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057cbf49 NB |
1 | /******************************************************************************* |
2 | * Vhost kernel TCM fabric driver for virtio SCSI initiators | |
3 | * | |
4c76251e | 4 | * (C) Copyright 2010-2013 Datera, Inc. |
057cbf49 NB |
5 | * (C) Copyright 2010-2012 IBM Corp. |
6 | * | |
7 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. | |
8 | * | |
4c76251e | 9 | * Authors: Nicholas A. Bellinger <nab@daterainc.com> |
057cbf49 NB |
10 | * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | ****************************************************************************/ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/moduleparam.h> | |
26 | #include <generated/utsrelease.h> | |
27 | #include <linux/utsname.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/kthread.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/configfs.h> | |
34 | #include <linux/ctype.h> | |
35 | #include <linux/compat.h> | |
36 | #include <linux/eventfd.h> | |
057cbf49 NB |
37 | #include <linux/fs.h> |
38 | #include <linux/miscdevice.h> | |
39 | #include <asm/unaligned.h> | |
ba929992 BVA |
40 | #include <scsi/scsi_common.h> |
41 | #include <scsi/scsi_proto.h> | |
057cbf49 NB |
42 | #include <target/target_core_base.h> |
43 | #include <target/target_core_fabric.h> | |
44 | #include <target/target_core_fabric_configfs.h> | |
45 | #include <target/target_core_configfs.h> | |
46 | #include <target/configfs_macros.h> | |
47 | #include <linux/vhost.h> | |
057cbf49 | 48 | #include <linux/virtio_scsi.h> |
9d6064a3 | 49 | #include <linux/llist.h> |
1b7f390e | 50 | #include <linux/bitmap.h> |
4824d3bf | 51 | #include <linux/percpu_ida.h> |
057cbf49 | 52 | |
057cbf49 | 53 | #include "vhost.h" |
5012a3a3 | 54 | |
1a1ff825 NB |
55 | #define VHOST_SCSI_VERSION "v0.1" |
56 | #define VHOST_SCSI_NAMELEN 256 | |
57 | #define VHOST_SCSI_MAX_CDB_SIZE 32 | |
58 | #define VHOST_SCSI_DEFAULT_TAGS 256 | |
59 | #define VHOST_SCSI_PREALLOC_SGLS 2048 | |
60 | #define VHOST_SCSI_PREALLOC_UPAGES 2048 | |
61 | #define VHOST_SCSI_PREALLOC_PROT_SGLS 512 | |
5012a3a3 MT |
62 | |
63 | struct vhost_scsi_inflight { | |
64 | /* Wait for the flush operation to finish */ | |
65 | struct completion comp; | |
66 | /* Refcount for the inflight reqs */ | |
67 | struct kref kref; | |
68 | }; | |
69 | ||
1a1ff825 | 70 | struct vhost_scsi_cmd { |
5012a3a3 MT |
71 | /* Descriptor from vhost_get_vq_desc() for virt_queue segment */ |
72 | int tvc_vq_desc; | |
73 | /* virtio-scsi initiator task attribute */ | |
74 | int tvc_task_attr; | |
79c14141 NB |
75 | /* virtio-scsi response incoming iovecs */ |
76 | int tvc_in_iovs; | |
5012a3a3 MT |
77 | /* virtio-scsi initiator data direction */ |
78 | enum dma_data_direction tvc_data_direction; | |
79 | /* Expected data transfer length from virtio-scsi header */ | |
80 | u32 tvc_exp_data_len; | |
81 | /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */ | |
82 | u64 tvc_tag; | |
83 | /* The number of scatterlists associated with this cmd */ | |
84 | u32 tvc_sgl_count; | |
e31885dd | 85 | u32 tvc_prot_sgl_count; |
1a1ff825 | 86 | /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */ |
5012a3a3 MT |
87 | u32 tvc_lun; |
88 | /* Pointer to the SGL formatted memory from virtio-scsi */ | |
89 | struct scatterlist *tvc_sgl; | |
b1935f68 | 90 | struct scatterlist *tvc_prot_sgl; |
3aee26b4 | 91 | struct page **tvc_upages; |
79c14141 NB |
92 | /* Pointer to response header iovec */ |
93 | struct iovec *tvc_resp_iov; | |
5012a3a3 MT |
94 | /* Pointer to vhost_scsi for our device */ |
95 | struct vhost_scsi *tvc_vhost; | |
96 | /* Pointer to vhost_virtqueue for the cmd */ | |
97 | struct vhost_virtqueue *tvc_vq; | |
98 | /* Pointer to vhost nexus memory */ | |
1a1ff825 | 99 | struct vhost_scsi_nexus *tvc_nexus; |
5012a3a3 MT |
100 | /* The TCM I/O descriptor that is accessed via container_of() */ |
101 | struct se_cmd tvc_se_cmd; | |
1a1ff825 | 102 | /* work item used for cmwq dispatch to vhost_scsi_submission_work() */ |
5012a3a3 MT |
103 | struct work_struct work; |
104 | /* Copy of the incoming SCSI command descriptor block (CDB) */ | |
1a1ff825 | 105 | unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE]; |
5012a3a3 MT |
106 | /* Sense buffer that will be mapped into outgoing status */ |
107 | unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER]; | |
108 | /* Completed commands list, serviced from vhost worker thread */ | |
109 | struct llist_node tvc_completion_list; | |
110 | /* Used to track inflight cmd */ | |
111 | struct vhost_scsi_inflight *inflight; | |
112 | }; | |
113 | ||
1a1ff825 | 114 | struct vhost_scsi_nexus { |
5012a3a3 MT |
115 | /* Pointer to TCM session for I_T Nexus */ |
116 | struct se_session *tvn_se_sess; | |
117 | }; | |
118 | ||
1a1ff825 | 119 | struct vhost_scsi_nacl { |
5012a3a3 MT |
120 | /* Binary World Wide unique Port Name for Vhost Initiator port */ |
121 | u64 iport_wwpn; | |
122 | /* ASCII formatted WWPN for Sas Initiator port */ | |
1a1ff825 NB |
123 | char iport_name[VHOST_SCSI_NAMELEN]; |
124 | /* Returned by vhost_scsi_make_nodeacl() */ | |
5012a3a3 MT |
125 | struct se_node_acl se_node_acl; |
126 | }; | |
127 | ||
1a1ff825 | 128 | struct vhost_scsi_tpg { |
5012a3a3 MT |
129 | /* Vhost port target portal group tag for TCM */ |
130 | u16 tport_tpgt; | |
131 | /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */ | |
132 | int tv_tpg_port_count; | |
133 | /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */ | |
134 | int tv_tpg_vhost_count; | |
b1d75fe5 NB |
135 | /* Used for enabling T10-PI with legacy devices */ |
136 | int tv_fabric_prot_type; | |
1a1ff825 | 137 | /* list for vhost_scsi_list */ |
5012a3a3 MT |
138 | struct list_head tv_tpg_list; |
139 | /* Used to protect access for tpg_nexus */ | |
140 | struct mutex tv_tpg_mutex; | |
141 | /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */ | |
1a1ff825 NB |
142 | struct vhost_scsi_nexus *tpg_nexus; |
143 | /* Pointer back to vhost_scsi_tport */ | |
144 | struct vhost_scsi_tport *tport; | |
145 | /* Returned by vhost_scsi_make_tpg() */ | |
5012a3a3 MT |
146 | struct se_portal_group se_tpg; |
147 | /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */ | |
148 | struct vhost_scsi *vhost_scsi; | |
149 | }; | |
150 | ||
1a1ff825 | 151 | struct vhost_scsi_tport { |
5012a3a3 MT |
152 | /* SCSI protocol the tport is providing */ |
153 | u8 tport_proto_id; | |
154 | /* Binary World Wide unique Port Name for Vhost Target port */ | |
155 | u64 tport_wwpn; | |
156 | /* ASCII formatted WWPN for Vhost Target port */ | |
1a1ff825 NB |
157 | char tport_name[VHOST_SCSI_NAMELEN]; |
158 | /* Returned by vhost_scsi_make_tport() */ | |
5012a3a3 MT |
159 | struct se_wwn tport_wwn; |
160 | }; | |
161 | ||
1a1ff825 | 162 | struct vhost_scsi_evt { |
5012a3a3 MT |
163 | /* event to be sent to guest */ |
164 | struct virtio_scsi_event event; | |
165 | /* event list, serviced from vhost worker thread */ | |
166 | struct llist_node list; | |
167 | }; | |
057cbf49 | 168 | |
101998f6 NB |
169 | enum { |
170 | VHOST_SCSI_VQ_CTL = 0, | |
171 | VHOST_SCSI_VQ_EVT = 1, | |
172 | VHOST_SCSI_VQ_IO = 2, | |
173 | }; | |
174 | ||
e72fd72e | 175 | /* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */ |
5dade710 | 176 | enum { |
95e7c434 | 177 | VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) | |
664ed90e NB |
178 | (1ULL << VIRTIO_SCSI_F_T10_PI) | |
179 | (1ULL << VIRTIO_F_ANY_LAYOUT) | | |
180 | (1ULL << VIRTIO_F_VERSION_1) | |
5dade710 NB |
181 | }; |
182 | ||
1b7f390e AH |
183 | #define VHOST_SCSI_MAX_TARGET 256 |
184 | #define VHOST_SCSI_MAX_VQ 128 | |
a6c9af87 | 185 | #define VHOST_SCSI_MAX_EVENT 128 |
67e18cf9 | 186 | |
3ab2e420 AH |
187 | struct vhost_scsi_virtqueue { |
188 | struct vhost_virtqueue vq; | |
3dfbff32 MT |
189 | /* |
190 | * Reference counting for inflight reqs, used for flush operation. At | |
191 | * each time, one reference tracks new commands submitted, while we | |
192 | * wait for another one to reach 0. | |
193 | */ | |
f2f0173d | 194 | struct vhost_scsi_inflight inflights[2]; |
3dfbff32 MT |
195 | /* |
196 | * Indicate current inflight in use, protected by vq->mutex. | |
197 | * Writers must also take dev mutex and flush under it. | |
198 | */ | |
f2f0173d | 199 | int inflight_idx; |
3ab2e420 AH |
200 | }; |
201 | ||
057cbf49 | 202 | struct vhost_scsi { |
67e18cf9 | 203 | /* Protected by vhost_scsi->dev.mutex */ |
1a1ff825 | 204 | struct vhost_scsi_tpg **vs_tpg; |
67e18cf9 | 205 | char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
67e18cf9 | 206 | |
057cbf49 | 207 | struct vhost_dev dev; |
3ab2e420 | 208 | struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ]; |
057cbf49 NB |
209 | |
210 | struct vhost_work vs_completion_work; /* cmd completion work item */ | |
9d6064a3 | 211 | struct llist_head vs_completion_list; /* cmd completion queue */ |
a6c9af87 AH |
212 | |
213 | struct vhost_work vs_event_work; /* evt injection work item */ | |
214 | struct llist_head vs_event_list; /* evt injection queue */ | |
215 | ||
216 | bool vs_events_missed; /* any missed events, protected by vq->mutex */ | |
217 | int vs_events_nr; /* num of pending events, protected by vq->mutex */ | |
057cbf49 NB |
218 | }; |
219 | ||
9ac8928e | 220 | static struct target_core_fabric_ops vhost_scsi_ops; |
1a1ff825 | 221 | static struct workqueue_struct *vhost_scsi_workqueue; |
057cbf49 | 222 | |
1a1ff825 NB |
223 | /* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */ |
224 | static DEFINE_MUTEX(vhost_scsi_mutex); | |
225 | static LIST_HEAD(vhost_scsi_list); | |
057cbf49 | 226 | |
b4078b5f | 227 | static int iov_num_pages(void __user *iov_base, size_t iov_len) |
765b34fd | 228 | { |
b4078b5f NB |
229 | return (PAGE_ALIGN((unsigned long)iov_base + iov_len) - |
230 | ((unsigned long)iov_base & PAGE_MASK)) >> PAGE_SHIFT; | |
765b34fd AH |
231 | } |
232 | ||
1a1ff825 | 233 | static void vhost_scsi_done_inflight(struct kref *kref) |
f2f0173d AH |
234 | { |
235 | struct vhost_scsi_inflight *inflight; | |
236 | ||
237 | inflight = container_of(kref, struct vhost_scsi_inflight, kref); | |
238 | complete(&inflight->comp); | |
239 | } | |
240 | ||
1a1ff825 | 241 | static void vhost_scsi_init_inflight(struct vhost_scsi *vs, |
f2f0173d AH |
242 | struct vhost_scsi_inflight *old_inflight[]) |
243 | { | |
244 | struct vhost_scsi_inflight *new_inflight; | |
245 | struct vhost_virtqueue *vq; | |
246 | int idx, i; | |
247 | ||
248 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
249 | vq = &vs->vqs[i].vq; | |
250 | ||
251 | mutex_lock(&vq->mutex); | |
252 | ||
253 | /* store old infight */ | |
254 | idx = vs->vqs[i].inflight_idx; | |
255 | if (old_inflight) | |
256 | old_inflight[i] = &vs->vqs[i].inflights[idx]; | |
257 | ||
258 | /* setup new infight */ | |
259 | vs->vqs[i].inflight_idx = idx ^ 1; | |
260 | new_inflight = &vs->vqs[i].inflights[idx ^ 1]; | |
261 | kref_init(&new_inflight->kref); | |
262 | init_completion(&new_inflight->comp); | |
263 | ||
264 | mutex_unlock(&vq->mutex); | |
265 | } | |
266 | } | |
267 | ||
268 | static struct vhost_scsi_inflight * | |
1a1ff825 | 269 | vhost_scsi_get_inflight(struct vhost_virtqueue *vq) |
f2f0173d AH |
270 | { |
271 | struct vhost_scsi_inflight *inflight; | |
272 | struct vhost_scsi_virtqueue *svq; | |
273 | ||
274 | svq = container_of(vq, struct vhost_scsi_virtqueue, vq); | |
275 | inflight = &svq->inflights[svq->inflight_idx]; | |
276 | kref_get(&inflight->kref); | |
277 | ||
278 | return inflight; | |
279 | } | |
280 | ||
1a1ff825 | 281 | static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight) |
f2f0173d | 282 | { |
1a1ff825 | 283 | kref_put(&inflight->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
284 | } |
285 | ||
1a1ff825 | 286 | static int vhost_scsi_check_true(struct se_portal_group *se_tpg) |
057cbf49 NB |
287 | { |
288 | return 1; | |
289 | } | |
290 | ||
1a1ff825 | 291 | static int vhost_scsi_check_false(struct se_portal_group *se_tpg) |
057cbf49 NB |
292 | { |
293 | return 0; | |
294 | } | |
295 | ||
1a1ff825 | 296 | static char *vhost_scsi_get_fabric_name(void) |
057cbf49 NB |
297 | { |
298 | return "vhost"; | |
299 | } | |
300 | ||
1a1ff825 | 301 | static u8 vhost_scsi_get_fabric_proto_ident(struct se_portal_group *se_tpg) |
057cbf49 | 302 | { |
1a1ff825 NB |
303 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
304 | struct vhost_scsi_tpg, se_tpg); | |
305 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
306 | |
307 | switch (tport->tport_proto_id) { | |
308 | case SCSI_PROTOCOL_SAS: | |
309 | return sas_get_fabric_proto_ident(se_tpg); | |
310 | case SCSI_PROTOCOL_FCP: | |
311 | return fc_get_fabric_proto_ident(se_tpg); | |
312 | case SCSI_PROTOCOL_ISCSI: | |
313 | return iscsi_get_fabric_proto_ident(se_tpg); | |
314 | default: | |
315 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
316 | " SAS emulation\n", tport->tport_proto_id); | |
317 | break; | |
318 | } | |
319 | ||
320 | return sas_get_fabric_proto_ident(se_tpg); | |
321 | } | |
322 | ||
1a1ff825 | 323 | static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg) |
057cbf49 | 324 | { |
1a1ff825 NB |
325 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
326 | struct vhost_scsi_tpg, se_tpg); | |
327 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
328 | |
329 | return &tport->tport_name[0]; | |
330 | } | |
331 | ||
1a1ff825 | 332 | static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg) |
057cbf49 | 333 | { |
1a1ff825 NB |
334 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
335 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 NB |
336 | return tpg->tport_tpgt; |
337 | } | |
338 | ||
1a1ff825 | 339 | static u32 vhost_scsi_get_default_depth(struct se_portal_group *se_tpg) |
057cbf49 NB |
340 | { |
341 | return 1; | |
342 | } | |
343 | ||
683bd967 | 344 | static u32 |
1a1ff825 | 345 | vhost_scsi_get_pr_transport_id(struct se_portal_group *se_tpg, |
683bd967 AH |
346 | struct se_node_acl *se_nacl, |
347 | struct t10_pr_registration *pr_reg, | |
348 | int *format_code, | |
349 | unsigned char *buf) | |
057cbf49 | 350 | { |
1a1ff825 NB |
351 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
352 | struct vhost_scsi_tpg, se_tpg); | |
353 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
354 | |
355 | switch (tport->tport_proto_id) { | |
356 | case SCSI_PROTOCOL_SAS: | |
357 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
358 | format_code, buf); | |
359 | case SCSI_PROTOCOL_FCP: | |
360 | return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
361 | format_code, buf); | |
362 | case SCSI_PROTOCOL_ISCSI: | |
363 | return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
364 | format_code, buf); | |
365 | default: | |
366 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
367 | " SAS emulation\n", tport->tport_proto_id); | |
368 | break; | |
369 | } | |
370 | ||
371 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
372 | format_code, buf); | |
373 | } | |
374 | ||
683bd967 | 375 | static u32 |
1a1ff825 | 376 | vhost_scsi_get_pr_transport_id_len(struct se_portal_group *se_tpg, |
683bd967 AH |
377 | struct se_node_acl *se_nacl, |
378 | struct t10_pr_registration *pr_reg, | |
379 | int *format_code) | |
057cbf49 | 380 | { |
1a1ff825 NB |
381 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
382 | struct vhost_scsi_tpg, se_tpg); | |
383 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
384 | |
385 | switch (tport->tport_proto_id) { | |
386 | case SCSI_PROTOCOL_SAS: | |
387 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
388 | format_code); | |
389 | case SCSI_PROTOCOL_FCP: | |
390 | return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
391 | format_code); | |
392 | case SCSI_PROTOCOL_ISCSI: | |
393 | return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
394 | format_code); | |
395 | default: | |
396 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
397 | " SAS emulation\n", tport->tport_proto_id); | |
398 | break; | |
399 | } | |
400 | ||
401 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
402 | format_code); | |
403 | } | |
404 | ||
683bd967 | 405 | static char * |
1a1ff825 | 406 | vhost_scsi_parse_pr_out_transport_id(struct se_portal_group *se_tpg, |
683bd967 AH |
407 | const char *buf, |
408 | u32 *out_tid_len, | |
409 | char **port_nexus_ptr) | |
057cbf49 | 410 | { |
1a1ff825 NB |
411 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
412 | struct vhost_scsi_tpg, se_tpg); | |
413 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
414 | |
415 | switch (tport->tport_proto_id) { | |
416 | case SCSI_PROTOCOL_SAS: | |
417 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
418 | port_nexus_ptr); | |
419 | case SCSI_PROTOCOL_FCP: | |
420 | return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
421 | port_nexus_ptr); | |
422 | case SCSI_PROTOCOL_ISCSI: | |
423 | return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
424 | port_nexus_ptr); | |
425 | default: | |
426 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
427 | " SAS emulation\n", tport->tport_proto_id); | |
428 | break; | |
429 | } | |
430 | ||
431 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
432 | port_nexus_ptr); | |
433 | } | |
434 | ||
b1d75fe5 NB |
435 | static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg) |
436 | { | |
437 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, | |
438 | struct vhost_scsi_tpg, se_tpg); | |
439 | ||
440 | return tpg->tv_fabric_prot_type; | |
441 | } | |
442 | ||
683bd967 | 443 | static struct se_node_acl * |
1a1ff825 | 444 | vhost_scsi_alloc_fabric_acl(struct se_portal_group *se_tpg) |
057cbf49 | 445 | { |
1a1ff825 | 446 | struct vhost_scsi_nacl *nacl; |
057cbf49 | 447 | |
1a1ff825 | 448 | nacl = kzalloc(sizeof(struct vhost_scsi_nacl), GFP_KERNEL); |
057cbf49 | 449 | if (!nacl) { |
1a1ff825 | 450 | pr_err("Unable to allocate struct vhost_scsi_nacl\n"); |
057cbf49 NB |
451 | return NULL; |
452 | } | |
453 | ||
454 | return &nacl->se_node_acl; | |
455 | } | |
456 | ||
683bd967 | 457 | static void |
1a1ff825 | 458 | vhost_scsi_release_fabric_acl(struct se_portal_group *se_tpg, |
683bd967 | 459 | struct se_node_acl *se_nacl) |
057cbf49 | 460 | { |
1a1ff825 NB |
461 | struct vhost_scsi_nacl *nacl = container_of(se_nacl, |
462 | struct vhost_scsi_nacl, se_node_acl); | |
057cbf49 NB |
463 | kfree(nacl); |
464 | } | |
465 | ||
1a1ff825 | 466 | static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg) |
057cbf49 NB |
467 | { |
468 | return 1; | |
469 | } | |
470 | ||
1a1ff825 | 471 | static void vhost_scsi_release_cmd(struct se_cmd *se_cmd) |
057cbf49 | 472 | { |
1a1ff825 NB |
473 | struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd, |
474 | struct vhost_scsi_cmd, tvc_se_cmd); | |
de1419e4 | 475 | struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess; |
e31885dd | 476 | int i; |
084ed45b NB |
477 | |
478 | if (tv_cmd->tvc_sgl_count) { | |
084ed45b NB |
479 | for (i = 0; i < tv_cmd->tvc_sgl_count; i++) |
480 | put_page(sg_page(&tv_cmd->tvc_sgl[i])); | |
d3d665a6 | 481 | } |
e31885dd NB |
482 | if (tv_cmd->tvc_prot_sgl_count) { |
483 | for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++) | |
484 | put_page(sg_page(&tv_cmd->tvc_prot_sgl[i])); | |
485 | } | |
084ed45b | 486 | |
1a1ff825 | 487 | vhost_scsi_put_inflight(tv_cmd->inflight); |
4824d3bf | 488 | percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag); |
057cbf49 NB |
489 | } |
490 | ||
1a1ff825 | 491 | static int vhost_scsi_shutdown_session(struct se_session *se_sess) |
057cbf49 NB |
492 | { |
493 | return 0; | |
494 | } | |
495 | ||
1a1ff825 | 496 | static void vhost_scsi_close_session(struct se_session *se_sess) |
057cbf49 NB |
497 | { |
498 | return; | |
499 | } | |
500 | ||
1a1ff825 | 501 | static u32 vhost_scsi_sess_get_index(struct se_session *se_sess) |
057cbf49 NB |
502 | { |
503 | return 0; | |
504 | } | |
505 | ||
1a1ff825 | 506 | static int vhost_scsi_write_pending(struct se_cmd *se_cmd) |
057cbf49 NB |
507 | { |
508 | /* Go ahead and process the write immediately */ | |
509 | target_execute_cmd(se_cmd); | |
510 | return 0; | |
511 | } | |
512 | ||
1a1ff825 | 513 | static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd) |
057cbf49 NB |
514 | { |
515 | return 0; | |
516 | } | |
517 | ||
1a1ff825 | 518 | static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl) |
057cbf49 NB |
519 | { |
520 | return; | |
521 | } | |
522 | ||
1a1ff825 | 523 | static u32 vhost_scsi_get_task_tag(struct se_cmd *se_cmd) |
057cbf49 NB |
524 | { |
525 | return 0; | |
526 | } | |
527 | ||
1a1ff825 | 528 | static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd) |
057cbf49 NB |
529 | { |
530 | return 0; | |
531 | } | |
532 | ||
1a1ff825 | 533 | static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd) |
101998f6 | 534 | { |
3c63f66a | 535 | struct vhost_scsi *vs = cmd->tvc_vhost; |
101998f6 | 536 | |
3c63f66a | 537 | llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
101998f6 NB |
538 | |
539 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
540 | } | |
057cbf49 | 541 | |
1a1ff825 | 542 | static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd) |
057cbf49 | 543 | { |
1a1ff825 NB |
544 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
545 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 546 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
547 | return 0; |
548 | } | |
549 | ||
1a1ff825 | 550 | static int vhost_scsi_queue_status(struct se_cmd *se_cmd) |
057cbf49 | 551 | { |
1a1ff825 NB |
552 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
553 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 554 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
555 | return 0; |
556 | } | |
557 | ||
1a1ff825 | 558 | static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd) |
057cbf49 | 559 | { |
b79fafac | 560 | return; |
057cbf49 NB |
561 | } |
562 | ||
1a1ff825 | 563 | static void vhost_scsi_aborted_task(struct se_cmd *se_cmd) |
131e6abc NB |
564 | { |
565 | return; | |
566 | } | |
567 | ||
1a1ff825 | 568 | static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 AH |
569 | { |
570 | vs->vs_events_nr--; | |
571 | kfree(evt); | |
572 | } | |
573 | ||
1a1ff825 NB |
574 | static struct vhost_scsi_evt * |
575 | vhost_scsi_allocate_evt(struct vhost_scsi *vs, | |
683bd967 | 576 | u32 event, u32 reason) |
a6c9af87 | 577 | { |
3ab2e420 | 578 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
1a1ff825 | 579 | struct vhost_scsi_evt *evt; |
a6c9af87 AH |
580 | |
581 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
582 | vs->vs_events_missed = true; | |
583 | return NULL; | |
584 | } | |
585 | ||
586 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
587 | if (!evt) { | |
1a1ff825 | 588 | vq_err(vq, "Failed to allocate vhost_scsi_evt\n"); |
a6c9af87 AH |
589 | vs->vs_events_missed = true; |
590 | return NULL; | |
591 | } | |
592 | ||
e72fd72e MT |
593 | evt->event.event = cpu_to_vhost32(vq, event); |
594 | evt->event.reason = cpu_to_vhost32(vq, reason); | |
a6c9af87 AH |
595 | vs->vs_events_nr++; |
596 | ||
597 | return evt; | |
598 | } | |
599 | ||
1a1ff825 | 600 | static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd) |
057cbf49 | 601 | { |
3c63f66a | 602 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
603 | |
604 | /* TODO locking against target/backend threads? */ | |
6c131d0c | 605 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 606 | |
084ed45b | 607 | } |
f2f0173d | 608 | |
084ed45b NB |
609 | static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) |
610 | { | |
611 | return target_put_sess_cmd(se_cmd->se_sess, se_cmd); | |
057cbf49 NB |
612 | } |
613 | ||
683bd967 | 614 | static void |
1a1ff825 | 615 | vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 | 616 | { |
3ab2e420 | 617 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
618 | struct virtio_scsi_event *event = &evt->event; |
619 | struct virtio_scsi_event __user *eventp; | |
620 | unsigned out, in; | |
621 | int head, ret; | |
622 | ||
623 | if (!vq->private_data) { | |
624 | vs->vs_events_missed = true; | |
625 | return; | |
626 | } | |
627 | ||
628 | again: | |
629 | vhost_disable_notify(&vs->dev, vq); | |
47283bef | 630 | head = vhost_get_vq_desc(vq, vq->iov, |
a6c9af87 AH |
631 | ARRAY_SIZE(vq->iov), &out, &in, |
632 | NULL, NULL); | |
633 | if (head < 0) { | |
634 | vs->vs_events_missed = true; | |
635 | return; | |
636 | } | |
637 | if (head == vq->num) { | |
638 | if (vhost_enable_notify(&vs->dev, vq)) | |
639 | goto again; | |
640 | vs->vs_events_missed = true; | |
641 | return; | |
642 | } | |
643 | ||
644 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { | |
645 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", | |
646 | vq->iov[out].iov_len); | |
647 | vs->vs_events_missed = true; | |
648 | return; | |
649 | } | |
650 | ||
651 | if (vs->vs_events_missed) { | |
e72fd72e | 652 | event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED); |
a6c9af87 AH |
653 | vs->vs_events_missed = false; |
654 | } | |
655 | ||
656 | eventp = vq->iov[out].iov_base; | |
657 | ret = __copy_to_user(eventp, event, sizeof(*event)); | |
658 | if (!ret) | |
659 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
660 | else | |
1a1ff825 | 661 | vq_err(vq, "Faulted on vhost_scsi_send_event\n"); |
a6c9af87 AH |
662 | } |
663 | ||
1a1ff825 | 664 | static void vhost_scsi_evt_work(struct vhost_work *work) |
a6c9af87 AH |
665 | { |
666 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
667 | vs_event_work); | |
3ab2e420 | 668 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
1a1ff825 | 669 | struct vhost_scsi_evt *evt; |
a6c9af87 AH |
670 | struct llist_node *llnode; |
671 | ||
672 | mutex_lock(&vq->mutex); | |
673 | llnode = llist_del_all(&vs->vs_event_list); | |
674 | while (llnode) { | |
1a1ff825 | 675 | evt = llist_entry(llnode, struct vhost_scsi_evt, list); |
a6c9af87 | 676 | llnode = llist_next(llnode); |
1a1ff825 NB |
677 | vhost_scsi_do_evt_work(vs, evt); |
678 | vhost_scsi_free_evt(vs, evt); | |
a6c9af87 AH |
679 | } |
680 | mutex_unlock(&vq->mutex); | |
681 | } | |
682 | ||
057cbf49 NB |
683 | /* Fill in status and signal that we are done processing this command |
684 | * | |
685 | * This is scheduled in the vhost work queue so we are called with the owner | |
686 | * process mm and can access the vring. | |
687 | */ | |
688 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) | |
689 | { | |
690 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
691 | vs_completion_work); | |
1b7f390e | 692 | DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 693 | struct virtio_scsi_cmd_resp v_rsp; |
1a1ff825 | 694 | struct vhost_scsi_cmd *cmd; |
9d6064a3 AH |
695 | struct llist_node *llnode; |
696 | struct se_cmd *se_cmd; | |
79c14141 | 697 | struct iov_iter iov_iter; |
1b7f390e | 698 | int ret, vq; |
057cbf49 | 699 | |
1b7f390e | 700 | bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 AH |
701 | llnode = llist_del_all(&vs->vs_completion_list); |
702 | while (llnode) { | |
1a1ff825 | 703 | cmd = llist_entry(llnode, struct vhost_scsi_cmd, |
9d6064a3 AH |
704 | tvc_completion_list); |
705 | llnode = llist_next(llnode); | |
3c63f66a | 706 | se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
707 | |
708 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
3c63f66a | 709 | cmd, se_cmd->residual_count, se_cmd->scsi_status); |
057cbf49 NB |
710 | |
711 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
e72fd72e | 712 | v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count); |
057cbf49 NB |
713 | /* TODO is status_qualifier field needed? */ |
714 | v_rsp.status = se_cmd->scsi_status; | |
e72fd72e MT |
715 | v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq, |
716 | se_cmd->scsi_sense_length); | |
3c63f66a | 717 | memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
e72fd72e | 718 | se_cmd->scsi_sense_length); |
79c14141 NB |
719 | |
720 | iov_iter_init(&iov_iter, READ, cmd->tvc_resp_iov, | |
721 | cmd->tvc_in_iovs, sizeof(v_rsp)); | |
722 | ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter); | |
723 | if (likely(ret == sizeof(v_rsp))) { | |
3ab2e420 | 724 | struct vhost_scsi_virtqueue *q; |
3c63f66a AH |
725 | vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
726 | q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); | |
3ab2e420 | 727 | vq = q - vs->vqs; |
1b7f390e AH |
728 | __set_bit(vq, signal); |
729 | } else | |
057cbf49 NB |
730 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
731 | ||
3c63f66a | 732 | vhost_scsi_free_cmd(cmd); |
057cbf49 NB |
733 | } |
734 | ||
1b7f390e AH |
735 | vq = -1; |
736 | while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) | |
737 | < VHOST_SCSI_MAX_VQ) | |
3ab2e420 | 738 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
739 | } |
740 | ||
1a1ff825 NB |
741 | static struct vhost_scsi_cmd * |
742 | vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg, | |
95e7c434 NB |
743 | unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr, |
744 | u32 exp_data_len, int data_direction) | |
057cbf49 | 745 | { |
1a1ff825 NB |
746 | struct vhost_scsi_cmd *cmd; |
747 | struct vhost_scsi_nexus *tv_nexus; | |
4824d3bf | 748 | struct se_session *se_sess; |
b1935f68 | 749 | struct scatterlist *sg, *prot_sg; |
3aee26b4 | 750 | struct page **pages; |
4824d3bf | 751 | int tag; |
057cbf49 | 752 | |
98718312 | 753 | tv_nexus = tpg->tpg_nexus; |
057cbf49 | 754 | if (!tv_nexus) { |
1a1ff825 | 755 | pr_err("Unable to locate active struct vhost_scsi_nexus\n"); |
057cbf49 NB |
756 | return ERR_PTR(-EIO); |
757 | } | |
4824d3bf | 758 | se_sess = tv_nexus->tvn_se_sess; |
057cbf49 | 759 | |
6f6b5d1e | 760 | tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING); |
4a47d3a1 | 761 | if (tag < 0) { |
1a1ff825 | 762 | pr_err("Unable to obtain tag for vhost_scsi_cmd\n"); |
4a47d3a1 NB |
763 | return ERR_PTR(-ENOMEM); |
764 | } | |
765 | ||
1a1ff825 | 766 | cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag]; |
3aee26b4 | 767 | sg = cmd->tvc_sgl; |
b1935f68 | 768 | prot_sg = cmd->tvc_prot_sgl; |
3aee26b4 | 769 | pages = cmd->tvc_upages; |
1a1ff825 | 770 | memset(cmd, 0, sizeof(struct vhost_scsi_cmd)); |
4824d3bf | 771 | |
3aee26b4 | 772 | cmd->tvc_sgl = sg; |
b1935f68 | 773 | cmd->tvc_prot_sgl = prot_sg; |
3aee26b4 | 774 | cmd->tvc_upages = pages; |
4824d3bf | 775 | cmd->tvc_se_cmd.map_tag = tag; |
95e7c434 NB |
776 | cmd->tvc_tag = scsi_tag; |
777 | cmd->tvc_lun = lun; | |
778 | cmd->tvc_task_attr = task_attr; | |
3c63f66a AH |
779 | cmd->tvc_exp_data_len = exp_data_len; |
780 | cmd->tvc_data_direction = data_direction; | |
781 | cmd->tvc_nexus = tv_nexus; | |
1a1ff825 | 782 | cmd->inflight = vhost_scsi_get_inflight(vq); |
3c63f66a | 783 | |
1a1ff825 | 784 | memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE); |
95e7c434 | 785 | |
3c63f66a | 786 | return cmd; |
057cbf49 NB |
787 | } |
788 | ||
789 | /* | |
790 | * Map a user memory range into a scatterlist | |
791 | * | |
792 | * Returns the number of scatterlist entries used or -errno on error. | |
793 | */ | |
683bd967 | 794 | static int |
1a1ff825 | 795 | vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd, |
b4078b5f NB |
796 | void __user *ptr, |
797 | size_t len, | |
3aee26b4 | 798 | struct scatterlist *sgl, |
5a01d082 | 799 | bool write) |
057cbf49 | 800 | { |
b4078b5f NB |
801 | unsigned int npages = 0, offset, nbytes; |
802 | unsigned int pages_nr = iov_num_pages(ptr, len); | |
057cbf49 | 803 | struct scatterlist *sg = sgl; |
b4078b5f | 804 | struct page **pages = cmd->tvc_upages; |
1810053e | 805 | int ret, i; |
057cbf49 | 806 | |
1a1ff825 | 807 | if (pages_nr > VHOST_SCSI_PREALLOC_UPAGES) { |
3aee26b4 | 808 | pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than" |
1a1ff825 NB |
809 | " preallocated VHOST_SCSI_PREALLOC_UPAGES: %u\n", |
810 | pages_nr, VHOST_SCSI_PREALLOC_UPAGES); | |
3aee26b4 NB |
811 | return -ENOBUFS; |
812 | } | |
813 | ||
1810053e AH |
814 | ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages); |
815 | /* No pages were pinned */ | |
816 | if (ret < 0) | |
817 | goto out; | |
818 | /* Less pages pinned than wanted */ | |
819 | if (ret != pages_nr) { | |
820 | for (i = 0; i < ret; i++) | |
821 | put_page(pages[i]); | |
822 | ret = -EFAULT; | |
823 | goto out; | |
824 | } | |
825 | ||
826 | while (len > 0) { | |
827 | offset = (uintptr_t)ptr & ~PAGE_MASK; | |
828 | nbytes = min_t(unsigned int, PAGE_SIZE - offset, len); | |
829 | sg_set_page(sg, pages[npages], nbytes, offset); | |
057cbf49 NB |
830 | ptr += nbytes; |
831 | len -= nbytes; | |
832 | sg++; | |
833 | npages++; | |
834 | } | |
057cbf49 | 835 | |
1810053e | 836 | out: |
057cbf49 NB |
837 | return ret; |
838 | } | |
839 | ||
683bd967 | 840 | static int |
e8de56b5 | 841 | vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls) |
057cbf49 | 842 | { |
e8de56b5 | 843 | int sgl_count = 0; |
057cbf49 | 844 | |
e8de56b5 NB |
845 | if (!iter || !iter->iov) { |
846 | pr_err("%s: iter->iov is NULL, but expected bytes: %zu" | |
847 | " present\n", __func__, bytes); | |
848 | return -EINVAL; | |
849 | } | |
f3158f36 | 850 | |
e8de56b5 NB |
851 | sgl_count = iov_iter_npages(iter, 0xffff); |
852 | if (sgl_count > max_sgls) { | |
853 | pr_err("%s: requested sgl_count: %d exceeds pre-allocated" | |
854 | " max_sgls: %d\n", __func__, sgl_count, max_sgls); | |
855 | return -EINVAL; | |
5a01d082 | 856 | } |
e8de56b5 NB |
857 | return sgl_count; |
858 | } | |
057cbf49 | 859 | |
e8de56b5 | 860 | static int |
1a1ff825 NB |
861 | vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write, |
862 | struct iov_iter *iter, | |
863 | struct scatterlist *sg, int sg_count) | |
e8de56b5 NB |
864 | { |
865 | size_t off = iter->iov_offset; | |
866 | int i, ret; | |
057cbf49 | 867 | |
e8de56b5 NB |
868 | for (i = 0; i < iter->nr_segs; i++) { |
869 | void __user *base = iter->iov[i].iov_base + off; | |
870 | size_t len = iter->iov[i].iov_len - off; | |
5a01d082 | 871 | |
e8de56b5 | 872 | ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write); |
057cbf49 | 873 | if (ret < 0) { |
e8de56b5 NB |
874 | for (i = 0; i < sg_count; i++) { |
875 | struct page *page = sg_page(&sg[i]); | |
876 | if (page) | |
877 | put_page(page); | |
878 | } | |
057cbf49 NB |
879 | return ret; |
880 | } | |
057cbf49 | 881 | sg += ret; |
e8de56b5 | 882 | off = 0; |
057cbf49 NB |
883 | } |
884 | return 0; | |
885 | } | |
886 | ||
e31885dd | 887 | static int |
1a1ff825 | 888 | vhost_scsi_mapal(struct vhost_scsi_cmd *cmd, |
e8de56b5 NB |
889 | size_t prot_bytes, struct iov_iter *prot_iter, |
890 | size_t data_bytes, struct iov_iter *data_iter) | |
891 | { | |
892 | int sgl_count, ret; | |
893 | bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE); | |
894 | ||
895 | if (prot_bytes) { | |
896 | sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes, | |
1a1ff825 | 897 | VHOST_SCSI_PREALLOC_PROT_SGLS); |
e8de56b5 NB |
898 | if (sgl_count < 0) |
899 | return sgl_count; | |
900 | ||
901 | sg_init_table(cmd->tvc_prot_sgl, sgl_count); | |
902 | cmd->tvc_prot_sgl_count = sgl_count; | |
903 | pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__, | |
904 | cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count); | |
905 | ||
906 | ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter, | |
907 | cmd->tvc_prot_sgl, | |
908 | cmd->tvc_prot_sgl_count); | |
e31885dd | 909 | if (ret < 0) { |
e31885dd NB |
910 | cmd->tvc_prot_sgl_count = 0; |
911 | return ret; | |
912 | } | |
e8de56b5 NB |
913 | } |
914 | sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes, | |
1a1ff825 | 915 | VHOST_SCSI_PREALLOC_SGLS); |
e8de56b5 NB |
916 | if (sgl_count < 0) |
917 | return sgl_count; | |
918 | ||
919 | sg_init_table(cmd->tvc_sgl, sgl_count); | |
920 | cmd->tvc_sgl_count = sgl_count; | |
921 | pr_debug("%s data_sg %p data_sgl_count %u\n", __func__, | |
922 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
923 | ||
924 | ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter, | |
925 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
926 | if (ret < 0) { | |
927 | cmd->tvc_sgl_count = 0; | |
928 | return ret; | |
e31885dd NB |
929 | } |
930 | return 0; | |
931 | } | |
932 | ||
46243860 NB |
933 | static int vhost_scsi_to_tcm_attr(int attr) |
934 | { | |
935 | switch (attr) { | |
936 | case VIRTIO_SCSI_S_SIMPLE: | |
937 | return TCM_SIMPLE_TAG; | |
938 | case VIRTIO_SCSI_S_ORDERED: | |
939 | return TCM_ORDERED_TAG; | |
940 | case VIRTIO_SCSI_S_HEAD: | |
941 | return TCM_HEAD_TAG; | |
942 | case VIRTIO_SCSI_S_ACA: | |
943 | return TCM_ACA_TAG; | |
944 | default: | |
945 | break; | |
946 | } | |
947 | return TCM_SIMPLE_TAG; | |
948 | } | |
949 | ||
1a1ff825 | 950 | static void vhost_scsi_submission_work(struct work_struct *work) |
057cbf49 | 951 | { |
1a1ff825 NB |
952 | struct vhost_scsi_cmd *cmd = |
953 | container_of(work, struct vhost_scsi_cmd, work); | |
954 | struct vhost_scsi_nexus *tv_nexus; | |
3c63f66a | 955 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
95e7c434 NB |
956 | struct scatterlist *sg_ptr, *sg_prot_ptr = NULL; |
957 | int rc; | |
057cbf49 | 958 | |
95e7c434 | 959 | /* FIXME: BIDI operation */ |
3c63f66a AH |
960 | if (cmd->tvc_sgl_count) { |
961 | sg_ptr = cmd->tvc_sgl; | |
95e7c434 NB |
962 | |
963 | if (cmd->tvc_prot_sgl_count) | |
964 | sg_prot_ptr = cmd->tvc_prot_sgl; | |
965 | else | |
966 | se_cmd->prot_pto = true; | |
057cbf49 NB |
967 | } else { |
968 | sg_ptr = NULL; | |
969 | } | |
3c63f66a | 970 | tv_nexus = cmd->tvc_nexus; |
9f0abc15 NB |
971 | |
972 | rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, | |
3c63f66a AH |
973 | cmd->tvc_cdb, &cmd->tvc_sense_buf[0], |
974 | cmd->tvc_lun, cmd->tvc_exp_data_len, | |
46243860 NB |
975 | vhost_scsi_to_tcm_attr(cmd->tvc_task_attr), |
976 | cmd->tvc_data_direction, TARGET_SCF_ACK_KREF, | |
977 | sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr, | |
978 | cmd->tvc_prot_sgl_count); | |
057cbf49 NB |
979 | if (rc < 0) { |
980 | transport_send_check_condition_and_sense(se_cmd, | |
9f0abc15 | 981 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
057cbf49 | 982 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 983 | } |
057cbf49 NB |
984 | } |
985 | ||
683bd967 AH |
986 | static void |
987 | vhost_scsi_send_bad_target(struct vhost_scsi *vs, | |
988 | struct vhost_virtqueue *vq, | |
989 | int head, unsigned out) | |
637ab21e AH |
990 | { |
991 | struct virtio_scsi_cmd_resp __user *resp; | |
992 | struct virtio_scsi_cmd_resp rsp; | |
993 | int ret; | |
994 | ||
995 | memset(&rsp, 0, sizeof(rsp)); | |
996 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
997 | resp = vq->iov[out].iov_base; | |
998 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
999 | if (!ret) | |
1000 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
1001 | else | |
1002 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
1003 | } | |
1004 | ||
683bd967 AH |
1005 | static void |
1006 | vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
057cbf49 | 1007 | { |
1a1ff825 | 1008 | struct vhost_scsi_tpg **vs_tpg, *tpg; |
057cbf49 | 1009 | struct virtio_scsi_cmd_req v_req; |
95e7c434 | 1010 | struct virtio_scsi_cmd_req_pi v_req_pi; |
1a1ff825 | 1011 | struct vhost_scsi_cmd *cmd; |
09b13fa8 | 1012 | struct iov_iter out_iter, in_iter, prot_iter, data_iter; |
95e7c434 | 1013 | u64 tag; |
09b13fa8 NB |
1014 | u32 exp_data_len, data_direction; |
1015 | unsigned out, in; | |
1016 | int head, ret, prot_bytes; | |
1017 | size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp); | |
1018 | size_t out_size, in_size; | |
95e7c434 NB |
1019 | u16 lun; |
1020 | u8 *target, *lunp, task_attr; | |
09b13fa8 | 1021 | bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI); |
95e7c434 | 1022 | void *req, *cdb; |
057cbf49 | 1023 | |
e7802212 | 1024 | mutex_lock(&vq->mutex); |
4f7f46d3 AH |
1025 | /* |
1026 | * We can handle the vq only after the endpoint is setup by calling the | |
1027 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
4f7f46d3 | 1028 | */ |
e7802212 | 1029 | vs_tpg = vq->private_data; |
4f7f46d3 | 1030 | if (!vs_tpg) |
e7802212 | 1031 | goto out; |
057cbf49 | 1032 | |
057cbf49 NB |
1033 | vhost_disable_notify(&vs->dev, vq); |
1034 | ||
1035 | for (;;) { | |
47283bef | 1036 | head = vhost_get_vq_desc(vq, vq->iov, |
09b13fa8 NB |
1037 | ARRAY_SIZE(vq->iov), &out, &in, |
1038 | NULL, NULL); | |
057cbf49 | 1039 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", |
09b13fa8 | 1040 | head, out, in); |
057cbf49 NB |
1041 | /* On error, stop handling until the next kick. */ |
1042 | if (unlikely(head < 0)) | |
1043 | break; | |
1044 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
1045 | if (head == vq->num) { | |
1046 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
1047 | vhost_disable_notify(&vs->dev, vq); | |
1048 | continue; | |
1049 | } | |
1050 | break; | |
1051 | } | |
057cbf49 | 1052 | /* |
09b13fa8 NB |
1053 | * Check for a sane response buffer so we can report early |
1054 | * errors back to the guest. | |
057cbf49 | 1055 | */ |
09b13fa8 NB |
1056 | if (unlikely(vq->iov[out].iov_len < rsp_size)) { |
1057 | vq_err(vq, "Expecting at least virtio_scsi_cmd_resp" | |
1058 | " size, got %zu bytes\n", vq->iov[out].iov_len); | |
057cbf49 NB |
1059 | break; |
1060 | } | |
09b13fa8 NB |
1061 | /* |
1062 | * Setup pointers and values based upon different virtio-scsi | |
1063 | * request header if T10_PI is enabled in KVM guest. | |
1064 | */ | |
1065 | if (t10_pi) { | |
95e7c434 | 1066 | req = &v_req_pi; |
09b13fa8 | 1067 | req_size = sizeof(v_req_pi); |
95e7c434 NB |
1068 | lunp = &v_req_pi.lun[0]; |
1069 | target = &v_req_pi.lun[1]; | |
95e7c434 NB |
1070 | } else { |
1071 | req = &v_req; | |
09b13fa8 | 1072 | req_size = sizeof(v_req); |
95e7c434 NB |
1073 | lunp = &v_req.lun[0]; |
1074 | target = &v_req.lun[1]; | |
95e7c434 | 1075 | } |
09b13fa8 NB |
1076 | /* |
1077 | * FIXME: Not correct for BIDI operation | |
1078 | */ | |
1079 | out_size = iov_length(vq->iov, out); | |
1080 | in_size = iov_length(&vq->iov[out], in); | |
95e7c434 | 1081 | |
09b13fa8 NB |
1082 | /* |
1083 | * Copy over the virtio-scsi request header, which for a | |
1084 | * ANY_LAYOUT enabled guest may span multiple iovecs, or a | |
1085 | * single iovec may contain both the header + outgoing | |
1086 | * WRITE payloads. | |
1087 | * | |
1088 | * copy_from_iter() will advance out_iter, so that it will | |
1089 | * point at the start of the outgoing WRITE payload, if | |
1090 | * DMA_TO_DEVICE is set. | |
1091 | */ | |
1092 | iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size); | |
057cbf49 | 1093 | |
09b13fa8 NB |
1094 | ret = copy_from_iter(req, req_size, &out_iter); |
1095 | if (unlikely(ret != req_size)) { | |
1096 | vq_err(vq, "Faulted on copy_from_iter\n"); | |
de1419e4 NB |
1097 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1098 | continue; | |
057cbf49 | 1099 | } |
7fe412d0 | 1100 | /* virtio-scsi spec requires byte 0 of the lun to be 1 */ |
95e7c434 | 1101 | if (unlikely(*lunp != 1)) { |
09b13fa8 | 1102 | vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp); |
7fe412d0 VS |
1103 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1104 | continue; | |
1105 | } | |
1106 | ||
95e7c434 | 1107 | tpg = ACCESS_ONCE(vs_tpg[*target]); |
98718312 | 1108 | if (unlikely(!tpg)) { |
09b13fa8 | 1109 | /* Target does not exist, fail the request */ |
637ab21e | 1110 | vhost_scsi_send_bad_target(vs, vq, head, out); |
67e18cf9 AH |
1111 | continue; |
1112 | } | |
95e7c434 | 1113 | /* |
09b13fa8 NB |
1114 | * Determine data_direction by calculating the total outgoing |
1115 | * iovec sizes + incoming iovec sizes vs. virtio-scsi request + | |
1116 | * response headers respectively. | |
95e7c434 | 1117 | * |
09b13fa8 NB |
1118 | * For DMA_TO_DEVICE this is out_iter, which is already pointing |
1119 | * to the right place. | |
1120 | * | |
1121 | * For DMA_FROM_DEVICE, the iovec will be just past the end | |
1122 | * of the virtio-scsi response header in either the same | |
1123 | * or immediately following iovec. | |
95e7c434 | 1124 | * |
09b13fa8 NB |
1125 | * Any associated T10_PI bytes for the outgoing / incoming |
1126 | * payloads are included in calculation of exp_data_len here. | |
95e7c434 | 1127 | */ |
09b13fa8 NB |
1128 | prot_bytes = 0; |
1129 | ||
1130 | if (out_size > req_size) { | |
1131 | data_direction = DMA_TO_DEVICE; | |
1132 | exp_data_len = out_size - req_size; | |
1133 | data_iter = out_iter; | |
1134 | } else if (in_size > rsp_size) { | |
1135 | data_direction = DMA_FROM_DEVICE; | |
1136 | exp_data_len = in_size - rsp_size; | |
1137 | ||
1138 | iov_iter_init(&in_iter, READ, &vq->iov[out], in, | |
1139 | rsp_size + exp_data_len); | |
1140 | iov_iter_advance(&in_iter, rsp_size); | |
1141 | data_iter = in_iter; | |
1142 | } else { | |
1143 | data_direction = DMA_NONE; | |
1144 | exp_data_len = 0; | |
1145 | } | |
1146 | /* | |
1147 | * If T10_PI header + payload is present, setup prot_iter values | |
1148 | * and recalculate data_iter for vhost_scsi_mapal() mapping to | |
1149 | * host scatterlists via get_user_pages_fast(). | |
95e7c434 | 1150 | */ |
09b13fa8 | 1151 | if (t10_pi) { |
95e7c434 NB |
1152 | if (v_req_pi.pi_bytesout) { |
1153 | if (data_direction != DMA_TO_DEVICE) { | |
09b13fa8 NB |
1154 | vq_err(vq, "Received non zero pi_bytesout," |
1155 | " but wrong data_direction\n"); | |
de1419e4 NB |
1156 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1157 | continue; | |
95e7c434 | 1158 | } |
e72fd72e | 1159 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout); |
95e7c434 NB |
1160 | } else if (v_req_pi.pi_bytesin) { |
1161 | if (data_direction != DMA_FROM_DEVICE) { | |
09b13fa8 NB |
1162 | vq_err(vq, "Received non zero pi_bytesin," |
1163 | " but wrong data_direction\n"); | |
de1419e4 NB |
1164 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1165 | continue; | |
95e7c434 | 1166 | } |
e72fd72e | 1167 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin); |
95e7c434 | 1168 | } |
09b13fa8 NB |
1169 | /* |
1170 | * Set prot_iter to data_iter, and advance past any | |
1171 | * preceeding prot_bytes that may be present. | |
1172 | * | |
1173 | * Also fix up the exp_data_len to reflect only the | |
1174 | * actual data payload length. | |
1175 | */ | |
95e7c434 | 1176 | if (prot_bytes) { |
09b13fa8 NB |
1177 | exp_data_len -= prot_bytes; |
1178 | prot_iter = data_iter; | |
1179 | iov_iter_advance(&data_iter, prot_bytes); | |
95e7c434 | 1180 | } |
e72fd72e | 1181 | tag = vhost64_to_cpu(vq, v_req_pi.tag); |
95e7c434 NB |
1182 | task_attr = v_req_pi.task_attr; |
1183 | cdb = &v_req_pi.cdb[0]; | |
1184 | lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF; | |
1185 | } else { | |
e72fd72e | 1186 | tag = vhost64_to_cpu(vq, v_req.tag); |
95e7c434 NB |
1187 | task_attr = v_req.task_attr; |
1188 | cdb = &v_req.cdb[0]; | |
1189 | lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; | |
1190 | } | |
95e7c434 | 1191 | /* |
09b13fa8 NB |
1192 | * Check that the received CDB size does not exceeded our |
1193 | * hardcoded max for vhost-scsi, then get a pre-allocated | |
1194 | * cmd descriptor for the new virtio-scsi tag. | |
95e7c434 NB |
1195 | * |
1196 | * TODO what if cdb was too small for varlen cdb header? | |
1197 | */ | |
1a1ff825 | 1198 | if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) { |
95e7c434 NB |
1199 | vq_err(vq, "Received SCSI CDB with command_size: %d that" |
1200 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
1a1ff825 | 1201 | scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE); |
de1419e4 NB |
1202 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1203 | continue; | |
95e7c434 | 1204 | } |
95e7c434 | 1205 | cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr, |
9f977ef7 NB |
1206 | exp_data_len + prot_bytes, |
1207 | data_direction); | |
3c63f66a | 1208 | if (IS_ERR(cmd)) { |
4824d3bf | 1209 | vq_err(vq, "vhost_scsi_get_tag failed %ld\n", |
09b13fa8 | 1210 | PTR_ERR(cmd)); |
de1419e4 NB |
1211 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1212 | continue; | |
057cbf49 | 1213 | } |
3c63f66a AH |
1214 | cmd->tvc_vhost = vs; |
1215 | cmd->tvc_vq = vq; | |
79c14141 NB |
1216 | cmd->tvc_resp_iov = &vq->iov[out]; |
1217 | cmd->tvc_in_iovs = in; | |
057cbf49 | 1218 | |
057cbf49 | 1219 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", |
09b13fa8 NB |
1220 | cmd->tvc_cdb[0], cmd->tvc_lun); |
1221 | pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:" | |
1222 | " %d\n", cmd, exp_data_len, prot_bytes, data_direction); | |
057cbf49 NB |
1223 | |
1224 | if (data_direction != DMA_NONE) { | |
09b13fa8 NB |
1225 | ret = vhost_scsi_mapal(cmd, |
1226 | prot_bytes, &prot_iter, | |
1227 | exp_data_len, &data_iter); | |
057cbf49 NB |
1228 | if (unlikely(ret)) { |
1229 | vq_err(vq, "Failed to map iov to sgl\n"); | |
1a1ff825 | 1230 | vhost_scsi_release_cmd(&cmd->tvc_se_cmd); |
de1419e4 NB |
1231 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1232 | continue; | |
057cbf49 NB |
1233 | } |
1234 | } | |
057cbf49 NB |
1235 | /* |
1236 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
1237 | * complete the virtio-scsi request in TCM callback context via | |
09b13fa8 | 1238 | * vhost_scsi_queue_data_in() and vhost_scsi_queue_status() |
057cbf49 | 1239 | */ |
3c63f66a | 1240 | cmd->tvc_vq_desc = head; |
057cbf49 | 1241 | /* |
09b13fa8 NB |
1242 | * Dispatch cmd descriptor for cmwq execution in process |
1243 | * context provided by vhost_scsi_workqueue. This also ensures | |
1244 | * cmd is executed on the same kworker CPU as this vhost | |
1245 | * thread to gain positive L2 cache locality effects. | |
057cbf49 | 1246 | */ |
1a1ff825 NB |
1247 | INIT_WORK(&cmd->work, vhost_scsi_submission_work); |
1248 | queue_work(vhost_scsi_workqueue, &cmd->work); | |
057cbf49 | 1249 | } |
e7802212 | 1250 | out: |
7ea206cf | 1251 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
1252 | } |
1253 | ||
1254 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) | |
1255 | { | |
101998f6 | 1256 | pr_debug("%s: The handling func for control queue.\n", __func__); |
057cbf49 NB |
1257 | } |
1258 | ||
683bd967 | 1259 | static void |
1a1ff825 NB |
1260 | vhost_scsi_send_evt(struct vhost_scsi *vs, |
1261 | struct vhost_scsi_tpg *tpg, | |
683bd967 AH |
1262 | struct se_lun *lun, |
1263 | u32 event, | |
1264 | u32 reason) | |
a6c9af87 | 1265 | { |
1a1ff825 | 1266 | struct vhost_scsi_evt *evt; |
a6c9af87 | 1267 | |
1a1ff825 | 1268 | evt = vhost_scsi_allocate_evt(vs, event, reason); |
a6c9af87 AH |
1269 | if (!evt) |
1270 | return; | |
1271 | ||
1272 | if (tpg && lun) { | |
1273 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
1274 | /* | |
1275 | * Note: evt->event is zeroed when we allocate it and | |
1276 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
1277 | */ | |
1278 | evt->event.lun[0] = 0x01; | |
59c816c1 | 1279 | evt->event.lun[1] = tpg->tport_tpgt; |
a6c9af87 AH |
1280 | if (lun->unpacked_lun >= 256) |
1281 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
1282 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
1283 | } | |
1284 | ||
1285 | llist_add(&evt->list, &vs->vs_event_list); | |
1286 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
1287 | } | |
1288 | ||
057cbf49 NB |
1289 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
1290 | { | |
a6c9af87 AH |
1291 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1292 | poll.work); | |
1293 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1294 | ||
1295 | mutex_lock(&vq->mutex); | |
1296 | if (!vq->private_data) | |
1297 | goto out; | |
1298 | ||
1299 | if (vs->vs_events_missed) | |
1a1ff825 | 1300 | vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); |
a6c9af87 AH |
1301 | out: |
1302 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
1303 | } |
1304 | ||
1305 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
1306 | { | |
1307 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
1308 | poll.work); | |
1309 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1310 | ||
1b7f390e | 1311 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
1312 | } |
1313 | ||
4f7f46d3 AH |
1314 | static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
1315 | { | |
3ab2e420 | 1316 | vhost_poll_flush(&vs->vqs[index].vq.poll); |
4f7f46d3 AH |
1317 | } |
1318 | ||
3dfbff32 | 1319 | /* Callers must hold dev mutex */ |
4f7f46d3 AH |
1320 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
1321 | { | |
f2f0173d | 1322 | struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; |
4f7f46d3 AH |
1323 | int i; |
1324 | ||
f2f0173d | 1325 | /* Init new inflight and remember the old inflight */ |
1a1ff825 | 1326 | vhost_scsi_init_inflight(vs, old_inflight); |
f2f0173d AH |
1327 | |
1328 | /* | |
1329 | * The inflight->kref was initialized to 1. We decrement it here to | |
1330 | * indicate the start of the flush operation so that it will reach 0 | |
1331 | * when all the reqs are finished. | |
1332 | */ | |
1333 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1a1ff825 | 1334 | kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
1335 | |
1336 | /* Flush both the vhost poll and vhost work */ | |
4f7f46d3 AH |
1337 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
1338 | vhost_scsi_flush_vq(vs, i); | |
1339 | vhost_work_flush(&vs->dev, &vs->vs_completion_work); | |
a6c9af87 | 1340 | vhost_work_flush(&vs->dev, &vs->vs_event_work); |
f2f0173d AH |
1341 | |
1342 | /* Wait for all reqs issued before the flush to be finished */ | |
1343 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1344 | wait_for_completion(&old_inflight[i]->comp); | |
4f7f46d3 AH |
1345 | } |
1346 | ||
057cbf49 NB |
1347 | /* |
1348 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
1a1ff825 | 1349 | * vhost_scsi_tpg with an active struct vhost_scsi_nexus |
f2b7daf5 AH |
1350 | * |
1351 | * The lock nesting rule is: | |
1a1ff825 | 1352 | * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex |
057cbf49 | 1353 | */ |
683bd967 AH |
1354 | static int |
1355 | vhost_scsi_set_endpoint(struct vhost_scsi *vs, | |
1356 | struct vhost_scsi_target *t) | |
057cbf49 | 1357 | { |
ab8edab1 | 1358 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1359 | struct vhost_scsi_tport *tv_tport; |
1360 | struct vhost_scsi_tpg *tpg; | |
1361 | struct vhost_scsi_tpg **vs_tpg; | |
4f7f46d3 AH |
1362 | struct vhost_virtqueue *vq; |
1363 | int index, ret, i, len; | |
67e18cf9 | 1364 | bool match = false; |
057cbf49 | 1365 | |
1a1ff825 | 1366 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 1367 | mutex_lock(&vs->dev.mutex); |
f2b7daf5 | 1368 | |
057cbf49 NB |
1369 | /* Verify that ring has been setup correctly. */ |
1370 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
1371 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 1372 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
1373 | ret = -EFAULT; |
1374 | goto out; | |
057cbf49 NB |
1375 | } |
1376 | } | |
057cbf49 | 1377 | |
4f7f46d3 AH |
1378 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
1379 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
1380 | if (!vs_tpg) { | |
f2b7daf5 AH |
1381 | ret = -ENOMEM; |
1382 | goto out; | |
4f7f46d3 AH |
1383 | } |
1384 | if (vs->vs_tpg) | |
1385 | memcpy(vs_tpg, vs->vs_tpg, len); | |
1386 | ||
1a1ff825 | 1387 | list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) { |
98718312 AH |
1388 | mutex_lock(&tpg->tv_tpg_mutex); |
1389 | if (!tpg->tpg_nexus) { | |
1390 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1391 | continue; |
1392 | } | |
98718312 AH |
1393 | if (tpg->tv_tpg_vhost_count != 0) { |
1394 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1395 | continue; |
1396 | } | |
98718312 | 1397 | tv_tport = tpg->tport; |
057cbf49 | 1398 | |
67e18cf9 | 1399 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
98718312 | 1400 | if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
4f7f46d3 | 1401 | kfree(vs_tpg); |
98718312 | 1402 | mutex_unlock(&tpg->tv_tpg_mutex); |
f2b7daf5 AH |
1403 | ret = -EEXIST; |
1404 | goto out; | |
101998f6 | 1405 | } |
ab8edab1 NB |
1406 | /* |
1407 | * In order to ensure individual vhost-scsi configfs | |
1408 | * groups cannot be removed while in use by vhost ioctl, | |
1409 | * go ahead and take an explicit se_tpg->tpg_group.cg_item | |
1410 | * dependency now. | |
1411 | */ | |
1412 | se_tpg = &tpg->se_tpg; | |
1413 | ret = configfs_depend_item(se_tpg->se_tpg_tfo->tf_subsys, | |
1414 | &se_tpg->tpg_group.cg_item); | |
1415 | if (ret) { | |
1416 | pr_warn("configfs_depend_item() failed: %d\n", ret); | |
1417 | kfree(vs_tpg); | |
1418 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1419 | goto out; | |
1420 | } | |
98718312 AH |
1421 | tpg->tv_tpg_vhost_count++; |
1422 | tpg->vhost_scsi = vs; | |
1423 | vs_tpg[tpg->tport_tpgt] = tpg; | |
4e857c58 | 1424 | smp_mb__after_atomic(); |
67e18cf9 | 1425 | match = true; |
057cbf49 | 1426 | } |
98718312 | 1427 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1428 | } |
67e18cf9 AH |
1429 | |
1430 | if (match) { | |
1431 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1432 | sizeof(vs->vs_vhost_wwpn)); | |
4f7f46d3 | 1433 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
3ab2e420 | 1434 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1435 | mutex_lock(&vq->mutex); |
22fa90c7 | 1436 | vq->private_data = vs_tpg; |
dfd5d569 | 1437 | vhost_init_used(vq); |
4f7f46d3 AH |
1438 | mutex_unlock(&vq->mutex); |
1439 | } | |
67e18cf9 AH |
1440 | ret = 0; |
1441 | } else { | |
1442 | ret = -EEXIST; | |
1443 | } | |
1444 | ||
4f7f46d3 AH |
1445 | /* |
1446 | * Act as synchronize_rcu to make sure access to | |
1447 | * old vs->vs_tpg is finished. | |
1448 | */ | |
1449 | vhost_scsi_flush(vs); | |
1450 | kfree(vs->vs_tpg); | |
1451 | vs->vs_tpg = vs_tpg; | |
1452 | ||
f2b7daf5 | 1453 | out: |
67e18cf9 | 1454 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1455 | mutex_unlock(&vhost_scsi_mutex); |
67e18cf9 | 1456 | return ret; |
057cbf49 NB |
1457 | } |
1458 | ||
683bd967 AH |
1459 | static int |
1460 | vhost_scsi_clear_endpoint(struct vhost_scsi *vs, | |
1461 | struct vhost_scsi_target *t) | |
057cbf49 | 1462 | { |
ab8edab1 | 1463 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1464 | struct vhost_scsi_tport *tv_tport; |
1465 | struct vhost_scsi_tpg *tpg; | |
4f7f46d3 AH |
1466 | struct vhost_virtqueue *vq; |
1467 | bool match = false; | |
67e18cf9 AH |
1468 | int index, ret, i; |
1469 | u8 target; | |
057cbf49 | 1470 | |
1a1ff825 | 1471 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 NB |
1472 | mutex_lock(&vs->dev.mutex); |
1473 | /* Verify that ring has been setup correctly. */ | |
1474 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1475 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1476 | ret = -EFAULT; |
038e0af4 | 1477 | goto err_dev; |
057cbf49 NB |
1478 | } |
1479 | } | |
4f7f46d3 AH |
1480 | |
1481 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1482 | ret = 0; |
1483 | goto err_dev; | |
4f7f46d3 AH |
1484 | } |
1485 | ||
67e18cf9 AH |
1486 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1487 | target = i; | |
98718312 AH |
1488 | tpg = vs->vs_tpg[target]; |
1489 | if (!tpg) | |
67e18cf9 AH |
1490 | continue; |
1491 | ||
98718312 AH |
1492 | mutex_lock(&tpg->tv_tpg_mutex); |
1493 | tv_tport = tpg->tport; | |
67e18cf9 AH |
1494 | if (!tv_tport) { |
1495 | ret = -ENODEV; | |
038e0af4 | 1496 | goto err_tpg; |
67e18cf9 AH |
1497 | } |
1498 | ||
1499 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
98718312 | 1500 | pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" |
67e18cf9 | 1501 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", |
98718312 | 1502 | tv_tport->tport_name, tpg->tport_tpgt, |
67e18cf9 AH |
1503 | t->vhost_wwpn, t->vhost_tpgt); |
1504 | ret = -EINVAL; | |
038e0af4 | 1505 | goto err_tpg; |
67e18cf9 | 1506 | } |
98718312 AH |
1507 | tpg->tv_tpg_vhost_count--; |
1508 | tpg->vhost_scsi = NULL; | |
67e18cf9 | 1509 | vs->vs_tpg[target] = NULL; |
4f7f46d3 | 1510 | match = true; |
98718312 | 1511 | mutex_unlock(&tpg->tv_tpg_mutex); |
ab8edab1 NB |
1512 | /* |
1513 | * Release se_tpg->tpg_group.cg_item configfs dependency now | |
1514 | * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur. | |
1515 | */ | |
1516 | se_tpg = &tpg->se_tpg; | |
1517 | configfs_undepend_item(se_tpg->se_tpg_tfo->tf_subsys, | |
1518 | &se_tpg->tpg_group.cg_item); | |
057cbf49 | 1519 | } |
4f7f46d3 AH |
1520 | if (match) { |
1521 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
3ab2e420 | 1522 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1523 | mutex_lock(&vq->mutex); |
22fa90c7 | 1524 | vq->private_data = NULL; |
4f7f46d3 AH |
1525 | mutex_unlock(&vq->mutex); |
1526 | } | |
1527 | } | |
1528 | /* | |
1529 | * Act as synchronize_rcu to make sure access to | |
1530 | * old vs->vs_tpg is finished. | |
1531 | */ | |
1532 | vhost_scsi_flush(vs); | |
1533 | kfree(vs->vs_tpg); | |
1534 | vs->vs_tpg = NULL; | |
a6c9af87 | 1535 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1536 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1537 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 1538 | return 0; |
101998f6 | 1539 | |
038e0af4 | 1540 | err_tpg: |
98718312 | 1541 | mutex_unlock(&tpg->tv_tpg_mutex); |
038e0af4 | 1542 | err_dev: |
101998f6 | 1543 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1544 | mutex_unlock(&vhost_scsi_mutex); |
101998f6 | 1545 | return ret; |
057cbf49 NB |
1546 | } |
1547 | ||
4f7f46d3 AH |
1548 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1549 | { | |
ea16c514 MT |
1550 | struct vhost_virtqueue *vq; |
1551 | int i; | |
1552 | ||
4f7f46d3 AH |
1553 | if (features & ~VHOST_SCSI_FEATURES) |
1554 | return -EOPNOTSUPP; | |
1555 | ||
1556 | mutex_lock(&vs->dev.mutex); | |
1557 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1558 | !vhost_log_access_ok(&vs->dev)) { | |
1559 | mutex_unlock(&vs->dev.mutex); | |
1560 | return -EFAULT; | |
1561 | } | |
ea16c514 MT |
1562 | |
1563 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
1564 | vq = &vs->vqs[i].vq; | |
1565 | mutex_lock(&vq->mutex); | |
1566 | vq->acked_features = features; | |
1567 | mutex_unlock(&vq->mutex); | |
1568 | } | |
4f7f46d3 AH |
1569 | mutex_unlock(&vs->dev.mutex); |
1570 | return 0; | |
1571 | } | |
1572 | ||
057cbf49 NB |
1573 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1574 | { | |
c7289312 | 1575 | struct vhost_scsi *vs; |
3ab2e420 | 1576 | struct vhost_virtqueue **vqs; |
595cb754 | 1577 | int r = -ENOMEM, i; |
057cbf49 | 1578 | |
595cb754 MT |
1579 | vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
1580 | if (!vs) { | |
1581 | vs = vzalloc(sizeof(*vs)); | |
1582 | if (!vs) | |
1583 | goto err_vs; | |
1584 | } | |
057cbf49 | 1585 | |
3ab2e420 | 1586 | vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL); |
595cb754 MT |
1587 | if (!vqs) |
1588 | goto err_vqs; | |
3ab2e420 | 1589 | |
c7289312 | 1590 | vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); |
1a1ff825 | 1591 | vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work); |
a6c9af87 | 1592 | |
c7289312 AH |
1593 | vs->vs_events_nr = 0; |
1594 | vs->vs_events_missed = false; | |
057cbf49 | 1595 | |
c7289312 AH |
1596 | vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; |
1597 | vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1598 | vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1599 | vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
3ab2e420 | 1600 | for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { |
c7289312 AH |
1601 | vqs[i] = &vs->vqs[i].vq; |
1602 | vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
3ab2e420 | 1603 | } |
59566b6e | 1604 | vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ); |
f2f0173d | 1605 | |
1a1ff825 | 1606 | vhost_scsi_init_inflight(vs, NULL); |
f2f0173d | 1607 | |
c7289312 | 1608 | f->private_data = vs; |
057cbf49 | 1609 | return 0; |
595cb754 | 1610 | |
595cb754 | 1611 | err_vqs: |
68404441 | 1612 | kvfree(vs); |
595cb754 MT |
1613 | err_vs: |
1614 | return r; | |
057cbf49 NB |
1615 | } |
1616 | ||
1617 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1618 | { | |
c7289312 | 1619 | struct vhost_scsi *vs = f->private_data; |
67e18cf9 | 1620 | struct vhost_scsi_target t; |
057cbf49 | 1621 | |
c7289312 AH |
1622 | mutex_lock(&vs->dev.mutex); |
1623 | memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1624 | mutex_unlock(&vs->dev.mutex); | |
1625 | vhost_scsi_clear_endpoint(vs, &t); | |
1626 | vhost_dev_stop(&vs->dev); | |
1627 | vhost_dev_cleanup(&vs->dev, false); | |
a6c9af87 | 1628 | /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
c7289312 AH |
1629 | vhost_scsi_flush(vs); |
1630 | kfree(vs->dev.vqs); | |
68404441 | 1631 | kvfree(vs); |
057cbf49 NB |
1632 | return 0; |
1633 | } | |
1634 | ||
683bd967 AH |
1635 | static long |
1636 | vhost_scsi_ioctl(struct file *f, | |
1637 | unsigned int ioctl, | |
1638 | unsigned long arg) | |
057cbf49 NB |
1639 | { |
1640 | struct vhost_scsi *vs = f->private_data; | |
1641 | struct vhost_scsi_target backend; | |
1642 | void __user *argp = (void __user *)arg; | |
1643 | u64 __user *featurep = argp; | |
11c63418 AH |
1644 | u32 __user *eventsp = argp; |
1645 | u32 events_missed; | |
057cbf49 | 1646 | u64 features; |
101998f6 | 1647 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1648 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1649 | |
1650 | switch (ioctl) { | |
1651 | case VHOST_SCSI_SET_ENDPOINT: | |
1652 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1653 | return -EFAULT; | |
6de7145c MT |
1654 | if (backend.reserved != 0) |
1655 | return -EOPNOTSUPP; | |
057cbf49 NB |
1656 | |
1657 | return vhost_scsi_set_endpoint(vs, &backend); | |
1658 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1659 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1660 | return -EFAULT; | |
6de7145c MT |
1661 | if (backend.reserved != 0) |
1662 | return -EOPNOTSUPP; | |
057cbf49 NB |
1663 | |
1664 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1665 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1666 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1667 | return -EFAULT; |
1668 | return 0; | |
11c63418 AH |
1669 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1670 | if (get_user(events_missed, eventsp)) | |
1671 | return -EFAULT; | |
1672 | mutex_lock(&vq->mutex); | |
1673 | vs->vs_events_missed = events_missed; | |
1674 | mutex_unlock(&vq->mutex); | |
1675 | return 0; | |
1676 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1677 | mutex_lock(&vq->mutex); | |
1678 | events_missed = vs->vs_events_missed; | |
1679 | mutex_unlock(&vq->mutex); | |
1680 | if (put_user(events_missed, eventsp)) | |
1681 | return -EFAULT; | |
1682 | return 0; | |
057cbf49 | 1683 | case VHOST_GET_FEATURES: |
5dade710 | 1684 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1685 | if (copy_to_user(featurep, &features, sizeof features)) |
1686 | return -EFAULT; | |
1687 | return 0; | |
1688 | case VHOST_SET_FEATURES: | |
1689 | if (copy_from_user(&features, featurep, sizeof features)) | |
1690 | return -EFAULT; | |
1691 | return vhost_scsi_set_features(vs, features); | |
1692 | default: | |
1693 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1694 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1695 | /* TODO: flush backend after dev ioctl. */ | |
1696 | if (r == -ENOIOCTLCMD) | |
1697 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1698 | mutex_unlock(&vs->dev.mutex); |
1699 | return r; | |
1700 | } | |
1701 | } | |
1702 | ||
101998f6 NB |
1703 | #ifdef CONFIG_COMPAT |
1704 | static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, | |
1705 | unsigned long arg) | |
1706 | { | |
1707 | return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1708 | } | |
1709 | #endif | |
1710 | ||
057cbf49 NB |
1711 | static const struct file_operations vhost_scsi_fops = { |
1712 | .owner = THIS_MODULE, | |
1713 | .release = vhost_scsi_release, | |
1714 | .unlocked_ioctl = vhost_scsi_ioctl, | |
101998f6 NB |
1715 | #ifdef CONFIG_COMPAT |
1716 | .compat_ioctl = vhost_scsi_compat_ioctl, | |
1717 | #endif | |
057cbf49 NB |
1718 | .open = vhost_scsi_open, |
1719 | .llseek = noop_llseek, | |
1720 | }; | |
1721 | ||
1722 | static struct miscdevice vhost_scsi_misc = { | |
1723 | MISC_DYNAMIC_MINOR, | |
1724 | "vhost-scsi", | |
1725 | &vhost_scsi_fops, | |
1726 | }; | |
1727 | ||
1728 | static int __init vhost_scsi_register(void) | |
1729 | { | |
1730 | return misc_register(&vhost_scsi_misc); | |
1731 | } | |
1732 | ||
1733 | static int vhost_scsi_deregister(void) | |
1734 | { | |
1735 | return misc_deregister(&vhost_scsi_misc); | |
1736 | } | |
1737 | ||
1a1ff825 | 1738 | static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport) |
057cbf49 NB |
1739 | { |
1740 | switch (tport->tport_proto_id) { | |
1741 | case SCSI_PROTOCOL_SAS: | |
1742 | return "SAS"; | |
1743 | case SCSI_PROTOCOL_FCP: | |
1744 | return "FCP"; | |
1745 | case SCSI_PROTOCOL_ISCSI: | |
1746 | return "iSCSI"; | |
1747 | default: | |
1748 | break; | |
1749 | } | |
1750 | ||
1751 | return "Unknown"; | |
1752 | } | |
1753 | ||
683bd967 | 1754 | static void |
1a1ff825 | 1755 | vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg, |
683bd967 | 1756 | struct se_lun *lun, bool plug) |
a6c9af87 AH |
1757 | { |
1758 | ||
1759 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1760 | struct vhost_virtqueue *vq; | |
1761 | u32 reason; | |
1762 | ||
1763 | if (!vs) | |
1764 | return; | |
1765 | ||
1766 | mutex_lock(&vs->dev.mutex); | |
a6c9af87 AH |
1767 | |
1768 | if (plug) | |
1769 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1770 | else | |
1771 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1772 | ||
3ab2e420 | 1773 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 | 1774 | mutex_lock(&vq->mutex); |
ea16c514 | 1775 | if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG)) |
1a1ff825 | 1776 | vhost_scsi_send_evt(vs, tpg, lun, |
ea16c514 | 1777 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); |
a6c9af87 AH |
1778 | mutex_unlock(&vq->mutex); |
1779 | mutex_unlock(&vs->dev.mutex); | |
1780 | } | |
1781 | ||
1a1ff825 | 1782 | static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1783 | { |
1a1ff825 | 1784 | vhost_scsi_do_plug(tpg, lun, true); |
a6c9af87 AH |
1785 | } |
1786 | ||
1a1ff825 | 1787 | static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1788 | { |
1a1ff825 | 1789 | vhost_scsi_do_plug(tpg, lun, false); |
a6c9af87 AH |
1790 | } |
1791 | ||
1a1ff825 | 1792 | static int vhost_scsi_port_link(struct se_portal_group *se_tpg, |
683bd967 | 1793 | struct se_lun *lun) |
057cbf49 | 1794 | { |
1a1ff825 NB |
1795 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1796 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1797 | |
1a1ff825 | 1798 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1799 | |
98718312 AH |
1800 | mutex_lock(&tpg->tv_tpg_mutex); |
1801 | tpg->tv_tpg_port_count++; | |
1802 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 | 1803 | |
1a1ff825 | 1804 | vhost_scsi_hotplug(tpg, lun); |
a6c9af87 | 1805 | |
1a1ff825 | 1806 | mutex_unlock(&vhost_scsi_mutex); |
a6c9af87 | 1807 | |
057cbf49 NB |
1808 | return 0; |
1809 | } | |
1810 | ||
1a1ff825 | 1811 | static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg, |
683bd967 | 1812 | struct se_lun *lun) |
057cbf49 | 1813 | { |
1a1ff825 NB |
1814 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1815 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1816 | |
1a1ff825 | 1817 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1818 | |
98718312 AH |
1819 | mutex_lock(&tpg->tv_tpg_mutex); |
1820 | tpg->tv_tpg_port_count--; | |
1821 | mutex_unlock(&tpg->tv_tpg_mutex); | |
a6c9af87 | 1822 | |
1a1ff825 | 1823 | vhost_scsi_hotunplug(tpg, lun); |
a6c9af87 | 1824 | |
1a1ff825 | 1825 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 NB |
1826 | } |
1827 | ||
683bd967 | 1828 | static struct se_node_acl * |
1a1ff825 | 1829 | vhost_scsi_make_nodeacl(struct se_portal_group *se_tpg, |
683bd967 AH |
1830 | struct config_group *group, |
1831 | const char *name) | |
057cbf49 NB |
1832 | { |
1833 | struct se_node_acl *se_nacl, *se_nacl_new; | |
1a1ff825 | 1834 | struct vhost_scsi_nacl *nacl; |
057cbf49 NB |
1835 | u64 wwpn = 0; |
1836 | u32 nexus_depth; | |
1837 | ||
1a1ff825 | 1838 | /* vhost_scsi_parse_wwn(name, &wwpn, 1) < 0) |
057cbf49 | 1839 | return ERR_PTR(-EINVAL); */ |
1a1ff825 | 1840 | se_nacl_new = vhost_scsi_alloc_fabric_acl(se_tpg); |
057cbf49 NB |
1841 | if (!se_nacl_new) |
1842 | return ERR_PTR(-ENOMEM); | |
1843 | ||
1844 | nexus_depth = 1; | |
1845 | /* | |
1846 | * se_nacl_new may be released by core_tpg_add_initiator_node_acl() | |
1847 | * when converting a NodeACL from demo mode -> explict | |
1848 | */ | |
1849 | se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new, | |
1850 | name, nexus_depth); | |
1851 | if (IS_ERR(se_nacl)) { | |
1a1ff825 | 1852 | vhost_scsi_release_fabric_acl(se_tpg, se_nacl_new); |
057cbf49 NB |
1853 | return se_nacl; |
1854 | } | |
1855 | /* | |
1a1ff825 | 1856 | * Locate our struct vhost_scsi_nacl and set the FC Nport WWPN |
057cbf49 | 1857 | */ |
1a1ff825 | 1858 | nacl = container_of(se_nacl, struct vhost_scsi_nacl, se_node_acl); |
057cbf49 NB |
1859 | nacl->iport_wwpn = wwpn; |
1860 | ||
1861 | return se_nacl; | |
1862 | } | |
1863 | ||
1a1ff825 | 1864 | static void vhost_scsi_drop_nodeacl(struct se_node_acl *se_acl) |
057cbf49 | 1865 | { |
1a1ff825 NB |
1866 | struct vhost_scsi_nacl *nacl = container_of(se_acl, |
1867 | struct vhost_scsi_nacl, se_node_acl); | |
057cbf49 NB |
1868 | core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1); |
1869 | kfree(nacl); | |
1870 | } | |
1871 | ||
1a1ff825 | 1872 | static void vhost_scsi_free_cmd_map_res(struct vhost_scsi_nexus *nexus, |
3aee26b4 NB |
1873 | struct se_session *se_sess) |
1874 | { | |
1a1ff825 | 1875 | struct vhost_scsi_cmd *tv_cmd; |
3aee26b4 NB |
1876 | unsigned int i; |
1877 | ||
1878 | if (!se_sess->sess_cmd_map) | |
1879 | return; | |
1880 | ||
1a1ff825 NB |
1881 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1882 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 NB |
1883 | |
1884 | kfree(tv_cmd->tvc_sgl); | |
b1935f68 | 1885 | kfree(tv_cmd->tvc_prot_sgl); |
3aee26b4 NB |
1886 | kfree(tv_cmd->tvc_upages); |
1887 | } | |
1888 | } | |
1889 | ||
b1d75fe5 NB |
1890 | static ssize_t vhost_scsi_tpg_attrib_store_fabric_prot_type( |
1891 | struct se_portal_group *se_tpg, | |
1892 | const char *page, | |
1893 | size_t count) | |
1894 | { | |
1895 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, | |
1896 | struct vhost_scsi_tpg, se_tpg); | |
1897 | unsigned long val; | |
1898 | int ret = kstrtoul(page, 0, &val); | |
1899 | ||
1900 | if (ret) { | |
1901 | pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); | |
1902 | return ret; | |
1903 | } | |
1904 | if (val != 0 && val != 1 && val != 3) { | |
1905 | pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val); | |
1906 | return -EINVAL; | |
1907 | } | |
1908 | tpg->tv_fabric_prot_type = val; | |
1909 | ||
1910 | return count; | |
1911 | } | |
1912 | ||
1913 | static ssize_t vhost_scsi_tpg_attrib_show_fabric_prot_type( | |
1914 | struct se_portal_group *se_tpg, | |
1915 | char *page) | |
1916 | { | |
1917 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, | |
1918 | struct vhost_scsi_tpg, se_tpg); | |
1919 | ||
1920 | return sprintf(page, "%d\n", tpg->tv_fabric_prot_type); | |
1921 | } | |
1922 | TF_TPG_ATTRIB_ATTR(vhost_scsi, fabric_prot_type, S_IRUGO | S_IWUSR); | |
1923 | ||
1924 | static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = { | |
1925 | &vhost_scsi_tpg_attrib_fabric_prot_type.attr, | |
1926 | NULL, | |
1927 | }; | |
1928 | ||
1a1ff825 | 1929 | static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg, |
683bd967 | 1930 | const char *name) |
057cbf49 NB |
1931 | { |
1932 | struct se_portal_group *se_tpg; | |
3aee26b4 | 1933 | struct se_session *se_sess; |
1a1ff825 NB |
1934 | struct vhost_scsi_nexus *tv_nexus; |
1935 | struct vhost_scsi_cmd *tv_cmd; | |
3aee26b4 | 1936 | unsigned int i; |
057cbf49 | 1937 | |
98718312 AH |
1938 | mutex_lock(&tpg->tv_tpg_mutex); |
1939 | if (tpg->tpg_nexus) { | |
1940 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1941 | pr_debug("tpg->tpg_nexus already exists\n"); | |
057cbf49 NB |
1942 | return -EEXIST; |
1943 | } | |
98718312 | 1944 | se_tpg = &tpg->se_tpg; |
057cbf49 | 1945 | |
1a1ff825 | 1946 | tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL); |
057cbf49 | 1947 | if (!tv_nexus) { |
98718312 | 1948 | mutex_unlock(&tpg->tv_tpg_mutex); |
1a1ff825 | 1949 | pr_err("Unable to allocate struct vhost_scsi_nexus\n"); |
057cbf49 NB |
1950 | return -ENOMEM; |
1951 | } | |
1952 | /* | |
4824d3bf | 1953 | * Initialize the struct se_session pointer and setup tagpool |
1a1ff825 | 1954 | * for struct vhost_scsi_cmd descriptors |
057cbf49 | 1955 | */ |
4824d3bf | 1956 | tv_nexus->tvn_se_sess = transport_init_session_tags( |
1a1ff825 NB |
1957 | VHOST_SCSI_DEFAULT_TAGS, |
1958 | sizeof(struct vhost_scsi_cmd), | |
95e7c434 | 1959 | TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS); |
057cbf49 | 1960 | if (IS_ERR(tv_nexus->tvn_se_sess)) { |
98718312 | 1961 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1962 | kfree(tv_nexus); |
1963 | return -ENOMEM; | |
1964 | } | |
3aee26b4 | 1965 | se_sess = tv_nexus->tvn_se_sess; |
1a1ff825 NB |
1966 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1967 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 NB |
1968 | |
1969 | tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) * | |
1a1ff825 | 1970 | VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL); |
3aee26b4 NB |
1971 | if (!tv_cmd->tvc_sgl) { |
1972 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1973 | pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); | |
1974 | goto out; | |
1975 | } | |
1976 | ||
1977 | tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) * | |
1a1ff825 | 1978 | VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL); |
3aee26b4 NB |
1979 | if (!tv_cmd->tvc_upages) { |
1980 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1981 | pr_err("Unable to allocate tv_cmd->tvc_upages\n"); | |
1982 | goto out; | |
1983 | } | |
b1935f68 NB |
1984 | |
1985 | tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) * | |
1a1ff825 | 1986 | VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL); |
b1935f68 NB |
1987 | if (!tv_cmd->tvc_prot_sgl) { |
1988 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1989 | pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); | |
1990 | goto out; | |
1991 | } | |
3aee26b4 | 1992 | } |
057cbf49 NB |
1993 | /* |
1994 | * Since we are running in 'demo mode' this call with generate a | |
1a1ff825 | 1995 | * struct se_node_acl for the vhost_scsi struct se_portal_group with |
057cbf49 NB |
1996 | * the SCSI Initiator port name of the passed configfs group 'name'. |
1997 | */ | |
1998 | tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
1999 | se_tpg, (unsigned char *)name); | |
2000 | if (!tv_nexus->tvn_se_sess->se_node_acl) { | |
98718312 | 2001 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2002 | pr_debug("core_tpg_check_initiator_node_acl() failed" |
2003 | " for %s\n", name); | |
3aee26b4 | 2004 | goto out; |
057cbf49 NB |
2005 | } |
2006 | /* | |
2f450cc1 | 2007 | * Now register the TCM vhost virtual I_T Nexus as active. |
057cbf49 | 2008 | */ |
2f450cc1 | 2009 | transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl, |
057cbf49 | 2010 | tv_nexus->tvn_se_sess, tv_nexus); |
98718312 | 2011 | tpg->tpg_nexus = tv_nexus; |
057cbf49 | 2012 | |
98718312 | 2013 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 2014 | return 0; |
3aee26b4 NB |
2015 | |
2016 | out: | |
1a1ff825 | 2017 | vhost_scsi_free_cmd_map_res(tv_nexus, se_sess); |
3aee26b4 NB |
2018 | transport_free_session(se_sess); |
2019 | kfree(tv_nexus); | |
2020 | return -ENOMEM; | |
057cbf49 NB |
2021 | } |
2022 | ||
1a1ff825 | 2023 | static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg) |
057cbf49 NB |
2024 | { |
2025 | struct se_session *se_sess; | |
1a1ff825 | 2026 | struct vhost_scsi_nexus *tv_nexus; |
057cbf49 NB |
2027 | |
2028 | mutex_lock(&tpg->tv_tpg_mutex); | |
2029 | tv_nexus = tpg->tpg_nexus; | |
2030 | if (!tv_nexus) { | |
2031 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2032 | return -ENODEV; | |
2033 | } | |
2034 | ||
2035 | se_sess = tv_nexus->tvn_se_sess; | |
2036 | if (!se_sess) { | |
2037 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2038 | return -ENODEV; | |
2039 | } | |
2040 | ||
101998f6 | 2041 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 2042 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 2043 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 2044 | " active TPG port count: %d\n", |
101998f6 NB |
2045 | tpg->tv_tpg_port_count); |
2046 | return -EBUSY; | |
057cbf49 NB |
2047 | } |
2048 | ||
101998f6 | 2049 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 2050 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 2051 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 2052 | " active TPG vhost count: %d\n", |
101998f6 NB |
2053 | tpg->tv_tpg_vhost_count); |
2054 | return -EBUSY; | |
057cbf49 NB |
2055 | } |
2056 | ||
101998f6 | 2057 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
1a1ff825 | 2058 | " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport), |
057cbf49 | 2059 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
3aee26b4 | 2060 | |
1a1ff825 | 2061 | vhost_scsi_free_cmd_map_res(tv_nexus, se_sess); |
057cbf49 | 2062 | /* |
101998f6 | 2063 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 NB |
2064 | */ |
2065 | transport_deregister_session(tv_nexus->tvn_se_sess); | |
2066 | tpg->tpg_nexus = NULL; | |
2067 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2068 | ||
2069 | kfree(tv_nexus); | |
2070 | return 0; | |
2071 | } | |
2072 | ||
1a1ff825 | 2073 | static ssize_t vhost_scsi_tpg_show_nexus(struct se_portal_group *se_tpg, |
683bd967 | 2074 | char *page) |
057cbf49 | 2075 | { |
1a1ff825 NB |
2076 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2077 | struct vhost_scsi_tpg, se_tpg); | |
2078 | struct vhost_scsi_nexus *tv_nexus; | |
057cbf49 NB |
2079 | ssize_t ret; |
2080 | ||
98718312 AH |
2081 | mutex_lock(&tpg->tv_tpg_mutex); |
2082 | tv_nexus = tpg->tpg_nexus; | |
057cbf49 | 2083 | if (!tv_nexus) { |
98718312 | 2084 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2085 | return -ENODEV; |
2086 | } | |
2087 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
2088 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
98718312 | 2089 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2090 | |
2091 | return ret; | |
2092 | } | |
2093 | ||
1a1ff825 | 2094 | static ssize_t vhost_scsi_tpg_store_nexus(struct se_portal_group *se_tpg, |
683bd967 AH |
2095 | const char *page, |
2096 | size_t count) | |
057cbf49 | 2097 | { |
1a1ff825 NB |
2098 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2099 | struct vhost_scsi_tpg, se_tpg); | |
2100 | struct vhost_scsi_tport *tport_wwn = tpg->tport; | |
2101 | unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr; | |
057cbf49 NB |
2102 | int ret; |
2103 | /* | |
2104 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
2105 | */ | |
2106 | if (!strncmp(page, "NULL", 4)) { | |
1a1ff825 | 2107 | ret = vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
2108 | return (!ret) ? count : ret; |
2109 | } | |
2110 | /* | |
2111 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1a1ff825 NB |
2112 | * the fabric protocol_id set in vhost_scsi_make_tport(), and call |
2113 | * vhost_scsi_make_nexus(). | |
057cbf49 | 2114 | */ |
1a1ff825 | 2115 | if (strlen(page) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2116 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
1a1ff825 | 2117 | " max: %d\n", page, VHOST_SCSI_NAMELEN); |
057cbf49 NB |
2118 | return -EINVAL; |
2119 | } | |
1a1ff825 | 2120 | snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page); |
057cbf49 NB |
2121 | |
2122 | ptr = strstr(i_port, "naa."); | |
2123 | if (ptr) { | |
2124 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
2125 | pr_err("Passed SAS Initiator Port %s does not" | |
2126 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2127 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2128 | return -EINVAL; |
2129 | } | |
2130 | port_ptr = &i_port[0]; | |
2131 | goto check_newline; | |
2132 | } | |
2133 | ptr = strstr(i_port, "fc."); | |
2134 | if (ptr) { | |
2135 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
2136 | pr_err("Passed FCP Initiator Port %s does not" | |
2137 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2138 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2139 | return -EINVAL; |
2140 | } | |
2141 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
2142 | goto check_newline; | |
2143 | } | |
2144 | ptr = strstr(i_port, "iqn."); | |
2145 | if (ptr) { | |
2146 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
2147 | pr_err("Passed iSCSI Initiator Port %s does not" | |
2148 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2149 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2150 | return -EINVAL; |
2151 | } | |
2152 | port_ptr = &i_port[0]; | |
2153 | goto check_newline; | |
2154 | } | |
2155 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
2156 | " %s\n", i_port); | |
2157 | return -EINVAL; | |
2158 | /* | |
2159 | * Clear any trailing newline for the NAA WWN | |
2160 | */ | |
2161 | check_newline: | |
2162 | if (i_port[strlen(i_port)-1] == '\n') | |
2163 | i_port[strlen(i_port)-1] = '\0'; | |
2164 | ||
1a1ff825 | 2165 | ret = vhost_scsi_make_nexus(tpg, port_ptr); |
057cbf49 NB |
2166 | if (ret < 0) |
2167 | return ret; | |
2168 | ||
2169 | return count; | |
2170 | } | |
2171 | ||
1a1ff825 | 2172 | TF_TPG_BASE_ATTR(vhost_scsi, nexus, S_IRUGO | S_IWUSR); |
057cbf49 | 2173 | |
1a1ff825 NB |
2174 | static struct configfs_attribute *vhost_scsi_tpg_attrs[] = { |
2175 | &vhost_scsi_tpg_nexus.attr, | |
057cbf49 NB |
2176 | NULL, |
2177 | }; | |
2178 | ||
683bd967 | 2179 | static struct se_portal_group * |
1a1ff825 | 2180 | vhost_scsi_make_tpg(struct se_wwn *wwn, |
683bd967 AH |
2181 | struct config_group *group, |
2182 | const char *name) | |
057cbf49 | 2183 | { |
1a1ff825 NB |
2184 | struct vhost_scsi_tport *tport = container_of(wwn, |
2185 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 | 2186 | |
1a1ff825 | 2187 | struct vhost_scsi_tpg *tpg; |
59c816c1 | 2188 | u16 tpgt; |
057cbf49 NB |
2189 | int ret; |
2190 | ||
2191 | if (strstr(name, "tpgt_") != name) | |
2192 | return ERR_PTR(-EINVAL); | |
59c816c1 | 2193 | if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET) |
057cbf49 NB |
2194 | return ERR_PTR(-EINVAL); |
2195 | ||
1a1ff825 | 2196 | tpg = kzalloc(sizeof(struct vhost_scsi_tpg), GFP_KERNEL); |
057cbf49 | 2197 | if (!tpg) { |
1a1ff825 | 2198 | pr_err("Unable to allocate struct vhost_scsi_tpg"); |
057cbf49 NB |
2199 | return ERR_PTR(-ENOMEM); |
2200 | } | |
2201 | mutex_init(&tpg->tv_tpg_mutex); | |
2202 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
2203 | tpg->tport = tport; | |
2204 | tpg->tport_tpgt = tpgt; | |
2205 | ||
9ac8928e | 2206 | ret = core_tpg_register(&vhost_scsi_ops, wwn, |
057cbf49 NB |
2207 | &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL); |
2208 | if (ret < 0) { | |
2209 | kfree(tpg); | |
2210 | return NULL; | |
2211 | } | |
1a1ff825 NB |
2212 | mutex_lock(&vhost_scsi_mutex); |
2213 | list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list); | |
2214 | mutex_unlock(&vhost_scsi_mutex); | |
057cbf49 NB |
2215 | |
2216 | return &tpg->se_tpg; | |
2217 | } | |
2218 | ||
1a1ff825 | 2219 | static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg) |
057cbf49 | 2220 | { |
1a1ff825 NB |
2221 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2222 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 2223 | |
1a1ff825 | 2224 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 2225 | list_del(&tpg->tv_tpg_list); |
1a1ff825 | 2226 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 2227 | /* |
101998f6 | 2228 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 | 2229 | */ |
1a1ff825 | 2230 | vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
2231 | /* |
2232 | * Deregister the se_tpg from TCM.. | |
2233 | */ | |
2234 | core_tpg_deregister(se_tpg); | |
2235 | kfree(tpg); | |
2236 | } | |
2237 | ||
683bd967 | 2238 | static struct se_wwn * |
1a1ff825 | 2239 | vhost_scsi_make_tport(struct target_fabric_configfs *tf, |
683bd967 AH |
2240 | struct config_group *group, |
2241 | const char *name) | |
057cbf49 | 2242 | { |
1a1ff825 | 2243 | struct vhost_scsi_tport *tport; |
057cbf49 NB |
2244 | char *ptr; |
2245 | u64 wwpn = 0; | |
2246 | int off = 0; | |
2247 | ||
1a1ff825 | 2248 | /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0) |
057cbf49 NB |
2249 | return ERR_PTR(-EINVAL); */ |
2250 | ||
1a1ff825 | 2251 | tport = kzalloc(sizeof(struct vhost_scsi_tport), GFP_KERNEL); |
057cbf49 | 2252 | if (!tport) { |
1a1ff825 | 2253 | pr_err("Unable to allocate struct vhost_scsi_tport"); |
057cbf49 NB |
2254 | return ERR_PTR(-ENOMEM); |
2255 | } | |
2256 | tport->tport_wwpn = wwpn; | |
2257 | /* | |
2258 | * Determine the emulated Protocol Identifier and Target Port Name | |
2259 | * based on the incoming configfs directory name. | |
2260 | */ | |
2261 | ptr = strstr(name, "naa."); | |
2262 | if (ptr) { | |
2263 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
2264 | goto check_len; | |
2265 | } | |
2266 | ptr = strstr(name, "fc."); | |
2267 | if (ptr) { | |
2268 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
2269 | off = 3; /* Skip over "fc." */ | |
2270 | goto check_len; | |
2271 | } | |
2272 | ptr = strstr(name, "iqn."); | |
2273 | if (ptr) { | |
2274 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
2275 | goto check_len; | |
2276 | } | |
2277 | ||
2278 | pr_err("Unable to locate prefix for emulated Target Port:" | |
2279 | " %s\n", name); | |
2280 | kfree(tport); | |
2281 | return ERR_PTR(-EINVAL); | |
2282 | ||
2283 | check_len: | |
1a1ff825 | 2284 | if (strlen(name) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2285 | pr_err("Emulated %s Address: %s, exceeds" |
1a1ff825 NB |
2286 | " max: %d\n", name, vhost_scsi_dump_proto_id(tport), |
2287 | VHOST_SCSI_NAMELEN); | |
057cbf49 NB |
2288 | kfree(tport); |
2289 | return ERR_PTR(-EINVAL); | |
2290 | } | |
1a1ff825 | 2291 | snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]); |
057cbf49 NB |
2292 | |
2293 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
1a1ff825 | 2294 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name); |
057cbf49 NB |
2295 | |
2296 | return &tport->tport_wwn; | |
2297 | } | |
2298 | ||
1a1ff825 | 2299 | static void vhost_scsi_drop_tport(struct se_wwn *wwn) |
057cbf49 | 2300 | { |
1a1ff825 NB |
2301 | struct vhost_scsi_tport *tport = container_of(wwn, |
2302 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 NB |
2303 | |
2304 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
1a1ff825 | 2305 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), |
057cbf49 NB |
2306 | tport->tport_name); |
2307 | ||
2308 | kfree(tport); | |
2309 | } | |
2310 | ||
683bd967 | 2311 | static ssize_t |
1a1ff825 | 2312 | vhost_scsi_wwn_show_attr_version(struct target_fabric_configfs *tf, |
683bd967 | 2313 | char *page) |
057cbf49 NB |
2314 | { |
2315 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" | |
1a1ff825 | 2316 | "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 NB |
2317 | utsname()->machine); |
2318 | } | |
2319 | ||
1a1ff825 | 2320 | TF_WWN_ATTR_RO(vhost_scsi, version); |
057cbf49 | 2321 | |
1a1ff825 NB |
2322 | static struct configfs_attribute *vhost_scsi_wwn_attrs[] = { |
2323 | &vhost_scsi_wwn_version.attr, | |
057cbf49 NB |
2324 | NULL, |
2325 | }; | |
2326 | ||
1a1ff825 | 2327 | static struct target_core_fabric_ops vhost_scsi_ops = { |
9ac8928e CH |
2328 | .module = THIS_MODULE, |
2329 | .name = "vhost", | |
1a1ff825 NB |
2330 | .get_fabric_name = vhost_scsi_get_fabric_name, |
2331 | .get_fabric_proto_ident = vhost_scsi_get_fabric_proto_ident, | |
2332 | .tpg_get_wwn = vhost_scsi_get_fabric_wwn, | |
2333 | .tpg_get_tag = vhost_scsi_get_tpgt, | |
2334 | .tpg_get_default_depth = vhost_scsi_get_default_depth, | |
2335 | .tpg_get_pr_transport_id = vhost_scsi_get_pr_transport_id, | |
2336 | .tpg_get_pr_transport_id_len = vhost_scsi_get_pr_transport_id_len, | |
2337 | .tpg_parse_pr_out_transport_id = vhost_scsi_parse_pr_out_transport_id, | |
2338 | .tpg_check_demo_mode = vhost_scsi_check_true, | |
2339 | .tpg_check_demo_mode_cache = vhost_scsi_check_true, | |
2340 | .tpg_check_demo_mode_write_protect = vhost_scsi_check_false, | |
2341 | .tpg_check_prod_mode_write_protect = vhost_scsi_check_false, | |
b1d75fe5 | 2342 | .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only, |
1a1ff825 NB |
2343 | .tpg_alloc_fabric_acl = vhost_scsi_alloc_fabric_acl, |
2344 | .tpg_release_fabric_acl = vhost_scsi_release_fabric_acl, | |
2345 | .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index, | |
2346 | .release_cmd = vhost_scsi_release_cmd, | |
084ed45b | 2347 | .check_stop_free = vhost_scsi_check_stop_free, |
1a1ff825 NB |
2348 | .shutdown_session = vhost_scsi_shutdown_session, |
2349 | .close_session = vhost_scsi_close_session, | |
2350 | .sess_get_index = vhost_scsi_sess_get_index, | |
057cbf49 | 2351 | .sess_get_initiator_sid = NULL, |
1a1ff825 NB |
2352 | .write_pending = vhost_scsi_write_pending, |
2353 | .write_pending_status = vhost_scsi_write_pending_status, | |
2354 | .set_default_node_attributes = vhost_scsi_set_default_node_attrs, | |
2355 | .get_task_tag = vhost_scsi_get_task_tag, | |
2356 | .get_cmd_state = vhost_scsi_get_cmd_state, | |
2357 | .queue_data_in = vhost_scsi_queue_data_in, | |
2358 | .queue_status = vhost_scsi_queue_status, | |
2359 | .queue_tm_rsp = vhost_scsi_queue_tm_rsp, | |
2360 | .aborted_task = vhost_scsi_aborted_task, | |
057cbf49 NB |
2361 | /* |
2362 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
2363 | */ | |
1a1ff825 NB |
2364 | .fabric_make_wwn = vhost_scsi_make_tport, |
2365 | .fabric_drop_wwn = vhost_scsi_drop_tport, | |
2366 | .fabric_make_tpg = vhost_scsi_make_tpg, | |
2367 | .fabric_drop_tpg = vhost_scsi_drop_tpg, | |
2368 | .fabric_post_link = vhost_scsi_port_link, | |
2369 | .fabric_pre_unlink = vhost_scsi_port_unlink, | |
057cbf49 NB |
2370 | .fabric_make_np = NULL, |
2371 | .fabric_drop_np = NULL, | |
1a1ff825 NB |
2372 | .fabric_make_nodeacl = vhost_scsi_make_nodeacl, |
2373 | .fabric_drop_nodeacl = vhost_scsi_drop_nodeacl, | |
9ac8928e CH |
2374 | |
2375 | .tfc_wwn_attrs = vhost_scsi_wwn_attrs, | |
2376 | .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs, | |
2377 | .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs, | |
057cbf49 NB |
2378 | }; |
2379 | ||
9ac8928e | 2380 | static int __init vhost_scsi_init(void) |
057cbf49 | 2381 | { |
9ac8928e | 2382 | int ret = -ENOMEM; |
057cbf49 | 2383 | |
9ac8928e | 2384 | pr_debug("TCM_VHOST fabric module %s on %s/%s" |
1a1ff825 | 2385 | " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 | 2386 | utsname()->machine); |
057cbf49 | 2387 | |
101998f6 NB |
2388 | /* |
2389 | * Use our own dedicated workqueue for submitting I/O into | |
2390 | * target core to avoid contention within system_wq. | |
2391 | */ | |
1a1ff825 NB |
2392 | vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0); |
2393 | if (!vhost_scsi_workqueue) | |
057cbf49 NB |
2394 | goto out; |
2395 | ||
2396 | ret = vhost_scsi_register(); | |
2397 | if (ret < 0) | |
2398 | goto out_destroy_workqueue; | |
2399 | ||
9ac8928e | 2400 | ret = target_register_template(&vhost_scsi_ops); |
057cbf49 NB |
2401 | if (ret < 0) |
2402 | goto out_vhost_scsi_deregister; | |
2403 | ||
2404 | return 0; | |
2405 | ||
2406 | out_vhost_scsi_deregister: | |
2407 | vhost_scsi_deregister(); | |
2408 | out_destroy_workqueue: | |
1a1ff825 | 2409 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2410 | out: |
2411 | return ret; | |
2412 | }; | |
2413 | ||
1a1ff825 | 2414 | static void vhost_scsi_exit(void) |
057cbf49 | 2415 | { |
9ac8928e | 2416 | target_unregister_template(&vhost_scsi_ops); |
057cbf49 | 2417 | vhost_scsi_deregister(); |
1a1ff825 | 2418 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2419 | }; |
2420 | ||
181c04a3 MT |
2421 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
2422 | MODULE_ALIAS("tcm_vhost"); | |
057cbf49 | 2423 | MODULE_LICENSE("GPL"); |
1a1ff825 NB |
2424 | module_init(vhost_scsi_init); |
2425 | module_exit(vhost_scsi_exit); |