Commit | Line | Data |
---|---|---|
057cbf49 NB |
1 | /******************************************************************************* |
2 | * Vhost kernel TCM fabric driver for virtio SCSI initiators | |
3 | * | |
4c76251e | 4 | * (C) Copyright 2010-2013 Datera, Inc. |
057cbf49 NB |
5 | * (C) Copyright 2010-2012 IBM Corp. |
6 | * | |
7 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. | |
8 | * | |
4c76251e | 9 | * Authors: Nicholas A. Bellinger <nab@daterainc.com> |
057cbf49 NB |
10 | * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | ****************************************************************************/ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/moduleparam.h> | |
26 | #include <generated/utsrelease.h> | |
27 | #include <linux/utsname.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/kthread.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/configfs.h> | |
34 | #include <linux/ctype.h> | |
35 | #include <linux/compat.h> | |
36 | #include <linux/eventfd.h> | |
057cbf49 | 37 | #include <linux/fs.h> |
5538d294 | 38 | #include <linux/vmalloc.h> |
057cbf49 NB |
39 | #include <linux/miscdevice.h> |
40 | #include <asm/unaligned.h> | |
ba929992 BVA |
41 | #include <scsi/scsi_common.h> |
42 | #include <scsi/scsi_proto.h> | |
057cbf49 NB |
43 | #include <target/target_core_base.h> |
44 | #include <target/target_core_fabric.h> | |
057cbf49 | 45 | #include <linux/vhost.h> |
057cbf49 | 46 | #include <linux/virtio_scsi.h> |
9d6064a3 | 47 | #include <linux/llist.h> |
1b7f390e | 48 | #include <linux/bitmap.h> |
4824d3bf | 49 | #include <linux/percpu_ida.h> |
057cbf49 | 50 | |
057cbf49 | 51 | #include "vhost.h" |
5012a3a3 | 52 | |
1a1ff825 NB |
53 | #define VHOST_SCSI_VERSION "v0.1" |
54 | #define VHOST_SCSI_NAMELEN 256 | |
55 | #define VHOST_SCSI_MAX_CDB_SIZE 32 | |
56 | #define VHOST_SCSI_DEFAULT_TAGS 256 | |
57 | #define VHOST_SCSI_PREALLOC_SGLS 2048 | |
58 | #define VHOST_SCSI_PREALLOC_UPAGES 2048 | |
59 | #define VHOST_SCSI_PREALLOC_PROT_SGLS 512 | |
5012a3a3 MT |
60 | |
61 | struct vhost_scsi_inflight { | |
62 | /* Wait for the flush operation to finish */ | |
63 | struct completion comp; | |
64 | /* Refcount for the inflight reqs */ | |
65 | struct kref kref; | |
66 | }; | |
67 | ||
1a1ff825 | 68 | struct vhost_scsi_cmd { |
5012a3a3 MT |
69 | /* Descriptor from vhost_get_vq_desc() for virt_queue segment */ |
70 | int tvc_vq_desc; | |
71 | /* virtio-scsi initiator task attribute */ | |
72 | int tvc_task_attr; | |
79c14141 NB |
73 | /* virtio-scsi response incoming iovecs */ |
74 | int tvc_in_iovs; | |
5012a3a3 MT |
75 | /* virtio-scsi initiator data direction */ |
76 | enum dma_data_direction tvc_data_direction; | |
77 | /* Expected data transfer length from virtio-scsi header */ | |
78 | u32 tvc_exp_data_len; | |
79 | /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */ | |
80 | u64 tvc_tag; | |
81 | /* The number of scatterlists associated with this cmd */ | |
82 | u32 tvc_sgl_count; | |
e31885dd | 83 | u32 tvc_prot_sgl_count; |
1a1ff825 | 84 | /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */ |
5012a3a3 MT |
85 | u32 tvc_lun; |
86 | /* Pointer to the SGL formatted memory from virtio-scsi */ | |
87 | struct scatterlist *tvc_sgl; | |
b1935f68 | 88 | struct scatterlist *tvc_prot_sgl; |
3aee26b4 | 89 | struct page **tvc_upages; |
79c14141 | 90 | /* Pointer to response header iovec */ |
a77ec83a | 91 | struct iovec tvc_resp_iov; |
5012a3a3 MT |
92 | /* Pointer to vhost_scsi for our device */ |
93 | struct vhost_scsi *tvc_vhost; | |
94 | /* Pointer to vhost_virtqueue for the cmd */ | |
95 | struct vhost_virtqueue *tvc_vq; | |
96 | /* Pointer to vhost nexus memory */ | |
1a1ff825 | 97 | struct vhost_scsi_nexus *tvc_nexus; |
5012a3a3 MT |
98 | /* The TCM I/O descriptor that is accessed via container_of() */ |
99 | struct se_cmd tvc_se_cmd; | |
1a1ff825 | 100 | /* work item used for cmwq dispatch to vhost_scsi_submission_work() */ |
5012a3a3 MT |
101 | struct work_struct work; |
102 | /* Copy of the incoming SCSI command descriptor block (CDB) */ | |
1a1ff825 | 103 | unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE]; |
5012a3a3 MT |
104 | /* Sense buffer that will be mapped into outgoing status */ |
105 | unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER]; | |
106 | /* Completed commands list, serviced from vhost worker thread */ | |
107 | struct llist_node tvc_completion_list; | |
108 | /* Used to track inflight cmd */ | |
109 | struct vhost_scsi_inflight *inflight; | |
110 | }; | |
111 | ||
1a1ff825 | 112 | struct vhost_scsi_nexus { |
5012a3a3 MT |
113 | /* Pointer to TCM session for I_T Nexus */ |
114 | struct se_session *tvn_se_sess; | |
115 | }; | |
116 | ||
1a1ff825 | 117 | struct vhost_scsi_tpg { |
5012a3a3 MT |
118 | /* Vhost port target portal group tag for TCM */ |
119 | u16 tport_tpgt; | |
120 | /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */ | |
121 | int tv_tpg_port_count; | |
122 | /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */ | |
123 | int tv_tpg_vhost_count; | |
b1d75fe5 NB |
124 | /* Used for enabling T10-PI with legacy devices */ |
125 | int tv_fabric_prot_type; | |
1a1ff825 | 126 | /* list for vhost_scsi_list */ |
5012a3a3 MT |
127 | struct list_head tv_tpg_list; |
128 | /* Used to protect access for tpg_nexus */ | |
129 | struct mutex tv_tpg_mutex; | |
130 | /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */ | |
1a1ff825 NB |
131 | struct vhost_scsi_nexus *tpg_nexus; |
132 | /* Pointer back to vhost_scsi_tport */ | |
133 | struct vhost_scsi_tport *tport; | |
134 | /* Returned by vhost_scsi_make_tpg() */ | |
5012a3a3 MT |
135 | struct se_portal_group se_tpg; |
136 | /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */ | |
137 | struct vhost_scsi *vhost_scsi; | |
138 | }; | |
139 | ||
1a1ff825 | 140 | struct vhost_scsi_tport { |
5012a3a3 MT |
141 | /* SCSI protocol the tport is providing */ |
142 | u8 tport_proto_id; | |
143 | /* Binary World Wide unique Port Name for Vhost Target port */ | |
144 | u64 tport_wwpn; | |
145 | /* ASCII formatted WWPN for Vhost Target port */ | |
1a1ff825 NB |
146 | char tport_name[VHOST_SCSI_NAMELEN]; |
147 | /* Returned by vhost_scsi_make_tport() */ | |
5012a3a3 MT |
148 | struct se_wwn tport_wwn; |
149 | }; | |
150 | ||
1a1ff825 | 151 | struct vhost_scsi_evt { |
5012a3a3 MT |
152 | /* event to be sent to guest */ |
153 | struct virtio_scsi_event event; | |
154 | /* event list, serviced from vhost worker thread */ | |
155 | struct llist_node list; | |
156 | }; | |
057cbf49 | 157 | |
101998f6 NB |
158 | enum { |
159 | VHOST_SCSI_VQ_CTL = 0, | |
160 | VHOST_SCSI_VQ_EVT = 1, | |
161 | VHOST_SCSI_VQ_IO = 2, | |
162 | }; | |
163 | ||
e72fd72e | 164 | /* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */ |
5dade710 | 165 | enum { |
95e7c434 | 166 | VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) | |
4e9fa50c | 167 | (1ULL << VIRTIO_SCSI_F_T10_PI) |
5dade710 NB |
168 | }; |
169 | ||
1b7f390e AH |
170 | #define VHOST_SCSI_MAX_TARGET 256 |
171 | #define VHOST_SCSI_MAX_VQ 128 | |
a6c9af87 | 172 | #define VHOST_SCSI_MAX_EVENT 128 |
67e18cf9 | 173 | |
3ab2e420 AH |
174 | struct vhost_scsi_virtqueue { |
175 | struct vhost_virtqueue vq; | |
3dfbff32 MT |
176 | /* |
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 | */ | |
f2f0173d | 181 | struct vhost_scsi_inflight inflights[2]; |
3dfbff32 MT |
182 | /* |
183 | * Indicate current inflight in use, protected by vq->mutex. | |
184 | * Writers must also take dev mutex and flush under it. | |
185 | */ | |
f2f0173d | 186 | int inflight_idx; |
3ab2e420 AH |
187 | }; |
188 | ||
057cbf49 | 189 | struct vhost_scsi { |
67e18cf9 | 190 | /* Protected by vhost_scsi->dev.mutex */ |
1a1ff825 | 191 | struct vhost_scsi_tpg **vs_tpg; |
67e18cf9 | 192 | char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
67e18cf9 | 193 | |
057cbf49 | 194 | struct vhost_dev dev; |
3ab2e420 | 195 | struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ]; |
057cbf49 NB |
196 | |
197 | struct vhost_work vs_completion_work; /* cmd completion work item */ | |
9d6064a3 | 198 | struct llist_head vs_completion_list; /* cmd completion queue */ |
a6c9af87 AH |
199 | |
200 | struct vhost_work vs_event_work; /* evt injection work item */ | |
201 | struct llist_head vs_event_list; /* evt injection queue */ | |
202 | ||
203 | bool vs_events_missed; /* any missed events, protected by vq->mutex */ | |
204 | int vs_events_nr; /* num of pending events, protected by vq->mutex */ | |
057cbf49 NB |
205 | }; |
206 | ||
1a1ff825 | 207 | static struct workqueue_struct *vhost_scsi_workqueue; |
057cbf49 | 208 | |
1a1ff825 NB |
209 | /* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */ |
210 | static DEFINE_MUTEX(vhost_scsi_mutex); | |
211 | static LIST_HEAD(vhost_scsi_list); | |
057cbf49 | 212 | |
b4078b5f | 213 | static int iov_num_pages(void __user *iov_base, size_t iov_len) |
765b34fd | 214 | { |
b4078b5f NB |
215 | return (PAGE_ALIGN((unsigned long)iov_base + iov_len) - |
216 | ((unsigned long)iov_base & PAGE_MASK)) >> PAGE_SHIFT; | |
765b34fd AH |
217 | } |
218 | ||
1a1ff825 | 219 | static void vhost_scsi_done_inflight(struct kref *kref) |
f2f0173d AH |
220 | { |
221 | struct vhost_scsi_inflight *inflight; | |
222 | ||
223 | inflight = container_of(kref, struct vhost_scsi_inflight, kref); | |
224 | complete(&inflight->comp); | |
225 | } | |
226 | ||
1a1ff825 | 227 | static void vhost_scsi_init_inflight(struct vhost_scsi *vs, |
f2f0173d AH |
228 | struct vhost_scsi_inflight *old_inflight[]) |
229 | { | |
230 | struct vhost_scsi_inflight *new_inflight; | |
231 | struct vhost_virtqueue *vq; | |
232 | int idx, i; | |
233 | ||
234 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
235 | vq = &vs->vqs[i].vq; | |
236 | ||
237 | mutex_lock(&vq->mutex); | |
238 | ||
239 | /* store old infight */ | |
240 | idx = vs->vqs[i].inflight_idx; | |
241 | if (old_inflight) | |
242 | old_inflight[i] = &vs->vqs[i].inflights[idx]; | |
243 | ||
244 | /* setup new infight */ | |
245 | vs->vqs[i].inflight_idx = idx ^ 1; | |
246 | new_inflight = &vs->vqs[i].inflights[idx ^ 1]; | |
247 | kref_init(&new_inflight->kref); | |
248 | init_completion(&new_inflight->comp); | |
249 | ||
250 | mutex_unlock(&vq->mutex); | |
251 | } | |
252 | } | |
253 | ||
254 | static struct vhost_scsi_inflight * | |
1a1ff825 | 255 | vhost_scsi_get_inflight(struct vhost_virtqueue *vq) |
f2f0173d AH |
256 | { |
257 | struct vhost_scsi_inflight *inflight; | |
258 | struct vhost_scsi_virtqueue *svq; | |
259 | ||
260 | svq = container_of(vq, struct vhost_scsi_virtqueue, vq); | |
261 | inflight = &svq->inflights[svq->inflight_idx]; | |
262 | kref_get(&inflight->kref); | |
263 | ||
264 | return inflight; | |
265 | } | |
266 | ||
1a1ff825 | 267 | static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight) |
f2f0173d | 268 | { |
1a1ff825 | 269 | kref_put(&inflight->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
270 | } |
271 | ||
1a1ff825 | 272 | static int vhost_scsi_check_true(struct se_portal_group *se_tpg) |
057cbf49 NB |
273 | { |
274 | return 1; | |
275 | } | |
276 | ||
1a1ff825 | 277 | static int vhost_scsi_check_false(struct se_portal_group *se_tpg) |
057cbf49 NB |
278 | { |
279 | return 0; | |
280 | } | |
281 | ||
1a1ff825 | 282 | static char *vhost_scsi_get_fabric_name(void) |
057cbf49 NB |
283 | { |
284 | return "vhost"; | |
285 | } | |
286 | ||
1a1ff825 | 287 | static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg) |
057cbf49 | 288 | { |
1a1ff825 NB |
289 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
290 | struct vhost_scsi_tpg, se_tpg); | |
291 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
292 | |
293 | return &tport->tport_name[0]; | |
294 | } | |
295 | ||
1a1ff825 | 296 | static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg) |
057cbf49 | 297 | { |
1a1ff825 NB |
298 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
299 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 NB |
300 | return tpg->tport_tpgt; |
301 | } | |
302 | ||
b1d75fe5 NB |
303 | static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg) |
304 | { | |
305 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, | |
306 | struct vhost_scsi_tpg, se_tpg); | |
307 | ||
308 | return tpg->tv_fabric_prot_type; | |
309 | } | |
310 | ||
1a1ff825 | 311 | static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg) |
057cbf49 NB |
312 | { |
313 | return 1; | |
314 | } | |
315 | ||
1a1ff825 | 316 | static void vhost_scsi_release_cmd(struct se_cmd *se_cmd) |
057cbf49 | 317 | { |
1a1ff825 NB |
318 | struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd, |
319 | struct vhost_scsi_cmd, tvc_se_cmd); | |
de1419e4 | 320 | struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess; |
e31885dd | 321 | int i; |
084ed45b NB |
322 | |
323 | if (tv_cmd->tvc_sgl_count) { | |
084ed45b NB |
324 | for (i = 0; i < tv_cmd->tvc_sgl_count; i++) |
325 | put_page(sg_page(&tv_cmd->tvc_sgl[i])); | |
d3d665a6 | 326 | } |
e31885dd NB |
327 | if (tv_cmd->tvc_prot_sgl_count) { |
328 | for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++) | |
329 | put_page(sg_page(&tv_cmd->tvc_prot_sgl[i])); | |
330 | } | |
084ed45b | 331 | |
1a1ff825 | 332 | vhost_scsi_put_inflight(tv_cmd->inflight); |
4824d3bf | 333 | percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag); |
057cbf49 NB |
334 | } |
335 | ||
1a1ff825 | 336 | static u32 vhost_scsi_sess_get_index(struct se_session *se_sess) |
057cbf49 NB |
337 | { |
338 | return 0; | |
339 | } | |
340 | ||
1a1ff825 | 341 | static int vhost_scsi_write_pending(struct se_cmd *se_cmd) |
057cbf49 NB |
342 | { |
343 | /* Go ahead and process the write immediately */ | |
344 | target_execute_cmd(se_cmd); | |
345 | return 0; | |
346 | } | |
347 | ||
1a1ff825 | 348 | static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd) |
057cbf49 NB |
349 | { |
350 | return 0; | |
351 | } | |
352 | ||
1a1ff825 | 353 | static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl) |
057cbf49 NB |
354 | { |
355 | return; | |
356 | } | |
357 | ||
1a1ff825 | 358 | static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd) |
057cbf49 NB |
359 | { |
360 | return 0; | |
361 | } | |
362 | ||
1a1ff825 | 363 | static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd) |
101998f6 | 364 | { |
3c63f66a | 365 | struct vhost_scsi *vs = cmd->tvc_vhost; |
101998f6 | 366 | |
3c63f66a | 367 | llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
101998f6 NB |
368 | |
369 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
370 | } | |
057cbf49 | 371 | |
1a1ff825 | 372 | static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd) |
057cbf49 | 373 | { |
1a1ff825 NB |
374 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
375 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 376 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
377 | return 0; |
378 | } | |
379 | ||
1a1ff825 | 380 | static int vhost_scsi_queue_status(struct se_cmd *se_cmd) |
057cbf49 | 381 | { |
1a1ff825 NB |
382 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
383 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 384 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
385 | return 0; |
386 | } | |
387 | ||
1a1ff825 | 388 | static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd) |
057cbf49 | 389 | { |
b79fafac | 390 | return; |
057cbf49 NB |
391 | } |
392 | ||
1a1ff825 | 393 | static void vhost_scsi_aborted_task(struct se_cmd *se_cmd) |
131e6abc NB |
394 | { |
395 | return; | |
396 | } | |
397 | ||
1a1ff825 | 398 | static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 AH |
399 | { |
400 | vs->vs_events_nr--; | |
401 | kfree(evt); | |
402 | } | |
403 | ||
1a1ff825 NB |
404 | static struct vhost_scsi_evt * |
405 | vhost_scsi_allocate_evt(struct vhost_scsi *vs, | |
683bd967 | 406 | u32 event, u32 reason) |
a6c9af87 | 407 | { |
3ab2e420 | 408 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
1a1ff825 | 409 | struct vhost_scsi_evt *evt; |
a6c9af87 AH |
410 | |
411 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
412 | vs->vs_events_missed = true; | |
413 | return NULL; | |
414 | } | |
415 | ||
416 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
417 | if (!evt) { | |
1a1ff825 | 418 | vq_err(vq, "Failed to allocate vhost_scsi_evt\n"); |
a6c9af87 AH |
419 | vs->vs_events_missed = true; |
420 | return NULL; | |
421 | } | |
422 | ||
e72fd72e MT |
423 | evt->event.event = cpu_to_vhost32(vq, event); |
424 | evt->event.reason = cpu_to_vhost32(vq, reason); | |
a6c9af87 AH |
425 | vs->vs_events_nr++; |
426 | ||
427 | return evt; | |
428 | } | |
429 | ||
1a1ff825 | 430 | static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd) |
057cbf49 | 431 | { |
3c63f66a | 432 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
433 | |
434 | /* TODO locking against target/backend threads? */ | |
6c131d0c | 435 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 436 | |
084ed45b | 437 | } |
f2f0173d | 438 | |
084ed45b NB |
439 | static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) |
440 | { | |
afc16604 | 441 | return target_put_sess_cmd(se_cmd); |
057cbf49 NB |
442 | } |
443 | ||
683bd967 | 444 | static void |
1a1ff825 | 445 | vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 | 446 | { |
3ab2e420 | 447 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
448 | struct virtio_scsi_event *event = &evt->event; |
449 | struct virtio_scsi_event __user *eventp; | |
450 | unsigned out, in; | |
451 | int head, ret; | |
452 | ||
453 | if (!vq->private_data) { | |
454 | vs->vs_events_missed = true; | |
455 | return; | |
456 | } | |
457 | ||
458 | again: | |
459 | vhost_disable_notify(&vs->dev, vq); | |
47283bef | 460 | head = vhost_get_vq_desc(vq, vq->iov, |
a6c9af87 AH |
461 | ARRAY_SIZE(vq->iov), &out, &in, |
462 | NULL, NULL); | |
463 | if (head < 0) { | |
464 | vs->vs_events_missed = true; | |
465 | return; | |
466 | } | |
467 | if (head == vq->num) { | |
468 | if (vhost_enable_notify(&vs->dev, vq)) | |
469 | goto again; | |
470 | vs->vs_events_missed = true; | |
471 | return; | |
472 | } | |
473 | ||
474 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { | |
475 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", | |
476 | vq->iov[out].iov_len); | |
477 | vs->vs_events_missed = true; | |
478 | return; | |
479 | } | |
480 | ||
481 | if (vs->vs_events_missed) { | |
e72fd72e | 482 | event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED); |
a6c9af87 AH |
483 | vs->vs_events_missed = false; |
484 | } | |
485 | ||
486 | eventp = vq->iov[out].iov_base; | |
487 | ret = __copy_to_user(eventp, event, sizeof(*event)); | |
488 | if (!ret) | |
489 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
490 | else | |
1a1ff825 | 491 | vq_err(vq, "Faulted on vhost_scsi_send_event\n"); |
a6c9af87 AH |
492 | } |
493 | ||
1a1ff825 | 494 | static void vhost_scsi_evt_work(struct vhost_work *work) |
a6c9af87 AH |
495 | { |
496 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
497 | vs_event_work); | |
3ab2e420 | 498 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
12bdcbd5 | 499 | struct vhost_scsi_evt *evt, *t; |
a6c9af87 AH |
500 | struct llist_node *llnode; |
501 | ||
502 | mutex_lock(&vq->mutex); | |
503 | llnode = llist_del_all(&vs->vs_event_list); | |
12bdcbd5 | 504 | llist_for_each_entry_safe(evt, t, llnode, list) { |
1a1ff825 NB |
505 | vhost_scsi_do_evt_work(vs, evt); |
506 | vhost_scsi_free_evt(vs, evt); | |
a6c9af87 AH |
507 | } |
508 | mutex_unlock(&vq->mutex); | |
509 | } | |
510 | ||
057cbf49 NB |
511 | /* Fill in status and signal that we are done processing this command |
512 | * | |
513 | * This is scheduled in the vhost work queue so we are called with the owner | |
514 | * process mm and can access the vring. | |
515 | */ | |
516 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) | |
517 | { | |
518 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
519 | vs_completion_work); | |
1b7f390e | 520 | DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 521 | struct virtio_scsi_cmd_resp v_rsp; |
1a1ff825 | 522 | struct vhost_scsi_cmd *cmd; |
9d6064a3 AH |
523 | struct llist_node *llnode; |
524 | struct se_cmd *se_cmd; | |
79c14141 | 525 | struct iov_iter iov_iter; |
1b7f390e | 526 | int ret, vq; |
057cbf49 | 527 | |
1b7f390e | 528 | bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 529 | llnode = llist_del_all(&vs->vs_completion_list); |
12bdcbd5 | 530 | llist_for_each_entry(cmd, llnode, tvc_completion_list) { |
3c63f66a | 531 | se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
532 | |
533 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
3c63f66a | 534 | cmd, se_cmd->residual_count, se_cmd->scsi_status); |
057cbf49 NB |
535 | |
536 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
e72fd72e | 537 | v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count); |
057cbf49 NB |
538 | /* TODO is status_qualifier field needed? */ |
539 | v_rsp.status = se_cmd->scsi_status; | |
e72fd72e MT |
540 | v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq, |
541 | se_cmd->scsi_sense_length); | |
3c63f66a | 542 | memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
e72fd72e | 543 | se_cmd->scsi_sense_length); |
79c14141 | 544 | |
a77ec83a | 545 | iov_iter_init(&iov_iter, READ, &cmd->tvc_resp_iov, |
79c14141 NB |
546 | cmd->tvc_in_iovs, sizeof(v_rsp)); |
547 | ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter); | |
548 | if (likely(ret == sizeof(v_rsp))) { | |
3ab2e420 | 549 | struct vhost_scsi_virtqueue *q; |
3c63f66a AH |
550 | vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
551 | q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); | |
3ab2e420 | 552 | vq = q - vs->vqs; |
1b7f390e AH |
553 | __set_bit(vq, signal); |
554 | } else | |
057cbf49 NB |
555 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
556 | ||
3c63f66a | 557 | vhost_scsi_free_cmd(cmd); |
057cbf49 NB |
558 | } |
559 | ||
1b7f390e AH |
560 | vq = -1; |
561 | while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) | |
562 | < VHOST_SCSI_MAX_VQ) | |
3ab2e420 | 563 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
564 | } |
565 | ||
1a1ff825 NB |
566 | static struct vhost_scsi_cmd * |
567 | vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg, | |
95e7c434 NB |
568 | unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr, |
569 | u32 exp_data_len, int data_direction) | |
057cbf49 | 570 | { |
1a1ff825 NB |
571 | struct vhost_scsi_cmd *cmd; |
572 | struct vhost_scsi_nexus *tv_nexus; | |
4824d3bf | 573 | struct se_session *se_sess; |
b1935f68 | 574 | struct scatterlist *sg, *prot_sg; |
3aee26b4 | 575 | struct page **pages; |
4824d3bf | 576 | int tag; |
057cbf49 | 577 | |
98718312 | 578 | tv_nexus = tpg->tpg_nexus; |
057cbf49 | 579 | if (!tv_nexus) { |
1a1ff825 | 580 | pr_err("Unable to locate active struct vhost_scsi_nexus\n"); |
057cbf49 NB |
581 | return ERR_PTR(-EIO); |
582 | } | |
4824d3bf | 583 | se_sess = tv_nexus->tvn_se_sess; |
057cbf49 | 584 | |
6f6b5d1e | 585 | tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING); |
4a47d3a1 | 586 | if (tag < 0) { |
1a1ff825 | 587 | pr_err("Unable to obtain tag for vhost_scsi_cmd\n"); |
4a47d3a1 NB |
588 | return ERR_PTR(-ENOMEM); |
589 | } | |
590 | ||
1a1ff825 | 591 | cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag]; |
3aee26b4 | 592 | sg = cmd->tvc_sgl; |
b1935f68 | 593 | prot_sg = cmd->tvc_prot_sgl; |
3aee26b4 | 594 | pages = cmd->tvc_upages; |
1a1ff825 | 595 | memset(cmd, 0, sizeof(struct vhost_scsi_cmd)); |
4824d3bf | 596 | |
3aee26b4 | 597 | cmd->tvc_sgl = sg; |
b1935f68 | 598 | cmd->tvc_prot_sgl = prot_sg; |
3aee26b4 | 599 | cmd->tvc_upages = pages; |
4824d3bf | 600 | cmd->tvc_se_cmd.map_tag = tag; |
95e7c434 NB |
601 | cmd->tvc_tag = scsi_tag; |
602 | cmd->tvc_lun = lun; | |
603 | cmd->tvc_task_attr = task_attr; | |
3c63f66a AH |
604 | cmd->tvc_exp_data_len = exp_data_len; |
605 | cmd->tvc_data_direction = data_direction; | |
606 | cmd->tvc_nexus = tv_nexus; | |
1a1ff825 | 607 | cmd->inflight = vhost_scsi_get_inflight(vq); |
3c63f66a | 608 | |
1a1ff825 | 609 | memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE); |
95e7c434 | 610 | |
3c63f66a | 611 | return cmd; |
057cbf49 NB |
612 | } |
613 | ||
614 | /* | |
615 | * Map a user memory range into a scatterlist | |
616 | * | |
617 | * Returns the number of scatterlist entries used or -errno on error. | |
618 | */ | |
683bd967 | 619 | static int |
1a1ff825 | 620 | vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd, |
b4078b5f NB |
621 | void __user *ptr, |
622 | size_t len, | |
3aee26b4 | 623 | struct scatterlist *sgl, |
5a01d082 | 624 | bool write) |
057cbf49 | 625 | { |
b4078b5f NB |
626 | unsigned int npages = 0, offset, nbytes; |
627 | unsigned int pages_nr = iov_num_pages(ptr, len); | |
057cbf49 | 628 | struct scatterlist *sg = sgl; |
b4078b5f | 629 | struct page **pages = cmd->tvc_upages; |
1810053e | 630 | int ret, i; |
057cbf49 | 631 | |
1a1ff825 | 632 | if (pages_nr > VHOST_SCSI_PREALLOC_UPAGES) { |
3aee26b4 | 633 | pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than" |
1a1ff825 NB |
634 | " preallocated VHOST_SCSI_PREALLOC_UPAGES: %u\n", |
635 | pages_nr, VHOST_SCSI_PREALLOC_UPAGES); | |
3aee26b4 NB |
636 | return -ENOBUFS; |
637 | } | |
638 | ||
1810053e AH |
639 | ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages); |
640 | /* No pages were pinned */ | |
641 | if (ret < 0) | |
642 | goto out; | |
643 | /* Less pages pinned than wanted */ | |
644 | if (ret != pages_nr) { | |
645 | for (i = 0; i < ret; i++) | |
646 | put_page(pages[i]); | |
647 | ret = -EFAULT; | |
648 | goto out; | |
649 | } | |
650 | ||
651 | while (len > 0) { | |
652 | offset = (uintptr_t)ptr & ~PAGE_MASK; | |
653 | nbytes = min_t(unsigned int, PAGE_SIZE - offset, len); | |
654 | sg_set_page(sg, pages[npages], nbytes, offset); | |
057cbf49 NB |
655 | ptr += nbytes; |
656 | len -= nbytes; | |
657 | sg++; | |
658 | npages++; | |
659 | } | |
057cbf49 | 660 | |
1810053e | 661 | out: |
057cbf49 NB |
662 | return ret; |
663 | } | |
664 | ||
683bd967 | 665 | static int |
e8de56b5 | 666 | vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls) |
057cbf49 | 667 | { |
e8de56b5 | 668 | int sgl_count = 0; |
057cbf49 | 669 | |
e8de56b5 NB |
670 | if (!iter || !iter->iov) { |
671 | pr_err("%s: iter->iov is NULL, but expected bytes: %zu" | |
672 | " present\n", __func__, bytes); | |
673 | return -EINVAL; | |
674 | } | |
f3158f36 | 675 | |
e8de56b5 NB |
676 | sgl_count = iov_iter_npages(iter, 0xffff); |
677 | if (sgl_count > max_sgls) { | |
678 | pr_err("%s: requested sgl_count: %d exceeds pre-allocated" | |
679 | " max_sgls: %d\n", __func__, sgl_count, max_sgls); | |
680 | return -EINVAL; | |
5a01d082 | 681 | } |
e8de56b5 NB |
682 | return sgl_count; |
683 | } | |
057cbf49 | 684 | |
e8de56b5 | 685 | static int |
1a1ff825 NB |
686 | vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write, |
687 | struct iov_iter *iter, | |
688 | struct scatterlist *sg, int sg_count) | |
e8de56b5 NB |
689 | { |
690 | size_t off = iter->iov_offset; | |
691 | int i, ret; | |
057cbf49 | 692 | |
e8de56b5 NB |
693 | for (i = 0; i < iter->nr_segs; i++) { |
694 | void __user *base = iter->iov[i].iov_base + off; | |
695 | size_t len = iter->iov[i].iov_len - off; | |
5a01d082 | 696 | |
e8de56b5 | 697 | ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write); |
057cbf49 | 698 | if (ret < 0) { |
e8de56b5 NB |
699 | for (i = 0; i < sg_count; i++) { |
700 | struct page *page = sg_page(&sg[i]); | |
701 | if (page) | |
702 | put_page(page); | |
703 | } | |
057cbf49 NB |
704 | return ret; |
705 | } | |
057cbf49 | 706 | sg += ret; |
e8de56b5 | 707 | off = 0; |
057cbf49 NB |
708 | } |
709 | return 0; | |
710 | } | |
711 | ||
e31885dd | 712 | static int |
1a1ff825 | 713 | vhost_scsi_mapal(struct vhost_scsi_cmd *cmd, |
e8de56b5 NB |
714 | size_t prot_bytes, struct iov_iter *prot_iter, |
715 | size_t data_bytes, struct iov_iter *data_iter) | |
716 | { | |
717 | int sgl_count, ret; | |
718 | bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE); | |
719 | ||
720 | if (prot_bytes) { | |
721 | sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes, | |
1a1ff825 | 722 | VHOST_SCSI_PREALLOC_PROT_SGLS); |
e8de56b5 NB |
723 | if (sgl_count < 0) |
724 | return sgl_count; | |
725 | ||
726 | sg_init_table(cmd->tvc_prot_sgl, sgl_count); | |
727 | cmd->tvc_prot_sgl_count = sgl_count; | |
728 | pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__, | |
729 | cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count); | |
730 | ||
731 | ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter, | |
732 | cmd->tvc_prot_sgl, | |
733 | cmd->tvc_prot_sgl_count); | |
e31885dd | 734 | if (ret < 0) { |
e31885dd NB |
735 | cmd->tvc_prot_sgl_count = 0; |
736 | return ret; | |
737 | } | |
e8de56b5 NB |
738 | } |
739 | sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes, | |
1a1ff825 | 740 | VHOST_SCSI_PREALLOC_SGLS); |
e8de56b5 NB |
741 | if (sgl_count < 0) |
742 | return sgl_count; | |
743 | ||
744 | sg_init_table(cmd->tvc_sgl, sgl_count); | |
745 | cmd->tvc_sgl_count = sgl_count; | |
746 | pr_debug("%s data_sg %p data_sgl_count %u\n", __func__, | |
747 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
748 | ||
749 | ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter, | |
750 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
751 | if (ret < 0) { | |
752 | cmd->tvc_sgl_count = 0; | |
753 | return ret; | |
e31885dd NB |
754 | } |
755 | return 0; | |
756 | } | |
757 | ||
46243860 NB |
758 | static int vhost_scsi_to_tcm_attr(int attr) |
759 | { | |
760 | switch (attr) { | |
761 | case VIRTIO_SCSI_S_SIMPLE: | |
762 | return TCM_SIMPLE_TAG; | |
763 | case VIRTIO_SCSI_S_ORDERED: | |
764 | return TCM_ORDERED_TAG; | |
765 | case VIRTIO_SCSI_S_HEAD: | |
766 | return TCM_HEAD_TAG; | |
767 | case VIRTIO_SCSI_S_ACA: | |
768 | return TCM_ACA_TAG; | |
769 | default: | |
770 | break; | |
771 | } | |
772 | return TCM_SIMPLE_TAG; | |
773 | } | |
774 | ||
1a1ff825 | 775 | static void vhost_scsi_submission_work(struct work_struct *work) |
057cbf49 | 776 | { |
1a1ff825 NB |
777 | struct vhost_scsi_cmd *cmd = |
778 | container_of(work, struct vhost_scsi_cmd, work); | |
779 | struct vhost_scsi_nexus *tv_nexus; | |
3c63f66a | 780 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
95e7c434 NB |
781 | struct scatterlist *sg_ptr, *sg_prot_ptr = NULL; |
782 | int rc; | |
057cbf49 | 783 | |
95e7c434 | 784 | /* FIXME: BIDI operation */ |
3c63f66a AH |
785 | if (cmd->tvc_sgl_count) { |
786 | sg_ptr = cmd->tvc_sgl; | |
95e7c434 NB |
787 | |
788 | if (cmd->tvc_prot_sgl_count) | |
789 | sg_prot_ptr = cmd->tvc_prot_sgl; | |
790 | else | |
791 | se_cmd->prot_pto = true; | |
057cbf49 NB |
792 | } else { |
793 | sg_ptr = NULL; | |
794 | } | |
3c63f66a | 795 | tv_nexus = cmd->tvc_nexus; |
9f0abc15 | 796 | |
649ee054 | 797 | se_cmd->tag = 0; |
9f0abc15 | 798 | rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, |
3c63f66a AH |
799 | cmd->tvc_cdb, &cmd->tvc_sense_buf[0], |
800 | cmd->tvc_lun, cmd->tvc_exp_data_len, | |
46243860 NB |
801 | vhost_scsi_to_tcm_attr(cmd->tvc_task_attr), |
802 | cmd->tvc_data_direction, TARGET_SCF_ACK_KREF, | |
803 | sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr, | |
804 | cmd->tvc_prot_sgl_count); | |
057cbf49 NB |
805 | if (rc < 0) { |
806 | transport_send_check_condition_and_sense(se_cmd, | |
9f0abc15 | 807 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
057cbf49 | 808 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 809 | } |
057cbf49 NB |
810 | } |
811 | ||
683bd967 AH |
812 | static void |
813 | vhost_scsi_send_bad_target(struct vhost_scsi *vs, | |
814 | struct vhost_virtqueue *vq, | |
815 | int head, unsigned out) | |
637ab21e AH |
816 | { |
817 | struct virtio_scsi_cmd_resp __user *resp; | |
818 | struct virtio_scsi_cmd_resp rsp; | |
819 | int ret; | |
820 | ||
821 | memset(&rsp, 0, sizeof(rsp)); | |
822 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
823 | resp = vq->iov[out].iov_base; | |
824 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
825 | if (!ret) | |
826 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
827 | else | |
828 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
829 | } | |
830 | ||
683bd967 AH |
831 | static void |
832 | vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
057cbf49 | 833 | { |
1a1ff825 | 834 | struct vhost_scsi_tpg **vs_tpg, *tpg; |
057cbf49 | 835 | struct virtio_scsi_cmd_req v_req; |
95e7c434 | 836 | struct virtio_scsi_cmd_req_pi v_req_pi; |
1a1ff825 | 837 | struct vhost_scsi_cmd *cmd; |
09b13fa8 | 838 | struct iov_iter out_iter, in_iter, prot_iter, data_iter; |
95e7c434 | 839 | u64 tag; |
09b13fa8 | 840 | u32 exp_data_len, data_direction; |
532e15af | 841 | unsigned int out = 0, in = 0; |
09b13fa8 NB |
842 | int head, ret, prot_bytes; |
843 | size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp); | |
844 | size_t out_size, in_size; | |
95e7c434 NB |
845 | u16 lun; |
846 | u8 *target, *lunp, task_attr; | |
09b13fa8 | 847 | bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI); |
95e7c434 | 848 | void *req, *cdb; |
057cbf49 | 849 | |
e7802212 | 850 | mutex_lock(&vq->mutex); |
4f7f46d3 AH |
851 | /* |
852 | * We can handle the vq only after the endpoint is setup by calling the | |
853 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
4f7f46d3 | 854 | */ |
e7802212 | 855 | vs_tpg = vq->private_data; |
4f7f46d3 | 856 | if (!vs_tpg) |
e7802212 | 857 | goto out; |
057cbf49 | 858 | |
057cbf49 NB |
859 | vhost_disable_notify(&vs->dev, vq); |
860 | ||
861 | for (;;) { | |
47283bef | 862 | head = vhost_get_vq_desc(vq, vq->iov, |
09b13fa8 NB |
863 | ARRAY_SIZE(vq->iov), &out, &in, |
864 | NULL, NULL); | |
057cbf49 | 865 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", |
09b13fa8 | 866 | head, out, in); |
057cbf49 NB |
867 | /* On error, stop handling until the next kick. */ |
868 | if (unlikely(head < 0)) | |
869 | break; | |
870 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
871 | if (head == vq->num) { | |
872 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
873 | vhost_disable_notify(&vs->dev, vq); | |
874 | continue; | |
875 | } | |
876 | break; | |
877 | } | |
057cbf49 | 878 | /* |
09b13fa8 NB |
879 | * Check for a sane response buffer so we can report early |
880 | * errors back to the guest. | |
057cbf49 | 881 | */ |
09b13fa8 NB |
882 | if (unlikely(vq->iov[out].iov_len < rsp_size)) { |
883 | vq_err(vq, "Expecting at least virtio_scsi_cmd_resp" | |
884 | " size, got %zu bytes\n", vq->iov[out].iov_len); | |
057cbf49 NB |
885 | break; |
886 | } | |
09b13fa8 NB |
887 | /* |
888 | * Setup pointers and values based upon different virtio-scsi | |
889 | * request header if T10_PI is enabled in KVM guest. | |
890 | */ | |
891 | if (t10_pi) { | |
95e7c434 | 892 | req = &v_req_pi; |
09b13fa8 | 893 | req_size = sizeof(v_req_pi); |
95e7c434 NB |
894 | lunp = &v_req_pi.lun[0]; |
895 | target = &v_req_pi.lun[1]; | |
95e7c434 NB |
896 | } else { |
897 | req = &v_req; | |
09b13fa8 | 898 | req_size = sizeof(v_req); |
95e7c434 NB |
899 | lunp = &v_req.lun[0]; |
900 | target = &v_req.lun[1]; | |
95e7c434 | 901 | } |
09b13fa8 NB |
902 | /* |
903 | * FIXME: Not correct for BIDI operation | |
904 | */ | |
905 | out_size = iov_length(vq->iov, out); | |
906 | in_size = iov_length(&vq->iov[out], in); | |
95e7c434 | 907 | |
09b13fa8 NB |
908 | /* |
909 | * Copy over the virtio-scsi request header, which for a | |
910 | * ANY_LAYOUT enabled guest may span multiple iovecs, or a | |
911 | * single iovec may contain both the header + outgoing | |
912 | * WRITE payloads. | |
913 | * | |
914 | * copy_from_iter() will advance out_iter, so that it will | |
915 | * point at the start of the outgoing WRITE payload, if | |
916 | * DMA_TO_DEVICE is set. | |
917 | */ | |
918 | iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size); | |
057cbf49 | 919 | |
cbbd26b8 | 920 | if (unlikely(!copy_from_iter_full(req, req_size, &out_iter))) { |
09b13fa8 | 921 | vq_err(vq, "Faulted on copy_from_iter\n"); |
de1419e4 NB |
922 | vhost_scsi_send_bad_target(vs, vq, head, out); |
923 | continue; | |
057cbf49 | 924 | } |
7fe412d0 | 925 | /* virtio-scsi spec requires byte 0 of the lun to be 1 */ |
95e7c434 | 926 | if (unlikely(*lunp != 1)) { |
09b13fa8 | 927 | vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp); |
7fe412d0 VS |
928 | vhost_scsi_send_bad_target(vs, vq, head, out); |
929 | continue; | |
930 | } | |
931 | ||
95e7c434 | 932 | tpg = ACCESS_ONCE(vs_tpg[*target]); |
98718312 | 933 | if (unlikely(!tpg)) { |
09b13fa8 | 934 | /* Target does not exist, fail the request */ |
637ab21e | 935 | vhost_scsi_send_bad_target(vs, vq, head, out); |
67e18cf9 AH |
936 | continue; |
937 | } | |
95e7c434 | 938 | /* |
09b13fa8 NB |
939 | * Determine data_direction by calculating the total outgoing |
940 | * iovec sizes + incoming iovec sizes vs. virtio-scsi request + | |
941 | * response headers respectively. | |
95e7c434 | 942 | * |
09b13fa8 NB |
943 | * For DMA_TO_DEVICE this is out_iter, which is already pointing |
944 | * to the right place. | |
945 | * | |
946 | * For DMA_FROM_DEVICE, the iovec will be just past the end | |
947 | * of the virtio-scsi response header in either the same | |
948 | * or immediately following iovec. | |
95e7c434 | 949 | * |
09b13fa8 NB |
950 | * Any associated T10_PI bytes for the outgoing / incoming |
951 | * payloads are included in calculation of exp_data_len here. | |
95e7c434 | 952 | */ |
09b13fa8 NB |
953 | prot_bytes = 0; |
954 | ||
955 | if (out_size > req_size) { | |
956 | data_direction = DMA_TO_DEVICE; | |
957 | exp_data_len = out_size - req_size; | |
958 | data_iter = out_iter; | |
959 | } else if (in_size > rsp_size) { | |
960 | data_direction = DMA_FROM_DEVICE; | |
961 | exp_data_len = in_size - rsp_size; | |
962 | ||
963 | iov_iter_init(&in_iter, READ, &vq->iov[out], in, | |
964 | rsp_size + exp_data_len); | |
965 | iov_iter_advance(&in_iter, rsp_size); | |
966 | data_iter = in_iter; | |
967 | } else { | |
968 | data_direction = DMA_NONE; | |
969 | exp_data_len = 0; | |
970 | } | |
971 | /* | |
972 | * If T10_PI header + payload is present, setup prot_iter values | |
973 | * and recalculate data_iter for vhost_scsi_mapal() mapping to | |
974 | * host scatterlists via get_user_pages_fast(). | |
95e7c434 | 975 | */ |
09b13fa8 | 976 | if (t10_pi) { |
95e7c434 NB |
977 | if (v_req_pi.pi_bytesout) { |
978 | if (data_direction != DMA_TO_DEVICE) { | |
09b13fa8 NB |
979 | vq_err(vq, "Received non zero pi_bytesout," |
980 | " but wrong data_direction\n"); | |
de1419e4 NB |
981 | vhost_scsi_send_bad_target(vs, vq, head, out); |
982 | continue; | |
95e7c434 | 983 | } |
e72fd72e | 984 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout); |
95e7c434 NB |
985 | } else if (v_req_pi.pi_bytesin) { |
986 | if (data_direction != DMA_FROM_DEVICE) { | |
09b13fa8 NB |
987 | vq_err(vq, "Received non zero pi_bytesin," |
988 | " but wrong data_direction\n"); | |
de1419e4 NB |
989 | vhost_scsi_send_bad_target(vs, vq, head, out); |
990 | continue; | |
95e7c434 | 991 | } |
e72fd72e | 992 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin); |
95e7c434 | 993 | } |
09b13fa8 NB |
994 | /* |
995 | * Set prot_iter to data_iter, and advance past any | |
996 | * preceeding prot_bytes that may be present. | |
997 | * | |
998 | * Also fix up the exp_data_len to reflect only the | |
999 | * actual data payload length. | |
1000 | */ | |
95e7c434 | 1001 | if (prot_bytes) { |
09b13fa8 NB |
1002 | exp_data_len -= prot_bytes; |
1003 | prot_iter = data_iter; | |
1004 | iov_iter_advance(&data_iter, prot_bytes); | |
95e7c434 | 1005 | } |
e72fd72e | 1006 | tag = vhost64_to_cpu(vq, v_req_pi.tag); |
95e7c434 NB |
1007 | task_attr = v_req_pi.task_attr; |
1008 | cdb = &v_req_pi.cdb[0]; | |
1009 | lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF; | |
1010 | } else { | |
e72fd72e | 1011 | tag = vhost64_to_cpu(vq, v_req.tag); |
95e7c434 NB |
1012 | task_attr = v_req.task_attr; |
1013 | cdb = &v_req.cdb[0]; | |
1014 | lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; | |
1015 | } | |
95e7c434 | 1016 | /* |
09b13fa8 NB |
1017 | * Check that the received CDB size does not exceeded our |
1018 | * hardcoded max for vhost-scsi, then get a pre-allocated | |
1019 | * cmd descriptor for the new virtio-scsi tag. | |
95e7c434 NB |
1020 | * |
1021 | * TODO what if cdb was too small for varlen cdb header? | |
1022 | */ | |
1a1ff825 | 1023 | if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) { |
95e7c434 NB |
1024 | vq_err(vq, "Received SCSI CDB with command_size: %d that" |
1025 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
1a1ff825 | 1026 | scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE); |
de1419e4 NB |
1027 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1028 | continue; | |
95e7c434 | 1029 | } |
95e7c434 | 1030 | cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr, |
9f977ef7 NB |
1031 | exp_data_len + prot_bytes, |
1032 | data_direction); | |
3c63f66a | 1033 | if (IS_ERR(cmd)) { |
4824d3bf | 1034 | vq_err(vq, "vhost_scsi_get_tag failed %ld\n", |
09b13fa8 | 1035 | PTR_ERR(cmd)); |
de1419e4 NB |
1036 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1037 | continue; | |
057cbf49 | 1038 | } |
3c63f66a AH |
1039 | cmd->tvc_vhost = vs; |
1040 | cmd->tvc_vq = vq; | |
a77ec83a | 1041 | cmd->tvc_resp_iov = vq->iov[out]; |
79c14141 | 1042 | cmd->tvc_in_iovs = in; |
057cbf49 | 1043 | |
057cbf49 | 1044 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", |
09b13fa8 NB |
1045 | cmd->tvc_cdb[0], cmd->tvc_lun); |
1046 | pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:" | |
1047 | " %d\n", cmd, exp_data_len, prot_bytes, data_direction); | |
057cbf49 NB |
1048 | |
1049 | if (data_direction != DMA_NONE) { | |
09b13fa8 NB |
1050 | ret = vhost_scsi_mapal(cmd, |
1051 | prot_bytes, &prot_iter, | |
1052 | exp_data_len, &data_iter); | |
057cbf49 NB |
1053 | if (unlikely(ret)) { |
1054 | vq_err(vq, "Failed to map iov to sgl\n"); | |
1a1ff825 | 1055 | vhost_scsi_release_cmd(&cmd->tvc_se_cmd); |
de1419e4 NB |
1056 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1057 | continue; | |
057cbf49 NB |
1058 | } |
1059 | } | |
057cbf49 NB |
1060 | /* |
1061 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
1062 | * complete the virtio-scsi request in TCM callback context via | |
09b13fa8 | 1063 | * vhost_scsi_queue_data_in() and vhost_scsi_queue_status() |
057cbf49 | 1064 | */ |
3c63f66a | 1065 | cmd->tvc_vq_desc = head; |
057cbf49 | 1066 | /* |
09b13fa8 NB |
1067 | * Dispatch cmd descriptor for cmwq execution in process |
1068 | * context provided by vhost_scsi_workqueue. This also ensures | |
1069 | * cmd is executed on the same kworker CPU as this vhost | |
1070 | * thread to gain positive L2 cache locality effects. | |
057cbf49 | 1071 | */ |
1a1ff825 NB |
1072 | INIT_WORK(&cmd->work, vhost_scsi_submission_work); |
1073 | queue_work(vhost_scsi_workqueue, &cmd->work); | |
057cbf49 | 1074 | } |
e7802212 | 1075 | out: |
7ea206cf | 1076 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
1077 | } |
1078 | ||
1079 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) | |
1080 | { | |
101998f6 | 1081 | pr_debug("%s: The handling func for control queue.\n", __func__); |
057cbf49 NB |
1082 | } |
1083 | ||
683bd967 | 1084 | static void |
1a1ff825 NB |
1085 | vhost_scsi_send_evt(struct vhost_scsi *vs, |
1086 | struct vhost_scsi_tpg *tpg, | |
683bd967 AH |
1087 | struct se_lun *lun, |
1088 | u32 event, | |
1089 | u32 reason) | |
a6c9af87 | 1090 | { |
1a1ff825 | 1091 | struct vhost_scsi_evt *evt; |
a6c9af87 | 1092 | |
1a1ff825 | 1093 | evt = vhost_scsi_allocate_evt(vs, event, reason); |
a6c9af87 AH |
1094 | if (!evt) |
1095 | return; | |
1096 | ||
1097 | if (tpg && lun) { | |
1098 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
1099 | /* | |
1100 | * Note: evt->event is zeroed when we allocate it and | |
1101 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
1102 | */ | |
1103 | evt->event.lun[0] = 0x01; | |
59c816c1 | 1104 | evt->event.lun[1] = tpg->tport_tpgt; |
a6c9af87 AH |
1105 | if (lun->unpacked_lun >= 256) |
1106 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
1107 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
1108 | } | |
1109 | ||
1110 | llist_add(&evt->list, &vs->vs_event_list); | |
1111 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
1112 | } | |
1113 | ||
057cbf49 NB |
1114 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
1115 | { | |
a6c9af87 AH |
1116 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1117 | poll.work); | |
1118 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1119 | ||
1120 | mutex_lock(&vq->mutex); | |
1121 | if (!vq->private_data) | |
1122 | goto out; | |
1123 | ||
1124 | if (vs->vs_events_missed) | |
1a1ff825 | 1125 | vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); |
a6c9af87 AH |
1126 | out: |
1127 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
1128 | } |
1129 | ||
1130 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
1131 | { | |
1132 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
1133 | poll.work); | |
1134 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1135 | ||
1b7f390e | 1136 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
1137 | } |
1138 | ||
4f7f46d3 AH |
1139 | static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
1140 | { | |
3ab2e420 | 1141 | vhost_poll_flush(&vs->vqs[index].vq.poll); |
4f7f46d3 AH |
1142 | } |
1143 | ||
3dfbff32 | 1144 | /* Callers must hold dev mutex */ |
4f7f46d3 AH |
1145 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
1146 | { | |
f2f0173d | 1147 | struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; |
4f7f46d3 AH |
1148 | int i; |
1149 | ||
f2f0173d | 1150 | /* Init new inflight and remember the old inflight */ |
1a1ff825 | 1151 | vhost_scsi_init_inflight(vs, old_inflight); |
f2f0173d AH |
1152 | |
1153 | /* | |
1154 | * The inflight->kref was initialized to 1. We decrement it here to | |
1155 | * indicate the start of the flush operation so that it will reach 0 | |
1156 | * when all the reqs are finished. | |
1157 | */ | |
1158 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1a1ff825 | 1159 | kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
1160 | |
1161 | /* Flush both the vhost poll and vhost work */ | |
4f7f46d3 AH |
1162 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
1163 | vhost_scsi_flush_vq(vs, i); | |
1164 | vhost_work_flush(&vs->dev, &vs->vs_completion_work); | |
a6c9af87 | 1165 | vhost_work_flush(&vs->dev, &vs->vs_event_work); |
f2f0173d AH |
1166 | |
1167 | /* Wait for all reqs issued before the flush to be finished */ | |
1168 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1169 | wait_for_completion(&old_inflight[i]->comp); | |
4f7f46d3 AH |
1170 | } |
1171 | ||
057cbf49 NB |
1172 | /* |
1173 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
1a1ff825 | 1174 | * vhost_scsi_tpg with an active struct vhost_scsi_nexus |
f2b7daf5 AH |
1175 | * |
1176 | * The lock nesting rule is: | |
1a1ff825 | 1177 | * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex |
057cbf49 | 1178 | */ |
683bd967 AH |
1179 | static int |
1180 | vhost_scsi_set_endpoint(struct vhost_scsi *vs, | |
1181 | struct vhost_scsi_target *t) | |
057cbf49 | 1182 | { |
ab8edab1 | 1183 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1184 | struct vhost_scsi_tport *tv_tport; |
1185 | struct vhost_scsi_tpg *tpg; | |
1186 | struct vhost_scsi_tpg **vs_tpg; | |
4f7f46d3 AH |
1187 | struct vhost_virtqueue *vq; |
1188 | int index, ret, i, len; | |
67e18cf9 | 1189 | bool match = false; |
057cbf49 | 1190 | |
1a1ff825 | 1191 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 1192 | mutex_lock(&vs->dev.mutex); |
f2b7daf5 | 1193 | |
057cbf49 NB |
1194 | /* Verify that ring has been setup correctly. */ |
1195 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
1196 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 1197 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
1198 | ret = -EFAULT; |
1199 | goto out; | |
057cbf49 NB |
1200 | } |
1201 | } | |
057cbf49 | 1202 | |
4f7f46d3 AH |
1203 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
1204 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
1205 | if (!vs_tpg) { | |
f2b7daf5 AH |
1206 | ret = -ENOMEM; |
1207 | goto out; | |
4f7f46d3 AH |
1208 | } |
1209 | if (vs->vs_tpg) | |
1210 | memcpy(vs_tpg, vs->vs_tpg, len); | |
1211 | ||
1a1ff825 | 1212 | list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) { |
98718312 AH |
1213 | mutex_lock(&tpg->tv_tpg_mutex); |
1214 | if (!tpg->tpg_nexus) { | |
1215 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1216 | continue; |
1217 | } | |
98718312 AH |
1218 | if (tpg->tv_tpg_vhost_count != 0) { |
1219 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1220 | continue; |
1221 | } | |
98718312 | 1222 | tv_tport = tpg->tport; |
057cbf49 | 1223 | |
67e18cf9 | 1224 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
98718312 | 1225 | if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
4f7f46d3 | 1226 | kfree(vs_tpg); |
98718312 | 1227 | mutex_unlock(&tpg->tv_tpg_mutex); |
f2b7daf5 AH |
1228 | ret = -EEXIST; |
1229 | goto out; | |
101998f6 | 1230 | } |
ab8edab1 NB |
1231 | /* |
1232 | * In order to ensure individual vhost-scsi configfs | |
1233 | * groups cannot be removed while in use by vhost ioctl, | |
1234 | * go ahead and take an explicit se_tpg->tpg_group.cg_item | |
1235 | * dependency now. | |
1236 | */ | |
1237 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1238 | ret = target_depend_item(&se_tpg->tpg_group.cg_item); |
ab8edab1 NB |
1239 | if (ret) { |
1240 | pr_warn("configfs_depend_item() failed: %d\n", ret); | |
1241 | kfree(vs_tpg); | |
1242 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1243 | goto out; | |
1244 | } | |
98718312 AH |
1245 | tpg->tv_tpg_vhost_count++; |
1246 | tpg->vhost_scsi = vs; | |
1247 | vs_tpg[tpg->tport_tpgt] = tpg; | |
4e857c58 | 1248 | smp_mb__after_atomic(); |
67e18cf9 | 1249 | match = true; |
057cbf49 | 1250 | } |
98718312 | 1251 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1252 | } |
67e18cf9 AH |
1253 | |
1254 | if (match) { | |
1255 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1256 | sizeof(vs->vs_vhost_wwpn)); | |
4f7f46d3 | 1257 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
3ab2e420 | 1258 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1259 | mutex_lock(&vq->mutex); |
22fa90c7 | 1260 | vq->private_data = vs_tpg; |
80f7d030 | 1261 | vhost_vq_init_access(vq); |
4f7f46d3 AH |
1262 | mutex_unlock(&vq->mutex); |
1263 | } | |
67e18cf9 AH |
1264 | ret = 0; |
1265 | } else { | |
1266 | ret = -EEXIST; | |
1267 | } | |
1268 | ||
4f7f46d3 AH |
1269 | /* |
1270 | * Act as synchronize_rcu to make sure access to | |
1271 | * old vs->vs_tpg is finished. | |
1272 | */ | |
1273 | vhost_scsi_flush(vs); | |
1274 | kfree(vs->vs_tpg); | |
1275 | vs->vs_tpg = vs_tpg; | |
1276 | ||
f2b7daf5 | 1277 | out: |
67e18cf9 | 1278 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1279 | mutex_unlock(&vhost_scsi_mutex); |
67e18cf9 | 1280 | return ret; |
057cbf49 NB |
1281 | } |
1282 | ||
683bd967 AH |
1283 | static int |
1284 | vhost_scsi_clear_endpoint(struct vhost_scsi *vs, | |
1285 | struct vhost_scsi_target *t) | |
057cbf49 | 1286 | { |
ab8edab1 | 1287 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1288 | struct vhost_scsi_tport *tv_tport; |
1289 | struct vhost_scsi_tpg *tpg; | |
4f7f46d3 AH |
1290 | struct vhost_virtqueue *vq; |
1291 | bool match = false; | |
67e18cf9 AH |
1292 | int index, ret, i; |
1293 | u8 target; | |
057cbf49 | 1294 | |
1a1ff825 | 1295 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 NB |
1296 | mutex_lock(&vs->dev.mutex); |
1297 | /* Verify that ring has been setup correctly. */ | |
1298 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1299 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1300 | ret = -EFAULT; |
038e0af4 | 1301 | goto err_dev; |
057cbf49 NB |
1302 | } |
1303 | } | |
4f7f46d3 AH |
1304 | |
1305 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1306 | ret = 0; |
1307 | goto err_dev; | |
4f7f46d3 AH |
1308 | } |
1309 | ||
67e18cf9 AH |
1310 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1311 | target = i; | |
98718312 AH |
1312 | tpg = vs->vs_tpg[target]; |
1313 | if (!tpg) | |
67e18cf9 AH |
1314 | continue; |
1315 | ||
98718312 AH |
1316 | mutex_lock(&tpg->tv_tpg_mutex); |
1317 | tv_tport = tpg->tport; | |
67e18cf9 AH |
1318 | if (!tv_tport) { |
1319 | ret = -ENODEV; | |
038e0af4 | 1320 | goto err_tpg; |
67e18cf9 AH |
1321 | } |
1322 | ||
1323 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
98718312 | 1324 | pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" |
67e18cf9 | 1325 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", |
98718312 | 1326 | tv_tport->tport_name, tpg->tport_tpgt, |
67e18cf9 AH |
1327 | t->vhost_wwpn, t->vhost_tpgt); |
1328 | ret = -EINVAL; | |
038e0af4 | 1329 | goto err_tpg; |
67e18cf9 | 1330 | } |
98718312 AH |
1331 | tpg->tv_tpg_vhost_count--; |
1332 | tpg->vhost_scsi = NULL; | |
67e18cf9 | 1333 | vs->vs_tpg[target] = NULL; |
4f7f46d3 | 1334 | match = true; |
98718312 | 1335 | mutex_unlock(&tpg->tv_tpg_mutex); |
ab8edab1 NB |
1336 | /* |
1337 | * Release se_tpg->tpg_group.cg_item configfs dependency now | |
1338 | * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur. | |
1339 | */ | |
1340 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1341 | target_undepend_item(&se_tpg->tpg_group.cg_item); |
057cbf49 | 1342 | } |
4f7f46d3 AH |
1343 | if (match) { |
1344 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
3ab2e420 | 1345 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1346 | mutex_lock(&vq->mutex); |
22fa90c7 | 1347 | vq->private_data = NULL; |
4f7f46d3 AH |
1348 | mutex_unlock(&vq->mutex); |
1349 | } | |
1350 | } | |
1351 | /* | |
1352 | * Act as synchronize_rcu to make sure access to | |
1353 | * old vs->vs_tpg is finished. | |
1354 | */ | |
1355 | vhost_scsi_flush(vs); | |
1356 | kfree(vs->vs_tpg); | |
1357 | vs->vs_tpg = NULL; | |
a6c9af87 | 1358 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1359 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1360 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 1361 | return 0; |
101998f6 | 1362 | |
038e0af4 | 1363 | err_tpg: |
98718312 | 1364 | mutex_unlock(&tpg->tv_tpg_mutex); |
038e0af4 | 1365 | err_dev: |
101998f6 | 1366 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1367 | mutex_unlock(&vhost_scsi_mutex); |
101998f6 | 1368 | return ret; |
057cbf49 NB |
1369 | } |
1370 | ||
4f7f46d3 AH |
1371 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1372 | { | |
ea16c514 MT |
1373 | struct vhost_virtqueue *vq; |
1374 | int i; | |
1375 | ||
4f7f46d3 AH |
1376 | if (features & ~VHOST_SCSI_FEATURES) |
1377 | return -EOPNOTSUPP; | |
1378 | ||
1379 | mutex_lock(&vs->dev.mutex); | |
1380 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1381 | !vhost_log_access_ok(&vs->dev)) { | |
1382 | mutex_unlock(&vs->dev.mutex); | |
1383 | return -EFAULT; | |
1384 | } | |
ea16c514 MT |
1385 | |
1386 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
1387 | vq = &vs->vqs[i].vq; | |
1388 | mutex_lock(&vq->mutex); | |
1389 | vq->acked_features = features; | |
1390 | mutex_unlock(&vq->mutex); | |
1391 | } | |
4f7f46d3 AH |
1392 | mutex_unlock(&vs->dev.mutex); |
1393 | return 0; | |
1394 | } | |
1395 | ||
057cbf49 NB |
1396 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1397 | { | |
c7289312 | 1398 | struct vhost_scsi *vs; |
3ab2e420 | 1399 | struct vhost_virtqueue **vqs; |
595cb754 | 1400 | int r = -ENOMEM, i; |
057cbf49 | 1401 | |
dcda9b04 | 1402 | vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_RETRY_MAYFAIL); |
595cb754 MT |
1403 | if (!vs) { |
1404 | vs = vzalloc(sizeof(*vs)); | |
1405 | if (!vs) | |
1406 | goto err_vs; | |
1407 | } | |
057cbf49 | 1408 | |
3ab2e420 | 1409 | vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL); |
595cb754 MT |
1410 | if (!vqs) |
1411 | goto err_vqs; | |
3ab2e420 | 1412 | |
c7289312 | 1413 | vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); |
1a1ff825 | 1414 | vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work); |
a6c9af87 | 1415 | |
c7289312 AH |
1416 | vs->vs_events_nr = 0; |
1417 | vs->vs_events_missed = false; | |
057cbf49 | 1418 | |
c7289312 AH |
1419 | vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; |
1420 | vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1421 | vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1422 | vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
3ab2e420 | 1423 | for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { |
c7289312 AH |
1424 | vqs[i] = &vs->vqs[i].vq; |
1425 | vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
3ab2e420 | 1426 | } |
59566b6e | 1427 | vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ); |
f2f0173d | 1428 | |
1a1ff825 | 1429 | vhost_scsi_init_inflight(vs, NULL); |
f2f0173d | 1430 | |
c7289312 | 1431 | f->private_data = vs; |
057cbf49 | 1432 | return 0; |
595cb754 | 1433 | |
595cb754 | 1434 | err_vqs: |
68404441 | 1435 | kvfree(vs); |
595cb754 MT |
1436 | err_vs: |
1437 | return r; | |
057cbf49 NB |
1438 | } |
1439 | ||
1440 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1441 | { | |
c7289312 | 1442 | struct vhost_scsi *vs = f->private_data; |
67e18cf9 | 1443 | struct vhost_scsi_target t; |
057cbf49 | 1444 | |
c7289312 AH |
1445 | mutex_lock(&vs->dev.mutex); |
1446 | memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1447 | mutex_unlock(&vs->dev.mutex); | |
1448 | vhost_scsi_clear_endpoint(vs, &t); | |
1449 | vhost_dev_stop(&vs->dev); | |
1450 | vhost_dev_cleanup(&vs->dev, false); | |
a6c9af87 | 1451 | /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
c7289312 AH |
1452 | vhost_scsi_flush(vs); |
1453 | kfree(vs->dev.vqs); | |
68404441 | 1454 | kvfree(vs); |
057cbf49 NB |
1455 | return 0; |
1456 | } | |
1457 | ||
683bd967 AH |
1458 | static long |
1459 | vhost_scsi_ioctl(struct file *f, | |
1460 | unsigned int ioctl, | |
1461 | unsigned long arg) | |
057cbf49 NB |
1462 | { |
1463 | struct vhost_scsi *vs = f->private_data; | |
1464 | struct vhost_scsi_target backend; | |
1465 | void __user *argp = (void __user *)arg; | |
1466 | u64 __user *featurep = argp; | |
11c63418 AH |
1467 | u32 __user *eventsp = argp; |
1468 | u32 events_missed; | |
057cbf49 | 1469 | u64 features; |
101998f6 | 1470 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1471 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1472 | |
1473 | switch (ioctl) { | |
1474 | case VHOST_SCSI_SET_ENDPOINT: | |
1475 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1476 | return -EFAULT; | |
6de7145c MT |
1477 | if (backend.reserved != 0) |
1478 | return -EOPNOTSUPP; | |
057cbf49 NB |
1479 | |
1480 | return vhost_scsi_set_endpoint(vs, &backend); | |
1481 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1482 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1483 | return -EFAULT; | |
6de7145c MT |
1484 | if (backend.reserved != 0) |
1485 | return -EOPNOTSUPP; | |
057cbf49 NB |
1486 | |
1487 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1488 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1489 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1490 | return -EFAULT; |
1491 | return 0; | |
11c63418 AH |
1492 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1493 | if (get_user(events_missed, eventsp)) | |
1494 | return -EFAULT; | |
1495 | mutex_lock(&vq->mutex); | |
1496 | vs->vs_events_missed = events_missed; | |
1497 | mutex_unlock(&vq->mutex); | |
1498 | return 0; | |
1499 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1500 | mutex_lock(&vq->mutex); | |
1501 | events_missed = vs->vs_events_missed; | |
1502 | mutex_unlock(&vq->mutex); | |
1503 | if (put_user(events_missed, eventsp)) | |
1504 | return -EFAULT; | |
1505 | return 0; | |
057cbf49 | 1506 | case VHOST_GET_FEATURES: |
5dade710 | 1507 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1508 | if (copy_to_user(featurep, &features, sizeof features)) |
1509 | return -EFAULT; | |
1510 | return 0; | |
1511 | case VHOST_SET_FEATURES: | |
1512 | if (copy_from_user(&features, featurep, sizeof features)) | |
1513 | return -EFAULT; | |
1514 | return vhost_scsi_set_features(vs, features); | |
1515 | default: | |
1516 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1517 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1518 | /* TODO: flush backend after dev ioctl. */ | |
1519 | if (r == -ENOIOCTLCMD) | |
1520 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1521 | mutex_unlock(&vs->dev.mutex); |
1522 | return r; | |
1523 | } | |
1524 | } | |
1525 | ||
101998f6 NB |
1526 | #ifdef CONFIG_COMPAT |
1527 | static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, | |
1528 | unsigned long arg) | |
1529 | { | |
1530 | return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1531 | } | |
1532 | #endif | |
1533 | ||
057cbf49 NB |
1534 | static const struct file_operations vhost_scsi_fops = { |
1535 | .owner = THIS_MODULE, | |
1536 | .release = vhost_scsi_release, | |
1537 | .unlocked_ioctl = vhost_scsi_ioctl, | |
101998f6 NB |
1538 | #ifdef CONFIG_COMPAT |
1539 | .compat_ioctl = vhost_scsi_compat_ioctl, | |
1540 | #endif | |
057cbf49 NB |
1541 | .open = vhost_scsi_open, |
1542 | .llseek = noop_llseek, | |
1543 | }; | |
1544 | ||
1545 | static struct miscdevice vhost_scsi_misc = { | |
1546 | MISC_DYNAMIC_MINOR, | |
1547 | "vhost-scsi", | |
1548 | &vhost_scsi_fops, | |
1549 | }; | |
1550 | ||
1551 | static int __init vhost_scsi_register(void) | |
1552 | { | |
1553 | return misc_register(&vhost_scsi_misc); | |
1554 | } | |
1555 | ||
f368ed60 | 1556 | static void vhost_scsi_deregister(void) |
057cbf49 | 1557 | { |
f368ed60 | 1558 | misc_deregister(&vhost_scsi_misc); |
057cbf49 NB |
1559 | } |
1560 | ||
1a1ff825 | 1561 | static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport) |
057cbf49 NB |
1562 | { |
1563 | switch (tport->tport_proto_id) { | |
1564 | case SCSI_PROTOCOL_SAS: | |
1565 | return "SAS"; | |
1566 | case SCSI_PROTOCOL_FCP: | |
1567 | return "FCP"; | |
1568 | case SCSI_PROTOCOL_ISCSI: | |
1569 | return "iSCSI"; | |
1570 | default: | |
1571 | break; | |
1572 | } | |
1573 | ||
1574 | return "Unknown"; | |
1575 | } | |
1576 | ||
683bd967 | 1577 | static void |
1a1ff825 | 1578 | vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg, |
683bd967 | 1579 | struct se_lun *lun, bool plug) |
a6c9af87 AH |
1580 | { |
1581 | ||
1582 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1583 | struct vhost_virtqueue *vq; | |
1584 | u32 reason; | |
1585 | ||
1586 | if (!vs) | |
1587 | return; | |
1588 | ||
1589 | mutex_lock(&vs->dev.mutex); | |
a6c9af87 AH |
1590 | |
1591 | if (plug) | |
1592 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1593 | else | |
1594 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1595 | ||
3ab2e420 | 1596 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 | 1597 | mutex_lock(&vq->mutex); |
ea16c514 | 1598 | if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG)) |
1a1ff825 | 1599 | vhost_scsi_send_evt(vs, tpg, lun, |
ea16c514 | 1600 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); |
a6c9af87 AH |
1601 | mutex_unlock(&vq->mutex); |
1602 | mutex_unlock(&vs->dev.mutex); | |
1603 | } | |
1604 | ||
1a1ff825 | 1605 | static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1606 | { |
1a1ff825 | 1607 | vhost_scsi_do_plug(tpg, lun, true); |
a6c9af87 AH |
1608 | } |
1609 | ||
1a1ff825 | 1610 | static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1611 | { |
1a1ff825 | 1612 | vhost_scsi_do_plug(tpg, lun, false); |
a6c9af87 AH |
1613 | } |
1614 | ||
1a1ff825 | 1615 | static int vhost_scsi_port_link(struct se_portal_group *se_tpg, |
683bd967 | 1616 | struct se_lun *lun) |
057cbf49 | 1617 | { |
1a1ff825 NB |
1618 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1619 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1620 | |
1a1ff825 | 1621 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1622 | |
98718312 AH |
1623 | mutex_lock(&tpg->tv_tpg_mutex); |
1624 | tpg->tv_tpg_port_count++; | |
1625 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 | 1626 | |
1a1ff825 | 1627 | vhost_scsi_hotplug(tpg, lun); |
a6c9af87 | 1628 | |
1a1ff825 | 1629 | mutex_unlock(&vhost_scsi_mutex); |
a6c9af87 | 1630 | |
057cbf49 NB |
1631 | return 0; |
1632 | } | |
1633 | ||
1a1ff825 | 1634 | static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg, |
683bd967 | 1635 | struct se_lun *lun) |
057cbf49 | 1636 | { |
1a1ff825 NB |
1637 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1638 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1639 | |
1a1ff825 | 1640 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1641 | |
98718312 AH |
1642 | mutex_lock(&tpg->tv_tpg_mutex); |
1643 | tpg->tv_tpg_port_count--; | |
1644 | mutex_unlock(&tpg->tv_tpg_mutex); | |
a6c9af87 | 1645 | |
1a1ff825 | 1646 | vhost_scsi_hotunplug(tpg, lun); |
a6c9af87 | 1647 | |
1a1ff825 | 1648 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 NB |
1649 | } |
1650 | ||
65ea7898 | 1651 | static void vhost_scsi_free_cmd_map_res(struct se_session *se_sess) |
3aee26b4 | 1652 | { |
1a1ff825 | 1653 | struct vhost_scsi_cmd *tv_cmd; |
3aee26b4 NB |
1654 | unsigned int i; |
1655 | ||
1656 | if (!se_sess->sess_cmd_map) | |
1657 | return; | |
1658 | ||
1a1ff825 NB |
1659 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1660 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 NB |
1661 | |
1662 | kfree(tv_cmd->tvc_sgl); | |
b1935f68 | 1663 | kfree(tv_cmd->tvc_prot_sgl); |
3aee26b4 NB |
1664 | kfree(tv_cmd->tvc_upages); |
1665 | } | |
1666 | } | |
1667 | ||
2eafd729 CH |
1668 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store( |
1669 | struct config_item *item, const char *page, size_t count) | |
b1d75fe5 | 1670 | { |
2eafd729 | 1671 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
b1d75fe5 NB |
1672 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1673 | struct vhost_scsi_tpg, se_tpg); | |
1674 | unsigned long val; | |
1675 | int ret = kstrtoul(page, 0, &val); | |
1676 | ||
1677 | if (ret) { | |
1678 | pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); | |
1679 | return ret; | |
1680 | } | |
1681 | if (val != 0 && val != 1 && val != 3) { | |
1682 | pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val); | |
1683 | return -EINVAL; | |
1684 | } | |
1685 | tpg->tv_fabric_prot_type = val; | |
1686 | ||
1687 | return count; | |
1688 | } | |
1689 | ||
2eafd729 CH |
1690 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show( |
1691 | struct config_item *item, char *page) | |
b1d75fe5 | 1692 | { |
2eafd729 | 1693 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
b1d75fe5 NB |
1694 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1695 | struct vhost_scsi_tpg, se_tpg); | |
1696 | ||
1697 | return sprintf(page, "%d\n", tpg->tv_fabric_prot_type); | |
1698 | } | |
2eafd729 CH |
1699 | |
1700 | CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type); | |
b1d75fe5 NB |
1701 | |
1702 | static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = { | |
2eafd729 | 1703 | &vhost_scsi_tpg_attrib_attr_fabric_prot_type, |
b1d75fe5 NB |
1704 | NULL, |
1705 | }; | |
1706 | ||
65ea7898 NB |
1707 | static int vhost_scsi_nexus_cb(struct se_portal_group *se_tpg, |
1708 | struct se_session *se_sess, void *p) | |
057cbf49 | 1709 | { |
1a1ff825 | 1710 | struct vhost_scsi_cmd *tv_cmd; |
3aee26b4 | 1711 | unsigned int i; |
057cbf49 | 1712 | |
1a1ff825 NB |
1713 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1714 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 NB |
1715 | |
1716 | tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) * | |
1a1ff825 | 1717 | VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL); |
3aee26b4 | 1718 | if (!tv_cmd->tvc_sgl) { |
3aee26b4 NB |
1719 | pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); |
1720 | goto out; | |
1721 | } | |
1722 | ||
1723 | tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) * | |
65ea7898 | 1724 | VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL); |
3aee26b4 | 1725 | if (!tv_cmd->tvc_upages) { |
3aee26b4 NB |
1726 | pr_err("Unable to allocate tv_cmd->tvc_upages\n"); |
1727 | goto out; | |
1728 | } | |
b1935f68 NB |
1729 | |
1730 | tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) * | |
65ea7898 | 1731 | VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL); |
b1935f68 | 1732 | if (!tv_cmd->tvc_prot_sgl) { |
b1935f68 NB |
1733 | pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); |
1734 | goto out; | |
1735 | } | |
3aee26b4 | 1736 | } |
65ea7898 NB |
1737 | return 0; |
1738 | out: | |
1739 | vhost_scsi_free_cmd_map_res(se_sess); | |
1740 | return -ENOMEM; | |
1741 | } | |
1742 | ||
1743 | static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg, | |
1744 | const char *name) | |
1745 | { | |
65ea7898 NB |
1746 | struct vhost_scsi_nexus *tv_nexus; |
1747 | ||
1748 | mutex_lock(&tpg->tv_tpg_mutex); | |
1749 | if (tpg->tpg_nexus) { | |
1750 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1751 | pr_debug("tpg->tpg_nexus already exists\n"); | |
1752 | return -EEXIST; | |
1753 | } | |
65ea7898 NB |
1754 | |
1755 | tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL); | |
1756 | if (!tv_nexus) { | |
1757 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1758 | pr_err("Unable to allocate struct vhost_scsi_nexus\n"); | |
1759 | return -ENOMEM; | |
1760 | } | |
057cbf49 NB |
1761 | /* |
1762 | * Since we are running in 'demo mode' this call with generate a | |
1a1ff825 | 1763 | * struct se_node_acl for the vhost_scsi struct se_portal_group with |
057cbf49 NB |
1764 | * the SCSI Initiator port name of the passed configfs group 'name'. |
1765 | */ | |
65ea7898 NB |
1766 | tv_nexus->tvn_se_sess = target_alloc_session(&tpg->se_tpg, |
1767 | VHOST_SCSI_DEFAULT_TAGS, | |
1768 | sizeof(struct vhost_scsi_cmd), | |
1769 | TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS, | |
1770 | (unsigned char *)name, tv_nexus, | |
1771 | vhost_scsi_nexus_cb); | |
1772 | if (IS_ERR(tv_nexus->tvn_se_sess)) { | |
98718312 | 1773 | mutex_unlock(&tpg->tv_tpg_mutex); |
65ea7898 NB |
1774 | kfree(tv_nexus); |
1775 | return -ENOMEM; | |
057cbf49 | 1776 | } |
98718312 | 1777 | tpg->tpg_nexus = tv_nexus; |
057cbf49 | 1778 | |
98718312 | 1779 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1780 | return 0; |
1781 | } | |
1782 | ||
1a1ff825 | 1783 | static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg) |
057cbf49 NB |
1784 | { |
1785 | struct se_session *se_sess; | |
1a1ff825 | 1786 | struct vhost_scsi_nexus *tv_nexus; |
057cbf49 NB |
1787 | |
1788 | mutex_lock(&tpg->tv_tpg_mutex); | |
1789 | tv_nexus = tpg->tpg_nexus; | |
1790 | if (!tv_nexus) { | |
1791 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1792 | return -ENODEV; | |
1793 | } | |
1794 | ||
1795 | se_sess = tv_nexus->tvn_se_sess; | |
1796 | if (!se_sess) { | |
1797 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1798 | return -ENODEV; | |
1799 | } | |
1800 | ||
101998f6 | 1801 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 1802 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1803 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1804 | " active TPG port count: %d\n", |
101998f6 NB |
1805 | tpg->tv_tpg_port_count); |
1806 | return -EBUSY; | |
057cbf49 NB |
1807 | } |
1808 | ||
101998f6 | 1809 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 1810 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1811 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1812 | " active TPG vhost count: %d\n", |
101998f6 NB |
1813 | tpg->tv_tpg_vhost_count); |
1814 | return -EBUSY; | |
057cbf49 NB |
1815 | } |
1816 | ||
101998f6 | 1817 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
1a1ff825 | 1818 | " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport), |
057cbf49 | 1819 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
3aee26b4 | 1820 | |
65ea7898 | 1821 | vhost_scsi_free_cmd_map_res(se_sess); |
057cbf49 | 1822 | /* |
101998f6 | 1823 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 NB |
1824 | */ |
1825 | transport_deregister_session(tv_nexus->tvn_se_sess); | |
1826 | tpg->tpg_nexus = NULL; | |
1827 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1828 | ||
1829 | kfree(tv_nexus); | |
1830 | return 0; | |
1831 | } | |
1832 | ||
2eafd729 | 1833 | static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page) |
057cbf49 | 1834 | { |
2eafd729 | 1835 | struct se_portal_group *se_tpg = to_tpg(item); |
1a1ff825 NB |
1836 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1837 | struct vhost_scsi_tpg, se_tpg); | |
1838 | struct vhost_scsi_nexus *tv_nexus; | |
057cbf49 NB |
1839 | ssize_t ret; |
1840 | ||
98718312 AH |
1841 | mutex_lock(&tpg->tv_tpg_mutex); |
1842 | tv_nexus = tpg->tpg_nexus; | |
057cbf49 | 1843 | if (!tv_nexus) { |
98718312 | 1844 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1845 | return -ENODEV; |
1846 | } | |
1847 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1848 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
98718312 | 1849 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1850 | |
1851 | return ret; | |
1852 | } | |
1853 | ||
2eafd729 CH |
1854 | static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item, |
1855 | const char *page, size_t count) | |
057cbf49 | 1856 | { |
2eafd729 | 1857 | struct se_portal_group *se_tpg = to_tpg(item); |
1a1ff825 NB |
1858 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1859 | struct vhost_scsi_tpg, se_tpg); | |
1860 | struct vhost_scsi_tport *tport_wwn = tpg->tport; | |
1861 | unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr; | |
057cbf49 NB |
1862 | int ret; |
1863 | /* | |
1864 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
1865 | */ | |
1866 | if (!strncmp(page, "NULL", 4)) { | |
1a1ff825 | 1867 | ret = vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
1868 | return (!ret) ? count : ret; |
1869 | } | |
1870 | /* | |
1871 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1a1ff825 NB |
1872 | * the fabric protocol_id set in vhost_scsi_make_tport(), and call |
1873 | * vhost_scsi_make_nexus(). | |
057cbf49 | 1874 | */ |
1a1ff825 | 1875 | if (strlen(page) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 1876 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
1a1ff825 | 1877 | " max: %d\n", page, VHOST_SCSI_NAMELEN); |
057cbf49 NB |
1878 | return -EINVAL; |
1879 | } | |
1a1ff825 | 1880 | snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page); |
057cbf49 NB |
1881 | |
1882 | ptr = strstr(i_port, "naa."); | |
1883 | if (ptr) { | |
1884 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
1885 | pr_err("Passed SAS Initiator Port %s does not" | |
1886 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 1887 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
1888 | return -EINVAL; |
1889 | } | |
1890 | port_ptr = &i_port[0]; | |
1891 | goto check_newline; | |
1892 | } | |
1893 | ptr = strstr(i_port, "fc."); | |
1894 | if (ptr) { | |
1895 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
1896 | pr_err("Passed FCP Initiator Port %s does not" | |
1897 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 1898 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
1899 | return -EINVAL; |
1900 | } | |
1901 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1902 | goto check_newline; | |
1903 | } | |
1904 | ptr = strstr(i_port, "iqn."); | |
1905 | if (ptr) { | |
1906 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
1907 | pr_err("Passed iSCSI Initiator Port %s does not" | |
1908 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 1909 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
1910 | return -EINVAL; |
1911 | } | |
1912 | port_ptr = &i_port[0]; | |
1913 | goto check_newline; | |
1914 | } | |
1915 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
1916 | " %s\n", i_port); | |
1917 | return -EINVAL; | |
1918 | /* | |
1919 | * Clear any trailing newline for the NAA WWN | |
1920 | */ | |
1921 | check_newline: | |
1922 | if (i_port[strlen(i_port)-1] == '\n') | |
1923 | i_port[strlen(i_port)-1] = '\0'; | |
1924 | ||
1a1ff825 | 1925 | ret = vhost_scsi_make_nexus(tpg, port_ptr); |
057cbf49 NB |
1926 | if (ret < 0) |
1927 | return ret; | |
1928 | ||
1929 | return count; | |
1930 | } | |
1931 | ||
2eafd729 | 1932 | CONFIGFS_ATTR(vhost_scsi_tpg_, nexus); |
057cbf49 | 1933 | |
1a1ff825 | 1934 | static struct configfs_attribute *vhost_scsi_tpg_attrs[] = { |
2eafd729 | 1935 | &vhost_scsi_tpg_attr_nexus, |
057cbf49 NB |
1936 | NULL, |
1937 | }; | |
1938 | ||
683bd967 | 1939 | static struct se_portal_group * |
1a1ff825 | 1940 | vhost_scsi_make_tpg(struct se_wwn *wwn, |
683bd967 AH |
1941 | struct config_group *group, |
1942 | const char *name) | |
057cbf49 | 1943 | { |
1a1ff825 NB |
1944 | struct vhost_scsi_tport *tport = container_of(wwn, |
1945 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 | 1946 | |
1a1ff825 | 1947 | struct vhost_scsi_tpg *tpg; |
59c816c1 | 1948 | u16 tpgt; |
057cbf49 NB |
1949 | int ret; |
1950 | ||
1951 | if (strstr(name, "tpgt_") != name) | |
1952 | return ERR_PTR(-EINVAL); | |
59c816c1 | 1953 | if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET) |
057cbf49 NB |
1954 | return ERR_PTR(-EINVAL); |
1955 | ||
1a1ff825 | 1956 | tpg = kzalloc(sizeof(struct vhost_scsi_tpg), GFP_KERNEL); |
057cbf49 | 1957 | if (!tpg) { |
1a1ff825 | 1958 | pr_err("Unable to allocate struct vhost_scsi_tpg"); |
057cbf49 NB |
1959 | return ERR_PTR(-ENOMEM); |
1960 | } | |
1961 | mutex_init(&tpg->tv_tpg_mutex); | |
1962 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
1963 | tpg->tport = tport; | |
1964 | tpg->tport_tpgt = tpgt; | |
1965 | ||
bc0c94b1 | 1966 | ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id); |
057cbf49 NB |
1967 | if (ret < 0) { |
1968 | kfree(tpg); | |
1969 | return NULL; | |
1970 | } | |
1a1ff825 NB |
1971 | mutex_lock(&vhost_scsi_mutex); |
1972 | list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list); | |
1973 | mutex_unlock(&vhost_scsi_mutex); | |
057cbf49 NB |
1974 | |
1975 | return &tpg->se_tpg; | |
1976 | } | |
1977 | ||
1a1ff825 | 1978 | static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg) |
057cbf49 | 1979 | { |
1a1ff825 NB |
1980 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1981 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1982 | |
1a1ff825 | 1983 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 1984 | list_del(&tpg->tv_tpg_list); |
1a1ff825 | 1985 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 1986 | /* |
101998f6 | 1987 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 | 1988 | */ |
1a1ff825 | 1989 | vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
1990 | /* |
1991 | * Deregister the se_tpg from TCM.. | |
1992 | */ | |
1993 | core_tpg_deregister(se_tpg); | |
1994 | kfree(tpg); | |
1995 | } | |
1996 | ||
683bd967 | 1997 | static struct se_wwn * |
1a1ff825 | 1998 | vhost_scsi_make_tport(struct target_fabric_configfs *tf, |
683bd967 AH |
1999 | struct config_group *group, |
2000 | const char *name) | |
057cbf49 | 2001 | { |
1a1ff825 | 2002 | struct vhost_scsi_tport *tport; |
057cbf49 NB |
2003 | char *ptr; |
2004 | u64 wwpn = 0; | |
2005 | int off = 0; | |
2006 | ||
1a1ff825 | 2007 | /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0) |
057cbf49 NB |
2008 | return ERR_PTR(-EINVAL); */ |
2009 | ||
1a1ff825 | 2010 | tport = kzalloc(sizeof(struct vhost_scsi_tport), GFP_KERNEL); |
057cbf49 | 2011 | if (!tport) { |
1a1ff825 | 2012 | pr_err("Unable to allocate struct vhost_scsi_tport"); |
057cbf49 NB |
2013 | return ERR_PTR(-ENOMEM); |
2014 | } | |
2015 | tport->tport_wwpn = wwpn; | |
2016 | /* | |
2017 | * Determine the emulated Protocol Identifier and Target Port Name | |
2018 | * based on the incoming configfs directory name. | |
2019 | */ | |
2020 | ptr = strstr(name, "naa."); | |
2021 | if (ptr) { | |
2022 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
2023 | goto check_len; | |
2024 | } | |
2025 | ptr = strstr(name, "fc."); | |
2026 | if (ptr) { | |
2027 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
2028 | off = 3; /* Skip over "fc." */ | |
2029 | goto check_len; | |
2030 | } | |
2031 | ptr = strstr(name, "iqn."); | |
2032 | if (ptr) { | |
2033 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
2034 | goto check_len; | |
2035 | } | |
2036 | ||
2037 | pr_err("Unable to locate prefix for emulated Target Port:" | |
2038 | " %s\n", name); | |
2039 | kfree(tport); | |
2040 | return ERR_PTR(-EINVAL); | |
2041 | ||
2042 | check_len: | |
1a1ff825 | 2043 | if (strlen(name) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2044 | pr_err("Emulated %s Address: %s, exceeds" |
1a1ff825 NB |
2045 | " max: %d\n", name, vhost_scsi_dump_proto_id(tport), |
2046 | VHOST_SCSI_NAMELEN); | |
057cbf49 NB |
2047 | kfree(tport); |
2048 | return ERR_PTR(-EINVAL); | |
2049 | } | |
1a1ff825 | 2050 | snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]); |
057cbf49 NB |
2051 | |
2052 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
1a1ff825 | 2053 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name); |
057cbf49 NB |
2054 | |
2055 | return &tport->tport_wwn; | |
2056 | } | |
2057 | ||
1a1ff825 | 2058 | static void vhost_scsi_drop_tport(struct se_wwn *wwn) |
057cbf49 | 2059 | { |
1a1ff825 NB |
2060 | struct vhost_scsi_tport *tport = container_of(wwn, |
2061 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 NB |
2062 | |
2063 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
1a1ff825 | 2064 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), |
057cbf49 NB |
2065 | tport->tport_name); |
2066 | ||
2067 | kfree(tport); | |
2068 | } | |
2069 | ||
683bd967 | 2070 | static ssize_t |
2eafd729 | 2071 | vhost_scsi_wwn_version_show(struct config_item *item, char *page) |
057cbf49 NB |
2072 | { |
2073 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" | |
1a1ff825 | 2074 | "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 NB |
2075 | utsname()->machine); |
2076 | } | |
2077 | ||
2eafd729 | 2078 | CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version); |
057cbf49 | 2079 | |
1a1ff825 | 2080 | static struct configfs_attribute *vhost_scsi_wwn_attrs[] = { |
2eafd729 | 2081 | &vhost_scsi_wwn_attr_version, |
057cbf49 NB |
2082 | NULL, |
2083 | }; | |
2084 | ||
1d822a40 | 2085 | static const struct target_core_fabric_ops vhost_scsi_ops = { |
9ac8928e CH |
2086 | .module = THIS_MODULE, |
2087 | .name = "vhost", | |
1a1ff825 | 2088 | .get_fabric_name = vhost_scsi_get_fabric_name, |
1a1ff825 NB |
2089 | .tpg_get_wwn = vhost_scsi_get_fabric_wwn, |
2090 | .tpg_get_tag = vhost_scsi_get_tpgt, | |
1a1ff825 NB |
2091 | .tpg_check_demo_mode = vhost_scsi_check_true, |
2092 | .tpg_check_demo_mode_cache = vhost_scsi_check_true, | |
2093 | .tpg_check_demo_mode_write_protect = vhost_scsi_check_false, | |
2094 | .tpg_check_prod_mode_write_protect = vhost_scsi_check_false, | |
b1d75fe5 | 2095 | .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only, |
1a1ff825 NB |
2096 | .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index, |
2097 | .release_cmd = vhost_scsi_release_cmd, | |
084ed45b | 2098 | .check_stop_free = vhost_scsi_check_stop_free, |
1a1ff825 | 2099 | .sess_get_index = vhost_scsi_sess_get_index, |
057cbf49 | 2100 | .sess_get_initiator_sid = NULL, |
1a1ff825 NB |
2101 | .write_pending = vhost_scsi_write_pending, |
2102 | .write_pending_status = vhost_scsi_write_pending_status, | |
2103 | .set_default_node_attributes = vhost_scsi_set_default_node_attrs, | |
1a1ff825 NB |
2104 | .get_cmd_state = vhost_scsi_get_cmd_state, |
2105 | .queue_data_in = vhost_scsi_queue_data_in, | |
2106 | .queue_status = vhost_scsi_queue_status, | |
2107 | .queue_tm_rsp = vhost_scsi_queue_tm_rsp, | |
2108 | .aborted_task = vhost_scsi_aborted_task, | |
057cbf49 NB |
2109 | /* |
2110 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
2111 | */ | |
1a1ff825 NB |
2112 | .fabric_make_wwn = vhost_scsi_make_tport, |
2113 | .fabric_drop_wwn = vhost_scsi_drop_tport, | |
2114 | .fabric_make_tpg = vhost_scsi_make_tpg, | |
2115 | .fabric_drop_tpg = vhost_scsi_drop_tpg, | |
2116 | .fabric_post_link = vhost_scsi_port_link, | |
2117 | .fabric_pre_unlink = vhost_scsi_port_unlink, | |
9ac8928e CH |
2118 | |
2119 | .tfc_wwn_attrs = vhost_scsi_wwn_attrs, | |
2120 | .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs, | |
2121 | .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs, | |
057cbf49 NB |
2122 | }; |
2123 | ||
9ac8928e | 2124 | static int __init vhost_scsi_init(void) |
057cbf49 | 2125 | { |
9ac8928e | 2126 | int ret = -ENOMEM; |
057cbf49 | 2127 | |
9ac8928e | 2128 | pr_debug("TCM_VHOST fabric module %s on %s/%s" |
1a1ff825 | 2129 | " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 | 2130 | utsname()->machine); |
057cbf49 | 2131 | |
101998f6 NB |
2132 | /* |
2133 | * Use our own dedicated workqueue for submitting I/O into | |
2134 | * target core to avoid contention within system_wq. | |
2135 | */ | |
1a1ff825 NB |
2136 | vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0); |
2137 | if (!vhost_scsi_workqueue) | |
057cbf49 NB |
2138 | goto out; |
2139 | ||
2140 | ret = vhost_scsi_register(); | |
2141 | if (ret < 0) | |
2142 | goto out_destroy_workqueue; | |
2143 | ||
9ac8928e | 2144 | ret = target_register_template(&vhost_scsi_ops); |
057cbf49 NB |
2145 | if (ret < 0) |
2146 | goto out_vhost_scsi_deregister; | |
2147 | ||
2148 | return 0; | |
2149 | ||
2150 | out_vhost_scsi_deregister: | |
2151 | vhost_scsi_deregister(); | |
2152 | out_destroy_workqueue: | |
1a1ff825 | 2153 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2154 | out: |
2155 | return ret; | |
2156 | }; | |
2157 | ||
1a1ff825 | 2158 | static void vhost_scsi_exit(void) |
057cbf49 | 2159 | { |
9ac8928e | 2160 | target_unregister_template(&vhost_scsi_ops); |
057cbf49 | 2161 | vhost_scsi_deregister(); |
1a1ff825 | 2162 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2163 | }; |
2164 | ||
181c04a3 MT |
2165 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
2166 | MODULE_ALIAS("tcm_vhost"); | |
057cbf49 | 2167 | MODULE_LICENSE("GPL"); |
1a1ff825 NB |
2168 | module_init(vhost_scsi_init); |
2169 | module_exit(vhost_scsi_exit); |