blob: 7014202972259f4d7046d5f4a110fe9a0cedef37 [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>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070048#include <linux/virtio_scsi.h>
Asias He9d6064a2013-01-06 14:36:13 +080049#include <linux/llist.h>
Asias He1b7f3902013-02-06 13:20:59 +080050#include <linux/bitmap.h>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070051
52#include "vhost.c"
53#include "vhost.h"
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030054
55#define TCM_VHOST_VERSION "v0.1"
56#define TCM_VHOST_NAMELEN 256
57#define TCM_VHOST_MAX_CDB_SIZE 32
58
59struct vhost_scsi_inflight {
60 /* Wait for the flush operation to finish */
61 struct completion comp;
62 /* Refcount for the inflight reqs */
63 struct kref kref;
64};
65
66struct tcm_vhost_cmd {
67 /* Descriptor from vhost_get_vq_desc() for virt_queue segment */
68 int tvc_vq_desc;
69 /* virtio-scsi initiator task attribute */
70 int tvc_task_attr;
71 /* virtio-scsi initiator data direction */
72 enum dma_data_direction tvc_data_direction;
73 /* Expected data transfer length from virtio-scsi header */
74 u32 tvc_exp_data_len;
75 /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
76 u64 tvc_tag;
77 /* The number of scatterlists associated with this cmd */
78 u32 tvc_sgl_count;
79 /* Saved unpacked SCSI LUN for tcm_vhost_submission_work() */
80 u32 tvc_lun;
81 /* Pointer to the SGL formatted memory from virtio-scsi */
82 struct scatterlist *tvc_sgl;
83 /* Pointer to response */
84 struct virtio_scsi_cmd_resp __user *tvc_resp;
85 /* Pointer to vhost_scsi for our device */
86 struct vhost_scsi *tvc_vhost;
87 /* Pointer to vhost_virtqueue for the cmd */
88 struct vhost_virtqueue *tvc_vq;
89 /* Pointer to vhost nexus memory */
90 struct tcm_vhost_nexus *tvc_nexus;
91 /* The TCM I/O descriptor that is accessed via container_of() */
92 struct se_cmd tvc_se_cmd;
93 /* work item used for cmwq dispatch to tcm_vhost_submission_work() */
94 struct work_struct work;
95 /* Copy of the incoming SCSI command descriptor block (CDB) */
96 unsigned char tvc_cdb[TCM_VHOST_MAX_CDB_SIZE];
97 /* Sense buffer that will be mapped into outgoing status */
98 unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
99 /* Completed commands list, serviced from vhost worker thread */
100 struct llist_node tvc_completion_list;
101 /* Used to track inflight cmd */
102 struct vhost_scsi_inflight *inflight;
103};
104
105struct tcm_vhost_nexus {
106 /* Pointer to TCM session for I_T Nexus */
107 struct se_session *tvn_se_sess;
108};
109
110struct tcm_vhost_nacl {
111 /* Binary World Wide unique Port Name for Vhost Initiator port */
112 u64 iport_wwpn;
113 /* ASCII formatted WWPN for Sas Initiator port */
114 char iport_name[TCM_VHOST_NAMELEN];
115 /* Returned by tcm_vhost_make_nodeacl() */
116 struct se_node_acl se_node_acl;
117};
118
119struct vhost_scsi;
120struct tcm_vhost_tpg {
121 /* Vhost port target portal group tag for TCM */
122 u16 tport_tpgt;
123 /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
124 int tv_tpg_port_count;
125 /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
126 int tv_tpg_vhost_count;
127 /* list for tcm_vhost_list */
128 struct list_head tv_tpg_list;
129 /* Used to protect access for tpg_nexus */
130 struct mutex tv_tpg_mutex;
131 /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
132 struct tcm_vhost_nexus *tpg_nexus;
133 /* Pointer back to tcm_vhost_tport */
134 struct tcm_vhost_tport *tport;
135 /* Returned by tcm_vhost_make_tpg() */
136 struct se_portal_group se_tpg;
137 /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */
138 struct vhost_scsi *vhost_scsi;
139};
140
141struct tcm_vhost_tport {
142 /* SCSI protocol the tport is providing */
143 u8 tport_proto_id;
144 /* Binary World Wide unique Port Name for Vhost Target port */
145 u64 tport_wwpn;
146 /* ASCII formatted WWPN for Vhost Target port */
147 char tport_name[TCM_VHOST_NAMELEN];
148 /* Returned by tcm_vhost_make_tport() */
149 struct se_wwn tport_wwn;
150};
151
152struct tcm_vhost_evt {
153 /* event to be sent to guest */
154 struct virtio_scsi_event event;
155 /* event list, serviced from vhost worker thread */
156 struct llist_node list;
157};
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700158
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700159enum {
160 VHOST_SCSI_VQ_CTL = 0,
161 VHOST_SCSI_VQ_EVT = 1,
162 VHOST_SCSI_VQ_IO = 2,
163};
164
Nicholas Bellinger5dade712013-03-27 17:23:41 -0700165enum {
Asias Hea18cc422013-05-07 14:51:49 +0800166 VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG)
Nicholas Bellinger5dade712013-03-27 17:23:41 -0700167};
168
Asias He1b7f3902013-02-06 13:20:59 +0800169#define VHOST_SCSI_MAX_TARGET 256
170#define VHOST_SCSI_MAX_VQ 128
Asias Hea6c9af82013-04-25 15:35:21 +0800171#define VHOST_SCSI_MAX_EVENT 128
Asias He67e18cf2013-02-05 12:31:57 +0800172
Asias He3ab2e422013-04-27 11:16:48 +0800173struct vhost_scsi_virtqueue {
174 struct vhost_virtqueue vq;
Michael S. Tsirkin3dfbff32013-04-28 15:38:52 +0300175 /*
176 * Reference counting for inflight reqs, used for flush operation. At
177 * each time, one reference tracks new commands submitted, while we
178 * wait for another one to reach 0.
179 */
Asias Hef2f0173d2013-04-27 11:16:49 +0800180 struct vhost_scsi_inflight inflights[2];
Michael S. Tsirkin3dfbff32013-04-28 15:38:52 +0300181 /*
182 * Indicate current inflight in use, protected by vq->mutex.
183 * Writers must also take dev mutex and flush under it.
184 */
Asias Hef2f0173d2013-04-27 11:16:49 +0800185 int inflight_idx;
Asias He3ab2e422013-04-27 11:16:48 +0800186};
187
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700188struct vhost_scsi {
Asias He67e18cf2013-02-05 12:31:57 +0800189 /* Protected by vhost_scsi->dev.mutex */
Asias He4f7f46d2013-04-03 14:17:37 +0800190 struct tcm_vhost_tpg **vs_tpg;
Asias He67e18cf2013-02-05 12:31:57 +0800191 char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
Asias He67e18cf2013-02-05 12:31:57 +0800192
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700193 struct vhost_dev dev;
Asias He3ab2e422013-04-27 11:16:48 +0800194 struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ];
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700195
196 struct vhost_work vs_completion_work; /* cmd completion work item */
Asias He9d6064a2013-01-06 14:36:13 +0800197 struct llist_head vs_completion_list; /* cmd completion queue */
Asias Hea6c9af82013-04-25 15:35:21 +0800198
199 struct vhost_work vs_event_work; /* evt injection work item */
200 struct llist_head vs_event_list; /* evt injection queue */
201
202 bool vs_events_missed; /* any missed events, protected by vq->mutex */
203 int vs_events_nr; /* num of pending events, protected by vq->mutex */
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700204};
205
206/* Local pointer to allocated TCM configfs fabric module */
207static struct target_fabric_configfs *tcm_vhost_fabric_configfs;
208
209static struct workqueue_struct *tcm_vhost_workqueue;
210
211/* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */
212static DEFINE_MUTEX(tcm_vhost_mutex);
213static LIST_HEAD(tcm_vhost_list);
214
Asias He765b34f2013-01-22 11:20:25 +0800215static int iov_num_pages(struct iovec *iov)
216{
217 return (PAGE_ALIGN((unsigned long)iov->iov_base + iov->iov_len) -
218 ((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT;
219}
220
Asias Hef2f0173d2013-04-27 11:16:49 +0800221void tcm_vhost_done_inflight(struct kref *kref)
222{
223 struct vhost_scsi_inflight *inflight;
224
225 inflight = container_of(kref, struct vhost_scsi_inflight, kref);
226 complete(&inflight->comp);
227}
228
229static void tcm_vhost_init_inflight(struct vhost_scsi *vs,
230 struct vhost_scsi_inflight *old_inflight[])
231{
232 struct vhost_scsi_inflight *new_inflight;
233 struct vhost_virtqueue *vq;
234 int idx, i;
235
236 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
237 vq = &vs->vqs[i].vq;
238
239 mutex_lock(&vq->mutex);
240
241 /* store old infight */
242 idx = vs->vqs[i].inflight_idx;
243 if (old_inflight)
244 old_inflight[i] = &vs->vqs[i].inflights[idx];
245
246 /* setup new infight */
247 vs->vqs[i].inflight_idx = idx ^ 1;
248 new_inflight = &vs->vqs[i].inflights[idx ^ 1];
249 kref_init(&new_inflight->kref);
250 init_completion(&new_inflight->comp);
251
252 mutex_unlock(&vq->mutex);
253 }
254}
255
256static struct vhost_scsi_inflight *
257tcm_vhost_get_inflight(struct vhost_virtqueue *vq)
258{
259 struct vhost_scsi_inflight *inflight;
260 struct vhost_scsi_virtqueue *svq;
261
262 svq = container_of(vq, struct vhost_scsi_virtqueue, vq);
263 inflight = &svq->inflights[svq->inflight_idx];
264 kref_get(&inflight->kref);
265
266 return inflight;
267}
268
269static void tcm_vhost_put_inflight(struct vhost_scsi_inflight *inflight)
270{
271 kref_put(&inflight->kref, tcm_vhost_done_inflight);
272}
273
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700274static int tcm_vhost_check_true(struct se_portal_group *se_tpg)
275{
276 return 1;
277}
278
279static int tcm_vhost_check_false(struct se_portal_group *se_tpg)
280{
281 return 0;
282}
283
284static char *tcm_vhost_get_fabric_name(void)
285{
286 return "vhost";
287}
288
289static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg)
290{
291 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
292 struct tcm_vhost_tpg, se_tpg);
293 struct tcm_vhost_tport *tport = tpg->tport;
294
295 switch (tport->tport_proto_id) {
296 case SCSI_PROTOCOL_SAS:
297 return sas_get_fabric_proto_ident(se_tpg);
298 case SCSI_PROTOCOL_FCP:
299 return fc_get_fabric_proto_ident(se_tpg);
300 case SCSI_PROTOCOL_ISCSI:
301 return iscsi_get_fabric_proto_ident(se_tpg);
302 default:
303 pr_err("Unknown tport_proto_id: 0x%02x, using"
304 " SAS emulation\n", tport->tport_proto_id);
305 break;
306 }
307
308 return sas_get_fabric_proto_ident(se_tpg);
309}
310
311static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg)
312{
313 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
314 struct tcm_vhost_tpg, se_tpg);
315 struct tcm_vhost_tport *tport = tpg->tport;
316
317 return &tport->tport_name[0];
318}
319
320static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg)
321{
322 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
323 struct tcm_vhost_tpg, se_tpg);
324 return tpg->tport_tpgt;
325}
326
327static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg)
328{
329 return 1;
330}
331
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700332static u32 tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700333 struct se_node_acl *se_nacl,
334 struct t10_pr_registration *pr_reg,
335 int *format_code,
336 unsigned char *buf)
337{
338 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
339 struct tcm_vhost_tpg, se_tpg);
340 struct tcm_vhost_tport *tport = tpg->tport;
341
342 switch (tport->tport_proto_id) {
343 case SCSI_PROTOCOL_SAS:
344 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
345 format_code, buf);
346 case SCSI_PROTOCOL_FCP:
347 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
348 format_code, buf);
349 case SCSI_PROTOCOL_ISCSI:
350 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
351 format_code, buf);
352 default:
353 pr_err("Unknown tport_proto_id: 0x%02x, using"
354 " SAS emulation\n", tport->tport_proto_id);
355 break;
356 }
357
358 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
359 format_code, buf);
360}
361
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700362static u32 tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700363 struct se_node_acl *se_nacl,
364 struct t10_pr_registration *pr_reg,
365 int *format_code)
366{
367 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
368 struct tcm_vhost_tpg, se_tpg);
369 struct tcm_vhost_tport *tport = tpg->tport;
370
371 switch (tport->tport_proto_id) {
372 case SCSI_PROTOCOL_SAS:
373 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
374 format_code);
375 case SCSI_PROTOCOL_FCP:
376 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
377 format_code);
378 case SCSI_PROTOCOL_ISCSI:
379 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
380 format_code);
381 default:
382 pr_err("Unknown tport_proto_id: 0x%02x, using"
383 " SAS emulation\n", tport->tport_proto_id);
384 break;
385 }
386
387 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
388 format_code);
389}
390
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700391static char *tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700392 const char *buf,
393 u32 *out_tid_len,
394 char **port_nexus_ptr)
395{
396 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
397 struct tcm_vhost_tpg, se_tpg);
398 struct tcm_vhost_tport *tport = tpg->tport;
399
400 switch (tport->tport_proto_id) {
401 case SCSI_PROTOCOL_SAS:
402 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
403 port_nexus_ptr);
404 case SCSI_PROTOCOL_FCP:
405 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
406 port_nexus_ptr);
407 case SCSI_PROTOCOL_ISCSI:
408 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
409 port_nexus_ptr);
410 default:
411 pr_err("Unknown tport_proto_id: 0x%02x, using"
412 " SAS emulation\n", tport->tport_proto_id);
413 break;
414 }
415
416 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
417 port_nexus_ptr);
418}
419
420static struct se_node_acl *tcm_vhost_alloc_fabric_acl(
421 struct se_portal_group *se_tpg)
422{
423 struct tcm_vhost_nacl *nacl;
424
425 nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL);
426 if (!nacl) {
Masanari Iida744627e92012-11-05 23:30:40 +0900427 pr_err("Unable to allocate struct tcm_vhost_nacl\n");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700428 return NULL;
429 }
430
431 return &nacl->se_node_acl;
432}
433
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700434static void tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700435 struct se_node_acl *se_nacl)
436{
437 struct tcm_vhost_nacl *nacl = container_of(se_nacl,
438 struct tcm_vhost_nacl, se_node_acl);
439 kfree(nacl);
440}
441
442static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg)
443{
444 return 1;
445}
446
447static void tcm_vhost_release_cmd(struct se_cmd *se_cmd)
448{
449 return;
450}
451
452static int tcm_vhost_shutdown_session(struct se_session *se_sess)
453{
454 return 0;
455}
456
457static void tcm_vhost_close_session(struct se_session *se_sess)
458{
459 return;
460}
461
462static u32 tcm_vhost_sess_get_index(struct se_session *se_sess)
463{
464 return 0;
465}
466
467static int tcm_vhost_write_pending(struct se_cmd *se_cmd)
468{
469 /* Go ahead and process the write immediately */
470 target_execute_cmd(se_cmd);
471 return 0;
472}
473
474static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd)
475{
476 return 0;
477}
478
479static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl)
480{
481 return;
482}
483
484static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd)
485{
486 return 0;
487}
488
489static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd)
490{
491 return 0;
492}
493
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700494static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *tv_cmd)
495{
496 struct vhost_scsi *vs = tv_cmd->tvc_vhost;
497
Asias He9d6064a2013-01-06 14:36:13 +0800498 llist_add(&tv_cmd->tvc_completion_list, &vs->vs_completion_list);
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700499
500 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
501}
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700502
503static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd)
504{
505 struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
506 struct tcm_vhost_cmd, tvc_se_cmd);
507 vhost_scsi_complete_cmd(tv_cmd);
508 return 0;
509}
510
511static int tcm_vhost_queue_status(struct se_cmd *se_cmd)
512{
513 struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
514 struct tcm_vhost_cmd, tvc_se_cmd);
515 vhost_scsi_complete_cmd(tv_cmd);
516 return 0;
517}
518
519static int tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd)
520{
521 return 0;
522}
523
Asias Hea6c9af82013-04-25 15:35:21 +0800524static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt)
525{
526 vs->vs_events_nr--;
527 kfree(evt);
528}
529
530static struct tcm_vhost_evt *tcm_vhost_allocate_evt(struct vhost_scsi *vs,
531 u32 event, u32 reason)
532{
Asias He3ab2e422013-04-27 11:16:48 +0800533 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +0800534 struct tcm_vhost_evt *evt;
535
536 if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
537 vs->vs_events_missed = true;
538 return NULL;
539 }
540
541 evt = kzalloc(sizeof(*evt), GFP_KERNEL);
542 if (!evt) {
543 vq_err(vq, "Failed to allocate tcm_vhost_evt\n");
544 vs->vs_events_missed = true;
545 return NULL;
546 }
547
548 evt->event.event = event;
549 evt->event.reason = reason;
550 vs->vs_events_nr++;
551
552 return evt;
553}
554
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700555static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd)
556{
557 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
558
559 /* TODO locking against target/backend threads? */
560 transport_generic_free_cmd(se_cmd, 1);
561
562 if (tv_cmd->tvc_sgl_count) {
563 u32 i;
564 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
565 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
566
567 kfree(tv_cmd->tvc_sgl);
568 }
569
Asias Hef2f0173d2013-04-27 11:16:49 +0800570 tcm_vhost_put_inflight(tv_cmd->inflight);
571
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700572 kfree(tv_cmd);
573}
574
Asias Hea6c9af82013-04-25 15:35:21 +0800575static void tcm_vhost_do_evt_work(struct vhost_scsi *vs,
576 struct tcm_vhost_evt *evt)
577{
Asias He3ab2e422013-04-27 11:16:48 +0800578 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +0800579 struct virtio_scsi_event *event = &evt->event;
580 struct virtio_scsi_event __user *eventp;
581 unsigned out, in;
582 int head, ret;
583
584 if (!vq->private_data) {
585 vs->vs_events_missed = true;
586 return;
587 }
588
589again:
590 vhost_disable_notify(&vs->dev, vq);
591 head = vhost_get_vq_desc(&vs->dev, vq, vq->iov,
592 ARRAY_SIZE(vq->iov), &out, &in,
593 NULL, NULL);
594 if (head < 0) {
595 vs->vs_events_missed = true;
596 return;
597 }
598 if (head == vq->num) {
599 if (vhost_enable_notify(&vs->dev, vq))
600 goto again;
601 vs->vs_events_missed = true;
602 return;
603 }
604
605 if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
606 vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
607 vq->iov[out].iov_len);
608 vs->vs_events_missed = true;
609 return;
610 }
611
612 if (vs->vs_events_missed) {
613 event->event |= VIRTIO_SCSI_T_EVENTS_MISSED;
614 vs->vs_events_missed = false;
615 }
616
617 eventp = vq->iov[out].iov_base;
618 ret = __copy_to_user(eventp, event, sizeof(*event));
619 if (!ret)
620 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
621 else
622 vq_err(vq, "Faulted on tcm_vhost_send_event\n");
623}
624
625static void tcm_vhost_evt_work(struct vhost_work *work)
626{
627 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
628 vs_event_work);
Asias He3ab2e422013-04-27 11:16:48 +0800629 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +0800630 struct tcm_vhost_evt *evt;
631 struct llist_node *llnode;
632
633 mutex_lock(&vq->mutex);
634 llnode = llist_del_all(&vs->vs_event_list);
635 while (llnode) {
636 evt = llist_entry(llnode, struct tcm_vhost_evt, list);
637 llnode = llist_next(llnode);
638 tcm_vhost_do_evt_work(vs, evt);
639 tcm_vhost_free_evt(vs, evt);
640 }
641 mutex_unlock(&vq->mutex);
642}
643
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700644/* Fill in status and signal that we are done processing this command
645 *
646 * This is scheduled in the vhost work queue so we are called with the owner
647 * process mm and can access the vring.
648 */
649static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
650{
651 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
652 vs_completion_work);
Asias He1b7f3902013-02-06 13:20:59 +0800653 DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
Asias He9d6064a2013-01-06 14:36:13 +0800654 struct virtio_scsi_cmd_resp v_rsp;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700655 struct tcm_vhost_cmd *tv_cmd;
Asias He9d6064a2013-01-06 14:36:13 +0800656 struct llist_node *llnode;
657 struct se_cmd *se_cmd;
Asias He1b7f3902013-02-06 13:20:59 +0800658 int ret, vq;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700659
Asias He1b7f3902013-02-06 13:20:59 +0800660 bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
Asias He9d6064a2013-01-06 14:36:13 +0800661 llnode = llist_del_all(&vs->vs_completion_list);
662 while (llnode) {
663 tv_cmd = llist_entry(llnode, struct tcm_vhost_cmd,
664 tvc_completion_list);
665 llnode = llist_next(llnode);
666 se_cmd = &tv_cmd->tvc_se_cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700667
668 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
669 tv_cmd, se_cmd->residual_count, se_cmd->scsi_status);
670
671 memset(&v_rsp, 0, sizeof(v_rsp));
672 v_rsp.resid = se_cmd->residual_count;
673 /* TODO is status_qualifier field needed? */
674 v_rsp.status = se_cmd->scsi_status;
675 v_rsp.sense_len = se_cmd->scsi_sense_length;
676 memcpy(v_rsp.sense, tv_cmd->tvc_sense_buf,
677 v_rsp.sense_len);
678 ret = copy_to_user(tv_cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
Asias He1b7f3902013-02-06 13:20:59 +0800679 if (likely(ret == 0)) {
Asias He3ab2e422013-04-27 11:16:48 +0800680 struct vhost_scsi_virtqueue *q;
Asias He1b7f3902013-02-06 13:20:59 +0800681 vhost_add_used(tv_cmd->tvc_vq, tv_cmd->tvc_vq_desc, 0);
Asias He3ab2e422013-04-27 11:16:48 +0800682 q = container_of(tv_cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
683 vq = q - vs->vqs;
Asias He1b7f3902013-02-06 13:20:59 +0800684 __set_bit(vq, signal);
685 } else
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700686 pr_err("Faulted on virtio_scsi_cmd_resp\n");
687
688 vhost_scsi_free_cmd(tv_cmd);
689 }
690
Asias He1b7f3902013-02-06 13:20:59 +0800691 vq = -1;
692 while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
693 < VHOST_SCSI_MAX_VQ)
Asias He3ab2e422013-04-27 11:16:48 +0800694 vhost_signal(&vs->dev, &vs->vqs[vq].vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700695}
696
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700697static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd(
Asias Hef2f0173d2013-04-27 11:16:49 +0800698 struct vhost_virtqueue *vq,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700699 struct tcm_vhost_tpg *tv_tpg,
700 struct virtio_scsi_cmd_req *v_req,
701 u32 exp_data_len,
702 int data_direction)
703{
704 struct tcm_vhost_cmd *tv_cmd;
705 struct tcm_vhost_nexus *tv_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700706
707 tv_nexus = tv_tpg->tpg_nexus;
708 if (!tv_nexus) {
709 pr_err("Unable to locate active struct tcm_vhost_nexus\n");
710 return ERR_PTR(-EIO);
711 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700712
713 tv_cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC);
714 if (!tv_cmd) {
715 pr_err("Unable to allocate struct tcm_vhost_cmd\n");
716 return ERR_PTR(-ENOMEM);
717 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700718 tv_cmd->tvc_tag = v_req->tag;
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700719 tv_cmd->tvc_task_attr = v_req->task_attr;
720 tv_cmd->tvc_exp_data_len = exp_data_len;
721 tv_cmd->tvc_data_direction = data_direction;
722 tv_cmd->tvc_nexus = tv_nexus;
Asias Hef2f0173d2013-04-27 11:16:49 +0800723 tv_cmd->inflight = tcm_vhost_get_inflight(vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700724
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700725 return tv_cmd;
726}
727
728/*
729 * Map a user memory range into a scatterlist
730 *
731 * Returns the number of scatterlist entries used or -errno on error.
732 */
733static int vhost_scsi_map_to_sgl(struct scatterlist *sgl,
Asias He18100532013-01-22 11:20:27 +0800734 unsigned int sgl_count, struct iovec *iov, int write)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700735{
Asias He18100532013-01-22 11:20:27 +0800736 unsigned int npages = 0, pages_nr, offset, nbytes;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700737 struct scatterlist *sg = sgl;
Asias He18100532013-01-22 11:20:27 +0800738 void __user *ptr = iov->iov_base;
739 size_t len = iov->iov_len;
740 struct page **pages;
741 int ret, i;
742
743 pages_nr = iov_num_pages(iov);
744 if (pages_nr > sgl_count)
745 return -ENOBUFS;
746
747 pages = kmalloc(pages_nr * sizeof(struct page *), GFP_KERNEL);
748 if (!pages)
749 return -ENOMEM;
750
751 ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
752 /* No pages were pinned */
753 if (ret < 0)
754 goto out;
755 /* Less pages pinned than wanted */
756 if (ret != pages_nr) {
757 for (i = 0; i < ret; i++)
758 put_page(pages[i]);
759 ret = -EFAULT;
760 goto out;
761 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700762
763 while (len > 0) {
Asias He18100532013-01-22 11:20:27 +0800764 offset = (uintptr_t)ptr & ~PAGE_MASK;
765 nbytes = min_t(unsigned int, PAGE_SIZE - offset, len);
766 sg_set_page(sg, pages[npages], nbytes, offset);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700767 ptr += nbytes;
768 len -= nbytes;
769 sg++;
770 npages++;
771 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700772
Asias He18100532013-01-22 11:20:27 +0800773out:
774 kfree(pages);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700775 return ret;
776}
777
778static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd,
779 struct iovec *iov, unsigned int niov, int write)
780{
781 int ret;
782 unsigned int i;
783 u32 sgl_count;
784 struct scatterlist *sg;
785
786 /*
787 * Find out how long sglist needs to be
788 */
789 sgl_count = 0;
Asias Hef3158f32013-01-22 11:20:26 +0800790 for (i = 0; i < niov; i++)
791 sgl_count += iov_num_pages(&iov[i]);
792
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700793 /* TODO overflow checking */
794
795 sg = kmalloc(sizeof(tv_cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC);
796 if (!sg)
797 return -ENOMEM;
Fengguang Wuf0e0e9b2012-07-30 13:19:07 -0700798 pr_debug("%s sg %p sgl_count %u is_err %d\n", __func__,
799 sg, sgl_count, !sg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700800 sg_init_table(sg, sgl_count);
801
802 tv_cmd->tvc_sgl = sg;
803 tv_cmd->tvc_sgl_count = sgl_count;
804
805 pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count);
806 for (i = 0; i < niov; i++) {
Asias He18100532013-01-22 11:20:27 +0800807 ret = vhost_scsi_map_to_sgl(sg, sgl_count, &iov[i], write);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700808 if (ret < 0) {
809 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
810 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
811 kfree(tv_cmd->tvc_sgl);
812 tv_cmd->tvc_sgl = NULL;
813 tv_cmd->tvc_sgl_count = 0;
814 return ret;
815 }
816
817 sg += ret;
818 sgl_count -= ret;
819 }
820 return 0;
821}
822
823static void tcm_vhost_submission_work(struct work_struct *work)
824{
825 struct tcm_vhost_cmd *tv_cmd =
826 container_of(work, struct tcm_vhost_cmd, work);
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700827 struct tcm_vhost_nexus *tv_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700828 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
829 struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL;
830 int rc, sg_no_bidi = 0;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700831
832 if (tv_cmd->tvc_sgl_count) {
833 sg_ptr = tv_cmd->tvc_sgl;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700834/* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */
835#if 0
836 if (se_cmd->se_cmd_flags & SCF_BIDI) {
837 sg_bidi_ptr = NULL;
838 sg_no_bidi = 0;
839 }
840#endif
841 } else {
842 sg_ptr = NULL;
843 }
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700844 tv_nexus = tv_cmd->tvc_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700845
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700846 rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
847 tv_cmd->tvc_cdb, &tv_cmd->tvc_sense_buf[0],
848 tv_cmd->tvc_lun, tv_cmd->tvc_exp_data_len,
849 tv_cmd->tvc_task_attr, tv_cmd->tvc_data_direction,
850 0, sg_ptr, tv_cmd->tvc_sgl_count,
851 sg_bidi_ptr, sg_no_bidi);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700852 if (rc < 0) {
853 transport_send_check_condition_and_sense(se_cmd,
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700854 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700855 transport_generic_free_cmd(se_cmd, 0);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700856 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700857}
858
Asias He637ab212013-04-10 15:06:15 +0800859static void vhost_scsi_send_bad_target(struct vhost_scsi *vs,
860 struct vhost_virtqueue *vq, int head, unsigned out)
861{
862 struct virtio_scsi_cmd_resp __user *resp;
863 struct virtio_scsi_cmd_resp rsp;
864 int ret;
865
866 memset(&rsp, 0, sizeof(rsp));
867 rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
868 resp = vq->iov[out].iov_base;
869 ret = __copy_to_user(resp, &rsp, sizeof(rsp));
870 if (!ret)
871 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
872 else
873 pr_err("Faulted on virtio_scsi_cmd_resp\n");
874}
875
Asias He1b7f3902013-02-06 13:20:59 +0800876static void vhost_scsi_handle_vq(struct vhost_scsi *vs,
877 struct vhost_virtqueue *vq)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700878{
Asias He4f7f46d2013-04-03 14:17:37 +0800879 struct tcm_vhost_tpg **vs_tpg;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700880 struct virtio_scsi_cmd_req v_req;
881 struct tcm_vhost_tpg *tv_tpg;
882 struct tcm_vhost_cmd *tv_cmd;
883 u32 exp_data_len, data_first, data_num, data_direction;
884 unsigned out, in, i;
885 int head, ret;
Asias He67e18cf2013-02-05 12:31:57 +0800886 u8 target;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700887
Asias He4f7f46d2013-04-03 14:17:37 +0800888 /*
889 * We can handle the vq only after the endpoint is setup by calling the
890 * VHOST_SCSI_SET_ENDPOINT ioctl.
891 *
892 * TODO: Check that we are running from vhost_worker which acts
893 * as read-side critical section for vhost kind of RCU.
894 * See the comments in struct vhost_virtqueue in drivers/vhost/vhost.h
895 */
896 vs_tpg = rcu_dereference_check(vq->private_data, 1);
897 if (!vs_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700898 return;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700899
900 mutex_lock(&vq->mutex);
901 vhost_disable_notify(&vs->dev, vq);
902
903 for (;;) {
904 head = vhost_get_vq_desc(&vs->dev, vq, vq->iov,
905 ARRAY_SIZE(vq->iov), &out, &in,
906 NULL, NULL);
907 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
908 head, out, in);
909 /* On error, stop handling until the next kick. */
910 if (unlikely(head < 0))
911 break;
912 /* Nothing new? Wait for eventfd to tell us they refilled. */
913 if (head == vq->num) {
914 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
915 vhost_disable_notify(&vs->dev, vq);
916 continue;
917 }
918 break;
919 }
920
921/* FIXME: BIDI operation */
922 if (out == 1 && in == 1) {
923 data_direction = DMA_NONE;
924 data_first = 0;
925 data_num = 0;
926 } else if (out == 1 && in > 1) {
927 data_direction = DMA_FROM_DEVICE;
928 data_first = out + 1;
929 data_num = in - 1;
930 } else if (out > 1 && in == 1) {
931 data_direction = DMA_TO_DEVICE;
932 data_first = 1;
933 data_num = out - 1;
934 } else {
935 vq_err(vq, "Invalid buffer layout out: %u in: %u\n",
936 out, in);
937 break;
938 }
939
940 /*
941 * Check for a sane resp buffer so we can report errors to
942 * the guest.
943 */
944 if (unlikely(vq->iov[out].iov_len !=
945 sizeof(struct virtio_scsi_cmd_resp))) {
946 vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
947 " bytes\n", vq->iov[out].iov_len);
948 break;
949 }
950
951 if (unlikely(vq->iov[0].iov_len != sizeof(v_req))) {
952 vq_err(vq, "Expecting virtio_scsi_cmd_req, got %zu"
953 " bytes\n", vq->iov[0].iov_len);
954 break;
955 }
956 pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p,"
957 " len: %zu\n", vq->iov[0].iov_base, sizeof(v_req));
958 ret = __copy_from_user(&v_req, vq->iov[0].iov_base,
959 sizeof(v_req));
960 if (unlikely(ret)) {
961 vq_err(vq, "Faulted on virtio_scsi_cmd_req\n");
962 break;
963 }
964
Asias He67e18cf2013-02-05 12:31:57 +0800965 /* Extract the tpgt */
966 target = v_req.lun[1];
Asias He4f7f46d2013-04-03 14:17:37 +0800967 tv_tpg = ACCESS_ONCE(vs_tpg[target]);
Asias He67e18cf2013-02-05 12:31:57 +0800968
969 /* Target does not exist, fail the request */
970 if (unlikely(!tv_tpg)) {
Asias He637ab212013-04-10 15:06:15 +0800971 vhost_scsi_send_bad_target(vs, vq, head, out);
Asias He67e18cf2013-02-05 12:31:57 +0800972 continue;
973 }
974
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700975 exp_data_len = 0;
976 for (i = 0; i < data_num; i++)
977 exp_data_len += vq->iov[data_first + i].iov_len;
978
Asias Hef2f0173d2013-04-27 11:16:49 +0800979 tv_cmd = vhost_scsi_allocate_cmd(vq, tv_tpg, &v_req,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700980 exp_data_len, data_direction);
981 if (IS_ERR(tv_cmd)) {
982 vq_err(vq, "vhost_scsi_allocate_cmd failed %ld\n",
983 PTR_ERR(tv_cmd));
Asias He055f6482013-04-10 15:06:16 +0800984 goto err_cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700985 }
986 pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
987 ": %d\n", tv_cmd, exp_data_len, data_direction);
988
989 tv_cmd->tvc_vhost = vs;
Asias He1b7f3902013-02-06 13:20:59 +0800990 tv_cmd->tvc_vq = vq;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700991 tv_cmd->tvc_resp = vq->iov[out].iov_base;
992
993 /*
994 * Copy in the recieved CDB descriptor into tv_cmd->tvc_cdb
995 * that will be used by tcm_vhost_new_cmd_map() and down into
996 * target_setup_cmd_from_cdb()
997 */
998 memcpy(tv_cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE);
999 /*
1000 * Check that the recieved CDB size does not exceeded our
1001 * hardcoded max for tcm_vhost
1002 */
1003 /* TODO what if cdb was too small for varlen cdb header? */
1004 if (unlikely(scsi_command_size(tv_cmd->tvc_cdb) >
1005 TCM_VHOST_MAX_CDB_SIZE)) {
1006 vq_err(vq, "Received SCSI CDB with command_size: %d that"
1007 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1008 scsi_command_size(tv_cmd->tvc_cdb),
1009 TCM_VHOST_MAX_CDB_SIZE);
Asias He055f6482013-04-10 15:06:16 +08001010 goto err_free;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001011 }
1012 tv_cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
1013
1014 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
1015 tv_cmd->tvc_cdb[0], tv_cmd->tvc_lun);
1016
1017 if (data_direction != DMA_NONE) {
1018 ret = vhost_scsi_map_iov_to_sgl(tv_cmd,
1019 &vq->iov[data_first], data_num,
1020 data_direction == DMA_TO_DEVICE);
1021 if (unlikely(ret)) {
1022 vq_err(vq, "Failed to map iov to sgl\n");
Asias He055f6482013-04-10 15:06:16 +08001023 goto err_free;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001024 }
1025 }
1026
1027 /*
1028 * Save the descriptor from vhost_get_vq_desc() to be used to
1029 * complete the virtio-scsi request in TCM callback context via
1030 * tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
1031 */
1032 tv_cmd->tvc_vq_desc = head;
1033 /*
1034 * Dispatch tv_cmd descriptor for cmwq execution in process
1035 * context provided by tcm_vhost_workqueue. This also ensures
1036 * tv_cmd is executed on the same kworker CPU as this vhost
1037 * thread to gain positive L2 cache locality effects..
1038 */
1039 INIT_WORK(&tv_cmd->work, tcm_vhost_submission_work);
1040 queue_work(tcm_vhost_workqueue, &tv_cmd->work);
1041 }
1042
1043 mutex_unlock(&vq->mutex);
Asias He7ea206c2013-04-10 15:06:14 +08001044 return;
1045
Asias He055f6482013-04-10 15:06:16 +08001046err_free:
Asias He7ea206c2013-04-10 15:06:14 +08001047 vhost_scsi_free_cmd(tv_cmd);
Asias He055f6482013-04-10 15:06:16 +08001048err_cmd:
1049 vhost_scsi_send_bad_target(vs, vq, head, out);
Asias He7ea206c2013-04-10 15:06:14 +08001050 mutex_unlock(&vq->mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001051}
1052
1053static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
1054{
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001055 pr_debug("%s: The handling func for control queue.\n", __func__);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001056}
1057
Asias Hea6c9af82013-04-25 15:35:21 +08001058static void tcm_vhost_send_evt(struct vhost_scsi *vs, struct tcm_vhost_tpg *tpg,
1059 struct se_lun *lun, u32 event, u32 reason)
1060{
1061 struct tcm_vhost_evt *evt;
1062
1063 evt = tcm_vhost_allocate_evt(vs, event, reason);
1064 if (!evt)
1065 return;
1066
1067 if (tpg && lun) {
1068 /* TODO: share lun setup code with virtio-scsi.ko */
1069 /*
1070 * Note: evt->event is zeroed when we allocate it and
1071 * lun[4-7] need to be zero according to virtio-scsi spec.
1072 */
1073 evt->event.lun[0] = 0x01;
1074 evt->event.lun[1] = tpg->tport_tpgt & 0xFF;
1075 if (lun->unpacked_lun >= 256)
1076 evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
1077 evt->event.lun[3] = lun->unpacked_lun & 0xFF;
1078 }
1079
1080 llist_add(&evt->list, &vs->vs_event_list);
1081 vhost_work_queue(&vs->dev, &vs->vs_event_work);
1082}
1083
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001084static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
1085{
Asias Hea6c9af82013-04-25 15:35:21 +08001086 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1087 poll.work);
1088 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1089
1090 mutex_lock(&vq->mutex);
1091 if (!vq->private_data)
1092 goto out;
1093
1094 if (vs->vs_events_missed)
1095 tcm_vhost_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
1096out:
1097 mutex_unlock(&vq->mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001098}
1099
1100static void vhost_scsi_handle_kick(struct vhost_work *work)
1101{
1102 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1103 poll.work);
1104 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1105
Asias He1b7f3902013-02-06 13:20:59 +08001106 vhost_scsi_handle_vq(vs, vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001107}
1108
Asias He4f7f46d2013-04-03 14:17:37 +08001109static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
1110{
Asias He3ab2e422013-04-27 11:16:48 +08001111 vhost_poll_flush(&vs->vqs[index].vq.poll);
Asias He4f7f46d2013-04-03 14:17:37 +08001112}
1113
Michael S. Tsirkin3dfbff32013-04-28 15:38:52 +03001114/* Callers must hold dev mutex */
Asias He4f7f46d2013-04-03 14:17:37 +08001115static void vhost_scsi_flush(struct vhost_scsi *vs)
1116{
Asias Hef2f0173d2013-04-27 11:16:49 +08001117 struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];
Asias He4f7f46d2013-04-03 14:17:37 +08001118 int i;
1119
Asias Hef2f0173d2013-04-27 11:16:49 +08001120 /* Init new inflight and remember the old inflight */
1121 tcm_vhost_init_inflight(vs, old_inflight);
1122
1123 /*
1124 * The inflight->kref was initialized to 1. We decrement it here to
1125 * indicate the start of the flush operation so that it will reach 0
1126 * when all the reqs are finished.
1127 */
1128 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1129 kref_put(&old_inflight[i]->kref, tcm_vhost_done_inflight);
1130
1131 /* Flush both the vhost poll and vhost work */
Asias He4f7f46d2013-04-03 14:17:37 +08001132 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1133 vhost_scsi_flush_vq(vs, i);
1134 vhost_work_flush(&vs->dev, &vs->vs_completion_work);
Asias Hea6c9af82013-04-25 15:35:21 +08001135 vhost_work_flush(&vs->dev, &vs->vs_event_work);
Asias Hef2f0173d2013-04-27 11:16:49 +08001136
1137 /* Wait for all reqs issued before the flush to be finished */
1138 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1139 wait_for_completion(&old_inflight[i]->comp);
Asias He4f7f46d2013-04-03 14:17:37 +08001140}
1141
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001142/*
1143 * Called from vhost_scsi_ioctl() context to walk the list of available
1144 * tcm_vhost_tpg with an active struct tcm_vhost_nexus
Asias Hef2b7daf2013-04-25 15:35:20 +08001145 *
1146 * The lock nesting rule is:
1147 * tcm_vhost_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001148 */
1149static int vhost_scsi_set_endpoint(
1150 struct vhost_scsi *vs,
1151 struct vhost_scsi_target *t)
1152{
1153 struct tcm_vhost_tport *tv_tport;
1154 struct tcm_vhost_tpg *tv_tpg;
Asias He4f7f46d2013-04-03 14:17:37 +08001155 struct tcm_vhost_tpg **vs_tpg;
1156 struct vhost_virtqueue *vq;
1157 int index, ret, i, len;
Asias He67e18cf2013-02-05 12:31:57 +08001158 bool match = false;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001159
Asias Hef2b7daf2013-04-25 15:35:20 +08001160 mutex_lock(&tcm_vhost_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001161 mutex_lock(&vs->dev.mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001162
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001163 /* Verify that ring has been setup correctly. */
1164 for (index = 0; index < vs->dev.nvqs; ++index) {
1165 /* Verify that ring has been setup correctly. */
Asias He3ab2e422013-04-27 11:16:48 +08001166 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
Asias Hef2b7daf2013-04-25 15:35:20 +08001167 ret = -EFAULT;
1168 goto out;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001169 }
1170 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001171
Asias He4f7f46d2013-04-03 14:17:37 +08001172 len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
1173 vs_tpg = kzalloc(len, GFP_KERNEL);
1174 if (!vs_tpg) {
Asias Hef2b7daf2013-04-25 15:35:20 +08001175 ret = -ENOMEM;
1176 goto out;
Asias He4f7f46d2013-04-03 14:17:37 +08001177 }
1178 if (vs->vs_tpg)
1179 memcpy(vs_tpg, vs->vs_tpg, len);
1180
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001181 list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) {
1182 mutex_lock(&tv_tpg->tv_tpg_mutex);
1183 if (!tv_tpg->tpg_nexus) {
1184 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1185 continue;
1186 }
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001187 if (tv_tpg->tv_tpg_vhost_count != 0) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001188 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1189 continue;
1190 }
1191 tv_tport = tv_tpg->tport;
1192
Asias He67e18cf2013-02-05 12:31:57 +08001193 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
Asias He4f7f46d2013-04-03 14:17:37 +08001194 if (vs->vs_tpg && vs->vs_tpg[tv_tpg->tport_tpgt]) {
Asias He4f7f46d2013-04-03 14:17:37 +08001195 kfree(vs_tpg);
Asias Hef2b7daf2013-04-25 15:35:20 +08001196 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1197 ret = -EEXIST;
1198 goto out;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001199 }
Asias He67e18cf2013-02-05 12:31:57 +08001200 tv_tpg->tv_tpg_vhost_count++;
Asias Hea6c9af82013-04-25 15:35:21 +08001201 tv_tpg->vhost_scsi = vs;
Asias He4f7f46d2013-04-03 14:17:37 +08001202 vs_tpg[tv_tpg->tport_tpgt] = tv_tpg;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001203 smp_mb__after_atomic_inc();
Asias He67e18cf2013-02-05 12:31:57 +08001204 match = true;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001205 }
1206 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1207 }
Asias He67e18cf2013-02-05 12:31:57 +08001208
1209 if (match) {
1210 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1211 sizeof(vs->vs_vhost_wwpn));
Asias He4f7f46d2013-04-03 14:17:37 +08001212 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
Asias He3ab2e422013-04-27 11:16:48 +08001213 vq = &vs->vqs[i].vq;
Asias He4f7f46d2013-04-03 14:17:37 +08001214 /* Flushing the vhost_work acts as synchronize_rcu */
1215 mutex_lock(&vq->mutex);
1216 rcu_assign_pointer(vq->private_data, vs_tpg);
Asias Hedfd5d562013-04-03 14:17:38 +08001217 vhost_init_used(vq);
Asias He4f7f46d2013-04-03 14:17:37 +08001218 mutex_unlock(&vq->mutex);
1219 }
Asias He67e18cf2013-02-05 12:31:57 +08001220 ret = 0;
1221 } else {
1222 ret = -EEXIST;
1223 }
1224
Asias He4f7f46d2013-04-03 14:17:37 +08001225 /*
1226 * Act as synchronize_rcu to make sure access to
1227 * old vs->vs_tpg is finished.
1228 */
1229 vhost_scsi_flush(vs);
1230 kfree(vs->vs_tpg);
1231 vs->vs_tpg = vs_tpg;
1232
Asias Hef2b7daf2013-04-25 15:35:20 +08001233out:
Asias He67e18cf2013-02-05 12:31:57 +08001234 mutex_unlock(&vs->dev.mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001235 mutex_unlock(&tcm_vhost_mutex);
Asias He67e18cf2013-02-05 12:31:57 +08001236 return ret;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001237}
1238
1239static int vhost_scsi_clear_endpoint(
1240 struct vhost_scsi *vs,
1241 struct vhost_scsi_target *t)
1242{
1243 struct tcm_vhost_tport *tv_tport;
1244 struct tcm_vhost_tpg *tv_tpg;
Asias He4f7f46d2013-04-03 14:17:37 +08001245 struct vhost_virtqueue *vq;
1246 bool match = false;
Asias He67e18cf2013-02-05 12:31:57 +08001247 int index, ret, i;
1248 u8 target;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001249
Asias Hef2b7daf2013-04-25 15:35:20 +08001250 mutex_lock(&tcm_vhost_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001251 mutex_lock(&vs->dev.mutex);
1252 /* Verify that ring has been setup correctly. */
1253 for (index = 0; index < vs->dev.nvqs; ++index) {
Asias He3ab2e422013-04-27 11:16:48 +08001254 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001255 ret = -EFAULT;
Asias He038e0af2013-03-15 09:14:05 +08001256 goto err_dev;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001257 }
1258 }
Asias He4f7f46d2013-04-03 14:17:37 +08001259
1260 if (!vs->vs_tpg) {
Asias Hef2b7daf2013-04-25 15:35:20 +08001261 ret = 0;
1262 goto err_dev;
Asias He4f7f46d2013-04-03 14:17:37 +08001263 }
1264
Asias He67e18cf2013-02-05 12:31:57 +08001265 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1266 target = i;
Asias He67e18cf2013-02-05 12:31:57 +08001267 tv_tpg = vs->vs_tpg[target];
1268 if (!tv_tpg)
1269 continue;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001270
Asias He038e0af2013-03-15 09:14:05 +08001271 mutex_lock(&tv_tpg->tv_tpg_mutex);
Asias He67e18cf2013-02-05 12:31:57 +08001272 tv_tport = tv_tpg->tport;
1273 if (!tv_tport) {
1274 ret = -ENODEV;
Asias He038e0af2013-03-15 09:14:05 +08001275 goto err_tpg;
Asias He67e18cf2013-02-05 12:31:57 +08001276 }
1277
1278 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1279 pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu"
1280 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
1281 tv_tport->tport_name, tv_tpg->tport_tpgt,
1282 t->vhost_wwpn, t->vhost_tpgt);
1283 ret = -EINVAL;
Asias He038e0af2013-03-15 09:14:05 +08001284 goto err_tpg;
Asias He67e18cf2013-02-05 12:31:57 +08001285 }
1286 tv_tpg->tv_tpg_vhost_count--;
Asias Hea6c9af82013-04-25 15:35:21 +08001287 tv_tpg->vhost_scsi = NULL;
Asias He67e18cf2013-02-05 12:31:57 +08001288 vs->vs_tpg[target] = NULL;
Asias He4f7f46d2013-04-03 14:17:37 +08001289 match = true;
Asias He038e0af2013-03-15 09:14:05 +08001290 mutex_unlock(&tv_tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001291 }
Asias He4f7f46d2013-04-03 14:17:37 +08001292 if (match) {
1293 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
Asias He3ab2e422013-04-27 11:16:48 +08001294 vq = &vs->vqs[i].vq;
Asias He4f7f46d2013-04-03 14:17:37 +08001295 /* Flushing the vhost_work acts as synchronize_rcu */
1296 mutex_lock(&vq->mutex);
1297 rcu_assign_pointer(vq->private_data, NULL);
1298 mutex_unlock(&vq->mutex);
1299 }
1300 }
1301 /*
1302 * Act as synchronize_rcu to make sure access to
1303 * old vs->vs_tpg is finished.
1304 */
1305 vhost_scsi_flush(vs);
1306 kfree(vs->vs_tpg);
1307 vs->vs_tpg = NULL;
Asias Hea6c9af82013-04-25 15:35:21 +08001308 WARN_ON(vs->vs_events_nr);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001309 mutex_unlock(&vs->dev.mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001310 mutex_unlock(&tcm_vhost_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001311 return 0;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001312
Asias He038e0af2013-03-15 09:14:05 +08001313err_tpg:
1314 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1315err_dev:
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001316 mutex_unlock(&vs->dev.mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001317 mutex_unlock(&tcm_vhost_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001318 return ret;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001319}
1320
Asias He4f7f46d2013-04-03 14:17:37 +08001321static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1322{
1323 if (features & ~VHOST_SCSI_FEATURES)
1324 return -EOPNOTSUPP;
1325
1326 mutex_lock(&vs->dev.mutex);
1327 if ((features & (1 << VHOST_F_LOG_ALL)) &&
1328 !vhost_log_access_ok(&vs->dev)) {
1329 mutex_unlock(&vs->dev.mutex);
1330 return -EFAULT;
1331 }
1332 vs->dev.acked_features = features;
1333 smp_wmb();
1334 vhost_scsi_flush(vs);
1335 mutex_unlock(&vs->dev.mutex);
1336 return 0;
1337}
1338
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001339static int vhost_scsi_open(struct inode *inode, struct file *f)
1340{
1341 struct vhost_scsi *s;
Asias He3ab2e422013-04-27 11:16:48 +08001342 struct vhost_virtqueue **vqs;
Asias He1b7f3902013-02-06 13:20:59 +08001343 int r, i;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001344
1345 s = kzalloc(sizeof(*s), GFP_KERNEL);
1346 if (!s)
1347 return -ENOMEM;
1348
Asias He3ab2e422013-04-27 11:16:48 +08001349 vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL);
1350 if (!vqs) {
1351 kfree(s);
1352 return -ENOMEM;
1353 }
1354
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001355 vhost_work_init(&s->vs_completion_work, vhost_scsi_complete_cmd_work);
Asias Hea6c9af82013-04-25 15:35:21 +08001356 vhost_work_init(&s->vs_event_work, tcm_vhost_evt_work);
1357
1358 s->vs_events_nr = 0;
1359 s->vs_events_missed = false;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001360
Asias He3ab2e422013-04-27 11:16:48 +08001361 vqs[VHOST_SCSI_VQ_CTL] = &s->vqs[VHOST_SCSI_VQ_CTL].vq;
1362 vqs[VHOST_SCSI_VQ_EVT] = &s->vqs[VHOST_SCSI_VQ_EVT].vq;
1363 s->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1364 s->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
1365 for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
1366 vqs[i] = &s->vqs[i].vq;
1367 s->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
1368 }
1369 r = vhost_dev_init(&s->dev, vqs, VHOST_SCSI_MAX_VQ);
Asias Hef2f0173d2013-04-27 11:16:49 +08001370
1371 tcm_vhost_init_inflight(s, NULL);
1372
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001373 if (r < 0) {
Asias He3ab2e422013-04-27 11:16:48 +08001374 kfree(vqs);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001375 kfree(s);
1376 return r;
1377 }
1378
1379 f->private_data = s;
1380 return 0;
1381}
1382
1383static int vhost_scsi_release(struct inode *inode, struct file *f)
1384{
1385 struct vhost_scsi *s = f->private_data;
Asias He67e18cf2013-02-05 12:31:57 +08001386 struct vhost_scsi_target t;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001387
Asias He67e18cf2013-02-05 12:31:57 +08001388 mutex_lock(&s->dev.mutex);
1389 memcpy(t.vhost_wwpn, s->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
1390 mutex_unlock(&s->dev.mutex);
1391 vhost_scsi_clear_endpoint(s, &t);
Michael S. Tsirkinb2116162012-11-01 09:16:46 +00001392 vhost_dev_stop(&s->dev);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001393 vhost_dev_cleanup(&s->dev, false);
Asias Hea6c9af82013-04-25 15:35:21 +08001394 /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
1395 vhost_scsi_flush(s);
Asias He3ab2e422013-04-27 11:16:48 +08001396 kfree(s->dev.vqs);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001397 kfree(s);
1398 return 0;
1399}
1400
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001401static long vhost_scsi_ioctl(struct file *f, unsigned int ioctl,
1402 unsigned long arg)
1403{
1404 struct vhost_scsi *vs = f->private_data;
1405 struct vhost_scsi_target backend;
1406 void __user *argp = (void __user *)arg;
1407 u64 __user *featurep = argp;
Asias He11c634182013-04-25 15:35:22 +08001408 u32 __user *eventsp = argp;
1409 u32 events_missed;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001410 u64 features;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001411 int r, abi_version = VHOST_SCSI_ABI_VERSION;
Asias He3ab2e422013-04-27 11:16:48 +08001412 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001413
1414 switch (ioctl) {
1415 case VHOST_SCSI_SET_ENDPOINT:
1416 if (copy_from_user(&backend, argp, sizeof backend))
1417 return -EFAULT;
Michael S. Tsirkin6de71452012-08-18 15:44:09 -07001418 if (backend.reserved != 0)
1419 return -EOPNOTSUPP;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001420
1421 return vhost_scsi_set_endpoint(vs, &backend);
1422 case VHOST_SCSI_CLEAR_ENDPOINT:
1423 if (copy_from_user(&backend, argp, sizeof backend))
1424 return -EFAULT;
Michael S. Tsirkin6de71452012-08-18 15:44:09 -07001425 if (backend.reserved != 0)
1426 return -EOPNOTSUPP;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001427
1428 return vhost_scsi_clear_endpoint(vs, &backend);
1429 case VHOST_SCSI_GET_ABI_VERSION:
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001430 if (copy_to_user(argp, &abi_version, sizeof abi_version))
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001431 return -EFAULT;
1432 return 0;
Asias He11c634182013-04-25 15:35:22 +08001433 case VHOST_SCSI_SET_EVENTS_MISSED:
1434 if (get_user(events_missed, eventsp))
1435 return -EFAULT;
1436 mutex_lock(&vq->mutex);
1437 vs->vs_events_missed = events_missed;
1438 mutex_unlock(&vq->mutex);
1439 return 0;
1440 case VHOST_SCSI_GET_EVENTS_MISSED:
1441 mutex_lock(&vq->mutex);
1442 events_missed = vs->vs_events_missed;
1443 mutex_unlock(&vq->mutex);
1444 if (put_user(events_missed, eventsp))
1445 return -EFAULT;
1446 return 0;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001447 case VHOST_GET_FEATURES:
Nicholas Bellinger5dade712013-03-27 17:23:41 -07001448 features = VHOST_SCSI_FEATURES;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001449 if (copy_to_user(featurep, &features, sizeof features))
1450 return -EFAULT;
1451 return 0;
1452 case VHOST_SET_FEATURES:
1453 if (copy_from_user(&features, featurep, sizeof features))
1454 return -EFAULT;
1455 return vhost_scsi_set_features(vs, features);
1456 default:
1457 mutex_lock(&vs->dev.mutex);
Michael S. Tsirkin935cdee2012-12-06 14:03:34 +02001458 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
1459 /* TODO: flush backend after dev ioctl. */
1460 if (r == -ENOIOCTLCMD)
1461 r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001462 mutex_unlock(&vs->dev.mutex);
1463 return r;
1464 }
1465}
1466
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001467#ifdef CONFIG_COMPAT
1468static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
1469 unsigned long arg)
1470{
1471 return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
1472}
1473#endif
1474
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001475static const struct file_operations vhost_scsi_fops = {
1476 .owner = THIS_MODULE,
1477 .release = vhost_scsi_release,
1478 .unlocked_ioctl = vhost_scsi_ioctl,
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001479#ifdef CONFIG_COMPAT
1480 .compat_ioctl = vhost_scsi_compat_ioctl,
1481#endif
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001482 .open = vhost_scsi_open,
1483 .llseek = noop_llseek,
1484};
1485
1486static struct miscdevice vhost_scsi_misc = {
1487 MISC_DYNAMIC_MINOR,
1488 "vhost-scsi",
1489 &vhost_scsi_fops,
1490};
1491
1492static int __init vhost_scsi_register(void)
1493{
1494 return misc_register(&vhost_scsi_misc);
1495}
1496
1497static int vhost_scsi_deregister(void)
1498{
1499 return misc_deregister(&vhost_scsi_misc);
1500}
1501
1502static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport)
1503{
1504 switch (tport->tport_proto_id) {
1505 case SCSI_PROTOCOL_SAS:
1506 return "SAS";
1507 case SCSI_PROTOCOL_FCP:
1508 return "FCP";
1509 case SCSI_PROTOCOL_ISCSI:
1510 return "iSCSI";
1511 default:
1512 break;
1513 }
1514
1515 return "Unknown";
1516}
1517
Asias Hea6c9af82013-04-25 15:35:21 +08001518static void tcm_vhost_do_plug(struct tcm_vhost_tpg *tpg,
1519 struct se_lun *lun, bool plug)
1520{
1521
1522 struct vhost_scsi *vs = tpg->vhost_scsi;
1523 struct vhost_virtqueue *vq;
1524 u32 reason;
1525
1526 if (!vs)
1527 return;
1528
1529 mutex_lock(&vs->dev.mutex);
1530 if (!vhost_has_feature(&vs->dev, VIRTIO_SCSI_F_HOTPLUG)) {
1531 mutex_unlock(&vs->dev.mutex);
1532 return;
1533 }
1534
1535 if (plug)
1536 reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
1537 else
1538 reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
1539
Asias He3ab2e422013-04-27 11:16:48 +08001540 vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +08001541 mutex_lock(&vq->mutex);
1542 tcm_vhost_send_evt(vs, tpg, lun,
1543 VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
1544 mutex_unlock(&vq->mutex);
1545 mutex_unlock(&vs->dev.mutex);
1546}
1547
1548static void tcm_vhost_hotplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
1549{
1550 tcm_vhost_do_plug(tpg, lun, true);
1551}
1552
1553static void tcm_vhost_hotunplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
1554{
1555 tcm_vhost_do_plug(tpg, lun, false);
1556}
1557
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001558static int tcm_vhost_port_link(struct se_portal_group *se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001559 struct se_lun *lun)
1560{
1561 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1562 struct tcm_vhost_tpg, se_tpg);
1563
Asias Hea6c9af82013-04-25 15:35:21 +08001564 mutex_lock(&tcm_vhost_mutex);
1565
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001566 mutex_lock(&tv_tpg->tv_tpg_mutex);
1567 tv_tpg->tv_tpg_port_count++;
1568 mutex_unlock(&tv_tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001569
Asias Hea6c9af82013-04-25 15:35:21 +08001570 tcm_vhost_hotplug(tv_tpg, lun);
1571
1572 mutex_unlock(&tcm_vhost_mutex);
1573
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001574 return 0;
1575}
1576
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001577static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg,
Asias Hea6c9af82013-04-25 15:35:21 +08001578 struct se_lun *lun)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001579{
1580 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1581 struct tcm_vhost_tpg, se_tpg);
1582
Asias Hea6c9af82013-04-25 15:35:21 +08001583 mutex_lock(&tcm_vhost_mutex);
1584
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001585 mutex_lock(&tv_tpg->tv_tpg_mutex);
1586 tv_tpg->tv_tpg_port_count--;
1587 mutex_unlock(&tv_tpg->tv_tpg_mutex);
Asias Hea6c9af82013-04-25 15:35:21 +08001588
1589 tcm_vhost_hotunplug(tv_tpg, lun);
1590
1591 mutex_unlock(&tcm_vhost_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001592}
1593
1594static struct se_node_acl *tcm_vhost_make_nodeacl(
1595 struct se_portal_group *se_tpg,
1596 struct config_group *group,
1597 const char *name)
1598{
1599 struct se_node_acl *se_nacl, *se_nacl_new;
1600 struct tcm_vhost_nacl *nacl;
1601 u64 wwpn = 0;
1602 u32 nexus_depth;
1603
1604 /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1605 return ERR_PTR(-EINVAL); */
1606 se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg);
1607 if (!se_nacl_new)
1608 return ERR_PTR(-ENOMEM);
1609
1610 nexus_depth = 1;
1611 /*
1612 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1613 * when converting a NodeACL from demo mode -> explict
1614 */
1615 se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1616 name, nexus_depth);
1617 if (IS_ERR(se_nacl)) {
1618 tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new);
1619 return se_nacl;
1620 }
1621 /*
1622 * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN
1623 */
1624 nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl);
1625 nacl->iport_wwpn = wwpn;
1626
1627 return se_nacl;
1628}
1629
1630static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl)
1631{
1632 struct tcm_vhost_nacl *nacl = container_of(se_acl,
1633 struct tcm_vhost_nacl, se_node_acl);
1634 core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1635 kfree(nacl);
1636}
1637
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001638static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tv_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001639 const char *name)
1640{
1641 struct se_portal_group *se_tpg;
1642 struct tcm_vhost_nexus *tv_nexus;
1643
1644 mutex_lock(&tv_tpg->tv_tpg_mutex);
1645 if (tv_tpg->tpg_nexus) {
1646 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1647 pr_debug("tv_tpg->tpg_nexus already exists\n");
1648 return -EEXIST;
1649 }
1650 se_tpg = &tv_tpg->se_tpg;
1651
1652 tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL);
1653 if (!tv_nexus) {
1654 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1655 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1656 return -ENOMEM;
1657 }
1658 /*
1659 * Initialize the struct se_session pointer
1660 */
1661 tv_nexus->tvn_se_sess = transport_init_session();
1662 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1663 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1664 kfree(tv_nexus);
1665 return -ENOMEM;
1666 }
1667 /*
1668 * Since we are running in 'demo mode' this call with generate a
1669 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1670 * the SCSI Initiator port name of the passed configfs group 'name'.
1671 */
1672 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1673 se_tpg, (unsigned char *)name);
1674 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1675 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1676 pr_debug("core_tpg_check_initiator_node_acl() failed"
1677 " for %s\n", name);
1678 transport_free_session(tv_nexus->tvn_se_sess);
1679 kfree(tv_nexus);
1680 return -ENOMEM;
1681 }
1682 /*
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001683 * Now register the TCM vhost virtual I_T Nexus as active with the
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001684 * call to __transport_register_session()
1685 */
1686 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1687 tv_nexus->tvn_se_sess, tv_nexus);
1688 tv_tpg->tpg_nexus = tv_nexus;
1689
1690 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1691 return 0;
1692}
1693
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001694static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg *tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001695{
1696 struct se_session *se_sess;
1697 struct tcm_vhost_nexus *tv_nexus;
1698
1699 mutex_lock(&tpg->tv_tpg_mutex);
1700 tv_nexus = tpg->tpg_nexus;
1701 if (!tv_nexus) {
1702 mutex_unlock(&tpg->tv_tpg_mutex);
1703 return -ENODEV;
1704 }
1705
1706 se_sess = tv_nexus->tvn_se_sess;
1707 if (!se_sess) {
1708 mutex_unlock(&tpg->tv_tpg_mutex);
1709 return -ENODEV;
1710 }
1711
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001712 if (tpg->tv_tpg_port_count != 0) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001713 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001714 pr_err("Unable to remove TCM_vhost I_T Nexus with"
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001715 " active TPG port count: %d\n",
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001716 tpg->tv_tpg_port_count);
1717 return -EBUSY;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001718 }
1719
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001720 if (tpg->tv_tpg_vhost_count != 0) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001721 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001722 pr_err("Unable to remove TCM_vhost I_T Nexus with"
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001723 " active TPG vhost count: %d\n",
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001724 tpg->tv_tpg_vhost_count);
1725 return -EBUSY;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001726 }
1727
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001728 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001729 " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport),
1730 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1731 /*
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001732 * Release the SCSI I_T Nexus to the emulated vhost Target Port
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001733 */
1734 transport_deregister_session(tv_nexus->tvn_se_sess);
1735 tpg->tpg_nexus = NULL;
1736 mutex_unlock(&tpg->tv_tpg_mutex);
1737
1738 kfree(tv_nexus);
1739 return 0;
1740}
1741
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001742static ssize_t tcm_vhost_tpg_show_nexus(struct se_portal_group *se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001743 char *page)
1744{
1745 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1746 struct tcm_vhost_tpg, se_tpg);
1747 struct tcm_vhost_nexus *tv_nexus;
1748 ssize_t ret;
1749
1750 mutex_lock(&tv_tpg->tv_tpg_mutex);
1751 tv_nexus = tv_tpg->tpg_nexus;
1752 if (!tv_nexus) {
1753 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1754 return -ENODEV;
1755 }
1756 ret = snprintf(page, PAGE_SIZE, "%s\n",
1757 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1758 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1759
1760 return ret;
1761}
1762
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001763static ssize_t tcm_vhost_tpg_store_nexus(struct se_portal_group *se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001764 const char *page,
1765 size_t count)
1766{
1767 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1768 struct tcm_vhost_tpg, se_tpg);
1769 struct tcm_vhost_tport *tport_wwn = tv_tpg->tport;
1770 unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr;
1771 int ret;
1772 /*
1773 * Shutdown the active I_T nexus if 'NULL' is passed..
1774 */
1775 if (!strncmp(page, "NULL", 4)) {
1776 ret = tcm_vhost_drop_nexus(tv_tpg);
1777 return (!ret) ? count : ret;
1778 }
1779 /*
1780 * Otherwise make sure the passed virtual Initiator port WWN matches
1781 * the fabric protocol_id set in tcm_vhost_make_tport(), and call
1782 * tcm_vhost_make_nexus().
1783 */
1784 if (strlen(page) >= TCM_VHOST_NAMELEN) {
1785 pr_err("Emulated NAA Sas Address: %s, exceeds"
1786 " max: %d\n", page, TCM_VHOST_NAMELEN);
1787 return -EINVAL;
1788 }
1789 snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page);
1790
1791 ptr = strstr(i_port, "naa.");
1792 if (ptr) {
1793 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1794 pr_err("Passed SAS Initiator Port %s does not"
1795 " match target port protoid: %s\n", i_port,
1796 tcm_vhost_dump_proto_id(tport_wwn));
1797 return -EINVAL;
1798 }
1799 port_ptr = &i_port[0];
1800 goto check_newline;
1801 }
1802 ptr = strstr(i_port, "fc.");
1803 if (ptr) {
1804 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1805 pr_err("Passed FCP Initiator Port %s does not"
1806 " match target port protoid: %s\n", i_port,
1807 tcm_vhost_dump_proto_id(tport_wwn));
1808 return -EINVAL;
1809 }
1810 port_ptr = &i_port[3]; /* Skip over "fc." */
1811 goto check_newline;
1812 }
1813 ptr = strstr(i_port, "iqn.");
1814 if (ptr) {
1815 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1816 pr_err("Passed iSCSI Initiator Port %s does not"
1817 " match target port protoid: %s\n", i_port,
1818 tcm_vhost_dump_proto_id(tport_wwn));
1819 return -EINVAL;
1820 }
1821 port_ptr = &i_port[0];
1822 goto check_newline;
1823 }
1824 pr_err("Unable to locate prefix for emulated Initiator Port:"
1825 " %s\n", i_port);
1826 return -EINVAL;
1827 /*
1828 * Clear any trailing newline for the NAA WWN
1829 */
1830check_newline:
1831 if (i_port[strlen(i_port)-1] == '\n')
1832 i_port[strlen(i_port)-1] = '\0';
1833
1834 ret = tcm_vhost_make_nexus(tv_tpg, port_ptr);
1835 if (ret < 0)
1836 return ret;
1837
1838 return count;
1839}
1840
1841TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR);
1842
1843static struct configfs_attribute *tcm_vhost_tpg_attrs[] = {
1844 &tcm_vhost_tpg_nexus.attr,
1845 NULL,
1846};
1847
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001848static struct se_portal_group *tcm_vhost_make_tpg(struct se_wwn *wwn,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001849 struct config_group *group,
1850 const char *name)
1851{
1852 struct tcm_vhost_tport *tport = container_of(wwn,
1853 struct tcm_vhost_tport, tport_wwn);
1854
1855 struct tcm_vhost_tpg *tpg;
1856 unsigned long tpgt;
1857 int ret;
1858
1859 if (strstr(name, "tpgt_") != name)
1860 return ERR_PTR(-EINVAL);
1861 if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
1862 return ERR_PTR(-EINVAL);
1863
1864 tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL);
1865 if (!tpg) {
1866 pr_err("Unable to allocate struct tcm_vhost_tpg");
1867 return ERR_PTR(-ENOMEM);
1868 }
1869 mutex_init(&tpg->tv_tpg_mutex);
1870 INIT_LIST_HEAD(&tpg->tv_tpg_list);
1871 tpg->tport = tport;
1872 tpg->tport_tpgt = tpgt;
1873
1874 ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn,
1875 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
1876 if (ret < 0) {
1877 kfree(tpg);
1878 return NULL;
1879 }
1880 mutex_lock(&tcm_vhost_mutex);
1881 list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list);
1882 mutex_unlock(&tcm_vhost_mutex);
1883
1884 return &tpg->se_tpg;
1885}
1886
1887static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg)
1888{
1889 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
1890 struct tcm_vhost_tpg, se_tpg);
1891
1892 mutex_lock(&tcm_vhost_mutex);
1893 list_del(&tpg->tv_tpg_list);
1894 mutex_unlock(&tcm_vhost_mutex);
1895 /*
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001896 * Release the virtual I_T Nexus for this vhost TPG
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001897 */
1898 tcm_vhost_drop_nexus(tpg);
1899 /*
1900 * Deregister the se_tpg from TCM..
1901 */
1902 core_tpg_deregister(se_tpg);
1903 kfree(tpg);
1904}
1905
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001906static struct se_wwn *tcm_vhost_make_tport(struct target_fabric_configfs *tf,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001907 struct config_group *group,
1908 const char *name)
1909{
1910 struct tcm_vhost_tport *tport;
1911 char *ptr;
1912 u64 wwpn = 0;
1913 int off = 0;
1914
1915 /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1916 return ERR_PTR(-EINVAL); */
1917
1918 tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL);
1919 if (!tport) {
1920 pr_err("Unable to allocate struct tcm_vhost_tport");
1921 return ERR_PTR(-ENOMEM);
1922 }
1923 tport->tport_wwpn = wwpn;
1924 /*
1925 * Determine the emulated Protocol Identifier and Target Port Name
1926 * based on the incoming configfs directory name.
1927 */
1928 ptr = strstr(name, "naa.");
1929 if (ptr) {
1930 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
1931 goto check_len;
1932 }
1933 ptr = strstr(name, "fc.");
1934 if (ptr) {
1935 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
1936 off = 3; /* Skip over "fc." */
1937 goto check_len;
1938 }
1939 ptr = strstr(name, "iqn.");
1940 if (ptr) {
1941 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
1942 goto check_len;
1943 }
1944
1945 pr_err("Unable to locate prefix for emulated Target Port:"
1946 " %s\n", name);
1947 kfree(tport);
1948 return ERR_PTR(-EINVAL);
1949
1950check_len:
1951 if (strlen(name) >= TCM_VHOST_NAMELEN) {
1952 pr_err("Emulated %s Address: %s, exceeds"
1953 " max: %d\n", name, tcm_vhost_dump_proto_id(tport),
1954 TCM_VHOST_NAMELEN);
1955 kfree(tport);
1956 return ERR_PTR(-EINVAL);
1957 }
1958 snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]);
1959
1960 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
1961 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name);
1962
1963 return &tport->tport_wwn;
1964}
1965
1966static void tcm_vhost_drop_tport(struct se_wwn *wwn)
1967{
1968 struct tcm_vhost_tport *tport = container_of(wwn,
1969 struct tcm_vhost_tport, tport_wwn);
1970
1971 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
1972 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport),
1973 tport->tport_name);
1974
1975 kfree(tport);
1976}
1977
1978static ssize_t tcm_vhost_wwn_show_attr_version(
1979 struct target_fabric_configfs *tf,
1980 char *page)
1981{
1982 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
1983 "on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
1984 utsname()->machine);
1985}
1986
1987TF_WWN_ATTR_RO(tcm_vhost, version);
1988
1989static struct configfs_attribute *tcm_vhost_wwn_attrs[] = {
1990 &tcm_vhost_wwn_version.attr,
1991 NULL,
1992};
1993
1994static struct target_core_fabric_ops tcm_vhost_ops = {
1995 .get_fabric_name = tcm_vhost_get_fabric_name,
1996 .get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident,
1997 .tpg_get_wwn = tcm_vhost_get_fabric_wwn,
1998 .tpg_get_tag = tcm_vhost_get_tag,
1999 .tpg_get_default_depth = tcm_vhost_get_default_depth,
2000 .tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id,
2001 .tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len,
2002 .tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id,
2003 .tpg_check_demo_mode = tcm_vhost_check_true,
2004 .tpg_check_demo_mode_cache = tcm_vhost_check_true,
2005 .tpg_check_demo_mode_write_protect = tcm_vhost_check_false,
2006 .tpg_check_prod_mode_write_protect = tcm_vhost_check_false,
2007 .tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl,
2008 .tpg_release_fabric_acl = tcm_vhost_release_fabric_acl,
2009 .tpg_get_inst_index = tcm_vhost_tpg_get_inst_index,
2010 .release_cmd = tcm_vhost_release_cmd,
2011 .shutdown_session = tcm_vhost_shutdown_session,
2012 .close_session = tcm_vhost_close_session,
2013 .sess_get_index = tcm_vhost_sess_get_index,
2014 .sess_get_initiator_sid = NULL,
2015 .write_pending = tcm_vhost_write_pending,
2016 .write_pending_status = tcm_vhost_write_pending_status,
2017 .set_default_node_attributes = tcm_vhost_set_default_node_attrs,
2018 .get_task_tag = tcm_vhost_get_task_tag,
2019 .get_cmd_state = tcm_vhost_get_cmd_state,
2020 .queue_data_in = tcm_vhost_queue_data_in,
2021 .queue_status = tcm_vhost_queue_status,
2022 .queue_tm_rsp = tcm_vhost_queue_tm_rsp,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002023 /*
2024 * Setup callers for generic logic in target_core_fabric_configfs.c
2025 */
2026 .fabric_make_wwn = tcm_vhost_make_tport,
2027 .fabric_drop_wwn = tcm_vhost_drop_tport,
2028 .fabric_make_tpg = tcm_vhost_make_tpg,
2029 .fabric_drop_tpg = tcm_vhost_drop_tpg,
2030 .fabric_post_link = tcm_vhost_port_link,
2031 .fabric_pre_unlink = tcm_vhost_port_unlink,
2032 .fabric_make_np = NULL,
2033 .fabric_drop_np = NULL,
2034 .fabric_make_nodeacl = tcm_vhost_make_nodeacl,
2035 .fabric_drop_nodeacl = tcm_vhost_drop_nodeacl,
2036};
2037
2038static int tcm_vhost_register_configfs(void)
2039{
2040 struct target_fabric_configfs *fabric;
2041 int ret;
2042
2043 pr_debug("TCM_VHOST fabric module %s on %s/%s"
2044 " on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
2045 utsname()->machine);
2046 /*
2047 * Register the top level struct config_item_type with TCM core
2048 */
2049 fabric = target_fabric_configfs_init(THIS_MODULE, "vhost");
2050 if (IS_ERR(fabric)) {
2051 pr_err("target_fabric_configfs_init() failed\n");
2052 return PTR_ERR(fabric);
2053 }
2054 /*
2055 * Setup fabric->tf_ops from our local tcm_vhost_ops
2056 */
2057 fabric->tf_ops = tcm_vhost_ops;
2058 /*
2059 * Setup default attribute lists for various fabric->tf_cit_tmpl
2060 */
2061 TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs;
2062 TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs;
2063 TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
2064 TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
2065 TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
2066 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
2067 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
2068 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
2069 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
2070 /*
2071 * Register the fabric for use within TCM
2072 */
2073 ret = target_fabric_configfs_register(fabric);
2074 if (ret < 0) {
2075 pr_err("target_fabric_configfs_register() failed"
2076 " for TCM_VHOST\n");
2077 return ret;
2078 }
2079 /*
2080 * Setup our local pointer to *fabric
2081 */
2082 tcm_vhost_fabric_configfs = fabric;
2083 pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n");
2084 return 0;
2085};
2086
2087static void tcm_vhost_deregister_configfs(void)
2088{
2089 if (!tcm_vhost_fabric_configfs)
2090 return;
2091
2092 target_fabric_configfs_deregister(tcm_vhost_fabric_configfs);
2093 tcm_vhost_fabric_configfs = NULL;
2094 pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n");
2095};
2096
2097static int __init tcm_vhost_init(void)
2098{
2099 int ret = -ENOMEM;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002100 /*
2101 * Use our own dedicated workqueue for submitting I/O into
2102 * target core to avoid contention within system_wq.
2103 */
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002104 tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0);
2105 if (!tcm_vhost_workqueue)
2106 goto out;
2107
2108 ret = vhost_scsi_register();
2109 if (ret < 0)
2110 goto out_destroy_workqueue;
2111
2112 ret = tcm_vhost_register_configfs();
2113 if (ret < 0)
2114 goto out_vhost_scsi_deregister;
2115
2116 return 0;
2117
2118out_vhost_scsi_deregister:
2119 vhost_scsi_deregister();
2120out_destroy_workqueue:
2121 destroy_workqueue(tcm_vhost_workqueue);
2122out:
2123 return ret;
2124};
2125
2126static void tcm_vhost_exit(void)
2127{
2128 tcm_vhost_deregister_configfs();
2129 vhost_scsi_deregister();
2130 destroy_workqueue(tcm_vhost_workqueue);
2131};
2132
Michael S. Tsirkin181c04a2013-05-02 03:52:59 +03002133MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2134MODULE_ALIAS("tcm_vhost");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002135MODULE_LICENSE("GPL");
2136module_init(tcm_vhost_init);
2137module_exit(tcm_vhost_exit);