1 /*******************************************************************************
2 * Vhost kernel TCM fabric driver for virtio SCSI initiators
4 * (C) Copyright 2010-2013 Datera, Inc.
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@daterainc.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>
38 #include <linux/vmalloc.h>
39 #include <linux/miscdevice.h>
40 #include <asm/unaligned.h>
41 #include <scsi/scsi_common.h>
42 #include <scsi/scsi_proto.h>
43 #include <target/target_core_base.h>
44 #include <target/target_core_fabric.h>
45 #include <linux/vhost.h>
46 #include <linux/virtio_scsi.h>
47 #include <linux/llist.h>
48 #include <linux/bitmap.h>
49 #include <linux/percpu_ida.h>
53 #define VHOST_SCSI_VERSION "v0.1"
54 #define VHOST_SCSI_NAMELEN 256
55 #define VHOST_SCSI_MAX_CDB_SIZE 32
56 #define VHOST_SCSI_DEFAULT_TAGS 256
57 #define VHOST_SCSI_PREALLOC_SGLS 2048
58 #define VHOST_SCSI_PREALLOC_UPAGES 2048
59 #define VHOST_SCSI_PREALLOC_PROT_SGLS 512
61 struct vhost_scsi_inflight
{
62 /* Wait for the flush operation to finish */
63 struct completion comp
;
64 /* Refcount for the inflight reqs */
68 struct vhost_scsi_cmd
{
69 /* Descriptor from vhost_get_vq_desc() for virt_queue segment */
71 /* virtio-scsi initiator task attribute */
73 /* virtio-scsi response incoming iovecs */
75 /* virtio-scsi initiator data direction */
76 enum dma_data_direction tvc_data_direction
;
77 /* Expected data transfer length from virtio-scsi header */
79 /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
81 /* The number of scatterlists associated with this cmd */
83 u32 tvc_prot_sgl_count
;
84 /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */
86 /* Pointer to the SGL formatted memory from virtio-scsi */
87 struct scatterlist
*tvc_sgl
;
88 struct scatterlist
*tvc_prot_sgl
;
89 struct page
**tvc_upages
;
90 /* Pointer to response header iovec */
91 struct iovec tvc_resp_iov
;
92 /* Pointer to vhost_scsi for our device */
93 struct vhost_scsi
*tvc_vhost
;
94 /* Pointer to vhost_virtqueue for the cmd */
95 struct vhost_virtqueue
*tvc_vq
;
96 /* Pointer to vhost nexus memory */
97 struct vhost_scsi_nexus
*tvc_nexus
;
98 /* The TCM I/O descriptor that is accessed via container_of() */
99 struct se_cmd tvc_se_cmd
;
100 /* work item used for cmwq dispatch to vhost_scsi_submission_work() */
101 struct work_struct work
;
102 /* Copy of the incoming SCSI command descriptor block (CDB) */
103 unsigned char tvc_cdb
[VHOST_SCSI_MAX_CDB_SIZE
];
104 /* Sense buffer that will be mapped into outgoing status */
105 unsigned char tvc_sense_buf
[TRANSPORT_SENSE_BUFFER
];
106 /* Completed commands list, serviced from vhost worker thread */
107 struct llist_node tvc_completion_list
;
108 /* Used to track inflight cmd */
109 struct vhost_scsi_inflight
*inflight
;
112 struct vhost_scsi_nexus
{
113 /* Pointer to TCM session for I_T Nexus */
114 struct se_session
*tvn_se_sess
;
117 struct vhost_scsi_tpg
{
118 /* Vhost port target portal group tag for TCM */
120 /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
121 int tv_tpg_port_count
;
122 /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
123 int tv_tpg_vhost_count
;
124 /* Used for enabling T10-PI with legacy devices */
125 int tv_fabric_prot_type
;
126 /* list for vhost_scsi_list */
127 struct list_head tv_tpg_list
;
128 /* Used to protect access for tpg_nexus */
129 struct mutex tv_tpg_mutex
;
130 /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
131 struct vhost_scsi_nexus
*tpg_nexus
;
132 /* Pointer back to vhost_scsi_tport */
133 struct vhost_scsi_tport
*tport
;
134 /* Returned by vhost_scsi_make_tpg() */
135 struct se_portal_group se_tpg
;
136 /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */
137 struct vhost_scsi
*vhost_scsi
;
140 struct vhost_scsi_tport
{
141 /* SCSI protocol the tport is providing */
143 /* Binary World Wide unique Port Name for Vhost Target port */
145 /* ASCII formatted WWPN for Vhost Target port */
146 char tport_name
[VHOST_SCSI_NAMELEN
];
147 /* Returned by vhost_scsi_make_tport() */
148 struct se_wwn tport_wwn
;
151 struct vhost_scsi_evt
{
152 /* event to be sent to guest */
153 struct virtio_scsi_event event
;
154 /* event list, serviced from vhost worker thread */
155 struct llist_node list
;
159 VHOST_SCSI_VQ_CTL
= 0,
160 VHOST_SCSI_VQ_EVT
= 1,
161 VHOST_SCSI_VQ_IO
= 2,
164 /* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */
166 VHOST_SCSI_FEATURES
= VHOST_FEATURES
| (1ULL << VIRTIO_SCSI_F_HOTPLUG
) |
167 (1ULL << VIRTIO_SCSI_F_T10_PI
)
170 #define VHOST_SCSI_MAX_TARGET 256
171 #define VHOST_SCSI_MAX_VQ 128
172 #define VHOST_SCSI_MAX_EVENT 128
174 struct vhost_scsi_virtqueue
{
175 struct vhost_virtqueue vq
;
177 * Reference counting for inflight reqs, used for flush operation. At
178 * each time, one reference tracks new commands submitted, while we
179 * wait for another one to reach 0.
181 struct vhost_scsi_inflight inflights
[2];
183 * Indicate current inflight in use, protected by vq->mutex.
184 * Writers must also take dev mutex and flush under it.
190 /* Protected by vhost_scsi->dev.mutex */
191 struct vhost_scsi_tpg
**vs_tpg
;
192 char vs_vhost_wwpn
[TRANSPORT_IQN_LEN
];
194 struct vhost_dev dev
;
195 struct vhost_scsi_virtqueue vqs
[VHOST_SCSI_MAX_VQ
];
197 struct vhost_work vs_completion_work
; /* cmd completion work item */
198 struct llist_head vs_completion_list
; /* cmd completion queue */
200 struct vhost_work vs_event_work
; /* evt injection work item */
201 struct llist_head vs_event_list
; /* evt injection queue */
203 bool vs_events_missed
; /* any missed events, protected by vq->mutex */
204 int vs_events_nr
; /* num of pending events, protected by vq->mutex */
207 static struct workqueue_struct
*vhost_scsi_workqueue
;
209 /* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */
210 static DEFINE_MUTEX(vhost_scsi_mutex
);
211 static LIST_HEAD(vhost_scsi_list
);
213 static void vhost_scsi_done_inflight(struct kref
*kref
)
215 struct vhost_scsi_inflight
*inflight
;
217 inflight
= container_of(kref
, struct vhost_scsi_inflight
, kref
);
218 complete(&inflight
->comp
);
221 static void vhost_scsi_init_inflight(struct vhost_scsi
*vs
,
222 struct vhost_scsi_inflight
*old_inflight
[])
224 struct vhost_scsi_inflight
*new_inflight
;
225 struct vhost_virtqueue
*vq
;
228 for (i
= 0; i
< VHOST_SCSI_MAX_VQ
; i
++) {
231 mutex_lock(&vq
->mutex
);
233 /* store old infight */
234 idx
= vs
->vqs
[i
].inflight_idx
;
236 old_inflight
[i
] = &vs
->vqs
[i
].inflights
[idx
];
238 /* setup new infight */
239 vs
->vqs
[i
].inflight_idx
= idx
^ 1;
240 new_inflight
= &vs
->vqs
[i
].inflights
[idx
^ 1];
241 kref_init(&new_inflight
->kref
);
242 init_completion(&new_inflight
->comp
);
244 mutex_unlock(&vq
->mutex
);
248 static struct vhost_scsi_inflight
*
249 vhost_scsi_get_inflight(struct vhost_virtqueue
*vq
)
251 struct vhost_scsi_inflight
*inflight
;
252 struct vhost_scsi_virtqueue
*svq
;
254 svq
= container_of(vq
, struct vhost_scsi_virtqueue
, vq
);
255 inflight
= &svq
->inflights
[svq
->inflight_idx
];
256 kref_get(&inflight
->kref
);
261 static void vhost_scsi_put_inflight(struct vhost_scsi_inflight
*inflight
)
263 kref_put(&inflight
->kref
, vhost_scsi_done_inflight
);
266 static int vhost_scsi_check_true(struct se_portal_group
*se_tpg
)
271 static int vhost_scsi_check_false(struct se_portal_group
*se_tpg
)
276 static char *vhost_scsi_get_fabric_name(void)
281 static char *vhost_scsi_get_fabric_wwn(struct se_portal_group
*se_tpg
)
283 struct vhost_scsi_tpg
*tpg
= container_of(se_tpg
,
284 struct vhost_scsi_tpg
, se_tpg
);
285 struct vhost_scsi_tport
*tport
= tpg
->tport
;
287 return &tport
->tport_name
[0];
290 static u16
vhost_scsi_get_tpgt(struct se_portal_group
*se_tpg
)
292 struct vhost_scsi_tpg
*tpg
= container_of(se_tpg
,
293 struct vhost_scsi_tpg
, se_tpg
);
294 return tpg
->tport_tpgt
;
297 static int vhost_scsi_check_prot_fabric_only(struct se_portal_group
*se_tpg
)
299 struct vhost_scsi_tpg
*tpg
= container_of(se_tpg
,
300 struct vhost_scsi_tpg
, se_tpg
);
302 return tpg
->tv_fabric_prot_type
;
305 static u32
vhost_scsi_tpg_get_inst_index(struct se_portal_group
*se_tpg
)
310 static void vhost_scsi_release_cmd(struct se_cmd
*se_cmd
)
312 struct vhost_scsi_cmd
*tv_cmd
= container_of(se_cmd
,
313 struct vhost_scsi_cmd
, tvc_se_cmd
);
314 struct se_session
*se_sess
= tv_cmd
->tvc_nexus
->tvn_se_sess
;
317 if (tv_cmd
->tvc_sgl_count
) {
318 for (i
= 0; i
< tv_cmd
->tvc_sgl_count
; i
++)
319 put_page(sg_page(&tv_cmd
->tvc_sgl
[i
]));
321 if (tv_cmd
->tvc_prot_sgl_count
) {
322 for (i
= 0; i
< tv_cmd
->tvc_prot_sgl_count
; i
++)
323 put_page(sg_page(&tv_cmd
->tvc_prot_sgl
[i
]));
326 vhost_scsi_put_inflight(tv_cmd
->inflight
);
327 percpu_ida_free(&se_sess
->sess_tag_pool
, se_cmd
->map_tag
);
330 static u32
vhost_scsi_sess_get_index(struct se_session
*se_sess
)
335 static int vhost_scsi_write_pending(struct se_cmd
*se_cmd
)
337 /* Go ahead and process the write immediately */
338 target_execute_cmd(se_cmd
);
342 static int vhost_scsi_write_pending_status(struct se_cmd
*se_cmd
)
347 static void vhost_scsi_set_default_node_attrs(struct se_node_acl
*nacl
)
352 static int vhost_scsi_get_cmd_state(struct se_cmd
*se_cmd
)
357 static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd
*cmd
)
359 struct vhost_scsi
*vs
= cmd
->tvc_vhost
;
361 llist_add(&cmd
->tvc_completion_list
, &vs
->vs_completion_list
);
363 vhost_work_queue(&vs
->dev
, &vs
->vs_completion_work
);
366 static int vhost_scsi_queue_data_in(struct se_cmd
*se_cmd
)
368 struct vhost_scsi_cmd
*cmd
= container_of(se_cmd
,
369 struct vhost_scsi_cmd
, tvc_se_cmd
);
370 vhost_scsi_complete_cmd(cmd
);
374 static int vhost_scsi_queue_status(struct se_cmd
*se_cmd
)
376 struct vhost_scsi_cmd
*cmd
= container_of(se_cmd
,
377 struct vhost_scsi_cmd
, tvc_se_cmd
);
378 vhost_scsi_complete_cmd(cmd
);
382 static void vhost_scsi_queue_tm_rsp(struct se_cmd
*se_cmd
)
387 static void vhost_scsi_aborted_task(struct se_cmd
*se_cmd
)
392 static void vhost_scsi_free_evt(struct vhost_scsi
*vs
, struct vhost_scsi_evt
*evt
)
398 static struct vhost_scsi_evt
*
399 vhost_scsi_allocate_evt(struct vhost_scsi
*vs
,
400 u32 event
, u32 reason
)
402 struct vhost_virtqueue
*vq
= &vs
->vqs
[VHOST_SCSI_VQ_EVT
].vq
;
403 struct vhost_scsi_evt
*evt
;
405 if (vs
->vs_events_nr
> VHOST_SCSI_MAX_EVENT
) {
406 vs
->vs_events_missed
= true;
410 evt
= kzalloc(sizeof(*evt
), GFP_KERNEL
);
412 vq_err(vq
, "Failed to allocate vhost_scsi_evt\n");
413 vs
->vs_events_missed
= true;
417 evt
->event
.event
= cpu_to_vhost32(vq
, event
);
418 evt
->event
.reason
= cpu_to_vhost32(vq
, reason
);
424 static void vhost_scsi_free_cmd(struct vhost_scsi_cmd
*cmd
)
426 struct se_cmd
*se_cmd
= &cmd
->tvc_se_cmd
;
428 /* TODO locking against target/backend threads? */
429 transport_generic_free_cmd(se_cmd
, 0);
433 static int vhost_scsi_check_stop_free(struct se_cmd
*se_cmd
)
435 return target_put_sess_cmd(se_cmd
);
439 vhost_scsi_do_evt_work(struct vhost_scsi
*vs
, struct vhost_scsi_evt
*evt
)
441 struct vhost_virtqueue
*vq
= &vs
->vqs
[VHOST_SCSI_VQ_EVT
].vq
;
442 struct virtio_scsi_event
*event
= &evt
->event
;
443 struct virtio_scsi_event __user
*eventp
;
447 if (!vq
->private_data
) {
448 vs
->vs_events_missed
= true;
453 vhost_disable_notify(&vs
->dev
, vq
);
454 head
= vhost_get_vq_desc(vq
, vq
->iov
,
455 ARRAY_SIZE(vq
->iov
), &out
, &in
,
458 vs
->vs_events_missed
= true;
461 if (head
== vq
->num
) {
462 if (vhost_enable_notify(&vs
->dev
, vq
))
464 vs
->vs_events_missed
= true;
468 if ((vq
->iov
[out
].iov_len
!= sizeof(struct virtio_scsi_event
))) {
469 vq_err(vq
, "Expecting virtio_scsi_event, got %zu bytes\n",
470 vq
->iov
[out
].iov_len
);
471 vs
->vs_events_missed
= true;
475 if (vs
->vs_events_missed
) {
476 event
->event
|= cpu_to_vhost32(vq
, VIRTIO_SCSI_T_EVENTS_MISSED
);
477 vs
->vs_events_missed
= false;
480 eventp
= vq
->iov
[out
].iov_base
;
481 ret
= __copy_to_user(eventp
, event
, sizeof(*event
));
483 vhost_add_used_and_signal(&vs
->dev
, vq
, head
, 0);
485 vq_err(vq
, "Faulted on vhost_scsi_send_event\n");
488 static void vhost_scsi_evt_work(struct vhost_work
*work
)
490 struct vhost_scsi
*vs
= container_of(work
, struct vhost_scsi
,
492 struct vhost_virtqueue
*vq
= &vs
->vqs
[VHOST_SCSI_VQ_EVT
].vq
;
493 struct vhost_scsi_evt
*evt
, *t
;
494 struct llist_node
*llnode
;
496 mutex_lock(&vq
->mutex
);
497 llnode
= llist_del_all(&vs
->vs_event_list
);
498 llist_for_each_entry_safe(evt
, t
, llnode
, list
) {
499 vhost_scsi_do_evt_work(vs
, evt
);
500 vhost_scsi_free_evt(vs
, evt
);
502 mutex_unlock(&vq
->mutex
);
505 /* Fill in status and signal that we are done processing this command
507 * This is scheduled in the vhost work queue so we are called with the owner
508 * process mm and can access the vring.
510 static void vhost_scsi_complete_cmd_work(struct vhost_work
*work
)
512 struct vhost_scsi
*vs
= container_of(work
, struct vhost_scsi
,
514 DECLARE_BITMAP(signal
, VHOST_SCSI_MAX_VQ
);
515 struct virtio_scsi_cmd_resp v_rsp
;
516 struct vhost_scsi_cmd
*cmd
, *t
;
517 struct llist_node
*llnode
;
518 struct se_cmd
*se_cmd
;
519 struct iov_iter iov_iter
;
522 bitmap_zero(signal
, VHOST_SCSI_MAX_VQ
);
523 llnode
= llist_del_all(&vs
->vs_completion_list
);
524 llist_for_each_entry_safe(cmd
, t
, llnode
, tvc_completion_list
) {
525 se_cmd
= &cmd
->tvc_se_cmd
;
527 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__
,
528 cmd
, se_cmd
->residual_count
, se_cmd
->scsi_status
);
530 memset(&v_rsp
, 0, sizeof(v_rsp
));
531 v_rsp
.resid
= cpu_to_vhost32(cmd
->tvc_vq
, se_cmd
->residual_count
);
532 /* TODO is status_qualifier field needed? */
533 v_rsp
.status
= se_cmd
->scsi_status
;
534 v_rsp
.sense_len
= cpu_to_vhost32(cmd
->tvc_vq
,
535 se_cmd
->scsi_sense_length
);
536 memcpy(v_rsp
.sense
, cmd
->tvc_sense_buf
,
537 se_cmd
->scsi_sense_length
);
539 iov_iter_init(&iov_iter
, READ
, &cmd
->tvc_resp_iov
,
540 cmd
->tvc_in_iovs
, sizeof(v_rsp
));
541 ret
= copy_to_iter(&v_rsp
, sizeof(v_rsp
), &iov_iter
);
542 if (likely(ret
== sizeof(v_rsp
))) {
543 struct vhost_scsi_virtqueue
*q
;
544 vhost_add_used(cmd
->tvc_vq
, cmd
->tvc_vq_desc
, 0);
545 q
= container_of(cmd
->tvc_vq
, struct vhost_scsi_virtqueue
, vq
);
547 __set_bit(vq
, signal
);
549 pr_err("Faulted on virtio_scsi_cmd_resp\n");
551 vhost_scsi_free_cmd(cmd
);
555 while ((vq
= find_next_bit(signal
, VHOST_SCSI_MAX_VQ
, vq
+ 1))
557 vhost_signal(&vs
->dev
, &vs
->vqs
[vq
].vq
);
560 static struct vhost_scsi_cmd
*
561 vhost_scsi_get_tag(struct vhost_virtqueue
*vq
, struct vhost_scsi_tpg
*tpg
,
562 unsigned char *cdb
, u64 scsi_tag
, u16 lun
, u8 task_attr
,
563 u32 exp_data_len
, int data_direction
)
565 struct vhost_scsi_cmd
*cmd
;
566 struct vhost_scsi_nexus
*tv_nexus
;
567 struct se_session
*se_sess
;
568 struct scatterlist
*sg
, *prot_sg
;
572 tv_nexus
= tpg
->tpg_nexus
;
574 pr_err("Unable to locate active struct vhost_scsi_nexus\n");
575 return ERR_PTR(-EIO
);
577 se_sess
= tv_nexus
->tvn_se_sess
;
579 tag
= percpu_ida_alloc(&se_sess
->sess_tag_pool
, TASK_RUNNING
);
581 pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
582 return ERR_PTR(-ENOMEM
);
585 cmd
= &((struct vhost_scsi_cmd
*)se_sess
->sess_cmd_map
)[tag
];
587 prot_sg
= cmd
->tvc_prot_sgl
;
588 pages
= cmd
->tvc_upages
;
589 memset(cmd
, 0, sizeof(struct vhost_scsi_cmd
));
592 cmd
->tvc_prot_sgl
= prot_sg
;
593 cmd
->tvc_upages
= pages
;
594 cmd
->tvc_se_cmd
.map_tag
= tag
;
595 cmd
->tvc_tag
= scsi_tag
;
597 cmd
->tvc_task_attr
= task_attr
;
598 cmd
->tvc_exp_data_len
= exp_data_len
;
599 cmd
->tvc_data_direction
= data_direction
;
600 cmd
->tvc_nexus
= tv_nexus
;
601 cmd
->inflight
= vhost_scsi_get_inflight(vq
);
603 memcpy(cmd
->tvc_cdb
, cdb
, VHOST_SCSI_MAX_CDB_SIZE
);
609 * Map a user memory range into a scatterlist
611 * Returns the number of scatterlist entries used or -errno on error.
614 vhost_scsi_map_to_sgl(struct vhost_scsi_cmd
*cmd
,
615 struct iov_iter
*iter
,
616 struct scatterlist
*sgl
,
619 struct page
**pages
= cmd
->tvc_upages
;
620 struct scatterlist
*sg
= sgl
;
623 unsigned int npages
= 0;
625 bytes
= iov_iter_get_pages(iter
, pages
, LONG_MAX
,
626 VHOST_SCSI_PREALLOC_UPAGES
, &offset
);
627 /* No pages were pinned */
629 return bytes
< 0 ? bytes
: -EFAULT
;
631 iov_iter_advance(iter
, bytes
);
634 unsigned n
= min_t(unsigned, PAGE_SIZE
- offset
, bytes
);
635 sg_set_page(sg
++, pages
[npages
++], n
, offset
);
643 vhost_scsi_calc_sgls(struct iov_iter
*iter
, size_t bytes
, int max_sgls
)
647 if (!iter
|| !iter
->iov
) {
648 pr_err("%s: iter->iov is NULL, but expected bytes: %zu"
649 " present\n", __func__
, bytes
);
653 sgl_count
= iov_iter_npages(iter
, 0xffff);
654 if (sgl_count
> max_sgls
) {
655 pr_err("%s: requested sgl_count: %d exceeds pre-allocated"
656 " max_sgls: %d\n", __func__
, sgl_count
, max_sgls
);
663 vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd
*cmd
, bool write
,
664 struct iov_iter
*iter
,
665 struct scatterlist
*sg
, int sg_count
)
667 struct scatterlist
*p
= sg
;
670 while (iov_iter_count(iter
)) {
671 ret
= vhost_scsi_map_to_sgl(cmd
, iter
, sg
, write
);
674 struct page
*page
= sg_page(p
++);
686 vhost_scsi_mapal(struct vhost_scsi_cmd
*cmd
,
687 size_t prot_bytes
, struct iov_iter
*prot_iter
,
688 size_t data_bytes
, struct iov_iter
*data_iter
)
691 bool write
= (cmd
->tvc_data_direction
== DMA_FROM_DEVICE
);
694 sgl_count
= vhost_scsi_calc_sgls(prot_iter
, prot_bytes
,
695 VHOST_SCSI_PREALLOC_PROT_SGLS
);
699 sg_init_table(cmd
->tvc_prot_sgl
, sgl_count
);
700 cmd
->tvc_prot_sgl_count
= sgl_count
;
701 pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__
,
702 cmd
->tvc_prot_sgl
, cmd
->tvc_prot_sgl_count
);
704 ret
= vhost_scsi_iov_to_sgl(cmd
, write
, prot_iter
,
706 cmd
->tvc_prot_sgl_count
);
708 cmd
->tvc_prot_sgl_count
= 0;
712 sgl_count
= vhost_scsi_calc_sgls(data_iter
, data_bytes
,
713 VHOST_SCSI_PREALLOC_SGLS
);
717 sg_init_table(cmd
->tvc_sgl
, sgl_count
);
718 cmd
->tvc_sgl_count
= sgl_count
;
719 pr_debug("%s data_sg %p data_sgl_count %u\n", __func__
,
720 cmd
->tvc_sgl
, cmd
->tvc_sgl_count
);
722 ret
= vhost_scsi_iov_to_sgl(cmd
, write
, data_iter
,
723 cmd
->tvc_sgl
, cmd
->tvc_sgl_count
);
725 cmd
->tvc_sgl_count
= 0;
731 static int vhost_scsi_to_tcm_attr(int attr
)
734 case VIRTIO_SCSI_S_SIMPLE
:
735 return TCM_SIMPLE_TAG
;
736 case VIRTIO_SCSI_S_ORDERED
:
737 return TCM_ORDERED_TAG
;
738 case VIRTIO_SCSI_S_HEAD
:
740 case VIRTIO_SCSI_S_ACA
:
745 return TCM_SIMPLE_TAG
;
748 static void vhost_scsi_submission_work(struct work_struct
*work
)
750 struct vhost_scsi_cmd
*cmd
=
751 container_of(work
, struct vhost_scsi_cmd
, work
);
752 struct vhost_scsi_nexus
*tv_nexus
;
753 struct se_cmd
*se_cmd
= &cmd
->tvc_se_cmd
;
754 struct scatterlist
*sg_ptr
, *sg_prot_ptr
= NULL
;
757 /* FIXME: BIDI operation */
758 if (cmd
->tvc_sgl_count
) {
759 sg_ptr
= cmd
->tvc_sgl
;
761 if (cmd
->tvc_prot_sgl_count
)
762 sg_prot_ptr
= cmd
->tvc_prot_sgl
;
764 se_cmd
->prot_pto
= true;
768 tv_nexus
= cmd
->tvc_nexus
;
771 rc
= target_submit_cmd_map_sgls(se_cmd
, tv_nexus
->tvn_se_sess
,
772 cmd
->tvc_cdb
, &cmd
->tvc_sense_buf
[0],
773 cmd
->tvc_lun
, cmd
->tvc_exp_data_len
,
774 vhost_scsi_to_tcm_attr(cmd
->tvc_task_attr
),
775 cmd
->tvc_data_direction
, TARGET_SCF_ACK_KREF
,
776 sg_ptr
, cmd
->tvc_sgl_count
, NULL
, 0, sg_prot_ptr
,
777 cmd
->tvc_prot_sgl_count
);
779 transport_send_check_condition_and_sense(se_cmd
,
780 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
, 0);
781 transport_generic_free_cmd(se_cmd
, 0);
786 vhost_scsi_send_bad_target(struct vhost_scsi
*vs
,
787 struct vhost_virtqueue
*vq
,
788 int head
, unsigned out
)
790 struct virtio_scsi_cmd_resp __user
*resp
;
791 struct virtio_scsi_cmd_resp rsp
;
794 memset(&rsp
, 0, sizeof(rsp
));
795 rsp
.response
= VIRTIO_SCSI_S_BAD_TARGET
;
796 resp
= vq
->iov
[out
].iov_base
;
797 ret
= __copy_to_user(resp
, &rsp
, sizeof(rsp
));
799 vhost_add_used_and_signal(&vs
->dev
, vq
, head
, 0);
801 pr_err("Faulted on virtio_scsi_cmd_resp\n");
805 vhost_scsi_handle_vq(struct vhost_scsi
*vs
, struct vhost_virtqueue
*vq
)
807 struct vhost_scsi_tpg
**vs_tpg
, *tpg
;
808 struct virtio_scsi_cmd_req v_req
;
809 struct virtio_scsi_cmd_req_pi v_req_pi
;
810 struct vhost_scsi_cmd
*cmd
;
811 struct iov_iter out_iter
, in_iter
, prot_iter
, data_iter
;
813 u32 exp_data_len
, data_direction
;
814 unsigned int out
= 0, in
= 0;
815 int head
, ret
, prot_bytes
;
816 size_t req_size
, rsp_size
= sizeof(struct virtio_scsi_cmd_resp
);
817 size_t out_size
, in_size
;
819 u8
*target
, *lunp
, task_attr
;
820 bool t10_pi
= vhost_has_feature(vq
, VIRTIO_SCSI_F_T10_PI
);
823 mutex_lock(&vq
->mutex
);
825 * We can handle the vq only after the endpoint is setup by calling the
826 * VHOST_SCSI_SET_ENDPOINT ioctl.
828 vs_tpg
= vq
->private_data
;
832 vhost_disable_notify(&vs
->dev
, vq
);
835 head
= vhost_get_vq_desc(vq
, vq
->iov
,
836 ARRAY_SIZE(vq
->iov
), &out
, &in
,
838 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
840 /* On error, stop handling until the next kick. */
841 if (unlikely(head
< 0))
843 /* Nothing new? Wait for eventfd to tell us they refilled. */
844 if (head
== vq
->num
) {
845 if (unlikely(vhost_enable_notify(&vs
->dev
, vq
))) {
846 vhost_disable_notify(&vs
->dev
, vq
);
852 * Check for a sane response buffer so we can report early
853 * errors back to the guest.
855 if (unlikely(vq
->iov
[out
].iov_len
< rsp_size
)) {
856 vq_err(vq
, "Expecting at least virtio_scsi_cmd_resp"
857 " size, got %zu bytes\n", vq
->iov
[out
].iov_len
);
861 * Setup pointers and values based upon different virtio-scsi
862 * request header if T10_PI is enabled in KVM guest.
866 req_size
= sizeof(v_req_pi
);
867 lunp
= &v_req_pi
.lun
[0];
868 target
= &v_req_pi
.lun
[1];
871 req_size
= sizeof(v_req
);
872 lunp
= &v_req
.lun
[0];
873 target
= &v_req
.lun
[1];
876 * FIXME: Not correct for BIDI operation
878 out_size
= iov_length(vq
->iov
, out
);
879 in_size
= iov_length(&vq
->iov
[out
], in
);
882 * Copy over the virtio-scsi request header, which for a
883 * ANY_LAYOUT enabled guest may span multiple iovecs, or a
884 * single iovec may contain both the header + outgoing
887 * copy_from_iter() will advance out_iter, so that it will
888 * point at the start of the outgoing WRITE payload, if
889 * DMA_TO_DEVICE is set.
891 iov_iter_init(&out_iter
, WRITE
, vq
->iov
, out
, out_size
);
893 if (unlikely(!copy_from_iter_full(req
, req_size
, &out_iter
))) {
894 vq_err(vq
, "Faulted on copy_from_iter\n");
895 vhost_scsi_send_bad_target(vs
, vq
, head
, out
);
898 /* virtio-scsi spec requires byte 0 of the lun to be 1 */
899 if (unlikely(*lunp
!= 1)) {
900 vq_err(vq
, "Illegal virtio-scsi lun: %u\n", *lunp
);
901 vhost_scsi_send_bad_target(vs
, vq
, head
, out
);
905 tpg
= READ_ONCE(vs_tpg
[*target
]);
906 if (unlikely(!tpg
)) {
907 /* Target does not exist, fail the request */
908 vhost_scsi_send_bad_target(vs
, vq
, head
, out
);
912 * Determine data_direction by calculating the total outgoing
913 * iovec sizes + incoming iovec sizes vs. virtio-scsi request +
914 * response headers respectively.
916 * For DMA_TO_DEVICE this is out_iter, which is already pointing
917 * to the right place.
919 * For DMA_FROM_DEVICE, the iovec will be just past the end
920 * of the virtio-scsi response header in either the same
921 * or immediately following iovec.
923 * Any associated T10_PI bytes for the outgoing / incoming
924 * payloads are included in calculation of exp_data_len here.
928 if (out_size
> req_size
) {
929 data_direction
= DMA_TO_DEVICE
;
930 exp_data_len
= out_size
- req_size
;
931 data_iter
= out_iter
;
932 } else if (in_size
> rsp_size
) {
933 data_direction
= DMA_FROM_DEVICE
;
934 exp_data_len
= in_size
- rsp_size
;
936 iov_iter_init(&in_iter
, READ
, &vq
->iov
[out
], in
,
937 rsp_size
+ exp_data_len
);
938 iov_iter_advance(&in_iter
, rsp_size
);
941 data_direction
= DMA_NONE
;
945 * If T10_PI header + payload is present, setup prot_iter values
946 * and recalculate data_iter for vhost_scsi_mapal() mapping to
947 * host scatterlists via get_user_pages_fast().
950 if (v_req_pi
.pi_bytesout
) {
951 if (data_direction
!= DMA_TO_DEVICE
) {
952 vq_err(vq
, "Received non zero pi_bytesout,"
953 " but wrong data_direction\n");
954 vhost_scsi_send_bad_target(vs
, vq
, head
, out
);
957 prot_bytes
= vhost32_to_cpu(vq
, v_req_pi
.pi_bytesout
);
958 } else if (v_req_pi
.pi_bytesin
) {
959 if (data_direction
!= DMA_FROM_DEVICE
) {
960 vq_err(vq
, "Received non zero pi_bytesin,"
961 " but wrong data_direction\n");
962 vhost_scsi_send_bad_target(vs
, vq
, head
, out
);
965 prot_bytes
= vhost32_to_cpu(vq
, v_req_pi
.pi_bytesin
);
968 * Set prot_iter to data_iter, and advance past any
969 * preceeding prot_bytes that may be present.
971 * Also fix up the exp_data_len to reflect only the
972 * actual data payload length.
975 exp_data_len
-= prot_bytes
;
976 prot_iter
= data_iter
;
977 iov_iter_advance(&data_iter
, prot_bytes
);
979 tag
= vhost64_to_cpu(vq
, v_req_pi
.tag
);
980 task_attr
= v_req_pi
.task_attr
;
981 cdb
= &v_req_pi
.cdb
[0];
982 lun
= ((v_req_pi
.lun
[2] << 8) | v_req_pi
.lun
[3]) & 0x3FFF;
984 tag
= vhost64_to_cpu(vq
, v_req
.tag
);
985 task_attr
= v_req
.task_attr
;
987 lun
= ((v_req
.lun
[2] << 8) | v_req
.lun
[3]) & 0x3FFF;
990 * Check that the received CDB size does not exceeded our
991 * hardcoded max for vhost-scsi, then get a pre-allocated
992 * cmd descriptor for the new virtio-scsi tag.
994 * TODO what if cdb was too small for varlen cdb header?
996 if (unlikely(scsi_command_size(cdb
) > VHOST_SCSI_MAX_CDB_SIZE
)) {
997 vq_err(vq
, "Received SCSI CDB with command_size: %d that"
998 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
999 scsi_command_size(cdb
), VHOST_SCSI_MAX_CDB_SIZE
);
1000 vhost_scsi_send_bad_target(vs
, vq
, head
, out
);
1003 cmd
= vhost_scsi_get_tag(vq
, tpg
, cdb
, tag
, lun
, task_attr
,
1004 exp_data_len
+ prot_bytes
,
1007 vq_err(vq
, "vhost_scsi_get_tag failed %ld\n",
1009 vhost_scsi_send_bad_target(vs
, vq
, head
, out
);
1012 cmd
->tvc_vhost
= vs
;
1014 cmd
->tvc_resp_iov
= vq
->iov
[out
];
1015 cmd
->tvc_in_iovs
= in
;
1017 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
1018 cmd
->tvc_cdb
[0], cmd
->tvc_lun
);
1019 pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:"
1020 " %d\n", cmd
, exp_data_len
, prot_bytes
, data_direction
);
1022 if (data_direction
!= DMA_NONE
) {
1023 ret
= vhost_scsi_mapal(cmd
,
1024 prot_bytes
, &prot_iter
,
1025 exp_data_len
, &data_iter
);
1026 if (unlikely(ret
)) {
1027 vq_err(vq
, "Failed to map iov to sgl\n");
1028 vhost_scsi_release_cmd(&cmd
->tvc_se_cmd
);
1029 vhost_scsi_send_bad_target(vs
, vq
, head
, out
);
1034 * Save the descriptor from vhost_get_vq_desc() to be used to
1035 * complete the virtio-scsi request in TCM callback context via
1036 * vhost_scsi_queue_data_in() and vhost_scsi_queue_status()
1038 cmd
->tvc_vq_desc
= head
;
1040 * Dispatch cmd descriptor for cmwq execution in process
1041 * context provided by vhost_scsi_workqueue. This also ensures
1042 * cmd is executed on the same kworker CPU as this vhost
1043 * thread to gain positive L2 cache locality effects.
1045 INIT_WORK(&cmd
->work
, vhost_scsi_submission_work
);
1046 queue_work(vhost_scsi_workqueue
, &cmd
->work
);
1049 mutex_unlock(&vq
->mutex
);
1052 static void vhost_scsi_ctl_handle_kick(struct vhost_work
*work
)
1054 pr_debug("%s: The handling func for control queue.\n", __func__
);
1058 vhost_scsi_send_evt(struct vhost_scsi
*vs
,
1059 struct vhost_scsi_tpg
*tpg
,
1064 struct vhost_scsi_evt
*evt
;
1066 evt
= vhost_scsi_allocate_evt(vs
, event
, reason
);
1071 /* TODO: share lun setup code with virtio-scsi.ko */
1073 * Note: evt->event is zeroed when we allocate it and
1074 * lun[4-7] need to be zero according to virtio-scsi spec.
1076 evt
->event
.lun
[0] = 0x01;
1077 evt
->event
.lun
[1] = tpg
->tport_tpgt
;
1078 if (lun
->unpacked_lun
>= 256)
1079 evt
->event
.lun
[2] = lun
->unpacked_lun
>> 8 | 0x40 ;
1080 evt
->event
.lun
[3] = lun
->unpacked_lun
& 0xFF;
1083 llist_add(&evt
->list
, &vs
->vs_event_list
);
1084 vhost_work_queue(&vs
->dev
, &vs
->vs_event_work
);
1087 static void vhost_scsi_evt_handle_kick(struct vhost_work
*work
)
1089 struct vhost_virtqueue
*vq
= container_of(work
, struct vhost_virtqueue
,
1091 struct vhost_scsi
*vs
= container_of(vq
->dev
, struct vhost_scsi
, dev
);
1093 mutex_lock(&vq
->mutex
);
1094 if (!vq
->private_data
)
1097 if (vs
->vs_events_missed
)
1098 vhost_scsi_send_evt(vs
, NULL
, NULL
, VIRTIO_SCSI_T_NO_EVENT
, 0);
1100 mutex_unlock(&vq
->mutex
);
1103 static void vhost_scsi_handle_kick(struct vhost_work
*work
)
1105 struct vhost_virtqueue
*vq
= container_of(work
, struct vhost_virtqueue
,
1107 struct vhost_scsi
*vs
= container_of(vq
->dev
, struct vhost_scsi
, dev
);
1109 vhost_scsi_handle_vq(vs
, vq
);
1112 static void vhost_scsi_flush_vq(struct vhost_scsi
*vs
, int index
)
1114 vhost_poll_flush(&vs
->vqs
[index
].vq
.poll
);
1117 /* Callers must hold dev mutex */
1118 static void vhost_scsi_flush(struct vhost_scsi
*vs
)
1120 struct vhost_scsi_inflight
*old_inflight
[VHOST_SCSI_MAX_VQ
];
1123 /* Init new inflight and remember the old inflight */
1124 vhost_scsi_init_inflight(vs
, old_inflight
);
1127 * The inflight->kref was initialized to 1. We decrement it here to
1128 * indicate the start of the flush operation so that it will reach 0
1129 * when all the reqs are finished.
1131 for (i
= 0; i
< VHOST_SCSI_MAX_VQ
; i
++)
1132 kref_put(&old_inflight
[i
]->kref
, vhost_scsi_done_inflight
);
1134 /* Flush both the vhost poll and vhost work */
1135 for (i
= 0; i
< VHOST_SCSI_MAX_VQ
; i
++)
1136 vhost_scsi_flush_vq(vs
, i
);
1137 vhost_work_flush(&vs
->dev
, &vs
->vs_completion_work
);
1138 vhost_work_flush(&vs
->dev
, &vs
->vs_event_work
);
1140 /* Wait for all reqs issued before the flush to be finished */
1141 for (i
= 0; i
< VHOST_SCSI_MAX_VQ
; i
++)
1142 wait_for_completion(&old_inflight
[i
]->comp
);
1146 * Called from vhost_scsi_ioctl() context to walk the list of available
1147 * vhost_scsi_tpg with an active struct vhost_scsi_nexus
1149 * The lock nesting rule is:
1150 * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
1153 vhost_scsi_set_endpoint(struct vhost_scsi
*vs
,
1154 struct vhost_scsi_target
*t
)
1156 struct se_portal_group
*se_tpg
;
1157 struct vhost_scsi_tport
*tv_tport
;
1158 struct vhost_scsi_tpg
*tpg
;
1159 struct vhost_scsi_tpg
**vs_tpg
;
1160 struct vhost_virtqueue
*vq
;
1161 int index
, ret
, i
, len
;
1164 mutex_lock(&vhost_scsi_mutex
);
1165 mutex_lock(&vs
->dev
.mutex
);
1167 /* Verify that ring has been setup correctly. */
1168 for (index
= 0; index
< vs
->dev
.nvqs
; ++index
) {
1169 /* Verify that ring has been setup correctly. */
1170 if (!vhost_vq_access_ok(&vs
->vqs
[index
].vq
)) {
1176 len
= sizeof(vs_tpg
[0]) * VHOST_SCSI_MAX_TARGET
;
1177 vs_tpg
= kzalloc(len
, GFP_KERNEL
);
1183 memcpy(vs_tpg
, vs
->vs_tpg
, len
);
1185 list_for_each_entry(tpg
, &vhost_scsi_list
, tv_tpg_list
) {
1186 mutex_lock(&tpg
->tv_tpg_mutex
);
1187 if (!tpg
->tpg_nexus
) {
1188 mutex_unlock(&tpg
->tv_tpg_mutex
);
1191 if (tpg
->tv_tpg_vhost_count
!= 0) {
1192 mutex_unlock(&tpg
->tv_tpg_mutex
);
1195 tv_tport
= tpg
->tport
;
1197 if (!strcmp(tv_tport
->tport_name
, t
->vhost_wwpn
)) {
1198 if (vs
->vs_tpg
&& vs
->vs_tpg
[tpg
->tport_tpgt
]) {
1200 mutex_unlock(&tpg
->tv_tpg_mutex
);
1205 * In order to ensure individual vhost-scsi configfs
1206 * groups cannot be removed while in use by vhost ioctl,
1207 * go ahead and take an explicit se_tpg->tpg_group.cg_item
1210 se_tpg
= &tpg
->se_tpg
;
1211 ret
= target_depend_item(&se_tpg
->tpg_group
.cg_item
);
1213 pr_warn("configfs_depend_item() failed: %d\n", ret
);
1215 mutex_unlock(&tpg
->tv_tpg_mutex
);
1218 tpg
->tv_tpg_vhost_count
++;
1219 tpg
->vhost_scsi
= vs
;
1220 vs_tpg
[tpg
->tport_tpgt
] = tpg
;
1221 smp_mb__after_atomic();
1224 mutex_unlock(&tpg
->tv_tpg_mutex
);
1228 memcpy(vs
->vs_vhost_wwpn
, t
->vhost_wwpn
,
1229 sizeof(vs
->vs_vhost_wwpn
));
1230 for (i
= 0; i
< VHOST_SCSI_MAX_VQ
; i
++) {
1231 vq
= &vs
->vqs
[i
].vq
;
1232 mutex_lock(&vq
->mutex
);
1233 vq
->private_data
= vs_tpg
;
1234 vhost_vq_init_access(vq
);
1235 mutex_unlock(&vq
->mutex
);
1243 * Act as synchronize_rcu to make sure access to
1244 * old vs->vs_tpg is finished.
1246 vhost_scsi_flush(vs
);
1248 vs
->vs_tpg
= vs_tpg
;
1251 mutex_unlock(&vs
->dev
.mutex
);
1252 mutex_unlock(&vhost_scsi_mutex
);
1257 vhost_scsi_clear_endpoint(struct vhost_scsi
*vs
,
1258 struct vhost_scsi_target
*t
)
1260 struct se_portal_group
*se_tpg
;
1261 struct vhost_scsi_tport
*tv_tport
;
1262 struct vhost_scsi_tpg
*tpg
;
1263 struct vhost_virtqueue
*vq
;
1268 mutex_lock(&vhost_scsi_mutex
);
1269 mutex_lock(&vs
->dev
.mutex
);
1270 /* Verify that ring has been setup correctly. */
1271 for (index
= 0; index
< vs
->dev
.nvqs
; ++index
) {
1272 if (!vhost_vq_access_ok(&vs
->vqs
[index
].vq
)) {
1283 for (i
= 0; i
< VHOST_SCSI_MAX_TARGET
; i
++) {
1285 tpg
= vs
->vs_tpg
[target
];
1289 mutex_lock(&tpg
->tv_tpg_mutex
);
1290 tv_tport
= tpg
->tport
;
1296 if (strcmp(tv_tport
->tport_name
, t
->vhost_wwpn
)) {
1297 pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
1298 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
1299 tv_tport
->tport_name
, tpg
->tport_tpgt
,
1300 t
->vhost_wwpn
, t
->vhost_tpgt
);
1304 tpg
->tv_tpg_vhost_count
--;
1305 tpg
->vhost_scsi
= NULL
;
1306 vs
->vs_tpg
[target
] = NULL
;
1308 mutex_unlock(&tpg
->tv_tpg_mutex
);
1310 * Release se_tpg->tpg_group.cg_item configfs dependency now
1311 * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur.
1313 se_tpg
= &tpg
->se_tpg
;
1314 target_undepend_item(&se_tpg
->tpg_group
.cg_item
);
1317 for (i
= 0; i
< VHOST_SCSI_MAX_VQ
; i
++) {
1318 vq
= &vs
->vqs
[i
].vq
;
1319 mutex_lock(&vq
->mutex
);
1320 vq
->private_data
= NULL
;
1321 mutex_unlock(&vq
->mutex
);
1325 * Act as synchronize_rcu to make sure access to
1326 * old vs->vs_tpg is finished.
1328 vhost_scsi_flush(vs
);
1331 WARN_ON(vs
->vs_events_nr
);
1332 mutex_unlock(&vs
->dev
.mutex
);
1333 mutex_unlock(&vhost_scsi_mutex
);
1337 mutex_unlock(&tpg
->tv_tpg_mutex
);
1339 mutex_unlock(&vs
->dev
.mutex
);
1340 mutex_unlock(&vhost_scsi_mutex
);
1344 static int vhost_scsi_set_features(struct vhost_scsi
*vs
, u64 features
)
1346 struct vhost_virtqueue
*vq
;
1349 if (features
& ~VHOST_SCSI_FEATURES
)
1352 mutex_lock(&vs
->dev
.mutex
);
1353 if ((features
& (1 << VHOST_F_LOG_ALL
)) &&
1354 !vhost_log_access_ok(&vs
->dev
)) {
1355 mutex_unlock(&vs
->dev
.mutex
);
1359 for (i
= 0; i
< VHOST_SCSI_MAX_VQ
; i
++) {
1360 vq
= &vs
->vqs
[i
].vq
;
1361 mutex_lock(&vq
->mutex
);
1362 vq
->acked_features
= features
;
1363 mutex_unlock(&vq
->mutex
);
1365 mutex_unlock(&vs
->dev
.mutex
);
1369 static int vhost_scsi_open(struct inode
*inode
, struct file
*f
)
1371 struct vhost_scsi
*vs
;
1372 struct vhost_virtqueue
**vqs
;
1375 vs
= kzalloc(sizeof(*vs
), GFP_KERNEL
| __GFP_NOWARN
| __GFP_RETRY_MAYFAIL
);
1377 vs
= vzalloc(sizeof(*vs
));
1382 vqs
= kmalloc(VHOST_SCSI_MAX_VQ
* sizeof(*vqs
), GFP_KERNEL
);
1386 vhost_work_init(&vs
->vs_completion_work
, vhost_scsi_complete_cmd_work
);
1387 vhost_work_init(&vs
->vs_event_work
, vhost_scsi_evt_work
);
1389 vs
->vs_events_nr
= 0;
1390 vs
->vs_events_missed
= false;
1392 vqs
[VHOST_SCSI_VQ_CTL
] = &vs
->vqs
[VHOST_SCSI_VQ_CTL
].vq
;
1393 vqs
[VHOST_SCSI_VQ_EVT
] = &vs
->vqs
[VHOST_SCSI_VQ_EVT
].vq
;
1394 vs
->vqs
[VHOST_SCSI_VQ_CTL
].vq
.handle_kick
= vhost_scsi_ctl_handle_kick
;
1395 vs
->vqs
[VHOST_SCSI_VQ_EVT
].vq
.handle_kick
= vhost_scsi_evt_handle_kick
;
1396 for (i
= VHOST_SCSI_VQ_IO
; i
< VHOST_SCSI_MAX_VQ
; i
++) {
1397 vqs
[i
] = &vs
->vqs
[i
].vq
;
1398 vs
->vqs
[i
].vq
.handle_kick
= vhost_scsi_handle_kick
;
1400 vhost_dev_init(&vs
->dev
, vqs
, VHOST_SCSI_MAX_VQ
);
1402 vhost_scsi_init_inflight(vs
, NULL
);
1404 f
->private_data
= vs
;
1413 static int vhost_scsi_release(struct inode
*inode
, struct file
*f
)
1415 struct vhost_scsi
*vs
= f
->private_data
;
1416 struct vhost_scsi_target t
;
1418 mutex_lock(&vs
->dev
.mutex
);
1419 memcpy(t
.vhost_wwpn
, vs
->vs_vhost_wwpn
, sizeof(t
.vhost_wwpn
));
1420 mutex_unlock(&vs
->dev
.mutex
);
1421 vhost_scsi_clear_endpoint(vs
, &t
);
1422 vhost_dev_stop(&vs
->dev
);
1423 vhost_dev_cleanup(&vs
->dev
, false);
1424 /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
1425 vhost_scsi_flush(vs
);
1432 vhost_scsi_ioctl(struct file
*f
,
1436 struct vhost_scsi
*vs
= f
->private_data
;
1437 struct vhost_scsi_target backend
;
1438 void __user
*argp
= (void __user
*)arg
;
1439 u64 __user
*featurep
= argp
;
1440 u32 __user
*eventsp
= argp
;
1443 int r
, abi_version
= VHOST_SCSI_ABI_VERSION
;
1444 struct vhost_virtqueue
*vq
= &vs
->vqs
[VHOST_SCSI_VQ_EVT
].vq
;
1447 case VHOST_SCSI_SET_ENDPOINT
:
1448 if (copy_from_user(&backend
, argp
, sizeof backend
))
1450 if (backend
.reserved
!= 0)
1453 return vhost_scsi_set_endpoint(vs
, &backend
);
1454 case VHOST_SCSI_CLEAR_ENDPOINT
:
1455 if (copy_from_user(&backend
, argp
, sizeof backend
))
1457 if (backend
.reserved
!= 0)
1460 return vhost_scsi_clear_endpoint(vs
, &backend
);
1461 case VHOST_SCSI_GET_ABI_VERSION
:
1462 if (copy_to_user(argp
, &abi_version
, sizeof abi_version
))
1465 case VHOST_SCSI_SET_EVENTS_MISSED
:
1466 if (get_user(events_missed
, eventsp
))
1468 mutex_lock(&vq
->mutex
);
1469 vs
->vs_events_missed
= events_missed
;
1470 mutex_unlock(&vq
->mutex
);
1472 case VHOST_SCSI_GET_EVENTS_MISSED
:
1473 mutex_lock(&vq
->mutex
);
1474 events_missed
= vs
->vs_events_missed
;
1475 mutex_unlock(&vq
->mutex
);
1476 if (put_user(events_missed
, eventsp
))
1479 case VHOST_GET_FEATURES
:
1480 features
= VHOST_SCSI_FEATURES
;
1481 if (copy_to_user(featurep
, &features
, sizeof features
))
1484 case VHOST_SET_FEATURES
:
1485 if (copy_from_user(&features
, featurep
, sizeof features
))
1487 return vhost_scsi_set_features(vs
, features
);
1489 mutex_lock(&vs
->dev
.mutex
);
1490 r
= vhost_dev_ioctl(&vs
->dev
, ioctl
, argp
);
1491 /* TODO: flush backend after dev ioctl. */
1492 if (r
== -ENOIOCTLCMD
)
1493 r
= vhost_vring_ioctl(&vs
->dev
, ioctl
, argp
);
1494 mutex_unlock(&vs
->dev
.mutex
);
1499 #ifdef CONFIG_COMPAT
1500 static long vhost_scsi_compat_ioctl(struct file
*f
, unsigned int ioctl
,
1503 return vhost_scsi_ioctl(f
, ioctl
, (unsigned long)compat_ptr(arg
));
1507 static const struct file_operations vhost_scsi_fops
= {
1508 .owner
= THIS_MODULE
,
1509 .release
= vhost_scsi_release
,
1510 .unlocked_ioctl
= vhost_scsi_ioctl
,
1511 #ifdef CONFIG_COMPAT
1512 .compat_ioctl
= vhost_scsi_compat_ioctl
,
1514 .open
= vhost_scsi_open
,
1515 .llseek
= noop_llseek
,
1518 static struct miscdevice vhost_scsi_misc
= {
1524 static int __init
vhost_scsi_register(void)
1526 return misc_register(&vhost_scsi_misc
);
1529 static void vhost_scsi_deregister(void)
1531 misc_deregister(&vhost_scsi_misc
);
1534 static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport
*tport
)
1536 switch (tport
->tport_proto_id
) {
1537 case SCSI_PROTOCOL_SAS
:
1539 case SCSI_PROTOCOL_FCP
:
1541 case SCSI_PROTOCOL_ISCSI
:
1551 vhost_scsi_do_plug(struct vhost_scsi_tpg
*tpg
,
1552 struct se_lun
*lun
, bool plug
)
1555 struct vhost_scsi
*vs
= tpg
->vhost_scsi
;
1556 struct vhost_virtqueue
*vq
;
1562 mutex_lock(&vs
->dev
.mutex
);
1565 reason
= VIRTIO_SCSI_EVT_RESET_RESCAN
;
1567 reason
= VIRTIO_SCSI_EVT_RESET_REMOVED
;
1569 vq
= &vs
->vqs
[VHOST_SCSI_VQ_EVT
].vq
;
1570 mutex_lock(&vq
->mutex
);
1571 if (vhost_has_feature(vq
, VIRTIO_SCSI_F_HOTPLUG
))
1572 vhost_scsi_send_evt(vs
, tpg
, lun
,
1573 VIRTIO_SCSI_T_TRANSPORT_RESET
, reason
);
1574 mutex_unlock(&vq
->mutex
);
1575 mutex_unlock(&vs
->dev
.mutex
);
1578 static void vhost_scsi_hotplug(struct vhost_scsi_tpg
*tpg
, struct se_lun
*lun
)
1580 vhost_scsi_do_plug(tpg
, lun
, true);
1583 static void vhost_scsi_hotunplug(struct vhost_scsi_tpg
*tpg
, struct se_lun
*lun
)
1585 vhost_scsi_do_plug(tpg
, lun
, false);
1588 static int vhost_scsi_port_link(struct se_portal_group
*se_tpg
,
1591 struct vhost_scsi_tpg
*tpg
= container_of(se_tpg
,
1592 struct vhost_scsi_tpg
, se_tpg
);
1594 mutex_lock(&vhost_scsi_mutex
);
1596 mutex_lock(&tpg
->tv_tpg_mutex
);
1597 tpg
->tv_tpg_port_count
++;
1598 mutex_unlock(&tpg
->tv_tpg_mutex
);
1600 vhost_scsi_hotplug(tpg
, lun
);
1602 mutex_unlock(&vhost_scsi_mutex
);
1607 static void vhost_scsi_port_unlink(struct se_portal_group
*se_tpg
,
1610 struct vhost_scsi_tpg
*tpg
= container_of(se_tpg
,
1611 struct vhost_scsi_tpg
, se_tpg
);
1613 mutex_lock(&vhost_scsi_mutex
);
1615 mutex_lock(&tpg
->tv_tpg_mutex
);
1616 tpg
->tv_tpg_port_count
--;
1617 mutex_unlock(&tpg
->tv_tpg_mutex
);
1619 vhost_scsi_hotunplug(tpg
, lun
);
1621 mutex_unlock(&vhost_scsi_mutex
);
1624 static void vhost_scsi_free_cmd_map_res(struct se_session
*se_sess
)
1626 struct vhost_scsi_cmd
*tv_cmd
;
1629 if (!se_sess
->sess_cmd_map
)
1632 for (i
= 0; i
< VHOST_SCSI_DEFAULT_TAGS
; i
++) {
1633 tv_cmd
= &((struct vhost_scsi_cmd
*)se_sess
->sess_cmd_map
)[i
];
1635 kfree(tv_cmd
->tvc_sgl
);
1636 kfree(tv_cmd
->tvc_prot_sgl
);
1637 kfree(tv_cmd
->tvc_upages
);
1641 static ssize_t
vhost_scsi_tpg_attrib_fabric_prot_type_store(
1642 struct config_item
*item
, const char *page
, size_t count
)
1644 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
1645 struct vhost_scsi_tpg
*tpg
= container_of(se_tpg
,
1646 struct vhost_scsi_tpg
, se_tpg
);
1648 int ret
= kstrtoul(page
, 0, &val
);
1651 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret
);
1654 if (val
!= 0 && val
!= 1 && val
!= 3) {
1655 pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val
);
1658 tpg
->tv_fabric_prot_type
= val
;
1663 static ssize_t
vhost_scsi_tpg_attrib_fabric_prot_type_show(
1664 struct config_item
*item
, char *page
)
1666 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
1667 struct vhost_scsi_tpg
*tpg
= container_of(se_tpg
,
1668 struct vhost_scsi_tpg
, se_tpg
);
1670 return sprintf(page
, "%d\n", tpg
->tv_fabric_prot_type
);
1673 CONFIGFS_ATTR(vhost_scsi_tpg_attrib_
, fabric_prot_type
);
1675 static struct configfs_attribute
*vhost_scsi_tpg_attrib_attrs
[] = {
1676 &vhost_scsi_tpg_attrib_attr_fabric_prot_type
,
1680 static int vhost_scsi_nexus_cb(struct se_portal_group
*se_tpg
,
1681 struct se_session
*se_sess
, void *p
)
1683 struct vhost_scsi_cmd
*tv_cmd
;
1686 for (i
= 0; i
< VHOST_SCSI_DEFAULT_TAGS
; i
++) {
1687 tv_cmd
= &((struct vhost_scsi_cmd
*)se_sess
->sess_cmd_map
)[i
];
1689 tv_cmd
->tvc_sgl
= kzalloc(sizeof(struct scatterlist
) *
1690 VHOST_SCSI_PREALLOC_SGLS
, GFP_KERNEL
);
1691 if (!tv_cmd
->tvc_sgl
) {
1692 pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
1696 tv_cmd
->tvc_upages
= kzalloc(sizeof(struct page
*) *
1697 VHOST_SCSI_PREALLOC_UPAGES
, GFP_KERNEL
);
1698 if (!tv_cmd
->tvc_upages
) {
1699 pr_err("Unable to allocate tv_cmd->tvc_upages\n");
1703 tv_cmd
->tvc_prot_sgl
= kzalloc(sizeof(struct scatterlist
) *
1704 VHOST_SCSI_PREALLOC_PROT_SGLS
, GFP_KERNEL
);
1705 if (!tv_cmd
->tvc_prot_sgl
) {
1706 pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
1712 vhost_scsi_free_cmd_map_res(se_sess
);
1716 static int vhost_scsi_make_nexus(struct vhost_scsi_tpg
*tpg
,
1719 struct vhost_scsi_nexus
*tv_nexus
;
1721 mutex_lock(&tpg
->tv_tpg_mutex
);
1722 if (tpg
->tpg_nexus
) {
1723 mutex_unlock(&tpg
->tv_tpg_mutex
);
1724 pr_debug("tpg->tpg_nexus already exists\n");
1728 tv_nexus
= kzalloc(sizeof(struct vhost_scsi_nexus
), GFP_KERNEL
);
1730 mutex_unlock(&tpg
->tv_tpg_mutex
);
1731 pr_err("Unable to allocate struct vhost_scsi_nexus\n");
1735 * Since we are running in 'demo mode' this call with generate a
1736 * struct se_node_acl for the vhost_scsi struct se_portal_group with
1737 * the SCSI Initiator port name of the passed configfs group 'name'.
1739 tv_nexus
->tvn_se_sess
= target_alloc_session(&tpg
->se_tpg
,
1740 VHOST_SCSI_DEFAULT_TAGS
,
1741 sizeof(struct vhost_scsi_cmd
),
1742 TARGET_PROT_DIN_PASS
| TARGET_PROT_DOUT_PASS
,
1743 (unsigned char *)name
, tv_nexus
,
1744 vhost_scsi_nexus_cb
);
1745 if (IS_ERR(tv_nexus
->tvn_se_sess
)) {
1746 mutex_unlock(&tpg
->tv_tpg_mutex
);
1750 tpg
->tpg_nexus
= tv_nexus
;
1752 mutex_unlock(&tpg
->tv_tpg_mutex
);
1756 static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg
*tpg
)
1758 struct se_session
*se_sess
;
1759 struct vhost_scsi_nexus
*tv_nexus
;
1761 mutex_lock(&tpg
->tv_tpg_mutex
);
1762 tv_nexus
= tpg
->tpg_nexus
;
1764 mutex_unlock(&tpg
->tv_tpg_mutex
);
1768 se_sess
= tv_nexus
->tvn_se_sess
;
1770 mutex_unlock(&tpg
->tv_tpg_mutex
);
1774 if (tpg
->tv_tpg_port_count
!= 0) {
1775 mutex_unlock(&tpg
->tv_tpg_mutex
);
1776 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1777 " active TPG port count: %d\n",
1778 tpg
->tv_tpg_port_count
);
1782 if (tpg
->tv_tpg_vhost_count
!= 0) {
1783 mutex_unlock(&tpg
->tv_tpg_mutex
);
1784 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1785 " active TPG vhost count: %d\n",
1786 tpg
->tv_tpg_vhost_count
);
1790 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
1791 " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg
->tport
),
1792 tv_nexus
->tvn_se_sess
->se_node_acl
->initiatorname
);
1794 vhost_scsi_free_cmd_map_res(se_sess
);
1796 * Release the SCSI I_T Nexus to the emulated vhost Target Port
1798 transport_deregister_session(tv_nexus
->tvn_se_sess
);
1799 tpg
->tpg_nexus
= NULL
;
1800 mutex_unlock(&tpg
->tv_tpg_mutex
);
1806 static ssize_t
vhost_scsi_tpg_nexus_show(struct config_item
*item
, char *page
)
1808 struct se_portal_group
*se_tpg
= to_tpg(item
);
1809 struct vhost_scsi_tpg
*tpg
= container_of(se_tpg
,
1810 struct vhost_scsi_tpg
, se_tpg
);
1811 struct vhost_scsi_nexus
*tv_nexus
;
1814 mutex_lock(&tpg
->tv_tpg_mutex
);
1815 tv_nexus
= tpg
->tpg_nexus
;
1817 mutex_unlock(&tpg
->tv_tpg_mutex
);
1820 ret
= snprintf(page
, PAGE_SIZE
, "%s\n",
1821 tv_nexus
->tvn_se_sess
->se_node_acl
->initiatorname
);
1822 mutex_unlock(&tpg
->tv_tpg_mutex
);
1827 static ssize_t
vhost_scsi_tpg_nexus_store(struct config_item
*item
,
1828 const char *page
, size_t count
)
1830 struct se_portal_group
*se_tpg
= to_tpg(item
);
1831 struct vhost_scsi_tpg
*tpg
= container_of(se_tpg
,
1832 struct vhost_scsi_tpg
, se_tpg
);
1833 struct vhost_scsi_tport
*tport_wwn
= tpg
->tport
;
1834 unsigned char i_port
[VHOST_SCSI_NAMELEN
], *ptr
, *port_ptr
;
1837 * Shutdown the active I_T nexus if 'NULL' is passed..
1839 if (!strncmp(page
, "NULL", 4)) {
1840 ret
= vhost_scsi_drop_nexus(tpg
);
1841 return (!ret
) ? count
: ret
;
1844 * Otherwise make sure the passed virtual Initiator port WWN matches
1845 * the fabric protocol_id set in vhost_scsi_make_tport(), and call
1846 * vhost_scsi_make_nexus().
1848 if (strlen(page
) >= VHOST_SCSI_NAMELEN
) {
1849 pr_err("Emulated NAA Sas Address: %s, exceeds"
1850 " max: %d\n", page
, VHOST_SCSI_NAMELEN
);
1853 snprintf(&i_port
[0], VHOST_SCSI_NAMELEN
, "%s", page
);
1855 ptr
= strstr(i_port
, "naa.");
1857 if (tport_wwn
->tport_proto_id
!= SCSI_PROTOCOL_SAS
) {
1858 pr_err("Passed SAS Initiator Port %s does not"
1859 " match target port protoid: %s\n", i_port
,
1860 vhost_scsi_dump_proto_id(tport_wwn
));
1863 port_ptr
= &i_port
[0];
1866 ptr
= strstr(i_port
, "fc.");
1868 if (tport_wwn
->tport_proto_id
!= SCSI_PROTOCOL_FCP
) {
1869 pr_err("Passed FCP Initiator Port %s does not"
1870 " match target port protoid: %s\n", i_port
,
1871 vhost_scsi_dump_proto_id(tport_wwn
));
1874 port_ptr
= &i_port
[3]; /* Skip over "fc." */
1877 ptr
= strstr(i_port
, "iqn.");
1879 if (tport_wwn
->tport_proto_id
!= SCSI_PROTOCOL_ISCSI
) {
1880 pr_err("Passed iSCSI Initiator Port %s does not"
1881 " match target port protoid: %s\n", i_port
,
1882 vhost_scsi_dump_proto_id(tport_wwn
));
1885 port_ptr
= &i_port
[0];
1888 pr_err("Unable to locate prefix for emulated Initiator Port:"
1892 * Clear any trailing newline for the NAA WWN
1895 if (i_port
[strlen(i_port
)-1] == '\n')
1896 i_port
[strlen(i_port
)-1] = '\0';
1898 ret
= vhost_scsi_make_nexus(tpg
, port_ptr
);
1905 CONFIGFS_ATTR(vhost_scsi_tpg_
, nexus
);
1907 static struct configfs_attribute
*vhost_scsi_tpg_attrs
[] = {
1908 &vhost_scsi_tpg_attr_nexus
,
1912 static struct se_portal_group
*
1913 vhost_scsi_make_tpg(struct se_wwn
*wwn
,
1914 struct config_group
*group
,
1917 struct vhost_scsi_tport
*tport
= container_of(wwn
,
1918 struct vhost_scsi_tport
, tport_wwn
);
1920 struct vhost_scsi_tpg
*tpg
;
1924 if (strstr(name
, "tpgt_") != name
)
1925 return ERR_PTR(-EINVAL
);
1926 if (kstrtou16(name
+ 5, 10, &tpgt
) || tpgt
>= VHOST_SCSI_MAX_TARGET
)
1927 return ERR_PTR(-EINVAL
);
1929 tpg
= kzalloc(sizeof(struct vhost_scsi_tpg
), GFP_KERNEL
);
1931 pr_err("Unable to allocate struct vhost_scsi_tpg");
1932 return ERR_PTR(-ENOMEM
);
1934 mutex_init(&tpg
->tv_tpg_mutex
);
1935 INIT_LIST_HEAD(&tpg
->tv_tpg_list
);
1937 tpg
->tport_tpgt
= tpgt
;
1939 ret
= core_tpg_register(wwn
, &tpg
->se_tpg
, tport
->tport_proto_id
);
1944 mutex_lock(&vhost_scsi_mutex
);
1945 list_add_tail(&tpg
->tv_tpg_list
, &vhost_scsi_list
);
1946 mutex_unlock(&vhost_scsi_mutex
);
1948 return &tpg
->se_tpg
;
1951 static void vhost_scsi_drop_tpg(struct se_portal_group
*se_tpg
)
1953 struct vhost_scsi_tpg
*tpg
= container_of(se_tpg
,
1954 struct vhost_scsi_tpg
, se_tpg
);
1956 mutex_lock(&vhost_scsi_mutex
);
1957 list_del(&tpg
->tv_tpg_list
);
1958 mutex_unlock(&vhost_scsi_mutex
);
1960 * Release the virtual I_T Nexus for this vhost TPG
1962 vhost_scsi_drop_nexus(tpg
);
1964 * Deregister the se_tpg from TCM..
1966 core_tpg_deregister(se_tpg
);
1970 static struct se_wwn
*
1971 vhost_scsi_make_tport(struct target_fabric_configfs
*tf
,
1972 struct config_group
*group
,
1975 struct vhost_scsi_tport
*tport
;
1980 /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
1981 return ERR_PTR(-EINVAL); */
1983 tport
= kzalloc(sizeof(struct vhost_scsi_tport
), GFP_KERNEL
);
1985 pr_err("Unable to allocate struct vhost_scsi_tport");
1986 return ERR_PTR(-ENOMEM
);
1988 tport
->tport_wwpn
= wwpn
;
1990 * Determine the emulated Protocol Identifier and Target Port Name
1991 * based on the incoming configfs directory name.
1993 ptr
= strstr(name
, "naa.");
1995 tport
->tport_proto_id
= SCSI_PROTOCOL_SAS
;
1998 ptr
= strstr(name
, "fc.");
2000 tport
->tport_proto_id
= SCSI_PROTOCOL_FCP
;
2001 off
= 3; /* Skip over "fc." */
2004 ptr
= strstr(name
, "iqn.");
2006 tport
->tport_proto_id
= SCSI_PROTOCOL_ISCSI
;
2010 pr_err("Unable to locate prefix for emulated Target Port:"
2013 return ERR_PTR(-EINVAL
);
2016 if (strlen(name
) >= VHOST_SCSI_NAMELEN
) {
2017 pr_err("Emulated %s Address: %s, exceeds"
2018 " max: %d\n", name
, vhost_scsi_dump_proto_id(tport
),
2019 VHOST_SCSI_NAMELEN
);
2021 return ERR_PTR(-EINVAL
);
2023 snprintf(&tport
->tport_name
[0], VHOST_SCSI_NAMELEN
, "%s", &name
[off
]);
2025 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
2026 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport
), name
);
2028 return &tport
->tport_wwn
;
2031 static void vhost_scsi_drop_tport(struct se_wwn
*wwn
)
2033 struct vhost_scsi_tport
*tport
= container_of(wwn
,
2034 struct vhost_scsi_tport
, tport_wwn
);
2036 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
2037 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport
),
2044 vhost_scsi_wwn_version_show(struct config_item
*item
, char *page
)
2046 return sprintf(page
, "TCM_VHOST fabric module %s on %s/%s"
2047 "on "UTS_RELEASE
"\n", VHOST_SCSI_VERSION
, utsname()->sysname
,
2048 utsname()->machine
);
2051 CONFIGFS_ATTR_RO(vhost_scsi_wwn_
, version
);
2053 static struct configfs_attribute
*vhost_scsi_wwn_attrs
[] = {
2054 &vhost_scsi_wwn_attr_version
,
2058 static const struct target_core_fabric_ops vhost_scsi_ops
= {
2059 .module
= THIS_MODULE
,
2061 .get_fabric_name
= vhost_scsi_get_fabric_name
,
2062 .tpg_get_wwn
= vhost_scsi_get_fabric_wwn
,
2063 .tpg_get_tag
= vhost_scsi_get_tpgt
,
2064 .tpg_check_demo_mode
= vhost_scsi_check_true
,
2065 .tpg_check_demo_mode_cache
= vhost_scsi_check_true
,
2066 .tpg_check_demo_mode_write_protect
= vhost_scsi_check_false
,
2067 .tpg_check_prod_mode_write_protect
= vhost_scsi_check_false
,
2068 .tpg_check_prot_fabric_only
= vhost_scsi_check_prot_fabric_only
,
2069 .tpg_get_inst_index
= vhost_scsi_tpg_get_inst_index
,
2070 .release_cmd
= vhost_scsi_release_cmd
,
2071 .check_stop_free
= vhost_scsi_check_stop_free
,
2072 .sess_get_index
= vhost_scsi_sess_get_index
,
2073 .sess_get_initiator_sid
= NULL
,
2074 .write_pending
= vhost_scsi_write_pending
,
2075 .write_pending_status
= vhost_scsi_write_pending_status
,
2076 .set_default_node_attributes
= vhost_scsi_set_default_node_attrs
,
2077 .get_cmd_state
= vhost_scsi_get_cmd_state
,
2078 .queue_data_in
= vhost_scsi_queue_data_in
,
2079 .queue_status
= vhost_scsi_queue_status
,
2080 .queue_tm_rsp
= vhost_scsi_queue_tm_rsp
,
2081 .aborted_task
= vhost_scsi_aborted_task
,
2083 * Setup callers for generic logic in target_core_fabric_configfs.c
2085 .fabric_make_wwn
= vhost_scsi_make_tport
,
2086 .fabric_drop_wwn
= vhost_scsi_drop_tport
,
2087 .fabric_make_tpg
= vhost_scsi_make_tpg
,
2088 .fabric_drop_tpg
= vhost_scsi_drop_tpg
,
2089 .fabric_post_link
= vhost_scsi_port_link
,
2090 .fabric_pre_unlink
= vhost_scsi_port_unlink
,
2092 .tfc_wwn_attrs
= vhost_scsi_wwn_attrs
,
2093 .tfc_tpg_base_attrs
= vhost_scsi_tpg_attrs
,
2094 .tfc_tpg_attrib_attrs
= vhost_scsi_tpg_attrib_attrs
,
2097 static int __init
vhost_scsi_init(void)
2101 pr_debug("TCM_VHOST fabric module %s on %s/%s"
2102 " on "UTS_RELEASE
"\n", VHOST_SCSI_VERSION
, utsname()->sysname
,
2103 utsname()->machine
);
2106 * Use our own dedicated workqueue for submitting I/O into
2107 * target core to avoid contention within system_wq.
2109 vhost_scsi_workqueue
= alloc_workqueue("vhost_scsi", 0, 0);
2110 if (!vhost_scsi_workqueue
)
2113 ret
= vhost_scsi_register();
2115 goto out_destroy_workqueue
;
2117 ret
= target_register_template(&vhost_scsi_ops
);
2119 goto out_vhost_scsi_deregister
;
2123 out_vhost_scsi_deregister
:
2124 vhost_scsi_deregister();
2125 out_destroy_workqueue
:
2126 destroy_workqueue(vhost_scsi_workqueue
);
2131 static void vhost_scsi_exit(void)
2133 target_unregister_template(&vhost_scsi_ops
);
2134 vhost_scsi_deregister();
2135 destroy_workqueue(vhost_scsi_workqueue
);
2138 MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2139 MODULE_ALIAS("tcm_vhost");
2140 MODULE_LICENSE("GPL");
2141 module_init(vhost_scsi_init
);
2142 module_exit(vhost_scsi_exit
);