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1/*******************************************************************************
2 * Vhost kernel TCM fabric driver for virtio SCSI initiators
3 *
4 * (C) Copyright 2010-2013 Datera, Inc.
5 * (C) Copyright 2010-2012 IBM Corp.
6 *
7 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
8 *
9 * Authors: Nicholas A. Bellinger <nab@daterainc.com>
10 * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
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#include <linux/percpu_ida.h>
50
51#include "vhost.h"
52
53#define VHOST_SCSI_VERSION "v0.1"
54#define VHOST_SCSI_NAMELEN 256
55#define VHOST_SCSI_MAX_CDB_SIZE 32
56#define VHOST_SCSI_DEFAULT_TAGS 256
57#define VHOST_SCSI_PREALLOC_SGLS 2048
58#define VHOST_SCSI_PREALLOC_UPAGES 2048
59#define VHOST_SCSI_PREALLOC_PROT_SGLS 512
60
61struct vhost_scsi_inflight {
62 /* Wait for the flush operation to finish */
63 struct completion comp;
64 /* Refcount for the inflight reqs */
65 struct kref kref;
66};
67
68struct vhost_scsi_cmd {
69 /* Descriptor from vhost_get_vq_desc() for virt_queue segment */
70 int tvc_vq_desc;
71 /* virtio-scsi initiator task attribute */
72 int tvc_task_attr;
73 /* virtio-scsi response incoming iovecs */
74 int tvc_in_iovs;
75 /* virtio-scsi initiator data direction */
76 enum dma_data_direction tvc_data_direction;
77 /* Expected data transfer length from virtio-scsi header */
78 u32 tvc_exp_data_len;
79 /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
80 u64 tvc_tag;
81 /* The number of scatterlists associated with this cmd */
82 u32 tvc_sgl_count;
83 u32 tvc_prot_sgl_count;
84 /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */
85 u32 tvc_lun;
86 /* Pointer to the SGL formatted memory from virtio-scsi */
87 struct scatterlist *tvc_sgl;
88 struct scatterlist *tvc_prot_sgl;
89 struct page **tvc_upages;
90 /* Pointer to response header iovec */
91 struct iovec *tvc_resp_iov;
92 /* Pointer to vhost_scsi for our device */
93 struct vhost_scsi *tvc_vhost;
94 /* Pointer to vhost_virtqueue for the cmd */
95 struct vhost_virtqueue *tvc_vq;
96 /* Pointer to vhost nexus memory */
97 struct vhost_scsi_nexus *tvc_nexus;
98 /* The TCM I/O descriptor that is accessed via container_of() */
99 struct se_cmd tvc_se_cmd;
100 /* work item used for cmwq dispatch to vhost_scsi_submission_work() */
101 struct work_struct work;
102 /* Copy of the incoming SCSI command descriptor block (CDB) */
103 unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE];
104 /* Sense buffer that will be mapped into outgoing status */
105 unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
106 /* Completed commands list, serviced from vhost worker thread */
107 struct llist_node tvc_completion_list;
108 /* Used to track inflight cmd */
109 struct vhost_scsi_inflight *inflight;
110};
111
112struct vhost_scsi_nexus {
113 /* Pointer to TCM session for I_T Nexus */
114 struct se_session *tvn_se_sess;
115};
116
117struct vhost_scsi_tpg {
118 /* Vhost port target portal group tag for TCM */
119 u16 tport_tpgt;
120 /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
121 int tv_tpg_port_count;
122 /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
123 int tv_tpg_vhost_count;
124 /* Used for enabling T10-PI with legacy devices */
125 int tv_fabric_prot_type;
126 /* list for vhost_scsi_list */
127 struct list_head tv_tpg_list;
128 /* Used to protect access for tpg_nexus */
129 struct mutex tv_tpg_mutex;
130 /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
131 struct vhost_scsi_nexus *tpg_nexus;
132 /* Pointer back to vhost_scsi_tport */
133 struct vhost_scsi_tport *tport;
134 /* Returned by vhost_scsi_make_tpg() */
135 struct se_portal_group se_tpg;
136 /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */
137 struct vhost_scsi *vhost_scsi;
138};
139
140struct vhost_scsi_tport {
141 /* SCSI protocol the tport is providing */
142 u8 tport_proto_id;
143 /* Binary World Wide unique Port Name for Vhost Target port */
144 u64 tport_wwpn;
145 /* ASCII formatted WWPN for Vhost Target port */
146 char tport_name[VHOST_SCSI_NAMELEN];
147 /* Returned by vhost_scsi_make_tport() */
148 struct se_wwn tport_wwn;
149};
150
151struct vhost_scsi_evt {
152 /* event to be sent to guest */
153 struct virtio_scsi_event event;
154 /* event list, serviced from vhost worker thread */
155 struct llist_node list;
156};
157
158enum {
159 VHOST_SCSI_VQ_CTL = 0,
160 VHOST_SCSI_VQ_EVT = 1,
161 VHOST_SCSI_VQ_IO = 2,
162};
163
164/* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */
165enum {
166 VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
167 (1ULL << VIRTIO_SCSI_F_T10_PI)
168};
169
170#define VHOST_SCSI_MAX_TARGET 256
171#define VHOST_SCSI_MAX_VQ 128
172#define VHOST_SCSI_MAX_EVENT 128
173
174struct vhost_scsi_virtqueue {
175 struct vhost_virtqueue vq;
176 /*
177 * 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};
188
189struct vhost_scsi {
190 /* Protected by vhost_scsi->dev.mutex */
191 struct vhost_scsi_tpg **vs_tpg;
192 char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
193
194 struct vhost_dev dev;
195 struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ];
196
197 struct vhost_work vs_completion_work; /* cmd completion work item */
198 struct llist_head vs_completion_list; /* cmd completion queue */
199
200 struct vhost_work vs_event_work; /* evt injection work item */
201 struct llist_head vs_event_list; /* evt injection queue */
202
203 bool vs_events_missed; /* any missed events, protected by vq->mutex */
204 int vs_events_nr; /* num of pending events, protected by vq->mutex */
205};
206
207static struct workqueue_struct *vhost_scsi_workqueue;
208
209/* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */
210static DEFINE_MUTEX(vhost_scsi_mutex);
211static LIST_HEAD(vhost_scsi_list);
212
213static int iov_num_pages(void __user *iov_base, size_t iov_len)
214{
215 return (PAGE_ALIGN((unsigned long)iov_base + iov_len) -
216 ((unsigned long)iov_base & PAGE_MASK)) >> PAGE_SHIFT;
217}
218
219static void vhost_scsi_done_inflight(struct kref *kref)
220{
221 struct vhost_scsi_inflight *inflight;
222
223 inflight = container_of(kref, struct vhost_scsi_inflight, kref);
224 complete(&inflight->comp);
225}
226
227static void vhost_scsi_init_inflight(struct vhost_scsi *vs,
228 struct vhost_scsi_inflight *old_inflight[])
229{
230 struct vhost_scsi_inflight *new_inflight;
231 struct vhost_virtqueue *vq;
232 int idx, i;
233
234 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
235 vq = &vs->vqs[i].vq;
236
237 mutex_lock(&vq->mutex);
238
239 /* store old infight */
240 idx = vs->vqs[i].inflight_idx;
241 if (old_inflight)
242 old_inflight[i] = &vs->vqs[i].inflights[idx];
243
244 /* setup new infight */
245 vs->vqs[i].inflight_idx = idx ^ 1;
246 new_inflight = &vs->vqs[i].inflights[idx ^ 1];
247 kref_init(&new_inflight->kref);
248 init_completion(&new_inflight->comp);
249
250 mutex_unlock(&vq->mutex);
251 }
252}
253
254static struct vhost_scsi_inflight *
255vhost_scsi_get_inflight(struct vhost_virtqueue *vq)
256{
257 struct vhost_scsi_inflight *inflight;
258 struct vhost_scsi_virtqueue *svq;
259
260 svq = container_of(vq, struct vhost_scsi_virtqueue, vq);
261 inflight = &svq->inflights[svq->inflight_idx];
262 kref_get(&inflight->kref);
263
264 return inflight;
265}
266
267static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight)
268{
269 kref_put(&inflight->kref, vhost_scsi_done_inflight);
270}
271
272static int vhost_scsi_check_true(struct se_portal_group *se_tpg)
273{
274 return 1;
275}
276
277static int vhost_scsi_check_false(struct se_portal_group *se_tpg)
278{
279 return 0;
280}
281
282static char *vhost_scsi_get_fabric_name(void)
283{
284 return "vhost";
285}
286
287static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg)
288{
289 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
290 struct vhost_scsi_tpg, se_tpg);
291 struct vhost_scsi_tport *tport = tpg->tport;
292
293 return &tport->tport_name[0];
294}
295
296static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg)
297{
298 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
299 struct vhost_scsi_tpg, se_tpg);
300 return tpg->tport_tpgt;
301}
302
303static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg)
304{
305 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
306 struct vhost_scsi_tpg, se_tpg);
307
308 return tpg->tv_fabric_prot_type;
309}
310
311static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg)
312{
313 return 1;
314}
315
316static void vhost_scsi_release_cmd(struct se_cmd *se_cmd)
317{
318 struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd,
319 struct vhost_scsi_cmd, tvc_se_cmd);
320 struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess;
321 int i;
322
323 if (tv_cmd->tvc_sgl_count) {
324 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
325 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
326 }
327 if (tv_cmd->tvc_prot_sgl_count) {
328 for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++)
329 put_page(sg_page(&tv_cmd->tvc_prot_sgl[i]));
330 }
331
332 vhost_scsi_put_inflight(tv_cmd->inflight);
333 percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag);
334}
335
336static int vhost_scsi_shutdown_session(struct se_session *se_sess)
337{
338 return 0;
339}
340
341static void vhost_scsi_close_session(struct se_session *se_sess)
342{
343 return;
344}
345
346static u32 vhost_scsi_sess_get_index(struct se_session *se_sess)
347{
348 return 0;
349}
350
351static int vhost_scsi_write_pending(struct se_cmd *se_cmd)
352{
353 /* Go ahead and process the write immediately */
354 target_execute_cmd(se_cmd);
355 return 0;
356}
357
358static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd)
359{
360 return 0;
361}
362
363static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl)
364{
365 return;
366}
367
368static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd)
369{
370 return 0;
371}
372
373static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd)
374{
375 struct vhost_scsi *vs = cmd->tvc_vhost;
376
377 llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);
378
379 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
380}
381
382static int vhost_scsi_queue_data_in(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
390static int vhost_scsi_queue_status(struct se_cmd *se_cmd)
391{
392 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
393 struct vhost_scsi_cmd, tvc_se_cmd);
394 vhost_scsi_complete_cmd(cmd);
395 return 0;
396}
397
398static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd)
399{
400 return;
401}
402
403static void vhost_scsi_aborted_task(struct se_cmd *se_cmd)
404{
405 return;
406}
407
408static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
409{
410 vs->vs_events_nr--;
411 kfree(evt);
412}
413
414static struct vhost_scsi_evt *
415vhost_scsi_allocate_evt(struct vhost_scsi *vs,
416 u32 event, u32 reason)
417{
418 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
419 struct vhost_scsi_evt *evt;
420
421 if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
422 vs->vs_events_missed = true;
423 return NULL;
424 }
425
426 evt = kzalloc(sizeof(*evt), GFP_KERNEL);
427 if (!evt) {
428 vq_err(vq, "Failed to allocate vhost_scsi_evt\n");
429 vs->vs_events_missed = true;
430 return NULL;
431 }
432
433 evt->event.event = cpu_to_vhost32(vq, event);
434 evt->event.reason = cpu_to_vhost32(vq, reason);
435 vs->vs_events_nr++;
436
437 return evt;
438}
439
440static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd)
441{
442 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
443
444 /* TODO locking against target/backend threads? */
445 transport_generic_free_cmd(se_cmd, 0);
446
447}
448
449static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
450{
451 return target_put_sess_cmd(se_cmd);
452}
453
454static void
455vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
456{
457 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
458 struct virtio_scsi_event *event = &evt->event;
459 struct virtio_scsi_event __user *eventp;
460 unsigned out, in;
461 int head, ret;
462
463 if (!vq->private_data) {
464 vs->vs_events_missed = true;
465 return;
466 }
467
468again:
469 vhost_disable_notify(&vs->dev, vq);
470 head = vhost_get_vq_desc(vq, vq->iov,
471 ARRAY_SIZE(vq->iov), &out, &in,
472 NULL, NULL);
473 if (head < 0) {
474 vs->vs_events_missed = true;
475 return;
476 }
477 if (head == vq->num) {
478 if (vhost_enable_notify(&vs->dev, vq))
479 goto again;
480 vs->vs_events_missed = true;
481 return;
482 }
483
484 if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
485 vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
486 vq->iov[out].iov_len);
487 vs->vs_events_missed = true;
488 return;
489 }
490
491 if (vs->vs_events_missed) {
492 event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED);
493 vs->vs_events_missed = false;
494 }
495
496 eventp = vq->iov[out].iov_base;
497 ret = __copy_to_user(eventp, event, sizeof(*event));
498 if (!ret)
499 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
500 else
501 vq_err(vq, "Faulted on vhost_scsi_send_event\n");
502}
503
504static void vhost_scsi_evt_work(struct vhost_work *work)
505{
506 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
507 vs_event_work);
508 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
509 struct vhost_scsi_evt *evt;
510 struct llist_node *llnode;
511
512 mutex_lock(&vq->mutex);
513 llnode = llist_del_all(&vs->vs_event_list);
514 while (llnode) {
515 evt = llist_entry(llnode, struct vhost_scsi_evt, list);
516 llnode = llist_next(llnode);
517 vhost_scsi_do_evt_work(vs, evt);
518 vhost_scsi_free_evt(vs, evt);
519 }
520 mutex_unlock(&vq->mutex);
521}
522
523/* Fill in status and signal that we are done processing this command
524 *
525 * This is scheduled in the vhost work queue so we are called with the owner
526 * process mm and can access the vring.
527 */
528static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
529{
530 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
531 vs_completion_work);
532 DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
533 struct virtio_scsi_cmd_resp v_rsp;
534 struct vhost_scsi_cmd *cmd;
535 struct llist_node *llnode;
536 struct se_cmd *se_cmd;
537 struct iov_iter iov_iter;
538 int ret, vq;
539
540 bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
541 llnode = llist_del_all(&vs->vs_completion_list);
542 while (llnode) {
543 cmd = llist_entry(llnode, struct vhost_scsi_cmd,
544 tvc_completion_list);
545 llnode = llist_next(llnode);
546 se_cmd = &cmd->tvc_se_cmd;
547
548 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
549 cmd, se_cmd->residual_count, se_cmd->scsi_status);
550
551 memset(&v_rsp, 0, sizeof(v_rsp));
552 v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count);
553 /* TODO is status_qualifier field needed? */
554 v_rsp.status = se_cmd->scsi_status;
555 v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq,
556 se_cmd->scsi_sense_length);
557 memcpy(v_rsp.sense, cmd->tvc_sense_buf,
558 se_cmd->scsi_sense_length);
559
560 iov_iter_init(&iov_iter, READ, cmd->tvc_resp_iov,
561 cmd->tvc_in_iovs, sizeof(v_rsp));
562 ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter);
563 if (likely(ret == sizeof(v_rsp))) {
564 struct vhost_scsi_virtqueue *q;
565 vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
566 q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
567 vq = q - vs->vqs;
568 __set_bit(vq, signal);
569 } else
570 pr_err("Faulted on virtio_scsi_cmd_resp\n");
571
572 vhost_scsi_free_cmd(cmd);
573 }
574
575 vq = -1;
576 while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
577 < VHOST_SCSI_MAX_VQ)
578 vhost_signal(&vs->dev, &vs->vqs[vq].vq);
579}
580
581static struct vhost_scsi_cmd *
582vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg,
583 unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
584 u32 exp_data_len, int data_direction)
585{
586 struct vhost_scsi_cmd *cmd;
587 struct vhost_scsi_nexus *tv_nexus;
588 struct se_session *se_sess;
589 struct scatterlist *sg, *prot_sg;
590 struct page **pages;
591 int tag;
592
593 tv_nexus = tpg->tpg_nexus;
594 if (!tv_nexus) {
595 pr_err("Unable to locate active struct vhost_scsi_nexus\n");
596 return ERR_PTR(-EIO);
597 }
598 se_sess = tv_nexus->tvn_se_sess;
599
600 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING);
601 if (tag < 0) {
602 pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
603 return ERR_PTR(-ENOMEM);
604 }
605
606 cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag];
607 sg = cmd->tvc_sgl;
608 prot_sg = cmd->tvc_prot_sgl;
609 pages = cmd->tvc_upages;
610 memset(cmd, 0, sizeof(struct vhost_scsi_cmd));
611
612 cmd->tvc_sgl = sg;
613 cmd->tvc_prot_sgl = prot_sg;
614 cmd->tvc_upages = pages;
615 cmd->tvc_se_cmd.map_tag = tag;
616 cmd->tvc_tag = scsi_tag;
617 cmd->tvc_lun = lun;
618 cmd->tvc_task_attr = task_attr;
619 cmd->tvc_exp_data_len = exp_data_len;
620 cmd->tvc_data_direction = data_direction;
621 cmd->tvc_nexus = tv_nexus;
622 cmd->inflight = vhost_scsi_get_inflight(vq);
623
624 memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE);
625
626 return cmd;
627}
628
629/*
630 * Map a user memory range into a scatterlist
631 *
632 * Returns the number of scatterlist entries used or -errno on error.
633 */
634static int
635vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd,
636 void __user *ptr,
637 size_t len,
638 struct scatterlist *sgl,
639 bool write)
640{
641 unsigned int npages = 0, offset, nbytes;
642 unsigned int pages_nr = iov_num_pages(ptr, len);
643 struct scatterlist *sg = sgl;
644 struct page **pages = cmd->tvc_upages;
645 int ret, i;
646
647 if (pages_nr > VHOST_SCSI_PREALLOC_UPAGES) {
648 pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
649 " preallocated VHOST_SCSI_PREALLOC_UPAGES: %u\n",
650 pages_nr, VHOST_SCSI_PREALLOC_UPAGES);
651 return -ENOBUFS;
652 }
653
654 ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
655 /* No pages were pinned */
656 if (ret < 0)
657 goto out;
658 /* Less pages pinned than wanted */
659 if (ret != pages_nr) {
660 for (i = 0; i < ret; i++)
661 put_page(pages[i]);
662 ret = -EFAULT;
663 goto out;
664 }
665
666 while (len > 0) {
667 offset = (uintptr_t)ptr & ~PAGE_MASK;
668 nbytes = min_t(unsigned int, PAGE_SIZE - offset, len);
669 sg_set_page(sg, pages[npages], nbytes, offset);
670 ptr += nbytes;
671 len -= nbytes;
672 sg++;
673 npages++;
674 }
675
676out:
677 return ret;
678}
679
680static int
681vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls)
682{
683 int sgl_count = 0;
684
685 if (!iter || !iter->iov) {
686 pr_err("%s: iter->iov is NULL, but expected bytes: %zu"
687 " present\n", __func__, bytes);
688 return -EINVAL;
689 }
690
691 sgl_count = iov_iter_npages(iter, 0xffff);
692 if (sgl_count > max_sgls) {
693 pr_err("%s: requested sgl_count: %d exceeds pre-allocated"
694 " max_sgls: %d\n", __func__, sgl_count, max_sgls);
695 return -EINVAL;
696 }
697 return sgl_count;
698}
699
700static int
701vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write,
702 struct iov_iter *iter,
703 struct scatterlist *sg, int sg_count)
704{
705 size_t off = iter->iov_offset;
706 int i, ret;
707
708 for (i = 0; i < iter->nr_segs; i++) {
709 void __user *base = iter->iov[i].iov_base + off;
710 size_t len = iter->iov[i].iov_len - off;
711
712 ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write);
713 if (ret < 0) {
714 for (i = 0; i < sg_count; i++) {
715 struct page *page = sg_page(&sg[i]);
716 if (page)
717 put_page(page);
718 }
719 return ret;
720 }
721 sg += ret;
722 off = 0;
723 }
724 return 0;
725}
726
727static int
728vhost_scsi_mapal(struct vhost_scsi_cmd *cmd,
729 size_t prot_bytes, struct iov_iter *prot_iter,
730 size_t data_bytes, struct iov_iter *data_iter)
731{
732 int sgl_count, ret;
733 bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE);
734
735 if (prot_bytes) {
736 sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes,
737 VHOST_SCSI_PREALLOC_PROT_SGLS);
738 if (sgl_count < 0)
739 return sgl_count;
740
741 sg_init_table(cmd->tvc_prot_sgl, sgl_count);
742 cmd->tvc_prot_sgl_count = sgl_count;
743 pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
744 cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count);
745
746 ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter,
747 cmd->tvc_prot_sgl,
748 cmd->tvc_prot_sgl_count);
749 if (ret < 0) {
750 cmd->tvc_prot_sgl_count = 0;
751 return ret;
752 }
753 }
754 sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes,
755 VHOST_SCSI_PREALLOC_SGLS);
756 if (sgl_count < 0)
757 return sgl_count;
758
759 sg_init_table(cmd->tvc_sgl, sgl_count);
760 cmd->tvc_sgl_count = sgl_count;
761 pr_debug("%s data_sg %p data_sgl_count %u\n", __func__,
762 cmd->tvc_sgl, cmd->tvc_sgl_count);
763
764 ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter,
765 cmd->tvc_sgl, cmd->tvc_sgl_count);
766 if (ret < 0) {
767 cmd->tvc_sgl_count = 0;
768 return ret;
769 }
770 return 0;
771}
772
773static int vhost_scsi_to_tcm_attr(int attr)
774{
775 switch (attr) {
776 case VIRTIO_SCSI_S_SIMPLE:
777 return TCM_SIMPLE_TAG;
778 case VIRTIO_SCSI_S_ORDERED:
779 return TCM_ORDERED_TAG;
780 case VIRTIO_SCSI_S_HEAD:
781 return TCM_HEAD_TAG;
782 case VIRTIO_SCSI_S_ACA:
783 return TCM_ACA_TAG;
784 default:
785 break;
786 }
787 return TCM_SIMPLE_TAG;
788}
789
790static void vhost_scsi_submission_work(struct work_struct *work)
791{
792 struct vhost_scsi_cmd *cmd =
793 container_of(work, struct vhost_scsi_cmd, work);
794 struct vhost_scsi_nexus *tv_nexus;
795 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
796 struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
797 int rc;
798
799 /* FIXME: BIDI operation */
800 if (cmd->tvc_sgl_count) {
801 sg_ptr = cmd->tvc_sgl;
802
803 if (cmd->tvc_prot_sgl_count)
804 sg_prot_ptr = cmd->tvc_prot_sgl;
805 else
806 se_cmd->prot_pto = true;
807 } else {
808 sg_ptr = NULL;
809 }
810 tv_nexus = cmd->tvc_nexus;
811
812 se_cmd->tag = 0;
813 rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
814 cmd->tvc_cdb, &cmd->tvc_sense_buf[0],
815 cmd->tvc_lun, cmd->tvc_exp_data_len,
816 vhost_scsi_to_tcm_attr(cmd->tvc_task_attr),
817 cmd->tvc_data_direction, TARGET_SCF_ACK_KREF,
818 sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr,
819 cmd->tvc_prot_sgl_count);
820 if (rc < 0) {
821 transport_send_check_condition_and_sense(se_cmd,
822 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
823 transport_generic_free_cmd(se_cmd, 0);
824 }
825}
826
827static void
828vhost_scsi_send_bad_target(struct vhost_scsi *vs,
829 struct vhost_virtqueue *vq,
830 int head, unsigned out)
831{
832 struct virtio_scsi_cmd_resp __user *resp;
833 struct virtio_scsi_cmd_resp rsp;
834 int ret;
835
836 memset(&rsp, 0, sizeof(rsp));
837 rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
838 resp = vq->iov[out].iov_base;
839 ret = __copy_to_user(resp, &rsp, sizeof(rsp));
840 if (!ret)
841 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
842 else
843 pr_err("Faulted on virtio_scsi_cmd_resp\n");
844}
845
846static void
847vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
848{
849 struct vhost_scsi_tpg **vs_tpg, *tpg;
850 struct virtio_scsi_cmd_req v_req;
851 struct virtio_scsi_cmd_req_pi v_req_pi;
852 struct vhost_scsi_cmd *cmd;
853 struct iov_iter out_iter, in_iter, prot_iter, data_iter;
854 u64 tag;
855 u32 exp_data_len, data_direction;
856 unsigned out, in;
857 int head, ret, prot_bytes;
858 size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp);
859 size_t out_size, in_size;
860 u16 lun;
861 u8 *target, *lunp, task_attr;
862 bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI);
863 void *req, *cdb;
864
865 mutex_lock(&vq->mutex);
866 /*
867 * We can handle the vq only after the endpoint is setup by calling the
868 * VHOST_SCSI_SET_ENDPOINT ioctl.
869 */
870 vs_tpg = vq->private_data;
871 if (!vs_tpg)
872 goto out;
873
874 vhost_disable_notify(&vs->dev, vq);
875
876 for (;;) {
877 head = vhost_get_vq_desc(vq, vq->iov,
878 ARRAY_SIZE(vq->iov), &out, &in,
879 NULL, NULL);
880 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
881 head, out, in);
882 /* On error, stop handling until the next kick. */
883 if (unlikely(head < 0))
884 break;
885 /* Nothing new? Wait for eventfd to tell us they refilled. */
886 if (head == vq->num) {
887 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
888 vhost_disable_notify(&vs->dev, vq);
889 continue;
890 }
891 break;
892 }
893 /*
894 * Check for a sane response buffer so we can report early
895 * errors back to the guest.
896 */
897 if (unlikely(vq->iov[out].iov_len < rsp_size)) {
898 vq_err(vq, "Expecting at least virtio_scsi_cmd_resp"
899 " size, got %zu bytes\n", vq->iov[out].iov_len);
900 break;
901 }
902 /*
903 * Setup pointers and values based upon different virtio-scsi
904 * request header if T10_PI is enabled in KVM guest.
905 */
906 if (t10_pi) {
907 req = &v_req_pi;
908 req_size = sizeof(v_req_pi);
909 lunp = &v_req_pi.lun[0];
910 target = &v_req_pi.lun[1];
911 } else {
912 req = &v_req;
913 req_size = sizeof(v_req);
914 lunp = &v_req.lun[0];
915 target = &v_req.lun[1];
916 }
917 /*
918 * FIXME: Not correct for BIDI operation
919 */
920 out_size = iov_length(vq->iov, out);
921 in_size = iov_length(&vq->iov[out], in);
922
923 /*
924 * Copy over the virtio-scsi request header, which for a
925 * ANY_LAYOUT enabled guest may span multiple iovecs, or a
926 * single iovec may contain both the header + outgoing
927 * WRITE payloads.
928 *
929 * copy_from_iter() will advance out_iter, so that it will
930 * point at the start of the outgoing WRITE payload, if
931 * DMA_TO_DEVICE is set.
932 */
933 iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size);
934
935 ret = copy_from_iter(req, req_size, &out_iter);
936 if (unlikely(ret != req_size)) {
937 vq_err(vq, "Faulted on copy_from_iter\n");
938 vhost_scsi_send_bad_target(vs, vq, head, out);
939 continue;
940 }
941 /* virtio-scsi spec requires byte 0 of the lun to be 1 */
942 if (unlikely(*lunp != 1)) {
943 vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp);
944 vhost_scsi_send_bad_target(vs, vq, head, out);
945 continue;
946 }
947
948 tpg = ACCESS_ONCE(vs_tpg[*target]);
949 if (unlikely(!tpg)) {
950 /* Target does not exist, fail the request */
951 vhost_scsi_send_bad_target(vs, vq, head, out);
952 continue;
953 }
954 /*
955 * Determine data_direction by calculating the total outgoing
956 * iovec sizes + incoming iovec sizes vs. virtio-scsi request +
957 * response headers respectively.
958 *
959 * For DMA_TO_DEVICE this is out_iter, which is already pointing
960 * to the right place.
961 *
962 * For DMA_FROM_DEVICE, the iovec will be just past the end
963 * of the virtio-scsi response header in either the same
964 * or immediately following iovec.
965 *
966 * Any associated T10_PI bytes for the outgoing / incoming
967 * payloads are included in calculation of exp_data_len here.
968 */
969 prot_bytes = 0;
970
971 if (out_size > req_size) {
972 data_direction = DMA_TO_DEVICE;
973 exp_data_len = out_size - req_size;
974 data_iter = out_iter;
975 } else if (in_size > rsp_size) {
976 data_direction = DMA_FROM_DEVICE;
977 exp_data_len = in_size - rsp_size;
978
979 iov_iter_init(&in_iter, READ, &vq->iov[out], in,
980 rsp_size + exp_data_len);
981 iov_iter_advance(&in_iter, rsp_size);
982 data_iter = in_iter;
983 } else {
984 data_direction = DMA_NONE;
985 exp_data_len = 0;
986 }
987 /*
988 * If T10_PI header + payload is present, setup prot_iter values
989 * and recalculate data_iter for vhost_scsi_mapal() mapping to
990 * host scatterlists via get_user_pages_fast().
991 */
992 if (t10_pi) {
993 if (v_req_pi.pi_bytesout) {
994 if (data_direction != DMA_TO_DEVICE) {
995 vq_err(vq, "Received non zero pi_bytesout,"
996 " but wrong data_direction\n");
997 vhost_scsi_send_bad_target(vs, vq, head, out);
998 continue;
999 }
1000 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout);
1001 } else if (v_req_pi.pi_bytesin) {
1002 if (data_direction != DMA_FROM_DEVICE) {
1003 vq_err(vq, "Received non zero pi_bytesin,"
1004 " but wrong data_direction\n");
1005 vhost_scsi_send_bad_target(vs, vq, head, out);
1006 continue;
1007 }
1008 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin);
1009 }
1010 /*
1011 * Set prot_iter to data_iter, and advance past any
1012 * preceeding prot_bytes that may be present.
1013 *
1014 * Also fix up the exp_data_len to reflect only the
1015 * actual data payload length.
1016 */
1017 if (prot_bytes) {
1018 exp_data_len -= prot_bytes;
1019 prot_iter = data_iter;
1020 iov_iter_advance(&data_iter, prot_bytes);
1021 }
1022 tag = vhost64_to_cpu(vq, v_req_pi.tag);
1023 task_attr = v_req_pi.task_attr;
1024 cdb = &v_req_pi.cdb[0];
1025 lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
1026 } else {
1027 tag = vhost64_to_cpu(vq, v_req.tag);
1028 task_attr = v_req.task_attr;
1029 cdb = &v_req.cdb[0];
1030 lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
1031 }
1032 /*
1033 * Check that the received CDB size does not exceeded our
1034 * hardcoded max for vhost-scsi, then get a pre-allocated
1035 * cmd descriptor for the new virtio-scsi tag.
1036 *
1037 * TODO what if cdb was too small for varlen cdb header?
1038 */
1039 if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) {
1040 vq_err(vq, "Received SCSI CDB with command_size: %d that"
1041 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1042 scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE);
1043 vhost_scsi_send_bad_target(vs, vq, head, out);
1044 continue;
1045 }
1046 cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr,
1047 exp_data_len + prot_bytes,
1048 data_direction);
1049 if (IS_ERR(cmd)) {
1050 vq_err(vq, "vhost_scsi_get_tag failed %ld\n",
1051 PTR_ERR(cmd));
1052 vhost_scsi_send_bad_target(vs, vq, head, out);
1053 continue;
1054 }
1055 cmd->tvc_vhost = vs;
1056 cmd->tvc_vq = vq;
1057 cmd->tvc_resp_iov = &vq->iov[out];
1058 cmd->tvc_in_iovs = in;
1059
1060 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
1061 cmd->tvc_cdb[0], cmd->tvc_lun);
1062 pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:"
1063 " %d\n", cmd, exp_data_len, prot_bytes, data_direction);
1064
1065 if (data_direction != DMA_NONE) {
1066 ret = vhost_scsi_mapal(cmd,
1067 prot_bytes, &prot_iter,
1068 exp_data_len, &data_iter);
1069 if (unlikely(ret)) {
1070 vq_err(vq, "Failed to map iov to sgl\n");
1071 vhost_scsi_release_cmd(&cmd->tvc_se_cmd);
1072 vhost_scsi_send_bad_target(vs, vq, head, out);
1073 continue;
1074 }
1075 }
1076 /*
1077 * Save the descriptor from vhost_get_vq_desc() to be used to
1078 * complete the virtio-scsi request in TCM callback context via
1079 * vhost_scsi_queue_data_in() and vhost_scsi_queue_status()
1080 */
1081 cmd->tvc_vq_desc = head;
1082 /*
1083 * Dispatch cmd descriptor for cmwq execution in process
1084 * context provided by vhost_scsi_workqueue. This also ensures
1085 * cmd is executed on the same kworker CPU as this vhost
1086 * thread to gain positive L2 cache locality effects.
1087 */
1088 INIT_WORK(&cmd->work, vhost_scsi_submission_work);
1089 queue_work(vhost_scsi_workqueue, &cmd->work);
1090 }
1091out:
1092 mutex_unlock(&vq->mutex);
1093}
1094
1095static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
1096{
1097 pr_debug("%s: The handling func for control queue.\n", __func__);
1098}
1099
1100static void
1101vhost_scsi_send_evt(struct vhost_scsi *vs,
1102 struct vhost_scsi_tpg *tpg,
1103 struct se_lun *lun,
1104 u32 event,
1105 u32 reason)
1106{
1107 struct vhost_scsi_evt *evt;
1108
1109 evt = vhost_scsi_allocate_evt(vs, event, reason);
1110 if (!evt)
1111 return;
1112
1113 if (tpg && lun) {
1114 /* TODO: share lun setup code with virtio-scsi.ko */
1115 /*
1116 * Note: evt->event is zeroed when we allocate it and
1117 * lun[4-7] need to be zero according to virtio-scsi spec.
1118 */
1119 evt->event.lun[0] = 0x01;
1120 evt->event.lun[1] = tpg->tport_tpgt;
1121 if (lun->unpacked_lun >= 256)
1122 evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
1123 evt->event.lun[3] = lun->unpacked_lun & 0xFF;
1124 }
1125
1126 llist_add(&evt->list, &vs->vs_event_list);
1127 vhost_work_queue(&vs->dev, &vs->vs_event_work);
1128}
1129
1130static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
1131{
1132 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1133 poll.work);
1134 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1135
1136 mutex_lock(&vq->mutex);
1137 if (!vq->private_data)
1138 goto out;
1139
1140 if (vs->vs_events_missed)
1141 vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
1142out:
1143 mutex_unlock(&vq->mutex);
1144}
1145
1146static void vhost_scsi_handle_kick(struct vhost_work *work)
1147{
1148 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1149 poll.work);
1150 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1151
1152 vhost_scsi_handle_vq(vs, vq);
1153}
1154
1155static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
1156{
1157 vhost_poll_flush(&vs->vqs[index].vq.poll);
1158}
1159
1160/* Callers must hold dev mutex */
1161static void vhost_scsi_flush(struct vhost_scsi *vs)
1162{
1163 struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];
1164 int i;
1165
1166 /* Init new inflight and remember the old inflight */
1167 vhost_scsi_init_inflight(vs, old_inflight);
1168
1169 /*
1170 * The inflight->kref was initialized to 1. We decrement it here to
1171 * indicate the start of the flush operation so that it will reach 0
1172 * when all the reqs are finished.
1173 */
1174 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1175 kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight);
1176
1177 /* Flush both the vhost poll and vhost work */
1178 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1179 vhost_scsi_flush_vq(vs, i);
1180 vhost_work_flush(&vs->dev, &vs->vs_completion_work);
1181 vhost_work_flush(&vs->dev, &vs->vs_event_work);
1182
1183 /* Wait for all reqs issued before the flush to be finished */
1184 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1185 wait_for_completion(&old_inflight[i]->comp);
1186}
1187
1188/*
1189 * Called from vhost_scsi_ioctl() context to walk the list of available
1190 * vhost_scsi_tpg with an active struct vhost_scsi_nexus
1191 *
1192 * The lock nesting rule is:
1193 * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
1194 */
1195static int
1196vhost_scsi_set_endpoint(struct vhost_scsi *vs,
1197 struct vhost_scsi_target *t)
1198{
1199 struct se_portal_group *se_tpg;
1200 struct vhost_scsi_tport *tv_tport;
1201 struct vhost_scsi_tpg *tpg;
1202 struct vhost_scsi_tpg **vs_tpg;
1203 struct vhost_virtqueue *vq;
1204 int index, ret, i, len;
1205 bool match = false;
1206
1207 mutex_lock(&vhost_scsi_mutex);
1208 mutex_lock(&vs->dev.mutex);
1209
1210 /* Verify that ring has been setup correctly. */
1211 for (index = 0; index < vs->dev.nvqs; ++index) {
1212 /* Verify that ring has been setup correctly. */
1213 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1214 ret = -EFAULT;
1215 goto out;
1216 }
1217 }
1218
1219 len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
1220 vs_tpg = kzalloc(len, GFP_KERNEL);
1221 if (!vs_tpg) {
1222 ret = -ENOMEM;
1223 goto out;
1224 }
1225 if (vs->vs_tpg)
1226 memcpy(vs_tpg, vs->vs_tpg, len);
1227
1228 list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) {
1229 mutex_lock(&tpg->tv_tpg_mutex);
1230 if (!tpg->tpg_nexus) {
1231 mutex_unlock(&tpg->tv_tpg_mutex);
1232 continue;
1233 }
1234 if (tpg->tv_tpg_vhost_count != 0) {
1235 mutex_unlock(&tpg->tv_tpg_mutex);
1236 continue;
1237 }
1238 tv_tport = tpg->tport;
1239
1240 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1241 if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
1242 kfree(vs_tpg);
1243 mutex_unlock(&tpg->tv_tpg_mutex);
1244 ret = -EEXIST;
1245 goto out;
1246 }
1247 /*
1248 * In order to ensure individual vhost-scsi configfs
1249 * groups cannot be removed while in use by vhost ioctl,
1250 * go ahead and take an explicit se_tpg->tpg_group.cg_item
1251 * dependency now.
1252 */
1253 se_tpg = &tpg->se_tpg;
1254 ret = target_depend_item(&se_tpg->tpg_group.cg_item);
1255 if (ret) {
1256 pr_warn("configfs_depend_item() failed: %d\n", ret);
1257 kfree(vs_tpg);
1258 mutex_unlock(&tpg->tv_tpg_mutex);
1259 goto out;
1260 }
1261 tpg->tv_tpg_vhost_count++;
1262 tpg->vhost_scsi = vs;
1263 vs_tpg[tpg->tport_tpgt] = tpg;
1264 smp_mb__after_atomic();
1265 match = true;
1266 }
1267 mutex_unlock(&tpg->tv_tpg_mutex);
1268 }
1269
1270 if (match) {
1271 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1272 sizeof(vs->vs_vhost_wwpn));
1273 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1274 vq = &vs->vqs[i].vq;
1275 mutex_lock(&vq->mutex);
1276 vq->private_data = vs_tpg;
1277 vhost_vq_init_access(vq);
1278 mutex_unlock(&vq->mutex);
1279 }
1280 ret = 0;
1281 } else {
1282 ret = -EEXIST;
1283 }
1284
1285 /*
1286 * Act as synchronize_rcu to make sure access to
1287 * old vs->vs_tpg is finished.
1288 */
1289 vhost_scsi_flush(vs);
1290 kfree(vs->vs_tpg);
1291 vs->vs_tpg = vs_tpg;
1292
1293out:
1294 mutex_unlock(&vs->dev.mutex);
1295 mutex_unlock(&vhost_scsi_mutex);
1296 return ret;
1297}
1298
1299static int
1300vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
1301 struct vhost_scsi_target *t)
1302{
1303 struct se_portal_group *se_tpg;
1304 struct vhost_scsi_tport *tv_tport;
1305 struct vhost_scsi_tpg *tpg;
1306 struct vhost_virtqueue *vq;
1307 bool match = false;
1308 int index, ret, i;
1309 u8 target;
1310
1311 mutex_lock(&vhost_scsi_mutex);
1312 mutex_lock(&vs->dev.mutex);
1313 /* Verify that ring has been setup correctly. */
1314 for (index = 0; index < vs->dev.nvqs; ++index) {
1315 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1316 ret = -EFAULT;
1317 goto err_dev;
1318 }
1319 }
1320
1321 if (!vs->vs_tpg) {
1322 ret = 0;
1323 goto err_dev;
1324 }
1325
1326 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1327 target = i;
1328 tpg = vs->vs_tpg[target];
1329 if (!tpg)
1330 continue;
1331
1332 mutex_lock(&tpg->tv_tpg_mutex);
1333 tv_tport = tpg->tport;
1334 if (!tv_tport) {
1335 ret = -ENODEV;
1336 goto err_tpg;
1337 }
1338
1339 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1340 pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
1341 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
1342 tv_tport->tport_name, tpg->tport_tpgt,
1343 t->vhost_wwpn, t->vhost_tpgt);
1344 ret = -EINVAL;
1345 goto err_tpg;
1346 }
1347 tpg->tv_tpg_vhost_count--;
1348 tpg->vhost_scsi = NULL;
1349 vs->vs_tpg[target] = NULL;
1350 match = true;
1351 mutex_unlock(&tpg->tv_tpg_mutex);
1352 /*
1353 * Release se_tpg->tpg_group.cg_item configfs dependency now
1354 * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur.
1355 */
1356 se_tpg = &tpg->se_tpg;
1357 target_undepend_item(&se_tpg->tpg_group.cg_item);
1358 }
1359 if (match) {
1360 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1361 vq = &vs->vqs[i].vq;
1362 mutex_lock(&vq->mutex);
1363 vq->private_data = NULL;
1364 mutex_unlock(&vq->mutex);
1365 }
1366 }
1367 /*
1368 * Act as synchronize_rcu to make sure access to
1369 * old vs->vs_tpg is finished.
1370 */
1371 vhost_scsi_flush(vs);
1372 kfree(vs->vs_tpg);
1373 vs->vs_tpg = NULL;
1374 WARN_ON(vs->vs_events_nr);
1375 mutex_unlock(&vs->dev.mutex);
1376 mutex_unlock(&vhost_scsi_mutex);
1377 return 0;
1378
1379err_tpg:
1380 mutex_unlock(&tpg->tv_tpg_mutex);
1381err_dev:
1382 mutex_unlock(&vs->dev.mutex);
1383 mutex_unlock(&vhost_scsi_mutex);
1384 return ret;
1385}
1386
1387static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1388{
1389 struct vhost_virtqueue *vq;
1390 int i;
1391
1392 if (features & ~VHOST_SCSI_FEATURES)
1393 return -EOPNOTSUPP;
1394
1395 mutex_lock(&vs->dev.mutex);
1396 if ((features & (1 << VHOST_F_LOG_ALL)) &&
1397 !vhost_log_access_ok(&vs->dev)) {
1398 mutex_unlock(&vs->dev.mutex);
1399 return -EFAULT;
1400 }
1401
1402 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1403 vq = &vs->vqs[i].vq;
1404 mutex_lock(&vq->mutex);
1405 vq->acked_features = features;
1406 mutex_unlock(&vq->mutex);
1407 }
1408 mutex_unlock(&vs->dev.mutex);
1409 return 0;
1410}
1411
1412static int vhost_scsi_open(struct inode *inode, struct file *f)
1413{
1414 struct vhost_scsi *vs;
1415 struct vhost_virtqueue **vqs;
1416 int r = -ENOMEM, i;
1417
1418 vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
1419 if (!vs) {
1420 vs = vzalloc(sizeof(*vs));
1421 if (!vs)
1422 goto err_vs;
1423 }
1424
1425 vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL);
1426 if (!vqs)
1427 goto err_vqs;
1428
1429 vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);
1430 vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);
1431
1432 vs->vs_events_nr = 0;
1433 vs->vs_events_missed = false;
1434
1435 vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
1436 vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1437 vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1438 vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
1439 for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
1440 vqs[i] = &vs->vqs[i].vq;
1441 vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
1442 }
1443 vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ);
1444
1445 vhost_scsi_init_inflight(vs, NULL);
1446
1447 f->private_data = vs;
1448 return 0;
1449
1450err_vqs:
1451 kvfree(vs);
1452err_vs:
1453 return r;
1454}
1455
1456static int vhost_scsi_release(struct inode *inode, struct file *f)
1457{
1458 struct vhost_scsi *vs = f->private_data;
1459 struct vhost_scsi_target t;
1460
1461 mutex_lock(&vs->dev.mutex);
1462 memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
1463 mutex_unlock(&vs->dev.mutex);
1464 vhost_scsi_clear_endpoint(vs, &t);
1465 vhost_dev_stop(&vs->dev);
1466 vhost_dev_cleanup(&vs->dev, false);
1467 /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
1468 vhost_scsi_flush(vs);
1469 kfree(vs->dev.vqs);
1470 kvfree(vs);
1471 return 0;
1472}
1473
1474static long
1475vhost_scsi_ioctl(struct file *f,
1476 unsigned int ioctl,
1477 unsigned long arg)
1478{
1479 struct vhost_scsi *vs = f->private_data;
1480 struct vhost_scsi_target backend;
1481 void __user *argp = (void __user *)arg;
1482 u64 __user *featurep = argp;
1483 u32 __user *eventsp = argp;
1484 u32 events_missed;
1485 u64 features;
1486 int r, abi_version = VHOST_SCSI_ABI_VERSION;
1487 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1488
1489 switch (ioctl) {
1490 case VHOST_SCSI_SET_ENDPOINT:
1491 if (copy_from_user(&backend, argp, sizeof backend))
1492 return -EFAULT;
1493 if (backend.reserved != 0)
1494 return -EOPNOTSUPP;
1495
1496 return vhost_scsi_set_endpoint(vs, &backend);
1497 case VHOST_SCSI_CLEAR_ENDPOINT:
1498 if (copy_from_user(&backend, argp, sizeof backend))
1499 return -EFAULT;
1500 if (backend.reserved != 0)
1501 return -EOPNOTSUPP;
1502
1503 return vhost_scsi_clear_endpoint(vs, &backend);
1504 case VHOST_SCSI_GET_ABI_VERSION:
1505 if (copy_to_user(argp, &abi_version, sizeof abi_version))
1506 return -EFAULT;
1507 return 0;
1508 case VHOST_SCSI_SET_EVENTS_MISSED:
1509 if (get_user(events_missed, eventsp))
1510 return -EFAULT;
1511 mutex_lock(&vq->mutex);
1512 vs->vs_events_missed = events_missed;
1513 mutex_unlock(&vq->mutex);
1514 return 0;
1515 case VHOST_SCSI_GET_EVENTS_MISSED:
1516 mutex_lock(&vq->mutex);
1517 events_missed = vs->vs_events_missed;
1518 mutex_unlock(&vq->mutex);
1519 if (put_user(events_missed, eventsp))
1520 return -EFAULT;
1521 return 0;
1522 case VHOST_GET_FEATURES:
1523 features = VHOST_SCSI_FEATURES;
1524 if (copy_to_user(featurep, &features, sizeof features))
1525 return -EFAULT;
1526 return 0;
1527 case VHOST_SET_FEATURES:
1528 if (copy_from_user(&features, featurep, sizeof features))
1529 return -EFAULT;
1530 return vhost_scsi_set_features(vs, features);
1531 default:
1532 mutex_lock(&vs->dev.mutex);
1533 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
1534 /* TODO: flush backend after dev ioctl. */
1535 if (r == -ENOIOCTLCMD)
1536 r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
1537 mutex_unlock(&vs->dev.mutex);
1538 return r;
1539 }
1540}
1541
1542#ifdef CONFIG_COMPAT
1543static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
1544 unsigned long arg)
1545{
1546 return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
1547}
1548#endif
1549
1550static const struct file_operations vhost_scsi_fops = {
1551 .owner = THIS_MODULE,
1552 .release = vhost_scsi_release,
1553 .unlocked_ioctl = vhost_scsi_ioctl,
1554#ifdef CONFIG_COMPAT
1555 .compat_ioctl = vhost_scsi_compat_ioctl,
1556#endif
1557 .open = vhost_scsi_open,
1558 .llseek = noop_llseek,
1559};
1560
1561static struct miscdevice vhost_scsi_misc = {
1562 MISC_DYNAMIC_MINOR,
1563 "vhost-scsi",
1564 &vhost_scsi_fops,
1565};
1566
1567static int __init vhost_scsi_register(void)
1568{
1569 return misc_register(&vhost_scsi_misc);
1570}
1571
1572static void vhost_scsi_deregister(void)
1573{
1574 misc_deregister(&vhost_scsi_misc);
1575}
1576
1577static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport)
1578{
1579 switch (tport->tport_proto_id) {
1580 case SCSI_PROTOCOL_SAS:
1581 return "SAS";
1582 case SCSI_PROTOCOL_FCP:
1583 return "FCP";
1584 case SCSI_PROTOCOL_ISCSI:
1585 return "iSCSI";
1586 default:
1587 break;
1588 }
1589
1590 return "Unknown";
1591}
1592
1593static void
1594vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg,
1595 struct se_lun *lun, bool plug)
1596{
1597
1598 struct vhost_scsi *vs = tpg->vhost_scsi;
1599 struct vhost_virtqueue *vq;
1600 u32 reason;
1601
1602 if (!vs)
1603 return;
1604
1605 mutex_lock(&vs->dev.mutex);
1606
1607 if (plug)
1608 reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
1609 else
1610 reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
1611
1612 vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1613 mutex_lock(&vq->mutex);
1614 if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG))
1615 vhost_scsi_send_evt(vs, tpg, lun,
1616 VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
1617 mutex_unlock(&vq->mutex);
1618 mutex_unlock(&vs->dev.mutex);
1619}
1620
1621static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1622{
1623 vhost_scsi_do_plug(tpg, lun, true);
1624}
1625
1626static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1627{
1628 vhost_scsi_do_plug(tpg, lun, false);
1629}
1630
1631static int vhost_scsi_port_link(struct se_portal_group *se_tpg,
1632 struct se_lun *lun)
1633{
1634 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1635 struct vhost_scsi_tpg, se_tpg);
1636
1637 mutex_lock(&vhost_scsi_mutex);
1638
1639 mutex_lock(&tpg->tv_tpg_mutex);
1640 tpg->tv_tpg_port_count++;
1641 mutex_unlock(&tpg->tv_tpg_mutex);
1642
1643 vhost_scsi_hotplug(tpg, lun);
1644
1645 mutex_unlock(&vhost_scsi_mutex);
1646
1647 return 0;
1648}
1649
1650static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
1651 struct se_lun *lun)
1652{
1653 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1654 struct vhost_scsi_tpg, se_tpg);
1655
1656 mutex_lock(&vhost_scsi_mutex);
1657
1658 mutex_lock(&tpg->tv_tpg_mutex);
1659 tpg->tv_tpg_port_count--;
1660 mutex_unlock(&tpg->tv_tpg_mutex);
1661
1662 vhost_scsi_hotunplug(tpg, lun);
1663
1664 mutex_unlock(&vhost_scsi_mutex);
1665}
1666
1667static void vhost_scsi_free_cmd_map_res(struct se_session *se_sess)
1668{
1669 struct vhost_scsi_cmd *tv_cmd;
1670 unsigned int i;
1671
1672 if (!se_sess->sess_cmd_map)
1673 return;
1674
1675 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1676 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1677
1678 kfree(tv_cmd->tvc_sgl);
1679 kfree(tv_cmd->tvc_prot_sgl);
1680 kfree(tv_cmd->tvc_upages);
1681 }
1682}
1683
1684static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store(
1685 struct config_item *item, const char *page, size_t count)
1686{
1687 struct se_portal_group *se_tpg = attrib_to_tpg(item);
1688 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1689 struct vhost_scsi_tpg, se_tpg);
1690 unsigned long val;
1691 int ret = kstrtoul(page, 0, &val);
1692
1693 if (ret) {
1694 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
1695 return ret;
1696 }
1697 if (val != 0 && val != 1 && val != 3) {
1698 pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val);
1699 return -EINVAL;
1700 }
1701 tpg->tv_fabric_prot_type = val;
1702
1703 return count;
1704}
1705
1706static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show(
1707 struct config_item *item, char *page)
1708{
1709 struct se_portal_group *se_tpg = attrib_to_tpg(item);
1710 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1711 struct vhost_scsi_tpg, se_tpg);
1712
1713 return sprintf(page, "%d\n", tpg->tv_fabric_prot_type);
1714}
1715
1716CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type);
1717
1718static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = {
1719 &vhost_scsi_tpg_attrib_attr_fabric_prot_type,
1720 NULL,
1721};
1722
1723static int vhost_scsi_nexus_cb(struct se_portal_group *se_tpg,
1724 struct se_session *se_sess, void *p)
1725{
1726 struct vhost_scsi_cmd *tv_cmd;
1727 unsigned int i;
1728
1729 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1730 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1731
1732 tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) *
1733 VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL);
1734 if (!tv_cmd->tvc_sgl) {
1735 pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
1736 goto out;
1737 }
1738
1739 tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) *
1740 VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL);
1741 if (!tv_cmd->tvc_upages) {
1742 pr_err("Unable to allocate tv_cmd->tvc_upages\n");
1743 goto out;
1744 }
1745
1746 tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) *
1747 VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL);
1748 if (!tv_cmd->tvc_prot_sgl) {
1749 pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
1750 goto out;
1751 }
1752 }
1753 return 0;
1754out:
1755 vhost_scsi_free_cmd_map_res(se_sess);
1756 return -ENOMEM;
1757}
1758
1759static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
1760 const char *name)
1761{
1762 struct se_portal_group *se_tpg;
1763 struct vhost_scsi_nexus *tv_nexus;
1764
1765 mutex_lock(&tpg->tv_tpg_mutex);
1766 if (tpg->tpg_nexus) {
1767 mutex_unlock(&tpg->tv_tpg_mutex);
1768 pr_debug("tpg->tpg_nexus already exists\n");
1769 return -EEXIST;
1770 }
1771 se_tpg = &tpg->se_tpg;
1772
1773 tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL);
1774 if (!tv_nexus) {
1775 mutex_unlock(&tpg->tv_tpg_mutex);
1776 pr_err("Unable to allocate struct vhost_scsi_nexus\n");
1777 return -ENOMEM;
1778 }
1779 /*
1780 * Since we are running in 'demo mode' this call with generate a
1781 * struct se_node_acl for the vhost_scsi struct se_portal_group with
1782 * the SCSI Initiator port name of the passed configfs group 'name'.
1783 */
1784 tv_nexus->tvn_se_sess = target_alloc_session(&tpg->se_tpg,
1785 VHOST_SCSI_DEFAULT_TAGS,
1786 sizeof(struct vhost_scsi_cmd),
1787 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
1788 (unsigned char *)name, tv_nexus,
1789 vhost_scsi_nexus_cb);
1790 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1791 mutex_unlock(&tpg->tv_tpg_mutex);
1792 kfree(tv_nexus);
1793 return -ENOMEM;
1794 }
1795 tpg->tpg_nexus = tv_nexus;
1796
1797 mutex_unlock(&tpg->tv_tpg_mutex);
1798 return 0;
1799}
1800
1801static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
1802{
1803 struct se_session *se_sess;
1804 struct vhost_scsi_nexus *tv_nexus;
1805
1806 mutex_lock(&tpg->tv_tpg_mutex);
1807 tv_nexus = tpg->tpg_nexus;
1808 if (!tv_nexus) {
1809 mutex_unlock(&tpg->tv_tpg_mutex);
1810 return -ENODEV;
1811 }
1812
1813 se_sess = tv_nexus->tvn_se_sess;
1814 if (!se_sess) {
1815 mutex_unlock(&tpg->tv_tpg_mutex);
1816 return -ENODEV;
1817 }
1818
1819 if (tpg->tv_tpg_port_count != 0) {
1820 mutex_unlock(&tpg->tv_tpg_mutex);
1821 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1822 " active TPG port count: %d\n",
1823 tpg->tv_tpg_port_count);
1824 return -EBUSY;
1825 }
1826
1827 if (tpg->tv_tpg_vhost_count != 0) {
1828 mutex_unlock(&tpg->tv_tpg_mutex);
1829 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1830 " active TPG vhost count: %d\n",
1831 tpg->tv_tpg_vhost_count);
1832 return -EBUSY;
1833 }
1834
1835 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
1836 " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport),
1837 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1838
1839 vhost_scsi_free_cmd_map_res(se_sess);
1840 /*
1841 * Release the SCSI I_T Nexus to the emulated vhost Target Port
1842 */
1843 transport_deregister_session(tv_nexus->tvn_se_sess);
1844 tpg->tpg_nexus = NULL;
1845 mutex_unlock(&tpg->tv_tpg_mutex);
1846
1847 kfree(tv_nexus);
1848 return 0;
1849}
1850
1851static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page)
1852{
1853 struct se_portal_group *se_tpg = to_tpg(item);
1854 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1855 struct vhost_scsi_tpg, se_tpg);
1856 struct vhost_scsi_nexus *tv_nexus;
1857 ssize_t ret;
1858
1859 mutex_lock(&tpg->tv_tpg_mutex);
1860 tv_nexus = tpg->tpg_nexus;
1861 if (!tv_nexus) {
1862 mutex_unlock(&tpg->tv_tpg_mutex);
1863 return -ENODEV;
1864 }
1865 ret = snprintf(page, PAGE_SIZE, "%s\n",
1866 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1867 mutex_unlock(&tpg->tv_tpg_mutex);
1868
1869 return ret;
1870}
1871
1872static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item,
1873 const char *page, size_t count)
1874{
1875 struct se_portal_group *se_tpg = to_tpg(item);
1876 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1877 struct vhost_scsi_tpg, se_tpg);
1878 struct vhost_scsi_tport *tport_wwn = tpg->tport;
1879 unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr;
1880 int ret;
1881 /*
1882 * Shutdown the active I_T nexus if 'NULL' is passed..
1883 */
1884 if (!strncmp(page, "NULL", 4)) {
1885 ret = vhost_scsi_drop_nexus(tpg);
1886 return (!ret) ? count : ret;
1887 }
1888 /*
1889 * Otherwise make sure the passed virtual Initiator port WWN matches
1890 * the fabric protocol_id set in vhost_scsi_make_tport(), and call
1891 * vhost_scsi_make_nexus().
1892 */
1893 if (strlen(page) >= VHOST_SCSI_NAMELEN) {
1894 pr_err("Emulated NAA Sas Address: %s, exceeds"
1895 " max: %d\n", page, VHOST_SCSI_NAMELEN);
1896 return -EINVAL;
1897 }
1898 snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page);
1899
1900 ptr = strstr(i_port, "naa.");
1901 if (ptr) {
1902 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1903 pr_err("Passed SAS Initiator Port %s does not"
1904 " match target port protoid: %s\n", i_port,
1905 vhost_scsi_dump_proto_id(tport_wwn));
1906 return -EINVAL;
1907 }
1908 port_ptr = &i_port[0];
1909 goto check_newline;
1910 }
1911 ptr = strstr(i_port, "fc.");
1912 if (ptr) {
1913 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1914 pr_err("Passed FCP Initiator Port %s does not"
1915 " match target port protoid: %s\n", i_port,
1916 vhost_scsi_dump_proto_id(tport_wwn));
1917 return -EINVAL;
1918 }
1919 port_ptr = &i_port[3]; /* Skip over "fc." */
1920 goto check_newline;
1921 }
1922 ptr = strstr(i_port, "iqn.");
1923 if (ptr) {
1924 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1925 pr_err("Passed iSCSI Initiator Port %s does not"
1926 " match target port protoid: %s\n", i_port,
1927 vhost_scsi_dump_proto_id(tport_wwn));
1928 return -EINVAL;
1929 }
1930 port_ptr = &i_port[0];
1931 goto check_newline;
1932 }
1933 pr_err("Unable to locate prefix for emulated Initiator Port:"
1934 " %s\n", i_port);
1935 return -EINVAL;
1936 /*
1937 * Clear any trailing newline for the NAA WWN
1938 */
1939check_newline:
1940 if (i_port[strlen(i_port)-1] == '\n')
1941 i_port[strlen(i_port)-1] = '\0';
1942
1943 ret = vhost_scsi_make_nexus(tpg, port_ptr);
1944 if (ret < 0)
1945 return ret;
1946
1947 return count;
1948}
1949
1950CONFIGFS_ATTR(vhost_scsi_tpg_, nexus);
1951
1952static struct configfs_attribute *vhost_scsi_tpg_attrs[] = {
1953 &vhost_scsi_tpg_attr_nexus,
1954 NULL,
1955};
1956
1957static struct se_portal_group *
1958vhost_scsi_make_tpg(struct se_wwn *wwn,
1959 struct config_group *group,
1960 const char *name)
1961{
1962 struct vhost_scsi_tport *tport = container_of(wwn,
1963 struct vhost_scsi_tport, tport_wwn);
1964
1965 struct vhost_scsi_tpg *tpg;
1966 u16 tpgt;
1967 int ret;
1968
1969 if (strstr(name, "tpgt_") != name)
1970 return ERR_PTR(-EINVAL);
1971 if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET)
1972 return ERR_PTR(-EINVAL);
1973
1974 tpg = kzalloc(sizeof(struct vhost_scsi_tpg), GFP_KERNEL);
1975 if (!tpg) {
1976 pr_err("Unable to allocate struct vhost_scsi_tpg");
1977 return ERR_PTR(-ENOMEM);
1978 }
1979 mutex_init(&tpg->tv_tpg_mutex);
1980 INIT_LIST_HEAD(&tpg->tv_tpg_list);
1981 tpg->tport = tport;
1982 tpg->tport_tpgt = tpgt;
1983
1984 ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id);
1985 if (ret < 0) {
1986 kfree(tpg);
1987 return NULL;
1988 }
1989 mutex_lock(&vhost_scsi_mutex);
1990 list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list);
1991 mutex_unlock(&vhost_scsi_mutex);
1992
1993 return &tpg->se_tpg;
1994}
1995
1996static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg)
1997{
1998 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1999 struct vhost_scsi_tpg, se_tpg);
2000
2001 mutex_lock(&vhost_scsi_mutex);
2002 list_del(&tpg->tv_tpg_list);
2003 mutex_unlock(&vhost_scsi_mutex);
2004 /*
2005 * Release the virtual I_T Nexus for this vhost TPG
2006 */
2007 vhost_scsi_drop_nexus(tpg);
2008 /*
2009 * Deregister the se_tpg from TCM..
2010 */
2011 core_tpg_deregister(se_tpg);
2012 kfree(tpg);
2013}
2014
2015static struct se_wwn *
2016vhost_scsi_make_tport(struct target_fabric_configfs *tf,
2017 struct config_group *group,
2018 const char *name)
2019{
2020 struct vhost_scsi_tport *tport;
2021 char *ptr;
2022 u64 wwpn = 0;
2023 int off = 0;
2024
2025 /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
2026 return ERR_PTR(-EINVAL); */
2027
2028 tport = kzalloc(sizeof(struct vhost_scsi_tport), GFP_KERNEL);
2029 if (!tport) {
2030 pr_err("Unable to allocate struct vhost_scsi_tport");
2031 return ERR_PTR(-ENOMEM);
2032 }
2033 tport->tport_wwpn = wwpn;
2034 /*
2035 * Determine the emulated Protocol Identifier and Target Port Name
2036 * based on the incoming configfs directory name.
2037 */
2038 ptr = strstr(name, "naa.");
2039 if (ptr) {
2040 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
2041 goto check_len;
2042 }
2043 ptr = strstr(name, "fc.");
2044 if (ptr) {
2045 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
2046 off = 3; /* Skip over "fc." */
2047 goto check_len;
2048 }
2049 ptr = strstr(name, "iqn.");
2050 if (ptr) {
2051 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
2052 goto check_len;
2053 }
2054
2055 pr_err("Unable to locate prefix for emulated Target Port:"
2056 " %s\n", name);
2057 kfree(tport);
2058 return ERR_PTR(-EINVAL);
2059
2060check_len:
2061 if (strlen(name) >= VHOST_SCSI_NAMELEN) {
2062 pr_err("Emulated %s Address: %s, exceeds"
2063 " max: %d\n", name, vhost_scsi_dump_proto_id(tport),
2064 VHOST_SCSI_NAMELEN);
2065 kfree(tport);
2066 return ERR_PTR(-EINVAL);
2067 }
2068 snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]);
2069
2070 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
2071 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name);
2072
2073 return &tport->tport_wwn;
2074}
2075
2076static void vhost_scsi_drop_tport(struct se_wwn *wwn)
2077{
2078 struct vhost_scsi_tport *tport = container_of(wwn,
2079 struct vhost_scsi_tport, tport_wwn);
2080
2081 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
2082 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport),
2083 tport->tport_name);
2084
2085 kfree(tport);
2086}
2087
2088static ssize_t
2089vhost_scsi_wwn_version_show(struct config_item *item, char *page)
2090{
2091 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
2092 "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2093 utsname()->machine);
2094}
2095
2096CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version);
2097
2098static struct configfs_attribute *vhost_scsi_wwn_attrs[] = {
2099 &vhost_scsi_wwn_attr_version,
2100 NULL,
2101};
2102
2103static struct target_core_fabric_ops vhost_scsi_ops = {
2104 .module = THIS_MODULE,
2105 .name = "vhost",
2106 .get_fabric_name = vhost_scsi_get_fabric_name,
2107 .tpg_get_wwn = vhost_scsi_get_fabric_wwn,
2108 .tpg_get_tag = vhost_scsi_get_tpgt,
2109 .tpg_check_demo_mode = vhost_scsi_check_true,
2110 .tpg_check_demo_mode_cache = vhost_scsi_check_true,
2111 .tpg_check_demo_mode_write_protect = vhost_scsi_check_false,
2112 .tpg_check_prod_mode_write_protect = vhost_scsi_check_false,
2113 .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only,
2114 .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index,
2115 .release_cmd = vhost_scsi_release_cmd,
2116 .check_stop_free = vhost_scsi_check_stop_free,
2117 .shutdown_session = vhost_scsi_shutdown_session,
2118 .close_session = vhost_scsi_close_session,
2119 .sess_get_index = vhost_scsi_sess_get_index,
2120 .sess_get_initiator_sid = NULL,
2121 .write_pending = vhost_scsi_write_pending,
2122 .write_pending_status = vhost_scsi_write_pending_status,
2123 .set_default_node_attributes = vhost_scsi_set_default_node_attrs,
2124 .get_cmd_state = vhost_scsi_get_cmd_state,
2125 .queue_data_in = vhost_scsi_queue_data_in,
2126 .queue_status = vhost_scsi_queue_status,
2127 .queue_tm_rsp = vhost_scsi_queue_tm_rsp,
2128 .aborted_task = vhost_scsi_aborted_task,
2129 /*
2130 * Setup callers for generic logic in target_core_fabric_configfs.c
2131 */
2132 .fabric_make_wwn = vhost_scsi_make_tport,
2133 .fabric_drop_wwn = vhost_scsi_drop_tport,
2134 .fabric_make_tpg = vhost_scsi_make_tpg,
2135 .fabric_drop_tpg = vhost_scsi_drop_tpg,
2136 .fabric_post_link = vhost_scsi_port_link,
2137 .fabric_pre_unlink = vhost_scsi_port_unlink,
2138
2139 .tfc_wwn_attrs = vhost_scsi_wwn_attrs,
2140 .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs,
2141 .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs,
2142};
2143
2144static int __init vhost_scsi_init(void)
2145{
2146 int ret = -ENOMEM;
2147
2148 pr_debug("TCM_VHOST fabric module %s on %s/%s"
2149 " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2150 utsname()->machine);
2151
2152 /*
2153 * Use our own dedicated workqueue for submitting I/O into
2154 * target core to avoid contention within system_wq.
2155 */
2156 vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0);
2157 if (!vhost_scsi_workqueue)
2158 goto out;
2159
2160 ret = vhost_scsi_register();
2161 if (ret < 0)
2162 goto out_destroy_workqueue;
2163
2164 ret = target_register_template(&vhost_scsi_ops);
2165 if (ret < 0)
2166 goto out_vhost_scsi_deregister;
2167
2168 return 0;
2169
2170out_vhost_scsi_deregister:
2171 vhost_scsi_deregister();
2172out_destroy_workqueue:
2173 destroy_workqueue(vhost_scsi_workqueue);
2174out:
2175 return ret;
2176};
2177
2178static void vhost_scsi_exit(void)
2179{
2180 target_unregister_template(&vhost_scsi_ops);
2181 vhost_scsi_deregister();
2182 destroy_workqueue(vhost_scsi_workqueue);
2183};
2184
2185MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2186MODULE_ALIAS("tcm_vhost");
2187MODULE_LICENSE("GPL");
2188module_init(vhost_scsi_init);
2189module_exit(vhost_scsi_exit);