1 /*******************************************************************************
2 * Vhost kernel TCM fabric driver for virtio SCSI initiators
4 * (C) Copyright 2010-2012 RisingTide Systems LLC.
5 * (C) Copyright 2010-2012 IBM Corp.
7 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
9 * Authors: Nicholas A. Bellinger <nab@risingtidesystems.com>
10 * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 ****************************************************************************/
24 #include <linux/module.h>
25 #include <linux/moduleparam.h>
26 #include <generated/utsrelease.h>
27 #include <linux/utsname.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <linux/kthread.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/configfs.h>
34 #include <linux/ctype.h>
35 #include <linux/compat.h>
36 #include <linux/eventfd.h>
37 #include <linux/vhost.h>
39 #include <linux/miscdevice.h>
40 #include <asm/unaligned.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_tcq.h>
43 #include <target/target_core_base.h>
44 #include <target/target_core_fabric.h>
45 #include <target/target_core_fabric_configfs.h>
46 #include <target/target_core_configfs.h>
47 #include <target/configfs_macros.h>
48 #include <linux/vhost.h>
49 #include <linux/virtio_net.h> /* TODO vhost.h currently depends on this */
50 #include <linux/virtio_scsi.h>
54 #include "tcm_vhost.h"
57 atomic_t vhost_ref_cnt
;
58 struct tcm_vhost_tpg
*vs_tpg
;
60 struct vhost_virtqueue vqs
[3];
62 struct vhost_work vs_completion_work
; /* cmd completion work item */
63 struct list_head vs_completion_list
; /* cmd completion queue */
64 spinlock_t vs_completion_lock
; /* protects s_completion_list */
67 /* Local pointer to allocated TCM configfs fabric module */
68 static struct target_fabric_configfs
*tcm_vhost_fabric_configfs
;
70 static struct workqueue_struct
*tcm_vhost_workqueue
;
72 /* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */
73 static DEFINE_MUTEX(tcm_vhost_mutex
);
74 static LIST_HEAD(tcm_vhost_list
);
76 static int tcm_vhost_check_true(struct se_portal_group
*se_tpg
)
81 static int tcm_vhost_check_false(struct se_portal_group
*se_tpg
)
86 static char *tcm_vhost_get_fabric_name(void)
91 static u8
tcm_vhost_get_fabric_proto_ident(struct se_portal_group
*se_tpg
)
93 struct tcm_vhost_tpg
*tpg
= container_of(se_tpg
,
94 struct tcm_vhost_tpg
, se_tpg
);
95 struct tcm_vhost_tport
*tport
= tpg
->tport
;
97 switch (tport
->tport_proto_id
) {
98 case SCSI_PROTOCOL_SAS
:
99 return sas_get_fabric_proto_ident(se_tpg
);
100 case SCSI_PROTOCOL_FCP
:
101 return fc_get_fabric_proto_ident(se_tpg
);
102 case SCSI_PROTOCOL_ISCSI
:
103 return iscsi_get_fabric_proto_ident(se_tpg
);
105 pr_err("Unknown tport_proto_id: 0x%02x, using"
106 " SAS emulation\n", tport
->tport_proto_id
);
110 return sas_get_fabric_proto_ident(se_tpg
);
113 static char *tcm_vhost_get_fabric_wwn(struct se_portal_group
*se_tpg
)
115 struct tcm_vhost_tpg
*tpg
= container_of(se_tpg
,
116 struct tcm_vhost_tpg
, se_tpg
);
117 struct tcm_vhost_tport
*tport
= tpg
->tport
;
119 return &tport
->tport_name
[0];
122 static u16
tcm_vhost_get_tag(struct se_portal_group
*se_tpg
)
124 struct tcm_vhost_tpg
*tpg
= container_of(se_tpg
,
125 struct tcm_vhost_tpg
, se_tpg
);
126 return tpg
->tport_tpgt
;
129 static u32
tcm_vhost_get_default_depth(struct se_portal_group
*se_tpg
)
134 static u32
tcm_vhost_get_pr_transport_id(
135 struct se_portal_group
*se_tpg
,
136 struct se_node_acl
*se_nacl
,
137 struct t10_pr_registration
*pr_reg
,
141 struct tcm_vhost_tpg
*tpg
= container_of(se_tpg
,
142 struct tcm_vhost_tpg
, se_tpg
);
143 struct tcm_vhost_tport
*tport
= tpg
->tport
;
145 switch (tport
->tport_proto_id
) {
146 case SCSI_PROTOCOL_SAS
:
147 return sas_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
149 case SCSI_PROTOCOL_FCP
:
150 return fc_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
152 case SCSI_PROTOCOL_ISCSI
:
153 return iscsi_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
156 pr_err("Unknown tport_proto_id: 0x%02x, using"
157 " SAS emulation\n", tport
->tport_proto_id
);
161 return sas_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
165 static u32
tcm_vhost_get_pr_transport_id_len(
166 struct se_portal_group
*se_tpg
,
167 struct se_node_acl
*se_nacl
,
168 struct t10_pr_registration
*pr_reg
,
171 struct tcm_vhost_tpg
*tpg
= container_of(se_tpg
,
172 struct tcm_vhost_tpg
, se_tpg
);
173 struct tcm_vhost_tport
*tport
= tpg
->tport
;
175 switch (tport
->tport_proto_id
) {
176 case SCSI_PROTOCOL_SAS
:
177 return sas_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
179 case SCSI_PROTOCOL_FCP
:
180 return fc_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
182 case SCSI_PROTOCOL_ISCSI
:
183 return iscsi_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
186 pr_err("Unknown tport_proto_id: 0x%02x, using"
187 " SAS emulation\n", tport
->tport_proto_id
);
191 return sas_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
195 static char *tcm_vhost_parse_pr_out_transport_id(
196 struct se_portal_group
*se_tpg
,
199 char **port_nexus_ptr
)
201 struct tcm_vhost_tpg
*tpg
= container_of(se_tpg
,
202 struct tcm_vhost_tpg
, se_tpg
);
203 struct tcm_vhost_tport
*tport
= tpg
->tport
;
205 switch (tport
->tport_proto_id
) {
206 case SCSI_PROTOCOL_SAS
:
207 return sas_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
209 case SCSI_PROTOCOL_FCP
:
210 return fc_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
212 case SCSI_PROTOCOL_ISCSI
:
213 return iscsi_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
216 pr_err("Unknown tport_proto_id: 0x%02x, using"
217 " SAS emulation\n", tport
->tport_proto_id
);
221 return sas_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
225 static struct se_node_acl
*tcm_vhost_alloc_fabric_acl(
226 struct se_portal_group
*se_tpg
)
228 struct tcm_vhost_nacl
*nacl
;
230 nacl
= kzalloc(sizeof(struct tcm_vhost_nacl
), GFP_KERNEL
);
232 pr_err("Unable to alocate struct tcm_vhost_nacl\n");
236 return &nacl
->se_node_acl
;
239 static void tcm_vhost_release_fabric_acl(
240 struct se_portal_group
*se_tpg
,
241 struct se_node_acl
*se_nacl
)
243 struct tcm_vhost_nacl
*nacl
= container_of(se_nacl
,
244 struct tcm_vhost_nacl
, se_node_acl
);
248 static u32
tcm_vhost_tpg_get_inst_index(struct se_portal_group
*se_tpg
)
253 static void tcm_vhost_release_cmd(struct se_cmd
*se_cmd
)
258 static int tcm_vhost_shutdown_session(struct se_session
*se_sess
)
263 static void tcm_vhost_close_session(struct se_session
*se_sess
)
268 static u32
tcm_vhost_sess_get_index(struct se_session
*se_sess
)
273 static int tcm_vhost_write_pending(struct se_cmd
*se_cmd
)
275 /* Go ahead and process the write immediately */
276 target_execute_cmd(se_cmd
);
280 static int tcm_vhost_write_pending_status(struct se_cmd
*se_cmd
)
285 static void tcm_vhost_set_default_node_attrs(struct se_node_acl
*nacl
)
290 static u32
tcm_vhost_get_task_tag(struct se_cmd
*se_cmd
)
295 static int tcm_vhost_get_cmd_state(struct se_cmd
*se_cmd
)
300 static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd
*);
302 static int tcm_vhost_queue_data_in(struct se_cmd
*se_cmd
)
304 struct tcm_vhost_cmd
*tv_cmd
= container_of(se_cmd
,
305 struct tcm_vhost_cmd
, tvc_se_cmd
);
306 vhost_scsi_complete_cmd(tv_cmd
);
310 static int tcm_vhost_queue_status(struct se_cmd
*se_cmd
)
312 struct tcm_vhost_cmd
*tv_cmd
= container_of(se_cmd
,
313 struct tcm_vhost_cmd
, tvc_se_cmd
);
314 vhost_scsi_complete_cmd(tv_cmd
);
318 static int tcm_vhost_queue_tm_rsp(struct se_cmd
*se_cmd
)
323 static u16
tcm_vhost_set_fabric_sense_len(struct se_cmd
*se_cmd
,
329 static u16
tcm_vhost_get_fabric_sense_len(void)
334 static void vhost_scsi_free_cmd(struct tcm_vhost_cmd
*tv_cmd
)
336 struct se_cmd
*se_cmd
= &tv_cmd
->tvc_se_cmd
;
338 /* TODO locking against target/backend threads? */
339 transport_generic_free_cmd(se_cmd
, 1);
341 if (tv_cmd
->tvc_sgl_count
) {
343 for (i
= 0; i
< tv_cmd
->tvc_sgl_count
; i
++)
344 put_page(sg_page(&tv_cmd
->tvc_sgl
[i
]));
346 kfree(tv_cmd
->tvc_sgl
);
352 /* Dequeue a command from the completion list */
353 static struct tcm_vhost_cmd
*vhost_scsi_get_cmd_from_completion(
354 struct vhost_scsi
*vs
)
356 struct tcm_vhost_cmd
*tv_cmd
= NULL
;
358 spin_lock_bh(&vs
->vs_completion_lock
);
359 if (list_empty(&vs
->vs_completion_list
)) {
360 spin_unlock_bh(&vs
->vs_completion_lock
);
364 list_for_each_entry(tv_cmd
, &vs
->vs_completion_list
,
365 tvc_completion_list
) {
366 list_del(&tv_cmd
->tvc_completion_list
);
369 spin_unlock_bh(&vs
->vs_completion_lock
);
373 /* Fill in status and signal that we are done processing this command
375 * This is scheduled in the vhost work queue so we are called with the owner
376 * process mm and can access the vring.
378 static void vhost_scsi_complete_cmd_work(struct vhost_work
*work
)
380 struct vhost_scsi
*vs
= container_of(work
, struct vhost_scsi
,
382 struct tcm_vhost_cmd
*tv_cmd
;
384 while ((tv_cmd
= vhost_scsi_get_cmd_from_completion(vs
)) != NULL
) {
385 struct virtio_scsi_cmd_resp v_rsp
;
386 struct se_cmd
*se_cmd
= &tv_cmd
->tvc_se_cmd
;
389 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__
,
390 tv_cmd
, se_cmd
->residual_count
, se_cmd
->scsi_status
);
392 memset(&v_rsp
, 0, sizeof(v_rsp
));
393 v_rsp
.resid
= se_cmd
->residual_count
;
394 /* TODO is status_qualifier field needed? */
395 v_rsp
.status
= se_cmd
->scsi_status
;
396 v_rsp
.sense_len
= se_cmd
->scsi_sense_length
;
397 memcpy(v_rsp
.sense
, tv_cmd
->tvc_sense_buf
,
399 ret
= copy_to_user(tv_cmd
->tvc_resp
, &v_rsp
, sizeof(v_rsp
));
400 if (likely(ret
== 0))
401 vhost_add_used(&vs
->vqs
[2], tv_cmd
->tvc_vq_desc
, 0);
403 pr_err("Faulted on virtio_scsi_cmd_resp\n");
405 vhost_scsi_free_cmd(tv_cmd
);
408 vhost_signal(&vs
->dev
, &vs
->vqs
[2]);
411 static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd
*tv_cmd
)
413 struct vhost_scsi
*vs
= tv_cmd
->tvc_vhost
;
415 pr_debug("%s tv_cmd %p\n", __func__
, tv_cmd
);
417 spin_lock_bh(&vs
->vs_completion_lock
);
418 list_add_tail(&tv_cmd
->tvc_completion_list
, &vs
->vs_completion_list
);
419 spin_unlock_bh(&vs
->vs_completion_lock
);
421 vhost_work_queue(&vs
->dev
, &vs
->vs_completion_work
);
424 static struct tcm_vhost_cmd
*vhost_scsi_allocate_cmd(
425 struct tcm_vhost_tpg
*tv_tpg
,
426 struct virtio_scsi_cmd_req
*v_req
,
430 struct tcm_vhost_cmd
*tv_cmd
;
431 struct tcm_vhost_nexus
*tv_nexus
;
432 struct se_portal_group
*se_tpg
= &tv_tpg
->se_tpg
;
433 struct se_session
*se_sess
;
434 struct se_cmd
*se_cmd
;
437 tv_nexus
= tv_tpg
->tpg_nexus
;
439 pr_err("Unable to locate active struct tcm_vhost_nexus\n");
440 return ERR_PTR(-EIO
);
442 se_sess
= tv_nexus
->tvn_se_sess
;
444 tv_cmd
= kzalloc(sizeof(struct tcm_vhost_cmd
), GFP_ATOMIC
);
446 pr_err("Unable to allocate struct tcm_vhost_cmd\n");
447 return ERR_PTR(-ENOMEM
);
449 INIT_LIST_HEAD(&tv_cmd
->tvc_completion_list
);
450 tv_cmd
->tvc_tag
= v_req
->tag
;
452 se_cmd
= &tv_cmd
->tvc_se_cmd
;
454 * Locate the SAM Task Attr from virtio_scsi_cmd_req
456 sam_task_attr
= v_req
->task_attr
;
458 * Initialize struct se_cmd descriptor from TCM infrastructure
460 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
, exp_data_len
,
461 data_direction
, sam_task_attr
,
462 &tv_cmd
->tvc_sense_buf
[0]);
464 #if 0 /* FIXME: vhost_scsi_allocate_cmd() BIDI operation */
466 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
472 * Map a user memory range into a scatterlist
474 * Returns the number of scatterlist entries used or -errno on error.
476 static int vhost_scsi_map_to_sgl(struct scatterlist
*sgl
,
477 unsigned int sgl_count
, void __user
*ptr
, size_t len
, int write
)
479 struct scatterlist
*sg
= sgl
;
480 unsigned int npages
= 0;
485 unsigned int offset
= (uintptr_t)ptr
& ~PAGE_MASK
;
486 unsigned int nbytes
= min_t(unsigned int,
487 PAGE_SIZE
- offset
, len
);
489 if (npages
== sgl_count
) {
494 ret
= get_user_pages_fast((unsigned long)ptr
, 1, write
, &page
);
495 BUG_ON(ret
== 0); /* we should either get our page or fail */
499 sg_set_page(sg
, page
, nbytes
, offset
);
508 /* Put pages that we hold */
509 for (sg
= sgl
; sg
!= &sgl
[npages
]; sg
++)
510 put_page(sg_page(sg
));
514 static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd
*tv_cmd
,
515 struct iovec
*iov
, unsigned int niov
, int write
)
520 struct scatterlist
*sg
;
523 * Find out how long sglist needs to be
526 for (i
= 0; i
< niov
; i
++) {
527 sgl_count
+= (((uintptr_t)iov
[i
].iov_base
+ iov
[i
].iov_len
+
528 PAGE_SIZE
- 1) >> PAGE_SHIFT
) -
529 ((uintptr_t)iov
[i
].iov_base
>> PAGE_SHIFT
);
531 /* TODO overflow checking */
533 sg
= kmalloc(sizeof(tv_cmd
->tvc_sgl
[0]) * sgl_count
, GFP_ATOMIC
);
536 pr_debug("%s sg %p sgl_count %u is_err %ld\n", __func__
,
537 sg
, sgl_count
, IS_ERR(sg
));
538 sg_init_table(sg
, sgl_count
);
540 tv_cmd
->tvc_sgl
= sg
;
541 tv_cmd
->tvc_sgl_count
= sgl_count
;
543 pr_debug("Mapping %u iovecs for %u pages\n", niov
, sgl_count
);
544 for (i
= 0; i
< niov
; i
++) {
545 ret
= vhost_scsi_map_to_sgl(sg
, sgl_count
, iov
[i
].iov_base
,
546 iov
[i
].iov_len
, write
);
548 for (i
= 0; i
< tv_cmd
->tvc_sgl_count
; i
++)
549 put_page(sg_page(&tv_cmd
->tvc_sgl
[i
]));
550 kfree(tv_cmd
->tvc_sgl
);
551 tv_cmd
->tvc_sgl
= NULL
;
552 tv_cmd
->tvc_sgl_count
= 0;
562 static void tcm_vhost_submission_work(struct work_struct
*work
)
564 struct tcm_vhost_cmd
*tv_cmd
=
565 container_of(work
, struct tcm_vhost_cmd
, work
);
566 struct se_cmd
*se_cmd
= &tv_cmd
->tvc_se_cmd
;
567 struct scatterlist
*sg_ptr
, *sg_bidi_ptr
= NULL
;
568 int rc
, sg_no_bidi
= 0;
570 * Locate the struct se_lun pointer based on v_req->lun, and
571 * attach it to struct se_cmd
573 rc
= transport_lookup_cmd_lun(&tv_cmd
->tvc_se_cmd
, tv_cmd
->tvc_lun
);
575 pr_err("Failed to look up lun: %d\n", tv_cmd
->tvc_lun
);
576 transport_send_check_condition_and_sense(&tv_cmd
->tvc_se_cmd
,
577 tv_cmd
->tvc_se_cmd
.scsi_sense_reason
, 0);
578 transport_generic_free_cmd(se_cmd
, 0);
582 rc
= target_setup_cmd_from_cdb(se_cmd
, tv_cmd
->tvc_cdb
);
584 transport_send_check_condition_and_sense(se_cmd
,
585 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
, 0);
586 transport_generic_free_cmd(se_cmd
, 0);
589 if (se_cmd
->se_cmd_flags
& SCF_SCSI_RESERVATION_CONFLICT
)
590 tcm_vhost_queue_status(se_cmd
);
592 transport_send_check_condition_and_sense(se_cmd
,
593 se_cmd
->scsi_sense_reason
, 0);
594 transport_generic_free_cmd(se_cmd
, 0);
598 if (tv_cmd
->tvc_sgl_count
) {
599 sg_ptr
= tv_cmd
->tvc_sgl
;
601 * For BIDI commands, pass in the extra READ buffer
602 * to transport_generic_map_mem_to_cmd() below..
604 /* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */
606 if (se_cmd
->se_cmd_flags
& SCF_BIDI
) {
615 rc
= transport_generic_map_mem_to_cmd(se_cmd
, sg_ptr
,
616 tv_cmd
->tvc_sgl_count
, sg_bidi_ptr
,
619 transport_send_check_condition_and_sense(se_cmd
,
620 se_cmd
->scsi_sense_reason
, 0);
621 transport_generic_free_cmd(se_cmd
, 0);
624 transport_handle_cdb_direct(se_cmd
);
627 static void vhost_scsi_handle_vq(struct vhost_scsi
*vs
)
629 struct vhost_virtqueue
*vq
= &vs
->vqs
[2];
630 struct virtio_scsi_cmd_req v_req
;
631 struct tcm_vhost_tpg
*tv_tpg
;
632 struct tcm_vhost_cmd
*tv_cmd
;
633 u32 exp_data_len
, data_first
, data_num
, data_direction
;
637 /* Must use ioctl VHOST_SCSI_SET_ENDPOINT */
639 if (unlikely(!tv_tpg
)) {
640 pr_err("%s endpoint not set\n", __func__
);
644 mutex_lock(&vq
->mutex
);
645 vhost_disable_notify(&vs
->dev
, vq
);
648 head
= vhost_get_vq_desc(&vs
->dev
, vq
, vq
->iov
,
649 ARRAY_SIZE(vq
->iov
), &out
, &in
,
651 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
653 /* On error, stop handling until the next kick. */
654 if (unlikely(head
< 0))
656 /* Nothing new? Wait for eventfd to tell us they refilled. */
657 if (head
== vq
->num
) {
658 if (unlikely(vhost_enable_notify(&vs
->dev
, vq
))) {
659 vhost_disable_notify(&vs
->dev
, vq
);
665 /* FIXME: BIDI operation */
666 if (out
== 1 && in
== 1) {
667 data_direction
= DMA_NONE
;
670 } else if (out
== 1 && in
> 1) {
671 data_direction
= DMA_FROM_DEVICE
;
672 data_first
= out
+ 1;
674 } else if (out
> 1 && in
== 1) {
675 data_direction
= DMA_TO_DEVICE
;
679 vq_err(vq
, "Invalid buffer layout out: %u in: %u\n",
685 * Check for a sane resp buffer so we can report errors to
688 if (unlikely(vq
->iov
[out
].iov_len
!=
689 sizeof(struct virtio_scsi_cmd_resp
))) {
690 vq_err(vq
, "Expecting virtio_scsi_cmd_resp, got %zu"
691 " bytes\n", vq
->iov
[out
].iov_len
);
695 if (unlikely(vq
->iov
[0].iov_len
!= sizeof(v_req
))) {
696 vq_err(vq
, "Expecting virtio_scsi_cmd_req, got %zu"
697 " bytes\n", vq
->iov
[0].iov_len
);
700 pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p,"
701 " len: %zu\n", vq
->iov
[0].iov_base
, sizeof(v_req
));
702 ret
= __copy_from_user(&v_req
, vq
->iov
[0].iov_base
,
705 vq_err(vq
, "Faulted on virtio_scsi_cmd_req\n");
710 for (i
= 0; i
< data_num
; i
++)
711 exp_data_len
+= vq
->iov
[data_first
+ i
].iov_len
;
713 tv_cmd
= vhost_scsi_allocate_cmd(tv_tpg
, &v_req
,
714 exp_data_len
, data_direction
);
715 if (IS_ERR(tv_cmd
)) {
716 vq_err(vq
, "vhost_scsi_allocate_cmd failed %ld\n",
720 pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
721 ": %d\n", tv_cmd
, exp_data_len
, data_direction
);
723 tv_cmd
->tvc_vhost
= vs
;
725 if (unlikely(vq
->iov
[out
].iov_len
!=
726 sizeof(struct virtio_scsi_cmd_resp
))) {
727 vq_err(vq
, "Expecting virtio_scsi_cmd_resp, got %zu"
728 " bytes, out: %d, in: %d\n",
729 vq
->iov
[out
].iov_len
, out
, in
);
733 tv_cmd
->tvc_resp
= vq
->iov
[out
].iov_base
;
736 * Copy in the recieved CDB descriptor into tv_cmd->tvc_cdb
737 * that will be used by tcm_vhost_new_cmd_map() and down into
738 * target_setup_cmd_from_cdb()
740 memcpy(tv_cmd
->tvc_cdb
, v_req
.cdb
, TCM_VHOST_MAX_CDB_SIZE
);
742 * Check that the recieved CDB size does not exceeded our
743 * hardcoded max for tcm_vhost
745 /* TODO what if cdb was too small for varlen cdb header? */
746 if (unlikely(scsi_command_size(tv_cmd
->tvc_cdb
) >
747 TCM_VHOST_MAX_CDB_SIZE
)) {
748 vq_err(vq
, "Received SCSI CDB with command_size: %d that"
749 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
750 scsi_command_size(tv_cmd
->tvc_cdb
),
751 TCM_VHOST_MAX_CDB_SIZE
);
754 tv_cmd
->tvc_lun
= ((v_req
.lun
[2] << 8) | v_req
.lun
[3]) & 0x3FFF;
756 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
757 tv_cmd
->tvc_cdb
[0], tv_cmd
->tvc_lun
);
759 if (data_direction
!= DMA_NONE
) {
760 ret
= vhost_scsi_map_iov_to_sgl(tv_cmd
,
761 &vq
->iov
[data_first
], data_num
,
762 data_direction
== DMA_TO_DEVICE
);
764 vq_err(vq
, "Failed to map iov to sgl\n");
770 * Save the descriptor from vhost_get_vq_desc() to be used to
771 * complete the virtio-scsi request in TCM callback context via
772 * tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
774 tv_cmd
->tvc_vq_desc
= head
;
776 * Dispatch tv_cmd descriptor for cmwq execution in process
777 * context provided by tcm_vhost_workqueue. This also ensures
778 * tv_cmd is executed on the same kworker CPU as this vhost
779 * thread to gain positive L2 cache locality effects..
781 INIT_WORK(&tv_cmd
->work
, tcm_vhost_submission_work
);
782 queue_work(tcm_vhost_workqueue
, &tv_cmd
->work
);
785 mutex_unlock(&vq
->mutex
);
788 static void vhost_scsi_ctl_handle_kick(struct vhost_work
*work
)
790 pr_err("%s: The handling func for control queue.\n", __func__
);
793 static void vhost_scsi_evt_handle_kick(struct vhost_work
*work
)
795 pr_err("%s: The handling func for event queue.\n", __func__
);
798 static void vhost_scsi_handle_kick(struct vhost_work
*work
)
800 struct vhost_virtqueue
*vq
= container_of(work
, struct vhost_virtqueue
,
802 struct vhost_scsi
*vs
= container_of(vq
->dev
, struct vhost_scsi
, dev
);
804 vhost_scsi_handle_vq(vs
);
808 * Called from vhost_scsi_ioctl() context to walk the list of available
809 * tcm_vhost_tpg with an active struct tcm_vhost_nexus
811 static int vhost_scsi_set_endpoint(
812 struct vhost_scsi
*vs
,
813 struct vhost_scsi_target
*t
)
815 struct tcm_vhost_tport
*tv_tport
;
816 struct tcm_vhost_tpg
*tv_tpg
;
819 mutex_lock(&vs
->dev
.mutex
);
820 /* Verify that ring has been setup correctly. */
821 for (index
= 0; index
< vs
->dev
.nvqs
; ++index
) {
822 /* Verify that ring has been setup correctly. */
823 if (!vhost_vq_access_ok(&vs
->vqs
[index
])) {
824 mutex_unlock(&vs
->dev
.mutex
);
830 mutex_unlock(&vs
->dev
.mutex
);
833 mutex_unlock(&vs
->dev
.mutex
);
835 mutex_lock(&tcm_vhost_mutex
);
836 list_for_each_entry(tv_tpg
, &tcm_vhost_list
, tv_tpg_list
) {
837 mutex_lock(&tv_tpg
->tv_tpg_mutex
);
838 if (!tv_tpg
->tpg_nexus
) {
839 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
842 if (atomic_read(&tv_tpg
->tv_tpg_vhost_count
)) {
843 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
846 tv_tport
= tv_tpg
->tport
;
848 if (!strcmp(tv_tport
->tport_name
, t
->vhost_wwpn
) &&
849 (tv_tpg
->tport_tpgt
== t
->vhost_tpgt
)) {
850 atomic_inc(&tv_tpg
->tv_tpg_vhost_count
);
851 smp_mb__after_atomic_inc();
852 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
853 mutex_unlock(&tcm_vhost_mutex
);
855 mutex_lock(&vs
->dev
.mutex
);
857 atomic_inc(&vs
->vhost_ref_cnt
);
858 smp_mb__after_atomic_inc();
859 mutex_unlock(&vs
->dev
.mutex
);
862 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
864 mutex_unlock(&tcm_vhost_mutex
);
868 static int vhost_scsi_clear_endpoint(
869 struct vhost_scsi
*vs
,
870 struct vhost_scsi_target
*t
)
872 struct tcm_vhost_tport
*tv_tport
;
873 struct tcm_vhost_tpg
*tv_tpg
;
876 mutex_lock(&vs
->dev
.mutex
);
877 /* Verify that ring has been setup correctly. */
878 for (index
= 0; index
< vs
->dev
.nvqs
; ++index
) {
879 if (!vhost_vq_access_ok(&vs
->vqs
[index
])) {
880 mutex_unlock(&vs
->dev
.mutex
);
886 mutex_unlock(&vs
->dev
.mutex
);
890 tv_tport
= tv_tpg
->tport
;
892 if (strcmp(tv_tport
->tport_name
, t
->vhost_wwpn
) ||
893 (tv_tpg
->tport_tpgt
!= t
->vhost_tpgt
)) {
894 mutex_unlock(&vs
->dev
.mutex
);
895 pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu"
896 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
897 tv_tport
->tport_name
, tv_tpg
->tport_tpgt
,
898 t
->vhost_wwpn
, t
->vhost_tpgt
);
901 atomic_dec(&tv_tpg
->tv_tpg_vhost_count
);
903 mutex_unlock(&vs
->dev
.mutex
);
908 static int vhost_scsi_open(struct inode
*inode
, struct file
*f
)
910 struct vhost_scsi
*s
;
913 s
= kzalloc(sizeof(*s
), GFP_KERNEL
);
917 vhost_work_init(&s
->vs_completion_work
, vhost_scsi_complete_cmd_work
);
918 INIT_LIST_HEAD(&s
->vs_completion_list
);
919 spin_lock_init(&s
->vs_completion_lock
);
921 s
->vqs
[0].handle_kick
= vhost_scsi_ctl_handle_kick
;
922 s
->vqs
[1].handle_kick
= vhost_scsi_evt_handle_kick
;
923 s
->vqs
[2].handle_kick
= vhost_scsi_handle_kick
;
924 r
= vhost_dev_init(&s
->dev
, s
->vqs
, 3);
934 static int vhost_scsi_release(struct inode
*inode
, struct file
*f
)
936 struct vhost_scsi
*s
= f
->private_data
;
938 if (s
->vs_tpg
&& s
->vs_tpg
->tport
) {
939 struct vhost_scsi_target backend
;
941 memcpy(backend
.vhost_wwpn
, s
->vs_tpg
->tport
->tport_name
,
942 sizeof(backend
.vhost_wwpn
));
943 backend
.vhost_tpgt
= s
->vs_tpg
->tport_tpgt
;
944 vhost_scsi_clear_endpoint(s
, &backend
);
947 vhost_dev_cleanup(&s
->dev
, false);
952 static int vhost_scsi_set_features(struct vhost_scsi
*vs
, u64 features
)
954 if (features
& ~VHOST_FEATURES
)
957 mutex_lock(&vs
->dev
.mutex
);
958 if ((features
& (1 << VHOST_F_LOG_ALL
)) &&
959 !vhost_log_access_ok(&vs
->dev
)) {
960 mutex_unlock(&vs
->dev
.mutex
);
963 vs
->dev
.acked_features
= features
;
964 /* TODO possibly smp_wmb() and flush vqs */
965 mutex_unlock(&vs
->dev
.mutex
);
969 static long vhost_scsi_ioctl(struct file
*f
, unsigned int ioctl
,
972 struct vhost_scsi
*vs
= f
->private_data
;
973 struct vhost_scsi_target backend
;
974 void __user
*argp
= (void __user
*)arg
;
975 u64 __user
*featurep
= argp
;
980 case VHOST_SCSI_SET_ENDPOINT
:
981 if (copy_from_user(&backend
, argp
, sizeof backend
))
984 return vhost_scsi_set_endpoint(vs
, &backend
);
985 case VHOST_SCSI_CLEAR_ENDPOINT
:
986 if (copy_from_user(&backend
, argp
, sizeof backend
))
989 return vhost_scsi_clear_endpoint(vs
, &backend
);
990 case VHOST_SCSI_GET_ABI_VERSION
:
991 if (copy_from_user(&backend
, argp
, sizeof backend
))
994 backend
.abi_version
= VHOST_SCSI_ABI_VERSION
;
996 if (copy_to_user(argp
, &backend
, sizeof backend
))
999 case VHOST_GET_FEATURES
:
1000 features
= VHOST_FEATURES
;
1001 if (copy_to_user(featurep
, &features
, sizeof features
))
1004 case VHOST_SET_FEATURES
:
1005 if (copy_from_user(&features
, featurep
, sizeof features
))
1007 return vhost_scsi_set_features(vs
, features
);
1009 mutex_lock(&vs
->dev
.mutex
);
1010 r
= vhost_dev_ioctl(&vs
->dev
, ioctl
, arg
);
1011 mutex_unlock(&vs
->dev
.mutex
);
1016 static const struct file_operations vhost_scsi_fops
= {
1017 .owner
= THIS_MODULE
,
1018 .release
= vhost_scsi_release
,
1019 .unlocked_ioctl
= vhost_scsi_ioctl
,
1020 /* TODO compat ioctl? */
1021 .open
= vhost_scsi_open
,
1022 .llseek
= noop_llseek
,
1025 static struct miscdevice vhost_scsi_misc
= {
1031 static int __init
vhost_scsi_register(void)
1033 return misc_register(&vhost_scsi_misc
);
1036 static int vhost_scsi_deregister(void)
1038 return misc_deregister(&vhost_scsi_misc
);
1041 static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport
*tport
)
1043 switch (tport
->tport_proto_id
) {
1044 case SCSI_PROTOCOL_SAS
:
1046 case SCSI_PROTOCOL_FCP
:
1048 case SCSI_PROTOCOL_ISCSI
:
1057 static int tcm_vhost_port_link(
1058 struct se_portal_group
*se_tpg
,
1061 struct tcm_vhost_tpg
*tv_tpg
= container_of(se_tpg
,
1062 struct tcm_vhost_tpg
, se_tpg
);
1064 atomic_inc(&tv_tpg
->tv_tpg_port_count
);
1065 smp_mb__after_atomic_inc();
1070 static void tcm_vhost_port_unlink(
1071 struct se_portal_group
*se_tpg
,
1072 struct se_lun
*se_lun
)
1074 struct tcm_vhost_tpg
*tv_tpg
= container_of(se_tpg
,
1075 struct tcm_vhost_tpg
, se_tpg
);
1077 atomic_dec(&tv_tpg
->tv_tpg_port_count
);
1078 smp_mb__after_atomic_dec();
1081 static struct se_node_acl
*tcm_vhost_make_nodeacl(
1082 struct se_portal_group
*se_tpg
,
1083 struct config_group
*group
,
1086 struct se_node_acl
*se_nacl
, *se_nacl_new
;
1087 struct tcm_vhost_nacl
*nacl
;
1091 /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1092 return ERR_PTR(-EINVAL); */
1093 se_nacl_new
= tcm_vhost_alloc_fabric_acl(se_tpg
);
1095 return ERR_PTR(-ENOMEM
);
1099 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1100 * when converting a NodeACL from demo mode -> explict
1102 se_nacl
= core_tpg_add_initiator_node_acl(se_tpg
, se_nacl_new
,
1104 if (IS_ERR(se_nacl
)) {
1105 tcm_vhost_release_fabric_acl(se_tpg
, se_nacl_new
);
1109 * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN
1111 nacl
= container_of(se_nacl
, struct tcm_vhost_nacl
, se_node_acl
);
1112 nacl
->iport_wwpn
= wwpn
;
1117 static void tcm_vhost_drop_nodeacl(struct se_node_acl
*se_acl
)
1119 struct tcm_vhost_nacl
*nacl
= container_of(se_acl
,
1120 struct tcm_vhost_nacl
, se_node_acl
);
1121 core_tpg_del_initiator_node_acl(se_acl
->se_tpg
, se_acl
, 1);
1125 static int tcm_vhost_make_nexus(
1126 struct tcm_vhost_tpg
*tv_tpg
,
1129 struct se_portal_group
*se_tpg
;
1130 struct tcm_vhost_nexus
*tv_nexus
;
1132 mutex_lock(&tv_tpg
->tv_tpg_mutex
);
1133 if (tv_tpg
->tpg_nexus
) {
1134 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1135 pr_debug("tv_tpg->tpg_nexus already exists\n");
1138 se_tpg
= &tv_tpg
->se_tpg
;
1140 tv_nexus
= kzalloc(sizeof(struct tcm_vhost_nexus
), GFP_KERNEL
);
1142 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1143 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1147 * Initialize the struct se_session pointer
1149 tv_nexus
->tvn_se_sess
= transport_init_session();
1150 if (IS_ERR(tv_nexus
->tvn_se_sess
)) {
1151 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1156 * Since we are running in 'demo mode' this call with generate a
1157 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1158 * the SCSI Initiator port name of the passed configfs group 'name'.
1160 tv_nexus
->tvn_se_sess
->se_node_acl
= core_tpg_check_initiator_node_acl(
1161 se_tpg
, (unsigned char *)name
);
1162 if (!tv_nexus
->tvn_se_sess
->se_node_acl
) {
1163 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1164 pr_debug("core_tpg_check_initiator_node_acl() failed"
1166 transport_free_session(tv_nexus
->tvn_se_sess
);
1171 * Now register the TCM vHost virtual I_T Nexus as active with the
1172 * call to __transport_register_session()
1174 __transport_register_session(se_tpg
, tv_nexus
->tvn_se_sess
->se_node_acl
,
1175 tv_nexus
->tvn_se_sess
, tv_nexus
);
1176 tv_tpg
->tpg_nexus
= tv_nexus
;
1178 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1182 static int tcm_vhost_drop_nexus(
1183 struct tcm_vhost_tpg
*tpg
)
1185 struct se_session
*se_sess
;
1186 struct tcm_vhost_nexus
*tv_nexus
;
1188 mutex_lock(&tpg
->tv_tpg_mutex
);
1189 tv_nexus
= tpg
->tpg_nexus
;
1191 mutex_unlock(&tpg
->tv_tpg_mutex
);
1195 se_sess
= tv_nexus
->tvn_se_sess
;
1197 mutex_unlock(&tpg
->tv_tpg_mutex
);
1201 if (atomic_read(&tpg
->tv_tpg_port_count
)) {
1202 mutex_unlock(&tpg
->tv_tpg_mutex
);
1203 pr_err("Unable to remove TCM_vHost I_T Nexus with"
1204 " active TPG port count: %d\n",
1205 atomic_read(&tpg
->tv_tpg_port_count
));
1209 if (atomic_read(&tpg
->tv_tpg_vhost_count
)) {
1210 mutex_unlock(&tpg
->tv_tpg_mutex
);
1211 pr_err("Unable to remove TCM_vHost I_T Nexus with"
1212 " active TPG vhost count: %d\n",
1213 atomic_read(&tpg
->tv_tpg_vhost_count
));
1217 pr_debug("TCM_vHost_ConfigFS: Removing I_T Nexus to emulated"
1218 " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg
->tport
),
1219 tv_nexus
->tvn_se_sess
->se_node_acl
->initiatorname
);
1221 * Release the SCSI I_T Nexus to the emulated vHost Target Port
1223 transport_deregister_session(tv_nexus
->tvn_se_sess
);
1224 tpg
->tpg_nexus
= NULL
;
1225 mutex_unlock(&tpg
->tv_tpg_mutex
);
1231 static ssize_t
tcm_vhost_tpg_show_nexus(
1232 struct se_portal_group
*se_tpg
,
1235 struct tcm_vhost_tpg
*tv_tpg
= container_of(se_tpg
,
1236 struct tcm_vhost_tpg
, se_tpg
);
1237 struct tcm_vhost_nexus
*tv_nexus
;
1240 mutex_lock(&tv_tpg
->tv_tpg_mutex
);
1241 tv_nexus
= tv_tpg
->tpg_nexus
;
1243 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1246 ret
= snprintf(page
, PAGE_SIZE
, "%s\n",
1247 tv_nexus
->tvn_se_sess
->se_node_acl
->initiatorname
);
1248 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1253 static ssize_t
tcm_vhost_tpg_store_nexus(
1254 struct se_portal_group
*se_tpg
,
1258 struct tcm_vhost_tpg
*tv_tpg
= container_of(se_tpg
,
1259 struct tcm_vhost_tpg
, se_tpg
);
1260 struct tcm_vhost_tport
*tport_wwn
= tv_tpg
->tport
;
1261 unsigned char i_port
[TCM_VHOST_NAMELEN
], *ptr
, *port_ptr
;
1264 * Shutdown the active I_T nexus if 'NULL' is passed..
1266 if (!strncmp(page
, "NULL", 4)) {
1267 ret
= tcm_vhost_drop_nexus(tv_tpg
);
1268 return (!ret
) ? count
: ret
;
1271 * Otherwise make sure the passed virtual Initiator port WWN matches
1272 * the fabric protocol_id set in tcm_vhost_make_tport(), and call
1273 * tcm_vhost_make_nexus().
1275 if (strlen(page
) >= TCM_VHOST_NAMELEN
) {
1276 pr_err("Emulated NAA Sas Address: %s, exceeds"
1277 " max: %d\n", page
, TCM_VHOST_NAMELEN
);
1280 snprintf(&i_port
[0], TCM_VHOST_NAMELEN
, "%s", page
);
1282 ptr
= strstr(i_port
, "naa.");
1284 if (tport_wwn
->tport_proto_id
!= SCSI_PROTOCOL_SAS
) {
1285 pr_err("Passed SAS Initiator Port %s does not"
1286 " match target port protoid: %s\n", i_port
,
1287 tcm_vhost_dump_proto_id(tport_wwn
));
1290 port_ptr
= &i_port
[0];
1293 ptr
= strstr(i_port
, "fc.");
1295 if (tport_wwn
->tport_proto_id
!= SCSI_PROTOCOL_FCP
) {
1296 pr_err("Passed FCP Initiator Port %s does not"
1297 " match target port protoid: %s\n", i_port
,
1298 tcm_vhost_dump_proto_id(tport_wwn
));
1301 port_ptr
= &i_port
[3]; /* Skip over "fc." */
1304 ptr
= strstr(i_port
, "iqn.");
1306 if (tport_wwn
->tport_proto_id
!= SCSI_PROTOCOL_ISCSI
) {
1307 pr_err("Passed iSCSI Initiator Port %s does not"
1308 " match target port protoid: %s\n", i_port
,
1309 tcm_vhost_dump_proto_id(tport_wwn
));
1312 port_ptr
= &i_port
[0];
1315 pr_err("Unable to locate prefix for emulated Initiator Port:"
1319 * Clear any trailing newline for the NAA WWN
1322 if (i_port
[strlen(i_port
)-1] == '\n')
1323 i_port
[strlen(i_port
)-1] = '\0';
1325 ret
= tcm_vhost_make_nexus(tv_tpg
, port_ptr
);
1332 TF_TPG_BASE_ATTR(tcm_vhost
, nexus
, S_IRUGO
| S_IWUSR
);
1334 static struct configfs_attribute
*tcm_vhost_tpg_attrs
[] = {
1335 &tcm_vhost_tpg_nexus
.attr
,
1339 static struct se_portal_group
*tcm_vhost_make_tpg(
1341 struct config_group
*group
,
1344 struct tcm_vhost_tport
*tport
= container_of(wwn
,
1345 struct tcm_vhost_tport
, tport_wwn
);
1347 struct tcm_vhost_tpg
*tpg
;
1351 if (strstr(name
, "tpgt_") != name
)
1352 return ERR_PTR(-EINVAL
);
1353 if (kstrtoul(name
+ 5, 10, &tpgt
) || tpgt
> UINT_MAX
)
1354 return ERR_PTR(-EINVAL
);
1356 tpg
= kzalloc(sizeof(struct tcm_vhost_tpg
), GFP_KERNEL
);
1358 pr_err("Unable to allocate struct tcm_vhost_tpg");
1359 return ERR_PTR(-ENOMEM
);
1361 mutex_init(&tpg
->tv_tpg_mutex
);
1362 INIT_LIST_HEAD(&tpg
->tv_tpg_list
);
1364 tpg
->tport_tpgt
= tpgt
;
1366 ret
= core_tpg_register(&tcm_vhost_fabric_configfs
->tf_ops
, wwn
,
1367 &tpg
->se_tpg
, tpg
, TRANSPORT_TPG_TYPE_NORMAL
);
1372 mutex_lock(&tcm_vhost_mutex
);
1373 list_add_tail(&tpg
->tv_tpg_list
, &tcm_vhost_list
);
1374 mutex_unlock(&tcm_vhost_mutex
);
1376 return &tpg
->se_tpg
;
1379 static void tcm_vhost_drop_tpg(struct se_portal_group
*se_tpg
)
1381 struct tcm_vhost_tpg
*tpg
= container_of(se_tpg
,
1382 struct tcm_vhost_tpg
, se_tpg
);
1384 mutex_lock(&tcm_vhost_mutex
);
1385 list_del(&tpg
->tv_tpg_list
);
1386 mutex_unlock(&tcm_vhost_mutex
);
1388 * Release the virtual I_T Nexus for this vHost TPG
1390 tcm_vhost_drop_nexus(tpg
);
1392 * Deregister the se_tpg from TCM..
1394 core_tpg_deregister(se_tpg
);
1398 static struct se_wwn
*tcm_vhost_make_tport(
1399 struct target_fabric_configfs
*tf
,
1400 struct config_group
*group
,
1403 struct tcm_vhost_tport
*tport
;
1408 /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1409 return ERR_PTR(-EINVAL); */
1411 tport
= kzalloc(sizeof(struct tcm_vhost_tport
), GFP_KERNEL
);
1413 pr_err("Unable to allocate struct tcm_vhost_tport");
1414 return ERR_PTR(-ENOMEM
);
1416 tport
->tport_wwpn
= wwpn
;
1418 * Determine the emulated Protocol Identifier and Target Port Name
1419 * based on the incoming configfs directory name.
1421 ptr
= strstr(name
, "naa.");
1423 tport
->tport_proto_id
= SCSI_PROTOCOL_SAS
;
1426 ptr
= strstr(name
, "fc.");
1428 tport
->tport_proto_id
= SCSI_PROTOCOL_FCP
;
1429 off
= 3; /* Skip over "fc." */
1432 ptr
= strstr(name
, "iqn.");
1434 tport
->tport_proto_id
= SCSI_PROTOCOL_ISCSI
;
1438 pr_err("Unable to locate prefix for emulated Target Port:"
1441 return ERR_PTR(-EINVAL
);
1444 if (strlen(name
) >= TCM_VHOST_NAMELEN
) {
1445 pr_err("Emulated %s Address: %s, exceeds"
1446 " max: %d\n", name
, tcm_vhost_dump_proto_id(tport
),
1449 return ERR_PTR(-EINVAL
);
1451 snprintf(&tport
->tport_name
[0], TCM_VHOST_NAMELEN
, "%s", &name
[off
]);
1453 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
1454 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport
), name
);
1456 return &tport
->tport_wwn
;
1459 static void tcm_vhost_drop_tport(struct se_wwn
*wwn
)
1461 struct tcm_vhost_tport
*tport
= container_of(wwn
,
1462 struct tcm_vhost_tport
, tport_wwn
);
1464 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
1465 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport
),
1471 static ssize_t
tcm_vhost_wwn_show_attr_version(
1472 struct target_fabric_configfs
*tf
,
1475 return sprintf(page
, "TCM_VHOST fabric module %s on %s/%s"
1476 "on "UTS_RELEASE
"\n", TCM_VHOST_VERSION
, utsname()->sysname
,
1477 utsname()->machine
);
1480 TF_WWN_ATTR_RO(tcm_vhost
, version
);
1482 static struct configfs_attribute
*tcm_vhost_wwn_attrs
[] = {
1483 &tcm_vhost_wwn_version
.attr
,
1487 static struct target_core_fabric_ops tcm_vhost_ops
= {
1488 .get_fabric_name
= tcm_vhost_get_fabric_name
,
1489 .get_fabric_proto_ident
= tcm_vhost_get_fabric_proto_ident
,
1490 .tpg_get_wwn
= tcm_vhost_get_fabric_wwn
,
1491 .tpg_get_tag
= tcm_vhost_get_tag
,
1492 .tpg_get_default_depth
= tcm_vhost_get_default_depth
,
1493 .tpg_get_pr_transport_id
= tcm_vhost_get_pr_transport_id
,
1494 .tpg_get_pr_transport_id_len
= tcm_vhost_get_pr_transport_id_len
,
1495 .tpg_parse_pr_out_transport_id
= tcm_vhost_parse_pr_out_transport_id
,
1496 .tpg_check_demo_mode
= tcm_vhost_check_true
,
1497 .tpg_check_demo_mode_cache
= tcm_vhost_check_true
,
1498 .tpg_check_demo_mode_write_protect
= tcm_vhost_check_false
,
1499 .tpg_check_prod_mode_write_protect
= tcm_vhost_check_false
,
1500 .tpg_alloc_fabric_acl
= tcm_vhost_alloc_fabric_acl
,
1501 .tpg_release_fabric_acl
= tcm_vhost_release_fabric_acl
,
1502 .tpg_get_inst_index
= tcm_vhost_tpg_get_inst_index
,
1503 .release_cmd
= tcm_vhost_release_cmd
,
1504 .shutdown_session
= tcm_vhost_shutdown_session
,
1505 .close_session
= tcm_vhost_close_session
,
1506 .sess_get_index
= tcm_vhost_sess_get_index
,
1507 .sess_get_initiator_sid
= NULL
,
1508 .write_pending
= tcm_vhost_write_pending
,
1509 .write_pending_status
= tcm_vhost_write_pending_status
,
1510 .set_default_node_attributes
= tcm_vhost_set_default_node_attrs
,
1511 .get_task_tag
= tcm_vhost_get_task_tag
,
1512 .get_cmd_state
= tcm_vhost_get_cmd_state
,
1513 .queue_data_in
= tcm_vhost_queue_data_in
,
1514 .queue_status
= tcm_vhost_queue_status
,
1515 .queue_tm_rsp
= tcm_vhost_queue_tm_rsp
,
1516 .get_fabric_sense_len
= tcm_vhost_get_fabric_sense_len
,
1517 .set_fabric_sense_len
= tcm_vhost_set_fabric_sense_len
,
1519 * Setup callers for generic logic in target_core_fabric_configfs.c
1521 .fabric_make_wwn
= tcm_vhost_make_tport
,
1522 .fabric_drop_wwn
= tcm_vhost_drop_tport
,
1523 .fabric_make_tpg
= tcm_vhost_make_tpg
,
1524 .fabric_drop_tpg
= tcm_vhost_drop_tpg
,
1525 .fabric_post_link
= tcm_vhost_port_link
,
1526 .fabric_pre_unlink
= tcm_vhost_port_unlink
,
1527 .fabric_make_np
= NULL
,
1528 .fabric_drop_np
= NULL
,
1529 .fabric_make_nodeacl
= tcm_vhost_make_nodeacl
,
1530 .fabric_drop_nodeacl
= tcm_vhost_drop_nodeacl
,
1533 static int tcm_vhost_register_configfs(void)
1535 struct target_fabric_configfs
*fabric
;
1538 pr_debug("TCM_VHOST fabric module %s on %s/%s"
1539 " on "UTS_RELEASE
"\n", TCM_VHOST_VERSION
, utsname()->sysname
,
1540 utsname()->machine
);
1542 * Register the top level struct config_item_type with TCM core
1544 fabric
= target_fabric_configfs_init(THIS_MODULE
, "vhost");
1545 if (IS_ERR(fabric
)) {
1546 pr_err("target_fabric_configfs_init() failed\n");
1547 return PTR_ERR(fabric
);
1550 * Setup fabric->tf_ops from our local tcm_vhost_ops
1552 fabric
->tf_ops
= tcm_vhost_ops
;
1554 * Setup default attribute lists for various fabric->tf_cit_tmpl
1556 TF_CIT_TMPL(fabric
)->tfc_wwn_cit
.ct_attrs
= tcm_vhost_wwn_attrs
;
1557 TF_CIT_TMPL(fabric
)->tfc_tpg_base_cit
.ct_attrs
= tcm_vhost_tpg_attrs
;
1558 TF_CIT_TMPL(fabric
)->tfc_tpg_attrib_cit
.ct_attrs
= NULL
;
1559 TF_CIT_TMPL(fabric
)->tfc_tpg_param_cit
.ct_attrs
= NULL
;
1560 TF_CIT_TMPL(fabric
)->tfc_tpg_np_base_cit
.ct_attrs
= NULL
;
1561 TF_CIT_TMPL(fabric
)->tfc_tpg_nacl_base_cit
.ct_attrs
= NULL
;
1562 TF_CIT_TMPL(fabric
)->tfc_tpg_nacl_attrib_cit
.ct_attrs
= NULL
;
1563 TF_CIT_TMPL(fabric
)->tfc_tpg_nacl_auth_cit
.ct_attrs
= NULL
;
1564 TF_CIT_TMPL(fabric
)->tfc_tpg_nacl_param_cit
.ct_attrs
= NULL
;
1566 * Register the fabric for use within TCM
1568 ret
= target_fabric_configfs_register(fabric
);
1570 pr_err("target_fabric_configfs_register() failed"
1571 " for TCM_VHOST\n");
1575 * Setup our local pointer to *fabric
1577 tcm_vhost_fabric_configfs
= fabric
;
1578 pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n");
1582 static void tcm_vhost_deregister_configfs(void)
1584 if (!tcm_vhost_fabric_configfs
)
1587 target_fabric_configfs_deregister(tcm_vhost_fabric_configfs
);
1588 tcm_vhost_fabric_configfs
= NULL
;
1589 pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n");
1592 static int __init
tcm_vhost_init(void)
1596 tcm_vhost_workqueue
= alloc_workqueue("tcm_vhost", 0, 0);
1597 if (!tcm_vhost_workqueue
)
1600 ret
= vhost_scsi_register();
1602 goto out_destroy_workqueue
;
1604 ret
= tcm_vhost_register_configfs();
1606 goto out_vhost_scsi_deregister
;
1610 out_vhost_scsi_deregister
:
1611 vhost_scsi_deregister();
1612 out_destroy_workqueue
:
1613 destroy_workqueue(tcm_vhost_workqueue
);
1618 static void tcm_vhost_exit(void)
1620 tcm_vhost_deregister_configfs();
1621 vhost_scsi_deregister();
1622 destroy_workqueue(tcm_vhost_workqueue
);
1625 MODULE_DESCRIPTION("TCM_VHOST series fabric driver");
1626 MODULE_LICENSE("GPL");
1627 module_init(tcm_vhost_init
);
1628 module_exit(tcm_vhost_exit
);