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23b228cb | 1 | // SPDX-License-Identifier: GPL-2.0+ |
057cbf49 NB |
2 | /******************************************************************************* |
3 | * Vhost kernel TCM fabric driver for virtio SCSI initiators | |
4 | * | |
4c76251e | 5 | * (C) Copyright 2010-2013 Datera, Inc. |
057cbf49 NB |
6 | * (C) Copyright 2010-2012 IBM Corp. |
7 | * | |
4c76251e | 8 | * Authors: Nicholas A. Bellinger <nab@daterainc.com> |
057cbf49 | 9 | * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> |
057cbf49 NB |
10 | ****************************************************************************/ |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/moduleparam.h> | |
14 | #include <generated/utsrelease.h> | |
15 | #include <linux/utsname.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/kthread.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/configfs.h> | |
22 | #include <linux/ctype.h> | |
23 | #include <linux/compat.h> | |
24 | #include <linux/eventfd.h> | |
057cbf49 | 25 | #include <linux/fs.h> |
5538d294 | 26 | #include <linux/vmalloc.h> |
057cbf49 NB |
27 | #include <linux/miscdevice.h> |
28 | #include <asm/unaligned.h> | |
ba929992 BVA |
29 | #include <scsi/scsi_common.h> |
30 | #include <scsi/scsi_proto.h> | |
057cbf49 NB |
31 | #include <target/target_core_base.h> |
32 | #include <target/target_core_fabric.h> | |
057cbf49 | 33 | #include <linux/vhost.h> |
057cbf49 | 34 | #include <linux/virtio_scsi.h> |
9d6064a3 | 35 | #include <linux/llist.h> |
1b7f390e | 36 | #include <linux/bitmap.h> |
057cbf49 | 37 | |
057cbf49 | 38 | #include "vhost.h" |
5012a3a3 | 39 | |
1a1ff825 NB |
40 | #define VHOST_SCSI_VERSION "v0.1" |
41 | #define VHOST_SCSI_NAMELEN 256 | |
42 | #define VHOST_SCSI_MAX_CDB_SIZE 32 | |
1a1ff825 NB |
43 | #define VHOST_SCSI_PREALLOC_SGLS 2048 |
44 | #define VHOST_SCSI_PREALLOC_UPAGES 2048 | |
864d39df | 45 | #define VHOST_SCSI_PREALLOC_PROT_SGLS 2048 |
5012a3a3 | 46 | |
e82b9b07 JW |
47 | /* Max number of requests before requeueing the job. |
48 | * Using this limit prevents one virtqueue from starving others with | |
49 | * request. | |
50 | */ | |
51 | #define VHOST_SCSI_WEIGHT 256 | |
52 | ||
5012a3a3 MT |
53 | struct vhost_scsi_inflight { |
54 | /* Wait for the flush operation to finish */ | |
55 | struct completion comp; | |
56 | /* Refcount for the inflight reqs */ | |
57 | struct kref kref; | |
58 | }; | |
59 | ||
1a1ff825 | 60 | struct vhost_scsi_cmd { |
5012a3a3 MT |
61 | /* Descriptor from vhost_get_vq_desc() for virt_queue segment */ |
62 | int tvc_vq_desc; | |
63 | /* virtio-scsi initiator task attribute */ | |
64 | int tvc_task_attr; | |
79c14141 NB |
65 | /* virtio-scsi response incoming iovecs */ |
66 | int tvc_in_iovs; | |
5012a3a3 MT |
67 | /* virtio-scsi initiator data direction */ |
68 | enum dma_data_direction tvc_data_direction; | |
69 | /* Expected data transfer length from virtio-scsi header */ | |
70 | u32 tvc_exp_data_len; | |
71 | /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */ | |
72 | u64 tvc_tag; | |
73 | /* The number of scatterlists associated with this cmd */ | |
74 | u32 tvc_sgl_count; | |
e31885dd | 75 | u32 tvc_prot_sgl_count; |
6ec29cb8 | 76 | /* Saved unpacked SCSI LUN for vhost_scsi_target_queue_cmd() */ |
5012a3a3 MT |
77 | u32 tvc_lun; |
78 | /* Pointer to the SGL formatted memory from virtio-scsi */ | |
79 | struct scatterlist *tvc_sgl; | |
b1935f68 | 80 | struct scatterlist *tvc_prot_sgl; |
3aee26b4 | 81 | struct page **tvc_upages; |
79c14141 | 82 | /* Pointer to response header iovec */ |
6dd88fd5 | 83 | struct iovec *tvc_resp_iov; |
5012a3a3 MT |
84 | /* Pointer to vhost_scsi for our device */ |
85 | struct vhost_scsi *tvc_vhost; | |
86 | /* Pointer to vhost_virtqueue for the cmd */ | |
87 | struct vhost_virtqueue *tvc_vq; | |
88 | /* Pointer to vhost nexus memory */ | |
1a1ff825 | 89 | struct vhost_scsi_nexus *tvc_nexus; |
5012a3a3 MT |
90 | /* The TCM I/O descriptor that is accessed via container_of() */ |
91 | struct se_cmd tvc_se_cmd; | |
5012a3a3 | 92 | /* Copy of the incoming SCSI command descriptor block (CDB) */ |
1a1ff825 | 93 | unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE]; |
5012a3a3 MT |
94 | /* Sense buffer that will be mapped into outgoing status */ |
95 | unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER]; | |
96 | /* Completed commands list, serviced from vhost worker thread */ | |
97 | struct llist_node tvc_completion_list; | |
98 | /* Used to track inflight cmd */ | |
99 | struct vhost_scsi_inflight *inflight; | |
100 | }; | |
101 | ||
1a1ff825 | 102 | struct vhost_scsi_nexus { |
5012a3a3 MT |
103 | /* Pointer to TCM session for I_T Nexus */ |
104 | struct se_session *tvn_se_sess; | |
105 | }; | |
106 | ||
1a1ff825 | 107 | struct vhost_scsi_tpg { |
5012a3a3 MT |
108 | /* Vhost port target portal group tag for TCM */ |
109 | u16 tport_tpgt; | |
110 | /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */ | |
111 | int tv_tpg_port_count; | |
112 | /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */ | |
113 | int tv_tpg_vhost_count; | |
b1d75fe5 NB |
114 | /* Used for enabling T10-PI with legacy devices */ |
115 | int tv_fabric_prot_type; | |
1a1ff825 | 116 | /* list for vhost_scsi_list */ |
5012a3a3 MT |
117 | struct list_head tv_tpg_list; |
118 | /* Used to protect access for tpg_nexus */ | |
119 | struct mutex tv_tpg_mutex; | |
120 | /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */ | |
1a1ff825 NB |
121 | struct vhost_scsi_nexus *tpg_nexus; |
122 | /* Pointer back to vhost_scsi_tport */ | |
123 | struct vhost_scsi_tport *tport; | |
124 | /* Returned by vhost_scsi_make_tpg() */ | |
5012a3a3 MT |
125 | struct se_portal_group se_tpg; |
126 | /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */ | |
127 | struct vhost_scsi *vhost_scsi; | |
128 | }; | |
129 | ||
1a1ff825 | 130 | struct vhost_scsi_tport { |
5012a3a3 MT |
131 | /* SCSI protocol the tport is providing */ |
132 | u8 tport_proto_id; | |
133 | /* Binary World Wide unique Port Name for Vhost Target port */ | |
134 | u64 tport_wwpn; | |
135 | /* ASCII formatted WWPN for Vhost Target port */ | |
1a1ff825 NB |
136 | char tport_name[VHOST_SCSI_NAMELEN]; |
137 | /* Returned by vhost_scsi_make_tport() */ | |
5012a3a3 MT |
138 | struct se_wwn tport_wwn; |
139 | }; | |
140 | ||
1a1ff825 | 141 | struct vhost_scsi_evt { |
5012a3a3 MT |
142 | /* event to be sent to guest */ |
143 | struct virtio_scsi_event event; | |
144 | /* event list, serviced from vhost worker thread */ | |
145 | struct llist_node list; | |
146 | }; | |
057cbf49 | 147 | |
101998f6 NB |
148 | enum { |
149 | VHOST_SCSI_VQ_CTL = 0, | |
150 | VHOST_SCSI_VQ_EVT = 1, | |
151 | VHOST_SCSI_VQ_IO = 2, | |
152 | }; | |
153 | ||
e72fd72e | 154 | /* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */ |
5dade710 | 155 | enum { |
95e7c434 | 156 | VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) | |
4e9fa50c | 157 | (1ULL << VIRTIO_SCSI_F_T10_PI) |
5dade710 NB |
158 | }; |
159 | ||
1b7f390e | 160 | #define VHOST_SCSI_MAX_TARGET 256 |
f49c2226 | 161 | #define VHOST_SCSI_MAX_IO_VQ 1024 |
a6c9af87 | 162 | #define VHOST_SCSI_MAX_EVENT 128 |
67e18cf9 | 163 | |
f49c2226 MC |
164 | static unsigned vhost_scsi_max_io_vqs = 128; |
165 | module_param_named(max_io_vqs, vhost_scsi_max_io_vqs, uint, 0644); | |
166 | MODULE_PARM_DESC(max_io_vqs, "Set the max number of IO virtqueues a vhost scsi device can support. The default is 128. The max is 1024."); | |
167 | ||
3ab2e420 AH |
168 | struct vhost_scsi_virtqueue { |
169 | struct vhost_virtqueue vq; | |
3dfbff32 MT |
170 | /* |
171 | * Reference counting for inflight reqs, used for flush operation. At | |
172 | * each time, one reference tracks new commands submitted, while we | |
173 | * wait for another one to reach 0. | |
174 | */ | |
f2f0173d | 175 | struct vhost_scsi_inflight inflights[2]; |
3dfbff32 MT |
176 | /* |
177 | * Indicate current inflight in use, protected by vq->mutex. | |
178 | * Writers must also take dev mutex and flush under it. | |
179 | */ | |
f2f0173d | 180 | int inflight_idx; |
25b98b64 MC |
181 | struct vhost_scsi_cmd *scsi_cmds; |
182 | struct sbitmap scsi_tags; | |
183 | int max_cmds; | |
3ab2e420 AH |
184 | }; |
185 | ||
057cbf49 | 186 | struct vhost_scsi { |
67e18cf9 | 187 | /* Protected by vhost_scsi->dev.mutex */ |
1a1ff825 | 188 | struct vhost_scsi_tpg **vs_tpg; |
67e18cf9 | 189 | char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
67e18cf9 | 190 | |
057cbf49 | 191 | struct vhost_dev dev; |
f49c2226 MC |
192 | struct vhost_scsi_virtqueue *vqs; |
193 | unsigned long *compl_bitmap; | |
194 | struct vhost_scsi_inflight **old_inflight; | |
057cbf49 NB |
195 | |
196 | struct vhost_work vs_completion_work; /* cmd completion work item */ | |
9d6064a3 | 197 | struct llist_head vs_completion_list; /* cmd completion queue */ |
a6c9af87 AH |
198 | |
199 | struct vhost_work vs_event_work; /* evt injection work item */ | |
200 | struct llist_head vs_event_list; /* evt injection queue */ | |
201 | ||
202 | bool vs_events_missed; /* any missed events, protected by vq->mutex */ | |
203 | int vs_events_nr; /* num of pending events, protected by vq->mutex */ | |
057cbf49 NB |
204 | }; |
205 | ||
efd838fe MC |
206 | struct vhost_scsi_tmf { |
207 | struct vhost_work vwork; | |
efd838fe MC |
208 | struct vhost_scsi *vhost; |
209 | struct vhost_scsi_virtqueue *svq; | |
efd838fe MC |
210 | |
211 | struct se_cmd se_cmd; | |
b4fffc17 | 212 | u8 scsi_resp; |
efd838fe MC |
213 | struct vhost_scsi_inflight *inflight; |
214 | struct iovec resp_iov; | |
215 | int in_iovs; | |
216 | int vq_desc; | |
217 | }; | |
218 | ||
3f8ca2e1 BM |
219 | /* |
220 | * Context for processing request and control queue operations. | |
221 | */ | |
222 | struct vhost_scsi_ctx { | |
223 | int head; | |
224 | unsigned int out, in; | |
225 | size_t req_size, rsp_size; | |
226 | size_t out_size, in_size; | |
227 | u8 *target, *lunp; | |
228 | void *req; | |
229 | struct iov_iter out_iter; | |
230 | }; | |
231 | ||
bea273c7 MC |
232 | /* |
233 | * Global mutex to protect vhost_scsi TPG list for vhost IOCTLs and LIO | |
234 | * configfs management operations. | |
235 | */ | |
1a1ff825 NB |
236 | static DEFINE_MUTEX(vhost_scsi_mutex); |
237 | static LIST_HEAD(vhost_scsi_list); | |
057cbf49 | 238 | |
1a1ff825 | 239 | static void vhost_scsi_done_inflight(struct kref *kref) |
f2f0173d AH |
240 | { |
241 | struct vhost_scsi_inflight *inflight; | |
242 | ||
243 | inflight = container_of(kref, struct vhost_scsi_inflight, kref); | |
244 | complete(&inflight->comp); | |
245 | } | |
246 | ||
1a1ff825 | 247 | static void vhost_scsi_init_inflight(struct vhost_scsi *vs, |
f2f0173d AH |
248 | struct vhost_scsi_inflight *old_inflight[]) |
249 | { | |
250 | struct vhost_scsi_inflight *new_inflight; | |
251 | struct vhost_virtqueue *vq; | |
252 | int idx, i; | |
253 | ||
f49c2226 | 254 | for (i = 0; i < vs->dev.nvqs; i++) { |
f2f0173d AH |
255 | vq = &vs->vqs[i].vq; |
256 | ||
257 | mutex_lock(&vq->mutex); | |
258 | ||
259 | /* store old infight */ | |
260 | idx = vs->vqs[i].inflight_idx; | |
261 | if (old_inflight) | |
262 | old_inflight[i] = &vs->vqs[i].inflights[idx]; | |
263 | ||
264 | /* setup new infight */ | |
265 | vs->vqs[i].inflight_idx = idx ^ 1; | |
266 | new_inflight = &vs->vqs[i].inflights[idx ^ 1]; | |
267 | kref_init(&new_inflight->kref); | |
268 | init_completion(&new_inflight->comp); | |
269 | ||
270 | mutex_unlock(&vq->mutex); | |
271 | } | |
272 | } | |
273 | ||
274 | static struct vhost_scsi_inflight * | |
1a1ff825 | 275 | vhost_scsi_get_inflight(struct vhost_virtqueue *vq) |
f2f0173d AH |
276 | { |
277 | struct vhost_scsi_inflight *inflight; | |
278 | struct vhost_scsi_virtqueue *svq; | |
279 | ||
280 | svq = container_of(vq, struct vhost_scsi_virtqueue, vq); | |
281 | inflight = &svq->inflights[svq->inflight_idx]; | |
282 | kref_get(&inflight->kref); | |
283 | ||
284 | return inflight; | |
285 | } | |
286 | ||
1a1ff825 | 287 | static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight) |
f2f0173d | 288 | { |
1a1ff825 | 289 | kref_put(&inflight->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
290 | } |
291 | ||
1a1ff825 | 292 | static int vhost_scsi_check_true(struct se_portal_group *se_tpg) |
057cbf49 NB |
293 | { |
294 | return 1; | |
295 | } | |
296 | ||
1a1ff825 | 297 | static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg) |
057cbf49 | 298 | { |
1a1ff825 NB |
299 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
300 | struct vhost_scsi_tpg, se_tpg); | |
301 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
302 | |
303 | return &tport->tport_name[0]; | |
304 | } | |
305 | ||
1a1ff825 | 306 | static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg) |
057cbf49 | 307 | { |
1a1ff825 NB |
308 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
309 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 NB |
310 | return tpg->tport_tpgt; |
311 | } | |
312 | ||
b1d75fe5 NB |
313 | static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg) |
314 | { | |
315 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, | |
316 | struct vhost_scsi_tpg, se_tpg); | |
317 | ||
318 | return tpg->tv_fabric_prot_type; | |
319 | } | |
320 | ||
47a3565e | 321 | static void vhost_scsi_release_cmd_res(struct se_cmd *se_cmd) |
057cbf49 | 322 | { |
1a1ff825 NB |
323 | struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd, |
324 | struct vhost_scsi_cmd, tvc_se_cmd); | |
25b98b64 MC |
325 | struct vhost_scsi_virtqueue *svq = container_of(tv_cmd->tvc_vq, |
326 | struct vhost_scsi_virtqueue, vq); | |
327 | struct vhost_scsi_inflight *inflight = tv_cmd->inflight; | |
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 | |
25b98b64 MC |
339 | sbitmap_clear_bit(&svq->scsi_tags, se_cmd->map_tag); |
340 | vhost_scsi_put_inflight(inflight); | |
057cbf49 NB |
341 | } |
342 | ||
efd838fe MC |
343 | static void vhost_scsi_release_tmf_res(struct vhost_scsi_tmf *tmf) |
344 | { | |
efd838fe MC |
345 | struct vhost_scsi_inflight *inflight = tmf->inflight; |
346 | ||
4c363c81 | 347 | kfree(tmf); |
efd838fe MC |
348 | vhost_scsi_put_inflight(inflight); |
349 | } | |
350 | ||
47a3565e MC |
351 | static void vhost_scsi_release_cmd(struct se_cmd *se_cmd) |
352 | { | |
efd838fe MC |
353 | if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) { |
354 | struct vhost_scsi_tmf *tmf = container_of(se_cmd, | |
355 | struct vhost_scsi_tmf, se_cmd); | |
356 | ||
357 | vhost_work_queue(&tmf->vhost->dev, &tmf->vwork); | |
358 | } else { | |
359 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, | |
47a3565e | 360 | struct vhost_scsi_cmd, tvc_se_cmd); |
efd838fe | 361 | struct vhost_scsi *vs = cmd->tvc_vhost; |
47a3565e | 362 | |
efd838fe MC |
363 | llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
364 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
365 | } | |
47a3565e MC |
366 | } |
367 | ||
1a1ff825 | 368 | static int vhost_scsi_write_pending(struct se_cmd *se_cmd) |
057cbf49 NB |
369 | { |
370 | /* Go ahead and process the write immediately */ | |
371 | target_execute_cmd(se_cmd); | |
372 | return 0; | |
373 | } | |
374 | ||
1a1ff825 | 375 | static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd) |
057cbf49 | 376 | { |
47a3565e | 377 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 NB |
378 | return 0; |
379 | } | |
380 | ||
1a1ff825 | 381 | static int vhost_scsi_queue_status(struct se_cmd *se_cmd) |
057cbf49 | 382 | { |
47a3565e | 383 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 NB |
384 | return 0; |
385 | } | |
386 | ||
1a1ff825 | 387 | static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd) |
057cbf49 | 388 | { |
efd838fe MC |
389 | struct vhost_scsi_tmf *tmf = container_of(se_cmd, struct vhost_scsi_tmf, |
390 | se_cmd); | |
391 | ||
b4fffc17 | 392 | tmf->scsi_resp = se_cmd->se_tmr_req->response; |
efd838fe | 393 | transport_generic_free_cmd(&tmf->se_cmd, 0); |
057cbf49 NB |
394 | } |
395 | ||
1a1ff825 | 396 | static void vhost_scsi_aborted_task(struct se_cmd *se_cmd) |
131e6abc NB |
397 | { |
398 | return; | |
399 | } | |
400 | ||
1a1ff825 | 401 | static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 AH |
402 | { |
403 | vs->vs_events_nr--; | |
404 | kfree(evt); | |
405 | } | |
406 | ||
1a1ff825 NB |
407 | static struct vhost_scsi_evt * |
408 | vhost_scsi_allocate_evt(struct vhost_scsi *vs, | |
683bd967 | 409 | u32 event, u32 reason) |
a6c9af87 | 410 | { |
3ab2e420 | 411 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
1a1ff825 | 412 | struct vhost_scsi_evt *evt; |
a6c9af87 AH |
413 | |
414 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
415 | vs->vs_events_missed = true; | |
416 | return NULL; | |
417 | } | |
418 | ||
419 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
420 | if (!evt) { | |
1a1ff825 | 421 | vq_err(vq, "Failed to allocate vhost_scsi_evt\n"); |
a6c9af87 AH |
422 | vs->vs_events_missed = true; |
423 | return NULL; | |
424 | } | |
425 | ||
e72fd72e MT |
426 | evt->event.event = cpu_to_vhost32(vq, event); |
427 | evt->event.reason = cpu_to_vhost32(vq, reason); | |
a6c9af87 AH |
428 | vs->vs_events_nr++; |
429 | ||
430 | return evt; | |
431 | } | |
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 | ||
247643f8 | 447 | if (!vhost_vq_get_backend(vq)) { |
a6c9af87 AH |
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); | |
9d6064a3 | 514 | struct virtio_scsi_cmd_resp v_rsp; |
816e85ed | 515 | struct vhost_scsi_cmd *cmd, *t; |
9d6064a3 AH |
516 | struct llist_node *llnode; |
517 | struct se_cmd *se_cmd; | |
79c14141 | 518 | struct iov_iter iov_iter; |
1b7f390e | 519 | int ret, vq; |
057cbf49 | 520 | |
f49c2226 | 521 | bitmap_zero(vs->compl_bitmap, vs->dev.nvqs); |
9d6064a3 | 522 | llnode = llist_del_all(&vs->vs_completion_list); |
816e85ed | 523 | llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) { |
3c63f66a | 524 | se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
525 | |
526 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
3c63f66a | 527 | cmd, se_cmd->residual_count, se_cmd->scsi_status); |
057cbf49 NB |
528 | |
529 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
e72fd72e | 530 | v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count); |
057cbf49 NB |
531 | /* TODO is status_qualifier field needed? */ |
532 | v_rsp.status = se_cmd->scsi_status; | |
e72fd72e MT |
533 | v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq, |
534 | se_cmd->scsi_sense_length); | |
3c63f66a | 535 | memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
e72fd72e | 536 | se_cmd->scsi_sense_length); |
79c14141 | 537 | |
6dd88fd5 | 538 | iov_iter_init(&iov_iter, ITER_DEST, cmd->tvc_resp_iov, |
79c14141 NB |
539 | cmd->tvc_in_iovs, sizeof(v_rsp)); |
540 | ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter); | |
541 | if (likely(ret == sizeof(v_rsp))) { | |
3ab2e420 | 542 | struct vhost_scsi_virtqueue *q; |
3c63f66a AH |
543 | vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
544 | q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); | |
3ab2e420 | 545 | vq = q - vs->vqs; |
f49c2226 | 546 | __set_bit(vq, vs->compl_bitmap); |
1b7f390e | 547 | } else |
057cbf49 NB |
548 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
549 | ||
47a3565e | 550 | vhost_scsi_release_cmd_res(se_cmd); |
057cbf49 NB |
551 | } |
552 | ||
1b7f390e | 553 | vq = -1; |
f49c2226 MC |
554 | while ((vq = find_next_bit(vs->compl_bitmap, vs->dev.nvqs, vq + 1)) |
555 | < vs->dev.nvqs) | |
3ab2e420 | 556 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
557 | } |
558 | ||
1a1ff825 | 559 | static struct vhost_scsi_cmd * |
25b98b64 | 560 | vhost_scsi_get_cmd(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg, |
95e7c434 NB |
561 | unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr, |
562 | u32 exp_data_len, int data_direction) | |
057cbf49 | 563 | { |
25b98b64 MC |
564 | struct vhost_scsi_virtqueue *svq = container_of(vq, |
565 | struct vhost_scsi_virtqueue, vq); | |
1a1ff825 NB |
566 | struct vhost_scsi_cmd *cmd; |
567 | struct vhost_scsi_nexus *tv_nexus; | |
b1935f68 | 568 | struct scatterlist *sg, *prot_sg; |
6dd88fd5 | 569 | struct iovec *tvc_resp_iov; |
3aee26b4 | 570 | struct page **pages; |
25b98b64 | 571 | int tag; |
057cbf49 | 572 | |
98718312 | 573 | tv_nexus = tpg->tpg_nexus; |
057cbf49 | 574 | if (!tv_nexus) { |
1a1ff825 | 575 | pr_err("Unable to locate active struct vhost_scsi_nexus\n"); |
057cbf49 NB |
576 | return ERR_PTR(-EIO); |
577 | } | |
057cbf49 | 578 | |
c548e62b | 579 | tag = sbitmap_get(&svq->scsi_tags); |
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 | ||
25b98b64 | 585 | cmd = &svq->scsi_cmds[tag]; |
3aee26b4 | 586 | sg = cmd->tvc_sgl; |
b1935f68 | 587 | prot_sg = cmd->tvc_prot_sgl; |
3aee26b4 | 588 | pages = cmd->tvc_upages; |
6dd88fd5 | 589 | tvc_resp_iov = cmd->tvc_resp_iov; |
473f0b15 | 590 | memset(cmd, 0, sizeof(*cmd)); |
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); |
6dd88fd5 | 602 | cmd->tvc_resp_iov = tvc_resp_iov; |
3c63f66a | 603 | |
1a1ff825 | 604 | memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE); |
95e7c434 | 605 | |
3c63f66a | 606 | return cmd; |
057cbf49 NB |
607 | } |
608 | ||
609 | /* | |
610 | * Map a user memory range into a scatterlist | |
611 | * | |
612 | * Returns the number of scatterlist entries used or -errno on error. | |
613 | */ | |
683bd967 | 614 | static int |
1a1ff825 | 615 | vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd, |
2f240c4a | 616 | struct iov_iter *iter, |
3aee26b4 | 617 | struct scatterlist *sgl, |
5a01d082 | 618 | bool write) |
057cbf49 | 619 | { |
b4078b5f | 620 | struct page **pages = cmd->tvc_upages; |
2f240c4a AV |
621 | struct scatterlist *sg = sgl; |
622 | ssize_t bytes; | |
623 | size_t offset; | |
624 | unsigned int npages = 0; | |
3aee26b4 | 625 | |
1ef255e2 | 626 | bytes = iov_iter_get_pages2(iter, pages, LONG_MAX, |
2f240c4a | 627 | VHOST_SCSI_PREALLOC_UPAGES, &offset); |
1810053e | 628 | /* No pages were pinned */ |
2f240c4a AV |
629 | if (bytes <= 0) |
630 | return bytes < 0 ? bytes : -EFAULT; | |
1810053e | 631 | |
2f240c4a AV |
632 | while (bytes) { |
633 | unsigned n = min_t(unsigned, PAGE_SIZE - offset, bytes); | |
634 | sg_set_page(sg++, pages[npages++], n, offset); | |
635 | bytes -= n; | |
636 | offset = 0; | |
637 | } | |
638 | return npages; | |
057cbf49 NB |
639 | } |
640 | ||
683bd967 | 641 | static int |
e8de56b5 | 642 | vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls) |
057cbf49 | 643 | { |
e8de56b5 | 644 | int sgl_count = 0; |
057cbf49 | 645 | |
de4f5fed | 646 | if (!iter || !iter_iov(iter)) { |
e8de56b5 NB |
647 | pr_err("%s: iter->iov is NULL, but expected bytes: %zu" |
648 | " present\n", __func__, bytes); | |
649 | return -EINVAL; | |
650 | } | |
f3158f36 | 651 | |
e8de56b5 NB |
652 | sgl_count = iov_iter_npages(iter, 0xffff); |
653 | if (sgl_count > max_sgls) { | |
654 | pr_err("%s: requested sgl_count: %d exceeds pre-allocated" | |
655 | " max_sgls: %d\n", __func__, sgl_count, max_sgls); | |
656 | return -EINVAL; | |
5a01d082 | 657 | } |
e8de56b5 NB |
658 | return sgl_count; |
659 | } | |
057cbf49 | 660 | |
e8de56b5 | 661 | static int |
1a1ff825 NB |
662 | vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write, |
663 | struct iov_iter *iter, | |
664 | struct scatterlist *sg, int sg_count) | |
e8de56b5 | 665 | { |
11d49e9d | 666 | struct scatterlist *p = sg; |
2f240c4a | 667 | int ret; |
5a01d082 | 668 | |
2f240c4a AV |
669 | while (iov_iter_count(iter)) { |
670 | ret = vhost_scsi_map_to_sgl(cmd, iter, sg, write); | |
057cbf49 | 671 | if (ret < 0) { |
11d49e9d AV |
672 | while (p < sg) { |
673 | struct page *page = sg_page(p++); | |
e8de56b5 NB |
674 | if (page) |
675 | put_page(page); | |
676 | } | |
057cbf49 NB |
677 | return ret; |
678 | } | |
057cbf49 | 679 | sg += ret; |
057cbf49 NB |
680 | } |
681 | return 0; | |
682 | } | |
683 | ||
e31885dd | 684 | static int |
1a1ff825 | 685 | vhost_scsi_mapal(struct vhost_scsi_cmd *cmd, |
e8de56b5 NB |
686 | size_t prot_bytes, struct iov_iter *prot_iter, |
687 | size_t data_bytes, struct iov_iter *data_iter) | |
688 | { | |
689 | int sgl_count, ret; | |
690 | bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE); | |
691 | ||
692 | if (prot_bytes) { | |
693 | sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes, | |
1a1ff825 | 694 | VHOST_SCSI_PREALLOC_PROT_SGLS); |
e8de56b5 NB |
695 | if (sgl_count < 0) |
696 | return sgl_count; | |
697 | ||
698 | sg_init_table(cmd->tvc_prot_sgl, sgl_count); | |
699 | cmd->tvc_prot_sgl_count = sgl_count; | |
700 | pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__, | |
701 | cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count); | |
702 | ||
703 | ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter, | |
704 | cmd->tvc_prot_sgl, | |
705 | cmd->tvc_prot_sgl_count); | |
e31885dd | 706 | if (ret < 0) { |
e31885dd NB |
707 | cmd->tvc_prot_sgl_count = 0; |
708 | return ret; | |
709 | } | |
e8de56b5 NB |
710 | } |
711 | sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes, | |
1a1ff825 | 712 | VHOST_SCSI_PREALLOC_SGLS); |
e8de56b5 NB |
713 | if (sgl_count < 0) |
714 | return sgl_count; | |
715 | ||
716 | sg_init_table(cmd->tvc_sgl, sgl_count); | |
717 | cmd->tvc_sgl_count = sgl_count; | |
718 | pr_debug("%s data_sg %p data_sgl_count %u\n", __func__, | |
719 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
720 | ||
721 | ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter, | |
722 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
723 | if (ret < 0) { | |
724 | cmd->tvc_sgl_count = 0; | |
725 | return ret; | |
e31885dd NB |
726 | } |
727 | return 0; | |
728 | } | |
729 | ||
46243860 NB |
730 | static int vhost_scsi_to_tcm_attr(int attr) |
731 | { | |
732 | switch (attr) { | |
733 | case VIRTIO_SCSI_S_SIMPLE: | |
734 | return TCM_SIMPLE_TAG; | |
735 | case VIRTIO_SCSI_S_ORDERED: | |
736 | return TCM_ORDERED_TAG; | |
737 | case VIRTIO_SCSI_S_HEAD: | |
738 | return TCM_HEAD_TAG; | |
739 | case VIRTIO_SCSI_S_ACA: | |
740 | return TCM_ACA_TAG; | |
741 | default: | |
742 | break; | |
743 | } | |
744 | return TCM_SIMPLE_TAG; | |
745 | } | |
746 | ||
6ec29cb8 | 747 | static void vhost_scsi_target_queue_cmd(struct vhost_scsi_cmd *cmd) |
057cbf49 | 748 | { |
3c63f66a | 749 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
6ec29cb8 | 750 | struct vhost_scsi_nexus *tv_nexus; |
95e7c434 | 751 | struct scatterlist *sg_ptr, *sg_prot_ptr = NULL; |
057cbf49 | 752 | |
95e7c434 | 753 | /* FIXME: BIDI operation */ |
3c63f66a AH |
754 | if (cmd->tvc_sgl_count) { |
755 | sg_ptr = cmd->tvc_sgl; | |
95e7c434 NB |
756 | |
757 | if (cmd->tvc_prot_sgl_count) | |
758 | sg_prot_ptr = cmd->tvc_prot_sgl; | |
759 | else | |
760 | se_cmd->prot_pto = true; | |
057cbf49 NB |
761 | } else { |
762 | sg_ptr = NULL; | |
763 | } | |
3c63f66a | 764 | tv_nexus = cmd->tvc_nexus; |
9f0abc15 | 765 | |
649ee054 | 766 | se_cmd->tag = 0; |
eb929804 | 767 | target_init_cmd(se_cmd, tv_nexus->tvn_se_sess, &cmd->tvc_sense_buf[0], |
3c63f66a | 768 | cmd->tvc_lun, cmd->tvc_exp_data_len, |
46243860 | 769 | vhost_scsi_to_tcm_attr(cmd->tvc_task_attr), |
eb929804 MC |
770 | cmd->tvc_data_direction, TARGET_SCF_ACK_KREF); |
771 | ||
772 | if (target_submit_prep(se_cmd, cmd->tvc_cdb, sg_ptr, | |
773 | cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr, | |
08694199 | 774 | cmd->tvc_prot_sgl_count, GFP_KERNEL)) |
eb929804 MC |
775 | return; |
776 | ||
6ec29cb8 | 777 | target_queue_submission(se_cmd); |
057cbf49 NB |
778 | } |
779 | ||
683bd967 AH |
780 | static void |
781 | vhost_scsi_send_bad_target(struct vhost_scsi *vs, | |
782 | struct vhost_virtqueue *vq, | |
783 | int head, unsigned out) | |
637ab21e AH |
784 | { |
785 | struct virtio_scsi_cmd_resp __user *resp; | |
786 | struct virtio_scsi_cmd_resp rsp; | |
787 | int ret; | |
788 | ||
789 | memset(&rsp, 0, sizeof(rsp)); | |
790 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
791 | resp = vq->iov[out].iov_base; | |
792 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
793 | if (!ret) | |
794 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
795 | else | |
796 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
797 | } | |
798 | ||
09d75832 BM |
799 | static int |
800 | vhost_scsi_get_desc(struct vhost_scsi *vs, struct vhost_virtqueue *vq, | |
801 | struct vhost_scsi_ctx *vc) | |
802 | { | |
803 | int ret = -ENXIO; | |
804 | ||
805 | vc->head = vhost_get_vq_desc(vq, vq->iov, | |
806 | ARRAY_SIZE(vq->iov), &vc->out, &vc->in, | |
807 | NULL, NULL); | |
808 | ||
809 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", | |
810 | vc->head, vc->out, vc->in); | |
811 | ||
812 | /* On error, stop handling until the next kick. */ | |
813 | if (unlikely(vc->head < 0)) | |
814 | goto done; | |
815 | ||
816 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
817 | if (vc->head == vq->num) { | |
818 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
819 | vhost_disable_notify(&vs->dev, vq); | |
820 | ret = -EAGAIN; | |
821 | } | |
822 | goto done; | |
823 | } | |
824 | ||
825 | /* | |
826 | * Get the size of request and response buffers. | |
827 | * FIXME: Not correct for BIDI operation | |
828 | */ | |
829 | vc->out_size = iov_length(vq->iov, vc->out); | |
830 | vc->in_size = iov_length(&vq->iov[vc->out], vc->in); | |
831 | ||
832 | /* | |
833 | * Copy over the virtio-scsi request header, which for a | |
834 | * ANY_LAYOUT enabled guest may span multiple iovecs, or a | |
835 | * single iovec may contain both the header + outgoing | |
836 | * WRITE payloads. | |
837 | * | |
838 | * copy_from_iter() will advance out_iter, so that it will | |
839 | * point at the start of the outgoing WRITE payload, if | |
840 | * DMA_TO_DEVICE is set. | |
841 | */ | |
de4eda9d | 842 | iov_iter_init(&vc->out_iter, ITER_SOURCE, vq->iov, vc->out, vc->out_size); |
09d75832 BM |
843 | ret = 0; |
844 | ||
845 | done: | |
846 | return ret; | |
847 | } | |
848 | ||
849 | static int | |
850 | vhost_scsi_chk_size(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc) | |
851 | { | |
852 | if (unlikely(vc->in_size < vc->rsp_size)) { | |
853 | vq_err(vq, | |
854 | "Response buf too small, need min %zu bytes got %zu", | |
855 | vc->rsp_size, vc->in_size); | |
856 | return -EINVAL; | |
857 | } else if (unlikely(vc->out_size < vc->req_size)) { | |
858 | vq_err(vq, | |
859 | "Request buf too small, need min %zu bytes got %zu", | |
860 | vc->req_size, vc->out_size); | |
861 | return -EIO; | |
862 | } | |
863 | ||
864 | return 0; | |
865 | } | |
866 | ||
867 | static int | |
868 | vhost_scsi_get_req(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc, | |
869 | struct vhost_scsi_tpg **tpgp) | |
870 | { | |
871 | int ret = -EIO; | |
872 | ||
873 | if (unlikely(!copy_from_iter_full(vc->req, vc->req_size, | |
874 | &vc->out_iter))) { | |
a691ffb4 | 875 | vq_err(vq, "Faulted on copy_from_iter_full\n"); |
09d75832 BM |
876 | } else if (unlikely(*vc->lunp != 1)) { |
877 | /* virtio-scsi spec requires byte 0 of the lun to be 1 */ | |
878 | vq_err(vq, "Illegal virtio-scsi lun: %u\n", *vc->lunp); | |
879 | } else { | |
880 | struct vhost_scsi_tpg **vs_tpg, *tpg; | |
881 | ||
247643f8 | 882 | vs_tpg = vhost_vq_get_backend(vq); /* validated at handler entry */ |
09d75832 BM |
883 | |
884 | tpg = READ_ONCE(vs_tpg[*vc->target]); | |
885 | if (unlikely(!tpg)) { | |
886 | vq_err(vq, "Target 0x%x does not exist\n", *vc->target); | |
887 | } else { | |
888 | if (tpgp) | |
889 | *tpgp = tpg; | |
890 | ret = 0; | |
891 | } | |
892 | } | |
893 | ||
894 | return ret; | |
895 | } | |
896 | ||
18f1becb MC |
897 | static u16 vhost_buf_to_lun(u8 *lun_buf) |
898 | { | |
899 | return ((lun_buf[2] << 8) | lun_buf[3]) & 0x3FFF; | |
900 | } | |
901 | ||
683bd967 AH |
902 | static void |
903 | vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
057cbf49 | 904 | { |
1a1ff825 | 905 | struct vhost_scsi_tpg **vs_tpg, *tpg; |
057cbf49 | 906 | struct virtio_scsi_cmd_req v_req; |
95e7c434 | 907 | struct virtio_scsi_cmd_req_pi v_req_pi; |
09d75832 | 908 | struct vhost_scsi_ctx vc; |
1a1ff825 | 909 | struct vhost_scsi_cmd *cmd; |
09d75832 | 910 | struct iov_iter in_iter, prot_iter, data_iter; |
95e7c434 | 911 | u64 tag; |
09b13fa8 | 912 | u32 exp_data_len, data_direction; |
6dd88fd5 | 913 | int ret, prot_bytes, i, c = 0; |
95e7c434 | 914 | u16 lun; |
09d75832 | 915 | u8 task_attr; |
09b13fa8 | 916 | bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI); |
09d75832 | 917 | void *cdb; |
057cbf49 | 918 | |
e7802212 | 919 | mutex_lock(&vq->mutex); |
4f7f46d3 AH |
920 | /* |
921 | * We can handle the vq only after the endpoint is setup by calling the | |
922 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
4f7f46d3 | 923 | */ |
247643f8 | 924 | vs_tpg = vhost_vq_get_backend(vq); |
4f7f46d3 | 925 | if (!vs_tpg) |
e7802212 | 926 | goto out; |
057cbf49 | 927 | |
09d75832 BM |
928 | memset(&vc, 0, sizeof(vc)); |
929 | vc.rsp_size = sizeof(struct virtio_scsi_cmd_resp); | |
930 | ||
057cbf49 NB |
931 | vhost_disable_notify(&vs->dev, vq); |
932 | ||
c1ea02f1 | 933 | do { |
09d75832 BM |
934 | ret = vhost_scsi_get_desc(vs, vq, &vc); |
935 | if (ret) | |
936 | goto err; | |
937 | ||
09b13fa8 NB |
938 | /* |
939 | * Setup pointers and values based upon different virtio-scsi | |
940 | * request header if T10_PI is enabled in KVM guest. | |
941 | */ | |
942 | if (t10_pi) { | |
09d75832 BM |
943 | vc.req = &v_req_pi; |
944 | vc.req_size = sizeof(v_req_pi); | |
945 | vc.lunp = &v_req_pi.lun[0]; | |
946 | vc.target = &v_req_pi.lun[1]; | |
95e7c434 | 947 | } else { |
09d75832 BM |
948 | vc.req = &v_req; |
949 | vc.req_size = sizeof(v_req); | |
950 | vc.lunp = &v_req.lun[0]; | |
951 | vc.target = &v_req.lun[1]; | |
95e7c434 NB |
952 | } |
953 | ||
09b13fa8 | 954 | /* |
09d75832 BM |
955 | * Validate the size of request and response buffers. |
956 | * Check for a sane response buffer so we can report | |
957 | * early errors back to the guest. | |
09b13fa8 | 958 | */ |
09d75832 BM |
959 | ret = vhost_scsi_chk_size(vq, &vc); |
960 | if (ret) | |
961 | goto err; | |
057cbf49 | 962 | |
09d75832 BM |
963 | ret = vhost_scsi_get_req(vq, &vc, &tpg); |
964 | if (ret) | |
965 | goto err; | |
966 | ||
967 | ret = -EIO; /* bad target on any error from here on */ | |
7fe412d0 | 968 | |
95e7c434 | 969 | /* |
09b13fa8 NB |
970 | * Determine data_direction by calculating the total outgoing |
971 | * iovec sizes + incoming iovec sizes vs. virtio-scsi request + | |
972 | * response headers respectively. | |
95e7c434 | 973 | * |
09b13fa8 NB |
974 | * For DMA_TO_DEVICE this is out_iter, which is already pointing |
975 | * to the right place. | |
976 | * | |
977 | * For DMA_FROM_DEVICE, the iovec will be just past the end | |
978 | * of the virtio-scsi response header in either the same | |
979 | * or immediately following iovec. | |
95e7c434 | 980 | * |
09b13fa8 NB |
981 | * Any associated T10_PI bytes for the outgoing / incoming |
982 | * payloads are included in calculation of exp_data_len here. | |
95e7c434 | 983 | */ |
09b13fa8 NB |
984 | prot_bytes = 0; |
985 | ||
09d75832 | 986 | if (vc.out_size > vc.req_size) { |
09b13fa8 | 987 | data_direction = DMA_TO_DEVICE; |
09d75832 BM |
988 | exp_data_len = vc.out_size - vc.req_size; |
989 | data_iter = vc.out_iter; | |
990 | } else if (vc.in_size > vc.rsp_size) { | |
09b13fa8 | 991 | data_direction = DMA_FROM_DEVICE; |
09d75832 | 992 | exp_data_len = vc.in_size - vc.rsp_size; |
09b13fa8 | 993 | |
de4eda9d | 994 | iov_iter_init(&in_iter, ITER_DEST, &vq->iov[vc.out], vc.in, |
09d75832 BM |
995 | vc.rsp_size + exp_data_len); |
996 | iov_iter_advance(&in_iter, vc.rsp_size); | |
09b13fa8 NB |
997 | data_iter = in_iter; |
998 | } else { | |
999 | data_direction = DMA_NONE; | |
1000 | exp_data_len = 0; | |
1001 | } | |
1002 | /* | |
1003 | * If T10_PI header + payload is present, setup prot_iter values | |
1004 | * and recalculate data_iter for vhost_scsi_mapal() mapping to | |
1005 | * host scatterlists via get_user_pages_fast(). | |
95e7c434 | 1006 | */ |
09b13fa8 | 1007 | if (t10_pi) { |
95e7c434 NB |
1008 | if (v_req_pi.pi_bytesout) { |
1009 | if (data_direction != DMA_TO_DEVICE) { | |
09b13fa8 NB |
1010 | vq_err(vq, "Received non zero pi_bytesout," |
1011 | " but wrong data_direction\n"); | |
09d75832 | 1012 | goto err; |
95e7c434 | 1013 | } |
e72fd72e | 1014 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout); |
95e7c434 NB |
1015 | } else if (v_req_pi.pi_bytesin) { |
1016 | if (data_direction != DMA_FROM_DEVICE) { | |
09b13fa8 NB |
1017 | vq_err(vq, "Received non zero pi_bytesin," |
1018 | " but wrong data_direction\n"); | |
09d75832 | 1019 | goto err; |
95e7c434 | 1020 | } |
e72fd72e | 1021 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin); |
95e7c434 | 1022 | } |
09b13fa8 | 1023 | /* |
4542d623 GE |
1024 | * Set prot_iter to data_iter and truncate it to |
1025 | * prot_bytes, and advance data_iter past any | |
09b13fa8 NB |
1026 | * preceeding prot_bytes that may be present. |
1027 | * | |
1028 | * Also fix up the exp_data_len to reflect only the | |
1029 | * actual data payload length. | |
1030 | */ | |
95e7c434 | 1031 | if (prot_bytes) { |
09b13fa8 NB |
1032 | exp_data_len -= prot_bytes; |
1033 | prot_iter = data_iter; | |
4542d623 | 1034 | iov_iter_truncate(&prot_iter, prot_bytes); |
09b13fa8 | 1035 | iov_iter_advance(&data_iter, prot_bytes); |
95e7c434 | 1036 | } |
e72fd72e | 1037 | tag = vhost64_to_cpu(vq, v_req_pi.tag); |
95e7c434 NB |
1038 | task_attr = v_req_pi.task_attr; |
1039 | cdb = &v_req_pi.cdb[0]; | |
18f1becb | 1040 | lun = vhost_buf_to_lun(v_req_pi.lun); |
95e7c434 | 1041 | } else { |
e72fd72e | 1042 | tag = vhost64_to_cpu(vq, v_req.tag); |
95e7c434 NB |
1043 | task_attr = v_req.task_attr; |
1044 | cdb = &v_req.cdb[0]; | |
18f1becb | 1045 | lun = vhost_buf_to_lun(v_req.lun); |
95e7c434 | 1046 | } |
95e7c434 | 1047 | /* |
09b13fa8 NB |
1048 | * Check that the received CDB size does not exceeded our |
1049 | * hardcoded max for vhost-scsi, then get a pre-allocated | |
1050 | * cmd descriptor for the new virtio-scsi tag. | |
95e7c434 NB |
1051 | * |
1052 | * TODO what if cdb was too small for varlen cdb header? | |
1053 | */ | |
1a1ff825 | 1054 | if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) { |
95e7c434 NB |
1055 | vq_err(vq, "Received SCSI CDB with command_size: %d that" |
1056 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
1a1ff825 | 1057 | scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE); |
09d75832 | 1058 | goto err; |
95e7c434 | 1059 | } |
25b98b64 | 1060 | cmd = vhost_scsi_get_cmd(vq, tpg, cdb, tag, lun, task_attr, |
9f977ef7 NB |
1061 | exp_data_len + prot_bytes, |
1062 | data_direction); | |
3c63f66a | 1063 | if (IS_ERR(cmd)) { |
25b98b64 | 1064 | vq_err(vq, "vhost_scsi_get_cmd failed %ld\n", |
09b13fa8 | 1065 | PTR_ERR(cmd)); |
09d75832 | 1066 | goto err; |
057cbf49 | 1067 | } |
3c63f66a AH |
1068 | cmd->tvc_vhost = vs; |
1069 | cmd->tvc_vq = vq; | |
6dd88fd5 JW |
1070 | for (i = 0; i < vc.in ; i++) |
1071 | cmd->tvc_resp_iov[i] = vq->iov[vc.out + i]; | |
09d75832 | 1072 | cmd->tvc_in_iovs = vc.in; |
057cbf49 | 1073 | |
057cbf49 | 1074 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", |
09b13fa8 NB |
1075 | cmd->tvc_cdb[0], cmd->tvc_lun); |
1076 | pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:" | |
1077 | " %d\n", cmd, exp_data_len, prot_bytes, data_direction); | |
057cbf49 NB |
1078 | |
1079 | if (data_direction != DMA_NONE) { | |
09d75832 BM |
1080 | if (unlikely(vhost_scsi_mapal(cmd, prot_bytes, |
1081 | &prot_iter, exp_data_len, | |
1082 | &data_iter))) { | |
057cbf49 | 1083 | vq_err(vq, "Failed to map iov to sgl\n"); |
47a3565e | 1084 | vhost_scsi_release_cmd_res(&cmd->tvc_se_cmd); |
09d75832 | 1085 | goto err; |
057cbf49 NB |
1086 | } |
1087 | } | |
057cbf49 NB |
1088 | /* |
1089 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
1090 | * complete the virtio-scsi request in TCM callback context via | |
09b13fa8 | 1091 | * vhost_scsi_queue_data_in() and vhost_scsi_queue_status() |
057cbf49 | 1092 | */ |
09d75832 | 1093 | cmd->tvc_vq_desc = vc.head; |
6ec29cb8 | 1094 | vhost_scsi_target_queue_cmd(cmd); |
09d75832 BM |
1095 | ret = 0; |
1096 | err: | |
1097 | /* | |
1098 | * ENXIO: No more requests, or read error, wait for next kick | |
1099 | * EINVAL: Invalid response buffer, drop the request | |
1100 | * EIO: Respond with bad target | |
1101 | * EAGAIN: Pending request | |
1102 | */ | |
1103 | if (ret == -ENXIO) | |
1104 | break; | |
1105 | else if (ret == -EIO) | |
1106 | vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out); | |
c1ea02f1 | 1107 | } while (likely(!vhost_exceeds_weight(vq, ++c, 0))); |
e7802212 | 1108 | out: |
7ea206cf | 1109 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
1110 | } |
1111 | ||
0d02dbd6 | 1112 | static void |
efd838fe MC |
1113 | vhost_scsi_send_tmf_resp(struct vhost_scsi *vs, struct vhost_virtqueue *vq, |
1114 | int in_iovs, int vq_desc, struct iovec *resp_iov, | |
1115 | int tmf_resp_code) | |
0d02dbd6 | 1116 | { |
0d02dbd6 | 1117 | struct virtio_scsi_ctrl_tmf_resp rsp; |
8e5dadfe | 1118 | struct iov_iter iov_iter; |
0d02dbd6 BM |
1119 | int ret; |
1120 | ||
1121 | pr_debug("%s\n", __func__); | |
1122 | memset(&rsp, 0, sizeof(rsp)); | |
efd838fe | 1123 | rsp.response = tmf_resp_code; |
8e5dadfe | 1124 | |
de4eda9d | 1125 | iov_iter_init(&iov_iter, ITER_DEST, resp_iov, in_iovs, sizeof(rsp)); |
8e5dadfe BM |
1126 | |
1127 | ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter); | |
1128 | if (likely(ret == sizeof(rsp))) | |
efd838fe | 1129 | vhost_add_used_and_signal(&vs->dev, vq, vq_desc, 0); |
0d02dbd6 BM |
1130 | else |
1131 | pr_err("Faulted on virtio_scsi_ctrl_tmf_resp\n"); | |
1132 | } | |
1133 | ||
efd838fe MC |
1134 | static void vhost_scsi_tmf_resp_work(struct vhost_work *work) |
1135 | { | |
1136 | struct vhost_scsi_tmf *tmf = container_of(work, struct vhost_scsi_tmf, | |
1137 | vwork); | |
1138 | int resp_code; | |
1139 | ||
b4fffc17 | 1140 | if (tmf->scsi_resp == TMR_FUNCTION_COMPLETE) |
efd838fe MC |
1141 | resp_code = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; |
1142 | else | |
1143 | resp_code = VIRTIO_SCSI_S_FUNCTION_REJECTED; | |
1144 | ||
1145 | vhost_scsi_send_tmf_resp(tmf->vhost, &tmf->svq->vq, tmf->in_iovs, | |
1146 | tmf->vq_desc, &tmf->resp_iov, resp_code); | |
1147 | vhost_scsi_release_tmf_res(tmf); | |
1148 | } | |
1149 | ||
1150 | static void | |
1151 | vhost_scsi_handle_tmf(struct vhost_scsi *vs, struct vhost_scsi_tpg *tpg, | |
1152 | struct vhost_virtqueue *vq, | |
1153 | struct virtio_scsi_ctrl_tmf_req *vtmf, | |
1154 | struct vhost_scsi_ctx *vc) | |
1155 | { | |
1156 | struct vhost_scsi_virtqueue *svq = container_of(vq, | |
1157 | struct vhost_scsi_virtqueue, vq); | |
1158 | struct vhost_scsi_tmf *tmf; | |
1159 | ||
1160 | if (vhost32_to_cpu(vq, vtmf->subtype) != | |
1161 | VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET) | |
1162 | goto send_reject; | |
1163 | ||
1164 | if (!tpg->tpg_nexus || !tpg->tpg_nexus->tvn_se_sess) { | |
1165 | pr_err("Unable to locate active struct vhost_scsi_nexus for LUN RESET.\n"); | |
1166 | goto send_reject; | |
1167 | } | |
1168 | ||
4c363c81 MC |
1169 | tmf = kzalloc(sizeof(*tmf), GFP_KERNEL); |
1170 | if (!tmf) | |
efd838fe | 1171 | goto send_reject; |
efd838fe | 1172 | |
4c363c81 | 1173 | vhost_work_init(&tmf->vwork, vhost_scsi_tmf_resp_work); |
efd838fe MC |
1174 | tmf->vhost = vs; |
1175 | tmf->svq = svq; | |
1176 | tmf->resp_iov = vq->iov[vc->out]; | |
1177 | tmf->vq_desc = vc->head; | |
1178 | tmf->in_iovs = vc->in; | |
1179 | tmf->inflight = vhost_scsi_get_inflight(vq); | |
1180 | ||
1181 | if (target_submit_tmr(&tmf->se_cmd, tpg->tpg_nexus->tvn_se_sess, NULL, | |
1182 | vhost_buf_to_lun(vtmf->lun), NULL, | |
1183 | TMR_LUN_RESET, GFP_KERNEL, 0, | |
1184 | TARGET_SCF_ACK_KREF) < 0) { | |
1185 | vhost_scsi_release_tmf_res(tmf); | |
1186 | goto send_reject; | |
1187 | } | |
1188 | ||
1189 | return; | |
1190 | ||
1191 | send_reject: | |
1192 | vhost_scsi_send_tmf_resp(vs, vq, vc->in, vc->head, &vq->iov[vc->out], | |
1193 | VIRTIO_SCSI_S_FUNCTION_REJECTED); | |
1194 | } | |
1195 | ||
0d02dbd6 BM |
1196 | static void |
1197 | vhost_scsi_send_an_resp(struct vhost_scsi *vs, | |
3f8ca2e1 BM |
1198 | struct vhost_virtqueue *vq, |
1199 | struct vhost_scsi_ctx *vc) | |
0d02dbd6 | 1200 | { |
0d02dbd6 | 1201 | struct virtio_scsi_ctrl_an_resp rsp; |
8e5dadfe | 1202 | struct iov_iter iov_iter; |
0d02dbd6 BM |
1203 | int ret; |
1204 | ||
1205 | pr_debug("%s\n", __func__); | |
1206 | memset(&rsp, 0, sizeof(rsp)); /* event_actual = 0 */ | |
1207 | rsp.response = VIRTIO_SCSI_S_OK; | |
8e5dadfe | 1208 | |
de4eda9d | 1209 | iov_iter_init(&iov_iter, ITER_DEST, &vq->iov[vc->out], vc->in, sizeof(rsp)); |
8e5dadfe BM |
1210 | |
1211 | ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter); | |
1212 | if (likely(ret == sizeof(rsp))) | |
3f8ca2e1 | 1213 | vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0); |
0d02dbd6 BM |
1214 | else |
1215 | pr_err("Faulted on virtio_scsi_ctrl_an_resp\n"); | |
1216 | } | |
1217 | ||
1218 | static void | |
1219 | vhost_scsi_ctl_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
1220 | { | |
efd838fe | 1221 | struct vhost_scsi_tpg *tpg; |
0d02dbd6 BM |
1222 | union { |
1223 | __virtio32 type; | |
1224 | struct virtio_scsi_ctrl_an_req an; | |
1225 | struct virtio_scsi_ctrl_tmf_req tmf; | |
1226 | } v_req; | |
3f8ca2e1 BM |
1227 | struct vhost_scsi_ctx vc; |
1228 | size_t typ_size; | |
c1ea02f1 | 1229 | int ret, c = 0; |
0d02dbd6 BM |
1230 | |
1231 | mutex_lock(&vq->mutex); | |
1232 | /* | |
1233 | * We can handle the vq only after the endpoint is setup by calling the | |
1234 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
1235 | */ | |
247643f8 | 1236 | if (!vhost_vq_get_backend(vq)) |
0d02dbd6 BM |
1237 | goto out; |
1238 | ||
3f8ca2e1 BM |
1239 | memset(&vc, 0, sizeof(vc)); |
1240 | ||
0d02dbd6 BM |
1241 | vhost_disable_notify(&vs->dev, vq); |
1242 | ||
c1ea02f1 | 1243 | do { |
3f8ca2e1 BM |
1244 | ret = vhost_scsi_get_desc(vs, vq, &vc); |
1245 | if (ret) | |
1246 | goto err; | |
0d02dbd6 BM |
1247 | |
1248 | /* | |
3f8ca2e1 BM |
1249 | * Get the request type first in order to setup |
1250 | * other parameters dependent on the type. | |
0d02dbd6 | 1251 | */ |
3f8ca2e1 | 1252 | vc.req = &v_req.type; |
0d02dbd6 BM |
1253 | typ_size = sizeof(v_req.type); |
1254 | ||
3f8ca2e1 BM |
1255 | if (unlikely(!copy_from_iter_full(vc.req, typ_size, |
1256 | &vc.out_iter))) { | |
0d02dbd6 BM |
1257 | vq_err(vq, "Faulted on copy_from_iter tmf type\n"); |
1258 | /* | |
3f8ca2e1 BM |
1259 | * The size of the response buffer depends on the |
1260 | * request type and must be validated against it. | |
0d02dbd6 BM |
1261 | * Since the request type is not known, don't send |
1262 | * a response. | |
1263 | */ | |
1264 | continue; | |
1265 | } | |
1266 | ||
295c1b98 | 1267 | switch (vhost32_to_cpu(vq, v_req.type)) { |
0d02dbd6 | 1268 | case VIRTIO_SCSI_T_TMF: |
3f8ca2e1 BM |
1269 | vc.req = &v_req.tmf; |
1270 | vc.req_size = sizeof(struct virtio_scsi_ctrl_tmf_req); | |
1271 | vc.rsp_size = sizeof(struct virtio_scsi_ctrl_tmf_resp); | |
1272 | vc.lunp = &v_req.tmf.lun[0]; | |
1273 | vc.target = &v_req.tmf.lun[1]; | |
0d02dbd6 BM |
1274 | break; |
1275 | case VIRTIO_SCSI_T_AN_QUERY: | |
1276 | case VIRTIO_SCSI_T_AN_SUBSCRIBE: | |
3f8ca2e1 BM |
1277 | vc.req = &v_req.an; |
1278 | vc.req_size = sizeof(struct virtio_scsi_ctrl_an_req); | |
1279 | vc.rsp_size = sizeof(struct virtio_scsi_ctrl_an_resp); | |
1280 | vc.lunp = &v_req.an.lun[0]; | |
1281 | vc.target = NULL; | |
0d02dbd6 BM |
1282 | break; |
1283 | default: | |
1284 | vq_err(vq, "Unknown control request %d", v_req.type); | |
1285 | continue; | |
1286 | } | |
1287 | ||
1288 | /* | |
3f8ca2e1 BM |
1289 | * Validate the size of request and response buffers. |
1290 | * Check for a sane response buffer so we can report | |
1291 | * early errors back to the guest. | |
0d02dbd6 | 1292 | */ |
3f8ca2e1 BM |
1293 | ret = vhost_scsi_chk_size(vq, &vc); |
1294 | if (ret) | |
1295 | goto err; | |
0d02dbd6 | 1296 | |
3f8ca2e1 BM |
1297 | /* |
1298 | * Get the rest of the request now that its size is known. | |
1299 | */ | |
1300 | vc.req += typ_size; | |
1301 | vc.req_size -= typ_size; | |
0d02dbd6 | 1302 | |
efd838fe | 1303 | ret = vhost_scsi_get_req(vq, &vc, &tpg); |
3f8ca2e1 BM |
1304 | if (ret) |
1305 | goto err; | |
0d02dbd6 | 1306 | |
3f8ca2e1 | 1307 | if (v_req.type == VIRTIO_SCSI_T_TMF) |
efd838fe | 1308 | vhost_scsi_handle_tmf(vs, tpg, vq, &v_req.tmf, &vc); |
3f8ca2e1 BM |
1309 | else |
1310 | vhost_scsi_send_an_resp(vs, vq, &vc); | |
1311 | err: | |
1312 | /* | |
1313 | * ENXIO: No more requests, or read error, wait for next kick | |
1314 | * EINVAL: Invalid response buffer, drop the request | |
1315 | * EIO: Respond with bad target | |
1316 | * EAGAIN: Pending request | |
1317 | */ | |
1318 | if (ret == -ENXIO) | |
1319 | break; | |
1320 | else if (ret == -EIO) | |
1321 | vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out); | |
c1ea02f1 | 1322 | } while (likely(!vhost_exceeds_weight(vq, ++c, 0))); |
0d02dbd6 BM |
1323 | out: |
1324 | mutex_unlock(&vq->mutex); | |
1325 | } | |
1326 | ||
057cbf49 NB |
1327 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) |
1328 | { | |
0d02dbd6 BM |
1329 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1330 | poll.work); | |
1331 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1332 | ||
101998f6 | 1333 | pr_debug("%s: The handling func for control queue.\n", __func__); |
0d02dbd6 | 1334 | vhost_scsi_ctl_handle_vq(vs, vq); |
057cbf49 NB |
1335 | } |
1336 | ||
683bd967 | 1337 | static void |
1a1ff825 NB |
1338 | vhost_scsi_send_evt(struct vhost_scsi *vs, |
1339 | struct vhost_scsi_tpg *tpg, | |
683bd967 AH |
1340 | struct se_lun *lun, |
1341 | u32 event, | |
1342 | u32 reason) | |
a6c9af87 | 1343 | { |
1a1ff825 | 1344 | struct vhost_scsi_evt *evt; |
a6c9af87 | 1345 | |
1a1ff825 | 1346 | evt = vhost_scsi_allocate_evt(vs, event, reason); |
a6c9af87 AH |
1347 | if (!evt) |
1348 | return; | |
1349 | ||
1350 | if (tpg && lun) { | |
1351 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
1352 | /* | |
1353 | * Note: evt->event is zeroed when we allocate it and | |
1354 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
1355 | */ | |
1356 | evt->event.lun[0] = 0x01; | |
59c816c1 | 1357 | evt->event.lun[1] = tpg->tport_tpgt; |
a6c9af87 AH |
1358 | if (lun->unpacked_lun >= 256) |
1359 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
1360 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
1361 | } | |
1362 | ||
1363 | llist_add(&evt->list, &vs->vs_event_list); | |
1364 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
1365 | } | |
1366 | ||
057cbf49 NB |
1367 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
1368 | { | |
a6c9af87 AH |
1369 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1370 | poll.work); | |
1371 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1372 | ||
1373 | mutex_lock(&vq->mutex); | |
247643f8 | 1374 | if (!vhost_vq_get_backend(vq)) |
a6c9af87 AH |
1375 | goto out; |
1376 | ||
1377 | if (vs->vs_events_missed) | |
1a1ff825 | 1378 | vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); |
a6c9af87 AH |
1379 | out: |
1380 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
1381 | } |
1382 | ||
1383 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
1384 | { | |
1385 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
1386 | poll.work); | |
1387 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1388 | ||
1b7f390e | 1389 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
1390 | } |
1391 | ||
3dfbff32 | 1392 | /* Callers must hold dev mutex */ |
4f7f46d3 AH |
1393 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
1394 | { | |
1395 | int i; | |
1396 | ||
f2f0173d | 1397 | /* Init new inflight and remember the old inflight */ |
f49c2226 | 1398 | vhost_scsi_init_inflight(vs, vs->old_inflight); |
f2f0173d AH |
1399 | |
1400 | /* | |
1401 | * The inflight->kref was initialized to 1. We decrement it here to | |
1402 | * indicate the start of the flush operation so that it will reach 0 | |
1403 | * when all the reqs are finished. | |
1404 | */ | |
f49c2226 MC |
1405 | for (i = 0; i < vs->dev.nvqs; i++) |
1406 | kref_put(&vs->old_inflight[i]->kref, vhost_scsi_done_inflight); | |
f2f0173d AH |
1407 | |
1408 | /* Flush both the vhost poll and vhost work */ | |
b2ffa407 | 1409 | vhost_dev_flush(&vs->dev); |
f2f0173d AH |
1410 | |
1411 | /* Wait for all reqs issued before the flush to be finished */ | |
f49c2226 MC |
1412 | for (i = 0; i < vs->dev.nvqs; i++) |
1413 | wait_for_completion(&vs->old_inflight[i]->comp); | |
4f7f46d3 AH |
1414 | } |
1415 | ||
25b98b64 MC |
1416 | static void vhost_scsi_destroy_vq_cmds(struct vhost_virtqueue *vq) |
1417 | { | |
1418 | struct vhost_scsi_virtqueue *svq = container_of(vq, | |
1419 | struct vhost_scsi_virtqueue, vq); | |
1420 | struct vhost_scsi_cmd *tv_cmd; | |
1421 | unsigned int i; | |
1422 | ||
1423 | if (!svq->scsi_cmds) | |
1424 | return; | |
1425 | ||
1426 | for (i = 0; i < svq->max_cmds; i++) { | |
1427 | tv_cmd = &svq->scsi_cmds[i]; | |
1428 | ||
1429 | kfree(tv_cmd->tvc_sgl); | |
1430 | kfree(tv_cmd->tvc_prot_sgl); | |
1431 | kfree(tv_cmd->tvc_upages); | |
6dd88fd5 | 1432 | kfree(tv_cmd->tvc_resp_iov); |
25b98b64 MC |
1433 | } |
1434 | ||
1435 | sbitmap_free(&svq->scsi_tags); | |
1436 | kfree(svq->scsi_cmds); | |
1437 | svq->scsi_cmds = NULL; | |
1438 | } | |
1439 | ||
1440 | static int vhost_scsi_setup_vq_cmds(struct vhost_virtqueue *vq, int max_cmds) | |
1441 | { | |
1442 | struct vhost_scsi_virtqueue *svq = container_of(vq, | |
1443 | struct vhost_scsi_virtqueue, vq); | |
1444 | struct vhost_scsi_cmd *tv_cmd; | |
1445 | unsigned int i; | |
1446 | ||
1447 | if (svq->scsi_cmds) | |
1448 | return 0; | |
1449 | ||
1450 | if (sbitmap_init_node(&svq->scsi_tags, max_cmds, -1, GFP_KERNEL, | |
c548e62b | 1451 | NUMA_NO_NODE, false, true)) |
25b98b64 MC |
1452 | return -ENOMEM; |
1453 | svq->max_cmds = max_cmds; | |
1454 | ||
1455 | svq->scsi_cmds = kcalloc(max_cmds, sizeof(*tv_cmd), GFP_KERNEL); | |
1456 | if (!svq->scsi_cmds) { | |
1457 | sbitmap_free(&svq->scsi_tags); | |
1458 | return -ENOMEM; | |
1459 | } | |
1460 | ||
1461 | for (i = 0; i < max_cmds; i++) { | |
1462 | tv_cmd = &svq->scsi_cmds[i]; | |
1463 | ||
1464 | tv_cmd->tvc_sgl = kcalloc(VHOST_SCSI_PREALLOC_SGLS, | |
1465 | sizeof(struct scatterlist), | |
1466 | GFP_KERNEL); | |
1467 | if (!tv_cmd->tvc_sgl) { | |
1468 | pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); | |
1469 | goto out; | |
1470 | } | |
1471 | ||
1472 | tv_cmd->tvc_upages = kcalloc(VHOST_SCSI_PREALLOC_UPAGES, | |
1473 | sizeof(struct page *), | |
1474 | GFP_KERNEL); | |
1475 | if (!tv_cmd->tvc_upages) { | |
1476 | pr_err("Unable to allocate tv_cmd->tvc_upages\n"); | |
1477 | goto out; | |
1478 | } | |
1479 | ||
6dd88fd5 JW |
1480 | tv_cmd->tvc_resp_iov = kcalloc(UIO_MAXIOV, |
1481 | sizeof(struct iovec), | |
1482 | GFP_KERNEL); | |
1483 | if (!tv_cmd->tvc_resp_iov) { | |
1484 | pr_err("Unable to allocate tv_cmd->tvc_resp_iov\n"); | |
1485 | goto out; | |
1486 | } | |
1487 | ||
25b98b64 MC |
1488 | tv_cmd->tvc_prot_sgl = kcalloc(VHOST_SCSI_PREALLOC_PROT_SGLS, |
1489 | sizeof(struct scatterlist), | |
1490 | GFP_KERNEL); | |
1491 | if (!tv_cmd->tvc_prot_sgl) { | |
1492 | pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); | |
1493 | goto out; | |
1494 | } | |
1495 | } | |
1496 | return 0; | |
1497 | out: | |
1498 | vhost_scsi_destroy_vq_cmds(vq); | |
1499 | return -ENOMEM; | |
1500 | } | |
1501 | ||
057cbf49 NB |
1502 | /* |
1503 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
1a1ff825 | 1504 | * vhost_scsi_tpg with an active struct vhost_scsi_nexus |
f2b7daf5 AH |
1505 | * |
1506 | * The lock nesting rule is: | |
bea273c7 | 1507 | * vs->dev.mutex -> vhost_scsi_mutex -> tpg->tv_tpg_mutex -> vq->mutex |
057cbf49 | 1508 | */ |
683bd967 AH |
1509 | static int |
1510 | vhost_scsi_set_endpoint(struct vhost_scsi *vs, | |
1511 | struct vhost_scsi_target *t) | |
057cbf49 | 1512 | { |
ab8edab1 | 1513 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1514 | struct vhost_scsi_tport *tv_tport; |
1515 | struct vhost_scsi_tpg *tpg; | |
1516 | struct vhost_scsi_tpg **vs_tpg; | |
4f7f46d3 AH |
1517 | struct vhost_virtqueue *vq; |
1518 | int index, ret, i, len; | |
67e18cf9 | 1519 | bool match = false; |
057cbf49 NB |
1520 | |
1521 | mutex_lock(&vs->dev.mutex); | |
f2b7daf5 | 1522 | |
057cbf49 NB |
1523 | /* Verify that ring has been setup correctly. */ |
1524 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
1525 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 1526 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
1527 | ret = -EFAULT; |
1528 | goto out; | |
057cbf49 NB |
1529 | } |
1530 | } | |
057cbf49 | 1531 | |
4f7f46d3 AH |
1532 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
1533 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
1534 | if (!vs_tpg) { | |
f2b7daf5 AH |
1535 | ret = -ENOMEM; |
1536 | goto out; | |
4f7f46d3 AH |
1537 | } |
1538 | if (vs->vs_tpg) | |
1539 | memcpy(vs_tpg, vs->vs_tpg, len); | |
1540 | ||
bea273c7 | 1541 | mutex_lock(&vhost_scsi_mutex); |
1a1ff825 | 1542 | list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) { |
98718312 AH |
1543 | mutex_lock(&tpg->tv_tpg_mutex); |
1544 | if (!tpg->tpg_nexus) { | |
1545 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1546 | continue; |
1547 | } | |
98718312 AH |
1548 | if (tpg->tv_tpg_vhost_count != 0) { |
1549 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1550 | continue; |
1551 | } | |
98718312 | 1552 | tv_tport = tpg->tport; |
057cbf49 | 1553 | |
67e18cf9 | 1554 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
98718312 | 1555 | if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
98718312 | 1556 | mutex_unlock(&tpg->tv_tpg_mutex); |
bea273c7 | 1557 | mutex_unlock(&vhost_scsi_mutex); |
f2b7daf5 | 1558 | ret = -EEXIST; |
25b98b64 | 1559 | goto undepend; |
101998f6 | 1560 | } |
ab8edab1 NB |
1561 | /* |
1562 | * In order to ensure individual vhost-scsi configfs | |
1563 | * groups cannot be removed while in use by vhost ioctl, | |
1564 | * go ahead and take an explicit se_tpg->tpg_group.cg_item | |
1565 | * dependency now. | |
1566 | */ | |
1567 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1568 | ret = target_depend_item(&se_tpg->tpg_group.cg_item); |
ab8edab1 | 1569 | if (ret) { |
a691ffb4 | 1570 | pr_warn("target_depend_item() failed: %d\n", ret); |
ab8edab1 | 1571 | mutex_unlock(&tpg->tv_tpg_mutex); |
bea273c7 | 1572 | mutex_unlock(&vhost_scsi_mutex); |
25b98b64 | 1573 | goto undepend; |
ab8edab1 | 1574 | } |
98718312 AH |
1575 | tpg->tv_tpg_vhost_count++; |
1576 | tpg->vhost_scsi = vs; | |
1577 | vs_tpg[tpg->tport_tpgt] = tpg; | |
67e18cf9 | 1578 | match = true; |
057cbf49 | 1579 | } |
98718312 | 1580 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1581 | } |
bea273c7 | 1582 | mutex_unlock(&vhost_scsi_mutex); |
67e18cf9 AH |
1583 | |
1584 | if (match) { | |
1585 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1586 | sizeof(vs->vs_vhost_wwpn)); | |
25b98b64 | 1587 | |
f49c2226 | 1588 | for (i = VHOST_SCSI_VQ_IO; i < vs->dev.nvqs; i++) { |
25b98b64 MC |
1589 | vq = &vs->vqs[i].vq; |
1590 | if (!vhost_vq_is_setup(vq)) | |
1591 | continue; | |
1592 | ||
2e1139d6 ZC |
1593 | ret = vhost_scsi_setup_vq_cmds(vq, vq->num); |
1594 | if (ret) | |
25b98b64 MC |
1595 | goto destroy_vq_cmds; |
1596 | } | |
1597 | ||
f49c2226 | 1598 | for (i = 0; i < vs->dev.nvqs; i++) { |
3ab2e420 | 1599 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1600 | mutex_lock(&vq->mutex); |
247643f8 | 1601 | vhost_vq_set_backend(vq, vs_tpg); |
80f7d030 | 1602 | vhost_vq_init_access(vq); |
4f7f46d3 AH |
1603 | mutex_unlock(&vq->mutex); |
1604 | } | |
67e18cf9 AH |
1605 | ret = 0; |
1606 | } else { | |
1607 | ret = -EEXIST; | |
1608 | } | |
1609 | ||
4f7f46d3 AH |
1610 | /* |
1611 | * Act as synchronize_rcu to make sure access to | |
1612 | * old vs->vs_tpg is finished. | |
1613 | */ | |
1614 | vhost_scsi_flush(vs); | |
1615 | kfree(vs->vs_tpg); | |
1616 | vs->vs_tpg = vs_tpg; | |
25b98b64 | 1617 | goto out; |
4f7f46d3 | 1618 | |
25b98b64 MC |
1619 | destroy_vq_cmds: |
1620 | for (i--; i >= VHOST_SCSI_VQ_IO; i--) { | |
1621 | if (!vhost_vq_get_backend(&vs->vqs[i].vq)) | |
1622 | vhost_scsi_destroy_vq_cmds(&vs->vqs[i].vq); | |
1623 | } | |
1624 | undepend: | |
1625 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { | |
1626 | tpg = vs_tpg[i]; | |
1627 | if (tpg) { | |
e508efc3 MC |
1628 | mutex_lock(&tpg->tv_tpg_mutex); |
1629 | tpg->vhost_scsi = NULL; | |
25b98b64 | 1630 | tpg->tv_tpg_vhost_count--; |
e508efc3 | 1631 | mutex_unlock(&tpg->tv_tpg_mutex); |
25b98b64 MC |
1632 | target_undepend_item(&tpg->se_tpg.tpg_group.cg_item); |
1633 | } | |
1634 | } | |
1635 | kfree(vs_tpg); | |
f2b7daf5 | 1636 | out: |
67e18cf9 AH |
1637 | mutex_unlock(&vs->dev.mutex); |
1638 | return ret; | |
057cbf49 NB |
1639 | } |
1640 | ||
683bd967 AH |
1641 | static int |
1642 | vhost_scsi_clear_endpoint(struct vhost_scsi *vs, | |
1643 | struct vhost_scsi_target *t) | |
057cbf49 | 1644 | { |
ab8edab1 | 1645 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1646 | struct vhost_scsi_tport *tv_tport; |
1647 | struct vhost_scsi_tpg *tpg; | |
4f7f46d3 AH |
1648 | struct vhost_virtqueue *vq; |
1649 | bool match = false; | |
67e18cf9 AH |
1650 | int index, ret, i; |
1651 | u8 target; | |
057cbf49 NB |
1652 | |
1653 | mutex_lock(&vs->dev.mutex); | |
1654 | /* Verify that ring has been setup correctly. */ | |
1655 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1656 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1657 | ret = -EFAULT; |
038e0af4 | 1658 | goto err_dev; |
057cbf49 NB |
1659 | } |
1660 | } | |
4f7f46d3 AH |
1661 | |
1662 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1663 | ret = 0; |
1664 | goto err_dev; | |
4f7f46d3 AH |
1665 | } |
1666 | ||
67e18cf9 AH |
1667 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1668 | target = i; | |
98718312 AH |
1669 | tpg = vs->vs_tpg[target]; |
1670 | if (!tpg) | |
67e18cf9 AH |
1671 | continue; |
1672 | ||
98718312 | 1673 | tv_tport = tpg->tport; |
67e18cf9 AH |
1674 | if (!tv_tport) { |
1675 | ret = -ENODEV; | |
9a10cb4d | 1676 | goto err_dev; |
67e18cf9 AH |
1677 | } |
1678 | ||
1679 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
98718312 | 1680 | pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" |
67e18cf9 | 1681 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", |
98718312 | 1682 | tv_tport->tport_name, tpg->tport_tpgt, |
67e18cf9 AH |
1683 | t->vhost_wwpn, t->vhost_tpgt); |
1684 | ret = -EINVAL; | |
9a10cb4d | 1685 | goto err_dev; |
67e18cf9 | 1686 | } |
9a10cb4d MC |
1687 | match = true; |
1688 | } | |
1689 | if (!match) | |
1690 | goto free_vs_tpg; | |
1691 | ||
1692 | /* Prevent new cmds from starting and accessing the tpgs/sessions */ | |
1693 | for (i = 0; i < vs->dev.nvqs; i++) { | |
1694 | vq = &vs->vqs[i].vq; | |
1695 | mutex_lock(&vq->mutex); | |
1696 | vhost_vq_set_backend(vq, NULL); | |
1697 | mutex_unlock(&vq->mutex); | |
1698 | } | |
1699 | /* Make sure cmds are not running before tearing them down. */ | |
1700 | vhost_scsi_flush(vs); | |
1701 | ||
1702 | for (i = 0; i < vs->dev.nvqs; i++) { | |
1703 | vq = &vs->vqs[i].vq; | |
1704 | vhost_scsi_destroy_vq_cmds(vq); | |
1705 | } | |
1706 | ||
1707 | /* | |
1708 | * We can now release our hold on the tpg and sessions and userspace | |
1709 | * can free them after this point. | |
1710 | */ | |
1711 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { | |
1712 | target = i; | |
1713 | tpg = vs->vs_tpg[target]; | |
1714 | if (!tpg) | |
1715 | continue; | |
1716 | ||
1717 | mutex_lock(&tpg->tv_tpg_mutex); | |
1718 | ||
98718312 AH |
1719 | tpg->tv_tpg_vhost_count--; |
1720 | tpg->vhost_scsi = NULL; | |
67e18cf9 | 1721 | vs->vs_tpg[target] = NULL; |
9a10cb4d | 1722 | |
98718312 | 1723 | mutex_unlock(&tpg->tv_tpg_mutex); |
9a10cb4d | 1724 | |
ab8edab1 | 1725 | se_tpg = &tpg->se_tpg; |
d588cf8f | 1726 | target_undepend_item(&se_tpg->tpg_group.cg_item); |
057cbf49 | 1727 | } |
d60146c1 | 1728 | |
9a10cb4d | 1729 | free_vs_tpg: |
4f7f46d3 AH |
1730 | /* |
1731 | * Act as synchronize_rcu to make sure access to | |
1732 | * old vs->vs_tpg is finished. | |
1733 | */ | |
1734 | vhost_scsi_flush(vs); | |
1735 | kfree(vs->vs_tpg); | |
1736 | vs->vs_tpg = NULL; | |
a6c9af87 | 1737 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1738 | mutex_unlock(&vs->dev.mutex); |
057cbf49 | 1739 | return 0; |
101998f6 | 1740 | |
038e0af4 | 1741 | err_dev: |
101998f6 NB |
1742 | mutex_unlock(&vs->dev.mutex); |
1743 | return ret; | |
057cbf49 NB |
1744 | } |
1745 | ||
4f7f46d3 AH |
1746 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1747 | { | |
ea16c514 MT |
1748 | struct vhost_virtqueue *vq; |
1749 | int i; | |
1750 | ||
4f7f46d3 AH |
1751 | if (features & ~VHOST_SCSI_FEATURES) |
1752 | return -EOPNOTSUPP; | |
1753 | ||
1754 | mutex_lock(&vs->dev.mutex); | |
1755 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1756 | !vhost_log_access_ok(&vs->dev)) { | |
1757 | mutex_unlock(&vs->dev.mutex); | |
1758 | return -EFAULT; | |
1759 | } | |
ea16c514 | 1760 | |
f49c2226 | 1761 | for (i = 0; i < vs->dev.nvqs; i++) { |
ea16c514 MT |
1762 | vq = &vs->vqs[i].vq; |
1763 | mutex_lock(&vq->mutex); | |
1764 | vq->acked_features = features; | |
1765 | mutex_unlock(&vq->mutex); | |
1766 | } | |
4f7f46d3 AH |
1767 | mutex_unlock(&vs->dev.mutex); |
1768 | return 0; | |
1769 | } | |
1770 | ||
057cbf49 NB |
1771 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1772 | { | |
c7289312 | 1773 | struct vhost_scsi *vs; |
3ab2e420 | 1774 | struct vhost_virtqueue **vqs; |
f49c2226 | 1775 | int r = -ENOMEM, i, nvqs = vhost_scsi_max_io_vqs; |
057cbf49 | 1776 | |
489084dd DZ |
1777 | vs = kvzalloc(sizeof(*vs), GFP_KERNEL); |
1778 | if (!vs) | |
1779 | goto err_vs; | |
057cbf49 | 1780 | |
f49c2226 MC |
1781 | if (nvqs > VHOST_SCSI_MAX_IO_VQ) { |
1782 | pr_err("Invalid max_io_vqs of %d. Using %d.\n", nvqs, | |
1783 | VHOST_SCSI_MAX_IO_VQ); | |
1784 | nvqs = VHOST_SCSI_MAX_IO_VQ; | |
1785 | } else if (nvqs == 0) { | |
1786 | pr_err("Invalid max_io_vqs of %d. Using 1.\n", nvqs); | |
1787 | nvqs = 1; | |
1788 | } | |
1789 | nvqs += VHOST_SCSI_VQ_IO; | |
1790 | ||
1791 | vs->compl_bitmap = bitmap_alloc(nvqs, GFP_KERNEL); | |
1792 | if (!vs->compl_bitmap) | |
1793 | goto err_compl_bitmap; | |
1794 | ||
1795 | vs->old_inflight = kmalloc_array(nvqs, sizeof(*vs->old_inflight), | |
1796 | GFP_KERNEL | __GFP_ZERO); | |
1797 | if (!vs->old_inflight) | |
1798 | goto err_inflight; | |
1799 | ||
1800 | vs->vqs = kmalloc_array(nvqs, sizeof(*vs->vqs), | |
1801 | GFP_KERNEL | __GFP_ZERO); | |
1802 | if (!vs->vqs) | |
595cb754 | 1803 | goto err_vqs; |
3ab2e420 | 1804 | |
f49c2226 MC |
1805 | vqs = kmalloc_array(nvqs, sizeof(*vqs), GFP_KERNEL); |
1806 | if (!vqs) | |
1807 | goto err_local_vqs; | |
1808 | ||
c7289312 | 1809 | vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); |
1a1ff825 | 1810 | vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work); |
a6c9af87 | 1811 | |
c7289312 AH |
1812 | vs->vs_events_nr = 0; |
1813 | vs->vs_events_missed = false; | |
057cbf49 | 1814 | |
c7289312 AH |
1815 | vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; |
1816 | vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1817 | vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1818 | vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
f49c2226 | 1819 | for (i = VHOST_SCSI_VQ_IO; i < nvqs; i++) { |
c7289312 AH |
1820 | vqs[i] = &vs->vqs[i].vq; |
1821 | vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
3ab2e420 | 1822 | } |
f49c2226 | 1823 | vhost_dev_init(&vs->dev, vqs, nvqs, UIO_MAXIOV, |
01fcb1cb | 1824 | VHOST_SCSI_WEIGHT, 0, true, NULL); |
f2f0173d | 1825 | |
1a1ff825 | 1826 | vhost_scsi_init_inflight(vs, NULL); |
f2f0173d | 1827 | |
c7289312 | 1828 | f->private_data = vs; |
057cbf49 | 1829 | return 0; |
595cb754 | 1830 | |
f49c2226 MC |
1831 | err_local_vqs: |
1832 | kfree(vs->vqs); | |
595cb754 | 1833 | err_vqs: |
f49c2226 MC |
1834 | kfree(vs->old_inflight); |
1835 | err_inflight: | |
1836 | bitmap_free(vs->compl_bitmap); | |
1837 | err_compl_bitmap: | |
68404441 | 1838 | kvfree(vs); |
595cb754 MT |
1839 | err_vs: |
1840 | return r; | |
057cbf49 NB |
1841 | } |
1842 | ||
1843 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1844 | { | |
c7289312 | 1845 | struct vhost_scsi *vs = f->private_data; |
67e18cf9 | 1846 | struct vhost_scsi_target t; |
057cbf49 | 1847 | |
c7289312 AH |
1848 | mutex_lock(&vs->dev.mutex); |
1849 | memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1850 | mutex_unlock(&vs->dev.mutex); | |
1851 | vhost_scsi_clear_endpoint(vs, &t); | |
1852 | vhost_dev_stop(&vs->dev); | |
f6f93f75 | 1853 | vhost_dev_cleanup(&vs->dev); |
c7289312 | 1854 | kfree(vs->dev.vqs); |
f49c2226 MC |
1855 | kfree(vs->vqs); |
1856 | kfree(vs->old_inflight); | |
1857 | bitmap_free(vs->compl_bitmap); | |
68404441 | 1858 | kvfree(vs); |
057cbf49 NB |
1859 | return 0; |
1860 | } | |
1861 | ||
683bd967 AH |
1862 | static long |
1863 | vhost_scsi_ioctl(struct file *f, | |
1864 | unsigned int ioctl, | |
1865 | unsigned long arg) | |
057cbf49 NB |
1866 | { |
1867 | struct vhost_scsi *vs = f->private_data; | |
1868 | struct vhost_scsi_target backend; | |
1869 | void __user *argp = (void __user *)arg; | |
1870 | u64 __user *featurep = argp; | |
11c63418 AH |
1871 | u32 __user *eventsp = argp; |
1872 | u32 events_missed; | |
057cbf49 | 1873 | u64 features; |
101998f6 | 1874 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1875 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1876 | |
1877 | switch (ioctl) { | |
1878 | case VHOST_SCSI_SET_ENDPOINT: | |
1879 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1880 | return -EFAULT; | |
6de7145c MT |
1881 | if (backend.reserved != 0) |
1882 | return -EOPNOTSUPP; | |
057cbf49 NB |
1883 | |
1884 | return vhost_scsi_set_endpoint(vs, &backend); | |
1885 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1886 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1887 | return -EFAULT; | |
6de7145c MT |
1888 | if (backend.reserved != 0) |
1889 | return -EOPNOTSUPP; | |
057cbf49 NB |
1890 | |
1891 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1892 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1893 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1894 | return -EFAULT; |
1895 | return 0; | |
11c63418 AH |
1896 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1897 | if (get_user(events_missed, eventsp)) | |
1898 | return -EFAULT; | |
1899 | mutex_lock(&vq->mutex); | |
1900 | vs->vs_events_missed = events_missed; | |
1901 | mutex_unlock(&vq->mutex); | |
1902 | return 0; | |
1903 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1904 | mutex_lock(&vq->mutex); | |
1905 | events_missed = vs->vs_events_missed; | |
1906 | mutex_unlock(&vq->mutex); | |
1907 | if (put_user(events_missed, eventsp)) | |
1908 | return -EFAULT; | |
1909 | return 0; | |
057cbf49 | 1910 | case VHOST_GET_FEATURES: |
5dade710 | 1911 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1912 | if (copy_to_user(featurep, &features, sizeof features)) |
1913 | return -EFAULT; | |
1914 | return 0; | |
1915 | case VHOST_SET_FEATURES: | |
1916 | if (copy_from_user(&features, featurep, sizeof features)) | |
1917 | return -EFAULT; | |
1918 | return vhost_scsi_set_features(vs, features); | |
1919 | default: | |
1920 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1921 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1922 | /* TODO: flush backend after dev ioctl. */ | |
1923 | if (r == -ENOIOCTLCMD) | |
1924 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1925 | mutex_unlock(&vs->dev.mutex); |
1926 | return r; | |
1927 | } | |
1928 | } | |
1929 | ||
1930 | static const struct file_operations vhost_scsi_fops = { | |
1931 | .owner = THIS_MODULE, | |
1932 | .release = vhost_scsi_release, | |
1933 | .unlocked_ioctl = vhost_scsi_ioctl, | |
407e9ef7 | 1934 | .compat_ioctl = compat_ptr_ioctl, |
057cbf49 NB |
1935 | .open = vhost_scsi_open, |
1936 | .llseek = noop_llseek, | |
1937 | }; | |
1938 | ||
1939 | static struct miscdevice vhost_scsi_misc = { | |
1940 | MISC_DYNAMIC_MINOR, | |
1941 | "vhost-scsi", | |
1942 | &vhost_scsi_fops, | |
1943 | }; | |
1944 | ||
1945 | static int __init vhost_scsi_register(void) | |
1946 | { | |
1947 | return misc_register(&vhost_scsi_misc); | |
1948 | } | |
1949 | ||
f368ed60 | 1950 | static void vhost_scsi_deregister(void) |
057cbf49 | 1951 | { |
f368ed60 | 1952 | misc_deregister(&vhost_scsi_misc); |
057cbf49 NB |
1953 | } |
1954 | ||
1a1ff825 | 1955 | static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport) |
057cbf49 NB |
1956 | { |
1957 | switch (tport->tport_proto_id) { | |
1958 | case SCSI_PROTOCOL_SAS: | |
1959 | return "SAS"; | |
1960 | case SCSI_PROTOCOL_FCP: | |
1961 | return "FCP"; | |
1962 | case SCSI_PROTOCOL_ISCSI: | |
1963 | return "iSCSI"; | |
1964 | default: | |
1965 | break; | |
1966 | } | |
1967 | ||
1968 | return "Unknown"; | |
1969 | } | |
1970 | ||
683bd967 | 1971 | static void |
1a1ff825 | 1972 | vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg, |
683bd967 | 1973 | struct se_lun *lun, bool plug) |
a6c9af87 AH |
1974 | { |
1975 | ||
1976 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1977 | struct vhost_virtqueue *vq; | |
1978 | u32 reason; | |
1979 | ||
1980 | if (!vs) | |
1981 | return; | |
1982 | ||
a6c9af87 AH |
1983 | if (plug) |
1984 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1985 | else | |
1986 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1987 | ||
3ab2e420 | 1988 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 | 1989 | mutex_lock(&vq->mutex); |
ced9eb37 MC |
1990 | /* |
1991 | * We can't queue events if the backend has been cleared, because | |
1992 | * we could end up queueing an event after the flush. | |
1993 | */ | |
1994 | if (!vhost_vq_get_backend(vq)) | |
1995 | goto unlock; | |
1996 | ||
ea16c514 | 1997 | if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG)) |
1a1ff825 | 1998 | vhost_scsi_send_evt(vs, tpg, lun, |
ea16c514 | 1999 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); |
ced9eb37 | 2000 | unlock: |
a6c9af87 | 2001 | mutex_unlock(&vq->mutex); |
a6c9af87 AH |
2002 | } |
2003 | ||
1a1ff825 | 2004 | static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 2005 | { |
1a1ff825 | 2006 | vhost_scsi_do_plug(tpg, lun, true); |
a6c9af87 AH |
2007 | } |
2008 | ||
1a1ff825 | 2009 | static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 2010 | { |
1a1ff825 | 2011 | vhost_scsi_do_plug(tpg, lun, false); |
a6c9af87 AH |
2012 | } |
2013 | ||
1a1ff825 | 2014 | static int vhost_scsi_port_link(struct se_portal_group *se_tpg, |
683bd967 | 2015 | struct se_lun *lun) |
057cbf49 | 2016 | { |
1a1ff825 NB |
2017 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2018 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 2019 | |
98718312 AH |
2020 | mutex_lock(&tpg->tv_tpg_mutex); |
2021 | tpg->tv_tpg_port_count++; | |
1a1ff825 | 2022 | vhost_scsi_hotplug(tpg, lun); |
f5ed6f9e | 2023 | mutex_unlock(&tpg->tv_tpg_mutex); |
a6c9af87 | 2024 | |
057cbf49 NB |
2025 | return 0; |
2026 | } | |
2027 | ||
1a1ff825 | 2028 | static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg, |
683bd967 | 2029 | struct se_lun *lun) |
057cbf49 | 2030 | { |
1a1ff825 NB |
2031 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2032 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 2033 | |
98718312 AH |
2034 | mutex_lock(&tpg->tv_tpg_mutex); |
2035 | tpg->tv_tpg_port_count--; | |
1a1ff825 | 2036 | vhost_scsi_hotunplug(tpg, lun); |
f5ed6f9e | 2037 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2038 | } |
2039 | ||
2eafd729 CH |
2040 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store( |
2041 | struct config_item *item, const char *page, size_t count) | |
b1d75fe5 | 2042 | { |
2eafd729 | 2043 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
b1d75fe5 NB |
2044 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2045 | struct vhost_scsi_tpg, se_tpg); | |
2046 | unsigned long val; | |
2047 | int ret = kstrtoul(page, 0, &val); | |
2048 | ||
2049 | if (ret) { | |
2050 | pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); | |
2051 | return ret; | |
2052 | } | |
2053 | if (val != 0 && val != 1 && val != 3) { | |
2054 | pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val); | |
2055 | return -EINVAL; | |
2056 | } | |
2057 | tpg->tv_fabric_prot_type = val; | |
2058 | ||
2059 | return count; | |
2060 | } | |
2061 | ||
2eafd729 CH |
2062 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show( |
2063 | struct config_item *item, char *page) | |
b1d75fe5 | 2064 | { |
2eafd729 | 2065 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
b1d75fe5 NB |
2066 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2067 | struct vhost_scsi_tpg, se_tpg); | |
2068 | ||
b3d4f02e | 2069 | return sysfs_emit(page, "%d\n", tpg->tv_fabric_prot_type); |
b1d75fe5 | 2070 | } |
2eafd729 CH |
2071 | |
2072 | CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type); | |
b1d75fe5 NB |
2073 | |
2074 | static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = { | |
2eafd729 | 2075 | &vhost_scsi_tpg_attrib_attr_fabric_prot_type, |
b1d75fe5 NB |
2076 | NULL, |
2077 | }; | |
2078 | ||
65ea7898 NB |
2079 | static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg, |
2080 | const char *name) | |
2081 | { | |
65ea7898 NB |
2082 | struct vhost_scsi_nexus *tv_nexus; |
2083 | ||
2084 | mutex_lock(&tpg->tv_tpg_mutex); | |
2085 | if (tpg->tpg_nexus) { | |
2086 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2087 | pr_debug("tpg->tpg_nexus already exists\n"); | |
2088 | return -EEXIST; | |
2089 | } | |
65ea7898 | 2090 | |
473f0b15 | 2091 | tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); |
65ea7898 NB |
2092 | if (!tv_nexus) { |
2093 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2094 | pr_err("Unable to allocate struct vhost_scsi_nexus\n"); | |
2095 | return -ENOMEM; | |
2096 | } | |
057cbf49 NB |
2097 | /* |
2098 | * Since we are running in 'demo mode' this call with generate a | |
1a1ff825 | 2099 | * struct se_node_acl for the vhost_scsi struct se_portal_group with |
057cbf49 NB |
2100 | * the SCSI Initiator port name of the passed configfs group 'name'. |
2101 | */ | |
25b98b64 | 2102 | tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, 0, 0, |
65ea7898 | 2103 | TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS, |
25b98b64 | 2104 | (unsigned char *)name, tv_nexus, NULL); |
65ea7898 | 2105 | if (IS_ERR(tv_nexus->tvn_se_sess)) { |
98718312 | 2106 | mutex_unlock(&tpg->tv_tpg_mutex); |
65ea7898 NB |
2107 | kfree(tv_nexus); |
2108 | return -ENOMEM; | |
057cbf49 | 2109 | } |
98718312 | 2110 | tpg->tpg_nexus = tv_nexus; |
057cbf49 | 2111 | |
98718312 | 2112 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2113 | return 0; |
2114 | } | |
2115 | ||
1a1ff825 | 2116 | static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg) |
057cbf49 NB |
2117 | { |
2118 | struct se_session *se_sess; | |
1a1ff825 | 2119 | struct vhost_scsi_nexus *tv_nexus; |
057cbf49 NB |
2120 | |
2121 | mutex_lock(&tpg->tv_tpg_mutex); | |
2122 | tv_nexus = tpg->tpg_nexus; | |
2123 | if (!tv_nexus) { | |
2124 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2125 | return -ENODEV; | |
2126 | } | |
2127 | ||
2128 | se_sess = tv_nexus->tvn_se_sess; | |
2129 | if (!se_sess) { | |
2130 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2131 | return -ENODEV; | |
2132 | } | |
2133 | ||
101998f6 | 2134 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 2135 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 2136 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 2137 | " active TPG port count: %d\n", |
101998f6 NB |
2138 | tpg->tv_tpg_port_count); |
2139 | return -EBUSY; | |
057cbf49 NB |
2140 | } |
2141 | ||
101998f6 | 2142 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 2143 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 2144 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 2145 | " active TPG vhost count: %d\n", |
101998f6 NB |
2146 | tpg->tv_tpg_vhost_count); |
2147 | return -EBUSY; | |
057cbf49 NB |
2148 | } |
2149 | ||
101998f6 | 2150 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
1a1ff825 | 2151 | " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport), |
057cbf49 | 2152 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
3aee26b4 | 2153 | |
057cbf49 | 2154 | /* |
101998f6 | 2155 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 | 2156 | */ |
25b88550 | 2157 | target_remove_session(se_sess); |
057cbf49 NB |
2158 | tpg->tpg_nexus = NULL; |
2159 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2160 | ||
2161 | kfree(tv_nexus); | |
2162 | return 0; | |
2163 | } | |
2164 | ||
2eafd729 | 2165 | static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page) |
057cbf49 | 2166 | { |
2eafd729 | 2167 | struct se_portal_group *se_tpg = to_tpg(item); |
1a1ff825 NB |
2168 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2169 | struct vhost_scsi_tpg, se_tpg); | |
2170 | struct vhost_scsi_nexus *tv_nexus; | |
057cbf49 NB |
2171 | ssize_t ret; |
2172 | ||
98718312 AH |
2173 | mutex_lock(&tpg->tv_tpg_mutex); |
2174 | tv_nexus = tpg->tpg_nexus; | |
057cbf49 | 2175 | if (!tv_nexus) { |
98718312 | 2176 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2177 | return -ENODEV; |
2178 | } | |
b3d4f02e | 2179 | ret = sysfs_emit(page, "%s\n", |
057cbf49 | 2180 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
98718312 | 2181 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2182 | |
2183 | return ret; | |
2184 | } | |
2185 | ||
2eafd729 CH |
2186 | static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item, |
2187 | const char *page, size_t count) | |
057cbf49 | 2188 | { |
2eafd729 | 2189 | struct se_portal_group *se_tpg = to_tpg(item); |
1a1ff825 NB |
2190 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2191 | struct vhost_scsi_tpg, se_tpg); | |
2192 | struct vhost_scsi_tport *tport_wwn = tpg->tport; | |
2193 | unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr; | |
057cbf49 NB |
2194 | int ret; |
2195 | /* | |
2196 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
2197 | */ | |
2198 | if (!strncmp(page, "NULL", 4)) { | |
1a1ff825 | 2199 | ret = vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
2200 | return (!ret) ? count : ret; |
2201 | } | |
2202 | /* | |
2203 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1a1ff825 NB |
2204 | * the fabric protocol_id set in vhost_scsi_make_tport(), and call |
2205 | * vhost_scsi_make_nexus(). | |
057cbf49 | 2206 | */ |
1a1ff825 | 2207 | if (strlen(page) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2208 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
1a1ff825 | 2209 | " max: %d\n", page, VHOST_SCSI_NAMELEN); |
057cbf49 NB |
2210 | return -EINVAL; |
2211 | } | |
1a1ff825 | 2212 | snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page); |
057cbf49 NB |
2213 | |
2214 | ptr = strstr(i_port, "naa."); | |
2215 | if (ptr) { | |
2216 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
2217 | pr_err("Passed SAS Initiator Port %s does not" | |
2218 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2219 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2220 | return -EINVAL; |
2221 | } | |
2222 | port_ptr = &i_port[0]; | |
2223 | goto check_newline; | |
2224 | } | |
2225 | ptr = strstr(i_port, "fc."); | |
2226 | if (ptr) { | |
2227 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
2228 | pr_err("Passed FCP Initiator Port %s does not" | |
2229 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2230 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2231 | return -EINVAL; |
2232 | } | |
2233 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
2234 | goto check_newline; | |
2235 | } | |
2236 | ptr = strstr(i_port, "iqn."); | |
2237 | if (ptr) { | |
2238 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
2239 | pr_err("Passed iSCSI Initiator Port %s does not" | |
2240 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2241 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2242 | return -EINVAL; |
2243 | } | |
2244 | port_ptr = &i_port[0]; | |
2245 | goto check_newline; | |
2246 | } | |
2247 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
2248 | " %s\n", i_port); | |
2249 | return -EINVAL; | |
2250 | /* | |
2251 | * Clear any trailing newline for the NAA WWN | |
2252 | */ | |
2253 | check_newline: | |
2254 | if (i_port[strlen(i_port)-1] == '\n') | |
2255 | i_port[strlen(i_port)-1] = '\0'; | |
2256 | ||
1a1ff825 | 2257 | ret = vhost_scsi_make_nexus(tpg, port_ptr); |
057cbf49 NB |
2258 | if (ret < 0) |
2259 | return ret; | |
2260 | ||
2261 | return count; | |
2262 | } | |
2263 | ||
2eafd729 | 2264 | CONFIGFS_ATTR(vhost_scsi_tpg_, nexus); |
057cbf49 | 2265 | |
1a1ff825 | 2266 | static struct configfs_attribute *vhost_scsi_tpg_attrs[] = { |
2eafd729 | 2267 | &vhost_scsi_tpg_attr_nexus, |
057cbf49 NB |
2268 | NULL, |
2269 | }; | |
2270 | ||
683bd967 | 2271 | static struct se_portal_group * |
aa090eab | 2272 | vhost_scsi_make_tpg(struct se_wwn *wwn, const char *name) |
057cbf49 | 2273 | { |
1a1ff825 NB |
2274 | struct vhost_scsi_tport *tport = container_of(wwn, |
2275 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 | 2276 | |
1a1ff825 | 2277 | struct vhost_scsi_tpg *tpg; |
59c816c1 | 2278 | u16 tpgt; |
057cbf49 NB |
2279 | int ret; |
2280 | ||
2281 | if (strstr(name, "tpgt_") != name) | |
2282 | return ERR_PTR(-EINVAL); | |
59c816c1 | 2283 | if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET) |
057cbf49 NB |
2284 | return ERR_PTR(-EINVAL); |
2285 | ||
473f0b15 | 2286 | tpg = kzalloc(sizeof(*tpg), GFP_KERNEL); |
057cbf49 | 2287 | if (!tpg) { |
1a1ff825 | 2288 | pr_err("Unable to allocate struct vhost_scsi_tpg"); |
057cbf49 NB |
2289 | return ERR_PTR(-ENOMEM); |
2290 | } | |
2291 | mutex_init(&tpg->tv_tpg_mutex); | |
2292 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
2293 | tpg->tport = tport; | |
2294 | tpg->tport_tpgt = tpgt; | |
2295 | ||
bc0c94b1 | 2296 | ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id); |
057cbf49 NB |
2297 | if (ret < 0) { |
2298 | kfree(tpg); | |
2299 | return NULL; | |
2300 | } | |
1a1ff825 NB |
2301 | mutex_lock(&vhost_scsi_mutex); |
2302 | list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list); | |
2303 | mutex_unlock(&vhost_scsi_mutex); | |
057cbf49 NB |
2304 | |
2305 | return &tpg->se_tpg; | |
2306 | } | |
2307 | ||
1a1ff825 | 2308 | static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg) |
057cbf49 | 2309 | { |
1a1ff825 NB |
2310 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2311 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 2312 | |
1a1ff825 | 2313 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 2314 | list_del(&tpg->tv_tpg_list); |
1a1ff825 | 2315 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 2316 | /* |
101998f6 | 2317 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 | 2318 | */ |
1a1ff825 | 2319 | vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
2320 | /* |
2321 | * Deregister the se_tpg from TCM.. | |
2322 | */ | |
2323 | core_tpg_deregister(se_tpg); | |
2324 | kfree(tpg); | |
2325 | } | |
2326 | ||
683bd967 | 2327 | static struct se_wwn * |
1a1ff825 | 2328 | vhost_scsi_make_tport(struct target_fabric_configfs *tf, |
683bd967 AH |
2329 | struct config_group *group, |
2330 | const char *name) | |
057cbf49 | 2331 | { |
1a1ff825 | 2332 | struct vhost_scsi_tport *tport; |
057cbf49 NB |
2333 | char *ptr; |
2334 | u64 wwpn = 0; | |
2335 | int off = 0; | |
2336 | ||
1a1ff825 | 2337 | /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0) |
057cbf49 NB |
2338 | return ERR_PTR(-EINVAL); */ |
2339 | ||
473f0b15 | 2340 | tport = kzalloc(sizeof(*tport), GFP_KERNEL); |
057cbf49 | 2341 | if (!tport) { |
1a1ff825 | 2342 | pr_err("Unable to allocate struct vhost_scsi_tport"); |
057cbf49 NB |
2343 | return ERR_PTR(-ENOMEM); |
2344 | } | |
2345 | tport->tport_wwpn = wwpn; | |
2346 | /* | |
2347 | * Determine the emulated Protocol Identifier and Target Port Name | |
2348 | * based on the incoming configfs directory name. | |
2349 | */ | |
2350 | ptr = strstr(name, "naa."); | |
2351 | if (ptr) { | |
2352 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
2353 | goto check_len; | |
2354 | } | |
2355 | ptr = strstr(name, "fc."); | |
2356 | if (ptr) { | |
2357 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
2358 | off = 3; /* Skip over "fc." */ | |
2359 | goto check_len; | |
2360 | } | |
2361 | ptr = strstr(name, "iqn."); | |
2362 | if (ptr) { | |
2363 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
2364 | goto check_len; | |
2365 | } | |
2366 | ||
2367 | pr_err("Unable to locate prefix for emulated Target Port:" | |
2368 | " %s\n", name); | |
2369 | kfree(tport); | |
2370 | return ERR_PTR(-EINVAL); | |
2371 | ||
2372 | check_len: | |
1a1ff825 | 2373 | if (strlen(name) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2374 | pr_err("Emulated %s Address: %s, exceeds" |
1a1ff825 NB |
2375 | " max: %d\n", name, vhost_scsi_dump_proto_id(tport), |
2376 | VHOST_SCSI_NAMELEN); | |
057cbf49 NB |
2377 | kfree(tport); |
2378 | return ERR_PTR(-EINVAL); | |
2379 | } | |
1a1ff825 | 2380 | snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]); |
057cbf49 NB |
2381 | |
2382 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
1a1ff825 | 2383 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name); |
057cbf49 NB |
2384 | |
2385 | return &tport->tport_wwn; | |
2386 | } | |
2387 | ||
1a1ff825 | 2388 | static void vhost_scsi_drop_tport(struct se_wwn *wwn) |
057cbf49 | 2389 | { |
1a1ff825 NB |
2390 | struct vhost_scsi_tport *tport = container_of(wwn, |
2391 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 NB |
2392 | |
2393 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
1a1ff825 | 2394 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), |
057cbf49 NB |
2395 | tport->tport_name); |
2396 | ||
2397 | kfree(tport); | |
2398 | } | |
2399 | ||
683bd967 | 2400 | static ssize_t |
2eafd729 | 2401 | vhost_scsi_wwn_version_show(struct config_item *item, char *page) |
057cbf49 | 2402 | { |
b3d4f02e | 2403 | return sysfs_emit(page, "TCM_VHOST fabric module %s on %s/%s" |
1a1ff825 | 2404 | "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 NB |
2405 | utsname()->machine); |
2406 | } | |
2407 | ||
2eafd729 | 2408 | CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version); |
057cbf49 | 2409 | |
1a1ff825 | 2410 | static struct configfs_attribute *vhost_scsi_wwn_attrs[] = { |
2eafd729 | 2411 | &vhost_scsi_wwn_attr_version, |
057cbf49 NB |
2412 | NULL, |
2413 | }; | |
2414 | ||
1d822a40 | 2415 | static const struct target_core_fabric_ops vhost_scsi_ops = { |
9ac8928e | 2416 | .module = THIS_MODULE, |
30c7ca93 | 2417 | .fabric_name = "vhost", |
5ae6a6a9 | 2418 | .max_data_sg_nents = VHOST_SCSI_PREALLOC_SGLS, |
1a1ff825 NB |
2419 | .tpg_get_wwn = vhost_scsi_get_fabric_wwn, |
2420 | .tpg_get_tag = vhost_scsi_get_tpgt, | |
1a1ff825 NB |
2421 | .tpg_check_demo_mode = vhost_scsi_check_true, |
2422 | .tpg_check_demo_mode_cache = vhost_scsi_check_true, | |
b1d75fe5 | 2423 | .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only, |
1a1ff825 | 2424 | .release_cmd = vhost_scsi_release_cmd, |
084ed45b | 2425 | .check_stop_free = vhost_scsi_check_stop_free, |
057cbf49 | 2426 | .sess_get_initiator_sid = NULL, |
1a1ff825 | 2427 | .write_pending = vhost_scsi_write_pending, |
1a1ff825 NB |
2428 | .queue_data_in = vhost_scsi_queue_data_in, |
2429 | .queue_status = vhost_scsi_queue_status, | |
2430 | .queue_tm_rsp = vhost_scsi_queue_tm_rsp, | |
2431 | .aborted_task = vhost_scsi_aborted_task, | |
057cbf49 NB |
2432 | /* |
2433 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
2434 | */ | |
1a1ff825 NB |
2435 | .fabric_make_wwn = vhost_scsi_make_tport, |
2436 | .fabric_drop_wwn = vhost_scsi_drop_tport, | |
2437 | .fabric_make_tpg = vhost_scsi_make_tpg, | |
2438 | .fabric_drop_tpg = vhost_scsi_drop_tpg, | |
2439 | .fabric_post_link = vhost_scsi_port_link, | |
2440 | .fabric_pre_unlink = vhost_scsi_port_unlink, | |
9ac8928e CH |
2441 | |
2442 | .tfc_wwn_attrs = vhost_scsi_wwn_attrs, | |
2443 | .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs, | |
2444 | .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs, | |
057cbf49 NB |
2445 | }; |
2446 | ||
9ac8928e | 2447 | static int __init vhost_scsi_init(void) |
057cbf49 | 2448 | { |
9ac8928e | 2449 | int ret = -ENOMEM; |
057cbf49 | 2450 | |
9ac8928e | 2451 | pr_debug("TCM_VHOST fabric module %s on %s/%s" |
1a1ff825 | 2452 | " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 | 2453 | utsname()->machine); |
057cbf49 | 2454 | |
057cbf49 NB |
2455 | ret = vhost_scsi_register(); |
2456 | if (ret < 0) | |
6ec29cb8 | 2457 | goto out; |
057cbf49 | 2458 | |
9ac8928e | 2459 | ret = target_register_template(&vhost_scsi_ops); |
057cbf49 NB |
2460 | if (ret < 0) |
2461 | goto out_vhost_scsi_deregister; | |
2462 | ||
2463 | return 0; | |
2464 | ||
2465 | out_vhost_scsi_deregister: | |
2466 | vhost_scsi_deregister(); | |
057cbf49 NB |
2467 | out: |
2468 | return ret; | |
2469 | }; | |
2470 | ||
1a1ff825 | 2471 | static void vhost_scsi_exit(void) |
057cbf49 | 2472 | { |
9ac8928e | 2473 | target_unregister_template(&vhost_scsi_ops); |
057cbf49 | 2474 | vhost_scsi_deregister(); |
057cbf49 NB |
2475 | }; |
2476 | ||
181c04a3 MT |
2477 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
2478 | MODULE_ALIAS("tcm_vhost"); | |
057cbf49 | 2479 | MODULE_LICENSE("GPL"); |
1a1ff825 NB |
2480 | module_init(vhost_scsi_init); |
2481 | module_exit(vhost_scsi_exit); |