Commit | Line | Data |
---|---|---|
057cbf49 NB |
1 | /******************************************************************************* |
2 | * Vhost kernel TCM fabric driver for virtio SCSI initiators | |
3 | * | |
4 | * (C) Copyright 2010-2012 RisingTide Systems LLC. | |
5 | * (C) Copyright 2010-2012 IBM Corp. | |
6 | * | |
7 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. | |
8 | * | |
9 | * Authors: Nicholas A. Bellinger <nab@risingtidesystems.com> | |
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> |
057cbf49 NB |
51 | |
52 | #include "vhost.c" | |
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 | |
58 | ||
59 | struct vhost_scsi_inflight { | |
60 | /* Wait for the flush operation to finish */ | |
61 | struct completion comp; | |
62 | /* Refcount for the inflight reqs */ | |
63 | struct kref kref; | |
64 | }; | |
65 | ||
66 | struct tcm_vhost_cmd { | |
67 | /* Descriptor from vhost_get_vq_desc() for virt_queue segment */ | |
68 | int tvc_vq_desc; | |
69 | /* virtio-scsi initiator task attribute */ | |
70 | int tvc_task_attr; | |
71 | /* virtio-scsi initiator data direction */ | |
72 | enum dma_data_direction tvc_data_direction; | |
73 | /* Expected data transfer length from virtio-scsi header */ | |
74 | u32 tvc_exp_data_len; | |
75 | /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */ | |
76 | u64 tvc_tag; | |
77 | /* The number of scatterlists associated with this cmd */ | |
78 | u32 tvc_sgl_count; | |
79 | /* Saved unpacked SCSI LUN for tcm_vhost_submission_work() */ | |
80 | u32 tvc_lun; | |
81 | /* Pointer to the SGL formatted memory from virtio-scsi */ | |
82 | struct scatterlist *tvc_sgl; | |
83 | /* Pointer to response */ | |
84 | struct virtio_scsi_cmd_resp __user *tvc_resp; | |
85 | /* Pointer to vhost_scsi for our device */ | |
86 | struct vhost_scsi *tvc_vhost; | |
87 | /* Pointer to vhost_virtqueue for the cmd */ | |
88 | struct vhost_virtqueue *tvc_vq; | |
89 | /* Pointer to vhost nexus memory */ | |
90 | struct tcm_vhost_nexus *tvc_nexus; | |
91 | /* The TCM I/O descriptor that is accessed via container_of() */ | |
92 | struct se_cmd tvc_se_cmd; | |
93 | /* work item used for cmwq dispatch to tcm_vhost_submission_work() */ | |
94 | struct work_struct work; | |
95 | /* Copy of the incoming SCSI command descriptor block (CDB) */ | |
96 | unsigned char tvc_cdb[TCM_VHOST_MAX_CDB_SIZE]; | |
97 | /* Sense buffer that will be mapped into outgoing status */ | |
98 | unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER]; | |
99 | /* Completed commands list, serviced from vhost worker thread */ | |
100 | struct llist_node tvc_completion_list; | |
101 | /* Used to track inflight cmd */ | |
102 | struct vhost_scsi_inflight *inflight; | |
103 | }; | |
104 | ||
105 | struct tcm_vhost_nexus { | |
106 | /* Pointer to TCM session for I_T Nexus */ | |
107 | struct se_session *tvn_se_sess; | |
108 | }; | |
109 | ||
110 | struct tcm_vhost_nacl { | |
111 | /* Binary World Wide unique Port Name for Vhost Initiator port */ | |
112 | u64 iport_wwpn; | |
113 | /* ASCII formatted WWPN for Sas Initiator port */ | |
114 | char iport_name[TCM_VHOST_NAMELEN]; | |
115 | /* Returned by tcm_vhost_make_nodeacl() */ | |
116 | struct se_node_acl se_node_acl; | |
117 | }; | |
118 | ||
119 | struct vhost_scsi; | |
120 | struct tcm_vhost_tpg { | |
121 | /* Vhost port target portal group tag for TCM */ | |
122 | u16 tport_tpgt; | |
123 | /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */ | |
124 | int tv_tpg_port_count; | |
125 | /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */ | |
126 | int tv_tpg_vhost_count; | |
127 | /* list for tcm_vhost_list */ | |
128 | struct list_head tv_tpg_list; | |
129 | /* Used to protect access for tpg_nexus */ | |
130 | struct mutex tv_tpg_mutex; | |
131 | /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */ | |
132 | struct tcm_vhost_nexus *tpg_nexus; | |
133 | /* Pointer back to tcm_vhost_tport */ | |
134 | struct tcm_vhost_tport *tport; | |
135 | /* Returned by tcm_vhost_make_tpg() */ | |
136 | struct se_portal_group se_tpg; | |
137 | /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */ | |
138 | struct vhost_scsi *vhost_scsi; | |
139 | }; | |
140 | ||
141 | struct tcm_vhost_tport { | |
142 | /* SCSI protocol the tport is providing */ | |
143 | u8 tport_proto_id; | |
144 | /* Binary World Wide unique Port Name for Vhost Target port */ | |
145 | u64 tport_wwpn; | |
146 | /* ASCII formatted WWPN for Vhost Target port */ | |
147 | char tport_name[TCM_VHOST_NAMELEN]; | |
148 | /* Returned by tcm_vhost_make_tport() */ | |
149 | struct se_wwn tport_wwn; | |
150 | }; | |
151 | ||
152 | struct tcm_vhost_evt { | |
153 | /* event to be sent to guest */ | |
154 | struct virtio_scsi_event event; | |
155 | /* event list, serviced from vhost worker thread */ | |
156 | struct llist_node list; | |
157 | }; | |
057cbf49 | 158 | |
101998f6 NB |
159 | enum { |
160 | VHOST_SCSI_VQ_CTL = 0, | |
161 | VHOST_SCSI_VQ_EVT = 1, | |
162 | VHOST_SCSI_VQ_IO = 2, | |
163 | }; | |
164 | ||
5dade710 | 165 | enum { |
a18cc421 | 166 | VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
5dade710 NB |
167 | }; |
168 | ||
1b7f390e AH |
169 | #define VHOST_SCSI_MAX_TARGET 256 |
170 | #define VHOST_SCSI_MAX_VQ 128 | |
a6c9af87 | 171 | #define VHOST_SCSI_MAX_EVENT 128 |
67e18cf9 | 172 | |
3ab2e420 AH |
173 | struct vhost_scsi_virtqueue { |
174 | struct vhost_virtqueue vq; | |
3dfbff32 MT |
175 | /* |
176 | * Reference counting for inflight reqs, used for flush operation. At | |
177 | * each time, one reference tracks new commands submitted, while we | |
178 | * wait for another one to reach 0. | |
179 | */ | |
f2f0173d | 180 | struct vhost_scsi_inflight inflights[2]; |
3dfbff32 MT |
181 | /* |
182 | * Indicate current inflight in use, protected by vq->mutex. | |
183 | * Writers must also take dev mutex and flush under it. | |
184 | */ | |
f2f0173d | 185 | int inflight_idx; |
3ab2e420 AH |
186 | }; |
187 | ||
057cbf49 | 188 | struct vhost_scsi { |
67e18cf9 | 189 | /* Protected by vhost_scsi->dev.mutex */ |
4f7f46d3 | 190 | struct tcm_vhost_tpg **vs_tpg; |
67e18cf9 | 191 | char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
67e18cf9 | 192 | |
057cbf49 | 193 | struct vhost_dev dev; |
3ab2e420 | 194 | struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ]; |
057cbf49 NB |
195 | |
196 | struct vhost_work vs_completion_work; /* cmd completion work item */ | |
9d6064a3 | 197 | struct llist_head vs_completion_list; /* cmd completion queue */ |
a6c9af87 AH |
198 | |
199 | struct vhost_work vs_event_work; /* evt injection work item */ | |
200 | struct llist_head vs_event_list; /* evt injection queue */ | |
201 | ||
202 | bool vs_events_missed; /* any missed events, protected by vq->mutex */ | |
203 | int vs_events_nr; /* num of pending events, protected by vq->mutex */ | |
057cbf49 NB |
204 | }; |
205 | ||
206 | /* Local pointer to allocated TCM configfs fabric module */ | |
207 | static struct target_fabric_configfs *tcm_vhost_fabric_configfs; | |
208 | ||
209 | static struct workqueue_struct *tcm_vhost_workqueue; | |
210 | ||
211 | /* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */ | |
212 | static DEFINE_MUTEX(tcm_vhost_mutex); | |
213 | static LIST_HEAD(tcm_vhost_list); | |
214 | ||
765b34fd AH |
215 | static int iov_num_pages(struct iovec *iov) |
216 | { | |
217 | return (PAGE_ALIGN((unsigned long)iov->iov_base + iov->iov_len) - | |
218 | ((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT; | |
219 | } | |
220 | ||
f2f0173d AH |
221 | void tcm_vhost_done_inflight(struct kref *kref) |
222 | { | |
223 | struct vhost_scsi_inflight *inflight; | |
224 | ||
225 | inflight = container_of(kref, struct vhost_scsi_inflight, kref); | |
226 | complete(&inflight->comp); | |
227 | } | |
228 | ||
229 | static void tcm_vhost_init_inflight(struct vhost_scsi *vs, | |
230 | struct vhost_scsi_inflight *old_inflight[]) | |
231 | { | |
232 | struct vhost_scsi_inflight *new_inflight; | |
233 | struct vhost_virtqueue *vq; | |
234 | int idx, i; | |
235 | ||
236 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
237 | vq = &vs->vqs[i].vq; | |
238 | ||
239 | mutex_lock(&vq->mutex); | |
240 | ||
241 | /* store old infight */ | |
242 | idx = vs->vqs[i].inflight_idx; | |
243 | if (old_inflight) | |
244 | old_inflight[i] = &vs->vqs[i].inflights[idx]; | |
245 | ||
246 | /* setup new infight */ | |
247 | vs->vqs[i].inflight_idx = idx ^ 1; | |
248 | new_inflight = &vs->vqs[i].inflights[idx ^ 1]; | |
249 | kref_init(&new_inflight->kref); | |
250 | init_completion(&new_inflight->comp); | |
251 | ||
252 | mutex_unlock(&vq->mutex); | |
253 | } | |
254 | } | |
255 | ||
256 | static struct vhost_scsi_inflight * | |
257 | tcm_vhost_get_inflight(struct vhost_virtqueue *vq) | |
258 | { | |
259 | struct vhost_scsi_inflight *inflight; | |
260 | struct vhost_scsi_virtqueue *svq; | |
261 | ||
262 | svq = container_of(vq, struct vhost_scsi_virtqueue, vq); | |
263 | inflight = &svq->inflights[svq->inflight_idx]; | |
264 | kref_get(&inflight->kref); | |
265 | ||
266 | return inflight; | |
267 | } | |
268 | ||
269 | static void tcm_vhost_put_inflight(struct vhost_scsi_inflight *inflight) | |
270 | { | |
271 | kref_put(&inflight->kref, tcm_vhost_done_inflight); | |
272 | } | |
273 | ||
057cbf49 NB |
274 | static int tcm_vhost_check_true(struct se_portal_group *se_tpg) |
275 | { | |
276 | return 1; | |
277 | } | |
278 | ||
279 | static int tcm_vhost_check_false(struct se_portal_group *se_tpg) | |
280 | { | |
281 | return 0; | |
282 | } | |
283 | ||
284 | static char *tcm_vhost_get_fabric_name(void) | |
285 | { | |
286 | return "vhost"; | |
287 | } | |
288 | ||
289 | static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg) | |
290 | { | |
291 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
292 | struct tcm_vhost_tpg, se_tpg); | |
293 | struct tcm_vhost_tport *tport = tpg->tport; | |
294 | ||
295 | switch (tport->tport_proto_id) { | |
296 | case SCSI_PROTOCOL_SAS: | |
297 | return sas_get_fabric_proto_ident(se_tpg); | |
298 | case SCSI_PROTOCOL_FCP: | |
299 | return fc_get_fabric_proto_ident(se_tpg); | |
300 | case SCSI_PROTOCOL_ISCSI: | |
301 | return iscsi_get_fabric_proto_ident(se_tpg); | |
302 | default: | |
303 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
304 | " SAS emulation\n", tport->tport_proto_id); | |
305 | break; | |
306 | } | |
307 | ||
308 | return sas_get_fabric_proto_ident(se_tpg); | |
309 | } | |
310 | ||
311 | static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg) | |
312 | { | |
313 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
314 | struct tcm_vhost_tpg, se_tpg); | |
315 | struct tcm_vhost_tport *tport = tpg->tport; | |
316 | ||
317 | return &tport->tport_name[0]; | |
318 | } | |
319 | ||
320 | static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg) | |
321 | { | |
322 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
323 | struct tcm_vhost_tpg, se_tpg); | |
324 | return tpg->tport_tpgt; | |
325 | } | |
326 | ||
327 | static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg) | |
328 | { | |
329 | return 1; | |
330 | } | |
331 | ||
101998f6 | 332 | static u32 tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg, |
057cbf49 NB |
333 | struct se_node_acl *se_nacl, |
334 | struct t10_pr_registration *pr_reg, | |
335 | int *format_code, | |
336 | unsigned char *buf) | |
337 | { | |
338 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
339 | struct tcm_vhost_tpg, se_tpg); | |
340 | struct tcm_vhost_tport *tport = tpg->tport; | |
341 | ||
342 | switch (tport->tport_proto_id) { | |
343 | case SCSI_PROTOCOL_SAS: | |
344 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
345 | format_code, buf); | |
346 | case SCSI_PROTOCOL_FCP: | |
347 | return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
348 | format_code, buf); | |
349 | case SCSI_PROTOCOL_ISCSI: | |
350 | return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
351 | format_code, buf); | |
352 | default: | |
353 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
354 | " SAS emulation\n", tport->tport_proto_id); | |
355 | break; | |
356 | } | |
357 | ||
358 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
359 | format_code, buf); | |
360 | } | |
361 | ||
101998f6 | 362 | static u32 tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg, |
057cbf49 NB |
363 | struct se_node_acl *se_nacl, |
364 | struct t10_pr_registration *pr_reg, | |
365 | int *format_code) | |
366 | { | |
367 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
368 | struct tcm_vhost_tpg, se_tpg); | |
369 | struct tcm_vhost_tport *tport = tpg->tport; | |
370 | ||
371 | switch (tport->tport_proto_id) { | |
372 | case SCSI_PROTOCOL_SAS: | |
373 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
374 | format_code); | |
375 | case SCSI_PROTOCOL_FCP: | |
376 | return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
377 | format_code); | |
378 | case SCSI_PROTOCOL_ISCSI: | |
379 | return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
380 | format_code); | |
381 | default: | |
382 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
383 | " SAS emulation\n", tport->tport_proto_id); | |
384 | break; | |
385 | } | |
386 | ||
387 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
388 | format_code); | |
389 | } | |
390 | ||
101998f6 | 391 | static char *tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg, |
057cbf49 NB |
392 | const char *buf, |
393 | u32 *out_tid_len, | |
394 | char **port_nexus_ptr) | |
395 | { | |
396 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
397 | struct tcm_vhost_tpg, se_tpg); | |
398 | struct tcm_vhost_tport *tport = tpg->tport; | |
399 | ||
400 | switch (tport->tport_proto_id) { | |
401 | case SCSI_PROTOCOL_SAS: | |
402 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
403 | port_nexus_ptr); | |
404 | case SCSI_PROTOCOL_FCP: | |
405 | return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
406 | port_nexus_ptr); | |
407 | case SCSI_PROTOCOL_ISCSI: | |
408 | return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
409 | port_nexus_ptr); | |
410 | default: | |
411 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
412 | " SAS emulation\n", tport->tport_proto_id); | |
413 | break; | |
414 | } | |
415 | ||
416 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
417 | port_nexus_ptr); | |
418 | } | |
419 | ||
420 | static struct se_node_acl *tcm_vhost_alloc_fabric_acl( | |
421 | struct se_portal_group *se_tpg) | |
422 | { | |
423 | struct tcm_vhost_nacl *nacl; | |
424 | ||
425 | nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL); | |
426 | if (!nacl) { | |
744627e9 | 427 | pr_err("Unable to allocate struct tcm_vhost_nacl\n"); |
057cbf49 NB |
428 | return NULL; |
429 | } | |
430 | ||
431 | return &nacl->se_node_acl; | |
432 | } | |
433 | ||
101998f6 | 434 | static void tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg, |
057cbf49 NB |
435 | struct se_node_acl *se_nacl) |
436 | { | |
437 | struct tcm_vhost_nacl *nacl = container_of(se_nacl, | |
438 | struct tcm_vhost_nacl, se_node_acl); | |
439 | kfree(nacl); | |
440 | } | |
441 | ||
442 | static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg) | |
443 | { | |
444 | return 1; | |
445 | } | |
446 | ||
447 | static void tcm_vhost_release_cmd(struct se_cmd *se_cmd) | |
448 | { | |
449 | return; | |
450 | } | |
451 | ||
452 | static int tcm_vhost_shutdown_session(struct se_session *se_sess) | |
453 | { | |
454 | return 0; | |
455 | } | |
456 | ||
457 | static void tcm_vhost_close_session(struct se_session *se_sess) | |
458 | { | |
459 | return; | |
460 | } | |
461 | ||
462 | static u32 tcm_vhost_sess_get_index(struct se_session *se_sess) | |
463 | { | |
464 | return 0; | |
465 | } | |
466 | ||
467 | static int tcm_vhost_write_pending(struct se_cmd *se_cmd) | |
468 | { | |
469 | /* Go ahead and process the write immediately */ | |
470 | target_execute_cmd(se_cmd); | |
471 | return 0; | |
472 | } | |
473 | ||
474 | static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd) | |
475 | { | |
476 | return 0; | |
477 | } | |
478 | ||
479 | static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl) | |
480 | { | |
481 | return; | |
482 | } | |
483 | ||
484 | static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd) | |
485 | { | |
486 | return 0; | |
487 | } | |
488 | ||
489 | static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd) | |
490 | { | |
491 | return 0; | |
492 | } | |
493 | ||
101998f6 NB |
494 | static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *tv_cmd) |
495 | { | |
496 | struct vhost_scsi *vs = tv_cmd->tvc_vhost; | |
497 | ||
9d6064a3 | 498 | llist_add(&tv_cmd->tvc_completion_list, &vs->vs_completion_list); |
101998f6 NB |
499 | |
500 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
501 | } | |
057cbf49 NB |
502 | |
503 | static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd) | |
504 | { | |
505 | struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd, | |
506 | struct tcm_vhost_cmd, tvc_se_cmd); | |
507 | vhost_scsi_complete_cmd(tv_cmd); | |
508 | return 0; | |
509 | } | |
510 | ||
511 | static int tcm_vhost_queue_status(struct se_cmd *se_cmd) | |
512 | { | |
513 | struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd, | |
514 | struct tcm_vhost_cmd, tvc_se_cmd); | |
515 | vhost_scsi_complete_cmd(tv_cmd); | |
516 | return 0; | |
517 | } | |
518 | ||
519 | static int tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd) | |
520 | { | |
521 | return 0; | |
522 | } | |
523 | ||
a6c9af87 AH |
524 | static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt) |
525 | { | |
526 | vs->vs_events_nr--; | |
527 | kfree(evt); | |
528 | } | |
529 | ||
530 | static struct tcm_vhost_evt *tcm_vhost_allocate_evt(struct vhost_scsi *vs, | |
531 | u32 event, u32 reason) | |
532 | { | |
3ab2e420 | 533 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
534 | struct tcm_vhost_evt *evt; |
535 | ||
536 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
537 | vs->vs_events_missed = true; | |
538 | return NULL; | |
539 | } | |
540 | ||
541 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
542 | if (!evt) { | |
543 | vq_err(vq, "Failed to allocate tcm_vhost_evt\n"); | |
544 | vs->vs_events_missed = true; | |
545 | return NULL; | |
546 | } | |
547 | ||
548 | evt->event.event = event; | |
549 | evt->event.reason = reason; | |
550 | vs->vs_events_nr++; | |
551 | ||
552 | return evt; | |
553 | } | |
554 | ||
057cbf49 NB |
555 | static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd) |
556 | { | |
557 | struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd; | |
558 | ||
559 | /* TODO locking against target/backend threads? */ | |
560 | transport_generic_free_cmd(se_cmd, 1); | |
561 | ||
562 | if (tv_cmd->tvc_sgl_count) { | |
563 | u32 i; | |
564 | for (i = 0; i < tv_cmd->tvc_sgl_count; i++) | |
565 | put_page(sg_page(&tv_cmd->tvc_sgl[i])); | |
566 | ||
567 | kfree(tv_cmd->tvc_sgl); | |
568 | } | |
569 | ||
f2f0173d AH |
570 | tcm_vhost_put_inflight(tv_cmd->inflight); |
571 | ||
057cbf49 NB |
572 | kfree(tv_cmd); |
573 | } | |
574 | ||
a6c9af87 AH |
575 | static void tcm_vhost_do_evt_work(struct vhost_scsi *vs, |
576 | struct tcm_vhost_evt *evt) | |
577 | { | |
3ab2e420 | 578 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
579 | struct virtio_scsi_event *event = &evt->event; |
580 | struct virtio_scsi_event __user *eventp; | |
581 | unsigned out, in; | |
582 | int head, ret; | |
583 | ||
584 | if (!vq->private_data) { | |
585 | vs->vs_events_missed = true; | |
586 | return; | |
587 | } | |
588 | ||
589 | again: | |
590 | vhost_disable_notify(&vs->dev, vq); | |
591 | head = vhost_get_vq_desc(&vs->dev, vq, vq->iov, | |
592 | ARRAY_SIZE(vq->iov), &out, &in, | |
593 | NULL, NULL); | |
594 | if (head < 0) { | |
595 | vs->vs_events_missed = true; | |
596 | return; | |
597 | } | |
598 | if (head == vq->num) { | |
599 | if (vhost_enable_notify(&vs->dev, vq)) | |
600 | goto again; | |
601 | vs->vs_events_missed = true; | |
602 | return; | |
603 | } | |
604 | ||
605 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { | |
606 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", | |
607 | vq->iov[out].iov_len); | |
608 | vs->vs_events_missed = true; | |
609 | return; | |
610 | } | |
611 | ||
612 | if (vs->vs_events_missed) { | |
613 | event->event |= VIRTIO_SCSI_T_EVENTS_MISSED; | |
614 | vs->vs_events_missed = false; | |
615 | } | |
616 | ||
617 | eventp = vq->iov[out].iov_base; | |
618 | ret = __copy_to_user(eventp, event, sizeof(*event)); | |
619 | if (!ret) | |
620 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
621 | else | |
622 | vq_err(vq, "Faulted on tcm_vhost_send_event\n"); | |
623 | } | |
624 | ||
625 | static void tcm_vhost_evt_work(struct vhost_work *work) | |
626 | { | |
627 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
628 | vs_event_work); | |
3ab2e420 | 629 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
630 | struct tcm_vhost_evt *evt; |
631 | struct llist_node *llnode; | |
632 | ||
633 | mutex_lock(&vq->mutex); | |
634 | llnode = llist_del_all(&vs->vs_event_list); | |
635 | while (llnode) { | |
636 | evt = llist_entry(llnode, struct tcm_vhost_evt, list); | |
637 | llnode = llist_next(llnode); | |
638 | tcm_vhost_do_evt_work(vs, evt); | |
639 | tcm_vhost_free_evt(vs, evt); | |
640 | } | |
641 | mutex_unlock(&vq->mutex); | |
642 | } | |
643 | ||
057cbf49 NB |
644 | /* Fill in status and signal that we are done processing this command |
645 | * | |
646 | * This is scheduled in the vhost work queue so we are called with the owner | |
647 | * process mm and can access the vring. | |
648 | */ | |
649 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) | |
650 | { | |
651 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
652 | vs_completion_work); | |
1b7f390e | 653 | DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 654 | struct virtio_scsi_cmd_resp v_rsp; |
057cbf49 | 655 | struct tcm_vhost_cmd *tv_cmd; |
9d6064a3 AH |
656 | struct llist_node *llnode; |
657 | struct se_cmd *se_cmd; | |
1b7f390e | 658 | int ret, vq; |
057cbf49 | 659 | |
1b7f390e | 660 | bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 AH |
661 | llnode = llist_del_all(&vs->vs_completion_list); |
662 | while (llnode) { | |
663 | tv_cmd = llist_entry(llnode, struct tcm_vhost_cmd, | |
664 | tvc_completion_list); | |
665 | llnode = llist_next(llnode); | |
666 | se_cmd = &tv_cmd->tvc_se_cmd; | |
057cbf49 NB |
667 | |
668 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
669 | tv_cmd, se_cmd->residual_count, se_cmd->scsi_status); | |
670 | ||
671 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
672 | v_rsp.resid = se_cmd->residual_count; | |
673 | /* TODO is status_qualifier field needed? */ | |
674 | v_rsp.status = se_cmd->scsi_status; | |
675 | v_rsp.sense_len = se_cmd->scsi_sense_length; | |
676 | memcpy(v_rsp.sense, tv_cmd->tvc_sense_buf, | |
677 | v_rsp.sense_len); | |
678 | ret = copy_to_user(tv_cmd->tvc_resp, &v_rsp, sizeof(v_rsp)); | |
1b7f390e | 679 | if (likely(ret == 0)) { |
3ab2e420 | 680 | struct vhost_scsi_virtqueue *q; |
1b7f390e | 681 | vhost_add_used(tv_cmd->tvc_vq, tv_cmd->tvc_vq_desc, 0); |
3ab2e420 AH |
682 | q = container_of(tv_cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); |
683 | vq = q - vs->vqs; | |
1b7f390e AH |
684 | __set_bit(vq, signal); |
685 | } else | |
057cbf49 NB |
686 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
687 | ||
688 | vhost_scsi_free_cmd(tv_cmd); | |
689 | } | |
690 | ||
1b7f390e AH |
691 | vq = -1; |
692 | while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) | |
693 | < VHOST_SCSI_MAX_VQ) | |
3ab2e420 | 694 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
695 | } |
696 | ||
057cbf49 | 697 | static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd( |
f2f0173d | 698 | struct vhost_virtqueue *vq, |
057cbf49 NB |
699 | struct tcm_vhost_tpg *tv_tpg, |
700 | struct virtio_scsi_cmd_req *v_req, | |
701 | u32 exp_data_len, | |
702 | int data_direction) | |
703 | { | |
704 | struct tcm_vhost_cmd *tv_cmd; | |
705 | struct tcm_vhost_nexus *tv_nexus; | |
057cbf49 NB |
706 | |
707 | tv_nexus = tv_tpg->tpg_nexus; | |
708 | if (!tv_nexus) { | |
709 | pr_err("Unable to locate active struct tcm_vhost_nexus\n"); | |
710 | return ERR_PTR(-EIO); | |
711 | } | |
057cbf49 NB |
712 | |
713 | tv_cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC); | |
714 | if (!tv_cmd) { | |
715 | pr_err("Unable to allocate struct tcm_vhost_cmd\n"); | |
716 | return ERR_PTR(-ENOMEM); | |
717 | } | |
057cbf49 | 718 | tv_cmd->tvc_tag = v_req->tag; |
9f0abc15 NB |
719 | tv_cmd->tvc_task_attr = v_req->task_attr; |
720 | tv_cmd->tvc_exp_data_len = exp_data_len; | |
721 | tv_cmd->tvc_data_direction = data_direction; | |
722 | tv_cmd->tvc_nexus = tv_nexus; | |
f2f0173d | 723 | tv_cmd->inflight = tcm_vhost_get_inflight(vq); |
057cbf49 | 724 | |
057cbf49 NB |
725 | return tv_cmd; |
726 | } | |
727 | ||
728 | /* | |
729 | * Map a user memory range into a scatterlist | |
730 | * | |
731 | * Returns the number of scatterlist entries used or -errno on error. | |
732 | */ | |
733 | static int vhost_scsi_map_to_sgl(struct scatterlist *sgl, | |
1810053e | 734 | unsigned int sgl_count, struct iovec *iov, int write) |
057cbf49 | 735 | { |
1810053e | 736 | unsigned int npages = 0, pages_nr, offset, nbytes; |
057cbf49 | 737 | struct scatterlist *sg = sgl; |
1810053e AH |
738 | void __user *ptr = iov->iov_base; |
739 | size_t len = iov->iov_len; | |
740 | struct page **pages; | |
741 | int ret, i; | |
057cbf49 | 742 | |
1810053e AH |
743 | pages_nr = iov_num_pages(iov); |
744 | if (pages_nr > sgl_count) | |
745 | return -ENOBUFS; | |
057cbf49 | 746 | |
1810053e AH |
747 | pages = kmalloc(pages_nr * sizeof(struct page *), GFP_KERNEL); |
748 | if (!pages) | |
749 | return -ENOMEM; | |
057cbf49 | 750 | |
1810053e AH |
751 | ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages); |
752 | /* No pages were pinned */ | |
753 | if (ret < 0) | |
754 | goto out; | |
755 | /* Less pages pinned than wanted */ | |
756 | if (ret != pages_nr) { | |
757 | for (i = 0; i < ret; i++) | |
758 | put_page(pages[i]); | |
759 | ret = -EFAULT; | |
760 | goto out; | |
761 | } | |
762 | ||
763 | while (len > 0) { | |
764 | offset = (uintptr_t)ptr & ~PAGE_MASK; | |
765 | nbytes = min_t(unsigned int, PAGE_SIZE - offset, len); | |
766 | sg_set_page(sg, pages[npages], nbytes, offset); | |
057cbf49 NB |
767 | ptr += nbytes; |
768 | len -= nbytes; | |
769 | sg++; | |
770 | npages++; | |
771 | } | |
057cbf49 | 772 | |
1810053e AH |
773 | out: |
774 | kfree(pages); | |
057cbf49 NB |
775 | return ret; |
776 | } | |
777 | ||
778 | static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd, | |
779 | struct iovec *iov, unsigned int niov, int write) | |
780 | { | |
781 | int ret; | |
782 | unsigned int i; | |
783 | u32 sgl_count; | |
784 | struct scatterlist *sg; | |
785 | ||
786 | /* | |
787 | * Find out how long sglist needs to be | |
788 | */ | |
789 | sgl_count = 0; | |
f3158f36 AH |
790 | for (i = 0; i < niov; i++) |
791 | sgl_count += iov_num_pages(&iov[i]); | |
792 | ||
057cbf49 NB |
793 | /* TODO overflow checking */ |
794 | ||
795 | sg = kmalloc(sizeof(tv_cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC); | |
796 | if (!sg) | |
797 | return -ENOMEM; | |
f0e0e9bb FW |
798 | pr_debug("%s sg %p sgl_count %u is_err %d\n", __func__, |
799 | sg, sgl_count, !sg); | |
057cbf49 NB |
800 | sg_init_table(sg, sgl_count); |
801 | ||
802 | tv_cmd->tvc_sgl = sg; | |
803 | tv_cmd->tvc_sgl_count = sgl_count; | |
804 | ||
805 | pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count); | |
806 | for (i = 0; i < niov; i++) { | |
1810053e | 807 | ret = vhost_scsi_map_to_sgl(sg, sgl_count, &iov[i], write); |
057cbf49 NB |
808 | if (ret < 0) { |
809 | for (i = 0; i < tv_cmd->tvc_sgl_count; i++) | |
810 | put_page(sg_page(&tv_cmd->tvc_sgl[i])); | |
811 | kfree(tv_cmd->tvc_sgl); | |
812 | tv_cmd->tvc_sgl = NULL; | |
813 | tv_cmd->tvc_sgl_count = 0; | |
814 | return ret; | |
815 | } | |
816 | ||
817 | sg += ret; | |
818 | sgl_count -= ret; | |
819 | } | |
820 | return 0; | |
821 | } | |
822 | ||
823 | static void tcm_vhost_submission_work(struct work_struct *work) | |
824 | { | |
825 | struct tcm_vhost_cmd *tv_cmd = | |
826 | container_of(work, struct tcm_vhost_cmd, work); | |
9f0abc15 | 827 | struct tcm_vhost_nexus *tv_nexus; |
057cbf49 NB |
828 | struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd; |
829 | struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL; | |
830 | int rc, sg_no_bidi = 0; | |
057cbf49 NB |
831 | |
832 | if (tv_cmd->tvc_sgl_count) { | |
833 | sg_ptr = tv_cmd->tvc_sgl; | |
057cbf49 NB |
834 | /* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */ |
835 | #if 0 | |
836 | if (se_cmd->se_cmd_flags & SCF_BIDI) { | |
837 | sg_bidi_ptr = NULL; | |
838 | sg_no_bidi = 0; | |
839 | } | |
840 | #endif | |
841 | } else { | |
842 | sg_ptr = NULL; | |
843 | } | |
9f0abc15 NB |
844 | tv_nexus = tv_cmd->tvc_nexus; |
845 | ||
846 | rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, | |
847 | tv_cmd->tvc_cdb, &tv_cmd->tvc_sense_buf[0], | |
848 | tv_cmd->tvc_lun, tv_cmd->tvc_exp_data_len, | |
849 | tv_cmd->tvc_task_attr, tv_cmd->tvc_data_direction, | |
850 | 0, sg_ptr, tv_cmd->tvc_sgl_count, | |
851 | sg_bidi_ptr, sg_no_bidi); | |
057cbf49 NB |
852 | if (rc < 0) { |
853 | transport_send_check_condition_and_sense(se_cmd, | |
9f0abc15 | 854 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
057cbf49 | 855 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 856 | } |
057cbf49 NB |
857 | } |
858 | ||
637ab21e AH |
859 | static void vhost_scsi_send_bad_target(struct vhost_scsi *vs, |
860 | struct vhost_virtqueue *vq, int head, unsigned out) | |
861 | { | |
862 | struct virtio_scsi_cmd_resp __user *resp; | |
863 | struct virtio_scsi_cmd_resp rsp; | |
864 | int ret; | |
865 | ||
866 | memset(&rsp, 0, sizeof(rsp)); | |
867 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
868 | resp = vq->iov[out].iov_base; | |
869 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
870 | if (!ret) | |
871 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
872 | else | |
873 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
874 | } | |
875 | ||
1b7f390e AH |
876 | static void vhost_scsi_handle_vq(struct vhost_scsi *vs, |
877 | struct vhost_virtqueue *vq) | |
057cbf49 | 878 | { |
4f7f46d3 | 879 | struct tcm_vhost_tpg **vs_tpg; |
057cbf49 NB |
880 | struct virtio_scsi_cmd_req v_req; |
881 | struct tcm_vhost_tpg *tv_tpg; | |
882 | struct tcm_vhost_cmd *tv_cmd; | |
883 | u32 exp_data_len, data_first, data_num, data_direction; | |
884 | unsigned out, in, i; | |
885 | int head, ret; | |
67e18cf9 | 886 | u8 target; |
057cbf49 | 887 | |
4f7f46d3 AH |
888 | /* |
889 | * We can handle the vq only after the endpoint is setup by calling the | |
890 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
891 | * | |
892 | * TODO: Check that we are running from vhost_worker which acts | |
893 | * as read-side critical section for vhost kind of RCU. | |
894 | * See the comments in struct vhost_virtqueue in drivers/vhost/vhost.h | |
895 | */ | |
896 | vs_tpg = rcu_dereference_check(vq->private_data, 1); | |
897 | if (!vs_tpg) | |
057cbf49 | 898 | return; |
057cbf49 NB |
899 | |
900 | mutex_lock(&vq->mutex); | |
901 | vhost_disable_notify(&vs->dev, vq); | |
902 | ||
903 | for (;;) { | |
904 | head = vhost_get_vq_desc(&vs->dev, vq, vq->iov, | |
905 | ARRAY_SIZE(vq->iov), &out, &in, | |
906 | NULL, NULL); | |
907 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", | |
908 | head, out, in); | |
909 | /* On error, stop handling until the next kick. */ | |
910 | if (unlikely(head < 0)) | |
911 | break; | |
912 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
913 | if (head == vq->num) { | |
914 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
915 | vhost_disable_notify(&vs->dev, vq); | |
916 | continue; | |
917 | } | |
918 | break; | |
919 | } | |
920 | ||
921 | /* FIXME: BIDI operation */ | |
922 | if (out == 1 && in == 1) { | |
923 | data_direction = DMA_NONE; | |
924 | data_first = 0; | |
925 | data_num = 0; | |
926 | } else if (out == 1 && in > 1) { | |
927 | data_direction = DMA_FROM_DEVICE; | |
928 | data_first = out + 1; | |
929 | data_num = in - 1; | |
930 | } else if (out > 1 && in == 1) { | |
931 | data_direction = DMA_TO_DEVICE; | |
932 | data_first = 1; | |
933 | data_num = out - 1; | |
934 | } else { | |
935 | vq_err(vq, "Invalid buffer layout out: %u in: %u\n", | |
936 | out, in); | |
937 | break; | |
938 | } | |
939 | ||
940 | /* | |
941 | * Check for a sane resp buffer so we can report errors to | |
942 | * the guest. | |
943 | */ | |
944 | if (unlikely(vq->iov[out].iov_len != | |
945 | sizeof(struct virtio_scsi_cmd_resp))) { | |
946 | vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu" | |
947 | " bytes\n", vq->iov[out].iov_len); | |
948 | break; | |
949 | } | |
950 | ||
951 | if (unlikely(vq->iov[0].iov_len != sizeof(v_req))) { | |
952 | vq_err(vq, "Expecting virtio_scsi_cmd_req, got %zu" | |
953 | " bytes\n", vq->iov[0].iov_len); | |
954 | break; | |
955 | } | |
956 | pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p," | |
957 | " len: %zu\n", vq->iov[0].iov_base, sizeof(v_req)); | |
958 | ret = __copy_from_user(&v_req, vq->iov[0].iov_base, | |
959 | sizeof(v_req)); | |
960 | if (unlikely(ret)) { | |
961 | vq_err(vq, "Faulted on virtio_scsi_cmd_req\n"); | |
962 | break; | |
963 | } | |
964 | ||
67e18cf9 AH |
965 | /* Extract the tpgt */ |
966 | target = v_req.lun[1]; | |
4f7f46d3 | 967 | tv_tpg = ACCESS_ONCE(vs_tpg[target]); |
67e18cf9 AH |
968 | |
969 | /* Target does not exist, fail the request */ | |
970 | if (unlikely(!tv_tpg)) { | |
637ab21e | 971 | vhost_scsi_send_bad_target(vs, vq, head, out); |
67e18cf9 AH |
972 | continue; |
973 | } | |
974 | ||
057cbf49 NB |
975 | exp_data_len = 0; |
976 | for (i = 0; i < data_num; i++) | |
977 | exp_data_len += vq->iov[data_first + i].iov_len; | |
978 | ||
f2f0173d | 979 | tv_cmd = vhost_scsi_allocate_cmd(vq, tv_tpg, &v_req, |
057cbf49 NB |
980 | exp_data_len, data_direction); |
981 | if (IS_ERR(tv_cmd)) { | |
982 | vq_err(vq, "vhost_scsi_allocate_cmd failed %ld\n", | |
983 | PTR_ERR(tv_cmd)); | |
055f648c | 984 | goto err_cmd; |
057cbf49 NB |
985 | } |
986 | pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction" | |
987 | ": %d\n", tv_cmd, exp_data_len, data_direction); | |
988 | ||
989 | tv_cmd->tvc_vhost = vs; | |
1b7f390e | 990 | tv_cmd->tvc_vq = vq; |
057cbf49 NB |
991 | tv_cmd->tvc_resp = vq->iov[out].iov_base; |
992 | ||
993 | /* | |
994 | * Copy in the recieved CDB descriptor into tv_cmd->tvc_cdb | |
995 | * that will be used by tcm_vhost_new_cmd_map() and down into | |
996 | * target_setup_cmd_from_cdb() | |
997 | */ | |
998 | memcpy(tv_cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE); | |
999 | /* | |
1000 | * Check that the recieved CDB size does not exceeded our | |
1001 | * hardcoded max for tcm_vhost | |
1002 | */ | |
1003 | /* TODO what if cdb was too small for varlen cdb header? */ | |
1004 | if (unlikely(scsi_command_size(tv_cmd->tvc_cdb) > | |
1005 | TCM_VHOST_MAX_CDB_SIZE)) { | |
1006 | vq_err(vq, "Received SCSI CDB with command_size: %d that" | |
1007 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
1008 | scsi_command_size(tv_cmd->tvc_cdb), | |
1009 | TCM_VHOST_MAX_CDB_SIZE); | |
055f648c | 1010 | goto err_free; |
057cbf49 NB |
1011 | } |
1012 | tv_cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; | |
1013 | ||
1014 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", | |
1015 | tv_cmd->tvc_cdb[0], tv_cmd->tvc_lun); | |
1016 | ||
1017 | if (data_direction != DMA_NONE) { | |
1018 | ret = vhost_scsi_map_iov_to_sgl(tv_cmd, | |
1019 | &vq->iov[data_first], data_num, | |
1020 | data_direction == DMA_TO_DEVICE); | |
1021 | if (unlikely(ret)) { | |
1022 | vq_err(vq, "Failed to map iov to sgl\n"); | |
055f648c | 1023 | goto err_free; |
057cbf49 NB |
1024 | } |
1025 | } | |
1026 | ||
1027 | /* | |
1028 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
1029 | * complete the virtio-scsi request in TCM callback context via | |
1030 | * tcm_vhost_queue_data_in() and tcm_vhost_queue_status() | |
1031 | */ | |
1032 | tv_cmd->tvc_vq_desc = head; | |
1033 | /* | |
1034 | * Dispatch tv_cmd descriptor for cmwq execution in process | |
1035 | * context provided by tcm_vhost_workqueue. This also ensures | |
1036 | * tv_cmd is executed on the same kworker CPU as this vhost | |
1037 | * thread to gain positive L2 cache locality effects.. | |
1038 | */ | |
1039 | INIT_WORK(&tv_cmd->work, tcm_vhost_submission_work); | |
1040 | queue_work(tcm_vhost_workqueue, &tv_cmd->work); | |
1041 | } | |
1042 | ||
1043 | mutex_unlock(&vq->mutex); | |
7ea206cf AH |
1044 | return; |
1045 | ||
055f648c | 1046 | err_free: |
7ea206cf | 1047 | vhost_scsi_free_cmd(tv_cmd); |
055f648c AH |
1048 | err_cmd: |
1049 | vhost_scsi_send_bad_target(vs, vq, head, out); | |
7ea206cf | 1050 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
1051 | } |
1052 | ||
1053 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) | |
1054 | { | |
101998f6 | 1055 | pr_debug("%s: The handling func for control queue.\n", __func__); |
057cbf49 NB |
1056 | } |
1057 | ||
a6c9af87 AH |
1058 | static void tcm_vhost_send_evt(struct vhost_scsi *vs, struct tcm_vhost_tpg *tpg, |
1059 | struct se_lun *lun, u32 event, u32 reason) | |
1060 | { | |
1061 | struct tcm_vhost_evt *evt; | |
1062 | ||
1063 | evt = tcm_vhost_allocate_evt(vs, event, reason); | |
1064 | if (!evt) | |
1065 | return; | |
1066 | ||
1067 | if (tpg && lun) { | |
1068 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
1069 | /* | |
1070 | * Note: evt->event is zeroed when we allocate it and | |
1071 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
1072 | */ | |
1073 | evt->event.lun[0] = 0x01; | |
1074 | evt->event.lun[1] = tpg->tport_tpgt & 0xFF; | |
1075 | if (lun->unpacked_lun >= 256) | |
1076 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
1077 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
1078 | } | |
1079 | ||
1080 | llist_add(&evt->list, &vs->vs_event_list); | |
1081 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
1082 | } | |
1083 | ||
057cbf49 NB |
1084 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
1085 | { | |
a6c9af87 AH |
1086 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1087 | poll.work); | |
1088 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1089 | ||
1090 | mutex_lock(&vq->mutex); | |
1091 | if (!vq->private_data) | |
1092 | goto out; | |
1093 | ||
1094 | if (vs->vs_events_missed) | |
1095 | tcm_vhost_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); | |
1096 | out: | |
1097 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
1098 | } |
1099 | ||
1100 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
1101 | { | |
1102 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
1103 | poll.work); | |
1104 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1105 | ||
1b7f390e | 1106 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
1107 | } |
1108 | ||
4f7f46d3 AH |
1109 | static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
1110 | { | |
3ab2e420 | 1111 | vhost_poll_flush(&vs->vqs[index].vq.poll); |
4f7f46d3 AH |
1112 | } |
1113 | ||
3dfbff32 | 1114 | /* Callers must hold dev mutex */ |
4f7f46d3 AH |
1115 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
1116 | { | |
f2f0173d | 1117 | struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; |
4f7f46d3 AH |
1118 | int i; |
1119 | ||
f2f0173d AH |
1120 | /* Init new inflight and remember the old inflight */ |
1121 | tcm_vhost_init_inflight(vs, old_inflight); | |
1122 | ||
1123 | /* | |
1124 | * The inflight->kref was initialized to 1. We decrement it here to | |
1125 | * indicate the start of the flush operation so that it will reach 0 | |
1126 | * when all the reqs are finished. | |
1127 | */ | |
1128 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1129 | kref_put(&old_inflight[i]->kref, tcm_vhost_done_inflight); | |
1130 | ||
1131 | /* Flush both the vhost poll and vhost work */ | |
4f7f46d3 AH |
1132 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
1133 | vhost_scsi_flush_vq(vs, i); | |
1134 | vhost_work_flush(&vs->dev, &vs->vs_completion_work); | |
a6c9af87 | 1135 | vhost_work_flush(&vs->dev, &vs->vs_event_work); |
f2f0173d AH |
1136 | |
1137 | /* Wait for all reqs issued before the flush to be finished */ | |
1138 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1139 | wait_for_completion(&old_inflight[i]->comp); | |
4f7f46d3 AH |
1140 | } |
1141 | ||
057cbf49 NB |
1142 | /* |
1143 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
1144 | * tcm_vhost_tpg with an active struct tcm_vhost_nexus | |
f2b7daf5 AH |
1145 | * |
1146 | * The lock nesting rule is: | |
1147 | * tcm_vhost_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex | |
057cbf49 NB |
1148 | */ |
1149 | static int vhost_scsi_set_endpoint( | |
1150 | struct vhost_scsi *vs, | |
1151 | struct vhost_scsi_target *t) | |
1152 | { | |
1153 | struct tcm_vhost_tport *tv_tport; | |
1154 | struct tcm_vhost_tpg *tv_tpg; | |
4f7f46d3 AH |
1155 | struct tcm_vhost_tpg **vs_tpg; |
1156 | struct vhost_virtqueue *vq; | |
1157 | int index, ret, i, len; | |
67e18cf9 | 1158 | bool match = false; |
057cbf49 | 1159 | |
f2b7daf5 | 1160 | mutex_lock(&tcm_vhost_mutex); |
057cbf49 | 1161 | mutex_lock(&vs->dev.mutex); |
f2b7daf5 | 1162 | |
057cbf49 NB |
1163 | /* Verify that ring has been setup correctly. */ |
1164 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
1165 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 1166 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
1167 | ret = -EFAULT; |
1168 | goto out; | |
057cbf49 NB |
1169 | } |
1170 | } | |
057cbf49 | 1171 | |
4f7f46d3 AH |
1172 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
1173 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
1174 | if (!vs_tpg) { | |
f2b7daf5 AH |
1175 | ret = -ENOMEM; |
1176 | goto out; | |
4f7f46d3 AH |
1177 | } |
1178 | if (vs->vs_tpg) | |
1179 | memcpy(vs_tpg, vs->vs_tpg, len); | |
1180 | ||
057cbf49 NB |
1181 | list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) { |
1182 | mutex_lock(&tv_tpg->tv_tpg_mutex); | |
1183 | if (!tv_tpg->tpg_nexus) { | |
1184 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1185 | continue; | |
1186 | } | |
101998f6 | 1187 | if (tv_tpg->tv_tpg_vhost_count != 0) { |
057cbf49 NB |
1188 | mutex_unlock(&tv_tpg->tv_tpg_mutex); |
1189 | continue; | |
1190 | } | |
1191 | tv_tport = tv_tpg->tport; | |
1192 | ||
67e18cf9 | 1193 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
4f7f46d3 | 1194 | if (vs->vs_tpg && vs->vs_tpg[tv_tpg->tport_tpgt]) { |
4f7f46d3 | 1195 | kfree(vs_tpg); |
f2b7daf5 AH |
1196 | mutex_unlock(&tv_tpg->tv_tpg_mutex); |
1197 | ret = -EEXIST; | |
1198 | goto out; | |
101998f6 | 1199 | } |
67e18cf9 | 1200 | tv_tpg->tv_tpg_vhost_count++; |
a6c9af87 | 1201 | tv_tpg->vhost_scsi = vs; |
4f7f46d3 | 1202 | vs_tpg[tv_tpg->tport_tpgt] = tv_tpg; |
057cbf49 | 1203 | smp_mb__after_atomic_inc(); |
67e18cf9 | 1204 | match = true; |
057cbf49 NB |
1205 | } |
1206 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1207 | } | |
67e18cf9 AH |
1208 | |
1209 | if (match) { | |
1210 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1211 | sizeof(vs->vs_vhost_wwpn)); | |
4f7f46d3 | 1212 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
3ab2e420 | 1213 | vq = &vs->vqs[i].vq; |
4f7f46d3 AH |
1214 | /* Flushing the vhost_work acts as synchronize_rcu */ |
1215 | mutex_lock(&vq->mutex); | |
1216 | rcu_assign_pointer(vq->private_data, vs_tpg); | |
dfd5d569 | 1217 | vhost_init_used(vq); |
4f7f46d3 AH |
1218 | mutex_unlock(&vq->mutex); |
1219 | } | |
67e18cf9 AH |
1220 | ret = 0; |
1221 | } else { | |
1222 | ret = -EEXIST; | |
1223 | } | |
1224 | ||
4f7f46d3 AH |
1225 | /* |
1226 | * Act as synchronize_rcu to make sure access to | |
1227 | * old vs->vs_tpg is finished. | |
1228 | */ | |
1229 | vhost_scsi_flush(vs); | |
1230 | kfree(vs->vs_tpg); | |
1231 | vs->vs_tpg = vs_tpg; | |
1232 | ||
f2b7daf5 | 1233 | out: |
67e18cf9 | 1234 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1235 | mutex_unlock(&tcm_vhost_mutex); |
67e18cf9 | 1236 | return ret; |
057cbf49 NB |
1237 | } |
1238 | ||
1239 | static int vhost_scsi_clear_endpoint( | |
1240 | struct vhost_scsi *vs, | |
1241 | struct vhost_scsi_target *t) | |
1242 | { | |
1243 | struct tcm_vhost_tport *tv_tport; | |
1244 | struct tcm_vhost_tpg *tv_tpg; | |
4f7f46d3 AH |
1245 | struct vhost_virtqueue *vq; |
1246 | bool match = false; | |
67e18cf9 AH |
1247 | int index, ret, i; |
1248 | u8 target; | |
057cbf49 | 1249 | |
f2b7daf5 | 1250 | mutex_lock(&tcm_vhost_mutex); |
057cbf49 NB |
1251 | mutex_lock(&vs->dev.mutex); |
1252 | /* Verify that ring has been setup correctly. */ | |
1253 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1254 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1255 | ret = -EFAULT; |
038e0af4 | 1256 | goto err_dev; |
057cbf49 NB |
1257 | } |
1258 | } | |
4f7f46d3 AH |
1259 | |
1260 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1261 | ret = 0; |
1262 | goto err_dev; | |
4f7f46d3 AH |
1263 | } |
1264 | ||
67e18cf9 AH |
1265 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1266 | target = i; | |
67e18cf9 AH |
1267 | tv_tpg = vs->vs_tpg[target]; |
1268 | if (!tv_tpg) | |
1269 | continue; | |
1270 | ||
038e0af4 | 1271 | mutex_lock(&tv_tpg->tv_tpg_mutex); |
67e18cf9 AH |
1272 | tv_tport = tv_tpg->tport; |
1273 | if (!tv_tport) { | |
1274 | ret = -ENODEV; | |
038e0af4 | 1275 | goto err_tpg; |
67e18cf9 AH |
1276 | } |
1277 | ||
1278 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
1279 | pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu" | |
1280 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", | |
1281 | tv_tport->tport_name, tv_tpg->tport_tpgt, | |
1282 | t->vhost_wwpn, t->vhost_tpgt); | |
1283 | ret = -EINVAL; | |
038e0af4 | 1284 | goto err_tpg; |
67e18cf9 AH |
1285 | } |
1286 | tv_tpg->tv_tpg_vhost_count--; | |
a6c9af87 | 1287 | tv_tpg->vhost_scsi = NULL; |
67e18cf9 | 1288 | vs->vs_tpg[target] = NULL; |
4f7f46d3 | 1289 | match = true; |
038e0af4 | 1290 | mutex_unlock(&tv_tpg->tv_tpg_mutex); |
057cbf49 | 1291 | } |
4f7f46d3 AH |
1292 | if (match) { |
1293 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
3ab2e420 | 1294 | vq = &vs->vqs[i].vq; |
4f7f46d3 AH |
1295 | /* Flushing the vhost_work acts as synchronize_rcu */ |
1296 | mutex_lock(&vq->mutex); | |
1297 | rcu_assign_pointer(vq->private_data, NULL); | |
1298 | mutex_unlock(&vq->mutex); | |
1299 | } | |
1300 | } | |
1301 | /* | |
1302 | * Act as synchronize_rcu to make sure access to | |
1303 | * old vs->vs_tpg is finished. | |
1304 | */ | |
1305 | vhost_scsi_flush(vs); | |
1306 | kfree(vs->vs_tpg); | |
1307 | vs->vs_tpg = NULL; | |
a6c9af87 | 1308 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1309 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1310 | mutex_unlock(&tcm_vhost_mutex); |
057cbf49 | 1311 | return 0; |
101998f6 | 1312 | |
038e0af4 AH |
1313 | err_tpg: |
1314 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1315 | err_dev: | |
101998f6 | 1316 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1317 | mutex_unlock(&tcm_vhost_mutex); |
101998f6 | 1318 | return ret; |
057cbf49 NB |
1319 | } |
1320 | ||
4f7f46d3 AH |
1321 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1322 | { | |
1323 | if (features & ~VHOST_SCSI_FEATURES) | |
1324 | return -EOPNOTSUPP; | |
1325 | ||
1326 | mutex_lock(&vs->dev.mutex); | |
1327 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1328 | !vhost_log_access_ok(&vs->dev)) { | |
1329 | mutex_unlock(&vs->dev.mutex); | |
1330 | return -EFAULT; | |
1331 | } | |
1332 | vs->dev.acked_features = features; | |
1333 | smp_wmb(); | |
1334 | vhost_scsi_flush(vs); | |
1335 | mutex_unlock(&vs->dev.mutex); | |
1336 | return 0; | |
1337 | } | |
1338 | ||
057cbf49 NB |
1339 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1340 | { | |
1341 | struct vhost_scsi *s; | |
3ab2e420 | 1342 | struct vhost_virtqueue **vqs; |
1b7f390e | 1343 | int r, i; |
057cbf49 NB |
1344 | |
1345 | s = kzalloc(sizeof(*s), GFP_KERNEL); | |
1346 | if (!s) | |
1347 | return -ENOMEM; | |
1348 | ||
3ab2e420 AH |
1349 | vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL); |
1350 | if (!vqs) { | |
1351 | kfree(s); | |
1352 | return -ENOMEM; | |
1353 | } | |
1354 | ||
057cbf49 | 1355 | vhost_work_init(&s->vs_completion_work, vhost_scsi_complete_cmd_work); |
a6c9af87 AH |
1356 | vhost_work_init(&s->vs_event_work, tcm_vhost_evt_work); |
1357 | ||
1358 | s->vs_events_nr = 0; | |
1359 | s->vs_events_missed = false; | |
057cbf49 | 1360 | |
3ab2e420 AH |
1361 | vqs[VHOST_SCSI_VQ_CTL] = &s->vqs[VHOST_SCSI_VQ_CTL].vq; |
1362 | vqs[VHOST_SCSI_VQ_EVT] = &s->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1363 | s->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1364 | s->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
1365 | for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { | |
1366 | vqs[i] = &s->vqs[i].vq; | |
1367 | s->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
1368 | } | |
1369 | r = vhost_dev_init(&s->dev, vqs, VHOST_SCSI_MAX_VQ); | |
f2f0173d AH |
1370 | |
1371 | tcm_vhost_init_inflight(s, NULL); | |
1372 | ||
057cbf49 | 1373 | if (r < 0) { |
3ab2e420 | 1374 | kfree(vqs); |
057cbf49 NB |
1375 | kfree(s); |
1376 | return r; | |
1377 | } | |
1378 | ||
1379 | f->private_data = s; | |
1380 | return 0; | |
1381 | } | |
1382 | ||
1383 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1384 | { | |
1385 | struct vhost_scsi *s = f->private_data; | |
67e18cf9 | 1386 | struct vhost_scsi_target t; |
057cbf49 | 1387 | |
67e18cf9 AH |
1388 | mutex_lock(&s->dev.mutex); |
1389 | memcpy(t.vhost_wwpn, s->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1390 | mutex_unlock(&s->dev.mutex); | |
1391 | vhost_scsi_clear_endpoint(s, &t); | |
b211616d | 1392 | vhost_dev_stop(&s->dev); |
057cbf49 | 1393 | vhost_dev_cleanup(&s->dev, false); |
a6c9af87 AH |
1394 | /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
1395 | vhost_scsi_flush(s); | |
3ab2e420 | 1396 | kfree(s->dev.vqs); |
057cbf49 NB |
1397 | kfree(s); |
1398 | return 0; | |
1399 | } | |
1400 | ||
057cbf49 NB |
1401 | static long vhost_scsi_ioctl(struct file *f, unsigned int ioctl, |
1402 | unsigned long arg) | |
1403 | { | |
1404 | struct vhost_scsi *vs = f->private_data; | |
1405 | struct vhost_scsi_target backend; | |
1406 | void __user *argp = (void __user *)arg; | |
1407 | u64 __user *featurep = argp; | |
11c63418 AH |
1408 | u32 __user *eventsp = argp; |
1409 | u32 events_missed; | |
057cbf49 | 1410 | u64 features; |
101998f6 | 1411 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1412 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1413 | |
1414 | switch (ioctl) { | |
1415 | case VHOST_SCSI_SET_ENDPOINT: | |
1416 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1417 | return -EFAULT; | |
6de7145c MT |
1418 | if (backend.reserved != 0) |
1419 | return -EOPNOTSUPP; | |
057cbf49 NB |
1420 | |
1421 | return vhost_scsi_set_endpoint(vs, &backend); | |
1422 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1423 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1424 | return -EFAULT; | |
6de7145c MT |
1425 | if (backend.reserved != 0) |
1426 | return -EOPNOTSUPP; | |
057cbf49 NB |
1427 | |
1428 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1429 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1430 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1431 | return -EFAULT; |
1432 | return 0; | |
11c63418 AH |
1433 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1434 | if (get_user(events_missed, eventsp)) | |
1435 | return -EFAULT; | |
1436 | mutex_lock(&vq->mutex); | |
1437 | vs->vs_events_missed = events_missed; | |
1438 | mutex_unlock(&vq->mutex); | |
1439 | return 0; | |
1440 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1441 | mutex_lock(&vq->mutex); | |
1442 | events_missed = vs->vs_events_missed; | |
1443 | mutex_unlock(&vq->mutex); | |
1444 | if (put_user(events_missed, eventsp)) | |
1445 | return -EFAULT; | |
1446 | return 0; | |
057cbf49 | 1447 | case VHOST_GET_FEATURES: |
5dade710 | 1448 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1449 | if (copy_to_user(featurep, &features, sizeof features)) |
1450 | return -EFAULT; | |
1451 | return 0; | |
1452 | case VHOST_SET_FEATURES: | |
1453 | if (copy_from_user(&features, featurep, sizeof features)) | |
1454 | return -EFAULT; | |
1455 | return vhost_scsi_set_features(vs, features); | |
1456 | default: | |
1457 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1458 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1459 | /* TODO: flush backend after dev ioctl. */ | |
1460 | if (r == -ENOIOCTLCMD) | |
1461 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1462 | mutex_unlock(&vs->dev.mutex); |
1463 | return r; | |
1464 | } | |
1465 | } | |
1466 | ||
101998f6 NB |
1467 | #ifdef CONFIG_COMPAT |
1468 | static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, | |
1469 | unsigned long arg) | |
1470 | { | |
1471 | return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1472 | } | |
1473 | #endif | |
1474 | ||
057cbf49 NB |
1475 | static const struct file_operations vhost_scsi_fops = { |
1476 | .owner = THIS_MODULE, | |
1477 | .release = vhost_scsi_release, | |
1478 | .unlocked_ioctl = vhost_scsi_ioctl, | |
101998f6 NB |
1479 | #ifdef CONFIG_COMPAT |
1480 | .compat_ioctl = vhost_scsi_compat_ioctl, | |
1481 | #endif | |
057cbf49 NB |
1482 | .open = vhost_scsi_open, |
1483 | .llseek = noop_llseek, | |
1484 | }; | |
1485 | ||
1486 | static struct miscdevice vhost_scsi_misc = { | |
1487 | MISC_DYNAMIC_MINOR, | |
1488 | "vhost-scsi", | |
1489 | &vhost_scsi_fops, | |
1490 | }; | |
1491 | ||
1492 | static int __init vhost_scsi_register(void) | |
1493 | { | |
1494 | return misc_register(&vhost_scsi_misc); | |
1495 | } | |
1496 | ||
1497 | static int vhost_scsi_deregister(void) | |
1498 | { | |
1499 | return misc_deregister(&vhost_scsi_misc); | |
1500 | } | |
1501 | ||
1502 | static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport) | |
1503 | { | |
1504 | switch (tport->tport_proto_id) { | |
1505 | case SCSI_PROTOCOL_SAS: | |
1506 | return "SAS"; | |
1507 | case SCSI_PROTOCOL_FCP: | |
1508 | return "FCP"; | |
1509 | case SCSI_PROTOCOL_ISCSI: | |
1510 | return "iSCSI"; | |
1511 | default: | |
1512 | break; | |
1513 | } | |
1514 | ||
1515 | return "Unknown"; | |
1516 | } | |
1517 | ||
a6c9af87 AH |
1518 | static void tcm_vhost_do_plug(struct tcm_vhost_tpg *tpg, |
1519 | struct se_lun *lun, bool plug) | |
1520 | { | |
1521 | ||
1522 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1523 | struct vhost_virtqueue *vq; | |
1524 | u32 reason; | |
1525 | ||
1526 | if (!vs) | |
1527 | return; | |
1528 | ||
1529 | mutex_lock(&vs->dev.mutex); | |
1530 | if (!vhost_has_feature(&vs->dev, VIRTIO_SCSI_F_HOTPLUG)) { | |
1531 | mutex_unlock(&vs->dev.mutex); | |
1532 | return; | |
1533 | } | |
1534 | ||
1535 | if (plug) | |
1536 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1537 | else | |
1538 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1539 | ||
3ab2e420 | 1540 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
1541 | mutex_lock(&vq->mutex); |
1542 | tcm_vhost_send_evt(vs, tpg, lun, | |
1543 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); | |
1544 | mutex_unlock(&vq->mutex); | |
1545 | mutex_unlock(&vs->dev.mutex); | |
1546 | } | |
1547 | ||
1548 | static void tcm_vhost_hotplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun) | |
1549 | { | |
1550 | tcm_vhost_do_plug(tpg, lun, true); | |
1551 | } | |
1552 | ||
1553 | static void tcm_vhost_hotunplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun) | |
1554 | { | |
1555 | tcm_vhost_do_plug(tpg, lun, false); | |
1556 | } | |
1557 | ||
101998f6 | 1558 | static int tcm_vhost_port_link(struct se_portal_group *se_tpg, |
057cbf49 NB |
1559 | struct se_lun *lun) |
1560 | { | |
1561 | struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg, | |
1562 | struct tcm_vhost_tpg, se_tpg); | |
1563 | ||
a6c9af87 AH |
1564 | mutex_lock(&tcm_vhost_mutex); |
1565 | ||
101998f6 NB |
1566 | mutex_lock(&tv_tpg->tv_tpg_mutex); |
1567 | tv_tpg->tv_tpg_port_count++; | |
1568 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
057cbf49 | 1569 | |
a6c9af87 AH |
1570 | tcm_vhost_hotplug(tv_tpg, lun); |
1571 | ||
1572 | mutex_unlock(&tcm_vhost_mutex); | |
1573 | ||
057cbf49 NB |
1574 | return 0; |
1575 | } | |
1576 | ||
101998f6 | 1577 | static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg, |
a6c9af87 | 1578 | struct se_lun *lun) |
057cbf49 NB |
1579 | { |
1580 | struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg, | |
1581 | struct tcm_vhost_tpg, se_tpg); | |
1582 | ||
a6c9af87 AH |
1583 | mutex_lock(&tcm_vhost_mutex); |
1584 | ||
101998f6 NB |
1585 | mutex_lock(&tv_tpg->tv_tpg_mutex); |
1586 | tv_tpg->tv_tpg_port_count--; | |
1587 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
a6c9af87 AH |
1588 | |
1589 | tcm_vhost_hotunplug(tv_tpg, lun); | |
1590 | ||
1591 | mutex_unlock(&tcm_vhost_mutex); | |
057cbf49 NB |
1592 | } |
1593 | ||
1594 | static struct se_node_acl *tcm_vhost_make_nodeacl( | |
1595 | struct se_portal_group *se_tpg, | |
1596 | struct config_group *group, | |
1597 | const char *name) | |
1598 | { | |
1599 | struct se_node_acl *se_nacl, *se_nacl_new; | |
1600 | struct tcm_vhost_nacl *nacl; | |
1601 | u64 wwpn = 0; | |
1602 | u32 nexus_depth; | |
1603 | ||
1604 | /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0) | |
1605 | return ERR_PTR(-EINVAL); */ | |
1606 | se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg); | |
1607 | if (!se_nacl_new) | |
1608 | return ERR_PTR(-ENOMEM); | |
1609 | ||
1610 | nexus_depth = 1; | |
1611 | /* | |
1612 | * se_nacl_new may be released by core_tpg_add_initiator_node_acl() | |
1613 | * when converting a NodeACL from demo mode -> explict | |
1614 | */ | |
1615 | se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new, | |
1616 | name, nexus_depth); | |
1617 | if (IS_ERR(se_nacl)) { | |
1618 | tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new); | |
1619 | return se_nacl; | |
1620 | } | |
1621 | /* | |
1622 | * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN | |
1623 | */ | |
1624 | nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl); | |
1625 | nacl->iport_wwpn = wwpn; | |
1626 | ||
1627 | return se_nacl; | |
1628 | } | |
1629 | ||
1630 | static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl) | |
1631 | { | |
1632 | struct tcm_vhost_nacl *nacl = container_of(se_acl, | |
1633 | struct tcm_vhost_nacl, se_node_acl); | |
1634 | core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1); | |
1635 | kfree(nacl); | |
1636 | } | |
1637 | ||
101998f6 | 1638 | static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tv_tpg, |
057cbf49 NB |
1639 | const char *name) |
1640 | { | |
1641 | struct se_portal_group *se_tpg; | |
1642 | struct tcm_vhost_nexus *tv_nexus; | |
1643 | ||
1644 | mutex_lock(&tv_tpg->tv_tpg_mutex); | |
1645 | if (tv_tpg->tpg_nexus) { | |
1646 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1647 | pr_debug("tv_tpg->tpg_nexus already exists\n"); | |
1648 | return -EEXIST; | |
1649 | } | |
1650 | se_tpg = &tv_tpg->se_tpg; | |
1651 | ||
1652 | tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL); | |
1653 | if (!tv_nexus) { | |
1654 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1655 | pr_err("Unable to allocate struct tcm_vhost_nexus\n"); | |
1656 | return -ENOMEM; | |
1657 | } | |
1658 | /* | |
1659 | * Initialize the struct se_session pointer | |
1660 | */ | |
1661 | tv_nexus->tvn_se_sess = transport_init_session(); | |
1662 | if (IS_ERR(tv_nexus->tvn_se_sess)) { | |
1663 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1664 | kfree(tv_nexus); | |
1665 | return -ENOMEM; | |
1666 | } | |
1667 | /* | |
1668 | * Since we are running in 'demo mode' this call with generate a | |
1669 | * struct se_node_acl for the tcm_vhost struct se_portal_group with | |
1670 | * the SCSI Initiator port name of the passed configfs group 'name'. | |
1671 | */ | |
1672 | tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
1673 | se_tpg, (unsigned char *)name); | |
1674 | if (!tv_nexus->tvn_se_sess->se_node_acl) { | |
1675 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1676 | pr_debug("core_tpg_check_initiator_node_acl() failed" | |
1677 | " for %s\n", name); | |
1678 | transport_free_session(tv_nexus->tvn_se_sess); | |
1679 | kfree(tv_nexus); | |
1680 | return -ENOMEM; | |
1681 | } | |
1682 | /* | |
101998f6 | 1683 | * Now register the TCM vhost virtual I_T Nexus as active with the |
057cbf49 NB |
1684 | * call to __transport_register_session() |
1685 | */ | |
1686 | __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl, | |
1687 | tv_nexus->tvn_se_sess, tv_nexus); | |
1688 | tv_tpg->tpg_nexus = tv_nexus; | |
1689 | ||
1690 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1691 | return 0; | |
1692 | } | |
1693 | ||
101998f6 | 1694 | static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg *tpg) |
057cbf49 NB |
1695 | { |
1696 | struct se_session *se_sess; | |
1697 | struct tcm_vhost_nexus *tv_nexus; | |
1698 | ||
1699 | mutex_lock(&tpg->tv_tpg_mutex); | |
1700 | tv_nexus = tpg->tpg_nexus; | |
1701 | if (!tv_nexus) { | |
1702 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1703 | return -ENODEV; | |
1704 | } | |
1705 | ||
1706 | se_sess = tv_nexus->tvn_se_sess; | |
1707 | if (!se_sess) { | |
1708 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1709 | return -ENODEV; | |
1710 | } | |
1711 | ||
101998f6 | 1712 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 1713 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1714 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1715 | " active TPG port count: %d\n", |
101998f6 NB |
1716 | tpg->tv_tpg_port_count); |
1717 | return -EBUSY; | |
057cbf49 NB |
1718 | } |
1719 | ||
101998f6 | 1720 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 1721 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1722 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1723 | " active TPG vhost count: %d\n", |
101998f6 NB |
1724 | tpg->tv_tpg_vhost_count); |
1725 | return -EBUSY; | |
057cbf49 NB |
1726 | } |
1727 | ||
101998f6 | 1728 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
057cbf49 NB |
1729 | " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport), |
1730 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
1731 | /* | |
101998f6 | 1732 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 NB |
1733 | */ |
1734 | transport_deregister_session(tv_nexus->tvn_se_sess); | |
1735 | tpg->tpg_nexus = NULL; | |
1736 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1737 | ||
1738 | kfree(tv_nexus); | |
1739 | return 0; | |
1740 | } | |
1741 | ||
101998f6 | 1742 | static ssize_t tcm_vhost_tpg_show_nexus(struct se_portal_group *se_tpg, |
057cbf49 NB |
1743 | char *page) |
1744 | { | |
1745 | struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg, | |
1746 | struct tcm_vhost_tpg, se_tpg); | |
1747 | struct tcm_vhost_nexus *tv_nexus; | |
1748 | ssize_t ret; | |
1749 | ||
1750 | mutex_lock(&tv_tpg->tv_tpg_mutex); | |
1751 | tv_nexus = tv_tpg->tpg_nexus; | |
1752 | if (!tv_nexus) { | |
1753 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1754 | return -ENODEV; | |
1755 | } | |
1756 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1757 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
1758 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1759 | ||
1760 | return ret; | |
1761 | } | |
1762 | ||
101998f6 | 1763 | static ssize_t tcm_vhost_tpg_store_nexus(struct se_portal_group *se_tpg, |
057cbf49 NB |
1764 | const char *page, |
1765 | size_t count) | |
1766 | { | |
1767 | struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg, | |
1768 | struct tcm_vhost_tpg, se_tpg); | |
1769 | struct tcm_vhost_tport *tport_wwn = tv_tpg->tport; | |
1770 | unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr; | |
1771 | int ret; | |
1772 | /* | |
1773 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
1774 | */ | |
1775 | if (!strncmp(page, "NULL", 4)) { | |
1776 | ret = tcm_vhost_drop_nexus(tv_tpg); | |
1777 | return (!ret) ? count : ret; | |
1778 | } | |
1779 | /* | |
1780 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1781 | * the fabric protocol_id set in tcm_vhost_make_tport(), and call | |
1782 | * tcm_vhost_make_nexus(). | |
1783 | */ | |
1784 | if (strlen(page) >= TCM_VHOST_NAMELEN) { | |
1785 | pr_err("Emulated NAA Sas Address: %s, exceeds" | |
1786 | " max: %d\n", page, TCM_VHOST_NAMELEN); | |
1787 | return -EINVAL; | |
1788 | } | |
1789 | snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page); | |
1790 | ||
1791 | ptr = strstr(i_port, "naa."); | |
1792 | if (ptr) { | |
1793 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
1794 | pr_err("Passed SAS Initiator Port %s does not" | |
1795 | " match target port protoid: %s\n", i_port, | |
1796 | tcm_vhost_dump_proto_id(tport_wwn)); | |
1797 | return -EINVAL; | |
1798 | } | |
1799 | port_ptr = &i_port[0]; | |
1800 | goto check_newline; | |
1801 | } | |
1802 | ptr = strstr(i_port, "fc."); | |
1803 | if (ptr) { | |
1804 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
1805 | pr_err("Passed FCP Initiator Port %s does not" | |
1806 | " match target port protoid: %s\n", i_port, | |
1807 | tcm_vhost_dump_proto_id(tport_wwn)); | |
1808 | return -EINVAL; | |
1809 | } | |
1810 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1811 | goto check_newline; | |
1812 | } | |
1813 | ptr = strstr(i_port, "iqn."); | |
1814 | if (ptr) { | |
1815 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
1816 | pr_err("Passed iSCSI Initiator Port %s does not" | |
1817 | " match target port protoid: %s\n", i_port, | |
1818 | tcm_vhost_dump_proto_id(tport_wwn)); | |
1819 | return -EINVAL; | |
1820 | } | |
1821 | port_ptr = &i_port[0]; | |
1822 | goto check_newline; | |
1823 | } | |
1824 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
1825 | " %s\n", i_port); | |
1826 | return -EINVAL; | |
1827 | /* | |
1828 | * Clear any trailing newline for the NAA WWN | |
1829 | */ | |
1830 | check_newline: | |
1831 | if (i_port[strlen(i_port)-1] == '\n') | |
1832 | i_port[strlen(i_port)-1] = '\0'; | |
1833 | ||
1834 | ret = tcm_vhost_make_nexus(tv_tpg, port_ptr); | |
1835 | if (ret < 0) | |
1836 | return ret; | |
1837 | ||
1838 | return count; | |
1839 | } | |
1840 | ||
1841 | TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR); | |
1842 | ||
1843 | static struct configfs_attribute *tcm_vhost_tpg_attrs[] = { | |
1844 | &tcm_vhost_tpg_nexus.attr, | |
1845 | NULL, | |
1846 | }; | |
1847 | ||
101998f6 | 1848 | static struct se_portal_group *tcm_vhost_make_tpg(struct se_wwn *wwn, |
057cbf49 NB |
1849 | struct config_group *group, |
1850 | const char *name) | |
1851 | { | |
1852 | struct tcm_vhost_tport *tport = container_of(wwn, | |
1853 | struct tcm_vhost_tport, tport_wwn); | |
1854 | ||
1855 | struct tcm_vhost_tpg *tpg; | |
1856 | unsigned long tpgt; | |
1857 | int ret; | |
1858 | ||
1859 | if (strstr(name, "tpgt_") != name) | |
1860 | return ERR_PTR(-EINVAL); | |
1861 | if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX) | |
1862 | return ERR_PTR(-EINVAL); | |
1863 | ||
1864 | tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL); | |
1865 | if (!tpg) { | |
1866 | pr_err("Unable to allocate struct tcm_vhost_tpg"); | |
1867 | return ERR_PTR(-ENOMEM); | |
1868 | } | |
1869 | mutex_init(&tpg->tv_tpg_mutex); | |
1870 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
1871 | tpg->tport = tport; | |
1872 | tpg->tport_tpgt = tpgt; | |
1873 | ||
1874 | ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn, | |
1875 | &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL); | |
1876 | if (ret < 0) { | |
1877 | kfree(tpg); | |
1878 | return NULL; | |
1879 | } | |
1880 | mutex_lock(&tcm_vhost_mutex); | |
1881 | list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list); | |
1882 | mutex_unlock(&tcm_vhost_mutex); | |
1883 | ||
1884 | return &tpg->se_tpg; | |
1885 | } | |
1886 | ||
1887 | static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg) | |
1888 | { | |
1889 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
1890 | struct tcm_vhost_tpg, se_tpg); | |
1891 | ||
1892 | mutex_lock(&tcm_vhost_mutex); | |
1893 | list_del(&tpg->tv_tpg_list); | |
1894 | mutex_unlock(&tcm_vhost_mutex); | |
1895 | /* | |
101998f6 | 1896 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 NB |
1897 | */ |
1898 | tcm_vhost_drop_nexus(tpg); | |
1899 | /* | |
1900 | * Deregister the se_tpg from TCM.. | |
1901 | */ | |
1902 | core_tpg_deregister(se_tpg); | |
1903 | kfree(tpg); | |
1904 | } | |
1905 | ||
101998f6 | 1906 | static struct se_wwn *tcm_vhost_make_tport(struct target_fabric_configfs *tf, |
057cbf49 NB |
1907 | struct config_group *group, |
1908 | const char *name) | |
1909 | { | |
1910 | struct tcm_vhost_tport *tport; | |
1911 | char *ptr; | |
1912 | u64 wwpn = 0; | |
1913 | int off = 0; | |
1914 | ||
1915 | /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0) | |
1916 | return ERR_PTR(-EINVAL); */ | |
1917 | ||
1918 | tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL); | |
1919 | if (!tport) { | |
1920 | pr_err("Unable to allocate struct tcm_vhost_tport"); | |
1921 | return ERR_PTR(-ENOMEM); | |
1922 | } | |
1923 | tport->tport_wwpn = wwpn; | |
1924 | /* | |
1925 | * Determine the emulated Protocol Identifier and Target Port Name | |
1926 | * based on the incoming configfs directory name. | |
1927 | */ | |
1928 | ptr = strstr(name, "naa."); | |
1929 | if (ptr) { | |
1930 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
1931 | goto check_len; | |
1932 | } | |
1933 | ptr = strstr(name, "fc."); | |
1934 | if (ptr) { | |
1935 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
1936 | off = 3; /* Skip over "fc." */ | |
1937 | goto check_len; | |
1938 | } | |
1939 | ptr = strstr(name, "iqn."); | |
1940 | if (ptr) { | |
1941 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
1942 | goto check_len; | |
1943 | } | |
1944 | ||
1945 | pr_err("Unable to locate prefix for emulated Target Port:" | |
1946 | " %s\n", name); | |
1947 | kfree(tport); | |
1948 | return ERR_PTR(-EINVAL); | |
1949 | ||
1950 | check_len: | |
1951 | if (strlen(name) >= TCM_VHOST_NAMELEN) { | |
1952 | pr_err("Emulated %s Address: %s, exceeds" | |
1953 | " max: %d\n", name, tcm_vhost_dump_proto_id(tport), | |
1954 | TCM_VHOST_NAMELEN); | |
1955 | kfree(tport); | |
1956 | return ERR_PTR(-EINVAL); | |
1957 | } | |
1958 | snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]); | |
1959 | ||
1960 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
1961 | " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name); | |
1962 | ||
1963 | return &tport->tport_wwn; | |
1964 | } | |
1965 | ||
1966 | static void tcm_vhost_drop_tport(struct se_wwn *wwn) | |
1967 | { | |
1968 | struct tcm_vhost_tport *tport = container_of(wwn, | |
1969 | struct tcm_vhost_tport, tport_wwn); | |
1970 | ||
1971 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
1972 | " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), | |
1973 | tport->tport_name); | |
1974 | ||
1975 | kfree(tport); | |
1976 | } | |
1977 | ||
1978 | static ssize_t tcm_vhost_wwn_show_attr_version( | |
1979 | struct target_fabric_configfs *tf, | |
1980 | char *page) | |
1981 | { | |
1982 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" | |
1983 | "on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname, | |
1984 | utsname()->machine); | |
1985 | } | |
1986 | ||
1987 | TF_WWN_ATTR_RO(tcm_vhost, version); | |
1988 | ||
1989 | static struct configfs_attribute *tcm_vhost_wwn_attrs[] = { | |
1990 | &tcm_vhost_wwn_version.attr, | |
1991 | NULL, | |
1992 | }; | |
1993 | ||
1994 | static struct target_core_fabric_ops tcm_vhost_ops = { | |
1995 | .get_fabric_name = tcm_vhost_get_fabric_name, | |
1996 | .get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident, | |
1997 | .tpg_get_wwn = tcm_vhost_get_fabric_wwn, | |
1998 | .tpg_get_tag = tcm_vhost_get_tag, | |
1999 | .tpg_get_default_depth = tcm_vhost_get_default_depth, | |
2000 | .tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id, | |
2001 | .tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len, | |
2002 | .tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id, | |
2003 | .tpg_check_demo_mode = tcm_vhost_check_true, | |
2004 | .tpg_check_demo_mode_cache = tcm_vhost_check_true, | |
2005 | .tpg_check_demo_mode_write_protect = tcm_vhost_check_false, | |
2006 | .tpg_check_prod_mode_write_protect = tcm_vhost_check_false, | |
2007 | .tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl, | |
2008 | .tpg_release_fabric_acl = tcm_vhost_release_fabric_acl, | |
2009 | .tpg_get_inst_index = tcm_vhost_tpg_get_inst_index, | |
2010 | .release_cmd = tcm_vhost_release_cmd, | |
2011 | .shutdown_session = tcm_vhost_shutdown_session, | |
2012 | .close_session = tcm_vhost_close_session, | |
2013 | .sess_get_index = tcm_vhost_sess_get_index, | |
2014 | .sess_get_initiator_sid = NULL, | |
2015 | .write_pending = tcm_vhost_write_pending, | |
2016 | .write_pending_status = tcm_vhost_write_pending_status, | |
2017 | .set_default_node_attributes = tcm_vhost_set_default_node_attrs, | |
2018 | .get_task_tag = tcm_vhost_get_task_tag, | |
2019 | .get_cmd_state = tcm_vhost_get_cmd_state, | |
2020 | .queue_data_in = tcm_vhost_queue_data_in, | |
2021 | .queue_status = tcm_vhost_queue_status, | |
2022 | .queue_tm_rsp = tcm_vhost_queue_tm_rsp, | |
057cbf49 NB |
2023 | /* |
2024 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
2025 | */ | |
2026 | .fabric_make_wwn = tcm_vhost_make_tport, | |
2027 | .fabric_drop_wwn = tcm_vhost_drop_tport, | |
2028 | .fabric_make_tpg = tcm_vhost_make_tpg, | |
2029 | .fabric_drop_tpg = tcm_vhost_drop_tpg, | |
2030 | .fabric_post_link = tcm_vhost_port_link, | |
2031 | .fabric_pre_unlink = tcm_vhost_port_unlink, | |
2032 | .fabric_make_np = NULL, | |
2033 | .fabric_drop_np = NULL, | |
2034 | .fabric_make_nodeacl = tcm_vhost_make_nodeacl, | |
2035 | .fabric_drop_nodeacl = tcm_vhost_drop_nodeacl, | |
2036 | }; | |
2037 | ||
2038 | static int tcm_vhost_register_configfs(void) | |
2039 | { | |
2040 | struct target_fabric_configfs *fabric; | |
2041 | int ret; | |
2042 | ||
2043 | pr_debug("TCM_VHOST fabric module %s on %s/%s" | |
2044 | " on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname, | |
2045 | utsname()->machine); | |
2046 | /* | |
2047 | * Register the top level struct config_item_type with TCM core | |
2048 | */ | |
2049 | fabric = target_fabric_configfs_init(THIS_MODULE, "vhost"); | |
2050 | if (IS_ERR(fabric)) { | |
2051 | pr_err("target_fabric_configfs_init() failed\n"); | |
2052 | return PTR_ERR(fabric); | |
2053 | } | |
2054 | /* | |
2055 | * Setup fabric->tf_ops from our local tcm_vhost_ops | |
2056 | */ | |
2057 | fabric->tf_ops = tcm_vhost_ops; | |
2058 | /* | |
2059 | * Setup default attribute lists for various fabric->tf_cit_tmpl | |
2060 | */ | |
2061 | TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs; | |
2062 | TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs; | |
2063 | TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL; | |
2064 | TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL; | |
2065 | TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL; | |
2066 | TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL; | |
2067 | TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL; | |
2068 | TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL; | |
2069 | TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL; | |
2070 | /* | |
2071 | * Register the fabric for use within TCM | |
2072 | */ | |
2073 | ret = target_fabric_configfs_register(fabric); | |
2074 | if (ret < 0) { | |
2075 | pr_err("target_fabric_configfs_register() failed" | |
2076 | " for TCM_VHOST\n"); | |
2077 | return ret; | |
2078 | } | |
2079 | /* | |
2080 | * Setup our local pointer to *fabric | |
2081 | */ | |
2082 | tcm_vhost_fabric_configfs = fabric; | |
2083 | pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n"); | |
2084 | return 0; | |
2085 | }; | |
2086 | ||
2087 | static void tcm_vhost_deregister_configfs(void) | |
2088 | { | |
2089 | if (!tcm_vhost_fabric_configfs) | |
2090 | return; | |
2091 | ||
2092 | target_fabric_configfs_deregister(tcm_vhost_fabric_configfs); | |
2093 | tcm_vhost_fabric_configfs = NULL; | |
2094 | pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n"); | |
2095 | }; | |
2096 | ||
2097 | static int __init tcm_vhost_init(void) | |
2098 | { | |
2099 | int ret = -ENOMEM; | |
101998f6 NB |
2100 | /* |
2101 | * Use our own dedicated workqueue for submitting I/O into | |
2102 | * target core to avoid contention within system_wq. | |
2103 | */ | |
057cbf49 NB |
2104 | tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0); |
2105 | if (!tcm_vhost_workqueue) | |
2106 | goto out; | |
2107 | ||
2108 | ret = vhost_scsi_register(); | |
2109 | if (ret < 0) | |
2110 | goto out_destroy_workqueue; | |
2111 | ||
2112 | ret = tcm_vhost_register_configfs(); | |
2113 | if (ret < 0) | |
2114 | goto out_vhost_scsi_deregister; | |
2115 | ||
2116 | return 0; | |
2117 | ||
2118 | out_vhost_scsi_deregister: | |
2119 | vhost_scsi_deregister(); | |
2120 | out_destroy_workqueue: | |
2121 | destroy_workqueue(tcm_vhost_workqueue); | |
2122 | out: | |
2123 | return ret; | |
2124 | }; | |
2125 | ||
2126 | static void tcm_vhost_exit(void) | |
2127 | { | |
2128 | tcm_vhost_deregister_configfs(); | |
2129 | vhost_scsi_deregister(); | |
2130 | destroy_workqueue(tcm_vhost_workqueue); | |
2131 | }; | |
2132 | ||
181c04a3 MT |
2133 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
2134 | MODULE_ALIAS("tcm_vhost"); | |
057cbf49 NB |
2135 | MODULE_LICENSE("GPL"); |
2136 | module_init(tcm_vhost_init); | |
2137 | module_exit(tcm_vhost_exit); |