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 static struct workqueue_struct *release_wq;
103 struct iser_global ig;
106 iscsi_iser_recv(struct iscsi_conn *conn,
107 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
113 /* verify PDU length */
114 datalen = ntoh24(hdr->dlength);
115 if (datalen > rx_data_len || (datalen + 4) < rx_data_len) {
116 iser_err("wrong datalen %d (hdr), %d (IB)\n",
117 datalen, rx_data_len);
118 rc = ISCSI_ERR_DATALEN;
122 if (datalen != rx_data_len)
123 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",
124 datalen, rx_data_len);
127 ahslen = hdr->hlength * 4;
129 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
130 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
135 iscsi_conn_failure(conn, rc);
138 static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
140 struct iscsi_iser_task *iser_task = task->dd_data;
142 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
143 task->hdr_max = sizeof(iser_task->desc.iscsi_header);
147 int iser_initialize_task_headers(struct iscsi_task *task,
148 struct iser_tx_desc *tx_desc)
150 struct iser_conn *iser_conn = task->conn->dd_data;
151 struct iser_device *device = iser_conn->ib_conn.device;
152 struct iscsi_iser_task *iser_task = task->dd_data;
155 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
156 ISER_HEADERS_LEN, DMA_TO_DEVICE);
157 if (ib_dma_mapping_error(device->ib_device, dma_addr))
160 tx_desc->dma_addr = dma_addr;
161 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
162 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
163 tx_desc->tx_sg[0].lkey = device->mr->lkey;
165 iser_task->iser_conn = iser_conn;
169 * iscsi_iser_task_init - Initialize task
172 * Initialize the task for the scsi command or mgmt command.
175 iscsi_iser_task_init(struct iscsi_task *task)
177 struct iscsi_iser_task *iser_task = task->dd_data;
179 if (iser_initialize_task_headers(task, &iser_task->desc))
186 iser_task->command_sent = 0;
187 iser_task_rdma_init(iser_task);
188 iser_task->sc = task->sc;
194 * iscsi_iser_mtask_xmit - xmit management(immediate) task
195 * @conn: iscsi connection
196 * @task: task management task
199 * The function can return -EAGAIN in which case caller must
200 * call it again later, or recover. '0' return code means successful
205 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
209 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
211 error = iser_send_control(conn, task);
213 /* since iser xmits control with zero copy, tasks can not be recycled
214 * right after sending them.
215 * The recycling scheme is based on whether a response is expected
216 * - if yes, the task is recycled at iscsi_complete_pdu
217 * - if no, the task is recycled at iser_snd_completion
223 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
224 struct iscsi_task *task)
226 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
227 struct iscsi_data hdr;
230 /* Send data-out PDUs while there's still unsolicited data to send */
231 while (iscsi_task_has_unsol_data(task)) {
232 iscsi_prep_data_out_pdu(task, r2t, &hdr);
233 iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
234 hdr.itt, r2t->data_count);
236 /* the buffer description has been passed with the command */
237 /* Send the command */
238 error = iser_send_data_out(conn, task, &hdr);
241 goto iscsi_iser_task_xmit_unsol_data_exit;
243 r2t->sent += r2t->data_count;
244 iser_dbg("Need to send %d more as data-out PDUs\n",
245 r2t->data_length - r2t->sent);
248 iscsi_iser_task_xmit_unsol_data_exit:
253 iscsi_iser_task_xmit(struct iscsi_task *task)
255 struct iscsi_conn *conn = task->conn;
256 struct iscsi_iser_task *iser_task = task->dd_data;
260 return iscsi_iser_mtask_xmit(conn, task);
262 if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
263 BUG_ON(scsi_bufflen(task->sc) == 0);
265 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
266 task->itt, scsi_bufflen(task->sc),
267 task->imm_count, task->unsol_r2t.data_length);
270 iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
271 conn->id, task->itt);
273 /* Send the cmd PDU */
274 if (!iser_task->command_sent) {
275 error = iser_send_command(conn, task);
277 goto iscsi_iser_task_xmit_exit;
278 iser_task->command_sent = 1;
281 /* Send unsolicited data-out PDU(s) if necessary */
282 if (iscsi_task_has_unsol_data(task))
283 error = iscsi_iser_task_xmit_unsol_data(conn, task);
285 iscsi_iser_task_xmit_exit:
289 static void iscsi_iser_cleanup_task(struct iscsi_task *task)
291 struct iscsi_iser_task *iser_task = task->dd_data;
292 struct iser_tx_desc *tx_desc = &iser_task->desc;
293 struct iser_conn *iser_conn = task->conn->dd_data;
294 struct iser_device *device = iser_conn->ib_conn.device;
296 ib_dma_unmap_single(device->ib_device,
297 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
299 /* mgmt tasks do not need special cleanup */
303 if (iser_task->status == ISER_TASK_STATUS_STARTED) {
304 iser_task->status = ISER_TASK_STATUS_COMPLETED;
305 iser_task_rdma_finalize(iser_task);
309 static u8 iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector)
311 struct iscsi_iser_task *iser_task = task->dd_data;
313 if (iser_task->dir[ISER_DIR_IN])
314 return iser_check_task_pi_status(iser_task, ISER_DIR_IN,
317 return iser_check_task_pi_status(iser_task, ISER_DIR_OUT,
321 static struct iscsi_cls_conn *
322 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
324 struct iscsi_conn *conn;
325 struct iscsi_cls_conn *cls_conn;
327 cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx);
330 conn = cls_conn->dd_data;
333 * due to issues with the login code re iser sematics
334 * this not set in iscsi_conn_setup - FIXME
336 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
342 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
343 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
346 struct iscsi_conn *conn = cls_conn->dd_data;
347 struct iser_conn *iser_conn;
348 struct iscsi_endpoint *ep;
351 error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
355 /* the transport ep handle comes from user space so it must be
356 * verified against the global ib connections list */
357 ep = iscsi_lookup_endpoint(transport_eph);
359 iser_err("can't bind eph %llx\n",
360 (unsigned long long)transport_eph);
363 iser_conn = ep->dd_data;
365 mutex_lock(&iser_conn->state_mutex);
366 if (iser_conn->state != ISER_CONN_UP) {
368 iser_err("iser_conn %p state is %d, teardown started\n",
369 iser_conn, iser_conn->state);
373 error = iser_alloc_rx_descriptors(iser_conn, conn->session);
377 /* binds the iSER connection retrieved from the previously
378 * connected ep_handle to the iSCSI layer connection. exchanges
379 * connection pointers */
380 iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn);
382 conn->dd_data = iser_conn;
383 iser_conn->iscsi_conn = conn;
386 mutex_unlock(&iser_conn->state_mutex);
391 iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
393 struct iscsi_conn *iscsi_conn;
394 struct iser_conn *iser_conn;
396 iscsi_conn = cls_conn->dd_data;
397 iser_conn = iscsi_conn->dd_data;
398 reinit_completion(&iser_conn->stop_completion);
400 return iscsi_conn_start(cls_conn);
404 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
406 struct iscsi_conn *conn = cls_conn->dd_data;
407 struct iser_conn *iser_conn = conn->dd_data;
409 iser_dbg("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn);
410 iscsi_conn_stop(cls_conn, flag);
413 * Userspace may have goofed up and not bound the connection or
414 * might have only partially setup the connection.
417 conn->dd_data = NULL;
418 complete(&iser_conn->stop_completion);
422 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
424 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
426 iscsi_session_teardown(cls_session);
427 iscsi_host_remove(shost);
428 iscsi_host_free(shost);
431 static inline unsigned int
432 iser_dif_prot_caps(int prot_caps)
434 return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? SHOST_DIF_TYPE1_PROTECTION |
435 SHOST_DIX_TYPE1_PROTECTION : 0) |
436 ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? SHOST_DIF_TYPE2_PROTECTION |
437 SHOST_DIX_TYPE2_PROTECTION : 0) |
438 ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? SHOST_DIF_TYPE3_PROTECTION |
439 SHOST_DIX_TYPE3_PROTECTION : 0);
442 static struct iscsi_cls_session *
443 iscsi_iser_session_create(struct iscsi_endpoint *ep,
444 uint16_t cmds_max, uint16_t qdepth,
445 uint32_t initial_cmdsn)
447 struct iscsi_cls_session *cls_session;
448 struct iscsi_session *session;
449 struct Scsi_Host *shost;
450 struct iser_conn *iser_conn = NULL;
451 struct ib_conn *ib_conn;
453 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
456 shost->transportt = iscsi_iser_scsi_transport;
457 shost->cmd_per_lun = qdepth;
458 shost->max_lun = iscsi_max_lun;
460 shost->max_channel = 0;
461 shost->max_cmd_len = 16;
464 * older userspace tools (before 2.0-870) did not pass us
465 * the leading conn's ep so this will be NULL;
468 iser_conn = ep->dd_data;
469 ib_conn = &iser_conn->ib_conn;
470 if (ib_conn->pi_support) {
471 u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap;
473 scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps));
475 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
477 scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC);
481 if (iscsi_host_add(shost, ep ?
482 ib_conn->device->ib_device->dma_device : NULL))
485 if (cmds_max > ISER_DEF_XMIT_CMDS_MAX) {
486 iser_info("cmds_max changed from %u to %u\n",
487 cmds_max, ISER_DEF_XMIT_CMDS_MAX);
488 cmds_max = ISER_DEF_XMIT_CMDS_MAX;
491 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
493 sizeof(struct iscsi_iser_task),
497 session = cls_session->dd_data;
499 shost->can_queue = session->scsi_cmds_max;
503 iscsi_host_remove(shost);
505 iscsi_host_free(shost);
510 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
511 enum iscsi_param param, char *buf, int buflen)
516 case ISCSI_PARAM_MAX_RECV_DLENGTH:
519 case ISCSI_PARAM_HDRDGST_EN:
520 sscanf(buf, "%d", &value);
522 iser_err("DataDigest wasn't negotiated to None\n");
526 case ISCSI_PARAM_DATADGST_EN:
527 sscanf(buf, "%d", &value);
529 iser_err("DataDigest wasn't negotiated to None\n");
533 case ISCSI_PARAM_IFMARKER_EN:
534 sscanf(buf, "%d", &value);
536 iser_err("IFMarker wasn't negotiated to No\n");
540 case ISCSI_PARAM_OFMARKER_EN:
541 sscanf(buf, "%d", &value);
543 iser_err("OFMarker wasn't negotiated to No\n");
548 return iscsi_set_param(cls_conn, param, buf, buflen);
555 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
557 struct iscsi_conn *conn = cls_conn->dd_data;
559 stats->txdata_octets = conn->txdata_octets;
560 stats->rxdata_octets = conn->rxdata_octets;
561 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
562 stats->dataout_pdus = conn->dataout_pdus_cnt;
563 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
564 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
565 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
566 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
567 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
568 stats->custom_length = 4;
569 strcpy(stats->custom[0].desc, "qp_tx_queue_full");
570 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
571 strcpy(stats->custom[1].desc, "fmr_map_not_avail");
572 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
573 strcpy(stats->custom[2].desc, "eh_abort_cnt");
574 stats->custom[2].value = conn->eh_abort_cnt;
575 strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
576 stats->custom[3].value = conn->fmr_unalign_cnt;
579 static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
580 enum iscsi_param param, char *buf)
582 struct iser_conn *iser_conn = ep->dd_data;
586 case ISCSI_PARAM_CONN_PORT:
587 case ISCSI_PARAM_CONN_ADDRESS:
588 if (!iser_conn || !iser_conn->ib_conn.cma_id)
591 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
592 &iser_conn->ib_conn.cma_id->route.addr.dst_addr,
602 static struct iscsi_endpoint *
603 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
607 struct iser_conn *iser_conn;
608 struct iscsi_endpoint *ep;
610 ep = iscsi_create_endpoint(0);
612 return ERR_PTR(-ENOMEM);
614 iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL);
620 ep->dd_data = iser_conn;
622 iser_conn_init(iser_conn);
624 err = iser_connect(iser_conn, NULL, dst_addr, non_blocking);
630 iscsi_destroy_endpoint(ep);
635 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
637 struct iser_conn *iser_conn;
640 iser_conn = ep->dd_data;
641 rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion,
642 msecs_to_jiffies(timeout_ms));
643 /* if conn establishment failed, return error code to iscsi */
645 mutex_lock(&iser_conn->state_mutex);
646 if (iser_conn->state == ISER_CONN_TERMINATING ||
647 iser_conn->state == ISER_CONN_DOWN)
649 mutex_unlock(&iser_conn->state_mutex);
652 iser_info("ib conn %p rc = %d\n", iser_conn, rc);
655 return 1; /* success, this is the equivalent of POLLOUT */
657 return 0; /* timeout */
659 return rc; /* signal */
663 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
665 struct iser_conn *iser_conn;
667 iser_conn = ep->dd_data;
668 iser_info("ep %p iser conn %p state %d\n",
669 ep, iser_conn, iser_conn->state);
671 mutex_lock(&iser_conn->state_mutex);
672 iser_conn_terminate(iser_conn);
675 * if iser_conn and iscsi_conn are bound, we must wait for
676 * iscsi_conn_stop and flush errors completion before freeing
677 * the iser resources. Otherwise we are safe to free resources
680 if (iser_conn->iscsi_conn) {
681 INIT_WORK(&iser_conn->release_work, iser_release_work);
682 queue_work(release_wq, &iser_conn->release_work);
683 mutex_unlock(&iser_conn->state_mutex);
685 iser_conn->state = ISER_CONN_DOWN;
686 mutex_unlock(&iser_conn->state_mutex);
687 iser_conn_release(iser_conn);
689 iscsi_destroy_endpoint(ep);
692 static umode_t iser_attr_is_visible(int param_type, int param)
694 switch (param_type) {
695 case ISCSI_HOST_PARAM:
697 case ISCSI_HOST_PARAM_NETDEV_NAME:
698 case ISCSI_HOST_PARAM_HWADDRESS:
699 case ISCSI_HOST_PARAM_INITIATOR_NAME:
706 case ISCSI_PARAM_MAX_RECV_DLENGTH:
707 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
708 case ISCSI_PARAM_HDRDGST_EN:
709 case ISCSI_PARAM_DATADGST_EN:
710 case ISCSI_PARAM_CONN_ADDRESS:
711 case ISCSI_PARAM_CONN_PORT:
712 case ISCSI_PARAM_EXP_STATSN:
713 case ISCSI_PARAM_PERSISTENT_ADDRESS:
714 case ISCSI_PARAM_PERSISTENT_PORT:
715 case ISCSI_PARAM_PING_TMO:
716 case ISCSI_PARAM_RECV_TMO:
717 case ISCSI_PARAM_INITIAL_R2T_EN:
718 case ISCSI_PARAM_MAX_R2T:
719 case ISCSI_PARAM_IMM_DATA_EN:
720 case ISCSI_PARAM_FIRST_BURST:
721 case ISCSI_PARAM_MAX_BURST:
722 case ISCSI_PARAM_PDU_INORDER_EN:
723 case ISCSI_PARAM_DATASEQ_INORDER_EN:
724 case ISCSI_PARAM_TARGET_NAME:
725 case ISCSI_PARAM_TPGT:
726 case ISCSI_PARAM_USERNAME:
727 case ISCSI_PARAM_PASSWORD:
728 case ISCSI_PARAM_USERNAME_IN:
729 case ISCSI_PARAM_PASSWORD_IN:
730 case ISCSI_PARAM_FAST_ABORT:
731 case ISCSI_PARAM_ABORT_TMO:
732 case ISCSI_PARAM_LU_RESET_TMO:
733 case ISCSI_PARAM_TGT_RESET_TMO:
734 case ISCSI_PARAM_IFACE_NAME:
735 case ISCSI_PARAM_INITIATOR_NAME:
736 case ISCSI_PARAM_DISCOVERY_SESS:
746 static struct scsi_host_template iscsi_iser_sht = {
747 .module = THIS_MODULE,
748 .name = "iSCSI Initiator over iSER",
749 .queuecommand = iscsi_queuecommand,
750 .change_queue_depth = iscsi_change_queue_depth,
751 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE,
753 .cmd_per_lun = ISER_DEF_CMD_PER_LUN,
754 .eh_abort_handler = iscsi_eh_abort,
755 .eh_device_reset_handler= iscsi_eh_device_reset,
756 .eh_target_reset_handler = iscsi_eh_recover_target,
757 .target_alloc = iscsi_target_alloc,
758 .use_clustering = DISABLE_CLUSTERING,
759 .proc_name = "iscsi_iser",
763 static struct iscsi_transport iscsi_iser_transport = {
764 .owner = THIS_MODULE,
766 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO,
767 /* session management */
768 .create_session = iscsi_iser_session_create,
769 .destroy_session = iscsi_iser_session_destroy,
770 /* connection management */
771 .create_conn = iscsi_iser_conn_create,
772 .bind_conn = iscsi_iser_conn_bind,
773 .destroy_conn = iscsi_conn_teardown,
774 .attr_is_visible = iser_attr_is_visible,
775 .set_param = iscsi_iser_set_param,
776 .get_conn_param = iscsi_conn_get_param,
777 .get_ep_param = iscsi_iser_get_ep_param,
778 .get_session_param = iscsi_session_get_param,
779 .start_conn = iscsi_iser_conn_start,
780 .stop_conn = iscsi_iser_conn_stop,
781 /* iscsi host params */
782 .get_host_param = iscsi_host_get_param,
783 .set_host_param = iscsi_host_set_param,
785 .send_pdu = iscsi_conn_send_pdu,
786 .get_stats = iscsi_iser_conn_get_stats,
787 .init_task = iscsi_iser_task_init,
788 .xmit_task = iscsi_iser_task_xmit,
789 .cleanup_task = iscsi_iser_cleanup_task,
790 .alloc_pdu = iscsi_iser_pdu_alloc,
791 .check_protection = iscsi_iser_check_protection,
793 .session_recovery_timedout = iscsi_session_recovery_timedout,
795 .ep_connect = iscsi_iser_ep_connect,
796 .ep_poll = iscsi_iser_ep_poll,
797 .ep_disconnect = iscsi_iser_ep_disconnect
800 static int __init iser_init(void)
804 iser_dbg("Starting iSER datamover...\n");
806 if (iscsi_max_lun < 1) {
807 iser_err("Invalid max_lun value of %u\n", iscsi_max_lun);
811 memset(&ig, 0, sizeof(struct iser_global));
813 ig.desc_cache = kmem_cache_create("iser_descriptors",
814 sizeof(struct iser_tx_desc),
815 0, SLAB_HWCACHE_ALIGN,
817 if (ig.desc_cache == NULL)
820 /* device init is called only after the first addr resolution */
821 mutex_init(&ig.device_list_mutex);
822 INIT_LIST_HEAD(&ig.device_list);
823 mutex_init(&ig.connlist_mutex);
824 INIT_LIST_HEAD(&ig.connlist);
826 release_wq = alloc_workqueue("release workqueue", 0, 0);
828 iser_err("failed to allocate release workqueue\n");
832 iscsi_iser_scsi_transport = iscsi_register_transport(
833 &iscsi_iser_transport);
834 if (!iscsi_iser_scsi_transport) {
835 iser_err("iscsi_register_transport failed\n");
837 goto register_transport_failure;
842 register_transport_failure:
843 kmem_cache_destroy(ig.desc_cache);
848 static void __exit iser_exit(void)
850 struct iser_conn *iser_conn, *n;
853 iser_dbg("Removing iSER datamover...\n");
854 destroy_workqueue(release_wq);
856 mutex_lock(&ig.connlist_mutex);
857 connlist_empty = list_empty(&ig.connlist);
858 mutex_unlock(&ig.connlist_mutex);
860 if (!connlist_empty) {
861 iser_err("Error cleanup stage completed but we still have iser "
862 "connections, destroying them anyway.\n");
863 list_for_each_entry_safe(iser_conn, n, &ig.connlist,
865 iser_conn_release(iser_conn);
869 iscsi_unregister_transport(&iscsi_iser_transport);
870 kmem_cache_destroy(ig.desc_cache);
873 module_init(iser_init);
874 module_exit(iser_exit);