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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 u32 vhost_scsi_sess_get_index(struct se_session *se_sess)
337{
338 return 0;
339}
340
341static int vhost_scsi_write_pending(struct se_cmd *se_cmd)
342{
343 /* Go ahead and process the write immediately */
344 target_execute_cmd(se_cmd);
345 return 0;
346}
347
348static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd)
349{
350 return 0;
351}
352
353static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl)
354{
355 return;
356}
357
358static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd)
359{
360 return 0;
361}
362
363static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd)
364{
365 struct vhost_scsi *vs = cmd->tvc_vhost;
366
367 llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);
368
369 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
370}
371
372static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd)
373{
374 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
375 struct vhost_scsi_cmd, tvc_se_cmd);
376 vhost_scsi_complete_cmd(cmd);
377 return 0;
378}
379
380static int vhost_scsi_queue_status(struct se_cmd *se_cmd)
381{
382 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
383 struct vhost_scsi_cmd, tvc_se_cmd);
384 vhost_scsi_complete_cmd(cmd);
385 return 0;
386}
387
388static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd)
389{
390 return;
391}
392
393static void vhost_scsi_aborted_task(struct se_cmd *se_cmd)
394{
395 return;
396}
397
398static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
399{
400 vs->vs_events_nr--;
401 kfree(evt);
402}
403
404static struct vhost_scsi_evt *
405vhost_scsi_allocate_evt(struct vhost_scsi *vs,
406 u32 event, u32 reason)
407{
408 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
409 struct vhost_scsi_evt *evt;
410
411 if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
412 vs->vs_events_missed = true;
413 return NULL;
414 }
415
416 evt = kzalloc(sizeof(*evt), GFP_KERNEL);
417 if (!evt) {
418 vq_err(vq, "Failed to allocate vhost_scsi_evt\n");
419 vs->vs_events_missed = true;
420 return NULL;
421 }
422
423 evt->event.event = cpu_to_vhost32(vq, event);
424 evt->event.reason = cpu_to_vhost32(vq, reason);
425 vs->vs_events_nr++;
426
427 return evt;
428}
429
430static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd)
431{
432 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
433
434 /* TODO locking against target/backend threads? */
435 transport_generic_free_cmd(se_cmd, 0);
436
437}
438
439static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
440{
441 return target_put_sess_cmd(se_cmd);
442}
443
444static void
445vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
446{
447 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
448 struct virtio_scsi_event *event = &evt->event;
449 struct virtio_scsi_event __user *eventp;
450 unsigned out, in;
451 int head, ret;
452
453 if (!vq->private_data) {
454 vs->vs_events_missed = true;
455 return;
456 }
457
458again:
459 vhost_disable_notify(&vs->dev, vq);
460 head = vhost_get_vq_desc(vq, vq->iov,
461 ARRAY_SIZE(vq->iov), &out, &in,
462 NULL, NULL);
463 if (head < 0) {
464 vs->vs_events_missed = true;
465 return;
466 }
467 if (head == vq->num) {
468 if (vhost_enable_notify(&vs->dev, vq))
469 goto again;
470 vs->vs_events_missed = true;
471 return;
472 }
473
474 if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
475 vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
476 vq->iov[out].iov_len);
477 vs->vs_events_missed = true;
478 return;
479 }
480
481 if (vs->vs_events_missed) {
482 event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED);
483 vs->vs_events_missed = false;
484 }
485
486 eventp = vq->iov[out].iov_base;
487 ret = __copy_to_user(eventp, event, sizeof(*event));
488 if (!ret)
489 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
490 else
491 vq_err(vq, "Faulted on vhost_scsi_send_event\n");
492}
493
494static void vhost_scsi_evt_work(struct vhost_work *work)
495{
496 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
497 vs_event_work);
498 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
499 struct vhost_scsi_evt *evt;
500 struct llist_node *llnode;
501
502 mutex_lock(&vq->mutex);
503 llnode = llist_del_all(&vs->vs_event_list);
504 while (llnode) {
505 evt = llist_entry(llnode, struct vhost_scsi_evt, list);
506 llnode = llist_next(llnode);
507 vhost_scsi_do_evt_work(vs, evt);
508 vhost_scsi_free_evt(vs, evt);
509 }
510 mutex_unlock(&vq->mutex);
511}
512
513/* Fill in status and signal that we are done processing this command
514 *
515 * This is scheduled in the vhost work queue so we are called with the owner
516 * process mm and can access the vring.
517 */
518static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
519{
520 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
521 vs_completion_work);
522 DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
523 struct virtio_scsi_cmd_resp v_rsp;
524 struct vhost_scsi_cmd *cmd;
525 struct llist_node *llnode;
526 struct se_cmd *se_cmd;
527 struct iov_iter iov_iter;
528 int ret, vq;
529
530 bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
531 llnode = llist_del_all(&vs->vs_completion_list);
532 while (llnode) {
533 cmd = llist_entry(llnode, struct vhost_scsi_cmd,
534 tvc_completion_list);
535 llnode = llist_next(llnode);
536 se_cmd = &cmd->tvc_se_cmd;
537
538 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
539 cmd, se_cmd->residual_count, se_cmd->scsi_status);
540
541 memset(&v_rsp, 0, sizeof(v_rsp));
542 v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count);
543 /* TODO is status_qualifier field needed? */
544 v_rsp.status = se_cmd->scsi_status;
545 v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq,
546 se_cmd->scsi_sense_length);
547 memcpy(v_rsp.sense, cmd->tvc_sense_buf,
548 se_cmd->scsi_sense_length);
549
550 iov_iter_init(&iov_iter, READ, &cmd->tvc_resp_iov,
551 cmd->tvc_in_iovs, sizeof(v_rsp));
552 ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter);
553 if (likely(ret == sizeof(v_rsp))) {
554 struct vhost_scsi_virtqueue *q;
555 vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
556 q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
557 vq = q - vs->vqs;
558 __set_bit(vq, signal);
559 } else
560 pr_err("Faulted on virtio_scsi_cmd_resp\n");
561
562 vhost_scsi_free_cmd(cmd);
563 }
564
565 vq = -1;
566 while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
567 < VHOST_SCSI_MAX_VQ)
568 vhost_signal(&vs->dev, &vs->vqs[vq].vq);
569}
570
571static struct vhost_scsi_cmd *
572vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg,
573 unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
574 u32 exp_data_len, int data_direction)
575{
576 struct vhost_scsi_cmd *cmd;
577 struct vhost_scsi_nexus *tv_nexus;
578 struct se_session *se_sess;
579 struct scatterlist *sg, *prot_sg;
580 struct page **pages;
581 int tag;
582
583 tv_nexus = tpg->tpg_nexus;
584 if (!tv_nexus) {
585 pr_err("Unable to locate active struct vhost_scsi_nexus\n");
586 return ERR_PTR(-EIO);
587 }
588 se_sess = tv_nexus->tvn_se_sess;
589
590 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING);
591 if (tag < 0) {
592 pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
593 return ERR_PTR(-ENOMEM);
594 }
595
596 cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag];
597 sg = cmd->tvc_sgl;
598 prot_sg = cmd->tvc_prot_sgl;
599 pages = cmd->tvc_upages;
600 memset(cmd, 0, sizeof(struct vhost_scsi_cmd));
601
602 cmd->tvc_sgl = sg;
603 cmd->tvc_prot_sgl = prot_sg;
604 cmd->tvc_upages = pages;
605 cmd->tvc_se_cmd.map_tag = tag;
606 cmd->tvc_tag = scsi_tag;
607 cmd->tvc_lun = lun;
608 cmd->tvc_task_attr = task_attr;
609 cmd->tvc_exp_data_len = exp_data_len;
610 cmd->tvc_data_direction = data_direction;
611 cmd->tvc_nexus = tv_nexus;
612 cmd->inflight = vhost_scsi_get_inflight(vq);
613
614 memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE);
615
616 return cmd;
617}
618
619/*
620 * Map a user memory range into a scatterlist
621 *
622 * Returns the number of scatterlist entries used or -errno on error.
623 */
624static int
625vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd,
626 void __user *ptr,
627 size_t len,
628 struct scatterlist *sgl,
629 bool write)
630{
631 unsigned int npages = 0, offset, nbytes;
632 unsigned int pages_nr = iov_num_pages(ptr, len);
633 struct scatterlist *sg = sgl;
634 struct page **pages = cmd->tvc_upages;
635 int ret, i;
636
637 if (pages_nr > VHOST_SCSI_PREALLOC_UPAGES) {
638 pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
639 " preallocated VHOST_SCSI_PREALLOC_UPAGES: %u\n",
640 pages_nr, VHOST_SCSI_PREALLOC_UPAGES);
641 return -ENOBUFS;
642 }
643
644 ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
645 /* No pages were pinned */
646 if (ret < 0)
647 goto out;
648 /* Less pages pinned than wanted */
649 if (ret != pages_nr) {
650 for (i = 0; i < ret; i++)
651 put_page(pages[i]);
652 ret = -EFAULT;
653 goto out;
654 }
655
656 while (len > 0) {
657 offset = (uintptr_t)ptr & ~PAGE_MASK;
658 nbytes = min_t(unsigned int, PAGE_SIZE - offset, len);
659 sg_set_page(sg, pages[npages], nbytes, offset);
660 ptr += nbytes;
661 len -= nbytes;
662 sg++;
663 npages++;
664 }
665
666out:
667 return ret;
668}
669
670static int
671vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls)
672{
673 int sgl_count = 0;
674
675 if (!iter || !iter->iov) {
676 pr_err("%s: iter->iov is NULL, but expected bytes: %zu"
677 " present\n", __func__, bytes);
678 return -EINVAL;
679 }
680
681 sgl_count = iov_iter_npages(iter, 0xffff);
682 if (sgl_count > max_sgls) {
683 pr_err("%s: requested sgl_count: %d exceeds pre-allocated"
684 " max_sgls: %d\n", __func__, sgl_count, max_sgls);
685 return -EINVAL;
686 }
687 return sgl_count;
688}
689
690static int
691vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write,
692 struct iov_iter *iter,
693 struct scatterlist *sg, int sg_count)
694{
695 size_t off = iter->iov_offset;
696 int i, ret;
697
698 for (i = 0; i < iter->nr_segs; i++) {
699 void __user *base = iter->iov[i].iov_base + off;
700 size_t len = iter->iov[i].iov_len - off;
701
702 ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write);
703 if (ret < 0) {
704 for (i = 0; i < sg_count; i++) {
705 struct page *page = sg_page(&sg[i]);
706 if (page)
707 put_page(page);
708 }
709 return ret;
710 }
711 sg += ret;
712 off = 0;
713 }
714 return 0;
715}
716
717static int
718vhost_scsi_mapal(struct vhost_scsi_cmd *cmd,
719 size_t prot_bytes, struct iov_iter *prot_iter,
720 size_t data_bytes, struct iov_iter *data_iter)
721{
722 int sgl_count, ret;
723 bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE);
724
725 if (prot_bytes) {
726 sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes,
727 VHOST_SCSI_PREALLOC_PROT_SGLS);
728 if (sgl_count < 0)
729 return sgl_count;
730
731 sg_init_table(cmd->tvc_prot_sgl, sgl_count);
732 cmd->tvc_prot_sgl_count = sgl_count;
733 pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
734 cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count);
735
736 ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter,
737 cmd->tvc_prot_sgl,
738 cmd->tvc_prot_sgl_count);
739 if (ret < 0) {
740 cmd->tvc_prot_sgl_count = 0;
741 return ret;
742 }
743 }
744 sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes,
745 VHOST_SCSI_PREALLOC_SGLS);
746 if (sgl_count < 0)
747 return sgl_count;
748
749 sg_init_table(cmd->tvc_sgl, sgl_count);
750 cmd->tvc_sgl_count = sgl_count;
751 pr_debug("%s data_sg %p data_sgl_count %u\n", __func__,
752 cmd->tvc_sgl, cmd->tvc_sgl_count);
753
754 ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter,
755 cmd->tvc_sgl, cmd->tvc_sgl_count);
756 if (ret < 0) {
757 cmd->tvc_sgl_count = 0;
758 return ret;
759 }
760 return 0;
761}
762
763static int vhost_scsi_to_tcm_attr(int attr)
764{
765 switch (attr) {
766 case VIRTIO_SCSI_S_SIMPLE:
767 return TCM_SIMPLE_TAG;
768 case VIRTIO_SCSI_S_ORDERED:
769 return TCM_ORDERED_TAG;
770 case VIRTIO_SCSI_S_HEAD:
771 return TCM_HEAD_TAG;
772 case VIRTIO_SCSI_S_ACA:
773 return TCM_ACA_TAG;
774 default:
775 break;
776 }
777 return TCM_SIMPLE_TAG;
778}
779
780static void vhost_scsi_submission_work(struct work_struct *work)
781{
782 struct vhost_scsi_cmd *cmd =
783 container_of(work, struct vhost_scsi_cmd, work);
784 struct vhost_scsi_nexus *tv_nexus;
785 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
786 struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
787 int rc;
788
789 /* FIXME: BIDI operation */
790 if (cmd->tvc_sgl_count) {
791 sg_ptr = cmd->tvc_sgl;
792
793 if (cmd->tvc_prot_sgl_count)
794 sg_prot_ptr = cmd->tvc_prot_sgl;
795 else
796 se_cmd->prot_pto = true;
797 } else {
798 sg_ptr = NULL;
799 }
800 tv_nexus = cmd->tvc_nexus;
801
802 se_cmd->tag = 0;
803 rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
804 cmd->tvc_cdb, &cmd->tvc_sense_buf[0],
805 cmd->tvc_lun, cmd->tvc_exp_data_len,
806 vhost_scsi_to_tcm_attr(cmd->tvc_task_attr),
807 cmd->tvc_data_direction, TARGET_SCF_ACK_KREF,
808 sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr,
809 cmd->tvc_prot_sgl_count);
810 if (rc < 0) {
811 transport_send_check_condition_and_sense(se_cmd,
812 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
813 transport_generic_free_cmd(se_cmd, 0);
814 }
815}
816
817static void
818vhost_scsi_send_bad_target(struct vhost_scsi *vs,
819 struct vhost_virtqueue *vq,
820 int head, unsigned out)
821{
822 struct virtio_scsi_cmd_resp __user *resp;
823 struct virtio_scsi_cmd_resp rsp;
824 int ret;
825
826 memset(&rsp, 0, sizeof(rsp));
827 rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
828 resp = vq->iov[out].iov_base;
829 ret = __copy_to_user(resp, &rsp, sizeof(rsp));
830 if (!ret)
831 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
832 else
833 pr_err("Faulted on virtio_scsi_cmd_resp\n");
834}
835
836static void
837vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
838{
839 struct vhost_scsi_tpg **vs_tpg, *tpg;
840 struct virtio_scsi_cmd_req v_req;
841 struct virtio_scsi_cmd_req_pi v_req_pi;
842 struct vhost_scsi_cmd *cmd;
843 struct iov_iter out_iter, in_iter, prot_iter, data_iter;
844 u64 tag;
845 u32 exp_data_len, data_direction;
846 unsigned int out = 0, in = 0;
847 int head, ret, prot_bytes;
848 size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp);
849 size_t out_size, in_size;
850 u16 lun;
851 u8 *target, *lunp, task_attr;
852 bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI);
853 void *req, *cdb;
854
855 mutex_lock(&vq->mutex);
856 /*
857 * We can handle the vq only after the endpoint is setup by calling the
858 * VHOST_SCSI_SET_ENDPOINT ioctl.
859 */
860 vs_tpg = vq->private_data;
861 if (!vs_tpg)
862 goto out;
863
864 vhost_disable_notify(&vs->dev, vq);
865
866 for (;;) {
867 head = vhost_get_vq_desc(vq, vq->iov,
868 ARRAY_SIZE(vq->iov), &out, &in,
869 NULL, NULL);
870 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
871 head, out, in);
872 /* On error, stop handling until the next kick. */
873 if (unlikely(head < 0))
874 break;
875 /* Nothing new? Wait for eventfd to tell us they refilled. */
876 if (head == vq->num) {
877 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
878 vhost_disable_notify(&vs->dev, vq);
879 continue;
880 }
881 break;
882 }
883 /*
884 * Check for a sane response buffer so we can report early
885 * errors back to the guest.
886 */
887 if (unlikely(vq->iov[out].iov_len < rsp_size)) {
888 vq_err(vq, "Expecting at least virtio_scsi_cmd_resp"
889 " size, got %zu bytes\n", vq->iov[out].iov_len);
890 break;
891 }
892 /*
893 * Setup pointers and values based upon different virtio-scsi
894 * request header if T10_PI is enabled in KVM guest.
895 */
896 if (t10_pi) {
897 req = &v_req_pi;
898 req_size = sizeof(v_req_pi);
899 lunp = &v_req_pi.lun[0];
900 target = &v_req_pi.lun[1];
901 } else {
902 req = &v_req;
903 req_size = sizeof(v_req);
904 lunp = &v_req.lun[0];
905 target = &v_req.lun[1];
906 }
907 /*
908 * FIXME: Not correct for BIDI operation
909 */
910 out_size = iov_length(vq->iov, out);
911 in_size = iov_length(&vq->iov[out], in);
912
913 /*
914 * Copy over the virtio-scsi request header, which for a
915 * ANY_LAYOUT enabled guest may span multiple iovecs, or a
916 * single iovec may contain both the header + outgoing
917 * WRITE payloads.
918 *
919 * copy_from_iter() will advance out_iter, so that it will
920 * point at the start of the outgoing WRITE payload, if
921 * DMA_TO_DEVICE is set.
922 */
923 iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size);
924
925 if (unlikely(!copy_from_iter_full(req, req_size, &out_iter))) {
926 vq_err(vq, "Faulted on copy_from_iter\n");
927 vhost_scsi_send_bad_target(vs, vq, head, out);
928 continue;
929 }
930 /* virtio-scsi spec requires byte 0 of the lun to be 1 */
931 if (unlikely(*lunp != 1)) {
932 vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp);
933 vhost_scsi_send_bad_target(vs, vq, head, out);
934 continue;
935 }
936
937 tpg = ACCESS_ONCE(vs_tpg[*target]);
938 if (unlikely(!tpg)) {
939 /* Target does not exist, fail the request */
940 vhost_scsi_send_bad_target(vs, vq, head, out);
941 continue;
942 }
943 /*
944 * Determine data_direction by calculating the total outgoing
945 * iovec sizes + incoming iovec sizes vs. virtio-scsi request +
946 * response headers respectively.
947 *
948 * For DMA_TO_DEVICE this is out_iter, which is already pointing
949 * to the right place.
950 *
951 * For DMA_FROM_DEVICE, the iovec will be just past the end
952 * of the virtio-scsi response header in either the same
953 * or immediately following iovec.
954 *
955 * Any associated T10_PI bytes for the outgoing / incoming
956 * payloads are included in calculation of exp_data_len here.
957 */
958 prot_bytes = 0;
959
960 if (out_size > req_size) {
961 data_direction = DMA_TO_DEVICE;
962 exp_data_len = out_size - req_size;
963 data_iter = out_iter;
964 } else if (in_size > rsp_size) {
965 data_direction = DMA_FROM_DEVICE;
966 exp_data_len = in_size - rsp_size;
967
968 iov_iter_init(&in_iter, READ, &vq->iov[out], in,
969 rsp_size + exp_data_len);
970 iov_iter_advance(&in_iter, rsp_size);
971 data_iter = in_iter;
972 } else {
973 data_direction = DMA_NONE;
974 exp_data_len = 0;
975 }
976 /*
977 * If T10_PI header + payload is present, setup prot_iter values
978 * and recalculate data_iter for vhost_scsi_mapal() mapping to
979 * host scatterlists via get_user_pages_fast().
980 */
981 if (t10_pi) {
982 if (v_req_pi.pi_bytesout) {
983 if (data_direction != DMA_TO_DEVICE) {
984 vq_err(vq, "Received non zero pi_bytesout,"
985 " but wrong data_direction\n");
986 vhost_scsi_send_bad_target(vs, vq, head, out);
987 continue;
988 }
989 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout);
990 } else if (v_req_pi.pi_bytesin) {
991 if (data_direction != DMA_FROM_DEVICE) {
992 vq_err(vq, "Received non zero pi_bytesin,"
993 " but wrong data_direction\n");
994 vhost_scsi_send_bad_target(vs, vq, head, out);
995 continue;
996 }
997 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin);
998 }
999 /*
1000 * Set prot_iter to data_iter, and advance past any
1001 * preceeding prot_bytes that may be present.
1002 *
1003 * Also fix up the exp_data_len to reflect only the
1004 * actual data payload length.
1005 */
1006 if (prot_bytes) {
1007 exp_data_len -= prot_bytes;
1008 prot_iter = data_iter;
1009 iov_iter_advance(&data_iter, prot_bytes);
1010 }
1011 tag = vhost64_to_cpu(vq, v_req_pi.tag);
1012 task_attr = v_req_pi.task_attr;
1013 cdb = &v_req_pi.cdb[0];
1014 lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
1015 } else {
1016 tag = vhost64_to_cpu(vq, v_req.tag);
1017 task_attr = v_req.task_attr;
1018 cdb = &v_req.cdb[0];
1019 lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
1020 }
1021 /*
1022 * Check that the received CDB size does not exceeded our
1023 * hardcoded max for vhost-scsi, then get a pre-allocated
1024 * cmd descriptor for the new virtio-scsi tag.
1025 *
1026 * TODO what if cdb was too small for varlen cdb header?
1027 */
1028 if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) {
1029 vq_err(vq, "Received SCSI CDB with command_size: %d that"
1030 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1031 scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE);
1032 vhost_scsi_send_bad_target(vs, vq, head, out);
1033 continue;
1034 }
1035 cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr,
1036 exp_data_len + prot_bytes,
1037 data_direction);
1038 if (IS_ERR(cmd)) {
1039 vq_err(vq, "vhost_scsi_get_tag failed %ld\n",
1040 PTR_ERR(cmd));
1041 vhost_scsi_send_bad_target(vs, vq, head, out);
1042 continue;
1043 }
1044 cmd->tvc_vhost = vs;
1045 cmd->tvc_vq = vq;
1046 cmd->tvc_resp_iov = vq->iov[out];
1047 cmd->tvc_in_iovs = in;
1048
1049 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
1050 cmd->tvc_cdb[0], cmd->tvc_lun);
1051 pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:"
1052 " %d\n", cmd, exp_data_len, prot_bytes, data_direction);
1053
1054 if (data_direction != DMA_NONE) {
1055 ret = vhost_scsi_mapal(cmd,
1056 prot_bytes, &prot_iter,
1057 exp_data_len, &data_iter);
1058 if (unlikely(ret)) {
1059 vq_err(vq, "Failed to map iov to sgl\n");
1060 vhost_scsi_release_cmd(&cmd->tvc_se_cmd);
1061 vhost_scsi_send_bad_target(vs, vq, head, out);
1062 continue;
1063 }
1064 }
1065 /*
1066 * Save the descriptor from vhost_get_vq_desc() to be used to
1067 * complete the virtio-scsi request in TCM callback context via
1068 * vhost_scsi_queue_data_in() and vhost_scsi_queue_status()
1069 */
1070 cmd->tvc_vq_desc = head;
1071 /*
1072 * Dispatch cmd descriptor for cmwq execution in process
1073 * context provided by vhost_scsi_workqueue. This also ensures
1074 * cmd is executed on the same kworker CPU as this vhost
1075 * thread to gain positive L2 cache locality effects.
1076 */
1077 INIT_WORK(&cmd->work, vhost_scsi_submission_work);
1078 queue_work(vhost_scsi_workqueue, &cmd->work);
1079 }
1080out:
1081 mutex_unlock(&vq->mutex);
1082}
1083
1084static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
1085{
1086 pr_debug("%s: The handling func for control queue.\n", __func__);
1087}
1088
1089static void
1090vhost_scsi_send_evt(struct vhost_scsi *vs,
1091 struct vhost_scsi_tpg *tpg,
1092 struct se_lun *lun,
1093 u32 event,
1094 u32 reason)
1095{
1096 struct vhost_scsi_evt *evt;
1097
1098 evt = vhost_scsi_allocate_evt(vs, event, reason);
1099 if (!evt)
1100 return;
1101
1102 if (tpg && lun) {
1103 /* TODO: share lun setup code with virtio-scsi.ko */
1104 /*
1105 * Note: evt->event is zeroed when we allocate it and
1106 * lun[4-7] need to be zero according to virtio-scsi spec.
1107 */
1108 evt->event.lun[0] = 0x01;
1109 evt->event.lun[1] = tpg->tport_tpgt;
1110 if (lun->unpacked_lun >= 256)
1111 evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
1112 evt->event.lun[3] = lun->unpacked_lun & 0xFF;
1113 }
1114
1115 llist_add(&evt->list, &vs->vs_event_list);
1116 vhost_work_queue(&vs->dev, &vs->vs_event_work);
1117}
1118
1119static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
1120{
1121 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1122 poll.work);
1123 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1124
1125 mutex_lock(&vq->mutex);
1126 if (!vq->private_data)
1127 goto out;
1128
1129 if (vs->vs_events_missed)
1130 vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
1131out:
1132 mutex_unlock(&vq->mutex);
1133}
1134
1135static void vhost_scsi_handle_kick(struct vhost_work *work)
1136{
1137 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1138 poll.work);
1139 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1140
1141 vhost_scsi_handle_vq(vs, vq);
1142}
1143
1144static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
1145{
1146 vhost_poll_flush(&vs->vqs[index].vq.poll);
1147}
1148
1149/* Callers must hold dev mutex */
1150static void vhost_scsi_flush(struct vhost_scsi *vs)
1151{
1152 struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];
1153 int i;
1154
1155 /* Init new inflight and remember the old inflight */
1156 vhost_scsi_init_inflight(vs, old_inflight);
1157
1158 /*
1159 * The inflight->kref was initialized to 1. We decrement it here to
1160 * indicate the start of the flush operation so that it will reach 0
1161 * when all the reqs are finished.
1162 */
1163 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1164 kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight);
1165
1166 /* Flush both the vhost poll and vhost work */
1167 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1168 vhost_scsi_flush_vq(vs, i);
1169 vhost_work_flush(&vs->dev, &vs->vs_completion_work);
1170 vhost_work_flush(&vs->dev, &vs->vs_event_work);
1171
1172 /* Wait for all reqs issued before the flush to be finished */
1173 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1174 wait_for_completion(&old_inflight[i]->comp);
1175}
1176
1177/*
1178 * Called from vhost_scsi_ioctl() context to walk the list of available
1179 * vhost_scsi_tpg with an active struct vhost_scsi_nexus
1180 *
1181 * The lock nesting rule is:
1182 * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
1183 */
1184static int
1185vhost_scsi_set_endpoint(struct vhost_scsi *vs,
1186 struct vhost_scsi_target *t)
1187{
1188 struct se_portal_group *se_tpg;
1189 struct vhost_scsi_tport *tv_tport;
1190 struct vhost_scsi_tpg *tpg;
1191 struct vhost_scsi_tpg **vs_tpg;
1192 struct vhost_virtqueue *vq;
1193 int index, ret, i, len;
1194 bool match = false;
1195
1196 mutex_lock(&vhost_scsi_mutex);
1197 mutex_lock(&vs->dev.mutex);
1198
1199 /* Verify that ring has been setup correctly. */
1200 for (index = 0; index < vs->dev.nvqs; ++index) {
1201 /* Verify that ring has been setup correctly. */
1202 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1203 ret = -EFAULT;
1204 goto out;
1205 }
1206 }
1207
1208 len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
1209 vs_tpg = kzalloc(len, GFP_KERNEL);
1210 if (!vs_tpg) {
1211 ret = -ENOMEM;
1212 goto out;
1213 }
1214 if (vs->vs_tpg)
1215 memcpy(vs_tpg, vs->vs_tpg, len);
1216
1217 list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) {
1218 mutex_lock(&tpg->tv_tpg_mutex);
1219 if (!tpg->tpg_nexus) {
1220 mutex_unlock(&tpg->tv_tpg_mutex);
1221 continue;
1222 }
1223 if (tpg->tv_tpg_vhost_count != 0) {
1224 mutex_unlock(&tpg->tv_tpg_mutex);
1225 continue;
1226 }
1227 tv_tport = tpg->tport;
1228
1229 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1230 if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
1231 kfree(vs_tpg);
1232 mutex_unlock(&tpg->tv_tpg_mutex);
1233 ret = -EEXIST;
1234 goto out;
1235 }
1236 /*
1237 * In order to ensure individual vhost-scsi configfs
1238 * groups cannot be removed while in use by vhost ioctl,
1239 * go ahead and take an explicit se_tpg->tpg_group.cg_item
1240 * dependency now.
1241 */
1242 se_tpg = &tpg->se_tpg;
1243 ret = target_depend_item(&se_tpg->tpg_group.cg_item);
1244 if (ret) {
1245 pr_warn("configfs_depend_item() failed: %d\n", ret);
1246 kfree(vs_tpg);
1247 mutex_unlock(&tpg->tv_tpg_mutex);
1248 goto out;
1249 }
1250 tpg->tv_tpg_vhost_count++;
1251 tpg->vhost_scsi = vs;
1252 vs_tpg[tpg->tport_tpgt] = tpg;
1253 smp_mb__after_atomic();
1254 match = true;
1255 }
1256 mutex_unlock(&tpg->tv_tpg_mutex);
1257 }
1258
1259 if (match) {
1260 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1261 sizeof(vs->vs_vhost_wwpn));
1262 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1263 vq = &vs->vqs[i].vq;
1264 mutex_lock(&vq->mutex);
1265 vq->private_data = vs_tpg;
1266 vhost_vq_init_access(vq);
1267 mutex_unlock(&vq->mutex);
1268 }
1269 ret = 0;
1270 } else {
1271 ret = -EEXIST;
1272 }
1273
1274 /*
1275 * Act as synchronize_rcu to make sure access to
1276 * old vs->vs_tpg is finished.
1277 */
1278 vhost_scsi_flush(vs);
1279 kfree(vs->vs_tpg);
1280 vs->vs_tpg = vs_tpg;
1281
1282out:
1283 mutex_unlock(&vs->dev.mutex);
1284 mutex_unlock(&vhost_scsi_mutex);
1285 return ret;
1286}
1287
1288static int
1289vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
1290 struct vhost_scsi_target *t)
1291{
1292 struct se_portal_group *se_tpg;
1293 struct vhost_scsi_tport *tv_tport;
1294 struct vhost_scsi_tpg *tpg;
1295 struct vhost_virtqueue *vq;
1296 bool match = false;
1297 int index, ret, i;
1298 u8 target;
1299
1300 mutex_lock(&vhost_scsi_mutex);
1301 mutex_lock(&vs->dev.mutex);
1302 /* Verify that ring has been setup correctly. */
1303 for (index = 0; index < vs->dev.nvqs; ++index) {
1304 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1305 ret = -EFAULT;
1306 goto err_dev;
1307 }
1308 }
1309
1310 if (!vs->vs_tpg) {
1311 ret = 0;
1312 goto err_dev;
1313 }
1314
1315 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1316 target = i;
1317 tpg = vs->vs_tpg[target];
1318 if (!tpg)
1319 continue;
1320
1321 mutex_lock(&tpg->tv_tpg_mutex);
1322 tv_tport = tpg->tport;
1323 if (!tv_tport) {
1324 ret = -ENODEV;
1325 goto err_tpg;
1326 }
1327
1328 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1329 pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
1330 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
1331 tv_tport->tport_name, tpg->tport_tpgt,
1332 t->vhost_wwpn, t->vhost_tpgt);
1333 ret = -EINVAL;
1334 goto err_tpg;
1335 }
1336 tpg->tv_tpg_vhost_count--;
1337 tpg->vhost_scsi = NULL;
1338 vs->vs_tpg[target] = NULL;
1339 match = true;
1340 mutex_unlock(&tpg->tv_tpg_mutex);
1341 /*
1342 * Release se_tpg->tpg_group.cg_item configfs dependency now
1343 * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur.
1344 */
1345 se_tpg = &tpg->se_tpg;
1346 target_undepend_item(&se_tpg->tpg_group.cg_item);
1347 }
1348 if (match) {
1349 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1350 vq = &vs->vqs[i].vq;
1351 mutex_lock(&vq->mutex);
1352 vq->private_data = NULL;
1353 mutex_unlock(&vq->mutex);
1354 }
1355 }
1356 /*
1357 * Act as synchronize_rcu to make sure access to
1358 * old vs->vs_tpg is finished.
1359 */
1360 vhost_scsi_flush(vs);
1361 kfree(vs->vs_tpg);
1362 vs->vs_tpg = NULL;
1363 WARN_ON(vs->vs_events_nr);
1364 mutex_unlock(&vs->dev.mutex);
1365 mutex_unlock(&vhost_scsi_mutex);
1366 return 0;
1367
1368err_tpg:
1369 mutex_unlock(&tpg->tv_tpg_mutex);
1370err_dev:
1371 mutex_unlock(&vs->dev.mutex);
1372 mutex_unlock(&vhost_scsi_mutex);
1373 return ret;
1374}
1375
1376static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1377{
1378 struct vhost_virtqueue *vq;
1379 int i;
1380
1381 if (features & ~VHOST_SCSI_FEATURES)
1382 return -EOPNOTSUPP;
1383
1384 mutex_lock(&vs->dev.mutex);
1385 if ((features & (1 << VHOST_F_LOG_ALL)) &&
1386 !vhost_log_access_ok(&vs->dev)) {
1387 mutex_unlock(&vs->dev.mutex);
1388 return -EFAULT;
1389 }
1390
1391 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1392 vq = &vs->vqs[i].vq;
1393 mutex_lock(&vq->mutex);
1394 vq->acked_features = features;
1395 mutex_unlock(&vq->mutex);
1396 }
1397 mutex_unlock(&vs->dev.mutex);
1398 return 0;
1399}
1400
1401static int vhost_scsi_open(struct inode *inode, struct file *f)
1402{
1403 struct vhost_scsi *vs;
1404 struct vhost_virtqueue **vqs;
1405 int r = -ENOMEM, i;
1406
1407 vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
1408 if (!vs) {
1409 vs = vzalloc(sizeof(*vs));
1410 if (!vs)
1411 goto err_vs;
1412 }
1413
1414 vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL);
1415 if (!vqs)
1416 goto err_vqs;
1417
1418 vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);
1419 vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);
1420
1421 vs->vs_events_nr = 0;
1422 vs->vs_events_missed = false;
1423
1424 vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
1425 vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1426 vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1427 vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
1428 for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
1429 vqs[i] = &vs->vqs[i].vq;
1430 vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
1431 }
1432 vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ);
1433
1434 vhost_scsi_init_inflight(vs, NULL);
1435
1436 f->private_data = vs;
1437 return 0;
1438
1439err_vqs:
1440 kvfree(vs);
1441err_vs:
1442 return r;
1443}
1444
1445static int vhost_scsi_release(struct inode *inode, struct file *f)
1446{
1447 struct vhost_scsi *vs = f->private_data;
1448 struct vhost_scsi_target t;
1449
1450 mutex_lock(&vs->dev.mutex);
1451 memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
1452 mutex_unlock(&vs->dev.mutex);
1453 vhost_scsi_clear_endpoint(vs, &t);
1454 vhost_dev_stop(&vs->dev);
1455 vhost_dev_cleanup(&vs->dev, false);
1456 /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
1457 vhost_scsi_flush(vs);
1458 kfree(vs->dev.vqs);
1459 kvfree(vs);
1460 return 0;
1461}
1462
1463static long
1464vhost_scsi_ioctl(struct file *f,
1465 unsigned int ioctl,
1466 unsigned long arg)
1467{
1468 struct vhost_scsi *vs = f->private_data;
1469 struct vhost_scsi_target backend;
1470 void __user *argp = (void __user *)arg;
1471 u64 __user *featurep = argp;
1472 u32 __user *eventsp = argp;
1473 u32 events_missed;
1474 u64 features;
1475 int r, abi_version = VHOST_SCSI_ABI_VERSION;
1476 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1477
1478 switch (ioctl) {
1479 case VHOST_SCSI_SET_ENDPOINT:
1480 if (copy_from_user(&backend, argp, sizeof backend))
1481 return -EFAULT;
1482 if (backend.reserved != 0)
1483 return -EOPNOTSUPP;
1484
1485 return vhost_scsi_set_endpoint(vs, &backend);
1486 case VHOST_SCSI_CLEAR_ENDPOINT:
1487 if (copy_from_user(&backend, argp, sizeof backend))
1488 return -EFAULT;
1489 if (backend.reserved != 0)
1490 return -EOPNOTSUPP;
1491
1492 return vhost_scsi_clear_endpoint(vs, &backend);
1493 case VHOST_SCSI_GET_ABI_VERSION:
1494 if (copy_to_user(argp, &abi_version, sizeof abi_version))
1495 return -EFAULT;
1496 return 0;
1497 case VHOST_SCSI_SET_EVENTS_MISSED:
1498 if (get_user(events_missed, eventsp))
1499 return -EFAULT;
1500 mutex_lock(&vq->mutex);
1501 vs->vs_events_missed = events_missed;
1502 mutex_unlock(&vq->mutex);
1503 return 0;
1504 case VHOST_SCSI_GET_EVENTS_MISSED:
1505 mutex_lock(&vq->mutex);
1506 events_missed = vs->vs_events_missed;
1507 mutex_unlock(&vq->mutex);
1508 if (put_user(events_missed, eventsp))
1509 return -EFAULT;
1510 return 0;
1511 case VHOST_GET_FEATURES:
1512 features = VHOST_SCSI_FEATURES;
1513 if (copy_to_user(featurep, &features, sizeof features))
1514 return -EFAULT;
1515 return 0;
1516 case VHOST_SET_FEATURES:
1517 if (copy_from_user(&features, featurep, sizeof features))
1518 return -EFAULT;
1519 return vhost_scsi_set_features(vs, features);
1520 default:
1521 mutex_lock(&vs->dev.mutex);
1522 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
1523 /* TODO: flush backend after dev ioctl. */
1524 if (r == -ENOIOCTLCMD)
1525 r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
1526 mutex_unlock(&vs->dev.mutex);
1527 return r;
1528 }
1529}
1530
1531#ifdef CONFIG_COMPAT
1532static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
1533 unsigned long arg)
1534{
1535 return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
1536}
1537#endif
1538
1539static const struct file_operations vhost_scsi_fops = {
1540 .owner = THIS_MODULE,
1541 .release = vhost_scsi_release,
1542 .unlocked_ioctl = vhost_scsi_ioctl,
1543#ifdef CONFIG_COMPAT
1544 .compat_ioctl = vhost_scsi_compat_ioctl,
1545#endif
1546 .open = vhost_scsi_open,
1547 .llseek = noop_llseek,
1548};
1549
1550static struct miscdevice vhost_scsi_misc = {
1551 MISC_DYNAMIC_MINOR,
1552 "vhost-scsi",
1553 &vhost_scsi_fops,
1554};
1555
1556static int __init vhost_scsi_register(void)
1557{
1558 return misc_register(&vhost_scsi_misc);
1559}
1560
1561static void vhost_scsi_deregister(void)
1562{
1563 misc_deregister(&vhost_scsi_misc);
1564}
1565
1566static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport)
1567{
1568 switch (tport->tport_proto_id) {
1569 case SCSI_PROTOCOL_SAS:
1570 return "SAS";
1571 case SCSI_PROTOCOL_FCP:
1572 return "FCP";
1573 case SCSI_PROTOCOL_ISCSI:
1574 return "iSCSI";
1575 default:
1576 break;
1577 }
1578
1579 return "Unknown";
1580}
1581
1582static void
1583vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg,
1584 struct se_lun *lun, bool plug)
1585{
1586
1587 struct vhost_scsi *vs = tpg->vhost_scsi;
1588 struct vhost_virtqueue *vq;
1589 u32 reason;
1590
1591 if (!vs)
1592 return;
1593
1594 mutex_lock(&vs->dev.mutex);
1595
1596 if (plug)
1597 reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
1598 else
1599 reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
1600
1601 vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1602 mutex_lock(&vq->mutex);
1603 if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG))
1604 vhost_scsi_send_evt(vs, tpg, lun,
1605 VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
1606 mutex_unlock(&vq->mutex);
1607 mutex_unlock(&vs->dev.mutex);
1608}
1609
1610static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1611{
1612 vhost_scsi_do_plug(tpg, lun, true);
1613}
1614
1615static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1616{
1617 vhost_scsi_do_plug(tpg, lun, false);
1618}
1619
1620static int vhost_scsi_port_link(struct se_portal_group *se_tpg,
1621 struct se_lun *lun)
1622{
1623 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1624 struct vhost_scsi_tpg, se_tpg);
1625
1626 mutex_lock(&vhost_scsi_mutex);
1627
1628 mutex_lock(&tpg->tv_tpg_mutex);
1629 tpg->tv_tpg_port_count++;
1630 mutex_unlock(&tpg->tv_tpg_mutex);
1631
1632 vhost_scsi_hotplug(tpg, lun);
1633
1634 mutex_unlock(&vhost_scsi_mutex);
1635
1636 return 0;
1637}
1638
1639static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
1640 struct se_lun *lun)
1641{
1642 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1643 struct vhost_scsi_tpg, se_tpg);
1644
1645 mutex_lock(&vhost_scsi_mutex);
1646
1647 mutex_lock(&tpg->tv_tpg_mutex);
1648 tpg->tv_tpg_port_count--;
1649 mutex_unlock(&tpg->tv_tpg_mutex);
1650
1651 vhost_scsi_hotunplug(tpg, lun);
1652
1653 mutex_unlock(&vhost_scsi_mutex);
1654}
1655
1656static void vhost_scsi_free_cmd_map_res(struct se_session *se_sess)
1657{
1658 struct vhost_scsi_cmd *tv_cmd;
1659 unsigned int i;
1660
1661 if (!se_sess->sess_cmd_map)
1662 return;
1663
1664 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1665 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1666
1667 kfree(tv_cmd->tvc_sgl);
1668 kfree(tv_cmd->tvc_prot_sgl);
1669 kfree(tv_cmd->tvc_upages);
1670 }
1671}
1672
1673static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store(
1674 struct config_item *item, const char *page, size_t count)
1675{
1676 struct se_portal_group *se_tpg = attrib_to_tpg(item);
1677 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1678 struct vhost_scsi_tpg, se_tpg);
1679 unsigned long val;
1680 int ret = kstrtoul(page, 0, &val);
1681
1682 if (ret) {
1683 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
1684 return ret;
1685 }
1686 if (val != 0 && val != 1 && val != 3) {
1687 pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val);
1688 return -EINVAL;
1689 }
1690 tpg->tv_fabric_prot_type = val;
1691
1692 return count;
1693}
1694
1695static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show(
1696 struct config_item *item, char *page)
1697{
1698 struct se_portal_group *se_tpg = attrib_to_tpg(item);
1699 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1700 struct vhost_scsi_tpg, se_tpg);
1701
1702 return sprintf(page, "%d\n", tpg->tv_fabric_prot_type);
1703}
1704
1705CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type);
1706
1707static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = {
1708 &vhost_scsi_tpg_attrib_attr_fabric_prot_type,
1709 NULL,
1710};
1711
1712static int vhost_scsi_nexus_cb(struct se_portal_group *se_tpg,
1713 struct se_session *se_sess, void *p)
1714{
1715 struct vhost_scsi_cmd *tv_cmd;
1716 unsigned int i;
1717
1718 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1719 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1720
1721 tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) *
1722 VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL);
1723 if (!tv_cmd->tvc_sgl) {
1724 pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
1725 goto out;
1726 }
1727
1728 tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) *
1729 VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL);
1730 if (!tv_cmd->tvc_upages) {
1731 pr_err("Unable to allocate tv_cmd->tvc_upages\n");
1732 goto out;
1733 }
1734
1735 tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) *
1736 VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL);
1737 if (!tv_cmd->tvc_prot_sgl) {
1738 pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
1739 goto out;
1740 }
1741 }
1742 return 0;
1743out:
1744 vhost_scsi_free_cmd_map_res(se_sess);
1745 return -ENOMEM;
1746}
1747
1748static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
1749 const char *name)
1750{
1751 struct vhost_scsi_nexus *tv_nexus;
1752
1753 mutex_lock(&tpg->tv_tpg_mutex);
1754 if (tpg->tpg_nexus) {
1755 mutex_unlock(&tpg->tv_tpg_mutex);
1756 pr_debug("tpg->tpg_nexus already exists\n");
1757 return -EEXIST;
1758 }
1759
1760 tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL);
1761 if (!tv_nexus) {
1762 mutex_unlock(&tpg->tv_tpg_mutex);
1763 pr_err("Unable to allocate struct vhost_scsi_nexus\n");
1764 return -ENOMEM;
1765 }
1766 /*
1767 * Since we are running in 'demo mode' this call with generate a
1768 * struct se_node_acl for the vhost_scsi struct se_portal_group with
1769 * the SCSI Initiator port name of the passed configfs group 'name'.
1770 */
1771 tv_nexus->tvn_se_sess = target_alloc_session(&tpg->se_tpg,
1772 VHOST_SCSI_DEFAULT_TAGS,
1773 sizeof(struct vhost_scsi_cmd),
1774 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
1775 (unsigned char *)name, tv_nexus,
1776 vhost_scsi_nexus_cb);
1777 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1778 mutex_unlock(&tpg->tv_tpg_mutex);
1779 kfree(tv_nexus);
1780 return -ENOMEM;
1781 }
1782 tpg->tpg_nexus = tv_nexus;
1783
1784 mutex_unlock(&tpg->tv_tpg_mutex);
1785 return 0;
1786}
1787
1788static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
1789{
1790 struct se_session *se_sess;
1791 struct vhost_scsi_nexus *tv_nexus;
1792
1793 mutex_lock(&tpg->tv_tpg_mutex);
1794 tv_nexus = tpg->tpg_nexus;
1795 if (!tv_nexus) {
1796 mutex_unlock(&tpg->tv_tpg_mutex);
1797 return -ENODEV;
1798 }
1799
1800 se_sess = tv_nexus->tvn_se_sess;
1801 if (!se_sess) {
1802 mutex_unlock(&tpg->tv_tpg_mutex);
1803 return -ENODEV;
1804 }
1805
1806 if (tpg->tv_tpg_port_count != 0) {
1807 mutex_unlock(&tpg->tv_tpg_mutex);
1808 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1809 " active TPG port count: %d\n",
1810 tpg->tv_tpg_port_count);
1811 return -EBUSY;
1812 }
1813
1814 if (tpg->tv_tpg_vhost_count != 0) {
1815 mutex_unlock(&tpg->tv_tpg_mutex);
1816 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1817 " active TPG vhost count: %d\n",
1818 tpg->tv_tpg_vhost_count);
1819 return -EBUSY;
1820 }
1821
1822 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
1823 " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport),
1824 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1825
1826 vhost_scsi_free_cmd_map_res(se_sess);
1827 /*
1828 * Release the SCSI I_T Nexus to the emulated vhost Target Port
1829 */
1830 transport_deregister_session(tv_nexus->tvn_se_sess);
1831 tpg->tpg_nexus = NULL;
1832 mutex_unlock(&tpg->tv_tpg_mutex);
1833
1834 kfree(tv_nexus);
1835 return 0;
1836}
1837
1838static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page)
1839{
1840 struct se_portal_group *se_tpg = to_tpg(item);
1841 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1842 struct vhost_scsi_tpg, se_tpg);
1843 struct vhost_scsi_nexus *tv_nexus;
1844 ssize_t ret;
1845
1846 mutex_lock(&tpg->tv_tpg_mutex);
1847 tv_nexus = tpg->tpg_nexus;
1848 if (!tv_nexus) {
1849 mutex_unlock(&tpg->tv_tpg_mutex);
1850 return -ENODEV;
1851 }
1852 ret = snprintf(page, PAGE_SIZE, "%s\n",
1853 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1854 mutex_unlock(&tpg->tv_tpg_mutex);
1855
1856 return ret;
1857}
1858
1859static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item,
1860 const char *page, size_t count)
1861{
1862 struct se_portal_group *se_tpg = to_tpg(item);
1863 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1864 struct vhost_scsi_tpg, se_tpg);
1865 struct vhost_scsi_tport *tport_wwn = tpg->tport;
1866 unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr;
1867 int ret;
1868 /*
1869 * Shutdown the active I_T nexus if 'NULL' is passed..
1870 */
1871 if (!strncmp(page, "NULL", 4)) {
1872 ret = vhost_scsi_drop_nexus(tpg);
1873 return (!ret) ? count : ret;
1874 }
1875 /*
1876 * Otherwise make sure the passed virtual Initiator port WWN matches
1877 * the fabric protocol_id set in vhost_scsi_make_tport(), and call
1878 * vhost_scsi_make_nexus().
1879 */
1880 if (strlen(page) >= VHOST_SCSI_NAMELEN) {
1881 pr_err("Emulated NAA Sas Address: %s, exceeds"
1882 " max: %d\n", page, VHOST_SCSI_NAMELEN);
1883 return -EINVAL;
1884 }
1885 snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page);
1886
1887 ptr = strstr(i_port, "naa.");
1888 if (ptr) {
1889 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1890 pr_err("Passed SAS Initiator Port %s does not"
1891 " match target port protoid: %s\n", i_port,
1892 vhost_scsi_dump_proto_id(tport_wwn));
1893 return -EINVAL;
1894 }
1895 port_ptr = &i_port[0];
1896 goto check_newline;
1897 }
1898 ptr = strstr(i_port, "fc.");
1899 if (ptr) {
1900 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1901 pr_err("Passed FCP Initiator Port %s does not"
1902 " match target port protoid: %s\n", i_port,
1903 vhost_scsi_dump_proto_id(tport_wwn));
1904 return -EINVAL;
1905 }
1906 port_ptr = &i_port[3]; /* Skip over "fc." */
1907 goto check_newline;
1908 }
1909 ptr = strstr(i_port, "iqn.");
1910 if (ptr) {
1911 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1912 pr_err("Passed iSCSI Initiator Port %s does not"
1913 " match target port protoid: %s\n", i_port,
1914 vhost_scsi_dump_proto_id(tport_wwn));
1915 return -EINVAL;
1916 }
1917 port_ptr = &i_port[0];
1918 goto check_newline;
1919 }
1920 pr_err("Unable to locate prefix for emulated Initiator Port:"
1921 " %s\n", i_port);
1922 return -EINVAL;
1923 /*
1924 * Clear any trailing newline for the NAA WWN
1925 */
1926check_newline:
1927 if (i_port[strlen(i_port)-1] == '\n')
1928 i_port[strlen(i_port)-1] = '\0';
1929
1930 ret = vhost_scsi_make_nexus(tpg, port_ptr);
1931 if (ret < 0)
1932 return ret;
1933
1934 return count;
1935}
1936
1937CONFIGFS_ATTR(vhost_scsi_tpg_, nexus);
1938
1939static struct configfs_attribute *vhost_scsi_tpg_attrs[] = {
1940 &vhost_scsi_tpg_attr_nexus,
1941 NULL,
1942};
1943
1944static struct se_portal_group *
1945vhost_scsi_make_tpg(struct se_wwn *wwn,
1946 struct config_group *group,
1947 const char *name)
1948{
1949 struct vhost_scsi_tport *tport = container_of(wwn,
1950 struct vhost_scsi_tport, tport_wwn);
1951
1952 struct vhost_scsi_tpg *tpg;
1953 u16 tpgt;
1954 int ret;
1955
1956 if (strstr(name, "tpgt_") != name)
1957 return ERR_PTR(-EINVAL);
1958 if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET)
1959 return ERR_PTR(-EINVAL);
1960
1961 tpg = kzalloc(sizeof(struct vhost_scsi_tpg), GFP_KERNEL);
1962 if (!tpg) {
1963 pr_err("Unable to allocate struct vhost_scsi_tpg");
1964 return ERR_PTR(-ENOMEM);
1965 }
1966 mutex_init(&tpg->tv_tpg_mutex);
1967 INIT_LIST_HEAD(&tpg->tv_tpg_list);
1968 tpg->tport = tport;
1969 tpg->tport_tpgt = tpgt;
1970
1971 ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id);
1972 if (ret < 0) {
1973 kfree(tpg);
1974 return NULL;
1975 }
1976 mutex_lock(&vhost_scsi_mutex);
1977 list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list);
1978 mutex_unlock(&vhost_scsi_mutex);
1979
1980 return &tpg->se_tpg;
1981}
1982
1983static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg)
1984{
1985 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1986 struct vhost_scsi_tpg, se_tpg);
1987
1988 mutex_lock(&vhost_scsi_mutex);
1989 list_del(&tpg->tv_tpg_list);
1990 mutex_unlock(&vhost_scsi_mutex);
1991 /*
1992 * Release the virtual I_T Nexus for this vhost TPG
1993 */
1994 vhost_scsi_drop_nexus(tpg);
1995 /*
1996 * Deregister the se_tpg from TCM..
1997 */
1998 core_tpg_deregister(se_tpg);
1999 kfree(tpg);
2000}
2001
2002static struct se_wwn *
2003vhost_scsi_make_tport(struct target_fabric_configfs *tf,
2004 struct config_group *group,
2005 const char *name)
2006{
2007 struct vhost_scsi_tport *tport;
2008 char *ptr;
2009 u64 wwpn = 0;
2010 int off = 0;
2011
2012 /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
2013 return ERR_PTR(-EINVAL); */
2014
2015 tport = kzalloc(sizeof(struct vhost_scsi_tport), GFP_KERNEL);
2016 if (!tport) {
2017 pr_err("Unable to allocate struct vhost_scsi_tport");
2018 return ERR_PTR(-ENOMEM);
2019 }
2020 tport->tport_wwpn = wwpn;
2021 /*
2022 * Determine the emulated Protocol Identifier and Target Port Name
2023 * based on the incoming configfs directory name.
2024 */
2025 ptr = strstr(name, "naa.");
2026 if (ptr) {
2027 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
2028 goto check_len;
2029 }
2030 ptr = strstr(name, "fc.");
2031 if (ptr) {
2032 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
2033 off = 3; /* Skip over "fc." */
2034 goto check_len;
2035 }
2036 ptr = strstr(name, "iqn.");
2037 if (ptr) {
2038 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
2039 goto check_len;
2040 }
2041
2042 pr_err("Unable to locate prefix for emulated Target Port:"
2043 " %s\n", name);
2044 kfree(tport);
2045 return ERR_PTR(-EINVAL);
2046
2047check_len:
2048 if (strlen(name) >= VHOST_SCSI_NAMELEN) {
2049 pr_err("Emulated %s Address: %s, exceeds"
2050 " max: %d\n", name, vhost_scsi_dump_proto_id(tport),
2051 VHOST_SCSI_NAMELEN);
2052 kfree(tport);
2053 return ERR_PTR(-EINVAL);
2054 }
2055 snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]);
2056
2057 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
2058 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name);
2059
2060 return &tport->tport_wwn;
2061}
2062
2063static void vhost_scsi_drop_tport(struct se_wwn *wwn)
2064{
2065 struct vhost_scsi_tport *tport = container_of(wwn,
2066 struct vhost_scsi_tport, tport_wwn);
2067
2068 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
2069 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport),
2070 tport->tport_name);
2071
2072 kfree(tport);
2073}
2074
2075static ssize_t
2076vhost_scsi_wwn_version_show(struct config_item *item, char *page)
2077{
2078 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
2079 "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2080 utsname()->machine);
2081}
2082
2083CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version);
2084
2085static struct configfs_attribute *vhost_scsi_wwn_attrs[] = {
2086 &vhost_scsi_wwn_attr_version,
2087 NULL,
2088};
2089
2090static const struct target_core_fabric_ops vhost_scsi_ops = {
2091 .module = THIS_MODULE,
2092 .name = "vhost",
2093 .get_fabric_name = vhost_scsi_get_fabric_name,
2094 .tpg_get_wwn = vhost_scsi_get_fabric_wwn,
2095 .tpg_get_tag = vhost_scsi_get_tpgt,
2096 .tpg_check_demo_mode = vhost_scsi_check_true,
2097 .tpg_check_demo_mode_cache = vhost_scsi_check_true,
2098 .tpg_check_demo_mode_write_protect = vhost_scsi_check_false,
2099 .tpg_check_prod_mode_write_protect = vhost_scsi_check_false,
2100 .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only,
2101 .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index,
2102 .release_cmd = vhost_scsi_release_cmd,
2103 .check_stop_free = vhost_scsi_check_stop_free,
2104 .sess_get_index = vhost_scsi_sess_get_index,
2105 .sess_get_initiator_sid = NULL,
2106 .write_pending = vhost_scsi_write_pending,
2107 .write_pending_status = vhost_scsi_write_pending_status,
2108 .set_default_node_attributes = vhost_scsi_set_default_node_attrs,
2109 .get_cmd_state = vhost_scsi_get_cmd_state,
2110 .queue_data_in = vhost_scsi_queue_data_in,
2111 .queue_status = vhost_scsi_queue_status,
2112 .queue_tm_rsp = vhost_scsi_queue_tm_rsp,
2113 .aborted_task = vhost_scsi_aborted_task,
2114 /*
2115 * Setup callers for generic logic in target_core_fabric_configfs.c
2116 */
2117 .fabric_make_wwn = vhost_scsi_make_tport,
2118 .fabric_drop_wwn = vhost_scsi_drop_tport,
2119 .fabric_make_tpg = vhost_scsi_make_tpg,
2120 .fabric_drop_tpg = vhost_scsi_drop_tpg,
2121 .fabric_post_link = vhost_scsi_port_link,
2122 .fabric_pre_unlink = vhost_scsi_port_unlink,
2123
2124 .tfc_wwn_attrs = vhost_scsi_wwn_attrs,
2125 .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs,
2126 .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs,
2127};
2128
2129static int __init vhost_scsi_init(void)
2130{
2131 int ret = -ENOMEM;
2132
2133 pr_debug("TCM_VHOST fabric module %s on %s/%s"
2134 " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2135 utsname()->machine);
2136
2137 /*
2138 * Use our own dedicated workqueue for submitting I/O into
2139 * target core to avoid contention within system_wq.
2140 */
2141 vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0);
2142 if (!vhost_scsi_workqueue)
2143 goto out;
2144
2145 ret = vhost_scsi_register();
2146 if (ret < 0)
2147 goto out_destroy_workqueue;
2148
2149 ret = target_register_template(&vhost_scsi_ops);
2150 if (ret < 0)
2151 goto out_vhost_scsi_deregister;
2152
2153 return 0;
2154
2155out_vhost_scsi_deregister:
2156 vhost_scsi_deregister();
2157out_destroy_workqueue:
2158 destroy_workqueue(vhost_scsi_workqueue);
2159out:
2160 return ret;
2161};
2162
2163static void vhost_scsi_exit(void)
2164{
2165 target_unregister_template(&vhost_scsi_ops);
2166 vhost_scsi_deregister();
2167 destroy_workqueue(vhost_scsi_workqueue);
2168};
2169
2170MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2171MODULE_ALIAS("tcm_vhost");
2172MODULE_LICENSE("GPL");
2173module_init(vhost_scsi_init);
2174module_exit(vhost_scsi_exit);