blob: 99d3480450e7377786e50200a2e8cc4e59c3ef30 [file] [log] [blame]
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001/*******************************************************************************
2 * Vhost kernel TCM fabric driver for virtio SCSI initiators
3 *
4 * (C) Copyright 2010-2012 RisingTide Systems LLC.
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@risingtidesystems.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>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070037#include <linux/fs.h>
38#include <linux/miscdevice.h>
39#include <asm/unaligned.h>
40#include <scsi/scsi.h>
41#include <scsi/scsi_tcq.h>
42#include <target/target_core_base.h>
43#include <target/target_core_fabric.h>
44#include <target/target_core_fabric_configfs.h>
45#include <target/target_core_configfs.h>
46#include <target/configfs_macros.h>
47#include <linux/vhost.h>
48#include <linux/virtio_net.h> /* TODO vhost.h currently depends on this */
49#include <linux/virtio_scsi.h>
Asias He9d6064a2013-01-06 14:36:13 +080050#include <linux/llist.h>
Asias He1b7f3902013-02-06 13:20:59 +080051#include <linux/bitmap.h>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070052
53#include "vhost.c"
54#include "vhost.h"
55#include "tcm_vhost.h"
56
Nicholas Bellinger101998f2012-07-30 13:30:00 -070057enum {
58 VHOST_SCSI_VQ_CTL = 0,
59 VHOST_SCSI_VQ_EVT = 1,
60 VHOST_SCSI_VQ_IO = 2,
61};
62
Nicholas Bellinger5dade712013-03-27 17:23:41 -070063/*
64 * VIRTIO_RING_F_EVENT_IDX seems broken. Not sure the bug is in
65 * kernel but disabling it helps.
66 * TODO: debug and remove the workaround.
67 */
68enum {
Asias He04b59ba2013-04-25 15:35:23 +080069 VHOST_SCSI_FEATURES = (VHOST_FEATURES & (~VIRTIO_RING_F_EVENT_IDX)) |
70 (1ULL << VIRTIO_SCSI_F_HOTPLUG)
Nicholas Bellinger5dade712013-03-27 17:23:41 -070071};
72
Asias He1b7f3902013-02-06 13:20:59 +080073#define VHOST_SCSI_MAX_TARGET 256
74#define VHOST_SCSI_MAX_VQ 128
Asias Hea6c9af82013-04-25 15:35:21 +080075#define VHOST_SCSI_MAX_EVENT 128
Asias He67e18cf2013-02-05 12:31:57 +080076
Asias He3ab2e422013-04-27 11:16:48 +080077struct vhost_scsi_virtqueue {
78 struct vhost_virtqueue vq;
79};
80
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070081struct vhost_scsi {
Asias He67e18cf2013-02-05 12:31:57 +080082 /* Protected by vhost_scsi->dev.mutex */
Asias He4f7f46d2013-04-03 14:17:37 +080083 struct tcm_vhost_tpg **vs_tpg;
Asias He67e18cf2013-02-05 12:31:57 +080084 char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
Asias He67e18cf2013-02-05 12:31:57 +080085
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070086 struct vhost_dev dev;
Asias He3ab2e422013-04-27 11:16:48 +080087 struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ];
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070088
89 struct vhost_work vs_completion_work; /* cmd completion work item */
Asias He9d6064a2013-01-06 14:36:13 +080090 struct llist_head vs_completion_list; /* cmd completion queue */
Asias Hea6c9af82013-04-25 15:35:21 +080091
92 struct vhost_work vs_event_work; /* evt injection work item */
93 struct llist_head vs_event_list; /* evt injection queue */
94
95 bool vs_events_missed; /* any missed events, protected by vq->mutex */
96 int vs_events_nr; /* num of pending events, protected by vq->mutex */
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070097};
98
99/* Local pointer to allocated TCM configfs fabric module */
100static struct target_fabric_configfs *tcm_vhost_fabric_configfs;
101
102static struct workqueue_struct *tcm_vhost_workqueue;
103
104/* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */
105static DEFINE_MUTEX(tcm_vhost_mutex);
106static LIST_HEAD(tcm_vhost_list);
107
Asias He765b34f2013-01-22 11:20:25 +0800108static int iov_num_pages(struct iovec *iov)
109{
110 return (PAGE_ALIGN((unsigned long)iov->iov_base + iov->iov_len) -
111 ((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT;
112}
113
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700114static int tcm_vhost_check_true(struct se_portal_group *se_tpg)
115{
116 return 1;
117}
118
119static int tcm_vhost_check_false(struct se_portal_group *se_tpg)
120{
121 return 0;
122}
123
124static char *tcm_vhost_get_fabric_name(void)
125{
126 return "vhost";
127}
128
129static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg)
130{
131 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
132 struct tcm_vhost_tpg, se_tpg);
133 struct tcm_vhost_tport *tport = tpg->tport;
134
135 switch (tport->tport_proto_id) {
136 case SCSI_PROTOCOL_SAS:
137 return sas_get_fabric_proto_ident(se_tpg);
138 case SCSI_PROTOCOL_FCP:
139 return fc_get_fabric_proto_ident(se_tpg);
140 case SCSI_PROTOCOL_ISCSI:
141 return iscsi_get_fabric_proto_ident(se_tpg);
142 default:
143 pr_err("Unknown tport_proto_id: 0x%02x, using"
144 " SAS emulation\n", tport->tport_proto_id);
145 break;
146 }
147
148 return sas_get_fabric_proto_ident(se_tpg);
149}
150
151static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg)
152{
153 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
154 struct tcm_vhost_tpg, se_tpg);
155 struct tcm_vhost_tport *tport = tpg->tport;
156
157 return &tport->tport_name[0];
158}
159
160static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg)
161{
162 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
163 struct tcm_vhost_tpg, se_tpg);
164 return tpg->tport_tpgt;
165}
166
167static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg)
168{
169 return 1;
170}
171
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700172static u32 tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700173 struct se_node_acl *se_nacl,
174 struct t10_pr_registration *pr_reg,
175 int *format_code,
176 unsigned char *buf)
177{
178 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
179 struct tcm_vhost_tpg, se_tpg);
180 struct tcm_vhost_tport *tport = tpg->tport;
181
182 switch (tport->tport_proto_id) {
183 case SCSI_PROTOCOL_SAS:
184 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
185 format_code, buf);
186 case SCSI_PROTOCOL_FCP:
187 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
188 format_code, buf);
189 case SCSI_PROTOCOL_ISCSI:
190 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
191 format_code, buf);
192 default:
193 pr_err("Unknown tport_proto_id: 0x%02x, using"
194 " SAS emulation\n", tport->tport_proto_id);
195 break;
196 }
197
198 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
199 format_code, buf);
200}
201
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700202static u32 tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700203 struct se_node_acl *se_nacl,
204 struct t10_pr_registration *pr_reg,
205 int *format_code)
206{
207 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
208 struct tcm_vhost_tpg, se_tpg);
209 struct tcm_vhost_tport *tport = tpg->tport;
210
211 switch (tport->tport_proto_id) {
212 case SCSI_PROTOCOL_SAS:
213 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
214 format_code);
215 case SCSI_PROTOCOL_FCP:
216 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
217 format_code);
218 case SCSI_PROTOCOL_ISCSI:
219 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
220 format_code);
221 default:
222 pr_err("Unknown tport_proto_id: 0x%02x, using"
223 " SAS emulation\n", tport->tport_proto_id);
224 break;
225 }
226
227 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
228 format_code);
229}
230
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700231static char *tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700232 const char *buf,
233 u32 *out_tid_len,
234 char **port_nexus_ptr)
235{
236 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
237 struct tcm_vhost_tpg, se_tpg);
238 struct tcm_vhost_tport *tport = tpg->tport;
239
240 switch (tport->tport_proto_id) {
241 case SCSI_PROTOCOL_SAS:
242 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
243 port_nexus_ptr);
244 case SCSI_PROTOCOL_FCP:
245 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
246 port_nexus_ptr);
247 case SCSI_PROTOCOL_ISCSI:
248 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
249 port_nexus_ptr);
250 default:
251 pr_err("Unknown tport_proto_id: 0x%02x, using"
252 " SAS emulation\n", tport->tport_proto_id);
253 break;
254 }
255
256 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
257 port_nexus_ptr);
258}
259
260static struct se_node_acl *tcm_vhost_alloc_fabric_acl(
261 struct se_portal_group *se_tpg)
262{
263 struct tcm_vhost_nacl *nacl;
264
265 nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL);
266 if (!nacl) {
Masanari Iida744627e92012-11-05 23:30:40 +0900267 pr_err("Unable to allocate struct tcm_vhost_nacl\n");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700268 return NULL;
269 }
270
271 return &nacl->se_node_acl;
272}
273
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700274static void tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700275 struct se_node_acl *se_nacl)
276{
277 struct tcm_vhost_nacl *nacl = container_of(se_nacl,
278 struct tcm_vhost_nacl, se_node_acl);
279 kfree(nacl);
280}
281
282static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg)
283{
284 return 1;
285}
286
287static void tcm_vhost_release_cmd(struct se_cmd *se_cmd)
288{
289 return;
290}
291
292static int tcm_vhost_shutdown_session(struct se_session *se_sess)
293{
294 return 0;
295}
296
297static void tcm_vhost_close_session(struct se_session *se_sess)
298{
299 return;
300}
301
302static u32 tcm_vhost_sess_get_index(struct se_session *se_sess)
303{
304 return 0;
305}
306
307static int tcm_vhost_write_pending(struct se_cmd *se_cmd)
308{
309 /* Go ahead and process the write immediately */
310 target_execute_cmd(se_cmd);
311 return 0;
312}
313
314static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd)
315{
316 return 0;
317}
318
319static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl)
320{
321 return;
322}
323
324static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd)
325{
326 return 0;
327}
328
329static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd)
330{
331 return 0;
332}
333
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700334static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *tv_cmd)
335{
336 struct vhost_scsi *vs = tv_cmd->tvc_vhost;
337
Asias He9d6064a2013-01-06 14:36:13 +0800338 llist_add(&tv_cmd->tvc_completion_list, &vs->vs_completion_list);
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700339
340 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
341}
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700342
343static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd)
344{
345 struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
346 struct tcm_vhost_cmd, tvc_se_cmd);
347 vhost_scsi_complete_cmd(tv_cmd);
348 return 0;
349}
350
351static int tcm_vhost_queue_status(struct se_cmd *se_cmd)
352{
353 struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
354 struct tcm_vhost_cmd, tvc_se_cmd);
355 vhost_scsi_complete_cmd(tv_cmd);
356 return 0;
357}
358
359static int tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd)
360{
361 return 0;
362}
363
Asias Hea6c9af82013-04-25 15:35:21 +0800364static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt)
365{
366 vs->vs_events_nr--;
367 kfree(evt);
368}
369
370static struct tcm_vhost_evt *tcm_vhost_allocate_evt(struct vhost_scsi *vs,
371 u32 event, u32 reason)
372{
Asias He3ab2e422013-04-27 11:16:48 +0800373 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +0800374 struct tcm_vhost_evt *evt;
375
376 if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
377 vs->vs_events_missed = true;
378 return NULL;
379 }
380
381 evt = kzalloc(sizeof(*evt), GFP_KERNEL);
382 if (!evt) {
383 vq_err(vq, "Failed to allocate tcm_vhost_evt\n");
384 vs->vs_events_missed = true;
385 return NULL;
386 }
387
388 evt->event.event = event;
389 evt->event.reason = reason;
390 vs->vs_events_nr++;
391
392 return evt;
393}
394
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700395static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd)
396{
397 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
398
399 /* TODO locking against target/backend threads? */
400 transport_generic_free_cmd(se_cmd, 1);
401
402 if (tv_cmd->tvc_sgl_count) {
403 u32 i;
404 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
405 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
406
407 kfree(tv_cmd->tvc_sgl);
408 }
409
410 kfree(tv_cmd);
411}
412
Asias Hea6c9af82013-04-25 15:35:21 +0800413static void tcm_vhost_do_evt_work(struct vhost_scsi *vs,
414 struct tcm_vhost_evt *evt)
415{
Asias He3ab2e422013-04-27 11:16:48 +0800416 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +0800417 struct virtio_scsi_event *event = &evt->event;
418 struct virtio_scsi_event __user *eventp;
419 unsigned out, in;
420 int head, ret;
421
422 if (!vq->private_data) {
423 vs->vs_events_missed = true;
424 return;
425 }
426
427again:
428 vhost_disable_notify(&vs->dev, vq);
429 head = vhost_get_vq_desc(&vs->dev, vq, vq->iov,
430 ARRAY_SIZE(vq->iov), &out, &in,
431 NULL, NULL);
432 if (head < 0) {
433 vs->vs_events_missed = true;
434 return;
435 }
436 if (head == vq->num) {
437 if (vhost_enable_notify(&vs->dev, vq))
438 goto again;
439 vs->vs_events_missed = true;
440 return;
441 }
442
443 if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
444 vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
445 vq->iov[out].iov_len);
446 vs->vs_events_missed = true;
447 return;
448 }
449
450 if (vs->vs_events_missed) {
451 event->event |= VIRTIO_SCSI_T_EVENTS_MISSED;
452 vs->vs_events_missed = false;
453 }
454
455 eventp = vq->iov[out].iov_base;
456 ret = __copy_to_user(eventp, event, sizeof(*event));
457 if (!ret)
458 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
459 else
460 vq_err(vq, "Faulted on tcm_vhost_send_event\n");
461}
462
463static void tcm_vhost_evt_work(struct vhost_work *work)
464{
465 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
466 vs_event_work);
Asias He3ab2e422013-04-27 11:16:48 +0800467 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +0800468 struct tcm_vhost_evt *evt;
469 struct llist_node *llnode;
470
471 mutex_lock(&vq->mutex);
472 llnode = llist_del_all(&vs->vs_event_list);
473 while (llnode) {
474 evt = llist_entry(llnode, struct tcm_vhost_evt, list);
475 llnode = llist_next(llnode);
476 tcm_vhost_do_evt_work(vs, evt);
477 tcm_vhost_free_evt(vs, evt);
478 }
479 mutex_unlock(&vq->mutex);
480}
481
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700482/* Fill in status and signal that we are done processing this command
483 *
484 * This is scheduled in the vhost work queue so we are called with the owner
485 * process mm and can access the vring.
486 */
487static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
488{
489 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
490 vs_completion_work);
Asias He1b7f3902013-02-06 13:20:59 +0800491 DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
Asias He9d6064a2013-01-06 14:36:13 +0800492 struct virtio_scsi_cmd_resp v_rsp;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700493 struct tcm_vhost_cmd *tv_cmd;
Asias He9d6064a2013-01-06 14:36:13 +0800494 struct llist_node *llnode;
495 struct se_cmd *se_cmd;
Asias He1b7f3902013-02-06 13:20:59 +0800496 int ret, vq;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700497
Asias He1b7f3902013-02-06 13:20:59 +0800498 bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
Asias He9d6064a2013-01-06 14:36:13 +0800499 llnode = llist_del_all(&vs->vs_completion_list);
500 while (llnode) {
501 tv_cmd = llist_entry(llnode, struct tcm_vhost_cmd,
502 tvc_completion_list);
503 llnode = llist_next(llnode);
504 se_cmd = &tv_cmd->tvc_se_cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700505
506 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
507 tv_cmd, se_cmd->residual_count, se_cmd->scsi_status);
508
509 memset(&v_rsp, 0, sizeof(v_rsp));
510 v_rsp.resid = se_cmd->residual_count;
511 /* TODO is status_qualifier field needed? */
512 v_rsp.status = se_cmd->scsi_status;
513 v_rsp.sense_len = se_cmd->scsi_sense_length;
514 memcpy(v_rsp.sense, tv_cmd->tvc_sense_buf,
515 v_rsp.sense_len);
516 ret = copy_to_user(tv_cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
Asias He1b7f3902013-02-06 13:20:59 +0800517 if (likely(ret == 0)) {
Asias He3ab2e422013-04-27 11:16:48 +0800518 struct vhost_scsi_virtqueue *q;
Asias He1b7f3902013-02-06 13:20:59 +0800519 vhost_add_used(tv_cmd->tvc_vq, tv_cmd->tvc_vq_desc, 0);
Asias He3ab2e422013-04-27 11:16:48 +0800520 q = container_of(tv_cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
521 vq = q - vs->vqs;
Asias He1b7f3902013-02-06 13:20:59 +0800522 __set_bit(vq, signal);
523 } else
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700524 pr_err("Faulted on virtio_scsi_cmd_resp\n");
525
526 vhost_scsi_free_cmd(tv_cmd);
527 }
528
Asias He1b7f3902013-02-06 13:20:59 +0800529 vq = -1;
530 while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
531 < VHOST_SCSI_MAX_VQ)
Asias He3ab2e422013-04-27 11:16:48 +0800532 vhost_signal(&vs->dev, &vs->vqs[vq].vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700533}
534
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700535static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd(
536 struct tcm_vhost_tpg *tv_tpg,
537 struct virtio_scsi_cmd_req *v_req,
538 u32 exp_data_len,
539 int data_direction)
540{
541 struct tcm_vhost_cmd *tv_cmd;
542 struct tcm_vhost_nexus *tv_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700543
544 tv_nexus = tv_tpg->tpg_nexus;
545 if (!tv_nexus) {
546 pr_err("Unable to locate active struct tcm_vhost_nexus\n");
547 return ERR_PTR(-EIO);
548 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700549
550 tv_cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC);
551 if (!tv_cmd) {
552 pr_err("Unable to allocate struct tcm_vhost_cmd\n");
553 return ERR_PTR(-ENOMEM);
554 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700555 tv_cmd->tvc_tag = v_req->tag;
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700556 tv_cmd->tvc_task_attr = v_req->task_attr;
557 tv_cmd->tvc_exp_data_len = exp_data_len;
558 tv_cmd->tvc_data_direction = data_direction;
559 tv_cmd->tvc_nexus = tv_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700560
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700561 return tv_cmd;
562}
563
564/*
565 * Map a user memory range into a scatterlist
566 *
567 * Returns the number of scatterlist entries used or -errno on error.
568 */
569static int vhost_scsi_map_to_sgl(struct scatterlist *sgl,
Asias He18100532013-01-22 11:20:27 +0800570 unsigned int sgl_count, struct iovec *iov, int write)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700571{
Asias He18100532013-01-22 11:20:27 +0800572 unsigned int npages = 0, pages_nr, offset, nbytes;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700573 struct scatterlist *sg = sgl;
Asias He18100532013-01-22 11:20:27 +0800574 void __user *ptr = iov->iov_base;
575 size_t len = iov->iov_len;
576 struct page **pages;
577 int ret, i;
578
579 pages_nr = iov_num_pages(iov);
580 if (pages_nr > sgl_count)
581 return -ENOBUFS;
582
583 pages = kmalloc(pages_nr * sizeof(struct page *), GFP_KERNEL);
584 if (!pages)
585 return -ENOMEM;
586
587 ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
588 /* No pages were pinned */
589 if (ret < 0)
590 goto out;
591 /* Less pages pinned than wanted */
592 if (ret != pages_nr) {
593 for (i = 0; i < ret; i++)
594 put_page(pages[i]);
595 ret = -EFAULT;
596 goto out;
597 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700598
599 while (len > 0) {
Asias He18100532013-01-22 11:20:27 +0800600 offset = (uintptr_t)ptr & ~PAGE_MASK;
601 nbytes = min_t(unsigned int, PAGE_SIZE - offset, len);
602 sg_set_page(sg, pages[npages], nbytes, offset);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700603 ptr += nbytes;
604 len -= nbytes;
605 sg++;
606 npages++;
607 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700608
Asias He18100532013-01-22 11:20:27 +0800609out:
610 kfree(pages);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700611 return ret;
612}
613
614static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd,
615 struct iovec *iov, unsigned int niov, int write)
616{
617 int ret;
618 unsigned int i;
619 u32 sgl_count;
620 struct scatterlist *sg;
621
622 /*
623 * Find out how long sglist needs to be
624 */
625 sgl_count = 0;
Asias Hef3158f32013-01-22 11:20:26 +0800626 for (i = 0; i < niov; i++)
627 sgl_count += iov_num_pages(&iov[i]);
628
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700629 /* TODO overflow checking */
630
631 sg = kmalloc(sizeof(tv_cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC);
632 if (!sg)
633 return -ENOMEM;
Fengguang Wuf0e0e9b2012-07-30 13:19:07 -0700634 pr_debug("%s sg %p sgl_count %u is_err %d\n", __func__,
635 sg, sgl_count, !sg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700636 sg_init_table(sg, sgl_count);
637
638 tv_cmd->tvc_sgl = sg;
639 tv_cmd->tvc_sgl_count = sgl_count;
640
641 pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count);
642 for (i = 0; i < niov; i++) {
Asias He18100532013-01-22 11:20:27 +0800643 ret = vhost_scsi_map_to_sgl(sg, sgl_count, &iov[i], write);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700644 if (ret < 0) {
645 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
646 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
647 kfree(tv_cmd->tvc_sgl);
648 tv_cmd->tvc_sgl = NULL;
649 tv_cmd->tvc_sgl_count = 0;
650 return ret;
651 }
652
653 sg += ret;
654 sgl_count -= ret;
655 }
656 return 0;
657}
658
659static void tcm_vhost_submission_work(struct work_struct *work)
660{
661 struct tcm_vhost_cmd *tv_cmd =
662 container_of(work, struct tcm_vhost_cmd, work);
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700663 struct tcm_vhost_nexus *tv_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700664 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
665 struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL;
666 int rc, sg_no_bidi = 0;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700667
668 if (tv_cmd->tvc_sgl_count) {
669 sg_ptr = tv_cmd->tvc_sgl;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700670/* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */
671#if 0
672 if (se_cmd->se_cmd_flags & SCF_BIDI) {
673 sg_bidi_ptr = NULL;
674 sg_no_bidi = 0;
675 }
676#endif
677 } else {
678 sg_ptr = NULL;
679 }
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700680 tv_nexus = tv_cmd->tvc_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700681
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700682 rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
683 tv_cmd->tvc_cdb, &tv_cmd->tvc_sense_buf[0],
684 tv_cmd->tvc_lun, tv_cmd->tvc_exp_data_len,
685 tv_cmd->tvc_task_attr, tv_cmd->tvc_data_direction,
686 0, sg_ptr, tv_cmd->tvc_sgl_count,
687 sg_bidi_ptr, sg_no_bidi);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700688 if (rc < 0) {
689 transport_send_check_condition_and_sense(se_cmd,
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700690 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700691 transport_generic_free_cmd(se_cmd, 0);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700692 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700693}
694
Asias He637ab212013-04-10 15:06:15 +0800695static void vhost_scsi_send_bad_target(struct vhost_scsi *vs,
696 struct vhost_virtqueue *vq, int head, unsigned out)
697{
698 struct virtio_scsi_cmd_resp __user *resp;
699 struct virtio_scsi_cmd_resp rsp;
700 int ret;
701
702 memset(&rsp, 0, sizeof(rsp));
703 rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
704 resp = vq->iov[out].iov_base;
705 ret = __copy_to_user(resp, &rsp, sizeof(rsp));
706 if (!ret)
707 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
708 else
709 pr_err("Faulted on virtio_scsi_cmd_resp\n");
710}
711
Asias He1b7f3902013-02-06 13:20:59 +0800712static void vhost_scsi_handle_vq(struct vhost_scsi *vs,
713 struct vhost_virtqueue *vq)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700714{
Asias He4f7f46d2013-04-03 14:17:37 +0800715 struct tcm_vhost_tpg **vs_tpg;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700716 struct virtio_scsi_cmd_req v_req;
717 struct tcm_vhost_tpg *tv_tpg;
718 struct tcm_vhost_cmd *tv_cmd;
719 u32 exp_data_len, data_first, data_num, data_direction;
720 unsigned out, in, i;
721 int head, ret;
Asias He67e18cf2013-02-05 12:31:57 +0800722 u8 target;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700723
Asias He4f7f46d2013-04-03 14:17:37 +0800724 /*
725 * We can handle the vq only after the endpoint is setup by calling the
726 * VHOST_SCSI_SET_ENDPOINT ioctl.
727 *
728 * TODO: Check that we are running from vhost_worker which acts
729 * as read-side critical section for vhost kind of RCU.
730 * See the comments in struct vhost_virtqueue in drivers/vhost/vhost.h
731 */
732 vs_tpg = rcu_dereference_check(vq->private_data, 1);
733 if (!vs_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700734 return;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700735
736 mutex_lock(&vq->mutex);
737 vhost_disable_notify(&vs->dev, vq);
738
739 for (;;) {
740 head = vhost_get_vq_desc(&vs->dev, vq, vq->iov,
741 ARRAY_SIZE(vq->iov), &out, &in,
742 NULL, NULL);
743 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
744 head, out, in);
745 /* On error, stop handling until the next kick. */
746 if (unlikely(head < 0))
747 break;
748 /* Nothing new? Wait for eventfd to tell us they refilled. */
749 if (head == vq->num) {
750 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
751 vhost_disable_notify(&vs->dev, vq);
752 continue;
753 }
754 break;
755 }
756
757/* FIXME: BIDI operation */
758 if (out == 1 && in == 1) {
759 data_direction = DMA_NONE;
760 data_first = 0;
761 data_num = 0;
762 } else if (out == 1 && in > 1) {
763 data_direction = DMA_FROM_DEVICE;
764 data_first = out + 1;
765 data_num = in - 1;
766 } else if (out > 1 && in == 1) {
767 data_direction = DMA_TO_DEVICE;
768 data_first = 1;
769 data_num = out - 1;
770 } else {
771 vq_err(vq, "Invalid buffer layout out: %u in: %u\n",
772 out, in);
773 break;
774 }
775
776 /*
777 * Check for a sane resp buffer so we can report errors to
778 * the guest.
779 */
780 if (unlikely(vq->iov[out].iov_len !=
781 sizeof(struct virtio_scsi_cmd_resp))) {
782 vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
783 " bytes\n", vq->iov[out].iov_len);
784 break;
785 }
786
787 if (unlikely(vq->iov[0].iov_len != sizeof(v_req))) {
788 vq_err(vq, "Expecting virtio_scsi_cmd_req, got %zu"
789 " bytes\n", vq->iov[0].iov_len);
790 break;
791 }
792 pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p,"
793 " len: %zu\n", vq->iov[0].iov_base, sizeof(v_req));
794 ret = __copy_from_user(&v_req, vq->iov[0].iov_base,
795 sizeof(v_req));
796 if (unlikely(ret)) {
797 vq_err(vq, "Faulted on virtio_scsi_cmd_req\n");
798 break;
799 }
800
Asias He67e18cf2013-02-05 12:31:57 +0800801 /* Extract the tpgt */
802 target = v_req.lun[1];
Asias He4f7f46d2013-04-03 14:17:37 +0800803 tv_tpg = ACCESS_ONCE(vs_tpg[target]);
Asias He67e18cf2013-02-05 12:31:57 +0800804
805 /* Target does not exist, fail the request */
806 if (unlikely(!tv_tpg)) {
Asias He637ab212013-04-10 15:06:15 +0800807 vhost_scsi_send_bad_target(vs, vq, head, out);
Asias He67e18cf2013-02-05 12:31:57 +0800808 continue;
809 }
810
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700811 exp_data_len = 0;
812 for (i = 0; i < data_num; i++)
813 exp_data_len += vq->iov[data_first + i].iov_len;
814
815 tv_cmd = vhost_scsi_allocate_cmd(tv_tpg, &v_req,
816 exp_data_len, data_direction);
817 if (IS_ERR(tv_cmd)) {
818 vq_err(vq, "vhost_scsi_allocate_cmd failed %ld\n",
819 PTR_ERR(tv_cmd));
Asias He055f6482013-04-10 15:06:16 +0800820 goto err_cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700821 }
822 pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
823 ": %d\n", tv_cmd, exp_data_len, data_direction);
824
825 tv_cmd->tvc_vhost = vs;
Asias He1b7f3902013-02-06 13:20:59 +0800826 tv_cmd->tvc_vq = vq;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700827 tv_cmd->tvc_resp = vq->iov[out].iov_base;
828
829 /*
830 * Copy in the recieved CDB descriptor into tv_cmd->tvc_cdb
831 * that will be used by tcm_vhost_new_cmd_map() and down into
832 * target_setup_cmd_from_cdb()
833 */
834 memcpy(tv_cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE);
835 /*
836 * Check that the recieved CDB size does not exceeded our
837 * hardcoded max for tcm_vhost
838 */
839 /* TODO what if cdb was too small for varlen cdb header? */
840 if (unlikely(scsi_command_size(tv_cmd->tvc_cdb) >
841 TCM_VHOST_MAX_CDB_SIZE)) {
842 vq_err(vq, "Received SCSI CDB with command_size: %d that"
843 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
844 scsi_command_size(tv_cmd->tvc_cdb),
845 TCM_VHOST_MAX_CDB_SIZE);
Asias He055f6482013-04-10 15:06:16 +0800846 goto err_free;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700847 }
848 tv_cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
849
850 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
851 tv_cmd->tvc_cdb[0], tv_cmd->tvc_lun);
852
853 if (data_direction != DMA_NONE) {
854 ret = vhost_scsi_map_iov_to_sgl(tv_cmd,
855 &vq->iov[data_first], data_num,
856 data_direction == DMA_TO_DEVICE);
857 if (unlikely(ret)) {
858 vq_err(vq, "Failed to map iov to sgl\n");
Asias He055f6482013-04-10 15:06:16 +0800859 goto err_free;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700860 }
861 }
862
863 /*
864 * Save the descriptor from vhost_get_vq_desc() to be used to
865 * complete the virtio-scsi request in TCM callback context via
866 * tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
867 */
868 tv_cmd->tvc_vq_desc = head;
869 /*
870 * Dispatch tv_cmd descriptor for cmwq execution in process
871 * context provided by tcm_vhost_workqueue. This also ensures
872 * tv_cmd is executed on the same kworker CPU as this vhost
873 * thread to gain positive L2 cache locality effects..
874 */
875 INIT_WORK(&tv_cmd->work, tcm_vhost_submission_work);
876 queue_work(tcm_vhost_workqueue, &tv_cmd->work);
877 }
878
879 mutex_unlock(&vq->mutex);
Asias He7ea206c2013-04-10 15:06:14 +0800880 return;
881
Asias He055f6482013-04-10 15:06:16 +0800882err_free:
Asias He7ea206c2013-04-10 15:06:14 +0800883 vhost_scsi_free_cmd(tv_cmd);
Asias He055f6482013-04-10 15:06:16 +0800884err_cmd:
885 vhost_scsi_send_bad_target(vs, vq, head, out);
Asias He7ea206c2013-04-10 15:06:14 +0800886 mutex_unlock(&vq->mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700887}
888
889static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
890{
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700891 pr_debug("%s: The handling func for control queue.\n", __func__);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700892}
893
Asias Hea6c9af82013-04-25 15:35:21 +0800894static void tcm_vhost_send_evt(struct vhost_scsi *vs, struct tcm_vhost_tpg *tpg,
895 struct se_lun *lun, u32 event, u32 reason)
896{
897 struct tcm_vhost_evt *evt;
898
899 evt = tcm_vhost_allocate_evt(vs, event, reason);
900 if (!evt)
901 return;
902
903 if (tpg && lun) {
904 /* TODO: share lun setup code with virtio-scsi.ko */
905 /*
906 * Note: evt->event is zeroed when we allocate it and
907 * lun[4-7] need to be zero according to virtio-scsi spec.
908 */
909 evt->event.lun[0] = 0x01;
910 evt->event.lun[1] = tpg->tport_tpgt & 0xFF;
911 if (lun->unpacked_lun >= 256)
912 evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
913 evt->event.lun[3] = lun->unpacked_lun & 0xFF;
914 }
915
916 llist_add(&evt->list, &vs->vs_event_list);
917 vhost_work_queue(&vs->dev, &vs->vs_event_work);
918}
919
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700920static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
921{
Asias Hea6c9af82013-04-25 15:35:21 +0800922 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
923 poll.work);
924 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
925
926 mutex_lock(&vq->mutex);
927 if (!vq->private_data)
928 goto out;
929
930 if (vs->vs_events_missed)
931 tcm_vhost_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
932out:
933 mutex_unlock(&vq->mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700934}
935
936static void vhost_scsi_handle_kick(struct vhost_work *work)
937{
938 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
939 poll.work);
940 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
941
Asias He1b7f3902013-02-06 13:20:59 +0800942 vhost_scsi_handle_vq(vs, vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700943}
944
Asias He4f7f46d2013-04-03 14:17:37 +0800945static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
946{
Asias He3ab2e422013-04-27 11:16:48 +0800947 vhost_poll_flush(&vs->vqs[index].vq.poll);
Asias He4f7f46d2013-04-03 14:17:37 +0800948}
949
950static void vhost_scsi_flush(struct vhost_scsi *vs)
951{
952 int i;
953
954 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
955 vhost_scsi_flush_vq(vs, i);
956 vhost_work_flush(&vs->dev, &vs->vs_completion_work);
Asias Hea6c9af82013-04-25 15:35:21 +0800957 vhost_work_flush(&vs->dev, &vs->vs_event_work);
Asias He4f7f46d2013-04-03 14:17:37 +0800958}
959
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700960/*
961 * Called from vhost_scsi_ioctl() context to walk the list of available
962 * tcm_vhost_tpg with an active struct tcm_vhost_nexus
Asias Hef2b7daf2013-04-25 15:35:20 +0800963 *
964 * The lock nesting rule is:
965 * tcm_vhost_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700966 */
967static int vhost_scsi_set_endpoint(
968 struct vhost_scsi *vs,
969 struct vhost_scsi_target *t)
970{
971 struct tcm_vhost_tport *tv_tport;
972 struct tcm_vhost_tpg *tv_tpg;
Asias He4f7f46d2013-04-03 14:17:37 +0800973 struct tcm_vhost_tpg **vs_tpg;
974 struct vhost_virtqueue *vq;
975 int index, ret, i, len;
Asias He67e18cf2013-02-05 12:31:57 +0800976 bool match = false;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700977
Asias Hef2b7daf2013-04-25 15:35:20 +0800978 mutex_lock(&tcm_vhost_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700979 mutex_lock(&vs->dev.mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +0800980
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700981 /* Verify that ring has been setup correctly. */
982 for (index = 0; index < vs->dev.nvqs; ++index) {
983 /* Verify that ring has been setup correctly. */
Asias He3ab2e422013-04-27 11:16:48 +0800984 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
Asias Hef2b7daf2013-04-25 15:35:20 +0800985 ret = -EFAULT;
986 goto out;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700987 }
988 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700989
Asias He4f7f46d2013-04-03 14:17:37 +0800990 len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
991 vs_tpg = kzalloc(len, GFP_KERNEL);
992 if (!vs_tpg) {
Asias Hef2b7daf2013-04-25 15:35:20 +0800993 ret = -ENOMEM;
994 goto out;
Asias He4f7f46d2013-04-03 14:17:37 +0800995 }
996 if (vs->vs_tpg)
997 memcpy(vs_tpg, vs->vs_tpg, len);
998
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700999 list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) {
1000 mutex_lock(&tv_tpg->tv_tpg_mutex);
1001 if (!tv_tpg->tpg_nexus) {
1002 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1003 continue;
1004 }
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001005 if (tv_tpg->tv_tpg_vhost_count != 0) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001006 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1007 continue;
1008 }
1009 tv_tport = tv_tpg->tport;
1010
Asias He67e18cf2013-02-05 12:31:57 +08001011 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
Asias He4f7f46d2013-04-03 14:17:37 +08001012 if (vs->vs_tpg && vs->vs_tpg[tv_tpg->tport_tpgt]) {
Asias He4f7f46d2013-04-03 14:17:37 +08001013 kfree(vs_tpg);
Asias Hef2b7daf2013-04-25 15:35:20 +08001014 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1015 ret = -EEXIST;
1016 goto out;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001017 }
Asias He67e18cf2013-02-05 12:31:57 +08001018 tv_tpg->tv_tpg_vhost_count++;
Asias Hea6c9af82013-04-25 15:35:21 +08001019 tv_tpg->vhost_scsi = vs;
Asias He4f7f46d2013-04-03 14:17:37 +08001020 vs_tpg[tv_tpg->tport_tpgt] = tv_tpg;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001021 smp_mb__after_atomic_inc();
Asias He67e18cf2013-02-05 12:31:57 +08001022 match = true;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001023 }
1024 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1025 }
Asias He67e18cf2013-02-05 12:31:57 +08001026
1027 if (match) {
1028 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1029 sizeof(vs->vs_vhost_wwpn));
Asias He4f7f46d2013-04-03 14:17:37 +08001030 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
Asias He3ab2e422013-04-27 11:16:48 +08001031 vq = &vs->vqs[i].vq;
Asias He4f7f46d2013-04-03 14:17:37 +08001032 /* Flushing the vhost_work acts as synchronize_rcu */
1033 mutex_lock(&vq->mutex);
1034 rcu_assign_pointer(vq->private_data, vs_tpg);
Asias Hedfd5d562013-04-03 14:17:38 +08001035 vhost_init_used(vq);
Asias He4f7f46d2013-04-03 14:17:37 +08001036 mutex_unlock(&vq->mutex);
1037 }
Asias He67e18cf2013-02-05 12:31:57 +08001038 ret = 0;
1039 } else {
1040 ret = -EEXIST;
1041 }
1042
Asias He4f7f46d2013-04-03 14:17:37 +08001043 /*
1044 * Act as synchronize_rcu to make sure access to
1045 * old vs->vs_tpg is finished.
1046 */
1047 vhost_scsi_flush(vs);
1048 kfree(vs->vs_tpg);
1049 vs->vs_tpg = vs_tpg;
1050
Asias Hef2b7daf2013-04-25 15:35:20 +08001051out:
Asias He67e18cf2013-02-05 12:31:57 +08001052 mutex_unlock(&vs->dev.mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001053 mutex_unlock(&tcm_vhost_mutex);
Asias He67e18cf2013-02-05 12:31:57 +08001054 return ret;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001055}
1056
1057static int vhost_scsi_clear_endpoint(
1058 struct vhost_scsi *vs,
1059 struct vhost_scsi_target *t)
1060{
1061 struct tcm_vhost_tport *tv_tport;
1062 struct tcm_vhost_tpg *tv_tpg;
Asias He4f7f46d2013-04-03 14:17:37 +08001063 struct vhost_virtqueue *vq;
1064 bool match = false;
Asias He67e18cf2013-02-05 12:31:57 +08001065 int index, ret, i;
1066 u8 target;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001067
Asias Hef2b7daf2013-04-25 15:35:20 +08001068 mutex_lock(&tcm_vhost_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001069 mutex_lock(&vs->dev.mutex);
1070 /* Verify that ring has been setup correctly. */
1071 for (index = 0; index < vs->dev.nvqs; ++index) {
Asias He3ab2e422013-04-27 11:16:48 +08001072 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001073 ret = -EFAULT;
Asias He038e0af2013-03-15 09:14:05 +08001074 goto err_dev;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001075 }
1076 }
Asias He4f7f46d2013-04-03 14:17:37 +08001077
1078 if (!vs->vs_tpg) {
Asias Hef2b7daf2013-04-25 15:35:20 +08001079 ret = 0;
1080 goto err_dev;
Asias He4f7f46d2013-04-03 14:17:37 +08001081 }
1082
Asias He67e18cf2013-02-05 12:31:57 +08001083 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1084 target = i;
Asias He67e18cf2013-02-05 12:31:57 +08001085 tv_tpg = vs->vs_tpg[target];
1086 if (!tv_tpg)
1087 continue;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001088
Asias He038e0af2013-03-15 09:14:05 +08001089 mutex_lock(&tv_tpg->tv_tpg_mutex);
Asias He67e18cf2013-02-05 12:31:57 +08001090 tv_tport = tv_tpg->tport;
1091 if (!tv_tport) {
1092 ret = -ENODEV;
Asias He038e0af2013-03-15 09:14:05 +08001093 goto err_tpg;
Asias He67e18cf2013-02-05 12:31:57 +08001094 }
1095
1096 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1097 pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu"
1098 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
1099 tv_tport->tport_name, tv_tpg->tport_tpgt,
1100 t->vhost_wwpn, t->vhost_tpgt);
1101 ret = -EINVAL;
Asias He038e0af2013-03-15 09:14:05 +08001102 goto err_tpg;
Asias He67e18cf2013-02-05 12:31:57 +08001103 }
1104 tv_tpg->tv_tpg_vhost_count--;
Asias Hea6c9af82013-04-25 15:35:21 +08001105 tv_tpg->vhost_scsi = NULL;
Asias He67e18cf2013-02-05 12:31:57 +08001106 vs->vs_tpg[target] = NULL;
Asias He4f7f46d2013-04-03 14:17:37 +08001107 match = true;
Asias He038e0af2013-03-15 09:14:05 +08001108 mutex_unlock(&tv_tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001109 }
Asias He4f7f46d2013-04-03 14:17:37 +08001110 if (match) {
1111 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
Asias He3ab2e422013-04-27 11:16:48 +08001112 vq = &vs->vqs[i].vq;
Asias He4f7f46d2013-04-03 14:17:37 +08001113 /* Flushing the vhost_work acts as synchronize_rcu */
1114 mutex_lock(&vq->mutex);
1115 rcu_assign_pointer(vq->private_data, NULL);
1116 mutex_unlock(&vq->mutex);
1117 }
1118 }
1119 /*
1120 * Act as synchronize_rcu to make sure access to
1121 * old vs->vs_tpg is finished.
1122 */
1123 vhost_scsi_flush(vs);
1124 kfree(vs->vs_tpg);
1125 vs->vs_tpg = NULL;
Asias Hea6c9af82013-04-25 15:35:21 +08001126 WARN_ON(vs->vs_events_nr);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001127 mutex_unlock(&vs->dev.mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001128 mutex_unlock(&tcm_vhost_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001129 return 0;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001130
Asias He038e0af2013-03-15 09:14:05 +08001131err_tpg:
1132 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1133err_dev:
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001134 mutex_unlock(&vs->dev.mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001135 mutex_unlock(&tcm_vhost_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001136 return ret;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001137}
1138
Asias He4f7f46d2013-04-03 14:17:37 +08001139static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1140{
1141 if (features & ~VHOST_SCSI_FEATURES)
1142 return -EOPNOTSUPP;
1143
1144 mutex_lock(&vs->dev.mutex);
1145 if ((features & (1 << VHOST_F_LOG_ALL)) &&
1146 !vhost_log_access_ok(&vs->dev)) {
1147 mutex_unlock(&vs->dev.mutex);
1148 return -EFAULT;
1149 }
1150 vs->dev.acked_features = features;
1151 smp_wmb();
1152 vhost_scsi_flush(vs);
1153 mutex_unlock(&vs->dev.mutex);
1154 return 0;
1155}
1156
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001157static int vhost_scsi_open(struct inode *inode, struct file *f)
1158{
1159 struct vhost_scsi *s;
Asias He3ab2e422013-04-27 11:16:48 +08001160 struct vhost_virtqueue **vqs;
Asias He1b7f3902013-02-06 13:20:59 +08001161 int r, i;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001162
1163 s = kzalloc(sizeof(*s), GFP_KERNEL);
1164 if (!s)
1165 return -ENOMEM;
1166
Asias He3ab2e422013-04-27 11:16:48 +08001167 vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL);
1168 if (!vqs) {
1169 kfree(s);
1170 return -ENOMEM;
1171 }
1172
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001173 vhost_work_init(&s->vs_completion_work, vhost_scsi_complete_cmd_work);
Asias Hea6c9af82013-04-25 15:35:21 +08001174 vhost_work_init(&s->vs_event_work, tcm_vhost_evt_work);
1175
1176 s->vs_events_nr = 0;
1177 s->vs_events_missed = false;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001178
Asias He3ab2e422013-04-27 11:16:48 +08001179 vqs[VHOST_SCSI_VQ_CTL] = &s->vqs[VHOST_SCSI_VQ_CTL].vq;
1180 vqs[VHOST_SCSI_VQ_EVT] = &s->vqs[VHOST_SCSI_VQ_EVT].vq;
1181 s->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1182 s->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
1183 for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
1184 vqs[i] = &s->vqs[i].vq;
1185 s->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
1186 }
1187 r = vhost_dev_init(&s->dev, vqs, VHOST_SCSI_MAX_VQ);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001188 if (r < 0) {
Asias He3ab2e422013-04-27 11:16:48 +08001189 kfree(vqs);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001190 kfree(s);
1191 return r;
1192 }
1193
1194 f->private_data = s;
1195 return 0;
1196}
1197
1198static int vhost_scsi_release(struct inode *inode, struct file *f)
1199{
1200 struct vhost_scsi *s = f->private_data;
Asias He67e18cf2013-02-05 12:31:57 +08001201 struct vhost_scsi_target t;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001202
Asias He67e18cf2013-02-05 12:31:57 +08001203 mutex_lock(&s->dev.mutex);
1204 memcpy(t.vhost_wwpn, s->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
1205 mutex_unlock(&s->dev.mutex);
1206 vhost_scsi_clear_endpoint(s, &t);
Michael S. Tsirkinb2116162012-11-01 09:16:46 +00001207 vhost_dev_stop(&s->dev);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001208 vhost_dev_cleanup(&s->dev, false);
Asias Hea6c9af82013-04-25 15:35:21 +08001209 /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
1210 vhost_scsi_flush(s);
Asias He3ab2e422013-04-27 11:16:48 +08001211 kfree(s->dev.vqs);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001212 kfree(s);
1213 return 0;
1214}
1215
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001216static long vhost_scsi_ioctl(struct file *f, unsigned int ioctl,
1217 unsigned long arg)
1218{
1219 struct vhost_scsi *vs = f->private_data;
1220 struct vhost_scsi_target backend;
1221 void __user *argp = (void __user *)arg;
1222 u64 __user *featurep = argp;
Asias He11c634182013-04-25 15:35:22 +08001223 u32 __user *eventsp = argp;
1224 u32 events_missed;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001225 u64 features;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001226 int r, abi_version = VHOST_SCSI_ABI_VERSION;
Asias He3ab2e422013-04-27 11:16:48 +08001227 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001228
1229 switch (ioctl) {
1230 case VHOST_SCSI_SET_ENDPOINT:
1231 if (copy_from_user(&backend, argp, sizeof backend))
1232 return -EFAULT;
Michael S. Tsirkin6de71452012-08-18 15:44:09 -07001233 if (backend.reserved != 0)
1234 return -EOPNOTSUPP;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001235
1236 return vhost_scsi_set_endpoint(vs, &backend);
1237 case VHOST_SCSI_CLEAR_ENDPOINT:
1238 if (copy_from_user(&backend, argp, sizeof backend))
1239 return -EFAULT;
Michael S. Tsirkin6de71452012-08-18 15:44:09 -07001240 if (backend.reserved != 0)
1241 return -EOPNOTSUPP;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001242
1243 return vhost_scsi_clear_endpoint(vs, &backend);
1244 case VHOST_SCSI_GET_ABI_VERSION:
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001245 if (copy_to_user(argp, &abi_version, sizeof abi_version))
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001246 return -EFAULT;
1247 return 0;
Asias He11c634182013-04-25 15:35:22 +08001248 case VHOST_SCSI_SET_EVENTS_MISSED:
1249 if (get_user(events_missed, eventsp))
1250 return -EFAULT;
1251 mutex_lock(&vq->mutex);
1252 vs->vs_events_missed = events_missed;
1253 mutex_unlock(&vq->mutex);
1254 return 0;
1255 case VHOST_SCSI_GET_EVENTS_MISSED:
1256 mutex_lock(&vq->mutex);
1257 events_missed = vs->vs_events_missed;
1258 mutex_unlock(&vq->mutex);
1259 if (put_user(events_missed, eventsp))
1260 return -EFAULT;
1261 return 0;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001262 case VHOST_GET_FEATURES:
Nicholas Bellinger5dade712013-03-27 17:23:41 -07001263 features = VHOST_SCSI_FEATURES;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001264 if (copy_to_user(featurep, &features, sizeof features))
1265 return -EFAULT;
1266 return 0;
1267 case VHOST_SET_FEATURES:
1268 if (copy_from_user(&features, featurep, sizeof features))
1269 return -EFAULT;
1270 return vhost_scsi_set_features(vs, features);
1271 default:
1272 mutex_lock(&vs->dev.mutex);
Michael S. Tsirkin935cdee2012-12-06 14:03:34 +02001273 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
1274 /* TODO: flush backend after dev ioctl. */
1275 if (r == -ENOIOCTLCMD)
1276 r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001277 mutex_unlock(&vs->dev.mutex);
1278 return r;
1279 }
1280}
1281
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001282#ifdef CONFIG_COMPAT
1283static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
1284 unsigned long arg)
1285{
1286 return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
1287}
1288#endif
1289
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001290static const struct file_operations vhost_scsi_fops = {
1291 .owner = THIS_MODULE,
1292 .release = vhost_scsi_release,
1293 .unlocked_ioctl = vhost_scsi_ioctl,
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001294#ifdef CONFIG_COMPAT
1295 .compat_ioctl = vhost_scsi_compat_ioctl,
1296#endif
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001297 .open = vhost_scsi_open,
1298 .llseek = noop_llseek,
1299};
1300
1301static struct miscdevice vhost_scsi_misc = {
1302 MISC_DYNAMIC_MINOR,
1303 "vhost-scsi",
1304 &vhost_scsi_fops,
1305};
1306
1307static int __init vhost_scsi_register(void)
1308{
1309 return misc_register(&vhost_scsi_misc);
1310}
1311
1312static int vhost_scsi_deregister(void)
1313{
1314 return misc_deregister(&vhost_scsi_misc);
1315}
1316
1317static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport)
1318{
1319 switch (tport->tport_proto_id) {
1320 case SCSI_PROTOCOL_SAS:
1321 return "SAS";
1322 case SCSI_PROTOCOL_FCP:
1323 return "FCP";
1324 case SCSI_PROTOCOL_ISCSI:
1325 return "iSCSI";
1326 default:
1327 break;
1328 }
1329
1330 return "Unknown";
1331}
1332
Asias Hea6c9af82013-04-25 15:35:21 +08001333static void tcm_vhost_do_plug(struct tcm_vhost_tpg *tpg,
1334 struct se_lun *lun, bool plug)
1335{
1336
1337 struct vhost_scsi *vs = tpg->vhost_scsi;
1338 struct vhost_virtqueue *vq;
1339 u32 reason;
1340
1341 if (!vs)
1342 return;
1343
1344 mutex_lock(&vs->dev.mutex);
1345 if (!vhost_has_feature(&vs->dev, VIRTIO_SCSI_F_HOTPLUG)) {
1346 mutex_unlock(&vs->dev.mutex);
1347 return;
1348 }
1349
1350 if (plug)
1351 reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
1352 else
1353 reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
1354
Asias He3ab2e422013-04-27 11:16:48 +08001355 vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +08001356 mutex_lock(&vq->mutex);
1357 tcm_vhost_send_evt(vs, tpg, lun,
1358 VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
1359 mutex_unlock(&vq->mutex);
1360 mutex_unlock(&vs->dev.mutex);
1361}
1362
1363static void tcm_vhost_hotplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
1364{
1365 tcm_vhost_do_plug(tpg, lun, true);
1366}
1367
1368static void tcm_vhost_hotunplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
1369{
1370 tcm_vhost_do_plug(tpg, lun, false);
1371}
1372
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001373static int tcm_vhost_port_link(struct se_portal_group *se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001374 struct se_lun *lun)
1375{
1376 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1377 struct tcm_vhost_tpg, se_tpg);
1378
Asias Hea6c9af82013-04-25 15:35:21 +08001379 mutex_lock(&tcm_vhost_mutex);
1380
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001381 mutex_lock(&tv_tpg->tv_tpg_mutex);
1382 tv_tpg->tv_tpg_port_count++;
1383 mutex_unlock(&tv_tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001384
Asias Hea6c9af82013-04-25 15:35:21 +08001385 tcm_vhost_hotplug(tv_tpg, lun);
1386
1387 mutex_unlock(&tcm_vhost_mutex);
1388
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001389 return 0;
1390}
1391
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001392static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg,
Asias Hea6c9af82013-04-25 15:35:21 +08001393 struct se_lun *lun)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001394{
1395 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1396 struct tcm_vhost_tpg, se_tpg);
1397
Asias Hea6c9af82013-04-25 15:35:21 +08001398 mutex_lock(&tcm_vhost_mutex);
1399
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001400 mutex_lock(&tv_tpg->tv_tpg_mutex);
1401 tv_tpg->tv_tpg_port_count--;
1402 mutex_unlock(&tv_tpg->tv_tpg_mutex);
Asias Hea6c9af82013-04-25 15:35:21 +08001403
1404 tcm_vhost_hotunplug(tv_tpg, lun);
1405
1406 mutex_unlock(&tcm_vhost_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001407}
1408
1409static struct se_node_acl *tcm_vhost_make_nodeacl(
1410 struct se_portal_group *se_tpg,
1411 struct config_group *group,
1412 const char *name)
1413{
1414 struct se_node_acl *se_nacl, *se_nacl_new;
1415 struct tcm_vhost_nacl *nacl;
1416 u64 wwpn = 0;
1417 u32 nexus_depth;
1418
1419 /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1420 return ERR_PTR(-EINVAL); */
1421 se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg);
1422 if (!se_nacl_new)
1423 return ERR_PTR(-ENOMEM);
1424
1425 nexus_depth = 1;
1426 /*
1427 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1428 * when converting a NodeACL from demo mode -> explict
1429 */
1430 se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1431 name, nexus_depth);
1432 if (IS_ERR(se_nacl)) {
1433 tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new);
1434 return se_nacl;
1435 }
1436 /*
1437 * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN
1438 */
1439 nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl);
1440 nacl->iport_wwpn = wwpn;
1441
1442 return se_nacl;
1443}
1444
1445static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl)
1446{
1447 struct tcm_vhost_nacl *nacl = container_of(se_acl,
1448 struct tcm_vhost_nacl, se_node_acl);
1449 core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1450 kfree(nacl);
1451}
1452
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001453static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tv_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001454 const char *name)
1455{
1456 struct se_portal_group *se_tpg;
1457 struct tcm_vhost_nexus *tv_nexus;
1458
1459 mutex_lock(&tv_tpg->tv_tpg_mutex);
1460 if (tv_tpg->tpg_nexus) {
1461 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1462 pr_debug("tv_tpg->tpg_nexus already exists\n");
1463 return -EEXIST;
1464 }
1465 se_tpg = &tv_tpg->se_tpg;
1466
1467 tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL);
1468 if (!tv_nexus) {
1469 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1470 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1471 return -ENOMEM;
1472 }
1473 /*
1474 * Initialize the struct se_session pointer
1475 */
1476 tv_nexus->tvn_se_sess = transport_init_session();
1477 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1478 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1479 kfree(tv_nexus);
1480 return -ENOMEM;
1481 }
1482 /*
1483 * Since we are running in 'demo mode' this call with generate a
1484 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1485 * the SCSI Initiator port name of the passed configfs group 'name'.
1486 */
1487 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1488 se_tpg, (unsigned char *)name);
1489 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1490 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1491 pr_debug("core_tpg_check_initiator_node_acl() failed"
1492 " for %s\n", name);
1493 transport_free_session(tv_nexus->tvn_se_sess);
1494 kfree(tv_nexus);
1495 return -ENOMEM;
1496 }
1497 /*
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001498 * Now register the TCM vhost virtual I_T Nexus as active with the
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001499 * call to __transport_register_session()
1500 */
1501 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1502 tv_nexus->tvn_se_sess, tv_nexus);
1503 tv_tpg->tpg_nexus = tv_nexus;
1504
1505 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1506 return 0;
1507}
1508
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001509static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg *tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001510{
1511 struct se_session *se_sess;
1512 struct tcm_vhost_nexus *tv_nexus;
1513
1514 mutex_lock(&tpg->tv_tpg_mutex);
1515 tv_nexus = tpg->tpg_nexus;
1516 if (!tv_nexus) {
1517 mutex_unlock(&tpg->tv_tpg_mutex);
1518 return -ENODEV;
1519 }
1520
1521 se_sess = tv_nexus->tvn_se_sess;
1522 if (!se_sess) {
1523 mutex_unlock(&tpg->tv_tpg_mutex);
1524 return -ENODEV;
1525 }
1526
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001527 if (tpg->tv_tpg_port_count != 0) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001528 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001529 pr_err("Unable to remove TCM_vhost I_T Nexus with"
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001530 " active TPG port count: %d\n",
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001531 tpg->tv_tpg_port_count);
1532 return -EBUSY;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001533 }
1534
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001535 if (tpg->tv_tpg_vhost_count != 0) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001536 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001537 pr_err("Unable to remove TCM_vhost I_T Nexus with"
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001538 " active TPG vhost count: %d\n",
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001539 tpg->tv_tpg_vhost_count);
1540 return -EBUSY;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001541 }
1542
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001543 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001544 " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport),
1545 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1546 /*
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001547 * Release the SCSI I_T Nexus to the emulated vhost Target Port
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001548 */
1549 transport_deregister_session(tv_nexus->tvn_se_sess);
1550 tpg->tpg_nexus = NULL;
1551 mutex_unlock(&tpg->tv_tpg_mutex);
1552
1553 kfree(tv_nexus);
1554 return 0;
1555}
1556
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001557static ssize_t tcm_vhost_tpg_show_nexus(struct se_portal_group *se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001558 char *page)
1559{
1560 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1561 struct tcm_vhost_tpg, se_tpg);
1562 struct tcm_vhost_nexus *tv_nexus;
1563 ssize_t ret;
1564
1565 mutex_lock(&tv_tpg->tv_tpg_mutex);
1566 tv_nexus = tv_tpg->tpg_nexus;
1567 if (!tv_nexus) {
1568 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1569 return -ENODEV;
1570 }
1571 ret = snprintf(page, PAGE_SIZE, "%s\n",
1572 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1573 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1574
1575 return ret;
1576}
1577
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001578static ssize_t tcm_vhost_tpg_store_nexus(struct se_portal_group *se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001579 const char *page,
1580 size_t count)
1581{
1582 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1583 struct tcm_vhost_tpg, se_tpg);
1584 struct tcm_vhost_tport *tport_wwn = tv_tpg->tport;
1585 unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr;
1586 int ret;
1587 /*
1588 * Shutdown the active I_T nexus if 'NULL' is passed..
1589 */
1590 if (!strncmp(page, "NULL", 4)) {
1591 ret = tcm_vhost_drop_nexus(tv_tpg);
1592 return (!ret) ? count : ret;
1593 }
1594 /*
1595 * Otherwise make sure the passed virtual Initiator port WWN matches
1596 * the fabric protocol_id set in tcm_vhost_make_tport(), and call
1597 * tcm_vhost_make_nexus().
1598 */
1599 if (strlen(page) >= TCM_VHOST_NAMELEN) {
1600 pr_err("Emulated NAA Sas Address: %s, exceeds"
1601 " max: %d\n", page, TCM_VHOST_NAMELEN);
1602 return -EINVAL;
1603 }
1604 snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page);
1605
1606 ptr = strstr(i_port, "naa.");
1607 if (ptr) {
1608 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1609 pr_err("Passed SAS Initiator Port %s does not"
1610 " match target port protoid: %s\n", i_port,
1611 tcm_vhost_dump_proto_id(tport_wwn));
1612 return -EINVAL;
1613 }
1614 port_ptr = &i_port[0];
1615 goto check_newline;
1616 }
1617 ptr = strstr(i_port, "fc.");
1618 if (ptr) {
1619 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1620 pr_err("Passed FCP Initiator Port %s does not"
1621 " match target port protoid: %s\n", i_port,
1622 tcm_vhost_dump_proto_id(tport_wwn));
1623 return -EINVAL;
1624 }
1625 port_ptr = &i_port[3]; /* Skip over "fc." */
1626 goto check_newline;
1627 }
1628 ptr = strstr(i_port, "iqn.");
1629 if (ptr) {
1630 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1631 pr_err("Passed iSCSI Initiator Port %s does not"
1632 " match target port protoid: %s\n", i_port,
1633 tcm_vhost_dump_proto_id(tport_wwn));
1634 return -EINVAL;
1635 }
1636 port_ptr = &i_port[0];
1637 goto check_newline;
1638 }
1639 pr_err("Unable to locate prefix for emulated Initiator Port:"
1640 " %s\n", i_port);
1641 return -EINVAL;
1642 /*
1643 * Clear any trailing newline for the NAA WWN
1644 */
1645check_newline:
1646 if (i_port[strlen(i_port)-1] == '\n')
1647 i_port[strlen(i_port)-1] = '\0';
1648
1649 ret = tcm_vhost_make_nexus(tv_tpg, port_ptr);
1650 if (ret < 0)
1651 return ret;
1652
1653 return count;
1654}
1655
1656TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR);
1657
1658static struct configfs_attribute *tcm_vhost_tpg_attrs[] = {
1659 &tcm_vhost_tpg_nexus.attr,
1660 NULL,
1661};
1662
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001663static struct se_portal_group *tcm_vhost_make_tpg(struct se_wwn *wwn,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001664 struct config_group *group,
1665 const char *name)
1666{
1667 struct tcm_vhost_tport *tport = container_of(wwn,
1668 struct tcm_vhost_tport, tport_wwn);
1669
1670 struct tcm_vhost_tpg *tpg;
1671 unsigned long tpgt;
1672 int ret;
1673
1674 if (strstr(name, "tpgt_") != name)
1675 return ERR_PTR(-EINVAL);
1676 if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
1677 return ERR_PTR(-EINVAL);
1678
1679 tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL);
1680 if (!tpg) {
1681 pr_err("Unable to allocate struct tcm_vhost_tpg");
1682 return ERR_PTR(-ENOMEM);
1683 }
1684 mutex_init(&tpg->tv_tpg_mutex);
1685 INIT_LIST_HEAD(&tpg->tv_tpg_list);
1686 tpg->tport = tport;
1687 tpg->tport_tpgt = tpgt;
1688
1689 ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn,
1690 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
1691 if (ret < 0) {
1692 kfree(tpg);
1693 return NULL;
1694 }
1695 mutex_lock(&tcm_vhost_mutex);
1696 list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list);
1697 mutex_unlock(&tcm_vhost_mutex);
1698
1699 return &tpg->se_tpg;
1700}
1701
1702static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg)
1703{
1704 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
1705 struct tcm_vhost_tpg, se_tpg);
1706
1707 mutex_lock(&tcm_vhost_mutex);
1708 list_del(&tpg->tv_tpg_list);
1709 mutex_unlock(&tcm_vhost_mutex);
1710 /*
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001711 * Release the virtual I_T Nexus for this vhost TPG
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001712 */
1713 tcm_vhost_drop_nexus(tpg);
1714 /*
1715 * Deregister the se_tpg from TCM..
1716 */
1717 core_tpg_deregister(se_tpg);
1718 kfree(tpg);
1719}
1720
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001721static struct se_wwn *tcm_vhost_make_tport(struct target_fabric_configfs *tf,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001722 struct config_group *group,
1723 const char *name)
1724{
1725 struct tcm_vhost_tport *tport;
1726 char *ptr;
1727 u64 wwpn = 0;
1728 int off = 0;
1729
1730 /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1731 return ERR_PTR(-EINVAL); */
1732
1733 tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL);
1734 if (!tport) {
1735 pr_err("Unable to allocate struct tcm_vhost_tport");
1736 return ERR_PTR(-ENOMEM);
1737 }
1738 tport->tport_wwpn = wwpn;
1739 /*
1740 * Determine the emulated Protocol Identifier and Target Port Name
1741 * based on the incoming configfs directory name.
1742 */
1743 ptr = strstr(name, "naa.");
1744 if (ptr) {
1745 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
1746 goto check_len;
1747 }
1748 ptr = strstr(name, "fc.");
1749 if (ptr) {
1750 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
1751 off = 3; /* Skip over "fc." */
1752 goto check_len;
1753 }
1754 ptr = strstr(name, "iqn.");
1755 if (ptr) {
1756 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
1757 goto check_len;
1758 }
1759
1760 pr_err("Unable to locate prefix for emulated Target Port:"
1761 " %s\n", name);
1762 kfree(tport);
1763 return ERR_PTR(-EINVAL);
1764
1765check_len:
1766 if (strlen(name) >= TCM_VHOST_NAMELEN) {
1767 pr_err("Emulated %s Address: %s, exceeds"
1768 " max: %d\n", name, tcm_vhost_dump_proto_id(tport),
1769 TCM_VHOST_NAMELEN);
1770 kfree(tport);
1771 return ERR_PTR(-EINVAL);
1772 }
1773 snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]);
1774
1775 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
1776 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name);
1777
1778 return &tport->tport_wwn;
1779}
1780
1781static void tcm_vhost_drop_tport(struct se_wwn *wwn)
1782{
1783 struct tcm_vhost_tport *tport = container_of(wwn,
1784 struct tcm_vhost_tport, tport_wwn);
1785
1786 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
1787 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport),
1788 tport->tport_name);
1789
1790 kfree(tport);
1791}
1792
1793static ssize_t tcm_vhost_wwn_show_attr_version(
1794 struct target_fabric_configfs *tf,
1795 char *page)
1796{
1797 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
1798 "on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
1799 utsname()->machine);
1800}
1801
1802TF_WWN_ATTR_RO(tcm_vhost, version);
1803
1804static struct configfs_attribute *tcm_vhost_wwn_attrs[] = {
1805 &tcm_vhost_wwn_version.attr,
1806 NULL,
1807};
1808
1809static struct target_core_fabric_ops tcm_vhost_ops = {
1810 .get_fabric_name = tcm_vhost_get_fabric_name,
1811 .get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident,
1812 .tpg_get_wwn = tcm_vhost_get_fabric_wwn,
1813 .tpg_get_tag = tcm_vhost_get_tag,
1814 .tpg_get_default_depth = tcm_vhost_get_default_depth,
1815 .tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id,
1816 .tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len,
1817 .tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id,
1818 .tpg_check_demo_mode = tcm_vhost_check_true,
1819 .tpg_check_demo_mode_cache = tcm_vhost_check_true,
1820 .tpg_check_demo_mode_write_protect = tcm_vhost_check_false,
1821 .tpg_check_prod_mode_write_protect = tcm_vhost_check_false,
1822 .tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl,
1823 .tpg_release_fabric_acl = tcm_vhost_release_fabric_acl,
1824 .tpg_get_inst_index = tcm_vhost_tpg_get_inst_index,
1825 .release_cmd = tcm_vhost_release_cmd,
1826 .shutdown_session = tcm_vhost_shutdown_session,
1827 .close_session = tcm_vhost_close_session,
1828 .sess_get_index = tcm_vhost_sess_get_index,
1829 .sess_get_initiator_sid = NULL,
1830 .write_pending = tcm_vhost_write_pending,
1831 .write_pending_status = tcm_vhost_write_pending_status,
1832 .set_default_node_attributes = tcm_vhost_set_default_node_attrs,
1833 .get_task_tag = tcm_vhost_get_task_tag,
1834 .get_cmd_state = tcm_vhost_get_cmd_state,
1835 .queue_data_in = tcm_vhost_queue_data_in,
1836 .queue_status = tcm_vhost_queue_status,
1837 .queue_tm_rsp = tcm_vhost_queue_tm_rsp,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001838 /*
1839 * Setup callers for generic logic in target_core_fabric_configfs.c
1840 */
1841 .fabric_make_wwn = tcm_vhost_make_tport,
1842 .fabric_drop_wwn = tcm_vhost_drop_tport,
1843 .fabric_make_tpg = tcm_vhost_make_tpg,
1844 .fabric_drop_tpg = tcm_vhost_drop_tpg,
1845 .fabric_post_link = tcm_vhost_port_link,
1846 .fabric_pre_unlink = tcm_vhost_port_unlink,
1847 .fabric_make_np = NULL,
1848 .fabric_drop_np = NULL,
1849 .fabric_make_nodeacl = tcm_vhost_make_nodeacl,
1850 .fabric_drop_nodeacl = tcm_vhost_drop_nodeacl,
1851};
1852
1853static int tcm_vhost_register_configfs(void)
1854{
1855 struct target_fabric_configfs *fabric;
1856 int ret;
1857
1858 pr_debug("TCM_VHOST fabric module %s on %s/%s"
1859 " on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
1860 utsname()->machine);
1861 /*
1862 * Register the top level struct config_item_type with TCM core
1863 */
1864 fabric = target_fabric_configfs_init(THIS_MODULE, "vhost");
1865 if (IS_ERR(fabric)) {
1866 pr_err("target_fabric_configfs_init() failed\n");
1867 return PTR_ERR(fabric);
1868 }
1869 /*
1870 * Setup fabric->tf_ops from our local tcm_vhost_ops
1871 */
1872 fabric->tf_ops = tcm_vhost_ops;
1873 /*
1874 * Setup default attribute lists for various fabric->tf_cit_tmpl
1875 */
1876 TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs;
1877 TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs;
1878 TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1879 TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1880 TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1881 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
1882 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
1883 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
1884 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
1885 /*
1886 * Register the fabric for use within TCM
1887 */
1888 ret = target_fabric_configfs_register(fabric);
1889 if (ret < 0) {
1890 pr_err("target_fabric_configfs_register() failed"
1891 " for TCM_VHOST\n");
1892 return ret;
1893 }
1894 /*
1895 * Setup our local pointer to *fabric
1896 */
1897 tcm_vhost_fabric_configfs = fabric;
1898 pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n");
1899 return 0;
1900};
1901
1902static void tcm_vhost_deregister_configfs(void)
1903{
1904 if (!tcm_vhost_fabric_configfs)
1905 return;
1906
1907 target_fabric_configfs_deregister(tcm_vhost_fabric_configfs);
1908 tcm_vhost_fabric_configfs = NULL;
1909 pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n");
1910};
1911
1912static int __init tcm_vhost_init(void)
1913{
1914 int ret = -ENOMEM;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001915 /*
1916 * Use our own dedicated workqueue for submitting I/O into
1917 * target core to avoid contention within system_wq.
1918 */
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001919 tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0);
1920 if (!tcm_vhost_workqueue)
1921 goto out;
1922
1923 ret = vhost_scsi_register();
1924 if (ret < 0)
1925 goto out_destroy_workqueue;
1926
1927 ret = tcm_vhost_register_configfs();
1928 if (ret < 0)
1929 goto out_vhost_scsi_deregister;
1930
1931 return 0;
1932
1933out_vhost_scsi_deregister:
1934 vhost_scsi_deregister();
1935out_destroy_workqueue:
1936 destroy_workqueue(tcm_vhost_workqueue);
1937out:
1938 return ret;
1939};
1940
1941static void tcm_vhost_exit(void)
1942{
1943 tcm_vhost_deregister_configfs();
1944 vhost_scsi_deregister();
1945 destroy_workqueue(tcm_vhost_workqueue);
1946};
1947
1948MODULE_DESCRIPTION("TCM_VHOST series fabric driver");
1949MODULE_LICENSE("GPL");
1950module_init(tcm_vhost_init);
1951module_exit(tcm_vhost_exit);