iscsi_iser.c revision 4d1083509a69a36cc1394f188b7b8956e5526a16
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 122static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) 123{ 124 struct iscsi_iser_task *iser_task = task->dd_data; 125 126 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; 127 task->hdr_max = sizeof(iser_task->desc.iscsi_header); 128 return 0; 129} 130 131/** 132 * iscsi_iser_task_init - Initialize task 133 * @task: iscsi task 134 * 135 * Initialize the task for the scsi command or mgmt command. 136 */ 137static int 138iscsi_iser_task_init(struct iscsi_task *task) 139{ 140 struct iscsi_iser_conn *iser_conn = task->conn->dd_data; 141 struct iscsi_iser_task *iser_task = task->dd_data; 142 143 /* mgmt task */ 144 if (!task->sc) { 145 iser_task->desc.data = task->data; 146 return 0; 147 } 148 149 iser_task->command_sent = 0; 150 iser_task->iser_conn = iser_conn; 151 iser_task_rdma_init(iser_task); 152 return 0; 153} 154 155/** 156 * iscsi_iser_mtask_xmit - xmit management(immediate) task 157 * @conn: iscsi connection 158 * @task: task management task 159 * 160 * Notes: 161 * The function can return -EAGAIN in which case caller must 162 * call it again later, or recover. '0' return code means successful 163 * xmit. 164 * 165 **/ 166static int 167iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) 168{ 169 int error = 0; 170 171 iser_dbg("task deq [cid %d itt 0x%x]\n", conn->id, task->itt); 172 173 error = iser_send_control(conn, task); 174 175 /* since iser xmits control with zero copy, tasks can not be recycled 176 * right after sending them. 177 * The recycling scheme is based on whether a response is expected 178 * - if yes, the task is recycled at iscsi_complete_pdu 179 * - if no, the task is recycled at iser_snd_completion 180 */ 181 if (error && error != -ENOBUFS) 182 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 183 184 return error; 185} 186 187static int 188iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, 189 struct iscsi_task *task) 190{ 191 struct iscsi_r2t_info *r2t = &task->unsol_r2t; 192 struct iscsi_data hdr; 193 int error = 0; 194 195 /* Send data-out PDUs while there's still unsolicited data to send */ 196 while (iscsi_task_has_unsol_data(task)) { 197 iscsi_prep_data_out_pdu(task, r2t, &hdr); 198 iser_dbg("Sending data-out: itt 0x%x, data count %d\n", 199 hdr.itt, r2t->data_count); 200 201 /* the buffer description has been passed with the command */ 202 /* Send the command */ 203 error = iser_send_data_out(conn, task, &hdr); 204 if (error) { 205 r2t->datasn--; 206 goto iscsi_iser_task_xmit_unsol_data_exit; 207 } 208 r2t->sent += r2t->data_count; 209 iser_dbg("Need to send %d more as data-out PDUs\n", 210 r2t->data_length - r2t->sent); 211 } 212 213iscsi_iser_task_xmit_unsol_data_exit: 214 return error; 215} 216 217static int 218iscsi_iser_task_xmit(struct iscsi_task *task) 219{ 220 struct iscsi_conn *conn = task->conn; 221 struct iscsi_iser_task *iser_task = task->dd_data; 222 int error = 0; 223 224 if (!task->sc) 225 return iscsi_iser_mtask_xmit(conn, task); 226 227 if (task->sc->sc_data_direction == DMA_TO_DEVICE) { 228 BUG_ON(scsi_bufflen(task->sc) == 0); 229 230 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", 231 task->itt, scsi_bufflen(task->sc), 232 task->imm_count, task->unsol_r2t.data_length); 233 } 234 235 iser_dbg("task deq [cid %d itt 0x%x]\n", 236 conn->id, task->itt); 237 238 /* Send the cmd PDU */ 239 if (!iser_task->command_sent) { 240 error = iser_send_command(conn, task); 241 if (error) 242 goto iscsi_iser_task_xmit_exit; 243 iser_task->command_sent = 1; 244 } 245 246 /* Send unsolicited data-out PDU(s) if necessary */ 247 if (iscsi_task_has_unsol_data(task)) 248 error = iscsi_iser_task_xmit_unsol_data(conn, task); 249 250 iscsi_iser_task_xmit_exit: 251 if (error && error != -ENOBUFS) 252 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 253 return error; 254} 255 256static void iscsi_iser_cleanup_task(struct iscsi_task *task) 257{ 258 struct iscsi_iser_task *iser_task = task->dd_data; 259 260 /* 261 * mgmt tasks do not need special cleanup and we do not 262 * allocate anything in the init task callout 263 */ 264 if (!task->sc || task->state == ISCSI_TASK_PENDING) 265 return; 266 267 if (iser_task->status == ISER_TASK_STATUS_STARTED) { 268 iser_task->status = ISER_TASK_STATUS_COMPLETED; 269 iser_task_rdma_finalize(iser_task); 270 } 271} 272 273static struct iscsi_cls_conn * 274iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 275{ 276 struct iscsi_conn *conn; 277 struct iscsi_cls_conn *cls_conn; 278 struct iscsi_iser_conn *iser_conn; 279 280 cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); 281 if (!cls_conn) 282 return NULL; 283 conn = cls_conn->dd_data; 284 285 /* 286 * due to issues with the login code re iser sematics 287 * this not set in iscsi_conn_setup - FIXME 288 */ 289 conn->max_recv_dlength = 128; 290 291 iser_conn = conn->dd_data; 292 conn->dd_data = iser_conn; 293 iser_conn->iscsi_conn = conn; 294 295 return cls_conn; 296} 297 298static void 299iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) 300{ 301 struct iscsi_conn *conn = cls_conn->dd_data; 302 struct iscsi_iser_conn *iser_conn = conn->dd_data; 303 struct iser_conn *ib_conn = iser_conn->ib_conn; 304 305 iscsi_conn_teardown(cls_conn); 306 /* 307 * Userspace will normally call the stop callback and 308 * already have freed the ib_conn, but if it goofed up then 309 * we free it here. 310 */ 311 if (ib_conn) { 312 ib_conn->iser_conn = NULL; 313 iser_conn_put(ib_conn); 314 } 315} 316 317static int 318iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 319 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, 320 int is_leading) 321{ 322 struct iscsi_conn *conn = cls_conn->dd_data; 323 struct iscsi_iser_conn *iser_conn; 324 struct iser_conn *ib_conn; 325 struct iscsi_endpoint *ep; 326 int error; 327 328 error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 329 if (error) 330 return error; 331 332 /* the transport ep handle comes from user space so it must be 333 * verified against the global ib connections list */ 334 ep = iscsi_lookup_endpoint(transport_eph); 335 if (!ep) { 336 iser_err("can't bind eph %llx\n", 337 (unsigned long long)transport_eph); 338 return -EINVAL; 339 } 340 ib_conn = ep->dd_data; 341 342 /* binds the iSER connection retrieved from the previously 343 * connected ep_handle to the iSCSI layer connection. exchanges 344 * connection pointers */ 345 iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn); 346 iser_conn = conn->dd_data; 347 ib_conn->iser_conn = iser_conn; 348 iser_conn->ib_conn = ib_conn; 349 iser_conn_get(ib_conn); 350 return 0; 351} 352 353static void 354iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 355{ 356 struct iscsi_conn *conn = cls_conn->dd_data; 357 struct iscsi_iser_conn *iser_conn = conn->dd_data; 358 struct iser_conn *ib_conn = iser_conn->ib_conn; 359 360 /* 361 * Userspace may have goofed up and not bound the connection or 362 * might have only partially setup the connection. 363 */ 364 if (ib_conn) { 365 iscsi_conn_stop(cls_conn, flag); 366 /* 367 * There is no unbind event so the stop callback 368 * must release the ref from the bind. 369 */ 370 iser_conn_put(ib_conn); 371 } 372 iser_conn->ib_conn = NULL; 373} 374 375static int 376iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 377{ 378 struct iscsi_conn *conn = cls_conn->dd_data; 379 int err; 380 381 err = iser_conn_set_full_featured_mode(conn); 382 if (err) 383 return err; 384 385 return iscsi_conn_start(cls_conn); 386} 387 388static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 389{ 390 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 391 392 iscsi_session_teardown(cls_session); 393 iscsi_host_remove(shost); 394 iscsi_host_free(shost); 395} 396 397static struct iscsi_cls_session * 398iscsi_iser_session_create(struct iscsi_endpoint *ep, 399 uint16_t cmds_max, uint16_t qdepth, 400 uint32_t initial_cmdsn, uint32_t *hostno) 401{ 402 struct iscsi_cls_session *cls_session; 403 struct iscsi_session *session; 404 struct Scsi_Host *shost; 405 struct iser_conn *ib_conn; 406 407 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 1); 408 if (!shost) 409 return NULL; 410 shost->transportt = iscsi_iser_scsi_transport; 411 shost->max_lun = iscsi_max_lun; 412 shost->max_id = 0; 413 shost->max_channel = 0; 414 shost->max_cmd_len = 16; 415 416 /* 417 * older userspace tools (before 2.0-870) did not pass us 418 * the leading conn's ep so this will be NULL; 419 */ 420 if (ep) 421 ib_conn = ep->dd_data; 422 423 if (iscsi_host_add(shost, 424 ep ? ib_conn->device->ib_device->dma_device : NULL)) 425 goto free_host; 426 *hostno = shost->host_no; 427 428 /* 429 * we do not support setting can_queue cmd_per_lun from userspace yet 430 * because we preallocate so many resources 431 */ 432 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 433 ISCSI_DEF_XMIT_CMDS_MAX, 434 sizeof(struct iscsi_iser_task), 435 initial_cmdsn, 0); 436 if (!cls_session) 437 goto remove_host; 438 session = cls_session->dd_data; 439 440 shost->can_queue = session->scsi_cmds_max; 441 return cls_session; 442 443remove_host: 444 iscsi_host_remove(shost); 445free_host: 446 iscsi_host_free(shost); 447 return NULL; 448} 449 450static int 451iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 452 enum iscsi_param param, char *buf, int buflen) 453{ 454 int value; 455 456 switch (param) { 457 case ISCSI_PARAM_MAX_RECV_DLENGTH: 458 /* TBD */ 459 break; 460 case ISCSI_PARAM_HDRDGST_EN: 461 sscanf(buf, "%d", &value); 462 if (value) { 463 printk(KERN_ERR "DataDigest wasn't negotiated to None"); 464 return -EPROTO; 465 } 466 break; 467 case ISCSI_PARAM_DATADGST_EN: 468 sscanf(buf, "%d", &value); 469 if (value) { 470 printk(KERN_ERR "DataDigest wasn't negotiated to None"); 471 return -EPROTO; 472 } 473 break; 474 case ISCSI_PARAM_IFMARKER_EN: 475 sscanf(buf, "%d", &value); 476 if (value) { 477 printk(KERN_ERR "IFMarker wasn't negotiated to No"); 478 return -EPROTO; 479 } 480 break; 481 case ISCSI_PARAM_OFMARKER_EN: 482 sscanf(buf, "%d", &value); 483 if (value) { 484 printk(KERN_ERR "OFMarker wasn't negotiated to No"); 485 return -EPROTO; 486 } 487 break; 488 default: 489 return iscsi_set_param(cls_conn, param, buf, buflen); 490 } 491 492 return 0; 493} 494 495static void 496iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 497{ 498 struct iscsi_conn *conn = cls_conn->dd_data; 499 500 stats->txdata_octets = conn->txdata_octets; 501 stats->rxdata_octets = conn->rxdata_octets; 502 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 503 stats->dataout_pdus = conn->dataout_pdus_cnt; 504 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 505 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 506 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 507 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 508 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 509 stats->custom_length = 4; 510 strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 511 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 512 strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 513 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 514 strcpy(stats->custom[2].desc, "eh_abort_cnt"); 515 stats->custom[2].value = conn->eh_abort_cnt; 516 strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 517 stats->custom[3].value = conn->fmr_unalign_cnt; 518} 519 520static struct iscsi_endpoint * 521iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking) 522{ 523 int err; 524 struct iser_conn *ib_conn; 525 struct iscsi_endpoint *ep; 526 527 ep = iscsi_create_endpoint(sizeof(*ib_conn)); 528 if (!ep) 529 return ERR_PTR(-ENOMEM); 530 531 ib_conn = ep->dd_data; 532 ib_conn->ep = ep; 533 iser_conn_init(ib_conn); 534 535 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, 536 non_blocking); 537 if (err) { 538 iscsi_destroy_endpoint(ep); 539 return ERR_PTR(err); 540 } 541 return ep; 542} 543 544static int 545iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 546{ 547 struct iser_conn *ib_conn; 548 int rc; 549 550 ib_conn = ep->dd_data; 551 rc = wait_event_interruptible_timeout(ib_conn->wait, 552 ib_conn->state == ISER_CONN_UP, 553 msecs_to_jiffies(timeout_ms)); 554 555 /* if conn establishment failed, return error code to iscsi */ 556 if (!rc && 557 (ib_conn->state == ISER_CONN_TERMINATING || 558 ib_conn->state == ISER_CONN_DOWN)) 559 rc = -1; 560 561 iser_err("ib conn %p rc = %d\n", ib_conn, rc); 562 563 if (rc > 0) 564 return 1; /* success, this is the equivalent of POLLOUT */ 565 else if (!rc) 566 return 0; /* timeout */ 567 else 568 return rc; /* signal */ 569} 570 571static void 572iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) 573{ 574 struct iser_conn *ib_conn; 575 576 ib_conn = ep->dd_data; 577 if (ib_conn->iser_conn) 578 /* 579 * Must suspend xmit path if the ep is bound to the 580 * iscsi_conn, so we know we are not accessing the ib_conn 581 * when we free it. 582 * 583 * This may not be bound if the ep poll failed. 584 */ 585 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); 586 587 588 iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); 589 iser_conn_terminate(ib_conn); 590} 591 592static struct scsi_host_template iscsi_iser_sht = { 593 .module = THIS_MODULE, 594 .name = "iSCSI Initiator over iSER, v." DRV_VER, 595 .queuecommand = iscsi_queuecommand, 596 .change_queue_depth = iscsi_change_queue_depth, 597 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 598 .max_sectors = 1024, 599 .cmd_per_lun = ISER_DEF_CMD_PER_LUN, 600 .eh_abort_handler = iscsi_eh_abort, 601 .eh_device_reset_handler= iscsi_eh_device_reset, 602 .eh_target_reset_handler= iscsi_eh_target_reset, 603 .use_clustering = DISABLE_CLUSTERING, 604 .proc_name = "iscsi_iser", 605 .this_id = -1, 606}; 607 608static struct iscsi_transport iscsi_iser_transport = { 609 .owner = THIS_MODULE, 610 .name = "iser", 611 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, 612 .param_mask = ISCSI_MAX_RECV_DLENGTH | 613 ISCSI_MAX_XMIT_DLENGTH | 614 ISCSI_HDRDGST_EN | 615 ISCSI_DATADGST_EN | 616 ISCSI_INITIAL_R2T_EN | 617 ISCSI_MAX_R2T | 618 ISCSI_IMM_DATA_EN | 619 ISCSI_FIRST_BURST | 620 ISCSI_MAX_BURST | 621 ISCSI_PDU_INORDER_EN | 622 ISCSI_DATASEQ_INORDER_EN | 623 ISCSI_EXP_STATSN | 624 ISCSI_PERSISTENT_PORT | 625 ISCSI_PERSISTENT_ADDRESS | 626 ISCSI_TARGET_NAME | ISCSI_TPGT | 627 ISCSI_USERNAME | ISCSI_PASSWORD | 628 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | 629 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | 630 ISCSI_PING_TMO | ISCSI_RECV_TMO | 631 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, 632 .host_param_mask = ISCSI_HOST_HWADDRESS | 633 ISCSI_HOST_NETDEV_NAME | 634 ISCSI_HOST_INITIATOR_NAME, 635 /* session management */ 636 .create_session = iscsi_iser_session_create, 637 .destroy_session = iscsi_iser_session_destroy, 638 /* connection management */ 639 .create_conn = iscsi_iser_conn_create, 640 .bind_conn = iscsi_iser_conn_bind, 641 .destroy_conn = iscsi_iser_conn_destroy, 642 .set_param = iscsi_iser_set_param, 643 .get_conn_param = iscsi_conn_get_param, 644 .get_session_param = iscsi_session_get_param, 645 .start_conn = iscsi_iser_conn_start, 646 .stop_conn = iscsi_iser_conn_stop, 647 /* iscsi host params */ 648 .get_host_param = iscsi_host_get_param, 649 .set_host_param = iscsi_host_set_param, 650 /* IO */ 651 .send_pdu = iscsi_conn_send_pdu, 652 .get_stats = iscsi_iser_conn_get_stats, 653 .init_task = iscsi_iser_task_init, 654 .xmit_task = iscsi_iser_task_xmit, 655 .cleanup_task = iscsi_iser_cleanup_task, 656 .alloc_pdu = iscsi_iser_pdu_alloc, 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