Commit | Line | Data |
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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> | |
48 | #include <linux/virtio_net.h> /* TODO vhost.h currently depends on this */ | |
49 | #include <linux/virtio_scsi.h> | |
9d6064a3 | 50 | #include <linux/llist.h> |
1b7f390e | 51 | #include <linux/bitmap.h> |
057cbf49 NB |
52 | |
53 | #include "vhost.c" | |
54 | #include "vhost.h" | |
55 | #include "tcm_vhost.h" | |
56 | ||
101998f6 NB |
57 | enum { |
58 | VHOST_SCSI_VQ_CTL = 0, | |
59 | VHOST_SCSI_VQ_EVT = 1, | |
60 | VHOST_SCSI_VQ_IO = 2, | |
61 | }; | |
62 | ||
5dade710 NB |
63 | /* |
64 | * VIRTIO_RING_F_EVENT_IDX seems broken. Not sure the bug is in | |
65 | * kernel but disabling it helps. | |
66 | * TODO: debug and remove the workaround. | |
67 | */ | |
68 | enum { | |
04b59bab AH |
69 | VHOST_SCSI_FEATURES = (VHOST_FEATURES & (~VIRTIO_RING_F_EVENT_IDX)) | |
70 | (1ULL << VIRTIO_SCSI_F_HOTPLUG) | |
5dade710 NB |
71 | }; |
72 | ||
1b7f390e AH |
73 | #define VHOST_SCSI_MAX_TARGET 256 |
74 | #define VHOST_SCSI_MAX_VQ 128 | |
a6c9af87 | 75 | #define VHOST_SCSI_MAX_EVENT 128 |
67e18cf9 | 76 | |
3ab2e420 AH |
77 | struct vhost_scsi_virtqueue { |
78 | struct vhost_virtqueue vq; | |
79 | }; | |
80 | ||
057cbf49 | 81 | struct vhost_scsi { |
67e18cf9 | 82 | /* Protected by vhost_scsi->dev.mutex */ |
4f7f46d3 | 83 | struct tcm_vhost_tpg **vs_tpg; |
67e18cf9 | 84 | char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
67e18cf9 | 85 | |
057cbf49 | 86 | struct vhost_dev dev; |
3ab2e420 | 87 | struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ]; |
057cbf49 NB |
88 | |
89 | struct vhost_work vs_completion_work; /* cmd completion work item */ | |
9d6064a3 | 90 | struct llist_head vs_completion_list; /* cmd completion queue */ |
a6c9af87 AH |
91 | |
92 | struct vhost_work vs_event_work; /* evt injection work item */ | |
93 | struct llist_head vs_event_list; /* evt injection queue */ | |
94 | ||
95 | bool vs_events_missed; /* any missed events, protected by vq->mutex */ | |
96 | int vs_events_nr; /* num of pending events, protected by vq->mutex */ | |
057cbf49 NB |
97 | }; |
98 | ||
99 | /* Local pointer to allocated TCM configfs fabric module */ | |
100 | static struct target_fabric_configfs *tcm_vhost_fabric_configfs; | |
101 | ||
102 | static struct workqueue_struct *tcm_vhost_workqueue; | |
103 | ||
104 | /* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */ | |
105 | static DEFINE_MUTEX(tcm_vhost_mutex); | |
106 | static LIST_HEAD(tcm_vhost_list); | |
107 | ||
765b34fd AH |
108 | static int iov_num_pages(struct iovec *iov) |
109 | { | |
110 | return (PAGE_ALIGN((unsigned long)iov->iov_base + iov->iov_len) - | |
111 | ((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT; | |
112 | } | |
113 | ||
057cbf49 NB |
114 | static int tcm_vhost_check_true(struct se_portal_group *se_tpg) |
115 | { | |
116 | return 1; | |
117 | } | |
118 | ||
119 | static int tcm_vhost_check_false(struct se_portal_group *se_tpg) | |
120 | { | |
121 | return 0; | |
122 | } | |
123 | ||
124 | static char *tcm_vhost_get_fabric_name(void) | |
125 | { | |
126 | return "vhost"; | |
127 | } | |
128 | ||
129 | static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg) | |
130 | { | |
131 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
132 | struct tcm_vhost_tpg, se_tpg); | |
133 | struct tcm_vhost_tport *tport = tpg->tport; | |
134 | ||
135 | switch (tport->tport_proto_id) { | |
136 | case SCSI_PROTOCOL_SAS: | |
137 | return sas_get_fabric_proto_ident(se_tpg); | |
138 | case SCSI_PROTOCOL_FCP: | |
139 | return fc_get_fabric_proto_ident(se_tpg); | |
140 | case SCSI_PROTOCOL_ISCSI: | |
141 | return iscsi_get_fabric_proto_ident(se_tpg); | |
142 | default: | |
143 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
144 | " SAS emulation\n", tport->tport_proto_id); | |
145 | break; | |
146 | } | |
147 | ||
148 | return sas_get_fabric_proto_ident(se_tpg); | |
149 | } | |
150 | ||
151 | static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg) | |
152 | { | |
153 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
154 | struct tcm_vhost_tpg, se_tpg); | |
155 | struct tcm_vhost_tport *tport = tpg->tport; | |
156 | ||
157 | return &tport->tport_name[0]; | |
158 | } | |
159 | ||
160 | static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg) | |
161 | { | |
162 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
163 | struct tcm_vhost_tpg, se_tpg); | |
164 | return tpg->tport_tpgt; | |
165 | } | |
166 | ||
167 | static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg) | |
168 | { | |
169 | return 1; | |
170 | } | |
171 | ||
101998f6 | 172 | static u32 tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg, |
057cbf49 NB |
173 | struct se_node_acl *se_nacl, |
174 | struct t10_pr_registration *pr_reg, | |
175 | int *format_code, | |
176 | unsigned char *buf) | |
177 | { | |
178 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
179 | struct tcm_vhost_tpg, se_tpg); | |
180 | struct tcm_vhost_tport *tport = tpg->tport; | |
181 | ||
182 | switch (tport->tport_proto_id) { | |
183 | case SCSI_PROTOCOL_SAS: | |
184 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
185 | format_code, buf); | |
186 | case SCSI_PROTOCOL_FCP: | |
187 | return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
188 | format_code, buf); | |
189 | case SCSI_PROTOCOL_ISCSI: | |
190 | return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
191 | format_code, buf); | |
192 | default: | |
193 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
194 | " SAS emulation\n", tport->tport_proto_id); | |
195 | break; | |
196 | } | |
197 | ||
198 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
199 | format_code, buf); | |
200 | } | |
201 | ||
101998f6 | 202 | static u32 tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg, |
057cbf49 NB |
203 | struct se_node_acl *se_nacl, |
204 | struct t10_pr_registration *pr_reg, | |
205 | int *format_code) | |
206 | { | |
207 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
208 | struct tcm_vhost_tpg, se_tpg); | |
209 | struct tcm_vhost_tport *tport = tpg->tport; | |
210 | ||
211 | switch (tport->tport_proto_id) { | |
212 | case SCSI_PROTOCOL_SAS: | |
213 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
214 | format_code); | |
215 | case SCSI_PROTOCOL_FCP: | |
216 | return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
217 | format_code); | |
218 | case SCSI_PROTOCOL_ISCSI: | |
219 | return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
220 | format_code); | |
221 | default: | |
222 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
223 | " SAS emulation\n", tport->tport_proto_id); | |
224 | break; | |
225 | } | |
226 | ||
227 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
228 | format_code); | |
229 | } | |
230 | ||
101998f6 | 231 | static char *tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg, |
057cbf49 NB |
232 | const char *buf, |
233 | u32 *out_tid_len, | |
234 | char **port_nexus_ptr) | |
235 | { | |
236 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
237 | struct tcm_vhost_tpg, se_tpg); | |
238 | struct tcm_vhost_tport *tport = tpg->tport; | |
239 | ||
240 | switch (tport->tport_proto_id) { | |
241 | case SCSI_PROTOCOL_SAS: | |
242 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
243 | port_nexus_ptr); | |
244 | case SCSI_PROTOCOL_FCP: | |
245 | return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
246 | port_nexus_ptr); | |
247 | case SCSI_PROTOCOL_ISCSI: | |
248 | return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
249 | port_nexus_ptr); | |
250 | default: | |
251 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
252 | " SAS emulation\n", tport->tport_proto_id); | |
253 | break; | |
254 | } | |
255 | ||
256 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
257 | port_nexus_ptr); | |
258 | } | |
259 | ||
260 | static struct se_node_acl *tcm_vhost_alloc_fabric_acl( | |
261 | struct se_portal_group *se_tpg) | |
262 | { | |
263 | struct tcm_vhost_nacl *nacl; | |
264 | ||
265 | nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL); | |
266 | if (!nacl) { | |
744627e9 | 267 | pr_err("Unable to allocate struct tcm_vhost_nacl\n"); |
057cbf49 NB |
268 | return NULL; |
269 | } | |
270 | ||
271 | return &nacl->se_node_acl; | |
272 | } | |
273 | ||
101998f6 | 274 | static void tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg, |
057cbf49 NB |
275 | struct se_node_acl *se_nacl) |
276 | { | |
277 | struct tcm_vhost_nacl *nacl = container_of(se_nacl, | |
278 | struct tcm_vhost_nacl, se_node_acl); | |
279 | kfree(nacl); | |
280 | } | |
281 | ||
282 | static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg) | |
283 | { | |
284 | return 1; | |
285 | } | |
286 | ||
287 | static void tcm_vhost_release_cmd(struct se_cmd *se_cmd) | |
288 | { | |
289 | return; | |
290 | } | |
291 | ||
292 | static int tcm_vhost_shutdown_session(struct se_session *se_sess) | |
293 | { | |
294 | return 0; | |
295 | } | |
296 | ||
297 | static void tcm_vhost_close_session(struct se_session *se_sess) | |
298 | { | |
299 | return; | |
300 | } | |
301 | ||
302 | static u32 tcm_vhost_sess_get_index(struct se_session *se_sess) | |
303 | { | |
304 | return 0; | |
305 | } | |
306 | ||
307 | static int tcm_vhost_write_pending(struct se_cmd *se_cmd) | |
308 | { | |
309 | /* Go ahead and process the write immediately */ | |
310 | target_execute_cmd(se_cmd); | |
311 | return 0; | |
312 | } | |
313 | ||
314 | static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd) | |
315 | { | |
316 | return 0; | |
317 | } | |
318 | ||
319 | static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl) | |
320 | { | |
321 | return; | |
322 | } | |
323 | ||
324 | static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd) | |
325 | { | |
326 | return 0; | |
327 | } | |
328 | ||
329 | static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd) | |
330 | { | |
331 | return 0; | |
332 | } | |
333 | ||
101998f6 NB |
334 | static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *tv_cmd) |
335 | { | |
336 | struct vhost_scsi *vs = tv_cmd->tvc_vhost; | |
337 | ||
9d6064a3 | 338 | llist_add(&tv_cmd->tvc_completion_list, &vs->vs_completion_list); |
101998f6 NB |
339 | |
340 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
341 | } | |
057cbf49 NB |
342 | |
343 | static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd) | |
344 | { | |
345 | struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd, | |
346 | struct tcm_vhost_cmd, tvc_se_cmd); | |
347 | vhost_scsi_complete_cmd(tv_cmd); | |
348 | return 0; | |
349 | } | |
350 | ||
351 | static int tcm_vhost_queue_status(struct se_cmd *se_cmd) | |
352 | { | |
353 | struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd, | |
354 | struct tcm_vhost_cmd, tvc_se_cmd); | |
355 | vhost_scsi_complete_cmd(tv_cmd); | |
356 | return 0; | |
357 | } | |
358 | ||
359 | static int tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd) | |
360 | { | |
361 | return 0; | |
362 | } | |
363 | ||
a6c9af87 AH |
364 | static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt) |
365 | { | |
366 | vs->vs_events_nr--; | |
367 | kfree(evt); | |
368 | } | |
369 | ||
370 | static struct tcm_vhost_evt *tcm_vhost_allocate_evt(struct vhost_scsi *vs, | |
371 | u32 event, u32 reason) | |
372 | { | |
3ab2e420 | 373 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
374 | struct tcm_vhost_evt *evt; |
375 | ||
376 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
377 | vs->vs_events_missed = true; | |
378 | return NULL; | |
379 | } | |
380 | ||
381 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
382 | if (!evt) { | |
383 | vq_err(vq, "Failed to allocate tcm_vhost_evt\n"); | |
384 | vs->vs_events_missed = true; | |
385 | return NULL; | |
386 | } | |
387 | ||
388 | evt->event.event = event; | |
389 | evt->event.reason = reason; | |
390 | vs->vs_events_nr++; | |
391 | ||
392 | return evt; | |
393 | } | |
394 | ||
057cbf49 NB |
395 | static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd) |
396 | { | |
397 | struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd; | |
398 | ||
399 | /* TODO locking against target/backend threads? */ | |
400 | transport_generic_free_cmd(se_cmd, 1); | |
401 | ||
402 | if (tv_cmd->tvc_sgl_count) { | |
403 | u32 i; | |
404 | for (i = 0; i < tv_cmd->tvc_sgl_count; i++) | |
405 | put_page(sg_page(&tv_cmd->tvc_sgl[i])); | |
406 | ||
407 | kfree(tv_cmd->tvc_sgl); | |
408 | } | |
409 | ||
410 | kfree(tv_cmd); | |
411 | } | |
412 | ||
a6c9af87 AH |
413 | static void tcm_vhost_do_evt_work(struct vhost_scsi *vs, |
414 | struct tcm_vhost_evt *evt) | |
415 | { | |
3ab2e420 | 416 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
417 | struct virtio_scsi_event *event = &evt->event; |
418 | struct virtio_scsi_event __user *eventp; | |
419 | unsigned out, in; | |
420 | int head, ret; | |
421 | ||
422 | if (!vq->private_data) { | |
423 | vs->vs_events_missed = true; | |
424 | return; | |
425 | } | |
426 | ||
427 | again: | |
428 | vhost_disable_notify(&vs->dev, vq); | |
429 | head = vhost_get_vq_desc(&vs->dev, vq, vq->iov, | |
430 | ARRAY_SIZE(vq->iov), &out, &in, | |
431 | NULL, NULL); | |
432 | if (head < 0) { | |
433 | vs->vs_events_missed = true; | |
434 | return; | |
435 | } | |
436 | if (head == vq->num) { | |
437 | if (vhost_enable_notify(&vs->dev, vq)) | |
438 | goto again; | |
439 | vs->vs_events_missed = true; | |
440 | return; | |
441 | } | |
442 | ||
443 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { | |
444 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", | |
445 | vq->iov[out].iov_len); | |
446 | vs->vs_events_missed = true; | |
447 | return; | |
448 | } | |
449 | ||
450 | if (vs->vs_events_missed) { | |
451 | event->event |= VIRTIO_SCSI_T_EVENTS_MISSED; | |
452 | vs->vs_events_missed = false; | |
453 | } | |
454 | ||
455 | eventp = vq->iov[out].iov_base; | |
456 | ret = __copy_to_user(eventp, event, sizeof(*event)); | |
457 | if (!ret) | |
458 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
459 | else | |
460 | vq_err(vq, "Faulted on tcm_vhost_send_event\n"); | |
461 | } | |
462 | ||
463 | static void tcm_vhost_evt_work(struct vhost_work *work) | |
464 | { | |
465 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
466 | vs_event_work); | |
3ab2e420 | 467 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
468 | struct tcm_vhost_evt *evt; |
469 | struct llist_node *llnode; | |
470 | ||
471 | mutex_lock(&vq->mutex); | |
472 | llnode = llist_del_all(&vs->vs_event_list); | |
473 | while (llnode) { | |
474 | evt = llist_entry(llnode, struct tcm_vhost_evt, list); | |
475 | llnode = llist_next(llnode); | |
476 | tcm_vhost_do_evt_work(vs, evt); | |
477 | tcm_vhost_free_evt(vs, evt); | |
478 | } | |
479 | mutex_unlock(&vq->mutex); | |
480 | } | |
481 | ||
057cbf49 NB |
482 | /* Fill in status and signal that we are done processing this command |
483 | * | |
484 | * This is scheduled in the vhost work queue so we are called with the owner | |
485 | * process mm and can access the vring. | |
486 | */ | |
487 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) | |
488 | { | |
489 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
490 | vs_completion_work); | |
1b7f390e | 491 | DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 492 | struct virtio_scsi_cmd_resp v_rsp; |
057cbf49 | 493 | struct tcm_vhost_cmd *tv_cmd; |
9d6064a3 AH |
494 | struct llist_node *llnode; |
495 | struct se_cmd *se_cmd; | |
1b7f390e | 496 | int ret, vq; |
057cbf49 | 497 | |
1b7f390e | 498 | bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 AH |
499 | llnode = llist_del_all(&vs->vs_completion_list); |
500 | while (llnode) { | |
501 | tv_cmd = llist_entry(llnode, struct tcm_vhost_cmd, | |
502 | tvc_completion_list); | |
503 | llnode = llist_next(llnode); | |
504 | se_cmd = &tv_cmd->tvc_se_cmd; | |
057cbf49 NB |
505 | |
506 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
507 | tv_cmd, se_cmd->residual_count, se_cmd->scsi_status); | |
508 | ||
509 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
510 | v_rsp.resid = se_cmd->residual_count; | |
511 | /* TODO is status_qualifier field needed? */ | |
512 | v_rsp.status = se_cmd->scsi_status; | |
513 | v_rsp.sense_len = se_cmd->scsi_sense_length; | |
514 | memcpy(v_rsp.sense, tv_cmd->tvc_sense_buf, | |
515 | v_rsp.sense_len); | |
516 | ret = copy_to_user(tv_cmd->tvc_resp, &v_rsp, sizeof(v_rsp)); | |
1b7f390e | 517 | if (likely(ret == 0)) { |
3ab2e420 | 518 | struct vhost_scsi_virtqueue *q; |
1b7f390e | 519 | vhost_add_used(tv_cmd->tvc_vq, tv_cmd->tvc_vq_desc, 0); |
3ab2e420 AH |
520 | q = container_of(tv_cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); |
521 | vq = q - vs->vqs; | |
1b7f390e AH |
522 | __set_bit(vq, signal); |
523 | } else | |
057cbf49 NB |
524 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
525 | ||
526 | vhost_scsi_free_cmd(tv_cmd); | |
527 | } | |
528 | ||
1b7f390e AH |
529 | vq = -1; |
530 | while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) | |
531 | < VHOST_SCSI_MAX_VQ) | |
3ab2e420 | 532 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
533 | } |
534 | ||
057cbf49 NB |
535 | static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd( |
536 | struct tcm_vhost_tpg *tv_tpg, | |
537 | struct virtio_scsi_cmd_req *v_req, | |
538 | u32 exp_data_len, | |
539 | int data_direction) | |
540 | { | |
541 | struct tcm_vhost_cmd *tv_cmd; | |
542 | struct tcm_vhost_nexus *tv_nexus; | |
057cbf49 NB |
543 | |
544 | tv_nexus = tv_tpg->tpg_nexus; | |
545 | if (!tv_nexus) { | |
546 | pr_err("Unable to locate active struct tcm_vhost_nexus\n"); | |
547 | return ERR_PTR(-EIO); | |
548 | } | |
057cbf49 NB |
549 | |
550 | tv_cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC); | |
551 | if (!tv_cmd) { | |
552 | pr_err("Unable to allocate struct tcm_vhost_cmd\n"); | |
553 | return ERR_PTR(-ENOMEM); | |
554 | } | |
057cbf49 | 555 | tv_cmd->tvc_tag = v_req->tag; |
9f0abc15 NB |
556 | tv_cmd->tvc_task_attr = v_req->task_attr; |
557 | tv_cmd->tvc_exp_data_len = exp_data_len; | |
558 | tv_cmd->tvc_data_direction = data_direction; | |
559 | tv_cmd->tvc_nexus = tv_nexus; | |
057cbf49 | 560 | |
057cbf49 NB |
561 | return tv_cmd; |
562 | } | |
563 | ||
564 | /* | |
565 | * Map a user memory range into a scatterlist | |
566 | * | |
567 | * Returns the number of scatterlist entries used or -errno on error. | |
568 | */ | |
569 | static int vhost_scsi_map_to_sgl(struct scatterlist *sgl, | |
1810053e | 570 | unsigned int sgl_count, struct iovec *iov, int write) |
057cbf49 | 571 | { |
1810053e | 572 | unsigned int npages = 0, pages_nr, offset, nbytes; |
057cbf49 | 573 | struct scatterlist *sg = sgl; |
1810053e AH |
574 | void __user *ptr = iov->iov_base; |
575 | size_t len = iov->iov_len; | |
576 | struct page **pages; | |
577 | int ret, i; | |
057cbf49 | 578 | |
1810053e AH |
579 | pages_nr = iov_num_pages(iov); |
580 | if (pages_nr > sgl_count) | |
581 | return -ENOBUFS; | |
057cbf49 | 582 | |
1810053e AH |
583 | pages = kmalloc(pages_nr * sizeof(struct page *), GFP_KERNEL); |
584 | if (!pages) | |
585 | return -ENOMEM; | |
057cbf49 | 586 | |
1810053e AH |
587 | ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages); |
588 | /* No pages were pinned */ | |
589 | if (ret < 0) | |
590 | goto out; | |
591 | /* Less pages pinned than wanted */ | |
592 | if (ret != pages_nr) { | |
593 | for (i = 0; i < ret; i++) | |
594 | put_page(pages[i]); | |
595 | ret = -EFAULT; | |
596 | goto out; | |
597 | } | |
598 | ||
599 | while (len > 0) { | |
600 | offset = (uintptr_t)ptr & ~PAGE_MASK; | |
601 | nbytes = min_t(unsigned int, PAGE_SIZE - offset, len); | |
602 | sg_set_page(sg, pages[npages], nbytes, offset); | |
057cbf49 NB |
603 | ptr += nbytes; |
604 | len -= nbytes; | |
605 | sg++; | |
606 | npages++; | |
607 | } | |
057cbf49 | 608 | |
1810053e AH |
609 | out: |
610 | kfree(pages); | |
057cbf49 NB |
611 | return ret; |
612 | } | |
613 | ||
614 | static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd, | |
615 | struct iovec *iov, unsigned int niov, int write) | |
616 | { | |
617 | int ret; | |
618 | unsigned int i; | |
619 | u32 sgl_count; | |
620 | struct scatterlist *sg; | |
621 | ||
622 | /* | |
623 | * Find out how long sglist needs to be | |
624 | */ | |
625 | sgl_count = 0; | |
f3158f36 AH |
626 | for (i = 0; i < niov; i++) |
627 | sgl_count += iov_num_pages(&iov[i]); | |
628 | ||
057cbf49 NB |
629 | /* TODO overflow checking */ |
630 | ||
631 | sg = kmalloc(sizeof(tv_cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC); | |
632 | if (!sg) | |
633 | return -ENOMEM; | |
f0e0e9bb FW |
634 | pr_debug("%s sg %p sgl_count %u is_err %d\n", __func__, |
635 | sg, sgl_count, !sg); | |
057cbf49 NB |
636 | sg_init_table(sg, sgl_count); |
637 | ||
638 | tv_cmd->tvc_sgl = sg; | |
639 | tv_cmd->tvc_sgl_count = sgl_count; | |
640 | ||
641 | pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count); | |
642 | for (i = 0; i < niov; i++) { | |
1810053e | 643 | ret = vhost_scsi_map_to_sgl(sg, sgl_count, &iov[i], write); |
057cbf49 NB |
644 | if (ret < 0) { |
645 | for (i = 0; i < tv_cmd->tvc_sgl_count; i++) | |
646 | put_page(sg_page(&tv_cmd->tvc_sgl[i])); | |
647 | kfree(tv_cmd->tvc_sgl); | |
648 | tv_cmd->tvc_sgl = NULL; | |
649 | tv_cmd->tvc_sgl_count = 0; | |
650 | return ret; | |
651 | } | |
652 | ||
653 | sg += ret; | |
654 | sgl_count -= ret; | |
655 | } | |
656 | return 0; | |
657 | } | |
658 | ||
659 | static void tcm_vhost_submission_work(struct work_struct *work) | |
660 | { | |
661 | struct tcm_vhost_cmd *tv_cmd = | |
662 | container_of(work, struct tcm_vhost_cmd, work); | |
9f0abc15 | 663 | struct tcm_vhost_nexus *tv_nexus; |
057cbf49 NB |
664 | struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd; |
665 | struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL; | |
666 | int rc, sg_no_bidi = 0; | |
057cbf49 NB |
667 | |
668 | if (tv_cmd->tvc_sgl_count) { | |
669 | sg_ptr = tv_cmd->tvc_sgl; | |
057cbf49 NB |
670 | /* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */ |
671 | #if 0 | |
672 | if (se_cmd->se_cmd_flags & SCF_BIDI) { | |
673 | sg_bidi_ptr = NULL; | |
674 | sg_no_bidi = 0; | |
675 | } | |
676 | #endif | |
677 | } else { | |
678 | sg_ptr = NULL; | |
679 | } | |
9f0abc15 NB |
680 | tv_nexus = tv_cmd->tvc_nexus; |
681 | ||
682 | rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, | |
683 | tv_cmd->tvc_cdb, &tv_cmd->tvc_sense_buf[0], | |
684 | tv_cmd->tvc_lun, tv_cmd->tvc_exp_data_len, | |
685 | tv_cmd->tvc_task_attr, tv_cmd->tvc_data_direction, | |
686 | 0, sg_ptr, tv_cmd->tvc_sgl_count, | |
687 | sg_bidi_ptr, sg_no_bidi); | |
057cbf49 NB |
688 | if (rc < 0) { |
689 | transport_send_check_condition_and_sense(se_cmd, | |
9f0abc15 | 690 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
057cbf49 | 691 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 692 | } |
057cbf49 NB |
693 | } |
694 | ||
637ab21e AH |
695 | static void vhost_scsi_send_bad_target(struct vhost_scsi *vs, |
696 | struct vhost_virtqueue *vq, int head, unsigned out) | |
697 | { | |
698 | struct virtio_scsi_cmd_resp __user *resp; | |
699 | struct virtio_scsi_cmd_resp rsp; | |
700 | int ret; | |
701 | ||
702 | memset(&rsp, 0, sizeof(rsp)); | |
703 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
704 | resp = vq->iov[out].iov_base; | |
705 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
706 | if (!ret) | |
707 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
708 | else | |
709 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
710 | } | |
711 | ||
1b7f390e AH |
712 | static void vhost_scsi_handle_vq(struct vhost_scsi *vs, |
713 | struct vhost_virtqueue *vq) | |
057cbf49 | 714 | { |
4f7f46d3 | 715 | struct tcm_vhost_tpg **vs_tpg; |
057cbf49 NB |
716 | struct virtio_scsi_cmd_req v_req; |
717 | struct tcm_vhost_tpg *tv_tpg; | |
718 | struct tcm_vhost_cmd *tv_cmd; | |
719 | u32 exp_data_len, data_first, data_num, data_direction; | |
720 | unsigned out, in, i; | |
721 | int head, ret; | |
67e18cf9 | 722 | u8 target; |
057cbf49 | 723 | |
4f7f46d3 AH |
724 | /* |
725 | * We can handle the vq only after the endpoint is setup by calling the | |
726 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
727 | * | |
728 | * TODO: Check that we are running from vhost_worker which acts | |
729 | * as read-side critical section for vhost kind of RCU. | |
730 | * See the comments in struct vhost_virtqueue in drivers/vhost/vhost.h | |
731 | */ | |
732 | vs_tpg = rcu_dereference_check(vq->private_data, 1); | |
733 | if (!vs_tpg) | |
057cbf49 | 734 | return; |
057cbf49 NB |
735 | |
736 | mutex_lock(&vq->mutex); | |
737 | vhost_disable_notify(&vs->dev, vq); | |
738 | ||
739 | for (;;) { | |
740 | head = vhost_get_vq_desc(&vs->dev, vq, vq->iov, | |
741 | ARRAY_SIZE(vq->iov), &out, &in, | |
742 | NULL, NULL); | |
743 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", | |
744 | head, out, in); | |
745 | /* On error, stop handling until the next kick. */ | |
746 | if (unlikely(head < 0)) | |
747 | break; | |
748 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
749 | if (head == vq->num) { | |
750 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
751 | vhost_disable_notify(&vs->dev, vq); | |
752 | continue; | |
753 | } | |
754 | break; | |
755 | } | |
756 | ||
757 | /* FIXME: BIDI operation */ | |
758 | if (out == 1 && in == 1) { | |
759 | data_direction = DMA_NONE; | |
760 | data_first = 0; | |
761 | data_num = 0; | |
762 | } else if (out == 1 && in > 1) { | |
763 | data_direction = DMA_FROM_DEVICE; | |
764 | data_first = out + 1; | |
765 | data_num = in - 1; | |
766 | } else if (out > 1 && in == 1) { | |
767 | data_direction = DMA_TO_DEVICE; | |
768 | data_first = 1; | |
769 | data_num = out - 1; | |
770 | } else { | |
771 | vq_err(vq, "Invalid buffer layout out: %u in: %u\n", | |
772 | out, in); | |
773 | break; | |
774 | } | |
775 | ||
776 | /* | |
777 | * Check for a sane resp buffer so we can report errors to | |
778 | * the guest. | |
779 | */ | |
780 | if (unlikely(vq->iov[out].iov_len != | |
781 | sizeof(struct virtio_scsi_cmd_resp))) { | |
782 | vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu" | |
783 | " bytes\n", vq->iov[out].iov_len); | |
784 | break; | |
785 | } | |
786 | ||
787 | if (unlikely(vq->iov[0].iov_len != sizeof(v_req))) { | |
788 | vq_err(vq, "Expecting virtio_scsi_cmd_req, got %zu" | |
789 | " bytes\n", vq->iov[0].iov_len); | |
790 | break; | |
791 | } | |
792 | pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p," | |
793 | " len: %zu\n", vq->iov[0].iov_base, sizeof(v_req)); | |
794 | ret = __copy_from_user(&v_req, vq->iov[0].iov_base, | |
795 | sizeof(v_req)); | |
796 | if (unlikely(ret)) { | |
797 | vq_err(vq, "Faulted on virtio_scsi_cmd_req\n"); | |
798 | break; | |
799 | } | |
800 | ||
67e18cf9 AH |
801 | /* Extract the tpgt */ |
802 | target = v_req.lun[1]; | |
4f7f46d3 | 803 | tv_tpg = ACCESS_ONCE(vs_tpg[target]); |
67e18cf9 AH |
804 | |
805 | /* Target does not exist, fail the request */ | |
806 | if (unlikely(!tv_tpg)) { | |
637ab21e | 807 | vhost_scsi_send_bad_target(vs, vq, head, out); |
67e18cf9 AH |
808 | continue; |
809 | } | |
810 | ||
057cbf49 NB |
811 | exp_data_len = 0; |
812 | for (i = 0; i < data_num; i++) | |
813 | exp_data_len += vq->iov[data_first + i].iov_len; | |
814 | ||
815 | tv_cmd = vhost_scsi_allocate_cmd(tv_tpg, &v_req, | |
816 | exp_data_len, data_direction); | |
817 | if (IS_ERR(tv_cmd)) { | |
818 | vq_err(vq, "vhost_scsi_allocate_cmd failed %ld\n", | |
819 | PTR_ERR(tv_cmd)); | |
055f648c | 820 | goto err_cmd; |
057cbf49 NB |
821 | } |
822 | pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction" | |
823 | ": %d\n", tv_cmd, exp_data_len, data_direction); | |
824 | ||
825 | tv_cmd->tvc_vhost = vs; | |
1b7f390e | 826 | tv_cmd->tvc_vq = vq; |
057cbf49 NB |
827 | tv_cmd->tvc_resp = vq->iov[out].iov_base; |
828 | ||
829 | /* | |
830 | * Copy in the recieved CDB descriptor into tv_cmd->tvc_cdb | |
831 | * that will be used by tcm_vhost_new_cmd_map() and down into | |
832 | * target_setup_cmd_from_cdb() | |
833 | */ | |
834 | memcpy(tv_cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE); | |
835 | /* | |
836 | * Check that the recieved CDB size does not exceeded our | |
837 | * hardcoded max for tcm_vhost | |
838 | */ | |
839 | /* TODO what if cdb was too small for varlen cdb header? */ | |
840 | if (unlikely(scsi_command_size(tv_cmd->tvc_cdb) > | |
841 | TCM_VHOST_MAX_CDB_SIZE)) { | |
842 | vq_err(vq, "Received SCSI CDB with command_size: %d that" | |
843 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
844 | scsi_command_size(tv_cmd->tvc_cdb), | |
845 | TCM_VHOST_MAX_CDB_SIZE); | |
055f648c | 846 | goto err_free; |
057cbf49 NB |
847 | } |
848 | tv_cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; | |
849 | ||
850 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", | |
851 | tv_cmd->tvc_cdb[0], tv_cmd->tvc_lun); | |
852 | ||
853 | if (data_direction != DMA_NONE) { | |
854 | ret = vhost_scsi_map_iov_to_sgl(tv_cmd, | |
855 | &vq->iov[data_first], data_num, | |
856 | data_direction == DMA_TO_DEVICE); | |
857 | if (unlikely(ret)) { | |
858 | vq_err(vq, "Failed to map iov to sgl\n"); | |
055f648c | 859 | goto err_free; |
057cbf49 NB |
860 | } |
861 | } | |
862 | ||
863 | /* | |
864 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
865 | * complete the virtio-scsi request in TCM callback context via | |
866 | * tcm_vhost_queue_data_in() and tcm_vhost_queue_status() | |
867 | */ | |
868 | tv_cmd->tvc_vq_desc = head; | |
869 | /* | |
870 | * Dispatch tv_cmd descriptor for cmwq execution in process | |
871 | * context provided by tcm_vhost_workqueue. This also ensures | |
872 | * tv_cmd is executed on the same kworker CPU as this vhost | |
873 | * thread to gain positive L2 cache locality effects.. | |
874 | */ | |
875 | INIT_WORK(&tv_cmd->work, tcm_vhost_submission_work); | |
876 | queue_work(tcm_vhost_workqueue, &tv_cmd->work); | |
877 | } | |
878 | ||
879 | mutex_unlock(&vq->mutex); | |
7ea206cf AH |
880 | return; |
881 | ||
055f648c | 882 | err_free: |
7ea206cf | 883 | vhost_scsi_free_cmd(tv_cmd); |
055f648c AH |
884 | err_cmd: |
885 | vhost_scsi_send_bad_target(vs, vq, head, out); | |
7ea206cf | 886 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
887 | } |
888 | ||
889 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) | |
890 | { | |
101998f6 | 891 | pr_debug("%s: The handling func for control queue.\n", __func__); |
057cbf49 NB |
892 | } |
893 | ||
a6c9af87 AH |
894 | static void tcm_vhost_send_evt(struct vhost_scsi *vs, struct tcm_vhost_tpg *tpg, |
895 | struct se_lun *lun, u32 event, u32 reason) | |
896 | { | |
897 | struct tcm_vhost_evt *evt; | |
898 | ||
899 | evt = tcm_vhost_allocate_evt(vs, event, reason); | |
900 | if (!evt) | |
901 | return; | |
902 | ||
903 | if (tpg && lun) { | |
904 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
905 | /* | |
906 | * Note: evt->event is zeroed when we allocate it and | |
907 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
908 | */ | |
909 | evt->event.lun[0] = 0x01; | |
910 | evt->event.lun[1] = tpg->tport_tpgt & 0xFF; | |
911 | if (lun->unpacked_lun >= 256) | |
912 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
913 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
914 | } | |
915 | ||
916 | llist_add(&evt->list, &vs->vs_event_list); | |
917 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
918 | } | |
919 | ||
057cbf49 NB |
920 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
921 | { | |
a6c9af87 AH |
922 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
923 | poll.work); | |
924 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
925 | ||
926 | mutex_lock(&vq->mutex); | |
927 | if (!vq->private_data) | |
928 | goto out; | |
929 | ||
930 | if (vs->vs_events_missed) | |
931 | tcm_vhost_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); | |
932 | out: | |
933 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
934 | } |
935 | ||
936 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
937 | { | |
938 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
939 | poll.work); | |
940 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
941 | ||
1b7f390e | 942 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
943 | } |
944 | ||
4f7f46d3 AH |
945 | static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
946 | { | |
3ab2e420 | 947 | vhost_poll_flush(&vs->vqs[index].vq.poll); |
4f7f46d3 AH |
948 | } |
949 | ||
950 | static void vhost_scsi_flush(struct vhost_scsi *vs) | |
951 | { | |
952 | int i; | |
953 | ||
954 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
955 | vhost_scsi_flush_vq(vs, i); | |
956 | vhost_work_flush(&vs->dev, &vs->vs_completion_work); | |
a6c9af87 | 957 | vhost_work_flush(&vs->dev, &vs->vs_event_work); |
4f7f46d3 AH |
958 | } |
959 | ||
057cbf49 NB |
960 | /* |
961 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
962 | * tcm_vhost_tpg with an active struct tcm_vhost_nexus | |
f2b7daf5 AH |
963 | * |
964 | * The lock nesting rule is: | |
965 | * tcm_vhost_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex | |
057cbf49 NB |
966 | */ |
967 | static int vhost_scsi_set_endpoint( | |
968 | struct vhost_scsi *vs, | |
969 | struct vhost_scsi_target *t) | |
970 | { | |
971 | struct tcm_vhost_tport *tv_tport; | |
972 | struct tcm_vhost_tpg *tv_tpg; | |
4f7f46d3 AH |
973 | struct tcm_vhost_tpg **vs_tpg; |
974 | struct vhost_virtqueue *vq; | |
975 | int index, ret, i, len; | |
67e18cf9 | 976 | bool match = false; |
057cbf49 | 977 | |
f2b7daf5 | 978 | mutex_lock(&tcm_vhost_mutex); |
057cbf49 | 979 | mutex_lock(&vs->dev.mutex); |
f2b7daf5 | 980 | |
057cbf49 NB |
981 | /* Verify that ring has been setup correctly. */ |
982 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
983 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 984 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
985 | ret = -EFAULT; |
986 | goto out; | |
057cbf49 NB |
987 | } |
988 | } | |
057cbf49 | 989 | |
4f7f46d3 AH |
990 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
991 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
992 | if (!vs_tpg) { | |
f2b7daf5 AH |
993 | ret = -ENOMEM; |
994 | goto out; | |
4f7f46d3 AH |
995 | } |
996 | if (vs->vs_tpg) | |
997 | memcpy(vs_tpg, vs->vs_tpg, len); | |
998 | ||
057cbf49 NB |
999 | list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) { |
1000 | mutex_lock(&tv_tpg->tv_tpg_mutex); | |
1001 | if (!tv_tpg->tpg_nexus) { | |
1002 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1003 | continue; | |
1004 | } | |
101998f6 | 1005 | if (tv_tpg->tv_tpg_vhost_count != 0) { |
057cbf49 NB |
1006 | mutex_unlock(&tv_tpg->tv_tpg_mutex); |
1007 | continue; | |
1008 | } | |
1009 | tv_tport = tv_tpg->tport; | |
1010 | ||
67e18cf9 | 1011 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
4f7f46d3 | 1012 | if (vs->vs_tpg && vs->vs_tpg[tv_tpg->tport_tpgt]) { |
4f7f46d3 | 1013 | kfree(vs_tpg); |
f2b7daf5 AH |
1014 | mutex_unlock(&tv_tpg->tv_tpg_mutex); |
1015 | ret = -EEXIST; | |
1016 | goto out; | |
101998f6 | 1017 | } |
67e18cf9 | 1018 | tv_tpg->tv_tpg_vhost_count++; |
a6c9af87 | 1019 | tv_tpg->vhost_scsi = vs; |
4f7f46d3 | 1020 | vs_tpg[tv_tpg->tport_tpgt] = tv_tpg; |
057cbf49 | 1021 | smp_mb__after_atomic_inc(); |
67e18cf9 | 1022 | match = true; |
057cbf49 NB |
1023 | } |
1024 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1025 | } | |
67e18cf9 AH |
1026 | |
1027 | if (match) { | |
1028 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1029 | sizeof(vs->vs_vhost_wwpn)); | |
4f7f46d3 | 1030 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
3ab2e420 | 1031 | vq = &vs->vqs[i].vq; |
4f7f46d3 AH |
1032 | /* Flushing the vhost_work acts as synchronize_rcu */ |
1033 | mutex_lock(&vq->mutex); | |
1034 | rcu_assign_pointer(vq->private_data, vs_tpg); | |
dfd5d569 | 1035 | vhost_init_used(vq); |
4f7f46d3 AH |
1036 | mutex_unlock(&vq->mutex); |
1037 | } | |
67e18cf9 AH |
1038 | ret = 0; |
1039 | } else { | |
1040 | ret = -EEXIST; | |
1041 | } | |
1042 | ||
4f7f46d3 AH |
1043 | /* |
1044 | * Act as synchronize_rcu to make sure access to | |
1045 | * old vs->vs_tpg is finished. | |
1046 | */ | |
1047 | vhost_scsi_flush(vs); | |
1048 | kfree(vs->vs_tpg); | |
1049 | vs->vs_tpg = vs_tpg; | |
1050 | ||
f2b7daf5 | 1051 | out: |
67e18cf9 | 1052 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1053 | mutex_unlock(&tcm_vhost_mutex); |
67e18cf9 | 1054 | return ret; |
057cbf49 NB |
1055 | } |
1056 | ||
1057 | static int vhost_scsi_clear_endpoint( | |
1058 | struct vhost_scsi *vs, | |
1059 | struct vhost_scsi_target *t) | |
1060 | { | |
1061 | struct tcm_vhost_tport *tv_tport; | |
1062 | struct tcm_vhost_tpg *tv_tpg; | |
4f7f46d3 AH |
1063 | struct vhost_virtqueue *vq; |
1064 | bool match = false; | |
67e18cf9 AH |
1065 | int index, ret, i; |
1066 | u8 target; | |
057cbf49 | 1067 | |
f2b7daf5 | 1068 | mutex_lock(&tcm_vhost_mutex); |
057cbf49 NB |
1069 | mutex_lock(&vs->dev.mutex); |
1070 | /* Verify that ring has been setup correctly. */ | |
1071 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1072 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1073 | ret = -EFAULT; |
038e0af4 | 1074 | goto err_dev; |
057cbf49 NB |
1075 | } |
1076 | } | |
4f7f46d3 AH |
1077 | |
1078 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1079 | ret = 0; |
1080 | goto err_dev; | |
4f7f46d3 AH |
1081 | } |
1082 | ||
67e18cf9 AH |
1083 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1084 | target = i; | |
67e18cf9 AH |
1085 | tv_tpg = vs->vs_tpg[target]; |
1086 | if (!tv_tpg) | |
1087 | continue; | |
1088 | ||
038e0af4 | 1089 | mutex_lock(&tv_tpg->tv_tpg_mutex); |
67e18cf9 AH |
1090 | tv_tport = tv_tpg->tport; |
1091 | if (!tv_tport) { | |
1092 | ret = -ENODEV; | |
038e0af4 | 1093 | goto err_tpg; |
67e18cf9 AH |
1094 | } |
1095 | ||
1096 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
1097 | pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu" | |
1098 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", | |
1099 | tv_tport->tport_name, tv_tpg->tport_tpgt, | |
1100 | t->vhost_wwpn, t->vhost_tpgt); | |
1101 | ret = -EINVAL; | |
038e0af4 | 1102 | goto err_tpg; |
67e18cf9 AH |
1103 | } |
1104 | tv_tpg->tv_tpg_vhost_count--; | |
a6c9af87 | 1105 | tv_tpg->vhost_scsi = NULL; |
67e18cf9 | 1106 | vs->vs_tpg[target] = NULL; |
4f7f46d3 | 1107 | match = true; |
038e0af4 | 1108 | mutex_unlock(&tv_tpg->tv_tpg_mutex); |
057cbf49 | 1109 | } |
4f7f46d3 AH |
1110 | if (match) { |
1111 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
3ab2e420 | 1112 | vq = &vs->vqs[i].vq; |
4f7f46d3 AH |
1113 | /* Flushing the vhost_work acts as synchronize_rcu */ |
1114 | mutex_lock(&vq->mutex); | |
1115 | rcu_assign_pointer(vq->private_data, NULL); | |
1116 | mutex_unlock(&vq->mutex); | |
1117 | } | |
1118 | } | |
1119 | /* | |
1120 | * Act as synchronize_rcu to make sure access to | |
1121 | * old vs->vs_tpg is finished. | |
1122 | */ | |
1123 | vhost_scsi_flush(vs); | |
1124 | kfree(vs->vs_tpg); | |
1125 | vs->vs_tpg = NULL; | |
a6c9af87 | 1126 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1127 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1128 | mutex_unlock(&tcm_vhost_mutex); |
057cbf49 | 1129 | return 0; |
101998f6 | 1130 | |
038e0af4 AH |
1131 | err_tpg: |
1132 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1133 | err_dev: | |
101998f6 | 1134 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1135 | mutex_unlock(&tcm_vhost_mutex); |
101998f6 | 1136 | return ret; |
057cbf49 NB |
1137 | } |
1138 | ||
4f7f46d3 AH |
1139 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1140 | { | |
1141 | if (features & ~VHOST_SCSI_FEATURES) | |
1142 | return -EOPNOTSUPP; | |
1143 | ||
1144 | mutex_lock(&vs->dev.mutex); | |
1145 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1146 | !vhost_log_access_ok(&vs->dev)) { | |
1147 | mutex_unlock(&vs->dev.mutex); | |
1148 | return -EFAULT; | |
1149 | } | |
1150 | vs->dev.acked_features = features; | |
1151 | smp_wmb(); | |
1152 | vhost_scsi_flush(vs); | |
1153 | mutex_unlock(&vs->dev.mutex); | |
1154 | return 0; | |
1155 | } | |
1156 | ||
057cbf49 NB |
1157 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1158 | { | |
1159 | struct vhost_scsi *s; | |
3ab2e420 | 1160 | struct vhost_virtqueue **vqs; |
1b7f390e | 1161 | int r, i; |
057cbf49 NB |
1162 | |
1163 | s = kzalloc(sizeof(*s), GFP_KERNEL); | |
1164 | if (!s) | |
1165 | return -ENOMEM; | |
1166 | ||
3ab2e420 AH |
1167 | vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL); |
1168 | if (!vqs) { | |
1169 | kfree(s); | |
1170 | return -ENOMEM; | |
1171 | } | |
1172 | ||
057cbf49 | 1173 | vhost_work_init(&s->vs_completion_work, vhost_scsi_complete_cmd_work); |
a6c9af87 AH |
1174 | vhost_work_init(&s->vs_event_work, tcm_vhost_evt_work); |
1175 | ||
1176 | s->vs_events_nr = 0; | |
1177 | s->vs_events_missed = false; | |
057cbf49 | 1178 | |
3ab2e420 AH |
1179 | vqs[VHOST_SCSI_VQ_CTL] = &s->vqs[VHOST_SCSI_VQ_CTL].vq; |
1180 | vqs[VHOST_SCSI_VQ_EVT] = &s->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1181 | s->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1182 | s->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
1183 | for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { | |
1184 | vqs[i] = &s->vqs[i].vq; | |
1185 | s->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
1186 | } | |
1187 | r = vhost_dev_init(&s->dev, vqs, VHOST_SCSI_MAX_VQ); | |
057cbf49 | 1188 | if (r < 0) { |
3ab2e420 | 1189 | kfree(vqs); |
057cbf49 NB |
1190 | kfree(s); |
1191 | return r; | |
1192 | } | |
1193 | ||
1194 | f->private_data = s; | |
1195 | return 0; | |
1196 | } | |
1197 | ||
1198 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1199 | { | |
1200 | struct vhost_scsi *s = f->private_data; | |
67e18cf9 | 1201 | struct vhost_scsi_target t; |
057cbf49 | 1202 | |
67e18cf9 AH |
1203 | mutex_lock(&s->dev.mutex); |
1204 | memcpy(t.vhost_wwpn, s->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1205 | mutex_unlock(&s->dev.mutex); | |
1206 | vhost_scsi_clear_endpoint(s, &t); | |
b211616d | 1207 | vhost_dev_stop(&s->dev); |
057cbf49 | 1208 | vhost_dev_cleanup(&s->dev, false); |
a6c9af87 AH |
1209 | /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
1210 | vhost_scsi_flush(s); | |
3ab2e420 | 1211 | kfree(s->dev.vqs); |
057cbf49 NB |
1212 | kfree(s); |
1213 | return 0; | |
1214 | } | |
1215 | ||
057cbf49 NB |
1216 | static long vhost_scsi_ioctl(struct file *f, unsigned int ioctl, |
1217 | unsigned long arg) | |
1218 | { | |
1219 | struct vhost_scsi *vs = f->private_data; | |
1220 | struct vhost_scsi_target backend; | |
1221 | void __user *argp = (void __user *)arg; | |
1222 | u64 __user *featurep = argp; | |
11c63418 AH |
1223 | u32 __user *eventsp = argp; |
1224 | u32 events_missed; | |
057cbf49 | 1225 | u64 features; |
101998f6 | 1226 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1227 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1228 | |
1229 | switch (ioctl) { | |
1230 | case VHOST_SCSI_SET_ENDPOINT: | |
1231 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1232 | return -EFAULT; | |
6de7145c MT |
1233 | if (backend.reserved != 0) |
1234 | return -EOPNOTSUPP; | |
057cbf49 NB |
1235 | |
1236 | return vhost_scsi_set_endpoint(vs, &backend); | |
1237 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1238 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1239 | return -EFAULT; | |
6de7145c MT |
1240 | if (backend.reserved != 0) |
1241 | return -EOPNOTSUPP; | |
057cbf49 NB |
1242 | |
1243 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1244 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1245 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1246 | return -EFAULT; |
1247 | return 0; | |
11c63418 AH |
1248 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1249 | if (get_user(events_missed, eventsp)) | |
1250 | return -EFAULT; | |
1251 | mutex_lock(&vq->mutex); | |
1252 | vs->vs_events_missed = events_missed; | |
1253 | mutex_unlock(&vq->mutex); | |
1254 | return 0; | |
1255 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1256 | mutex_lock(&vq->mutex); | |
1257 | events_missed = vs->vs_events_missed; | |
1258 | mutex_unlock(&vq->mutex); | |
1259 | if (put_user(events_missed, eventsp)) | |
1260 | return -EFAULT; | |
1261 | return 0; | |
057cbf49 | 1262 | case VHOST_GET_FEATURES: |
5dade710 | 1263 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1264 | if (copy_to_user(featurep, &features, sizeof features)) |
1265 | return -EFAULT; | |
1266 | return 0; | |
1267 | case VHOST_SET_FEATURES: | |
1268 | if (copy_from_user(&features, featurep, sizeof features)) | |
1269 | return -EFAULT; | |
1270 | return vhost_scsi_set_features(vs, features); | |
1271 | default: | |
1272 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1273 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1274 | /* TODO: flush backend after dev ioctl. */ | |
1275 | if (r == -ENOIOCTLCMD) | |
1276 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1277 | mutex_unlock(&vs->dev.mutex); |
1278 | return r; | |
1279 | } | |
1280 | } | |
1281 | ||
101998f6 NB |
1282 | #ifdef CONFIG_COMPAT |
1283 | static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, | |
1284 | unsigned long arg) | |
1285 | { | |
1286 | return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1287 | } | |
1288 | #endif | |
1289 | ||
057cbf49 NB |
1290 | static const struct file_operations vhost_scsi_fops = { |
1291 | .owner = THIS_MODULE, | |
1292 | .release = vhost_scsi_release, | |
1293 | .unlocked_ioctl = vhost_scsi_ioctl, | |
101998f6 NB |
1294 | #ifdef CONFIG_COMPAT |
1295 | .compat_ioctl = vhost_scsi_compat_ioctl, | |
1296 | #endif | |
057cbf49 NB |
1297 | .open = vhost_scsi_open, |
1298 | .llseek = noop_llseek, | |
1299 | }; | |
1300 | ||
1301 | static struct miscdevice vhost_scsi_misc = { | |
1302 | MISC_DYNAMIC_MINOR, | |
1303 | "vhost-scsi", | |
1304 | &vhost_scsi_fops, | |
1305 | }; | |
1306 | ||
1307 | static int __init vhost_scsi_register(void) | |
1308 | { | |
1309 | return misc_register(&vhost_scsi_misc); | |
1310 | } | |
1311 | ||
1312 | static int vhost_scsi_deregister(void) | |
1313 | { | |
1314 | return misc_deregister(&vhost_scsi_misc); | |
1315 | } | |
1316 | ||
1317 | static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport) | |
1318 | { | |
1319 | switch (tport->tport_proto_id) { | |
1320 | case SCSI_PROTOCOL_SAS: | |
1321 | return "SAS"; | |
1322 | case SCSI_PROTOCOL_FCP: | |
1323 | return "FCP"; | |
1324 | case SCSI_PROTOCOL_ISCSI: | |
1325 | return "iSCSI"; | |
1326 | default: | |
1327 | break; | |
1328 | } | |
1329 | ||
1330 | return "Unknown"; | |
1331 | } | |
1332 | ||
a6c9af87 AH |
1333 | static void tcm_vhost_do_plug(struct tcm_vhost_tpg *tpg, |
1334 | struct se_lun *lun, bool plug) | |
1335 | { | |
1336 | ||
1337 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1338 | struct vhost_virtqueue *vq; | |
1339 | u32 reason; | |
1340 | ||
1341 | if (!vs) | |
1342 | return; | |
1343 | ||
1344 | mutex_lock(&vs->dev.mutex); | |
1345 | if (!vhost_has_feature(&vs->dev, VIRTIO_SCSI_F_HOTPLUG)) { | |
1346 | mutex_unlock(&vs->dev.mutex); | |
1347 | return; | |
1348 | } | |
1349 | ||
1350 | if (plug) | |
1351 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1352 | else | |
1353 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1354 | ||
3ab2e420 | 1355 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
1356 | mutex_lock(&vq->mutex); |
1357 | tcm_vhost_send_evt(vs, tpg, lun, | |
1358 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); | |
1359 | mutex_unlock(&vq->mutex); | |
1360 | mutex_unlock(&vs->dev.mutex); | |
1361 | } | |
1362 | ||
1363 | static void tcm_vhost_hotplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun) | |
1364 | { | |
1365 | tcm_vhost_do_plug(tpg, lun, true); | |
1366 | } | |
1367 | ||
1368 | static void tcm_vhost_hotunplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun) | |
1369 | { | |
1370 | tcm_vhost_do_plug(tpg, lun, false); | |
1371 | } | |
1372 | ||
101998f6 | 1373 | static int tcm_vhost_port_link(struct se_portal_group *se_tpg, |
057cbf49 NB |
1374 | struct se_lun *lun) |
1375 | { | |
1376 | struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg, | |
1377 | struct tcm_vhost_tpg, se_tpg); | |
1378 | ||
a6c9af87 AH |
1379 | mutex_lock(&tcm_vhost_mutex); |
1380 | ||
101998f6 NB |
1381 | mutex_lock(&tv_tpg->tv_tpg_mutex); |
1382 | tv_tpg->tv_tpg_port_count++; | |
1383 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
057cbf49 | 1384 | |
a6c9af87 AH |
1385 | tcm_vhost_hotplug(tv_tpg, lun); |
1386 | ||
1387 | mutex_unlock(&tcm_vhost_mutex); | |
1388 | ||
057cbf49 NB |
1389 | return 0; |
1390 | } | |
1391 | ||
101998f6 | 1392 | static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg, |
a6c9af87 | 1393 | struct se_lun *lun) |
057cbf49 NB |
1394 | { |
1395 | struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg, | |
1396 | struct tcm_vhost_tpg, se_tpg); | |
1397 | ||
a6c9af87 AH |
1398 | mutex_lock(&tcm_vhost_mutex); |
1399 | ||
101998f6 NB |
1400 | mutex_lock(&tv_tpg->tv_tpg_mutex); |
1401 | tv_tpg->tv_tpg_port_count--; | |
1402 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
a6c9af87 AH |
1403 | |
1404 | tcm_vhost_hotunplug(tv_tpg, lun); | |
1405 | ||
1406 | mutex_unlock(&tcm_vhost_mutex); | |
057cbf49 NB |
1407 | } |
1408 | ||
1409 | static struct se_node_acl *tcm_vhost_make_nodeacl( | |
1410 | struct se_portal_group *se_tpg, | |
1411 | struct config_group *group, | |
1412 | const char *name) | |
1413 | { | |
1414 | struct se_node_acl *se_nacl, *se_nacl_new; | |
1415 | struct tcm_vhost_nacl *nacl; | |
1416 | u64 wwpn = 0; | |
1417 | u32 nexus_depth; | |
1418 | ||
1419 | /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0) | |
1420 | return ERR_PTR(-EINVAL); */ | |
1421 | se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg); | |
1422 | if (!se_nacl_new) | |
1423 | return ERR_PTR(-ENOMEM); | |
1424 | ||
1425 | nexus_depth = 1; | |
1426 | /* | |
1427 | * se_nacl_new may be released by core_tpg_add_initiator_node_acl() | |
1428 | * when converting a NodeACL from demo mode -> explict | |
1429 | */ | |
1430 | se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new, | |
1431 | name, nexus_depth); | |
1432 | if (IS_ERR(se_nacl)) { | |
1433 | tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new); | |
1434 | return se_nacl; | |
1435 | } | |
1436 | /* | |
1437 | * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN | |
1438 | */ | |
1439 | nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl); | |
1440 | nacl->iport_wwpn = wwpn; | |
1441 | ||
1442 | return se_nacl; | |
1443 | } | |
1444 | ||
1445 | static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl) | |
1446 | { | |
1447 | struct tcm_vhost_nacl *nacl = container_of(se_acl, | |
1448 | struct tcm_vhost_nacl, se_node_acl); | |
1449 | core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1); | |
1450 | kfree(nacl); | |
1451 | } | |
1452 | ||
101998f6 | 1453 | static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tv_tpg, |
057cbf49 NB |
1454 | const char *name) |
1455 | { | |
1456 | struct se_portal_group *se_tpg; | |
1457 | struct tcm_vhost_nexus *tv_nexus; | |
1458 | ||
1459 | mutex_lock(&tv_tpg->tv_tpg_mutex); | |
1460 | if (tv_tpg->tpg_nexus) { | |
1461 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1462 | pr_debug("tv_tpg->tpg_nexus already exists\n"); | |
1463 | return -EEXIST; | |
1464 | } | |
1465 | se_tpg = &tv_tpg->se_tpg; | |
1466 | ||
1467 | tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL); | |
1468 | if (!tv_nexus) { | |
1469 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1470 | pr_err("Unable to allocate struct tcm_vhost_nexus\n"); | |
1471 | return -ENOMEM; | |
1472 | } | |
1473 | /* | |
1474 | * Initialize the struct se_session pointer | |
1475 | */ | |
1476 | tv_nexus->tvn_se_sess = transport_init_session(); | |
1477 | if (IS_ERR(tv_nexus->tvn_se_sess)) { | |
1478 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1479 | kfree(tv_nexus); | |
1480 | return -ENOMEM; | |
1481 | } | |
1482 | /* | |
1483 | * Since we are running in 'demo mode' this call with generate a | |
1484 | * struct se_node_acl for the tcm_vhost struct se_portal_group with | |
1485 | * the SCSI Initiator port name of the passed configfs group 'name'. | |
1486 | */ | |
1487 | tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
1488 | se_tpg, (unsigned char *)name); | |
1489 | if (!tv_nexus->tvn_se_sess->se_node_acl) { | |
1490 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1491 | pr_debug("core_tpg_check_initiator_node_acl() failed" | |
1492 | " for %s\n", name); | |
1493 | transport_free_session(tv_nexus->tvn_se_sess); | |
1494 | kfree(tv_nexus); | |
1495 | return -ENOMEM; | |
1496 | } | |
1497 | /* | |
101998f6 | 1498 | * Now register the TCM vhost virtual I_T Nexus as active with the |
057cbf49 NB |
1499 | * call to __transport_register_session() |
1500 | */ | |
1501 | __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl, | |
1502 | tv_nexus->tvn_se_sess, tv_nexus); | |
1503 | tv_tpg->tpg_nexus = tv_nexus; | |
1504 | ||
1505 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1506 | return 0; | |
1507 | } | |
1508 | ||
101998f6 | 1509 | static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg *tpg) |
057cbf49 NB |
1510 | { |
1511 | struct se_session *se_sess; | |
1512 | struct tcm_vhost_nexus *tv_nexus; | |
1513 | ||
1514 | mutex_lock(&tpg->tv_tpg_mutex); | |
1515 | tv_nexus = tpg->tpg_nexus; | |
1516 | if (!tv_nexus) { | |
1517 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1518 | return -ENODEV; | |
1519 | } | |
1520 | ||
1521 | se_sess = tv_nexus->tvn_se_sess; | |
1522 | if (!se_sess) { | |
1523 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1524 | return -ENODEV; | |
1525 | } | |
1526 | ||
101998f6 | 1527 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 1528 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1529 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1530 | " active TPG port count: %d\n", |
101998f6 NB |
1531 | tpg->tv_tpg_port_count); |
1532 | return -EBUSY; | |
057cbf49 NB |
1533 | } |
1534 | ||
101998f6 | 1535 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 1536 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1537 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1538 | " active TPG vhost count: %d\n", |
101998f6 NB |
1539 | tpg->tv_tpg_vhost_count); |
1540 | return -EBUSY; | |
057cbf49 NB |
1541 | } |
1542 | ||
101998f6 | 1543 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
057cbf49 NB |
1544 | " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport), |
1545 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
1546 | /* | |
101998f6 | 1547 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 NB |
1548 | */ |
1549 | transport_deregister_session(tv_nexus->tvn_se_sess); | |
1550 | tpg->tpg_nexus = NULL; | |
1551 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1552 | ||
1553 | kfree(tv_nexus); | |
1554 | return 0; | |
1555 | } | |
1556 | ||
101998f6 | 1557 | static ssize_t tcm_vhost_tpg_show_nexus(struct se_portal_group *se_tpg, |
057cbf49 NB |
1558 | char *page) |
1559 | { | |
1560 | struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg, | |
1561 | struct tcm_vhost_tpg, se_tpg); | |
1562 | struct tcm_vhost_nexus *tv_nexus; | |
1563 | ssize_t ret; | |
1564 | ||
1565 | mutex_lock(&tv_tpg->tv_tpg_mutex); | |
1566 | tv_nexus = tv_tpg->tpg_nexus; | |
1567 | if (!tv_nexus) { | |
1568 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1569 | return -ENODEV; | |
1570 | } | |
1571 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1572 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
1573 | mutex_unlock(&tv_tpg->tv_tpg_mutex); | |
1574 | ||
1575 | return ret; | |
1576 | } | |
1577 | ||
101998f6 | 1578 | static ssize_t tcm_vhost_tpg_store_nexus(struct se_portal_group *se_tpg, |
057cbf49 NB |
1579 | const char *page, |
1580 | size_t count) | |
1581 | { | |
1582 | struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg, | |
1583 | struct tcm_vhost_tpg, se_tpg); | |
1584 | struct tcm_vhost_tport *tport_wwn = tv_tpg->tport; | |
1585 | unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr; | |
1586 | int ret; | |
1587 | /* | |
1588 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
1589 | */ | |
1590 | if (!strncmp(page, "NULL", 4)) { | |
1591 | ret = tcm_vhost_drop_nexus(tv_tpg); | |
1592 | return (!ret) ? count : ret; | |
1593 | } | |
1594 | /* | |
1595 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1596 | * the fabric protocol_id set in tcm_vhost_make_tport(), and call | |
1597 | * tcm_vhost_make_nexus(). | |
1598 | */ | |
1599 | if (strlen(page) >= TCM_VHOST_NAMELEN) { | |
1600 | pr_err("Emulated NAA Sas Address: %s, exceeds" | |
1601 | " max: %d\n", page, TCM_VHOST_NAMELEN); | |
1602 | return -EINVAL; | |
1603 | } | |
1604 | snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page); | |
1605 | ||
1606 | ptr = strstr(i_port, "naa."); | |
1607 | if (ptr) { | |
1608 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
1609 | pr_err("Passed SAS Initiator Port %s does not" | |
1610 | " match target port protoid: %s\n", i_port, | |
1611 | tcm_vhost_dump_proto_id(tport_wwn)); | |
1612 | return -EINVAL; | |
1613 | } | |
1614 | port_ptr = &i_port[0]; | |
1615 | goto check_newline; | |
1616 | } | |
1617 | ptr = strstr(i_port, "fc."); | |
1618 | if (ptr) { | |
1619 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
1620 | pr_err("Passed FCP Initiator Port %s does not" | |
1621 | " match target port protoid: %s\n", i_port, | |
1622 | tcm_vhost_dump_proto_id(tport_wwn)); | |
1623 | return -EINVAL; | |
1624 | } | |
1625 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1626 | goto check_newline; | |
1627 | } | |
1628 | ptr = strstr(i_port, "iqn."); | |
1629 | if (ptr) { | |
1630 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
1631 | pr_err("Passed iSCSI Initiator Port %s does not" | |
1632 | " match target port protoid: %s\n", i_port, | |
1633 | tcm_vhost_dump_proto_id(tport_wwn)); | |
1634 | return -EINVAL; | |
1635 | } | |
1636 | port_ptr = &i_port[0]; | |
1637 | goto check_newline; | |
1638 | } | |
1639 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
1640 | " %s\n", i_port); | |
1641 | return -EINVAL; | |
1642 | /* | |
1643 | * Clear any trailing newline for the NAA WWN | |
1644 | */ | |
1645 | check_newline: | |
1646 | if (i_port[strlen(i_port)-1] == '\n') | |
1647 | i_port[strlen(i_port)-1] = '\0'; | |
1648 | ||
1649 | ret = tcm_vhost_make_nexus(tv_tpg, port_ptr); | |
1650 | if (ret < 0) | |
1651 | return ret; | |
1652 | ||
1653 | return count; | |
1654 | } | |
1655 | ||
1656 | TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR); | |
1657 | ||
1658 | static struct configfs_attribute *tcm_vhost_tpg_attrs[] = { | |
1659 | &tcm_vhost_tpg_nexus.attr, | |
1660 | NULL, | |
1661 | }; | |
1662 | ||
101998f6 | 1663 | static struct se_portal_group *tcm_vhost_make_tpg(struct se_wwn *wwn, |
057cbf49 NB |
1664 | struct config_group *group, |
1665 | const char *name) | |
1666 | { | |
1667 | struct tcm_vhost_tport *tport = container_of(wwn, | |
1668 | struct tcm_vhost_tport, tport_wwn); | |
1669 | ||
1670 | struct tcm_vhost_tpg *tpg; | |
1671 | unsigned long tpgt; | |
1672 | int ret; | |
1673 | ||
1674 | if (strstr(name, "tpgt_") != name) | |
1675 | return ERR_PTR(-EINVAL); | |
1676 | if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX) | |
1677 | return ERR_PTR(-EINVAL); | |
1678 | ||
1679 | tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL); | |
1680 | if (!tpg) { | |
1681 | pr_err("Unable to allocate struct tcm_vhost_tpg"); | |
1682 | return ERR_PTR(-ENOMEM); | |
1683 | } | |
1684 | mutex_init(&tpg->tv_tpg_mutex); | |
1685 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
1686 | tpg->tport = tport; | |
1687 | tpg->tport_tpgt = tpgt; | |
1688 | ||
1689 | ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn, | |
1690 | &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL); | |
1691 | if (ret < 0) { | |
1692 | kfree(tpg); | |
1693 | return NULL; | |
1694 | } | |
1695 | mutex_lock(&tcm_vhost_mutex); | |
1696 | list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list); | |
1697 | mutex_unlock(&tcm_vhost_mutex); | |
1698 | ||
1699 | return &tpg->se_tpg; | |
1700 | } | |
1701 | ||
1702 | static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg) | |
1703 | { | |
1704 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
1705 | struct tcm_vhost_tpg, se_tpg); | |
1706 | ||
1707 | mutex_lock(&tcm_vhost_mutex); | |
1708 | list_del(&tpg->tv_tpg_list); | |
1709 | mutex_unlock(&tcm_vhost_mutex); | |
1710 | /* | |
101998f6 | 1711 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 NB |
1712 | */ |
1713 | tcm_vhost_drop_nexus(tpg); | |
1714 | /* | |
1715 | * Deregister the se_tpg from TCM.. | |
1716 | */ | |
1717 | core_tpg_deregister(se_tpg); | |
1718 | kfree(tpg); | |
1719 | } | |
1720 | ||
101998f6 | 1721 | static struct se_wwn *tcm_vhost_make_tport(struct target_fabric_configfs *tf, |
057cbf49 NB |
1722 | struct config_group *group, |
1723 | const char *name) | |
1724 | { | |
1725 | struct tcm_vhost_tport *tport; | |
1726 | char *ptr; | |
1727 | u64 wwpn = 0; | |
1728 | int off = 0; | |
1729 | ||
1730 | /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0) | |
1731 | return ERR_PTR(-EINVAL); */ | |
1732 | ||
1733 | tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL); | |
1734 | if (!tport) { | |
1735 | pr_err("Unable to allocate struct tcm_vhost_tport"); | |
1736 | return ERR_PTR(-ENOMEM); | |
1737 | } | |
1738 | tport->tport_wwpn = wwpn; | |
1739 | /* | |
1740 | * Determine the emulated Protocol Identifier and Target Port Name | |
1741 | * based on the incoming configfs directory name. | |
1742 | */ | |
1743 | ptr = strstr(name, "naa."); | |
1744 | if (ptr) { | |
1745 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
1746 | goto check_len; | |
1747 | } | |
1748 | ptr = strstr(name, "fc."); | |
1749 | if (ptr) { | |
1750 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
1751 | off = 3; /* Skip over "fc." */ | |
1752 | goto check_len; | |
1753 | } | |
1754 | ptr = strstr(name, "iqn."); | |
1755 | if (ptr) { | |
1756 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
1757 | goto check_len; | |
1758 | } | |
1759 | ||
1760 | pr_err("Unable to locate prefix for emulated Target Port:" | |
1761 | " %s\n", name); | |
1762 | kfree(tport); | |
1763 | return ERR_PTR(-EINVAL); | |
1764 | ||
1765 | check_len: | |
1766 | if (strlen(name) >= TCM_VHOST_NAMELEN) { | |
1767 | pr_err("Emulated %s Address: %s, exceeds" | |
1768 | " max: %d\n", name, tcm_vhost_dump_proto_id(tport), | |
1769 | TCM_VHOST_NAMELEN); | |
1770 | kfree(tport); | |
1771 | return ERR_PTR(-EINVAL); | |
1772 | } | |
1773 | snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]); | |
1774 | ||
1775 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
1776 | " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name); | |
1777 | ||
1778 | return &tport->tport_wwn; | |
1779 | } | |
1780 | ||
1781 | static void tcm_vhost_drop_tport(struct se_wwn *wwn) | |
1782 | { | |
1783 | struct tcm_vhost_tport *tport = container_of(wwn, | |
1784 | struct tcm_vhost_tport, tport_wwn); | |
1785 | ||
1786 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
1787 | " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), | |
1788 | tport->tport_name); | |
1789 | ||
1790 | kfree(tport); | |
1791 | } | |
1792 | ||
1793 | static ssize_t tcm_vhost_wwn_show_attr_version( | |
1794 | struct target_fabric_configfs *tf, | |
1795 | char *page) | |
1796 | { | |
1797 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" | |
1798 | "on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname, | |
1799 | utsname()->machine); | |
1800 | } | |
1801 | ||
1802 | TF_WWN_ATTR_RO(tcm_vhost, version); | |
1803 | ||
1804 | static struct configfs_attribute *tcm_vhost_wwn_attrs[] = { | |
1805 | &tcm_vhost_wwn_version.attr, | |
1806 | NULL, | |
1807 | }; | |
1808 | ||
1809 | static struct target_core_fabric_ops tcm_vhost_ops = { | |
1810 | .get_fabric_name = tcm_vhost_get_fabric_name, | |
1811 | .get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident, | |
1812 | .tpg_get_wwn = tcm_vhost_get_fabric_wwn, | |
1813 | .tpg_get_tag = tcm_vhost_get_tag, | |
1814 | .tpg_get_default_depth = tcm_vhost_get_default_depth, | |
1815 | .tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id, | |
1816 | .tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len, | |
1817 | .tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id, | |
1818 | .tpg_check_demo_mode = tcm_vhost_check_true, | |
1819 | .tpg_check_demo_mode_cache = tcm_vhost_check_true, | |
1820 | .tpg_check_demo_mode_write_protect = tcm_vhost_check_false, | |
1821 | .tpg_check_prod_mode_write_protect = tcm_vhost_check_false, | |
1822 | .tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl, | |
1823 | .tpg_release_fabric_acl = tcm_vhost_release_fabric_acl, | |
1824 | .tpg_get_inst_index = tcm_vhost_tpg_get_inst_index, | |
1825 | .release_cmd = tcm_vhost_release_cmd, | |
1826 | .shutdown_session = tcm_vhost_shutdown_session, | |
1827 | .close_session = tcm_vhost_close_session, | |
1828 | .sess_get_index = tcm_vhost_sess_get_index, | |
1829 | .sess_get_initiator_sid = NULL, | |
1830 | .write_pending = tcm_vhost_write_pending, | |
1831 | .write_pending_status = tcm_vhost_write_pending_status, | |
1832 | .set_default_node_attributes = tcm_vhost_set_default_node_attrs, | |
1833 | .get_task_tag = tcm_vhost_get_task_tag, | |
1834 | .get_cmd_state = tcm_vhost_get_cmd_state, | |
1835 | .queue_data_in = tcm_vhost_queue_data_in, | |
1836 | .queue_status = tcm_vhost_queue_status, | |
1837 | .queue_tm_rsp = tcm_vhost_queue_tm_rsp, | |
057cbf49 NB |
1838 | /* |
1839 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
1840 | */ | |
1841 | .fabric_make_wwn = tcm_vhost_make_tport, | |
1842 | .fabric_drop_wwn = tcm_vhost_drop_tport, | |
1843 | .fabric_make_tpg = tcm_vhost_make_tpg, | |
1844 | .fabric_drop_tpg = tcm_vhost_drop_tpg, | |
1845 | .fabric_post_link = tcm_vhost_port_link, | |
1846 | .fabric_pre_unlink = tcm_vhost_port_unlink, | |
1847 | .fabric_make_np = NULL, | |
1848 | .fabric_drop_np = NULL, | |
1849 | .fabric_make_nodeacl = tcm_vhost_make_nodeacl, | |
1850 | .fabric_drop_nodeacl = tcm_vhost_drop_nodeacl, | |
1851 | }; | |
1852 | ||
1853 | static int tcm_vhost_register_configfs(void) | |
1854 | { | |
1855 | struct target_fabric_configfs *fabric; | |
1856 | int ret; | |
1857 | ||
1858 | pr_debug("TCM_VHOST fabric module %s on %s/%s" | |
1859 | " on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname, | |
1860 | utsname()->machine); | |
1861 | /* | |
1862 | * Register the top level struct config_item_type with TCM core | |
1863 | */ | |
1864 | fabric = target_fabric_configfs_init(THIS_MODULE, "vhost"); | |
1865 | if (IS_ERR(fabric)) { | |
1866 | pr_err("target_fabric_configfs_init() failed\n"); | |
1867 | return PTR_ERR(fabric); | |
1868 | } | |
1869 | /* | |
1870 | * Setup fabric->tf_ops from our local tcm_vhost_ops | |
1871 | */ | |
1872 | fabric->tf_ops = tcm_vhost_ops; | |
1873 | /* | |
1874 | * Setup default attribute lists for various fabric->tf_cit_tmpl | |
1875 | */ | |
1876 | TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs; | |
1877 | TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs; | |
1878 | TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL; | |
1879 | TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL; | |
1880 | TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL; | |
1881 | TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL; | |
1882 | TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL; | |
1883 | TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL; | |
1884 | TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL; | |
1885 | /* | |
1886 | * Register the fabric for use within TCM | |
1887 | */ | |
1888 | ret = target_fabric_configfs_register(fabric); | |
1889 | if (ret < 0) { | |
1890 | pr_err("target_fabric_configfs_register() failed" | |
1891 | " for TCM_VHOST\n"); | |
1892 | return ret; | |
1893 | } | |
1894 | /* | |
1895 | * Setup our local pointer to *fabric | |
1896 | */ | |
1897 | tcm_vhost_fabric_configfs = fabric; | |
1898 | pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n"); | |
1899 | return 0; | |
1900 | }; | |
1901 | ||
1902 | static void tcm_vhost_deregister_configfs(void) | |
1903 | { | |
1904 | if (!tcm_vhost_fabric_configfs) | |
1905 | return; | |
1906 | ||
1907 | target_fabric_configfs_deregister(tcm_vhost_fabric_configfs); | |
1908 | tcm_vhost_fabric_configfs = NULL; | |
1909 | pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n"); | |
1910 | }; | |
1911 | ||
1912 | static int __init tcm_vhost_init(void) | |
1913 | { | |
1914 | int ret = -ENOMEM; | |
101998f6 NB |
1915 | /* |
1916 | * Use our own dedicated workqueue for submitting I/O into | |
1917 | * target core to avoid contention within system_wq. | |
1918 | */ | |
057cbf49 NB |
1919 | tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0); |
1920 | if (!tcm_vhost_workqueue) | |
1921 | goto out; | |
1922 | ||
1923 | ret = vhost_scsi_register(); | |
1924 | if (ret < 0) | |
1925 | goto out_destroy_workqueue; | |
1926 | ||
1927 | ret = tcm_vhost_register_configfs(); | |
1928 | if (ret < 0) | |
1929 | goto out_vhost_scsi_deregister; | |
1930 | ||
1931 | return 0; | |
1932 | ||
1933 | out_vhost_scsi_deregister: | |
1934 | vhost_scsi_deregister(); | |
1935 | out_destroy_workqueue: | |
1936 | destroy_workqueue(tcm_vhost_workqueue); | |
1937 | out: | |
1938 | return ret; | |
1939 | }; | |
1940 | ||
1941 | static void tcm_vhost_exit(void) | |
1942 | { | |
1943 | tcm_vhost_deregister_configfs(); | |
1944 | vhost_scsi_deregister(); | |
1945 | destroy_workqueue(tcm_vhost_workqueue); | |
1946 | }; | |
1947 | ||
1948 | MODULE_DESCRIPTION("TCM_VHOST series fabric driver"); | |
1949 | MODULE_LICENSE("GPL"); | |
1950 | module_init(tcm_vhost_init); | |
1951 | module_exit(tcm_vhost_exit); |