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 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover");
78 MODULE_LICENSE("Dual BSD/GPL");
79 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
80 MODULE_VERSION(DRV_VER
);
82 static struct scsi_host_template iscsi_iser_sht
;
83 static struct iscsi_transport iscsi_iser_transport
;
84 static struct scsi_transport_template
*iscsi_iser_scsi_transport
;
85 static struct workqueue_struct
*release_wq
;
86 struct iser_global ig
;
88 int iser_debug_level
= 0;
89 module_param_named(debug_level
, iser_debug_level
, int, S_IRUGO
| S_IWUSR
);
90 MODULE_PARM_DESC(debug_level
, "Enable debug tracing if > 0 (default:disabled)");
92 static unsigned int iscsi_max_lun
= 512;
93 module_param_named(max_lun
, iscsi_max_lun
, uint
, S_IRUGO
);
94 MODULE_PARM_DESC(max_lun
, "Max LUNs to allow per session (default:512");
96 unsigned int iser_max_sectors
= ISER_DEF_MAX_SECTORS
;
97 module_param_named(max_sectors
, iser_max_sectors
, uint
, S_IRUGO
| S_IWUSR
);
98 MODULE_PARM_DESC(max_sectors
, "Max number of sectors in a single scsi command (default:1024");
100 bool iser_pi_enable
= false;
101 module_param_named(pi_enable
, iser_pi_enable
, bool, S_IRUGO
);
102 MODULE_PARM_DESC(pi_enable
, "Enable T10-PI offload support (default:disabled)");
105 module_param_named(pi_guard
, iser_pi_guard
, int, S_IRUGO
);
106 MODULE_PARM_DESC(pi_guard
, "T10-PI guard_type [deprecated]");
109 * iscsi_iser_recv() - Process a successfull recv completion
110 * @conn: iscsi connection
112 * @rx_data: buffer containing receive data payload
113 * @rx_data_len: length of rx_data
115 * Notes: In case of data length errors or iscsi PDU completion failures
116 * this routine will signal iscsi layer of connection failure.
119 iscsi_iser_recv(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
120 char *rx_data
, int rx_data_len
)
126 /* verify PDU length */
127 datalen
= ntoh24(hdr
->dlength
);
128 if (datalen
> rx_data_len
|| (datalen
+ 4) < rx_data_len
) {
129 iser_err("wrong datalen %d (hdr), %d (IB)\n",
130 datalen
, rx_data_len
);
131 rc
= ISCSI_ERR_DATALEN
;
135 if (datalen
!= rx_data_len
)
136 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",
137 datalen
, rx_data_len
);
140 ahslen
= hdr
->hlength
* 4;
142 rc
= iscsi_complete_pdu(conn
, hdr
, rx_data
, rx_data_len
);
143 if (rc
&& rc
!= ISCSI_ERR_NO_SCSI_CMD
)
148 iscsi_conn_failure(conn
, rc
);
152 * iscsi_iser_pdu_alloc() - allocate an iscsi-iser PDU
154 * @opcode: iscsi command opcode
156 * Netes: This routine can't fail, just assign iscsi task
157 * hdr and max hdr size.
160 iscsi_iser_pdu_alloc(struct iscsi_task
*task
, uint8_t opcode
)
162 struct iscsi_iser_task
*iser_task
= task
->dd_data
;
164 task
->hdr
= (struct iscsi_hdr
*)&iser_task
->desc
.iscsi_header
;
165 task
->hdr_max
= sizeof(iser_task
->desc
.iscsi_header
);
171 * iser_initialize_task_headers() - Initialize task headers
173 * @tx_desc: iser tx descriptor
176 * This routine may race with iser teardown flow for scsi
177 * error handling TMFs. So for TMF we should acquire the
178 * state mutex to avoid dereferencing the IB device which
179 * may have already been terminated.
182 iser_initialize_task_headers(struct iscsi_task
*task
,
183 struct iser_tx_desc
*tx_desc
)
185 struct iser_conn
*iser_conn
= task
->conn
->dd_data
;
186 struct iser_device
*device
= iser_conn
->ib_conn
.device
;
187 struct iscsi_iser_task
*iser_task
= task
->dd_data
;
189 const bool mgmt_task
= !task
->sc
&& !in_interrupt();
192 if (unlikely(mgmt_task
))
193 mutex_lock(&iser_conn
->state_mutex
);
195 if (unlikely(iser_conn
->state
!= ISER_CONN_UP
)) {
200 dma_addr
= ib_dma_map_single(device
->ib_device
, (void *)tx_desc
,
201 ISER_HEADERS_LEN
, DMA_TO_DEVICE
);
202 if (ib_dma_mapping_error(device
->ib_device
, dma_addr
)) {
208 tx_desc
->mapped
= true;
209 tx_desc
->dma_addr
= dma_addr
;
210 tx_desc
->tx_sg
[0].addr
= tx_desc
->dma_addr
;
211 tx_desc
->tx_sg
[0].length
= ISER_HEADERS_LEN
;
212 tx_desc
->tx_sg
[0].lkey
= device
->pd
->local_dma_lkey
;
214 iser_task
->iser_conn
= iser_conn
;
216 if (unlikely(mgmt_task
))
217 mutex_unlock(&iser_conn
->state_mutex
);
223 * iscsi_iser_task_init() - Initialize iscsi-iser task
226 * Initialize the task for the scsi command or mgmt command.
228 * Return: Returns zero on success or -ENOMEM when failing
229 * to init task headers (dma mapping error).
232 iscsi_iser_task_init(struct iscsi_task
*task
)
234 struct iscsi_iser_task
*iser_task
= task
->dd_data
;
237 ret
= iser_initialize_task_headers(task
, &iser_task
->desc
);
239 iser_err("Failed to init task %p, err = %d\n",
248 iser_task
->command_sent
= 0;
249 iser_task_rdma_init(iser_task
);
250 iser_task
->sc
= task
->sc
;
256 * iscsi_iser_mtask_xmit() - xmit management (immediate) task
257 * @conn: iscsi connection
258 * @task: task management task
261 * The function can return -EAGAIN in which case caller must
262 * call it again later, or recover. '0' return code means successful
267 iscsi_iser_mtask_xmit(struct iscsi_conn
*conn
, struct iscsi_task
*task
)
271 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn
->id
, task
->itt
);
273 error
= iser_send_control(conn
, task
);
275 /* since iser xmits control with zero copy, tasks can not be recycled
276 * right after sending them.
277 * The recycling scheme is based on whether a response is expected
278 * - if yes, the task is recycled at iscsi_complete_pdu
279 * - if no, the task is recycled at iser_snd_completion
285 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn
*conn
,
286 struct iscsi_task
*task
)
288 struct iscsi_r2t_info
*r2t
= &task
->unsol_r2t
;
289 struct iscsi_data hdr
;
292 /* Send data-out PDUs while there's still unsolicited data to send */
293 while (iscsi_task_has_unsol_data(task
)) {
294 iscsi_prep_data_out_pdu(task
, r2t
, &hdr
);
295 iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
296 hdr
.itt
, r2t
->data_count
);
298 /* the buffer description has been passed with the command */
299 /* Send the command */
300 error
= iser_send_data_out(conn
, task
, &hdr
);
303 goto iscsi_iser_task_xmit_unsol_data_exit
;
305 r2t
->sent
+= r2t
->data_count
;
306 iser_dbg("Need to send %d more as data-out PDUs\n",
307 r2t
->data_length
- r2t
->sent
);
310 iscsi_iser_task_xmit_unsol_data_exit
:
315 * iscsi_iser_task_xmit() - xmit iscsi-iser task
318 * Return: zero on success or escalates $error on failure.
321 iscsi_iser_task_xmit(struct iscsi_task
*task
)
323 struct iscsi_conn
*conn
= task
->conn
;
324 struct iscsi_iser_task
*iser_task
= task
->dd_data
;
328 return iscsi_iser_mtask_xmit(conn
, task
);
330 if (task
->sc
->sc_data_direction
== DMA_TO_DEVICE
) {
331 BUG_ON(scsi_bufflen(task
->sc
) == 0);
333 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
334 task
->itt
, scsi_bufflen(task
->sc
),
335 task
->imm_count
, task
->unsol_r2t
.data_length
);
338 iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
339 conn
->id
, task
->itt
);
341 /* Send the cmd PDU */
342 if (!iser_task
->command_sent
) {
343 error
= iser_send_command(conn
, task
);
345 goto iscsi_iser_task_xmit_exit
;
346 iser_task
->command_sent
= 1;
349 /* Send unsolicited data-out PDU(s) if necessary */
350 if (iscsi_task_has_unsol_data(task
))
351 error
= iscsi_iser_task_xmit_unsol_data(conn
, task
);
353 iscsi_iser_task_xmit_exit
:
358 * iscsi_iser_cleanup_task() - cleanup an iscsi-iser task
361 * Notes: In case the RDMA device is already NULL (might have
362 * been removed in DEVICE_REMOVAL CM event it will bail-out
363 * without doing dma unmapping.
365 static void iscsi_iser_cleanup_task(struct iscsi_task
*task
)
367 struct iscsi_iser_task
*iser_task
= task
->dd_data
;
368 struct iser_tx_desc
*tx_desc
= &iser_task
->desc
;
369 struct iser_conn
*iser_conn
= task
->conn
->dd_data
;
370 struct iser_device
*device
= iser_conn
->ib_conn
.device
;
372 /* DEVICE_REMOVAL event might have already released the device */
376 if (likely(tx_desc
->mapped
)) {
377 ib_dma_unmap_single(device
->ib_device
, tx_desc
->dma_addr
,
378 ISER_HEADERS_LEN
, DMA_TO_DEVICE
);
379 tx_desc
->mapped
= false;
382 /* mgmt tasks do not need special cleanup */
386 if (iser_task
->status
== ISER_TASK_STATUS_STARTED
) {
387 iser_task
->status
= ISER_TASK_STATUS_COMPLETED
;
388 iser_task_rdma_finalize(iser_task
);
393 * iscsi_iser_check_protection() - check protection information status of task.
395 * @sector: error sector if exsists (output)
397 * Return: zero if no data-integrity errors have occured
398 * 0x1: data-integrity error occured in the guard-block
399 * 0x2: data-integrity error occured in the reference tag
400 * 0x3: data-integrity error occured in the application tag
402 * In addition the error sector is marked.
405 iscsi_iser_check_protection(struct iscsi_task
*task
, sector_t
*sector
)
407 struct iscsi_iser_task
*iser_task
= task
->dd_data
;
409 if (iser_task
->dir
[ISER_DIR_IN
])
410 return iser_check_task_pi_status(iser_task
, ISER_DIR_IN
,
413 return iser_check_task_pi_status(iser_task
, ISER_DIR_OUT
,
418 * iscsi_iser_conn_create() - create a new iscsi-iser connection
419 * @cls_session: iscsi class connection
420 * @conn_idx: connection index within the session (for MCS)
422 * Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL
425 static struct iscsi_cls_conn
*
426 iscsi_iser_conn_create(struct iscsi_cls_session
*cls_session
,
429 struct iscsi_conn
*conn
;
430 struct iscsi_cls_conn
*cls_conn
;
432 cls_conn
= iscsi_conn_setup(cls_session
, 0, conn_idx
);
435 conn
= cls_conn
->dd_data
;
438 * due to issues with the login code re iser sematics
439 * this not set in iscsi_conn_setup - FIXME
441 conn
->max_recv_dlength
= ISER_RECV_DATA_SEG_LEN
;
447 * iscsi_iser_conn_bind() - bind iscsi and iser connection structures
448 * @cls_session: iscsi class session
449 * @cls_conn: iscsi class connection
450 * @transport_eph: transport end-point handle
451 * @is_leading: indicate if this is the session leading connection (MCS)
453 * Return: zero on success, $error if iscsi_conn_bind fails and
454 * -EINVAL in case end-point doesn't exsits anymore or iser connection
455 * state is not UP (teardown already started).
458 iscsi_iser_conn_bind(struct iscsi_cls_session
*cls_session
,
459 struct iscsi_cls_conn
*cls_conn
,
460 uint64_t transport_eph
,
463 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
464 struct iser_conn
*iser_conn
;
465 struct iscsi_endpoint
*ep
;
468 error
= iscsi_conn_bind(cls_session
, cls_conn
, is_leading
);
472 /* the transport ep handle comes from user space so it must be
473 * verified against the global ib connections list */
474 ep
= iscsi_lookup_endpoint(transport_eph
);
476 iser_err("can't bind eph %llx\n",
477 (unsigned long long)transport_eph
);
480 iser_conn
= ep
->dd_data
;
482 mutex_lock(&iser_conn
->state_mutex
);
483 if (iser_conn
->state
!= ISER_CONN_UP
) {
485 iser_err("iser_conn %p state is %d, teardown started\n",
486 iser_conn
, iser_conn
->state
);
490 error
= iser_alloc_rx_descriptors(iser_conn
, conn
->session
);
494 /* binds the iSER connection retrieved from the previously
495 * connected ep_handle to the iSCSI layer connection. exchanges
496 * connection pointers */
497 iser_info("binding iscsi conn %p to iser_conn %p\n", conn
, iser_conn
);
499 conn
->dd_data
= iser_conn
;
500 iser_conn
->iscsi_conn
= conn
;
503 mutex_unlock(&iser_conn
->state_mutex
);
508 * iscsi_iser_conn_start() - start iscsi-iser connection
509 * @cls_conn: iscsi class connection
511 * Notes: Here iser intialize (or re-initialize) stop_completion as
512 * from this point iscsi must call conn_stop in session/connection
513 * teardown so iser transport must wait for it.
516 iscsi_iser_conn_start(struct iscsi_cls_conn
*cls_conn
)
518 struct iscsi_conn
*iscsi_conn
;
519 struct iser_conn
*iser_conn
;
521 iscsi_conn
= cls_conn
->dd_data
;
522 iser_conn
= iscsi_conn
->dd_data
;
523 reinit_completion(&iser_conn
->stop_completion
);
525 return iscsi_conn_start(cls_conn
);
529 * iscsi_iser_conn_stop() - stop iscsi-iser connection
530 * @cls_conn: iscsi class connection
531 * @flag: indicate if recover or terminate (passed as is)
533 * Notes: Calling iscsi_conn_stop might theoretically race with
534 * DEVICE_REMOVAL event and dereference a previously freed RDMA device
535 * handle, so we call it under iser the state lock to protect against
539 iscsi_iser_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
541 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
542 struct iser_conn
*iser_conn
= conn
->dd_data
;
544 iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn
, iser_conn
);
547 * Userspace may have goofed up and not bound the connection or
548 * might have only partially setup the connection.
551 mutex_lock(&iser_conn
->state_mutex
);
552 iser_conn_terminate(iser_conn
);
553 iscsi_conn_stop(cls_conn
, flag
);
556 iser_conn
->iscsi_conn
= NULL
;
557 conn
->dd_data
= NULL
;
559 complete(&iser_conn
->stop_completion
);
560 mutex_unlock(&iser_conn
->state_mutex
);
562 iscsi_conn_stop(cls_conn
, flag
);
567 * iscsi_iser_session_destroy() - destroy iscsi-iser session
568 * @cls_session: iscsi class session
570 * Removes and free iscsi host.
573 iscsi_iser_session_destroy(struct iscsi_cls_session
*cls_session
)
575 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
577 iscsi_session_teardown(cls_session
);
578 iscsi_host_remove(shost
);
579 iscsi_host_free(shost
);
582 static inline unsigned int
583 iser_dif_prot_caps(int prot_caps
)
585 return ((prot_caps
& IB_PROT_T10DIF_TYPE_1
) ?
586 SHOST_DIF_TYPE1_PROTECTION
| SHOST_DIX_TYPE0_PROTECTION
|
587 SHOST_DIX_TYPE1_PROTECTION
: 0) |
588 ((prot_caps
& IB_PROT_T10DIF_TYPE_2
) ?
589 SHOST_DIF_TYPE2_PROTECTION
| SHOST_DIX_TYPE2_PROTECTION
: 0) |
590 ((prot_caps
& IB_PROT_T10DIF_TYPE_3
) ?
591 SHOST_DIF_TYPE3_PROTECTION
| SHOST_DIX_TYPE3_PROTECTION
: 0);
595 * iscsi_iser_session_create() - create an iscsi-iser session
596 * @ep: iscsi end-point handle
597 * @cmds_max: maximum commands in this session
598 * @qdepth: session command queue depth
599 * @initial_cmdsn: initiator command sequnce number
601 * Allocates and adds a scsi host, expose DIF supprot if
602 * exists, and sets up an iscsi session.
604 static struct iscsi_cls_session
*
605 iscsi_iser_session_create(struct iscsi_endpoint
*ep
,
606 uint16_t cmds_max
, uint16_t qdepth
,
607 uint32_t initial_cmdsn
)
609 struct iscsi_cls_session
*cls_session
;
610 struct iscsi_session
*session
;
611 struct Scsi_Host
*shost
;
612 struct iser_conn
*iser_conn
= NULL
;
613 struct ib_conn
*ib_conn
;
616 shost
= iscsi_host_alloc(&iscsi_iser_sht
, 0, 0);
619 shost
->transportt
= iscsi_iser_scsi_transport
;
620 shost
->cmd_per_lun
= qdepth
;
621 shost
->max_lun
= iscsi_max_lun
;
623 shost
->max_channel
= 0;
624 shost
->max_cmd_len
= 16;
627 * older userspace tools (before 2.0-870) did not pass us
628 * the leading conn's ep so this will be NULL;
631 iser_conn
= ep
->dd_data
;
632 max_cmds
= iser_conn
->max_cmds
;
633 shost
->sg_tablesize
= iser_conn
->scsi_sg_tablesize
;
634 shost
->max_sectors
= iser_conn
->scsi_max_sectors
;
636 mutex_lock(&iser_conn
->state_mutex
);
637 if (iser_conn
->state
!= ISER_CONN_UP
) {
638 iser_err("iser conn %p already started teardown\n",
640 mutex_unlock(&iser_conn
->state_mutex
);
644 ib_conn
= &iser_conn
->ib_conn
;
645 if (ib_conn
->pi_support
) {
646 u32 sig_caps
= ib_conn
->device
->dev_attr
.sig_prot_cap
;
648 scsi_host_set_prot(shost
, iser_dif_prot_caps(sig_caps
));
649 scsi_host_set_guard(shost
, SHOST_DIX_GUARD_IP
|
650 SHOST_DIX_GUARD_CRC
);
654 * Limit the sg_tablesize and max_sectors based on the device
655 * max fastreg page list length.
657 shost
->sg_tablesize
= min_t(unsigned short, shost
->sg_tablesize
,
658 ib_conn
->device
->dev_attr
.max_fast_reg_page_list_len
);
659 shost
->max_sectors
= min_t(unsigned int,
660 1024, (shost
->sg_tablesize
* PAGE_SIZE
) >> 9);
662 if (iscsi_host_add(shost
,
663 ib_conn
->device
->ib_device
->dma_device
)) {
664 mutex_unlock(&iser_conn
->state_mutex
);
667 mutex_unlock(&iser_conn
->state_mutex
);
669 max_cmds
= ISER_DEF_XMIT_CMDS_MAX
;
670 if (iscsi_host_add(shost
, NULL
))
674 if (cmds_max
> max_cmds
) {
675 iser_info("cmds_max changed from %u to %u\n",
680 cls_session
= iscsi_session_setup(&iscsi_iser_transport
, shost
,
682 sizeof(struct iscsi_iser_task
),
686 session
= cls_session
->dd_data
;
688 shost
->can_queue
= session
->scsi_cmds_max
;
692 iscsi_host_remove(shost
);
694 iscsi_host_free(shost
);
699 iscsi_iser_set_param(struct iscsi_cls_conn
*cls_conn
,
700 enum iscsi_param param
, char *buf
, int buflen
)
705 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
708 case ISCSI_PARAM_HDRDGST_EN
:
709 sscanf(buf
, "%d", &value
);
711 iser_err("DataDigest wasn't negotiated to None\n");
715 case ISCSI_PARAM_DATADGST_EN
:
716 sscanf(buf
, "%d", &value
);
718 iser_err("DataDigest wasn't negotiated to None\n");
722 case ISCSI_PARAM_IFMARKER_EN
:
723 sscanf(buf
, "%d", &value
);
725 iser_err("IFMarker wasn't negotiated to No\n");
729 case ISCSI_PARAM_OFMARKER_EN
:
730 sscanf(buf
, "%d", &value
);
732 iser_err("OFMarker wasn't negotiated to No\n");
737 return iscsi_set_param(cls_conn
, param
, buf
, buflen
);
744 * iscsi_iser_set_param() - set class connection parameter
745 * @cls_conn: iscsi class connection
746 * @stats: iscsi stats to output
748 * Output connection statistics.
751 iscsi_iser_conn_get_stats(struct iscsi_cls_conn
*cls_conn
, struct iscsi_stats
*stats
)
753 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
755 stats
->txdata_octets
= conn
->txdata_octets
;
756 stats
->rxdata_octets
= conn
->rxdata_octets
;
757 stats
->scsicmd_pdus
= conn
->scsicmd_pdus_cnt
;
758 stats
->dataout_pdus
= conn
->dataout_pdus_cnt
;
759 stats
->scsirsp_pdus
= conn
->scsirsp_pdus_cnt
;
760 stats
->datain_pdus
= conn
->datain_pdus_cnt
; /* always 0 */
761 stats
->r2t_pdus
= conn
->r2t_pdus_cnt
; /* always 0 */
762 stats
->tmfcmd_pdus
= conn
->tmfcmd_pdus_cnt
;
763 stats
->tmfrsp_pdus
= conn
->tmfrsp_pdus_cnt
;
764 stats
->custom_length
= 1;
765 strcpy(stats
->custom
[0].desc
, "fmr_unalign_cnt");
766 stats
->custom
[0].value
= conn
->fmr_unalign_cnt
;
769 static int iscsi_iser_get_ep_param(struct iscsi_endpoint
*ep
,
770 enum iscsi_param param
, char *buf
)
772 struct iser_conn
*iser_conn
= ep
->dd_data
;
776 case ISCSI_PARAM_CONN_PORT
:
777 case ISCSI_PARAM_CONN_ADDRESS
:
778 if (!iser_conn
|| !iser_conn
->ib_conn
.cma_id
)
781 return iscsi_conn_get_addr_param((struct sockaddr_storage
*)
782 &iser_conn
->ib_conn
.cma_id
->route
.addr
.dst_addr
,
793 * iscsi_iser_ep_connect() - Initiate iSER connection establishment
795 * @dst_addr: destination address
796 * @non-blocking: indicate if routine can block
798 * Allocate an iscsi endpoint, an iser_conn structure and bind them.
799 * After that start RDMA connection establishment via rdma_cm. We
800 * don't allocate iser_conn embedded in iscsi_endpoint since in teardown
801 * the endpoint will be destroyed at ep_disconnect while iser_conn will
802 * cleanup its resources asynchronuously.
804 * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error)
807 static struct iscsi_endpoint
*
808 iscsi_iser_ep_connect(struct Scsi_Host
*shost
, struct sockaddr
*dst_addr
,
812 struct iser_conn
*iser_conn
;
813 struct iscsi_endpoint
*ep
;
815 ep
= iscsi_create_endpoint(0);
817 return ERR_PTR(-ENOMEM
);
819 iser_conn
= kzalloc(sizeof(*iser_conn
), GFP_KERNEL
);
825 ep
->dd_data
= iser_conn
;
827 iser_conn_init(iser_conn
);
829 err
= iser_connect(iser_conn
, NULL
, dst_addr
, non_blocking
);
835 iscsi_destroy_endpoint(ep
);
840 * iscsi_iser_ep_poll() - poll for iser connection establishment to complete
841 * @ep: iscsi endpoint (created at ep_connect)
842 * @timeout_ms: polling timeout allowed in ms.
844 * This routine boils down to waiting for up_completion signaling
845 * that cma_id got CONNECTED event.
847 * Return: 1 if succeeded in connection establishment, 0 if timeout expired
848 * (libiscsi will retry will kick in) or -1 if interrupted by signal
849 * or more likely iser connection state transitioned to TEMINATING or
850 * DOWN during the wait period.
853 iscsi_iser_ep_poll(struct iscsi_endpoint
*ep
, int timeout_ms
)
855 struct iser_conn
*iser_conn
= ep
->dd_data
;
858 rc
= wait_for_completion_interruptible_timeout(&iser_conn
->up_completion
,
859 msecs_to_jiffies(timeout_ms
));
860 /* if conn establishment failed, return error code to iscsi */
862 mutex_lock(&iser_conn
->state_mutex
);
863 if (iser_conn
->state
== ISER_CONN_TERMINATING
||
864 iser_conn
->state
== ISER_CONN_DOWN
)
866 mutex_unlock(&iser_conn
->state_mutex
);
869 iser_info("iser conn %p rc = %d\n", iser_conn
, rc
);
872 return 1; /* success, this is the equivalent of POLLOUT */
874 return 0; /* timeout */
876 return rc
; /* signal */
880 * iscsi_iser_ep_disconnect() - Initiate connection teardown process
881 * @ep: iscsi endpoint handle
883 * This routine is not blocked by iser and RDMA termination process
884 * completion as we queue a deffered work for iser/RDMA destruction
885 * and cleanup or actually call it immediately in case we didn't pass
886 * iscsi conn bind/start stage, thus it is safe.
889 iscsi_iser_ep_disconnect(struct iscsi_endpoint
*ep
)
891 struct iser_conn
*iser_conn
= ep
->dd_data
;
893 iser_info("ep %p iser conn %p\n", ep
, iser_conn
);
895 mutex_lock(&iser_conn
->state_mutex
);
896 iser_conn_terminate(iser_conn
);
899 * if iser_conn and iscsi_conn are bound, we must wait for
900 * iscsi_conn_stop and flush errors completion before freeing
901 * the iser resources. Otherwise we are safe to free resources
904 if (iser_conn
->iscsi_conn
) {
905 INIT_WORK(&iser_conn
->release_work
, iser_release_work
);
906 queue_work(release_wq
, &iser_conn
->release_work
);
907 mutex_unlock(&iser_conn
->state_mutex
);
909 iser_conn
->state
= ISER_CONN_DOWN
;
910 mutex_unlock(&iser_conn
->state_mutex
);
911 iser_conn_release(iser_conn
);
914 iscsi_destroy_endpoint(ep
);
917 static umode_t
iser_attr_is_visible(int param_type
, int param
)
919 switch (param_type
) {
920 case ISCSI_HOST_PARAM
:
922 case ISCSI_HOST_PARAM_NETDEV_NAME
:
923 case ISCSI_HOST_PARAM_HWADDRESS
:
924 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
931 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
932 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
933 case ISCSI_PARAM_HDRDGST_EN
:
934 case ISCSI_PARAM_DATADGST_EN
:
935 case ISCSI_PARAM_CONN_ADDRESS
:
936 case ISCSI_PARAM_CONN_PORT
:
937 case ISCSI_PARAM_EXP_STATSN
:
938 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
939 case ISCSI_PARAM_PERSISTENT_PORT
:
940 case ISCSI_PARAM_PING_TMO
:
941 case ISCSI_PARAM_RECV_TMO
:
942 case ISCSI_PARAM_INITIAL_R2T_EN
:
943 case ISCSI_PARAM_MAX_R2T
:
944 case ISCSI_PARAM_IMM_DATA_EN
:
945 case ISCSI_PARAM_FIRST_BURST
:
946 case ISCSI_PARAM_MAX_BURST
:
947 case ISCSI_PARAM_PDU_INORDER_EN
:
948 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
949 case ISCSI_PARAM_TARGET_NAME
:
950 case ISCSI_PARAM_TPGT
:
951 case ISCSI_PARAM_USERNAME
:
952 case ISCSI_PARAM_PASSWORD
:
953 case ISCSI_PARAM_USERNAME_IN
:
954 case ISCSI_PARAM_PASSWORD_IN
:
955 case ISCSI_PARAM_FAST_ABORT
:
956 case ISCSI_PARAM_ABORT_TMO
:
957 case ISCSI_PARAM_LU_RESET_TMO
:
958 case ISCSI_PARAM_TGT_RESET_TMO
:
959 case ISCSI_PARAM_IFACE_NAME
:
960 case ISCSI_PARAM_INITIATOR_NAME
:
961 case ISCSI_PARAM_DISCOVERY_SESS
:
971 static struct scsi_host_template iscsi_iser_sht
= {
972 .module
= THIS_MODULE
,
973 .name
= "iSCSI Initiator over iSER",
974 .queuecommand
= iscsi_queuecommand
,
975 .change_queue_depth
= scsi_change_queue_depth
,
976 .sg_tablesize
= ISCSI_ISER_DEF_SG_TABLESIZE
,
977 .max_sectors
= ISER_DEF_MAX_SECTORS
,
978 .cmd_per_lun
= ISER_DEF_CMD_PER_LUN
,
979 .eh_abort_handler
= iscsi_eh_abort
,
980 .eh_device_reset_handler
= iscsi_eh_device_reset
,
981 .eh_target_reset_handler
= iscsi_eh_recover_target
,
982 .target_alloc
= iscsi_target_alloc
,
983 .use_clustering
= DISABLE_CLUSTERING
,
984 .proc_name
= "iscsi_iser",
986 .track_queue_depth
= 1,
989 static struct iscsi_transport iscsi_iser_transport
= {
990 .owner
= THIS_MODULE
,
992 .caps
= CAP_RECOVERY_L0
| CAP_MULTI_R2T
| CAP_TEXT_NEGO
,
993 /* session management */
994 .create_session
= iscsi_iser_session_create
,
995 .destroy_session
= iscsi_iser_session_destroy
,
996 /* connection management */
997 .create_conn
= iscsi_iser_conn_create
,
998 .bind_conn
= iscsi_iser_conn_bind
,
999 .destroy_conn
= iscsi_conn_teardown
,
1000 .attr_is_visible
= iser_attr_is_visible
,
1001 .set_param
= iscsi_iser_set_param
,
1002 .get_conn_param
= iscsi_conn_get_param
,
1003 .get_ep_param
= iscsi_iser_get_ep_param
,
1004 .get_session_param
= iscsi_session_get_param
,
1005 .start_conn
= iscsi_iser_conn_start
,
1006 .stop_conn
= iscsi_iser_conn_stop
,
1007 /* iscsi host params */
1008 .get_host_param
= iscsi_host_get_param
,
1009 .set_host_param
= iscsi_host_set_param
,
1011 .send_pdu
= iscsi_conn_send_pdu
,
1012 .get_stats
= iscsi_iser_conn_get_stats
,
1013 .init_task
= iscsi_iser_task_init
,
1014 .xmit_task
= iscsi_iser_task_xmit
,
1015 .cleanup_task
= iscsi_iser_cleanup_task
,
1016 .alloc_pdu
= iscsi_iser_pdu_alloc
,
1017 .check_protection
= iscsi_iser_check_protection
,
1019 .session_recovery_timedout
= iscsi_session_recovery_timedout
,
1021 .ep_connect
= iscsi_iser_ep_connect
,
1022 .ep_poll
= iscsi_iser_ep_poll
,
1023 .ep_disconnect
= iscsi_iser_ep_disconnect
1026 static int __init
iser_init(void)
1030 iser_dbg("Starting iSER datamover...\n");
1032 if (iscsi_max_lun
< 1) {
1033 iser_err("Invalid max_lun value of %u\n", iscsi_max_lun
);
1037 memset(&ig
, 0, sizeof(struct iser_global
));
1039 ig
.desc_cache
= kmem_cache_create("iser_descriptors",
1040 sizeof(struct iser_tx_desc
),
1041 0, SLAB_HWCACHE_ALIGN
,
1043 if (ig
.desc_cache
== NULL
)
1046 /* device init is called only after the first addr resolution */
1047 mutex_init(&ig
.device_list_mutex
);
1048 INIT_LIST_HEAD(&ig
.device_list
);
1049 mutex_init(&ig
.connlist_mutex
);
1050 INIT_LIST_HEAD(&ig
.connlist
);
1052 release_wq
= alloc_workqueue("release workqueue", 0, 0);
1054 iser_err("failed to allocate release workqueue\n");
1058 iscsi_iser_scsi_transport
= iscsi_register_transport(
1059 &iscsi_iser_transport
);
1060 if (!iscsi_iser_scsi_transport
) {
1061 iser_err("iscsi_register_transport failed\n");
1063 goto register_transport_failure
;
1068 register_transport_failure
:
1069 kmem_cache_destroy(ig
.desc_cache
);
1074 static void __exit
iser_exit(void)
1076 struct iser_conn
*iser_conn
, *n
;
1079 iser_dbg("Removing iSER datamover...\n");
1080 destroy_workqueue(release_wq
);
1082 mutex_lock(&ig
.connlist_mutex
);
1083 connlist_empty
= list_empty(&ig
.connlist
);
1084 mutex_unlock(&ig
.connlist_mutex
);
1086 if (!connlist_empty
) {
1087 iser_err("Error cleanup stage completed but we still have iser "
1088 "connections, destroying them anyway\n");
1089 list_for_each_entry_safe(iser_conn
, n
, &ig
.connlist
,
1091 iser_conn_release(iser_conn
);
1095 iscsi_unregister_transport(&iscsi_iser_transport
);
1096 kmem_cache_destroy(ig
.desc_cache
);
1099 module_init(iser_init
);
1100 module_exit(iser_exit
);