Commit | Line | Data |
---|---|---|
057cbf49 NB |
1 | /******************************************************************************* |
2 | * Vhost kernel TCM fabric driver for virtio SCSI initiators | |
3 | * | |
4c76251e | 4 | * (C) Copyright 2010-2013 Datera, Inc. |
057cbf49 NB |
5 | * (C) Copyright 2010-2012 IBM Corp. |
6 | * | |
7 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. | |
8 | * | |
4c76251e | 9 | * Authors: Nicholas A. Bellinger <nab@daterainc.com> |
057cbf49 NB |
10 | * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | ****************************************************************************/ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/moduleparam.h> | |
26 | #include <generated/utsrelease.h> | |
27 | #include <linux/utsname.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/kthread.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/configfs.h> | |
34 | #include <linux/ctype.h> | |
35 | #include <linux/compat.h> | |
36 | #include <linux/eventfd.h> | |
057cbf49 | 37 | #include <linux/fs.h> |
5538d294 | 38 | #include <linux/vmalloc.h> |
057cbf49 NB |
39 | #include <linux/miscdevice.h> |
40 | #include <asm/unaligned.h> | |
ba929992 BVA |
41 | #include <scsi/scsi_common.h> |
42 | #include <scsi/scsi_proto.h> | |
057cbf49 NB |
43 | #include <target/target_core_base.h> |
44 | #include <target/target_core_fabric.h> | |
057cbf49 | 45 | #include <linux/vhost.h> |
057cbf49 | 46 | #include <linux/virtio_scsi.h> |
9d6064a3 | 47 | #include <linux/llist.h> |
1b7f390e | 48 | #include <linux/bitmap.h> |
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 void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl) |
057cbf49 NB |
350 | { |
351 | return; | |
352 | } | |
353 | ||
1a1ff825 | 354 | static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd) |
057cbf49 NB |
355 | { |
356 | return 0; | |
357 | } | |
358 | ||
1a1ff825 | 359 | static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd) |
101998f6 | 360 | { |
3c63f66a | 361 | struct vhost_scsi *vs = cmd->tvc_vhost; |
101998f6 | 362 | |
3c63f66a | 363 | llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
101998f6 NB |
364 | |
365 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
366 | } | |
057cbf49 | 367 | |
1a1ff825 | 368 | static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd) |
057cbf49 | 369 | { |
1a1ff825 NB |
370 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
371 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 372 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
373 | return 0; |
374 | } | |
375 | ||
1a1ff825 | 376 | static int vhost_scsi_queue_status(struct se_cmd *se_cmd) |
057cbf49 | 377 | { |
1a1ff825 NB |
378 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
379 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 380 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
381 | return 0; |
382 | } | |
383 | ||
1a1ff825 | 384 | static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd) |
057cbf49 | 385 | { |
b79fafac | 386 | return; |
057cbf49 NB |
387 | } |
388 | ||
1a1ff825 | 389 | static void vhost_scsi_aborted_task(struct se_cmd *se_cmd) |
131e6abc NB |
390 | { |
391 | return; | |
392 | } | |
393 | ||
1a1ff825 | 394 | static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 AH |
395 | { |
396 | vs->vs_events_nr--; | |
397 | kfree(evt); | |
398 | } | |
399 | ||
1a1ff825 NB |
400 | static struct vhost_scsi_evt * |
401 | vhost_scsi_allocate_evt(struct vhost_scsi *vs, | |
683bd967 | 402 | u32 event, u32 reason) |
a6c9af87 | 403 | { |
3ab2e420 | 404 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
1a1ff825 | 405 | struct vhost_scsi_evt *evt; |
a6c9af87 AH |
406 | |
407 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
408 | vs->vs_events_missed = true; | |
409 | return NULL; | |
410 | } | |
411 | ||
412 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
413 | if (!evt) { | |
1a1ff825 | 414 | vq_err(vq, "Failed to allocate vhost_scsi_evt\n"); |
a6c9af87 AH |
415 | vs->vs_events_missed = true; |
416 | return NULL; | |
417 | } | |
418 | ||
e72fd72e MT |
419 | evt->event.event = cpu_to_vhost32(vq, event); |
420 | evt->event.reason = cpu_to_vhost32(vq, reason); | |
a6c9af87 AH |
421 | vs->vs_events_nr++; |
422 | ||
423 | return evt; | |
424 | } | |
425 | ||
1a1ff825 | 426 | static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd) |
057cbf49 | 427 | { |
3c63f66a | 428 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
429 | |
430 | /* TODO locking against target/backend threads? */ | |
6c131d0c | 431 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 432 | |
084ed45b | 433 | } |
f2f0173d | 434 | |
084ed45b NB |
435 | static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) |
436 | { | |
afc16604 | 437 | return target_put_sess_cmd(se_cmd); |
057cbf49 NB |
438 | } |
439 | ||
683bd967 | 440 | static void |
1a1ff825 | 441 | vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 | 442 | { |
3ab2e420 | 443 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
444 | struct virtio_scsi_event *event = &evt->event; |
445 | struct virtio_scsi_event __user *eventp; | |
446 | unsigned out, in; | |
447 | int head, ret; | |
448 | ||
449 | if (!vq->private_data) { | |
450 | vs->vs_events_missed = true; | |
451 | return; | |
452 | } | |
453 | ||
454 | again: | |
455 | vhost_disable_notify(&vs->dev, vq); | |
47283bef | 456 | head = vhost_get_vq_desc(vq, vq->iov, |
a6c9af87 AH |
457 | ARRAY_SIZE(vq->iov), &out, &in, |
458 | NULL, NULL); | |
459 | if (head < 0) { | |
460 | vs->vs_events_missed = true; | |
461 | return; | |
462 | } | |
463 | if (head == vq->num) { | |
464 | if (vhost_enable_notify(&vs->dev, vq)) | |
465 | goto again; | |
466 | vs->vs_events_missed = true; | |
467 | return; | |
468 | } | |
469 | ||
470 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { | |
471 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", | |
472 | vq->iov[out].iov_len); | |
473 | vs->vs_events_missed = true; | |
474 | return; | |
475 | } | |
476 | ||
477 | if (vs->vs_events_missed) { | |
e72fd72e | 478 | event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED); |
a6c9af87 AH |
479 | vs->vs_events_missed = false; |
480 | } | |
481 | ||
482 | eventp = vq->iov[out].iov_base; | |
483 | ret = __copy_to_user(eventp, event, sizeof(*event)); | |
484 | if (!ret) | |
485 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
486 | else | |
1a1ff825 | 487 | vq_err(vq, "Faulted on vhost_scsi_send_event\n"); |
a6c9af87 AH |
488 | } |
489 | ||
1a1ff825 | 490 | static void vhost_scsi_evt_work(struct vhost_work *work) |
a6c9af87 AH |
491 | { |
492 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
493 | vs_event_work); | |
3ab2e420 | 494 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
12bdcbd5 | 495 | struct vhost_scsi_evt *evt, *t; |
a6c9af87 AH |
496 | struct llist_node *llnode; |
497 | ||
498 | mutex_lock(&vq->mutex); | |
499 | llnode = llist_del_all(&vs->vs_event_list); | |
12bdcbd5 | 500 | llist_for_each_entry_safe(evt, t, llnode, list) { |
1a1ff825 NB |
501 | vhost_scsi_do_evt_work(vs, evt); |
502 | vhost_scsi_free_evt(vs, evt); | |
a6c9af87 AH |
503 | } |
504 | mutex_unlock(&vq->mutex); | |
505 | } | |
506 | ||
057cbf49 NB |
507 | /* Fill in status and signal that we are done processing this command |
508 | * | |
509 | * This is scheduled in the vhost work queue so we are called with the owner | |
510 | * process mm and can access the vring. | |
511 | */ | |
512 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) | |
513 | { | |
514 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
515 | vs_completion_work); | |
1b7f390e | 516 | DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 517 | struct virtio_scsi_cmd_resp v_rsp; |
816e85ed | 518 | struct vhost_scsi_cmd *cmd, *t; |
9d6064a3 AH |
519 | struct llist_node *llnode; |
520 | struct se_cmd *se_cmd; | |
79c14141 | 521 | struct iov_iter iov_iter; |
1b7f390e | 522 | int ret, vq; |
057cbf49 | 523 | |
1b7f390e | 524 | bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 525 | llnode = llist_del_all(&vs->vs_completion_list); |
816e85ed | 526 | llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) { |
3c63f66a | 527 | se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
528 | |
529 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
3c63f66a | 530 | cmd, se_cmd->residual_count, se_cmd->scsi_status); |
057cbf49 NB |
531 | |
532 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
e72fd72e | 533 | v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count); |
057cbf49 NB |
534 | /* TODO is status_qualifier field needed? */ |
535 | v_rsp.status = se_cmd->scsi_status; | |
e72fd72e MT |
536 | v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq, |
537 | se_cmd->scsi_sense_length); | |
3c63f66a | 538 | memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
e72fd72e | 539 | se_cmd->scsi_sense_length); |
79c14141 | 540 | |
a77ec83a | 541 | iov_iter_init(&iov_iter, READ, &cmd->tvc_resp_iov, |
79c14141 NB |
542 | cmd->tvc_in_iovs, sizeof(v_rsp)); |
543 | ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter); | |
544 | if (likely(ret == sizeof(v_rsp))) { | |
3ab2e420 | 545 | struct vhost_scsi_virtqueue *q; |
3c63f66a AH |
546 | vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
547 | q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); | |
3ab2e420 | 548 | vq = q - vs->vqs; |
1b7f390e AH |
549 | __set_bit(vq, signal); |
550 | } else | |
057cbf49 NB |
551 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
552 | ||
3c63f66a | 553 | vhost_scsi_free_cmd(cmd); |
057cbf49 NB |
554 | } |
555 | ||
1b7f390e AH |
556 | vq = -1; |
557 | while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) | |
558 | < VHOST_SCSI_MAX_VQ) | |
3ab2e420 | 559 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
560 | } |
561 | ||
1a1ff825 NB |
562 | static struct vhost_scsi_cmd * |
563 | vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg, | |
95e7c434 NB |
564 | unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr, |
565 | u32 exp_data_len, int data_direction) | |
057cbf49 | 566 | { |
1a1ff825 NB |
567 | struct vhost_scsi_cmd *cmd; |
568 | struct vhost_scsi_nexus *tv_nexus; | |
4824d3bf | 569 | struct se_session *se_sess; |
b1935f68 | 570 | struct scatterlist *sg, *prot_sg; |
3aee26b4 | 571 | struct page **pages; |
10e9cbb6 | 572 | int tag, cpu; |
057cbf49 | 573 | |
98718312 | 574 | tv_nexus = tpg->tpg_nexus; |
057cbf49 | 575 | if (!tv_nexus) { |
1a1ff825 | 576 | pr_err("Unable to locate active struct vhost_scsi_nexus\n"); |
057cbf49 NB |
577 | return ERR_PTR(-EIO); |
578 | } | |
4824d3bf | 579 | se_sess = tv_nexus->tvn_se_sess; |
057cbf49 | 580 | |
10e9cbb6 | 581 | tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); |
4a47d3a1 | 582 | if (tag < 0) { |
1a1ff825 | 583 | pr_err("Unable to obtain tag for vhost_scsi_cmd\n"); |
4a47d3a1 NB |
584 | return ERR_PTR(-ENOMEM); |
585 | } | |
586 | ||
1a1ff825 | 587 | cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag]; |
3aee26b4 | 588 | sg = cmd->tvc_sgl; |
b1935f68 | 589 | prot_sg = cmd->tvc_prot_sgl; |
3aee26b4 | 590 | pages = cmd->tvc_upages; |
473f0b15 | 591 | memset(cmd, 0, sizeof(*cmd)); |
3aee26b4 | 592 | cmd->tvc_sgl = sg; |
b1935f68 | 593 | cmd->tvc_prot_sgl = prot_sg; |
3aee26b4 | 594 | cmd->tvc_upages = pages; |
4824d3bf | 595 | cmd->tvc_se_cmd.map_tag = tag; |
10e9cbb6 | 596 | cmd->tvc_se_cmd.map_cpu = cpu; |
95e7c434 NB |
597 | cmd->tvc_tag = scsi_tag; |
598 | cmd->tvc_lun = lun; | |
599 | cmd->tvc_task_attr = task_attr; | |
3c63f66a AH |
600 | cmd->tvc_exp_data_len = exp_data_len; |
601 | cmd->tvc_data_direction = data_direction; | |
602 | cmd->tvc_nexus = tv_nexus; | |
1a1ff825 | 603 | cmd->inflight = vhost_scsi_get_inflight(vq); |
3c63f66a | 604 | |
1a1ff825 | 605 | memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE); |
95e7c434 | 606 | |
3c63f66a | 607 | return cmd; |
057cbf49 NB |
608 | } |
609 | ||
610 | /* | |
611 | * Map a user memory range into a scatterlist | |
612 | * | |
613 | * Returns the number of scatterlist entries used or -errno on error. | |
614 | */ | |
683bd967 | 615 | static int |
1a1ff825 | 616 | vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd, |
2f240c4a | 617 | struct iov_iter *iter, |
3aee26b4 | 618 | struct scatterlist *sgl, |
5a01d082 | 619 | bool write) |
057cbf49 | 620 | { |
b4078b5f | 621 | struct page **pages = cmd->tvc_upages; |
2f240c4a AV |
622 | struct scatterlist *sg = sgl; |
623 | ssize_t bytes; | |
624 | size_t offset; | |
625 | unsigned int npages = 0; | |
3aee26b4 | 626 | |
2f240c4a AV |
627 | bytes = iov_iter_get_pages(iter, pages, LONG_MAX, |
628 | VHOST_SCSI_PREALLOC_UPAGES, &offset); | |
1810053e | 629 | /* No pages were pinned */ |
2f240c4a AV |
630 | if (bytes <= 0) |
631 | return bytes < 0 ? bytes : -EFAULT; | |
1810053e | 632 | |
2f240c4a | 633 | iov_iter_advance(iter, bytes); |
057cbf49 | 634 | |
2f240c4a AV |
635 | while (bytes) { |
636 | unsigned n = min_t(unsigned, PAGE_SIZE - offset, bytes); | |
637 | sg_set_page(sg++, pages[npages++], n, offset); | |
638 | bytes -= n; | |
639 | offset = 0; | |
640 | } | |
641 | return npages; | |
057cbf49 NB |
642 | } |
643 | ||
683bd967 | 644 | static int |
e8de56b5 | 645 | vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls) |
057cbf49 | 646 | { |
e8de56b5 | 647 | int sgl_count = 0; |
057cbf49 | 648 | |
e8de56b5 NB |
649 | if (!iter || !iter->iov) { |
650 | pr_err("%s: iter->iov is NULL, but expected bytes: %zu" | |
651 | " present\n", __func__, bytes); | |
652 | return -EINVAL; | |
653 | } | |
f3158f36 | 654 | |
e8de56b5 NB |
655 | sgl_count = iov_iter_npages(iter, 0xffff); |
656 | if (sgl_count > max_sgls) { | |
657 | pr_err("%s: requested sgl_count: %d exceeds pre-allocated" | |
658 | " max_sgls: %d\n", __func__, sgl_count, max_sgls); | |
659 | return -EINVAL; | |
5a01d082 | 660 | } |
e8de56b5 NB |
661 | return sgl_count; |
662 | } | |
057cbf49 | 663 | |
e8de56b5 | 664 | static int |
1a1ff825 NB |
665 | vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write, |
666 | struct iov_iter *iter, | |
667 | struct scatterlist *sg, int sg_count) | |
e8de56b5 | 668 | { |
11d49e9d | 669 | struct scatterlist *p = sg; |
2f240c4a | 670 | int ret; |
5a01d082 | 671 | |
2f240c4a AV |
672 | while (iov_iter_count(iter)) { |
673 | ret = vhost_scsi_map_to_sgl(cmd, iter, sg, write); | |
057cbf49 | 674 | if (ret < 0) { |
11d49e9d AV |
675 | while (p < sg) { |
676 | struct page *page = sg_page(p++); | |
e8de56b5 NB |
677 | if (page) |
678 | put_page(page); | |
679 | } | |
057cbf49 NB |
680 | return ret; |
681 | } | |
057cbf49 | 682 | sg += ret; |
057cbf49 NB |
683 | } |
684 | return 0; | |
685 | } | |
686 | ||
e31885dd | 687 | static int |
1a1ff825 | 688 | vhost_scsi_mapal(struct vhost_scsi_cmd *cmd, |
e8de56b5 NB |
689 | size_t prot_bytes, struct iov_iter *prot_iter, |
690 | size_t data_bytes, struct iov_iter *data_iter) | |
691 | { | |
692 | int sgl_count, ret; | |
693 | bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE); | |
694 | ||
695 | if (prot_bytes) { | |
696 | sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes, | |
1a1ff825 | 697 | VHOST_SCSI_PREALLOC_PROT_SGLS); |
e8de56b5 NB |
698 | if (sgl_count < 0) |
699 | return sgl_count; | |
700 | ||
701 | sg_init_table(cmd->tvc_prot_sgl, sgl_count); | |
702 | cmd->tvc_prot_sgl_count = sgl_count; | |
703 | pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__, | |
704 | cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count); | |
705 | ||
706 | ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter, | |
707 | cmd->tvc_prot_sgl, | |
708 | cmd->tvc_prot_sgl_count); | |
e31885dd | 709 | if (ret < 0) { |
e31885dd NB |
710 | cmd->tvc_prot_sgl_count = 0; |
711 | return ret; | |
712 | } | |
e8de56b5 NB |
713 | } |
714 | sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes, | |
1a1ff825 | 715 | VHOST_SCSI_PREALLOC_SGLS); |
e8de56b5 NB |
716 | if (sgl_count < 0) |
717 | return sgl_count; | |
718 | ||
719 | sg_init_table(cmd->tvc_sgl, sgl_count); | |
720 | cmd->tvc_sgl_count = sgl_count; | |
721 | pr_debug("%s data_sg %p data_sgl_count %u\n", __func__, | |
722 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
723 | ||
724 | ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter, | |
725 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
726 | if (ret < 0) { | |
727 | cmd->tvc_sgl_count = 0; | |
728 | return ret; | |
e31885dd NB |
729 | } |
730 | return 0; | |
731 | } | |
732 | ||
46243860 NB |
733 | static int vhost_scsi_to_tcm_attr(int attr) |
734 | { | |
735 | switch (attr) { | |
736 | case VIRTIO_SCSI_S_SIMPLE: | |
737 | return TCM_SIMPLE_TAG; | |
738 | case VIRTIO_SCSI_S_ORDERED: | |
739 | return TCM_ORDERED_TAG; | |
740 | case VIRTIO_SCSI_S_HEAD: | |
741 | return TCM_HEAD_TAG; | |
742 | case VIRTIO_SCSI_S_ACA: | |
743 | return TCM_ACA_TAG; | |
744 | default: | |
745 | break; | |
746 | } | |
747 | return TCM_SIMPLE_TAG; | |
748 | } | |
749 | ||
1a1ff825 | 750 | static void vhost_scsi_submission_work(struct work_struct *work) |
057cbf49 | 751 | { |
1a1ff825 NB |
752 | struct vhost_scsi_cmd *cmd = |
753 | container_of(work, struct vhost_scsi_cmd, work); | |
754 | struct vhost_scsi_nexus *tv_nexus; | |
3c63f66a | 755 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
95e7c434 NB |
756 | struct scatterlist *sg_ptr, *sg_prot_ptr = NULL; |
757 | int rc; | |
057cbf49 | 758 | |
95e7c434 | 759 | /* FIXME: BIDI operation */ |
3c63f66a AH |
760 | if (cmd->tvc_sgl_count) { |
761 | sg_ptr = cmd->tvc_sgl; | |
95e7c434 NB |
762 | |
763 | if (cmd->tvc_prot_sgl_count) | |
764 | sg_prot_ptr = cmd->tvc_prot_sgl; | |
765 | else | |
766 | se_cmd->prot_pto = true; | |
057cbf49 NB |
767 | } else { |
768 | sg_ptr = NULL; | |
769 | } | |
3c63f66a | 770 | tv_nexus = cmd->tvc_nexus; |
9f0abc15 | 771 | |
649ee054 | 772 | se_cmd->tag = 0; |
9f0abc15 | 773 | rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, |
3c63f66a AH |
774 | cmd->tvc_cdb, &cmd->tvc_sense_buf[0], |
775 | cmd->tvc_lun, cmd->tvc_exp_data_len, | |
46243860 NB |
776 | vhost_scsi_to_tcm_attr(cmd->tvc_task_attr), |
777 | cmd->tvc_data_direction, TARGET_SCF_ACK_KREF, | |
778 | sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr, | |
779 | cmd->tvc_prot_sgl_count); | |
057cbf49 NB |
780 | if (rc < 0) { |
781 | transport_send_check_condition_and_sense(se_cmd, | |
9f0abc15 | 782 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
057cbf49 | 783 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 784 | } |
057cbf49 NB |
785 | } |
786 | ||
683bd967 AH |
787 | static void |
788 | vhost_scsi_send_bad_target(struct vhost_scsi *vs, | |
789 | struct vhost_virtqueue *vq, | |
790 | int head, unsigned out) | |
637ab21e AH |
791 | { |
792 | struct virtio_scsi_cmd_resp __user *resp; | |
793 | struct virtio_scsi_cmd_resp rsp; | |
794 | int ret; | |
795 | ||
796 | memset(&rsp, 0, sizeof(rsp)); | |
797 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
798 | resp = vq->iov[out].iov_base; | |
799 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
800 | if (!ret) | |
801 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
802 | else | |
803 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
804 | } | |
805 | ||
09d75832 BM |
806 | static int |
807 | vhost_scsi_get_desc(struct vhost_scsi *vs, struct vhost_virtqueue *vq, | |
808 | struct vhost_scsi_ctx *vc) | |
809 | { | |
810 | int ret = -ENXIO; | |
811 | ||
812 | vc->head = vhost_get_vq_desc(vq, vq->iov, | |
813 | ARRAY_SIZE(vq->iov), &vc->out, &vc->in, | |
814 | NULL, NULL); | |
815 | ||
816 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", | |
817 | vc->head, vc->out, vc->in); | |
818 | ||
819 | /* On error, stop handling until the next kick. */ | |
820 | if (unlikely(vc->head < 0)) | |
821 | goto done; | |
822 | ||
823 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
824 | if (vc->head == vq->num) { | |
825 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
826 | vhost_disable_notify(&vs->dev, vq); | |
827 | ret = -EAGAIN; | |
828 | } | |
829 | goto done; | |
830 | } | |
831 | ||
832 | /* | |
833 | * Get the size of request and response buffers. | |
834 | * FIXME: Not correct for BIDI operation | |
835 | */ | |
836 | vc->out_size = iov_length(vq->iov, vc->out); | |
837 | vc->in_size = iov_length(&vq->iov[vc->out], vc->in); | |
838 | ||
839 | /* | |
840 | * Copy over the virtio-scsi request header, which for a | |
841 | * ANY_LAYOUT enabled guest may span multiple iovecs, or a | |
842 | * single iovec may contain both the header + outgoing | |
843 | * WRITE payloads. | |
844 | * | |
845 | * copy_from_iter() will advance out_iter, so that it will | |
846 | * point at the start of the outgoing WRITE payload, if | |
847 | * DMA_TO_DEVICE is set. | |
848 | */ | |
849 | iov_iter_init(&vc->out_iter, WRITE, vq->iov, vc->out, vc->out_size); | |
850 | ret = 0; | |
851 | ||
852 | done: | |
853 | return ret; | |
854 | } | |
855 | ||
856 | static int | |
857 | vhost_scsi_chk_size(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc) | |
858 | { | |
859 | if (unlikely(vc->in_size < vc->rsp_size)) { | |
860 | vq_err(vq, | |
861 | "Response buf too small, need min %zu bytes got %zu", | |
862 | vc->rsp_size, vc->in_size); | |
863 | return -EINVAL; | |
864 | } else if (unlikely(vc->out_size < vc->req_size)) { | |
865 | vq_err(vq, | |
866 | "Request buf too small, need min %zu bytes got %zu", | |
867 | vc->req_size, vc->out_size); | |
868 | return -EIO; | |
869 | } | |
870 | ||
871 | return 0; | |
872 | } | |
873 | ||
874 | static int | |
875 | vhost_scsi_get_req(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc, | |
876 | struct vhost_scsi_tpg **tpgp) | |
877 | { | |
878 | int ret = -EIO; | |
879 | ||
880 | if (unlikely(!copy_from_iter_full(vc->req, vc->req_size, | |
881 | &vc->out_iter))) { | |
a691ffb4 | 882 | vq_err(vq, "Faulted on copy_from_iter_full\n"); |
09d75832 BM |
883 | } else if (unlikely(*vc->lunp != 1)) { |
884 | /* virtio-scsi spec requires byte 0 of the lun to be 1 */ | |
885 | vq_err(vq, "Illegal virtio-scsi lun: %u\n", *vc->lunp); | |
886 | } else { | |
887 | struct vhost_scsi_tpg **vs_tpg, *tpg; | |
888 | ||
889 | vs_tpg = vq->private_data; /* validated at handler entry */ | |
890 | ||
891 | tpg = READ_ONCE(vs_tpg[*vc->target]); | |
892 | if (unlikely(!tpg)) { | |
893 | vq_err(vq, "Target 0x%x does not exist\n", *vc->target); | |
894 | } else { | |
895 | if (tpgp) | |
896 | *tpgp = tpg; | |
897 | ret = 0; | |
898 | } | |
899 | } | |
900 | ||
901 | return ret; | |
902 | } | |
903 | ||
683bd967 AH |
904 | static void |
905 | vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
057cbf49 | 906 | { |
1a1ff825 | 907 | struct vhost_scsi_tpg **vs_tpg, *tpg; |
057cbf49 | 908 | struct virtio_scsi_cmd_req v_req; |
95e7c434 | 909 | struct virtio_scsi_cmd_req_pi v_req_pi; |
09d75832 | 910 | struct vhost_scsi_ctx vc; |
1a1ff825 | 911 | struct vhost_scsi_cmd *cmd; |
09d75832 | 912 | struct iov_iter in_iter, prot_iter, data_iter; |
95e7c434 | 913 | u64 tag; |
09b13fa8 | 914 | u32 exp_data_len, data_direction; |
09d75832 | 915 | int ret, prot_bytes; |
95e7c434 | 916 | u16 lun; |
09d75832 | 917 | u8 task_attr; |
09b13fa8 | 918 | bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI); |
09d75832 | 919 | void *cdb; |
057cbf49 | 920 | |
e7802212 | 921 | mutex_lock(&vq->mutex); |
4f7f46d3 AH |
922 | /* |
923 | * We can handle the vq only after the endpoint is setup by calling the | |
924 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
4f7f46d3 | 925 | */ |
e7802212 | 926 | vs_tpg = vq->private_data; |
4f7f46d3 | 927 | if (!vs_tpg) |
e7802212 | 928 | goto out; |
057cbf49 | 929 | |
09d75832 BM |
930 | memset(&vc, 0, sizeof(vc)); |
931 | vc.rsp_size = sizeof(struct virtio_scsi_cmd_resp); | |
932 | ||
057cbf49 NB |
933 | vhost_disable_notify(&vs->dev, vq); |
934 | ||
935 | for (;;) { | |
09d75832 BM |
936 | ret = vhost_scsi_get_desc(vs, vq, &vc); |
937 | if (ret) | |
938 | goto err; | |
939 | ||
09b13fa8 NB |
940 | /* |
941 | * Setup pointers and values based upon different virtio-scsi | |
942 | * request header if T10_PI is enabled in KVM guest. | |
943 | */ | |
944 | if (t10_pi) { | |
09d75832 BM |
945 | vc.req = &v_req_pi; |
946 | vc.req_size = sizeof(v_req_pi); | |
947 | vc.lunp = &v_req_pi.lun[0]; | |
948 | vc.target = &v_req_pi.lun[1]; | |
95e7c434 | 949 | } else { |
09d75832 BM |
950 | vc.req = &v_req; |
951 | vc.req_size = sizeof(v_req); | |
952 | vc.lunp = &v_req.lun[0]; | |
953 | vc.target = &v_req.lun[1]; | |
95e7c434 NB |
954 | } |
955 | ||
09b13fa8 | 956 | /* |
09d75832 BM |
957 | * Validate the size of request and response buffers. |
958 | * Check for a sane response buffer so we can report | |
959 | * early errors back to the guest. | |
09b13fa8 | 960 | */ |
09d75832 BM |
961 | ret = vhost_scsi_chk_size(vq, &vc); |
962 | if (ret) | |
963 | goto err; | |
057cbf49 | 964 | |
09d75832 BM |
965 | ret = vhost_scsi_get_req(vq, &vc, &tpg); |
966 | if (ret) | |
967 | goto err; | |
968 | ||
969 | ret = -EIO; /* bad target on any error from here on */ | |
7fe412d0 | 970 | |
95e7c434 | 971 | /* |
09b13fa8 NB |
972 | * Determine data_direction by calculating the total outgoing |
973 | * iovec sizes + incoming iovec sizes vs. virtio-scsi request + | |
974 | * response headers respectively. | |
95e7c434 | 975 | * |
09b13fa8 NB |
976 | * For DMA_TO_DEVICE this is out_iter, which is already pointing |
977 | * to the right place. | |
978 | * | |
979 | * For DMA_FROM_DEVICE, the iovec will be just past the end | |
980 | * of the virtio-scsi response header in either the same | |
981 | * or immediately following iovec. | |
95e7c434 | 982 | * |
09b13fa8 NB |
983 | * Any associated T10_PI bytes for the outgoing / incoming |
984 | * payloads are included in calculation of exp_data_len here. | |
95e7c434 | 985 | */ |
09b13fa8 NB |
986 | prot_bytes = 0; |
987 | ||
09d75832 | 988 | if (vc.out_size > vc.req_size) { |
09b13fa8 | 989 | data_direction = DMA_TO_DEVICE; |
09d75832 BM |
990 | exp_data_len = vc.out_size - vc.req_size; |
991 | data_iter = vc.out_iter; | |
992 | } else if (vc.in_size > vc.rsp_size) { | |
09b13fa8 | 993 | data_direction = DMA_FROM_DEVICE; |
09d75832 | 994 | exp_data_len = vc.in_size - vc.rsp_size; |
09b13fa8 | 995 | |
09d75832 BM |
996 | iov_iter_init(&in_iter, READ, &vq->iov[vc.out], vc.in, |
997 | vc.rsp_size + exp_data_len); | |
998 | iov_iter_advance(&in_iter, vc.rsp_size); | |
09b13fa8 NB |
999 | data_iter = in_iter; |
1000 | } else { | |
1001 | data_direction = DMA_NONE; | |
1002 | exp_data_len = 0; | |
1003 | } | |
1004 | /* | |
1005 | * If T10_PI header + payload is present, setup prot_iter values | |
1006 | * and recalculate data_iter for vhost_scsi_mapal() mapping to | |
1007 | * host scatterlists via get_user_pages_fast(). | |
95e7c434 | 1008 | */ |
09b13fa8 | 1009 | if (t10_pi) { |
95e7c434 NB |
1010 | if (v_req_pi.pi_bytesout) { |
1011 | if (data_direction != DMA_TO_DEVICE) { | |
09b13fa8 NB |
1012 | vq_err(vq, "Received non zero pi_bytesout," |
1013 | " but wrong data_direction\n"); | |
09d75832 | 1014 | goto err; |
95e7c434 | 1015 | } |
e72fd72e | 1016 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout); |
95e7c434 NB |
1017 | } else if (v_req_pi.pi_bytesin) { |
1018 | if (data_direction != DMA_FROM_DEVICE) { | |
09b13fa8 NB |
1019 | vq_err(vq, "Received non zero pi_bytesin," |
1020 | " but wrong data_direction\n"); | |
09d75832 | 1021 | goto err; |
95e7c434 | 1022 | } |
e72fd72e | 1023 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin); |
95e7c434 | 1024 | } |
09b13fa8 | 1025 | /* |
4542d623 GE |
1026 | * Set prot_iter to data_iter and truncate it to |
1027 | * prot_bytes, and advance data_iter past any | |
09b13fa8 NB |
1028 | * preceeding prot_bytes that may be present. |
1029 | * | |
1030 | * Also fix up the exp_data_len to reflect only the | |
1031 | * actual data payload length. | |
1032 | */ | |
95e7c434 | 1033 | if (prot_bytes) { |
09b13fa8 NB |
1034 | exp_data_len -= prot_bytes; |
1035 | prot_iter = data_iter; | |
4542d623 | 1036 | iov_iter_truncate(&prot_iter, prot_bytes); |
09b13fa8 | 1037 | iov_iter_advance(&data_iter, prot_bytes); |
95e7c434 | 1038 | } |
e72fd72e | 1039 | tag = vhost64_to_cpu(vq, v_req_pi.tag); |
95e7c434 NB |
1040 | task_attr = v_req_pi.task_attr; |
1041 | cdb = &v_req_pi.cdb[0]; | |
1042 | lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF; | |
1043 | } else { | |
e72fd72e | 1044 | tag = vhost64_to_cpu(vq, v_req.tag); |
95e7c434 NB |
1045 | task_attr = v_req.task_attr; |
1046 | cdb = &v_req.cdb[0]; | |
1047 | lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; | |
1048 | } | |
95e7c434 | 1049 | /* |
09b13fa8 NB |
1050 | * Check that the received CDB size does not exceeded our |
1051 | * hardcoded max for vhost-scsi, then get a pre-allocated | |
1052 | * cmd descriptor for the new virtio-scsi tag. | |
95e7c434 NB |
1053 | * |
1054 | * TODO what if cdb was too small for varlen cdb header? | |
1055 | */ | |
1a1ff825 | 1056 | if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) { |
95e7c434 NB |
1057 | vq_err(vq, "Received SCSI CDB with command_size: %d that" |
1058 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
1a1ff825 | 1059 | scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE); |
09d75832 | 1060 | goto err; |
95e7c434 | 1061 | } |
95e7c434 | 1062 | cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr, |
9f977ef7 NB |
1063 | exp_data_len + prot_bytes, |
1064 | data_direction); | |
3c63f66a | 1065 | if (IS_ERR(cmd)) { |
4824d3bf | 1066 | vq_err(vq, "vhost_scsi_get_tag failed %ld\n", |
09b13fa8 | 1067 | PTR_ERR(cmd)); |
09d75832 | 1068 | goto err; |
057cbf49 | 1069 | } |
3c63f66a AH |
1070 | cmd->tvc_vhost = vs; |
1071 | cmd->tvc_vq = vq; | |
09d75832 BM |
1072 | cmd->tvc_resp_iov = vq->iov[vc.out]; |
1073 | cmd->tvc_in_iovs = vc.in; | |
057cbf49 | 1074 | |
057cbf49 | 1075 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", |
09b13fa8 NB |
1076 | cmd->tvc_cdb[0], cmd->tvc_lun); |
1077 | pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:" | |
1078 | " %d\n", cmd, exp_data_len, prot_bytes, data_direction); | |
057cbf49 NB |
1079 | |
1080 | if (data_direction != DMA_NONE) { | |
09d75832 BM |
1081 | if (unlikely(vhost_scsi_mapal(cmd, prot_bytes, |
1082 | &prot_iter, exp_data_len, | |
1083 | &data_iter))) { | |
057cbf49 | 1084 | vq_err(vq, "Failed to map iov to sgl\n"); |
1a1ff825 | 1085 | vhost_scsi_release_cmd(&cmd->tvc_se_cmd); |
09d75832 | 1086 | goto err; |
057cbf49 NB |
1087 | } |
1088 | } | |
057cbf49 NB |
1089 | /* |
1090 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
1091 | * complete the virtio-scsi request in TCM callback context via | |
09b13fa8 | 1092 | * vhost_scsi_queue_data_in() and vhost_scsi_queue_status() |
057cbf49 | 1093 | */ |
09d75832 | 1094 | cmd->tvc_vq_desc = vc.head; |
057cbf49 | 1095 | /* |
09b13fa8 NB |
1096 | * Dispatch cmd descriptor for cmwq execution in process |
1097 | * context provided by vhost_scsi_workqueue. This also ensures | |
1098 | * cmd is executed on the same kworker CPU as this vhost | |
1099 | * thread to gain positive L2 cache locality effects. | |
057cbf49 | 1100 | */ |
1a1ff825 NB |
1101 | INIT_WORK(&cmd->work, vhost_scsi_submission_work); |
1102 | queue_work(vhost_scsi_workqueue, &cmd->work); | |
09d75832 BM |
1103 | ret = 0; |
1104 | err: | |
1105 | /* | |
1106 | * ENXIO: No more requests, or read error, wait for next kick | |
1107 | * EINVAL: Invalid response buffer, drop the request | |
1108 | * EIO: Respond with bad target | |
1109 | * EAGAIN: Pending request | |
1110 | */ | |
1111 | if (ret == -ENXIO) | |
1112 | break; | |
1113 | else if (ret == -EIO) | |
1114 | vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out); | |
057cbf49 | 1115 | } |
e7802212 | 1116 | out: |
7ea206cf | 1117 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
1118 | } |
1119 | ||
0d02dbd6 | 1120 | static void |
09d75832 BM |
1121 | vhost_scsi_send_tmf_reject(struct vhost_scsi *vs, |
1122 | struct vhost_virtqueue *vq, | |
1123 | struct vhost_scsi_ctx *vc) | |
0d02dbd6 | 1124 | { |
0d02dbd6 | 1125 | struct virtio_scsi_ctrl_tmf_resp rsp; |
8e5dadfe | 1126 | struct iov_iter iov_iter; |
0d02dbd6 BM |
1127 | int ret; |
1128 | ||
1129 | pr_debug("%s\n", __func__); | |
1130 | memset(&rsp, 0, sizeof(rsp)); | |
1131 | rsp.response = VIRTIO_SCSI_S_FUNCTION_REJECTED; | |
8e5dadfe BM |
1132 | |
1133 | iov_iter_init(&iov_iter, READ, &vq->iov[vc->out], vc->in, sizeof(rsp)); | |
1134 | ||
1135 | ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter); | |
1136 | if (likely(ret == sizeof(rsp))) | |
3f8ca2e1 | 1137 | vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0); |
0d02dbd6 BM |
1138 | else |
1139 | pr_err("Faulted on virtio_scsi_ctrl_tmf_resp\n"); | |
1140 | } | |
1141 | ||
1142 | static void | |
1143 | vhost_scsi_send_an_resp(struct vhost_scsi *vs, | |
3f8ca2e1 BM |
1144 | struct vhost_virtqueue *vq, |
1145 | struct vhost_scsi_ctx *vc) | |
0d02dbd6 | 1146 | { |
0d02dbd6 | 1147 | struct virtio_scsi_ctrl_an_resp rsp; |
8e5dadfe | 1148 | struct iov_iter iov_iter; |
0d02dbd6 BM |
1149 | int ret; |
1150 | ||
1151 | pr_debug("%s\n", __func__); | |
1152 | memset(&rsp, 0, sizeof(rsp)); /* event_actual = 0 */ | |
1153 | rsp.response = VIRTIO_SCSI_S_OK; | |
8e5dadfe BM |
1154 | |
1155 | iov_iter_init(&iov_iter, READ, &vq->iov[vc->out], vc->in, sizeof(rsp)); | |
1156 | ||
1157 | ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter); | |
1158 | if (likely(ret == sizeof(rsp))) | |
3f8ca2e1 | 1159 | vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0); |
0d02dbd6 BM |
1160 | else |
1161 | pr_err("Faulted on virtio_scsi_ctrl_an_resp\n"); | |
1162 | } | |
1163 | ||
1164 | static void | |
1165 | vhost_scsi_ctl_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
1166 | { | |
1167 | union { | |
1168 | __virtio32 type; | |
1169 | struct virtio_scsi_ctrl_an_req an; | |
1170 | struct virtio_scsi_ctrl_tmf_req tmf; | |
1171 | } v_req; | |
3f8ca2e1 BM |
1172 | struct vhost_scsi_ctx vc; |
1173 | size_t typ_size; | |
1174 | int ret; | |
0d02dbd6 BM |
1175 | |
1176 | mutex_lock(&vq->mutex); | |
1177 | /* | |
1178 | * We can handle the vq only after the endpoint is setup by calling the | |
1179 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
1180 | */ | |
1181 | if (!vq->private_data) | |
1182 | goto out; | |
1183 | ||
3f8ca2e1 BM |
1184 | memset(&vc, 0, sizeof(vc)); |
1185 | ||
0d02dbd6 BM |
1186 | vhost_disable_notify(&vs->dev, vq); |
1187 | ||
1188 | for (;;) { | |
3f8ca2e1 BM |
1189 | ret = vhost_scsi_get_desc(vs, vq, &vc); |
1190 | if (ret) | |
1191 | goto err; | |
0d02dbd6 BM |
1192 | |
1193 | /* | |
3f8ca2e1 BM |
1194 | * Get the request type first in order to setup |
1195 | * other parameters dependent on the type. | |
0d02dbd6 | 1196 | */ |
3f8ca2e1 | 1197 | vc.req = &v_req.type; |
0d02dbd6 BM |
1198 | typ_size = sizeof(v_req.type); |
1199 | ||
3f8ca2e1 BM |
1200 | if (unlikely(!copy_from_iter_full(vc.req, typ_size, |
1201 | &vc.out_iter))) { | |
0d02dbd6 BM |
1202 | vq_err(vq, "Faulted on copy_from_iter tmf type\n"); |
1203 | /* | |
3f8ca2e1 BM |
1204 | * The size of the response buffer depends on the |
1205 | * request type and must be validated against it. | |
0d02dbd6 BM |
1206 | * Since the request type is not known, don't send |
1207 | * a response. | |
1208 | */ | |
1209 | continue; | |
1210 | } | |
1211 | ||
1212 | switch (v_req.type) { | |
1213 | case VIRTIO_SCSI_T_TMF: | |
3f8ca2e1 BM |
1214 | vc.req = &v_req.tmf; |
1215 | vc.req_size = sizeof(struct virtio_scsi_ctrl_tmf_req); | |
1216 | vc.rsp_size = sizeof(struct virtio_scsi_ctrl_tmf_resp); | |
1217 | vc.lunp = &v_req.tmf.lun[0]; | |
1218 | vc.target = &v_req.tmf.lun[1]; | |
0d02dbd6 BM |
1219 | break; |
1220 | case VIRTIO_SCSI_T_AN_QUERY: | |
1221 | case VIRTIO_SCSI_T_AN_SUBSCRIBE: | |
3f8ca2e1 BM |
1222 | vc.req = &v_req.an; |
1223 | vc.req_size = sizeof(struct virtio_scsi_ctrl_an_req); | |
1224 | vc.rsp_size = sizeof(struct virtio_scsi_ctrl_an_resp); | |
1225 | vc.lunp = &v_req.an.lun[0]; | |
1226 | vc.target = NULL; | |
0d02dbd6 BM |
1227 | break; |
1228 | default: | |
1229 | vq_err(vq, "Unknown control request %d", v_req.type); | |
1230 | continue; | |
1231 | } | |
1232 | ||
1233 | /* | |
3f8ca2e1 BM |
1234 | * Validate the size of request and response buffers. |
1235 | * Check for a sane response buffer so we can report | |
1236 | * early errors back to the guest. | |
0d02dbd6 | 1237 | */ |
3f8ca2e1 BM |
1238 | ret = vhost_scsi_chk_size(vq, &vc); |
1239 | if (ret) | |
1240 | goto err; | |
0d02dbd6 | 1241 | |
3f8ca2e1 BM |
1242 | /* |
1243 | * Get the rest of the request now that its size is known. | |
1244 | */ | |
1245 | vc.req += typ_size; | |
1246 | vc.req_size -= typ_size; | |
0d02dbd6 | 1247 | |
3f8ca2e1 BM |
1248 | ret = vhost_scsi_get_req(vq, &vc, NULL); |
1249 | if (ret) | |
1250 | goto err; | |
0d02dbd6 | 1251 | |
3f8ca2e1 | 1252 | if (v_req.type == VIRTIO_SCSI_T_TMF) |
09d75832 | 1253 | vhost_scsi_send_tmf_reject(vs, vq, &vc); |
3f8ca2e1 BM |
1254 | else |
1255 | vhost_scsi_send_an_resp(vs, vq, &vc); | |
1256 | err: | |
1257 | /* | |
1258 | * ENXIO: No more requests, or read error, wait for next kick | |
1259 | * EINVAL: Invalid response buffer, drop the request | |
1260 | * EIO: Respond with bad target | |
1261 | * EAGAIN: Pending request | |
1262 | */ | |
1263 | if (ret == -ENXIO) | |
1264 | break; | |
1265 | else if (ret == -EIO) | |
1266 | vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out); | |
0d02dbd6 BM |
1267 | } |
1268 | out: | |
1269 | mutex_unlock(&vq->mutex); | |
1270 | } | |
1271 | ||
057cbf49 NB |
1272 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) |
1273 | { | |
0d02dbd6 BM |
1274 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1275 | poll.work); | |
1276 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1277 | ||
101998f6 | 1278 | pr_debug("%s: The handling func for control queue.\n", __func__); |
0d02dbd6 | 1279 | vhost_scsi_ctl_handle_vq(vs, vq); |
057cbf49 NB |
1280 | } |
1281 | ||
683bd967 | 1282 | static void |
1a1ff825 NB |
1283 | vhost_scsi_send_evt(struct vhost_scsi *vs, |
1284 | struct vhost_scsi_tpg *tpg, | |
683bd967 AH |
1285 | struct se_lun *lun, |
1286 | u32 event, | |
1287 | u32 reason) | |
a6c9af87 | 1288 | { |
1a1ff825 | 1289 | struct vhost_scsi_evt *evt; |
a6c9af87 | 1290 | |
1a1ff825 | 1291 | evt = vhost_scsi_allocate_evt(vs, event, reason); |
a6c9af87 AH |
1292 | if (!evt) |
1293 | return; | |
1294 | ||
1295 | if (tpg && lun) { | |
1296 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
1297 | /* | |
1298 | * Note: evt->event is zeroed when we allocate it and | |
1299 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
1300 | */ | |
1301 | evt->event.lun[0] = 0x01; | |
59c816c1 | 1302 | evt->event.lun[1] = tpg->tport_tpgt; |
a6c9af87 AH |
1303 | if (lun->unpacked_lun >= 256) |
1304 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
1305 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
1306 | } | |
1307 | ||
1308 | llist_add(&evt->list, &vs->vs_event_list); | |
1309 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
1310 | } | |
1311 | ||
057cbf49 NB |
1312 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
1313 | { | |
a6c9af87 AH |
1314 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1315 | poll.work); | |
1316 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1317 | ||
1318 | mutex_lock(&vq->mutex); | |
1319 | if (!vq->private_data) | |
1320 | goto out; | |
1321 | ||
1322 | if (vs->vs_events_missed) | |
1a1ff825 | 1323 | vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); |
a6c9af87 AH |
1324 | out: |
1325 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
1326 | } |
1327 | ||
1328 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
1329 | { | |
1330 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
1331 | poll.work); | |
1332 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1333 | ||
1b7f390e | 1334 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
1335 | } |
1336 | ||
4f7f46d3 AH |
1337 | static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
1338 | { | |
3ab2e420 | 1339 | vhost_poll_flush(&vs->vqs[index].vq.poll); |
4f7f46d3 AH |
1340 | } |
1341 | ||
3dfbff32 | 1342 | /* Callers must hold dev mutex */ |
4f7f46d3 AH |
1343 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
1344 | { | |
f2f0173d | 1345 | struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; |
4f7f46d3 AH |
1346 | int i; |
1347 | ||
f2f0173d | 1348 | /* Init new inflight and remember the old inflight */ |
1a1ff825 | 1349 | vhost_scsi_init_inflight(vs, old_inflight); |
f2f0173d AH |
1350 | |
1351 | /* | |
1352 | * The inflight->kref was initialized to 1. We decrement it here to | |
1353 | * indicate the start of the flush operation so that it will reach 0 | |
1354 | * when all the reqs are finished. | |
1355 | */ | |
1356 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1a1ff825 | 1357 | kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
1358 | |
1359 | /* Flush both the vhost poll and vhost work */ | |
4f7f46d3 AH |
1360 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
1361 | vhost_scsi_flush_vq(vs, i); | |
1362 | vhost_work_flush(&vs->dev, &vs->vs_completion_work); | |
a6c9af87 | 1363 | vhost_work_flush(&vs->dev, &vs->vs_event_work); |
f2f0173d AH |
1364 | |
1365 | /* Wait for all reqs issued before the flush to be finished */ | |
1366 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1367 | wait_for_completion(&old_inflight[i]->comp); | |
4f7f46d3 AH |
1368 | } |
1369 | ||
057cbf49 NB |
1370 | /* |
1371 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
1a1ff825 | 1372 | * vhost_scsi_tpg with an active struct vhost_scsi_nexus |
f2b7daf5 AH |
1373 | * |
1374 | * The lock nesting rule is: | |
1a1ff825 | 1375 | * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex |
057cbf49 | 1376 | */ |
683bd967 AH |
1377 | static int |
1378 | vhost_scsi_set_endpoint(struct vhost_scsi *vs, | |
1379 | struct vhost_scsi_target *t) | |
057cbf49 | 1380 | { |
ab8edab1 | 1381 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1382 | struct vhost_scsi_tport *tv_tport; |
1383 | struct vhost_scsi_tpg *tpg; | |
1384 | struct vhost_scsi_tpg **vs_tpg; | |
4f7f46d3 AH |
1385 | struct vhost_virtqueue *vq; |
1386 | int index, ret, i, len; | |
67e18cf9 | 1387 | bool match = false; |
057cbf49 | 1388 | |
1a1ff825 | 1389 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 1390 | mutex_lock(&vs->dev.mutex); |
f2b7daf5 | 1391 | |
057cbf49 NB |
1392 | /* Verify that ring has been setup correctly. */ |
1393 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
1394 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 1395 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
1396 | ret = -EFAULT; |
1397 | goto out; | |
057cbf49 NB |
1398 | } |
1399 | } | |
057cbf49 | 1400 | |
4f7f46d3 AH |
1401 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
1402 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
1403 | if (!vs_tpg) { | |
f2b7daf5 AH |
1404 | ret = -ENOMEM; |
1405 | goto out; | |
4f7f46d3 AH |
1406 | } |
1407 | if (vs->vs_tpg) | |
1408 | memcpy(vs_tpg, vs->vs_tpg, len); | |
1409 | ||
1a1ff825 | 1410 | list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) { |
98718312 AH |
1411 | mutex_lock(&tpg->tv_tpg_mutex); |
1412 | if (!tpg->tpg_nexus) { | |
1413 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1414 | continue; |
1415 | } | |
98718312 AH |
1416 | if (tpg->tv_tpg_vhost_count != 0) { |
1417 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1418 | continue; |
1419 | } | |
98718312 | 1420 | tv_tport = tpg->tport; |
057cbf49 | 1421 | |
67e18cf9 | 1422 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
98718312 | 1423 | if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
4f7f46d3 | 1424 | kfree(vs_tpg); |
98718312 | 1425 | mutex_unlock(&tpg->tv_tpg_mutex); |
f2b7daf5 AH |
1426 | ret = -EEXIST; |
1427 | goto out; | |
101998f6 | 1428 | } |
ab8edab1 NB |
1429 | /* |
1430 | * In order to ensure individual vhost-scsi configfs | |
1431 | * groups cannot be removed while in use by vhost ioctl, | |
1432 | * go ahead and take an explicit se_tpg->tpg_group.cg_item | |
1433 | * dependency now. | |
1434 | */ | |
1435 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1436 | ret = target_depend_item(&se_tpg->tpg_group.cg_item); |
ab8edab1 | 1437 | if (ret) { |
a691ffb4 | 1438 | pr_warn("target_depend_item() failed: %d\n", ret); |
ab8edab1 NB |
1439 | kfree(vs_tpg); |
1440 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1441 | goto out; | |
1442 | } | |
98718312 AH |
1443 | tpg->tv_tpg_vhost_count++; |
1444 | tpg->vhost_scsi = vs; | |
1445 | vs_tpg[tpg->tport_tpgt] = tpg; | |
4e857c58 | 1446 | smp_mb__after_atomic(); |
67e18cf9 | 1447 | match = true; |
057cbf49 | 1448 | } |
98718312 | 1449 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1450 | } |
67e18cf9 AH |
1451 | |
1452 | if (match) { | |
1453 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1454 | sizeof(vs->vs_vhost_wwpn)); | |
4f7f46d3 | 1455 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
3ab2e420 | 1456 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1457 | mutex_lock(&vq->mutex); |
22fa90c7 | 1458 | vq->private_data = vs_tpg; |
80f7d030 | 1459 | vhost_vq_init_access(vq); |
4f7f46d3 AH |
1460 | mutex_unlock(&vq->mutex); |
1461 | } | |
67e18cf9 AH |
1462 | ret = 0; |
1463 | } else { | |
1464 | ret = -EEXIST; | |
1465 | } | |
1466 | ||
4f7f46d3 AH |
1467 | /* |
1468 | * Act as synchronize_rcu to make sure access to | |
1469 | * old vs->vs_tpg is finished. | |
1470 | */ | |
1471 | vhost_scsi_flush(vs); | |
1472 | kfree(vs->vs_tpg); | |
1473 | vs->vs_tpg = vs_tpg; | |
1474 | ||
f2b7daf5 | 1475 | out: |
67e18cf9 | 1476 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1477 | mutex_unlock(&vhost_scsi_mutex); |
67e18cf9 | 1478 | return ret; |
057cbf49 NB |
1479 | } |
1480 | ||
683bd967 AH |
1481 | static int |
1482 | vhost_scsi_clear_endpoint(struct vhost_scsi *vs, | |
1483 | struct vhost_scsi_target *t) | |
057cbf49 | 1484 | { |
ab8edab1 | 1485 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1486 | struct vhost_scsi_tport *tv_tport; |
1487 | struct vhost_scsi_tpg *tpg; | |
4f7f46d3 AH |
1488 | struct vhost_virtqueue *vq; |
1489 | bool match = false; | |
67e18cf9 AH |
1490 | int index, ret, i; |
1491 | u8 target; | |
057cbf49 | 1492 | |
1a1ff825 | 1493 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 NB |
1494 | mutex_lock(&vs->dev.mutex); |
1495 | /* Verify that ring has been setup correctly. */ | |
1496 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1497 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1498 | ret = -EFAULT; |
038e0af4 | 1499 | goto err_dev; |
057cbf49 NB |
1500 | } |
1501 | } | |
4f7f46d3 AH |
1502 | |
1503 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1504 | ret = 0; |
1505 | goto err_dev; | |
4f7f46d3 AH |
1506 | } |
1507 | ||
67e18cf9 AH |
1508 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1509 | target = i; | |
98718312 AH |
1510 | tpg = vs->vs_tpg[target]; |
1511 | if (!tpg) | |
67e18cf9 AH |
1512 | continue; |
1513 | ||
98718312 AH |
1514 | mutex_lock(&tpg->tv_tpg_mutex); |
1515 | tv_tport = tpg->tport; | |
67e18cf9 AH |
1516 | if (!tv_tport) { |
1517 | ret = -ENODEV; | |
038e0af4 | 1518 | goto err_tpg; |
67e18cf9 AH |
1519 | } |
1520 | ||
1521 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
98718312 | 1522 | pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" |
67e18cf9 | 1523 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", |
98718312 | 1524 | tv_tport->tport_name, tpg->tport_tpgt, |
67e18cf9 AH |
1525 | t->vhost_wwpn, t->vhost_tpgt); |
1526 | ret = -EINVAL; | |
038e0af4 | 1527 | goto err_tpg; |
67e18cf9 | 1528 | } |
98718312 AH |
1529 | tpg->tv_tpg_vhost_count--; |
1530 | tpg->vhost_scsi = NULL; | |
67e18cf9 | 1531 | vs->vs_tpg[target] = NULL; |
4f7f46d3 | 1532 | match = true; |
98718312 | 1533 | mutex_unlock(&tpg->tv_tpg_mutex); |
ab8edab1 NB |
1534 | /* |
1535 | * Release se_tpg->tpg_group.cg_item configfs dependency now | |
1536 | * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur. | |
1537 | */ | |
1538 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1539 | target_undepend_item(&se_tpg->tpg_group.cg_item); |
057cbf49 | 1540 | } |
4f7f46d3 AH |
1541 | if (match) { |
1542 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
3ab2e420 | 1543 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1544 | mutex_lock(&vq->mutex); |
22fa90c7 | 1545 | vq->private_data = NULL; |
4f7f46d3 AH |
1546 | mutex_unlock(&vq->mutex); |
1547 | } | |
1548 | } | |
1549 | /* | |
1550 | * Act as synchronize_rcu to make sure access to | |
1551 | * old vs->vs_tpg is finished. | |
1552 | */ | |
1553 | vhost_scsi_flush(vs); | |
1554 | kfree(vs->vs_tpg); | |
1555 | vs->vs_tpg = NULL; | |
a6c9af87 | 1556 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1557 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1558 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 1559 | return 0; |
101998f6 | 1560 | |
038e0af4 | 1561 | err_tpg: |
98718312 | 1562 | mutex_unlock(&tpg->tv_tpg_mutex); |
038e0af4 | 1563 | err_dev: |
101998f6 | 1564 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1565 | mutex_unlock(&vhost_scsi_mutex); |
101998f6 | 1566 | return ret; |
057cbf49 NB |
1567 | } |
1568 | ||
4f7f46d3 AH |
1569 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1570 | { | |
ea16c514 MT |
1571 | struct vhost_virtqueue *vq; |
1572 | int i; | |
1573 | ||
4f7f46d3 AH |
1574 | if (features & ~VHOST_SCSI_FEATURES) |
1575 | return -EOPNOTSUPP; | |
1576 | ||
1577 | mutex_lock(&vs->dev.mutex); | |
1578 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1579 | !vhost_log_access_ok(&vs->dev)) { | |
1580 | mutex_unlock(&vs->dev.mutex); | |
1581 | return -EFAULT; | |
1582 | } | |
ea16c514 MT |
1583 | |
1584 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
1585 | vq = &vs->vqs[i].vq; | |
1586 | mutex_lock(&vq->mutex); | |
1587 | vq->acked_features = features; | |
1588 | mutex_unlock(&vq->mutex); | |
1589 | } | |
4f7f46d3 AH |
1590 | mutex_unlock(&vs->dev.mutex); |
1591 | return 0; | |
1592 | } | |
1593 | ||
057cbf49 NB |
1594 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1595 | { | |
c7289312 | 1596 | struct vhost_scsi *vs; |
3ab2e420 | 1597 | struct vhost_virtqueue **vqs; |
595cb754 | 1598 | int r = -ENOMEM, i; |
057cbf49 | 1599 | |
dcda9b04 | 1600 | vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_RETRY_MAYFAIL); |
595cb754 MT |
1601 | if (!vs) { |
1602 | vs = vzalloc(sizeof(*vs)); | |
1603 | if (!vs) | |
1604 | goto err_vs; | |
1605 | } | |
057cbf49 | 1606 | |
6da2ec56 | 1607 | vqs = kmalloc_array(VHOST_SCSI_MAX_VQ, sizeof(*vqs), GFP_KERNEL); |
595cb754 MT |
1608 | if (!vqs) |
1609 | goto err_vqs; | |
3ab2e420 | 1610 | |
c7289312 | 1611 | vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); |
1a1ff825 | 1612 | vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work); |
a6c9af87 | 1613 | |
c7289312 AH |
1614 | vs->vs_events_nr = 0; |
1615 | vs->vs_events_missed = false; | |
057cbf49 | 1616 | |
c7289312 AH |
1617 | vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; |
1618 | vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1619 | vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1620 | vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
3ab2e420 | 1621 | for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { |
c7289312 AH |
1622 | vqs[i] = &vs->vqs[i].vq; |
1623 | vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
3ab2e420 | 1624 | } |
b46a0bf7 | 1625 | vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ, UIO_MAXIOV); |
f2f0173d | 1626 | |
1a1ff825 | 1627 | vhost_scsi_init_inflight(vs, NULL); |
f2f0173d | 1628 | |
c7289312 | 1629 | f->private_data = vs; |
057cbf49 | 1630 | return 0; |
595cb754 | 1631 | |
595cb754 | 1632 | err_vqs: |
68404441 | 1633 | kvfree(vs); |
595cb754 MT |
1634 | err_vs: |
1635 | return r; | |
057cbf49 NB |
1636 | } |
1637 | ||
1638 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1639 | { | |
c7289312 | 1640 | struct vhost_scsi *vs = f->private_data; |
67e18cf9 | 1641 | struct vhost_scsi_target t; |
057cbf49 | 1642 | |
c7289312 AH |
1643 | mutex_lock(&vs->dev.mutex); |
1644 | memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1645 | mutex_unlock(&vs->dev.mutex); | |
1646 | vhost_scsi_clear_endpoint(vs, &t); | |
1647 | vhost_dev_stop(&vs->dev); | |
f6f93f75 | 1648 | vhost_dev_cleanup(&vs->dev); |
a6c9af87 | 1649 | /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
c7289312 AH |
1650 | vhost_scsi_flush(vs); |
1651 | kfree(vs->dev.vqs); | |
68404441 | 1652 | kvfree(vs); |
057cbf49 NB |
1653 | return 0; |
1654 | } | |
1655 | ||
683bd967 AH |
1656 | static long |
1657 | vhost_scsi_ioctl(struct file *f, | |
1658 | unsigned int ioctl, | |
1659 | unsigned long arg) | |
057cbf49 NB |
1660 | { |
1661 | struct vhost_scsi *vs = f->private_data; | |
1662 | struct vhost_scsi_target backend; | |
1663 | void __user *argp = (void __user *)arg; | |
1664 | u64 __user *featurep = argp; | |
11c63418 AH |
1665 | u32 __user *eventsp = argp; |
1666 | u32 events_missed; | |
057cbf49 | 1667 | u64 features; |
101998f6 | 1668 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1669 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1670 | |
1671 | switch (ioctl) { | |
1672 | case VHOST_SCSI_SET_ENDPOINT: | |
1673 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1674 | return -EFAULT; | |
6de7145c MT |
1675 | if (backend.reserved != 0) |
1676 | return -EOPNOTSUPP; | |
057cbf49 NB |
1677 | |
1678 | return vhost_scsi_set_endpoint(vs, &backend); | |
1679 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1680 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1681 | return -EFAULT; | |
6de7145c MT |
1682 | if (backend.reserved != 0) |
1683 | return -EOPNOTSUPP; | |
057cbf49 NB |
1684 | |
1685 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1686 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1687 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1688 | return -EFAULT; |
1689 | return 0; | |
11c63418 AH |
1690 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1691 | if (get_user(events_missed, eventsp)) | |
1692 | return -EFAULT; | |
1693 | mutex_lock(&vq->mutex); | |
1694 | vs->vs_events_missed = events_missed; | |
1695 | mutex_unlock(&vq->mutex); | |
1696 | return 0; | |
1697 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1698 | mutex_lock(&vq->mutex); | |
1699 | events_missed = vs->vs_events_missed; | |
1700 | mutex_unlock(&vq->mutex); | |
1701 | if (put_user(events_missed, eventsp)) | |
1702 | return -EFAULT; | |
1703 | return 0; | |
057cbf49 | 1704 | case VHOST_GET_FEATURES: |
5dade710 | 1705 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1706 | if (copy_to_user(featurep, &features, sizeof features)) |
1707 | return -EFAULT; | |
1708 | return 0; | |
1709 | case VHOST_SET_FEATURES: | |
1710 | if (copy_from_user(&features, featurep, sizeof features)) | |
1711 | return -EFAULT; | |
1712 | return vhost_scsi_set_features(vs, features); | |
1713 | default: | |
1714 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1715 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1716 | /* TODO: flush backend after dev ioctl. */ | |
1717 | if (r == -ENOIOCTLCMD) | |
1718 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1719 | mutex_unlock(&vs->dev.mutex); |
1720 | return r; | |
1721 | } | |
1722 | } | |
1723 | ||
101998f6 NB |
1724 | #ifdef CONFIG_COMPAT |
1725 | static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, | |
1726 | unsigned long arg) | |
1727 | { | |
1728 | return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1729 | } | |
1730 | #endif | |
1731 | ||
057cbf49 NB |
1732 | static const struct file_operations vhost_scsi_fops = { |
1733 | .owner = THIS_MODULE, | |
1734 | .release = vhost_scsi_release, | |
1735 | .unlocked_ioctl = vhost_scsi_ioctl, | |
101998f6 NB |
1736 | #ifdef CONFIG_COMPAT |
1737 | .compat_ioctl = vhost_scsi_compat_ioctl, | |
1738 | #endif | |
057cbf49 NB |
1739 | .open = vhost_scsi_open, |
1740 | .llseek = noop_llseek, | |
1741 | }; | |
1742 | ||
1743 | static struct miscdevice vhost_scsi_misc = { | |
1744 | MISC_DYNAMIC_MINOR, | |
1745 | "vhost-scsi", | |
1746 | &vhost_scsi_fops, | |
1747 | }; | |
1748 | ||
1749 | static int __init vhost_scsi_register(void) | |
1750 | { | |
1751 | return misc_register(&vhost_scsi_misc); | |
1752 | } | |
1753 | ||
f368ed60 | 1754 | static void vhost_scsi_deregister(void) |
057cbf49 | 1755 | { |
f368ed60 | 1756 | misc_deregister(&vhost_scsi_misc); |
057cbf49 NB |
1757 | } |
1758 | ||
1a1ff825 | 1759 | static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport) |
057cbf49 NB |
1760 | { |
1761 | switch (tport->tport_proto_id) { | |
1762 | case SCSI_PROTOCOL_SAS: | |
1763 | return "SAS"; | |
1764 | case SCSI_PROTOCOL_FCP: | |
1765 | return "FCP"; | |
1766 | case SCSI_PROTOCOL_ISCSI: | |
1767 | return "iSCSI"; | |
1768 | default: | |
1769 | break; | |
1770 | } | |
1771 | ||
1772 | return "Unknown"; | |
1773 | } | |
1774 | ||
683bd967 | 1775 | static void |
1a1ff825 | 1776 | vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg, |
683bd967 | 1777 | struct se_lun *lun, bool plug) |
a6c9af87 AH |
1778 | { |
1779 | ||
1780 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1781 | struct vhost_virtqueue *vq; | |
1782 | u32 reason; | |
1783 | ||
1784 | if (!vs) | |
1785 | return; | |
1786 | ||
1787 | mutex_lock(&vs->dev.mutex); | |
a6c9af87 AH |
1788 | |
1789 | if (plug) | |
1790 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1791 | else | |
1792 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1793 | ||
3ab2e420 | 1794 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 | 1795 | mutex_lock(&vq->mutex); |
ea16c514 | 1796 | if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG)) |
1a1ff825 | 1797 | vhost_scsi_send_evt(vs, tpg, lun, |
ea16c514 | 1798 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); |
a6c9af87 AH |
1799 | mutex_unlock(&vq->mutex); |
1800 | mutex_unlock(&vs->dev.mutex); | |
1801 | } | |
1802 | ||
1a1ff825 | 1803 | static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1804 | { |
1a1ff825 | 1805 | vhost_scsi_do_plug(tpg, lun, true); |
a6c9af87 AH |
1806 | } |
1807 | ||
1a1ff825 | 1808 | static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1809 | { |
1a1ff825 | 1810 | vhost_scsi_do_plug(tpg, lun, false); |
a6c9af87 AH |
1811 | } |
1812 | ||
1a1ff825 | 1813 | static int vhost_scsi_port_link(struct se_portal_group *se_tpg, |
683bd967 | 1814 | struct se_lun *lun) |
057cbf49 | 1815 | { |
1a1ff825 NB |
1816 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1817 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1818 | |
1a1ff825 | 1819 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1820 | |
98718312 AH |
1821 | mutex_lock(&tpg->tv_tpg_mutex); |
1822 | tpg->tv_tpg_port_count++; | |
1823 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 | 1824 | |
1a1ff825 | 1825 | vhost_scsi_hotplug(tpg, lun); |
a6c9af87 | 1826 | |
1a1ff825 | 1827 | mutex_unlock(&vhost_scsi_mutex); |
a6c9af87 | 1828 | |
057cbf49 NB |
1829 | return 0; |
1830 | } | |
1831 | ||
1a1ff825 | 1832 | static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg, |
683bd967 | 1833 | struct se_lun *lun) |
057cbf49 | 1834 | { |
1a1ff825 NB |
1835 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1836 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1837 | |
1a1ff825 | 1838 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1839 | |
98718312 AH |
1840 | mutex_lock(&tpg->tv_tpg_mutex); |
1841 | tpg->tv_tpg_port_count--; | |
1842 | mutex_unlock(&tpg->tv_tpg_mutex); | |
a6c9af87 | 1843 | |
1a1ff825 | 1844 | vhost_scsi_hotunplug(tpg, lun); |
a6c9af87 | 1845 | |
1a1ff825 | 1846 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 NB |
1847 | } |
1848 | ||
65ea7898 | 1849 | static void vhost_scsi_free_cmd_map_res(struct se_session *se_sess) |
3aee26b4 | 1850 | { |
1a1ff825 | 1851 | struct vhost_scsi_cmd *tv_cmd; |
3aee26b4 NB |
1852 | unsigned int i; |
1853 | ||
1854 | if (!se_sess->sess_cmd_map) | |
1855 | return; | |
1856 | ||
1a1ff825 NB |
1857 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1858 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 NB |
1859 | |
1860 | kfree(tv_cmd->tvc_sgl); | |
b1935f68 | 1861 | kfree(tv_cmd->tvc_prot_sgl); |
3aee26b4 NB |
1862 | kfree(tv_cmd->tvc_upages); |
1863 | } | |
1864 | } | |
1865 | ||
2eafd729 CH |
1866 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store( |
1867 | struct config_item *item, const char *page, size_t count) | |
b1d75fe5 | 1868 | { |
2eafd729 | 1869 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
b1d75fe5 NB |
1870 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1871 | struct vhost_scsi_tpg, se_tpg); | |
1872 | unsigned long val; | |
1873 | int ret = kstrtoul(page, 0, &val); | |
1874 | ||
1875 | if (ret) { | |
1876 | pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); | |
1877 | return ret; | |
1878 | } | |
1879 | if (val != 0 && val != 1 && val != 3) { | |
1880 | pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val); | |
1881 | return -EINVAL; | |
1882 | } | |
1883 | tpg->tv_fabric_prot_type = val; | |
1884 | ||
1885 | return count; | |
1886 | } | |
1887 | ||
2eafd729 CH |
1888 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show( |
1889 | struct config_item *item, char *page) | |
b1d75fe5 | 1890 | { |
2eafd729 | 1891 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
b1d75fe5 NB |
1892 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1893 | struct vhost_scsi_tpg, se_tpg); | |
1894 | ||
1895 | return sprintf(page, "%d\n", tpg->tv_fabric_prot_type); | |
1896 | } | |
2eafd729 CH |
1897 | |
1898 | CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type); | |
b1d75fe5 NB |
1899 | |
1900 | static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = { | |
2eafd729 | 1901 | &vhost_scsi_tpg_attrib_attr_fabric_prot_type, |
b1d75fe5 NB |
1902 | NULL, |
1903 | }; | |
1904 | ||
65ea7898 NB |
1905 | static int vhost_scsi_nexus_cb(struct se_portal_group *se_tpg, |
1906 | struct se_session *se_sess, void *p) | |
057cbf49 | 1907 | { |
1a1ff825 | 1908 | struct vhost_scsi_cmd *tv_cmd; |
3aee26b4 | 1909 | unsigned int i; |
057cbf49 | 1910 | |
1a1ff825 NB |
1911 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1912 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 | 1913 | |
6396bb22 KC |
1914 | tv_cmd->tvc_sgl = kcalloc(VHOST_SCSI_PREALLOC_SGLS, |
1915 | sizeof(struct scatterlist), | |
1916 | GFP_KERNEL); | |
3aee26b4 | 1917 | if (!tv_cmd->tvc_sgl) { |
3aee26b4 NB |
1918 | pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); |
1919 | goto out; | |
1920 | } | |
1921 | ||
6396bb22 KC |
1922 | tv_cmd->tvc_upages = kcalloc(VHOST_SCSI_PREALLOC_UPAGES, |
1923 | sizeof(struct page *), | |
1924 | GFP_KERNEL); | |
3aee26b4 | 1925 | if (!tv_cmd->tvc_upages) { |
3aee26b4 NB |
1926 | pr_err("Unable to allocate tv_cmd->tvc_upages\n"); |
1927 | goto out; | |
1928 | } | |
b1935f68 | 1929 | |
6396bb22 KC |
1930 | tv_cmd->tvc_prot_sgl = kcalloc(VHOST_SCSI_PREALLOC_PROT_SGLS, |
1931 | sizeof(struct scatterlist), | |
1932 | GFP_KERNEL); | |
b1935f68 | 1933 | if (!tv_cmd->tvc_prot_sgl) { |
b1935f68 NB |
1934 | pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); |
1935 | goto out; | |
1936 | } | |
3aee26b4 | 1937 | } |
65ea7898 NB |
1938 | return 0; |
1939 | out: | |
1940 | vhost_scsi_free_cmd_map_res(se_sess); | |
1941 | return -ENOMEM; | |
1942 | } | |
1943 | ||
1944 | static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg, | |
1945 | const char *name) | |
1946 | { | |
65ea7898 NB |
1947 | struct vhost_scsi_nexus *tv_nexus; |
1948 | ||
1949 | mutex_lock(&tpg->tv_tpg_mutex); | |
1950 | if (tpg->tpg_nexus) { | |
1951 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1952 | pr_debug("tpg->tpg_nexus already exists\n"); | |
1953 | return -EEXIST; | |
1954 | } | |
65ea7898 | 1955 | |
473f0b15 | 1956 | tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); |
65ea7898 NB |
1957 | if (!tv_nexus) { |
1958 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1959 | pr_err("Unable to allocate struct vhost_scsi_nexus\n"); | |
1960 | return -ENOMEM; | |
1961 | } | |
057cbf49 NB |
1962 | /* |
1963 | * Since we are running in 'demo mode' this call with generate a | |
1a1ff825 | 1964 | * struct se_node_acl for the vhost_scsi struct se_portal_group with |
057cbf49 NB |
1965 | * the SCSI Initiator port name of the passed configfs group 'name'. |
1966 | */ | |
fa834287 | 1967 | tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, |
65ea7898 NB |
1968 | VHOST_SCSI_DEFAULT_TAGS, |
1969 | sizeof(struct vhost_scsi_cmd), | |
1970 | TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS, | |
1971 | (unsigned char *)name, tv_nexus, | |
1972 | vhost_scsi_nexus_cb); | |
1973 | if (IS_ERR(tv_nexus->tvn_se_sess)) { | |
98718312 | 1974 | mutex_unlock(&tpg->tv_tpg_mutex); |
65ea7898 NB |
1975 | kfree(tv_nexus); |
1976 | return -ENOMEM; | |
057cbf49 | 1977 | } |
98718312 | 1978 | tpg->tpg_nexus = tv_nexus; |
057cbf49 | 1979 | |
98718312 | 1980 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1981 | return 0; |
1982 | } | |
1983 | ||
1a1ff825 | 1984 | static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg) |
057cbf49 NB |
1985 | { |
1986 | struct se_session *se_sess; | |
1a1ff825 | 1987 | struct vhost_scsi_nexus *tv_nexus; |
057cbf49 NB |
1988 | |
1989 | mutex_lock(&tpg->tv_tpg_mutex); | |
1990 | tv_nexus = tpg->tpg_nexus; | |
1991 | if (!tv_nexus) { | |
1992 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1993 | return -ENODEV; | |
1994 | } | |
1995 | ||
1996 | se_sess = tv_nexus->tvn_se_sess; | |
1997 | if (!se_sess) { | |
1998 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1999 | return -ENODEV; | |
2000 | } | |
2001 | ||
101998f6 | 2002 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 2003 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 2004 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 2005 | " active TPG port count: %d\n", |
101998f6 NB |
2006 | tpg->tv_tpg_port_count); |
2007 | return -EBUSY; | |
057cbf49 NB |
2008 | } |
2009 | ||
101998f6 | 2010 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 2011 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 2012 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 2013 | " active TPG vhost count: %d\n", |
101998f6 NB |
2014 | tpg->tv_tpg_vhost_count); |
2015 | return -EBUSY; | |
057cbf49 NB |
2016 | } |
2017 | ||
101998f6 | 2018 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
1a1ff825 | 2019 | " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport), |
057cbf49 | 2020 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
3aee26b4 | 2021 | |
65ea7898 | 2022 | vhost_scsi_free_cmd_map_res(se_sess); |
057cbf49 | 2023 | /* |
101998f6 | 2024 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 | 2025 | */ |
25b88550 | 2026 | target_remove_session(se_sess); |
057cbf49 NB |
2027 | tpg->tpg_nexus = NULL; |
2028 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2029 | ||
2030 | kfree(tv_nexus); | |
2031 | return 0; | |
2032 | } | |
2033 | ||
2eafd729 | 2034 | static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page) |
057cbf49 | 2035 | { |
2eafd729 | 2036 | struct se_portal_group *se_tpg = to_tpg(item); |
1a1ff825 NB |
2037 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2038 | struct vhost_scsi_tpg, se_tpg); | |
2039 | struct vhost_scsi_nexus *tv_nexus; | |
057cbf49 NB |
2040 | ssize_t ret; |
2041 | ||
98718312 AH |
2042 | mutex_lock(&tpg->tv_tpg_mutex); |
2043 | tv_nexus = tpg->tpg_nexus; | |
057cbf49 | 2044 | if (!tv_nexus) { |
98718312 | 2045 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2046 | return -ENODEV; |
2047 | } | |
2048 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
2049 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
98718312 | 2050 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2051 | |
2052 | return ret; | |
2053 | } | |
2054 | ||
2eafd729 CH |
2055 | static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item, |
2056 | const char *page, size_t count) | |
057cbf49 | 2057 | { |
2eafd729 | 2058 | struct se_portal_group *se_tpg = to_tpg(item); |
1a1ff825 NB |
2059 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2060 | struct vhost_scsi_tpg, se_tpg); | |
2061 | struct vhost_scsi_tport *tport_wwn = tpg->tport; | |
2062 | unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr; | |
057cbf49 NB |
2063 | int ret; |
2064 | /* | |
2065 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
2066 | */ | |
2067 | if (!strncmp(page, "NULL", 4)) { | |
1a1ff825 | 2068 | ret = vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
2069 | return (!ret) ? count : ret; |
2070 | } | |
2071 | /* | |
2072 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1a1ff825 NB |
2073 | * the fabric protocol_id set in vhost_scsi_make_tport(), and call |
2074 | * vhost_scsi_make_nexus(). | |
057cbf49 | 2075 | */ |
1a1ff825 | 2076 | if (strlen(page) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2077 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
1a1ff825 | 2078 | " max: %d\n", page, VHOST_SCSI_NAMELEN); |
057cbf49 NB |
2079 | return -EINVAL; |
2080 | } | |
1a1ff825 | 2081 | snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page); |
057cbf49 NB |
2082 | |
2083 | ptr = strstr(i_port, "naa."); | |
2084 | if (ptr) { | |
2085 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
2086 | pr_err("Passed SAS Initiator Port %s does not" | |
2087 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2088 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2089 | return -EINVAL; |
2090 | } | |
2091 | port_ptr = &i_port[0]; | |
2092 | goto check_newline; | |
2093 | } | |
2094 | ptr = strstr(i_port, "fc."); | |
2095 | if (ptr) { | |
2096 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
2097 | pr_err("Passed FCP Initiator Port %s does not" | |
2098 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2099 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2100 | return -EINVAL; |
2101 | } | |
2102 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
2103 | goto check_newline; | |
2104 | } | |
2105 | ptr = strstr(i_port, "iqn."); | |
2106 | if (ptr) { | |
2107 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
2108 | pr_err("Passed iSCSI Initiator Port %s does not" | |
2109 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2110 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2111 | return -EINVAL; |
2112 | } | |
2113 | port_ptr = &i_port[0]; | |
2114 | goto check_newline; | |
2115 | } | |
2116 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
2117 | " %s\n", i_port); | |
2118 | return -EINVAL; | |
2119 | /* | |
2120 | * Clear any trailing newline for the NAA WWN | |
2121 | */ | |
2122 | check_newline: | |
2123 | if (i_port[strlen(i_port)-1] == '\n') | |
2124 | i_port[strlen(i_port)-1] = '\0'; | |
2125 | ||
1a1ff825 | 2126 | ret = vhost_scsi_make_nexus(tpg, port_ptr); |
057cbf49 NB |
2127 | if (ret < 0) |
2128 | return ret; | |
2129 | ||
2130 | return count; | |
2131 | } | |
2132 | ||
2eafd729 | 2133 | CONFIGFS_ATTR(vhost_scsi_tpg_, nexus); |
057cbf49 | 2134 | |
1a1ff825 | 2135 | static struct configfs_attribute *vhost_scsi_tpg_attrs[] = { |
2eafd729 | 2136 | &vhost_scsi_tpg_attr_nexus, |
057cbf49 NB |
2137 | NULL, |
2138 | }; | |
2139 | ||
683bd967 | 2140 | static struct se_portal_group * |
aa090eab | 2141 | vhost_scsi_make_tpg(struct se_wwn *wwn, const char *name) |
057cbf49 | 2142 | { |
1a1ff825 NB |
2143 | struct vhost_scsi_tport *tport = container_of(wwn, |
2144 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 | 2145 | |
1a1ff825 | 2146 | struct vhost_scsi_tpg *tpg; |
59c816c1 | 2147 | u16 tpgt; |
057cbf49 NB |
2148 | int ret; |
2149 | ||
2150 | if (strstr(name, "tpgt_") != name) | |
2151 | return ERR_PTR(-EINVAL); | |
59c816c1 | 2152 | if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET) |
057cbf49 NB |
2153 | return ERR_PTR(-EINVAL); |
2154 | ||
473f0b15 | 2155 | tpg = kzalloc(sizeof(*tpg), GFP_KERNEL); |
057cbf49 | 2156 | if (!tpg) { |
1a1ff825 | 2157 | pr_err("Unable to allocate struct vhost_scsi_tpg"); |
057cbf49 NB |
2158 | return ERR_PTR(-ENOMEM); |
2159 | } | |
2160 | mutex_init(&tpg->tv_tpg_mutex); | |
2161 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
2162 | tpg->tport = tport; | |
2163 | tpg->tport_tpgt = tpgt; | |
2164 | ||
bc0c94b1 | 2165 | ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id); |
057cbf49 NB |
2166 | if (ret < 0) { |
2167 | kfree(tpg); | |
2168 | return NULL; | |
2169 | } | |
1a1ff825 NB |
2170 | mutex_lock(&vhost_scsi_mutex); |
2171 | list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list); | |
2172 | mutex_unlock(&vhost_scsi_mutex); | |
057cbf49 NB |
2173 | |
2174 | return &tpg->se_tpg; | |
2175 | } | |
2176 | ||
1a1ff825 | 2177 | static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg) |
057cbf49 | 2178 | { |
1a1ff825 NB |
2179 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2180 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 2181 | |
1a1ff825 | 2182 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 2183 | list_del(&tpg->tv_tpg_list); |
1a1ff825 | 2184 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 2185 | /* |
101998f6 | 2186 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 | 2187 | */ |
1a1ff825 | 2188 | vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
2189 | /* |
2190 | * Deregister the se_tpg from TCM.. | |
2191 | */ | |
2192 | core_tpg_deregister(se_tpg); | |
2193 | kfree(tpg); | |
2194 | } | |
2195 | ||
683bd967 | 2196 | static struct se_wwn * |
1a1ff825 | 2197 | vhost_scsi_make_tport(struct target_fabric_configfs *tf, |
683bd967 AH |
2198 | struct config_group *group, |
2199 | const char *name) | |
057cbf49 | 2200 | { |
1a1ff825 | 2201 | struct vhost_scsi_tport *tport; |
057cbf49 NB |
2202 | char *ptr; |
2203 | u64 wwpn = 0; | |
2204 | int off = 0; | |
2205 | ||
1a1ff825 | 2206 | /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0) |
057cbf49 NB |
2207 | return ERR_PTR(-EINVAL); */ |
2208 | ||
473f0b15 | 2209 | tport = kzalloc(sizeof(*tport), GFP_KERNEL); |
057cbf49 | 2210 | if (!tport) { |
1a1ff825 | 2211 | pr_err("Unable to allocate struct vhost_scsi_tport"); |
057cbf49 NB |
2212 | return ERR_PTR(-ENOMEM); |
2213 | } | |
2214 | tport->tport_wwpn = wwpn; | |
2215 | /* | |
2216 | * Determine the emulated Protocol Identifier and Target Port Name | |
2217 | * based on the incoming configfs directory name. | |
2218 | */ | |
2219 | ptr = strstr(name, "naa."); | |
2220 | if (ptr) { | |
2221 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
2222 | goto check_len; | |
2223 | } | |
2224 | ptr = strstr(name, "fc."); | |
2225 | if (ptr) { | |
2226 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
2227 | off = 3; /* Skip over "fc." */ | |
2228 | goto check_len; | |
2229 | } | |
2230 | ptr = strstr(name, "iqn."); | |
2231 | if (ptr) { | |
2232 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
2233 | goto check_len; | |
2234 | } | |
2235 | ||
2236 | pr_err("Unable to locate prefix for emulated Target Port:" | |
2237 | " %s\n", name); | |
2238 | kfree(tport); | |
2239 | return ERR_PTR(-EINVAL); | |
2240 | ||
2241 | check_len: | |
1a1ff825 | 2242 | if (strlen(name) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2243 | pr_err("Emulated %s Address: %s, exceeds" |
1a1ff825 NB |
2244 | " max: %d\n", name, vhost_scsi_dump_proto_id(tport), |
2245 | VHOST_SCSI_NAMELEN); | |
057cbf49 NB |
2246 | kfree(tport); |
2247 | return ERR_PTR(-EINVAL); | |
2248 | } | |
1a1ff825 | 2249 | snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]); |
057cbf49 NB |
2250 | |
2251 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
1a1ff825 | 2252 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name); |
057cbf49 NB |
2253 | |
2254 | return &tport->tport_wwn; | |
2255 | } | |
2256 | ||
1a1ff825 | 2257 | static void vhost_scsi_drop_tport(struct se_wwn *wwn) |
057cbf49 | 2258 | { |
1a1ff825 NB |
2259 | struct vhost_scsi_tport *tport = container_of(wwn, |
2260 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 NB |
2261 | |
2262 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
1a1ff825 | 2263 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), |
057cbf49 NB |
2264 | tport->tport_name); |
2265 | ||
2266 | kfree(tport); | |
2267 | } | |
2268 | ||
683bd967 | 2269 | static ssize_t |
2eafd729 | 2270 | vhost_scsi_wwn_version_show(struct config_item *item, char *page) |
057cbf49 NB |
2271 | { |
2272 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" | |
1a1ff825 | 2273 | "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 NB |
2274 | utsname()->machine); |
2275 | } | |
2276 | ||
2eafd729 | 2277 | CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version); |
057cbf49 | 2278 | |
1a1ff825 | 2279 | static struct configfs_attribute *vhost_scsi_wwn_attrs[] = { |
2eafd729 | 2280 | &vhost_scsi_wwn_attr_version, |
057cbf49 NB |
2281 | NULL, |
2282 | }; | |
2283 | ||
1d822a40 | 2284 | static const struct target_core_fabric_ops vhost_scsi_ops = { |
9ac8928e | 2285 | .module = THIS_MODULE, |
30c7ca93 | 2286 | .fabric_name = "vhost", |
1a1ff825 NB |
2287 | .tpg_get_wwn = vhost_scsi_get_fabric_wwn, |
2288 | .tpg_get_tag = vhost_scsi_get_tpgt, | |
1a1ff825 NB |
2289 | .tpg_check_demo_mode = vhost_scsi_check_true, |
2290 | .tpg_check_demo_mode_cache = vhost_scsi_check_true, | |
2291 | .tpg_check_demo_mode_write_protect = vhost_scsi_check_false, | |
2292 | .tpg_check_prod_mode_write_protect = vhost_scsi_check_false, | |
b1d75fe5 | 2293 | .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only, |
1a1ff825 NB |
2294 | .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index, |
2295 | .release_cmd = vhost_scsi_release_cmd, | |
084ed45b | 2296 | .check_stop_free = vhost_scsi_check_stop_free, |
1a1ff825 | 2297 | .sess_get_index = vhost_scsi_sess_get_index, |
057cbf49 | 2298 | .sess_get_initiator_sid = NULL, |
1a1ff825 | 2299 | .write_pending = vhost_scsi_write_pending, |
1a1ff825 | 2300 | .set_default_node_attributes = vhost_scsi_set_default_node_attrs, |
1a1ff825 NB |
2301 | .get_cmd_state = vhost_scsi_get_cmd_state, |
2302 | .queue_data_in = vhost_scsi_queue_data_in, | |
2303 | .queue_status = vhost_scsi_queue_status, | |
2304 | .queue_tm_rsp = vhost_scsi_queue_tm_rsp, | |
2305 | .aborted_task = vhost_scsi_aborted_task, | |
057cbf49 NB |
2306 | /* |
2307 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
2308 | */ | |
1a1ff825 NB |
2309 | .fabric_make_wwn = vhost_scsi_make_tport, |
2310 | .fabric_drop_wwn = vhost_scsi_drop_tport, | |
2311 | .fabric_make_tpg = vhost_scsi_make_tpg, | |
2312 | .fabric_drop_tpg = vhost_scsi_drop_tpg, | |
2313 | .fabric_post_link = vhost_scsi_port_link, | |
2314 | .fabric_pre_unlink = vhost_scsi_port_unlink, | |
9ac8928e CH |
2315 | |
2316 | .tfc_wwn_attrs = vhost_scsi_wwn_attrs, | |
2317 | .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs, | |
2318 | .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs, | |
057cbf49 NB |
2319 | }; |
2320 | ||
9ac8928e | 2321 | static int __init vhost_scsi_init(void) |
057cbf49 | 2322 | { |
9ac8928e | 2323 | int ret = -ENOMEM; |
057cbf49 | 2324 | |
9ac8928e | 2325 | pr_debug("TCM_VHOST fabric module %s on %s/%s" |
1a1ff825 | 2326 | " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 | 2327 | utsname()->machine); |
057cbf49 | 2328 | |
101998f6 NB |
2329 | /* |
2330 | * Use our own dedicated workqueue for submitting I/O into | |
2331 | * target core to avoid contention within system_wq. | |
2332 | */ | |
1a1ff825 NB |
2333 | vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0); |
2334 | if (!vhost_scsi_workqueue) | |
057cbf49 NB |
2335 | goto out; |
2336 | ||
2337 | ret = vhost_scsi_register(); | |
2338 | if (ret < 0) | |
2339 | goto out_destroy_workqueue; | |
2340 | ||
9ac8928e | 2341 | ret = target_register_template(&vhost_scsi_ops); |
057cbf49 NB |
2342 | if (ret < 0) |
2343 | goto out_vhost_scsi_deregister; | |
2344 | ||
2345 | return 0; | |
2346 | ||
2347 | out_vhost_scsi_deregister: | |
2348 | vhost_scsi_deregister(); | |
2349 | out_destroy_workqueue: | |
1a1ff825 | 2350 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2351 | out: |
2352 | return ret; | |
2353 | }; | |
2354 | ||
1a1ff825 | 2355 | static void vhost_scsi_exit(void) |
057cbf49 | 2356 | { |
9ac8928e | 2357 | target_unregister_template(&vhost_scsi_ops); |
057cbf49 | 2358 | vhost_scsi_deregister(); |
1a1ff825 | 2359 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2360 | }; |
2361 | ||
181c04a3 MT |
2362 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
2363 | MODULE_ALIAS("tcm_vhost"); | |
057cbf49 | 2364 | MODULE_LICENSE("GPL"); |
1a1ff825 NB |
2365 | module_init(vhost_scsi_init); |
2366 | module_exit(vhost_scsi_exit); |