Commit | Line | Data |
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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 */ |
a77ec83a | 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; | |
efd838fe | 128 | struct list_head tmf_queue; |
5012a3a3 MT |
129 | }; |
130 | ||
1a1ff825 | 131 | struct vhost_scsi_tport { |
5012a3a3 MT |
132 | /* SCSI protocol the tport is providing */ |
133 | u8 tport_proto_id; | |
134 | /* Binary World Wide unique Port Name for Vhost Target port */ | |
135 | u64 tport_wwpn; | |
136 | /* ASCII formatted WWPN for Vhost Target port */ | |
1a1ff825 NB |
137 | char tport_name[VHOST_SCSI_NAMELEN]; |
138 | /* Returned by vhost_scsi_make_tport() */ | |
5012a3a3 MT |
139 | struct se_wwn tport_wwn; |
140 | }; | |
141 | ||
1a1ff825 | 142 | struct vhost_scsi_evt { |
5012a3a3 MT |
143 | /* event to be sent to guest */ |
144 | struct virtio_scsi_event event; | |
145 | /* event list, serviced from vhost worker thread */ | |
146 | struct llist_node list; | |
147 | }; | |
057cbf49 | 148 | |
101998f6 NB |
149 | enum { |
150 | VHOST_SCSI_VQ_CTL = 0, | |
151 | VHOST_SCSI_VQ_EVT = 1, | |
152 | VHOST_SCSI_VQ_IO = 2, | |
153 | }; | |
154 | ||
e72fd72e | 155 | /* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */ |
5dade710 | 156 | enum { |
95e7c434 | 157 | VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) | |
4e9fa50c | 158 | (1ULL << VIRTIO_SCSI_F_T10_PI) |
5dade710 NB |
159 | }; |
160 | ||
1b7f390e | 161 | #define VHOST_SCSI_MAX_TARGET 256 |
f49c2226 | 162 | #define VHOST_SCSI_MAX_IO_VQ 1024 |
a6c9af87 | 163 | #define VHOST_SCSI_MAX_EVENT 128 |
67e18cf9 | 164 | |
f49c2226 MC |
165 | static unsigned vhost_scsi_max_io_vqs = 128; |
166 | module_param_named(max_io_vqs, vhost_scsi_max_io_vqs, uint, 0644); | |
167 | 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."); | |
168 | ||
3ab2e420 AH |
169 | struct vhost_scsi_virtqueue { |
170 | struct vhost_virtqueue vq; | |
3dfbff32 MT |
171 | /* |
172 | * Reference counting for inflight reqs, used for flush operation. At | |
173 | * each time, one reference tracks new commands submitted, while we | |
174 | * wait for another one to reach 0. | |
175 | */ | |
f2f0173d | 176 | struct vhost_scsi_inflight inflights[2]; |
3dfbff32 MT |
177 | /* |
178 | * Indicate current inflight in use, protected by vq->mutex. | |
179 | * Writers must also take dev mutex and flush under it. | |
180 | */ | |
f2f0173d | 181 | int inflight_idx; |
25b98b64 MC |
182 | struct vhost_scsi_cmd *scsi_cmds; |
183 | struct sbitmap scsi_tags; | |
184 | int max_cmds; | |
3ab2e420 AH |
185 | }; |
186 | ||
057cbf49 | 187 | struct vhost_scsi { |
67e18cf9 | 188 | /* Protected by vhost_scsi->dev.mutex */ |
1a1ff825 | 189 | struct vhost_scsi_tpg **vs_tpg; |
67e18cf9 | 190 | char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
67e18cf9 | 191 | |
057cbf49 | 192 | struct vhost_dev dev; |
f49c2226 MC |
193 | struct vhost_scsi_virtqueue *vqs; |
194 | unsigned long *compl_bitmap; | |
195 | struct vhost_scsi_inflight **old_inflight; | |
057cbf49 NB |
196 | |
197 | struct vhost_work vs_completion_work; /* cmd completion work item */ | |
9d6064a3 | 198 | struct llist_head vs_completion_list; /* cmd completion queue */ |
a6c9af87 AH |
199 | |
200 | struct vhost_work vs_event_work; /* evt injection work item */ | |
201 | struct llist_head vs_event_list; /* evt injection queue */ | |
202 | ||
203 | bool vs_events_missed; /* any missed events, protected by vq->mutex */ | |
204 | int vs_events_nr; /* num of pending events, protected by vq->mutex */ | |
057cbf49 NB |
205 | }; |
206 | ||
efd838fe MC |
207 | struct vhost_scsi_tmf { |
208 | struct vhost_work vwork; | |
209 | struct vhost_scsi_tpg *tpg; | |
210 | struct vhost_scsi *vhost; | |
211 | struct vhost_scsi_virtqueue *svq; | |
212 | struct list_head queue_entry; | |
213 | ||
214 | struct se_cmd se_cmd; | |
b4fffc17 | 215 | u8 scsi_resp; |
efd838fe MC |
216 | struct vhost_scsi_inflight *inflight; |
217 | struct iovec resp_iov; | |
218 | int in_iovs; | |
219 | int vq_desc; | |
220 | }; | |
221 | ||
3f8ca2e1 BM |
222 | /* |
223 | * Context for processing request and control queue operations. | |
224 | */ | |
225 | struct vhost_scsi_ctx { | |
226 | int head; | |
227 | unsigned int out, in; | |
228 | size_t req_size, rsp_size; | |
229 | size_t out_size, in_size; | |
230 | u8 *target, *lunp; | |
231 | void *req; | |
232 | struct iov_iter out_iter; | |
233 | }; | |
234 | ||
1a1ff825 NB |
235 | /* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */ |
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 int vhost_scsi_check_false(struct se_portal_group *se_tpg) |
057cbf49 NB |
298 | { |
299 | return 0; | |
300 | } | |
301 | ||
1a1ff825 | 302 | static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg) |
057cbf49 | 303 | { |
1a1ff825 NB |
304 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
305 | struct vhost_scsi_tpg, se_tpg); | |
306 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
307 | |
308 | return &tport->tport_name[0]; | |
309 | } | |
310 | ||
1a1ff825 | 311 | static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg) |
057cbf49 | 312 | { |
1a1ff825 NB |
313 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
314 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 NB |
315 | return tpg->tport_tpgt; |
316 | } | |
317 | ||
b1d75fe5 NB |
318 | static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg) |
319 | { | |
320 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, | |
321 | struct vhost_scsi_tpg, se_tpg); | |
322 | ||
323 | return tpg->tv_fabric_prot_type; | |
324 | } | |
325 | ||
1a1ff825 | 326 | static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg) |
057cbf49 NB |
327 | { |
328 | return 1; | |
329 | } | |
330 | ||
47a3565e | 331 | static void vhost_scsi_release_cmd_res(struct se_cmd *se_cmd) |
057cbf49 | 332 | { |
1a1ff825 NB |
333 | struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd, |
334 | struct vhost_scsi_cmd, tvc_se_cmd); | |
25b98b64 MC |
335 | struct vhost_scsi_virtqueue *svq = container_of(tv_cmd->tvc_vq, |
336 | struct vhost_scsi_virtqueue, vq); | |
337 | struct vhost_scsi_inflight *inflight = tv_cmd->inflight; | |
e31885dd | 338 | int i; |
084ed45b NB |
339 | |
340 | if (tv_cmd->tvc_sgl_count) { | |
084ed45b NB |
341 | for (i = 0; i < tv_cmd->tvc_sgl_count; i++) |
342 | put_page(sg_page(&tv_cmd->tvc_sgl[i])); | |
d3d665a6 | 343 | } |
e31885dd NB |
344 | if (tv_cmd->tvc_prot_sgl_count) { |
345 | for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++) | |
346 | put_page(sg_page(&tv_cmd->tvc_prot_sgl[i])); | |
347 | } | |
084ed45b | 348 | |
25b98b64 MC |
349 | sbitmap_clear_bit(&svq->scsi_tags, se_cmd->map_tag); |
350 | vhost_scsi_put_inflight(inflight); | |
057cbf49 NB |
351 | } |
352 | ||
efd838fe MC |
353 | static void vhost_scsi_release_tmf_res(struct vhost_scsi_tmf *tmf) |
354 | { | |
355 | struct vhost_scsi_tpg *tpg = tmf->tpg; | |
356 | struct vhost_scsi_inflight *inflight = tmf->inflight; | |
357 | ||
358 | mutex_lock(&tpg->tv_tpg_mutex); | |
359 | list_add_tail(&tpg->tmf_queue, &tmf->queue_entry); | |
360 | mutex_unlock(&tpg->tv_tpg_mutex); | |
361 | vhost_scsi_put_inflight(inflight); | |
362 | } | |
363 | ||
47a3565e MC |
364 | static void vhost_scsi_release_cmd(struct se_cmd *se_cmd) |
365 | { | |
efd838fe MC |
366 | if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) { |
367 | struct vhost_scsi_tmf *tmf = container_of(se_cmd, | |
368 | struct vhost_scsi_tmf, se_cmd); | |
369 | ||
370 | vhost_work_queue(&tmf->vhost->dev, &tmf->vwork); | |
371 | } else { | |
372 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, | |
47a3565e | 373 | struct vhost_scsi_cmd, tvc_se_cmd); |
efd838fe | 374 | struct vhost_scsi *vs = cmd->tvc_vhost; |
47a3565e | 375 | |
efd838fe MC |
376 | llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
377 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
378 | } | |
47a3565e MC |
379 | } |
380 | ||
1a1ff825 | 381 | static u32 vhost_scsi_sess_get_index(struct se_session *se_sess) |
057cbf49 NB |
382 | { |
383 | return 0; | |
384 | } | |
385 | ||
1a1ff825 | 386 | static int vhost_scsi_write_pending(struct se_cmd *se_cmd) |
057cbf49 NB |
387 | { |
388 | /* Go ahead and process the write immediately */ | |
389 | target_execute_cmd(se_cmd); | |
390 | return 0; | |
391 | } | |
392 | ||
1a1ff825 | 393 | static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl) |
057cbf49 NB |
394 | { |
395 | return; | |
396 | } | |
397 | ||
1a1ff825 | 398 | static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd) |
057cbf49 NB |
399 | { |
400 | return 0; | |
401 | } | |
402 | ||
1a1ff825 | 403 | static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd) |
057cbf49 | 404 | { |
47a3565e | 405 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 NB |
406 | return 0; |
407 | } | |
408 | ||
1a1ff825 | 409 | static int vhost_scsi_queue_status(struct se_cmd *se_cmd) |
057cbf49 | 410 | { |
47a3565e | 411 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 NB |
412 | return 0; |
413 | } | |
414 | ||
1a1ff825 | 415 | static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd) |
057cbf49 | 416 | { |
efd838fe MC |
417 | struct vhost_scsi_tmf *tmf = container_of(se_cmd, struct vhost_scsi_tmf, |
418 | se_cmd); | |
419 | ||
b4fffc17 | 420 | tmf->scsi_resp = se_cmd->se_tmr_req->response; |
efd838fe | 421 | transport_generic_free_cmd(&tmf->se_cmd, 0); |
057cbf49 NB |
422 | } |
423 | ||
1a1ff825 | 424 | static void vhost_scsi_aborted_task(struct se_cmd *se_cmd) |
131e6abc NB |
425 | { |
426 | return; | |
427 | } | |
428 | ||
1a1ff825 | 429 | static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 AH |
430 | { |
431 | vs->vs_events_nr--; | |
432 | kfree(evt); | |
433 | } | |
434 | ||
1a1ff825 NB |
435 | static struct vhost_scsi_evt * |
436 | vhost_scsi_allocate_evt(struct vhost_scsi *vs, | |
683bd967 | 437 | u32 event, u32 reason) |
a6c9af87 | 438 | { |
3ab2e420 | 439 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
1a1ff825 | 440 | struct vhost_scsi_evt *evt; |
a6c9af87 AH |
441 | |
442 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
443 | vs->vs_events_missed = true; | |
444 | return NULL; | |
445 | } | |
446 | ||
447 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
448 | if (!evt) { | |
1a1ff825 | 449 | vq_err(vq, "Failed to allocate vhost_scsi_evt\n"); |
a6c9af87 AH |
450 | vs->vs_events_missed = true; |
451 | return NULL; | |
452 | } | |
453 | ||
e72fd72e MT |
454 | evt->event.event = cpu_to_vhost32(vq, event); |
455 | evt->event.reason = cpu_to_vhost32(vq, reason); | |
a6c9af87 AH |
456 | vs->vs_events_nr++; |
457 | ||
458 | return evt; | |
459 | } | |
460 | ||
084ed45b NB |
461 | static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) |
462 | { | |
afc16604 | 463 | return target_put_sess_cmd(se_cmd); |
057cbf49 NB |
464 | } |
465 | ||
683bd967 | 466 | static void |
1a1ff825 | 467 | vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 | 468 | { |
3ab2e420 | 469 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
470 | struct virtio_scsi_event *event = &evt->event; |
471 | struct virtio_scsi_event __user *eventp; | |
472 | unsigned out, in; | |
473 | int head, ret; | |
474 | ||
247643f8 | 475 | if (!vhost_vq_get_backend(vq)) { |
a6c9af87 AH |
476 | vs->vs_events_missed = true; |
477 | return; | |
478 | } | |
479 | ||
480 | again: | |
481 | vhost_disable_notify(&vs->dev, vq); | |
47283bef | 482 | head = vhost_get_vq_desc(vq, vq->iov, |
a6c9af87 AH |
483 | ARRAY_SIZE(vq->iov), &out, &in, |
484 | NULL, NULL); | |
485 | if (head < 0) { | |
486 | vs->vs_events_missed = true; | |
487 | return; | |
488 | } | |
489 | if (head == vq->num) { | |
490 | if (vhost_enable_notify(&vs->dev, vq)) | |
491 | goto again; | |
492 | vs->vs_events_missed = true; | |
493 | return; | |
494 | } | |
495 | ||
496 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { | |
497 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", | |
498 | vq->iov[out].iov_len); | |
499 | vs->vs_events_missed = true; | |
500 | return; | |
501 | } | |
502 | ||
503 | if (vs->vs_events_missed) { | |
e72fd72e | 504 | event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED); |
a6c9af87 AH |
505 | vs->vs_events_missed = false; |
506 | } | |
507 | ||
508 | eventp = vq->iov[out].iov_base; | |
509 | ret = __copy_to_user(eventp, event, sizeof(*event)); | |
510 | if (!ret) | |
511 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
512 | else | |
1a1ff825 | 513 | vq_err(vq, "Faulted on vhost_scsi_send_event\n"); |
a6c9af87 AH |
514 | } |
515 | ||
1a1ff825 | 516 | static void vhost_scsi_evt_work(struct vhost_work *work) |
a6c9af87 AH |
517 | { |
518 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
519 | vs_event_work); | |
3ab2e420 | 520 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
12bdcbd5 | 521 | struct vhost_scsi_evt *evt, *t; |
a6c9af87 AH |
522 | struct llist_node *llnode; |
523 | ||
524 | mutex_lock(&vq->mutex); | |
525 | llnode = llist_del_all(&vs->vs_event_list); | |
12bdcbd5 | 526 | llist_for_each_entry_safe(evt, t, llnode, list) { |
1a1ff825 NB |
527 | vhost_scsi_do_evt_work(vs, evt); |
528 | vhost_scsi_free_evt(vs, evt); | |
a6c9af87 AH |
529 | } |
530 | mutex_unlock(&vq->mutex); | |
531 | } | |
532 | ||
057cbf49 NB |
533 | /* Fill in status and signal that we are done processing this command |
534 | * | |
535 | * This is scheduled in the vhost work queue so we are called with the owner | |
536 | * process mm and can access the vring. | |
537 | */ | |
538 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) | |
539 | { | |
540 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
541 | vs_completion_work); | |
9d6064a3 | 542 | struct virtio_scsi_cmd_resp v_rsp; |
816e85ed | 543 | struct vhost_scsi_cmd *cmd, *t; |
9d6064a3 AH |
544 | struct llist_node *llnode; |
545 | struct se_cmd *se_cmd; | |
79c14141 | 546 | struct iov_iter iov_iter; |
1b7f390e | 547 | int ret, vq; |
057cbf49 | 548 | |
f49c2226 | 549 | bitmap_zero(vs->compl_bitmap, vs->dev.nvqs); |
9d6064a3 | 550 | llnode = llist_del_all(&vs->vs_completion_list); |
816e85ed | 551 | llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) { |
3c63f66a | 552 | se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
553 | |
554 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
3c63f66a | 555 | cmd, se_cmd->residual_count, se_cmd->scsi_status); |
057cbf49 NB |
556 | |
557 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
e72fd72e | 558 | v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count); |
057cbf49 NB |
559 | /* TODO is status_qualifier field needed? */ |
560 | v_rsp.status = se_cmd->scsi_status; | |
e72fd72e MT |
561 | v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq, |
562 | se_cmd->scsi_sense_length); | |
3c63f66a | 563 | memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
e72fd72e | 564 | se_cmd->scsi_sense_length); |
79c14141 | 565 | |
a77ec83a | 566 | iov_iter_init(&iov_iter, READ, &cmd->tvc_resp_iov, |
79c14141 NB |
567 | cmd->tvc_in_iovs, sizeof(v_rsp)); |
568 | ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter); | |
569 | if (likely(ret == sizeof(v_rsp))) { | |
3ab2e420 | 570 | struct vhost_scsi_virtqueue *q; |
3c63f66a AH |
571 | vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
572 | q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); | |
3ab2e420 | 573 | vq = q - vs->vqs; |
f49c2226 | 574 | __set_bit(vq, vs->compl_bitmap); |
1b7f390e | 575 | } else |
057cbf49 NB |
576 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
577 | ||
47a3565e | 578 | vhost_scsi_release_cmd_res(se_cmd); |
057cbf49 NB |
579 | } |
580 | ||
1b7f390e | 581 | vq = -1; |
f49c2226 MC |
582 | while ((vq = find_next_bit(vs->compl_bitmap, vs->dev.nvqs, vq + 1)) |
583 | < vs->dev.nvqs) | |
3ab2e420 | 584 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
585 | } |
586 | ||
1a1ff825 | 587 | static struct vhost_scsi_cmd * |
25b98b64 | 588 | vhost_scsi_get_cmd(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg, |
95e7c434 NB |
589 | unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr, |
590 | u32 exp_data_len, int data_direction) | |
057cbf49 | 591 | { |
25b98b64 MC |
592 | struct vhost_scsi_virtqueue *svq = container_of(vq, |
593 | struct vhost_scsi_virtqueue, vq); | |
1a1ff825 NB |
594 | struct vhost_scsi_cmd *cmd; |
595 | struct vhost_scsi_nexus *tv_nexus; | |
b1935f68 | 596 | struct scatterlist *sg, *prot_sg; |
3aee26b4 | 597 | struct page **pages; |
25b98b64 | 598 | int tag; |
057cbf49 | 599 | |
98718312 | 600 | tv_nexus = tpg->tpg_nexus; |
057cbf49 | 601 | if (!tv_nexus) { |
1a1ff825 | 602 | pr_err("Unable to locate active struct vhost_scsi_nexus\n"); |
057cbf49 NB |
603 | return ERR_PTR(-EIO); |
604 | } | |
057cbf49 | 605 | |
c548e62b | 606 | tag = sbitmap_get(&svq->scsi_tags); |
4a47d3a1 | 607 | if (tag < 0) { |
1a1ff825 | 608 | pr_err("Unable to obtain tag for vhost_scsi_cmd\n"); |
4a47d3a1 NB |
609 | return ERR_PTR(-ENOMEM); |
610 | } | |
611 | ||
25b98b64 | 612 | cmd = &svq->scsi_cmds[tag]; |
3aee26b4 | 613 | sg = cmd->tvc_sgl; |
b1935f68 | 614 | prot_sg = cmd->tvc_prot_sgl; |
3aee26b4 | 615 | pages = cmd->tvc_upages; |
473f0b15 | 616 | memset(cmd, 0, sizeof(*cmd)); |
3aee26b4 | 617 | cmd->tvc_sgl = sg; |
b1935f68 | 618 | cmd->tvc_prot_sgl = prot_sg; |
3aee26b4 | 619 | cmd->tvc_upages = pages; |
4824d3bf | 620 | cmd->tvc_se_cmd.map_tag = tag; |
95e7c434 NB |
621 | cmd->tvc_tag = scsi_tag; |
622 | cmd->tvc_lun = lun; | |
623 | cmd->tvc_task_attr = task_attr; | |
3c63f66a AH |
624 | cmd->tvc_exp_data_len = exp_data_len; |
625 | cmd->tvc_data_direction = data_direction; | |
626 | cmd->tvc_nexus = tv_nexus; | |
1a1ff825 | 627 | cmd->inflight = vhost_scsi_get_inflight(vq); |
3c63f66a | 628 | |
1a1ff825 | 629 | memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE); |
95e7c434 | 630 | |
3c63f66a | 631 | return cmd; |
057cbf49 NB |
632 | } |
633 | ||
634 | /* | |
635 | * Map a user memory range into a scatterlist | |
636 | * | |
637 | * Returns the number of scatterlist entries used or -errno on error. | |
638 | */ | |
683bd967 | 639 | static int |
1a1ff825 | 640 | vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd, |
2f240c4a | 641 | struct iov_iter *iter, |
3aee26b4 | 642 | struct scatterlist *sgl, |
5a01d082 | 643 | bool write) |
057cbf49 | 644 | { |
b4078b5f | 645 | struct page **pages = cmd->tvc_upages; |
2f240c4a AV |
646 | struct scatterlist *sg = sgl; |
647 | ssize_t bytes; | |
648 | size_t offset; | |
649 | unsigned int npages = 0; | |
3aee26b4 | 650 | |
1ef255e2 | 651 | bytes = iov_iter_get_pages2(iter, pages, LONG_MAX, |
2f240c4a | 652 | VHOST_SCSI_PREALLOC_UPAGES, &offset); |
1810053e | 653 | /* No pages were pinned */ |
2f240c4a AV |
654 | if (bytes <= 0) |
655 | return bytes < 0 ? bytes : -EFAULT; | |
1810053e | 656 | |
2f240c4a AV |
657 | while (bytes) { |
658 | unsigned n = min_t(unsigned, PAGE_SIZE - offset, bytes); | |
659 | sg_set_page(sg++, pages[npages++], n, offset); | |
660 | bytes -= n; | |
661 | offset = 0; | |
662 | } | |
663 | return npages; | |
057cbf49 NB |
664 | } |
665 | ||
683bd967 | 666 | static int |
e8de56b5 | 667 | vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls) |
057cbf49 | 668 | { |
e8de56b5 | 669 | int sgl_count = 0; |
057cbf49 | 670 | |
e8de56b5 NB |
671 | if (!iter || !iter->iov) { |
672 | pr_err("%s: iter->iov is NULL, but expected bytes: %zu" | |
673 | " present\n", __func__, bytes); | |
674 | return -EINVAL; | |
675 | } | |
f3158f36 | 676 | |
e8de56b5 NB |
677 | sgl_count = iov_iter_npages(iter, 0xffff); |
678 | if (sgl_count > max_sgls) { | |
679 | pr_err("%s: requested sgl_count: %d exceeds pre-allocated" | |
680 | " max_sgls: %d\n", __func__, sgl_count, max_sgls); | |
681 | return -EINVAL; | |
5a01d082 | 682 | } |
e8de56b5 NB |
683 | return sgl_count; |
684 | } | |
057cbf49 | 685 | |
e8de56b5 | 686 | static int |
1a1ff825 NB |
687 | vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write, |
688 | struct iov_iter *iter, | |
689 | struct scatterlist *sg, int sg_count) | |
e8de56b5 | 690 | { |
11d49e9d | 691 | struct scatterlist *p = sg; |
2f240c4a | 692 | int ret; |
5a01d082 | 693 | |
2f240c4a AV |
694 | while (iov_iter_count(iter)) { |
695 | ret = vhost_scsi_map_to_sgl(cmd, iter, sg, write); | |
057cbf49 | 696 | if (ret < 0) { |
11d49e9d AV |
697 | while (p < sg) { |
698 | struct page *page = sg_page(p++); | |
e8de56b5 NB |
699 | if (page) |
700 | put_page(page); | |
701 | } | |
057cbf49 NB |
702 | return ret; |
703 | } | |
057cbf49 | 704 | sg += ret; |
057cbf49 NB |
705 | } |
706 | return 0; | |
707 | } | |
708 | ||
e31885dd | 709 | static int |
1a1ff825 | 710 | vhost_scsi_mapal(struct vhost_scsi_cmd *cmd, |
e8de56b5 NB |
711 | size_t prot_bytes, struct iov_iter *prot_iter, |
712 | size_t data_bytes, struct iov_iter *data_iter) | |
713 | { | |
714 | int sgl_count, ret; | |
715 | bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE); | |
716 | ||
717 | if (prot_bytes) { | |
718 | sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes, | |
1a1ff825 | 719 | VHOST_SCSI_PREALLOC_PROT_SGLS); |
e8de56b5 NB |
720 | if (sgl_count < 0) |
721 | return sgl_count; | |
722 | ||
723 | sg_init_table(cmd->tvc_prot_sgl, sgl_count); | |
724 | cmd->tvc_prot_sgl_count = sgl_count; | |
725 | pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__, | |
726 | cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count); | |
727 | ||
728 | ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter, | |
729 | cmd->tvc_prot_sgl, | |
730 | cmd->tvc_prot_sgl_count); | |
e31885dd | 731 | if (ret < 0) { |
e31885dd NB |
732 | cmd->tvc_prot_sgl_count = 0; |
733 | return ret; | |
734 | } | |
e8de56b5 NB |
735 | } |
736 | sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes, | |
1a1ff825 | 737 | VHOST_SCSI_PREALLOC_SGLS); |
e8de56b5 NB |
738 | if (sgl_count < 0) |
739 | return sgl_count; | |
740 | ||
741 | sg_init_table(cmd->tvc_sgl, sgl_count); | |
742 | cmd->tvc_sgl_count = sgl_count; | |
743 | pr_debug("%s data_sg %p data_sgl_count %u\n", __func__, | |
744 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
745 | ||
746 | ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter, | |
747 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
748 | if (ret < 0) { | |
749 | cmd->tvc_sgl_count = 0; | |
750 | return ret; | |
e31885dd NB |
751 | } |
752 | return 0; | |
753 | } | |
754 | ||
46243860 NB |
755 | static int vhost_scsi_to_tcm_attr(int attr) |
756 | { | |
757 | switch (attr) { | |
758 | case VIRTIO_SCSI_S_SIMPLE: | |
759 | return TCM_SIMPLE_TAG; | |
760 | case VIRTIO_SCSI_S_ORDERED: | |
761 | return TCM_ORDERED_TAG; | |
762 | case VIRTIO_SCSI_S_HEAD: | |
763 | return TCM_HEAD_TAG; | |
764 | case VIRTIO_SCSI_S_ACA: | |
765 | return TCM_ACA_TAG; | |
766 | default: | |
767 | break; | |
768 | } | |
769 | return TCM_SIMPLE_TAG; | |
770 | } | |
771 | ||
6ec29cb8 | 772 | static void vhost_scsi_target_queue_cmd(struct vhost_scsi_cmd *cmd) |
057cbf49 | 773 | { |
3c63f66a | 774 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
6ec29cb8 | 775 | struct vhost_scsi_nexus *tv_nexus; |
95e7c434 | 776 | struct scatterlist *sg_ptr, *sg_prot_ptr = NULL; |
057cbf49 | 777 | |
95e7c434 | 778 | /* FIXME: BIDI operation */ |
3c63f66a AH |
779 | if (cmd->tvc_sgl_count) { |
780 | sg_ptr = cmd->tvc_sgl; | |
95e7c434 NB |
781 | |
782 | if (cmd->tvc_prot_sgl_count) | |
783 | sg_prot_ptr = cmd->tvc_prot_sgl; | |
784 | else | |
785 | se_cmd->prot_pto = true; | |
057cbf49 NB |
786 | } else { |
787 | sg_ptr = NULL; | |
788 | } | |
3c63f66a | 789 | tv_nexus = cmd->tvc_nexus; |
9f0abc15 | 790 | |
649ee054 | 791 | se_cmd->tag = 0; |
eb929804 | 792 | target_init_cmd(se_cmd, tv_nexus->tvn_se_sess, &cmd->tvc_sense_buf[0], |
3c63f66a | 793 | cmd->tvc_lun, cmd->tvc_exp_data_len, |
46243860 | 794 | vhost_scsi_to_tcm_attr(cmd->tvc_task_attr), |
eb929804 MC |
795 | cmd->tvc_data_direction, TARGET_SCF_ACK_KREF); |
796 | ||
797 | if (target_submit_prep(se_cmd, cmd->tvc_cdb, sg_ptr, | |
798 | cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr, | |
08694199 | 799 | cmd->tvc_prot_sgl_count, GFP_KERNEL)) |
eb929804 MC |
800 | return; |
801 | ||
6ec29cb8 | 802 | target_queue_submission(se_cmd); |
057cbf49 NB |
803 | } |
804 | ||
683bd967 AH |
805 | static void |
806 | vhost_scsi_send_bad_target(struct vhost_scsi *vs, | |
807 | struct vhost_virtqueue *vq, | |
808 | int head, unsigned out) | |
637ab21e AH |
809 | { |
810 | struct virtio_scsi_cmd_resp __user *resp; | |
811 | struct virtio_scsi_cmd_resp rsp; | |
812 | int ret; | |
813 | ||
814 | memset(&rsp, 0, sizeof(rsp)); | |
815 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
816 | resp = vq->iov[out].iov_base; | |
817 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
818 | if (!ret) | |
819 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
820 | else | |
821 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
822 | } | |
823 | ||
09d75832 BM |
824 | static int |
825 | vhost_scsi_get_desc(struct vhost_scsi *vs, struct vhost_virtqueue *vq, | |
826 | struct vhost_scsi_ctx *vc) | |
827 | { | |
828 | int ret = -ENXIO; | |
829 | ||
830 | vc->head = vhost_get_vq_desc(vq, vq->iov, | |
831 | ARRAY_SIZE(vq->iov), &vc->out, &vc->in, | |
832 | NULL, NULL); | |
833 | ||
834 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", | |
835 | vc->head, vc->out, vc->in); | |
836 | ||
837 | /* On error, stop handling until the next kick. */ | |
838 | if (unlikely(vc->head < 0)) | |
839 | goto done; | |
840 | ||
841 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
842 | if (vc->head == vq->num) { | |
843 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
844 | vhost_disable_notify(&vs->dev, vq); | |
845 | ret = -EAGAIN; | |
846 | } | |
847 | goto done; | |
848 | } | |
849 | ||
850 | /* | |
851 | * Get the size of request and response buffers. | |
852 | * FIXME: Not correct for BIDI operation | |
853 | */ | |
854 | vc->out_size = iov_length(vq->iov, vc->out); | |
855 | vc->in_size = iov_length(&vq->iov[vc->out], vc->in); | |
856 | ||
857 | /* | |
858 | * Copy over the virtio-scsi request header, which for a | |
859 | * ANY_LAYOUT enabled guest may span multiple iovecs, or a | |
860 | * single iovec may contain both the header + outgoing | |
861 | * WRITE payloads. | |
862 | * | |
863 | * copy_from_iter() will advance out_iter, so that it will | |
864 | * point at the start of the outgoing WRITE payload, if | |
865 | * DMA_TO_DEVICE is set. | |
866 | */ | |
867 | iov_iter_init(&vc->out_iter, WRITE, vq->iov, vc->out, vc->out_size); | |
868 | ret = 0; | |
869 | ||
870 | done: | |
871 | return ret; | |
872 | } | |
873 | ||
874 | static int | |
875 | vhost_scsi_chk_size(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc) | |
876 | { | |
877 | if (unlikely(vc->in_size < vc->rsp_size)) { | |
878 | vq_err(vq, | |
879 | "Response buf too small, need min %zu bytes got %zu", | |
880 | vc->rsp_size, vc->in_size); | |
881 | return -EINVAL; | |
882 | } else if (unlikely(vc->out_size < vc->req_size)) { | |
883 | vq_err(vq, | |
884 | "Request buf too small, need min %zu bytes got %zu", | |
885 | vc->req_size, vc->out_size); | |
886 | return -EIO; | |
887 | } | |
888 | ||
889 | return 0; | |
890 | } | |
891 | ||
892 | static int | |
893 | vhost_scsi_get_req(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc, | |
894 | struct vhost_scsi_tpg **tpgp) | |
895 | { | |
896 | int ret = -EIO; | |
897 | ||
898 | if (unlikely(!copy_from_iter_full(vc->req, vc->req_size, | |
899 | &vc->out_iter))) { | |
a691ffb4 | 900 | vq_err(vq, "Faulted on copy_from_iter_full\n"); |
09d75832 BM |
901 | } else if (unlikely(*vc->lunp != 1)) { |
902 | /* virtio-scsi spec requires byte 0 of the lun to be 1 */ | |
903 | vq_err(vq, "Illegal virtio-scsi lun: %u\n", *vc->lunp); | |
904 | } else { | |
905 | struct vhost_scsi_tpg **vs_tpg, *tpg; | |
906 | ||
247643f8 | 907 | vs_tpg = vhost_vq_get_backend(vq); /* validated at handler entry */ |
09d75832 BM |
908 | |
909 | tpg = READ_ONCE(vs_tpg[*vc->target]); | |
910 | if (unlikely(!tpg)) { | |
911 | vq_err(vq, "Target 0x%x does not exist\n", *vc->target); | |
912 | } else { | |
913 | if (tpgp) | |
914 | *tpgp = tpg; | |
915 | ret = 0; | |
916 | } | |
917 | } | |
918 | ||
919 | return ret; | |
920 | } | |
921 | ||
18f1becb MC |
922 | static u16 vhost_buf_to_lun(u8 *lun_buf) |
923 | { | |
924 | return ((lun_buf[2] << 8) | lun_buf[3]) & 0x3FFF; | |
925 | } | |
926 | ||
683bd967 AH |
927 | static void |
928 | vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
057cbf49 | 929 | { |
1a1ff825 | 930 | struct vhost_scsi_tpg **vs_tpg, *tpg; |
057cbf49 | 931 | struct virtio_scsi_cmd_req v_req; |
95e7c434 | 932 | struct virtio_scsi_cmd_req_pi v_req_pi; |
09d75832 | 933 | struct vhost_scsi_ctx vc; |
1a1ff825 | 934 | struct vhost_scsi_cmd *cmd; |
09d75832 | 935 | struct iov_iter in_iter, prot_iter, data_iter; |
95e7c434 | 936 | u64 tag; |
09b13fa8 | 937 | u32 exp_data_len, data_direction; |
c1ea02f1 | 938 | int ret, prot_bytes, c = 0; |
95e7c434 | 939 | u16 lun; |
09d75832 | 940 | u8 task_attr; |
09b13fa8 | 941 | bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI); |
09d75832 | 942 | void *cdb; |
057cbf49 | 943 | |
e7802212 | 944 | mutex_lock(&vq->mutex); |
4f7f46d3 AH |
945 | /* |
946 | * We can handle the vq only after the endpoint is setup by calling the | |
947 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
4f7f46d3 | 948 | */ |
247643f8 | 949 | vs_tpg = vhost_vq_get_backend(vq); |
4f7f46d3 | 950 | if (!vs_tpg) |
e7802212 | 951 | goto out; |
057cbf49 | 952 | |
09d75832 BM |
953 | memset(&vc, 0, sizeof(vc)); |
954 | vc.rsp_size = sizeof(struct virtio_scsi_cmd_resp); | |
955 | ||
057cbf49 NB |
956 | vhost_disable_notify(&vs->dev, vq); |
957 | ||
c1ea02f1 | 958 | do { |
09d75832 BM |
959 | ret = vhost_scsi_get_desc(vs, vq, &vc); |
960 | if (ret) | |
961 | goto err; | |
962 | ||
09b13fa8 NB |
963 | /* |
964 | * Setup pointers and values based upon different virtio-scsi | |
965 | * request header if T10_PI is enabled in KVM guest. | |
966 | */ | |
967 | if (t10_pi) { | |
09d75832 BM |
968 | vc.req = &v_req_pi; |
969 | vc.req_size = sizeof(v_req_pi); | |
970 | vc.lunp = &v_req_pi.lun[0]; | |
971 | vc.target = &v_req_pi.lun[1]; | |
95e7c434 | 972 | } else { |
09d75832 BM |
973 | vc.req = &v_req; |
974 | vc.req_size = sizeof(v_req); | |
975 | vc.lunp = &v_req.lun[0]; | |
976 | vc.target = &v_req.lun[1]; | |
95e7c434 NB |
977 | } |
978 | ||
09b13fa8 | 979 | /* |
09d75832 BM |
980 | * Validate the size of request and response buffers. |
981 | * Check for a sane response buffer so we can report | |
982 | * early errors back to the guest. | |
09b13fa8 | 983 | */ |
09d75832 BM |
984 | ret = vhost_scsi_chk_size(vq, &vc); |
985 | if (ret) | |
986 | goto err; | |
057cbf49 | 987 | |
09d75832 BM |
988 | ret = vhost_scsi_get_req(vq, &vc, &tpg); |
989 | if (ret) | |
990 | goto err; | |
991 | ||
992 | ret = -EIO; /* bad target on any error from here on */ | |
7fe412d0 | 993 | |
95e7c434 | 994 | /* |
09b13fa8 NB |
995 | * Determine data_direction by calculating the total outgoing |
996 | * iovec sizes + incoming iovec sizes vs. virtio-scsi request + | |
997 | * response headers respectively. | |
95e7c434 | 998 | * |
09b13fa8 NB |
999 | * For DMA_TO_DEVICE this is out_iter, which is already pointing |
1000 | * to the right place. | |
1001 | * | |
1002 | * For DMA_FROM_DEVICE, the iovec will be just past the end | |
1003 | * of the virtio-scsi response header in either the same | |
1004 | * or immediately following iovec. | |
95e7c434 | 1005 | * |
09b13fa8 NB |
1006 | * Any associated T10_PI bytes for the outgoing / incoming |
1007 | * payloads are included in calculation of exp_data_len here. | |
95e7c434 | 1008 | */ |
09b13fa8 NB |
1009 | prot_bytes = 0; |
1010 | ||
09d75832 | 1011 | if (vc.out_size > vc.req_size) { |
09b13fa8 | 1012 | data_direction = DMA_TO_DEVICE; |
09d75832 BM |
1013 | exp_data_len = vc.out_size - vc.req_size; |
1014 | data_iter = vc.out_iter; | |
1015 | } else if (vc.in_size > vc.rsp_size) { | |
09b13fa8 | 1016 | data_direction = DMA_FROM_DEVICE; |
09d75832 | 1017 | exp_data_len = vc.in_size - vc.rsp_size; |
09b13fa8 | 1018 | |
09d75832 BM |
1019 | iov_iter_init(&in_iter, READ, &vq->iov[vc.out], vc.in, |
1020 | vc.rsp_size + exp_data_len); | |
1021 | iov_iter_advance(&in_iter, vc.rsp_size); | |
09b13fa8 NB |
1022 | data_iter = in_iter; |
1023 | } else { | |
1024 | data_direction = DMA_NONE; | |
1025 | exp_data_len = 0; | |
1026 | } | |
1027 | /* | |
1028 | * If T10_PI header + payload is present, setup prot_iter values | |
1029 | * and recalculate data_iter for vhost_scsi_mapal() mapping to | |
1030 | * host scatterlists via get_user_pages_fast(). | |
95e7c434 | 1031 | */ |
09b13fa8 | 1032 | if (t10_pi) { |
95e7c434 NB |
1033 | if (v_req_pi.pi_bytesout) { |
1034 | if (data_direction != DMA_TO_DEVICE) { | |
09b13fa8 NB |
1035 | vq_err(vq, "Received non zero pi_bytesout," |
1036 | " but wrong data_direction\n"); | |
09d75832 | 1037 | goto err; |
95e7c434 | 1038 | } |
e72fd72e | 1039 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout); |
95e7c434 NB |
1040 | } else if (v_req_pi.pi_bytesin) { |
1041 | if (data_direction != DMA_FROM_DEVICE) { | |
09b13fa8 NB |
1042 | vq_err(vq, "Received non zero pi_bytesin," |
1043 | " but wrong data_direction\n"); | |
09d75832 | 1044 | goto err; |
95e7c434 | 1045 | } |
e72fd72e | 1046 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin); |
95e7c434 | 1047 | } |
09b13fa8 | 1048 | /* |
4542d623 GE |
1049 | * Set prot_iter to data_iter and truncate it to |
1050 | * prot_bytes, and advance data_iter past any | |
09b13fa8 NB |
1051 | * preceeding prot_bytes that may be present. |
1052 | * | |
1053 | * Also fix up the exp_data_len to reflect only the | |
1054 | * actual data payload length. | |
1055 | */ | |
95e7c434 | 1056 | if (prot_bytes) { |
09b13fa8 NB |
1057 | exp_data_len -= prot_bytes; |
1058 | prot_iter = data_iter; | |
4542d623 | 1059 | iov_iter_truncate(&prot_iter, prot_bytes); |
09b13fa8 | 1060 | iov_iter_advance(&data_iter, prot_bytes); |
95e7c434 | 1061 | } |
e72fd72e | 1062 | tag = vhost64_to_cpu(vq, v_req_pi.tag); |
95e7c434 NB |
1063 | task_attr = v_req_pi.task_attr; |
1064 | cdb = &v_req_pi.cdb[0]; | |
18f1becb | 1065 | lun = vhost_buf_to_lun(v_req_pi.lun); |
95e7c434 | 1066 | } else { |
e72fd72e | 1067 | tag = vhost64_to_cpu(vq, v_req.tag); |
95e7c434 NB |
1068 | task_attr = v_req.task_attr; |
1069 | cdb = &v_req.cdb[0]; | |
18f1becb | 1070 | lun = vhost_buf_to_lun(v_req.lun); |
95e7c434 | 1071 | } |
95e7c434 | 1072 | /* |
09b13fa8 NB |
1073 | * Check that the received CDB size does not exceeded our |
1074 | * hardcoded max for vhost-scsi, then get a pre-allocated | |
1075 | * cmd descriptor for the new virtio-scsi tag. | |
95e7c434 NB |
1076 | * |
1077 | * TODO what if cdb was too small for varlen cdb header? | |
1078 | */ | |
1a1ff825 | 1079 | if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) { |
95e7c434 NB |
1080 | vq_err(vq, "Received SCSI CDB with command_size: %d that" |
1081 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
1a1ff825 | 1082 | scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE); |
09d75832 | 1083 | goto err; |
95e7c434 | 1084 | } |
25b98b64 | 1085 | cmd = vhost_scsi_get_cmd(vq, tpg, cdb, tag, lun, task_attr, |
9f977ef7 NB |
1086 | exp_data_len + prot_bytes, |
1087 | data_direction); | |
3c63f66a | 1088 | if (IS_ERR(cmd)) { |
25b98b64 | 1089 | vq_err(vq, "vhost_scsi_get_cmd failed %ld\n", |
09b13fa8 | 1090 | PTR_ERR(cmd)); |
09d75832 | 1091 | goto err; |
057cbf49 | 1092 | } |
3c63f66a AH |
1093 | cmd->tvc_vhost = vs; |
1094 | cmd->tvc_vq = vq; | |
09d75832 BM |
1095 | cmd->tvc_resp_iov = vq->iov[vc.out]; |
1096 | cmd->tvc_in_iovs = vc.in; | |
057cbf49 | 1097 | |
057cbf49 | 1098 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", |
09b13fa8 NB |
1099 | cmd->tvc_cdb[0], cmd->tvc_lun); |
1100 | pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:" | |
1101 | " %d\n", cmd, exp_data_len, prot_bytes, data_direction); | |
057cbf49 NB |
1102 | |
1103 | if (data_direction != DMA_NONE) { | |
09d75832 BM |
1104 | if (unlikely(vhost_scsi_mapal(cmd, prot_bytes, |
1105 | &prot_iter, exp_data_len, | |
1106 | &data_iter))) { | |
057cbf49 | 1107 | vq_err(vq, "Failed to map iov to sgl\n"); |
47a3565e | 1108 | vhost_scsi_release_cmd_res(&cmd->tvc_se_cmd); |
09d75832 | 1109 | goto err; |
057cbf49 NB |
1110 | } |
1111 | } | |
057cbf49 NB |
1112 | /* |
1113 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
1114 | * complete the virtio-scsi request in TCM callback context via | |
09b13fa8 | 1115 | * vhost_scsi_queue_data_in() and vhost_scsi_queue_status() |
057cbf49 | 1116 | */ |
09d75832 | 1117 | cmd->tvc_vq_desc = vc.head; |
6ec29cb8 | 1118 | vhost_scsi_target_queue_cmd(cmd); |
09d75832 BM |
1119 | ret = 0; |
1120 | err: | |
1121 | /* | |
1122 | * ENXIO: No more requests, or read error, wait for next kick | |
1123 | * EINVAL: Invalid response buffer, drop the request | |
1124 | * EIO: Respond with bad target | |
1125 | * EAGAIN: Pending request | |
1126 | */ | |
1127 | if (ret == -ENXIO) | |
1128 | break; | |
1129 | else if (ret == -EIO) | |
1130 | vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out); | |
c1ea02f1 | 1131 | } while (likely(!vhost_exceeds_weight(vq, ++c, 0))); |
e7802212 | 1132 | out: |
7ea206cf | 1133 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
1134 | } |
1135 | ||
0d02dbd6 | 1136 | static void |
efd838fe MC |
1137 | vhost_scsi_send_tmf_resp(struct vhost_scsi *vs, struct vhost_virtqueue *vq, |
1138 | int in_iovs, int vq_desc, struct iovec *resp_iov, | |
1139 | int tmf_resp_code) | |
0d02dbd6 | 1140 | { |
0d02dbd6 | 1141 | struct virtio_scsi_ctrl_tmf_resp rsp; |
8e5dadfe | 1142 | struct iov_iter iov_iter; |
0d02dbd6 BM |
1143 | int ret; |
1144 | ||
1145 | pr_debug("%s\n", __func__); | |
1146 | memset(&rsp, 0, sizeof(rsp)); | |
efd838fe | 1147 | rsp.response = tmf_resp_code; |
8e5dadfe | 1148 | |
efd838fe | 1149 | iov_iter_init(&iov_iter, READ, resp_iov, in_iovs, sizeof(rsp)); |
8e5dadfe BM |
1150 | |
1151 | ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter); | |
1152 | if (likely(ret == sizeof(rsp))) | |
efd838fe | 1153 | vhost_add_used_and_signal(&vs->dev, vq, vq_desc, 0); |
0d02dbd6 BM |
1154 | else |
1155 | pr_err("Faulted on virtio_scsi_ctrl_tmf_resp\n"); | |
1156 | } | |
1157 | ||
efd838fe MC |
1158 | static void vhost_scsi_tmf_resp_work(struct vhost_work *work) |
1159 | { | |
1160 | struct vhost_scsi_tmf *tmf = container_of(work, struct vhost_scsi_tmf, | |
1161 | vwork); | |
1162 | int resp_code; | |
1163 | ||
b4fffc17 | 1164 | if (tmf->scsi_resp == TMR_FUNCTION_COMPLETE) |
efd838fe MC |
1165 | resp_code = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; |
1166 | else | |
1167 | resp_code = VIRTIO_SCSI_S_FUNCTION_REJECTED; | |
1168 | ||
1169 | vhost_scsi_send_tmf_resp(tmf->vhost, &tmf->svq->vq, tmf->in_iovs, | |
1170 | tmf->vq_desc, &tmf->resp_iov, resp_code); | |
1171 | vhost_scsi_release_tmf_res(tmf); | |
1172 | } | |
1173 | ||
1174 | static void | |
1175 | vhost_scsi_handle_tmf(struct vhost_scsi *vs, struct vhost_scsi_tpg *tpg, | |
1176 | struct vhost_virtqueue *vq, | |
1177 | struct virtio_scsi_ctrl_tmf_req *vtmf, | |
1178 | struct vhost_scsi_ctx *vc) | |
1179 | { | |
1180 | struct vhost_scsi_virtqueue *svq = container_of(vq, | |
1181 | struct vhost_scsi_virtqueue, vq); | |
1182 | struct vhost_scsi_tmf *tmf; | |
1183 | ||
1184 | if (vhost32_to_cpu(vq, vtmf->subtype) != | |
1185 | VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET) | |
1186 | goto send_reject; | |
1187 | ||
1188 | if (!tpg->tpg_nexus || !tpg->tpg_nexus->tvn_se_sess) { | |
1189 | pr_err("Unable to locate active struct vhost_scsi_nexus for LUN RESET.\n"); | |
1190 | goto send_reject; | |
1191 | } | |
1192 | ||
1193 | mutex_lock(&tpg->tv_tpg_mutex); | |
1194 | if (list_empty(&tpg->tmf_queue)) { | |
1195 | pr_err("Missing reserve TMF. Could not handle LUN RESET.\n"); | |
1196 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1197 | goto send_reject; | |
1198 | } | |
1199 | ||
1200 | tmf = list_first_entry(&tpg->tmf_queue, struct vhost_scsi_tmf, | |
1201 | queue_entry); | |
1202 | list_del_init(&tmf->queue_entry); | |
1203 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1204 | ||
1205 | tmf->tpg = tpg; | |
1206 | tmf->vhost = vs; | |
1207 | tmf->svq = svq; | |
1208 | tmf->resp_iov = vq->iov[vc->out]; | |
1209 | tmf->vq_desc = vc->head; | |
1210 | tmf->in_iovs = vc->in; | |
1211 | tmf->inflight = vhost_scsi_get_inflight(vq); | |
1212 | ||
1213 | if (target_submit_tmr(&tmf->se_cmd, tpg->tpg_nexus->tvn_se_sess, NULL, | |
1214 | vhost_buf_to_lun(vtmf->lun), NULL, | |
1215 | TMR_LUN_RESET, GFP_KERNEL, 0, | |
1216 | TARGET_SCF_ACK_KREF) < 0) { | |
1217 | vhost_scsi_release_tmf_res(tmf); | |
1218 | goto send_reject; | |
1219 | } | |
1220 | ||
1221 | return; | |
1222 | ||
1223 | send_reject: | |
1224 | vhost_scsi_send_tmf_resp(vs, vq, vc->in, vc->head, &vq->iov[vc->out], | |
1225 | VIRTIO_SCSI_S_FUNCTION_REJECTED); | |
1226 | } | |
1227 | ||
0d02dbd6 BM |
1228 | static void |
1229 | vhost_scsi_send_an_resp(struct vhost_scsi *vs, | |
3f8ca2e1 BM |
1230 | struct vhost_virtqueue *vq, |
1231 | struct vhost_scsi_ctx *vc) | |
0d02dbd6 | 1232 | { |
0d02dbd6 | 1233 | struct virtio_scsi_ctrl_an_resp rsp; |
8e5dadfe | 1234 | struct iov_iter iov_iter; |
0d02dbd6 BM |
1235 | int ret; |
1236 | ||
1237 | pr_debug("%s\n", __func__); | |
1238 | memset(&rsp, 0, sizeof(rsp)); /* event_actual = 0 */ | |
1239 | rsp.response = VIRTIO_SCSI_S_OK; | |
8e5dadfe BM |
1240 | |
1241 | iov_iter_init(&iov_iter, READ, &vq->iov[vc->out], vc->in, sizeof(rsp)); | |
1242 | ||
1243 | ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter); | |
1244 | if (likely(ret == sizeof(rsp))) | |
3f8ca2e1 | 1245 | vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0); |
0d02dbd6 BM |
1246 | else |
1247 | pr_err("Faulted on virtio_scsi_ctrl_an_resp\n"); | |
1248 | } | |
1249 | ||
1250 | static void | |
1251 | vhost_scsi_ctl_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
1252 | { | |
efd838fe | 1253 | struct vhost_scsi_tpg *tpg; |
0d02dbd6 BM |
1254 | union { |
1255 | __virtio32 type; | |
1256 | struct virtio_scsi_ctrl_an_req an; | |
1257 | struct virtio_scsi_ctrl_tmf_req tmf; | |
1258 | } v_req; | |
3f8ca2e1 BM |
1259 | struct vhost_scsi_ctx vc; |
1260 | size_t typ_size; | |
c1ea02f1 | 1261 | int ret, c = 0; |
0d02dbd6 BM |
1262 | |
1263 | mutex_lock(&vq->mutex); | |
1264 | /* | |
1265 | * We can handle the vq only after the endpoint is setup by calling the | |
1266 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
1267 | */ | |
247643f8 | 1268 | if (!vhost_vq_get_backend(vq)) |
0d02dbd6 BM |
1269 | goto out; |
1270 | ||
3f8ca2e1 BM |
1271 | memset(&vc, 0, sizeof(vc)); |
1272 | ||
0d02dbd6 BM |
1273 | vhost_disable_notify(&vs->dev, vq); |
1274 | ||
c1ea02f1 | 1275 | do { |
3f8ca2e1 BM |
1276 | ret = vhost_scsi_get_desc(vs, vq, &vc); |
1277 | if (ret) | |
1278 | goto err; | |
0d02dbd6 BM |
1279 | |
1280 | /* | |
3f8ca2e1 BM |
1281 | * Get the request type first in order to setup |
1282 | * other parameters dependent on the type. | |
0d02dbd6 | 1283 | */ |
3f8ca2e1 | 1284 | vc.req = &v_req.type; |
0d02dbd6 BM |
1285 | typ_size = sizeof(v_req.type); |
1286 | ||
3f8ca2e1 BM |
1287 | if (unlikely(!copy_from_iter_full(vc.req, typ_size, |
1288 | &vc.out_iter))) { | |
0d02dbd6 BM |
1289 | vq_err(vq, "Faulted on copy_from_iter tmf type\n"); |
1290 | /* | |
3f8ca2e1 BM |
1291 | * The size of the response buffer depends on the |
1292 | * request type and must be validated against it. | |
0d02dbd6 BM |
1293 | * Since the request type is not known, don't send |
1294 | * a response. | |
1295 | */ | |
1296 | continue; | |
1297 | } | |
1298 | ||
295c1b98 | 1299 | switch (vhost32_to_cpu(vq, v_req.type)) { |
0d02dbd6 | 1300 | case VIRTIO_SCSI_T_TMF: |
3f8ca2e1 BM |
1301 | vc.req = &v_req.tmf; |
1302 | vc.req_size = sizeof(struct virtio_scsi_ctrl_tmf_req); | |
1303 | vc.rsp_size = sizeof(struct virtio_scsi_ctrl_tmf_resp); | |
1304 | vc.lunp = &v_req.tmf.lun[0]; | |
1305 | vc.target = &v_req.tmf.lun[1]; | |
0d02dbd6 BM |
1306 | break; |
1307 | case VIRTIO_SCSI_T_AN_QUERY: | |
1308 | case VIRTIO_SCSI_T_AN_SUBSCRIBE: | |
3f8ca2e1 BM |
1309 | vc.req = &v_req.an; |
1310 | vc.req_size = sizeof(struct virtio_scsi_ctrl_an_req); | |
1311 | vc.rsp_size = sizeof(struct virtio_scsi_ctrl_an_resp); | |
1312 | vc.lunp = &v_req.an.lun[0]; | |
1313 | vc.target = NULL; | |
0d02dbd6 BM |
1314 | break; |
1315 | default: | |
1316 | vq_err(vq, "Unknown control request %d", v_req.type); | |
1317 | continue; | |
1318 | } | |
1319 | ||
1320 | /* | |
3f8ca2e1 BM |
1321 | * Validate the size of request and response buffers. |
1322 | * Check for a sane response buffer so we can report | |
1323 | * early errors back to the guest. | |
0d02dbd6 | 1324 | */ |
3f8ca2e1 BM |
1325 | ret = vhost_scsi_chk_size(vq, &vc); |
1326 | if (ret) | |
1327 | goto err; | |
0d02dbd6 | 1328 | |
3f8ca2e1 BM |
1329 | /* |
1330 | * Get the rest of the request now that its size is known. | |
1331 | */ | |
1332 | vc.req += typ_size; | |
1333 | vc.req_size -= typ_size; | |
0d02dbd6 | 1334 | |
efd838fe | 1335 | ret = vhost_scsi_get_req(vq, &vc, &tpg); |
3f8ca2e1 BM |
1336 | if (ret) |
1337 | goto err; | |
0d02dbd6 | 1338 | |
3f8ca2e1 | 1339 | if (v_req.type == VIRTIO_SCSI_T_TMF) |
efd838fe | 1340 | vhost_scsi_handle_tmf(vs, tpg, vq, &v_req.tmf, &vc); |
3f8ca2e1 BM |
1341 | else |
1342 | vhost_scsi_send_an_resp(vs, vq, &vc); | |
1343 | err: | |
1344 | /* | |
1345 | * ENXIO: No more requests, or read error, wait for next kick | |
1346 | * EINVAL: Invalid response buffer, drop the request | |
1347 | * EIO: Respond with bad target | |
1348 | * EAGAIN: Pending request | |
1349 | */ | |
1350 | if (ret == -ENXIO) | |
1351 | break; | |
1352 | else if (ret == -EIO) | |
1353 | vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out); | |
c1ea02f1 | 1354 | } while (likely(!vhost_exceeds_weight(vq, ++c, 0))); |
0d02dbd6 BM |
1355 | out: |
1356 | mutex_unlock(&vq->mutex); | |
1357 | } | |
1358 | ||
057cbf49 NB |
1359 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) |
1360 | { | |
0d02dbd6 BM |
1361 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1362 | poll.work); | |
1363 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1364 | ||
101998f6 | 1365 | pr_debug("%s: The handling func for control queue.\n", __func__); |
0d02dbd6 | 1366 | vhost_scsi_ctl_handle_vq(vs, vq); |
057cbf49 NB |
1367 | } |
1368 | ||
683bd967 | 1369 | static void |
1a1ff825 NB |
1370 | vhost_scsi_send_evt(struct vhost_scsi *vs, |
1371 | struct vhost_scsi_tpg *tpg, | |
683bd967 AH |
1372 | struct se_lun *lun, |
1373 | u32 event, | |
1374 | u32 reason) | |
a6c9af87 | 1375 | { |
1a1ff825 | 1376 | struct vhost_scsi_evt *evt; |
a6c9af87 | 1377 | |
1a1ff825 | 1378 | evt = vhost_scsi_allocate_evt(vs, event, reason); |
a6c9af87 AH |
1379 | if (!evt) |
1380 | return; | |
1381 | ||
1382 | if (tpg && lun) { | |
1383 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
1384 | /* | |
1385 | * Note: evt->event is zeroed when we allocate it and | |
1386 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
1387 | */ | |
1388 | evt->event.lun[0] = 0x01; | |
59c816c1 | 1389 | evt->event.lun[1] = tpg->tport_tpgt; |
a6c9af87 AH |
1390 | if (lun->unpacked_lun >= 256) |
1391 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
1392 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
1393 | } | |
1394 | ||
1395 | llist_add(&evt->list, &vs->vs_event_list); | |
1396 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
1397 | } | |
1398 | ||
057cbf49 NB |
1399 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
1400 | { | |
a6c9af87 AH |
1401 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1402 | poll.work); | |
1403 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1404 | ||
1405 | mutex_lock(&vq->mutex); | |
247643f8 | 1406 | if (!vhost_vq_get_backend(vq)) |
a6c9af87 AH |
1407 | goto out; |
1408 | ||
1409 | if (vs->vs_events_missed) | |
1a1ff825 | 1410 | vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); |
a6c9af87 AH |
1411 | out: |
1412 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
1413 | } |
1414 | ||
1415 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
1416 | { | |
1417 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
1418 | poll.work); | |
1419 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1420 | ||
1b7f390e | 1421 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
1422 | } |
1423 | ||
3dfbff32 | 1424 | /* Callers must hold dev mutex */ |
4f7f46d3 AH |
1425 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
1426 | { | |
1427 | int i; | |
1428 | ||
f2f0173d | 1429 | /* Init new inflight and remember the old inflight */ |
f49c2226 | 1430 | vhost_scsi_init_inflight(vs, vs->old_inflight); |
f2f0173d AH |
1431 | |
1432 | /* | |
1433 | * The inflight->kref was initialized to 1. We decrement it here to | |
1434 | * indicate the start of the flush operation so that it will reach 0 | |
1435 | * when all the reqs are finished. | |
1436 | */ | |
f49c2226 MC |
1437 | for (i = 0; i < vs->dev.nvqs; i++) |
1438 | kref_put(&vs->old_inflight[i]->kref, vhost_scsi_done_inflight); | |
f2f0173d AH |
1439 | |
1440 | /* Flush both the vhost poll and vhost work */ | |
b2ffa407 | 1441 | vhost_dev_flush(&vs->dev); |
f2f0173d AH |
1442 | |
1443 | /* Wait for all reqs issued before the flush to be finished */ | |
f49c2226 MC |
1444 | for (i = 0; i < vs->dev.nvqs; i++) |
1445 | wait_for_completion(&vs->old_inflight[i]->comp); | |
4f7f46d3 AH |
1446 | } |
1447 | ||
25b98b64 MC |
1448 | static void vhost_scsi_destroy_vq_cmds(struct vhost_virtqueue *vq) |
1449 | { | |
1450 | struct vhost_scsi_virtqueue *svq = container_of(vq, | |
1451 | struct vhost_scsi_virtqueue, vq); | |
1452 | struct vhost_scsi_cmd *tv_cmd; | |
1453 | unsigned int i; | |
1454 | ||
1455 | if (!svq->scsi_cmds) | |
1456 | return; | |
1457 | ||
1458 | for (i = 0; i < svq->max_cmds; i++) { | |
1459 | tv_cmd = &svq->scsi_cmds[i]; | |
1460 | ||
1461 | kfree(tv_cmd->tvc_sgl); | |
1462 | kfree(tv_cmd->tvc_prot_sgl); | |
1463 | kfree(tv_cmd->tvc_upages); | |
1464 | } | |
1465 | ||
1466 | sbitmap_free(&svq->scsi_tags); | |
1467 | kfree(svq->scsi_cmds); | |
1468 | svq->scsi_cmds = NULL; | |
1469 | } | |
1470 | ||
1471 | static int vhost_scsi_setup_vq_cmds(struct vhost_virtqueue *vq, int max_cmds) | |
1472 | { | |
1473 | struct vhost_scsi_virtqueue *svq = container_of(vq, | |
1474 | struct vhost_scsi_virtqueue, vq); | |
1475 | struct vhost_scsi_cmd *tv_cmd; | |
1476 | unsigned int i; | |
1477 | ||
1478 | if (svq->scsi_cmds) | |
1479 | return 0; | |
1480 | ||
1481 | if (sbitmap_init_node(&svq->scsi_tags, max_cmds, -1, GFP_KERNEL, | |
c548e62b | 1482 | NUMA_NO_NODE, false, true)) |
25b98b64 MC |
1483 | return -ENOMEM; |
1484 | svq->max_cmds = max_cmds; | |
1485 | ||
1486 | svq->scsi_cmds = kcalloc(max_cmds, sizeof(*tv_cmd), GFP_KERNEL); | |
1487 | if (!svq->scsi_cmds) { | |
1488 | sbitmap_free(&svq->scsi_tags); | |
1489 | return -ENOMEM; | |
1490 | } | |
1491 | ||
1492 | for (i = 0; i < max_cmds; i++) { | |
1493 | tv_cmd = &svq->scsi_cmds[i]; | |
1494 | ||
1495 | tv_cmd->tvc_sgl = kcalloc(VHOST_SCSI_PREALLOC_SGLS, | |
1496 | sizeof(struct scatterlist), | |
1497 | GFP_KERNEL); | |
1498 | if (!tv_cmd->tvc_sgl) { | |
1499 | pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); | |
1500 | goto out; | |
1501 | } | |
1502 | ||
1503 | tv_cmd->tvc_upages = kcalloc(VHOST_SCSI_PREALLOC_UPAGES, | |
1504 | sizeof(struct page *), | |
1505 | GFP_KERNEL); | |
1506 | if (!tv_cmd->tvc_upages) { | |
1507 | pr_err("Unable to allocate tv_cmd->tvc_upages\n"); | |
1508 | goto out; | |
1509 | } | |
1510 | ||
1511 | tv_cmd->tvc_prot_sgl = kcalloc(VHOST_SCSI_PREALLOC_PROT_SGLS, | |
1512 | sizeof(struct scatterlist), | |
1513 | GFP_KERNEL); | |
1514 | if (!tv_cmd->tvc_prot_sgl) { | |
1515 | pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); | |
1516 | goto out; | |
1517 | } | |
1518 | } | |
1519 | return 0; | |
1520 | out: | |
1521 | vhost_scsi_destroy_vq_cmds(vq); | |
1522 | return -ENOMEM; | |
1523 | } | |
1524 | ||
057cbf49 NB |
1525 | /* |
1526 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
1a1ff825 | 1527 | * vhost_scsi_tpg with an active struct vhost_scsi_nexus |
f2b7daf5 AH |
1528 | * |
1529 | * The lock nesting rule is: | |
1a1ff825 | 1530 | * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex |
057cbf49 | 1531 | */ |
683bd967 AH |
1532 | static int |
1533 | vhost_scsi_set_endpoint(struct vhost_scsi *vs, | |
1534 | struct vhost_scsi_target *t) | |
057cbf49 | 1535 | { |
ab8edab1 | 1536 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1537 | struct vhost_scsi_tport *tv_tport; |
1538 | struct vhost_scsi_tpg *tpg; | |
1539 | struct vhost_scsi_tpg **vs_tpg; | |
4f7f46d3 AH |
1540 | struct vhost_virtqueue *vq; |
1541 | int index, ret, i, len; | |
67e18cf9 | 1542 | bool match = false; |
057cbf49 | 1543 | |
1a1ff825 | 1544 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 1545 | mutex_lock(&vs->dev.mutex); |
f2b7daf5 | 1546 | |
057cbf49 NB |
1547 | /* Verify that ring has been setup correctly. */ |
1548 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
1549 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 1550 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
1551 | ret = -EFAULT; |
1552 | goto out; | |
057cbf49 NB |
1553 | } |
1554 | } | |
057cbf49 | 1555 | |
4f7f46d3 AH |
1556 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
1557 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
1558 | if (!vs_tpg) { | |
f2b7daf5 AH |
1559 | ret = -ENOMEM; |
1560 | goto out; | |
4f7f46d3 AH |
1561 | } |
1562 | if (vs->vs_tpg) | |
1563 | memcpy(vs_tpg, vs->vs_tpg, len); | |
1564 | ||
1a1ff825 | 1565 | list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) { |
98718312 AH |
1566 | mutex_lock(&tpg->tv_tpg_mutex); |
1567 | if (!tpg->tpg_nexus) { | |
1568 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1569 | continue; |
1570 | } | |
98718312 AH |
1571 | if (tpg->tv_tpg_vhost_count != 0) { |
1572 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1573 | continue; |
1574 | } | |
98718312 | 1575 | tv_tport = tpg->tport; |
057cbf49 | 1576 | |
67e18cf9 | 1577 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
98718312 | 1578 | if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
98718312 | 1579 | mutex_unlock(&tpg->tv_tpg_mutex); |
f2b7daf5 | 1580 | ret = -EEXIST; |
25b98b64 | 1581 | goto undepend; |
101998f6 | 1582 | } |
ab8edab1 NB |
1583 | /* |
1584 | * In order to ensure individual vhost-scsi configfs | |
1585 | * groups cannot be removed while in use by vhost ioctl, | |
1586 | * go ahead and take an explicit se_tpg->tpg_group.cg_item | |
1587 | * dependency now. | |
1588 | */ | |
1589 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1590 | ret = target_depend_item(&se_tpg->tpg_group.cg_item); |
ab8edab1 | 1591 | if (ret) { |
a691ffb4 | 1592 | pr_warn("target_depend_item() failed: %d\n", ret); |
ab8edab1 | 1593 | mutex_unlock(&tpg->tv_tpg_mutex); |
25b98b64 | 1594 | goto undepend; |
ab8edab1 | 1595 | } |
98718312 AH |
1596 | tpg->tv_tpg_vhost_count++; |
1597 | tpg->vhost_scsi = vs; | |
1598 | vs_tpg[tpg->tport_tpgt] = tpg; | |
67e18cf9 | 1599 | match = true; |
057cbf49 | 1600 | } |
98718312 | 1601 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1602 | } |
67e18cf9 AH |
1603 | |
1604 | if (match) { | |
1605 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1606 | sizeof(vs->vs_vhost_wwpn)); | |
25b98b64 | 1607 | |
f49c2226 | 1608 | for (i = VHOST_SCSI_VQ_IO; i < vs->dev.nvqs; i++) { |
25b98b64 MC |
1609 | vq = &vs->vqs[i].vq; |
1610 | if (!vhost_vq_is_setup(vq)) | |
1611 | continue; | |
1612 | ||
2e1139d6 ZC |
1613 | ret = vhost_scsi_setup_vq_cmds(vq, vq->num); |
1614 | if (ret) | |
25b98b64 MC |
1615 | goto destroy_vq_cmds; |
1616 | } | |
1617 | ||
f49c2226 | 1618 | for (i = 0; i < vs->dev.nvqs; i++) { |
3ab2e420 | 1619 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1620 | mutex_lock(&vq->mutex); |
247643f8 | 1621 | vhost_vq_set_backend(vq, vs_tpg); |
80f7d030 | 1622 | vhost_vq_init_access(vq); |
4f7f46d3 AH |
1623 | mutex_unlock(&vq->mutex); |
1624 | } | |
67e18cf9 AH |
1625 | ret = 0; |
1626 | } else { | |
1627 | ret = -EEXIST; | |
1628 | } | |
1629 | ||
4f7f46d3 AH |
1630 | /* |
1631 | * Act as synchronize_rcu to make sure access to | |
1632 | * old vs->vs_tpg is finished. | |
1633 | */ | |
1634 | vhost_scsi_flush(vs); | |
1635 | kfree(vs->vs_tpg); | |
1636 | vs->vs_tpg = vs_tpg; | |
25b98b64 | 1637 | goto out; |
4f7f46d3 | 1638 | |
25b98b64 MC |
1639 | destroy_vq_cmds: |
1640 | for (i--; i >= VHOST_SCSI_VQ_IO; i--) { | |
1641 | if (!vhost_vq_get_backend(&vs->vqs[i].vq)) | |
1642 | vhost_scsi_destroy_vq_cmds(&vs->vqs[i].vq); | |
1643 | } | |
1644 | undepend: | |
1645 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { | |
1646 | tpg = vs_tpg[i]; | |
1647 | if (tpg) { | |
1648 | tpg->tv_tpg_vhost_count--; | |
1649 | target_undepend_item(&tpg->se_tpg.tpg_group.cg_item); | |
1650 | } | |
1651 | } | |
1652 | kfree(vs_tpg); | |
f2b7daf5 | 1653 | out: |
67e18cf9 | 1654 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1655 | mutex_unlock(&vhost_scsi_mutex); |
67e18cf9 | 1656 | return ret; |
057cbf49 NB |
1657 | } |
1658 | ||
683bd967 AH |
1659 | static int |
1660 | vhost_scsi_clear_endpoint(struct vhost_scsi *vs, | |
1661 | struct vhost_scsi_target *t) | |
057cbf49 | 1662 | { |
ab8edab1 | 1663 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1664 | struct vhost_scsi_tport *tv_tport; |
1665 | struct vhost_scsi_tpg *tpg; | |
4f7f46d3 AH |
1666 | struct vhost_virtqueue *vq; |
1667 | bool match = false; | |
67e18cf9 AH |
1668 | int index, ret, i; |
1669 | u8 target; | |
057cbf49 | 1670 | |
1a1ff825 | 1671 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 NB |
1672 | mutex_lock(&vs->dev.mutex); |
1673 | /* Verify that ring has been setup correctly. */ | |
1674 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1675 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1676 | ret = -EFAULT; |
038e0af4 | 1677 | goto err_dev; |
057cbf49 NB |
1678 | } |
1679 | } | |
4f7f46d3 AH |
1680 | |
1681 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1682 | ret = 0; |
1683 | goto err_dev; | |
4f7f46d3 AH |
1684 | } |
1685 | ||
67e18cf9 AH |
1686 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1687 | target = i; | |
98718312 AH |
1688 | tpg = vs->vs_tpg[target]; |
1689 | if (!tpg) | |
67e18cf9 AH |
1690 | continue; |
1691 | ||
98718312 AH |
1692 | mutex_lock(&tpg->tv_tpg_mutex); |
1693 | tv_tport = tpg->tport; | |
67e18cf9 AH |
1694 | if (!tv_tport) { |
1695 | ret = -ENODEV; | |
038e0af4 | 1696 | goto err_tpg; |
67e18cf9 AH |
1697 | } |
1698 | ||
1699 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
98718312 | 1700 | pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" |
67e18cf9 | 1701 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", |
98718312 | 1702 | tv_tport->tport_name, tpg->tport_tpgt, |
67e18cf9 AH |
1703 | t->vhost_wwpn, t->vhost_tpgt); |
1704 | ret = -EINVAL; | |
038e0af4 | 1705 | goto err_tpg; |
67e18cf9 | 1706 | } |
98718312 AH |
1707 | tpg->tv_tpg_vhost_count--; |
1708 | tpg->vhost_scsi = NULL; | |
67e18cf9 | 1709 | vs->vs_tpg[target] = NULL; |
4f7f46d3 | 1710 | match = true; |
98718312 | 1711 | mutex_unlock(&tpg->tv_tpg_mutex); |
ab8edab1 NB |
1712 | /* |
1713 | * Release se_tpg->tpg_group.cg_item configfs dependency now | |
1714 | * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur. | |
1715 | */ | |
1716 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1717 | target_undepend_item(&se_tpg->tpg_group.cg_item); |
057cbf49 | 1718 | } |
4f7f46d3 | 1719 | if (match) { |
f49c2226 | 1720 | for (i = 0; i < vs->dev.nvqs; i++) { |
3ab2e420 | 1721 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1722 | mutex_lock(&vq->mutex); |
247643f8 | 1723 | vhost_vq_set_backend(vq, NULL); |
4f7f46d3 | 1724 | mutex_unlock(&vq->mutex); |
d60146c1 MC |
1725 | } |
1726 | /* Make sure cmds are not running before tearing them down. */ | |
1727 | vhost_scsi_flush(vs); | |
1728 | ||
f49c2226 | 1729 | for (i = 0; i < vs->dev.nvqs; i++) { |
d60146c1 | 1730 | vq = &vs->vqs[i].vq; |
25b98b64 | 1731 | vhost_scsi_destroy_vq_cmds(vq); |
4f7f46d3 AH |
1732 | } |
1733 | } | |
1734 | /* | |
1735 | * Act as synchronize_rcu to make sure access to | |
1736 | * old vs->vs_tpg is finished. | |
1737 | */ | |
1738 | vhost_scsi_flush(vs); | |
1739 | kfree(vs->vs_tpg); | |
1740 | vs->vs_tpg = NULL; | |
a6c9af87 | 1741 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1742 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1743 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 1744 | return 0; |
101998f6 | 1745 | |
038e0af4 | 1746 | err_tpg: |
98718312 | 1747 | mutex_unlock(&tpg->tv_tpg_mutex); |
038e0af4 | 1748 | err_dev: |
101998f6 | 1749 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1750 | mutex_unlock(&vhost_scsi_mutex); |
101998f6 | 1751 | return ret; |
057cbf49 NB |
1752 | } |
1753 | ||
4f7f46d3 AH |
1754 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1755 | { | |
ea16c514 MT |
1756 | struct vhost_virtqueue *vq; |
1757 | int i; | |
1758 | ||
4f7f46d3 AH |
1759 | if (features & ~VHOST_SCSI_FEATURES) |
1760 | return -EOPNOTSUPP; | |
1761 | ||
1762 | mutex_lock(&vs->dev.mutex); | |
1763 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1764 | !vhost_log_access_ok(&vs->dev)) { | |
1765 | mutex_unlock(&vs->dev.mutex); | |
1766 | return -EFAULT; | |
1767 | } | |
ea16c514 | 1768 | |
f49c2226 | 1769 | for (i = 0; i < vs->dev.nvqs; i++) { |
ea16c514 MT |
1770 | vq = &vs->vqs[i].vq; |
1771 | mutex_lock(&vq->mutex); | |
1772 | vq->acked_features = features; | |
1773 | mutex_unlock(&vq->mutex); | |
1774 | } | |
4f7f46d3 AH |
1775 | mutex_unlock(&vs->dev.mutex); |
1776 | return 0; | |
1777 | } | |
1778 | ||
057cbf49 NB |
1779 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1780 | { | |
c7289312 | 1781 | struct vhost_scsi *vs; |
3ab2e420 | 1782 | struct vhost_virtqueue **vqs; |
f49c2226 | 1783 | int r = -ENOMEM, i, nvqs = vhost_scsi_max_io_vqs; |
057cbf49 | 1784 | |
489084dd DZ |
1785 | vs = kvzalloc(sizeof(*vs), GFP_KERNEL); |
1786 | if (!vs) | |
1787 | goto err_vs; | |
057cbf49 | 1788 | |
f49c2226 MC |
1789 | if (nvqs > VHOST_SCSI_MAX_IO_VQ) { |
1790 | pr_err("Invalid max_io_vqs of %d. Using %d.\n", nvqs, | |
1791 | VHOST_SCSI_MAX_IO_VQ); | |
1792 | nvqs = VHOST_SCSI_MAX_IO_VQ; | |
1793 | } else if (nvqs == 0) { | |
1794 | pr_err("Invalid max_io_vqs of %d. Using 1.\n", nvqs); | |
1795 | nvqs = 1; | |
1796 | } | |
1797 | nvqs += VHOST_SCSI_VQ_IO; | |
1798 | ||
1799 | vs->compl_bitmap = bitmap_alloc(nvqs, GFP_KERNEL); | |
1800 | if (!vs->compl_bitmap) | |
1801 | goto err_compl_bitmap; | |
1802 | ||
1803 | vs->old_inflight = kmalloc_array(nvqs, sizeof(*vs->old_inflight), | |
1804 | GFP_KERNEL | __GFP_ZERO); | |
1805 | if (!vs->old_inflight) | |
1806 | goto err_inflight; | |
1807 | ||
1808 | vs->vqs = kmalloc_array(nvqs, sizeof(*vs->vqs), | |
1809 | GFP_KERNEL | __GFP_ZERO); | |
1810 | if (!vs->vqs) | |
595cb754 | 1811 | goto err_vqs; |
3ab2e420 | 1812 | |
f49c2226 MC |
1813 | vqs = kmalloc_array(nvqs, sizeof(*vqs), GFP_KERNEL); |
1814 | if (!vqs) | |
1815 | goto err_local_vqs; | |
1816 | ||
c7289312 | 1817 | vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); |
1a1ff825 | 1818 | vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work); |
a6c9af87 | 1819 | |
c7289312 AH |
1820 | vs->vs_events_nr = 0; |
1821 | vs->vs_events_missed = false; | |
057cbf49 | 1822 | |
c7289312 AH |
1823 | vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; |
1824 | vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1825 | vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1826 | vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
f49c2226 | 1827 | for (i = VHOST_SCSI_VQ_IO; i < nvqs; i++) { |
c7289312 AH |
1828 | vqs[i] = &vs->vqs[i].vq; |
1829 | vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
3ab2e420 | 1830 | } |
f49c2226 | 1831 | vhost_dev_init(&vs->dev, vqs, nvqs, UIO_MAXIOV, |
01fcb1cb | 1832 | VHOST_SCSI_WEIGHT, 0, true, NULL); |
f2f0173d | 1833 | |
1a1ff825 | 1834 | vhost_scsi_init_inflight(vs, NULL); |
f2f0173d | 1835 | |
c7289312 | 1836 | f->private_data = vs; |
057cbf49 | 1837 | return 0; |
595cb754 | 1838 | |
f49c2226 MC |
1839 | err_local_vqs: |
1840 | kfree(vs->vqs); | |
595cb754 | 1841 | err_vqs: |
f49c2226 MC |
1842 | kfree(vs->old_inflight); |
1843 | err_inflight: | |
1844 | bitmap_free(vs->compl_bitmap); | |
1845 | err_compl_bitmap: | |
68404441 | 1846 | kvfree(vs); |
595cb754 MT |
1847 | err_vs: |
1848 | return r; | |
057cbf49 NB |
1849 | } |
1850 | ||
1851 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1852 | { | |
c7289312 | 1853 | struct vhost_scsi *vs = f->private_data; |
67e18cf9 | 1854 | struct vhost_scsi_target t; |
057cbf49 | 1855 | |
c7289312 AH |
1856 | mutex_lock(&vs->dev.mutex); |
1857 | memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1858 | mutex_unlock(&vs->dev.mutex); | |
1859 | vhost_scsi_clear_endpoint(vs, &t); | |
1860 | vhost_dev_stop(&vs->dev); | |
f6f93f75 | 1861 | vhost_dev_cleanup(&vs->dev); |
c7289312 | 1862 | kfree(vs->dev.vqs); |
f49c2226 MC |
1863 | kfree(vs->vqs); |
1864 | kfree(vs->old_inflight); | |
1865 | bitmap_free(vs->compl_bitmap); | |
68404441 | 1866 | kvfree(vs); |
057cbf49 NB |
1867 | return 0; |
1868 | } | |
1869 | ||
683bd967 AH |
1870 | static long |
1871 | vhost_scsi_ioctl(struct file *f, | |
1872 | unsigned int ioctl, | |
1873 | unsigned long arg) | |
057cbf49 NB |
1874 | { |
1875 | struct vhost_scsi *vs = f->private_data; | |
1876 | struct vhost_scsi_target backend; | |
1877 | void __user *argp = (void __user *)arg; | |
1878 | u64 __user *featurep = argp; | |
11c63418 AH |
1879 | u32 __user *eventsp = argp; |
1880 | u32 events_missed; | |
057cbf49 | 1881 | u64 features; |
101998f6 | 1882 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1883 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1884 | |
1885 | switch (ioctl) { | |
1886 | case VHOST_SCSI_SET_ENDPOINT: | |
1887 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1888 | return -EFAULT; | |
6de7145c MT |
1889 | if (backend.reserved != 0) |
1890 | return -EOPNOTSUPP; | |
057cbf49 NB |
1891 | |
1892 | return vhost_scsi_set_endpoint(vs, &backend); | |
1893 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1894 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1895 | return -EFAULT; | |
6de7145c MT |
1896 | if (backend.reserved != 0) |
1897 | return -EOPNOTSUPP; | |
057cbf49 NB |
1898 | |
1899 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1900 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1901 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1902 | return -EFAULT; |
1903 | return 0; | |
11c63418 AH |
1904 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1905 | if (get_user(events_missed, eventsp)) | |
1906 | return -EFAULT; | |
1907 | mutex_lock(&vq->mutex); | |
1908 | vs->vs_events_missed = events_missed; | |
1909 | mutex_unlock(&vq->mutex); | |
1910 | return 0; | |
1911 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1912 | mutex_lock(&vq->mutex); | |
1913 | events_missed = vs->vs_events_missed; | |
1914 | mutex_unlock(&vq->mutex); | |
1915 | if (put_user(events_missed, eventsp)) | |
1916 | return -EFAULT; | |
1917 | return 0; | |
057cbf49 | 1918 | case VHOST_GET_FEATURES: |
5dade710 | 1919 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1920 | if (copy_to_user(featurep, &features, sizeof features)) |
1921 | return -EFAULT; | |
1922 | return 0; | |
1923 | case VHOST_SET_FEATURES: | |
1924 | if (copy_from_user(&features, featurep, sizeof features)) | |
1925 | return -EFAULT; | |
1926 | return vhost_scsi_set_features(vs, features); | |
1927 | default: | |
1928 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1929 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1930 | /* TODO: flush backend after dev ioctl. */ | |
1931 | if (r == -ENOIOCTLCMD) | |
1932 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1933 | mutex_unlock(&vs->dev.mutex); |
1934 | return r; | |
1935 | } | |
1936 | } | |
1937 | ||
1938 | static const struct file_operations vhost_scsi_fops = { | |
1939 | .owner = THIS_MODULE, | |
1940 | .release = vhost_scsi_release, | |
1941 | .unlocked_ioctl = vhost_scsi_ioctl, | |
407e9ef7 | 1942 | .compat_ioctl = compat_ptr_ioctl, |
057cbf49 NB |
1943 | .open = vhost_scsi_open, |
1944 | .llseek = noop_llseek, | |
1945 | }; | |
1946 | ||
1947 | static struct miscdevice vhost_scsi_misc = { | |
1948 | MISC_DYNAMIC_MINOR, | |
1949 | "vhost-scsi", | |
1950 | &vhost_scsi_fops, | |
1951 | }; | |
1952 | ||
1953 | static int __init vhost_scsi_register(void) | |
1954 | { | |
1955 | return misc_register(&vhost_scsi_misc); | |
1956 | } | |
1957 | ||
f368ed60 | 1958 | static void vhost_scsi_deregister(void) |
057cbf49 | 1959 | { |
f368ed60 | 1960 | misc_deregister(&vhost_scsi_misc); |
057cbf49 NB |
1961 | } |
1962 | ||
1a1ff825 | 1963 | static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport) |
057cbf49 NB |
1964 | { |
1965 | switch (tport->tport_proto_id) { | |
1966 | case SCSI_PROTOCOL_SAS: | |
1967 | return "SAS"; | |
1968 | case SCSI_PROTOCOL_FCP: | |
1969 | return "FCP"; | |
1970 | case SCSI_PROTOCOL_ISCSI: | |
1971 | return "iSCSI"; | |
1972 | default: | |
1973 | break; | |
1974 | } | |
1975 | ||
1976 | return "Unknown"; | |
1977 | } | |
1978 | ||
683bd967 | 1979 | static void |
1a1ff825 | 1980 | vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg, |
683bd967 | 1981 | struct se_lun *lun, bool plug) |
a6c9af87 AH |
1982 | { |
1983 | ||
1984 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1985 | struct vhost_virtqueue *vq; | |
1986 | u32 reason; | |
1987 | ||
1988 | if (!vs) | |
1989 | return; | |
1990 | ||
1991 | mutex_lock(&vs->dev.mutex); | |
a6c9af87 AH |
1992 | |
1993 | if (plug) | |
1994 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1995 | else | |
1996 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1997 | ||
3ab2e420 | 1998 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 | 1999 | mutex_lock(&vq->mutex); |
ea16c514 | 2000 | if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG)) |
1a1ff825 | 2001 | vhost_scsi_send_evt(vs, tpg, lun, |
ea16c514 | 2002 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); |
a6c9af87 AH |
2003 | mutex_unlock(&vq->mutex); |
2004 | mutex_unlock(&vs->dev.mutex); | |
2005 | } | |
2006 | ||
1a1ff825 | 2007 | static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 2008 | { |
1a1ff825 | 2009 | vhost_scsi_do_plug(tpg, lun, true); |
a6c9af87 AH |
2010 | } |
2011 | ||
1a1ff825 | 2012 | static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 2013 | { |
1a1ff825 | 2014 | vhost_scsi_do_plug(tpg, lun, false); |
a6c9af87 AH |
2015 | } |
2016 | ||
1a1ff825 | 2017 | static int vhost_scsi_port_link(struct se_portal_group *se_tpg, |
683bd967 | 2018 | struct se_lun *lun) |
057cbf49 | 2019 | { |
1a1ff825 NB |
2020 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2021 | struct vhost_scsi_tpg, se_tpg); | |
efd838fe MC |
2022 | struct vhost_scsi_tmf *tmf; |
2023 | ||
2024 | tmf = kzalloc(sizeof(*tmf), GFP_KERNEL); | |
2025 | if (!tmf) | |
2026 | return -ENOMEM; | |
2027 | INIT_LIST_HEAD(&tmf->queue_entry); | |
2028 | vhost_work_init(&tmf->vwork, vhost_scsi_tmf_resp_work); | |
057cbf49 | 2029 | |
1a1ff825 | 2030 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 2031 | |
98718312 AH |
2032 | mutex_lock(&tpg->tv_tpg_mutex); |
2033 | tpg->tv_tpg_port_count++; | |
efd838fe | 2034 | list_add_tail(&tmf->queue_entry, &tpg->tmf_queue); |
98718312 | 2035 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 2036 | |
1a1ff825 | 2037 | vhost_scsi_hotplug(tpg, lun); |
a6c9af87 | 2038 | |
1a1ff825 | 2039 | mutex_unlock(&vhost_scsi_mutex); |
a6c9af87 | 2040 | |
057cbf49 NB |
2041 | return 0; |
2042 | } | |
2043 | ||
1a1ff825 | 2044 | static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg, |
683bd967 | 2045 | struct se_lun *lun) |
057cbf49 | 2046 | { |
1a1ff825 NB |
2047 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2048 | struct vhost_scsi_tpg, se_tpg); | |
efd838fe | 2049 | struct vhost_scsi_tmf *tmf; |
057cbf49 | 2050 | |
1a1ff825 | 2051 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 2052 | |
98718312 AH |
2053 | mutex_lock(&tpg->tv_tpg_mutex); |
2054 | tpg->tv_tpg_port_count--; | |
efd838fe MC |
2055 | tmf = list_first_entry(&tpg->tmf_queue, struct vhost_scsi_tmf, |
2056 | queue_entry); | |
2057 | list_del(&tmf->queue_entry); | |
2058 | kfree(tmf); | |
98718312 | 2059 | mutex_unlock(&tpg->tv_tpg_mutex); |
a6c9af87 | 2060 | |
1a1ff825 | 2061 | vhost_scsi_hotunplug(tpg, lun); |
a6c9af87 | 2062 | |
1a1ff825 | 2063 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 NB |
2064 | } |
2065 | ||
2eafd729 CH |
2066 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store( |
2067 | struct config_item *item, const char *page, size_t count) | |
b1d75fe5 | 2068 | { |
2eafd729 | 2069 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
b1d75fe5 NB |
2070 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2071 | struct vhost_scsi_tpg, se_tpg); | |
2072 | unsigned long val; | |
2073 | int ret = kstrtoul(page, 0, &val); | |
2074 | ||
2075 | if (ret) { | |
2076 | pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); | |
2077 | return ret; | |
2078 | } | |
2079 | if (val != 0 && val != 1 && val != 3) { | |
2080 | pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val); | |
2081 | return -EINVAL; | |
2082 | } | |
2083 | tpg->tv_fabric_prot_type = val; | |
2084 | ||
2085 | return count; | |
2086 | } | |
2087 | ||
2eafd729 CH |
2088 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show( |
2089 | struct config_item *item, char *page) | |
b1d75fe5 | 2090 | { |
2eafd729 | 2091 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
b1d75fe5 NB |
2092 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2093 | struct vhost_scsi_tpg, se_tpg); | |
2094 | ||
2095 | return sprintf(page, "%d\n", tpg->tv_fabric_prot_type); | |
2096 | } | |
2eafd729 CH |
2097 | |
2098 | CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type); | |
b1d75fe5 NB |
2099 | |
2100 | static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = { | |
2eafd729 | 2101 | &vhost_scsi_tpg_attrib_attr_fabric_prot_type, |
b1d75fe5 NB |
2102 | NULL, |
2103 | }; | |
2104 | ||
65ea7898 NB |
2105 | static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg, |
2106 | const char *name) | |
2107 | { | |
65ea7898 NB |
2108 | struct vhost_scsi_nexus *tv_nexus; |
2109 | ||
2110 | mutex_lock(&tpg->tv_tpg_mutex); | |
2111 | if (tpg->tpg_nexus) { | |
2112 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2113 | pr_debug("tpg->tpg_nexus already exists\n"); | |
2114 | return -EEXIST; | |
2115 | } | |
65ea7898 | 2116 | |
473f0b15 | 2117 | tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); |
65ea7898 NB |
2118 | if (!tv_nexus) { |
2119 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2120 | pr_err("Unable to allocate struct vhost_scsi_nexus\n"); | |
2121 | return -ENOMEM; | |
2122 | } | |
057cbf49 NB |
2123 | /* |
2124 | * Since we are running in 'demo mode' this call with generate a | |
1a1ff825 | 2125 | * struct se_node_acl for the vhost_scsi struct se_portal_group with |
057cbf49 NB |
2126 | * the SCSI Initiator port name of the passed configfs group 'name'. |
2127 | */ | |
25b98b64 | 2128 | tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, 0, 0, |
65ea7898 | 2129 | TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS, |
25b98b64 | 2130 | (unsigned char *)name, tv_nexus, NULL); |
65ea7898 | 2131 | if (IS_ERR(tv_nexus->tvn_se_sess)) { |
98718312 | 2132 | mutex_unlock(&tpg->tv_tpg_mutex); |
65ea7898 NB |
2133 | kfree(tv_nexus); |
2134 | return -ENOMEM; | |
057cbf49 | 2135 | } |
98718312 | 2136 | tpg->tpg_nexus = tv_nexus; |
057cbf49 | 2137 | |
98718312 | 2138 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2139 | return 0; |
2140 | } | |
2141 | ||
1a1ff825 | 2142 | static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg) |
057cbf49 NB |
2143 | { |
2144 | struct se_session *se_sess; | |
1a1ff825 | 2145 | struct vhost_scsi_nexus *tv_nexus; |
057cbf49 NB |
2146 | |
2147 | mutex_lock(&tpg->tv_tpg_mutex); | |
2148 | tv_nexus = tpg->tpg_nexus; | |
2149 | if (!tv_nexus) { | |
2150 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2151 | return -ENODEV; | |
2152 | } | |
2153 | ||
2154 | se_sess = tv_nexus->tvn_se_sess; | |
2155 | if (!se_sess) { | |
2156 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2157 | return -ENODEV; | |
2158 | } | |
2159 | ||
101998f6 | 2160 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 2161 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 2162 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 2163 | " active TPG port count: %d\n", |
101998f6 NB |
2164 | tpg->tv_tpg_port_count); |
2165 | return -EBUSY; | |
057cbf49 NB |
2166 | } |
2167 | ||
101998f6 | 2168 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 2169 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 2170 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 2171 | " active TPG vhost count: %d\n", |
101998f6 NB |
2172 | tpg->tv_tpg_vhost_count); |
2173 | return -EBUSY; | |
057cbf49 NB |
2174 | } |
2175 | ||
101998f6 | 2176 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
1a1ff825 | 2177 | " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport), |
057cbf49 | 2178 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
3aee26b4 | 2179 | |
057cbf49 | 2180 | /* |
101998f6 | 2181 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 | 2182 | */ |
25b88550 | 2183 | target_remove_session(se_sess); |
057cbf49 NB |
2184 | tpg->tpg_nexus = NULL; |
2185 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2186 | ||
2187 | kfree(tv_nexus); | |
2188 | return 0; | |
2189 | } | |
2190 | ||
2eafd729 | 2191 | static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page) |
057cbf49 | 2192 | { |
2eafd729 | 2193 | struct se_portal_group *se_tpg = to_tpg(item); |
1a1ff825 NB |
2194 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2195 | struct vhost_scsi_tpg, se_tpg); | |
2196 | struct vhost_scsi_nexus *tv_nexus; | |
057cbf49 NB |
2197 | ssize_t ret; |
2198 | ||
98718312 AH |
2199 | mutex_lock(&tpg->tv_tpg_mutex); |
2200 | tv_nexus = tpg->tpg_nexus; | |
057cbf49 | 2201 | if (!tv_nexus) { |
98718312 | 2202 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2203 | return -ENODEV; |
2204 | } | |
2205 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
2206 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
98718312 | 2207 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2208 | |
2209 | return ret; | |
2210 | } | |
2211 | ||
2eafd729 CH |
2212 | static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item, |
2213 | const char *page, size_t count) | |
057cbf49 | 2214 | { |
2eafd729 | 2215 | struct se_portal_group *se_tpg = to_tpg(item); |
1a1ff825 NB |
2216 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2217 | struct vhost_scsi_tpg, se_tpg); | |
2218 | struct vhost_scsi_tport *tport_wwn = tpg->tport; | |
2219 | unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr; | |
057cbf49 NB |
2220 | int ret; |
2221 | /* | |
2222 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
2223 | */ | |
2224 | if (!strncmp(page, "NULL", 4)) { | |
1a1ff825 | 2225 | ret = vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
2226 | return (!ret) ? count : ret; |
2227 | } | |
2228 | /* | |
2229 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1a1ff825 NB |
2230 | * the fabric protocol_id set in vhost_scsi_make_tport(), and call |
2231 | * vhost_scsi_make_nexus(). | |
057cbf49 | 2232 | */ |
1a1ff825 | 2233 | if (strlen(page) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2234 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
1a1ff825 | 2235 | " max: %d\n", page, VHOST_SCSI_NAMELEN); |
057cbf49 NB |
2236 | return -EINVAL; |
2237 | } | |
1a1ff825 | 2238 | snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page); |
057cbf49 NB |
2239 | |
2240 | ptr = strstr(i_port, "naa."); | |
2241 | if (ptr) { | |
2242 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
2243 | pr_err("Passed SAS Initiator Port %s does not" | |
2244 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2245 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2246 | return -EINVAL; |
2247 | } | |
2248 | port_ptr = &i_port[0]; | |
2249 | goto check_newline; | |
2250 | } | |
2251 | ptr = strstr(i_port, "fc."); | |
2252 | if (ptr) { | |
2253 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
2254 | pr_err("Passed FCP Initiator Port %s does not" | |
2255 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2256 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2257 | return -EINVAL; |
2258 | } | |
2259 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
2260 | goto check_newline; | |
2261 | } | |
2262 | ptr = strstr(i_port, "iqn."); | |
2263 | if (ptr) { | |
2264 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
2265 | pr_err("Passed iSCSI Initiator Port %s does not" | |
2266 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2267 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2268 | return -EINVAL; |
2269 | } | |
2270 | port_ptr = &i_port[0]; | |
2271 | goto check_newline; | |
2272 | } | |
2273 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
2274 | " %s\n", i_port); | |
2275 | return -EINVAL; | |
2276 | /* | |
2277 | * Clear any trailing newline for the NAA WWN | |
2278 | */ | |
2279 | check_newline: | |
2280 | if (i_port[strlen(i_port)-1] == '\n') | |
2281 | i_port[strlen(i_port)-1] = '\0'; | |
2282 | ||
1a1ff825 | 2283 | ret = vhost_scsi_make_nexus(tpg, port_ptr); |
057cbf49 NB |
2284 | if (ret < 0) |
2285 | return ret; | |
2286 | ||
2287 | return count; | |
2288 | } | |
2289 | ||
2eafd729 | 2290 | CONFIGFS_ATTR(vhost_scsi_tpg_, nexus); |
057cbf49 | 2291 | |
1a1ff825 | 2292 | static struct configfs_attribute *vhost_scsi_tpg_attrs[] = { |
2eafd729 | 2293 | &vhost_scsi_tpg_attr_nexus, |
057cbf49 NB |
2294 | NULL, |
2295 | }; | |
2296 | ||
683bd967 | 2297 | static struct se_portal_group * |
aa090eab | 2298 | vhost_scsi_make_tpg(struct se_wwn *wwn, const char *name) |
057cbf49 | 2299 | { |
1a1ff825 NB |
2300 | struct vhost_scsi_tport *tport = container_of(wwn, |
2301 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 | 2302 | |
1a1ff825 | 2303 | struct vhost_scsi_tpg *tpg; |
59c816c1 | 2304 | u16 tpgt; |
057cbf49 NB |
2305 | int ret; |
2306 | ||
2307 | if (strstr(name, "tpgt_") != name) | |
2308 | return ERR_PTR(-EINVAL); | |
59c816c1 | 2309 | if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET) |
057cbf49 NB |
2310 | return ERR_PTR(-EINVAL); |
2311 | ||
473f0b15 | 2312 | tpg = kzalloc(sizeof(*tpg), GFP_KERNEL); |
057cbf49 | 2313 | if (!tpg) { |
1a1ff825 | 2314 | pr_err("Unable to allocate struct vhost_scsi_tpg"); |
057cbf49 NB |
2315 | return ERR_PTR(-ENOMEM); |
2316 | } | |
2317 | mutex_init(&tpg->tv_tpg_mutex); | |
2318 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
efd838fe | 2319 | INIT_LIST_HEAD(&tpg->tmf_queue); |
057cbf49 NB |
2320 | tpg->tport = tport; |
2321 | tpg->tport_tpgt = tpgt; | |
2322 | ||
bc0c94b1 | 2323 | ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id); |
057cbf49 NB |
2324 | if (ret < 0) { |
2325 | kfree(tpg); | |
2326 | return NULL; | |
2327 | } | |
1a1ff825 NB |
2328 | mutex_lock(&vhost_scsi_mutex); |
2329 | list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list); | |
2330 | mutex_unlock(&vhost_scsi_mutex); | |
057cbf49 NB |
2331 | |
2332 | return &tpg->se_tpg; | |
2333 | } | |
2334 | ||
1a1ff825 | 2335 | static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg) |
057cbf49 | 2336 | { |
1a1ff825 NB |
2337 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2338 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 2339 | |
1a1ff825 | 2340 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 2341 | list_del(&tpg->tv_tpg_list); |
1a1ff825 | 2342 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 2343 | /* |
101998f6 | 2344 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 | 2345 | */ |
1a1ff825 | 2346 | vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
2347 | /* |
2348 | * Deregister the se_tpg from TCM.. | |
2349 | */ | |
2350 | core_tpg_deregister(se_tpg); | |
2351 | kfree(tpg); | |
2352 | } | |
2353 | ||
683bd967 | 2354 | static struct se_wwn * |
1a1ff825 | 2355 | vhost_scsi_make_tport(struct target_fabric_configfs *tf, |
683bd967 AH |
2356 | struct config_group *group, |
2357 | const char *name) | |
057cbf49 | 2358 | { |
1a1ff825 | 2359 | struct vhost_scsi_tport *tport; |
057cbf49 NB |
2360 | char *ptr; |
2361 | u64 wwpn = 0; | |
2362 | int off = 0; | |
2363 | ||
1a1ff825 | 2364 | /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0) |
057cbf49 NB |
2365 | return ERR_PTR(-EINVAL); */ |
2366 | ||
473f0b15 | 2367 | tport = kzalloc(sizeof(*tport), GFP_KERNEL); |
057cbf49 | 2368 | if (!tport) { |
1a1ff825 | 2369 | pr_err("Unable to allocate struct vhost_scsi_tport"); |
057cbf49 NB |
2370 | return ERR_PTR(-ENOMEM); |
2371 | } | |
2372 | tport->tport_wwpn = wwpn; | |
2373 | /* | |
2374 | * Determine the emulated Protocol Identifier and Target Port Name | |
2375 | * based on the incoming configfs directory name. | |
2376 | */ | |
2377 | ptr = strstr(name, "naa."); | |
2378 | if (ptr) { | |
2379 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
2380 | goto check_len; | |
2381 | } | |
2382 | ptr = strstr(name, "fc."); | |
2383 | if (ptr) { | |
2384 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
2385 | off = 3; /* Skip over "fc." */ | |
2386 | goto check_len; | |
2387 | } | |
2388 | ptr = strstr(name, "iqn."); | |
2389 | if (ptr) { | |
2390 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
2391 | goto check_len; | |
2392 | } | |
2393 | ||
2394 | pr_err("Unable to locate prefix for emulated Target Port:" | |
2395 | " %s\n", name); | |
2396 | kfree(tport); | |
2397 | return ERR_PTR(-EINVAL); | |
2398 | ||
2399 | check_len: | |
1a1ff825 | 2400 | if (strlen(name) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2401 | pr_err("Emulated %s Address: %s, exceeds" |
1a1ff825 NB |
2402 | " max: %d\n", name, vhost_scsi_dump_proto_id(tport), |
2403 | VHOST_SCSI_NAMELEN); | |
057cbf49 NB |
2404 | kfree(tport); |
2405 | return ERR_PTR(-EINVAL); | |
2406 | } | |
1a1ff825 | 2407 | snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]); |
057cbf49 NB |
2408 | |
2409 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
1a1ff825 | 2410 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name); |
057cbf49 NB |
2411 | |
2412 | return &tport->tport_wwn; | |
2413 | } | |
2414 | ||
1a1ff825 | 2415 | static void vhost_scsi_drop_tport(struct se_wwn *wwn) |
057cbf49 | 2416 | { |
1a1ff825 NB |
2417 | struct vhost_scsi_tport *tport = container_of(wwn, |
2418 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 NB |
2419 | |
2420 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
1a1ff825 | 2421 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), |
057cbf49 NB |
2422 | tport->tport_name); |
2423 | ||
2424 | kfree(tport); | |
2425 | } | |
2426 | ||
683bd967 | 2427 | static ssize_t |
2eafd729 | 2428 | vhost_scsi_wwn_version_show(struct config_item *item, char *page) |
057cbf49 NB |
2429 | { |
2430 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" | |
1a1ff825 | 2431 | "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 NB |
2432 | utsname()->machine); |
2433 | } | |
2434 | ||
2eafd729 | 2435 | CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version); |
057cbf49 | 2436 | |
1a1ff825 | 2437 | static struct configfs_attribute *vhost_scsi_wwn_attrs[] = { |
2eafd729 | 2438 | &vhost_scsi_wwn_attr_version, |
057cbf49 NB |
2439 | NULL, |
2440 | }; | |
2441 | ||
1d822a40 | 2442 | static const struct target_core_fabric_ops vhost_scsi_ops = { |
9ac8928e | 2443 | .module = THIS_MODULE, |
30c7ca93 | 2444 | .fabric_name = "vhost", |
5ae6a6a9 | 2445 | .max_data_sg_nents = VHOST_SCSI_PREALLOC_SGLS, |
1a1ff825 NB |
2446 | .tpg_get_wwn = vhost_scsi_get_fabric_wwn, |
2447 | .tpg_get_tag = vhost_scsi_get_tpgt, | |
1a1ff825 NB |
2448 | .tpg_check_demo_mode = vhost_scsi_check_true, |
2449 | .tpg_check_demo_mode_cache = vhost_scsi_check_true, | |
2450 | .tpg_check_demo_mode_write_protect = vhost_scsi_check_false, | |
2451 | .tpg_check_prod_mode_write_protect = vhost_scsi_check_false, | |
b1d75fe5 | 2452 | .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only, |
1a1ff825 NB |
2453 | .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index, |
2454 | .release_cmd = vhost_scsi_release_cmd, | |
084ed45b | 2455 | .check_stop_free = vhost_scsi_check_stop_free, |
1a1ff825 | 2456 | .sess_get_index = vhost_scsi_sess_get_index, |
057cbf49 | 2457 | .sess_get_initiator_sid = NULL, |
1a1ff825 | 2458 | .write_pending = vhost_scsi_write_pending, |
1a1ff825 | 2459 | .set_default_node_attributes = vhost_scsi_set_default_node_attrs, |
1a1ff825 NB |
2460 | .get_cmd_state = vhost_scsi_get_cmd_state, |
2461 | .queue_data_in = vhost_scsi_queue_data_in, | |
2462 | .queue_status = vhost_scsi_queue_status, | |
2463 | .queue_tm_rsp = vhost_scsi_queue_tm_rsp, | |
2464 | .aborted_task = vhost_scsi_aborted_task, | |
057cbf49 NB |
2465 | /* |
2466 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
2467 | */ | |
1a1ff825 NB |
2468 | .fabric_make_wwn = vhost_scsi_make_tport, |
2469 | .fabric_drop_wwn = vhost_scsi_drop_tport, | |
2470 | .fabric_make_tpg = vhost_scsi_make_tpg, | |
2471 | .fabric_drop_tpg = vhost_scsi_drop_tpg, | |
2472 | .fabric_post_link = vhost_scsi_port_link, | |
2473 | .fabric_pre_unlink = vhost_scsi_port_unlink, | |
9ac8928e CH |
2474 | |
2475 | .tfc_wwn_attrs = vhost_scsi_wwn_attrs, | |
2476 | .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs, | |
2477 | .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs, | |
057cbf49 NB |
2478 | }; |
2479 | ||
9ac8928e | 2480 | static int __init vhost_scsi_init(void) |
057cbf49 | 2481 | { |
9ac8928e | 2482 | int ret = -ENOMEM; |
057cbf49 | 2483 | |
9ac8928e | 2484 | pr_debug("TCM_VHOST fabric module %s on %s/%s" |
1a1ff825 | 2485 | " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 | 2486 | utsname()->machine); |
057cbf49 | 2487 | |
057cbf49 NB |
2488 | ret = vhost_scsi_register(); |
2489 | if (ret < 0) | |
6ec29cb8 | 2490 | goto out; |
057cbf49 | 2491 | |
9ac8928e | 2492 | ret = target_register_template(&vhost_scsi_ops); |
057cbf49 NB |
2493 | if (ret < 0) |
2494 | goto out_vhost_scsi_deregister; | |
2495 | ||
2496 | return 0; | |
2497 | ||
2498 | out_vhost_scsi_deregister: | |
2499 | vhost_scsi_deregister(); | |
057cbf49 NB |
2500 | out: |
2501 | return ret; | |
2502 | }; | |
2503 | ||
1a1ff825 | 2504 | static void vhost_scsi_exit(void) |
057cbf49 | 2505 | { |
9ac8928e | 2506 | target_unregister_template(&vhost_scsi_ops); |
057cbf49 | 2507 | vhost_scsi_deregister(); |
057cbf49 NB |
2508 | }; |
2509 | ||
181c04a3 MT |
2510 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
2511 | MODULE_ALIAS("tcm_vhost"); | |
057cbf49 | 2512 | MODULE_LICENSE("GPL"); |
1a1ff825 NB |
2513 | module_init(vhost_scsi_init); |
2514 | module_exit(vhost_scsi_exit); |