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> | |
45 | #include <target/target_core_fabric_configfs.h> | |
057cbf49 NB |
46 | #include <target/configfs_macros.h> |
47 | #include <linux/vhost.h> | |
057cbf49 | 48 | #include <linux/virtio_scsi.h> |
9d6064a3 | 49 | #include <linux/llist.h> |
1b7f390e | 50 | #include <linux/bitmap.h> |
4824d3bf | 51 | #include <linux/percpu_ida.h> |
057cbf49 | 52 | |
057cbf49 | 53 | #include "vhost.h" |
5012a3a3 | 54 | |
1a1ff825 NB |
55 | #define VHOST_SCSI_VERSION "v0.1" |
56 | #define VHOST_SCSI_NAMELEN 256 | |
57 | #define VHOST_SCSI_MAX_CDB_SIZE 32 | |
58 | #define VHOST_SCSI_DEFAULT_TAGS 256 | |
59 | #define VHOST_SCSI_PREALLOC_SGLS 2048 | |
60 | #define VHOST_SCSI_PREALLOC_UPAGES 2048 | |
61 | #define VHOST_SCSI_PREALLOC_PROT_SGLS 512 | |
5012a3a3 MT |
62 | |
63 | struct vhost_scsi_inflight { | |
64 | /* Wait for the flush operation to finish */ | |
65 | struct completion comp; | |
66 | /* Refcount for the inflight reqs */ | |
67 | struct kref kref; | |
68 | }; | |
69 | ||
1a1ff825 | 70 | struct vhost_scsi_cmd { |
5012a3a3 MT |
71 | /* Descriptor from vhost_get_vq_desc() for virt_queue segment */ |
72 | int tvc_vq_desc; | |
73 | /* virtio-scsi initiator task attribute */ | |
74 | int tvc_task_attr; | |
79c14141 NB |
75 | /* virtio-scsi response incoming iovecs */ |
76 | int tvc_in_iovs; | |
5012a3a3 MT |
77 | /* virtio-scsi initiator data direction */ |
78 | enum dma_data_direction tvc_data_direction; | |
79 | /* Expected data transfer length from virtio-scsi header */ | |
80 | u32 tvc_exp_data_len; | |
81 | /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */ | |
82 | u64 tvc_tag; | |
83 | /* The number of scatterlists associated with this cmd */ | |
84 | u32 tvc_sgl_count; | |
e31885dd | 85 | u32 tvc_prot_sgl_count; |
1a1ff825 | 86 | /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */ |
5012a3a3 MT |
87 | u32 tvc_lun; |
88 | /* Pointer to the SGL formatted memory from virtio-scsi */ | |
89 | struct scatterlist *tvc_sgl; | |
b1935f68 | 90 | struct scatterlist *tvc_prot_sgl; |
3aee26b4 | 91 | struct page **tvc_upages; |
79c14141 NB |
92 | /* Pointer to response header iovec */ |
93 | struct iovec *tvc_resp_iov; | |
5012a3a3 MT |
94 | /* Pointer to vhost_scsi for our device */ |
95 | struct vhost_scsi *tvc_vhost; | |
96 | /* Pointer to vhost_virtqueue for the cmd */ | |
97 | struct vhost_virtqueue *tvc_vq; | |
98 | /* Pointer to vhost nexus memory */ | |
1a1ff825 | 99 | struct vhost_scsi_nexus *tvc_nexus; |
5012a3a3 MT |
100 | /* The TCM I/O descriptor that is accessed via container_of() */ |
101 | struct se_cmd tvc_se_cmd; | |
1a1ff825 | 102 | /* work item used for cmwq dispatch to vhost_scsi_submission_work() */ |
5012a3a3 MT |
103 | struct work_struct work; |
104 | /* Copy of the incoming SCSI command descriptor block (CDB) */ | |
1a1ff825 | 105 | unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE]; |
5012a3a3 MT |
106 | /* Sense buffer that will be mapped into outgoing status */ |
107 | unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER]; | |
108 | /* Completed commands list, serviced from vhost worker thread */ | |
109 | struct llist_node tvc_completion_list; | |
110 | /* Used to track inflight cmd */ | |
111 | struct vhost_scsi_inflight *inflight; | |
112 | }; | |
113 | ||
1a1ff825 | 114 | struct vhost_scsi_nexus { |
5012a3a3 MT |
115 | /* Pointer to TCM session for I_T Nexus */ |
116 | struct se_session *tvn_se_sess; | |
117 | }; | |
118 | ||
1a1ff825 | 119 | struct vhost_scsi_tpg { |
5012a3a3 MT |
120 | /* Vhost port target portal group tag for TCM */ |
121 | u16 tport_tpgt; | |
122 | /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */ | |
123 | int tv_tpg_port_count; | |
124 | /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */ | |
125 | int tv_tpg_vhost_count; | |
b1d75fe5 NB |
126 | /* Used for enabling T10-PI with legacy devices */ |
127 | int tv_fabric_prot_type; | |
1a1ff825 | 128 | /* list for vhost_scsi_list */ |
5012a3a3 MT |
129 | struct list_head tv_tpg_list; |
130 | /* Used to protect access for tpg_nexus */ | |
131 | struct mutex tv_tpg_mutex; | |
132 | /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */ | |
1a1ff825 NB |
133 | struct vhost_scsi_nexus *tpg_nexus; |
134 | /* Pointer back to vhost_scsi_tport */ | |
135 | struct vhost_scsi_tport *tport; | |
136 | /* Returned by vhost_scsi_make_tpg() */ | |
5012a3a3 MT |
137 | struct se_portal_group se_tpg; |
138 | /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */ | |
139 | struct vhost_scsi *vhost_scsi; | |
140 | }; | |
141 | ||
1a1ff825 | 142 | struct vhost_scsi_tport { |
5012a3a3 MT |
143 | /* SCSI protocol the tport is providing */ |
144 | u8 tport_proto_id; | |
145 | /* Binary World Wide unique Port Name for Vhost Target port */ | |
146 | u64 tport_wwpn; | |
147 | /* ASCII formatted WWPN for Vhost Target port */ | |
1a1ff825 NB |
148 | char tport_name[VHOST_SCSI_NAMELEN]; |
149 | /* Returned by vhost_scsi_make_tport() */ | |
5012a3a3 MT |
150 | struct se_wwn tport_wwn; |
151 | }; | |
152 | ||
1a1ff825 | 153 | struct vhost_scsi_evt { |
5012a3a3 MT |
154 | /* event to be sent to guest */ |
155 | struct virtio_scsi_event event; | |
156 | /* event list, serviced from vhost worker thread */ | |
157 | struct llist_node list; | |
158 | }; | |
057cbf49 | 159 | |
101998f6 NB |
160 | enum { |
161 | VHOST_SCSI_VQ_CTL = 0, | |
162 | VHOST_SCSI_VQ_EVT = 1, | |
163 | VHOST_SCSI_VQ_IO = 2, | |
164 | }; | |
165 | ||
e72fd72e | 166 | /* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */ |
5dade710 | 167 | enum { |
95e7c434 | 168 | VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) | |
664ed90e NB |
169 | (1ULL << VIRTIO_SCSI_F_T10_PI) | |
170 | (1ULL << VIRTIO_F_ANY_LAYOUT) | | |
171 | (1ULL << VIRTIO_F_VERSION_1) | |
5dade710 NB |
172 | }; |
173 | ||
1b7f390e AH |
174 | #define VHOST_SCSI_MAX_TARGET 256 |
175 | #define VHOST_SCSI_MAX_VQ 128 | |
a6c9af87 | 176 | #define VHOST_SCSI_MAX_EVENT 128 |
67e18cf9 | 177 | |
3ab2e420 AH |
178 | struct vhost_scsi_virtqueue { |
179 | struct vhost_virtqueue vq; | |
3dfbff32 MT |
180 | /* |
181 | * Reference counting for inflight reqs, used for flush operation. At | |
182 | * each time, one reference tracks new commands submitted, while we | |
183 | * wait for another one to reach 0. | |
184 | */ | |
f2f0173d | 185 | struct vhost_scsi_inflight inflights[2]; |
3dfbff32 MT |
186 | /* |
187 | * Indicate current inflight in use, protected by vq->mutex. | |
188 | * Writers must also take dev mutex and flush under it. | |
189 | */ | |
f2f0173d | 190 | int inflight_idx; |
3ab2e420 AH |
191 | }; |
192 | ||
057cbf49 | 193 | struct vhost_scsi { |
67e18cf9 | 194 | /* Protected by vhost_scsi->dev.mutex */ |
1a1ff825 | 195 | struct vhost_scsi_tpg **vs_tpg; |
67e18cf9 | 196 | char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
67e18cf9 | 197 | |
057cbf49 | 198 | struct vhost_dev dev; |
3ab2e420 | 199 | struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ]; |
057cbf49 NB |
200 | |
201 | struct vhost_work vs_completion_work; /* cmd completion work item */ | |
9d6064a3 | 202 | struct llist_head vs_completion_list; /* cmd completion queue */ |
a6c9af87 AH |
203 | |
204 | struct vhost_work vs_event_work; /* evt injection work item */ | |
205 | struct llist_head vs_event_list; /* evt injection queue */ | |
206 | ||
207 | bool vs_events_missed; /* any missed events, protected by vq->mutex */ | |
208 | int vs_events_nr; /* num of pending events, protected by vq->mutex */ | |
057cbf49 NB |
209 | }; |
210 | ||
1a1ff825 | 211 | static struct workqueue_struct *vhost_scsi_workqueue; |
057cbf49 | 212 | |
1a1ff825 NB |
213 | /* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */ |
214 | static DEFINE_MUTEX(vhost_scsi_mutex); | |
215 | static LIST_HEAD(vhost_scsi_list); | |
057cbf49 | 216 | |
b4078b5f | 217 | static int iov_num_pages(void __user *iov_base, size_t iov_len) |
765b34fd | 218 | { |
b4078b5f NB |
219 | return (PAGE_ALIGN((unsigned long)iov_base + iov_len) - |
220 | ((unsigned long)iov_base & PAGE_MASK)) >> PAGE_SHIFT; | |
765b34fd AH |
221 | } |
222 | ||
1a1ff825 | 223 | static void vhost_scsi_done_inflight(struct kref *kref) |
f2f0173d AH |
224 | { |
225 | struct vhost_scsi_inflight *inflight; | |
226 | ||
227 | inflight = container_of(kref, struct vhost_scsi_inflight, kref); | |
228 | complete(&inflight->comp); | |
229 | } | |
230 | ||
1a1ff825 | 231 | static void vhost_scsi_init_inflight(struct vhost_scsi *vs, |
f2f0173d AH |
232 | struct vhost_scsi_inflight *old_inflight[]) |
233 | { | |
234 | struct vhost_scsi_inflight *new_inflight; | |
235 | struct vhost_virtqueue *vq; | |
236 | int idx, i; | |
237 | ||
238 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
239 | vq = &vs->vqs[i].vq; | |
240 | ||
241 | mutex_lock(&vq->mutex); | |
242 | ||
243 | /* store old infight */ | |
244 | idx = vs->vqs[i].inflight_idx; | |
245 | if (old_inflight) | |
246 | old_inflight[i] = &vs->vqs[i].inflights[idx]; | |
247 | ||
248 | /* setup new infight */ | |
249 | vs->vqs[i].inflight_idx = idx ^ 1; | |
250 | new_inflight = &vs->vqs[i].inflights[idx ^ 1]; | |
251 | kref_init(&new_inflight->kref); | |
252 | init_completion(&new_inflight->comp); | |
253 | ||
254 | mutex_unlock(&vq->mutex); | |
255 | } | |
256 | } | |
257 | ||
258 | static struct vhost_scsi_inflight * | |
1a1ff825 | 259 | vhost_scsi_get_inflight(struct vhost_virtqueue *vq) |
f2f0173d AH |
260 | { |
261 | struct vhost_scsi_inflight *inflight; | |
262 | struct vhost_scsi_virtqueue *svq; | |
263 | ||
264 | svq = container_of(vq, struct vhost_scsi_virtqueue, vq); | |
265 | inflight = &svq->inflights[svq->inflight_idx]; | |
266 | kref_get(&inflight->kref); | |
267 | ||
268 | return inflight; | |
269 | } | |
270 | ||
1a1ff825 | 271 | static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight) |
f2f0173d | 272 | { |
1a1ff825 | 273 | kref_put(&inflight->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
274 | } |
275 | ||
1a1ff825 | 276 | static int vhost_scsi_check_true(struct se_portal_group *se_tpg) |
057cbf49 NB |
277 | { |
278 | return 1; | |
279 | } | |
280 | ||
1a1ff825 | 281 | static int vhost_scsi_check_false(struct se_portal_group *se_tpg) |
057cbf49 NB |
282 | { |
283 | return 0; | |
284 | } | |
285 | ||
1a1ff825 | 286 | static char *vhost_scsi_get_fabric_name(void) |
057cbf49 NB |
287 | { |
288 | return "vhost"; | |
289 | } | |
290 | ||
1a1ff825 | 291 | static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg) |
057cbf49 | 292 | { |
1a1ff825 NB |
293 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
294 | struct vhost_scsi_tpg, se_tpg); | |
295 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
296 | |
297 | return &tport->tport_name[0]; | |
298 | } | |
299 | ||
1a1ff825 | 300 | static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg) |
057cbf49 | 301 | { |
1a1ff825 NB |
302 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
303 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 NB |
304 | return tpg->tport_tpgt; |
305 | } | |
306 | ||
b1d75fe5 NB |
307 | static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg) |
308 | { | |
309 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, | |
310 | struct vhost_scsi_tpg, se_tpg); | |
311 | ||
312 | return tpg->tv_fabric_prot_type; | |
313 | } | |
314 | ||
1a1ff825 | 315 | static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg) |
057cbf49 NB |
316 | { |
317 | return 1; | |
318 | } | |
319 | ||
1a1ff825 | 320 | static void vhost_scsi_release_cmd(struct se_cmd *se_cmd) |
057cbf49 | 321 | { |
1a1ff825 NB |
322 | struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd, |
323 | struct vhost_scsi_cmd, tvc_se_cmd); | |
de1419e4 | 324 | struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess; |
e31885dd | 325 | int i; |
084ed45b NB |
326 | |
327 | if (tv_cmd->tvc_sgl_count) { | |
084ed45b NB |
328 | for (i = 0; i < tv_cmd->tvc_sgl_count; i++) |
329 | put_page(sg_page(&tv_cmd->tvc_sgl[i])); | |
d3d665a6 | 330 | } |
e31885dd NB |
331 | if (tv_cmd->tvc_prot_sgl_count) { |
332 | for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++) | |
333 | put_page(sg_page(&tv_cmd->tvc_prot_sgl[i])); | |
334 | } | |
084ed45b | 335 | |
1a1ff825 | 336 | vhost_scsi_put_inflight(tv_cmd->inflight); |
4824d3bf | 337 | percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag); |
057cbf49 NB |
338 | } |
339 | ||
1a1ff825 | 340 | static int vhost_scsi_shutdown_session(struct se_session *se_sess) |
057cbf49 NB |
341 | { |
342 | return 0; | |
343 | } | |
344 | ||
1a1ff825 | 345 | static void vhost_scsi_close_session(struct se_session *se_sess) |
057cbf49 NB |
346 | { |
347 | return; | |
348 | } | |
349 | ||
1a1ff825 | 350 | static u32 vhost_scsi_sess_get_index(struct se_session *se_sess) |
057cbf49 NB |
351 | { |
352 | return 0; | |
353 | } | |
354 | ||
1a1ff825 | 355 | static int vhost_scsi_write_pending(struct se_cmd *se_cmd) |
057cbf49 NB |
356 | { |
357 | /* Go ahead and process the write immediately */ | |
358 | target_execute_cmd(se_cmd); | |
359 | return 0; | |
360 | } | |
361 | ||
1a1ff825 | 362 | static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd) |
057cbf49 NB |
363 | { |
364 | return 0; | |
365 | } | |
366 | ||
1a1ff825 | 367 | static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl) |
057cbf49 NB |
368 | { |
369 | return; | |
370 | } | |
371 | ||
1a1ff825 | 372 | static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd) |
057cbf49 NB |
373 | { |
374 | return 0; | |
375 | } | |
376 | ||
1a1ff825 | 377 | static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd) |
101998f6 | 378 | { |
3c63f66a | 379 | struct vhost_scsi *vs = cmd->tvc_vhost; |
101998f6 | 380 | |
3c63f66a | 381 | llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
101998f6 NB |
382 | |
383 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
384 | } | |
057cbf49 | 385 | |
1a1ff825 | 386 | static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd) |
057cbf49 | 387 | { |
1a1ff825 NB |
388 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
389 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 390 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
391 | return 0; |
392 | } | |
393 | ||
1a1ff825 | 394 | static int vhost_scsi_queue_status(struct se_cmd *se_cmd) |
057cbf49 | 395 | { |
1a1ff825 NB |
396 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
397 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 398 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
399 | return 0; |
400 | } | |
401 | ||
1a1ff825 | 402 | static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd) |
057cbf49 | 403 | { |
b79fafac | 404 | return; |
057cbf49 NB |
405 | } |
406 | ||
1a1ff825 | 407 | static void vhost_scsi_aborted_task(struct se_cmd *se_cmd) |
131e6abc NB |
408 | { |
409 | return; | |
410 | } | |
411 | ||
1a1ff825 | 412 | static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 AH |
413 | { |
414 | vs->vs_events_nr--; | |
415 | kfree(evt); | |
416 | } | |
417 | ||
1a1ff825 NB |
418 | static struct vhost_scsi_evt * |
419 | vhost_scsi_allocate_evt(struct vhost_scsi *vs, | |
683bd967 | 420 | u32 event, u32 reason) |
a6c9af87 | 421 | { |
3ab2e420 | 422 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
1a1ff825 | 423 | struct vhost_scsi_evt *evt; |
a6c9af87 AH |
424 | |
425 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
426 | vs->vs_events_missed = true; | |
427 | return NULL; | |
428 | } | |
429 | ||
430 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
431 | if (!evt) { | |
1a1ff825 | 432 | vq_err(vq, "Failed to allocate vhost_scsi_evt\n"); |
a6c9af87 AH |
433 | vs->vs_events_missed = true; |
434 | return NULL; | |
435 | } | |
436 | ||
e72fd72e MT |
437 | evt->event.event = cpu_to_vhost32(vq, event); |
438 | evt->event.reason = cpu_to_vhost32(vq, reason); | |
a6c9af87 AH |
439 | vs->vs_events_nr++; |
440 | ||
441 | return evt; | |
442 | } | |
443 | ||
1a1ff825 | 444 | static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd) |
057cbf49 | 445 | { |
3c63f66a | 446 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
447 | |
448 | /* TODO locking against target/backend threads? */ | |
6c131d0c | 449 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 450 | |
084ed45b | 451 | } |
f2f0173d | 452 | |
084ed45b NB |
453 | static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) |
454 | { | |
afc16604 | 455 | return target_put_sess_cmd(se_cmd); |
057cbf49 NB |
456 | } |
457 | ||
683bd967 | 458 | static void |
1a1ff825 | 459 | vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 | 460 | { |
3ab2e420 | 461 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
462 | struct virtio_scsi_event *event = &evt->event; |
463 | struct virtio_scsi_event __user *eventp; | |
464 | unsigned out, in; | |
465 | int head, ret; | |
466 | ||
467 | if (!vq->private_data) { | |
468 | vs->vs_events_missed = true; | |
469 | return; | |
470 | } | |
471 | ||
472 | again: | |
473 | vhost_disable_notify(&vs->dev, vq); | |
47283bef | 474 | head = vhost_get_vq_desc(vq, vq->iov, |
a6c9af87 AH |
475 | ARRAY_SIZE(vq->iov), &out, &in, |
476 | NULL, NULL); | |
477 | if (head < 0) { | |
478 | vs->vs_events_missed = true; | |
479 | return; | |
480 | } | |
481 | if (head == vq->num) { | |
482 | if (vhost_enable_notify(&vs->dev, vq)) | |
483 | goto again; | |
484 | vs->vs_events_missed = true; | |
485 | return; | |
486 | } | |
487 | ||
488 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { | |
489 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", | |
490 | vq->iov[out].iov_len); | |
491 | vs->vs_events_missed = true; | |
492 | return; | |
493 | } | |
494 | ||
495 | if (vs->vs_events_missed) { | |
e72fd72e | 496 | event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED); |
a6c9af87 AH |
497 | vs->vs_events_missed = false; |
498 | } | |
499 | ||
500 | eventp = vq->iov[out].iov_base; | |
501 | ret = __copy_to_user(eventp, event, sizeof(*event)); | |
502 | if (!ret) | |
503 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
504 | else | |
1a1ff825 | 505 | vq_err(vq, "Faulted on vhost_scsi_send_event\n"); |
a6c9af87 AH |
506 | } |
507 | ||
1a1ff825 | 508 | static void vhost_scsi_evt_work(struct vhost_work *work) |
a6c9af87 AH |
509 | { |
510 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
511 | vs_event_work); | |
3ab2e420 | 512 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
1a1ff825 | 513 | struct vhost_scsi_evt *evt; |
a6c9af87 AH |
514 | struct llist_node *llnode; |
515 | ||
516 | mutex_lock(&vq->mutex); | |
517 | llnode = llist_del_all(&vs->vs_event_list); | |
518 | while (llnode) { | |
1a1ff825 | 519 | evt = llist_entry(llnode, struct vhost_scsi_evt, list); |
a6c9af87 | 520 | llnode = llist_next(llnode); |
1a1ff825 NB |
521 | vhost_scsi_do_evt_work(vs, evt); |
522 | vhost_scsi_free_evt(vs, evt); | |
a6c9af87 AH |
523 | } |
524 | mutex_unlock(&vq->mutex); | |
525 | } | |
526 | ||
057cbf49 NB |
527 | /* Fill in status and signal that we are done processing this command |
528 | * | |
529 | * This is scheduled in the vhost work queue so we are called with the owner | |
530 | * process mm and can access the vring. | |
531 | */ | |
532 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) | |
533 | { | |
534 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
535 | vs_completion_work); | |
1b7f390e | 536 | DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 537 | struct virtio_scsi_cmd_resp v_rsp; |
1a1ff825 | 538 | struct vhost_scsi_cmd *cmd; |
9d6064a3 AH |
539 | struct llist_node *llnode; |
540 | struct se_cmd *se_cmd; | |
79c14141 | 541 | struct iov_iter iov_iter; |
1b7f390e | 542 | int ret, vq; |
057cbf49 | 543 | |
1b7f390e | 544 | bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 AH |
545 | llnode = llist_del_all(&vs->vs_completion_list); |
546 | while (llnode) { | |
1a1ff825 | 547 | cmd = llist_entry(llnode, struct vhost_scsi_cmd, |
9d6064a3 AH |
548 | tvc_completion_list); |
549 | llnode = llist_next(llnode); | |
3c63f66a | 550 | se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
551 | |
552 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
3c63f66a | 553 | cmd, se_cmd->residual_count, se_cmd->scsi_status); |
057cbf49 NB |
554 | |
555 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
e72fd72e | 556 | v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count); |
057cbf49 NB |
557 | /* TODO is status_qualifier field needed? */ |
558 | v_rsp.status = se_cmd->scsi_status; | |
e72fd72e MT |
559 | v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq, |
560 | se_cmd->scsi_sense_length); | |
3c63f66a | 561 | memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
e72fd72e | 562 | se_cmd->scsi_sense_length); |
79c14141 NB |
563 | |
564 | iov_iter_init(&iov_iter, READ, cmd->tvc_resp_iov, | |
565 | cmd->tvc_in_iovs, sizeof(v_rsp)); | |
566 | ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter); | |
567 | if (likely(ret == sizeof(v_rsp))) { | |
3ab2e420 | 568 | struct vhost_scsi_virtqueue *q; |
3c63f66a AH |
569 | vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
570 | q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); | |
3ab2e420 | 571 | vq = q - vs->vqs; |
1b7f390e AH |
572 | __set_bit(vq, signal); |
573 | } else | |
057cbf49 NB |
574 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
575 | ||
3c63f66a | 576 | vhost_scsi_free_cmd(cmd); |
057cbf49 NB |
577 | } |
578 | ||
1b7f390e AH |
579 | vq = -1; |
580 | while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) | |
581 | < VHOST_SCSI_MAX_VQ) | |
3ab2e420 | 582 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
583 | } |
584 | ||
1a1ff825 NB |
585 | static struct vhost_scsi_cmd * |
586 | vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg, | |
95e7c434 NB |
587 | unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr, |
588 | u32 exp_data_len, int data_direction) | |
057cbf49 | 589 | { |
1a1ff825 NB |
590 | struct vhost_scsi_cmd *cmd; |
591 | struct vhost_scsi_nexus *tv_nexus; | |
4824d3bf | 592 | struct se_session *se_sess; |
b1935f68 | 593 | struct scatterlist *sg, *prot_sg; |
3aee26b4 | 594 | struct page **pages; |
4824d3bf | 595 | int tag; |
057cbf49 | 596 | |
98718312 | 597 | tv_nexus = tpg->tpg_nexus; |
057cbf49 | 598 | if (!tv_nexus) { |
1a1ff825 | 599 | pr_err("Unable to locate active struct vhost_scsi_nexus\n"); |
057cbf49 NB |
600 | return ERR_PTR(-EIO); |
601 | } | |
4824d3bf | 602 | se_sess = tv_nexus->tvn_se_sess; |
057cbf49 | 603 | |
6f6b5d1e | 604 | tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING); |
4a47d3a1 | 605 | if (tag < 0) { |
1a1ff825 | 606 | pr_err("Unable to obtain tag for vhost_scsi_cmd\n"); |
4a47d3a1 NB |
607 | return ERR_PTR(-ENOMEM); |
608 | } | |
609 | ||
1a1ff825 | 610 | cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag]; |
3aee26b4 | 611 | sg = cmd->tvc_sgl; |
b1935f68 | 612 | prot_sg = cmd->tvc_prot_sgl; |
3aee26b4 | 613 | pages = cmd->tvc_upages; |
1a1ff825 | 614 | memset(cmd, 0, sizeof(struct vhost_scsi_cmd)); |
4824d3bf | 615 | |
3aee26b4 | 616 | cmd->tvc_sgl = sg; |
b1935f68 | 617 | cmd->tvc_prot_sgl = prot_sg; |
3aee26b4 | 618 | cmd->tvc_upages = pages; |
4824d3bf | 619 | cmd->tvc_se_cmd.map_tag = tag; |
95e7c434 NB |
620 | cmd->tvc_tag = scsi_tag; |
621 | cmd->tvc_lun = lun; | |
622 | cmd->tvc_task_attr = task_attr; | |
3c63f66a AH |
623 | cmd->tvc_exp_data_len = exp_data_len; |
624 | cmd->tvc_data_direction = data_direction; | |
625 | cmd->tvc_nexus = tv_nexus; | |
1a1ff825 | 626 | cmd->inflight = vhost_scsi_get_inflight(vq); |
3c63f66a | 627 | |
1a1ff825 | 628 | memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE); |
95e7c434 | 629 | |
3c63f66a | 630 | return cmd; |
057cbf49 NB |
631 | } |
632 | ||
633 | /* | |
634 | * Map a user memory range into a scatterlist | |
635 | * | |
636 | * Returns the number of scatterlist entries used or -errno on error. | |
637 | */ | |
683bd967 | 638 | static int |
1a1ff825 | 639 | vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd, |
b4078b5f NB |
640 | void __user *ptr, |
641 | size_t len, | |
3aee26b4 | 642 | struct scatterlist *sgl, |
5a01d082 | 643 | bool write) |
057cbf49 | 644 | { |
b4078b5f NB |
645 | unsigned int npages = 0, offset, nbytes; |
646 | unsigned int pages_nr = iov_num_pages(ptr, len); | |
057cbf49 | 647 | struct scatterlist *sg = sgl; |
b4078b5f | 648 | struct page **pages = cmd->tvc_upages; |
1810053e | 649 | int ret, i; |
057cbf49 | 650 | |
1a1ff825 | 651 | if (pages_nr > VHOST_SCSI_PREALLOC_UPAGES) { |
3aee26b4 | 652 | pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than" |
1a1ff825 NB |
653 | " preallocated VHOST_SCSI_PREALLOC_UPAGES: %u\n", |
654 | pages_nr, VHOST_SCSI_PREALLOC_UPAGES); | |
3aee26b4 NB |
655 | return -ENOBUFS; |
656 | } | |
657 | ||
1810053e AH |
658 | ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages); |
659 | /* No pages were pinned */ | |
660 | if (ret < 0) | |
661 | goto out; | |
662 | /* Less pages pinned than wanted */ | |
663 | if (ret != pages_nr) { | |
664 | for (i = 0; i < ret; i++) | |
665 | put_page(pages[i]); | |
666 | ret = -EFAULT; | |
667 | goto out; | |
668 | } | |
669 | ||
670 | while (len > 0) { | |
671 | offset = (uintptr_t)ptr & ~PAGE_MASK; | |
672 | nbytes = min_t(unsigned int, PAGE_SIZE - offset, len); | |
673 | sg_set_page(sg, pages[npages], nbytes, offset); | |
057cbf49 NB |
674 | ptr += nbytes; |
675 | len -= nbytes; | |
676 | sg++; | |
677 | npages++; | |
678 | } | |
057cbf49 | 679 | |
1810053e | 680 | out: |
057cbf49 NB |
681 | return ret; |
682 | } | |
683 | ||
683bd967 | 684 | static int |
e8de56b5 | 685 | vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls) |
057cbf49 | 686 | { |
e8de56b5 | 687 | int sgl_count = 0; |
057cbf49 | 688 | |
e8de56b5 NB |
689 | if (!iter || !iter->iov) { |
690 | pr_err("%s: iter->iov is NULL, but expected bytes: %zu" | |
691 | " present\n", __func__, bytes); | |
692 | return -EINVAL; | |
693 | } | |
f3158f36 | 694 | |
e8de56b5 NB |
695 | sgl_count = iov_iter_npages(iter, 0xffff); |
696 | if (sgl_count > max_sgls) { | |
697 | pr_err("%s: requested sgl_count: %d exceeds pre-allocated" | |
698 | " max_sgls: %d\n", __func__, sgl_count, max_sgls); | |
699 | return -EINVAL; | |
5a01d082 | 700 | } |
e8de56b5 NB |
701 | return sgl_count; |
702 | } | |
057cbf49 | 703 | |
e8de56b5 | 704 | static int |
1a1ff825 NB |
705 | vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write, |
706 | struct iov_iter *iter, | |
707 | struct scatterlist *sg, int sg_count) | |
e8de56b5 NB |
708 | { |
709 | size_t off = iter->iov_offset; | |
710 | int i, ret; | |
057cbf49 | 711 | |
e8de56b5 NB |
712 | for (i = 0; i < iter->nr_segs; i++) { |
713 | void __user *base = iter->iov[i].iov_base + off; | |
714 | size_t len = iter->iov[i].iov_len - off; | |
5a01d082 | 715 | |
e8de56b5 | 716 | ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write); |
057cbf49 | 717 | if (ret < 0) { |
e8de56b5 NB |
718 | for (i = 0; i < sg_count; i++) { |
719 | struct page *page = sg_page(&sg[i]); | |
720 | if (page) | |
721 | put_page(page); | |
722 | } | |
057cbf49 NB |
723 | return ret; |
724 | } | |
057cbf49 | 725 | sg += ret; |
e8de56b5 | 726 | off = 0; |
057cbf49 NB |
727 | } |
728 | return 0; | |
729 | } | |
730 | ||
e31885dd | 731 | static int |
1a1ff825 | 732 | vhost_scsi_mapal(struct vhost_scsi_cmd *cmd, |
e8de56b5 NB |
733 | size_t prot_bytes, struct iov_iter *prot_iter, |
734 | size_t data_bytes, struct iov_iter *data_iter) | |
735 | { | |
736 | int sgl_count, ret; | |
737 | bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE); | |
738 | ||
739 | if (prot_bytes) { | |
740 | sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes, | |
1a1ff825 | 741 | VHOST_SCSI_PREALLOC_PROT_SGLS); |
e8de56b5 NB |
742 | if (sgl_count < 0) |
743 | return sgl_count; | |
744 | ||
745 | sg_init_table(cmd->tvc_prot_sgl, sgl_count); | |
746 | cmd->tvc_prot_sgl_count = sgl_count; | |
747 | pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__, | |
748 | cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count); | |
749 | ||
750 | ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter, | |
751 | cmd->tvc_prot_sgl, | |
752 | cmd->tvc_prot_sgl_count); | |
e31885dd | 753 | if (ret < 0) { |
e31885dd NB |
754 | cmd->tvc_prot_sgl_count = 0; |
755 | return ret; | |
756 | } | |
e8de56b5 NB |
757 | } |
758 | sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes, | |
1a1ff825 | 759 | VHOST_SCSI_PREALLOC_SGLS); |
e8de56b5 NB |
760 | if (sgl_count < 0) |
761 | return sgl_count; | |
762 | ||
763 | sg_init_table(cmd->tvc_sgl, sgl_count); | |
764 | cmd->tvc_sgl_count = sgl_count; | |
765 | pr_debug("%s data_sg %p data_sgl_count %u\n", __func__, | |
766 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
767 | ||
768 | ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter, | |
769 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
770 | if (ret < 0) { | |
771 | cmd->tvc_sgl_count = 0; | |
772 | return ret; | |
e31885dd NB |
773 | } |
774 | return 0; | |
775 | } | |
776 | ||
46243860 NB |
777 | static int vhost_scsi_to_tcm_attr(int attr) |
778 | { | |
779 | switch (attr) { | |
780 | case VIRTIO_SCSI_S_SIMPLE: | |
781 | return TCM_SIMPLE_TAG; | |
782 | case VIRTIO_SCSI_S_ORDERED: | |
783 | return TCM_ORDERED_TAG; | |
784 | case VIRTIO_SCSI_S_HEAD: | |
785 | return TCM_HEAD_TAG; | |
786 | case VIRTIO_SCSI_S_ACA: | |
787 | return TCM_ACA_TAG; | |
788 | default: | |
789 | break; | |
790 | } | |
791 | return TCM_SIMPLE_TAG; | |
792 | } | |
793 | ||
1a1ff825 | 794 | static void vhost_scsi_submission_work(struct work_struct *work) |
057cbf49 | 795 | { |
1a1ff825 NB |
796 | struct vhost_scsi_cmd *cmd = |
797 | container_of(work, struct vhost_scsi_cmd, work); | |
798 | struct vhost_scsi_nexus *tv_nexus; | |
3c63f66a | 799 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
95e7c434 NB |
800 | struct scatterlist *sg_ptr, *sg_prot_ptr = NULL; |
801 | int rc; | |
057cbf49 | 802 | |
95e7c434 | 803 | /* FIXME: BIDI operation */ |
3c63f66a AH |
804 | if (cmd->tvc_sgl_count) { |
805 | sg_ptr = cmd->tvc_sgl; | |
95e7c434 NB |
806 | |
807 | if (cmd->tvc_prot_sgl_count) | |
808 | sg_prot_ptr = cmd->tvc_prot_sgl; | |
809 | else | |
810 | se_cmd->prot_pto = true; | |
057cbf49 NB |
811 | } else { |
812 | sg_ptr = NULL; | |
813 | } | |
3c63f66a | 814 | tv_nexus = cmd->tvc_nexus; |
9f0abc15 | 815 | |
649ee054 | 816 | se_cmd->tag = 0; |
9f0abc15 | 817 | rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, |
3c63f66a AH |
818 | cmd->tvc_cdb, &cmd->tvc_sense_buf[0], |
819 | cmd->tvc_lun, cmd->tvc_exp_data_len, | |
46243860 NB |
820 | vhost_scsi_to_tcm_attr(cmd->tvc_task_attr), |
821 | cmd->tvc_data_direction, TARGET_SCF_ACK_KREF, | |
822 | sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr, | |
823 | cmd->tvc_prot_sgl_count); | |
057cbf49 NB |
824 | if (rc < 0) { |
825 | transport_send_check_condition_and_sense(se_cmd, | |
9f0abc15 | 826 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
057cbf49 | 827 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 828 | } |
057cbf49 NB |
829 | } |
830 | ||
683bd967 AH |
831 | static void |
832 | vhost_scsi_send_bad_target(struct vhost_scsi *vs, | |
833 | struct vhost_virtqueue *vq, | |
834 | int head, unsigned out) | |
637ab21e AH |
835 | { |
836 | struct virtio_scsi_cmd_resp __user *resp; | |
837 | struct virtio_scsi_cmd_resp rsp; | |
838 | int ret; | |
839 | ||
840 | memset(&rsp, 0, sizeof(rsp)); | |
841 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
842 | resp = vq->iov[out].iov_base; | |
843 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
844 | if (!ret) | |
845 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
846 | else | |
847 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
848 | } | |
849 | ||
683bd967 AH |
850 | static void |
851 | vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
057cbf49 | 852 | { |
1a1ff825 | 853 | struct vhost_scsi_tpg **vs_tpg, *tpg; |
057cbf49 | 854 | struct virtio_scsi_cmd_req v_req; |
95e7c434 | 855 | struct virtio_scsi_cmd_req_pi v_req_pi; |
1a1ff825 | 856 | struct vhost_scsi_cmd *cmd; |
09b13fa8 | 857 | struct iov_iter out_iter, in_iter, prot_iter, data_iter; |
95e7c434 | 858 | u64 tag; |
09b13fa8 NB |
859 | u32 exp_data_len, data_direction; |
860 | unsigned out, in; | |
861 | int head, ret, prot_bytes; | |
862 | size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp); | |
863 | size_t out_size, in_size; | |
95e7c434 NB |
864 | u16 lun; |
865 | u8 *target, *lunp, task_attr; | |
09b13fa8 | 866 | bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI); |
95e7c434 | 867 | void *req, *cdb; |
057cbf49 | 868 | |
e7802212 | 869 | mutex_lock(&vq->mutex); |
4f7f46d3 AH |
870 | /* |
871 | * We can handle the vq only after the endpoint is setup by calling the | |
872 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
4f7f46d3 | 873 | */ |
e7802212 | 874 | vs_tpg = vq->private_data; |
4f7f46d3 | 875 | if (!vs_tpg) |
e7802212 | 876 | goto out; |
057cbf49 | 877 | |
057cbf49 NB |
878 | vhost_disable_notify(&vs->dev, vq); |
879 | ||
880 | for (;;) { | |
47283bef | 881 | head = vhost_get_vq_desc(vq, vq->iov, |
09b13fa8 NB |
882 | ARRAY_SIZE(vq->iov), &out, &in, |
883 | NULL, NULL); | |
057cbf49 | 884 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", |
09b13fa8 | 885 | head, out, in); |
057cbf49 NB |
886 | /* On error, stop handling until the next kick. */ |
887 | if (unlikely(head < 0)) | |
888 | break; | |
889 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
890 | if (head == vq->num) { | |
891 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
892 | vhost_disable_notify(&vs->dev, vq); | |
893 | continue; | |
894 | } | |
895 | break; | |
896 | } | |
057cbf49 | 897 | /* |
09b13fa8 NB |
898 | * Check for a sane response buffer so we can report early |
899 | * errors back to the guest. | |
057cbf49 | 900 | */ |
09b13fa8 NB |
901 | if (unlikely(vq->iov[out].iov_len < rsp_size)) { |
902 | vq_err(vq, "Expecting at least virtio_scsi_cmd_resp" | |
903 | " size, got %zu bytes\n", vq->iov[out].iov_len); | |
057cbf49 NB |
904 | break; |
905 | } | |
09b13fa8 NB |
906 | /* |
907 | * Setup pointers and values based upon different virtio-scsi | |
908 | * request header if T10_PI is enabled in KVM guest. | |
909 | */ | |
910 | if (t10_pi) { | |
95e7c434 | 911 | req = &v_req_pi; |
09b13fa8 | 912 | req_size = sizeof(v_req_pi); |
95e7c434 NB |
913 | lunp = &v_req_pi.lun[0]; |
914 | target = &v_req_pi.lun[1]; | |
95e7c434 NB |
915 | } else { |
916 | req = &v_req; | |
09b13fa8 | 917 | req_size = sizeof(v_req); |
95e7c434 NB |
918 | lunp = &v_req.lun[0]; |
919 | target = &v_req.lun[1]; | |
95e7c434 | 920 | } |
09b13fa8 NB |
921 | /* |
922 | * FIXME: Not correct for BIDI operation | |
923 | */ | |
924 | out_size = iov_length(vq->iov, out); | |
925 | in_size = iov_length(&vq->iov[out], in); | |
95e7c434 | 926 | |
09b13fa8 NB |
927 | /* |
928 | * Copy over the virtio-scsi request header, which for a | |
929 | * ANY_LAYOUT enabled guest may span multiple iovecs, or a | |
930 | * single iovec may contain both the header + outgoing | |
931 | * WRITE payloads. | |
932 | * | |
933 | * copy_from_iter() will advance out_iter, so that it will | |
934 | * point at the start of the outgoing WRITE payload, if | |
935 | * DMA_TO_DEVICE is set. | |
936 | */ | |
937 | iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size); | |
057cbf49 | 938 | |
09b13fa8 NB |
939 | ret = copy_from_iter(req, req_size, &out_iter); |
940 | if (unlikely(ret != req_size)) { | |
941 | vq_err(vq, "Faulted on copy_from_iter\n"); | |
de1419e4 NB |
942 | vhost_scsi_send_bad_target(vs, vq, head, out); |
943 | continue; | |
057cbf49 | 944 | } |
7fe412d0 | 945 | /* virtio-scsi spec requires byte 0 of the lun to be 1 */ |
95e7c434 | 946 | if (unlikely(*lunp != 1)) { |
09b13fa8 | 947 | vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp); |
7fe412d0 VS |
948 | vhost_scsi_send_bad_target(vs, vq, head, out); |
949 | continue; | |
950 | } | |
951 | ||
95e7c434 | 952 | tpg = ACCESS_ONCE(vs_tpg[*target]); |
98718312 | 953 | if (unlikely(!tpg)) { |
09b13fa8 | 954 | /* Target does not exist, fail the request */ |
637ab21e | 955 | vhost_scsi_send_bad_target(vs, vq, head, out); |
67e18cf9 AH |
956 | continue; |
957 | } | |
95e7c434 | 958 | /* |
09b13fa8 NB |
959 | * Determine data_direction by calculating the total outgoing |
960 | * iovec sizes + incoming iovec sizes vs. virtio-scsi request + | |
961 | * response headers respectively. | |
95e7c434 | 962 | * |
09b13fa8 NB |
963 | * For DMA_TO_DEVICE this is out_iter, which is already pointing |
964 | * to the right place. | |
965 | * | |
966 | * For DMA_FROM_DEVICE, the iovec will be just past the end | |
967 | * of the virtio-scsi response header in either the same | |
968 | * or immediately following iovec. | |
95e7c434 | 969 | * |
09b13fa8 NB |
970 | * Any associated T10_PI bytes for the outgoing / incoming |
971 | * payloads are included in calculation of exp_data_len here. | |
95e7c434 | 972 | */ |
09b13fa8 NB |
973 | prot_bytes = 0; |
974 | ||
975 | if (out_size > req_size) { | |
976 | data_direction = DMA_TO_DEVICE; | |
977 | exp_data_len = out_size - req_size; | |
978 | data_iter = out_iter; | |
979 | } else if (in_size > rsp_size) { | |
980 | data_direction = DMA_FROM_DEVICE; | |
981 | exp_data_len = in_size - rsp_size; | |
982 | ||
983 | iov_iter_init(&in_iter, READ, &vq->iov[out], in, | |
984 | rsp_size + exp_data_len); | |
985 | iov_iter_advance(&in_iter, rsp_size); | |
986 | data_iter = in_iter; | |
987 | } else { | |
988 | data_direction = DMA_NONE; | |
989 | exp_data_len = 0; | |
990 | } | |
991 | /* | |
992 | * If T10_PI header + payload is present, setup prot_iter values | |
993 | * and recalculate data_iter for vhost_scsi_mapal() mapping to | |
994 | * host scatterlists via get_user_pages_fast(). | |
95e7c434 | 995 | */ |
09b13fa8 | 996 | if (t10_pi) { |
95e7c434 NB |
997 | if (v_req_pi.pi_bytesout) { |
998 | if (data_direction != DMA_TO_DEVICE) { | |
09b13fa8 NB |
999 | vq_err(vq, "Received non zero pi_bytesout," |
1000 | " but wrong data_direction\n"); | |
de1419e4 NB |
1001 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1002 | continue; | |
95e7c434 | 1003 | } |
e72fd72e | 1004 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout); |
95e7c434 NB |
1005 | } else if (v_req_pi.pi_bytesin) { |
1006 | if (data_direction != DMA_FROM_DEVICE) { | |
09b13fa8 NB |
1007 | vq_err(vq, "Received non zero pi_bytesin," |
1008 | " but wrong data_direction\n"); | |
de1419e4 NB |
1009 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1010 | continue; | |
95e7c434 | 1011 | } |
e72fd72e | 1012 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin); |
95e7c434 | 1013 | } |
09b13fa8 NB |
1014 | /* |
1015 | * Set prot_iter to data_iter, and advance past any | |
1016 | * preceeding prot_bytes that may be present. | |
1017 | * | |
1018 | * Also fix up the exp_data_len to reflect only the | |
1019 | * actual data payload length. | |
1020 | */ | |
95e7c434 | 1021 | if (prot_bytes) { |
09b13fa8 NB |
1022 | exp_data_len -= prot_bytes; |
1023 | prot_iter = data_iter; | |
1024 | iov_iter_advance(&data_iter, prot_bytes); | |
95e7c434 | 1025 | } |
e72fd72e | 1026 | tag = vhost64_to_cpu(vq, v_req_pi.tag); |
95e7c434 NB |
1027 | task_attr = v_req_pi.task_attr; |
1028 | cdb = &v_req_pi.cdb[0]; | |
1029 | lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF; | |
1030 | } else { | |
e72fd72e | 1031 | tag = vhost64_to_cpu(vq, v_req.tag); |
95e7c434 NB |
1032 | task_attr = v_req.task_attr; |
1033 | cdb = &v_req.cdb[0]; | |
1034 | lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; | |
1035 | } | |
95e7c434 | 1036 | /* |
09b13fa8 NB |
1037 | * Check that the received CDB size does not exceeded our |
1038 | * hardcoded max for vhost-scsi, then get a pre-allocated | |
1039 | * cmd descriptor for the new virtio-scsi tag. | |
95e7c434 NB |
1040 | * |
1041 | * TODO what if cdb was too small for varlen cdb header? | |
1042 | */ | |
1a1ff825 | 1043 | if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) { |
95e7c434 NB |
1044 | vq_err(vq, "Received SCSI CDB with command_size: %d that" |
1045 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
1a1ff825 | 1046 | scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE); |
de1419e4 NB |
1047 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1048 | continue; | |
95e7c434 | 1049 | } |
95e7c434 | 1050 | cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr, |
9f977ef7 NB |
1051 | exp_data_len + prot_bytes, |
1052 | data_direction); | |
3c63f66a | 1053 | if (IS_ERR(cmd)) { |
4824d3bf | 1054 | vq_err(vq, "vhost_scsi_get_tag failed %ld\n", |
09b13fa8 | 1055 | PTR_ERR(cmd)); |
de1419e4 NB |
1056 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1057 | continue; | |
057cbf49 | 1058 | } |
3c63f66a AH |
1059 | cmd->tvc_vhost = vs; |
1060 | cmd->tvc_vq = vq; | |
79c14141 NB |
1061 | cmd->tvc_resp_iov = &vq->iov[out]; |
1062 | cmd->tvc_in_iovs = in; | |
057cbf49 | 1063 | |
057cbf49 | 1064 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", |
09b13fa8 NB |
1065 | cmd->tvc_cdb[0], cmd->tvc_lun); |
1066 | pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:" | |
1067 | " %d\n", cmd, exp_data_len, prot_bytes, data_direction); | |
057cbf49 NB |
1068 | |
1069 | if (data_direction != DMA_NONE) { | |
09b13fa8 NB |
1070 | ret = vhost_scsi_mapal(cmd, |
1071 | prot_bytes, &prot_iter, | |
1072 | exp_data_len, &data_iter); | |
057cbf49 NB |
1073 | if (unlikely(ret)) { |
1074 | vq_err(vq, "Failed to map iov to sgl\n"); | |
1a1ff825 | 1075 | vhost_scsi_release_cmd(&cmd->tvc_se_cmd); |
de1419e4 NB |
1076 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1077 | continue; | |
057cbf49 NB |
1078 | } |
1079 | } | |
057cbf49 NB |
1080 | /* |
1081 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
1082 | * complete the virtio-scsi request in TCM callback context via | |
09b13fa8 | 1083 | * vhost_scsi_queue_data_in() and vhost_scsi_queue_status() |
057cbf49 | 1084 | */ |
3c63f66a | 1085 | cmd->tvc_vq_desc = head; |
057cbf49 | 1086 | /* |
09b13fa8 NB |
1087 | * Dispatch cmd descriptor for cmwq execution in process |
1088 | * context provided by vhost_scsi_workqueue. This also ensures | |
1089 | * cmd is executed on the same kworker CPU as this vhost | |
1090 | * thread to gain positive L2 cache locality effects. | |
057cbf49 | 1091 | */ |
1a1ff825 NB |
1092 | INIT_WORK(&cmd->work, vhost_scsi_submission_work); |
1093 | queue_work(vhost_scsi_workqueue, &cmd->work); | |
057cbf49 | 1094 | } |
e7802212 | 1095 | out: |
7ea206cf | 1096 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
1097 | } |
1098 | ||
1099 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) | |
1100 | { | |
101998f6 | 1101 | pr_debug("%s: The handling func for control queue.\n", __func__); |
057cbf49 NB |
1102 | } |
1103 | ||
683bd967 | 1104 | static void |
1a1ff825 NB |
1105 | vhost_scsi_send_evt(struct vhost_scsi *vs, |
1106 | struct vhost_scsi_tpg *tpg, | |
683bd967 AH |
1107 | struct se_lun *lun, |
1108 | u32 event, | |
1109 | u32 reason) | |
a6c9af87 | 1110 | { |
1a1ff825 | 1111 | struct vhost_scsi_evt *evt; |
a6c9af87 | 1112 | |
1a1ff825 | 1113 | evt = vhost_scsi_allocate_evt(vs, event, reason); |
a6c9af87 AH |
1114 | if (!evt) |
1115 | return; | |
1116 | ||
1117 | if (tpg && lun) { | |
1118 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
1119 | /* | |
1120 | * Note: evt->event is zeroed when we allocate it and | |
1121 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
1122 | */ | |
1123 | evt->event.lun[0] = 0x01; | |
59c816c1 | 1124 | evt->event.lun[1] = tpg->tport_tpgt; |
a6c9af87 AH |
1125 | if (lun->unpacked_lun >= 256) |
1126 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
1127 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
1128 | } | |
1129 | ||
1130 | llist_add(&evt->list, &vs->vs_event_list); | |
1131 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
1132 | } | |
1133 | ||
057cbf49 NB |
1134 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
1135 | { | |
a6c9af87 AH |
1136 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1137 | poll.work); | |
1138 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1139 | ||
1140 | mutex_lock(&vq->mutex); | |
1141 | if (!vq->private_data) | |
1142 | goto out; | |
1143 | ||
1144 | if (vs->vs_events_missed) | |
1a1ff825 | 1145 | vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); |
a6c9af87 AH |
1146 | out: |
1147 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
1148 | } |
1149 | ||
1150 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
1151 | { | |
1152 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
1153 | poll.work); | |
1154 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1155 | ||
1b7f390e | 1156 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
1157 | } |
1158 | ||
4f7f46d3 AH |
1159 | static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
1160 | { | |
3ab2e420 | 1161 | vhost_poll_flush(&vs->vqs[index].vq.poll); |
4f7f46d3 AH |
1162 | } |
1163 | ||
3dfbff32 | 1164 | /* Callers must hold dev mutex */ |
4f7f46d3 AH |
1165 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
1166 | { | |
f2f0173d | 1167 | struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; |
4f7f46d3 AH |
1168 | int i; |
1169 | ||
f2f0173d | 1170 | /* Init new inflight and remember the old inflight */ |
1a1ff825 | 1171 | vhost_scsi_init_inflight(vs, old_inflight); |
f2f0173d AH |
1172 | |
1173 | /* | |
1174 | * The inflight->kref was initialized to 1. We decrement it here to | |
1175 | * indicate the start of the flush operation so that it will reach 0 | |
1176 | * when all the reqs are finished. | |
1177 | */ | |
1178 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1a1ff825 | 1179 | kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
1180 | |
1181 | /* Flush both the vhost poll and vhost work */ | |
4f7f46d3 AH |
1182 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
1183 | vhost_scsi_flush_vq(vs, i); | |
1184 | vhost_work_flush(&vs->dev, &vs->vs_completion_work); | |
a6c9af87 | 1185 | vhost_work_flush(&vs->dev, &vs->vs_event_work); |
f2f0173d AH |
1186 | |
1187 | /* Wait for all reqs issued before the flush to be finished */ | |
1188 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1189 | wait_for_completion(&old_inflight[i]->comp); | |
4f7f46d3 AH |
1190 | } |
1191 | ||
057cbf49 NB |
1192 | /* |
1193 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
1a1ff825 | 1194 | * vhost_scsi_tpg with an active struct vhost_scsi_nexus |
f2b7daf5 AH |
1195 | * |
1196 | * The lock nesting rule is: | |
1a1ff825 | 1197 | * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex |
057cbf49 | 1198 | */ |
683bd967 AH |
1199 | static int |
1200 | vhost_scsi_set_endpoint(struct vhost_scsi *vs, | |
1201 | struct vhost_scsi_target *t) | |
057cbf49 | 1202 | { |
ab8edab1 | 1203 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1204 | struct vhost_scsi_tport *tv_tport; |
1205 | struct vhost_scsi_tpg *tpg; | |
1206 | struct vhost_scsi_tpg **vs_tpg; | |
4f7f46d3 AH |
1207 | struct vhost_virtqueue *vq; |
1208 | int index, ret, i, len; | |
67e18cf9 | 1209 | bool match = false; |
057cbf49 | 1210 | |
1a1ff825 | 1211 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 1212 | mutex_lock(&vs->dev.mutex); |
f2b7daf5 | 1213 | |
057cbf49 NB |
1214 | /* Verify that ring has been setup correctly. */ |
1215 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
1216 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 1217 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
1218 | ret = -EFAULT; |
1219 | goto out; | |
057cbf49 NB |
1220 | } |
1221 | } | |
057cbf49 | 1222 | |
4f7f46d3 AH |
1223 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
1224 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
1225 | if (!vs_tpg) { | |
f2b7daf5 AH |
1226 | ret = -ENOMEM; |
1227 | goto out; | |
4f7f46d3 AH |
1228 | } |
1229 | if (vs->vs_tpg) | |
1230 | memcpy(vs_tpg, vs->vs_tpg, len); | |
1231 | ||
1a1ff825 | 1232 | list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) { |
98718312 AH |
1233 | mutex_lock(&tpg->tv_tpg_mutex); |
1234 | if (!tpg->tpg_nexus) { | |
1235 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1236 | continue; |
1237 | } | |
98718312 AH |
1238 | if (tpg->tv_tpg_vhost_count != 0) { |
1239 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1240 | continue; |
1241 | } | |
98718312 | 1242 | tv_tport = tpg->tport; |
057cbf49 | 1243 | |
67e18cf9 | 1244 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
98718312 | 1245 | if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
4f7f46d3 | 1246 | kfree(vs_tpg); |
98718312 | 1247 | mutex_unlock(&tpg->tv_tpg_mutex); |
f2b7daf5 AH |
1248 | ret = -EEXIST; |
1249 | goto out; | |
101998f6 | 1250 | } |
ab8edab1 NB |
1251 | /* |
1252 | * In order to ensure individual vhost-scsi configfs | |
1253 | * groups cannot be removed while in use by vhost ioctl, | |
1254 | * go ahead and take an explicit se_tpg->tpg_group.cg_item | |
1255 | * dependency now. | |
1256 | */ | |
1257 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1258 | ret = target_depend_item(&se_tpg->tpg_group.cg_item); |
ab8edab1 NB |
1259 | if (ret) { |
1260 | pr_warn("configfs_depend_item() failed: %d\n", ret); | |
1261 | kfree(vs_tpg); | |
1262 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1263 | goto out; | |
1264 | } | |
98718312 AH |
1265 | tpg->tv_tpg_vhost_count++; |
1266 | tpg->vhost_scsi = vs; | |
1267 | vs_tpg[tpg->tport_tpgt] = tpg; | |
4e857c58 | 1268 | smp_mb__after_atomic(); |
67e18cf9 | 1269 | match = true; |
057cbf49 | 1270 | } |
98718312 | 1271 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1272 | } |
67e18cf9 AH |
1273 | |
1274 | if (match) { | |
1275 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1276 | sizeof(vs->vs_vhost_wwpn)); | |
4f7f46d3 | 1277 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
3ab2e420 | 1278 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1279 | mutex_lock(&vq->mutex); |
22fa90c7 | 1280 | vq->private_data = vs_tpg; |
dfd5d569 | 1281 | vhost_init_used(vq); |
4f7f46d3 AH |
1282 | mutex_unlock(&vq->mutex); |
1283 | } | |
67e18cf9 AH |
1284 | ret = 0; |
1285 | } else { | |
1286 | ret = -EEXIST; | |
1287 | } | |
1288 | ||
4f7f46d3 AH |
1289 | /* |
1290 | * Act as synchronize_rcu to make sure access to | |
1291 | * old vs->vs_tpg is finished. | |
1292 | */ | |
1293 | vhost_scsi_flush(vs); | |
1294 | kfree(vs->vs_tpg); | |
1295 | vs->vs_tpg = vs_tpg; | |
1296 | ||
f2b7daf5 | 1297 | out: |
67e18cf9 | 1298 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1299 | mutex_unlock(&vhost_scsi_mutex); |
67e18cf9 | 1300 | return ret; |
057cbf49 NB |
1301 | } |
1302 | ||
683bd967 AH |
1303 | static int |
1304 | vhost_scsi_clear_endpoint(struct vhost_scsi *vs, | |
1305 | struct vhost_scsi_target *t) | |
057cbf49 | 1306 | { |
ab8edab1 | 1307 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1308 | struct vhost_scsi_tport *tv_tport; |
1309 | struct vhost_scsi_tpg *tpg; | |
4f7f46d3 AH |
1310 | struct vhost_virtqueue *vq; |
1311 | bool match = false; | |
67e18cf9 AH |
1312 | int index, ret, i; |
1313 | u8 target; | |
057cbf49 | 1314 | |
1a1ff825 | 1315 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 NB |
1316 | mutex_lock(&vs->dev.mutex); |
1317 | /* Verify that ring has been setup correctly. */ | |
1318 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1319 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1320 | ret = -EFAULT; |
038e0af4 | 1321 | goto err_dev; |
057cbf49 NB |
1322 | } |
1323 | } | |
4f7f46d3 AH |
1324 | |
1325 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1326 | ret = 0; |
1327 | goto err_dev; | |
4f7f46d3 AH |
1328 | } |
1329 | ||
67e18cf9 AH |
1330 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1331 | target = i; | |
98718312 AH |
1332 | tpg = vs->vs_tpg[target]; |
1333 | if (!tpg) | |
67e18cf9 AH |
1334 | continue; |
1335 | ||
98718312 AH |
1336 | mutex_lock(&tpg->tv_tpg_mutex); |
1337 | tv_tport = tpg->tport; | |
67e18cf9 AH |
1338 | if (!tv_tport) { |
1339 | ret = -ENODEV; | |
038e0af4 | 1340 | goto err_tpg; |
67e18cf9 AH |
1341 | } |
1342 | ||
1343 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
98718312 | 1344 | pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" |
67e18cf9 | 1345 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", |
98718312 | 1346 | tv_tport->tport_name, tpg->tport_tpgt, |
67e18cf9 AH |
1347 | t->vhost_wwpn, t->vhost_tpgt); |
1348 | ret = -EINVAL; | |
038e0af4 | 1349 | goto err_tpg; |
67e18cf9 | 1350 | } |
98718312 AH |
1351 | tpg->tv_tpg_vhost_count--; |
1352 | tpg->vhost_scsi = NULL; | |
67e18cf9 | 1353 | vs->vs_tpg[target] = NULL; |
4f7f46d3 | 1354 | match = true; |
98718312 | 1355 | mutex_unlock(&tpg->tv_tpg_mutex); |
ab8edab1 NB |
1356 | /* |
1357 | * Release se_tpg->tpg_group.cg_item configfs dependency now | |
1358 | * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur. | |
1359 | */ | |
1360 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1361 | target_undepend_item(&se_tpg->tpg_group.cg_item); |
057cbf49 | 1362 | } |
4f7f46d3 AH |
1363 | if (match) { |
1364 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
3ab2e420 | 1365 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1366 | mutex_lock(&vq->mutex); |
22fa90c7 | 1367 | vq->private_data = NULL; |
4f7f46d3 AH |
1368 | mutex_unlock(&vq->mutex); |
1369 | } | |
1370 | } | |
1371 | /* | |
1372 | * Act as synchronize_rcu to make sure access to | |
1373 | * old vs->vs_tpg is finished. | |
1374 | */ | |
1375 | vhost_scsi_flush(vs); | |
1376 | kfree(vs->vs_tpg); | |
1377 | vs->vs_tpg = NULL; | |
a6c9af87 | 1378 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1379 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1380 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 1381 | return 0; |
101998f6 | 1382 | |
038e0af4 | 1383 | err_tpg: |
98718312 | 1384 | mutex_unlock(&tpg->tv_tpg_mutex); |
038e0af4 | 1385 | err_dev: |
101998f6 | 1386 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1387 | mutex_unlock(&vhost_scsi_mutex); |
101998f6 | 1388 | return ret; |
057cbf49 NB |
1389 | } |
1390 | ||
4f7f46d3 AH |
1391 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1392 | { | |
ea16c514 MT |
1393 | struct vhost_virtqueue *vq; |
1394 | int i; | |
1395 | ||
4f7f46d3 AH |
1396 | if (features & ~VHOST_SCSI_FEATURES) |
1397 | return -EOPNOTSUPP; | |
1398 | ||
1399 | mutex_lock(&vs->dev.mutex); | |
1400 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1401 | !vhost_log_access_ok(&vs->dev)) { | |
1402 | mutex_unlock(&vs->dev.mutex); | |
1403 | return -EFAULT; | |
1404 | } | |
ea16c514 MT |
1405 | |
1406 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
1407 | vq = &vs->vqs[i].vq; | |
1408 | mutex_lock(&vq->mutex); | |
1409 | vq->acked_features = features; | |
1410 | mutex_unlock(&vq->mutex); | |
1411 | } | |
4f7f46d3 AH |
1412 | mutex_unlock(&vs->dev.mutex); |
1413 | return 0; | |
1414 | } | |
1415 | ||
057cbf49 NB |
1416 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1417 | { | |
c7289312 | 1418 | struct vhost_scsi *vs; |
3ab2e420 | 1419 | struct vhost_virtqueue **vqs; |
595cb754 | 1420 | int r = -ENOMEM, i; |
057cbf49 | 1421 | |
595cb754 MT |
1422 | vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
1423 | if (!vs) { | |
1424 | vs = vzalloc(sizeof(*vs)); | |
1425 | if (!vs) | |
1426 | goto err_vs; | |
1427 | } | |
057cbf49 | 1428 | |
3ab2e420 | 1429 | vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL); |
595cb754 MT |
1430 | if (!vqs) |
1431 | goto err_vqs; | |
3ab2e420 | 1432 | |
c7289312 | 1433 | vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); |
1a1ff825 | 1434 | vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work); |
a6c9af87 | 1435 | |
c7289312 AH |
1436 | vs->vs_events_nr = 0; |
1437 | vs->vs_events_missed = false; | |
057cbf49 | 1438 | |
c7289312 AH |
1439 | vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; |
1440 | vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1441 | vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1442 | vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
3ab2e420 | 1443 | for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { |
c7289312 AH |
1444 | vqs[i] = &vs->vqs[i].vq; |
1445 | vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
3ab2e420 | 1446 | } |
59566b6e | 1447 | vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ); |
f2f0173d | 1448 | |
1a1ff825 | 1449 | vhost_scsi_init_inflight(vs, NULL); |
f2f0173d | 1450 | |
c7289312 | 1451 | f->private_data = vs; |
057cbf49 | 1452 | return 0; |
595cb754 | 1453 | |
595cb754 | 1454 | err_vqs: |
68404441 | 1455 | kvfree(vs); |
595cb754 MT |
1456 | err_vs: |
1457 | return r; | |
057cbf49 NB |
1458 | } |
1459 | ||
1460 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1461 | { | |
c7289312 | 1462 | struct vhost_scsi *vs = f->private_data; |
67e18cf9 | 1463 | struct vhost_scsi_target t; |
057cbf49 | 1464 | |
c7289312 AH |
1465 | mutex_lock(&vs->dev.mutex); |
1466 | memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1467 | mutex_unlock(&vs->dev.mutex); | |
1468 | vhost_scsi_clear_endpoint(vs, &t); | |
1469 | vhost_dev_stop(&vs->dev); | |
1470 | vhost_dev_cleanup(&vs->dev, false); | |
a6c9af87 | 1471 | /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
c7289312 AH |
1472 | vhost_scsi_flush(vs); |
1473 | kfree(vs->dev.vqs); | |
68404441 | 1474 | kvfree(vs); |
057cbf49 NB |
1475 | return 0; |
1476 | } | |
1477 | ||
683bd967 AH |
1478 | static long |
1479 | vhost_scsi_ioctl(struct file *f, | |
1480 | unsigned int ioctl, | |
1481 | unsigned long arg) | |
057cbf49 NB |
1482 | { |
1483 | struct vhost_scsi *vs = f->private_data; | |
1484 | struct vhost_scsi_target backend; | |
1485 | void __user *argp = (void __user *)arg; | |
1486 | u64 __user *featurep = argp; | |
11c63418 AH |
1487 | u32 __user *eventsp = argp; |
1488 | u32 events_missed; | |
057cbf49 | 1489 | u64 features; |
101998f6 | 1490 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1491 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1492 | |
1493 | switch (ioctl) { | |
1494 | case VHOST_SCSI_SET_ENDPOINT: | |
1495 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1496 | return -EFAULT; | |
6de7145c MT |
1497 | if (backend.reserved != 0) |
1498 | return -EOPNOTSUPP; | |
057cbf49 NB |
1499 | |
1500 | return vhost_scsi_set_endpoint(vs, &backend); | |
1501 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1502 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1503 | return -EFAULT; | |
6de7145c MT |
1504 | if (backend.reserved != 0) |
1505 | return -EOPNOTSUPP; | |
057cbf49 NB |
1506 | |
1507 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1508 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1509 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1510 | return -EFAULT; |
1511 | return 0; | |
11c63418 AH |
1512 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1513 | if (get_user(events_missed, eventsp)) | |
1514 | return -EFAULT; | |
1515 | mutex_lock(&vq->mutex); | |
1516 | vs->vs_events_missed = events_missed; | |
1517 | mutex_unlock(&vq->mutex); | |
1518 | return 0; | |
1519 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1520 | mutex_lock(&vq->mutex); | |
1521 | events_missed = vs->vs_events_missed; | |
1522 | mutex_unlock(&vq->mutex); | |
1523 | if (put_user(events_missed, eventsp)) | |
1524 | return -EFAULT; | |
1525 | return 0; | |
057cbf49 | 1526 | case VHOST_GET_FEATURES: |
5dade710 | 1527 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1528 | if (copy_to_user(featurep, &features, sizeof features)) |
1529 | return -EFAULT; | |
1530 | return 0; | |
1531 | case VHOST_SET_FEATURES: | |
1532 | if (copy_from_user(&features, featurep, sizeof features)) | |
1533 | return -EFAULT; | |
1534 | return vhost_scsi_set_features(vs, features); | |
1535 | default: | |
1536 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1537 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1538 | /* TODO: flush backend after dev ioctl. */ | |
1539 | if (r == -ENOIOCTLCMD) | |
1540 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1541 | mutex_unlock(&vs->dev.mutex); |
1542 | return r; | |
1543 | } | |
1544 | } | |
1545 | ||
101998f6 NB |
1546 | #ifdef CONFIG_COMPAT |
1547 | static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, | |
1548 | unsigned long arg) | |
1549 | { | |
1550 | return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1551 | } | |
1552 | #endif | |
1553 | ||
057cbf49 NB |
1554 | static const struct file_operations vhost_scsi_fops = { |
1555 | .owner = THIS_MODULE, | |
1556 | .release = vhost_scsi_release, | |
1557 | .unlocked_ioctl = vhost_scsi_ioctl, | |
101998f6 NB |
1558 | #ifdef CONFIG_COMPAT |
1559 | .compat_ioctl = vhost_scsi_compat_ioctl, | |
1560 | #endif | |
057cbf49 NB |
1561 | .open = vhost_scsi_open, |
1562 | .llseek = noop_llseek, | |
1563 | }; | |
1564 | ||
1565 | static struct miscdevice vhost_scsi_misc = { | |
1566 | MISC_DYNAMIC_MINOR, | |
1567 | "vhost-scsi", | |
1568 | &vhost_scsi_fops, | |
1569 | }; | |
1570 | ||
1571 | static int __init vhost_scsi_register(void) | |
1572 | { | |
1573 | return misc_register(&vhost_scsi_misc); | |
1574 | } | |
1575 | ||
1576 | static int vhost_scsi_deregister(void) | |
1577 | { | |
1578 | return misc_deregister(&vhost_scsi_misc); | |
1579 | } | |
1580 | ||
1a1ff825 | 1581 | static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport) |
057cbf49 NB |
1582 | { |
1583 | switch (tport->tport_proto_id) { | |
1584 | case SCSI_PROTOCOL_SAS: | |
1585 | return "SAS"; | |
1586 | case SCSI_PROTOCOL_FCP: | |
1587 | return "FCP"; | |
1588 | case SCSI_PROTOCOL_ISCSI: | |
1589 | return "iSCSI"; | |
1590 | default: | |
1591 | break; | |
1592 | } | |
1593 | ||
1594 | return "Unknown"; | |
1595 | } | |
1596 | ||
683bd967 | 1597 | static void |
1a1ff825 | 1598 | vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg, |
683bd967 | 1599 | struct se_lun *lun, bool plug) |
a6c9af87 AH |
1600 | { |
1601 | ||
1602 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1603 | struct vhost_virtqueue *vq; | |
1604 | u32 reason; | |
1605 | ||
1606 | if (!vs) | |
1607 | return; | |
1608 | ||
1609 | mutex_lock(&vs->dev.mutex); | |
a6c9af87 AH |
1610 | |
1611 | if (plug) | |
1612 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1613 | else | |
1614 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1615 | ||
3ab2e420 | 1616 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 | 1617 | mutex_lock(&vq->mutex); |
ea16c514 | 1618 | if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG)) |
1a1ff825 | 1619 | vhost_scsi_send_evt(vs, tpg, lun, |
ea16c514 | 1620 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); |
a6c9af87 AH |
1621 | mutex_unlock(&vq->mutex); |
1622 | mutex_unlock(&vs->dev.mutex); | |
1623 | } | |
1624 | ||
1a1ff825 | 1625 | static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1626 | { |
1a1ff825 | 1627 | vhost_scsi_do_plug(tpg, lun, true); |
a6c9af87 AH |
1628 | } |
1629 | ||
1a1ff825 | 1630 | static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1631 | { |
1a1ff825 | 1632 | vhost_scsi_do_plug(tpg, lun, false); |
a6c9af87 AH |
1633 | } |
1634 | ||
1a1ff825 | 1635 | static int vhost_scsi_port_link(struct se_portal_group *se_tpg, |
683bd967 | 1636 | struct se_lun *lun) |
057cbf49 | 1637 | { |
1a1ff825 NB |
1638 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1639 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1640 | |
1a1ff825 | 1641 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1642 | |
98718312 AH |
1643 | mutex_lock(&tpg->tv_tpg_mutex); |
1644 | tpg->tv_tpg_port_count++; | |
1645 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 | 1646 | |
1a1ff825 | 1647 | vhost_scsi_hotplug(tpg, lun); |
a6c9af87 | 1648 | |
1a1ff825 | 1649 | mutex_unlock(&vhost_scsi_mutex); |
a6c9af87 | 1650 | |
057cbf49 NB |
1651 | return 0; |
1652 | } | |
1653 | ||
1a1ff825 | 1654 | static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg, |
683bd967 | 1655 | struct se_lun *lun) |
057cbf49 | 1656 | { |
1a1ff825 NB |
1657 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1658 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1659 | |
1a1ff825 | 1660 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1661 | |
98718312 AH |
1662 | mutex_lock(&tpg->tv_tpg_mutex); |
1663 | tpg->tv_tpg_port_count--; | |
1664 | mutex_unlock(&tpg->tv_tpg_mutex); | |
a6c9af87 | 1665 | |
1a1ff825 | 1666 | vhost_scsi_hotunplug(tpg, lun); |
a6c9af87 | 1667 | |
1a1ff825 | 1668 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 NB |
1669 | } |
1670 | ||
1a1ff825 | 1671 | static void vhost_scsi_free_cmd_map_res(struct vhost_scsi_nexus *nexus, |
3aee26b4 NB |
1672 | struct se_session *se_sess) |
1673 | { | |
1a1ff825 | 1674 | struct vhost_scsi_cmd *tv_cmd; |
3aee26b4 NB |
1675 | unsigned int i; |
1676 | ||
1677 | if (!se_sess->sess_cmd_map) | |
1678 | return; | |
1679 | ||
1a1ff825 NB |
1680 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1681 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 NB |
1682 | |
1683 | kfree(tv_cmd->tvc_sgl); | |
b1935f68 | 1684 | kfree(tv_cmd->tvc_prot_sgl); |
3aee26b4 NB |
1685 | kfree(tv_cmd->tvc_upages); |
1686 | } | |
1687 | } | |
1688 | ||
b1d75fe5 NB |
1689 | static ssize_t vhost_scsi_tpg_attrib_store_fabric_prot_type( |
1690 | struct se_portal_group *se_tpg, | |
1691 | const char *page, | |
1692 | size_t count) | |
1693 | { | |
1694 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, | |
1695 | struct vhost_scsi_tpg, se_tpg); | |
1696 | unsigned long val; | |
1697 | int ret = kstrtoul(page, 0, &val); | |
1698 | ||
1699 | if (ret) { | |
1700 | pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); | |
1701 | return ret; | |
1702 | } | |
1703 | if (val != 0 && val != 1 && val != 3) { | |
1704 | pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val); | |
1705 | return -EINVAL; | |
1706 | } | |
1707 | tpg->tv_fabric_prot_type = val; | |
1708 | ||
1709 | return count; | |
1710 | } | |
1711 | ||
1712 | static ssize_t vhost_scsi_tpg_attrib_show_fabric_prot_type( | |
1713 | struct se_portal_group *se_tpg, | |
1714 | char *page) | |
1715 | { | |
1716 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, | |
1717 | struct vhost_scsi_tpg, se_tpg); | |
1718 | ||
1719 | return sprintf(page, "%d\n", tpg->tv_fabric_prot_type); | |
1720 | } | |
1721 | TF_TPG_ATTRIB_ATTR(vhost_scsi, fabric_prot_type, S_IRUGO | S_IWUSR); | |
1722 | ||
1723 | static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = { | |
1724 | &vhost_scsi_tpg_attrib_fabric_prot_type.attr, | |
1725 | NULL, | |
1726 | }; | |
1727 | ||
1a1ff825 | 1728 | static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg, |
683bd967 | 1729 | const char *name) |
057cbf49 NB |
1730 | { |
1731 | struct se_portal_group *se_tpg; | |
3aee26b4 | 1732 | struct se_session *se_sess; |
1a1ff825 NB |
1733 | struct vhost_scsi_nexus *tv_nexus; |
1734 | struct vhost_scsi_cmd *tv_cmd; | |
3aee26b4 | 1735 | unsigned int i; |
057cbf49 | 1736 | |
98718312 AH |
1737 | mutex_lock(&tpg->tv_tpg_mutex); |
1738 | if (tpg->tpg_nexus) { | |
1739 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1740 | pr_debug("tpg->tpg_nexus already exists\n"); | |
057cbf49 NB |
1741 | return -EEXIST; |
1742 | } | |
98718312 | 1743 | se_tpg = &tpg->se_tpg; |
057cbf49 | 1744 | |
1a1ff825 | 1745 | tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL); |
057cbf49 | 1746 | if (!tv_nexus) { |
98718312 | 1747 | mutex_unlock(&tpg->tv_tpg_mutex); |
1a1ff825 | 1748 | pr_err("Unable to allocate struct vhost_scsi_nexus\n"); |
057cbf49 NB |
1749 | return -ENOMEM; |
1750 | } | |
1751 | /* | |
4824d3bf | 1752 | * Initialize the struct se_session pointer and setup tagpool |
1a1ff825 | 1753 | * for struct vhost_scsi_cmd descriptors |
057cbf49 | 1754 | */ |
4824d3bf | 1755 | tv_nexus->tvn_se_sess = transport_init_session_tags( |
1a1ff825 NB |
1756 | VHOST_SCSI_DEFAULT_TAGS, |
1757 | sizeof(struct vhost_scsi_cmd), | |
95e7c434 | 1758 | TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS); |
057cbf49 | 1759 | if (IS_ERR(tv_nexus->tvn_se_sess)) { |
98718312 | 1760 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1761 | kfree(tv_nexus); |
1762 | return -ENOMEM; | |
1763 | } | |
3aee26b4 | 1764 | se_sess = tv_nexus->tvn_se_sess; |
1a1ff825 NB |
1765 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1766 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 NB |
1767 | |
1768 | tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) * | |
1a1ff825 | 1769 | VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL); |
3aee26b4 NB |
1770 | if (!tv_cmd->tvc_sgl) { |
1771 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1772 | pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); | |
1773 | goto out; | |
1774 | } | |
1775 | ||
1776 | tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) * | |
1a1ff825 | 1777 | VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL); |
3aee26b4 NB |
1778 | if (!tv_cmd->tvc_upages) { |
1779 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1780 | pr_err("Unable to allocate tv_cmd->tvc_upages\n"); | |
1781 | goto out; | |
1782 | } | |
b1935f68 NB |
1783 | |
1784 | tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) * | |
1a1ff825 | 1785 | VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL); |
b1935f68 NB |
1786 | if (!tv_cmd->tvc_prot_sgl) { |
1787 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1788 | pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); | |
1789 | goto out; | |
1790 | } | |
3aee26b4 | 1791 | } |
057cbf49 NB |
1792 | /* |
1793 | * Since we are running in 'demo mode' this call with generate a | |
1a1ff825 | 1794 | * struct se_node_acl for the vhost_scsi struct se_portal_group with |
057cbf49 NB |
1795 | * the SCSI Initiator port name of the passed configfs group 'name'. |
1796 | */ | |
1797 | tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
1798 | se_tpg, (unsigned char *)name); | |
1799 | if (!tv_nexus->tvn_se_sess->se_node_acl) { | |
98718312 | 1800 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1801 | pr_debug("core_tpg_check_initiator_node_acl() failed" |
1802 | " for %s\n", name); | |
3aee26b4 | 1803 | goto out; |
057cbf49 NB |
1804 | } |
1805 | /* | |
2f450cc1 | 1806 | * Now register the TCM vhost virtual I_T Nexus as active. |
057cbf49 | 1807 | */ |
2f450cc1 | 1808 | transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl, |
057cbf49 | 1809 | tv_nexus->tvn_se_sess, tv_nexus); |
98718312 | 1810 | tpg->tpg_nexus = tv_nexus; |
057cbf49 | 1811 | |
98718312 | 1812 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1813 | return 0; |
3aee26b4 NB |
1814 | |
1815 | out: | |
1a1ff825 | 1816 | vhost_scsi_free_cmd_map_res(tv_nexus, se_sess); |
3aee26b4 NB |
1817 | transport_free_session(se_sess); |
1818 | kfree(tv_nexus); | |
1819 | return -ENOMEM; | |
057cbf49 NB |
1820 | } |
1821 | ||
1a1ff825 | 1822 | static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg) |
057cbf49 NB |
1823 | { |
1824 | struct se_session *se_sess; | |
1a1ff825 | 1825 | struct vhost_scsi_nexus *tv_nexus; |
057cbf49 NB |
1826 | |
1827 | mutex_lock(&tpg->tv_tpg_mutex); | |
1828 | tv_nexus = tpg->tpg_nexus; | |
1829 | if (!tv_nexus) { | |
1830 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1831 | return -ENODEV; | |
1832 | } | |
1833 | ||
1834 | se_sess = tv_nexus->tvn_se_sess; | |
1835 | if (!se_sess) { | |
1836 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1837 | return -ENODEV; | |
1838 | } | |
1839 | ||
101998f6 | 1840 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 1841 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1842 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1843 | " active TPG port count: %d\n", |
101998f6 NB |
1844 | tpg->tv_tpg_port_count); |
1845 | return -EBUSY; | |
057cbf49 NB |
1846 | } |
1847 | ||
101998f6 | 1848 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 1849 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1850 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1851 | " active TPG vhost count: %d\n", |
101998f6 NB |
1852 | tpg->tv_tpg_vhost_count); |
1853 | return -EBUSY; | |
057cbf49 NB |
1854 | } |
1855 | ||
101998f6 | 1856 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
1a1ff825 | 1857 | " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport), |
057cbf49 | 1858 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
3aee26b4 | 1859 | |
1a1ff825 | 1860 | vhost_scsi_free_cmd_map_res(tv_nexus, se_sess); |
057cbf49 | 1861 | /* |
101998f6 | 1862 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 NB |
1863 | */ |
1864 | transport_deregister_session(tv_nexus->tvn_se_sess); | |
1865 | tpg->tpg_nexus = NULL; | |
1866 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1867 | ||
1868 | kfree(tv_nexus); | |
1869 | return 0; | |
1870 | } | |
1871 | ||
1a1ff825 | 1872 | static ssize_t vhost_scsi_tpg_show_nexus(struct se_portal_group *se_tpg, |
683bd967 | 1873 | char *page) |
057cbf49 | 1874 | { |
1a1ff825 NB |
1875 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1876 | struct vhost_scsi_tpg, se_tpg); | |
1877 | struct vhost_scsi_nexus *tv_nexus; | |
057cbf49 NB |
1878 | ssize_t ret; |
1879 | ||
98718312 AH |
1880 | mutex_lock(&tpg->tv_tpg_mutex); |
1881 | tv_nexus = tpg->tpg_nexus; | |
057cbf49 | 1882 | if (!tv_nexus) { |
98718312 | 1883 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1884 | return -ENODEV; |
1885 | } | |
1886 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1887 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
98718312 | 1888 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1889 | |
1890 | return ret; | |
1891 | } | |
1892 | ||
1a1ff825 | 1893 | static ssize_t vhost_scsi_tpg_store_nexus(struct se_portal_group *se_tpg, |
683bd967 AH |
1894 | const char *page, |
1895 | size_t count) | |
057cbf49 | 1896 | { |
1a1ff825 NB |
1897 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1898 | struct vhost_scsi_tpg, se_tpg); | |
1899 | struct vhost_scsi_tport *tport_wwn = tpg->tport; | |
1900 | unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr; | |
057cbf49 NB |
1901 | int ret; |
1902 | /* | |
1903 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
1904 | */ | |
1905 | if (!strncmp(page, "NULL", 4)) { | |
1a1ff825 | 1906 | ret = vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
1907 | return (!ret) ? count : ret; |
1908 | } | |
1909 | /* | |
1910 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1a1ff825 NB |
1911 | * the fabric protocol_id set in vhost_scsi_make_tport(), and call |
1912 | * vhost_scsi_make_nexus(). | |
057cbf49 | 1913 | */ |
1a1ff825 | 1914 | if (strlen(page) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 1915 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
1a1ff825 | 1916 | " max: %d\n", page, VHOST_SCSI_NAMELEN); |
057cbf49 NB |
1917 | return -EINVAL; |
1918 | } | |
1a1ff825 | 1919 | snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page); |
057cbf49 NB |
1920 | |
1921 | ptr = strstr(i_port, "naa."); | |
1922 | if (ptr) { | |
1923 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
1924 | pr_err("Passed SAS Initiator Port %s does not" | |
1925 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 1926 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
1927 | return -EINVAL; |
1928 | } | |
1929 | port_ptr = &i_port[0]; | |
1930 | goto check_newline; | |
1931 | } | |
1932 | ptr = strstr(i_port, "fc."); | |
1933 | if (ptr) { | |
1934 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
1935 | pr_err("Passed FCP Initiator Port %s does not" | |
1936 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 1937 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
1938 | return -EINVAL; |
1939 | } | |
1940 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1941 | goto check_newline; | |
1942 | } | |
1943 | ptr = strstr(i_port, "iqn."); | |
1944 | if (ptr) { | |
1945 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
1946 | pr_err("Passed iSCSI Initiator Port %s does not" | |
1947 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 1948 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
1949 | return -EINVAL; |
1950 | } | |
1951 | port_ptr = &i_port[0]; | |
1952 | goto check_newline; | |
1953 | } | |
1954 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
1955 | " %s\n", i_port); | |
1956 | return -EINVAL; | |
1957 | /* | |
1958 | * Clear any trailing newline for the NAA WWN | |
1959 | */ | |
1960 | check_newline: | |
1961 | if (i_port[strlen(i_port)-1] == '\n') | |
1962 | i_port[strlen(i_port)-1] = '\0'; | |
1963 | ||
1a1ff825 | 1964 | ret = vhost_scsi_make_nexus(tpg, port_ptr); |
057cbf49 NB |
1965 | if (ret < 0) |
1966 | return ret; | |
1967 | ||
1968 | return count; | |
1969 | } | |
1970 | ||
1a1ff825 | 1971 | TF_TPG_BASE_ATTR(vhost_scsi, nexus, S_IRUGO | S_IWUSR); |
057cbf49 | 1972 | |
1a1ff825 NB |
1973 | static struct configfs_attribute *vhost_scsi_tpg_attrs[] = { |
1974 | &vhost_scsi_tpg_nexus.attr, | |
057cbf49 NB |
1975 | NULL, |
1976 | }; | |
1977 | ||
683bd967 | 1978 | static struct se_portal_group * |
1a1ff825 | 1979 | vhost_scsi_make_tpg(struct se_wwn *wwn, |
683bd967 AH |
1980 | struct config_group *group, |
1981 | const char *name) | |
057cbf49 | 1982 | { |
1a1ff825 NB |
1983 | struct vhost_scsi_tport *tport = container_of(wwn, |
1984 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 | 1985 | |
1a1ff825 | 1986 | struct vhost_scsi_tpg *tpg; |
59c816c1 | 1987 | u16 tpgt; |
057cbf49 NB |
1988 | int ret; |
1989 | ||
1990 | if (strstr(name, "tpgt_") != name) | |
1991 | return ERR_PTR(-EINVAL); | |
59c816c1 | 1992 | if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET) |
057cbf49 NB |
1993 | return ERR_PTR(-EINVAL); |
1994 | ||
1a1ff825 | 1995 | tpg = kzalloc(sizeof(struct vhost_scsi_tpg), GFP_KERNEL); |
057cbf49 | 1996 | if (!tpg) { |
1a1ff825 | 1997 | pr_err("Unable to allocate struct vhost_scsi_tpg"); |
057cbf49 NB |
1998 | return ERR_PTR(-ENOMEM); |
1999 | } | |
2000 | mutex_init(&tpg->tv_tpg_mutex); | |
2001 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
2002 | tpg->tport = tport; | |
2003 | tpg->tport_tpgt = tpgt; | |
2004 | ||
bc0c94b1 | 2005 | ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id); |
057cbf49 NB |
2006 | if (ret < 0) { |
2007 | kfree(tpg); | |
2008 | return NULL; | |
2009 | } | |
1a1ff825 NB |
2010 | mutex_lock(&vhost_scsi_mutex); |
2011 | list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list); | |
2012 | mutex_unlock(&vhost_scsi_mutex); | |
057cbf49 NB |
2013 | |
2014 | return &tpg->se_tpg; | |
2015 | } | |
2016 | ||
1a1ff825 | 2017 | static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg) |
057cbf49 | 2018 | { |
1a1ff825 NB |
2019 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2020 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 2021 | |
1a1ff825 | 2022 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 2023 | list_del(&tpg->tv_tpg_list); |
1a1ff825 | 2024 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 2025 | /* |
101998f6 | 2026 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 | 2027 | */ |
1a1ff825 | 2028 | vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
2029 | /* |
2030 | * Deregister the se_tpg from TCM.. | |
2031 | */ | |
2032 | core_tpg_deregister(se_tpg); | |
2033 | kfree(tpg); | |
2034 | } | |
2035 | ||
683bd967 | 2036 | static struct se_wwn * |
1a1ff825 | 2037 | vhost_scsi_make_tport(struct target_fabric_configfs *tf, |
683bd967 AH |
2038 | struct config_group *group, |
2039 | const char *name) | |
057cbf49 | 2040 | { |
1a1ff825 | 2041 | struct vhost_scsi_tport *tport; |
057cbf49 NB |
2042 | char *ptr; |
2043 | u64 wwpn = 0; | |
2044 | int off = 0; | |
2045 | ||
1a1ff825 | 2046 | /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0) |
057cbf49 NB |
2047 | return ERR_PTR(-EINVAL); */ |
2048 | ||
1a1ff825 | 2049 | tport = kzalloc(sizeof(struct vhost_scsi_tport), GFP_KERNEL); |
057cbf49 | 2050 | if (!tport) { |
1a1ff825 | 2051 | pr_err("Unable to allocate struct vhost_scsi_tport"); |
057cbf49 NB |
2052 | return ERR_PTR(-ENOMEM); |
2053 | } | |
2054 | tport->tport_wwpn = wwpn; | |
2055 | /* | |
2056 | * Determine the emulated Protocol Identifier and Target Port Name | |
2057 | * based on the incoming configfs directory name. | |
2058 | */ | |
2059 | ptr = strstr(name, "naa."); | |
2060 | if (ptr) { | |
2061 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
2062 | goto check_len; | |
2063 | } | |
2064 | ptr = strstr(name, "fc."); | |
2065 | if (ptr) { | |
2066 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
2067 | off = 3; /* Skip over "fc." */ | |
2068 | goto check_len; | |
2069 | } | |
2070 | ptr = strstr(name, "iqn."); | |
2071 | if (ptr) { | |
2072 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
2073 | goto check_len; | |
2074 | } | |
2075 | ||
2076 | pr_err("Unable to locate prefix for emulated Target Port:" | |
2077 | " %s\n", name); | |
2078 | kfree(tport); | |
2079 | return ERR_PTR(-EINVAL); | |
2080 | ||
2081 | check_len: | |
1a1ff825 | 2082 | if (strlen(name) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2083 | pr_err("Emulated %s Address: %s, exceeds" |
1a1ff825 NB |
2084 | " max: %d\n", name, vhost_scsi_dump_proto_id(tport), |
2085 | VHOST_SCSI_NAMELEN); | |
057cbf49 NB |
2086 | kfree(tport); |
2087 | return ERR_PTR(-EINVAL); | |
2088 | } | |
1a1ff825 | 2089 | snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]); |
057cbf49 NB |
2090 | |
2091 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
1a1ff825 | 2092 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name); |
057cbf49 NB |
2093 | |
2094 | return &tport->tport_wwn; | |
2095 | } | |
2096 | ||
1a1ff825 | 2097 | static void vhost_scsi_drop_tport(struct se_wwn *wwn) |
057cbf49 | 2098 | { |
1a1ff825 NB |
2099 | struct vhost_scsi_tport *tport = container_of(wwn, |
2100 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 NB |
2101 | |
2102 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
1a1ff825 | 2103 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), |
057cbf49 NB |
2104 | tport->tport_name); |
2105 | ||
2106 | kfree(tport); | |
2107 | } | |
2108 | ||
683bd967 | 2109 | static ssize_t |
1a1ff825 | 2110 | vhost_scsi_wwn_show_attr_version(struct target_fabric_configfs *tf, |
683bd967 | 2111 | char *page) |
057cbf49 NB |
2112 | { |
2113 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" | |
1a1ff825 | 2114 | "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 NB |
2115 | utsname()->machine); |
2116 | } | |
2117 | ||
1a1ff825 | 2118 | TF_WWN_ATTR_RO(vhost_scsi, version); |
057cbf49 | 2119 | |
1a1ff825 NB |
2120 | static struct configfs_attribute *vhost_scsi_wwn_attrs[] = { |
2121 | &vhost_scsi_wwn_version.attr, | |
057cbf49 NB |
2122 | NULL, |
2123 | }; | |
2124 | ||
1a1ff825 | 2125 | static struct target_core_fabric_ops vhost_scsi_ops = { |
9ac8928e CH |
2126 | .module = THIS_MODULE, |
2127 | .name = "vhost", | |
1a1ff825 | 2128 | .get_fabric_name = vhost_scsi_get_fabric_name, |
1a1ff825 NB |
2129 | .tpg_get_wwn = vhost_scsi_get_fabric_wwn, |
2130 | .tpg_get_tag = vhost_scsi_get_tpgt, | |
1a1ff825 NB |
2131 | .tpg_check_demo_mode = vhost_scsi_check_true, |
2132 | .tpg_check_demo_mode_cache = vhost_scsi_check_true, | |
2133 | .tpg_check_demo_mode_write_protect = vhost_scsi_check_false, | |
2134 | .tpg_check_prod_mode_write_protect = vhost_scsi_check_false, | |
b1d75fe5 | 2135 | .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only, |
1a1ff825 NB |
2136 | .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index, |
2137 | .release_cmd = vhost_scsi_release_cmd, | |
084ed45b | 2138 | .check_stop_free = vhost_scsi_check_stop_free, |
1a1ff825 NB |
2139 | .shutdown_session = vhost_scsi_shutdown_session, |
2140 | .close_session = vhost_scsi_close_session, | |
2141 | .sess_get_index = vhost_scsi_sess_get_index, | |
057cbf49 | 2142 | .sess_get_initiator_sid = NULL, |
1a1ff825 NB |
2143 | .write_pending = vhost_scsi_write_pending, |
2144 | .write_pending_status = vhost_scsi_write_pending_status, | |
2145 | .set_default_node_attributes = vhost_scsi_set_default_node_attrs, | |
1a1ff825 NB |
2146 | .get_cmd_state = vhost_scsi_get_cmd_state, |
2147 | .queue_data_in = vhost_scsi_queue_data_in, | |
2148 | .queue_status = vhost_scsi_queue_status, | |
2149 | .queue_tm_rsp = vhost_scsi_queue_tm_rsp, | |
2150 | .aborted_task = vhost_scsi_aborted_task, | |
057cbf49 NB |
2151 | /* |
2152 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
2153 | */ | |
1a1ff825 NB |
2154 | .fabric_make_wwn = vhost_scsi_make_tport, |
2155 | .fabric_drop_wwn = vhost_scsi_drop_tport, | |
2156 | .fabric_make_tpg = vhost_scsi_make_tpg, | |
2157 | .fabric_drop_tpg = vhost_scsi_drop_tpg, | |
2158 | .fabric_post_link = vhost_scsi_port_link, | |
2159 | .fabric_pre_unlink = vhost_scsi_port_unlink, | |
9ac8928e CH |
2160 | |
2161 | .tfc_wwn_attrs = vhost_scsi_wwn_attrs, | |
2162 | .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs, | |
2163 | .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs, | |
057cbf49 NB |
2164 | }; |
2165 | ||
9ac8928e | 2166 | static int __init vhost_scsi_init(void) |
057cbf49 | 2167 | { |
9ac8928e | 2168 | int ret = -ENOMEM; |
057cbf49 | 2169 | |
9ac8928e | 2170 | pr_debug("TCM_VHOST fabric module %s on %s/%s" |
1a1ff825 | 2171 | " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 | 2172 | utsname()->machine); |
057cbf49 | 2173 | |
101998f6 NB |
2174 | /* |
2175 | * Use our own dedicated workqueue for submitting I/O into | |
2176 | * target core to avoid contention within system_wq. | |
2177 | */ | |
1a1ff825 NB |
2178 | vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0); |
2179 | if (!vhost_scsi_workqueue) | |
057cbf49 NB |
2180 | goto out; |
2181 | ||
2182 | ret = vhost_scsi_register(); | |
2183 | if (ret < 0) | |
2184 | goto out_destroy_workqueue; | |
2185 | ||
9ac8928e | 2186 | ret = target_register_template(&vhost_scsi_ops); |
057cbf49 NB |
2187 | if (ret < 0) |
2188 | goto out_vhost_scsi_deregister; | |
2189 | ||
2190 | return 0; | |
2191 | ||
2192 | out_vhost_scsi_deregister: | |
2193 | vhost_scsi_deregister(); | |
2194 | out_destroy_workqueue: | |
1a1ff825 | 2195 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2196 | out: |
2197 | return ret; | |
2198 | }; | |
2199 | ||
1a1ff825 | 2200 | static void vhost_scsi_exit(void) |
057cbf49 | 2201 | { |
9ac8928e | 2202 | target_unregister_template(&vhost_scsi_ops); |
057cbf49 | 2203 | vhost_scsi_deregister(); |
1a1ff825 | 2204 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2205 | }; |
2206 | ||
181c04a3 MT |
2207 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
2208 | MODULE_ALIAS("tcm_vhost"); | |
057cbf49 | 2209 | MODULE_LICENSE("GPL"); |
1a1ff825 NB |
2210 | module_init(vhost_scsi_init); |
2211 | module_exit(vhost_scsi_exit); |