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 * maintained by openib-general@openib.org 9 * 10 * This software is available to you under a choice of one of two 11 * licenses. You may choose to be licensed under the terms of the GNU 12 * General Public License (GPL) Version 2, available from the file 13 * COPYING in the main directory of this source tree, or the 14 * OpenIB.org BSD license below: 15 * 16 * Redistribution and use in source and binary forms, with or 17 * without modification, are permitted provided that the following 18 * conditions are met: 19 * 20 * - Redistributions of source code must retain the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer. 23 * 24 * - Redistributions in binary form must reproduce the above 25 * copyright notice, this list of conditions and the following 26 * disclaimer in the documentation and/or other materials 27 * provided with the distribution. 28 * 29 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 30 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 31 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 32 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 33 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 34 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 35 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 36 * SOFTWARE. 37 * 38 * Credits: 39 * Christoph Hellwig 40 * FUJITA Tomonori 41 * Arne Redlich 42 * Zhenyu Wang 43 * Modified by: 44 * Erez Zilber 45 */ 46 47 #include <linux/types.h> 48 #include <linux/list.h> 49 #include <linux/hardirq.h> 50 #include <linux/kfifo.h> 51 #include <linux/blkdev.h> 52 #include <linux/init.h> 53 #include <linux/ioctl.h> 54 #include <linux/cdev.h> 55 #include <linux/in.h> 56 #include <linux/net.h> 57 #include <linux/scatterlist.h> 58 #include <linux/delay.h> 59 #include <linux/slab.h> 60 #include <linux/module.h> 61 62 #include <net/sock.h> 63 64 #include <asm/uaccess.h> 65 66 #include <scsi/scsi_cmnd.h> 67 #include <scsi/scsi_device.h> 68 #include <scsi/scsi_eh.h> 69 #include <scsi/scsi_tcq.h> 70 #include <scsi/scsi_host.h> 71 #include <scsi/scsi.h> 72 #include <scsi/scsi_transport_iscsi.h> 73 74 #include "iscsi_iser.h" 75 76 static struct scsi_host_template iscsi_iser_sht; 77 static struct iscsi_transport iscsi_iser_transport; 78 static struct scsi_transport_template *iscsi_iser_scsi_transport; 79 80 static unsigned int iscsi_max_lun = 512; 81 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); 82 83 int iser_debug_level = 0; 84 85 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover " 86 "v" DRV_VER " (" DRV_DATE ")"); 87 MODULE_LICENSE("Dual BSD/GPL"); 88 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); 89 90 module_param_named(debug_level, iser_debug_level, int, 0644); 91 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); 92 93 struct iser_global ig; 94 95 void 96 iscsi_iser_recv(struct iscsi_conn *conn, 97 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) 98 { 99 int rc = 0; 100 int datalen; 101 int ahslen; 102 103 /* verify PDU length */ 104 datalen = ntoh24(hdr->dlength); 105 if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { 106 iser_err("wrong datalen %d (hdr), %d (IB)\n", 107 datalen, rx_data_len); 108 rc = ISCSI_ERR_DATALEN; 109 goto error; 110 } 111 112 if (datalen != rx_data_len) 113 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", 114 datalen, rx_data_len); 115 116 /* read AHS */ 117 ahslen = hdr->hlength * 4; 118 119 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 120 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 121 goto error; 122 123 return; 124 error: 125 iscsi_conn_failure(conn, rc); 126 } 127 128 static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) 129 { 130 struct iscsi_iser_task *iser_task = task->dd_data; 131 132 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; 133 task->hdr_max = sizeof(iser_task->desc.iscsi_header); 134 return 0; 135 } 136 137 int iser_initialize_task_headers(struct iscsi_task *task, 138 struct iser_tx_desc *tx_desc) 139 { 140 struct iscsi_iser_conn *iser_conn = task->conn->dd_data; 141 struct iser_device *device = iser_conn->ib_conn->device; 142 struct iscsi_iser_task *iser_task = task->dd_data; 143 u64 dma_addr; 144 145 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, 146 ISER_HEADERS_LEN, DMA_TO_DEVICE); 147 if (ib_dma_mapping_error(device->ib_device, dma_addr)) 148 return -ENOMEM; 149 150 tx_desc->dma_addr = dma_addr; 151 tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 152 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 153 tx_desc->tx_sg[0].lkey = device->mr->lkey; 154 155 iser_task->headers_initialized = 1; 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_task->headers_initialized) 171 if (iser_initialize_task_headers(task, &iser_task->desc)) 172 return -ENOMEM; 173 174 /* mgmt task */ 175 if (!task->sc) 176 return 0; 177 178 iser_task->command_sent = 0; 179 iser_task_rdma_init(iser_task); 180 return 0; 181 } 182 183 /** 184 * iscsi_iser_mtask_xmit - xmit management(immediate) task 185 * @conn: iscsi connection 186 * @task: task management task 187 * 188 * Notes: 189 * The function can return -EAGAIN in which case caller must 190 * call it again later, or recover. '0' return code means successful 191 * xmit. 192 * 193 **/ 194 static int 195 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 196 { 197 int error = 0; 198 199 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); 200 201 error = iser_send_control(conn, task); 202 203 /* since iser xmits control with zero copy, tasks can not be recycled 204 * right after sending them. 205 * The recycling scheme is based on whether a response is expected 206 * - if yes, the task is recycled at iscsi_complete_pdu 207 * - if no, the task is recycled at iser_snd_completion 208 */ 209 return error; 210 } 211 212 static int 213 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 214 struct iscsi_task *task) 215 { 216 struct iscsi_r2t_info *r2t = &task->unsol_r2t; 217 struct iscsi_data hdr; 218 int error = 0; 219 220 /* Send data-out PDUs while there's still unsolicited data to send */ 221 while (iscsi_task_has_unsol_data(task)) { 222 iscsi_prep_data_out_pdu(task, r2t, &hdr); 223 iser_dbg("Sending data-out: itt 0x%x, data count %d\n", 224 hdr.itt, r2t->data_count); 225 226 /* the buffer description has been passed with the command */ 227 /* Send the command */ 228 error = iser_send_data_out(conn, task, &hdr); 229 if (error) { 230 r2t->datasn--; 231 goto iscsi_iser_task_xmit_unsol_data_exit; 232 } 233 r2t->sent += r2t->data_count; 234 iser_dbg("Need to send %d more as data-out PDUs\n", 235 r2t->data_length - r2t->sent); 236 } 237 238 iscsi_iser_task_xmit_unsol_data_exit: 239 return error; 240 } 241 242 static int 243 iscsi_iser_task_xmit(struct iscsi_task *task) 244 { 245 struct iscsi_conn *conn = task->conn; 246 struct iscsi_iser_task *iser_task = task->dd_data; 247 int error = 0; 248 249 if (!task->sc) 250 return iscsi_iser_mtask_xmit(conn, task); 251 252 if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 253 BUG_ON(scsi_bufflen(task->sc) == 0); 254 255 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", 256 task->itt, scsi_bufflen(task->sc), 257 task->imm_count, task->unsol_r2t.data_length); 258 } 259 260 iser_dbg("ctask xmit [cid %d itt 0x%x]\n", 261 conn->id, task->itt); 262 263 /* Send the cmd PDU */ 264 if (!iser_task->command_sent) { 265 error = iser_send_command(conn, task); 266 if (error) 267 goto iscsi_iser_task_xmit_exit; 268 iser_task->command_sent = 1; 269 } 270 271 /* Send unsolicited data-out PDU(s) if necessary */ 272 if (iscsi_task_has_unsol_data(task)) 273 error = iscsi_iser_task_xmit_unsol_data(conn, task); 274 275 iscsi_iser_task_xmit_exit: 276 return error; 277 } 278 279 static void iscsi_iser_cleanup_task(struct iscsi_task *task) 280 { 281 struct iscsi_iser_task *iser_task = task->dd_data; 282 283 /* mgmt tasks do not need special cleanup */ 284 if (!task->sc) 285 return; 286 287 if (iser_task->status == ISER_TASK_STATUS_STARTED) { 288 iser_task->status = ISER_TASK_STATUS_COMPLETED; 289 iser_task_rdma_finalize(iser_task); 290 } 291 } 292 293 static struct iscsi_cls_conn * 294 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 295 { 296 struct iscsi_conn *conn; 297 struct iscsi_cls_conn *cls_conn; 298 struct iscsi_iser_conn *iser_conn; 299 300 cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); 301 if (!cls_conn) 302 return NULL; 303 conn = cls_conn->dd_data; 304 305 /* 306 * due to issues with the login code re iser sematics 307 * this not set in iscsi_conn_setup - FIXME 308 */ 309 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; 310 311 iser_conn = conn->dd_data; 312 conn->dd_data = iser_conn; 313 iser_conn->iscsi_conn = conn; 314 315 return cls_conn; 316 } 317 318 static void 319 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) 320 { 321 struct iscsi_conn *conn = cls_conn->dd_data; 322 struct iscsi_iser_conn *iser_conn = conn->dd_data; 323 struct iser_conn *ib_conn = iser_conn->ib_conn; 324 325 iscsi_conn_teardown(cls_conn); 326 /* 327 * Userspace will normally call the stop callback and 328 * already have freed the ib_conn, but if it goofed up then 329 * we free it here. 330 */ 331 if (ib_conn) { 332 ib_conn->iser_conn = NULL; 333 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ 334 } 335 } 336 337 static int 338 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 339 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, 340 int is_leading) 341 { 342 struct iscsi_conn *conn = cls_conn->dd_data; 343 struct iscsi_iser_conn *iser_conn; 344 struct iser_conn *ib_conn; 345 struct iscsi_endpoint *ep; 346 int error; 347 348 error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 349 if (error) 350 return error; 351 352 /* the transport ep handle comes from user space so it must be 353 * verified against the global ib connections list */ 354 ep = iscsi_lookup_endpoint(transport_eph); 355 if (!ep) { 356 iser_err("can't bind eph %llx\n", 357 (unsigned long long)transport_eph); 358 return -EINVAL; 359 } 360 ib_conn = ep->dd_data; 361 362 /* binds the iSER connection retrieved from the previously 363 * connected ep_handle to the iSCSI layer connection. exchanges 364 * connection pointers */ 365 iser_err("binding iscsi/iser conn %p %p to ib_conn %p\n", 366 conn, conn->dd_data, ib_conn); 367 iser_conn = conn->dd_data; 368 ib_conn->iser_conn = iser_conn; 369 iser_conn->ib_conn = ib_conn; 370 iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */ 371 return 0; 372 } 373 374 static void 375 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 376 { 377 struct iscsi_conn *conn = cls_conn->dd_data; 378 struct iscsi_iser_conn *iser_conn = conn->dd_data; 379 struct iser_conn *ib_conn = iser_conn->ib_conn; 380 381 /* 382 * Userspace may have goofed up and not bound the connection or 383 * might have only partially setup the connection. 384 */ 385 if (ib_conn) { 386 iscsi_conn_stop(cls_conn, flag); 387 /* 388 * There is no unbind event so the stop callback 389 * must release the ref from the bind. 390 */ 391 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ 392 } 393 iser_conn->ib_conn = NULL; 394 } 395 396 static int 397 iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 398 { 399 struct iscsi_conn *conn = cls_conn->dd_data; 400 int err; 401 402 err = iser_conn_set_full_featured_mode(conn); 403 if (err) 404 return err; 405 406 return iscsi_conn_start(cls_conn); 407 } 408 409 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 410 { 411 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 412 413 iscsi_session_teardown(cls_session); 414 iscsi_host_remove(shost); 415 iscsi_host_free(shost); 416 } 417 418 static struct iscsi_cls_session * 419 iscsi_iser_session_create(struct iscsi_endpoint *ep, 420 uint16_t cmds_max, uint16_t qdepth, 421 uint32_t initial_cmdsn) 422 { 423 struct iscsi_cls_session *cls_session; 424 struct iscsi_session *session; 425 struct Scsi_Host *shost; 426 struct iser_conn *ib_conn; 427 428 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); 429 if (!shost) 430 return NULL; 431 shost->transportt = iscsi_iser_scsi_transport; 432 shost->max_lun = iscsi_max_lun; 433 shost->max_id = 0; 434 shost->max_channel = 0; 435 shost->max_cmd_len = 16; 436 437 /* 438 * older userspace tools (before 2.0-870) did not pass us 439 * the leading conn's ep so this will be NULL; 440 */ 441 if (ep) 442 ib_conn = ep->dd_data; 443 444 if (iscsi_host_add(shost, 445 ep ? ib_conn->device->ib_device->dma_device : NULL)) 446 goto free_host; 447 448 /* 449 * we do not support setting can_queue cmd_per_lun from userspace yet 450 * because we preallocate so many resources 451 */ 452 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 453 ISCSI_DEF_XMIT_CMDS_MAX, 0, 454 sizeof(struct iscsi_iser_task), 455 initial_cmdsn, 0); 456 if (!cls_session) 457 goto remove_host; 458 session = cls_session->dd_data; 459 460 shost->can_queue = session->scsi_cmds_max; 461 return cls_session; 462 463 remove_host: 464 iscsi_host_remove(shost); 465 free_host: 466 iscsi_host_free(shost); 467 return NULL; 468 } 469 470 static int 471 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 472 enum iscsi_param param, char *buf, int buflen) 473 { 474 int value; 475 476 switch (param) { 477 case ISCSI_PARAM_MAX_RECV_DLENGTH: 478 /* TBD */ 479 break; 480 case ISCSI_PARAM_HDRDGST_EN: 481 sscanf(buf, "%d", &value); 482 if (value) { 483 printk(KERN_ERR "DataDigest wasn't negotiated to None"); 484 return -EPROTO; 485 } 486 break; 487 case ISCSI_PARAM_DATADGST_EN: 488 sscanf(buf, "%d", &value); 489 if (value) { 490 printk(KERN_ERR "DataDigest wasn't negotiated to None"); 491 return -EPROTO; 492 } 493 break; 494 case ISCSI_PARAM_IFMARKER_EN: 495 sscanf(buf, "%d", &value); 496 if (value) { 497 printk(KERN_ERR "IFMarker wasn't negotiated to No"); 498 return -EPROTO; 499 } 500 break; 501 case ISCSI_PARAM_OFMARKER_EN: 502 sscanf(buf, "%d", &value); 503 if (value) { 504 printk(KERN_ERR "OFMarker wasn't negotiated to No"); 505 return -EPROTO; 506 } 507 break; 508 default: 509 return iscsi_set_param(cls_conn, param, buf, buflen); 510 } 511 512 return 0; 513 } 514 515 static void 516 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 517 { 518 struct iscsi_conn *conn = cls_conn->dd_data; 519 520 stats->txdata_octets = conn->txdata_octets; 521 stats->rxdata_octets = conn->rxdata_octets; 522 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 523 stats->dataout_pdus = conn->dataout_pdus_cnt; 524 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 525 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 526 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 527 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 528 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 529 stats->custom_length = 4; 530 strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 531 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 532 strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 533 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 534 strcpy(stats->custom[2].desc, "eh_abort_cnt"); 535 stats->custom[2].value = conn->eh_abort_cnt; 536 strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 537 stats->custom[3].value = conn->fmr_unalign_cnt; 538 } 539 540 static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, 541 enum iscsi_param param, char *buf) 542 { 543 struct iser_conn *ib_conn = ep->dd_data; 544 int len; 545 546 switch (param) { 547 case ISCSI_PARAM_CONN_PORT: 548 case ISCSI_PARAM_CONN_ADDRESS: 549 if (!ib_conn || !ib_conn->cma_id) 550 return -ENOTCONN; 551 552 return iscsi_conn_get_addr_param((struct sockaddr_storage *) 553 &ib_conn->cma_id->route.addr.dst_addr, 554 param, buf); 555 break; 556 default: 557 return -ENOSYS; 558 } 559 560 return len; 561 } 562 563 static struct iscsi_endpoint * 564 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, 565 int non_blocking) 566 { 567 int err; 568 struct iser_conn *ib_conn; 569 struct iscsi_endpoint *ep; 570 571 ep = iscsi_create_endpoint(sizeof(*ib_conn)); 572 if (!ep) 573 return ERR_PTR(-ENOMEM); 574 575 ib_conn = ep->dd_data; 576 ib_conn->ep = ep; 577 iser_conn_init(ib_conn); 578 579 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, 580 non_blocking); 581 if (err) { 582 iscsi_destroy_endpoint(ep); 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_err("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_err("ib conn %p state %d\n",ib_conn, ib_conn->state); 633 iser_conn_terminate(ib_conn); 634 } 635 636 static mode_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 return S_IRUGO; 681 default: 682 return 0; 683 } 684 } 685 686 return 0; 687 } 688 689 static struct scsi_host_template iscsi_iser_sht = { 690 .module = THIS_MODULE, 691 .name = "iSCSI Initiator over iSER, v." DRV_VER, 692 .queuecommand = iscsi_queuecommand, 693 .change_queue_depth = iscsi_change_queue_depth, 694 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 695 .max_sectors = 1024, 696 .cmd_per_lun = ISER_DEF_CMD_PER_LUN, 697 .eh_abort_handler = iscsi_eh_abort, 698 .eh_device_reset_handler= iscsi_eh_device_reset, 699 .eh_target_reset_handler = iscsi_eh_recover_target, 700 .target_alloc = iscsi_target_alloc, 701 .use_clustering = DISABLE_CLUSTERING, 702 .proc_name = "iscsi_iser", 703 .this_id = -1, 704 }; 705 706 static struct iscsi_transport iscsi_iser_transport = { 707 .owner = THIS_MODULE, 708 .name = "iser", 709 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, 710 /* session management */ 711 .create_session = iscsi_iser_session_create, 712 .destroy_session = iscsi_iser_session_destroy, 713 /* connection management */ 714 .create_conn = iscsi_iser_conn_create, 715 .bind_conn = iscsi_iser_conn_bind, 716 .destroy_conn = iscsi_iser_conn_destroy, 717 .attr_is_visible = iser_attr_is_visible, 718 .set_param = iscsi_iser_set_param, 719 .get_conn_param = iscsi_conn_get_param, 720 .get_ep_param = iscsi_iser_get_ep_param, 721 .get_session_param = iscsi_session_get_param, 722 .start_conn = iscsi_iser_conn_start, 723 .stop_conn = iscsi_iser_conn_stop, 724 /* iscsi host params */ 725 .get_host_param = iscsi_host_get_param, 726 .set_host_param = iscsi_host_set_param, 727 /* IO */ 728 .send_pdu = iscsi_conn_send_pdu, 729 .get_stats = iscsi_iser_conn_get_stats, 730 .init_task = iscsi_iser_task_init, 731 .xmit_task = iscsi_iser_task_xmit, 732 .cleanup_task = iscsi_iser_cleanup_task, 733 .alloc_pdu = iscsi_iser_pdu_alloc, 734 /* recovery */ 735 .session_recovery_timedout = iscsi_session_recovery_timedout, 736 737 .ep_connect = iscsi_iser_ep_connect, 738 .ep_poll = iscsi_iser_ep_poll, 739 .ep_disconnect = iscsi_iser_ep_disconnect 740 }; 741 742 static int __init iser_init(void) 743 { 744 int err; 745 746 iser_dbg("Starting iSER datamover...\n"); 747 748 if (iscsi_max_lun < 1) { 749 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); 750 return -EINVAL; 751 } 752 753 memset(&ig, 0, sizeof(struct iser_global)); 754 755 ig.desc_cache = kmem_cache_create("iser_descriptors", 756 sizeof(struct iser_tx_desc), 757 0, SLAB_HWCACHE_ALIGN, 758 NULL); 759 if (ig.desc_cache == NULL) 760 return -ENOMEM; 761 762 /* device init is called only after the first addr resolution */ 763 mutex_init(&ig.device_list_mutex); 764 INIT_LIST_HEAD(&ig.device_list); 765 mutex_init(&ig.connlist_mutex); 766 INIT_LIST_HEAD(&ig.connlist); 767 768 iscsi_iser_scsi_transport = iscsi_register_transport( 769 &iscsi_iser_transport); 770 if (!iscsi_iser_scsi_transport) { 771 iser_err("iscsi_register_transport failed\n"); 772 err = -EINVAL; 773 goto register_transport_failure; 774 } 775 776 return 0; 777 778 register_transport_failure: 779 kmem_cache_destroy(ig.desc_cache); 780 781 return err; 782 } 783 784 static void __exit iser_exit(void) 785 { 786 iser_dbg("Removing iSER datamover...\n"); 787 iscsi_unregister_transport(&iscsi_iser_transport); 788 kmem_cache_destroy(ig.desc_cache); 789 } 790 791 module_init(iser_init); 792 module_exit(iser_exit); 793