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 /* Max number of requests before requeueing the job.
62 * Using this limit prevents one virtqueue from starving others with
65 #define VHOST_SCSI_WEIGHT 256
67 struct vhost_scsi_inflight {
68 /* Wait for the flush operation to finish */
69 struct completion comp;
70 /* Refcount for the inflight reqs */
74 struct vhost_scsi_cmd {
75 /* Descriptor from vhost_get_vq_desc() for virt_queue segment */
77 /* virtio-scsi initiator task attribute */
79 /* virtio-scsi response incoming iovecs */
81 /* virtio-scsi initiator data direction */
82 enum dma_data_direction tvc_data_direction;
83 /* Expected data transfer length from virtio-scsi header */
85 /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
87 /* The number of scatterlists associated with this cmd */
89 u32 tvc_prot_sgl_count;
90 /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */
92 /* Pointer to the SGL formatted memory from virtio-scsi */
93 struct scatterlist *tvc_sgl;
94 struct scatterlist *tvc_prot_sgl;
95 struct page **tvc_upages;
96 /* Pointer to response header iovec */
97 struct iovec tvc_resp_iov;
98 /* Pointer to vhost_scsi for our device */
99 struct vhost_scsi *tvc_vhost;
100 /* Pointer to vhost_virtqueue for the cmd */
101 struct vhost_virtqueue *tvc_vq;
102 /* Pointer to vhost nexus memory */
103 struct vhost_scsi_nexus *tvc_nexus;
104 /* The TCM I/O descriptor that is accessed via container_of() */
105 struct se_cmd tvc_se_cmd;
106 /* work item used for cmwq dispatch to vhost_scsi_submission_work() */
107 struct work_struct work;
108 /* Copy of the incoming SCSI command descriptor block (CDB) */
109 unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE];
110 /* Sense buffer that will be mapped into outgoing status */
111 unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
112 /* Completed commands list, serviced from vhost worker thread */
113 struct llist_node tvc_completion_list;
114 /* Used to track inflight cmd */
115 struct vhost_scsi_inflight *inflight;
118 struct vhost_scsi_nexus {
119 /* Pointer to TCM session for I_T Nexus */
120 struct se_session *tvn_se_sess;
123 struct vhost_scsi_tpg {
124 /* Vhost port target portal group tag for TCM */
126 /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
127 int tv_tpg_port_count;
128 /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
129 int tv_tpg_vhost_count;
130 /* Used for enabling T10-PI with legacy devices */
131 int tv_fabric_prot_type;
132 /* list for vhost_scsi_list */
133 struct list_head tv_tpg_list;
134 /* Used to protect access for tpg_nexus */
135 struct mutex tv_tpg_mutex;
136 /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
137 struct vhost_scsi_nexus *tpg_nexus;
138 /* Pointer back to vhost_scsi_tport */
139 struct vhost_scsi_tport *tport;
140 /* Returned by vhost_scsi_make_tpg() */
141 struct se_portal_group se_tpg;
142 /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */
143 struct vhost_scsi *vhost_scsi;
146 struct vhost_scsi_tport {
147 /* SCSI protocol the tport is providing */
149 /* Binary World Wide unique Port Name for Vhost Target port */
151 /* ASCII formatted WWPN for Vhost Target port */
152 char tport_name[VHOST_SCSI_NAMELEN];
153 /* Returned by vhost_scsi_make_tport() */
154 struct se_wwn tport_wwn;
157 struct vhost_scsi_evt {
158 /* event to be sent to guest */
159 struct virtio_scsi_event event;
160 /* event list, serviced from vhost worker thread */
161 struct llist_node list;
165 VHOST_SCSI_VQ_CTL = 0,
166 VHOST_SCSI_VQ_EVT = 1,
167 VHOST_SCSI_VQ_IO = 2,
170 /* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */
172 VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
173 (1ULL << VIRTIO_SCSI_F_T10_PI)
176 #define VHOST_SCSI_MAX_TARGET 256
177 #define VHOST_SCSI_MAX_VQ 128
178 #define VHOST_SCSI_MAX_EVENT 128
180 struct vhost_scsi_virtqueue {
181 struct vhost_virtqueue vq;
183 * Reference counting for inflight reqs, used for flush operation. At
184 * each time, one reference tracks new commands submitted, while we
185 * wait for another one to reach 0.
187 struct vhost_scsi_inflight inflights[2];
189 * Indicate current inflight in use, protected by vq->mutex.
190 * Writers must also take dev mutex and flush under it.
196 /* Protected by vhost_scsi->dev.mutex */
197 struct vhost_scsi_tpg **vs_tpg;
198 char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
200 struct vhost_dev dev;
201 struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ];
203 struct vhost_work vs_completion_work; /* cmd completion work item */
204 struct llist_head vs_completion_list; /* cmd completion queue */
206 struct vhost_work vs_event_work; /* evt injection work item */
207 struct llist_head vs_event_list; /* evt injection queue */
209 bool vs_events_missed; /* any missed events, protected by vq->mutex */
210 int vs_events_nr; /* num of pending events, protected by vq->mutex */
213 static struct workqueue_struct *vhost_scsi_workqueue;
215 /* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */
216 static DEFINE_MUTEX(vhost_scsi_mutex);
217 static LIST_HEAD(vhost_scsi_list);
219 static int iov_num_pages(void __user *iov_base, size_t iov_len)
221 return (PAGE_ALIGN((unsigned long)iov_base + iov_len) -
222 ((unsigned long)iov_base & PAGE_MASK)) >> PAGE_SHIFT;
225 static void vhost_scsi_done_inflight(struct kref *kref)
227 struct vhost_scsi_inflight *inflight;
229 inflight = container_of(kref, struct vhost_scsi_inflight, kref);
230 complete(&inflight->comp);
233 static void vhost_scsi_init_inflight(struct vhost_scsi *vs,
234 struct vhost_scsi_inflight *old_inflight[])
236 struct vhost_scsi_inflight *new_inflight;
237 struct vhost_virtqueue *vq;
240 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
243 mutex_lock(&vq->mutex);
245 /* store old infight */
246 idx = vs->vqs[i].inflight_idx;
248 old_inflight[i] = &vs->vqs[i].inflights[idx];
250 /* setup new infight */
251 vs->vqs[i].inflight_idx = idx ^ 1;
252 new_inflight = &vs->vqs[i].inflights[idx ^ 1];
253 kref_init(&new_inflight->kref);
254 init_completion(&new_inflight->comp);
256 mutex_unlock(&vq->mutex);
260 static struct vhost_scsi_inflight *
261 vhost_scsi_get_inflight(struct vhost_virtqueue *vq)
263 struct vhost_scsi_inflight *inflight;
264 struct vhost_scsi_virtqueue *svq;
266 svq = container_of(vq, struct vhost_scsi_virtqueue, vq);
267 inflight = &svq->inflights[svq->inflight_idx];
268 kref_get(&inflight->kref);
273 static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight)
275 kref_put(&inflight->kref, vhost_scsi_done_inflight);
278 static int vhost_scsi_check_true(struct se_portal_group *se_tpg)
283 static int vhost_scsi_check_false(struct se_portal_group *se_tpg)
288 static char *vhost_scsi_get_fabric_name(void)
293 static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg)
295 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
296 struct vhost_scsi_tpg, se_tpg);
297 struct vhost_scsi_tport *tport = tpg->tport;
299 return &tport->tport_name[0];
302 static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg)
304 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
305 struct vhost_scsi_tpg, se_tpg);
306 return tpg->tport_tpgt;
309 static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg)
311 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
312 struct vhost_scsi_tpg, se_tpg);
314 return tpg->tv_fabric_prot_type;
317 static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg)
322 static void vhost_scsi_release_cmd(struct se_cmd *se_cmd)
324 struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd,
325 struct vhost_scsi_cmd, tvc_se_cmd);
326 struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess;
329 if (tv_cmd->tvc_sgl_count) {
330 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
331 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
333 if (tv_cmd->tvc_prot_sgl_count) {
334 for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++)
335 put_page(sg_page(&tv_cmd->tvc_prot_sgl[i]));
338 vhost_scsi_put_inflight(tv_cmd->inflight);
339 percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag);
342 static u32 vhost_scsi_sess_get_index(struct se_session *se_sess)
347 static int vhost_scsi_write_pending(struct se_cmd *se_cmd)
349 /* Go ahead and process the write immediately */
350 target_execute_cmd(se_cmd);
354 static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd)
359 static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl)
364 static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd)
369 static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd)
371 struct vhost_scsi *vs = cmd->tvc_vhost;
373 llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);
375 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
378 static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd)
380 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
381 struct vhost_scsi_cmd, tvc_se_cmd);
382 vhost_scsi_complete_cmd(cmd);
386 static int vhost_scsi_queue_status(struct se_cmd *se_cmd)
388 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
389 struct vhost_scsi_cmd, tvc_se_cmd);
390 vhost_scsi_complete_cmd(cmd);
394 static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd)
399 static void vhost_scsi_aborted_task(struct se_cmd *se_cmd)
404 static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
410 static struct vhost_scsi_evt *
411 vhost_scsi_allocate_evt(struct vhost_scsi *vs,
412 u32 event, u32 reason)
414 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
415 struct vhost_scsi_evt *evt;
417 if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
418 vs->vs_events_missed = true;
422 evt = kzalloc(sizeof(*evt), GFP_KERNEL);
424 vq_err(vq, "Failed to allocate vhost_scsi_evt\n");
425 vs->vs_events_missed = true;
429 evt->event.event = cpu_to_vhost32(vq, event);
430 evt->event.reason = cpu_to_vhost32(vq, reason);
436 static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd)
438 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
440 /* TODO locking against target/backend threads? */
441 transport_generic_free_cmd(se_cmd, 0);
445 static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
447 return target_put_sess_cmd(se_cmd);
451 vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
453 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
454 struct virtio_scsi_event *event = &evt->event;
455 struct virtio_scsi_event __user *eventp;
459 if (!vq->private_data) {
460 vs->vs_events_missed = true;
465 vhost_disable_notify(&vs->dev, vq);
466 head = vhost_get_vq_desc(vq, vq->iov,
467 ARRAY_SIZE(vq->iov), &out, &in,
470 vs->vs_events_missed = true;
473 if (head == vq->num) {
474 if (vhost_enable_notify(&vs->dev, vq))
476 vs->vs_events_missed = true;
480 if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
481 vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
482 vq->iov[out].iov_len);
483 vs->vs_events_missed = true;
487 if (vs->vs_events_missed) {
488 event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED);
489 vs->vs_events_missed = false;
492 eventp = vq->iov[out].iov_base;
493 ret = __copy_to_user(eventp, event, sizeof(*event));
495 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
497 vq_err(vq, "Faulted on vhost_scsi_send_event\n");
500 static void vhost_scsi_evt_work(struct vhost_work *work)
502 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
504 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
505 struct vhost_scsi_evt *evt;
506 struct llist_node *llnode;
508 mutex_lock(&vq->mutex);
509 llnode = llist_del_all(&vs->vs_event_list);
511 evt = llist_entry(llnode, struct vhost_scsi_evt, list);
512 llnode = llist_next(llnode);
513 vhost_scsi_do_evt_work(vs, evt);
514 vhost_scsi_free_evt(vs, evt);
516 mutex_unlock(&vq->mutex);
519 /* Fill in status and signal that we are done processing this command
521 * This is scheduled in the vhost work queue so we are called with the owner
522 * process mm and can access the vring.
524 static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
526 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
528 DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
529 struct virtio_scsi_cmd_resp v_rsp;
530 struct vhost_scsi_cmd *cmd;
531 struct llist_node *llnode;
532 struct se_cmd *se_cmd;
533 struct iov_iter iov_iter;
536 bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
537 llnode = llist_del_all(&vs->vs_completion_list);
539 cmd = llist_entry(llnode, struct vhost_scsi_cmd,
540 tvc_completion_list);
541 llnode = llist_next(llnode);
542 se_cmd = &cmd->tvc_se_cmd;
544 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
545 cmd, se_cmd->residual_count, se_cmd->scsi_status);
547 memset(&v_rsp, 0, sizeof(v_rsp));
548 v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count);
549 /* TODO is status_qualifier field needed? */
550 v_rsp.status = se_cmd->scsi_status;
551 v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq,
552 se_cmd->scsi_sense_length);
553 memcpy(v_rsp.sense, cmd->tvc_sense_buf,
554 se_cmd->scsi_sense_length);
556 iov_iter_init(&iov_iter, READ, &cmd->tvc_resp_iov,
557 cmd->tvc_in_iovs, sizeof(v_rsp));
558 ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter);
559 if (likely(ret == sizeof(v_rsp))) {
560 struct vhost_scsi_virtqueue *q;
561 vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
562 q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
564 __set_bit(vq, signal);
566 pr_err("Faulted on virtio_scsi_cmd_resp\n");
568 vhost_scsi_free_cmd(cmd);
572 while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
574 vhost_signal(&vs->dev, &vs->vqs[vq].vq);
577 static struct vhost_scsi_cmd *
578 vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg,
579 unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
580 u32 exp_data_len, int data_direction)
582 struct vhost_scsi_cmd *cmd;
583 struct vhost_scsi_nexus *tv_nexus;
584 struct se_session *se_sess;
585 struct scatterlist *sg, *prot_sg;
589 tv_nexus = tpg->tpg_nexus;
591 pr_err("Unable to locate active struct vhost_scsi_nexus\n");
592 return ERR_PTR(-EIO);
594 se_sess = tv_nexus->tvn_se_sess;
596 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING);
598 pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
599 return ERR_PTR(-ENOMEM);
602 cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag];
604 prot_sg = cmd->tvc_prot_sgl;
605 pages = cmd->tvc_upages;
606 memset(cmd, 0, sizeof(struct vhost_scsi_cmd));
609 cmd->tvc_prot_sgl = prot_sg;
610 cmd->tvc_upages = pages;
611 cmd->tvc_se_cmd.map_tag = tag;
612 cmd->tvc_tag = scsi_tag;
614 cmd->tvc_task_attr = task_attr;
615 cmd->tvc_exp_data_len = exp_data_len;
616 cmd->tvc_data_direction = data_direction;
617 cmd->tvc_nexus = tv_nexus;
618 cmd->inflight = vhost_scsi_get_inflight(vq);
620 memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE);
626 * Map a user memory range into a scatterlist
628 * Returns the number of scatterlist entries used or -errno on error.
631 vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd,
634 struct scatterlist *sgl,
637 unsigned int npages = 0, offset, nbytes;
638 unsigned int pages_nr = iov_num_pages(ptr, len);
639 struct scatterlist *sg = sgl;
640 struct page **pages = cmd->tvc_upages;
643 if (pages_nr > VHOST_SCSI_PREALLOC_UPAGES) {
644 pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
645 " preallocated VHOST_SCSI_PREALLOC_UPAGES: %u\n",
646 pages_nr, VHOST_SCSI_PREALLOC_UPAGES);
650 ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
651 /* No pages were pinned */
654 /* Less pages pinned than wanted */
655 if (ret != pages_nr) {
656 for (i = 0; i < ret; i++)
663 offset = (uintptr_t)ptr & ~PAGE_MASK;
664 nbytes = min_t(unsigned int, PAGE_SIZE - offset, len);
665 sg_set_page(sg, pages[npages], nbytes, offset);
677 vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls)
681 if (!iter || !iter->iov) {
682 pr_err("%s: iter->iov is NULL, but expected bytes: %zu"
683 " present\n", __func__, bytes);
687 sgl_count = iov_iter_npages(iter, 0xffff);
688 if (sgl_count > max_sgls) {
689 pr_err("%s: requested sgl_count: %d exceeds pre-allocated"
690 " max_sgls: %d\n", __func__, sgl_count, max_sgls);
697 vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write,
698 struct iov_iter *iter,
699 struct scatterlist *sg, int sg_count)
701 size_t off = iter->iov_offset;
702 struct scatterlist *p = sg;
705 for (i = 0; i < iter->nr_segs; i++) {
706 void __user *base = iter->iov[i].iov_base + off;
707 size_t len = iter->iov[i].iov_len - off;
709 ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write);
712 struct page *page = sg_page(p++);
725 vhost_scsi_mapal(struct vhost_scsi_cmd *cmd,
726 size_t prot_bytes, struct iov_iter *prot_iter,
727 size_t data_bytes, struct iov_iter *data_iter)
730 bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE);
733 sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes,
734 VHOST_SCSI_PREALLOC_PROT_SGLS);
738 sg_init_table(cmd->tvc_prot_sgl, sgl_count);
739 cmd->tvc_prot_sgl_count = sgl_count;
740 pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
741 cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count);
743 ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter,
745 cmd->tvc_prot_sgl_count);
747 cmd->tvc_prot_sgl_count = 0;
751 sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes,
752 VHOST_SCSI_PREALLOC_SGLS);
756 sg_init_table(cmd->tvc_sgl, sgl_count);
757 cmd->tvc_sgl_count = sgl_count;
758 pr_debug("%s data_sg %p data_sgl_count %u\n", __func__,
759 cmd->tvc_sgl, cmd->tvc_sgl_count);
761 ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter,
762 cmd->tvc_sgl, cmd->tvc_sgl_count);
764 cmd->tvc_sgl_count = 0;
770 static int vhost_scsi_to_tcm_attr(int attr)
773 case VIRTIO_SCSI_S_SIMPLE:
774 return TCM_SIMPLE_TAG;
775 case VIRTIO_SCSI_S_ORDERED:
776 return TCM_ORDERED_TAG;
777 case VIRTIO_SCSI_S_HEAD:
779 case VIRTIO_SCSI_S_ACA:
784 return TCM_SIMPLE_TAG;
787 static void vhost_scsi_submission_work(struct work_struct *work)
789 struct vhost_scsi_cmd *cmd =
790 container_of(work, struct vhost_scsi_cmd, work);
791 struct vhost_scsi_nexus *tv_nexus;
792 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
793 struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
796 /* FIXME: BIDI operation */
797 if (cmd->tvc_sgl_count) {
798 sg_ptr = cmd->tvc_sgl;
800 if (cmd->tvc_prot_sgl_count)
801 sg_prot_ptr = cmd->tvc_prot_sgl;
803 se_cmd->prot_pto = true;
807 tv_nexus = cmd->tvc_nexus;
810 rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
811 cmd->tvc_cdb, &cmd->tvc_sense_buf[0],
812 cmd->tvc_lun, cmd->tvc_exp_data_len,
813 vhost_scsi_to_tcm_attr(cmd->tvc_task_attr),
814 cmd->tvc_data_direction, TARGET_SCF_ACK_KREF,
815 sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr,
816 cmd->tvc_prot_sgl_count);
818 transport_send_check_condition_and_sense(se_cmd,
819 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
820 transport_generic_free_cmd(se_cmd, 0);
825 vhost_scsi_send_bad_target(struct vhost_scsi *vs,
826 struct vhost_virtqueue *vq,
827 int head, unsigned out)
829 struct virtio_scsi_cmd_resp __user *resp;
830 struct virtio_scsi_cmd_resp rsp;
833 memset(&rsp, 0, sizeof(rsp));
834 rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
835 resp = vq->iov[out].iov_base;
836 ret = __copy_to_user(resp, &rsp, sizeof(rsp));
838 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
840 pr_err("Faulted on virtio_scsi_cmd_resp\n");
844 vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
846 struct vhost_scsi_tpg **vs_tpg, *tpg;
847 struct virtio_scsi_cmd_req v_req;
848 struct virtio_scsi_cmd_req_pi v_req_pi;
849 struct vhost_scsi_cmd *cmd;
850 struct iov_iter out_iter, in_iter, prot_iter, data_iter;
852 u32 exp_data_len, data_direction;
854 int head, ret, prot_bytes, c = 0;
855 size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp);
856 size_t out_size, in_size;
858 u8 *target, *lunp, task_attr;
859 bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI);
862 mutex_lock(&vq->mutex);
864 * We can handle the vq only after the endpoint is setup by calling the
865 * VHOST_SCSI_SET_ENDPOINT ioctl.
867 vs_tpg = vq->private_data;
871 vhost_disable_notify(&vs->dev, vq);
874 head = vhost_get_vq_desc(vq, vq->iov,
875 ARRAY_SIZE(vq->iov), &out, &in,
877 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
879 /* On error, stop handling until the next kick. */
880 if (unlikely(head < 0))
882 /* Nothing new? Wait for eventfd to tell us they refilled. */
883 if (head == vq->num) {
884 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
885 vhost_disable_notify(&vs->dev, vq);
891 * Check for a sane response buffer so we can report early
892 * errors back to the guest.
894 if (unlikely(vq->iov[out].iov_len < rsp_size)) {
895 vq_err(vq, "Expecting at least virtio_scsi_cmd_resp"
896 " size, got %zu bytes\n", vq->iov[out].iov_len);
900 * Setup pointers and values based upon different virtio-scsi
901 * request header if T10_PI is enabled in KVM guest.
905 req_size = sizeof(v_req_pi);
906 lunp = &v_req_pi.lun[0];
907 target = &v_req_pi.lun[1];
910 req_size = sizeof(v_req);
911 lunp = &v_req.lun[0];
912 target = &v_req.lun[1];
915 * FIXME: Not correct for BIDI operation
917 out_size = iov_length(vq->iov, out);
918 in_size = iov_length(&vq->iov[out], in);
921 * Copy over the virtio-scsi request header, which for a
922 * ANY_LAYOUT enabled guest may span multiple iovecs, or a
923 * single iovec may contain both the header + outgoing
926 * copy_from_iter() will advance out_iter, so that it will
927 * point at the start of the outgoing WRITE payload, if
928 * DMA_TO_DEVICE is set.
930 iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size);
932 ret = copy_from_iter(req, req_size, &out_iter);
933 if (unlikely(ret != req_size)) {
934 vq_err(vq, "Faulted on copy_from_iter\n");
935 vhost_scsi_send_bad_target(vs, vq, head, out);
938 /* virtio-scsi spec requires byte 0 of the lun to be 1 */
939 if (unlikely(*lunp != 1)) {
940 vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp);
941 vhost_scsi_send_bad_target(vs, vq, head, out);
945 tpg = ACCESS_ONCE(vs_tpg[*target]);
946 if (unlikely(!tpg)) {
947 /* Target does not exist, fail the request */
948 vhost_scsi_send_bad_target(vs, vq, head, out);
952 * Determine data_direction by calculating the total outgoing
953 * iovec sizes + incoming iovec sizes vs. virtio-scsi request +
954 * response headers respectively.
956 * For DMA_TO_DEVICE this is out_iter, which is already pointing
957 * to the right place.
959 * For DMA_FROM_DEVICE, the iovec will be just past the end
960 * of the virtio-scsi response header in either the same
961 * or immediately following iovec.
963 * Any associated T10_PI bytes for the outgoing / incoming
964 * payloads are included in calculation of exp_data_len here.
968 if (out_size > req_size) {
969 data_direction = DMA_TO_DEVICE;
970 exp_data_len = out_size - req_size;
971 data_iter = out_iter;
972 } else if (in_size > rsp_size) {
973 data_direction = DMA_FROM_DEVICE;
974 exp_data_len = in_size - rsp_size;
976 iov_iter_init(&in_iter, READ, &vq->iov[out], in,
977 rsp_size + exp_data_len);
978 iov_iter_advance(&in_iter, rsp_size);
981 data_direction = DMA_NONE;
985 * If T10_PI header + payload is present, setup prot_iter values
986 * and recalculate data_iter for vhost_scsi_mapal() mapping to
987 * host scatterlists via get_user_pages_fast().
990 if (v_req_pi.pi_bytesout) {
991 if (data_direction != DMA_TO_DEVICE) {
992 vq_err(vq, "Received non zero pi_bytesout,"
993 " but wrong data_direction\n");
994 vhost_scsi_send_bad_target(vs, vq, head, out);
997 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout);
998 } else if (v_req_pi.pi_bytesin) {
999 if (data_direction != DMA_FROM_DEVICE) {
1000 vq_err(vq, "Received non zero pi_bytesin,"
1001 " but wrong data_direction\n");
1002 vhost_scsi_send_bad_target(vs, vq, head, out);
1005 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin);
1008 * Set prot_iter to data_iter and truncate it to
1009 * prot_bytes, and advance data_iter past any
1010 * preceeding prot_bytes that may be present.
1012 * Also fix up the exp_data_len to reflect only the
1013 * actual data payload length.
1016 exp_data_len -= prot_bytes;
1017 prot_iter = data_iter;
1018 iov_iter_truncate(&prot_iter, prot_bytes);
1019 iov_iter_advance(&data_iter, prot_bytes);
1021 tag = vhost64_to_cpu(vq, v_req_pi.tag);
1022 task_attr = v_req_pi.task_attr;
1023 cdb = &v_req_pi.cdb[0];
1024 lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
1026 tag = vhost64_to_cpu(vq, v_req.tag);
1027 task_attr = v_req.task_attr;
1028 cdb = &v_req.cdb[0];
1029 lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
1032 * Check that the received CDB size does not exceeded our
1033 * hardcoded max for vhost-scsi, then get a pre-allocated
1034 * cmd descriptor for the new virtio-scsi tag.
1036 * TODO what if cdb was too small for varlen cdb header?
1038 if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) {
1039 vq_err(vq, "Received SCSI CDB with command_size: %d that"
1040 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1041 scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE);
1042 vhost_scsi_send_bad_target(vs, vq, head, out);
1045 cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr,
1046 exp_data_len + prot_bytes,
1049 vq_err(vq, "vhost_scsi_get_tag failed %ld\n",
1051 vhost_scsi_send_bad_target(vs, vq, head, out);
1054 cmd->tvc_vhost = vs;
1056 cmd->tvc_resp_iov = vq->iov[out];
1057 cmd->tvc_in_iovs = in;
1059 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
1060 cmd->tvc_cdb[0], cmd->tvc_lun);
1061 pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:"
1062 " %d\n", cmd, exp_data_len, prot_bytes, data_direction);
1064 if (data_direction != DMA_NONE) {
1065 ret = vhost_scsi_mapal(cmd,
1066 prot_bytes, &prot_iter,
1067 exp_data_len, &data_iter);
1068 if (unlikely(ret)) {
1069 vq_err(vq, "Failed to map iov to sgl\n");
1070 vhost_scsi_release_cmd(&cmd->tvc_se_cmd);
1071 vhost_scsi_send_bad_target(vs, vq, head, out);
1076 * Save the descriptor from vhost_get_vq_desc() to be used to
1077 * complete the virtio-scsi request in TCM callback context via
1078 * vhost_scsi_queue_data_in() and vhost_scsi_queue_status()
1080 cmd->tvc_vq_desc = head;
1082 * Dispatch cmd descriptor for cmwq execution in process
1083 * context provided by vhost_scsi_workqueue. This also ensures
1084 * cmd is executed on the same kworker CPU as this vhost
1085 * thread to gain positive L2 cache locality effects.
1087 INIT_WORK(&cmd->work, vhost_scsi_submission_work);
1088 queue_work(vhost_scsi_workqueue, &cmd->work);
1089 } while (likely(!vhost_exceeds_weight(vq, ++c, 0)));
1091 mutex_unlock(&vq->mutex);
1094 static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
1096 pr_debug("%s: The handling func for control queue.\n", __func__);
1100 vhost_scsi_send_evt(struct vhost_scsi *vs,
1101 struct vhost_scsi_tpg *tpg,
1106 struct vhost_scsi_evt *evt;
1108 evt = vhost_scsi_allocate_evt(vs, event, reason);
1113 /* TODO: share lun setup code with virtio-scsi.ko */
1115 * Note: evt->event is zeroed when we allocate it and
1116 * lun[4-7] need to be zero according to virtio-scsi spec.
1118 evt->event.lun[0] = 0x01;
1119 evt->event.lun[1] = tpg->tport_tpgt;
1120 if (lun->unpacked_lun >= 256)
1121 evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
1122 evt->event.lun[3] = lun->unpacked_lun & 0xFF;
1125 llist_add(&evt->list, &vs->vs_event_list);
1126 vhost_work_queue(&vs->dev, &vs->vs_event_work);
1129 static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
1131 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1133 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1135 mutex_lock(&vq->mutex);
1136 if (!vq->private_data)
1139 if (vs->vs_events_missed)
1140 vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
1142 mutex_unlock(&vq->mutex);
1145 static void vhost_scsi_handle_kick(struct vhost_work *work)
1147 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1149 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1151 vhost_scsi_handle_vq(vs, vq);
1154 static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
1156 vhost_poll_flush(&vs->vqs[index].vq.poll);
1159 /* Callers must hold dev mutex */
1160 static void vhost_scsi_flush(struct vhost_scsi *vs)
1162 struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];
1165 /* Init new inflight and remember the old inflight */
1166 vhost_scsi_init_inflight(vs, old_inflight);
1169 * The inflight->kref was initialized to 1. We decrement it here to
1170 * indicate the start of the flush operation so that it will reach 0
1171 * when all the reqs are finished.
1173 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1174 kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight);
1176 /* Flush both the vhost poll and vhost work */
1177 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1178 vhost_scsi_flush_vq(vs, i);
1179 vhost_work_flush(&vs->dev, &vs->vs_completion_work);
1180 vhost_work_flush(&vs->dev, &vs->vs_event_work);
1182 /* Wait for all reqs issued before the flush to be finished */
1183 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1184 wait_for_completion(&old_inflight[i]->comp);
1188 * Called from vhost_scsi_ioctl() context to walk the list of available
1189 * vhost_scsi_tpg with an active struct vhost_scsi_nexus
1191 * The lock nesting rule is:
1192 * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
1195 vhost_scsi_set_endpoint(struct vhost_scsi *vs,
1196 struct vhost_scsi_target *t)
1198 struct se_portal_group *se_tpg;
1199 struct vhost_scsi_tport *tv_tport;
1200 struct vhost_scsi_tpg *tpg;
1201 struct vhost_scsi_tpg **vs_tpg;
1202 struct vhost_virtqueue *vq;
1203 int index, ret, i, len;
1206 mutex_lock(&vhost_scsi_mutex);
1207 mutex_lock(&vs->dev.mutex);
1209 /* Verify that ring has been setup correctly. */
1210 for (index = 0; index < vs->dev.nvqs; ++index) {
1211 /* Verify that ring has been setup correctly. */
1212 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1218 len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
1219 vs_tpg = kzalloc(len, GFP_KERNEL);
1225 memcpy(vs_tpg, vs->vs_tpg, len);
1227 list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) {
1228 mutex_lock(&tpg->tv_tpg_mutex);
1229 if (!tpg->tpg_nexus) {
1230 mutex_unlock(&tpg->tv_tpg_mutex);
1233 if (tpg->tv_tpg_vhost_count != 0) {
1234 mutex_unlock(&tpg->tv_tpg_mutex);
1237 tv_tport = tpg->tport;
1239 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1240 if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
1242 mutex_unlock(&tpg->tv_tpg_mutex);
1247 * In order to ensure individual vhost-scsi configfs
1248 * groups cannot be removed while in use by vhost ioctl,
1249 * go ahead and take an explicit se_tpg->tpg_group.cg_item
1252 se_tpg = &tpg->se_tpg;
1253 ret = target_depend_item(&se_tpg->tpg_group.cg_item);
1255 pr_warn("configfs_depend_item() failed: %d\n", ret);
1257 mutex_unlock(&tpg->tv_tpg_mutex);
1260 tpg->tv_tpg_vhost_count++;
1261 tpg->vhost_scsi = vs;
1262 vs_tpg[tpg->tport_tpgt] = tpg;
1263 smp_mb__after_atomic();
1266 mutex_unlock(&tpg->tv_tpg_mutex);
1270 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1271 sizeof(vs->vs_vhost_wwpn));
1272 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1273 vq = &vs->vqs[i].vq;
1274 mutex_lock(&vq->mutex);
1275 vq->private_data = vs_tpg;
1276 vhost_vq_init_access(vq);
1277 mutex_unlock(&vq->mutex);
1285 * Act as synchronize_rcu to make sure access to
1286 * old vs->vs_tpg is finished.
1288 vhost_scsi_flush(vs);
1290 vs->vs_tpg = vs_tpg;
1293 mutex_unlock(&vs->dev.mutex);
1294 mutex_unlock(&vhost_scsi_mutex);
1299 vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
1300 struct vhost_scsi_target *t)
1302 struct se_portal_group *se_tpg;
1303 struct vhost_scsi_tport *tv_tport;
1304 struct vhost_scsi_tpg *tpg;
1305 struct vhost_virtqueue *vq;
1310 mutex_lock(&vhost_scsi_mutex);
1311 mutex_lock(&vs->dev.mutex);
1312 /* Verify that ring has been setup correctly. */
1313 for (index = 0; index < vs->dev.nvqs; ++index) {
1314 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1325 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1327 tpg = vs->vs_tpg[target];
1331 mutex_lock(&tpg->tv_tpg_mutex);
1332 tv_tport = tpg->tport;
1338 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1339 pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
1340 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
1341 tv_tport->tport_name, tpg->tport_tpgt,
1342 t->vhost_wwpn, t->vhost_tpgt);
1346 tpg->tv_tpg_vhost_count--;
1347 tpg->vhost_scsi = NULL;
1348 vs->vs_tpg[target] = NULL;
1350 mutex_unlock(&tpg->tv_tpg_mutex);
1352 * Release se_tpg->tpg_group.cg_item configfs dependency now
1353 * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur.
1355 se_tpg = &tpg->se_tpg;
1356 target_undepend_item(&se_tpg->tpg_group.cg_item);
1359 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1360 vq = &vs->vqs[i].vq;
1361 mutex_lock(&vq->mutex);
1362 vq->private_data = NULL;
1363 mutex_unlock(&vq->mutex);
1367 * Act as synchronize_rcu to make sure access to
1368 * old vs->vs_tpg is finished.
1370 vhost_scsi_flush(vs);
1373 WARN_ON(vs->vs_events_nr);
1374 mutex_unlock(&vs->dev.mutex);
1375 mutex_unlock(&vhost_scsi_mutex);
1379 mutex_unlock(&tpg->tv_tpg_mutex);
1381 mutex_unlock(&vs->dev.mutex);
1382 mutex_unlock(&vhost_scsi_mutex);
1386 static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1388 struct vhost_virtqueue *vq;
1391 if (features & ~VHOST_SCSI_FEATURES)
1394 mutex_lock(&vs->dev.mutex);
1395 if ((features & (1 << VHOST_F_LOG_ALL)) &&
1396 !vhost_log_access_ok(&vs->dev)) {
1397 mutex_unlock(&vs->dev.mutex);
1401 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1402 vq = &vs->vqs[i].vq;
1403 mutex_lock(&vq->mutex);
1404 vq->acked_features = features;
1405 mutex_unlock(&vq->mutex);
1407 mutex_unlock(&vs->dev.mutex);
1411 static int vhost_scsi_open(struct inode *inode, struct file *f)
1413 struct vhost_scsi *vs;
1414 struct vhost_virtqueue **vqs;
1417 vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
1419 vs = vzalloc(sizeof(*vs));
1424 vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL);
1428 vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);
1429 vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);
1431 vs->vs_events_nr = 0;
1432 vs->vs_events_missed = false;
1434 vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
1435 vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1436 vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1437 vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
1438 for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
1439 vqs[i] = &vs->vqs[i].vq;
1440 vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
1442 vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ,
1443 VHOST_SCSI_WEIGHT, 0);
1445 vhost_scsi_init_inflight(vs, NULL);
1447 f->private_data = vs;
1456 static int vhost_scsi_release(struct inode *inode, struct file *f)
1458 struct vhost_scsi *vs = f->private_data;
1459 struct vhost_scsi_target t;
1461 mutex_lock(&vs->dev.mutex);
1462 memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
1463 mutex_unlock(&vs->dev.mutex);
1464 vhost_scsi_clear_endpoint(vs, &t);
1465 vhost_dev_stop(&vs->dev);
1466 vhost_dev_cleanup(&vs->dev, false);
1467 /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
1468 vhost_scsi_flush(vs);
1475 vhost_scsi_ioctl(struct file *f,
1479 struct vhost_scsi *vs = f->private_data;
1480 struct vhost_scsi_target backend;
1481 void __user *argp = (void __user *)arg;
1482 u64 __user *featurep = argp;
1483 u32 __user *eventsp = argp;
1486 int r, abi_version = VHOST_SCSI_ABI_VERSION;
1487 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1490 case VHOST_SCSI_SET_ENDPOINT:
1491 if (copy_from_user(&backend, argp, sizeof backend))
1493 if (backend.reserved != 0)
1496 return vhost_scsi_set_endpoint(vs, &backend);
1497 case VHOST_SCSI_CLEAR_ENDPOINT:
1498 if (copy_from_user(&backend, argp, sizeof backend))
1500 if (backend.reserved != 0)
1503 return vhost_scsi_clear_endpoint(vs, &backend);
1504 case VHOST_SCSI_GET_ABI_VERSION:
1505 if (copy_to_user(argp, &abi_version, sizeof abi_version))
1508 case VHOST_SCSI_SET_EVENTS_MISSED:
1509 if (get_user(events_missed, eventsp))
1511 mutex_lock(&vq->mutex);
1512 vs->vs_events_missed = events_missed;
1513 mutex_unlock(&vq->mutex);
1515 case VHOST_SCSI_GET_EVENTS_MISSED:
1516 mutex_lock(&vq->mutex);
1517 events_missed = vs->vs_events_missed;
1518 mutex_unlock(&vq->mutex);
1519 if (put_user(events_missed, eventsp))
1522 case VHOST_GET_FEATURES:
1523 features = VHOST_SCSI_FEATURES;
1524 if (copy_to_user(featurep, &features, sizeof features))
1527 case VHOST_SET_FEATURES:
1528 if (copy_from_user(&features, featurep, sizeof features))
1530 return vhost_scsi_set_features(vs, features);
1532 mutex_lock(&vs->dev.mutex);
1533 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
1534 /* TODO: flush backend after dev ioctl. */
1535 if (r == -ENOIOCTLCMD)
1536 r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
1537 mutex_unlock(&vs->dev.mutex);
1542 #ifdef CONFIG_COMPAT
1543 static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
1546 return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
1550 static const struct file_operations vhost_scsi_fops = {
1551 .owner = THIS_MODULE,
1552 .release = vhost_scsi_release,
1553 .unlocked_ioctl = vhost_scsi_ioctl,
1554 #ifdef CONFIG_COMPAT
1555 .compat_ioctl = vhost_scsi_compat_ioctl,
1557 .open = vhost_scsi_open,
1558 .llseek = noop_llseek,
1561 static struct miscdevice vhost_scsi_misc = {
1567 static int __init vhost_scsi_register(void)
1569 return misc_register(&vhost_scsi_misc);
1572 static void vhost_scsi_deregister(void)
1574 misc_deregister(&vhost_scsi_misc);
1577 static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport)
1579 switch (tport->tport_proto_id) {
1580 case SCSI_PROTOCOL_SAS:
1582 case SCSI_PROTOCOL_FCP:
1584 case SCSI_PROTOCOL_ISCSI:
1594 vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg,
1595 struct se_lun *lun, bool plug)
1598 struct vhost_scsi *vs = tpg->vhost_scsi;
1599 struct vhost_virtqueue *vq;
1605 mutex_lock(&vs->dev.mutex);
1608 reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
1610 reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
1612 vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1613 mutex_lock(&vq->mutex);
1614 if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG))
1615 vhost_scsi_send_evt(vs, tpg, lun,
1616 VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
1617 mutex_unlock(&vq->mutex);
1618 mutex_unlock(&vs->dev.mutex);
1621 static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1623 vhost_scsi_do_plug(tpg, lun, true);
1626 static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1628 vhost_scsi_do_plug(tpg, lun, false);
1631 static int vhost_scsi_port_link(struct se_portal_group *se_tpg,
1634 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1635 struct vhost_scsi_tpg, se_tpg);
1637 mutex_lock(&vhost_scsi_mutex);
1639 mutex_lock(&tpg->tv_tpg_mutex);
1640 tpg->tv_tpg_port_count++;
1641 mutex_unlock(&tpg->tv_tpg_mutex);
1643 vhost_scsi_hotplug(tpg, lun);
1645 mutex_unlock(&vhost_scsi_mutex);
1650 static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
1653 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1654 struct vhost_scsi_tpg, se_tpg);
1656 mutex_lock(&vhost_scsi_mutex);
1658 mutex_lock(&tpg->tv_tpg_mutex);
1659 tpg->tv_tpg_port_count--;
1660 mutex_unlock(&tpg->tv_tpg_mutex);
1662 vhost_scsi_hotunplug(tpg, lun);
1664 mutex_unlock(&vhost_scsi_mutex);
1667 static void vhost_scsi_free_cmd_map_res(struct se_session *se_sess)
1669 struct vhost_scsi_cmd *tv_cmd;
1672 if (!se_sess->sess_cmd_map)
1675 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1676 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1678 kfree(tv_cmd->tvc_sgl);
1679 kfree(tv_cmd->tvc_prot_sgl);
1680 kfree(tv_cmd->tvc_upages);
1684 static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store(
1685 struct config_item *item, const char *page, size_t count)
1687 struct se_portal_group *se_tpg = attrib_to_tpg(item);
1688 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1689 struct vhost_scsi_tpg, se_tpg);
1691 int ret = kstrtoul(page, 0, &val);
1694 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
1697 if (val != 0 && val != 1 && val != 3) {
1698 pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val);
1701 tpg->tv_fabric_prot_type = val;
1706 static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show(
1707 struct config_item *item, char *page)
1709 struct se_portal_group *se_tpg = attrib_to_tpg(item);
1710 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1711 struct vhost_scsi_tpg, se_tpg);
1713 return sprintf(page, "%d\n", tpg->tv_fabric_prot_type);
1716 CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type);
1718 static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = {
1719 &vhost_scsi_tpg_attrib_attr_fabric_prot_type,
1723 static int vhost_scsi_nexus_cb(struct se_portal_group *se_tpg,
1724 struct se_session *se_sess, void *p)
1726 struct vhost_scsi_cmd *tv_cmd;
1729 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1730 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1732 tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) *
1733 VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL);
1734 if (!tv_cmd->tvc_sgl) {
1735 pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
1739 tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) *
1740 VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL);
1741 if (!tv_cmd->tvc_upages) {
1742 pr_err("Unable to allocate tv_cmd->tvc_upages\n");
1746 tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) *
1747 VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL);
1748 if (!tv_cmd->tvc_prot_sgl) {
1749 pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
1755 vhost_scsi_free_cmd_map_res(se_sess);
1759 static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
1762 struct se_portal_group *se_tpg;
1763 struct vhost_scsi_nexus *tv_nexus;
1765 mutex_lock(&tpg->tv_tpg_mutex);
1766 if (tpg->tpg_nexus) {
1767 mutex_unlock(&tpg->tv_tpg_mutex);
1768 pr_debug("tpg->tpg_nexus already exists\n");
1771 se_tpg = &tpg->se_tpg;
1773 tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL);
1775 mutex_unlock(&tpg->tv_tpg_mutex);
1776 pr_err("Unable to allocate struct vhost_scsi_nexus\n");
1780 * Since we are running in 'demo mode' this call with generate a
1781 * struct se_node_acl for the vhost_scsi struct se_portal_group with
1782 * the SCSI Initiator port name of the passed configfs group 'name'.
1784 tv_nexus->tvn_se_sess = target_alloc_session(&tpg->se_tpg,
1785 VHOST_SCSI_DEFAULT_TAGS,
1786 sizeof(struct vhost_scsi_cmd),
1787 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
1788 (unsigned char *)name, tv_nexus,
1789 vhost_scsi_nexus_cb);
1790 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1791 mutex_unlock(&tpg->tv_tpg_mutex);
1795 tpg->tpg_nexus = tv_nexus;
1797 mutex_unlock(&tpg->tv_tpg_mutex);
1801 static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
1803 struct se_session *se_sess;
1804 struct vhost_scsi_nexus *tv_nexus;
1806 mutex_lock(&tpg->tv_tpg_mutex);
1807 tv_nexus = tpg->tpg_nexus;
1809 mutex_unlock(&tpg->tv_tpg_mutex);
1813 se_sess = tv_nexus->tvn_se_sess;
1815 mutex_unlock(&tpg->tv_tpg_mutex);
1819 if (tpg->tv_tpg_port_count != 0) {
1820 mutex_unlock(&tpg->tv_tpg_mutex);
1821 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1822 " active TPG port count: %d\n",
1823 tpg->tv_tpg_port_count);
1827 if (tpg->tv_tpg_vhost_count != 0) {
1828 mutex_unlock(&tpg->tv_tpg_mutex);
1829 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1830 " active TPG vhost count: %d\n",
1831 tpg->tv_tpg_vhost_count);
1835 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
1836 " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport),
1837 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1839 vhost_scsi_free_cmd_map_res(se_sess);
1841 * Release the SCSI I_T Nexus to the emulated vhost Target Port
1843 transport_deregister_session(tv_nexus->tvn_se_sess);
1844 tpg->tpg_nexus = NULL;
1845 mutex_unlock(&tpg->tv_tpg_mutex);
1851 static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page)
1853 struct se_portal_group *se_tpg = to_tpg(item);
1854 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1855 struct vhost_scsi_tpg, se_tpg);
1856 struct vhost_scsi_nexus *tv_nexus;
1859 mutex_lock(&tpg->tv_tpg_mutex);
1860 tv_nexus = tpg->tpg_nexus;
1862 mutex_unlock(&tpg->tv_tpg_mutex);
1865 ret = snprintf(page, PAGE_SIZE, "%s\n",
1866 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1867 mutex_unlock(&tpg->tv_tpg_mutex);
1872 static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item,
1873 const char *page, size_t count)
1875 struct se_portal_group *se_tpg = to_tpg(item);
1876 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1877 struct vhost_scsi_tpg, se_tpg);
1878 struct vhost_scsi_tport *tport_wwn = tpg->tport;
1879 unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr;
1882 * Shutdown the active I_T nexus if 'NULL' is passed..
1884 if (!strncmp(page, "NULL", 4)) {
1885 ret = vhost_scsi_drop_nexus(tpg);
1886 return (!ret) ? count : ret;
1889 * Otherwise make sure the passed virtual Initiator port WWN matches
1890 * the fabric protocol_id set in vhost_scsi_make_tport(), and call
1891 * vhost_scsi_make_nexus().
1893 if (strlen(page) >= VHOST_SCSI_NAMELEN) {
1894 pr_err("Emulated NAA Sas Address: %s, exceeds"
1895 " max: %d\n", page, VHOST_SCSI_NAMELEN);
1898 snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page);
1900 ptr = strstr(i_port, "naa.");
1902 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1903 pr_err("Passed SAS Initiator Port %s does not"
1904 " match target port protoid: %s\n", i_port,
1905 vhost_scsi_dump_proto_id(tport_wwn));
1908 port_ptr = &i_port[0];
1911 ptr = strstr(i_port, "fc.");
1913 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1914 pr_err("Passed FCP Initiator Port %s does not"
1915 " match target port protoid: %s\n", i_port,
1916 vhost_scsi_dump_proto_id(tport_wwn));
1919 port_ptr = &i_port[3]; /* Skip over "fc." */
1922 ptr = strstr(i_port, "iqn.");
1924 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1925 pr_err("Passed iSCSI Initiator Port %s does not"
1926 " match target port protoid: %s\n", i_port,
1927 vhost_scsi_dump_proto_id(tport_wwn));
1930 port_ptr = &i_port[0];
1933 pr_err("Unable to locate prefix for emulated Initiator Port:"
1937 * Clear any trailing newline for the NAA WWN
1940 if (i_port[strlen(i_port)-1] == '\n')
1941 i_port[strlen(i_port)-1] = '\0';
1943 ret = vhost_scsi_make_nexus(tpg, port_ptr);
1950 CONFIGFS_ATTR(vhost_scsi_tpg_, nexus);
1952 static struct configfs_attribute *vhost_scsi_tpg_attrs[] = {
1953 &vhost_scsi_tpg_attr_nexus,
1957 static struct se_portal_group *
1958 vhost_scsi_make_tpg(struct se_wwn *wwn,
1959 struct config_group *group,
1962 struct vhost_scsi_tport *tport = container_of(wwn,
1963 struct vhost_scsi_tport, tport_wwn);
1965 struct vhost_scsi_tpg *tpg;
1969 if (strstr(name, "tpgt_") != name)
1970 return ERR_PTR(-EINVAL);
1971 if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET)
1972 return ERR_PTR(-EINVAL);
1974 tpg = kzalloc(sizeof(struct vhost_scsi_tpg), GFP_KERNEL);
1976 pr_err("Unable to allocate struct vhost_scsi_tpg");
1977 return ERR_PTR(-ENOMEM);
1979 mutex_init(&tpg->tv_tpg_mutex);
1980 INIT_LIST_HEAD(&tpg->tv_tpg_list);
1982 tpg->tport_tpgt = tpgt;
1984 ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id);
1989 mutex_lock(&vhost_scsi_mutex);
1990 list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list);
1991 mutex_unlock(&vhost_scsi_mutex);
1993 return &tpg->se_tpg;
1996 static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg)
1998 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1999 struct vhost_scsi_tpg, se_tpg);
2001 mutex_lock(&vhost_scsi_mutex);
2002 list_del(&tpg->tv_tpg_list);
2003 mutex_unlock(&vhost_scsi_mutex);
2005 * Release the virtual I_T Nexus for this vhost TPG
2007 vhost_scsi_drop_nexus(tpg);
2009 * Deregister the se_tpg from TCM..
2011 core_tpg_deregister(se_tpg);
2015 static struct se_wwn *
2016 vhost_scsi_make_tport(struct target_fabric_configfs *tf,
2017 struct config_group *group,
2020 struct vhost_scsi_tport *tport;
2025 /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
2026 return ERR_PTR(-EINVAL); */
2028 tport = kzalloc(sizeof(struct vhost_scsi_tport), GFP_KERNEL);
2030 pr_err("Unable to allocate struct vhost_scsi_tport");
2031 return ERR_PTR(-ENOMEM);
2033 tport->tport_wwpn = wwpn;
2035 * Determine the emulated Protocol Identifier and Target Port Name
2036 * based on the incoming configfs directory name.
2038 ptr = strstr(name, "naa.");
2040 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
2043 ptr = strstr(name, "fc.");
2045 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
2046 off = 3; /* Skip over "fc." */
2049 ptr = strstr(name, "iqn.");
2051 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
2055 pr_err("Unable to locate prefix for emulated Target Port:"
2058 return ERR_PTR(-EINVAL);
2061 if (strlen(name) >= VHOST_SCSI_NAMELEN) {
2062 pr_err("Emulated %s Address: %s, exceeds"
2063 " max: %d\n", name, vhost_scsi_dump_proto_id(tport),
2064 VHOST_SCSI_NAMELEN);
2066 return ERR_PTR(-EINVAL);
2068 snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]);
2070 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
2071 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name);
2073 return &tport->tport_wwn;
2076 static void vhost_scsi_drop_tport(struct se_wwn *wwn)
2078 struct vhost_scsi_tport *tport = container_of(wwn,
2079 struct vhost_scsi_tport, tport_wwn);
2081 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
2082 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport),
2089 vhost_scsi_wwn_version_show(struct config_item *item, char *page)
2091 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
2092 "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2093 utsname()->machine);
2096 CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version);
2098 static struct configfs_attribute *vhost_scsi_wwn_attrs[] = {
2099 &vhost_scsi_wwn_attr_version,
2103 static struct target_core_fabric_ops vhost_scsi_ops = {
2104 .module = THIS_MODULE,
2106 .get_fabric_name = vhost_scsi_get_fabric_name,
2107 .tpg_get_wwn = vhost_scsi_get_fabric_wwn,
2108 .tpg_get_tag = vhost_scsi_get_tpgt,
2109 .tpg_check_demo_mode = vhost_scsi_check_true,
2110 .tpg_check_demo_mode_cache = vhost_scsi_check_true,
2111 .tpg_check_demo_mode_write_protect = vhost_scsi_check_false,
2112 .tpg_check_prod_mode_write_protect = vhost_scsi_check_false,
2113 .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only,
2114 .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index,
2115 .release_cmd = vhost_scsi_release_cmd,
2116 .check_stop_free = vhost_scsi_check_stop_free,
2117 .sess_get_index = vhost_scsi_sess_get_index,
2118 .sess_get_initiator_sid = NULL,
2119 .write_pending = vhost_scsi_write_pending,
2120 .write_pending_status = vhost_scsi_write_pending_status,
2121 .set_default_node_attributes = vhost_scsi_set_default_node_attrs,
2122 .get_cmd_state = vhost_scsi_get_cmd_state,
2123 .queue_data_in = vhost_scsi_queue_data_in,
2124 .queue_status = vhost_scsi_queue_status,
2125 .queue_tm_rsp = vhost_scsi_queue_tm_rsp,
2126 .aborted_task = vhost_scsi_aborted_task,
2128 * Setup callers for generic logic in target_core_fabric_configfs.c
2130 .fabric_make_wwn = vhost_scsi_make_tport,
2131 .fabric_drop_wwn = vhost_scsi_drop_tport,
2132 .fabric_make_tpg = vhost_scsi_make_tpg,
2133 .fabric_drop_tpg = vhost_scsi_drop_tpg,
2134 .fabric_post_link = vhost_scsi_port_link,
2135 .fabric_pre_unlink = vhost_scsi_port_unlink,
2137 .tfc_wwn_attrs = vhost_scsi_wwn_attrs,
2138 .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs,
2139 .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs,
2142 static int __init vhost_scsi_init(void)
2146 pr_debug("TCM_VHOST fabric module %s on %s/%s"
2147 " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2148 utsname()->machine);
2151 * Use our own dedicated workqueue for submitting I/O into
2152 * target core to avoid contention within system_wq.
2154 vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0);
2155 if (!vhost_scsi_workqueue)
2158 ret = vhost_scsi_register();
2160 goto out_destroy_workqueue;
2162 ret = target_register_template(&vhost_scsi_ops);
2164 goto out_vhost_scsi_deregister;
2168 out_vhost_scsi_deregister:
2169 vhost_scsi_deregister();
2170 out_destroy_workqueue:
2171 destroy_workqueue(vhost_scsi_workqueue);
2176 static void vhost_scsi_exit(void)
2178 target_unregister_template(&vhost_scsi_ops);
2179 vhost_scsi_deregister();
2180 destroy_workqueue(vhost_scsi_workqueue);
2183 MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2184 MODULE_ALIAS("tcm_vhost");
2185 MODULE_LICENSE("GPL");
2186 module_init(vhost_scsi_init);
2187 module_exit(vhost_scsi_exit);