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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 MT |
53 | |
54 | #define TCM_VHOST_VERSION "v0.1" | |
55 | #define TCM_VHOST_NAMELEN 256 | |
56 | #define TCM_VHOST_MAX_CDB_SIZE 32 | |
4824d3bf | 57 | #define TCM_VHOST_DEFAULT_TAGS 256 |
3aee26b4 | 58 | #define TCM_VHOST_PREALLOC_SGLS 2048 |
5a01d082 | 59 | #define TCM_VHOST_PREALLOC_UPAGES 2048 |
b1935f68 | 60 | #define TCM_VHOST_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 | ||
69 | struct tcm_vhost_cmd { | |
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; |
5012a3a3 MT |
85 | /* Saved unpacked SCSI LUN for tcm_vhost_submission_work() */ |
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 */ | |
98 | struct tcm_vhost_nexus *tvc_nexus; | |
99 | /* The TCM I/O descriptor that is accessed via container_of() */ | |
100 | struct se_cmd tvc_se_cmd; | |
101 | /* work item used for cmwq dispatch to tcm_vhost_submission_work() */ | |
102 | struct work_struct work; | |
103 | /* Copy of the incoming SCSI command descriptor block (CDB) */ | |
104 | unsigned char tvc_cdb[TCM_VHOST_MAX_CDB_SIZE]; | |
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 | ||
113 | struct tcm_vhost_nexus { | |
114 | /* Pointer to TCM session for I_T Nexus */ | |
115 | struct se_session *tvn_se_sess; | |
116 | }; | |
117 | ||
118 | struct tcm_vhost_nacl { | |
119 | /* Binary World Wide unique Port Name for Vhost Initiator port */ | |
120 | u64 iport_wwpn; | |
121 | /* ASCII formatted WWPN for Sas Initiator port */ | |
122 | char iport_name[TCM_VHOST_NAMELEN]; | |
123 | /* Returned by tcm_vhost_make_nodeacl() */ | |
124 | struct se_node_acl se_node_acl; | |
125 | }; | |
126 | ||
5012a3a3 MT |
127 | struct tcm_vhost_tpg { |
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; | |
134 | /* list for tcm_vhost_list */ | |
135 | struct list_head tv_tpg_list; | |
136 | /* Used to protect access for tpg_nexus */ | |
137 | struct mutex tv_tpg_mutex; | |
138 | /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */ | |
139 | struct tcm_vhost_nexus *tpg_nexus; | |
140 | /* Pointer back to tcm_vhost_tport */ | |
141 | struct tcm_vhost_tport *tport; | |
142 | /* Returned by tcm_vhost_make_tpg() */ | |
143 | struct se_portal_group se_tpg; | |
144 | /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */ | |
145 | struct vhost_scsi *vhost_scsi; | |
146 | }; | |
147 | ||
148 | struct tcm_vhost_tport { | |
149 | /* SCSI protocol the tport is providing */ | |
150 | u8 tport_proto_id; | |
151 | /* Binary World Wide unique Port Name for Vhost Target port */ | |
152 | u64 tport_wwpn; | |
153 | /* ASCII formatted WWPN for Vhost Target port */ | |
154 | char tport_name[TCM_VHOST_NAMELEN]; | |
155 | /* Returned by tcm_vhost_make_tport() */ | |
156 | struct se_wwn tport_wwn; | |
157 | }; | |
158 | ||
159 | struct tcm_vhost_evt { | |
160 | /* event to be sent to guest */ | |
161 | struct virtio_scsi_event event; | |
162 | /* event list, serviced from vhost worker thread */ | |
163 | struct llist_node list; | |
164 | }; | |
057cbf49 | 165 | |
101998f6 NB |
166 | enum { |
167 | VHOST_SCSI_VQ_CTL = 0, | |
168 | VHOST_SCSI_VQ_EVT = 1, | |
169 | VHOST_SCSI_VQ_IO = 2, | |
170 | }; | |
171 | ||
e72fd72e | 172 | /* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */ |
5dade710 | 173 | enum { |
95e7c434 | 174 | VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) | |
664ed90e NB |
175 | (1ULL << VIRTIO_SCSI_F_T10_PI) | |
176 | (1ULL << VIRTIO_F_ANY_LAYOUT) | | |
177 | (1ULL << VIRTIO_F_VERSION_1) | |
5dade710 NB |
178 | }; |
179 | ||
1b7f390e AH |
180 | #define VHOST_SCSI_MAX_TARGET 256 |
181 | #define VHOST_SCSI_MAX_VQ 128 | |
a6c9af87 | 182 | #define VHOST_SCSI_MAX_EVENT 128 |
67e18cf9 | 183 | |
3ab2e420 AH |
184 | struct vhost_scsi_virtqueue { |
185 | struct vhost_virtqueue vq; | |
3dfbff32 MT |
186 | /* |
187 | * Reference counting for inflight reqs, used for flush operation. At | |
188 | * each time, one reference tracks new commands submitted, while we | |
189 | * wait for another one to reach 0. | |
190 | */ | |
f2f0173d | 191 | struct vhost_scsi_inflight inflights[2]; |
3dfbff32 MT |
192 | /* |
193 | * Indicate current inflight in use, protected by vq->mutex. | |
194 | * Writers must also take dev mutex and flush under it. | |
195 | */ | |
f2f0173d | 196 | int inflight_idx; |
3ab2e420 AH |
197 | }; |
198 | ||
057cbf49 | 199 | struct vhost_scsi { |
67e18cf9 | 200 | /* Protected by vhost_scsi->dev.mutex */ |
4f7f46d3 | 201 | struct tcm_vhost_tpg **vs_tpg; |
67e18cf9 | 202 | char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
67e18cf9 | 203 | |
057cbf49 | 204 | struct vhost_dev dev; |
3ab2e420 | 205 | struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ]; |
057cbf49 NB |
206 | |
207 | struct vhost_work vs_completion_work; /* cmd completion work item */ | |
9d6064a3 | 208 | struct llist_head vs_completion_list; /* cmd completion queue */ |
a6c9af87 AH |
209 | |
210 | struct vhost_work vs_event_work; /* evt injection work item */ | |
211 | struct llist_head vs_event_list; /* evt injection queue */ | |
212 | ||
213 | bool vs_events_missed; /* any missed events, protected by vq->mutex */ | |
214 | int vs_events_nr; /* num of pending events, protected by vq->mutex */ | |
057cbf49 NB |
215 | }; |
216 | ||
217 | /* Local pointer to allocated TCM configfs fabric module */ | |
218 | static struct target_fabric_configfs *tcm_vhost_fabric_configfs; | |
219 | ||
220 | static struct workqueue_struct *tcm_vhost_workqueue; | |
221 | ||
222 | /* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */ | |
223 | static DEFINE_MUTEX(tcm_vhost_mutex); | |
224 | static LIST_HEAD(tcm_vhost_list); | |
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 | ||
0a1febf7 | 232 | static void tcm_vhost_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 | ||
240 | static void tcm_vhost_init_inflight(struct vhost_scsi *vs, | |
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 * | |
268 | tcm_vhost_get_inflight(struct vhost_virtqueue *vq) | |
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 | ||
280 | static void tcm_vhost_put_inflight(struct vhost_scsi_inflight *inflight) | |
281 | { | |
282 | kref_put(&inflight->kref, tcm_vhost_done_inflight); | |
283 | } | |
284 | ||
057cbf49 NB |
285 | static int tcm_vhost_check_true(struct se_portal_group *se_tpg) |
286 | { | |
287 | return 1; | |
288 | } | |
289 | ||
290 | static int tcm_vhost_check_false(struct se_portal_group *se_tpg) | |
291 | { | |
292 | return 0; | |
293 | } | |
294 | ||
295 | static char *tcm_vhost_get_fabric_name(void) | |
296 | { | |
297 | return "vhost"; | |
298 | } | |
299 | ||
300 | static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg) | |
301 | { | |
302 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
303 | struct tcm_vhost_tpg, se_tpg); | |
304 | struct tcm_vhost_tport *tport = tpg->tport; | |
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 | ||
322 | static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg) | |
323 | { | |
324 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
325 | struct tcm_vhost_tpg, se_tpg); | |
326 | struct tcm_vhost_tport *tport = tpg->tport; | |
327 | ||
328 | return &tport->tport_name[0]; | |
329 | } | |
330 | ||
331 | static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg) | |
332 | { | |
333 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
334 | struct tcm_vhost_tpg, se_tpg); | |
335 | return tpg->tport_tpgt; | |
336 | } | |
337 | ||
338 | static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg) | |
339 | { | |
340 | return 1; | |
341 | } | |
342 | ||
683bd967 AH |
343 | static u32 |
344 | tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg, | |
345 | struct se_node_acl *se_nacl, | |
346 | struct t10_pr_registration *pr_reg, | |
347 | int *format_code, | |
348 | unsigned char *buf) | |
057cbf49 NB |
349 | { |
350 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
351 | struct tcm_vhost_tpg, se_tpg); | |
352 | struct tcm_vhost_tport *tport = tpg->tport; | |
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 AH |
374 | static u32 |
375 | tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg, | |
376 | struct se_node_acl *se_nacl, | |
377 | struct t10_pr_registration *pr_reg, | |
378 | int *format_code) | |
057cbf49 NB |
379 | { |
380 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
381 | struct tcm_vhost_tpg, se_tpg); | |
382 | struct tcm_vhost_tport *tport = tpg->tport; | |
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 AH |
404 | static char * |
405 | tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg, | |
406 | const char *buf, | |
407 | u32 *out_tid_len, | |
408 | char **port_nexus_ptr) | |
057cbf49 NB |
409 | { |
410 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
411 | struct tcm_vhost_tpg, se_tpg); | |
412 | struct tcm_vhost_tport *tport = tpg->tport; | |
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 | ||
683bd967 AH |
434 | static struct se_node_acl * |
435 | tcm_vhost_alloc_fabric_acl(struct se_portal_group *se_tpg) | |
057cbf49 NB |
436 | { |
437 | struct tcm_vhost_nacl *nacl; | |
438 | ||
439 | nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL); | |
440 | if (!nacl) { | |
744627e9 | 441 | pr_err("Unable to allocate struct tcm_vhost_nacl\n"); |
057cbf49 NB |
442 | return NULL; |
443 | } | |
444 | ||
445 | return &nacl->se_node_acl; | |
446 | } | |
447 | ||
683bd967 AH |
448 | static void |
449 | tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg, | |
450 | struct se_node_acl *se_nacl) | |
057cbf49 NB |
451 | { |
452 | struct tcm_vhost_nacl *nacl = container_of(se_nacl, | |
453 | struct tcm_vhost_nacl, se_node_acl); | |
454 | kfree(nacl); | |
455 | } | |
456 | ||
457 | static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg) | |
458 | { | |
459 | return 1; | |
460 | } | |
461 | ||
462 | static void tcm_vhost_release_cmd(struct se_cmd *se_cmd) | |
463 | { | |
084ed45b NB |
464 | struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd, |
465 | struct tcm_vhost_cmd, tvc_se_cmd); | |
de1419e4 | 466 | struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess; |
e31885dd | 467 | int i; |
084ed45b NB |
468 | |
469 | if (tv_cmd->tvc_sgl_count) { | |
084ed45b NB |
470 | for (i = 0; i < tv_cmd->tvc_sgl_count; i++) |
471 | put_page(sg_page(&tv_cmd->tvc_sgl[i])); | |
d3d665a6 | 472 | } |
e31885dd NB |
473 | if (tv_cmd->tvc_prot_sgl_count) { |
474 | for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++) | |
475 | put_page(sg_page(&tv_cmd->tvc_prot_sgl[i])); | |
476 | } | |
084ed45b NB |
477 | |
478 | tcm_vhost_put_inflight(tv_cmd->inflight); | |
4824d3bf | 479 | percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag); |
057cbf49 NB |
480 | } |
481 | ||
482 | static int tcm_vhost_shutdown_session(struct se_session *se_sess) | |
483 | { | |
484 | return 0; | |
485 | } | |
486 | ||
487 | static void tcm_vhost_close_session(struct se_session *se_sess) | |
488 | { | |
489 | return; | |
490 | } | |
491 | ||
492 | static u32 tcm_vhost_sess_get_index(struct se_session *se_sess) | |
493 | { | |
494 | return 0; | |
495 | } | |
496 | ||
497 | static int tcm_vhost_write_pending(struct se_cmd *se_cmd) | |
498 | { | |
499 | /* Go ahead and process the write immediately */ | |
500 | target_execute_cmd(se_cmd); | |
501 | return 0; | |
502 | } | |
503 | ||
504 | static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd) | |
505 | { | |
506 | return 0; | |
507 | } | |
508 | ||
509 | static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl) | |
510 | { | |
511 | return; | |
512 | } | |
513 | ||
514 | static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd) | |
515 | { | |
516 | return 0; | |
517 | } | |
518 | ||
519 | static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd) | |
520 | { | |
521 | return 0; | |
522 | } | |
523 | ||
3c63f66a | 524 | static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *cmd) |
101998f6 | 525 | { |
3c63f66a | 526 | struct vhost_scsi *vs = cmd->tvc_vhost; |
101998f6 | 527 | |
3c63f66a | 528 | llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
101998f6 NB |
529 | |
530 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
531 | } | |
057cbf49 NB |
532 | |
533 | static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd) | |
534 | { | |
3c63f66a | 535 | struct tcm_vhost_cmd *cmd = container_of(se_cmd, |
057cbf49 | 536 | struct tcm_vhost_cmd, tvc_se_cmd); |
3c63f66a | 537 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
538 | return 0; |
539 | } | |
540 | ||
541 | static int tcm_vhost_queue_status(struct se_cmd *se_cmd) | |
542 | { | |
3c63f66a | 543 | struct tcm_vhost_cmd *cmd = container_of(se_cmd, |
057cbf49 | 544 | struct tcm_vhost_cmd, tvc_se_cmd); |
3c63f66a | 545 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
546 | return 0; |
547 | } | |
548 | ||
b79fafac | 549 | static void tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd) |
057cbf49 | 550 | { |
b79fafac | 551 | return; |
057cbf49 NB |
552 | } |
553 | ||
131e6abc NB |
554 | static void tcm_vhost_aborted_task(struct se_cmd *se_cmd) |
555 | { | |
556 | return; | |
557 | } | |
558 | ||
a6c9af87 AH |
559 | static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt) |
560 | { | |
561 | vs->vs_events_nr--; | |
562 | kfree(evt); | |
563 | } | |
564 | ||
683bd967 AH |
565 | static struct tcm_vhost_evt * |
566 | tcm_vhost_allocate_evt(struct vhost_scsi *vs, | |
567 | u32 event, u32 reason) | |
a6c9af87 | 568 | { |
3ab2e420 | 569 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
570 | struct tcm_vhost_evt *evt; |
571 | ||
572 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
573 | vs->vs_events_missed = true; | |
574 | return NULL; | |
575 | } | |
576 | ||
577 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
578 | if (!evt) { | |
579 | vq_err(vq, "Failed to allocate tcm_vhost_evt\n"); | |
580 | vs->vs_events_missed = true; | |
581 | return NULL; | |
582 | } | |
583 | ||
e72fd72e MT |
584 | evt->event.event = cpu_to_vhost32(vq, event); |
585 | evt->event.reason = cpu_to_vhost32(vq, reason); | |
a6c9af87 AH |
586 | vs->vs_events_nr++; |
587 | ||
588 | return evt; | |
589 | } | |
590 | ||
3c63f66a | 591 | static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *cmd) |
057cbf49 | 592 | { |
3c63f66a | 593 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
594 | |
595 | /* TODO locking against target/backend threads? */ | |
6c131d0c | 596 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 597 | |
084ed45b | 598 | } |
f2f0173d | 599 | |
084ed45b NB |
600 | static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) |
601 | { | |
602 | return target_put_sess_cmd(se_cmd->se_sess, se_cmd); | |
057cbf49 NB |
603 | } |
604 | ||
683bd967 AH |
605 | static void |
606 | tcm_vhost_do_evt_work(struct vhost_scsi *vs, struct tcm_vhost_evt *evt) | |
a6c9af87 | 607 | { |
3ab2e420 | 608 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
609 | struct virtio_scsi_event *event = &evt->event; |
610 | struct virtio_scsi_event __user *eventp; | |
611 | unsigned out, in; | |
612 | int head, ret; | |
613 | ||
614 | if (!vq->private_data) { | |
615 | vs->vs_events_missed = true; | |
616 | return; | |
617 | } | |
618 | ||
619 | again: | |
620 | vhost_disable_notify(&vs->dev, vq); | |
47283bef | 621 | head = vhost_get_vq_desc(vq, vq->iov, |
a6c9af87 AH |
622 | ARRAY_SIZE(vq->iov), &out, &in, |
623 | NULL, NULL); | |
624 | if (head < 0) { | |
625 | vs->vs_events_missed = true; | |
626 | return; | |
627 | } | |
628 | if (head == vq->num) { | |
629 | if (vhost_enable_notify(&vs->dev, vq)) | |
630 | goto again; | |
631 | vs->vs_events_missed = true; | |
632 | return; | |
633 | } | |
634 | ||
635 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { | |
636 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", | |
637 | vq->iov[out].iov_len); | |
638 | vs->vs_events_missed = true; | |
639 | return; | |
640 | } | |
641 | ||
642 | if (vs->vs_events_missed) { | |
e72fd72e | 643 | event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED); |
a6c9af87 AH |
644 | vs->vs_events_missed = false; |
645 | } | |
646 | ||
647 | eventp = vq->iov[out].iov_base; | |
648 | ret = __copy_to_user(eventp, event, sizeof(*event)); | |
649 | if (!ret) | |
650 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
651 | else | |
652 | vq_err(vq, "Faulted on tcm_vhost_send_event\n"); | |
653 | } | |
654 | ||
655 | static void tcm_vhost_evt_work(struct vhost_work *work) | |
656 | { | |
657 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
658 | vs_event_work); | |
3ab2e420 | 659 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
660 | struct tcm_vhost_evt *evt; |
661 | struct llist_node *llnode; | |
662 | ||
663 | mutex_lock(&vq->mutex); | |
664 | llnode = llist_del_all(&vs->vs_event_list); | |
665 | while (llnode) { | |
666 | evt = llist_entry(llnode, struct tcm_vhost_evt, list); | |
667 | llnode = llist_next(llnode); | |
668 | tcm_vhost_do_evt_work(vs, evt); | |
669 | tcm_vhost_free_evt(vs, evt); | |
670 | } | |
671 | mutex_unlock(&vq->mutex); | |
672 | } | |
673 | ||
057cbf49 NB |
674 | /* Fill in status and signal that we are done processing this command |
675 | * | |
676 | * This is scheduled in the vhost work queue so we are called with the owner | |
677 | * process mm and can access the vring. | |
678 | */ | |
679 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) | |
680 | { | |
681 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
682 | vs_completion_work); | |
1b7f390e | 683 | DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 684 | struct virtio_scsi_cmd_resp v_rsp; |
3c63f66a | 685 | struct tcm_vhost_cmd *cmd; |
9d6064a3 AH |
686 | struct llist_node *llnode; |
687 | struct se_cmd *se_cmd; | |
79c14141 | 688 | struct iov_iter iov_iter; |
1b7f390e | 689 | int ret, vq; |
057cbf49 | 690 | |
1b7f390e | 691 | bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 AH |
692 | llnode = llist_del_all(&vs->vs_completion_list); |
693 | while (llnode) { | |
3c63f66a | 694 | cmd = llist_entry(llnode, struct tcm_vhost_cmd, |
9d6064a3 AH |
695 | tvc_completion_list); |
696 | llnode = llist_next(llnode); | |
3c63f66a | 697 | se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
698 | |
699 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
3c63f66a | 700 | cmd, se_cmd->residual_count, se_cmd->scsi_status); |
057cbf49 NB |
701 | |
702 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
e72fd72e | 703 | v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count); |
057cbf49 NB |
704 | /* TODO is status_qualifier field needed? */ |
705 | v_rsp.status = se_cmd->scsi_status; | |
e72fd72e MT |
706 | v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq, |
707 | se_cmd->scsi_sense_length); | |
3c63f66a | 708 | memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
e72fd72e | 709 | se_cmd->scsi_sense_length); |
79c14141 NB |
710 | |
711 | iov_iter_init(&iov_iter, READ, cmd->tvc_resp_iov, | |
712 | cmd->tvc_in_iovs, sizeof(v_rsp)); | |
713 | ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter); | |
714 | if (likely(ret == sizeof(v_rsp))) { | |
3ab2e420 | 715 | struct vhost_scsi_virtqueue *q; |
3c63f66a AH |
716 | vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
717 | q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); | |
3ab2e420 | 718 | vq = q - vs->vqs; |
1b7f390e AH |
719 | __set_bit(vq, signal); |
720 | } else | |
057cbf49 NB |
721 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
722 | ||
3c63f66a | 723 | vhost_scsi_free_cmd(cmd); |
057cbf49 NB |
724 | } |
725 | ||
1b7f390e AH |
726 | vq = -1; |
727 | while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) | |
728 | < VHOST_SCSI_MAX_VQ) | |
3ab2e420 | 729 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
730 | } |
731 | ||
683bd967 | 732 | static struct tcm_vhost_cmd * |
95e7c434 NB |
733 | vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct tcm_vhost_tpg *tpg, |
734 | unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr, | |
735 | u32 exp_data_len, int data_direction) | |
057cbf49 | 736 | { |
3c63f66a | 737 | struct tcm_vhost_cmd *cmd; |
057cbf49 | 738 | struct tcm_vhost_nexus *tv_nexus; |
4824d3bf | 739 | struct se_session *se_sess; |
b1935f68 | 740 | struct scatterlist *sg, *prot_sg; |
3aee26b4 | 741 | struct page **pages; |
4824d3bf | 742 | int tag; |
057cbf49 | 743 | |
98718312 | 744 | tv_nexus = tpg->tpg_nexus; |
057cbf49 NB |
745 | if (!tv_nexus) { |
746 | pr_err("Unable to locate active struct tcm_vhost_nexus\n"); | |
747 | return ERR_PTR(-EIO); | |
748 | } | |
4824d3bf | 749 | se_sess = tv_nexus->tvn_se_sess; |
057cbf49 | 750 | |
6f6b5d1e | 751 | tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING); |
4a47d3a1 NB |
752 | if (tag < 0) { |
753 | pr_err("Unable to obtain tag for tcm_vhost_cmd\n"); | |
754 | return ERR_PTR(-ENOMEM); | |
755 | } | |
756 | ||
4824d3bf | 757 | cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[tag]; |
3aee26b4 | 758 | sg = cmd->tvc_sgl; |
b1935f68 | 759 | prot_sg = cmd->tvc_prot_sgl; |
3aee26b4 | 760 | pages = cmd->tvc_upages; |
4824d3bf NB |
761 | memset(cmd, 0, sizeof(struct tcm_vhost_cmd)); |
762 | ||
3aee26b4 | 763 | cmd->tvc_sgl = sg; |
b1935f68 | 764 | cmd->tvc_prot_sgl = prot_sg; |
3aee26b4 | 765 | cmd->tvc_upages = pages; |
4824d3bf | 766 | cmd->tvc_se_cmd.map_tag = tag; |
95e7c434 NB |
767 | cmd->tvc_tag = scsi_tag; |
768 | cmd->tvc_lun = lun; | |
769 | cmd->tvc_task_attr = task_attr; | |
3c63f66a AH |
770 | cmd->tvc_exp_data_len = exp_data_len; |
771 | cmd->tvc_data_direction = data_direction; | |
772 | cmd->tvc_nexus = tv_nexus; | |
773 | cmd->inflight = tcm_vhost_get_inflight(vq); | |
774 | ||
95e7c434 NB |
775 | memcpy(cmd->tvc_cdb, cdb, TCM_VHOST_MAX_CDB_SIZE); |
776 | ||
3c63f66a | 777 | return cmd; |
057cbf49 NB |
778 | } |
779 | ||
780 | /* | |
781 | * Map a user memory range into a scatterlist | |
782 | * | |
783 | * Returns the number of scatterlist entries used or -errno on error. | |
784 | */ | |
683bd967 | 785 | static int |
b4078b5f NB |
786 | vhost_scsi_map_to_sgl(struct tcm_vhost_cmd *cmd, |
787 | void __user *ptr, | |
788 | size_t len, | |
3aee26b4 | 789 | struct scatterlist *sgl, |
5a01d082 | 790 | bool write) |
057cbf49 | 791 | { |
b4078b5f NB |
792 | unsigned int npages = 0, offset, nbytes; |
793 | unsigned int pages_nr = iov_num_pages(ptr, len); | |
057cbf49 | 794 | struct scatterlist *sg = sgl; |
b4078b5f | 795 | struct page **pages = cmd->tvc_upages; |
1810053e | 796 | int ret, i; |
057cbf49 | 797 | |
5a01d082 | 798 | if (pages_nr > TCM_VHOST_PREALLOC_UPAGES) { |
3aee26b4 | 799 | pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than" |
5a01d082 NB |
800 | " preallocated TCM_VHOST_PREALLOC_UPAGES: %u\n", |
801 | pages_nr, TCM_VHOST_PREALLOC_UPAGES); | |
3aee26b4 NB |
802 | return -ENOBUFS; |
803 | } | |
804 | ||
1810053e AH |
805 | ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages); |
806 | /* No pages were pinned */ | |
807 | if (ret < 0) | |
808 | goto out; | |
809 | /* Less pages pinned than wanted */ | |
810 | if (ret != pages_nr) { | |
811 | for (i = 0; i < ret; i++) | |
812 | put_page(pages[i]); | |
813 | ret = -EFAULT; | |
814 | goto out; | |
815 | } | |
816 | ||
817 | while (len > 0) { | |
818 | offset = (uintptr_t)ptr & ~PAGE_MASK; | |
819 | nbytes = min_t(unsigned int, PAGE_SIZE - offset, len); | |
820 | sg_set_page(sg, pages[npages], nbytes, offset); | |
057cbf49 NB |
821 | ptr += nbytes; |
822 | len -= nbytes; | |
823 | sg++; | |
824 | npages++; | |
825 | } | |
057cbf49 | 826 | |
1810053e | 827 | out: |
057cbf49 NB |
828 | return ret; |
829 | } | |
830 | ||
e8de56b5 NB |
831 | static int |
832 | vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls) | |
833 | { | |
834 | int sgl_count = 0; | |
835 | ||
836 | if (!iter || !iter->iov) { | |
837 | pr_err("%s: iter->iov is NULL, but expected bytes: %zu" | |
838 | " present\n", __func__, bytes); | |
839 | return -EINVAL; | |
840 | } | |
841 | ||
842 | sgl_count = iov_iter_npages(iter, 0xffff); | |
843 | if (sgl_count > max_sgls) { | |
844 | pr_err("%s: requested sgl_count: %d exceeds pre-allocated" | |
845 | " max_sgls: %d\n", __func__, sgl_count, max_sgls); | |
846 | return -EINVAL; | |
847 | } | |
848 | return sgl_count; | |
849 | } | |
850 | ||
851 | static int | |
852 | vhost_scsi_iov_to_sgl(struct tcm_vhost_cmd *cmd, bool write, | |
853 | struct iov_iter *iter, struct scatterlist *sg, | |
854 | int sg_count) | |
855 | { | |
856 | size_t off = iter->iov_offset; | |
857 | int i, ret; | |
858 | ||
859 | for (i = 0; i < iter->nr_segs; i++) { | |
860 | void __user *base = iter->iov[i].iov_base + off; | |
861 | size_t len = iter->iov[i].iov_len - off; | |
862 | ||
863 | ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write); | |
864 | if (ret < 0) { | |
865 | for (i = 0; i < sg_count; i++) { | |
866 | struct page *page = sg_page(&sg[i]); | |
867 | if (page) | |
868 | put_page(page); | |
869 | } | |
870 | return ret; | |
871 | } | |
872 | sg += ret; | |
873 | off = 0; | |
874 | } | |
875 | return 0; | |
876 | } | |
877 | ||
878 | static int | |
879 | vhost_scsi_mapal(struct tcm_vhost_cmd *cmd, | |
880 | size_t prot_bytes, struct iov_iter *prot_iter, | |
881 | size_t data_bytes, struct iov_iter *data_iter) | |
882 | { | |
883 | int sgl_count, ret; | |
884 | bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE); | |
885 | ||
886 | if (prot_bytes) { | |
887 | sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes, | |
888 | TCM_VHOST_PREALLOC_PROT_SGLS); | |
889 | if (sgl_count < 0) | |
890 | return sgl_count; | |
891 | ||
892 | sg_init_table(cmd->tvc_prot_sgl, sgl_count); | |
893 | cmd->tvc_prot_sgl_count = sgl_count; | |
894 | pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__, | |
895 | cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count); | |
896 | ||
897 | ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter, | |
898 | cmd->tvc_prot_sgl, | |
899 | cmd->tvc_prot_sgl_count); | |
900 | if (ret < 0) { | |
901 | cmd->tvc_prot_sgl_count = 0; | |
902 | return ret; | |
903 | } | |
904 | } | |
905 | sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes, | |
906 | TCM_VHOST_PREALLOC_SGLS); | |
907 | if (sgl_count < 0) | |
908 | return sgl_count; | |
909 | ||
910 | sg_init_table(cmd->tvc_sgl, sgl_count); | |
911 | cmd->tvc_sgl_count = sgl_count; | |
912 | pr_debug("%s data_sg %p data_sgl_count %u\n", __func__, | |
913 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
914 | ||
915 | ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter, | |
916 | cmd->tvc_sgl, cmd->tvc_sgl_count); | |
917 | if (ret < 0) { | |
918 | cmd->tvc_sgl_count = 0; | |
919 | return ret; | |
920 | } | |
921 | return 0; | |
922 | } | |
923 | ||
057cbf49 NB |
924 | static void tcm_vhost_submission_work(struct work_struct *work) |
925 | { | |
3c63f66a | 926 | struct tcm_vhost_cmd *cmd = |
057cbf49 | 927 | container_of(work, struct tcm_vhost_cmd, work); |
9f0abc15 | 928 | struct tcm_vhost_nexus *tv_nexus; |
3c63f66a | 929 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
95e7c434 NB |
930 | struct scatterlist *sg_ptr, *sg_prot_ptr = NULL; |
931 | int rc; | |
057cbf49 | 932 | |
95e7c434 | 933 | /* FIXME: BIDI operation */ |
3c63f66a AH |
934 | if (cmd->tvc_sgl_count) { |
935 | sg_ptr = cmd->tvc_sgl; | |
95e7c434 NB |
936 | |
937 | if (cmd->tvc_prot_sgl_count) | |
938 | sg_prot_ptr = cmd->tvc_prot_sgl; | |
939 | else | |
940 | se_cmd->prot_pto = true; | |
057cbf49 NB |
941 | } else { |
942 | sg_ptr = NULL; | |
943 | } | |
3c63f66a | 944 | tv_nexus = cmd->tvc_nexus; |
9f0abc15 NB |
945 | |
946 | rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, | |
3c63f66a AH |
947 | cmd->tvc_cdb, &cmd->tvc_sense_buf[0], |
948 | cmd->tvc_lun, cmd->tvc_exp_data_len, | |
949 | cmd->tvc_task_attr, cmd->tvc_data_direction, | |
6d2fa9e1 | 950 | TARGET_SCF_ACK_KREF, sg_ptr, cmd->tvc_sgl_count, |
95e7c434 | 951 | NULL, 0, sg_prot_ptr, cmd->tvc_prot_sgl_count); |
057cbf49 NB |
952 | if (rc < 0) { |
953 | transport_send_check_condition_and_sense(se_cmd, | |
9f0abc15 | 954 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
057cbf49 | 955 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 956 | } |
057cbf49 NB |
957 | } |
958 | ||
683bd967 AH |
959 | static void |
960 | vhost_scsi_send_bad_target(struct vhost_scsi *vs, | |
961 | struct vhost_virtqueue *vq, | |
962 | int head, unsigned out) | |
637ab21e AH |
963 | { |
964 | struct virtio_scsi_cmd_resp __user *resp; | |
965 | struct virtio_scsi_cmd_resp rsp; | |
966 | int ret; | |
967 | ||
968 | memset(&rsp, 0, sizeof(rsp)); | |
969 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
970 | resp = vq->iov[out].iov_base; | |
971 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
972 | if (!ret) | |
973 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
974 | else | |
975 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
976 | } | |
977 | ||
683bd967 AH |
978 | static void |
979 | vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
057cbf49 | 980 | { |
09b13fa8 | 981 | struct tcm_vhost_tpg **vs_tpg, *tpg; |
057cbf49 | 982 | struct virtio_scsi_cmd_req v_req; |
95e7c434 | 983 | struct virtio_scsi_cmd_req_pi v_req_pi; |
3c63f66a | 984 | struct tcm_vhost_cmd *cmd; |
09b13fa8 | 985 | struct iov_iter out_iter, in_iter, prot_iter, data_iter; |
95e7c434 | 986 | u64 tag; |
09b13fa8 NB |
987 | u32 exp_data_len, data_direction; |
988 | unsigned out, in; | |
989 | int head, ret, prot_bytes; | |
990 | size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp); | |
991 | size_t out_size, in_size; | |
95e7c434 NB |
992 | u16 lun; |
993 | u8 *target, *lunp, task_attr; | |
09b13fa8 | 994 | bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI); |
95e7c434 | 995 | void *req, *cdb; |
057cbf49 | 996 | |
e7802212 | 997 | mutex_lock(&vq->mutex); |
4f7f46d3 AH |
998 | /* |
999 | * We can handle the vq only after the endpoint is setup by calling the | |
1000 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
4f7f46d3 | 1001 | */ |
e7802212 | 1002 | vs_tpg = vq->private_data; |
4f7f46d3 | 1003 | if (!vs_tpg) |
e7802212 | 1004 | goto out; |
057cbf49 | 1005 | |
057cbf49 NB |
1006 | vhost_disable_notify(&vs->dev, vq); |
1007 | ||
1008 | for (;;) { | |
47283bef | 1009 | head = vhost_get_vq_desc(vq, vq->iov, |
09b13fa8 NB |
1010 | ARRAY_SIZE(vq->iov), &out, &in, |
1011 | NULL, NULL); | |
057cbf49 | 1012 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", |
09b13fa8 | 1013 | head, out, in); |
057cbf49 NB |
1014 | /* On error, stop handling until the next kick. */ |
1015 | if (unlikely(head < 0)) | |
1016 | break; | |
1017 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
1018 | if (head == vq->num) { | |
1019 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
1020 | vhost_disable_notify(&vs->dev, vq); | |
1021 | continue; | |
1022 | } | |
1023 | break; | |
1024 | } | |
057cbf49 | 1025 | /* |
09b13fa8 NB |
1026 | * Check for a sane response buffer so we can report early |
1027 | * errors back to the guest. | |
057cbf49 | 1028 | */ |
09b13fa8 NB |
1029 | if (unlikely(vq->iov[out].iov_len < rsp_size)) { |
1030 | vq_err(vq, "Expecting at least virtio_scsi_cmd_resp" | |
1031 | " size, got %zu bytes\n", vq->iov[out].iov_len); | |
057cbf49 NB |
1032 | break; |
1033 | } | |
09b13fa8 NB |
1034 | /* |
1035 | * Setup pointers and values based upon different virtio-scsi | |
1036 | * request header if T10_PI is enabled in KVM guest. | |
1037 | */ | |
1038 | if (t10_pi) { | |
95e7c434 | 1039 | req = &v_req_pi; |
09b13fa8 | 1040 | req_size = sizeof(v_req_pi); |
95e7c434 NB |
1041 | lunp = &v_req_pi.lun[0]; |
1042 | target = &v_req_pi.lun[1]; | |
95e7c434 NB |
1043 | } else { |
1044 | req = &v_req; | |
09b13fa8 | 1045 | req_size = sizeof(v_req); |
95e7c434 NB |
1046 | lunp = &v_req.lun[0]; |
1047 | target = &v_req.lun[1]; | |
95e7c434 | 1048 | } |
09b13fa8 NB |
1049 | /* |
1050 | * FIXME: Not correct for BIDI operation | |
1051 | */ | |
1052 | out_size = iov_length(vq->iov, out); | |
1053 | in_size = iov_length(&vq->iov[out], in); | |
95e7c434 | 1054 | |
09b13fa8 NB |
1055 | /* |
1056 | * Copy over the virtio-scsi request header, which for a | |
1057 | * ANY_LAYOUT enabled guest may span multiple iovecs, or a | |
1058 | * single iovec may contain both the header + outgoing | |
1059 | * WRITE payloads. | |
1060 | * | |
1061 | * copy_from_iter() will advance out_iter, so that it will | |
1062 | * point at the start of the outgoing WRITE payload, if | |
1063 | * DMA_TO_DEVICE is set. | |
1064 | */ | |
1065 | iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size); | |
1066 | ||
1067 | ret = copy_from_iter(req, req_size, &out_iter); | |
1068 | if (unlikely(ret != req_size)) { | |
1069 | vq_err(vq, "Faulted on copy_from_iter\n"); | |
de1419e4 NB |
1070 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1071 | continue; | |
057cbf49 | 1072 | } |
7fe412d0 | 1073 | /* virtio-scsi spec requires byte 0 of the lun to be 1 */ |
95e7c434 | 1074 | if (unlikely(*lunp != 1)) { |
09b13fa8 | 1075 | vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp); |
7fe412d0 VS |
1076 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1077 | continue; | |
1078 | } | |
1079 | ||
95e7c434 | 1080 | tpg = ACCESS_ONCE(vs_tpg[*target]); |
98718312 | 1081 | if (unlikely(!tpg)) { |
09b13fa8 | 1082 | /* Target does not exist, fail the request */ |
637ab21e | 1083 | vhost_scsi_send_bad_target(vs, vq, head, out); |
67e18cf9 AH |
1084 | continue; |
1085 | } | |
95e7c434 | 1086 | /* |
09b13fa8 NB |
1087 | * Determine data_direction by calculating the total outgoing |
1088 | * iovec sizes + incoming iovec sizes vs. virtio-scsi request + | |
1089 | * response headers respectively. | |
1090 | * | |
1091 | * For DMA_TO_DEVICE this is out_iter, which is already pointing | |
1092 | * to the right place. | |
1093 | * | |
1094 | * For DMA_FROM_DEVICE, the iovec will be just past the end | |
1095 | * of the virtio-scsi response header in either the same | |
1096 | * or immediately following iovec. | |
95e7c434 | 1097 | * |
09b13fa8 NB |
1098 | * Any associated T10_PI bytes for the outgoing / incoming |
1099 | * payloads are included in calculation of exp_data_len here. | |
1100 | */ | |
1101 | prot_bytes = 0; | |
1102 | ||
1103 | if (out_size > req_size) { | |
1104 | data_direction = DMA_TO_DEVICE; | |
1105 | exp_data_len = out_size - req_size; | |
1106 | data_iter = out_iter; | |
1107 | } else if (in_size > rsp_size) { | |
1108 | data_direction = DMA_FROM_DEVICE; | |
1109 | exp_data_len = in_size - rsp_size; | |
1110 | ||
1111 | iov_iter_init(&in_iter, READ, &vq->iov[out], in, | |
1112 | rsp_size + exp_data_len); | |
1113 | iov_iter_advance(&in_iter, rsp_size); | |
1114 | data_iter = in_iter; | |
1115 | } else { | |
1116 | data_direction = DMA_NONE; | |
1117 | exp_data_len = 0; | |
1118 | } | |
1119 | /* | |
1120 | * If T10_PI header + payload is present, setup prot_iter values | |
1121 | * and recalculate data_iter for vhost_scsi_mapal() mapping to | |
1122 | * host scatterlists via get_user_pages_fast(). | |
95e7c434 | 1123 | */ |
09b13fa8 | 1124 | if (t10_pi) { |
95e7c434 NB |
1125 | if (v_req_pi.pi_bytesout) { |
1126 | if (data_direction != DMA_TO_DEVICE) { | |
09b13fa8 NB |
1127 | vq_err(vq, "Received non zero pi_bytesout," |
1128 | " but wrong data_direction\n"); | |
de1419e4 NB |
1129 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1130 | continue; | |
95e7c434 | 1131 | } |
e72fd72e | 1132 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout); |
95e7c434 NB |
1133 | } else if (v_req_pi.pi_bytesin) { |
1134 | if (data_direction != DMA_FROM_DEVICE) { | |
09b13fa8 NB |
1135 | vq_err(vq, "Received non zero pi_bytesin," |
1136 | " but wrong data_direction\n"); | |
de1419e4 NB |
1137 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1138 | continue; | |
95e7c434 | 1139 | } |
e72fd72e | 1140 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin); |
95e7c434 | 1141 | } |
09b13fa8 NB |
1142 | /* |
1143 | * Set prot_iter to data_iter, and advance past any | |
1144 | * preceeding prot_bytes that may be present. | |
1145 | * | |
1146 | * Also fix up the exp_data_len to reflect only the | |
1147 | * actual data payload length. | |
1148 | */ | |
95e7c434 | 1149 | if (prot_bytes) { |
09b13fa8 NB |
1150 | exp_data_len -= prot_bytes; |
1151 | prot_iter = data_iter; | |
1152 | iov_iter_advance(&data_iter, prot_bytes); | |
95e7c434 | 1153 | } |
e72fd72e | 1154 | tag = vhost64_to_cpu(vq, v_req_pi.tag); |
95e7c434 NB |
1155 | task_attr = v_req_pi.task_attr; |
1156 | cdb = &v_req_pi.cdb[0]; | |
1157 | lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF; | |
1158 | } else { | |
e72fd72e | 1159 | tag = vhost64_to_cpu(vq, v_req.tag); |
95e7c434 NB |
1160 | task_attr = v_req.task_attr; |
1161 | cdb = &v_req.cdb[0]; | |
1162 | lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; | |
1163 | } | |
95e7c434 | 1164 | /* |
09b13fa8 NB |
1165 | * Check that the received CDB size does not exceeded our |
1166 | * hardcoded max for vhost-scsi, then get a pre-allocated | |
1167 | * cmd descriptor for the new virtio-scsi tag. | |
95e7c434 NB |
1168 | * |
1169 | * TODO what if cdb was too small for varlen cdb header? | |
1170 | */ | |
1171 | if (unlikely(scsi_command_size(cdb) > TCM_VHOST_MAX_CDB_SIZE)) { | |
1172 | vq_err(vq, "Received SCSI CDB with command_size: %d that" | |
1173 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
1174 | scsi_command_size(cdb), TCM_VHOST_MAX_CDB_SIZE); | |
de1419e4 NB |
1175 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1176 | continue; | |
95e7c434 | 1177 | } |
95e7c434 | 1178 | cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr, |
9f977ef7 NB |
1179 | exp_data_len + prot_bytes, |
1180 | data_direction); | |
3c63f66a | 1181 | if (IS_ERR(cmd)) { |
4824d3bf | 1182 | vq_err(vq, "vhost_scsi_get_tag failed %ld\n", |
09b13fa8 | 1183 | PTR_ERR(cmd)); |
de1419e4 NB |
1184 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1185 | continue; | |
057cbf49 | 1186 | } |
3c63f66a AH |
1187 | cmd->tvc_vhost = vs; |
1188 | cmd->tvc_vq = vq; | |
79c14141 NB |
1189 | cmd->tvc_resp_iov = &vq->iov[out]; |
1190 | cmd->tvc_in_iovs = in; | |
057cbf49 | 1191 | |
057cbf49 | 1192 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", |
09b13fa8 NB |
1193 | cmd->tvc_cdb[0], cmd->tvc_lun); |
1194 | pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:" | |
1195 | " %d\n", cmd, exp_data_len, prot_bytes, data_direction); | |
057cbf49 NB |
1196 | |
1197 | if (data_direction != DMA_NONE) { | |
09b13fa8 NB |
1198 | ret = vhost_scsi_mapal(cmd, |
1199 | prot_bytes, &prot_iter, | |
1200 | exp_data_len, &data_iter); | |
057cbf49 NB |
1201 | if (unlikely(ret)) { |
1202 | vq_err(vq, "Failed to map iov to sgl\n"); | |
de1419e4 NB |
1203 | tcm_vhost_release_cmd(&cmd->tvc_se_cmd); |
1204 | vhost_scsi_send_bad_target(vs, vq, head, out); | |
1205 | continue; | |
057cbf49 NB |
1206 | } |
1207 | } | |
057cbf49 NB |
1208 | /* |
1209 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
1210 | * complete the virtio-scsi request in TCM callback context via | |
09b13fa8 | 1211 | * vhost_scsi_queue_data_in() and vhost_scsi_queue_status() |
057cbf49 | 1212 | */ |
3c63f66a | 1213 | cmd->tvc_vq_desc = head; |
057cbf49 | 1214 | /* |
09b13fa8 NB |
1215 | * Dispatch cmd descriptor for cmwq execution in process |
1216 | * context provided by vhost_scsi_workqueue. This also ensures | |
1217 | * cmd is executed on the same kworker CPU as this vhost | |
1218 | * thread to gain positive L2 cache locality effects. | |
057cbf49 | 1219 | */ |
3c63f66a AH |
1220 | INIT_WORK(&cmd->work, tcm_vhost_submission_work); |
1221 | queue_work(tcm_vhost_workqueue, &cmd->work); | |
057cbf49 | 1222 | } |
e7802212 | 1223 | out: |
7ea206cf | 1224 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
1225 | } |
1226 | ||
1227 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) | |
1228 | { | |
101998f6 | 1229 | pr_debug("%s: The handling func for control queue.\n", __func__); |
057cbf49 NB |
1230 | } |
1231 | ||
683bd967 AH |
1232 | static void |
1233 | tcm_vhost_send_evt(struct vhost_scsi *vs, | |
1234 | struct tcm_vhost_tpg *tpg, | |
1235 | struct se_lun *lun, | |
1236 | u32 event, | |
1237 | u32 reason) | |
a6c9af87 AH |
1238 | { |
1239 | struct tcm_vhost_evt *evt; | |
1240 | ||
1241 | evt = tcm_vhost_allocate_evt(vs, event, reason); | |
1242 | if (!evt) | |
1243 | return; | |
1244 | ||
1245 | if (tpg && lun) { | |
1246 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
1247 | /* | |
1248 | * Note: evt->event is zeroed when we allocate it and | |
1249 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
1250 | */ | |
1251 | evt->event.lun[0] = 0x01; | |
1252 | evt->event.lun[1] = tpg->tport_tpgt & 0xFF; | |
1253 | if (lun->unpacked_lun >= 256) | |
1254 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
1255 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
1256 | } | |
1257 | ||
1258 | llist_add(&evt->list, &vs->vs_event_list); | |
1259 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
1260 | } | |
1261 | ||
057cbf49 NB |
1262 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
1263 | { | |
a6c9af87 AH |
1264 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1265 | poll.work); | |
1266 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1267 | ||
1268 | mutex_lock(&vq->mutex); | |
1269 | if (!vq->private_data) | |
1270 | goto out; | |
1271 | ||
1272 | if (vs->vs_events_missed) | |
1273 | tcm_vhost_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); | |
1274 | out: | |
1275 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
1276 | } |
1277 | ||
1278 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
1279 | { | |
1280 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
1281 | poll.work); | |
1282 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1283 | ||
1b7f390e | 1284 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
1285 | } |
1286 | ||
4f7f46d3 AH |
1287 | static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
1288 | { | |
3ab2e420 | 1289 | vhost_poll_flush(&vs->vqs[index].vq.poll); |
4f7f46d3 AH |
1290 | } |
1291 | ||
3dfbff32 | 1292 | /* Callers must hold dev mutex */ |
4f7f46d3 AH |
1293 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
1294 | { | |
f2f0173d | 1295 | struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; |
4f7f46d3 AH |
1296 | int i; |
1297 | ||
f2f0173d AH |
1298 | /* Init new inflight and remember the old inflight */ |
1299 | tcm_vhost_init_inflight(vs, old_inflight); | |
1300 | ||
1301 | /* | |
1302 | * The inflight->kref was initialized to 1. We decrement it here to | |
1303 | * indicate the start of the flush operation so that it will reach 0 | |
1304 | * when all the reqs are finished. | |
1305 | */ | |
1306 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1307 | kref_put(&old_inflight[i]->kref, tcm_vhost_done_inflight); | |
1308 | ||
1309 | /* Flush both the vhost poll and vhost work */ | |
4f7f46d3 AH |
1310 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
1311 | vhost_scsi_flush_vq(vs, i); | |
1312 | vhost_work_flush(&vs->dev, &vs->vs_completion_work); | |
a6c9af87 | 1313 | vhost_work_flush(&vs->dev, &vs->vs_event_work); |
f2f0173d AH |
1314 | |
1315 | /* Wait for all reqs issued before the flush to be finished */ | |
1316 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1317 | wait_for_completion(&old_inflight[i]->comp); | |
4f7f46d3 AH |
1318 | } |
1319 | ||
057cbf49 NB |
1320 | /* |
1321 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
1322 | * tcm_vhost_tpg with an active struct tcm_vhost_nexus | |
f2b7daf5 AH |
1323 | * |
1324 | * The lock nesting rule is: | |
1325 | * tcm_vhost_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex | |
057cbf49 | 1326 | */ |
683bd967 AH |
1327 | static int |
1328 | vhost_scsi_set_endpoint(struct vhost_scsi *vs, | |
1329 | struct vhost_scsi_target *t) | |
057cbf49 | 1330 | { |
ab8edab1 | 1331 | struct se_portal_group *se_tpg; |
057cbf49 | 1332 | struct tcm_vhost_tport *tv_tport; |
98718312 | 1333 | struct tcm_vhost_tpg *tpg; |
4f7f46d3 AH |
1334 | struct tcm_vhost_tpg **vs_tpg; |
1335 | struct vhost_virtqueue *vq; | |
1336 | int index, ret, i, len; | |
67e18cf9 | 1337 | bool match = false; |
057cbf49 | 1338 | |
f2b7daf5 | 1339 | mutex_lock(&tcm_vhost_mutex); |
057cbf49 | 1340 | mutex_lock(&vs->dev.mutex); |
f2b7daf5 | 1341 | |
057cbf49 NB |
1342 | /* Verify that ring has been setup correctly. */ |
1343 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
1344 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 1345 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
1346 | ret = -EFAULT; |
1347 | goto out; | |
057cbf49 NB |
1348 | } |
1349 | } | |
057cbf49 | 1350 | |
4f7f46d3 AH |
1351 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
1352 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
1353 | if (!vs_tpg) { | |
f2b7daf5 AH |
1354 | ret = -ENOMEM; |
1355 | goto out; | |
4f7f46d3 AH |
1356 | } |
1357 | if (vs->vs_tpg) | |
1358 | memcpy(vs_tpg, vs->vs_tpg, len); | |
1359 | ||
98718312 AH |
1360 | list_for_each_entry(tpg, &tcm_vhost_list, tv_tpg_list) { |
1361 | mutex_lock(&tpg->tv_tpg_mutex); | |
1362 | if (!tpg->tpg_nexus) { | |
1363 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1364 | continue; |
1365 | } | |
98718312 AH |
1366 | if (tpg->tv_tpg_vhost_count != 0) { |
1367 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1368 | continue; |
1369 | } | |
98718312 | 1370 | tv_tport = tpg->tport; |
057cbf49 | 1371 | |
67e18cf9 | 1372 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
98718312 | 1373 | if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
4f7f46d3 | 1374 | kfree(vs_tpg); |
98718312 | 1375 | mutex_unlock(&tpg->tv_tpg_mutex); |
f2b7daf5 AH |
1376 | ret = -EEXIST; |
1377 | goto out; | |
101998f6 | 1378 | } |
ab8edab1 NB |
1379 | /* |
1380 | * In order to ensure individual vhost-scsi configfs | |
1381 | * groups cannot be removed while in use by vhost ioctl, | |
1382 | * go ahead and take an explicit se_tpg->tpg_group.cg_item | |
1383 | * dependency now. | |
1384 | */ | |
1385 | se_tpg = &tpg->se_tpg; | |
1386 | ret = configfs_depend_item(se_tpg->se_tpg_tfo->tf_subsys, | |
1387 | &se_tpg->tpg_group.cg_item); | |
1388 | if (ret) { | |
1389 | pr_warn("configfs_depend_item() failed: %d\n", ret); | |
1390 | kfree(vs_tpg); | |
1391 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1392 | goto out; | |
1393 | } | |
98718312 AH |
1394 | tpg->tv_tpg_vhost_count++; |
1395 | tpg->vhost_scsi = vs; | |
1396 | vs_tpg[tpg->tport_tpgt] = tpg; | |
4e857c58 | 1397 | smp_mb__after_atomic(); |
67e18cf9 | 1398 | match = true; |
057cbf49 | 1399 | } |
98718312 | 1400 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1401 | } |
67e18cf9 AH |
1402 | |
1403 | if (match) { | |
1404 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1405 | sizeof(vs->vs_vhost_wwpn)); | |
4f7f46d3 | 1406 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
3ab2e420 | 1407 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1408 | mutex_lock(&vq->mutex); |
22fa90c7 | 1409 | vq->private_data = vs_tpg; |
dfd5d569 | 1410 | vhost_init_used(vq); |
4f7f46d3 AH |
1411 | mutex_unlock(&vq->mutex); |
1412 | } | |
67e18cf9 AH |
1413 | ret = 0; |
1414 | } else { | |
1415 | ret = -EEXIST; | |
1416 | } | |
1417 | ||
4f7f46d3 AH |
1418 | /* |
1419 | * Act as synchronize_rcu to make sure access to | |
1420 | * old vs->vs_tpg is finished. | |
1421 | */ | |
1422 | vhost_scsi_flush(vs); | |
1423 | kfree(vs->vs_tpg); | |
1424 | vs->vs_tpg = vs_tpg; | |
1425 | ||
f2b7daf5 | 1426 | out: |
67e18cf9 | 1427 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1428 | mutex_unlock(&tcm_vhost_mutex); |
67e18cf9 | 1429 | return ret; |
057cbf49 NB |
1430 | } |
1431 | ||
683bd967 AH |
1432 | static int |
1433 | vhost_scsi_clear_endpoint(struct vhost_scsi *vs, | |
1434 | struct vhost_scsi_target *t) | |
057cbf49 | 1435 | { |
ab8edab1 | 1436 | struct se_portal_group *se_tpg; |
057cbf49 | 1437 | struct tcm_vhost_tport *tv_tport; |
98718312 | 1438 | struct tcm_vhost_tpg *tpg; |
4f7f46d3 AH |
1439 | struct vhost_virtqueue *vq; |
1440 | bool match = false; | |
67e18cf9 AH |
1441 | int index, ret, i; |
1442 | u8 target; | |
057cbf49 | 1443 | |
f2b7daf5 | 1444 | mutex_lock(&tcm_vhost_mutex); |
057cbf49 NB |
1445 | mutex_lock(&vs->dev.mutex); |
1446 | /* Verify that ring has been setup correctly. */ | |
1447 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1448 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1449 | ret = -EFAULT; |
038e0af4 | 1450 | goto err_dev; |
057cbf49 NB |
1451 | } |
1452 | } | |
4f7f46d3 AH |
1453 | |
1454 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1455 | ret = 0; |
1456 | goto err_dev; | |
4f7f46d3 AH |
1457 | } |
1458 | ||
67e18cf9 AH |
1459 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1460 | target = i; | |
98718312 AH |
1461 | tpg = vs->vs_tpg[target]; |
1462 | if (!tpg) | |
67e18cf9 AH |
1463 | continue; |
1464 | ||
98718312 AH |
1465 | mutex_lock(&tpg->tv_tpg_mutex); |
1466 | tv_tport = tpg->tport; | |
67e18cf9 AH |
1467 | if (!tv_tport) { |
1468 | ret = -ENODEV; | |
038e0af4 | 1469 | goto err_tpg; |
67e18cf9 AH |
1470 | } |
1471 | ||
1472 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
98718312 | 1473 | pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" |
67e18cf9 | 1474 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", |
98718312 | 1475 | tv_tport->tport_name, tpg->tport_tpgt, |
67e18cf9 AH |
1476 | t->vhost_wwpn, t->vhost_tpgt); |
1477 | ret = -EINVAL; | |
038e0af4 | 1478 | goto err_tpg; |
67e18cf9 | 1479 | } |
98718312 AH |
1480 | tpg->tv_tpg_vhost_count--; |
1481 | tpg->vhost_scsi = NULL; | |
67e18cf9 | 1482 | vs->vs_tpg[target] = NULL; |
4f7f46d3 | 1483 | match = true; |
98718312 | 1484 | mutex_unlock(&tpg->tv_tpg_mutex); |
ab8edab1 NB |
1485 | /* |
1486 | * Release se_tpg->tpg_group.cg_item configfs dependency now | |
1487 | * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur. | |
1488 | */ | |
1489 | se_tpg = &tpg->se_tpg; | |
1490 | configfs_undepend_item(se_tpg->se_tpg_tfo->tf_subsys, | |
1491 | &se_tpg->tpg_group.cg_item); | |
057cbf49 | 1492 | } |
4f7f46d3 AH |
1493 | if (match) { |
1494 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
3ab2e420 | 1495 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1496 | mutex_lock(&vq->mutex); |
22fa90c7 | 1497 | vq->private_data = NULL; |
4f7f46d3 AH |
1498 | mutex_unlock(&vq->mutex); |
1499 | } | |
1500 | } | |
1501 | /* | |
1502 | * Act as synchronize_rcu to make sure access to | |
1503 | * old vs->vs_tpg is finished. | |
1504 | */ | |
1505 | vhost_scsi_flush(vs); | |
1506 | kfree(vs->vs_tpg); | |
1507 | vs->vs_tpg = NULL; | |
a6c9af87 | 1508 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1509 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1510 | mutex_unlock(&tcm_vhost_mutex); |
057cbf49 | 1511 | return 0; |
101998f6 | 1512 | |
038e0af4 | 1513 | err_tpg: |
98718312 | 1514 | mutex_unlock(&tpg->tv_tpg_mutex); |
038e0af4 | 1515 | err_dev: |
101998f6 | 1516 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1517 | mutex_unlock(&tcm_vhost_mutex); |
101998f6 | 1518 | return ret; |
057cbf49 NB |
1519 | } |
1520 | ||
4f7f46d3 AH |
1521 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1522 | { | |
ea16c514 MT |
1523 | struct vhost_virtqueue *vq; |
1524 | int i; | |
1525 | ||
4f7f46d3 AH |
1526 | if (features & ~VHOST_SCSI_FEATURES) |
1527 | return -EOPNOTSUPP; | |
1528 | ||
1529 | mutex_lock(&vs->dev.mutex); | |
1530 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1531 | !vhost_log_access_ok(&vs->dev)) { | |
1532 | mutex_unlock(&vs->dev.mutex); | |
1533 | return -EFAULT; | |
1534 | } | |
ea16c514 MT |
1535 | |
1536 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
1537 | vq = &vs->vqs[i].vq; | |
1538 | mutex_lock(&vq->mutex); | |
1539 | vq->acked_features = features; | |
1540 | mutex_unlock(&vq->mutex); | |
1541 | } | |
4f7f46d3 AH |
1542 | mutex_unlock(&vs->dev.mutex); |
1543 | return 0; | |
1544 | } | |
1545 | ||
057cbf49 NB |
1546 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1547 | { | |
c7289312 | 1548 | struct vhost_scsi *vs; |
3ab2e420 | 1549 | struct vhost_virtqueue **vqs; |
595cb754 | 1550 | int r = -ENOMEM, i; |
057cbf49 | 1551 | |
595cb754 MT |
1552 | vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
1553 | if (!vs) { | |
1554 | vs = vzalloc(sizeof(*vs)); | |
1555 | if (!vs) | |
1556 | goto err_vs; | |
1557 | } | |
057cbf49 | 1558 | |
3ab2e420 | 1559 | vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL); |
595cb754 MT |
1560 | if (!vqs) |
1561 | goto err_vqs; | |
3ab2e420 | 1562 | |
c7289312 AH |
1563 | vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); |
1564 | vhost_work_init(&vs->vs_event_work, tcm_vhost_evt_work); | |
a6c9af87 | 1565 | |
c7289312 AH |
1566 | vs->vs_events_nr = 0; |
1567 | vs->vs_events_missed = false; | |
057cbf49 | 1568 | |
c7289312 AH |
1569 | vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; |
1570 | vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1571 | vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1572 | vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
3ab2e420 | 1573 | for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { |
c7289312 AH |
1574 | vqs[i] = &vs->vqs[i].vq; |
1575 | vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
3ab2e420 | 1576 | } |
59566b6e | 1577 | vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ); |
f2f0173d | 1578 | |
c7289312 | 1579 | tcm_vhost_init_inflight(vs, NULL); |
f2f0173d | 1580 | |
c7289312 | 1581 | f->private_data = vs; |
057cbf49 | 1582 | return 0; |
595cb754 | 1583 | |
595cb754 | 1584 | err_vqs: |
68404441 | 1585 | kvfree(vs); |
595cb754 MT |
1586 | err_vs: |
1587 | return r; | |
057cbf49 NB |
1588 | } |
1589 | ||
1590 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1591 | { | |
c7289312 | 1592 | struct vhost_scsi *vs = f->private_data; |
67e18cf9 | 1593 | struct vhost_scsi_target t; |
057cbf49 | 1594 | |
c7289312 AH |
1595 | mutex_lock(&vs->dev.mutex); |
1596 | memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1597 | mutex_unlock(&vs->dev.mutex); | |
1598 | vhost_scsi_clear_endpoint(vs, &t); | |
1599 | vhost_dev_stop(&vs->dev); | |
1600 | vhost_dev_cleanup(&vs->dev, false); | |
a6c9af87 | 1601 | /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
c7289312 AH |
1602 | vhost_scsi_flush(vs); |
1603 | kfree(vs->dev.vqs); | |
68404441 | 1604 | kvfree(vs); |
057cbf49 NB |
1605 | return 0; |
1606 | } | |
1607 | ||
683bd967 AH |
1608 | static long |
1609 | vhost_scsi_ioctl(struct file *f, | |
1610 | unsigned int ioctl, | |
1611 | unsigned long arg) | |
057cbf49 NB |
1612 | { |
1613 | struct vhost_scsi *vs = f->private_data; | |
1614 | struct vhost_scsi_target backend; | |
1615 | void __user *argp = (void __user *)arg; | |
1616 | u64 __user *featurep = argp; | |
11c63418 AH |
1617 | u32 __user *eventsp = argp; |
1618 | u32 events_missed; | |
057cbf49 | 1619 | u64 features; |
101998f6 | 1620 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1621 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1622 | |
1623 | switch (ioctl) { | |
1624 | case VHOST_SCSI_SET_ENDPOINT: | |
1625 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1626 | return -EFAULT; | |
6de7145c MT |
1627 | if (backend.reserved != 0) |
1628 | return -EOPNOTSUPP; | |
057cbf49 NB |
1629 | |
1630 | return vhost_scsi_set_endpoint(vs, &backend); | |
1631 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1632 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1633 | return -EFAULT; | |
6de7145c MT |
1634 | if (backend.reserved != 0) |
1635 | return -EOPNOTSUPP; | |
057cbf49 NB |
1636 | |
1637 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1638 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1639 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1640 | return -EFAULT; |
1641 | return 0; | |
11c63418 AH |
1642 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1643 | if (get_user(events_missed, eventsp)) | |
1644 | return -EFAULT; | |
1645 | mutex_lock(&vq->mutex); | |
1646 | vs->vs_events_missed = events_missed; | |
1647 | mutex_unlock(&vq->mutex); | |
1648 | return 0; | |
1649 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1650 | mutex_lock(&vq->mutex); | |
1651 | events_missed = vs->vs_events_missed; | |
1652 | mutex_unlock(&vq->mutex); | |
1653 | if (put_user(events_missed, eventsp)) | |
1654 | return -EFAULT; | |
1655 | return 0; | |
057cbf49 | 1656 | case VHOST_GET_FEATURES: |
5dade710 | 1657 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1658 | if (copy_to_user(featurep, &features, sizeof features)) |
1659 | return -EFAULT; | |
1660 | return 0; | |
1661 | case VHOST_SET_FEATURES: | |
1662 | if (copy_from_user(&features, featurep, sizeof features)) | |
1663 | return -EFAULT; | |
1664 | return vhost_scsi_set_features(vs, features); | |
1665 | default: | |
1666 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1667 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1668 | /* TODO: flush backend after dev ioctl. */ | |
1669 | if (r == -ENOIOCTLCMD) | |
1670 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1671 | mutex_unlock(&vs->dev.mutex); |
1672 | return r; | |
1673 | } | |
1674 | } | |
1675 | ||
101998f6 NB |
1676 | #ifdef CONFIG_COMPAT |
1677 | static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, | |
1678 | unsigned long arg) | |
1679 | { | |
1680 | return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1681 | } | |
1682 | #endif | |
1683 | ||
057cbf49 NB |
1684 | static const struct file_operations vhost_scsi_fops = { |
1685 | .owner = THIS_MODULE, | |
1686 | .release = vhost_scsi_release, | |
1687 | .unlocked_ioctl = vhost_scsi_ioctl, | |
101998f6 NB |
1688 | #ifdef CONFIG_COMPAT |
1689 | .compat_ioctl = vhost_scsi_compat_ioctl, | |
1690 | #endif | |
057cbf49 NB |
1691 | .open = vhost_scsi_open, |
1692 | .llseek = noop_llseek, | |
1693 | }; | |
1694 | ||
1695 | static struct miscdevice vhost_scsi_misc = { | |
1696 | MISC_DYNAMIC_MINOR, | |
1697 | "vhost-scsi", | |
1698 | &vhost_scsi_fops, | |
1699 | }; | |
1700 | ||
1701 | static int __init vhost_scsi_register(void) | |
1702 | { | |
1703 | return misc_register(&vhost_scsi_misc); | |
1704 | } | |
1705 | ||
1706 | static int vhost_scsi_deregister(void) | |
1707 | { | |
1708 | return misc_deregister(&vhost_scsi_misc); | |
1709 | } | |
1710 | ||
1711 | static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport) | |
1712 | { | |
1713 | switch (tport->tport_proto_id) { | |
1714 | case SCSI_PROTOCOL_SAS: | |
1715 | return "SAS"; | |
1716 | case SCSI_PROTOCOL_FCP: | |
1717 | return "FCP"; | |
1718 | case SCSI_PROTOCOL_ISCSI: | |
1719 | return "iSCSI"; | |
1720 | default: | |
1721 | break; | |
1722 | } | |
1723 | ||
1724 | return "Unknown"; | |
1725 | } | |
1726 | ||
683bd967 AH |
1727 | static void |
1728 | tcm_vhost_do_plug(struct tcm_vhost_tpg *tpg, | |
1729 | struct se_lun *lun, bool plug) | |
a6c9af87 AH |
1730 | { |
1731 | ||
1732 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1733 | struct vhost_virtqueue *vq; | |
1734 | u32 reason; | |
1735 | ||
1736 | if (!vs) | |
1737 | return; | |
1738 | ||
1739 | mutex_lock(&vs->dev.mutex); | |
a6c9af87 AH |
1740 | |
1741 | if (plug) | |
1742 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1743 | else | |
1744 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1745 | ||
3ab2e420 | 1746 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 | 1747 | mutex_lock(&vq->mutex); |
ea16c514 MT |
1748 | if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG)) |
1749 | tcm_vhost_send_evt(vs, tpg, lun, | |
1750 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); | |
a6c9af87 AH |
1751 | mutex_unlock(&vq->mutex); |
1752 | mutex_unlock(&vs->dev.mutex); | |
1753 | } | |
1754 | ||
1755 | static void tcm_vhost_hotplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun) | |
1756 | { | |
1757 | tcm_vhost_do_plug(tpg, lun, true); | |
1758 | } | |
1759 | ||
1760 | static void tcm_vhost_hotunplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun) | |
1761 | { | |
1762 | tcm_vhost_do_plug(tpg, lun, false); | |
1763 | } | |
1764 | ||
101998f6 | 1765 | static int tcm_vhost_port_link(struct se_portal_group *se_tpg, |
683bd967 | 1766 | struct se_lun *lun) |
057cbf49 | 1767 | { |
98718312 | 1768 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, |
057cbf49 NB |
1769 | struct tcm_vhost_tpg, se_tpg); |
1770 | ||
a6c9af87 AH |
1771 | mutex_lock(&tcm_vhost_mutex); |
1772 | ||
98718312 AH |
1773 | mutex_lock(&tpg->tv_tpg_mutex); |
1774 | tpg->tv_tpg_port_count++; | |
1775 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 | 1776 | |
98718312 | 1777 | tcm_vhost_hotplug(tpg, lun); |
a6c9af87 AH |
1778 | |
1779 | mutex_unlock(&tcm_vhost_mutex); | |
1780 | ||
057cbf49 NB |
1781 | return 0; |
1782 | } | |
1783 | ||
101998f6 | 1784 | static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg, |
683bd967 | 1785 | struct se_lun *lun) |
057cbf49 | 1786 | { |
98718312 | 1787 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, |
057cbf49 NB |
1788 | struct tcm_vhost_tpg, se_tpg); |
1789 | ||
a6c9af87 AH |
1790 | mutex_lock(&tcm_vhost_mutex); |
1791 | ||
98718312 AH |
1792 | mutex_lock(&tpg->tv_tpg_mutex); |
1793 | tpg->tv_tpg_port_count--; | |
1794 | mutex_unlock(&tpg->tv_tpg_mutex); | |
a6c9af87 | 1795 | |
98718312 | 1796 | tcm_vhost_hotunplug(tpg, lun); |
a6c9af87 AH |
1797 | |
1798 | mutex_unlock(&tcm_vhost_mutex); | |
057cbf49 NB |
1799 | } |
1800 | ||
683bd967 AH |
1801 | static struct se_node_acl * |
1802 | tcm_vhost_make_nodeacl(struct se_portal_group *se_tpg, | |
1803 | struct config_group *group, | |
1804 | const char *name) | |
057cbf49 NB |
1805 | { |
1806 | struct se_node_acl *se_nacl, *se_nacl_new; | |
1807 | struct tcm_vhost_nacl *nacl; | |
1808 | u64 wwpn = 0; | |
1809 | u32 nexus_depth; | |
1810 | ||
1811 | /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0) | |
1812 | return ERR_PTR(-EINVAL); */ | |
1813 | se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg); | |
1814 | if (!se_nacl_new) | |
1815 | return ERR_PTR(-ENOMEM); | |
1816 | ||
1817 | nexus_depth = 1; | |
1818 | /* | |
1819 | * se_nacl_new may be released by core_tpg_add_initiator_node_acl() | |
1820 | * when converting a NodeACL from demo mode -> explict | |
1821 | */ | |
1822 | se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new, | |
1823 | name, nexus_depth); | |
1824 | if (IS_ERR(se_nacl)) { | |
1825 | tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new); | |
1826 | return se_nacl; | |
1827 | } | |
1828 | /* | |
1829 | * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN | |
1830 | */ | |
1831 | nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl); | |
1832 | nacl->iport_wwpn = wwpn; | |
1833 | ||
1834 | return se_nacl; | |
1835 | } | |
1836 | ||
1837 | static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl) | |
1838 | { | |
1839 | struct tcm_vhost_nacl *nacl = container_of(se_acl, | |
1840 | struct tcm_vhost_nacl, se_node_acl); | |
1841 | core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1); | |
1842 | kfree(nacl); | |
1843 | } | |
1844 | ||
3aee26b4 NB |
1845 | static void tcm_vhost_free_cmd_map_res(struct tcm_vhost_nexus *nexus, |
1846 | struct se_session *se_sess) | |
1847 | { | |
1848 | struct tcm_vhost_cmd *tv_cmd; | |
1849 | unsigned int i; | |
1850 | ||
1851 | if (!se_sess->sess_cmd_map) | |
1852 | return; | |
1853 | ||
1854 | for (i = 0; i < TCM_VHOST_DEFAULT_TAGS; i++) { | |
1855 | tv_cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[i]; | |
1856 | ||
1857 | kfree(tv_cmd->tvc_sgl); | |
b1935f68 | 1858 | kfree(tv_cmd->tvc_prot_sgl); |
3aee26b4 NB |
1859 | kfree(tv_cmd->tvc_upages); |
1860 | } | |
1861 | } | |
1862 | ||
98718312 | 1863 | static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tpg, |
683bd967 | 1864 | const char *name) |
057cbf49 NB |
1865 | { |
1866 | struct se_portal_group *se_tpg; | |
3aee26b4 | 1867 | struct se_session *se_sess; |
057cbf49 | 1868 | struct tcm_vhost_nexus *tv_nexus; |
3aee26b4 NB |
1869 | struct tcm_vhost_cmd *tv_cmd; |
1870 | unsigned int i; | |
057cbf49 | 1871 | |
98718312 AH |
1872 | mutex_lock(&tpg->tv_tpg_mutex); |
1873 | if (tpg->tpg_nexus) { | |
1874 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1875 | pr_debug("tpg->tpg_nexus already exists\n"); | |
057cbf49 NB |
1876 | return -EEXIST; |
1877 | } | |
98718312 | 1878 | se_tpg = &tpg->se_tpg; |
057cbf49 NB |
1879 | |
1880 | tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL); | |
1881 | if (!tv_nexus) { | |
98718312 | 1882 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1883 | pr_err("Unable to allocate struct tcm_vhost_nexus\n"); |
1884 | return -ENOMEM; | |
1885 | } | |
1886 | /* | |
4824d3bf NB |
1887 | * Initialize the struct se_session pointer and setup tagpool |
1888 | * for struct tcm_vhost_cmd descriptors | |
057cbf49 | 1889 | */ |
4824d3bf NB |
1890 | tv_nexus->tvn_se_sess = transport_init_session_tags( |
1891 | TCM_VHOST_DEFAULT_TAGS, | |
e70beee7 | 1892 | sizeof(struct tcm_vhost_cmd), |
95e7c434 | 1893 | TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS); |
057cbf49 | 1894 | if (IS_ERR(tv_nexus->tvn_se_sess)) { |
98718312 | 1895 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1896 | kfree(tv_nexus); |
1897 | return -ENOMEM; | |
1898 | } | |
3aee26b4 NB |
1899 | se_sess = tv_nexus->tvn_se_sess; |
1900 | for (i = 0; i < TCM_VHOST_DEFAULT_TAGS; i++) { | |
1901 | tv_cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[i]; | |
1902 | ||
1903 | tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) * | |
1904 | TCM_VHOST_PREALLOC_SGLS, GFP_KERNEL); | |
1905 | if (!tv_cmd->tvc_sgl) { | |
1906 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1907 | pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); | |
1908 | goto out; | |
1909 | } | |
1910 | ||
1911 | tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) * | |
5a01d082 | 1912 | TCM_VHOST_PREALLOC_UPAGES, GFP_KERNEL); |
3aee26b4 NB |
1913 | if (!tv_cmd->tvc_upages) { |
1914 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1915 | pr_err("Unable to allocate tv_cmd->tvc_upages\n"); | |
1916 | goto out; | |
1917 | } | |
b1935f68 NB |
1918 | |
1919 | tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) * | |
1920 | TCM_VHOST_PREALLOC_PROT_SGLS, GFP_KERNEL); | |
1921 | if (!tv_cmd->tvc_prot_sgl) { | |
1922 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1923 | pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); | |
1924 | goto out; | |
1925 | } | |
3aee26b4 | 1926 | } |
057cbf49 NB |
1927 | /* |
1928 | * Since we are running in 'demo mode' this call with generate a | |
1929 | * struct se_node_acl for the tcm_vhost struct se_portal_group with | |
1930 | * the SCSI Initiator port name of the passed configfs group 'name'. | |
1931 | */ | |
1932 | tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
1933 | se_tpg, (unsigned char *)name); | |
1934 | if (!tv_nexus->tvn_se_sess->se_node_acl) { | |
98718312 | 1935 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1936 | pr_debug("core_tpg_check_initiator_node_acl() failed" |
1937 | " for %s\n", name); | |
3aee26b4 | 1938 | goto out; |
057cbf49 NB |
1939 | } |
1940 | /* | |
101998f6 | 1941 | * Now register the TCM vhost virtual I_T Nexus as active with the |
057cbf49 NB |
1942 | * call to __transport_register_session() |
1943 | */ | |
1944 | __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl, | |
1945 | tv_nexus->tvn_se_sess, tv_nexus); | |
98718312 | 1946 | tpg->tpg_nexus = tv_nexus; |
057cbf49 | 1947 | |
98718312 | 1948 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1949 | return 0; |
3aee26b4 NB |
1950 | |
1951 | out: | |
1952 | tcm_vhost_free_cmd_map_res(tv_nexus, se_sess); | |
1953 | transport_free_session(se_sess); | |
1954 | kfree(tv_nexus); | |
1955 | return -ENOMEM; | |
057cbf49 NB |
1956 | } |
1957 | ||
101998f6 | 1958 | static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg *tpg) |
057cbf49 NB |
1959 | { |
1960 | struct se_session *se_sess; | |
1961 | struct tcm_vhost_nexus *tv_nexus; | |
1962 | ||
1963 | mutex_lock(&tpg->tv_tpg_mutex); | |
1964 | tv_nexus = tpg->tpg_nexus; | |
1965 | if (!tv_nexus) { | |
1966 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1967 | return -ENODEV; | |
1968 | } | |
1969 | ||
1970 | se_sess = tv_nexus->tvn_se_sess; | |
1971 | if (!se_sess) { | |
1972 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1973 | return -ENODEV; | |
1974 | } | |
1975 | ||
101998f6 | 1976 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 1977 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1978 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1979 | " active TPG port count: %d\n", |
101998f6 NB |
1980 | tpg->tv_tpg_port_count); |
1981 | return -EBUSY; | |
057cbf49 NB |
1982 | } |
1983 | ||
101998f6 | 1984 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 1985 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1986 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1987 | " active TPG vhost count: %d\n", |
101998f6 NB |
1988 | tpg->tv_tpg_vhost_count); |
1989 | return -EBUSY; | |
057cbf49 NB |
1990 | } |
1991 | ||
101998f6 | 1992 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
057cbf49 NB |
1993 | " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport), |
1994 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
3aee26b4 NB |
1995 | |
1996 | tcm_vhost_free_cmd_map_res(tv_nexus, se_sess); | |
057cbf49 | 1997 | /* |
101998f6 | 1998 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 NB |
1999 | */ |
2000 | transport_deregister_session(tv_nexus->tvn_se_sess); | |
2001 | tpg->tpg_nexus = NULL; | |
2002 | mutex_unlock(&tpg->tv_tpg_mutex); | |
2003 | ||
2004 | kfree(tv_nexus); | |
2005 | return 0; | |
2006 | } | |
2007 | ||
101998f6 | 2008 | static ssize_t tcm_vhost_tpg_show_nexus(struct se_portal_group *se_tpg, |
683bd967 | 2009 | char *page) |
057cbf49 | 2010 | { |
98718312 | 2011 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, |
057cbf49 NB |
2012 | struct tcm_vhost_tpg, se_tpg); |
2013 | struct tcm_vhost_nexus *tv_nexus; | |
2014 | ssize_t ret; | |
2015 | ||
98718312 AH |
2016 | mutex_lock(&tpg->tv_tpg_mutex); |
2017 | tv_nexus = tpg->tpg_nexus; | |
057cbf49 | 2018 | if (!tv_nexus) { |
98718312 | 2019 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2020 | return -ENODEV; |
2021 | } | |
2022 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
2023 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
98718312 | 2024 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
2025 | |
2026 | return ret; | |
2027 | } | |
2028 | ||
101998f6 | 2029 | static ssize_t tcm_vhost_tpg_store_nexus(struct se_portal_group *se_tpg, |
683bd967 AH |
2030 | const char *page, |
2031 | size_t count) | |
057cbf49 | 2032 | { |
98718312 | 2033 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, |
057cbf49 | 2034 | struct tcm_vhost_tpg, se_tpg); |
98718312 | 2035 | struct tcm_vhost_tport *tport_wwn = tpg->tport; |
057cbf49 NB |
2036 | unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr; |
2037 | int ret; | |
2038 | /* | |
2039 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
2040 | */ | |
2041 | if (!strncmp(page, "NULL", 4)) { | |
98718312 | 2042 | ret = tcm_vhost_drop_nexus(tpg); |
057cbf49 NB |
2043 | return (!ret) ? count : ret; |
2044 | } | |
2045 | /* | |
2046 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
2047 | * the fabric protocol_id set in tcm_vhost_make_tport(), and call | |
2048 | * tcm_vhost_make_nexus(). | |
2049 | */ | |
2050 | if (strlen(page) >= TCM_VHOST_NAMELEN) { | |
2051 | pr_err("Emulated NAA Sas Address: %s, exceeds" | |
2052 | " max: %d\n", page, TCM_VHOST_NAMELEN); | |
2053 | return -EINVAL; | |
2054 | } | |
2055 | snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page); | |
2056 | ||
2057 | ptr = strstr(i_port, "naa."); | |
2058 | if (ptr) { | |
2059 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
2060 | pr_err("Passed SAS Initiator Port %s does not" | |
2061 | " match target port protoid: %s\n", i_port, | |
2062 | tcm_vhost_dump_proto_id(tport_wwn)); | |
2063 | return -EINVAL; | |
2064 | } | |
2065 | port_ptr = &i_port[0]; | |
2066 | goto check_newline; | |
2067 | } | |
2068 | ptr = strstr(i_port, "fc."); | |
2069 | if (ptr) { | |
2070 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
2071 | pr_err("Passed FCP Initiator Port %s does not" | |
2072 | " match target port protoid: %s\n", i_port, | |
2073 | tcm_vhost_dump_proto_id(tport_wwn)); | |
2074 | return -EINVAL; | |
2075 | } | |
2076 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
2077 | goto check_newline; | |
2078 | } | |
2079 | ptr = strstr(i_port, "iqn."); | |
2080 | if (ptr) { | |
2081 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
2082 | pr_err("Passed iSCSI Initiator Port %s does not" | |
2083 | " match target port protoid: %s\n", i_port, | |
2084 | tcm_vhost_dump_proto_id(tport_wwn)); | |
2085 | return -EINVAL; | |
2086 | } | |
2087 | port_ptr = &i_port[0]; | |
2088 | goto check_newline; | |
2089 | } | |
2090 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
2091 | " %s\n", i_port); | |
2092 | return -EINVAL; | |
2093 | /* | |
2094 | * Clear any trailing newline for the NAA WWN | |
2095 | */ | |
2096 | check_newline: | |
2097 | if (i_port[strlen(i_port)-1] == '\n') | |
2098 | i_port[strlen(i_port)-1] = '\0'; | |
2099 | ||
98718312 | 2100 | ret = tcm_vhost_make_nexus(tpg, port_ptr); |
057cbf49 NB |
2101 | if (ret < 0) |
2102 | return ret; | |
2103 | ||
2104 | return count; | |
2105 | } | |
2106 | ||
2107 | TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR); | |
2108 | ||
2109 | static struct configfs_attribute *tcm_vhost_tpg_attrs[] = { | |
2110 | &tcm_vhost_tpg_nexus.attr, | |
2111 | NULL, | |
2112 | }; | |
2113 | ||
683bd967 AH |
2114 | static struct se_portal_group * |
2115 | tcm_vhost_make_tpg(struct se_wwn *wwn, | |
2116 | struct config_group *group, | |
2117 | const char *name) | |
057cbf49 NB |
2118 | { |
2119 | struct tcm_vhost_tport *tport = container_of(wwn, | |
2120 | struct tcm_vhost_tport, tport_wwn); | |
2121 | ||
2122 | struct tcm_vhost_tpg *tpg; | |
2123 | unsigned long tpgt; | |
2124 | int ret; | |
2125 | ||
2126 | if (strstr(name, "tpgt_") != name) | |
2127 | return ERR_PTR(-EINVAL); | |
2128 | if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX) | |
2129 | return ERR_PTR(-EINVAL); | |
2130 | ||
2131 | tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL); | |
2132 | if (!tpg) { | |
2133 | pr_err("Unable to allocate struct tcm_vhost_tpg"); | |
2134 | return ERR_PTR(-ENOMEM); | |
2135 | } | |
2136 | mutex_init(&tpg->tv_tpg_mutex); | |
2137 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
2138 | tpg->tport = tport; | |
2139 | tpg->tport_tpgt = tpgt; | |
2140 | ||
2141 | ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn, | |
2142 | &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL); | |
2143 | if (ret < 0) { | |
2144 | kfree(tpg); | |
2145 | return NULL; | |
2146 | } | |
2147 | mutex_lock(&tcm_vhost_mutex); | |
2148 | list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list); | |
2149 | mutex_unlock(&tcm_vhost_mutex); | |
2150 | ||
2151 | return &tpg->se_tpg; | |
2152 | } | |
2153 | ||
2154 | static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg) | |
2155 | { | |
2156 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
2157 | struct tcm_vhost_tpg, se_tpg); | |
2158 | ||
2159 | mutex_lock(&tcm_vhost_mutex); | |
2160 | list_del(&tpg->tv_tpg_list); | |
2161 | mutex_unlock(&tcm_vhost_mutex); | |
2162 | /* | |
101998f6 | 2163 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 NB |
2164 | */ |
2165 | tcm_vhost_drop_nexus(tpg); | |
2166 | /* | |
2167 | * Deregister the se_tpg from TCM.. | |
2168 | */ | |
2169 | core_tpg_deregister(se_tpg); | |
2170 | kfree(tpg); | |
2171 | } | |
2172 | ||
683bd967 AH |
2173 | static struct se_wwn * |
2174 | tcm_vhost_make_tport(struct target_fabric_configfs *tf, | |
2175 | struct config_group *group, | |
2176 | const char *name) | |
057cbf49 NB |
2177 | { |
2178 | struct tcm_vhost_tport *tport; | |
2179 | char *ptr; | |
2180 | u64 wwpn = 0; | |
2181 | int off = 0; | |
2182 | ||
2183 | /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0) | |
2184 | return ERR_PTR(-EINVAL); */ | |
2185 | ||
2186 | tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL); | |
2187 | if (!tport) { | |
2188 | pr_err("Unable to allocate struct tcm_vhost_tport"); | |
2189 | return ERR_PTR(-ENOMEM); | |
2190 | } | |
2191 | tport->tport_wwpn = wwpn; | |
2192 | /* | |
2193 | * Determine the emulated Protocol Identifier and Target Port Name | |
2194 | * based on the incoming configfs directory name. | |
2195 | */ | |
2196 | ptr = strstr(name, "naa."); | |
2197 | if (ptr) { | |
2198 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
2199 | goto check_len; | |
2200 | } | |
2201 | ptr = strstr(name, "fc."); | |
2202 | if (ptr) { | |
2203 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
2204 | off = 3; /* Skip over "fc." */ | |
2205 | goto check_len; | |
2206 | } | |
2207 | ptr = strstr(name, "iqn."); | |
2208 | if (ptr) { | |
2209 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
2210 | goto check_len; | |
2211 | } | |
2212 | ||
2213 | pr_err("Unable to locate prefix for emulated Target Port:" | |
2214 | " %s\n", name); | |
2215 | kfree(tport); | |
2216 | return ERR_PTR(-EINVAL); | |
2217 | ||
2218 | check_len: | |
2219 | if (strlen(name) >= TCM_VHOST_NAMELEN) { | |
2220 | pr_err("Emulated %s Address: %s, exceeds" | |
2221 | " max: %d\n", name, tcm_vhost_dump_proto_id(tport), | |
2222 | TCM_VHOST_NAMELEN); | |
2223 | kfree(tport); | |
2224 | return ERR_PTR(-EINVAL); | |
2225 | } | |
2226 | snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]); | |
2227 | ||
2228 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
2229 | " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name); | |
2230 | ||
2231 | return &tport->tport_wwn; | |
2232 | } | |
2233 | ||
2234 | static void tcm_vhost_drop_tport(struct se_wwn *wwn) | |
2235 | { | |
2236 | struct tcm_vhost_tport *tport = container_of(wwn, | |
2237 | struct tcm_vhost_tport, tport_wwn); | |
2238 | ||
2239 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
2240 | " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), | |
2241 | tport->tport_name); | |
2242 | ||
2243 | kfree(tport); | |
2244 | } | |
2245 | ||
683bd967 AH |
2246 | static ssize_t |
2247 | tcm_vhost_wwn_show_attr_version(struct target_fabric_configfs *tf, | |
2248 | char *page) | |
057cbf49 NB |
2249 | { |
2250 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" | |
2251 | "on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname, | |
2252 | utsname()->machine); | |
2253 | } | |
2254 | ||
2255 | TF_WWN_ATTR_RO(tcm_vhost, version); | |
2256 | ||
2257 | static struct configfs_attribute *tcm_vhost_wwn_attrs[] = { | |
2258 | &tcm_vhost_wwn_version.attr, | |
2259 | NULL, | |
2260 | }; | |
2261 | ||
2262 | static struct target_core_fabric_ops tcm_vhost_ops = { | |
2263 | .get_fabric_name = tcm_vhost_get_fabric_name, | |
2264 | .get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident, | |
2265 | .tpg_get_wwn = tcm_vhost_get_fabric_wwn, | |
2266 | .tpg_get_tag = tcm_vhost_get_tag, | |
2267 | .tpg_get_default_depth = tcm_vhost_get_default_depth, | |
2268 | .tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id, | |
2269 | .tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len, | |
2270 | .tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id, | |
2271 | .tpg_check_demo_mode = tcm_vhost_check_true, | |
2272 | .tpg_check_demo_mode_cache = tcm_vhost_check_true, | |
2273 | .tpg_check_demo_mode_write_protect = tcm_vhost_check_false, | |
2274 | .tpg_check_prod_mode_write_protect = tcm_vhost_check_false, | |
2275 | .tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl, | |
2276 | .tpg_release_fabric_acl = tcm_vhost_release_fabric_acl, | |
2277 | .tpg_get_inst_index = tcm_vhost_tpg_get_inst_index, | |
2278 | .release_cmd = tcm_vhost_release_cmd, | |
084ed45b | 2279 | .check_stop_free = vhost_scsi_check_stop_free, |
057cbf49 NB |
2280 | .shutdown_session = tcm_vhost_shutdown_session, |
2281 | .close_session = tcm_vhost_close_session, | |
2282 | .sess_get_index = tcm_vhost_sess_get_index, | |
2283 | .sess_get_initiator_sid = NULL, | |
2284 | .write_pending = tcm_vhost_write_pending, | |
2285 | .write_pending_status = tcm_vhost_write_pending_status, | |
2286 | .set_default_node_attributes = tcm_vhost_set_default_node_attrs, | |
2287 | .get_task_tag = tcm_vhost_get_task_tag, | |
2288 | .get_cmd_state = tcm_vhost_get_cmd_state, | |
2289 | .queue_data_in = tcm_vhost_queue_data_in, | |
2290 | .queue_status = tcm_vhost_queue_status, | |
2291 | .queue_tm_rsp = tcm_vhost_queue_tm_rsp, | |
131e6abc | 2292 | .aborted_task = tcm_vhost_aborted_task, |
057cbf49 NB |
2293 | /* |
2294 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
2295 | */ | |
2296 | .fabric_make_wwn = tcm_vhost_make_tport, | |
2297 | .fabric_drop_wwn = tcm_vhost_drop_tport, | |
2298 | .fabric_make_tpg = tcm_vhost_make_tpg, | |
2299 | .fabric_drop_tpg = tcm_vhost_drop_tpg, | |
2300 | .fabric_post_link = tcm_vhost_port_link, | |
2301 | .fabric_pre_unlink = tcm_vhost_port_unlink, | |
2302 | .fabric_make_np = NULL, | |
2303 | .fabric_drop_np = NULL, | |
2304 | .fabric_make_nodeacl = tcm_vhost_make_nodeacl, | |
2305 | .fabric_drop_nodeacl = tcm_vhost_drop_nodeacl, | |
2306 | }; | |
2307 | ||
2308 | static int tcm_vhost_register_configfs(void) | |
2309 | { | |
2310 | struct target_fabric_configfs *fabric; | |
2311 | int ret; | |
2312 | ||
2313 | pr_debug("TCM_VHOST fabric module %s on %s/%s" | |
2314 | " on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname, | |
2315 | utsname()->machine); | |
2316 | /* | |
2317 | * Register the top level struct config_item_type with TCM core | |
2318 | */ | |
2319 | fabric = target_fabric_configfs_init(THIS_MODULE, "vhost"); | |
2320 | if (IS_ERR(fabric)) { | |
2321 | pr_err("target_fabric_configfs_init() failed\n"); | |
2322 | return PTR_ERR(fabric); | |
2323 | } | |
2324 | /* | |
2325 | * Setup fabric->tf_ops from our local tcm_vhost_ops | |
2326 | */ | |
2327 | fabric->tf_ops = tcm_vhost_ops; | |
2328 | /* | |
2329 | * Setup default attribute lists for various fabric->tf_cit_tmpl | |
2330 | */ | |
d80e224d AG |
2331 | fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs; |
2332 | fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs; | |
2333 | fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL; | |
2334 | fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL; | |
2335 | fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL; | |
2336 | fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL; | |
2337 | fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL; | |
2338 | fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL; | |
2339 | fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL; | |
057cbf49 NB |
2340 | /* |
2341 | * Register the fabric for use within TCM | |
2342 | */ | |
2343 | ret = target_fabric_configfs_register(fabric); | |
2344 | if (ret < 0) { | |
2345 | pr_err("target_fabric_configfs_register() failed" | |
2346 | " for TCM_VHOST\n"); | |
2347 | return ret; | |
2348 | } | |
2349 | /* | |
2350 | * Setup our local pointer to *fabric | |
2351 | */ | |
2352 | tcm_vhost_fabric_configfs = fabric; | |
2353 | pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n"); | |
2354 | return 0; | |
2355 | }; | |
2356 | ||
2357 | static void tcm_vhost_deregister_configfs(void) | |
2358 | { | |
2359 | if (!tcm_vhost_fabric_configfs) | |
2360 | return; | |
2361 | ||
2362 | target_fabric_configfs_deregister(tcm_vhost_fabric_configfs); | |
2363 | tcm_vhost_fabric_configfs = NULL; | |
2364 | pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n"); | |
2365 | }; | |
2366 | ||
2367 | static int __init tcm_vhost_init(void) | |
2368 | { | |
2369 | int ret = -ENOMEM; | |
101998f6 NB |
2370 | /* |
2371 | * Use our own dedicated workqueue for submitting I/O into | |
2372 | * target core to avoid contention within system_wq. | |
2373 | */ | |
057cbf49 NB |
2374 | tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0); |
2375 | if (!tcm_vhost_workqueue) | |
2376 | goto out; | |
2377 | ||
2378 | ret = vhost_scsi_register(); | |
2379 | if (ret < 0) | |
2380 | goto out_destroy_workqueue; | |
2381 | ||
2382 | ret = tcm_vhost_register_configfs(); | |
2383 | if (ret < 0) | |
2384 | goto out_vhost_scsi_deregister; | |
2385 | ||
2386 | return 0; | |
2387 | ||
2388 | out_vhost_scsi_deregister: | |
2389 | vhost_scsi_deregister(); | |
2390 | out_destroy_workqueue: | |
2391 | destroy_workqueue(tcm_vhost_workqueue); | |
2392 | out: | |
2393 | return ret; | |
2394 | }; | |
2395 | ||
2396 | static void tcm_vhost_exit(void) | |
2397 | { | |
2398 | tcm_vhost_deregister_configfs(); | |
2399 | vhost_scsi_deregister(); | |
2400 | destroy_workqueue(tcm_vhost_workqueue); | |
2401 | }; | |
2402 | ||
181c04a3 MT |
2403 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
2404 | MODULE_ALIAS("tcm_vhost"); | |
057cbf49 NB |
2405 | MODULE_LICENSE("GPL"); |
2406 | module_init(tcm_vhost_init); | |
2407 | module_exit(tcm_vhost_exit); |