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1// SPDX-License-Identifier: GPL-2.0+
2/*******************************************************************************
3 * Vhost kernel TCM fabric driver for virtio SCSI initiators
4 *
5 * (C) Copyright 2010-2013 Datera, Inc.
6 * (C) Copyright 2010-2012 IBM Corp.
7 *
8 * Authors: Nicholas A. Bellinger <nab@daterainc.com>
9 * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
10 ****************************************************************************/
11
12#include <linux/module.h>
13#include <linux/moduleparam.h>
14#include <generated/utsrelease.h>
15#include <linux/utsname.h>
16#include <linux/init.h>
17#include <linux/slab.h>
18#include <linux/kthread.h>
19#include <linux/types.h>
20#include <linux/string.h>
21#include <linux/configfs.h>
22#include <linux/ctype.h>
23#include <linux/compat.h>
24#include <linux/eventfd.h>
25#include <linux/fs.h>
26#include <linux/vmalloc.h>
27#include <linux/miscdevice.h>
28#include <linux/blk_types.h>
29#include <linux/bio.h>
30#include <asm/unaligned.h>
31#include <scsi/scsi_common.h>
32#include <scsi/scsi_proto.h>
33#include <target/target_core_base.h>
34#include <target/target_core_fabric.h>
35#include <linux/vhost.h>
36#include <linux/virtio_scsi.h>
37#include <linux/llist.h>
38#include <linux/bitmap.h>
39
40#include "vhost.h"
41
42#define VHOST_SCSI_VERSION "v0.1"
43#define VHOST_SCSI_NAMELEN 256
44#define VHOST_SCSI_MAX_CDB_SIZE 32
45#define VHOST_SCSI_PREALLOC_SGLS 2048
46#define VHOST_SCSI_PREALLOC_UPAGES 2048
47#define VHOST_SCSI_PREALLOC_PROT_SGLS 2048
48
49/* Max number of requests before requeueing the job.
50 * Using this limit prevents one virtqueue from starving others with
51 * request.
52 */
53#define VHOST_SCSI_WEIGHT 256
54
55struct vhost_scsi_inflight {
56 /* Wait for the flush operation to finish */
57 struct completion comp;
58 /* Refcount for the inflight reqs */
59 struct kref kref;
60};
61
62struct vhost_scsi_cmd {
63 /* Descriptor from vhost_get_vq_desc() for virt_queue segment */
64 int tvc_vq_desc;
65 /* virtio-scsi initiator task attribute */
66 int tvc_task_attr;
67 /* virtio-scsi response incoming iovecs */
68 int tvc_in_iovs;
69 /* virtio-scsi initiator data direction */
70 enum dma_data_direction tvc_data_direction;
71 /* Expected data transfer length from virtio-scsi header */
72 u32 tvc_exp_data_len;
73 /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
74 u64 tvc_tag;
75 /* The number of scatterlists associated with this cmd */
76 u32 tvc_sgl_count;
77 u32 tvc_prot_sgl_count;
78 /* Saved unpacked SCSI LUN for vhost_scsi_target_queue_cmd() */
79 u32 tvc_lun;
80 u32 copied_iov:1;
81 const void *saved_iter_addr;
82 struct iov_iter saved_iter;
83 /* Pointer to the SGL formatted memory from virtio-scsi */
84 struct scatterlist *tvc_sgl;
85 struct scatterlist *tvc_prot_sgl;
86 struct page **tvc_upages;
87 /* Pointer to response header iovec */
88 struct iovec *tvc_resp_iov;
89 /* Pointer to vhost_scsi for our device */
90 struct vhost_scsi *tvc_vhost;
91 /* Pointer to vhost_virtqueue for the cmd */
92 struct vhost_virtqueue *tvc_vq;
93 /* Pointer to vhost nexus memory */
94 struct vhost_scsi_nexus *tvc_nexus;
95 /* The TCM I/O descriptor that is accessed via container_of() */
96 struct se_cmd tvc_se_cmd;
97 /* Copy of the incoming SCSI command descriptor block (CDB) */
98 unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE];
99 /* Sense buffer that will be mapped into outgoing status */
100 unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
101 /* Completed commands list, serviced from vhost worker thread */
102 struct llist_node tvc_completion_list;
103 /* Used to track inflight cmd */
104 struct vhost_scsi_inflight *inflight;
105};
106
107struct vhost_scsi_nexus {
108 /* Pointer to TCM session for I_T Nexus */
109 struct se_session *tvn_se_sess;
110};
111
112struct vhost_scsi_tpg {
113 /* Vhost port target portal group tag for TCM */
114 u16 tport_tpgt;
115 /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
116 int tv_tpg_port_count;
117 /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
118 int tv_tpg_vhost_count;
119 /* Used for enabling T10-PI with legacy devices */
120 int tv_fabric_prot_type;
121 /* list for vhost_scsi_list */
122 struct list_head tv_tpg_list;
123 /* Used to protect access for tpg_nexus */
124 struct mutex tv_tpg_mutex;
125 /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
126 struct vhost_scsi_nexus *tpg_nexus;
127 /* Pointer back to vhost_scsi_tport */
128 struct vhost_scsi_tport *tport;
129 /* Returned by vhost_scsi_make_tpg() */
130 struct se_portal_group se_tpg;
131 /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */
132 struct vhost_scsi *vhost_scsi;
133};
134
135struct vhost_scsi_tport {
136 /* SCSI protocol the tport is providing */
137 u8 tport_proto_id;
138 /* Binary World Wide unique Port Name for Vhost Target port */
139 u64 tport_wwpn;
140 /* ASCII formatted WWPN for Vhost Target port */
141 char tport_name[VHOST_SCSI_NAMELEN];
142 /* Returned by vhost_scsi_make_tport() */
143 struct se_wwn tport_wwn;
144};
145
146struct vhost_scsi_evt {
147 /* event to be sent to guest */
148 struct virtio_scsi_event event;
149 /* event list, serviced from vhost worker thread */
150 struct llist_node list;
151};
152
153enum {
154 VHOST_SCSI_VQ_CTL = 0,
155 VHOST_SCSI_VQ_EVT = 1,
156 VHOST_SCSI_VQ_IO = 2,
157};
158
159/* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */
160enum {
161 VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
162 (1ULL << VIRTIO_SCSI_F_T10_PI)
163};
164
165#define VHOST_SCSI_MAX_TARGET 256
166#define VHOST_SCSI_MAX_IO_VQ 1024
167#define VHOST_SCSI_MAX_EVENT 128
168
169static unsigned vhost_scsi_max_io_vqs = 128;
170module_param_named(max_io_vqs, vhost_scsi_max_io_vqs, uint, 0644);
171MODULE_PARM_DESC(max_io_vqs, "Set the max number of IO virtqueues a vhost scsi device can support. The default is 128. The max is 1024.");
172
173struct vhost_scsi_virtqueue {
174 struct vhost_virtqueue vq;
175 struct vhost_scsi *vs;
176 /*
177 * Reference counting for inflight reqs, used for flush operation. At
178 * each time, one reference tracks new commands submitted, while we
179 * wait for another one to reach 0.
180 */
181 struct vhost_scsi_inflight inflights[2];
182 /*
183 * Indicate current inflight in use, protected by vq->mutex.
184 * Writers must also take dev mutex and flush under it.
185 */
186 int inflight_idx;
187 struct vhost_scsi_cmd *scsi_cmds;
188 struct sbitmap scsi_tags;
189 int max_cmds;
190
191 struct vhost_work completion_work;
192 struct llist_head completion_list;
193};
194
195struct vhost_scsi {
196 /* Protected by vhost_scsi->dev.mutex */
197 struct vhost_scsi_tpg **vs_tpg;
198 char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
199
200 struct vhost_dev dev;
201 struct vhost_scsi_virtqueue *vqs;
202 struct vhost_scsi_inflight **old_inflight;
203
204 struct vhost_work vs_event_work; /* evt injection work item */
205 struct llist_head vs_event_list; /* evt injection queue */
206
207 bool vs_events_missed; /* any missed events, protected by vq->mutex */
208 int vs_events_nr; /* num of pending events, protected by vq->mutex */
209};
210
211struct vhost_scsi_tmf {
212 struct vhost_work vwork;
213 struct vhost_scsi *vhost;
214 struct vhost_scsi_virtqueue *svq;
215
216 struct se_cmd se_cmd;
217 u8 scsi_resp;
218 struct vhost_scsi_inflight *inflight;
219 struct iovec resp_iov;
220 int in_iovs;
221 int vq_desc;
222};
223
224/*
225 * Context for processing request and control queue operations.
226 */
227struct vhost_scsi_ctx {
228 int head;
229 unsigned int out, in;
230 size_t req_size, rsp_size;
231 size_t out_size, in_size;
232 u8 *target, *lunp;
233 void *req;
234 struct iov_iter out_iter;
235};
236
237/*
238 * Global mutex to protect vhost_scsi TPG list for vhost IOCTLs and LIO
239 * configfs management operations.
240 */
241static DEFINE_MUTEX(vhost_scsi_mutex);
242static LIST_HEAD(vhost_scsi_list);
243
244static void vhost_scsi_done_inflight(struct kref *kref)
245{
246 struct vhost_scsi_inflight *inflight;
247
248 inflight = container_of(kref, struct vhost_scsi_inflight, kref);
249 complete(&inflight->comp);
250}
251
252static void vhost_scsi_init_inflight(struct vhost_scsi *vs,
253 struct vhost_scsi_inflight *old_inflight[])
254{
255 struct vhost_scsi_inflight *new_inflight;
256 struct vhost_virtqueue *vq;
257 int idx, i;
258
259 for (i = 0; i < vs->dev.nvqs; i++) {
260 vq = &vs->vqs[i].vq;
261
262 mutex_lock(&vq->mutex);
263
264 /* store old infight */
265 idx = vs->vqs[i].inflight_idx;
266 if (old_inflight)
267 old_inflight[i] = &vs->vqs[i].inflights[idx];
268
269 /* setup new infight */
270 vs->vqs[i].inflight_idx = idx ^ 1;
271 new_inflight = &vs->vqs[i].inflights[idx ^ 1];
272 kref_init(&new_inflight->kref);
273 init_completion(&new_inflight->comp);
274
275 mutex_unlock(&vq->mutex);
276 }
277}
278
279static struct vhost_scsi_inflight *
280vhost_scsi_get_inflight(struct vhost_virtqueue *vq)
281{
282 struct vhost_scsi_inflight *inflight;
283 struct vhost_scsi_virtqueue *svq;
284
285 svq = container_of(vq, struct vhost_scsi_virtqueue, vq);
286 inflight = &svq->inflights[svq->inflight_idx];
287 kref_get(&inflight->kref);
288
289 return inflight;
290}
291
292static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight)
293{
294 kref_put(&inflight->kref, vhost_scsi_done_inflight);
295}
296
297static int vhost_scsi_check_true(struct se_portal_group *se_tpg)
298{
299 return 1;
300}
301
302static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg)
303{
304 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
305 struct vhost_scsi_tpg, se_tpg);
306 struct vhost_scsi_tport *tport = tpg->tport;
307
308 return &tport->tport_name[0];
309}
310
311static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg)
312{
313 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
314 struct vhost_scsi_tpg, se_tpg);
315 return tpg->tport_tpgt;
316}
317
318static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg)
319{
320 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
321 struct vhost_scsi_tpg, se_tpg);
322
323 return tpg->tv_fabric_prot_type;
324}
325
326static void vhost_scsi_release_cmd_res(struct se_cmd *se_cmd)
327{
328 struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd,
329 struct vhost_scsi_cmd, tvc_se_cmd);
330 struct vhost_scsi_virtqueue *svq = container_of(tv_cmd->tvc_vq,
331 struct vhost_scsi_virtqueue, vq);
332 struct vhost_scsi_inflight *inflight = tv_cmd->inflight;
333 int i;
334
335 if (tv_cmd->tvc_sgl_count) {
336 for (i = 0; i < tv_cmd->tvc_sgl_count; i++) {
337 if (tv_cmd->copied_iov)
338 __free_page(sg_page(&tv_cmd->tvc_sgl[i]));
339 else
340 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
341 }
342 kfree(tv_cmd->saved_iter_addr);
343 }
344 if (tv_cmd->tvc_prot_sgl_count) {
345 for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++)
346 put_page(sg_page(&tv_cmd->tvc_prot_sgl[i]));
347 }
348
349 sbitmap_clear_bit(&svq->scsi_tags, se_cmd->map_tag);
350 vhost_scsi_put_inflight(inflight);
351}
352
353static void vhost_scsi_release_tmf_res(struct vhost_scsi_tmf *tmf)
354{
355 struct vhost_scsi_inflight *inflight = tmf->inflight;
356
357 kfree(tmf);
358 vhost_scsi_put_inflight(inflight);
359}
360
361static void vhost_scsi_release_cmd(struct se_cmd *se_cmd)
362{
363 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) {
364 struct vhost_scsi_tmf *tmf = container_of(se_cmd,
365 struct vhost_scsi_tmf, se_cmd);
366 struct vhost_virtqueue *vq = &tmf->svq->vq;
367
368 vhost_vq_work_queue(vq, &tmf->vwork);
369 } else {
370 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
371 struct vhost_scsi_cmd, tvc_se_cmd);
372 struct vhost_scsi_virtqueue *svq = container_of(cmd->tvc_vq,
373 struct vhost_scsi_virtqueue, vq);
374
375 llist_add(&cmd->tvc_completion_list, &svq->completion_list);
376 vhost_vq_work_queue(&svq->vq, &svq->completion_work);
377 }
378}
379
380static int vhost_scsi_write_pending(struct se_cmd *se_cmd)
381{
382 /* Go ahead and process the write immediately */
383 target_execute_cmd(se_cmd);
384 return 0;
385}
386
387static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd)
388{
389 transport_generic_free_cmd(se_cmd, 0);
390 return 0;
391}
392
393static int vhost_scsi_queue_status(struct se_cmd *se_cmd)
394{
395 transport_generic_free_cmd(se_cmd, 0);
396 return 0;
397}
398
399static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd)
400{
401 struct vhost_scsi_tmf *tmf = container_of(se_cmd, struct vhost_scsi_tmf,
402 se_cmd);
403
404 tmf->scsi_resp = se_cmd->se_tmr_req->response;
405 transport_generic_free_cmd(&tmf->se_cmd, 0);
406}
407
408static void vhost_scsi_aborted_task(struct se_cmd *se_cmd)
409{
410 return;
411}
412
413static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
414{
415 vs->vs_events_nr--;
416 kfree(evt);
417}
418
419static struct vhost_scsi_evt *
420vhost_scsi_allocate_evt(struct vhost_scsi *vs,
421 u32 event, u32 reason)
422{
423 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
424 struct vhost_scsi_evt *evt;
425
426 if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
427 vs->vs_events_missed = true;
428 return NULL;
429 }
430
431 evt = kzalloc(sizeof(*evt), GFP_KERNEL);
432 if (!evt) {
433 vq_err(vq, "Failed to allocate vhost_scsi_evt\n");
434 vs->vs_events_missed = true;
435 return NULL;
436 }
437
438 evt->event.event = cpu_to_vhost32(vq, event);
439 evt->event.reason = cpu_to_vhost32(vq, reason);
440 vs->vs_events_nr++;
441
442 return evt;
443}
444
445static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
446{
447 return target_put_sess_cmd(se_cmd);
448}
449
450static void
451vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
452{
453 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
454 struct virtio_scsi_event *event = &evt->event;
455 struct virtio_scsi_event __user *eventp;
456 unsigned out, in;
457 int head, ret;
458
459 if (!vhost_vq_get_backend(vq)) {
460 vs->vs_events_missed = true;
461 return;
462 }
463
464again:
465 vhost_disable_notify(&vs->dev, vq);
466 head = vhost_get_vq_desc(vq, vq->iov,
467 ARRAY_SIZE(vq->iov), &out, &in,
468 NULL, NULL);
469 if (head < 0) {
470 vs->vs_events_missed = true;
471 return;
472 }
473 if (head == vq->num) {
474 if (vhost_enable_notify(&vs->dev, vq))
475 goto again;
476 vs->vs_events_missed = true;
477 return;
478 }
479
480 if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
481 vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
482 vq->iov[out].iov_len);
483 vs->vs_events_missed = true;
484 return;
485 }
486
487 if (vs->vs_events_missed) {
488 event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED);
489 vs->vs_events_missed = false;
490 }
491
492 eventp = vq->iov[out].iov_base;
493 ret = __copy_to_user(eventp, event, sizeof(*event));
494 if (!ret)
495 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
496 else
497 vq_err(vq, "Faulted on vhost_scsi_send_event\n");
498}
499
500static void vhost_scsi_evt_work(struct vhost_work *work)
501{
502 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
503 vs_event_work);
504 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
505 struct vhost_scsi_evt *evt, *t;
506 struct llist_node *llnode;
507
508 mutex_lock(&vq->mutex);
509 llnode = llist_del_all(&vs->vs_event_list);
510 llist_for_each_entry_safe(evt, t, llnode, list) {
511 vhost_scsi_do_evt_work(vs, evt);
512 vhost_scsi_free_evt(vs, evt);
513 }
514 mutex_unlock(&vq->mutex);
515}
516
517static int vhost_scsi_copy_sgl_to_iov(struct vhost_scsi_cmd *cmd)
518{
519 struct iov_iter *iter = &cmd->saved_iter;
520 struct scatterlist *sg = cmd->tvc_sgl;
521 struct page *page;
522 size_t len;
523 int i;
524
525 for (i = 0; i < cmd->tvc_sgl_count; i++) {
526 page = sg_page(&sg[i]);
527 len = sg[i].length;
528
529 if (copy_page_to_iter(page, 0, len, iter) != len) {
530 pr_err("Could not copy data while handling misaligned cmd. Error %zu\n",
531 len);
532 return -1;
533 }
534 }
535
536 return 0;
537}
538
539/* Fill in status and signal that we are done processing this command
540 *
541 * This is scheduled in the vhost work queue so we are called with the owner
542 * process mm and can access the vring.
543 */
544static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
545{
546 struct vhost_scsi_virtqueue *svq = container_of(work,
547 struct vhost_scsi_virtqueue, completion_work);
548 struct virtio_scsi_cmd_resp v_rsp;
549 struct vhost_scsi_cmd *cmd, *t;
550 struct llist_node *llnode;
551 struct se_cmd *se_cmd;
552 struct iov_iter iov_iter;
553 bool signal = false;
554 int ret;
555
556 llnode = llist_del_all(&svq->completion_list);
557 llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) {
558 se_cmd = &cmd->tvc_se_cmd;
559
560 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
561 cmd, se_cmd->residual_count, se_cmd->scsi_status);
562 memset(&v_rsp, 0, sizeof(v_rsp));
563
564 if (cmd->saved_iter_addr && vhost_scsi_copy_sgl_to_iov(cmd)) {
565 v_rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
566 } else {
567 v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq,
568 se_cmd->residual_count);
569 /* TODO is status_qualifier field needed? */
570 v_rsp.status = se_cmd->scsi_status;
571 v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq,
572 se_cmd->scsi_sense_length);
573 memcpy(v_rsp.sense, cmd->tvc_sense_buf,
574 se_cmd->scsi_sense_length);
575 }
576
577 iov_iter_init(&iov_iter, ITER_DEST, cmd->tvc_resp_iov,
578 cmd->tvc_in_iovs, sizeof(v_rsp));
579 ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter);
580 if (likely(ret == sizeof(v_rsp))) {
581 signal = true;
582
583 vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
584 } else
585 pr_err("Faulted on virtio_scsi_cmd_resp\n");
586
587 vhost_scsi_release_cmd_res(se_cmd);
588 }
589
590 if (signal)
591 vhost_signal(&svq->vs->dev, &svq->vq);
592}
593
594static struct vhost_scsi_cmd *
595vhost_scsi_get_cmd(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg,
596 unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
597 u32 exp_data_len, int data_direction)
598{
599 struct vhost_scsi_virtqueue *svq = container_of(vq,
600 struct vhost_scsi_virtqueue, vq);
601 struct vhost_scsi_cmd *cmd;
602 struct vhost_scsi_nexus *tv_nexus;
603 struct scatterlist *sg, *prot_sg;
604 struct iovec *tvc_resp_iov;
605 struct page **pages;
606 int tag;
607
608 tv_nexus = tpg->tpg_nexus;
609 if (!tv_nexus) {
610 pr_err("Unable to locate active struct vhost_scsi_nexus\n");
611 return ERR_PTR(-EIO);
612 }
613
614 tag = sbitmap_get(&svq->scsi_tags);
615 if (tag < 0) {
616 pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
617 return ERR_PTR(-ENOMEM);
618 }
619
620 cmd = &svq->scsi_cmds[tag];
621 sg = cmd->tvc_sgl;
622 prot_sg = cmd->tvc_prot_sgl;
623 pages = cmd->tvc_upages;
624 tvc_resp_iov = cmd->tvc_resp_iov;
625 memset(cmd, 0, sizeof(*cmd));
626 cmd->tvc_sgl = sg;
627 cmd->tvc_prot_sgl = prot_sg;
628 cmd->tvc_upages = pages;
629 cmd->tvc_se_cmd.map_tag = tag;
630 cmd->tvc_tag = scsi_tag;
631 cmd->tvc_lun = lun;
632 cmd->tvc_task_attr = task_attr;
633 cmd->tvc_exp_data_len = exp_data_len;
634 cmd->tvc_data_direction = data_direction;
635 cmd->tvc_nexus = tv_nexus;
636 cmd->inflight = vhost_scsi_get_inflight(vq);
637 cmd->tvc_resp_iov = tvc_resp_iov;
638
639 memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE);
640
641 return cmd;
642}
643
644/*
645 * Map a user memory range into a scatterlist
646 *
647 * Returns the number of scatterlist entries used or -errno on error.
648 */
649static int
650vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd,
651 struct iov_iter *iter,
652 struct scatterlist *sgl,
653 bool is_prot)
654{
655 struct page **pages = cmd->tvc_upages;
656 struct scatterlist *sg = sgl;
657 ssize_t bytes, mapped_bytes;
658 size_t offset, mapped_offset;
659 unsigned int npages = 0;
660
661 bytes = iov_iter_get_pages2(iter, pages, LONG_MAX,
662 VHOST_SCSI_PREALLOC_UPAGES, &offset);
663 /* No pages were pinned */
664 if (bytes <= 0)
665 return bytes < 0 ? bytes : -EFAULT;
666
667 mapped_bytes = bytes;
668 mapped_offset = offset;
669
670 while (bytes) {
671 unsigned n = min_t(unsigned, PAGE_SIZE - offset, bytes);
672 /*
673 * The block layer requires bios/requests to be a multiple of
674 * 512 bytes, but Windows can send us vecs that are misaligned.
675 * This can result in bios and later requests with misaligned
676 * sizes if we have to break up a cmd/scatterlist into multiple
677 * bios.
678 *
679 * We currently only break up a command into multiple bios if
680 * we hit the vec/seg limit, so check if our sgl_count is
681 * greater than the max and if a vec in the cmd has a
682 * misaligned offset/size.
683 */
684 if (!is_prot &&
685 (offset & (SECTOR_SIZE - 1) || n & (SECTOR_SIZE - 1)) &&
686 cmd->tvc_sgl_count > BIO_MAX_VECS) {
687 WARN_ONCE(true,
688 "vhost-scsi detected misaligned IO. Performance may be degraded.");
689 goto revert_iter_get_pages;
690 }
691
692 sg_set_page(sg++, pages[npages++], n, offset);
693 bytes -= n;
694 offset = 0;
695 }
696
697 return npages;
698
699revert_iter_get_pages:
700 iov_iter_revert(iter, mapped_bytes);
701
702 npages = 0;
703 while (mapped_bytes) {
704 unsigned int n = min_t(unsigned int, PAGE_SIZE - mapped_offset,
705 mapped_bytes);
706
707 put_page(pages[npages++]);
708
709 mapped_bytes -= n;
710 mapped_offset = 0;
711 }
712
713 return -EINVAL;
714}
715
716static int
717vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls)
718{
719 int sgl_count = 0;
720
721 if (!iter || !iter_iov(iter)) {
722 pr_err("%s: iter->iov is NULL, but expected bytes: %zu"
723 " present\n", __func__, bytes);
724 return -EINVAL;
725 }
726
727 sgl_count = iov_iter_npages(iter, 0xffff);
728 if (sgl_count > max_sgls) {
729 pr_err("%s: requested sgl_count: %d exceeds pre-allocated"
730 " max_sgls: %d\n", __func__, sgl_count, max_sgls);
731 return -EINVAL;
732 }
733 return sgl_count;
734}
735
736static int
737vhost_scsi_copy_iov_to_sgl(struct vhost_scsi_cmd *cmd, struct iov_iter *iter,
738 struct scatterlist *sg, int sg_count)
739{
740 size_t len = iov_iter_count(iter);
741 unsigned int nbytes = 0;
742 struct page *page;
743 int i;
744
745 if (cmd->tvc_data_direction == DMA_FROM_DEVICE) {
746 cmd->saved_iter_addr = dup_iter(&cmd->saved_iter, iter,
747 GFP_KERNEL);
748 if (!cmd->saved_iter_addr)
749 return -ENOMEM;
750 }
751
752 for (i = 0; i < sg_count; i++) {
753 page = alloc_page(GFP_KERNEL);
754 if (!page) {
755 i--;
756 goto err;
757 }
758
759 nbytes = min_t(unsigned int, PAGE_SIZE, len);
760 sg_set_page(&sg[i], page, nbytes, 0);
761
762 if (cmd->tvc_data_direction == DMA_TO_DEVICE &&
763 copy_page_from_iter(page, 0, nbytes, iter) != nbytes)
764 goto err;
765
766 len -= nbytes;
767 }
768
769 cmd->copied_iov = 1;
770 return 0;
771
772err:
773 pr_err("Could not read %u bytes while handling misaligned cmd\n",
774 nbytes);
775
776 for (; i >= 0; i--)
777 __free_page(sg_page(&sg[i]));
778 kfree(cmd->saved_iter_addr);
779 return -ENOMEM;
780}
781
782static int
783vhost_scsi_map_iov_to_sgl(struct vhost_scsi_cmd *cmd, struct iov_iter *iter,
784 struct scatterlist *sg, int sg_count, bool is_prot)
785{
786 struct scatterlist *p = sg;
787 size_t revert_bytes;
788 int ret;
789
790 while (iov_iter_count(iter)) {
791 ret = vhost_scsi_map_to_sgl(cmd, iter, sg, is_prot);
792 if (ret < 0) {
793 revert_bytes = 0;
794
795 while (p < sg) {
796 struct page *page = sg_page(p);
797
798 if (page) {
799 put_page(page);
800 revert_bytes += p->length;
801 }
802 p++;
803 }
804
805 iov_iter_revert(iter, revert_bytes);
806 return ret;
807 }
808 sg += ret;
809 }
810
811 return 0;
812}
813
814static int
815vhost_scsi_mapal(struct vhost_scsi_cmd *cmd,
816 size_t prot_bytes, struct iov_iter *prot_iter,
817 size_t data_bytes, struct iov_iter *data_iter)
818{
819 int sgl_count, ret;
820
821 if (prot_bytes) {
822 sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes,
823 VHOST_SCSI_PREALLOC_PROT_SGLS);
824 if (sgl_count < 0)
825 return sgl_count;
826
827 sg_init_table(cmd->tvc_prot_sgl, sgl_count);
828 cmd->tvc_prot_sgl_count = sgl_count;
829 pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
830 cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count);
831
832 ret = vhost_scsi_map_iov_to_sgl(cmd, prot_iter,
833 cmd->tvc_prot_sgl,
834 cmd->tvc_prot_sgl_count, true);
835 if (ret < 0) {
836 cmd->tvc_prot_sgl_count = 0;
837 return ret;
838 }
839 }
840 sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes,
841 VHOST_SCSI_PREALLOC_SGLS);
842 if (sgl_count < 0)
843 return sgl_count;
844
845 sg_init_table(cmd->tvc_sgl, sgl_count);
846 cmd->tvc_sgl_count = sgl_count;
847 pr_debug("%s data_sg %p data_sgl_count %u\n", __func__,
848 cmd->tvc_sgl, cmd->tvc_sgl_count);
849
850 ret = vhost_scsi_map_iov_to_sgl(cmd, data_iter, cmd->tvc_sgl,
851 cmd->tvc_sgl_count, false);
852 if (ret == -EINVAL) {
853 sg_init_table(cmd->tvc_sgl, cmd->tvc_sgl_count);
854 ret = vhost_scsi_copy_iov_to_sgl(cmd, data_iter, cmd->tvc_sgl,
855 cmd->tvc_sgl_count);
856 }
857
858 if (ret < 0) {
859 cmd->tvc_sgl_count = 0;
860 return ret;
861 }
862 return 0;
863}
864
865static int vhost_scsi_to_tcm_attr(int attr)
866{
867 switch (attr) {
868 case VIRTIO_SCSI_S_SIMPLE:
869 return TCM_SIMPLE_TAG;
870 case VIRTIO_SCSI_S_ORDERED:
871 return TCM_ORDERED_TAG;
872 case VIRTIO_SCSI_S_HEAD:
873 return TCM_HEAD_TAG;
874 case VIRTIO_SCSI_S_ACA:
875 return TCM_ACA_TAG;
876 default:
877 break;
878 }
879 return TCM_SIMPLE_TAG;
880}
881
882static void vhost_scsi_target_queue_cmd(struct vhost_scsi_cmd *cmd)
883{
884 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
885 struct vhost_scsi_nexus *tv_nexus;
886 struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
887
888 /* FIXME: BIDI operation */
889 if (cmd->tvc_sgl_count) {
890 sg_ptr = cmd->tvc_sgl;
891
892 if (cmd->tvc_prot_sgl_count)
893 sg_prot_ptr = cmd->tvc_prot_sgl;
894 else
895 se_cmd->prot_pto = true;
896 } else {
897 sg_ptr = NULL;
898 }
899 tv_nexus = cmd->tvc_nexus;
900
901 se_cmd->tag = 0;
902 target_init_cmd(se_cmd, tv_nexus->tvn_se_sess, &cmd->tvc_sense_buf[0],
903 cmd->tvc_lun, cmd->tvc_exp_data_len,
904 vhost_scsi_to_tcm_attr(cmd->tvc_task_attr),
905 cmd->tvc_data_direction, TARGET_SCF_ACK_KREF);
906
907 if (target_submit_prep(se_cmd, cmd->tvc_cdb, sg_ptr,
908 cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr,
909 cmd->tvc_prot_sgl_count, GFP_KERNEL))
910 return;
911
912 target_submit(se_cmd);
913}
914
915static void
916vhost_scsi_send_bad_target(struct vhost_scsi *vs,
917 struct vhost_virtqueue *vq,
918 int head, unsigned out)
919{
920 struct virtio_scsi_cmd_resp __user *resp;
921 struct virtio_scsi_cmd_resp rsp;
922 int ret;
923
924 memset(&rsp, 0, sizeof(rsp));
925 rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
926 resp = vq->iov[out].iov_base;
927 ret = __copy_to_user(resp, &rsp, sizeof(rsp));
928 if (!ret)
929 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
930 else
931 pr_err("Faulted on virtio_scsi_cmd_resp\n");
932}
933
934static int
935vhost_scsi_get_desc(struct vhost_scsi *vs, struct vhost_virtqueue *vq,
936 struct vhost_scsi_ctx *vc)
937{
938 int ret = -ENXIO;
939
940 vc->head = vhost_get_vq_desc(vq, vq->iov,
941 ARRAY_SIZE(vq->iov), &vc->out, &vc->in,
942 NULL, NULL);
943
944 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
945 vc->head, vc->out, vc->in);
946
947 /* On error, stop handling until the next kick. */
948 if (unlikely(vc->head < 0))
949 goto done;
950
951 /* Nothing new? Wait for eventfd to tell us they refilled. */
952 if (vc->head == vq->num) {
953 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
954 vhost_disable_notify(&vs->dev, vq);
955 ret = -EAGAIN;
956 }
957 goto done;
958 }
959
960 /*
961 * Get the size of request and response buffers.
962 * FIXME: Not correct for BIDI operation
963 */
964 vc->out_size = iov_length(vq->iov, vc->out);
965 vc->in_size = iov_length(&vq->iov[vc->out], vc->in);
966
967 /*
968 * Copy over the virtio-scsi request header, which for a
969 * ANY_LAYOUT enabled guest may span multiple iovecs, or a
970 * single iovec may contain both the header + outgoing
971 * WRITE payloads.
972 *
973 * copy_from_iter() will advance out_iter, so that it will
974 * point at the start of the outgoing WRITE payload, if
975 * DMA_TO_DEVICE is set.
976 */
977 iov_iter_init(&vc->out_iter, ITER_SOURCE, vq->iov, vc->out, vc->out_size);
978 ret = 0;
979
980done:
981 return ret;
982}
983
984static int
985vhost_scsi_chk_size(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc)
986{
987 if (unlikely(vc->in_size < vc->rsp_size)) {
988 vq_err(vq,
989 "Response buf too small, need min %zu bytes got %zu",
990 vc->rsp_size, vc->in_size);
991 return -EINVAL;
992 } else if (unlikely(vc->out_size < vc->req_size)) {
993 vq_err(vq,
994 "Request buf too small, need min %zu bytes got %zu",
995 vc->req_size, vc->out_size);
996 return -EIO;
997 }
998
999 return 0;
1000}
1001
1002static int
1003vhost_scsi_get_req(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc,
1004 struct vhost_scsi_tpg **tpgp)
1005{
1006 int ret = -EIO;
1007
1008 if (unlikely(!copy_from_iter_full(vc->req, vc->req_size,
1009 &vc->out_iter))) {
1010 vq_err(vq, "Faulted on copy_from_iter_full\n");
1011 } else if (unlikely(*vc->lunp != 1)) {
1012 /* virtio-scsi spec requires byte 0 of the lun to be 1 */
1013 vq_err(vq, "Illegal virtio-scsi lun: %u\n", *vc->lunp);
1014 } else {
1015 struct vhost_scsi_tpg **vs_tpg, *tpg;
1016
1017 vs_tpg = vhost_vq_get_backend(vq); /* validated at handler entry */
1018
1019 tpg = READ_ONCE(vs_tpg[*vc->target]);
1020 if (unlikely(!tpg)) {
1021 vq_err(vq, "Target 0x%x does not exist\n", *vc->target);
1022 } else {
1023 if (tpgp)
1024 *tpgp = tpg;
1025 ret = 0;
1026 }
1027 }
1028
1029 return ret;
1030}
1031
1032static u16 vhost_buf_to_lun(u8 *lun_buf)
1033{
1034 return ((lun_buf[2] << 8) | lun_buf[3]) & 0x3FFF;
1035}
1036
1037static void
1038vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
1039{
1040 struct vhost_scsi_tpg **vs_tpg, *tpg;
1041 struct virtio_scsi_cmd_req v_req;
1042 struct virtio_scsi_cmd_req_pi v_req_pi;
1043 struct vhost_scsi_ctx vc;
1044 struct vhost_scsi_cmd *cmd;
1045 struct iov_iter in_iter, prot_iter, data_iter;
1046 u64 tag;
1047 u32 exp_data_len, data_direction;
1048 int ret, prot_bytes, i, c = 0;
1049 u16 lun;
1050 u8 task_attr;
1051 bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI);
1052 void *cdb;
1053
1054 mutex_lock(&vq->mutex);
1055 /*
1056 * We can handle the vq only after the endpoint is setup by calling the
1057 * VHOST_SCSI_SET_ENDPOINT ioctl.
1058 */
1059 vs_tpg = vhost_vq_get_backend(vq);
1060 if (!vs_tpg)
1061 goto out;
1062
1063 memset(&vc, 0, sizeof(vc));
1064 vc.rsp_size = sizeof(struct virtio_scsi_cmd_resp);
1065
1066 vhost_disable_notify(&vs->dev, vq);
1067
1068 do {
1069 ret = vhost_scsi_get_desc(vs, vq, &vc);
1070 if (ret)
1071 goto err;
1072
1073 /*
1074 * Setup pointers and values based upon different virtio-scsi
1075 * request header if T10_PI is enabled in KVM guest.
1076 */
1077 if (t10_pi) {
1078 vc.req = &v_req_pi;
1079 vc.req_size = sizeof(v_req_pi);
1080 vc.lunp = &v_req_pi.lun[0];
1081 vc.target = &v_req_pi.lun[1];
1082 } else {
1083 vc.req = &v_req;
1084 vc.req_size = sizeof(v_req);
1085 vc.lunp = &v_req.lun[0];
1086 vc.target = &v_req.lun[1];
1087 }
1088
1089 /*
1090 * Validate the size of request and response buffers.
1091 * Check for a sane response buffer so we can report
1092 * early errors back to the guest.
1093 */
1094 ret = vhost_scsi_chk_size(vq, &vc);
1095 if (ret)
1096 goto err;
1097
1098 ret = vhost_scsi_get_req(vq, &vc, &tpg);
1099 if (ret)
1100 goto err;
1101
1102 ret = -EIO; /* bad target on any error from here on */
1103
1104 /*
1105 * Determine data_direction by calculating the total outgoing
1106 * iovec sizes + incoming iovec sizes vs. virtio-scsi request +
1107 * response headers respectively.
1108 *
1109 * For DMA_TO_DEVICE this is out_iter, which is already pointing
1110 * to the right place.
1111 *
1112 * For DMA_FROM_DEVICE, the iovec will be just past the end
1113 * of the virtio-scsi response header in either the same
1114 * or immediately following iovec.
1115 *
1116 * Any associated T10_PI bytes for the outgoing / incoming
1117 * payloads are included in calculation of exp_data_len here.
1118 */
1119 prot_bytes = 0;
1120
1121 if (vc.out_size > vc.req_size) {
1122 data_direction = DMA_TO_DEVICE;
1123 exp_data_len = vc.out_size - vc.req_size;
1124 data_iter = vc.out_iter;
1125 } else if (vc.in_size > vc.rsp_size) {
1126 data_direction = DMA_FROM_DEVICE;
1127 exp_data_len = vc.in_size - vc.rsp_size;
1128
1129 iov_iter_init(&in_iter, ITER_DEST, &vq->iov[vc.out], vc.in,
1130 vc.rsp_size + exp_data_len);
1131 iov_iter_advance(&in_iter, vc.rsp_size);
1132 data_iter = in_iter;
1133 } else {
1134 data_direction = DMA_NONE;
1135 exp_data_len = 0;
1136 }
1137 /*
1138 * If T10_PI header + payload is present, setup prot_iter values
1139 * and recalculate data_iter for vhost_scsi_mapal() mapping to
1140 * host scatterlists via get_user_pages_fast().
1141 */
1142 if (t10_pi) {
1143 if (v_req_pi.pi_bytesout) {
1144 if (data_direction != DMA_TO_DEVICE) {
1145 vq_err(vq, "Received non zero pi_bytesout,"
1146 " but wrong data_direction\n");
1147 goto err;
1148 }
1149 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout);
1150 } else if (v_req_pi.pi_bytesin) {
1151 if (data_direction != DMA_FROM_DEVICE) {
1152 vq_err(vq, "Received non zero pi_bytesin,"
1153 " but wrong data_direction\n");
1154 goto err;
1155 }
1156 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin);
1157 }
1158 /*
1159 * Set prot_iter to data_iter and truncate it to
1160 * prot_bytes, and advance data_iter past any
1161 * preceding prot_bytes that may be present.
1162 *
1163 * Also fix up the exp_data_len to reflect only the
1164 * actual data payload length.
1165 */
1166 if (prot_bytes) {
1167 exp_data_len -= prot_bytes;
1168 prot_iter = data_iter;
1169 iov_iter_truncate(&prot_iter, prot_bytes);
1170 iov_iter_advance(&data_iter, prot_bytes);
1171 }
1172 tag = vhost64_to_cpu(vq, v_req_pi.tag);
1173 task_attr = v_req_pi.task_attr;
1174 cdb = &v_req_pi.cdb[0];
1175 lun = vhost_buf_to_lun(v_req_pi.lun);
1176 } else {
1177 tag = vhost64_to_cpu(vq, v_req.tag);
1178 task_attr = v_req.task_attr;
1179 cdb = &v_req.cdb[0];
1180 lun = vhost_buf_to_lun(v_req.lun);
1181 }
1182 /*
1183 * Check that the received CDB size does not exceeded our
1184 * hardcoded max for vhost-scsi, then get a pre-allocated
1185 * cmd descriptor for the new virtio-scsi tag.
1186 *
1187 * TODO what if cdb was too small for varlen cdb header?
1188 */
1189 if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) {
1190 vq_err(vq, "Received SCSI CDB with command_size: %d that"
1191 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1192 scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE);
1193 goto err;
1194 }
1195 cmd = vhost_scsi_get_cmd(vq, tpg, cdb, tag, lun, task_attr,
1196 exp_data_len + prot_bytes,
1197 data_direction);
1198 if (IS_ERR(cmd)) {
1199 vq_err(vq, "vhost_scsi_get_cmd failed %ld\n",
1200 PTR_ERR(cmd));
1201 goto err;
1202 }
1203 cmd->tvc_vhost = vs;
1204 cmd->tvc_vq = vq;
1205 for (i = 0; i < vc.in ; i++)
1206 cmd->tvc_resp_iov[i] = vq->iov[vc.out + i];
1207 cmd->tvc_in_iovs = vc.in;
1208
1209 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
1210 cmd->tvc_cdb[0], cmd->tvc_lun);
1211 pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:"
1212 " %d\n", cmd, exp_data_len, prot_bytes, data_direction);
1213
1214 if (data_direction != DMA_NONE) {
1215 if (unlikely(vhost_scsi_mapal(cmd, prot_bytes,
1216 &prot_iter, exp_data_len,
1217 &data_iter))) {
1218 vq_err(vq, "Failed to map iov to sgl\n");
1219 vhost_scsi_release_cmd_res(&cmd->tvc_se_cmd);
1220 goto err;
1221 }
1222 }
1223 /*
1224 * Save the descriptor from vhost_get_vq_desc() to be used to
1225 * complete the virtio-scsi request in TCM callback context via
1226 * vhost_scsi_queue_data_in() and vhost_scsi_queue_status()
1227 */
1228 cmd->tvc_vq_desc = vc.head;
1229 vhost_scsi_target_queue_cmd(cmd);
1230 ret = 0;
1231err:
1232 /*
1233 * ENXIO: No more requests, or read error, wait for next kick
1234 * EINVAL: Invalid response buffer, drop the request
1235 * EIO: Respond with bad target
1236 * EAGAIN: Pending request
1237 */
1238 if (ret == -ENXIO)
1239 break;
1240 else if (ret == -EIO)
1241 vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out);
1242 } while (likely(!vhost_exceeds_weight(vq, ++c, 0)));
1243out:
1244 mutex_unlock(&vq->mutex);
1245}
1246
1247static void
1248vhost_scsi_send_tmf_resp(struct vhost_scsi *vs, struct vhost_virtqueue *vq,
1249 int in_iovs, int vq_desc, struct iovec *resp_iov,
1250 int tmf_resp_code)
1251{
1252 struct virtio_scsi_ctrl_tmf_resp rsp;
1253 struct iov_iter iov_iter;
1254 int ret;
1255
1256 pr_debug("%s\n", __func__);
1257 memset(&rsp, 0, sizeof(rsp));
1258 rsp.response = tmf_resp_code;
1259
1260 iov_iter_init(&iov_iter, ITER_DEST, resp_iov, in_iovs, sizeof(rsp));
1261
1262 ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter);
1263 if (likely(ret == sizeof(rsp)))
1264 vhost_add_used_and_signal(&vs->dev, vq, vq_desc, 0);
1265 else
1266 pr_err("Faulted on virtio_scsi_ctrl_tmf_resp\n");
1267}
1268
1269static void vhost_scsi_tmf_resp_work(struct vhost_work *work)
1270{
1271 struct vhost_scsi_tmf *tmf = container_of(work, struct vhost_scsi_tmf,
1272 vwork);
1273 struct vhost_virtqueue *ctl_vq, *vq;
1274 int resp_code, i;
1275
1276 if (tmf->scsi_resp == TMR_FUNCTION_COMPLETE) {
1277 /*
1278 * Flush IO vqs that don't share a worker with the ctl to make
1279 * sure they have sent their responses before us.
1280 */
1281 ctl_vq = &tmf->vhost->vqs[VHOST_SCSI_VQ_CTL].vq;
1282 for (i = VHOST_SCSI_VQ_IO; i < tmf->vhost->dev.nvqs; i++) {
1283 vq = &tmf->vhost->vqs[i].vq;
1284
1285 if (vhost_vq_is_setup(vq) &&
1286 vq->worker != ctl_vq->worker)
1287 vhost_vq_flush(vq);
1288 }
1289
1290 resp_code = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
1291 } else {
1292 resp_code = VIRTIO_SCSI_S_FUNCTION_REJECTED;
1293 }
1294
1295 vhost_scsi_send_tmf_resp(tmf->vhost, &tmf->svq->vq, tmf->in_iovs,
1296 tmf->vq_desc, &tmf->resp_iov, resp_code);
1297 vhost_scsi_release_tmf_res(tmf);
1298}
1299
1300static void
1301vhost_scsi_handle_tmf(struct vhost_scsi *vs, struct vhost_scsi_tpg *tpg,
1302 struct vhost_virtqueue *vq,
1303 struct virtio_scsi_ctrl_tmf_req *vtmf,
1304 struct vhost_scsi_ctx *vc)
1305{
1306 struct vhost_scsi_virtqueue *svq = container_of(vq,
1307 struct vhost_scsi_virtqueue, vq);
1308 struct vhost_scsi_tmf *tmf;
1309
1310 if (vhost32_to_cpu(vq, vtmf->subtype) !=
1311 VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET)
1312 goto send_reject;
1313
1314 if (!tpg->tpg_nexus || !tpg->tpg_nexus->tvn_se_sess) {
1315 pr_err("Unable to locate active struct vhost_scsi_nexus for LUN RESET.\n");
1316 goto send_reject;
1317 }
1318
1319 tmf = kzalloc(sizeof(*tmf), GFP_KERNEL);
1320 if (!tmf)
1321 goto send_reject;
1322
1323 vhost_work_init(&tmf->vwork, vhost_scsi_tmf_resp_work);
1324 tmf->vhost = vs;
1325 tmf->svq = svq;
1326 tmf->resp_iov = vq->iov[vc->out];
1327 tmf->vq_desc = vc->head;
1328 tmf->in_iovs = vc->in;
1329 tmf->inflight = vhost_scsi_get_inflight(vq);
1330
1331 if (target_submit_tmr(&tmf->se_cmd, tpg->tpg_nexus->tvn_se_sess, NULL,
1332 vhost_buf_to_lun(vtmf->lun), NULL,
1333 TMR_LUN_RESET, GFP_KERNEL, 0,
1334 TARGET_SCF_ACK_KREF) < 0) {
1335 vhost_scsi_release_tmf_res(tmf);
1336 goto send_reject;
1337 }
1338
1339 return;
1340
1341send_reject:
1342 vhost_scsi_send_tmf_resp(vs, vq, vc->in, vc->head, &vq->iov[vc->out],
1343 VIRTIO_SCSI_S_FUNCTION_REJECTED);
1344}
1345
1346static void
1347vhost_scsi_send_an_resp(struct vhost_scsi *vs,
1348 struct vhost_virtqueue *vq,
1349 struct vhost_scsi_ctx *vc)
1350{
1351 struct virtio_scsi_ctrl_an_resp rsp;
1352 struct iov_iter iov_iter;
1353 int ret;
1354
1355 pr_debug("%s\n", __func__);
1356 memset(&rsp, 0, sizeof(rsp)); /* event_actual = 0 */
1357 rsp.response = VIRTIO_SCSI_S_OK;
1358
1359 iov_iter_init(&iov_iter, ITER_DEST, &vq->iov[vc->out], vc->in, sizeof(rsp));
1360
1361 ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter);
1362 if (likely(ret == sizeof(rsp)))
1363 vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0);
1364 else
1365 pr_err("Faulted on virtio_scsi_ctrl_an_resp\n");
1366}
1367
1368static void
1369vhost_scsi_ctl_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
1370{
1371 struct vhost_scsi_tpg *tpg;
1372 union {
1373 __virtio32 type;
1374 struct virtio_scsi_ctrl_an_req an;
1375 struct virtio_scsi_ctrl_tmf_req tmf;
1376 } v_req;
1377 struct vhost_scsi_ctx vc;
1378 size_t typ_size;
1379 int ret, c = 0;
1380
1381 mutex_lock(&vq->mutex);
1382 /*
1383 * We can handle the vq only after the endpoint is setup by calling the
1384 * VHOST_SCSI_SET_ENDPOINT ioctl.
1385 */
1386 if (!vhost_vq_get_backend(vq))
1387 goto out;
1388
1389 memset(&vc, 0, sizeof(vc));
1390
1391 vhost_disable_notify(&vs->dev, vq);
1392
1393 do {
1394 ret = vhost_scsi_get_desc(vs, vq, &vc);
1395 if (ret)
1396 goto err;
1397
1398 /*
1399 * Get the request type first in order to setup
1400 * other parameters dependent on the type.
1401 */
1402 vc.req = &v_req.type;
1403 typ_size = sizeof(v_req.type);
1404
1405 if (unlikely(!copy_from_iter_full(vc.req, typ_size,
1406 &vc.out_iter))) {
1407 vq_err(vq, "Faulted on copy_from_iter tmf type\n");
1408 /*
1409 * The size of the response buffer depends on the
1410 * request type and must be validated against it.
1411 * Since the request type is not known, don't send
1412 * a response.
1413 */
1414 continue;
1415 }
1416
1417 switch (vhost32_to_cpu(vq, v_req.type)) {
1418 case VIRTIO_SCSI_T_TMF:
1419 vc.req = &v_req.tmf;
1420 vc.req_size = sizeof(struct virtio_scsi_ctrl_tmf_req);
1421 vc.rsp_size = sizeof(struct virtio_scsi_ctrl_tmf_resp);
1422 vc.lunp = &v_req.tmf.lun[0];
1423 vc.target = &v_req.tmf.lun[1];
1424 break;
1425 case VIRTIO_SCSI_T_AN_QUERY:
1426 case VIRTIO_SCSI_T_AN_SUBSCRIBE:
1427 vc.req = &v_req.an;
1428 vc.req_size = sizeof(struct virtio_scsi_ctrl_an_req);
1429 vc.rsp_size = sizeof(struct virtio_scsi_ctrl_an_resp);
1430 vc.lunp = &v_req.an.lun[0];
1431 vc.target = NULL;
1432 break;
1433 default:
1434 vq_err(vq, "Unknown control request %d", v_req.type);
1435 continue;
1436 }
1437
1438 /*
1439 * Validate the size of request and response buffers.
1440 * Check for a sane response buffer so we can report
1441 * early errors back to the guest.
1442 */
1443 ret = vhost_scsi_chk_size(vq, &vc);
1444 if (ret)
1445 goto err;
1446
1447 /*
1448 * Get the rest of the request now that its size is known.
1449 */
1450 vc.req += typ_size;
1451 vc.req_size -= typ_size;
1452
1453 ret = vhost_scsi_get_req(vq, &vc, &tpg);
1454 if (ret)
1455 goto err;
1456
1457 if (v_req.type == VIRTIO_SCSI_T_TMF)
1458 vhost_scsi_handle_tmf(vs, tpg, vq, &v_req.tmf, &vc);
1459 else
1460 vhost_scsi_send_an_resp(vs, vq, &vc);
1461err:
1462 /*
1463 * ENXIO: No more requests, or read error, wait for next kick
1464 * EINVAL: Invalid response buffer, drop the request
1465 * EIO: Respond with bad target
1466 * EAGAIN: Pending request
1467 */
1468 if (ret == -ENXIO)
1469 break;
1470 else if (ret == -EIO)
1471 vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out);
1472 } while (likely(!vhost_exceeds_weight(vq, ++c, 0)));
1473out:
1474 mutex_unlock(&vq->mutex);
1475}
1476
1477static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
1478{
1479 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1480 poll.work);
1481 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1482
1483 pr_debug("%s: The handling func for control queue.\n", __func__);
1484 vhost_scsi_ctl_handle_vq(vs, vq);
1485}
1486
1487static void
1488vhost_scsi_send_evt(struct vhost_scsi *vs, struct vhost_virtqueue *vq,
1489 struct vhost_scsi_tpg *tpg, struct se_lun *lun,
1490 u32 event, u32 reason)
1491{
1492 struct vhost_scsi_evt *evt;
1493
1494 evt = vhost_scsi_allocate_evt(vs, event, reason);
1495 if (!evt)
1496 return;
1497
1498 if (tpg && lun) {
1499 /* TODO: share lun setup code with virtio-scsi.ko */
1500 /*
1501 * Note: evt->event is zeroed when we allocate it and
1502 * lun[4-7] need to be zero according to virtio-scsi spec.
1503 */
1504 evt->event.lun[0] = 0x01;
1505 evt->event.lun[1] = tpg->tport_tpgt;
1506 if (lun->unpacked_lun >= 256)
1507 evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
1508 evt->event.lun[3] = lun->unpacked_lun & 0xFF;
1509 }
1510
1511 llist_add(&evt->list, &vs->vs_event_list);
1512 vhost_vq_work_queue(vq, &vs->vs_event_work);
1513}
1514
1515static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
1516{
1517 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1518 poll.work);
1519 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1520
1521 mutex_lock(&vq->mutex);
1522 if (!vhost_vq_get_backend(vq))
1523 goto out;
1524
1525 if (vs->vs_events_missed)
1526 vhost_scsi_send_evt(vs, vq, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT,
1527 0);
1528out:
1529 mutex_unlock(&vq->mutex);
1530}
1531
1532static void vhost_scsi_handle_kick(struct vhost_work *work)
1533{
1534 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1535 poll.work);
1536 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1537
1538 vhost_scsi_handle_vq(vs, vq);
1539}
1540
1541/* Callers must hold dev mutex */
1542static void vhost_scsi_flush(struct vhost_scsi *vs)
1543{
1544 int i;
1545
1546 /* Init new inflight and remember the old inflight */
1547 vhost_scsi_init_inflight(vs, vs->old_inflight);
1548
1549 /*
1550 * The inflight->kref was initialized to 1. We decrement it here to
1551 * indicate the start of the flush operation so that it will reach 0
1552 * when all the reqs are finished.
1553 */
1554 for (i = 0; i < vs->dev.nvqs; i++)
1555 kref_put(&vs->old_inflight[i]->kref, vhost_scsi_done_inflight);
1556
1557 /* Flush both the vhost poll and vhost work */
1558 vhost_dev_flush(&vs->dev);
1559
1560 /* Wait for all reqs issued before the flush to be finished */
1561 for (i = 0; i < vs->dev.nvqs; i++)
1562 wait_for_completion(&vs->old_inflight[i]->comp);
1563}
1564
1565static void vhost_scsi_destroy_vq_cmds(struct vhost_virtqueue *vq)
1566{
1567 struct vhost_scsi_virtqueue *svq = container_of(vq,
1568 struct vhost_scsi_virtqueue, vq);
1569 struct vhost_scsi_cmd *tv_cmd;
1570 unsigned int i;
1571
1572 if (!svq->scsi_cmds)
1573 return;
1574
1575 for (i = 0; i < svq->max_cmds; i++) {
1576 tv_cmd = &svq->scsi_cmds[i];
1577
1578 kfree(tv_cmd->tvc_sgl);
1579 kfree(tv_cmd->tvc_prot_sgl);
1580 kfree(tv_cmd->tvc_upages);
1581 kfree(tv_cmd->tvc_resp_iov);
1582 }
1583
1584 sbitmap_free(&svq->scsi_tags);
1585 kfree(svq->scsi_cmds);
1586 svq->scsi_cmds = NULL;
1587}
1588
1589static int vhost_scsi_setup_vq_cmds(struct vhost_virtqueue *vq, int max_cmds)
1590{
1591 struct vhost_scsi_virtqueue *svq = container_of(vq,
1592 struct vhost_scsi_virtqueue, vq);
1593 struct vhost_scsi_cmd *tv_cmd;
1594 unsigned int i;
1595
1596 if (svq->scsi_cmds)
1597 return 0;
1598
1599 if (sbitmap_init_node(&svq->scsi_tags, max_cmds, -1, GFP_KERNEL,
1600 NUMA_NO_NODE, false, true))
1601 return -ENOMEM;
1602 svq->max_cmds = max_cmds;
1603
1604 svq->scsi_cmds = kcalloc(max_cmds, sizeof(*tv_cmd), GFP_KERNEL);
1605 if (!svq->scsi_cmds) {
1606 sbitmap_free(&svq->scsi_tags);
1607 return -ENOMEM;
1608 }
1609
1610 for (i = 0; i < max_cmds; i++) {
1611 tv_cmd = &svq->scsi_cmds[i];
1612
1613 tv_cmd->tvc_sgl = kcalloc(VHOST_SCSI_PREALLOC_SGLS,
1614 sizeof(struct scatterlist),
1615 GFP_KERNEL);
1616 if (!tv_cmd->tvc_sgl) {
1617 pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
1618 goto out;
1619 }
1620
1621 tv_cmd->tvc_upages = kcalloc(VHOST_SCSI_PREALLOC_UPAGES,
1622 sizeof(struct page *),
1623 GFP_KERNEL);
1624 if (!tv_cmd->tvc_upages) {
1625 pr_err("Unable to allocate tv_cmd->tvc_upages\n");
1626 goto out;
1627 }
1628
1629 tv_cmd->tvc_resp_iov = kcalloc(UIO_MAXIOV,
1630 sizeof(struct iovec),
1631 GFP_KERNEL);
1632 if (!tv_cmd->tvc_resp_iov) {
1633 pr_err("Unable to allocate tv_cmd->tvc_resp_iov\n");
1634 goto out;
1635 }
1636
1637 tv_cmd->tvc_prot_sgl = kcalloc(VHOST_SCSI_PREALLOC_PROT_SGLS,
1638 sizeof(struct scatterlist),
1639 GFP_KERNEL);
1640 if (!tv_cmd->tvc_prot_sgl) {
1641 pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
1642 goto out;
1643 }
1644 }
1645 return 0;
1646out:
1647 vhost_scsi_destroy_vq_cmds(vq);
1648 return -ENOMEM;
1649}
1650
1651/*
1652 * Called from vhost_scsi_ioctl() context to walk the list of available
1653 * vhost_scsi_tpg with an active struct vhost_scsi_nexus
1654 *
1655 * The lock nesting rule is:
1656 * vs->dev.mutex -> vhost_scsi_mutex -> tpg->tv_tpg_mutex -> vq->mutex
1657 */
1658static int
1659vhost_scsi_set_endpoint(struct vhost_scsi *vs,
1660 struct vhost_scsi_target *t)
1661{
1662 struct se_portal_group *se_tpg;
1663 struct vhost_scsi_tport *tv_tport;
1664 struct vhost_scsi_tpg *tpg;
1665 struct vhost_scsi_tpg **vs_tpg;
1666 struct vhost_virtqueue *vq;
1667 int index, ret, i, len;
1668 bool match = false;
1669
1670 mutex_lock(&vs->dev.mutex);
1671
1672 /* Verify that ring has been setup correctly. */
1673 for (index = 0; index < vs->dev.nvqs; ++index) {
1674 /* Verify that ring has been setup correctly. */
1675 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1676 ret = -EFAULT;
1677 goto out;
1678 }
1679 }
1680
1681 len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
1682 vs_tpg = kzalloc(len, GFP_KERNEL);
1683 if (!vs_tpg) {
1684 ret = -ENOMEM;
1685 goto out;
1686 }
1687 if (vs->vs_tpg)
1688 memcpy(vs_tpg, vs->vs_tpg, len);
1689
1690 mutex_lock(&vhost_scsi_mutex);
1691 list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) {
1692 mutex_lock(&tpg->tv_tpg_mutex);
1693 if (!tpg->tpg_nexus) {
1694 mutex_unlock(&tpg->tv_tpg_mutex);
1695 continue;
1696 }
1697 if (tpg->tv_tpg_vhost_count != 0) {
1698 mutex_unlock(&tpg->tv_tpg_mutex);
1699 continue;
1700 }
1701 tv_tport = tpg->tport;
1702
1703 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1704 if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
1705 mutex_unlock(&tpg->tv_tpg_mutex);
1706 mutex_unlock(&vhost_scsi_mutex);
1707 ret = -EEXIST;
1708 goto undepend;
1709 }
1710 /*
1711 * In order to ensure individual vhost-scsi configfs
1712 * groups cannot be removed while in use by vhost ioctl,
1713 * go ahead and take an explicit se_tpg->tpg_group.cg_item
1714 * dependency now.
1715 */
1716 se_tpg = &tpg->se_tpg;
1717 ret = target_depend_item(&se_tpg->tpg_group.cg_item);
1718 if (ret) {
1719 pr_warn("target_depend_item() failed: %d\n", ret);
1720 mutex_unlock(&tpg->tv_tpg_mutex);
1721 mutex_unlock(&vhost_scsi_mutex);
1722 goto undepend;
1723 }
1724 tpg->tv_tpg_vhost_count++;
1725 tpg->vhost_scsi = vs;
1726 vs_tpg[tpg->tport_tpgt] = tpg;
1727 match = true;
1728 }
1729 mutex_unlock(&tpg->tv_tpg_mutex);
1730 }
1731 mutex_unlock(&vhost_scsi_mutex);
1732
1733 if (match) {
1734 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1735 sizeof(vs->vs_vhost_wwpn));
1736
1737 for (i = VHOST_SCSI_VQ_IO; i < vs->dev.nvqs; i++) {
1738 vq = &vs->vqs[i].vq;
1739 if (!vhost_vq_is_setup(vq))
1740 continue;
1741
1742 ret = vhost_scsi_setup_vq_cmds(vq, vq->num);
1743 if (ret)
1744 goto destroy_vq_cmds;
1745 }
1746
1747 for (i = 0; i < vs->dev.nvqs; i++) {
1748 vq = &vs->vqs[i].vq;
1749 mutex_lock(&vq->mutex);
1750 vhost_vq_set_backend(vq, vs_tpg);
1751 vhost_vq_init_access(vq);
1752 mutex_unlock(&vq->mutex);
1753 }
1754 ret = 0;
1755 } else {
1756 ret = -EEXIST;
1757 }
1758
1759 /*
1760 * Act as synchronize_rcu to make sure access to
1761 * old vs->vs_tpg is finished.
1762 */
1763 vhost_scsi_flush(vs);
1764 kfree(vs->vs_tpg);
1765 vs->vs_tpg = vs_tpg;
1766 goto out;
1767
1768destroy_vq_cmds:
1769 for (i--; i >= VHOST_SCSI_VQ_IO; i--) {
1770 if (!vhost_vq_get_backend(&vs->vqs[i].vq))
1771 vhost_scsi_destroy_vq_cmds(&vs->vqs[i].vq);
1772 }
1773undepend:
1774 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1775 tpg = vs_tpg[i];
1776 if (tpg) {
1777 mutex_lock(&tpg->tv_tpg_mutex);
1778 tpg->vhost_scsi = NULL;
1779 tpg->tv_tpg_vhost_count--;
1780 mutex_unlock(&tpg->tv_tpg_mutex);
1781 target_undepend_item(&tpg->se_tpg.tpg_group.cg_item);
1782 }
1783 }
1784 kfree(vs_tpg);
1785out:
1786 mutex_unlock(&vs->dev.mutex);
1787 return ret;
1788}
1789
1790static int
1791vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
1792 struct vhost_scsi_target *t)
1793{
1794 struct se_portal_group *se_tpg;
1795 struct vhost_scsi_tport *tv_tport;
1796 struct vhost_scsi_tpg *tpg;
1797 struct vhost_virtqueue *vq;
1798 bool match = false;
1799 int index, ret, i;
1800 u8 target;
1801
1802 mutex_lock(&vs->dev.mutex);
1803 /* Verify that ring has been setup correctly. */
1804 for (index = 0; index < vs->dev.nvqs; ++index) {
1805 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1806 ret = -EFAULT;
1807 goto err_dev;
1808 }
1809 }
1810
1811 if (!vs->vs_tpg) {
1812 ret = 0;
1813 goto err_dev;
1814 }
1815
1816 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1817 target = i;
1818 tpg = vs->vs_tpg[target];
1819 if (!tpg)
1820 continue;
1821
1822 tv_tport = tpg->tport;
1823 if (!tv_tport) {
1824 ret = -ENODEV;
1825 goto err_dev;
1826 }
1827
1828 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1829 pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
1830 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
1831 tv_tport->tport_name, tpg->tport_tpgt,
1832 t->vhost_wwpn, t->vhost_tpgt);
1833 ret = -EINVAL;
1834 goto err_dev;
1835 }
1836 match = true;
1837 }
1838 if (!match)
1839 goto free_vs_tpg;
1840
1841 /* Prevent new cmds from starting and accessing the tpgs/sessions */
1842 for (i = 0; i < vs->dev.nvqs; i++) {
1843 vq = &vs->vqs[i].vq;
1844 mutex_lock(&vq->mutex);
1845 vhost_vq_set_backend(vq, NULL);
1846 mutex_unlock(&vq->mutex);
1847 }
1848 /* Make sure cmds are not running before tearing them down. */
1849 vhost_scsi_flush(vs);
1850
1851 for (i = 0; i < vs->dev.nvqs; i++) {
1852 vq = &vs->vqs[i].vq;
1853 vhost_scsi_destroy_vq_cmds(vq);
1854 }
1855
1856 /*
1857 * We can now release our hold on the tpg and sessions and userspace
1858 * can free them after this point.
1859 */
1860 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1861 target = i;
1862 tpg = vs->vs_tpg[target];
1863 if (!tpg)
1864 continue;
1865
1866 mutex_lock(&tpg->tv_tpg_mutex);
1867
1868 tpg->tv_tpg_vhost_count--;
1869 tpg->vhost_scsi = NULL;
1870 vs->vs_tpg[target] = NULL;
1871
1872 mutex_unlock(&tpg->tv_tpg_mutex);
1873
1874 se_tpg = &tpg->se_tpg;
1875 target_undepend_item(&se_tpg->tpg_group.cg_item);
1876 }
1877
1878free_vs_tpg:
1879 /*
1880 * Act as synchronize_rcu to make sure access to
1881 * old vs->vs_tpg is finished.
1882 */
1883 vhost_scsi_flush(vs);
1884 kfree(vs->vs_tpg);
1885 vs->vs_tpg = NULL;
1886 WARN_ON(vs->vs_events_nr);
1887 mutex_unlock(&vs->dev.mutex);
1888 return 0;
1889
1890err_dev:
1891 mutex_unlock(&vs->dev.mutex);
1892 return ret;
1893}
1894
1895static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1896{
1897 struct vhost_virtqueue *vq;
1898 int i;
1899
1900 if (features & ~VHOST_SCSI_FEATURES)
1901 return -EOPNOTSUPP;
1902
1903 mutex_lock(&vs->dev.mutex);
1904 if ((features & (1 << VHOST_F_LOG_ALL)) &&
1905 !vhost_log_access_ok(&vs->dev)) {
1906 mutex_unlock(&vs->dev.mutex);
1907 return -EFAULT;
1908 }
1909
1910 for (i = 0; i < vs->dev.nvqs; i++) {
1911 vq = &vs->vqs[i].vq;
1912 mutex_lock(&vq->mutex);
1913 vq->acked_features = features;
1914 mutex_unlock(&vq->mutex);
1915 }
1916 mutex_unlock(&vs->dev.mutex);
1917 return 0;
1918}
1919
1920static int vhost_scsi_open(struct inode *inode, struct file *f)
1921{
1922 struct vhost_scsi_virtqueue *svq;
1923 struct vhost_scsi *vs;
1924 struct vhost_virtqueue **vqs;
1925 int r = -ENOMEM, i, nvqs = vhost_scsi_max_io_vqs;
1926
1927 vs = kvzalloc(sizeof(*vs), GFP_KERNEL);
1928 if (!vs)
1929 goto err_vs;
1930
1931 if (nvqs > VHOST_SCSI_MAX_IO_VQ) {
1932 pr_err("Invalid max_io_vqs of %d. Using %d.\n", nvqs,
1933 VHOST_SCSI_MAX_IO_VQ);
1934 nvqs = VHOST_SCSI_MAX_IO_VQ;
1935 } else if (nvqs == 0) {
1936 pr_err("Invalid max_io_vqs of %d. Using 1.\n", nvqs);
1937 nvqs = 1;
1938 }
1939 nvqs += VHOST_SCSI_VQ_IO;
1940
1941 vs->old_inflight = kmalloc_array(nvqs, sizeof(*vs->old_inflight),
1942 GFP_KERNEL | __GFP_ZERO);
1943 if (!vs->old_inflight)
1944 goto err_inflight;
1945
1946 vs->vqs = kmalloc_array(nvqs, sizeof(*vs->vqs),
1947 GFP_KERNEL | __GFP_ZERO);
1948 if (!vs->vqs)
1949 goto err_vqs;
1950
1951 vqs = kmalloc_array(nvqs, sizeof(*vqs), GFP_KERNEL);
1952 if (!vqs)
1953 goto err_local_vqs;
1954
1955 vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);
1956
1957 vs->vs_events_nr = 0;
1958 vs->vs_events_missed = false;
1959
1960 vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
1961 vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1962 vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1963 vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
1964 for (i = VHOST_SCSI_VQ_IO; i < nvqs; i++) {
1965 svq = &vs->vqs[i];
1966
1967 vqs[i] = &svq->vq;
1968 svq->vs = vs;
1969 init_llist_head(&svq->completion_list);
1970 vhost_work_init(&svq->completion_work,
1971 vhost_scsi_complete_cmd_work);
1972 svq->vq.handle_kick = vhost_scsi_handle_kick;
1973 }
1974 vhost_dev_init(&vs->dev, vqs, nvqs, UIO_MAXIOV,
1975 VHOST_SCSI_WEIGHT, 0, true, NULL);
1976
1977 vhost_scsi_init_inflight(vs, NULL);
1978
1979 f->private_data = vs;
1980 return 0;
1981
1982err_local_vqs:
1983 kfree(vs->vqs);
1984err_vqs:
1985 kfree(vs->old_inflight);
1986err_inflight:
1987 kvfree(vs);
1988err_vs:
1989 return r;
1990}
1991
1992static int vhost_scsi_release(struct inode *inode, struct file *f)
1993{
1994 struct vhost_scsi *vs = f->private_data;
1995 struct vhost_scsi_target t;
1996
1997 mutex_lock(&vs->dev.mutex);
1998 memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
1999 mutex_unlock(&vs->dev.mutex);
2000 vhost_scsi_clear_endpoint(vs, &t);
2001 vhost_dev_stop(&vs->dev);
2002 vhost_dev_cleanup(&vs->dev);
2003 kfree(vs->dev.vqs);
2004 kfree(vs->vqs);
2005 kfree(vs->old_inflight);
2006 kvfree(vs);
2007 return 0;
2008}
2009
2010static long
2011vhost_scsi_ioctl(struct file *f,
2012 unsigned int ioctl,
2013 unsigned long arg)
2014{
2015 struct vhost_scsi *vs = f->private_data;
2016 struct vhost_scsi_target backend;
2017 void __user *argp = (void __user *)arg;
2018 u64 __user *featurep = argp;
2019 u32 __user *eventsp = argp;
2020 u32 events_missed;
2021 u64 features;
2022 int r, abi_version = VHOST_SCSI_ABI_VERSION;
2023 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
2024
2025 switch (ioctl) {
2026 case VHOST_SCSI_SET_ENDPOINT:
2027 if (copy_from_user(&backend, argp, sizeof backend))
2028 return -EFAULT;
2029 if (backend.reserved != 0)
2030 return -EOPNOTSUPP;
2031
2032 return vhost_scsi_set_endpoint(vs, &backend);
2033 case VHOST_SCSI_CLEAR_ENDPOINT:
2034 if (copy_from_user(&backend, argp, sizeof backend))
2035 return -EFAULT;
2036 if (backend.reserved != 0)
2037 return -EOPNOTSUPP;
2038
2039 return vhost_scsi_clear_endpoint(vs, &backend);
2040 case VHOST_SCSI_GET_ABI_VERSION:
2041 if (copy_to_user(argp, &abi_version, sizeof abi_version))
2042 return -EFAULT;
2043 return 0;
2044 case VHOST_SCSI_SET_EVENTS_MISSED:
2045 if (get_user(events_missed, eventsp))
2046 return -EFAULT;
2047 mutex_lock(&vq->mutex);
2048 vs->vs_events_missed = events_missed;
2049 mutex_unlock(&vq->mutex);
2050 return 0;
2051 case VHOST_SCSI_GET_EVENTS_MISSED:
2052 mutex_lock(&vq->mutex);
2053 events_missed = vs->vs_events_missed;
2054 mutex_unlock(&vq->mutex);
2055 if (put_user(events_missed, eventsp))
2056 return -EFAULT;
2057 return 0;
2058 case VHOST_GET_FEATURES:
2059 features = VHOST_SCSI_FEATURES;
2060 if (copy_to_user(featurep, &features, sizeof features))
2061 return -EFAULT;
2062 return 0;
2063 case VHOST_SET_FEATURES:
2064 if (copy_from_user(&features, featurep, sizeof features))
2065 return -EFAULT;
2066 return vhost_scsi_set_features(vs, features);
2067 case VHOST_NEW_WORKER:
2068 case VHOST_FREE_WORKER:
2069 case VHOST_ATTACH_VRING_WORKER:
2070 case VHOST_GET_VRING_WORKER:
2071 mutex_lock(&vs->dev.mutex);
2072 r = vhost_worker_ioctl(&vs->dev, ioctl, argp);
2073 mutex_unlock(&vs->dev.mutex);
2074 return r;
2075 default:
2076 mutex_lock(&vs->dev.mutex);
2077 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
2078 /* TODO: flush backend after dev ioctl. */
2079 if (r == -ENOIOCTLCMD)
2080 r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
2081 mutex_unlock(&vs->dev.mutex);
2082 return r;
2083 }
2084}
2085
2086static const struct file_operations vhost_scsi_fops = {
2087 .owner = THIS_MODULE,
2088 .release = vhost_scsi_release,
2089 .unlocked_ioctl = vhost_scsi_ioctl,
2090 .compat_ioctl = compat_ptr_ioctl,
2091 .open = vhost_scsi_open,
2092 .llseek = noop_llseek,
2093};
2094
2095static struct miscdevice vhost_scsi_misc = {
2096 MISC_DYNAMIC_MINOR,
2097 "vhost-scsi",
2098 &vhost_scsi_fops,
2099};
2100
2101static int __init vhost_scsi_register(void)
2102{
2103 return misc_register(&vhost_scsi_misc);
2104}
2105
2106static void vhost_scsi_deregister(void)
2107{
2108 misc_deregister(&vhost_scsi_misc);
2109}
2110
2111static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport)
2112{
2113 switch (tport->tport_proto_id) {
2114 case SCSI_PROTOCOL_SAS:
2115 return "SAS";
2116 case SCSI_PROTOCOL_FCP:
2117 return "FCP";
2118 case SCSI_PROTOCOL_ISCSI:
2119 return "iSCSI";
2120 default:
2121 break;
2122 }
2123
2124 return "Unknown";
2125}
2126
2127static void
2128vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg,
2129 struct se_lun *lun, bool plug)
2130{
2131
2132 struct vhost_scsi *vs = tpg->vhost_scsi;
2133 struct vhost_virtqueue *vq;
2134 u32 reason;
2135
2136 if (!vs)
2137 return;
2138
2139 if (plug)
2140 reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
2141 else
2142 reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
2143
2144 vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
2145 mutex_lock(&vq->mutex);
2146 /*
2147 * We can't queue events if the backend has been cleared, because
2148 * we could end up queueing an event after the flush.
2149 */
2150 if (!vhost_vq_get_backend(vq))
2151 goto unlock;
2152
2153 if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG))
2154 vhost_scsi_send_evt(vs, vq, tpg, lun,
2155 VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
2156unlock:
2157 mutex_unlock(&vq->mutex);
2158}
2159
2160static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
2161{
2162 vhost_scsi_do_plug(tpg, lun, true);
2163}
2164
2165static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
2166{
2167 vhost_scsi_do_plug(tpg, lun, false);
2168}
2169
2170static int vhost_scsi_port_link(struct se_portal_group *se_tpg,
2171 struct se_lun *lun)
2172{
2173 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2174 struct vhost_scsi_tpg, se_tpg);
2175
2176 mutex_lock(&tpg->tv_tpg_mutex);
2177 tpg->tv_tpg_port_count++;
2178 vhost_scsi_hotplug(tpg, lun);
2179 mutex_unlock(&tpg->tv_tpg_mutex);
2180
2181 return 0;
2182}
2183
2184static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
2185 struct se_lun *lun)
2186{
2187 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2188 struct vhost_scsi_tpg, se_tpg);
2189
2190 mutex_lock(&tpg->tv_tpg_mutex);
2191 tpg->tv_tpg_port_count--;
2192 vhost_scsi_hotunplug(tpg, lun);
2193 mutex_unlock(&tpg->tv_tpg_mutex);
2194}
2195
2196static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store(
2197 struct config_item *item, const char *page, size_t count)
2198{
2199 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2200 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2201 struct vhost_scsi_tpg, se_tpg);
2202 unsigned long val;
2203 int ret = kstrtoul(page, 0, &val);
2204
2205 if (ret) {
2206 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
2207 return ret;
2208 }
2209 if (val != 0 && val != 1 && val != 3) {
2210 pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val);
2211 return -EINVAL;
2212 }
2213 tpg->tv_fabric_prot_type = val;
2214
2215 return count;
2216}
2217
2218static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show(
2219 struct config_item *item, char *page)
2220{
2221 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2222 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2223 struct vhost_scsi_tpg, se_tpg);
2224
2225 return sysfs_emit(page, "%d\n", tpg->tv_fabric_prot_type);
2226}
2227
2228CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type);
2229
2230static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = {
2231 &vhost_scsi_tpg_attrib_attr_fabric_prot_type,
2232 NULL,
2233};
2234
2235static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
2236 const char *name)
2237{
2238 struct vhost_scsi_nexus *tv_nexus;
2239
2240 mutex_lock(&tpg->tv_tpg_mutex);
2241 if (tpg->tpg_nexus) {
2242 mutex_unlock(&tpg->tv_tpg_mutex);
2243 pr_debug("tpg->tpg_nexus already exists\n");
2244 return -EEXIST;
2245 }
2246
2247 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
2248 if (!tv_nexus) {
2249 mutex_unlock(&tpg->tv_tpg_mutex);
2250 pr_err("Unable to allocate struct vhost_scsi_nexus\n");
2251 return -ENOMEM;
2252 }
2253 /*
2254 * Since we are running in 'demo mode' this call with generate a
2255 * struct se_node_acl for the vhost_scsi struct se_portal_group with
2256 * the SCSI Initiator port name of the passed configfs group 'name'.
2257 */
2258 tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, 0, 0,
2259 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
2260 (unsigned char *)name, tv_nexus, NULL);
2261 if (IS_ERR(tv_nexus->tvn_se_sess)) {
2262 mutex_unlock(&tpg->tv_tpg_mutex);
2263 kfree(tv_nexus);
2264 return -ENOMEM;
2265 }
2266 tpg->tpg_nexus = tv_nexus;
2267
2268 mutex_unlock(&tpg->tv_tpg_mutex);
2269 return 0;
2270}
2271
2272static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
2273{
2274 struct se_session *se_sess;
2275 struct vhost_scsi_nexus *tv_nexus;
2276
2277 mutex_lock(&tpg->tv_tpg_mutex);
2278 tv_nexus = tpg->tpg_nexus;
2279 if (!tv_nexus) {
2280 mutex_unlock(&tpg->tv_tpg_mutex);
2281 return -ENODEV;
2282 }
2283
2284 se_sess = tv_nexus->tvn_se_sess;
2285 if (!se_sess) {
2286 mutex_unlock(&tpg->tv_tpg_mutex);
2287 return -ENODEV;
2288 }
2289
2290 if (tpg->tv_tpg_port_count != 0) {
2291 mutex_unlock(&tpg->tv_tpg_mutex);
2292 pr_err("Unable to remove TCM_vhost I_T Nexus with"
2293 " active TPG port count: %d\n",
2294 tpg->tv_tpg_port_count);
2295 return -EBUSY;
2296 }
2297
2298 if (tpg->tv_tpg_vhost_count != 0) {
2299 mutex_unlock(&tpg->tv_tpg_mutex);
2300 pr_err("Unable to remove TCM_vhost I_T Nexus with"
2301 " active TPG vhost count: %d\n",
2302 tpg->tv_tpg_vhost_count);
2303 return -EBUSY;
2304 }
2305
2306 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
2307 " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport),
2308 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
2309
2310 /*
2311 * Release the SCSI I_T Nexus to the emulated vhost Target Port
2312 */
2313 target_remove_session(se_sess);
2314 tpg->tpg_nexus = NULL;
2315 mutex_unlock(&tpg->tv_tpg_mutex);
2316
2317 kfree(tv_nexus);
2318 return 0;
2319}
2320
2321static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page)
2322{
2323 struct se_portal_group *se_tpg = to_tpg(item);
2324 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2325 struct vhost_scsi_tpg, se_tpg);
2326 struct vhost_scsi_nexus *tv_nexus;
2327 ssize_t ret;
2328
2329 mutex_lock(&tpg->tv_tpg_mutex);
2330 tv_nexus = tpg->tpg_nexus;
2331 if (!tv_nexus) {
2332 mutex_unlock(&tpg->tv_tpg_mutex);
2333 return -ENODEV;
2334 }
2335 ret = sysfs_emit(page, "%s\n",
2336 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
2337 mutex_unlock(&tpg->tv_tpg_mutex);
2338
2339 return ret;
2340}
2341
2342static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item,
2343 const char *page, size_t count)
2344{
2345 struct se_portal_group *se_tpg = to_tpg(item);
2346 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2347 struct vhost_scsi_tpg, se_tpg);
2348 struct vhost_scsi_tport *tport_wwn = tpg->tport;
2349 unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr;
2350 int ret;
2351 /*
2352 * Shutdown the active I_T nexus if 'NULL' is passed..
2353 */
2354 if (!strncmp(page, "NULL", 4)) {
2355 ret = vhost_scsi_drop_nexus(tpg);
2356 return (!ret) ? count : ret;
2357 }
2358 /*
2359 * Otherwise make sure the passed virtual Initiator port WWN matches
2360 * the fabric protocol_id set in vhost_scsi_make_tport(), and call
2361 * vhost_scsi_make_nexus().
2362 */
2363 if (strlen(page) >= VHOST_SCSI_NAMELEN) {
2364 pr_err("Emulated NAA Sas Address: %s, exceeds"
2365 " max: %d\n", page, VHOST_SCSI_NAMELEN);
2366 return -EINVAL;
2367 }
2368 snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page);
2369
2370 ptr = strstr(i_port, "naa.");
2371 if (ptr) {
2372 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
2373 pr_err("Passed SAS Initiator Port %s does not"
2374 " match target port protoid: %s\n", i_port,
2375 vhost_scsi_dump_proto_id(tport_wwn));
2376 return -EINVAL;
2377 }
2378 port_ptr = &i_port[0];
2379 goto check_newline;
2380 }
2381 ptr = strstr(i_port, "fc.");
2382 if (ptr) {
2383 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
2384 pr_err("Passed FCP Initiator Port %s does not"
2385 " match target port protoid: %s\n", i_port,
2386 vhost_scsi_dump_proto_id(tport_wwn));
2387 return -EINVAL;
2388 }
2389 port_ptr = &i_port[3]; /* Skip over "fc." */
2390 goto check_newline;
2391 }
2392 ptr = strstr(i_port, "iqn.");
2393 if (ptr) {
2394 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
2395 pr_err("Passed iSCSI Initiator Port %s does not"
2396 " match target port protoid: %s\n", i_port,
2397 vhost_scsi_dump_proto_id(tport_wwn));
2398 return -EINVAL;
2399 }
2400 port_ptr = &i_port[0];
2401 goto check_newline;
2402 }
2403 pr_err("Unable to locate prefix for emulated Initiator Port:"
2404 " %s\n", i_port);
2405 return -EINVAL;
2406 /*
2407 * Clear any trailing newline for the NAA WWN
2408 */
2409check_newline:
2410 if (i_port[strlen(i_port)-1] == '\n')
2411 i_port[strlen(i_port)-1] = '\0';
2412
2413 ret = vhost_scsi_make_nexus(tpg, port_ptr);
2414 if (ret < 0)
2415 return ret;
2416
2417 return count;
2418}
2419
2420CONFIGFS_ATTR(vhost_scsi_tpg_, nexus);
2421
2422static struct configfs_attribute *vhost_scsi_tpg_attrs[] = {
2423 &vhost_scsi_tpg_attr_nexus,
2424 NULL,
2425};
2426
2427static struct se_portal_group *
2428vhost_scsi_make_tpg(struct se_wwn *wwn, const char *name)
2429{
2430 struct vhost_scsi_tport *tport = container_of(wwn,
2431 struct vhost_scsi_tport, tport_wwn);
2432
2433 struct vhost_scsi_tpg *tpg;
2434 u16 tpgt;
2435 int ret;
2436
2437 if (strstr(name, "tpgt_") != name)
2438 return ERR_PTR(-EINVAL);
2439 if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET)
2440 return ERR_PTR(-EINVAL);
2441
2442 tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
2443 if (!tpg) {
2444 pr_err("Unable to allocate struct vhost_scsi_tpg");
2445 return ERR_PTR(-ENOMEM);
2446 }
2447 mutex_init(&tpg->tv_tpg_mutex);
2448 INIT_LIST_HEAD(&tpg->tv_tpg_list);
2449 tpg->tport = tport;
2450 tpg->tport_tpgt = tpgt;
2451
2452 ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id);
2453 if (ret < 0) {
2454 kfree(tpg);
2455 return NULL;
2456 }
2457 mutex_lock(&vhost_scsi_mutex);
2458 list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list);
2459 mutex_unlock(&vhost_scsi_mutex);
2460
2461 return &tpg->se_tpg;
2462}
2463
2464static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg)
2465{
2466 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2467 struct vhost_scsi_tpg, se_tpg);
2468
2469 mutex_lock(&vhost_scsi_mutex);
2470 list_del(&tpg->tv_tpg_list);
2471 mutex_unlock(&vhost_scsi_mutex);
2472 /*
2473 * Release the virtual I_T Nexus for this vhost TPG
2474 */
2475 vhost_scsi_drop_nexus(tpg);
2476 /*
2477 * Deregister the se_tpg from TCM..
2478 */
2479 core_tpg_deregister(se_tpg);
2480 kfree(tpg);
2481}
2482
2483static struct se_wwn *
2484vhost_scsi_make_tport(struct target_fabric_configfs *tf,
2485 struct config_group *group,
2486 const char *name)
2487{
2488 struct vhost_scsi_tport *tport;
2489 char *ptr;
2490 u64 wwpn = 0;
2491 int off = 0;
2492
2493 /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
2494 return ERR_PTR(-EINVAL); */
2495
2496 tport = kzalloc(sizeof(*tport), GFP_KERNEL);
2497 if (!tport) {
2498 pr_err("Unable to allocate struct vhost_scsi_tport");
2499 return ERR_PTR(-ENOMEM);
2500 }
2501 tport->tport_wwpn = wwpn;
2502 /*
2503 * Determine the emulated Protocol Identifier and Target Port Name
2504 * based on the incoming configfs directory name.
2505 */
2506 ptr = strstr(name, "naa.");
2507 if (ptr) {
2508 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
2509 goto check_len;
2510 }
2511 ptr = strstr(name, "fc.");
2512 if (ptr) {
2513 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
2514 off = 3; /* Skip over "fc." */
2515 goto check_len;
2516 }
2517 ptr = strstr(name, "iqn.");
2518 if (ptr) {
2519 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
2520 goto check_len;
2521 }
2522
2523 pr_err("Unable to locate prefix for emulated Target Port:"
2524 " %s\n", name);
2525 kfree(tport);
2526 return ERR_PTR(-EINVAL);
2527
2528check_len:
2529 if (strlen(name) >= VHOST_SCSI_NAMELEN) {
2530 pr_err("Emulated %s Address: %s, exceeds"
2531 " max: %d\n", name, vhost_scsi_dump_proto_id(tport),
2532 VHOST_SCSI_NAMELEN);
2533 kfree(tport);
2534 return ERR_PTR(-EINVAL);
2535 }
2536 snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]);
2537
2538 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
2539 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name);
2540
2541 return &tport->tport_wwn;
2542}
2543
2544static void vhost_scsi_drop_tport(struct se_wwn *wwn)
2545{
2546 struct vhost_scsi_tport *tport = container_of(wwn,
2547 struct vhost_scsi_tport, tport_wwn);
2548
2549 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
2550 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport),
2551 tport->tport_name);
2552
2553 kfree(tport);
2554}
2555
2556static ssize_t
2557vhost_scsi_wwn_version_show(struct config_item *item, char *page)
2558{
2559 return sysfs_emit(page, "TCM_VHOST fabric module %s on %s/%s"
2560 "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2561 utsname()->machine);
2562}
2563
2564CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version);
2565
2566static struct configfs_attribute *vhost_scsi_wwn_attrs[] = {
2567 &vhost_scsi_wwn_attr_version,
2568 NULL,
2569};
2570
2571static const struct target_core_fabric_ops vhost_scsi_ops = {
2572 .module = THIS_MODULE,
2573 .fabric_name = "vhost",
2574 .max_data_sg_nents = VHOST_SCSI_PREALLOC_SGLS,
2575 .tpg_get_wwn = vhost_scsi_get_fabric_wwn,
2576 .tpg_get_tag = vhost_scsi_get_tpgt,
2577 .tpg_check_demo_mode = vhost_scsi_check_true,
2578 .tpg_check_demo_mode_cache = vhost_scsi_check_true,
2579 .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only,
2580 .release_cmd = vhost_scsi_release_cmd,
2581 .check_stop_free = vhost_scsi_check_stop_free,
2582 .sess_get_initiator_sid = NULL,
2583 .write_pending = vhost_scsi_write_pending,
2584 .queue_data_in = vhost_scsi_queue_data_in,
2585 .queue_status = vhost_scsi_queue_status,
2586 .queue_tm_rsp = vhost_scsi_queue_tm_rsp,
2587 .aborted_task = vhost_scsi_aborted_task,
2588 /*
2589 * Setup callers for generic logic in target_core_fabric_configfs.c
2590 */
2591 .fabric_make_wwn = vhost_scsi_make_tport,
2592 .fabric_drop_wwn = vhost_scsi_drop_tport,
2593 .fabric_make_tpg = vhost_scsi_make_tpg,
2594 .fabric_drop_tpg = vhost_scsi_drop_tpg,
2595 .fabric_post_link = vhost_scsi_port_link,
2596 .fabric_pre_unlink = vhost_scsi_port_unlink,
2597
2598 .tfc_wwn_attrs = vhost_scsi_wwn_attrs,
2599 .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs,
2600 .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs,
2601
2602 .default_submit_type = TARGET_QUEUE_SUBMIT,
2603 .direct_submit_supp = 1,
2604};
2605
2606static int __init vhost_scsi_init(void)
2607{
2608 int ret = -ENOMEM;
2609
2610 pr_debug("TCM_VHOST fabric module %s on %s/%s"
2611 " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2612 utsname()->machine);
2613
2614 ret = vhost_scsi_register();
2615 if (ret < 0)
2616 goto out;
2617
2618 ret = target_register_template(&vhost_scsi_ops);
2619 if (ret < 0)
2620 goto out_vhost_scsi_deregister;
2621
2622 return 0;
2623
2624out_vhost_scsi_deregister:
2625 vhost_scsi_deregister();
2626out:
2627 return ret;
2628};
2629
2630static void vhost_scsi_exit(void)
2631{
2632 target_unregister_template(&vhost_scsi_ops);
2633 vhost_scsi_deregister();
2634};
2635
2636MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2637MODULE_ALIAS("tcm_vhost");
2638MODULE_LICENSE("GPL");
2639module_init(vhost_scsi_init);
2640module_exit(vhost_scsi_exit);