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 | 59 | |
e82b9b07 JW |
60 | /* Max number of requests before requeueing the job. |
61 | * Using this limit prevents one virtqueue from starving others with | |
62 | * request. | |
63 | */ | |
64 | #define VHOST_SCSI_WEIGHT 256 | |
65 | ||
5012a3a3 MT |
66 | struct vhost_scsi_inflight { |
67 | /* Wait for the flush operation to finish */ | |
68 | struct completion comp; | |
69 | /* Refcount for the inflight reqs */ | |
70 | struct kref kref; | |
71 | }; | |
72 | ||
1a1ff825 | 73 | struct vhost_scsi_cmd { |
5012a3a3 MT |
74 | /* Descriptor from vhost_get_vq_desc() for virt_queue segment */ |
75 | int tvc_vq_desc; | |
76 | /* virtio-scsi initiator task attribute */ | |
77 | int tvc_task_attr; | |
79c14141 NB |
78 | /* virtio-scsi response incoming iovecs */ |
79 | int tvc_in_iovs; | |
5012a3a3 MT |
80 | /* virtio-scsi initiator data direction */ |
81 | enum dma_data_direction tvc_data_direction; | |
82 | /* Expected data transfer length from virtio-scsi header */ | |
83 | u32 tvc_exp_data_len; | |
84 | /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */ | |
85 | u64 tvc_tag; | |
86 | /* The number of scatterlists associated with this cmd */ | |
87 | u32 tvc_sgl_count; | |
e31885dd | 88 | u32 tvc_prot_sgl_count; |
1a1ff825 | 89 | /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */ |
5012a3a3 MT |
90 | u32 tvc_lun; |
91 | /* Pointer to the SGL formatted memory from virtio-scsi */ | |
92 | struct scatterlist *tvc_sgl; | |
b1935f68 | 93 | struct scatterlist *tvc_prot_sgl; |
3aee26b4 | 94 | struct page **tvc_upages; |
79c14141 | 95 | /* Pointer to response header iovec */ |
a77ec83a | 96 | struct iovec tvc_resp_iov; |
5012a3a3 MT |
97 | /* Pointer to vhost_scsi for our device */ |
98 | struct vhost_scsi *tvc_vhost; | |
99 | /* Pointer to vhost_virtqueue for the cmd */ | |
100 | struct vhost_virtqueue *tvc_vq; | |
101 | /* Pointer to vhost nexus memory */ | |
1a1ff825 | 102 | struct vhost_scsi_nexus *tvc_nexus; |
5012a3a3 MT |
103 | /* The TCM I/O descriptor that is accessed via container_of() */ |
104 | struct se_cmd tvc_se_cmd; | |
1a1ff825 | 105 | /* work item used for cmwq dispatch to vhost_scsi_submission_work() */ |
5012a3a3 MT |
106 | struct work_struct work; |
107 | /* Copy of the incoming SCSI command descriptor block (CDB) */ | |
1a1ff825 | 108 | unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE]; |
5012a3a3 MT |
109 | /* Sense buffer that will be mapped into outgoing status */ |
110 | unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER]; | |
111 | /* Completed commands list, serviced from vhost worker thread */ | |
112 | struct llist_node tvc_completion_list; | |
113 | /* Used to track inflight cmd */ | |
114 | struct vhost_scsi_inflight *inflight; | |
115 | }; | |
116 | ||
1a1ff825 | 117 | struct vhost_scsi_nexus { |
5012a3a3 MT |
118 | /* Pointer to TCM session for I_T Nexus */ |
119 | struct se_session *tvn_se_sess; | |
120 | }; | |
121 | ||
1a1ff825 | 122 | struct vhost_scsi_tpg { |
5012a3a3 MT |
123 | /* Vhost port target portal group tag for TCM */ |
124 | u16 tport_tpgt; | |
125 | /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */ | |
126 | int tv_tpg_port_count; | |
127 | /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */ | |
128 | int tv_tpg_vhost_count; | |
b1d75fe5 NB |
129 | /* Used for enabling T10-PI with legacy devices */ |
130 | int tv_fabric_prot_type; | |
1a1ff825 | 131 | /* list for vhost_scsi_list */ |
5012a3a3 MT |
132 | struct list_head tv_tpg_list; |
133 | /* Used to protect access for tpg_nexus */ | |
134 | struct mutex tv_tpg_mutex; | |
135 | /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */ | |
1a1ff825 NB |
136 | struct vhost_scsi_nexus *tpg_nexus; |
137 | /* Pointer back to vhost_scsi_tport */ | |
138 | struct vhost_scsi_tport *tport; | |
139 | /* Returned by vhost_scsi_make_tpg() */ | |
5012a3a3 MT |
140 | struct se_portal_group se_tpg; |
141 | /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */ | |
142 | struct vhost_scsi *vhost_scsi; | |
143 | }; | |
144 | ||
1a1ff825 | 145 | struct vhost_scsi_tport { |
5012a3a3 MT |
146 | /* SCSI protocol the tport is providing */ |
147 | u8 tport_proto_id; | |
148 | /* Binary World Wide unique Port Name for Vhost Target port */ | |
149 | u64 tport_wwpn; | |
150 | /* ASCII formatted WWPN for Vhost Target port */ | |
1a1ff825 NB |
151 | char tport_name[VHOST_SCSI_NAMELEN]; |
152 | /* Returned by vhost_scsi_make_tport() */ | |
5012a3a3 MT |
153 | struct se_wwn tport_wwn; |
154 | }; | |
155 | ||
1a1ff825 | 156 | struct vhost_scsi_evt { |
5012a3a3 MT |
157 | /* event to be sent to guest */ |
158 | struct virtio_scsi_event event; | |
159 | /* event list, serviced from vhost worker thread */ | |
160 | struct llist_node list; | |
161 | }; | |
057cbf49 | 162 | |
101998f6 NB |
163 | enum { |
164 | VHOST_SCSI_VQ_CTL = 0, | |
165 | VHOST_SCSI_VQ_EVT = 1, | |
166 | VHOST_SCSI_VQ_IO = 2, | |
167 | }; | |
168 | ||
e72fd72e | 169 | /* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */ |
5dade710 | 170 | enum { |
95e7c434 | 171 | VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) | |
4e9fa50c | 172 | (1ULL << VIRTIO_SCSI_F_T10_PI) |
5dade710 NB |
173 | }; |
174 | ||
1b7f390e AH |
175 | #define VHOST_SCSI_MAX_TARGET 256 |
176 | #define VHOST_SCSI_MAX_VQ 128 | |
a6c9af87 | 177 | #define VHOST_SCSI_MAX_EVENT 128 |
67e18cf9 | 178 | |
3ab2e420 AH |
179 | struct vhost_scsi_virtqueue { |
180 | struct vhost_virtqueue vq; | |
3dfbff32 MT |
181 | /* |
182 | * Reference counting for inflight reqs, used for flush operation. At | |
183 | * each time, one reference tracks new commands submitted, while we | |
184 | * wait for another one to reach 0. | |
185 | */ | |
f2f0173d | 186 | struct vhost_scsi_inflight inflights[2]; |
3dfbff32 MT |
187 | /* |
188 | * Indicate current inflight in use, protected by vq->mutex. | |
189 | * Writers must also take dev mutex and flush under it. | |
190 | */ | |
f2f0173d | 191 | int inflight_idx; |
3ab2e420 AH |
192 | }; |
193 | ||
057cbf49 | 194 | struct vhost_scsi { |
67e18cf9 | 195 | /* Protected by vhost_scsi->dev.mutex */ |
1a1ff825 | 196 | struct vhost_scsi_tpg **vs_tpg; |
67e18cf9 | 197 | char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
67e18cf9 | 198 | |
057cbf49 | 199 | struct vhost_dev dev; |
3ab2e420 | 200 | struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ]; |
057cbf49 NB |
201 | |
202 | struct vhost_work vs_completion_work; /* cmd completion work item */ | |
9d6064a3 | 203 | struct llist_head vs_completion_list; /* cmd completion queue */ |
a6c9af87 AH |
204 | |
205 | struct vhost_work vs_event_work; /* evt injection work item */ | |
206 | struct llist_head vs_event_list; /* evt injection queue */ | |
207 | ||
208 | bool vs_events_missed; /* any missed events, protected by vq->mutex */ | |
209 | int vs_events_nr; /* num of pending events, protected by vq->mutex */ | |
057cbf49 NB |
210 | }; |
211 | ||
3f8ca2e1 BM |
212 | /* |
213 | * Context for processing request and control queue operations. | |
214 | */ | |
215 | struct vhost_scsi_ctx { | |
216 | int head; | |
217 | unsigned int out, in; | |
218 | size_t req_size, rsp_size; | |
219 | size_t out_size, in_size; | |
220 | u8 *target, *lunp; | |
221 | void *req; | |
222 | struct iov_iter out_iter; | |
223 | }; | |
224 | ||
1a1ff825 | 225 | static struct workqueue_struct *vhost_scsi_workqueue; |
057cbf49 | 226 | |
1a1ff825 NB |
227 | /* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */ |
228 | static DEFINE_MUTEX(vhost_scsi_mutex); | |
229 | static LIST_HEAD(vhost_scsi_list); | |
057cbf49 | 230 | |
1a1ff825 | 231 | static void vhost_scsi_done_inflight(struct kref *kref) |
f2f0173d AH |
232 | { |
233 | struct vhost_scsi_inflight *inflight; | |
234 | ||
235 | inflight = container_of(kref, struct vhost_scsi_inflight, kref); | |
236 | complete(&inflight->comp); | |
237 | } | |
238 | ||
1a1ff825 | 239 | static void vhost_scsi_init_inflight(struct vhost_scsi *vs, |
f2f0173d AH |
240 | struct vhost_scsi_inflight *old_inflight[]) |
241 | { | |
242 | struct vhost_scsi_inflight *new_inflight; | |
243 | struct vhost_virtqueue *vq; | |
244 | int idx, i; | |
245 | ||
246 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
247 | vq = &vs->vqs[i].vq; | |
248 | ||
249 | mutex_lock(&vq->mutex); | |
250 | ||
251 | /* store old infight */ | |
252 | idx = vs->vqs[i].inflight_idx; | |
253 | if (old_inflight) | |
254 | old_inflight[i] = &vs->vqs[i].inflights[idx]; | |
255 | ||
256 | /* setup new infight */ | |
257 | vs->vqs[i].inflight_idx = idx ^ 1; | |
258 | new_inflight = &vs->vqs[i].inflights[idx ^ 1]; | |
259 | kref_init(&new_inflight->kref); | |
260 | init_completion(&new_inflight->comp); | |
261 | ||
262 | mutex_unlock(&vq->mutex); | |
263 | } | |
264 | } | |
265 | ||
266 | static struct vhost_scsi_inflight * | |
1a1ff825 | 267 | vhost_scsi_get_inflight(struct vhost_virtqueue *vq) |
f2f0173d AH |
268 | { |
269 | struct vhost_scsi_inflight *inflight; | |
270 | struct vhost_scsi_virtqueue *svq; | |
271 | ||
272 | svq = container_of(vq, struct vhost_scsi_virtqueue, vq); | |
273 | inflight = &svq->inflights[svq->inflight_idx]; | |
274 | kref_get(&inflight->kref); | |
275 | ||
276 | return inflight; | |
277 | } | |
278 | ||
1a1ff825 | 279 | static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight) |
f2f0173d | 280 | { |
1a1ff825 | 281 | kref_put(&inflight->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
282 | } |
283 | ||
1a1ff825 | 284 | static int vhost_scsi_check_true(struct se_portal_group *se_tpg) |
057cbf49 NB |
285 | { |
286 | return 1; | |
287 | } | |
288 | ||
1a1ff825 | 289 | static int vhost_scsi_check_false(struct se_portal_group *se_tpg) |
057cbf49 NB |
290 | { |
291 | return 0; | |
292 | } | |
293 | ||
1a1ff825 | 294 | static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg) |
057cbf49 | 295 | { |
1a1ff825 NB |
296 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
297 | struct vhost_scsi_tpg, se_tpg); | |
298 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
299 | |
300 | return &tport->tport_name[0]; | |
301 | } | |
302 | ||
1a1ff825 | 303 | static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg) |
057cbf49 | 304 | { |
1a1ff825 NB |
305 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
306 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 NB |
307 | return tpg->tport_tpgt; |
308 | } | |
309 | ||
b1d75fe5 NB |
310 | static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg) |
311 | { | |
312 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, | |
313 | struct vhost_scsi_tpg, se_tpg); | |
314 | ||
315 | return tpg->tv_fabric_prot_type; | |
316 | } | |
317 | ||
1a1ff825 | 318 | static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg) |
057cbf49 NB |
319 | { |
320 | return 1; | |
321 | } | |
322 | ||
1a1ff825 | 323 | static void vhost_scsi_release_cmd(struct se_cmd *se_cmd) |
057cbf49 | 324 | { |
1a1ff825 NB |
325 | struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd, |
326 | struct vhost_scsi_cmd, tvc_se_cmd); | |
de1419e4 | 327 | struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess; |
e31885dd | 328 | int i; |
084ed45b NB |
329 | |
330 | if (tv_cmd->tvc_sgl_count) { | |
084ed45b NB |
331 | for (i = 0; i < tv_cmd->tvc_sgl_count; i++) |
332 | put_page(sg_page(&tv_cmd->tvc_sgl[i])); | |
d3d665a6 | 333 | } |
e31885dd NB |
334 | if (tv_cmd->tvc_prot_sgl_count) { |
335 | for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++) | |
336 | put_page(sg_page(&tv_cmd->tvc_prot_sgl[i])); | |
337 | } | |
084ed45b | 338 | |
1a1ff825 | 339 | vhost_scsi_put_inflight(tv_cmd->inflight); |
83c2b54b | 340 | target_free_tag(se_sess, se_cmd); |
057cbf49 NB |
341 | } |
342 | ||
1a1ff825 | 343 | static u32 vhost_scsi_sess_get_index(struct se_session *se_sess) |
057cbf49 NB |
344 | { |
345 | return 0; | |
346 | } | |
347 | ||
1a1ff825 | 348 | static int vhost_scsi_write_pending(struct se_cmd *se_cmd) |
057cbf49 NB |
349 | { |
350 | /* Go ahead and process the write immediately */ | |
351 | target_execute_cmd(se_cmd); | |
352 | return 0; | |
353 | } | |
354 | ||
1a1ff825 | 355 | static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl) |
057cbf49 NB |
356 | { |
357 | return; | |
358 | } | |
359 | ||
1a1ff825 | 360 | static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd) |
057cbf49 NB |
361 | { |
362 | return 0; | |
363 | } | |
364 | ||
1a1ff825 | 365 | static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd) |
101998f6 | 366 | { |
3c63f66a | 367 | struct vhost_scsi *vs = cmd->tvc_vhost; |
101998f6 | 368 | |
3c63f66a | 369 | llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
101998f6 NB |
370 | |
371 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
372 | } | |
057cbf49 | 373 | |
1a1ff825 | 374 | static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd) |
057cbf49 | 375 | { |
1a1ff825 NB |
376 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
377 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 378 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
379 | return 0; |
380 | } | |
381 | ||
1a1ff825 | 382 | static int vhost_scsi_queue_status(struct se_cmd *se_cmd) |
057cbf49 | 383 | { |
1a1ff825 NB |
384 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
385 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 386 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
387 | return 0; |
388 | } | |
389 | ||
1a1ff825 | 390 | static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd) |
057cbf49 | 391 | { |
b79fafac | 392 | return; |
057cbf49 NB |
393 | } |
394 | ||
1a1ff825 | 395 | static void vhost_scsi_aborted_task(struct se_cmd *se_cmd) |
131e6abc NB |
396 | { |
397 | return; | |
398 | } | |
399 | ||
1a1ff825 | 400 | static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 AH |
401 | { |
402 | vs->vs_events_nr--; | |
403 | kfree(evt); | |
404 | } | |
405 | ||
1a1ff825 NB |
406 | static struct vhost_scsi_evt * |
407 | vhost_scsi_allocate_evt(struct vhost_scsi *vs, | |
683bd967 | 408 | u32 event, u32 reason) |
a6c9af87 | 409 | { |
3ab2e420 | 410 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
1a1ff825 | 411 | struct vhost_scsi_evt *evt; |
a6c9af87 AH |
412 | |
413 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
414 | vs->vs_events_missed = true; | |
415 | return NULL; | |
416 | } | |
417 | ||
418 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
419 | if (!evt) { | |
1a1ff825 | 420 | vq_err(vq, "Failed to allocate vhost_scsi_evt\n"); |
a6c9af87 AH |
421 | vs->vs_events_missed = true; |
422 | return NULL; | |
423 | } | |
424 | ||
e72fd72e MT |
425 | evt->event.event = cpu_to_vhost32(vq, event); |
426 | evt->event.reason = cpu_to_vhost32(vq, reason); | |
a6c9af87 AH |
427 | vs->vs_events_nr++; |
428 | ||
429 | return evt; | |
430 | } | |
431 | ||
1a1ff825 | 432 | static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd) |
057cbf49 | 433 | { |
3c63f66a | 434 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
435 | |
436 | /* TODO locking against target/backend threads? */ | |
6c131d0c | 437 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 438 | |
084ed45b | 439 | } |
f2f0173d | 440 | |
084ed45b NB |
441 | static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) |
442 | { | |
afc16604 | 443 | return target_put_sess_cmd(se_cmd); |
057cbf49 NB |
444 | } |
445 | ||
683bd967 | 446 | static void |
1a1ff825 | 447 | vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 | 448 | { |
3ab2e420 | 449 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
450 | struct virtio_scsi_event *event = &evt->event; |
451 | struct virtio_scsi_event __user *eventp; | |
452 | unsigned out, in; | |
453 | int head, ret; | |
454 | ||
455 | if (!vq->private_data) { | |
456 | vs->vs_events_missed = true; | |
457 | return; | |
458 | } | |
459 | ||
460 | again: | |
461 | vhost_disable_notify(&vs->dev, vq); | |
47283bef | 462 | head = vhost_get_vq_desc(vq, vq->iov, |
a6c9af87 AH |
463 | ARRAY_SIZE(vq->iov), &out, &in, |
464 | NULL, NULL); | |
465 | if (head < 0) { | |
466 | vs->vs_events_missed = true; | |
467 | return; | |
468 | } | |
469 | if (head == vq->num) { | |
470 | if (vhost_enable_notify(&vs->dev, vq)) | |
471 | goto again; | |
472 | vs->vs_events_missed = true; | |
473 | return; | |
474 | } | |
475 | ||
476 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { | |
477 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", | |
478 | vq->iov[out].iov_len); | |
479 | vs->vs_events_missed = true; | |
480 | return; | |
481 | } | |
482 | ||
483 | if (vs->vs_events_missed) { | |
e72fd72e | 484 | event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED); |
a6c9af87 AH |
485 | vs->vs_events_missed = false; |
486 | } | |
487 | ||
488 | eventp = vq->iov[out].iov_base; | |
489 | ret = __copy_to_user(eventp, event, sizeof(*event)); | |
490 | if (!ret) | |
491 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
492 | else | |
1a1ff825 | 493 | vq_err(vq, "Faulted on vhost_scsi_send_event\n"); |
a6c9af87 AH |
494 | } |
495 | ||
1a1ff825 | 496 | static void vhost_scsi_evt_work(struct vhost_work *work) |
a6c9af87 AH |
497 | { |
498 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
499 | vs_event_work); | |
3ab2e420 | 500 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
12bdcbd5 | 501 | struct vhost_scsi_evt *evt, *t; |
a6c9af87 AH |
502 | struct llist_node *llnode; |
503 | ||
504 | mutex_lock(&vq->mutex); | |
505 | llnode = llist_del_all(&vs->vs_event_list); | |
12bdcbd5 | 506 | llist_for_each_entry_safe(evt, t, llnode, list) { |
1a1ff825 NB |
507 | vhost_scsi_do_evt_work(vs, evt); |
508 | vhost_scsi_free_evt(vs, evt); | |
a6c9af87 AH |
509 | } |
510 | mutex_unlock(&vq->mutex); | |
511 | } | |
512 | ||
057cbf49 NB |
513 | /* Fill in status and signal that we are done processing this command |
514 | * | |
515 | * This is scheduled in the vhost work queue so we are called with the owner | |
516 | * process mm and can access the vring. | |
517 | */ | |
518 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) | |
519 | { | |
520 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
521 | vs_completion_work); | |
1b7f390e | 522 | DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 523 | struct virtio_scsi_cmd_resp v_rsp; |
816e85ed | 524 | struct vhost_scsi_cmd *cmd, *t; |
9d6064a3 AH |
525 | struct llist_node *llnode; |
526 | struct se_cmd *se_cmd; | |
79c14141 | 527 | struct iov_iter iov_iter; |
1b7f390e | 528 | int ret, vq; |
057cbf49 | 529 | |
1b7f390e | 530 | bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 531 | llnode = llist_del_all(&vs->vs_completion_list); |
816e85ed | 532 | llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) { |
3c63f66a | 533 | se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
534 | |
535 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
3c63f66a | 536 | cmd, se_cmd->residual_count, se_cmd->scsi_status); |
057cbf49 NB |
537 | |
538 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
e72fd72e | 539 | v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count); |
057cbf49 NB |
540 | /* TODO is status_qualifier field needed? */ |
541 | v_rsp.status = se_cmd->scsi_status; | |
e72fd72e MT |
542 | v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq, |
543 | se_cmd->scsi_sense_length); | |
3c63f66a | 544 | memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
e72fd72e | 545 | se_cmd->scsi_sense_length); |
79c14141 | 546 | |
a77ec83a | 547 | iov_iter_init(&iov_iter, READ, &cmd->tvc_resp_iov, |
79c14141 NB |
548 | cmd->tvc_in_iovs, sizeof(v_rsp)); |
549 | ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter); | |
550 | if (likely(ret == sizeof(v_rsp))) { | |
3ab2e420 | 551 | struct vhost_scsi_virtqueue *q; |
3c63f66a AH |
552 | vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
553 | q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); | |
3ab2e420 | 554 | vq = q - vs->vqs; |
1b7f390e AH |
555 | __set_bit(vq, signal); |
556 | } else | |
057cbf49 NB |
557 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
558 | ||
3c63f66a | 559 | vhost_scsi_free_cmd(cmd); |
057cbf49 NB |
560 | } |
561 | ||
1b7f390e AH |
562 | vq = -1; |
563 | while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) | |
564 | < VHOST_SCSI_MAX_VQ) | |
3ab2e420 | 565 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
566 | } |
567 | ||
1a1ff825 NB |
568 | static struct vhost_scsi_cmd * |
569 | vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg, | |
95e7c434 NB |
570 | unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr, |
571 | u32 exp_data_len, int data_direction) | |
057cbf49 | 572 | { |
1a1ff825 NB |
573 | struct vhost_scsi_cmd *cmd; |
574 | struct vhost_scsi_nexus *tv_nexus; | |
4824d3bf | 575 | struct se_session *se_sess; |
b1935f68 | 576 | struct scatterlist *sg, *prot_sg; |
3aee26b4 | 577 | struct page **pages; |
10e9cbb6 | 578 | int tag, cpu; |
057cbf49 | 579 | |
98718312 | 580 | tv_nexus = tpg->tpg_nexus; |
057cbf49 | 581 | if (!tv_nexus) { |
1a1ff825 | 582 | pr_err("Unable to locate active struct vhost_scsi_nexus\n"); |
057cbf49 NB |
583 | return ERR_PTR(-EIO); |
584 | } | |
4824d3bf | 585 | se_sess = tv_nexus->tvn_se_sess; |
057cbf49 | 586 | |
10e9cbb6 | 587 | tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); |
4a47d3a1 | 588 | if (tag < 0) { |
1a1ff825 | 589 | pr_err("Unable to obtain tag for vhost_scsi_cmd\n"); |
4a47d3a1 NB |
590 | return ERR_PTR(-ENOMEM); |
591 | } | |
592 | ||
1a1ff825 | 593 | cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag]; |
3aee26b4 | 594 | sg = cmd->tvc_sgl; |
b1935f68 | 595 | prot_sg = cmd->tvc_prot_sgl; |
3aee26b4 | 596 | pages = cmd->tvc_upages; |
473f0b15 | 597 | memset(cmd, 0, sizeof(*cmd)); |
3aee26b4 | 598 | cmd->tvc_sgl = sg; |
b1935f68 | 599 | cmd->tvc_prot_sgl = prot_sg; |
3aee26b4 | 600 | cmd->tvc_upages = pages; |
4824d3bf | 601 | cmd->tvc_se_cmd.map_tag = tag; |
10e9cbb6 | 602 | cmd->tvc_se_cmd.map_cpu = cpu; |
95e7c434 NB |
603 | cmd->tvc_tag = scsi_tag; |
604 | cmd->tvc_lun = lun; | |
605 | cmd->tvc_task_attr = task_attr; | |
3c63f66a AH |
606 | cmd->tvc_exp_data_len = exp_data_len; |
607 | cmd->tvc_data_direction = data_direction; | |
608 | cmd->tvc_nexus = tv_nexus; | |
1a1ff825 | 609 | cmd->inflight = vhost_scsi_get_inflight(vq); |
3c63f66a | 610 | |
1a1ff825 | 611 | memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE); |
95e7c434 | 612 | |
3c63f66a | 613 | return cmd; |
057cbf49 NB |
614 | } |
615 | ||
616 | /* | |
617 | * Map a user memory range into a scatterlist | |
618 | * | |
619 | * Returns the number of scatterlist entries used or -errno on error. | |
620 | */ | |
683bd967 | 621 | static int |
1a1ff825 | 622 | vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd, |
2f240c4a | 623 | struct iov_iter *iter, |
3aee26b4 | 624 | struct scatterlist *sgl, |
5a01d082 | 625 | bool write) |
057cbf49 | 626 | { |
b4078b5f | 627 | struct page **pages = cmd->tvc_upages; |
2f240c4a AV |
628 | struct scatterlist *sg = sgl; |
629 | ssize_t bytes; | |
630 | size_t offset; | |
631 | unsigned int npages = 0; | |
3aee26b4 | 632 | |
2f240c4a AV |
633 | bytes = iov_iter_get_pages(iter, pages, LONG_MAX, |
634 | VHOST_SCSI_PREALLOC_UPAGES, &offset); | |
1810053e | 635 | /* No pages were pinned */ |
2f240c4a AV |
636 | if (bytes <= 0) |
637 | return bytes < 0 ? bytes : -EFAULT; | |
1810053e | 638 | |
2f240c4a | 639 | iov_iter_advance(iter, bytes); |
057cbf49 | 640 | |
2f240c4a AV |
641 | while (bytes) { |
642 | unsigned n = min_t(unsigned, PAGE_SIZE - offset, bytes); | |
643 | sg_set_page(sg++, pages[npages++], n, offset); | |
644 | bytes -= n; | |
645 | offset = 0; | |
646 | } | |
647 | return npages; | |
057cbf49 NB |
648 | } |
649 | ||
683bd967 | 650 | static int |
e8de56b5 | 651 | vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls) |
057cbf49 | 652 | { |
e8de56b5 | 653 | int sgl_count = 0; |
057cbf49 | 654 | |
e8de56b5 NB |
655 | if (!iter || !iter->iov) { |
656 | pr_err("%s: iter->iov is NULL, but expected bytes: %zu" | |
657 | " present\n", __func__, bytes); | |
658 | return -EINVAL; | |
659 | } | |
f3158f36 | 660 | |
e8de56b5 NB |
661 | sgl_count = iov_iter_npages(iter, 0xffff); |
662 | if (sgl_count > max_sgls) { | |
663 | pr_err("%s: requested sgl_count: %d exceeds pre-allocated" | |
664 | " max_sgls: %d\n", __func__, sgl_count, max_sgls); | |
665 | return -EINVAL; | |
5a01d082 | 666 | } |
e8de56b5 NB |
667 | return sgl_count; |
668 | } | |
057cbf49 | 669 | |
e8de56b5 | 670 | static int |
1a1ff825 NB |
671 | vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write, |
672 | struct iov_iter *iter, | |
673 | struct scatterlist *sg, int sg_count) | |
e8de56b5 | 674 | { |
11d49e9d | 675 | struct scatterlist *p = sg; |
2f240c4a | 676 | int ret; |
5a01d082 | 677 | |
2f240c4a AV |
678 | while (iov_iter_count(iter)) { |
679 | ret = vhost_scsi_map_to_sgl(cmd, iter, sg, write); | |
057cbf49 | 680 | if (ret < 0) { |
11d49e9d AV |
681 | while (p < sg) { |
682 | struct page *page = sg_page(p++); | |
e8de56b5 NB |
683 | if (page) |
684 | put_page(page); | |
685 | } | |
057cbf49 NB |
686 | return ret; |
687 | } | |
057cbf49 | 688 | sg += ret; |
057cbf49 NB |
689 | } |
690 | return 0; | |
691 | } | |
692 | ||
e31885dd | 693 | static int |
1a1ff825 | 694 | vhost_scsi_mapal(struct vhost_scsi_cmd *cmd, |
e8de56b5 NB |
695 | size_t prot_bytes, struct iov_iter *prot_iter, |
696 | size_t data_bytes, struct iov_iter *data_iter) | |
697 | { | |
698 | int sgl_count, ret; | |
699 | bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE); | |
700 | ||
701 | if (prot_bytes) { | |
702 | sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes, | |
1a1ff825 | 703 | VHOST_SCSI_PREALLOC_PROT_SGLS); |
e8de56b5 NB |
704 | if (sgl_count < 0) |
705 | return sgl_count; | |
706 | ||
707 | sg_init_table(cmd->tvc_prot_sgl, sgl_count); | |
708 | cmd->tvc_prot_sgl_count = sgl_count; | |
709 | pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__, | |
710 | cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count); | |
711 | ||
712 | ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter, | |
713 | cmd->tvc_prot_sgl, | |
714 | cmd->tvc_prot_sgl_count); | |
e31885dd | 715 | if (ret < 0) { |
e31885dd NB |
716 | cmd->tvc_prot_sgl_count = 0; |
717 | return ret; | |
718 | } | |
e8de56b5 NB |
719 | } |
720 | sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes, | |
1a1ff825 | 721 | VHOST_SCSI_PREALLOC_SGLS); |
e8de56b5 NB |
722 | if (sgl_count < 0) |
723 | return sgl_count; | |
724 | ||
725 | sg_init_table(cmd->tvc_sgl, sgl_count); | |
726 | cmd->tvc_sgl_count = sgl_count; | |
727 | pr_debug("%s data_sg %p data_sgl_count %u\n", __func__, | |
728 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
729 | ||
730 | ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter, | |
731 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
732 | if (ret < 0) { | |
733 | cmd->tvc_sgl_count = 0; | |
734 | return ret; | |
e31885dd NB |
735 | } |
736 | return 0; | |
737 | } | |
738 | ||
46243860 NB |
739 | static int vhost_scsi_to_tcm_attr(int attr) |
740 | { | |
741 | switch (attr) { | |
742 | case VIRTIO_SCSI_S_SIMPLE: | |
743 | return TCM_SIMPLE_TAG; | |
744 | case VIRTIO_SCSI_S_ORDERED: | |
745 | return TCM_ORDERED_TAG; | |
746 | case VIRTIO_SCSI_S_HEAD: | |
747 | return TCM_HEAD_TAG; | |
748 | case VIRTIO_SCSI_S_ACA: | |
749 | return TCM_ACA_TAG; | |
750 | default: | |
751 | break; | |
752 | } | |
753 | return TCM_SIMPLE_TAG; | |
754 | } | |
755 | ||
1a1ff825 | 756 | static void vhost_scsi_submission_work(struct work_struct *work) |
057cbf49 | 757 | { |
1a1ff825 NB |
758 | struct vhost_scsi_cmd *cmd = |
759 | container_of(work, struct vhost_scsi_cmd, work); | |
760 | struct vhost_scsi_nexus *tv_nexus; | |
3c63f66a | 761 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
95e7c434 NB |
762 | struct scatterlist *sg_ptr, *sg_prot_ptr = NULL; |
763 | int rc; | |
057cbf49 | 764 | |
95e7c434 | 765 | /* FIXME: BIDI operation */ |
3c63f66a AH |
766 | if (cmd->tvc_sgl_count) { |
767 | sg_ptr = cmd->tvc_sgl; | |
95e7c434 NB |
768 | |
769 | if (cmd->tvc_prot_sgl_count) | |
770 | sg_prot_ptr = cmd->tvc_prot_sgl; | |
771 | else | |
772 | se_cmd->prot_pto = true; | |
057cbf49 NB |
773 | } else { |
774 | sg_ptr = NULL; | |
775 | } | |
3c63f66a | 776 | tv_nexus = cmd->tvc_nexus; |
9f0abc15 | 777 | |
649ee054 | 778 | se_cmd->tag = 0; |
9f0abc15 | 779 | rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, |
3c63f66a AH |
780 | cmd->tvc_cdb, &cmd->tvc_sense_buf[0], |
781 | cmd->tvc_lun, cmd->tvc_exp_data_len, | |
46243860 NB |
782 | vhost_scsi_to_tcm_attr(cmd->tvc_task_attr), |
783 | cmd->tvc_data_direction, TARGET_SCF_ACK_KREF, | |
784 | sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr, | |
785 | cmd->tvc_prot_sgl_count); | |
057cbf49 NB |
786 | if (rc < 0) { |
787 | transport_send_check_condition_and_sense(se_cmd, | |
9f0abc15 | 788 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
057cbf49 | 789 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 790 | } |
057cbf49 NB |
791 | } |
792 | ||
683bd967 AH |
793 | static void |
794 | vhost_scsi_send_bad_target(struct vhost_scsi *vs, | |
795 | struct vhost_virtqueue *vq, | |
796 | int head, unsigned out) | |
637ab21e AH |
797 | { |
798 | struct virtio_scsi_cmd_resp __user *resp; | |
799 | struct virtio_scsi_cmd_resp rsp; | |
800 | int ret; | |
801 | ||
802 | memset(&rsp, 0, sizeof(rsp)); | |
803 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
804 | resp = vq->iov[out].iov_base; | |
805 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
806 | if (!ret) | |
807 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
808 | else | |
809 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
810 | } | |
811 | ||
09d75832 BM |
812 | static int |
813 | vhost_scsi_get_desc(struct vhost_scsi *vs, struct vhost_virtqueue *vq, | |
814 | struct vhost_scsi_ctx *vc) | |
815 | { | |
816 | int ret = -ENXIO; | |
817 | ||
818 | vc->head = vhost_get_vq_desc(vq, vq->iov, | |
819 | ARRAY_SIZE(vq->iov), &vc->out, &vc->in, | |
820 | NULL, NULL); | |
821 | ||
822 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", | |
823 | vc->head, vc->out, vc->in); | |
824 | ||
825 | /* On error, stop handling until the next kick. */ | |
826 | if (unlikely(vc->head < 0)) | |
827 | goto done; | |
828 | ||
829 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
830 | if (vc->head == vq->num) { | |
831 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
832 | vhost_disable_notify(&vs->dev, vq); | |
833 | ret = -EAGAIN; | |
834 | } | |
835 | goto done; | |
836 | } | |
837 | ||
838 | /* | |
839 | * Get the size of request and response buffers. | |
840 | * FIXME: Not correct for BIDI operation | |
841 | */ | |
842 | vc->out_size = iov_length(vq->iov, vc->out); | |
843 | vc->in_size = iov_length(&vq->iov[vc->out], vc->in); | |
844 | ||
845 | /* | |
846 | * Copy over the virtio-scsi request header, which for a | |
847 | * ANY_LAYOUT enabled guest may span multiple iovecs, or a | |
848 | * single iovec may contain both the header + outgoing | |
849 | * WRITE payloads. | |
850 | * | |
851 | * copy_from_iter() will advance out_iter, so that it will | |
852 | * point at the start of the outgoing WRITE payload, if | |
853 | * DMA_TO_DEVICE is set. | |
854 | */ | |
855 | iov_iter_init(&vc->out_iter, WRITE, vq->iov, vc->out, vc->out_size); | |
856 | ret = 0; | |
857 | ||
858 | done: | |
859 | return ret; | |
860 | } | |
861 | ||
862 | static int | |
863 | vhost_scsi_chk_size(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc) | |
864 | { | |
865 | if (unlikely(vc->in_size < vc->rsp_size)) { | |
866 | vq_err(vq, | |
867 | "Response buf too small, need min %zu bytes got %zu", | |
868 | vc->rsp_size, vc->in_size); | |
869 | return -EINVAL; | |
870 | } else if (unlikely(vc->out_size < vc->req_size)) { | |
871 | vq_err(vq, | |
872 | "Request buf too small, need min %zu bytes got %zu", | |
873 | vc->req_size, vc->out_size); | |
874 | return -EIO; | |
875 | } | |
876 | ||
877 | return 0; | |
878 | } | |
879 | ||
880 | static int | |
881 | vhost_scsi_get_req(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc, | |
882 | struct vhost_scsi_tpg **tpgp) | |
883 | { | |
884 | int ret = -EIO; | |
885 | ||
886 | if (unlikely(!copy_from_iter_full(vc->req, vc->req_size, | |
887 | &vc->out_iter))) { | |
a691ffb4 | 888 | vq_err(vq, "Faulted on copy_from_iter_full\n"); |
09d75832 BM |
889 | } else if (unlikely(*vc->lunp != 1)) { |
890 | /* virtio-scsi spec requires byte 0 of the lun to be 1 */ | |
891 | vq_err(vq, "Illegal virtio-scsi lun: %u\n", *vc->lunp); | |
892 | } else { | |
893 | struct vhost_scsi_tpg **vs_tpg, *tpg; | |
894 | ||
895 | vs_tpg = vq->private_data; /* validated at handler entry */ | |
896 | ||
897 | tpg = READ_ONCE(vs_tpg[*vc->target]); | |
898 | if (unlikely(!tpg)) { | |
899 | vq_err(vq, "Target 0x%x does not exist\n", *vc->target); | |
900 | } else { | |
901 | if (tpgp) | |
902 | *tpgp = tpg; | |
903 | ret = 0; | |
904 | } | |
905 | } | |
906 | ||
907 | return ret; | |
908 | } | |
909 | ||
683bd967 AH |
910 | static void |
911 | vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
057cbf49 | 912 | { |
1a1ff825 | 913 | struct vhost_scsi_tpg **vs_tpg, *tpg; |
057cbf49 | 914 | struct virtio_scsi_cmd_req v_req; |
95e7c434 | 915 | struct virtio_scsi_cmd_req_pi v_req_pi; |
09d75832 | 916 | struct vhost_scsi_ctx vc; |
1a1ff825 | 917 | struct vhost_scsi_cmd *cmd; |
09d75832 | 918 | struct iov_iter in_iter, prot_iter, data_iter; |
95e7c434 | 919 | u64 tag; |
09b13fa8 | 920 | u32 exp_data_len, data_direction; |
c1ea02f1 | 921 | int ret, prot_bytes, c = 0; |
95e7c434 | 922 | u16 lun; |
09d75832 | 923 | u8 task_attr; |
09b13fa8 | 924 | bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI); |
09d75832 | 925 | void *cdb; |
057cbf49 | 926 | |
e7802212 | 927 | mutex_lock(&vq->mutex); |
4f7f46d3 AH |
928 | /* |
929 | * We can handle the vq only after the endpoint is setup by calling the | |
930 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
4f7f46d3 | 931 | */ |
e7802212 | 932 | vs_tpg = vq->private_data; |
4f7f46d3 | 933 | if (!vs_tpg) |
e7802212 | 934 | goto out; |
057cbf49 | 935 | |
09d75832 BM |
936 | memset(&vc, 0, sizeof(vc)); |
937 | vc.rsp_size = sizeof(struct virtio_scsi_cmd_resp); | |
938 | ||
057cbf49 NB |
939 | vhost_disable_notify(&vs->dev, vq); |
940 | ||
c1ea02f1 | 941 | do { |
09d75832 BM |
942 | ret = vhost_scsi_get_desc(vs, vq, &vc); |
943 | if (ret) | |
944 | goto err; | |
945 | ||
09b13fa8 NB |
946 | /* |
947 | * Setup pointers and values based upon different virtio-scsi | |
948 | * request header if T10_PI is enabled in KVM guest. | |
949 | */ | |
950 | if (t10_pi) { | |
09d75832 BM |
951 | vc.req = &v_req_pi; |
952 | vc.req_size = sizeof(v_req_pi); | |
953 | vc.lunp = &v_req_pi.lun[0]; | |
954 | vc.target = &v_req_pi.lun[1]; | |
95e7c434 | 955 | } else { |
09d75832 BM |
956 | vc.req = &v_req; |
957 | vc.req_size = sizeof(v_req); | |
958 | vc.lunp = &v_req.lun[0]; | |
959 | vc.target = &v_req.lun[1]; | |
95e7c434 NB |
960 | } |
961 | ||
09b13fa8 | 962 | /* |
09d75832 BM |
963 | * Validate the size of request and response buffers. |
964 | * Check for a sane response buffer so we can report | |
965 | * early errors back to the guest. | |
09b13fa8 | 966 | */ |
09d75832 BM |
967 | ret = vhost_scsi_chk_size(vq, &vc); |
968 | if (ret) | |
969 | goto err; | |
057cbf49 | 970 | |
09d75832 BM |
971 | ret = vhost_scsi_get_req(vq, &vc, &tpg); |
972 | if (ret) | |
973 | goto err; | |
974 | ||
975 | ret = -EIO; /* bad target on any error from here on */ | |
7fe412d0 | 976 | |
95e7c434 | 977 | /* |
09b13fa8 NB |
978 | * Determine data_direction by calculating the total outgoing |
979 | * iovec sizes + incoming iovec sizes vs. virtio-scsi request + | |
980 | * response headers respectively. | |
95e7c434 | 981 | * |
09b13fa8 NB |
982 | * For DMA_TO_DEVICE this is out_iter, which is already pointing |
983 | * to the right place. | |
984 | * | |
985 | * For DMA_FROM_DEVICE, the iovec will be just past the end | |
986 | * of the virtio-scsi response header in either the same | |
987 | * or immediately following iovec. | |
95e7c434 | 988 | * |
09b13fa8 NB |
989 | * Any associated T10_PI bytes for the outgoing / incoming |
990 | * payloads are included in calculation of exp_data_len here. | |
95e7c434 | 991 | */ |
09b13fa8 NB |
992 | prot_bytes = 0; |
993 | ||
09d75832 | 994 | if (vc.out_size > vc.req_size) { |
09b13fa8 | 995 | data_direction = DMA_TO_DEVICE; |
09d75832 BM |
996 | exp_data_len = vc.out_size - vc.req_size; |
997 | data_iter = vc.out_iter; | |
998 | } else if (vc.in_size > vc.rsp_size) { | |
09b13fa8 | 999 | data_direction = DMA_FROM_DEVICE; |
09d75832 | 1000 | exp_data_len = vc.in_size - vc.rsp_size; |
09b13fa8 | 1001 | |
09d75832 BM |
1002 | iov_iter_init(&in_iter, READ, &vq->iov[vc.out], vc.in, |
1003 | vc.rsp_size + exp_data_len); | |
1004 | iov_iter_advance(&in_iter, vc.rsp_size); | |
09b13fa8 NB |
1005 | data_iter = in_iter; |
1006 | } else { | |
1007 | data_direction = DMA_NONE; | |
1008 | exp_data_len = 0; | |
1009 | } | |
1010 | /* | |
1011 | * If T10_PI header + payload is present, setup prot_iter values | |
1012 | * and recalculate data_iter for vhost_scsi_mapal() mapping to | |
1013 | * host scatterlists via get_user_pages_fast(). | |
95e7c434 | 1014 | */ |
09b13fa8 | 1015 | if (t10_pi) { |
95e7c434 NB |
1016 | if (v_req_pi.pi_bytesout) { |
1017 | if (data_direction != DMA_TO_DEVICE) { | |
09b13fa8 NB |
1018 | vq_err(vq, "Received non zero pi_bytesout," |
1019 | " but wrong data_direction\n"); | |
09d75832 | 1020 | goto err; |
95e7c434 | 1021 | } |
e72fd72e | 1022 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout); |
95e7c434 NB |
1023 | } else if (v_req_pi.pi_bytesin) { |
1024 | if (data_direction != DMA_FROM_DEVICE) { | |
09b13fa8 NB |
1025 | vq_err(vq, "Received non zero pi_bytesin," |
1026 | " but wrong data_direction\n"); | |
09d75832 | 1027 | goto err; |
95e7c434 | 1028 | } |
e72fd72e | 1029 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin); |
95e7c434 | 1030 | } |
09b13fa8 | 1031 | /* |
4542d623 GE |
1032 | * Set prot_iter to data_iter and truncate it to |
1033 | * prot_bytes, and advance data_iter past any | |
09b13fa8 NB |
1034 | * preceeding prot_bytes that may be present. |
1035 | * | |
1036 | * Also fix up the exp_data_len to reflect only the | |
1037 | * actual data payload length. | |
1038 | */ | |
95e7c434 | 1039 | if (prot_bytes) { |
09b13fa8 NB |
1040 | exp_data_len -= prot_bytes; |
1041 | prot_iter = data_iter; | |
4542d623 | 1042 | iov_iter_truncate(&prot_iter, prot_bytes); |
09b13fa8 | 1043 | iov_iter_advance(&data_iter, prot_bytes); |
95e7c434 | 1044 | } |
e72fd72e | 1045 | tag = vhost64_to_cpu(vq, v_req_pi.tag); |
95e7c434 NB |
1046 | task_attr = v_req_pi.task_attr; |
1047 | cdb = &v_req_pi.cdb[0]; | |
1048 | lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF; | |
1049 | } else { | |
e72fd72e | 1050 | tag = vhost64_to_cpu(vq, v_req.tag); |
95e7c434 NB |
1051 | task_attr = v_req.task_attr; |
1052 | cdb = &v_req.cdb[0]; | |
1053 | lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; | |
1054 | } | |
95e7c434 | 1055 | /* |
09b13fa8 NB |
1056 | * Check that the received CDB size does not exceeded our |
1057 | * hardcoded max for vhost-scsi, then get a pre-allocated | |
1058 | * cmd descriptor for the new virtio-scsi tag. | |
95e7c434 NB |
1059 | * |
1060 | * TODO what if cdb was too small for varlen cdb header? | |
1061 | */ | |
1a1ff825 | 1062 | if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) { |
95e7c434 NB |
1063 | vq_err(vq, "Received SCSI CDB with command_size: %d that" |
1064 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
1a1ff825 | 1065 | scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE); |
09d75832 | 1066 | goto err; |
95e7c434 | 1067 | } |
95e7c434 | 1068 | cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr, |
9f977ef7 NB |
1069 | exp_data_len + prot_bytes, |
1070 | data_direction); | |
3c63f66a | 1071 | if (IS_ERR(cmd)) { |
4824d3bf | 1072 | vq_err(vq, "vhost_scsi_get_tag failed %ld\n", |
09b13fa8 | 1073 | PTR_ERR(cmd)); |
09d75832 | 1074 | goto err; |
057cbf49 | 1075 | } |
3c63f66a AH |
1076 | cmd->tvc_vhost = vs; |
1077 | cmd->tvc_vq = vq; | |
09d75832 BM |
1078 | cmd->tvc_resp_iov = vq->iov[vc.out]; |
1079 | cmd->tvc_in_iovs = vc.in; | |
057cbf49 | 1080 | |
057cbf49 | 1081 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", |
09b13fa8 NB |
1082 | cmd->tvc_cdb[0], cmd->tvc_lun); |
1083 | pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:" | |
1084 | " %d\n", cmd, exp_data_len, prot_bytes, data_direction); | |
057cbf49 NB |
1085 | |
1086 | if (data_direction != DMA_NONE) { | |
09d75832 BM |
1087 | if (unlikely(vhost_scsi_mapal(cmd, prot_bytes, |
1088 | &prot_iter, exp_data_len, | |
1089 | &data_iter))) { | |
057cbf49 | 1090 | vq_err(vq, "Failed to map iov to sgl\n"); |
1a1ff825 | 1091 | vhost_scsi_release_cmd(&cmd->tvc_se_cmd); |
09d75832 | 1092 | goto err; |
057cbf49 NB |
1093 | } |
1094 | } | |
057cbf49 NB |
1095 | /* |
1096 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
1097 | * complete the virtio-scsi request in TCM callback context via | |
09b13fa8 | 1098 | * vhost_scsi_queue_data_in() and vhost_scsi_queue_status() |
057cbf49 | 1099 | */ |
09d75832 | 1100 | cmd->tvc_vq_desc = vc.head; |
057cbf49 | 1101 | /* |
09b13fa8 NB |
1102 | * Dispatch cmd descriptor for cmwq execution in process |
1103 | * context provided by vhost_scsi_workqueue. This also ensures | |
1104 | * cmd is executed on the same kworker CPU as this vhost | |
1105 | * thread to gain positive L2 cache locality effects. | |
057cbf49 | 1106 | */ |
1a1ff825 NB |
1107 | INIT_WORK(&cmd->work, vhost_scsi_submission_work); |
1108 | queue_work(vhost_scsi_workqueue, &cmd->work); | |
09d75832 BM |
1109 | ret = 0; |
1110 | err: | |
1111 | /* | |
1112 | * ENXIO: No more requests, or read error, wait for next kick | |
1113 | * EINVAL: Invalid response buffer, drop the request | |
1114 | * EIO: Respond with bad target | |
1115 | * EAGAIN: Pending request | |
1116 | */ | |
1117 | if (ret == -ENXIO) | |
1118 | break; | |
1119 | else if (ret == -EIO) | |
1120 | vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out); | |
c1ea02f1 | 1121 | } while (likely(!vhost_exceeds_weight(vq, ++c, 0))); |
e7802212 | 1122 | out: |
7ea206cf | 1123 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
1124 | } |
1125 | ||
0d02dbd6 | 1126 | static void |
09d75832 BM |
1127 | vhost_scsi_send_tmf_reject(struct vhost_scsi *vs, |
1128 | struct vhost_virtqueue *vq, | |
1129 | struct vhost_scsi_ctx *vc) | |
0d02dbd6 | 1130 | { |
0d02dbd6 | 1131 | struct virtio_scsi_ctrl_tmf_resp rsp; |
8e5dadfe | 1132 | struct iov_iter iov_iter; |
0d02dbd6 BM |
1133 | int ret; |
1134 | ||
1135 | pr_debug("%s\n", __func__); | |
1136 | memset(&rsp, 0, sizeof(rsp)); | |
1137 | rsp.response = VIRTIO_SCSI_S_FUNCTION_REJECTED; | |
8e5dadfe BM |
1138 | |
1139 | iov_iter_init(&iov_iter, READ, &vq->iov[vc->out], vc->in, sizeof(rsp)); | |
1140 | ||
1141 | ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter); | |
1142 | if (likely(ret == sizeof(rsp))) | |
3f8ca2e1 | 1143 | vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0); |
0d02dbd6 BM |
1144 | else |
1145 | pr_err("Faulted on virtio_scsi_ctrl_tmf_resp\n"); | |
1146 | } | |
1147 | ||
1148 | static void | |
1149 | vhost_scsi_send_an_resp(struct vhost_scsi *vs, | |
3f8ca2e1 BM |
1150 | struct vhost_virtqueue *vq, |
1151 | struct vhost_scsi_ctx *vc) | |
0d02dbd6 | 1152 | { |
0d02dbd6 | 1153 | struct virtio_scsi_ctrl_an_resp rsp; |
8e5dadfe | 1154 | struct iov_iter iov_iter; |
0d02dbd6 BM |
1155 | int ret; |
1156 | ||
1157 | pr_debug("%s\n", __func__); | |
1158 | memset(&rsp, 0, sizeof(rsp)); /* event_actual = 0 */ | |
1159 | rsp.response = VIRTIO_SCSI_S_OK; | |
8e5dadfe BM |
1160 | |
1161 | iov_iter_init(&iov_iter, READ, &vq->iov[vc->out], vc->in, sizeof(rsp)); | |
1162 | ||
1163 | ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter); | |
1164 | if (likely(ret == sizeof(rsp))) | |
3f8ca2e1 | 1165 | vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0); |
0d02dbd6 BM |
1166 | else |
1167 | pr_err("Faulted on virtio_scsi_ctrl_an_resp\n"); | |
1168 | } | |
1169 | ||
1170 | static void | |
1171 | vhost_scsi_ctl_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
1172 | { | |
1173 | union { | |
1174 | __virtio32 type; | |
1175 | struct virtio_scsi_ctrl_an_req an; | |
1176 | struct virtio_scsi_ctrl_tmf_req tmf; | |
1177 | } v_req; | |
3f8ca2e1 BM |
1178 | struct vhost_scsi_ctx vc; |
1179 | size_t typ_size; | |
c1ea02f1 | 1180 | int ret, c = 0; |
0d02dbd6 BM |
1181 | |
1182 | mutex_lock(&vq->mutex); | |
1183 | /* | |
1184 | * We can handle the vq only after the endpoint is setup by calling the | |
1185 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
1186 | */ | |
1187 | if (!vq->private_data) | |
1188 | goto out; | |
1189 | ||
3f8ca2e1 BM |
1190 | memset(&vc, 0, sizeof(vc)); |
1191 | ||
0d02dbd6 BM |
1192 | vhost_disable_notify(&vs->dev, vq); |
1193 | ||
c1ea02f1 | 1194 | do { |
3f8ca2e1 BM |
1195 | ret = vhost_scsi_get_desc(vs, vq, &vc); |
1196 | if (ret) | |
1197 | goto err; | |
0d02dbd6 BM |
1198 | |
1199 | /* | |
3f8ca2e1 BM |
1200 | * Get the request type first in order to setup |
1201 | * other parameters dependent on the type. | |
0d02dbd6 | 1202 | */ |
3f8ca2e1 | 1203 | vc.req = &v_req.type; |
0d02dbd6 BM |
1204 | typ_size = sizeof(v_req.type); |
1205 | ||
3f8ca2e1 BM |
1206 | if (unlikely(!copy_from_iter_full(vc.req, typ_size, |
1207 | &vc.out_iter))) { | |
0d02dbd6 BM |
1208 | vq_err(vq, "Faulted on copy_from_iter tmf type\n"); |
1209 | /* | |
3f8ca2e1 BM |
1210 | * The size of the response buffer depends on the |
1211 | * request type and must be validated against it. | |
0d02dbd6 BM |
1212 | * Since the request type is not known, don't send |
1213 | * a response. | |
1214 | */ | |
1215 | continue; | |
1216 | } | |
1217 | ||
1218 | switch (v_req.type) { | |
1219 | case VIRTIO_SCSI_T_TMF: | |
3f8ca2e1 BM |
1220 | vc.req = &v_req.tmf; |
1221 | vc.req_size = sizeof(struct virtio_scsi_ctrl_tmf_req); | |
1222 | vc.rsp_size = sizeof(struct virtio_scsi_ctrl_tmf_resp); | |
1223 | vc.lunp = &v_req.tmf.lun[0]; | |
1224 | vc.target = &v_req.tmf.lun[1]; | |
0d02dbd6 BM |
1225 | break; |
1226 | case VIRTIO_SCSI_T_AN_QUERY: | |
1227 | case VIRTIO_SCSI_T_AN_SUBSCRIBE: | |
3f8ca2e1 BM |
1228 | vc.req = &v_req.an; |
1229 | vc.req_size = sizeof(struct virtio_scsi_ctrl_an_req); | |
1230 | vc.rsp_size = sizeof(struct virtio_scsi_ctrl_an_resp); | |
1231 | vc.lunp = &v_req.an.lun[0]; | |
1232 | vc.target = NULL; | |
0d02dbd6 BM |
1233 | break; |
1234 | default: | |
1235 | vq_err(vq, "Unknown control request %d", v_req.type); | |
1236 | continue; | |
1237 | } | |
1238 | ||
1239 | /* | |
3f8ca2e1 BM |
1240 | * Validate the size of request and response buffers. |
1241 | * Check for a sane response buffer so we can report | |
1242 | * early errors back to the guest. | |
0d02dbd6 | 1243 | */ |
3f8ca2e1 BM |
1244 | ret = vhost_scsi_chk_size(vq, &vc); |
1245 | if (ret) | |
1246 | goto err; | |
0d02dbd6 | 1247 | |
3f8ca2e1 BM |
1248 | /* |
1249 | * Get the rest of the request now that its size is known. | |
1250 | */ | |
1251 | vc.req += typ_size; | |
1252 | vc.req_size -= typ_size; | |
0d02dbd6 | 1253 | |
3f8ca2e1 BM |
1254 | ret = vhost_scsi_get_req(vq, &vc, NULL); |
1255 | if (ret) | |
1256 | goto err; | |
0d02dbd6 | 1257 | |
3f8ca2e1 | 1258 | if (v_req.type == VIRTIO_SCSI_T_TMF) |
09d75832 | 1259 | vhost_scsi_send_tmf_reject(vs, vq, &vc); |
3f8ca2e1 BM |
1260 | else |
1261 | vhost_scsi_send_an_resp(vs, vq, &vc); | |
1262 | err: | |
1263 | /* | |
1264 | * ENXIO: No more requests, or read error, wait for next kick | |
1265 | * EINVAL: Invalid response buffer, drop the request | |
1266 | * EIO: Respond with bad target | |
1267 | * EAGAIN: Pending request | |
1268 | */ | |
1269 | if (ret == -ENXIO) | |
1270 | break; | |
1271 | else if (ret == -EIO) | |
1272 | vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out); | |
c1ea02f1 | 1273 | } while (likely(!vhost_exceeds_weight(vq, ++c, 0))); |
0d02dbd6 BM |
1274 | out: |
1275 | mutex_unlock(&vq->mutex); | |
1276 | } | |
1277 | ||
057cbf49 NB |
1278 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) |
1279 | { | |
0d02dbd6 BM |
1280 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1281 | poll.work); | |
1282 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1283 | ||
101998f6 | 1284 | pr_debug("%s: The handling func for control queue.\n", __func__); |
0d02dbd6 | 1285 | vhost_scsi_ctl_handle_vq(vs, vq); |
057cbf49 NB |
1286 | } |
1287 | ||
683bd967 | 1288 | static void |
1a1ff825 NB |
1289 | vhost_scsi_send_evt(struct vhost_scsi *vs, |
1290 | struct vhost_scsi_tpg *tpg, | |
683bd967 AH |
1291 | struct se_lun *lun, |
1292 | u32 event, | |
1293 | u32 reason) | |
a6c9af87 | 1294 | { |
1a1ff825 | 1295 | struct vhost_scsi_evt *evt; |
a6c9af87 | 1296 | |
1a1ff825 | 1297 | evt = vhost_scsi_allocate_evt(vs, event, reason); |
a6c9af87 AH |
1298 | if (!evt) |
1299 | return; | |
1300 | ||
1301 | if (tpg && lun) { | |
1302 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
1303 | /* | |
1304 | * Note: evt->event is zeroed when we allocate it and | |
1305 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
1306 | */ | |
1307 | evt->event.lun[0] = 0x01; | |
59c816c1 | 1308 | evt->event.lun[1] = tpg->tport_tpgt; |
a6c9af87 AH |
1309 | if (lun->unpacked_lun >= 256) |
1310 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
1311 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
1312 | } | |
1313 | ||
1314 | llist_add(&evt->list, &vs->vs_event_list); | |
1315 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
1316 | } | |
1317 | ||
057cbf49 NB |
1318 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
1319 | { | |
a6c9af87 AH |
1320 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1321 | poll.work); | |
1322 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1323 | ||
1324 | mutex_lock(&vq->mutex); | |
1325 | if (!vq->private_data) | |
1326 | goto out; | |
1327 | ||
1328 | if (vs->vs_events_missed) | |
1a1ff825 | 1329 | vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); |
a6c9af87 AH |
1330 | out: |
1331 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
1332 | } |
1333 | ||
1334 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
1335 | { | |
1336 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
1337 | poll.work); | |
1338 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1339 | ||
1b7f390e | 1340 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
1341 | } |
1342 | ||
4f7f46d3 AH |
1343 | static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
1344 | { | |
3ab2e420 | 1345 | vhost_poll_flush(&vs->vqs[index].vq.poll); |
4f7f46d3 AH |
1346 | } |
1347 | ||
3dfbff32 | 1348 | /* Callers must hold dev mutex */ |
4f7f46d3 AH |
1349 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
1350 | { | |
f2f0173d | 1351 | struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; |
4f7f46d3 AH |
1352 | int i; |
1353 | ||
f2f0173d | 1354 | /* Init new inflight and remember the old inflight */ |
1a1ff825 | 1355 | vhost_scsi_init_inflight(vs, old_inflight); |
f2f0173d AH |
1356 | |
1357 | /* | |
1358 | * The inflight->kref was initialized to 1. We decrement it here to | |
1359 | * indicate the start of the flush operation so that it will reach 0 | |
1360 | * when all the reqs are finished. | |
1361 | */ | |
1362 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1a1ff825 | 1363 | kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
1364 | |
1365 | /* Flush both the vhost poll and vhost work */ | |
4f7f46d3 AH |
1366 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
1367 | vhost_scsi_flush_vq(vs, i); | |
1368 | vhost_work_flush(&vs->dev, &vs->vs_completion_work); | |
a6c9af87 | 1369 | vhost_work_flush(&vs->dev, &vs->vs_event_work); |
f2f0173d AH |
1370 | |
1371 | /* Wait for all reqs issued before the flush to be finished */ | |
1372 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1373 | wait_for_completion(&old_inflight[i]->comp); | |
4f7f46d3 AH |
1374 | } |
1375 | ||
057cbf49 NB |
1376 | /* |
1377 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
1a1ff825 | 1378 | * vhost_scsi_tpg with an active struct vhost_scsi_nexus |
f2b7daf5 AH |
1379 | * |
1380 | * The lock nesting rule is: | |
1a1ff825 | 1381 | * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex |
057cbf49 | 1382 | */ |
683bd967 AH |
1383 | static int |
1384 | vhost_scsi_set_endpoint(struct vhost_scsi *vs, | |
1385 | struct vhost_scsi_target *t) | |
057cbf49 | 1386 | { |
ab8edab1 | 1387 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1388 | struct vhost_scsi_tport *tv_tport; |
1389 | struct vhost_scsi_tpg *tpg; | |
1390 | struct vhost_scsi_tpg **vs_tpg; | |
4f7f46d3 AH |
1391 | struct vhost_virtqueue *vq; |
1392 | int index, ret, i, len; | |
67e18cf9 | 1393 | bool match = false; |
057cbf49 | 1394 | |
1a1ff825 | 1395 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 1396 | mutex_lock(&vs->dev.mutex); |
f2b7daf5 | 1397 | |
057cbf49 NB |
1398 | /* Verify that ring has been setup correctly. */ |
1399 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
1400 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 1401 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
1402 | ret = -EFAULT; |
1403 | goto out; | |
057cbf49 NB |
1404 | } |
1405 | } | |
057cbf49 | 1406 | |
4f7f46d3 AH |
1407 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
1408 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
1409 | if (!vs_tpg) { | |
f2b7daf5 AH |
1410 | ret = -ENOMEM; |
1411 | goto out; | |
4f7f46d3 AH |
1412 | } |
1413 | if (vs->vs_tpg) | |
1414 | memcpy(vs_tpg, vs->vs_tpg, len); | |
1415 | ||
1a1ff825 | 1416 | list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) { |
98718312 AH |
1417 | mutex_lock(&tpg->tv_tpg_mutex); |
1418 | if (!tpg->tpg_nexus) { | |
1419 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1420 | continue; |
1421 | } | |
98718312 AH |
1422 | if (tpg->tv_tpg_vhost_count != 0) { |
1423 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1424 | continue; |
1425 | } | |
98718312 | 1426 | tv_tport = tpg->tport; |
057cbf49 | 1427 | |
67e18cf9 | 1428 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
98718312 | 1429 | if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
4f7f46d3 | 1430 | kfree(vs_tpg); |
98718312 | 1431 | mutex_unlock(&tpg->tv_tpg_mutex); |
f2b7daf5 AH |
1432 | ret = -EEXIST; |
1433 | goto out; | |
101998f6 | 1434 | } |
ab8edab1 NB |
1435 | /* |
1436 | * In order to ensure individual vhost-scsi configfs | |
1437 | * groups cannot be removed while in use by vhost ioctl, | |
1438 | * go ahead and take an explicit se_tpg->tpg_group.cg_item | |
1439 | * dependency now. | |
1440 | */ | |
1441 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1442 | ret = target_depend_item(&se_tpg->tpg_group.cg_item); |
ab8edab1 | 1443 | if (ret) { |
a691ffb4 | 1444 | pr_warn("target_depend_item() failed: %d\n", ret); |
ab8edab1 NB |
1445 | kfree(vs_tpg); |
1446 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1447 | goto out; | |
1448 | } | |
98718312 AH |
1449 | tpg->tv_tpg_vhost_count++; |
1450 | tpg->vhost_scsi = vs; | |
1451 | vs_tpg[tpg->tport_tpgt] = tpg; | |
67e18cf9 | 1452 | match = true; |
057cbf49 | 1453 | } |
98718312 | 1454 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1455 | } |
67e18cf9 AH |
1456 | |
1457 | if (match) { | |
1458 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1459 | sizeof(vs->vs_vhost_wwpn)); | |
4f7f46d3 | 1460 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
3ab2e420 | 1461 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1462 | mutex_lock(&vq->mutex); |
22fa90c7 | 1463 | vq->private_data = vs_tpg; |
80f7d030 | 1464 | vhost_vq_init_access(vq); |
4f7f46d3 AH |
1465 | mutex_unlock(&vq->mutex); |
1466 | } | |
67e18cf9 AH |
1467 | ret = 0; |
1468 | } else { | |
1469 | ret = -EEXIST; | |
1470 | } | |
1471 | ||
4f7f46d3 AH |
1472 | /* |
1473 | * Act as synchronize_rcu to make sure access to | |
1474 | * old vs->vs_tpg is finished. | |
1475 | */ | |
1476 | vhost_scsi_flush(vs); | |
1477 | kfree(vs->vs_tpg); | |
1478 | vs->vs_tpg = vs_tpg; | |
1479 | ||
f2b7daf5 | 1480 | out: |
67e18cf9 | 1481 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1482 | mutex_unlock(&vhost_scsi_mutex); |
67e18cf9 | 1483 | return ret; |
057cbf49 NB |
1484 | } |
1485 | ||
683bd967 AH |
1486 | static int |
1487 | vhost_scsi_clear_endpoint(struct vhost_scsi *vs, | |
1488 | struct vhost_scsi_target *t) | |
057cbf49 | 1489 | { |
ab8edab1 | 1490 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1491 | struct vhost_scsi_tport *tv_tport; |
1492 | struct vhost_scsi_tpg *tpg; | |
4f7f46d3 AH |
1493 | struct vhost_virtqueue *vq; |
1494 | bool match = false; | |
67e18cf9 AH |
1495 | int index, ret, i; |
1496 | u8 target; | |
057cbf49 | 1497 | |
1a1ff825 | 1498 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 NB |
1499 | mutex_lock(&vs->dev.mutex); |
1500 | /* Verify that ring has been setup correctly. */ | |
1501 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1502 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1503 | ret = -EFAULT; |
038e0af4 | 1504 | goto err_dev; |
057cbf49 NB |
1505 | } |
1506 | } | |
4f7f46d3 AH |
1507 | |
1508 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1509 | ret = 0; |
1510 | goto err_dev; | |
4f7f46d3 AH |
1511 | } |
1512 | ||
67e18cf9 AH |
1513 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1514 | target = i; | |
98718312 AH |
1515 | tpg = vs->vs_tpg[target]; |
1516 | if (!tpg) | |
67e18cf9 AH |
1517 | continue; |
1518 | ||
98718312 AH |
1519 | mutex_lock(&tpg->tv_tpg_mutex); |
1520 | tv_tport = tpg->tport; | |
67e18cf9 AH |
1521 | if (!tv_tport) { |
1522 | ret = -ENODEV; | |
038e0af4 | 1523 | goto err_tpg; |
67e18cf9 AH |
1524 | } |
1525 | ||
1526 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
98718312 | 1527 | pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" |
67e18cf9 | 1528 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", |
98718312 | 1529 | tv_tport->tport_name, tpg->tport_tpgt, |
67e18cf9 AH |
1530 | t->vhost_wwpn, t->vhost_tpgt); |
1531 | ret = -EINVAL; | |
038e0af4 | 1532 | goto err_tpg; |
67e18cf9 | 1533 | } |
98718312 AH |
1534 | tpg->tv_tpg_vhost_count--; |
1535 | tpg->vhost_scsi = NULL; | |
67e18cf9 | 1536 | vs->vs_tpg[target] = NULL; |
4f7f46d3 | 1537 | match = true; |
98718312 | 1538 | mutex_unlock(&tpg->tv_tpg_mutex); |
ab8edab1 NB |
1539 | /* |
1540 | * Release se_tpg->tpg_group.cg_item configfs dependency now | |
1541 | * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur. | |
1542 | */ | |
1543 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1544 | target_undepend_item(&se_tpg->tpg_group.cg_item); |
057cbf49 | 1545 | } |
4f7f46d3 AH |
1546 | if (match) { |
1547 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
3ab2e420 | 1548 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1549 | mutex_lock(&vq->mutex); |
22fa90c7 | 1550 | vq->private_data = NULL; |
4f7f46d3 AH |
1551 | mutex_unlock(&vq->mutex); |
1552 | } | |
1553 | } | |
1554 | /* | |
1555 | * Act as synchronize_rcu to make sure access to | |
1556 | * old vs->vs_tpg is finished. | |
1557 | */ | |
1558 | vhost_scsi_flush(vs); | |
1559 | kfree(vs->vs_tpg); | |
1560 | vs->vs_tpg = NULL; | |
a6c9af87 | 1561 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1562 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1563 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 1564 | return 0; |
101998f6 | 1565 | |
038e0af4 | 1566 | err_tpg: |
98718312 | 1567 | mutex_unlock(&tpg->tv_tpg_mutex); |
038e0af4 | 1568 | err_dev: |
101998f6 | 1569 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1570 | mutex_unlock(&vhost_scsi_mutex); |
101998f6 | 1571 | return ret; |
057cbf49 NB |
1572 | } |
1573 | ||
4f7f46d3 AH |
1574 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1575 | { | |
ea16c514 MT |
1576 | struct vhost_virtqueue *vq; |
1577 | int i; | |
1578 | ||
4f7f46d3 AH |
1579 | if (features & ~VHOST_SCSI_FEATURES) |
1580 | return -EOPNOTSUPP; | |
1581 | ||
1582 | mutex_lock(&vs->dev.mutex); | |
1583 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1584 | !vhost_log_access_ok(&vs->dev)) { | |
1585 | mutex_unlock(&vs->dev.mutex); | |
1586 | return -EFAULT; | |
1587 | } | |
ea16c514 MT |
1588 | |
1589 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
1590 | vq = &vs->vqs[i].vq; | |
1591 | mutex_lock(&vq->mutex); | |
1592 | vq->acked_features = features; | |
1593 | mutex_unlock(&vq->mutex); | |
1594 | } | |
4f7f46d3 AH |
1595 | mutex_unlock(&vs->dev.mutex); |
1596 | return 0; | |
1597 | } | |
1598 | ||
057cbf49 NB |
1599 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1600 | { | |
c7289312 | 1601 | struct vhost_scsi *vs; |
3ab2e420 | 1602 | struct vhost_virtqueue **vqs; |
595cb754 | 1603 | int r = -ENOMEM, i; |
057cbf49 | 1604 | |
dcda9b04 | 1605 | vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_RETRY_MAYFAIL); |
595cb754 MT |
1606 | if (!vs) { |
1607 | vs = vzalloc(sizeof(*vs)); | |
1608 | if (!vs) | |
1609 | goto err_vs; | |
1610 | } | |
057cbf49 | 1611 | |
6da2ec56 | 1612 | vqs = kmalloc_array(VHOST_SCSI_MAX_VQ, sizeof(*vqs), GFP_KERNEL); |
595cb754 MT |
1613 | if (!vqs) |
1614 | goto err_vqs; | |
3ab2e420 | 1615 | |
c7289312 | 1616 | vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); |
1a1ff825 | 1617 | vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work); |
a6c9af87 | 1618 | |
c7289312 AH |
1619 | vs->vs_events_nr = 0; |
1620 | vs->vs_events_missed = false; | |
057cbf49 | 1621 | |
c7289312 AH |
1622 | vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; |
1623 | vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1624 | vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1625 | vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
3ab2e420 | 1626 | for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { |
c7289312 AH |
1627 | vqs[i] = &vs->vqs[i].vq; |
1628 | vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
3ab2e420 | 1629 | } |
e82b9b07 JW |
1630 | vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ, UIO_MAXIOV, |
1631 | VHOST_SCSI_WEIGHT, 0); | |
f2f0173d | 1632 | |
1a1ff825 | 1633 | vhost_scsi_init_inflight(vs, NULL); |
f2f0173d | 1634 | |
c7289312 | 1635 | f->private_data = vs; |
057cbf49 | 1636 | return 0; |
595cb754 | 1637 | |
595cb754 | 1638 | err_vqs: |
68404441 | 1639 | kvfree(vs); |
595cb754 MT |
1640 | err_vs: |
1641 | return r; | |
057cbf49 NB |
1642 | } |
1643 | ||
1644 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1645 | { | |
c7289312 | 1646 | struct vhost_scsi *vs = f->private_data; |
67e18cf9 | 1647 | struct vhost_scsi_target t; |
057cbf49 | 1648 | |
c7289312 AH |
1649 | mutex_lock(&vs->dev.mutex); |
1650 | memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1651 | mutex_unlock(&vs->dev.mutex); | |
1652 | vhost_scsi_clear_endpoint(vs, &t); | |
1653 | vhost_dev_stop(&vs->dev); | |
f6f93f75 | 1654 | vhost_dev_cleanup(&vs->dev); |
a6c9af87 | 1655 | /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
c7289312 AH |
1656 | vhost_scsi_flush(vs); |
1657 | kfree(vs->dev.vqs); | |
68404441 | 1658 | kvfree(vs); |
057cbf49 NB |
1659 | return 0; |
1660 | } | |
1661 | ||
683bd967 AH |
1662 | static long |
1663 | vhost_scsi_ioctl(struct file *f, | |
1664 | unsigned int ioctl, | |
1665 | unsigned long arg) | |
057cbf49 NB |
1666 | { |
1667 | struct vhost_scsi *vs = f->private_data; | |
1668 | struct vhost_scsi_target backend; | |
1669 | void __user *argp = (void __user *)arg; | |
1670 | u64 __user *featurep = argp; | |
11c63418 AH |
1671 | u32 __user *eventsp = argp; |
1672 | u32 events_missed; | |
057cbf49 | 1673 | u64 features; |
101998f6 | 1674 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1675 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1676 | |
1677 | switch (ioctl) { | |
1678 | case VHOST_SCSI_SET_ENDPOINT: | |
1679 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1680 | return -EFAULT; | |
6de7145c MT |
1681 | if (backend.reserved != 0) |
1682 | return -EOPNOTSUPP; | |
057cbf49 NB |
1683 | |
1684 | return vhost_scsi_set_endpoint(vs, &backend); | |
1685 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1686 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1687 | return -EFAULT; | |
6de7145c MT |
1688 | if (backend.reserved != 0) |
1689 | return -EOPNOTSUPP; | |
057cbf49 NB |
1690 | |
1691 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1692 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1693 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1694 | return -EFAULT; |
1695 | return 0; | |
11c63418 AH |
1696 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1697 | if (get_user(events_missed, eventsp)) | |
1698 | return -EFAULT; | |
1699 | mutex_lock(&vq->mutex); | |
1700 | vs->vs_events_missed = events_missed; | |
1701 | mutex_unlock(&vq->mutex); | |
1702 | return 0; | |
1703 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1704 | mutex_lock(&vq->mutex); | |
1705 | events_missed = vs->vs_events_missed; | |
1706 | mutex_unlock(&vq->mutex); | |
1707 | if (put_user(events_missed, eventsp)) | |
1708 | return -EFAULT; | |
1709 | return 0; | |
057cbf49 | 1710 | case VHOST_GET_FEATURES: |
5dade710 | 1711 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1712 | if (copy_to_user(featurep, &features, sizeof features)) |
1713 | return -EFAULT; | |
1714 | return 0; | |
1715 | case VHOST_SET_FEATURES: | |
1716 | if (copy_from_user(&features, featurep, sizeof features)) | |
1717 | return -EFAULT; | |
1718 | return vhost_scsi_set_features(vs, features); | |
1719 | default: | |
1720 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1721 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1722 | /* TODO: flush backend after dev ioctl. */ | |
1723 | if (r == -ENOIOCTLCMD) | |
1724 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1725 | mutex_unlock(&vs->dev.mutex); |
1726 | return r; | |
1727 | } | |
1728 | } | |
1729 | ||
101998f6 NB |
1730 | #ifdef CONFIG_COMPAT |
1731 | static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, | |
1732 | unsigned long arg) | |
1733 | { | |
1734 | return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1735 | } | |
1736 | #endif | |
1737 | ||
057cbf49 NB |
1738 | static const struct file_operations vhost_scsi_fops = { |
1739 | .owner = THIS_MODULE, | |
1740 | .release = vhost_scsi_release, | |
1741 | .unlocked_ioctl = vhost_scsi_ioctl, | |
101998f6 NB |
1742 | #ifdef CONFIG_COMPAT |
1743 | .compat_ioctl = vhost_scsi_compat_ioctl, | |
1744 | #endif | |
057cbf49 NB |
1745 | .open = vhost_scsi_open, |
1746 | .llseek = noop_llseek, | |
1747 | }; | |
1748 | ||
1749 | static struct miscdevice vhost_scsi_misc = { | |
1750 | MISC_DYNAMIC_MINOR, | |
1751 | "vhost-scsi", | |
1752 | &vhost_scsi_fops, | |
1753 | }; | |
1754 | ||
1755 | static int __init vhost_scsi_register(void) | |
1756 | { | |
1757 | return misc_register(&vhost_scsi_misc); | |
1758 | } | |
1759 | ||
f368ed60 | 1760 | static void vhost_scsi_deregister(void) |
057cbf49 | 1761 | { |
f368ed60 | 1762 | misc_deregister(&vhost_scsi_misc); |
057cbf49 NB |
1763 | } |
1764 | ||
1a1ff825 | 1765 | static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport) |
057cbf49 NB |
1766 | { |
1767 | switch (tport->tport_proto_id) { | |
1768 | case SCSI_PROTOCOL_SAS: | |
1769 | return "SAS"; | |
1770 | case SCSI_PROTOCOL_FCP: | |
1771 | return "FCP"; | |
1772 | case SCSI_PROTOCOL_ISCSI: | |
1773 | return "iSCSI"; | |
1774 | default: | |
1775 | break; | |
1776 | } | |
1777 | ||
1778 | return "Unknown"; | |
1779 | } | |
1780 | ||
683bd967 | 1781 | static void |
1a1ff825 | 1782 | vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg, |
683bd967 | 1783 | struct se_lun *lun, bool plug) |
a6c9af87 AH |
1784 | { |
1785 | ||
1786 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1787 | struct vhost_virtqueue *vq; | |
1788 | u32 reason; | |
1789 | ||
1790 | if (!vs) | |
1791 | return; | |
1792 | ||
1793 | mutex_lock(&vs->dev.mutex); | |
a6c9af87 AH |
1794 | |
1795 | if (plug) | |
1796 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1797 | else | |
1798 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1799 | ||
3ab2e420 | 1800 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 | 1801 | mutex_lock(&vq->mutex); |
ea16c514 | 1802 | if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG)) |
1a1ff825 | 1803 | vhost_scsi_send_evt(vs, tpg, lun, |
ea16c514 | 1804 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); |
a6c9af87 AH |
1805 | mutex_unlock(&vq->mutex); |
1806 | mutex_unlock(&vs->dev.mutex); | |
1807 | } | |
1808 | ||
1a1ff825 | 1809 | static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1810 | { |
1a1ff825 | 1811 | vhost_scsi_do_plug(tpg, lun, true); |
a6c9af87 AH |
1812 | } |
1813 | ||
1a1ff825 | 1814 | static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1815 | { |
1a1ff825 | 1816 | vhost_scsi_do_plug(tpg, lun, false); |
a6c9af87 AH |
1817 | } |
1818 | ||
1a1ff825 | 1819 | static int vhost_scsi_port_link(struct se_portal_group *se_tpg, |
683bd967 | 1820 | struct se_lun *lun) |
057cbf49 | 1821 | { |
1a1ff825 NB |
1822 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1823 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1824 | |
1a1ff825 | 1825 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1826 | |
98718312 AH |
1827 | mutex_lock(&tpg->tv_tpg_mutex); |
1828 | tpg->tv_tpg_port_count++; | |
1829 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 | 1830 | |
1a1ff825 | 1831 | vhost_scsi_hotplug(tpg, lun); |
a6c9af87 | 1832 | |
1a1ff825 | 1833 | mutex_unlock(&vhost_scsi_mutex); |
a6c9af87 | 1834 | |
057cbf49 NB |
1835 | return 0; |
1836 | } | |
1837 | ||
1a1ff825 | 1838 | static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg, |
683bd967 | 1839 | struct se_lun *lun) |
057cbf49 | 1840 | { |
1a1ff825 NB |
1841 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1842 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1843 | |
1a1ff825 | 1844 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1845 | |
98718312 AH |
1846 | mutex_lock(&tpg->tv_tpg_mutex); |
1847 | tpg->tv_tpg_port_count--; | |
1848 | mutex_unlock(&tpg->tv_tpg_mutex); | |
a6c9af87 | 1849 | |
1a1ff825 | 1850 | vhost_scsi_hotunplug(tpg, lun); |
a6c9af87 | 1851 | |
1a1ff825 | 1852 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 NB |
1853 | } |
1854 | ||
65ea7898 | 1855 | static void vhost_scsi_free_cmd_map_res(struct se_session *se_sess) |
3aee26b4 | 1856 | { |
1a1ff825 | 1857 | struct vhost_scsi_cmd *tv_cmd; |
3aee26b4 NB |
1858 | unsigned int i; |
1859 | ||
1860 | if (!se_sess->sess_cmd_map) | |
1861 | return; | |
1862 | ||
1a1ff825 NB |
1863 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1864 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 NB |
1865 | |
1866 | kfree(tv_cmd->tvc_sgl); | |
b1935f68 | 1867 | kfree(tv_cmd->tvc_prot_sgl); |
3aee26b4 NB |
1868 | kfree(tv_cmd->tvc_upages); |
1869 | } | |
1870 | } | |
1871 | ||
2eafd729 CH |
1872 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store( |
1873 | struct config_item *item, const char *page, size_t count) | |
b1d75fe5 | 1874 | { |
2eafd729 | 1875 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
b1d75fe5 NB |
1876 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1877 | struct vhost_scsi_tpg, se_tpg); | |
1878 | unsigned long val; | |
1879 | int ret = kstrtoul(page, 0, &val); | |
1880 | ||
1881 | if (ret) { | |
1882 | pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); | |
1883 | return ret; | |
1884 | } | |
1885 | if (val != 0 && val != 1 && val != 3) { | |
1886 | pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val); | |
1887 | return -EINVAL; | |
1888 | } | |
1889 | tpg->tv_fabric_prot_type = val; | |
1890 | ||
1891 | return count; | |
1892 | } | |
1893 | ||
2eafd729 CH |
1894 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show( |
1895 | struct config_item *item, char *page) | |
b1d75fe5 | 1896 | { |
2eafd729 | 1897 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
b1d75fe5 NB |
1898 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1899 | struct vhost_scsi_tpg, se_tpg); | |
1900 | ||
1901 | return sprintf(page, "%d\n", tpg->tv_fabric_prot_type); | |
1902 | } | |
2eafd729 CH |
1903 | |
1904 | CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type); | |
b1d75fe5 NB |
1905 | |
1906 | static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = { | |
2eafd729 | 1907 | &vhost_scsi_tpg_attrib_attr_fabric_prot_type, |
b1d75fe5 NB |
1908 | NULL, |
1909 | }; | |
1910 | ||
65ea7898 NB |
1911 | static int vhost_scsi_nexus_cb(struct se_portal_group *se_tpg, |
1912 | struct se_session *se_sess, void *p) | |
057cbf49 | 1913 | { |
1a1ff825 | 1914 | struct vhost_scsi_cmd *tv_cmd; |
3aee26b4 | 1915 | unsigned int i; |
057cbf49 | 1916 | |
1a1ff825 NB |
1917 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1918 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 | 1919 | |
6396bb22 KC |
1920 | tv_cmd->tvc_sgl = kcalloc(VHOST_SCSI_PREALLOC_SGLS, |
1921 | sizeof(struct scatterlist), | |
1922 | GFP_KERNEL); | |
3aee26b4 | 1923 | if (!tv_cmd->tvc_sgl) { |
3aee26b4 NB |
1924 | pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); |
1925 | goto out; | |
1926 | } | |
1927 | ||
6396bb22 KC |
1928 | tv_cmd->tvc_upages = kcalloc(VHOST_SCSI_PREALLOC_UPAGES, |
1929 | sizeof(struct page *), | |
1930 | GFP_KERNEL); | |
3aee26b4 | 1931 | if (!tv_cmd->tvc_upages) { |
3aee26b4 NB |
1932 | pr_err("Unable to allocate tv_cmd->tvc_upages\n"); |
1933 | goto out; | |
1934 | } | |
b1935f68 | 1935 | |
6396bb22 KC |
1936 | tv_cmd->tvc_prot_sgl = kcalloc(VHOST_SCSI_PREALLOC_PROT_SGLS, |
1937 | sizeof(struct scatterlist), | |
1938 | GFP_KERNEL); | |
b1935f68 | 1939 | if (!tv_cmd->tvc_prot_sgl) { |
b1935f68 NB |
1940 | pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); |
1941 | goto out; | |
1942 | } | |
3aee26b4 | 1943 | } |
65ea7898 NB |
1944 | return 0; |
1945 | out: | |
1946 | vhost_scsi_free_cmd_map_res(se_sess); | |
1947 | return -ENOMEM; | |
1948 | } | |
1949 | ||
1950 | static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg, | |
1951 | const char *name) | |
1952 | { | |
65ea7898 NB |
1953 | struct vhost_scsi_nexus *tv_nexus; |
1954 | ||
1955 | mutex_lock(&tpg->tv_tpg_mutex); | |
1956 | if (tpg->tpg_nexus) { | |
1957 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1958 | pr_debug("tpg->tpg_nexus already exists\n"); | |
1959 | return -EEXIST; | |
1960 | } | |
65ea7898 | 1961 | |
473f0b15 | 1962 | tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); |
65ea7898 NB |
1963 | if (!tv_nexus) { |
1964 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1965 | pr_err("Unable to allocate struct vhost_scsi_nexus\n"); | |
1966 | return -ENOMEM; | |
1967 | } | |
057cbf49 NB |
1968 | /* |
1969 | * Since we are running in 'demo mode' this call with generate a | |
1a1ff825 | 1970 | * struct se_node_acl for the vhost_scsi struct se_portal_group with |
057cbf49 NB |
1971 | * the SCSI Initiator port name of the passed configfs group 'name'. |
1972 | */ | |
fa834287 | 1973 | tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, |
65ea7898 NB |
1974 | VHOST_SCSI_DEFAULT_TAGS, |
1975 | sizeof(struct vhost_scsi_cmd), | |
1976 | TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS, | |
1977 | (unsigned char *)name, tv_nexus, | |
1978 | vhost_scsi_nexus_cb); | |
1979 | if (IS_ERR(tv_nexus->tvn_se_sess)) { | |
98718312 | 1980 | mutex_unlock(&tpg->tv_tpg_mutex); |
65ea7898 NB |
1981 | kfree(tv_nexus); |
1982 | return -ENOMEM; | |
057cbf49 | 1983 | } |
98718312 | 1984 | tpg->tpg_nexus = tv_nexus; |
057cbf49 | 1985 | |
98718312 | 1986 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1987 | return 0; |
1988 | } | |
1989 | ||
1a1ff825 | 1990 | static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg) |
057cbf49 NB |
1991 | { |
1992 | struct se_session *se_sess; | |
1a1ff825 | 1993 | struct vhost_scsi_nexus *tv_nexus; |
057cbf49 NB |
1994 | |
1995 | mutex_lock(&tpg->tv_tpg_mutex); | |
1996 | tv_nexus = tpg->tpg_nexus; | |
1997 | if (!tv_nexus) { | |
1998 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1999 | return -ENODEV; | |
2000 | } | |
2001 | ||
2002 | se_sess = tv_nexus->tvn_se_sess; | |
2003 | if (!se_sess) { | |
2004 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2005 | return -ENODEV; | |
2006 | } | |
2007 | ||
101998f6 | 2008 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 2009 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 2010 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 2011 | " active TPG port count: %d\n", |
101998f6 NB |
2012 | tpg->tv_tpg_port_count); |
2013 | return -EBUSY; | |
057cbf49 NB |
2014 | } |
2015 | ||
101998f6 | 2016 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 2017 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 2018 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 2019 | " active TPG vhost count: %d\n", |
101998f6 NB |
2020 | tpg->tv_tpg_vhost_count); |
2021 | return -EBUSY; | |
057cbf49 NB |
2022 | } |
2023 | ||
101998f6 | 2024 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
1a1ff825 | 2025 | " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport), |
057cbf49 | 2026 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
3aee26b4 | 2027 | |
65ea7898 | 2028 | vhost_scsi_free_cmd_map_res(se_sess); |
057cbf49 | 2029 | /* |
101998f6 | 2030 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 | 2031 | */ |
25b88550 | 2032 | target_remove_session(se_sess); |
057cbf49 NB |
2033 | tpg->tpg_nexus = NULL; |
2034 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2035 | ||
2036 | kfree(tv_nexus); | |
2037 | return 0; | |
2038 | } | |
2039 | ||
2eafd729 | 2040 | static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page) |
057cbf49 | 2041 | { |
2eafd729 | 2042 | struct se_portal_group *se_tpg = to_tpg(item); |
1a1ff825 NB |
2043 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2044 | struct vhost_scsi_tpg, se_tpg); | |
2045 | struct vhost_scsi_nexus *tv_nexus; | |
057cbf49 NB |
2046 | ssize_t ret; |
2047 | ||
98718312 AH |
2048 | mutex_lock(&tpg->tv_tpg_mutex); |
2049 | tv_nexus = tpg->tpg_nexus; | |
057cbf49 | 2050 | if (!tv_nexus) { |
98718312 | 2051 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2052 | return -ENODEV; |
2053 | } | |
2054 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
2055 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
98718312 | 2056 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2057 | |
2058 | return ret; | |
2059 | } | |
2060 | ||
2eafd729 CH |
2061 | static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item, |
2062 | const char *page, size_t count) | |
057cbf49 | 2063 | { |
2eafd729 | 2064 | struct se_portal_group *se_tpg = to_tpg(item); |
1a1ff825 NB |
2065 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2066 | struct vhost_scsi_tpg, se_tpg); | |
2067 | struct vhost_scsi_tport *tport_wwn = tpg->tport; | |
2068 | unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr; | |
057cbf49 NB |
2069 | int ret; |
2070 | /* | |
2071 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
2072 | */ | |
2073 | if (!strncmp(page, "NULL", 4)) { | |
1a1ff825 | 2074 | ret = vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
2075 | return (!ret) ? count : ret; |
2076 | } | |
2077 | /* | |
2078 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1a1ff825 NB |
2079 | * the fabric protocol_id set in vhost_scsi_make_tport(), and call |
2080 | * vhost_scsi_make_nexus(). | |
057cbf49 | 2081 | */ |
1a1ff825 | 2082 | if (strlen(page) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2083 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
1a1ff825 | 2084 | " max: %d\n", page, VHOST_SCSI_NAMELEN); |
057cbf49 NB |
2085 | return -EINVAL; |
2086 | } | |
1a1ff825 | 2087 | snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page); |
057cbf49 NB |
2088 | |
2089 | ptr = strstr(i_port, "naa."); | |
2090 | if (ptr) { | |
2091 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
2092 | pr_err("Passed SAS Initiator Port %s does not" | |
2093 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2094 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2095 | return -EINVAL; |
2096 | } | |
2097 | port_ptr = &i_port[0]; | |
2098 | goto check_newline; | |
2099 | } | |
2100 | ptr = strstr(i_port, "fc."); | |
2101 | if (ptr) { | |
2102 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
2103 | pr_err("Passed FCP Initiator Port %s does not" | |
2104 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2105 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2106 | return -EINVAL; |
2107 | } | |
2108 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
2109 | goto check_newline; | |
2110 | } | |
2111 | ptr = strstr(i_port, "iqn."); | |
2112 | if (ptr) { | |
2113 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
2114 | pr_err("Passed iSCSI Initiator Port %s does not" | |
2115 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2116 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2117 | return -EINVAL; |
2118 | } | |
2119 | port_ptr = &i_port[0]; | |
2120 | goto check_newline; | |
2121 | } | |
2122 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
2123 | " %s\n", i_port); | |
2124 | return -EINVAL; | |
2125 | /* | |
2126 | * Clear any trailing newline for the NAA WWN | |
2127 | */ | |
2128 | check_newline: | |
2129 | if (i_port[strlen(i_port)-1] == '\n') | |
2130 | i_port[strlen(i_port)-1] = '\0'; | |
2131 | ||
1a1ff825 | 2132 | ret = vhost_scsi_make_nexus(tpg, port_ptr); |
057cbf49 NB |
2133 | if (ret < 0) |
2134 | return ret; | |
2135 | ||
2136 | return count; | |
2137 | } | |
2138 | ||
2eafd729 | 2139 | CONFIGFS_ATTR(vhost_scsi_tpg_, nexus); |
057cbf49 | 2140 | |
1a1ff825 | 2141 | static struct configfs_attribute *vhost_scsi_tpg_attrs[] = { |
2eafd729 | 2142 | &vhost_scsi_tpg_attr_nexus, |
057cbf49 NB |
2143 | NULL, |
2144 | }; | |
2145 | ||
683bd967 | 2146 | static struct se_portal_group * |
aa090eab | 2147 | vhost_scsi_make_tpg(struct se_wwn *wwn, const char *name) |
057cbf49 | 2148 | { |
1a1ff825 NB |
2149 | struct vhost_scsi_tport *tport = container_of(wwn, |
2150 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 | 2151 | |
1a1ff825 | 2152 | struct vhost_scsi_tpg *tpg; |
59c816c1 | 2153 | u16 tpgt; |
057cbf49 NB |
2154 | int ret; |
2155 | ||
2156 | if (strstr(name, "tpgt_") != name) | |
2157 | return ERR_PTR(-EINVAL); | |
59c816c1 | 2158 | if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET) |
057cbf49 NB |
2159 | return ERR_PTR(-EINVAL); |
2160 | ||
473f0b15 | 2161 | tpg = kzalloc(sizeof(*tpg), GFP_KERNEL); |
057cbf49 | 2162 | if (!tpg) { |
1a1ff825 | 2163 | pr_err("Unable to allocate struct vhost_scsi_tpg"); |
057cbf49 NB |
2164 | return ERR_PTR(-ENOMEM); |
2165 | } | |
2166 | mutex_init(&tpg->tv_tpg_mutex); | |
2167 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
2168 | tpg->tport = tport; | |
2169 | tpg->tport_tpgt = tpgt; | |
2170 | ||
bc0c94b1 | 2171 | ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id); |
057cbf49 NB |
2172 | if (ret < 0) { |
2173 | kfree(tpg); | |
2174 | return NULL; | |
2175 | } | |
1a1ff825 NB |
2176 | mutex_lock(&vhost_scsi_mutex); |
2177 | list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list); | |
2178 | mutex_unlock(&vhost_scsi_mutex); | |
057cbf49 NB |
2179 | |
2180 | return &tpg->se_tpg; | |
2181 | } | |
2182 | ||
1a1ff825 | 2183 | static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg) |
057cbf49 | 2184 | { |
1a1ff825 NB |
2185 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2186 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 2187 | |
1a1ff825 | 2188 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 2189 | list_del(&tpg->tv_tpg_list); |
1a1ff825 | 2190 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 2191 | /* |
101998f6 | 2192 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 | 2193 | */ |
1a1ff825 | 2194 | vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
2195 | /* |
2196 | * Deregister the se_tpg from TCM.. | |
2197 | */ | |
2198 | core_tpg_deregister(se_tpg); | |
2199 | kfree(tpg); | |
2200 | } | |
2201 | ||
683bd967 | 2202 | static struct se_wwn * |
1a1ff825 | 2203 | vhost_scsi_make_tport(struct target_fabric_configfs *tf, |
683bd967 AH |
2204 | struct config_group *group, |
2205 | const char *name) | |
057cbf49 | 2206 | { |
1a1ff825 | 2207 | struct vhost_scsi_tport *tport; |
057cbf49 NB |
2208 | char *ptr; |
2209 | u64 wwpn = 0; | |
2210 | int off = 0; | |
2211 | ||
1a1ff825 | 2212 | /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0) |
057cbf49 NB |
2213 | return ERR_PTR(-EINVAL); */ |
2214 | ||
473f0b15 | 2215 | tport = kzalloc(sizeof(*tport), GFP_KERNEL); |
057cbf49 | 2216 | if (!tport) { |
1a1ff825 | 2217 | pr_err("Unable to allocate struct vhost_scsi_tport"); |
057cbf49 NB |
2218 | return ERR_PTR(-ENOMEM); |
2219 | } | |
2220 | tport->tport_wwpn = wwpn; | |
2221 | /* | |
2222 | * Determine the emulated Protocol Identifier and Target Port Name | |
2223 | * based on the incoming configfs directory name. | |
2224 | */ | |
2225 | ptr = strstr(name, "naa."); | |
2226 | if (ptr) { | |
2227 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
2228 | goto check_len; | |
2229 | } | |
2230 | ptr = strstr(name, "fc."); | |
2231 | if (ptr) { | |
2232 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
2233 | off = 3; /* Skip over "fc." */ | |
2234 | goto check_len; | |
2235 | } | |
2236 | ptr = strstr(name, "iqn."); | |
2237 | if (ptr) { | |
2238 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
2239 | goto check_len; | |
2240 | } | |
2241 | ||
2242 | pr_err("Unable to locate prefix for emulated Target Port:" | |
2243 | " %s\n", name); | |
2244 | kfree(tport); | |
2245 | return ERR_PTR(-EINVAL); | |
2246 | ||
2247 | check_len: | |
1a1ff825 | 2248 | if (strlen(name) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2249 | pr_err("Emulated %s Address: %s, exceeds" |
1a1ff825 NB |
2250 | " max: %d\n", name, vhost_scsi_dump_proto_id(tport), |
2251 | VHOST_SCSI_NAMELEN); | |
057cbf49 NB |
2252 | kfree(tport); |
2253 | return ERR_PTR(-EINVAL); | |
2254 | } | |
1a1ff825 | 2255 | snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]); |
057cbf49 NB |
2256 | |
2257 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
1a1ff825 | 2258 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name); |
057cbf49 NB |
2259 | |
2260 | return &tport->tport_wwn; | |
2261 | } | |
2262 | ||
1a1ff825 | 2263 | static void vhost_scsi_drop_tport(struct se_wwn *wwn) |
057cbf49 | 2264 | { |
1a1ff825 NB |
2265 | struct vhost_scsi_tport *tport = container_of(wwn, |
2266 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 NB |
2267 | |
2268 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
1a1ff825 | 2269 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), |
057cbf49 NB |
2270 | tport->tport_name); |
2271 | ||
2272 | kfree(tport); | |
2273 | } | |
2274 | ||
683bd967 | 2275 | static ssize_t |
2eafd729 | 2276 | vhost_scsi_wwn_version_show(struct config_item *item, char *page) |
057cbf49 NB |
2277 | { |
2278 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" | |
1a1ff825 | 2279 | "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 NB |
2280 | utsname()->machine); |
2281 | } | |
2282 | ||
2eafd729 | 2283 | CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version); |
057cbf49 | 2284 | |
1a1ff825 | 2285 | static struct configfs_attribute *vhost_scsi_wwn_attrs[] = { |
2eafd729 | 2286 | &vhost_scsi_wwn_attr_version, |
057cbf49 NB |
2287 | NULL, |
2288 | }; | |
2289 | ||
1d822a40 | 2290 | static const struct target_core_fabric_ops vhost_scsi_ops = { |
9ac8928e | 2291 | .module = THIS_MODULE, |
30c7ca93 | 2292 | .fabric_name = "vhost", |
1a1ff825 NB |
2293 | .tpg_get_wwn = vhost_scsi_get_fabric_wwn, |
2294 | .tpg_get_tag = vhost_scsi_get_tpgt, | |
1a1ff825 NB |
2295 | .tpg_check_demo_mode = vhost_scsi_check_true, |
2296 | .tpg_check_demo_mode_cache = vhost_scsi_check_true, | |
2297 | .tpg_check_demo_mode_write_protect = vhost_scsi_check_false, | |
2298 | .tpg_check_prod_mode_write_protect = vhost_scsi_check_false, | |
b1d75fe5 | 2299 | .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only, |
1a1ff825 NB |
2300 | .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index, |
2301 | .release_cmd = vhost_scsi_release_cmd, | |
084ed45b | 2302 | .check_stop_free = vhost_scsi_check_stop_free, |
1a1ff825 | 2303 | .sess_get_index = vhost_scsi_sess_get_index, |
057cbf49 | 2304 | .sess_get_initiator_sid = NULL, |
1a1ff825 | 2305 | .write_pending = vhost_scsi_write_pending, |
1a1ff825 | 2306 | .set_default_node_attributes = vhost_scsi_set_default_node_attrs, |
1a1ff825 NB |
2307 | .get_cmd_state = vhost_scsi_get_cmd_state, |
2308 | .queue_data_in = vhost_scsi_queue_data_in, | |
2309 | .queue_status = vhost_scsi_queue_status, | |
2310 | .queue_tm_rsp = vhost_scsi_queue_tm_rsp, | |
2311 | .aborted_task = vhost_scsi_aborted_task, | |
057cbf49 NB |
2312 | /* |
2313 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
2314 | */ | |
1a1ff825 NB |
2315 | .fabric_make_wwn = vhost_scsi_make_tport, |
2316 | .fabric_drop_wwn = vhost_scsi_drop_tport, | |
2317 | .fabric_make_tpg = vhost_scsi_make_tpg, | |
2318 | .fabric_drop_tpg = vhost_scsi_drop_tpg, | |
2319 | .fabric_post_link = vhost_scsi_port_link, | |
2320 | .fabric_pre_unlink = vhost_scsi_port_unlink, | |
9ac8928e CH |
2321 | |
2322 | .tfc_wwn_attrs = vhost_scsi_wwn_attrs, | |
2323 | .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs, | |
2324 | .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs, | |
057cbf49 NB |
2325 | }; |
2326 | ||
9ac8928e | 2327 | static int __init vhost_scsi_init(void) |
057cbf49 | 2328 | { |
9ac8928e | 2329 | int ret = -ENOMEM; |
057cbf49 | 2330 | |
9ac8928e | 2331 | pr_debug("TCM_VHOST fabric module %s on %s/%s" |
1a1ff825 | 2332 | " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 | 2333 | utsname()->machine); |
057cbf49 | 2334 | |
101998f6 NB |
2335 | /* |
2336 | * Use our own dedicated workqueue for submitting I/O into | |
2337 | * target core to avoid contention within system_wq. | |
2338 | */ | |
1a1ff825 NB |
2339 | vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0); |
2340 | if (!vhost_scsi_workqueue) | |
057cbf49 NB |
2341 | goto out; |
2342 | ||
2343 | ret = vhost_scsi_register(); | |
2344 | if (ret < 0) | |
2345 | goto out_destroy_workqueue; | |
2346 | ||
9ac8928e | 2347 | ret = target_register_template(&vhost_scsi_ops); |
057cbf49 NB |
2348 | if (ret < 0) |
2349 | goto out_vhost_scsi_deregister; | |
2350 | ||
2351 | return 0; | |
2352 | ||
2353 | out_vhost_scsi_deregister: | |
2354 | vhost_scsi_deregister(); | |
2355 | out_destroy_workqueue: | |
1a1ff825 | 2356 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2357 | out: |
2358 | return ret; | |
2359 | }; | |
2360 | ||
1a1ff825 | 2361 | static void vhost_scsi_exit(void) |
057cbf49 | 2362 | { |
9ac8928e | 2363 | target_unregister_template(&vhost_scsi_ops); |
057cbf49 | 2364 | vhost_scsi_deregister(); |
1a1ff825 | 2365 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2366 | }; |
2367 | ||
181c04a3 MT |
2368 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
2369 | MODULE_ALIAS("tcm_vhost"); | |
057cbf49 | 2370 | MODULE_LICENSE("GPL"); |
1a1ff825 NB |
2371 | module_init(vhost_scsi_init); |
2372 | module_exit(vhost_scsi_exit); |