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Cai Huoqing23b228c2021-08-21 20:33:20 +08001// SPDX-License-Identifier: GPL-2.0+
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002/*******************************************************************************
3 * Vhost kernel TCM fabric driver for virtio SCSI initiators
4 *
Nicholas Bellinger4c762512013-09-05 15:29:12 -07005 * (C) Copyright 2010-2013 Datera, Inc.
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07006 * (C) Copyright 2010-2012 IBM Corp.
7 *
Nicholas Bellinger4c762512013-09-05 15:29:12 -07008 * Authors: Nicholas A. Bellinger <nab@daterainc.com>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07009 * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070010 ****************************************************************************/
11
12#include <linux/module.h>
13#include <linux/moduleparam.h>
14#include <generated/utsrelease.h>
15#include <linux/utsname.h>
16#include <linux/init.h>
17#include <linux/slab.h>
18#include <linux/kthread.h>
19#include <linux/types.h>
20#include <linux/string.h>
21#include <linux/configfs.h>
22#include <linux/ctype.h>
23#include <linux/compat.h>
24#include <linux/eventfd.h>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070025#include <linux/fs.h>
David S. Miller5538d292015-05-28 11:35:41 -070026#include <linux/vmalloc.h>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070027#include <linux/miscdevice.h>
Mike Christie5ced58b2023-07-09 15:28:58 -050028#include <linux/blk_types.h>
29#include <linux/bio.h>
Al Viro5f60d5f2024-10-01 15:35:57 -040030#include <linux/unaligned.h>
Bart Van Asscheba929992015-05-08 10:11:12 +020031#include <scsi/scsi_common.h>
32#include <scsi/scsi_proto.h>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070033#include <target/target_core_base.h>
34#include <target/target_core_fabric.h>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070035#include <linux/vhost.h>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070036#include <linux/virtio_scsi.h>
Asias He9d6064a2013-01-06 14:36:13 +080037#include <linux/llist.h>
Asias He1b7f3902013-02-06 13:20:59 +080038#include <linux/bitmap.h>
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070039
Nicholas Bellinger057cbf42012-07-18 14:31:32 -070040#include "vhost.h"
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030041
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -080042#define VHOST_SCSI_VERSION "v0.1"
43#define VHOST_SCSI_NAMELEN 256
44#define VHOST_SCSI_MAX_CDB_SIZE 32
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -080045#define VHOST_SCSI_PREALLOC_SGLS 2048
46#define VHOST_SCSI_PREALLOC_UPAGES 2048
Greg Edwards864d39d2018-08-08 13:29:55 -060047#define VHOST_SCSI_PREALLOC_PROT_SGLS 2048
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030048
Jason Wange82b9b02019-05-17 00:29:49 -040049/* Max number of requests before requeueing the job.
50 * Using this limit prevents one virtqueue from starving others with
51 * request.
52 */
53#define VHOST_SCSI_WEIGHT 256
54
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030055struct vhost_scsi_inflight {
56 /* Wait for the flush operation to finish */
57 struct completion comp;
58 /* Refcount for the inflight reqs */
59 struct kref kref;
60};
61
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -080062struct vhost_scsi_cmd {
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030063 /* Descriptor from vhost_get_vq_desc() for virt_queue segment */
64 int tvc_vq_desc;
65 /* virtio-scsi initiator task attribute */
66 int tvc_task_attr;
Nicholas Bellinger79c141412015-01-27 13:13:12 -080067 /* virtio-scsi response incoming iovecs */
68 int tvc_in_iovs;
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030069 /* virtio-scsi initiator data direction */
70 enum dma_data_direction tvc_data_direction;
71 /* Expected data transfer length from virtio-scsi header */
72 u32 tvc_exp_data_len;
73 /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
74 u64 tvc_tag;
75 /* The number of scatterlists associated with this cmd */
76 u32 tvc_sgl_count;
Nicholas Bellingere31885d2014-02-22 18:34:43 -080077 u32 tvc_prot_sgl_count;
Mike Christie6ec29cb2021-02-27 10:59:58 -060078 /* Saved unpacked SCSI LUN for vhost_scsi_target_queue_cmd() */
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030079 u32 tvc_lun;
Mike Christie5ced58b2023-07-09 15:28:58 -050080 u32 copied_iov:1;
81 const void *saved_iter_addr;
82 struct iov_iter saved_iter;
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030083 /* Pointer to the SGL formatted memory from virtio-scsi */
84 struct scatterlist *tvc_sgl;
Nicholas Bellingerb1935f62014-02-22 18:08:24 -080085 struct scatterlist *tvc_prot_sgl;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -070086 struct page **tvc_upages;
Nicholas Bellinger79c141412015-01-27 13:13:12 -080087 /* Pointer to response header iovec */
Jason Wang6dd88fd2023-01-19 15:36:47 +080088 struct iovec *tvc_resp_iov;
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030089 /* Pointer to vhost_scsi for our device */
90 struct vhost_scsi *tvc_vhost;
91 /* Pointer to vhost_virtqueue for the cmd */
92 struct vhost_virtqueue *tvc_vq;
93 /* Pointer to vhost nexus memory */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -080094 struct vhost_scsi_nexus *tvc_nexus;
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030095 /* The TCM I/O descriptor that is accessed via container_of() */
96 struct se_cmd tvc_se_cmd;
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030097 /* Copy of the incoming SCSI command descriptor block (CDB) */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -080098 unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE];
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +030099 /* Sense buffer that will be mapped into outgoing status */
100 unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
101 /* Completed commands list, serviced from vhost worker thread */
102 struct llist_node tvc_completion_list;
103 /* Used to track inflight cmd */
104 struct vhost_scsi_inflight *inflight;
105};
106
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800107struct vhost_scsi_nexus {
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300108 /* Pointer to TCM session for I_T Nexus */
109 struct se_session *tvn_se_sess;
110};
111
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800112struct vhost_scsi_tpg {
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300113 /* Vhost port target portal group tag for TCM */
114 u16 tport_tpgt;
115 /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
116 int tv_tpg_port_count;
117 /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
118 int tv_tpg_vhost_count;
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -0700119 /* Used for enabling T10-PI with legacy devices */
120 int tv_fabric_prot_type;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800121 /* list for vhost_scsi_list */
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300122 struct list_head tv_tpg_list;
123 /* Used to protect access for tpg_nexus */
124 struct mutex tv_tpg_mutex;
125 /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800126 struct vhost_scsi_nexus *tpg_nexus;
127 /* Pointer back to vhost_scsi_tport */
128 struct vhost_scsi_tport *tport;
129 /* Returned by vhost_scsi_make_tpg() */
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300130 struct se_portal_group se_tpg;
131 /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */
132 struct vhost_scsi *vhost_scsi;
133};
134
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800135struct vhost_scsi_tport {
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300136 /* SCSI protocol the tport is providing */
137 u8 tport_proto_id;
138 /* Binary World Wide unique Port Name for Vhost Target port */
139 u64 tport_wwpn;
140 /* ASCII formatted WWPN for Vhost Target port */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800141 char tport_name[VHOST_SCSI_NAMELEN];
142 /* Returned by vhost_scsi_make_tport() */
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300143 struct se_wwn tport_wwn;
144};
145
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800146struct vhost_scsi_evt {
Michael S. Tsirkin5012a3a2013-05-02 03:50:34 +0300147 /* event to be sent to guest */
148 struct virtio_scsi_event event;
149 /* event list, serviced from vhost worker thread */
150 struct llist_node list;
151};
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700152
Nicholas Bellinger101998f2012-07-30 13:30:00 -0700153enum {
154 VHOST_SCSI_VQ_CTL = 0,
155 VHOST_SCSI_VQ_EVT = 1,
156 VHOST_SCSI_VQ_IO = 2,
157};
158
Michael S. Tsirkine72fd722014-11-23 18:01:34 +0200159/* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */
Nicholas Bellinger5dade712013-03-27 17:23:41 -0700160enum {
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800161 VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
Michael S. Tsirkin4e9fa502015-09-09 22:24:56 +0300162 (1ULL << VIRTIO_SCSI_F_T10_PI)
Nicholas Bellinger5dade712013-03-27 17:23:41 -0700163};
164
Asias He1b7f3902013-02-06 13:20:59 +0800165#define VHOST_SCSI_MAX_TARGET 256
Mike Christief49c2222022-07-07 22:05:25 -0500166#define VHOST_SCSI_MAX_IO_VQ 1024
Asias Hea6c9af82013-04-25 15:35:21 +0800167#define VHOST_SCSI_MAX_EVENT 128
Asias He67e18cf2013-02-05 12:31:57 +0800168
Mike Christief49c2222022-07-07 22:05:25 -0500169static unsigned vhost_scsi_max_io_vqs = 128;
170module_param_named(max_io_vqs, vhost_scsi_max_io_vqs, uint, 0644);
171MODULE_PARM_DESC(max_io_vqs, "Set the max number of IO virtqueues a vhost scsi device can support. The default is 128. The max is 1024.");
172
Asias He3ab2e422013-04-27 11:16:48 +0800173struct vhost_scsi_virtqueue {
174 struct vhost_virtqueue vq;
Mike Christie48ae70d2023-06-26 18:22:59 -0500175 struct vhost_scsi *vs;
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;
Mike Christie25b98b62020-11-09 23:33:20 -0600187 struct vhost_scsi_cmd *scsi_cmds;
188 struct sbitmap scsi_tags;
189 int max_cmds;
Mike Christie48ae70d2023-06-26 18:22:59 -0500190
191 struct vhost_work completion_work;
192 struct llist_head completion_list;
Asias He3ab2e422013-04-27 11:16:48 +0800193};
194
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700195struct vhost_scsi {
Asias He67e18cf2013-02-05 12:31:57 +0800196 /* Protected by vhost_scsi->dev.mutex */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800197 struct vhost_scsi_tpg **vs_tpg;
Asias He67e18cf2013-02-05 12:31:57 +0800198 char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
Asias He67e18cf2013-02-05 12:31:57 +0800199
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700200 struct vhost_dev dev;
Mike Christief49c2222022-07-07 22:05:25 -0500201 struct vhost_scsi_virtqueue *vqs;
Mike Christief49c2222022-07-07 22:05:25 -0500202 struct vhost_scsi_inflight **old_inflight;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700203
Asias Hea6c9af82013-04-25 15:35:21 +0800204 struct vhost_work vs_event_work; /* evt injection work item */
205 struct llist_head vs_event_list; /* evt injection queue */
206
207 bool vs_events_missed; /* any missed events, protected by vq->mutex */
208 int vs_events_nr; /* num of pending events, protected by vq->mutex */
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700209};
210
Mike Christieefd838f2020-11-09 23:33:23 -0600211struct vhost_scsi_tmf {
212 struct vhost_work vwork;
Mike Christie59b701b2024-03-15 19:47:01 -0500213 struct work_struct flush_work;
Mike Christieefd838f2020-11-09 23:33:23 -0600214 struct vhost_scsi *vhost;
215 struct vhost_scsi_virtqueue *svq;
Mike Christieefd838f2020-11-09 23:33:23 -0600216
217 struct se_cmd se_cmd;
Mike Christieb4fffc12020-11-20 09:50:59 -0600218 u8 scsi_resp;
Mike Christieefd838f2020-11-09 23:33:23 -0600219 struct vhost_scsi_inflight *inflight;
220 struct iovec resp_iov;
221 int in_iovs;
222 int vq_desc;
223};
224
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -0700225/*
226 * Context for processing request and control queue operations.
227 */
228struct vhost_scsi_ctx {
229 int head;
230 unsigned int out, in;
231 size_t req_size, rsp_size;
232 size_t out_size, in_size;
233 u8 *target, *lunp;
234 void *req;
235 struct iov_iter out_iter;
236};
237
Mike Christiebea273c2023-03-20 21:06:24 -0500238/*
239 * Global mutex to protect vhost_scsi TPG list for vhost IOCTLs and LIO
240 * configfs management operations.
241 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800242static DEFINE_MUTEX(vhost_scsi_mutex);
243static LIST_HEAD(vhost_scsi_list);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700244
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800245static void vhost_scsi_done_inflight(struct kref *kref)
Asias Hef2f0173d2013-04-27 11:16:49 +0800246{
247 struct vhost_scsi_inflight *inflight;
248
249 inflight = container_of(kref, struct vhost_scsi_inflight, kref);
250 complete(&inflight->comp);
251}
252
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800253static void vhost_scsi_init_inflight(struct vhost_scsi *vs,
Asias Hef2f0173d2013-04-27 11:16:49 +0800254 struct vhost_scsi_inflight *old_inflight[])
255{
256 struct vhost_scsi_inflight *new_inflight;
257 struct vhost_virtqueue *vq;
258 int idx, i;
259
Mike Christief49c2222022-07-07 22:05:25 -0500260 for (i = 0; i < vs->dev.nvqs; i++) {
Asias Hef2f0173d2013-04-27 11:16:49 +0800261 vq = &vs->vqs[i].vq;
262
263 mutex_lock(&vq->mutex);
264
265 /* store old infight */
266 idx = vs->vqs[i].inflight_idx;
267 if (old_inflight)
268 old_inflight[i] = &vs->vqs[i].inflights[idx];
269
270 /* setup new infight */
271 vs->vqs[i].inflight_idx = idx ^ 1;
272 new_inflight = &vs->vqs[i].inflights[idx ^ 1];
273 kref_init(&new_inflight->kref);
274 init_completion(&new_inflight->comp);
275
276 mutex_unlock(&vq->mutex);
277 }
278}
279
280static struct vhost_scsi_inflight *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800281vhost_scsi_get_inflight(struct vhost_virtqueue *vq)
Asias Hef2f0173d2013-04-27 11:16:49 +0800282{
283 struct vhost_scsi_inflight *inflight;
284 struct vhost_scsi_virtqueue *svq;
285
286 svq = container_of(vq, struct vhost_scsi_virtqueue, vq);
287 inflight = &svq->inflights[svq->inflight_idx];
288 kref_get(&inflight->kref);
289
290 return inflight;
291}
292
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800293static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight)
Asias Hef2f0173d2013-04-27 11:16:49 +0800294{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800295 kref_put(&inflight->kref, vhost_scsi_done_inflight);
Asias Hef2f0173d2013-04-27 11:16:49 +0800296}
297
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800298static int vhost_scsi_check_true(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700299{
300 return 1;
301}
302
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800303static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700304{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800305 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
306 struct vhost_scsi_tpg, se_tpg);
307 struct vhost_scsi_tport *tport = tpg->tport;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700308
309 return &tport->tport_name[0];
310}
311
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800312static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700313{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800314 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
315 struct vhost_scsi_tpg, se_tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700316 return tpg->tport_tpgt;
317}
318
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -0700319static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg)
320{
321 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
322 struct vhost_scsi_tpg, se_tpg);
323
324 return tpg->tv_fabric_prot_type;
325}
326
Mike Christie47a35652020-11-09 23:33:21 -0600327static void vhost_scsi_release_cmd_res(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700328{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800329 struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd,
330 struct vhost_scsi_cmd, tvc_se_cmd);
Mike Christie25b98b62020-11-09 23:33:20 -0600331 struct vhost_scsi_virtqueue *svq = container_of(tv_cmd->tvc_vq,
332 struct vhost_scsi_virtqueue, vq);
333 struct vhost_scsi_inflight *inflight = tv_cmd->inflight;
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800334 int i;
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700335
336 if (tv_cmd->tvc_sgl_count) {
Mike Christie5ced58b2023-07-09 15:28:58 -0500337 for (i = 0; i < tv_cmd->tvc_sgl_count; i++) {
338 if (tv_cmd->copied_iov)
339 __free_page(sg_page(&tv_cmd->tvc_sgl[i]));
340 else
341 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
342 }
343 kfree(tv_cmd->saved_iter_addr);
Michael S. Tsirkind3d665a2013-09-17 22:54:31 +0300344 }
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800345 if (tv_cmd->tvc_prot_sgl_count) {
346 for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++)
347 put_page(sg_page(&tv_cmd->tvc_prot_sgl[i]));
348 }
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700349
Mike Christie25b98b62020-11-09 23:33:20 -0600350 sbitmap_clear_bit(&svq->scsi_tags, se_cmd->map_tag);
351 vhost_scsi_put_inflight(inflight);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700352}
353
Mike Christieefd838f2020-11-09 23:33:23 -0600354static void vhost_scsi_release_tmf_res(struct vhost_scsi_tmf *tmf)
355{
Mike Christieefd838f2020-11-09 23:33:23 -0600356 struct vhost_scsi_inflight *inflight = tmf->inflight;
357
Mike Christie4c363c82023-03-20 21:06:19 -0500358 kfree(tmf);
Mike Christieefd838f2020-11-09 23:33:23 -0600359 vhost_scsi_put_inflight(inflight);
360}
361
Mike Christie1ecedde2024-03-15 19:47:00 -0500362static void vhost_scsi_drop_cmds(struct vhost_scsi_virtqueue *svq)
363{
364 struct vhost_scsi_cmd *cmd, *t;
365 struct llist_node *llnode;
366
367 llnode = llist_del_all(&svq->completion_list);
368 llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list)
369 vhost_scsi_release_cmd_res(&cmd->tvc_se_cmd);
370}
371
Mike Christie47a35652020-11-09 23:33:21 -0600372static void vhost_scsi_release_cmd(struct se_cmd *se_cmd)
373{
Mike Christieefd838f2020-11-09 23:33:23 -0600374 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) {
375 struct vhost_scsi_tmf *tmf = container_of(se_cmd,
376 struct vhost_scsi_tmf, se_cmd);
Mike Christie47a35652020-11-09 23:33:21 -0600377
Mike Christie59b701b2024-03-15 19:47:01 -0500378 schedule_work(&tmf->flush_work);
Mike Christieefd838f2020-11-09 23:33:23 -0600379 } else {
380 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
381 struct vhost_scsi_cmd, tvc_se_cmd);
Mike Christie48ae70d2023-06-26 18:22:59 -0500382 struct vhost_scsi_virtqueue *svq = container_of(cmd->tvc_vq,
383 struct vhost_scsi_virtqueue, vq);
Mike Christieefd838f2020-11-09 23:33:23 -0600384
Mike Christie48ae70d2023-06-26 18:22:59 -0500385 llist_add(&cmd->tvc_completion_list, &svq->completion_list);
Mike Christie1ecedde2024-03-15 19:47:00 -0500386 if (!vhost_vq_work_queue(&svq->vq, &svq->completion_work))
387 vhost_scsi_drop_cmds(svq);
Mike Christieefd838f2020-11-09 23:33:23 -0600388 }
Mike Christie47a35652020-11-09 23:33:21 -0600389}
390
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800391static int vhost_scsi_write_pending(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700392{
393 /* Go ahead and process the write immediately */
394 target_execute_cmd(se_cmd);
395 return 0;
396}
397
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800398static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700399{
Mike Christie47a35652020-11-09 23:33:21 -0600400 transport_generic_free_cmd(se_cmd, 0);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700401 return 0;
402}
403
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800404static int vhost_scsi_queue_status(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700405{
Mike Christie47a35652020-11-09 23:33:21 -0600406 transport_generic_free_cmd(se_cmd, 0);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700407 return 0;
408}
409
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800410static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700411{
Mike Christieefd838f2020-11-09 23:33:23 -0600412 struct vhost_scsi_tmf *tmf = container_of(se_cmd, struct vhost_scsi_tmf,
413 se_cmd);
414
Mike Christieb4fffc12020-11-20 09:50:59 -0600415 tmf->scsi_resp = se_cmd->se_tmr_req->response;
Mike Christieefd838f2020-11-09 23:33:23 -0600416 transport_generic_free_cmd(&tmf->se_cmd, 0);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700417}
418
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800419static void vhost_scsi_aborted_task(struct se_cmd *se_cmd)
Nicholas Bellinger131e6ab2014-03-22 14:55:56 -0700420{
421 return;
422}
423
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800424static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
Asias Hea6c9af82013-04-25 15:35:21 +0800425{
426 vs->vs_events_nr--;
427 kfree(evt);
428}
429
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800430static struct vhost_scsi_evt *
431vhost_scsi_allocate_evt(struct vhost_scsi *vs,
Asias He683bd962013-05-06 16:38:27 +0800432 u32 event, u32 reason)
Asias Hea6c9af82013-04-25 15:35:21 +0800433{
Asias He3ab2e422013-04-27 11:16:48 +0800434 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800435 struct vhost_scsi_evt *evt;
Asias Hea6c9af82013-04-25 15:35:21 +0800436
437 if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
438 vs->vs_events_missed = true;
439 return NULL;
440 }
441
442 evt = kzalloc(sizeof(*evt), GFP_KERNEL);
443 if (!evt) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800444 vq_err(vq, "Failed to allocate vhost_scsi_evt\n");
Asias Hea6c9af82013-04-25 15:35:21 +0800445 vs->vs_events_missed = true;
446 return NULL;
447 }
448
Michael S. Tsirkine72fd722014-11-23 18:01:34 +0200449 evt->event.event = cpu_to_vhost32(vq, event);
450 evt->event.reason = cpu_to_vhost32(vq, reason);
Asias Hea6c9af82013-04-25 15:35:21 +0800451 vs->vs_events_nr++;
452
453 return evt;
454}
455
Nicholas Bellinger084ed452013-06-06 02:20:41 -0700456static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
457{
Bart Van Asscheafc16602015-04-27 13:52:36 +0200458 return target_put_sess_cmd(se_cmd);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700459}
460
Asias He683bd962013-05-06 16:38:27 +0800461static void
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800462vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
Asias Hea6c9af82013-04-25 15:35:21 +0800463{
Asias He3ab2e422013-04-27 11:16:48 +0800464 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +0800465 struct virtio_scsi_event *event = &evt->event;
466 struct virtio_scsi_event __user *eventp;
467 unsigned out, in;
468 int head, ret;
469
Eugenio Pérez247643f2020-03-31 21:27:57 +0200470 if (!vhost_vq_get_backend(vq)) {
Asias Hea6c9af82013-04-25 15:35:21 +0800471 vs->vs_events_missed = true;
472 return;
473 }
474
475again:
476 vhost_disable_notify(&vs->dev, vq);
Michael S. Tsirkin47283be2014-06-05 15:20:27 +0300477 head = vhost_get_vq_desc(vq, vq->iov,
Asias Hea6c9af82013-04-25 15:35:21 +0800478 ARRAY_SIZE(vq->iov), &out, &in,
479 NULL, NULL);
480 if (head < 0) {
481 vs->vs_events_missed = true;
482 return;
483 }
484 if (head == vq->num) {
485 if (vhost_enable_notify(&vs->dev, vq))
486 goto again;
487 vs->vs_events_missed = true;
488 return;
489 }
490
491 if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
492 vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
493 vq->iov[out].iov_len);
494 vs->vs_events_missed = true;
495 return;
496 }
497
498 if (vs->vs_events_missed) {
Michael S. Tsirkine72fd722014-11-23 18:01:34 +0200499 event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED);
Asias Hea6c9af82013-04-25 15:35:21 +0800500 vs->vs_events_missed = false;
501 }
502
503 eventp = vq->iov[out].iov_base;
504 ret = __copy_to_user(eventp, event, sizeof(*event));
505 if (!ret)
506 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
507 else
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800508 vq_err(vq, "Faulted on vhost_scsi_send_event\n");
Asias Hea6c9af82013-04-25 15:35:21 +0800509}
510
Mike Christieb1b2ce52024-03-15 19:46:59 -0500511static void vhost_scsi_complete_events(struct vhost_scsi *vs, bool drop)
Asias Hea6c9af82013-04-25 15:35:21 +0800512{
Asias He3ab2e422013-04-27 11:16:48 +0800513 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Byungchul Park12bdcbd2017-05-12 09:42:56 +0900514 struct vhost_scsi_evt *evt, *t;
Asias Hea6c9af82013-04-25 15:35:21 +0800515 struct llist_node *llnode;
516
517 mutex_lock(&vq->mutex);
518 llnode = llist_del_all(&vs->vs_event_list);
Byungchul Park12bdcbd2017-05-12 09:42:56 +0900519 llist_for_each_entry_safe(evt, t, llnode, list) {
Mike Christieb1b2ce52024-03-15 19:46:59 -0500520 if (!drop)
521 vhost_scsi_do_evt_work(vs, evt);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800522 vhost_scsi_free_evt(vs, evt);
Asias Hea6c9af82013-04-25 15:35:21 +0800523 }
524 mutex_unlock(&vq->mutex);
525}
526
Mike Christieb1b2ce52024-03-15 19:46:59 -0500527static void vhost_scsi_evt_work(struct vhost_work *work)
528{
529 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
530 vs_event_work);
531 vhost_scsi_complete_events(vs, false);
532}
533
Mike Christie5ced58b2023-07-09 15:28:58 -0500534static int vhost_scsi_copy_sgl_to_iov(struct vhost_scsi_cmd *cmd)
535{
536 struct iov_iter *iter = &cmd->saved_iter;
537 struct scatterlist *sg = cmd->tvc_sgl;
538 struct page *page;
539 size_t len;
540 int i;
541
542 for (i = 0; i < cmd->tvc_sgl_count; i++) {
543 page = sg_page(&sg[i]);
544 len = sg[i].length;
545
546 if (copy_page_to_iter(page, 0, len, iter) != len) {
547 pr_err("Could not copy data while handling misaligned cmd. Error %zu\n",
548 len);
549 return -1;
550 }
551 }
552
553 return 0;
554}
555
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700556/* Fill in status and signal that we are done processing this command
557 *
558 * This is scheduled in the vhost work queue so we are called with the owner
559 * process mm and can access the vring.
560 */
561static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
562{
Mike Christie48ae70d2023-06-26 18:22:59 -0500563 struct vhost_scsi_virtqueue *svq = container_of(work,
564 struct vhost_scsi_virtqueue, completion_work);
Asias He9d6064a2013-01-06 14:36:13 +0800565 struct virtio_scsi_cmd_resp v_rsp;
Byungchul Park816e85e2017-11-09 09:00:21 +0900566 struct vhost_scsi_cmd *cmd, *t;
Asias He9d6064a2013-01-06 14:36:13 +0800567 struct llist_node *llnode;
568 struct se_cmd *se_cmd;
Nicholas Bellinger79c141412015-01-27 13:13:12 -0800569 struct iov_iter iov_iter;
Mike Christie48ae70d2023-06-26 18:22:59 -0500570 bool signal = false;
571 int ret;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700572
Mike Christie48ae70d2023-06-26 18:22:59 -0500573 llnode = llist_del_all(&svq->completion_list);
Byungchul Park816e85e2017-11-09 09:00:21 +0900574 llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) {
Asias He3c63f662013-05-06 16:38:29 +0800575 se_cmd = &cmd->tvc_se_cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700576
577 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
Asias He3c63f662013-05-06 16:38:29 +0800578 cmd, se_cmd->residual_count, se_cmd->scsi_status);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700579 memset(&v_rsp, 0, sizeof(v_rsp));
Mike Christie5ced58b2023-07-09 15:28:58 -0500580
581 if (cmd->saved_iter_addr && vhost_scsi_copy_sgl_to_iov(cmd)) {
582 v_rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
583 } else {
584 v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq,
585 se_cmd->residual_count);
586 /* TODO is status_qualifier field needed? */
587 v_rsp.status = se_cmd->scsi_status;
588 v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq,
589 se_cmd->scsi_sense_length);
590 memcpy(v_rsp.sense, cmd->tvc_sense_buf,
591 se_cmd->scsi_sense_length);
592 }
Nicholas Bellinger79c141412015-01-27 13:13:12 -0800593
Jason Wang6dd88fd2023-01-19 15:36:47 +0800594 iov_iter_init(&iov_iter, ITER_DEST, cmd->tvc_resp_iov,
Nicholas Bellinger79c141412015-01-27 13:13:12 -0800595 cmd->tvc_in_iovs, sizeof(v_rsp));
596 ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter);
597 if (likely(ret == sizeof(v_rsp))) {
Mike Christie48ae70d2023-06-26 18:22:59 -0500598 signal = true;
599
Asias He3c63f662013-05-06 16:38:29 +0800600 vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
Asias He1b7f3902013-02-06 13:20:59 +0800601 } else
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700602 pr_err("Faulted on virtio_scsi_cmd_resp\n");
603
Mike Christie47a35652020-11-09 23:33:21 -0600604 vhost_scsi_release_cmd_res(se_cmd);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700605 }
606
Mike Christie48ae70d2023-06-26 18:22:59 -0500607 if (signal)
608 vhost_signal(&svq->vs->dev, &svq->vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700609}
610
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800611static struct vhost_scsi_cmd *
Mike Christie25b98b62020-11-09 23:33:20 -0600612vhost_scsi_get_cmd(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg,
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800613 unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
614 u32 exp_data_len, int data_direction)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700615{
Mike Christie25b98b62020-11-09 23:33:20 -0600616 struct vhost_scsi_virtqueue *svq = container_of(vq,
617 struct vhost_scsi_virtqueue, vq);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800618 struct vhost_scsi_cmd *cmd;
619 struct vhost_scsi_nexus *tv_nexus;
Nicholas Bellingerb1935f62014-02-22 18:08:24 -0800620 struct scatterlist *sg, *prot_sg;
Jason Wang6dd88fd2023-01-19 15:36:47 +0800621 struct iovec *tvc_resp_iov;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700622 struct page **pages;
Mike Christie25b98b62020-11-09 23:33:20 -0600623 int tag;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700624
Asias He98718312013-05-06 16:38:28 +0800625 tv_nexus = tpg->tpg_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700626 if (!tv_nexus) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800627 pr_err("Unable to locate active struct vhost_scsi_nexus\n");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700628 return ERR_PTR(-EIO);
629 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700630
Ming Leic548e622021-01-22 10:33:08 +0800631 tag = sbitmap_get(&svq->scsi_tags);
Nicholas Bellinger4a47d3a2013-09-23 11:42:28 -0700632 if (tag < 0) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800633 pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
Nicholas Bellinger4a47d3a2013-09-23 11:42:28 -0700634 return ERR_PTR(-ENOMEM);
635 }
636
Mike Christie25b98b62020-11-09 23:33:20 -0600637 cmd = &svq->scsi_cmds[tag];
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700638 sg = cmd->tvc_sgl;
Nicholas Bellingerb1935f62014-02-22 18:08:24 -0800639 prot_sg = cmd->tvc_prot_sgl;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700640 pages = cmd->tvc_upages;
Jason Wang6dd88fd2023-01-19 15:36:47 +0800641 tvc_resp_iov = cmd->tvc_resp_iov;
Markus Elfring473f0b12017-05-20 13:48:44 +0200642 memset(cmd, 0, sizeof(*cmd));
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700643 cmd->tvc_sgl = sg;
Nicholas Bellingerb1935f62014-02-22 18:08:24 -0800644 cmd->tvc_prot_sgl = prot_sg;
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700645 cmd->tvc_upages = pages;
Nicholas Bellinger4824d3b2013-06-07 17:47:46 -0700646 cmd->tvc_se_cmd.map_tag = tag;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800647 cmd->tvc_tag = scsi_tag;
648 cmd->tvc_lun = lun;
649 cmd->tvc_task_attr = task_attr;
Asias He3c63f662013-05-06 16:38:29 +0800650 cmd->tvc_exp_data_len = exp_data_len;
651 cmd->tvc_data_direction = data_direction;
652 cmd->tvc_nexus = tv_nexus;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800653 cmd->inflight = vhost_scsi_get_inflight(vq);
Jason Wang6dd88fd2023-01-19 15:36:47 +0800654 cmd->tvc_resp_iov = tvc_resp_iov;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700655
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800656 memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE);
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800657
Asias He3c63f662013-05-06 16:38:29 +0800658 return cmd;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700659}
660
661/*
662 * Map a user memory range into a scatterlist
663 *
664 * Returns the number of scatterlist entries used or -errno on error.
665 */
Asias He683bd962013-05-06 16:38:27 +0800666static int
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800667vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd,
Al Viro2f240c42017-09-24 22:07:59 -0400668 struct iov_iter *iter,
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -0700669 struct scatterlist *sgl,
Mike Christie5ced58b2023-07-09 15:28:58 -0500670 bool is_prot)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700671{
Nicholas Bellingerb4078b52015-01-28 13:10:51 -0800672 struct page **pages = cmd->tvc_upages;
Al Viro2f240c42017-09-24 22:07:59 -0400673 struct scatterlist *sg = sgl;
Mike Christie5ced58b2023-07-09 15:28:58 -0500674 ssize_t bytes, mapped_bytes;
675 size_t offset, mapped_offset;
Al Viro2f240c42017-09-24 22:07:59 -0400676 unsigned int npages = 0;
Asias He18100532013-01-22 11:20:27 +0800677
Al Viro1ef255e2022-06-09 10:28:36 -0400678 bytes = iov_iter_get_pages2(iter, pages, LONG_MAX,
Al Viro2f240c42017-09-24 22:07:59 -0400679 VHOST_SCSI_PREALLOC_UPAGES, &offset);
Asias He18100532013-01-22 11:20:27 +0800680 /* No pages were pinned */
Al Viro2f240c42017-09-24 22:07:59 -0400681 if (bytes <= 0)
682 return bytes < 0 ? bytes : -EFAULT;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700683
Mike Christie5ced58b2023-07-09 15:28:58 -0500684 mapped_bytes = bytes;
685 mapped_offset = offset;
686
Al Viro2f240c42017-09-24 22:07:59 -0400687 while (bytes) {
688 unsigned n = min_t(unsigned, PAGE_SIZE - offset, bytes);
Mike Christie5ced58b2023-07-09 15:28:58 -0500689 /*
690 * The block layer requires bios/requests to be a multiple of
691 * 512 bytes, but Windows can send us vecs that are misaligned.
692 * This can result in bios and later requests with misaligned
693 * sizes if we have to break up a cmd/scatterlist into multiple
694 * bios.
695 *
696 * We currently only break up a command into multiple bios if
697 * we hit the vec/seg limit, so check if our sgl_count is
698 * greater than the max and if a vec in the cmd has a
699 * misaligned offset/size.
700 */
701 if (!is_prot &&
702 (offset & (SECTOR_SIZE - 1) || n & (SECTOR_SIZE - 1)) &&
703 cmd->tvc_sgl_count > BIO_MAX_VECS) {
704 WARN_ONCE(true,
705 "vhost-scsi detected misaligned IO. Performance may be degraded.");
706 goto revert_iter_get_pages;
707 }
708
Al Viro2f240c42017-09-24 22:07:59 -0400709 sg_set_page(sg++, pages[npages++], n, offset);
710 bytes -= n;
711 offset = 0;
712 }
Mike Christie5ced58b2023-07-09 15:28:58 -0500713
Al Viro2f240c42017-09-24 22:07:59 -0400714 return npages;
Mike Christie5ced58b2023-07-09 15:28:58 -0500715
716revert_iter_get_pages:
717 iov_iter_revert(iter, mapped_bytes);
718
719 npages = 0;
720 while (mapped_bytes) {
721 unsigned int n = min_t(unsigned int, PAGE_SIZE - mapped_offset,
722 mapped_bytes);
723
724 put_page(pages[npages++]);
725
726 mapped_bytes -= n;
727 mapped_offset = 0;
728 }
729
730 return -EINVAL;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700731}
732
Asias He683bd962013-05-06 16:38:27 +0800733static int
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800734vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700735{
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800736 int sgl_count = 0;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700737
Jens Axboede4f5fe2023-03-29 08:52:15 -0600738 if (!iter || !iter_iov(iter)) {
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800739 pr_err("%s: iter->iov is NULL, but expected bytes: %zu"
740 " present\n", __func__, bytes);
741 return -EINVAL;
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800742 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700743
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800744 sgl_count = iov_iter_npages(iter, 0xffff);
745 if (sgl_count > max_sgls) {
746 pr_err("%s: requested sgl_count: %d exceeds pre-allocated"
747 " max_sgls: %d\n", __func__, sgl_count, max_sgls);
748 return -EINVAL;
749 }
750 return sgl_count;
751}
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700752
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800753static int
Mike Christie5ced58b2023-07-09 15:28:58 -0500754vhost_scsi_copy_iov_to_sgl(struct vhost_scsi_cmd *cmd, struct iov_iter *iter,
755 struct scatterlist *sg, int sg_count)
756{
757 size_t len = iov_iter_count(iter);
758 unsigned int nbytes = 0;
759 struct page *page;
760 int i;
761
762 if (cmd->tvc_data_direction == DMA_FROM_DEVICE) {
763 cmd->saved_iter_addr = dup_iter(&cmd->saved_iter, iter,
764 GFP_KERNEL);
765 if (!cmd->saved_iter_addr)
766 return -ENOMEM;
767 }
768
769 for (i = 0; i < sg_count; i++) {
770 page = alloc_page(GFP_KERNEL);
771 if (!page) {
772 i--;
773 goto err;
774 }
775
776 nbytes = min_t(unsigned int, PAGE_SIZE, len);
777 sg_set_page(&sg[i], page, nbytes, 0);
778
779 if (cmd->tvc_data_direction == DMA_TO_DEVICE &&
780 copy_page_from_iter(page, 0, nbytes, iter) != nbytes)
781 goto err;
782
783 len -= nbytes;
784 }
785
786 cmd->copied_iov = 1;
787 return 0;
788
789err:
790 pr_err("Could not read %u bytes while handling misaligned cmd\n",
791 nbytes);
792
793 for (; i >= 0; i--)
794 __free_page(sg_page(&sg[i]));
795 kfree(cmd->saved_iter_addr);
796 return -ENOMEM;
797}
798
799static int
Mike Christiec5ace19e2023-07-09 15:28:59 -0500800vhost_scsi_map_iov_to_sgl(struct vhost_scsi_cmd *cmd, struct iov_iter *iter,
801 struct scatterlist *sg, int sg_count, bool is_prot)
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800802{
Al Viro11d49e92017-09-24 18:36:44 -0400803 struct scatterlist *p = sg;
Mike Christie5ced58b2023-07-09 15:28:58 -0500804 size_t revert_bytes;
Al Viro2f240c42017-09-24 22:07:59 -0400805 int ret;
Nicholas Bellinger5a01d082014-02-22 18:34:08 -0800806
Al Viro2f240c42017-09-24 22:07:59 -0400807 while (iov_iter_count(iter)) {
Mike Christie5ced58b2023-07-09 15:28:58 -0500808 ret = vhost_scsi_map_to_sgl(cmd, iter, sg, is_prot);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700809 if (ret < 0) {
Mike Christie5ced58b2023-07-09 15:28:58 -0500810 revert_bytes = 0;
811
Al Viro11d49e92017-09-24 18:36:44 -0400812 while (p < sg) {
Mike Christie5ced58b2023-07-09 15:28:58 -0500813 struct page *page = sg_page(p);
814
815 if (page) {
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800816 put_page(page);
Mike Christie5ced58b2023-07-09 15:28:58 -0500817 revert_bytes += p->length;
818 }
819 p++;
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800820 }
Mike Christie5ced58b2023-07-09 15:28:58 -0500821
822 iov_iter_revert(iter, revert_bytes);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700823 return ret;
824 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700825 sg += ret;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700826 }
Mike Christie5ced58b2023-07-09 15:28:58 -0500827
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700828 return 0;
829}
830
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800831static int
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800832vhost_scsi_mapal(struct vhost_scsi_cmd *cmd,
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800833 size_t prot_bytes, struct iov_iter *prot_iter,
834 size_t data_bytes, struct iov_iter *data_iter)
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800835{
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800836 int sgl_count, ret;
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800837
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800838 if (prot_bytes) {
839 sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800840 VHOST_SCSI_PREALLOC_PROT_SGLS);
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800841 if (sgl_count < 0)
842 return sgl_count;
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800843
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800844 sg_init_table(cmd->tvc_prot_sgl, sgl_count);
845 cmd->tvc_prot_sgl_count = sgl_count;
846 pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
847 cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count);
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800848
Mike Christiec5ace19e2023-07-09 15:28:59 -0500849 ret = vhost_scsi_map_iov_to_sgl(cmd, prot_iter,
850 cmd->tvc_prot_sgl,
851 cmd->tvc_prot_sgl_count, true);
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800852 if (ret < 0) {
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800853 cmd->tvc_prot_sgl_count = 0;
854 return ret;
855 }
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800856 }
857 sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -0800858 VHOST_SCSI_PREALLOC_SGLS);
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800859 if (sgl_count < 0)
860 return sgl_count;
861
862 sg_init_table(cmd->tvc_sgl, sgl_count);
863 cmd->tvc_sgl_count = sgl_count;
864 pr_debug("%s data_sg %p data_sgl_count %u\n", __func__,
865 cmd->tvc_sgl, cmd->tvc_sgl_count);
866
Mike Christiec5ace19e2023-07-09 15:28:59 -0500867 ret = vhost_scsi_map_iov_to_sgl(cmd, data_iter, cmd->tvc_sgl,
868 cmd->tvc_sgl_count, false);
Mike Christie5ced58b2023-07-09 15:28:58 -0500869 if (ret == -EINVAL) {
870 sg_init_table(cmd->tvc_sgl, cmd->tvc_sgl_count);
871 ret = vhost_scsi_copy_iov_to_sgl(cmd, data_iter, cmd->tvc_sgl,
872 cmd->tvc_sgl_count);
873 }
874
Nicholas Bellingere8de56b2015-01-28 00:15:00 -0800875 if (ret < 0) {
876 cmd->tvc_sgl_count = 0;
877 return ret;
Nicholas Bellingere31885d2014-02-22 18:34:43 -0800878 }
879 return 0;
880}
881
Nicholas Bellinger46243862014-12-21 10:42:08 -0800882static int vhost_scsi_to_tcm_attr(int attr)
883{
884 switch (attr) {
885 case VIRTIO_SCSI_S_SIMPLE:
886 return TCM_SIMPLE_TAG;
887 case VIRTIO_SCSI_S_ORDERED:
888 return TCM_ORDERED_TAG;
889 case VIRTIO_SCSI_S_HEAD:
890 return TCM_HEAD_TAG;
891 case VIRTIO_SCSI_S_ACA:
892 return TCM_ACA_TAG;
893 default:
894 break;
895 }
896 return TCM_SIMPLE_TAG;
897}
898
Mike Christie6ec29cb2021-02-27 10:59:58 -0600899static void vhost_scsi_target_queue_cmd(struct vhost_scsi_cmd *cmd)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700900{
Asias He3c63f662013-05-06 16:38:29 +0800901 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
Mike Christie6ec29cb2021-02-27 10:59:58 -0600902 struct vhost_scsi_nexus *tv_nexus;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800903 struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700904
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800905 /* FIXME: BIDI operation */
Asias He3c63f662013-05-06 16:38:29 +0800906 if (cmd->tvc_sgl_count) {
907 sg_ptr = cmd->tvc_sgl;
Nicholas Bellinger95e7c432014-02-22 18:22:31 -0800908
909 if (cmd->tvc_prot_sgl_count)
910 sg_prot_ptr = cmd->tvc_prot_sgl;
911 else
912 se_cmd->prot_pto = true;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700913 } else {
914 sg_ptr = NULL;
915 }
Asias He3c63f662013-05-06 16:38:29 +0800916 tv_nexus = cmd->tvc_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700917
Bart Van Assche649ee052015-04-14 13:26:44 +0200918 se_cmd->tag = 0;
Mike Christieeb929802021-02-27 10:59:52 -0600919 target_init_cmd(se_cmd, tv_nexus->tvn_se_sess, &cmd->tvc_sense_buf[0],
Asias He3c63f662013-05-06 16:38:29 +0800920 cmd->tvc_lun, cmd->tvc_exp_data_len,
Nicholas Bellinger46243862014-12-21 10:42:08 -0800921 vhost_scsi_to_tcm_attr(cmd->tvc_task_attr),
Mike Christieeb929802021-02-27 10:59:52 -0600922 cmd->tvc_data_direction, TARGET_SCF_ACK_KREF);
923
924 if (target_submit_prep(se_cmd, cmd->tvc_cdb, sg_ptr,
925 cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr,
Mike Christie08694192021-02-27 10:59:56 -0600926 cmd->tvc_prot_sgl_count, GFP_KERNEL))
Mike Christieeb929802021-02-27 10:59:52 -0600927 return;
928
Mike Christiee2f4ea42023-09-27 21:09:05 -0500929 target_submit(se_cmd);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -0700930}
931
Asias He683bd962013-05-06 16:38:27 +0800932static void
933vhost_scsi_send_bad_target(struct vhost_scsi *vs,
934 struct vhost_virtqueue *vq,
935 int head, unsigned out)
Asias He637ab212013-04-10 15:06:15 +0800936{
937 struct virtio_scsi_cmd_resp __user *resp;
938 struct virtio_scsi_cmd_resp rsp;
939 int ret;
940
941 memset(&rsp, 0, sizeof(rsp));
942 rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
943 resp = vq->iov[out].iov_base;
944 ret = __copy_to_user(resp, &rsp, sizeof(rsp));
945 if (!ret)
946 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
947 else
948 pr_err("Faulted on virtio_scsi_cmd_resp\n");
949}
950
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -0700951static int
952vhost_scsi_get_desc(struct vhost_scsi *vs, struct vhost_virtqueue *vq,
953 struct vhost_scsi_ctx *vc)
954{
955 int ret = -ENXIO;
956
957 vc->head = vhost_get_vq_desc(vq, vq->iov,
958 ARRAY_SIZE(vq->iov), &vc->out, &vc->in,
959 NULL, NULL);
960
961 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
962 vc->head, vc->out, vc->in);
963
964 /* On error, stop handling until the next kick. */
965 if (unlikely(vc->head < 0))
966 goto done;
967
968 /* Nothing new? Wait for eventfd to tell us they refilled. */
969 if (vc->head == vq->num) {
970 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
971 vhost_disable_notify(&vs->dev, vq);
972 ret = -EAGAIN;
973 }
974 goto done;
975 }
976
977 /*
978 * Get the size of request and response buffers.
Bijan Mottahedeh09d75832018-09-17 17:09:49 -0700979 * FIXME: Not correct for BIDI operation
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -0700980 */
981 vc->out_size = iov_length(vq->iov, vc->out);
982 vc->in_size = iov_length(&vq->iov[vc->out], vc->in);
983
984 /*
985 * Copy over the virtio-scsi request header, which for a
986 * ANY_LAYOUT enabled guest may span multiple iovecs, or a
987 * single iovec may contain both the header + outgoing
988 * WRITE payloads.
989 *
990 * copy_from_iter() will advance out_iter, so that it will
991 * point at the start of the outgoing WRITE payload, if
992 * DMA_TO_DEVICE is set.
993 */
Al Virode4eda92022-09-15 20:25:47 -0400994 iov_iter_init(&vc->out_iter, ITER_SOURCE, vq->iov, vc->out, vc->out_size);
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -0700995 ret = 0;
996
997done:
998 return ret;
999}
1000
1001static int
1002vhost_scsi_chk_size(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc)
1003{
1004 if (unlikely(vc->in_size < vc->rsp_size)) {
1005 vq_err(vq,
1006 "Response buf too small, need min %zu bytes got %zu",
1007 vc->rsp_size, vc->in_size);
1008 return -EINVAL;
1009 } else if (unlikely(vc->out_size < vc->req_size)) {
1010 vq_err(vq,
1011 "Request buf too small, need min %zu bytes got %zu",
1012 vc->req_size, vc->out_size);
1013 return -EIO;
1014 }
1015
1016 return 0;
1017}
1018
1019static int
1020vhost_scsi_get_req(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc,
1021 struct vhost_scsi_tpg **tpgp)
1022{
1023 int ret = -EIO;
1024
1025 if (unlikely(!copy_from_iter_full(vc->req, vc->req_size,
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001026 &vc->out_iter))) {
wangyana691ffb2018-12-13 09:10:14 +08001027 vq_err(vq, "Faulted on copy_from_iter_full\n");
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001028 } else if (unlikely(*vc->lunp != 1)) {
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001029 /* virtio-scsi spec requires byte 0 of the lun to be 1 */
1030 vq_err(vq, "Illegal virtio-scsi lun: %u\n", *vc->lunp);
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001031 } else {
Haoran Zhang221af822024-10-01 15:14:15 -05001032 struct vhost_scsi_tpg **vs_tpg, *tpg = NULL;
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001033
Haoran Zhang221af822024-10-01 15:14:15 -05001034 if (vc->target) {
1035 /* validated at handler entry */
1036 vs_tpg = vhost_vq_get_backend(vq);
1037 tpg = READ_ONCE(vs_tpg[*vc->target]);
1038 if (unlikely(!tpg)) {
1039 vq_err(vq, "Target 0x%x does not exist\n", *vc->target);
1040 goto out;
1041 }
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001042 }
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001043
Haoran Zhang221af822024-10-01 15:14:15 -05001044 if (tpgp)
1045 *tpgp = tpg;
1046 ret = 0;
1047 }
1048out:
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001049 return ret;
1050}
1051
Mike Christie18f1bec2020-11-09 23:33:22 -06001052static u16 vhost_buf_to_lun(u8 *lun_buf)
1053{
1054 return ((lun_buf[2] << 8) | lun_buf[3]) & 0x3FFF;
1055}
1056
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001057static void
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001058vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
1059{
1060 struct vhost_scsi_tpg **vs_tpg, *tpg;
1061 struct virtio_scsi_cmd_req v_req;
1062 struct virtio_scsi_cmd_req_pi v_req_pi;
1063 struct vhost_scsi_ctx vc;
1064 struct vhost_scsi_cmd *cmd;
1065 struct iov_iter in_iter, prot_iter, data_iter;
1066 u64 tag;
1067 u32 exp_data_len, data_direction;
Jason Wang6dd88fd2023-01-19 15:36:47 +08001068 int ret, prot_bytes, i, c = 0;
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001069 u16 lun;
1070 u8 task_attr;
1071 bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI);
1072 void *cdb;
1073
1074 mutex_lock(&vq->mutex);
1075 /*
1076 * We can handle the vq only after the endpoint is setup by calling the
1077 * VHOST_SCSI_SET_ENDPOINT ioctl.
1078 */
Eugenio Pérez247643f2020-03-31 21:27:57 +02001079 vs_tpg = vhost_vq_get_backend(vq);
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001080 if (!vs_tpg)
1081 goto out;
1082
1083 memset(&vc, 0, sizeof(vc));
1084 vc.rsp_size = sizeof(struct virtio_scsi_cmd_resp);
1085
1086 vhost_disable_notify(&vs->dev, vq);
1087
Jason Wangc1ea02f2019-05-17 00:29:52 -04001088 do {
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001089 ret = vhost_scsi_get_desc(vs, vq, &vc);
1090 if (ret)
1091 goto err;
1092
1093 /*
1094 * Setup pointers and values based upon different virtio-scsi
1095 * request header if T10_PI is enabled in KVM guest.
1096 */
1097 if (t10_pi) {
1098 vc.req = &v_req_pi;
1099 vc.req_size = sizeof(v_req_pi);
1100 vc.lunp = &v_req_pi.lun[0];
1101 vc.target = &v_req_pi.lun[1];
1102 } else {
1103 vc.req = &v_req;
1104 vc.req_size = sizeof(v_req);
1105 vc.lunp = &v_req.lun[0];
1106 vc.target = &v_req.lun[1];
1107 }
1108
1109 /*
1110 * Validate the size of request and response buffers.
1111 * Check for a sane response buffer so we can report
1112 * early errors back to the guest.
1113 */
1114 ret = vhost_scsi_chk_size(vq, &vc);
1115 if (ret)
1116 goto err;
1117
1118 ret = vhost_scsi_get_req(vq, &vc, &tpg);
1119 if (ret)
1120 goto err;
1121
1122 ret = -EIO; /* bad target on any error from here on */
1123
1124 /*
1125 * Determine data_direction by calculating the total outgoing
1126 * iovec sizes + incoming iovec sizes vs. virtio-scsi request +
1127 * response headers respectively.
1128 *
1129 * For DMA_TO_DEVICE this is out_iter, which is already pointing
1130 * to the right place.
1131 *
1132 * For DMA_FROM_DEVICE, the iovec will be just past the end
1133 * of the virtio-scsi response header in either the same
1134 * or immediately following iovec.
1135 *
1136 * Any associated T10_PI bytes for the outgoing / incoming
1137 * payloads are included in calculation of exp_data_len here.
1138 */
1139 prot_bytes = 0;
1140
1141 if (vc.out_size > vc.req_size) {
1142 data_direction = DMA_TO_DEVICE;
1143 exp_data_len = vc.out_size - vc.req_size;
1144 data_iter = vc.out_iter;
1145 } else if (vc.in_size > vc.rsp_size) {
1146 data_direction = DMA_FROM_DEVICE;
1147 exp_data_len = vc.in_size - vc.rsp_size;
1148
Al Virode4eda92022-09-15 20:25:47 -04001149 iov_iter_init(&in_iter, ITER_DEST, &vq->iov[vc.out], vc.in,
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001150 vc.rsp_size + exp_data_len);
1151 iov_iter_advance(&in_iter, vc.rsp_size);
1152 data_iter = in_iter;
1153 } else {
1154 data_direction = DMA_NONE;
1155 exp_data_len = 0;
1156 }
1157 /*
1158 * If T10_PI header + payload is present, setup prot_iter values
1159 * and recalculate data_iter for vhost_scsi_mapal() mapping to
1160 * host scatterlists via get_user_pages_fast().
1161 */
1162 if (t10_pi) {
1163 if (v_req_pi.pi_bytesout) {
1164 if (data_direction != DMA_TO_DEVICE) {
1165 vq_err(vq, "Received non zero pi_bytesout,"
1166 " but wrong data_direction\n");
1167 goto err;
1168 }
1169 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout);
1170 } else if (v_req_pi.pi_bytesin) {
1171 if (data_direction != DMA_FROM_DEVICE) {
1172 vq_err(vq, "Received non zero pi_bytesin,"
1173 " but wrong data_direction\n");
1174 goto err;
1175 }
1176 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin);
1177 }
1178 /*
1179 * Set prot_iter to data_iter and truncate it to
1180 * prot_bytes, and advance data_iter past any
Geert Uytterhoeven5ff1f512023-09-28 14:18:33 +02001181 * preceding prot_bytes that may be present.
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001182 *
1183 * Also fix up the exp_data_len to reflect only the
1184 * actual data payload length.
1185 */
1186 if (prot_bytes) {
1187 exp_data_len -= prot_bytes;
1188 prot_iter = data_iter;
1189 iov_iter_truncate(&prot_iter, prot_bytes);
1190 iov_iter_advance(&data_iter, prot_bytes);
1191 }
1192 tag = vhost64_to_cpu(vq, v_req_pi.tag);
1193 task_attr = v_req_pi.task_attr;
1194 cdb = &v_req_pi.cdb[0];
Mike Christie18f1bec2020-11-09 23:33:22 -06001195 lun = vhost_buf_to_lun(v_req_pi.lun);
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001196 } else {
1197 tag = vhost64_to_cpu(vq, v_req.tag);
1198 task_attr = v_req.task_attr;
1199 cdb = &v_req.cdb[0];
Mike Christie18f1bec2020-11-09 23:33:22 -06001200 lun = vhost_buf_to_lun(v_req.lun);
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001201 }
1202 /*
1203 * Check that the received CDB size does not exceeded our
1204 * hardcoded max for vhost-scsi, then get a pre-allocated
1205 * cmd descriptor for the new virtio-scsi tag.
1206 *
1207 * TODO what if cdb was too small for varlen cdb header?
1208 */
1209 if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) {
1210 vq_err(vq, "Received SCSI CDB with command_size: %d that"
1211 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1212 scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE);
1213 goto err;
1214 }
Mike Christie25b98b62020-11-09 23:33:20 -06001215 cmd = vhost_scsi_get_cmd(vq, tpg, cdb, tag, lun, task_attr,
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001216 exp_data_len + prot_bytes,
1217 data_direction);
1218 if (IS_ERR(cmd)) {
Mike Christie25b98b62020-11-09 23:33:20 -06001219 vq_err(vq, "vhost_scsi_get_cmd failed %ld\n",
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001220 PTR_ERR(cmd));
1221 goto err;
1222 }
1223 cmd->tvc_vhost = vs;
1224 cmd->tvc_vq = vq;
Jason Wang6dd88fd2023-01-19 15:36:47 +08001225 for (i = 0; i < vc.in ; i++)
1226 cmd->tvc_resp_iov[i] = vq->iov[vc.out + i];
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001227 cmd->tvc_in_iovs = vc.in;
1228
1229 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
1230 cmd->tvc_cdb[0], cmd->tvc_lun);
1231 pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:"
1232 " %d\n", cmd, exp_data_len, prot_bytes, data_direction);
1233
1234 if (data_direction != DMA_NONE) {
1235 if (unlikely(vhost_scsi_mapal(cmd, prot_bytes,
1236 &prot_iter, exp_data_len,
1237 &data_iter))) {
1238 vq_err(vq, "Failed to map iov to sgl\n");
Mike Christie47a35652020-11-09 23:33:21 -06001239 vhost_scsi_release_cmd_res(&cmd->tvc_se_cmd);
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001240 goto err;
1241 }
1242 }
1243 /*
1244 * Save the descriptor from vhost_get_vq_desc() to be used to
1245 * complete the virtio-scsi request in TCM callback context via
1246 * vhost_scsi_queue_data_in() and vhost_scsi_queue_status()
1247 */
1248 cmd->tvc_vq_desc = vc.head;
Mike Christie6ec29cb2021-02-27 10:59:58 -06001249 vhost_scsi_target_queue_cmd(cmd);
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001250 ret = 0;
1251err:
1252 /*
1253 * ENXIO: No more requests, or read error, wait for next kick
1254 * EINVAL: Invalid response buffer, drop the request
1255 * EIO: Respond with bad target
1256 * EAGAIN: Pending request
1257 */
1258 if (ret == -ENXIO)
1259 break;
1260 else if (ret == -EIO)
1261 vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out);
Jason Wangc1ea02f2019-05-17 00:29:52 -04001262 } while (likely(!vhost_exceeds_weight(vq, ++c, 0)));
Bijan Mottahedeh09d75832018-09-17 17:09:49 -07001263out:
1264 mutex_unlock(&vq->mutex);
1265}
1266
1267static void
Mike Christieefd838f2020-11-09 23:33:23 -06001268vhost_scsi_send_tmf_resp(struct vhost_scsi *vs, struct vhost_virtqueue *vq,
1269 int in_iovs, int vq_desc, struct iovec *resp_iov,
1270 int tmf_resp_code)
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001271{
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001272 struct virtio_scsi_ctrl_tmf_resp rsp;
Bijan Mottahedeh8e5dadf2018-12-03 16:48:23 -08001273 struct iov_iter iov_iter;
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001274 int ret;
1275
1276 pr_debug("%s\n", __func__);
1277 memset(&rsp, 0, sizeof(rsp));
Mike Christieefd838f2020-11-09 23:33:23 -06001278 rsp.response = tmf_resp_code;
Bijan Mottahedeh8e5dadf2018-12-03 16:48:23 -08001279
Al Virode4eda92022-09-15 20:25:47 -04001280 iov_iter_init(&iov_iter, ITER_DEST, resp_iov, in_iovs, sizeof(rsp));
Bijan Mottahedeh8e5dadf2018-12-03 16:48:23 -08001281
1282 ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter);
1283 if (likely(ret == sizeof(rsp)))
Mike Christieefd838f2020-11-09 23:33:23 -06001284 vhost_add_used_and_signal(&vs->dev, vq, vq_desc, 0);
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001285 else
1286 pr_err("Faulted on virtio_scsi_ctrl_tmf_resp\n");
1287}
1288
Mike Christieefd838f2020-11-09 23:33:23 -06001289static void vhost_scsi_tmf_resp_work(struct vhost_work *work)
1290{
1291 struct vhost_scsi_tmf *tmf = container_of(work, struct vhost_scsi_tmf,
1292 vwork);
Mike Christie59b701b2024-03-15 19:47:01 -05001293 int resp_code;
Mike Christieefd838f2020-11-09 23:33:23 -06001294
Mike Christie59b701b2024-03-15 19:47:01 -05001295 if (tmf->scsi_resp == TMR_FUNCTION_COMPLETE)
Mike Christieefd838f2020-11-09 23:33:23 -06001296 resp_code = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
Mike Christie59b701b2024-03-15 19:47:01 -05001297 else
Mike Christieefd838f2020-11-09 23:33:23 -06001298 resp_code = VIRTIO_SCSI_S_FUNCTION_REJECTED;
1299
1300 vhost_scsi_send_tmf_resp(tmf->vhost, &tmf->svq->vq, tmf->in_iovs,
1301 tmf->vq_desc, &tmf->resp_iov, resp_code);
1302 vhost_scsi_release_tmf_res(tmf);
1303}
1304
Mike Christie59b701b2024-03-15 19:47:01 -05001305static void vhost_scsi_tmf_flush_work(struct work_struct *work)
1306{
1307 struct vhost_scsi_tmf *tmf = container_of(work, struct vhost_scsi_tmf,
1308 flush_work);
1309 struct vhost_virtqueue *vq = &tmf->svq->vq;
1310 /*
1311 * Make sure we have sent responses for other commands before we
1312 * send our response.
1313 */
1314 vhost_dev_flush(vq->dev);
Mike Christie0352c962024-03-15 19:47:03 -05001315 if (!vhost_vq_work_queue(vq, &tmf->vwork))
1316 vhost_scsi_release_tmf_res(tmf);
Mike Christie59b701b2024-03-15 19:47:01 -05001317}
1318
Mike Christieefd838f2020-11-09 23:33:23 -06001319static void
1320vhost_scsi_handle_tmf(struct vhost_scsi *vs, struct vhost_scsi_tpg *tpg,
1321 struct vhost_virtqueue *vq,
1322 struct virtio_scsi_ctrl_tmf_req *vtmf,
1323 struct vhost_scsi_ctx *vc)
1324{
1325 struct vhost_scsi_virtqueue *svq = container_of(vq,
1326 struct vhost_scsi_virtqueue, vq);
1327 struct vhost_scsi_tmf *tmf;
1328
1329 if (vhost32_to_cpu(vq, vtmf->subtype) !=
1330 VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET)
1331 goto send_reject;
1332
1333 if (!tpg->tpg_nexus || !tpg->tpg_nexus->tvn_se_sess) {
1334 pr_err("Unable to locate active struct vhost_scsi_nexus for LUN RESET.\n");
1335 goto send_reject;
1336 }
1337
Mike Christie4c363c82023-03-20 21:06:19 -05001338 tmf = kzalloc(sizeof(*tmf), GFP_KERNEL);
1339 if (!tmf)
Mike Christieefd838f2020-11-09 23:33:23 -06001340 goto send_reject;
Mike Christieefd838f2020-11-09 23:33:23 -06001341
Mike Christie59b701b2024-03-15 19:47:01 -05001342 INIT_WORK(&tmf->flush_work, vhost_scsi_tmf_flush_work);
Mike Christie4c363c82023-03-20 21:06:19 -05001343 vhost_work_init(&tmf->vwork, vhost_scsi_tmf_resp_work);
Mike Christieefd838f2020-11-09 23:33:23 -06001344 tmf->vhost = vs;
1345 tmf->svq = svq;
1346 tmf->resp_iov = vq->iov[vc->out];
1347 tmf->vq_desc = vc->head;
1348 tmf->in_iovs = vc->in;
1349 tmf->inflight = vhost_scsi_get_inflight(vq);
1350
1351 if (target_submit_tmr(&tmf->se_cmd, tpg->tpg_nexus->tvn_se_sess, NULL,
1352 vhost_buf_to_lun(vtmf->lun), NULL,
1353 TMR_LUN_RESET, GFP_KERNEL, 0,
1354 TARGET_SCF_ACK_KREF) < 0) {
1355 vhost_scsi_release_tmf_res(tmf);
1356 goto send_reject;
1357 }
1358
1359 return;
1360
1361send_reject:
1362 vhost_scsi_send_tmf_resp(vs, vq, vc->in, vc->head, &vq->iov[vc->out],
1363 VIRTIO_SCSI_S_FUNCTION_REJECTED);
1364}
1365
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001366static void
1367vhost_scsi_send_an_resp(struct vhost_scsi *vs,
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001368 struct vhost_virtqueue *vq,
1369 struct vhost_scsi_ctx *vc)
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001370{
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001371 struct virtio_scsi_ctrl_an_resp rsp;
Bijan Mottahedeh8e5dadf2018-12-03 16:48:23 -08001372 struct iov_iter iov_iter;
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001373 int ret;
1374
1375 pr_debug("%s\n", __func__);
1376 memset(&rsp, 0, sizeof(rsp)); /* event_actual = 0 */
1377 rsp.response = VIRTIO_SCSI_S_OK;
Bijan Mottahedeh8e5dadf2018-12-03 16:48:23 -08001378
Al Virode4eda92022-09-15 20:25:47 -04001379 iov_iter_init(&iov_iter, ITER_DEST, &vq->iov[vc->out], vc->in, sizeof(rsp));
Bijan Mottahedeh8e5dadf2018-12-03 16:48:23 -08001380
1381 ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter);
1382 if (likely(ret == sizeof(rsp)))
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001383 vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0);
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001384 else
1385 pr_err("Faulted on virtio_scsi_ctrl_an_resp\n");
1386}
1387
1388static void
1389vhost_scsi_ctl_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
1390{
Mike Christieefd838f2020-11-09 23:33:23 -06001391 struct vhost_scsi_tpg *tpg;
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001392 union {
1393 __virtio32 type;
1394 struct virtio_scsi_ctrl_an_req an;
1395 struct virtio_scsi_ctrl_tmf_req tmf;
1396 } v_req;
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001397 struct vhost_scsi_ctx vc;
1398 size_t typ_size;
Jason Wangc1ea02f2019-05-17 00:29:52 -04001399 int ret, c = 0;
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001400
1401 mutex_lock(&vq->mutex);
1402 /*
1403 * We can handle the vq only after the endpoint is setup by calling the
1404 * VHOST_SCSI_SET_ENDPOINT ioctl.
1405 */
Eugenio Pérez247643f2020-03-31 21:27:57 +02001406 if (!vhost_vq_get_backend(vq))
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001407 goto out;
1408
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001409 memset(&vc, 0, sizeof(vc));
1410
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001411 vhost_disable_notify(&vs->dev, vq);
1412
Jason Wangc1ea02f2019-05-17 00:29:52 -04001413 do {
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001414 ret = vhost_scsi_get_desc(vs, vq, &vc);
1415 if (ret)
1416 goto err;
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001417
1418 /*
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001419 * Get the request type first in order to setup
1420 * other parameters dependent on the type.
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001421 */
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001422 vc.req = &v_req.type;
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001423 typ_size = sizeof(v_req.type);
1424
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001425 if (unlikely(!copy_from_iter_full(vc.req, typ_size,
1426 &vc.out_iter))) {
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001427 vq_err(vq, "Faulted on copy_from_iter tmf type\n");
1428 /*
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001429 * The size of the response buffer depends on the
1430 * request type and must be validated against it.
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001431 * Since the request type is not known, don't send
1432 * a response.
1433 */
1434 continue;
1435 }
1436
Michael S. Tsirkin295c1b92020-07-10 06:36:16 -04001437 switch (vhost32_to_cpu(vq, v_req.type)) {
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001438 case VIRTIO_SCSI_T_TMF:
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001439 vc.req = &v_req.tmf;
1440 vc.req_size = sizeof(struct virtio_scsi_ctrl_tmf_req);
1441 vc.rsp_size = sizeof(struct virtio_scsi_ctrl_tmf_resp);
1442 vc.lunp = &v_req.tmf.lun[0];
1443 vc.target = &v_req.tmf.lun[1];
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001444 break;
1445 case VIRTIO_SCSI_T_AN_QUERY:
1446 case VIRTIO_SCSI_T_AN_SUBSCRIBE:
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001447 vc.req = &v_req.an;
1448 vc.req_size = sizeof(struct virtio_scsi_ctrl_an_req);
1449 vc.rsp_size = sizeof(struct virtio_scsi_ctrl_an_resp);
1450 vc.lunp = &v_req.an.lun[0];
1451 vc.target = NULL;
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001452 break;
1453 default:
1454 vq_err(vq, "Unknown control request %d", v_req.type);
1455 continue;
1456 }
1457
1458 /*
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001459 * Validate the size of request and response buffers.
1460 * Check for a sane response buffer so we can report
1461 * early errors back to the guest.
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001462 */
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001463 ret = vhost_scsi_chk_size(vq, &vc);
1464 if (ret)
1465 goto err;
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001466
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001467 /*
1468 * Get the rest of the request now that its size is known.
1469 */
1470 vc.req += typ_size;
1471 vc.req_size -= typ_size;
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001472
Mike Christieefd838f2020-11-09 23:33:23 -06001473 ret = vhost_scsi_get_req(vq, &vc, &tpg);
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001474 if (ret)
1475 goto err;
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001476
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001477 if (v_req.type == VIRTIO_SCSI_T_TMF)
Mike Christieefd838f2020-11-09 23:33:23 -06001478 vhost_scsi_handle_tmf(vs, tpg, vq, &v_req.tmf, &vc);
Bijan Mottahedeh3f8ca2e2018-09-17 17:09:48 -07001479 else
1480 vhost_scsi_send_an_resp(vs, vq, &vc);
1481err:
1482 /*
1483 * ENXIO: No more requests, or read error, wait for next kick
1484 * EINVAL: Invalid response buffer, drop the request
1485 * EIO: Respond with bad target
1486 * EAGAIN: Pending request
1487 */
1488 if (ret == -ENXIO)
1489 break;
1490 else if (ret == -EIO)
1491 vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out);
Jason Wangc1ea02f2019-05-17 00:29:52 -04001492 } while (likely(!vhost_exceeds_weight(vq, ++c, 0)));
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001493out:
1494 mutex_unlock(&vq->mutex);
1495}
1496
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001497static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
1498{
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001499 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1500 poll.work);
1501 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1502
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001503 pr_debug("%s: The handling func for control queue.\n", __func__);
Bijan Mottahedeh0d02dbd2018-09-17 17:09:47 -07001504 vhost_scsi_ctl_handle_vq(vs, vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001505}
1506
Asias He683bd962013-05-06 16:38:27 +08001507static void
Mike Christie78af31c2023-06-26 18:23:00 -05001508vhost_scsi_send_evt(struct vhost_scsi *vs, struct vhost_virtqueue *vq,
1509 struct vhost_scsi_tpg *tpg, struct se_lun *lun,
1510 u32 event, u32 reason)
Asias Hea6c9af82013-04-25 15:35:21 +08001511{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001512 struct vhost_scsi_evt *evt;
Asias Hea6c9af82013-04-25 15:35:21 +08001513
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001514 evt = vhost_scsi_allocate_evt(vs, event, reason);
Asias Hea6c9af82013-04-25 15:35:21 +08001515 if (!evt)
1516 return;
1517
1518 if (tpg && lun) {
1519 /* TODO: share lun setup code with virtio-scsi.ko */
1520 /*
1521 * Note: evt->event is zeroed when we allocate it and
1522 * lun[4-7] need to be zero according to virtio-scsi spec.
1523 */
1524 evt->event.lun[0] = 0x01;
Dan Carpenter59c816c2015-02-05 10:37:33 +03001525 evt->event.lun[1] = tpg->tport_tpgt;
Asias Hea6c9af82013-04-25 15:35:21 +08001526 if (lun->unpacked_lun >= 256)
1527 evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
1528 evt->event.lun[3] = lun->unpacked_lun & 0xFF;
1529 }
1530
1531 llist_add(&evt->list, &vs->vs_event_list);
Mike Christieb1b2ce52024-03-15 19:46:59 -05001532 if (!vhost_vq_work_queue(vq, &vs->vs_event_work))
1533 vhost_scsi_complete_events(vs, true);
Asias Hea6c9af82013-04-25 15:35:21 +08001534}
1535
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001536static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
1537{
Asias Hea6c9af82013-04-25 15:35:21 +08001538 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1539 poll.work);
1540 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1541
1542 mutex_lock(&vq->mutex);
Eugenio Pérez247643f2020-03-31 21:27:57 +02001543 if (!vhost_vq_get_backend(vq))
Asias Hea6c9af82013-04-25 15:35:21 +08001544 goto out;
1545
1546 if (vs->vs_events_missed)
Mike Christie78af31c2023-06-26 18:23:00 -05001547 vhost_scsi_send_evt(vs, vq, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT,
1548 0);
Asias Hea6c9af82013-04-25 15:35:21 +08001549out:
1550 mutex_unlock(&vq->mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001551}
1552
1553static void vhost_scsi_handle_kick(struct vhost_work *work)
1554{
1555 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1556 poll.work);
1557 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1558
Asias He1b7f3902013-02-06 13:20:59 +08001559 vhost_scsi_handle_vq(vs, vq);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001560}
1561
Michael S. Tsirkin3dfbff32013-04-28 15:38:52 +03001562/* Callers must hold dev mutex */
Asias He4f7f46d2013-04-03 14:17:37 +08001563static void vhost_scsi_flush(struct vhost_scsi *vs)
1564{
1565 int i;
1566
Asias Hef2f0173d2013-04-27 11:16:49 +08001567 /* Init new inflight and remember the old inflight */
Mike Christief49c2222022-07-07 22:05:25 -05001568 vhost_scsi_init_inflight(vs, vs->old_inflight);
Asias Hef2f0173d2013-04-27 11:16:49 +08001569
1570 /*
1571 * The inflight->kref was initialized to 1. We decrement it here to
1572 * indicate the start of the flush operation so that it will reach 0
1573 * when all the reqs are finished.
1574 */
Mike Christief49c2222022-07-07 22:05:25 -05001575 for (i = 0; i < vs->dev.nvqs; i++)
1576 kref_put(&vs->old_inflight[i]->kref, vhost_scsi_done_inflight);
Asias Hef2f0173d2013-04-27 11:16:49 +08001577
1578 /* Flush both the vhost poll and vhost work */
Mike Christieb2ffa4072022-05-17 13:08:50 -05001579 vhost_dev_flush(&vs->dev);
Asias Hef2f0173d2013-04-27 11:16:49 +08001580
1581 /* Wait for all reqs issued before the flush to be finished */
Mike Christief49c2222022-07-07 22:05:25 -05001582 for (i = 0; i < vs->dev.nvqs; i++)
1583 wait_for_completion(&vs->old_inflight[i]->comp);
Asias He4f7f46d2013-04-03 14:17:37 +08001584}
1585
Mike Christie25b98b62020-11-09 23:33:20 -06001586static void vhost_scsi_destroy_vq_cmds(struct vhost_virtqueue *vq)
1587{
1588 struct vhost_scsi_virtqueue *svq = container_of(vq,
1589 struct vhost_scsi_virtqueue, vq);
1590 struct vhost_scsi_cmd *tv_cmd;
1591 unsigned int i;
1592
1593 if (!svq->scsi_cmds)
1594 return;
1595
1596 for (i = 0; i < svq->max_cmds; i++) {
1597 tv_cmd = &svq->scsi_cmds[i];
1598
1599 kfree(tv_cmd->tvc_sgl);
1600 kfree(tv_cmd->tvc_prot_sgl);
1601 kfree(tv_cmd->tvc_upages);
Jason Wang6dd88fd2023-01-19 15:36:47 +08001602 kfree(tv_cmd->tvc_resp_iov);
Mike Christie25b98b62020-11-09 23:33:20 -06001603 }
1604
1605 sbitmap_free(&svq->scsi_tags);
1606 kfree(svq->scsi_cmds);
1607 svq->scsi_cmds = NULL;
1608}
1609
1610static int vhost_scsi_setup_vq_cmds(struct vhost_virtqueue *vq, int max_cmds)
1611{
1612 struct vhost_scsi_virtqueue *svq = container_of(vq,
1613 struct vhost_scsi_virtqueue, vq);
1614 struct vhost_scsi_cmd *tv_cmd;
1615 unsigned int i;
1616
1617 if (svq->scsi_cmds)
1618 return 0;
1619
1620 if (sbitmap_init_node(&svq->scsi_tags, max_cmds, -1, GFP_KERNEL,
Ming Leic548e622021-01-22 10:33:08 +08001621 NUMA_NO_NODE, false, true))
Mike Christie25b98b62020-11-09 23:33:20 -06001622 return -ENOMEM;
1623 svq->max_cmds = max_cmds;
1624
1625 svq->scsi_cmds = kcalloc(max_cmds, sizeof(*tv_cmd), GFP_KERNEL);
1626 if (!svq->scsi_cmds) {
1627 sbitmap_free(&svq->scsi_tags);
1628 return -ENOMEM;
1629 }
1630
1631 for (i = 0; i < max_cmds; i++) {
1632 tv_cmd = &svq->scsi_cmds[i];
1633
1634 tv_cmd->tvc_sgl = kcalloc(VHOST_SCSI_PREALLOC_SGLS,
1635 sizeof(struct scatterlist),
1636 GFP_KERNEL);
1637 if (!tv_cmd->tvc_sgl) {
1638 pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
1639 goto out;
1640 }
1641
1642 tv_cmd->tvc_upages = kcalloc(VHOST_SCSI_PREALLOC_UPAGES,
1643 sizeof(struct page *),
1644 GFP_KERNEL);
1645 if (!tv_cmd->tvc_upages) {
1646 pr_err("Unable to allocate tv_cmd->tvc_upages\n");
1647 goto out;
1648 }
1649
Jason Wang6dd88fd2023-01-19 15:36:47 +08001650 tv_cmd->tvc_resp_iov = kcalloc(UIO_MAXIOV,
1651 sizeof(struct iovec),
1652 GFP_KERNEL);
1653 if (!tv_cmd->tvc_resp_iov) {
1654 pr_err("Unable to allocate tv_cmd->tvc_resp_iov\n");
1655 goto out;
1656 }
1657
Mike Christie25b98b62020-11-09 23:33:20 -06001658 tv_cmd->tvc_prot_sgl = kcalloc(VHOST_SCSI_PREALLOC_PROT_SGLS,
1659 sizeof(struct scatterlist),
1660 GFP_KERNEL);
1661 if (!tv_cmd->tvc_prot_sgl) {
1662 pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
1663 goto out;
1664 }
1665 }
1666 return 0;
1667out:
1668 vhost_scsi_destroy_vq_cmds(vq);
1669 return -ENOMEM;
1670}
1671
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001672/*
1673 * Called from vhost_scsi_ioctl() context to walk the list of available
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001674 * vhost_scsi_tpg with an active struct vhost_scsi_nexus
Asias Hef2b7daf2013-04-25 15:35:20 +08001675 *
1676 * The lock nesting rule is:
Mike Christiebea273c2023-03-20 21:06:24 -05001677 * vs->dev.mutex -> vhost_scsi_mutex -> tpg->tv_tpg_mutex -> vq->mutex
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001678 */
Asias He683bd962013-05-06 16:38:27 +08001679static int
1680vhost_scsi_set_endpoint(struct vhost_scsi *vs,
1681 struct vhost_scsi_target *t)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001682{
Nicholas Bellingerab8edab2014-10-08 06:19:20 +00001683 struct se_portal_group *se_tpg;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001684 struct vhost_scsi_tport *tv_tport;
1685 struct vhost_scsi_tpg *tpg;
1686 struct vhost_scsi_tpg **vs_tpg;
Asias He4f7f46d2013-04-03 14:17:37 +08001687 struct vhost_virtqueue *vq;
1688 int index, ret, i, len;
Asias He67e18cf2013-02-05 12:31:57 +08001689 bool match = false;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001690
1691 mutex_lock(&vs->dev.mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001692
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001693 /* Verify that ring has been setup correctly. */
1694 for (index = 0; index < vs->dev.nvqs; ++index) {
1695 /* Verify that ring has been setup correctly. */
Asias He3ab2e422013-04-27 11:16:48 +08001696 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
Asias Hef2b7daf2013-04-25 15:35:20 +08001697 ret = -EFAULT;
1698 goto out;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001699 }
1700 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001701
Asias He4f7f46d2013-04-03 14:17:37 +08001702 len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
1703 vs_tpg = kzalloc(len, GFP_KERNEL);
1704 if (!vs_tpg) {
Asias Hef2b7daf2013-04-25 15:35:20 +08001705 ret = -ENOMEM;
1706 goto out;
Asias He4f7f46d2013-04-03 14:17:37 +08001707 }
1708 if (vs->vs_tpg)
1709 memcpy(vs_tpg, vs->vs_tpg, len);
1710
Mike Christiebea273c2023-03-20 21:06:24 -05001711 mutex_lock(&vhost_scsi_mutex);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001712 list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) {
Asias He98718312013-05-06 16:38:28 +08001713 mutex_lock(&tpg->tv_tpg_mutex);
1714 if (!tpg->tpg_nexus) {
1715 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001716 continue;
1717 }
Asias He98718312013-05-06 16:38:28 +08001718 if (tpg->tv_tpg_vhost_count != 0) {
1719 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001720 continue;
1721 }
Asias He98718312013-05-06 16:38:28 +08001722 tv_tport = tpg->tport;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001723
Asias He67e18cf2013-02-05 12:31:57 +08001724 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
Asias He98718312013-05-06 16:38:28 +08001725 if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
Asias He98718312013-05-06 16:38:28 +08001726 mutex_unlock(&tpg->tv_tpg_mutex);
Mike Christiebea273c2023-03-20 21:06:24 -05001727 mutex_unlock(&vhost_scsi_mutex);
Asias Hef2b7daf2013-04-25 15:35:20 +08001728 ret = -EEXIST;
Mike Christie25b98b62020-11-09 23:33:20 -06001729 goto undepend;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001730 }
Nicholas Bellingerab8edab2014-10-08 06:19:20 +00001731 /*
1732 * In order to ensure individual vhost-scsi configfs
1733 * groups cannot be removed while in use by vhost ioctl,
1734 * go ahead and take an explicit se_tpg->tpg_group.cg_item
1735 * dependency now.
1736 */
1737 se_tpg = &tpg->se_tpg;
Christoph Hellwigd588cf82015-05-03 08:50:52 +02001738 ret = target_depend_item(&se_tpg->tpg_group.cg_item);
Nicholas Bellingerab8edab2014-10-08 06:19:20 +00001739 if (ret) {
wangyana691ffb2018-12-13 09:10:14 +08001740 pr_warn("target_depend_item() failed: %d\n", ret);
Nicholas Bellingerab8edab2014-10-08 06:19:20 +00001741 mutex_unlock(&tpg->tv_tpg_mutex);
Mike Christiebea273c2023-03-20 21:06:24 -05001742 mutex_unlock(&vhost_scsi_mutex);
Mike Christie25b98b62020-11-09 23:33:20 -06001743 goto undepend;
Nicholas Bellingerab8edab2014-10-08 06:19:20 +00001744 }
Asias He98718312013-05-06 16:38:28 +08001745 tpg->tv_tpg_vhost_count++;
1746 tpg->vhost_scsi = vs;
1747 vs_tpg[tpg->tport_tpgt] = tpg;
Asias He67e18cf2013-02-05 12:31:57 +08001748 match = true;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001749 }
Asias He98718312013-05-06 16:38:28 +08001750 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001751 }
Mike Christiebea273c2023-03-20 21:06:24 -05001752 mutex_unlock(&vhost_scsi_mutex);
Asias He67e18cf2013-02-05 12:31:57 +08001753
1754 if (match) {
1755 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1756 sizeof(vs->vs_vhost_wwpn));
Mike Christie25b98b62020-11-09 23:33:20 -06001757
Mike Christief49c2222022-07-07 22:05:25 -05001758 for (i = VHOST_SCSI_VQ_IO; i < vs->dev.nvqs; i++) {
Mike Christie25b98b62020-11-09 23:33:20 -06001759 vq = &vs->vqs[i].vq;
1760 if (!vhost_vq_is_setup(vq))
1761 continue;
1762
Zhang Changzhong2e1139d2020-12-04 16:43:30 +08001763 ret = vhost_scsi_setup_vq_cmds(vq, vq->num);
1764 if (ret)
Mike Christie25b98b62020-11-09 23:33:20 -06001765 goto destroy_vq_cmds;
1766 }
1767
Mike Christief49c2222022-07-07 22:05:25 -05001768 for (i = 0; i < vs->dev.nvqs; i++) {
Asias He3ab2e422013-04-27 11:16:48 +08001769 vq = &vs->vqs[i].vq;
Asias He4f7f46d2013-04-03 14:17:37 +08001770 mutex_lock(&vq->mutex);
Eugenio Pérez247643f2020-03-31 21:27:57 +02001771 vhost_vq_set_backend(vq, vs_tpg);
Greg Kurz80f7d032016-02-16 15:59:44 +01001772 vhost_vq_init_access(vq);
Asias He4f7f46d2013-04-03 14:17:37 +08001773 mutex_unlock(&vq->mutex);
1774 }
Asias He67e18cf2013-02-05 12:31:57 +08001775 ret = 0;
1776 } else {
1777 ret = -EEXIST;
1778 }
1779
Asias He4f7f46d2013-04-03 14:17:37 +08001780 /*
1781 * Act as synchronize_rcu to make sure access to
1782 * old vs->vs_tpg is finished.
1783 */
1784 vhost_scsi_flush(vs);
1785 kfree(vs->vs_tpg);
1786 vs->vs_tpg = vs_tpg;
Mike Christie25b98b62020-11-09 23:33:20 -06001787 goto out;
Asias He4f7f46d2013-04-03 14:17:37 +08001788
Mike Christie25b98b62020-11-09 23:33:20 -06001789destroy_vq_cmds:
1790 for (i--; i >= VHOST_SCSI_VQ_IO; i--) {
1791 if (!vhost_vq_get_backend(&vs->vqs[i].vq))
1792 vhost_scsi_destroy_vq_cmds(&vs->vqs[i].vq);
1793 }
1794undepend:
1795 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1796 tpg = vs_tpg[i];
1797 if (tpg) {
Mike Christiee508efc2023-03-20 21:06:18 -05001798 mutex_lock(&tpg->tv_tpg_mutex);
1799 tpg->vhost_scsi = NULL;
Mike Christie25b98b62020-11-09 23:33:20 -06001800 tpg->tv_tpg_vhost_count--;
Mike Christiee508efc2023-03-20 21:06:18 -05001801 mutex_unlock(&tpg->tv_tpg_mutex);
Mike Christie25b98b62020-11-09 23:33:20 -06001802 target_undepend_item(&tpg->se_tpg.tpg_group.cg_item);
1803 }
1804 }
1805 kfree(vs_tpg);
Asias Hef2b7daf2013-04-25 15:35:20 +08001806out:
Asias He67e18cf2013-02-05 12:31:57 +08001807 mutex_unlock(&vs->dev.mutex);
1808 return ret;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001809}
1810
Asias He683bd962013-05-06 16:38:27 +08001811static int
1812vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
1813 struct vhost_scsi_target *t)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001814{
Nicholas Bellingerab8edab2014-10-08 06:19:20 +00001815 struct se_portal_group *se_tpg;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001816 struct vhost_scsi_tport *tv_tport;
1817 struct vhost_scsi_tpg *tpg;
Asias He4f7f46d2013-04-03 14:17:37 +08001818 struct vhost_virtqueue *vq;
1819 bool match = false;
Asias He67e18cf2013-02-05 12:31:57 +08001820 int index, ret, i;
1821 u8 target;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001822
1823 mutex_lock(&vs->dev.mutex);
1824 /* Verify that ring has been setup correctly. */
1825 for (index = 0; index < vs->dev.nvqs; ++index) {
Asias He3ab2e422013-04-27 11:16:48 +08001826 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001827 ret = -EFAULT;
Asias He038e0af42013-03-15 09:14:05 +08001828 goto err_dev;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001829 }
1830 }
Asias He4f7f46d2013-04-03 14:17:37 +08001831
1832 if (!vs->vs_tpg) {
Asias Hef2b7daf2013-04-25 15:35:20 +08001833 ret = 0;
1834 goto err_dev;
Asias He4f7f46d2013-04-03 14:17:37 +08001835 }
1836
Asias He67e18cf2013-02-05 12:31:57 +08001837 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1838 target = i;
Asias He98718312013-05-06 16:38:28 +08001839 tpg = vs->vs_tpg[target];
1840 if (!tpg)
Asias He67e18cf2013-02-05 12:31:57 +08001841 continue;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001842
Asias He98718312013-05-06 16:38:28 +08001843 tv_tport = tpg->tport;
Asias He67e18cf2013-02-05 12:31:57 +08001844 if (!tv_tport) {
1845 ret = -ENODEV;
Mike Christie9a10cb4d2023-03-20 21:06:20 -05001846 goto err_dev;
Asias He67e18cf2013-02-05 12:31:57 +08001847 }
1848
1849 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
Asias He98718312013-05-06 16:38:28 +08001850 pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
Asias He67e18cf2013-02-05 12:31:57 +08001851 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
Asias He98718312013-05-06 16:38:28 +08001852 tv_tport->tport_name, tpg->tport_tpgt,
Asias He67e18cf2013-02-05 12:31:57 +08001853 t->vhost_wwpn, t->vhost_tpgt);
1854 ret = -EINVAL;
Mike Christie9a10cb4d2023-03-20 21:06:20 -05001855 goto err_dev;
Asias He67e18cf2013-02-05 12:31:57 +08001856 }
Mike Christie9a10cb4d2023-03-20 21:06:20 -05001857 match = true;
1858 }
1859 if (!match)
1860 goto free_vs_tpg;
1861
1862 /* Prevent new cmds from starting and accessing the tpgs/sessions */
1863 for (i = 0; i < vs->dev.nvqs; i++) {
1864 vq = &vs->vqs[i].vq;
1865 mutex_lock(&vq->mutex);
1866 vhost_vq_set_backend(vq, NULL);
1867 mutex_unlock(&vq->mutex);
1868 }
1869 /* Make sure cmds are not running before tearing them down. */
1870 vhost_scsi_flush(vs);
1871
1872 for (i = 0; i < vs->dev.nvqs; i++) {
1873 vq = &vs->vqs[i].vq;
1874 vhost_scsi_destroy_vq_cmds(vq);
1875 }
1876
1877 /*
1878 * We can now release our hold on the tpg and sessions and userspace
1879 * can free them after this point.
1880 */
1881 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1882 target = i;
1883 tpg = vs->vs_tpg[target];
1884 if (!tpg)
1885 continue;
1886
1887 mutex_lock(&tpg->tv_tpg_mutex);
1888
Asias He98718312013-05-06 16:38:28 +08001889 tpg->tv_tpg_vhost_count--;
1890 tpg->vhost_scsi = NULL;
Asias He67e18cf2013-02-05 12:31:57 +08001891 vs->vs_tpg[target] = NULL;
Mike Christie9a10cb4d2023-03-20 21:06:20 -05001892
Asias He98718312013-05-06 16:38:28 +08001893 mutex_unlock(&tpg->tv_tpg_mutex);
Mike Christie9a10cb4d2023-03-20 21:06:20 -05001894
Nicholas Bellingerab8edab2014-10-08 06:19:20 +00001895 se_tpg = &tpg->se_tpg;
Christoph Hellwigd588cf82015-05-03 08:50:52 +02001896 target_undepend_item(&se_tpg->tpg_group.cg_item);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001897 }
Mike Christied60146c2021-05-25 12:47:31 -05001898
Mike Christie9a10cb4d2023-03-20 21:06:20 -05001899free_vs_tpg:
Asias He4f7f46d2013-04-03 14:17:37 +08001900 /*
1901 * Act as synchronize_rcu to make sure access to
1902 * old vs->vs_tpg is finished.
1903 */
1904 vhost_scsi_flush(vs);
1905 kfree(vs->vs_tpg);
1906 vs->vs_tpg = NULL;
Asias Hea6c9af82013-04-25 15:35:21 +08001907 WARN_ON(vs->vs_events_nr);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001908 mutex_unlock(&vs->dev.mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001909 return 0;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001910
Asias He038e0af42013-03-15 09:14:05 +08001911err_dev:
Nicholas Bellinger101998f2012-07-30 13:30:00 -07001912 mutex_unlock(&vs->dev.mutex);
1913 return ret;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001914}
1915
Asias He4f7f46d2013-04-03 14:17:37 +08001916static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1917{
Michael S. Tsirkinea16c512014-06-05 15:20:23 +03001918 struct vhost_virtqueue *vq;
1919 int i;
1920
Asias He4f7f46d2013-04-03 14:17:37 +08001921 if (features & ~VHOST_SCSI_FEATURES)
1922 return -EOPNOTSUPP;
1923
1924 mutex_lock(&vs->dev.mutex);
1925 if ((features & (1 << VHOST_F_LOG_ALL)) &&
1926 !vhost_log_access_ok(&vs->dev)) {
1927 mutex_unlock(&vs->dev.mutex);
1928 return -EFAULT;
1929 }
Michael S. Tsirkinea16c512014-06-05 15:20:23 +03001930
Mike Christief49c2222022-07-07 22:05:25 -05001931 for (i = 0; i < vs->dev.nvqs; i++) {
Michael S. Tsirkinea16c512014-06-05 15:20:23 +03001932 vq = &vs->vqs[i].vq;
1933 mutex_lock(&vq->mutex);
1934 vq->acked_features = features;
1935 mutex_unlock(&vq->mutex);
1936 }
Asias He4f7f46d2013-04-03 14:17:37 +08001937 mutex_unlock(&vs->dev.mutex);
1938 return 0;
1939}
1940
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001941static int vhost_scsi_open(struct inode *inode, struct file *f)
1942{
Mike Christie48ae70d2023-06-26 18:22:59 -05001943 struct vhost_scsi_virtqueue *svq;
Asias Hec7289312013-05-06 16:38:26 +08001944 struct vhost_scsi *vs;
Asias He3ab2e422013-04-27 11:16:48 +08001945 struct vhost_virtqueue **vqs;
Mike Christief49c2222022-07-07 22:05:25 -05001946 int r = -ENOMEM, i, nvqs = vhost_scsi_max_io_vqs;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001947
Dongli Zhang489084d2021-01-23 00:08:53 -08001948 vs = kvzalloc(sizeof(*vs), GFP_KERNEL);
1949 if (!vs)
1950 goto err_vs;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001951
Mike Christief49c2222022-07-07 22:05:25 -05001952 if (nvqs > VHOST_SCSI_MAX_IO_VQ) {
1953 pr_err("Invalid max_io_vqs of %d. Using %d.\n", nvqs,
1954 VHOST_SCSI_MAX_IO_VQ);
1955 nvqs = VHOST_SCSI_MAX_IO_VQ;
1956 } else if (nvqs == 0) {
1957 pr_err("Invalid max_io_vqs of %d. Using 1.\n", nvqs);
1958 nvqs = 1;
1959 }
1960 nvqs += VHOST_SCSI_VQ_IO;
1961
Mike Christief49c2222022-07-07 22:05:25 -05001962 vs->old_inflight = kmalloc_array(nvqs, sizeof(*vs->old_inflight),
1963 GFP_KERNEL | __GFP_ZERO);
1964 if (!vs->old_inflight)
1965 goto err_inflight;
1966
1967 vs->vqs = kmalloc_array(nvqs, sizeof(*vs->vqs),
1968 GFP_KERNEL | __GFP_ZERO);
1969 if (!vs->vqs)
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03001970 goto err_vqs;
Asias He3ab2e422013-04-27 11:16:48 +08001971
Mike Christief49c2222022-07-07 22:05:25 -05001972 vqs = kmalloc_array(nvqs, sizeof(*vqs), GFP_KERNEL);
1973 if (!vqs)
1974 goto err_local_vqs;
1975
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001976 vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);
Asias Hea6c9af82013-04-25 15:35:21 +08001977
Asias Hec7289312013-05-06 16:38:26 +08001978 vs->vs_events_nr = 0;
1979 vs->vs_events_missed = false;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07001980
Asias Hec7289312013-05-06 16:38:26 +08001981 vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
1982 vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1983 vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1984 vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
Mike Christief49c2222022-07-07 22:05:25 -05001985 for (i = VHOST_SCSI_VQ_IO; i < nvqs; i++) {
Mike Christie48ae70d2023-06-26 18:22:59 -05001986 svq = &vs->vqs[i];
1987
1988 vqs[i] = &svq->vq;
1989 svq->vs = vs;
1990 init_llist_head(&svq->completion_list);
1991 vhost_work_init(&svq->completion_work,
1992 vhost_scsi_complete_cmd_work);
1993 svq->vq.handle_kick = vhost_scsi_handle_kick;
Asias He3ab2e422013-04-27 11:16:48 +08001994 }
Mike Christief49c2222022-07-07 22:05:25 -05001995 vhost_dev_init(&vs->dev, vqs, nvqs, UIO_MAXIOV,
Jason Wang01fcb1c2020-05-29 16:02:58 +08001996 VHOST_SCSI_WEIGHT, 0, true, NULL);
Asias Hef2f0173d2013-04-27 11:16:49 +08001997
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08001998 vhost_scsi_init_inflight(vs, NULL);
Asias Hef2f0173d2013-04-27 11:16:49 +08001999
Asias Hec7289312013-05-06 16:38:26 +08002000 f->private_data = vs;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002001 return 0;
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03002002
Mike Christief49c2222022-07-07 22:05:25 -05002003err_local_vqs:
2004 kfree(vs->vqs);
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03002005err_vqs:
Mike Christief49c2222022-07-07 22:05:25 -05002006 kfree(vs->old_inflight);
2007err_inflight:
Michael S. Tsirkin68404442014-06-12 19:00:01 +03002008 kvfree(vs);
Michael S. Tsirkin595cb752013-09-17 09:30:34 +03002009err_vs:
2010 return r;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002011}
2012
2013static int vhost_scsi_release(struct inode *inode, struct file *f)
2014{
Asias Hec7289312013-05-06 16:38:26 +08002015 struct vhost_scsi *vs = f->private_data;
Asias He67e18cf2013-02-05 12:31:57 +08002016 struct vhost_scsi_target t;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002017
Asias Hec7289312013-05-06 16:38:26 +08002018 mutex_lock(&vs->dev.mutex);
2019 memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
2020 mutex_unlock(&vs->dev.mutex);
2021 vhost_scsi_clear_endpoint(vs, &t);
2022 vhost_dev_stop(&vs->dev);
夷则(Caspar)f6f93f72017-12-25 00:08:58 +08002023 vhost_dev_cleanup(&vs->dev);
Asias Hec7289312013-05-06 16:38:26 +08002024 kfree(vs->dev.vqs);
Mike Christief49c2222022-07-07 22:05:25 -05002025 kfree(vs->vqs);
2026 kfree(vs->old_inflight);
Michael S. Tsirkin68404442014-06-12 19:00:01 +03002027 kvfree(vs);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002028 return 0;
2029}
2030
Asias He683bd962013-05-06 16:38:27 +08002031static long
2032vhost_scsi_ioctl(struct file *f,
2033 unsigned int ioctl,
2034 unsigned long arg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002035{
2036 struct vhost_scsi *vs = f->private_data;
2037 struct vhost_scsi_target backend;
2038 void __user *argp = (void __user *)arg;
2039 u64 __user *featurep = argp;
Asias He11c63412013-04-25 15:35:22 +08002040 u32 __user *eventsp = argp;
2041 u32 events_missed;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002042 u64 features;
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002043 int r, abi_version = VHOST_SCSI_ABI_VERSION;
Asias He3ab2e422013-04-27 11:16:48 +08002044 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002045
2046 switch (ioctl) {
2047 case VHOST_SCSI_SET_ENDPOINT:
2048 if (copy_from_user(&backend, argp, sizeof backend))
2049 return -EFAULT;
Michael S. Tsirkin6de71452012-08-18 15:44:09 -07002050 if (backend.reserved != 0)
2051 return -EOPNOTSUPP;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002052
2053 return vhost_scsi_set_endpoint(vs, &backend);
2054 case VHOST_SCSI_CLEAR_ENDPOINT:
2055 if (copy_from_user(&backend, argp, sizeof backend))
2056 return -EFAULT;
Michael S. Tsirkin6de71452012-08-18 15:44:09 -07002057 if (backend.reserved != 0)
2058 return -EOPNOTSUPP;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002059
2060 return vhost_scsi_clear_endpoint(vs, &backend);
2061 case VHOST_SCSI_GET_ABI_VERSION:
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002062 if (copy_to_user(argp, &abi_version, sizeof abi_version))
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002063 return -EFAULT;
2064 return 0;
Asias He11c63412013-04-25 15:35:22 +08002065 case VHOST_SCSI_SET_EVENTS_MISSED:
2066 if (get_user(events_missed, eventsp))
2067 return -EFAULT;
2068 mutex_lock(&vq->mutex);
2069 vs->vs_events_missed = events_missed;
2070 mutex_unlock(&vq->mutex);
2071 return 0;
2072 case VHOST_SCSI_GET_EVENTS_MISSED:
2073 mutex_lock(&vq->mutex);
2074 events_missed = vs->vs_events_missed;
2075 mutex_unlock(&vq->mutex);
2076 if (put_user(events_missed, eventsp))
2077 return -EFAULT;
2078 return 0;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002079 case VHOST_GET_FEATURES:
Nicholas Bellinger5dade712013-03-27 17:23:41 -07002080 features = VHOST_SCSI_FEATURES;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002081 if (copy_to_user(featurep, &features, sizeof features))
2082 return -EFAULT;
2083 return 0;
2084 case VHOST_SET_FEATURES:
2085 if (copy_from_user(&features, featurep, sizeof features))
2086 return -EFAULT;
2087 return vhost_scsi_set_features(vs, features);
Mike Christied74b55e2023-06-26 18:23:06 -05002088 case VHOST_NEW_WORKER:
2089 case VHOST_FREE_WORKER:
2090 case VHOST_ATTACH_VRING_WORKER:
2091 case VHOST_GET_VRING_WORKER:
2092 mutex_lock(&vs->dev.mutex);
2093 r = vhost_worker_ioctl(&vs->dev, ioctl, argp);
2094 mutex_unlock(&vs->dev.mutex);
2095 return r;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002096 default:
2097 mutex_lock(&vs->dev.mutex);
Michael S. Tsirkin935cdee2012-12-06 14:03:34 +02002098 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
2099 /* TODO: flush backend after dev ioctl. */
2100 if (r == -ENOIOCTLCMD)
2101 r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002102 mutex_unlock(&vs->dev.mutex);
2103 return r;
2104 }
2105}
2106
2107static const struct file_operations vhost_scsi_fops = {
2108 .owner = THIS_MODULE,
2109 .release = vhost_scsi_release,
2110 .unlocked_ioctl = vhost_scsi_ioctl,
Arnd Bergmann407e9ef2018-09-11 17:23:00 +02002111 .compat_ioctl = compat_ptr_ioctl,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002112 .open = vhost_scsi_open,
2113 .llseek = noop_llseek,
2114};
2115
2116static struct miscdevice vhost_scsi_misc = {
2117 MISC_DYNAMIC_MINOR,
2118 "vhost-scsi",
2119 &vhost_scsi_fops,
2120};
2121
2122static int __init vhost_scsi_register(void)
2123{
2124 return misc_register(&vhost_scsi_misc);
2125}
2126
Greg Kroah-Hartmanf368ed62015-07-30 15:59:57 -07002127static void vhost_scsi_deregister(void)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002128{
Greg Kroah-Hartmanf368ed62015-07-30 15:59:57 -07002129 misc_deregister(&vhost_scsi_misc);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002130}
2131
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002132static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002133{
2134 switch (tport->tport_proto_id) {
2135 case SCSI_PROTOCOL_SAS:
2136 return "SAS";
2137 case SCSI_PROTOCOL_FCP:
2138 return "FCP";
2139 case SCSI_PROTOCOL_ISCSI:
2140 return "iSCSI";
2141 default:
2142 break;
2143 }
2144
2145 return "Unknown";
2146}
2147
Asias He683bd962013-05-06 16:38:27 +08002148static void
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002149vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg,
Asias He683bd962013-05-06 16:38:27 +08002150 struct se_lun *lun, bool plug)
Asias Hea6c9af82013-04-25 15:35:21 +08002151{
2152
2153 struct vhost_scsi *vs = tpg->vhost_scsi;
2154 struct vhost_virtqueue *vq;
2155 u32 reason;
2156
2157 if (!vs)
2158 return;
2159
Asias Hea6c9af82013-04-25 15:35:21 +08002160 if (plug)
2161 reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
2162 else
2163 reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
2164
Asias He3ab2e422013-04-27 11:16:48 +08002165 vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
Asias Hea6c9af82013-04-25 15:35:21 +08002166 mutex_lock(&vq->mutex);
Mike Christieced9eb32023-03-20 21:06:22 -05002167 /*
2168 * We can't queue events if the backend has been cleared, because
2169 * we could end up queueing an event after the flush.
2170 */
2171 if (!vhost_vq_get_backend(vq))
2172 goto unlock;
2173
Michael S. Tsirkinea16c512014-06-05 15:20:23 +03002174 if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG))
Mike Christie78af31c2023-06-26 18:23:00 -05002175 vhost_scsi_send_evt(vs, vq, tpg, lun,
Michael S. Tsirkinea16c512014-06-05 15:20:23 +03002176 VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
Mike Christieced9eb32023-03-20 21:06:22 -05002177unlock:
Asias Hea6c9af82013-04-25 15:35:21 +08002178 mutex_unlock(&vq->mutex);
Asias Hea6c9af82013-04-25 15:35:21 +08002179}
2180
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002181static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
Asias Hea6c9af82013-04-25 15:35:21 +08002182{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002183 vhost_scsi_do_plug(tpg, lun, true);
Asias Hea6c9af82013-04-25 15:35:21 +08002184}
2185
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002186static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
Asias Hea6c9af82013-04-25 15:35:21 +08002187{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002188 vhost_scsi_do_plug(tpg, lun, false);
Asias Hea6c9af82013-04-25 15:35:21 +08002189}
2190
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002191static int vhost_scsi_port_link(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +08002192 struct se_lun *lun)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002193{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002194 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2195 struct vhost_scsi_tpg, se_tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002196
Asias He98718312013-05-06 16:38:28 +08002197 mutex_lock(&tpg->tv_tpg_mutex);
2198 tpg->tv_tpg_port_count++;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002199 vhost_scsi_hotplug(tpg, lun);
Mike Christief5ed6f9e2023-03-20 21:06:23 -05002200 mutex_unlock(&tpg->tv_tpg_mutex);
Asias Hea6c9af82013-04-25 15:35:21 +08002201
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002202 return 0;
2203}
2204
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002205static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
Asias He683bd962013-05-06 16:38:27 +08002206 struct se_lun *lun)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002207{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002208 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2209 struct vhost_scsi_tpg, se_tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002210
Asias He98718312013-05-06 16:38:28 +08002211 mutex_lock(&tpg->tv_tpg_mutex);
2212 tpg->tv_tpg_port_count--;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002213 vhost_scsi_hotunplug(tpg, lun);
Mike Christief5ed6f9e2023-03-20 21:06:23 -05002214 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002215}
2216
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002217static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store(
2218 struct config_item *item, const char *page, size_t count)
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -07002219{
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002220 struct se_portal_group *se_tpg = attrib_to_tpg(item);
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -07002221 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2222 struct vhost_scsi_tpg, se_tpg);
2223 unsigned long val;
2224 int ret = kstrtoul(page, 0, &val);
2225
2226 if (ret) {
2227 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
2228 return ret;
2229 }
2230 if (val != 0 && val != 1 && val != 3) {
2231 pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val);
2232 return -EINVAL;
2233 }
2234 tpg->tv_fabric_prot_type = val;
2235
2236 return count;
2237}
2238
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002239static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show(
2240 struct config_item *item, char *page)
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -07002241{
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002242 struct se_portal_group *se_tpg = attrib_to_tpg(item);
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -07002243 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2244 struct vhost_scsi_tpg, se_tpg);
2245
Bo Liub3d4f022023-01-29 04:11:45 -05002246 return sysfs_emit(page, "%d\n", tpg->tv_fabric_prot_type);
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -07002247}
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002248
2249CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type);
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -07002250
2251static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = {
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002252 &vhost_scsi_tpg_attrib_attr_fabric_prot_type,
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -07002253 NULL,
2254};
2255
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002256static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
Asias He683bd962013-05-06 16:38:27 +08002257 const char *name)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002258{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002259 struct vhost_scsi_nexus *tv_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002260
Asias He98718312013-05-06 16:38:28 +08002261 mutex_lock(&tpg->tv_tpg_mutex);
2262 if (tpg->tpg_nexus) {
2263 mutex_unlock(&tpg->tv_tpg_mutex);
2264 pr_debug("tpg->tpg_nexus already exists\n");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002265 return -EEXIST;
2266 }
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002267
Markus Elfring473f0b12017-05-20 13:48:44 +02002268 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002269 if (!tv_nexus) {
Asias He98718312013-05-06 16:38:28 +08002270 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002271 pr_err("Unable to allocate struct vhost_scsi_nexus\n");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002272 return -ENOMEM;
2273 }
2274 /*
Nicholas Bellinger65ea7892016-01-09 05:47:55 -08002275 * Since we are running in 'demo mode' this call with generate a
2276 * struct se_node_acl for the vhost_scsi struct se_portal_group with
2277 * the SCSI Initiator port name of the passed configfs group 'name'.
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002278 */
Mike Christie25b98b62020-11-09 23:33:20 -06002279 tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, 0, 0,
Nicholas Bellinger65ea7892016-01-09 05:47:55 -08002280 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
Mike Christie25b98b62020-11-09 23:33:20 -06002281 (unsigned char *)name, tv_nexus, NULL);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002282 if (IS_ERR(tv_nexus->tvn_se_sess)) {
Asias He98718312013-05-06 16:38:28 +08002283 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002284 kfree(tv_nexus);
2285 return -ENOMEM;
2286 }
Asias He98718312013-05-06 16:38:28 +08002287 tpg->tpg_nexus = tv_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002288
Asias He98718312013-05-06 16:38:28 +08002289 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002290 return 0;
2291}
2292
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002293static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002294{
2295 struct se_session *se_sess;
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002296 struct vhost_scsi_nexus *tv_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002297
2298 mutex_lock(&tpg->tv_tpg_mutex);
2299 tv_nexus = tpg->tpg_nexus;
2300 if (!tv_nexus) {
2301 mutex_unlock(&tpg->tv_tpg_mutex);
2302 return -ENODEV;
2303 }
2304
2305 se_sess = tv_nexus->tvn_se_sess;
2306 if (!se_sess) {
2307 mutex_unlock(&tpg->tv_tpg_mutex);
2308 return -ENODEV;
2309 }
2310
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002311 if (tpg->tv_tpg_port_count != 0) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002312 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002313 pr_err("Unable to remove TCM_vhost I_T Nexus with"
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002314 " active TPG port count: %d\n",
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002315 tpg->tv_tpg_port_count);
2316 return -EBUSY;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002317 }
2318
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002319 if (tpg->tv_tpg_vhost_count != 0) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002320 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002321 pr_err("Unable to remove TCM_vhost I_T Nexus with"
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002322 " active TPG vhost count: %d\n",
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002323 tpg->tv_tpg_vhost_count);
2324 return -EBUSY;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002325 }
2326
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002327 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002328 " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport),
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002329 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
Nicholas Bellinger3aee26b2013-06-21 14:32:04 -07002330
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002331 /*
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002332 * Release the SCSI I_T Nexus to the emulated vhost Target Port
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002333 */
Mike Christie25b88552018-08-02 12:12:27 -05002334 target_remove_session(se_sess);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002335 tpg->tpg_nexus = NULL;
2336 mutex_unlock(&tpg->tv_tpg_mutex);
2337
2338 kfree(tv_nexus);
2339 return 0;
2340}
2341
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002342static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002343{
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002344 struct se_portal_group *se_tpg = to_tpg(item);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002345 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2346 struct vhost_scsi_tpg, se_tpg);
2347 struct vhost_scsi_nexus *tv_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002348 ssize_t ret;
2349
Asias He98718312013-05-06 16:38:28 +08002350 mutex_lock(&tpg->tv_tpg_mutex);
2351 tv_nexus = tpg->tpg_nexus;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002352 if (!tv_nexus) {
Asias He98718312013-05-06 16:38:28 +08002353 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002354 return -ENODEV;
2355 }
Bo Liub3d4f022023-01-29 04:11:45 -05002356 ret = sysfs_emit(page, "%s\n",
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002357 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
Asias He98718312013-05-06 16:38:28 +08002358 mutex_unlock(&tpg->tv_tpg_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002359
2360 return ret;
2361}
2362
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002363static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item,
2364 const char *page, size_t count)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002365{
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002366 struct se_portal_group *se_tpg = to_tpg(item);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002367 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2368 struct vhost_scsi_tpg, se_tpg);
2369 struct vhost_scsi_tport *tport_wwn = tpg->tport;
2370 unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002371 int ret;
2372 /*
2373 * Shutdown the active I_T nexus if 'NULL' is passed..
2374 */
2375 if (!strncmp(page, "NULL", 4)) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002376 ret = vhost_scsi_drop_nexus(tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002377 return (!ret) ? count : ret;
2378 }
2379 /*
2380 * Otherwise make sure the passed virtual Initiator port WWN matches
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002381 * the fabric protocol_id set in vhost_scsi_make_tport(), and call
2382 * vhost_scsi_make_nexus().
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002383 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002384 if (strlen(page) >= VHOST_SCSI_NAMELEN) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002385 pr_err("Emulated NAA Sas Address: %s, exceeds"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002386 " max: %d\n", page, VHOST_SCSI_NAMELEN);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002387 return -EINVAL;
2388 }
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002389 snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002390
2391 ptr = strstr(i_port, "naa.");
2392 if (ptr) {
2393 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
2394 pr_err("Passed SAS Initiator Port %s does not"
2395 " match target port protoid: %s\n", i_port,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002396 vhost_scsi_dump_proto_id(tport_wwn));
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002397 return -EINVAL;
2398 }
2399 port_ptr = &i_port[0];
2400 goto check_newline;
2401 }
2402 ptr = strstr(i_port, "fc.");
2403 if (ptr) {
2404 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
2405 pr_err("Passed FCP Initiator Port %s does not"
2406 " match target port protoid: %s\n", i_port,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002407 vhost_scsi_dump_proto_id(tport_wwn));
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002408 return -EINVAL;
2409 }
2410 port_ptr = &i_port[3]; /* Skip over "fc." */
2411 goto check_newline;
2412 }
2413 ptr = strstr(i_port, "iqn.");
2414 if (ptr) {
2415 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
2416 pr_err("Passed iSCSI Initiator Port %s does not"
2417 " match target port protoid: %s\n", i_port,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002418 vhost_scsi_dump_proto_id(tport_wwn));
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002419 return -EINVAL;
2420 }
2421 port_ptr = &i_port[0];
2422 goto check_newline;
2423 }
2424 pr_err("Unable to locate prefix for emulated Initiator Port:"
2425 " %s\n", i_port);
2426 return -EINVAL;
2427 /*
2428 * Clear any trailing newline for the NAA WWN
2429 */
2430check_newline:
2431 if (i_port[strlen(i_port)-1] == '\n')
2432 i_port[strlen(i_port)-1] = '\0';
2433
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002434 ret = vhost_scsi_make_nexus(tpg, port_ptr);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002435 if (ret < 0)
2436 return ret;
2437
2438 return count;
2439}
2440
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002441CONFIGFS_ATTR(vhost_scsi_tpg_, nexus);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002442
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002443static struct configfs_attribute *vhost_scsi_tpg_attrs[] = {
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002444 &vhost_scsi_tpg_attr_nexus,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002445 NULL,
2446};
2447
Asias He683bd962013-05-06 16:38:27 +08002448static struct se_portal_group *
Bart Van Asscheaa090ea2018-06-22 14:53:02 -07002449vhost_scsi_make_tpg(struct se_wwn *wwn, const char *name)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002450{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002451 struct vhost_scsi_tport *tport = container_of(wwn,
2452 struct vhost_scsi_tport, tport_wwn);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002453
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002454 struct vhost_scsi_tpg *tpg;
Dan Carpenter59c816c2015-02-05 10:37:33 +03002455 u16 tpgt;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002456 int ret;
2457
2458 if (strstr(name, "tpgt_") != name)
2459 return ERR_PTR(-EINVAL);
Dan Carpenter59c816c2015-02-05 10:37:33 +03002460 if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002461 return ERR_PTR(-EINVAL);
2462
Markus Elfring473f0b12017-05-20 13:48:44 +02002463 tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002464 if (!tpg) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002465 pr_err("Unable to allocate struct vhost_scsi_tpg");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002466 return ERR_PTR(-ENOMEM);
2467 }
2468 mutex_init(&tpg->tv_tpg_mutex);
2469 INIT_LIST_HEAD(&tpg->tv_tpg_list);
2470 tpg->tport = tport;
2471 tpg->tport_tpgt = tpgt;
2472
Nicholas Bellingerbc0c94b2015-05-20 21:48:03 -07002473 ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002474 if (ret < 0) {
2475 kfree(tpg);
2476 return NULL;
2477 }
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002478 mutex_lock(&vhost_scsi_mutex);
2479 list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list);
2480 mutex_unlock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002481
2482 return &tpg->se_tpg;
2483}
2484
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002485static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002486{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002487 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2488 struct vhost_scsi_tpg, se_tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002489
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002490 mutex_lock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002491 list_del(&tpg->tv_tpg_list);
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002492 mutex_unlock(&vhost_scsi_mutex);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002493 /*
Nicholas Bellinger101998f2012-07-30 13:30:00 -07002494 * Release the virtual I_T Nexus for this vhost TPG
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002495 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002496 vhost_scsi_drop_nexus(tpg);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002497 /*
2498 * Deregister the se_tpg from TCM..
2499 */
2500 core_tpg_deregister(se_tpg);
2501 kfree(tpg);
2502}
2503
Asias He683bd962013-05-06 16:38:27 +08002504static struct se_wwn *
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002505vhost_scsi_make_tport(struct target_fabric_configfs *tf,
Asias He683bd962013-05-06 16:38:27 +08002506 struct config_group *group,
2507 const char *name)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002508{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002509 struct vhost_scsi_tport *tport;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002510 char *ptr;
2511 u64 wwpn = 0;
2512 int off = 0;
2513
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002514 /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002515 return ERR_PTR(-EINVAL); */
2516
Markus Elfring473f0b12017-05-20 13:48:44 +02002517 tport = kzalloc(sizeof(*tport), GFP_KERNEL);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002518 if (!tport) {
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002519 pr_err("Unable to allocate struct vhost_scsi_tport");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002520 return ERR_PTR(-ENOMEM);
2521 }
2522 tport->tport_wwpn = wwpn;
2523 /*
2524 * Determine the emulated Protocol Identifier and Target Port Name
2525 * based on the incoming configfs directory name.
2526 */
2527 ptr = strstr(name, "naa.");
2528 if (ptr) {
2529 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
2530 goto check_len;
2531 }
2532 ptr = strstr(name, "fc.");
2533 if (ptr) {
2534 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
2535 off = 3; /* Skip over "fc." */
2536 goto check_len;
2537 }
2538 ptr = strstr(name, "iqn.");
2539 if (ptr) {
2540 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
2541 goto check_len;
2542 }
2543
2544 pr_err("Unable to locate prefix for emulated Target Port:"
2545 " %s\n", name);
2546 kfree(tport);
2547 return ERR_PTR(-EINVAL);
2548
2549check_len:
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002550 if (strlen(name) >= VHOST_SCSI_NAMELEN) {
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002551 pr_err("Emulated %s Address: %s, exceeds"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002552 " max: %d\n", name, vhost_scsi_dump_proto_id(tport),
2553 VHOST_SCSI_NAMELEN);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002554 kfree(tport);
2555 return ERR_PTR(-EINVAL);
2556 }
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002557 snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002558
2559 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002560 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002561
2562 return &tport->tport_wwn;
2563}
2564
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002565static void vhost_scsi_drop_tport(struct se_wwn *wwn)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002566{
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002567 struct vhost_scsi_tport *tport = container_of(wwn,
2568 struct vhost_scsi_tport, tport_wwn);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002569
2570 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002571 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport),
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002572 tport->tport_name);
2573
2574 kfree(tport);
2575}
2576
Asias He683bd962013-05-06 16:38:27 +08002577static ssize_t
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002578vhost_scsi_wwn_version_show(struct config_item *item, char *page)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002579{
Bo Liub3d4f022023-01-29 04:11:45 -05002580 return sysfs_emit(page, "TCM_VHOST fabric module %s on %s/%s"
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002581 "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002582 utsname()->machine);
2583}
2584
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002585CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002586
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002587static struct configfs_attribute *vhost_scsi_wwn_attrs[] = {
Christoph Hellwig2eafd722015-10-03 15:32:55 +02002588 &vhost_scsi_wwn_attr_version,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002589 NULL,
2590};
2591
Bhumika Goyal1d822a42017-01-09 20:51:02 +05302592static const struct target_core_fabric_ops vhost_scsi_ops = {
Christoph Hellwig9ac89282015-04-08 20:01:35 +02002593 .module = THIS_MODULE,
David Disseldorp30c7ca92018-11-23 18:36:12 +01002594 .fabric_name = "vhost",
Sudhakar Panneerselvam5ae6a6a2020-05-22 16:51:57 +00002595 .max_data_sg_nents = VHOST_SCSI_PREALLOC_SGLS,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002596 .tpg_get_wwn = vhost_scsi_get_fabric_wwn,
2597 .tpg_get_tag = vhost_scsi_get_tpgt,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002598 .tpg_check_demo_mode = vhost_scsi_check_true,
2599 .tpg_check_demo_mode_cache = vhost_scsi_check_true,
Nicholas Bellingerb1d75fe2015-03-28 00:03:51 -07002600 .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002601 .release_cmd = vhost_scsi_release_cmd,
Nicholas Bellinger084ed452013-06-06 02:20:41 -07002602 .check_stop_free = vhost_scsi_check_stop_free,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002603 .sess_get_initiator_sid = NULL,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002604 .write_pending = vhost_scsi_write_pending,
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002605 .queue_data_in = vhost_scsi_queue_data_in,
2606 .queue_status = vhost_scsi_queue_status,
2607 .queue_tm_rsp = vhost_scsi_queue_tm_rsp,
2608 .aborted_task = vhost_scsi_aborted_task,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002609 /*
2610 * Setup callers for generic logic in target_core_fabric_configfs.c
2611 */
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002612 .fabric_make_wwn = vhost_scsi_make_tport,
2613 .fabric_drop_wwn = vhost_scsi_drop_tport,
2614 .fabric_make_tpg = vhost_scsi_make_tpg,
2615 .fabric_drop_tpg = vhost_scsi_drop_tpg,
2616 .fabric_post_link = vhost_scsi_port_link,
2617 .fabric_pre_unlink = vhost_scsi_port_unlink,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002618
Christoph Hellwig9ac89282015-04-08 20:01:35 +02002619 .tfc_wwn_attrs = vhost_scsi_wwn_attrs,
2620 .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs,
2621 .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs,
Mike Christie194605d2023-09-27 21:09:01 -05002622
2623 .default_submit_type = TARGET_QUEUE_SUBMIT,
2624 .direct_submit_supp = 1,
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002625};
2626
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002627static int __init vhost_scsi_init(void)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002628{
2629 int ret = -ENOMEM;
Christoph Hellwig9ac89282015-04-08 20:01:35 +02002630
2631 pr_debug("TCM_VHOST fabric module %s on %s/%s"
2632 " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2633 utsname()->machine);
2634
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002635 ret = vhost_scsi_register();
2636 if (ret < 0)
Mike Christie6ec29cb2021-02-27 10:59:58 -06002637 goto out;
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002638
Christoph Hellwig9ac89282015-04-08 20:01:35 +02002639 ret = target_register_template(&vhost_scsi_ops);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002640 if (ret < 0)
2641 goto out_vhost_scsi_deregister;
2642
2643 return 0;
2644
2645out_vhost_scsi_deregister:
2646 vhost_scsi_deregister();
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002647out:
2648 return ret;
2649};
2650
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002651static void vhost_scsi_exit(void)
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002652{
Christoph Hellwig9ac89282015-04-08 20:01:35 +02002653 target_unregister_template(&vhost_scsi_ops);
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002654 vhost_scsi_deregister();
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002655};
2656
Michael S. Tsirkin181c04a2013-05-02 03:52:59 +03002657MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2658MODULE_ALIAS("tcm_vhost");
Nicholas Bellinger057cbf42012-07-18 14:31:32 -07002659MODULE_LICENSE("GPL");
Nicholas Bellinger1a1ff822015-01-31 23:56:53 -08002660module_init(vhost_scsi_init);
2661module_exit(vhost_scsi_exit);