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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> |
057cbf49 | 49 | |
057cbf49 | 50 | #include "vhost.h" |
5012a3a3 | 51 | |
1a1ff825 NB |
52 | #define VHOST_SCSI_VERSION "v0.1" |
53 | #define VHOST_SCSI_NAMELEN 256 | |
54 | #define VHOST_SCSI_MAX_CDB_SIZE 32 | |
55 | #define VHOST_SCSI_DEFAULT_TAGS 256 | |
56 | #define VHOST_SCSI_PREALLOC_SGLS 2048 | |
57 | #define VHOST_SCSI_PREALLOC_UPAGES 2048 | |
864d39df | 58 | #define VHOST_SCSI_PREALLOC_PROT_SGLS 2048 |
5012a3a3 MT |
59 | |
60 | struct vhost_scsi_inflight { | |
61 | /* Wait for the flush operation to finish */ | |
62 | struct completion comp; | |
63 | /* Refcount for the inflight reqs */ | |
64 | struct kref kref; | |
65 | }; | |
66 | ||
1a1ff825 | 67 | struct vhost_scsi_cmd { |
5012a3a3 MT |
68 | /* Descriptor from vhost_get_vq_desc() for virt_queue segment */ |
69 | int tvc_vq_desc; | |
70 | /* virtio-scsi initiator task attribute */ | |
71 | int tvc_task_attr; | |
79c14141 NB |
72 | /* virtio-scsi response incoming iovecs */ |
73 | int tvc_in_iovs; | |
5012a3a3 MT |
74 | /* virtio-scsi initiator data direction */ |
75 | enum dma_data_direction tvc_data_direction; | |
76 | /* Expected data transfer length from virtio-scsi header */ | |
77 | u32 tvc_exp_data_len; | |
78 | /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */ | |
79 | u64 tvc_tag; | |
80 | /* The number of scatterlists associated with this cmd */ | |
81 | u32 tvc_sgl_count; | |
e31885dd | 82 | u32 tvc_prot_sgl_count; |
1a1ff825 | 83 | /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */ |
5012a3a3 MT |
84 | u32 tvc_lun; |
85 | /* Pointer to the SGL formatted memory from virtio-scsi */ | |
86 | struct scatterlist *tvc_sgl; | |
b1935f68 | 87 | struct scatterlist *tvc_prot_sgl; |
3aee26b4 | 88 | struct page **tvc_upages; |
79c14141 | 89 | /* Pointer to response header iovec */ |
a77ec83a | 90 | struct iovec tvc_resp_iov; |
5012a3a3 MT |
91 | /* Pointer to vhost_scsi for our device */ |
92 | struct vhost_scsi *tvc_vhost; | |
93 | /* Pointer to vhost_virtqueue for the cmd */ | |
94 | struct vhost_virtqueue *tvc_vq; | |
95 | /* Pointer to vhost nexus memory */ | |
1a1ff825 | 96 | struct vhost_scsi_nexus *tvc_nexus; |
5012a3a3 MT |
97 | /* The TCM I/O descriptor that is accessed via container_of() */ |
98 | struct se_cmd tvc_se_cmd; | |
1a1ff825 | 99 | /* work item used for cmwq dispatch to vhost_scsi_submission_work() */ |
5012a3a3 MT |
100 | struct work_struct work; |
101 | /* Copy of the incoming SCSI command descriptor block (CDB) */ | |
1a1ff825 | 102 | unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE]; |
5012a3a3 MT |
103 | /* Sense buffer that will be mapped into outgoing status */ |
104 | unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER]; | |
105 | /* Completed commands list, serviced from vhost worker thread */ | |
106 | struct llist_node tvc_completion_list; | |
107 | /* Used to track inflight cmd */ | |
108 | struct vhost_scsi_inflight *inflight; | |
109 | }; | |
110 | ||
1a1ff825 | 111 | struct vhost_scsi_nexus { |
5012a3a3 MT |
112 | /* Pointer to TCM session for I_T Nexus */ |
113 | struct se_session *tvn_se_sess; | |
114 | }; | |
115 | ||
1a1ff825 | 116 | struct vhost_scsi_tpg { |
5012a3a3 MT |
117 | /* Vhost port target portal group tag for TCM */ |
118 | u16 tport_tpgt; | |
119 | /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */ | |
120 | int tv_tpg_port_count; | |
121 | /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */ | |
122 | int tv_tpg_vhost_count; | |
b1d75fe5 NB |
123 | /* Used for enabling T10-PI with legacy devices */ |
124 | int tv_fabric_prot_type; | |
1a1ff825 | 125 | /* list for vhost_scsi_list */ |
5012a3a3 MT |
126 | struct list_head tv_tpg_list; |
127 | /* Used to protect access for tpg_nexus */ | |
128 | struct mutex tv_tpg_mutex; | |
129 | /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */ | |
1a1ff825 NB |
130 | struct vhost_scsi_nexus *tpg_nexus; |
131 | /* Pointer back to vhost_scsi_tport */ | |
132 | struct vhost_scsi_tport *tport; | |
133 | /* Returned by vhost_scsi_make_tpg() */ | |
5012a3a3 MT |
134 | struct se_portal_group se_tpg; |
135 | /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */ | |
136 | struct vhost_scsi *vhost_scsi; | |
137 | }; | |
138 | ||
1a1ff825 | 139 | struct vhost_scsi_tport { |
5012a3a3 MT |
140 | /* SCSI protocol the tport is providing */ |
141 | u8 tport_proto_id; | |
142 | /* Binary World Wide unique Port Name for Vhost Target port */ | |
143 | u64 tport_wwpn; | |
144 | /* ASCII formatted WWPN for Vhost Target port */ | |
1a1ff825 NB |
145 | char tport_name[VHOST_SCSI_NAMELEN]; |
146 | /* Returned by vhost_scsi_make_tport() */ | |
5012a3a3 MT |
147 | struct se_wwn tport_wwn; |
148 | }; | |
149 | ||
1a1ff825 | 150 | struct vhost_scsi_evt { |
5012a3a3 MT |
151 | /* event to be sent to guest */ |
152 | struct virtio_scsi_event event; | |
153 | /* event list, serviced from vhost worker thread */ | |
154 | struct llist_node list; | |
155 | }; | |
057cbf49 | 156 | |
101998f6 NB |
157 | enum { |
158 | VHOST_SCSI_VQ_CTL = 0, | |
159 | VHOST_SCSI_VQ_EVT = 1, | |
160 | VHOST_SCSI_VQ_IO = 2, | |
161 | }; | |
162 | ||
e72fd72e | 163 | /* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */ |
5dade710 | 164 | enum { |
95e7c434 | 165 | VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) | |
4e9fa50c | 166 | (1ULL << VIRTIO_SCSI_F_T10_PI) |
5dade710 NB |
167 | }; |
168 | ||
1b7f390e AH |
169 | #define VHOST_SCSI_MAX_TARGET 256 |
170 | #define VHOST_SCSI_MAX_VQ 128 | |
a6c9af87 | 171 | #define VHOST_SCSI_MAX_EVENT 128 |
67e18cf9 | 172 | |
3ab2e420 AH |
173 | struct vhost_scsi_virtqueue { |
174 | struct vhost_virtqueue vq; | |
3dfbff32 MT |
175 | /* |
176 | * Reference counting for inflight reqs, used for flush operation. At | |
177 | * each time, one reference tracks new commands submitted, while we | |
178 | * wait for another one to reach 0. | |
179 | */ | |
f2f0173d | 180 | struct vhost_scsi_inflight inflights[2]; |
3dfbff32 MT |
181 | /* |
182 | * Indicate current inflight in use, protected by vq->mutex. | |
183 | * Writers must also take dev mutex and flush under it. | |
184 | */ | |
f2f0173d | 185 | int inflight_idx; |
3ab2e420 AH |
186 | }; |
187 | ||
057cbf49 | 188 | struct vhost_scsi { |
67e18cf9 | 189 | /* Protected by vhost_scsi->dev.mutex */ |
1a1ff825 | 190 | struct vhost_scsi_tpg **vs_tpg; |
67e18cf9 | 191 | char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
67e18cf9 | 192 | |
057cbf49 | 193 | struct vhost_dev dev; |
3ab2e420 | 194 | struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ]; |
057cbf49 NB |
195 | |
196 | struct vhost_work vs_completion_work; /* cmd completion work item */ | |
9d6064a3 | 197 | struct llist_head vs_completion_list; /* cmd completion queue */ |
a6c9af87 AH |
198 | |
199 | struct vhost_work vs_event_work; /* evt injection work item */ | |
200 | struct llist_head vs_event_list; /* evt injection queue */ | |
201 | ||
202 | bool vs_events_missed; /* any missed events, protected by vq->mutex */ | |
203 | int vs_events_nr; /* num of pending events, protected by vq->mutex */ | |
057cbf49 NB |
204 | }; |
205 | ||
3f8ca2e1 BM |
206 | /* |
207 | * Context for processing request and control queue operations. | |
208 | */ | |
209 | struct vhost_scsi_ctx { | |
210 | int head; | |
211 | unsigned int out, in; | |
212 | size_t req_size, rsp_size; | |
213 | size_t out_size, in_size; | |
214 | u8 *target, *lunp; | |
215 | void *req; | |
216 | struct iov_iter out_iter; | |
217 | }; | |
218 | ||
1a1ff825 | 219 | static struct workqueue_struct *vhost_scsi_workqueue; |
057cbf49 | 220 | |
1a1ff825 NB |
221 | /* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */ |
222 | static DEFINE_MUTEX(vhost_scsi_mutex); | |
223 | static LIST_HEAD(vhost_scsi_list); | |
057cbf49 | 224 | |
1a1ff825 | 225 | static void vhost_scsi_done_inflight(struct kref *kref) |
f2f0173d AH |
226 | { |
227 | struct vhost_scsi_inflight *inflight; | |
228 | ||
229 | inflight = container_of(kref, struct vhost_scsi_inflight, kref); | |
230 | complete(&inflight->comp); | |
231 | } | |
232 | ||
1a1ff825 | 233 | static void vhost_scsi_init_inflight(struct vhost_scsi *vs, |
f2f0173d AH |
234 | struct vhost_scsi_inflight *old_inflight[]) |
235 | { | |
236 | struct vhost_scsi_inflight *new_inflight; | |
237 | struct vhost_virtqueue *vq; | |
238 | int idx, i; | |
239 | ||
240 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
241 | vq = &vs->vqs[i].vq; | |
242 | ||
243 | mutex_lock(&vq->mutex); | |
244 | ||
245 | /* store old infight */ | |
246 | idx = vs->vqs[i].inflight_idx; | |
247 | if (old_inflight) | |
248 | old_inflight[i] = &vs->vqs[i].inflights[idx]; | |
249 | ||
250 | /* setup new infight */ | |
251 | vs->vqs[i].inflight_idx = idx ^ 1; | |
252 | new_inflight = &vs->vqs[i].inflights[idx ^ 1]; | |
253 | kref_init(&new_inflight->kref); | |
254 | init_completion(&new_inflight->comp); | |
255 | ||
256 | mutex_unlock(&vq->mutex); | |
257 | } | |
258 | } | |
259 | ||
260 | static struct vhost_scsi_inflight * | |
1a1ff825 | 261 | vhost_scsi_get_inflight(struct vhost_virtqueue *vq) |
f2f0173d AH |
262 | { |
263 | struct vhost_scsi_inflight *inflight; | |
264 | struct vhost_scsi_virtqueue *svq; | |
265 | ||
266 | svq = container_of(vq, struct vhost_scsi_virtqueue, vq); | |
267 | inflight = &svq->inflights[svq->inflight_idx]; | |
268 | kref_get(&inflight->kref); | |
269 | ||
270 | return inflight; | |
271 | } | |
272 | ||
1a1ff825 | 273 | static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight) |
f2f0173d | 274 | { |
1a1ff825 | 275 | kref_put(&inflight->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
276 | } |
277 | ||
1a1ff825 | 278 | static int vhost_scsi_check_true(struct se_portal_group *se_tpg) |
057cbf49 NB |
279 | { |
280 | return 1; | |
281 | } | |
282 | ||
1a1ff825 | 283 | static int vhost_scsi_check_false(struct se_portal_group *se_tpg) |
057cbf49 NB |
284 | { |
285 | return 0; | |
286 | } | |
287 | ||
1a1ff825 | 288 | static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg) |
057cbf49 | 289 | { |
1a1ff825 NB |
290 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
291 | struct vhost_scsi_tpg, se_tpg); | |
292 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
293 | |
294 | return &tport->tport_name[0]; | |
295 | } | |
296 | ||
1a1ff825 | 297 | static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg) |
057cbf49 | 298 | { |
1a1ff825 NB |
299 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
300 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 NB |
301 | return tpg->tport_tpgt; |
302 | } | |
303 | ||
b1d75fe5 NB |
304 | static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg) |
305 | { | |
306 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, | |
307 | struct vhost_scsi_tpg, se_tpg); | |
308 | ||
309 | return tpg->tv_fabric_prot_type; | |
310 | } | |
311 | ||
1a1ff825 | 312 | static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg) |
057cbf49 NB |
313 | { |
314 | return 1; | |
315 | } | |
316 | ||
1a1ff825 | 317 | static void vhost_scsi_release_cmd(struct se_cmd *se_cmd) |
057cbf49 | 318 | { |
1a1ff825 NB |
319 | struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd, |
320 | struct vhost_scsi_cmd, tvc_se_cmd); | |
de1419e4 | 321 | struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess; |
e31885dd | 322 | int i; |
084ed45b NB |
323 | |
324 | if (tv_cmd->tvc_sgl_count) { | |
084ed45b NB |
325 | for (i = 0; i < tv_cmd->tvc_sgl_count; i++) |
326 | put_page(sg_page(&tv_cmd->tvc_sgl[i])); | |
d3d665a6 | 327 | } |
e31885dd NB |
328 | if (tv_cmd->tvc_prot_sgl_count) { |
329 | for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++) | |
330 | put_page(sg_page(&tv_cmd->tvc_prot_sgl[i])); | |
331 | } | |
084ed45b | 332 | |
1a1ff825 | 333 | vhost_scsi_put_inflight(tv_cmd->inflight); |
83c2b54b | 334 | target_free_tag(se_sess, se_cmd); |
057cbf49 NB |
335 | } |
336 | ||
1a1ff825 | 337 | static u32 vhost_scsi_sess_get_index(struct se_session *se_sess) |
057cbf49 NB |
338 | { |
339 | return 0; | |
340 | } | |
341 | ||
1a1ff825 | 342 | static int vhost_scsi_write_pending(struct se_cmd *se_cmd) |
057cbf49 NB |
343 | { |
344 | /* Go ahead and process the write immediately */ | |
345 | target_execute_cmd(se_cmd); | |
346 | return 0; | |
347 | } | |
348 | ||
1a1ff825 | 349 | static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd) |
057cbf49 NB |
350 | { |
351 | return 0; | |
352 | } | |
353 | ||
1a1ff825 | 354 | static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl) |
057cbf49 NB |
355 | { |
356 | return; | |
357 | } | |
358 | ||
1a1ff825 | 359 | static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd) |
057cbf49 NB |
360 | { |
361 | return 0; | |
362 | } | |
363 | ||
1a1ff825 | 364 | static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd) |
101998f6 | 365 | { |
3c63f66a | 366 | struct vhost_scsi *vs = cmd->tvc_vhost; |
101998f6 | 367 | |
3c63f66a | 368 | llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
101998f6 NB |
369 | |
370 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
371 | } | |
057cbf49 | 372 | |
1a1ff825 | 373 | static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd) |
057cbf49 | 374 | { |
1a1ff825 NB |
375 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
376 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 377 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
378 | return 0; |
379 | } | |
380 | ||
1a1ff825 | 381 | static int vhost_scsi_queue_status(struct se_cmd *se_cmd) |
057cbf49 | 382 | { |
1a1ff825 NB |
383 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
384 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 385 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
386 | return 0; |
387 | } | |
388 | ||
1a1ff825 | 389 | static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd) |
057cbf49 | 390 | { |
b79fafac | 391 | return; |
057cbf49 NB |
392 | } |
393 | ||
1a1ff825 | 394 | static void vhost_scsi_aborted_task(struct se_cmd *se_cmd) |
131e6abc NB |
395 | { |
396 | return; | |
397 | } | |
398 | ||
1a1ff825 | 399 | static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 AH |
400 | { |
401 | vs->vs_events_nr--; | |
402 | kfree(evt); | |
403 | } | |
404 | ||
1a1ff825 NB |
405 | static struct vhost_scsi_evt * |
406 | vhost_scsi_allocate_evt(struct vhost_scsi *vs, | |
683bd967 | 407 | u32 event, u32 reason) |
a6c9af87 | 408 | { |
3ab2e420 | 409 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
1a1ff825 | 410 | struct vhost_scsi_evt *evt; |
a6c9af87 AH |
411 | |
412 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
413 | vs->vs_events_missed = true; | |
414 | return NULL; | |
415 | } | |
416 | ||
417 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
418 | if (!evt) { | |
1a1ff825 | 419 | vq_err(vq, "Failed to allocate vhost_scsi_evt\n"); |
a6c9af87 AH |
420 | vs->vs_events_missed = true; |
421 | return NULL; | |
422 | } | |
423 | ||
e72fd72e MT |
424 | evt->event.event = cpu_to_vhost32(vq, event); |
425 | evt->event.reason = cpu_to_vhost32(vq, reason); | |
a6c9af87 AH |
426 | vs->vs_events_nr++; |
427 | ||
428 | return evt; | |
429 | } | |
430 | ||
1a1ff825 | 431 | static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd) |
057cbf49 | 432 | { |
3c63f66a | 433 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
434 | |
435 | /* TODO locking against target/backend threads? */ | |
6c131d0c | 436 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 437 | |
084ed45b | 438 | } |
f2f0173d | 439 | |
084ed45b NB |
440 | static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) |
441 | { | |
afc16604 | 442 | return target_put_sess_cmd(se_cmd); |
057cbf49 NB |
443 | } |
444 | ||
683bd967 | 445 | static void |
1a1ff825 | 446 | vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 | 447 | { |
3ab2e420 | 448 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
449 | struct virtio_scsi_event *event = &evt->event; |
450 | struct virtio_scsi_event __user *eventp; | |
451 | unsigned out, in; | |
452 | int head, ret; | |
453 | ||
454 | if (!vq->private_data) { | |
455 | vs->vs_events_missed = true; | |
456 | return; | |
457 | } | |
458 | ||
459 | again: | |
460 | vhost_disable_notify(&vs->dev, vq); | |
47283bef | 461 | head = vhost_get_vq_desc(vq, vq->iov, |
a6c9af87 AH |
462 | ARRAY_SIZE(vq->iov), &out, &in, |
463 | NULL, NULL); | |
464 | if (head < 0) { | |
465 | vs->vs_events_missed = true; | |
466 | return; | |
467 | } | |
468 | if (head == vq->num) { | |
469 | if (vhost_enable_notify(&vs->dev, vq)) | |
470 | goto again; | |
471 | vs->vs_events_missed = true; | |
472 | return; | |
473 | } | |
474 | ||
475 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { | |
476 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", | |
477 | vq->iov[out].iov_len); | |
478 | vs->vs_events_missed = true; | |
479 | return; | |
480 | } | |
481 | ||
482 | if (vs->vs_events_missed) { | |
e72fd72e | 483 | event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED); |
a6c9af87 AH |
484 | vs->vs_events_missed = false; |
485 | } | |
486 | ||
487 | eventp = vq->iov[out].iov_base; | |
488 | ret = __copy_to_user(eventp, event, sizeof(*event)); | |
489 | if (!ret) | |
490 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
491 | else | |
1a1ff825 | 492 | vq_err(vq, "Faulted on vhost_scsi_send_event\n"); |
a6c9af87 AH |
493 | } |
494 | ||
1a1ff825 | 495 | static void vhost_scsi_evt_work(struct vhost_work *work) |
a6c9af87 AH |
496 | { |
497 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
498 | vs_event_work); | |
3ab2e420 | 499 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
12bdcbd5 | 500 | struct vhost_scsi_evt *evt, *t; |
a6c9af87 AH |
501 | struct llist_node *llnode; |
502 | ||
503 | mutex_lock(&vq->mutex); | |
504 | llnode = llist_del_all(&vs->vs_event_list); | |
12bdcbd5 | 505 | llist_for_each_entry_safe(evt, t, llnode, list) { |
1a1ff825 NB |
506 | vhost_scsi_do_evt_work(vs, evt); |
507 | vhost_scsi_free_evt(vs, evt); | |
a6c9af87 AH |
508 | } |
509 | mutex_unlock(&vq->mutex); | |
510 | } | |
511 | ||
057cbf49 NB |
512 | /* Fill in status and signal that we are done processing this command |
513 | * | |
514 | * This is scheduled in the vhost work queue so we are called with the owner | |
515 | * process mm and can access the vring. | |
516 | */ | |
517 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) | |
518 | { | |
519 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
520 | vs_completion_work); | |
1b7f390e | 521 | DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 522 | struct virtio_scsi_cmd_resp v_rsp; |
816e85ed | 523 | struct vhost_scsi_cmd *cmd, *t; |
9d6064a3 AH |
524 | struct llist_node *llnode; |
525 | struct se_cmd *se_cmd; | |
79c14141 | 526 | struct iov_iter iov_iter; |
1b7f390e | 527 | int ret, vq; |
057cbf49 | 528 | |
1b7f390e | 529 | bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 530 | llnode = llist_del_all(&vs->vs_completion_list); |
816e85ed | 531 | llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) { |
3c63f66a | 532 | se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
533 | |
534 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
3c63f66a | 535 | cmd, se_cmd->residual_count, se_cmd->scsi_status); |
057cbf49 NB |
536 | |
537 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
e72fd72e | 538 | v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count); |
057cbf49 NB |
539 | /* TODO is status_qualifier field needed? */ |
540 | v_rsp.status = se_cmd->scsi_status; | |
e72fd72e MT |
541 | v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq, |
542 | se_cmd->scsi_sense_length); | |
3c63f66a | 543 | memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
e72fd72e | 544 | se_cmd->scsi_sense_length); |
79c14141 | 545 | |
a77ec83a | 546 | iov_iter_init(&iov_iter, READ, &cmd->tvc_resp_iov, |
79c14141 NB |
547 | cmd->tvc_in_iovs, sizeof(v_rsp)); |
548 | ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter); | |
549 | if (likely(ret == sizeof(v_rsp))) { | |
3ab2e420 | 550 | struct vhost_scsi_virtqueue *q; |
3c63f66a AH |
551 | vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
552 | q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); | |
3ab2e420 | 553 | vq = q - vs->vqs; |
1b7f390e AH |
554 | __set_bit(vq, signal); |
555 | } else | |
057cbf49 NB |
556 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
557 | ||
3c63f66a | 558 | vhost_scsi_free_cmd(cmd); |
057cbf49 NB |
559 | } |
560 | ||
1b7f390e AH |
561 | vq = -1; |
562 | while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) | |
563 | < VHOST_SCSI_MAX_VQ) | |
3ab2e420 | 564 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
565 | } |
566 | ||
1a1ff825 NB |
567 | static struct vhost_scsi_cmd * |
568 | vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg, | |
95e7c434 NB |
569 | unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr, |
570 | u32 exp_data_len, int data_direction) | |
057cbf49 | 571 | { |
1a1ff825 NB |
572 | struct vhost_scsi_cmd *cmd; |
573 | struct vhost_scsi_nexus *tv_nexus; | |
4824d3bf | 574 | struct se_session *se_sess; |
b1935f68 | 575 | struct scatterlist *sg, *prot_sg; |
3aee26b4 | 576 | struct page **pages; |
10e9cbb6 | 577 | int tag, cpu; |
057cbf49 | 578 | |
98718312 | 579 | tv_nexus = tpg->tpg_nexus; |
057cbf49 | 580 | if (!tv_nexus) { |
1a1ff825 | 581 | pr_err("Unable to locate active struct vhost_scsi_nexus\n"); |
057cbf49 NB |
582 | return ERR_PTR(-EIO); |
583 | } | |
4824d3bf | 584 | se_sess = tv_nexus->tvn_se_sess; |
057cbf49 | 585 | |
10e9cbb6 | 586 | tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); |
4a47d3a1 | 587 | if (tag < 0) { |
1a1ff825 | 588 | pr_err("Unable to obtain tag for vhost_scsi_cmd\n"); |
4a47d3a1 NB |
589 | return ERR_PTR(-ENOMEM); |
590 | } | |
591 | ||
1a1ff825 | 592 | cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag]; |
3aee26b4 | 593 | sg = cmd->tvc_sgl; |
b1935f68 | 594 | prot_sg = cmd->tvc_prot_sgl; |
3aee26b4 | 595 | pages = cmd->tvc_upages; |
473f0b15 | 596 | memset(cmd, 0, sizeof(*cmd)); |
3aee26b4 | 597 | cmd->tvc_sgl = sg; |
b1935f68 | 598 | cmd->tvc_prot_sgl = prot_sg; |
3aee26b4 | 599 | cmd->tvc_upages = pages; |
4824d3bf | 600 | cmd->tvc_se_cmd.map_tag = tag; |
10e9cbb6 | 601 | cmd->tvc_se_cmd.map_cpu = cpu; |
95e7c434 NB |
602 | cmd->tvc_tag = scsi_tag; |
603 | cmd->tvc_lun = lun; | |
604 | cmd->tvc_task_attr = task_attr; | |
3c63f66a AH |
605 | cmd->tvc_exp_data_len = exp_data_len; |
606 | cmd->tvc_data_direction = data_direction; | |
607 | cmd->tvc_nexus = tv_nexus; | |
1a1ff825 | 608 | cmd->inflight = vhost_scsi_get_inflight(vq); |
3c63f66a | 609 | |
1a1ff825 | 610 | memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE); |
95e7c434 | 611 | |
3c63f66a | 612 | return cmd; |
057cbf49 NB |
613 | } |
614 | ||
615 | /* | |
616 | * Map a user memory range into a scatterlist | |
617 | * | |
618 | * Returns the number of scatterlist entries used or -errno on error. | |
619 | */ | |
683bd967 | 620 | static int |
1a1ff825 | 621 | vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd, |
2f240c4a | 622 | struct iov_iter *iter, |
3aee26b4 | 623 | struct scatterlist *sgl, |
5a01d082 | 624 | bool write) |
057cbf49 | 625 | { |
b4078b5f | 626 | struct page **pages = cmd->tvc_upages; |
2f240c4a AV |
627 | struct scatterlist *sg = sgl; |
628 | ssize_t bytes; | |
629 | size_t offset; | |
630 | unsigned int npages = 0; | |
3aee26b4 | 631 | |
2f240c4a AV |
632 | bytes = iov_iter_get_pages(iter, pages, LONG_MAX, |
633 | VHOST_SCSI_PREALLOC_UPAGES, &offset); | |
1810053e | 634 | /* No pages were pinned */ |
2f240c4a AV |
635 | if (bytes <= 0) |
636 | return bytes < 0 ? bytes : -EFAULT; | |
1810053e | 637 | |
2f240c4a | 638 | iov_iter_advance(iter, bytes); |
057cbf49 | 639 | |
2f240c4a AV |
640 | while (bytes) { |
641 | unsigned n = min_t(unsigned, PAGE_SIZE - offset, bytes); | |
642 | sg_set_page(sg++, pages[npages++], n, offset); | |
643 | bytes -= n; | |
644 | offset = 0; | |
645 | } | |
646 | return npages; | |
057cbf49 NB |
647 | } |
648 | ||
683bd967 | 649 | static int |
e8de56b5 | 650 | vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls) |
057cbf49 | 651 | { |
e8de56b5 | 652 | int sgl_count = 0; |
057cbf49 | 653 | |
e8de56b5 NB |
654 | if (!iter || !iter->iov) { |
655 | pr_err("%s: iter->iov is NULL, but expected bytes: %zu" | |
656 | " present\n", __func__, bytes); | |
657 | return -EINVAL; | |
658 | } | |
f3158f36 | 659 | |
e8de56b5 NB |
660 | sgl_count = iov_iter_npages(iter, 0xffff); |
661 | if (sgl_count > max_sgls) { | |
662 | pr_err("%s: requested sgl_count: %d exceeds pre-allocated" | |
663 | " max_sgls: %d\n", __func__, sgl_count, max_sgls); | |
664 | return -EINVAL; | |
5a01d082 | 665 | } |
e8de56b5 NB |
666 | return sgl_count; |
667 | } | |
057cbf49 | 668 | |
e8de56b5 | 669 | static int |
1a1ff825 NB |
670 | vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write, |
671 | struct iov_iter *iter, | |
672 | struct scatterlist *sg, int sg_count) | |
e8de56b5 | 673 | { |
11d49e9d | 674 | struct scatterlist *p = sg; |
2f240c4a | 675 | int ret; |
5a01d082 | 676 | |
2f240c4a AV |
677 | while (iov_iter_count(iter)) { |
678 | ret = vhost_scsi_map_to_sgl(cmd, iter, sg, write); | |
057cbf49 | 679 | if (ret < 0) { |
11d49e9d AV |
680 | while (p < sg) { |
681 | struct page *page = sg_page(p++); | |
e8de56b5 NB |
682 | if (page) |
683 | put_page(page); | |
684 | } | |
057cbf49 NB |
685 | return ret; |
686 | } | |
057cbf49 | 687 | sg += ret; |
057cbf49 NB |
688 | } |
689 | return 0; | |
690 | } | |
691 | ||
e31885dd | 692 | static int |
1a1ff825 | 693 | vhost_scsi_mapal(struct vhost_scsi_cmd *cmd, |
e8de56b5 NB |
694 | size_t prot_bytes, struct iov_iter *prot_iter, |
695 | size_t data_bytes, struct iov_iter *data_iter) | |
696 | { | |
697 | int sgl_count, ret; | |
698 | bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE); | |
699 | ||
700 | if (prot_bytes) { | |
701 | sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes, | |
1a1ff825 | 702 | VHOST_SCSI_PREALLOC_PROT_SGLS); |
e8de56b5 NB |
703 | if (sgl_count < 0) |
704 | return sgl_count; | |
705 | ||
706 | sg_init_table(cmd->tvc_prot_sgl, sgl_count); | |
707 | cmd->tvc_prot_sgl_count = sgl_count; | |
708 | pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__, | |
709 | cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count); | |
710 | ||
711 | ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter, | |
712 | cmd->tvc_prot_sgl, | |
713 | cmd->tvc_prot_sgl_count); | |
e31885dd | 714 | if (ret < 0) { |
e31885dd NB |
715 | cmd->tvc_prot_sgl_count = 0; |
716 | return ret; | |
717 | } | |
e8de56b5 NB |
718 | } |
719 | sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes, | |
1a1ff825 | 720 | VHOST_SCSI_PREALLOC_SGLS); |
e8de56b5 NB |
721 | if (sgl_count < 0) |
722 | return sgl_count; | |
723 | ||
724 | sg_init_table(cmd->tvc_sgl, sgl_count); | |
725 | cmd->tvc_sgl_count = sgl_count; | |
726 | pr_debug("%s data_sg %p data_sgl_count %u\n", __func__, | |
727 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
728 | ||
729 | ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter, | |
730 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
731 | if (ret < 0) { | |
732 | cmd->tvc_sgl_count = 0; | |
733 | return ret; | |
e31885dd NB |
734 | } |
735 | return 0; | |
736 | } | |
737 | ||
46243860 NB |
738 | static int vhost_scsi_to_tcm_attr(int attr) |
739 | { | |
740 | switch (attr) { | |
741 | case VIRTIO_SCSI_S_SIMPLE: | |
742 | return TCM_SIMPLE_TAG; | |
743 | case VIRTIO_SCSI_S_ORDERED: | |
744 | return TCM_ORDERED_TAG; | |
745 | case VIRTIO_SCSI_S_HEAD: | |
746 | return TCM_HEAD_TAG; | |
747 | case VIRTIO_SCSI_S_ACA: | |
748 | return TCM_ACA_TAG; | |
749 | default: | |
750 | break; | |
751 | } | |
752 | return TCM_SIMPLE_TAG; | |
753 | } | |
754 | ||
1a1ff825 | 755 | static void vhost_scsi_submission_work(struct work_struct *work) |
057cbf49 | 756 | { |
1a1ff825 NB |
757 | struct vhost_scsi_cmd *cmd = |
758 | container_of(work, struct vhost_scsi_cmd, work); | |
759 | struct vhost_scsi_nexus *tv_nexus; | |
3c63f66a | 760 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
95e7c434 NB |
761 | struct scatterlist *sg_ptr, *sg_prot_ptr = NULL; |
762 | int rc; | |
057cbf49 | 763 | |
95e7c434 | 764 | /* FIXME: BIDI operation */ |
3c63f66a AH |
765 | if (cmd->tvc_sgl_count) { |
766 | sg_ptr = cmd->tvc_sgl; | |
95e7c434 NB |
767 | |
768 | if (cmd->tvc_prot_sgl_count) | |
769 | sg_prot_ptr = cmd->tvc_prot_sgl; | |
770 | else | |
771 | se_cmd->prot_pto = true; | |
057cbf49 NB |
772 | } else { |
773 | sg_ptr = NULL; | |
774 | } | |
3c63f66a | 775 | tv_nexus = cmd->tvc_nexus; |
9f0abc15 | 776 | |
649ee054 | 777 | se_cmd->tag = 0; |
9f0abc15 | 778 | rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, |
3c63f66a AH |
779 | cmd->tvc_cdb, &cmd->tvc_sense_buf[0], |
780 | cmd->tvc_lun, cmd->tvc_exp_data_len, | |
46243860 NB |
781 | vhost_scsi_to_tcm_attr(cmd->tvc_task_attr), |
782 | cmd->tvc_data_direction, TARGET_SCF_ACK_KREF, | |
783 | sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr, | |
784 | cmd->tvc_prot_sgl_count); | |
057cbf49 NB |
785 | if (rc < 0) { |
786 | transport_send_check_condition_and_sense(se_cmd, | |
9f0abc15 | 787 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
057cbf49 | 788 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 789 | } |
057cbf49 NB |
790 | } |
791 | ||
683bd967 AH |
792 | static void |
793 | vhost_scsi_send_bad_target(struct vhost_scsi *vs, | |
794 | struct vhost_virtqueue *vq, | |
795 | int head, unsigned out) | |
637ab21e AH |
796 | { |
797 | struct virtio_scsi_cmd_resp __user *resp; | |
798 | struct virtio_scsi_cmd_resp rsp; | |
799 | int ret; | |
800 | ||
801 | memset(&rsp, 0, sizeof(rsp)); | |
802 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
803 | resp = vq->iov[out].iov_base; | |
804 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
805 | if (!ret) | |
806 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
807 | else | |
808 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
809 | } | |
810 | ||
09d75832 BM |
811 | static int |
812 | vhost_scsi_get_desc(struct vhost_scsi *vs, struct vhost_virtqueue *vq, | |
813 | struct vhost_scsi_ctx *vc) | |
814 | { | |
815 | int ret = -ENXIO; | |
816 | ||
817 | vc->head = vhost_get_vq_desc(vq, vq->iov, | |
818 | ARRAY_SIZE(vq->iov), &vc->out, &vc->in, | |
819 | NULL, NULL); | |
820 | ||
821 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", | |
822 | vc->head, vc->out, vc->in); | |
823 | ||
824 | /* On error, stop handling until the next kick. */ | |
825 | if (unlikely(vc->head < 0)) | |
826 | goto done; | |
827 | ||
828 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
829 | if (vc->head == vq->num) { | |
830 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
831 | vhost_disable_notify(&vs->dev, vq); | |
832 | ret = -EAGAIN; | |
833 | } | |
834 | goto done; | |
835 | } | |
836 | ||
837 | /* | |
838 | * Get the size of request and response buffers. | |
839 | * FIXME: Not correct for BIDI operation | |
840 | */ | |
841 | vc->out_size = iov_length(vq->iov, vc->out); | |
842 | vc->in_size = iov_length(&vq->iov[vc->out], vc->in); | |
843 | ||
844 | /* | |
845 | * Copy over the virtio-scsi request header, which for a | |
846 | * ANY_LAYOUT enabled guest may span multiple iovecs, or a | |
847 | * single iovec may contain both the header + outgoing | |
848 | * WRITE payloads. | |
849 | * | |
850 | * copy_from_iter() will advance out_iter, so that it will | |
851 | * point at the start of the outgoing WRITE payload, if | |
852 | * DMA_TO_DEVICE is set. | |
853 | */ | |
854 | iov_iter_init(&vc->out_iter, WRITE, vq->iov, vc->out, vc->out_size); | |
855 | ret = 0; | |
856 | ||
857 | done: | |
858 | return ret; | |
859 | } | |
860 | ||
861 | static int | |
862 | vhost_scsi_chk_size(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc) | |
863 | { | |
864 | if (unlikely(vc->in_size < vc->rsp_size)) { | |
865 | vq_err(vq, | |
866 | "Response buf too small, need min %zu bytes got %zu", | |
867 | vc->rsp_size, vc->in_size); | |
868 | return -EINVAL; | |
869 | } else if (unlikely(vc->out_size < vc->req_size)) { | |
870 | vq_err(vq, | |
871 | "Request buf too small, need min %zu bytes got %zu", | |
872 | vc->req_size, vc->out_size); | |
873 | return -EIO; | |
874 | } | |
875 | ||
876 | return 0; | |
877 | } | |
878 | ||
879 | static int | |
880 | vhost_scsi_get_req(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc, | |
881 | struct vhost_scsi_tpg **tpgp) | |
882 | { | |
883 | int ret = -EIO; | |
884 | ||
885 | if (unlikely(!copy_from_iter_full(vc->req, vc->req_size, | |
886 | &vc->out_iter))) { | |
a691ffb4 | 887 | vq_err(vq, "Faulted on copy_from_iter_full\n"); |
09d75832 BM |
888 | } else if (unlikely(*vc->lunp != 1)) { |
889 | /* virtio-scsi spec requires byte 0 of the lun to be 1 */ | |
890 | vq_err(vq, "Illegal virtio-scsi lun: %u\n", *vc->lunp); | |
891 | } else { | |
892 | struct vhost_scsi_tpg **vs_tpg, *tpg; | |
893 | ||
894 | vs_tpg = vq->private_data; /* validated at handler entry */ | |
895 | ||
896 | tpg = READ_ONCE(vs_tpg[*vc->target]); | |
897 | if (unlikely(!tpg)) { | |
898 | vq_err(vq, "Target 0x%x does not exist\n", *vc->target); | |
899 | } else { | |
900 | if (tpgp) | |
901 | *tpgp = tpg; | |
902 | ret = 0; | |
903 | } | |
904 | } | |
905 | ||
906 | return ret; | |
907 | } | |
908 | ||
683bd967 AH |
909 | static void |
910 | vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
057cbf49 | 911 | { |
1a1ff825 | 912 | struct vhost_scsi_tpg **vs_tpg, *tpg; |
057cbf49 | 913 | struct virtio_scsi_cmd_req v_req; |
95e7c434 | 914 | struct virtio_scsi_cmd_req_pi v_req_pi; |
09d75832 | 915 | struct vhost_scsi_ctx vc; |
1a1ff825 | 916 | struct vhost_scsi_cmd *cmd; |
09d75832 | 917 | struct iov_iter in_iter, prot_iter, data_iter; |
95e7c434 | 918 | u64 tag; |
09b13fa8 | 919 | u32 exp_data_len, data_direction; |
09d75832 | 920 | int ret, prot_bytes; |
95e7c434 | 921 | u16 lun; |
09d75832 | 922 | u8 task_attr; |
09b13fa8 | 923 | bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI); |
09d75832 | 924 | void *cdb; |
057cbf49 | 925 | |
e7802212 | 926 | mutex_lock(&vq->mutex); |
4f7f46d3 AH |
927 | /* |
928 | * We can handle the vq only after the endpoint is setup by calling the | |
929 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
4f7f46d3 | 930 | */ |
e7802212 | 931 | vs_tpg = vq->private_data; |
4f7f46d3 | 932 | if (!vs_tpg) |
e7802212 | 933 | goto out; |
057cbf49 | 934 | |
09d75832 BM |
935 | memset(&vc, 0, sizeof(vc)); |
936 | vc.rsp_size = sizeof(struct virtio_scsi_cmd_resp); | |
937 | ||
057cbf49 NB |
938 | vhost_disable_notify(&vs->dev, vq); |
939 | ||
940 | for (;;) { | |
09d75832 BM |
941 | ret = vhost_scsi_get_desc(vs, vq, &vc); |
942 | if (ret) | |
943 | goto err; | |
944 | ||
09b13fa8 NB |
945 | /* |
946 | * Setup pointers and values based upon different virtio-scsi | |
947 | * request header if T10_PI is enabled in KVM guest. | |
948 | */ | |
949 | if (t10_pi) { | |
09d75832 BM |
950 | vc.req = &v_req_pi; |
951 | vc.req_size = sizeof(v_req_pi); | |
952 | vc.lunp = &v_req_pi.lun[0]; | |
953 | vc.target = &v_req_pi.lun[1]; | |
95e7c434 | 954 | } else { |
09d75832 BM |
955 | vc.req = &v_req; |
956 | vc.req_size = sizeof(v_req); | |
957 | vc.lunp = &v_req.lun[0]; | |
958 | vc.target = &v_req.lun[1]; | |
95e7c434 NB |
959 | } |
960 | ||
09b13fa8 | 961 | /* |
09d75832 BM |
962 | * Validate the size of request and response buffers. |
963 | * Check for a sane response buffer so we can report | |
964 | * early errors back to the guest. | |
09b13fa8 | 965 | */ |
09d75832 BM |
966 | ret = vhost_scsi_chk_size(vq, &vc); |
967 | if (ret) | |
968 | goto err; | |
057cbf49 | 969 | |
09d75832 BM |
970 | ret = vhost_scsi_get_req(vq, &vc, &tpg); |
971 | if (ret) | |
972 | goto err; | |
973 | ||
974 | ret = -EIO; /* bad target on any error from here on */ | |
7fe412d0 | 975 | |
95e7c434 | 976 | /* |
09b13fa8 NB |
977 | * Determine data_direction by calculating the total outgoing |
978 | * iovec sizes + incoming iovec sizes vs. virtio-scsi request + | |
979 | * response headers respectively. | |
95e7c434 | 980 | * |
09b13fa8 NB |
981 | * For DMA_TO_DEVICE this is out_iter, which is already pointing |
982 | * to the right place. | |
983 | * | |
984 | * For DMA_FROM_DEVICE, the iovec will be just past the end | |
985 | * of the virtio-scsi response header in either the same | |
986 | * or immediately following iovec. | |
95e7c434 | 987 | * |
09b13fa8 NB |
988 | * Any associated T10_PI bytes for the outgoing / incoming |
989 | * payloads are included in calculation of exp_data_len here. | |
95e7c434 | 990 | */ |
09b13fa8 NB |
991 | prot_bytes = 0; |
992 | ||
09d75832 | 993 | if (vc.out_size > vc.req_size) { |
09b13fa8 | 994 | data_direction = DMA_TO_DEVICE; |
09d75832 BM |
995 | exp_data_len = vc.out_size - vc.req_size; |
996 | data_iter = vc.out_iter; | |
997 | } else if (vc.in_size > vc.rsp_size) { | |
09b13fa8 | 998 | data_direction = DMA_FROM_DEVICE; |
09d75832 | 999 | exp_data_len = vc.in_size - vc.rsp_size; |
09b13fa8 | 1000 | |
09d75832 BM |
1001 | iov_iter_init(&in_iter, READ, &vq->iov[vc.out], vc.in, |
1002 | vc.rsp_size + exp_data_len); | |
1003 | iov_iter_advance(&in_iter, vc.rsp_size); | |
09b13fa8 NB |
1004 | data_iter = in_iter; |
1005 | } else { | |
1006 | data_direction = DMA_NONE; | |
1007 | exp_data_len = 0; | |
1008 | } | |
1009 | /* | |
1010 | * If T10_PI header + payload is present, setup prot_iter values | |
1011 | * and recalculate data_iter for vhost_scsi_mapal() mapping to | |
1012 | * host scatterlists via get_user_pages_fast(). | |
95e7c434 | 1013 | */ |
09b13fa8 | 1014 | if (t10_pi) { |
95e7c434 NB |
1015 | if (v_req_pi.pi_bytesout) { |
1016 | if (data_direction != DMA_TO_DEVICE) { | |
09b13fa8 NB |
1017 | vq_err(vq, "Received non zero pi_bytesout," |
1018 | " but wrong data_direction\n"); | |
09d75832 | 1019 | goto err; |
95e7c434 | 1020 | } |
e72fd72e | 1021 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout); |
95e7c434 NB |
1022 | } else if (v_req_pi.pi_bytesin) { |
1023 | if (data_direction != DMA_FROM_DEVICE) { | |
09b13fa8 NB |
1024 | vq_err(vq, "Received non zero pi_bytesin," |
1025 | " but wrong data_direction\n"); | |
09d75832 | 1026 | goto err; |
95e7c434 | 1027 | } |
e72fd72e | 1028 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin); |
95e7c434 | 1029 | } |
09b13fa8 | 1030 | /* |
4542d623 GE |
1031 | * Set prot_iter to data_iter and truncate it to |
1032 | * prot_bytes, and advance data_iter past any | |
09b13fa8 NB |
1033 | * preceeding prot_bytes that may be present. |
1034 | * | |
1035 | * Also fix up the exp_data_len to reflect only the | |
1036 | * actual data payload length. | |
1037 | */ | |
95e7c434 | 1038 | if (prot_bytes) { |
09b13fa8 NB |
1039 | exp_data_len -= prot_bytes; |
1040 | prot_iter = data_iter; | |
4542d623 | 1041 | iov_iter_truncate(&prot_iter, prot_bytes); |
09b13fa8 | 1042 | iov_iter_advance(&data_iter, prot_bytes); |
95e7c434 | 1043 | } |
e72fd72e | 1044 | tag = vhost64_to_cpu(vq, v_req_pi.tag); |
95e7c434 NB |
1045 | task_attr = v_req_pi.task_attr; |
1046 | cdb = &v_req_pi.cdb[0]; | |
1047 | lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF; | |
1048 | } else { | |
e72fd72e | 1049 | tag = vhost64_to_cpu(vq, v_req.tag); |
95e7c434 NB |
1050 | task_attr = v_req.task_attr; |
1051 | cdb = &v_req.cdb[0]; | |
1052 | lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; | |
1053 | } | |
95e7c434 | 1054 | /* |
09b13fa8 NB |
1055 | * Check that the received CDB size does not exceeded our |
1056 | * hardcoded max for vhost-scsi, then get a pre-allocated | |
1057 | * cmd descriptor for the new virtio-scsi tag. | |
95e7c434 NB |
1058 | * |
1059 | * TODO what if cdb was too small for varlen cdb header? | |
1060 | */ | |
1a1ff825 | 1061 | if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) { |
95e7c434 NB |
1062 | vq_err(vq, "Received SCSI CDB with command_size: %d that" |
1063 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
1a1ff825 | 1064 | scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE); |
09d75832 | 1065 | goto err; |
95e7c434 | 1066 | } |
95e7c434 | 1067 | cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr, |
9f977ef7 NB |
1068 | exp_data_len + prot_bytes, |
1069 | data_direction); | |
3c63f66a | 1070 | if (IS_ERR(cmd)) { |
4824d3bf | 1071 | vq_err(vq, "vhost_scsi_get_tag failed %ld\n", |
09b13fa8 | 1072 | PTR_ERR(cmd)); |
09d75832 | 1073 | goto err; |
057cbf49 | 1074 | } |
3c63f66a AH |
1075 | cmd->tvc_vhost = vs; |
1076 | cmd->tvc_vq = vq; | |
09d75832 BM |
1077 | cmd->tvc_resp_iov = vq->iov[vc.out]; |
1078 | cmd->tvc_in_iovs = vc.in; | |
057cbf49 | 1079 | |
057cbf49 | 1080 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", |
09b13fa8 NB |
1081 | cmd->tvc_cdb[0], cmd->tvc_lun); |
1082 | pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:" | |
1083 | " %d\n", cmd, exp_data_len, prot_bytes, data_direction); | |
057cbf49 NB |
1084 | |
1085 | if (data_direction != DMA_NONE) { | |
09d75832 BM |
1086 | if (unlikely(vhost_scsi_mapal(cmd, prot_bytes, |
1087 | &prot_iter, exp_data_len, | |
1088 | &data_iter))) { | |
057cbf49 | 1089 | vq_err(vq, "Failed to map iov to sgl\n"); |
1a1ff825 | 1090 | vhost_scsi_release_cmd(&cmd->tvc_se_cmd); |
09d75832 | 1091 | goto err; |
057cbf49 NB |
1092 | } |
1093 | } | |
057cbf49 NB |
1094 | /* |
1095 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
1096 | * complete the virtio-scsi request in TCM callback context via | |
09b13fa8 | 1097 | * vhost_scsi_queue_data_in() and vhost_scsi_queue_status() |
057cbf49 | 1098 | */ |
09d75832 | 1099 | cmd->tvc_vq_desc = vc.head; |
057cbf49 | 1100 | /* |
09b13fa8 NB |
1101 | * Dispatch cmd descriptor for cmwq execution in process |
1102 | * context provided by vhost_scsi_workqueue. This also ensures | |
1103 | * cmd is executed on the same kworker CPU as this vhost | |
1104 | * thread to gain positive L2 cache locality effects. | |
057cbf49 | 1105 | */ |
1a1ff825 NB |
1106 | INIT_WORK(&cmd->work, vhost_scsi_submission_work); |
1107 | queue_work(vhost_scsi_workqueue, &cmd->work); | |
09d75832 BM |
1108 | ret = 0; |
1109 | err: | |
1110 | /* | |
1111 | * ENXIO: No more requests, or read error, wait for next kick | |
1112 | * EINVAL: Invalid response buffer, drop the request | |
1113 | * EIO: Respond with bad target | |
1114 | * EAGAIN: Pending request | |
1115 | */ | |
1116 | if (ret == -ENXIO) | |
1117 | break; | |
1118 | else if (ret == -EIO) | |
1119 | vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out); | |
057cbf49 | 1120 | } |
e7802212 | 1121 | out: |
7ea206cf | 1122 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
1123 | } |
1124 | ||
0d02dbd6 | 1125 | static void |
09d75832 BM |
1126 | vhost_scsi_send_tmf_reject(struct vhost_scsi *vs, |
1127 | struct vhost_virtqueue *vq, | |
1128 | struct vhost_scsi_ctx *vc) | |
0d02dbd6 BM |
1129 | { |
1130 | struct virtio_scsi_ctrl_tmf_resp __user *resp; | |
1131 | struct virtio_scsi_ctrl_tmf_resp rsp; | |
1132 | int ret; | |
1133 | ||
1134 | pr_debug("%s\n", __func__); | |
1135 | memset(&rsp, 0, sizeof(rsp)); | |
1136 | rsp.response = VIRTIO_SCSI_S_FUNCTION_REJECTED; | |
3f8ca2e1 | 1137 | resp = vq->iov[vc->out].iov_base; |
0d02dbd6 BM |
1138 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); |
1139 | if (!ret) | |
3f8ca2e1 | 1140 | vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0); |
0d02dbd6 BM |
1141 | else |
1142 | pr_err("Faulted on virtio_scsi_ctrl_tmf_resp\n"); | |
1143 | } | |
1144 | ||
1145 | static void | |
1146 | vhost_scsi_send_an_resp(struct vhost_scsi *vs, | |
3f8ca2e1 BM |
1147 | struct vhost_virtqueue *vq, |
1148 | struct vhost_scsi_ctx *vc) | |
0d02dbd6 BM |
1149 | { |
1150 | struct virtio_scsi_ctrl_an_resp __user *resp; | |
1151 | struct virtio_scsi_ctrl_an_resp rsp; | |
1152 | int ret; | |
1153 | ||
1154 | pr_debug("%s\n", __func__); | |
1155 | memset(&rsp, 0, sizeof(rsp)); /* event_actual = 0 */ | |
1156 | rsp.response = VIRTIO_SCSI_S_OK; | |
3f8ca2e1 | 1157 | resp = vq->iov[vc->out].iov_base; |
0d02dbd6 BM |
1158 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); |
1159 | if (!ret) | |
3f8ca2e1 | 1160 | vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0); |
0d02dbd6 BM |
1161 | else |
1162 | pr_err("Faulted on virtio_scsi_ctrl_an_resp\n"); | |
1163 | } | |
1164 | ||
1165 | static void | |
1166 | vhost_scsi_ctl_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
1167 | { | |
1168 | union { | |
1169 | __virtio32 type; | |
1170 | struct virtio_scsi_ctrl_an_req an; | |
1171 | struct virtio_scsi_ctrl_tmf_req tmf; | |
1172 | } v_req; | |
3f8ca2e1 BM |
1173 | struct vhost_scsi_ctx vc; |
1174 | size_t typ_size; | |
1175 | int ret; | |
0d02dbd6 BM |
1176 | |
1177 | mutex_lock(&vq->mutex); | |
1178 | /* | |
1179 | * We can handle the vq only after the endpoint is setup by calling the | |
1180 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
1181 | */ | |
1182 | if (!vq->private_data) | |
1183 | goto out; | |
1184 | ||
3f8ca2e1 BM |
1185 | memset(&vc, 0, sizeof(vc)); |
1186 | ||
0d02dbd6 BM |
1187 | vhost_disable_notify(&vs->dev, vq); |
1188 | ||
1189 | for (;;) { | |
3f8ca2e1 BM |
1190 | ret = vhost_scsi_get_desc(vs, vq, &vc); |
1191 | if (ret) | |
1192 | goto err; | |
0d02dbd6 BM |
1193 | |
1194 | /* | |
3f8ca2e1 BM |
1195 | * Get the request type first in order to setup |
1196 | * other parameters dependent on the type. | |
0d02dbd6 | 1197 | */ |
3f8ca2e1 | 1198 | vc.req = &v_req.type; |
0d02dbd6 BM |
1199 | typ_size = sizeof(v_req.type); |
1200 | ||
3f8ca2e1 BM |
1201 | if (unlikely(!copy_from_iter_full(vc.req, typ_size, |
1202 | &vc.out_iter))) { | |
0d02dbd6 BM |
1203 | vq_err(vq, "Faulted on copy_from_iter tmf type\n"); |
1204 | /* | |
3f8ca2e1 BM |
1205 | * The size of the response buffer depends on the |
1206 | * request type and must be validated against it. | |
0d02dbd6 BM |
1207 | * Since the request type is not known, don't send |
1208 | * a response. | |
1209 | */ | |
1210 | continue; | |
1211 | } | |
1212 | ||
1213 | switch (v_req.type) { | |
1214 | case VIRTIO_SCSI_T_TMF: | |
3f8ca2e1 BM |
1215 | vc.req = &v_req.tmf; |
1216 | vc.req_size = sizeof(struct virtio_scsi_ctrl_tmf_req); | |
1217 | vc.rsp_size = sizeof(struct virtio_scsi_ctrl_tmf_resp); | |
1218 | vc.lunp = &v_req.tmf.lun[0]; | |
1219 | vc.target = &v_req.tmf.lun[1]; | |
0d02dbd6 BM |
1220 | break; |
1221 | case VIRTIO_SCSI_T_AN_QUERY: | |
1222 | case VIRTIO_SCSI_T_AN_SUBSCRIBE: | |
3f8ca2e1 BM |
1223 | vc.req = &v_req.an; |
1224 | vc.req_size = sizeof(struct virtio_scsi_ctrl_an_req); | |
1225 | vc.rsp_size = sizeof(struct virtio_scsi_ctrl_an_resp); | |
1226 | vc.lunp = &v_req.an.lun[0]; | |
1227 | vc.target = NULL; | |
0d02dbd6 BM |
1228 | break; |
1229 | default: | |
1230 | vq_err(vq, "Unknown control request %d", v_req.type); | |
1231 | continue; | |
1232 | } | |
1233 | ||
1234 | /* | |
3f8ca2e1 BM |
1235 | * Validate the size of request and response buffers. |
1236 | * Check for a sane response buffer so we can report | |
1237 | * early errors back to the guest. | |
0d02dbd6 | 1238 | */ |
3f8ca2e1 BM |
1239 | ret = vhost_scsi_chk_size(vq, &vc); |
1240 | if (ret) | |
1241 | goto err; | |
0d02dbd6 | 1242 | |
3f8ca2e1 BM |
1243 | /* |
1244 | * Get the rest of the request now that its size is known. | |
1245 | */ | |
1246 | vc.req += typ_size; | |
1247 | vc.req_size -= typ_size; | |
0d02dbd6 | 1248 | |
3f8ca2e1 BM |
1249 | ret = vhost_scsi_get_req(vq, &vc, NULL); |
1250 | if (ret) | |
1251 | goto err; | |
0d02dbd6 | 1252 | |
3f8ca2e1 | 1253 | if (v_req.type == VIRTIO_SCSI_T_TMF) |
09d75832 | 1254 | vhost_scsi_send_tmf_reject(vs, vq, &vc); |
3f8ca2e1 BM |
1255 | else |
1256 | vhost_scsi_send_an_resp(vs, vq, &vc); | |
1257 | err: | |
1258 | /* | |
1259 | * ENXIO: No more requests, or read error, wait for next kick | |
1260 | * EINVAL: Invalid response buffer, drop the request | |
1261 | * EIO: Respond with bad target | |
1262 | * EAGAIN: Pending request | |
1263 | */ | |
1264 | if (ret == -ENXIO) | |
1265 | break; | |
1266 | else if (ret == -EIO) | |
1267 | vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out); | |
0d02dbd6 BM |
1268 | } |
1269 | out: | |
1270 | mutex_unlock(&vq->mutex); | |
1271 | } | |
1272 | ||
057cbf49 NB |
1273 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) |
1274 | { | |
0d02dbd6 BM |
1275 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1276 | poll.work); | |
1277 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1278 | ||
101998f6 | 1279 | pr_debug("%s: The handling func for control queue.\n", __func__); |
0d02dbd6 | 1280 | vhost_scsi_ctl_handle_vq(vs, vq); |
057cbf49 NB |
1281 | } |
1282 | ||
683bd967 | 1283 | static void |
1a1ff825 NB |
1284 | vhost_scsi_send_evt(struct vhost_scsi *vs, |
1285 | struct vhost_scsi_tpg *tpg, | |
683bd967 AH |
1286 | struct se_lun *lun, |
1287 | u32 event, | |
1288 | u32 reason) | |
a6c9af87 | 1289 | { |
1a1ff825 | 1290 | struct vhost_scsi_evt *evt; |
a6c9af87 | 1291 | |
1a1ff825 | 1292 | evt = vhost_scsi_allocate_evt(vs, event, reason); |
a6c9af87 AH |
1293 | if (!evt) |
1294 | return; | |
1295 | ||
1296 | if (tpg && lun) { | |
1297 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
1298 | /* | |
1299 | * Note: evt->event is zeroed when we allocate it and | |
1300 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
1301 | */ | |
1302 | evt->event.lun[0] = 0x01; | |
59c816c1 | 1303 | evt->event.lun[1] = tpg->tport_tpgt; |
a6c9af87 AH |
1304 | if (lun->unpacked_lun >= 256) |
1305 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
1306 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
1307 | } | |
1308 | ||
1309 | llist_add(&evt->list, &vs->vs_event_list); | |
1310 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
1311 | } | |
1312 | ||
057cbf49 NB |
1313 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
1314 | { | |
a6c9af87 AH |
1315 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1316 | poll.work); | |
1317 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1318 | ||
1319 | mutex_lock(&vq->mutex); | |
1320 | if (!vq->private_data) | |
1321 | goto out; | |
1322 | ||
1323 | if (vs->vs_events_missed) | |
1a1ff825 | 1324 | vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); |
a6c9af87 AH |
1325 | out: |
1326 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
1327 | } |
1328 | ||
1329 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
1330 | { | |
1331 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
1332 | poll.work); | |
1333 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1334 | ||
1b7f390e | 1335 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
1336 | } |
1337 | ||
4f7f46d3 AH |
1338 | static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
1339 | { | |
3ab2e420 | 1340 | vhost_poll_flush(&vs->vqs[index].vq.poll); |
4f7f46d3 AH |
1341 | } |
1342 | ||
3dfbff32 | 1343 | /* Callers must hold dev mutex */ |
4f7f46d3 AH |
1344 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
1345 | { | |
f2f0173d | 1346 | struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; |
4f7f46d3 AH |
1347 | int i; |
1348 | ||
f2f0173d | 1349 | /* Init new inflight and remember the old inflight */ |
1a1ff825 | 1350 | vhost_scsi_init_inflight(vs, old_inflight); |
f2f0173d AH |
1351 | |
1352 | /* | |
1353 | * The inflight->kref was initialized to 1. We decrement it here to | |
1354 | * indicate the start of the flush operation so that it will reach 0 | |
1355 | * when all the reqs are finished. | |
1356 | */ | |
1357 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1a1ff825 | 1358 | kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
1359 | |
1360 | /* Flush both the vhost poll and vhost work */ | |
4f7f46d3 AH |
1361 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
1362 | vhost_scsi_flush_vq(vs, i); | |
1363 | vhost_work_flush(&vs->dev, &vs->vs_completion_work); | |
a6c9af87 | 1364 | vhost_work_flush(&vs->dev, &vs->vs_event_work); |
f2f0173d AH |
1365 | |
1366 | /* Wait for all reqs issued before the flush to be finished */ | |
1367 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1368 | wait_for_completion(&old_inflight[i]->comp); | |
4f7f46d3 AH |
1369 | } |
1370 | ||
057cbf49 NB |
1371 | /* |
1372 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
1a1ff825 | 1373 | * vhost_scsi_tpg with an active struct vhost_scsi_nexus |
f2b7daf5 AH |
1374 | * |
1375 | * The lock nesting rule is: | |
1a1ff825 | 1376 | * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex |
057cbf49 | 1377 | */ |
683bd967 AH |
1378 | static int |
1379 | vhost_scsi_set_endpoint(struct vhost_scsi *vs, | |
1380 | struct vhost_scsi_target *t) | |
057cbf49 | 1381 | { |
ab8edab1 | 1382 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1383 | struct vhost_scsi_tport *tv_tport; |
1384 | struct vhost_scsi_tpg *tpg; | |
1385 | struct vhost_scsi_tpg **vs_tpg; | |
4f7f46d3 AH |
1386 | struct vhost_virtqueue *vq; |
1387 | int index, ret, i, len; | |
67e18cf9 | 1388 | bool match = false; |
057cbf49 | 1389 | |
1a1ff825 | 1390 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 1391 | mutex_lock(&vs->dev.mutex); |
f2b7daf5 | 1392 | |
057cbf49 NB |
1393 | /* Verify that ring has been setup correctly. */ |
1394 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
1395 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 1396 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
1397 | ret = -EFAULT; |
1398 | goto out; | |
057cbf49 NB |
1399 | } |
1400 | } | |
057cbf49 | 1401 | |
4f7f46d3 AH |
1402 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
1403 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
1404 | if (!vs_tpg) { | |
f2b7daf5 AH |
1405 | ret = -ENOMEM; |
1406 | goto out; | |
4f7f46d3 AH |
1407 | } |
1408 | if (vs->vs_tpg) | |
1409 | memcpy(vs_tpg, vs->vs_tpg, len); | |
1410 | ||
1a1ff825 | 1411 | list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) { |
98718312 AH |
1412 | mutex_lock(&tpg->tv_tpg_mutex); |
1413 | if (!tpg->tpg_nexus) { | |
1414 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1415 | continue; |
1416 | } | |
98718312 AH |
1417 | if (tpg->tv_tpg_vhost_count != 0) { |
1418 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1419 | continue; |
1420 | } | |
98718312 | 1421 | tv_tport = tpg->tport; |
057cbf49 | 1422 | |
67e18cf9 | 1423 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
98718312 | 1424 | if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
4f7f46d3 | 1425 | kfree(vs_tpg); |
98718312 | 1426 | mutex_unlock(&tpg->tv_tpg_mutex); |
f2b7daf5 AH |
1427 | ret = -EEXIST; |
1428 | goto out; | |
101998f6 | 1429 | } |
ab8edab1 NB |
1430 | /* |
1431 | * In order to ensure individual vhost-scsi configfs | |
1432 | * groups cannot be removed while in use by vhost ioctl, | |
1433 | * go ahead and take an explicit se_tpg->tpg_group.cg_item | |
1434 | * dependency now. | |
1435 | */ | |
1436 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1437 | ret = target_depend_item(&se_tpg->tpg_group.cg_item); |
ab8edab1 | 1438 | if (ret) { |
a691ffb4 | 1439 | pr_warn("target_depend_item() failed: %d\n", ret); |
ab8edab1 NB |
1440 | kfree(vs_tpg); |
1441 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1442 | goto out; | |
1443 | } | |
98718312 AH |
1444 | tpg->tv_tpg_vhost_count++; |
1445 | tpg->vhost_scsi = vs; | |
1446 | vs_tpg[tpg->tport_tpgt] = tpg; | |
4e857c58 | 1447 | smp_mb__after_atomic(); |
67e18cf9 | 1448 | match = true; |
057cbf49 | 1449 | } |
98718312 | 1450 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1451 | } |
67e18cf9 AH |
1452 | |
1453 | if (match) { | |
1454 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1455 | sizeof(vs->vs_vhost_wwpn)); | |
4f7f46d3 | 1456 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
3ab2e420 | 1457 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1458 | mutex_lock(&vq->mutex); |
22fa90c7 | 1459 | vq->private_data = vs_tpg; |
80f7d030 | 1460 | vhost_vq_init_access(vq); |
4f7f46d3 AH |
1461 | mutex_unlock(&vq->mutex); |
1462 | } | |
67e18cf9 AH |
1463 | ret = 0; |
1464 | } else { | |
1465 | ret = -EEXIST; | |
1466 | } | |
1467 | ||
4f7f46d3 AH |
1468 | /* |
1469 | * Act as synchronize_rcu to make sure access to | |
1470 | * old vs->vs_tpg is finished. | |
1471 | */ | |
1472 | vhost_scsi_flush(vs); | |
1473 | kfree(vs->vs_tpg); | |
1474 | vs->vs_tpg = vs_tpg; | |
1475 | ||
f2b7daf5 | 1476 | out: |
67e18cf9 | 1477 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1478 | mutex_unlock(&vhost_scsi_mutex); |
67e18cf9 | 1479 | return ret; |
057cbf49 NB |
1480 | } |
1481 | ||
683bd967 AH |
1482 | static int |
1483 | vhost_scsi_clear_endpoint(struct vhost_scsi *vs, | |
1484 | struct vhost_scsi_target *t) | |
057cbf49 | 1485 | { |
ab8edab1 | 1486 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1487 | struct vhost_scsi_tport *tv_tport; |
1488 | struct vhost_scsi_tpg *tpg; | |
4f7f46d3 AH |
1489 | struct vhost_virtqueue *vq; |
1490 | bool match = false; | |
67e18cf9 AH |
1491 | int index, ret, i; |
1492 | u8 target; | |
057cbf49 | 1493 | |
1a1ff825 | 1494 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 NB |
1495 | mutex_lock(&vs->dev.mutex); |
1496 | /* Verify that ring has been setup correctly. */ | |
1497 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1498 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1499 | ret = -EFAULT; |
038e0af4 | 1500 | goto err_dev; |
057cbf49 NB |
1501 | } |
1502 | } | |
4f7f46d3 AH |
1503 | |
1504 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1505 | ret = 0; |
1506 | goto err_dev; | |
4f7f46d3 AH |
1507 | } |
1508 | ||
67e18cf9 AH |
1509 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1510 | target = i; | |
98718312 AH |
1511 | tpg = vs->vs_tpg[target]; |
1512 | if (!tpg) | |
67e18cf9 AH |
1513 | continue; |
1514 | ||
98718312 AH |
1515 | mutex_lock(&tpg->tv_tpg_mutex); |
1516 | tv_tport = tpg->tport; | |
67e18cf9 AH |
1517 | if (!tv_tport) { |
1518 | ret = -ENODEV; | |
038e0af4 | 1519 | goto err_tpg; |
67e18cf9 AH |
1520 | } |
1521 | ||
1522 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
98718312 | 1523 | pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" |
67e18cf9 | 1524 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", |
98718312 | 1525 | tv_tport->tport_name, tpg->tport_tpgt, |
67e18cf9 AH |
1526 | t->vhost_wwpn, t->vhost_tpgt); |
1527 | ret = -EINVAL; | |
038e0af4 | 1528 | goto err_tpg; |
67e18cf9 | 1529 | } |
98718312 AH |
1530 | tpg->tv_tpg_vhost_count--; |
1531 | tpg->vhost_scsi = NULL; | |
67e18cf9 | 1532 | vs->vs_tpg[target] = NULL; |
4f7f46d3 | 1533 | match = true; |
98718312 | 1534 | mutex_unlock(&tpg->tv_tpg_mutex); |
ab8edab1 NB |
1535 | /* |
1536 | * Release se_tpg->tpg_group.cg_item configfs dependency now | |
1537 | * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur. | |
1538 | */ | |
1539 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1540 | target_undepend_item(&se_tpg->tpg_group.cg_item); |
057cbf49 | 1541 | } |
4f7f46d3 AH |
1542 | if (match) { |
1543 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
3ab2e420 | 1544 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1545 | mutex_lock(&vq->mutex); |
22fa90c7 | 1546 | vq->private_data = NULL; |
4f7f46d3 AH |
1547 | mutex_unlock(&vq->mutex); |
1548 | } | |
1549 | } | |
1550 | /* | |
1551 | * Act as synchronize_rcu to make sure access to | |
1552 | * old vs->vs_tpg is finished. | |
1553 | */ | |
1554 | vhost_scsi_flush(vs); | |
1555 | kfree(vs->vs_tpg); | |
1556 | vs->vs_tpg = NULL; | |
a6c9af87 | 1557 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1558 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1559 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 1560 | return 0; |
101998f6 | 1561 | |
038e0af4 | 1562 | err_tpg: |
98718312 | 1563 | mutex_unlock(&tpg->tv_tpg_mutex); |
038e0af4 | 1564 | err_dev: |
101998f6 | 1565 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1566 | mutex_unlock(&vhost_scsi_mutex); |
101998f6 | 1567 | return ret; |
057cbf49 NB |
1568 | } |
1569 | ||
4f7f46d3 AH |
1570 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1571 | { | |
ea16c514 MT |
1572 | struct vhost_virtqueue *vq; |
1573 | int i; | |
1574 | ||
4f7f46d3 AH |
1575 | if (features & ~VHOST_SCSI_FEATURES) |
1576 | return -EOPNOTSUPP; | |
1577 | ||
1578 | mutex_lock(&vs->dev.mutex); | |
1579 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1580 | !vhost_log_access_ok(&vs->dev)) { | |
1581 | mutex_unlock(&vs->dev.mutex); | |
1582 | return -EFAULT; | |
1583 | } | |
ea16c514 MT |
1584 | |
1585 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
1586 | vq = &vs->vqs[i].vq; | |
1587 | mutex_lock(&vq->mutex); | |
1588 | vq->acked_features = features; | |
1589 | mutex_unlock(&vq->mutex); | |
1590 | } | |
4f7f46d3 AH |
1591 | mutex_unlock(&vs->dev.mutex); |
1592 | return 0; | |
1593 | } | |
1594 | ||
057cbf49 NB |
1595 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1596 | { | |
c7289312 | 1597 | struct vhost_scsi *vs; |
3ab2e420 | 1598 | struct vhost_virtqueue **vqs; |
595cb754 | 1599 | int r = -ENOMEM, i; |
057cbf49 | 1600 | |
dcda9b04 | 1601 | vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_RETRY_MAYFAIL); |
595cb754 MT |
1602 | if (!vs) { |
1603 | vs = vzalloc(sizeof(*vs)); | |
1604 | if (!vs) | |
1605 | goto err_vs; | |
1606 | } | |
057cbf49 | 1607 | |
6da2ec56 | 1608 | vqs = kmalloc_array(VHOST_SCSI_MAX_VQ, sizeof(*vqs), GFP_KERNEL); |
595cb754 MT |
1609 | if (!vqs) |
1610 | goto err_vqs; | |
3ab2e420 | 1611 | |
c7289312 | 1612 | vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); |
1a1ff825 | 1613 | vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work); |
a6c9af87 | 1614 | |
c7289312 AH |
1615 | vs->vs_events_nr = 0; |
1616 | vs->vs_events_missed = false; | |
057cbf49 | 1617 | |
c7289312 AH |
1618 | vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; |
1619 | vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1620 | vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1621 | vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
3ab2e420 | 1622 | for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { |
c7289312 AH |
1623 | vqs[i] = &vs->vqs[i].vq; |
1624 | vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
3ab2e420 | 1625 | } |
59566b6e | 1626 | vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ); |
f2f0173d | 1627 | |
1a1ff825 | 1628 | vhost_scsi_init_inflight(vs, NULL); |
f2f0173d | 1629 | |
c7289312 | 1630 | f->private_data = vs; |
057cbf49 | 1631 | return 0; |
595cb754 | 1632 | |
595cb754 | 1633 | err_vqs: |
68404441 | 1634 | kvfree(vs); |
595cb754 MT |
1635 | err_vs: |
1636 | return r; | |
057cbf49 NB |
1637 | } |
1638 | ||
1639 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1640 | { | |
c7289312 | 1641 | struct vhost_scsi *vs = f->private_data; |
67e18cf9 | 1642 | struct vhost_scsi_target t; |
057cbf49 | 1643 | |
c7289312 AH |
1644 | mutex_lock(&vs->dev.mutex); |
1645 | memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1646 | mutex_unlock(&vs->dev.mutex); | |
1647 | vhost_scsi_clear_endpoint(vs, &t); | |
1648 | vhost_dev_stop(&vs->dev); | |
f6f93f75 | 1649 | vhost_dev_cleanup(&vs->dev); |
a6c9af87 | 1650 | /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
c7289312 AH |
1651 | vhost_scsi_flush(vs); |
1652 | kfree(vs->dev.vqs); | |
68404441 | 1653 | kvfree(vs); |
057cbf49 NB |
1654 | return 0; |
1655 | } | |
1656 | ||
683bd967 AH |
1657 | static long |
1658 | vhost_scsi_ioctl(struct file *f, | |
1659 | unsigned int ioctl, | |
1660 | unsigned long arg) | |
057cbf49 NB |
1661 | { |
1662 | struct vhost_scsi *vs = f->private_data; | |
1663 | struct vhost_scsi_target backend; | |
1664 | void __user *argp = (void __user *)arg; | |
1665 | u64 __user *featurep = argp; | |
11c63418 AH |
1666 | u32 __user *eventsp = argp; |
1667 | u32 events_missed; | |
057cbf49 | 1668 | u64 features; |
101998f6 | 1669 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1670 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1671 | |
1672 | switch (ioctl) { | |
1673 | case VHOST_SCSI_SET_ENDPOINT: | |
1674 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1675 | return -EFAULT; | |
6de7145c MT |
1676 | if (backend.reserved != 0) |
1677 | return -EOPNOTSUPP; | |
057cbf49 NB |
1678 | |
1679 | return vhost_scsi_set_endpoint(vs, &backend); | |
1680 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1681 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1682 | return -EFAULT; | |
6de7145c MT |
1683 | if (backend.reserved != 0) |
1684 | return -EOPNOTSUPP; | |
057cbf49 NB |
1685 | |
1686 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1687 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1688 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1689 | return -EFAULT; |
1690 | return 0; | |
11c63418 AH |
1691 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1692 | if (get_user(events_missed, eventsp)) | |
1693 | return -EFAULT; | |
1694 | mutex_lock(&vq->mutex); | |
1695 | vs->vs_events_missed = events_missed; | |
1696 | mutex_unlock(&vq->mutex); | |
1697 | return 0; | |
1698 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1699 | mutex_lock(&vq->mutex); | |
1700 | events_missed = vs->vs_events_missed; | |
1701 | mutex_unlock(&vq->mutex); | |
1702 | if (put_user(events_missed, eventsp)) | |
1703 | return -EFAULT; | |
1704 | return 0; | |
057cbf49 | 1705 | case VHOST_GET_FEATURES: |
5dade710 | 1706 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1707 | if (copy_to_user(featurep, &features, sizeof features)) |
1708 | return -EFAULT; | |
1709 | return 0; | |
1710 | case VHOST_SET_FEATURES: | |
1711 | if (copy_from_user(&features, featurep, sizeof features)) | |
1712 | return -EFAULT; | |
1713 | return vhost_scsi_set_features(vs, features); | |
1714 | default: | |
1715 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1716 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1717 | /* TODO: flush backend after dev ioctl. */ | |
1718 | if (r == -ENOIOCTLCMD) | |
1719 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1720 | mutex_unlock(&vs->dev.mutex); |
1721 | return r; | |
1722 | } | |
1723 | } | |
1724 | ||
101998f6 NB |
1725 | #ifdef CONFIG_COMPAT |
1726 | static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, | |
1727 | unsigned long arg) | |
1728 | { | |
1729 | return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1730 | } | |
1731 | #endif | |
1732 | ||
057cbf49 NB |
1733 | static const struct file_operations vhost_scsi_fops = { |
1734 | .owner = THIS_MODULE, | |
1735 | .release = vhost_scsi_release, | |
1736 | .unlocked_ioctl = vhost_scsi_ioctl, | |
101998f6 NB |
1737 | #ifdef CONFIG_COMPAT |
1738 | .compat_ioctl = vhost_scsi_compat_ioctl, | |
1739 | #endif | |
057cbf49 NB |
1740 | .open = vhost_scsi_open, |
1741 | .llseek = noop_llseek, | |
1742 | }; | |
1743 | ||
1744 | static struct miscdevice vhost_scsi_misc = { | |
1745 | MISC_DYNAMIC_MINOR, | |
1746 | "vhost-scsi", | |
1747 | &vhost_scsi_fops, | |
1748 | }; | |
1749 | ||
1750 | static int __init vhost_scsi_register(void) | |
1751 | { | |
1752 | return misc_register(&vhost_scsi_misc); | |
1753 | } | |
1754 | ||
f368ed60 | 1755 | static void vhost_scsi_deregister(void) |
057cbf49 | 1756 | { |
f368ed60 | 1757 | misc_deregister(&vhost_scsi_misc); |
057cbf49 NB |
1758 | } |
1759 | ||
1a1ff825 | 1760 | static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport) |
057cbf49 NB |
1761 | { |
1762 | switch (tport->tport_proto_id) { | |
1763 | case SCSI_PROTOCOL_SAS: | |
1764 | return "SAS"; | |
1765 | case SCSI_PROTOCOL_FCP: | |
1766 | return "FCP"; | |
1767 | case SCSI_PROTOCOL_ISCSI: | |
1768 | return "iSCSI"; | |
1769 | default: | |
1770 | break; | |
1771 | } | |
1772 | ||
1773 | return "Unknown"; | |
1774 | } | |
1775 | ||
683bd967 | 1776 | static void |
1a1ff825 | 1777 | vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg, |
683bd967 | 1778 | struct se_lun *lun, bool plug) |
a6c9af87 AH |
1779 | { |
1780 | ||
1781 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1782 | struct vhost_virtqueue *vq; | |
1783 | u32 reason; | |
1784 | ||
1785 | if (!vs) | |
1786 | return; | |
1787 | ||
1788 | mutex_lock(&vs->dev.mutex); | |
a6c9af87 AH |
1789 | |
1790 | if (plug) | |
1791 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1792 | else | |
1793 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1794 | ||
3ab2e420 | 1795 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 | 1796 | mutex_lock(&vq->mutex); |
ea16c514 | 1797 | if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG)) |
1a1ff825 | 1798 | vhost_scsi_send_evt(vs, tpg, lun, |
ea16c514 | 1799 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); |
a6c9af87 AH |
1800 | mutex_unlock(&vq->mutex); |
1801 | mutex_unlock(&vs->dev.mutex); | |
1802 | } | |
1803 | ||
1a1ff825 | 1804 | static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1805 | { |
1a1ff825 | 1806 | vhost_scsi_do_plug(tpg, lun, true); |
a6c9af87 AH |
1807 | } |
1808 | ||
1a1ff825 | 1809 | static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1810 | { |
1a1ff825 | 1811 | vhost_scsi_do_plug(tpg, lun, false); |
a6c9af87 AH |
1812 | } |
1813 | ||
1a1ff825 | 1814 | static int vhost_scsi_port_link(struct se_portal_group *se_tpg, |
683bd967 | 1815 | struct se_lun *lun) |
057cbf49 | 1816 | { |
1a1ff825 NB |
1817 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1818 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1819 | |
1a1ff825 | 1820 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1821 | |
98718312 AH |
1822 | mutex_lock(&tpg->tv_tpg_mutex); |
1823 | tpg->tv_tpg_port_count++; | |
1824 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 | 1825 | |
1a1ff825 | 1826 | vhost_scsi_hotplug(tpg, lun); |
a6c9af87 | 1827 | |
1a1ff825 | 1828 | mutex_unlock(&vhost_scsi_mutex); |
a6c9af87 | 1829 | |
057cbf49 NB |
1830 | return 0; |
1831 | } | |
1832 | ||
1a1ff825 | 1833 | static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg, |
683bd967 | 1834 | struct se_lun *lun) |
057cbf49 | 1835 | { |
1a1ff825 NB |
1836 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1837 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1838 | |
1a1ff825 | 1839 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1840 | |
98718312 AH |
1841 | mutex_lock(&tpg->tv_tpg_mutex); |
1842 | tpg->tv_tpg_port_count--; | |
1843 | mutex_unlock(&tpg->tv_tpg_mutex); | |
a6c9af87 | 1844 | |
1a1ff825 | 1845 | vhost_scsi_hotunplug(tpg, lun); |
a6c9af87 | 1846 | |
1a1ff825 | 1847 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 NB |
1848 | } |
1849 | ||
65ea7898 | 1850 | static void vhost_scsi_free_cmd_map_res(struct se_session *se_sess) |
3aee26b4 | 1851 | { |
1a1ff825 | 1852 | struct vhost_scsi_cmd *tv_cmd; |
3aee26b4 NB |
1853 | unsigned int i; |
1854 | ||
1855 | if (!se_sess->sess_cmd_map) | |
1856 | return; | |
1857 | ||
1a1ff825 NB |
1858 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1859 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 NB |
1860 | |
1861 | kfree(tv_cmd->tvc_sgl); | |
b1935f68 | 1862 | kfree(tv_cmd->tvc_prot_sgl); |
3aee26b4 NB |
1863 | kfree(tv_cmd->tvc_upages); |
1864 | } | |
1865 | } | |
1866 | ||
2eafd729 CH |
1867 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store( |
1868 | struct config_item *item, const char *page, size_t count) | |
b1d75fe5 | 1869 | { |
2eafd729 | 1870 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
b1d75fe5 NB |
1871 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1872 | struct vhost_scsi_tpg, se_tpg); | |
1873 | unsigned long val; | |
1874 | int ret = kstrtoul(page, 0, &val); | |
1875 | ||
1876 | if (ret) { | |
1877 | pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); | |
1878 | return ret; | |
1879 | } | |
1880 | if (val != 0 && val != 1 && val != 3) { | |
1881 | pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val); | |
1882 | return -EINVAL; | |
1883 | } | |
1884 | tpg->tv_fabric_prot_type = val; | |
1885 | ||
1886 | return count; | |
1887 | } | |
1888 | ||
2eafd729 CH |
1889 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show( |
1890 | struct config_item *item, char *page) | |
b1d75fe5 | 1891 | { |
2eafd729 | 1892 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
b1d75fe5 NB |
1893 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1894 | struct vhost_scsi_tpg, se_tpg); | |
1895 | ||
1896 | return sprintf(page, "%d\n", tpg->tv_fabric_prot_type); | |
1897 | } | |
2eafd729 CH |
1898 | |
1899 | CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type); | |
b1d75fe5 NB |
1900 | |
1901 | static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = { | |
2eafd729 | 1902 | &vhost_scsi_tpg_attrib_attr_fabric_prot_type, |
b1d75fe5 NB |
1903 | NULL, |
1904 | }; | |
1905 | ||
65ea7898 NB |
1906 | static int vhost_scsi_nexus_cb(struct se_portal_group *se_tpg, |
1907 | struct se_session *se_sess, void *p) | |
057cbf49 | 1908 | { |
1a1ff825 | 1909 | struct vhost_scsi_cmd *tv_cmd; |
3aee26b4 | 1910 | unsigned int i; |
057cbf49 | 1911 | |
1a1ff825 NB |
1912 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1913 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 | 1914 | |
6396bb22 KC |
1915 | tv_cmd->tvc_sgl = kcalloc(VHOST_SCSI_PREALLOC_SGLS, |
1916 | sizeof(struct scatterlist), | |
1917 | GFP_KERNEL); | |
3aee26b4 | 1918 | if (!tv_cmd->tvc_sgl) { |
3aee26b4 NB |
1919 | pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); |
1920 | goto out; | |
1921 | } | |
1922 | ||
6396bb22 KC |
1923 | tv_cmd->tvc_upages = kcalloc(VHOST_SCSI_PREALLOC_UPAGES, |
1924 | sizeof(struct page *), | |
1925 | GFP_KERNEL); | |
3aee26b4 | 1926 | if (!tv_cmd->tvc_upages) { |
3aee26b4 NB |
1927 | pr_err("Unable to allocate tv_cmd->tvc_upages\n"); |
1928 | goto out; | |
1929 | } | |
b1935f68 | 1930 | |
6396bb22 KC |
1931 | tv_cmd->tvc_prot_sgl = kcalloc(VHOST_SCSI_PREALLOC_PROT_SGLS, |
1932 | sizeof(struct scatterlist), | |
1933 | GFP_KERNEL); | |
b1935f68 | 1934 | if (!tv_cmd->tvc_prot_sgl) { |
b1935f68 NB |
1935 | pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); |
1936 | goto out; | |
1937 | } | |
3aee26b4 | 1938 | } |
65ea7898 NB |
1939 | return 0; |
1940 | out: | |
1941 | vhost_scsi_free_cmd_map_res(se_sess); | |
1942 | return -ENOMEM; | |
1943 | } | |
1944 | ||
1945 | static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg, | |
1946 | const char *name) | |
1947 | { | |
65ea7898 NB |
1948 | struct vhost_scsi_nexus *tv_nexus; |
1949 | ||
1950 | mutex_lock(&tpg->tv_tpg_mutex); | |
1951 | if (tpg->tpg_nexus) { | |
1952 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1953 | pr_debug("tpg->tpg_nexus already exists\n"); | |
1954 | return -EEXIST; | |
1955 | } | |
65ea7898 | 1956 | |
473f0b15 | 1957 | tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); |
65ea7898 NB |
1958 | if (!tv_nexus) { |
1959 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1960 | pr_err("Unable to allocate struct vhost_scsi_nexus\n"); | |
1961 | return -ENOMEM; | |
1962 | } | |
057cbf49 NB |
1963 | /* |
1964 | * Since we are running in 'demo mode' this call with generate a | |
1a1ff825 | 1965 | * struct se_node_acl for the vhost_scsi struct se_portal_group with |
057cbf49 NB |
1966 | * the SCSI Initiator port name of the passed configfs group 'name'. |
1967 | */ | |
fa834287 | 1968 | tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, |
65ea7898 NB |
1969 | VHOST_SCSI_DEFAULT_TAGS, |
1970 | sizeof(struct vhost_scsi_cmd), | |
1971 | TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS, | |
1972 | (unsigned char *)name, tv_nexus, | |
1973 | vhost_scsi_nexus_cb); | |
1974 | if (IS_ERR(tv_nexus->tvn_se_sess)) { | |
98718312 | 1975 | mutex_unlock(&tpg->tv_tpg_mutex); |
65ea7898 NB |
1976 | kfree(tv_nexus); |
1977 | return -ENOMEM; | |
057cbf49 | 1978 | } |
98718312 | 1979 | tpg->tpg_nexus = tv_nexus; |
057cbf49 | 1980 | |
98718312 | 1981 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1982 | return 0; |
1983 | } | |
1984 | ||
1a1ff825 | 1985 | static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg) |
057cbf49 NB |
1986 | { |
1987 | struct se_session *se_sess; | |
1a1ff825 | 1988 | struct vhost_scsi_nexus *tv_nexus; |
057cbf49 NB |
1989 | |
1990 | mutex_lock(&tpg->tv_tpg_mutex); | |
1991 | tv_nexus = tpg->tpg_nexus; | |
1992 | if (!tv_nexus) { | |
1993 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1994 | return -ENODEV; | |
1995 | } | |
1996 | ||
1997 | se_sess = tv_nexus->tvn_se_sess; | |
1998 | if (!se_sess) { | |
1999 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2000 | return -ENODEV; | |
2001 | } | |
2002 | ||
101998f6 | 2003 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 2004 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 2005 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 2006 | " active TPG port count: %d\n", |
101998f6 NB |
2007 | tpg->tv_tpg_port_count); |
2008 | return -EBUSY; | |
057cbf49 NB |
2009 | } |
2010 | ||
101998f6 | 2011 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 2012 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 2013 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 2014 | " active TPG vhost count: %d\n", |
101998f6 NB |
2015 | tpg->tv_tpg_vhost_count); |
2016 | return -EBUSY; | |
057cbf49 NB |
2017 | } |
2018 | ||
101998f6 | 2019 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
1a1ff825 | 2020 | " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport), |
057cbf49 | 2021 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
3aee26b4 | 2022 | |
65ea7898 | 2023 | vhost_scsi_free_cmd_map_res(se_sess); |
057cbf49 | 2024 | /* |
101998f6 | 2025 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 | 2026 | */ |
25b88550 | 2027 | target_remove_session(se_sess); |
057cbf49 NB |
2028 | tpg->tpg_nexus = NULL; |
2029 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2030 | ||
2031 | kfree(tv_nexus); | |
2032 | return 0; | |
2033 | } | |
2034 | ||
2eafd729 | 2035 | static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page) |
057cbf49 | 2036 | { |
2eafd729 | 2037 | struct se_portal_group *se_tpg = to_tpg(item); |
1a1ff825 NB |
2038 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2039 | struct vhost_scsi_tpg, se_tpg); | |
2040 | struct vhost_scsi_nexus *tv_nexus; | |
057cbf49 NB |
2041 | ssize_t ret; |
2042 | ||
98718312 AH |
2043 | mutex_lock(&tpg->tv_tpg_mutex); |
2044 | tv_nexus = tpg->tpg_nexus; | |
057cbf49 | 2045 | if (!tv_nexus) { |
98718312 | 2046 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2047 | return -ENODEV; |
2048 | } | |
2049 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
2050 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
98718312 | 2051 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2052 | |
2053 | return ret; | |
2054 | } | |
2055 | ||
2eafd729 CH |
2056 | static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item, |
2057 | const char *page, size_t count) | |
057cbf49 | 2058 | { |
2eafd729 | 2059 | struct se_portal_group *se_tpg = to_tpg(item); |
1a1ff825 NB |
2060 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2061 | struct vhost_scsi_tpg, se_tpg); | |
2062 | struct vhost_scsi_tport *tport_wwn = tpg->tport; | |
2063 | unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr; | |
057cbf49 NB |
2064 | int ret; |
2065 | /* | |
2066 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
2067 | */ | |
2068 | if (!strncmp(page, "NULL", 4)) { | |
1a1ff825 | 2069 | ret = vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
2070 | return (!ret) ? count : ret; |
2071 | } | |
2072 | /* | |
2073 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1a1ff825 NB |
2074 | * the fabric protocol_id set in vhost_scsi_make_tport(), and call |
2075 | * vhost_scsi_make_nexus(). | |
057cbf49 | 2076 | */ |
1a1ff825 | 2077 | if (strlen(page) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2078 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
1a1ff825 | 2079 | " max: %d\n", page, VHOST_SCSI_NAMELEN); |
057cbf49 NB |
2080 | return -EINVAL; |
2081 | } | |
1a1ff825 | 2082 | snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page); |
057cbf49 NB |
2083 | |
2084 | ptr = strstr(i_port, "naa."); | |
2085 | if (ptr) { | |
2086 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
2087 | pr_err("Passed SAS Initiator Port %s does not" | |
2088 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2089 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2090 | return -EINVAL; |
2091 | } | |
2092 | port_ptr = &i_port[0]; | |
2093 | goto check_newline; | |
2094 | } | |
2095 | ptr = strstr(i_port, "fc."); | |
2096 | if (ptr) { | |
2097 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
2098 | pr_err("Passed FCP Initiator Port %s does not" | |
2099 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2100 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2101 | return -EINVAL; |
2102 | } | |
2103 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
2104 | goto check_newline; | |
2105 | } | |
2106 | ptr = strstr(i_port, "iqn."); | |
2107 | if (ptr) { | |
2108 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
2109 | pr_err("Passed iSCSI Initiator Port %s does not" | |
2110 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2111 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2112 | return -EINVAL; |
2113 | } | |
2114 | port_ptr = &i_port[0]; | |
2115 | goto check_newline; | |
2116 | } | |
2117 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
2118 | " %s\n", i_port); | |
2119 | return -EINVAL; | |
2120 | /* | |
2121 | * Clear any trailing newline for the NAA WWN | |
2122 | */ | |
2123 | check_newline: | |
2124 | if (i_port[strlen(i_port)-1] == '\n') | |
2125 | i_port[strlen(i_port)-1] = '\0'; | |
2126 | ||
1a1ff825 | 2127 | ret = vhost_scsi_make_nexus(tpg, port_ptr); |
057cbf49 NB |
2128 | if (ret < 0) |
2129 | return ret; | |
2130 | ||
2131 | return count; | |
2132 | } | |
2133 | ||
2eafd729 | 2134 | CONFIGFS_ATTR(vhost_scsi_tpg_, nexus); |
057cbf49 | 2135 | |
1a1ff825 | 2136 | static struct configfs_attribute *vhost_scsi_tpg_attrs[] = { |
2eafd729 | 2137 | &vhost_scsi_tpg_attr_nexus, |
057cbf49 NB |
2138 | NULL, |
2139 | }; | |
2140 | ||
683bd967 | 2141 | static struct se_portal_group * |
aa090eab | 2142 | vhost_scsi_make_tpg(struct se_wwn *wwn, const char *name) |
057cbf49 | 2143 | { |
1a1ff825 NB |
2144 | struct vhost_scsi_tport *tport = container_of(wwn, |
2145 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 | 2146 | |
1a1ff825 | 2147 | struct vhost_scsi_tpg *tpg; |
59c816c1 | 2148 | u16 tpgt; |
057cbf49 NB |
2149 | int ret; |
2150 | ||
2151 | if (strstr(name, "tpgt_") != name) | |
2152 | return ERR_PTR(-EINVAL); | |
59c816c1 | 2153 | if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET) |
057cbf49 NB |
2154 | return ERR_PTR(-EINVAL); |
2155 | ||
473f0b15 | 2156 | tpg = kzalloc(sizeof(*tpg), GFP_KERNEL); |
057cbf49 | 2157 | if (!tpg) { |
1a1ff825 | 2158 | pr_err("Unable to allocate struct vhost_scsi_tpg"); |
057cbf49 NB |
2159 | return ERR_PTR(-ENOMEM); |
2160 | } | |
2161 | mutex_init(&tpg->tv_tpg_mutex); | |
2162 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
2163 | tpg->tport = tport; | |
2164 | tpg->tport_tpgt = tpgt; | |
2165 | ||
bc0c94b1 | 2166 | ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id); |
057cbf49 NB |
2167 | if (ret < 0) { |
2168 | kfree(tpg); | |
2169 | return NULL; | |
2170 | } | |
1a1ff825 NB |
2171 | mutex_lock(&vhost_scsi_mutex); |
2172 | list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list); | |
2173 | mutex_unlock(&vhost_scsi_mutex); | |
057cbf49 NB |
2174 | |
2175 | return &tpg->se_tpg; | |
2176 | } | |
2177 | ||
1a1ff825 | 2178 | static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg) |
057cbf49 | 2179 | { |
1a1ff825 NB |
2180 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2181 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 2182 | |
1a1ff825 | 2183 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 2184 | list_del(&tpg->tv_tpg_list); |
1a1ff825 | 2185 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 2186 | /* |
101998f6 | 2187 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 | 2188 | */ |
1a1ff825 | 2189 | vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
2190 | /* |
2191 | * Deregister the se_tpg from TCM.. | |
2192 | */ | |
2193 | core_tpg_deregister(se_tpg); | |
2194 | kfree(tpg); | |
2195 | } | |
2196 | ||
683bd967 | 2197 | static struct se_wwn * |
1a1ff825 | 2198 | vhost_scsi_make_tport(struct target_fabric_configfs *tf, |
683bd967 AH |
2199 | struct config_group *group, |
2200 | const char *name) | |
057cbf49 | 2201 | { |
1a1ff825 | 2202 | struct vhost_scsi_tport *tport; |
057cbf49 NB |
2203 | char *ptr; |
2204 | u64 wwpn = 0; | |
2205 | int off = 0; | |
2206 | ||
1a1ff825 | 2207 | /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0) |
057cbf49 NB |
2208 | return ERR_PTR(-EINVAL); */ |
2209 | ||
473f0b15 | 2210 | tport = kzalloc(sizeof(*tport), GFP_KERNEL); |
057cbf49 | 2211 | if (!tport) { |
1a1ff825 | 2212 | pr_err("Unable to allocate struct vhost_scsi_tport"); |
057cbf49 NB |
2213 | return ERR_PTR(-ENOMEM); |
2214 | } | |
2215 | tport->tport_wwpn = wwpn; | |
2216 | /* | |
2217 | * Determine the emulated Protocol Identifier and Target Port Name | |
2218 | * based on the incoming configfs directory name. | |
2219 | */ | |
2220 | ptr = strstr(name, "naa."); | |
2221 | if (ptr) { | |
2222 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
2223 | goto check_len; | |
2224 | } | |
2225 | ptr = strstr(name, "fc."); | |
2226 | if (ptr) { | |
2227 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
2228 | off = 3; /* Skip over "fc." */ | |
2229 | goto check_len; | |
2230 | } | |
2231 | ptr = strstr(name, "iqn."); | |
2232 | if (ptr) { | |
2233 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
2234 | goto check_len; | |
2235 | } | |
2236 | ||
2237 | pr_err("Unable to locate prefix for emulated Target Port:" | |
2238 | " %s\n", name); | |
2239 | kfree(tport); | |
2240 | return ERR_PTR(-EINVAL); | |
2241 | ||
2242 | check_len: | |
1a1ff825 | 2243 | if (strlen(name) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2244 | pr_err("Emulated %s Address: %s, exceeds" |
1a1ff825 NB |
2245 | " max: %d\n", name, vhost_scsi_dump_proto_id(tport), |
2246 | VHOST_SCSI_NAMELEN); | |
057cbf49 NB |
2247 | kfree(tport); |
2248 | return ERR_PTR(-EINVAL); | |
2249 | } | |
1a1ff825 | 2250 | snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]); |
057cbf49 NB |
2251 | |
2252 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
1a1ff825 | 2253 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name); |
057cbf49 NB |
2254 | |
2255 | return &tport->tport_wwn; | |
2256 | } | |
2257 | ||
1a1ff825 | 2258 | static void vhost_scsi_drop_tport(struct se_wwn *wwn) |
057cbf49 | 2259 | { |
1a1ff825 NB |
2260 | struct vhost_scsi_tport *tport = container_of(wwn, |
2261 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 NB |
2262 | |
2263 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
1a1ff825 | 2264 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), |
057cbf49 NB |
2265 | tport->tport_name); |
2266 | ||
2267 | kfree(tport); | |
2268 | } | |
2269 | ||
683bd967 | 2270 | static ssize_t |
2eafd729 | 2271 | vhost_scsi_wwn_version_show(struct config_item *item, char *page) |
057cbf49 NB |
2272 | { |
2273 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" | |
1a1ff825 | 2274 | "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 NB |
2275 | utsname()->machine); |
2276 | } | |
2277 | ||
2eafd729 | 2278 | CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version); |
057cbf49 | 2279 | |
1a1ff825 | 2280 | static struct configfs_attribute *vhost_scsi_wwn_attrs[] = { |
2eafd729 | 2281 | &vhost_scsi_wwn_attr_version, |
057cbf49 NB |
2282 | NULL, |
2283 | }; | |
2284 | ||
1d822a40 | 2285 | static const struct target_core_fabric_ops vhost_scsi_ops = { |
9ac8928e | 2286 | .module = THIS_MODULE, |
30c7ca93 | 2287 | .fabric_name = "vhost", |
1a1ff825 NB |
2288 | .tpg_get_wwn = vhost_scsi_get_fabric_wwn, |
2289 | .tpg_get_tag = vhost_scsi_get_tpgt, | |
1a1ff825 NB |
2290 | .tpg_check_demo_mode = vhost_scsi_check_true, |
2291 | .tpg_check_demo_mode_cache = vhost_scsi_check_true, | |
2292 | .tpg_check_demo_mode_write_protect = vhost_scsi_check_false, | |
2293 | .tpg_check_prod_mode_write_protect = vhost_scsi_check_false, | |
b1d75fe5 | 2294 | .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only, |
1a1ff825 NB |
2295 | .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index, |
2296 | .release_cmd = vhost_scsi_release_cmd, | |
084ed45b | 2297 | .check_stop_free = vhost_scsi_check_stop_free, |
1a1ff825 | 2298 | .sess_get_index = vhost_scsi_sess_get_index, |
057cbf49 | 2299 | .sess_get_initiator_sid = NULL, |
1a1ff825 NB |
2300 | .write_pending = vhost_scsi_write_pending, |
2301 | .write_pending_status = vhost_scsi_write_pending_status, | |
2302 | .set_default_node_attributes = vhost_scsi_set_default_node_attrs, | |
1a1ff825 NB |
2303 | .get_cmd_state = vhost_scsi_get_cmd_state, |
2304 | .queue_data_in = vhost_scsi_queue_data_in, | |
2305 | .queue_status = vhost_scsi_queue_status, | |
2306 | .queue_tm_rsp = vhost_scsi_queue_tm_rsp, | |
2307 | .aborted_task = vhost_scsi_aborted_task, | |
057cbf49 NB |
2308 | /* |
2309 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
2310 | */ | |
1a1ff825 NB |
2311 | .fabric_make_wwn = vhost_scsi_make_tport, |
2312 | .fabric_drop_wwn = vhost_scsi_drop_tport, | |
2313 | .fabric_make_tpg = vhost_scsi_make_tpg, | |
2314 | .fabric_drop_tpg = vhost_scsi_drop_tpg, | |
2315 | .fabric_post_link = vhost_scsi_port_link, | |
2316 | .fabric_pre_unlink = vhost_scsi_port_unlink, | |
9ac8928e CH |
2317 | |
2318 | .tfc_wwn_attrs = vhost_scsi_wwn_attrs, | |
2319 | .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs, | |
2320 | .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs, | |
057cbf49 NB |
2321 | }; |
2322 | ||
9ac8928e | 2323 | static int __init vhost_scsi_init(void) |
057cbf49 | 2324 | { |
9ac8928e | 2325 | int ret = -ENOMEM; |
057cbf49 | 2326 | |
9ac8928e | 2327 | pr_debug("TCM_VHOST fabric module %s on %s/%s" |
1a1ff825 | 2328 | " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 | 2329 | utsname()->machine); |
057cbf49 | 2330 | |
101998f6 NB |
2331 | /* |
2332 | * Use our own dedicated workqueue for submitting I/O into | |
2333 | * target core to avoid contention within system_wq. | |
2334 | */ | |
1a1ff825 NB |
2335 | vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0); |
2336 | if (!vhost_scsi_workqueue) | |
057cbf49 NB |
2337 | goto out; |
2338 | ||
2339 | ret = vhost_scsi_register(); | |
2340 | if (ret < 0) | |
2341 | goto out_destroy_workqueue; | |
2342 | ||
9ac8928e | 2343 | ret = target_register_template(&vhost_scsi_ops); |
057cbf49 NB |
2344 | if (ret < 0) |
2345 | goto out_vhost_scsi_deregister; | |
2346 | ||
2347 | return 0; | |
2348 | ||
2349 | out_vhost_scsi_deregister: | |
2350 | vhost_scsi_deregister(); | |
2351 | out_destroy_workqueue: | |
1a1ff825 | 2352 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2353 | out: |
2354 | return ret; | |
2355 | }; | |
2356 | ||
1a1ff825 | 2357 | static void vhost_scsi_exit(void) |
057cbf49 | 2358 | { |
9ac8928e | 2359 | target_unregister_template(&vhost_scsi_ops); |
057cbf49 | 2360 | vhost_scsi_deregister(); |
1a1ff825 | 2361 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2362 | }; |
2363 | ||
181c04a3 MT |
2364 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
2365 | MODULE_ALIAS("tcm_vhost"); | |
057cbf49 | 2366 | MODULE_LICENSE("GPL"); |
1a1ff825 NB |
2367 | module_init(vhost_scsi_init); |
2368 | module_exit(vhost_scsi_exit); |