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) 2013-2014 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;
85 bool iser_pi_enable = false;
86 int iser_pi_guard = 0;
88 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover");
89 MODULE_LICENSE("Dual BSD/GPL");
90 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
91 MODULE_VERSION(DRV_VER);
93 module_param_named(debug_level, iser_debug_level, int, 0644);
94 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
96 module_param_named(pi_enable, iser_pi_enable, bool, 0644);
97 MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)");
99 module_param_named(pi_guard, iser_pi_guard, int, 0644);
100 MODULE_PARM_DESC(pi_guard, "T10-PI guard_type, 0:CRC|1:IP_CSUM (default:CRC)");
102 struct iser_global ig;
105 iscsi_iser_recv(struct iscsi_conn *conn,
106 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
112 /* verify PDU length */
113 datalen = ntoh24(hdr->dlength);
114 if (datalen > rx_data_len || (datalen + 4) < rx_data_len) {
115 iser_err("wrong datalen %d (hdr), %d (IB)\n",
116 datalen, rx_data_len);
117 rc = ISCSI_ERR_DATALEN;
121 if (datalen != rx_data_len)
122 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",
123 datalen, rx_data_len);
126 ahslen = hdr->hlength * 4;
128 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
129 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
134 iscsi_conn_failure(conn, rc);
137 static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
139 struct iscsi_iser_task *iser_task = task->dd_data;
141 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
142 task->hdr_max = sizeof(iser_task->desc.iscsi_header);
146 int iser_initialize_task_headers(struct iscsi_task *task,
147 struct iser_tx_desc *tx_desc)
149 struct iser_conn *ib_conn = task->conn->dd_data;
150 struct iser_device *device = ib_conn->device;
151 struct iscsi_iser_task *iser_task = task->dd_data;
154 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
155 ISER_HEADERS_LEN, DMA_TO_DEVICE);
156 if (ib_dma_mapping_error(device->ib_device, dma_addr))
159 tx_desc->dma_addr = dma_addr;
160 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
161 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
162 tx_desc->tx_sg[0].lkey = device->mr->lkey;
164 iser_task->ib_conn = ib_conn;
168 * iscsi_iser_task_init - Initialize task
171 * Initialize the task for the scsi command or mgmt command.
174 iscsi_iser_task_init(struct iscsi_task *task)
176 struct iscsi_iser_task *iser_task = task->dd_data;
178 if (iser_initialize_task_headers(task, &iser_task->desc))
185 iser_task->command_sent = 0;
186 iser_task_rdma_init(iser_task);
187 iser_task->sc = task->sc;
193 * iscsi_iser_mtask_xmit - xmit management(immediate) task
194 * @conn: iscsi connection
195 * @task: task management task
198 * The function can return -EAGAIN in which case caller must
199 * call it again later, or recover. '0' return code means successful
204 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
208 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
210 error = iser_send_control(conn, task);
212 /* since iser xmits control with zero copy, tasks can not be recycled
213 * right after sending them.
214 * The recycling scheme is based on whether a response is expected
215 * - if yes, the task is recycled at iscsi_complete_pdu
216 * - if no, the task is recycled at iser_snd_completion
222 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
223 struct iscsi_task *task)
225 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
226 struct iscsi_data hdr;
229 /* Send data-out PDUs while there's still unsolicited data to send */
230 while (iscsi_task_has_unsol_data(task)) {
231 iscsi_prep_data_out_pdu(task, r2t, &hdr);
232 iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
233 hdr.itt, r2t->data_count);
235 /* the buffer description has been passed with the command */
236 /* Send the command */
237 error = iser_send_data_out(conn, task, &hdr);
240 goto iscsi_iser_task_xmit_unsol_data_exit;
242 r2t->sent += r2t->data_count;
243 iser_dbg("Need to send %d more as data-out PDUs\n",
244 r2t->data_length - r2t->sent);
247 iscsi_iser_task_xmit_unsol_data_exit:
252 iscsi_iser_task_xmit(struct iscsi_task *task)
254 struct iscsi_conn *conn = task->conn;
255 struct iscsi_iser_task *iser_task = task->dd_data;
259 return iscsi_iser_mtask_xmit(conn, task);
261 if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
262 BUG_ON(scsi_bufflen(task->sc) == 0);
264 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
265 task->itt, scsi_bufflen(task->sc),
266 task->imm_count, task->unsol_r2t.data_length);
269 iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
270 conn->id, task->itt);
272 /* Send the cmd PDU */
273 if (!iser_task->command_sent) {
274 error = iser_send_command(conn, task);
276 goto iscsi_iser_task_xmit_exit;
277 iser_task->command_sent = 1;
280 /* Send unsolicited data-out PDU(s) if necessary */
281 if (iscsi_task_has_unsol_data(task))
282 error = iscsi_iser_task_xmit_unsol_data(conn, task);
284 iscsi_iser_task_xmit_exit:
288 static void iscsi_iser_cleanup_task(struct iscsi_task *task)
290 struct iscsi_iser_task *iser_task = task->dd_data;
291 struct iser_tx_desc *tx_desc = &iser_task->desc;
292 struct iser_conn *ib_conn = task->conn->dd_data;
293 struct iser_device *device = ib_conn->device;
295 ib_dma_unmap_single(device->ib_device,
296 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
298 /* mgmt tasks do not need special cleanup */
302 if (iser_task->status == ISER_TASK_STATUS_STARTED) {
303 iser_task->status = ISER_TASK_STATUS_COMPLETED;
304 iser_task_rdma_finalize(iser_task);
308 static u8 iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector)
310 struct iscsi_iser_task *iser_task = task->dd_data;
312 if (iser_task->dir[ISER_DIR_IN])
313 return iser_check_task_pi_status(iser_task, ISER_DIR_IN,
316 return iser_check_task_pi_status(iser_task, ISER_DIR_OUT,
320 static struct iscsi_cls_conn *
321 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
323 struct iscsi_conn *conn;
324 struct iscsi_cls_conn *cls_conn;
326 cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx);
329 conn = cls_conn->dd_data;
332 * due to issues with the login code re iser sematics
333 * this not set in iscsi_conn_setup - FIXME
335 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
341 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
343 struct iscsi_conn *conn = cls_conn->dd_data;
344 struct iser_conn *ib_conn = conn->dd_data;
346 iscsi_conn_teardown(cls_conn);
348 * Userspace will normally call the stop callback and
349 * already have freed the ib_conn, but if it goofed up then
353 ib_conn->iscsi_conn = NULL;
354 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */
359 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
360 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
363 struct iscsi_conn *conn = cls_conn->dd_data;
364 struct iscsi_session *session;
365 struct iser_conn *ib_conn;
366 struct iscsi_endpoint *ep;
369 error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
373 /* the transport ep handle comes from user space so it must be
374 * verified against the global ib connections list */
375 ep = iscsi_lookup_endpoint(transport_eph);
377 iser_err("can't bind eph %llx\n",
378 (unsigned long long)transport_eph);
381 ib_conn = ep->dd_data;
383 session = conn->session;
384 if (iser_alloc_rx_descriptors(ib_conn, session))
387 /* binds the iSER connection retrieved from the previously
388 * connected ep_handle to the iSCSI layer connection. exchanges
389 * connection pointers */
390 iser_info("binding iscsi conn %p to ib_conn %p\n", conn, ib_conn);
392 conn->dd_data = ib_conn;
393 ib_conn->iscsi_conn = conn;
395 iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */
400 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
402 struct iscsi_conn *conn = cls_conn->dd_data;
403 struct iser_conn *ib_conn = conn->dd_data;
406 * Userspace may have goofed up and not bound the connection or
407 * might have only partially setup the connection.
410 iscsi_conn_stop(cls_conn, flag);
412 * There is no unbind event so the stop callback
413 * must release the ref from the bind.
415 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */
417 conn->dd_data = NULL;
420 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
422 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
424 iscsi_session_teardown(cls_session);
425 iscsi_host_remove(shost);
426 iscsi_host_free(shost);
429 static inline unsigned int
430 iser_dif_prot_caps(int prot_caps)
432 return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? SHOST_DIF_TYPE1_PROTECTION |
433 SHOST_DIX_TYPE1_PROTECTION : 0) |
434 ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? SHOST_DIF_TYPE2_PROTECTION |
435 SHOST_DIX_TYPE2_PROTECTION : 0) |
436 ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? SHOST_DIF_TYPE3_PROTECTION |
437 SHOST_DIX_TYPE3_PROTECTION : 0);
440 static struct iscsi_cls_session *
441 iscsi_iser_session_create(struct iscsi_endpoint *ep,
442 uint16_t cmds_max, uint16_t qdepth,
443 uint32_t initial_cmdsn)
445 struct iscsi_cls_session *cls_session;
446 struct iscsi_session *session;
447 struct Scsi_Host *shost;
448 struct iser_conn *ib_conn = NULL;
450 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
453 shost->transportt = iscsi_iser_scsi_transport;
454 shost->cmd_per_lun = qdepth;
455 shost->max_lun = iscsi_max_lun;
457 shost->max_channel = 0;
458 shost->max_cmd_len = 16;
461 * older userspace tools (before 2.0-870) did not pass us
462 * the leading conn's ep so this will be NULL;
465 ib_conn = ep->dd_data;
466 if (ib_conn->pi_support) {
467 u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap;
469 scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps));
471 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
473 scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC);
477 if (iscsi_host_add(shost,
478 ep ? ib_conn->device->ib_device->dma_device : NULL))
481 if (cmds_max > ISER_DEF_XMIT_CMDS_MAX) {
482 iser_info("cmds_max changed from %u to %u\n",
483 cmds_max, ISER_DEF_XMIT_CMDS_MAX);
484 cmds_max = ISER_DEF_XMIT_CMDS_MAX;
487 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
489 sizeof(struct iscsi_iser_task),
493 session = cls_session->dd_data;
495 shost->can_queue = session->scsi_cmds_max;
499 iscsi_host_remove(shost);
501 iscsi_host_free(shost);
506 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
507 enum iscsi_param param, char *buf, int buflen)
512 case ISCSI_PARAM_MAX_RECV_DLENGTH:
515 case ISCSI_PARAM_HDRDGST_EN:
516 sscanf(buf, "%d", &value);
518 iser_err("DataDigest wasn't negotiated to None");
522 case ISCSI_PARAM_DATADGST_EN:
523 sscanf(buf, "%d", &value);
525 iser_err("DataDigest wasn't negotiated to None");
529 case ISCSI_PARAM_IFMARKER_EN:
530 sscanf(buf, "%d", &value);
532 iser_err("IFMarker wasn't negotiated to No");
536 case ISCSI_PARAM_OFMARKER_EN:
537 sscanf(buf, "%d", &value);
539 iser_err("OFMarker wasn't negotiated to No");
544 return iscsi_set_param(cls_conn, param, buf, buflen);
551 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
553 struct iscsi_conn *conn = cls_conn->dd_data;
555 stats->txdata_octets = conn->txdata_octets;
556 stats->rxdata_octets = conn->rxdata_octets;
557 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
558 stats->dataout_pdus = conn->dataout_pdus_cnt;
559 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
560 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
561 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
562 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
563 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
564 stats->custom_length = 4;
565 strcpy(stats->custom[0].desc, "qp_tx_queue_full");
566 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
567 strcpy(stats->custom[1].desc, "fmr_map_not_avail");
568 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
569 strcpy(stats->custom[2].desc, "eh_abort_cnt");
570 stats->custom[2].value = conn->eh_abort_cnt;
571 strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
572 stats->custom[3].value = conn->fmr_unalign_cnt;
575 static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
576 enum iscsi_param param, char *buf)
578 struct iser_conn *ib_conn = ep->dd_data;
582 case ISCSI_PARAM_CONN_PORT:
583 case ISCSI_PARAM_CONN_ADDRESS:
584 if (!ib_conn || !ib_conn->cma_id)
587 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
588 &ib_conn->cma_id->route.addr.dst_addr,
598 static struct iscsi_endpoint *
599 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
603 struct iser_conn *ib_conn;
604 struct iscsi_endpoint *ep;
606 ep = iscsi_create_endpoint(sizeof(*ib_conn));
608 return ERR_PTR(-ENOMEM);
610 ib_conn = ep->dd_data;
612 iser_conn_init(ib_conn);
614 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr,
623 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
625 struct iser_conn *ib_conn;
628 ib_conn = ep->dd_data;
629 rc = wait_event_interruptible_timeout(ib_conn->wait,
630 ib_conn->state == ISER_CONN_UP,
631 msecs_to_jiffies(timeout_ms));
633 /* if conn establishment failed, return error code to iscsi */
635 (ib_conn->state == ISER_CONN_TERMINATING ||
636 ib_conn->state == ISER_CONN_DOWN))
639 iser_info("ib conn %p rc = %d\n", ib_conn, rc);
642 return 1; /* success, this is the equivalent of POLLOUT */
644 return 0; /* timeout */
646 return rc; /* signal */
650 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
652 struct iser_conn *ib_conn;
654 ib_conn = ep->dd_data;
655 if (ib_conn->iscsi_conn)
657 * Must suspend xmit path if the ep is bound to the
658 * iscsi_conn, so we know we are not accessing the ib_conn
661 * This may not be bound if the ep poll failed.
663 iscsi_suspend_tx(ib_conn->iscsi_conn);
666 iser_info("ib conn %p state %d\n", ib_conn, ib_conn->state);
667 iser_conn_terminate(ib_conn);
670 static umode_t iser_attr_is_visible(int param_type, int param)
672 switch (param_type) {
673 case ISCSI_HOST_PARAM:
675 case ISCSI_HOST_PARAM_NETDEV_NAME:
676 case ISCSI_HOST_PARAM_HWADDRESS:
677 case ISCSI_HOST_PARAM_INITIATOR_NAME:
684 case ISCSI_PARAM_MAX_RECV_DLENGTH:
685 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
686 case ISCSI_PARAM_HDRDGST_EN:
687 case ISCSI_PARAM_DATADGST_EN:
688 case ISCSI_PARAM_CONN_ADDRESS:
689 case ISCSI_PARAM_CONN_PORT:
690 case ISCSI_PARAM_EXP_STATSN:
691 case ISCSI_PARAM_PERSISTENT_ADDRESS:
692 case ISCSI_PARAM_PERSISTENT_PORT:
693 case ISCSI_PARAM_PING_TMO:
694 case ISCSI_PARAM_RECV_TMO:
695 case ISCSI_PARAM_INITIAL_R2T_EN:
696 case ISCSI_PARAM_MAX_R2T:
697 case ISCSI_PARAM_IMM_DATA_EN:
698 case ISCSI_PARAM_FIRST_BURST:
699 case ISCSI_PARAM_MAX_BURST:
700 case ISCSI_PARAM_PDU_INORDER_EN:
701 case ISCSI_PARAM_DATASEQ_INORDER_EN:
702 case ISCSI_PARAM_TARGET_NAME:
703 case ISCSI_PARAM_TPGT:
704 case ISCSI_PARAM_USERNAME:
705 case ISCSI_PARAM_PASSWORD:
706 case ISCSI_PARAM_USERNAME_IN:
707 case ISCSI_PARAM_PASSWORD_IN:
708 case ISCSI_PARAM_FAST_ABORT:
709 case ISCSI_PARAM_ABORT_TMO:
710 case ISCSI_PARAM_LU_RESET_TMO:
711 case ISCSI_PARAM_TGT_RESET_TMO:
712 case ISCSI_PARAM_IFACE_NAME:
713 case ISCSI_PARAM_INITIATOR_NAME:
714 case ISCSI_PARAM_DISCOVERY_SESS:
724 static struct scsi_host_template iscsi_iser_sht = {
725 .module = THIS_MODULE,
726 .name = "iSCSI Initiator over iSER",
727 .queuecommand = iscsi_queuecommand,
728 .change_queue_depth = iscsi_change_queue_depth,
729 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE,
731 .cmd_per_lun = ISER_DEF_CMD_PER_LUN,
732 .eh_abort_handler = iscsi_eh_abort,
733 .eh_device_reset_handler= iscsi_eh_device_reset,
734 .eh_target_reset_handler = iscsi_eh_recover_target,
735 .target_alloc = iscsi_target_alloc,
736 .use_clustering = DISABLE_CLUSTERING,
737 .proc_name = "iscsi_iser",
741 static struct iscsi_transport iscsi_iser_transport = {
742 .owner = THIS_MODULE,
744 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO,
745 /* session management */
746 .create_session = iscsi_iser_session_create,
747 .destroy_session = iscsi_iser_session_destroy,
748 /* connection management */
749 .create_conn = iscsi_iser_conn_create,
750 .bind_conn = iscsi_iser_conn_bind,
751 .destroy_conn = iscsi_iser_conn_destroy,
752 .attr_is_visible = iser_attr_is_visible,
753 .set_param = iscsi_iser_set_param,
754 .get_conn_param = iscsi_conn_get_param,
755 .get_ep_param = iscsi_iser_get_ep_param,
756 .get_session_param = iscsi_session_get_param,
757 .start_conn = iscsi_conn_start,
758 .stop_conn = iscsi_iser_conn_stop,
759 /* iscsi host params */
760 .get_host_param = iscsi_host_get_param,
761 .set_host_param = iscsi_host_set_param,
763 .send_pdu = iscsi_conn_send_pdu,
764 .get_stats = iscsi_iser_conn_get_stats,
765 .init_task = iscsi_iser_task_init,
766 .xmit_task = iscsi_iser_task_xmit,
767 .cleanup_task = iscsi_iser_cleanup_task,
768 .alloc_pdu = iscsi_iser_pdu_alloc,
769 .check_protection = iscsi_iser_check_protection,
771 .session_recovery_timedout = iscsi_session_recovery_timedout,
773 .ep_connect = iscsi_iser_ep_connect,
774 .ep_poll = iscsi_iser_ep_poll,
775 .ep_disconnect = iscsi_iser_ep_disconnect
778 static int __init iser_init(void)
782 iser_dbg("Starting iSER datamover...\n");
784 if (iscsi_max_lun < 1) {
785 iser_err("Invalid max_lun value of %u\n", iscsi_max_lun);
789 memset(&ig, 0, sizeof(struct iser_global));
791 ig.desc_cache = kmem_cache_create("iser_descriptors",
792 sizeof(struct iser_tx_desc),
793 0, SLAB_HWCACHE_ALIGN,
795 if (ig.desc_cache == NULL)
798 /* device init is called only after the first addr resolution */
799 mutex_init(&ig.device_list_mutex);
800 INIT_LIST_HEAD(&ig.device_list);
801 mutex_init(&ig.connlist_mutex);
802 INIT_LIST_HEAD(&ig.connlist);
804 iscsi_iser_scsi_transport = iscsi_register_transport(
805 &iscsi_iser_transport);
806 if (!iscsi_iser_scsi_transport) {
807 iser_err("iscsi_register_transport failed\n");
809 goto register_transport_failure;
814 register_transport_failure:
815 kmem_cache_destroy(ig.desc_cache);
820 static void __exit iser_exit(void)
822 iser_dbg("Removing iSER datamover...\n");
823 iscsi_unregister_transport(&iscsi_iser_transport);
824 kmem_cache_destroy(ig.desc_cache);
827 module_init(iser_init);
828 module_exit(iser_exit);