Commit | Line | Data |
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057cbf49 NB |
1 | /******************************************************************************* |
2 | * Vhost kernel TCM fabric driver for virtio SCSI initiators | |
3 | * | |
4c76251e | 4 | * (C) Copyright 2010-2013 Datera, Inc. |
057cbf49 NB |
5 | * (C) Copyright 2010-2012 IBM Corp. |
6 | * | |
7 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. | |
8 | * | |
4c76251e | 9 | * Authors: Nicholas A. Bellinger <nab@daterainc.com> |
057cbf49 NB |
10 | * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | ****************************************************************************/ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/moduleparam.h> | |
26 | #include <generated/utsrelease.h> | |
27 | #include <linux/utsname.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/kthread.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/configfs.h> | |
34 | #include <linux/ctype.h> | |
35 | #include <linux/compat.h> | |
36 | #include <linux/eventfd.h> | |
057cbf49 NB |
37 | #include <linux/fs.h> |
38 | #include <linux/miscdevice.h> | |
39 | #include <asm/unaligned.h> | |
40 | #include <scsi/scsi.h> | |
41 | #include <scsi/scsi_tcq.h> | |
42 | #include <target/target_core_base.h> | |
43 | #include <target/target_core_fabric.h> | |
44 | #include <target/target_core_fabric_configfs.h> | |
45 | #include <target/target_core_configfs.h> | |
46 | #include <target/configfs_macros.h> | |
47 | #include <linux/vhost.h> | |
057cbf49 | 48 | #include <linux/virtio_scsi.h> |
9d6064a3 | 49 | #include <linux/llist.h> |
1b7f390e | 50 | #include <linux/bitmap.h> |
4824d3bf | 51 | #include <linux/percpu_ida.h> |
057cbf49 | 52 | |
057cbf49 | 53 | #include "vhost.h" |
5012a3a3 MT |
54 | |
55 | #define TCM_VHOST_VERSION "v0.1" | |
56 | #define TCM_VHOST_NAMELEN 256 | |
57 | #define TCM_VHOST_MAX_CDB_SIZE 32 | |
4824d3bf | 58 | #define TCM_VHOST_DEFAULT_TAGS 256 |
3aee26b4 | 59 | #define TCM_VHOST_PREALLOC_SGLS 2048 |
5a01d082 | 60 | #define TCM_VHOST_PREALLOC_UPAGES 2048 |
b1935f68 | 61 | #define TCM_VHOST_PREALLOC_PROT_SGLS 512 |
5012a3a3 MT |
62 | |
63 | struct vhost_scsi_inflight { | |
64 | /* Wait for the flush operation to finish */ | |
65 | struct completion comp; | |
66 | /* Refcount for the inflight reqs */ | |
67 | struct kref kref; | |
68 | }; | |
69 | ||
70 | struct tcm_vhost_cmd { | |
71 | /* Descriptor from vhost_get_vq_desc() for virt_queue segment */ | |
72 | int tvc_vq_desc; | |
73 | /* virtio-scsi initiator task attribute */ | |
74 | int tvc_task_attr; | |
75 | /* virtio-scsi initiator data direction */ | |
76 | enum dma_data_direction tvc_data_direction; | |
77 | /* Expected data transfer length from virtio-scsi header */ | |
78 | u32 tvc_exp_data_len; | |
79 | /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */ | |
80 | u64 tvc_tag; | |
81 | /* The number of scatterlists associated with this cmd */ | |
82 | u32 tvc_sgl_count; | |
e31885dd | 83 | u32 tvc_prot_sgl_count; |
5012a3a3 MT |
84 | /* Saved unpacked SCSI LUN for tcm_vhost_submission_work() */ |
85 | u32 tvc_lun; | |
86 | /* Pointer to the SGL formatted memory from virtio-scsi */ | |
87 | struct scatterlist *tvc_sgl; | |
b1935f68 | 88 | struct scatterlist *tvc_prot_sgl; |
3aee26b4 | 89 | struct page **tvc_upages; |
5012a3a3 MT |
90 | /* Pointer to response */ |
91 | struct virtio_scsi_cmd_resp __user *tvc_resp; | |
92 | /* Pointer to vhost_scsi for our device */ | |
93 | struct vhost_scsi *tvc_vhost; | |
94 | /* Pointer to vhost_virtqueue for the cmd */ | |
95 | struct vhost_virtqueue *tvc_vq; | |
96 | /* Pointer to vhost nexus memory */ | |
97 | struct tcm_vhost_nexus *tvc_nexus; | |
98 | /* The TCM I/O descriptor that is accessed via container_of() */ | |
99 | struct se_cmd tvc_se_cmd; | |
100 | /* work item used for cmwq dispatch to tcm_vhost_submission_work() */ | |
101 | struct work_struct work; | |
102 | /* Copy of the incoming SCSI command descriptor block (CDB) */ | |
103 | unsigned char tvc_cdb[TCM_VHOST_MAX_CDB_SIZE]; | |
104 | /* Sense buffer that will be mapped into outgoing status */ | |
105 | unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER]; | |
106 | /* Completed commands list, serviced from vhost worker thread */ | |
107 | struct llist_node tvc_completion_list; | |
108 | /* Used to track inflight cmd */ | |
109 | struct vhost_scsi_inflight *inflight; | |
110 | }; | |
111 | ||
112 | struct tcm_vhost_nexus { | |
113 | /* Pointer to TCM session for I_T Nexus */ | |
114 | struct se_session *tvn_se_sess; | |
115 | }; | |
116 | ||
117 | struct tcm_vhost_nacl { | |
118 | /* Binary World Wide unique Port Name for Vhost Initiator port */ | |
119 | u64 iport_wwpn; | |
120 | /* ASCII formatted WWPN for Sas Initiator port */ | |
121 | char iport_name[TCM_VHOST_NAMELEN]; | |
122 | /* Returned by tcm_vhost_make_nodeacl() */ | |
123 | struct se_node_acl se_node_acl; | |
124 | }; | |
125 | ||
5012a3a3 MT |
126 | struct tcm_vhost_tpg { |
127 | /* Vhost port target portal group tag for TCM */ | |
128 | u16 tport_tpgt; | |
129 | /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */ | |
130 | int tv_tpg_port_count; | |
131 | /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */ | |
132 | int tv_tpg_vhost_count; | |
133 | /* list for tcm_vhost_list */ | |
134 | struct list_head tv_tpg_list; | |
135 | /* Used to protect access for tpg_nexus */ | |
136 | struct mutex tv_tpg_mutex; | |
137 | /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */ | |
138 | struct tcm_vhost_nexus *tpg_nexus; | |
139 | /* Pointer back to tcm_vhost_tport */ | |
140 | struct tcm_vhost_tport *tport; | |
141 | /* Returned by tcm_vhost_make_tpg() */ | |
142 | struct se_portal_group se_tpg; | |
143 | /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */ | |
144 | struct vhost_scsi *vhost_scsi; | |
145 | }; | |
146 | ||
147 | struct tcm_vhost_tport { | |
148 | /* SCSI protocol the tport is providing */ | |
149 | u8 tport_proto_id; | |
150 | /* Binary World Wide unique Port Name for Vhost Target port */ | |
151 | u64 tport_wwpn; | |
152 | /* ASCII formatted WWPN for Vhost Target port */ | |
153 | char tport_name[TCM_VHOST_NAMELEN]; | |
154 | /* Returned by tcm_vhost_make_tport() */ | |
155 | struct se_wwn tport_wwn; | |
156 | }; | |
157 | ||
158 | struct tcm_vhost_evt { | |
159 | /* event to be sent to guest */ | |
160 | struct virtio_scsi_event event; | |
161 | /* event list, serviced from vhost worker thread */ | |
162 | struct llist_node list; | |
163 | }; | |
057cbf49 | 164 | |
101998f6 NB |
165 | enum { |
166 | VHOST_SCSI_VQ_CTL = 0, | |
167 | VHOST_SCSI_VQ_EVT = 1, | |
168 | VHOST_SCSI_VQ_IO = 2, | |
169 | }; | |
170 | ||
5dade710 | 171 | enum { |
95e7c434 NB |
172 | VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) | |
173 | (1ULL << VIRTIO_SCSI_F_T10_PI) | |
5dade710 NB |
174 | }; |
175 | ||
1b7f390e AH |
176 | #define VHOST_SCSI_MAX_TARGET 256 |
177 | #define VHOST_SCSI_MAX_VQ 128 | |
a6c9af87 | 178 | #define VHOST_SCSI_MAX_EVENT 128 |
67e18cf9 | 179 | |
3ab2e420 AH |
180 | struct vhost_scsi_virtqueue { |
181 | struct vhost_virtqueue vq; | |
3dfbff32 MT |
182 | /* |
183 | * Reference counting for inflight reqs, used for flush operation. At | |
184 | * each time, one reference tracks new commands submitted, while we | |
185 | * wait for another one to reach 0. | |
186 | */ | |
f2f0173d | 187 | struct vhost_scsi_inflight inflights[2]; |
3dfbff32 MT |
188 | /* |
189 | * Indicate current inflight in use, protected by vq->mutex. | |
190 | * Writers must also take dev mutex and flush under it. | |
191 | */ | |
f2f0173d | 192 | int inflight_idx; |
3ab2e420 AH |
193 | }; |
194 | ||
057cbf49 | 195 | struct vhost_scsi { |
67e18cf9 | 196 | /* Protected by vhost_scsi->dev.mutex */ |
4f7f46d3 | 197 | struct tcm_vhost_tpg **vs_tpg; |
67e18cf9 | 198 | char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
67e18cf9 | 199 | |
057cbf49 | 200 | struct vhost_dev dev; |
3ab2e420 | 201 | struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ]; |
057cbf49 NB |
202 | |
203 | struct vhost_work vs_completion_work; /* cmd completion work item */ | |
9d6064a3 | 204 | struct llist_head vs_completion_list; /* cmd completion queue */ |
a6c9af87 AH |
205 | |
206 | struct vhost_work vs_event_work; /* evt injection work item */ | |
207 | struct llist_head vs_event_list; /* evt injection queue */ | |
208 | ||
209 | bool vs_events_missed; /* any missed events, protected by vq->mutex */ | |
210 | int vs_events_nr; /* num of pending events, protected by vq->mutex */ | |
057cbf49 NB |
211 | }; |
212 | ||
213 | /* Local pointer to allocated TCM configfs fabric module */ | |
214 | static struct target_fabric_configfs *tcm_vhost_fabric_configfs; | |
215 | ||
216 | static struct workqueue_struct *tcm_vhost_workqueue; | |
217 | ||
218 | /* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */ | |
219 | static DEFINE_MUTEX(tcm_vhost_mutex); | |
220 | static LIST_HEAD(tcm_vhost_list); | |
221 | ||
765b34fd AH |
222 | static int iov_num_pages(struct iovec *iov) |
223 | { | |
224 | return (PAGE_ALIGN((unsigned long)iov->iov_base + iov->iov_len) - | |
225 | ((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT; | |
226 | } | |
227 | ||
0a1febf7 | 228 | static void tcm_vhost_done_inflight(struct kref *kref) |
f2f0173d AH |
229 | { |
230 | struct vhost_scsi_inflight *inflight; | |
231 | ||
232 | inflight = container_of(kref, struct vhost_scsi_inflight, kref); | |
233 | complete(&inflight->comp); | |
234 | } | |
235 | ||
236 | static void tcm_vhost_init_inflight(struct vhost_scsi *vs, | |
237 | struct vhost_scsi_inflight *old_inflight[]) | |
238 | { | |
239 | struct vhost_scsi_inflight *new_inflight; | |
240 | struct vhost_virtqueue *vq; | |
241 | int idx, i; | |
242 | ||
243 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
244 | vq = &vs->vqs[i].vq; | |
245 | ||
246 | mutex_lock(&vq->mutex); | |
247 | ||
248 | /* store old infight */ | |
249 | idx = vs->vqs[i].inflight_idx; | |
250 | if (old_inflight) | |
251 | old_inflight[i] = &vs->vqs[i].inflights[idx]; | |
252 | ||
253 | /* setup new infight */ | |
254 | vs->vqs[i].inflight_idx = idx ^ 1; | |
255 | new_inflight = &vs->vqs[i].inflights[idx ^ 1]; | |
256 | kref_init(&new_inflight->kref); | |
257 | init_completion(&new_inflight->comp); | |
258 | ||
259 | mutex_unlock(&vq->mutex); | |
260 | } | |
261 | } | |
262 | ||
263 | static struct vhost_scsi_inflight * | |
264 | tcm_vhost_get_inflight(struct vhost_virtqueue *vq) | |
265 | { | |
266 | struct vhost_scsi_inflight *inflight; | |
267 | struct vhost_scsi_virtqueue *svq; | |
268 | ||
269 | svq = container_of(vq, struct vhost_scsi_virtqueue, vq); | |
270 | inflight = &svq->inflights[svq->inflight_idx]; | |
271 | kref_get(&inflight->kref); | |
272 | ||
273 | return inflight; | |
274 | } | |
275 | ||
276 | static void tcm_vhost_put_inflight(struct vhost_scsi_inflight *inflight) | |
277 | { | |
278 | kref_put(&inflight->kref, tcm_vhost_done_inflight); | |
279 | } | |
280 | ||
057cbf49 NB |
281 | static int tcm_vhost_check_true(struct se_portal_group *se_tpg) |
282 | { | |
283 | return 1; | |
284 | } | |
285 | ||
286 | static int tcm_vhost_check_false(struct se_portal_group *se_tpg) | |
287 | { | |
288 | return 0; | |
289 | } | |
290 | ||
291 | static char *tcm_vhost_get_fabric_name(void) | |
292 | { | |
293 | return "vhost"; | |
294 | } | |
295 | ||
296 | static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg) | |
297 | { | |
298 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
299 | struct tcm_vhost_tpg, se_tpg); | |
300 | struct tcm_vhost_tport *tport = tpg->tport; | |
301 | ||
302 | switch (tport->tport_proto_id) { | |
303 | case SCSI_PROTOCOL_SAS: | |
304 | return sas_get_fabric_proto_ident(se_tpg); | |
305 | case SCSI_PROTOCOL_FCP: | |
306 | return fc_get_fabric_proto_ident(se_tpg); | |
307 | case SCSI_PROTOCOL_ISCSI: | |
308 | return iscsi_get_fabric_proto_ident(se_tpg); | |
309 | default: | |
310 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
311 | " SAS emulation\n", tport->tport_proto_id); | |
312 | break; | |
313 | } | |
314 | ||
315 | return sas_get_fabric_proto_ident(se_tpg); | |
316 | } | |
317 | ||
318 | static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg) | |
319 | { | |
320 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
321 | struct tcm_vhost_tpg, se_tpg); | |
322 | struct tcm_vhost_tport *tport = tpg->tport; | |
323 | ||
324 | return &tport->tport_name[0]; | |
325 | } | |
326 | ||
327 | static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg) | |
328 | { | |
329 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
330 | struct tcm_vhost_tpg, se_tpg); | |
331 | return tpg->tport_tpgt; | |
332 | } | |
333 | ||
334 | static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg) | |
335 | { | |
336 | return 1; | |
337 | } | |
338 | ||
683bd967 AH |
339 | static u32 |
340 | tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg, | |
341 | struct se_node_acl *se_nacl, | |
342 | struct t10_pr_registration *pr_reg, | |
343 | int *format_code, | |
344 | unsigned char *buf) | |
057cbf49 NB |
345 | { |
346 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
347 | struct tcm_vhost_tpg, se_tpg); | |
348 | struct tcm_vhost_tport *tport = tpg->tport; | |
349 | ||
350 | switch (tport->tport_proto_id) { | |
351 | case SCSI_PROTOCOL_SAS: | |
352 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
353 | format_code, buf); | |
354 | case SCSI_PROTOCOL_FCP: | |
355 | return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
356 | format_code, buf); | |
357 | case SCSI_PROTOCOL_ISCSI: | |
358 | return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
359 | format_code, buf); | |
360 | default: | |
361 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
362 | " SAS emulation\n", tport->tport_proto_id); | |
363 | break; | |
364 | } | |
365 | ||
366 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
367 | format_code, buf); | |
368 | } | |
369 | ||
683bd967 AH |
370 | static u32 |
371 | tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg, | |
372 | struct se_node_acl *se_nacl, | |
373 | struct t10_pr_registration *pr_reg, | |
374 | int *format_code) | |
057cbf49 NB |
375 | { |
376 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
377 | struct tcm_vhost_tpg, se_tpg); | |
378 | struct tcm_vhost_tport *tport = tpg->tport; | |
379 | ||
380 | switch (tport->tport_proto_id) { | |
381 | case SCSI_PROTOCOL_SAS: | |
382 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
383 | format_code); | |
384 | case SCSI_PROTOCOL_FCP: | |
385 | return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
386 | format_code); | |
387 | case SCSI_PROTOCOL_ISCSI: | |
388 | return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
389 | format_code); | |
390 | default: | |
391 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
392 | " SAS emulation\n", tport->tport_proto_id); | |
393 | break; | |
394 | } | |
395 | ||
396 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
397 | format_code); | |
398 | } | |
399 | ||
683bd967 AH |
400 | static char * |
401 | tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg, | |
402 | const char *buf, | |
403 | u32 *out_tid_len, | |
404 | char **port_nexus_ptr) | |
057cbf49 NB |
405 | { |
406 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
407 | struct tcm_vhost_tpg, se_tpg); | |
408 | struct tcm_vhost_tport *tport = tpg->tport; | |
409 | ||
410 | switch (tport->tport_proto_id) { | |
411 | case SCSI_PROTOCOL_SAS: | |
412 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
413 | port_nexus_ptr); | |
414 | case SCSI_PROTOCOL_FCP: | |
415 | return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
416 | port_nexus_ptr); | |
417 | case SCSI_PROTOCOL_ISCSI: | |
418 | return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
419 | port_nexus_ptr); | |
420 | default: | |
421 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
422 | " SAS emulation\n", tport->tport_proto_id); | |
423 | break; | |
424 | } | |
425 | ||
426 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
427 | port_nexus_ptr); | |
428 | } | |
429 | ||
683bd967 AH |
430 | static struct se_node_acl * |
431 | tcm_vhost_alloc_fabric_acl(struct se_portal_group *se_tpg) | |
057cbf49 NB |
432 | { |
433 | struct tcm_vhost_nacl *nacl; | |
434 | ||
435 | nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL); | |
436 | if (!nacl) { | |
744627e9 | 437 | pr_err("Unable to allocate struct tcm_vhost_nacl\n"); |
057cbf49 NB |
438 | return NULL; |
439 | } | |
440 | ||
441 | return &nacl->se_node_acl; | |
442 | } | |
443 | ||
683bd967 AH |
444 | static void |
445 | tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg, | |
446 | struct se_node_acl *se_nacl) | |
057cbf49 NB |
447 | { |
448 | struct tcm_vhost_nacl *nacl = container_of(se_nacl, | |
449 | struct tcm_vhost_nacl, se_node_acl); | |
450 | kfree(nacl); | |
451 | } | |
452 | ||
453 | static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg) | |
454 | { | |
455 | return 1; | |
456 | } | |
457 | ||
458 | static void tcm_vhost_release_cmd(struct se_cmd *se_cmd) | |
459 | { | |
084ed45b NB |
460 | struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd, |
461 | struct tcm_vhost_cmd, tvc_se_cmd); | |
4824d3bf | 462 | struct se_session *se_sess = se_cmd->se_sess; |
e31885dd | 463 | int i; |
084ed45b NB |
464 | |
465 | if (tv_cmd->tvc_sgl_count) { | |
084ed45b NB |
466 | for (i = 0; i < tv_cmd->tvc_sgl_count; i++) |
467 | put_page(sg_page(&tv_cmd->tvc_sgl[i])); | |
d3d665a6 | 468 | } |
e31885dd NB |
469 | if (tv_cmd->tvc_prot_sgl_count) { |
470 | for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++) | |
471 | put_page(sg_page(&tv_cmd->tvc_prot_sgl[i])); | |
472 | } | |
084ed45b NB |
473 | |
474 | tcm_vhost_put_inflight(tv_cmd->inflight); | |
4824d3bf | 475 | percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag); |
057cbf49 NB |
476 | } |
477 | ||
478 | static int tcm_vhost_shutdown_session(struct se_session *se_sess) | |
479 | { | |
480 | return 0; | |
481 | } | |
482 | ||
483 | static void tcm_vhost_close_session(struct se_session *se_sess) | |
484 | { | |
485 | return; | |
486 | } | |
487 | ||
488 | static u32 tcm_vhost_sess_get_index(struct se_session *se_sess) | |
489 | { | |
490 | return 0; | |
491 | } | |
492 | ||
493 | static int tcm_vhost_write_pending(struct se_cmd *se_cmd) | |
494 | { | |
495 | /* Go ahead and process the write immediately */ | |
496 | target_execute_cmd(se_cmd); | |
497 | return 0; | |
498 | } | |
499 | ||
500 | static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd) | |
501 | { | |
502 | return 0; | |
503 | } | |
504 | ||
505 | static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl) | |
506 | { | |
507 | return; | |
508 | } | |
509 | ||
510 | static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd) | |
511 | { | |
512 | return 0; | |
513 | } | |
514 | ||
515 | static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd) | |
516 | { | |
517 | return 0; | |
518 | } | |
519 | ||
3c63f66a | 520 | static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *cmd) |
101998f6 | 521 | { |
3c63f66a | 522 | struct vhost_scsi *vs = cmd->tvc_vhost; |
101998f6 | 523 | |
3c63f66a | 524 | llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
101998f6 NB |
525 | |
526 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
527 | } | |
057cbf49 NB |
528 | |
529 | static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd) | |
530 | { | |
3c63f66a | 531 | struct tcm_vhost_cmd *cmd = container_of(se_cmd, |
057cbf49 | 532 | struct tcm_vhost_cmd, tvc_se_cmd); |
3c63f66a | 533 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
534 | return 0; |
535 | } | |
536 | ||
537 | static int tcm_vhost_queue_status(struct se_cmd *se_cmd) | |
538 | { | |
3c63f66a | 539 | struct tcm_vhost_cmd *cmd = container_of(se_cmd, |
057cbf49 | 540 | struct tcm_vhost_cmd, tvc_se_cmd); |
3c63f66a | 541 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
542 | return 0; |
543 | } | |
544 | ||
b79fafac | 545 | static void tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd) |
057cbf49 | 546 | { |
b79fafac | 547 | return; |
057cbf49 NB |
548 | } |
549 | ||
131e6abc NB |
550 | static void tcm_vhost_aborted_task(struct se_cmd *se_cmd) |
551 | { | |
552 | return; | |
553 | } | |
554 | ||
a6c9af87 AH |
555 | static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt) |
556 | { | |
557 | vs->vs_events_nr--; | |
558 | kfree(evt); | |
559 | } | |
560 | ||
683bd967 AH |
561 | static struct tcm_vhost_evt * |
562 | tcm_vhost_allocate_evt(struct vhost_scsi *vs, | |
563 | u32 event, u32 reason) | |
a6c9af87 | 564 | { |
3ab2e420 | 565 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
566 | struct tcm_vhost_evt *evt; |
567 | ||
568 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
569 | vs->vs_events_missed = true; | |
570 | return NULL; | |
571 | } | |
572 | ||
573 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
574 | if (!evt) { | |
575 | vq_err(vq, "Failed to allocate tcm_vhost_evt\n"); | |
576 | vs->vs_events_missed = true; | |
577 | return NULL; | |
578 | } | |
579 | ||
580 | evt->event.event = event; | |
581 | evt->event.reason = reason; | |
582 | vs->vs_events_nr++; | |
583 | ||
584 | return evt; | |
585 | } | |
586 | ||
3c63f66a | 587 | static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *cmd) |
057cbf49 | 588 | { |
3c63f66a | 589 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
590 | |
591 | /* TODO locking against target/backend threads? */ | |
6c131d0c | 592 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 593 | |
084ed45b | 594 | } |
f2f0173d | 595 | |
084ed45b NB |
596 | static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) |
597 | { | |
598 | return target_put_sess_cmd(se_cmd->se_sess, se_cmd); | |
057cbf49 NB |
599 | } |
600 | ||
683bd967 AH |
601 | static void |
602 | tcm_vhost_do_evt_work(struct vhost_scsi *vs, struct tcm_vhost_evt *evt) | |
a6c9af87 | 603 | { |
3ab2e420 | 604 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
605 | struct virtio_scsi_event *event = &evt->event; |
606 | struct virtio_scsi_event __user *eventp; | |
607 | unsigned out, in; | |
608 | int head, ret; | |
609 | ||
610 | if (!vq->private_data) { | |
611 | vs->vs_events_missed = true; | |
612 | return; | |
613 | } | |
614 | ||
615 | again: | |
616 | vhost_disable_notify(&vs->dev, vq); | |
47283bef | 617 | head = vhost_get_vq_desc(vq, vq->iov, |
a6c9af87 AH |
618 | ARRAY_SIZE(vq->iov), &out, &in, |
619 | NULL, NULL); | |
620 | if (head < 0) { | |
621 | vs->vs_events_missed = true; | |
622 | return; | |
623 | } | |
624 | if (head == vq->num) { | |
625 | if (vhost_enable_notify(&vs->dev, vq)) | |
626 | goto again; | |
627 | vs->vs_events_missed = true; | |
628 | return; | |
629 | } | |
630 | ||
631 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { | |
632 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", | |
633 | vq->iov[out].iov_len); | |
634 | vs->vs_events_missed = true; | |
635 | return; | |
636 | } | |
637 | ||
638 | if (vs->vs_events_missed) { | |
639 | event->event |= VIRTIO_SCSI_T_EVENTS_MISSED; | |
640 | vs->vs_events_missed = false; | |
641 | } | |
642 | ||
643 | eventp = vq->iov[out].iov_base; | |
644 | ret = __copy_to_user(eventp, event, sizeof(*event)); | |
645 | if (!ret) | |
646 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
647 | else | |
648 | vq_err(vq, "Faulted on tcm_vhost_send_event\n"); | |
649 | } | |
650 | ||
651 | static void tcm_vhost_evt_work(struct vhost_work *work) | |
652 | { | |
653 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
654 | vs_event_work); | |
3ab2e420 | 655 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
656 | struct tcm_vhost_evt *evt; |
657 | struct llist_node *llnode; | |
658 | ||
659 | mutex_lock(&vq->mutex); | |
660 | llnode = llist_del_all(&vs->vs_event_list); | |
661 | while (llnode) { | |
662 | evt = llist_entry(llnode, struct tcm_vhost_evt, list); | |
663 | llnode = llist_next(llnode); | |
664 | tcm_vhost_do_evt_work(vs, evt); | |
665 | tcm_vhost_free_evt(vs, evt); | |
666 | } | |
667 | mutex_unlock(&vq->mutex); | |
668 | } | |
669 | ||
057cbf49 NB |
670 | /* Fill in status and signal that we are done processing this command |
671 | * | |
672 | * This is scheduled in the vhost work queue so we are called with the owner | |
673 | * process mm and can access the vring. | |
674 | */ | |
675 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) | |
676 | { | |
677 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
678 | vs_completion_work); | |
1b7f390e | 679 | DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 680 | struct virtio_scsi_cmd_resp v_rsp; |
3c63f66a | 681 | struct tcm_vhost_cmd *cmd; |
9d6064a3 AH |
682 | struct llist_node *llnode; |
683 | struct se_cmd *se_cmd; | |
1b7f390e | 684 | int ret, vq; |
057cbf49 | 685 | |
1b7f390e | 686 | bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 AH |
687 | llnode = llist_del_all(&vs->vs_completion_list); |
688 | while (llnode) { | |
3c63f66a | 689 | cmd = llist_entry(llnode, struct tcm_vhost_cmd, |
9d6064a3 AH |
690 | tvc_completion_list); |
691 | llnode = llist_next(llnode); | |
3c63f66a | 692 | se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
693 | |
694 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
3c63f66a | 695 | cmd, se_cmd->residual_count, se_cmd->scsi_status); |
057cbf49 NB |
696 | |
697 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
698 | v_rsp.resid = se_cmd->residual_count; | |
699 | /* TODO is status_qualifier field needed? */ | |
700 | v_rsp.status = se_cmd->scsi_status; | |
701 | v_rsp.sense_len = se_cmd->scsi_sense_length; | |
3c63f66a | 702 | memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
057cbf49 | 703 | v_rsp.sense_len); |
3c63f66a | 704 | ret = copy_to_user(cmd->tvc_resp, &v_rsp, sizeof(v_rsp)); |
1b7f390e | 705 | if (likely(ret == 0)) { |
3ab2e420 | 706 | struct vhost_scsi_virtqueue *q; |
3c63f66a AH |
707 | vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
708 | q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); | |
3ab2e420 | 709 | vq = q - vs->vqs; |
1b7f390e AH |
710 | __set_bit(vq, signal); |
711 | } else | |
057cbf49 NB |
712 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
713 | ||
3c63f66a | 714 | vhost_scsi_free_cmd(cmd); |
057cbf49 NB |
715 | } |
716 | ||
1b7f390e AH |
717 | vq = -1; |
718 | while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) | |
719 | < VHOST_SCSI_MAX_VQ) | |
3ab2e420 | 720 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
721 | } |
722 | ||
683bd967 | 723 | static struct tcm_vhost_cmd * |
95e7c434 NB |
724 | vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct tcm_vhost_tpg *tpg, |
725 | unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr, | |
726 | u32 exp_data_len, int data_direction) | |
057cbf49 | 727 | { |
3c63f66a | 728 | struct tcm_vhost_cmd *cmd; |
057cbf49 | 729 | struct tcm_vhost_nexus *tv_nexus; |
4824d3bf | 730 | struct se_session *se_sess; |
b1935f68 | 731 | struct scatterlist *sg, *prot_sg; |
3aee26b4 | 732 | struct page **pages; |
4824d3bf | 733 | int tag; |
057cbf49 | 734 | |
98718312 | 735 | tv_nexus = tpg->tpg_nexus; |
057cbf49 NB |
736 | if (!tv_nexus) { |
737 | pr_err("Unable to locate active struct tcm_vhost_nexus\n"); | |
738 | return ERR_PTR(-EIO); | |
739 | } | |
4824d3bf | 740 | se_sess = tv_nexus->tvn_se_sess; |
057cbf49 | 741 | |
6f6b5d1e | 742 | tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING); |
4a47d3a1 NB |
743 | if (tag < 0) { |
744 | pr_err("Unable to obtain tag for tcm_vhost_cmd\n"); | |
745 | return ERR_PTR(-ENOMEM); | |
746 | } | |
747 | ||
4824d3bf | 748 | cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[tag]; |
3aee26b4 | 749 | sg = cmd->tvc_sgl; |
b1935f68 | 750 | prot_sg = cmd->tvc_prot_sgl; |
3aee26b4 | 751 | pages = cmd->tvc_upages; |
4824d3bf NB |
752 | memset(cmd, 0, sizeof(struct tcm_vhost_cmd)); |
753 | ||
3aee26b4 | 754 | cmd->tvc_sgl = sg; |
b1935f68 | 755 | cmd->tvc_prot_sgl = prot_sg; |
3aee26b4 | 756 | cmd->tvc_upages = pages; |
4824d3bf | 757 | cmd->tvc_se_cmd.map_tag = tag; |
95e7c434 NB |
758 | cmd->tvc_tag = scsi_tag; |
759 | cmd->tvc_lun = lun; | |
760 | cmd->tvc_task_attr = task_attr; | |
3c63f66a AH |
761 | cmd->tvc_exp_data_len = exp_data_len; |
762 | cmd->tvc_data_direction = data_direction; | |
763 | cmd->tvc_nexus = tv_nexus; | |
764 | cmd->inflight = tcm_vhost_get_inflight(vq); | |
765 | ||
95e7c434 NB |
766 | memcpy(cmd->tvc_cdb, cdb, TCM_VHOST_MAX_CDB_SIZE); |
767 | ||
3c63f66a | 768 | return cmd; |
057cbf49 NB |
769 | } |
770 | ||
771 | /* | |
772 | * Map a user memory range into a scatterlist | |
773 | * | |
774 | * Returns the number of scatterlist entries used or -errno on error. | |
775 | */ | |
683bd967 | 776 | static int |
3aee26b4 NB |
777 | vhost_scsi_map_to_sgl(struct tcm_vhost_cmd *tv_cmd, |
778 | struct scatterlist *sgl, | |
683bd967 AH |
779 | unsigned int sgl_count, |
780 | struct iovec *iov, | |
5a01d082 NB |
781 | struct page **pages, |
782 | bool write) | |
057cbf49 | 783 | { |
1810053e | 784 | unsigned int npages = 0, pages_nr, offset, nbytes; |
057cbf49 | 785 | struct scatterlist *sg = sgl; |
1810053e AH |
786 | void __user *ptr = iov->iov_base; |
787 | size_t len = iov->iov_len; | |
1810053e | 788 | int ret, i; |
057cbf49 | 789 | |
1810053e | 790 | pages_nr = iov_num_pages(iov); |
5a01d082 NB |
791 | if (pages_nr > sgl_count) { |
792 | pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than" | |
793 | " sgl_count: %u\n", pages_nr, sgl_count); | |
1810053e | 794 | return -ENOBUFS; |
5a01d082 NB |
795 | } |
796 | if (pages_nr > TCM_VHOST_PREALLOC_UPAGES) { | |
3aee26b4 | 797 | pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than" |
5a01d082 NB |
798 | " preallocated TCM_VHOST_PREALLOC_UPAGES: %u\n", |
799 | pages_nr, TCM_VHOST_PREALLOC_UPAGES); | |
3aee26b4 NB |
800 | return -ENOBUFS; |
801 | } | |
802 | ||
1810053e AH |
803 | ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages); |
804 | /* No pages were pinned */ | |
805 | if (ret < 0) | |
806 | goto out; | |
807 | /* Less pages pinned than wanted */ | |
808 | if (ret != pages_nr) { | |
809 | for (i = 0; i < ret; i++) | |
810 | put_page(pages[i]); | |
811 | ret = -EFAULT; | |
812 | goto out; | |
813 | } | |
814 | ||
815 | while (len > 0) { | |
816 | offset = (uintptr_t)ptr & ~PAGE_MASK; | |
817 | nbytes = min_t(unsigned int, PAGE_SIZE - offset, len); | |
818 | sg_set_page(sg, pages[npages], nbytes, offset); | |
057cbf49 NB |
819 | ptr += nbytes; |
820 | len -= nbytes; | |
821 | sg++; | |
822 | npages++; | |
823 | } | |
057cbf49 | 824 | |
1810053e | 825 | out: |
057cbf49 NB |
826 | return ret; |
827 | } | |
828 | ||
683bd967 | 829 | static int |
3c63f66a | 830 | vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *cmd, |
683bd967 | 831 | struct iovec *iov, |
5a01d082 NB |
832 | int niov, |
833 | bool write) | |
057cbf49 | 834 | { |
5a01d082 NB |
835 | struct scatterlist *sg = cmd->tvc_sgl; |
836 | unsigned int sgl_count = 0; | |
837 | int ret, i; | |
057cbf49 | 838 | |
f3158f36 AH |
839 | for (i = 0; i < niov; i++) |
840 | sgl_count += iov_num_pages(&iov[i]); | |
841 | ||
5a01d082 NB |
842 | if (sgl_count > TCM_VHOST_PREALLOC_SGLS) { |
843 | pr_err("vhost_scsi_map_iov_to_sgl() sgl_count: %u greater than" | |
844 | " preallocated TCM_VHOST_PREALLOC_SGLS: %u\n", | |
845 | sgl_count, TCM_VHOST_PREALLOC_SGLS); | |
846 | return -ENOBUFS; | |
847 | } | |
057cbf49 | 848 | |
3aee26b4 | 849 | pr_debug("%s sg %p sgl_count %u\n", __func__, sg, sgl_count); |
057cbf49 | 850 | sg_init_table(sg, sgl_count); |
3c63f66a | 851 | cmd->tvc_sgl_count = sgl_count; |
057cbf49 | 852 | |
5a01d082 NB |
853 | pr_debug("Mapping iovec %p for %u pages\n", &iov[0], sgl_count); |
854 | ||
057cbf49 | 855 | for (i = 0; i < niov; i++) { |
3aee26b4 | 856 | ret = vhost_scsi_map_to_sgl(cmd, sg, sgl_count, &iov[i], |
5a01d082 | 857 | cmd->tvc_upages, write); |
057cbf49 | 858 | if (ret < 0) { |
3c63f66a AH |
859 | for (i = 0; i < cmd->tvc_sgl_count; i++) |
860 | put_page(sg_page(&cmd->tvc_sgl[i])); | |
3aee26b4 | 861 | |
3c63f66a | 862 | cmd->tvc_sgl_count = 0; |
057cbf49 NB |
863 | return ret; |
864 | } | |
057cbf49 NB |
865 | sg += ret; |
866 | sgl_count -= ret; | |
867 | } | |
868 | return 0; | |
869 | } | |
870 | ||
e31885dd NB |
871 | static int |
872 | vhost_scsi_map_iov_to_prot(struct tcm_vhost_cmd *cmd, | |
873 | struct iovec *iov, | |
874 | int niov, | |
875 | bool write) | |
876 | { | |
877 | struct scatterlist *prot_sg = cmd->tvc_prot_sgl; | |
878 | unsigned int prot_sgl_count = 0; | |
879 | int ret, i; | |
880 | ||
881 | for (i = 0; i < niov; i++) | |
882 | prot_sgl_count += iov_num_pages(&iov[i]); | |
883 | ||
884 | if (prot_sgl_count > TCM_VHOST_PREALLOC_PROT_SGLS) { | |
885 | pr_err("vhost_scsi_map_iov_to_prot() sgl_count: %u greater than" | |
886 | " preallocated TCM_VHOST_PREALLOC_PROT_SGLS: %u\n", | |
887 | prot_sgl_count, TCM_VHOST_PREALLOC_PROT_SGLS); | |
888 | return -ENOBUFS; | |
889 | } | |
890 | ||
891 | pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__, | |
892 | prot_sg, prot_sgl_count); | |
893 | sg_init_table(prot_sg, prot_sgl_count); | |
894 | cmd->tvc_prot_sgl_count = prot_sgl_count; | |
895 | ||
896 | for (i = 0; i < niov; i++) { | |
897 | ret = vhost_scsi_map_to_sgl(cmd, prot_sg, prot_sgl_count, &iov[i], | |
898 | cmd->tvc_upages, write); | |
899 | if (ret < 0) { | |
900 | for (i = 0; i < cmd->tvc_prot_sgl_count; i++) | |
901 | put_page(sg_page(&cmd->tvc_prot_sgl[i])); | |
902 | ||
903 | cmd->tvc_prot_sgl_count = 0; | |
904 | return ret; | |
905 | } | |
906 | prot_sg += ret; | |
907 | prot_sgl_count -= ret; | |
908 | } | |
909 | return 0; | |
910 | } | |
911 | ||
057cbf49 NB |
912 | static void tcm_vhost_submission_work(struct work_struct *work) |
913 | { | |
3c63f66a | 914 | struct tcm_vhost_cmd *cmd = |
057cbf49 | 915 | container_of(work, struct tcm_vhost_cmd, work); |
9f0abc15 | 916 | struct tcm_vhost_nexus *tv_nexus; |
3c63f66a | 917 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
95e7c434 NB |
918 | struct scatterlist *sg_ptr, *sg_prot_ptr = NULL; |
919 | int rc; | |
057cbf49 | 920 | |
95e7c434 | 921 | /* FIXME: BIDI operation */ |
3c63f66a AH |
922 | if (cmd->tvc_sgl_count) { |
923 | sg_ptr = cmd->tvc_sgl; | |
95e7c434 NB |
924 | |
925 | if (cmd->tvc_prot_sgl_count) | |
926 | sg_prot_ptr = cmd->tvc_prot_sgl; | |
927 | else | |
928 | se_cmd->prot_pto = true; | |
057cbf49 NB |
929 | } else { |
930 | sg_ptr = NULL; | |
931 | } | |
3c63f66a | 932 | tv_nexus = cmd->tvc_nexus; |
9f0abc15 NB |
933 | |
934 | rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, | |
3c63f66a AH |
935 | cmd->tvc_cdb, &cmd->tvc_sense_buf[0], |
936 | cmd->tvc_lun, cmd->tvc_exp_data_len, | |
937 | cmd->tvc_task_attr, cmd->tvc_data_direction, | |
6d2fa9e1 | 938 | TARGET_SCF_ACK_KREF, sg_ptr, cmd->tvc_sgl_count, |
95e7c434 | 939 | NULL, 0, sg_prot_ptr, cmd->tvc_prot_sgl_count); |
057cbf49 NB |
940 | if (rc < 0) { |
941 | transport_send_check_condition_and_sense(se_cmd, | |
9f0abc15 | 942 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
057cbf49 | 943 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 944 | } |
057cbf49 NB |
945 | } |
946 | ||
683bd967 AH |
947 | static void |
948 | vhost_scsi_send_bad_target(struct vhost_scsi *vs, | |
949 | struct vhost_virtqueue *vq, | |
950 | int head, unsigned out) | |
637ab21e AH |
951 | { |
952 | struct virtio_scsi_cmd_resp __user *resp; | |
953 | struct virtio_scsi_cmd_resp rsp; | |
954 | int ret; | |
955 | ||
956 | memset(&rsp, 0, sizeof(rsp)); | |
957 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
958 | resp = vq->iov[out].iov_base; | |
959 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
960 | if (!ret) | |
961 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
962 | else | |
963 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
964 | } | |
965 | ||
683bd967 AH |
966 | static void |
967 | vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
057cbf49 | 968 | { |
4f7f46d3 | 969 | struct tcm_vhost_tpg **vs_tpg; |
057cbf49 | 970 | struct virtio_scsi_cmd_req v_req; |
95e7c434 | 971 | struct virtio_scsi_cmd_req_pi v_req_pi; |
98718312 | 972 | struct tcm_vhost_tpg *tpg; |
3c63f66a | 973 | struct tcm_vhost_cmd *cmd; |
95e7c434 NB |
974 | u64 tag; |
975 | u32 exp_data_len, data_first, data_num, data_direction, prot_first; | |
057cbf49 | 976 | unsigned out, in, i; |
95e7c434 NB |
977 | int head, ret, data_niov, prot_niov, prot_bytes; |
978 | size_t req_size; | |
979 | u16 lun; | |
980 | u8 *target, *lunp, task_attr; | |
981 | bool hdr_pi; | |
982 | void *req, *cdb; | |
057cbf49 | 983 | |
e7802212 | 984 | mutex_lock(&vq->mutex); |
4f7f46d3 AH |
985 | /* |
986 | * We can handle the vq only after the endpoint is setup by calling the | |
987 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
4f7f46d3 | 988 | */ |
e7802212 | 989 | vs_tpg = vq->private_data; |
4f7f46d3 | 990 | if (!vs_tpg) |
e7802212 | 991 | goto out; |
057cbf49 | 992 | |
057cbf49 NB |
993 | vhost_disable_notify(&vs->dev, vq); |
994 | ||
995 | for (;;) { | |
47283bef | 996 | head = vhost_get_vq_desc(vq, vq->iov, |
057cbf49 NB |
997 | ARRAY_SIZE(vq->iov), &out, &in, |
998 | NULL, NULL); | |
999 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", | |
1000 | head, out, in); | |
1001 | /* On error, stop handling until the next kick. */ | |
1002 | if (unlikely(head < 0)) | |
1003 | break; | |
1004 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
1005 | if (head == vq->num) { | |
1006 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
1007 | vhost_disable_notify(&vs->dev, vq); | |
1008 | continue; | |
1009 | } | |
1010 | break; | |
1011 | } | |
1012 | ||
95e7c434 | 1013 | /* FIXME: BIDI operation */ |
057cbf49 NB |
1014 | if (out == 1 && in == 1) { |
1015 | data_direction = DMA_NONE; | |
1016 | data_first = 0; | |
1017 | data_num = 0; | |
1018 | } else if (out == 1 && in > 1) { | |
1019 | data_direction = DMA_FROM_DEVICE; | |
1020 | data_first = out + 1; | |
1021 | data_num = in - 1; | |
1022 | } else if (out > 1 && in == 1) { | |
1023 | data_direction = DMA_TO_DEVICE; | |
1024 | data_first = 1; | |
1025 | data_num = out - 1; | |
1026 | } else { | |
1027 | vq_err(vq, "Invalid buffer layout out: %u in: %u\n", | |
1028 | out, in); | |
1029 | break; | |
1030 | } | |
1031 | ||
1032 | /* | |
1033 | * Check for a sane resp buffer so we can report errors to | |
1034 | * the guest. | |
1035 | */ | |
1036 | if (unlikely(vq->iov[out].iov_len != | |
1037 | sizeof(struct virtio_scsi_cmd_resp))) { | |
1038 | vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu" | |
1039 | " bytes\n", vq->iov[out].iov_len); | |
1040 | break; | |
1041 | } | |
1042 | ||
ed9ea4ed | 1043 | if (vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI)) { |
95e7c434 NB |
1044 | req = &v_req_pi; |
1045 | lunp = &v_req_pi.lun[0]; | |
1046 | target = &v_req_pi.lun[1]; | |
1047 | req_size = sizeof(v_req_pi); | |
1048 | hdr_pi = true; | |
1049 | } else { | |
1050 | req = &v_req; | |
1051 | lunp = &v_req.lun[0]; | |
1052 | target = &v_req.lun[1]; | |
1053 | req_size = sizeof(v_req); | |
1054 | hdr_pi = false; | |
1055 | } | |
1056 | ||
1057 | if (unlikely(vq->iov[0].iov_len < req_size)) { | |
1058 | pr_err("Expecting virtio-scsi header: %zu, got %zu\n", | |
1059 | req_size, vq->iov[0].iov_len); | |
057cbf49 NB |
1060 | break; |
1061 | } | |
95e7c434 | 1062 | ret = memcpy_fromiovecend(req, &vq->iov[0], 0, req_size); |
057cbf49 NB |
1063 | if (unlikely(ret)) { |
1064 | vq_err(vq, "Faulted on virtio_scsi_cmd_req\n"); | |
1065 | break; | |
1066 | } | |
1067 | ||
7fe412d0 | 1068 | /* virtio-scsi spec requires byte 0 of the lun to be 1 */ |
95e7c434 | 1069 | if (unlikely(*lunp != 1)) { |
7fe412d0 VS |
1070 | vhost_scsi_send_bad_target(vs, vq, head, out); |
1071 | continue; | |
1072 | } | |
1073 | ||
95e7c434 | 1074 | tpg = ACCESS_ONCE(vs_tpg[*target]); |
67e18cf9 AH |
1075 | |
1076 | /* Target does not exist, fail the request */ | |
98718312 | 1077 | if (unlikely(!tpg)) { |
637ab21e | 1078 | vhost_scsi_send_bad_target(vs, vq, head, out); |
67e18cf9 AH |
1079 | continue; |
1080 | } | |
1081 | ||
95e7c434 NB |
1082 | data_niov = data_num; |
1083 | prot_niov = prot_first = prot_bytes = 0; | |
1084 | /* | |
1085 | * Determine if any protection information iovecs are preceeding | |
1086 | * the actual data payload, and adjust data_first + data_niov | |
1087 | * values accordingly for vhost_scsi_map_iov_to_sgl() below. | |
1088 | * | |
1089 | * Also extract virtio_scsi header bits for vhost_scsi_get_tag() | |
1090 | */ | |
1091 | if (hdr_pi) { | |
1092 | if (v_req_pi.pi_bytesout) { | |
1093 | if (data_direction != DMA_TO_DEVICE) { | |
1094 | vq_err(vq, "Received non zero do_pi_niov" | |
1095 | ", but wrong data_direction\n"); | |
1096 | goto err_cmd; | |
1097 | } | |
1098 | prot_bytes = v_req_pi.pi_bytesout; | |
1099 | } else if (v_req_pi.pi_bytesin) { | |
1100 | if (data_direction != DMA_FROM_DEVICE) { | |
1101 | vq_err(vq, "Received non zero di_pi_niov" | |
1102 | ", but wrong data_direction\n"); | |
1103 | goto err_cmd; | |
1104 | } | |
1105 | prot_bytes = v_req_pi.pi_bytesin; | |
1106 | } | |
1107 | if (prot_bytes) { | |
1108 | int tmp = 0; | |
1109 | ||
1110 | for (i = 0; i < data_num; i++) { | |
1111 | tmp += vq->iov[data_first + i].iov_len; | |
1112 | prot_niov++; | |
1113 | if (tmp >= prot_bytes) | |
1114 | break; | |
1115 | } | |
1116 | prot_first = data_first; | |
1117 | data_first += prot_niov; | |
1118 | data_niov = data_num - prot_niov; | |
1119 | } | |
1120 | tag = v_req_pi.tag; | |
1121 | task_attr = v_req_pi.task_attr; | |
1122 | cdb = &v_req_pi.cdb[0]; | |
1123 | lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF; | |
1124 | } else { | |
1125 | tag = v_req.tag; | |
1126 | task_attr = v_req.task_attr; | |
1127 | cdb = &v_req.cdb[0]; | |
1128 | lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; | |
1129 | } | |
057cbf49 | 1130 | exp_data_len = 0; |
95e7c434 | 1131 | for (i = 0; i < data_niov; i++) |
057cbf49 | 1132 | exp_data_len += vq->iov[data_first + i].iov_len; |
95e7c434 NB |
1133 | /* |
1134 | * Check that the recieved CDB size does not exceeded our | |
1135 | * hardcoded max for vhost-scsi | |
1136 | * | |
1137 | * TODO what if cdb was too small for varlen cdb header? | |
1138 | */ | |
1139 | if (unlikely(scsi_command_size(cdb) > TCM_VHOST_MAX_CDB_SIZE)) { | |
1140 | vq_err(vq, "Received SCSI CDB with command_size: %d that" | |
1141 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
1142 | scsi_command_size(cdb), TCM_VHOST_MAX_CDB_SIZE); | |
1143 | goto err_cmd; | |
1144 | } | |
057cbf49 | 1145 | |
95e7c434 | 1146 | cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr, |
9f977ef7 NB |
1147 | exp_data_len + prot_bytes, |
1148 | data_direction); | |
3c63f66a | 1149 | if (IS_ERR(cmd)) { |
4824d3bf | 1150 | vq_err(vq, "vhost_scsi_get_tag failed %ld\n", |
3c63f66a | 1151 | PTR_ERR(cmd)); |
055f648c | 1152 | goto err_cmd; |
057cbf49 | 1153 | } |
95e7c434 | 1154 | |
057cbf49 | 1155 | pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction" |
3c63f66a | 1156 | ": %d\n", cmd, exp_data_len, data_direction); |
057cbf49 | 1157 | |
3c63f66a AH |
1158 | cmd->tvc_vhost = vs; |
1159 | cmd->tvc_vq = vq; | |
1160 | cmd->tvc_resp = vq->iov[out].iov_base; | |
057cbf49 | 1161 | |
057cbf49 | 1162 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", |
3c63f66a | 1163 | cmd->tvc_cdb[0], cmd->tvc_lun); |
057cbf49 | 1164 | |
95e7c434 NB |
1165 | if (prot_niov) { |
1166 | ret = vhost_scsi_map_iov_to_prot(cmd, | |
1167 | &vq->iov[prot_first], prot_niov, | |
1168 | data_direction == DMA_FROM_DEVICE); | |
1169 | if (unlikely(ret)) { | |
1170 | vq_err(vq, "Failed to map iov to" | |
1171 | " prot_sgl\n"); | |
1172 | goto err_free; | |
1173 | } | |
1174 | } | |
057cbf49 | 1175 | if (data_direction != DMA_NONE) { |
3c63f66a | 1176 | ret = vhost_scsi_map_iov_to_sgl(cmd, |
95e7c434 | 1177 | &vq->iov[data_first], data_niov, |
60a01f55 | 1178 | data_direction == DMA_FROM_DEVICE); |
057cbf49 NB |
1179 | if (unlikely(ret)) { |
1180 | vq_err(vq, "Failed to map iov to sgl\n"); | |
055f648c | 1181 | goto err_free; |
057cbf49 NB |
1182 | } |
1183 | } | |
057cbf49 NB |
1184 | /* |
1185 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
1186 | * complete the virtio-scsi request in TCM callback context via | |
1187 | * tcm_vhost_queue_data_in() and tcm_vhost_queue_status() | |
1188 | */ | |
3c63f66a | 1189 | cmd->tvc_vq_desc = head; |
057cbf49 NB |
1190 | /* |
1191 | * Dispatch tv_cmd descriptor for cmwq execution in process | |
1192 | * context provided by tcm_vhost_workqueue. This also ensures | |
1193 | * tv_cmd is executed on the same kworker CPU as this vhost | |
1194 | * thread to gain positive L2 cache locality effects.. | |
1195 | */ | |
3c63f66a AH |
1196 | INIT_WORK(&cmd->work, tcm_vhost_submission_work); |
1197 | queue_work(tcm_vhost_workqueue, &cmd->work); | |
057cbf49 NB |
1198 | } |
1199 | ||
1200 | mutex_unlock(&vq->mutex); | |
7ea206cf AH |
1201 | return; |
1202 | ||
055f648c | 1203 | err_free: |
3c63f66a | 1204 | vhost_scsi_free_cmd(cmd); |
055f648c AH |
1205 | err_cmd: |
1206 | vhost_scsi_send_bad_target(vs, vq, head, out); | |
e7802212 | 1207 | out: |
7ea206cf | 1208 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
1209 | } |
1210 | ||
1211 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) | |
1212 | { | |
101998f6 | 1213 | pr_debug("%s: The handling func for control queue.\n", __func__); |
057cbf49 NB |
1214 | } |
1215 | ||
683bd967 AH |
1216 | static void |
1217 | tcm_vhost_send_evt(struct vhost_scsi *vs, | |
1218 | struct tcm_vhost_tpg *tpg, | |
1219 | struct se_lun *lun, | |
1220 | u32 event, | |
1221 | u32 reason) | |
a6c9af87 AH |
1222 | { |
1223 | struct tcm_vhost_evt *evt; | |
1224 | ||
1225 | evt = tcm_vhost_allocate_evt(vs, event, reason); | |
1226 | if (!evt) | |
1227 | return; | |
1228 | ||
1229 | if (tpg && lun) { | |
1230 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
1231 | /* | |
1232 | * Note: evt->event is zeroed when we allocate it and | |
1233 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
1234 | */ | |
1235 | evt->event.lun[0] = 0x01; | |
1236 | evt->event.lun[1] = tpg->tport_tpgt & 0xFF; | |
1237 | if (lun->unpacked_lun >= 256) | |
1238 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
1239 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
1240 | } | |
1241 | ||
1242 | llist_add(&evt->list, &vs->vs_event_list); | |
1243 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
1244 | } | |
1245 | ||
057cbf49 NB |
1246 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
1247 | { | |
a6c9af87 AH |
1248 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1249 | poll.work); | |
1250 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1251 | ||
1252 | mutex_lock(&vq->mutex); | |
1253 | if (!vq->private_data) | |
1254 | goto out; | |
1255 | ||
1256 | if (vs->vs_events_missed) | |
1257 | tcm_vhost_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); | |
1258 | out: | |
1259 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
1260 | } |
1261 | ||
1262 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
1263 | { | |
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 | ||
1b7f390e | 1268 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
1269 | } |
1270 | ||
4f7f46d3 AH |
1271 | static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
1272 | { | |
3ab2e420 | 1273 | vhost_poll_flush(&vs->vqs[index].vq.poll); |
4f7f46d3 AH |
1274 | } |
1275 | ||
3dfbff32 | 1276 | /* Callers must hold dev mutex */ |
4f7f46d3 AH |
1277 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
1278 | { | |
f2f0173d | 1279 | struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; |
4f7f46d3 AH |
1280 | int i; |
1281 | ||
f2f0173d AH |
1282 | /* Init new inflight and remember the old inflight */ |
1283 | tcm_vhost_init_inflight(vs, old_inflight); | |
1284 | ||
1285 | /* | |
1286 | * The inflight->kref was initialized to 1. We decrement it here to | |
1287 | * indicate the start of the flush operation so that it will reach 0 | |
1288 | * when all the reqs are finished. | |
1289 | */ | |
1290 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1291 | kref_put(&old_inflight[i]->kref, tcm_vhost_done_inflight); | |
1292 | ||
1293 | /* Flush both the vhost poll and vhost work */ | |
4f7f46d3 AH |
1294 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
1295 | vhost_scsi_flush_vq(vs, i); | |
1296 | vhost_work_flush(&vs->dev, &vs->vs_completion_work); | |
a6c9af87 | 1297 | vhost_work_flush(&vs->dev, &vs->vs_event_work); |
f2f0173d AH |
1298 | |
1299 | /* Wait for all reqs issued before the flush to be finished */ | |
1300 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1301 | wait_for_completion(&old_inflight[i]->comp); | |
4f7f46d3 AH |
1302 | } |
1303 | ||
057cbf49 NB |
1304 | /* |
1305 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
1306 | * tcm_vhost_tpg with an active struct tcm_vhost_nexus | |
f2b7daf5 AH |
1307 | * |
1308 | * The lock nesting rule is: | |
1309 | * tcm_vhost_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex | |
057cbf49 | 1310 | */ |
683bd967 AH |
1311 | static int |
1312 | vhost_scsi_set_endpoint(struct vhost_scsi *vs, | |
1313 | struct vhost_scsi_target *t) | |
057cbf49 NB |
1314 | { |
1315 | struct tcm_vhost_tport *tv_tport; | |
98718312 | 1316 | struct tcm_vhost_tpg *tpg; |
4f7f46d3 AH |
1317 | struct tcm_vhost_tpg **vs_tpg; |
1318 | struct vhost_virtqueue *vq; | |
1319 | int index, ret, i, len; | |
67e18cf9 | 1320 | bool match = false; |
057cbf49 | 1321 | |
f2b7daf5 | 1322 | mutex_lock(&tcm_vhost_mutex); |
057cbf49 | 1323 | mutex_lock(&vs->dev.mutex); |
f2b7daf5 | 1324 | |
057cbf49 NB |
1325 | /* Verify that ring has been setup correctly. */ |
1326 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
1327 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 1328 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
1329 | ret = -EFAULT; |
1330 | goto out; | |
057cbf49 NB |
1331 | } |
1332 | } | |
057cbf49 | 1333 | |
4f7f46d3 AH |
1334 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
1335 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
1336 | if (!vs_tpg) { | |
f2b7daf5 AH |
1337 | ret = -ENOMEM; |
1338 | goto out; | |
4f7f46d3 AH |
1339 | } |
1340 | if (vs->vs_tpg) | |
1341 | memcpy(vs_tpg, vs->vs_tpg, len); | |
1342 | ||
98718312 AH |
1343 | list_for_each_entry(tpg, &tcm_vhost_list, tv_tpg_list) { |
1344 | mutex_lock(&tpg->tv_tpg_mutex); | |
1345 | if (!tpg->tpg_nexus) { | |
1346 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1347 | continue; |
1348 | } | |
98718312 AH |
1349 | if (tpg->tv_tpg_vhost_count != 0) { |
1350 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1351 | continue; |
1352 | } | |
98718312 | 1353 | tv_tport = tpg->tport; |
057cbf49 | 1354 | |
67e18cf9 | 1355 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
98718312 | 1356 | if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
4f7f46d3 | 1357 | kfree(vs_tpg); |
98718312 | 1358 | mutex_unlock(&tpg->tv_tpg_mutex); |
f2b7daf5 AH |
1359 | ret = -EEXIST; |
1360 | goto out; | |
101998f6 | 1361 | } |
98718312 AH |
1362 | tpg->tv_tpg_vhost_count++; |
1363 | tpg->vhost_scsi = vs; | |
1364 | vs_tpg[tpg->tport_tpgt] = tpg; | |
4e857c58 | 1365 | smp_mb__after_atomic(); |
67e18cf9 | 1366 | match = true; |
057cbf49 | 1367 | } |
98718312 | 1368 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1369 | } |
67e18cf9 AH |
1370 | |
1371 | if (match) { | |
1372 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1373 | sizeof(vs->vs_vhost_wwpn)); | |
4f7f46d3 | 1374 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
3ab2e420 | 1375 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1376 | mutex_lock(&vq->mutex); |
22fa90c7 | 1377 | vq->private_data = vs_tpg; |
dfd5d569 | 1378 | vhost_init_used(vq); |
4f7f46d3 AH |
1379 | mutex_unlock(&vq->mutex); |
1380 | } | |
67e18cf9 AH |
1381 | ret = 0; |
1382 | } else { | |
1383 | ret = -EEXIST; | |
1384 | } | |
1385 | ||
4f7f46d3 AH |
1386 | /* |
1387 | * Act as synchronize_rcu to make sure access to | |
1388 | * old vs->vs_tpg is finished. | |
1389 | */ | |
1390 | vhost_scsi_flush(vs); | |
1391 | kfree(vs->vs_tpg); | |
1392 | vs->vs_tpg = vs_tpg; | |
1393 | ||
f2b7daf5 | 1394 | out: |
67e18cf9 | 1395 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1396 | mutex_unlock(&tcm_vhost_mutex); |
67e18cf9 | 1397 | return ret; |
057cbf49 NB |
1398 | } |
1399 | ||
683bd967 AH |
1400 | static int |
1401 | vhost_scsi_clear_endpoint(struct vhost_scsi *vs, | |
1402 | struct vhost_scsi_target *t) | |
057cbf49 NB |
1403 | { |
1404 | struct tcm_vhost_tport *tv_tport; | |
98718312 | 1405 | struct tcm_vhost_tpg *tpg; |
4f7f46d3 AH |
1406 | struct vhost_virtqueue *vq; |
1407 | bool match = false; | |
67e18cf9 AH |
1408 | int index, ret, i; |
1409 | u8 target; | |
057cbf49 | 1410 | |
f2b7daf5 | 1411 | mutex_lock(&tcm_vhost_mutex); |
057cbf49 NB |
1412 | mutex_lock(&vs->dev.mutex); |
1413 | /* Verify that ring has been setup correctly. */ | |
1414 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1415 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1416 | ret = -EFAULT; |
038e0af4 | 1417 | goto err_dev; |
057cbf49 NB |
1418 | } |
1419 | } | |
4f7f46d3 AH |
1420 | |
1421 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1422 | ret = 0; |
1423 | goto err_dev; | |
4f7f46d3 AH |
1424 | } |
1425 | ||
67e18cf9 AH |
1426 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1427 | target = i; | |
98718312 AH |
1428 | tpg = vs->vs_tpg[target]; |
1429 | if (!tpg) | |
67e18cf9 AH |
1430 | continue; |
1431 | ||
98718312 AH |
1432 | mutex_lock(&tpg->tv_tpg_mutex); |
1433 | tv_tport = tpg->tport; | |
67e18cf9 AH |
1434 | if (!tv_tport) { |
1435 | ret = -ENODEV; | |
038e0af4 | 1436 | goto err_tpg; |
67e18cf9 AH |
1437 | } |
1438 | ||
1439 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
98718312 | 1440 | pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" |
67e18cf9 | 1441 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", |
98718312 | 1442 | tv_tport->tport_name, tpg->tport_tpgt, |
67e18cf9 AH |
1443 | t->vhost_wwpn, t->vhost_tpgt); |
1444 | ret = -EINVAL; | |
038e0af4 | 1445 | goto err_tpg; |
67e18cf9 | 1446 | } |
98718312 AH |
1447 | tpg->tv_tpg_vhost_count--; |
1448 | tpg->vhost_scsi = NULL; | |
67e18cf9 | 1449 | vs->vs_tpg[target] = NULL; |
4f7f46d3 | 1450 | match = true; |
98718312 | 1451 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1452 | } |
4f7f46d3 AH |
1453 | if (match) { |
1454 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
3ab2e420 | 1455 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1456 | mutex_lock(&vq->mutex); |
22fa90c7 | 1457 | vq->private_data = NULL; |
4f7f46d3 AH |
1458 | mutex_unlock(&vq->mutex); |
1459 | } | |
1460 | } | |
1461 | /* | |
1462 | * Act as synchronize_rcu to make sure access to | |
1463 | * old vs->vs_tpg is finished. | |
1464 | */ | |
1465 | vhost_scsi_flush(vs); | |
1466 | kfree(vs->vs_tpg); | |
1467 | vs->vs_tpg = NULL; | |
a6c9af87 | 1468 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1469 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1470 | mutex_unlock(&tcm_vhost_mutex); |
057cbf49 | 1471 | return 0; |
101998f6 | 1472 | |
038e0af4 | 1473 | err_tpg: |
98718312 | 1474 | mutex_unlock(&tpg->tv_tpg_mutex); |
038e0af4 | 1475 | err_dev: |
101998f6 | 1476 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1477 | mutex_unlock(&tcm_vhost_mutex); |
101998f6 | 1478 | return ret; |
057cbf49 NB |
1479 | } |
1480 | ||
4f7f46d3 AH |
1481 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1482 | { | |
ea16c514 MT |
1483 | struct vhost_virtqueue *vq; |
1484 | int i; | |
1485 | ||
4f7f46d3 AH |
1486 | if (features & ~VHOST_SCSI_FEATURES) |
1487 | return -EOPNOTSUPP; | |
1488 | ||
1489 | mutex_lock(&vs->dev.mutex); | |
1490 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1491 | !vhost_log_access_ok(&vs->dev)) { | |
1492 | mutex_unlock(&vs->dev.mutex); | |
1493 | return -EFAULT; | |
1494 | } | |
ea16c514 MT |
1495 | |
1496 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
1497 | vq = &vs->vqs[i].vq; | |
1498 | mutex_lock(&vq->mutex); | |
1499 | vq->acked_features = features; | |
1500 | mutex_unlock(&vq->mutex); | |
1501 | } | |
4f7f46d3 AH |
1502 | mutex_unlock(&vs->dev.mutex); |
1503 | return 0; | |
1504 | } | |
1505 | ||
057cbf49 NB |
1506 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1507 | { | |
c7289312 | 1508 | struct vhost_scsi *vs; |
3ab2e420 | 1509 | struct vhost_virtqueue **vqs; |
595cb754 | 1510 | int r = -ENOMEM, i; |
057cbf49 | 1511 | |
595cb754 MT |
1512 | vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
1513 | if (!vs) { | |
1514 | vs = vzalloc(sizeof(*vs)); | |
1515 | if (!vs) | |
1516 | goto err_vs; | |
1517 | } | |
057cbf49 | 1518 | |
3ab2e420 | 1519 | vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL); |
595cb754 MT |
1520 | if (!vqs) |
1521 | goto err_vqs; | |
3ab2e420 | 1522 | |
c7289312 AH |
1523 | vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); |
1524 | vhost_work_init(&vs->vs_event_work, tcm_vhost_evt_work); | |
a6c9af87 | 1525 | |
c7289312 AH |
1526 | vs->vs_events_nr = 0; |
1527 | vs->vs_events_missed = false; | |
057cbf49 | 1528 | |
c7289312 AH |
1529 | vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; |
1530 | vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1531 | vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1532 | vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
3ab2e420 | 1533 | for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { |
c7289312 AH |
1534 | vqs[i] = &vs->vqs[i].vq; |
1535 | vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
3ab2e420 | 1536 | } |
59566b6e | 1537 | vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ); |
f2f0173d | 1538 | |
c7289312 | 1539 | tcm_vhost_init_inflight(vs, NULL); |
f2f0173d | 1540 | |
c7289312 | 1541 | f->private_data = vs; |
057cbf49 | 1542 | return 0; |
595cb754 | 1543 | |
595cb754 | 1544 | err_vqs: |
68404441 | 1545 | kvfree(vs); |
595cb754 MT |
1546 | err_vs: |
1547 | return r; | |
057cbf49 NB |
1548 | } |
1549 | ||
1550 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1551 | { | |
c7289312 | 1552 | struct vhost_scsi *vs = f->private_data; |
67e18cf9 | 1553 | struct vhost_scsi_target t; |
057cbf49 | 1554 | |
c7289312 AH |
1555 | mutex_lock(&vs->dev.mutex); |
1556 | memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1557 | mutex_unlock(&vs->dev.mutex); | |
1558 | vhost_scsi_clear_endpoint(vs, &t); | |
1559 | vhost_dev_stop(&vs->dev); | |
1560 | vhost_dev_cleanup(&vs->dev, false); | |
a6c9af87 | 1561 | /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
c7289312 AH |
1562 | vhost_scsi_flush(vs); |
1563 | kfree(vs->dev.vqs); | |
68404441 | 1564 | kvfree(vs); |
057cbf49 NB |
1565 | return 0; |
1566 | } | |
1567 | ||
683bd967 AH |
1568 | static long |
1569 | vhost_scsi_ioctl(struct file *f, | |
1570 | unsigned int ioctl, | |
1571 | unsigned long arg) | |
057cbf49 NB |
1572 | { |
1573 | struct vhost_scsi *vs = f->private_data; | |
1574 | struct vhost_scsi_target backend; | |
1575 | void __user *argp = (void __user *)arg; | |
1576 | u64 __user *featurep = argp; | |
11c63418 AH |
1577 | u32 __user *eventsp = argp; |
1578 | u32 events_missed; | |
057cbf49 | 1579 | u64 features; |
101998f6 | 1580 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1581 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1582 | |
1583 | switch (ioctl) { | |
1584 | case VHOST_SCSI_SET_ENDPOINT: | |
1585 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1586 | return -EFAULT; | |
6de7145c MT |
1587 | if (backend.reserved != 0) |
1588 | return -EOPNOTSUPP; | |
057cbf49 NB |
1589 | |
1590 | return vhost_scsi_set_endpoint(vs, &backend); | |
1591 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1592 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1593 | return -EFAULT; | |
6de7145c MT |
1594 | if (backend.reserved != 0) |
1595 | return -EOPNOTSUPP; | |
057cbf49 NB |
1596 | |
1597 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1598 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1599 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1600 | return -EFAULT; |
1601 | return 0; | |
11c63418 AH |
1602 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1603 | if (get_user(events_missed, eventsp)) | |
1604 | return -EFAULT; | |
1605 | mutex_lock(&vq->mutex); | |
1606 | vs->vs_events_missed = events_missed; | |
1607 | mutex_unlock(&vq->mutex); | |
1608 | return 0; | |
1609 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1610 | mutex_lock(&vq->mutex); | |
1611 | events_missed = vs->vs_events_missed; | |
1612 | mutex_unlock(&vq->mutex); | |
1613 | if (put_user(events_missed, eventsp)) | |
1614 | return -EFAULT; | |
1615 | return 0; | |
057cbf49 | 1616 | case VHOST_GET_FEATURES: |
5dade710 | 1617 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1618 | if (copy_to_user(featurep, &features, sizeof features)) |
1619 | return -EFAULT; | |
1620 | return 0; | |
1621 | case VHOST_SET_FEATURES: | |
1622 | if (copy_from_user(&features, featurep, sizeof features)) | |
1623 | return -EFAULT; | |
1624 | return vhost_scsi_set_features(vs, features); | |
1625 | default: | |
1626 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1627 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1628 | /* TODO: flush backend after dev ioctl. */ | |
1629 | if (r == -ENOIOCTLCMD) | |
1630 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1631 | mutex_unlock(&vs->dev.mutex); |
1632 | return r; | |
1633 | } | |
1634 | } | |
1635 | ||
101998f6 NB |
1636 | #ifdef CONFIG_COMPAT |
1637 | static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, | |
1638 | unsigned long arg) | |
1639 | { | |
1640 | return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1641 | } | |
1642 | #endif | |
1643 | ||
057cbf49 NB |
1644 | static const struct file_operations vhost_scsi_fops = { |
1645 | .owner = THIS_MODULE, | |
1646 | .release = vhost_scsi_release, | |
1647 | .unlocked_ioctl = vhost_scsi_ioctl, | |
101998f6 NB |
1648 | #ifdef CONFIG_COMPAT |
1649 | .compat_ioctl = vhost_scsi_compat_ioctl, | |
1650 | #endif | |
057cbf49 NB |
1651 | .open = vhost_scsi_open, |
1652 | .llseek = noop_llseek, | |
1653 | }; | |
1654 | ||
1655 | static struct miscdevice vhost_scsi_misc = { | |
1656 | MISC_DYNAMIC_MINOR, | |
1657 | "vhost-scsi", | |
1658 | &vhost_scsi_fops, | |
1659 | }; | |
1660 | ||
1661 | static int __init vhost_scsi_register(void) | |
1662 | { | |
1663 | return misc_register(&vhost_scsi_misc); | |
1664 | } | |
1665 | ||
1666 | static int vhost_scsi_deregister(void) | |
1667 | { | |
1668 | return misc_deregister(&vhost_scsi_misc); | |
1669 | } | |
1670 | ||
1671 | static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport) | |
1672 | { | |
1673 | switch (tport->tport_proto_id) { | |
1674 | case SCSI_PROTOCOL_SAS: | |
1675 | return "SAS"; | |
1676 | case SCSI_PROTOCOL_FCP: | |
1677 | return "FCP"; | |
1678 | case SCSI_PROTOCOL_ISCSI: | |
1679 | return "iSCSI"; | |
1680 | default: | |
1681 | break; | |
1682 | } | |
1683 | ||
1684 | return "Unknown"; | |
1685 | } | |
1686 | ||
683bd967 AH |
1687 | static void |
1688 | tcm_vhost_do_plug(struct tcm_vhost_tpg *tpg, | |
1689 | struct se_lun *lun, bool plug) | |
a6c9af87 AH |
1690 | { |
1691 | ||
1692 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1693 | struct vhost_virtqueue *vq; | |
1694 | u32 reason; | |
1695 | ||
1696 | if (!vs) | |
1697 | return; | |
1698 | ||
1699 | mutex_lock(&vs->dev.mutex); | |
a6c9af87 AH |
1700 | |
1701 | if (plug) | |
1702 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1703 | else | |
1704 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1705 | ||
3ab2e420 | 1706 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 | 1707 | mutex_lock(&vq->mutex); |
ea16c514 MT |
1708 | if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG)) |
1709 | tcm_vhost_send_evt(vs, tpg, lun, | |
1710 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); | |
a6c9af87 AH |
1711 | mutex_unlock(&vq->mutex); |
1712 | mutex_unlock(&vs->dev.mutex); | |
1713 | } | |
1714 | ||
1715 | static void tcm_vhost_hotplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun) | |
1716 | { | |
1717 | tcm_vhost_do_plug(tpg, lun, true); | |
1718 | } | |
1719 | ||
1720 | static void tcm_vhost_hotunplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun) | |
1721 | { | |
1722 | tcm_vhost_do_plug(tpg, lun, false); | |
1723 | } | |
1724 | ||
101998f6 | 1725 | static int tcm_vhost_port_link(struct se_portal_group *se_tpg, |
683bd967 | 1726 | struct se_lun *lun) |
057cbf49 | 1727 | { |
98718312 | 1728 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, |
057cbf49 NB |
1729 | struct tcm_vhost_tpg, se_tpg); |
1730 | ||
a6c9af87 AH |
1731 | mutex_lock(&tcm_vhost_mutex); |
1732 | ||
98718312 AH |
1733 | mutex_lock(&tpg->tv_tpg_mutex); |
1734 | tpg->tv_tpg_port_count++; | |
1735 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 | 1736 | |
98718312 | 1737 | tcm_vhost_hotplug(tpg, lun); |
a6c9af87 AH |
1738 | |
1739 | mutex_unlock(&tcm_vhost_mutex); | |
1740 | ||
057cbf49 NB |
1741 | return 0; |
1742 | } | |
1743 | ||
101998f6 | 1744 | static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg, |
683bd967 | 1745 | struct se_lun *lun) |
057cbf49 | 1746 | { |
98718312 | 1747 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, |
057cbf49 NB |
1748 | struct tcm_vhost_tpg, se_tpg); |
1749 | ||
a6c9af87 AH |
1750 | mutex_lock(&tcm_vhost_mutex); |
1751 | ||
98718312 AH |
1752 | mutex_lock(&tpg->tv_tpg_mutex); |
1753 | tpg->tv_tpg_port_count--; | |
1754 | mutex_unlock(&tpg->tv_tpg_mutex); | |
a6c9af87 | 1755 | |
98718312 | 1756 | tcm_vhost_hotunplug(tpg, lun); |
a6c9af87 AH |
1757 | |
1758 | mutex_unlock(&tcm_vhost_mutex); | |
057cbf49 NB |
1759 | } |
1760 | ||
683bd967 AH |
1761 | static struct se_node_acl * |
1762 | tcm_vhost_make_nodeacl(struct se_portal_group *se_tpg, | |
1763 | struct config_group *group, | |
1764 | const char *name) | |
057cbf49 NB |
1765 | { |
1766 | struct se_node_acl *se_nacl, *se_nacl_new; | |
1767 | struct tcm_vhost_nacl *nacl; | |
1768 | u64 wwpn = 0; | |
1769 | u32 nexus_depth; | |
1770 | ||
1771 | /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0) | |
1772 | return ERR_PTR(-EINVAL); */ | |
1773 | se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg); | |
1774 | if (!se_nacl_new) | |
1775 | return ERR_PTR(-ENOMEM); | |
1776 | ||
1777 | nexus_depth = 1; | |
1778 | /* | |
1779 | * se_nacl_new may be released by core_tpg_add_initiator_node_acl() | |
1780 | * when converting a NodeACL from demo mode -> explict | |
1781 | */ | |
1782 | se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new, | |
1783 | name, nexus_depth); | |
1784 | if (IS_ERR(se_nacl)) { | |
1785 | tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new); | |
1786 | return se_nacl; | |
1787 | } | |
1788 | /* | |
1789 | * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN | |
1790 | */ | |
1791 | nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl); | |
1792 | nacl->iport_wwpn = wwpn; | |
1793 | ||
1794 | return se_nacl; | |
1795 | } | |
1796 | ||
1797 | static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl) | |
1798 | { | |
1799 | struct tcm_vhost_nacl *nacl = container_of(se_acl, | |
1800 | struct tcm_vhost_nacl, se_node_acl); | |
1801 | core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1); | |
1802 | kfree(nacl); | |
1803 | } | |
1804 | ||
3aee26b4 NB |
1805 | static void tcm_vhost_free_cmd_map_res(struct tcm_vhost_nexus *nexus, |
1806 | struct se_session *se_sess) | |
1807 | { | |
1808 | struct tcm_vhost_cmd *tv_cmd; | |
1809 | unsigned int i; | |
1810 | ||
1811 | if (!se_sess->sess_cmd_map) | |
1812 | return; | |
1813 | ||
1814 | for (i = 0; i < TCM_VHOST_DEFAULT_TAGS; i++) { | |
1815 | tv_cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[i]; | |
1816 | ||
1817 | kfree(tv_cmd->tvc_sgl); | |
b1935f68 | 1818 | kfree(tv_cmd->tvc_prot_sgl); |
3aee26b4 NB |
1819 | kfree(tv_cmd->tvc_upages); |
1820 | } | |
1821 | } | |
1822 | ||
98718312 | 1823 | static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tpg, |
683bd967 | 1824 | const char *name) |
057cbf49 NB |
1825 | { |
1826 | struct se_portal_group *se_tpg; | |
3aee26b4 | 1827 | struct se_session *se_sess; |
057cbf49 | 1828 | struct tcm_vhost_nexus *tv_nexus; |
3aee26b4 NB |
1829 | struct tcm_vhost_cmd *tv_cmd; |
1830 | unsigned int i; | |
057cbf49 | 1831 | |
98718312 AH |
1832 | mutex_lock(&tpg->tv_tpg_mutex); |
1833 | if (tpg->tpg_nexus) { | |
1834 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1835 | pr_debug("tpg->tpg_nexus already exists\n"); | |
057cbf49 NB |
1836 | return -EEXIST; |
1837 | } | |
98718312 | 1838 | se_tpg = &tpg->se_tpg; |
057cbf49 NB |
1839 | |
1840 | tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL); | |
1841 | if (!tv_nexus) { | |
98718312 | 1842 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1843 | pr_err("Unable to allocate struct tcm_vhost_nexus\n"); |
1844 | return -ENOMEM; | |
1845 | } | |
1846 | /* | |
4824d3bf NB |
1847 | * Initialize the struct se_session pointer and setup tagpool |
1848 | * for struct tcm_vhost_cmd descriptors | |
057cbf49 | 1849 | */ |
4824d3bf NB |
1850 | tv_nexus->tvn_se_sess = transport_init_session_tags( |
1851 | TCM_VHOST_DEFAULT_TAGS, | |
e70beee7 | 1852 | sizeof(struct tcm_vhost_cmd), |
95e7c434 | 1853 | TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS); |
057cbf49 | 1854 | if (IS_ERR(tv_nexus->tvn_se_sess)) { |
98718312 | 1855 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1856 | kfree(tv_nexus); |
1857 | return -ENOMEM; | |
1858 | } | |
3aee26b4 NB |
1859 | se_sess = tv_nexus->tvn_se_sess; |
1860 | for (i = 0; i < TCM_VHOST_DEFAULT_TAGS; i++) { | |
1861 | tv_cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[i]; | |
1862 | ||
1863 | tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) * | |
1864 | TCM_VHOST_PREALLOC_SGLS, GFP_KERNEL); | |
1865 | if (!tv_cmd->tvc_sgl) { | |
1866 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1867 | pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); | |
1868 | goto out; | |
1869 | } | |
1870 | ||
1871 | tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) * | |
5a01d082 | 1872 | TCM_VHOST_PREALLOC_UPAGES, GFP_KERNEL); |
3aee26b4 NB |
1873 | if (!tv_cmd->tvc_upages) { |
1874 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1875 | pr_err("Unable to allocate tv_cmd->tvc_upages\n"); | |
1876 | goto out; | |
1877 | } | |
b1935f68 NB |
1878 | |
1879 | tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) * | |
1880 | TCM_VHOST_PREALLOC_PROT_SGLS, GFP_KERNEL); | |
1881 | if (!tv_cmd->tvc_prot_sgl) { | |
1882 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1883 | pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); | |
1884 | goto out; | |
1885 | } | |
3aee26b4 | 1886 | } |
057cbf49 NB |
1887 | /* |
1888 | * Since we are running in 'demo mode' this call with generate a | |
1889 | * struct se_node_acl for the tcm_vhost struct se_portal_group with | |
1890 | * the SCSI Initiator port name of the passed configfs group 'name'. | |
1891 | */ | |
1892 | tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
1893 | se_tpg, (unsigned char *)name); | |
1894 | if (!tv_nexus->tvn_se_sess->se_node_acl) { | |
98718312 | 1895 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1896 | pr_debug("core_tpg_check_initiator_node_acl() failed" |
1897 | " for %s\n", name); | |
3aee26b4 | 1898 | goto out; |
057cbf49 NB |
1899 | } |
1900 | /* | |
101998f6 | 1901 | * Now register the TCM vhost virtual I_T Nexus as active with the |
057cbf49 NB |
1902 | * call to __transport_register_session() |
1903 | */ | |
1904 | __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl, | |
1905 | tv_nexus->tvn_se_sess, tv_nexus); | |
98718312 | 1906 | tpg->tpg_nexus = tv_nexus; |
057cbf49 | 1907 | |
98718312 | 1908 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1909 | return 0; |
3aee26b4 NB |
1910 | |
1911 | out: | |
1912 | tcm_vhost_free_cmd_map_res(tv_nexus, se_sess); | |
1913 | transport_free_session(se_sess); | |
1914 | kfree(tv_nexus); | |
1915 | return -ENOMEM; | |
057cbf49 NB |
1916 | } |
1917 | ||
101998f6 | 1918 | static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg *tpg) |
057cbf49 NB |
1919 | { |
1920 | struct se_session *se_sess; | |
1921 | struct tcm_vhost_nexus *tv_nexus; | |
1922 | ||
1923 | mutex_lock(&tpg->tv_tpg_mutex); | |
1924 | tv_nexus = tpg->tpg_nexus; | |
1925 | if (!tv_nexus) { | |
1926 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1927 | return -ENODEV; | |
1928 | } | |
1929 | ||
1930 | se_sess = tv_nexus->tvn_se_sess; | |
1931 | if (!se_sess) { | |
1932 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1933 | return -ENODEV; | |
1934 | } | |
1935 | ||
101998f6 | 1936 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 1937 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1938 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1939 | " active TPG port count: %d\n", |
101998f6 NB |
1940 | tpg->tv_tpg_port_count); |
1941 | return -EBUSY; | |
057cbf49 NB |
1942 | } |
1943 | ||
101998f6 | 1944 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 1945 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1946 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1947 | " active TPG vhost count: %d\n", |
101998f6 NB |
1948 | tpg->tv_tpg_vhost_count); |
1949 | return -EBUSY; | |
057cbf49 NB |
1950 | } |
1951 | ||
101998f6 | 1952 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
057cbf49 NB |
1953 | " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport), |
1954 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
3aee26b4 NB |
1955 | |
1956 | tcm_vhost_free_cmd_map_res(tv_nexus, se_sess); | |
057cbf49 | 1957 | /* |
101998f6 | 1958 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 NB |
1959 | */ |
1960 | transport_deregister_session(tv_nexus->tvn_se_sess); | |
1961 | tpg->tpg_nexus = NULL; | |
1962 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1963 | ||
1964 | kfree(tv_nexus); | |
1965 | return 0; | |
1966 | } | |
1967 | ||
101998f6 | 1968 | static ssize_t tcm_vhost_tpg_show_nexus(struct se_portal_group *se_tpg, |
683bd967 | 1969 | char *page) |
057cbf49 | 1970 | { |
98718312 | 1971 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, |
057cbf49 NB |
1972 | struct tcm_vhost_tpg, se_tpg); |
1973 | struct tcm_vhost_nexus *tv_nexus; | |
1974 | ssize_t ret; | |
1975 | ||
98718312 AH |
1976 | mutex_lock(&tpg->tv_tpg_mutex); |
1977 | tv_nexus = tpg->tpg_nexus; | |
057cbf49 | 1978 | if (!tv_nexus) { |
98718312 | 1979 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1980 | return -ENODEV; |
1981 | } | |
1982 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1983 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
98718312 | 1984 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1985 | |
1986 | return ret; | |
1987 | } | |
1988 | ||
101998f6 | 1989 | static ssize_t tcm_vhost_tpg_store_nexus(struct se_portal_group *se_tpg, |
683bd967 AH |
1990 | const char *page, |
1991 | size_t count) | |
057cbf49 | 1992 | { |
98718312 | 1993 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, |
057cbf49 | 1994 | struct tcm_vhost_tpg, se_tpg); |
98718312 | 1995 | struct tcm_vhost_tport *tport_wwn = tpg->tport; |
057cbf49 NB |
1996 | unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr; |
1997 | int ret; | |
1998 | /* | |
1999 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
2000 | */ | |
2001 | if (!strncmp(page, "NULL", 4)) { | |
98718312 | 2002 | ret = tcm_vhost_drop_nexus(tpg); |
057cbf49 NB |
2003 | return (!ret) ? count : ret; |
2004 | } | |
2005 | /* | |
2006 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
2007 | * the fabric protocol_id set in tcm_vhost_make_tport(), and call | |
2008 | * tcm_vhost_make_nexus(). | |
2009 | */ | |
2010 | if (strlen(page) >= TCM_VHOST_NAMELEN) { | |
2011 | pr_err("Emulated NAA Sas Address: %s, exceeds" | |
2012 | " max: %d\n", page, TCM_VHOST_NAMELEN); | |
2013 | return -EINVAL; | |
2014 | } | |
2015 | snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page); | |
2016 | ||
2017 | ptr = strstr(i_port, "naa."); | |
2018 | if (ptr) { | |
2019 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
2020 | pr_err("Passed SAS Initiator Port %s does not" | |
2021 | " match target port protoid: %s\n", i_port, | |
2022 | tcm_vhost_dump_proto_id(tport_wwn)); | |
2023 | return -EINVAL; | |
2024 | } | |
2025 | port_ptr = &i_port[0]; | |
2026 | goto check_newline; | |
2027 | } | |
2028 | ptr = strstr(i_port, "fc."); | |
2029 | if (ptr) { | |
2030 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
2031 | pr_err("Passed FCP Initiator Port %s does not" | |
2032 | " match target port protoid: %s\n", i_port, | |
2033 | tcm_vhost_dump_proto_id(tport_wwn)); | |
2034 | return -EINVAL; | |
2035 | } | |
2036 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
2037 | goto check_newline; | |
2038 | } | |
2039 | ptr = strstr(i_port, "iqn."); | |
2040 | if (ptr) { | |
2041 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
2042 | pr_err("Passed iSCSI Initiator Port %s does not" | |
2043 | " match target port protoid: %s\n", i_port, | |
2044 | tcm_vhost_dump_proto_id(tport_wwn)); | |
2045 | return -EINVAL; | |
2046 | } | |
2047 | port_ptr = &i_port[0]; | |
2048 | goto check_newline; | |
2049 | } | |
2050 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
2051 | " %s\n", i_port); | |
2052 | return -EINVAL; | |
2053 | /* | |
2054 | * Clear any trailing newline for the NAA WWN | |
2055 | */ | |
2056 | check_newline: | |
2057 | if (i_port[strlen(i_port)-1] == '\n') | |
2058 | i_port[strlen(i_port)-1] = '\0'; | |
2059 | ||
98718312 | 2060 | ret = tcm_vhost_make_nexus(tpg, port_ptr); |
057cbf49 NB |
2061 | if (ret < 0) |
2062 | return ret; | |
2063 | ||
2064 | return count; | |
2065 | } | |
2066 | ||
2067 | TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR); | |
2068 | ||
2069 | static struct configfs_attribute *tcm_vhost_tpg_attrs[] = { | |
2070 | &tcm_vhost_tpg_nexus.attr, | |
2071 | NULL, | |
2072 | }; | |
2073 | ||
683bd967 AH |
2074 | static struct se_portal_group * |
2075 | tcm_vhost_make_tpg(struct se_wwn *wwn, | |
2076 | struct config_group *group, | |
2077 | const char *name) | |
057cbf49 NB |
2078 | { |
2079 | struct tcm_vhost_tport *tport = container_of(wwn, | |
2080 | struct tcm_vhost_tport, tport_wwn); | |
2081 | ||
2082 | struct tcm_vhost_tpg *tpg; | |
2083 | unsigned long tpgt; | |
2084 | int ret; | |
2085 | ||
2086 | if (strstr(name, "tpgt_") != name) | |
2087 | return ERR_PTR(-EINVAL); | |
2088 | if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX) | |
2089 | return ERR_PTR(-EINVAL); | |
2090 | ||
2091 | tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL); | |
2092 | if (!tpg) { | |
2093 | pr_err("Unable to allocate struct tcm_vhost_tpg"); | |
2094 | return ERR_PTR(-ENOMEM); | |
2095 | } | |
2096 | mutex_init(&tpg->tv_tpg_mutex); | |
2097 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
2098 | tpg->tport = tport; | |
2099 | tpg->tport_tpgt = tpgt; | |
2100 | ||
2101 | ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn, | |
2102 | &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL); | |
2103 | if (ret < 0) { | |
2104 | kfree(tpg); | |
2105 | return NULL; | |
2106 | } | |
2107 | mutex_lock(&tcm_vhost_mutex); | |
2108 | list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list); | |
2109 | mutex_unlock(&tcm_vhost_mutex); | |
2110 | ||
2111 | return &tpg->se_tpg; | |
2112 | } | |
2113 | ||
2114 | static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg) | |
2115 | { | |
2116 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
2117 | struct tcm_vhost_tpg, se_tpg); | |
2118 | ||
2119 | mutex_lock(&tcm_vhost_mutex); | |
2120 | list_del(&tpg->tv_tpg_list); | |
2121 | mutex_unlock(&tcm_vhost_mutex); | |
2122 | /* | |
101998f6 | 2123 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 NB |
2124 | */ |
2125 | tcm_vhost_drop_nexus(tpg); | |
2126 | /* | |
2127 | * Deregister the se_tpg from TCM.. | |
2128 | */ | |
2129 | core_tpg_deregister(se_tpg); | |
2130 | kfree(tpg); | |
2131 | } | |
2132 | ||
683bd967 AH |
2133 | static struct se_wwn * |
2134 | tcm_vhost_make_tport(struct target_fabric_configfs *tf, | |
2135 | struct config_group *group, | |
2136 | const char *name) | |
057cbf49 NB |
2137 | { |
2138 | struct tcm_vhost_tport *tport; | |
2139 | char *ptr; | |
2140 | u64 wwpn = 0; | |
2141 | int off = 0; | |
2142 | ||
2143 | /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0) | |
2144 | return ERR_PTR(-EINVAL); */ | |
2145 | ||
2146 | tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL); | |
2147 | if (!tport) { | |
2148 | pr_err("Unable to allocate struct tcm_vhost_tport"); | |
2149 | return ERR_PTR(-ENOMEM); | |
2150 | } | |
2151 | tport->tport_wwpn = wwpn; | |
2152 | /* | |
2153 | * Determine the emulated Protocol Identifier and Target Port Name | |
2154 | * based on the incoming configfs directory name. | |
2155 | */ | |
2156 | ptr = strstr(name, "naa."); | |
2157 | if (ptr) { | |
2158 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
2159 | goto check_len; | |
2160 | } | |
2161 | ptr = strstr(name, "fc."); | |
2162 | if (ptr) { | |
2163 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
2164 | off = 3; /* Skip over "fc." */ | |
2165 | goto check_len; | |
2166 | } | |
2167 | ptr = strstr(name, "iqn."); | |
2168 | if (ptr) { | |
2169 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
2170 | goto check_len; | |
2171 | } | |
2172 | ||
2173 | pr_err("Unable to locate prefix for emulated Target Port:" | |
2174 | " %s\n", name); | |
2175 | kfree(tport); | |
2176 | return ERR_PTR(-EINVAL); | |
2177 | ||
2178 | check_len: | |
2179 | if (strlen(name) >= TCM_VHOST_NAMELEN) { | |
2180 | pr_err("Emulated %s Address: %s, exceeds" | |
2181 | " max: %d\n", name, tcm_vhost_dump_proto_id(tport), | |
2182 | TCM_VHOST_NAMELEN); | |
2183 | kfree(tport); | |
2184 | return ERR_PTR(-EINVAL); | |
2185 | } | |
2186 | snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]); | |
2187 | ||
2188 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
2189 | " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name); | |
2190 | ||
2191 | return &tport->tport_wwn; | |
2192 | } | |
2193 | ||
2194 | static void tcm_vhost_drop_tport(struct se_wwn *wwn) | |
2195 | { | |
2196 | struct tcm_vhost_tport *tport = container_of(wwn, | |
2197 | struct tcm_vhost_tport, tport_wwn); | |
2198 | ||
2199 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
2200 | " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), | |
2201 | tport->tport_name); | |
2202 | ||
2203 | kfree(tport); | |
2204 | } | |
2205 | ||
683bd967 AH |
2206 | static ssize_t |
2207 | tcm_vhost_wwn_show_attr_version(struct target_fabric_configfs *tf, | |
2208 | char *page) | |
057cbf49 NB |
2209 | { |
2210 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" | |
2211 | "on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname, | |
2212 | utsname()->machine); | |
2213 | } | |
2214 | ||
2215 | TF_WWN_ATTR_RO(tcm_vhost, version); | |
2216 | ||
2217 | static struct configfs_attribute *tcm_vhost_wwn_attrs[] = { | |
2218 | &tcm_vhost_wwn_version.attr, | |
2219 | NULL, | |
2220 | }; | |
2221 | ||
2222 | static struct target_core_fabric_ops tcm_vhost_ops = { | |
2223 | .get_fabric_name = tcm_vhost_get_fabric_name, | |
2224 | .get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident, | |
2225 | .tpg_get_wwn = tcm_vhost_get_fabric_wwn, | |
2226 | .tpg_get_tag = tcm_vhost_get_tag, | |
2227 | .tpg_get_default_depth = tcm_vhost_get_default_depth, | |
2228 | .tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id, | |
2229 | .tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len, | |
2230 | .tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id, | |
2231 | .tpg_check_demo_mode = tcm_vhost_check_true, | |
2232 | .tpg_check_demo_mode_cache = tcm_vhost_check_true, | |
2233 | .tpg_check_demo_mode_write_protect = tcm_vhost_check_false, | |
2234 | .tpg_check_prod_mode_write_protect = tcm_vhost_check_false, | |
2235 | .tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl, | |
2236 | .tpg_release_fabric_acl = tcm_vhost_release_fabric_acl, | |
2237 | .tpg_get_inst_index = tcm_vhost_tpg_get_inst_index, | |
2238 | .release_cmd = tcm_vhost_release_cmd, | |
084ed45b | 2239 | .check_stop_free = vhost_scsi_check_stop_free, |
057cbf49 NB |
2240 | .shutdown_session = tcm_vhost_shutdown_session, |
2241 | .close_session = tcm_vhost_close_session, | |
2242 | .sess_get_index = tcm_vhost_sess_get_index, | |
2243 | .sess_get_initiator_sid = NULL, | |
2244 | .write_pending = tcm_vhost_write_pending, | |
2245 | .write_pending_status = tcm_vhost_write_pending_status, | |
2246 | .set_default_node_attributes = tcm_vhost_set_default_node_attrs, | |
2247 | .get_task_tag = tcm_vhost_get_task_tag, | |
2248 | .get_cmd_state = tcm_vhost_get_cmd_state, | |
2249 | .queue_data_in = tcm_vhost_queue_data_in, | |
2250 | .queue_status = tcm_vhost_queue_status, | |
2251 | .queue_tm_rsp = tcm_vhost_queue_tm_rsp, | |
131e6abc | 2252 | .aborted_task = tcm_vhost_aborted_task, |
057cbf49 NB |
2253 | /* |
2254 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
2255 | */ | |
2256 | .fabric_make_wwn = tcm_vhost_make_tport, | |
2257 | .fabric_drop_wwn = tcm_vhost_drop_tport, | |
2258 | .fabric_make_tpg = tcm_vhost_make_tpg, | |
2259 | .fabric_drop_tpg = tcm_vhost_drop_tpg, | |
2260 | .fabric_post_link = tcm_vhost_port_link, | |
2261 | .fabric_pre_unlink = tcm_vhost_port_unlink, | |
2262 | .fabric_make_np = NULL, | |
2263 | .fabric_drop_np = NULL, | |
2264 | .fabric_make_nodeacl = tcm_vhost_make_nodeacl, | |
2265 | .fabric_drop_nodeacl = tcm_vhost_drop_nodeacl, | |
2266 | }; | |
2267 | ||
2268 | static int tcm_vhost_register_configfs(void) | |
2269 | { | |
2270 | struct target_fabric_configfs *fabric; | |
2271 | int ret; | |
2272 | ||
2273 | pr_debug("TCM_VHOST fabric module %s on %s/%s" | |
2274 | " on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname, | |
2275 | utsname()->machine); | |
2276 | /* | |
2277 | * Register the top level struct config_item_type with TCM core | |
2278 | */ | |
2279 | fabric = target_fabric_configfs_init(THIS_MODULE, "vhost"); | |
2280 | if (IS_ERR(fabric)) { | |
2281 | pr_err("target_fabric_configfs_init() failed\n"); | |
2282 | return PTR_ERR(fabric); | |
2283 | } | |
2284 | /* | |
2285 | * Setup fabric->tf_ops from our local tcm_vhost_ops | |
2286 | */ | |
2287 | fabric->tf_ops = tcm_vhost_ops; | |
2288 | /* | |
2289 | * Setup default attribute lists for various fabric->tf_cit_tmpl | |
2290 | */ | |
d80e224d AG |
2291 | fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs; |
2292 | fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs; | |
2293 | fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL; | |
2294 | fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL; | |
2295 | fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL; | |
2296 | fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL; | |
2297 | fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL; | |
2298 | fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL; | |
2299 | fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL; | |
057cbf49 NB |
2300 | /* |
2301 | * Register the fabric for use within TCM | |
2302 | */ | |
2303 | ret = target_fabric_configfs_register(fabric); | |
2304 | if (ret < 0) { | |
2305 | pr_err("target_fabric_configfs_register() failed" | |
2306 | " for TCM_VHOST\n"); | |
2307 | return ret; | |
2308 | } | |
2309 | /* | |
2310 | * Setup our local pointer to *fabric | |
2311 | */ | |
2312 | tcm_vhost_fabric_configfs = fabric; | |
2313 | pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n"); | |
2314 | return 0; | |
2315 | }; | |
2316 | ||
2317 | static void tcm_vhost_deregister_configfs(void) | |
2318 | { | |
2319 | if (!tcm_vhost_fabric_configfs) | |
2320 | return; | |
2321 | ||
2322 | target_fabric_configfs_deregister(tcm_vhost_fabric_configfs); | |
2323 | tcm_vhost_fabric_configfs = NULL; | |
2324 | pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n"); | |
2325 | }; | |
2326 | ||
2327 | static int __init tcm_vhost_init(void) | |
2328 | { | |
2329 | int ret = -ENOMEM; | |
101998f6 NB |
2330 | /* |
2331 | * Use our own dedicated workqueue for submitting I/O into | |
2332 | * target core to avoid contention within system_wq. | |
2333 | */ | |
057cbf49 NB |
2334 | tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0); |
2335 | if (!tcm_vhost_workqueue) | |
2336 | goto out; | |
2337 | ||
2338 | ret = vhost_scsi_register(); | |
2339 | if (ret < 0) | |
2340 | goto out_destroy_workqueue; | |
2341 | ||
2342 | ret = tcm_vhost_register_configfs(); | |
2343 | if (ret < 0) | |
2344 | goto out_vhost_scsi_deregister; | |
2345 | ||
2346 | return 0; | |
2347 | ||
2348 | out_vhost_scsi_deregister: | |
2349 | vhost_scsi_deregister(); | |
2350 | out_destroy_workqueue: | |
2351 | destroy_workqueue(tcm_vhost_workqueue); | |
2352 | out: | |
2353 | return ret; | |
2354 | }; | |
2355 | ||
2356 | static void tcm_vhost_exit(void) | |
2357 | { | |
2358 | tcm_vhost_deregister_configfs(); | |
2359 | vhost_scsi_deregister(); | |
2360 | destroy_workqueue(tcm_vhost_workqueue); | |
2361 | }; | |
2362 | ||
181c04a3 MT |
2363 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
2364 | MODULE_ALIAS("tcm_vhost"); | |
057cbf49 NB |
2365 | MODULE_LICENSE("GPL"); |
2366 | module_init(tcm_vhost_init); | |
2367 | module_exit(tcm_vhost_exit); |