iscsi_iser.c revision 8e12452549ba2dfa17db97bc495172fac221a7ab
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 60#include <net/sock.h> 61 62#include <asm/uaccess.h> 63 64#include <scsi/scsi_cmnd.h> 65#include <scsi/scsi_device.h> 66#include <scsi/scsi_eh.h> 67#include <scsi/scsi_tcq.h> 68#include <scsi/scsi_host.h> 69#include <scsi/scsi.h> 70#include <scsi/scsi_transport_iscsi.h> 71 72#include "iscsi_iser.h" 73 74static struct scsi_host_template iscsi_iser_sht; 75static struct iscsi_transport iscsi_iser_transport; 76static struct scsi_transport_template *iscsi_iser_scsi_transport; 77 78static unsigned int iscsi_max_lun = 512; 79module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); 80 81int iser_debug_level = 0; 82 83MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover " 84 "v" DRV_VER " (" DRV_DATE ")"); 85MODULE_LICENSE("Dual BSD/GPL"); 86MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); 87 88module_param_named(debug_level, iser_debug_level, int, 0644); 89MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); 90 91struct iser_global ig; 92 93void 94iscsi_iser_recv(struct iscsi_conn *conn, 95 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) 96{ 97 int rc = 0; 98 int datalen; 99 int ahslen; 100 101 /* verify PDU length */ 102 datalen = ntoh24(hdr->dlength); 103 if (datalen != rx_data_len) { 104 printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n", 105 datalen, rx_data_len); 106 rc = ISCSI_ERR_DATALEN; 107 goto error; 108 } 109 110 /* read AHS */ 111 ahslen = hdr->hlength * 4; 112 113 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 114 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 115 goto error; 116 117 return; 118error: 119 iscsi_conn_failure(conn, rc); 120} 121 122 123/** 124 * iscsi_iser_task_init - Initialize task 125 * @task: iscsi task 126 * 127 * Initialize the task for the scsi command or mgmt command. 128 */ 129static int 130iscsi_iser_task_init(struct iscsi_task *task) 131{ 132 struct iscsi_iser_conn *iser_conn = task->conn->dd_data; 133 struct iscsi_iser_task *iser_task = task->dd_data; 134 135 /* mgmt task */ 136 if (!task->sc) { 137 iser_task->desc.data = task->data; 138 return 0; 139 } 140 141 iser_task->command_sent = 0; 142 iser_task->iser_conn = iser_conn; 143 iser_task_rdma_init(iser_task); 144 return 0; 145} 146 147/** 148 * iscsi_iser_mtask_xmit - xmit management(immediate) task 149 * @conn: iscsi connection 150 * @task: task management task 151 * 152 * Notes: 153 * The function can return -EAGAIN in which case caller must 154 * call it again later, or recover. '0' return code means successful 155 * xmit. 156 * 157 **/ 158static int 159iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 160{ 161 int error = 0; 162 163 debug_scsi("task deq [cid %d itt 0x%x]\n", conn->id, task->itt); 164 165 error = iser_send_control(conn, task); 166 167 /* since iser xmits control with zero copy, tasks can not be recycled 168 * right after sending them. 169 * The recycling scheme is based on whether a response is expected 170 * - if yes, the task is recycled at iscsi_complete_pdu 171 * - if no, the task is recycled at iser_snd_completion 172 */ 173 if (error && error != -ENOBUFS) 174 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 175 176 return error; 177} 178 179static int 180iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 181 struct iscsi_task *task) 182{ 183 struct iscsi_data hdr; 184 int error = 0; 185 186 /* Send data-out PDUs while there's still unsolicited data to send */ 187 while (task->unsol_count > 0) { 188 iscsi_prep_unsolicit_data_pdu(task, &hdr); 189 debug_scsi("Sending data-out: itt 0x%x, data count %d\n", 190 hdr.itt, task->data_count); 191 192 /* the buffer description has been passed with the command */ 193 /* Send the command */ 194 error = iser_send_data_out(conn, task, &hdr); 195 if (error) { 196 task->unsol_datasn--; 197 goto iscsi_iser_task_xmit_unsol_data_exit; 198 } 199 task->unsol_count -= task->data_count; 200 debug_scsi("Need to send %d more as data-out PDUs\n", 201 task->unsol_count); 202 } 203 204iscsi_iser_task_xmit_unsol_data_exit: 205 return error; 206} 207 208static int 209iscsi_iser_task_xmit(struct iscsi_task *task) 210{ 211 struct iscsi_conn *conn = task->conn; 212 struct iscsi_iser_task *iser_task = task->dd_data; 213 int error = 0; 214 215 if (!task->sc) 216 return iscsi_iser_mtask_xmit(conn, task); 217 218 if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 219 BUG_ON(scsi_bufflen(task->sc) == 0); 220 221 debug_scsi("cmd [itt %x total %d imm %d unsol_data %d\n", 222 task->itt, scsi_bufflen(task->sc), 223 task->imm_count, task->unsol_count); 224 } 225 226 debug_scsi("task deq [cid %d itt 0x%x]\n", 227 conn->id, task->itt); 228 229 /* Send the cmd PDU */ 230 if (!iser_task->command_sent) { 231 error = iser_send_command(conn, task); 232 if (error) 233 goto iscsi_iser_task_xmit_exit; 234 iser_task->command_sent = 1; 235 } 236 237 /* Send unsolicited data-out PDU(s) if necessary */ 238 if (task->unsol_count) 239 error = iscsi_iser_task_xmit_unsol_data(conn, task); 240 241 iscsi_iser_task_xmit_exit: 242 if (error && error != -ENOBUFS) 243 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 244 return error; 245} 246 247static void 248iscsi_iser_cleanup_task(struct iscsi_conn *conn, struct iscsi_task *task) 249{ 250 struct iscsi_iser_task *iser_task = task->dd_data; 251 252 /* mgmt tasks do not need special cleanup */ 253 if (!task->sc) 254 return; 255 256 if (iser_task->status == ISER_TASK_STATUS_STARTED) { 257 iser_task->status = ISER_TASK_STATUS_COMPLETED; 258 iser_task_rdma_finalize(iser_task); 259 } 260} 261 262static struct iscsi_cls_conn * 263iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 264{ 265 struct iscsi_conn *conn; 266 struct iscsi_cls_conn *cls_conn; 267 struct iscsi_iser_conn *iser_conn; 268 269 cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); 270 if (!cls_conn) 271 return NULL; 272 conn = cls_conn->dd_data; 273 274 /* 275 * due to issues with the login code re iser sematics 276 * this not set in iscsi_conn_setup - FIXME 277 */ 278 conn->max_recv_dlength = 128; 279 280 iser_conn = conn->dd_data; 281 conn->dd_data = iser_conn; 282 iser_conn->iscsi_conn = conn; 283 284 return cls_conn; 285} 286 287static void 288iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) 289{ 290 struct iscsi_conn *conn = cls_conn->dd_data; 291 struct iscsi_iser_conn *iser_conn = conn->dd_data; 292 struct iser_conn *ib_conn = iser_conn->ib_conn; 293 294 iscsi_conn_teardown(cls_conn); 295 /* 296 * Userspace will normally call the stop callback and 297 * already have freed the ib_conn, but if it goofed up then 298 * we free it here. 299 */ 300 if (ib_conn) { 301 ib_conn->iser_conn = NULL; 302 iser_conn_put(ib_conn); 303 } 304} 305 306static int 307iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 308 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, 309 int is_leading) 310{ 311 struct iscsi_conn *conn = cls_conn->dd_data; 312 struct iscsi_iser_conn *iser_conn; 313 struct iser_conn *ib_conn; 314 struct iscsi_endpoint *ep; 315 int error; 316 317 error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 318 if (error) 319 return error; 320 321 /* the transport ep handle comes from user space so it must be 322 * verified against the global ib connections list */ 323 ep = iscsi_lookup_endpoint(transport_eph); 324 if (!ep) { 325 iser_err("can't bind eph %llx\n", 326 (unsigned long long)transport_eph); 327 return -EINVAL; 328 } 329 ib_conn = ep->dd_data; 330 331 /* binds the iSER connection retrieved from the previously 332 * connected ep_handle to the iSCSI layer connection. exchanges 333 * connection pointers */ 334 iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn); 335 iser_conn = conn->dd_data; 336 ib_conn->iser_conn = iser_conn; 337 iser_conn->ib_conn = ib_conn; 338 iser_conn_get(ib_conn); 339 return 0; 340} 341 342static void 343iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 344{ 345 struct iscsi_conn *conn = cls_conn->dd_data; 346 struct iscsi_iser_conn *iser_conn = conn->dd_data; 347 struct iser_conn *ib_conn = iser_conn->ib_conn; 348 349 /* 350 * Userspace may have goofed up and not bound the connection or 351 * might have only partially setup the connection. 352 */ 353 if (ib_conn) { 354 iscsi_conn_stop(cls_conn, flag); 355 /* 356 * There is no unbind event so the stop callback 357 * must release the ref from the bind. 358 */ 359 iser_conn_put(ib_conn); 360 } 361 iser_conn->ib_conn = NULL; 362} 363 364static int 365iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 366{ 367 struct iscsi_conn *conn = cls_conn->dd_data; 368 int err; 369 370 err = iser_conn_set_full_featured_mode(conn); 371 if (err) 372 return err; 373 374 return iscsi_conn_start(cls_conn); 375} 376 377static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 378{ 379 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 380 381 iscsi_session_teardown(cls_session); 382 iscsi_host_remove(shost); 383 iscsi_host_free(shost); 384} 385 386static struct iscsi_cls_session * 387iscsi_iser_session_create(struct iscsi_endpoint *ep, 388 uint16_t cmds_max, uint16_t qdepth, 389 uint32_t initial_cmdsn, uint32_t *hostno) 390{ 391 struct iscsi_cls_session *cls_session; 392 struct iscsi_session *session; 393 struct Scsi_Host *shost; 394 int i; 395 struct iscsi_task *task; 396 struct iscsi_iser_task *iser_task; 397 struct iser_conn *ib_conn; 398 399 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, ISCSI_MAX_CMD_PER_LUN); 400 if (!shost) 401 return NULL; 402 shost->transportt = iscsi_iser_scsi_transport; 403 shost->max_lun = iscsi_max_lun; 404 shost->max_id = 0; 405 shost->max_channel = 0; 406 shost->max_cmd_len = 16; 407 408 /* 409 * older userspace tools (before 2.0-870) did not pass us 410 * the leading conn's ep so this will be NULL; 411 */ 412 if (ep) 413 ib_conn = ep->dd_data; 414 415 if (iscsi_host_add(shost, 416 ep ? ib_conn->device->ib_device->dma_device : NULL)) 417 goto free_host; 418 *hostno = shost->host_no; 419 420 /* 421 * we do not support setting can_queue cmd_per_lun from userspace yet 422 * because we preallocate so many resources 423 */ 424 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 425 ISCSI_DEF_XMIT_CMDS_MAX, 426 sizeof(struct iscsi_iser_task), 427 initial_cmdsn, 0); 428 if (!cls_session) 429 goto remove_host; 430 session = cls_session->dd_data; 431 432 shost->can_queue = session->scsi_cmds_max; 433 /* libiscsi setup itts, data and pool so just set desc fields */ 434 for (i = 0; i < session->cmds_max; i++) { 435 task = session->cmds[i]; 436 iser_task = task->dd_data; 437 task->hdr = (struct iscsi_cmd *)&iser_task->desc.iscsi_header; 438 task->hdr_max = sizeof(iser_task->desc.iscsi_header); 439 } 440 return cls_session; 441 442remove_host: 443 iscsi_host_remove(shost); 444free_host: 445 iscsi_host_free(shost); 446 return NULL; 447} 448 449static int 450iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 451 enum iscsi_param param, char *buf, int buflen) 452{ 453 int value; 454 455 switch (param) { 456 case ISCSI_PARAM_MAX_RECV_DLENGTH: 457 /* TBD */ 458 break; 459 case ISCSI_PARAM_HDRDGST_EN: 460 sscanf(buf, "%d", &value); 461 if (value) { 462 printk(KERN_ERR "DataDigest wasn't negotiated to None"); 463 return -EPROTO; 464 } 465 break; 466 case ISCSI_PARAM_DATADGST_EN: 467 sscanf(buf, "%d", &value); 468 if (value) { 469 printk(KERN_ERR "DataDigest wasn't negotiated to None"); 470 return -EPROTO; 471 } 472 break; 473 case ISCSI_PARAM_IFMARKER_EN: 474 sscanf(buf, "%d", &value); 475 if (value) { 476 printk(KERN_ERR "IFMarker wasn't negotiated to No"); 477 return -EPROTO; 478 } 479 break; 480 case ISCSI_PARAM_OFMARKER_EN: 481 sscanf(buf, "%d", &value); 482 if (value) { 483 printk(KERN_ERR "OFMarker wasn't negotiated to No"); 484 return -EPROTO; 485 } 486 break; 487 default: 488 return iscsi_set_param(cls_conn, param, buf, buflen); 489 } 490 491 return 0; 492} 493 494static void 495iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 496{ 497 struct iscsi_conn *conn = cls_conn->dd_data; 498 499 stats->txdata_octets = conn->txdata_octets; 500 stats->rxdata_octets = conn->rxdata_octets; 501 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 502 stats->dataout_pdus = conn->dataout_pdus_cnt; 503 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 504 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 505 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 506 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 507 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 508 stats->custom_length = 4; 509 strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 510 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 511 strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 512 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 513 strcpy(stats->custom[2].desc, "eh_abort_cnt"); 514 stats->custom[2].value = conn->eh_abort_cnt; 515 strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 516 stats->custom[3].value = conn->fmr_unalign_cnt; 517} 518 519static struct iscsi_endpoint * 520iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking) 521{ 522 int err; 523 struct iser_conn *ib_conn; 524 struct iscsi_endpoint *ep; 525 526 ep = iscsi_create_endpoint(sizeof(*ib_conn)); 527 if (!ep) 528 return ERR_PTR(-ENOMEM); 529 530 ib_conn = ep->dd_data; 531 ib_conn->ep = ep; 532 iser_conn_init(ib_conn); 533 534 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, 535 non_blocking); 536 if (err) { 537 iscsi_destroy_endpoint(ep); 538 return ERR_PTR(err); 539 } 540 return ep; 541} 542 543static int 544iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 545{ 546 struct iser_conn *ib_conn; 547 int rc; 548 549 ib_conn = ep->dd_data; 550 rc = wait_event_interruptible_timeout(ib_conn->wait, 551 ib_conn->state == ISER_CONN_UP, 552 msecs_to_jiffies(timeout_ms)); 553 554 /* if conn establishment failed, return error code to iscsi */ 555 if (!rc && 556 (ib_conn->state == ISER_CONN_TERMINATING || 557 ib_conn->state == ISER_CONN_DOWN)) 558 rc = -1; 559 560 iser_err("ib conn %p rc = %d\n", ib_conn, rc); 561 562 if (rc > 0) 563 return 1; /* success, this is the equivalent of POLLOUT */ 564 else if (!rc) 565 return 0; /* timeout */ 566 else 567 return rc; /* signal */ 568} 569 570static void 571iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 572{ 573 struct iser_conn *ib_conn; 574 575 ib_conn = ep->dd_data; 576 if (ib_conn->iser_conn) 577 /* 578 * Must suspend xmit path if the ep is bound to the 579 * iscsi_conn, so we know we are not accessing the ib_conn 580 * when we free it. 581 * 582 * This may not be bound if the ep poll failed. 583 */ 584 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); 585 586 587 iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); 588 iser_conn_terminate(ib_conn); 589} 590 591static struct scsi_host_template iscsi_iser_sht = { 592 .module = THIS_MODULE, 593 .name = "iSCSI Initiator over iSER, v." DRV_VER, 594 .queuecommand = iscsi_queuecommand, 595 .change_queue_depth = iscsi_change_queue_depth, 596 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 597 .max_sectors = 1024, 598 .cmd_per_lun = ISCSI_MAX_CMD_PER_LUN, 599 .eh_abort_handler = iscsi_eh_abort, 600 .eh_device_reset_handler= iscsi_eh_device_reset, 601 .eh_target_reset_handler= iscsi_eh_target_reset, 602 .use_clustering = DISABLE_CLUSTERING, 603 .proc_name = "iscsi_iser", 604 .this_id = -1, 605}; 606 607static struct iscsi_transport iscsi_iser_transport = { 608 .owner = THIS_MODULE, 609 .name = "iser", 610 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, 611 .param_mask = ISCSI_MAX_RECV_DLENGTH | 612 ISCSI_MAX_XMIT_DLENGTH | 613 ISCSI_HDRDGST_EN | 614 ISCSI_DATADGST_EN | 615 ISCSI_INITIAL_R2T_EN | 616 ISCSI_MAX_R2T | 617 ISCSI_IMM_DATA_EN | 618 ISCSI_FIRST_BURST | 619 ISCSI_MAX_BURST | 620 ISCSI_PDU_INORDER_EN | 621 ISCSI_DATASEQ_INORDER_EN | 622 ISCSI_EXP_STATSN | 623 ISCSI_PERSISTENT_PORT | 624 ISCSI_PERSISTENT_ADDRESS | 625 ISCSI_TARGET_NAME | ISCSI_TPGT | 626 ISCSI_USERNAME | ISCSI_PASSWORD | 627 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | 628 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | 629 ISCSI_PING_TMO | ISCSI_RECV_TMO | 630 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, 631 .host_param_mask = ISCSI_HOST_HWADDRESS | 632 ISCSI_HOST_NETDEV_NAME | 633 ISCSI_HOST_INITIATOR_NAME, 634 /* session management */ 635 .create_session = iscsi_iser_session_create, 636 .destroy_session = iscsi_iser_session_destroy, 637 /* connection management */ 638 .create_conn = iscsi_iser_conn_create, 639 .bind_conn = iscsi_iser_conn_bind, 640 .destroy_conn = iscsi_iser_conn_destroy, 641 .set_param = iscsi_iser_set_param, 642 .get_conn_param = iscsi_conn_get_param, 643 .get_session_param = iscsi_session_get_param, 644 .start_conn = iscsi_iser_conn_start, 645 .stop_conn = iscsi_iser_conn_stop, 646 /* iscsi host params */ 647 .get_host_param = iscsi_host_get_param, 648 .set_host_param = iscsi_host_set_param, 649 /* IO */ 650 .send_pdu = iscsi_conn_send_pdu, 651 .get_stats = iscsi_iser_conn_get_stats, 652 .init_task = iscsi_iser_task_init, 653 .xmit_task = iscsi_iser_task_xmit, 654 .cleanup_task = iscsi_iser_cleanup_task, 655 /* recovery */ 656 .session_recovery_timedout = iscsi_session_recovery_timedout, 657 658 .ep_connect = iscsi_iser_ep_connect, 659 .ep_poll = iscsi_iser_ep_poll, 660 .ep_disconnect = iscsi_iser_ep_disconnect 661}; 662 663static int __init iser_init(void) 664{ 665 int err; 666 667 iser_dbg("Starting iSER datamover...\n"); 668 669 if (iscsi_max_lun < 1) { 670 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); 671 return -EINVAL; 672 } 673 674 memset(&ig, 0, sizeof(struct iser_global)); 675 676 ig.desc_cache = kmem_cache_create("iser_descriptors", 677 sizeof (struct iser_desc), 678 0, SLAB_HWCACHE_ALIGN, 679 NULL); 680 if (ig.desc_cache == NULL) 681 return -ENOMEM; 682 683 /* device init is called only after the first addr resolution */ 684 mutex_init(&ig.device_list_mutex); 685 INIT_LIST_HEAD(&ig.device_list); 686 mutex_init(&ig.connlist_mutex); 687 INIT_LIST_HEAD(&ig.connlist); 688 689 iscsi_iser_scsi_transport = iscsi_register_transport( 690 &iscsi_iser_transport); 691 if (!iscsi_iser_scsi_transport) { 692 iser_err("iscsi_register_transport failed\n"); 693 err = -EINVAL; 694 goto register_transport_failure; 695 } 696 697 return 0; 698 699register_transport_failure: 700 kmem_cache_destroy(ig.desc_cache); 701 702 return err; 703} 704 705static void __exit iser_exit(void) 706{ 707 iser_dbg("Removing iSER datamover...\n"); 708 iscsi_unregister_transport(&iscsi_iser_transport); 709 kmem_cache_destroy(ig.desc_cache); 710} 711 712module_init(iser_init); 713module_exit(iser_exit); 714