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Commit | Line | Data |
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057cbf49 NB |
1 | /******************************************************************************* |
2 | * Vhost kernel TCM fabric driver for virtio SCSI initiators | |
3 | * | |
4c76251e | 4 | * (C) Copyright 2010-2013 Datera, Inc. |
057cbf49 NB |
5 | * (C) Copyright 2010-2012 IBM Corp. |
6 | * | |
7 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. | |
8 | * | |
4c76251e | 9 | * Authors: Nicholas A. Bellinger <nab@daterainc.com> |
057cbf49 NB |
10 | * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | ****************************************************************************/ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/moduleparam.h> | |
26 | #include <generated/utsrelease.h> | |
27 | #include <linux/utsname.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/kthread.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/configfs.h> | |
34 | #include <linux/ctype.h> | |
35 | #include <linux/compat.h> | |
36 | #include <linux/eventfd.h> | |
057cbf49 | 37 | #include <linux/fs.h> |
5538d294 | 38 | #include <linux/vmalloc.h> |
057cbf49 NB |
39 | #include <linux/miscdevice.h> |
40 | #include <asm/unaligned.h> | |
ba929992 BVA |
41 | #include <scsi/scsi_common.h> |
42 | #include <scsi/scsi_proto.h> | |
057cbf49 NB |
43 | #include <target/target_core_base.h> |
44 | #include <target/target_core_fabric.h> | |
057cbf49 | 45 | #include <linux/vhost.h> |
057cbf49 | 46 | #include <linux/virtio_scsi.h> |
9d6064a3 | 47 | #include <linux/llist.h> |
1b7f390e | 48 | #include <linux/bitmap.h> |
4824d3bf | 49 | #include <linux/percpu_ida.h> |
057cbf49 | 50 | |
057cbf49 | 51 | #include "vhost.h" |
5012a3a3 | 52 | |
1a1ff825 NB |
53 | #define VHOST_SCSI_VERSION "v0.1" |
54 | #define VHOST_SCSI_NAMELEN 256 | |
55 | #define VHOST_SCSI_MAX_CDB_SIZE 32 | |
56 | #define VHOST_SCSI_DEFAULT_TAGS 256 | |
57 | #define VHOST_SCSI_PREALLOC_SGLS 2048 | |
58 | #define VHOST_SCSI_PREALLOC_UPAGES 2048 | |
59 | #define VHOST_SCSI_PREALLOC_PROT_SGLS 512 | |
5012a3a3 MT |
60 | |
61 | struct vhost_scsi_inflight { | |
62 | /* Wait for the flush operation to finish */ | |
63 | struct completion comp; | |
64 | /* Refcount for the inflight reqs */ | |
65 | struct kref kref; | |
66 | }; | |
67 | ||
1a1ff825 | 68 | struct vhost_scsi_cmd { |
5012a3a3 MT |
69 | /* Descriptor from vhost_get_vq_desc() for virt_queue segment */ |
70 | int tvc_vq_desc; | |
71 | /* virtio-scsi initiator task attribute */ | |
72 | int tvc_task_attr; | |
79c14141 NB |
73 | /* virtio-scsi response incoming iovecs */ |
74 | int tvc_in_iovs; | |
5012a3a3 MT |
75 | /* virtio-scsi initiator data direction */ |
76 | enum dma_data_direction tvc_data_direction; | |
77 | /* Expected data transfer length from virtio-scsi header */ | |
78 | u32 tvc_exp_data_len; | |
79 | /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */ | |
80 | u64 tvc_tag; | |
81 | /* The number of scatterlists associated with this cmd */ | |
82 | u32 tvc_sgl_count; | |
e31885dd | 83 | u32 tvc_prot_sgl_count; |
1a1ff825 | 84 | /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */ |
5012a3a3 MT |
85 | u32 tvc_lun; |
86 | /* Pointer to the SGL formatted memory from virtio-scsi */ | |
87 | struct scatterlist *tvc_sgl; | |
b1935f68 | 88 | struct scatterlist *tvc_prot_sgl; |
3aee26b4 | 89 | struct page **tvc_upages; |
79c14141 | 90 | /* Pointer to response header iovec */ |
a77ec83a | 91 | struct iovec tvc_resp_iov; |
5012a3a3 MT |
92 | /* Pointer to vhost_scsi for our device */ |
93 | struct vhost_scsi *tvc_vhost; | |
94 | /* Pointer to vhost_virtqueue for the cmd */ | |
95 | struct vhost_virtqueue *tvc_vq; | |
96 | /* Pointer to vhost nexus memory */ | |
1a1ff825 | 97 | struct vhost_scsi_nexus *tvc_nexus; |
5012a3a3 MT |
98 | /* The TCM I/O descriptor that is accessed via container_of() */ |
99 | struct se_cmd tvc_se_cmd; | |
1a1ff825 | 100 | /* work item used for cmwq dispatch to vhost_scsi_submission_work() */ |
5012a3a3 MT |
101 | struct work_struct work; |
102 | /* Copy of the incoming SCSI command descriptor block (CDB) */ | |
1a1ff825 | 103 | unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE]; |
5012a3a3 MT |
104 | /* Sense buffer that will be mapped into outgoing status */ |
105 | unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER]; | |
106 | /* Completed commands list, serviced from vhost worker thread */ | |
107 | struct llist_node tvc_completion_list; | |
108 | /* Used to track inflight cmd */ | |
109 | struct vhost_scsi_inflight *inflight; | |
110 | }; | |
111 | ||
1a1ff825 | 112 | struct vhost_scsi_nexus { |
5012a3a3 MT |
113 | /* Pointer to TCM session for I_T Nexus */ |
114 | struct se_session *tvn_se_sess; | |
115 | }; | |
116 | ||
1a1ff825 | 117 | struct vhost_scsi_tpg { |
5012a3a3 MT |
118 | /* Vhost port target portal group tag for TCM */ |
119 | u16 tport_tpgt; | |
120 | /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */ | |
121 | int tv_tpg_port_count; | |
122 | /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */ | |
123 | int tv_tpg_vhost_count; | |
b1d75fe5 NB |
124 | /* Used for enabling T10-PI with legacy devices */ |
125 | int tv_fabric_prot_type; | |
1a1ff825 | 126 | /* list for vhost_scsi_list */ |
5012a3a3 MT |
127 | struct list_head tv_tpg_list; |
128 | /* Used to protect access for tpg_nexus */ | |
129 | struct mutex tv_tpg_mutex; | |
130 | /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */ | |
1a1ff825 NB |
131 | struct vhost_scsi_nexus *tpg_nexus; |
132 | /* Pointer back to vhost_scsi_tport */ | |
133 | struct vhost_scsi_tport *tport; | |
134 | /* Returned by vhost_scsi_make_tpg() */ | |
5012a3a3 MT |
135 | struct se_portal_group se_tpg; |
136 | /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */ | |
137 | struct vhost_scsi *vhost_scsi; | |
138 | }; | |
139 | ||
1a1ff825 | 140 | struct vhost_scsi_tport { |
5012a3a3 MT |
141 | /* SCSI protocol the tport is providing */ |
142 | u8 tport_proto_id; | |
143 | /* Binary World Wide unique Port Name for Vhost Target port */ | |
144 | u64 tport_wwpn; | |
145 | /* ASCII formatted WWPN for Vhost Target port */ | |
1a1ff825 NB |
146 | char tport_name[VHOST_SCSI_NAMELEN]; |
147 | /* Returned by vhost_scsi_make_tport() */ | |
5012a3a3 MT |
148 | struct se_wwn tport_wwn; |
149 | }; | |
150 | ||
1a1ff825 | 151 | struct vhost_scsi_evt { |
5012a3a3 MT |
152 | /* event to be sent to guest */ |
153 | struct virtio_scsi_event event; | |
154 | /* event list, serviced from vhost worker thread */ | |
155 | struct llist_node list; | |
156 | }; | |
057cbf49 | 157 | |
101998f6 NB |
158 | enum { |
159 | VHOST_SCSI_VQ_CTL = 0, | |
160 | VHOST_SCSI_VQ_EVT = 1, | |
161 | VHOST_SCSI_VQ_IO = 2, | |
162 | }; | |
163 | ||
e72fd72e | 164 | /* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */ |
5dade710 | 165 | enum { |
95e7c434 | 166 | VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) | |
4e9fa50c | 167 | (1ULL << VIRTIO_SCSI_F_T10_PI) |
5dade710 NB |
168 | }; |
169 | ||
1b7f390e AH |
170 | #define VHOST_SCSI_MAX_TARGET 256 |
171 | #define VHOST_SCSI_MAX_VQ 128 | |
a6c9af87 | 172 | #define VHOST_SCSI_MAX_EVENT 128 |
67e18cf9 | 173 | |
3ab2e420 AH |
174 | struct vhost_scsi_virtqueue { |
175 | struct vhost_virtqueue vq; | |
3dfbff32 MT |
176 | /* |
177 | * Reference counting for inflight reqs, used for flush operation. At | |
178 | * each time, one reference tracks new commands submitted, while we | |
179 | * wait for another one to reach 0. | |
180 | */ | |
f2f0173d | 181 | struct vhost_scsi_inflight inflights[2]; |
3dfbff32 MT |
182 | /* |
183 | * Indicate current inflight in use, protected by vq->mutex. | |
184 | * Writers must also take dev mutex and flush under it. | |
185 | */ | |
f2f0173d | 186 | int inflight_idx; |
3ab2e420 AH |
187 | }; |
188 | ||
057cbf49 | 189 | struct vhost_scsi { |
67e18cf9 | 190 | /* Protected by vhost_scsi->dev.mutex */ |
1a1ff825 | 191 | struct vhost_scsi_tpg **vs_tpg; |
67e18cf9 | 192 | char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
67e18cf9 | 193 | |
057cbf49 | 194 | struct vhost_dev dev; |
3ab2e420 | 195 | struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ]; |
057cbf49 NB |
196 | |
197 | struct vhost_work vs_completion_work; /* cmd completion work item */ | |
9d6064a3 | 198 | struct llist_head vs_completion_list; /* cmd completion queue */ |
a6c9af87 AH |
199 | |
200 | struct vhost_work vs_event_work; /* evt injection work item */ | |
201 | struct llist_head vs_event_list; /* evt injection queue */ | |
202 | ||
203 | bool vs_events_missed; /* any missed events, protected by vq->mutex */ | |
204 | int vs_events_nr; /* num of pending events, protected by vq->mutex */ | |
057cbf49 NB |
205 | }; |
206 | ||
1a1ff825 | 207 | static struct workqueue_struct *vhost_scsi_workqueue; |
057cbf49 | 208 | |
1a1ff825 NB |
209 | /* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */ |
210 | static DEFINE_MUTEX(vhost_scsi_mutex); | |
211 | static LIST_HEAD(vhost_scsi_list); | |
057cbf49 | 212 | |
1a1ff825 | 213 | static void vhost_scsi_done_inflight(struct kref *kref) |
f2f0173d AH |
214 | { |
215 | struct vhost_scsi_inflight *inflight; | |
216 | ||
217 | inflight = container_of(kref, struct vhost_scsi_inflight, kref); | |
218 | complete(&inflight->comp); | |
219 | } | |
220 | ||
1a1ff825 | 221 | static void vhost_scsi_init_inflight(struct vhost_scsi *vs, |
f2f0173d AH |
222 | struct vhost_scsi_inflight *old_inflight[]) |
223 | { | |
224 | struct vhost_scsi_inflight *new_inflight; | |
225 | struct vhost_virtqueue *vq; | |
226 | int idx, i; | |
227 | ||
228 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
229 | vq = &vs->vqs[i].vq; | |
230 | ||
231 | mutex_lock(&vq->mutex); | |
232 | ||
233 | /* store old infight */ | |
234 | idx = vs->vqs[i].inflight_idx; | |
235 | if (old_inflight) | |
236 | old_inflight[i] = &vs->vqs[i].inflights[idx]; | |
237 | ||
238 | /* setup new infight */ | |
239 | vs->vqs[i].inflight_idx = idx ^ 1; | |
240 | new_inflight = &vs->vqs[i].inflights[idx ^ 1]; | |
241 | kref_init(&new_inflight->kref); | |
242 | init_completion(&new_inflight->comp); | |
243 | ||
244 | mutex_unlock(&vq->mutex); | |
245 | } | |
246 | } | |
247 | ||
248 | static struct vhost_scsi_inflight * | |
1a1ff825 | 249 | vhost_scsi_get_inflight(struct vhost_virtqueue *vq) |
f2f0173d AH |
250 | { |
251 | struct vhost_scsi_inflight *inflight; | |
252 | struct vhost_scsi_virtqueue *svq; | |
253 | ||
254 | svq = container_of(vq, struct vhost_scsi_virtqueue, vq); | |
255 | inflight = &svq->inflights[svq->inflight_idx]; | |
256 | kref_get(&inflight->kref); | |
257 | ||
258 | return inflight; | |
259 | } | |
260 | ||
1a1ff825 | 261 | static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight) |
f2f0173d | 262 | { |
1a1ff825 | 263 | kref_put(&inflight->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
264 | } |
265 | ||
1a1ff825 | 266 | static int vhost_scsi_check_true(struct se_portal_group *se_tpg) |
057cbf49 NB |
267 | { |
268 | return 1; | |
269 | } | |
270 | ||
1a1ff825 | 271 | static int vhost_scsi_check_false(struct se_portal_group *se_tpg) |
057cbf49 NB |
272 | { |
273 | return 0; | |
274 | } | |
275 | ||
1a1ff825 | 276 | static char *vhost_scsi_get_fabric_name(void) |
057cbf49 NB |
277 | { |
278 | return "vhost"; | |
279 | } | |
280 | ||
1a1ff825 | 281 | static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg) |
057cbf49 | 282 | { |
1a1ff825 NB |
283 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
284 | struct vhost_scsi_tpg, se_tpg); | |
285 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
286 | |
287 | return &tport->tport_name[0]; | |
288 | } | |
289 | ||
1a1ff825 | 290 | static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg) |
057cbf49 | 291 | { |
1a1ff825 NB |
292 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
293 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 NB |
294 | return tpg->tport_tpgt; |
295 | } | |
296 | ||
b1d75fe5 NB |
297 | static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg) |
298 | { | |
299 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, | |
300 | struct vhost_scsi_tpg, se_tpg); | |
301 | ||
302 | return tpg->tv_fabric_prot_type; | |
303 | } | |
304 | ||
1a1ff825 | 305 | static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg) |
057cbf49 NB |
306 | { |
307 | return 1; | |
308 | } | |
309 | ||
1a1ff825 | 310 | static void vhost_scsi_release_cmd(struct se_cmd *se_cmd) |
057cbf49 | 311 | { |
1a1ff825 NB |
312 | struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd, |
313 | struct vhost_scsi_cmd, tvc_se_cmd); | |
de1419e4 | 314 | struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess; |
e31885dd | 315 | int i; |
084ed45b NB |
316 | |
317 | if (tv_cmd->tvc_sgl_count) { | |
084ed45b NB |
318 | for (i = 0; i < tv_cmd->tvc_sgl_count; i++) |
319 | put_page(sg_page(&tv_cmd->tvc_sgl[i])); | |
d3d665a6 | 320 | } |
e31885dd NB |
321 | if (tv_cmd->tvc_prot_sgl_count) { |
322 | for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++) | |
323 | put_page(sg_page(&tv_cmd->tvc_prot_sgl[i])); | |
324 | } | |
084ed45b | 325 | |
1a1ff825 | 326 | vhost_scsi_put_inflight(tv_cmd->inflight); |
4824d3bf | 327 | percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag); |
057cbf49 NB |
328 | } |
329 | ||
1a1ff825 | 330 | static u32 vhost_scsi_sess_get_index(struct se_session *se_sess) |
057cbf49 NB |
331 | { |
332 | return 0; | |
333 | } | |
334 | ||
1a1ff825 | 335 | static int vhost_scsi_write_pending(struct se_cmd *se_cmd) |
057cbf49 NB |
336 | { |
337 | /* Go ahead and process the write immediately */ | |
338 | target_execute_cmd(se_cmd); | |
339 | return 0; | |
340 | } | |
341 | ||
1a1ff825 | 342 | static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd) |
057cbf49 NB |
343 | { |
344 | return 0; | |
345 | } | |
346 | ||
1a1ff825 | 347 | static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl) |
057cbf49 NB |
348 | { |
349 | return; | |
350 | } | |
351 | ||
1a1ff825 | 352 | static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd) |
057cbf49 NB |
353 | { |
354 | return 0; | |
355 | } | |
356 | ||
1a1ff825 | 357 | static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd) |
101998f6 | 358 | { |
3c63f66a | 359 | struct vhost_scsi *vs = cmd->tvc_vhost; |
101998f6 | 360 | |
3c63f66a | 361 | llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
101998f6 NB |
362 | |
363 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
364 | } | |
057cbf49 | 365 | |
1a1ff825 | 366 | static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd) |
057cbf49 | 367 | { |
1a1ff825 NB |
368 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
369 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 370 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
371 | return 0; |
372 | } | |
373 | ||
1a1ff825 | 374 | static int vhost_scsi_queue_status(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 void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd) |
057cbf49 | 383 | { |
b79fafac | 384 | return; |
057cbf49 NB |
385 | } |
386 | ||
1a1ff825 | 387 | static void vhost_scsi_aborted_task(struct se_cmd *se_cmd) |
131e6abc NB |
388 | { |
389 | return; | |
390 | } | |
391 | ||
1a1ff825 | 392 | static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 AH |
393 | { |
394 | vs->vs_events_nr--; | |
395 | kfree(evt); | |
396 | } | |
397 | ||
1a1ff825 NB |
398 | static struct vhost_scsi_evt * |
399 | vhost_scsi_allocate_evt(struct vhost_scsi *vs, | |
683bd967 | 400 | u32 event, u32 reason) |
a6c9af87 | 401 | { |
3ab2e420 | 402 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
1a1ff825 | 403 | struct vhost_scsi_evt *evt; |
a6c9af87 AH |
404 | |
405 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
406 | vs->vs_events_missed = true; | |
407 | return NULL; | |
408 | } | |
409 | ||
410 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
411 | if (!evt) { | |
1a1ff825 | 412 | vq_err(vq, "Failed to allocate vhost_scsi_evt\n"); |
a6c9af87 AH |
413 | vs->vs_events_missed = true; |
414 | return NULL; | |
415 | } | |
416 | ||
e72fd72e MT |
417 | evt->event.event = cpu_to_vhost32(vq, event); |
418 | evt->event.reason = cpu_to_vhost32(vq, reason); | |
a6c9af87 AH |
419 | vs->vs_events_nr++; |
420 | ||
421 | return evt; | |
422 | } | |
423 | ||
1a1ff825 | 424 | static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd) |
057cbf49 | 425 | { |
3c63f66a | 426 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
427 | |
428 | /* TODO locking against target/backend threads? */ | |
6c131d0c | 429 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 430 | |
084ed45b | 431 | } |
f2f0173d | 432 | |
084ed45b NB |
433 | static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) |
434 | { | |
afc16604 | 435 | return target_put_sess_cmd(se_cmd); |
057cbf49 NB |
436 | } |
437 | ||
683bd967 | 438 | static void |
1a1ff825 | 439 | vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 | 440 | { |
3ab2e420 | 441 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
442 | struct virtio_scsi_event *event = &evt->event; |
443 | struct virtio_scsi_event __user *eventp; | |
444 | unsigned out, in; | |
445 | int head, ret; | |
446 | ||
447 | if (!vq->private_data) { | |
448 | vs->vs_events_missed = true; | |
449 | return; | |
450 | } | |
451 | ||
452 | again: | |
453 | vhost_disable_notify(&vs->dev, vq); | |
47283bef | 454 | head = vhost_get_vq_desc(vq, vq->iov, |
a6c9af87 AH |
455 | ARRAY_SIZE(vq->iov), &out, &in, |
456 | NULL, NULL); | |
457 | if (head < 0) { | |
458 | vs->vs_events_missed = true; | |
459 | return; | |
460 | } | |
461 | if (head == vq->num) { | |
462 | if (vhost_enable_notify(&vs->dev, vq)) | |
463 | goto again; | |
464 | vs->vs_events_missed = true; | |
465 | return; | |
466 | } | |
467 | ||
468 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { | |
469 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", | |
470 | vq->iov[out].iov_len); | |
471 | vs->vs_events_missed = true; | |
472 | return; | |
473 | } | |
474 | ||
475 | if (vs->vs_events_missed) { | |
e72fd72e | 476 | event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED); |
a6c9af87 AH |
477 | vs->vs_events_missed = false; |
478 | } | |
479 | ||
480 | eventp = vq->iov[out].iov_base; | |
481 | ret = __copy_to_user(eventp, event, sizeof(*event)); | |
482 | if (!ret) | |
483 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
484 | else | |
1a1ff825 | 485 | vq_err(vq, "Faulted on vhost_scsi_send_event\n"); |
a6c9af87 AH |
486 | } |
487 | ||
1a1ff825 | 488 | static void vhost_scsi_evt_work(struct vhost_work *work) |
a6c9af87 AH |
489 | { |
490 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
491 | vs_event_work); | |
3ab2e420 | 492 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
12bdcbd5 | 493 | struct vhost_scsi_evt *evt, *t; |
a6c9af87 AH |
494 | struct llist_node *llnode; |
495 | ||
496 | mutex_lock(&vq->mutex); | |
497 | llnode = llist_del_all(&vs->vs_event_list); | |
12bdcbd5 | 498 | llist_for_each_entry_safe(evt, t, llnode, list) { |
1a1ff825 NB |
499 | vhost_scsi_do_evt_work(vs, evt); |
500 | vhost_scsi_free_evt(vs, evt); | |
a6c9af87 AH |
501 | } |
502 | mutex_unlock(&vq->mutex); | |
503 | } | |
504 | ||
057cbf49 NB |
505 | /* Fill in status and signal that we are done processing this command |
506 | * | |
507 | * This is scheduled in the vhost work queue so we are called with the owner | |
508 | * process mm and can access the vring. | |
509 | */ | |
510 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) | |
511 | { | |
512 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
513 | vs_completion_work); | |
1b7f390e | 514 | DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 515 | struct virtio_scsi_cmd_resp v_rsp; |
816e85ed | 516 | struct vhost_scsi_cmd *cmd, *t; |
9d6064a3 AH |
517 | struct llist_node *llnode; |
518 | struct se_cmd *se_cmd; | |
79c14141 | 519 | struct iov_iter iov_iter; |
1b7f390e | 520 | int ret, vq; |
057cbf49 | 521 | |
1b7f390e | 522 | bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 523 | llnode = llist_del_all(&vs->vs_completion_list); |
816e85ed | 524 | llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) { |
3c63f66a | 525 | se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
526 | |
527 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
3c63f66a | 528 | cmd, se_cmd->residual_count, se_cmd->scsi_status); |
057cbf49 NB |
529 | |
530 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
e72fd72e | 531 | v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count); |
057cbf49 NB |
532 | /* TODO is status_qualifier field needed? */ |
533 | v_rsp.status = se_cmd->scsi_status; | |
e72fd72e MT |
534 | v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq, |
535 | se_cmd->scsi_sense_length); | |
3c63f66a | 536 | memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
e72fd72e | 537 | se_cmd->scsi_sense_length); |
79c14141 | 538 | |
a77ec83a | 539 | iov_iter_init(&iov_iter, READ, &cmd->tvc_resp_iov, |
79c14141 NB |
540 | cmd->tvc_in_iovs, sizeof(v_rsp)); |
541 | ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter); | |
542 | if (likely(ret == sizeof(v_rsp))) { | |
3ab2e420 | 543 | struct vhost_scsi_virtqueue *q; |
3c63f66a AH |
544 | vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
545 | q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); | |
3ab2e420 | 546 | vq = q - vs->vqs; |
1b7f390e AH |
547 | __set_bit(vq, signal); |
548 | } else | |
057cbf49 NB |
549 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
550 | ||
3c63f66a | 551 | vhost_scsi_free_cmd(cmd); |
057cbf49 NB |
552 | } |
553 | ||
1b7f390e AH |
554 | vq = -1; |
555 | while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) | |
556 | < VHOST_SCSI_MAX_VQ) | |
3ab2e420 | 557 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
558 | } |
559 | ||
1a1ff825 NB |
560 | static struct vhost_scsi_cmd * |
561 | vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg, | |
95e7c434 NB |
562 | unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr, |
563 | u32 exp_data_len, int data_direction) | |
057cbf49 | 564 | { |
1a1ff825 NB |
565 | struct vhost_scsi_cmd *cmd; |
566 | struct vhost_scsi_nexus *tv_nexus; | |
4824d3bf | 567 | struct se_session *se_sess; |
b1935f68 | 568 | struct scatterlist *sg, *prot_sg; |
3aee26b4 | 569 | struct page **pages; |
4824d3bf | 570 | int tag; |
057cbf49 | 571 | |
98718312 | 572 | tv_nexus = tpg->tpg_nexus; |
057cbf49 | 573 | if (!tv_nexus) { |
1a1ff825 | 574 | pr_err("Unable to locate active struct vhost_scsi_nexus\n"); |
057cbf49 NB |
575 | return ERR_PTR(-EIO); |
576 | } | |
4824d3bf | 577 | se_sess = tv_nexus->tvn_se_sess; |
057cbf49 | 578 | |
6f6b5d1e | 579 | tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING); |
4a47d3a1 | 580 | if (tag < 0) { |
1a1ff825 | 581 | pr_err("Unable to obtain tag for vhost_scsi_cmd\n"); |
4a47d3a1 NB |
582 | return ERR_PTR(-ENOMEM); |
583 | } | |
584 | ||
1a1ff825 | 585 | cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag]; |
3aee26b4 | 586 | sg = cmd->tvc_sgl; |
b1935f68 | 587 | prot_sg = cmd->tvc_prot_sgl; |
3aee26b4 | 588 | pages = cmd->tvc_upages; |
1a1ff825 | 589 | memset(cmd, 0, sizeof(struct vhost_scsi_cmd)); |
4824d3bf | 590 | |
3aee26b4 | 591 | cmd->tvc_sgl = sg; |
b1935f68 | 592 | cmd->tvc_prot_sgl = prot_sg; |
3aee26b4 | 593 | cmd->tvc_upages = pages; |
4824d3bf | 594 | cmd->tvc_se_cmd.map_tag = tag; |
95e7c434 NB |
595 | cmd->tvc_tag = scsi_tag; |
596 | cmd->tvc_lun = lun; | |
597 | cmd->tvc_task_attr = task_attr; | |
3c63f66a AH |
598 | cmd->tvc_exp_data_len = exp_data_len; |
599 | cmd->tvc_data_direction = data_direction; | |
600 | cmd->tvc_nexus = tv_nexus; | |
1a1ff825 | 601 | cmd->inflight = vhost_scsi_get_inflight(vq); |
3c63f66a | 602 | |
1a1ff825 | 603 | memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE); |
95e7c434 | 604 | |
3c63f66a | 605 | return cmd; |
057cbf49 NB |
606 | } |
607 | ||
608 | /* | |
609 | * Map a user memory range into a scatterlist | |
610 | * | |
611 | * Returns the number of scatterlist entries used or -errno on error. | |
612 | */ | |
683bd967 | 613 | static int |
1a1ff825 | 614 | vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd, |
2f240c4a | 615 | struct iov_iter *iter, |
3aee26b4 | 616 | struct scatterlist *sgl, |
5a01d082 | 617 | bool write) |
057cbf49 | 618 | { |
b4078b5f | 619 | struct page **pages = cmd->tvc_upages; |
2f240c4a AV |
620 | struct scatterlist *sg = sgl; |
621 | ssize_t bytes; | |
622 | size_t offset; | |
623 | unsigned int npages = 0; | |
3aee26b4 | 624 | |
2f240c4a AV |
625 | bytes = iov_iter_get_pages(iter, pages, LONG_MAX, |
626 | VHOST_SCSI_PREALLOC_UPAGES, &offset); | |
1810053e | 627 | /* No pages were pinned */ |
2f240c4a AV |
628 | if (bytes <= 0) |
629 | return bytes < 0 ? bytes : -EFAULT; | |
1810053e | 630 | |
2f240c4a | 631 | iov_iter_advance(iter, bytes); |
057cbf49 | 632 | |
2f240c4a AV |
633 | while (bytes) { |
634 | unsigned n = min_t(unsigned, PAGE_SIZE - offset, bytes); | |
635 | sg_set_page(sg++, pages[npages++], n, offset); | |
636 | bytes -= n; | |
637 | offset = 0; | |
638 | } | |
639 | return npages; | |
057cbf49 NB |
640 | } |
641 | ||
683bd967 | 642 | static int |
e8de56b5 | 643 | vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls) |
057cbf49 | 644 | { |
e8de56b5 | 645 | int sgl_count = 0; |
057cbf49 | 646 | |
e8de56b5 NB |
647 | if (!iter || !iter->iov) { |
648 | pr_err("%s: iter->iov is NULL, but expected bytes: %zu" | |
649 | " present\n", __func__, bytes); | |
650 | return -EINVAL; | |
651 | } | |
f3158f36 | 652 | |
e8de56b5 NB |
653 | sgl_count = iov_iter_npages(iter, 0xffff); |
654 | if (sgl_count > max_sgls) { | |
655 | pr_err("%s: requested sgl_count: %d exceeds pre-allocated" | |
656 | " max_sgls: %d\n", __func__, sgl_count, max_sgls); | |
657 | return -EINVAL; | |
5a01d082 | 658 | } |
e8de56b5 NB |
659 | return sgl_count; |
660 | } | |
057cbf49 | 661 | |
e8de56b5 | 662 | static int |
1a1ff825 NB |
663 | vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write, |
664 | struct iov_iter *iter, | |
665 | struct scatterlist *sg, int sg_count) | |
e8de56b5 | 666 | { |
11d49e9d | 667 | struct scatterlist *p = sg; |
2f240c4a | 668 | int ret; |
5a01d082 | 669 | |
2f240c4a AV |
670 | while (iov_iter_count(iter)) { |
671 | ret = vhost_scsi_map_to_sgl(cmd, iter, sg, write); | |
057cbf49 | 672 | if (ret < 0) { |
11d49e9d AV |
673 | while (p < sg) { |
674 | struct page *page = sg_page(p++); | |
e8de56b5 NB |
675 | if (page) |
676 | put_page(page); | |
677 | } | |
057cbf49 NB |
678 | return ret; |
679 | } | |
057cbf49 | 680 | sg += ret; |
057cbf49 NB |
681 | } |
682 | return 0; | |
683 | } | |
684 | ||
e31885dd | 685 | static int |
1a1ff825 | 686 | vhost_scsi_mapal(struct vhost_scsi_cmd *cmd, |
e8de56b5 NB |
687 | size_t prot_bytes, struct iov_iter *prot_iter, |
688 | size_t data_bytes, struct iov_iter *data_iter) | |
689 | { | |
690 | int sgl_count, ret; | |
691 | bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE); | |
692 | ||
693 | if (prot_bytes) { | |
694 | sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes, | |
1a1ff825 | 695 | VHOST_SCSI_PREALLOC_PROT_SGLS); |
e8de56b5 NB |
696 | if (sgl_count < 0) |
697 | return sgl_count; | |
698 | ||
699 | sg_init_table(cmd->tvc_prot_sgl, sgl_count); | |
700 | cmd->tvc_prot_sgl_count = sgl_count; | |
701 | pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__, | |
702 | cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count); | |
703 | ||
704 | ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter, | |
705 | cmd->tvc_prot_sgl, | |
706 | cmd->tvc_prot_sgl_count); | |
e31885dd | 707 | if (ret < 0) { |
e31885dd NB |
708 | cmd->tvc_prot_sgl_count = 0; |
709 | return ret; | |
710 | } | |
e8de56b5 NB |
711 | } |
712 | sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes, | |
1a1ff825 | 713 | VHOST_SCSI_PREALLOC_SGLS); |
e8de56b5 NB |
714 | if (sgl_count < 0) |
715 | return sgl_count; | |
716 | ||
717 | sg_init_table(cmd->tvc_sgl, sgl_count); | |
718 | cmd->tvc_sgl_count = sgl_count; | |
719 | pr_debug("%s data_sg %p data_sgl_count %u\n", __func__, | |
720 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
721 | ||
722 | ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter, | |
723 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
724 | if (ret < 0) { | |
725 | cmd->tvc_sgl_count = 0; | |
726 | return ret; | |
e31885dd NB |
727 | } |
728 | return 0; | |
729 | } | |
730 | ||
46243860 NB |
731 | static int vhost_scsi_to_tcm_attr(int attr) |
732 | { | |
733 | switch (attr) { | |
734 | case VIRTIO_SCSI_S_SIMPLE: | |
735 | return TCM_SIMPLE_TAG; | |
736 | case VIRTIO_SCSI_S_ORDERED: | |
737 | return TCM_ORDERED_TAG; | |
738 | case VIRTIO_SCSI_S_HEAD: | |
739 | return TCM_HEAD_TAG; | |
740 | case VIRTIO_SCSI_S_ACA: | |
741 | return TCM_ACA_TAG; | |
742 | default: | |
743 | break; | |
744 | } | |
745 | return TCM_SIMPLE_TAG; | |
746 | } | |
747 | ||
1a1ff825 | 748 | static void vhost_scsi_submission_work(struct work_struct *work) |
057cbf49 | 749 | { |
1a1ff825 NB |
750 | struct vhost_scsi_cmd *cmd = |
751 | container_of(work, struct vhost_scsi_cmd, work); | |
752 | struct vhost_scsi_nexus *tv_nexus; | |
3c63f66a | 753 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
95e7c434 NB |
754 | struct scatterlist *sg_ptr, *sg_prot_ptr = NULL; |
755 | int rc; | |
057cbf49 | 756 | |
95e7c434 | 757 | /* FIXME: BIDI operation */ |
3c63f66a AH |
758 | if (cmd->tvc_sgl_count) { |
759 | sg_ptr = cmd->tvc_sgl; | |
95e7c434 NB |
760 | |
761 | if (cmd->tvc_prot_sgl_count) | |
762 | sg_prot_ptr = cmd->tvc_prot_sgl; | |
763 | else | |
764 | se_cmd->prot_pto = true; | |
057cbf49 NB |
765 | } else { |
766 | sg_ptr = NULL; | |
767 | } | |
3c63f66a | 768 | tv_nexus = cmd->tvc_nexus; |
9f0abc15 | 769 | |
649ee054 | 770 | se_cmd->tag = 0; |
9f0abc15 | 771 | rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, |
3c63f66a AH |
772 | cmd->tvc_cdb, &cmd->tvc_sense_buf[0], |
773 | cmd->tvc_lun, cmd->tvc_exp_data_len, | |
46243860 NB |
774 | vhost_scsi_to_tcm_attr(cmd->tvc_task_attr), |
775 | cmd->tvc_data_direction, TARGET_SCF_ACK_KREF, | |
776 | sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr, | |
777 | cmd->tvc_prot_sgl_count); | |
057cbf49 NB |
778 | if (rc < 0) { |
779 | transport_send_check_condition_and_sense(se_cmd, | |
9f0abc15 | 780 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
057cbf49 | 781 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 782 | } |
057cbf49 NB |
783 | } |
784 | ||
683bd967 AH |
785 | static void |
786 | vhost_scsi_send_bad_target(struct vhost_scsi *vs, | |
787 | struct vhost_virtqueue *vq, | |
788 | int head, unsigned out) | |
637ab21e AH |
789 | { |
790 | struct virtio_scsi_cmd_resp __user *resp; | |
791 | struct virtio_scsi_cmd_resp rsp; | |
792 | int ret; | |
793 | ||
794 | memset(&rsp, 0, sizeof(rsp)); | |
795 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
796 | resp = vq->iov[out].iov_base; | |
797 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
798 | if (!ret) | |
799 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
800 | else | |
801 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
802 | } | |
803 | ||
683bd967 AH |
804 | static void |
805 | vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
057cbf49 | 806 | { |
1a1ff825 | 807 | struct vhost_scsi_tpg **vs_tpg, *tpg; |
057cbf49 | 808 | struct virtio_scsi_cmd_req v_req; |
95e7c434 | 809 | struct virtio_scsi_cmd_req_pi v_req_pi; |
1a1ff825 | 810 | struct vhost_scsi_cmd *cmd; |
09b13fa8 | 811 | struct iov_iter out_iter, in_iter, prot_iter, data_iter; |
95e7c434 | 812 | u64 tag; |
09b13fa8 | 813 | u32 exp_data_len, data_direction; |
532e15af | 814 | unsigned int out = 0, in = 0; |
09b13fa8 NB |
815 | int head, ret, prot_bytes; |
816 | size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp); | |
817 | size_t out_size, in_size; | |
95e7c434 NB |
818 | u16 lun; |
819 | u8 *target, *lunp, task_attr; | |
09b13fa8 | 820 | bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI); |
95e7c434 | 821 | void *req, *cdb; |
057cbf49 | 822 | |
e7802212 | 823 | mutex_lock(&vq->mutex); |
4f7f46d3 AH |
824 | /* |
825 | * We can handle the vq only after the endpoint is setup by calling the | |
826 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
4f7f46d3 | 827 | */ |
e7802212 | 828 | vs_tpg = vq->private_data; |
4f7f46d3 | 829 | if (!vs_tpg) |
e7802212 | 830 | goto out; |
057cbf49 | 831 | |
057cbf49 NB |
832 | vhost_disable_notify(&vs->dev, vq); |
833 | ||
834 | for (;;) { | |
47283bef | 835 | head = vhost_get_vq_desc(vq, vq->iov, |
09b13fa8 NB |
836 | ARRAY_SIZE(vq->iov), &out, &in, |
837 | NULL, NULL); | |
057cbf49 | 838 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", |
09b13fa8 | 839 | head, out, in); |
057cbf49 NB |
840 | /* On error, stop handling until the next kick. */ |
841 | if (unlikely(head < 0)) | |
842 | break; | |
843 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
844 | if (head == vq->num) { | |
845 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
846 | vhost_disable_notify(&vs->dev, vq); | |
847 | continue; | |
848 | } | |
849 | break; | |
850 | } | |
057cbf49 | 851 | /* |
09b13fa8 NB |
852 | * Check for a sane response buffer so we can report early |
853 | * errors back to the guest. | |
057cbf49 | 854 | */ |
09b13fa8 NB |
855 | if (unlikely(vq->iov[out].iov_len < rsp_size)) { |
856 | vq_err(vq, "Expecting at least virtio_scsi_cmd_resp" | |
857 | " size, got %zu bytes\n", vq->iov[out].iov_len); | |
057cbf49 NB |
858 | break; |
859 | } | |
09b13fa8 NB |
860 | /* |
861 | * Setup pointers and values based upon different virtio-scsi | |
862 | * request header if T10_PI is enabled in KVM guest. | |
863 | */ | |
864 | if (t10_pi) { | |
95e7c434 | 865 | req = &v_req_pi; |
09b13fa8 | 866 | req_size = sizeof(v_req_pi); |
95e7c434 NB |
867 | lunp = &v_req_pi.lun[0]; |
868 | target = &v_req_pi.lun[1]; | |
95e7c434 NB |
869 | } else { |
870 | req = &v_req; | |
09b13fa8 | 871 | req_size = sizeof(v_req); |
95e7c434 NB |
872 | lunp = &v_req.lun[0]; |
873 | target = &v_req.lun[1]; | |
95e7c434 | 874 | } |
09b13fa8 NB |
875 | /* |
876 | * FIXME: Not correct for BIDI operation | |
877 | */ | |
878 | out_size = iov_length(vq->iov, out); | |
879 | in_size = iov_length(&vq->iov[out], in); | |
95e7c434 | 880 | |
09b13fa8 NB |
881 | /* |
882 | * Copy over the virtio-scsi request header, which for a | |
883 | * ANY_LAYOUT enabled guest may span multiple iovecs, or a | |
884 | * single iovec may contain both the header + outgoing | |
885 | * WRITE payloads. | |
886 | * | |
887 | * copy_from_iter() will advance out_iter, so that it will | |
888 | * point at the start of the outgoing WRITE payload, if | |
889 | * DMA_TO_DEVICE is set. | |
890 | */ | |
891 | iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size); | |
057cbf49 | 892 | |
cbbd26b8 | 893 | if (unlikely(!copy_from_iter_full(req, req_size, &out_iter))) { |
09b13fa8 | 894 | vq_err(vq, "Faulted on copy_from_iter\n"); |
de1419e4 NB |
895 | vhost_scsi_send_bad_target(vs, vq, head, out); |
896 | continue; | |
057cbf49 | 897 | } |
7fe412d0 | 898 | /* virtio-scsi spec requires byte 0 of the lun to be 1 */ |
95e7c434 | 899 | if (unlikely(*lunp != 1)) { |
09b13fa8 | 900 | vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp); |
7fe412d0 VS |
901 | vhost_scsi_send_bad_target(vs, vq, head, out); |
902 | continue; | |
903 | } | |
904 | ||
6aa7de05 | 905 | tpg = READ_ONCE(vs_tpg[*target]); |
98718312 | 906 | if (unlikely(!tpg)) { |
09b13fa8 | 907 | /* Target does not exist, fail the request */ |
637ab21e | 908 | vhost_scsi_send_bad_target(vs, vq, head, out); |
67e18cf9 AH |
909 | continue; |
910 | } | |
95e7c434 | 911 | /* |
09b13fa8 NB |
912 | * Determine data_direction by calculating the total outgoing |
913 | * iovec sizes + incoming iovec sizes vs. virtio-scsi request + | |
914 | * response headers respectively. | |
95e7c434 | 915 | * |
09b13fa8 NB |
916 | * For DMA_TO_DEVICE this is out_iter, which is already pointing |
917 | * to the right place. | |
918 | * | |
919 | * For DMA_FROM_DEVICE, the iovec will be just past the end | |
920 | * of the virtio-scsi response header in either the same | |
921 | * or immediately following iovec. | |
95e7c434 | 922 | * |
09b13fa8 NB |
923 | * Any associated T10_PI bytes for the outgoing / incoming |
924 | * payloads are included in calculation of exp_data_len here. | |
95e7c434 | 925 | */ |
09b13fa8 NB |
926 | prot_bytes = 0; |
927 | ||
928 | if (out_size > req_size) { | |
929 | data_direction = DMA_TO_DEVICE; | |
930 | exp_data_len = out_size - req_size; | |
931 | data_iter = out_iter; | |
932 | } else if (in_size > rsp_size) { | |
933 | data_direction = DMA_FROM_DEVICE; | |
934 | exp_data_len = in_size - rsp_size; | |
935 | ||
936 | iov_iter_init(&in_iter, READ, &vq->iov[out], in, | |
937 | rsp_size + exp_data_len); | |
938 | iov_iter_advance(&in_iter, rsp_size); | |
939 | data_iter = in_iter; | |
940 | } else { | |
941 | data_direction = DMA_NONE; | |
942 | exp_data_len = 0; | |
943 | } | |
944 | /* | |
945 | * If T10_PI header + payload is present, setup prot_iter values | |
946 | * and recalculate data_iter for vhost_scsi_mapal() mapping to | |
947 | * host scatterlists via get_user_pages_fast(). | |
95e7c434 | 948 | */ |
09b13fa8 | 949 | if (t10_pi) { |
95e7c434 NB |
950 | if (v_req_pi.pi_bytesout) { |
951 | if (data_direction != DMA_TO_DEVICE) { | |
09b13fa8 NB |
952 | vq_err(vq, "Received non zero pi_bytesout," |
953 | " but wrong data_direction\n"); | |
de1419e4 NB |
954 | vhost_scsi_send_bad_target(vs, vq, head, out); |
955 | continue; | |
95e7c434 | 956 | } |
e72fd72e | 957 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout); |
95e7c434 NB |
958 | } else if (v_req_pi.pi_bytesin) { |
959 | if (data_direction != DMA_FROM_DEVICE) { | |
09b13fa8 NB |
960 | vq_err(vq, "Received non zero pi_bytesin," |
961 | " but wrong data_direction\n"); | |
de1419e4 NB |
962 | vhost_scsi_send_bad_target(vs, vq, head, out); |
963 | continue; | |
95e7c434 | 964 | } |
e72fd72e | 965 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin); |
95e7c434 | 966 | } |
09b13fa8 NB |
967 | /* |
968 | * Set prot_iter to data_iter, and advance past any | |
969 | * preceeding prot_bytes that may be present. | |
970 | * | |
971 | * Also fix up the exp_data_len to reflect only the | |
972 | * actual data payload length. | |
973 | */ | |
95e7c434 | 974 | if (prot_bytes) { |
09b13fa8 NB |
975 | exp_data_len -= prot_bytes; |
976 | prot_iter = data_iter; | |
977 | iov_iter_advance(&data_iter, prot_bytes); | |
95e7c434 | 978 | } |
e72fd72e | 979 | tag = vhost64_to_cpu(vq, v_req_pi.tag); |
95e7c434 NB |
980 | task_attr = v_req_pi.task_attr; |
981 | cdb = &v_req_pi.cdb[0]; | |
982 | lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF; | |
983 | } else { | |
e72fd72e | 984 | tag = vhost64_to_cpu(vq, v_req.tag); |
95e7c434 NB |
985 | task_attr = v_req.task_attr; |
986 | cdb = &v_req.cdb[0]; | |
987 | lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; | |
988 | } | |
95e7c434 | 989 | /* |
09b13fa8 NB |
990 | * Check that the received CDB size does not exceeded our |
991 | * hardcoded max for vhost-scsi, then get a pre-allocated | |
992 | * cmd descriptor for the new virtio-scsi tag. | |
95e7c434 NB |
993 | * |
994 | * TODO what if cdb was too small for varlen cdb header? | |
995 | */ | |
1a1ff825 | 996 | if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) { |
95e7c434 NB |
997 | vq_err(vq, "Received SCSI CDB with command_size: %d that" |
998 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
1a1ff825 | 999 | scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE); |
de1419e4 NB |
1000 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1001 | continue; | |
95e7c434 | 1002 | } |
95e7c434 | 1003 | cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr, |
9f977ef7 NB |
1004 | exp_data_len + prot_bytes, |
1005 | data_direction); | |
3c63f66a | 1006 | if (IS_ERR(cmd)) { |
4824d3bf | 1007 | vq_err(vq, "vhost_scsi_get_tag failed %ld\n", |
09b13fa8 | 1008 | PTR_ERR(cmd)); |
de1419e4 NB |
1009 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1010 | continue; | |
057cbf49 | 1011 | } |
3c63f66a AH |
1012 | cmd->tvc_vhost = vs; |
1013 | cmd->tvc_vq = vq; | |
a77ec83a | 1014 | cmd->tvc_resp_iov = vq->iov[out]; |
79c14141 | 1015 | cmd->tvc_in_iovs = in; |
057cbf49 | 1016 | |
057cbf49 | 1017 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", |
09b13fa8 NB |
1018 | cmd->tvc_cdb[0], cmd->tvc_lun); |
1019 | pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:" | |
1020 | " %d\n", cmd, exp_data_len, prot_bytes, data_direction); | |
057cbf49 NB |
1021 | |
1022 | if (data_direction != DMA_NONE) { | |
09b13fa8 NB |
1023 | ret = vhost_scsi_mapal(cmd, |
1024 | prot_bytes, &prot_iter, | |
1025 | exp_data_len, &data_iter); | |
057cbf49 NB |
1026 | if (unlikely(ret)) { |
1027 | vq_err(vq, "Failed to map iov to sgl\n"); | |
1a1ff825 | 1028 | vhost_scsi_release_cmd(&cmd->tvc_se_cmd); |
de1419e4 NB |
1029 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1030 | continue; | |
057cbf49 NB |
1031 | } |
1032 | } | |
057cbf49 NB |
1033 | /* |
1034 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
1035 | * complete the virtio-scsi request in TCM callback context via | |
09b13fa8 | 1036 | * vhost_scsi_queue_data_in() and vhost_scsi_queue_status() |
057cbf49 | 1037 | */ |
3c63f66a | 1038 | cmd->tvc_vq_desc = head; |
057cbf49 | 1039 | /* |
09b13fa8 NB |
1040 | * Dispatch cmd descriptor for cmwq execution in process |
1041 | * context provided by vhost_scsi_workqueue. This also ensures | |
1042 | * cmd is executed on the same kworker CPU as this vhost | |
1043 | * thread to gain positive L2 cache locality effects. | |
057cbf49 | 1044 | */ |
1a1ff825 NB |
1045 | INIT_WORK(&cmd->work, vhost_scsi_submission_work); |
1046 | queue_work(vhost_scsi_workqueue, &cmd->work); | |
057cbf49 | 1047 | } |
e7802212 | 1048 | out: |
7ea206cf | 1049 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
1050 | } |
1051 | ||
1052 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) | |
1053 | { | |
101998f6 | 1054 | pr_debug("%s: The handling func for control queue.\n", __func__); |
057cbf49 NB |
1055 | } |
1056 | ||
683bd967 | 1057 | static void |
1a1ff825 NB |
1058 | vhost_scsi_send_evt(struct vhost_scsi *vs, |
1059 | struct vhost_scsi_tpg *tpg, | |
683bd967 AH |
1060 | struct se_lun *lun, |
1061 | u32 event, | |
1062 | u32 reason) | |
a6c9af87 | 1063 | { |
1a1ff825 | 1064 | struct vhost_scsi_evt *evt; |
a6c9af87 | 1065 | |
1a1ff825 | 1066 | evt = vhost_scsi_allocate_evt(vs, event, reason); |
a6c9af87 AH |
1067 | if (!evt) |
1068 | return; | |
1069 | ||
1070 | if (tpg && lun) { | |
1071 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
1072 | /* | |
1073 | * Note: evt->event is zeroed when we allocate it and | |
1074 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
1075 | */ | |
1076 | evt->event.lun[0] = 0x01; | |
59c816c1 | 1077 | evt->event.lun[1] = tpg->tport_tpgt; |
a6c9af87 AH |
1078 | if (lun->unpacked_lun >= 256) |
1079 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
1080 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
1081 | } | |
1082 | ||
1083 | llist_add(&evt->list, &vs->vs_event_list); | |
1084 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
1085 | } | |
1086 | ||
057cbf49 NB |
1087 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
1088 | { | |
a6c9af87 AH |
1089 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1090 | poll.work); | |
1091 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1092 | ||
1093 | mutex_lock(&vq->mutex); | |
1094 | if (!vq->private_data) | |
1095 | goto out; | |
1096 | ||
1097 | if (vs->vs_events_missed) | |
1a1ff825 | 1098 | vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); |
a6c9af87 AH |
1099 | out: |
1100 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
1101 | } |
1102 | ||
1103 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
1104 | { | |
1105 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
1106 | poll.work); | |
1107 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1108 | ||
1b7f390e | 1109 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
1110 | } |
1111 | ||
4f7f46d3 AH |
1112 | static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
1113 | { | |
3ab2e420 | 1114 | vhost_poll_flush(&vs->vqs[index].vq.poll); |
4f7f46d3 AH |
1115 | } |
1116 | ||
3dfbff32 | 1117 | /* Callers must hold dev mutex */ |
4f7f46d3 AH |
1118 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
1119 | { | |
f2f0173d | 1120 | struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; |
4f7f46d3 AH |
1121 | int i; |
1122 | ||
f2f0173d | 1123 | /* Init new inflight and remember the old inflight */ |
1a1ff825 | 1124 | vhost_scsi_init_inflight(vs, old_inflight); |
f2f0173d AH |
1125 | |
1126 | /* | |
1127 | * The inflight->kref was initialized to 1. We decrement it here to | |
1128 | * indicate the start of the flush operation so that it will reach 0 | |
1129 | * when all the reqs are finished. | |
1130 | */ | |
1131 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1a1ff825 | 1132 | kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
1133 | |
1134 | /* Flush both the vhost poll and vhost work */ | |
4f7f46d3 AH |
1135 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
1136 | vhost_scsi_flush_vq(vs, i); | |
1137 | vhost_work_flush(&vs->dev, &vs->vs_completion_work); | |
a6c9af87 | 1138 | vhost_work_flush(&vs->dev, &vs->vs_event_work); |
f2f0173d AH |
1139 | |
1140 | /* Wait for all reqs issued before the flush to be finished */ | |
1141 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1142 | wait_for_completion(&old_inflight[i]->comp); | |
4f7f46d3 AH |
1143 | } |
1144 | ||
057cbf49 NB |
1145 | /* |
1146 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
1a1ff825 | 1147 | * vhost_scsi_tpg with an active struct vhost_scsi_nexus |
f2b7daf5 AH |
1148 | * |
1149 | * The lock nesting rule is: | |
1a1ff825 | 1150 | * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex |
057cbf49 | 1151 | */ |
683bd967 AH |
1152 | static int |
1153 | vhost_scsi_set_endpoint(struct vhost_scsi *vs, | |
1154 | struct vhost_scsi_target *t) | |
057cbf49 | 1155 | { |
ab8edab1 | 1156 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1157 | struct vhost_scsi_tport *tv_tport; |
1158 | struct vhost_scsi_tpg *tpg; | |
1159 | struct vhost_scsi_tpg **vs_tpg; | |
4f7f46d3 AH |
1160 | struct vhost_virtqueue *vq; |
1161 | int index, ret, i, len; | |
67e18cf9 | 1162 | bool match = false; |
057cbf49 | 1163 | |
1a1ff825 | 1164 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 1165 | mutex_lock(&vs->dev.mutex); |
f2b7daf5 | 1166 | |
057cbf49 NB |
1167 | /* Verify that ring has been setup correctly. */ |
1168 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
1169 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 1170 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
1171 | ret = -EFAULT; |
1172 | goto out; | |
057cbf49 NB |
1173 | } |
1174 | } | |
057cbf49 | 1175 | |
4f7f46d3 AH |
1176 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
1177 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
1178 | if (!vs_tpg) { | |
f2b7daf5 AH |
1179 | ret = -ENOMEM; |
1180 | goto out; | |
4f7f46d3 AH |
1181 | } |
1182 | if (vs->vs_tpg) | |
1183 | memcpy(vs_tpg, vs->vs_tpg, len); | |
1184 | ||
1a1ff825 | 1185 | list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) { |
98718312 AH |
1186 | mutex_lock(&tpg->tv_tpg_mutex); |
1187 | if (!tpg->tpg_nexus) { | |
1188 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1189 | continue; |
1190 | } | |
98718312 AH |
1191 | if (tpg->tv_tpg_vhost_count != 0) { |
1192 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1193 | continue; |
1194 | } | |
98718312 | 1195 | tv_tport = tpg->tport; |
057cbf49 | 1196 | |
67e18cf9 | 1197 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
98718312 | 1198 | if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
4f7f46d3 | 1199 | kfree(vs_tpg); |
98718312 | 1200 | mutex_unlock(&tpg->tv_tpg_mutex); |
f2b7daf5 AH |
1201 | ret = -EEXIST; |
1202 | goto out; | |
101998f6 | 1203 | } |
ab8edab1 NB |
1204 | /* |
1205 | * In order to ensure individual vhost-scsi configfs | |
1206 | * groups cannot be removed while in use by vhost ioctl, | |
1207 | * go ahead and take an explicit se_tpg->tpg_group.cg_item | |
1208 | * dependency now. | |
1209 | */ | |
1210 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1211 | ret = target_depend_item(&se_tpg->tpg_group.cg_item); |
ab8edab1 NB |
1212 | if (ret) { |
1213 | pr_warn("configfs_depend_item() failed: %d\n", ret); | |
1214 | kfree(vs_tpg); | |
1215 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1216 | goto out; | |
1217 | } | |
98718312 AH |
1218 | tpg->tv_tpg_vhost_count++; |
1219 | tpg->vhost_scsi = vs; | |
1220 | vs_tpg[tpg->tport_tpgt] = tpg; | |
4e857c58 | 1221 | smp_mb__after_atomic(); |
67e18cf9 | 1222 | match = true; |
057cbf49 | 1223 | } |
98718312 | 1224 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1225 | } |
67e18cf9 AH |
1226 | |
1227 | if (match) { | |
1228 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1229 | sizeof(vs->vs_vhost_wwpn)); | |
4f7f46d3 | 1230 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
3ab2e420 | 1231 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1232 | mutex_lock(&vq->mutex); |
22fa90c7 | 1233 | vq->private_data = vs_tpg; |
80f7d030 | 1234 | vhost_vq_init_access(vq); |
4f7f46d3 AH |
1235 | mutex_unlock(&vq->mutex); |
1236 | } | |
67e18cf9 AH |
1237 | ret = 0; |
1238 | } else { | |
1239 | ret = -EEXIST; | |
1240 | } | |
1241 | ||
4f7f46d3 AH |
1242 | /* |
1243 | * Act as synchronize_rcu to make sure access to | |
1244 | * old vs->vs_tpg is finished. | |
1245 | */ | |
1246 | vhost_scsi_flush(vs); | |
1247 | kfree(vs->vs_tpg); | |
1248 | vs->vs_tpg = vs_tpg; | |
1249 | ||
f2b7daf5 | 1250 | out: |
67e18cf9 | 1251 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1252 | mutex_unlock(&vhost_scsi_mutex); |
67e18cf9 | 1253 | return ret; |
057cbf49 NB |
1254 | } |
1255 | ||
683bd967 AH |
1256 | static int |
1257 | vhost_scsi_clear_endpoint(struct vhost_scsi *vs, | |
1258 | struct vhost_scsi_target *t) | |
057cbf49 | 1259 | { |
ab8edab1 | 1260 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1261 | struct vhost_scsi_tport *tv_tport; |
1262 | struct vhost_scsi_tpg *tpg; | |
4f7f46d3 AH |
1263 | struct vhost_virtqueue *vq; |
1264 | bool match = false; | |
67e18cf9 AH |
1265 | int index, ret, i; |
1266 | u8 target; | |
057cbf49 | 1267 | |
1a1ff825 | 1268 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 NB |
1269 | mutex_lock(&vs->dev.mutex); |
1270 | /* Verify that ring has been setup correctly. */ | |
1271 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1272 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1273 | ret = -EFAULT; |
038e0af4 | 1274 | goto err_dev; |
057cbf49 NB |
1275 | } |
1276 | } | |
4f7f46d3 AH |
1277 | |
1278 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1279 | ret = 0; |
1280 | goto err_dev; | |
4f7f46d3 AH |
1281 | } |
1282 | ||
67e18cf9 AH |
1283 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1284 | target = i; | |
98718312 AH |
1285 | tpg = vs->vs_tpg[target]; |
1286 | if (!tpg) | |
67e18cf9 AH |
1287 | continue; |
1288 | ||
98718312 AH |
1289 | mutex_lock(&tpg->tv_tpg_mutex); |
1290 | tv_tport = tpg->tport; | |
67e18cf9 AH |
1291 | if (!tv_tport) { |
1292 | ret = -ENODEV; | |
038e0af4 | 1293 | goto err_tpg; |
67e18cf9 AH |
1294 | } |
1295 | ||
1296 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
98718312 | 1297 | pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" |
67e18cf9 | 1298 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", |
98718312 | 1299 | tv_tport->tport_name, tpg->tport_tpgt, |
67e18cf9 AH |
1300 | t->vhost_wwpn, t->vhost_tpgt); |
1301 | ret = -EINVAL; | |
038e0af4 | 1302 | goto err_tpg; |
67e18cf9 | 1303 | } |
98718312 AH |
1304 | tpg->tv_tpg_vhost_count--; |
1305 | tpg->vhost_scsi = NULL; | |
67e18cf9 | 1306 | vs->vs_tpg[target] = NULL; |
4f7f46d3 | 1307 | match = true; |
98718312 | 1308 | mutex_unlock(&tpg->tv_tpg_mutex); |
ab8edab1 NB |
1309 | /* |
1310 | * Release se_tpg->tpg_group.cg_item configfs dependency now | |
1311 | * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur. | |
1312 | */ | |
1313 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1314 | target_undepend_item(&se_tpg->tpg_group.cg_item); |
057cbf49 | 1315 | } |
4f7f46d3 AH |
1316 | if (match) { |
1317 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
3ab2e420 | 1318 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1319 | mutex_lock(&vq->mutex); |
22fa90c7 | 1320 | vq->private_data = NULL; |
4f7f46d3 AH |
1321 | mutex_unlock(&vq->mutex); |
1322 | } | |
1323 | } | |
1324 | /* | |
1325 | * Act as synchronize_rcu to make sure access to | |
1326 | * old vs->vs_tpg is finished. | |
1327 | */ | |
1328 | vhost_scsi_flush(vs); | |
1329 | kfree(vs->vs_tpg); | |
1330 | vs->vs_tpg = NULL; | |
a6c9af87 | 1331 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1332 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1333 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 1334 | return 0; |
101998f6 | 1335 | |
038e0af4 | 1336 | err_tpg: |
98718312 | 1337 | mutex_unlock(&tpg->tv_tpg_mutex); |
038e0af4 | 1338 | err_dev: |
101998f6 | 1339 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1340 | mutex_unlock(&vhost_scsi_mutex); |
101998f6 | 1341 | return ret; |
057cbf49 NB |
1342 | } |
1343 | ||
4f7f46d3 AH |
1344 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1345 | { | |
ea16c514 MT |
1346 | struct vhost_virtqueue *vq; |
1347 | int i; | |
1348 | ||
4f7f46d3 AH |
1349 | if (features & ~VHOST_SCSI_FEATURES) |
1350 | return -EOPNOTSUPP; | |
1351 | ||
1352 | mutex_lock(&vs->dev.mutex); | |
1353 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1354 | !vhost_log_access_ok(&vs->dev)) { | |
1355 | mutex_unlock(&vs->dev.mutex); | |
1356 | return -EFAULT; | |
1357 | } | |
ea16c514 MT |
1358 | |
1359 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
1360 | vq = &vs->vqs[i].vq; | |
1361 | mutex_lock(&vq->mutex); | |
1362 | vq->acked_features = features; | |
1363 | mutex_unlock(&vq->mutex); | |
1364 | } | |
4f7f46d3 AH |
1365 | mutex_unlock(&vs->dev.mutex); |
1366 | return 0; | |
1367 | } | |
1368 | ||
057cbf49 NB |
1369 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1370 | { | |
c7289312 | 1371 | struct vhost_scsi *vs; |
3ab2e420 | 1372 | struct vhost_virtqueue **vqs; |
595cb754 | 1373 | int r = -ENOMEM, i; |
057cbf49 | 1374 | |
dcda9b04 | 1375 | vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_RETRY_MAYFAIL); |
595cb754 MT |
1376 | if (!vs) { |
1377 | vs = vzalloc(sizeof(*vs)); | |
1378 | if (!vs) | |
1379 | goto err_vs; | |
1380 | } | |
057cbf49 | 1381 | |
3ab2e420 | 1382 | vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL); |
595cb754 MT |
1383 | if (!vqs) |
1384 | goto err_vqs; | |
3ab2e420 | 1385 | |
c7289312 | 1386 | vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); |
1a1ff825 | 1387 | vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work); |
a6c9af87 | 1388 | |
c7289312 AH |
1389 | vs->vs_events_nr = 0; |
1390 | vs->vs_events_missed = false; | |
057cbf49 | 1391 | |
c7289312 AH |
1392 | vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; |
1393 | vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1394 | vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1395 | vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
3ab2e420 | 1396 | for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { |
c7289312 AH |
1397 | vqs[i] = &vs->vqs[i].vq; |
1398 | vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
3ab2e420 | 1399 | } |
59566b6e | 1400 | vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ); |
f2f0173d | 1401 | |
1a1ff825 | 1402 | vhost_scsi_init_inflight(vs, NULL); |
f2f0173d | 1403 | |
c7289312 | 1404 | f->private_data = vs; |
057cbf49 | 1405 | return 0; |
595cb754 | 1406 | |
595cb754 | 1407 | err_vqs: |
68404441 | 1408 | kvfree(vs); |
595cb754 MT |
1409 | err_vs: |
1410 | return r; | |
057cbf49 NB |
1411 | } |
1412 | ||
1413 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1414 | { | |
c7289312 | 1415 | struct vhost_scsi *vs = f->private_data; |
67e18cf9 | 1416 | struct vhost_scsi_target t; |
057cbf49 | 1417 | |
c7289312 AH |
1418 | mutex_lock(&vs->dev.mutex); |
1419 | memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1420 | mutex_unlock(&vs->dev.mutex); | |
1421 | vhost_scsi_clear_endpoint(vs, &t); | |
1422 | vhost_dev_stop(&vs->dev); | |
1423 | vhost_dev_cleanup(&vs->dev, false); | |
a6c9af87 | 1424 | /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
c7289312 AH |
1425 | vhost_scsi_flush(vs); |
1426 | kfree(vs->dev.vqs); | |
68404441 | 1427 | kvfree(vs); |
057cbf49 NB |
1428 | return 0; |
1429 | } | |
1430 | ||
683bd967 AH |
1431 | static long |
1432 | vhost_scsi_ioctl(struct file *f, | |
1433 | unsigned int ioctl, | |
1434 | unsigned long arg) | |
057cbf49 NB |
1435 | { |
1436 | struct vhost_scsi *vs = f->private_data; | |
1437 | struct vhost_scsi_target backend; | |
1438 | void __user *argp = (void __user *)arg; | |
1439 | u64 __user *featurep = argp; | |
11c63418 AH |
1440 | u32 __user *eventsp = argp; |
1441 | u32 events_missed; | |
057cbf49 | 1442 | u64 features; |
101998f6 | 1443 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1444 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1445 | |
1446 | switch (ioctl) { | |
1447 | case VHOST_SCSI_SET_ENDPOINT: | |
1448 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1449 | return -EFAULT; | |
6de7145c MT |
1450 | if (backend.reserved != 0) |
1451 | return -EOPNOTSUPP; | |
057cbf49 NB |
1452 | |
1453 | return vhost_scsi_set_endpoint(vs, &backend); | |
1454 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1455 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1456 | return -EFAULT; | |
6de7145c MT |
1457 | if (backend.reserved != 0) |
1458 | return -EOPNOTSUPP; | |
057cbf49 NB |
1459 | |
1460 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1461 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1462 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1463 | return -EFAULT; |
1464 | return 0; | |
11c63418 AH |
1465 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1466 | if (get_user(events_missed, eventsp)) | |
1467 | return -EFAULT; | |
1468 | mutex_lock(&vq->mutex); | |
1469 | vs->vs_events_missed = events_missed; | |
1470 | mutex_unlock(&vq->mutex); | |
1471 | return 0; | |
1472 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1473 | mutex_lock(&vq->mutex); | |
1474 | events_missed = vs->vs_events_missed; | |
1475 | mutex_unlock(&vq->mutex); | |
1476 | if (put_user(events_missed, eventsp)) | |
1477 | return -EFAULT; | |
1478 | return 0; | |
057cbf49 | 1479 | case VHOST_GET_FEATURES: |
5dade710 | 1480 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1481 | if (copy_to_user(featurep, &features, sizeof features)) |
1482 | return -EFAULT; | |
1483 | return 0; | |
1484 | case VHOST_SET_FEATURES: | |
1485 | if (copy_from_user(&features, featurep, sizeof features)) | |
1486 | return -EFAULT; | |
1487 | return vhost_scsi_set_features(vs, features); | |
1488 | default: | |
1489 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1490 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1491 | /* TODO: flush backend after dev ioctl. */ | |
1492 | if (r == -ENOIOCTLCMD) | |
1493 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1494 | mutex_unlock(&vs->dev.mutex); |
1495 | return r; | |
1496 | } | |
1497 | } | |
1498 | ||
101998f6 NB |
1499 | #ifdef CONFIG_COMPAT |
1500 | static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, | |
1501 | unsigned long arg) | |
1502 | { | |
1503 | return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1504 | } | |
1505 | #endif | |
1506 | ||
057cbf49 NB |
1507 | static const struct file_operations vhost_scsi_fops = { |
1508 | .owner = THIS_MODULE, | |
1509 | .release = vhost_scsi_release, | |
1510 | .unlocked_ioctl = vhost_scsi_ioctl, | |
101998f6 NB |
1511 | #ifdef CONFIG_COMPAT |
1512 | .compat_ioctl = vhost_scsi_compat_ioctl, | |
1513 | #endif | |
057cbf49 NB |
1514 | .open = vhost_scsi_open, |
1515 | .llseek = noop_llseek, | |
1516 | }; | |
1517 | ||
1518 | static struct miscdevice vhost_scsi_misc = { | |
1519 | MISC_DYNAMIC_MINOR, | |
1520 | "vhost-scsi", | |
1521 | &vhost_scsi_fops, | |
1522 | }; | |
1523 | ||
1524 | static int __init vhost_scsi_register(void) | |
1525 | { | |
1526 | return misc_register(&vhost_scsi_misc); | |
1527 | } | |
1528 | ||
f368ed60 | 1529 | static void vhost_scsi_deregister(void) |
057cbf49 | 1530 | { |
f368ed60 | 1531 | misc_deregister(&vhost_scsi_misc); |
057cbf49 NB |
1532 | } |
1533 | ||
1a1ff825 | 1534 | static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport) |
057cbf49 NB |
1535 | { |
1536 | switch (tport->tport_proto_id) { | |
1537 | case SCSI_PROTOCOL_SAS: | |
1538 | return "SAS"; | |
1539 | case SCSI_PROTOCOL_FCP: | |
1540 | return "FCP"; | |
1541 | case SCSI_PROTOCOL_ISCSI: | |
1542 | return "iSCSI"; | |
1543 | default: | |
1544 | break; | |
1545 | } | |
1546 | ||
1547 | return "Unknown"; | |
1548 | } | |
1549 | ||
683bd967 | 1550 | static void |
1a1ff825 | 1551 | vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg, |
683bd967 | 1552 | struct se_lun *lun, bool plug) |
a6c9af87 AH |
1553 | { |
1554 | ||
1555 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1556 | struct vhost_virtqueue *vq; | |
1557 | u32 reason; | |
1558 | ||
1559 | if (!vs) | |
1560 | return; | |
1561 | ||
1562 | mutex_lock(&vs->dev.mutex); | |
a6c9af87 AH |
1563 | |
1564 | if (plug) | |
1565 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1566 | else | |
1567 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1568 | ||
3ab2e420 | 1569 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 | 1570 | mutex_lock(&vq->mutex); |
ea16c514 | 1571 | if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG)) |
1a1ff825 | 1572 | vhost_scsi_send_evt(vs, tpg, lun, |
ea16c514 | 1573 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); |
a6c9af87 AH |
1574 | mutex_unlock(&vq->mutex); |
1575 | mutex_unlock(&vs->dev.mutex); | |
1576 | } | |
1577 | ||
1a1ff825 | 1578 | static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1579 | { |
1a1ff825 | 1580 | vhost_scsi_do_plug(tpg, lun, true); |
a6c9af87 AH |
1581 | } |
1582 | ||
1a1ff825 | 1583 | static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1584 | { |
1a1ff825 | 1585 | vhost_scsi_do_plug(tpg, lun, false); |
a6c9af87 AH |
1586 | } |
1587 | ||
1a1ff825 | 1588 | static int vhost_scsi_port_link(struct se_portal_group *se_tpg, |
683bd967 | 1589 | struct se_lun *lun) |
057cbf49 | 1590 | { |
1a1ff825 NB |
1591 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1592 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1593 | |
1a1ff825 | 1594 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1595 | |
98718312 AH |
1596 | mutex_lock(&tpg->tv_tpg_mutex); |
1597 | tpg->tv_tpg_port_count++; | |
1598 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 | 1599 | |
1a1ff825 | 1600 | vhost_scsi_hotplug(tpg, lun); |
a6c9af87 | 1601 | |
1a1ff825 | 1602 | mutex_unlock(&vhost_scsi_mutex); |
a6c9af87 | 1603 | |
057cbf49 NB |
1604 | return 0; |
1605 | } | |
1606 | ||
1a1ff825 | 1607 | static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg, |
683bd967 | 1608 | struct se_lun *lun) |
057cbf49 | 1609 | { |
1a1ff825 NB |
1610 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1611 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1612 | |
1a1ff825 | 1613 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1614 | |
98718312 AH |
1615 | mutex_lock(&tpg->tv_tpg_mutex); |
1616 | tpg->tv_tpg_port_count--; | |
1617 | mutex_unlock(&tpg->tv_tpg_mutex); | |
a6c9af87 | 1618 | |
1a1ff825 | 1619 | vhost_scsi_hotunplug(tpg, lun); |
a6c9af87 | 1620 | |
1a1ff825 | 1621 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 NB |
1622 | } |
1623 | ||
65ea7898 | 1624 | static void vhost_scsi_free_cmd_map_res(struct se_session *se_sess) |
3aee26b4 | 1625 | { |
1a1ff825 | 1626 | struct vhost_scsi_cmd *tv_cmd; |
3aee26b4 NB |
1627 | unsigned int i; |
1628 | ||
1629 | if (!se_sess->sess_cmd_map) | |
1630 | return; | |
1631 | ||
1a1ff825 NB |
1632 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1633 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 NB |
1634 | |
1635 | kfree(tv_cmd->tvc_sgl); | |
b1935f68 | 1636 | kfree(tv_cmd->tvc_prot_sgl); |
3aee26b4 NB |
1637 | kfree(tv_cmd->tvc_upages); |
1638 | } | |
1639 | } | |
1640 | ||
2eafd729 CH |
1641 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store( |
1642 | struct config_item *item, const char *page, size_t count) | |
b1d75fe5 | 1643 | { |
2eafd729 | 1644 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
b1d75fe5 NB |
1645 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1646 | struct vhost_scsi_tpg, se_tpg); | |
1647 | unsigned long val; | |
1648 | int ret = kstrtoul(page, 0, &val); | |
1649 | ||
1650 | if (ret) { | |
1651 | pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); | |
1652 | return ret; | |
1653 | } | |
1654 | if (val != 0 && val != 1 && val != 3) { | |
1655 | pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val); | |
1656 | return -EINVAL; | |
1657 | } | |
1658 | tpg->tv_fabric_prot_type = val; | |
1659 | ||
1660 | return count; | |
1661 | } | |
1662 | ||
2eafd729 CH |
1663 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show( |
1664 | struct config_item *item, char *page) | |
b1d75fe5 | 1665 | { |
2eafd729 | 1666 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
b1d75fe5 NB |
1667 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1668 | struct vhost_scsi_tpg, se_tpg); | |
1669 | ||
1670 | return sprintf(page, "%d\n", tpg->tv_fabric_prot_type); | |
1671 | } | |
2eafd729 CH |
1672 | |
1673 | CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type); | |
b1d75fe5 NB |
1674 | |
1675 | static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = { | |
2eafd729 | 1676 | &vhost_scsi_tpg_attrib_attr_fabric_prot_type, |
b1d75fe5 NB |
1677 | NULL, |
1678 | }; | |
1679 | ||
65ea7898 NB |
1680 | static int vhost_scsi_nexus_cb(struct se_portal_group *se_tpg, |
1681 | struct se_session *se_sess, void *p) | |
057cbf49 | 1682 | { |
1a1ff825 | 1683 | struct vhost_scsi_cmd *tv_cmd; |
3aee26b4 | 1684 | unsigned int i; |
057cbf49 | 1685 | |
1a1ff825 NB |
1686 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1687 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 NB |
1688 | |
1689 | tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) * | |
1a1ff825 | 1690 | VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL); |
3aee26b4 | 1691 | if (!tv_cmd->tvc_sgl) { |
3aee26b4 NB |
1692 | pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); |
1693 | goto out; | |
1694 | } | |
1695 | ||
1696 | tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) * | |
65ea7898 | 1697 | VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL); |
3aee26b4 | 1698 | if (!tv_cmd->tvc_upages) { |
3aee26b4 NB |
1699 | pr_err("Unable to allocate tv_cmd->tvc_upages\n"); |
1700 | goto out; | |
1701 | } | |
b1935f68 NB |
1702 | |
1703 | tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) * | |
65ea7898 | 1704 | VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL); |
b1935f68 | 1705 | if (!tv_cmd->tvc_prot_sgl) { |
b1935f68 NB |
1706 | pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); |
1707 | goto out; | |
1708 | } | |
3aee26b4 | 1709 | } |
65ea7898 NB |
1710 | return 0; |
1711 | out: | |
1712 | vhost_scsi_free_cmd_map_res(se_sess); | |
1713 | return -ENOMEM; | |
1714 | } | |
1715 | ||
1716 | static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg, | |
1717 | const char *name) | |
1718 | { | |
65ea7898 NB |
1719 | struct vhost_scsi_nexus *tv_nexus; |
1720 | ||
1721 | mutex_lock(&tpg->tv_tpg_mutex); | |
1722 | if (tpg->tpg_nexus) { | |
1723 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1724 | pr_debug("tpg->tpg_nexus already exists\n"); | |
1725 | return -EEXIST; | |
1726 | } | |
65ea7898 NB |
1727 | |
1728 | tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL); | |
1729 | if (!tv_nexus) { | |
1730 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1731 | pr_err("Unable to allocate struct vhost_scsi_nexus\n"); | |
1732 | return -ENOMEM; | |
1733 | } | |
057cbf49 NB |
1734 | /* |
1735 | * Since we are running in 'demo mode' this call with generate a | |
1a1ff825 | 1736 | * struct se_node_acl for the vhost_scsi struct se_portal_group with |
057cbf49 NB |
1737 | * the SCSI Initiator port name of the passed configfs group 'name'. |
1738 | */ | |
65ea7898 NB |
1739 | tv_nexus->tvn_se_sess = target_alloc_session(&tpg->se_tpg, |
1740 | VHOST_SCSI_DEFAULT_TAGS, | |
1741 | sizeof(struct vhost_scsi_cmd), | |
1742 | TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS, | |
1743 | (unsigned char *)name, tv_nexus, | |
1744 | vhost_scsi_nexus_cb); | |
1745 | if (IS_ERR(tv_nexus->tvn_se_sess)) { | |
98718312 | 1746 | mutex_unlock(&tpg->tv_tpg_mutex); |
65ea7898 NB |
1747 | kfree(tv_nexus); |
1748 | return -ENOMEM; | |
057cbf49 | 1749 | } |
98718312 | 1750 | tpg->tpg_nexus = tv_nexus; |
057cbf49 | 1751 | |
98718312 | 1752 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1753 | return 0; |
1754 | } | |
1755 | ||
1a1ff825 | 1756 | static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg) |
057cbf49 NB |
1757 | { |
1758 | struct se_session *se_sess; | |
1a1ff825 | 1759 | struct vhost_scsi_nexus *tv_nexus; |
057cbf49 NB |
1760 | |
1761 | mutex_lock(&tpg->tv_tpg_mutex); | |
1762 | tv_nexus = tpg->tpg_nexus; | |
1763 | if (!tv_nexus) { | |
1764 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1765 | return -ENODEV; | |
1766 | } | |
1767 | ||
1768 | se_sess = tv_nexus->tvn_se_sess; | |
1769 | if (!se_sess) { | |
1770 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1771 | return -ENODEV; | |
1772 | } | |
1773 | ||
101998f6 | 1774 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 1775 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1776 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1777 | " active TPG port count: %d\n", |
101998f6 NB |
1778 | tpg->tv_tpg_port_count); |
1779 | return -EBUSY; | |
057cbf49 NB |
1780 | } |
1781 | ||
101998f6 | 1782 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 1783 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1784 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1785 | " active TPG vhost count: %d\n", |
101998f6 NB |
1786 | tpg->tv_tpg_vhost_count); |
1787 | return -EBUSY; | |
057cbf49 NB |
1788 | } |
1789 | ||
101998f6 | 1790 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
1a1ff825 | 1791 | " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport), |
057cbf49 | 1792 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
3aee26b4 | 1793 | |
65ea7898 | 1794 | vhost_scsi_free_cmd_map_res(se_sess); |
057cbf49 | 1795 | /* |
101998f6 | 1796 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 NB |
1797 | */ |
1798 | transport_deregister_session(tv_nexus->tvn_se_sess); | |
1799 | tpg->tpg_nexus = NULL; | |
1800 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1801 | ||
1802 | kfree(tv_nexus); | |
1803 | return 0; | |
1804 | } | |
1805 | ||
2eafd729 | 1806 | static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page) |
057cbf49 | 1807 | { |
2eafd729 | 1808 | struct se_portal_group *se_tpg = to_tpg(item); |
1a1ff825 NB |
1809 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1810 | struct vhost_scsi_tpg, se_tpg); | |
1811 | struct vhost_scsi_nexus *tv_nexus; | |
057cbf49 NB |
1812 | ssize_t ret; |
1813 | ||
98718312 AH |
1814 | mutex_lock(&tpg->tv_tpg_mutex); |
1815 | tv_nexus = tpg->tpg_nexus; | |
057cbf49 | 1816 | if (!tv_nexus) { |
98718312 | 1817 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1818 | return -ENODEV; |
1819 | } | |
1820 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1821 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
98718312 | 1822 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1823 | |
1824 | return ret; | |
1825 | } | |
1826 | ||
2eafd729 CH |
1827 | static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item, |
1828 | const char *page, size_t count) | |
057cbf49 | 1829 | { |
2eafd729 | 1830 | struct se_portal_group *se_tpg = to_tpg(item); |
1a1ff825 NB |
1831 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1832 | struct vhost_scsi_tpg, se_tpg); | |
1833 | struct vhost_scsi_tport *tport_wwn = tpg->tport; | |
1834 | unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr; | |
057cbf49 NB |
1835 | int ret; |
1836 | /* | |
1837 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
1838 | */ | |
1839 | if (!strncmp(page, "NULL", 4)) { | |
1a1ff825 | 1840 | ret = vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
1841 | return (!ret) ? count : ret; |
1842 | } | |
1843 | /* | |
1844 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1a1ff825 NB |
1845 | * the fabric protocol_id set in vhost_scsi_make_tport(), and call |
1846 | * vhost_scsi_make_nexus(). | |
057cbf49 | 1847 | */ |
1a1ff825 | 1848 | if (strlen(page) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 1849 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
1a1ff825 | 1850 | " max: %d\n", page, VHOST_SCSI_NAMELEN); |
057cbf49 NB |
1851 | return -EINVAL; |
1852 | } | |
1a1ff825 | 1853 | snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page); |
057cbf49 NB |
1854 | |
1855 | ptr = strstr(i_port, "naa."); | |
1856 | if (ptr) { | |
1857 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
1858 | pr_err("Passed SAS Initiator Port %s does not" | |
1859 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 1860 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
1861 | return -EINVAL; |
1862 | } | |
1863 | port_ptr = &i_port[0]; | |
1864 | goto check_newline; | |
1865 | } | |
1866 | ptr = strstr(i_port, "fc."); | |
1867 | if (ptr) { | |
1868 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
1869 | pr_err("Passed FCP Initiator Port %s does not" | |
1870 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 1871 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
1872 | return -EINVAL; |
1873 | } | |
1874 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1875 | goto check_newline; | |
1876 | } | |
1877 | ptr = strstr(i_port, "iqn."); | |
1878 | if (ptr) { | |
1879 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
1880 | pr_err("Passed iSCSI Initiator Port %s does not" | |
1881 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 1882 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
1883 | return -EINVAL; |
1884 | } | |
1885 | port_ptr = &i_port[0]; | |
1886 | goto check_newline; | |
1887 | } | |
1888 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
1889 | " %s\n", i_port); | |
1890 | return -EINVAL; | |
1891 | /* | |
1892 | * Clear any trailing newline for the NAA WWN | |
1893 | */ | |
1894 | check_newline: | |
1895 | if (i_port[strlen(i_port)-1] == '\n') | |
1896 | i_port[strlen(i_port)-1] = '\0'; | |
1897 | ||
1a1ff825 | 1898 | ret = vhost_scsi_make_nexus(tpg, port_ptr); |
057cbf49 NB |
1899 | if (ret < 0) |
1900 | return ret; | |
1901 | ||
1902 | return count; | |
1903 | } | |
1904 | ||
2eafd729 | 1905 | CONFIGFS_ATTR(vhost_scsi_tpg_, nexus); |
057cbf49 | 1906 | |
1a1ff825 | 1907 | static struct configfs_attribute *vhost_scsi_tpg_attrs[] = { |
2eafd729 | 1908 | &vhost_scsi_tpg_attr_nexus, |
057cbf49 NB |
1909 | NULL, |
1910 | }; | |
1911 | ||
683bd967 | 1912 | static struct se_portal_group * |
1a1ff825 | 1913 | vhost_scsi_make_tpg(struct se_wwn *wwn, |
683bd967 AH |
1914 | struct config_group *group, |
1915 | const char *name) | |
057cbf49 | 1916 | { |
1a1ff825 NB |
1917 | struct vhost_scsi_tport *tport = container_of(wwn, |
1918 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 | 1919 | |
1a1ff825 | 1920 | struct vhost_scsi_tpg *tpg; |
59c816c1 | 1921 | u16 tpgt; |
057cbf49 NB |
1922 | int ret; |
1923 | ||
1924 | if (strstr(name, "tpgt_") != name) | |
1925 | return ERR_PTR(-EINVAL); | |
59c816c1 | 1926 | if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET) |
057cbf49 NB |
1927 | return ERR_PTR(-EINVAL); |
1928 | ||
1a1ff825 | 1929 | tpg = kzalloc(sizeof(struct vhost_scsi_tpg), GFP_KERNEL); |
057cbf49 | 1930 | if (!tpg) { |
1a1ff825 | 1931 | pr_err("Unable to allocate struct vhost_scsi_tpg"); |
057cbf49 NB |
1932 | return ERR_PTR(-ENOMEM); |
1933 | } | |
1934 | mutex_init(&tpg->tv_tpg_mutex); | |
1935 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
1936 | tpg->tport = tport; | |
1937 | tpg->tport_tpgt = tpgt; | |
1938 | ||
bc0c94b1 | 1939 | ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id); |
057cbf49 NB |
1940 | if (ret < 0) { |
1941 | kfree(tpg); | |
1942 | return NULL; | |
1943 | } | |
1a1ff825 NB |
1944 | mutex_lock(&vhost_scsi_mutex); |
1945 | list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list); | |
1946 | mutex_unlock(&vhost_scsi_mutex); | |
057cbf49 NB |
1947 | |
1948 | return &tpg->se_tpg; | |
1949 | } | |
1950 | ||
1a1ff825 | 1951 | static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg) |
057cbf49 | 1952 | { |
1a1ff825 NB |
1953 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1954 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1955 | |
1a1ff825 | 1956 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 1957 | list_del(&tpg->tv_tpg_list); |
1a1ff825 | 1958 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 1959 | /* |
101998f6 | 1960 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 | 1961 | */ |
1a1ff825 | 1962 | vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
1963 | /* |
1964 | * Deregister the se_tpg from TCM.. | |
1965 | */ | |
1966 | core_tpg_deregister(se_tpg); | |
1967 | kfree(tpg); | |
1968 | } | |
1969 | ||
683bd967 | 1970 | static struct se_wwn * |
1a1ff825 | 1971 | vhost_scsi_make_tport(struct target_fabric_configfs *tf, |
683bd967 AH |
1972 | struct config_group *group, |
1973 | const char *name) | |
057cbf49 | 1974 | { |
1a1ff825 | 1975 | struct vhost_scsi_tport *tport; |
057cbf49 NB |
1976 | char *ptr; |
1977 | u64 wwpn = 0; | |
1978 | int off = 0; | |
1979 | ||
1a1ff825 | 1980 | /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0) |
057cbf49 NB |
1981 | return ERR_PTR(-EINVAL); */ |
1982 | ||
1a1ff825 | 1983 | tport = kzalloc(sizeof(struct vhost_scsi_tport), GFP_KERNEL); |
057cbf49 | 1984 | if (!tport) { |
1a1ff825 | 1985 | pr_err("Unable to allocate struct vhost_scsi_tport"); |
057cbf49 NB |
1986 | return ERR_PTR(-ENOMEM); |
1987 | } | |
1988 | tport->tport_wwpn = wwpn; | |
1989 | /* | |
1990 | * Determine the emulated Protocol Identifier and Target Port Name | |
1991 | * based on the incoming configfs directory name. | |
1992 | */ | |
1993 | ptr = strstr(name, "naa."); | |
1994 | if (ptr) { | |
1995 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
1996 | goto check_len; | |
1997 | } | |
1998 | ptr = strstr(name, "fc."); | |
1999 | if (ptr) { | |
2000 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
2001 | off = 3; /* Skip over "fc." */ | |
2002 | goto check_len; | |
2003 | } | |
2004 | ptr = strstr(name, "iqn."); | |
2005 | if (ptr) { | |
2006 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
2007 | goto check_len; | |
2008 | } | |
2009 | ||
2010 | pr_err("Unable to locate prefix for emulated Target Port:" | |
2011 | " %s\n", name); | |
2012 | kfree(tport); | |
2013 | return ERR_PTR(-EINVAL); | |
2014 | ||
2015 | check_len: | |
1a1ff825 | 2016 | if (strlen(name) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2017 | pr_err("Emulated %s Address: %s, exceeds" |
1a1ff825 NB |
2018 | " max: %d\n", name, vhost_scsi_dump_proto_id(tport), |
2019 | VHOST_SCSI_NAMELEN); | |
057cbf49 NB |
2020 | kfree(tport); |
2021 | return ERR_PTR(-EINVAL); | |
2022 | } | |
1a1ff825 | 2023 | snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]); |
057cbf49 NB |
2024 | |
2025 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
1a1ff825 | 2026 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name); |
057cbf49 NB |
2027 | |
2028 | return &tport->tport_wwn; | |
2029 | } | |
2030 | ||
1a1ff825 | 2031 | static void vhost_scsi_drop_tport(struct se_wwn *wwn) |
057cbf49 | 2032 | { |
1a1ff825 NB |
2033 | struct vhost_scsi_tport *tport = container_of(wwn, |
2034 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 NB |
2035 | |
2036 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
1a1ff825 | 2037 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), |
057cbf49 NB |
2038 | tport->tport_name); |
2039 | ||
2040 | kfree(tport); | |
2041 | } | |
2042 | ||
683bd967 | 2043 | static ssize_t |
2eafd729 | 2044 | vhost_scsi_wwn_version_show(struct config_item *item, char *page) |
057cbf49 NB |
2045 | { |
2046 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" | |
1a1ff825 | 2047 | "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 NB |
2048 | utsname()->machine); |
2049 | } | |
2050 | ||
2eafd729 | 2051 | CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version); |
057cbf49 | 2052 | |
1a1ff825 | 2053 | static struct configfs_attribute *vhost_scsi_wwn_attrs[] = { |
2eafd729 | 2054 | &vhost_scsi_wwn_attr_version, |
057cbf49 NB |
2055 | NULL, |
2056 | }; | |
2057 | ||
1d822a40 | 2058 | static const struct target_core_fabric_ops vhost_scsi_ops = { |
9ac8928e CH |
2059 | .module = THIS_MODULE, |
2060 | .name = "vhost", | |
1a1ff825 | 2061 | .get_fabric_name = vhost_scsi_get_fabric_name, |
1a1ff825 NB |
2062 | .tpg_get_wwn = vhost_scsi_get_fabric_wwn, |
2063 | .tpg_get_tag = vhost_scsi_get_tpgt, | |
1a1ff825 NB |
2064 | .tpg_check_demo_mode = vhost_scsi_check_true, |
2065 | .tpg_check_demo_mode_cache = vhost_scsi_check_true, | |
2066 | .tpg_check_demo_mode_write_protect = vhost_scsi_check_false, | |
2067 | .tpg_check_prod_mode_write_protect = vhost_scsi_check_false, | |
b1d75fe5 | 2068 | .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only, |
1a1ff825 NB |
2069 | .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index, |
2070 | .release_cmd = vhost_scsi_release_cmd, | |
084ed45b | 2071 | .check_stop_free = vhost_scsi_check_stop_free, |
1a1ff825 | 2072 | .sess_get_index = vhost_scsi_sess_get_index, |
057cbf49 | 2073 | .sess_get_initiator_sid = NULL, |
1a1ff825 NB |
2074 | .write_pending = vhost_scsi_write_pending, |
2075 | .write_pending_status = vhost_scsi_write_pending_status, | |
2076 | .set_default_node_attributes = vhost_scsi_set_default_node_attrs, | |
1a1ff825 NB |
2077 | .get_cmd_state = vhost_scsi_get_cmd_state, |
2078 | .queue_data_in = vhost_scsi_queue_data_in, | |
2079 | .queue_status = vhost_scsi_queue_status, | |
2080 | .queue_tm_rsp = vhost_scsi_queue_tm_rsp, | |
2081 | .aborted_task = vhost_scsi_aborted_task, | |
057cbf49 NB |
2082 | /* |
2083 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
2084 | */ | |
1a1ff825 NB |
2085 | .fabric_make_wwn = vhost_scsi_make_tport, |
2086 | .fabric_drop_wwn = vhost_scsi_drop_tport, | |
2087 | .fabric_make_tpg = vhost_scsi_make_tpg, | |
2088 | .fabric_drop_tpg = vhost_scsi_drop_tpg, | |
2089 | .fabric_post_link = vhost_scsi_port_link, | |
2090 | .fabric_pre_unlink = vhost_scsi_port_unlink, | |
9ac8928e CH |
2091 | |
2092 | .tfc_wwn_attrs = vhost_scsi_wwn_attrs, | |
2093 | .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs, | |
2094 | .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs, | |
057cbf49 NB |
2095 | }; |
2096 | ||
9ac8928e | 2097 | static int __init vhost_scsi_init(void) |
057cbf49 | 2098 | { |
9ac8928e | 2099 | int ret = -ENOMEM; |
057cbf49 | 2100 | |
9ac8928e | 2101 | pr_debug("TCM_VHOST fabric module %s on %s/%s" |
1a1ff825 | 2102 | " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 | 2103 | utsname()->machine); |
057cbf49 | 2104 | |
101998f6 NB |
2105 | /* |
2106 | * Use our own dedicated workqueue for submitting I/O into | |
2107 | * target core to avoid contention within system_wq. | |
2108 | */ | |
1a1ff825 NB |
2109 | vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0); |
2110 | if (!vhost_scsi_workqueue) | |
057cbf49 NB |
2111 | goto out; |
2112 | ||
2113 | ret = vhost_scsi_register(); | |
2114 | if (ret < 0) | |
2115 | goto out_destroy_workqueue; | |
2116 | ||
9ac8928e | 2117 | ret = target_register_template(&vhost_scsi_ops); |
057cbf49 NB |
2118 | if (ret < 0) |
2119 | goto out_vhost_scsi_deregister; | |
2120 | ||
2121 | return 0; | |
2122 | ||
2123 | out_vhost_scsi_deregister: | |
2124 | vhost_scsi_deregister(); | |
2125 | out_destroy_workqueue: | |
1a1ff825 | 2126 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2127 | out: |
2128 | return ret; | |
2129 | }; | |
2130 | ||
1a1ff825 | 2131 | static void vhost_scsi_exit(void) |
057cbf49 | 2132 | { |
9ac8928e | 2133 | target_unregister_template(&vhost_scsi_ops); |
057cbf49 | 2134 | vhost_scsi_deregister(); |
1a1ff825 | 2135 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2136 | }; |
2137 | ||
181c04a3 MT |
2138 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
2139 | MODULE_ALIAS("tcm_vhost"); | |
057cbf49 | 2140 | MODULE_LICENSE("GPL"); |
1a1ff825 NB |
2141 | module_init(vhost_scsi_init); |
2142 | module_exit(vhost_scsi_exit); |