSI_PARAM_MAX_RECV_DLENGTH: 651 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 652 case ISCSI_PARAM_HDRDGST_EN: 653 case ISCSI_PARAM_DATADGST_EN: 654 case ISCSI_PARAM_CONN_ADDRESS: 655 case ISCSI_PARAM_CONN_PORT: 656 case ISCSI_PARAM_EXP_STATSN: 657 case ISCSI_PARAM_PERSISTENT_ADDRESS: 658 case ISCSI_PARAM_PERSISTENT_PORT: 659 case ISCSI_PARAM_PING_TMO: 660 case ISCSI_PARAM_RECV_TMO: 661 case ISCSI_PARAM_INITIAL_R2T_EN: 662 case ISCSI_PARAM_MAX_R2T: 663 case ISCSI_PARAM_IMM_DATA_EN: 664 case ISCSI_PARAM_FIRST_BURST: 665 case ISCSI_PARAM_MAX_BURST: 666 case ISCSI_PARAM_PDU_INORDER_EN: 667 case ISCSI_PARAM_DATASEQ_INORDER_EN: 668 case ISCSI_PARAM_TARGET_NAME: 669 case ISCSI_PARAM_TPGT: 670 case ISCSI_PARAM_USERNAME: 671 case ISCSI_PARAM_PASSWORD: 672 case ISCSI_PARAM_USERNAME_IN: 673 case ISCSI_PARAM_PASSWORD_IN: 674 case ISCSI_PARAM_FAST_ABORT: 675 case ISCSI_PARAM_ABORT_TMO: 676 case ISCSI_PARAM_LU_RESET_TMO: 677 case ISCSI_PARAM_TGT_RESET_TMO: 678 case ISCSI_PARAM_IFACE_NAME: 679 case ISCSI_PARAM_INITIATOR_NAME: 680 case ISCSI_PARAM_DISCOVERY_SESS: 681 return S_IRUGO; 682 default: 683 return 0; 684 } 685 } 686 687 return 0; 688 } 689 690 static struct scsi_host_template iscsi_iser_sht = { 691 .module = THIS_MODULE, 692 .name = "iSCSI Initiator over iSER", 693 .queuecommand = iscsi_queuecommand, 694 .change_queue_depth = iscsi_change_queue_depth, 695 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 696 .max_sectors = 1024, 697 .cmd_per_lun = ISER_DEF_CMD_PER_LUN, 698 .eh_abort_handler = iscsi_eh_abort, 699 .eh_device_reset_handler= iscsi_eh_device_reset, 700 .eh_target_reset_handler = iscsi_eh_recover_target, 701 .target_alloc = iscsi_target_alloc, 702 .use_clustering = DISABLE_CLUSTERING, 703 .proc_name = "iscsi_iser", 704 .this_id = -1, 705 }; 706 707 static struct iscsi_transport iscsi_iser_transport = { 708 .owner = THIS_MODULE, 709 .name = "iser", 710 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO, 711 /* session management */ 712 .create_session = iscsi_iser_session_create, 713 .destroy_session = iscsi_iser_session_destroy, 714 /* connection management */ 715 .create_conn = iscsi_iser_conn_create, 716 .bind_conn = iscsi_iser_conn_bind, 717 .destroy_conn = iscsi_iser_conn_destroy, 718 .attr_is_visible = iser_attr_is_visible, 719 .set_param = iscsi_iser_set_param, 720 .get_conn_param = iscsi_conn_get_param, 721 .get_ep_param = iscsi_iser_get_ep_param, 722 .get_session_param = iscsi_session_get_param, 723 .start_conn = iscsi_conn_start, 724 .stop_conn = iscsi_iser_conn_stop, 725 /* iscsi host params */ 726 .get_host_param = iscsi_host_get_param, 727 .set_host_param = iscsi_host_set_param, 728 /* IO */ 729 .send_pdu = iscsi_conn_send_pdu, 730 .get_stats = iscsi_iser_conn_get_stats, 731 .init_task = iscsi_iser_task_init, 732 .xmit_task = iscsi_iser_task_xmit, 733 .cleanup_task = iscsi_iser_cleanup_task, 734 .alloc_pdu = iscsi_iser_pdu_alloc, 735 /* recovery */ 736 .session_recovery_timedout = iscsi_session_recovery_timedout, 737 738 .ep_connect = iscsi_iser_ep_connect, 739 .ep_poll = iscsi_iser_ep_poll, 740 .ep_disconnect = iscsi_iser_ep_disconnect 741 }; 742 743 static int __init iser_init(void) 744 { 745 int err; 746 747 iser_dbg("Starting iSER datamover...\n"); 748 749 if (iscsi_max_lun < 1) { 750 iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); 751 return -EINVAL; 752 } 753 754 memset(&ig, 0, sizeof(struct iser_global)); 755 756 ig.desc_cache = kmem_cache_create("iser_descriptors", 757 sizeof(struct iser_tx_desc), 758 0, SLAB_HWCACHE_ALIGN, 759 NULL); 760 if (ig.desc_cache == NULL) 761 return -ENOMEM; 762 763 /* device init is called only after the first addr resolution */ 764 mutex_init(&ig.device_list_mutex); 765 INIT_LIST_HEAD(&ig.device_list); 766 mutex_init(&ig.connlist_mutex); 767 INIT_LIST_HEAD(&ig.connlist); 768 769 iscsi_iser_scsi_transport = iscsi_register_transport( 770 &iscsi_iser_transport); 771 if (!iscsi_iser_scsi_transport) { 772 iser_err("iscsi_register_transport failed\n"); 773 err = -EINVAL; 774 goto register_transport_failure; 775 } 776 777 return 0; 778 779 register_transport_failure: 780 kmem_cache_destroy(ig.desc_cache); 781 782 return err; 783 } 784 785 static void __exit iser_exit(void) 786 { 787 iser_dbg("Removing iSER datamover...\n"); 788 iscsi_unregister_transport(&iscsi_iser_transport); 789 kmem_cache_destroy(ig.desc_cache); 790 } 791 792 module_init(iser_init); 793 module_exit(iser_exit); 794