Commit | Line | Data |
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057cbf49 NB |
1 | /******************************************************************************* |
2 | * Vhost kernel TCM fabric driver for virtio SCSI initiators | |
3 | * | |
4c76251e | 4 | * (C) Copyright 2010-2013 Datera, Inc. |
057cbf49 NB |
5 | * (C) Copyright 2010-2012 IBM Corp. |
6 | * | |
7 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. | |
8 | * | |
4c76251e | 9 | * Authors: Nicholas A. Bellinger <nab@daterainc.com> |
057cbf49 NB |
10 | * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | ****************************************************************************/ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/moduleparam.h> | |
26 | #include <generated/utsrelease.h> | |
27 | #include <linux/utsname.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/kthread.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/configfs.h> | |
34 | #include <linux/ctype.h> | |
35 | #include <linux/compat.h> | |
36 | #include <linux/eventfd.h> | |
057cbf49 NB |
37 | #include <linux/fs.h> |
38 | #include <linux/miscdevice.h> | |
39 | #include <asm/unaligned.h> | |
40 | #include <scsi/scsi.h> | |
057cbf49 NB |
41 | #include <target/target_core_base.h> |
42 | #include <target/target_core_fabric.h> | |
43 | #include <target/target_core_fabric_configfs.h> | |
44 | #include <target/target_core_configfs.h> | |
45 | #include <target/configfs_macros.h> | |
46 | #include <linux/vhost.h> | |
057cbf49 | 47 | #include <linux/virtio_scsi.h> |
9d6064a3 | 48 | #include <linux/llist.h> |
1b7f390e | 49 | #include <linux/bitmap.h> |
4824d3bf | 50 | #include <linux/percpu_ida.h> |
057cbf49 | 51 | |
057cbf49 | 52 | #include "vhost.h" |
5012a3a3 | 53 | |
1a1ff825 NB |
54 | #define VHOST_SCSI_VERSION "v0.1" |
55 | #define VHOST_SCSI_NAMELEN 256 | |
56 | #define VHOST_SCSI_MAX_CDB_SIZE 32 | |
57 | #define VHOST_SCSI_DEFAULT_TAGS 256 | |
58 | #define VHOST_SCSI_PREALLOC_SGLS 2048 | |
59 | #define VHOST_SCSI_PREALLOC_UPAGES 2048 | |
60 | #define VHOST_SCSI_PREALLOC_PROT_SGLS 512 | |
5012a3a3 MT |
61 | |
62 | struct vhost_scsi_inflight { | |
63 | /* Wait for the flush operation to finish */ | |
64 | struct completion comp; | |
65 | /* Refcount for the inflight reqs */ | |
66 | struct kref kref; | |
67 | }; | |
68 | ||
1a1ff825 | 69 | struct vhost_scsi_cmd { |
5012a3a3 MT |
70 | /* Descriptor from vhost_get_vq_desc() for virt_queue segment */ |
71 | int tvc_vq_desc; | |
72 | /* virtio-scsi initiator task attribute */ | |
73 | int tvc_task_attr; | |
79c14141 NB |
74 | /* virtio-scsi response incoming iovecs */ |
75 | int tvc_in_iovs; | |
5012a3a3 MT |
76 | /* virtio-scsi initiator data direction */ |
77 | enum dma_data_direction tvc_data_direction; | |
78 | /* Expected data transfer length from virtio-scsi header */ | |
79 | u32 tvc_exp_data_len; | |
80 | /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */ | |
81 | u64 tvc_tag; | |
82 | /* The number of scatterlists associated with this cmd */ | |
83 | u32 tvc_sgl_count; | |
e31885dd | 84 | u32 tvc_prot_sgl_count; |
1a1ff825 | 85 | /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */ |
5012a3a3 MT |
86 | u32 tvc_lun; |
87 | /* Pointer to the SGL formatted memory from virtio-scsi */ | |
88 | struct scatterlist *tvc_sgl; | |
b1935f68 | 89 | struct scatterlist *tvc_prot_sgl; |
3aee26b4 | 90 | struct page **tvc_upages; |
79c14141 NB |
91 | /* Pointer to response header iovec */ |
92 | struct iovec *tvc_resp_iov; | |
5012a3a3 MT |
93 | /* Pointer to vhost_scsi for our device */ |
94 | struct vhost_scsi *tvc_vhost; | |
95 | /* Pointer to vhost_virtqueue for the cmd */ | |
96 | struct vhost_virtqueue *tvc_vq; | |
97 | /* Pointer to vhost nexus memory */ | |
1a1ff825 | 98 | struct vhost_scsi_nexus *tvc_nexus; |
5012a3a3 MT |
99 | /* The TCM I/O descriptor that is accessed via container_of() */ |
100 | struct se_cmd tvc_se_cmd; | |
1a1ff825 | 101 | /* work item used for cmwq dispatch to vhost_scsi_submission_work() */ |
5012a3a3 MT |
102 | struct work_struct work; |
103 | /* Copy of the incoming SCSI command descriptor block (CDB) */ | |
1a1ff825 | 104 | unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE]; |
5012a3a3 MT |
105 | /* Sense buffer that will be mapped into outgoing status */ |
106 | unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER]; | |
107 | /* Completed commands list, serviced from vhost worker thread */ | |
108 | struct llist_node tvc_completion_list; | |
109 | /* Used to track inflight cmd */ | |
110 | struct vhost_scsi_inflight *inflight; | |
111 | }; | |
112 | ||
1a1ff825 | 113 | struct vhost_scsi_nexus { |
5012a3a3 MT |
114 | /* Pointer to TCM session for I_T Nexus */ |
115 | struct se_session *tvn_se_sess; | |
116 | }; | |
117 | ||
1a1ff825 | 118 | struct vhost_scsi_nacl { |
5012a3a3 MT |
119 | /* Binary World Wide unique Port Name for Vhost Initiator port */ |
120 | u64 iport_wwpn; | |
121 | /* ASCII formatted WWPN for Sas Initiator port */ | |
1a1ff825 NB |
122 | char iport_name[VHOST_SCSI_NAMELEN]; |
123 | /* Returned by vhost_scsi_make_nodeacl() */ | |
5012a3a3 MT |
124 | struct se_node_acl se_node_acl; |
125 | }; | |
126 | ||
1a1ff825 | 127 | struct vhost_scsi_tpg { |
5012a3a3 MT |
128 | /* Vhost port target portal group tag for TCM */ |
129 | u16 tport_tpgt; | |
130 | /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */ | |
131 | int tv_tpg_port_count; | |
132 | /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */ | |
133 | int tv_tpg_vhost_count; | |
b1d75fe5 NB |
134 | /* Used for enabling T10-PI with legacy devices */ |
135 | int tv_fabric_prot_type; | |
1a1ff825 | 136 | /* list for vhost_scsi_list */ |
5012a3a3 MT |
137 | struct list_head tv_tpg_list; |
138 | /* Used to protect access for tpg_nexus */ | |
139 | struct mutex tv_tpg_mutex; | |
140 | /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */ | |
1a1ff825 NB |
141 | struct vhost_scsi_nexus *tpg_nexus; |
142 | /* Pointer back to vhost_scsi_tport */ | |
143 | struct vhost_scsi_tport *tport; | |
144 | /* Returned by vhost_scsi_make_tpg() */ | |
5012a3a3 MT |
145 | struct se_portal_group se_tpg; |
146 | /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */ | |
147 | struct vhost_scsi *vhost_scsi; | |
148 | }; | |
149 | ||
1a1ff825 | 150 | struct vhost_scsi_tport { |
5012a3a3 MT |
151 | /* SCSI protocol the tport is providing */ |
152 | u8 tport_proto_id; | |
153 | /* Binary World Wide unique Port Name for Vhost Target port */ | |
154 | u64 tport_wwpn; | |
155 | /* ASCII formatted WWPN for Vhost Target port */ | |
1a1ff825 NB |
156 | char tport_name[VHOST_SCSI_NAMELEN]; |
157 | /* Returned by vhost_scsi_make_tport() */ | |
5012a3a3 MT |
158 | struct se_wwn tport_wwn; |
159 | }; | |
160 | ||
1a1ff825 | 161 | struct vhost_scsi_evt { |
5012a3a3 MT |
162 | /* event to be sent to guest */ |
163 | struct virtio_scsi_event event; | |
164 | /* event list, serviced from vhost worker thread */ | |
165 | struct llist_node list; | |
166 | }; | |
057cbf49 | 167 | |
101998f6 NB |
168 | enum { |
169 | VHOST_SCSI_VQ_CTL = 0, | |
170 | VHOST_SCSI_VQ_EVT = 1, | |
171 | VHOST_SCSI_VQ_IO = 2, | |
172 | }; | |
173 | ||
e72fd72e | 174 | /* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */ |
5dade710 | 175 | enum { |
95e7c434 | 176 | VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) | |
664ed90e NB |
177 | (1ULL << VIRTIO_SCSI_F_T10_PI) | |
178 | (1ULL << VIRTIO_F_ANY_LAYOUT) | | |
179 | (1ULL << VIRTIO_F_VERSION_1) | |
5dade710 NB |
180 | }; |
181 | ||
1b7f390e AH |
182 | #define VHOST_SCSI_MAX_TARGET 256 |
183 | #define VHOST_SCSI_MAX_VQ 128 | |
a6c9af87 | 184 | #define VHOST_SCSI_MAX_EVENT 128 |
67e18cf9 | 185 | |
3ab2e420 AH |
186 | struct vhost_scsi_virtqueue { |
187 | struct vhost_virtqueue vq; | |
3dfbff32 MT |
188 | /* |
189 | * Reference counting for inflight reqs, used for flush operation. At | |
190 | * each time, one reference tracks new commands submitted, while we | |
191 | * wait for another one to reach 0. | |
192 | */ | |
f2f0173d | 193 | struct vhost_scsi_inflight inflights[2]; |
3dfbff32 MT |
194 | /* |
195 | * Indicate current inflight in use, protected by vq->mutex. | |
196 | * Writers must also take dev mutex and flush under it. | |
197 | */ | |
f2f0173d | 198 | int inflight_idx; |
3ab2e420 AH |
199 | }; |
200 | ||
057cbf49 | 201 | struct vhost_scsi { |
67e18cf9 | 202 | /* Protected by vhost_scsi->dev.mutex */ |
1a1ff825 | 203 | struct vhost_scsi_tpg **vs_tpg; |
67e18cf9 | 204 | char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
67e18cf9 | 205 | |
057cbf49 | 206 | struct vhost_dev dev; |
3ab2e420 | 207 | struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ]; |
057cbf49 NB |
208 | |
209 | struct vhost_work vs_completion_work; /* cmd completion work item */ | |
9d6064a3 | 210 | struct llist_head vs_completion_list; /* cmd completion queue */ |
a6c9af87 AH |
211 | |
212 | struct vhost_work vs_event_work; /* evt injection work item */ | |
213 | struct llist_head vs_event_list; /* evt injection queue */ | |
214 | ||
215 | bool vs_events_missed; /* any missed events, protected by vq->mutex */ | |
216 | int vs_events_nr; /* num of pending events, protected by vq->mutex */ | |
057cbf49 NB |
217 | }; |
218 | ||
9ac8928e | 219 | static struct target_core_fabric_ops vhost_scsi_ops; |
1a1ff825 | 220 | static struct workqueue_struct *vhost_scsi_workqueue; |
057cbf49 | 221 | |
1a1ff825 NB |
222 | /* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */ |
223 | static DEFINE_MUTEX(vhost_scsi_mutex); | |
224 | static LIST_HEAD(vhost_scsi_list); | |
057cbf49 | 225 | |
b4078b5f | 226 | static int iov_num_pages(void __user *iov_base, size_t iov_len) |
765b34fd | 227 | { |
b4078b5f NB |
228 | return (PAGE_ALIGN((unsigned long)iov_base + iov_len) - |
229 | ((unsigned long)iov_base & PAGE_MASK)) >> PAGE_SHIFT; | |
765b34fd AH |
230 | } |
231 | ||
1a1ff825 | 232 | static void vhost_scsi_done_inflight(struct kref *kref) |
f2f0173d AH |
233 | { |
234 | struct vhost_scsi_inflight *inflight; | |
235 | ||
236 | inflight = container_of(kref, struct vhost_scsi_inflight, kref); | |
237 | complete(&inflight->comp); | |
238 | } | |
239 | ||
1a1ff825 | 240 | static void vhost_scsi_init_inflight(struct vhost_scsi *vs, |
f2f0173d AH |
241 | struct vhost_scsi_inflight *old_inflight[]) |
242 | { | |
243 | struct vhost_scsi_inflight *new_inflight; | |
244 | struct vhost_virtqueue *vq; | |
245 | int idx, i; | |
246 | ||
247 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
248 | vq = &vs->vqs[i].vq; | |
249 | ||
250 | mutex_lock(&vq->mutex); | |
251 | ||
252 | /* store old infight */ | |
253 | idx = vs->vqs[i].inflight_idx; | |
254 | if (old_inflight) | |
255 | old_inflight[i] = &vs->vqs[i].inflights[idx]; | |
256 | ||
257 | /* setup new infight */ | |
258 | vs->vqs[i].inflight_idx = idx ^ 1; | |
259 | new_inflight = &vs->vqs[i].inflights[idx ^ 1]; | |
260 | kref_init(&new_inflight->kref); | |
261 | init_completion(&new_inflight->comp); | |
262 | ||
263 | mutex_unlock(&vq->mutex); | |
264 | } | |
265 | } | |
266 | ||
267 | static struct vhost_scsi_inflight * | |
1a1ff825 | 268 | vhost_scsi_get_inflight(struct vhost_virtqueue *vq) |
f2f0173d AH |
269 | { |
270 | struct vhost_scsi_inflight *inflight; | |
271 | struct vhost_scsi_virtqueue *svq; | |
272 | ||
273 | svq = container_of(vq, struct vhost_scsi_virtqueue, vq); | |
274 | inflight = &svq->inflights[svq->inflight_idx]; | |
275 | kref_get(&inflight->kref); | |
276 | ||
277 | return inflight; | |
278 | } | |
279 | ||
1a1ff825 | 280 | static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight) |
f2f0173d | 281 | { |
1a1ff825 | 282 | kref_put(&inflight->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
283 | } |
284 | ||
1a1ff825 | 285 | static int vhost_scsi_check_true(struct se_portal_group *se_tpg) |
057cbf49 NB |
286 | { |
287 | return 1; | |
288 | } | |
289 | ||
1a1ff825 | 290 | static int vhost_scsi_check_false(struct se_portal_group *se_tpg) |
057cbf49 NB |
291 | { |
292 | return 0; | |
293 | } | |
294 | ||
1a1ff825 | 295 | static char *vhost_scsi_get_fabric_name(void) |
057cbf49 NB |
296 | { |
297 | return "vhost"; | |
298 | } | |
299 | ||
1a1ff825 | 300 | static u8 vhost_scsi_get_fabric_proto_ident(struct se_portal_group *se_tpg) |
057cbf49 | 301 | { |
1a1ff825 NB |
302 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
303 | struct vhost_scsi_tpg, se_tpg); | |
304 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
305 | |
306 | switch (tport->tport_proto_id) { | |
307 | case SCSI_PROTOCOL_SAS: | |
308 | return sas_get_fabric_proto_ident(se_tpg); | |
309 | case SCSI_PROTOCOL_FCP: | |
310 | return fc_get_fabric_proto_ident(se_tpg); | |
311 | case SCSI_PROTOCOL_ISCSI: | |
312 | return iscsi_get_fabric_proto_ident(se_tpg); | |
313 | default: | |
314 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
315 | " SAS emulation\n", tport->tport_proto_id); | |
316 | break; | |
317 | } | |
318 | ||
319 | return sas_get_fabric_proto_ident(se_tpg); | |
320 | } | |
321 | ||
1a1ff825 | 322 | static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg) |
057cbf49 | 323 | { |
1a1ff825 NB |
324 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
325 | struct vhost_scsi_tpg, se_tpg); | |
326 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
327 | |
328 | return &tport->tport_name[0]; | |
329 | } | |
330 | ||
1a1ff825 | 331 | static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg) |
057cbf49 | 332 | { |
1a1ff825 NB |
333 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
334 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 NB |
335 | return tpg->tport_tpgt; |
336 | } | |
337 | ||
1a1ff825 | 338 | static u32 vhost_scsi_get_default_depth(struct se_portal_group *se_tpg) |
057cbf49 NB |
339 | { |
340 | return 1; | |
341 | } | |
342 | ||
683bd967 | 343 | static u32 |
1a1ff825 | 344 | vhost_scsi_get_pr_transport_id(struct se_portal_group *se_tpg, |
683bd967 AH |
345 | struct se_node_acl *se_nacl, |
346 | struct t10_pr_registration *pr_reg, | |
347 | int *format_code, | |
348 | unsigned char *buf) | |
057cbf49 | 349 | { |
1a1ff825 NB |
350 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
351 | struct vhost_scsi_tpg, se_tpg); | |
352 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
353 | |
354 | switch (tport->tport_proto_id) { | |
355 | case SCSI_PROTOCOL_SAS: | |
356 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
357 | format_code, buf); | |
358 | case SCSI_PROTOCOL_FCP: | |
359 | return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
360 | format_code, buf); | |
361 | case SCSI_PROTOCOL_ISCSI: | |
362 | return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
363 | format_code, buf); | |
364 | default: | |
365 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
366 | " SAS emulation\n", tport->tport_proto_id); | |
367 | break; | |
368 | } | |
369 | ||
370 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
371 | format_code, buf); | |
372 | } | |
373 | ||
683bd967 | 374 | static u32 |
1a1ff825 | 375 | vhost_scsi_get_pr_transport_id_len(struct se_portal_group *se_tpg, |
683bd967 AH |
376 | struct se_node_acl *se_nacl, |
377 | struct t10_pr_registration *pr_reg, | |
378 | int *format_code) | |
057cbf49 | 379 | { |
1a1ff825 NB |
380 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
381 | struct vhost_scsi_tpg, se_tpg); | |
382 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
383 | |
384 | switch (tport->tport_proto_id) { | |
385 | case SCSI_PROTOCOL_SAS: | |
386 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
387 | format_code); | |
388 | case SCSI_PROTOCOL_FCP: | |
389 | return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
390 | format_code); | |
391 | case SCSI_PROTOCOL_ISCSI: | |
392 | return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
393 | format_code); | |
394 | default: | |
395 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
396 | " SAS emulation\n", tport->tport_proto_id); | |
397 | break; | |
398 | } | |
399 | ||
400 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
401 | format_code); | |
402 | } | |
403 | ||
683bd967 | 404 | static char * |
1a1ff825 | 405 | vhost_scsi_parse_pr_out_transport_id(struct se_portal_group *se_tpg, |
683bd967 AH |
406 | const char *buf, |
407 | u32 *out_tid_len, | |
408 | char **port_nexus_ptr) | |
057cbf49 | 409 | { |
1a1ff825 NB |
410 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
411 | struct vhost_scsi_tpg, se_tpg); | |
412 | struct vhost_scsi_tport *tport = tpg->tport; | |
057cbf49 NB |
413 | |
414 | switch (tport->tport_proto_id) { | |
415 | case SCSI_PROTOCOL_SAS: | |
416 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
417 | port_nexus_ptr); | |
418 | case SCSI_PROTOCOL_FCP: | |
419 | return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
420 | port_nexus_ptr); | |
421 | case SCSI_PROTOCOL_ISCSI: | |
422 | return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
423 | port_nexus_ptr); | |
424 | default: | |
425 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
426 | " SAS emulation\n", tport->tport_proto_id); | |
427 | break; | |
428 | } | |
429 | ||
430 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
431 | port_nexus_ptr); | |
432 | } | |
433 | ||
b1d75fe5 NB |
434 | static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg) |
435 | { | |
436 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, | |
437 | struct vhost_scsi_tpg, se_tpg); | |
438 | ||
439 | return tpg->tv_fabric_prot_type; | |
440 | } | |
441 | ||
683bd967 | 442 | static struct se_node_acl * |
1a1ff825 | 443 | vhost_scsi_alloc_fabric_acl(struct se_portal_group *se_tpg) |
057cbf49 | 444 | { |
1a1ff825 | 445 | struct vhost_scsi_nacl *nacl; |
057cbf49 | 446 | |
1a1ff825 | 447 | nacl = kzalloc(sizeof(struct vhost_scsi_nacl), GFP_KERNEL); |
057cbf49 | 448 | if (!nacl) { |
1a1ff825 | 449 | pr_err("Unable to allocate struct vhost_scsi_nacl\n"); |
057cbf49 NB |
450 | return NULL; |
451 | } | |
452 | ||
453 | return &nacl->se_node_acl; | |
454 | } | |
455 | ||
683bd967 | 456 | static void |
1a1ff825 | 457 | vhost_scsi_release_fabric_acl(struct se_portal_group *se_tpg, |
683bd967 | 458 | struct se_node_acl *se_nacl) |
057cbf49 | 459 | { |
1a1ff825 NB |
460 | struct vhost_scsi_nacl *nacl = container_of(se_nacl, |
461 | struct vhost_scsi_nacl, se_node_acl); | |
057cbf49 NB |
462 | kfree(nacl); |
463 | } | |
464 | ||
1a1ff825 | 465 | static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg) |
057cbf49 NB |
466 | { |
467 | return 1; | |
468 | } | |
469 | ||
1a1ff825 | 470 | static void vhost_scsi_release_cmd(struct se_cmd *se_cmd) |
057cbf49 | 471 | { |
1a1ff825 NB |
472 | struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd, |
473 | struct vhost_scsi_cmd, tvc_se_cmd); | |
de1419e4 | 474 | struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess; |
e31885dd | 475 | int i; |
084ed45b NB |
476 | |
477 | if (tv_cmd->tvc_sgl_count) { | |
084ed45b NB |
478 | for (i = 0; i < tv_cmd->tvc_sgl_count; i++) |
479 | put_page(sg_page(&tv_cmd->tvc_sgl[i])); | |
d3d665a6 | 480 | } |
e31885dd NB |
481 | if (tv_cmd->tvc_prot_sgl_count) { |
482 | for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++) | |
483 | put_page(sg_page(&tv_cmd->tvc_prot_sgl[i])); | |
484 | } | |
084ed45b | 485 | |
1a1ff825 | 486 | vhost_scsi_put_inflight(tv_cmd->inflight); |
4824d3bf | 487 | percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag); |
057cbf49 NB |
488 | } |
489 | ||
1a1ff825 | 490 | static int vhost_scsi_shutdown_session(struct se_session *se_sess) |
057cbf49 NB |
491 | { |
492 | return 0; | |
493 | } | |
494 | ||
1a1ff825 | 495 | static void vhost_scsi_close_session(struct se_session *se_sess) |
057cbf49 NB |
496 | { |
497 | return; | |
498 | } | |
499 | ||
1a1ff825 | 500 | static u32 vhost_scsi_sess_get_index(struct se_session *se_sess) |
057cbf49 NB |
501 | { |
502 | return 0; | |
503 | } | |
504 | ||
1a1ff825 | 505 | static int vhost_scsi_write_pending(struct se_cmd *se_cmd) |
057cbf49 NB |
506 | { |
507 | /* Go ahead and process the write immediately */ | |
508 | target_execute_cmd(se_cmd); | |
509 | return 0; | |
510 | } | |
511 | ||
1a1ff825 | 512 | static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd) |
057cbf49 NB |
513 | { |
514 | return 0; | |
515 | } | |
516 | ||
1a1ff825 | 517 | static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl) |
057cbf49 NB |
518 | { |
519 | return; | |
520 | } | |
521 | ||
1a1ff825 | 522 | static u32 vhost_scsi_get_task_tag(struct se_cmd *se_cmd) |
057cbf49 NB |
523 | { |
524 | return 0; | |
525 | } | |
526 | ||
1a1ff825 | 527 | static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd) |
057cbf49 NB |
528 | { |
529 | return 0; | |
530 | } | |
531 | ||
1a1ff825 | 532 | static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd) |
101998f6 | 533 | { |
3c63f66a | 534 | struct vhost_scsi *vs = cmd->tvc_vhost; |
101998f6 | 535 | |
3c63f66a | 536 | llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
101998f6 NB |
537 | |
538 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
539 | } | |
057cbf49 | 540 | |
1a1ff825 | 541 | static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd) |
057cbf49 | 542 | { |
1a1ff825 NB |
543 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
544 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 545 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
546 | return 0; |
547 | } | |
548 | ||
1a1ff825 | 549 | static int vhost_scsi_queue_status(struct se_cmd *se_cmd) |
057cbf49 | 550 | { |
1a1ff825 NB |
551 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
552 | struct vhost_scsi_cmd, tvc_se_cmd); | |
3c63f66a | 553 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
554 | return 0; |
555 | } | |
556 | ||
1a1ff825 | 557 | static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd) |
057cbf49 | 558 | { |
b79fafac | 559 | return; |
057cbf49 NB |
560 | } |
561 | ||
1a1ff825 | 562 | static void vhost_scsi_aborted_task(struct se_cmd *se_cmd) |
131e6abc NB |
563 | { |
564 | return; | |
565 | } | |
566 | ||
1a1ff825 | 567 | static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 AH |
568 | { |
569 | vs->vs_events_nr--; | |
570 | kfree(evt); | |
571 | } | |
572 | ||
1a1ff825 NB |
573 | static struct vhost_scsi_evt * |
574 | vhost_scsi_allocate_evt(struct vhost_scsi *vs, | |
683bd967 | 575 | u32 event, u32 reason) |
a6c9af87 | 576 | { |
3ab2e420 | 577 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
1a1ff825 | 578 | struct vhost_scsi_evt *evt; |
a6c9af87 AH |
579 | |
580 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
581 | vs->vs_events_missed = true; | |
582 | return NULL; | |
583 | } | |
584 | ||
585 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
586 | if (!evt) { | |
1a1ff825 | 587 | vq_err(vq, "Failed to allocate vhost_scsi_evt\n"); |
a6c9af87 AH |
588 | vs->vs_events_missed = true; |
589 | return NULL; | |
590 | } | |
591 | ||
e72fd72e MT |
592 | evt->event.event = cpu_to_vhost32(vq, event); |
593 | evt->event.reason = cpu_to_vhost32(vq, reason); | |
a6c9af87 AH |
594 | vs->vs_events_nr++; |
595 | ||
596 | return evt; | |
597 | } | |
598 | ||
1a1ff825 | 599 | static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd) |
057cbf49 | 600 | { |
3c63f66a | 601 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
602 | |
603 | /* TODO locking against target/backend threads? */ | |
6c131d0c | 604 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 605 | |
084ed45b | 606 | } |
f2f0173d | 607 | |
084ed45b NB |
608 | static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) |
609 | { | |
610 | return target_put_sess_cmd(se_cmd->se_sess, se_cmd); | |
057cbf49 NB |
611 | } |
612 | ||
683bd967 | 613 | static void |
1a1ff825 | 614 | vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
a6c9af87 | 615 | { |
3ab2e420 | 616 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
617 | struct virtio_scsi_event *event = &evt->event; |
618 | struct virtio_scsi_event __user *eventp; | |
619 | unsigned out, in; | |
620 | int head, ret; | |
621 | ||
622 | if (!vq->private_data) { | |
623 | vs->vs_events_missed = true; | |
624 | return; | |
625 | } | |
626 | ||
627 | again: | |
628 | vhost_disable_notify(&vs->dev, vq); | |
47283bef | 629 | head = vhost_get_vq_desc(vq, vq->iov, |
a6c9af87 AH |
630 | ARRAY_SIZE(vq->iov), &out, &in, |
631 | NULL, NULL); | |
632 | if (head < 0) { | |
633 | vs->vs_events_missed = true; | |
634 | return; | |
635 | } | |
636 | if (head == vq->num) { | |
637 | if (vhost_enable_notify(&vs->dev, vq)) | |
638 | goto again; | |
639 | vs->vs_events_missed = true; | |
640 | return; | |
641 | } | |
642 | ||
643 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { | |
644 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", | |
645 | vq->iov[out].iov_len); | |
646 | vs->vs_events_missed = true; | |
647 | return; | |
648 | } | |
649 | ||
650 | if (vs->vs_events_missed) { | |
e72fd72e | 651 | event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED); |
a6c9af87 AH |
652 | vs->vs_events_missed = false; |
653 | } | |
654 | ||
655 | eventp = vq->iov[out].iov_base; | |
656 | ret = __copy_to_user(eventp, event, sizeof(*event)); | |
657 | if (!ret) | |
658 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
659 | else | |
1a1ff825 | 660 | vq_err(vq, "Faulted on vhost_scsi_send_event\n"); |
a6c9af87 AH |
661 | } |
662 | ||
1a1ff825 | 663 | static void vhost_scsi_evt_work(struct vhost_work *work) |
a6c9af87 AH |
664 | { |
665 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
666 | vs_event_work); | |
3ab2e420 | 667 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
1a1ff825 | 668 | struct vhost_scsi_evt *evt; |
a6c9af87 AH |
669 | struct llist_node *llnode; |
670 | ||
671 | mutex_lock(&vq->mutex); | |
672 | llnode = llist_del_all(&vs->vs_event_list); | |
673 | while (llnode) { | |
1a1ff825 | 674 | evt = llist_entry(llnode, struct vhost_scsi_evt, list); |
a6c9af87 | 675 | llnode = llist_next(llnode); |
1a1ff825 NB |
676 | vhost_scsi_do_evt_work(vs, evt); |
677 | vhost_scsi_free_evt(vs, evt); | |
a6c9af87 AH |
678 | } |
679 | mutex_unlock(&vq->mutex); | |
680 | } | |
681 | ||
057cbf49 NB |
682 | /* Fill in status and signal that we are done processing this command |
683 | * | |
684 | * This is scheduled in the vhost work queue so we are called with the owner | |
685 | * process mm and can access the vring. | |
686 | */ | |
687 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) | |
688 | { | |
689 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
690 | vs_completion_work); | |
1b7f390e | 691 | DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 692 | struct virtio_scsi_cmd_resp v_rsp; |
1a1ff825 | 693 | struct vhost_scsi_cmd *cmd; |
9d6064a3 AH |
694 | struct llist_node *llnode; |
695 | struct se_cmd *se_cmd; | |
79c14141 | 696 | struct iov_iter iov_iter; |
1b7f390e | 697 | int ret, vq; |
057cbf49 | 698 | |
1b7f390e | 699 | bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 AH |
700 | llnode = llist_del_all(&vs->vs_completion_list); |
701 | while (llnode) { | |
1a1ff825 | 702 | cmd = llist_entry(llnode, struct vhost_scsi_cmd, |
9d6064a3 AH |
703 | tvc_completion_list); |
704 | llnode = llist_next(llnode); | |
3c63f66a | 705 | se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
706 | |
707 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
3c63f66a | 708 | cmd, se_cmd->residual_count, se_cmd->scsi_status); |
057cbf49 NB |
709 | |
710 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
e72fd72e | 711 | v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count); |
057cbf49 NB |
712 | /* TODO is status_qualifier field needed? */ |
713 | v_rsp.status = se_cmd->scsi_status; | |
e72fd72e MT |
714 | v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq, |
715 | se_cmd->scsi_sense_length); | |
3c63f66a | 716 | memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
e72fd72e | 717 | se_cmd->scsi_sense_length); |
79c14141 NB |
718 | |
719 | iov_iter_init(&iov_iter, READ, cmd->tvc_resp_iov, | |
720 | cmd->tvc_in_iovs, sizeof(v_rsp)); | |
721 | ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter); | |
722 | if (likely(ret == sizeof(v_rsp))) { | |
3ab2e420 | 723 | struct vhost_scsi_virtqueue *q; |
3c63f66a AH |
724 | vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
725 | q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); | |
3ab2e420 | 726 | vq = q - vs->vqs; |
1b7f390e AH |
727 | __set_bit(vq, signal); |
728 | } else | |
057cbf49 NB |
729 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
730 | ||
3c63f66a | 731 | vhost_scsi_free_cmd(cmd); |
057cbf49 NB |
732 | } |
733 | ||
1b7f390e AH |
734 | vq = -1; |
735 | while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) | |
736 | < VHOST_SCSI_MAX_VQ) | |
3ab2e420 | 737 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
738 | } |
739 | ||
1a1ff825 NB |
740 | static struct vhost_scsi_cmd * |
741 | vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg, | |
95e7c434 NB |
742 | unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr, |
743 | u32 exp_data_len, int data_direction) | |
057cbf49 | 744 | { |
1a1ff825 NB |
745 | struct vhost_scsi_cmd *cmd; |
746 | struct vhost_scsi_nexus *tv_nexus; | |
4824d3bf | 747 | struct se_session *se_sess; |
b1935f68 | 748 | struct scatterlist *sg, *prot_sg; |
3aee26b4 | 749 | struct page **pages; |
4824d3bf | 750 | int tag; |
057cbf49 | 751 | |
98718312 | 752 | tv_nexus = tpg->tpg_nexus; |
057cbf49 | 753 | if (!tv_nexus) { |
1a1ff825 | 754 | pr_err("Unable to locate active struct vhost_scsi_nexus\n"); |
057cbf49 NB |
755 | return ERR_PTR(-EIO); |
756 | } | |
4824d3bf | 757 | se_sess = tv_nexus->tvn_se_sess; |
057cbf49 | 758 | |
6f6b5d1e | 759 | tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING); |
4a47d3a1 | 760 | if (tag < 0) { |
1a1ff825 | 761 | pr_err("Unable to obtain tag for vhost_scsi_cmd\n"); |
4a47d3a1 NB |
762 | return ERR_PTR(-ENOMEM); |
763 | } | |
764 | ||
1a1ff825 | 765 | cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag]; |
3aee26b4 | 766 | sg = cmd->tvc_sgl; |
b1935f68 | 767 | prot_sg = cmd->tvc_prot_sgl; |
3aee26b4 | 768 | pages = cmd->tvc_upages; |
1a1ff825 | 769 | memset(cmd, 0, sizeof(struct vhost_scsi_cmd)); |
4824d3bf | 770 | |
3aee26b4 | 771 | cmd->tvc_sgl = sg; |
b1935f68 | 772 | cmd->tvc_prot_sgl = prot_sg; |
3aee26b4 | 773 | cmd->tvc_upages = pages; |
4824d3bf | 774 | cmd->tvc_se_cmd.map_tag = tag; |
95e7c434 NB |
775 | cmd->tvc_tag = scsi_tag; |
776 | cmd->tvc_lun = lun; | |
777 | cmd->tvc_task_attr = task_attr; | |
3c63f66a AH |
778 | cmd->tvc_exp_data_len = exp_data_len; |
779 | cmd->tvc_data_direction = data_direction; | |
780 | cmd->tvc_nexus = tv_nexus; | |
1a1ff825 | 781 | cmd->inflight = vhost_scsi_get_inflight(vq); |
3c63f66a | 782 | |
1a1ff825 | 783 | memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE); |
95e7c434 | 784 | |
3c63f66a | 785 | return cmd; |
057cbf49 NB |
786 | } |
787 | ||
788 | /* | |
789 | * Map a user memory range into a scatterlist | |
790 | * | |
791 | * Returns the number of scatterlist entries used or -errno on error. | |
792 | */ | |
683bd967 | 793 | static int |
1a1ff825 | 794 | vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd, |
b4078b5f NB |
795 | void __user *ptr, |
796 | size_t len, | |
3aee26b4 | 797 | struct scatterlist *sgl, |
5a01d082 | 798 | bool write) |
057cbf49 | 799 | { |
b4078b5f NB |
800 | unsigned int npages = 0, offset, nbytes; |
801 | unsigned int pages_nr = iov_num_pages(ptr, len); | |
057cbf49 | 802 | struct scatterlist *sg = sgl; |
b4078b5f | 803 | struct page **pages = cmd->tvc_upages; |
1810053e | 804 | int ret, i; |
057cbf49 | 805 | |
1a1ff825 | 806 | if (pages_nr > VHOST_SCSI_PREALLOC_UPAGES) { |
3aee26b4 | 807 | pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than" |
1a1ff825 NB |
808 | " preallocated VHOST_SCSI_PREALLOC_UPAGES: %u\n", |
809 | pages_nr, VHOST_SCSI_PREALLOC_UPAGES); | |
3aee26b4 NB |
810 | return -ENOBUFS; |
811 | } | |
812 | ||
1810053e AH |
813 | ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages); |
814 | /* No pages were pinned */ | |
815 | if (ret < 0) | |
816 | goto out; | |
817 | /* Less pages pinned than wanted */ | |
818 | if (ret != pages_nr) { | |
819 | for (i = 0; i < ret; i++) | |
820 | put_page(pages[i]); | |
821 | ret = -EFAULT; | |
822 | goto out; | |
823 | } | |
824 | ||
825 | while (len > 0) { | |
826 | offset = (uintptr_t)ptr & ~PAGE_MASK; | |
827 | nbytes = min_t(unsigned int, PAGE_SIZE - offset, len); | |
828 | sg_set_page(sg, pages[npages], nbytes, offset); | |
057cbf49 NB |
829 | ptr += nbytes; |
830 | len -= nbytes; | |
831 | sg++; | |
832 | npages++; | |
833 | } | |
057cbf49 | 834 | |
1810053e | 835 | out: |
057cbf49 NB |
836 | return ret; |
837 | } | |
838 | ||
683bd967 | 839 | static int |
e8de56b5 | 840 | vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls) |
057cbf49 | 841 | { |
e8de56b5 | 842 | int sgl_count = 0; |
057cbf49 | 843 | |
e8de56b5 NB |
844 | if (!iter || !iter->iov) { |
845 | pr_err("%s: iter->iov is NULL, but expected bytes: %zu" | |
846 | " present\n", __func__, bytes); | |
847 | return -EINVAL; | |
848 | } | |
f3158f36 | 849 | |
e8de56b5 NB |
850 | sgl_count = iov_iter_npages(iter, 0xffff); |
851 | if (sgl_count > max_sgls) { | |
852 | pr_err("%s: requested sgl_count: %d exceeds pre-allocated" | |
853 | " max_sgls: %d\n", __func__, sgl_count, max_sgls); | |
854 | return -EINVAL; | |
5a01d082 | 855 | } |
e8de56b5 NB |
856 | return sgl_count; |
857 | } | |
057cbf49 | 858 | |
e8de56b5 | 859 | static int |
1a1ff825 NB |
860 | vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write, |
861 | struct iov_iter *iter, | |
862 | struct scatterlist *sg, int sg_count) | |
e8de56b5 NB |
863 | { |
864 | size_t off = iter->iov_offset; | |
865 | int i, ret; | |
057cbf49 | 866 | |
e8de56b5 NB |
867 | for (i = 0; i < iter->nr_segs; i++) { |
868 | void __user *base = iter->iov[i].iov_base + off; | |
869 | size_t len = iter->iov[i].iov_len - off; | |
5a01d082 | 870 | |
e8de56b5 | 871 | ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write); |
057cbf49 | 872 | if (ret < 0) { |
e8de56b5 NB |
873 | for (i = 0; i < sg_count; i++) { |
874 | struct page *page = sg_page(&sg[i]); | |
875 | if (page) | |
876 | put_page(page); | |
877 | } | |
057cbf49 NB |
878 | return ret; |
879 | } | |
057cbf49 | 880 | sg += ret; |
e8de56b5 | 881 | off = 0; |
057cbf49 NB |
882 | } |
883 | return 0; | |
884 | } | |
885 | ||
e31885dd | 886 | static int |
1a1ff825 | 887 | vhost_scsi_mapal(struct vhost_scsi_cmd *cmd, |
e8de56b5 NB |
888 | size_t prot_bytes, struct iov_iter *prot_iter, |
889 | size_t data_bytes, struct iov_iter *data_iter) | |
890 | { | |
891 | int sgl_count, ret; | |
892 | bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE); | |
893 | ||
894 | if (prot_bytes) { | |
895 | sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes, | |
1a1ff825 | 896 | VHOST_SCSI_PREALLOC_PROT_SGLS); |
e8de56b5 NB |
897 | if (sgl_count < 0) |
898 | return sgl_count; | |
899 | ||
900 | sg_init_table(cmd->tvc_prot_sgl, sgl_count); | |
901 | cmd->tvc_prot_sgl_count = sgl_count; | |
902 | pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__, | |
903 | cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count); | |
904 | ||
905 | ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter, | |
906 | cmd->tvc_prot_sgl, | |
907 | cmd->tvc_prot_sgl_count); | |
e31885dd | 908 | if (ret < 0) { |
e31885dd NB |
909 | cmd->tvc_prot_sgl_count = 0; |
910 | return ret; | |
911 | } | |
e8de56b5 NB |
912 | } |
913 | sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes, | |
1a1ff825 | 914 | VHOST_SCSI_PREALLOC_SGLS); |
e8de56b5 NB |
915 | if (sgl_count < 0) |
916 | return sgl_count; | |
917 | ||
918 | sg_init_table(cmd->tvc_sgl, sgl_count); | |
919 | cmd->tvc_sgl_count = sgl_count; | |
920 | pr_debug("%s data_sg %p data_sgl_count %u\n", __func__, | |
921 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
922 | ||
923 | ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter, | |
924 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
925 | if (ret < 0) { | |
926 | cmd->tvc_sgl_count = 0; | |
927 | return ret; | |
e31885dd NB |
928 | } |
929 | return 0; | |
930 | } | |
931 | ||
46243860 NB |
932 | static int vhost_scsi_to_tcm_attr(int attr) |
933 | { | |
934 | switch (attr) { | |
935 | case VIRTIO_SCSI_S_SIMPLE: | |
936 | return TCM_SIMPLE_TAG; | |
937 | case VIRTIO_SCSI_S_ORDERED: | |
938 | return TCM_ORDERED_TAG; | |
939 | case VIRTIO_SCSI_S_HEAD: | |
940 | return TCM_HEAD_TAG; | |
941 | case VIRTIO_SCSI_S_ACA: | |
942 | return TCM_ACA_TAG; | |
943 | default: | |
944 | break; | |
945 | } | |
946 | return TCM_SIMPLE_TAG; | |
947 | } | |
948 | ||
1a1ff825 | 949 | static void vhost_scsi_submission_work(struct work_struct *work) |
057cbf49 | 950 | { |
1a1ff825 NB |
951 | struct vhost_scsi_cmd *cmd = |
952 | container_of(work, struct vhost_scsi_cmd, work); | |
953 | struct vhost_scsi_nexus *tv_nexus; | |
3c63f66a | 954 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
95e7c434 NB |
955 | struct scatterlist *sg_ptr, *sg_prot_ptr = NULL; |
956 | int rc; | |
057cbf49 | 957 | |
95e7c434 | 958 | /* FIXME: BIDI operation */ |
3c63f66a AH |
959 | if (cmd->tvc_sgl_count) { |
960 | sg_ptr = cmd->tvc_sgl; | |
95e7c434 NB |
961 | |
962 | if (cmd->tvc_prot_sgl_count) | |
963 | sg_prot_ptr = cmd->tvc_prot_sgl; | |
964 | else | |
965 | se_cmd->prot_pto = true; | |
057cbf49 NB |
966 | } else { |
967 | sg_ptr = NULL; | |
968 | } | |
3c63f66a | 969 | tv_nexus = cmd->tvc_nexus; |
9f0abc15 NB |
970 | |
971 | rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, | |
3c63f66a AH |
972 | cmd->tvc_cdb, &cmd->tvc_sense_buf[0], |
973 | cmd->tvc_lun, cmd->tvc_exp_data_len, | |
46243860 NB |
974 | vhost_scsi_to_tcm_attr(cmd->tvc_task_attr), |
975 | cmd->tvc_data_direction, TARGET_SCF_ACK_KREF, | |
976 | sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr, | |
977 | cmd->tvc_prot_sgl_count); | |
057cbf49 NB |
978 | if (rc < 0) { |
979 | transport_send_check_condition_and_sense(se_cmd, | |
9f0abc15 | 980 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
057cbf49 | 981 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 982 | } |
057cbf49 NB |
983 | } |
984 | ||
683bd967 AH |
985 | static void |
986 | vhost_scsi_send_bad_target(struct vhost_scsi *vs, | |
987 | struct vhost_virtqueue *vq, | |
988 | int head, unsigned out) | |
637ab21e AH |
989 | { |
990 | struct virtio_scsi_cmd_resp __user *resp; | |
991 | struct virtio_scsi_cmd_resp rsp; | |
992 | int ret; | |
993 | ||
994 | memset(&rsp, 0, sizeof(rsp)); | |
995 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
996 | resp = vq->iov[out].iov_base; | |
997 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
998 | if (!ret) | |
999 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
1000 | else | |
1001 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
1002 | } | |
1003 | ||
683bd967 AH |
1004 | static void |
1005 | vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
057cbf49 | 1006 | { |
1a1ff825 | 1007 | struct vhost_scsi_tpg **vs_tpg, *tpg; |
057cbf49 | 1008 | struct virtio_scsi_cmd_req v_req; |
95e7c434 | 1009 | struct virtio_scsi_cmd_req_pi v_req_pi; |
1a1ff825 | 1010 | struct vhost_scsi_cmd *cmd; |
09b13fa8 | 1011 | struct iov_iter out_iter, in_iter, prot_iter, data_iter; |
95e7c434 | 1012 | u64 tag; |
09b13fa8 NB |
1013 | u32 exp_data_len, data_direction; |
1014 | unsigned out, in; | |
1015 | int head, ret, prot_bytes; | |
1016 | size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp); | |
1017 | size_t out_size, in_size; | |
95e7c434 NB |
1018 | u16 lun; |
1019 | u8 *target, *lunp, task_attr; | |
09b13fa8 | 1020 | bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI); |
95e7c434 | 1021 | void *req, *cdb; |
057cbf49 | 1022 | |
e7802212 | 1023 | mutex_lock(&vq->mutex); |
4f7f46d3 AH |
1024 | /* |
1025 | * We can handle the vq only after the endpoint is setup by calling the | |
1026 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
4f7f46d3 | 1027 | */ |
e7802212 | 1028 | vs_tpg = vq->private_data; |
4f7f46d3 | 1029 | if (!vs_tpg) |
e7802212 | 1030 | goto out; |
057cbf49 | 1031 | |
057cbf49 NB |
1032 | vhost_disable_notify(&vs->dev, vq); |
1033 | ||
1034 | for (;;) { | |
47283bef | 1035 | head = vhost_get_vq_desc(vq, vq->iov, |
09b13fa8 NB |
1036 | ARRAY_SIZE(vq->iov), &out, &in, |
1037 | NULL, NULL); | |
057cbf49 | 1038 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", |
09b13fa8 | 1039 | head, out, in); |
057cbf49 NB |
1040 | /* On error, stop handling until the next kick. */ |
1041 | if (unlikely(head < 0)) | |
1042 | break; | |
1043 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
1044 | if (head == vq->num) { | |
1045 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
1046 | vhost_disable_notify(&vs->dev, vq); | |
1047 | continue; | |
1048 | } | |
1049 | break; | |
1050 | } | |
057cbf49 | 1051 | /* |
09b13fa8 NB |
1052 | * Check for a sane response buffer so we can report early |
1053 | * errors back to the guest. | |
057cbf49 | 1054 | */ |
09b13fa8 NB |
1055 | if (unlikely(vq->iov[out].iov_len < rsp_size)) { |
1056 | vq_err(vq, "Expecting at least virtio_scsi_cmd_resp" | |
1057 | " size, got %zu bytes\n", vq->iov[out].iov_len); | |
057cbf49 NB |
1058 | break; |
1059 | } | |
09b13fa8 NB |
1060 | /* |
1061 | * Setup pointers and values based upon different virtio-scsi | |
1062 | * request header if T10_PI is enabled in KVM guest. | |
1063 | */ | |
1064 | if (t10_pi) { | |
95e7c434 | 1065 | req = &v_req_pi; |
09b13fa8 | 1066 | req_size = sizeof(v_req_pi); |
95e7c434 NB |
1067 | lunp = &v_req_pi.lun[0]; |
1068 | target = &v_req_pi.lun[1]; | |
95e7c434 NB |
1069 | } else { |
1070 | req = &v_req; | |
09b13fa8 | 1071 | req_size = sizeof(v_req); |
95e7c434 NB |
1072 | lunp = &v_req.lun[0]; |
1073 | target = &v_req.lun[1]; | |
95e7c434 | 1074 | } |
09b13fa8 NB |
1075 | /* |
1076 | * FIXME: Not correct for BIDI operation | |
1077 | */ | |
1078 | out_size = iov_length(vq->iov, out); | |
1079 | in_size = iov_length(&vq->iov[out], in); | |
95e7c434 | 1080 | |
09b13fa8 NB |
1081 | /* |
1082 | * Copy over the virtio-scsi request header, which for a | |
1083 | * ANY_LAYOUT enabled guest may span multiple iovecs, or a | |
1084 | * single iovec may contain both the header + outgoing | |
1085 | * WRITE payloads. | |
1086 | * | |
1087 | * copy_from_iter() will advance out_iter, so that it will | |
1088 | * point at the start of the outgoing WRITE payload, if | |
1089 | * DMA_TO_DEVICE is set. | |
1090 | */ | |
1091 | iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size); | |
057cbf49 | 1092 | |
09b13fa8 NB |
1093 | ret = copy_from_iter(req, req_size, &out_iter); |
1094 | if (unlikely(ret != req_size)) { | |
1095 | vq_err(vq, "Faulted on copy_from_iter\n"); | |
de1419e4 NB |
1096 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1097 | continue; | |
057cbf49 | 1098 | } |
7fe412d0 | 1099 | /* virtio-scsi spec requires byte 0 of the lun to be 1 */ |
95e7c434 | 1100 | if (unlikely(*lunp != 1)) { |
09b13fa8 | 1101 | vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp); |
7fe412d0 VS |
1102 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1103 | continue; | |
1104 | } | |
1105 | ||
95e7c434 | 1106 | tpg = ACCESS_ONCE(vs_tpg[*target]); |
98718312 | 1107 | if (unlikely(!tpg)) { |
09b13fa8 | 1108 | /* Target does not exist, fail the request */ |
637ab21e | 1109 | vhost_scsi_send_bad_target(vs, vq, head, out); |
67e18cf9 AH |
1110 | continue; |
1111 | } | |
95e7c434 | 1112 | /* |
09b13fa8 NB |
1113 | * Determine data_direction by calculating the total outgoing |
1114 | * iovec sizes + incoming iovec sizes vs. virtio-scsi request + | |
1115 | * response headers respectively. | |
95e7c434 | 1116 | * |
09b13fa8 NB |
1117 | * For DMA_TO_DEVICE this is out_iter, which is already pointing |
1118 | * to the right place. | |
1119 | * | |
1120 | * For DMA_FROM_DEVICE, the iovec will be just past the end | |
1121 | * of the virtio-scsi response header in either the same | |
1122 | * or immediately following iovec. | |
95e7c434 | 1123 | * |
09b13fa8 NB |
1124 | * Any associated T10_PI bytes for the outgoing / incoming |
1125 | * payloads are included in calculation of exp_data_len here. | |
95e7c434 | 1126 | */ |
09b13fa8 NB |
1127 | prot_bytes = 0; |
1128 | ||
1129 | if (out_size > req_size) { | |
1130 | data_direction = DMA_TO_DEVICE; | |
1131 | exp_data_len = out_size - req_size; | |
1132 | data_iter = out_iter; | |
1133 | } else if (in_size > rsp_size) { | |
1134 | data_direction = DMA_FROM_DEVICE; | |
1135 | exp_data_len = in_size - rsp_size; | |
1136 | ||
1137 | iov_iter_init(&in_iter, READ, &vq->iov[out], in, | |
1138 | rsp_size + exp_data_len); | |
1139 | iov_iter_advance(&in_iter, rsp_size); | |
1140 | data_iter = in_iter; | |
1141 | } else { | |
1142 | data_direction = DMA_NONE; | |
1143 | exp_data_len = 0; | |
1144 | } | |
1145 | /* | |
1146 | * If T10_PI header + payload is present, setup prot_iter values | |
1147 | * and recalculate data_iter for vhost_scsi_mapal() mapping to | |
1148 | * host scatterlists via get_user_pages_fast(). | |
95e7c434 | 1149 | */ |
09b13fa8 | 1150 | if (t10_pi) { |
95e7c434 NB |
1151 | if (v_req_pi.pi_bytesout) { |
1152 | if (data_direction != DMA_TO_DEVICE) { | |
09b13fa8 NB |
1153 | vq_err(vq, "Received non zero pi_bytesout," |
1154 | " but wrong data_direction\n"); | |
de1419e4 NB |
1155 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1156 | continue; | |
95e7c434 | 1157 | } |
e72fd72e | 1158 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout); |
95e7c434 NB |
1159 | } else if (v_req_pi.pi_bytesin) { |
1160 | if (data_direction != DMA_FROM_DEVICE) { | |
09b13fa8 NB |
1161 | vq_err(vq, "Received non zero pi_bytesin," |
1162 | " but wrong data_direction\n"); | |
de1419e4 NB |
1163 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1164 | continue; | |
95e7c434 | 1165 | } |
e72fd72e | 1166 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin); |
95e7c434 | 1167 | } |
09b13fa8 NB |
1168 | /* |
1169 | * Set prot_iter to data_iter, and advance past any | |
1170 | * preceeding prot_bytes that may be present. | |
1171 | * | |
1172 | * Also fix up the exp_data_len to reflect only the | |
1173 | * actual data payload length. | |
1174 | */ | |
95e7c434 | 1175 | if (prot_bytes) { |
09b13fa8 NB |
1176 | exp_data_len -= prot_bytes; |
1177 | prot_iter = data_iter; | |
1178 | iov_iter_advance(&data_iter, prot_bytes); | |
95e7c434 | 1179 | } |
e72fd72e | 1180 | tag = vhost64_to_cpu(vq, v_req_pi.tag); |
95e7c434 NB |
1181 | task_attr = v_req_pi.task_attr; |
1182 | cdb = &v_req_pi.cdb[0]; | |
1183 | lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF; | |
1184 | } else { | |
e72fd72e | 1185 | tag = vhost64_to_cpu(vq, v_req.tag); |
95e7c434 NB |
1186 | task_attr = v_req.task_attr; |
1187 | cdb = &v_req.cdb[0]; | |
1188 | lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; | |
1189 | } | |
95e7c434 | 1190 | /* |
09b13fa8 NB |
1191 | * Check that the received CDB size does not exceeded our |
1192 | * hardcoded max for vhost-scsi, then get a pre-allocated | |
1193 | * cmd descriptor for the new virtio-scsi tag. | |
95e7c434 NB |
1194 | * |
1195 | * TODO what if cdb was too small for varlen cdb header? | |
1196 | */ | |
1a1ff825 | 1197 | if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) { |
95e7c434 NB |
1198 | vq_err(vq, "Received SCSI CDB with command_size: %d that" |
1199 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
1a1ff825 | 1200 | scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE); |
de1419e4 NB |
1201 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1202 | continue; | |
95e7c434 | 1203 | } |
95e7c434 | 1204 | cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr, |
9f977ef7 NB |
1205 | exp_data_len + prot_bytes, |
1206 | data_direction); | |
3c63f66a | 1207 | if (IS_ERR(cmd)) { |
4824d3bf | 1208 | vq_err(vq, "vhost_scsi_get_tag failed %ld\n", |
09b13fa8 | 1209 | PTR_ERR(cmd)); |
de1419e4 NB |
1210 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1211 | continue; | |
057cbf49 | 1212 | } |
3c63f66a AH |
1213 | cmd->tvc_vhost = vs; |
1214 | cmd->tvc_vq = vq; | |
79c14141 NB |
1215 | cmd->tvc_resp_iov = &vq->iov[out]; |
1216 | cmd->tvc_in_iovs = in; | |
057cbf49 | 1217 | |
057cbf49 | 1218 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", |
09b13fa8 NB |
1219 | cmd->tvc_cdb[0], cmd->tvc_lun); |
1220 | pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:" | |
1221 | " %d\n", cmd, exp_data_len, prot_bytes, data_direction); | |
057cbf49 NB |
1222 | |
1223 | if (data_direction != DMA_NONE) { | |
09b13fa8 NB |
1224 | ret = vhost_scsi_mapal(cmd, |
1225 | prot_bytes, &prot_iter, | |
1226 | exp_data_len, &data_iter); | |
057cbf49 NB |
1227 | if (unlikely(ret)) { |
1228 | vq_err(vq, "Failed to map iov to sgl\n"); | |
1a1ff825 | 1229 | vhost_scsi_release_cmd(&cmd->tvc_se_cmd); |
de1419e4 NB |
1230 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1231 | continue; | |
057cbf49 NB |
1232 | } |
1233 | } | |
057cbf49 NB |
1234 | /* |
1235 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
1236 | * complete the virtio-scsi request in TCM callback context via | |
09b13fa8 | 1237 | * vhost_scsi_queue_data_in() and vhost_scsi_queue_status() |
057cbf49 | 1238 | */ |
3c63f66a | 1239 | cmd->tvc_vq_desc = head; |
057cbf49 | 1240 | /* |
09b13fa8 NB |
1241 | * Dispatch cmd descriptor for cmwq execution in process |
1242 | * context provided by vhost_scsi_workqueue. This also ensures | |
1243 | * cmd is executed on the same kworker CPU as this vhost | |
1244 | * thread to gain positive L2 cache locality effects. | |
057cbf49 | 1245 | */ |
1a1ff825 NB |
1246 | INIT_WORK(&cmd->work, vhost_scsi_submission_work); |
1247 | queue_work(vhost_scsi_workqueue, &cmd->work); | |
057cbf49 | 1248 | } |
e7802212 | 1249 | out: |
7ea206cf | 1250 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
1251 | } |
1252 | ||
1253 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) | |
1254 | { | |
101998f6 | 1255 | pr_debug("%s: The handling func for control queue.\n", __func__); |
057cbf49 NB |
1256 | } |
1257 | ||
683bd967 | 1258 | static void |
1a1ff825 NB |
1259 | vhost_scsi_send_evt(struct vhost_scsi *vs, |
1260 | struct vhost_scsi_tpg *tpg, | |
683bd967 AH |
1261 | struct se_lun *lun, |
1262 | u32 event, | |
1263 | u32 reason) | |
a6c9af87 | 1264 | { |
1a1ff825 | 1265 | struct vhost_scsi_evt *evt; |
a6c9af87 | 1266 | |
1a1ff825 | 1267 | evt = vhost_scsi_allocate_evt(vs, event, reason); |
a6c9af87 AH |
1268 | if (!evt) |
1269 | return; | |
1270 | ||
1271 | if (tpg && lun) { | |
1272 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
1273 | /* | |
1274 | * Note: evt->event is zeroed when we allocate it and | |
1275 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
1276 | */ | |
1277 | evt->event.lun[0] = 0x01; | |
59c816c1 | 1278 | evt->event.lun[1] = tpg->tport_tpgt; |
a6c9af87 AH |
1279 | if (lun->unpacked_lun >= 256) |
1280 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
1281 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
1282 | } | |
1283 | ||
1284 | llist_add(&evt->list, &vs->vs_event_list); | |
1285 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
1286 | } | |
1287 | ||
057cbf49 NB |
1288 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
1289 | { | |
a6c9af87 AH |
1290 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1291 | poll.work); | |
1292 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1293 | ||
1294 | mutex_lock(&vq->mutex); | |
1295 | if (!vq->private_data) | |
1296 | goto out; | |
1297 | ||
1298 | if (vs->vs_events_missed) | |
1a1ff825 | 1299 | vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); |
a6c9af87 AH |
1300 | out: |
1301 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
1302 | } |
1303 | ||
1304 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
1305 | { | |
1306 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
1307 | poll.work); | |
1308 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1309 | ||
1b7f390e | 1310 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
1311 | } |
1312 | ||
4f7f46d3 AH |
1313 | static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
1314 | { | |
3ab2e420 | 1315 | vhost_poll_flush(&vs->vqs[index].vq.poll); |
4f7f46d3 AH |
1316 | } |
1317 | ||
3dfbff32 | 1318 | /* Callers must hold dev mutex */ |
4f7f46d3 AH |
1319 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
1320 | { | |
f2f0173d | 1321 | struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; |
4f7f46d3 AH |
1322 | int i; |
1323 | ||
f2f0173d | 1324 | /* Init new inflight and remember the old inflight */ |
1a1ff825 | 1325 | vhost_scsi_init_inflight(vs, old_inflight); |
f2f0173d AH |
1326 | |
1327 | /* | |
1328 | * The inflight->kref was initialized to 1. We decrement it here to | |
1329 | * indicate the start of the flush operation so that it will reach 0 | |
1330 | * when all the reqs are finished. | |
1331 | */ | |
1332 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1a1ff825 | 1333 | kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight); |
f2f0173d AH |
1334 | |
1335 | /* Flush both the vhost poll and vhost work */ | |
4f7f46d3 AH |
1336 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
1337 | vhost_scsi_flush_vq(vs, i); | |
1338 | vhost_work_flush(&vs->dev, &vs->vs_completion_work); | |
a6c9af87 | 1339 | vhost_work_flush(&vs->dev, &vs->vs_event_work); |
f2f0173d AH |
1340 | |
1341 | /* Wait for all reqs issued before the flush to be finished */ | |
1342 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1343 | wait_for_completion(&old_inflight[i]->comp); | |
4f7f46d3 AH |
1344 | } |
1345 | ||
057cbf49 NB |
1346 | /* |
1347 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
1a1ff825 | 1348 | * vhost_scsi_tpg with an active struct vhost_scsi_nexus |
f2b7daf5 AH |
1349 | * |
1350 | * The lock nesting rule is: | |
1a1ff825 | 1351 | * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex |
057cbf49 | 1352 | */ |
683bd967 AH |
1353 | static int |
1354 | vhost_scsi_set_endpoint(struct vhost_scsi *vs, | |
1355 | struct vhost_scsi_target *t) | |
057cbf49 | 1356 | { |
ab8edab1 | 1357 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1358 | struct vhost_scsi_tport *tv_tport; |
1359 | struct vhost_scsi_tpg *tpg; | |
1360 | struct vhost_scsi_tpg **vs_tpg; | |
4f7f46d3 AH |
1361 | struct vhost_virtqueue *vq; |
1362 | int index, ret, i, len; | |
67e18cf9 | 1363 | bool match = false; |
057cbf49 | 1364 | |
1a1ff825 | 1365 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 1366 | mutex_lock(&vs->dev.mutex); |
f2b7daf5 | 1367 | |
057cbf49 NB |
1368 | /* Verify that ring has been setup correctly. */ |
1369 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
1370 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 1371 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
1372 | ret = -EFAULT; |
1373 | goto out; | |
057cbf49 NB |
1374 | } |
1375 | } | |
057cbf49 | 1376 | |
4f7f46d3 AH |
1377 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
1378 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
1379 | if (!vs_tpg) { | |
f2b7daf5 AH |
1380 | ret = -ENOMEM; |
1381 | goto out; | |
4f7f46d3 AH |
1382 | } |
1383 | if (vs->vs_tpg) | |
1384 | memcpy(vs_tpg, vs->vs_tpg, len); | |
1385 | ||
1a1ff825 | 1386 | list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) { |
98718312 AH |
1387 | mutex_lock(&tpg->tv_tpg_mutex); |
1388 | if (!tpg->tpg_nexus) { | |
1389 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1390 | continue; |
1391 | } | |
98718312 AH |
1392 | if (tpg->tv_tpg_vhost_count != 0) { |
1393 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1394 | continue; |
1395 | } | |
98718312 | 1396 | tv_tport = tpg->tport; |
057cbf49 | 1397 | |
67e18cf9 | 1398 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
98718312 | 1399 | if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
4f7f46d3 | 1400 | kfree(vs_tpg); |
98718312 | 1401 | mutex_unlock(&tpg->tv_tpg_mutex); |
f2b7daf5 AH |
1402 | ret = -EEXIST; |
1403 | goto out; | |
101998f6 | 1404 | } |
ab8edab1 NB |
1405 | /* |
1406 | * In order to ensure individual vhost-scsi configfs | |
1407 | * groups cannot be removed while in use by vhost ioctl, | |
1408 | * go ahead and take an explicit se_tpg->tpg_group.cg_item | |
1409 | * dependency now. | |
1410 | */ | |
1411 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1412 | ret = target_depend_item(&se_tpg->tpg_group.cg_item); |
ab8edab1 NB |
1413 | if (ret) { |
1414 | pr_warn("configfs_depend_item() failed: %d\n", ret); | |
1415 | kfree(vs_tpg); | |
1416 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1417 | goto out; | |
1418 | } | |
98718312 AH |
1419 | tpg->tv_tpg_vhost_count++; |
1420 | tpg->vhost_scsi = vs; | |
1421 | vs_tpg[tpg->tport_tpgt] = tpg; | |
4e857c58 | 1422 | smp_mb__after_atomic(); |
67e18cf9 | 1423 | match = true; |
057cbf49 | 1424 | } |
98718312 | 1425 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1426 | } |
67e18cf9 AH |
1427 | |
1428 | if (match) { | |
1429 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1430 | sizeof(vs->vs_vhost_wwpn)); | |
4f7f46d3 | 1431 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
3ab2e420 | 1432 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1433 | mutex_lock(&vq->mutex); |
22fa90c7 | 1434 | vq->private_data = vs_tpg; |
dfd5d569 | 1435 | vhost_init_used(vq); |
4f7f46d3 AH |
1436 | mutex_unlock(&vq->mutex); |
1437 | } | |
67e18cf9 AH |
1438 | ret = 0; |
1439 | } else { | |
1440 | ret = -EEXIST; | |
1441 | } | |
1442 | ||
4f7f46d3 AH |
1443 | /* |
1444 | * Act as synchronize_rcu to make sure access to | |
1445 | * old vs->vs_tpg is finished. | |
1446 | */ | |
1447 | vhost_scsi_flush(vs); | |
1448 | kfree(vs->vs_tpg); | |
1449 | vs->vs_tpg = vs_tpg; | |
1450 | ||
f2b7daf5 | 1451 | out: |
67e18cf9 | 1452 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1453 | mutex_unlock(&vhost_scsi_mutex); |
67e18cf9 | 1454 | return ret; |
057cbf49 NB |
1455 | } |
1456 | ||
683bd967 AH |
1457 | static int |
1458 | vhost_scsi_clear_endpoint(struct vhost_scsi *vs, | |
1459 | struct vhost_scsi_target *t) | |
057cbf49 | 1460 | { |
ab8edab1 | 1461 | struct se_portal_group *se_tpg; |
1a1ff825 NB |
1462 | struct vhost_scsi_tport *tv_tport; |
1463 | struct vhost_scsi_tpg *tpg; | |
4f7f46d3 AH |
1464 | struct vhost_virtqueue *vq; |
1465 | bool match = false; | |
67e18cf9 AH |
1466 | int index, ret, i; |
1467 | u8 target; | |
057cbf49 | 1468 | |
1a1ff825 | 1469 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 NB |
1470 | mutex_lock(&vs->dev.mutex); |
1471 | /* Verify that ring has been setup correctly. */ | |
1472 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1473 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1474 | ret = -EFAULT; |
038e0af4 | 1475 | goto err_dev; |
057cbf49 NB |
1476 | } |
1477 | } | |
4f7f46d3 AH |
1478 | |
1479 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1480 | ret = 0; |
1481 | goto err_dev; | |
4f7f46d3 AH |
1482 | } |
1483 | ||
67e18cf9 AH |
1484 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1485 | target = i; | |
98718312 AH |
1486 | tpg = vs->vs_tpg[target]; |
1487 | if (!tpg) | |
67e18cf9 AH |
1488 | continue; |
1489 | ||
98718312 AH |
1490 | mutex_lock(&tpg->tv_tpg_mutex); |
1491 | tv_tport = tpg->tport; | |
67e18cf9 AH |
1492 | if (!tv_tport) { |
1493 | ret = -ENODEV; | |
038e0af4 | 1494 | goto err_tpg; |
67e18cf9 AH |
1495 | } |
1496 | ||
1497 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
98718312 | 1498 | pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" |
67e18cf9 | 1499 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", |
98718312 | 1500 | tv_tport->tport_name, tpg->tport_tpgt, |
67e18cf9 AH |
1501 | t->vhost_wwpn, t->vhost_tpgt); |
1502 | ret = -EINVAL; | |
038e0af4 | 1503 | goto err_tpg; |
67e18cf9 | 1504 | } |
98718312 AH |
1505 | tpg->tv_tpg_vhost_count--; |
1506 | tpg->vhost_scsi = NULL; | |
67e18cf9 | 1507 | vs->vs_tpg[target] = NULL; |
4f7f46d3 | 1508 | match = true; |
98718312 | 1509 | mutex_unlock(&tpg->tv_tpg_mutex); |
ab8edab1 NB |
1510 | /* |
1511 | * Release se_tpg->tpg_group.cg_item configfs dependency now | |
1512 | * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur. | |
1513 | */ | |
1514 | se_tpg = &tpg->se_tpg; | |
d588cf8f | 1515 | target_undepend_item(&se_tpg->tpg_group.cg_item); |
057cbf49 | 1516 | } |
4f7f46d3 AH |
1517 | if (match) { |
1518 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
3ab2e420 | 1519 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1520 | mutex_lock(&vq->mutex); |
22fa90c7 | 1521 | vq->private_data = NULL; |
4f7f46d3 AH |
1522 | mutex_unlock(&vq->mutex); |
1523 | } | |
1524 | } | |
1525 | /* | |
1526 | * Act as synchronize_rcu to make sure access to | |
1527 | * old vs->vs_tpg is finished. | |
1528 | */ | |
1529 | vhost_scsi_flush(vs); | |
1530 | kfree(vs->vs_tpg); | |
1531 | vs->vs_tpg = NULL; | |
a6c9af87 | 1532 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1533 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1534 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 1535 | return 0; |
101998f6 | 1536 | |
038e0af4 | 1537 | err_tpg: |
98718312 | 1538 | mutex_unlock(&tpg->tv_tpg_mutex); |
038e0af4 | 1539 | err_dev: |
101998f6 | 1540 | mutex_unlock(&vs->dev.mutex); |
1a1ff825 | 1541 | mutex_unlock(&vhost_scsi_mutex); |
101998f6 | 1542 | return ret; |
057cbf49 NB |
1543 | } |
1544 | ||
4f7f46d3 AH |
1545 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1546 | { | |
ea16c514 MT |
1547 | struct vhost_virtqueue *vq; |
1548 | int i; | |
1549 | ||
4f7f46d3 AH |
1550 | if (features & ~VHOST_SCSI_FEATURES) |
1551 | return -EOPNOTSUPP; | |
1552 | ||
1553 | mutex_lock(&vs->dev.mutex); | |
1554 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1555 | !vhost_log_access_ok(&vs->dev)) { | |
1556 | mutex_unlock(&vs->dev.mutex); | |
1557 | return -EFAULT; | |
1558 | } | |
ea16c514 MT |
1559 | |
1560 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
1561 | vq = &vs->vqs[i].vq; | |
1562 | mutex_lock(&vq->mutex); | |
1563 | vq->acked_features = features; | |
1564 | mutex_unlock(&vq->mutex); | |
1565 | } | |
4f7f46d3 AH |
1566 | mutex_unlock(&vs->dev.mutex); |
1567 | return 0; | |
1568 | } | |
1569 | ||
057cbf49 NB |
1570 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1571 | { | |
c7289312 | 1572 | struct vhost_scsi *vs; |
3ab2e420 | 1573 | struct vhost_virtqueue **vqs; |
595cb754 | 1574 | int r = -ENOMEM, i; |
057cbf49 | 1575 | |
595cb754 MT |
1576 | vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
1577 | if (!vs) { | |
1578 | vs = vzalloc(sizeof(*vs)); | |
1579 | if (!vs) | |
1580 | goto err_vs; | |
1581 | } | |
057cbf49 | 1582 | |
3ab2e420 | 1583 | vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL); |
595cb754 MT |
1584 | if (!vqs) |
1585 | goto err_vqs; | |
3ab2e420 | 1586 | |
c7289312 | 1587 | vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); |
1a1ff825 | 1588 | vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work); |
a6c9af87 | 1589 | |
c7289312 AH |
1590 | vs->vs_events_nr = 0; |
1591 | vs->vs_events_missed = false; | |
057cbf49 | 1592 | |
c7289312 AH |
1593 | vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; |
1594 | vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1595 | vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1596 | vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
3ab2e420 | 1597 | for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { |
c7289312 AH |
1598 | vqs[i] = &vs->vqs[i].vq; |
1599 | vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
3ab2e420 | 1600 | } |
59566b6e | 1601 | vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ); |
f2f0173d | 1602 | |
1a1ff825 | 1603 | vhost_scsi_init_inflight(vs, NULL); |
f2f0173d | 1604 | |
c7289312 | 1605 | f->private_data = vs; |
057cbf49 | 1606 | return 0; |
595cb754 | 1607 | |
595cb754 | 1608 | err_vqs: |
68404441 | 1609 | kvfree(vs); |
595cb754 MT |
1610 | err_vs: |
1611 | return r; | |
057cbf49 NB |
1612 | } |
1613 | ||
1614 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1615 | { | |
c7289312 | 1616 | struct vhost_scsi *vs = f->private_data; |
67e18cf9 | 1617 | struct vhost_scsi_target t; |
057cbf49 | 1618 | |
c7289312 AH |
1619 | mutex_lock(&vs->dev.mutex); |
1620 | memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1621 | mutex_unlock(&vs->dev.mutex); | |
1622 | vhost_scsi_clear_endpoint(vs, &t); | |
1623 | vhost_dev_stop(&vs->dev); | |
1624 | vhost_dev_cleanup(&vs->dev, false); | |
a6c9af87 | 1625 | /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
c7289312 AH |
1626 | vhost_scsi_flush(vs); |
1627 | kfree(vs->dev.vqs); | |
68404441 | 1628 | kvfree(vs); |
057cbf49 NB |
1629 | return 0; |
1630 | } | |
1631 | ||
683bd967 AH |
1632 | static long |
1633 | vhost_scsi_ioctl(struct file *f, | |
1634 | unsigned int ioctl, | |
1635 | unsigned long arg) | |
057cbf49 NB |
1636 | { |
1637 | struct vhost_scsi *vs = f->private_data; | |
1638 | struct vhost_scsi_target backend; | |
1639 | void __user *argp = (void __user *)arg; | |
1640 | u64 __user *featurep = argp; | |
11c63418 AH |
1641 | u32 __user *eventsp = argp; |
1642 | u32 events_missed; | |
057cbf49 | 1643 | u64 features; |
101998f6 | 1644 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1645 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1646 | |
1647 | switch (ioctl) { | |
1648 | case VHOST_SCSI_SET_ENDPOINT: | |
1649 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1650 | return -EFAULT; | |
6de7145c MT |
1651 | if (backend.reserved != 0) |
1652 | return -EOPNOTSUPP; | |
057cbf49 NB |
1653 | |
1654 | return vhost_scsi_set_endpoint(vs, &backend); | |
1655 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1656 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1657 | return -EFAULT; | |
6de7145c MT |
1658 | if (backend.reserved != 0) |
1659 | return -EOPNOTSUPP; | |
057cbf49 NB |
1660 | |
1661 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1662 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1663 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1664 | return -EFAULT; |
1665 | return 0; | |
11c63418 AH |
1666 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1667 | if (get_user(events_missed, eventsp)) | |
1668 | return -EFAULT; | |
1669 | mutex_lock(&vq->mutex); | |
1670 | vs->vs_events_missed = events_missed; | |
1671 | mutex_unlock(&vq->mutex); | |
1672 | return 0; | |
1673 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1674 | mutex_lock(&vq->mutex); | |
1675 | events_missed = vs->vs_events_missed; | |
1676 | mutex_unlock(&vq->mutex); | |
1677 | if (put_user(events_missed, eventsp)) | |
1678 | return -EFAULT; | |
1679 | return 0; | |
057cbf49 | 1680 | case VHOST_GET_FEATURES: |
5dade710 | 1681 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1682 | if (copy_to_user(featurep, &features, sizeof features)) |
1683 | return -EFAULT; | |
1684 | return 0; | |
1685 | case VHOST_SET_FEATURES: | |
1686 | if (copy_from_user(&features, featurep, sizeof features)) | |
1687 | return -EFAULT; | |
1688 | return vhost_scsi_set_features(vs, features); | |
1689 | default: | |
1690 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1691 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1692 | /* TODO: flush backend after dev ioctl. */ | |
1693 | if (r == -ENOIOCTLCMD) | |
1694 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1695 | mutex_unlock(&vs->dev.mutex); |
1696 | return r; | |
1697 | } | |
1698 | } | |
1699 | ||
101998f6 NB |
1700 | #ifdef CONFIG_COMPAT |
1701 | static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, | |
1702 | unsigned long arg) | |
1703 | { | |
1704 | return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1705 | } | |
1706 | #endif | |
1707 | ||
057cbf49 NB |
1708 | static const struct file_operations vhost_scsi_fops = { |
1709 | .owner = THIS_MODULE, | |
1710 | .release = vhost_scsi_release, | |
1711 | .unlocked_ioctl = vhost_scsi_ioctl, | |
101998f6 NB |
1712 | #ifdef CONFIG_COMPAT |
1713 | .compat_ioctl = vhost_scsi_compat_ioctl, | |
1714 | #endif | |
057cbf49 NB |
1715 | .open = vhost_scsi_open, |
1716 | .llseek = noop_llseek, | |
1717 | }; | |
1718 | ||
1719 | static struct miscdevice vhost_scsi_misc = { | |
1720 | MISC_DYNAMIC_MINOR, | |
1721 | "vhost-scsi", | |
1722 | &vhost_scsi_fops, | |
1723 | }; | |
1724 | ||
1725 | static int __init vhost_scsi_register(void) | |
1726 | { | |
1727 | return misc_register(&vhost_scsi_misc); | |
1728 | } | |
1729 | ||
1730 | static int vhost_scsi_deregister(void) | |
1731 | { | |
1732 | return misc_deregister(&vhost_scsi_misc); | |
1733 | } | |
1734 | ||
1a1ff825 | 1735 | static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport) |
057cbf49 NB |
1736 | { |
1737 | switch (tport->tport_proto_id) { | |
1738 | case SCSI_PROTOCOL_SAS: | |
1739 | return "SAS"; | |
1740 | case SCSI_PROTOCOL_FCP: | |
1741 | return "FCP"; | |
1742 | case SCSI_PROTOCOL_ISCSI: | |
1743 | return "iSCSI"; | |
1744 | default: | |
1745 | break; | |
1746 | } | |
1747 | ||
1748 | return "Unknown"; | |
1749 | } | |
1750 | ||
683bd967 | 1751 | static void |
1a1ff825 | 1752 | vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg, |
683bd967 | 1753 | struct se_lun *lun, bool plug) |
a6c9af87 AH |
1754 | { |
1755 | ||
1756 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1757 | struct vhost_virtqueue *vq; | |
1758 | u32 reason; | |
1759 | ||
1760 | if (!vs) | |
1761 | return; | |
1762 | ||
1763 | mutex_lock(&vs->dev.mutex); | |
a6c9af87 AH |
1764 | |
1765 | if (plug) | |
1766 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1767 | else | |
1768 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1769 | ||
3ab2e420 | 1770 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 | 1771 | mutex_lock(&vq->mutex); |
ea16c514 | 1772 | if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG)) |
1a1ff825 | 1773 | vhost_scsi_send_evt(vs, tpg, lun, |
ea16c514 | 1774 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); |
a6c9af87 AH |
1775 | mutex_unlock(&vq->mutex); |
1776 | mutex_unlock(&vs->dev.mutex); | |
1777 | } | |
1778 | ||
1a1ff825 | 1779 | static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1780 | { |
1a1ff825 | 1781 | vhost_scsi_do_plug(tpg, lun, true); |
a6c9af87 AH |
1782 | } |
1783 | ||
1a1ff825 | 1784 | static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
a6c9af87 | 1785 | { |
1a1ff825 | 1786 | vhost_scsi_do_plug(tpg, lun, false); |
a6c9af87 AH |
1787 | } |
1788 | ||
1a1ff825 | 1789 | static int vhost_scsi_port_link(struct se_portal_group *se_tpg, |
683bd967 | 1790 | struct se_lun *lun) |
057cbf49 | 1791 | { |
1a1ff825 NB |
1792 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1793 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1794 | |
1a1ff825 | 1795 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1796 | |
98718312 AH |
1797 | mutex_lock(&tpg->tv_tpg_mutex); |
1798 | tpg->tv_tpg_port_count++; | |
1799 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 | 1800 | |
1a1ff825 | 1801 | vhost_scsi_hotplug(tpg, lun); |
a6c9af87 | 1802 | |
1a1ff825 | 1803 | mutex_unlock(&vhost_scsi_mutex); |
a6c9af87 | 1804 | |
057cbf49 NB |
1805 | return 0; |
1806 | } | |
1807 | ||
1a1ff825 | 1808 | static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg, |
683bd967 | 1809 | struct se_lun *lun) |
057cbf49 | 1810 | { |
1a1ff825 NB |
1811 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
1812 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 1813 | |
1a1ff825 | 1814 | mutex_lock(&vhost_scsi_mutex); |
a6c9af87 | 1815 | |
98718312 AH |
1816 | mutex_lock(&tpg->tv_tpg_mutex); |
1817 | tpg->tv_tpg_port_count--; | |
1818 | mutex_unlock(&tpg->tv_tpg_mutex); | |
a6c9af87 | 1819 | |
1a1ff825 | 1820 | vhost_scsi_hotunplug(tpg, lun); |
a6c9af87 | 1821 | |
1a1ff825 | 1822 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 NB |
1823 | } |
1824 | ||
683bd967 | 1825 | static struct se_node_acl * |
1a1ff825 | 1826 | vhost_scsi_make_nodeacl(struct se_portal_group *se_tpg, |
683bd967 AH |
1827 | struct config_group *group, |
1828 | const char *name) | |
057cbf49 NB |
1829 | { |
1830 | struct se_node_acl *se_nacl, *se_nacl_new; | |
1a1ff825 | 1831 | struct vhost_scsi_nacl *nacl; |
057cbf49 NB |
1832 | u64 wwpn = 0; |
1833 | u32 nexus_depth; | |
1834 | ||
1a1ff825 | 1835 | /* vhost_scsi_parse_wwn(name, &wwpn, 1) < 0) |
057cbf49 | 1836 | return ERR_PTR(-EINVAL); */ |
1a1ff825 | 1837 | se_nacl_new = vhost_scsi_alloc_fabric_acl(se_tpg); |
057cbf49 NB |
1838 | if (!se_nacl_new) |
1839 | return ERR_PTR(-ENOMEM); | |
1840 | ||
1841 | nexus_depth = 1; | |
1842 | /* | |
1843 | * se_nacl_new may be released by core_tpg_add_initiator_node_acl() | |
1844 | * when converting a NodeACL from demo mode -> explict | |
1845 | */ | |
1846 | se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new, | |
1847 | name, nexus_depth); | |
1848 | if (IS_ERR(se_nacl)) { | |
1a1ff825 | 1849 | vhost_scsi_release_fabric_acl(se_tpg, se_nacl_new); |
057cbf49 NB |
1850 | return se_nacl; |
1851 | } | |
1852 | /* | |
1a1ff825 | 1853 | * Locate our struct vhost_scsi_nacl and set the FC Nport WWPN |
057cbf49 | 1854 | */ |
1a1ff825 | 1855 | nacl = container_of(se_nacl, struct vhost_scsi_nacl, se_node_acl); |
057cbf49 NB |
1856 | nacl->iport_wwpn = wwpn; |
1857 | ||
1858 | return se_nacl; | |
1859 | } | |
1860 | ||
1a1ff825 | 1861 | static void vhost_scsi_drop_nodeacl(struct se_node_acl *se_acl) |
057cbf49 | 1862 | { |
1a1ff825 NB |
1863 | struct vhost_scsi_nacl *nacl = container_of(se_acl, |
1864 | struct vhost_scsi_nacl, se_node_acl); | |
057cbf49 NB |
1865 | core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1); |
1866 | kfree(nacl); | |
1867 | } | |
1868 | ||
1a1ff825 | 1869 | static void vhost_scsi_free_cmd_map_res(struct vhost_scsi_nexus *nexus, |
3aee26b4 NB |
1870 | struct se_session *se_sess) |
1871 | { | |
1a1ff825 | 1872 | struct vhost_scsi_cmd *tv_cmd; |
3aee26b4 NB |
1873 | unsigned int i; |
1874 | ||
1875 | if (!se_sess->sess_cmd_map) | |
1876 | return; | |
1877 | ||
1a1ff825 NB |
1878 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1879 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 NB |
1880 | |
1881 | kfree(tv_cmd->tvc_sgl); | |
b1935f68 | 1882 | kfree(tv_cmd->tvc_prot_sgl); |
3aee26b4 NB |
1883 | kfree(tv_cmd->tvc_upages); |
1884 | } | |
1885 | } | |
1886 | ||
b1d75fe5 NB |
1887 | static ssize_t vhost_scsi_tpg_attrib_store_fabric_prot_type( |
1888 | struct se_portal_group *se_tpg, | |
1889 | const char *page, | |
1890 | size_t count) | |
1891 | { | |
1892 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, | |
1893 | struct vhost_scsi_tpg, se_tpg); | |
1894 | unsigned long val; | |
1895 | int ret = kstrtoul(page, 0, &val); | |
1896 | ||
1897 | if (ret) { | |
1898 | pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); | |
1899 | return ret; | |
1900 | } | |
1901 | if (val != 0 && val != 1 && val != 3) { | |
1902 | pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val); | |
1903 | return -EINVAL; | |
1904 | } | |
1905 | tpg->tv_fabric_prot_type = val; | |
1906 | ||
1907 | return count; | |
1908 | } | |
1909 | ||
1910 | static ssize_t vhost_scsi_tpg_attrib_show_fabric_prot_type( | |
1911 | struct se_portal_group *se_tpg, | |
1912 | char *page) | |
1913 | { | |
1914 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, | |
1915 | struct vhost_scsi_tpg, se_tpg); | |
1916 | ||
1917 | return sprintf(page, "%d\n", tpg->tv_fabric_prot_type); | |
1918 | } | |
1919 | TF_TPG_ATTRIB_ATTR(vhost_scsi, fabric_prot_type, S_IRUGO | S_IWUSR); | |
1920 | ||
1921 | static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = { | |
1922 | &vhost_scsi_tpg_attrib_fabric_prot_type.attr, | |
1923 | NULL, | |
1924 | }; | |
1925 | ||
1a1ff825 | 1926 | static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg, |
683bd967 | 1927 | const char *name) |
057cbf49 NB |
1928 | { |
1929 | struct se_portal_group *se_tpg; | |
3aee26b4 | 1930 | struct se_session *se_sess; |
1a1ff825 NB |
1931 | struct vhost_scsi_nexus *tv_nexus; |
1932 | struct vhost_scsi_cmd *tv_cmd; | |
3aee26b4 | 1933 | unsigned int i; |
057cbf49 | 1934 | |
98718312 AH |
1935 | mutex_lock(&tpg->tv_tpg_mutex); |
1936 | if (tpg->tpg_nexus) { | |
1937 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1938 | pr_debug("tpg->tpg_nexus already exists\n"); | |
057cbf49 NB |
1939 | return -EEXIST; |
1940 | } | |
98718312 | 1941 | se_tpg = &tpg->se_tpg; |
057cbf49 | 1942 | |
1a1ff825 | 1943 | tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL); |
057cbf49 | 1944 | if (!tv_nexus) { |
98718312 | 1945 | mutex_unlock(&tpg->tv_tpg_mutex); |
1a1ff825 | 1946 | pr_err("Unable to allocate struct vhost_scsi_nexus\n"); |
057cbf49 NB |
1947 | return -ENOMEM; |
1948 | } | |
1949 | /* | |
4824d3bf | 1950 | * Initialize the struct se_session pointer and setup tagpool |
1a1ff825 | 1951 | * for struct vhost_scsi_cmd descriptors |
057cbf49 | 1952 | */ |
4824d3bf | 1953 | tv_nexus->tvn_se_sess = transport_init_session_tags( |
1a1ff825 NB |
1954 | VHOST_SCSI_DEFAULT_TAGS, |
1955 | sizeof(struct vhost_scsi_cmd), | |
95e7c434 | 1956 | TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS); |
057cbf49 | 1957 | if (IS_ERR(tv_nexus->tvn_se_sess)) { |
98718312 | 1958 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1959 | kfree(tv_nexus); |
1960 | return -ENOMEM; | |
1961 | } | |
3aee26b4 | 1962 | se_sess = tv_nexus->tvn_se_sess; |
1a1ff825 NB |
1963 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
1964 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; | |
3aee26b4 NB |
1965 | |
1966 | tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) * | |
1a1ff825 | 1967 | VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL); |
3aee26b4 NB |
1968 | if (!tv_cmd->tvc_sgl) { |
1969 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1970 | pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); | |
1971 | goto out; | |
1972 | } | |
1973 | ||
1974 | tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) * | |
1a1ff825 | 1975 | VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL); |
3aee26b4 NB |
1976 | if (!tv_cmd->tvc_upages) { |
1977 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1978 | pr_err("Unable to allocate tv_cmd->tvc_upages\n"); | |
1979 | goto out; | |
1980 | } | |
b1935f68 NB |
1981 | |
1982 | tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) * | |
1a1ff825 | 1983 | VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL); |
b1935f68 NB |
1984 | if (!tv_cmd->tvc_prot_sgl) { |
1985 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1986 | pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); | |
1987 | goto out; | |
1988 | } | |
3aee26b4 | 1989 | } |
057cbf49 NB |
1990 | /* |
1991 | * Since we are running in 'demo mode' this call with generate a | |
1a1ff825 | 1992 | * struct se_node_acl for the vhost_scsi struct se_portal_group with |
057cbf49 NB |
1993 | * the SCSI Initiator port name of the passed configfs group 'name'. |
1994 | */ | |
1995 | tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
1996 | se_tpg, (unsigned char *)name); | |
1997 | if (!tv_nexus->tvn_se_sess->se_node_acl) { | |
98718312 | 1998 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1999 | pr_debug("core_tpg_check_initiator_node_acl() failed" |
2000 | " for %s\n", name); | |
3aee26b4 | 2001 | goto out; |
057cbf49 NB |
2002 | } |
2003 | /* | |
2f450cc1 | 2004 | * Now register the TCM vhost virtual I_T Nexus as active. |
057cbf49 | 2005 | */ |
2f450cc1 | 2006 | transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl, |
057cbf49 | 2007 | tv_nexus->tvn_se_sess, tv_nexus); |
98718312 | 2008 | tpg->tpg_nexus = tv_nexus; |
057cbf49 | 2009 | |
98718312 | 2010 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 2011 | return 0; |
3aee26b4 NB |
2012 | |
2013 | out: | |
1a1ff825 | 2014 | vhost_scsi_free_cmd_map_res(tv_nexus, se_sess); |
3aee26b4 NB |
2015 | transport_free_session(se_sess); |
2016 | kfree(tv_nexus); | |
2017 | return -ENOMEM; | |
057cbf49 NB |
2018 | } |
2019 | ||
1a1ff825 | 2020 | static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg) |
057cbf49 NB |
2021 | { |
2022 | struct se_session *se_sess; | |
1a1ff825 | 2023 | struct vhost_scsi_nexus *tv_nexus; |
057cbf49 NB |
2024 | |
2025 | mutex_lock(&tpg->tv_tpg_mutex); | |
2026 | tv_nexus = tpg->tpg_nexus; | |
2027 | if (!tv_nexus) { | |
2028 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2029 | return -ENODEV; | |
2030 | } | |
2031 | ||
2032 | se_sess = tv_nexus->tvn_se_sess; | |
2033 | if (!se_sess) { | |
2034 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2035 | return -ENODEV; | |
2036 | } | |
2037 | ||
101998f6 | 2038 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 2039 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 2040 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 2041 | " active TPG port count: %d\n", |
101998f6 NB |
2042 | tpg->tv_tpg_port_count); |
2043 | return -EBUSY; | |
057cbf49 NB |
2044 | } |
2045 | ||
101998f6 | 2046 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 2047 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 2048 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 2049 | " active TPG vhost count: %d\n", |
101998f6 NB |
2050 | tpg->tv_tpg_vhost_count); |
2051 | return -EBUSY; | |
057cbf49 NB |
2052 | } |
2053 | ||
101998f6 | 2054 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
1a1ff825 | 2055 | " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport), |
057cbf49 | 2056 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
3aee26b4 | 2057 | |
1a1ff825 | 2058 | vhost_scsi_free_cmd_map_res(tv_nexus, se_sess); |
057cbf49 | 2059 | /* |
101998f6 | 2060 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 NB |
2061 | */ |
2062 | transport_deregister_session(tv_nexus->tvn_se_sess); | |
2063 | tpg->tpg_nexus = NULL; | |
2064 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2065 | ||
2066 | kfree(tv_nexus); | |
2067 | return 0; | |
2068 | } | |
2069 | ||
1a1ff825 | 2070 | static ssize_t vhost_scsi_tpg_show_nexus(struct se_portal_group *se_tpg, |
683bd967 | 2071 | char *page) |
057cbf49 | 2072 | { |
1a1ff825 NB |
2073 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2074 | struct vhost_scsi_tpg, se_tpg); | |
2075 | struct vhost_scsi_nexus *tv_nexus; | |
057cbf49 NB |
2076 | ssize_t ret; |
2077 | ||
98718312 AH |
2078 | mutex_lock(&tpg->tv_tpg_mutex); |
2079 | tv_nexus = tpg->tpg_nexus; | |
057cbf49 | 2080 | if (!tv_nexus) { |
98718312 | 2081 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2082 | return -ENODEV; |
2083 | } | |
2084 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
2085 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
98718312 | 2086 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2087 | |
2088 | return ret; | |
2089 | } | |
2090 | ||
1a1ff825 | 2091 | static ssize_t vhost_scsi_tpg_store_nexus(struct se_portal_group *se_tpg, |
683bd967 AH |
2092 | const char *page, |
2093 | size_t count) | |
057cbf49 | 2094 | { |
1a1ff825 NB |
2095 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2096 | struct vhost_scsi_tpg, se_tpg); | |
2097 | struct vhost_scsi_tport *tport_wwn = tpg->tport; | |
2098 | unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr; | |
057cbf49 NB |
2099 | int ret; |
2100 | /* | |
2101 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
2102 | */ | |
2103 | if (!strncmp(page, "NULL", 4)) { | |
1a1ff825 | 2104 | ret = vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
2105 | return (!ret) ? count : ret; |
2106 | } | |
2107 | /* | |
2108 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1a1ff825 NB |
2109 | * the fabric protocol_id set in vhost_scsi_make_tport(), and call |
2110 | * vhost_scsi_make_nexus(). | |
057cbf49 | 2111 | */ |
1a1ff825 | 2112 | if (strlen(page) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2113 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
1a1ff825 | 2114 | " max: %d\n", page, VHOST_SCSI_NAMELEN); |
057cbf49 NB |
2115 | return -EINVAL; |
2116 | } | |
1a1ff825 | 2117 | snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page); |
057cbf49 NB |
2118 | |
2119 | ptr = strstr(i_port, "naa."); | |
2120 | if (ptr) { | |
2121 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
2122 | pr_err("Passed SAS Initiator Port %s does not" | |
2123 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2124 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2125 | return -EINVAL; |
2126 | } | |
2127 | port_ptr = &i_port[0]; | |
2128 | goto check_newline; | |
2129 | } | |
2130 | ptr = strstr(i_port, "fc."); | |
2131 | if (ptr) { | |
2132 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
2133 | pr_err("Passed FCP Initiator Port %s does not" | |
2134 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2135 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2136 | return -EINVAL; |
2137 | } | |
2138 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
2139 | goto check_newline; | |
2140 | } | |
2141 | ptr = strstr(i_port, "iqn."); | |
2142 | if (ptr) { | |
2143 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
2144 | pr_err("Passed iSCSI Initiator Port %s does not" | |
2145 | " match target port protoid: %s\n", i_port, | |
1a1ff825 | 2146 | vhost_scsi_dump_proto_id(tport_wwn)); |
057cbf49 NB |
2147 | return -EINVAL; |
2148 | } | |
2149 | port_ptr = &i_port[0]; | |
2150 | goto check_newline; | |
2151 | } | |
2152 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
2153 | " %s\n", i_port); | |
2154 | return -EINVAL; | |
2155 | /* | |
2156 | * Clear any trailing newline for the NAA WWN | |
2157 | */ | |
2158 | check_newline: | |
2159 | if (i_port[strlen(i_port)-1] == '\n') | |
2160 | i_port[strlen(i_port)-1] = '\0'; | |
2161 | ||
1a1ff825 | 2162 | ret = vhost_scsi_make_nexus(tpg, port_ptr); |
057cbf49 NB |
2163 | if (ret < 0) |
2164 | return ret; | |
2165 | ||
2166 | return count; | |
2167 | } | |
2168 | ||
1a1ff825 | 2169 | TF_TPG_BASE_ATTR(vhost_scsi, nexus, S_IRUGO | S_IWUSR); |
057cbf49 | 2170 | |
1a1ff825 NB |
2171 | static struct configfs_attribute *vhost_scsi_tpg_attrs[] = { |
2172 | &vhost_scsi_tpg_nexus.attr, | |
057cbf49 NB |
2173 | NULL, |
2174 | }; | |
2175 | ||
683bd967 | 2176 | static struct se_portal_group * |
1a1ff825 | 2177 | vhost_scsi_make_tpg(struct se_wwn *wwn, |
683bd967 AH |
2178 | struct config_group *group, |
2179 | const char *name) | |
057cbf49 | 2180 | { |
1a1ff825 NB |
2181 | struct vhost_scsi_tport *tport = container_of(wwn, |
2182 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 | 2183 | |
1a1ff825 | 2184 | struct vhost_scsi_tpg *tpg; |
59c816c1 | 2185 | u16 tpgt; |
057cbf49 NB |
2186 | int ret; |
2187 | ||
2188 | if (strstr(name, "tpgt_") != name) | |
2189 | return ERR_PTR(-EINVAL); | |
59c816c1 | 2190 | if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET) |
057cbf49 NB |
2191 | return ERR_PTR(-EINVAL); |
2192 | ||
1a1ff825 | 2193 | tpg = kzalloc(sizeof(struct vhost_scsi_tpg), GFP_KERNEL); |
057cbf49 | 2194 | if (!tpg) { |
1a1ff825 | 2195 | pr_err("Unable to allocate struct vhost_scsi_tpg"); |
057cbf49 NB |
2196 | return ERR_PTR(-ENOMEM); |
2197 | } | |
2198 | mutex_init(&tpg->tv_tpg_mutex); | |
2199 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
2200 | tpg->tport = tport; | |
2201 | tpg->tport_tpgt = tpgt; | |
2202 | ||
9ac8928e | 2203 | ret = core_tpg_register(&vhost_scsi_ops, wwn, |
057cbf49 NB |
2204 | &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL); |
2205 | if (ret < 0) { | |
2206 | kfree(tpg); | |
2207 | return NULL; | |
2208 | } | |
1a1ff825 NB |
2209 | mutex_lock(&vhost_scsi_mutex); |
2210 | list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list); | |
2211 | mutex_unlock(&vhost_scsi_mutex); | |
057cbf49 NB |
2212 | |
2213 | return &tpg->se_tpg; | |
2214 | } | |
2215 | ||
1a1ff825 | 2216 | static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg) |
057cbf49 | 2217 | { |
1a1ff825 NB |
2218 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
2219 | struct vhost_scsi_tpg, se_tpg); | |
057cbf49 | 2220 | |
1a1ff825 | 2221 | mutex_lock(&vhost_scsi_mutex); |
057cbf49 | 2222 | list_del(&tpg->tv_tpg_list); |
1a1ff825 | 2223 | mutex_unlock(&vhost_scsi_mutex); |
057cbf49 | 2224 | /* |
101998f6 | 2225 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 | 2226 | */ |
1a1ff825 | 2227 | vhost_scsi_drop_nexus(tpg); |
057cbf49 NB |
2228 | /* |
2229 | * Deregister the se_tpg from TCM.. | |
2230 | */ | |
2231 | core_tpg_deregister(se_tpg); | |
2232 | kfree(tpg); | |
2233 | } | |
2234 | ||
683bd967 | 2235 | static struct se_wwn * |
1a1ff825 | 2236 | vhost_scsi_make_tport(struct target_fabric_configfs *tf, |
683bd967 AH |
2237 | struct config_group *group, |
2238 | const char *name) | |
057cbf49 | 2239 | { |
1a1ff825 | 2240 | struct vhost_scsi_tport *tport; |
057cbf49 NB |
2241 | char *ptr; |
2242 | u64 wwpn = 0; | |
2243 | int off = 0; | |
2244 | ||
1a1ff825 | 2245 | /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0) |
057cbf49 NB |
2246 | return ERR_PTR(-EINVAL); */ |
2247 | ||
1a1ff825 | 2248 | tport = kzalloc(sizeof(struct vhost_scsi_tport), GFP_KERNEL); |
057cbf49 | 2249 | if (!tport) { |
1a1ff825 | 2250 | pr_err("Unable to allocate struct vhost_scsi_tport"); |
057cbf49 NB |
2251 | return ERR_PTR(-ENOMEM); |
2252 | } | |
2253 | tport->tport_wwpn = wwpn; | |
2254 | /* | |
2255 | * Determine the emulated Protocol Identifier and Target Port Name | |
2256 | * based on the incoming configfs directory name. | |
2257 | */ | |
2258 | ptr = strstr(name, "naa."); | |
2259 | if (ptr) { | |
2260 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
2261 | goto check_len; | |
2262 | } | |
2263 | ptr = strstr(name, "fc."); | |
2264 | if (ptr) { | |
2265 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
2266 | off = 3; /* Skip over "fc." */ | |
2267 | goto check_len; | |
2268 | } | |
2269 | ptr = strstr(name, "iqn."); | |
2270 | if (ptr) { | |
2271 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
2272 | goto check_len; | |
2273 | } | |
2274 | ||
2275 | pr_err("Unable to locate prefix for emulated Target Port:" | |
2276 | " %s\n", name); | |
2277 | kfree(tport); | |
2278 | return ERR_PTR(-EINVAL); | |
2279 | ||
2280 | check_len: | |
1a1ff825 | 2281 | if (strlen(name) >= VHOST_SCSI_NAMELEN) { |
057cbf49 | 2282 | pr_err("Emulated %s Address: %s, exceeds" |
1a1ff825 NB |
2283 | " max: %d\n", name, vhost_scsi_dump_proto_id(tport), |
2284 | VHOST_SCSI_NAMELEN); | |
057cbf49 NB |
2285 | kfree(tport); |
2286 | return ERR_PTR(-EINVAL); | |
2287 | } | |
1a1ff825 | 2288 | snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]); |
057cbf49 NB |
2289 | |
2290 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
1a1ff825 | 2291 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name); |
057cbf49 NB |
2292 | |
2293 | return &tport->tport_wwn; | |
2294 | } | |
2295 | ||
1a1ff825 | 2296 | static void vhost_scsi_drop_tport(struct se_wwn *wwn) |
057cbf49 | 2297 | { |
1a1ff825 NB |
2298 | struct vhost_scsi_tport *tport = container_of(wwn, |
2299 | struct vhost_scsi_tport, tport_wwn); | |
057cbf49 NB |
2300 | |
2301 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
1a1ff825 | 2302 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), |
057cbf49 NB |
2303 | tport->tport_name); |
2304 | ||
2305 | kfree(tport); | |
2306 | } | |
2307 | ||
683bd967 | 2308 | static ssize_t |
1a1ff825 | 2309 | vhost_scsi_wwn_show_attr_version(struct target_fabric_configfs *tf, |
683bd967 | 2310 | char *page) |
057cbf49 NB |
2311 | { |
2312 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" | |
1a1ff825 | 2313 | "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 NB |
2314 | utsname()->machine); |
2315 | } | |
2316 | ||
1a1ff825 | 2317 | TF_WWN_ATTR_RO(vhost_scsi, version); |
057cbf49 | 2318 | |
1a1ff825 NB |
2319 | static struct configfs_attribute *vhost_scsi_wwn_attrs[] = { |
2320 | &vhost_scsi_wwn_version.attr, | |
057cbf49 NB |
2321 | NULL, |
2322 | }; | |
2323 | ||
1a1ff825 | 2324 | static struct target_core_fabric_ops vhost_scsi_ops = { |
9ac8928e CH |
2325 | .module = THIS_MODULE, |
2326 | .name = "vhost", | |
1a1ff825 NB |
2327 | .get_fabric_name = vhost_scsi_get_fabric_name, |
2328 | .get_fabric_proto_ident = vhost_scsi_get_fabric_proto_ident, | |
2329 | .tpg_get_wwn = vhost_scsi_get_fabric_wwn, | |
2330 | .tpg_get_tag = vhost_scsi_get_tpgt, | |
2331 | .tpg_get_default_depth = vhost_scsi_get_default_depth, | |
2332 | .tpg_get_pr_transport_id = vhost_scsi_get_pr_transport_id, | |
2333 | .tpg_get_pr_transport_id_len = vhost_scsi_get_pr_transport_id_len, | |
2334 | .tpg_parse_pr_out_transport_id = vhost_scsi_parse_pr_out_transport_id, | |
2335 | .tpg_check_demo_mode = vhost_scsi_check_true, | |
2336 | .tpg_check_demo_mode_cache = vhost_scsi_check_true, | |
2337 | .tpg_check_demo_mode_write_protect = vhost_scsi_check_false, | |
2338 | .tpg_check_prod_mode_write_protect = vhost_scsi_check_false, | |
b1d75fe5 | 2339 | .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only, |
1a1ff825 NB |
2340 | .tpg_alloc_fabric_acl = vhost_scsi_alloc_fabric_acl, |
2341 | .tpg_release_fabric_acl = vhost_scsi_release_fabric_acl, | |
2342 | .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index, | |
2343 | .release_cmd = vhost_scsi_release_cmd, | |
084ed45b | 2344 | .check_stop_free = vhost_scsi_check_stop_free, |
1a1ff825 NB |
2345 | .shutdown_session = vhost_scsi_shutdown_session, |
2346 | .close_session = vhost_scsi_close_session, | |
2347 | .sess_get_index = vhost_scsi_sess_get_index, | |
057cbf49 | 2348 | .sess_get_initiator_sid = NULL, |
1a1ff825 NB |
2349 | .write_pending = vhost_scsi_write_pending, |
2350 | .write_pending_status = vhost_scsi_write_pending_status, | |
2351 | .set_default_node_attributes = vhost_scsi_set_default_node_attrs, | |
2352 | .get_task_tag = vhost_scsi_get_task_tag, | |
2353 | .get_cmd_state = vhost_scsi_get_cmd_state, | |
2354 | .queue_data_in = vhost_scsi_queue_data_in, | |
2355 | .queue_status = vhost_scsi_queue_status, | |
2356 | .queue_tm_rsp = vhost_scsi_queue_tm_rsp, | |
2357 | .aborted_task = vhost_scsi_aborted_task, | |
057cbf49 NB |
2358 | /* |
2359 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
2360 | */ | |
1a1ff825 NB |
2361 | .fabric_make_wwn = vhost_scsi_make_tport, |
2362 | .fabric_drop_wwn = vhost_scsi_drop_tport, | |
2363 | .fabric_make_tpg = vhost_scsi_make_tpg, | |
2364 | .fabric_drop_tpg = vhost_scsi_drop_tpg, | |
2365 | .fabric_post_link = vhost_scsi_port_link, | |
2366 | .fabric_pre_unlink = vhost_scsi_port_unlink, | |
057cbf49 NB |
2367 | .fabric_make_np = NULL, |
2368 | .fabric_drop_np = NULL, | |
1a1ff825 NB |
2369 | .fabric_make_nodeacl = vhost_scsi_make_nodeacl, |
2370 | .fabric_drop_nodeacl = vhost_scsi_drop_nodeacl, | |
9ac8928e CH |
2371 | |
2372 | .tfc_wwn_attrs = vhost_scsi_wwn_attrs, | |
2373 | .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs, | |
2374 | .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs, | |
057cbf49 NB |
2375 | }; |
2376 | ||
9ac8928e | 2377 | static int __init vhost_scsi_init(void) |
057cbf49 | 2378 | { |
9ac8928e | 2379 | int ret = -ENOMEM; |
057cbf49 | 2380 | |
9ac8928e | 2381 | pr_debug("TCM_VHOST fabric module %s on %s/%s" |
1a1ff825 | 2382 | " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
057cbf49 | 2383 | utsname()->machine); |
057cbf49 | 2384 | |
101998f6 NB |
2385 | /* |
2386 | * Use our own dedicated workqueue for submitting I/O into | |
2387 | * target core to avoid contention within system_wq. | |
2388 | */ | |
1a1ff825 NB |
2389 | vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0); |
2390 | if (!vhost_scsi_workqueue) | |
057cbf49 NB |
2391 | goto out; |
2392 | ||
2393 | ret = vhost_scsi_register(); | |
2394 | if (ret < 0) | |
2395 | goto out_destroy_workqueue; | |
2396 | ||
9ac8928e | 2397 | ret = target_register_template(&vhost_scsi_ops); |
057cbf49 NB |
2398 | if (ret < 0) |
2399 | goto out_vhost_scsi_deregister; | |
2400 | ||
2401 | return 0; | |
2402 | ||
2403 | out_vhost_scsi_deregister: | |
2404 | vhost_scsi_deregister(); | |
2405 | out_destroy_workqueue: | |
1a1ff825 | 2406 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2407 | out: |
2408 | return ret; | |
2409 | }; | |
2410 | ||
1a1ff825 | 2411 | static void vhost_scsi_exit(void) |
057cbf49 | 2412 | { |
9ac8928e | 2413 | target_unregister_template(&vhost_scsi_ops); |
057cbf49 | 2414 | vhost_scsi_deregister(); |
1a1ff825 | 2415 | destroy_workqueue(vhost_scsi_workqueue); |
057cbf49 NB |
2416 | }; |
2417 | ||
181c04a3 MT |
2418 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
2419 | MODULE_ALIAS("tcm_vhost"); | |
057cbf49 | 2420 | MODULE_LICENSE("GPL"); |
1a1ff825 NB |
2421 | module_init(vhost_scsi_init); |
2422 | module_exit(vhost_scsi_exit); |