This source file includes following definitions.
- vhost_scsi_done_inflight
- vhost_scsi_init_inflight
- vhost_scsi_get_inflight
- vhost_scsi_put_inflight
- vhost_scsi_check_true
- vhost_scsi_check_false
- vhost_scsi_get_fabric_wwn
- vhost_scsi_get_tpgt
- vhost_scsi_check_prot_fabric_only
- vhost_scsi_tpg_get_inst_index
- vhost_scsi_release_cmd
- vhost_scsi_sess_get_index
- vhost_scsi_write_pending
- vhost_scsi_set_default_node_attrs
- vhost_scsi_get_cmd_state
- vhost_scsi_complete_cmd
- vhost_scsi_queue_data_in
- vhost_scsi_queue_status
- vhost_scsi_queue_tm_rsp
- vhost_scsi_aborted_task
- vhost_scsi_free_evt
- vhost_scsi_allocate_evt
- vhost_scsi_free_cmd
- vhost_scsi_check_stop_free
- vhost_scsi_do_evt_work
- vhost_scsi_evt_work
- vhost_scsi_complete_cmd_work
- vhost_scsi_get_tag
- vhost_scsi_map_to_sgl
- vhost_scsi_calc_sgls
- vhost_scsi_iov_to_sgl
- vhost_scsi_mapal
- vhost_scsi_to_tcm_attr
- vhost_scsi_submission_work
- vhost_scsi_send_bad_target
- vhost_scsi_get_desc
- vhost_scsi_chk_size
- vhost_scsi_get_req
- vhost_scsi_handle_vq
- vhost_scsi_send_tmf_reject
- vhost_scsi_send_an_resp
- vhost_scsi_ctl_handle_vq
- vhost_scsi_ctl_handle_kick
- vhost_scsi_send_evt
- vhost_scsi_evt_handle_kick
- vhost_scsi_handle_kick
- vhost_scsi_flush_vq
- vhost_scsi_flush
- vhost_scsi_set_endpoint
- vhost_scsi_clear_endpoint
- vhost_scsi_set_features
- vhost_scsi_open
- vhost_scsi_release
- vhost_scsi_ioctl
- vhost_scsi_compat_ioctl
- vhost_scsi_register
- vhost_scsi_deregister
- vhost_scsi_dump_proto_id
- vhost_scsi_do_plug
- vhost_scsi_hotplug
- vhost_scsi_hotunplug
- vhost_scsi_port_link
- vhost_scsi_port_unlink
- vhost_scsi_free_cmd_map_res
- vhost_scsi_tpg_attrib_fabric_prot_type_store
- vhost_scsi_tpg_attrib_fabric_prot_type_show
- vhost_scsi_nexus_cb
- vhost_scsi_make_nexus
- vhost_scsi_drop_nexus
- vhost_scsi_tpg_nexus_show
- vhost_scsi_tpg_nexus_store
- vhost_scsi_make_tpg
- vhost_scsi_drop_tpg
- vhost_scsi_make_tport
- vhost_scsi_drop_tport
- vhost_scsi_wwn_version_show
- vhost_scsi_init
- vhost_scsi_exit
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
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
50 #include "vhost.h"
51
52 #define VHOST_SCSI_VERSION "v0.1"
53 #define VHOST_SCSI_NAMELEN 256
54 #define VHOST_SCSI_MAX_CDB_SIZE 32
55 #define VHOST_SCSI_DEFAULT_TAGS 256
56 #define VHOST_SCSI_PREALLOC_SGLS 2048
57 #define VHOST_SCSI_PREALLOC_UPAGES 2048
58 #define VHOST_SCSI_PREALLOC_PROT_SGLS 2048
59
60
61
62
63
64 #define VHOST_SCSI_WEIGHT 256
65
66 struct vhost_scsi_inflight {
67
68 struct completion comp;
69
70 struct kref kref;
71 };
72
73 struct vhost_scsi_cmd {
74
75 int tvc_vq_desc;
76
77 int tvc_task_attr;
78
79 int tvc_in_iovs;
80
81 enum dma_data_direction tvc_data_direction;
82
83 u32 tvc_exp_data_len;
84
85 u64 tvc_tag;
86
87 u32 tvc_sgl_count;
88 u32 tvc_prot_sgl_count;
89
90 u32 tvc_lun;
91
92 struct scatterlist *tvc_sgl;
93 struct scatterlist *tvc_prot_sgl;
94 struct page **tvc_upages;
95
96 struct iovec tvc_resp_iov;
97
98 struct vhost_scsi *tvc_vhost;
99
100 struct vhost_virtqueue *tvc_vq;
101
102 struct vhost_scsi_nexus *tvc_nexus;
103
104 struct se_cmd tvc_se_cmd;
105
106 struct work_struct work;
107
108 unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE];
109
110 unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
111
112 struct llist_node tvc_completion_list;
113
114 struct vhost_scsi_inflight *inflight;
115 };
116
117 struct vhost_scsi_nexus {
118
119 struct se_session *tvn_se_sess;
120 };
121
122 struct vhost_scsi_tpg {
123
124 u16 tport_tpgt;
125
126 int tv_tpg_port_count;
127
128 int tv_tpg_vhost_count;
129
130 int tv_fabric_prot_type;
131
132 struct list_head tv_tpg_list;
133
134 struct mutex tv_tpg_mutex;
135
136 struct vhost_scsi_nexus *tpg_nexus;
137
138 struct vhost_scsi_tport *tport;
139
140 struct se_portal_group se_tpg;
141
142 struct vhost_scsi *vhost_scsi;
143 };
144
145 struct vhost_scsi_tport {
146
147 u8 tport_proto_id;
148
149 u64 tport_wwpn;
150
151 char tport_name[VHOST_SCSI_NAMELEN];
152
153 struct se_wwn tport_wwn;
154 };
155
156 struct vhost_scsi_evt {
157
158 struct virtio_scsi_event event;
159
160 struct llist_node list;
161 };
162
163 enum {
164 VHOST_SCSI_VQ_CTL = 0,
165 VHOST_SCSI_VQ_EVT = 1,
166 VHOST_SCSI_VQ_IO = 2,
167 };
168
169
170 enum {
171 VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
172 (1ULL << VIRTIO_SCSI_F_T10_PI)
173 };
174
175 #define VHOST_SCSI_MAX_TARGET 256
176 #define VHOST_SCSI_MAX_VQ 128
177 #define VHOST_SCSI_MAX_EVENT 128
178
179 struct vhost_scsi_virtqueue {
180 struct vhost_virtqueue vq;
181
182
183
184
185
186 struct vhost_scsi_inflight inflights[2];
187
188
189
190
191 int inflight_idx;
192 };
193
194 struct vhost_scsi {
195
196 struct vhost_scsi_tpg **vs_tpg;
197 char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
198
199 struct vhost_dev dev;
200 struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ];
201
202 struct vhost_work vs_completion_work;
203 struct llist_head vs_completion_list;
204
205 struct vhost_work vs_event_work;
206 struct llist_head vs_event_list;
207
208 bool vs_events_missed;
209 int vs_events_nr;
210 };
211
212
213
214
215 struct vhost_scsi_ctx {
216 int head;
217 unsigned int out, in;
218 size_t req_size, rsp_size;
219 size_t out_size, in_size;
220 u8 *target, *lunp;
221 void *req;
222 struct iov_iter out_iter;
223 };
224
225 static struct workqueue_struct *vhost_scsi_workqueue;
226
227
228 static DEFINE_MUTEX(vhost_scsi_mutex);
229 static LIST_HEAD(vhost_scsi_list);
230
231 static void vhost_scsi_done_inflight(struct kref *kref)
232 {
233 struct vhost_scsi_inflight *inflight;
234
235 inflight = container_of(kref, struct vhost_scsi_inflight, kref);
236 complete(&inflight->comp);
237 }
238
239 static void vhost_scsi_init_inflight(struct vhost_scsi *vs,
240 struct vhost_scsi_inflight *old_inflight[])
241 {
242 struct vhost_scsi_inflight *new_inflight;
243 struct vhost_virtqueue *vq;
244 int idx, i;
245
246 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
247 vq = &vs->vqs[i].vq;
248
249 mutex_lock(&vq->mutex);
250
251
252 idx = vs->vqs[i].inflight_idx;
253 if (old_inflight)
254 old_inflight[i] = &vs->vqs[i].inflights[idx];
255
256
257 vs->vqs[i].inflight_idx = idx ^ 1;
258 new_inflight = &vs->vqs[i].inflights[idx ^ 1];
259 kref_init(&new_inflight->kref);
260 init_completion(&new_inflight->comp);
261
262 mutex_unlock(&vq->mutex);
263 }
264 }
265
266 static struct vhost_scsi_inflight *
267 vhost_scsi_get_inflight(struct vhost_virtqueue *vq)
268 {
269 struct vhost_scsi_inflight *inflight;
270 struct vhost_scsi_virtqueue *svq;
271
272 svq = container_of(vq, struct vhost_scsi_virtqueue, vq);
273 inflight = &svq->inflights[svq->inflight_idx];
274 kref_get(&inflight->kref);
275
276 return inflight;
277 }
278
279 static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight)
280 {
281 kref_put(&inflight->kref, vhost_scsi_done_inflight);
282 }
283
284 static int vhost_scsi_check_true(struct se_portal_group *se_tpg)
285 {
286 return 1;
287 }
288
289 static int vhost_scsi_check_false(struct se_portal_group *se_tpg)
290 {
291 return 0;
292 }
293
294 static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg)
295 {
296 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
297 struct vhost_scsi_tpg, se_tpg);
298 struct vhost_scsi_tport *tport = tpg->tport;
299
300 return &tport->tport_name[0];
301 }
302
303 static u16 vhost_scsi_get_tpgt(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 return tpg->tport_tpgt;
308 }
309
310 static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg)
311 {
312 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
313 struct vhost_scsi_tpg, se_tpg);
314
315 return tpg->tv_fabric_prot_type;
316 }
317
318 static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg)
319 {
320 return 1;
321 }
322
323 static void vhost_scsi_release_cmd(struct se_cmd *se_cmd)
324 {
325 struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd,
326 struct vhost_scsi_cmd, tvc_se_cmd);
327 struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess;
328 int i;
329
330 if (tv_cmd->tvc_sgl_count) {
331 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
332 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
333 }
334 if (tv_cmd->tvc_prot_sgl_count) {
335 for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++)
336 put_page(sg_page(&tv_cmd->tvc_prot_sgl[i]));
337 }
338
339 vhost_scsi_put_inflight(tv_cmd->inflight);
340 target_free_tag(se_sess, se_cmd);
341 }
342
343 static u32 vhost_scsi_sess_get_index(struct se_session *se_sess)
344 {
345 return 0;
346 }
347
348 static int vhost_scsi_write_pending(struct se_cmd *se_cmd)
349 {
350
351 target_execute_cmd(se_cmd);
352 return 0;
353 }
354
355 static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl)
356 {
357 return;
358 }
359
360 static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd)
361 {
362 return 0;
363 }
364
365 static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd)
366 {
367 struct vhost_scsi *vs = cmd->tvc_vhost;
368
369 llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);
370
371 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
372 }
373
374 static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd)
375 {
376 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
377 struct vhost_scsi_cmd, tvc_se_cmd);
378 vhost_scsi_complete_cmd(cmd);
379 return 0;
380 }
381
382 static int vhost_scsi_queue_status(struct se_cmd *se_cmd)
383 {
384 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
385 struct vhost_scsi_cmd, tvc_se_cmd);
386 vhost_scsi_complete_cmd(cmd);
387 return 0;
388 }
389
390 static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd)
391 {
392 return;
393 }
394
395 static void vhost_scsi_aborted_task(struct se_cmd *se_cmd)
396 {
397 return;
398 }
399
400 static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
401 {
402 vs->vs_events_nr--;
403 kfree(evt);
404 }
405
406 static struct vhost_scsi_evt *
407 vhost_scsi_allocate_evt(struct vhost_scsi *vs,
408 u32 event, u32 reason)
409 {
410 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
411 struct vhost_scsi_evt *evt;
412
413 if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
414 vs->vs_events_missed = true;
415 return NULL;
416 }
417
418 evt = kzalloc(sizeof(*evt), GFP_KERNEL);
419 if (!evt) {
420 vq_err(vq, "Failed to allocate vhost_scsi_evt\n");
421 vs->vs_events_missed = true;
422 return NULL;
423 }
424
425 evt->event.event = cpu_to_vhost32(vq, event);
426 evt->event.reason = cpu_to_vhost32(vq, reason);
427 vs->vs_events_nr++;
428
429 return evt;
430 }
431
432 static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd)
433 {
434 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
435
436
437 transport_generic_free_cmd(se_cmd, 0);
438
439 }
440
441 static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
442 {
443 return target_put_sess_cmd(se_cmd);
444 }
445
446 static void
447 vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
448 {
449 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
450 struct virtio_scsi_event *event = &evt->event;
451 struct virtio_scsi_event __user *eventp;
452 unsigned out, in;
453 int head, ret;
454
455 if (!vq->private_data) {
456 vs->vs_events_missed = true;
457 return;
458 }
459
460 again:
461 vhost_disable_notify(&vs->dev, vq);
462 head = vhost_get_vq_desc(vq, vq->iov,
463 ARRAY_SIZE(vq->iov), &out, &in,
464 NULL, NULL);
465 if (head < 0) {
466 vs->vs_events_missed = true;
467 return;
468 }
469 if (head == vq->num) {
470 if (vhost_enable_notify(&vs->dev, vq))
471 goto again;
472 vs->vs_events_missed = true;
473 return;
474 }
475
476 if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
477 vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
478 vq->iov[out].iov_len);
479 vs->vs_events_missed = true;
480 return;
481 }
482
483 if (vs->vs_events_missed) {
484 event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED);
485 vs->vs_events_missed = false;
486 }
487
488 eventp = vq->iov[out].iov_base;
489 ret = __copy_to_user(eventp, event, sizeof(*event));
490 if (!ret)
491 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
492 else
493 vq_err(vq, "Faulted on vhost_scsi_send_event\n");
494 }
495
496 static void vhost_scsi_evt_work(struct vhost_work *work)
497 {
498 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
499 vs_event_work);
500 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
501 struct vhost_scsi_evt *evt, *t;
502 struct llist_node *llnode;
503
504 mutex_lock(&vq->mutex);
505 llnode = llist_del_all(&vs->vs_event_list);
506 llist_for_each_entry_safe(evt, t, llnode, list) {
507 vhost_scsi_do_evt_work(vs, evt);
508 vhost_scsi_free_evt(vs, evt);
509 }
510 mutex_unlock(&vq->mutex);
511 }
512
513
514
515
516
517
518 static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
519 {
520 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
521 vs_completion_work);
522 DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
523 struct virtio_scsi_cmd_resp v_rsp;
524 struct vhost_scsi_cmd *cmd, *t;
525 struct llist_node *llnode;
526 struct se_cmd *se_cmd;
527 struct iov_iter iov_iter;
528 int ret, vq;
529
530 bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
531 llnode = llist_del_all(&vs->vs_completion_list);
532 llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) {
533 se_cmd = &cmd->tvc_se_cmd;
534
535 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
536 cmd, se_cmd->residual_count, se_cmd->scsi_status);
537
538 memset(&v_rsp, 0, sizeof(v_rsp));
539 v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count);
540
541 v_rsp.status = se_cmd->scsi_status;
542 v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq,
543 se_cmd->scsi_sense_length);
544 memcpy(v_rsp.sense, cmd->tvc_sense_buf,
545 se_cmd->scsi_sense_length);
546
547 iov_iter_init(&iov_iter, READ, &cmd->tvc_resp_iov,
548 cmd->tvc_in_iovs, sizeof(v_rsp));
549 ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter);
550 if (likely(ret == sizeof(v_rsp))) {
551 struct vhost_scsi_virtqueue *q;
552 vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
553 q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
554 vq = q - vs->vqs;
555 __set_bit(vq, signal);
556 } else
557 pr_err("Faulted on virtio_scsi_cmd_resp\n");
558
559 vhost_scsi_free_cmd(cmd);
560 }
561
562 vq = -1;
563 while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
564 < VHOST_SCSI_MAX_VQ)
565 vhost_signal(&vs->dev, &vs->vqs[vq].vq);
566 }
567
568 static struct vhost_scsi_cmd *
569 vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg,
570 unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
571 u32 exp_data_len, int data_direction)
572 {
573 struct vhost_scsi_cmd *cmd;
574 struct vhost_scsi_nexus *tv_nexus;
575 struct se_session *se_sess;
576 struct scatterlist *sg, *prot_sg;
577 struct page **pages;
578 int tag, cpu;
579
580 tv_nexus = tpg->tpg_nexus;
581 if (!tv_nexus) {
582 pr_err("Unable to locate active struct vhost_scsi_nexus\n");
583 return ERR_PTR(-EIO);
584 }
585 se_sess = tv_nexus->tvn_se_sess;
586
587 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
588 if (tag < 0) {
589 pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
590 return ERR_PTR(-ENOMEM);
591 }
592
593 cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag];
594 sg = cmd->tvc_sgl;
595 prot_sg = cmd->tvc_prot_sgl;
596 pages = cmd->tvc_upages;
597 memset(cmd, 0, sizeof(*cmd));
598 cmd->tvc_sgl = sg;
599 cmd->tvc_prot_sgl = prot_sg;
600 cmd->tvc_upages = pages;
601 cmd->tvc_se_cmd.map_tag = tag;
602 cmd->tvc_se_cmd.map_cpu = cpu;
603 cmd->tvc_tag = scsi_tag;
604 cmd->tvc_lun = lun;
605 cmd->tvc_task_attr = task_attr;
606 cmd->tvc_exp_data_len = exp_data_len;
607 cmd->tvc_data_direction = data_direction;
608 cmd->tvc_nexus = tv_nexus;
609 cmd->inflight = vhost_scsi_get_inflight(vq);
610
611 memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE);
612
613 return cmd;
614 }
615
616
617
618
619
620
621 static int
622 vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd,
623 struct iov_iter *iter,
624 struct scatterlist *sgl,
625 bool write)
626 {
627 struct page **pages = cmd->tvc_upages;
628 struct scatterlist *sg = sgl;
629 ssize_t bytes;
630 size_t offset;
631 unsigned int npages = 0;
632
633 bytes = iov_iter_get_pages(iter, pages, LONG_MAX,
634 VHOST_SCSI_PREALLOC_UPAGES, &offset);
635
636 if (bytes <= 0)
637 return bytes < 0 ? bytes : -EFAULT;
638
639 iov_iter_advance(iter, bytes);
640
641 while (bytes) {
642 unsigned n = min_t(unsigned, PAGE_SIZE - offset, bytes);
643 sg_set_page(sg++, pages[npages++], n, offset);
644 bytes -= n;
645 offset = 0;
646 }
647 return npages;
648 }
649
650 static int
651 vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls)
652 {
653 int sgl_count = 0;
654
655 if (!iter || !iter->iov) {
656 pr_err("%s: iter->iov is NULL, but expected bytes: %zu"
657 " present\n", __func__, bytes);
658 return -EINVAL;
659 }
660
661 sgl_count = iov_iter_npages(iter, 0xffff);
662 if (sgl_count > max_sgls) {
663 pr_err("%s: requested sgl_count: %d exceeds pre-allocated"
664 " max_sgls: %d\n", __func__, sgl_count, max_sgls);
665 return -EINVAL;
666 }
667 return sgl_count;
668 }
669
670 static int
671 vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write,
672 struct iov_iter *iter,
673 struct scatterlist *sg, int sg_count)
674 {
675 struct scatterlist *p = sg;
676 int ret;
677
678 while (iov_iter_count(iter)) {
679 ret = vhost_scsi_map_to_sgl(cmd, iter, sg, write);
680 if (ret < 0) {
681 while (p < sg) {
682 struct page *page = sg_page(p++);
683 if (page)
684 put_page(page);
685 }
686 return ret;
687 }
688 sg += ret;
689 }
690 return 0;
691 }
692
693 static int
694 vhost_scsi_mapal(struct vhost_scsi_cmd *cmd,
695 size_t prot_bytes, struct iov_iter *prot_iter,
696 size_t data_bytes, struct iov_iter *data_iter)
697 {
698 int sgl_count, ret;
699 bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE);
700
701 if (prot_bytes) {
702 sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes,
703 VHOST_SCSI_PREALLOC_PROT_SGLS);
704 if (sgl_count < 0)
705 return sgl_count;
706
707 sg_init_table(cmd->tvc_prot_sgl, sgl_count);
708 cmd->tvc_prot_sgl_count = sgl_count;
709 pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
710 cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count);
711
712 ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter,
713 cmd->tvc_prot_sgl,
714 cmd->tvc_prot_sgl_count);
715 if (ret < 0) {
716 cmd->tvc_prot_sgl_count = 0;
717 return ret;
718 }
719 }
720 sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes,
721 VHOST_SCSI_PREALLOC_SGLS);
722 if (sgl_count < 0)
723 return sgl_count;
724
725 sg_init_table(cmd->tvc_sgl, sgl_count);
726 cmd->tvc_sgl_count = sgl_count;
727 pr_debug("%s data_sg %p data_sgl_count %u\n", __func__,
728 cmd->tvc_sgl, cmd->tvc_sgl_count);
729
730 ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter,
731 cmd->tvc_sgl, cmd->tvc_sgl_count);
732 if (ret < 0) {
733 cmd->tvc_sgl_count = 0;
734 return ret;
735 }
736 return 0;
737 }
738
739 static int vhost_scsi_to_tcm_attr(int attr)
740 {
741 switch (attr) {
742 case VIRTIO_SCSI_S_SIMPLE:
743 return TCM_SIMPLE_TAG;
744 case VIRTIO_SCSI_S_ORDERED:
745 return TCM_ORDERED_TAG;
746 case VIRTIO_SCSI_S_HEAD:
747 return TCM_HEAD_TAG;
748 case VIRTIO_SCSI_S_ACA:
749 return TCM_ACA_TAG;
750 default:
751 break;
752 }
753 return TCM_SIMPLE_TAG;
754 }
755
756 static void vhost_scsi_submission_work(struct work_struct *work)
757 {
758 struct vhost_scsi_cmd *cmd =
759 container_of(work, struct vhost_scsi_cmd, work);
760 struct vhost_scsi_nexus *tv_nexus;
761 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
762 struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
763 int rc;
764
765
766 if (cmd->tvc_sgl_count) {
767 sg_ptr = cmd->tvc_sgl;
768
769 if (cmd->tvc_prot_sgl_count)
770 sg_prot_ptr = cmd->tvc_prot_sgl;
771 else
772 se_cmd->prot_pto = true;
773 } else {
774 sg_ptr = NULL;
775 }
776 tv_nexus = cmd->tvc_nexus;
777
778 se_cmd->tag = 0;
779 rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
780 cmd->tvc_cdb, &cmd->tvc_sense_buf[0],
781 cmd->tvc_lun, cmd->tvc_exp_data_len,
782 vhost_scsi_to_tcm_attr(cmd->tvc_task_attr),
783 cmd->tvc_data_direction, TARGET_SCF_ACK_KREF,
784 sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr,
785 cmd->tvc_prot_sgl_count);
786 if (rc < 0) {
787 transport_send_check_condition_and_sense(se_cmd,
788 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
789 transport_generic_free_cmd(se_cmd, 0);
790 }
791 }
792
793 static void
794 vhost_scsi_send_bad_target(struct vhost_scsi *vs,
795 struct vhost_virtqueue *vq,
796 int head, unsigned out)
797 {
798 struct virtio_scsi_cmd_resp __user *resp;
799 struct virtio_scsi_cmd_resp rsp;
800 int ret;
801
802 memset(&rsp, 0, sizeof(rsp));
803 rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
804 resp = vq->iov[out].iov_base;
805 ret = __copy_to_user(resp, &rsp, sizeof(rsp));
806 if (!ret)
807 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
808 else
809 pr_err("Faulted on virtio_scsi_cmd_resp\n");
810 }
811
812 static int
813 vhost_scsi_get_desc(struct vhost_scsi *vs, struct vhost_virtqueue *vq,
814 struct vhost_scsi_ctx *vc)
815 {
816 int ret = -ENXIO;
817
818 vc->head = vhost_get_vq_desc(vq, vq->iov,
819 ARRAY_SIZE(vq->iov), &vc->out, &vc->in,
820 NULL, NULL);
821
822 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
823 vc->head, vc->out, vc->in);
824
825
826 if (unlikely(vc->head < 0))
827 goto done;
828
829
830 if (vc->head == vq->num) {
831 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
832 vhost_disable_notify(&vs->dev, vq);
833 ret = -EAGAIN;
834 }
835 goto done;
836 }
837
838
839
840
841
842 vc->out_size = iov_length(vq->iov, vc->out);
843 vc->in_size = iov_length(&vq->iov[vc->out], vc->in);
844
845
846
847
848
849
850
851
852
853
854
855 iov_iter_init(&vc->out_iter, WRITE, vq->iov, vc->out, vc->out_size);
856 ret = 0;
857
858 done:
859 return ret;
860 }
861
862 static int
863 vhost_scsi_chk_size(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc)
864 {
865 if (unlikely(vc->in_size < vc->rsp_size)) {
866 vq_err(vq,
867 "Response buf too small, need min %zu bytes got %zu",
868 vc->rsp_size, vc->in_size);
869 return -EINVAL;
870 } else if (unlikely(vc->out_size < vc->req_size)) {
871 vq_err(vq,
872 "Request buf too small, need min %zu bytes got %zu",
873 vc->req_size, vc->out_size);
874 return -EIO;
875 }
876
877 return 0;
878 }
879
880 static int
881 vhost_scsi_get_req(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc,
882 struct vhost_scsi_tpg **tpgp)
883 {
884 int ret = -EIO;
885
886 if (unlikely(!copy_from_iter_full(vc->req, vc->req_size,
887 &vc->out_iter))) {
888 vq_err(vq, "Faulted on copy_from_iter_full\n");
889 } else if (unlikely(*vc->lunp != 1)) {
890
891 vq_err(vq, "Illegal virtio-scsi lun: %u\n", *vc->lunp);
892 } else {
893 struct vhost_scsi_tpg **vs_tpg, *tpg;
894
895 vs_tpg = vq->private_data;
896
897 tpg = READ_ONCE(vs_tpg[*vc->target]);
898 if (unlikely(!tpg)) {
899 vq_err(vq, "Target 0x%x does not exist\n", *vc->target);
900 } else {
901 if (tpgp)
902 *tpgp = tpg;
903 ret = 0;
904 }
905 }
906
907 return ret;
908 }
909
910 static void
911 vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
912 {
913 struct vhost_scsi_tpg **vs_tpg, *tpg;
914 struct virtio_scsi_cmd_req v_req;
915 struct virtio_scsi_cmd_req_pi v_req_pi;
916 struct vhost_scsi_ctx vc;
917 struct vhost_scsi_cmd *cmd;
918 struct iov_iter in_iter, prot_iter, data_iter;
919 u64 tag;
920 u32 exp_data_len, data_direction;
921 int ret, prot_bytes, c = 0;
922 u16 lun;
923 u8 task_attr;
924 bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI);
925 void *cdb;
926
927 mutex_lock(&vq->mutex);
928
929
930
931
932 vs_tpg = vq->private_data;
933 if (!vs_tpg)
934 goto out;
935
936 memset(&vc, 0, sizeof(vc));
937 vc.rsp_size = sizeof(struct virtio_scsi_cmd_resp);
938
939 vhost_disable_notify(&vs->dev, vq);
940
941 do {
942 ret = vhost_scsi_get_desc(vs, vq, &vc);
943 if (ret)
944 goto err;
945
946
947
948
949
950 if (t10_pi) {
951 vc.req = &v_req_pi;
952 vc.req_size = sizeof(v_req_pi);
953 vc.lunp = &v_req_pi.lun[0];
954 vc.target = &v_req_pi.lun[1];
955 } else {
956 vc.req = &v_req;
957 vc.req_size = sizeof(v_req);
958 vc.lunp = &v_req.lun[0];
959 vc.target = &v_req.lun[1];
960 }
961
962
963
964
965
966
967 ret = vhost_scsi_chk_size(vq, &vc);
968 if (ret)
969 goto err;
970
971 ret = vhost_scsi_get_req(vq, &vc, &tpg);
972 if (ret)
973 goto err;
974
975 ret = -EIO;
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992 prot_bytes = 0;
993
994 if (vc.out_size > vc.req_size) {
995 data_direction = DMA_TO_DEVICE;
996 exp_data_len = vc.out_size - vc.req_size;
997 data_iter = vc.out_iter;
998 } else if (vc.in_size > vc.rsp_size) {
999 data_direction = DMA_FROM_DEVICE;
1000 exp_data_len = vc.in_size - vc.rsp_size;
1001
1002 iov_iter_init(&in_iter, READ, &vq->iov[vc.out], vc.in,
1003 vc.rsp_size + exp_data_len);
1004 iov_iter_advance(&in_iter, vc.rsp_size);
1005 data_iter = in_iter;
1006 } else {
1007 data_direction = DMA_NONE;
1008 exp_data_len = 0;
1009 }
1010
1011
1012
1013
1014
1015 if (t10_pi) {
1016 if (v_req_pi.pi_bytesout) {
1017 if (data_direction != DMA_TO_DEVICE) {
1018 vq_err(vq, "Received non zero pi_bytesout,"
1019 " but wrong data_direction\n");
1020 goto err;
1021 }
1022 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout);
1023 } else if (v_req_pi.pi_bytesin) {
1024 if (data_direction != DMA_FROM_DEVICE) {
1025 vq_err(vq, "Received non zero pi_bytesin,"
1026 " but wrong data_direction\n");
1027 goto err;
1028 }
1029 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin);
1030 }
1031
1032
1033
1034
1035
1036
1037
1038
1039 if (prot_bytes) {
1040 exp_data_len -= prot_bytes;
1041 prot_iter = data_iter;
1042 iov_iter_truncate(&prot_iter, prot_bytes);
1043 iov_iter_advance(&data_iter, prot_bytes);
1044 }
1045 tag = vhost64_to_cpu(vq, v_req_pi.tag);
1046 task_attr = v_req_pi.task_attr;
1047 cdb = &v_req_pi.cdb[0];
1048 lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
1049 } else {
1050 tag = vhost64_to_cpu(vq, v_req.tag);
1051 task_attr = v_req.task_attr;
1052 cdb = &v_req.cdb[0];
1053 lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
1054 }
1055
1056
1057
1058
1059
1060
1061
1062 if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) {
1063 vq_err(vq, "Received SCSI CDB with command_size: %d that"
1064 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1065 scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE);
1066 goto err;
1067 }
1068 cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr,
1069 exp_data_len + prot_bytes,
1070 data_direction);
1071 if (IS_ERR(cmd)) {
1072 vq_err(vq, "vhost_scsi_get_tag failed %ld\n",
1073 PTR_ERR(cmd));
1074 goto err;
1075 }
1076 cmd->tvc_vhost = vs;
1077 cmd->tvc_vq = vq;
1078 cmd->tvc_resp_iov = vq->iov[vc.out];
1079 cmd->tvc_in_iovs = vc.in;
1080
1081 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
1082 cmd->tvc_cdb[0], cmd->tvc_lun);
1083 pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:"
1084 " %d\n", cmd, exp_data_len, prot_bytes, data_direction);
1085
1086 if (data_direction != DMA_NONE) {
1087 if (unlikely(vhost_scsi_mapal(cmd, prot_bytes,
1088 &prot_iter, exp_data_len,
1089 &data_iter))) {
1090 vq_err(vq, "Failed to map iov to sgl\n");
1091 vhost_scsi_release_cmd(&cmd->tvc_se_cmd);
1092 goto err;
1093 }
1094 }
1095
1096
1097
1098
1099
1100 cmd->tvc_vq_desc = vc.head;
1101
1102
1103
1104
1105
1106
1107 INIT_WORK(&cmd->work, vhost_scsi_submission_work);
1108 queue_work(vhost_scsi_workqueue, &cmd->work);
1109 ret = 0;
1110 err:
1111
1112
1113
1114
1115
1116
1117 if (ret == -ENXIO)
1118 break;
1119 else if (ret == -EIO)
1120 vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out);
1121 } while (likely(!vhost_exceeds_weight(vq, ++c, 0)));
1122 out:
1123 mutex_unlock(&vq->mutex);
1124 }
1125
1126 static void
1127 vhost_scsi_send_tmf_reject(struct vhost_scsi *vs,
1128 struct vhost_virtqueue *vq,
1129 struct vhost_scsi_ctx *vc)
1130 {
1131 struct virtio_scsi_ctrl_tmf_resp rsp;
1132 struct iov_iter iov_iter;
1133 int ret;
1134
1135 pr_debug("%s\n", __func__);
1136 memset(&rsp, 0, sizeof(rsp));
1137 rsp.response = VIRTIO_SCSI_S_FUNCTION_REJECTED;
1138
1139 iov_iter_init(&iov_iter, READ, &vq->iov[vc->out], vc->in, sizeof(rsp));
1140
1141 ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter);
1142 if (likely(ret == sizeof(rsp)))
1143 vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0);
1144 else
1145 pr_err("Faulted on virtio_scsi_ctrl_tmf_resp\n");
1146 }
1147
1148 static void
1149 vhost_scsi_send_an_resp(struct vhost_scsi *vs,
1150 struct vhost_virtqueue *vq,
1151 struct vhost_scsi_ctx *vc)
1152 {
1153 struct virtio_scsi_ctrl_an_resp rsp;
1154 struct iov_iter iov_iter;
1155 int ret;
1156
1157 pr_debug("%s\n", __func__);
1158 memset(&rsp, 0, sizeof(rsp));
1159 rsp.response = VIRTIO_SCSI_S_OK;
1160
1161 iov_iter_init(&iov_iter, READ, &vq->iov[vc->out], vc->in, sizeof(rsp));
1162
1163 ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter);
1164 if (likely(ret == sizeof(rsp)))
1165 vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0);
1166 else
1167 pr_err("Faulted on virtio_scsi_ctrl_an_resp\n");
1168 }
1169
1170 static void
1171 vhost_scsi_ctl_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
1172 {
1173 union {
1174 __virtio32 type;
1175 struct virtio_scsi_ctrl_an_req an;
1176 struct virtio_scsi_ctrl_tmf_req tmf;
1177 } v_req;
1178 struct vhost_scsi_ctx vc;
1179 size_t typ_size;
1180 int ret, c = 0;
1181
1182 mutex_lock(&vq->mutex);
1183
1184
1185
1186
1187 if (!vq->private_data)
1188 goto out;
1189
1190 memset(&vc, 0, sizeof(vc));
1191
1192 vhost_disable_notify(&vs->dev, vq);
1193
1194 do {
1195 ret = vhost_scsi_get_desc(vs, vq, &vc);
1196 if (ret)
1197 goto err;
1198
1199
1200
1201
1202
1203 vc.req = &v_req.type;
1204 typ_size = sizeof(v_req.type);
1205
1206 if (unlikely(!copy_from_iter_full(vc.req, typ_size,
1207 &vc.out_iter))) {
1208 vq_err(vq, "Faulted on copy_from_iter tmf type\n");
1209
1210
1211
1212
1213
1214
1215 continue;
1216 }
1217
1218 switch (v_req.type) {
1219 case VIRTIO_SCSI_T_TMF:
1220 vc.req = &v_req.tmf;
1221 vc.req_size = sizeof(struct virtio_scsi_ctrl_tmf_req);
1222 vc.rsp_size = sizeof(struct virtio_scsi_ctrl_tmf_resp);
1223 vc.lunp = &v_req.tmf.lun[0];
1224 vc.target = &v_req.tmf.lun[1];
1225 break;
1226 case VIRTIO_SCSI_T_AN_QUERY:
1227 case VIRTIO_SCSI_T_AN_SUBSCRIBE:
1228 vc.req = &v_req.an;
1229 vc.req_size = sizeof(struct virtio_scsi_ctrl_an_req);
1230 vc.rsp_size = sizeof(struct virtio_scsi_ctrl_an_resp);
1231 vc.lunp = &v_req.an.lun[0];
1232 vc.target = NULL;
1233 break;
1234 default:
1235 vq_err(vq, "Unknown control request %d", v_req.type);
1236 continue;
1237 }
1238
1239
1240
1241
1242
1243
1244 ret = vhost_scsi_chk_size(vq, &vc);
1245 if (ret)
1246 goto err;
1247
1248
1249
1250
1251 vc.req += typ_size;
1252 vc.req_size -= typ_size;
1253
1254 ret = vhost_scsi_get_req(vq, &vc, NULL);
1255 if (ret)
1256 goto err;
1257
1258 if (v_req.type == VIRTIO_SCSI_T_TMF)
1259 vhost_scsi_send_tmf_reject(vs, vq, &vc);
1260 else
1261 vhost_scsi_send_an_resp(vs, vq, &vc);
1262 err:
1263
1264
1265
1266
1267
1268
1269 if (ret == -ENXIO)
1270 break;
1271 else if (ret == -EIO)
1272 vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out);
1273 } while (likely(!vhost_exceeds_weight(vq, ++c, 0)));
1274 out:
1275 mutex_unlock(&vq->mutex);
1276 }
1277
1278 static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
1279 {
1280 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1281 poll.work);
1282 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1283
1284 pr_debug("%s: The handling func for control queue.\n", __func__);
1285 vhost_scsi_ctl_handle_vq(vs, vq);
1286 }
1287
1288 static void
1289 vhost_scsi_send_evt(struct vhost_scsi *vs,
1290 struct vhost_scsi_tpg *tpg,
1291 struct se_lun *lun,
1292 u32 event,
1293 u32 reason)
1294 {
1295 struct vhost_scsi_evt *evt;
1296
1297 evt = vhost_scsi_allocate_evt(vs, event, reason);
1298 if (!evt)
1299 return;
1300
1301 if (tpg && lun) {
1302
1303
1304
1305
1306
1307 evt->event.lun[0] = 0x01;
1308 evt->event.lun[1] = tpg->tport_tpgt;
1309 if (lun->unpacked_lun >= 256)
1310 evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
1311 evt->event.lun[3] = lun->unpacked_lun & 0xFF;
1312 }
1313
1314 llist_add(&evt->list, &vs->vs_event_list);
1315 vhost_work_queue(&vs->dev, &vs->vs_event_work);
1316 }
1317
1318 static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
1319 {
1320 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1321 poll.work);
1322 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1323
1324 mutex_lock(&vq->mutex);
1325 if (!vq->private_data)
1326 goto out;
1327
1328 if (vs->vs_events_missed)
1329 vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
1330 out:
1331 mutex_unlock(&vq->mutex);
1332 }
1333
1334 static void vhost_scsi_handle_kick(struct vhost_work *work)
1335 {
1336 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1337 poll.work);
1338 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1339
1340 vhost_scsi_handle_vq(vs, vq);
1341 }
1342
1343 static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
1344 {
1345 vhost_poll_flush(&vs->vqs[index].vq.poll);
1346 }
1347
1348
1349 static void vhost_scsi_flush(struct vhost_scsi *vs)
1350 {
1351 struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];
1352 int i;
1353
1354
1355 vhost_scsi_init_inflight(vs, old_inflight);
1356
1357
1358
1359
1360
1361
1362 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1363 kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight);
1364
1365
1366 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1367 vhost_scsi_flush_vq(vs, i);
1368 vhost_work_flush(&vs->dev, &vs->vs_completion_work);
1369 vhost_work_flush(&vs->dev, &vs->vs_event_work);
1370
1371
1372 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1373 wait_for_completion(&old_inflight[i]->comp);
1374 }
1375
1376
1377
1378
1379
1380
1381
1382
1383 static int
1384 vhost_scsi_set_endpoint(struct vhost_scsi *vs,
1385 struct vhost_scsi_target *t)
1386 {
1387 struct se_portal_group *se_tpg;
1388 struct vhost_scsi_tport *tv_tport;
1389 struct vhost_scsi_tpg *tpg;
1390 struct vhost_scsi_tpg **vs_tpg;
1391 struct vhost_virtqueue *vq;
1392 int index, ret, i, len;
1393 bool match = false;
1394
1395 mutex_lock(&vhost_scsi_mutex);
1396 mutex_lock(&vs->dev.mutex);
1397
1398
1399 for (index = 0; index < vs->dev.nvqs; ++index) {
1400
1401 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1402 ret = -EFAULT;
1403 goto out;
1404 }
1405 }
1406
1407 len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
1408 vs_tpg = kzalloc(len, GFP_KERNEL);
1409 if (!vs_tpg) {
1410 ret = -ENOMEM;
1411 goto out;
1412 }
1413 if (vs->vs_tpg)
1414 memcpy(vs_tpg, vs->vs_tpg, len);
1415
1416 list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) {
1417 mutex_lock(&tpg->tv_tpg_mutex);
1418 if (!tpg->tpg_nexus) {
1419 mutex_unlock(&tpg->tv_tpg_mutex);
1420 continue;
1421 }
1422 if (tpg->tv_tpg_vhost_count != 0) {
1423 mutex_unlock(&tpg->tv_tpg_mutex);
1424 continue;
1425 }
1426 tv_tport = tpg->tport;
1427
1428 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1429 if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
1430 kfree(vs_tpg);
1431 mutex_unlock(&tpg->tv_tpg_mutex);
1432 ret = -EEXIST;
1433 goto out;
1434 }
1435
1436
1437
1438
1439
1440
1441 se_tpg = &tpg->se_tpg;
1442 ret = target_depend_item(&se_tpg->tpg_group.cg_item);
1443 if (ret) {
1444 pr_warn("target_depend_item() failed: %d\n", ret);
1445 kfree(vs_tpg);
1446 mutex_unlock(&tpg->tv_tpg_mutex);
1447 goto out;
1448 }
1449 tpg->tv_tpg_vhost_count++;
1450 tpg->vhost_scsi = vs;
1451 vs_tpg[tpg->tport_tpgt] = tpg;
1452 match = true;
1453 }
1454 mutex_unlock(&tpg->tv_tpg_mutex);
1455 }
1456
1457 if (match) {
1458 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1459 sizeof(vs->vs_vhost_wwpn));
1460 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1461 vq = &vs->vqs[i].vq;
1462 mutex_lock(&vq->mutex);
1463 vq->private_data = vs_tpg;
1464 vhost_vq_init_access(vq);
1465 mutex_unlock(&vq->mutex);
1466 }
1467 ret = 0;
1468 } else {
1469 ret = -EEXIST;
1470 }
1471
1472
1473
1474
1475
1476 vhost_scsi_flush(vs);
1477 kfree(vs->vs_tpg);
1478 vs->vs_tpg = vs_tpg;
1479
1480 out:
1481 mutex_unlock(&vs->dev.mutex);
1482 mutex_unlock(&vhost_scsi_mutex);
1483 return ret;
1484 }
1485
1486 static int
1487 vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
1488 struct vhost_scsi_target *t)
1489 {
1490 struct se_portal_group *se_tpg;
1491 struct vhost_scsi_tport *tv_tport;
1492 struct vhost_scsi_tpg *tpg;
1493 struct vhost_virtqueue *vq;
1494 bool match = false;
1495 int index, ret, i;
1496 u8 target;
1497
1498 mutex_lock(&vhost_scsi_mutex);
1499 mutex_lock(&vs->dev.mutex);
1500
1501 for (index = 0; index < vs->dev.nvqs; ++index) {
1502 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1503 ret = -EFAULT;
1504 goto err_dev;
1505 }
1506 }
1507
1508 if (!vs->vs_tpg) {
1509 ret = 0;
1510 goto err_dev;
1511 }
1512
1513 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1514 target = i;
1515 tpg = vs->vs_tpg[target];
1516 if (!tpg)
1517 continue;
1518
1519 mutex_lock(&tpg->tv_tpg_mutex);
1520 tv_tport = tpg->tport;
1521 if (!tv_tport) {
1522 ret = -ENODEV;
1523 goto err_tpg;
1524 }
1525
1526 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1527 pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
1528 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
1529 tv_tport->tport_name, tpg->tport_tpgt,
1530 t->vhost_wwpn, t->vhost_tpgt);
1531 ret = -EINVAL;
1532 goto err_tpg;
1533 }
1534 tpg->tv_tpg_vhost_count--;
1535 tpg->vhost_scsi = NULL;
1536 vs->vs_tpg[target] = NULL;
1537 match = true;
1538 mutex_unlock(&tpg->tv_tpg_mutex);
1539
1540
1541
1542
1543 se_tpg = &tpg->se_tpg;
1544 target_undepend_item(&se_tpg->tpg_group.cg_item);
1545 }
1546 if (match) {
1547 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1548 vq = &vs->vqs[i].vq;
1549 mutex_lock(&vq->mutex);
1550 vq->private_data = NULL;
1551 mutex_unlock(&vq->mutex);
1552 }
1553 }
1554
1555
1556
1557
1558 vhost_scsi_flush(vs);
1559 kfree(vs->vs_tpg);
1560 vs->vs_tpg = NULL;
1561 WARN_ON(vs->vs_events_nr);
1562 mutex_unlock(&vs->dev.mutex);
1563 mutex_unlock(&vhost_scsi_mutex);
1564 return 0;
1565
1566 err_tpg:
1567 mutex_unlock(&tpg->tv_tpg_mutex);
1568 err_dev:
1569 mutex_unlock(&vs->dev.mutex);
1570 mutex_unlock(&vhost_scsi_mutex);
1571 return ret;
1572 }
1573
1574 static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1575 {
1576 struct vhost_virtqueue *vq;
1577 int i;
1578
1579 if (features & ~VHOST_SCSI_FEATURES)
1580 return -EOPNOTSUPP;
1581
1582 mutex_lock(&vs->dev.mutex);
1583 if ((features & (1 << VHOST_F_LOG_ALL)) &&
1584 !vhost_log_access_ok(&vs->dev)) {
1585 mutex_unlock(&vs->dev.mutex);
1586 return -EFAULT;
1587 }
1588
1589 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1590 vq = &vs->vqs[i].vq;
1591 mutex_lock(&vq->mutex);
1592 vq->acked_features = features;
1593 mutex_unlock(&vq->mutex);
1594 }
1595 mutex_unlock(&vs->dev.mutex);
1596 return 0;
1597 }
1598
1599 static int vhost_scsi_open(struct inode *inode, struct file *f)
1600 {
1601 struct vhost_scsi *vs;
1602 struct vhost_virtqueue **vqs;
1603 int r = -ENOMEM, i;
1604
1605 vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_RETRY_MAYFAIL);
1606 if (!vs) {
1607 vs = vzalloc(sizeof(*vs));
1608 if (!vs)
1609 goto err_vs;
1610 }
1611
1612 vqs = kmalloc_array(VHOST_SCSI_MAX_VQ, sizeof(*vqs), GFP_KERNEL);
1613 if (!vqs)
1614 goto err_vqs;
1615
1616 vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);
1617 vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);
1618
1619 vs->vs_events_nr = 0;
1620 vs->vs_events_missed = false;
1621
1622 vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
1623 vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1624 vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1625 vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
1626 for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
1627 vqs[i] = &vs->vqs[i].vq;
1628 vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
1629 }
1630 vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ, UIO_MAXIOV,
1631 VHOST_SCSI_WEIGHT, 0);
1632
1633 vhost_scsi_init_inflight(vs, NULL);
1634
1635 f->private_data = vs;
1636 return 0;
1637
1638 err_vqs:
1639 kvfree(vs);
1640 err_vs:
1641 return r;
1642 }
1643
1644 static int vhost_scsi_release(struct inode *inode, struct file *f)
1645 {
1646 struct vhost_scsi *vs = f->private_data;
1647 struct vhost_scsi_target t;
1648
1649 mutex_lock(&vs->dev.mutex);
1650 memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
1651 mutex_unlock(&vs->dev.mutex);
1652 vhost_scsi_clear_endpoint(vs, &t);
1653 vhost_dev_stop(&vs->dev);
1654 vhost_dev_cleanup(&vs->dev);
1655
1656 vhost_scsi_flush(vs);
1657 kfree(vs->dev.vqs);
1658 kvfree(vs);
1659 return 0;
1660 }
1661
1662 static long
1663 vhost_scsi_ioctl(struct file *f,
1664 unsigned int ioctl,
1665 unsigned long arg)
1666 {
1667 struct vhost_scsi *vs = f->private_data;
1668 struct vhost_scsi_target backend;
1669 void __user *argp = (void __user *)arg;
1670 u64 __user *featurep = argp;
1671 u32 __user *eventsp = argp;
1672 u32 events_missed;
1673 u64 features;
1674 int r, abi_version = VHOST_SCSI_ABI_VERSION;
1675 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1676
1677 switch (ioctl) {
1678 case VHOST_SCSI_SET_ENDPOINT:
1679 if (copy_from_user(&backend, argp, sizeof backend))
1680 return -EFAULT;
1681 if (backend.reserved != 0)
1682 return -EOPNOTSUPP;
1683
1684 return vhost_scsi_set_endpoint(vs, &backend);
1685 case VHOST_SCSI_CLEAR_ENDPOINT:
1686 if (copy_from_user(&backend, argp, sizeof backend))
1687 return -EFAULT;
1688 if (backend.reserved != 0)
1689 return -EOPNOTSUPP;
1690
1691 return vhost_scsi_clear_endpoint(vs, &backend);
1692 case VHOST_SCSI_GET_ABI_VERSION:
1693 if (copy_to_user(argp, &abi_version, sizeof abi_version))
1694 return -EFAULT;
1695 return 0;
1696 case VHOST_SCSI_SET_EVENTS_MISSED:
1697 if (get_user(events_missed, eventsp))
1698 return -EFAULT;
1699 mutex_lock(&vq->mutex);
1700 vs->vs_events_missed = events_missed;
1701 mutex_unlock(&vq->mutex);
1702 return 0;
1703 case VHOST_SCSI_GET_EVENTS_MISSED:
1704 mutex_lock(&vq->mutex);
1705 events_missed = vs->vs_events_missed;
1706 mutex_unlock(&vq->mutex);
1707 if (put_user(events_missed, eventsp))
1708 return -EFAULT;
1709 return 0;
1710 case VHOST_GET_FEATURES:
1711 features = VHOST_SCSI_FEATURES;
1712 if (copy_to_user(featurep, &features, sizeof features))
1713 return -EFAULT;
1714 return 0;
1715 case VHOST_SET_FEATURES:
1716 if (copy_from_user(&features, featurep, sizeof features))
1717 return -EFAULT;
1718 return vhost_scsi_set_features(vs, features);
1719 default:
1720 mutex_lock(&vs->dev.mutex);
1721 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
1722
1723 if (r == -ENOIOCTLCMD)
1724 r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
1725 mutex_unlock(&vs->dev.mutex);
1726 return r;
1727 }
1728 }
1729
1730 #ifdef CONFIG_COMPAT
1731 static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
1732 unsigned long arg)
1733 {
1734 return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
1735 }
1736 #endif
1737
1738 static const struct file_operations vhost_scsi_fops = {
1739 .owner = THIS_MODULE,
1740 .release = vhost_scsi_release,
1741 .unlocked_ioctl = vhost_scsi_ioctl,
1742 #ifdef CONFIG_COMPAT
1743 .compat_ioctl = vhost_scsi_compat_ioctl,
1744 #endif
1745 .open = vhost_scsi_open,
1746 .llseek = noop_llseek,
1747 };
1748
1749 static struct miscdevice vhost_scsi_misc = {
1750 MISC_DYNAMIC_MINOR,
1751 "vhost-scsi",
1752 &vhost_scsi_fops,
1753 };
1754
1755 static int __init vhost_scsi_register(void)
1756 {
1757 return misc_register(&vhost_scsi_misc);
1758 }
1759
1760 static void vhost_scsi_deregister(void)
1761 {
1762 misc_deregister(&vhost_scsi_misc);
1763 }
1764
1765 static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport)
1766 {
1767 switch (tport->tport_proto_id) {
1768 case SCSI_PROTOCOL_SAS:
1769 return "SAS";
1770 case SCSI_PROTOCOL_FCP:
1771 return "FCP";
1772 case SCSI_PROTOCOL_ISCSI:
1773 return "iSCSI";
1774 default:
1775 break;
1776 }
1777
1778 return "Unknown";
1779 }
1780
1781 static void
1782 vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg,
1783 struct se_lun *lun, bool plug)
1784 {
1785
1786 struct vhost_scsi *vs = tpg->vhost_scsi;
1787 struct vhost_virtqueue *vq;
1788 u32 reason;
1789
1790 if (!vs)
1791 return;
1792
1793 mutex_lock(&vs->dev.mutex);
1794
1795 if (plug)
1796 reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
1797 else
1798 reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
1799
1800 vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1801 mutex_lock(&vq->mutex);
1802 if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG))
1803 vhost_scsi_send_evt(vs, tpg, lun,
1804 VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
1805 mutex_unlock(&vq->mutex);
1806 mutex_unlock(&vs->dev.mutex);
1807 }
1808
1809 static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1810 {
1811 vhost_scsi_do_plug(tpg, lun, true);
1812 }
1813
1814 static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1815 {
1816 vhost_scsi_do_plug(tpg, lun, false);
1817 }
1818
1819 static int vhost_scsi_port_link(struct se_portal_group *se_tpg,
1820 struct se_lun *lun)
1821 {
1822 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1823 struct vhost_scsi_tpg, se_tpg);
1824
1825 mutex_lock(&vhost_scsi_mutex);
1826
1827 mutex_lock(&tpg->tv_tpg_mutex);
1828 tpg->tv_tpg_port_count++;
1829 mutex_unlock(&tpg->tv_tpg_mutex);
1830
1831 vhost_scsi_hotplug(tpg, lun);
1832
1833 mutex_unlock(&vhost_scsi_mutex);
1834
1835 return 0;
1836 }
1837
1838 static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
1839 struct se_lun *lun)
1840 {
1841 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1842 struct vhost_scsi_tpg, se_tpg);
1843
1844 mutex_lock(&vhost_scsi_mutex);
1845
1846 mutex_lock(&tpg->tv_tpg_mutex);
1847 tpg->tv_tpg_port_count--;
1848 mutex_unlock(&tpg->tv_tpg_mutex);
1849
1850 vhost_scsi_hotunplug(tpg, lun);
1851
1852 mutex_unlock(&vhost_scsi_mutex);
1853 }
1854
1855 static void vhost_scsi_free_cmd_map_res(struct se_session *se_sess)
1856 {
1857 struct vhost_scsi_cmd *tv_cmd;
1858 unsigned int i;
1859
1860 if (!se_sess->sess_cmd_map)
1861 return;
1862
1863 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1864 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1865
1866 kfree(tv_cmd->tvc_sgl);
1867 kfree(tv_cmd->tvc_prot_sgl);
1868 kfree(tv_cmd->tvc_upages);
1869 }
1870 }
1871
1872 static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store(
1873 struct config_item *item, const char *page, size_t count)
1874 {
1875 struct se_portal_group *se_tpg = attrib_to_tpg(item);
1876 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1877 struct vhost_scsi_tpg, se_tpg);
1878 unsigned long val;
1879 int ret = kstrtoul(page, 0, &val);
1880
1881 if (ret) {
1882 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
1883 return ret;
1884 }
1885 if (val != 0 && val != 1 && val != 3) {
1886 pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val);
1887 return -EINVAL;
1888 }
1889 tpg->tv_fabric_prot_type = val;
1890
1891 return count;
1892 }
1893
1894 static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show(
1895 struct config_item *item, char *page)
1896 {
1897 struct se_portal_group *se_tpg = attrib_to_tpg(item);
1898 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1899 struct vhost_scsi_tpg, se_tpg);
1900
1901 return sprintf(page, "%d\n", tpg->tv_fabric_prot_type);
1902 }
1903
1904 CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type);
1905
1906 static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = {
1907 &vhost_scsi_tpg_attrib_attr_fabric_prot_type,
1908 NULL,
1909 };
1910
1911 static int vhost_scsi_nexus_cb(struct se_portal_group *se_tpg,
1912 struct se_session *se_sess, void *p)
1913 {
1914 struct vhost_scsi_cmd *tv_cmd;
1915 unsigned int i;
1916
1917 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1918 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1919
1920 tv_cmd->tvc_sgl = kcalloc(VHOST_SCSI_PREALLOC_SGLS,
1921 sizeof(struct scatterlist),
1922 GFP_KERNEL);
1923 if (!tv_cmd->tvc_sgl) {
1924 pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
1925 goto out;
1926 }
1927
1928 tv_cmd->tvc_upages = kcalloc(VHOST_SCSI_PREALLOC_UPAGES,
1929 sizeof(struct page *),
1930 GFP_KERNEL);
1931 if (!tv_cmd->tvc_upages) {
1932 pr_err("Unable to allocate tv_cmd->tvc_upages\n");
1933 goto out;
1934 }
1935
1936 tv_cmd->tvc_prot_sgl = kcalloc(VHOST_SCSI_PREALLOC_PROT_SGLS,
1937 sizeof(struct scatterlist),
1938 GFP_KERNEL);
1939 if (!tv_cmd->tvc_prot_sgl) {
1940 pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
1941 goto out;
1942 }
1943 }
1944 return 0;
1945 out:
1946 vhost_scsi_free_cmd_map_res(se_sess);
1947 return -ENOMEM;
1948 }
1949
1950 static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
1951 const char *name)
1952 {
1953 struct vhost_scsi_nexus *tv_nexus;
1954
1955 mutex_lock(&tpg->tv_tpg_mutex);
1956 if (tpg->tpg_nexus) {
1957 mutex_unlock(&tpg->tv_tpg_mutex);
1958 pr_debug("tpg->tpg_nexus already exists\n");
1959 return -EEXIST;
1960 }
1961
1962 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1963 if (!tv_nexus) {
1964 mutex_unlock(&tpg->tv_tpg_mutex);
1965 pr_err("Unable to allocate struct vhost_scsi_nexus\n");
1966 return -ENOMEM;
1967 }
1968
1969
1970
1971
1972
1973 tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg,
1974 VHOST_SCSI_DEFAULT_TAGS,
1975 sizeof(struct vhost_scsi_cmd),
1976 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
1977 (unsigned char *)name, tv_nexus,
1978 vhost_scsi_nexus_cb);
1979 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1980 mutex_unlock(&tpg->tv_tpg_mutex);
1981 kfree(tv_nexus);
1982 return -ENOMEM;
1983 }
1984 tpg->tpg_nexus = tv_nexus;
1985
1986 mutex_unlock(&tpg->tv_tpg_mutex);
1987 return 0;
1988 }
1989
1990 static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
1991 {
1992 struct se_session *se_sess;
1993 struct vhost_scsi_nexus *tv_nexus;
1994
1995 mutex_lock(&tpg->tv_tpg_mutex);
1996 tv_nexus = tpg->tpg_nexus;
1997 if (!tv_nexus) {
1998 mutex_unlock(&tpg->tv_tpg_mutex);
1999 return -ENODEV;
2000 }
2001
2002 se_sess = tv_nexus->tvn_se_sess;
2003 if (!se_sess) {
2004 mutex_unlock(&tpg->tv_tpg_mutex);
2005 return -ENODEV;
2006 }
2007
2008 if (tpg->tv_tpg_port_count != 0) {
2009 mutex_unlock(&tpg->tv_tpg_mutex);
2010 pr_err("Unable to remove TCM_vhost I_T Nexus with"
2011 " active TPG port count: %d\n",
2012 tpg->tv_tpg_port_count);
2013 return -EBUSY;
2014 }
2015
2016 if (tpg->tv_tpg_vhost_count != 0) {
2017 mutex_unlock(&tpg->tv_tpg_mutex);
2018 pr_err("Unable to remove TCM_vhost I_T Nexus with"
2019 " active TPG vhost count: %d\n",
2020 tpg->tv_tpg_vhost_count);
2021 return -EBUSY;
2022 }
2023
2024 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
2025 " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport),
2026 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
2027
2028 vhost_scsi_free_cmd_map_res(se_sess);
2029
2030
2031
2032 target_remove_session(se_sess);
2033 tpg->tpg_nexus = NULL;
2034 mutex_unlock(&tpg->tv_tpg_mutex);
2035
2036 kfree(tv_nexus);
2037 return 0;
2038 }
2039
2040 static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page)
2041 {
2042 struct se_portal_group *se_tpg = to_tpg(item);
2043 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2044 struct vhost_scsi_tpg, se_tpg);
2045 struct vhost_scsi_nexus *tv_nexus;
2046 ssize_t ret;
2047
2048 mutex_lock(&tpg->tv_tpg_mutex);
2049 tv_nexus = tpg->tpg_nexus;
2050 if (!tv_nexus) {
2051 mutex_unlock(&tpg->tv_tpg_mutex);
2052 return -ENODEV;
2053 }
2054 ret = snprintf(page, PAGE_SIZE, "%s\n",
2055 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
2056 mutex_unlock(&tpg->tv_tpg_mutex);
2057
2058 return ret;
2059 }
2060
2061 static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item,
2062 const char *page, size_t count)
2063 {
2064 struct se_portal_group *se_tpg = to_tpg(item);
2065 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2066 struct vhost_scsi_tpg, se_tpg);
2067 struct vhost_scsi_tport *tport_wwn = tpg->tport;
2068 unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr;
2069 int ret;
2070
2071
2072
2073 if (!strncmp(page, "NULL", 4)) {
2074 ret = vhost_scsi_drop_nexus(tpg);
2075 return (!ret) ? count : ret;
2076 }
2077
2078
2079
2080
2081
2082 if (strlen(page) >= VHOST_SCSI_NAMELEN) {
2083 pr_err("Emulated NAA Sas Address: %s, exceeds"
2084 " max: %d\n", page, VHOST_SCSI_NAMELEN);
2085 return -EINVAL;
2086 }
2087 snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page);
2088
2089 ptr = strstr(i_port, "naa.");
2090 if (ptr) {
2091 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
2092 pr_err("Passed SAS Initiator Port %s does not"
2093 " match target port protoid: %s\n", i_port,
2094 vhost_scsi_dump_proto_id(tport_wwn));
2095 return -EINVAL;
2096 }
2097 port_ptr = &i_port[0];
2098 goto check_newline;
2099 }
2100 ptr = strstr(i_port, "fc.");
2101 if (ptr) {
2102 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
2103 pr_err("Passed FCP Initiator Port %s does not"
2104 " match target port protoid: %s\n", i_port,
2105 vhost_scsi_dump_proto_id(tport_wwn));
2106 return -EINVAL;
2107 }
2108 port_ptr = &i_port[3];
2109 goto check_newline;
2110 }
2111 ptr = strstr(i_port, "iqn.");
2112 if (ptr) {
2113 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
2114 pr_err("Passed iSCSI Initiator Port %s does not"
2115 " match target port protoid: %s\n", i_port,
2116 vhost_scsi_dump_proto_id(tport_wwn));
2117 return -EINVAL;
2118 }
2119 port_ptr = &i_port[0];
2120 goto check_newline;
2121 }
2122 pr_err("Unable to locate prefix for emulated Initiator Port:"
2123 " %s\n", i_port);
2124 return -EINVAL;
2125
2126
2127
2128 check_newline:
2129 if (i_port[strlen(i_port)-1] == '\n')
2130 i_port[strlen(i_port)-1] = '\0';
2131
2132 ret = vhost_scsi_make_nexus(tpg, port_ptr);
2133 if (ret < 0)
2134 return ret;
2135
2136 return count;
2137 }
2138
2139 CONFIGFS_ATTR(vhost_scsi_tpg_, nexus);
2140
2141 static struct configfs_attribute *vhost_scsi_tpg_attrs[] = {
2142 &vhost_scsi_tpg_attr_nexus,
2143 NULL,
2144 };
2145
2146 static struct se_portal_group *
2147 vhost_scsi_make_tpg(struct se_wwn *wwn, const char *name)
2148 {
2149 struct vhost_scsi_tport *tport = container_of(wwn,
2150 struct vhost_scsi_tport, tport_wwn);
2151
2152 struct vhost_scsi_tpg *tpg;
2153 u16 tpgt;
2154 int ret;
2155
2156 if (strstr(name, "tpgt_") != name)
2157 return ERR_PTR(-EINVAL);
2158 if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET)
2159 return ERR_PTR(-EINVAL);
2160
2161 tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
2162 if (!tpg) {
2163 pr_err("Unable to allocate struct vhost_scsi_tpg");
2164 return ERR_PTR(-ENOMEM);
2165 }
2166 mutex_init(&tpg->tv_tpg_mutex);
2167 INIT_LIST_HEAD(&tpg->tv_tpg_list);
2168 tpg->tport = tport;
2169 tpg->tport_tpgt = tpgt;
2170
2171 ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id);
2172 if (ret < 0) {
2173 kfree(tpg);
2174 return NULL;
2175 }
2176 mutex_lock(&vhost_scsi_mutex);
2177 list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list);
2178 mutex_unlock(&vhost_scsi_mutex);
2179
2180 return &tpg->se_tpg;
2181 }
2182
2183 static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg)
2184 {
2185 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2186 struct vhost_scsi_tpg, se_tpg);
2187
2188 mutex_lock(&vhost_scsi_mutex);
2189 list_del(&tpg->tv_tpg_list);
2190 mutex_unlock(&vhost_scsi_mutex);
2191
2192
2193
2194 vhost_scsi_drop_nexus(tpg);
2195
2196
2197
2198 core_tpg_deregister(se_tpg);
2199 kfree(tpg);
2200 }
2201
2202 static struct se_wwn *
2203 vhost_scsi_make_tport(struct target_fabric_configfs *tf,
2204 struct config_group *group,
2205 const char *name)
2206 {
2207 struct vhost_scsi_tport *tport;
2208 char *ptr;
2209 u64 wwpn = 0;
2210 int off = 0;
2211
2212
2213
2214
2215 tport = kzalloc(sizeof(*tport), GFP_KERNEL);
2216 if (!tport) {
2217 pr_err("Unable to allocate struct vhost_scsi_tport");
2218 return ERR_PTR(-ENOMEM);
2219 }
2220 tport->tport_wwpn = wwpn;
2221
2222
2223
2224
2225 ptr = strstr(name, "naa.");
2226 if (ptr) {
2227 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
2228 goto check_len;
2229 }
2230 ptr = strstr(name, "fc.");
2231 if (ptr) {
2232 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
2233 off = 3;
2234 goto check_len;
2235 }
2236 ptr = strstr(name, "iqn.");
2237 if (ptr) {
2238 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
2239 goto check_len;
2240 }
2241
2242 pr_err("Unable to locate prefix for emulated Target Port:"
2243 " %s\n", name);
2244 kfree(tport);
2245 return ERR_PTR(-EINVAL);
2246
2247 check_len:
2248 if (strlen(name) >= VHOST_SCSI_NAMELEN) {
2249 pr_err("Emulated %s Address: %s, exceeds"
2250 " max: %d\n", name, vhost_scsi_dump_proto_id(tport),
2251 VHOST_SCSI_NAMELEN);
2252 kfree(tport);
2253 return ERR_PTR(-EINVAL);
2254 }
2255 snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]);
2256
2257 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
2258 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name);
2259
2260 return &tport->tport_wwn;
2261 }
2262
2263 static void vhost_scsi_drop_tport(struct se_wwn *wwn)
2264 {
2265 struct vhost_scsi_tport *tport = container_of(wwn,
2266 struct vhost_scsi_tport, tport_wwn);
2267
2268 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
2269 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport),
2270 tport->tport_name);
2271
2272 kfree(tport);
2273 }
2274
2275 static ssize_t
2276 vhost_scsi_wwn_version_show(struct config_item *item, char *page)
2277 {
2278 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
2279 "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2280 utsname()->machine);
2281 }
2282
2283 CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version);
2284
2285 static struct configfs_attribute *vhost_scsi_wwn_attrs[] = {
2286 &vhost_scsi_wwn_attr_version,
2287 NULL,
2288 };
2289
2290 static const struct target_core_fabric_ops vhost_scsi_ops = {
2291 .module = THIS_MODULE,
2292 .fabric_name = "vhost",
2293 .tpg_get_wwn = vhost_scsi_get_fabric_wwn,
2294 .tpg_get_tag = vhost_scsi_get_tpgt,
2295 .tpg_check_demo_mode = vhost_scsi_check_true,
2296 .tpg_check_demo_mode_cache = vhost_scsi_check_true,
2297 .tpg_check_demo_mode_write_protect = vhost_scsi_check_false,
2298 .tpg_check_prod_mode_write_protect = vhost_scsi_check_false,
2299 .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only,
2300 .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index,
2301 .release_cmd = vhost_scsi_release_cmd,
2302 .check_stop_free = vhost_scsi_check_stop_free,
2303 .sess_get_index = vhost_scsi_sess_get_index,
2304 .sess_get_initiator_sid = NULL,
2305 .write_pending = vhost_scsi_write_pending,
2306 .set_default_node_attributes = vhost_scsi_set_default_node_attrs,
2307 .get_cmd_state = vhost_scsi_get_cmd_state,
2308 .queue_data_in = vhost_scsi_queue_data_in,
2309 .queue_status = vhost_scsi_queue_status,
2310 .queue_tm_rsp = vhost_scsi_queue_tm_rsp,
2311 .aborted_task = vhost_scsi_aborted_task,
2312
2313
2314
2315 .fabric_make_wwn = vhost_scsi_make_tport,
2316 .fabric_drop_wwn = vhost_scsi_drop_tport,
2317 .fabric_make_tpg = vhost_scsi_make_tpg,
2318 .fabric_drop_tpg = vhost_scsi_drop_tpg,
2319 .fabric_post_link = vhost_scsi_port_link,
2320 .fabric_pre_unlink = vhost_scsi_port_unlink,
2321
2322 .tfc_wwn_attrs = vhost_scsi_wwn_attrs,
2323 .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs,
2324 .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs,
2325 };
2326
2327 static int __init vhost_scsi_init(void)
2328 {
2329 int ret = -ENOMEM;
2330
2331 pr_debug("TCM_VHOST fabric module %s on %s/%s"
2332 " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2333 utsname()->machine);
2334
2335
2336
2337
2338
2339 vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0);
2340 if (!vhost_scsi_workqueue)
2341 goto out;
2342
2343 ret = vhost_scsi_register();
2344 if (ret < 0)
2345 goto out_destroy_workqueue;
2346
2347 ret = target_register_template(&vhost_scsi_ops);
2348 if (ret < 0)
2349 goto out_vhost_scsi_deregister;
2350
2351 return 0;
2352
2353 out_vhost_scsi_deregister:
2354 vhost_scsi_deregister();
2355 out_destroy_workqueue:
2356 destroy_workqueue(vhost_scsi_workqueue);
2357 out:
2358 return ret;
2359 };
2360
2361 static void vhost_scsi_exit(void)
2362 {
2363 target_unregister_template(&vhost_scsi_ops);
2364 vhost_scsi_deregister();
2365 destroy_workqueue(vhost_scsi_workqueue);
2366 };
2367
2368 MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2369 MODULE_ALIAS("tcm_vhost");
2370 MODULE_LICENSE("GPL");
2371 module_init(vhost_scsi_init);
2372 module_exit(vhost_scsi_exit);