iscsi_iser.c revision 2747fdb25726caa1a89229f43d99ca50af72576a
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 ctask 128 * @ctask: iscsi ctask 129 * 130 * Initialize the ctask for the scsi command or mgmt command. 131 */ 132static int 133iscsi_iser_task_init(struct iscsi_cmd_task *ctask) 134{ 135 struct iscsi_iser_conn *iser_conn = ctask->conn->dd_data; 136 struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; 137 138 /* mgmt ctask */ 139 if (!ctask->sc) { 140 iser_ctask->desc.data = ctask->data; 141 return 0; 142 } 143 144 iser_ctask->command_sent = 0; 145 iser_ctask->iser_conn = iser_conn; 146 iser_ctask_rdma_init(iser_ctask); 147 return 0; 148} 149 150/** 151 * iscsi_iser_mtask_xmit - xmit management(immediate) ctask 152 * @conn: iscsi connection 153 * @ctask: ctask management ctask 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_cmd_task *ctask) 163{ 164 int error = 0; 165 166 debug_scsi("ctask deq [cid %d itt 0x%x]\n", conn->id, ctask->itt); 167 168 error = iser_send_control(conn, ctask); 169 170 /* since iser xmits control with zero copy, ctasks 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 ctask is recycled at iscsi_complete_pdu 174 * - if no, the ctask 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_cmd_task *ctask) 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 (ctask->unsol_count > 0) { 191 iscsi_prep_unsolicit_data_pdu(ctask, &hdr); 192 debug_scsi("Sending data-out: itt 0x%x, data count %d\n", 193 hdr.itt, ctask->data_count); 194 195 /* the buffer description has been passed with the command */ 196 /* Send the command */ 197 error = iser_send_data_out(conn, ctask, &hdr); 198 if (error) { 199 ctask->unsol_datasn--; 200 goto iscsi_iser_task_xmit_unsol_data_exit; 201 } 202 ctask->unsol_count -= ctask->data_count; 203 debug_scsi("Need to send %d more as data-out PDUs\n", 204 ctask->unsol_count); 205 } 206 207iscsi_iser_task_xmit_unsol_data_exit: 208 return error; 209} 210 211static int 212iscsi_iser_task_xmit(struct iscsi_cmd_task *ctask) 213{ 214 struct iscsi_conn *conn = ctask->conn; 215 struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; 216 int error = 0; 217 218 if (!ctask->sc) 219 return iscsi_iser_mtask_xmit(conn, ctask); 220 221 if (ctask->sc->sc_data_direction == DMA_TO_DEVICE) { 222 BUG_ON(scsi_bufflen(ctask->sc) == 0); 223 224 debug_scsi("cmd [itt %x total %d imm %d unsol_data %d\n", 225 ctask->itt, scsi_bufflen(ctask->sc), 226 ctask->imm_count, ctask->unsol_count); 227 } 228 229 debug_scsi("ctask deq [cid %d itt 0x%x]\n", 230 conn->id, ctask->itt); 231 232 /* Send the cmd PDU */ 233 if (!iser_ctask->command_sent) { 234 error = iser_send_command(conn, ctask); 235 if (error) 236 goto iscsi_iser_task_xmit_exit; 237 iser_ctask->command_sent = 1; 238 } 239 240 /* Send unsolicited data-out PDU(s) if necessary */ 241 if (ctask->unsol_count) 242 error = iscsi_iser_task_xmit_unsol_data(conn, ctask); 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_cmd_task *ctask) 252{ 253 struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; 254 255 /* mgmt tasks do not need special cleanup */ 256 if (!ctask->sc) 257 return; 258 259 if (iser_ctask->status == ISER_TASK_STATUS_STARTED) { 260 iser_ctask->status = ISER_TASK_STATUS_COMPLETED; 261 iser_ctask_rdma_finalize(iser_ctask); 262 } 263} 264 265static struct iser_conn * 266iscsi_iser_ib_conn_lookup(__u64 ep_handle) 267{ 268 struct iser_conn *ib_conn; 269 struct iser_conn *uib_conn = (struct iser_conn *)(unsigned long)ep_handle; 270 271 mutex_lock(&ig.connlist_mutex); 272 list_for_each_entry(ib_conn, &ig.connlist, conn_list) { 273 if (ib_conn == uib_conn) { 274 mutex_unlock(&ig.connlist_mutex); 275 return ib_conn; 276 } 277 } 278 mutex_unlock(&ig.connlist_mutex); 279 iser_err("no conn exists for eph %llx\n",(unsigned long long)ep_handle); 280 return NULL; 281} 282 283static struct iscsi_cls_conn * 284iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 285{ 286 struct iscsi_conn *conn; 287 struct iscsi_cls_conn *cls_conn; 288 struct iscsi_iser_conn *iser_conn; 289 290 cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); 291 if (!cls_conn) 292 return NULL; 293 conn = cls_conn->dd_data; 294 295 /* 296 * due to issues with the login code re iser sematics 297 * this not set in iscsi_conn_setup - FIXME 298 */ 299 conn->max_recv_dlength = 128; 300 301 iser_conn = conn->dd_data; 302 /* currently this is the only field which need to be initiated */ 303 rwlock_init(&iser_conn->lock); 304 305 conn->dd_data = iser_conn; 306 iser_conn->iscsi_conn = conn; 307 308 return cls_conn; 309} 310 311static void 312iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) 313{ 314 struct iscsi_conn *conn = cls_conn->dd_data; 315 struct iscsi_iser_conn *iser_conn = conn->dd_data; 316 struct iser_conn *ib_conn = iser_conn->ib_conn; 317 318 iscsi_conn_teardown(cls_conn); 319 /* 320 * Userspace will normally call the stop callback and 321 * already have freed the ib_conn, but if it goofed up then 322 * we free it here. 323 */ 324 if (ib_conn) { 325 ib_conn->iser_conn = NULL; 326 iser_conn_put(ib_conn); 327 } 328} 329 330static int 331iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, 332 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, 333 int is_leading) 334{ 335 struct iscsi_conn *conn = cls_conn->dd_data; 336 struct iscsi_iser_conn *iser_conn; 337 struct iser_conn *ib_conn; 338 int error; 339 340 error = iscsi_conn_bind(cls_session, cls_conn, is_leading); 341 if (error) 342 return error; 343 344 /* the transport ep handle comes from user space so it must be 345 * verified against the global ib connections list */ 346 ib_conn = iscsi_iser_ib_conn_lookup(transport_eph); 347 if (!ib_conn) { 348 iser_err("can't bind eph %llx\n", 349 (unsigned long long)transport_eph); 350 return -EINVAL; 351 } 352 /* binds the iSER connection retrieved from the previously 353 * connected ep_handle to the iSCSI layer connection. exchanges 354 * connection pointers */ 355 iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn); 356 iser_conn = conn->dd_data; 357 ib_conn->iser_conn = iser_conn; 358 iser_conn->ib_conn = ib_conn; 359 iser_conn_get(ib_conn); 360 361 conn->recv_lock = &iser_conn->lock; 362 363 return 0; 364} 365 366static void 367iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 368{ 369 struct iscsi_conn *conn = cls_conn->dd_data; 370 struct iscsi_iser_conn *iser_conn = conn->dd_data; 371 struct iser_conn *ib_conn = iser_conn->ib_conn; 372 373 iscsi_conn_stop(cls_conn, flag); 374 /* 375 * There is no unbind event so the stop callback 376 * must release the ref from the bind. 377 */ 378 iser_conn_put(ib_conn); 379 iser_conn->ib_conn = NULL; 380} 381 382static int 383iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) 384{ 385 struct iscsi_conn *conn = cls_conn->dd_data; 386 int err; 387 388 err = iser_conn_set_full_featured_mode(conn); 389 if (err) 390 return err; 391 392 return iscsi_conn_start(cls_conn); 393} 394 395static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) 396{ 397 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 398 399 iscsi_host_remove(shost); 400 iscsi_host_free(shost); 401} 402 403static struct iscsi_cls_session * 404iscsi_iser_session_create(struct Scsi_Host *shost, 405 uint16_t cmds_max, uint16_t qdepth, 406 uint32_t initial_cmdsn, uint32_t *hostno) 407{ 408 struct iscsi_cls_session *cls_session; 409 struct iscsi_session *session; 410 int i; 411 struct iscsi_cmd_task *ctask; 412 struct iscsi_iser_cmd_task *iser_ctask; 413 414 if (shost) { 415 printk(KERN_ERR "iscsi_tcp: invalid shost %d.\n", 416 shost->host_no); 417 return NULL; 418 } 419 420 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, ISCSI_MAX_CMD_PER_LUN); 421 if (!shost) 422 return NULL; 423 shost->transportt = iscsi_iser_scsi_transport; 424 shost->max_lun = iscsi_max_lun; 425 shost->max_id = 0; 426 shost->max_channel = 0; 427 shost->max_cmd_len = 16; 428 429 if (iscsi_host_add(shost, NULL)) 430 goto free_host; 431 *hostno = shost->host_no; 432 433 /* 434 * we do not support setting can_queue cmd_per_lun from userspace yet 435 * because we preallocate so many resources 436 */ 437 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, 438 ISCSI_DEF_XMIT_CMDS_MAX, 439 sizeof(struct iscsi_iser_cmd_task), 440 initial_cmdsn); 441 if (!cls_session) 442 goto remove_host; 443 session = cls_session->dd_data; 444 445 shost->can_queue = session->scsi_cmds_max; 446 /* libiscsi setup itts, data and pool so just set desc fields */ 447 for (i = 0; i < session->cmds_max; i++) { 448 ctask = session->cmds[i]; 449 iser_ctask = ctask->dd_data; 450 ctask->hdr = (struct iscsi_cmd *)&iser_ctask->desc.iscsi_header; 451 ctask->hdr_max = sizeof(iser_ctask->desc.iscsi_header); 452 } 453 return cls_session; 454 455remove_host: 456 iscsi_host_remove(shost); 457free_host: 458 iscsi_host_free(shost); 459 return NULL; 460} 461 462static int 463iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, 464 enum iscsi_param param, char *buf, int buflen) 465{ 466 int value; 467 468 switch (param) { 469 case ISCSI_PARAM_MAX_RECV_DLENGTH: 470 /* TBD */ 471 break; 472 case ISCSI_PARAM_HDRDGST_EN: 473 sscanf(buf, "%d", &value); 474 if (value) { 475 printk(KERN_ERR "DataDigest wasn't negotiated to None"); 476 return -EPROTO; 477 } 478 break; 479 case ISCSI_PARAM_DATADGST_EN: 480 sscanf(buf, "%d", &value); 481 if (value) { 482 printk(KERN_ERR "DataDigest wasn't negotiated to None"); 483 return -EPROTO; 484 } 485 break; 486 case ISCSI_PARAM_IFMARKER_EN: 487 sscanf(buf, "%d", &value); 488 if (value) { 489 printk(KERN_ERR "IFMarker wasn't negotiated to No"); 490 return -EPROTO; 491 } 492 break; 493 case ISCSI_PARAM_OFMARKER_EN: 494 sscanf(buf, "%d", &value); 495 if (value) { 496 printk(KERN_ERR "OFMarker wasn't negotiated to No"); 497 return -EPROTO; 498 } 499 break; 500 default: 501 return iscsi_set_param(cls_conn, param, buf, buflen); 502 } 503 504 return 0; 505} 506 507static void 508iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) 509{ 510 struct iscsi_conn *conn = cls_conn->dd_data; 511 512 stats->txdata_octets = conn->txdata_octets; 513 stats->rxdata_octets = conn->rxdata_octets; 514 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 515 stats->dataout_pdus = conn->dataout_pdus_cnt; 516 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 517 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ 518 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ 519 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 520 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 521 stats->custom_length = 4; 522 strcpy(stats->custom[0].desc, "qp_tx_queue_full"); 523 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ 524 strcpy(stats->custom[1].desc, "fmr_map_not_avail"); 525 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; 526 strcpy(stats->custom[2].desc, "eh_abort_cnt"); 527 stats->custom[2].value = conn->eh_abort_cnt; 528 strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); 529 stats->custom[3].value = conn->fmr_unalign_cnt; 530} 531 532static int 533iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking, 534 __u64 *ep_handle) 535{ 536 int err; 537 struct iser_conn *ib_conn; 538 539 err = iser_conn_init(&ib_conn); 540 if (err) 541 goto out; 542 543 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, non_blocking); 544 if (!err) 545 *ep_handle = (__u64)(unsigned long)ib_conn; 546 547out: 548 return err; 549} 550 551static int 552iscsi_iser_ep_poll(__u64 ep_handle, int timeout_ms) 553{ 554 struct iser_conn *ib_conn = iscsi_iser_ib_conn_lookup(ep_handle); 555 int rc; 556 557 if (!ib_conn) 558 return -EINVAL; 559 560 rc = wait_event_interruptible_timeout(ib_conn->wait, 561 ib_conn->state == ISER_CONN_UP, 562 msecs_to_jiffies(timeout_ms)); 563 564 /* if conn establishment failed, return error code to iscsi */ 565 if (!rc && 566 (ib_conn->state == ISER_CONN_TERMINATING || 567 ib_conn->state == ISER_CONN_DOWN)) 568 rc = -1; 569 570 iser_err("ib conn %p rc = %d\n", ib_conn, rc); 571 572 if (rc > 0) 573 return 1; /* success, this is the equivalent of POLLOUT */ 574 else if (!rc) 575 return 0; /* timeout */ 576 else 577 return rc; /* signal */ 578} 579 580static void 581iscsi_iser_ep_disconnect(__u64 ep_handle) 582{ 583 struct iser_conn *ib_conn; 584 585 ib_conn = iscsi_iser_ib_conn_lookup(ep_handle); 586 if (!ib_conn) 587 return; 588 589 if (ib_conn->iser_conn) 590 /* 591 * Must suspend xmit path if the ep is bound to the 592 * iscsi_conn, so we know we are not accessing the ib_conn 593 * when we free it. 594 * 595 * This may not be bound if the ep poll failed. 596 */ 597 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); 598 599 600 iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); 601 iser_conn_terminate(ib_conn); 602} 603 604static struct scsi_host_template iscsi_iser_sht = { 605 .module = THIS_MODULE, 606 .name = "iSCSI Initiator over iSER, v." DRV_VER, 607 .queuecommand = iscsi_queuecommand, 608 .change_queue_depth = iscsi_change_queue_depth, 609 .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, 610 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, 611 .max_sectors = 1024, 612 .cmd_per_lun = ISCSI_MAX_CMD_PER_LUN, 613 .eh_abort_handler = iscsi_eh_abort, 614 .eh_device_reset_handler= iscsi_eh_device_reset, 615 .eh_host_reset_handler = iscsi_eh_host_reset, 616 .use_clustering = DISABLE_CLUSTERING, 617 .proc_name = "iscsi_iser", 618 .this_id = -1, 619}; 620 621static struct iscsi_transport iscsi_iser_transport = { 622 .owner = THIS_MODULE, 623 .name = "iser", 624 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, 625 .param_mask = ISCSI_MAX_RECV_DLENGTH | 626 ISCSI_MAX_XMIT_DLENGTH | 627 ISCSI_HDRDGST_EN | 628 ISCSI_DATADGST_EN | 629 ISCSI_INITIAL_R2T_EN | 630 ISCSI_MAX_R2T | 631 ISCSI_IMM_DATA_EN | 632 ISCSI_FIRST_BURST | 633 ISCSI_MAX_BURST | 634 ISCSI_PDU_INORDER_EN | 635 ISCSI_DATASEQ_INORDER_EN | 636 ISCSI_EXP_STATSN | 637 ISCSI_PERSISTENT_PORT | 638 ISCSI_PERSISTENT_ADDRESS | 639 ISCSI_TARGET_NAME | ISCSI_TPGT | 640 ISCSI_USERNAME | ISCSI_PASSWORD | 641 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | 642 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | 643 ISCSI_PING_TMO | ISCSI_RECV_TMO, 644 .host_param_mask = ISCSI_HOST_HWADDRESS | 645 ISCSI_HOST_NETDEV_NAME | 646 ISCSI_HOST_INITIATOR_NAME, 647 /* session management */ 648 .create_session = iscsi_iser_session_create, 649 .destroy_session = iscsi_iser_session_destroy, 650 /* connection management */ 651 .create_conn = iscsi_iser_conn_create, 652 .bind_conn = iscsi_iser_conn_bind, 653 .destroy_conn = iscsi_iser_conn_destroy, 654 .set_param = iscsi_iser_set_param, 655 .get_conn_param = iscsi_conn_get_param, 656 .get_session_param = iscsi_session_get_param, 657 .start_conn = iscsi_iser_conn_start, 658 .stop_conn = iscsi_iser_conn_stop, 659 /* iscsi host params */ 660 .get_host_param = iscsi_host_get_param, 661 .set_host_param = iscsi_host_set_param, 662 /* IO */ 663 .send_pdu = iscsi_conn_send_pdu, 664 .get_stats = iscsi_iser_conn_get_stats, 665 .init_task = iscsi_iser_task_init, 666 .xmit_task = iscsi_iser_task_xmit, 667 .cleanup_task = iscsi_iser_cleanup_task, 668 /* recovery */ 669 .session_recovery_timedout = iscsi_session_recovery_timedout, 670 671 .ep_connect = iscsi_iser_ep_connect, 672 .ep_poll = iscsi_iser_ep_poll, 673 .ep_disconnect = iscsi_iser_ep_disconnect 674}; 675 676static int __init iser_init(void) 677{ 678 int err; 679 680 iser_dbg("Starting iSER datamover...\n"); 681 682 if (iscsi_max_lun < 1) { 683 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); 684 return -EINVAL; 685 } 686 687 memset(&ig, 0, sizeof(struct iser_global)); 688 689 ig.desc_cache = kmem_cache_create("iser_descriptors", 690 sizeof (struct iser_desc), 691 0, SLAB_HWCACHE_ALIGN, 692 NULL); 693 if (ig.desc_cache == NULL) 694 return -ENOMEM; 695 696 /* device init is called only after the first addr resolution */ 697 mutex_init(&ig.device_list_mutex); 698 INIT_LIST_HEAD(&ig.device_list); 699 mutex_init(&ig.connlist_mutex); 700 INIT_LIST_HEAD(&ig.connlist); 701 702 iscsi_iser_scsi_transport = iscsi_register_transport( 703 &iscsi_iser_transport); 704 if (!iscsi_iser_scsi_transport) { 705 iser_err("iscsi_register_transport failed\n"); 706 err = -EINVAL; 707 goto register_transport_failure; 708 } 709 710 return 0; 711 712register_transport_failure: 713 kmem_cache_destroy(ig.desc_cache); 714 715 return err; 716} 717 718static void __exit iser_exit(void) 719{ 720 iser_dbg("Removing iSER datamover...\n"); 721 iscsi_unregister_transport(&iscsi_iser_transport); 722 kmem_cache_destroy(ig.desc_cache); 723} 724 725module_init(iser_init); 726module_exit(iser_exit); 727