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24#include <linux/module.h>
25#include <linux/moduleparam.h>
26#include <generated/utsrelease.h>
27#include <linux/utsname.h>
28#include <linux/init.h>
29#include <linux/slab.h>
30#include <linux/kthread.h>
31#include <linux/types.h>
32#include <linux/string.h>
33#include <linux/configfs.h>
34#include <linux/ctype.h>
35#include <linux/compat.h>
36#include <linux/eventfd.h>
37#include <linux/fs.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>
50
51#include "vhost.h"
52
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
60
61struct vhost_scsi_inflight {
62
63 struct completion comp;
64
65 struct kref kref;
66};
67
68struct vhost_scsi_cmd {
69
70 int tvc_vq_desc;
71
72 int tvc_task_attr;
73
74 int tvc_in_iovs;
75
76 enum dma_data_direction tvc_data_direction;
77
78 u32 tvc_exp_data_len;
79
80 u64 tvc_tag;
81
82 u32 tvc_sgl_count;
83 u32 tvc_prot_sgl_count;
84
85 u32 tvc_lun;
86
87 struct scatterlist *tvc_sgl;
88 struct scatterlist *tvc_prot_sgl;
89 struct page **tvc_upages;
90
91 struct iovec tvc_resp_iov;
92
93 struct vhost_scsi *tvc_vhost;
94
95 struct vhost_virtqueue *tvc_vq;
96
97 struct vhost_scsi_nexus *tvc_nexus;
98
99 struct se_cmd tvc_se_cmd;
100
101 struct work_struct work;
102
103 unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE];
104
105 unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
106
107 struct llist_node tvc_completion_list;
108
109 struct vhost_scsi_inflight *inflight;
110};
111
112struct vhost_scsi_nexus {
113
114 struct se_session *tvn_se_sess;
115};
116
117struct vhost_scsi_tpg {
118
119 u16 tport_tpgt;
120
121 int tv_tpg_port_count;
122
123 int tv_tpg_vhost_count;
124
125 int tv_fabric_prot_type;
126
127 struct list_head tv_tpg_list;
128
129 struct mutex tv_tpg_mutex;
130
131 struct vhost_scsi_nexus *tpg_nexus;
132
133 struct vhost_scsi_tport *tport;
134
135 struct se_portal_group se_tpg;
136
137 struct vhost_scsi *vhost_scsi;
138};
139
140struct vhost_scsi_tport {
141
142 u8 tport_proto_id;
143
144 u64 tport_wwpn;
145
146 char tport_name[VHOST_SCSI_NAMELEN];
147
148 struct se_wwn tport_wwn;
149};
150
151struct vhost_scsi_evt {
152
153 struct virtio_scsi_event event;
154
155 struct llist_node list;
156};
157
158enum {
159 VHOST_SCSI_VQ_CTL = 0,
160 VHOST_SCSI_VQ_EVT = 1,
161 VHOST_SCSI_VQ_IO = 2,
162};
163
164
165enum {
166 VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
167 (1ULL << VIRTIO_SCSI_F_T10_PI)
168};
169
170#define VHOST_SCSI_MAX_TARGET 256
171#define VHOST_SCSI_MAX_VQ 128
172#define VHOST_SCSI_MAX_EVENT 128
173
174struct vhost_scsi_virtqueue {
175 struct vhost_virtqueue vq;
176
177
178
179
180
181 struct vhost_scsi_inflight inflights[2];
182
183
184
185
186 int inflight_idx;
187};
188
189struct vhost_scsi {
190
191 struct vhost_scsi_tpg **vs_tpg;
192 char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
193
194 struct vhost_dev dev;
195 struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ];
196
197 struct vhost_work vs_completion_work;
198 struct llist_head vs_completion_list;
199
200 struct vhost_work vs_event_work;
201 struct llist_head vs_event_list;
202
203 bool vs_events_missed;
204 int vs_events_nr;
205};
206
207static struct workqueue_struct *vhost_scsi_workqueue;
208
209
210static DEFINE_MUTEX(vhost_scsi_mutex);
211static LIST_HEAD(vhost_scsi_list);
212
213static int iov_num_pages(void __user *iov_base, size_t iov_len)
214{
215 return (PAGE_ALIGN((unsigned long)iov_base + iov_len) -
216 ((unsigned long)iov_base & PAGE_MASK)) >> PAGE_SHIFT;
217}
218
219static void vhost_scsi_done_inflight(struct kref *kref)
220{
221 struct vhost_scsi_inflight *inflight;
222
223 inflight = container_of(kref, struct vhost_scsi_inflight, kref);
224 complete(&inflight->comp);
225}
226
227static void vhost_scsi_init_inflight(struct vhost_scsi *vs,
228 struct vhost_scsi_inflight *old_inflight[])
229{
230 struct vhost_scsi_inflight *new_inflight;
231 struct vhost_virtqueue *vq;
232 int idx, i;
233
234 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
235 vq = &vs->vqs[i].vq;
236
237 mutex_lock(&vq->mutex);
238
239
240 idx = vs->vqs[i].inflight_idx;
241 if (old_inflight)
242 old_inflight[i] = &vs->vqs[i].inflights[idx];
243
244
245 vs->vqs[i].inflight_idx = idx ^ 1;
246 new_inflight = &vs->vqs[i].inflights[idx ^ 1];
247 kref_init(&new_inflight->kref);
248 init_completion(&new_inflight->comp);
249
250 mutex_unlock(&vq->mutex);
251 }
252}
253
254static struct vhost_scsi_inflight *
255vhost_scsi_get_inflight(struct vhost_virtqueue *vq)
256{
257 struct vhost_scsi_inflight *inflight;
258 struct vhost_scsi_virtqueue *svq;
259
260 svq = container_of(vq, struct vhost_scsi_virtqueue, vq);
261 inflight = &svq->inflights[svq->inflight_idx];
262 kref_get(&inflight->kref);
263
264 return inflight;
265}
266
267static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight)
268{
269 kref_put(&inflight->kref, vhost_scsi_done_inflight);
270}
271
272static int vhost_scsi_check_true(struct se_portal_group *se_tpg)
273{
274 return 1;
275}
276
277static int vhost_scsi_check_false(struct se_portal_group *se_tpg)
278{
279 return 0;
280}
281
282static char *vhost_scsi_get_fabric_name(void)
283{
284 return "vhost";
285}
286
287static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg)
288{
289 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
290 struct vhost_scsi_tpg, se_tpg);
291 struct vhost_scsi_tport *tport = tpg->tport;
292
293 return &tport->tport_name[0];
294}
295
296static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg)
297{
298 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
299 struct vhost_scsi_tpg, se_tpg);
300 return tpg->tport_tpgt;
301}
302
303static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg)
304{
305 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
306 struct vhost_scsi_tpg, se_tpg);
307
308 return tpg->tv_fabric_prot_type;
309}
310
311static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg)
312{
313 return 1;
314}
315
316static void vhost_scsi_release_cmd(struct se_cmd *se_cmd)
317{
318 struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd,
319 struct vhost_scsi_cmd, tvc_se_cmd);
320 struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess;
321 int i;
322
323 if (tv_cmd->tvc_sgl_count) {
324 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
325 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
326 }
327 if (tv_cmd->tvc_prot_sgl_count) {
328 for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++)
329 put_page(sg_page(&tv_cmd->tvc_prot_sgl[i]));
330 }
331
332 vhost_scsi_put_inflight(tv_cmd->inflight);
333 percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag);
334}
335
336static u32 vhost_scsi_sess_get_index(struct se_session *se_sess)
337{
338 return 0;
339}
340
341static int vhost_scsi_write_pending(struct se_cmd *se_cmd)
342{
343
344 target_execute_cmd(se_cmd);
345 return 0;
346}
347
348static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd)
349{
350 return 0;
351}
352
353static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl)
354{
355 return;
356}
357
358static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd)
359{
360 return 0;
361}
362
363static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd)
364{
365 struct vhost_scsi *vs = cmd->tvc_vhost;
366
367 llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);
368
369 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
370}
371
372static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd)
373{
374 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
375 struct vhost_scsi_cmd, tvc_se_cmd);
376 vhost_scsi_complete_cmd(cmd);
377 return 0;
378}
379
380static int vhost_scsi_queue_status(struct se_cmd *se_cmd)
381{
382 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
383 struct vhost_scsi_cmd, tvc_se_cmd);
384 vhost_scsi_complete_cmd(cmd);
385 return 0;
386}
387
388static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd)
389{
390 return;
391}
392
393static void vhost_scsi_aborted_task(struct se_cmd *se_cmd)
394{
395 return;
396}
397
398static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
399{
400 vs->vs_events_nr--;
401 kfree(evt);
402}
403
404static struct vhost_scsi_evt *
405vhost_scsi_allocate_evt(struct vhost_scsi *vs,
406 u32 event, u32 reason)
407{
408 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
409 struct vhost_scsi_evt *evt;
410
411 if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
412 vs->vs_events_missed = true;
413 return NULL;
414 }
415
416 evt = kzalloc(sizeof(*evt), GFP_KERNEL);
417 if (!evt) {
418 vq_err(vq, "Failed to allocate vhost_scsi_evt\n");
419 vs->vs_events_missed = true;
420 return NULL;
421 }
422
423 evt->event.event = cpu_to_vhost32(vq, event);
424 evt->event.reason = cpu_to_vhost32(vq, reason);
425 vs->vs_events_nr++;
426
427 return evt;
428}
429
430static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd)
431{
432 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
433
434
435 transport_generic_free_cmd(se_cmd, 0);
436
437}
438
439static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
440{
441 return target_put_sess_cmd(se_cmd);
442}
443
444static void
445vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
446{
447 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
448 struct virtio_scsi_event *event = &evt->event;
449 struct virtio_scsi_event __user *eventp;
450 unsigned out, in;
451 int head, ret;
452
453 if (!vq->private_data) {
454 vs->vs_events_missed = true;
455 return;
456 }
457
458again:
459 vhost_disable_notify(&vs->dev, vq);
460 head = vhost_get_vq_desc(vq, vq->iov,
461 ARRAY_SIZE(vq->iov), &out, &in,
462 NULL, NULL);
463 if (head < 0) {
464 vs->vs_events_missed = true;
465 return;
466 }
467 if (head == vq->num) {
468 if (vhost_enable_notify(&vs->dev, vq))
469 goto again;
470 vs->vs_events_missed = true;
471 return;
472 }
473
474 if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
475 vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
476 vq->iov[out].iov_len);
477 vs->vs_events_missed = true;
478 return;
479 }
480
481 if (vs->vs_events_missed) {
482 event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED);
483 vs->vs_events_missed = false;
484 }
485
486 eventp = vq->iov[out].iov_base;
487 ret = __copy_to_user(eventp, event, sizeof(*event));
488 if (!ret)
489 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
490 else
491 vq_err(vq, "Faulted on vhost_scsi_send_event\n");
492}
493
494static void vhost_scsi_evt_work(struct vhost_work *work)
495{
496 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
497 vs_event_work);
498 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
499 struct vhost_scsi_evt *evt, *t;
500 struct llist_node *llnode;
501
502 mutex_lock(&vq->mutex);
503 llnode = llist_del_all(&vs->vs_event_list);
504 llist_for_each_entry_safe(evt, t, llnode, list) {
505 vhost_scsi_do_evt_work(vs, evt);
506 vhost_scsi_free_evt(vs, evt);
507 }
508 mutex_unlock(&vq->mutex);
509}
510
511
512
513
514
515
516static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
517{
518 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
519 vs_completion_work);
520 DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
521 struct virtio_scsi_cmd_resp v_rsp;
522 struct vhost_scsi_cmd *cmd;
523 struct llist_node *llnode;
524 struct se_cmd *se_cmd;
525 struct iov_iter iov_iter;
526 int ret, vq;
527
528 bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
529 llnode = llist_del_all(&vs->vs_completion_list);
530 llist_for_each_entry(cmd, llnode, tvc_completion_list) {
531 se_cmd = &cmd->tvc_se_cmd;
532
533 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
534 cmd, se_cmd->residual_count, se_cmd->scsi_status);
535
536 memset(&v_rsp, 0, sizeof(v_rsp));
537 v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count);
538
539 v_rsp.status = se_cmd->scsi_status;
540 v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq,
541 se_cmd->scsi_sense_length);
542 memcpy(v_rsp.sense, cmd->tvc_sense_buf,
543 se_cmd->scsi_sense_length);
544
545 iov_iter_init(&iov_iter, READ, &cmd->tvc_resp_iov,
546 cmd->tvc_in_iovs, sizeof(v_rsp));
547 ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter);
548 if (likely(ret == sizeof(v_rsp))) {
549 struct vhost_scsi_virtqueue *q;
550 vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
551 q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
552 vq = q - vs->vqs;
553 __set_bit(vq, signal);
554 } else
555 pr_err("Faulted on virtio_scsi_cmd_resp\n");
556
557 vhost_scsi_free_cmd(cmd);
558 }
559
560 vq = -1;
561 while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
562 < VHOST_SCSI_MAX_VQ)
563 vhost_signal(&vs->dev, &vs->vqs[vq].vq);
564}
565
566static struct vhost_scsi_cmd *
567vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg,
568 unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
569 u32 exp_data_len, int data_direction)
570{
571 struct vhost_scsi_cmd *cmd;
572 struct vhost_scsi_nexus *tv_nexus;
573 struct se_session *se_sess;
574 struct scatterlist *sg, *prot_sg;
575 struct page **pages;
576 int tag;
577
578 tv_nexus = tpg->tpg_nexus;
579 if (!tv_nexus) {
580 pr_err("Unable to locate active struct vhost_scsi_nexus\n");
581 return ERR_PTR(-EIO);
582 }
583 se_sess = tv_nexus->tvn_se_sess;
584
585 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING);
586 if (tag < 0) {
587 pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
588 return ERR_PTR(-ENOMEM);
589 }
590
591 cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag];
592 sg = cmd->tvc_sgl;
593 prot_sg = cmd->tvc_prot_sgl;
594 pages = cmd->tvc_upages;
595 memset(cmd, 0, sizeof(struct vhost_scsi_cmd));
596
597 cmd->tvc_sgl = sg;
598 cmd->tvc_prot_sgl = prot_sg;
599 cmd->tvc_upages = pages;
600 cmd->tvc_se_cmd.map_tag = tag;
601 cmd->tvc_tag = scsi_tag;
602 cmd->tvc_lun = lun;
603 cmd->tvc_task_attr = task_attr;
604 cmd->tvc_exp_data_len = exp_data_len;
605 cmd->tvc_data_direction = data_direction;
606 cmd->tvc_nexus = tv_nexus;
607 cmd->inflight = vhost_scsi_get_inflight(vq);
608
609 memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE);
610
611 return cmd;
612}
613
614
615
616
617
618
619static int
620vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd,
621 void __user *ptr,
622 size_t len,
623 struct scatterlist *sgl,
624 bool write)
625{
626 unsigned int npages = 0, offset, nbytes;
627 unsigned int pages_nr = iov_num_pages(ptr, len);
628 struct scatterlist *sg = sgl;
629 struct page **pages = cmd->tvc_upages;
630 int ret, i;
631
632 if (pages_nr > VHOST_SCSI_PREALLOC_UPAGES) {
633 pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
634 " preallocated VHOST_SCSI_PREALLOC_UPAGES: %u\n",
635 pages_nr, VHOST_SCSI_PREALLOC_UPAGES);
636 return -ENOBUFS;
637 }
638
639 ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
640
641 if (ret < 0)
642 goto out;
643
644 if (ret != pages_nr) {
645 for (i = 0; i < ret; i++)
646 put_page(pages[i]);
647 ret = -EFAULT;
648 goto out;
649 }
650
651 while (len > 0) {
652 offset = (uintptr_t)ptr & ~PAGE_MASK;
653 nbytes = min_t(unsigned int, PAGE_SIZE - offset, len);
654 sg_set_page(sg, pages[npages], nbytes, offset);
655 ptr += nbytes;
656 len -= nbytes;
657 sg++;
658 npages++;
659 }
660
661out:
662 return ret;
663}
664
665static int
666vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls)
667{
668 int sgl_count = 0;
669
670 if (!iter || !iter->iov) {
671 pr_err("%s: iter->iov is NULL, but expected bytes: %zu"
672 " present\n", __func__, bytes);
673 return -EINVAL;
674 }
675
676 sgl_count = iov_iter_npages(iter, 0xffff);
677 if (sgl_count > max_sgls) {
678 pr_err("%s: requested sgl_count: %d exceeds pre-allocated"
679 " max_sgls: %d\n", __func__, sgl_count, max_sgls);
680 return -EINVAL;
681 }
682 return sgl_count;
683}
684
685static int
686vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write,
687 struct iov_iter *iter,
688 struct scatterlist *sg, int sg_count)
689{
690 size_t off = iter->iov_offset;
691 int i, ret;
692
693 for (i = 0; i < iter->nr_segs; i++) {
694 void __user *base = iter->iov[i].iov_base + off;
695 size_t len = iter->iov[i].iov_len - off;
696
697 ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write);
698 if (ret < 0) {
699 for (i = 0; i < sg_count; i++) {
700 struct page *page = sg_page(&sg[i]);
701 if (page)
702 put_page(page);
703 }
704 return ret;
705 }
706 sg += ret;
707 off = 0;
708 }
709 return 0;
710}
711
712static int
713vhost_scsi_mapal(struct vhost_scsi_cmd *cmd,
714 size_t prot_bytes, struct iov_iter *prot_iter,
715 size_t data_bytes, struct iov_iter *data_iter)
716{
717 int sgl_count, ret;
718 bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE);
719
720 if (prot_bytes) {
721 sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes,
722 VHOST_SCSI_PREALLOC_PROT_SGLS);
723 if (sgl_count < 0)
724 return sgl_count;
725
726 sg_init_table(cmd->tvc_prot_sgl, sgl_count);
727 cmd->tvc_prot_sgl_count = sgl_count;
728 pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
729 cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count);
730
731 ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter,
732 cmd->tvc_prot_sgl,
733 cmd->tvc_prot_sgl_count);
734 if (ret < 0) {
735 cmd->tvc_prot_sgl_count = 0;
736 return ret;
737 }
738 }
739 sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes,
740 VHOST_SCSI_PREALLOC_SGLS);
741 if (sgl_count < 0)
742 return sgl_count;
743
744 sg_init_table(cmd->tvc_sgl, sgl_count);
745 cmd->tvc_sgl_count = sgl_count;
746 pr_debug("%s data_sg %p data_sgl_count %u\n", __func__,
747 cmd->tvc_sgl, cmd->tvc_sgl_count);
748
749 ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter,
750 cmd->tvc_sgl, cmd->tvc_sgl_count);
751 if (ret < 0) {
752 cmd->tvc_sgl_count = 0;
753 return ret;
754 }
755 return 0;
756}
757
758static int vhost_scsi_to_tcm_attr(int attr)
759{
760 switch (attr) {
761 case VIRTIO_SCSI_S_SIMPLE:
762 return TCM_SIMPLE_TAG;
763 case VIRTIO_SCSI_S_ORDERED:
764 return TCM_ORDERED_TAG;
765 case VIRTIO_SCSI_S_HEAD:
766 return TCM_HEAD_TAG;
767 case VIRTIO_SCSI_S_ACA:
768 return TCM_ACA_TAG;
769 default:
770 break;
771 }
772 return TCM_SIMPLE_TAG;
773}
774
775static void vhost_scsi_submission_work(struct work_struct *work)
776{
777 struct vhost_scsi_cmd *cmd =
778 container_of(work, struct vhost_scsi_cmd, work);
779 struct vhost_scsi_nexus *tv_nexus;
780 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
781 struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
782 int rc;
783
784
785 if (cmd->tvc_sgl_count) {
786 sg_ptr = cmd->tvc_sgl;
787
788 if (cmd->tvc_prot_sgl_count)
789 sg_prot_ptr = cmd->tvc_prot_sgl;
790 else
791 se_cmd->prot_pto = true;
792 } else {
793 sg_ptr = NULL;
794 }
795 tv_nexus = cmd->tvc_nexus;
796
797 se_cmd->tag = 0;
798 rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
799 cmd->tvc_cdb, &cmd->tvc_sense_buf[0],
800 cmd->tvc_lun, cmd->tvc_exp_data_len,
801 vhost_scsi_to_tcm_attr(cmd->tvc_task_attr),
802 cmd->tvc_data_direction, TARGET_SCF_ACK_KREF,
803 sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr,
804 cmd->tvc_prot_sgl_count);
805 if (rc < 0) {
806 transport_send_check_condition_and_sense(se_cmd,
807 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
808 transport_generic_free_cmd(se_cmd, 0);
809 }
810}
811
812static void
813vhost_scsi_send_bad_target(struct vhost_scsi *vs,
814 struct vhost_virtqueue *vq,
815 int head, unsigned out)
816{
817 struct virtio_scsi_cmd_resp __user *resp;
818 struct virtio_scsi_cmd_resp rsp;
819 int ret;
820
821 memset(&rsp, 0, sizeof(rsp));
822 rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
823 resp = vq->iov[out].iov_base;
824 ret = __copy_to_user(resp, &rsp, sizeof(rsp));
825 if (!ret)
826 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
827 else
828 pr_err("Faulted on virtio_scsi_cmd_resp\n");
829}
830
831static void
832vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
833{
834 struct vhost_scsi_tpg **vs_tpg, *tpg;
835 struct virtio_scsi_cmd_req v_req;
836 struct virtio_scsi_cmd_req_pi v_req_pi;
837 struct vhost_scsi_cmd *cmd;
838 struct iov_iter out_iter, in_iter, prot_iter, data_iter;
839 u64 tag;
840 u32 exp_data_len, data_direction;
841 unsigned int out = 0, in = 0;
842 int head, ret, prot_bytes;
843 size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp);
844 size_t out_size, in_size;
845 u16 lun;
846 u8 *target, *lunp, task_attr;
847 bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI);
848 void *req, *cdb;
849
850 mutex_lock(&vq->mutex);
851
852
853
854
855 vs_tpg = vq->private_data;
856 if (!vs_tpg)
857 goto out;
858
859 vhost_disable_notify(&vs->dev, vq);
860
861 for (;;) {
862 head = vhost_get_vq_desc(vq, vq->iov,
863 ARRAY_SIZE(vq->iov), &out, &in,
864 NULL, NULL);
865 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
866 head, out, in);
867
868 if (unlikely(head < 0))
869 break;
870
871 if (head == vq->num) {
872 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
873 vhost_disable_notify(&vs->dev, vq);
874 continue;
875 }
876 break;
877 }
878
879
880
881
882 if (unlikely(vq->iov[out].iov_len < rsp_size)) {
883 vq_err(vq, "Expecting at least virtio_scsi_cmd_resp"
884 " size, got %zu bytes\n", vq->iov[out].iov_len);
885 break;
886 }
887
888
889
890
891 if (t10_pi) {
892 req = &v_req_pi;
893 req_size = sizeof(v_req_pi);
894 lunp = &v_req_pi.lun[0];
895 target = &v_req_pi.lun[1];
896 } else {
897 req = &v_req;
898 req_size = sizeof(v_req);
899 lunp = &v_req.lun[0];
900 target = &v_req.lun[1];
901 }
902
903
904
905 out_size = iov_length(vq->iov, out);
906 in_size = iov_length(&vq->iov[out], in);
907
908
909
910
911
912
913
914
915
916
917
918 iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size);
919
920 if (unlikely(!copy_from_iter_full(req, req_size, &out_iter))) {
921 vq_err(vq, "Faulted on copy_from_iter\n");
922 vhost_scsi_send_bad_target(vs, vq, head, out);
923 continue;
924 }
925
926 if (unlikely(*lunp != 1)) {
927 vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp);
928 vhost_scsi_send_bad_target(vs, vq, head, out);
929 continue;
930 }
931
932 tpg = ACCESS_ONCE(vs_tpg[*target]);
933 if (unlikely(!tpg)) {
934
935 vhost_scsi_send_bad_target(vs, vq, head, out);
936 continue;
937 }
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953 prot_bytes = 0;
954
955 if (out_size > req_size) {
956 data_direction = DMA_TO_DEVICE;
957 exp_data_len = out_size - req_size;
958 data_iter = out_iter;
959 } else if (in_size > rsp_size) {
960 data_direction = DMA_FROM_DEVICE;
961 exp_data_len = in_size - rsp_size;
962
963 iov_iter_init(&in_iter, READ, &vq->iov[out], in,
964 rsp_size + exp_data_len);
965 iov_iter_advance(&in_iter, rsp_size);
966 data_iter = in_iter;
967 } else {
968 data_direction = DMA_NONE;
969 exp_data_len = 0;
970 }
971
972
973
974
975
976 if (t10_pi) {
977 if (v_req_pi.pi_bytesout) {
978 if (data_direction != DMA_TO_DEVICE) {
979 vq_err(vq, "Received non zero pi_bytesout,"
980 " but wrong data_direction\n");
981 vhost_scsi_send_bad_target(vs, vq, head, out);
982 continue;
983 }
984 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout);
985 } else if (v_req_pi.pi_bytesin) {
986 if (data_direction != DMA_FROM_DEVICE) {
987 vq_err(vq, "Received non zero pi_bytesin,"
988 " but wrong data_direction\n");
989 vhost_scsi_send_bad_target(vs, vq, head, out);
990 continue;
991 }
992 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin);
993 }
994
995
996
997
998
999
1000
1001 if (prot_bytes) {
1002 exp_data_len -= prot_bytes;
1003 prot_iter = data_iter;
1004 iov_iter_advance(&data_iter, prot_bytes);
1005 }
1006 tag = vhost64_to_cpu(vq, v_req_pi.tag);
1007 task_attr = v_req_pi.task_attr;
1008 cdb = &v_req_pi.cdb[0];
1009 lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
1010 } else {
1011 tag = vhost64_to_cpu(vq, v_req.tag);
1012 task_attr = v_req.task_attr;
1013 cdb = &v_req.cdb[0];
1014 lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
1015 }
1016
1017
1018
1019
1020
1021
1022
1023 if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) {
1024 vq_err(vq, "Received SCSI CDB with command_size: %d that"
1025 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1026 scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE);
1027 vhost_scsi_send_bad_target(vs, vq, head, out);
1028 continue;
1029 }
1030 cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr,
1031 exp_data_len + prot_bytes,
1032 data_direction);
1033 if (IS_ERR(cmd)) {
1034 vq_err(vq, "vhost_scsi_get_tag failed %ld\n",
1035 PTR_ERR(cmd));
1036 vhost_scsi_send_bad_target(vs, vq, head, out);
1037 continue;
1038 }
1039 cmd->tvc_vhost = vs;
1040 cmd->tvc_vq = vq;
1041 cmd->tvc_resp_iov = vq->iov[out];
1042 cmd->tvc_in_iovs = in;
1043
1044 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
1045 cmd->tvc_cdb[0], cmd->tvc_lun);
1046 pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:"
1047 " %d\n", cmd, exp_data_len, prot_bytes, data_direction);
1048
1049 if (data_direction != DMA_NONE) {
1050 ret = vhost_scsi_mapal(cmd,
1051 prot_bytes, &prot_iter,
1052 exp_data_len, &data_iter);
1053 if (unlikely(ret)) {
1054 vq_err(vq, "Failed to map iov to sgl\n");
1055 vhost_scsi_release_cmd(&cmd->tvc_se_cmd);
1056 vhost_scsi_send_bad_target(vs, vq, head, out);
1057 continue;
1058 }
1059 }
1060
1061
1062
1063
1064
1065 cmd->tvc_vq_desc = head;
1066
1067
1068
1069
1070
1071
1072 INIT_WORK(&cmd->work, vhost_scsi_submission_work);
1073 queue_work(vhost_scsi_workqueue, &cmd->work);
1074 }
1075out:
1076 mutex_unlock(&vq->mutex);
1077}
1078
1079static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
1080{
1081 pr_debug("%s: The handling func for control queue.\n", __func__);
1082}
1083
1084static void
1085vhost_scsi_send_evt(struct vhost_scsi *vs,
1086 struct vhost_scsi_tpg *tpg,
1087 struct se_lun *lun,
1088 u32 event,
1089 u32 reason)
1090{
1091 struct vhost_scsi_evt *evt;
1092
1093 evt = vhost_scsi_allocate_evt(vs, event, reason);
1094 if (!evt)
1095 return;
1096
1097 if (tpg && lun) {
1098
1099
1100
1101
1102
1103 evt->event.lun[0] = 0x01;
1104 evt->event.lun[1] = tpg->tport_tpgt;
1105 if (lun->unpacked_lun >= 256)
1106 evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
1107 evt->event.lun[3] = lun->unpacked_lun & 0xFF;
1108 }
1109
1110 llist_add(&evt->list, &vs->vs_event_list);
1111 vhost_work_queue(&vs->dev, &vs->vs_event_work);
1112}
1113
1114static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
1115{
1116 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1117 poll.work);
1118 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1119
1120 mutex_lock(&vq->mutex);
1121 if (!vq->private_data)
1122 goto out;
1123
1124 if (vs->vs_events_missed)
1125 vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
1126out:
1127 mutex_unlock(&vq->mutex);
1128}
1129
1130static void vhost_scsi_handle_kick(struct vhost_work *work)
1131{
1132 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1133 poll.work);
1134 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1135
1136 vhost_scsi_handle_vq(vs, vq);
1137}
1138
1139static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
1140{
1141 vhost_poll_flush(&vs->vqs[index].vq.poll);
1142}
1143
1144
1145static void vhost_scsi_flush(struct vhost_scsi *vs)
1146{
1147 struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];
1148 int i;
1149
1150
1151 vhost_scsi_init_inflight(vs, old_inflight);
1152
1153
1154
1155
1156
1157
1158 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1159 kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight);
1160
1161
1162 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1163 vhost_scsi_flush_vq(vs, i);
1164 vhost_work_flush(&vs->dev, &vs->vs_completion_work);
1165 vhost_work_flush(&vs->dev, &vs->vs_event_work);
1166
1167
1168 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1169 wait_for_completion(&old_inflight[i]->comp);
1170}
1171
1172
1173
1174
1175
1176
1177
1178
1179static int
1180vhost_scsi_set_endpoint(struct vhost_scsi *vs,
1181 struct vhost_scsi_target *t)
1182{
1183 struct se_portal_group *se_tpg;
1184 struct vhost_scsi_tport *tv_tport;
1185 struct vhost_scsi_tpg *tpg;
1186 struct vhost_scsi_tpg **vs_tpg;
1187 struct vhost_virtqueue *vq;
1188 int index, ret, i, len;
1189 bool match = false;
1190
1191 mutex_lock(&vhost_scsi_mutex);
1192 mutex_lock(&vs->dev.mutex);
1193
1194
1195 for (index = 0; index < vs->dev.nvqs; ++index) {
1196
1197 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1198 ret = -EFAULT;
1199 goto out;
1200 }
1201 }
1202
1203 len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
1204 vs_tpg = kzalloc(len, GFP_KERNEL);
1205 if (!vs_tpg) {
1206 ret = -ENOMEM;
1207 goto out;
1208 }
1209 if (vs->vs_tpg)
1210 memcpy(vs_tpg, vs->vs_tpg, len);
1211
1212 list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) {
1213 mutex_lock(&tpg->tv_tpg_mutex);
1214 if (!tpg->tpg_nexus) {
1215 mutex_unlock(&tpg->tv_tpg_mutex);
1216 continue;
1217 }
1218 if (tpg->tv_tpg_vhost_count != 0) {
1219 mutex_unlock(&tpg->tv_tpg_mutex);
1220 continue;
1221 }
1222 tv_tport = tpg->tport;
1223
1224 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1225 if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
1226 kfree(vs_tpg);
1227 mutex_unlock(&tpg->tv_tpg_mutex);
1228 ret = -EEXIST;
1229 goto out;
1230 }
1231
1232
1233
1234
1235
1236
1237 se_tpg = &tpg->se_tpg;
1238 ret = target_depend_item(&se_tpg->tpg_group.cg_item);
1239 if (ret) {
1240 pr_warn("configfs_depend_item() failed: %d\n", ret);
1241 kfree(vs_tpg);
1242 mutex_unlock(&tpg->tv_tpg_mutex);
1243 goto out;
1244 }
1245 tpg->tv_tpg_vhost_count++;
1246 tpg->vhost_scsi = vs;
1247 vs_tpg[tpg->tport_tpgt] = tpg;
1248 smp_mb__after_atomic();
1249 match = true;
1250 }
1251 mutex_unlock(&tpg->tv_tpg_mutex);
1252 }
1253
1254 if (match) {
1255 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1256 sizeof(vs->vs_vhost_wwpn));
1257 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1258 vq = &vs->vqs[i].vq;
1259 mutex_lock(&vq->mutex);
1260 vq->private_data = vs_tpg;
1261 vhost_vq_init_access(vq);
1262 mutex_unlock(&vq->mutex);
1263 }
1264 ret = 0;
1265 } else {
1266 ret = -EEXIST;
1267 }
1268
1269
1270
1271
1272
1273 vhost_scsi_flush(vs);
1274 kfree(vs->vs_tpg);
1275 vs->vs_tpg = vs_tpg;
1276
1277out:
1278 mutex_unlock(&vs->dev.mutex);
1279 mutex_unlock(&vhost_scsi_mutex);
1280 return ret;
1281}
1282
1283static int
1284vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
1285 struct vhost_scsi_target *t)
1286{
1287 struct se_portal_group *se_tpg;
1288 struct vhost_scsi_tport *tv_tport;
1289 struct vhost_scsi_tpg *tpg;
1290 struct vhost_virtqueue *vq;
1291 bool match = false;
1292 int index, ret, i;
1293 u8 target;
1294
1295 mutex_lock(&vhost_scsi_mutex);
1296 mutex_lock(&vs->dev.mutex);
1297
1298 for (index = 0; index < vs->dev.nvqs; ++index) {
1299 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1300 ret = -EFAULT;
1301 goto err_dev;
1302 }
1303 }
1304
1305 if (!vs->vs_tpg) {
1306 ret = 0;
1307 goto err_dev;
1308 }
1309
1310 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1311 target = i;
1312 tpg = vs->vs_tpg[target];
1313 if (!tpg)
1314 continue;
1315
1316 mutex_lock(&tpg->tv_tpg_mutex);
1317 tv_tport = tpg->tport;
1318 if (!tv_tport) {
1319 ret = -ENODEV;
1320 goto err_tpg;
1321 }
1322
1323 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1324 pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
1325 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
1326 tv_tport->tport_name, tpg->tport_tpgt,
1327 t->vhost_wwpn, t->vhost_tpgt);
1328 ret = -EINVAL;
1329 goto err_tpg;
1330 }
1331 tpg->tv_tpg_vhost_count--;
1332 tpg->vhost_scsi = NULL;
1333 vs->vs_tpg[target] = NULL;
1334 match = true;
1335 mutex_unlock(&tpg->tv_tpg_mutex);
1336
1337
1338
1339
1340 se_tpg = &tpg->se_tpg;
1341 target_undepend_item(&se_tpg->tpg_group.cg_item);
1342 }
1343 if (match) {
1344 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1345 vq = &vs->vqs[i].vq;
1346 mutex_lock(&vq->mutex);
1347 vq->private_data = NULL;
1348 mutex_unlock(&vq->mutex);
1349 }
1350 }
1351
1352
1353
1354
1355 vhost_scsi_flush(vs);
1356 kfree(vs->vs_tpg);
1357 vs->vs_tpg = NULL;
1358 WARN_ON(vs->vs_events_nr);
1359 mutex_unlock(&vs->dev.mutex);
1360 mutex_unlock(&vhost_scsi_mutex);
1361 return 0;
1362
1363err_tpg:
1364 mutex_unlock(&tpg->tv_tpg_mutex);
1365err_dev:
1366 mutex_unlock(&vs->dev.mutex);
1367 mutex_unlock(&vhost_scsi_mutex);
1368 return ret;
1369}
1370
1371static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1372{
1373 struct vhost_virtqueue *vq;
1374 int i;
1375
1376 if (features & ~VHOST_SCSI_FEATURES)
1377 return -EOPNOTSUPP;
1378
1379 mutex_lock(&vs->dev.mutex);
1380 if ((features & (1 << VHOST_F_LOG_ALL)) &&
1381 !vhost_log_access_ok(&vs->dev)) {
1382 mutex_unlock(&vs->dev.mutex);
1383 return -EFAULT;
1384 }
1385
1386 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1387 vq = &vs->vqs[i].vq;
1388 mutex_lock(&vq->mutex);
1389 vq->acked_features = features;
1390 mutex_unlock(&vq->mutex);
1391 }
1392 mutex_unlock(&vs->dev.mutex);
1393 return 0;
1394}
1395
1396static int vhost_scsi_open(struct inode *inode, struct file *f)
1397{
1398 struct vhost_scsi *vs;
1399 struct vhost_virtqueue **vqs;
1400 int r = -ENOMEM, i;
1401
1402 vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_RETRY_MAYFAIL);
1403 if (!vs) {
1404 vs = vzalloc(sizeof(*vs));
1405 if (!vs)
1406 goto err_vs;
1407 }
1408
1409 vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL);
1410 if (!vqs)
1411 goto err_vqs;
1412
1413 vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);
1414 vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);
1415
1416 vs->vs_events_nr = 0;
1417 vs->vs_events_missed = false;
1418
1419 vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
1420 vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1421 vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1422 vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
1423 for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
1424 vqs[i] = &vs->vqs[i].vq;
1425 vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
1426 }
1427 vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ);
1428
1429 vhost_scsi_init_inflight(vs, NULL);
1430
1431 f->private_data = vs;
1432 return 0;
1433
1434err_vqs:
1435 kvfree(vs);
1436err_vs:
1437 return r;
1438}
1439
1440static int vhost_scsi_release(struct inode *inode, struct file *f)
1441{
1442 struct vhost_scsi *vs = f->private_data;
1443 struct vhost_scsi_target t;
1444
1445 mutex_lock(&vs->dev.mutex);
1446 memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
1447 mutex_unlock(&vs->dev.mutex);
1448 vhost_scsi_clear_endpoint(vs, &t);
1449 vhost_dev_stop(&vs->dev);
1450 vhost_dev_cleanup(&vs->dev, false);
1451
1452 vhost_scsi_flush(vs);
1453 kfree(vs->dev.vqs);
1454 kvfree(vs);
1455 return 0;
1456}
1457
1458static long
1459vhost_scsi_ioctl(struct file *f,
1460 unsigned int ioctl,
1461 unsigned long arg)
1462{
1463 struct vhost_scsi *vs = f->private_data;
1464 struct vhost_scsi_target backend;
1465 void __user *argp = (void __user *)arg;
1466 u64 __user *featurep = argp;
1467 u32 __user *eventsp = argp;
1468 u32 events_missed;
1469 u64 features;
1470 int r, abi_version = VHOST_SCSI_ABI_VERSION;
1471 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1472
1473 switch (ioctl) {
1474 case VHOST_SCSI_SET_ENDPOINT:
1475 if (copy_from_user(&backend, argp, sizeof backend))
1476 return -EFAULT;
1477 if (backend.reserved != 0)
1478 return -EOPNOTSUPP;
1479
1480 return vhost_scsi_set_endpoint(vs, &backend);
1481 case VHOST_SCSI_CLEAR_ENDPOINT:
1482 if (copy_from_user(&backend, argp, sizeof backend))
1483 return -EFAULT;
1484 if (backend.reserved != 0)
1485 return -EOPNOTSUPP;
1486
1487 return vhost_scsi_clear_endpoint(vs, &backend);
1488 case VHOST_SCSI_GET_ABI_VERSION:
1489 if (copy_to_user(argp, &abi_version, sizeof abi_version))
1490 return -EFAULT;
1491 return 0;
1492 case VHOST_SCSI_SET_EVENTS_MISSED:
1493 if (get_user(events_missed, eventsp))
1494 return -EFAULT;
1495 mutex_lock(&vq->mutex);
1496 vs->vs_events_missed = events_missed;
1497 mutex_unlock(&vq->mutex);
1498 return 0;
1499 case VHOST_SCSI_GET_EVENTS_MISSED:
1500 mutex_lock(&vq->mutex);
1501 events_missed = vs->vs_events_missed;
1502 mutex_unlock(&vq->mutex);
1503 if (put_user(events_missed, eventsp))
1504 return -EFAULT;
1505 return 0;
1506 case VHOST_GET_FEATURES:
1507 features = VHOST_SCSI_FEATURES;
1508 if (copy_to_user(featurep, &features, sizeof features))
1509 return -EFAULT;
1510 return 0;
1511 case VHOST_SET_FEATURES:
1512 if (copy_from_user(&features, featurep, sizeof features))
1513 return -EFAULT;
1514 return vhost_scsi_set_features(vs, features);
1515 default:
1516 mutex_lock(&vs->dev.mutex);
1517 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
1518
1519 if (r == -ENOIOCTLCMD)
1520 r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
1521 mutex_unlock(&vs->dev.mutex);
1522 return r;
1523 }
1524}
1525
1526#ifdef CONFIG_COMPAT
1527static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
1528 unsigned long arg)
1529{
1530 return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
1531}
1532#endif
1533
1534static const struct file_operations vhost_scsi_fops = {
1535 .owner = THIS_MODULE,
1536 .release = vhost_scsi_release,
1537 .unlocked_ioctl = vhost_scsi_ioctl,
1538#ifdef CONFIG_COMPAT
1539 .compat_ioctl = vhost_scsi_compat_ioctl,
1540#endif
1541 .open = vhost_scsi_open,
1542 .llseek = noop_llseek,
1543};
1544
1545static struct miscdevice vhost_scsi_misc = {
1546 MISC_DYNAMIC_MINOR,
1547 "vhost-scsi",
1548 &vhost_scsi_fops,
1549};
1550
1551static int __init vhost_scsi_register(void)
1552{
1553 return misc_register(&vhost_scsi_misc);
1554}
1555
1556static void vhost_scsi_deregister(void)
1557{
1558 misc_deregister(&vhost_scsi_misc);
1559}
1560
1561static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport)
1562{
1563 switch (tport->tport_proto_id) {
1564 case SCSI_PROTOCOL_SAS:
1565 return "SAS";
1566 case SCSI_PROTOCOL_FCP:
1567 return "FCP";
1568 case SCSI_PROTOCOL_ISCSI:
1569 return "iSCSI";
1570 default:
1571 break;
1572 }
1573
1574 return "Unknown";
1575}
1576
1577static void
1578vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg,
1579 struct se_lun *lun, bool plug)
1580{
1581
1582 struct vhost_scsi *vs = tpg->vhost_scsi;
1583 struct vhost_virtqueue *vq;
1584 u32 reason;
1585
1586 if (!vs)
1587 return;
1588
1589 mutex_lock(&vs->dev.mutex);
1590
1591 if (plug)
1592 reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
1593 else
1594 reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
1595
1596 vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1597 mutex_lock(&vq->mutex);
1598 if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG))
1599 vhost_scsi_send_evt(vs, tpg, lun,
1600 VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
1601 mutex_unlock(&vq->mutex);
1602 mutex_unlock(&vs->dev.mutex);
1603}
1604
1605static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1606{
1607 vhost_scsi_do_plug(tpg, lun, true);
1608}
1609
1610static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1611{
1612 vhost_scsi_do_plug(tpg, lun, false);
1613}
1614
1615static int vhost_scsi_port_link(struct se_portal_group *se_tpg,
1616 struct se_lun *lun)
1617{
1618 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1619 struct vhost_scsi_tpg, se_tpg);
1620
1621 mutex_lock(&vhost_scsi_mutex);
1622
1623 mutex_lock(&tpg->tv_tpg_mutex);
1624 tpg->tv_tpg_port_count++;
1625 mutex_unlock(&tpg->tv_tpg_mutex);
1626
1627 vhost_scsi_hotplug(tpg, lun);
1628
1629 mutex_unlock(&vhost_scsi_mutex);
1630
1631 return 0;
1632}
1633
1634static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
1635 struct se_lun *lun)
1636{
1637 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1638 struct vhost_scsi_tpg, se_tpg);
1639
1640 mutex_lock(&vhost_scsi_mutex);
1641
1642 mutex_lock(&tpg->tv_tpg_mutex);
1643 tpg->tv_tpg_port_count--;
1644 mutex_unlock(&tpg->tv_tpg_mutex);
1645
1646 vhost_scsi_hotunplug(tpg, lun);
1647
1648 mutex_unlock(&vhost_scsi_mutex);
1649}
1650
1651static void vhost_scsi_free_cmd_map_res(struct se_session *se_sess)
1652{
1653 struct vhost_scsi_cmd *tv_cmd;
1654 unsigned int i;
1655
1656 if (!se_sess->sess_cmd_map)
1657 return;
1658
1659 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1660 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1661
1662 kfree(tv_cmd->tvc_sgl);
1663 kfree(tv_cmd->tvc_prot_sgl);
1664 kfree(tv_cmd->tvc_upages);
1665 }
1666}
1667
1668static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store(
1669 struct config_item *item, const char *page, size_t count)
1670{
1671 struct se_portal_group *se_tpg = attrib_to_tpg(item);
1672 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1673 struct vhost_scsi_tpg, se_tpg);
1674 unsigned long val;
1675 int ret = kstrtoul(page, 0, &val);
1676
1677 if (ret) {
1678 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
1679 return ret;
1680 }
1681 if (val != 0 && val != 1 && val != 3) {
1682 pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val);
1683 return -EINVAL;
1684 }
1685 tpg->tv_fabric_prot_type = val;
1686
1687 return count;
1688}
1689
1690static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show(
1691 struct config_item *item, char *page)
1692{
1693 struct se_portal_group *se_tpg = attrib_to_tpg(item);
1694 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1695 struct vhost_scsi_tpg, se_tpg);
1696
1697 return sprintf(page, "%d\n", tpg->tv_fabric_prot_type);
1698}
1699
1700CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type);
1701
1702static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = {
1703 &vhost_scsi_tpg_attrib_attr_fabric_prot_type,
1704 NULL,
1705};
1706
1707static int vhost_scsi_nexus_cb(struct se_portal_group *se_tpg,
1708 struct se_session *se_sess, void *p)
1709{
1710 struct vhost_scsi_cmd *tv_cmd;
1711 unsigned int i;
1712
1713 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1714 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1715
1716 tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) *
1717 VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL);
1718 if (!tv_cmd->tvc_sgl) {
1719 pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
1720 goto out;
1721 }
1722
1723 tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) *
1724 VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL);
1725 if (!tv_cmd->tvc_upages) {
1726 pr_err("Unable to allocate tv_cmd->tvc_upages\n");
1727 goto out;
1728 }
1729
1730 tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) *
1731 VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL);
1732 if (!tv_cmd->tvc_prot_sgl) {
1733 pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
1734 goto out;
1735 }
1736 }
1737 return 0;
1738out:
1739 vhost_scsi_free_cmd_map_res(se_sess);
1740 return -ENOMEM;
1741}
1742
1743static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
1744 const char *name)
1745{
1746 struct vhost_scsi_nexus *tv_nexus;
1747
1748 mutex_lock(&tpg->tv_tpg_mutex);
1749 if (tpg->tpg_nexus) {
1750 mutex_unlock(&tpg->tv_tpg_mutex);
1751 pr_debug("tpg->tpg_nexus already exists\n");
1752 return -EEXIST;
1753 }
1754
1755 tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL);
1756 if (!tv_nexus) {
1757 mutex_unlock(&tpg->tv_tpg_mutex);
1758 pr_err("Unable to allocate struct vhost_scsi_nexus\n");
1759 return -ENOMEM;
1760 }
1761
1762
1763
1764
1765
1766 tv_nexus->tvn_se_sess = target_alloc_session(&tpg->se_tpg,
1767 VHOST_SCSI_DEFAULT_TAGS,
1768 sizeof(struct vhost_scsi_cmd),
1769 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
1770 (unsigned char *)name, tv_nexus,
1771 vhost_scsi_nexus_cb);
1772 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1773 mutex_unlock(&tpg->tv_tpg_mutex);
1774 kfree(tv_nexus);
1775 return -ENOMEM;
1776 }
1777 tpg->tpg_nexus = tv_nexus;
1778
1779 mutex_unlock(&tpg->tv_tpg_mutex);
1780 return 0;
1781}
1782
1783static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
1784{
1785 struct se_session *se_sess;
1786 struct vhost_scsi_nexus *tv_nexus;
1787
1788 mutex_lock(&tpg->tv_tpg_mutex);
1789 tv_nexus = tpg->tpg_nexus;
1790 if (!tv_nexus) {
1791 mutex_unlock(&tpg->tv_tpg_mutex);
1792 return -ENODEV;
1793 }
1794
1795 se_sess = tv_nexus->tvn_se_sess;
1796 if (!se_sess) {
1797 mutex_unlock(&tpg->tv_tpg_mutex);
1798 return -ENODEV;
1799 }
1800
1801 if (tpg->tv_tpg_port_count != 0) {
1802 mutex_unlock(&tpg->tv_tpg_mutex);
1803 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1804 " active TPG port count: %d\n",
1805 tpg->tv_tpg_port_count);
1806 return -EBUSY;
1807 }
1808
1809 if (tpg->tv_tpg_vhost_count != 0) {
1810 mutex_unlock(&tpg->tv_tpg_mutex);
1811 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1812 " active TPG vhost count: %d\n",
1813 tpg->tv_tpg_vhost_count);
1814 return -EBUSY;
1815 }
1816
1817 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
1818 " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport),
1819 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1820
1821 vhost_scsi_free_cmd_map_res(se_sess);
1822
1823
1824
1825 transport_deregister_session(tv_nexus->tvn_se_sess);
1826 tpg->tpg_nexus = NULL;
1827 mutex_unlock(&tpg->tv_tpg_mutex);
1828
1829 kfree(tv_nexus);
1830 return 0;
1831}
1832
1833static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page)
1834{
1835 struct se_portal_group *se_tpg = to_tpg(item);
1836 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1837 struct vhost_scsi_tpg, se_tpg);
1838 struct vhost_scsi_nexus *tv_nexus;
1839 ssize_t ret;
1840
1841 mutex_lock(&tpg->tv_tpg_mutex);
1842 tv_nexus = tpg->tpg_nexus;
1843 if (!tv_nexus) {
1844 mutex_unlock(&tpg->tv_tpg_mutex);
1845 return -ENODEV;
1846 }
1847 ret = snprintf(page, PAGE_SIZE, "%s\n",
1848 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1849 mutex_unlock(&tpg->tv_tpg_mutex);
1850
1851 return ret;
1852}
1853
1854static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item,
1855 const char *page, size_t count)
1856{
1857 struct se_portal_group *se_tpg = to_tpg(item);
1858 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1859 struct vhost_scsi_tpg, se_tpg);
1860 struct vhost_scsi_tport *tport_wwn = tpg->tport;
1861 unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr;
1862 int ret;
1863
1864
1865
1866 if (!strncmp(page, "NULL", 4)) {
1867 ret = vhost_scsi_drop_nexus(tpg);
1868 return (!ret) ? count : ret;
1869 }
1870
1871
1872
1873
1874
1875 if (strlen(page) >= VHOST_SCSI_NAMELEN) {
1876 pr_err("Emulated NAA Sas Address: %s, exceeds"
1877 " max: %d\n", page, VHOST_SCSI_NAMELEN);
1878 return -EINVAL;
1879 }
1880 snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page);
1881
1882 ptr = strstr(i_port, "naa.");
1883 if (ptr) {
1884 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1885 pr_err("Passed SAS Initiator Port %s does not"
1886 " match target port protoid: %s\n", i_port,
1887 vhost_scsi_dump_proto_id(tport_wwn));
1888 return -EINVAL;
1889 }
1890 port_ptr = &i_port[0];
1891 goto check_newline;
1892 }
1893 ptr = strstr(i_port, "fc.");
1894 if (ptr) {
1895 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1896 pr_err("Passed FCP Initiator Port %s does not"
1897 " match target port protoid: %s\n", i_port,
1898 vhost_scsi_dump_proto_id(tport_wwn));
1899 return -EINVAL;
1900 }
1901 port_ptr = &i_port[3];
1902 goto check_newline;
1903 }
1904 ptr = strstr(i_port, "iqn.");
1905 if (ptr) {
1906 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1907 pr_err("Passed iSCSI Initiator Port %s does not"
1908 " match target port protoid: %s\n", i_port,
1909 vhost_scsi_dump_proto_id(tport_wwn));
1910 return -EINVAL;
1911 }
1912 port_ptr = &i_port[0];
1913 goto check_newline;
1914 }
1915 pr_err("Unable to locate prefix for emulated Initiator Port:"
1916 " %s\n", i_port);
1917 return -EINVAL;
1918
1919
1920
1921check_newline:
1922 if (i_port[strlen(i_port)-1] == '\n')
1923 i_port[strlen(i_port)-1] = '\0';
1924
1925 ret = vhost_scsi_make_nexus(tpg, port_ptr);
1926 if (ret < 0)
1927 return ret;
1928
1929 return count;
1930}
1931
1932CONFIGFS_ATTR(vhost_scsi_tpg_, nexus);
1933
1934static struct configfs_attribute *vhost_scsi_tpg_attrs[] = {
1935 &vhost_scsi_tpg_attr_nexus,
1936 NULL,
1937};
1938
1939static struct se_portal_group *
1940vhost_scsi_make_tpg(struct se_wwn *wwn,
1941 struct config_group *group,
1942 const char *name)
1943{
1944 struct vhost_scsi_tport *tport = container_of(wwn,
1945 struct vhost_scsi_tport, tport_wwn);
1946
1947 struct vhost_scsi_tpg *tpg;
1948 u16 tpgt;
1949 int ret;
1950
1951 if (strstr(name, "tpgt_") != name)
1952 return ERR_PTR(-EINVAL);
1953 if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET)
1954 return ERR_PTR(-EINVAL);
1955
1956 tpg = kzalloc(sizeof(struct vhost_scsi_tpg), GFP_KERNEL);
1957 if (!tpg) {
1958 pr_err("Unable to allocate struct vhost_scsi_tpg");
1959 return ERR_PTR(-ENOMEM);
1960 }
1961 mutex_init(&tpg->tv_tpg_mutex);
1962 INIT_LIST_HEAD(&tpg->tv_tpg_list);
1963 tpg->tport = tport;
1964 tpg->tport_tpgt = tpgt;
1965
1966 ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id);
1967 if (ret < 0) {
1968 kfree(tpg);
1969 return NULL;
1970 }
1971 mutex_lock(&vhost_scsi_mutex);
1972 list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list);
1973 mutex_unlock(&vhost_scsi_mutex);
1974
1975 return &tpg->se_tpg;
1976}
1977
1978static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg)
1979{
1980 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1981 struct vhost_scsi_tpg, se_tpg);
1982
1983 mutex_lock(&vhost_scsi_mutex);
1984 list_del(&tpg->tv_tpg_list);
1985 mutex_unlock(&vhost_scsi_mutex);
1986
1987
1988
1989 vhost_scsi_drop_nexus(tpg);
1990
1991
1992
1993 core_tpg_deregister(se_tpg);
1994 kfree(tpg);
1995}
1996
1997static struct se_wwn *
1998vhost_scsi_make_tport(struct target_fabric_configfs *tf,
1999 struct config_group *group,
2000 const char *name)
2001{
2002 struct vhost_scsi_tport *tport;
2003 char *ptr;
2004 u64 wwpn = 0;
2005 int off = 0;
2006
2007
2008
2009
2010 tport = kzalloc(sizeof(struct vhost_scsi_tport), GFP_KERNEL);
2011 if (!tport) {
2012 pr_err("Unable to allocate struct vhost_scsi_tport");
2013 return ERR_PTR(-ENOMEM);
2014 }
2015 tport->tport_wwpn = wwpn;
2016
2017
2018
2019
2020 ptr = strstr(name, "naa.");
2021 if (ptr) {
2022 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
2023 goto check_len;
2024 }
2025 ptr = strstr(name, "fc.");
2026 if (ptr) {
2027 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
2028 off = 3;
2029 goto check_len;
2030 }
2031 ptr = strstr(name, "iqn.");
2032 if (ptr) {
2033 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
2034 goto check_len;
2035 }
2036
2037 pr_err("Unable to locate prefix for emulated Target Port:"
2038 " %s\n", name);
2039 kfree(tport);
2040 return ERR_PTR(-EINVAL);
2041
2042check_len:
2043 if (strlen(name) >= VHOST_SCSI_NAMELEN) {
2044 pr_err("Emulated %s Address: %s, exceeds"
2045 " max: %d\n", name, vhost_scsi_dump_proto_id(tport),
2046 VHOST_SCSI_NAMELEN);
2047 kfree(tport);
2048 return ERR_PTR(-EINVAL);
2049 }
2050 snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]);
2051
2052 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
2053 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name);
2054
2055 return &tport->tport_wwn;
2056}
2057
2058static void vhost_scsi_drop_tport(struct se_wwn *wwn)
2059{
2060 struct vhost_scsi_tport *tport = container_of(wwn,
2061 struct vhost_scsi_tport, tport_wwn);
2062
2063 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
2064 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport),
2065 tport->tport_name);
2066
2067 kfree(tport);
2068}
2069
2070static ssize_t
2071vhost_scsi_wwn_version_show(struct config_item *item, char *page)
2072{
2073 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
2074 "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2075 utsname()->machine);
2076}
2077
2078CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version);
2079
2080static struct configfs_attribute *vhost_scsi_wwn_attrs[] = {
2081 &vhost_scsi_wwn_attr_version,
2082 NULL,
2083};
2084
2085static const struct target_core_fabric_ops vhost_scsi_ops = {
2086 .module = THIS_MODULE,
2087 .name = "vhost",
2088 .get_fabric_name = vhost_scsi_get_fabric_name,
2089 .tpg_get_wwn = vhost_scsi_get_fabric_wwn,
2090 .tpg_get_tag = vhost_scsi_get_tpgt,
2091 .tpg_check_demo_mode = vhost_scsi_check_true,
2092 .tpg_check_demo_mode_cache = vhost_scsi_check_true,
2093 .tpg_check_demo_mode_write_protect = vhost_scsi_check_false,
2094 .tpg_check_prod_mode_write_protect = vhost_scsi_check_false,
2095 .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only,
2096 .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index,
2097 .release_cmd = vhost_scsi_release_cmd,
2098 .check_stop_free = vhost_scsi_check_stop_free,
2099 .sess_get_index = vhost_scsi_sess_get_index,
2100 .sess_get_initiator_sid = NULL,
2101 .write_pending = vhost_scsi_write_pending,
2102 .write_pending_status = vhost_scsi_write_pending_status,
2103 .set_default_node_attributes = vhost_scsi_set_default_node_attrs,
2104 .get_cmd_state = vhost_scsi_get_cmd_state,
2105 .queue_data_in = vhost_scsi_queue_data_in,
2106 .queue_status = vhost_scsi_queue_status,
2107 .queue_tm_rsp = vhost_scsi_queue_tm_rsp,
2108 .aborted_task = vhost_scsi_aborted_task,
2109
2110
2111
2112 .fabric_make_wwn = vhost_scsi_make_tport,
2113 .fabric_drop_wwn = vhost_scsi_drop_tport,
2114 .fabric_make_tpg = vhost_scsi_make_tpg,
2115 .fabric_drop_tpg = vhost_scsi_drop_tpg,
2116 .fabric_post_link = vhost_scsi_port_link,
2117 .fabric_pre_unlink = vhost_scsi_port_unlink,
2118
2119 .tfc_wwn_attrs = vhost_scsi_wwn_attrs,
2120 .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs,
2121 .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs,
2122};
2123
2124static int __init vhost_scsi_init(void)
2125{
2126 int ret = -ENOMEM;
2127
2128 pr_debug("TCM_VHOST fabric module %s on %s/%s"
2129 " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2130 utsname()->machine);
2131
2132
2133
2134
2135
2136 vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0);
2137 if (!vhost_scsi_workqueue)
2138 goto out;
2139
2140 ret = vhost_scsi_register();
2141 if (ret < 0)
2142 goto out_destroy_workqueue;
2143
2144 ret = target_register_template(&vhost_scsi_ops);
2145 if (ret < 0)
2146 goto out_vhost_scsi_deregister;
2147
2148 return 0;
2149
2150out_vhost_scsi_deregister:
2151 vhost_scsi_deregister();
2152out_destroy_workqueue:
2153 destroy_workqueue(vhost_scsi_workqueue);
2154out:
2155 return ret;
2156};
2157
2158static void vhost_scsi_exit(void)
2159{
2160 target_unregister_template(&vhost_scsi_ops);
2161 vhost_scsi_deregister();
2162 destroy_workqueue(vhost_scsi_workqueue);
2163};
2164
2165MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2166MODULE_ALIAS("tcm_vhost");
2167MODULE_LICENSE("GPL");
2168module_init(vhost_scsi_init);
2169module_exit(vhost_scsi_exit);
2170