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Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001/*******************************************************************************
2 * Vhost kernel TCM fabric driver for virtio SCSI initiators
3 *
Nicholas Bellinger4c762512013-09-05 15:29:12 -07004 * (C) Copyright 2010-2013 Datera, Inc.
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07005 * (C) Copyright 2010-2012 IBM Corp.
6 *
7 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
8 *
Nicholas Bellinger4c762512013-09-05 15:29:12 -07009 * Authors: Nicholas A. Bellinger <nab@daterainc.com>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070010 * 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 Bellinger4824d3b2013-06-07 17:47:46 -070051#include <linux/percpu_ida.h>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070052
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070053#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
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -070058#define TCM_VHOST_DEFAULT_TAGS 256
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -070059#define TCM_VHOST_PREALLOC_SGLS 2048
Nicholas Bellinger5a01d082014-02-22 18:34:08 -080060#define TCM_VHOST_PREALLOC_UPAGES 2048
Nicholas Bellingerb1935f62014-02-22 18:08:24 -080061#define TCM_VHOST_PREALLOC_PROT_SGLS 512
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030062
63struct vhost_scsi_inflight {
64 /* Wait for the flush operation to finish */
65 struct completion comp;
66 /* Refcount for the inflight reqs */
67 struct kref kref;
68};
69
70struct tcm_vhost_cmd {
71 /* Descriptor from vhost_get_vq_desc() for virt_queue segment */
72 int tvc_vq_desc;
73 /* virtio-scsi initiator task attribute */
74 int tvc_task_attr;
75 /* virtio-scsi initiator data direction */
76 enum dma_data_direction tvc_data_direction;
77 /* Expected data transfer length from virtio-scsi header */
78 u32 tvc_exp_data_len;
79 /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
80 u64 tvc_tag;
81 /* The number of scatterlists associated with this cmd */
82 u32 tvc_sgl_count;
Nicholas Bellingere31885d2014-02-22 18:34:43 -080083 u32 tvc_prot_sgl_count;
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030084 /* Saved unpacked SCSI LUN for tcm_vhost_submission_work() */
85 u32 tvc_lun;
86 /* Pointer to the SGL formatted memory from virtio-scsi */
87 struct scatterlist *tvc_sgl;
Nicholas Bellingerb1935f62014-02-22 18:08:24 -080088 struct scatterlist *tvc_prot_sgl;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -070089 struct page **tvc_upages;
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030090 /* Pointer to response */
91 struct virtio_scsi_cmd_resp __user *tvc_resp;
92 /* Pointer to vhost_scsi for our device */
93 struct vhost_scsi *tvc_vhost;
94 /* Pointer to vhost_virtqueue for the cmd */
95 struct vhost_virtqueue *tvc_vq;
96 /* Pointer to vhost nexus memory */
97 struct tcm_vhost_nexus *tvc_nexus;
98 /* The TCM I/O descriptor that is accessed via container_of() */
99 struct se_cmd tvc_se_cmd;
100 /* work item used for cmwq dispatch to tcm_vhost_submission_work() */
101 struct work_struct work;
102 /* Copy of the incoming SCSI command descriptor block (CDB) */
103 unsigned char tvc_cdb[TCM_VHOST_MAX_CDB_SIZE];
104 /* Sense buffer that will be mapped into outgoing status */
105 unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
106 /* Completed commands list, serviced from vhost worker thread */
107 struct llist_node tvc_completion_list;
108 /* Used to track inflight cmd */
109 struct vhost_scsi_inflight *inflight;
110};
111
112struct tcm_vhost_nexus {
113 /* Pointer to TCM session for I_T Nexus */
114 struct se_session *tvn_se_sess;
115};
116
117struct tcm_vhost_nacl {
118 /* Binary World Wide unique Port Name for Vhost Initiator port */
119 u64 iport_wwpn;
120 /* ASCII formatted WWPN for Sas Initiator port */
121 char iport_name[TCM_VHOST_NAMELEN];
122 /* Returned by tcm_vhost_make_nodeacl() */
123 struct se_node_acl se_node_acl;
124};
125
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300126struct tcm_vhost_tpg {
127 /* Vhost port target portal group tag for TCM */
128 u16 tport_tpgt;
129 /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
130 int tv_tpg_port_count;
131 /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
132 int tv_tpg_vhost_count;
133 /* list for tcm_vhost_list */
134 struct list_head tv_tpg_list;
135 /* Used to protect access for tpg_nexus */
136 struct mutex tv_tpg_mutex;
137 /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
138 struct tcm_vhost_nexus *tpg_nexus;
139 /* Pointer back to tcm_vhost_tport */
140 struct tcm_vhost_tport *tport;
141 /* Returned by tcm_vhost_make_tpg() */
142 struct se_portal_group se_tpg;
143 /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */
144 struct vhost_scsi *vhost_scsi;
145};
146
147struct tcm_vhost_tport {
148 /* SCSI protocol the tport is providing */
149 u8 tport_proto_id;
150 /* Binary World Wide unique Port Name for Vhost Target port */
151 u64 tport_wwpn;
152 /* ASCII formatted WWPN for Vhost Target port */
153 char tport_name[TCM_VHOST_NAMELEN];
154 /* Returned by tcm_vhost_make_tport() */
155 struct se_wwn tport_wwn;
156};
157
158struct tcm_vhost_evt {
159 /* event to be sent to guest */
160 struct virtio_scsi_event event;
161 /* event list, serviced from vhost worker thread */
162 struct llist_node list;
163};
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700164
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700165enum {
166 VHOST_SCSI_VQ_CTL = 0,
167 VHOST_SCSI_VQ_EVT = 1,
168 VHOST_SCSI_VQ_IO = 2,
169};
170
Nicholas Bellinger5dade712013-03-27 17:23:41 -0700171enum {
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800172 VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
173 (1ULL << VIRTIO_SCSI_F_T10_PI)
Nicholas Bellinger5dade712013-03-27 17:23:41 -0700174};
175
Asias He1b7f3902013-02-06 13:20:59 +0800176#define VHOST_SCSI_MAX_TARGET 256
177#define VHOST_SCSI_MAX_VQ 128
Asias Hea6c9af82013-04-25 15:35:21 +0800178#define VHOST_SCSI_MAX_EVENT 128
Asias He67e18cf2013-02-05 12:31:57 +0800179
Asias He3ab2e422013-04-27 11:16:48 +0800180struct vhost_scsi_virtqueue {
181 struct vhost_virtqueue vq;
Michael S. Tsirkin3dfbff32013-04-28 15:38:52 +0300182 /*
183 * Reference counting for inflight reqs, used for flush operation. At
184 * each time, one reference tracks new commands submitted, while we
185 * wait for another one to reach 0.
186 */
Asias Hef2f0173d2013-04-27 11:16:49 +0800187 struct vhost_scsi_inflight inflights[2];
Michael S. Tsirkin3dfbff32013-04-28 15:38:52 +0300188 /*
189 * Indicate current inflight in use, protected by vq->mutex.
190 * Writers must also take dev mutex and flush under it.
191 */
Asias Hef2f0173d2013-04-27 11:16:49 +0800192 int inflight_idx;
Asias He3ab2e422013-04-27 11:16:48 +0800193};
194
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700195struct vhost_scsi {
Asias He67e18cf2013-02-05 12:31:57 +0800196 /* Protected by vhost_scsi->dev.mutex */
Asias He4f7f46d2013-04-03 14:17:37 +0800197 struct tcm_vhost_tpg **vs_tpg;
Asias He67e18cf2013-02-05 12:31:57 +0800198 char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
Asias He67e18cf2013-02-05 12:31:57 +0800199
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700200 struct vhost_dev dev;
Asias He3ab2e422013-04-27 11:16:48 +0800201 struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ];
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700202
203 struct vhost_work vs_completion_work; /* cmd completion work item */
Asias He9d6064a2013-01-06 14:36:13 +0800204 struct llist_head vs_completion_list; /* cmd completion queue */
Asias Hea6c9af82013-04-25 15:35:21 +0800205
206 struct vhost_work vs_event_work; /* evt injection work item */
207 struct llist_head vs_event_list; /* evt injection queue */
208
209 bool vs_events_missed; /* any missed events, protected by vq->mutex */
210 int vs_events_nr; /* num of pending events, protected by vq->mutex */
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700211};
212
213/* Local pointer to allocated TCM configfs fabric module */
214static struct target_fabric_configfs *tcm_vhost_fabric_configfs;
215
216static struct workqueue_struct *tcm_vhost_workqueue;
217
218/* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */
219static DEFINE_MUTEX(tcm_vhost_mutex);
220static LIST_HEAD(tcm_vhost_list);
221
Asias He765b34f2013-01-22 11:20:25 +0800222static int iov_num_pages(struct iovec *iov)
223{
224 return (PAGE_ALIGN((unsigned long)iov->iov_base + iov->iov_len) -
225 ((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT;
226}
227
Asias He0a1febf2013-06-05 21:17:38 +0800228static void tcm_vhost_done_inflight(struct kref *kref)
Asias Hef2f0173d2013-04-27 11:16:49 +0800229{
230 struct vhost_scsi_inflight *inflight;
231
232 inflight = container_of(kref, struct vhost_scsi_inflight, kref);
233 complete(&inflight->comp);
234}
235
236static void tcm_vhost_init_inflight(struct vhost_scsi *vs,
237 struct vhost_scsi_inflight *old_inflight[])
238{
239 struct vhost_scsi_inflight *new_inflight;
240 struct vhost_virtqueue *vq;
241 int idx, i;
242
243 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
244 vq = &vs->vqs[i].vq;
245
246 mutex_lock(&vq->mutex);
247
248 /* store old infight */
249 idx = vs->vqs[i].inflight_idx;
250 if (old_inflight)
251 old_inflight[i] = &vs->vqs[i].inflights[idx];
252
253 /* setup new infight */
254 vs->vqs[i].inflight_idx = idx ^ 1;
255 new_inflight = &vs->vqs[i].inflights[idx ^ 1];
256 kref_init(&new_inflight->kref);
257 init_completion(&new_inflight->comp);
258
259 mutex_unlock(&vq->mutex);
260 }
261}
262
263static struct vhost_scsi_inflight *
264tcm_vhost_get_inflight(struct vhost_virtqueue *vq)
265{
266 struct vhost_scsi_inflight *inflight;
267 struct vhost_scsi_virtqueue *svq;
268
269 svq = container_of(vq, struct vhost_scsi_virtqueue, vq);
270 inflight = &svq->inflights[svq->inflight_idx];
271 kref_get(&inflight->kref);
272
273 return inflight;
274}
275
276static void tcm_vhost_put_inflight(struct vhost_scsi_inflight *inflight)
277{
278 kref_put(&inflight->kref, tcm_vhost_done_inflight);
279}
280
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700281static int tcm_vhost_check_true(struct se_portal_group *se_tpg)
282{
283 return 1;
284}
285
286static int tcm_vhost_check_false(struct se_portal_group *se_tpg)
287{
288 return 0;
289}
290
291static char *tcm_vhost_get_fabric_name(void)
292{
293 return "vhost";
294}
295
296static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg)
297{
298 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
299 struct tcm_vhost_tpg, se_tpg);
300 struct tcm_vhost_tport *tport = tpg->tport;
301
302 switch (tport->tport_proto_id) {
303 case SCSI_PROTOCOL_SAS:
304 return sas_get_fabric_proto_ident(se_tpg);
305 case SCSI_PROTOCOL_FCP:
306 return fc_get_fabric_proto_ident(se_tpg);
307 case SCSI_PROTOCOL_ISCSI:
308 return iscsi_get_fabric_proto_ident(se_tpg);
309 default:
310 pr_err("Unknown tport_proto_id: 0x%02x, using"
311 " SAS emulation\n", tport->tport_proto_id);
312 break;
313 }
314
315 return sas_get_fabric_proto_ident(se_tpg);
316}
317
318static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg)
319{
320 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
321 struct tcm_vhost_tpg, se_tpg);
322 struct tcm_vhost_tport *tport = tpg->tport;
323
324 return &tport->tport_name[0];
325}
326
327static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg)
328{
329 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
330 struct tcm_vhost_tpg, se_tpg);
331 return tpg->tport_tpgt;
332}
333
334static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg)
335{
336 return 1;
337}
338
Asias He683bd962013-05-06 16:38:27 +0800339static u32
340tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg,
341 struct se_node_acl *se_nacl,
342 struct t10_pr_registration *pr_reg,
343 int *format_code,
344 unsigned char *buf)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700345{
346 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
347 struct tcm_vhost_tpg, se_tpg);
348 struct tcm_vhost_tport *tport = tpg->tport;
349
350 switch (tport->tport_proto_id) {
351 case SCSI_PROTOCOL_SAS:
352 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
353 format_code, buf);
354 case SCSI_PROTOCOL_FCP:
355 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
356 format_code, buf);
357 case SCSI_PROTOCOL_ISCSI:
358 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
359 format_code, buf);
360 default:
361 pr_err("Unknown tport_proto_id: 0x%02x, using"
362 " SAS emulation\n", tport->tport_proto_id);
363 break;
364 }
365
366 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
367 format_code, buf);
368}
369
Asias He683bd962013-05-06 16:38:27 +0800370static u32
371tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg,
372 struct se_node_acl *se_nacl,
373 struct t10_pr_registration *pr_reg,
374 int *format_code)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700375{
376 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
377 struct tcm_vhost_tpg, se_tpg);
378 struct tcm_vhost_tport *tport = tpg->tport;
379
380 switch (tport->tport_proto_id) {
381 case SCSI_PROTOCOL_SAS:
382 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
383 format_code);
384 case SCSI_PROTOCOL_FCP:
385 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
386 format_code);
387 case SCSI_PROTOCOL_ISCSI:
388 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
389 format_code);
390 default:
391 pr_err("Unknown tport_proto_id: 0x%02x, using"
392 " SAS emulation\n", tport->tport_proto_id);
393 break;
394 }
395
396 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
397 format_code);
398}
399
Asias He683bd962013-05-06 16:38:27 +0800400static char *
401tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
402 const char *buf,
403 u32 *out_tid_len,
404 char **port_nexus_ptr)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700405{
406 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
407 struct tcm_vhost_tpg, se_tpg);
408 struct tcm_vhost_tport *tport = tpg->tport;
409
410 switch (tport->tport_proto_id) {
411 case SCSI_PROTOCOL_SAS:
412 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
413 port_nexus_ptr);
414 case SCSI_PROTOCOL_FCP:
415 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
416 port_nexus_ptr);
417 case SCSI_PROTOCOL_ISCSI:
418 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
419 port_nexus_ptr);
420 default:
421 pr_err("Unknown tport_proto_id: 0x%02x, using"
422 " SAS emulation\n", tport->tport_proto_id);
423 break;
424 }
425
426 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
427 port_nexus_ptr);
428}
429
Asias He683bd962013-05-06 16:38:27 +0800430static struct se_node_acl *
431tcm_vhost_alloc_fabric_acl(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700432{
433 struct tcm_vhost_nacl *nacl;
434
435 nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL);
436 if (!nacl) {
Masanari Iida744627e92012-11-05 23:30:40 +0900437 pr_err("Unable to allocate struct tcm_vhost_nacl\n");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700438 return NULL;
439 }
440
441 return &nacl->se_node_acl;
442}
443
Asias He683bd962013-05-06 16:38:27 +0800444static void
445tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg,
446 struct se_node_acl *se_nacl)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700447{
448 struct tcm_vhost_nacl *nacl = container_of(se_nacl,
449 struct tcm_vhost_nacl, se_node_acl);
450 kfree(nacl);
451}
452
453static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg)
454{
455 return 1;
456}
457
458static void tcm_vhost_release_cmd(struct se_cmd *se_cmd)
459{
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700460 struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
461 struct tcm_vhost_cmd, tvc_se_cmd);
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700462 struct se_session *se_sess = se_cmd->se_sess;
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800463 int i;
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700464
465 if (tv_cmd->tvc_sgl_count) {
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700466 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
467 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
Michael S. Tsirkind3d665a2013-09-17 22:54:31 +0300468 }
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800469 if (tv_cmd->tvc_prot_sgl_count) {
470 for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++)
471 put_page(sg_page(&tv_cmd->tvc_prot_sgl[i]));
472 }
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700473
474 tcm_vhost_put_inflight(tv_cmd->inflight);
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700475 percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700476}
477
478static int tcm_vhost_shutdown_session(struct se_session *se_sess)
479{
480 return 0;
481}
482
483static void tcm_vhost_close_session(struct se_session *se_sess)
484{
485 return;
486}
487
488static u32 tcm_vhost_sess_get_index(struct se_session *se_sess)
489{
490 return 0;
491}
492
493static int tcm_vhost_write_pending(struct se_cmd *se_cmd)
494{
495 /* Go ahead and process the write immediately */
496 target_execute_cmd(se_cmd);
497 return 0;
498}
499
500static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd)
501{
502 return 0;
503}
504
505static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl)
506{
507 return;
508}
509
510static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd)
511{
512 return 0;
513}
514
515static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd)
516{
517 return 0;
518}
519
Asias He3c63f662013-05-06 16:38:29 +0800520static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *cmd)
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700521{
Asias He3c63f662013-05-06 16:38:29 +0800522 struct vhost_scsi *vs = cmd->tvc_vhost;
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700523
Asias He3c63f662013-05-06 16:38:29 +0800524 llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700525
526 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
527}
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700528
529static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd)
530{
Asias He3c63f662013-05-06 16:38:29 +0800531 struct tcm_vhost_cmd *cmd = container_of(se_cmd,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700532 struct tcm_vhost_cmd, tvc_se_cmd);
Asias He3c63f662013-05-06 16:38:29 +0800533 vhost_scsi_complete_cmd(cmd);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700534 return 0;
535}
536
537static int tcm_vhost_queue_status(struct se_cmd *se_cmd)
538{
Asias He3c63f662013-05-06 16:38:29 +0800539 struct tcm_vhost_cmd *cmd = container_of(se_cmd,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700540 struct tcm_vhost_cmd, tvc_se_cmd);
Asias He3c63f662013-05-06 16:38:29 +0800541 vhost_scsi_complete_cmd(cmd);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700542 return 0;
543}
544
Joern Engelb79fafa2013-07-03 11:22:17 -0400545static void tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700546{
Joern Engelb79fafa2013-07-03 11:22:17 -0400547 return;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700548}
549
Nicholas Bellinger131e6ab2014-03-22 14:55:56 -0700550static void tcm_vhost_aborted_task(struct se_cmd *se_cmd)
551{
552 return;
553}
554
Asias Hea6c9af82013-04-25 15:35:21 +0800555static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt)
556{
557 vs->vs_events_nr--;
558 kfree(evt);
559}
560
Asias He683bd962013-05-06 16:38:27 +0800561static struct tcm_vhost_evt *
562tcm_vhost_allocate_evt(struct vhost_scsi *vs,
563 u32 event, u32 reason)
Asias Hea6c9af82013-04-25 15:35:21 +0800564{
Asias He3ab2e422013-04-27 11:16:48 +0800565 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +0800566 struct tcm_vhost_evt *evt;
567
568 if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
569 vs->vs_events_missed = true;
570 return NULL;
571 }
572
573 evt = kzalloc(sizeof(*evt), GFP_KERNEL);
574 if (!evt) {
575 vq_err(vq, "Failed to allocate tcm_vhost_evt\n");
576 vs->vs_events_missed = true;
577 return NULL;
578 }
579
580 evt->event.event = event;
581 evt->event.reason = reason;
582 vs->vs_events_nr++;
583
584 return evt;
585}
586
Asias He3c63f662013-05-06 16:38:29 +0800587static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700588{
Asias He3c63f662013-05-06 16:38:29 +0800589 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700590
591 /* TODO locking against target/backend threads? */
Nicholas Bellinger6c131d02013-06-06 01:44:48 -0700592 transport_generic_free_cmd(se_cmd, 0);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700593
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700594}
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700595
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700596static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
597{
598 return target_put_sess_cmd(se_cmd->se_sess, se_cmd);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700599}
600
Asias He683bd962013-05-06 16:38:27 +0800601static void
602tcm_vhost_do_evt_work(struct vhost_scsi *vs, struct tcm_vhost_evt *evt)
Asias Hea6c9af82013-04-25 15:35:21 +0800603{
Asias He3ab2e422013-04-27 11:16:48 +0800604 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +0800605 struct virtio_scsi_event *event = &evt->event;
606 struct virtio_scsi_event __user *eventp;
607 unsigned out, in;
608 int head, ret;
609
610 if (!vq->private_data) {
611 vs->vs_events_missed = true;
612 return;
613 }
614
615again:
616 vhost_disable_notify(&vs->dev, vq);
Michael S. Tsirkin47283be2014-06-05 15:20:27 +0300617 head = vhost_get_vq_desc(vq, vq->iov,
Asias Hea6c9af82013-04-25 15:35:21 +0800618 ARRAY_SIZE(vq->iov), &out, &in,
619 NULL, NULL);
620 if (head < 0) {
621 vs->vs_events_missed = true;
622 return;
623 }
624 if (head == vq->num) {
625 if (vhost_enable_notify(&vs->dev, vq))
626 goto again;
627 vs->vs_events_missed = true;
628 return;
629 }
630
631 if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
632 vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
633 vq->iov[out].iov_len);
634 vs->vs_events_missed = true;
635 return;
636 }
637
638 if (vs->vs_events_missed) {
639 event->event |= VIRTIO_SCSI_T_EVENTS_MISSED;
640 vs->vs_events_missed = false;
641 }
642
643 eventp = vq->iov[out].iov_base;
644 ret = __copy_to_user(eventp, event, sizeof(*event));
645 if (!ret)
646 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
647 else
648 vq_err(vq, "Faulted on tcm_vhost_send_event\n");
649}
650
651static void tcm_vhost_evt_work(struct vhost_work *work)
652{
653 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
654 vs_event_work);
Asias He3ab2e422013-04-27 11:16:48 +0800655 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +0800656 struct tcm_vhost_evt *evt;
657 struct llist_node *llnode;
658
659 mutex_lock(&vq->mutex);
660 llnode = llist_del_all(&vs->vs_event_list);
661 while (llnode) {
662 evt = llist_entry(llnode, struct tcm_vhost_evt, list);
663 llnode = llist_next(llnode);
664 tcm_vhost_do_evt_work(vs, evt);
665 tcm_vhost_free_evt(vs, evt);
666 }
667 mutex_unlock(&vq->mutex);
668}
669
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700670/* Fill in status and signal that we are done processing this command
671 *
672 * This is scheduled in the vhost work queue so we are called with the owner
673 * process mm and can access the vring.
674 */
675static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
676{
677 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
678 vs_completion_work);
Asias He1b7f3902013-02-06 13:20:59 +0800679 DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
Asias He9d6064a2013-01-06 14:36:13 +0800680 struct virtio_scsi_cmd_resp v_rsp;
Asias He3c63f662013-05-06 16:38:29 +0800681 struct tcm_vhost_cmd *cmd;
Asias He9d6064a2013-01-06 14:36:13 +0800682 struct llist_node *llnode;
683 struct se_cmd *se_cmd;
Asias He1b7f3902013-02-06 13:20:59 +0800684 int ret, vq;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700685
Asias He1b7f3902013-02-06 13:20:59 +0800686 bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
Asias He9d6064a2013-01-06 14:36:13 +0800687 llnode = llist_del_all(&vs->vs_completion_list);
688 while (llnode) {
Asias He3c63f662013-05-06 16:38:29 +0800689 cmd = llist_entry(llnode, struct tcm_vhost_cmd,
Asias He9d6064a2013-01-06 14:36:13 +0800690 tvc_completion_list);
691 llnode = llist_next(llnode);
Asias He3c63f662013-05-06 16:38:29 +0800692 se_cmd = &cmd->tvc_se_cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700693
694 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
Asias He3c63f662013-05-06 16:38:29 +0800695 cmd, se_cmd->residual_count, se_cmd->scsi_status);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700696
697 memset(&v_rsp, 0, sizeof(v_rsp));
698 v_rsp.resid = se_cmd->residual_count;
699 /* TODO is status_qualifier field needed? */
700 v_rsp.status = se_cmd->scsi_status;
701 v_rsp.sense_len = se_cmd->scsi_sense_length;
Asias He3c63f662013-05-06 16:38:29 +0800702 memcpy(v_rsp.sense, cmd->tvc_sense_buf,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700703 v_rsp.sense_len);
Asias He3c63f662013-05-06 16:38:29 +0800704 ret = copy_to_user(cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
Asias He1b7f3902013-02-06 13:20:59 +0800705 if (likely(ret == 0)) {
Asias He3ab2e422013-04-27 11:16:48 +0800706 struct vhost_scsi_virtqueue *q;
Asias He3c63f662013-05-06 16:38:29 +0800707 vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
708 q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
Asias He3ab2e422013-04-27 11:16:48 +0800709 vq = q - vs->vqs;
Asias He1b7f3902013-02-06 13:20:59 +0800710 __set_bit(vq, signal);
711 } else
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700712 pr_err("Faulted on virtio_scsi_cmd_resp\n");
713
Asias He3c63f662013-05-06 16:38:29 +0800714 vhost_scsi_free_cmd(cmd);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700715 }
716
Asias He1b7f3902013-02-06 13:20:59 +0800717 vq = -1;
718 while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
719 < VHOST_SCSI_MAX_VQ)
Asias He3ab2e422013-04-27 11:16:48 +0800720 vhost_signal(&vs->dev, &vs->vqs[vq].vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700721}
722
Asias He683bd962013-05-06 16:38:27 +0800723static struct tcm_vhost_cmd *
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800724vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct tcm_vhost_tpg *tpg,
725 unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
726 u32 exp_data_len, int data_direction)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700727{
Asias He3c63f662013-05-06 16:38:29 +0800728 struct tcm_vhost_cmd *cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700729 struct tcm_vhost_nexus *tv_nexus;
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700730 struct se_session *se_sess;
Nicholas Bellingerb1935f62014-02-22 18:08:24 -0800731 struct scatterlist *sg, *prot_sg;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700732 struct page **pages;
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700733 int tag;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700734
Asias He98718312013-05-06 16:38:28 +0800735 tv_nexus = tpg->tpg_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700736 if (!tv_nexus) {
737 pr_err("Unable to locate active struct tcm_vhost_nexus\n");
738 return ERR_PTR(-EIO);
739 }
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700740 se_sess = tv_nexus->tvn_se_sess;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700741
Kent Overstreet6f6b5d12014-01-19 08:26:37 +0000742 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING);
Nicholas Bellinger4a47d3a2013-09-23 11:42:28 -0700743 if (tag < 0) {
744 pr_err("Unable to obtain tag for tcm_vhost_cmd\n");
745 return ERR_PTR(-ENOMEM);
746 }
747
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700748 cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[tag];
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700749 sg = cmd->tvc_sgl;
Nicholas Bellingerb1935f62014-02-22 18:08:24 -0800750 prot_sg = cmd->tvc_prot_sgl;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700751 pages = cmd->tvc_upages;
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700752 memset(cmd, 0, sizeof(struct tcm_vhost_cmd));
753
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700754 cmd->tvc_sgl = sg;
Nicholas Bellingerb1935f62014-02-22 18:08:24 -0800755 cmd->tvc_prot_sgl = prot_sg;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700756 cmd->tvc_upages = pages;
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700757 cmd->tvc_se_cmd.map_tag = tag;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800758 cmd->tvc_tag = scsi_tag;
759 cmd->tvc_lun = lun;
760 cmd->tvc_task_attr = task_attr;
Asias He3c63f662013-05-06 16:38:29 +0800761 cmd->tvc_exp_data_len = exp_data_len;
762 cmd->tvc_data_direction = data_direction;
763 cmd->tvc_nexus = tv_nexus;
764 cmd->inflight = tcm_vhost_get_inflight(vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700765
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800766 memcpy(cmd->tvc_cdb, cdb, TCM_VHOST_MAX_CDB_SIZE);
767
Asias He3c63f662013-05-06 16:38:29 +0800768 return cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700769}
770
771/*
772 * Map a user memory range into a scatterlist
773 *
774 * Returns the number of scatterlist entries used or -errno on error.
775 */
Asias He683bd962013-05-06 16:38:27 +0800776static int
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700777vhost_scsi_map_to_sgl(struct tcm_vhost_cmd *tv_cmd,
778 struct scatterlist *sgl,
Asias He683bd962013-05-06 16:38:27 +0800779 unsigned int sgl_count,
780 struct iovec *iov,
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800781 struct page **pages,
782 bool write)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700783{
Asias He18100532013-01-22 11:20:27 +0800784 unsigned int npages = 0, pages_nr, offset, nbytes;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700785 struct scatterlist *sg = sgl;
Asias He18100532013-01-22 11:20:27 +0800786 void __user *ptr = iov->iov_base;
787 size_t len = iov->iov_len;
Asias He18100532013-01-22 11:20:27 +0800788 int ret, i;
789
790 pages_nr = iov_num_pages(iov);
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800791 if (pages_nr > sgl_count) {
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700792 pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800793 " sgl_count: %u\n", pages_nr, sgl_count);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700794 return -ENOBUFS;
795 }
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800796 if (pages_nr > TCM_VHOST_PREALLOC_UPAGES) {
797 pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
798 " preallocated TCM_VHOST_PREALLOC_UPAGES: %u\n",
799 pages_nr, TCM_VHOST_PREALLOC_UPAGES);
800 return -ENOBUFS;
801 }
Asias He18100532013-01-22 11:20:27 +0800802
803 ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
804 /* No pages were pinned */
805 if (ret < 0)
806 goto out;
807 /* Less pages pinned than wanted */
808 if (ret != pages_nr) {
809 for (i = 0; i < ret; i++)
810 put_page(pages[i]);
811 ret = -EFAULT;
812 goto out;
813 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700814
815 while (len > 0) {
Asias He18100532013-01-22 11:20:27 +0800816 offset = (uintptr_t)ptr & ~PAGE_MASK;
817 nbytes = min_t(unsigned int, PAGE_SIZE - offset, len);
818 sg_set_page(sg, pages[npages], nbytes, offset);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700819 ptr += nbytes;
820 len -= nbytes;
821 sg++;
822 npages++;
823 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700824
Asias He18100532013-01-22 11:20:27 +0800825out:
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700826 return ret;
827}
828
Asias He683bd962013-05-06 16:38:27 +0800829static int
Asias He3c63f662013-05-06 16:38:29 +0800830vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *cmd,
Asias He683bd962013-05-06 16:38:27 +0800831 struct iovec *iov,
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800832 int niov,
833 bool write)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700834{
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800835 struct scatterlist *sg = cmd->tvc_sgl;
836 unsigned int sgl_count = 0;
837 int ret, i;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700838
Asias Hef3158f32013-01-22 11:20:26 +0800839 for (i = 0; i < niov; i++)
840 sgl_count += iov_num_pages(&iov[i]);
841
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800842 if (sgl_count > TCM_VHOST_PREALLOC_SGLS) {
843 pr_err("vhost_scsi_map_iov_to_sgl() sgl_count: %u greater than"
844 " preallocated TCM_VHOST_PREALLOC_SGLS: %u\n",
845 sgl_count, TCM_VHOST_PREALLOC_SGLS);
846 return -ENOBUFS;
847 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700848
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700849 pr_debug("%s sg %p sgl_count %u\n", __func__, sg, sgl_count);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700850 sg_init_table(sg, sgl_count);
Asias He3c63f662013-05-06 16:38:29 +0800851 cmd->tvc_sgl_count = sgl_count;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700852
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800853 pr_debug("Mapping iovec %p for %u pages\n", &iov[0], sgl_count);
854
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700855 for (i = 0; i < niov; i++) {
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700856 ret = vhost_scsi_map_to_sgl(cmd, sg, sgl_count, &iov[i],
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800857 cmd->tvc_upages, write);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700858 if (ret < 0) {
Asias He3c63f662013-05-06 16:38:29 +0800859 for (i = 0; i < cmd->tvc_sgl_count; i++)
860 put_page(sg_page(&cmd->tvc_sgl[i]));
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700861
Asias He3c63f662013-05-06 16:38:29 +0800862 cmd->tvc_sgl_count = 0;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700863 return ret;
864 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700865 sg += ret;
866 sgl_count -= ret;
867 }
868 return 0;
869}
870
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800871static int
872vhost_scsi_map_iov_to_prot(struct tcm_vhost_cmd *cmd,
873 struct iovec *iov,
874 int niov,
875 bool write)
876{
877 struct scatterlist *prot_sg = cmd->tvc_prot_sgl;
878 unsigned int prot_sgl_count = 0;
879 int ret, i;
880
881 for (i = 0; i < niov; i++)
882 prot_sgl_count += iov_num_pages(&iov[i]);
883
884 if (prot_sgl_count > TCM_VHOST_PREALLOC_PROT_SGLS) {
885 pr_err("vhost_scsi_map_iov_to_prot() sgl_count: %u greater than"
886 " preallocated TCM_VHOST_PREALLOC_PROT_SGLS: %u\n",
887 prot_sgl_count, TCM_VHOST_PREALLOC_PROT_SGLS);
888 return -ENOBUFS;
889 }
890
891 pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
892 prot_sg, prot_sgl_count);
893 sg_init_table(prot_sg, prot_sgl_count);
894 cmd->tvc_prot_sgl_count = prot_sgl_count;
895
896 for (i = 0; i < niov; i++) {
897 ret = vhost_scsi_map_to_sgl(cmd, prot_sg, prot_sgl_count, &iov[i],
898 cmd->tvc_upages, write);
899 if (ret < 0) {
900 for (i = 0; i < cmd->tvc_prot_sgl_count; i++)
901 put_page(sg_page(&cmd->tvc_prot_sgl[i]));
902
903 cmd->tvc_prot_sgl_count = 0;
904 return ret;
905 }
906 prot_sg += ret;
907 prot_sgl_count -= ret;
908 }
909 return 0;
910}
911
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700912static void tcm_vhost_submission_work(struct work_struct *work)
913{
Asias He3c63f662013-05-06 16:38:29 +0800914 struct tcm_vhost_cmd *cmd =
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700915 container_of(work, struct tcm_vhost_cmd, work);
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700916 struct tcm_vhost_nexus *tv_nexus;
Asias He3c63f662013-05-06 16:38:29 +0800917 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800918 struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
919 int rc;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700920
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800921 /* FIXME: BIDI operation */
Asias He3c63f662013-05-06 16:38:29 +0800922 if (cmd->tvc_sgl_count) {
923 sg_ptr = cmd->tvc_sgl;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800924
925 if (cmd->tvc_prot_sgl_count)
926 sg_prot_ptr = cmd->tvc_prot_sgl;
927 else
928 se_cmd->prot_pto = true;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700929 } else {
930 sg_ptr = NULL;
931 }
Asias He3c63f662013-05-06 16:38:29 +0800932 tv_nexus = cmd->tvc_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700933
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700934 rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
Asias He3c63f662013-05-06 16:38:29 +0800935 cmd->tvc_cdb, &cmd->tvc_sense_buf[0],
936 cmd->tvc_lun, cmd->tvc_exp_data_len,
937 cmd->tvc_task_attr, cmd->tvc_data_direction,
Linus Torvalds6d2fa9e2013-07-11 12:57:19 -0700938 TARGET_SCF_ACK_KREF, sg_ptr, cmd->tvc_sgl_count,
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800939 NULL, 0, sg_prot_ptr, cmd->tvc_prot_sgl_count);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700940 if (rc < 0) {
941 transport_send_check_condition_and_sense(se_cmd,
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700942 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700943 transport_generic_free_cmd(se_cmd, 0);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700944 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700945}
946
Asias He683bd962013-05-06 16:38:27 +0800947static void
948vhost_scsi_send_bad_target(struct vhost_scsi *vs,
949 struct vhost_virtqueue *vq,
950 int head, unsigned out)
Asias He637ab212013-04-10 15:06:15 +0800951{
952 struct virtio_scsi_cmd_resp __user *resp;
953 struct virtio_scsi_cmd_resp rsp;
954 int ret;
955
956 memset(&rsp, 0, sizeof(rsp));
957 rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
958 resp = vq->iov[out].iov_base;
959 ret = __copy_to_user(resp, &rsp, sizeof(rsp));
960 if (!ret)
961 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
962 else
963 pr_err("Faulted on virtio_scsi_cmd_resp\n");
964}
965
Asias He683bd962013-05-06 16:38:27 +0800966static void
967vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700968{
Asias He4f7f46d2013-04-03 14:17:37 +0800969 struct tcm_vhost_tpg **vs_tpg;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700970 struct virtio_scsi_cmd_req v_req;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800971 struct virtio_scsi_cmd_req_pi v_req_pi;
Asias He98718312013-05-06 16:38:28 +0800972 struct tcm_vhost_tpg *tpg;
Asias He3c63f662013-05-06 16:38:29 +0800973 struct tcm_vhost_cmd *cmd;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800974 u64 tag;
975 u32 exp_data_len, data_first, data_num, data_direction, prot_first;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700976 unsigned out, in, i;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800977 int head, ret, data_niov, prot_niov, prot_bytes;
978 size_t req_size;
979 u16 lun;
980 u8 *target, *lunp, task_attr;
981 bool hdr_pi;
982 void *req, *cdb;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700983
Asias Hee7802212013-05-07 14:54:35 +0800984 mutex_lock(&vq->mutex);
Asias He4f7f46d2013-04-03 14:17:37 +0800985 /*
986 * We can handle the vq only after the endpoint is setup by calling the
987 * VHOST_SCSI_SET_ENDPOINT ioctl.
Asias He4f7f46d2013-04-03 14:17:37 +0800988 */
Asias Hee7802212013-05-07 14:54:35 +0800989 vs_tpg = vq->private_data;
Asias He4f7f46d2013-04-03 14:17:37 +0800990 if (!vs_tpg)
Asias Hee7802212013-05-07 14:54:35 +0800991 goto out;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700992
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700993 vhost_disable_notify(&vs->dev, vq);
994
995 for (;;) {
Michael S. Tsirkin47283be2014-06-05 15:20:27 +0300996 head = vhost_get_vq_desc(vq, vq->iov,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700997 ARRAY_SIZE(vq->iov), &out, &in,
998 NULL, NULL);
999 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
1000 head, out, in);
1001 /* On error, stop handling until the next kick. */
1002 if (unlikely(head < 0))
1003 break;
1004 /* Nothing new? Wait for eventfd to tell us they refilled. */
1005 if (head == vq->num) {
1006 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
1007 vhost_disable_notify(&vs->dev, vq);
1008 continue;
1009 }
1010 break;
1011 }
1012
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001013 /* FIXME: BIDI operation */
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001014 if (out == 1 && in == 1) {
1015 data_direction = DMA_NONE;
1016 data_first = 0;
1017 data_num = 0;
1018 } else if (out == 1 && in > 1) {
1019 data_direction = DMA_FROM_DEVICE;
1020 data_first = out + 1;
1021 data_num = in - 1;
1022 } else if (out > 1 && in == 1) {
1023 data_direction = DMA_TO_DEVICE;
1024 data_first = 1;
1025 data_num = out - 1;
1026 } else {
1027 vq_err(vq, "Invalid buffer layout out: %u in: %u\n",
1028 out, in);
1029 break;
1030 }
1031
1032 /*
1033 * Check for a sane resp buffer so we can report errors to
1034 * the guest.
1035 */
1036 if (unlikely(vq->iov[out].iov_len !=
1037 sizeof(struct virtio_scsi_cmd_resp))) {
1038 vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
1039 " bytes\n", vq->iov[out].iov_len);
1040 break;
1041 }
1042
Linus Torvaldsed9ea4e2014-06-12 22:38:32 -07001043 if (vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI)) {
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001044 req = &v_req_pi;
1045 lunp = &v_req_pi.lun[0];
1046 target = &v_req_pi.lun[1];
1047 req_size = sizeof(v_req_pi);
1048 hdr_pi = true;
1049 } else {
1050 req = &v_req;
1051 lunp = &v_req.lun[0];
1052 target = &v_req.lun[1];
1053 req_size = sizeof(v_req);
1054 hdr_pi = false;
1055 }
1056
1057 if (unlikely(vq->iov[0].iov_len < req_size)) {
1058 pr_err("Expecting virtio-scsi header: %zu, got %zu\n",
1059 req_size, vq->iov[0].iov_len);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001060 break;
1061 }
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001062 ret = memcpy_fromiovecend(req, &vq->iov[0], 0, req_size);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001063 if (unlikely(ret)) {
1064 vq_err(vq, "Faulted on virtio_scsi_cmd_req\n");
1065 break;
1066 }
1067
Venkatesh Srinivas7fe412d2014-02-24 14:13:32 -08001068 /* virtio-scsi spec requires byte 0 of the lun to be 1 */
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001069 if (unlikely(*lunp != 1)) {
Venkatesh Srinivas7fe412d2014-02-24 14:13:32 -08001070 vhost_scsi_send_bad_target(vs, vq, head, out);
1071 continue;
1072 }
1073
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001074 tpg = ACCESS_ONCE(vs_tpg[*target]);
Asias He67e18cf2013-02-05 12:31:57 +08001075
1076 /* Target does not exist, fail the request */
Asias He98718312013-05-06 16:38:28 +08001077 if (unlikely(!tpg)) {
Asias He637ab212013-04-10 15:06:15 +08001078 vhost_scsi_send_bad_target(vs, vq, head, out);
Asias He67e18cf2013-02-05 12:31:57 +08001079 continue;
1080 }
1081
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001082 data_niov = data_num;
1083 prot_niov = prot_first = prot_bytes = 0;
1084 /*
1085 * Determine if any protection information iovecs are preceeding
1086 * the actual data payload, and adjust data_first + data_niov
1087 * values accordingly for vhost_scsi_map_iov_to_sgl() below.
1088 *
1089 * Also extract virtio_scsi header bits for vhost_scsi_get_tag()
1090 */
1091 if (hdr_pi) {
1092 if (v_req_pi.pi_bytesout) {
1093 if (data_direction != DMA_TO_DEVICE) {
1094 vq_err(vq, "Received non zero do_pi_niov"
1095 ", but wrong data_direction\n");
1096 goto err_cmd;
1097 }
1098 prot_bytes = v_req_pi.pi_bytesout;
1099 } else if (v_req_pi.pi_bytesin) {
1100 if (data_direction != DMA_FROM_DEVICE) {
1101 vq_err(vq, "Received non zero di_pi_niov"
1102 ", but wrong data_direction\n");
1103 goto err_cmd;
1104 }
1105 prot_bytes = v_req_pi.pi_bytesin;
1106 }
1107 if (prot_bytes) {
1108 int tmp = 0;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001109
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001110 for (i = 0; i < data_num; i++) {
1111 tmp += vq->iov[data_first + i].iov_len;
1112 prot_niov++;
1113 if (tmp >= prot_bytes)
1114 break;
1115 }
1116 prot_first = data_first;
1117 data_first += prot_niov;
1118 data_niov = data_num - prot_niov;
1119 }
1120 tag = v_req_pi.tag;
1121 task_attr = v_req_pi.task_attr;
1122 cdb = &v_req_pi.cdb[0];
1123 lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
1124 } else {
1125 tag = v_req.tag;
1126 task_attr = v_req.task_attr;
1127 cdb = &v_req.cdb[0];
1128 lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
1129 }
1130 exp_data_len = 0;
1131 for (i = 0; i < data_niov; i++)
1132 exp_data_len += vq->iov[data_first + i].iov_len;
1133 /*
1134 * Check that the recieved CDB size does not exceeded our
1135 * hardcoded max for vhost-scsi
1136 *
1137 * TODO what if cdb was too small for varlen cdb header?
1138 */
1139 if (unlikely(scsi_command_size(cdb) > TCM_VHOST_MAX_CDB_SIZE)) {
1140 vq_err(vq, "Received SCSI CDB with command_size: %d that"
1141 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1142 scsi_command_size(cdb), TCM_VHOST_MAX_CDB_SIZE);
1143 goto err_cmd;
1144 }
1145
1146 cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr,
Nicholas Bellinger9f977ef2014-06-10 01:19:38 -07001147 exp_data_len + prot_bytes,
1148 data_direction);
Asias He3c63f662013-05-06 16:38:29 +08001149 if (IS_ERR(cmd)) {
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -07001150 vq_err(vq, "vhost_scsi_get_tag failed %ld\n",
Asias He3c63f662013-05-06 16:38:29 +08001151 PTR_ERR(cmd));
Asias He055f6482013-04-10 15:06:16 +08001152 goto err_cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001153 }
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001154
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001155 pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
Asias He3c63f662013-05-06 16:38:29 +08001156 ": %d\n", cmd, exp_data_len, data_direction);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001157
Asias He3c63f662013-05-06 16:38:29 +08001158 cmd->tvc_vhost = vs;
1159 cmd->tvc_vq = vq;
1160 cmd->tvc_resp = vq->iov[out].iov_base;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001161
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001162 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
Asias He3c63f662013-05-06 16:38:29 +08001163 cmd->tvc_cdb[0], cmd->tvc_lun);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001164
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001165 if (prot_niov) {
1166 ret = vhost_scsi_map_iov_to_prot(cmd,
1167 &vq->iov[prot_first], prot_niov,
1168 data_direction == DMA_FROM_DEVICE);
1169 if (unlikely(ret)) {
1170 vq_err(vq, "Failed to map iov to"
1171 " prot_sgl\n");
1172 goto err_free;
1173 }
1174 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001175 if (data_direction != DMA_NONE) {
Asias He3c63f662013-05-06 16:38:29 +08001176 ret = vhost_scsi_map_iov_to_sgl(cmd,
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001177 &vq->iov[data_first], data_niov,
Nicholas Bellinger60a01f52013-10-25 10:44:15 -07001178 data_direction == DMA_FROM_DEVICE);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001179 if (unlikely(ret)) {
1180 vq_err(vq, "Failed to map iov to sgl\n");
Asias He055f6482013-04-10 15:06:16 +08001181 goto err_free;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001182 }
1183 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001184 /*
1185 * Save the descriptor from vhost_get_vq_desc() to be used to
1186 * complete the virtio-scsi request in TCM callback context via
1187 * tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
1188 */
Asias He3c63f662013-05-06 16:38:29 +08001189 cmd->tvc_vq_desc = head;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001190 /*
1191 * Dispatch tv_cmd descriptor for cmwq execution in process
1192 * context provided by tcm_vhost_workqueue. This also ensures
1193 * tv_cmd is executed on the same kworker CPU as this vhost
1194 * thread to gain positive L2 cache locality effects..
1195 */
Asias He3c63f662013-05-06 16:38:29 +08001196 INIT_WORK(&cmd->work, tcm_vhost_submission_work);
1197 queue_work(tcm_vhost_workqueue, &cmd->work);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001198 }
1199
1200 mutex_unlock(&vq->mutex);
Asias He7ea206c2013-04-10 15:06:14 +08001201 return;
1202
Asias He055f6482013-04-10 15:06:16 +08001203err_free:
Asias He3c63f662013-05-06 16:38:29 +08001204 vhost_scsi_free_cmd(cmd);
Asias He055f6482013-04-10 15:06:16 +08001205err_cmd:
1206 vhost_scsi_send_bad_target(vs, vq, head, out);
Asias Hee7802212013-05-07 14:54:35 +08001207out:
Asias He7ea206c2013-04-10 15:06:14 +08001208 mutex_unlock(&vq->mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001209}
1210
1211static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
1212{
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001213 pr_debug("%s: The handling func for control queue.\n", __func__);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001214}
1215
Asias He683bd962013-05-06 16:38:27 +08001216static void
1217tcm_vhost_send_evt(struct vhost_scsi *vs,
1218 struct tcm_vhost_tpg *tpg,
1219 struct se_lun *lun,
1220 u32 event,
1221 u32 reason)
Asias Hea6c9af82013-04-25 15:35:21 +08001222{
1223 struct tcm_vhost_evt *evt;
1224
1225 evt = tcm_vhost_allocate_evt(vs, event, reason);
1226 if (!evt)
1227 return;
1228
1229 if (tpg && lun) {
1230 /* TODO: share lun setup code with virtio-scsi.ko */
1231 /*
1232 * Note: evt->event is zeroed when we allocate it and
1233 * lun[4-7] need to be zero according to virtio-scsi spec.
1234 */
1235 evt->event.lun[0] = 0x01;
1236 evt->event.lun[1] = tpg->tport_tpgt & 0xFF;
1237 if (lun->unpacked_lun >= 256)
1238 evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
1239 evt->event.lun[3] = lun->unpacked_lun & 0xFF;
1240 }
1241
1242 llist_add(&evt->list, &vs->vs_event_list);
1243 vhost_work_queue(&vs->dev, &vs->vs_event_work);
1244}
1245
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001246static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
1247{
Asias Hea6c9af82013-04-25 15:35:21 +08001248 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1249 poll.work);
1250 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1251
1252 mutex_lock(&vq->mutex);
1253 if (!vq->private_data)
1254 goto out;
1255
1256 if (vs->vs_events_missed)
1257 tcm_vhost_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
1258out:
1259 mutex_unlock(&vq->mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001260}
1261
1262static void vhost_scsi_handle_kick(struct vhost_work *work)
1263{
1264 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1265 poll.work);
1266 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1267
Asias He1b7f3902013-02-06 13:20:59 +08001268 vhost_scsi_handle_vq(vs, vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001269}
1270
Asias He4f7f46d2013-04-03 14:17:37 +08001271static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
1272{
Asias He3ab2e422013-04-27 11:16:48 +08001273 vhost_poll_flush(&vs->vqs[index].vq.poll);
Asias He4f7f46d2013-04-03 14:17:37 +08001274}
1275
Michael S. Tsirkin3dfbff32013-04-28 15:38:52 +03001276/* Callers must hold dev mutex */
Asias He4f7f46d2013-04-03 14:17:37 +08001277static void vhost_scsi_flush(struct vhost_scsi *vs)
1278{
Asias Hef2f0173d2013-04-27 11:16:49 +08001279 struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];
Asias He4f7f46d2013-04-03 14:17:37 +08001280 int i;
1281
Asias Hef2f0173d2013-04-27 11:16:49 +08001282 /* Init new inflight and remember the old inflight */
1283 tcm_vhost_init_inflight(vs, old_inflight);
1284
1285 /*
1286 * The inflight->kref was initialized to 1. We decrement it here to
1287 * indicate the start of the flush operation so that it will reach 0
1288 * when all the reqs are finished.
1289 */
1290 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1291 kref_put(&old_inflight[i]->kref, tcm_vhost_done_inflight);
1292
1293 /* Flush both the vhost poll and vhost work */
Asias He4f7f46d2013-04-03 14:17:37 +08001294 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1295 vhost_scsi_flush_vq(vs, i);
1296 vhost_work_flush(&vs->dev, &vs->vs_completion_work);
Asias Hea6c9af82013-04-25 15:35:21 +08001297 vhost_work_flush(&vs->dev, &vs->vs_event_work);
Asias Hef2f0173d2013-04-27 11:16:49 +08001298
1299 /* Wait for all reqs issued before the flush to be finished */
1300 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1301 wait_for_completion(&old_inflight[i]->comp);
Asias He4f7f46d2013-04-03 14:17:37 +08001302}
1303
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001304/*
1305 * Called from vhost_scsi_ioctl() context to walk the list of available
1306 * tcm_vhost_tpg with an active struct tcm_vhost_nexus
Asias Hef2b7daf2013-04-25 15:35:20 +08001307 *
1308 * The lock nesting rule is:
1309 * tcm_vhost_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001310 */
Asias He683bd962013-05-06 16:38:27 +08001311static int
1312vhost_scsi_set_endpoint(struct vhost_scsi *vs,
1313 struct vhost_scsi_target *t)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001314{
1315 struct tcm_vhost_tport *tv_tport;
Asias He98718312013-05-06 16:38:28 +08001316 struct tcm_vhost_tpg *tpg;
Asias He4f7f46d2013-04-03 14:17:37 +08001317 struct tcm_vhost_tpg **vs_tpg;
1318 struct vhost_virtqueue *vq;
1319 int index, ret, i, len;
Asias He67e18cf2013-02-05 12:31:57 +08001320 bool match = false;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001321
Asias Hef2b7daf2013-04-25 15:35:20 +08001322 mutex_lock(&tcm_vhost_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001323 mutex_lock(&vs->dev.mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001324
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001325 /* Verify that ring has been setup correctly. */
1326 for (index = 0; index < vs->dev.nvqs; ++index) {
1327 /* Verify that ring has been setup correctly. */
Asias He3ab2e422013-04-27 11:16:48 +08001328 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
Asias Hef2b7daf2013-04-25 15:35:20 +08001329 ret = -EFAULT;
1330 goto out;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001331 }
1332 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001333
Asias He4f7f46d2013-04-03 14:17:37 +08001334 len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
1335 vs_tpg = kzalloc(len, GFP_KERNEL);
1336 if (!vs_tpg) {
Asias Hef2b7daf2013-04-25 15:35:20 +08001337 ret = -ENOMEM;
1338 goto out;
Asias He4f7f46d2013-04-03 14:17:37 +08001339 }
1340 if (vs->vs_tpg)
1341 memcpy(vs_tpg, vs->vs_tpg, len);
1342
Asias He98718312013-05-06 16:38:28 +08001343 list_for_each_entry(tpg, &tcm_vhost_list, tv_tpg_list) {
1344 mutex_lock(&tpg->tv_tpg_mutex);
1345 if (!tpg->tpg_nexus) {
1346 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001347 continue;
1348 }
Asias He98718312013-05-06 16:38:28 +08001349 if (tpg->tv_tpg_vhost_count != 0) {
1350 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001351 continue;
1352 }
Asias He98718312013-05-06 16:38:28 +08001353 tv_tport = tpg->tport;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001354
Asias He67e18cf2013-02-05 12:31:57 +08001355 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
Asias He98718312013-05-06 16:38:28 +08001356 if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
Asias He4f7f46d2013-04-03 14:17:37 +08001357 kfree(vs_tpg);
Asias He98718312013-05-06 16:38:28 +08001358 mutex_unlock(&tpg->tv_tpg_mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001359 ret = -EEXIST;
1360 goto out;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001361 }
Asias He98718312013-05-06 16:38:28 +08001362 tpg->tv_tpg_vhost_count++;
1363 tpg->vhost_scsi = vs;
1364 vs_tpg[tpg->tport_tpgt] = tpg;
Peter Zijlstra4e857c52014-03-17 18:06:10 +01001365 smp_mb__after_atomic();
Asias He67e18cf2013-02-05 12:31:57 +08001366 match = true;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001367 }
Asias He98718312013-05-06 16:38:28 +08001368 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001369 }
Asias He67e18cf2013-02-05 12:31:57 +08001370
1371 if (match) {
1372 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1373 sizeof(vs->vs_vhost_wwpn));
Asias He4f7f46d2013-04-03 14:17:37 +08001374 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
Asias He3ab2e422013-04-27 11:16:48 +08001375 vq = &vs->vqs[i].vq;
Asias He4f7f46d2013-04-03 14:17:37 +08001376 mutex_lock(&vq->mutex);
Asias He22fa90c2013-05-07 14:54:36 +08001377 vq->private_data = vs_tpg;
Asias Hedfd5d562013-04-03 14:17:38 +08001378 vhost_init_used(vq);
Asias He4f7f46d2013-04-03 14:17:37 +08001379 mutex_unlock(&vq->mutex);
1380 }
Asias He67e18cf2013-02-05 12:31:57 +08001381 ret = 0;
1382 } else {
1383 ret = -EEXIST;
1384 }
1385
Asias He4f7f46d2013-04-03 14:17:37 +08001386 /*
1387 * Act as synchronize_rcu to make sure access to
1388 * old vs->vs_tpg is finished.
1389 */
1390 vhost_scsi_flush(vs);
1391 kfree(vs->vs_tpg);
1392 vs->vs_tpg = vs_tpg;
1393
Asias Hef2b7daf2013-04-25 15:35:20 +08001394out:
Asias He67e18cf2013-02-05 12:31:57 +08001395 mutex_unlock(&vs->dev.mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001396 mutex_unlock(&tcm_vhost_mutex);
Asias He67e18cf2013-02-05 12:31:57 +08001397 return ret;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001398}
1399
Asias He683bd962013-05-06 16:38:27 +08001400static int
1401vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
1402 struct vhost_scsi_target *t)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001403{
1404 struct tcm_vhost_tport *tv_tport;
Asias He98718312013-05-06 16:38:28 +08001405 struct tcm_vhost_tpg *tpg;
Asias He4f7f46d2013-04-03 14:17:37 +08001406 struct vhost_virtqueue *vq;
1407 bool match = false;
Asias He67e18cf2013-02-05 12:31:57 +08001408 int index, ret, i;
1409 u8 target;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001410
Asias Hef2b7daf2013-04-25 15:35:20 +08001411 mutex_lock(&tcm_vhost_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001412 mutex_lock(&vs->dev.mutex);
1413 /* Verify that ring has been setup correctly. */
1414 for (index = 0; index < vs->dev.nvqs; ++index) {
Asias He3ab2e422013-04-27 11:16:48 +08001415 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001416 ret = -EFAULT;
Asias He038e0af2013-03-15 09:14:05 +08001417 goto err_dev;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001418 }
1419 }
Asias He4f7f46d2013-04-03 14:17:37 +08001420
1421 if (!vs->vs_tpg) {
Asias Hef2b7daf2013-04-25 15:35:20 +08001422 ret = 0;
1423 goto err_dev;
Asias He4f7f46d2013-04-03 14:17:37 +08001424 }
1425
Asias He67e18cf2013-02-05 12:31:57 +08001426 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1427 target = i;
Asias He98718312013-05-06 16:38:28 +08001428 tpg = vs->vs_tpg[target];
1429 if (!tpg)
Asias He67e18cf2013-02-05 12:31:57 +08001430 continue;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001431
Asias He98718312013-05-06 16:38:28 +08001432 mutex_lock(&tpg->tv_tpg_mutex);
1433 tv_tport = tpg->tport;
Asias He67e18cf2013-02-05 12:31:57 +08001434 if (!tv_tport) {
1435 ret = -ENODEV;
Asias He038e0af2013-03-15 09:14:05 +08001436 goto err_tpg;
Asias He67e18cf2013-02-05 12:31:57 +08001437 }
1438
1439 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
Asias He98718312013-05-06 16:38:28 +08001440 pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
Asias He67e18cf2013-02-05 12:31:57 +08001441 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
Asias He98718312013-05-06 16:38:28 +08001442 tv_tport->tport_name, tpg->tport_tpgt,
Asias He67e18cf2013-02-05 12:31:57 +08001443 t->vhost_wwpn, t->vhost_tpgt);
1444 ret = -EINVAL;
Asias He038e0af2013-03-15 09:14:05 +08001445 goto err_tpg;
Asias He67e18cf2013-02-05 12:31:57 +08001446 }
Asias He98718312013-05-06 16:38:28 +08001447 tpg->tv_tpg_vhost_count--;
1448 tpg->vhost_scsi = NULL;
Asias He67e18cf2013-02-05 12:31:57 +08001449 vs->vs_tpg[target] = NULL;
Asias He4f7f46d2013-04-03 14:17:37 +08001450 match = true;
Asias He98718312013-05-06 16:38:28 +08001451 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001452 }
Asias He4f7f46d2013-04-03 14:17:37 +08001453 if (match) {
1454 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
Asias He3ab2e422013-04-27 11:16:48 +08001455 vq = &vs->vqs[i].vq;
Asias He4f7f46d2013-04-03 14:17:37 +08001456 mutex_lock(&vq->mutex);
Asias He22fa90c2013-05-07 14:54:36 +08001457 vq->private_data = NULL;
Asias He4f7f46d2013-04-03 14:17:37 +08001458 mutex_unlock(&vq->mutex);
1459 }
1460 }
1461 /*
1462 * Act as synchronize_rcu to make sure access to
1463 * old vs->vs_tpg is finished.
1464 */
1465 vhost_scsi_flush(vs);
1466 kfree(vs->vs_tpg);
1467 vs->vs_tpg = NULL;
Asias Hea6c9af82013-04-25 15:35:21 +08001468 WARN_ON(vs->vs_events_nr);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001469 mutex_unlock(&vs->dev.mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001470 mutex_unlock(&tcm_vhost_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001471 return 0;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001472
Asias He038e0af2013-03-15 09:14:05 +08001473err_tpg:
Asias He98718312013-05-06 16:38:28 +08001474 mutex_unlock(&tpg->tv_tpg_mutex);
Asias He038e0af2013-03-15 09:14:05 +08001475err_dev:
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001476 mutex_unlock(&vs->dev.mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001477 mutex_unlock(&tcm_vhost_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001478 return ret;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001479}
1480
Asias He4f7f46d2013-04-03 14:17:37 +08001481static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1482{
Michael S. Tsirkinea16c512014-06-05 15:20:23 +03001483 struct vhost_virtqueue *vq;
1484 int i;
1485
Asias He4f7f46d2013-04-03 14:17:37 +08001486 if (features & ~VHOST_SCSI_FEATURES)
1487 return -EOPNOTSUPP;
1488
1489 mutex_lock(&vs->dev.mutex);
1490 if ((features & (1 << VHOST_F_LOG_ALL)) &&
1491 !vhost_log_access_ok(&vs->dev)) {
1492 mutex_unlock(&vs->dev.mutex);
1493 return -EFAULT;
1494 }
Michael S. Tsirkinea16c512014-06-05 15:20:23 +03001495
1496 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1497 vq = &vs->vqs[i].vq;
1498 mutex_lock(&vq->mutex);
1499 vq->acked_features = features;
1500 mutex_unlock(&vq->mutex);
1501 }
Asias He4f7f46d2013-04-03 14:17:37 +08001502 mutex_unlock(&vs->dev.mutex);
1503 return 0;
1504}
1505
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001506static int vhost_scsi_open(struct inode *inode, struct file *f)
1507{
Asias Hec7289312013-05-06 16:38:26 +08001508 struct vhost_scsi *vs;
Asias He3ab2e422013-04-27 11:16:48 +08001509 struct vhost_virtqueue **vqs;
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001510 int r = -ENOMEM, i;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001511
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001512 vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
1513 if (!vs) {
1514 vs = vzalloc(sizeof(*vs));
1515 if (!vs)
1516 goto err_vs;
1517 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001518
Asias He3ab2e422013-04-27 11:16:48 +08001519 vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL);
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001520 if (!vqs)
1521 goto err_vqs;
Asias He3ab2e422013-04-27 11:16:48 +08001522
Asias Hec7289312013-05-06 16:38:26 +08001523 vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);
1524 vhost_work_init(&vs->vs_event_work, tcm_vhost_evt_work);
Asias Hea6c9af82013-04-25 15:35:21 +08001525
Asias Hec7289312013-05-06 16:38:26 +08001526 vs->vs_events_nr = 0;
1527 vs->vs_events_missed = false;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001528
Asias Hec7289312013-05-06 16:38:26 +08001529 vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
1530 vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1531 vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1532 vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
Asias He3ab2e422013-04-27 11:16:48 +08001533 for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
Asias Hec7289312013-05-06 16:38:26 +08001534 vqs[i] = &vs->vqs[i].vq;
1535 vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
Asias He3ab2e422013-04-27 11:16:48 +08001536 }
Zhi Yong Wu59566b6e2013-12-07 04:13:03 +08001537 vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ);
Asias Hef2f0173d2013-04-27 11:16:49 +08001538
Asias Hec7289312013-05-06 16:38:26 +08001539 tcm_vhost_init_inflight(vs, NULL);
Asias Hef2f0173d2013-04-27 11:16:49 +08001540
Asias Hec7289312013-05-06 16:38:26 +08001541 f->private_data = vs;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001542 return 0;
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001543
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001544err_vqs:
Michael S. Tsirkin684044412014-06-12 19:00:01 +03001545 kvfree(vs);
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001546err_vs:
1547 return r;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001548}
1549
1550static int vhost_scsi_release(struct inode *inode, struct file *f)
1551{
Asias Hec7289312013-05-06 16:38:26 +08001552 struct vhost_scsi *vs = f->private_data;
Asias He67e18cf2013-02-05 12:31:57 +08001553 struct vhost_scsi_target t;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001554
Asias Hec7289312013-05-06 16:38:26 +08001555 mutex_lock(&vs->dev.mutex);
1556 memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
1557 mutex_unlock(&vs->dev.mutex);
1558 vhost_scsi_clear_endpoint(vs, &t);
1559 vhost_dev_stop(&vs->dev);
1560 vhost_dev_cleanup(&vs->dev, false);
Asias Hea6c9af82013-04-25 15:35:21 +08001561 /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
Asias Hec7289312013-05-06 16:38:26 +08001562 vhost_scsi_flush(vs);
1563 kfree(vs->dev.vqs);
Michael S. Tsirkin684044412014-06-12 19:00:01 +03001564 kvfree(vs);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001565 return 0;
1566}
1567
Asias He683bd962013-05-06 16:38:27 +08001568static long
1569vhost_scsi_ioctl(struct file *f,
1570 unsigned int ioctl,
1571 unsigned long arg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001572{
1573 struct vhost_scsi *vs = f->private_data;
1574 struct vhost_scsi_target backend;
1575 void __user *argp = (void __user *)arg;
1576 u64 __user *featurep = argp;
Asias He11c634182013-04-25 15:35:22 +08001577 u32 __user *eventsp = argp;
1578 u32 events_missed;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001579 u64 features;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001580 int r, abi_version = VHOST_SCSI_ABI_VERSION;
Asias He3ab2e422013-04-27 11:16:48 +08001581 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001582
1583 switch (ioctl) {
1584 case VHOST_SCSI_SET_ENDPOINT:
1585 if (copy_from_user(&backend, argp, sizeof backend))
1586 return -EFAULT;
Michael S. Tsirkin6de71452012-08-18 15:44:09 -07001587 if (backend.reserved != 0)
1588 return -EOPNOTSUPP;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001589
1590 return vhost_scsi_set_endpoint(vs, &backend);
1591 case VHOST_SCSI_CLEAR_ENDPOINT:
1592 if (copy_from_user(&backend, argp, sizeof backend))
1593 return -EFAULT;
Michael S. Tsirkin6de71452012-08-18 15:44:09 -07001594 if (backend.reserved != 0)
1595 return -EOPNOTSUPP;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001596
1597 return vhost_scsi_clear_endpoint(vs, &backend);
1598 case VHOST_SCSI_GET_ABI_VERSION:
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001599 if (copy_to_user(argp, &abi_version, sizeof abi_version))
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001600 return -EFAULT;
1601 return 0;
Asias He11c634182013-04-25 15:35:22 +08001602 case VHOST_SCSI_SET_EVENTS_MISSED:
1603 if (get_user(events_missed, eventsp))
1604 return -EFAULT;
1605 mutex_lock(&vq->mutex);
1606 vs->vs_events_missed = events_missed;
1607 mutex_unlock(&vq->mutex);
1608 return 0;
1609 case VHOST_SCSI_GET_EVENTS_MISSED:
1610 mutex_lock(&vq->mutex);
1611 events_missed = vs->vs_events_missed;
1612 mutex_unlock(&vq->mutex);
1613 if (put_user(events_missed, eventsp))
1614 return -EFAULT;
1615 return 0;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001616 case VHOST_GET_FEATURES:
Nicholas Bellinger5dade712013-03-27 17:23:41 -07001617 features = VHOST_SCSI_FEATURES;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001618 if (copy_to_user(featurep, &features, sizeof features))
1619 return -EFAULT;
1620 return 0;
1621 case VHOST_SET_FEATURES:
1622 if (copy_from_user(&features, featurep, sizeof features))
1623 return -EFAULT;
1624 return vhost_scsi_set_features(vs, features);
1625 default:
1626 mutex_lock(&vs->dev.mutex);
Michael S. Tsirkin935cdee2012-12-06 14:03:34 +02001627 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
1628 /* TODO: flush backend after dev ioctl. */
1629 if (r == -ENOIOCTLCMD)
1630 r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001631 mutex_unlock(&vs->dev.mutex);
1632 return r;
1633 }
1634}
1635
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001636#ifdef CONFIG_COMPAT
1637static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
1638 unsigned long arg)
1639{
1640 return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
1641}
1642#endif
1643
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001644static const struct file_operations vhost_scsi_fops = {
1645 .owner = THIS_MODULE,
1646 .release = vhost_scsi_release,
1647 .unlocked_ioctl = vhost_scsi_ioctl,
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001648#ifdef CONFIG_COMPAT
1649 .compat_ioctl = vhost_scsi_compat_ioctl,
1650#endif
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001651 .open = vhost_scsi_open,
1652 .llseek = noop_llseek,
1653};
1654
1655static struct miscdevice vhost_scsi_misc = {
1656 MISC_DYNAMIC_MINOR,
1657 "vhost-scsi",
1658 &vhost_scsi_fops,
1659};
1660
1661static int __init vhost_scsi_register(void)
1662{
1663 return misc_register(&vhost_scsi_misc);
1664}
1665
1666static int vhost_scsi_deregister(void)
1667{
1668 return misc_deregister(&vhost_scsi_misc);
1669}
1670
1671static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport)
1672{
1673 switch (tport->tport_proto_id) {
1674 case SCSI_PROTOCOL_SAS:
1675 return "SAS";
1676 case SCSI_PROTOCOL_FCP:
1677 return "FCP";
1678 case SCSI_PROTOCOL_ISCSI:
1679 return "iSCSI";
1680 default:
1681 break;
1682 }
1683
1684 return "Unknown";
1685}
1686
Asias He683bd962013-05-06 16:38:27 +08001687static void
1688tcm_vhost_do_plug(struct tcm_vhost_tpg *tpg,
1689 struct se_lun *lun, bool plug)
Asias Hea6c9af82013-04-25 15:35:21 +08001690{
1691
1692 struct vhost_scsi *vs = tpg->vhost_scsi;
1693 struct vhost_virtqueue *vq;
1694 u32 reason;
1695
1696 if (!vs)
1697 return;
1698
1699 mutex_lock(&vs->dev.mutex);
Asias Hea6c9af82013-04-25 15:35:21 +08001700
1701 if (plug)
1702 reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
1703 else
1704 reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
1705
Asias He3ab2e422013-04-27 11:16:48 +08001706 vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +08001707 mutex_lock(&vq->mutex);
Michael S. Tsirkinea16c512014-06-05 15:20:23 +03001708 if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG))
1709 tcm_vhost_send_evt(vs, tpg, lun,
1710 VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
Asias Hea6c9af82013-04-25 15:35:21 +08001711 mutex_unlock(&vq->mutex);
1712 mutex_unlock(&vs->dev.mutex);
1713}
1714
1715static void tcm_vhost_hotplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
1716{
1717 tcm_vhost_do_plug(tpg, lun, true);
1718}
1719
1720static void tcm_vhost_hotunplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
1721{
1722 tcm_vhost_do_plug(tpg, lun, false);
1723}
1724
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001725static int tcm_vhost_port_link(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +08001726 struct se_lun *lun)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001727{
Asias He98718312013-05-06 16:38:28 +08001728 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001729 struct tcm_vhost_tpg, se_tpg);
1730
Asias Hea6c9af82013-04-25 15:35:21 +08001731 mutex_lock(&tcm_vhost_mutex);
1732
Asias He98718312013-05-06 16:38:28 +08001733 mutex_lock(&tpg->tv_tpg_mutex);
1734 tpg->tv_tpg_port_count++;
1735 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001736
Asias He98718312013-05-06 16:38:28 +08001737 tcm_vhost_hotplug(tpg, lun);
Asias Hea6c9af82013-04-25 15:35:21 +08001738
1739 mutex_unlock(&tcm_vhost_mutex);
1740
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001741 return 0;
1742}
1743
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001744static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +08001745 struct se_lun *lun)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001746{
Asias He98718312013-05-06 16:38:28 +08001747 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001748 struct tcm_vhost_tpg, se_tpg);
1749
Asias Hea6c9af82013-04-25 15:35:21 +08001750 mutex_lock(&tcm_vhost_mutex);
1751
Asias He98718312013-05-06 16:38:28 +08001752 mutex_lock(&tpg->tv_tpg_mutex);
1753 tpg->tv_tpg_port_count--;
1754 mutex_unlock(&tpg->tv_tpg_mutex);
Asias Hea6c9af82013-04-25 15:35:21 +08001755
Asias He98718312013-05-06 16:38:28 +08001756 tcm_vhost_hotunplug(tpg, lun);
Asias Hea6c9af82013-04-25 15:35:21 +08001757
1758 mutex_unlock(&tcm_vhost_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001759}
1760
Asias He683bd962013-05-06 16:38:27 +08001761static struct se_node_acl *
1762tcm_vhost_make_nodeacl(struct se_portal_group *se_tpg,
1763 struct config_group *group,
1764 const char *name)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001765{
1766 struct se_node_acl *se_nacl, *se_nacl_new;
1767 struct tcm_vhost_nacl *nacl;
1768 u64 wwpn = 0;
1769 u32 nexus_depth;
1770
1771 /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1772 return ERR_PTR(-EINVAL); */
1773 se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg);
1774 if (!se_nacl_new)
1775 return ERR_PTR(-ENOMEM);
1776
1777 nexus_depth = 1;
1778 /*
1779 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1780 * when converting a NodeACL from demo mode -> explict
1781 */
1782 se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1783 name, nexus_depth);
1784 if (IS_ERR(se_nacl)) {
1785 tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new);
1786 return se_nacl;
1787 }
1788 /*
1789 * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN
1790 */
1791 nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl);
1792 nacl->iport_wwpn = wwpn;
1793
1794 return se_nacl;
1795}
1796
1797static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl)
1798{
1799 struct tcm_vhost_nacl *nacl = container_of(se_acl,
1800 struct tcm_vhost_nacl, se_node_acl);
1801 core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1802 kfree(nacl);
1803}
1804
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001805static void tcm_vhost_free_cmd_map_res(struct tcm_vhost_nexus *nexus,
1806 struct se_session *se_sess)
1807{
1808 struct tcm_vhost_cmd *tv_cmd;
1809 unsigned int i;
1810
1811 if (!se_sess->sess_cmd_map)
1812 return;
1813
1814 for (i = 0; i < TCM_VHOST_DEFAULT_TAGS; i++) {
1815 tv_cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[i];
1816
1817 kfree(tv_cmd->tvc_sgl);
Nicholas Bellingerb1935f62014-02-22 18:08:24 -08001818 kfree(tv_cmd->tvc_prot_sgl);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001819 kfree(tv_cmd->tvc_upages);
1820 }
1821}
1822
Asias He98718312013-05-06 16:38:28 +08001823static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tpg,
Asias He683bd962013-05-06 16:38:27 +08001824 const char *name)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001825{
1826 struct se_portal_group *se_tpg;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001827 struct se_session *se_sess;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001828 struct tcm_vhost_nexus *tv_nexus;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001829 struct tcm_vhost_cmd *tv_cmd;
1830 unsigned int i;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001831
Asias He98718312013-05-06 16:38:28 +08001832 mutex_lock(&tpg->tv_tpg_mutex);
1833 if (tpg->tpg_nexus) {
1834 mutex_unlock(&tpg->tv_tpg_mutex);
1835 pr_debug("tpg->tpg_nexus already exists\n");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001836 return -EEXIST;
1837 }
Asias He98718312013-05-06 16:38:28 +08001838 se_tpg = &tpg->se_tpg;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001839
1840 tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL);
1841 if (!tv_nexus) {
Asias He98718312013-05-06 16:38:28 +08001842 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001843 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1844 return -ENOMEM;
1845 }
1846 /*
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -07001847 * Initialize the struct se_session pointer and setup tagpool
1848 * for struct tcm_vhost_cmd descriptors
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001849 */
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -07001850 tv_nexus->tvn_se_sess = transport_init_session_tags(
1851 TCM_VHOST_DEFAULT_TAGS,
Nicholas Bellingere70beee2014-04-02 12:52:38 -07001852 sizeof(struct tcm_vhost_cmd),
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001853 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001854 if (IS_ERR(tv_nexus->tvn_se_sess)) {
Asias He98718312013-05-06 16:38:28 +08001855 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001856 kfree(tv_nexus);
1857 return -ENOMEM;
1858 }
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001859 se_sess = tv_nexus->tvn_se_sess;
1860 for (i = 0; i < TCM_VHOST_DEFAULT_TAGS; i++) {
1861 tv_cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[i];
1862
1863 tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) *
1864 TCM_VHOST_PREALLOC_SGLS, GFP_KERNEL);
1865 if (!tv_cmd->tvc_sgl) {
1866 mutex_unlock(&tpg->tv_tpg_mutex);
1867 pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
1868 goto out;
1869 }
1870
1871 tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) *
Nicholas Bellinger5a01d082014-02-22 18:34:08 -08001872 TCM_VHOST_PREALLOC_UPAGES, GFP_KERNEL);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001873 if (!tv_cmd->tvc_upages) {
1874 mutex_unlock(&tpg->tv_tpg_mutex);
1875 pr_err("Unable to allocate tv_cmd->tvc_upages\n");
1876 goto out;
1877 }
Nicholas Bellingerb1935f62014-02-22 18:08:24 -08001878
1879 tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) *
1880 TCM_VHOST_PREALLOC_PROT_SGLS, GFP_KERNEL);
1881 if (!tv_cmd->tvc_prot_sgl) {
1882 mutex_unlock(&tpg->tv_tpg_mutex);
1883 pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
1884 goto out;
1885 }
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001886 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001887 /*
1888 * Since we are running in 'demo mode' this call with generate a
1889 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1890 * the SCSI Initiator port name of the passed configfs group 'name'.
1891 */
1892 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1893 se_tpg, (unsigned char *)name);
1894 if (!tv_nexus->tvn_se_sess->se_node_acl) {
Asias He98718312013-05-06 16:38:28 +08001895 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001896 pr_debug("core_tpg_check_initiator_node_acl() failed"
1897 " for %s\n", name);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001898 goto out;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001899 }
1900 /*
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001901 * Now register the TCM vhost virtual I_T Nexus as active with the
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001902 * call to __transport_register_session()
1903 */
1904 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1905 tv_nexus->tvn_se_sess, tv_nexus);
Asias He98718312013-05-06 16:38:28 +08001906 tpg->tpg_nexus = tv_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001907
Asias He98718312013-05-06 16:38:28 +08001908 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001909 return 0;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001910
1911out:
1912 tcm_vhost_free_cmd_map_res(tv_nexus, se_sess);
1913 transport_free_session(se_sess);
1914 kfree(tv_nexus);
1915 return -ENOMEM;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001916}
1917
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001918static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg *tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001919{
1920 struct se_session *se_sess;
1921 struct tcm_vhost_nexus *tv_nexus;
1922
1923 mutex_lock(&tpg->tv_tpg_mutex);
1924 tv_nexus = tpg->tpg_nexus;
1925 if (!tv_nexus) {
1926 mutex_unlock(&tpg->tv_tpg_mutex);
1927 return -ENODEV;
1928 }
1929
1930 se_sess = tv_nexus->tvn_se_sess;
1931 if (!se_sess) {
1932 mutex_unlock(&tpg->tv_tpg_mutex);
1933 return -ENODEV;
1934 }
1935
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001936 if (tpg->tv_tpg_port_count != 0) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001937 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001938 pr_err("Unable to remove TCM_vhost I_T Nexus with"
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001939 " active TPG port count: %d\n",
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001940 tpg->tv_tpg_port_count);
1941 return -EBUSY;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001942 }
1943
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001944 if (tpg->tv_tpg_vhost_count != 0) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001945 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001946 pr_err("Unable to remove TCM_vhost I_T Nexus with"
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001947 " active TPG vhost count: %d\n",
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001948 tpg->tv_tpg_vhost_count);
1949 return -EBUSY;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001950 }
1951
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001952 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001953 " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport),
1954 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001955
1956 tcm_vhost_free_cmd_map_res(tv_nexus, se_sess);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001957 /*
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001958 * Release the SCSI I_T Nexus to the emulated vhost Target Port
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001959 */
1960 transport_deregister_session(tv_nexus->tvn_se_sess);
1961 tpg->tpg_nexus = NULL;
1962 mutex_unlock(&tpg->tv_tpg_mutex);
1963
1964 kfree(tv_nexus);
1965 return 0;
1966}
1967
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001968static ssize_t tcm_vhost_tpg_show_nexus(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +08001969 char *page)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001970{
Asias He98718312013-05-06 16:38:28 +08001971 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001972 struct tcm_vhost_tpg, se_tpg);
1973 struct tcm_vhost_nexus *tv_nexus;
1974 ssize_t ret;
1975
Asias He98718312013-05-06 16:38:28 +08001976 mutex_lock(&tpg->tv_tpg_mutex);
1977 tv_nexus = tpg->tpg_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001978 if (!tv_nexus) {
Asias He98718312013-05-06 16:38:28 +08001979 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001980 return -ENODEV;
1981 }
1982 ret = snprintf(page, PAGE_SIZE, "%s\n",
1983 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
Asias He98718312013-05-06 16:38:28 +08001984 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001985
1986 return ret;
1987}
1988
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001989static ssize_t tcm_vhost_tpg_store_nexus(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +08001990 const char *page,
1991 size_t count)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001992{
Asias He98718312013-05-06 16:38:28 +08001993 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001994 struct tcm_vhost_tpg, se_tpg);
Asias He98718312013-05-06 16:38:28 +08001995 struct tcm_vhost_tport *tport_wwn = tpg->tport;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001996 unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr;
1997 int ret;
1998 /*
1999 * Shutdown the active I_T nexus if 'NULL' is passed..
2000 */
2001 if (!strncmp(page, "NULL", 4)) {
Asias He98718312013-05-06 16:38:28 +08002002 ret = tcm_vhost_drop_nexus(tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002003 return (!ret) ? count : ret;
2004 }
2005 /*
2006 * Otherwise make sure the passed virtual Initiator port WWN matches
2007 * the fabric protocol_id set in tcm_vhost_make_tport(), and call
2008 * tcm_vhost_make_nexus().
2009 */
2010 if (strlen(page) >= TCM_VHOST_NAMELEN) {
2011 pr_err("Emulated NAA Sas Address: %s, exceeds"
2012 " max: %d\n", page, TCM_VHOST_NAMELEN);
2013 return -EINVAL;
2014 }
2015 snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page);
2016
2017 ptr = strstr(i_port, "naa.");
2018 if (ptr) {
2019 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
2020 pr_err("Passed SAS Initiator Port %s does not"
2021 " match target port protoid: %s\n", i_port,
2022 tcm_vhost_dump_proto_id(tport_wwn));
2023 return -EINVAL;
2024 }
2025 port_ptr = &i_port[0];
2026 goto check_newline;
2027 }
2028 ptr = strstr(i_port, "fc.");
2029 if (ptr) {
2030 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
2031 pr_err("Passed FCP Initiator Port %s does not"
2032 " match target port protoid: %s\n", i_port,
2033 tcm_vhost_dump_proto_id(tport_wwn));
2034 return -EINVAL;
2035 }
2036 port_ptr = &i_port[3]; /* Skip over "fc." */
2037 goto check_newline;
2038 }
2039 ptr = strstr(i_port, "iqn.");
2040 if (ptr) {
2041 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
2042 pr_err("Passed iSCSI Initiator Port %s does not"
2043 " match target port protoid: %s\n", i_port,
2044 tcm_vhost_dump_proto_id(tport_wwn));
2045 return -EINVAL;
2046 }
2047 port_ptr = &i_port[0];
2048 goto check_newline;
2049 }
2050 pr_err("Unable to locate prefix for emulated Initiator Port:"
2051 " %s\n", i_port);
2052 return -EINVAL;
2053 /*
2054 * Clear any trailing newline for the NAA WWN
2055 */
2056check_newline:
2057 if (i_port[strlen(i_port)-1] == '\n')
2058 i_port[strlen(i_port)-1] = '\0';
2059
Asias He98718312013-05-06 16:38:28 +08002060 ret = tcm_vhost_make_nexus(tpg, port_ptr);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002061 if (ret < 0)
2062 return ret;
2063
2064 return count;
2065}
2066
2067TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR);
2068
2069static struct configfs_attribute *tcm_vhost_tpg_attrs[] = {
2070 &tcm_vhost_tpg_nexus.attr,
2071 NULL,
2072};
2073
Asias He683bd962013-05-06 16:38:27 +08002074static struct se_portal_group *
2075tcm_vhost_make_tpg(struct se_wwn *wwn,
2076 struct config_group *group,
2077 const char *name)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002078{
2079 struct tcm_vhost_tport *tport = container_of(wwn,
2080 struct tcm_vhost_tport, tport_wwn);
2081
2082 struct tcm_vhost_tpg *tpg;
2083 unsigned long tpgt;
2084 int ret;
2085
2086 if (strstr(name, "tpgt_") != name)
2087 return ERR_PTR(-EINVAL);
2088 if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
2089 return ERR_PTR(-EINVAL);
2090
2091 tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL);
2092 if (!tpg) {
2093 pr_err("Unable to allocate struct tcm_vhost_tpg");
2094 return ERR_PTR(-ENOMEM);
2095 }
2096 mutex_init(&tpg->tv_tpg_mutex);
2097 INIT_LIST_HEAD(&tpg->tv_tpg_list);
2098 tpg->tport = tport;
2099 tpg->tport_tpgt = tpgt;
2100
2101 ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn,
2102 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
2103 if (ret < 0) {
2104 kfree(tpg);
2105 return NULL;
2106 }
2107 mutex_lock(&tcm_vhost_mutex);
2108 list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list);
2109 mutex_unlock(&tcm_vhost_mutex);
2110
2111 return &tpg->se_tpg;
2112}
2113
2114static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg)
2115{
2116 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
2117 struct tcm_vhost_tpg, se_tpg);
2118
2119 mutex_lock(&tcm_vhost_mutex);
2120 list_del(&tpg->tv_tpg_list);
2121 mutex_unlock(&tcm_vhost_mutex);
2122 /*
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002123 * Release the virtual I_T Nexus for this vhost TPG
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002124 */
2125 tcm_vhost_drop_nexus(tpg);
2126 /*
2127 * Deregister the se_tpg from TCM..
2128 */
2129 core_tpg_deregister(se_tpg);
2130 kfree(tpg);
2131}
2132
Asias He683bd962013-05-06 16:38:27 +08002133static struct se_wwn *
2134tcm_vhost_make_tport(struct target_fabric_configfs *tf,
2135 struct config_group *group,
2136 const char *name)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002137{
2138 struct tcm_vhost_tport *tport;
2139 char *ptr;
2140 u64 wwpn = 0;
2141 int off = 0;
2142
2143 /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
2144 return ERR_PTR(-EINVAL); */
2145
2146 tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL);
2147 if (!tport) {
2148 pr_err("Unable to allocate struct tcm_vhost_tport");
2149 return ERR_PTR(-ENOMEM);
2150 }
2151 tport->tport_wwpn = wwpn;
2152 /*
2153 * Determine the emulated Protocol Identifier and Target Port Name
2154 * based on the incoming configfs directory name.
2155 */
2156 ptr = strstr(name, "naa.");
2157 if (ptr) {
2158 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
2159 goto check_len;
2160 }
2161 ptr = strstr(name, "fc.");
2162 if (ptr) {
2163 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
2164 off = 3; /* Skip over "fc." */
2165 goto check_len;
2166 }
2167 ptr = strstr(name, "iqn.");
2168 if (ptr) {
2169 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
2170 goto check_len;
2171 }
2172
2173 pr_err("Unable to locate prefix for emulated Target Port:"
2174 " %s\n", name);
2175 kfree(tport);
2176 return ERR_PTR(-EINVAL);
2177
2178check_len:
2179 if (strlen(name) >= TCM_VHOST_NAMELEN) {
2180 pr_err("Emulated %s Address: %s, exceeds"
2181 " max: %d\n", name, tcm_vhost_dump_proto_id(tport),
2182 TCM_VHOST_NAMELEN);
2183 kfree(tport);
2184 return ERR_PTR(-EINVAL);
2185 }
2186 snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]);
2187
2188 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
2189 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name);
2190
2191 return &tport->tport_wwn;
2192}
2193
2194static void tcm_vhost_drop_tport(struct se_wwn *wwn)
2195{
2196 struct tcm_vhost_tport *tport = container_of(wwn,
2197 struct tcm_vhost_tport, tport_wwn);
2198
2199 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
2200 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport),
2201 tport->tport_name);
2202
2203 kfree(tport);
2204}
2205
Asias He683bd962013-05-06 16:38:27 +08002206static ssize_t
2207tcm_vhost_wwn_show_attr_version(struct target_fabric_configfs *tf,
2208 char *page)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002209{
2210 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
2211 "on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
2212 utsname()->machine);
2213}
2214
2215TF_WWN_ATTR_RO(tcm_vhost, version);
2216
2217static struct configfs_attribute *tcm_vhost_wwn_attrs[] = {
2218 &tcm_vhost_wwn_version.attr,
2219 NULL,
2220};
2221
2222static struct target_core_fabric_ops tcm_vhost_ops = {
2223 .get_fabric_name = tcm_vhost_get_fabric_name,
2224 .get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident,
2225 .tpg_get_wwn = tcm_vhost_get_fabric_wwn,
2226 .tpg_get_tag = tcm_vhost_get_tag,
2227 .tpg_get_default_depth = tcm_vhost_get_default_depth,
2228 .tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id,
2229 .tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len,
2230 .tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id,
2231 .tpg_check_demo_mode = tcm_vhost_check_true,
2232 .tpg_check_demo_mode_cache = tcm_vhost_check_true,
2233 .tpg_check_demo_mode_write_protect = tcm_vhost_check_false,
2234 .tpg_check_prod_mode_write_protect = tcm_vhost_check_false,
2235 .tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl,
2236 .tpg_release_fabric_acl = tcm_vhost_release_fabric_acl,
2237 .tpg_get_inst_index = tcm_vhost_tpg_get_inst_index,
2238 .release_cmd = tcm_vhost_release_cmd,
Nicholas Bellinger084ed452013-06-06 02:20:41 -07002239 .check_stop_free = vhost_scsi_check_stop_free,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002240 .shutdown_session = tcm_vhost_shutdown_session,
2241 .close_session = tcm_vhost_close_session,
2242 .sess_get_index = tcm_vhost_sess_get_index,
2243 .sess_get_initiator_sid = NULL,
2244 .write_pending = tcm_vhost_write_pending,
2245 .write_pending_status = tcm_vhost_write_pending_status,
2246 .set_default_node_attributes = tcm_vhost_set_default_node_attrs,
2247 .get_task_tag = tcm_vhost_get_task_tag,
2248 .get_cmd_state = tcm_vhost_get_cmd_state,
2249 .queue_data_in = tcm_vhost_queue_data_in,
2250 .queue_status = tcm_vhost_queue_status,
2251 .queue_tm_rsp = tcm_vhost_queue_tm_rsp,
Nicholas Bellinger131e6ab2014-03-22 14:55:56 -07002252 .aborted_task = tcm_vhost_aborted_task,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002253 /*
2254 * Setup callers for generic logic in target_core_fabric_configfs.c
2255 */
2256 .fabric_make_wwn = tcm_vhost_make_tport,
2257 .fabric_drop_wwn = tcm_vhost_drop_tport,
2258 .fabric_make_tpg = tcm_vhost_make_tpg,
2259 .fabric_drop_tpg = tcm_vhost_drop_tpg,
2260 .fabric_post_link = tcm_vhost_port_link,
2261 .fabric_pre_unlink = tcm_vhost_port_unlink,
2262 .fabric_make_np = NULL,
2263 .fabric_drop_np = NULL,
2264 .fabric_make_nodeacl = tcm_vhost_make_nodeacl,
2265 .fabric_drop_nodeacl = tcm_vhost_drop_nodeacl,
2266};
2267
2268static int tcm_vhost_register_configfs(void)
2269{
2270 struct target_fabric_configfs *fabric;
2271 int ret;
2272
2273 pr_debug("TCM_VHOST fabric module %s on %s/%s"
2274 " on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
2275 utsname()->machine);
2276 /*
2277 * Register the top level struct config_item_type with TCM core
2278 */
2279 fabric = target_fabric_configfs_init(THIS_MODULE, "vhost");
2280 if (IS_ERR(fabric)) {
2281 pr_err("target_fabric_configfs_init() failed\n");
2282 return PTR_ERR(fabric);
2283 }
2284 /*
2285 * Setup fabric->tf_ops from our local tcm_vhost_ops
2286 */
2287 fabric->tf_ops = tcm_vhost_ops;
2288 /*
2289 * Setup default attribute lists for various fabric->tf_cit_tmpl
2290 */
Andy Groverd80e224d2013-10-09 11:05:56 -07002291 fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs;
2292 fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs;
2293 fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
2294 fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
2295 fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
2296 fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL;
2297 fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
2298 fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
2299 fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002300 /*
2301 * Register the fabric for use within TCM
2302 */
2303 ret = target_fabric_configfs_register(fabric);
2304 if (ret < 0) {
2305 pr_err("target_fabric_configfs_register() failed"
2306 " for TCM_VHOST\n");
2307 return ret;
2308 }
2309 /*
2310 * Setup our local pointer to *fabric
2311 */
2312 tcm_vhost_fabric_configfs = fabric;
2313 pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n");
2314 return 0;
2315};
2316
2317static void tcm_vhost_deregister_configfs(void)
2318{
2319 if (!tcm_vhost_fabric_configfs)
2320 return;
2321
2322 target_fabric_configfs_deregister(tcm_vhost_fabric_configfs);
2323 tcm_vhost_fabric_configfs = NULL;
2324 pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n");
2325};
2326
2327static int __init tcm_vhost_init(void)
2328{
2329 int ret = -ENOMEM;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002330 /*
2331 * Use our own dedicated workqueue for submitting I/O into
2332 * target core to avoid contention within system_wq.
2333 */
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002334 tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0);
2335 if (!tcm_vhost_workqueue)
2336 goto out;
2337
2338 ret = vhost_scsi_register();
2339 if (ret < 0)
2340 goto out_destroy_workqueue;
2341
2342 ret = tcm_vhost_register_configfs();
2343 if (ret < 0)
2344 goto out_vhost_scsi_deregister;
2345
2346 return 0;
2347
2348out_vhost_scsi_deregister:
2349 vhost_scsi_deregister();
2350out_destroy_workqueue:
2351 destroy_workqueue(tcm_vhost_workqueue);
2352out:
2353 return ret;
2354};
2355
2356static void tcm_vhost_exit(void)
2357{
2358 tcm_vhost_deregister_configfs();
2359 vhost_scsi_deregister();
2360 destroy_workqueue(tcm_vhost_workqueue);
2361};
2362
Michael S. Tsirkin181c04a2013-05-02 03:52:59 +03002363MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2364MODULE_ALIAS("tcm_vhost");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002365MODULE_LICENSE("GPL");
2366module_init(tcm_vhost_init);
2367module_exit(tcm_vhost_exit);