iscsi_iser.c revision 8e9a20cee4511be4560f9c858d9994eb6913731e
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 * $Id: iscsi_iser.c 6965 2006-05-07 11:36:20Z ogerlitz $ 48 */ 49 50#include <linux/types.h> 51#include <linux/list.h> 52#include <linux/hardirq.h> 53#include <linux/kfifo.h> 54#include <linux/blkdev.h> 55#include <linux/init.h> 56#include <linux/ioctl.h> 57#include <linux/cdev.h> 58#include <linux/in.h> 59#include <linux/net.h> 60#include <linux/scatterlist.h> 61#include <linux/delay.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 77static struct scsi_host_template iscsi_iser_sht; 78static struct iscsi_transport iscsi_iser_transport; 79static struct scsi_transport_template *iscsi_iser_scsi_transport; 80 81static unsigned int iscsi_max_lun = 512; 82module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); 83 84int iser_debug_level = 0; 85 86MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover " 87 "v" DRV_VER " (" DRV_DATE ")"); 88MODULE_LICENSE("Dual BSD/GPL"); 89MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); 90 91module_param_named(debug_level, iser_debug_level, int, 0644); 92MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); 93 94struct iser_global ig; 95 96void 97iscsi_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) { 107 printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n", 108 datalen, rx_data_len); 109 rc = ISCSI_ERR_DATALEN; 110 goto error; 111 } 112 113 /* read AHS */ 114 ahslen = hdr->hlength * 4; 115 116 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); 117 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) 118 goto error; 119 120 return; 121error: 122 iscsi_conn_failure(conn, rc); 123} 124 125 126/** 127 * iscsi_iser_task_init - Initialize task 128 * @task: iscsi task 129 * 130 * Initialize the task for the scsi command or mgmt command. 131 */ 132static int 133iscsi_iser_task_init(struct iscsi_task *task) 134{ 135 struct iscsi_iser_conn *iser_conn = task->conn->dd_data; 136 struct iscsi_iser_task *iser_task = task->dd_data; 137 138 /* mgmt task */ 139 if (!task->sc) { 140 iser_task->desc.data = task->data; 141 return 0; 142 } 143 144 iser_task->command_sent = 0; 145 iser_task->iser_conn = iser_conn; 146 iser_task_rdma_init(iser_task); 147 return 0; 148} 149 150/** 151 * iscsi_iser_mtask_xmit - xmit management(immediate) task 152 * @conn: iscsi connection 153 * @task: task management task 154 * 155 * Notes: 156 * The function can return -EAGAIN in which case caller must 157 * call it again later, or recover. '0' return code means successful 158 * xmit. 159 * 160 **/ 161static int 162iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 163{ 164 int error = 0; 165 166 debug_scsi("task deq [cid %d itt 0x%x]\n", conn->id, task->itt); 167 168 error = iser_send_control(conn, task); 169 170 /* since iser xmits control with zero copy, tasks can not be recycled 171 * right after sending them. 172 * The recycling scheme is based on whether a response is expected 173 * - if yes, the task is recycled at iscsi_complete_pdu 174 * - if no, the task is recycled at iser_snd_completion 175 */ 176 if (error && error != -ENOBUFS) 177 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 178 179 return error; 180} 181 182static int 183iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 184 struct iscsi_task *task) 185{ 186 struct iscsi_data hdr; 187 int error = 0; 188 189 /* Send data-out PDUs while there's still unsolicited data to send */ 190 while (task->unsol_count > 0) { 191 iscsi_prep_unsolicit_data_pdu(task, &hdr); 192 debug_scsi("Sending data-out: itt 0x%x, data count %d\n", 193 hdr.itt, task->data_count); 194 195 /* the buffer description has been passed with the command */ 196 /* Send the command */ 197 error = iser_send_data_out(conn, task, &hdr); 198 if (error) { 199 task->unsol_datasn--; 200 goto iscsi_iser_task_xmit_unsol_data_exit; 201 } 202 task->unsol_count -= task->data_count; 203 debug_scsi("Need to send %d more as data-out PDUs\n", 204 task->unsol_count); 205 } 206 207iscsi_iser_task_xmit_unsol_data_exit: 208 return error; 209} 210 211static int 212iscsi_iser_task_xmit(struct iscsi_task *task) 213{ 214 struct iscsi_conn *conn = task->conn; 215 struct iscsi_iser_task *iser_task = task->dd_data; 216 int error = 0; 217 218 if (!task->sc) 219 return iscsi_iser_mtask_xmit(conn, task); 220 221 if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 222 BUG_ON(scsi_bufflen(task->sc) == 0); 223 224 debug_scsi("cmd [itt %x total %d imm %d unsol_data %d\n", 225 task->itt, scsi_bufflen(task->sc), 226 task->imm_count, task->unsol_count); 227 } 228 229 debug_scsi("task deq [cid %d itt 0x%x]\n", 230 conn->id, task->itt); 231 232 /* Send the cmd PDU */ 233 if (!iser_task->command_sent) { 234 error = iser_send_command(conn, task); 235 if (error) 236 goto iscsi_iser_task_xmit_exit; 237 iser_task->command_sent = 1; 238 } 239 240 /* Send unsolicited data-out PDU(s) if necessary */ 241 if (task->unsol_count) 242 error = iscsi_iser_task_xmit_unsol_data(conn, task); 243 244 iscsi_iser_task_xmit_exit: 245 if (error && error != -ENOBUFS) 246 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 247 return error; 248} 249 250static void 251iscsi_iser_cleanup_task(struct iscsi_conn *conn, struct iscsi_task *task) 252{ 253 struct iscsi_iser_task *iser_task = task->dd_data; 254 255 /* mgmt tasks do not need special cleanup */ 256 if (!task->sc) 257 return; 258 259 if (iser_task->status == ISER_TASK_STATUS_STARTED) { 260 iser_task->status = ISER_TASK_STATUS_COMPLETED; 261 iser_task_rdma_finalize(iser_task); 262 } 263} 264 265static struct iscsi_cls_conn * 266iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 267{ 268 struct iscsi_conn *conn; 269 struct iscsi_cls_conn *cls_conn; 270 struct iscsi_iser_conn *iser_conn; 271 272 cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); 273 if (!cls_conn) 274 return NULL; 275 conn = cls_conn->dd_data; 276 277 /* 278 * due to issues with the login code re iser sematics 279 * this not set in iscsi_conn_setup - FIXME 280 */ 281 conn->max_recv_dlength = 128; 282 283 iser_conn = conn->dd_data; 284 conn->dd_data = iser_conn; 285 iser_conn->iscsi_conn = conn; 286 287 return cls_conn; 288} 289 290static void 291iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) 292{ 293 struct iscsi_conn *conn = cls_conn->dd_data; 294 struct iscsi_iser_conn *iser_conn = conn->dd_data; 295 struct iser_conn *ib_conn = iser_conn->ib_conn; 296 297 iscsi_conn_teardown(cls_conn); 298 /* 299 * Userspace will normally call the stop callback and 300 * already have freed the ib_conn, but if it goofed up then 301 * we free it here. 302 */ 303 if (ib_conn) { 304 ib_conn->iser_conn = NULL; 305 iser_conn_put(ib_conn); 306 } 307} 308 309static int 310iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 311 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, 312 int is_leading) 313{ 314 struct iscsi_conn *conn = cls_conn->dd_data; 315 struct iscsi_iser_conn *iser_conn; 316 struct iser_conn *ib_conn; 317 struct iscsi_endpoint *ep; 318 int error; 319 320 error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 321 if (error) 322 return error; 323 324 /* the transport ep handle comes from user space so it must be 325 * verified against the global ib connections list */ 326 ep = iscsi_lookup_endpoint(transport_eph); 327 if (!ep) { 328 iser_err("can't bind eph %llx\n", 329 (unsigned long long)transport_eph); 330 return -EINVAL; 331 } 332 ib_conn = ep->dd_data; 333 334 /* binds the iSER connection retrieved from the previously 335 * connected ep_handle to the iSCSI layer connection. exchanges 336 * connection pointers */ 337 iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn); 338 iser_conn = conn->dd_data; 339 ib_conn->iser_conn = iser_conn; 340 iser_conn->ib_conn = ib_conn; 341 iser_conn_get(ib_conn); 342 return 0; 343} 344 345static void 346iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 347{ 348 struct iscsi_conn *conn = cls_conn->dd_data; 349 struct iscsi_iser_conn *iser_conn = conn->dd_data; 350 struct iser_conn *ib_conn = iser_conn->ib_conn; 351 352 /* 353 * Userspace may have goofed up and not bound the connection or 354 * might have only partially setup the connection. 355 */ 356 if (ib_conn) { 357 iscsi_conn_stop(cls_conn, flag); 358 /* 359 * There is no unbind event so the stop callback 360 * must release the ref from the bind. 361 */ 362 iser_conn_put(ib_conn); 363 } 364 iser_conn->ib_conn = NULL; 365} 366 367static int 368iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 369{ 370 struct iscsi_conn *conn = cls_conn->dd_data; 371 int err; 372 373 err = iser_conn_set_full_featured_mode(conn); 374 if (err) 375 return err; 376 377 return iscsi_conn_start(cls_conn); 378} 379 380static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 381{ 382 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 383 384 iscsi_host_remove(shost); 385 iscsi_host_free(shost); 386} 387 388static struct iscsi_cls_session * 389iscsi_iser_session_create(struct iscsi_endpoint *ep, 390 uint16_t cmds_max, uint16_t qdepth, 391 uint32_t initial_cmdsn, uint32_t *hostno) 392{ 393 struct iscsi_cls_session *cls_session; 394 struct iscsi_session *session; 395 struct Scsi_Host *shost; 396 int i; 397 struct iscsi_task *task; 398 struct iscsi_iser_task *iser_task; 399 struct iser_conn *ib_conn; 400 401 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, ISCSI_MAX_CMD_PER_LUN); 402 if (!shost) 403 return NULL; 404 shost->transportt = iscsi_iser_scsi_transport; 405 shost->max_lun = iscsi_max_lun; 406 shost->max_id = 0; 407 shost->max_channel = 0; 408 shost->max_cmd_len = 16; 409 410 /* 411 * older userspace tools (before 2.0-870) did not pass us 412 * the leading conn's ep so this will be NULL; 413 */ 414 if (ep) 415 ib_conn = ep->dd_data; 416 417 if (iscsi_host_add(shost, 418 ep ? ib_conn->device->ib_device->dma_device : NULL)) 419 goto free_host; 420 *hostno = shost->host_no; 421 422 /* 423 * we do not support setting can_queue cmd_per_lun from userspace yet 424 * because we preallocate so many resources 425 */ 426 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 427 ISCSI_DEF_XMIT_CMDS_MAX, 428 sizeof(struct iscsi_iser_task), 429 initial_cmdsn, 0); 430 if (!cls_session) 431 goto remove_host; 432 session = cls_session->dd_data; 433 434 shost->can_queue = session->scsi_cmds_max; 435 /* libiscsi setup itts, data and pool so just set desc fields */ 436 for (i = 0; i < session->cmds_max; i++) { 437 task = session->cmds[i]; 438 iser_task = task->dd_data; 439 task->hdr = (struct iscsi_cmd *)&iser_task->desc.iscsi_header; 440 task->hdr_max = sizeof(iser_task->desc.iscsi_header); 441 } 442 return cls_session; 443 444remove_host: 445 iscsi_host_remove(shost); 446free_host: 447 iscsi_host_free(shost); 448 return NULL; 449} 450 451static int 452iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 453 enum iscsi_param param, char *buf, int buflen) 454{ 455 int value; 456 457 switch (param) { 458 case ISCSI_PARAM_MAX_RECV_DLENGTH: 459 /* TBD */ 460 break; 461 case ISCSI_PARAM_HDRDGST_EN: 462 sscanf(buf, "%d", &value); 463 if (value) { 464 printk(KERN_ERR "DataDigest wasn't negotiated to None"); 465 return -EPROTO; 466 } 467 break; 468 case ISCSI_PARAM_DATADGST_EN: 469 sscanf(buf, "%d", &value); 470 if (value) { 471 printk(KERN_ERR "DataDigest wasn't negotiated to None"); 472 return -EPROTO; 473 } 474 break; 475 case ISCSI_PARAM_IFMARKER_EN: 476 sscanf(buf, "%d", &value); 477 if (value) { 478 printk(KERN_ERR "IFMarker wasn't negotiated to No"); 479 return -EPROTO; 480 } 481 break; 482 case ISCSI_PARAM_OFMARKER_EN: 483 sscanf(buf, "%d", &value); 484 if (value) { 485 printk(KERN_ERR "OFMarker wasn't negotiated to No"); 486 return -EPROTO; 487 } 488 break; 489 default: 490 return iscsi_set_param(cls_conn, param, buf, buflen); 491 } 492 493 return 0; 494} 495 496static void 497iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 498{ 499 struct iscsi_conn *conn = cls_conn->dd_data; 500 501 stats->txdata_octets = conn->txdata_octets; 502 stats->rxdata_octets = conn->rxdata_octets; 503 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 504 stats->dataout_pdus = conn->dataout_pdus_cnt; 505 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 506 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 507 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 508 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 509 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 510 stats->custom_length = 4; 511 strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 512 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 513 strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 514 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 515 strcpy(stats->custom[2].desc, "eh_abort_cnt"); 516 stats->custom[2].value = conn->eh_abort_cnt; 517 strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 518 stats->custom[3].value = conn->fmr_unalign_cnt; 519} 520 521static struct iscsi_endpoint * 522iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking) 523{ 524 int err; 525 struct iser_conn *ib_conn; 526 struct iscsi_endpoint *ep; 527 528 ep = iscsi_create_endpoint(sizeof(*ib_conn)); 529 if (!ep) 530 return ERR_PTR(-ENOMEM); 531 532 ib_conn = ep->dd_data; 533 ib_conn->ep = ep; 534 iser_conn_init(ib_conn); 535 536 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, 537 non_blocking); 538 if (err) { 539 iscsi_destroy_endpoint(ep); 540 return ERR_PTR(err); 541 } 542 return ep; 543} 544 545static int 546iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 547{ 548 struct iser_conn *ib_conn; 549 int rc; 550 551 ib_conn = ep->dd_data; 552 rc = wait_event_interruptible_timeout(ib_conn->wait, 553 ib_conn->state == ISER_CONN_UP, 554 msecs_to_jiffies(timeout_ms)); 555 556 /* if conn establishment failed, return error code to iscsi */ 557 if (!rc && 558 (ib_conn->state == ISER_CONN_TERMINATING || 559 ib_conn->state == ISER_CONN_DOWN)) 560 rc = -1; 561 562 iser_err("ib conn %p rc = %d\n", ib_conn, rc); 563 564 if (rc > 0) 565 return 1; /* success, this is the equivalent of POLLOUT */ 566 else if (!rc) 567 return 0; /* timeout */ 568 else 569 return rc; /* signal */ 570} 571 572static void 573iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 574{ 575 struct iser_conn *ib_conn; 576 577 ib_conn = ep->dd_data; 578 if (ib_conn->iser_conn) 579 /* 580 * Must suspend xmit path if the ep is bound to the 581 * iscsi_conn, so we know we are not accessing the ib_conn 582 * when we free it. 583 * 584 * This may not be bound if the ep poll failed. 585 */ 586 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); 587 588 589 iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); 590 iser_conn_terminate(ib_conn); 591} 592 593static struct scsi_host_template iscsi_iser_sht = { 594 .module = THIS_MODULE, 595 .name = "iSCSI Initiator over iSER, v." DRV_VER, 596 .queuecommand = iscsi_queuecommand, 597 .change_queue_depth = iscsi_change_queue_depth, 598 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 599 .max_sectors = 1024, 600 .cmd_per_lun = ISCSI_MAX_CMD_PER_LUN, 601 .eh_abort_handler = iscsi_eh_abort, 602 .eh_device_reset_handler= iscsi_eh_device_reset, 603 .eh_host_reset_handler = iscsi_eh_host_reset, 604 .use_clustering = DISABLE_CLUSTERING, 605 .proc_name = "iscsi_iser", 606 .this_id = -1, 607}; 608 609static struct iscsi_transport iscsi_iser_transport = { 610 .owner = THIS_MODULE, 611 .name = "iser", 612 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, 613 .param_mask = ISCSI_MAX_RECV_DLENGTH | 614 ISCSI_MAX_XMIT_DLENGTH | 615 ISCSI_HDRDGST_EN | 616 ISCSI_DATADGST_EN | 617 ISCSI_INITIAL_R2T_EN | 618 ISCSI_MAX_R2T | 619 ISCSI_IMM_DATA_EN | 620 ISCSI_FIRST_BURST | 621 ISCSI_MAX_BURST | 622 ISCSI_PDU_INORDER_EN | 623 ISCSI_DATASEQ_INORDER_EN | 624 ISCSI_EXP_STATSN | 625 ISCSI_PERSISTENT_PORT | 626 ISCSI_PERSISTENT_ADDRESS | 627 ISCSI_TARGET_NAME | ISCSI_TPGT | 628 ISCSI_USERNAME | ISCSI_PASSWORD | 629 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | 630 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | 631 ISCSI_PING_TMO | ISCSI_RECV_TMO | 632 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, 633 .host_param_mask = ISCSI_HOST_HWADDRESS | 634 ISCSI_HOST_NETDEV_NAME | 635 ISCSI_HOST_INITIATOR_NAME, 636 /* session management */ 637 .create_session = iscsi_iser_session_create, 638 .destroy_session = iscsi_iser_session_destroy, 639 /* connection management */ 640 .create_conn = iscsi_iser_conn_create, 641 .bind_conn = iscsi_iser_conn_bind, 642 .destroy_conn = iscsi_iser_conn_destroy, 643 .set_param = iscsi_iser_set_param, 644 .get_conn_param = iscsi_conn_get_param, 645 .get_session_param = iscsi_session_get_param, 646 .start_conn = iscsi_iser_conn_start, 647 .stop_conn = iscsi_iser_conn_stop, 648 /* iscsi host params */ 649 .get_host_param = iscsi_host_get_param, 650 .set_host_param = iscsi_host_set_param, 651 /* IO */ 652 .send_pdu = iscsi_conn_send_pdu, 653 .get_stats = iscsi_iser_conn_get_stats, 654 .init_task = iscsi_iser_task_init, 655 .xmit_task = iscsi_iser_task_xmit, 656 .cleanup_task = iscsi_iser_cleanup_task, 657 /* recovery */ 658 .session_recovery_timedout = iscsi_session_recovery_timedout, 659 660 .ep_connect = iscsi_iser_ep_connect, 661 .ep_poll = iscsi_iser_ep_poll, 662 .ep_disconnect = iscsi_iser_ep_disconnect 663}; 664 665static int __init iser_init(void) 666{ 667 int err; 668 669 iser_dbg("Starting iSER datamover...\n"); 670 671 if (iscsi_max_lun < 1) { 672 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); 673 return -EINVAL; 674 } 675 676 memset(&ig, 0, sizeof(struct iser_global)); 677 678 ig.desc_cache = kmem_cache_create("iser_descriptors", 679 sizeof (struct iser_desc), 680 0, SLAB_HWCACHE_ALIGN, 681 NULL); 682 if (ig.desc_cache == NULL) 683 return -ENOMEM; 684 685 /* device init is called only after the first addr resolution */ 686 mutex_init(&ig.device_list_mutex); 687 INIT_LIST_HEAD(&ig.device_list); 688 mutex_init(&ig.connlist_mutex); 689 INIT_LIST_HEAD(&ig.connlist); 690 691 iscsi_iser_scsi_transport = iscsi_register_transport( 692 &iscsi_iser_transport); 693 if (!iscsi_iser_scsi_transport) { 694 iser_err("iscsi_register_transport failed\n"); 695 err = -EINVAL; 696 goto register_transport_failure; 697 } 698 699 return 0; 700 701register_transport_failure: 702 kmem_cache_destroy(ig.desc_cache); 703 704 return err; 705} 706 707static void __exit iser_exit(void) 708{ 709 iser_dbg("Removing iSER datamover...\n"); 710 iscsi_unregister_transport(&iscsi_iser_transport); 711 kmem_cache_destroy(ig.desc_cache); 712} 713 714module_init(iser_init); 715module_exit(iser_exit); 716