2 * iSCSI Initiator over iSER Data-Path
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 * Copyright (c) 2013 Mellanox Technologies. All rights reserved.
9 * maintained by openib-general@openib.org
11 * This software is available to you under a choice of one of two
12 * licenses. You may choose to be licensed under the terms of the GNU
13 * General Public License (GPL) Version 2, available from the file
14 * COPYING in the main directory of this source tree, or the
15 * OpenIB.org BSD license below:
17 * Redistribution and use in source and binary forms, with or
18 * without modification, are permitted provided that the following
21 * - Redistributions of source code must retain the above
22 * copyright notice, this list of conditions and the following
25 * - Redistributions in binary form must reproduce the above
26 * copyright notice, this list of conditions and the following
27 * disclaimer in the documentation and/or other materials
28 * provided with the distribution.
30 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
31 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
32 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
33 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
34 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
35 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
36 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
48 #include <linux/types.h>
49 #include <linux/list.h>
50 #include <linux/hardirq.h>
51 #include <linux/kfifo.h>
52 #include <linux/blkdev.h>
53 #include <linux/init.h>
54 #include <linux/ioctl.h>
55 #include <linux/cdev.h>
57 #include <linux/net.h>
58 #include <linux/scatterlist.h>
59 #include <linux/delay.h>
60 #include <linux/slab.h>
61 #include <linux/module.h>
65 #include <asm/uaccess.h>
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>
75 #include "iscsi_iser.h"
77 static struct scsi_host_template iscsi_iser_sht;
78 static struct iscsi_transport iscsi_iser_transport;
79 static struct scsi_transport_template *iscsi_iser_scsi_transport;
81 static unsigned int iscsi_max_lun = 512;
82 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
84 int iser_debug_level = 0;
86 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover");
87 MODULE_LICENSE("Dual BSD/GPL");
88 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
89 MODULE_VERSION(DRV_VER);
91 module_param_named(debug_level, iser_debug_level, int, 0644);
92 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
94 struct iser_global ig;
97 iscsi_iser_recv(struct iscsi_conn *conn,
98 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
104 /* verify PDU length */
105 datalen = ntoh24(hdr->dlength);
106 if (datalen > rx_data_len || (datalen + 4) < rx_data_len) {
107 iser_err("wrong datalen %d (hdr), %d (IB)\n",
108 datalen, rx_data_len);
109 rc = ISCSI_ERR_DATALEN;
113 if (datalen != rx_data_len)
114 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",
115 datalen, rx_data_len);
118 ahslen = hdr->hlength * 4;
120 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
121 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
126 iscsi_conn_failure(conn, rc);
129 static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
131 struct iscsi_iser_task *iser_task = task->dd_data;
133 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
134 task->hdr_max = sizeof(iser_task->desc.iscsi_header);
138 int iser_initialize_task_headers(struct iscsi_task *task,
139 struct iser_tx_desc *tx_desc)
141 struct iscsi_iser_conn *iser_conn = task->conn->dd_data;
142 struct iser_device *device = iser_conn->ib_conn->device;
143 struct iscsi_iser_task *iser_task = task->dd_data;
146 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
147 ISER_HEADERS_LEN, DMA_TO_DEVICE);
148 if (ib_dma_mapping_error(device->ib_device, dma_addr))
151 tx_desc->dma_addr = dma_addr;
152 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
153 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
154 tx_desc->tx_sg[0].lkey = device->mr->lkey;
156 iser_task->iser_conn = iser_conn;
160 * iscsi_iser_task_init - Initialize task
163 * Initialize the task for the scsi command or mgmt command.
166 iscsi_iser_task_init(struct iscsi_task *task)
168 struct iscsi_iser_task *iser_task = task->dd_data;
170 if (iser_initialize_task_headers(task, &iser_task->desc))
177 iser_task->command_sent = 0;
178 iser_task_rdma_init(iser_task);
183 * iscsi_iser_mtask_xmit - xmit management(immediate) task
184 * @conn: iscsi connection
185 * @task: task management task
188 * The function can return -EAGAIN in which case caller must
189 * call it again later, or recover. '0' return code means successful
194 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
198 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
200 error = iser_send_control(conn, task);
202 /* since iser xmits control with zero copy, tasks can not be recycled
203 * right after sending them.
204 * The recycling scheme is based on whether a response is expected
205 * - if yes, the task is recycled at iscsi_complete_pdu
206 * - if no, the task is recycled at iser_snd_completion
212 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
213 struct iscsi_task *task)
215 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
216 struct iscsi_data hdr;
219 /* Send data-out PDUs while there's still unsolicited data to send */
220 while (iscsi_task_has_unsol_data(task)) {
221 iscsi_prep_data_out_pdu(task, r2t, &hdr);
222 iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
223 hdr.itt, r2t->data_count);
225 /* the buffer description has been passed with the command */
226 /* Send the command */
227 error = iser_send_data_out(conn, task, &hdr);
230 goto iscsi_iser_task_xmit_unsol_data_exit;
232 r2t->sent += r2t->data_count;
233 iser_dbg("Need to send %d more as data-out PDUs\n",
234 r2t->data_length - r2t->sent);
237 iscsi_iser_task_xmit_unsol_data_exit:
242 iscsi_iser_task_xmit(struct iscsi_task *task)
244 struct iscsi_conn *conn = task->conn;
245 struct iscsi_iser_task *iser_task = task->dd_data;
249 return iscsi_iser_mtask_xmit(conn, task);
251 if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
252 BUG_ON(scsi_bufflen(task->sc) == 0);
254 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
255 task->itt, scsi_bufflen(task->sc),
256 task->imm_count, task->unsol_r2t.data_length);
259 iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
260 conn->id, task->itt);
262 /* Send the cmd PDU */
263 if (!iser_task->command_sent) {
264 error = iser_send_command(conn, task);
266 goto iscsi_iser_task_xmit_exit;
267 iser_task->command_sent = 1;
270 /* Send unsolicited data-out PDU(s) if necessary */
271 if (iscsi_task_has_unsol_data(task))
272 error = iscsi_iser_task_xmit_unsol_data(conn, task);
274 iscsi_iser_task_xmit_exit:
278 static void iscsi_iser_cleanup_task(struct iscsi_task *task)
280 struct iscsi_iser_task *iser_task = task->dd_data;
281 struct iser_tx_desc *tx_desc = &iser_task->desc;
283 struct iscsi_iser_conn *iser_conn = task->conn->dd_data;
284 struct iser_device *device = iser_conn->ib_conn->device;
286 ib_dma_unmap_single(device->ib_device,
287 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
289 /* mgmt tasks do not need special cleanup */
293 if (iser_task->status == ISER_TASK_STATUS_STARTED) {
294 iser_task->status = ISER_TASK_STATUS_COMPLETED;
295 iser_task_rdma_finalize(iser_task);
299 static struct iscsi_cls_conn *
300 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
302 struct iscsi_conn *conn;
303 struct iscsi_cls_conn *cls_conn;
304 struct iscsi_iser_conn *iser_conn;
306 cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx);
309 conn = cls_conn->dd_data;
312 * due to issues with the login code re iser sematics
313 * this not set in iscsi_conn_setup - FIXME
315 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
317 iser_conn = conn->dd_data;
318 conn->dd_data = iser_conn;
319 iser_conn->iscsi_conn = conn;
325 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
327 struct iscsi_conn *conn = cls_conn->dd_data;
328 struct iscsi_iser_conn *iser_conn = conn->dd_data;
329 struct iser_conn *ib_conn = iser_conn->ib_conn;
331 iscsi_conn_teardown(cls_conn);
333 * Userspace will normally call the stop callback and
334 * already have freed the ib_conn, but if it goofed up then
338 ib_conn->iser_conn = NULL;
339 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */
344 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
345 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
348 struct iscsi_conn *conn = cls_conn->dd_data;
349 struct iscsi_iser_conn *iser_conn;
350 struct iser_conn *ib_conn;
351 struct iscsi_endpoint *ep;
354 error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
358 /* the transport ep handle comes from user space so it must be
359 * verified against the global ib connections list */
360 ep = iscsi_lookup_endpoint(transport_eph);
362 iser_err("can't bind eph %llx\n",
363 (unsigned long long)transport_eph);
366 ib_conn = ep->dd_data;
368 if (iser_alloc_rx_descriptors(ib_conn))
371 /* binds the iSER connection retrieved from the previously
372 * connected ep_handle to the iSCSI layer connection. exchanges
373 * connection pointers */
374 iser_info("binding iscsi/iser conn %p %p to ib_conn %p\n",
375 conn, conn->dd_data, ib_conn);
376 iser_conn = conn->dd_data;
377 ib_conn->iser_conn = iser_conn;
378 iser_conn->ib_conn = ib_conn;
379 iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */
384 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
386 struct iscsi_conn *conn = cls_conn->dd_data;
387 struct iscsi_iser_conn *iser_conn = conn->dd_data;
388 struct iser_conn *ib_conn = iser_conn->ib_conn;
391 * Userspace may have goofed up and not bound the connection or
392 * might have only partially setup the connection.
395 iscsi_conn_stop(cls_conn, flag);
397 * There is no unbind event so the stop callback
398 * must release the ref from the bind.
400 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */
402 iser_conn->ib_conn = NULL;
405 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
407 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
409 iscsi_session_teardown(cls_session);
410 iscsi_host_remove(shost);
411 iscsi_host_free(shost);
414 static struct iscsi_cls_session *
415 iscsi_iser_session_create(struct iscsi_endpoint *ep,
416 uint16_t cmds_max, uint16_t qdepth,
417 uint32_t initial_cmdsn)
419 struct iscsi_cls_session *cls_session;
420 struct iscsi_session *session;
421 struct Scsi_Host *shost;
422 struct iser_conn *ib_conn;
424 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
427 shost->transportt = iscsi_iser_scsi_transport;
428 shost->max_lun = iscsi_max_lun;
430 shost->max_channel = 0;
431 shost->max_cmd_len = 16;
434 * older userspace tools (before 2.0-870) did not pass us
435 * the leading conn's ep so this will be NULL;
438 ib_conn = ep->dd_data;
440 if (iscsi_host_add(shost,
441 ep ? ib_conn->device->ib_device->dma_device : NULL))
445 * we do not support setting can_queue cmd_per_lun from userspace yet
446 * because we preallocate so many resources
448 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
449 ISCSI_DEF_XMIT_CMDS_MAX, 0,
450 sizeof(struct iscsi_iser_task),
454 session = cls_session->dd_data;
456 shost->can_queue = session->scsi_cmds_max;
460 iscsi_host_remove(shost);
462 iscsi_host_free(shost);
467 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
468 enum iscsi_param param, char *buf, int buflen)
473 case ISCSI_PARAM_MAX_RECV_DLENGTH:
476 case ISCSI_PARAM_HDRDGST_EN:
477 sscanf(buf, "%d", &value);
479 iser_err("DataDigest wasn't negotiated to None");
483 case ISCSI_PARAM_DATADGST_EN:
484 sscanf(buf, "%d", &value);
486 iser_err("DataDigest wasn't negotiated to None");
490 case ISCSI_PARAM_IFMARKER_EN:
491 sscanf(buf, "%d", &value);
493 iser_err("IFMarker wasn't negotiated to No");
497 case ISCSI_PARAM_OFMARKER_EN:
498 sscanf(buf, "%d", &value);
500 iser_err("OFMarker wasn't negotiated to No");
505 return iscsi_set_param(cls_conn, param, buf, buflen);
512 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
514 struct iscsi_conn *conn = cls_conn->dd_data;
516 stats->txdata_octets = conn->txdata_octets;
517 stats->rxdata_octets = conn->rxdata_octets;
518 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
519 stats->dataout_pdus = conn->dataout_pdus_cnt;
520 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
521 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
522 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
523 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
524 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
525 stats->custom_length = 4;
526 strcpy(stats->custom[0].desc, "qp_tx_queue_full");
527 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
528 strcpy(stats->custom[1].desc, "fmr_map_not_avail");
529 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
530 strcpy(stats->custom[2].desc, "eh_abort_cnt");
531 stats->custom[2].value = conn->eh_abort_cnt;
532 strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
533 stats->custom[3].value = conn->fmr_unalign_cnt;
536 static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
537 enum iscsi_param param, char *buf)
539 struct iser_conn *ib_conn = ep->dd_data;
543 case ISCSI_PARAM_CONN_PORT:
544 case ISCSI_PARAM_CONN_ADDRESS:
545 if (!ib_conn || !ib_conn->cma_id)
548 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
549 &ib_conn->cma_id->route.addr.dst_addr,
559 static struct iscsi_endpoint *
560 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
564 struct iser_conn *ib_conn;
565 struct iscsi_endpoint *ep;
567 ep = iscsi_create_endpoint(sizeof(*ib_conn));
569 return ERR_PTR(-ENOMEM);
571 ib_conn = ep->dd_data;
573 iser_conn_init(ib_conn);
575 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr,
584 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
586 struct iser_conn *ib_conn;
589 ib_conn = ep->dd_data;
590 rc = wait_event_interruptible_timeout(ib_conn->wait,
591 ib_conn->state == ISER_CONN_UP,
592 msecs_to_jiffies(timeout_ms));
594 /* if conn establishment failed, return error code to iscsi */
596 (ib_conn->state == ISER_CONN_TERMINATING ||
597 ib_conn->state == ISER_CONN_DOWN))
600 iser_info("ib conn %p rc = %d\n", ib_conn, rc);
603 return 1; /* success, this is the equivalent of POLLOUT */
605 return 0; /* timeout */
607 return rc; /* signal */
611 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
613 struct iser_conn *ib_conn;
615 ib_conn = ep->dd_data;
616 if (ib_conn->iser_conn)
618 * Must suspend xmit path if the ep is bound to the
619 * iscsi_conn, so we know we are not accessing the ib_conn
622 * This may not be bound if the ep poll failed.
624 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn);
627 iser_info("ib conn %p state %d\n", ib_conn, ib_conn->state);
628 iser_conn_terminate(ib_conn);
631 static umode_t iser_attr_is_visible(int param_type, int param)
633 switch (param_type) {
634 case ISCSI_HOST_PARAM:
636 case ISCSI_HOST_PARAM_NETDEV_NAME:
637 case ISCSI_HOST_PARAM_HWADDRESS:
638 case ISCSI_HOST_PARAM_INITIATOR_NAME:
645 case ISCSI_PARAM_MAX_RECV_DLENGTH:
646 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
647 case ISCSI_PARAM_HDRDGST_EN:
648 case ISCSI_PARAM_DATADGST_EN:
649 case ISCSI_PARAM_CONN_ADDRESS:
650 case ISCSI_PARAM_CONN_PORT:
651 case ISCSI_PARAM_EXP_STATSN:
652 case ISCSI_PARAM_PERSISTENT_ADDRESS:
653 case ISCSI_PARAM_PERSISTENT_PORT:
654 case ISCSI_PARAM_PING_TMO:
655 case ISCSI_PARAM_RECV_TMO:
656 case ISCSI_PARAM_INITIAL_R2T_EN:
657 case ISCSI_PARAM_MAX_R2T:
658 case ISCSI_PARAM_IMM_DATA_EN:
659 case ISCSI_PARAM_FIRST_BURST:
660 case ISCSI_PARAM_MAX_BURST:
661 case ISCSI_PARAM_PDU_INORDER_EN:
662 case ISCSI_PARAM_DATASEQ_INORDER_EN:
663 case ISCSI_PARAM_TARGET_NAME:
664 case ISCSI_PARAM_TPGT:
665 case ISCSI_PARAM_USERNAME:
666 case ISCSI_PARAM_PASSWORD:
667 case ISCSI_PARAM_USERNAME_IN:
668 case ISCSI_PARAM_PASSWORD_IN:
669 case ISCSI_PARAM_FAST_ABORT:
670 case ISCSI_PARAM_ABORT_TMO:
671 case ISCSI_PARAM_LU_RESET_TMO:
672 case ISCSI_PARAM_TGT_RESET_TMO:
673 case ISCSI_PARAM_IFACE_NAME:
674 case ISCSI_PARAM_INITIATOR_NAME:
675 case ISCSI_PARAM_DISCOVERY_SESS:
685 static struct scsi_host_template iscsi_iser_sht = {
686 .module = THIS_MODULE,
687 .name = "iSCSI Initiator over iSER",
688 .queuecommand = iscsi_queuecommand,
689 .change_queue_depth = iscsi_change_queue_depth,
690 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE,
692 .cmd_per_lun = ISER_DEF_CMD_PER_LUN,
693 .eh_abort_handler = iscsi_eh_abort,
694 .eh_device_reset_handler= iscsi_eh_device_reset,
695 .eh_target_reset_handler = iscsi_eh_recover_target,
696 .target_alloc = iscsi_target_alloc,
697 .use_clustering = DISABLE_CLUSTERING,
698 .proc_name = "iscsi_iser",
702 static struct iscsi_transport iscsi_iser_transport = {
703 .owner = THIS_MODULE,
705 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO,
706 /* session management */
707 .create_session = iscsi_iser_session_create,
708 .destroy_session = iscsi_iser_session_destroy,
709 /* connection management */
710 .create_conn = iscsi_iser_conn_create,
711 .bind_conn = iscsi_iser_conn_bind,
712 .destroy_conn = iscsi_iser_conn_destroy,
713 .attr_is_visible = iser_attr_is_visible,
714 .set_param = iscsi_iser_set_param,
715 .get_conn_param = iscsi_conn_get_param,
716 .get_ep_param = iscsi_iser_get_ep_param,
717 .get_session_param = iscsi_session_get_param,
718 .start_conn = iscsi_conn_start,
719 .stop_conn = iscsi_iser_conn_stop,
720 /* iscsi host params */
721 .get_host_param = iscsi_host_get_param,
722 .set_host_param = iscsi_host_set_param,
724 .send_pdu = iscsi_conn_send_pdu,
725 .get_stats = iscsi_iser_conn_get_stats,
726 .init_task = iscsi_iser_task_init,
727 .xmit_task = iscsi_iser_task_xmit,
728 .cleanup_task = iscsi_iser_cleanup_task,
729 .alloc_pdu = iscsi_iser_pdu_alloc,
731 .session_recovery_timedout = iscsi_session_recovery_timedout,
733 .ep_connect = iscsi_iser_ep_connect,
734 .ep_poll = iscsi_iser_ep_poll,
735 .ep_disconnect = iscsi_iser_ep_disconnect
738 static int __init iser_init(void)
742 iser_dbg("Starting iSER datamover...\n");
744 if (iscsi_max_lun < 1) {
745 iser_err("Invalid max_lun value of %u\n", iscsi_max_lun);
749 memset(&ig, 0, sizeof(struct iser_global));
751 ig.desc_cache = kmem_cache_create("iser_descriptors",
752 sizeof(struct iser_tx_desc),
753 0, SLAB_HWCACHE_ALIGN,
755 if (ig.desc_cache == NULL)
758 /* device init is called only after the first addr resolution */
759 mutex_init(&ig.device_list_mutex);
760 INIT_LIST_HEAD(&ig.device_list);
761 mutex_init(&ig.connlist_mutex);
762 INIT_LIST_HEAD(&ig.connlist);
764 iscsi_iser_scsi_transport = iscsi_register_transport(
765 &iscsi_iser_transport);
766 if (!iscsi_iser_scsi_transport) {
767 iser_err("iscsi_register_transport failed\n");
769 goto register_transport_failure;
774 register_transport_failure:
775 kmem_cache_destroy(ig.desc_cache);
780 static void __exit iser_exit(void)
782 iser_dbg("Removing iSER datamover...\n");
783 iscsi_unregister_transport(&iscsi_iser_transport);
784 kmem_cache_destroy(ig.desc_cache);
787 module_init(iser_init);
788 module_exit(iser_exit);