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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>
David S. Miller5538d292015-05-28 11:35:41 -070038#include <linux/vmalloc.h>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070039#include <linux/miscdevice.h>
40#include <asm/unaligned.h>
Bart Van Asscheba929992015-05-08 10:11:12 +020041#include <scsi/scsi_common.h>
42#include <scsi/scsi_proto.h>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070043#include <target/target_core_base.h>
44#include <target/target_core_fabric.h>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070045#include <linux/vhost.h>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070046#include <linux/virtio_scsi.h>
Asias He9d6064a2013-01-06 14:36:13 +080047#include <linux/llist.h>
Asias He1b7f3902013-02-06 13:20:59 +080048#include <linux/bitmap.h>
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -070049#include <linux/percpu_ida.h>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070050
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070051#include "vhost.h"
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030052
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -080053#define VHOST_SCSI_VERSION "v0.1"
54#define VHOST_SCSI_NAMELEN 256
55#define VHOST_SCSI_MAX_CDB_SIZE 32
56#define VHOST_SCSI_DEFAULT_TAGS 256
57#define VHOST_SCSI_PREALLOC_SGLS 2048
58#define VHOST_SCSI_PREALLOC_UPAGES 2048
59#define VHOST_SCSI_PREALLOC_PROT_SGLS 512
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030060
61struct vhost_scsi_inflight {
62 /* Wait for the flush operation to finish */
63 struct completion comp;
64 /* Refcount for the inflight reqs */
65 struct kref kref;
66};
67
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -080068struct vhost_scsi_cmd {
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030069 /* Descriptor from vhost_get_vq_desc() for virt_queue segment */
70 int tvc_vq_desc;
71 /* virtio-scsi initiator task attribute */
72 int tvc_task_attr;
Nicholas Bellinger79c14142015-01-27 13:13:12 -080073 /* virtio-scsi response incoming iovecs */
74 int tvc_in_iovs;
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030075 /* virtio-scsi initiator data direction */
76 enum dma_data_direction tvc_data_direction;
77 /* Expected data transfer length from virtio-scsi header */
78 u32 tvc_exp_data_len;
79 /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
80 u64 tvc_tag;
81 /* The number of scatterlists associated with this cmd */
82 u32 tvc_sgl_count;
Nicholas Bellingere31885d2014-02-22 18:34:43 -080083 u32 tvc_prot_sgl_count;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -080084 /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030085 u32 tvc_lun;
86 /* Pointer to the SGL formatted memory from virtio-scsi */
87 struct scatterlist *tvc_sgl;
Nicholas Bellingerb1935f62014-02-22 18:08:24 -080088 struct scatterlist *tvc_prot_sgl;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -070089 struct page **tvc_upages;
Nicholas Bellinger79c14142015-01-27 13:13:12 -080090 /* Pointer to response header iovec */
91 struct iovec *tvc_resp_iov;
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030092 /* Pointer to vhost_scsi for our device */
93 struct vhost_scsi *tvc_vhost;
94 /* Pointer to vhost_virtqueue for the cmd */
95 struct vhost_virtqueue *tvc_vq;
96 /* Pointer to vhost nexus memory */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -080097 struct vhost_scsi_nexus *tvc_nexus;
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030098 /* The TCM I/O descriptor that is accessed via container_of() */
99 struct se_cmd tvc_se_cmd;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800100 /* work item used for cmwq dispatch to vhost_scsi_submission_work() */
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300101 struct work_struct work;
102 /* Copy of the incoming SCSI command descriptor block (CDB) */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800103 unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE];
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300104 /* Sense buffer that will be mapped into outgoing status */
105 unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
106 /* Completed commands list, serviced from vhost worker thread */
107 struct llist_node tvc_completion_list;
108 /* Used to track inflight cmd */
109 struct vhost_scsi_inflight *inflight;
110};
111
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800112struct vhost_scsi_nexus {
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300113 /* Pointer to TCM session for I_T Nexus */
114 struct se_session *tvn_se_sess;
115};
116
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800117struct vhost_scsi_tpg {
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300118 /* Vhost port target portal group tag for TCM */
119 u16 tport_tpgt;
120 /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
121 int tv_tpg_port_count;
122 /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
123 int tv_tpg_vhost_count;
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -0700124 /* Used for enabling T10-PI with legacy devices */
125 int tv_fabric_prot_type;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800126 /* list for vhost_scsi_list */
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300127 struct list_head tv_tpg_list;
128 /* Used to protect access for tpg_nexus */
129 struct mutex tv_tpg_mutex;
130 /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800131 struct vhost_scsi_nexus *tpg_nexus;
132 /* Pointer back to vhost_scsi_tport */
133 struct vhost_scsi_tport *tport;
134 /* Returned by vhost_scsi_make_tpg() */
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300135 struct se_portal_group se_tpg;
136 /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */
137 struct vhost_scsi *vhost_scsi;
138};
139
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800140struct vhost_scsi_tport {
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300141 /* SCSI protocol the tport is providing */
142 u8 tport_proto_id;
143 /* Binary World Wide unique Port Name for Vhost Target port */
144 u64 tport_wwpn;
145 /* ASCII formatted WWPN for Vhost Target port */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800146 char tport_name[VHOST_SCSI_NAMELEN];
147 /* Returned by vhost_scsi_make_tport() */
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300148 struct se_wwn tport_wwn;
149};
150
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800151struct vhost_scsi_evt {
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300152 /* event to be sent to guest */
153 struct virtio_scsi_event event;
154 /* event list, serviced from vhost worker thread */
155 struct llist_node list;
156};
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700157
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700158enum {
159 VHOST_SCSI_VQ_CTL = 0,
160 VHOST_SCSI_VQ_EVT = 1,
161 VHOST_SCSI_VQ_IO = 2,
162};
163
Michael S. Tsirkine72fd722014-11-23 18:01:34 +0200164/* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */
Nicholas Bellinger5dade712013-03-27 17:23:41 -0700165enum {
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800166 VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
Michael S. Tsirkin4e9fa502015-09-09 22:24:56 +0300167 (1ULL << VIRTIO_SCSI_F_T10_PI)
Nicholas Bellinger5dade712013-03-27 17:23:41 -0700168};
169
Asias He1b7f3902013-02-06 13:20:59 +0800170#define VHOST_SCSI_MAX_TARGET 256
171#define VHOST_SCSI_MAX_VQ 128
Asias Hea6c9af82013-04-25 15:35:21 +0800172#define VHOST_SCSI_MAX_EVENT 128
Asias He67e18cf2013-02-05 12:31:57 +0800173
Asias He3ab2e422013-04-27 11:16:48 +0800174struct vhost_scsi_virtqueue {
175 struct vhost_virtqueue vq;
Michael S. Tsirkin3dfbff32013-04-28 15:38:52 +0300176 /*
177 * Reference counting for inflight reqs, used for flush operation. At
178 * each time, one reference tracks new commands submitted, while we
179 * wait for another one to reach 0.
180 */
Asias Hef2f0173d2013-04-27 11:16:49 +0800181 struct vhost_scsi_inflight inflights[2];
Michael S. Tsirkin3dfbff32013-04-28 15:38:52 +0300182 /*
183 * Indicate current inflight in use, protected by vq->mutex.
184 * Writers must also take dev mutex and flush under it.
185 */
Asias Hef2f0173d2013-04-27 11:16:49 +0800186 int inflight_idx;
Asias He3ab2e422013-04-27 11:16:48 +0800187};
188
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700189struct vhost_scsi {
Asias He67e18cf2013-02-05 12:31:57 +0800190 /* Protected by vhost_scsi->dev.mutex */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800191 struct vhost_scsi_tpg **vs_tpg;
Asias He67e18cf2013-02-05 12:31:57 +0800192 char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
Asias He67e18cf2013-02-05 12:31:57 +0800193
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700194 struct vhost_dev dev;
Asias He3ab2e422013-04-27 11:16:48 +0800195 struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ];
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700196
197 struct vhost_work vs_completion_work; /* cmd completion work item */
Asias He9d6064a2013-01-06 14:36:13 +0800198 struct llist_head vs_completion_list; /* cmd completion queue */
Asias Hea6c9af82013-04-25 15:35:21 +0800199
200 struct vhost_work vs_event_work; /* evt injection work item */
201 struct llist_head vs_event_list; /* evt injection queue */
202
203 bool vs_events_missed; /* any missed events, protected by vq->mutex */
204 int vs_events_nr; /* num of pending events, protected by vq->mutex */
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700205};
206
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800207static struct workqueue_struct *vhost_scsi_workqueue;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700208
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800209/* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */
210static DEFINE_MUTEX(vhost_scsi_mutex);
211static LIST_HEAD(vhost_scsi_list);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700212
Nicholas Bellingerb4078b52015-01-28 13:10:51 -0800213static int iov_num_pages(void __user *iov_base, size_t iov_len)
Asias He765b34f2013-01-22 11:20:25 +0800214{
Nicholas Bellingerb4078b52015-01-28 13:10:51 -0800215 return (PAGE_ALIGN((unsigned long)iov_base + iov_len) -
216 ((unsigned long)iov_base & PAGE_MASK)) >> PAGE_SHIFT;
Asias He765b34f2013-01-22 11:20:25 +0800217}
218
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800219static void vhost_scsi_done_inflight(struct kref *kref)
Asias Hef2f0173d2013-04-27 11:16:49 +0800220{
221 struct vhost_scsi_inflight *inflight;
222
223 inflight = container_of(kref, struct vhost_scsi_inflight, kref);
224 complete(&inflight->comp);
225}
226
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800227static void vhost_scsi_init_inflight(struct vhost_scsi *vs,
Asias Hef2f0173d2013-04-27 11:16:49 +0800228 struct vhost_scsi_inflight *old_inflight[])
229{
230 struct vhost_scsi_inflight *new_inflight;
231 struct vhost_virtqueue *vq;
232 int idx, i;
233
234 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
235 vq = &vs->vqs[i].vq;
236
237 mutex_lock(&vq->mutex);
238
239 /* store old infight */
240 idx = vs->vqs[i].inflight_idx;
241 if (old_inflight)
242 old_inflight[i] = &vs->vqs[i].inflights[idx];
243
244 /* setup new infight */
245 vs->vqs[i].inflight_idx = idx ^ 1;
246 new_inflight = &vs->vqs[i].inflights[idx ^ 1];
247 kref_init(&new_inflight->kref);
248 init_completion(&new_inflight->comp);
249
250 mutex_unlock(&vq->mutex);
251 }
252}
253
254static struct vhost_scsi_inflight *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800255vhost_scsi_get_inflight(struct vhost_virtqueue *vq)
Asias Hef2f0173d2013-04-27 11:16:49 +0800256{
257 struct vhost_scsi_inflight *inflight;
258 struct vhost_scsi_virtqueue *svq;
259
260 svq = container_of(vq, struct vhost_scsi_virtqueue, vq);
261 inflight = &svq->inflights[svq->inflight_idx];
262 kref_get(&inflight->kref);
263
264 return inflight;
265}
266
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800267static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight)
Asias Hef2f0173d2013-04-27 11:16:49 +0800268{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800269 kref_put(&inflight->kref, vhost_scsi_done_inflight);
Asias Hef2f0173d2013-04-27 11:16:49 +0800270}
271
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800272static int vhost_scsi_check_true(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700273{
274 return 1;
275}
276
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800277static int vhost_scsi_check_false(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700278{
279 return 0;
280}
281
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800282static char *vhost_scsi_get_fabric_name(void)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700283{
284 return "vhost";
285}
286
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800287static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700288{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800289 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
290 struct vhost_scsi_tpg, se_tpg);
291 struct vhost_scsi_tport *tport = tpg->tport;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700292
293 return &tport->tport_name[0];
294}
295
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800296static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700297{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800298 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
299 struct vhost_scsi_tpg, se_tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700300 return tpg->tport_tpgt;
301}
302
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -0700303static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg)
304{
305 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
306 struct vhost_scsi_tpg, se_tpg);
307
308 return tpg->tv_fabric_prot_type;
309}
310
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800311static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700312{
313 return 1;
314}
315
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800316static void vhost_scsi_release_cmd(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700317{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800318 struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd,
319 struct vhost_scsi_cmd, tvc_se_cmd);
Nicholas Bellingerde1419e2015-01-29 17:21:13 -0800320 struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess;
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800321 int i;
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700322
323 if (tv_cmd->tvc_sgl_count) {
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700324 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
325 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
Michael S. Tsirkind3d665a2013-09-17 22:54:31 +0300326 }
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800327 if (tv_cmd->tvc_prot_sgl_count) {
328 for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++)
329 put_page(sg_page(&tv_cmd->tvc_prot_sgl[i]));
330 }
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700331
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800332 vhost_scsi_put_inflight(tv_cmd->inflight);
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700333 percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700334}
335
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800336static int vhost_scsi_shutdown_session(struct se_session *se_sess)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700337{
338 return 0;
339}
340
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800341static void vhost_scsi_close_session(struct se_session *se_sess)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700342{
343 return;
344}
345
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800346static u32 vhost_scsi_sess_get_index(struct se_session *se_sess)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700347{
348 return 0;
349}
350
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800351static int vhost_scsi_write_pending(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700352{
353 /* Go ahead and process the write immediately */
354 target_execute_cmd(se_cmd);
355 return 0;
356}
357
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800358static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700359{
360 return 0;
361}
362
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800363static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700364{
365 return;
366}
367
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800368static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700369{
370 return 0;
371}
372
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800373static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd)
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700374{
Asias He3c63f662013-05-06 16:38:29 +0800375 struct vhost_scsi *vs = cmd->tvc_vhost;
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700376
Asias He3c63f662013-05-06 16:38:29 +0800377 llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700378
379 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
380}
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700381
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800382static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700383{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800384 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
385 struct vhost_scsi_cmd, tvc_se_cmd);
Asias He3c63f662013-05-06 16:38:29 +0800386 vhost_scsi_complete_cmd(cmd);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700387 return 0;
388}
389
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800390static int vhost_scsi_queue_status(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700391{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800392 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
393 struct vhost_scsi_cmd, tvc_se_cmd);
Asias He3c63f662013-05-06 16:38:29 +0800394 vhost_scsi_complete_cmd(cmd);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700395 return 0;
396}
397
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800398static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700399{
Joern Engelb79fafa2013-07-03 11:22:17 -0400400 return;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700401}
402
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800403static void vhost_scsi_aborted_task(struct se_cmd *se_cmd)
Nicholas Bellinger131e6ab2014-03-22 14:55:56 -0700404{
405 return;
406}
407
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800408static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
Asias Hea6c9af82013-04-25 15:35:21 +0800409{
410 vs->vs_events_nr--;
411 kfree(evt);
412}
413
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800414static struct vhost_scsi_evt *
415vhost_scsi_allocate_evt(struct vhost_scsi *vs,
Asias He683bd962013-05-06 16:38:27 +0800416 u32 event, u32 reason)
Asias Hea6c9af82013-04-25 15:35:21 +0800417{
Asias He3ab2e422013-04-27 11:16:48 +0800418 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800419 struct vhost_scsi_evt *evt;
Asias Hea6c9af82013-04-25 15:35:21 +0800420
421 if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
422 vs->vs_events_missed = true;
423 return NULL;
424 }
425
426 evt = kzalloc(sizeof(*evt), GFP_KERNEL);
427 if (!evt) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800428 vq_err(vq, "Failed to allocate vhost_scsi_evt\n");
Asias Hea6c9af82013-04-25 15:35:21 +0800429 vs->vs_events_missed = true;
430 return NULL;
431 }
432
Michael S. Tsirkine72fd722014-11-23 18:01:34 +0200433 evt->event.event = cpu_to_vhost32(vq, event);
434 evt->event.reason = cpu_to_vhost32(vq, reason);
Asias Hea6c9af82013-04-25 15:35:21 +0800435 vs->vs_events_nr++;
436
437 return evt;
438}
439
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800440static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700441{
Asias He3c63f662013-05-06 16:38:29 +0800442 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700443
444 /* TODO locking against target/backend threads? */
Nicholas Bellinger6c131d02013-06-06 01:44:48 -0700445 transport_generic_free_cmd(se_cmd, 0);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700446
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700447}
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700448
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700449static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
450{
Bart Van Asscheafc16602015-04-27 13:52:36 +0200451 return target_put_sess_cmd(se_cmd);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700452}
453
Asias He683bd962013-05-06 16:38:27 +0800454static void
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800455vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
Asias Hea6c9af82013-04-25 15:35:21 +0800456{
Asias He3ab2e422013-04-27 11:16:48 +0800457 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +0800458 struct virtio_scsi_event *event = &evt->event;
459 struct virtio_scsi_event __user *eventp;
460 unsigned out, in;
461 int head, ret;
462
463 if (!vq->private_data) {
464 vs->vs_events_missed = true;
465 return;
466 }
467
468again:
469 vhost_disable_notify(&vs->dev, vq);
Michael S. Tsirkin47283be2014-06-05 15:20:27 +0300470 head = vhost_get_vq_desc(vq, vq->iov,
Asias Hea6c9af82013-04-25 15:35:21 +0800471 ARRAY_SIZE(vq->iov), &out, &in,
472 NULL, NULL);
473 if (head < 0) {
474 vs->vs_events_missed = true;
475 return;
476 }
477 if (head == vq->num) {
478 if (vhost_enable_notify(&vs->dev, vq))
479 goto again;
480 vs->vs_events_missed = true;
481 return;
482 }
483
484 if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
485 vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
486 vq->iov[out].iov_len);
487 vs->vs_events_missed = true;
488 return;
489 }
490
491 if (vs->vs_events_missed) {
Michael S. Tsirkine72fd722014-11-23 18:01:34 +0200492 event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED);
Asias Hea6c9af82013-04-25 15:35:21 +0800493 vs->vs_events_missed = false;
494 }
495
496 eventp = vq->iov[out].iov_base;
497 ret = __copy_to_user(eventp, event, sizeof(*event));
498 if (!ret)
499 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
500 else
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800501 vq_err(vq, "Faulted on vhost_scsi_send_event\n");
Asias Hea6c9af82013-04-25 15:35:21 +0800502}
503
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800504static void vhost_scsi_evt_work(struct vhost_work *work)
Asias Hea6c9af82013-04-25 15:35:21 +0800505{
506 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
507 vs_event_work);
Asias He3ab2e422013-04-27 11:16:48 +0800508 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800509 struct vhost_scsi_evt *evt;
Asias Hea6c9af82013-04-25 15:35:21 +0800510 struct llist_node *llnode;
511
512 mutex_lock(&vq->mutex);
513 llnode = llist_del_all(&vs->vs_event_list);
514 while (llnode) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800515 evt = llist_entry(llnode, struct vhost_scsi_evt, list);
Asias Hea6c9af82013-04-25 15:35:21 +0800516 llnode = llist_next(llnode);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800517 vhost_scsi_do_evt_work(vs, evt);
518 vhost_scsi_free_evt(vs, evt);
Asias Hea6c9af82013-04-25 15:35:21 +0800519 }
520 mutex_unlock(&vq->mutex);
521}
522
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700523/* Fill in status and signal that we are done processing this command
524 *
525 * This is scheduled in the vhost work queue so we are called with the owner
526 * process mm and can access the vring.
527 */
528static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
529{
530 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
531 vs_completion_work);
Asias He1b7f3902013-02-06 13:20:59 +0800532 DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
Asias He9d6064a2013-01-06 14:36:13 +0800533 struct virtio_scsi_cmd_resp v_rsp;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800534 struct vhost_scsi_cmd *cmd;
Asias He9d6064a2013-01-06 14:36:13 +0800535 struct llist_node *llnode;
536 struct se_cmd *se_cmd;
Nicholas Bellinger79c14142015-01-27 13:13:12 -0800537 struct iov_iter iov_iter;
Asias He1b7f3902013-02-06 13:20:59 +0800538 int ret, vq;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700539
Asias He1b7f3902013-02-06 13:20:59 +0800540 bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
Asias He9d6064a2013-01-06 14:36:13 +0800541 llnode = llist_del_all(&vs->vs_completion_list);
542 while (llnode) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800543 cmd = llist_entry(llnode, struct vhost_scsi_cmd,
Asias He9d6064a2013-01-06 14:36:13 +0800544 tvc_completion_list);
545 llnode = llist_next(llnode);
Asias He3c63f662013-05-06 16:38:29 +0800546 se_cmd = &cmd->tvc_se_cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700547
548 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
Asias He3c63f662013-05-06 16:38:29 +0800549 cmd, se_cmd->residual_count, se_cmd->scsi_status);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700550
551 memset(&v_rsp, 0, sizeof(v_rsp));
Michael S. Tsirkine72fd722014-11-23 18:01:34 +0200552 v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700553 /* TODO is status_qualifier field needed? */
554 v_rsp.status = se_cmd->scsi_status;
Michael S. Tsirkine72fd722014-11-23 18:01:34 +0200555 v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq,
556 se_cmd->scsi_sense_length);
Asias He3c63f662013-05-06 16:38:29 +0800557 memcpy(v_rsp.sense, cmd->tvc_sense_buf,
Michael S. Tsirkine72fd722014-11-23 18:01:34 +0200558 se_cmd->scsi_sense_length);
Nicholas Bellinger79c14142015-01-27 13:13:12 -0800559
560 iov_iter_init(&iov_iter, READ, cmd->tvc_resp_iov,
561 cmd->tvc_in_iovs, sizeof(v_rsp));
562 ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter);
563 if (likely(ret == sizeof(v_rsp))) {
Asias He3ab2e422013-04-27 11:16:48 +0800564 struct vhost_scsi_virtqueue *q;
Asias He3c63f662013-05-06 16:38:29 +0800565 vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
566 q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
Asias He3ab2e422013-04-27 11:16:48 +0800567 vq = q - vs->vqs;
Asias He1b7f3902013-02-06 13:20:59 +0800568 __set_bit(vq, signal);
569 } else
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700570 pr_err("Faulted on virtio_scsi_cmd_resp\n");
571
Asias He3c63f662013-05-06 16:38:29 +0800572 vhost_scsi_free_cmd(cmd);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700573 }
574
Asias He1b7f3902013-02-06 13:20:59 +0800575 vq = -1;
576 while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
577 < VHOST_SCSI_MAX_VQ)
Asias He3ab2e422013-04-27 11:16:48 +0800578 vhost_signal(&vs->dev, &vs->vqs[vq].vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700579}
580
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800581static struct vhost_scsi_cmd *
582vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg,
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800583 unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
584 u32 exp_data_len, int data_direction)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700585{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800586 struct vhost_scsi_cmd *cmd;
587 struct vhost_scsi_nexus *tv_nexus;
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700588 struct se_session *se_sess;
Nicholas Bellingerb1935f62014-02-22 18:08:24 -0800589 struct scatterlist *sg, *prot_sg;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700590 struct page **pages;
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700591 int tag;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700592
Asias He98718312013-05-06 16:38:28 +0800593 tv_nexus = tpg->tpg_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700594 if (!tv_nexus) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800595 pr_err("Unable to locate active struct vhost_scsi_nexus\n");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700596 return ERR_PTR(-EIO);
597 }
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700598 se_sess = tv_nexus->tvn_se_sess;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700599
Kent Overstreet6f6b5d12014-01-19 08:26:37 +0000600 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING);
Nicholas Bellinger4a47d3a2013-09-23 11:42:28 -0700601 if (tag < 0) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800602 pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
Nicholas Bellinger4a47d3a2013-09-23 11:42:28 -0700603 return ERR_PTR(-ENOMEM);
604 }
605
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800606 cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag];
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700607 sg = cmd->tvc_sgl;
Nicholas Bellingerb1935f62014-02-22 18:08:24 -0800608 prot_sg = cmd->tvc_prot_sgl;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700609 pages = cmd->tvc_upages;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800610 memset(cmd, 0, sizeof(struct vhost_scsi_cmd));
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700611
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700612 cmd->tvc_sgl = sg;
Nicholas Bellingerb1935f62014-02-22 18:08:24 -0800613 cmd->tvc_prot_sgl = prot_sg;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700614 cmd->tvc_upages = pages;
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700615 cmd->tvc_se_cmd.map_tag = tag;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800616 cmd->tvc_tag = scsi_tag;
617 cmd->tvc_lun = lun;
618 cmd->tvc_task_attr = task_attr;
Asias He3c63f662013-05-06 16:38:29 +0800619 cmd->tvc_exp_data_len = exp_data_len;
620 cmd->tvc_data_direction = data_direction;
621 cmd->tvc_nexus = tv_nexus;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800622 cmd->inflight = vhost_scsi_get_inflight(vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700623
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800624 memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800625
Asias He3c63f662013-05-06 16:38:29 +0800626 return cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700627}
628
629/*
630 * Map a user memory range into a scatterlist
631 *
632 * Returns the number of scatterlist entries used or -errno on error.
633 */
Asias He683bd962013-05-06 16:38:27 +0800634static int
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800635vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd,
Nicholas Bellingerb4078b52015-01-28 13:10:51 -0800636 void __user *ptr,
637 size_t len,
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700638 struct scatterlist *sgl,
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800639 bool write)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700640{
Nicholas Bellingerb4078b52015-01-28 13:10:51 -0800641 unsigned int npages = 0, offset, nbytes;
642 unsigned int pages_nr = iov_num_pages(ptr, len);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700643 struct scatterlist *sg = sgl;
Nicholas Bellingerb4078b52015-01-28 13:10:51 -0800644 struct page **pages = cmd->tvc_upages;
Asias He18100532013-01-22 11:20:27 +0800645 int ret, i;
646
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800647 if (pages_nr > VHOST_SCSI_PREALLOC_UPAGES) {
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700648 pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800649 " preallocated VHOST_SCSI_PREALLOC_UPAGES: %u\n",
650 pages_nr, VHOST_SCSI_PREALLOC_UPAGES);
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800651 return -ENOBUFS;
652 }
Asias He18100532013-01-22 11:20:27 +0800653
654 ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
655 /* No pages were pinned */
656 if (ret < 0)
657 goto out;
658 /* Less pages pinned than wanted */
659 if (ret != pages_nr) {
660 for (i = 0; i < ret; i++)
661 put_page(pages[i]);
662 ret = -EFAULT;
663 goto out;
664 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700665
666 while (len > 0) {
Asias He18100532013-01-22 11:20:27 +0800667 offset = (uintptr_t)ptr & ~PAGE_MASK;
668 nbytes = min_t(unsigned int, PAGE_SIZE - offset, len);
669 sg_set_page(sg, pages[npages], nbytes, offset);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700670 ptr += nbytes;
671 len -= nbytes;
672 sg++;
673 npages++;
674 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700675
Asias He18100532013-01-22 11:20:27 +0800676out:
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700677 return ret;
678}
679
Asias He683bd962013-05-06 16:38:27 +0800680static int
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800681vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700682{
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800683 int sgl_count = 0;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700684
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800685 if (!iter || !iter->iov) {
686 pr_err("%s: iter->iov is NULL, but expected bytes: %zu"
687 " present\n", __func__, bytes);
688 return -EINVAL;
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800689 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700690
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800691 sgl_count = iov_iter_npages(iter, 0xffff);
692 if (sgl_count > max_sgls) {
693 pr_err("%s: requested sgl_count: %d exceeds pre-allocated"
694 " max_sgls: %d\n", __func__, sgl_count, max_sgls);
695 return -EINVAL;
696 }
697 return sgl_count;
698}
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700699
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800700static int
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800701vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write,
702 struct iov_iter *iter,
703 struct scatterlist *sg, int sg_count)
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800704{
705 size_t off = iter->iov_offset;
706 int i, ret;
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800707
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800708 for (i = 0; i < iter->nr_segs; i++) {
709 void __user *base = iter->iov[i].iov_base + off;
710 size_t len = iter->iov[i].iov_len - off;
711
712 ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700713 if (ret < 0) {
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800714 for (i = 0; i < sg_count; i++) {
715 struct page *page = sg_page(&sg[i]);
716 if (page)
717 put_page(page);
718 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700719 return ret;
720 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700721 sg += ret;
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800722 off = 0;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700723 }
724 return 0;
725}
726
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800727static int
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800728vhost_scsi_mapal(struct vhost_scsi_cmd *cmd,
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800729 size_t prot_bytes, struct iov_iter *prot_iter,
730 size_t data_bytes, struct iov_iter *data_iter)
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800731{
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800732 int sgl_count, ret;
733 bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE);
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800734
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800735 if (prot_bytes) {
736 sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800737 VHOST_SCSI_PREALLOC_PROT_SGLS);
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800738 if (sgl_count < 0)
739 return sgl_count;
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800740
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800741 sg_init_table(cmd->tvc_prot_sgl, sgl_count);
742 cmd->tvc_prot_sgl_count = sgl_count;
743 pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
744 cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count);
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800745
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800746 ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter,
747 cmd->tvc_prot_sgl,
748 cmd->tvc_prot_sgl_count);
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800749 if (ret < 0) {
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800750 cmd->tvc_prot_sgl_count = 0;
751 return ret;
752 }
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800753 }
754 sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800755 VHOST_SCSI_PREALLOC_SGLS);
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800756 if (sgl_count < 0)
757 return sgl_count;
758
759 sg_init_table(cmd->tvc_sgl, sgl_count);
760 cmd->tvc_sgl_count = sgl_count;
761 pr_debug("%s data_sg %p data_sgl_count %u\n", __func__,
762 cmd->tvc_sgl, cmd->tvc_sgl_count);
763
764 ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter,
765 cmd->tvc_sgl, cmd->tvc_sgl_count);
766 if (ret < 0) {
767 cmd->tvc_sgl_count = 0;
768 return ret;
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800769 }
770 return 0;
771}
772
Nicholas Bellinger46243862014-12-21 10:42:08 -0800773static int vhost_scsi_to_tcm_attr(int attr)
774{
775 switch (attr) {
776 case VIRTIO_SCSI_S_SIMPLE:
777 return TCM_SIMPLE_TAG;
778 case VIRTIO_SCSI_S_ORDERED:
779 return TCM_ORDERED_TAG;
780 case VIRTIO_SCSI_S_HEAD:
781 return TCM_HEAD_TAG;
782 case VIRTIO_SCSI_S_ACA:
783 return TCM_ACA_TAG;
784 default:
785 break;
786 }
787 return TCM_SIMPLE_TAG;
788}
789
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800790static void vhost_scsi_submission_work(struct work_struct *work)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700791{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800792 struct vhost_scsi_cmd *cmd =
793 container_of(work, struct vhost_scsi_cmd, work);
794 struct vhost_scsi_nexus *tv_nexus;
Asias He3c63f662013-05-06 16:38:29 +0800795 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800796 struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
797 int rc;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700798
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800799 /* FIXME: BIDI operation */
Asias He3c63f662013-05-06 16:38:29 +0800800 if (cmd->tvc_sgl_count) {
801 sg_ptr = cmd->tvc_sgl;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800802
803 if (cmd->tvc_prot_sgl_count)
804 sg_prot_ptr = cmd->tvc_prot_sgl;
805 else
806 se_cmd->prot_pto = true;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700807 } else {
808 sg_ptr = NULL;
809 }
Asias He3c63f662013-05-06 16:38:29 +0800810 tv_nexus = cmd->tvc_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700811
Bart Van Assche649ee052015-04-14 13:26:44 +0200812 se_cmd->tag = 0;
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700813 rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
Asias He3c63f662013-05-06 16:38:29 +0800814 cmd->tvc_cdb, &cmd->tvc_sense_buf[0],
815 cmd->tvc_lun, cmd->tvc_exp_data_len,
Nicholas Bellinger46243862014-12-21 10:42:08 -0800816 vhost_scsi_to_tcm_attr(cmd->tvc_task_attr),
817 cmd->tvc_data_direction, TARGET_SCF_ACK_KREF,
818 sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr,
819 cmd->tvc_prot_sgl_count);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700820 if (rc < 0) {
821 transport_send_check_condition_and_sense(se_cmd,
Nicholas Bellinger9f0abc12012-10-01 18:40:55 -0700822 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700823 transport_generic_free_cmd(se_cmd, 0);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700824 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700825}
826
Asias He683bd962013-05-06 16:38:27 +0800827static void
828vhost_scsi_send_bad_target(struct vhost_scsi *vs,
829 struct vhost_virtqueue *vq,
830 int head, unsigned out)
Asias He637ab212013-04-10 15:06:15 +0800831{
832 struct virtio_scsi_cmd_resp __user *resp;
833 struct virtio_scsi_cmd_resp rsp;
834 int ret;
835
836 memset(&rsp, 0, sizeof(rsp));
837 rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
838 resp = vq->iov[out].iov_base;
839 ret = __copy_to_user(resp, &rsp, sizeof(rsp));
840 if (!ret)
841 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
842 else
843 pr_err("Faulted on virtio_scsi_cmd_resp\n");
844}
845
Asias He683bd962013-05-06 16:38:27 +0800846static void
847vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700848{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800849 struct vhost_scsi_tpg **vs_tpg, *tpg;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700850 struct virtio_scsi_cmd_req v_req;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800851 struct virtio_scsi_cmd_req_pi v_req_pi;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800852 struct vhost_scsi_cmd *cmd;
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800853 struct iov_iter out_iter, in_iter, prot_iter, data_iter;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800854 u64 tag;
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800855 u32 exp_data_len, data_direction;
856 unsigned out, in;
857 int head, ret, prot_bytes;
858 size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp);
859 size_t out_size, in_size;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800860 u16 lun;
861 u8 *target, *lunp, task_attr;
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800862 bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800863 void *req, *cdb;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700864
Asias Hee7802212013-05-07 14:54:35 +0800865 mutex_lock(&vq->mutex);
Asias He4f7f46d2013-04-03 14:17:37 +0800866 /*
867 * We can handle the vq only after the endpoint is setup by calling the
868 * VHOST_SCSI_SET_ENDPOINT ioctl.
Asias He4f7f46d2013-04-03 14:17:37 +0800869 */
Asias Hee7802212013-05-07 14:54:35 +0800870 vs_tpg = vq->private_data;
Asias He4f7f46d2013-04-03 14:17:37 +0800871 if (!vs_tpg)
Asias Hee7802212013-05-07 14:54:35 +0800872 goto out;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700873
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700874 vhost_disable_notify(&vs->dev, vq);
875
876 for (;;) {
Michael S. Tsirkin47283be2014-06-05 15:20:27 +0300877 head = vhost_get_vq_desc(vq, vq->iov,
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800878 ARRAY_SIZE(vq->iov), &out, &in,
879 NULL, NULL);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700880 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800881 head, out, in);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700882 /* On error, stop handling until the next kick. */
883 if (unlikely(head < 0))
884 break;
885 /* Nothing new? Wait for eventfd to tell us they refilled. */
886 if (head == vq->num) {
887 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
888 vhost_disable_notify(&vs->dev, vq);
889 continue;
890 }
891 break;
892 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700893 /*
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800894 * Check for a sane response buffer so we can report early
895 * errors back to the guest.
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700896 */
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800897 if (unlikely(vq->iov[out].iov_len < rsp_size)) {
898 vq_err(vq, "Expecting at least virtio_scsi_cmd_resp"
899 " size, got %zu bytes\n", vq->iov[out].iov_len);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700900 break;
901 }
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800902 /*
903 * Setup pointers and values based upon different virtio-scsi
904 * request header if T10_PI is enabled in KVM guest.
905 */
906 if (t10_pi) {
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800907 req = &v_req_pi;
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800908 req_size = sizeof(v_req_pi);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800909 lunp = &v_req_pi.lun[0];
910 target = &v_req_pi.lun[1];
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800911 } else {
912 req = &v_req;
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800913 req_size = sizeof(v_req);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800914 lunp = &v_req.lun[0];
915 target = &v_req.lun[1];
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800916 }
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800917 /*
918 * FIXME: Not correct for BIDI operation
919 */
920 out_size = iov_length(vq->iov, out);
921 in_size = iov_length(&vq->iov[out], in);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800922
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800923 /*
924 * Copy over the virtio-scsi request header, which for a
925 * ANY_LAYOUT enabled guest may span multiple iovecs, or a
926 * single iovec may contain both the header + outgoing
927 * WRITE payloads.
928 *
929 * copy_from_iter() will advance out_iter, so that it will
930 * point at the start of the outgoing WRITE payload, if
931 * DMA_TO_DEVICE is set.
932 */
933 iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700934
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800935 ret = copy_from_iter(req, req_size, &out_iter);
936 if (unlikely(ret != req_size)) {
937 vq_err(vq, "Faulted on copy_from_iter\n");
Nicholas Bellingerde1419e2015-01-29 17:21:13 -0800938 vhost_scsi_send_bad_target(vs, vq, head, out);
939 continue;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700940 }
Venkatesh Srinivas7fe412d2014-02-24 14:13:32 -0800941 /* virtio-scsi spec requires byte 0 of the lun to be 1 */
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800942 if (unlikely(*lunp != 1)) {
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800943 vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp);
Venkatesh Srinivas7fe412d2014-02-24 14:13:32 -0800944 vhost_scsi_send_bad_target(vs, vq, head, out);
945 continue;
946 }
947
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800948 tpg = ACCESS_ONCE(vs_tpg[*target]);
Asias He98718312013-05-06 16:38:28 +0800949 if (unlikely(!tpg)) {
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800950 /* Target does not exist, fail the request */
Asias He637ab212013-04-10 15:06:15 +0800951 vhost_scsi_send_bad_target(vs, vq, head, out);
Asias He67e18cf2013-02-05 12:31:57 +0800952 continue;
953 }
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800954 /*
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800955 * Determine data_direction by calculating the total outgoing
956 * iovec sizes + incoming iovec sizes vs. virtio-scsi request +
957 * response headers respectively.
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800958 *
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800959 * For DMA_TO_DEVICE this is out_iter, which is already pointing
960 * to the right place.
961 *
962 * For DMA_FROM_DEVICE, the iovec will be just past the end
963 * of the virtio-scsi response header in either the same
964 * or immediately following iovec.
965 *
966 * Any associated T10_PI bytes for the outgoing / incoming
967 * payloads are included in calculation of exp_data_len here.
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800968 */
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800969 prot_bytes = 0;
970
971 if (out_size > req_size) {
972 data_direction = DMA_TO_DEVICE;
973 exp_data_len = out_size - req_size;
974 data_iter = out_iter;
975 } else if (in_size > rsp_size) {
976 data_direction = DMA_FROM_DEVICE;
977 exp_data_len = in_size - rsp_size;
978
979 iov_iter_init(&in_iter, READ, &vq->iov[out], in,
980 rsp_size + exp_data_len);
981 iov_iter_advance(&in_iter, rsp_size);
982 data_iter = in_iter;
983 } else {
984 data_direction = DMA_NONE;
985 exp_data_len = 0;
986 }
987 /*
988 * If T10_PI header + payload is present, setup prot_iter values
989 * and recalculate data_iter for vhost_scsi_mapal() mapping to
990 * host scatterlists via get_user_pages_fast().
991 */
992 if (t10_pi) {
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800993 if (v_req_pi.pi_bytesout) {
994 if (data_direction != DMA_TO_DEVICE) {
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -0800995 vq_err(vq, "Received non zero pi_bytesout,"
996 " but wrong data_direction\n");
Nicholas Bellingerde1419e2015-01-29 17:21:13 -0800997 vhost_scsi_send_bad_target(vs, vq, head, out);
998 continue;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800999 }
Michael S. Tsirkine72fd722014-11-23 18:01:34 +02001000 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001001 } else if (v_req_pi.pi_bytesin) {
1002 if (data_direction != DMA_FROM_DEVICE) {
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001003 vq_err(vq, "Received non zero pi_bytesin,"
1004 " but wrong data_direction\n");
Nicholas Bellingerde1419e2015-01-29 17:21:13 -08001005 vhost_scsi_send_bad_target(vs, vq, head, out);
1006 continue;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001007 }
Michael S. Tsirkine72fd722014-11-23 18:01:34 +02001008 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001009 }
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001010 /*
1011 * Set prot_iter to data_iter, and advance past any
1012 * preceeding prot_bytes that may be present.
1013 *
1014 * Also fix up the exp_data_len to reflect only the
1015 * actual data payload length.
1016 */
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001017 if (prot_bytes) {
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001018 exp_data_len -= prot_bytes;
1019 prot_iter = data_iter;
1020 iov_iter_advance(&data_iter, prot_bytes);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001021 }
Michael S. Tsirkine72fd722014-11-23 18:01:34 +02001022 tag = vhost64_to_cpu(vq, v_req_pi.tag);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001023 task_attr = v_req_pi.task_attr;
1024 cdb = &v_req_pi.cdb[0];
1025 lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
1026 } else {
Michael S. Tsirkine72fd722014-11-23 18:01:34 +02001027 tag = vhost64_to_cpu(vq, v_req.tag);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001028 task_attr = v_req.task_attr;
1029 cdb = &v_req.cdb[0];
1030 lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
1031 }
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001032 /*
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001033 * Check that the received CDB size does not exceeded our
1034 * hardcoded max for vhost-scsi, then get a pre-allocated
1035 * cmd descriptor for the new virtio-scsi tag.
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001036 *
1037 * TODO what if cdb was too small for varlen cdb header?
1038 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001039 if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) {
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001040 vq_err(vq, "Received SCSI CDB with command_size: %d that"
1041 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001042 scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE);
Nicholas Bellingerde1419e2015-01-29 17:21:13 -08001043 vhost_scsi_send_bad_target(vs, vq, head, out);
1044 continue;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001045 }
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001046 cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr,
Nicholas Bellinger9f977ef2014-06-10 01:19:38 -07001047 exp_data_len + prot_bytes,
1048 data_direction);
Asias He3c63f662013-05-06 16:38:29 +08001049 if (IS_ERR(cmd)) {
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -07001050 vq_err(vq, "vhost_scsi_get_tag failed %ld\n",
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001051 PTR_ERR(cmd));
Nicholas Bellingerde1419e2015-01-29 17:21:13 -08001052 vhost_scsi_send_bad_target(vs, vq, head, out);
1053 continue;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001054 }
Asias He3c63f662013-05-06 16:38:29 +08001055 cmd->tvc_vhost = vs;
1056 cmd->tvc_vq = vq;
Nicholas Bellinger79c14142015-01-27 13:13:12 -08001057 cmd->tvc_resp_iov = &vq->iov[out];
1058 cmd->tvc_in_iovs = in;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001059
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001060 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001061 cmd->tvc_cdb[0], cmd->tvc_lun);
1062 pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:"
1063 " %d\n", cmd, exp_data_len, prot_bytes, data_direction);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001064
1065 if (data_direction != DMA_NONE) {
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001066 ret = vhost_scsi_mapal(cmd,
1067 prot_bytes, &prot_iter,
1068 exp_data_len, &data_iter);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001069 if (unlikely(ret)) {
1070 vq_err(vq, "Failed to map iov to sgl\n");
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001071 vhost_scsi_release_cmd(&cmd->tvc_se_cmd);
Nicholas Bellingerde1419e2015-01-29 17:21:13 -08001072 vhost_scsi_send_bad_target(vs, vq, head, out);
1073 continue;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001074 }
1075 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001076 /*
1077 * Save the descriptor from vhost_get_vq_desc() to be used to
1078 * complete the virtio-scsi request in TCM callback context via
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001079 * vhost_scsi_queue_data_in() and vhost_scsi_queue_status()
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001080 */
Asias He3c63f662013-05-06 16:38:29 +08001081 cmd->tvc_vq_desc = head;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001082 /*
Nicholas Bellinger09b13fa2015-01-25 21:14:58 -08001083 * Dispatch cmd descriptor for cmwq execution in process
1084 * context provided by vhost_scsi_workqueue. This also ensures
1085 * cmd is executed on the same kworker CPU as this vhost
1086 * thread to gain positive L2 cache locality effects.
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001087 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001088 INIT_WORK(&cmd->work, vhost_scsi_submission_work);
1089 queue_work(vhost_scsi_workqueue, &cmd->work);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001090 }
Asias Hee7802212013-05-07 14:54:35 +08001091out:
Asias He7ea206c2013-04-10 15:06:14 +08001092 mutex_unlock(&vq->mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001093}
1094
1095static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
1096{
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001097 pr_debug("%s: The handling func for control queue.\n", __func__);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001098}
1099
Asias He683bd962013-05-06 16:38:27 +08001100static void
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001101vhost_scsi_send_evt(struct vhost_scsi *vs,
1102 struct vhost_scsi_tpg *tpg,
Asias He683bd962013-05-06 16:38:27 +08001103 struct se_lun *lun,
1104 u32 event,
1105 u32 reason)
Asias Hea6c9af82013-04-25 15:35:21 +08001106{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001107 struct vhost_scsi_evt *evt;
Asias Hea6c9af82013-04-25 15:35:21 +08001108
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001109 evt = vhost_scsi_allocate_evt(vs, event, reason);
Asias Hea6c9af82013-04-25 15:35:21 +08001110 if (!evt)
1111 return;
1112
1113 if (tpg && lun) {
1114 /* TODO: share lun setup code with virtio-scsi.ko */
1115 /*
1116 * Note: evt->event is zeroed when we allocate it and
1117 * lun[4-7] need to be zero according to virtio-scsi spec.
1118 */
1119 evt->event.lun[0] = 0x01;
Dan Carpenter59c816c2015-02-05 10:37:33 +03001120 evt->event.lun[1] = tpg->tport_tpgt;
Asias Hea6c9af82013-04-25 15:35:21 +08001121 if (lun->unpacked_lun >= 256)
1122 evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
1123 evt->event.lun[3] = lun->unpacked_lun & 0xFF;
1124 }
1125
1126 llist_add(&evt->list, &vs->vs_event_list);
1127 vhost_work_queue(&vs->dev, &vs->vs_event_work);
1128}
1129
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001130static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
1131{
Asias Hea6c9af82013-04-25 15:35:21 +08001132 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1133 poll.work);
1134 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1135
1136 mutex_lock(&vq->mutex);
1137 if (!vq->private_data)
1138 goto out;
1139
1140 if (vs->vs_events_missed)
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001141 vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
Asias Hea6c9af82013-04-25 15:35:21 +08001142out:
1143 mutex_unlock(&vq->mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001144}
1145
1146static void vhost_scsi_handle_kick(struct vhost_work *work)
1147{
1148 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1149 poll.work);
1150 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1151
Asias He1b7f3902013-02-06 13:20:59 +08001152 vhost_scsi_handle_vq(vs, vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001153}
1154
Asias He4f7f46d2013-04-03 14:17:37 +08001155static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
1156{
Asias He3ab2e422013-04-27 11:16:48 +08001157 vhost_poll_flush(&vs->vqs[index].vq.poll);
Asias He4f7f46d2013-04-03 14:17:37 +08001158}
1159
Michael S. Tsirkin3dfbff32013-04-28 15:38:52 +03001160/* Callers must hold dev mutex */
Asias He4f7f46d2013-04-03 14:17:37 +08001161static void vhost_scsi_flush(struct vhost_scsi *vs)
1162{
Asias Hef2f0173d2013-04-27 11:16:49 +08001163 struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];
Asias He4f7f46d2013-04-03 14:17:37 +08001164 int i;
1165
Asias Hef2f0173d2013-04-27 11:16:49 +08001166 /* Init new inflight and remember the old inflight */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001167 vhost_scsi_init_inflight(vs, old_inflight);
Asias Hef2f0173d2013-04-27 11:16:49 +08001168
1169 /*
1170 * The inflight->kref was initialized to 1. We decrement it here to
1171 * indicate the start of the flush operation so that it will reach 0
1172 * when all the reqs are finished.
1173 */
1174 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001175 kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight);
Asias Hef2f0173d2013-04-27 11:16:49 +08001176
1177 /* Flush both the vhost poll and vhost work */
Asias He4f7f46d2013-04-03 14:17:37 +08001178 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1179 vhost_scsi_flush_vq(vs, i);
1180 vhost_work_flush(&vs->dev, &vs->vs_completion_work);
Asias Hea6c9af82013-04-25 15:35:21 +08001181 vhost_work_flush(&vs->dev, &vs->vs_event_work);
Asias Hef2f0173d2013-04-27 11:16:49 +08001182
1183 /* Wait for all reqs issued before the flush to be finished */
1184 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1185 wait_for_completion(&old_inflight[i]->comp);
Asias He4f7f46d2013-04-03 14:17:37 +08001186}
1187
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001188/*
1189 * Called from vhost_scsi_ioctl() context to walk the list of available
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001190 * vhost_scsi_tpg with an active struct vhost_scsi_nexus
Asias Hef2b7daf2013-04-25 15:35:20 +08001191 *
1192 * The lock nesting rule is:
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001193 * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001194 */
Asias He683bd962013-05-06 16:38:27 +08001195static int
1196vhost_scsi_set_endpoint(struct vhost_scsi *vs,
1197 struct vhost_scsi_target *t)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001198{
Nicholas Bellingerab8edab2014-10-08 06:19:20 +00001199 struct se_portal_group *se_tpg;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001200 struct vhost_scsi_tport *tv_tport;
1201 struct vhost_scsi_tpg *tpg;
1202 struct vhost_scsi_tpg **vs_tpg;
Asias He4f7f46d2013-04-03 14:17:37 +08001203 struct vhost_virtqueue *vq;
1204 int index, ret, i, len;
Asias He67e18cf2013-02-05 12:31:57 +08001205 bool match = false;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001206
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001207 mutex_lock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001208 mutex_lock(&vs->dev.mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001209
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001210 /* Verify that ring has been setup correctly. */
1211 for (index = 0; index < vs->dev.nvqs; ++index) {
1212 /* Verify that ring has been setup correctly. */
Asias He3ab2e422013-04-27 11:16:48 +08001213 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
Asias Hef2b7daf2013-04-25 15:35:20 +08001214 ret = -EFAULT;
1215 goto out;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001216 }
1217 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001218
Asias He4f7f46d2013-04-03 14:17:37 +08001219 len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
1220 vs_tpg = kzalloc(len, GFP_KERNEL);
1221 if (!vs_tpg) {
Asias Hef2b7daf2013-04-25 15:35:20 +08001222 ret = -ENOMEM;
1223 goto out;
Asias He4f7f46d2013-04-03 14:17:37 +08001224 }
1225 if (vs->vs_tpg)
1226 memcpy(vs_tpg, vs->vs_tpg, len);
1227
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001228 list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) {
Asias He98718312013-05-06 16:38:28 +08001229 mutex_lock(&tpg->tv_tpg_mutex);
1230 if (!tpg->tpg_nexus) {
1231 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001232 continue;
1233 }
Asias He98718312013-05-06 16:38:28 +08001234 if (tpg->tv_tpg_vhost_count != 0) {
1235 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001236 continue;
1237 }
Asias He98718312013-05-06 16:38:28 +08001238 tv_tport = tpg->tport;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001239
Asias He67e18cf2013-02-05 12:31:57 +08001240 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
Asias He98718312013-05-06 16:38:28 +08001241 if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
Asias He4f7f46d2013-04-03 14:17:37 +08001242 kfree(vs_tpg);
Asias He98718312013-05-06 16:38:28 +08001243 mutex_unlock(&tpg->tv_tpg_mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001244 ret = -EEXIST;
1245 goto out;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001246 }
Nicholas Bellingerab8edab2014-10-08 06:19:20 +00001247 /*
1248 * In order to ensure individual vhost-scsi configfs
1249 * groups cannot be removed while in use by vhost ioctl,
1250 * go ahead and take an explicit se_tpg->tpg_group.cg_item
1251 * dependency now.
1252 */
1253 se_tpg = &tpg->se_tpg;
Christoph Hellwigd588cf82015-05-03 08:50:52 +02001254 ret = target_depend_item(&se_tpg->tpg_group.cg_item);
Nicholas Bellingerab8edab2014-10-08 06:19:20 +00001255 if (ret) {
1256 pr_warn("configfs_depend_item() failed: %d\n", ret);
1257 kfree(vs_tpg);
1258 mutex_unlock(&tpg->tv_tpg_mutex);
1259 goto out;
1260 }
Asias He98718312013-05-06 16:38:28 +08001261 tpg->tv_tpg_vhost_count++;
1262 tpg->vhost_scsi = vs;
1263 vs_tpg[tpg->tport_tpgt] = tpg;
Peter Zijlstra4e857c52014-03-17 18:06:10 +01001264 smp_mb__after_atomic();
Asias He67e18cf2013-02-05 12:31:57 +08001265 match = true;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001266 }
Asias He98718312013-05-06 16:38:28 +08001267 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001268 }
Asias He67e18cf2013-02-05 12:31:57 +08001269
1270 if (match) {
1271 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1272 sizeof(vs->vs_vhost_wwpn));
Asias He4f7f46d2013-04-03 14:17:37 +08001273 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
Asias He3ab2e422013-04-27 11:16:48 +08001274 vq = &vs->vqs[i].vq;
Asias He4f7f46d2013-04-03 14:17:37 +08001275 mutex_lock(&vq->mutex);
Asias He22fa90c2013-05-07 14:54:36 +08001276 vq->private_data = vs_tpg;
Asias Hedfd5d562013-04-03 14:17:38 +08001277 vhost_init_used(vq);
Asias He4f7f46d2013-04-03 14:17:37 +08001278 mutex_unlock(&vq->mutex);
1279 }
Asias He67e18cf2013-02-05 12:31:57 +08001280 ret = 0;
1281 } else {
1282 ret = -EEXIST;
1283 }
1284
Asias He4f7f46d2013-04-03 14:17:37 +08001285 /*
1286 * Act as synchronize_rcu to make sure access to
1287 * old vs->vs_tpg is finished.
1288 */
1289 vhost_scsi_flush(vs);
1290 kfree(vs->vs_tpg);
1291 vs->vs_tpg = vs_tpg;
1292
Asias Hef2b7daf2013-04-25 15:35:20 +08001293out:
Asias He67e18cf2013-02-05 12:31:57 +08001294 mutex_unlock(&vs->dev.mutex);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001295 mutex_unlock(&vhost_scsi_mutex);
Asias He67e18cf2013-02-05 12:31:57 +08001296 return ret;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001297}
1298
Asias He683bd962013-05-06 16:38:27 +08001299static int
1300vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
1301 struct vhost_scsi_target *t)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001302{
Nicholas Bellingerab8edab2014-10-08 06:19:20 +00001303 struct se_portal_group *se_tpg;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001304 struct vhost_scsi_tport *tv_tport;
1305 struct vhost_scsi_tpg *tpg;
Asias He4f7f46d2013-04-03 14:17:37 +08001306 struct vhost_virtqueue *vq;
1307 bool match = false;
Asias He67e18cf2013-02-05 12:31:57 +08001308 int index, ret, i;
1309 u8 target;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001310
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001311 mutex_lock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001312 mutex_lock(&vs->dev.mutex);
1313 /* Verify that ring has been setup correctly. */
1314 for (index = 0; index < vs->dev.nvqs; ++index) {
Asias He3ab2e422013-04-27 11:16:48 +08001315 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001316 ret = -EFAULT;
Asias He038e0af2013-03-15 09:14:05 +08001317 goto err_dev;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001318 }
1319 }
Asias He4f7f46d2013-04-03 14:17:37 +08001320
1321 if (!vs->vs_tpg) {
Asias Hef2b7daf2013-04-25 15:35:20 +08001322 ret = 0;
1323 goto err_dev;
Asias He4f7f46d2013-04-03 14:17:37 +08001324 }
1325
Asias He67e18cf2013-02-05 12:31:57 +08001326 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1327 target = i;
Asias He98718312013-05-06 16:38:28 +08001328 tpg = vs->vs_tpg[target];
1329 if (!tpg)
Asias He67e18cf2013-02-05 12:31:57 +08001330 continue;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001331
Asias He98718312013-05-06 16:38:28 +08001332 mutex_lock(&tpg->tv_tpg_mutex);
1333 tv_tport = tpg->tport;
Asias He67e18cf2013-02-05 12:31:57 +08001334 if (!tv_tport) {
1335 ret = -ENODEV;
Asias He038e0af2013-03-15 09:14:05 +08001336 goto err_tpg;
Asias He67e18cf2013-02-05 12:31:57 +08001337 }
1338
1339 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
Asias He98718312013-05-06 16:38:28 +08001340 pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
Asias He67e18cf2013-02-05 12:31:57 +08001341 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
Asias He98718312013-05-06 16:38:28 +08001342 tv_tport->tport_name, tpg->tport_tpgt,
Asias He67e18cf2013-02-05 12:31:57 +08001343 t->vhost_wwpn, t->vhost_tpgt);
1344 ret = -EINVAL;
Asias He038e0af2013-03-15 09:14:05 +08001345 goto err_tpg;
Asias He67e18cf2013-02-05 12:31:57 +08001346 }
Asias He98718312013-05-06 16:38:28 +08001347 tpg->tv_tpg_vhost_count--;
1348 tpg->vhost_scsi = NULL;
Asias He67e18cf2013-02-05 12:31:57 +08001349 vs->vs_tpg[target] = NULL;
Asias He4f7f46d2013-04-03 14:17:37 +08001350 match = true;
Asias He98718312013-05-06 16:38:28 +08001351 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellingerab8edab2014-10-08 06:19:20 +00001352 /*
1353 * Release se_tpg->tpg_group.cg_item configfs dependency now
1354 * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur.
1355 */
1356 se_tpg = &tpg->se_tpg;
Christoph Hellwigd588cf82015-05-03 08:50:52 +02001357 target_undepend_item(&se_tpg->tpg_group.cg_item);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001358 }
Asias He4f7f46d2013-04-03 14:17:37 +08001359 if (match) {
1360 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
Asias He3ab2e422013-04-27 11:16:48 +08001361 vq = &vs->vqs[i].vq;
Asias He4f7f46d2013-04-03 14:17:37 +08001362 mutex_lock(&vq->mutex);
Asias He22fa90c2013-05-07 14:54:36 +08001363 vq->private_data = NULL;
Asias He4f7f46d2013-04-03 14:17:37 +08001364 mutex_unlock(&vq->mutex);
1365 }
1366 }
1367 /*
1368 * Act as synchronize_rcu to make sure access to
1369 * old vs->vs_tpg is finished.
1370 */
1371 vhost_scsi_flush(vs);
1372 kfree(vs->vs_tpg);
1373 vs->vs_tpg = NULL;
Asias Hea6c9af82013-04-25 15:35:21 +08001374 WARN_ON(vs->vs_events_nr);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001375 mutex_unlock(&vs->dev.mutex);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001376 mutex_unlock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001377 return 0;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001378
Asias He038e0af2013-03-15 09:14:05 +08001379err_tpg:
Asias He98718312013-05-06 16:38:28 +08001380 mutex_unlock(&tpg->tv_tpg_mutex);
Asias He038e0af2013-03-15 09:14:05 +08001381err_dev:
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001382 mutex_unlock(&vs->dev.mutex);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001383 mutex_unlock(&vhost_scsi_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001384 return ret;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001385}
1386
Asias He4f7f46d2013-04-03 14:17:37 +08001387static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1388{
Michael S. Tsirkinea16c512014-06-05 15:20:23 +03001389 struct vhost_virtqueue *vq;
1390 int i;
1391
Asias He4f7f46d2013-04-03 14:17:37 +08001392 if (features & ~VHOST_SCSI_FEATURES)
1393 return -EOPNOTSUPP;
1394
1395 mutex_lock(&vs->dev.mutex);
1396 if ((features & (1 << VHOST_F_LOG_ALL)) &&
1397 !vhost_log_access_ok(&vs->dev)) {
1398 mutex_unlock(&vs->dev.mutex);
1399 return -EFAULT;
1400 }
Michael S. Tsirkinea16c512014-06-05 15:20:23 +03001401
1402 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1403 vq = &vs->vqs[i].vq;
1404 mutex_lock(&vq->mutex);
1405 vq->acked_features = features;
1406 mutex_unlock(&vq->mutex);
1407 }
Asias He4f7f46d2013-04-03 14:17:37 +08001408 mutex_unlock(&vs->dev.mutex);
1409 return 0;
1410}
1411
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001412static int vhost_scsi_open(struct inode *inode, struct file *f)
1413{
Asias Hec7289312013-05-06 16:38:26 +08001414 struct vhost_scsi *vs;
Asias He3ab2e422013-04-27 11:16:48 +08001415 struct vhost_virtqueue **vqs;
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001416 int r = -ENOMEM, i;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001417
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001418 vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
1419 if (!vs) {
1420 vs = vzalloc(sizeof(*vs));
1421 if (!vs)
1422 goto err_vs;
1423 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001424
Asias He3ab2e422013-04-27 11:16:48 +08001425 vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL);
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001426 if (!vqs)
1427 goto err_vqs;
Asias He3ab2e422013-04-27 11:16:48 +08001428
Asias Hec7289312013-05-06 16:38:26 +08001429 vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001430 vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);
Asias Hea6c9af82013-04-25 15:35:21 +08001431
Asias Hec7289312013-05-06 16:38:26 +08001432 vs->vs_events_nr = 0;
1433 vs->vs_events_missed = false;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001434
Asias Hec7289312013-05-06 16:38:26 +08001435 vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
1436 vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1437 vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1438 vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
Asias He3ab2e422013-04-27 11:16:48 +08001439 for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
Asias Hec7289312013-05-06 16:38:26 +08001440 vqs[i] = &vs->vqs[i].vq;
1441 vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
Asias He3ab2e422013-04-27 11:16:48 +08001442 }
Zhi Yong Wu59566b6e2013-12-07 04:13:03 +08001443 vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ);
Asias Hef2f0173d2013-04-27 11:16:49 +08001444
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001445 vhost_scsi_init_inflight(vs, NULL);
Asias Hef2f0173d2013-04-27 11:16:49 +08001446
Asias Hec7289312013-05-06 16:38:26 +08001447 f->private_data = vs;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001448 return 0;
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001449
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001450err_vqs:
Michael S. Tsirkin684044412014-06-12 19:00:01 +03001451 kvfree(vs);
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001452err_vs:
1453 return r;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001454}
1455
1456static int vhost_scsi_release(struct inode *inode, struct file *f)
1457{
Asias Hec7289312013-05-06 16:38:26 +08001458 struct vhost_scsi *vs = f->private_data;
Asias He67e18cf2013-02-05 12:31:57 +08001459 struct vhost_scsi_target t;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001460
Asias Hec7289312013-05-06 16:38:26 +08001461 mutex_lock(&vs->dev.mutex);
1462 memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
1463 mutex_unlock(&vs->dev.mutex);
1464 vhost_scsi_clear_endpoint(vs, &t);
1465 vhost_dev_stop(&vs->dev);
1466 vhost_dev_cleanup(&vs->dev, false);
Asias Hea6c9af82013-04-25 15:35:21 +08001467 /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
Asias Hec7289312013-05-06 16:38:26 +08001468 vhost_scsi_flush(vs);
1469 kfree(vs->dev.vqs);
Michael S. Tsirkin684044412014-06-12 19:00:01 +03001470 kvfree(vs);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001471 return 0;
1472}
1473
Asias He683bd962013-05-06 16:38:27 +08001474static long
1475vhost_scsi_ioctl(struct file *f,
1476 unsigned int ioctl,
1477 unsigned long arg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001478{
1479 struct vhost_scsi *vs = f->private_data;
1480 struct vhost_scsi_target backend;
1481 void __user *argp = (void __user *)arg;
1482 u64 __user *featurep = argp;
Asias He11c634182013-04-25 15:35:22 +08001483 u32 __user *eventsp = argp;
1484 u32 events_missed;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001485 u64 features;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001486 int r, abi_version = VHOST_SCSI_ABI_VERSION;
Asias He3ab2e422013-04-27 11:16:48 +08001487 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001488
1489 switch (ioctl) {
1490 case VHOST_SCSI_SET_ENDPOINT:
1491 if (copy_from_user(&backend, argp, sizeof backend))
1492 return -EFAULT;
Michael S. Tsirkin6de71452012-08-18 15:44:09 -07001493 if (backend.reserved != 0)
1494 return -EOPNOTSUPP;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001495
1496 return vhost_scsi_set_endpoint(vs, &backend);
1497 case VHOST_SCSI_CLEAR_ENDPOINT:
1498 if (copy_from_user(&backend, argp, sizeof backend))
1499 return -EFAULT;
Michael S. Tsirkin6de71452012-08-18 15:44:09 -07001500 if (backend.reserved != 0)
1501 return -EOPNOTSUPP;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001502
1503 return vhost_scsi_clear_endpoint(vs, &backend);
1504 case VHOST_SCSI_GET_ABI_VERSION:
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001505 if (copy_to_user(argp, &abi_version, sizeof abi_version))
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001506 return -EFAULT;
1507 return 0;
Asias He11c634182013-04-25 15:35:22 +08001508 case VHOST_SCSI_SET_EVENTS_MISSED:
1509 if (get_user(events_missed, eventsp))
1510 return -EFAULT;
1511 mutex_lock(&vq->mutex);
1512 vs->vs_events_missed = events_missed;
1513 mutex_unlock(&vq->mutex);
1514 return 0;
1515 case VHOST_SCSI_GET_EVENTS_MISSED:
1516 mutex_lock(&vq->mutex);
1517 events_missed = vs->vs_events_missed;
1518 mutex_unlock(&vq->mutex);
1519 if (put_user(events_missed, eventsp))
1520 return -EFAULT;
1521 return 0;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001522 case VHOST_GET_FEATURES:
Nicholas Bellinger5dade712013-03-27 17:23:41 -07001523 features = VHOST_SCSI_FEATURES;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001524 if (copy_to_user(featurep, &features, sizeof features))
1525 return -EFAULT;
1526 return 0;
1527 case VHOST_SET_FEATURES:
1528 if (copy_from_user(&features, featurep, sizeof features))
1529 return -EFAULT;
1530 return vhost_scsi_set_features(vs, features);
1531 default:
1532 mutex_lock(&vs->dev.mutex);
Michael S. Tsirkin935cdee2012-12-06 14:03:34 +02001533 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
1534 /* TODO: flush backend after dev ioctl. */
1535 if (r == -ENOIOCTLCMD)
1536 r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001537 mutex_unlock(&vs->dev.mutex);
1538 return r;
1539 }
1540}
1541
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001542#ifdef CONFIG_COMPAT
1543static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
1544 unsigned long arg)
1545{
1546 return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
1547}
1548#endif
1549
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001550static const struct file_operations vhost_scsi_fops = {
1551 .owner = THIS_MODULE,
1552 .release = vhost_scsi_release,
1553 .unlocked_ioctl = vhost_scsi_ioctl,
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001554#ifdef CONFIG_COMPAT
1555 .compat_ioctl = vhost_scsi_compat_ioctl,
1556#endif
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001557 .open = vhost_scsi_open,
1558 .llseek = noop_llseek,
1559};
1560
1561static struct miscdevice vhost_scsi_misc = {
1562 MISC_DYNAMIC_MINOR,
1563 "vhost-scsi",
1564 &vhost_scsi_fops,
1565};
1566
1567static int __init vhost_scsi_register(void)
1568{
1569 return misc_register(&vhost_scsi_misc);
1570}
1571
Greg Kroah-Hartmanf368ed62015-07-30 15:59:57 -07001572static void vhost_scsi_deregister(void)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001573{
Greg Kroah-Hartmanf368ed62015-07-30 15:59:57 -07001574 misc_deregister(&vhost_scsi_misc);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001575}
1576
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001577static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001578{
1579 switch (tport->tport_proto_id) {
1580 case SCSI_PROTOCOL_SAS:
1581 return "SAS";
1582 case SCSI_PROTOCOL_FCP:
1583 return "FCP";
1584 case SCSI_PROTOCOL_ISCSI:
1585 return "iSCSI";
1586 default:
1587 break;
1588 }
1589
1590 return "Unknown";
1591}
1592
Asias He683bd962013-05-06 16:38:27 +08001593static void
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001594vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg,
Asias He683bd962013-05-06 16:38:27 +08001595 struct se_lun *lun, bool plug)
Asias Hea6c9af82013-04-25 15:35:21 +08001596{
1597
1598 struct vhost_scsi *vs = tpg->vhost_scsi;
1599 struct vhost_virtqueue *vq;
1600 u32 reason;
1601
1602 if (!vs)
1603 return;
1604
1605 mutex_lock(&vs->dev.mutex);
Asias Hea6c9af82013-04-25 15:35:21 +08001606
1607 if (plug)
1608 reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
1609 else
1610 reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
1611
Asias He3ab2e422013-04-27 11:16:48 +08001612 vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +08001613 mutex_lock(&vq->mutex);
Michael S. Tsirkinea16c512014-06-05 15:20:23 +03001614 if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG))
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001615 vhost_scsi_send_evt(vs, tpg, lun,
Michael S. Tsirkinea16c512014-06-05 15:20:23 +03001616 VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
Asias Hea6c9af82013-04-25 15:35:21 +08001617 mutex_unlock(&vq->mutex);
1618 mutex_unlock(&vs->dev.mutex);
1619}
1620
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001621static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
Asias Hea6c9af82013-04-25 15:35:21 +08001622{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001623 vhost_scsi_do_plug(tpg, lun, true);
Asias Hea6c9af82013-04-25 15:35:21 +08001624}
1625
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001626static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
Asias Hea6c9af82013-04-25 15:35:21 +08001627{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001628 vhost_scsi_do_plug(tpg, lun, false);
Asias Hea6c9af82013-04-25 15:35:21 +08001629}
1630
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001631static int vhost_scsi_port_link(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +08001632 struct se_lun *lun)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001633{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001634 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1635 struct vhost_scsi_tpg, se_tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001636
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001637 mutex_lock(&vhost_scsi_mutex);
Asias Hea6c9af82013-04-25 15:35:21 +08001638
Asias He98718312013-05-06 16:38:28 +08001639 mutex_lock(&tpg->tv_tpg_mutex);
1640 tpg->tv_tpg_port_count++;
1641 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001642
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001643 vhost_scsi_hotplug(tpg, lun);
Asias Hea6c9af82013-04-25 15:35:21 +08001644
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001645 mutex_unlock(&vhost_scsi_mutex);
Asias Hea6c9af82013-04-25 15:35:21 +08001646
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001647 return 0;
1648}
1649
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001650static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +08001651 struct se_lun *lun)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001652{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001653 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1654 struct vhost_scsi_tpg, se_tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001655
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001656 mutex_lock(&vhost_scsi_mutex);
Asias Hea6c9af82013-04-25 15:35:21 +08001657
Asias He98718312013-05-06 16:38:28 +08001658 mutex_lock(&tpg->tv_tpg_mutex);
1659 tpg->tv_tpg_port_count--;
1660 mutex_unlock(&tpg->tv_tpg_mutex);
Asias Hea6c9af82013-04-25 15:35:21 +08001661
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001662 vhost_scsi_hotunplug(tpg, lun);
Asias Hea6c9af82013-04-25 15:35:21 +08001663
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001664 mutex_unlock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001665}
1666
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001667static void vhost_scsi_free_cmd_map_res(struct vhost_scsi_nexus *nexus,
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001668 struct se_session *se_sess)
1669{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001670 struct vhost_scsi_cmd *tv_cmd;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001671 unsigned int i;
1672
1673 if (!se_sess->sess_cmd_map)
1674 return;
1675
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001676 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1677 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001678
1679 kfree(tv_cmd->tvc_sgl);
Nicholas Bellingerb1935f62014-02-22 18:08:24 -08001680 kfree(tv_cmd->tvc_prot_sgl);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001681 kfree(tv_cmd->tvc_upages);
1682 }
1683}
1684
Christoph Hellwig2eafd722015-10-03 15:32:55 +02001685static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store(
1686 struct config_item *item, const char *page, size_t count)
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -07001687{
Christoph Hellwig2eafd722015-10-03 15:32:55 +02001688 struct se_portal_group *se_tpg = attrib_to_tpg(item);
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -07001689 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1690 struct vhost_scsi_tpg, se_tpg);
1691 unsigned long val;
1692 int ret = kstrtoul(page, 0, &val);
1693
1694 if (ret) {
1695 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
1696 return ret;
1697 }
1698 if (val != 0 && val != 1 && val != 3) {
1699 pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val);
1700 return -EINVAL;
1701 }
1702 tpg->tv_fabric_prot_type = val;
1703
1704 return count;
1705}
1706
Christoph Hellwig2eafd722015-10-03 15:32:55 +02001707static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show(
1708 struct config_item *item, char *page)
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -07001709{
Christoph Hellwig2eafd722015-10-03 15:32:55 +02001710 struct se_portal_group *se_tpg = attrib_to_tpg(item);
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -07001711 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1712 struct vhost_scsi_tpg, se_tpg);
1713
1714 return sprintf(page, "%d\n", tpg->tv_fabric_prot_type);
1715}
Christoph Hellwig2eafd722015-10-03 15:32:55 +02001716
1717CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type);
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -07001718
1719static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = {
Christoph Hellwig2eafd722015-10-03 15:32:55 +02001720 &vhost_scsi_tpg_attrib_attr_fabric_prot_type,
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -07001721 NULL,
1722};
1723
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001724static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
Asias He683bd962013-05-06 16:38:27 +08001725 const char *name)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001726{
1727 struct se_portal_group *se_tpg;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001728 struct se_session *se_sess;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001729 struct vhost_scsi_nexus *tv_nexus;
1730 struct vhost_scsi_cmd *tv_cmd;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001731 unsigned int i;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001732
Asias He98718312013-05-06 16:38:28 +08001733 mutex_lock(&tpg->tv_tpg_mutex);
1734 if (tpg->tpg_nexus) {
1735 mutex_unlock(&tpg->tv_tpg_mutex);
1736 pr_debug("tpg->tpg_nexus already exists\n");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001737 return -EEXIST;
1738 }
Asias He98718312013-05-06 16:38:28 +08001739 se_tpg = &tpg->se_tpg;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001740
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001741 tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001742 if (!tv_nexus) {
Asias He98718312013-05-06 16:38:28 +08001743 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001744 pr_err("Unable to allocate struct vhost_scsi_nexus\n");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001745 return -ENOMEM;
1746 }
1747 /*
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -07001748 * Initialize the struct se_session pointer and setup tagpool
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001749 * for struct vhost_scsi_cmd descriptors
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001750 */
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -07001751 tv_nexus->tvn_se_sess = transport_init_session_tags(
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001752 VHOST_SCSI_DEFAULT_TAGS,
1753 sizeof(struct vhost_scsi_cmd),
Nicholas Bellinger95e7c432014-02-22 18:22:31 -08001754 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001755 if (IS_ERR(tv_nexus->tvn_se_sess)) {
Asias He98718312013-05-06 16:38:28 +08001756 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001757 kfree(tv_nexus);
1758 return -ENOMEM;
1759 }
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001760 se_sess = tv_nexus->tvn_se_sess;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001761 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1762 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001763
1764 tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001765 VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001766 if (!tv_cmd->tvc_sgl) {
1767 mutex_unlock(&tpg->tv_tpg_mutex);
1768 pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
1769 goto out;
1770 }
1771
1772 tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001773 VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001774 if (!tv_cmd->tvc_upages) {
1775 mutex_unlock(&tpg->tv_tpg_mutex);
1776 pr_err("Unable to allocate tv_cmd->tvc_upages\n");
1777 goto out;
1778 }
Nicholas Bellingerb1935f62014-02-22 18:08:24 -08001779
1780 tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001781 VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL);
Nicholas Bellingerb1935f62014-02-22 18:08:24 -08001782 if (!tv_cmd->tvc_prot_sgl) {
1783 mutex_unlock(&tpg->tv_tpg_mutex);
1784 pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
1785 goto out;
1786 }
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001787 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001788 /*
1789 * Since we are running in 'demo mode' this call with generate a
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001790 * struct se_node_acl for the vhost_scsi struct se_portal_group with
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001791 * the SCSI Initiator port name of the passed configfs group 'name'.
1792 */
1793 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1794 se_tpg, (unsigned char *)name);
1795 if (!tv_nexus->tvn_se_sess->se_node_acl) {
Asias He98718312013-05-06 16:38:28 +08001796 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001797 pr_debug("core_tpg_check_initiator_node_acl() failed"
1798 " for %s\n", name);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001799 goto out;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001800 }
1801 /*
Bart Van Assche2f450cc2015-02-12 11:48:49 +01001802 * Now register the TCM vhost virtual I_T Nexus as active.
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001803 */
Bart Van Assche2f450cc2015-02-12 11:48:49 +01001804 transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001805 tv_nexus->tvn_se_sess, tv_nexus);
Asias He98718312013-05-06 16:38:28 +08001806 tpg->tpg_nexus = tv_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001807
Asias He98718312013-05-06 16:38:28 +08001808 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001809 return 0;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001810
1811out:
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001812 vhost_scsi_free_cmd_map_res(tv_nexus, se_sess);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001813 transport_free_session(se_sess);
1814 kfree(tv_nexus);
1815 return -ENOMEM;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001816}
1817
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001818static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001819{
1820 struct se_session *se_sess;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001821 struct vhost_scsi_nexus *tv_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001822
1823 mutex_lock(&tpg->tv_tpg_mutex);
1824 tv_nexus = tpg->tpg_nexus;
1825 if (!tv_nexus) {
1826 mutex_unlock(&tpg->tv_tpg_mutex);
1827 return -ENODEV;
1828 }
1829
1830 se_sess = tv_nexus->tvn_se_sess;
1831 if (!se_sess) {
1832 mutex_unlock(&tpg->tv_tpg_mutex);
1833 return -ENODEV;
1834 }
1835
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001836 if (tpg->tv_tpg_port_count != 0) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001837 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001838 pr_err("Unable to remove TCM_vhost I_T Nexus with"
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001839 " active TPG port count: %d\n",
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001840 tpg->tv_tpg_port_count);
1841 return -EBUSY;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001842 }
1843
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001844 if (tpg->tv_tpg_vhost_count != 0) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001845 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001846 pr_err("Unable to remove TCM_vhost I_T Nexus with"
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001847 " active TPG vhost count: %d\n",
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001848 tpg->tv_tpg_vhost_count);
1849 return -EBUSY;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001850 }
1851
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001852 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001853 " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport),
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001854 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07001855
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001856 vhost_scsi_free_cmd_map_res(tv_nexus, se_sess);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001857 /*
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001858 * Release the SCSI I_T Nexus to the emulated vhost Target Port
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001859 */
1860 transport_deregister_session(tv_nexus->tvn_se_sess);
1861 tpg->tpg_nexus = NULL;
1862 mutex_unlock(&tpg->tv_tpg_mutex);
1863
1864 kfree(tv_nexus);
1865 return 0;
1866}
1867
Christoph Hellwig2eafd722015-10-03 15:32:55 +02001868static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001869{
Christoph Hellwig2eafd722015-10-03 15:32:55 +02001870 struct se_portal_group *se_tpg = to_tpg(item);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001871 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1872 struct vhost_scsi_tpg, se_tpg);
1873 struct vhost_scsi_nexus *tv_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001874 ssize_t ret;
1875
Asias He98718312013-05-06 16:38:28 +08001876 mutex_lock(&tpg->tv_tpg_mutex);
1877 tv_nexus = tpg->tpg_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001878 if (!tv_nexus) {
Asias He98718312013-05-06 16:38:28 +08001879 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001880 return -ENODEV;
1881 }
1882 ret = snprintf(page, PAGE_SIZE, "%s\n",
1883 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
Asias He98718312013-05-06 16:38:28 +08001884 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001885
1886 return ret;
1887}
1888
Christoph Hellwig2eafd722015-10-03 15:32:55 +02001889static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item,
1890 const char *page, size_t count)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001891{
Christoph Hellwig2eafd722015-10-03 15:32:55 +02001892 struct se_portal_group *se_tpg = to_tpg(item);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001893 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1894 struct vhost_scsi_tpg, se_tpg);
1895 struct vhost_scsi_tport *tport_wwn = tpg->tport;
1896 unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001897 int ret;
1898 /*
1899 * Shutdown the active I_T nexus if 'NULL' is passed..
1900 */
1901 if (!strncmp(page, "NULL", 4)) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001902 ret = vhost_scsi_drop_nexus(tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001903 return (!ret) ? count : ret;
1904 }
1905 /*
1906 * Otherwise make sure the passed virtual Initiator port WWN matches
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001907 * the fabric protocol_id set in vhost_scsi_make_tport(), and call
1908 * vhost_scsi_make_nexus().
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001909 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001910 if (strlen(page) >= VHOST_SCSI_NAMELEN) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001911 pr_err("Emulated NAA Sas Address: %s, exceeds"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001912 " max: %d\n", page, VHOST_SCSI_NAMELEN);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001913 return -EINVAL;
1914 }
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001915 snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001916
1917 ptr = strstr(i_port, "naa.");
1918 if (ptr) {
1919 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1920 pr_err("Passed SAS Initiator Port %s does not"
1921 " match target port protoid: %s\n", i_port,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001922 vhost_scsi_dump_proto_id(tport_wwn));
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001923 return -EINVAL;
1924 }
1925 port_ptr = &i_port[0];
1926 goto check_newline;
1927 }
1928 ptr = strstr(i_port, "fc.");
1929 if (ptr) {
1930 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1931 pr_err("Passed FCP Initiator Port %s does not"
1932 " match target port protoid: %s\n", i_port,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001933 vhost_scsi_dump_proto_id(tport_wwn));
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001934 return -EINVAL;
1935 }
1936 port_ptr = &i_port[3]; /* Skip over "fc." */
1937 goto check_newline;
1938 }
1939 ptr = strstr(i_port, "iqn.");
1940 if (ptr) {
1941 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1942 pr_err("Passed iSCSI Initiator Port %s does not"
1943 " match target port protoid: %s\n", i_port,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001944 vhost_scsi_dump_proto_id(tport_wwn));
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001945 return -EINVAL;
1946 }
1947 port_ptr = &i_port[0];
1948 goto check_newline;
1949 }
1950 pr_err("Unable to locate prefix for emulated Initiator Port:"
1951 " %s\n", i_port);
1952 return -EINVAL;
1953 /*
1954 * Clear any trailing newline for the NAA WWN
1955 */
1956check_newline:
1957 if (i_port[strlen(i_port)-1] == '\n')
1958 i_port[strlen(i_port)-1] = '\0';
1959
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001960 ret = vhost_scsi_make_nexus(tpg, port_ptr);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001961 if (ret < 0)
1962 return ret;
1963
1964 return count;
1965}
1966
Christoph Hellwig2eafd722015-10-03 15:32:55 +02001967CONFIGFS_ATTR(vhost_scsi_tpg_, nexus);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001968
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001969static struct configfs_attribute *vhost_scsi_tpg_attrs[] = {
Christoph Hellwig2eafd722015-10-03 15:32:55 +02001970 &vhost_scsi_tpg_attr_nexus,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001971 NULL,
1972};
1973
Asias He683bd962013-05-06 16:38:27 +08001974static struct se_portal_group *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001975vhost_scsi_make_tpg(struct se_wwn *wwn,
Asias He683bd962013-05-06 16:38:27 +08001976 struct config_group *group,
1977 const char *name)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001978{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001979 struct vhost_scsi_tport *tport = container_of(wwn,
1980 struct vhost_scsi_tport, tport_wwn);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001981
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001982 struct vhost_scsi_tpg *tpg;
Dan Carpenter59c816c2015-02-05 10:37:33 +03001983 u16 tpgt;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001984 int ret;
1985
1986 if (strstr(name, "tpgt_") != name)
1987 return ERR_PTR(-EINVAL);
Dan Carpenter59c816c2015-02-05 10:37:33 +03001988 if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001989 return ERR_PTR(-EINVAL);
1990
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001991 tpg = kzalloc(sizeof(struct vhost_scsi_tpg), GFP_KERNEL);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001992 if (!tpg) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001993 pr_err("Unable to allocate struct vhost_scsi_tpg");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001994 return ERR_PTR(-ENOMEM);
1995 }
1996 mutex_init(&tpg->tv_tpg_mutex);
1997 INIT_LIST_HEAD(&tpg->tv_tpg_list);
1998 tpg->tport = tport;
1999 tpg->tport_tpgt = tpgt;
2000
Nicholas Bellingerbc0c94b2015-05-20 21:48:03 -07002001 ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002002 if (ret < 0) {
2003 kfree(tpg);
2004 return NULL;
2005 }
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002006 mutex_lock(&vhost_scsi_mutex);
2007 list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list);
2008 mutex_unlock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002009
2010 return &tpg->se_tpg;
2011}
2012
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002013static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002014{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002015 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2016 struct vhost_scsi_tpg, se_tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002017
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002018 mutex_lock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002019 list_del(&tpg->tv_tpg_list);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002020 mutex_unlock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002021 /*
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002022 * Release the virtual I_T Nexus for this vhost TPG
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002023 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002024 vhost_scsi_drop_nexus(tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002025 /*
2026 * Deregister the se_tpg from TCM..
2027 */
2028 core_tpg_deregister(se_tpg);
2029 kfree(tpg);
2030}
2031
Asias He683bd962013-05-06 16:38:27 +08002032static struct se_wwn *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002033vhost_scsi_make_tport(struct target_fabric_configfs *tf,
Asias He683bd962013-05-06 16:38:27 +08002034 struct config_group *group,
2035 const char *name)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002036{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002037 struct vhost_scsi_tport *tport;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002038 char *ptr;
2039 u64 wwpn = 0;
2040 int off = 0;
2041
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002042 /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002043 return ERR_PTR(-EINVAL); */
2044
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002045 tport = kzalloc(sizeof(struct vhost_scsi_tport), GFP_KERNEL);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002046 if (!tport) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002047 pr_err("Unable to allocate struct vhost_scsi_tport");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002048 return ERR_PTR(-ENOMEM);
2049 }
2050 tport->tport_wwpn = wwpn;
2051 /*
2052 * Determine the emulated Protocol Identifier and Target Port Name
2053 * based on the incoming configfs directory name.
2054 */
2055 ptr = strstr(name, "naa.");
2056 if (ptr) {
2057 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
2058 goto check_len;
2059 }
2060 ptr = strstr(name, "fc.");
2061 if (ptr) {
2062 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
2063 off = 3; /* Skip over "fc." */
2064 goto check_len;
2065 }
2066 ptr = strstr(name, "iqn.");
2067 if (ptr) {
2068 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
2069 goto check_len;
2070 }
2071
2072 pr_err("Unable to locate prefix for emulated Target Port:"
2073 " %s\n", name);
2074 kfree(tport);
2075 return ERR_PTR(-EINVAL);
2076
2077check_len:
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002078 if (strlen(name) >= VHOST_SCSI_NAMELEN) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002079 pr_err("Emulated %s Address: %s, exceeds"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002080 " max: %d\n", name, vhost_scsi_dump_proto_id(tport),
2081 VHOST_SCSI_NAMELEN);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002082 kfree(tport);
2083 return ERR_PTR(-EINVAL);
2084 }
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002085 snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002086
2087 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002088 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002089
2090 return &tport->tport_wwn;
2091}
2092
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002093static void vhost_scsi_drop_tport(struct se_wwn *wwn)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002094{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002095 struct vhost_scsi_tport *tport = container_of(wwn,
2096 struct vhost_scsi_tport, tport_wwn);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002097
2098 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002099 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport),
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002100 tport->tport_name);
2101
2102 kfree(tport);
2103}
2104
Asias He683bd962013-05-06 16:38:27 +08002105static ssize_t
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002106vhost_scsi_wwn_version_show(struct config_item *item, char *page)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002107{
2108 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002109 "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002110 utsname()->machine);
2111}
2112
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002113CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002114
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002115static struct configfs_attribute *vhost_scsi_wwn_attrs[] = {
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002116 &vhost_scsi_wwn_attr_version,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002117 NULL,
2118};
2119
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002120static struct target_core_fabric_ops vhost_scsi_ops = {
Christoph Hellwig9ac89282015-04-08 20:01:35 +02002121 .module = THIS_MODULE,
2122 .name = "vhost",
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002123 .get_fabric_name = vhost_scsi_get_fabric_name,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002124 .tpg_get_wwn = vhost_scsi_get_fabric_wwn,
2125 .tpg_get_tag = vhost_scsi_get_tpgt,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002126 .tpg_check_demo_mode = vhost_scsi_check_true,
2127 .tpg_check_demo_mode_cache = vhost_scsi_check_true,
2128 .tpg_check_demo_mode_write_protect = vhost_scsi_check_false,
2129 .tpg_check_prod_mode_write_protect = vhost_scsi_check_false,
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -07002130 .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002131 .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index,
2132 .release_cmd = vhost_scsi_release_cmd,
Nicholas Bellinger084ed452013-06-06 02:20:41 -07002133 .check_stop_free = vhost_scsi_check_stop_free,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002134 .shutdown_session = vhost_scsi_shutdown_session,
2135 .close_session = vhost_scsi_close_session,
2136 .sess_get_index = vhost_scsi_sess_get_index,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002137 .sess_get_initiator_sid = NULL,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002138 .write_pending = vhost_scsi_write_pending,
2139 .write_pending_status = vhost_scsi_write_pending_status,
2140 .set_default_node_attributes = vhost_scsi_set_default_node_attrs,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002141 .get_cmd_state = vhost_scsi_get_cmd_state,
2142 .queue_data_in = vhost_scsi_queue_data_in,
2143 .queue_status = vhost_scsi_queue_status,
2144 .queue_tm_rsp = vhost_scsi_queue_tm_rsp,
2145 .aborted_task = vhost_scsi_aborted_task,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002146 /*
2147 * Setup callers for generic logic in target_core_fabric_configfs.c
2148 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002149 .fabric_make_wwn = vhost_scsi_make_tport,
2150 .fabric_drop_wwn = vhost_scsi_drop_tport,
2151 .fabric_make_tpg = vhost_scsi_make_tpg,
2152 .fabric_drop_tpg = vhost_scsi_drop_tpg,
2153 .fabric_post_link = vhost_scsi_port_link,
2154 .fabric_pre_unlink = vhost_scsi_port_unlink,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002155
Christoph Hellwig9ac89282015-04-08 20:01:35 +02002156 .tfc_wwn_attrs = vhost_scsi_wwn_attrs,
2157 .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs,
2158 .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002159};
2160
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002161static int __init vhost_scsi_init(void)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002162{
2163 int ret = -ENOMEM;
Christoph Hellwig9ac89282015-04-08 20:01:35 +02002164
2165 pr_debug("TCM_VHOST fabric module %s on %s/%s"
2166 " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2167 utsname()->machine);
2168
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002169 /*
2170 * Use our own dedicated workqueue for submitting I/O into
2171 * target core to avoid contention within system_wq.
2172 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002173 vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0);
2174 if (!vhost_scsi_workqueue)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002175 goto out;
2176
2177 ret = vhost_scsi_register();
2178 if (ret < 0)
2179 goto out_destroy_workqueue;
2180
Christoph Hellwig9ac89282015-04-08 20:01:35 +02002181 ret = target_register_template(&vhost_scsi_ops);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002182 if (ret < 0)
2183 goto out_vhost_scsi_deregister;
2184
2185 return 0;
2186
2187out_vhost_scsi_deregister:
2188 vhost_scsi_deregister();
2189out_destroy_workqueue:
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002190 destroy_workqueue(vhost_scsi_workqueue);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002191out:
2192 return ret;
2193};
2194
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002195static void vhost_scsi_exit(void)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002196{
Christoph Hellwig9ac89282015-04-08 20:01:35 +02002197 target_unregister_template(&vhost_scsi_ops);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002198 vhost_scsi_deregister();
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002199 destroy_workqueue(vhost_scsi_workqueue);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002200};
2201
Michael S. Tsirkin181c04a2013-05-02 03:52:59 +03002202MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2203MODULE_ALIAS("tcm_vhost");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002204MODULE_LICENSE("GPL");
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002205module_init(vhost_scsi_init);
2206module_exit(vhost_scsi_exit);