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Commit | Line | Data |
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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 NB |
90 | /* Pointer to response header iovec */ |
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 int vhost_scsi_shutdown_session(struct se_session *se_sess) |
057cbf49 NB |
337 | { |
338 | return 0; | |
339 | } | |
340 | ||
1a1ff825 | 341 | static void vhost_scsi_close_session(struct se_session *se_sess) |
057cbf49 NB |
342 | { |
343 | return; | |
344 | } | |
345 | ||
1a1ff825 | 346 | static u32 vhost_scsi_sess_get_index(struct se_session *se_sess) |
057cbf49 NB |
347 | { |
348 | return 0; | |
349 | } | |
350 | ||
1a1ff825 | 351 | static int vhost_scsi_write_pending(struct se_cmd *se_cmd) |
057cbf49 NB |
352 | { |
353 | /* Go ahead and process the write immediately */ | |
354 | target_execute_cmd(se_cmd); | |
355 | return 0; | |
356 | } | |
357 | ||
1a1ff825 | 358 | static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd) |
057cbf49 NB |
359 | { |
360 | return 0; | |
361 | } | |
362 | ||
1a1ff825 | 363 | static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl) |
057cbf49 NB |
364 | { |
365 | return; | |
366 | } | |
367 | ||
1a1ff825 | 368 | static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd) |
057cbf49 NB |
369 | { |
370 | return 0; | |
371 | } | |
372 | ||
1a1ff825 | 373 | static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd) |
101998f6 | 374 | { |
3c63f66a | 375 | struct vhost_scsi *vs = cmd->tvc_vhost; |
101998f6 | 376 | |
3c63f66a | 377 | llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
101998f6 NB |
378 | |
379 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
380 | } | |
057cbf49 | 381 | |
1a1ff825 | 382 | static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd) |
057cbf49 | 383 | { |
1a1ff825 NB |
384 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
385 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 386 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
387 | return 0; |
388 | } | |
389 | ||
1a1ff825 | 390 | static int vhost_scsi_queue_status(struct se_cmd *se_cmd) |
057cbf49 | 391 | { |
1a1ff825 NB |
392 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
393 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 394 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
395 | return 0; |
396 | } | |
397 | ||
1a1ff825 | 398 | static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd) |
057cbf49 | 399 | { |
b79fafac | 400 | return; |
057cbf49 NB |
401 | } |
402 | ||
1a1ff825 | 403 | static void vhost_scsi_aborted_task(struct se_cmd *se_cmd) |
131e6abc NB |
404 | { |
405 | return; | |
406 | } | |
407 | ||
1a1ff825 | 408 | static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 AH |
409 | { |
410 | vs->vs_events_nr--; | |
411 | kfree(evt); | |
412 | } | |
413 | ||
1a1ff825 NB |
414 | static struct vhost_scsi_evt * |
415 | vhost_scsi_allocate_evt(struct vhost_scsi *vs, | |
683bd967 | 416 | u32 event, u32 reason) |
a6c9af87 | 417 | { |
3ab2e420 | 418 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
1a1ff825 | 419 | struct vhost_scsi_evt *evt; |
a6c9af87 AH |
420 | |
421 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
422 | vs->vs_events_missed = true; | |
423 | return NULL; | |
424 | } | |
425 | ||
426 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
427 | if (!evt) { | |
1a1ff825 | 428 | vq_err(vq, "Failed to allocate vhost_scsi_evt\n"); |
a6c9af87 AH |
429 | vs->vs_events_missed = true; |
430 | return NULL; | |
431 | } | |
432 | ||
e72fd72e MT |
433 | evt->event.event = cpu_to_vhost32(vq, event); |
434 | evt->event.reason = cpu_to_vhost32(vq, reason); | |
a6c9af87 AH |
435 | vs->vs_events_nr++; |
436 | ||
437 | return evt; | |
438 | } | |
439 | ||
1a1ff825 | 440 | static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd) |
057cbf49 | 441 | { |
3c63f66a | 442 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
443 | |
444 | /* TODO locking against target/backend threads? */ | |
6c131d0c | 445 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 446 | |
084ed45b | 447 | } |
f2f0173d | 448 | |
084ed45b NB |
449 | static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) |
450 | { | |
afc16604 | 451 | return target_put_sess_cmd(se_cmd); |
057cbf49 NB |
452 | } |
453 | ||
683bd967 | 454 | static void |
1a1ff825 | 455 | vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 | 456 | { |
3ab2e420 | 457 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
458 | struct virtio_scsi_event *event = &evt->event; |
459 | struct virtio_scsi_event __user *eventp; | |
460 | unsigned out, in; | |
461 | int head, ret; | |
462 | ||
463 | if (!vq->private_data) { | |
464 | vs->vs_events_missed = true; | |
465 | return; | |
466 | } | |
467 | ||
468 | again: | |
469 | vhost_disable_notify(&vs->dev, vq); | |
47283bef | 470 | head = vhost_get_vq_desc(vq, vq->iov, |
a6c9af87 AH |
471 | ARRAY_SIZE(vq->iov), &out, &in, |
472 | NULL, NULL); | |
473 | if (head < 0) { | |
474 | vs->vs_events_missed = true; | |
475 | return; | |
476 | } | |
477 | if (head == vq->num) { | |
478 | if (vhost_enable_notify(&vs->dev, vq)) | |
479 | goto again; | |
480 | vs->vs_events_missed = true; | |
481 | return; | |
482 | } | |
483 | ||
484 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { | |
485 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", | |
486 | vq->iov[out].iov_len); | |
487 | vs->vs_events_missed = true; | |
488 | return; | |
489 | } | |
490 | ||
491 | if (vs->vs_events_missed) { | |
e72fd72e | 492 | event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED); |
a6c9af87 AH |
493 | vs->vs_events_missed = false; |
494 | } | |
495 | ||
496 | eventp = vq->iov[out].iov_base; | |
497 | ret = __copy_to_user(eventp, event, sizeof(*event)); | |
498 | if (!ret) | |
499 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
500 | else | |
1a1ff825 | 501 | vq_err(vq, "Faulted on vhost_scsi_send_event\n"); |
a6c9af87 AH |
502 | } |
503 | ||
1a1ff825 | 504 | static void vhost_scsi_evt_work(struct vhost_work *work) |
a6c9af87 AH |
505 | { |
506 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
507 | vs_event_work); | |
3ab2e420 | 508 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
1a1ff825 | 509 | struct vhost_scsi_evt *evt; |
a6c9af87 AH |
510 | struct llist_node *llnode; |
511 | ||
512 | mutex_lock(&vq->mutex); | |
513 | llnode = llist_del_all(&vs->vs_event_list); | |
514 | while (llnode) { | |
1a1ff825 | 515 | evt = llist_entry(llnode, struct vhost_scsi_evt, list); |
a6c9af87 | 516 | llnode = llist_next(llnode); |
1a1ff825 NB |
517 | vhost_scsi_do_evt_work(vs, evt); |
518 | vhost_scsi_free_evt(vs, evt); | |
a6c9af87 AH |
519 | } |
520 | mutex_unlock(&vq->mutex); | |
521 | } | |
522 | ||
057cbf49 NB |
523 | /* Fill in status and signal that we are done processing this command |
524 | * | |
525 | * This is scheduled in the vhost work queue so we are called with the owner | |
526 | * process mm and can access the vring. | |
527 | */ | |
528 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) | |
529 | { | |
530 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
531 | vs_completion_work); | |
1b7f390e | 532 | DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 533 | struct virtio_scsi_cmd_resp v_rsp; |
1a1ff825 | 534 | struct vhost_scsi_cmd *cmd; |
9d6064a3 AH |
535 | struct llist_node *llnode; |
536 | struct se_cmd *se_cmd; | |
79c14141 | 537 | struct iov_iter iov_iter; |
1b7f390e | 538 | int ret, vq; |
057cbf49 | 539 | |
1b7f390e | 540 | bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 AH |
541 | llnode = llist_del_all(&vs->vs_completion_list); |
542 | while (llnode) { | |
1a1ff825 | 543 | cmd = llist_entry(llnode, struct vhost_scsi_cmd, |
9d6064a3 AH |
544 | tvc_completion_list); |
545 | llnode = llist_next(llnode); | |
3c63f66a | 546 | se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
547 | |
548 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
3c63f66a | 549 | cmd, se_cmd->residual_count, se_cmd->scsi_status); |
057cbf49 NB |
550 | |
551 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
e72fd72e | 552 | v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count); |
057cbf49 NB |
553 | /* TODO is status_qualifier field needed? */ |
554 | v_rsp.status = se_cmd->scsi_status; | |
e72fd72e MT |
555 | v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq, |
556 | se_cmd->scsi_sense_length); | |
3c63f66a | 557 | memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
e72fd72e | 558 | se_cmd->scsi_sense_length); |
79c14141 NB |
559 | |
560 | iov_iter_init(&iov_iter, READ, cmd->tvc_resp_iov, | |
561 | cmd->tvc_in_iovs, sizeof(v_rsp)); | |
562 | ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter); | |
563 | if (likely(ret == sizeof(v_rsp))) { | |
3ab2e420 | 564 | struct vhost_scsi_virtqueue *q; |
3c63f66a AH |
565 | vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
566 | q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); | |
3ab2e420 | 567 | vq = q - vs->vqs; |
1b7f390e AH |
568 | __set_bit(vq, signal); |
569 | } else | |
057cbf49 NB |
570 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
571 | ||
3c63f66a | 572 | vhost_scsi_free_cmd(cmd); |
057cbf49 NB |
573 | } |
574 | ||
1b7f390e AH |
575 | vq = -1; |
576 | while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) | |
577 | < VHOST_SCSI_MAX_VQ) | |
3ab2e420 | 578 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
579 | } |
580 | ||
1a1ff825 NB |
581 | static struct vhost_scsi_cmd * |
582 | vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg, | |
95e7c434 NB |
583 | unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr, |
584 | u32 exp_data_len, int data_direction) | |
057cbf49 | 585 | { |
1a1ff825 NB |
586 | struct vhost_scsi_cmd *cmd; |
587 | struct vhost_scsi_nexus *tv_nexus; | |
4824d3bf | 588 | struct se_session *se_sess; |
b1935f68 | 589 | struct scatterlist *sg, *prot_sg; |
3aee26b4 | 590 | struct page **pages; |
4824d3bf | 591 | int tag; |
057cbf49 | 592 | |
98718312 | 593 | tv_nexus = tpg->tpg_nexus; |
057cbf49 | 594 | if (!tv_nexus) { |
1a1ff825 | 595 | pr_err("Unable to locate active struct vhost_scsi_nexus\n"); |
057cbf49 NB |
596 | return ERR_PTR(-EIO); |
597 | } | |
4824d3bf | 598 | se_sess = tv_nexus->tvn_se_sess; |
057cbf49 | 599 | |
6f6b5d1e | 600 | tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING); |
4a47d3a1 | 601 | if (tag < 0) { |
1a1ff825 | 602 | pr_err("Unable to obtain tag for vhost_scsi_cmd\n"); |
4a47d3a1 NB |
603 | return ERR_PTR(-ENOMEM); |
604 | } | |
605 | ||
1a1ff825 | 606 | cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag]; |
3aee26b4 | 607 | sg = cmd->tvc_sgl; |
b1935f68 | 608 | prot_sg = cmd->tvc_prot_sgl; |
3aee26b4 | 609 | pages = cmd->tvc_upages; |
1a1ff825 | 610 | memset(cmd, 0, sizeof(struct vhost_scsi_cmd)); |
4824d3bf | 611 | |
3aee26b4 | 612 | cmd->tvc_sgl = sg; |
b1935f68 | 613 | cmd->tvc_prot_sgl = prot_sg; |
3aee26b4 | 614 | cmd->tvc_upages = pages; |
4824d3bf | 615 | cmd->tvc_se_cmd.map_tag = tag; |
95e7c434 NB |
616 | cmd->tvc_tag = scsi_tag; |
617 | cmd->tvc_lun = lun; | |
618 | cmd->tvc_task_attr = task_attr; | |
3c63f66a AH |
619 | cmd->tvc_exp_data_len = exp_data_len; |
620 | cmd->tvc_data_direction = data_direction; | |
621 | cmd->tvc_nexus = tv_nexus; | |
1a1ff825 | 622 | cmd->inflight = vhost_scsi_get_inflight(vq); |
3c63f66a | 623 | |
1a1ff825 | 624 | memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE); |
95e7c434 | 625 | |
3c63f66a | 626 | return cmd; |
057cbf49 NB |
627 | } |
628 | ||
629 | /* | |
630 | * Map a user memory range into a scatterlist | |
631 | * | |
632 | * Returns the number of scatterlist entries used or -errno on error. | |
633 | */ | |
683bd967 | 634 | static int |
1a1ff825 | 635 | vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd, |
b4078b5f NB |
636 | void __user *ptr, |
637 | size_t len, | |
3aee26b4 | 638 | struct scatterlist *sgl, |
5a01d082 | 639 | bool write) |
057cbf49 | 640 | { |
b4078b5f NB |
641 | unsigned int npages = 0, offset, nbytes; |
642 | unsigned int pages_nr = iov_num_pages(ptr, len); | |
057cbf49 | 643 | struct scatterlist *sg = sgl; |
b4078b5f | 644 | struct page **pages = cmd->tvc_upages; |
1810053e | 645 | int ret, i; |
057cbf49 | 646 | |
1a1ff825 | 647 | if (pages_nr > VHOST_SCSI_PREALLOC_UPAGES) { |
3aee26b4 | 648 | pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than" |
1a1ff825 NB |
649 | " preallocated VHOST_SCSI_PREALLOC_UPAGES: %u\n", |
650 | pages_nr, VHOST_SCSI_PREALLOC_UPAGES); | |
3aee26b4 NB |
651 | return -ENOBUFS; |
652 | } | |
653 | ||
1810053e AH |
654 | ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages); |
655 | /* No pages were pinned */ | |
656 | if (ret < 0) | |
657 | goto out; | |
658 | /* Less pages pinned than wanted */ | |
659 | if (ret != pages_nr) { | |
660 | for (i = 0; i < ret; i++) | |
661 | put_page(pages[i]); | |
662 | ret = -EFAULT; | |
663 | goto out; | |
664 | } | |
665 | ||
666 | while (len > 0) { | |
667 | offset = (uintptr_t)ptr & ~PAGE_MASK; | |
668 | nbytes = min_t(unsigned int, PAGE_SIZE - offset, len); | |
669 | sg_set_page(sg, pages[npages], nbytes, offset); | |
057cbf49 NB |
670 | ptr += nbytes; |
671 | len -= nbytes; | |
672 | sg++; | |
673 | npages++; | |
674 | } | |
057cbf49 | 675 | |
1810053e | 676 | out: |
057cbf49 NB |
677 | return ret; |
678 | } | |
679 | ||
683bd967 | 680 | static int |
e8de56b5 | 681 | vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls) |
057cbf49 | 682 | { |
e8de56b5 | 683 | int sgl_count = 0; |
057cbf49 | 684 | |
e8de56b5 NB |
685 | if (!iter || !iter->iov) { |
686 | pr_err("%s: iter->iov is NULL, but expected bytes: %zu" | |
687 | " present\n", __func__, bytes); | |
688 | return -EINVAL; | |
689 | } | |
f3158f36 | 690 | |
e8de56b5 NB |
691 | sgl_count = iov_iter_npages(iter, 0xffff); |
692 | if (sgl_count > max_sgls) { | |
693 | pr_err("%s: requested sgl_count: %d exceeds pre-allocated" | |
694 | " max_sgls: %d\n", __func__, sgl_count, max_sgls); | |
695 | return -EINVAL; | |
5a01d082 | 696 | } |
e8de56b5 NB |
697 | return sgl_count; |
698 | } | |
057cbf49 | 699 | |
e8de56b5 | 700 | static int |
1a1ff825 NB |
701 | vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write, |
702 | struct iov_iter *iter, | |
703 | struct scatterlist *sg, int sg_count) | |
e8de56b5 NB |
704 | { |
705 | size_t off = iter->iov_offset; | |
706 | int i, ret; | |
057cbf49 | 707 | |
e8de56b5 NB |
708 | for (i = 0; i < iter->nr_segs; i++) { |
709 | void __user *base = iter->iov[i].iov_base + off; | |
710 | size_t len = iter->iov[i].iov_len - off; | |
5a01d082 | 711 | |
e8de56b5 | 712 | ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write); |
057cbf49 | 713 | if (ret < 0) { |
e8de56b5 NB |
714 | for (i = 0; i < sg_count; i++) { |
715 | struct page *page = sg_page(&sg[i]); | |
716 | if (page) | |
717 | put_page(page); | |
718 | } | |
057cbf49 NB |
719 | return ret; |
720 | } | |
057cbf49 | 721 | sg += ret; |
e8de56b5 | 722 | off = 0; |
057cbf49 NB |
723 | } |
724 | return 0; | |
725 | } | |
726 | ||
e31885dd | 727 | static int |
1a1ff825 | 728 | vhost_scsi_mapal(struct vhost_scsi_cmd *cmd, |
e8de56b5 NB |
729 | size_t prot_bytes, struct iov_iter *prot_iter, |
730 | size_t data_bytes, struct iov_iter *data_iter) | |
731 | { | |
732 | int sgl_count, ret; | |
733 | bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE); | |
734 | ||
735 | if (prot_bytes) { | |
736 | sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes, | |
1a1ff825 | 737 | VHOST_SCSI_PREALLOC_PROT_SGLS); |
e8de56b5 NB |
738 | if (sgl_count < 0) |
739 | return sgl_count; | |
740 | ||
741 | sg_init_table(cmd->tvc_prot_sgl, sgl_count); | |
742 | cmd->tvc_prot_sgl_count = sgl_count; | |
743 | pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__, | |
744 | cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count); | |
745 | ||
746 | ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter, | |
747 | cmd->tvc_prot_sgl, | |
748 | cmd->tvc_prot_sgl_count); | |
e31885dd | 749 | if (ret < 0) { |
e31885dd NB |
750 | cmd->tvc_prot_sgl_count = 0; |
751 | return ret; | |
752 | } | |
e8de56b5 NB |
753 | } |
754 | sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes, | |
1a1ff825 | 755 | VHOST_SCSI_PREALLOC_SGLS); |
e8de56b5 NB |
756 | if (sgl_count < 0) |
757 | return sgl_count; | |
758 | ||
759 | sg_init_table(cmd->tvc_sgl, sgl_count); | |
760 | cmd->tvc_sgl_count = sgl_count; | |
761 | pr_debug("%s data_sg %p data_sgl_count %u\n", __func__, | |
762 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
763 | ||
764 | ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter, | |
765 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
766 | if (ret < 0) { | |
767 | cmd->tvc_sgl_count = 0; | |
768 | return ret; | |
e31885dd NB |
769 | } |
770 | return 0; | |
771 | } | |
772 | ||
46243860 NB |
773 | static int vhost_scsi_to_tcm_attr(int attr) |
774 | { | |
775 | switch (attr) { | |
776 | case VIRTIO_SCSI_S_SIMPLE: | |
777 | return TCM_SIMPLE_TAG; | |
778 | case VIRTIO_SCSI_S_ORDERED: | |
779 | return TCM_ORDERED_TAG; | |
780 | case VIRTIO_SCSI_S_HEAD: | |
781 | return TCM_HEAD_TAG; | |
782 | case VIRTIO_SCSI_S_ACA: | |
783 | return TCM_ACA_TAG; | |
784 | default: | |
785 | break; | |
786 | } | |
787 | return TCM_SIMPLE_TAG; | |
788 | } | |
789 | ||
1a1ff825 | 790 | static void vhost_scsi_submission_work(struct work_struct *work) |
057cbf49 | 791 | { |
1a1ff825 NB |
792 | struct vhost_scsi_cmd *cmd = |
793 | container_of(work, struct vhost_scsi_cmd, work); | |
794 | struct vhost_scsi_nexus *tv_nexus; | |
3c63f66a | 795 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
95e7c434 NB |
796 | struct scatterlist *sg_ptr, *sg_prot_ptr = NULL; |
797 | int rc; | |
057cbf49 | 798 | |
95e7c434 | 799 | /* FIXME: BIDI operation */ |
3c63f66a AH |
800 | if (cmd->tvc_sgl_count) { |
801 | sg_ptr = cmd->tvc_sgl; | |
95e7c434 NB |
802 | |
803 | if (cmd->tvc_prot_sgl_count) | |
804 | sg_prot_ptr = cmd->tvc_prot_sgl; | |
805 | else | |
806 | se_cmd->prot_pto = true; | |
057cbf49 NB |
807 | } else { |
808 | sg_ptr = NULL; | |
809 | } | |
3c63f66a | 810 | tv_nexus = cmd->tvc_nexus; |
9f0abc15 | 811 | |
649ee054 | 812 | se_cmd->tag = 0; |
9f0abc15 | 813 | rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, |
3c63f66a AH |
814 | cmd->tvc_cdb, &cmd->tvc_sense_buf[0], |
815 | cmd->tvc_lun, cmd->tvc_exp_data_len, | |
46243860 NB |
816 | vhost_scsi_to_tcm_attr(cmd->tvc_task_attr), |
817 | cmd->tvc_data_direction, TARGET_SCF_ACK_KREF, | |
818 | sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr, | |
819 | cmd->tvc_prot_sgl_count); | |
057cbf49 NB |
820 | if (rc < 0) { |
821 | transport_send_check_condition_and_sense(se_cmd, | |
9f0abc15 | 822 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
057cbf49 | 823 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 824 | } |
057cbf49 NB |
825 | } |
826 | ||
683bd967 AH |
827 | static void |
828 | vhost_scsi_send_bad_target(struct vhost_scsi *vs, | |
829 | struct vhost_virtqueue *vq, | |
830 | int head, unsigned out) | |
637ab21e AH |
831 | { |
832 | struct virtio_scsi_cmd_resp __user *resp; | |
833 | struct virtio_scsi_cmd_resp rsp; | |
834 | int ret; | |
835 | ||
836 | memset(&rsp, 0, sizeof(rsp)); | |
837 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
838 | resp = vq->iov[out].iov_base; | |
839 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
840 | if (!ret) | |
841 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
842 | else | |
843 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
844 | } | |
845 | ||
683bd967 AH |
846 | static void |
847 | vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
057cbf49 | 848 | { |
1a1ff825 | 849 | struct vhost_scsi_tpg **vs_tpg, *tpg; |
057cbf49 | 850 | struct virtio_scsi_cmd_req v_req; |
95e7c434 | 851 | struct virtio_scsi_cmd_req_pi v_req_pi; |
1a1ff825 | 852 | struct vhost_scsi_cmd *cmd; |
09b13fa8 | 853 | struct iov_iter out_iter, in_iter, prot_iter, data_iter; |
95e7c434 | 854 | u64 tag; |
09b13fa8 NB |
855 | u32 exp_data_len, data_direction; |
856 | unsigned out, in; | |
857 | int head, ret, prot_bytes; | |
858 | size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp); | |
859 | size_t out_size, in_size; | |
95e7c434 NB |
860 | u16 lun; |
861 | u8 *target, *lunp, task_attr; | |
09b13fa8 | 862 | bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI); |
95e7c434 | 863 | void *req, *cdb; |
057cbf49 | 864 | |
e7802212 | 865 | mutex_lock(&vq->mutex); |
4f7f46d3 AH |
866 | /* |
867 | * We can handle the vq only after the endpoint is setup by calling the | |
868 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
4f7f46d3 | 869 | */ |
e7802212 | 870 | vs_tpg = vq->private_data; |
4f7f46d3 | 871 | if (!vs_tpg) |
e7802212 | 872 | goto out; |
057cbf49 | 873 | |
057cbf49 NB |
874 | vhost_disable_notify(&vs->dev, vq); |
875 | ||
876 | for (;;) { | |
47283bef | 877 | head = vhost_get_vq_desc(vq, vq->iov, |
09b13fa8 NB |
878 | ARRAY_SIZE(vq->iov), &out, &in, |
879 | NULL, NULL); | |
057cbf49 | 880 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", |
09b13fa8 | 881 | head, out, in); |
057cbf49 NB |
882 | /* On error, stop handling until the next kick. */ |
883 | if (unlikely(head < 0)) | |
884 | break; | |
885 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
886 | if (head == vq->num) { | |
887 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
888 | vhost_disable_notify(&vs->dev, vq); | |
889 | continue; | |
890 | } | |
891 | break; | |
892 | } | |
057cbf49 | 893 | /* |
09b13fa8 NB |
894 | * Check for a sane response buffer so we can report early |
895 | * errors back to the guest. | |
057cbf49 | 896 | */ |
09b13fa8 NB |
897 | if (unlikely(vq->iov[out].iov_len < rsp_size)) { |
898 | vq_err(vq, "Expecting at least virtio_scsi_cmd_resp" | |
899 | " size, got %zu bytes\n", vq->iov[out].iov_len); | |
057cbf49 NB |
900 | break; |
901 | } | |
09b13fa8 NB |
902 | /* |
903 | * Setup pointers and values based upon different virtio-scsi | |
904 | * request header if T10_PI is enabled in KVM guest. | |
905 | */ | |
906 | if (t10_pi) { | |
95e7c434 | 907 | req = &v_req_pi; |
09b13fa8 | 908 | req_size = sizeof(v_req_pi); |
95e7c434 NB |
909 | lunp = &v_req_pi.lun[0]; |
910 | target = &v_req_pi.lun[1]; | |
95e7c434 NB |
911 | } else { |
912 | req = &v_req; | |
09b13fa8 | 913 | req_size = sizeof(v_req); |
95e7c434 NB |
914 | lunp = &v_req.lun[0]; |
915 | target = &v_req.lun[1]; | |
95e7c434 | 916 | } |
09b13fa8 NB |
917 | /* |
918 | * FIXME: Not correct for BIDI operation | |
919 | */ | |
920 | out_size = iov_length(vq->iov, out); | |
921 | in_size = iov_length(&vq->iov[out], in); | |
95e7c434 | 922 | |
09b13fa8 NB |
923 | /* |
924 | * Copy over the virtio-scsi request header, which for a | |
925 | * ANY_LAYOUT enabled guest may span multiple iovecs, or a | |
926 | * single iovec may contain both the header + outgoing | |
927 | * WRITE payloads. | |
928 | * | |
929 | * copy_from_iter() will advance out_iter, so that it will | |
930 | * point at the start of the outgoing WRITE payload, if | |
931 | * DMA_TO_DEVICE is set. | |
932 | */ | |
933 | iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size); | |
057cbf49 | 934 | |
09b13fa8 NB |
935 | ret = copy_from_iter(req, req_size, &out_iter); |
936 | if (unlikely(ret != req_size)) { | |
937 | vq_err(vq, "Faulted on copy_from_iter\n"); | |
de1419e4 NB |
938 | vhost_scsi_send_bad_target(vs, vq, head, out); |
939 | continue; | |
057cbf49 | 940 | } |
7fe412d0 | 941 | /* virtio-scsi spec requires byte 0 of the lun to be 1 */ |
95e7c434 | 942 | if (unlikely(*lunp != 1)) { |
09b13fa8 | 943 | vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp); |
7fe412d0 VS |
944 | vhost_scsi_send_bad_target(vs, vq, head, out); |
945 | continue; | |
946 | } | |
947 | ||
95e7c434 | 948 | tpg = ACCESS_ONCE(vs_tpg[*target]); |
98718312 | 949 | if (unlikely(!tpg)) { |
09b13fa8 | 950 | /* Target does not exist, fail the request */ |
637ab21e | 951 | vhost_scsi_send_bad_target(vs, vq, head, out); |
67e18cf9 AH |
952 | continue; |
953 | } | |
95e7c434 | 954 | /* |
09b13fa8 NB |
955 | * Determine data_direction by calculating the total outgoing |
956 | * iovec sizes + incoming iovec sizes vs. virtio-scsi request + | |
957 | * response headers respectively. | |
95e7c434 | 958 | * |
09b13fa8 NB |
959 | * For DMA_TO_DEVICE this is out_iter, which is already pointing |
960 | * to the right place. | |
961 | * | |
962 | * For DMA_FROM_DEVICE, the iovec will be just past the end | |
963 | * of the virtio-scsi response header in either the same | |
964 | * or immediately following iovec. | |
95e7c434 | 965 | * |
09b13fa8 NB |
966 | * Any associated T10_PI bytes for the outgoing / incoming |
967 | * payloads are included in calculation of exp_data_len here. | |
95e7c434 | 968 | */ |
09b13fa8 NB |
969 | prot_bytes = 0; |
970 | ||
971 | if (out_size > req_size) { | |
972 | data_direction = DMA_TO_DEVICE; | |
973 | exp_data_len = out_size - req_size; | |
974 | data_iter = out_iter; | |
975 | } else if (in_size > rsp_size) { | |
976 | data_direction = DMA_FROM_DEVICE; | |
977 | exp_data_len = in_size - rsp_size; | |
978 | ||
979 | iov_iter_init(&in_iter, READ, &vq->iov[out], in, | |
980 | rsp_size + exp_data_len); | |
981 | iov_iter_advance(&in_iter, rsp_size); | |
982 | data_iter = in_iter; | |
983 | } else { | |
984 | data_direction = DMA_NONE; | |
985 | exp_data_len = 0; | |
986 | } | |
987 | /* | |
988 | * If T10_PI header + payload is present, setup prot_iter values | |
989 | * and recalculate data_iter for vhost_scsi_mapal() mapping to | |
990 | * host scatterlists via get_user_pages_fast(). | |
95e7c434 | 991 | */ |
09b13fa8 | 992 | if (t10_pi) { |
95e7c434 NB |
993 | if (v_req_pi.pi_bytesout) { |
994 | if (data_direction != DMA_TO_DEVICE) { | |
09b13fa8 NB |
995 | vq_err(vq, "Received non zero pi_bytesout," |
996 | " but wrong data_direction\n"); | |
de1419e4 NB |
997 | vhost_scsi_send_bad_target(vs, vq, head, out); |
998 | continue; | |
95e7c434 | 999 | } |
e72fd72e | 1000 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout); |
95e7c434 NB |
1001 | } else if (v_req_pi.pi_bytesin) { |
1002 | if (data_direction != DMA_FROM_DEVICE) { | |
09b13fa8 NB |
1003 | vq_err(vq, "Received non zero pi_bytesin," |
1004 | " but wrong data_direction\n"); | |
de1419e4 NB |
1005 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1006 | continue; | |
95e7c434 | 1007 | } |
e72fd72e | 1008 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin); |
95e7c434 | 1009 | } |
09b13fa8 NB |
1010 | /* |
1011 | * Set prot_iter to data_iter, and advance past any | |
1012 | * preceeding prot_bytes that may be present. | |
1013 | * | |
1014 | * Also fix up the exp_data_len to reflect only the | |
1015 | * actual data payload length. | |
1016 | */ | |
95e7c434 | 1017 | if (prot_bytes) { |
09b13fa8 NB |
1018 | exp_data_len -= prot_bytes; |
1019 | prot_iter = data_iter; | |
1020 | iov_iter_advance(&data_iter, prot_bytes); | |
95e7c434 | 1021 | } |
e72fd72e | 1022 | tag = vhost64_to_cpu(vq, v_req_pi.tag); |
95e7c434 NB |
1023 | task_attr = v_req_pi.task_attr; |
1024 | cdb = &v_req_pi.cdb[0]; | |
1025 | lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF; | |
1026 | } else { | |
e72fd72e | 1027 | tag = vhost64_to_cpu(vq, v_req.tag); |
95e7c434 NB |
1028 | task_attr = v_req.task_attr; |
1029 | cdb = &v_req.cdb[0]; | |
1030 | lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; | |
1031 | } | |
95e7c434 | 1032 | /* |
09b13fa8 NB |
1033 | * Check that the received CDB size does not exceeded our |
1034 | * hardcoded max for vhost-scsi, then get a pre-allocated | |
1035 | * cmd descriptor for the new virtio-scsi tag. | |
95e7c434 NB |
1036 | * |
1037 | * TODO what if cdb was too small for varlen cdb header? | |
1038 | */ | |
1a1ff825 | 1039 | if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) { |
95e7c434 NB |
1040 | vq_err(vq, "Received SCSI CDB with command_size: %d that" |
1041 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
1a1ff825 | 1042 | scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE); |
de1419e4 NB |
1043 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1044 | continue; | |
95e7c434 | 1045 | } |
95e7c434 | 1046 | cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr, |
9f977ef7 NB |
1047 | exp_data_len + prot_bytes, |
1048 | data_direction); | |
3c63f66a | 1049 | if (IS_ERR(cmd)) { |
4824d3bf | 1050 | vq_err(vq, "vhost_scsi_get_tag failed %ld\n", |
09b13fa8 | 1051 | PTR_ERR(cmd)); |
de1419e4 NB |
1052 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1053 | continue; | |
057cbf49 | 1054 | } |
3c63f66a AH |
1055 | cmd->tvc_vhost = vs; |
1056 | cmd->tvc_vq = vq; | |
79c14141 NB |
1057 | cmd->tvc_resp_iov = &vq->iov[out]; |
1058 | cmd->tvc_in_iovs = in; | |
057cbf49 | 1059 | |
057cbf49 | 1060 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", |
09b13fa8 NB |
1061 | cmd->tvc_cdb[0], cmd->tvc_lun); |
1062 | pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:" | |
1063 | " %d\n", cmd, exp_data_len, prot_bytes, data_direction); | |
057cbf49 NB |
1064 | |
1065 | if (data_direction != DMA_NONE) { | |
09b13fa8 NB |
1066 | ret = vhost_scsi_mapal(cmd, |
1067 | prot_bytes, &prot_iter, | |
1068 | exp_data_len, &data_iter); | |
057cbf49 NB |
1069 | if (unlikely(ret)) { |
1070 | vq_err(vq, "Failed to map iov to sgl\n"); | |
1a1ff825 | 1071 | vhost_scsi_release_cmd(&cmd->tvc_se_cmd); |
de1419e4 NB |
1072 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1073 | continue; | |
057cbf49 NB |
1074 | } |
1075 | } | |
057cbf49 NB |
1076 | /* |
1077 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
1078 | * complete the virtio-scsi request in TCM callback context via | |
09b13fa8 | 1079 | * vhost_scsi_queue_data_in() and vhost_scsi_queue_status() |
057cbf49 | 1080 | */ |
3c63f66a | 1081 | cmd->tvc_vq_desc = head; |
057cbf49 | 1082 | /* |
09b13fa8 NB |
1083 | * Dispatch cmd descriptor for cmwq execution in process |
1084 | * context provided by vhost_scsi_workqueue. This also ensures | |
1085 | * cmd is executed on the same kworker CPU as this vhost | |
1086 | * thread to gain positive L2 cache locality effects. | |
057cbf49 | 1087 | */ |
1a1ff825 NB |
1088 | INIT_WORK(&cmd->work, vhost_scsi_submission_work); |
1089 | queue_work(vhost_scsi_workqueue, &cmd->work); | |
057cbf49 | 1090 | } |
e7802212 | 1091 | out: |
7ea206cf | 1092 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
1093 | } |
1094 | ||
1095 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) | |
1096 | { | |
101998f6 | 1097 | pr_debug("%s: The handling func for control queue.\n", __func__); |
057cbf49 NB |
1098 | } |
1099 | ||
683bd967 | 1100 | static void |
1a1ff825 NB |
1101 | vhost_scsi_send_evt(struct vhost_scsi *vs, |
1102 | struct vhost_scsi_tpg *tpg, | |
683bd967 AH |
1103 | struct se_lun *lun, |
1104 | u32 event, | |
1105 | u32 reason) | |
a6c9af87 | 1106 | { |
1a1ff825 | 1107 | struct vhost_scsi_evt *evt; |
a6c9af87 | 1108 | |
1a1ff825 | 1109 | evt = vhost_scsi_allocate_evt(vs, event, reason); |
a6c9af87 AH |
1110 | if (!evt) |
1111 | return; | |
1112 | ||
1113 | if (tpg && lun) { | |
1114 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
1115 | /* | |
1116 | * Note: evt->event is zeroed when we allocate it and | |
1117 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
1118 | */ | |
1119 | evt->event.lun[0] = 0x01; | |
59c816c1 | 1120 | evt->event.lun[1] = tpg->tport_tpgt; |
a6c9af87 AH |
1121 | if (lun->unpacked_lun >= 256) |
1122 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
1123 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
1124 | } | |
1125 | ||
1126 | llist_add(&evt->list, &vs->vs_event_list); | |
1127 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
1128 | } | |
1129 | ||
057cbf49 NB |
1130 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
1131 | { | |
a6c9af87 AH |
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 | ||
1136 | mutex_lock(&vq->mutex); | |
1137 | if (!vq->private_data) | |
1138 | goto out; | |
1139 | ||
1140 | if (vs->vs_events_missed) | |
1a1ff825 | 1141 | vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); |
a6c9af87 AH |
1142 | out: |
1143 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
1144 | } |
1145 | ||
1146 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
1147 | { | |
1148 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
1149 | poll.work); | |
1150 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1151 | ||
1b7f390e | 1152 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
1153 | } |
1154 | ||
4f7f46d3 AH |
1155 | static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
1156 | { | |
3ab2e420 | 1157 | vhost_poll_flush(&vs->vqs[index].vq.poll); |
4f7f46d3 AH |
1158 | } |
1159 | ||
3dfbff32 | 1160 | /* Callers must hold dev mutex */ |
4f7f46d3 AH |
1161 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
1162 | { | |
f2f0173d | 1163 | struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; |
4f7f46d3 AH |
1164 | int i; |
1165 | ||
f2f0173d | 1166 | /* Init new inflight and remember the old inflight */ |
1a1ff825 | 1167 | vhost_scsi_init_inflight(vs, old_inflight); |
f2f0173d AH |
1168 | |
1169 | /* | |
1170 | * The inflight->kref was initialized to 1. We decrement it here to | |
1171 | * indicate the start of the flush operation so that it will reach 0 | |
1172 | * when all the reqs are finished. | |
1173 | */ | |
1174 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1a1ff825 | 1175 | kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
1176 | |
1177 | /* Flush both the vhost poll and vhost work */ | |
4f7f46d3 AH |
1178 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
1179 | vhost_scsi_flush_vq(vs, i); | |
1180 | vhost_work_flush(&vs->dev, &vs->vs_completion_work); | |
a6c9af87 | 1181 | vhost_work_flush(&vs->dev, &vs->vs_event_work); |
f2f0173d AH |
1182 | |
1183 | /* Wait for all reqs issued before the flush to be finished */ | |
1184 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1185 | wait_for_completion(&old_inflight[i]->comp); | |
4f7f46d3 AH |
1186 | } |
1187 | ||
057cbf49 NB |
1188 | /* |
1189 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
1a1ff825 | 1190 | * vhost_scsi_tpg with an active struct vhost_scsi_nexus |
f2b7daf5 AH |
1191 | * |
1192 | * The lock nesting rule is: | |
1a1ff825 | 1193 | * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex |
057cbf49 | 1194 | */ |
683bd967 AH |
1195 | static int |
1196 | vhost_scsi_set_endpoint(struct vhost_scsi *vs, | |
1197 | struct vhost_scsi_target *t) | |
057cbf49 | 1198 | { |
ab8edab1 | 1199 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1200 | struct vhost_scsi_tport *tv_tport; |
1201 | struct vhost_scsi_tpg *tpg; | |
1202 | struct vhost_scsi_tpg **vs_tpg; | |
4f7f46d3 AH |
1203 | struct vhost_virtqueue *vq; |
1204 | int index, ret, i, len; | |
67e18cf9 | 1205 | bool match = false; |
057cbf49 | 1206 | |
1a1ff825 | 1207 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 1208 | mutex_lock(&vs->dev.mutex); |
f2b7daf5 | 1209 | |
057cbf49 NB |
1210 | /* Verify that ring has been setup correctly. */ |
1211 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
1212 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 1213 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
1214 | ret = -EFAULT; |
1215 | goto out; | |
057cbf49 NB |
1216 | } |
1217 | } | |
057cbf49 | 1218 | |
4f7f46d3 AH |
1219 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
1220 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
1221 | if (!vs_tpg) { | |
f2b7daf5 AH |
1222 | ret = -ENOMEM; |
1223 | goto out; | |
4f7f46d3 AH |
1224 | } |
1225 | if (vs->vs_tpg) | |
1226 | memcpy(vs_tpg, vs->vs_tpg, len); | |
1227 | ||
1a1ff825 | 1228 | list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) { |
98718312 AH |
1229 | mutex_lock(&tpg->tv_tpg_mutex); |
1230 | if (!tpg->tpg_nexus) { | |
1231 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1232 | continue; |
1233 | } | |
98718312 AH |
1234 | if (tpg->tv_tpg_vhost_count != 0) { |
1235 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1236 | continue; |
1237 | } | |
98718312 | 1238 | tv_tport = tpg->tport; |
057cbf49 | 1239 | |
67e18cf9 | 1240 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
98718312 | 1241 | if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
4f7f46d3 | 1242 | kfree(vs_tpg); |
98718312 | 1243 | mutex_unlock(&tpg->tv_tpg_mutex); |
f2b7daf5 AH |
1244 | ret = -EEXIST; |
1245 | goto out; | |
101998f6 | 1246 | } |
ab8edab1 NB |
1247 | /* |
1248 | * In order to ensure individual vhost-scsi configfs | |
1249 | * groups cannot be removed while in use by vhost ioctl, | |
1250 | * go ahead and take an explicit se_tpg->tpg_group.cg_item | |
1251 | * dependency now. | |
1252 | */ | |
1253 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1254 | ret = target_depend_item(&se_tpg->tpg_group.cg_item); |
ab8edab1 NB |
1255 | if (ret) { |
1256 | pr_warn("configfs_depend_item() failed: %d\n", ret); | |
1257 | kfree(vs_tpg); | |
1258 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1259 | goto out; | |
1260 | } | |
98718312 AH |
1261 | tpg->tv_tpg_vhost_count++; |
1262 | tpg->vhost_scsi = vs; | |
1263 | vs_tpg[tpg->tport_tpgt] = tpg; | |
4e857c58 | 1264 | smp_mb__after_atomic(); |
67e18cf9 | 1265 | match = true; |
057cbf49 | 1266 | } |
98718312 | 1267 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1268 | } |
67e18cf9 AH |
1269 | |
1270 | if (match) { | |
1271 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1272 | sizeof(vs->vs_vhost_wwpn)); | |
4f7f46d3 | 1273 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
3ab2e420 | 1274 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1275 | mutex_lock(&vq->mutex); |
22fa90c7 | 1276 | vq->private_data = vs_tpg; |
80f7d030 | 1277 | vhost_vq_init_access(vq); |
4f7f46d3 AH |
1278 | mutex_unlock(&vq->mutex); |
1279 | } | |
67e18cf9 AH |
1280 | ret = 0; |
1281 | } else { | |
1282 | ret = -EEXIST; | |
1283 | } | |
1284 | ||
4f7f46d3 AH |
1285 | /* |
1286 | * Act as synchronize_rcu to make sure access to | |
1287 | * old vs->vs_tpg is finished. | |
1288 | */ | |
1289 | vhost_scsi_flush(vs); | |
1290 | kfree(vs->vs_tpg); | |
1291 | vs->vs_tpg = vs_tpg; | |
1292 | ||
f2b7daf5 | 1293 | out: |
67e18cf9 | 1294 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1295 | mutex_unlock(&vhost_scsi_mutex); |
67e18cf9 | 1296 | return ret; |
057cbf49 NB |
1297 | } |
1298 | ||
683bd967 AH |
1299 | static int |
1300 | vhost_scsi_clear_endpoint(struct vhost_scsi *vs, | |
1301 | struct vhost_scsi_target *t) | |
057cbf49 | 1302 | { |
ab8edab1 | 1303 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1304 | struct vhost_scsi_tport *tv_tport; |
1305 | struct vhost_scsi_tpg *tpg; | |
4f7f46d3 AH |
1306 | struct vhost_virtqueue *vq; |
1307 | bool match = false; | |
67e18cf9 AH |
1308 | int index, ret, i; |
1309 | u8 target; | |
057cbf49 | 1310 | |
1a1ff825 | 1311 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 NB |
1312 | mutex_lock(&vs->dev.mutex); |
1313 | /* Verify that ring has been setup correctly. */ | |
1314 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1315 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1316 | ret = -EFAULT; |
038e0af4 | 1317 | goto err_dev; |
057cbf49 NB |
1318 | } |
1319 | } | |
4f7f46d3 AH |
1320 | |
1321 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1322 | ret = 0; |
1323 | goto err_dev; | |
4f7f46d3 AH |
1324 | } |
1325 | ||
67e18cf9 AH |
1326 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1327 | target = i; | |
98718312 AH |
1328 | tpg = vs->vs_tpg[target]; |
1329 | if (!tpg) | |
67e18cf9 AH |
1330 | continue; |
1331 | ||
98718312 AH |
1332 | mutex_lock(&tpg->tv_tpg_mutex); |
1333 | tv_tport = tpg->tport; | |
67e18cf9 AH |
1334 | if (!tv_tport) { |
1335 | ret = -ENODEV; | |
038e0af4 | 1336 | goto err_tpg; |
67e18cf9 AH |
1337 | } |
1338 | ||
1339 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
98718312 | 1340 | pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" |
67e18cf9 | 1341 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", |
98718312 | 1342 | tv_tport->tport_name, tpg->tport_tpgt, |
67e18cf9 AH |
1343 | t->vhost_wwpn, t->vhost_tpgt); |
1344 | ret = -EINVAL; | |
038e0af4 | 1345 | goto err_tpg; |
67e18cf9 | 1346 | } |
98718312 AH |
1347 | tpg->tv_tpg_vhost_count--; |
1348 | tpg->vhost_scsi = NULL; | |
67e18cf9 | 1349 | vs->vs_tpg[target] = NULL; |
4f7f46d3 | 1350 | match = true; |
98718312 | 1351 | mutex_unlock(&tpg->tv_tpg_mutex); |
ab8edab1 NB |
1352 | /* |
1353 | * Release se_tpg->tpg_group.cg_item configfs dependency now | |
1354 | * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur. | |
1355 | */ | |
1356 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1357 | target_undepend_item(&se_tpg->tpg_group.cg_item); |
057cbf49 | 1358 | } |
4f7f46d3 AH |
1359 | if (match) { |
1360 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
3ab2e420 | 1361 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1362 | mutex_lock(&vq->mutex); |
22fa90c7 | 1363 | vq->private_data = NULL; |
4f7f46d3 AH |
1364 | mutex_unlock(&vq->mutex); |
1365 | } | |
1366 | } | |
1367 | /* | |
1368 | * Act as synchronize_rcu to make sure access to | |
1369 | * old vs->vs_tpg is finished. | |
1370 | */ | |
1371 | vhost_scsi_flush(vs); | |
1372 | kfree(vs->vs_tpg); | |
1373 | vs->vs_tpg = NULL; | |
a6c9af87 | 1374 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1375 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1376 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 1377 | return 0; |
101998f6 | 1378 | |
038e0af4 | 1379 | err_tpg: |
98718312 | 1380 | mutex_unlock(&tpg->tv_tpg_mutex); |
038e0af4 | 1381 | err_dev: |
101998f6 | 1382 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1383 | mutex_unlock(&vhost_scsi_mutex); |
101998f6 | 1384 | return ret; |
057cbf49 NB |
1385 | } |
1386 | ||
4f7f46d3 AH |
1387 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1388 | { | |
ea16c514 MT |
1389 | struct vhost_virtqueue *vq; |
1390 | int i; | |
1391 | ||
4f7f46d3 AH |
1392 | if (features & ~VHOST_SCSI_FEATURES) |
1393 | return -EOPNOTSUPP; | |
1394 | ||
1395 | mutex_lock(&vs->dev.mutex); | |
1396 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1397 | !vhost_log_access_ok(&vs->dev)) { | |
1398 | mutex_unlock(&vs->dev.mutex); | |
1399 | return -EFAULT; | |
1400 | } | |
ea16c514 MT |
1401 | |
1402 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
1403 | vq = &vs->vqs[i].vq; | |
1404 | mutex_lock(&vq->mutex); | |
1405 | vq->acked_features = features; | |
1406 | mutex_unlock(&vq->mutex); | |
1407 | } | |
4f7f46d3 AH |
1408 | mutex_unlock(&vs->dev.mutex); |
1409 | return 0; | |
1410 | } | |
1411 | ||
057cbf49 NB |
1412 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1413 | { | |
c7289312 | 1414 | struct vhost_scsi *vs; |
3ab2e420 | 1415 | struct vhost_virtqueue **vqs; |
595cb754 | 1416 | int r = -ENOMEM, i; |
057cbf49 | 1417 | |
595cb754 MT |
1418 | vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
1419 | if (!vs) { | |
1420 | vs = vzalloc(sizeof(*vs)); | |
1421 | if (!vs) | |
1422 | goto err_vs; | |
1423 | } | |
057cbf49 | 1424 | |
3ab2e420 | 1425 | vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL); |
595cb754 MT |
1426 | if (!vqs) |
1427 | goto err_vqs; | |
3ab2e420 | 1428 | |
c7289312 | 1429 | vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); |
1a1ff825 | 1430 | vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work); |
a6c9af87 | 1431 | |
c7289312 AH |
1432 | vs->vs_events_nr = 0; |
1433 | vs->vs_events_missed = false; | |
057cbf49 | 1434 | |
c7289312 AH |
1435 | vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; |
1436 | vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1437 | vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1438 | vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
3ab2e420 | 1439 | for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { |
c7289312 AH |
1440 | vqs[i] = &vs->vqs[i].vq; |
1441 | vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
3ab2e420 | 1442 | } |
59566b6e | 1443 | vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ); |
f2f0173d | 1444 | |
1a1ff825 | 1445 | vhost_scsi_init_inflight(vs, NULL); |
f2f0173d | 1446 | |
c7289312 | 1447 | f->private_data = vs; |
057cbf49 | 1448 | return 0; |
595cb754 | 1449 | |
595cb754 | 1450 | err_vqs: |
68404441 | 1451 | kvfree(vs); |
595cb754 MT |
1452 | err_vs: |
1453 | return r; | |
057cbf49 NB |
1454 | } |
1455 | ||
1456 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1457 | { | |
c7289312 | 1458 | struct vhost_scsi *vs = f->private_data; |
67e18cf9 | 1459 | struct vhost_scsi_target t; |
057cbf49 | 1460 | |
c7289312 AH |
1461 | mutex_lock(&vs->dev.mutex); |
1462 | memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1463 | mutex_unlock(&vs->dev.mutex); | |
1464 | vhost_scsi_clear_endpoint(vs, &t); | |
1465 | vhost_dev_stop(&vs->dev); | |
1466 | vhost_dev_cleanup(&vs->dev, false); | |
a6c9af87 | 1467 | /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
c7289312 AH |
1468 | vhost_scsi_flush(vs); |
1469 | kfree(vs->dev.vqs); | |
68404441 | 1470 | kvfree(vs); |
057cbf49 NB |
1471 | return 0; |
1472 | } | |
1473 | ||
683bd967 AH |
1474 | static long |
1475 | vhost_scsi_ioctl(struct file *f, | |
1476 | unsigned int ioctl, | |
1477 | unsigned long arg) | |
057cbf49 NB |
1478 | { |
1479 | struct vhost_scsi *vs = f->private_data; | |
1480 | struct vhost_scsi_target backend; | |
1481 | void __user *argp = (void __user *)arg; | |
1482 | u64 __user *featurep = argp; | |
11c63418 AH |
1483 | u32 __user *eventsp = argp; |
1484 | u32 events_missed; | |
057cbf49 | 1485 | u64 features; |
101998f6 | 1486 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1487 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1488 | |
1489 | switch (ioctl) { | |
1490 | case VHOST_SCSI_SET_ENDPOINT: | |
1491 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1492 | return -EFAULT; | |
6de7145c MT |
1493 | if (backend.reserved != 0) |
1494 | return -EOPNOTSUPP; | |
057cbf49 NB |
1495 | |
1496 | return vhost_scsi_set_endpoint(vs, &backend); | |
1497 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1498 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1499 | return -EFAULT; | |
6de7145c MT |
1500 | if (backend.reserved != 0) |
1501 | return -EOPNOTSUPP; | |
057cbf49 NB |
1502 | |
1503 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1504 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1505 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1506 | return -EFAULT; |
1507 | return 0; | |
11c63418 AH |
1508 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1509 | if (get_user(events_missed, eventsp)) | |
1510 | return -EFAULT; | |
1511 | mutex_lock(&vq->mutex); | |
1512 | vs->vs_events_missed = events_missed; | |
1513 | mutex_unlock(&vq->mutex); | |
1514 | return 0; | |
1515 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1516 | mutex_lock(&vq->mutex); | |
1517 | events_missed = vs->vs_events_missed; | |
1518 | mutex_unlock(&vq->mutex); | |
1519 | if (put_user(events_missed, eventsp)) | |
1520 | return -EFAULT; | |
1521 | return 0; | |
057cbf49 | 1522 | case VHOST_GET_FEATURES: |
5dade710 | 1523 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1524 | if (copy_to_user(featurep, &features, sizeof features)) |
1525 | return -EFAULT; | |
1526 | return 0; | |
1527 | case VHOST_SET_FEATURES: | |
1528 | if (copy_from_user(&features, featurep, sizeof features)) | |
1529 | return -EFAULT; | |
1530 | return vhost_scsi_set_features(vs, features); | |
1531 | default: | |
1532 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1533 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1534 | /* TODO: flush backend after dev ioctl. */ | |
1535 | if (r == -ENOIOCTLCMD) | |
1536 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1537 | mutex_unlock(&vs->dev.mutex); |
1538 | return r; | |
1539 | } | |
1540 | } | |
1541 | ||
101998f6 NB |
1542 | #ifdef CONFIG_COMPAT |
1543 | static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, | |
1544 | unsigned long arg) | |
1545 | { | |
1546 | return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1547 | } | |
1548 | #endif | |
1549 | ||
057cbf49 NB |
1550 | static const struct file_operations vhost_scsi_fops = { |
1551 | .owner = THIS_MODULE, | |
1552 | .release = vhost_scsi_release, | |
1553 | .unlocked_ioctl = vhost_scsi_ioctl, | |
101998f6 NB |
1554 | #ifdef CONFIG_COMPAT |
1555 | .compat_ioctl = vhost_scsi_compat_ioctl, | |
1556 | #endif | |
057cbf49 NB |
1557 | .open = vhost_scsi_open, |
1558 | .llseek = noop_llseek, | |
1559 | }; | |
1560 | ||
1561 | static struct miscdevice vhost_scsi_misc = { | |
1562 | MISC_DYNAMIC_MINOR, | |
1563 | "vhost-scsi", | |
1564 | &vhost_scsi_fops, | |
1565 | }; | |
1566 | ||
1567 | static int __init vhost_scsi_register(void) | |
1568 | { | |
1569 | return misc_register(&vhost_scsi_misc); | |
1570 | } | |
1571 | ||
f368ed60 | 1572 | static void vhost_scsi_deregister(void) |
057cbf49 | 1573 | { |
f368ed60 | 1574 | misc_deregister(&vhost_scsi_misc); |
057cbf49 NB |
1575 | } |
1576 | ||
1a1ff825 | 1577 | static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport) |
057cbf49 NB |
1578 | { |
1579 | switch (tport->tport_proto_id) { | |
1580 | case SCSI_PROTOCOL_SAS: | |
1581 | return "SAS"; | |
1582 | case SCSI_PROTOCOL_FCP: | |
1583 | return "FCP"; | |
1584 | case SCSI_PROTOCOL_ISCSI: | |
1585 | return "iSCSI"; | |
1586 | default: | |
1587 | break; | |
1588 | } | |
1589 | ||
1590 | return "Unknown"; | |
1591 | } | |
1592 | ||
683bd967 | 1593 | static void |
1a1ff825 | 1594 | vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg, |
683bd967 | 1595 | struct se_lun *lun, bool plug) |
a6c9af87 AH |
1596 | { |
1597 | ||
1598 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1599 | struct vhost_virtqueue *vq; | |
1600 | u32 reason; | |
1601 | ||
1602 | if (!vs) | |
1603 | return; | |
1604 | ||
1605 | mutex_lock(&vs->dev.mutex); | |
a6c9af87 AH |
1606 | |
1607 | if (plug) | |
1608 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1609 | else | |
1610 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1611 | ||
3ab2e420 | 1612 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 | 1613 | mutex_lock(&vq->mutex); |
ea16c514 | 1614 | if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG)) |
1a1ff825 | 1615 | vhost_scsi_send_evt(vs, tpg, lun, |
ea16c514 | 1616 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); |
a6c9af87 AH |
1617 | mutex_unlock(&vq->mutex); |
1618 | mutex_unlock(&vs->dev.mutex); | |
1619 | } | |
1620 | ||
1a1ff825 | 1621 | static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1622 | { |
1a1ff825 | 1623 | vhost_scsi_do_plug(tpg, lun, true); |
a6c9af87 AH |
1624 | } |
1625 | ||
1a1ff825 | 1626 | static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1627 | { |
1a1ff825 | 1628 | vhost_scsi_do_plug(tpg, lun, false); |
a6c9af87 AH |
1629 | } |
1630 | ||
1a1ff825 | 1631 | static int vhost_scsi_port_link(struct se_portal_group *se_tpg, |
683bd967 | 1632 | struct se_lun *lun) |
057cbf49 | 1633 | { |
1a1ff825 NB |
1634 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1635 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1636 | |
1a1ff825 | 1637 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1638 | |
98718312 AH |
1639 | mutex_lock(&tpg->tv_tpg_mutex); |
1640 | tpg->tv_tpg_port_count++; | |
1641 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 | 1642 | |
1a1ff825 | 1643 | vhost_scsi_hotplug(tpg, lun); |
a6c9af87 | 1644 | |
1a1ff825 | 1645 | mutex_unlock(&vhost_scsi_mutex); |
a6c9af87 | 1646 | |
057cbf49 NB |
1647 | return 0; |
1648 | } | |
1649 | ||
1a1ff825 | 1650 | static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg, |
683bd967 | 1651 | struct se_lun *lun) |
057cbf49 | 1652 | { |
1a1ff825 NB |
1653 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1654 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1655 | |
1a1ff825 | 1656 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1657 | |
98718312 AH |
1658 | mutex_lock(&tpg->tv_tpg_mutex); |
1659 | tpg->tv_tpg_port_count--; | |
1660 | mutex_unlock(&tpg->tv_tpg_mutex); | |
a6c9af87 | 1661 | |
1a1ff825 | 1662 | vhost_scsi_hotunplug(tpg, lun); |
a6c9af87 | 1663 | |
1a1ff825 | 1664 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 NB |
1665 | } |
1666 | ||
65ea7898 | 1667 | static void vhost_scsi_free_cmd_map_res(struct se_session *se_sess) |
3aee26b4 | 1668 | { |
1a1ff825 | 1669 | struct vhost_scsi_cmd *tv_cmd; |
3aee26b4 NB |
1670 | unsigned int i; |
1671 | ||
1672 | if (!se_sess->sess_cmd_map) | |
1673 | return; | |
1674 | ||
1a1ff825 NB |
1675 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1676 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 NB |
1677 | |
1678 | kfree(tv_cmd->tvc_sgl); | |
b1935f68 | 1679 | kfree(tv_cmd->tvc_prot_sgl); |
3aee26b4 NB |
1680 | kfree(tv_cmd->tvc_upages); |
1681 | } | |
1682 | } | |
1683 | ||
2eafd729 CH |
1684 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store( |
1685 | struct config_item *item, const char *page, size_t count) | |
b1d75fe5 | 1686 | { |
2eafd729 | 1687 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
b1d75fe5 NB |
1688 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1689 | struct vhost_scsi_tpg, se_tpg); | |
1690 | unsigned long val; | |
1691 | int ret = kstrtoul(page, 0, &val); | |
1692 | ||
1693 | if (ret) { | |
1694 | pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); | |
1695 | return ret; | |
1696 | } | |
1697 | if (val != 0 && val != 1 && val != 3) { | |
1698 | pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val); | |
1699 | return -EINVAL; | |
1700 | } | |
1701 | tpg->tv_fabric_prot_type = val; | |
1702 | ||
1703 | return count; | |
1704 | } | |
1705 | ||
2eafd729 CH |
1706 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show( |
1707 | struct config_item *item, char *page) | |
b1d75fe5 | 1708 | { |
2eafd729 | 1709 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
b1d75fe5 NB |
1710 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1711 | struct vhost_scsi_tpg, se_tpg); | |
1712 | ||
1713 | return sprintf(page, "%d\n", tpg->tv_fabric_prot_type); | |
1714 | } | |
2eafd729 CH |
1715 | |
1716 | CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type); | |
b1d75fe5 NB |
1717 | |
1718 | static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = { | |
2eafd729 | 1719 | &vhost_scsi_tpg_attrib_attr_fabric_prot_type, |
b1d75fe5 NB |
1720 | NULL, |
1721 | }; | |
1722 | ||
65ea7898 NB |
1723 | static int vhost_scsi_nexus_cb(struct se_portal_group *se_tpg, |
1724 | struct se_session *se_sess, void *p) | |
057cbf49 | 1725 | { |
1a1ff825 | 1726 | struct vhost_scsi_cmd *tv_cmd; |
3aee26b4 | 1727 | unsigned int i; |
057cbf49 | 1728 | |
1a1ff825 NB |
1729 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1730 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 NB |
1731 | |
1732 | tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) * | |
1a1ff825 | 1733 | VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL); |
3aee26b4 | 1734 | if (!tv_cmd->tvc_sgl) { |
3aee26b4 NB |
1735 | pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); |
1736 | goto out; | |
1737 | } | |
1738 | ||
1739 | tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) * | |
65ea7898 | 1740 | VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL); |
3aee26b4 | 1741 | if (!tv_cmd->tvc_upages) { |
3aee26b4 NB |
1742 | pr_err("Unable to allocate tv_cmd->tvc_upages\n"); |
1743 | goto out; | |
1744 | } | |
b1935f68 NB |
1745 | |
1746 | tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) * | |
65ea7898 | 1747 | VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL); |
b1935f68 | 1748 | if (!tv_cmd->tvc_prot_sgl) { |
b1935f68 NB |
1749 | pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); |
1750 | goto out; | |
1751 | } | |
3aee26b4 | 1752 | } |
65ea7898 NB |
1753 | return 0; |
1754 | out: | |
1755 | vhost_scsi_free_cmd_map_res(se_sess); | |
1756 | return -ENOMEM; | |
1757 | } | |
1758 | ||
1759 | static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg, | |
1760 | const char *name) | |
1761 | { | |
1762 | struct se_portal_group *se_tpg; | |
1763 | struct vhost_scsi_nexus *tv_nexus; | |
1764 | ||
1765 | mutex_lock(&tpg->tv_tpg_mutex); | |
1766 | if (tpg->tpg_nexus) { | |
1767 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1768 | pr_debug("tpg->tpg_nexus already exists\n"); | |
1769 | return -EEXIST; | |
1770 | } | |
1771 | se_tpg = &tpg->se_tpg; | |
1772 | ||
1773 | tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL); | |
1774 | if (!tv_nexus) { | |
1775 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1776 | pr_err("Unable to allocate struct vhost_scsi_nexus\n"); | |
1777 | return -ENOMEM; | |
1778 | } | |
057cbf49 NB |
1779 | /* |
1780 | * Since we are running in 'demo mode' this call with generate a | |
1a1ff825 | 1781 | * struct se_node_acl for the vhost_scsi struct se_portal_group with |
057cbf49 NB |
1782 | * the SCSI Initiator port name of the passed configfs group 'name'. |
1783 | */ | |
65ea7898 NB |
1784 | tv_nexus->tvn_se_sess = target_alloc_session(&tpg->se_tpg, |
1785 | VHOST_SCSI_DEFAULT_TAGS, | |
1786 | sizeof(struct vhost_scsi_cmd), | |
1787 | TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS, | |
1788 | (unsigned char *)name, tv_nexus, | |
1789 | vhost_scsi_nexus_cb); | |
1790 | if (IS_ERR(tv_nexus->tvn_se_sess)) { | |
98718312 | 1791 | mutex_unlock(&tpg->tv_tpg_mutex); |
65ea7898 NB |
1792 | kfree(tv_nexus); |
1793 | return -ENOMEM; | |
057cbf49 | 1794 | } |
98718312 | 1795 | tpg->tpg_nexus = tv_nexus; |
057cbf49 | 1796 | |
98718312 | 1797 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1798 | return 0; |
1799 | } | |
1800 | ||
1a1ff825 | 1801 | static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg) |
057cbf49 NB |
1802 | { |
1803 | struct se_session *se_sess; | |
1a1ff825 | 1804 | struct vhost_scsi_nexus *tv_nexus; |
057cbf49 NB |
1805 | |
1806 | mutex_lock(&tpg->tv_tpg_mutex); | |
1807 | tv_nexus = tpg->tpg_nexus; | |
1808 | if (!tv_nexus) { | |
1809 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1810 | return -ENODEV; | |
1811 | } | |
1812 | ||
1813 | se_sess = tv_nexus->tvn_se_sess; | |
1814 | if (!se_sess) { | |
1815 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1816 | return -ENODEV; | |
1817 | } | |
1818 | ||
101998f6 | 1819 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 1820 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1821 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1822 | " active TPG port count: %d\n", |
101998f6 NB |
1823 | tpg->tv_tpg_port_count); |
1824 | return -EBUSY; | |
057cbf49 NB |
1825 | } |
1826 | ||
101998f6 | 1827 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 1828 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1829 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1830 | " active TPG vhost count: %d\n", |
101998f6 NB |
1831 | tpg->tv_tpg_vhost_count); |
1832 | return -EBUSY; | |
057cbf49 NB |
1833 | } |
1834 | ||
101998f6 | 1835 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
1a1ff825 | 1836 | " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport), |
057cbf49 | 1837 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
3aee26b4 | 1838 | |
65ea7898 | 1839 | vhost_scsi_free_cmd_map_res(se_sess); |
057cbf49 | 1840 | /* |
101998f6 | 1841 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 NB |
1842 | */ |
1843 | transport_deregister_session(tv_nexus->tvn_se_sess); | |
1844 | tpg->tpg_nexus = NULL; | |
1845 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1846 | ||
1847 | kfree(tv_nexus); | |
1848 | return 0; | |
1849 | } | |
1850 | ||
2eafd729 | 1851 | static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page) |
057cbf49 | 1852 | { |
2eafd729 | 1853 | struct se_portal_group *se_tpg = to_tpg(item); |
1a1ff825 NB |
1854 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1855 | struct vhost_scsi_tpg, se_tpg); | |
1856 | struct vhost_scsi_nexus *tv_nexus; | |
057cbf49 NB |
1857 | ssize_t ret; |
1858 | ||
98718312 AH |
1859 | mutex_lock(&tpg->tv_tpg_mutex); |
1860 | tv_nexus = tpg->tpg_nexus; | |
057cbf49 | 1861 | if (!tv_nexus) { |
98718312 | 1862 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1863 | return -ENODEV; |
1864 | } | |
1865 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1866 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
98718312 | 1867 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1868 | |
1869 | return ret; | |
1870 | } | |
1871 | ||
2eafd729 CH |
1872 | static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item, |
1873 | const char *page, size_t count) | |
057cbf49 | 1874 | { |
2eafd729 | 1875 | struct se_portal_group *se_tpg = to_tpg(item); |
1a1ff825 NB |
1876 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1877 | struct vhost_scsi_tpg, se_tpg); | |
1878 | struct vhost_scsi_tport *tport_wwn = tpg->tport; | |
1879 | unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr; | |
057cbf49 NB |
1880 | int ret; |
1881 | /* | |
1882 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
1883 | */ | |
1884 | if (!strncmp(page, "NULL", 4)) { | |
1a1ff825 | 1885 | ret = vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
1886 | return (!ret) ? count : ret; |
1887 | } | |
1888 | /* | |
1889 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1a1ff825 NB |
1890 | * the fabric protocol_id set in vhost_scsi_make_tport(), and call |
1891 | * vhost_scsi_make_nexus(). | |
057cbf49 | 1892 | */ |
1a1ff825 | 1893 | if (strlen(page) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 1894 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
1a1ff825 | 1895 | " max: %d\n", page, VHOST_SCSI_NAMELEN); |
057cbf49 NB |
1896 | return -EINVAL; |
1897 | } | |
1a1ff825 | 1898 | snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page); |
057cbf49 NB |
1899 | |
1900 | ptr = strstr(i_port, "naa."); | |
1901 | if (ptr) { | |
1902 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
1903 | pr_err("Passed SAS Initiator Port %s does not" | |
1904 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 1905 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
1906 | return -EINVAL; |
1907 | } | |
1908 | port_ptr = &i_port[0]; | |
1909 | goto check_newline; | |
1910 | } | |
1911 | ptr = strstr(i_port, "fc."); | |
1912 | if (ptr) { | |
1913 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
1914 | pr_err("Passed FCP Initiator Port %s does not" | |
1915 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 1916 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
1917 | return -EINVAL; |
1918 | } | |
1919 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1920 | goto check_newline; | |
1921 | } | |
1922 | ptr = strstr(i_port, "iqn."); | |
1923 | if (ptr) { | |
1924 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
1925 | pr_err("Passed iSCSI Initiator Port %s does not" | |
1926 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 1927 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
1928 | return -EINVAL; |
1929 | } | |
1930 | port_ptr = &i_port[0]; | |
1931 | goto check_newline; | |
1932 | } | |
1933 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
1934 | " %s\n", i_port); | |
1935 | return -EINVAL; | |
1936 | /* | |
1937 | * Clear any trailing newline for the NAA WWN | |
1938 | */ | |
1939 | check_newline: | |
1940 | if (i_port[strlen(i_port)-1] == '\n') | |
1941 | i_port[strlen(i_port)-1] = '\0'; | |
1942 | ||
1a1ff825 | 1943 | ret = vhost_scsi_make_nexus(tpg, port_ptr); |
057cbf49 NB |
1944 | if (ret < 0) |
1945 | return ret; | |
1946 | ||
1947 | return count; | |
1948 | } | |
1949 | ||
2eafd729 | 1950 | CONFIGFS_ATTR(vhost_scsi_tpg_, nexus); |
057cbf49 | 1951 | |
1a1ff825 | 1952 | static struct configfs_attribute *vhost_scsi_tpg_attrs[] = { |
2eafd729 | 1953 | &vhost_scsi_tpg_attr_nexus, |
057cbf49 NB |
1954 | NULL, |
1955 | }; | |
1956 | ||
683bd967 | 1957 | static struct se_portal_group * |
1a1ff825 | 1958 | vhost_scsi_make_tpg(struct se_wwn *wwn, |
683bd967 AH |
1959 | struct config_group *group, |
1960 | const char *name) | |
057cbf49 | 1961 | { |
1a1ff825 NB |
1962 | struct vhost_scsi_tport *tport = container_of(wwn, |
1963 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 | 1964 | |
1a1ff825 | 1965 | struct vhost_scsi_tpg *tpg; |
59c816c1 | 1966 | u16 tpgt; |
057cbf49 NB |
1967 | int ret; |
1968 | ||
1969 | if (strstr(name, "tpgt_") != name) | |
1970 | return ERR_PTR(-EINVAL); | |
59c816c1 | 1971 | if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET) |
057cbf49 NB |
1972 | return ERR_PTR(-EINVAL); |
1973 | ||
1a1ff825 | 1974 | tpg = kzalloc(sizeof(struct vhost_scsi_tpg), GFP_KERNEL); |
057cbf49 | 1975 | if (!tpg) { |
1a1ff825 | 1976 | pr_err("Unable to allocate struct vhost_scsi_tpg"); |
057cbf49 NB |
1977 | return ERR_PTR(-ENOMEM); |
1978 | } | |
1979 | mutex_init(&tpg->tv_tpg_mutex); | |
1980 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
1981 | tpg->tport = tport; | |
1982 | tpg->tport_tpgt = tpgt; | |
1983 | ||
bc0c94b1 | 1984 | ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id); |
057cbf49 NB |
1985 | if (ret < 0) { |
1986 | kfree(tpg); | |
1987 | return NULL; | |
1988 | } | |
1a1ff825 NB |
1989 | mutex_lock(&vhost_scsi_mutex); |
1990 | list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list); | |
1991 | mutex_unlock(&vhost_scsi_mutex); | |
057cbf49 NB |
1992 | |
1993 | return &tpg->se_tpg; | |
1994 | } | |
1995 | ||
1a1ff825 | 1996 | static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg) |
057cbf49 | 1997 | { |
1a1ff825 NB |
1998 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1999 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 2000 | |
1a1ff825 | 2001 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 2002 | list_del(&tpg->tv_tpg_list); |
1a1ff825 | 2003 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 2004 | /* |
101998f6 | 2005 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 | 2006 | */ |
1a1ff825 | 2007 | vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
2008 | /* |
2009 | * Deregister the se_tpg from TCM.. | |
2010 | */ | |
2011 | core_tpg_deregister(se_tpg); | |
2012 | kfree(tpg); | |
2013 | } | |
2014 | ||
683bd967 | 2015 | static struct se_wwn * |
1a1ff825 | 2016 | vhost_scsi_make_tport(struct target_fabric_configfs *tf, |
683bd967 AH |
2017 | struct config_group *group, |
2018 | const char *name) | |
057cbf49 | 2019 | { |
1a1ff825 | 2020 | struct vhost_scsi_tport *tport; |
057cbf49 NB |
2021 | char *ptr; |
2022 | u64 wwpn = 0; | |
2023 | int off = 0; | |
2024 | ||
1a1ff825 | 2025 | /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0) |
057cbf49 NB |
2026 | return ERR_PTR(-EINVAL); */ |
2027 | ||
1a1ff825 | 2028 | tport = kzalloc(sizeof(struct vhost_scsi_tport), GFP_KERNEL); |
057cbf49 | 2029 | if (!tport) { |
1a1ff825 | 2030 | pr_err("Unable to allocate struct vhost_scsi_tport"); |
057cbf49 NB |
2031 | return ERR_PTR(-ENOMEM); |
2032 | } | |
2033 | tport->tport_wwpn = wwpn; | |
2034 | /* | |
2035 | * Determine the emulated Protocol Identifier and Target Port Name | |
2036 | * based on the incoming configfs directory name. | |
2037 | */ | |
2038 | ptr = strstr(name, "naa."); | |
2039 | if (ptr) { | |
2040 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
2041 | goto check_len; | |
2042 | } | |
2043 | ptr = strstr(name, "fc."); | |
2044 | if (ptr) { | |
2045 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
2046 | off = 3; /* Skip over "fc." */ | |
2047 | goto check_len; | |
2048 | } | |
2049 | ptr = strstr(name, "iqn."); | |
2050 | if (ptr) { | |
2051 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
2052 | goto check_len; | |
2053 | } | |
2054 | ||
2055 | pr_err("Unable to locate prefix for emulated Target Port:" | |
2056 | " %s\n", name); | |
2057 | kfree(tport); | |
2058 | return ERR_PTR(-EINVAL); | |
2059 | ||
2060 | check_len: | |
1a1ff825 | 2061 | if (strlen(name) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2062 | pr_err("Emulated %s Address: %s, exceeds" |
1a1ff825 NB |
2063 | " max: %d\n", name, vhost_scsi_dump_proto_id(tport), |
2064 | VHOST_SCSI_NAMELEN); | |
057cbf49 NB |
2065 | kfree(tport); |
2066 | return ERR_PTR(-EINVAL); | |
2067 | } | |
1a1ff825 | 2068 | snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]); |
057cbf49 NB |
2069 | |
2070 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
1a1ff825 | 2071 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name); |
057cbf49 NB |
2072 | |
2073 | return &tport->tport_wwn; | |
2074 | } | |
2075 | ||
1a1ff825 | 2076 | static void vhost_scsi_drop_tport(struct se_wwn *wwn) |
057cbf49 | 2077 | { |
1a1ff825 NB |
2078 | struct vhost_scsi_tport *tport = container_of(wwn, |
2079 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 NB |
2080 | |
2081 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
1a1ff825 | 2082 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), |
057cbf49 NB |
2083 | tport->tport_name); |
2084 | ||
2085 | kfree(tport); | |
2086 | } | |
2087 | ||
683bd967 | 2088 | static ssize_t |
2eafd729 | 2089 | vhost_scsi_wwn_version_show(struct config_item *item, char *page) |
057cbf49 NB |
2090 | { |
2091 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" | |
1a1ff825 | 2092 | "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 NB |
2093 | utsname()->machine); |
2094 | } | |
2095 | ||
2eafd729 | 2096 | CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version); |
057cbf49 | 2097 | |
1a1ff825 | 2098 | static struct configfs_attribute *vhost_scsi_wwn_attrs[] = { |
2eafd729 | 2099 | &vhost_scsi_wwn_attr_version, |
057cbf49 NB |
2100 | NULL, |
2101 | }; | |
2102 | ||
1a1ff825 | 2103 | static struct target_core_fabric_ops vhost_scsi_ops = { |
9ac8928e CH |
2104 | .module = THIS_MODULE, |
2105 | .name = "vhost", | |
1a1ff825 | 2106 | .get_fabric_name = vhost_scsi_get_fabric_name, |
1a1ff825 NB |
2107 | .tpg_get_wwn = vhost_scsi_get_fabric_wwn, |
2108 | .tpg_get_tag = vhost_scsi_get_tpgt, | |
1a1ff825 NB |
2109 | .tpg_check_demo_mode = vhost_scsi_check_true, |
2110 | .tpg_check_demo_mode_cache = vhost_scsi_check_true, | |
2111 | .tpg_check_demo_mode_write_protect = vhost_scsi_check_false, | |
2112 | .tpg_check_prod_mode_write_protect = vhost_scsi_check_false, | |
b1d75fe5 | 2113 | .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only, |
1a1ff825 NB |
2114 | .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index, |
2115 | .release_cmd = vhost_scsi_release_cmd, | |
084ed45b | 2116 | .check_stop_free = vhost_scsi_check_stop_free, |
1a1ff825 NB |
2117 | .shutdown_session = vhost_scsi_shutdown_session, |
2118 | .close_session = vhost_scsi_close_session, | |
2119 | .sess_get_index = vhost_scsi_sess_get_index, | |
057cbf49 | 2120 | .sess_get_initiator_sid = NULL, |
1a1ff825 NB |
2121 | .write_pending = vhost_scsi_write_pending, |
2122 | .write_pending_status = vhost_scsi_write_pending_status, | |
2123 | .set_default_node_attributes = vhost_scsi_set_default_node_attrs, | |
1a1ff825 NB |
2124 | .get_cmd_state = vhost_scsi_get_cmd_state, |
2125 | .queue_data_in = vhost_scsi_queue_data_in, | |
2126 | .queue_status = vhost_scsi_queue_status, | |
2127 | .queue_tm_rsp = vhost_scsi_queue_tm_rsp, | |
2128 | .aborted_task = vhost_scsi_aborted_task, | |
057cbf49 NB |
2129 | /* |
2130 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
2131 | */ | |
1a1ff825 NB |
2132 | .fabric_make_wwn = vhost_scsi_make_tport, |
2133 | .fabric_drop_wwn = vhost_scsi_drop_tport, | |
2134 | .fabric_make_tpg = vhost_scsi_make_tpg, | |
2135 | .fabric_drop_tpg = vhost_scsi_drop_tpg, | |
2136 | .fabric_post_link = vhost_scsi_port_link, | |
2137 | .fabric_pre_unlink = vhost_scsi_port_unlink, | |
9ac8928e CH |
2138 | |
2139 | .tfc_wwn_attrs = vhost_scsi_wwn_attrs, | |
2140 | .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs, | |
2141 | .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs, | |
057cbf49 NB |
2142 | }; |
2143 | ||
9ac8928e | 2144 | static int __init vhost_scsi_init(void) |
057cbf49 | 2145 | { |
9ac8928e | 2146 | int ret = -ENOMEM; |
057cbf49 | 2147 | |
9ac8928e | 2148 | pr_debug("TCM_VHOST fabric module %s on %s/%s" |
1a1ff825 | 2149 | " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 | 2150 | utsname()->machine); |
057cbf49 | 2151 | |
101998f6 NB |
2152 | /* |
2153 | * Use our own dedicated workqueue for submitting I/O into | |
2154 | * target core to avoid contention within system_wq. | |
2155 | */ | |
1a1ff825 NB |
2156 | vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0); |
2157 | if (!vhost_scsi_workqueue) | |
057cbf49 NB |
2158 | goto out; |
2159 | ||
2160 | ret = vhost_scsi_register(); | |
2161 | if (ret < 0) | |
2162 | goto out_destroy_workqueue; | |
2163 | ||
9ac8928e | 2164 | ret = target_register_template(&vhost_scsi_ops); |
057cbf49 NB |
2165 | if (ret < 0) |
2166 | goto out_vhost_scsi_deregister; | |
2167 | ||
2168 | return 0; | |
2169 | ||
2170 | out_vhost_scsi_deregister: | |
2171 | vhost_scsi_deregister(); | |
2172 | out_destroy_workqueue: | |
1a1ff825 | 2173 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2174 | out: |
2175 | return ret; | |
2176 | }; | |
2177 | ||
1a1ff825 | 2178 | static void vhost_scsi_exit(void) |
057cbf49 | 2179 | { |
9ac8928e | 2180 | target_unregister_template(&vhost_scsi_ops); |
057cbf49 | 2181 | vhost_scsi_deregister(); |
1a1ff825 | 2182 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2183 | }; |
2184 | ||
181c04a3 MT |
2185 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
2186 | MODULE_ALIAS("tcm_vhost"); | |
057cbf49 | 2187 | MODULE_LICENSE("GPL"); |
1a1ff825 NB |
2188 | module_init(vhost_scsi_init); |
2189 | module_exit(vhost_scsi_exit); |