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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>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070041#include <target/target_core_base.h>
42#include <target/target_core_fabric.h>
43#include <target/target_core_fabric_configfs.h>
44#include <target/target_core_configfs.h>
45#include <target/configfs_macros.h>
46#include <linux/vhost.h>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070047#include <linux/virtio_scsi.h>
Asias He9d6064a2013-01-06 14:36:13 +080048#include <linux/llist.h>
Asias He1b7f3902013-02-06 13:20:59 +080049#include <linux/bitmap.h>
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -070050#include <linux/percpu_ida.h>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070051
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070052#include "vhost.h"
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030053
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -080054#define VHOST_SCSI_VERSION "v0.1"
55#define VHOST_SCSI_NAMELEN 256
56#define VHOST_SCSI_MAX_CDB_SIZE 32
57#define VHOST_SCSI_DEFAULT_TAGS 256
58#define VHOST_SCSI_PREALLOC_SGLS 2048
59#define VHOST_SCSI_PREALLOC_UPAGES 2048
60#define VHOST_SCSI_PREALLOC_PROT_SGLS 512
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030061
62struct vhost_scsi_inflight {
63 /* Wait for the flush operation to finish */
64 struct completion comp;
65 /* Refcount for the inflight reqs */
66 struct kref kref;
67};
68
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -080069struct vhost_scsi_cmd {
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030070 /* Descriptor from vhost_get_vq_desc() for virt_queue segment */
71 int tvc_vq_desc;
72 /* virtio-scsi initiator task attribute */
73 int tvc_task_attr;
Nicholas Bellinger79c14142015-01-27 13:13:12 -080074 /* virtio-scsi response incoming iovecs */
75 int tvc_in_iovs;
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030076 /* virtio-scsi initiator data direction */
77 enum dma_data_direction tvc_data_direction;
78 /* Expected data transfer length from virtio-scsi header */
79 u32 tvc_exp_data_len;
80 /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
81 u64 tvc_tag;
82 /* The number of scatterlists associated with this cmd */
83 u32 tvc_sgl_count;
Nicholas Bellingere31885d2014-02-22 18:34:43 -080084 u32 tvc_prot_sgl_count;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -080085 /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030086 u32 tvc_lun;
87 /* Pointer to the SGL formatted memory from virtio-scsi */
88 struct scatterlist *tvc_sgl;
Nicholas Bellingerb1935f62014-02-22 18:08:24 -080089 struct scatterlist *tvc_prot_sgl;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -070090 struct page **tvc_upages;
Nicholas Bellinger79c14142015-01-27 13:13:12 -080091 /* Pointer to response header iovec */
92 struct iovec *tvc_resp_iov;
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030093 /* Pointer to vhost_scsi for our device */
94 struct vhost_scsi *tvc_vhost;
95 /* Pointer to vhost_virtqueue for the cmd */
96 struct vhost_virtqueue *tvc_vq;
97 /* Pointer to vhost nexus memory */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -080098 struct vhost_scsi_nexus *tvc_nexus;
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030099 /* The TCM I/O descriptor that is accessed via container_of() */
100 struct se_cmd tvc_se_cmd;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800101 /* work item used for cmwq dispatch to vhost_scsi_submission_work() */
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300102 struct work_struct work;
103 /* Copy of the incoming SCSI command descriptor block (CDB) */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800104 unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE];
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300105 /* Sense buffer that will be mapped into outgoing status */
106 unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
107 /* Completed commands list, serviced from vhost worker thread */
108 struct llist_node tvc_completion_list;
109 /* Used to track inflight cmd */
110 struct vhost_scsi_inflight *inflight;
111};
112
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800113struct vhost_scsi_nexus {
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300114 /* Pointer to TCM session for I_T Nexus */
115 struct se_session *tvn_se_sess;
116};
117
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800118struct vhost_scsi_nacl {
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300119 /* Binary World Wide unique Port Name for Vhost Initiator port */
120 u64 iport_wwpn;
121 /* ASCII formatted WWPN for Sas Initiator port */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800122 char iport_name[VHOST_SCSI_NAMELEN];
123 /* Returned by vhost_scsi_make_nodeacl() */
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300124 struct se_node_acl se_node_acl;
125};
126
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800127struct vhost_scsi_tpg {
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300128 /* Vhost port target portal group tag for TCM */
129 u16 tport_tpgt;
130 /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
131 int tv_tpg_port_count;
132 /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
133 int tv_tpg_vhost_count;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800134 /* list for vhost_scsi_list */
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300135 struct list_head tv_tpg_list;
136 /* Used to protect access for tpg_nexus */
137 struct mutex tv_tpg_mutex;
138 /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800139 struct vhost_scsi_nexus *tpg_nexus;
140 /* Pointer back to vhost_scsi_tport */
141 struct vhost_scsi_tport *tport;
142 /* Returned by vhost_scsi_make_tpg() */
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300143 struct se_portal_group se_tpg;
144 /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */
145 struct vhost_scsi *vhost_scsi;
146};
147
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800148struct vhost_scsi_tport {
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300149 /* SCSI protocol the tport is providing */
150 u8 tport_proto_id;
151 /* Binary World Wide unique Port Name for Vhost Target port */
152 u64 tport_wwpn;
153 /* ASCII formatted WWPN for Vhost Target port */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800154 char tport_name[VHOST_SCSI_NAMELEN];
155 /* Returned by vhost_scsi_make_tport() */
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300156 struct se_wwn tport_wwn;
157};
158
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800159struct vhost_scsi_evt {
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300160 /* event to be sent to guest */
161 struct virtio_scsi_event event;
162 /* event list, serviced from vhost worker thread */
163 struct llist_node list;
164};
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700165
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700166enum {
167 VHOST_SCSI_VQ_CTL = 0,
168 VHOST_SCSI_VQ_EVT = 1,
169 VHOST_SCSI_VQ_IO = 2,
170};
171
Michael S. Tsirkine72fd722014-11-23 18:01:34 +0200172/* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */
Nicholas Bellinger5dade712013-03-27 17:23:41 -0700173enum {
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800174 VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
Nicholas Bellinger664ed902015-01-28 01:31:52 -0800175 (1ULL << VIRTIO_SCSI_F_T10_PI) |
176 (1ULL << VIRTIO_F_ANY_LAYOUT) |
177 (1ULL << VIRTIO_F_VERSION_1)
Nicholas Bellinger5dade712013-03-27 17:23:41 -0700178};
179
Asias He1b7f3902013-02-06 13:20:59 +0800180#define VHOST_SCSI_MAX_TARGET 256
181#define VHOST_SCSI_MAX_VQ 128
Asias Hea6c9af82013-04-25 15:35:21 +0800182#define VHOST_SCSI_MAX_EVENT 128
Asias He67e18cf2013-02-05 12:31:57 +0800183
Asias He3ab2e422013-04-27 11:16:48 +0800184struct vhost_scsi_virtqueue {
185 struct vhost_virtqueue vq;
Michael S. Tsirkin3dfbff32013-04-28 15:38:52 +0300186 /*
187 * Reference counting for inflight reqs, used for flush operation. At
188 * each time, one reference tracks new commands submitted, while we
189 * wait for another one to reach 0.
190 */
Asias Hef2f0173d2013-04-27 11:16:49 +0800191 struct vhost_scsi_inflight inflights[2];
Michael S. Tsirkin3dfbff32013-04-28 15:38:52 +0300192 /*
193 * Indicate current inflight in use, protected by vq->mutex.
194 * Writers must also take dev mutex and flush under it.
195 */
Asias Hef2f0173d2013-04-27 11:16:49 +0800196 int inflight_idx;
Asias He3ab2e422013-04-27 11:16:48 +0800197};
198
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700199struct vhost_scsi {
Asias He67e18cf2013-02-05 12:31:57 +0800200 /* Protected by vhost_scsi->dev.mutex */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800201 struct vhost_scsi_tpg **vs_tpg;
Asias He67e18cf2013-02-05 12:31:57 +0800202 char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
Asias He67e18cf2013-02-05 12:31:57 +0800203
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700204 struct vhost_dev dev;
Asias He3ab2e422013-04-27 11:16:48 +0800205 struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ];
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700206
207 struct vhost_work vs_completion_work; /* cmd completion work item */
Asias He9d6064a2013-01-06 14:36:13 +0800208 struct llist_head vs_completion_list; /* cmd completion queue */
Asias Hea6c9af82013-04-25 15:35:21 +0800209
210 struct vhost_work vs_event_work; /* evt injection work item */
211 struct llist_head vs_event_list; /* evt injection queue */
212
213 bool vs_events_missed; /* any missed events, protected by vq->mutex */
214 int vs_events_nr; /* num of pending events, protected by vq->mutex */
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700215};
216
217/* Local pointer to allocated TCM configfs fabric module */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800218static struct target_fabric_configfs *vhost_scsi_fabric_configfs;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700219
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800220static struct workqueue_struct *vhost_scsi_workqueue;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700221
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800222/* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */
223static DEFINE_MUTEX(vhost_scsi_mutex);
224static LIST_HEAD(vhost_scsi_list);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700225
Nicholas Bellingerb4078b52015-01-28 13:10:51 -0800226static int iov_num_pages(void __user *iov_base, size_t iov_len)
Asias He765b34f2013-01-22 11:20:25 +0800227{
Nicholas Bellingerb4078b52015-01-28 13:10:51 -0800228 return (PAGE_ALIGN((unsigned long)iov_base + iov_len) -
229 ((unsigned long)iov_base & PAGE_MASK)) >> PAGE_SHIFT;
Asias He765b34f2013-01-22 11:20:25 +0800230}
231
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800232static void vhost_scsi_done_inflight(struct kref *kref)
Asias Hef2f0173d2013-04-27 11:16:49 +0800233{
234 struct vhost_scsi_inflight *inflight;
235
236 inflight = container_of(kref, struct vhost_scsi_inflight, kref);
237 complete(&inflight->comp);
238}
239
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800240static void vhost_scsi_init_inflight(struct vhost_scsi *vs,
Asias Hef2f0173d2013-04-27 11:16:49 +0800241 struct vhost_scsi_inflight *old_inflight[])
242{
243 struct vhost_scsi_inflight *new_inflight;
244 struct vhost_virtqueue *vq;
245 int idx, i;
246
247 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
248 vq = &vs->vqs[i].vq;
249
250 mutex_lock(&vq->mutex);
251
252 /* store old infight */
253 idx = vs->vqs[i].inflight_idx;
254 if (old_inflight)
255 old_inflight[i] = &vs->vqs[i].inflights[idx];
256
257 /* setup new infight */
258 vs->vqs[i].inflight_idx = idx ^ 1;
259 new_inflight = &vs->vqs[i].inflights[idx ^ 1];
260 kref_init(&new_inflight->kref);
261 init_completion(&new_inflight->comp);
262
263 mutex_unlock(&vq->mutex);
264 }
265}
266
267static struct vhost_scsi_inflight *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800268vhost_scsi_get_inflight(struct vhost_virtqueue *vq)
Asias Hef2f0173d2013-04-27 11:16:49 +0800269{
270 struct vhost_scsi_inflight *inflight;
271 struct vhost_scsi_virtqueue *svq;
272
273 svq = container_of(vq, struct vhost_scsi_virtqueue, vq);
274 inflight = &svq->inflights[svq->inflight_idx];
275 kref_get(&inflight->kref);
276
277 return inflight;
278}
279
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800280static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight)
Asias Hef2f0173d2013-04-27 11:16:49 +0800281{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800282 kref_put(&inflight->kref, vhost_scsi_done_inflight);
Asias Hef2f0173d2013-04-27 11:16:49 +0800283}
284
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800285static int vhost_scsi_check_true(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700286{
287 return 1;
288}
289
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800290static int vhost_scsi_check_false(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700291{
292 return 0;
293}
294
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800295static char *vhost_scsi_get_fabric_name(void)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700296{
297 return "vhost";
298}
299
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800300static u8 vhost_scsi_get_fabric_proto_ident(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700301{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800302 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
303 struct vhost_scsi_tpg, se_tpg);
304 struct vhost_scsi_tport *tport = tpg->tport;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700305
306 switch (tport->tport_proto_id) {
307 case SCSI_PROTOCOL_SAS:
308 return sas_get_fabric_proto_ident(se_tpg);
309 case SCSI_PROTOCOL_FCP:
310 return fc_get_fabric_proto_ident(se_tpg);
311 case SCSI_PROTOCOL_ISCSI:
312 return iscsi_get_fabric_proto_ident(se_tpg);
313 default:
314 pr_err("Unknown tport_proto_id: 0x%02x, using"
315 " SAS emulation\n", tport->tport_proto_id);
316 break;
317 }
318
319 return sas_get_fabric_proto_ident(se_tpg);
320}
321
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800322static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700323{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800324 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
325 struct vhost_scsi_tpg, se_tpg);
326 struct vhost_scsi_tport *tport = tpg->tport;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700327
328 return &tport->tport_name[0];
329}
330
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800331static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700332{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800333 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
334 struct vhost_scsi_tpg, se_tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700335 return tpg->tport_tpgt;
336}
337
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800338static u32 vhost_scsi_get_default_depth(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700339{
340 return 1;
341}
342
Asias He683bd962013-05-06 16:38:27 +0800343static u32
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800344vhost_scsi_get_pr_transport_id(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +0800345 struct se_node_acl *se_nacl,
346 struct t10_pr_registration *pr_reg,
347 int *format_code,
348 unsigned char *buf)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700349{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800350 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
351 struct vhost_scsi_tpg, se_tpg);
352 struct vhost_scsi_tport *tport = tpg->tport;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700353
354 switch (tport->tport_proto_id) {
355 case SCSI_PROTOCOL_SAS:
356 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
357 format_code, buf);
358 case SCSI_PROTOCOL_FCP:
359 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
360 format_code, buf);
361 case SCSI_PROTOCOL_ISCSI:
362 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
363 format_code, buf);
364 default:
365 pr_err("Unknown tport_proto_id: 0x%02x, using"
366 " SAS emulation\n", tport->tport_proto_id);
367 break;
368 }
369
370 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
371 format_code, buf);
372}
373
Asias He683bd962013-05-06 16:38:27 +0800374static u32
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800375vhost_scsi_get_pr_transport_id_len(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +0800376 struct se_node_acl *se_nacl,
377 struct t10_pr_registration *pr_reg,
378 int *format_code)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700379{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800380 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
381 struct vhost_scsi_tpg, se_tpg);
382 struct vhost_scsi_tport *tport = tpg->tport;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700383
384 switch (tport->tport_proto_id) {
385 case SCSI_PROTOCOL_SAS:
386 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
387 format_code);
388 case SCSI_PROTOCOL_FCP:
389 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
390 format_code);
391 case SCSI_PROTOCOL_ISCSI:
392 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
393 format_code);
394 default:
395 pr_err("Unknown tport_proto_id: 0x%02x, using"
396 " SAS emulation\n", tport->tport_proto_id);
397 break;
398 }
399
400 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
401 format_code);
402}
403
Asias He683bd962013-05-06 16:38:27 +0800404static char *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800405vhost_scsi_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +0800406 const char *buf,
407 u32 *out_tid_len,
408 char **port_nexus_ptr)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700409{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800410 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
411 struct vhost_scsi_tpg, se_tpg);
412 struct vhost_scsi_tport *tport = tpg->tport;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700413
414 switch (tport->tport_proto_id) {
415 case SCSI_PROTOCOL_SAS:
416 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
417 port_nexus_ptr);
418 case SCSI_PROTOCOL_FCP:
419 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
420 port_nexus_ptr);
421 case SCSI_PROTOCOL_ISCSI:
422 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
423 port_nexus_ptr);
424 default:
425 pr_err("Unknown tport_proto_id: 0x%02x, using"
426 " SAS emulation\n", tport->tport_proto_id);
427 break;
428 }
429
430 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
431 port_nexus_ptr);
432}
433
Asias He683bd962013-05-06 16:38:27 +0800434static struct se_node_acl *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800435vhost_scsi_alloc_fabric_acl(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700436{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800437 struct vhost_scsi_nacl *nacl;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700438
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800439 nacl = kzalloc(sizeof(struct vhost_scsi_nacl), GFP_KERNEL);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700440 if (!nacl) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800441 pr_err("Unable to allocate struct vhost_scsi_nacl\n");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700442 return NULL;
443 }
444
445 return &nacl->se_node_acl;
446}
447
Asias He683bd962013-05-06 16:38:27 +0800448static void
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800449vhost_scsi_release_fabric_acl(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +0800450 struct se_node_acl *se_nacl)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700451{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800452 struct vhost_scsi_nacl *nacl = container_of(se_nacl,
453 struct vhost_scsi_nacl, se_node_acl);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700454 kfree(nacl);
455}
456
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800457static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700458{
459 return 1;
460}
461
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800462static void vhost_scsi_release_cmd(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700463{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800464 struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd,
465 struct vhost_scsi_cmd, tvc_se_cmd);
Nicholas Bellingerde1419e2015-01-29 17:21:13 -0800466 struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess;
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800467 int i;
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700468
469 if (tv_cmd->tvc_sgl_count) {
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700470 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
471 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
Michael S. Tsirkind3d665a2013-09-17 22:54:31 +0300472 }
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800473 if (tv_cmd->tvc_prot_sgl_count) {
474 for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++)
475 put_page(sg_page(&tv_cmd->tvc_prot_sgl[i]));
476 }
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700477
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800478 vhost_scsi_put_inflight(tv_cmd->inflight);
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700479 percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700480}
481
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800482static int vhost_scsi_shutdown_session(struct se_session *se_sess)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700483{
484 return 0;
485}
486
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800487static void vhost_scsi_close_session(struct se_session *se_sess)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700488{
489 return;
490}
491
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800492static u32 vhost_scsi_sess_get_index(struct se_session *se_sess)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700493{
494 return 0;
495}
496
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800497static int vhost_scsi_write_pending(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700498{
499 /* Go ahead and process the write immediately */
500 target_execute_cmd(se_cmd);
501 return 0;
502}
503
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800504static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700505{
506 return 0;
507}
508
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800509static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700510{
511 return;
512}
513
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800514static u32 vhost_scsi_get_task_tag(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700515{
516 return 0;
517}
518
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800519static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700520{
521 return 0;
522}
523
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800524static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd)
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700525{
Asias He3c63f662013-05-06 16:38:29 +0800526 struct vhost_scsi *vs = cmd->tvc_vhost;
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700527
Asias He3c63f662013-05-06 16:38:29 +0800528 llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700529
530 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
531}
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700532
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800533static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700534{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800535 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
536 struct vhost_scsi_cmd, tvc_se_cmd);
Asias He3c63f662013-05-06 16:38:29 +0800537 vhost_scsi_complete_cmd(cmd);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700538 return 0;
539}
540
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800541static int vhost_scsi_queue_status(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700542{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800543 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
544 struct vhost_scsi_cmd, tvc_se_cmd);
Asias He3c63f662013-05-06 16:38:29 +0800545 vhost_scsi_complete_cmd(cmd);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700546 return 0;
547}
548
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800549static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700550{
Joern Engelb79fafa2013-07-03 11:22:17 -0400551 return;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700552}
553
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800554static void vhost_scsi_aborted_task(struct se_cmd *se_cmd)
Nicholas Bellinger131e6ab2014-03-22 14:55:56 -0700555{
556 return;
557}
558
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800559static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
Asias Hea6c9af82013-04-25 15:35:21 +0800560{
561 vs->vs_events_nr--;
562 kfree(evt);
563}
564
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800565static struct vhost_scsi_evt *
566vhost_scsi_allocate_evt(struct vhost_scsi *vs,
Asias He683bd962013-05-06 16:38:27 +0800567 u32 event, u32 reason)
Asias Hea6c9af82013-04-25 15:35:21 +0800568{
Asias He3ab2e422013-04-27 11:16:48 +0800569 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800570 struct vhost_scsi_evt *evt;
Asias Hea6c9af82013-04-25 15:35:21 +0800571
572 if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
573 vs->vs_events_missed = true;
574 return NULL;
575 }
576
577 evt = kzalloc(sizeof(*evt), GFP_KERNEL);
578 if (!evt) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800579 vq_err(vq, "Failed to allocate vhost_scsi_evt\n");
Asias Hea6c9af82013-04-25 15:35:21 +0800580 vs->vs_events_missed = true;
581 return NULL;
582 }
583
Michael S. Tsirkine72fd722014-11-23 18:01:34 +0200584 evt->event.event = cpu_to_vhost32(vq, event);
585 evt->event.reason = cpu_to_vhost32(vq, reason);
Asias Hea6c9af82013-04-25 15:35:21 +0800586 vs->vs_events_nr++;
587
588 return evt;
589}
590
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800591static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700592{
Asias He3c63f662013-05-06 16:38:29 +0800593 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700594
595 /* TODO locking against target/backend threads? */
Nicholas Bellinger6c131d02013-06-06 01:44:48 -0700596 transport_generic_free_cmd(se_cmd, 0);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700597
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700598}
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700599
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700600static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
601{
602 return target_put_sess_cmd(se_cmd->se_sess, se_cmd);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700603}
604
Asias He683bd962013-05-06 16:38:27 +0800605static void
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800606vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
Asias Hea6c9af82013-04-25 15:35:21 +0800607{
Asias He3ab2e422013-04-27 11:16:48 +0800608 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +0800609 struct virtio_scsi_event *event = &evt->event;
610 struct virtio_scsi_event __user *eventp;
611 unsigned out, in;
612 int head, ret;
613
614 if (!vq->private_data) {
615 vs->vs_events_missed = true;
616 return;
617 }
618
619again:
620 vhost_disable_notify(&vs->dev, vq);
Michael S. Tsirkin47283be2014-06-05 15:20:27 +0300621 head = vhost_get_vq_desc(vq, vq->iov,
Asias Hea6c9af82013-04-25 15:35:21 +0800622 ARRAY_SIZE(vq->iov), &out, &in,
623 NULL, NULL);
624 if (head < 0) {
625 vs->vs_events_missed = true;
626 return;
627 }
628 if (head == vq->num) {
629 if (vhost_enable_notify(&vs->dev, vq))
630 goto again;
631 vs->vs_events_missed = true;
632 return;
633 }
634
635 if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
636 vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
637 vq->iov[out].iov_len);
638 vs->vs_events_missed = true;
639 return;
640 }
641
642 if (vs->vs_events_missed) {
Michael S. Tsirkine72fd722014-11-23 18:01:34 +0200643 event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED);
Asias Hea6c9af82013-04-25 15:35:21 +0800644 vs->vs_events_missed = false;
645 }
646
647 eventp = vq->iov[out].iov_base;
648 ret = __copy_to_user(eventp, event, sizeof(*event));
649 if (!ret)
650 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
651 else
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800652 vq_err(vq, "Faulted on vhost_scsi_send_event\n");
Asias Hea6c9af82013-04-25 15:35:21 +0800653}
654
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800655static void vhost_scsi_evt_work(struct vhost_work *work)
Asias Hea6c9af82013-04-25 15:35:21 +0800656{
657 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
658 vs_event_work);
Asias He3ab2e422013-04-27 11:16:48 +0800659 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800660 struct vhost_scsi_evt *evt;
Asias Hea6c9af82013-04-25 15:35:21 +0800661 struct llist_node *llnode;
662
663 mutex_lock(&vq->mutex);
664 llnode = llist_del_all(&vs->vs_event_list);
665 while (llnode) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800666 evt = llist_entry(llnode, struct vhost_scsi_evt, list);
Asias Hea6c9af82013-04-25 15:35:21 +0800667 llnode = llist_next(llnode);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800668 vhost_scsi_do_evt_work(vs, evt);
669 vhost_scsi_free_evt(vs, evt);
Asias Hea6c9af82013-04-25 15:35:21 +0800670 }
671 mutex_unlock(&vq->mutex);
672}
673
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700674/* Fill in status and signal that we are done processing this command
675 *
676 * This is scheduled in the vhost work queue so we are called with the owner
677 * process mm and can access the vring.
678 */
679static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
680{
681 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
682 vs_completion_work);
Asias He1b7f3902013-02-06 13:20:59 +0800683 DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
Asias He9d6064a2013-01-06 14:36:13 +0800684 struct virtio_scsi_cmd_resp v_rsp;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800685 struct vhost_scsi_cmd *cmd;
Asias He9d6064a2013-01-06 14:36:13 +0800686 struct llist_node *llnode;
687 struct se_cmd *se_cmd;
Nicholas Bellinger79c14142015-01-27 13:13:12 -0800688 struct iov_iter iov_iter;
Asias He1b7f3902013-02-06 13:20:59 +0800689 int ret, vq;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700690
Asias He1b7f3902013-02-06 13:20:59 +0800691 bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
Asias He9d6064a2013-01-06 14:36:13 +0800692 llnode = llist_del_all(&vs->vs_completion_list);
693 while (llnode) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800694 cmd = llist_entry(llnode, struct vhost_scsi_cmd,
Asias He9d6064a2013-01-06 14:36:13 +0800695 tvc_completion_list);
696 llnode = llist_next(llnode);
Asias He3c63f662013-05-06 16:38:29 +0800697 se_cmd = &cmd->tvc_se_cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700698
699 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
Asias He3c63f662013-05-06 16:38:29 +0800700 cmd, se_cmd->residual_count, se_cmd->scsi_status);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700701
702 memset(&v_rsp, 0, sizeof(v_rsp));
Michael S. Tsirkine72fd722014-11-23 18:01:34 +0200703 v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700704 /* TODO is status_qualifier field needed? */
705 v_rsp.status = se_cmd->scsi_status;
Michael S. Tsirkine72fd722014-11-23 18:01:34 +0200706 v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq,
707 se_cmd->scsi_sense_length);
Asias He3c63f662013-05-06 16:38:29 +0800708 memcpy(v_rsp.sense, cmd->tvc_sense_buf,
Michael S. Tsirkine72fd722014-11-23 18:01:34 +0200709 se_cmd->scsi_sense_length);
Nicholas Bellinger79c14142015-01-27 13:13:12 -0800710
711 iov_iter_init(&iov_iter, READ, cmd->tvc_resp_iov,
712 cmd->tvc_in_iovs, sizeof(v_rsp));
713 ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter);
714 if (likely(ret == sizeof(v_rsp))) {
Asias He3ab2e422013-04-27 11:16:48 +0800715 struct vhost_scsi_virtqueue *q;
Asias He3c63f662013-05-06 16:38:29 +0800716 vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
717 q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
Asias He3ab2e422013-04-27 11:16:48 +0800718 vq = q - vs->vqs;
Asias He1b7f3902013-02-06 13:20:59 +0800719 __set_bit(vq, signal);
720 } else
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700721 pr_err("Faulted on virtio_scsi_cmd_resp\n");
722
Asias He3c63f662013-05-06 16:38:29 +0800723 vhost_scsi_free_cmd(cmd);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700724 }
725
Asias He1b7f3902013-02-06 13:20:59 +0800726 vq = -1;
727 while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
728 < VHOST_SCSI_MAX_VQ)
Asias He3ab2e422013-04-27 11:16:48 +0800729 vhost_signal(&vs->dev, &vs->vqs[vq].vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700730}
731
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800732static struct vhost_scsi_cmd *
733vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg,
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800734 unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
735 u32 exp_data_len, int data_direction)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700736{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800737 struct vhost_scsi_cmd *cmd;
738 struct vhost_scsi_nexus *tv_nexus;
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700739 struct se_session *se_sess;
Nicholas Bellingerb1935f62014-02-22 18:08:24 -0800740 struct scatterlist *sg, *prot_sg;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700741 struct page **pages;
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700742 int tag;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700743
Asias He98718312013-05-06 16:38:28 +0800744 tv_nexus = tpg->tpg_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700745 if (!tv_nexus) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800746 pr_err("Unable to locate active struct vhost_scsi_nexus\n");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700747 return ERR_PTR(-EIO);
748 }
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700749 se_sess = tv_nexus->tvn_se_sess;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700750
Kent Overstreet6f6b5d12014-01-19 08:26:37 +0000751 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING);
Nicholas Bellinger4a47d3a2013-09-23 11:42:28 -0700752 if (tag < 0) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800753 pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
Nicholas Bellinger4a47d3a2013-09-23 11:42:28 -0700754 return ERR_PTR(-ENOMEM);
755 }
756
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800757 cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag];
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700758 sg = cmd->tvc_sgl;
Nicholas Bellingerb1935f62014-02-22 18:08:24 -0800759 prot_sg = cmd->tvc_prot_sgl;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700760 pages = cmd->tvc_upages;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800761 memset(cmd, 0, sizeof(struct vhost_scsi_cmd));
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700762
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700763 cmd->tvc_sgl = sg;
Nicholas Bellingerb1935f62014-02-22 18:08:24 -0800764 cmd->tvc_prot_sgl = prot_sg;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700765 cmd->tvc_upages = pages;
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700766 cmd->tvc_se_cmd.map_tag = tag;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800767 cmd->tvc_tag = scsi_tag;
768 cmd->tvc_lun = lun;
769 cmd->tvc_task_attr = task_attr;
Asias He3c63f662013-05-06 16:38:29 +0800770 cmd->tvc_exp_data_len = exp_data_len;
771 cmd->tvc_data_direction = data_direction;
772 cmd->tvc_nexus = tv_nexus;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800773 cmd->inflight = vhost_scsi_get_inflight(vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700774
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800775 memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800776
Asias He3c63f662013-05-06 16:38:29 +0800777 return cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700778}
779
780/*
781 * Map a user memory range into a scatterlist
782 *
783 * Returns the number of scatterlist entries used or -errno on error.
784 */
Asias He683bd962013-05-06 16:38:27 +0800785static int
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800786vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd,
Nicholas Bellingerb4078b52015-01-28 13:10:51 -0800787 void __user *ptr,
788 size_t len,
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700789 struct scatterlist *sgl,
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800790 bool write)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700791{
Nicholas Bellingerb4078b52015-01-28 13:10:51 -0800792 unsigned int npages = 0, offset, nbytes;
793 unsigned int pages_nr = iov_num_pages(ptr, len);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700794 struct scatterlist *sg = sgl;
Nicholas Bellingerb4078b52015-01-28 13:10:51 -0800795 struct page **pages = cmd->tvc_upages;
Asias He18100532013-01-22 11:20:27 +0800796 int ret, i;
797
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800798 if (pages_nr > VHOST_SCSI_PREALLOC_UPAGES) {
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700799 pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800800 " preallocated VHOST_SCSI_PREALLOC_UPAGES: %u\n",
801 pages_nr, VHOST_SCSI_PREALLOC_UPAGES);
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800802 return -ENOBUFS;
803 }
Asias He18100532013-01-22 11:20:27 +0800804
805 ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
806 /* No pages were pinned */
807 if (ret < 0)
808 goto out;
809 /* Less pages pinned than wanted */
810 if (ret != pages_nr) {
811 for (i = 0; i < ret; i++)
812 put_page(pages[i]);
813 ret = -EFAULT;
814 goto out;
815 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700816
817 while (len > 0) {
Asias He18100532013-01-22 11:20:27 +0800818 offset = (uintptr_t)ptr & ~PAGE_MASK;
819 nbytes = min_t(unsigned int, PAGE_SIZE - offset, len);
820 sg_set_page(sg, pages[npages], nbytes, offset);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700821 ptr += nbytes;
822 len -= nbytes;
823 sg++;
824 npages++;
825 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700826
Asias He18100532013-01-22 11:20:27 +0800827out:
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700828 return ret;
829}
830
Asias He683bd962013-05-06 16:38:27 +0800831static int
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800832vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700833{
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800834 int sgl_count = 0;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700835
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800836 if (!iter || !iter->iov) {
837 pr_err("%s: iter->iov is NULL, but expected bytes: %zu"
838 " present\n", __func__, bytes);
839 return -EINVAL;
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800840 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700841
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800842 sgl_count = iov_iter_npages(iter, 0xffff);
843 if (sgl_count > max_sgls) {
844 pr_err("%s: requested sgl_count: %d exceeds pre-allocated"
845 " max_sgls: %d\n", __func__, sgl_count, max_sgls);
846 return -EINVAL;
847 }
848 return sgl_count;
849}
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700850
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800851static int
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800852vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write,
853 struct iov_iter *iter,
854 struct scatterlist *sg, int sg_count)
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800855{
856 size_t off = iter->iov_offset;
857 int i, ret;
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800858
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800859 for (i = 0; i < iter->nr_segs; i++) {
860 void __user *base = iter->iov[i].iov_base + off;
861 size_t len = iter->iov[i].iov_len - off;
862
863 ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700864 if (ret < 0) {
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800865 for (i = 0; i < sg_count; i++) {
866 struct page *page = sg_page(&sg[i]);
867 if (page)
868 put_page(page);
869 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700870 return ret;
871 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700872 sg += ret;
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800873 off = 0;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700874 }
875 return 0;
876}
877
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800878static int
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800879vhost_scsi_mapal(struct vhost_scsi_cmd *cmd,
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800880 size_t prot_bytes, struct iov_iter *prot_iter,
881 size_t data_bytes, struct iov_iter *data_iter)
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800882{
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800883 int sgl_count, ret;
884 bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE);
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800885
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800886 if (prot_bytes) {
887 sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800888 VHOST_SCSI_PREALLOC_PROT_SGLS);
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800889 if (sgl_count < 0)
890 return sgl_count;
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800891
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800892 sg_init_table(cmd->tvc_prot_sgl, sgl_count);
893 cmd->tvc_prot_sgl_count = sgl_count;
894 pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
895 cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count);
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800896
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800897 ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter,
898 cmd->tvc_prot_sgl,
899 cmd->tvc_prot_sgl_count);
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800900 if (ret < 0) {
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800901 cmd->tvc_prot_sgl_count = 0;
902 return ret;
903 }
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800904 }
905 sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800906 VHOST_SCSI_PREALLOC_SGLS);
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800907 if (sgl_count < 0)
908 return sgl_count;
909
910 sg_init_table(cmd->tvc_sgl, sgl_count);
911 cmd->tvc_sgl_count = sgl_count;
912 pr_debug("%s data_sg %p data_sgl_count %u\n", __func__,
913 cmd->tvc_sgl, cmd->tvc_sgl_count);
914
915 ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter,
916 cmd->tvc_sgl, cmd->tvc_sgl_count);
917 if (ret < 0) {
918 cmd->tvc_sgl_count = 0;
919 return ret;
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800920 }
921 return 0;
922}
923
Nicholas Bellinger46243862014-12-21 10:42:08 -0800924static int vhost_scsi_to_tcm_attr(int attr)
925{
926 switch (attr) {
927 case VIRTIO_SCSI_S_SIMPLE:
928 return TCM_SIMPLE_TAG;
929 case VIRTIO_SCSI_S_ORDERED:
930 return TCM_ORDERED_TAG;
931 case VIRTIO_SCSI_S_HEAD:
932 return TCM_HEAD_TAG;
933 case VIRTIO_SCSI_S_ACA:
934 return TCM_ACA_TAG;
935 default:
936 break;
937 }
938 return TCM_SIMPLE_TAG;
939}
940
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800941static void vhost_scsi_submission_work(struct work_struct *work)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700942{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800943 struct vhost_scsi_cmd *cmd =
944 container_of(work, struct vhost_scsi_cmd, work);
945 struct vhost_scsi_nexus *tv_nexus;
Asias He3c63f662013-05-06 16:38:29 +0800946 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800947 struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
948 int rc;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700949
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800950 /* FIXME: BIDI operation */
Asias He3c63f662013-05-06 16:38:29 +0800951 if (cmd->tvc_sgl_count) {
952 sg_ptr = cmd->tvc_sgl;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800953
954 if (cmd->tvc_prot_sgl_count)
955 sg_prot_ptr = cmd->tvc_prot_sgl;
956 else
957 se_cmd->prot_pto = true;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700958 } else {
959 sg_ptr = NULL;
960 }
Asias He3c63f662013-05-06 16:38:29 +0800961 tv_nexus = cmd->tvc_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700962
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700963 rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
Asias He3c63f662013-05-06 16:38:29 +0800964 cmd->tvc_cdb, &cmd->tvc_sense_buf[0],
965 cmd->tvc_lun, cmd->tvc_exp_data_len,
Nicholas Bellinger46243862014-12-21 10:42:08 -0800966 vhost_scsi_to_tcm_attr(cmd->tvc_task_attr),
967 cmd->tvc_data_direction, TARGET_SCF_ACK_KREF,
968 sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr,
969 cmd->tvc_prot_sgl_count);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700970 if (rc < 0) {
971 transport_send_check_condition_and_sense(se_cmd,
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700972 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700973 transport_generic_free_cmd(se_cmd, 0);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700974 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700975}
976
Asias He683bd962013-05-06 16:38:27 +0800977static void
978vhost_scsi_send_bad_target(struct vhost_scsi *vs,
979 struct vhost_virtqueue *vq,
980 int head, unsigned out)
Asias He637ab212013-04-10 15:06:15 +0800981{
982 struct virtio_scsi_cmd_resp __user *resp;
983 struct virtio_scsi_cmd_resp rsp;
984 int ret;
985
986 memset(&rsp, 0, sizeof(rsp));
987 rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
988 resp = vq->iov[out].iov_base;
989 ret = __copy_to_user(resp, &rsp, sizeof(rsp));
990 if (!ret)
991 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
992 else
993 pr_err("Faulted on virtio_scsi_cmd_resp\n");
994}
995
Asias He683bd962013-05-06 16:38:27 +0800996static void
997vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700998{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800999 struct vhost_scsi_tpg **vs_tpg, *tpg;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001000 struct virtio_scsi_cmd_req v_req;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001001 struct virtio_scsi_cmd_req_pi v_req_pi;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001002 struct vhost_scsi_cmd *cmd;
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001003 struct iov_iter out_iter, in_iter, prot_iter, data_iter;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001004 u64 tag;
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001005 u32 exp_data_len, data_direction;
1006 unsigned out, in;
1007 int head, ret, prot_bytes;
1008 size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp);
1009 size_t out_size, in_size;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001010 u16 lun;
1011 u8 *target, *lunp, task_attr;
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001012 bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001013 void *req, *cdb;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001014
Asias Hee7802212013-05-07 14:54:35 +08001015 mutex_lock(&vq->mutex);
Asias He4f7f46d2013-04-03 14:17:37 +08001016 /*
1017 * We can handle the vq only after the endpoint is setup by calling the
1018 * VHOST_SCSI_SET_ENDPOINT ioctl.
Asias He4f7f46d2013-04-03 14:17:37 +08001019 */
Asias Hee7802212013-05-07 14:54:35 +08001020 vs_tpg = vq->private_data;
Asias He4f7f46d2013-04-03 14:17:37 +08001021 if (!vs_tpg)
Asias Hee7802212013-05-07 14:54:35 +08001022 goto out;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001023
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001024 vhost_disable_notify(&vs->dev, vq);
1025
1026 for (;;) {
Michael S. Tsirkin47283be2014-06-05 15:20:27 +03001027 head = vhost_get_vq_desc(vq, vq->iov,
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001028 ARRAY_SIZE(vq->iov), &out, &in,
1029 NULL, NULL);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001030 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001031 head, out, in);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001032 /* On error, stop handling until the next kick. */
1033 if (unlikely(head < 0))
1034 break;
1035 /* Nothing new? Wait for eventfd to tell us they refilled. */
1036 if (head == vq->num) {
1037 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
1038 vhost_disable_notify(&vs->dev, vq);
1039 continue;
1040 }
1041 break;
1042 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001043 /*
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001044 * Check for a sane response buffer so we can report early
1045 * errors back to the guest.
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001046 */
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001047 if (unlikely(vq->iov[out].iov_len < rsp_size)) {
1048 vq_err(vq, "Expecting at least virtio_scsi_cmd_resp"
1049 " size, got %zu bytes\n", vq->iov[out].iov_len);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001050 break;
1051 }
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001052 /*
1053 * Setup pointers and values based upon different virtio-scsi
1054 * request header if T10_PI is enabled in KVM guest.
1055 */
1056 if (t10_pi) {
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001057 req = &v_req_pi;
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001058 req_size = sizeof(v_req_pi);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001059 lunp = &v_req_pi.lun[0];
1060 target = &v_req_pi.lun[1];
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001061 } else {
1062 req = &v_req;
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001063 req_size = sizeof(v_req);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001064 lunp = &v_req.lun[0];
1065 target = &v_req.lun[1];
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001066 }
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001067 /*
1068 * FIXME: Not correct for BIDI operation
1069 */
1070 out_size = iov_length(vq->iov, out);
1071 in_size = iov_length(&vq->iov[out], in);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001072
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001073 /*
1074 * Copy over the virtio-scsi request header, which for a
1075 * ANY_LAYOUT enabled guest may span multiple iovecs, or a
1076 * single iovec may contain both the header + outgoing
1077 * WRITE payloads.
1078 *
1079 * copy_from_iter() will advance out_iter, so that it will
1080 * point at the start of the outgoing WRITE payload, if
1081 * DMA_TO_DEVICE is set.
1082 */
1083 iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001084
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001085 ret = copy_from_iter(req, req_size, &out_iter);
1086 if (unlikely(ret != req_size)) {
1087 vq_err(vq, "Faulted on copy_from_iter\n");
Nicholas Bellingerde1419e2015-01-29 17:21:13 -08001088 vhost_scsi_send_bad_target(vs, vq, head, out);
1089 continue;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001090 }
Venkatesh Srinivas7fe412d2014-02-24 14:13:32 -08001091 /* virtio-scsi spec requires byte 0 of the lun to be 1 */
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001092 if (unlikely(*lunp != 1)) {
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001093 vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp);
Venkatesh Srinivas7fe412d2014-02-24 14:13:32 -08001094 vhost_scsi_send_bad_target(vs, vq, head, out);
1095 continue;
1096 }
1097
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001098 tpg = ACCESS_ONCE(vs_tpg[*target]);
Asias He98718312013-05-06 16:38:28 +08001099 if (unlikely(!tpg)) {
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001100 /* Target does not exist, fail the request */
Asias He637ab212013-04-10 15:06:15 +08001101 vhost_scsi_send_bad_target(vs, vq, head, out);
Asias He67e18cf2013-02-05 12:31:57 +08001102 continue;
1103 }
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001104 /*
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001105 * Determine data_direction by calculating the total outgoing
1106 * iovec sizes + incoming iovec sizes vs. virtio-scsi request +
1107 * response headers respectively.
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001108 *
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001109 * For DMA_TO_DEVICE this is out_iter, which is already pointing
1110 * to the right place.
1111 *
1112 * For DMA_FROM_DEVICE, the iovec will be just past the end
1113 * of the virtio-scsi response header in either the same
1114 * or immediately following iovec.
1115 *
1116 * Any associated T10_PI bytes for the outgoing / incoming
1117 * payloads are included in calculation of exp_data_len here.
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001118 */
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001119 prot_bytes = 0;
1120
1121 if (out_size > req_size) {
1122 data_direction = DMA_TO_DEVICE;
1123 exp_data_len = out_size - req_size;
1124 data_iter = out_iter;
1125 } else if (in_size > rsp_size) {
1126 data_direction = DMA_FROM_DEVICE;
1127 exp_data_len = in_size - rsp_size;
1128
1129 iov_iter_init(&in_iter, READ, &vq->iov[out], in,
1130 rsp_size + exp_data_len);
1131 iov_iter_advance(&in_iter, rsp_size);
1132 data_iter = in_iter;
1133 } else {
1134 data_direction = DMA_NONE;
1135 exp_data_len = 0;
1136 }
1137 /*
1138 * If T10_PI header + payload is present, setup prot_iter values
1139 * and recalculate data_iter for vhost_scsi_mapal() mapping to
1140 * host scatterlists via get_user_pages_fast().
1141 */
1142 if (t10_pi) {
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001143 if (v_req_pi.pi_bytesout) {
1144 if (data_direction != DMA_TO_DEVICE) {
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001145 vq_err(vq, "Received non zero pi_bytesout,"
1146 " but wrong data_direction\n");
Nicholas Bellingerde1419e2015-01-29 17:21:13 -08001147 vhost_scsi_send_bad_target(vs, vq, head, out);
1148 continue;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001149 }
Michael S. Tsirkine72fd722014-11-23 18:01:34 +02001150 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001151 } else if (v_req_pi.pi_bytesin) {
1152 if (data_direction != DMA_FROM_DEVICE) {
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001153 vq_err(vq, "Received non zero pi_bytesin,"
1154 " but wrong data_direction\n");
Nicholas Bellingerde1419e2015-01-29 17:21:13 -08001155 vhost_scsi_send_bad_target(vs, vq, head, out);
1156 continue;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001157 }
Michael S. Tsirkine72fd722014-11-23 18:01:34 +02001158 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001159 }
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001160 /*
1161 * Set prot_iter to data_iter, and advance past any
1162 * preceeding prot_bytes that may be present.
1163 *
1164 * Also fix up the exp_data_len to reflect only the
1165 * actual data payload length.
1166 */
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001167 if (prot_bytes) {
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001168 exp_data_len -= prot_bytes;
1169 prot_iter = data_iter;
1170 iov_iter_advance(&data_iter, prot_bytes);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001171 }
Michael S. Tsirkine72fd722014-11-23 18:01:34 +02001172 tag = vhost64_to_cpu(vq, v_req_pi.tag);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001173 task_attr = v_req_pi.task_attr;
1174 cdb = &v_req_pi.cdb[0];
1175 lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
1176 } else {
Michael S. Tsirkine72fd722014-11-23 18:01:34 +02001177 tag = vhost64_to_cpu(vq, v_req.tag);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001178 task_attr = v_req.task_attr;
1179 cdb = &v_req.cdb[0];
1180 lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
1181 }
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001182 /*
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001183 * Check that the received CDB size does not exceeded our
1184 * hardcoded max for vhost-scsi, then get a pre-allocated
1185 * cmd descriptor for the new virtio-scsi tag.
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001186 *
1187 * TODO what if cdb was too small for varlen cdb header?
1188 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001189 if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) {
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001190 vq_err(vq, "Received SCSI CDB with command_size: %d that"
1191 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001192 scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE);
Nicholas Bellingerde1419e2015-01-29 17:21:13 -08001193 vhost_scsi_send_bad_target(vs, vq, head, out);
1194 continue;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001195 }
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001196 cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr,
Nicholas Bellinger9f977ef2014-06-10 01:19:38 -07001197 exp_data_len + prot_bytes,
1198 data_direction);
Asias He3c63f662013-05-06 16:38:29 +08001199 if (IS_ERR(cmd)) {
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -07001200 vq_err(vq, "vhost_scsi_get_tag failed %ld\n",
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001201 PTR_ERR(cmd));
Nicholas Bellingerde1419e2015-01-29 17:21:13 -08001202 vhost_scsi_send_bad_target(vs, vq, head, out);
1203 continue;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001204 }
Asias He3c63f662013-05-06 16:38:29 +08001205 cmd->tvc_vhost = vs;
1206 cmd->tvc_vq = vq;
Nicholas Bellinger79c14142015-01-27 13:13:12 -08001207 cmd->tvc_resp_iov = &vq->iov[out];
1208 cmd->tvc_in_iovs = in;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001209
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001210 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001211 cmd->tvc_cdb[0], cmd->tvc_lun);
1212 pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:"
1213 " %d\n", cmd, exp_data_len, prot_bytes, data_direction);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001214
1215 if (data_direction != DMA_NONE) {
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001216 ret = vhost_scsi_mapal(cmd,
1217 prot_bytes, &prot_iter,
1218 exp_data_len, &data_iter);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001219 if (unlikely(ret)) {
1220 vq_err(vq, "Failed to map iov to sgl\n");
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001221 vhost_scsi_release_cmd(&cmd->tvc_se_cmd);
Nicholas Bellingerde1419e2015-01-29 17:21:13 -08001222 vhost_scsi_send_bad_target(vs, vq, head, out);
1223 continue;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001224 }
1225 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001226 /*
1227 * Save the descriptor from vhost_get_vq_desc() to be used to
1228 * complete the virtio-scsi request in TCM callback context via
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001229 * vhost_scsi_queue_data_in() and vhost_scsi_queue_status()
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001230 */
Asias He3c63f662013-05-06 16:38:29 +08001231 cmd->tvc_vq_desc = head;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001232 /*
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001233 * Dispatch cmd descriptor for cmwq execution in process
1234 * context provided by vhost_scsi_workqueue. This also ensures
1235 * cmd is executed on the same kworker CPU as this vhost
1236 * thread to gain positive L2 cache locality effects.
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001237 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001238 INIT_WORK(&cmd->work, vhost_scsi_submission_work);
1239 queue_work(vhost_scsi_workqueue, &cmd->work);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001240 }
Asias Hee7802212013-05-07 14:54:35 +08001241out:
Asias He7ea206c2013-04-10 15:06:14 +08001242 mutex_unlock(&vq->mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001243}
1244
1245static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
1246{
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001247 pr_debug("%s: The handling func for control queue.\n", __func__);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001248}
1249
Asias He683bd962013-05-06 16:38:27 +08001250static void
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001251vhost_scsi_send_evt(struct vhost_scsi *vs,
1252 struct vhost_scsi_tpg *tpg,
Asias He683bd962013-05-06 16:38:27 +08001253 struct se_lun *lun,
1254 u32 event,
1255 u32 reason)
Asias Hea6c9af82013-04-25 15:35:21 +08001256{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001257 struct vhost_scsi_evt *evt;
Asias Hea6c9af82013-04-25 15:35:21 +08001258
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001259 evt = vhost_scsi_allocate_evt(vs, event, reason);
Asias Hea6c9af82013-04-25 15:35:21 +08001260 if (!evt)
1261 return;
1262
1263 if (tpg && lun) {
1264 /* TODO: share lun setup code with virtio-scsi.ko */
1265 /*
1266 * Note: evt->event is zeroed when we allocate it and
1267 * lun[4-7] need to be zero according to virtio-scsi spec.
1268 */
1269 evt->event.lun[0] = 0x01;
Dan Carpenter59c816c2015-02-05 10:37:33 +03001270 evt->event.lun[1] = tpg->tport_tpgt;
Asias Hea6c9af82013-04-25 15:35:21 +08001271 if (lun->unpacked_lun >= 256)
1272 evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
1273 evt->event.lun[3] = lun->unpacked_lun & 0xFF;
1274 }
1275
1276 llist_add(&evt->list, &vs->vs_event_list);
1277 vhost_work_queue(&vs->dev, &vs->vs_event_work);
1278}
1279
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001280static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
1281{
Asias Hea6c9af82013-04-25 15:35:21 +08001282 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1283 poll.work);
1284 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1285
1286 mutex_lock(&vq->mutex);
1287 if (!vq->private_data)
1288 goto out;
1289
1290 if (vs->vs_events_missed)
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001291 vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
Asias Hea6c9af82013-04-25 15:35:21 +08001292out:
1293 mutex_unlock(&vq->mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001294}
1295
1296static void vhost_scsi_handle_kick(struct vhost_work *work)
1297{
1298 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1299 poll.work);
1300 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1301
Asias He1b7f3902013-02-06 13:20:59 +08001302 vhost_scsi_handle_vq(vs, vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001303}
1304
Asias He4f7f46d2013-04-03 14:17:37 +08001305static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
1306{
Asias He3ab2e422013-04-27 11:16:48 +08001307 vhost_poll_flush(&vs->vqs[index].vq.poll);
Asias He4f7f46d2013-04-03 14:17:37 +08001308}
1309
Michael S. Tsirkin3dfbff32013-04-28 15:38:52 +03001310/* Callers must hold dev mutex */
Asias He4f7f46d2013-04-03 14:17:37 +08001311static void vhost_scsi_flush(struct vhost_scsi *vs)
1312{
Asias Hef2f0173d2013-04-27 11:16:49 +08001313 struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];
Asias He4f7f46d2013-04-03 14:17:37 +08001314 int i;
1315
Asias Hef2f0173d2013-04-27 11:16:49 +08001316 /* Init new inflight and remember the old inflight */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001317 vhost_scsi_init_inflight(vs, old_inflight);
Asias Hef2f0173d2013-04-27 11:16:49 +08001318
1319 /*
1320 * The inflight->kref was initialized to 1. We decrement it here to
1321 * indicate the start of the flush operation so that it will reach 0
1322 * when all the reqs are finished.
1323 */
1324 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001325 kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight);
Asias Hef2f0173d2013-04-27 11:16:49 +08001326
1327 /* Flush both the vhost poll and vhost work */
Asias He4f7f46d2013-04-03 14:17:37 +08001328 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1329 vhost_scsi_flush_vq(vs, i);
1330 vhost_work_flush(&vs->dev, &vs->vs_completion_work);
Asias Hea6c9af82013-04-25 15:35:21 +08001331 vhost_work_flush(&vs->dev, &vs->vs_event_work);
Asias Hef2f0173d2013-04-27 11:16:49 +08001332
1333 /* Wait for all reqs issued before the flush to be finished */
1334 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1335 wait_for_completion(&old_inflight[i]->comp);
Asias He4f7f46d2013-04-03 14:17:37 +08001336}
1337
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001338/*
1339 * Called from vhost_scsi_ioctl() context to walk the list of available
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001340 * vhost_scsi_tpg with an active struct vhost_scsi_nexus
Asias Hef2b7daf2013-04-25 15:35:20 +08001341 *
1342 * The lock nesting rule is:
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001343 * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001344 */
Asias He683bd962013-05-06 16:38:27 +08001345static int
1346vhost_scsi_set_endpoint(struct vhost_scsi *vs,
1347 struct vhost_scsi_target *t)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001348{
Nicholas Bellingerab8edab2014-10-08 06:19:20 +00001349 struct se_portal_group *se_tpg;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001350 struct vhost_scsi_tport *tv_tport;
1351 struct vhost_scsi_tpg *tpg;
1352 struct vhost_scsi_tpg **vs_tpg;
Asias He4f7f46d2013-04-03 14:17:37 +08001353 struct vhost_virtqueue *vq;
1354 int index, ret, i, len;
Asias He67e18cf2013-02-05 12:31:57 +08001355 bool match = false;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001356
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001357 mutex_lock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001358 mutex_lock(&vs->dev.mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001359
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001360 /* Verify that ring has been setup correctly. */
1361 for (index = 0; index < vs->dev.nvqs; ++index) {
1362 /* Verify that ring has been setup correctly. */
Asias He3ab2e422013-04-27 11:16:48 +08001363 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
Asias Hef2b7daf2013-04-25 15:35:20 +08001364 ret = -EFAULT;
1365 goto out;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001366 }
1367 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001368
Asias He4f7f46d2013-04-03 14:17:37 +08001369 len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
1370 vs_tpg = kzalloc(len, GFP_KERNEL);
1371 if (!vs_tpg) {
Asias Hef2b7daf2013-04-25 15:35:20 +08001372 ret = -ENOMEM;
1373 goto out;
Asias He4f7f46d2013-04-03 14:17:37 +08001374 }
1375 if (vs->vs_tpg)
1376 memcpy(vs_tpg, vs->vs_tpg, len);
1377
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001378 list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) {
Asias He98718312013-05-06 16:38:28 +08001379 mutex_lock(&tpg->tv_tpg_mutex);
1380 if (!tpg->tpg_nexus) {
1381 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001382 continue;
1383 }
Asias He98718312013-05-06 16:38:28 +08001384 if (tpg->tv_tpg_vhost_count != 0) {
1385 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001386 continue;
1387 }
Asias He98718312013-05-06 16:38:28 +08001388 tv_tport = tpg->tport;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001389
Asias He67e18cf2013-02-05 12:31:57 +08001390 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
Asias He98718312013-05-06 16:38:28 +08001391 if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
Asias He4f7f46d2013-04-03 14:17:37 +08001392 kfree(vs_tpg);
Asias He98718312013-05-06 16:38:28 +08001393 mutex_unlock(&tpg->tv_tpg_mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001394 ret = -EEXIST;
1395 goto out;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001396 }
Nicholas Bellingerab8edab2014-10-08 06:19:20 +00001397 /*
1398 * In order to ensure individual vhost-scsi configfs
1399 * groups cannot be removed while in use by vhost ioctl,
1400 * go ahead and take an explicit se_tpg->tpg_group.cg_item
1401 * dependency now.
1402 */
1403 se_tpg = &tpg->se_tpg;
1404 ret = configfs_depend_item(se_tpg->se_tpg_tfo->tf_subsys,
1405 &se_tpg->tpg_group.cg_item);
1406 if (ret) {
1407 pr_warn("configfs_depend_item() failed: %d\n", ret);
1408 kfree(vs_tpg);
1409 mutex_unlock(&tpg->tv_tpg_mutex);
1410 goto out;
1411 }
Asias He98718312013-05-06 16:38:28 +08001412 tpg->tv_tpg_vhost_count++;
1413 tpg->vhost_scsi = vs;
1414 vs_tpg[tpg->tport_tpgt] = tpg;
Peter Zijlstra4e857c52014-03-17 18:06:10 +01001415 smp_mb__after_atomic();
Asias He67e18cf2013-02-05 12:31:57 +08001416 match = true;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001417 }
Asias He98718312013-05-06 16:38:28 +08001418 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001419 }
Asias He67e18cf2013-02-05 12:31:57 +08001420
1421 if (match) {
1422 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1423 sizeof(vs->vs_vhost_wwpn));
Asias He4f7f46d2013-04-03 14:17:37 +08001424 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
Asias He3ab2e422013-04-27 11:16:48 +08001425 vq = &vs->vqs[i].vq;
Asias He4f7f46d2013-04-03 14:17:37 +08001426 mutex_lock(&vq->mutex);
Asias He22fa90c2013-05-07 14:54:36 +08001427 vq->private_data = vs_tpg;
Asias Hedfd5d562013-04-03 14:17:38 +08001428 vhost_init_used(vq);
Asias He4f7f46d2013-04-03 14:17:37 +08001429 mutex_unlock(&vq->mutex);
1430 }
Asias He67e18cf2013-02-05 12:31:57 +08001431 ret = 0;
1432 } else {
1433 ret = -EEXIST;
1434 }
1435
Asias He4f7f46d2013-04-03 14:17:37 +08001436 /*
1437 * Act as synchronize_rcu to make sure access to
1438 * old vs->vs_tpg is finished.
1439 */
1440 vhost_scsi_flush(vs);
1441 kfree(vs->vs_tpg);
1442 vs->vs_tpg = vs_tpg;
1443
Asias Hef2b7daf2013-04-25 15:35:20 +08001444out:
Asias He67e18cf2013-02-05 12:31:57 +08001445 mutex_unlock(&vs->dev.mutex);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001446 mutex_unlock(&vhost_scsi_mutex);
Asias He67e18cf2013-02-05 12:31:57 +08001447 return ret;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001448}
1449
Asias He683bd962013-05-06 16:38:27 +08001450static int
1451vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
1452 struct vhost_scsi_target *t)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001453{
Nicholas Bellingerab8edab2014-10-08 06:19:20 +00001454 struct se_portal_group *se_tpg;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001455 struct vhost_scsi_tport *tv_tport;
1456 struct vhost_scsi_tpg *tpg;
Asias He4f7f46d2013-04-03 14:17:37 +08001457 struct vhost_virtqueue *vq;
1458 bool match = false;
Asias He67e18cf2013-02-05 12:31:57 +08001459 int index, ret, i;
1460 u8 target;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001461
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001462 mutex_lock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001463 mutex_lock(&vs->dev.mutex);
1464 /* Verify that ring has been setup correctly. */
1465 for (index = 0; index < vs->dev.nvqs; ++index) {
Asias He3ab2e422013-04-27 11:16:48 +08001466 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001467 ret = -EFAULT;
Asias He038e0af2013-03-15 09:14:05 +08001468 goto err_dev;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001469 }
1470 }
Asias He4f7f46d2013-04-03 14:17:37 +08001471
1472 if (!vs->vs_tpg) {
Asias Hef2b7daf2013-04-25 15:35:20 +08001473 ret = 0;
1474 goto err_dev;
Asias He4f7f46d2013-04-03 14:17:37 +08001475 }
1476
Asias He67e18cf2013-02-05 12:31:57 +08001477 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1478 target = i;
Asias He98718312013-05-06 16:38:28 +08001479 tpg = vs->vs_tpg[target];
1480 if (!tpg)
Asias He67e18cf2013-02-05 12:31:57 +08001481 continue;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001482
Asias He98718312013-05-06 16:38:28 +08001483 mutex_lock(&tpg->tv_tpg_mutex);
1484 tv_tport = tpg->tport;
Asias He67e18cf2013-02-05 12:31:57 +08001485 if (!tv_tport) {
1486 ret = -ENODEV;
Asias He038e0af2013-03-15 09:14:05 +08001487 goto err_tpg;
Asias He67e18cf2013-02-05 12:31:57 +08001488 }
1489
1490 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
Asias He98718312013-05-06 16:38:28 +08001491 pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
Asias He67e18cf2013-02-05 12:31:57 +08001492 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
Asias He98718312013-05-06 16:38:28 +08001493 tv_tport->tport_name, tpg->tport_tpgt,
Asias He67e18cf2013-02-05 12:31:57 +08001494 t->vhost_wwpn, t->vhost_tpgt);
1495 ret = -EINVAL;
Asias He038e0af2013-03-15 09:14:05 +08001496 goto err_tpg;
Asias He67e18cf2013-02-05 12:31:57 +08001497 }
Asias He98718312013-05-06 16:38:28 +08001498 tpg->tv_tpg_vhost_count--;
1499 tpg->vhost_scsi = NULL;
Asias He67e18cf2013-02-05 12:31:57 +08001500 vs->vs_tpg[target] = NULL;
Asias He4f7f46d2013-04-03 14:17:37 +08001501 match = true;
Asias He98718312013-05-06 16:38:28 +08001502 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellingerab8edab2014-10-08 06:19:20 +00001503 /*
1504 * Release se_tpg->tpg_group.cg_item configfs dependency now
1505 * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur.
1506 */
1507 se_tpg = &tpg->se_tpg;
1508 configfs_undepend_item(se_tpg->se_tpg_tfo->tf_subsys,
1509 &se_tpg->tpg_group.cg_item);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001510 }
Asias He4f7f46d2013-04-03 14:17:37 +08001511 if (match) {
1512 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
Asias He3ab2e422013-04-27 11:16:48 +08001513 vq = &vs->vqs[i].vq;
Asias He4f7f46d2013-04-03 14:17:37 +08001514 mutex_lock(&vq->mutex);
Asias He22fa90c2013-05-07 14:54:36 +08001515 vq->private_data = NULL;
Asias He4f7f46d2013-04-03 14:17:37 +08001516 mutex_unlock(&vq->mutex);
1517 }
1518 }
1519 /*
1520 * Act as synchronize_rcu to make sure access to
1521 * old vs->vs_tpg is finished.
1522 */
1523 vhost_scsi_flush(vs);
1524 kfree(vs->vs_tpg);
1525 vs->vs_tpg = NULL;
Asias Hea6c9af82013-04-25 15:35:21 +08001526 WARN_ON(vs->vs_events_nr);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001527 mutex_unlock(&vs->dev.mutex);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001528 mutex_unlock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001529 return 0;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001530
Asias He038e0af2013-03-15 09:14:05 +08001531err_tpg:
Asias He98718312013-05-06 16:38:28 +08001532 mutex_unlock(&tpg->tv_tpg_mutex);
Asias He038e0af2013-03-15 09:14:05 +08001533err_dev:
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001534 mutex_unlock(&vs->dev.mutex);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001535 mutex_unlock(&vhost_scsi_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001536 return ret;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001537}
1538
Asias He4f7f46d2013-04-03 14:17:37 +08001539static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1540{
Michael S. Tsirkinea16c512014-06-05 15:20:23 +03001541 struct vhost_virtqueue *vq;
1542 int i;
1543
Asias He4f7f46d2013-04-03 14:17:37 +08001544 if (features & ~VHOST_SCSI_FEATURES)
1545 return -EOPNOTSUPP;
1546
1547 mutex_lock(&vs->dev.mutex);
1548 if ((features & (1 << VHOST_F_LOG_ALL)) &&
1549 !vhost_log_access_ok(&vs->dev)) {
1550 mutex_unlock(&vs->dev.mutex);
1551 return -EFAULT;
1552 }
Michael S. Tsirkinea16c512014-06-05 15:20:23 +03001553
1554 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1555 vq = &vs->vqs[i].vq;
1556 mutex_lock(&vq->mutex);
1557 vq->acked_features = features;
1558 mutex_unlock(&vq->mutex);
1559 }
Asias He4f7f46d2013-04-03 14:17:37 +08001560 mutex_unlock(&vs->dev.mutex);
1561 return 0;
1562}
1563
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001564static int vhost_scsi_open(struct inode *inode, struct file *f)
1565{
Asias Hec7289312013-05-06 16:38:26 +08001566 struct vhost_scsi *vs;
Asias He3ab2e422013-04-27 11:16:48 +08001567 struct vhost_virtqueue **vqs;
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001568 int r = -ENOMEM, i;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001569
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001570 vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
1571 if (!vs) {
1572 vs = vzalloc(sizeof(*vs));
1573 if (!vs)
1574 goto err_vs;
1575 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001576
Asias He3ab2e422013-04-27 11:16:48 +08001577 vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL);
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001578 if (!vqs)
1579 goto err_vqs;
Asias He3ab2e422013-04-27 11:16:48 +08001580
Asias Hec7289312013-05-06 16:38:26 +08001581 vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001582 vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);
Asias Hea6c9af82013-04-25 15:35:21 +08001583
Asias Hec7289312013-05-06 16:38:26 +08001584 vs->vs_events_nr = 0;
1585 vs->vs_events_missed = false;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001586
Asias Hec7289312013-05-06 16:38:26 +08001587 vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
1588 vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1589 vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1590 vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
Asias He3ab2e422013-04-27 11:16:48 +08001591 for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
Asias Hec7289312013-05-06 16:38:26 +08001592 vqs[i] = &vs->vqs[i].vq;
1593 vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
Asias He3ab2e422013-04-27 11:16:48 +08001594 }
Zhi Yong Wu59566b6e2013-12-07 04:13:03 +08001595 vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ);
Asias Hef2f0173d2013-04-27 11:16:49 +08001596
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001597 vhost_scsi_init_inflight(vs, NULL);
Asias Hef2f0173d2013-04-27 11:16:49 +08001598
Asias Hec7289312013-05-06 16:38:26 +08001599 f->private_data = vs;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001600 return 0;
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001601
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001602err_vqs:
Michael S. Tsirkin68404442014-06-12 19:00:01 +03001603 kvfree(vs);
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001604err_vs:
1605 return r;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001606}
1607
1608static int vhost_scsi_release(struct inode *inode, struct file *f)
1609{
Asias Hec7289312013-05-06 16:38:26 +08001610 struct vhost_scsi *vs = f->private_data;
Asias He67e18cf2013-02-05 12:31:57 +08001611 struct vhost_scsi_target t;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001612
Asias Hec7289312013-05-06 16:38:26 +08001613 mutex_lock(&vs->dev.mutex);
1614 memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
1615 mutex_unlock(&vs->dev.mutex);
1616 vhost_scsi_clear_endpoint(vs, &t);
1617 vhost_dev_stop(&vs->dev);
1618 vhost_dev_cleanup(&vs->dev, false);
Asias Hea6c9af82013-04-25 15:35:21 +08001619 /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
Asias Hec7289312013-05-06 16:38:26 +08001620 vhost_scsi_flush(vs);
1621 kfree(vs->dev.vqs);
Michael S. Tsirkin68404442014-06-12 19:00:01 +03001622 kvfree(vs);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001623 return 0;
1624}
1625
Asias He683bd962013-05-06 16:38:27 +08001626static long
1627vhost_scsi_ioctl(struct file *f,
1628 unsigned int ioctl,
1629 unsigned long arg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001630{
1631 struct vhost_scsi *vs = f->private_data;
1632 struct vhost_scsi_target backend;
1633 void __user *argp = (void __user *)arg;
1634 u64 __user *featurep = argp;
Asias He11c63412013-04-25 15:35:22 +08001635 u32 __user *eventsp = argp;
1636 u32 events_missed;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001637 u64 features;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001638 int r, abi_version = VHOST_SCSI_ABI_VERSION;
Asias He3ab2e422013-04-27 11:16:48 +08001639 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001640
1641 switch (ioctl) {
1642 case VHOST_SCSI_SET_ENDPOINT:
1643 if (copy_from_user(&backend, argp, sizeof backend))
1644 return -EFAULT;
Michael S. Tsirkin6de71452012-08-18 15:44:09 -07001645 if (backend.reserved != 0)
1646 return -EOPNOTSUPP;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001647
1648 return vhost_scsi_set_endpoint(vs, &backend);
1649 case VHOST_SCSI_CLEAR_ENDPOINT:
1650 if (copy_from_user(&backend, argp, sizeof backend))
1651 return -EFAULT;
Michael S. Tsirkin6de71452012-08-18 15:44:09 -07001652 if (backend.reserved != 0)
1653 return -EOPNOTSUPP;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001654
1655 return vhost_scsi_clear_endpoint(vs, &backend);
1656 case VHOST_SCSI_GET_ABI_VERSION:
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001657 if (copy_to_user(argp, &abi_version, sizeof abi_version))
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001658 return -EFAULT;
1659 return 0;
Asias He11c63412013-04-25 15:35:22 +08001660 case VHOST_SCSI_SET_EVENTS_MISSED:
1661 if (get_user(events_missed, eventsp))
1662 return -EFAULT;
1663 mutex_lock(&vq->mutex);
1664 vs->vs_events_missed = events_missed;
1665 mutex_unlock(&vq->mutex);
1666 return 0;
1667 case VHOST_SCSI_GET_EVENTS_MISSED:
1668 mutex_lock(&vq->mutex);
1669 events_missed = vs->vs_events_missed;
1670 mutex_unlock(&vq->mutex);
1671 if (put_user(events_missed, eventsp))
1672 return -EFAULT;
1673 return 0;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001674 case VHOST_GET_FEATURES:
Nicholas Bellinger5dade712013-03-27 17:23:41 -07001675 features = VHOST_SCSI_FEATURES;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001676 if (copy_to_user(featurep, &features, sizeof features))
1677 return -EFAULT;
1678 return 0;
1679 case VHOST_SET_FEATURES:
1680 if (copy_from_user(&features, featurep, sizeof features))
1681 return -EFAULT;
1682 return vhost_scsi_set_features(vs, features);
1683 default:
1684 mutex_lock(&vs->dev.mutex);
Michael S. Tsirkin935cdee2012-12-06 14:03:34 +02001685 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
1686 /* TODO: flush backend after dev ioctl. */
1687 if (r == -ENOIOCTLCMD)
1688 r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001689 mutex_unlock(&vs->dev.mutex);
1690 return r;
1691 }
1692}
1693
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001694#ifdef CONFIG_COMPAT
1695static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
1696 unsigned long arg)
1697{
1698 return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
1699}
1700#endif
1701
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001702static const struct file_operations vhost_scsi_fops = {
1703 .owner = THIS_MODULE,
1704 .release = vhost_scsi_release,
1705 .unlocked_ioctl = vhost_scsi_ioctl,
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001706#ifdef CONFIG_COMPAT
1707 .compat_ioctl = vhost_scsi_compat_ioctl,
1708#endif
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001709 .open = vhost_scsi_open,
1710 .llseek = noop_llseek,
1711};
1712
1713static struct miscdevice vhost_scsi_misc = {
1714 MISC_DYNAMIC_MINOR,
1715 "vhost-scsi",
1716 &vhost_scsi_fops,
1717};
1718
1719static int __init vhost_scsi_register(void)
1720{
1721 return misc_register(&vhost_scsi_misc);
1722}
1723
1724static int vhost_scsi_deregister(void)
1725{
1726 return misc_deregister(&vhost_scsi_misc);
1727}
1728
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001729static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001730{
1731 switch (tport->tport_proto_id) {
1732 case SCSI_PROTOCOL_SAS:
1733 return "SAS";
1734 case SCSI_PROTOCOL_FCP:
1735 return "FCP";
1736 case SCSI_PROTOCOL_ISCSI:
1737 return "iSCSI";
1738 default:
1739 break;
1740 }
1741
1742 return "Unknown";
1743}
1744
Asias He683bd962013-05-06 16:38:27 +08001745static void
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001746vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg,
Asias He683bd962013-05-06 16:38:27 +08001747 struct se_lun *lun, bool plug)
Asias Hea6c9af82013-04-25 15:35:21 +08001748{
1749
1750 struct vhost_scsi *vs = tpg->vhost_scsi;
1751 struct vhost_virtqueue *vq;
1752 u32 reason;
1753
1754 if (!vs)
1755 return;
1756
1757 mutex_lock(&vs->dev.mutex);
Asias Hea6c9af82013-04-25 15:35:21 +08001758
1759 if (plug)
1760 reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
1761 else
1762 reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
1763
Asias He3ab2e422013-04-27 11:16:48 +08001764 vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +08001765 mutex_lock(&vq->mutex);
Michael S. Tsirkinea16c512014-06-05 15:20:23 +03001766 if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG))
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001767 vhost_scsi_send_evt(vs, tpg, lun,
Michael S. Tsirkinea16c512014-06-05 15:20:23 +03001768 VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
Asias Hea6c9af82013-04-25 15:35:21 +08001769 mutex_unlock(&vq->mutex);
1770 mutex_unlock(&vs->dev.mutex);
1771}
1772
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001773static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
Asias Hea6c9af82013-04-25 15:35:21 +08001774{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001775 vhost_scsi_do_plug(tpg, lun, true);
Asias Hea6c9af82013-04-25 15:35:21 +08001776}
1777
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001778static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
Asias Hea6c9af82013-04-25 15:35:21 +08001779{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001780 vhost_scsi_do_plug(tpg, lun, false);
Asias Hea6c9af82013-04-25 15:35:21 +08001781}
1782
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001783static int vhost_scsi_port_link(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +08001784 struct se_lun *lun)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001785{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001786 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1787 struct vhost_scsi_tpg, se_tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001788
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001789 mutex_lock(&vhost_scsi_mutex);
Asias Hea6c9af82013-04-25 15:35:21 +08001790
Asias He98718312013-05-06 16:38:28 +08001791 mutex_lock(&tpg->tv_tpg_mutex);
1792 tpg->tv_tpg_port_count++;
1793 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001794
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001795 vhost_scsi_hotplug(tpg, lun);
Asias Hea6c9af82013-04-25 15:35:21 +08001796
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001797 mutex_unlock(&vhost_scsi_mutex);
Asias Hea6c9af82013-04-25 15:35:21 +08001798
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001799 return 0;
1800}
1801
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001802static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +08001803 struct se_lun *lun)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001804{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001805 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1806 struct vhost_scsi_tpg, se_tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001807
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001808 mutex_lock(&vhost_scsi_mutex);
Asias Hea6c9af82013-04-25 15:35:21 +08001809
Asias He98718312013-05-06 16:38:28 +08001810 mutex_lock(&tpg->tv_tpg_mutex);
1811 tpg->tv_tpg_port_count--;
1812 mutex_unlock(&tpg->tv_tpg_mutex);
Asias Hea6c9af82013-04-25 15:35:21 +08001813
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001814 vhost_scsi_hotunplug(tpg, lun);
Asias Hea6c9af82013-04-25 15:35:21 +08001815
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001816 mutex_unlock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001817}
1818
Asias He683bd962013-05-06 16:38:27 +08001819static struct se_node_acl *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001820vhost_scsi_make_nodeacl(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +08001821 struct config_group *group,
1822 const char *name)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001823{
1824 struct se_node_acl *se_nacl, *se_nacl_new;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001825 struct vhost_scsi_nacl *nacl;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001826 u64 wwpn = 0;
1827 u32 nexus_depth;
1828
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001829 /* vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001830 return ERR_PTR(-EINVAL); */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001831 se_nacl_new = vhost_scsi_alloc_fabric_acl(se_tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001832 if (!se_nacl_new)
1833 return ERR_PTR(-ENOMEM);
1834
1835 nexus_depth = 1;
1836 /*
1837 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1838 * when converting a NodeACL from demo mode -> explict
1839 */
1840 se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1841 name, nexus_depth);
1842 if (IS_ERR(se_nacl)) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001843 vhost_scsi_release_fabric_acl(se_tpg, se_nacl_new);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001844 return se_nacl;
1845 }
1846 /*
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001847 * Locate our struct vhost_scsi_nacl and set the FC Nport WWPN
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001848 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001849 nacl = container_of(se_nacl, struct vhost_scsi_nacl, se_node_acl);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001850 nacl->iport_wwpn = wwpn;
1851
1852 return se_nacl;
1853}
1854
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001855static void vhost_scsi_drop_nodeacl(struct se_node_acl *se_acl)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001856{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001857 struct vhost_scsi_nacl *nacl = container_of(se_acl,
1858 struct vhost_scsi_nacl, se_node_acl);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001859 core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1860 kfree(nacl);
1861}
1862
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001863static void vhost_scsi_free_cmd_map_res(struct vhost_scsi_nexus *nexus,
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001864 struct se_session *se_sess)
1865{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001866 struct vhost_scsi_cmd *tv_cmd;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001867 unsigned int i;
1868
1869 if (!se_sess->sess_cmd_map)
1870 return;
1871
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001872 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1873 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001874
1875 kfree(tv_cmd->tvc_sgl);
Nicholas Bellingerb1935f62014-02-22 18:08:24 -08001876 kfree(tv_cmd->tvc_prot_sgl);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001877 kfree(tv_cmd->tvc_upages);
1878 }
1879}
1880
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001881static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
Asias He683bd962013-05-06 16:38:27 +08001882 const char *name)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001883{
1884 struct se_portal_group *se_tpg;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001885 struct se_session *se_sess;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001886 struct vhost_scsi_nexus *tv_nexus;
1887 struct vhost_scsi_cmd *tv_cmd;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001888 unsigned int i;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001889
Asias He98718312013-05-06 16:38:28 +08001890 mutex_lock(&tpg->tv_tpg_mutex);
1891 if (tpg->tpg_nexus) {
1892 mutex_unlock(&tpg->tv_tpg_mutex);
1893 pr_debug("tpg->tpg_nexus already exists\n");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001894 return -EEXIST;
1895 }
Asias He98718312013-05-06 16:38:28 +08001896 se_tpg = &tpg->se_tpg;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001897
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001898 tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001899 if (!tv_nexus) {
Asias He98718312013-05-06 16:38:28 +08001900 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001901 pr_err("Unable to allocate struct vhost_scsi_nexus\n");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001902 return -ENOMEM;
1903 }
1904 /*
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -07001905 * Initialize the struct se_session pointer and setup tagpool
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001906 * for struct vhost_scsi_cmd descriptors
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001907 */
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -07001908 tv_nexus->tvn_se_sess = transport_init_session_tags(
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001909 VHOST_SCSI_DEFAULT_TAGS,
1910 sizeof(struct vhost_scsi_cmd),
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001911 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001912 if (IS_ERR(tv_nexus->tvn_se_sess)) {
Asias He98718312013-05-06 16:38:28 +08001913 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001914 kfree(tv_nexus);
1915 return -ENOMEM;
1916 }
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001917 se_sess = tv_nexus->tvn_se_sess;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001918 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1919 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001920
1921 tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001922 VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001923 if (!tv_cmd->tvc_sgl) {
1924 mutex_unlock(&tpg->tv_tpg_mutex);
1925 pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
1926 goto out;
1927 }
1928
1929 tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001930 VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001931 if (!tv_cmd->tvc_upages) {
1932 mutex_unlock(&tpg->tv_tpg_mutex);
1933 pr_err("Unable to allocate tv_cmd->tvc_upages\n");
1934 goto out;
1935 }
Nicholas Bellingerb1935f62014-02-22 18:08:24 -08001936
1937 tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001938 VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL);
Nicholas Bellingerb1935f62014-02-22 18:08:24 -08001939 if (!tv_cmd->tvc_prot_sgl) {
1940 mutex_unlock(&tpg->tv_tpg_mutex);
1941 pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
1942 goto out;
1943 }
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001944 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001945 /*
1946 * Since we are running in 'demo mode' this call with generate a
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001947 * struct se_node_acl for the vhost_scsi struct se_portal_group with
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001948 * the SCSI Initiator port name of the passed configfs group 'name'.
1949 */
1950 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1951 se_tpg, (unsigned char *)name);
1952 if (!tv_nexus->tvn_se_sess->se_node_acl) {
Asias He98718312013-05-06 16:38:28 +08001953 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001954 pr_debug("core_tpg_check_initiator_node_acl() failed"
1955 " for %s\n", name);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001956 goto out;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001957 }
1958 /*
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001959 * Now register the TCM vhost virtual I_T Nexus as active with the
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001960 * call to __transport_register_session()
1961 */
1962 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1963 tv_nexus->tvn_se_sess, tv_nexus);
Asias He98718312013-05-06 16:38:28 +08001964 tpg->tpg_nexus = tv_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001965
Asias He98718312013-05-06 16:38:28 +08001966 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001967 return 0;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001968
1969out:
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001970 vhost_scsi_free_cmd_map_res(tv_nexus, se_sess);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001971 transport_free_session(se_sess);
1972 kfree(tv_nexus);
1973 return -ENOMEM;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001974}
1975
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001976static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001977{
1978 struct se_session *se_sess;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001979 struct vhost_scsi_nexus *tv_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001980
1981 mutex_lock(&tpg->tv_tpg_mutex);
1982 tv_nexus = tpg->tpg_nexus;
1983 if (!tv_nexus) {
1984 mutex_unlock(&tpg->tv_tpg_mutex);
1985 return -ENODEV;
1986 }
1987
1988 se_sess = tv_nexus->tvn_se_sess;
1989 if (!se_sess) {
1990 mutex_unlock(&tpg->tv_tpg_mutex);
1991 return -ENODEV;
1992 }
1993
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001994 if (tpg->tv_tpg_port_count != 0) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001995 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001996 pr_err("Unable to remove TCM_vhost I_T Nexus with"
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001997 " active TPG port count: %d\n",
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001998 tpg->tv_tpg_port_count);
1999 return -EBUSY;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002000 }
2001
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002002 if (tpg->tv_tpg_vhost_count != 0) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002003 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002004 pr_err("Unable to remove TCM_vhost I_T Nexus with"
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002005 " active TPG vhost count: %d\n",
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002006 tpg->tv_tpg_vhost_count);
2007 return -EBUSY;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002008 }
2009
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002010 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002011 " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport),
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002012 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07002013
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002014 vhost_scsi_free_cmd_map_res(tv_nexus, se_sess);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002015 /*
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002016 * Release the SCSI I_T Nexus to the emulated vhost Target Port
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002017 */
2018 transport_deregister_session(tv_nexus->tvn_se_sess);
2019 tpg->tpg_nexus = NULL;
2020 mutex_unlock(&tpg->tv_tpg_mutex);
2021
2022 kfree(tv_nexus);
2023 return 0;
2024}
2025
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002026static ssize_t vhost_scsi_tpg_show_nexus(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +08002027 char *page)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002028{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002029 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2030 struct vhost_scsi_tpg, se_tpg);
2031 struct vhost_scsi_nexus *tv_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002032 ssize_t ret;
2033
Asias He98718312013-05-06 16:38:28 +08002034 mutex_lock(&tpg->tv_tpg_mutex);
2035 tv_nexus = tpg->tpg_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002036 if (!tv_nexus) {
Asias He98718312013-05-06 16:38:28 +08002037 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002038 return -ENODEV;
2039 }
2040 ret = snprintf(page, PAGE_SIZE, "%s\n",
2041 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
Asias He98718312013-05-06 16:38:28 +08002042 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002043
2044 return ret;
2045}
2046
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002047static ssize_t vhost_scsi_tpg_store_nexus(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +08002048 const char *page,
2049 size_t count)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002050{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002051 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2052 struct vhost_scsi_tpg, se_tpg);
2053 struct vhost_scsi_tport *tport_wwn = tpg->tport;
2054 unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002055 int ret;
2056 /*
2057 * Shutdown the active I_T nexus if 'NULL' is passed..
2058 */
2059 if (!strncmp(page, "NULL", 4)) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002060 ret = vhost_scsi_drop_nexus(tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002061 return (!ret) ? count : ret;
2062 }
2063 /*
2064 * Otherwise make sure the passed virtual Initiator port WWN matches
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002065 * the fabric protocol_id set in vhost_scsi_make_tport(), and call
2066 * vhost_scsi_make_nexus().
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002067 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002068 if (strlen(page) >= VHOST_SCSI_NAMELEN) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002069 pr_err("Emulated NAA Sas Address: %s, exceeds"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002070 " max: %d\n", page, VHOST_SCSI_NAMELEN);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002071 return -EINVAL;
2072 }
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002073 snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002074
2075 ptr = strstr(i_port, "naa.");
2076 if (ptr) {
2077 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
2078 pr_err("Passed SAS Initiator Port %s does not"
2079 " match target port protoid: %s\n", i_port,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002080 vhost_scsi_dump_proto_id(tport_wwn));
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002081 return -EINVAL;
2082 }
2083 port_ptr = &i_port[0];
2084 goto check_newline;
2085 }
2086 ptr = strstr(i_port, "fc.");
2087 if (ptr) {
2088 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
2089 pr_err("Passed FCP Initiator Port %s does not"
2090 " match target port protoid: %s\n", i_port,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002091 vhost_scsi_dump_proto_id(tport_wwn));
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002092 return -EINVAL;
2093 }
2094 port_ptr = &i_port[3]; /* Skip over "fc." */
2095 goto check_newline;
2096 }
2097 ptr = strstr(i_port, "iqn.");
2098 if (ptr) {
2099 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
2100 pr_err("Passed iSCSI Initiator Port %s does not"
2101 " match target port protoid: %s\n", i_port,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002102 vhost_scsi_dump_proto_id(tport_wwn));
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002103 return -EINVAL;
2104 }
2105 port_ptr = &i_port[0];
2106 goto check_newline;
2107 }
2108 pr_err("Unable to locate prefix for emulated Initiator Port:"
2109 " %s\n", i_port);
2110 return -EINVAL;
2111 /*
2112 * Clear any trailing newline for the NAA WWN
2113 */
2114check_newline:
2115 if (i_port[strlen(i_port)-1] == '\n')
2116 i_port[strlen(i_port)-1] = '\0';
2117
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002118 ret = vhost_scsi_make_nexus(tpg, port_ptr);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002119 if (ret < 0)
2120 return ret;
2121
2122 return count;
2123}
2124
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002125TF_TPG_BASE_ATTR(vhost_scsi, nexus, S_IRUGO | S_IWUSR);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002126
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002127static struct configfs_attribute *vhost_scsi_tpg_attrs[] = {
2128 &vhost_scsi_tpg_nexus.attr,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002129 NULL,
2130};
2131
Asias He683bd962013-05-06 16:38:27 +08002132static struct se_portal_group *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002133vhost_scsi_make_tpg(struct se_wwn *wwn,
Asias He683bd962013-05-06 16:38:27 +08002134 struct config_group *group,
2135 const char *name)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002136{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002137 struct vhost_scsi_tport *tport = container_of(wwn,
2138 struct vhost_scsi_tport, tport_wwn);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002139
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002140 struct vhost_scsi_tpg *tpg;
Dan Carpenter59c816c2015-02-05 10:37:33 +03002141 u16 tpgt;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002142 int ret;
2143
2144 if (strstr(name, "tpgt_") != name)
2145 return ERR_PTR(-EINVAL);
Dan Carpenter59c816c2015-02-05 10:37:33 +03002146 if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002147 return ERR_PTR(-EINVAL);
2148
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002149 tpg = kzalloc(sizeof(struct vhost_scsi_tpg), GFP_KERNEL);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002150 if (!tpg) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002151 pr_err("Unable to allocate struct vhost_scsi_tpg");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002152 return ERR_PTR(-ENOMEM);
2153 }
2154 mutex_init(&tpg->tv_tpg_mutex);
2155 INIT_LIST_HEAD(&tpg->tv_tpg_list);
2156 tpg->tport = tport;
2157 tpg->tport_tpgt = tpgt;
2158
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002159 ret = core_tpg_register(&vhost_scsi_fabric_configfs->tf_ops, wwn,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002160 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
2161 if (ret < 0) {
2162 kfree(tpg);
2163 return NULL;
2164 }
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002165 mutex_lock(&vhost_scsi_mutex);
2166 list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list);
2167 mutex_unlock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002168
2169 return &tpg->se_tpg;
2170}
2171
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002172static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002173{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002174 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2175 struct vhost_scsi_tpg, se_tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002176
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002177 mutex_lock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002178 list_del(&tpg->tv_tpg_list);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002179 mutex_unlock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002180 /*
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002181 * Release the virtual I_T Nexus for this vhost TPG
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002182 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002183 vhost_scsi_drop_nexus(tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002184 /*
2185 * Deregister the se_tpg from TCM..
2186 */
2187 core_tpg_deregister(se_tpg);
2188 kfree(tpg);
2189}
2190
Asias He683bd962013-05-06 16:38:27 +08002191static struct se_wwn *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002192vhost_scsi_make_tport(struct target_fabric_configfs *tf,
Asias He683bd962013-05-06 16:38:27 +08002193 struct config_group *group,
2194 const char *name)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002195{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002196 struct vhost_scsi_tport *tport;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002197 char *ptr;
2198 u64 wwpn = 0;
2199 int off = 0;
2200
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002201 /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002202 return ERR_PTR(-EINVAL); */
2203
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002204 tport = kzalloc(sizeof(struct vhost_scsi_tport), GFP_KERNEL);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002205 if (!tport) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002206 pr_err("Unable to allocate struct vhost_scsi_tport");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002207 return ERR_PTR(-ENOMEM);
2208 }
2209 tport->tport_wwpn = wwpn;
2210 /*
2211 * Determine the emulated Protocol Identifier and Target Port Name
2212 * based on the incoming configfs directory name.
2213 */
2214 ptr = strstr(name, "naa.");
2215 if (ptr) {
2216 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
2217 goto check_len;
2218 }
2219 ptr = strstr(name, "fc.");
2220 if (ptr) {
2221 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
2222 off = 3; /* Skip over "fc." */
2223 goto check_len;
2224 }
2225 ptr = strstr(name, "iqn.");
2226 if (ptr) {
2227 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
2228 goto check_len;
2229 }
2230
2231 pr_err("Unable to locate prefix for emulated Target Port:"
2232 " %s\n", name);
2233 kfree(tport);
2234 return ERR_PTR(-EINVAL);
2235
2236check_len:
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002237 if (strlen(name) >= VHOST_SCSI_NAMELEN) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002238 pr_err("Emulated %s Address: %s, exceeds"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002239 " max: %d\n", name, vhost_scsi_dump_proto_id(tport),
2240 VHOST_SCSI_NAMELEN);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002241 kfree(tport);
2242 return ERR_PTR(-EINVAL);
2243 }
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002244 snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002245
2246 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002247 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002248
2249 return &tport->tport_wwn;
2250}
2251
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002252static void vhost_scsi_drop_tport(struct se_wwn *wwn)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002253{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002254 struct vhost_scsi_tport *tport = container_of(wwn,
2255 struct vhost_scsi_tport, tport_wwn);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002256
2257 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002258 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport),
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002259 tport->tport_name);
2260
2261 kfree(tport);
2262}
2263
Asias He683bd962013-05-06 16:38:27 +08002264static ssize_t
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002265vhost_scsi_wwn_show_attr_version(struct target_fabric_configfs *tf,
Asias He683bd962013-05-06 16:38:27 +08002266 char *page)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002267{
2268 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002269 "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002270 utsname()->machine);
2271}
2272
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002273TF_WWN_ATTR_RO(vhost_scsi, version);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002274
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002275static struct configfs_attribute *vhost_scsi_wwn_attrs[] = {
2276 &vhost_scsi_wwn_version.attr,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002277 NULL,
2278};
2279
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002280static struct target_core_fabric_ops vhost_scsi_ops = {
2281 .get_fabric_name = vhost_scsi_get_fabric_name,
2282 .get_fabric_proto_ident = vhost_scsi_get_fabric_proto_ident,
2283 .tpg_get_wwn = vhost_scsi_get_fabric_wwn,
2284 .tpg_get_tag = vhost_scsi_get_tpgt,
2285 .tpg_get_default_depth = vhost_scsi_get_default_depth,
2286 .tpg_get_pr_transport_id = vhost_scsi_get_pr_transport_id,
2287 .tpg_get_pr_transport_id_len = vhost_scsi_get_pr_transport_id_len,
2288 .tpg_parse_pr_out_transport_id = vhost_scsi_parse_pr_out_transport_id,
2289 .tpg_check_demo_mode = vhost_scsi_check_true,
2290 .tpg_check_demo_mode_cache = vhost_scsi_check_true,
2291 .tpg_check_demo_mode_write_protect = vhost_scsi_check_false,
2292 .tpg_check_prod_mode_write_protect = vhost_scsi_check_false,
2293 .tpg_alloc_fabric_acl = vhost_scsi_alloc_fabric_acl,
2294 .tpg_release_fabric_acl = vhost_scsi_release_fabric_acl,
2295 .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index,
2296 .release_cmd = vhost_scsi_release_cmd,
Nicholas Bellinger084ed452013-06-06 02:20:41 -07002297 .check_stop_free = vhost_scsi_check_stop_free,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002298 .shutdown_session = vhost_scsi_shutdown_session,
2299 .close_session = vhost_scsi_close_session,
2300 .sess_get_index = vhost_scsi_sess_get_index,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002301 .sess_get_initiator_sid = NULL,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002302 .write_pending = vhost_scsi_write_pending,
2303 .write_pending_status = vhost_scsi_write_pending_status,
2304 .set_default_node_attributes = vhost_scsi_set_default_node_attrs,
2305 .get_task_tag = vhost_scsi_get_task_tag,
2306 .get_cmd_state = vhost_scsi_get_cmd_state,
2307 .queue_data_in = vhost_scsi_queue_data_in,
2308 .queue_status = vhost_scsi_queue_status,
2309 .queue_tm_rsp = vhost_scsi_queue_tm_rsp,
2310 .aborted_task = vhost_scsi_aborted_task,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002311 /*
2312 * Setup callers for generic logic in target_core_fabric_configfs.c
2313 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002314 .fabric_make_wwn = vhost_scsi_make_tport,
2315 .fabric_drop_wwn = vhost_scsi_drop_tport,
2316 .fabric_make_tpg = vhost_scsi_make_tpg,
2317 .fabric_drop_tpg = vhost_scsi_drop_tpg,
2318 .fabric_post_link = vhost_scsi_port_link,
2319 .fabric_pre_unlink = vhost_scsi_port_unlink,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002320 .fabric_make_np = NULL,
2321 .fabric_drop_np = NULL,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002322 .fabric_make_nodeacl = vhost_scsi_make_nodeacl,
2323 .fabric_drop_nodeacl = vhost_scsi_drop_nodeacl,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002324};
2325
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002326static int vhost_scsi_register_configfs(void)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002327{
2328 struct target_fabric_configfs *fabric;
2329 int ret;
2330
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002331 pr_debug("vhost-scsi fabric module %s on %s/%s"
2332 " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002333 utsname()->machine);
2334 /*
2335 * Register the top level struct config_item_type with TCM core
2336 */
2337 fabric = target_fabric_configfs_init(THIS_MODULE, "vhost");
2338 if (IS_ERR(fabric)) {
2339 pr_err("target_fabric_configfs_init() failed\n");
2340 return PTR_ERR(fabric);
2341 }
2342 /*
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002343 * Setup fabric->tf_ops from our local vhost_scsi_ops
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002344 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002345 fabric->tf_ops = vhost_scsi_ops;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002346 /*
2347 * Setup default attribute lists for various fabric->tf_cit_tmpl
2348 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002349 fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = vhost_scsi_wwn_attrs;
2350 fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = vhost_scsi_tpg_attrs;
Andy Groverd80e224d2013-10-09 11:05:56 -07002351 fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
2352 fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
2353 fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
2354 fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL;
2355 fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
2356 fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
2357 fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002358 /*
2359 * Register the fabric for use within TCM
2360 */
2361 ret = target_fabric_configfs_register(fabric);
2362 if (ret < 0) {
2363 pr_err("target_fabric_configfs_register() failed"
2364 " for TCM_VHOST\n");
2365 return ret;
2366 }
2367 /*
2368 * Setup our local pointer to *fabric
2369 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002370 vhost_scsi_fabric_configfs = fabric;
2371 pr_debug("TCM_VHOST[0] - Set fabric -> vhost_scsi_fabric_configfs\n");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002372 return 0;
2373};
2374
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002375static void vhost_scsi_deregister_configfs(void)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002376{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002377 if (!vhost_scsi_fabric_configfs)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002378 return;
2379
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002380 target_fabric_configfs_deregister(vhost_scsi_fabric_configfs);
2381 vhost_scsi_fabric_configfs = NULL;
2382 pr_debug("TCM_VHOST[0] - Cleared vhost_scsi_fabric_configfs\n");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002383};
2384
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002385static int __init vhost_scsi_init(void)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002386{
2387 int ret = -ENOMEM;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002388 /*
2389 * Use our own dedicated workqueue for submitting I/O into
2390 * target core to avoid contention within system_wq.
2391 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002392 vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0);
2393 if (!vhost_scsi_workqueue)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002394 goto out;
2395
2396 ret = vhost_scsi_register();
2397 if (ret < 0)
2398 goto out_destroy_workqueue;
2399
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002400 ret = vhost_scsi_register_configfs();
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002401 if (ret < 0)
2402 goto out_vhost_scsi_deregister;
2403
2404 return 0;
2405
2406out_vhost_scsi_deregister:
2407 vhost_scsi_deregister();
2408out_destroy_workqueue:
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002409 destroy_workqueue(vhost_scsi_workqueue);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002410out:
2411 return ret;
2412};
2413
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002414static void vhost_scsi_exit(void)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002415{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002416 vhost_scsi_deregister_configfs();
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002417 vhost_scsi_deregister();
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002418 destroy_workqueue(vhost_scsi_workqueue);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002419};
2420
Michael S. Tsirkin181c04a2013-05-02 03:52:59 +03002421MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2422MODULE_ALIAS("tcm_vhost");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002423MODULE_LICENSE("GPL");
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002424module_init(vhost_scsi_init);
2425module_exit(vhost_scsi_exit);