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057cbf49 NB |
1 | /******************************************************************************* |
2 | * Vhost kernel TCM fabric driver for virtio SCSI initiators | |
3 | * | |
4c76251e | 4 | * (C) Copyright 2010-2013 Datera, Inc. |
057cbf49 NB |
5 | * (C) Copyright 2010-2012 IBM Corp. |
6 | * | |
7 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. | |
8 | * | |
4c76251e | 9 | * Authors: Nicholas A. Bellinger <nab@daterainc.com> |
057cbf49 NB |
10 | * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | ****************************************************************************/ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/moduleparam.h> | |
26 | #include <generated/utsrelease.h> | |
27 | #include <linux/utsname.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/kthread.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/configfs.h> | |
34 | #include <linux/ctype.h> | |
35 | #include <linux/compat.h> | |
36 | #include <linux/eventfd.h> | |
057cbf49 NB |
37 | #include <linux/fs.h> |
38 | #include <linux/miscdevice.h> | |
39 | #include <asm/unaligned.h> | |
40 | #include <scsi/scsi.h> | |
41 | #include <scsi/scsi_tcq.h> | |
42 | #include <target/target_core_base.h> | |
43 | #include <target/target_core_fabric.h> | |
44 | #include <target/target_core_fabric_configfs.h> | |
45 | #include <target/target_core_configfs.h> | |
46 | #include <target/configfs_macros.h> | |
47 | #include <linux/vhost.h> | |
057cbf49 | 48 | #include <linux/virtio_scsi.h> |
9d6064a3 | 49 | #include <linux/llist.h> |
1b7f390e | 50 | #include <linux/bitmap.h> |
4824d3bf | 51 | #include <linux/percpu_ida.h> |
057cbf49 | 52 | |
057cbf49 | 53 | #include "vhost.h" |
5012a3a3 MT |
54 | |
55 | #define TCM_VHOST_VERSION "v0.1" | |
56 | #define TCM_VHOST_NAMELEN 256 | |
57 | #define TCM_VHOST_MAX_CDB_SIZE 32 | |
4824d3bf | 58 | #define TCM_VHOST_DEFAULT_TAGS 256 |
3aee26b4 | 59 | #define TCM_VHOST_PREALLOC_SGLS 2048 |
5a01d082 | 60 | #define TCM_VHOST_PREALLOC_UPAGES 2048 |
b1935f68 | 61 | #define TCM_VHOST_PREALLOC_PROT_SGLS 512 |
5012a3a3 MT |
62 | |
63 | struct vhost_scsi_inflight { | |
64 | /* Wait for the flush operation to finish */ | |
65 | struct completion comp; | |
66 | /* Refcount for the inflight reqs */ | |
67 | struct kref kref; | |
68 | }; | |
69 | ||
70 | struct tcm_vhost_cmd { | |
71 | /* Descriptor from vhost_get_vq_desc() for virt_queue segment */ | |
72 | int tvc_vq_desc; | |
73 | /* virtio-scsi initiator task attribute */ | |
74 | int tvc_task_attr; | |
75 | /* virtio-scsi initiator data direction */ | |
76 | enum dma_data_direction tvc_data_direction; | |
77 | /* Expected data transfer length from virtio-scsi header */ | |
78 | u32 tvc_exp_data_len; | |
79 | /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */ | |
80 | u64 tvc_tag; | |
81 | /* The number of scatterlists associated with this cmd */ | |
82 | u32 tvc_sgl_count; | |
83 | /* Saved unpacked SCSI LUN for tcm_vhost_submission_work() */ | |
84 | u32 tvc_lun; | |
85 | /* Pointer to the SGL formatted memory from virtio-scsi */ | |
86 | struct scatterlist *tvc_sgl; | |
b1935f68 | 87 | struct scatterlist *tvc_prot_sgl; |
3aee26b4 | 88 | struct page **tvc_upages; |
5012a3a3 MT |
89 | /* Pointer to response */ |
90 | struct virtio_scsi_cmd_resp __user *tvc_resp; | |
91 | /* Pointer to vhost_scsi for our device */ | |
92 | struct vhost_scsi *tvc_vhost; | |
93 | /* Pointer to vhost_virtqueue for the cmd */ | |
94 | struct vhost_virtqueue *tvc_vq; | |
95 | /* Pointer to vhost nexus memory */ | |
96 | struct tcm_vhost_nexus *tvc_nexus; | |
97 | /* The TCM I/O descriptor that is accessed via container_of() */ | |
98 | struct se_cmd tvc_se_cmd; | |
99 | /* work item used for cmwq dispatch to tcm_vhost_submission_work() */ | |
100 | struct work_struct work; | |
101 | /* Copy of the incoming SCSI command descriptor block (CDB) */ | |
102 | unsigned char tvc_cdb[TCM_VHOST_MAX_CDB_SIZE]; | |
103 | /* Sense buffer that will be mapped into outgoing status */ | |
104 | unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER]; | |
105 | /* Completed commands list, serviced from vhost worker thread */ | |
106 | struct llist_node tvc_completion_list; | |
107 | /* Used to track inflight cmd */ | |
108 | struct vhost_scsi_inflight *inflight; | |
109 | }; | |
110 | ||
111 | struct tcm_vhost_nexus { | |
112 | /* Pointer to TCM session for I_T Nexus */ | |
113 | struct se_session *tvn_se_sess; | |
114 | }; | |
115 | ||
116 | struct tcm_vhost_nacl { | |
117 | /* Binary World Wide unique Port Name for Vhost Initiator port */ | |
118 | u64 iport_wwpn; | |
119 | /* ASCII formatted WWPN for Sas Initiator port */ | |
120 | char iport_name[TCM_VHOST_NAMELEN]; | |
121 | /* Returned by tcm_vhost_make_nodeacl() */ | |
122 | struct se_node_acl se_node_acl; | |
123 | }; | |
124 | ||
5012a3a3 MT |
125 | struct tcm_vhost_tpg { |
126 | /* Vhost port target portal group tag for TCM */ | |
127 | u16 tport_tpgt; | |
128 | /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */ | |
129 | int tv_tpg_port_count; | |
130 | /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */ | |
131 | int tv_tpg_vhost_count; | |
132 | /* list for tcm_vhost_list */ | |
133 | struct list_head tv_tpg_list; | |
134 | /* Used to protect access for tpg_nexus */ | |
135 | struct mutex tv_tpg_mutex; | |
136 | /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */ | |
137 | struct tcm_vhost_nexus *tpg_nexus; | |
138 | /* Pointer back to tcm_vhost_tport */ | |
139 | struct tcm_vhost_tport *tport; | |
140 | /* Returned by tcm_vhost_make_tpg() */ | |
141 | struct se_portal_group se_tpg; | |
142 | /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */ | |
143 | struct vhost_scsi *vhost_scsi; | |
144 | }; | |
145 | ||
146 | struct tcm_vhost_tport { | |
147 | /* SCSI protocol the tport is providing */ | |
148 | u8 tport_proto_id; | |
149 | /* Binary World Wide unique Port Name for Vhost Target port */ | |
150 | u64 tport_wwpn; | |
151 | /* ASCII formatted WWPN for Vhost Target port */ | |
152 | char tport_name[TCM_VHOST_NAMELEN]; | |
153 | /* Returned by tcm_vhost_make_tport() */ | |
154 | struct se_wwn tport_wwn; | |
155 | }; | |
156 | ||
157 | struct tcm_vhost_evt { | |
158 | /* event to be sent to guest */ | |
159 | struct virtio_scsi_event event; | |
160 | /* event list, serviced from vhost worker thread */ | |
161 | struct llist_node list; | |
162 | }; | |
057cbf49 | 163 | |
101998f6 NB |
164 | enum { |
165 | VHOST_SCSI_VQ_CTL = 0, | |
166 | VHOST_SCSI_VQ_EVT = 1, | |
167 | VHOST_SCSI_VQ_IO = 2, | |
168 | }; | |
169 | ||
5dade710 | 170 | enum { |
a18cc421 | 171 | VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
5dade710 NB |
172 | }; |
173 | ||
1b7f390e AH |
174 | #define VHOST_SCSI_MAX_TARGET 256 |
175 | #define VHOST_SCSI_MAX_VQ 128 | |
a6c9af87 | 176 | #define VHOST_SCSI_MAX_EVENT 128 |
67e18cf9 | 177 | |
3ab2e420 AH |
178 | struct vhost_scsi_virtqueue { |
179 | struct vhost_virtqueue vq; | |
3dfbff32 MT |
180 | /* |
181 | * Reference counting for inflight reqs, used for flush operation. At | |
182 | * each time, one reference tracks new commands submitted, while we | |
183 | * wait for another one to reach 0. | |
184 | */ | |
f2f0173d | 185 | struct vhost_scsi_inflight inflights[2]; |
3dfbff32 MT |
186 | /* |
187 | * Indicate current inflight in use, protected by vq->mutex. | |
188 | * Writers must also take dev mutex and flush under it. | |
189 | */ | |
f2f0173d | 190 | int inflight_idx; |
3ab2e420 AH |
191 | }; |
192 | ||
057cbf49 | 193 | struct vhost_scsi { |
67e18cf9 | 194 | /* Protected by vhost_scsi->dev.mutex */ |
4f7f46d3 | 195 | struct tcm_vhost_tpg **vs_tpg; |
67e18cf9 | 196 | char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
67e18cf9 | 197 | |
057cbf49 | 198 | struct vhost_dev dev; |
3ab2e420 | 199 | struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ]; |
057cbf49 NB |
200 | |
201 | struct vhost_work vs_completion_work; /* cmd completion work item */ | |
9d6064a3 | 202 | struct llist_head vs_completion_list; /* cmd completion queue */ |
a6c9af87 AH |
203 | |
204 | struct vhost_work vs_event_work; /* evt injection work item */ | |
205 | struct llist_head vs_event_list; /* evt injection queue */ | |
206 | ||
207 | bool vs_events_missed; /* any missed events, protected by vq->mutex */ | |
208 | int vs_events_nr; /* num of pending events, protected by vq->mutex */ | |
057cbf49 NB |
209 | }; |
210 | ||
211 | /* Local pointer to allocated TCM configfs fabric module */ | |
212 | static struct target_fabric_configfs *tcm_vhost_fabric_configfs; | |
213 | ||
214 | static struct workqueue_struct *tcm_vhost_workqueue; | |
215 | ||
216 | /* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */ | |
217 | static DEFINE_MUTEX(tcm_vhost_mutex); | |
218 | static LIST_HEAD(tcm_vhost_list); | |
219 | ||
765b34fd AH |
220 | static int iov_num_pages(struct iovec *iov) |
221 | { | |
222 | return (PAGE_ALIGN((unsigned long)iov->iov_base + iov->iov_len) - | |
223 | ((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT; | |
224 | } | |
225 | ||
0a1febf7 | 226 | static void tcm_vhost_done_inflight(struct kref *kref) |
f2f0173d AH |
227 | { |
228 | struct vhost_scsi_inflight *inflight; | |
229 | ||
230 | inflight = container_of(kref, struct vhost_scsi_inflight, kref); | |
231 | complete(&inflight->comp); | |
232 | } | |
233 | ||
234 | static void tcm_vhost_init_inflight(struct vhost_scsi *vs, | |
235 | struct vhost_scsi_inflight *old_inflight[]) | |
236 | { | |
237 | struct vhost_scsi_inflight *new_inflight; | |
238 | struct vhost_virtqueue *vq; | |
239 | int idx, i; | |
240 | ||
241 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
242 | vq = &vs->vqs[i].vq; | |
243 | ||
244 | mutex_lock(&vq->mutex); | |
245 | ||
246 | /* store old infight */ | |
247 | idx = vs->vqs[i].inflight_idx; | |
248 | if (old_inflight) | |
249 | old_inflight[i] = &vs->vqs[i].inflights[idx]; | |
250 | ||
251 | /* setup new infight */ | |
252 | vs->vqs[i].inflight_idx = idx ^ 1; | |
253 | new_inflight = &vs->vqs[i].inflights[idx ^ 1]; | |
254 | kref_init(&new_inflight->kref); | |
255 | init_completion(&new_inflight->comp); | |
256 | ||
257 | mutex_unlock(&vq->mutex); | |
258 | } | |
259 | } | |
260 | ||
261 | static struct vhost_scsi_inflight * | |
262 | tcm_vhost_get_inflight(struct vhost_virtqueue *vq) | |
263 | { | |
264 | struct vhost_scsi_inflight *inflight; | |
265 | struct vhost_scsi_virtqueue *svq; | |
266 | ||
267 | svq = container_of(vq, struct vhost_scsi_virtqueue, vq); | |
268 | inflight = &svq->inflights[svq->inflight_idx]; | |
269 | kref_get(&inflight->kref); | |
270 | ||
271 | return inflight; | |
272 | } | |
273 | ||
274 | static void tcm_vhost_put_inflight(struct vhost_scsi_inflight *inflight) | |
275 | { | |
276 | kref_put(&inflight->kref, tcm_vhost_done_inflight); | |
277 | } | |
278 | ||
057cbf49 NB |
279 | static int tcm_vhost_check_true(struct se_portal_group *se_tpg) |
280 | { | |
281 | return 1; | |
282 | } | |
283 | ||
284 | static int tcm_vhost_check_false(struct se_portal_group *se_tpg) | |
285 | { | |
286 | return 0; | |
287 | } | |
288 | ||
289 | static char *tcm_vhost_get_fabric_name(void) | |
290 | { | |
291 | return "vhost"; | |
292 | } | |
293 | ||
294 | static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg) | |
295 | { | |
296 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
297 | struct tcm_vhost_tpg, se_tpg); | |
298 | struct tcm_vhost_tport *tport = tpg->tport; | |
299 | ||
300 | switch (tport->tport_proto_id) { | |
301 | case SCSI_PROTOCOL_SAS: | |
302 | return sas_get_fabric_proto_ident(se_tpg); | |
303 | case SCSI_PROTOCOL_FCP: | |
304 | return fc_get_fabric_proto_ident(se_tpg); | |
305 | case SCSI_PROTOCOL_ISCSI: | |
306 | return iscsi_get_fabric_proto_ident(se_tpg); | |
307 | default: | |
308 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
309 | " SAS emulation\n", tport->tport_proto_id); | |
310 | break; | |
311 | } | |
312 | ||
313 | return sas_get_fabric_proto_ident(se_tpg); | |
314 | } | |
315 | ||
316 | static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg) | |
317 | { | |
318 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
319 | struct tcm_vhost_tpg, se_tpg); | |
320 | struct tcm_vhost_tport *tport = tpg->tport; | |
321 | ||
322 | return &tport->tport_name[0]; | |
323 | } | |
324 | ||
325 | static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg) | |
326 | { | |
327 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
328 | struct tcm_vhost_tpg, se_tpg); | |
329 | return tpg->tport_tpgt; | |
330 | } | |
331 | ||
332 | static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg) | |
333 | { | |
334 | return 1; | |
335 | } | |
336 | ||
683bd967 AH |
337 | static u32 |
338 | tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg, | |
339 | struct se_node_acl *se_nacl, | |
340 | struct t10_pr_registration *pr_reg, | |
341 | int *format_code, | |
342 | unsigned char *buf) | |
057cbf49 NB |
343 | { |
344 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
345 | struct tcm_vhost_tpg, se_tpg); | |
346 | struct tcm_vhost_tport *tport = tpg->tport; | |
347 | ||
348 | switch (tport->tport_proto_id) { | |
349 | case SCSI_PROTOCOL_SAS: | |
350 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
351 | format_code, buf); | |
352 | case SCSI_PROTOCOL_FCP: | |
353 | return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
354 | format_code, buf); | |
355 | case SCSI_PROTOCOL_ISCSI: | |
356 | return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
357 | format_code, buf); | |
358 | default: | |
359 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
360 | " SAS emulation\n", tport->tport_proto_id); | |
361 | break; | |
362 | } | |
363 | ||
364 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
365 | format_code, buf); | |
366 | } | |
367 | ||
683bd967 AH |
368 | static u32 |
369 | tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg, | |
370 | struct se_node_acl *se_nacl, | |
371 | struct t10_pr_registration *pr_reg, | |
372 | int *format_code) | |
057cbf49 NB |
373 | { |
374 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
375 | struct tcm_vhost_tpg, se_tpg); | |
376 | struct tcm_vhost_tport *tport = tpg->tport; | |
377 | ||
378 | switch (tport->tport_proto_id) { | |
379 | case SCSI_PROTOCOL_SAS: | |
380 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
381 | format_code); | |
382 | case SCSI_PROTOCOL_FCP: | |
383 | return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
384 | format_code); | |
385 | case SCSI_PROTOCOL_ISCSI: | |
386 | return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
387 | format_code); | |
388 | default: | |
389 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
390 | " SAS emulation\n", tport->tport_proto_id); | |
391 | break; | |
392 | } | |
393 | ||
394 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
395 | format_code); | |
396 | } | |
397 | ||
683bd967 AH |
398 | static char * |
399 | tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg, | |
400 | const char *buf, | |
401 | u32 *out_tid_len, | |
402 | char **port_nexus_ptr) | |
057cbf49 NB |
403 | { |
404 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
405 | struct tcm_vhost_tpg, se_tpg); | |
406 | struct tcm_vhost_tport *tport = tpg->tport; | |
407 | ||
408 | switch (tport->tport_proto_id) { | |
409 | case SCSI_PROTOCOL_SAS: | |
410 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
411 | port_nexus_ptr); | |
412 | case SCSI_PROTOCOL_FCP: | |
413 | return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
414 | port_nexus_ptr); | |
415 | case SCSI_PROTOCOL_ISCSI: | |
416 | return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
417 | port_nexus_ptr); | |
418 | default: | |
419 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
420 | " SAS emulation\n", tport->tport_proto_id); | |
421 | break; | |
422 | } | |
423 | ||
424 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
425 | port_nexus_ptr); | |
426 | } | |
427 | ||
683bd967 AH |
428 | static struct se_node_acl * |
429 | tcm_vhost_alloc_fabric_acl(struct se_portal_group *se_tpg) | |
057cbf49 NB |
430 | { |
431 | struct tcm_vhost_nacl *nacl; | |
432 | ||
433 | nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL); | |
434 | if (!nacl) { | |
744627e9 | 435 | pr_err("Unable to allocate struct tcm_vhost_nacl\n"); |
057cbf49 NB |
436 | return NULL; |
437 | } | |
438 | ||
439 | return &nacl->se_node_acl; | |
440 | } | |
441 | ||
683bd967 AH |
442 | static void |
443 | tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg, | |
444 | struct se_node_acl *se_nacl) | |
057cbf49 NB |
445 | { |
446 | struct tcm_vhost_nacl *nacl = container_of(se_nacl, | |
447 | struct tcm_vhost_nacl, se_node_acl); | |
448 | kfree(nacl); | |
449 | } | |
450 | ||
451 | static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg) | |
452 | { | |
453 | return 1; | |
454 | } | |
455 | ||
456 | static void tcm_vhost_release_cmd(struct se_cmd *se_cmd) | |
457 | { | |
084ed45b NB |
458 | struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd, |
459 | struct tcm_vhost_cmd, tvc_se_cmd); | |
4824d3bf | 460 | struct se_session *se_sess = se_cmd->se_sess; |
084ed45b NB |
461 | |
462 | if (tv_cmd->tvc_sgl_count) { | |
463 | u32 i; | |
464 | for (i = 0; i < tv_cmd->tvc_sgl_count; i++) | |
465 | put_page(sg_page(&tv_cmd->tvc_sgl[i])); | |
d3d665a6 | 466 | } |
084ed45b NB |
467 | |
468 | tcm_vhost_put_inflight(tv_cmd->inflight); | |
4824d3bf | 469 | percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag); |
057cbf49 NB |
470 | } |
471 | ||
472 | static int tcm_vhost_shutdown_session(struct se_session *se_sess) | |
473 | { | |
474 | return 0; | |
475 | } | |
476 | ||
477 | static void tcm_vhost_close_session(struct se_session *se_sess) | |
478 | { | |
479 | return; | |
480 | } | |
481 | ||
482 | static u32 tcm_vhost_sess_get_index(struct se_session *se_sess) | |
483 | { | |
484 | return 0; | |
485 | } | |
486 | ||
487 | static int tcm_vhost_write_pending(struct se_cmd *se_cmd) | |
488 | { | |
489 | /* Go ahead and process the write immediately */ | |
490 | target_execute_cmd(se_cmd); | |
491 | return 0; | |
492 | } | |
493 | ||
494 | static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd) | |
495 | { | |
496 | return 0; | |
497 | } | |
498 | ||
499 | static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl) | |
500 | { | |
501 | return; | |
502 | } | |
503 | ||
504 | static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd) | |
505 | { | |
506 | return 0; | |
507 | } | |
508 | ||
509 | static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd) | |
510 | { | |
511 | return 0; | |
512 | } | |
513 | ||
3c63f66a | 514 | static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *cmd) |
101998f6 | 515 | { |
3c63f66a | 516 | struct vhost_scsi *vs = cmd->tvc_vhost; |
101998f6 | 517 | |
3c63f66a | 518 | llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
101998f6 NB |
519 | |
520 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
521 | } | |
057cbf49 NB |
522 | |
523 | static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd) | |
524 | { | |
3c63f66a | 525 | struct tcm_vhost_cmd *cmd = container_of(se_cmd, |
057cbf49 | 526 | struct tcm_vhost_cmd, tvc_se_cmd); |
3c63f66a | 527 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
528 | return 0; |
529 | } | |
530 | ||
531 | static int tcm_vhost_queue_status(struct se_cmd *se_cmd) | |
532 | { | |
3c63f66a | 533 | struct tcm_vhost_cmd *cmd = container_of(se_cmd, |
057cbf49 | 534 | struct tcm_vhost_cmd, tvc_se_cmd); |
3c63f66a | 535 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
536 | return 0; |
537 | } | |
538 | ||
b79fafac | 539 | static void tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd) |
057cbf49 | 540 | { |
b79fafac | 541 | return; |
057cbf49 NB |
542 | } |
543 | ||
131e6abc NB |
544 | static void tcm_vhost_aborted_task(struct se_cmd *se_cmd) |
545 | { | |
546 | return; | |
547 | } | |
548 | ||
a6c9af87 AH |
549 | static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt) |
550 | { | |
551 | vs->vs_events_nr--; | |
552 | kfree(evt); | |
553 | } | |
554 | ||
683bd967 AH |
555 | static struct tcm_vhost_evt * |
556 | tcm_vhost_allocate_evt(struct vhost_scsi *vs, | |
557 | u32 event, u32 reason) | |
a6c9af87 | 558 | { |
3ab2e420 | 559 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
560 | struct tcm_vhost_evt *evt; |
561 | ||
562 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
563 | vs->vs_events_missed = true; | |
564 | return NULL; | |
565 | } | |
566 | ||
567 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
568 | if (!evt) { | |
569 | vq_err(vq, "Failed to allocate tcm_vhost_evt\n"); | |
570 | vs->vs_events_missed = true; | |
571 | return NULL; | |
572 | } | |
573 | ||
574 | evt->event.event = event; | |
575 | evt->event.reason = reason; | |
576 | vs->vs_events_nr++; | |
577 | ||
578 | return evt; | |
579 | } | |
580 | ||
3c63f66a | 581 | static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *cmd) |
057cbf49 | 582 | { |
3c63f66a | 583 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
584 | |
585 | /* TODO locking against target/backend threads? */ | |
6c131d0c | 586 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 587 | |
084ed45b | 588 | } |
f2f0173d | 589 | |
084ed45b NB |
590 | static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) |
591 | { | |
592 | return target_put_sess_cmd(se_cmd->se_sess, se_cmd); | |
057cbf49 NB |
593 | } |
594 | ||
683bd967 AH |
595 | static void |
596 | tcm_vhost_do_evt_work(struct vhost_scsi *vs, struct tcm_vhost_evt *evt) | |
a6c9af87 | 597 | { |
3ab2e420 | 598 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
599 | struct virtio_scsi_event *event = &evt->event; |
600 | struct virtio_scsi_event __user *eventp; | |
601 | unsigned out, in; | |
602 | int head, ret; | |
603 | ||
604 | if (!vq->private_data) { | |
605 | vs->vs_events_missed = true; | |
606 | return; | |
607 | } | |
608 | ||
609 | again: | |
610 | vhost_disable_notify(&vs->dev, vq); | |
611 | head = vhost_get_vq_desc(&vs->dev, vq, vq->iov, | |
612 | ARRAY_SIZE(vq->iov), &out, &in, | |
613 | NULL, NULL); | |
614 | if (head < 0) { | |
615 | vs->vs_events_missed = true; | |
616 | return; | |
617 | } | |
618 | if (head == vq->num) { | |
619 | if (vhost_enable_notify(&vs->dev, vq)) | |
620 | goto again; | |
621 | vs->vs_events_missed = true; | |
622 | return; | |
623 | } | |
624 | ||
625 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { | |
626 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", | |
627 | vq->iov[out].iov_len); | |
628 | vs->vs_events_missed = true; | |
629 | return; | |
630 | } | |
631 | ||
632 | if (vs->vs_events_missed) { | |
633 | event->event |= VIRTIO_SCSI_T_EVENTS_MISSED; | |
634 | vs->vs_events_missed = false; | |
635 | } | |
636 | ||
637 | eventp = vq->iov[out].iov_base; | |
638 | ret = __copy_to_user(eventp, event, sizeof(*event)); | |
639 | if (!ret) | |
640 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
641 | else | |
642 | vq_err(vq, "Faulted on tcm_vhost_send_event\n"); | |
643 | } | |
644 | ||
645 | static void tcm_vhost_evt_work(struct vhost_work *work) | |
646 | { | |
647 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
648 | vs_event_work); | |
3ab2e420 | 649 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
650 | struct tcm_vhost_evt *evt; |
651 | struct llist_node *llnode; | |
652 | ||
653 | mutex_lock(&vq->mutex); | |
654 | llnode = llist_del_all(&vs->vs_event_list); | |
655 | while (llnode) { | |
656 | evt = llist_entry(llnode, struct tcm_vhost_evt, list); | |
657 | llnode = llist_next(llnode); | |
658 | tcm_vhost_do_evt_work(vs, evt); | |
659 | tcm_vhost_free_evt(vs, evt); | |
660 | } | |
661 | mutex_unlock(&vq->mutex); | |
662 | } | |
663 | ||
057cbf49 NB |
664 | /* Fill in status and signal that we are done processing this command |
665 | * | |
666 | * This is scheduled in the vhost work queue so we are called with the owner | |
667 | * process mm and can access the vring. | |
668 | */ | |
669 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) | |
670 | { | |
671 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
672 | vs_completion_work); | |
1b7f390e | 673 | DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 674 | struct virtio_scsi_cmd_resp v_rsp; |
3c63f66a | 675 | struct tcm_vhost_cmd *cmd; |
9d6064a3 AH |
676 | struct llist_node *llnode; |
677 | struct se_cmd *se_cmd; | |
1b7f390e | 678 | int ret, vq; |
057cbf49 | 679 | |
1b7f390e | 680 | bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 AH |
681 | llnode = llist_del_all(&vs->vs_completion_list); |
682 | while (llnode) { | |
3c63f66a | 683 | cmd = llist_entry(llnode, struct tcm_vhost_cmd, |
9d6064a3 AH |
684 | tvc_completion_list); |
685 | llnode = llist_next(llnode); | |
3c63f66a | 686 | se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
687 | |
688 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
3c63f66a | 689 | cmd, se_cmd->residual_count, se_cmd->scsi_status); |
057cbf49 NB |
690 | |
691 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
692 | v_rsp.resid = se_cmd->residual_count; | |
693 | /* TODO is status_qualifier field needed? */ | |
694 | v_rsp.status = se_cmd->scsi_status; | |
695 | v_rsp.sense_len = se_cmd->scsi_sense_length; | |
3c63f66a | 696 | memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
057cbf49 | 697 | v_rsp.sense_len); |
3c63f66a | 698 | ret = copy_to_user(cmd->tvc_resp, &v_rsp, sizeof(v_rsp)); |
1b7f390e | 699 | if (likely(ret == 0)) { |
3ab2e420 | 700 | struct vhost_scsi_virtqueue *q; |
3c63f66a AH |
701 | vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
702 | q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); | |
3ab2e420 | 703 | vq = q - vs->vqs; |
1b7f390e AH |
704 | __set_bit(vq, signal); |
705 | } else | |
057cbf49 NB |
706 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
707 | ||
3c63f66a | 708 | vhost_scsi_free_cmd(cmd); |
057cbf49 NB |
709 | } |
710 | ||
1b7f390e AH |
711 | vq = -1; |
712 | while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) | |
713 | < VHOST_SCSI_MAX_VQ) | |
3ab2e420 | 714 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
715 | } |
716 | ||
683bd967 | 717 | static struct tcm_vhost_cmd * |
4824d3bf | 718 | vhost_scsi_get_tag(struct vhost_virtqueue *vq, |
98718312 | 719 | struct tcm_vhost_tpg *tpg, |
683bd967 AH |
720 | struct virtio_scsi_cmd_req *v_req, |
721 | u32 exp_data_len, | |
722 | int data_direction) | |
057cbf49 | 723 | { |
3c63f66a | 724 | struct tcm_vhost_cmd *cmd; |
057cbf49 | 725 | struct tcm_vhost_nexus *tv_nexus; |
4824d3bf | 726 | struct se_session *se_sess; |
b1935f68 | 727 | struct scatterlist *sg, *prot_sg; |
3aee26b4 | 728 | struct page **pages; |
4824d3bf | 729 | int tag; |
057cbf49 | 730 | |
98718312 | 731 | tv_nexus = tpg->tpg_nexus; |
057cbf49 NB |
732 | if (!tv_nexus) { |
733 | pr_err("Unable to locate active struct tcm_vhost_nexus\n"); | |
734 | return ERR_PTR(-EIO); | |
735 | } | |
4824d3bf | 736 | se_sess = tv_nexus->tvn_se_sess; |
057cbf49 | 737 | |
6f6b5d1e | 738 | tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING); |
4a47d3a1 NB |
739 | if (tag < 0) { |
740 | pr_err("Unable to obtain tag for tcm_vhost_cmd\n"); | |
741 | return ERR_PTR(-ENOMEM); | |
742 | } | |
743 | ||
4824d3bf | 744 | cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[tag]; |
3aee26b4 | 745 | sg = cmd->tvc_sgl; |
b1935f68 | 746 | prot_sg = cmd->tvc_prot_sgl; |
3aee26b4 | 747 | pages = cmd->tvc_upages; |
4824d3bf NB |
748 | memset(cmd, 0, sizeof(struct tcm_vhost_cmd)); |
749 | ||
3aee26b4 | 750 | cmd->tvc_sgl = sg; |
b1935f68 | 751 | cmd->tvc_prot_sgl = prot_sg; |
3aee26b4 | 752 | cmd->tvc_upages = pages; |
4824d3bf | 753 | cmd->tvc_se_cmd.map_tag = tag; |
3c63f66a AH |
754 | cmd->tvc_tag = v_req->tag; |
755 | cmd->tvc_task_attr = v_req->task_attr; | |
756 | cmd->tvc_exp_data_len = exp_data_len; | |
757 | cmd->tvc_data_direction = data_direction; | |
758 | cmd->tvc_nexus = tv_nexus; | |
759 | cmd->inflight = tcm_vhost_get_inflight(vq); | |
760 | ||
761 | return cmd; | |
057cbf49 NB |
762 | } |
763 | ||
764 | /* | |
765 | * Map a user memory range into a scatterlist | |
766 | * | |
767 | * Returns the number of scatterlist entries used or -errno on error. | |
768 | */ | |
683bd967 | 769 | static int |
3aee26b4 NB |
770 | vhost_scsi_map_to_sgl(struct tcm_vhost_cmd *tv_cmd, |
771 | struct scatterlist *sgl, | |
683bd967 AH |
772 | unsigned int sgl_count, |
773 | struct iovec *iov, | |
5a01d082 NB |
774 | struct page **pages, |
775 | bool write) | |
057cbf49 | 776 | { |
1810053e | 777 | unsigned int npages = 0, pages_nr, offset, nbytes; |
057cbf49 | 778 | struct scatterlist *sg = sgl; |
1810053e AH |
779 | void __user *ptr = iov->iov_base; |
780 | size_t len = iov->iov_len; | |
1810053e | 781 | int ret, i; |
057cbf49 | 782 | |
1810053e | 783 | pages_nr = iov_num_pages(iov); |
5a01d082 NB |
784 | if (pages_nr > sgl_count) { |
785 | pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than" | |
786 | " sgl_count: %u\n", pages_nr, sgl_count); | |
1810053e | 787 | return -ENOBUFS; |
5a01d082 NB |
788 | } |
789 | if (pages_nr > TCM_VHOST_PREALLOC_UPAGES) { | |
3aee26b4 | 790 | pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than" |
5a01d082 NB |
791 | " preallocated TCM_VHOST_PREALLOC_UPAGES: %u\n", |
792 | pages_nr, TCM_VHOST_PREALLOC_UPAGES); | |
3aee26b4 NB |
793 | return -ENOBUFS; |
794 | } | |
795 | ||
1810053e AH |
796 | ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages); |
797 | /* No pages were pinned */ | |
798 | if (ret < 0) | |
799 | goto out; | |
800 | /* Less pages pinned than wanted */ | |
801 | if (ret != pages_nr) { | |
802 | for (i = 0; i < ret; i++) | |
803 | put_page(pages[i]); | |
804 | ret = -EFAULT; | |
805 | goto out; | |
806 | } | |
807 | ||
808 | while (len > 0) { | |
809 | offset = (uintptr_t)ptr & ~PAGE_MASK; | |
810 | nbytes = min_t(unsigned int, PAGE_SIZE - offset, len); | |
811 | sg_set_page(sg, pages[npages], nbytes, offset); | |
057cbf49 NB |
812 | ptr += nbytes; |
813 | len -= nbytes; | |
814 | sg++; | |
815 | npages++; | |
816 | } | |
057cbf49 | 817 | |
1810053e | 818 | out: |
057cbf49 NB |
819 | return ret; |
820 | } | |
821 | ||
683bd967 | 822 | static int |
3c63f66a | 823 | vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *cmd, |
683bd967 | 824 | struct iovec *iov, |
5a01d082 NB |
825 | int niov, |
826 | bool write) | |
057cbf49 | 827 | { |
5a01d082 NB |
828 | struct scatterlist *sg = cmd->tvc_sgl; |
829 | unsigned int sgl_count = 0; | |
830 | int ret, i; | |
057cbf49 | 831 | |
f3158f36 AH |
832 | for (i = 0; i < niov; i++) |
833 | sgl_count += iov_num_pages(&iov[i]); | |
834 | ||
5a01d082 NB |
835 | if (sgl_count > TCM_VHOST_PREALLOC_SGLS) { |
836 | pr_err("vhost_scsi_map_iov_to_sgl() sgl_count: %u greater than" | |
837 | " preallocated TCM_VHOST_PREALLOC_SGLS: %u\n", | |
838 | sgl_count, TCM_VHOST_PREALLOC_SGLS); | |
839 | return -ENOBUFS; | |
840 | } | |
057cbf49 | 841 | |
3aee26b4 | 842 | pr_debug("%s sg %p sgl_count %u\n", __func__, sg, sgl_count); |
057cbf49 | 843 | sg_init_table(sg, sgl_count); |
3c63f66a | 844 | cmd->tvc_sgl_count = sgl_count; |
057cbf49 | 845 | |
5a01d082 NB |
846 | pr_debug("Mapping iovec %p for %u pages\n", &iov[0], sgl_count); |
847 | ||
057cbf49 | 848 | for (i = 0; i < niov; i++) { |
3aee26b4 | 849 | ret = vhost_scsi_map_to_sgl(cmd, sg, sgl_count, &iov[i], |
5a01d082 | 850 | cmd->tvc_upages, write); |
057cbf49 | 851 | if (ret < 0) { |
3c63f66a AH |
852 | for (i = 0; i < cmd->tvc_sgl_count; i++) |
853 | put_page(sg_page(&cmd->tvc_sgl[i])); | |
3aee26b4 | 854 | |
3c63f66a | 855 | cmd->tvc_sgl_count = 0; |
057cbf49 NB |
856 | return ret; |
857 | } | |
057cbf49 NB |
858 | sg += ret; |
859 | sgl_count -= ret; | |
860 | } | |
861 | return 0; | |
862 | } | |
863 | ||
864 | static void tcm_vhost_submission_work(struct work_struct *work) | |
865 | { | |
3c63f66a | 866 | struct tcm_vhost_cmd *cmd = |
057cbf49 | 867 | container_of(work, struct tcm_vhost_cmd, work); |
9f0abc15 | 868 | struct tcm_vhost_nexus *tv_nexus; |
3c63f66a | 869 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
870 | struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL; |
871 | int rc, sg_no_bidi = 0; | |
057cbf49 | 872 | |
3c63f66a AH |
873 | if (cmd->tvc_sgl_count) { |
874 | sg_ptr = cmd->tvc_sgl; | |
057cbf49 NB |
875 | /* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */ |
876 | #if 0 | |
877 | if (se_cmd->se_cmd_flags & SCF_BIDI) { | |
878 | sg_bidi_ptr = NULL; | |
879 | sg_no_bidi = 0; | |
880 | } | |
881 | #endif | |
882 | } else { | |
883 | sg_ptr = NULL; | |
884 | } | |
3c63f66a | 885 | tv_nexus = cmd->tvc_nexus; |
9f0abc15 NB |
886 | |
887 | rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, | |
3c63f66a AH |
888 | cmd->tvc_cdb, &cmd->tvc_sense_buf[0], |
889 | cmd->tvc_lun, cmd->tvc_exp_data_len, | |
890 | cmd->tvc_task_attr, cmd->tvc_data_direction, | |
6d2fa9e1 | 891 | TARGET_SCF_ACK_KREF, sg_ptr, cmd->tvc_sgl_count, |
def2b339 | 892 | sg_bidi_ptr, sg_no_bidi, NULL, 0); |
057cbf49 NB |
893 | if (rc < 0) { |
894 | transport_send_check_condition_and_sense(se_cmd, | |
9f0abc15 | 895 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
057cbf49 | 896 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 897 | } |
057cbf49 NB |
898 | } |
899 | ||
683bd967 AH |
900 | static void |
901 | vhost_scsi_send_bad_target(struct vhost_scsi *vs, | |
902 | struct vhost_virtqueue *vq, | |
903 | int head, unsigned out) | |
637ab21e AH |
904 | { |
905 | struct virtio_scsi_cmd_resp __user *resp; | |
906 | struct virtio_scsi_cmd_resp rsp; | |
907 | int ret; | |
908 | ||
909 | memset(&rsp, 0, sizeof(rsp)); | |
910 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
911 | resp = vq->iov[out].iov_base; | |
912 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
913 | if (!ret) | |
914 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
915 | else | |
916 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
917 | } | |
918 | ||
683bd967 AH |
919 | static void |
920 | vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
057cbf49 | 921 | { |
4f7f46d3 | 922 | struct tcm_vhost_tpg **vs_tpg; |
057cbf49 | 923 | struct virtio_scsi_cmd_req v_req; |
98718312 | 924 | struct tcm_vhost_tpg *tpg; |
3c63f66a | 925 | struct tcm_vhost_cmd *cmd; |
057cbf49 NB |
926 | u32 exp_data_len, data_first, data_num, data_direction; |
927 | unsigned out, in, i; | |
928 | int head, ret; | |
67e18cf9 | 929 | u8 target; |
057cbf49 | 930 | |
e7802212 | 931 | mutex_lock(&vq->mutex); |
4f7f46d3 AH |
932 | /* |
933 | * We can handle the vq only after the endpoint is setup by calling the | |
934 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
4f7f46d3 | 935 | */ |
e7802212 | 936 | vs_tpg = vq->private_data; |
4f7f46d3 | 937 | if (!vs_tpg) |
e7802212 | 938 | goto out; |
057cbf49 | 939 | |
057cbf49 NB |
940 | vhost_disable_notify(&vs->dev, vq); |
941 | ||
942 | for (;;) { | |
943 | head = vhost_get_vq_desc(&vs->dev, vq, vq->iov, | |
944 | ARRAY_SIZE(vq->iov), &out, &in, | |
945 | NULL, NULL); | |
946 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", | |
947 | head, out, in); | |
948 | /* On error, stop handling until the next kick. */ | |
949 | if (unlikely(head < 0)) | |
950 | break; | |
951 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
952 | if (head == vq->num) { | |
953 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
954 | vhost_disable_notify(&vs->dev, vq); | |
955 | continue; | |
956 | } | |
957 | break; | |
958 | } | |
959 | ||
960 | /* FIXME: BIDI operation */ | |
961 | if (out == 1 && in == 1) { | |
962 | data_direction = DMA_NONE; | |
963 | data_first = 0; | |
964 | data_num = 0; | |
965 | } else if (out == 1 && in > 1) { | |
966 | data_direction = DMA_FROM_DEVICE; | |
967 | data_first = out + 1; | |
968 | data_num = in - 1; | |
969 | } else if (out > 1 && in == 1) { | |
970 | data_direction = DMA_TO_DEVICE; | |
971 | data_first = 1; | |
972 | data_num = out - 1; | |
973 | } else { | |
974 | vq_err(vq, "Invalid buffer layout out: %u in: %u\n", | |
975 | out, in); | |
976 | break; | |
977 | } | |
978 | ||
979 | /* | |
980 | * Check for a sane resp buffer so we can report errors to | |
981 | * the guest. | |
982 | */ | |
983 | if (unlikely(vq->iov[out].iov_len != | |
984 | sizeof(struct virtio_scsi_cmd_resp))) { | |
985 | vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu" | |
986 | " bytes\n", vq->iov[out].iov_len); | |
987 | break; | |
988 | } | |
989 | ||
990 | if (unlikely(vq->iov[0].iov_len != sizeof(v_req))) { | |
991 | vq_err(vq, "Expecting virtio_scsi_cmd_req, got %zu" | |
992 | " bytes\n", vq->iov[0].iov_len); | |
993 | break; | |
994 | } | |
995 | pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p," | |
996 | " len: %zu\n", vq->iov[0].iov_base, sizeof(v_req)); | |
997 | ret = __copy_from_user(&v_req, vq->iov[0].iov_base, | |
998 | sizeof(v_req)); | |
999 | if (unlikely(ret)) { | |
1000 | vq_err(vq, "Faulted on virtio_scsi_cmd_req\n"); | |
1001 | break; | |
1002 | } | |
1003 | ||
7fe412d0 VS |
1004 | /* virtio-scsi spec requires byte 0 of the lun to be 1 */ |
1005 | if (unlikely(v_req.lun[0] != 1)) { | |
1006 | vhost_scsi_send_bad_target(vs, vq, head, out); | |
1007 | continue; | |
1008 | } | |
1009 | ||
67e18cf9 AH |
1010 | /* Extract the tpgt */ |
1011 | target = v_req.lun[1]; | |
98718312 | 1012 | tpg = ACCESS_ONCE(vs_tpg[target]); |
67e18cf9 AH |
1013 | |
1014 | /* Target does not exist, fail the request */ | |
98718312 | 1015 | if (unlikely(!tpg)) { |
637ab21e | 1016 | vhost_scsi_send_bad_target(vs, vq, head, out); |
67e18cf9 AH |
1017 | continue; |
1018 | } | |
1019 | ||
057cbf49 NB |
1020 | exp_data_len = 0; |
1021 | for (i = 0; i < data_num; i++) | |
1022 | exp_data_len += vq->iov[data_first + i].iov_len; | |
1023 | ||
4824d3bf NB |
1024 | cmd = vhost_scsi_get_tag(vq, tpg, &v_req, |
1025 | exp_data_len, data_direction); | |
3c63f66a | 1026 | if (IS_ERR(cmd)) { |
4824d3bf | 1027 | vq_err(vq, "vhost_scsi_get_tag failed %ld\n", |
3c63f66a | 1028 | PTR_ERR(cmd)); |
055f648c | 1029 | goto err_cmd; |
057cbf49 NB |
1030 | } |
1031 | pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction" | |
3c63f66a | 1032 | ": %d\n", cmd, exp_data_len, data_direction); |
057cbf49 | 1033 | |
3c63f66a AH |
1034 | cmd->tvc_vhost = vs; |
1035 | cmd->tvc_vq = vq; | |
1036 | cmd->tvc_resp = vq->iov[out].iov_base; | |
057cbf49 NB |
1037 | |
1038 | /* | |
3c63f66a | 1039 | * Copy in the recieved CDB descriptor into cmd->tvc_cdb |
057cbf49 NB |
1040 | * that will be used by tcm_vhost_new_cmd_map() and down into |
1041 | * target_setup_cmd_from_cdb() | |
1042 | */ | |
3c63f66a | 1043 | memcpy(cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE); |
057cbf49 NB |
1044 | /* |
1045 | * Check that the recieved CDB size does not exceeded our | |
1046 | * hardcoded max for tcm_vhost | |
1047 | */ | |
1048 | /* TODO what if cdb was too small for varlen cdb header? */ | |
3c63f66a | 1049 | if (unlikely(scsi_command_size(cmd->tvc_cdb) > |
057cbf49 NB |
1050 | TCM_VHOST_MAX_CDB_SIZE)) { |
1051 | vq_err(vq, "Received SCSI CDB with command_size: %d that" | |
1052 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
3c63f66a | 1053 | scsi_command_size(cmd->tvc_cdb), |
057cbf49 | 1054 | TCM_VHOST_MAX_CDB_SIZE); |
055f648c | 1055 | goto err_free; |
057cbf49 | 1056 | } |
3c63f66a | 1057 | cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; |
057cbf49 NB |
1058 | |
1059 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", | |
3c63f66a | 1060 | cmd->tvc_cdb[0], cmd->tvc_lun); |
057cbf49 NB |
1061 | |
1062 | if (data_direction != DMA_NONE) { | |
3c63f66a | 1063 | ret = vhost_scsi_map_iov_to_sgl(cmd, |
057cbf49 | 1064 | &vq->iov[data_first], data_num, |
60a01f55 | 1065 | data_direction == DMA_FROM_DEVICE); |
057cbf49 NB |
1066 | if (unlikely(ret)) { |
1067 | vq_err(vq, "Failed to map iov to sgl\n"); | |
055f648c | 1068 | goto err_free; |
057cbf49 NB |
1069 | } |
1070 | } | |
1071 | ||
1072 | /* | |
1073 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
1074 | * complete the virtio-scsi request in TCM callback context via | |
1075 | * tcm_vhost_queue_data_in() and tcm_vhost_queue_status() | |
1076 | */ | |
3c63f66a | 1077 | cmd->tvc_vq_desc = head; |
057cbf49 NB |
1078 | /* |
1079 | * Dispatch tv_cmd descriptor for cmwq execution in process | |
1080 | * context provided by tcm_vhost_workqueue. This also ensures | |
1081 | * tv_cmd is executed on the same kworker CPU as this vhost | |
1082 | * thread to gain positive L2 cache locality effects.. | |
1083 | */ | |
3c63f66a AH |
1084 | INIT_WORK(&cmd->work, tcm_vhost_submission_work); |
1085 | queue_work(tcm_vhost_workqueue, &cmd->work); | |
057cbf49 NB |
1086 | } |
1087 | ||
1088 | mutex_unlock(&vq->mutex); | |
7ea206cf AH |
1089 | return; |
1090 | ||
055f648c | 1091 | err_free: |
3c63f66a | 1092 | vhost_scsi_free_cmd(cmd); |
055f648c AH |
1093 | err_cmd: |
1094 | vhost_scsi_send_bad_target(vs, vq, head, out); | |
e7802212 | 1095 | out: |
7ea206cf | 1096 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
1097 | } |
1098 | ||
1099 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) | |
1100 | { | |
101998f6 | 1101 | pr_debug("%s: The handling func for control queue.\n", __func__); |
057cbf49 NB |
1102 | } |
1103 | ||
683bd967 AH |
1104 | static void |
1105 | tcm_vhost_send_evt(struct vhost_scsi *vs, | |
1106 | struct tcm_vhost_tpg *tpg, | |
1107 | struct se_lun *lun, | |
1108 | u32 event, | |
1109 | u32 reason) | |
a6c9af87 AH |
1110 | { |
1111 | struct tcm_vhost_evt *evt; | |
1112 | ||
1113 | evt = tcm_vhost_allocate_evt(vs, event, reason); | |
1114 | if (!evt) | |
1115 | return; | |
1116 | ||
1117 | if (tpg && lun) { | |
1118 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
1119 | /* | |
1120 | * Note: evt->event is zeroed when we allocate it and | |
1121 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
1122 | */ | |
1123 | evt->event.lun[0] = 0x01; | |
1124 | evt->event.lun[1] = tpg->tport_tpgt & 0xFF; | |
1125 | if (lun->unpacked_lun >= 256) | |
1126 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
1127 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
1128 | } | |
1129 | ||
1130 | llist_add(&evt->list, &vs->vs_event_list); | |
1131 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
1132 | } | |
1133 | ||
057cbf49 NB |
1134 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
1135 | { | |
a6c9af87 AH |
1136 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1137 | poll.work); | |
1138 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1139 | ||
1140 | mutex_lock(&vq->mutex); | |
1141 | if (!vq->private_data) | |
1142 | goto out; | |
1143 | ||
1144 | if (vs->vs_events_missed) | |
1145 | tcm_vhost_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); | |
1146 | out: | |
1147 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
1148 | } |
1149 | ||
1150 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
1151 | { | |
1152 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
1153 | poll.work); | |
1154 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1155 | ||
1b7f390e | 1156 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
1157 | } |
1158 | ||
4f7f46d3 AH |
1159 | static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
1160 | { | |
3ab2e420 | 1161 | vhost_poll_flush(&vs->vqs[index].vq.poll); |
4f7f46d3 AH |
1162 | } |
1163 | ||
3dfbff32 | 1164 | /* Callers must hold dev mutex */ |
4f7f46d3 AH |
1165 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
1166 | { | |
f2f0173d | 1167 | struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; |
4f7f46d3 AH |
1168 | int i; |
1169 | ||
f2f0173d AH |
1170 | /* Init new inflight and remember the old inflight */ |
1171 | tcm_vhost_init_inflight(vs, old_inflight); | |
1172 | ||
1173 | /* | |
1174 | * The inflight->kref was initialized to 1. We decrement it here to | |
1175 | * indicate the start of the flush operation so that it will reach 0 | |
1176 | * when all the reqs are finished. | |
1177 | */ | |
1178 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1179 | kref_put(&old_inflight[i]->kref, tcm_vhost_done_inflight); | |
1180 | ||
1181 | /* Flush both the vhost poll and vhost work */ | |
4f7f46d3 AH |
1182 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
1183 | vhost_scsi_flush_vq(vs, i); | |
1184 | vhost_work_flush(&vs->dev, &vs->vs_completion_work); | |
a6c9af87 | 1185 | vhost_work_flush(&vs->dev, &vs->vs_event_work); |
f2f0173d AH |
1186 | |
1187 | /* Wait for all reqs issued before the flush to be finished */ | |
1188 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1189 | wait_for_completion(&old_inflight[i]->comp); | |
4f7f46d3 AH |
1190 | } |
1191 | ||
057cbf49 NB |
1192 | /* |
1193 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
1194 | * tcm_vhost_tpg with an active struct tcm_vhost_nexus | |
f2b7daf5 AH |
1195 | * |
1196 | * The lock nesting rule is: | |
1197 | * tcm_vhost_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex | |
057cbf49 | 1198 | */ |
683bd967 AH |
1199 | static int |
1200 | vhost_scsi_set_endpoint(struct vhost_scsi *vs, | |
1201 | struct vhost_scsi_target *t) | |
057cbf49 NB |
1202 | { |
1203 | struct tcm_vhost_tport *tv_tport; | |
98718312 | 1204 | struct tcm_vhost_tpg *tpg; |
4f7f46d3 AH |
1205 | struct tcm_vhost_tpg **vs_tpg; |
1206 | struct vhost_virtqueue *vq; | |
1207 | int index, ret, i, len; | |
67e18cf9 | 1208 | bool match = false; |
057cbf49 | 1209 | |
f2b7daf5 | 1210 | mutex_lock(&tcm_vhost_mutex); |
057cbf49 | 1211 | mutex_lock(&vs->dev.mutex); |
f2b7daf5 | 1212 | |
057cbf49 NB |
1213 | /* Verify that ring has been setup correctly. */ |
1214 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
1215 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 1216 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
1217 | ret = -EFAULT; |
1218 | goto out; | |
057cbf49 NB |
1219 | } |
1220 | } | |
057cbf49 | 1221 | |
4f7f46d3 AH |
1222 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
1223 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
1224 | if (!vs_tpg) { | |
f2b7daf5 AH |
1225 | ret = -ENOMEM; |
1226 | goto out; | |
4f7f46d3 AH |
1227 | } |
1228 | if (vs->vs_tpg) | |
1229 | memcpy(vs_tpg, vs->vs_tpg, len); | |
1230 | ||
98718312 AH |
1231 | list_for_each_entry(tpg, &tcm_vhost_list, tv_tpg_list) { |
1232 | mutex_lock(&tpg->tv_tpg_mutex); | |
1233 | if (!tpg->tpg_nexus) { | |
1234 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1235 | continue; |
1236 | } | |
98718312 AH |
1237 | if (tpg->tv_tpg_vhost_count != 0) { |
1238 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1239 | continue; |
1240 | } | |
98718312 | 1241 | tv_tport = tpg->tport; |
057cbf49 | 1242 | |
67e18cf9 | 1243 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
98718312 | 1244 | if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
4f7f46d3 | 1245 | kfree(vs_tpg); |
98718312 | 1246 | mutex_unlock(&tpg->tv_tpg_mutex); |
f2b7daf5 AH |
1247 | ret = -EEXIST; |
1248 | goto out; | |
101998f6 | 1249 | } |
98718312 AH |
1250 | tpg->tv_tpg_vhost_count++; |
1251 | tpg->vhost_scsi = vs; | |
1252 | vs_tpg[tpg->tport_tpgt] = tpg; | |
057cbf49 | 1253 | smp_mb__after_atomic_inc(); |
67e18cf9 | 1254 | match = true; |
057cbf49 | 1255 | } |
98718312 | 1256 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1257 | } |
67e18cf9 AH |
1258 | |
1259 | if (match) { | |
1260 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1261 | sizeof(vs->vs_vhost_wwpn)); | |
4f7f46d3 | 1262 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
3ab2e420 | 1263 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1264 | mutex_lock(&vq->mutex); |
22fa90c7 | 1265 | vq->private_data = vs_tpg; |
dfd5d569 | 1266 | vhost_init_used(vq); |
4f7f46d3 AH |
1267 | mutex_unlock(&vq->mutex); |
1268 | } | |
67e18cf9 AH |
1269 | ret = 0; |
1270 | } else { | |
1271 | ret = -EEXIST; | |
1272 | } | |
1273 | ||
4f7f46d3 AH |
1274 | /* |
1275 | * Act as synchronize_rcu to make sure access to | |
1276 | * old vs->vs_tpg is finished. | |
1277 | */ | |
1278 | vhost_scsi_flush(vs); | |
1279 | kfree(vs->vs_tpg); | |
1280 | vs->vs_tpg = vs_tpg; | |
1281 | ||
f2b7daf5 | 1282 | out: |
67e18cf9 | 1283 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1284 | mutex_unlock(&tcm_vhost_mutex); |
67e18cf9 | 1285 | return ret; |
057cbf49 NB |
1286 | } |
1287 | ||
683bd967 AH |
1288 | static int |
1289 | vhost_scsi_clear_endpoint(struct vhost_scsi *vs, | |
1290 | struct vhost_scsi_target *t) | |
057cbf49 NB |
1291 | { |
1292 | struct tcm_vhost_tport *tv_tport; | |
98718312 | 1293 | struct tcm_vhost_tpg *tpg; |
4f7f46d3 AH |
1294 | struct vhost_virtqueue *vq; |
1295 | bool match = false; | |
67e18cf9 AH |
1296 | int index, ret, i; |
1297 | u8 target; | |
057cbf49 | 1298 | |
f2b7daf5 | 1299 | mutex_lock(&tcm_vhost_mutex); |
057cbf49 NB |
1300 | mutex_lock(&vs->dev.mutex); |
1301 | /* Verify that ring has been setup correctly. */ | |
1302 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1303 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1304 | ret = -EFAULT; |
038e0af4 | 1305 | goto err_dev; |
057cbf49 NB |
1306 | } |
1307 | } | |
4f7f46d3 AH |
1308 | |
1309 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1310 | ret = 0; |
1311 | goto err_dev; | |
4f7f46d3 AH |
1312 | } |
1313 | ||
67e18cf9 AH |
1314 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1315 | target = i; | |
98718312 AH |
1316 | tpg = vs->vs_tpg[target]; |
1317 | if (!tpg) | |
67e18cf9 AH |
1318 | continue; |
1319 | ||
98718312 AH |
1320 | mutex_lock(&tpg->tv_tpg_mutex); |
1321 | tv_tport = tpg->tport; | |
67e18cf9 AH |
1322 | if (!tv_tport) { |
1323 | ret = -ENODEV; | |
038e0af4 | 1324 | goto err_tpg; |
67e18cf9 AH |
1325 | } |
1326 | ||
1327 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
98718312 | 1328 | pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" |
67e18cf9 | 1329 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", |
98718312 | 1330 | tv_tport->tport_name, tpg->tport_tpgt, |
67e18cf9 AH |
1331 | t->vhost_wwpn, t->vhost_tpgt); |
1332 | ret = -EINVAL; | |
038e0af4 | 1333 | goto err_tpg; |
67e18cf9 | 1334 | } |
98718312 AH |
1335 | tpg->tv_tpg_vhost_count--; |
1336 | tpg->vhost_scsi = NULL; | |
67e18cf9 | 1337 | vs->vs_tpg[target] = NULL; |
4f7f46d3 | 1338 | match = true; |
98718312 | 1339 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1340 | } |
4f7f46d3 AH |
1341 | if (match) { |
1342 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
3ab2e420 | 1343 | vq = &vs->vqs[i].vq; |
4f7f46d3 | 1344 | mutex_lock(&vq->mutex); |
22fa90c7 | 1345 | vq->private_data = NULL; |
4f7f46d3 AH |
1346 | mutex_unlock(&vq->mutex); |
1347 | } | |
1348 | } | |
1349 | /* | |
1350 | * Act as synchronize_rcu to make sure access to | |
1351 | * old vs->vs_tpg is finished. | |
1352 | */ | |
1353 | vhost_scsi_flush(vs); | |
1354 | kfree(vs->vs_tpg); | |
1355 | vs->vs_tpg = NULL; | |
a6c9af87 | 1356 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1357 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1358 | mutex_unlock(&tcm_vhost_mutex); |
057cbf49 | 1359 | return 0; |
101998f6 | 1360 | |
038e0af4 | 1361 | err_tpg: |
98718312 | 1362 | mutex_unlock(&tpg->tv_tpg_mutex); |
038e0af4 | 1363 | err_dev: |
101998f6 | 1364 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1365 | mutex_unlock(&tcm_vhost_mutex); |
101998f6 | 1366 | return ret; |
057cbf49 NB |
1367 | } |
1368 | ||
4f7f46d3 AH |
1369 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1370 | { | |
1371 | if (features & ~VHOST_SCSI_FEATURES) | |
1372 | return -EOPNOTSUPP; | |
1373 | ||
1374 | mutex_lock(&vs->dev.mutex); | |
1375 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1376 | !vhost_log_access_ok(&vs->dev)) { | |
1377 | mutex_unlock(&vs->dev.mutex); | |
1378 | return -EFAULT; | |
1379 | } | |
1380 | vs->dev.acked_features = features; | |
1381 | smp_wmb(); | |
1382 | vhost_scsi_flush(vs); | |
1383 | mutex_unlock(&vs->dev.mutex); | |
1384 | return 0; | |
1385 | } | |
1386 | ||
595cb754 MT |
1387 | static void vhost_scsi_free(struct vhost_scsi *vs) |
1388 | { | |
1389 | if (is_vmalloc_addr(vs)) | |
1390 | vfree(vs); | |
1391 | else | |
1392 | kfree(vs); | |
1393 | } | |
1394 | ||
057cbf49 NB |
1395 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1396 | { | |
c7289312 | 1397 | struct vhost_scsi *vs; |
3ab2e420 | 1398 | struct vhost_virtqueue **vqs; |
595cb754 | 1399 | int r = -ENOMEM, i; |
057cbf49 | 1400 | |
595cb754 MT |
1401 | vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
1402 | if (!vs) { | |
1403 | vs = vzalloc(sizeof(*vs)); | |
1404 | if (!vs) | |
1405 | goto err_vs; | |
1406 | } | |
057cbf49 | 1407 | |
3ab2e420 | 1408 | vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL); |
595cb754 MT |
1409 | if (!vqs) |
1410 | goto err_vqs; | |
3ab2e420 | 1411 | |
c7289312 AH |
1412 | vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); |
1413 | vhost_work_init(&vs->vs_event_work, tcm_vhost_evt_work); | |
a6c9af87 | 1414 | |
c7289312 AH |
1415 | vs->vs_events_nr = 0; |
1416 | vs->vs_events_missed = false; | |
057cbf49 | 1417 | |
c7289312 AH |
1418 | vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; |
1419 | vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1420 | vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1421 | vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
3ab2e420 | 1422 | for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { |
c7289312 AH |
1423 | vqs[i] = &vs->vqs[i].vq; |
1424 | vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
3ab2e420 | 1425 | } |
59566b6e | 1426 | vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ); |
f2f0173d | 1427 | |
c7289312 | 1428 | tcm_vhost_init_inflight(vs, NULL); |
f2f0173d | 1429 | |
c7289312 | 1430 | f->private_data = vs; |
057cbf49 | 1431 | return 0; |
595cb754 | 1432 | |
595cb754 MT |
1433 | err_vqs: |
1434 | vhost_scsi_free(vs); | |
1435 | err_vs: | |
1436 | return r; | |
057cbf49 NB |
1437 | } |
1438 | ||
1439 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1440 | { | |
c7289312 | 1441 | struct vhost_scsi *vs = f->private_data; |
67e18cf9 | 1442 | struct vhost_scsi_target t; |
057cbf49 | 1443 | |
c7289312 AH |
1444 | mutex_lock(&vs->dev.mutex); |
1445 | memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1446 | mutex_unlock(&vs->dev.mutex); | |
1447 | vhost_scsi_clear_endpoint(vs, &t); | |
1448 | vhost_dev_stop(&vs->dev); | |
1449 | vhost_dev_cleanup(&vs->dev, false); | |
a6c9af87 | 1450 | /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
c7289312 AH |
1451 | vhost_scsi_flush(vs); |
1452 | kfree(vs->dev.vqs); | |
595cb754 | 1453 | vhost_scsi_free(vs); |
057cbf49 NB |
1454 | return 0; |
1455 | } | |
1456 | ||
683bd967 AH |
1457 | static long |
1458 | vhost_scsi_ioctl(struct file *f, | |
1459 | unsigned int ioctl, | |
1460 | unsigned long arg) | |
057cbf49 NB |
1461 | { |
1462 | struct vhost_scsi *vs = f->private_data; | |
1463 | struct vhost_scsi_target backend; | |
1464 | void __user *argp = (void __user *)arg; | |
1465 | u64 __user *featurep = argp; | |
11c63418 AH |
1466 | u32 __user *eventsp = argp; |
1467 | u32 events_missed; | |
057cbf49 | 1468 | u64 features; |
101998f6 | 1469 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1470 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1471 | |
1472 | switch (ioctl) { | |
1473 | case VHOST_SCSI_SET_ENDPOINT: | |
1474 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1475 | return -EFAULT; | |
6de7145c MT |
1476 | if (backend.reserved != 0) |
1477 | return -EOPNOTSUPP; | |
057cbf49 NB |
1478 | |
1479 | return vhost_scsi_set_endpoint(vs, &backend); | |
1480 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1481 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1482 | return -EFAULT; | |
6de7145c MT |
1483 | if (backend.reserved != 0) |
1484 | return -EOPNOTSUPP; | |
057cbf49 NB |
1485 | |
1486 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1487 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1488 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1489 | return -EFAULT; |
1490 | return 0; | |
11c63418 AH |
1491 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1492 | if (get_user(events_missed, eventsp)) | |
1493 | return -EFAULT; | |
1494 | mutex_lock(&vq->mutex); | |
1495 | vs->vs_events_missed = events_missed; | |
1496 | mutex_unlock(&vq->mutex); | |
1497 | return 0; | |
1498 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1499 | mutex_lock(&vq->mutex); | |
1500 | events_missed = vs->vs_events_missed; | |
1501 | mutex_unlock(&vq->mutex); | |
1502 | if (put_user(events_missed, eventsp)) | |
1503 | return -EFAULT; | |
1504 | return 0; | |
057cbf49 | 1505 | case VHOST_GET_FEATURES: |
5dade710 | 1506 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1507 | if (copy_to_user(featurep, &features, sizeof features)) |
1508 | return -EFAULT; | |
1509 | return 0; | |
1510 | case VHOST_SET_FEATURES: | |
1511 | if (copy_from_user(&features, featurep, sizeof features)) | |
1512 | return -EFAULT; | |
1513 | return vhost_scsi_set_features(vs, features); | |
1514 | default: | |
1515 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1516 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1517 | /* TODO: flush backend after dev ioctl. */ | |
1518 | if (r == -ENOIOCTLCMD) | |
1519 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1520 | mutex_unlock(&vs->dev.mutex); |
1521 | return r; | |
1522 | } | |
1523 | } | |
1524 | ||
101998f6 NB |
1525 | #ifdef CONFIG_COMPAT |
1526 | static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, | |
1527 | unsigned long arg) | |
1528 | { | |
1529 | return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1530 | } | |
1531 | #endif | |
1532 | ||
057cbf49 NB |
1533 | static const struct file_operations vhost_scsi_fops = { |
1534 | .owner = THIS_MODULE, | |
1535 | .release = vhost_scsi_release, | |
1536 | .unlocked_ioctl = vhost_scsi_ioctl, | |
101998f6 NB |
1537 | #ifdef CONFIG_COMPAT |
1538 | .compat_ioctl = vhost_scsi_compat_ioctl, | |
1539 | #endif | |
057cbf49 NB |
1540 | .open = vhost_scsi_open, |
1541 | .llseek = noop_llseek, | |
1542 | }; | |
1543 | ||
1544 | static struct miscdevice vhost_scsi_misc = { | |
1545 | MISC_DYNAMIC_MINOR, | |
1546 | "vhost-scsi", | |
1547 | &vhost_scsi_fops, | |
1548 | }; | |
1549 | ||
1550 | static int __init vhost_scsi_register(void) | |
1551 | { | |
1552 | return misc_register(&vhost_scsi_misc); | |
1553 | } | |
1554 | ||
1555 | static int vhost_scsi_deregister(void) | |
1556 | { | |
1557 | return misc_deregister(&vhost_scsi_misc); | |
1558 | } | |
1559 | ||
1560 | static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport) | |
1561 | { | |
1562 | switch (tport->tport_proto_id) { | |
1563 | case SCSI_PROTOCOL_SAS: | |
1564 | return "SAS"; | |
1565 | case SCSI_PROTOCOL_FCP: | |
1566 | return "FCP"; | |
1567 | case SCSI_PROTOCOL_ISCSI: | |
1568 | return "iSCSI"; | |
1569 | default: | |
1570 | break; | |
1571 | } | |
1572 | ||
1573 | return "Unknown"; | |
1574 | } | |
1575 | ||
683bd967 AH |
1576 | static void |
1577 | tcm_vhost_do_plug(struct tcm_vhost_tpg *tpg, | |
1578 | struct se_lun *lun, bool plug) | |
a6c9af87 AH |
1579 | { |
1580 | ||
1581 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1582 | struct vhost_virtqueue *vq; | |
1583 | u32 reason; | |
1584 | ||
1585 | if (!vs) | |
1586 | return; | |
1587 | ||
1588 | mutex_lock(&vs->dev.mutex); | |
1589 | if (!vhost_has_feature(&vs->dev, VIRTIO_SCSI_F_HOTPLUG)) { | |
1590 | mutex_unlock(&vs->dev.mutex); | |
1591 | return; | |
1592 | } | |
1593 | ||
1594 | if (plug) | |
1595 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1596 | else | |
1597 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1598 | ||
3ab2e420 | 1599 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
1600 | mutex_lock(&vq->mutex); |
1601 | tcm_vhost_send_evt(vs, tpg, lun, | |
1602 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); | |
1603 | mutex_unlock(&vq->mutex); | |
1604 | mutex_unlock(&vs->dev.mutex); | |
1605 | } | |
1606 | ||
1607 | static void tcm_vhost_hotplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun) | |
1608 | { | |
1609 | tcm_vhost_do_plug(tpg, lun, true); | |
1610 | } | |
1611 | ||
1612 | static void tcm_vhost_hotunplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun) | |
1613 | { | |
1614 | tcm_vhost_do_plug(tpg, lun, false); | |
1615 | } | |
1616 | ||
101998f6 | 1617 | static int tcm_vhost_port_link(struct se_portal_group *se_tpg, |
683bd967 | 1618 | struct se_lun *lun) |
057cbf49 | 1619 | { |
98718312 | 1620 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, |
057cbf49 NB |
1621 | struct tcm_vhost_tpg, se_tpg); |
1622 | ||
a6c9af87 AH |
1623 | mutex_lock(&tcm_vhost_mutex); |
1624 | ||
98718312 AH |
1625 | mutex_lock(&tpg->tv_tpg_mutex); |
1626 | tpg->tv_tpg_port_count++; | |
1627 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 | 1628 | |
98718312 | 1629 | tcm_vhost_hotplug(tpg, lun); |
a6c9af87 AH |
1630 | |
1631 | mutex_unlock(&tcm_vhost_mutex); | |
1632 | ||
057cbf49 NB |
1633 | return 0; |
1634 | } | |
1635 | ||
101998f6 | 1636 | static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg, |
683bd967 | 1637 | struct se_lun *lun) |
057cbf49 | 1638 | { |
98718312 | 1639 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, |
057cbf49 NB |
1640 | struct tcm_vhost_tpg, se_tpg); |
1641 | ||
a6c9af87 AH |
1642 | mutex_lock(&tcm_vhost_mutex); |
1643 | ||
98718312 AH |
1644 | mutex_lock(&tpg->tv_tpg_mutex); |
1645 | tpg->tv_tpg_port_count--; | |
1646 | mutex_unlock(&tpg->tv_tpg_mutex); | |
a6c9af87 | 1647 | |
98718312 | 1648 | tcm_vhost_hotunplug(tpg, lun); |
a6c9af87 AH |
1649 | |
1650 | mutex_unlock(&tcm_vhost_mutex); | |
057cbf49 NB |
1651 | } |
1652 | ||
683bd967 AH |
1653 | static struct se_node_acl * |
1654 | tcm_vhost_make_nodeacl(struct se_portal_group *se_tpg, | |
1655 | struct config_group *group, | |
1656 | const char *name) | |
057cbf49 NB |
1657 | { |
1658 | struct se_node_acl *se_nacl, *se_nacl_new; | |
1659 | struct tcm_vhost_nacl *nacl; | |
1660 | u64 wwpn = 0; | |
1661 | u32 nexus_depth; | |
1662 | ||
1663 | /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0) | |
1664 | return ERR_PTR(-EINVAL); */ | |
1665 | se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg); | |
1666 | if (!se_nacl_new) | |
1667 | return ERR_PTR(-ENOMEM); | |
1668 | ||
1669 | nexus_depth = 1; | |
1670 | /* | |
1671 | * se_nacl_new may be released by core_tpg_add_initiator_node_acl() | |
1672 | * when converting a NodeACL from demo mode -> explict | |
1673 | */ | |
1674 | se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new, | |
1675 | name, nexus_depth); | |
1676 | if (IS_ERR(se_nacl)) { | |
1677 | tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new); | |
1678 | return se_nacl; | |
1679 | } | |
1680 | /* | |
1681 | * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN | |
1682 | */ | |
1683 | nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl); | |
1684 | nacl->iport_wwpn = wwpn; | |
1685 | ||
1686 | return se_nacl; | |
1687 | } | |
1688 | ||
1689 | static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl) | |
1690 | { | |
1691 | struct tcm_vhost_nacl *nacl = container_of(se_acl, | |
1692 | struct tcm_vhost_nacl, se_node_acl); | |
1693 | core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1); | |
1694 | kfree(nacl); | |
1695 | } | |
1696 | ||
3aee26b4 NB |
1697 | static void tcm_vhost_free_cmd_map_res(struct tcm_vhost_nexus *nexus, |
1698 | struct se_session *se_sess) | |
1699 | { | |
1700 | struct tcm_vhost_cmd *tv_cmd; | |
1701 | unsigned int i; | |
1702 | ||
1703 | if (!se_sess->sess_cmd_map) | |
1704 | return; | |
1705 | ||
1706 | for (i = 0; i < TCM_VHOST_DEFAULT_TAGS; i++) { | |
1707 | tv_cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[i]; | |
1708 | ||
1709 | kfree(tv_cmd->tvc_sgl); | |
b1935f68 | 1710 | kfree(tv_cmd->tvc_prot_sgl); |
3aee26b4 NB |
1711 | kfree(tv_cmd->tvc_upages); |
1712 | } | |
1713 | } | |
1714 | ||
98718312 | 1715 | static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tpg, |
683bd967 | 1716 | const char *name) |
057cbf49 NB |
1717 | { |
1718 | struct se_portal_group *se_tpg; | |
3aee26b4 | 1719 | struct se_session *se_sess; |
057cbf49 | 1720 | struct tcm_vhost_nexus *tv_nexus; |
3aee26b4 NB |
1721 | struct tcm_vhost_cmd *tv_cmd; |
1722 | unsigned int i; | |
057cbf49 | 1723 | |
98718312 AH |
1724 | mutex_lock(&tpg->tv_tpg_mutex); |
1725 | if (tpg->tpg_nexus) { | |
1726 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1727 | pr_debug("tpg->tpg_nexus already exists\n"); | |
057cbf49 NB |
1728 | return -EEXIST; |
1729 | } | |
98718312 | 1730 | se_tpg = &tpg->se_tpg; |
057cbf49 NB |
1731 | |
1732 | tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL); | |
1733 | if (!tv_nexus) { | |
98718312 | 1734 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1735 | pr_err("Unable to allocate struct tcm_vhost_nexus\n"); |
1736 | return -ENOMEM; | |
1737 | } | |
1738 | /* | |
4824d3bf NB |
1739 | * Initialize the struct se_session pointer and setup tagpool |
1740 | * for struct tcm_vhost_cmd descriptors | |
057cbf49 | 1741 | */ |
4824d3bf NB |
1742 | tv_nexus->tvn_se_sess = transport_init_session_tags( |
1743 | TCM_VHOST_DEFAULT_TAGS, | |
e70beee7 NB |
1744 | sizeof(struct tcm_vhost_cmd), |
1745 | TARGET_PROT_NORMAL); | |
057cbf49 | 1746 | if (IS_ERR(tv_nexus->tvn_se_sess)) { |
98718312 | 1747 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1748 | kfree(tv_nexus); |
1749 | return -ENOMEM; | |
1750 | } | |
3aee26b4 NB |
1751 | se_sess = tv_nexus->tvn_se_sess; |
1752 | for (i = 0; i < TCM_VHOST_DEFAULT_TAGS; i++) { | |
1753 | tv_cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[i]; | |
1754 | ||
1755 | tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) * | |
1756 | TCM_VHOST_PREALLOC_SGLS, GFP_KERNEL); | |
1757 | if (!tv_cmd->tvc_sgl) { | |
1758 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1759 | pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); | |
1760 | goto out; | |
1761 | } | |
1762 | ||
1763 | tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) * | |
5a01d082 | 1764 | TCM_VHOST_PREALLOC_UPAGES, GFP_KERNEL); |
3aee26b4 NB |
1765 | if (!tv_cmd->tvc_upages) { |
1766 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1767 | pr_err("Unable to allocate tv_cmd->tvc_upages\n"); | |
1768 | goto out; | |
1769 | } | |
b1935f68 NB |
1770 | |
1771 | tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) * | |
1772 | TCM_VHOST_PREALLOC_PROT_SGLS, GFP_KERNEL); | |
1773 | if (!tv_cmd->tvc_prot_sgl) { | |
1774 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1775 | pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); | |
1776 | goto out; | |
1777 | } | |
3aee26b4 | 1778 | } |
057cbf49 NB |
1779 | /* |
1780 | * Since we are running in 'demo mode' this call with generate a | |
1781 | * struct se_node_acl for the tcm_vhost struct se_portal_group with | |
1782 | * the SCSI Initiator port name of the passed configfs group 'name'. | |
1783 | */ | |
1784 | tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
1785 | se_tpg, (unsigned char *)name); | |
1786 | if (!tv_nexus->tvn_se_sess->se_node_acl) { | |
98718312 | 1787 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1788 | pr_debug("core_tpg_check_initiator_node_acl() failed" |
1789 | " for %s\n", name); | |
3aee26b4 | 1790 | goto out; |
057cbf49 NB |
1791 | } |
1792 | /* | |
101998f6 | 1793 | * Now register the TCM vhost virtual I_T Nexus as active with the |
057cbf49 NB |
1794 | * call to __transport_register_session() |
1795 | */ | |
1796 | __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl, | |
1797 | tv_nexus->tvn_se_sess, tv_nexus); | |
98718312 | 1798 | tpg->tpg_nexus = tv_nexus; |
057cbf49 | 1799 | |
98718312 | 1800 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1801 | return 0; |
3aee26b4 NB |
1802 | |
1803 | out: | |
1804 | tcm_vhost_free_cmd_map_res(tv_nexus, se_sess); | |
1805 | transport_free_session(se_sess); | |
1806 | kfree(tv_nexus); | |
1807 | return -ENOMEM; | |
057cbf49 NB |
1808 | } |
1809 | ||
101998f6 | 1810 | static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg *tpg) |
057cbf49 NB |
1811 | { |
1812 | struct se_session *se_sess; | |
1813 | struct tcm_vhost_nexus *tv_nexus; | |
1814 | ||
1815 | mutex_lock(&tpg->tv_tpg_mutex); | |
1816 | tv_nexus = tpg->tpg_nexus; | |
1817 | if (!tv_nexus) { | |
1818 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1819 | return -ENODEV; | |
1820 | } | |
1821 | ||
1822 | se_sess = tv_nexus->tvn_se_sess; | |
1823 | if (!se_sess) { | |
1824 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1825 | return -ENODEV; | |
1826 | } | |
1827 | ||
101998f6 | 1828 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 1829 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1830 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1831 | " active TPG port count: %d\n", |
101998f6 NB |
1832 | tpg->tv_tpg_port_count); |
1833 | return -EBUSY; | |
057cbf49 NB |
1834 | } |
1835 | ||
101998f6 | 1836 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 1837 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1838 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1839 | " active TPG vhost count: %d\n", |
101998f6 NB |
1840 | tpg->tv_tpg_vhost_count); |
1841 | return -EBUSY; | |
057cbf49 NB |
1842 | } |
1843 | ||
101998f6 | 1844 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
057cbf49 NB |
1845 | " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport), |
1846 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
3aee26b4 NB |
1847 | |
1848 | tcm_vhost_free_cmd_map_res(tv_nexus, se_sess); | |
057cbf49 | 1849 | /* |
101998f6 | 1850 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 NB |
1851 | */ |
1852 | transport_deregister_session(tv_nexus->tvn_se_sess); | |
1853 | tpg->tpg_nexus = NULL; | |
1854 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1855 | ||
1856 | kfree(tv_nexus); | |
1857 | return 0; | |
1858 | } | |
1859 | ||
101998f6 | 1860 | static ssize_t tcm_vhost_tpg_show_nexus(struct se_portal_group *se_tpg, |
683bd967 | 1861 | char *page) |
057cbf49 | 1862 | { |
98718312 | 1863 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, |
057cbf49 NB |
1864 | struct tcm_vhost_tpg, se_tpg); |
1865 | struct tcm_vhost_nexus *tv_nexus; | |
1866 | ssize_t ret; | |
1867 | ||
98718312 AH |
1868 | mutex_lock(&tpg->tv_tpg_mutex); |
1869 | tv_nexus = tpg->tpg_nexus; | |
057cbf49 | 1870 | if (!tv_nexus) { |
98718312 | 1871 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1872 | return -ENODEV; |
1873 | } | |
1874 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1875 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
98718312 | 1876 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1877 | |
1878 | return ret; | |
1879 | } | |
1880 | ||
101998f6 | 1881 | static ssize_t tcm_vhost_tpg_store_nexus(struct se_portal_group *se_tpg, |
683bd967 AH |
1882 | const char *page, |
1883 | size_t count) | |
057cbf49 | 1884 | { |
98718312 | 1885 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, |
057cbf49 | 1886 | struct tcm_vhost_tpg, se_tpg); |
98718312 | 1887 | struct tcm_vhost_tport *tport_wwn = tpg->tport; |
057cbf49 NB |
1888 | unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr; |
1889 | int ret; | |
1890 | /* | |
1891 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
1892 | */ | |
1893 | if (!strncmp(page, "NULL", 4)) { | |
98718312 | 1894 | ret = tcm_vhost_drop_nexus(tpg); |
057cbf49 NB |
1895 | return (!ret) ? count : ret; |
1896 | } | |
1897 | /* | |
1898 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1899 | * the fabric protocol_id set in tcm_vhost_make_tport(), and call | |
1900 | * tcm_vhost_make_nexus(). | |
1901 | */ | |
1902 | if (strlen(page) >= TCM_VHOST_NAMELEN) { | |
1903 | pr_err("Emulated NAA Sas Address: %s, exceeds" | |
1904 | " max: %d\n", page, TCM_VHOST_NAMELEN); | |
1905 | return -EINVAL; | |
1906 | } | |
1907 | snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page); | |
1908 | ||
1909 | ptr = strstr(i_port, "naa."); | |
1910 | if (ptr) { | |
1911 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
1912 | pr_err("Passed SAS Initiator Port %s does not" | |
1913 | " match target port protoid: %s\n", i_port, | |
1914 | tcm_vhost_dump_proto_id(tport_wwn)); | |
1915 | return -EINVAL; | |
1916 | } | |
1917 | port_ptr = &i_port[0]; | |
1918 | goto check_newline; | |
1919 | } | |
1920 | ptr = strstr(i_port, "fc."); | |
1921 | if (ptr) { | |
1922 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
1923 | pr_err("Passed FCP Initiator Port %s does not" | |
1924 | " match target port protoid: %s\n", i_port, | |
1925 | tcm_vhost_dump_proto_id(tport_wwn)); | |
1926 | return -EINVAL; | |
1927 | } | |
1928 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1929 | goto check_newline; | |
1930 | } | |
1931 | ptr = strstr(i_port, "iqn."); | |
1932 | if (ptr) { | |
1933 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
1934 | pr_err("Passed iSCSI Initiator Port %s does not" | |
1935 | " match target port protoid: %s\n", i_port, | |
1936 | tcm_vhost_dump_proto_id(tport_wwn)); | |
1937 | return -EINVAL; | |
1938 | } | |
1939 | port_ptr = &i_port[0]; | |
1940 | goto check_newline; | |
1941 | } | |
1942 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
1943 | " %s\n", i_port); | |
1944 | return -EINVAL; | |
1945 | /* | |
1946 | * Clear any trailing newline for the NAA WWN | |
1947 | */ | |
1948 | check_newline: | |
1949 | if (i_port[strlen(i_port)-1] == '\n') | |
1950 | i_port[strlen(i_port)-1] = '\0'; | |
1951 | ||
98718312 | 1952 | ret = tcm_vhost_make_nexus(tpg, port_ptr); |
057cbf49 NB |
1953 | if (ret < 0) |
1954 | return ret; | |
1955 | ||
1956 | return count; | |
1957 | } | |
1958 | ||
1959 | TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR); | |
1960 | ||
1961 | static struct configfs_attribute *tcm_vhost_tpg_attrs[] = { | |
1962 | &tcm_vhost_tpg_nexus.attr, | |
1963 | NULL, | |
1964 | }; | |
1965 | ||
683bd967 AH |
1966 | static struct se_portal_group * |
1967 | tcm_vhost_make_tpg(struct se_wwn *wwn, | |
1968 | struct config_group *group, | |
1969 | const char *name) | |
057cbf49 NB |
1970 | { |
1971 | struct tcm_vhost_tport *tport = container_of(wwn, | |
1972 | struct tcm_vhost_tport, tport_wwn); | |
1973 | ||
1974 | struct tcm_vhost_tpg *tpg; | |
1975 | unsigned long tpgt; | |
1976 | int ret; | |
1977 | ||
1978 | if (strstr(name, "tpgt_") != name) | |
1979 | return ERR_PTR(-EINVAL); | |
1980 | if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX) | |
1981 | return ERR_PTR(-EINVAL); | |
1982 | ||
1983 | tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL); | |
1984 | if (!tpg) { | |
1985 | pr_err("Unable to allocate struct tcm_vhost_tpg"); | |
1986 | return ERR_PTR(-ENOMEM); | |
1987 | } | |
1988 | mutex_init(&tpg->tv_tpg_mutex); | |
1989 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
1990 | tpg->tport = tport; | |
1991 | tpg->tport_tpgt = tpgt; | |
1992 | ||
1993 | ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn, | |
1994 | &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL); | |
1995 | if (ret < 0) { | |
1996 | kfree(tpg); | |
1997 | return NULL; | |
1998 | } | |
1999 | mutex_lock(&tcm_vhost_mutex); | |
2000 | list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list); | |
2001 | mutex_unlock(&tcm_vhost_mutex); | |
2002 | ||
2003 | return &tpg->se_tpg; | |
2004 | } | |
2005 | ||
2006 | static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg) | |
2007 | { | |
2008 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
2009 | struct tcm_vhost_tpg, se_tpg); | |
2010 | ||
2011 | mutex_lock(&tcm_vhost_mutex); | |
2012 | list_del(&tpg->tv_tpg_list); | |
2013 | mutex_unlock(&tcm_vhost_mutex); | |
2014 | /* | |
101998f6 | 2015 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 NB |
2016 | */ |
2017 | tcm_vhost_drop_nexus(tpg); | |
2018 | /* | |
2019 | * Deregister the se_tpg from TCM.. | |
2020 | */ | |
2021 | core_tpg_deregister(se_tpg); | |
2022 | kfree(tpg); | |
2023 | } | |
2024 | ||
683bd967 AH |
2025 | static struct se_wwn * |
2026 | tcm_vhost_make_tport(struct target_fabric_configfs *tf, | |
2027 | struct config_group *group, | |
2028 | const char *name) | |
057cbf49 NB |
2029 | { |
2030 | struct tcm_vhost_tport *tport; | |
2031 | char *ptr; | |
2032 | u64 wwpn = 0; | |
2033 | int off = 0; | |
2034 | ||
2035 | /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0) | |
2036 | return ERR_PTR(-EINVAL); */ | |
2037 | ||
2038 | tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL); | |
2039 | if (!tport) { | |
2040 | pr_err("Unable to allocate struct tcm_vhost_tport"); | |
2041 | return ERR_PTR(-ENOMEM); | |
2042 | } | |
2043 | tport->tport_wwpn = wwpn; | |
2044 | /* | |
2045 | * Determine the emulated Protocol Identifier and Target Port Name | |
2046 | * based on the incoming configfs directory name. | |
2047 | */ | |
2048 | ptr = strstr(name, "naa."); | |
2049 | if (ptr) { | |
2050 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
2051 | goto check_len; | |
2052 | } | |
2053 | ptr = strstr(name, "fc."); | |
2054 | if (ptr) { | |
2055 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
2056 | off = 3; /* Skip over "fc." */ | |
2057 | goto check_len; | |
2058 | } | |
2059 | ptr = strstr(name, "iqn."); | |
2060 | if (ptr) { | |
2061 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
2062 | goto check_len; | |
2063 | } | |
2064 | ||
2065 | pr_err("Unable to locate prefix for emulated Target Port:" | |
2066 | " %s\n", name); | |
2067 | kfree(tport); | |
2068 | return ERR_PTR(-EINVAL); | |
2069 | ||
2070 | check_len: | |
2071 | if (strlen(name) >= TCM_VHOST_NAMELEN) { | |
2072 | pr_err("Emulated %s Address: %s, exceeds" | |
2073 | " max: %d\n", name, tcm_vhost_dump_proto_id(tport), | |
2074 | TCM_VHOST_NAMELEN); | |
2075 | kfree(tport); | |
2076 | return ERR_PTR(-EINVAL); | |
2077 | } | |
2078 | snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]); | |
2079 | ||
2080 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
2081 | " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name); | |
2082 | ||
2083 | return &tport->tport_wwn; | |
2084 | } | |
2085 | ||
2086 | static void tcm_vhost_drop_tport(struct se_wwn *wwn) | |
2087 | { | |
2088 | struct tcm_vhost_tport *tport = container_of(wwn, | |
2089 | struct tcm_vhost_tport, tport_wwn); | |
2090 | ||
2091 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
2092 | " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), | |
2093 | tport->tport_name); | |
2094 | ||
2095 | kfree(tport); | |
2096 | } | |
2097 | ||
683bd967 AH |
2098 | static ssize_t |
2099 | tcm_vhost_wwn_show_attr_version(struct target_fabric_configfs *tf, | |
2100 | char *page) | |
057cbf49 NB |
2101 | { |
2102 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" | |
2103 | "on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname, | |
2104 | utsname()->machine); | |
2105 | } | |
2106 | ||
2107 | TF_WWN_ATTR_RO(tcm_vhost, version); | |
2108 | ||
2109 | static struct configfs_attribute *tcm_vhost_wwn_attrs[] = { | |
2110 | &tcm_vhost_wwn_version.attr, | |
2111 | NULL, | |
2112 | }; | |
2113 | ||
2114 | static struct target_core_fabric_ops tcm_vhost_ops = { | |
2115 | .get_fabric_name = tcm_vhost_get_fabric_name, | |
2116 | .get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident, | |
2117 | .tpg_get_wwn = tcm_vhost_get_fabric_wwn, | |
2118 | .tpg_get_tag = tcm_vhost_get_tag, | |
2119 | .tpg_get_default_depth = tcm_vhost_get_default_depth, | |
2120 | .tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id, | |
2121 | .tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len, | |
2122 | .tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id, | |
2123 | .tpg_check_demo_mode = tcm_vhost_check_true, | |
2124 | .tpg_check_demo_mode_cache = tcm_vhost_check_true, | |
2125 | .tpg_check_demo_mode_write_protect = tcm_vhost_check_false, | |
2126 | .tpg_check_prod_mode_write_protect = tcm_vhost_check_false, | |
2127 | .tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl, | |
2128 | .tpg_release_fabric_acl = tcm_vhost_release_fabric_acl, | |
2129 | .tpg_get_inst_index = tcm_vhost_tpg_get_inst_index, | |
2130 | .release_cmd = tcm_vhost_release_cmd, | |
084ed45b | 2131 | .check_stop_free = vhost_scsi_check_stop_free, |
057cbf49 NB |
2132 | .shutdown_session = tcm_vhost_shutdown_session, |
2133 | .close_session = tcm_vhost_close_session, | |
2134 | .sess_get_index = tcm_vhost_sess_get_index, | |
2135 | .sess_get_initiator_sid = NULL, | |
2136 | .write_pending = tcm_vhost_write_pending, | |
2137 | .write_pending_status = tcm_vhost_write_pending_status, | |
2138 | .set_default_node_attributes = tcm_vhost_set_default_node_attrs, | |
2139 | .get_task_tag = tcm_vhost_get_task_tag, | |
2140 | .get_cmd_state = tcm_vhost_get_cmd_state, | |
2141 | .queue_data_in = tcm_vhost_queue_data_in, | |
2142 | .queue_status = tcm_vhost_queue_status, | |
2143 | .queue_tm_rsp = tcm_vhost_queue_tm_rsp, | |
131e6abc | 2144 | .aborted_task = tcm_vhost_aborted_task, |
057cbf49 NB |
2145 | /* |
2146 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
2147 | */ | |
2148 | .fabric_make_wwn = tcm_vhost_make_tport, | |
2149 | .fabric_drop_wwn = tcm_vhost_drop_tport, | |
2150 | .fabric_make_tpg = tcm_vhost_make_tpg, | |
2151 | .fabric_drop_tpg = tcm_vhost_drop_tpg, | |
2152 | .fabric_post_link = tcm_vhost_port_link, | |
2153 | .fabric_pre_unlink = tcm_vhost_port_unlink, | |
2154 | .fabric_make_np = NULL, | |
2155 | .fabric_drop_np = NULL, | |
2156 | .fabric_make_nodeacl = tcm_vhost_make_nodeacl, | |
2157 | .fabric_drop_nodeacl = tcm_vhost_drop_nodeacl, | |
2158 | }; | |
2159 | ||
2160 | static int tcm_vhost_register_configfs(void) | |
2161 | { | |
2162 | struct target_fabric_configfs *fabric; | |
2163 | int ret; | |
2164 | ||
2165 | pr_debug("TCM_VHOST fabric module %s on %s/%s" | |
2166 | " on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname, | |
2167 | utsname()->machine); | |
2168 | /* | |
2169 | * Register the top level struct config_item_type with TCM core | |
2170 | */ | |
2171 | fabric = target_fabric_configfs_init(THIS_MODULE, "vhost"); | |
2172 | if (IS_ERR(fabric)) { | |
2173 | pr_err("target_fabric_configfs_init() failed\n"); | |
2174 | return PTR_ERR(fabric); | |
2175 | } | |
2176 | /* | |
2177 | * Setup fabric->tf_ops from our local tcm_vhost_ops | |
2178 | */ | |
2179 | fabric->tf_ops = tcm_vhost_ops; | |
2180 | /* | |
2181 | * Setup default attribute lists for various fabric->tf_cit_tmpl | |
2182 | */ | |
d80e224d AG |
2183 | fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs; |
2184 | fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs; | |
2185 | fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL; | |
2186 | fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL; | |
2187 | fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL; | |
2188 | fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL; | |
2189 | fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL; | |
2190 | fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL; | |
2191 | fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL; | |
057cbf49 NB |
2192 | /* |
2193 | * Register the fabric for use within TCM | |
2194 | */ | |
2195 | ret = target_fabric_configfs_register(fabric); | |
2196 | if (ret < 0) { | |
2197 | pr_err("target_fabric_configfs_register() failed" | |
2198 | " for TCM_VHOST\n"); | |
2199 | return ret; | |
2200 | } | |
2201 | /* | |
2202 | * Setup our local pointer to *fabric | |
2203 | */ | |
2204 | tcm_vhost_fabric_configfs = fabric; | |
2205 | pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n"); | |
2206 | return 0; | |
2207 | }; | |
2208 | ||
2209 | static void tcm_vhost_deregister_configfs(void) | |
2210 | { | |
2211 | if (!tcm_vhost_fabric_configfs) | |
2212 | return; | |
2213 | ||
2214 | target_fabric_configfs_deregister(tcm_vhost_fabric_configfs); | |
2215 | tcm_vhost_fabric_configfs = NULL; | |
2216 | pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n"); | |
2217 | }; | |
2218 | ||
2219 | static int __init tcm_vhost_init(void) | |
2220 | { | |
2221 | int ret = -ENOMEM; | |
101998f6 NB |
2222 | /* |
2223 | * Use our own dedicated workqueue for submitting I/O into | |
2224 | * target core to avoid contention within system_wq. | |
2225 | */ | |
057cbf49 NB |
2226 | tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0); |
2227 | if (!tcm_vhost_workqueue) | |
2228 | goto out; | |
2229 | ||
2230 | ret = vhost_scsi_register(); | |
2231 | if (ret < 0) | |
2232 | goto out_destroy_workqueue; | |
2233 | ||
2234 | ret = tcm_vhost_register_configfs(); | |
2235 | if (ret < 0) | |
2236 | goto out_vhost_scsi_deregister; | |
2237 | ||
2238 | return 0; | |
2239 | ||
2240 | out_vhost_scsi_deregister: | |
2241 | vhost_scsi_deregister(); | |
2242 | out_destroy_workqueue: | |
2243 | destroy_workqueue(tcm_vhost_workqueue); | |
2244 | out: | |
2245 | return ret; | |
2246 | }; | |
2247 | ||
2248 | static void tcm_vhost_exit(void) | |
2249 | { | |
2250 | tcm_vhost_deregister_configfs(); | |
2251 | vhost_scsi_deregister(); | |
2252 | destroy_workqueue(tcm_vhost_workqueue); | |
2253 | }; | |
2254 | ||
181c04a3 MT |
2255 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
2256 | MODULE_ALIAS("tcm_vhost"); | |
057cbf49 NB |
2257 | MODULE_LICENSE("GPL"); |
2258 | module_init(tcm_vhost_init); | |
2259 | module_exit(tcm_vhost_exit); |