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
*ib_conn
= task
->conn
->dd_data
;
151 struct iser_device
*device
= 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
->ib_conn
= ib_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
*ib_conn
= task
->conn
->dd_data
;
294 struct iser_device
*device
= 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 iscsi_session
*session
;
348 struct iser_conn
*ib_conn
;
349 struct iscsi_endpoint
*ep
;
352 error
= iscsi_conn_bind(cls_session
, cls_conn
, is_leading
);
356 /* the transport ep handle comes from user space so it must be
357 * verified against the global ib connections list */
358 ep
= iscsi_lookup_endpoint(transport_eph
);
360 iser_err("can't bind eph %llx\n",
361 (unsigned long long)transport_eph
);
364 ib_conn
= ep
->dd_data
;
366 session
= conn
->session
;
367 if (iser_alloc_rx_descriptors(ib_conn
, session
))
370 /* binds the iSER connection retrieved from the previously
371 * connected ep_handle to the iSCSI layer connection. exchanges
372 * connection pointers */
373 iser_info("binding iscsi conn %p to ib_conn %p\n", conn
, ib_conn
);
375 conn
->dd_data
= ib_conn
;
376 ib_conn
->iscsi_conn
= conn
;
382 iscsi_iser_conn_start(struct iscsi_cls_conn
*cls_conn
)
384 struct iscsi_conn
*iscsi_conn
;
385 struct iser_conn
*ib_conn
;
387 iscsi_conn
= cls_conn
->dd_data
;
388 ib_conn
= iscsi_conn
->dd_data
;
389 reinit_completion(&ib_conn
->stop_completion
);
391 return iscsi_conn_start(cls_conn
);
395 iscsi_iser_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
397 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
398 struct iser_conn
*ib_conn
= conn
->dd_data
;
400 iser_dbg("stopping iscsi_conn: %p, ib_conn: %p\n", conn
, ib_conn
);
401 iscsi_conn_stop(cls_conn
, flag
);
404 * Userspace may have goofed up and not bound the connection or
405 * might have only partially setup the connection.
408 conn
->dd_data
= NULL
;
409 complete(&ib_conn
->stop_completion
);
413 static void iscsi_iser_session_destroy(struct iscsi_cls_session
*cls_session
)
415 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
417 iscsi_session_teardown(cls_session
);
418 iscsi_host_remove(shost
);
419 iscsi_host_free(shost
);
422 static inline unsigned int
423 iser_dif_prot_caps(int prot_caps
)
425 return ((prot_caps
& IB_PROT_T10DIF_TYPE_1
) ? SHOST_DIF_TYPE1_PROTECTION
|
426 SHOST_DIX_TYPE1_PROTECTION
: 0) |
427 ((prot_caps
& IB_PROT_T10DIF_TYPE_2
) ? SHOST_DIF_TYPE2_PROTECTION
|
428 SHOST_DIX_TYPE2_PROTECTION
: 0) |
429 ((prot_caps
& IB_PROT_T10DIF_TYPE_3
) ? SHOST_DIF_TYPE3_PROTECTION
|
430 SHOST_DIX_TYPE3_PROTECTION
: 0);
433 static struct iscsi_cls_session
*
434 iscsi_iser_session_create(struct iscsi_endpoint
*ep
,
435 uint16_t cmds_max
, uint16_t qdepth
,
436 uint32_t initial_cmdsn
)
438 struct iscsi_cls_session
*cls_session
;
439 struct iscsi_session
*session
;
440 struct Scsi_Host
*shost
;
441 struct iser_conn
*ib_conn
= NULL
;
443 shost
= iscsi_host_alloc(&iscsi_iser_sht
, 0, 0);
446 shost
->transportt
= iscsi_iser_scsi_transport
;
447 shost
->cmd_per_lun
= qdepth
;
448 shost
->max_lun
= iscsi_max_lun
;
450 shost
->max_channel
= 0;
451 shost
->max_cmd_len
= 16;
454 * older userspace tools (before 2.0-870) did not pass us
455 * the leading conn's ep so this will be NULL;
458 ib_conn
= ep
->dd_data
;
459 if (ib_conn
->pi_support
) {
460 u32 sig_caps
= ib_conn
->device
->dev_attr
.sig_prot_cap
;
462 scsi_host_set_prot(shost
, iser_dif_prot_caps(sig_caps
));
464 scsi_host_set_guard(shost
, SHOST_DIX_GUARD_IP
);
466 scsi_host_set_guard(shost
, SHOST_DIX_GUARD_CRC
);
470 if (iscsi_host_add(shost
,
471 ep
? ib_conn
->device
->ib_device
->dma_device
: NULL
))
474 if (cmds_max
> ISER_DEF_XMIT_CMDS_MAX
) {
475 iser_info("cmds_max changed from %u to %u\n",
476 cmds_max
, ISER_DEF_XMIT_CMDS_MAX
);
477 cmds_max
= ISER_DEF_XMIT_CMDS_MAX
;
480 cls_session
= iscsi_session_setup(&iscsi_iser_transport
, shost
,
482 sizeof(struct iscsi_iser_task
),
486 session
= cls_session
->dd_data
;
488 shost
->can_queue
= session
->scsi_cmds_max
;
492 iscsi_host_remove(shost
);
494 iscsi_host_free(shost
);
499 iscsi_iser_set_param(struct iscsi_cls_conn
*cls_conn
,
500 enum iscsi_param param
, char *buf
, int buflen
)
505 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
508 case ISCSI_PARAM_HDRDGST_EN
:
509 sscanf(buf
, "%d", &value
);
511 iser_err("DataDigest wasn't negotiated to None\n");
515 case ISCSI_PARAM_DATADGST_EN
:
516 sscanf(buf
, "%d", &value
);
518 iser_err("DataDigest wasn't negotiated to None\n");
522 case ISCSI_PARAM_IFMARKER_EN
:
523 sscanf(buf
, "%d", &value
);
525 iser_err("IFMarker wasn't negotiated to No\n");
529 case ISCSI_PARAM_OFMARKER_EN
:
530 sscanf(buf
, "%d", &value
);
532 iser_err("OFMarker wasn't negotiated to No\n");
537 return iscsi_set_param(cls_conn
, param
, buf
, buflen
);
544 iscsi_iser_conn_get_stats(struct iscsi_cls_conn
*cls_conn
, struct iscsi_stats
*stats
)
546 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
548 stats
->txdata_octets
= conn
->txdata_octets
;
549 stats
->rxdata_octets
= conn
->rxdata_octets
;
550 stats
->scsicmd_pdus
= conn
->scsicmd_pdus_cnt
;
551 stats
->dataout_pdus
= conn
->dataout_pdus_cnt
;
552 stats
->scsirsp_pdus
= conn
->scsirsp_pdus_cnt
;
553 stats
->datain_pdus
= conn
->datain_pdus_cnt
; /* always 0 */
554 stats
->r2t_pdus
= conn
->r2t_pdus_cnt
; /* always 0 */
555 stats
->tmfcmd_pdus
= conn
->tmfcmd_pdus_cnt
;
556 stats
->tmfrsp_pdus
= conn
->tmfrsp_pdus_cnt
;
557 stats
->custom_length
= 4;
558 strcpy(stats
->custom
[0].desc
, "qp_tx_queue_full");
559 stats
->custom
[0].value
= 0; /* TB iser_conn->qp_tx_queue_full; */
560 strcpy(stats
->custom
[1].desc
, "fmr_map_not_avail");
561 stats
->custom
[1].value
= 0; /* TB iser_conn->fmr_map_not_avail */;
562 strcpy(stats
->custom
[2].desc
, "eh_abort_cnt");
563 stats
->custom
[2].value
= conn
->eh_abort_cnt
;
564 strcpy(stats
->custom
[3].desc
, "fmr_unalign_cnt");
565 stats
->custom
[3].value
= conn
->fmr_unalign_cnt
;
568 static int iscsi_iser_get_ep_param(struct iscsi_endpoint
*ep
,
569 enum iscsi_param param
, char *buf
)
571 struct iser_conn
*ib_conn
= ep
->dd_data
;
575 case ISCSI_PARAM_CONN_PORT
:
576 case ISCSI_PARAM_CONN_ADDRESS
:
577 if (!ib_conn
|| !ib_conn
->cma_id
)
580 return iscsi_conn_get_addr_param((struct sockaddr_storage
*)
581 &ib_conn
->cma_id
->route
.addr
.dst_addr
,
591 static struct iscsi_endpoint
*
592 iscsi_iser_ep_connect(struct Scsi_Host
*shost
, struct sockaddr
*dst_addr
,
596 struct iser_conn
*ib_conn
;
597 struct iscsi_endpoint
*ep
;
599 ep
= iscsi_create_endpoint(sizeof(*ib_conn
));
601 return ERR_PTR(-ENOMEM
);
603 ib_conn
= ep
->dd_data
;
605 iser_conn_init(ib_conn
);
607 err
= iser_connect(ib_conn
, NULL
, (struct sockaddr_in
*)dst_addr
,
616 iscsi_iser_ep_poll(struct iscsi_endpoint
*ep
, int timeout_ms
)
618 struct iser_conn
*ib_conn
;
621 ib_conn
= ep
->dd_data
;
622 rc
= wait_event_interruptible_timeout(ib_conn
->wait
,
623 ib_conn
->state
== ISER_CONN_UP
,
624 msecs_to_jiffies(timeout_ms
));
626 /* if conn establishment failed, return error code to iscsi */
628 (ib_conn
->state
== ISER_CONN_TERMINATING
||
629 ib_conn
->state
== ISER_CONN_DOWN
))
632 iser_info("ib conn %p rc = %d\n", ib_conn
, rc
);
635 return 1; /* success, this is the equivalent of POLLOUT */
637 return 0; /* timeout */
639 return rc
; /* signal */
643 iscsi_iser_ep_disconnect(struct iscsi_endpoint
*ep
)
645 struct iser_conn
*ib_conn
;
647 ib_conn
= ep
->dd_data
;
648 iser_info("ep %p ib conn %p state %d\n", ep
, ib_conn
, ib_conn
->state
);
649 iser_conn_terminate(ib_conn
);
652 * if iser_conn and iscsi_conn are bound, we must wait iscsi_conn_stop
653 * call and ISER_CONN_DOWN state before freeing the iser resources.
654 * otherwise we are safe to free resources immediately.
656 if (ib_conn
->iscsi_conn
) {
657 INIT_WORK(&ib_conn
->release_work
, iser_release_work
);
658 queue_work(release_wq
, &ib_conn
->release_work
);
660 iser_conn_release(ib_conn
);
664 static umode_t
iser_attr_is_visible(int param_type
, int param
)
666 switch (param_type
) {
667 case ISCSI_HOST_PARAM
:
669 case ISCSI_HOST_PARAM_NETDEV_NAME
:
670 case ISCSI_HOST_PARAM_HWADDRESS
:
671 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
678 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
679 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
680 case ISCSI_PARAM_HDRDGST_EN
:
681 case ISCSI_PARAM_DATADGST_EN
:
682 case ISCSI_PARAM_CONN_ADDRESS
:
683 case ISCSI_PARAM_CONN_PORT
:
684 case ISCSI_PARAM_EXP_STATSN
:
685 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
686 case ISCSI_PARAM_PERSISTENT_PORT
:
687 case ISCSI_PARAM_PING_TMO
:
688 case ISCSI_PARAM_RECV_TMO
:
689 case ISCSI_PARAM_INITIAL_R2T_EN
:
690 case ISCSI_PARAM_MAX_R2T
:
691 case ISCSI_PARAM_IMM_DATA_EN
:
692 case ISCSI_PARAM_FIRST_BURST
:
693 case ISCSI_PARAM_MAX_BURST
:
694 case ISCSI_PARAM_PDU_INORDER_EN
:
695 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
696 case ISCSI_PARAM_TARGET_NAME
:
697 case ISCSI_PARAM_TPGT
:
698 case ISCSI_PARAM_USERNAME
:
699 case ISCSI_PARAM_PASSWORD
:
700 case ISCSI_PARAM_USERNAME_IN
:
701 case ISCSI_PARAM_PASSWORD_IN
:
702 case ISCSI_PARAM_FAST_ABORT
:
703 case ISCSI_PARAM_ABORT_TMO
:
704 case ISCSI_PARAM_LU_RESET_TMO
:
705 case ISCSI_PARAM_TGT_RESET_TMO
:
706 case ISCSI_PARAM_IFACE_NAME
:
707 case ISCSI_PARAM_INITIATOR_NAME
:
708 case ISCSI_PARAM_DISCOVERY_SESS
:
718 static struct scsi_host_template iscsi_iser_sht
= {
719 .module
= THIS_MODULE
,
720 .name
= "iSCSI Initiator over iSER",
721 .queuecommand
= iscsi_queuecommand
,
722 .change_queue_depth
= iscsi_change_queue_depth
,
723 .sg_tablesize
= ISCSI_ISER_SG_TABLESIZE
,
725 .cmd_per_lun
= ISER_DEF_CMD_PER_LUN
,
726 .eh_abort_handler
= iscsi_eh_abort
,
727 .eh_device_reset_handler
= iscsi_eh_device_reset
,
728 .eh_target_reset_handler
= iscsi_eh_recover_target
,
729 .target_alloc
= iscsi_target_alloc
,
730 .use_clustering
= DISABLE_CLUSTERING
,
731 .proc_name
= "iscsi_iser",
735 static struct iscsi_transport iscsi_iser_transport
= {
736 .owner
= THIS_MODULE
,
738 .caps
= CAP_RECOVERY_L0
| CAP_MULTI_R2T
| CAP_TEXT_NEGO
,
739 /* session management */
740 .create_session
= iscsi_iser_session_create
,
741 .destroy_session
= iscsi_iser_session_destroy
,
742 /* connection management */
743 .create_conn
= iscsi_iser_conn_create
,
744 .bind_conn
= iscsi_iser_conn_bind
,
745 .destroy_conn
= iscsi_conn_teardown
,
746 .attr_is_visible
= iser_attr_is_visible
,
747 .set_param
= iscsi_iser_set_param
,
748 .get_conn_param
= iscsi_conn_get_param
,
749 .get_ep_param
= iscsi_iser_get_ep_param
,
750 .get_session_param
= iscsi_session_get_param
,
751 .start_conn
= iscsi_iser_conn_start
,
752 .stop_conn
= iscsi_iser_conn_stop
,
753 /* iscsi host params */
754 .get_host_param
= iscsi_host_get_param
,
755 .set_host_param
= iscsi_host_set_param
,
757 .send_pdu
= iscsi_conn_send_pdu
,
758 .get_stats
= iscsi_iser_conn_get_stats
,
759 .init_task
= iscsi_iser_task_init
,
760 .xmit_task
= iscsi_iser_task_xmit
,
761 .cleanup_task
= iscsi_iser_cleanup_task
,
762 .alloc_pdu
= iscsi_iser_pdu_alloc
,
763 .check_protection
= iscsi_iser_check_protection
,
765 .session_recovery_timedout
= iscsi_session_recovery_timedout
,
767 .ep_connect
= iscsi_iser_ep_connect
,
768 .ep_poll
= iscsi_iser_ep_poll
,
769 .ep_disconnect
= iscsi_iser_ep_disconnect
772 static int __init
iser_init(void)
776 iser_dbg("Starting iSER datamover...\n");
778 if (iscsi_max_lun
< 1) {
779 iser_err("Invalid max_lun value of %u\n", iscsi_max_lun
);
783 memset(&ig
, 0, sizeof(struct iser_global
));
785 ig
.desc_cache
= kmem_cache_create("iser_descriptors",
786 sizeof(struct iser_tx_desc
),
787 0, SLAB_HWCACHE_ALIGN
,
789 if (ig
.desc_cache
== NULL
)
792 /* device init is called only after the first addr resolution */
793 mutex_init(&ig
.device_list_mutex
);
794 INIT_LIST_HEAD(&ig
.device_list
);
795 mutex_init(&ig
.connlist_mutex
);
796 INIT_LIST_HEAD(&ig
.connlist
);
798 release_wq
= alloc_workqueue("release workqueue", 0, 0);
800 iser_err("failed to allocate release workqueue\n");
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 struct iser_conn
*ib_conn
, *n
;
825 iser_dbg("Removing iSER datamover...\n");
826 destroy_workqueue(release_wq
);
828 mutex_lock(&ig
.connlist_mutex
);
829 connlist_empty
= list_empty(&ig
.connlist
);
830 mutex_unlock(&ig
.connlist_mutex
);
832 if (!connlist_empty
) {
833 iser_err("Error cleanup stage completed but we still have iser "
834 "connections, destroying them anyway.\n");
835 list_for_each_entry_safe(ib_conn
, n
, &ig
.connlist
, conn_list
) {
836 iser_conn_release(ib_conn
);
840 iscsi_unregister_transport(&iscsi_iser_transport
);
841 kmem_cache_destroy(ig
.desc_cache
);
844 module_init(iser_init
);
845 module_exit(iser_exit
);