aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/vhost/tcm_vhost.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/vhost/tcm_vhost.c')
-rw-r--r--drivers/vhost/tcm_vhost.c1628
1 files changed, 1628 insertions, 0 deletions
diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
new file mode 100644
index 000000000000..fb366540ed54
--- /dev/null
+++ b/drivers/vhost/tcm_vhost.c
@@ -0,0 +1,1628 @@
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>
37#include <linux/vhost.h>
38#include <linux/fs.h>
39#include <linux/miscdevice.h>
40#include <asm/unaligned.h>
41#include <scsi/scsi.h>
42#include <scsi/scsi_tcq.h>
43#include <target/target_core_base.h>
44#include <target/target_core_fabric.h>
45#include <target/target_core_fabric_configfs.h>
46#include <target/target_core_configfs.h>
47#include <target/configfs_macros.h>
48#include <linux/vhost.h>
49#include <linux/virtio_net.h> /* TODO vhost.h currently depends on this */
50#include <linux/virtio_scsi.h>
51
52#include "vhost.c"
53#include "vhost.h"
54#include "tcm_vhost.h"
55
56struct vhost_scsi {
57 atomic_t vhost_ref_cnt;
58 struct tcm_vhost_tpg *vs_tpg;
59 struct vhost_dev dev;
60 struct vhost_virtqueue vqs[3];
61
62 struct vhost_work vs_completion_work; /* cmd completion work item */
63 struct list_head vs_completion_list; /* cmd completion queue */
64 spinlock_t vs_completion_lock; /* protects s_completion_list */
65};
66
67/* Local pointer to allocated TCM configfs fabric module */
68static struct target_fabric_configfs *tcm_vhost_fabric_configfs;
69
70static struct workqueue_struct *tcm_vhost_workqueue;
71
72/* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */
73static DEFINE_MUTEX(tcm_vhost_mutex);
74static LIST_HEAD(tcm_vhost_list);
75
76static int tcm_vhost_check_true(struct se_portal_group *se_tpg)
77{
78 return 1;
79}
80
81static int tcm_vhost_check_false(struct se_portal_group *se_tpg)
82{
83 return 0;
84}
85
86static char *tcm_vhost_get_fabric_name(void)
87{
88 return "vhost";
89}
90
91static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg)
92{
93 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
94 struct tcm_vhost_tpg, se_tpg);
95 struct tcm_vhost_tport *tport = tpg->tport;
96
97 switch (tport->tport_proto_id) {
98 case SCSI_PROTOCOL_SAS:
99 return sas_get_fabric_proto_ident(se_tpg);
100 case SCSI_PROTOCOL_FCP:
101 return fc_get_fabric_proto_ident(se_tpg);
102 case SCSI_PROTOCOL_ISCSI:
103 return iscsi_get_fabric_proto_ident(se_tpg);
104 default:
105 pr_err("Unknown tport_proto_id: 0x%02x, using"
106 " SAS emulation\n", tport->tport_proto_id);
107 break;
108 }
109
110 return sas_get_fabric_proto_ident(se_tpg);
111}
112
113static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg)
114{
115 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
116 struct tcm_vhost_tpg, se_tpg);
117 struct tcm_vhost_tport *tport = tpg->tport;
118
119 return &tport->tport_name[0];
120}
121
122static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg)
123{
124 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
125 struct tcm_vhost_tpg, se_tpg);
126 return tpg->tport_tpgt;
127}
128
129static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg)
130{
131 return 1;
132}
133
134static u32 tcm_vhost_get_pr_transport_id(
135 struct se_portal_group *se_tpg,
136 struct se_node_acl *se_nacl,
137 struct t10_pr_registration *pr_reg,
138 int *format_code,
139 unsigned char *buf)
140{
141 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
142 struct tcm_vhost_tpg, se_tpg);
143 struct tcm_vhost_tport *tport = tpg->tport;
144
145 switch (tport->tport_proto_id) {
146 case SCSI_PROTOCOL_SAS:
147 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
148 format_code, buf);
149 case SCSI_PROTOCOL_FCP:
150 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
151 format_code, buf);
152 case SCSI_PROTOCOL_ISCSI:
153 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
154 format_code, buf);
155 default:
156 pr_err("Unknown tport_proto_id: 0x%02x, using"
157 " SAS emulation\n", tport->tport_proto_id);
158 break;
159 }
160
161 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
162 format_code, buf);
163}
164
165static u32 tcm_vhost_get_pr_transport_id_len(
166 struct se_portal_group *se_tpg,
167 struct se_node_acl *se_nacl,
168 struct t10_pr_registration *pr_reg,
169 int *format_code)
170{
171 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
172 struct tcm_vhost_tpg, se_tpg);
173 struct tcm_vhost_tport *tport = tpg->tport;
174
175 switch (tport->tport_proto_id) {
176 case SCSI_PROTOCOL_SAS:
177 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
178 format_code);
179 case SCSI_PROTOCOL_FCP:
180 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
181 format_code);
182 case SCSI_PROTOCOL_ISCSI:
183 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
184 format_code);
185 default:
186 pr_err("Unknown tport_proto_id: 0x%02x, using"
187 " SAS emulation\n", tport->tport_proto_id);
188 break;
189 }
190
191 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
192 format_code);
193}
194
195static char *tcm_vhost_parse_pr_out_transport_id(
196 struct se_portal_group *se_tpg,
197 const char *buf,
198 u32 *out_tid_len,
199 char **port_nexus_ptr)
200{
201 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
202 struct tcm_vhost_tpg, se_tpg);
203 struct tcm_vhost_tport *tport = tpg->tport;
204
205 switch (tport->tport_proto_id) {
206 case SCSI_PROTOCOL_SAS:
207 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
208 port_nexus_ptr);
209 case SCSI_PROTOCOL_FCP:
210 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
211 port_nexus_ptr);
212 case SCSI_PROTOCOL_ISCSI:
213 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
214 port_nexus_ptr);
215 default:
216 pr_err("Unknown tport_proto_id: 0x%02x, using"
217 " SAS emulation\n", tport->tport_proto_id);
218 break;
219 }
220
221 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
222 port_nexus_ptr);
223}
224
225static struct se_node_acl *tcm_vhost_alloc_fabric_acl(
226 struct se_portal_group *se_tpg)
227{
228 struct tcm_vhost_nacl *nacl;
229
230 nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL);
231 if (!nacl) {
232 pr_err("Unable to alocate struct tcm_vhost_nacl\n");
233 return NULL;
234 }
235
236 return &nacl->se_node_acl;
237}
238
239static void tcm_vhost_release_fabric_acl(
240 struct se_portal_group *se_tpg,
241 struct se_node_acl *se_nacl)
242{
243 struct tcm_vhost_nacl *nacl = container_of(se_nacl,
244 struct tcm_vhost_nacl, se_node_acl);
245 kfree(nacl);
246}
247
248static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg)
249{
250 return 1;
251}
252
253static void tcm_vhost_release_cmd(struct se_cmd *se_cmd)
254{
255 return;
256}
257
258static int tcm_vhost_shutdown_session(struct se_session *se_sess)
259{
260 return 0;
261}
262
263static void tcm_vhost_close_session(struct se_session *se_sess)
264{
265 return;
266}
267
268static u32 tcm_vhost_sess_get_index(struct se_session *se_sess)
269{
270 return 0;
271}
272
273static int tcm_vhost_write_pending(struct se_cmd *se_cmd)
274{
275 /* Go ahead and process the write immediately */
276 target_execute_cmd(se_cmd);
277 return 0;
278}
279
280static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd)
281{
282 return 0;
283}
284
285static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl)
286{
287 return;
288}
289
290static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd)
291{
292 return 0;
293}
294
295static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd)
296{
297 return 0;
298}
299
300static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *);
301
302static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd)
303{
304 struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
305 struct tcm_vhost_cmd, tvc_se_cmd);
306 vhost_scsi_complete_cmd(tv_cmd);
307 return 0;
308}
309
310static int tcm_vhost_queue_status(struct se_cmd *se_cmd)
311{
312 struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
313 struct tcm_vhost_cmd, tvc_se_cmd);
314 vhost_scsi_complete_cmd(tv_cmd);
315 return 0;
316}
317
318static int tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd)
319{
320 return 0;
321}
322
323static u16 tcm_vhost_set_fabric_sense_len(struct se_cmd *se_cmd,
324 u32 sense_length)
325{
326 return 0;
327}
328
329static u16 tcm_vhost_get_fabric_sense_len(void)
330{
331 return 0;
332}
333
334static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd)
335{
336 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
337
338 /* TODO locking against target/backend threads? */
339 transport_generic_free_cmd(se_cmd, 1);
340
341 if (tv_cmd->tvc_sgl_count) {
342 u32 i;
343 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
344 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
345
346 kfree(tv_cmd->tvc_sgl);
347 }
348
349 kfree(tv_cmd);
350}
351
352/* Dequeue a command from the completion list */
353static struct tcm_vhost_cmd *vhost_scsi_get_cmd_from_completion(
354 struct vhost_scsi *vs)
355{
356 struct tcm_vhost_cmd *tv_cmd = NULL;
357
358 spin_lock_bh(&vs->vs_completion_lock);
359 if (list_empty(&vs->vs_completion_list)) {
360 spin_unlock_bh(&vs->vs_completion_lock);
361 return NULL;
362 }
363
364 list_for_each_entry(tv_cmd, &vs->vs_completion_list,
365 tvc_completion_list) {
366 list_del(&tv_cmd->tvc_completion_list);
367 break;
368 }
369 spin_unlock_bh(&vs->vs_completion_lock);
370 return tv_cmd;
371}
372
373/* Fill in status and signal that we are done processing this command
374 *
375 * This is scheduled in the vhost work queue so we are called with the owner
376 * process mm and can access the vring.
377 */
378static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
379{
380 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
381 vs_completion_work);
382 struct tcm_vhost_cmd *tv_cmd;
383
384 while ((tv_cmd = vhost_scsi_get_cmd_from_completion(vs)) != NULL) {
385 struct virtio_scsi_cmd_resp v_rsp;
386 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
387 int ret;
388
389 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
390 tv_cmd, se_cmd->residual_count, se_cmd->scsi_status);
391
392 memset(&v_rsp, 0, sizeof(v_rsp));
393 v_rsp.resid = se_cmd->residual_count;
394 /* TODO is status_qualifier field needed? */
395 v_rsp.status = se_cmd->scsi_status;
396 v_rsp.sense_len = se_cmd->scsi_sense_length;
397 memcpy(v_rsp.sense, tv_cmd->tvc_sense_buf,
398 v_rsp.sense_len);
399 ret = copy_to_user(tv_cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
400 if (likely(ret == 0))
401 vhost_add_used(&vs->vqs[2], tv_cmd->tvc_vq_desc, 0);
402 else
403 pr_err("Faulted on virtio_scsi_cmd_resp\n");
404
405 vhost_scsi_free_cmd(tv_cmd);
406 }
407
408 vhost_signal(&vs->dev, &vs->vqs[2]);
409}
410
411static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *tv_cmd)
412{
413 struct vhost_scsi *vs = tv_cmd->tvc_vhost;
414
415 pr_debug("%s tv_cmd %p\n", __func__, tv_cmd);
416
417 spin_lock_bh(&vs->vs_completion_lock);
418 list_add_tail(&tv_cmd->tvc_completion_list, &vs->vs_completion_list);
419 spin_unlock_bh(&vs->vs_completion_lock);
420
421 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
422}
423
424static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd(
425 struct tcm_vhost_tpg *tv_tpg,
426 struct virtio_scsi_cmd_req *v_req,
427 u32 exp_data_len,
428 int data_direction)
429{
430 struct tcm_vhost_cmd *tv_cmd;
431 struct tcm_vhost_nexus *tv_nexus;
432 struct se_portal_group *se_tpg = &tv_tpg->se_tpg;
433 struct se_session *se_sess;
434 struct se_cmd *se_cmd;
435 int sam_task_attr;
436
437 tv_nexus = tv_tpg->tpg_nexus;
438 if (!tv_nexus) {
439 pr_err("Unable to locate active struct tcm_vhost_nexus\n");
440 return ERR_PTR(-EIO);
441 }
442 se_sess = tv_nexus->tvn_se_sess;
443
444 tv_cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC);
445 if (!tv_cmd) {
446 pr_err("Unable to allocate struct tcm_vhost_cmd\n");
447 return ERR_PTR(-ENOMEM);
448 }
449 INIT_LIST_HEAD(&tv_cmd->tvc_completion_list);
450 tv_cmd->tvc_tag = v_req->tag;
451
452 se_cmd = &tv_cmd->tvc_se_cmd;
453 /*
454 * Locate the SAM Task Attr from virtio_scsi_cmd_req
455 */
456 sam_task_attr = v_req->task_attr;
457 /*
458 * Initialize struct se_cmd descriptor from TCM infrastructure
459 */
460 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, exp_data_len,
461 data_direction, sam_task_attr,
462 &tv_cmd->tvc_sense_buf[0]);
463
464#if 0 /* FIXME: vhost_scsi_allocate_cmd() BIDI operation */
465 if (bidi)
466 se_cmd->se_cmd_flags |= SCF_BIDI;
467#endif
468 return tv_cmd;
469}
470
471/*
472 * Map a user memory range into a scatterlist
473 *
474 * Returns the number of scatterlist entries used or -errno on error.
475 */
476static int vhost_scsi_map_to_sgl(struct scatterlist *sgl,
477 unsigned int sgl_count, void __user *ptr, size_t len, int write)
478{
479 struct scatterlist *sg = sgl;
480 unsigned int npages = 0;
481 int ret;
482
483 while (len > 0) {
484 struct page *page;
485 unsigned int offset = (uintptr_t)ptr & ~PAGE_MASK;
486 unsigned int nbytes = min_t(unsigned int,
487 PAGE_SIZE - offset, len);
488
489 if (npages == sgl_count) {
490 ret = -ENOBUFS;
491 goto err;
492 }
493
494 ret = get_user_pages_fast((unsigned long)ptr, 1, write, &page);
495 BUG_ON(ret == 0); /* we should either get our page or fail */
496 if (ret < 0)
497 goto err;
498
499 sg_set_page(sg, page, nbytes, offset);
500 ptr += nbytes;
501 len -= nbytes;
502 sg++;
503 npages++;
504 }
505 return npages;
506
507err:
508 /* Put pages that we hold */
509 for (sg = sgl; sg != &sgl[npages]; sg++)
510 put_page(sg_page(sg));
511 return ret;
512}
513
514static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd,
515 struct iovec *iov, unsigned int niov, int write)
516{
517 int ret;
518 unsigned int i;
519 u32 sgl_count;
520 struct scatterlist *sg;
521
522 /*
523 * Find out how long sglist needs to be
524 */
525 sgl_count = 0;
526 for (i = 0; i < niov; i++) {
527 sgl_count += (((uintptr_t)iov[i].iov_base + iov[i].iov_len +
528 PAGE_SIZE - 1) >> PAGE_SHIFT) -
529 ((uintptr_t)iov[i].iov_base >> PAGE_SHIFT);
530 }
531 /* TODO overflow checking */
532
533 sg = kmalloc(sizeof(tv_cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC);
534 if (!sg)
535 return -ENOMEM;
536 pr_debug("%s sg %p sgl_count %u is_err %ld\n", __func__,
537 sg, sgl_count, IS_ERR(sg));
538 sg_init_table(sg, sgl_count);
539
540 tv_cmd->tvc_sgl = sg;
541 tv_cmd->tvc_sgl_count = sgl_count;
542
543 pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count);
544 for (i = 0; i < niov; i++) {
545 ret = vhost_scsi_map_to_sgl(sg, sgl_count, iov[i].iov_base,
546 iov[i].iov_len, write);
547 if (ret < 0) {
548 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
549 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
550 kfree(tv_cmd->tvc_sgl);
551 tv_cmd->tvc_sgl = NULL;
552 tv_cmd->tvc_sgl_count = 0;
553 return ret;
554 }
555
556 sg += ret;
557 sgl_count -= ret;
558 }
559 return 0;
560}
561
562static void tcm_vhost_submission_work(struct work_struct *work)
563{
564 struct tcm_vhost_cmd *tv_cmd =
565 container_of(work, struct tcm_vhost_cmd, work);
566 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
567 struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL;
568 int rc, sg_no_bidi = 0;
569 /*
570 * Locate the struct se_lun pointer based on v_req->lun, and
571 * attach it to struct se_cmd
572 */
573 rc = transport_lookup_cmd_lun(&tv_cmd->tvc_se_cmd, tv_cmd->tvc_lun);
574 if (rc < 0) {
575 pr_err("Failed to look up lun: %d\n", tv_cmd->tvc_lun);
576 transport_send_check_condition_and_sense(&tv_cmd->tvc_se_cmd,
577 tv_cmd->tvc_se_cmd.scsi_sense_reason, 0);
578 transport_generic_free_cmd(se_cmd, 0);
579 return;
580 }
581
582 rc = target_setup_cmd_from_cdb(se_cmd, tv_cmd->tvc_cdb);
583 if (rc == -ENOMEM) {
584 transport_send_check_condition_and_sense(se_cmd,
585 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
586 transport_generic_free_cmd(se_cmd, 0);
587 return;
588 } else if (rc < 0) {
589 if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
590 tcm_vhost_queue_status(se_cmd);
591 else
592 transport_send_check_condition_and_sense(se_cmd,
593 se_cmd->scsi_sense_reason, 0);
594 transport_generic_free_cmd(se_cmd, 0);
595 return;
596 }
597
598 if (tv_cmd->tvc_sgl_count) {
599 sg_ptr = tv_cmd->tvc_sgl;
600 /*
601 * For BIDI commands, pass in the extra READ buffer
602 * to transport_generic_map_mem_to_cmd() below..
603 */
604/* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */
605#if 0
606 if (se_cmd->se_cmd_flags & SCF_BIDI) {
607 sg_bidi_ptr = NULL;
608 sg_no_bidi = 0;
609 }
610#endif
611 } else {
612 sg_ptr = NULL;
613 }
614
615 rc = transport_generic_map_mem_to_cmd(se_cmd, sg_ptr,
616 tv_cmd->tvc_sgl_count, sg_bidi_ptr,
617 sg_no_bidi);
618 if (rc < 0) {
619 transport_send_check_condition_and_sense(se_cmd,
620 se_cmd->scsi_sense_reason, 0);
621 transport_generic_free_cmd(se_cmd, 0);
622 return;
623 }
624 transport_handle_cdb_direct(se_cmd);
625}
626
627static void vhost_scsi_handle_vq(struct vhost_scsi *vs)
628{
629 struct vhost_virtqueue *vq = &vs->vqs[2];
630 struct virtio_scsi_cmd_req v_req;
631 struct tcm_vhost_tpg *tv_tpg;
632 struct tcm_vhost_cmd *tv_cmd;
633 u32 exp_data_len, data_first, data_num, data_direction;
634 unsigned out, in, i;
635 int head, ret;
636
637 /* Must use ioctl VHOST_SCSI_SET_ENDPOINT */
638 tv_tpg = vs->vs_tpg;
639 if (unlikely(!tv_tpg)) {
640 pr_err("%s endpoint not set\n", __func__);
641 return;
642 }
643
644 mutex_lock(&vq->mutex);
645 vhost_disable_notify(&vs->dev, vq);
646
647 for (;;) {
648 head = vhost_get_vq_desc(&vs->dev, vq, vq->iov,
649 ARRAY_SIZE(vq->iov), &out, &in,
650 NULL, NULL);
651 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
652 head, out, in);
653 /* On error, stop handling until the next kick. */
654 if (unlikely(head < 0))
655 break;
656 /* Nothing new? Wait for eventfd to tell us they refilled. */
657 if (head == vq->num) {
658 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
659 vhost_disable_notify(&vs->dev, vq);
660 continue;
661 }
662 break;
663 }
664
665/* FIXME: BIDI operation */
666 if (out == 1 && in == 1) {
667 data_direction = DMA_NONE;
668 data_first = 0;
669 data_num = 0;
670 } else if (out == 1 && in > 1) {
671 data_direction = DMA_FROM_DEVICE;
672 data_first = out + 1;
673 data_num = in - 1;
674 } else if (out > 1 && in == 1) {
675 data_direction = DMA_TO_DEVICE;
676 data_first = 1;
677 data_num = out - 1;
678 } else {
679 vq_err(vq, "Invalid buffer layout out: %u in: %u\n",
680 out, in);
681 break;
682 }
683
684 /*
685 * Check for a sane resp buffer so we can report errors to
686 * the guest.
687 */
688 if (unlikely(vq->iov[out].iov_len !=
689 sizeof(struct virtio_scsi_cmd_resp))) {
690 vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
691 " bytes\n", vq->iov[out].iov_len);
692 break;
693 }
694
695 if (unlikely(vq->iov[0].iov_len != sizeof(v_req))) {
696 vq_err(vq, "Expecting virtio_scsi_cmd_req, got %zu"
697 " bytes\n", vq->iov[0].iov_len);
698 break;
699 }
700 pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p,"
701 " len: %zu\n", vq->iov[0].iov_base, sizeof(v_req));
702 ret = __copy_from_user(&v_req, vq->iov[0].iov_base,
703 sizeof(v_req));
704 if (unlikely(ret)) {
705 vq_err(vq, "Faulted on virtio_scsi_cmd_req\n");
706 break;
707 }
708
709 exp_data_len = 0;
710 for (i = 0; i < data_num; i++)
711 exp_data_len += vq->iov[data_first + i].iov_len;
712
713 tv_cmd = vhost_scsi_allocate_cmd(tv_tpg, &v_req,
714 exp_data_len, data_direction);
715 if (IS_ERR(tv_cmd)) {
716 vq_err(vq, "vhost_scsi_allocate_cmd failed %ld\n",
717 PTR_ERR(tv_cmd));
718 break;
719 }
720 pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
721 ": %d\n", tv_cmd, exp_data_len, data_direction);
722
723 tv_cmd->tvc_vhost = vs;
724
725 if (unlikely(vq->iov[out].iov_len !=
726 sizeof(struct virtio_scsi_cmd_resp))) {
727 vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
728 " bytes, out: %d, in: %d\n",
729 vq->iov[out].iov_len, out, in);
730 break;
731 }
732
733 tv_cmd->tvc_resp = vq->iov[out].iov_base;
734
735 /*
736 * Copy in the recieved CDB descriptor into tv_cmd->tvc_cdb
737 * that will be used by tcm_vhost_new_cmd_map() and down into
738 * target_setup_cmd_from_cdb()
739 */
740 memcpy(tv_cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE);
741 /*
742 * Check that the recieved CDB size does not exceeded our
743 * hardcoded max for tcm_vhost
744 */
745 /* TODO what if cdb was too small for varlen cdb header? */
746 if (unlikely(scsi_command_size(tv_cmd->tvc_cdb) >
747 TCM_VHOST_MAX_CDB_SIZE)) {
748 vq_err(vq, "Received SCSI CDB with command_size: %d that"
749 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
750 scsi_command_size(tv_cmd->tvc_cdb),
751 TCM_VHOST_MAX_CDB_SIZE);
752 break; /* TODO */
753 }
754 tv_cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
755
756 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
757 tv_cmd->tvc_cdb[0], tv_cmd->tvc_lun);
758
759 if (data_direction != DMA_NONE) {
760 ret = vhost_scsi_map_iov_to_sgl(tv_cmd,
761 &vq->iov[data_first], data_num,
762 data_direction == DMA_TO_DEVICE);
763 if (unlikely(ret)) {
764 vq_err(vq, "Failed to map iov to sgl\n");
765 break; /* TODO */
766 }
767 }
768
769 /*
770 * Save the descriptor from vhost_get_vq_desc() to be used to
771 * complete the virtio-scsi request in TCM callback context via
772 * tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
773 */
774 tv_cmd->tvc_vq_desc = head;
775 /*
776 * Dispatch tv_cmd descriptor for cmwq execution in process
777 * context provided by tcm_vhost_workqueue. This also ensures
778 * tv_cmd is executed on the same kworker CPU as this vhost
779 * thread to gain positive L2 cache locality effects..
780 */
781 INIT_WORK(&tv_cmd->work, tcm_vhost_submission_work);
782 queue_work(tcm_vhost_workqueue, &tv_cmd->work);
783 }
784
785 mutex_unlock(&vq->mutex);
786}
787
788static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
789{
790 pr_err("%s: The handling func for control queue.\n", __func__);
791}
792
793static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
794{
795 pr_err("%s: The handling func for event queue.\n", __func__);
796}
797
798static void vhost_scsi_handle_kick(struct vhost_work *work)
799{
800 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
801 poll.work);
802 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
803
804 vhost_scsi_handle_vq(vs);
805}
806
807/*
808 * Called from vhost_scsi_ioctl() context to walk the list of available
809 * tcm_vhost_tpg with an active struct tcm_vhost_nexus
810 */
811static int vhost_scsi_set_endpoint(
812 struct vhost_scsi *vs,
813 struct vhost_scsi_target *t)
814{
815 struct tcm_vhost_tport *tv_tport;
816 struct tcm_vhost_tpg *tv_tpg;
817 int index;
818
819 mutex_lock(&vs->dev.mutex);
820 /* Verify that ring has been setup correctly. */
821 for (index = 0; index < vs->dev.nvqs; ++index) {
822 /* Verify that ring has been setup correctly. */
823 if (!vhost_vq_access_ok(&vs->vqs[index])) {
824 mutex_unlock(&vs->dev.mutex);
825 return -EFAULT;
826 }
827 }
828
829 if (vs->vs_tpg) {
830 mutex_unlock(&vs->dev.mutex);
831 return -EEXIST;
832 }
833 mutex_unlock(&vs->dev.mutex);
834
835 mutex_lock(&tcm_vhost_mutex);
836 list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) {
837 mutex_lock(&tv_tpg->tv_tpg_mutex);
838 if (!tv_tpg->tpg_nexus) {
839 mutex_unlock(&tv_tpg->tv_tpg_mutex);
840 continue;
841 }
842 if (atomic_read(&tv_tpg->tv_tpg_vhost_count)) {
843 mutex_unlock(&tv_tpg->tv_tpg_mutex);
844 continue;
845 }
846 tv_tport = tv_tpg->tport;
847
848 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn) &&
849 (tv_tpg->tport_tpgt == t->vhost_tpgt)) {
850 atomic_inc(&tv_tpg->tv_tpg_vhost_count);
851 smp_mb__after_atomic_inc();
852 mutex_unlock(&tv_tpg->tv_tpg_mutex);
853 mutex_unlock(&tcm_vhost_mutex);
854
855 mutex_lock(&vs->dev.mutex);
856 vs->vs_tpg = tv_tpg;
857 atomic_inc(&vs->vhost_ref_cnt);
858 smp_mb__after_atomic_inc();
859 mutex_unlock(&vs->dev.mutex);
860 return 0;
861 }
862 mutex_unlock(&tv_tpg->tv_tpg_mutex);
863 }
864 mutex_unlock(&tcm_vhost_mutex);
865 return -EINVAL;
866}
867
868static int vhost_scsi_clear_endpoint(
869 struct vhost_scsi *vs,
870 struct vhost_scsi_target *t)
871{
872 struct tcm_vhost_tport *tv_tport;
873 struct tcm_vhost_tpg *tv_tpg;
874 int index;
875
876 mutex_lock(&vs->dev.mutex);
877 /* Verify that ring has been setup correctly. */
878 for (index = 0; index < vs->dev.nvqs; ++index) {
879 if (!vhost_vq_access_ok(&vs->vqs[index])) {
880 mutex_unlock(&vs->dev.mutex);
881 return -EFAULT;
882 }
883 }
884
885 if (!vs->vs_tpg) {
886 mutex_unlock(&vs->dev.mutex);
887 return -ENODEV;
888 }
889 tv_tpg = vs->vs_tpg;
890 tv_tport = tv_tpg->tport;
891
892 if (strcmp(tv_tport->tport_name, t->vhost_wwpn) ||
893 (tv_tpg->tport_tpgt != t->vhost_tpgt)) {
894 mutex_unlock(&vs->dev.mutex);
895 pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu"
896 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
897 tv_tport->tport_name, tv_tpg->tport_tpgt,
898 t->vhost_wwpn, t->vhost_tpgt);
899 return -EINVAL;
900 }
901 atomic_dec(&tv_tpg->tv_tpg_vhost_count);
902 vs->vs_tpg = NULL;
903 mutex_unlock(&vs->dev.mutex);
904
905 return 0;
906}
907
908static int vhost_scsi_open(struct inode *inode, struct file *f)
909{
910 struct vhost_scsi *s;
911 int r;
912
913 s = kzalloc(sizeof(*s), GFP_KERNEL);
914 if (!s)
915 return -ENOMEM;
916
917 vhost_work_init(&s->vs_completion_work, vhost_scsi_complete_cmd_work);
918 INIT_LIST_HEAD(&s->vs_completion_list);
919 spin_lock_init(&s->vs_completion_lock);
920
921 s->vqs[0].handle_kick = vhost_scsi_ctl_handle_kick;
922 s->vqs[1].handle_kick = vhost_scsi_evt_handle_kick;
923 s->vqs[2].handle_kick = vhost_scsi_handle_kick;
924 r = vhost_dev_init(&s->dev, s->vqs, 3);
925 if (r < 0) {
926 kfree(s);
927 return r;
928 }
929
930 f->private_data = s;
931 return 0;
932}
933
934static int vhost_scsi_release(struct inode *inode, struct file *f)
935{
936 struct vhost_scsi *s = f->private_data;
937
938 if (s->vs_tpg && s->vs_tpg->tport) {
939 struct vhost_scsi_target backend;
940
941 memcpy(backend.vhost_wwpn, s->vs_tpg->tport->tport_name,
942 sizeof(backend.vhost_wwpn));
943 backend.vhost_tpgt = s->vs_tpg->tport_tpgt;
944 vhost_scsi_clear_endpoint(s, &backend);
945 }
946
947 vhost_dev_cleanup(&s->dev, false);
948 kfree(s);
949 return 0;
950}
951
952static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
953{
954 if (features & ~VHOST_FEATURES)
955 return -EOPNOTSUPP;
956
957 mutex_lock(&vs->dev.mutex);
958 if ((features & (1 << VHOST_F_LOG_ALL)) &&
959 !vhost_log_access_ok(&vs->dev)) {
960 mutex_unlock(&vs->dev.mutex);
961 return -EFAULT;
962 }
963 vs->dev.acked_features = features;
964 /* TODO possibly smp_wmb() and flush vqs */
965 mutex_unlock(&vs->dev.mutex);
966 return 0;
967}
968
969static long vhost_scsi_ioctl(struct file *f, unsigned int ioctl,
970 unsigned long arg)
971{
972 struct vhost_scsi *vs = f->private_data;
973 struct vhost_scsi_target backend;
974 void __user *argp = (void __user *)arg;
975 u64 __user *featurep = argp;
976 u64 features;
977 int r;
978
979 switch (ioctl) {
980 case VHOST_SCSI_SET_ENDPOINT:
981 if (copy_from_user(&backend, argp, sizeof backend))
982 return -EFAULT;
983
984 return vhost_scsi_set_endpoint(vs, &backend);
985 case VHOST_SCSI_CLEAR_ENDPOINT:
986 if (copy_from_user(&backend, argp, sizeof backend))
987 return -EFAULT;
988
989 return vhost_scsi_clear_endpoint(vs, &backend);
990 case VHOST_SCSI_GET_ABI_VERSION:
991 if (copy_from_user(&backend, argp, sizeof backend))
992 return -EFAULT;
993
994 backend.abi_version = VHOST_SCSI_ABI_VERSION;
995
996 if (copy_to_user(argp, &backend, sizeof backend))
997 return -EFAULT;
998 return 0;
999 case VHOST_GET_FEATURES:
1000 features = VHOST_FEATURES;
1001 if (copy_to_user(featurep, &features, sizeof features))
1002 return -EFAULT;
1003 return 0;
1004 case VHOST_SET_FEATURES:
1005 if (copy_from_user(&features, featurep, sizeof features))
1006 return -EFAULT;
1007 return vhost_scsi_set_features(vs, features);
1008 default:
1009 mutex_lock(&vs->dev.mutex);
1010 r = vhost_dev_ioctl(&vs->dev, ioctl, arg);
1011 mutex_unlock(&vs->dev.mutex);
1012 return r;
1013 }
1014}
1015
1016static const struct file_operations vhost_scsi_fops = {
1017 .owner = THIS_MODULE,
1018 .release = vhost_scsi_release,
1019 .unlocked_ioctl = vhost_scsi_ioctl,
1020 /* TODO compat ioctl? */
1021 .open = vhost_scsi_open,
1022 .llseek = noop_llseek,
1023};
1024
1025static struct miscdevice vhost_scsi_misc = {
1026 MISC_DYNAMIC_MINOR,
1027 "vhost-scsi",
1028 &vhost_scsi_fops,
1029};
1030
1031static int __init vhost_scsi_register(void)
1032{
1033 return misc_register(&vhost_scsi_misc);
1034}
1035
1036static int vhost_scsi_deregister(void)
1037{
1038 return misc_deregister(&vhost_scsi_misc);
1039}
1040
1041static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport)
1042{
1043 switch (tport->tport_proto_id) {
1044 case SCSI_PROTOCOL_SAS:
1045 return "SAS";
1046 case SCSI_PROTOCOL_FCP:
1047 return "FCP";
1048 case SCSI_PROTOCOL_ISCSI:
1049 return "iSCSI";
1050 default:
1051 break;
1052 }
1053
1054 return "Unknown";
1055}
1056
1057static int tcm_vhost_port_link(
1058 struct se_portal_group *se_tpg,
1059 struct se_lun *lun)
1060{
1061 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1062 struct tcm_vhost_tpg, se_tpg);
1063
1064 atomic_inc(&tv_tpg->tv_tpg_port_count);
1065 smp_mb__after_atomic_inc();
1066
1067 return 0;
1068}
1069
1070static void tcm_vhost_port_unlink(
1071 struct se_portal_group *se_tpg,
1072 struct se_lun *se_lun)
1073{
1074 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1075 struct tcm_vhost_tpg, se_tpg);
1076
1077 atomic_dec(&tv_tpg->tv_tpg_port_count);
1078 smp_mb__after_atomic_dec();
1079}
1080
1081static struct se_node_acl *tcm_vhost_make_nodeacl(
1082 struct se_portal_group *se_tpg,
1083 struct config_group *group,
1084 const char *name)
1085{
1086 struct se_node_acl *se_nacl, *se_nacl_new;
1087 struct tcm_vhost_nacl *nacl;
1088 u64 wwpn = 0;
1089 u32 nexus_depth;
1090
1091 /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1092 return ERR_PTR(-EINVAL); */
1093 se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg);
1094 if (!se_nacl_new)
1095 return ERR_PTR(-ENOMEM);
1096
1097 nexus_depth = 1;
1098 /*
1099 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1100 * when converting a NodeACL from demo mode -> explict
1101 */
1102 se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1103 name, nexus_depth);
1104 if (IS_ERR(se_nacl)) {
1105 tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new);
1106 return se_nacl;
1107 }
1108 /*
1109 * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN
1110 */
1111 nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl);
1112 nacl->iport_wwpn = wwpn;
1113
1114 return se_nacl;
1115}
1116
1117static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl)
1118{
1119 struct tcm_vhost_nacl *nacl = container_of(se_acl,
1120 struct tcm_vhost_nacl, se_node_acl);
1121 core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1122 kfree(nacl);
1123}
1124
1125static int tcm_vhost_make_nexus(
1126 struct tcm_vhost_tpg *tv_tpg,
1127 const char *name)
1128{
1129 struct se_portal_group *se_tpg;
1130 struct tcm_vhost_nexus *tv_nexus;
1131
1132 mutex_lock(&tv_tpg->tv_tpg_mutex);
1133 if (tv_tpg->tpg_nexus) {
1134 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1135 pr_debug("tv_tpg->tpg_nexus already exists\n");
1136 return -EEXIST;
1137 }
1138 se_tpg = &tv_tpg->se_tpg;
1139
1140 tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL);
1141 if (!tv_nexus) {
1142 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1143 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1144 return -ENOMEM;
1145 }
1146 /*
1147 * Initialize the struct se_session pointer
1148 */
1149 tv_nexus->tvn_se_sess = transport_init_session();
1150 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1151 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1152 kfree(tv_nexus);
1153 return -ENOMEM;
1154 }
1155 /*
1156 * Since we are running in 'demo mode' this call with generate a
1157 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1158 * the SCSI Initiator port name of the passed configfs group 'name'.
1159 */
1160 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1161 se_tpg, (unsigned char *)name);
1162 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1163 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1164 pr_debug("core_tpg_check_initiator_node_acl() failed"
1165 " for %s\n", name);
1166 transport_free_session(tv_nexus->tvn_se_sess);
1167 kfree(tv_nexus);
1168 return -ENOMEM;
1169 }
1170 /*
1171 * Now register the TCM vHost virtual I_T Nexus as active with the
1172 * call to __transport_register_session()
1173 */
1174 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1175 tv_nexus->tvn_se_sess, tv_nexus);
1176 tv_tpg->tpg_nexus = tv_nexus;
1177
1178 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1179 return 0;
1180}
1181
1182static int tcm_vhost_drop_nexus(
1183 struct tcm_vhost_tpg *tpg)
1184{
1185 struct se_session *se_sess;
1186 struct tcm_vhost_nexus *tv_nexus;
1187
1188 mutex_lock(&tpg->tv_tpg_mutex);
1189 tv_nexus = tpg->tpg_nexus;
1190 if (!tv_nexus) {
1191 mutex_unlock(&tpg->tv_tpg_mutex);
1192 return -ENODEV;
1193 }
1194
1195 se_sess = tv_nexus->tvn_se_sess;
1196 if (!se_sess) {
1197 mutex_unlock(&tpg->tv_tpg_mutex);
1198 return -ENODEV;
1199 }
1200
1201 if (atomic_read(&tpg->tv_tpg_port_count)) {
1202 mutex_unlock(&tpg->tv_tpg_mutex);
1203 pr_err("Unable to remove TCM_vHost I_T Nexus with"
1204 " active TPG port count: %d\n",
1205 atomic_read(&tpg->tv_tpg_port_count));
1206 return -EPERM;
1207 }
1208
1209 if (atomic_read(&tpg->tv_tpg_vhost_count)) {
1210 mutex_unlock(&tpg->tv_tpg_mutex);
1211 pr_err("Unable to remove TCM_vHost I_T Nexus with"
1212 " active TPG vhost count: %d\n",
1213 atomic_read(&tpg->tv_tpg_vhost_count));
1214 return -EPERM;
1215 }
1216
1217 pr_debug("TCM_vHost_ConfigFS: Removing I_T Nexus to emulated"
1218 " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport),
1219 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1220 /*
1221 * Release the SCSI I_T Nexus to the emulated vHost Target Port
1222 */
1223 transport_deregister_session(tv_nexus->tvn_se_sess);
1224 tpg->tpg_nexus = NULL;
1225 mutex_unlock(&tpg->tv_tpg_mutex);
1226
1227 kfree(tv_nexus);
1228 return 0;
1229}
1230
1231static ssize_t tcm_vhost_tpg_show_nexus(
1232 struct se_portal_group *se_tpg,
1233 char *page)
1234{
1235 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1236 struct tcm_vhost_tpg, se_tpg);
1237 struct tcm_vhost_nexus *tv_nexus;
1238 ssize_t ret;
1239
1240 mutex_lock(&tv_tpg->tv_tpg_mutex);
1241 tv_nexus = tv_tpg->tpg_nexus;
1242 if (!tv_nexus) {
1243 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1244 return -ENODEV;
1245 }
1246 ret = snprintf(page, PAGE_SIZE, "%s\n",
1247 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1248 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1249
1250 return ret;
1251}
1252
1253static ssize_t tcm_vhost_tpg_store_nexus(
1254 struct se_portal_group *se_tpg,
1255 const char *page,
1256 size_t count)
1257{
1258 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1259 struct tcm_vhost_tpg, se_tpg);
1260 struct tcm_vhost_tport *tport_wwn = tv_tpg->tport;
1261 unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr;
1262 int ret;
1263 /*
1264 * Shutdown the active I_T nexus if 'NULL' is passed..
1265 */
1266 if (!strncmp(page, "NULL", 4)) {
1267 ret = tcm_vhost_drop_nexus(tv_tpg);
1268 return (!ret) ? count : ret;
1269 }
1270 /*
1271 * Otherwise make sure the passed virtual Initiator port WWN matches
1272 * the fabric protocol_id set in tcm_vhost_make_tport(), and call
1273 * tcm_vhost_make_nexus().
1274 */
1275 if (strlen(page) >= TCM_VHOST_NAMELEN) {
1276 pr_err("Emulated NAA Sas Address: %s, exceeds"
1277 " max: %d\n", page, TCM_VHOST_NAMELEN);
1278 return -EINVAL;
1279 }
1280 snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page);
1281
1282 ptr = strstr(i_port, "naa.");
1283 if (ptr) {
1284 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1285 pr_err("Passed SAS Initiator Port %s does not"
1286 " match target port protoid: %s\n", i_port,
1287 tcm_vhost_dump_proto_id(tport_wwn));
1288 return -EINVAL;
1289 }
1290 port_ptr = &i_port[0];
1291 goto check_newline;
1292 }
1293 ptr = strstr(i_port, "fc.");
1294 if (ptr) {
1295 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1296 pr_err("Passed FCP Initiator Port %s does not"
1297 " match target port protoid: %s\n", i_port,
1298 tcm_vhost_dump_proto_id(tport_wwn));
1299 return -EINVAL;
1300 }
1301 port_ptr = &i_port[3]; /* Skip over "fc." */
1302 goto check_newline;
1303 }
1304 ptr = strstr(i_port, "iqn.");
1305 if (ptr) {
1306 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1307 pr_err("Passed iSCSI Initiator Port %s does not"
1308 " match target port protoid: %s\n", i_port,
1309 tcm_vhost_dump_proto_id(tport_wwn));
1310 return -EINVAL;
1311 }
1312 port_ptr = &i_port[0];
1313 goto check_newline;
1314 }
1315 pr_err("Unable to locate prefix for emulated Initiator Port:"
1316 " %s\n", i_port);
1317 return -EINVAL;
1318 /*
1319 * Clear any trailing newline for the NAA WWN
1320 */
1321check_newline:
1322 if (i_port[strlen(i_port)-1] == '\n')
1323 i_port[strlen(i_port)-1] = '\0';
1324
1325 ret = tcm_vhost_make_nexus(tv_tpg, port_ptr);
1326 if (ret < 0)
1327 return ret;
1328
1329 return count;
1330}
1331
1332TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR);
1333
1334static struct configfs_attribute *tcm_vhost_tpg_attrs[] = {
1335 &tcm_vhost_tpg_nexus.attr,
1336 NULL,
1337};
1338
1339static struct se_portal_group *tcm_vhost_make_tpg(
1340 struct se_wwn *wwn,
1341 struct config_group *group,
1342 const char *name)
1343{
1344 struct tcm_vhost_tport *tport = container_of(wwn,
1345 struct tcm_vhost_tport, tport_wwn);
1346
1347 struct tcm_vhost_tpg *tpg;
1348 unsigned long tpgt;
1349 int ret;
1350
1351 if (strstr(name, "tpgt_") != name)
1352 return ERR_PTR(-EINVAL);
1353 if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
1354 return ERR_PTR(-EINVAL);
1355
1356 tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL);
1357 if (!tpg) {
1358 pr_err("Unable to allocate struct tcm_vhost_tpg");
1359 return ERR_PTR(-ENOMEM);
1360 }
1361 mutex_init(&tpg->tv_tpg_mutex);
1362 INIT_LIST_HEAD(&tpg->tv_tpg_list);
1363 tpg->tport = tport;
1364 tpg->tport_tpgt = tpgt;
1365
1366 ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn,
1367 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
1368 if (ret < 0) {
1369 kfree(tpg);
1370 return NULL;
1371 }
1372 mutex_lock(&tcm_vhost_mutex);
1373 list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list);
1374 mutex_unlock(&tcm_vhost_mutex);
1375
1376 return &tpg->se_tpg;
1377}
1378
1379static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg)
1380{
1381 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
1382 struct tcm_vhost_tpg, se_tpg);
1383
1384 mutex_lock(&tcm_vhost_mutex);
1385 list_del(&tpg->tv_tpg_list);
1386 mutex_unlock(&tcm_vhost_mutex);
1387 /*
1388 * Release the virtual I_T Nexus for this vHost TPG
1389 */
1390 tcm_vhost_drop_nexus(tpg);
1391 /*
1392 * Deregister the se_tpg from TCM..
1393 */
1394 core_tpg_deregister(se_tpg);
1395 kfree(tpg);
1396}
1397
1398static struct se_wwn *tcm_vhost_make_tport(
1399 struct target_fabric_configfs *tf,
1400 struct config_group *group,
1401 const char *name)
1402{
1403 struct tcm_vhost_tport *tport;
1404 char *ptr;
1405 u64 wwpn = 0;
1406 int off = 0;
1407
1408 /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1409 return ERR_PTR(-EINVAL); */
1410
1411 tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL);
1412 if (!tport) {
1413 pr_err("Unable to allocate struct tcm_vhost_tport");
1414 return ERR_PTR(-ENOMEM);
1415 }
1416 tport->tport_wwpn = wwpn;
1417 /*
1418 * Determine the emulated Protocol Identifier and Target Port Name
1419 * based on the incoming configfs directory name.
1420 */
1421 ptr = strstr(name, "naa.");
1422 if (ptr) {
1423 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
1424 goto check_len;
1425 }
1426 ptr = strstr(name, "fc.");
1427 if (ptr) {
1428 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
1429 off = 3; /* Skip over "fc." */
1430 goto check_len;
1431 }
1432 ptr = strstr(name, "iqn.");
1433 if (ptr) {
1434 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
1435 goto check_len;
1436 }
1437
1438 pr_err("Unable to locate prefix for emulated Target Port:"
1439 " %s\n", name);
1440 kfree(tport);
1441 return ERR_PTR(-EINVAL);
1442
1443check_len:
1444 if (strlen(name) >= TCM_VHOST_NAMELEN) {
1445 pr_err("Emulated %s Address: %s, exceeds"
1446 " max: %d\n", name, tcm_vhost_dump_proto_id(tport),
1447 TCM_VHOST_NAMELEN);
1448 kfree(tport);
1449 return ERR_PTR(-EINVAL);
1450 }
1451 snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]);
1452
1453 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
1454 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name);
1455
1456 return &tport->tport_wwn;
1457}
1458
1459static void tcm_vhost_drop_tport(struct se_wwn *wwn)
1460{
1461 struct tcm_vhost_tport *tport = container_of(wwn,
1462 struct tcm_vhost_tport, tport_wwn);
1463
1464 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
1465 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport),
1466 tport->tport_name);
1467
1468 kfree(tport);
1469}
1470
1471static ssize_t tcm_vhost_wwn_show_attr_version(
1472 struct target_fabric_configfs *tf,
1473 char *page)
1474{
1475 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
1476 "on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
1477 utsname()->machine);
1478}
1479
1480TF_WWN_ATTR_RO(tcm_vhost, version);
1481
1482static struct configfs_attribute *tcm_vhost_wwn_attrs[] = {
1483 &tcm_vhost_wwn_version.attr,
1484 NULL,
1485};
1486
1487static struct target_core_fabric_ops tcm_vhost_ops = {
1488 .get_fabric_name = tcm_vhost_get_fabric_name,
1489 .get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident,
1490 .tpg_get_wwn = tcm_vhost_get_fabric_wwn,
1491 .tpg_get_tag = tcm_vhost_get_tag,
1492 .tpg_get_default_depth = tcm_vhost_get_default_depth,
1493 .tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id,
1494 .tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len,
1495 .tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id,
1496 .tpg_check_demo_mode = tcm_vhost_check_true,
1497 .tpg_check_demo_mode_cache = tcm_vhost_check_true,
1498 .tpg_check_demo_mode_write_protect = tcm_vhost_check_false,
1499 .tpg_check_prod_mode_write_protect = tcm_vhost_check_false,
1500 .tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl,
1501 .tpg_release_fabric_acl = tcm_vhost_release_fabric_acl,
1502 .tpg_get_inst_index = tcm_vhost_tpg_get_inst_index,
1503 .release_cmd = tcm_vhost_release_cmd,
1504 .shutdown_session = tcm_vhost_shutdown_session,
1505 .close_session = tcm_vhost_close_session,
1506 .sess_get_index = tcm_vhost_sess_get_index,
1507 .sess_get_initiator_sid = NULL,
1508 .write_pending = tcm_vhost_write_pending,
1509 .write_pending_status = tcm_vhost_write_pending_status,
1510 .set_default_node_attributes = tcm_vhost_set_default_node_attrs,
1511 .get_task_tag = tcm_vhost_get_task_tag,
1512 .get_cmd_state = tcm_vhost_get_cmd_state,
1513 .queue_data_in = tcm_vhost_queue_data_in,
1514 .queue_status = tcm_vhost_queue_status,
1515 .queue_tm_rsp = tcm_vhost_queue_tm_rsp,
1516 .get_fabric_sense_len = tcm_vhost_get_fabric_sense_len,
1517 .set_fabric_sense_len = tcm_vhost_set_fabric_sense_len,
1518 /*
1519 * Setup callers for generic logic in target_core_fabric_configfs.c
1520 */
1521 .fabric_make_wwn = tcm_vhost_make_tport,
1522 .fabric_drop_wwn = tcm_vhost_drop_tport,
1523 .fabric_make_tpg = tcm_vhost_make_tpg,
1524 .fabric_drop_tpg = tcm_vhost_drop_tpg,
1525 .fabric_post_link = tcm_vhost_port_link,
1526 .fabric_pre_unlink = tcm_vhost_port_unlink,
1527 .fabric_make_np = NULL,
1528 .fabric_drop_np = NULL,
1529 .fabric_make_nodeacl = tcm_vhost_make_nodeacl,
1530 .fabric_drop_nodeacl = tcm_vhost_drop_nodeacl,
1531};
1532
1533static int tcm_vhost_register_configfs(void)
1534{
1535 struct target_fabric_configfs *fabric;
1536 int ret;
1537
1538 pr_debug("TCM_VHOST fabric module %s on %s/%s"
1539 " on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
1540 utsname()->machine);
1541 /*
1542 * Register the top level struct config_item_type with TCM core
1543 */
1544 fabric = target_fabric_configfs_init(THIS_MODULE, "vhost");
1545 if (IS_ERR(fabric)) {
1546 pr_err("target_fabric_configfs_init() failed\n");
1547 return PTR_ERR(fabric);
1548 }
1549 /*
1550 * Setup fabric->tf_ops from our local tcm_vhost_ops
1551 */
1552 fabric->tf_ops = tcm_vhost_ops;
1553 /*
1554 * Setup default attribute lists for various fabric->tf_cit_tmpl
1555 */
1556 TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs;
1557 TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs;
1558 TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1559 TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1560 TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1561 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
1562 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
1563 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
1564 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
1565 /*
1566 * Register the fabric for use within TCM
1567 */
1568 ret = target_fabric_configfs_register(fabric);
1569 if (ret < 0) {
1570 pr_err("target_fabric_configfs_register() failed"
1571 " for TCM_VHOST\n");
1572 return ret;
1573 }
1574 /*
1575 * Setup our local pointer to *fabric
1576 */
1577 tcm_vhost_fabric_configfs = fabric;
1578 pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n");
1579 return 0;
1580};
1581
1582static void tcm_vhost_deregister_configfs(void)
1583{
1584 if (!tcm_vhost_fabric_configfs)
1585 return;
1586
1587 target_fabric_configfs_deregister(tcm_vhost_fabric_configfs);
1588 tcm_vhost_fabric_configfs = NULL;
1589 pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n");
1590};
1591
1592static int __init tcm_vhost_init(void)
1593{
1594 int ret = -ENOMEM;
1595
1596 tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0);
1597 if (!tcm_vhost_workqueue)
1598 goto out;
1599
1600 ret = vhost_scsi_register();
1601 if (ret < 0)
1602 goto out_destroy_workqueue;
1603
1604 ret = tcm_vhost_register_configfs();
1605 if (ret < 0)
1606 goto out_vhost_scsi_deregister;
1607
1608 return 0;
1609
1610out_vhost_scsi_deregister:
1611 vhost_scsi_deregister();
1612out_destroy_workqueue:
1613 destroy_workqueue(tcm_vhost_workqueue);
1614out:
1615 return ret;
1616};
1617
1618static void tcm_vhost_exit(void)
1619{
1620 tcm_vhost_deregister_configfs();
1621 vhost_scsi_deregister();
1622 destroy_workqueue(tcm_vhost_workqueue);
1623};
1624
1625MODULE_DESCRIPTION("TCM_VHOST series fabric driver");
1626MODULE_LICENSE("GPL");
1627module_init(tcm_vhost_init);
1628module_exit(tcm_vhost_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-19 03:09:56 -0500