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.c1649
1 files changed, 1649 insertions, 0 deletions
diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
new file mode 100644
index 000000000000..ed8e2e6c8df2
--- /dev/null
+++ b/drivers/vhost/tcm_vhost.c
@@ -0,0 +1,1649 @@
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
56enum {
57 VHOST_SCSI_VQ_CTL = 0,
58 VHOST_SCSI_VQ_EVT = 1,
59 VHOST_SCSI_VQ_IO = 2,
60};
61
62struct vhost_scsi {
63 struct tcm_vhost_tpg *vs_tpg; /* Protected by vhost_scsi->dev.mutex */
64 struct vhost_dev dev;
65 struct vhost_virtqueue vqs[3];
66
67 struct vhost_work vs_completion_work; /* cmd completion work item */
68 struct list_head vs_completion_list; /* cmd completion queue */
69 spinlock_t vs_completion_lock; /* protects s_completion_list */
70};
71
72/* Local pointer to allocated TCM configfs fabric module */
73static struct target_fabric_configfs *tcm_vhost_fabric_configfs;
74
75static struct workqueue_struct *tcm_vhost_workqueue;
76
77/* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */
78static DEFINE_MUTEX(tcm_vhost_mutex);
79static LIST_HEAD(tcm_vhost_list);
80
81static int tcm_vhost_check_true(struct se_portal_group *se_tpg)
82{
83 return 1;
84}
85
86static int tcm_vhost_check_false(struct se_portal_group *se_tpg)
87{
88 return 0;
89}
90
91static char *tcm_vhost_get_fabric_name(void)
92{
93 return "vhost";
94}
95
96static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg)
97{
98 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
99 struct tcm_vhost_tpg, se_tpg);
100 struct tcm_vhost_tport *tport = tpg->tport;
101
102 switch (tport->tport_proto_id) {
103 case SCSI_PROTOCOL_SAS:
104 return sas_get_fabric_proto_ident(se_tpg);
105 case SCSI_PROTOCOL_FCP:
106 return fc_get_fabric_proto_ident(se_tpg);
107 case SCSI_PROTOCOL_ISCSI:
108 return iscsi_get_fabric_proto_ident(se_tpg);
109 default:
110 pr_err("Unknown tport_proto_id: 0x%02x, using"
111 " SAS emulation\n", tport->tport_proto_id);
112 break;
113 }
114
115 return sas_get_fabric_proto_ident(se_tpg);
116}
117
118static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg)
119{
120 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
121 struct tcm_vhost_tpg, se_tpg);
122 struct tcm_vhost_tport *tport = tpg->tport;
123
124 return &tport->tport_name[0];
125}
126
127static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg)
128{
129 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
130 struct tcm_vhost_tpg, se_tpg);
131 return tpg->tport_tpgt;
132}
133
134static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg)
135{
136 return 1;
137}
138
139static u32 tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg,
140 struct se_node_acl *se_nacl,
141 struct t10_pr_registration *pr_reg,
142 int *format_code,
143 unsigned char *buf)
144{
145 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
146 struct tcm_vhost_tpg, se_tpg);
147 struct tcm_vhost_tport *tport = tpg->tport;
148
149 switch (tport->tport_proto_id) {
150 case SCSI_PROTOCOL_SAS:
151 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
152 format_code, buf);
153 case SCSI_PROTOCOL_FCP:
154 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
155 format_code, buf);
156 case SCSI_PROTOCOL_ISCSI:
157 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
158 format_code, buf);
159 default:
160 pr_err("Unknown tport_proto_id: 0x%02x, using"
161 " SAS emulation\n", tport->tport_proto_id);
162 break;
163 }
164
165 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
166 format_code, buf);
167}
168
169static u32 tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg,
170 struct se_node_acl *se_nacl,
171 struct t10_pr_registration *pr_reg,
172 int *format_code)
173{
174 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
175 struct tcm_vhost_tpg, se_tpg);
176 struct tcm_vhost_tport *tport = tpg->tport;
177
178 switch (tport->tport_proto_id) {
179 case SCSI_PROTOCOL_SAS:
180 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
181 format_code);
182 case SCSI_PROTOCOL_FCP:
183 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
184 format_code);
185 case SCSI_PROTOCOL_ISCSI:
186 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
187 format_code);
188 default:
189 pr_err("Unknown tport_proto_id: 0x%02x, using"
190 " SAS emulation\n", tport->tport_proto_id);
191 break;
192 }
193
194 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
195 format_code);
196}
197
198static char *tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
199 const char *buf,
200 u32 *out_tid_len,
201 char **port_nexus_ptr)
202{
203 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
204 struct tcm_vhost_tpg, se_tpg);
205 struct tcm_vhost_tport *tport = tpg->tport;
206
207 switch (tport->tport_proto_id) {
208 case SCSI_PROTOCOL_SAS:
209 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
210 port_nexus_ptr);
211 case SCSI_PROTOCOL_FCP:
212 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
213 port_nexus_ptr);
214 case SCSI_PROTOCOL_ISCSI:
215 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
216 port_nexus_ptr);
217 default:
218 pr_err("Unknown tport_proto_id: 0x%02x, using"
219 " SAS emulation\n", tport->tport_proto_id);
220 break;
221 }
222
223 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
224 port_nexus_ptr);
225}
226
227static struct se_node_acl *tcm_vhost_alloc_fabric_acl(
228 struct se_portal_group *se_tpg)
229{
230 struct tcm_vhost_nacl *nacl;
231
232 nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL);
233 if (!nacl) {
234 pr_err("Unable to alocate struct tcm_vhost_nacl\n");
235 return NULL;
236 }
237
238 return &nacl->se_node_acl;
239}
240
241static void tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg,
242 struct se_node_acl *se_nacl)
243{
244 struct tcm_vhost_nacl *nacl = container_of(se_nacl,
245 struct tcm_vhost_nacl, se_node_acl);
246 kfree(nacl);
247}
248
249static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg)
250{
251 return 1;
252}
253
254static void tcm_vhost_release_cmd(struct se_cmd *se_cmd)
255{
256 return;
257}
258
259static int tcm_vhost_shutdown_session(struct se_session *se_sess)
260{
261 return 0;
262}
263
264static void tcm_vhost_close_session(struct se_session *se_sess)
265{
266 return;
267}
268
269static u32 tcm_vhost_sess_get_index(struct se_session *se_sess)
270{
271 return 0;
272}
273
274static int tcm_vhost_write_pending(struct se_cmd *se_cmd)
275{
276 /* Go ahead and process the write immediately */
277 target_execute_cmd(se_cmd);
278 return 0;
279}
280
281static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd)
282{
283 return 0;
284}
285
286static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl)
287{
288 return;
289}
290
291static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd)
292{
293 return 0;
294}
295
296static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd)
297{
298 return 0;
299}
300
301static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *tv_cmd)
302{
303 struct vhost_scsi *vs = tv_cmd->tvc_vhost;
304
305 spin_lock_bh(&vs->vs_completion_lock);
306 list_add_tail(&tv_cmd->tvc_completion_list, &vs->vs_completion_list);
307 spin_unlock_bh(&vs->vs_completion_lock);
308
309 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
310}
311
312static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd)
313{
314 struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
315 struct tcm_vhost_cmd, tvc_se_cmd);
316 vhost_scsi_complete_cmd(tv_cmd);
317 return 0;
318}
319
320static int tcm_vhost_queue_status(struct se_cmd *se_cmd)
321{
322 struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
323 struct tcm_vhost_cmd, tvc_se_cmd);
324 vhost_scsi_complete_cmd(tv_cmd);
325 return 0;
326}
327
328static int tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd)
329{
330 return 0;
331}
332
333static u16 tcm_vhost_set_fabric_sense_len(struct se_cmd *se_cmd,
334 u32 sense_length)
335{
336 return 0;
337}
338
339static u16 tcm_vhost_get_fabric_sense_len(void)
340{
341 return 0;
342}
343
344static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd)
345{
346 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
347
348 /* TODO locking against target/backend threads? */
349 transport_generic_free_cmd(se_cmd, 1);
350
351 if (tv_cmd->tvc_sgl_count) {
352 u32 i;
353 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
354 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
355
356 kfree(tv_cmd->tvc_sgl);
357 }
358
359 kfree(tv_cmd);
360}
361
362/* Dequeue a command from the completion list */
363static struct tcm_vhost_cmd *vhost_scsi_get_cmd_from_completion(
364 struct vhost_scsi *vs)
365{
366 struct tcm_vhost_cmd *tv_cmd = NULL;
367
368 spin_lock_bh(&vs->vs_completion_lock);
369 if (list_empty(&vs->vs_completion_list)) {
370 spin_unlock_bh(&vs->vs_completion_lock);
371 return NULL;
372 }
373
374 list_for_each_entry(tv_cmd, &vs->vs_completion_list,
375 tvc_completion_list) {
376 list_del(&tv_cmd->tvc_completion_list);
377 break;
378 }
379 spin_unlock_bh(&vs->vs_completion_lock);
380 return tv_cmd;
381}
382
383/* Fill in status and signal that we are done processing this command
384 *
385 * This is scheduled in the vhost work queue so we are called with the owner
386 * process mm and can access the vring.
387 */
388static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
389{
390 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
391 vs_completion_work);
392 struct tcm_vhost_cmd *tv_cmd;
393
394 while ((tv_cmd = vhost_scsi_get_cmd_from_completion(vs))) {
395 struct virtio_scsi_cmd_resp v_rsp;
396 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
397 int ret;
398
399 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
400 tv_cmd, se_cmd->residual_count, se_cmd->scsi_status);
401
402 memset(&v_rsp, 0, sizeof(v_rsp));
403 v_rsp.resid = se_cmd->residual_count;
404 /* TODO is status_qualifier field needed? */
405 v_rsp.status = se_cmd->scsi_status;
406 v_rsp.sense_len = se_cmd->scsi_sense_length;
407 memcpy(v_rsp.sense, tv_cmd->tvc_sense_buf,
408 v_rsp.sense_len);
409 ret = copy_to_user(tv_cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
410 if (likely(ret == 0))
411 vhost_add_used(&vs->vqs[2], tv_cmd->tvc_vq_desc, 0);
412 else
413 pr_err("Faulted on virtio_scsi_cmd_resp\n");
414
415 vhost_scsi_free_cmd(tv_cmd);
416 }
417
418 vhost_signal(&vs->dev, &vs->vqs[2]);
419}
420
421static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd(
422 struct tcm_vhost_tpg *tv_tpg,
423 struct virtio_scsi_cmd_req *v_req,
424 u32 exp_data_len,
425 int data_direction)
426{
427 struct tcm_vhost_cmd *tv_cmd;
428 struct tcm_vhost_nexus *tv_nexus;
429 struct se_portal_group *se_tpg = &tv_tpg->se_tpg;
430 struct se_session *se_sess;
431 struct se_cmd *se_cmd;
432 int sam_task_attr;
433
434 tv_nexus = tv_tpg->tpg_nexus;
435 if (!tv_nexus) {
436 pr_err("Unable to locate active struct tcm_vhost_nexus\n");
437 return ERR_PTR(-EIO);
438 }
439 se_sess = tv_nexus->tvn_se_sess;
440
441 tv_cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC);
442 if (!tv_cmd) {
443 pr_err("Unable to allocate struct tcm_vhost_cmd\n");
444 return ERR_PTR(-ENOMEM);
445 }
446 INIT_LIST_HEAD(&tv_cmd->tvc_completion_list);
447 tv_cmd->tvc_tag = v_req->tag;
448
449 se_cmd = &tv_cmd->tvc_se_cmd;
450 /*
451 * Locate the SAM Task Attr from virtio_scsi_cmd_req
452 */
453 sam_task_attr = v_req->task_attr;
454 /*
455 * Initialize struct se_cmd descriptor from TCM infrastructure
456 */
457 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, exp_data_len,
458 data_direction, sam_task_attr,
459 &tv_cmd->tvc_sense_buf[0]);
460
461#if 0 /* FIXME: vhost_scsi_allocate_cmd() BIDI operation */
462 if (bidi)
463 se_cmd->se_cmd_flags |= SCF_BIDI;
464#endif
465 return tv_cmd;
466}
467
468/*
469 * Map a user memory range into a scatterlist
470 *
471 * Returns the number of scatterlist entries used or -errno on error.
472 */
473static int vhost_scsi_map_to_sgl(struct scatterlist *sgl,
474 unsigned int sgl_count, void __user *ptr, size_t len, int write)
475{
476 struct scatterlist *sg = sgl;
477 unsigned int npages = 0;
478 int ret;
479
480 while (len > 0) {
481 struct page *page;
482 unsigned int offset = (uintptr_t)ptr & ~PAGE_MASK;
483 unsigned int nbytes = min_t(unsigned int,
484 PAGE_SIZE - offset, len);
485
486 if (npages == sgl_count) {
487 ret = -ENOBUFS;
488 goto err;
489 }
490
491 ret = get_user_pages_fast((unsigned long)ptr, 1, write, &page);
492 BUG_ON(ret == 0); /* we should either get our page or fail */
493 if (ret < 0)
494 goto err;
495
496 sg_set_page(sg, page, nbytes, offset);
497 ptr += nbytes;
498 len -= nbytes;
499 sg++;
500 npages++;
501 }
502 return npages;
503
504err:
505 /* Put pages that we hold */
506 for (sg = sgl; sg != &sgl[npages]; sg++)
507 put_page(sg_page(sg));
508 return ret;
509}
510
511static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd,
512 struct iovec *iov, unsigned int niov, int write)
513{
514 int ret;
515 unsigned int i;
516 u32 sgl_count;
517 struct scatterlist *sg;
518
519 /*
520 * Find out how long sglist needs to be
521 */
522 sgl_count = 0;
523 for (i = 0; i < niov; i++) {
524 sgl_count += (((uintptr_t)iov[i].iov_base + iov[i].iov_len +
525 PAGE_SIZE - 1) >> PAGE_SHIFT) -
526 ((uintptr_t)iov[i].iov_base >> PAGE_SHIFT);
527 }
528 /* TODO overflow checking */
529
530 sg = kmalloc(sizeof(tv_cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC);
531 if (!sg)
532 return -ENOMEM;
533 pr_debug("%s sg %p sgl_count %u is_err %d\n", __func__,
534 sg, sgl_count, !sg);
535 sg_init_table(sg, sgl_count);
536
537 tv_cmd->tvc_sgl = sg;
538 tv_cmd->tvc_sgl_count = sgl_count;
539
540 pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count);
541 for (i = 0; i < niov; i++) {
542 ret = vhost_scsi_map_to_sgl(sg, sgl_count, iov[i].iov_base,
543 iov[i].iov_len, write);
544 if (ret < 0) {
545 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
546 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
547 kfree(tv_cmd->tvc_sgl);
548 tv_cmd->tvc_sgl = NULL;
549 tv_cmd->tvc_sgl_count = 0;
550 return ret;
551 }
552
553 sg += ret;
554 sgl_count -= ret;
555 }
556 return 0;
557}
558
559static void tcm_vhost_submission_work(struct work_struct *work)
560{
561 struct tcm_vhost_cmd *tv_cmd =
562 container_of(work, struct tcm_vhost_cmd, work);
563 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
564 struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL;
565 int rc, sg_no_bidi = 0;
566 /*
567 * Locate the struct se_lun pointer based on v_req->lun, and
568 * attach it to struct se_cmd
569 */
570 rc = transport_lookup_cmd_lun(&tv_cmd->tvc_se_cmd, tv_cmd->tvc_lun);
571 if (rc < 0) {
572 pr_err("Failed to look up lun: %d\n", tv_cmd->tvc_lun);
573 transport_send_check_condition_and_sense(&tv_cmd->tvc_se_cmd,
574 tv_cmd->tvc_se_cmd.scsi_sense_reason, 0);
575 transport_generic_free_cmd(se_cmd, 0);
576 return;
577 }
578
579 rc = target_setup_cmd_from_cdb(se_cmd, tv_cmd->tvc_cdb);
580 if (rc == -ENOMEM) {
581 transport_send_check_condition_and_sense(se_cmd,
582 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
583 transport_generic_free_cmd(se_cmd, 0);
584 return;
585 } else if (rc < 0) {
586 if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
587 tcm_vhost_queue_status(se_cmd);
588 else
589 transport_send_check_condition_and_sense(se_cmd,
590 se_cmd->scsi_sense_reason, 0);
591 transport_generic_free_cmd(se_cmd, 0);
592 return;
593 }
594
595 if (tv_cmd->tvc_sgl_count) {
596 sg_ptr = tv_cmd->tvc_sgl;
597 /*
598 * For BIDI commands, pass in the extra READ buffer
599 * to transport_generic_map_mem_to_cmd() below..
600 */
601/* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */
602#if 0
603 if (se_cmd->se_cmd_flags & SCF_BIDI) {
604 sg_bidi_ptr = NULL;
605 sg_no_bidi = 0;
606 }
607#endif
608 } else {
609 sg_ptr = NULL;
610 }
611
612 rc = transport_generic_map_mem_to_cmd(se_cmd, sg_ptr,
613 tv_cmd->tvc_sgl_count, sg_bidi_ptr,
614 sg_no_bidi);
615 if (rc < 0) {
616 transport_send_check_condition_and_sense(se_cmd,
617 se_cmd->scsi_sense_reason, 0);
618 transport_generic_free_cmd(se_cmd, 0);
619 return;
620 }
621 transport_handle_cdb_direct(se_cmd);
622}
623
624static void vhost_scsi_handle_vq(struct vhost_scsi *vs)
625{
626 struct vhost_virtqueue *vq = &vs->vqs[2];
627 struct virtio_scsi_cmd_req v_req;
628 struct tcm_vhost_tpg *tv_tpg;
629 struct tcm_vhost_cmd *tv_cmd;
630 u32 exp_data_len, data_first, data_num, data_direction;
631 unsigned out, in, i;
632 int head, ret;
633
634 /* Must use ioctl VHOST_SCSI_SET_ENDPOINT */
635 tv_tpg = vs->vs_tpg;
636 if (unlikely(!tv_tpg)) {
637 pr_err("%s endpoint not set\n", __func__);
638 return;
639 }
640
641 mutex_lock(&vq->mutex);
642 vhost_disable_notify(&vs->dev, vq);
643
644 for (;;) {
645 head = vhost_get_vq_desc(&vs->dev, vq, vq->iov,
646 ARRAY_SIZE(vq->iov), &out, &in,
647 NULL, NULL);
648 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
649 head, out, in);
650 /* On error, stop handling until the next kick. */
651 if (unlikely(head < 0))
652 break;
653 /* Nothing new? Wait for eventfd to tell us they refilled. */
654 if (head == vq->num) {
655 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
656 vhost_disable_notify(&vs->dev, vq);
657 continue;
658 }
659 break;
660 }
661
662/* FIXME: BIDI operation */
663 if (out == 1 && in == 1) {
664 data_direction = DMA_NONE;
665 data_first = 0;
666 data_num = 0;
667 } else if (out == 1 && in > 1) {
668 data_direction = DMA_FROM_DEVICE;
669 data_first = out + 1;
670 data_num = in - 1;
671 } else if (out > 1 && in == 1) {
672 data_direction = DMA_TO_DEVICE;
673 data_first = 1;
674 data_num = out - 1;
675 } else {
676 vq_err(vq, "Invalid buffer layout out: %u in: %u\n",
677 out, in);
678 break;
679 }
680
681 /*
682 * Check for a sane resp buffer so we can report errors to
683 * the guest.
684 */
685 if (unlikely(vq->iov[out].iov_len !=
686 sizeof(struct virtio_scsi_cmd_resp))) {
687 vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
688 " bytes\n", vq->iov[out].iov_len);
689 break;
690 }
691
692 if (unlikely(vq->iov[0].iov_len != sizeof(v_req))) {
693 vq_err(vq, "Expecting virtio_scsi_cmd_req, got %zu"
694 " bytes\n", vq->iov[0].iov_len);
695 break;
696 }
697 pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p,"
698 " len: %zu\n", vq->iov[0].iov_base, sizeof(v_req));
699 ret = __copy_from_user(&v_req, vq->iov[0].iov_base,
700 sizeof(v_req));
701 if (unlikely(ret)) {
702 vq_err(vq, "Faulted on virtio_scsi_cmd_req\n");
703 break;
704 }
705
706 exp_data_len = 0;
707 for (i = 0; i < data_num; i++)
708 exp_data_len += vq->iov[data_first + i].iov_len;
709
710 tv_cmd = vhost_scsi_allocate_cmd(tv_tpg, &v_req,
711 exp_data_len, data_direction);
712 if (IS_ERR(tv_cmd)) {
713 vq_err(vq, "vhost_scsi_allocate_cmd failed %ld\n",
714 PTR_ERR(tv_cmd));
715 break;
716 }
717 pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
718 ": %d\n", tv_cmd, exp_data_len, data_direction);
719
720 tv_cmd->tvc_vhost = vs;
721
722 if (unlikely(vq->iov[out].iov_len !=
723 sizeof(struct virtio_scsi_cmd_resp))) {
724 vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
725 " bytes, out: %d, in: %d\n",
726 vq->iov[out].iov_len, out, in);
727 break;
728 }
729
730 tv_cmd->tvc_resp = vq->iov[out].iov_base;
731
732 /*
733 * Copy in the recieved CDB descriptor into tv_cmd->tvc_cdb
734 * that will be used by tcm_vhost_new_cmd_map() and down into
735 * target_setup_cmd_from_cdb()
736 */
737 memcpy(tv_cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE);
738 /*
739 * Check that the recieved CDB size does not exceeded our
740 * hardcoded max for tcm_vhost
741 */
742 /* TODO what if cdb was too small for varlen cdb header? */
743 if (unlikely(scsi_command_size(tv_cmd->tvc_cdb) >
744 TCM_VHOST_MAX_CDB_SIZE)) {
745 vq_err(vq, "Received SCSI CDB with command_size: %d that"
746 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
747 scsi_command_size(tv_cmd->tvc_cdb),
748 TCM_VHOST_MAX_CDB_SIZE);
749 break; /* TODO */
750 }
751 tv_cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
752
753 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
754 tv_cmd->tvc_cdb[0], tv_cmd->tvc_lun);
755
756 if (data_direction != DMA_NONE) {
757 ret = vhost_scsi_map_iov_to_sgl(tv_cmd,
758 &vq->iov[data_first], data_num,
759 data_direction == DMA_TO_DEVICE);
760 if (unlikely(ret)) {
761 vq_err(vq, "Failed to map iov to sgl\n");
762 break; /* TODO */
763 }
764 }
765
766 /*
767 * Save the descriptor from vhost_get_vq_desc() to be used to
768 * complete the virtio-scsi request in TCM callback context via
769 * tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
770 */
771 tv_cmd->tvc_vq_desc = head;
772 /*
773 * Dispatch tv_cmd descriptor for cmwq execution in process
774 * context provided by tcm_vhost_workqueue. This also ensures
775 * tv_cmd is executed on the same kworker CPU as this vhost
776 * thread to gain positive L2 cache locality effects..
777 */
778 INIT_WORK(&tv_cmd->work, tcm_vhost_submission_work);
779 queue_work(tcm_vhost_workqueue, &tv_cmd->work);
780 }
781
782 mutex_unlock(&vq->mutex);
783}
784
785static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
786{
787 pr_debug("%s: The handling func for control queue.\n", __func__);
788}
789
790static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
791{
792 pr_debug("%s: The handling func for event queue.\n", __func__);
793}
794
795static void vhost_scsi_handle_kick(struct vhost_work *work)
796{
797 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
798 poll.work);
799 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
800
801 vhost_scsi_handle_vq(vs);
802}
803
804/*
805 * Called from vhost_scsi_ioctl() context to walk the list of available
806 * tcm_vhost_tpg with an active struct tcm_vhost_nexus
807 */
808static int vhost_scsi_set_endpoint(
809 struct vhost_scsi *vs,
810 struct vhost_scsi_target *t)
811{
812 struct tcm_vhost_tport *tv_tport;
813 struct tcm_vhost_tpg *tv_tpg;
814 int index;
815
816 mutex_lock(&vs->dev.mutex);
817 /* Verify that ring has been setup correctly. */
818 for (index = 0; index < vs->dev.nvqs; ++index) {
819 /* Verify that ring has been setup correctly. */
820 if (!vhost_vq_access_ok(&vs->vqs[index])) {
821 mutex_unlock(&vs->dev.mutex);
822 return -EFAULT;
823 }
824 }
825 mutex_unlock(&vs->dev.mutex);
826
827 mutex_lock(&tcm_vhost_mutex);
828 list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) {
829 mutex_lock(&tv_tpg->tv_tpg_mutex);
830 if (!tv_tpg->tpg_nexus) {
831 mutex_unlock(&tv_tpg->tv_tpg_mutex);
832 continue;
833 }
834 if (tv_tpg->tv_tpg_vhost_count != 0) {
835 mutex_unlock(&tv_tpg->tv_tpg_mutex);
836 continue;
837 }
838 tv_tport = tv_tpg->tport;
839
840 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn) &&
841 (tv_tpg->tport_tpgt == t->vhost_tpgt)) {
842 tv_tpg->tv_tpg_vhost_count++;
843 mutex_unlock(&tv_tpg->tv_tpg_mutex);
844 mutex_unlock(&tcm_vhost_mutex);
845
846 mutex_lock(&vs->dev.mutex);
847 if (vs->vs_tpg) {
848 mutex_unlock(&vs->dev.mutex);
849 mutex_lock(&tv_tpg->tv_tpg_mutex);
850 tv_tpg->tv_tpg_vhost_count--;
851 mutex_unlock(&tv_tpg->tv_tpg_mutex);
852 return -EEXIST;
853 }
854
855 vs->vs_tpg = tv_tpg;
856 smp_mb__after_atomic_inc();
857 mutex_unlock(&vs->dev.mutex);
858 return 0;
859 }
860 mutex_unlock(&tv_tpg->tv_tpg_mutex);
861 }
862 mutex_unlock(&tcm_vhost_mutex);
863 return -EINVAL;
864}
865
866static int vhost_scsi_clear_endpoint(
867 struct vhost_scsi *vs,
868 struct vhost_scsi_target *t)
869{
870 struct tcm_vhost_tport *tv_tport;
871 struct tcm_vhost_tpg *tv_tpg;
872 int index, ret;
873
874 mutex_lock(&vs->dev.mutex);
875 /* Verify that ring has been setup correctly. */
876 for (index = 0; index < vs->dev.nvqs; ++index) {
877 if (!vhost_vq_access_ok(&vs->vqs[index])) {
878 ret = -EFAULT;
879 goto err;
880 }
881 }
882
883 if (!vs->vs_tpg) {
884 ret = -ENODEV;
885 goto err;
886 }
887 tv_tpg = vs->vs_tpg;
888 tv_tport = tv_tpg->tport;
889
890 if (strcmp(tv_tport->tport_name, t->vhost_wwpn) ||
891 (tv_tpg->tport_tpgt != t->vhost_tpgt)) {
892 pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu"
893 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
894 tv_tport->tport_name, tv_tpg->tport_tpgt,
895 t->vhost_wwpn, t->vhost_tpgt);
896 ret = -EINVAL;
897 goto err;
898 }
899 tv_tpg->tv_tpg_vhost_count--;
900 vs->vs_tpg = NULL;
901 mutex_unlock(&vs->dev.mutex);
902
903 return 0;
904
905err:
906 mutex_unlock(&vs->dev.mutex);
907 return ret;
908}
909
910static int vhost_scsi_open(struct inode *inode, struct file *f)
911{
912 struct vhost_scsi *s;
913 int r;
914
915 s = kzalloc(sizeof(*s), GFP_KERNEL);
916 if (!s)
917 return -ENOMEM;
918
919 vhost_work_init(&s->vs_completion_work, vhost_scsi_complete_cmd_work);
920 INIT_LIST_HEAD(&s->vs_completion_list);
921 spin_lock_init(&s->vs_completion_lock);
922
923 s->vqs[VHOST_SCSI_VQ_CTL].handle_kick = vhost_scsi_ctl_handle_kick;
924 s->vqs[VHOST_SCSI_VQ_EVT].handle_kick = vhost_scsi_evt_handle_kick;
925 s->vqs[VHOST_SCSI_VQ_IO].handle_kick = vhost_scsi_handle_kick;
926 r = vhost_dev_init(&s->dev, s->vqs, 3);
927 if (r < 0) {
928 kfree(s);
929 return r;
930 }
931
932 f->private_data = s;
933 return 0;
934}
935
936static int vhost_scsi_release(struct inode *inode, struct file *f)
937{
938 struct vhost_scsi *s = f->private_data;
939
940 if (s->vs_tpg && s->vs_tpg->tport) {
941 struct vhost_scsi_target backend;
942
943 memcpy(backend.vhost_wwpn, s->vs_tpg->tport->tport_name,
944 sizeof(backend.vhost_wwpn));
945 backend.vhost_tpgt = s->vs_tpg->tport_tpgt;
946 vhost_scsi_clear_endpoint(s, &backend);
947 }
948
949 vhost_dev_cleanup(&s->dev, false);
950 kfree(s);
951 return 0;
952}
953
954static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
955{
956 vhost_poll_flush(&vs->dev.vqs[index].poll);
957}
958
959static void vhost_scsi_flush(struct vhost_scsi *vs)
960{
961 vhost_scsi_flush_vq(vs, VHOST_SCSI_VQ_CTL);
962 vhost_scsi_flush_vq(vs, VHOST_SCSI_VQ_EVT);
963 vhost_scsi_flush_vq(vs, VHOST_SCSI_VQ_IO);
964}
965
966static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
967{
968 if (features & ~VHOST_FEATURES)
969 return -EOPNOTSUPP;
970
971 mutex_lock(&vs->dev.mutex);
972 if ((features & (1 << VHOST_F_LOG_ALL)) &&
973 !vhost_log_access_ok(&vs->dev)) {
974 mutex_unlock(&vs->dev.mutex);
975 return -EFAULT;
976 }
977 vs->dev.acked_features = features;
978 smp_wmb();
979 vhost_scsi_flush(vs);
980 mutex_unlock(&vs->dev.mutex);
981 return 0;
982}
983
984static long vhost_scsi_ioctl(struct file *f, unsigned int ioctl,
985 unsigned long arg)
986{
987 struct vhost_scsi *vs = f->private_data;
988 struct vhost_scsi_target backend;
989 void __user *argp = (void __user *)arg;
990 u64 __user *featurep = argp;
991 u64 features;
992 int r, abi_version = VHOST_SCSI_ABI_VERSION;
993
994 switch (ioctl) {
995 case VHOST_SCSI_SET_ENDPOINT:
996 if (copy_from_user(&backend, argp, sizeof backend))
997 return -EFAULT;
998 if (backend.reserved != 0)
999 return -EOPNOTSUPP;
1000
1001 return vhost_scsi_set_endpoint(vs, &backend);
1002 case VHOST_SCSI_CLEAR_ENDPOINT:
1003 if (copy_from_user(&backend, argp, sizeof backend))
1004 return -EFAULT;
1005 if (backend.reserved != 0)
1006 return -EOPNOTSUPP;
1007
1008 return vhost_scsi_clear_endpoint(vs, &backend);
1009 case VHOST_SCSI_GET_ABI_VERSION:
1010 if (copy_to_user(argp, &abi_version, sizeof abi_version))
1011 return -EFAULT;
1012 return 0;
1013 case VHOST_GET_FEATURES:
1014 features = VHOST_FEATURES;
1015 if (copy_to_user(featurep, &features, sizeof features))
1016 return -EFAULT;
1017 return 0;
1018 case VHOST_SET_FEATURES:
1019 if (copy_from_user(&features, featurep, sizeof features))
1020 return -EFAULT;
1021 return vhost_scsi_set_features(vs, features);
1022 default:
1023 mutex_lock(&vs->dev.mutex);
1024 r = vhost_dev_ioctl(&vs->dev, ioctl, arg);
1025 mutex_unlock(&vs->dev.mutex);
1026 return r;
1027 }
1028}
1029
1030#ifdef CONFIG_COMPAT
1031static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
1032 unsigned long arg)
1033{
1034 return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
1035}
1036#endif
1037
1038static const struct file_operations vhost_scsi_fops = {
1039 .owner = THIS_MODULE,
1040 .release = vhost_scsi_release,
1041 .unlocked_ioctl = vhost_scsi_ioctl,
1042#ifdef CONFIG_COMPAT
1043 .compat_ioctl = vhost_scsi_compat_ioctl,
1044#endif
1045 .open = vhost_scsi_open,
1046 .llseek = noop_llseek,
1047};
1048
1049static struct miscdevice vhost_scsi_misc = {
1050 MISC_DYNAMIC_MINOR,
1051 "vhost-scsi",
1052 &vhost_scsi_fops,
1053};
1054
1055static int __init vhost_scsi_register(void)
1056{
1057 return misc_register(&vhost_scsi_misc);
1058}
1059
1060static int vhost_scsi_deregister(void)
1061{
1062 return misc_deregister(&vhost_scsi_misc);
1063}
1064
1065static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport)
1066{
1067 switch (tport->tport_proto_id) {
1068 case SCSI_PROTOCOL_SAS:
1069 return "SAS";
1070 case SCSI_PROTOCOL_FCP:
1071 return "FCP";
1072 case SCSI_PROTOCOL_ISCSI:
1073 return "iSCSI";
1074 default:
1075 break;
1076 }
1077
1078 return "Unknown";
1079}
1080
1081static int tcm_vhost_port_link(struct se_portal_group *se_tpg,
1082 struct se_lun *lun)
1083{
1084 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1085 struct tcm_vhost_tpg, se_tpg);
1086
1087 mutex_lock(&tv_tpg->tv_tpg_mutex);
1088 tv_tpg->tv_tpg_port_count++;
1089 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1090
1091 return 0;
1092}
1093
1094static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg,
1095 struct se_lun *se_lun)
1096{
1097 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1098 struct tcm_vhost_tpg, se_tpg);
1099
1100 mutex_lock(&tv_tpg->tv_tpg_mutex);
1101 tv_tpg->tv_tpg_port_count--;
1102 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1103}
1104
1105static struct se_node_acl *tcm_vhost_make_nodeacl(
1106 struct se_portal_group *se_tpg,
1107 struct config_group *group,
1108 const char *name)
1109{
1110 struct se_node_acl *se_nacl, *se_nacl_new;
1111 struct tcm_vhost_nacl *nacl;
1112 u64 wwpn = 0;
1113 u32 nexus_depth;
1114
1115 /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1116 return ERR_PTR(-EINVAL); */
1117 se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg);
1118 if (!se_nacl_new)
1119 return ERR_PTR(-ENOMEM);
1120
1121 nexus_depth = 1;
1122 /*
1123 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1124 * when converting a NodeACL from demo mode -> explict
1125 */
1126 se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1127 name, nexus_depth);
1128 if (IS_ERR(se_nacl)) {
1129 tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new);
1130 return se_nacl;
1131 }
1132 /*
1133 * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN
1134 */
1135 nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl);
1136 nacl->iport_wwpn = wwpn;
1137
1138 return se_nacl;
1139}
1140
1141static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl)
1142{
1143 struct tcm_vhost_nacl *nacl = container_of(se_acl,
1144 struct tcm_vhost_nacl, se_node_acl);
1145 core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1146 kfree(nacl);
1147}
1148
1149static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tv_tpg,
1150 const char *name)
1151{
1152 struct se_portal_group *se_tpg;
1153 struct tcm_vhost_nexus *tv_nexus;
1154
1155 mutex_lock(&tv_tpg->tv_tpg_mutex);
1156 if (tv_tpg->tpg_nexus) {
1157 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1158 pr_debug("tv_tpg->tpg_nexus already exists\n");
1159 return -EEXIST;
1160 }
1161 se_tpg = &tv_tpg->se_tpg;
1162
1163 tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL);
1164 if (!tv_nexus) {
1165 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1166 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1167 return -ENOMEM;
1168 }
1169 /*
1170 * Initialize the struct se_session pointer
1171 */
1172 tv_nexus->tvn_se_sess = transport_init_session();
1173 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1174 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1175 kfree(tv_nexus);
1176 return -ENOMEM;
1177 }
1178 /*
1179 * Since we are running in 'demo mode' this call with generate a
1180 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1181 * the SCSI Initiator port name of the passed configfs group 'name'.
1182 */
1183 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1184 se_tpg, (unsigned char *)name);
1185 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1186 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1187 pr_debug("core_tpg_check_initiator_node_acl() failed"
1188 " for %s\n", name);
1189 transport_free_session(tv_nexus->tvn_se_sess);
1190 kfree(tv_nexus);
1191 return -ENOMEM;
1192 }
1193 /*
1194 * Now register the TCM vhost virtual I_T Nexus as active with the
1195 * call to __transport_register_session()
1196 */
1197 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1198 tv_nexus->tvn_se_sess, tv_nexus);
1199 tv_tpg->tpg_nexus = tv_nexus;
1200
1201 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1202 return 0;
1203}
1204
1205static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg *tpg)
1206{
1207 struct se_session *se_sess;
1208 struct tcm_vhost_nexus *tv_nexus;
1209
1210 mutex_lock(&tpg->tv_tpg_mutex);
1211 tv_nexus = tpg->tpg_nexus;
1212 if (!tv_nexus) {
1213 mutex_unlock(&tpg->tv_tpg_mutex);
1214 return -ENODEV;
1215 }
1216
1217 se_sess = tv_nexus->tvn_se_sess;
1218 if (!se_sess) {
1219 mutex_unlock(&tpg->tv_tpg_mutex);
1220 return -ENODEV;
1221 }
1222
1223 if (tpg->tv_tpg_port_count != 0) {
1224 mutex_unlock(&tpg->tv_tpg_mutex);
1225 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1226 " active TPG port count: %d\n",
1227 tpg->tv_tpg_port_count);
1228 return -EBUSY;
1229 }
1230
1231 if (tpg->tv_tpg_vhost_count != 0) {
1232 mutex_unlock(&tpg->tv_tpg_mutex);
1233 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1234 " active TPG vhost count: %d\n",
1235 tpg->tv_tpg_vhost_count);
1236 return -EBUSY;
1237 }
1238
1239 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
1240 " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport),
1241 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1242 /*
1243 * Release the SCSI I_T Nexus to the emulated vhost Target Port
1244 */
1245 transport_deregister_session(tv_nexus->tvn_se_sess);
1246 tpg->tpg_nexus = NULL;
1247 mutex_unlock(&tpg->tv_tpg_mutex);
1248
1249 kfree(tv_nexus);
1250 return 0;
1251}
1252
1253static ssize_t tcm_vhost_tpg_show_nexus(struct se_portal_group *se_tpg,
1254 char *page)
1255{
1256 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1257 struct tcm_vhost_tpg, se_tpg);
1258 struct tcm_vhost_nexus *tv_nexus;
1259 ssize_t ret;
1260
1261 mutex_lock(&tv_tpg->tv_tpg_mutex);
1262 tv_nexus = tv_tpg->tpg_nexus;
1263 if (!tv_nexus) {
1264 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1265 return -ENODEV;
1266 }
1267 ret = snprintf(page, PAGE_SIZE, "%s\n",
1268 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1269 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1270
1271 return ret;
1272}
1273
1274static ssize_t tcm_vhost_tpg_store_nexus(struct se_portal_group *se_tpg,
1275 const char *page,
1276 size_t count)
1277{
1278 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1279 struct tcm_vhost_tpg, se_tpg);
1280 struct tcm_vhost_tport *tport_wwn = tv_tpg->tport;
1281 unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr;
1282 int ret;
1283 /*
1284 * Shutdown the active I_T nexus if 'NULL' is passed..
1285 */
1286 if (!strncmp(page, "NULL", 4)) {
1287 ret = tcm_vhost_drop_nexus(tv_tpg);
1288 return (!ret) ? count : ret;
1289 }
1290 /*
1291 * Otherwise make sure the passed virtual Initiator port WWN matches
1292 * the fabric protocol_id set in tcm_vhost_make_tport(), and call
1293 * tcm_vhost_make_nexus().
1294 */
1295 if (strlen(page) >= TCM_VHOST_NAMELEN) {
1296 pr_err("Emulated NAA Sas Address: %s, exceeds"
1297 " max: %d\n", page, TCM_VHOST_NAMELEN);
1298 return -EINVAL;
1299 }
1300 snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page);
1301
1302 ptr = strstr(i_port, "naa.");
1303 if (ptr) {
1304 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1305 pr_err("Passed SAS Initiator Port %s does not"
1306 " match target port protoid: %s\n", i_port,
1307 tcm_vhost_dump_proto_id(tport_wwn));
1308 return -EINVAL;
1309 }
1310 port_ptr = &i_port[0];
1311 goto check_newline;
1312 }
1313 ptr = strstr(i_port, "fc.");
1314 if (ptr) {
1315 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1316 pr_err("Passed FCP Initiator Port %s does not"
1317 " match target port protoid: %s\n", i_port,
1318 tcm_vhost_dump_proto_id(tport_wwn));
1319 return -EINVAL;
1320 }
1321 port_ptr = &i_port[3]; /* Skip over "fc." */
1322 goto check_newline;
1323 }
1324 ptr = strstr(i_port, "iqn.");
1325 if (ptr) {
1326 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1327 pr_err("Passed iSCSI Initiator Port %s does not"
1328 " match target port protoid: %s\n", i_port,
1329 tcm_vhost_dump_proto_id(tport_wwn));
1330 return -EINVAL;
1331 }
1332 port_ptr = &i_port[0];
1333 goto check_newline;
1334 }
1335 pr_err("Unable to locate prefix for emulated Initiator Port:"
1336 " %s\n", i_port);
1337 return -EINVAL;
1338 /*
1339 * Clear any trailing newline for the NAA WWN
1340 */
1341check_newline:
1342 if (i_port[strlen(i_port)-1] == '\n')
1343 i_port[strlen(i_port)-1] = '\0';
1344
1345 ret = tcm_vhost_make_nexus(tv_tpg, port_ptr);
1346 if (ret < 0)
1347 return ret;
1348
1349 return count;
1350}
1351
1352TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR);
1353
1354static struct configfs_attribute *tcm_vhost_tpg_attrs[] = {
1355 &tcm_vhost_tpg_nexus.attr,
1356 NULL,
1357};
1358
1359static struct se_portal_group *tcm_vhost_make_tpg(struct se_wwn *wwn,
1360 struct config_group *group,
1361 const char *name)
1362{
1363 struct tcm_vhost_tport *tport = container_of(wwn,
1364 struct tcm_vhost_tport, tport_wwn);
1365
1366 struct tcm_vhost_tpg *tpg;
1367 unsigned long tpgt;
1368 int ret;
1369
1370 if (strstr(name, "tpgt_") != name)
1371 return ERR_PTR(-EINVAL);
1372 if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
1373 return ERR_PTR(-EINVAL);
1374
1375 tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL);
1376 if (!tpg) {
1377 pr_err("Unable to allocate struct tcm_vhost_tpg");
1378 return ERR_PTR(-ENOMEM);
1379 }
1380 mutex_init(&tpg->tv_tpg_mutex);
1381 INIT_LIST_HEAD(&tpg->tv_tpg_list);
1382 tpg->tport = tport;
1383 tpg->tport_tpgt = tpgt;
1384
1385 ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn,
1386 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
1387 if (ret < 0) {
1388 kfree(tpg);
1389 return NULL;
1390 }
1391 mutex_lock(&tcm_vhost_mutex);
1392 list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list);
1393 mutex_unlock(&tcm_vhost_mutex);
1394
1395 return &tpg->se_tpg;
1396}
1397
1398static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg)
1399{
1400 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
1401 struct tcm_vhost_tpg, se_tpg);
1402
1403 mutex_lock(&tcm_vhost_mutex);
1404 list_del(&tpg->tv_tpg_list);
1405 mutex_unlock(&tcm_vhost_mutex);
1406 /*
1407 * Release the virtual I_T Nexus for this vhost TPG
1408 */
1409 tcm_vhost_drop_nexus(tpg);
1410 /*
1411 * Deregister the se_tpg from TCM..
1412 */
1413 core_tpg_deregister(se_tpg);
1414 kfree(tpg);
1415}
1416
1417static struct se_wwn *tcm_vhost_make_tport(struct target_fabric_configfs *tf,
1418 struct config_group *group,
1419 const char *name)
1420{
1421 struct tcm_vhost_tport *tport;
1422 char *ptr;
1423 u64 wwpn = 0;
1424 int off = 0;
1425
1426 /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1427 return ERR_PTR(-EINVAL); */
1428
1429 tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL);
1430 if (!tport) {
1431 pr_err("Unable to allocate struct tcm_vhost_tport");
1432 return ERR_PTR(-ENOMEM);
1433 }
1434 tport->tport_wwpn = wwpn;
1435 /*
1436 * Determine the emulated Protocol Identifier and Target Port Name
1437 * based on the incoming configfs directory name.
1438 */
1439 ptr = strstr(name, "naa.");
1440 if (ptr) {
1441 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
1442 goto check_len;
1443 }
1444 ptr = strstr(name, "fc.");
1445 if (ptr) {
1446 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
1447 off = 3; /* Skip over "fc." */
1448 goto check_len;
1449 }
1450 ptr = strstr(name, "iqn.");
1451 if (ptr) {
1452 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
1453 goto check_len;
1454 }
1455
1456 pr_err("Unable to locate prefix for emulated Target Port:"
1457 " %s\n", name);
1458 kfree(tport);
1459 return ERR_PTR(-EINVAL);
1460
1461check_len:
1462 if (strlen(name) >= TCM_VHOST_NAMELEN) {
1463 pr_err("Emulated %s Address: %s, exceeds"
1464 " max: %d\n", name, tcm_vhost_dump_proto_id(tport),
1465 TCM_VHOST_NAMELEN);
1466 kfree(tport);
1467 return ERR_PTR(-EINVAL);
1468 }
1469 snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]);
1470
1471 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
1472 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name);
1473
1474 return &tport->tport_wwn;
1475}
1476
1477static void tcm_vhost_drop_tport(struct se_wwn *wwn)
1478{
1479 struct tcm_vhost_tport *tport = container_of(wwn,
1480 struct tcm_vhost_tport, tport_wwn);
1481
1482 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
1483 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport),
1484 tport->tport_name);
1485
1486 kfree(tport);
1487}
1488
1489static ssize_t tcm_vhost_wwn_show_attr_version(
1490 struct target_fabric_configfs *tf,
1491 char *page)
1492{
1493 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
1494 "on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
1495 utsname()->machine);
1496}
1497
1498TF_WWN_ATTR_RO(tcm_vhost, version);
1499
1500static struct configfs_attribute *tcm_vhost_wwn_attrs[] = {
1501 &tcm_vhost_wwn_version.attr,
1502 NULL,
1503};
1504
1505static struct target_core_fabric_ops tcm_vhost_ops = {
1506 .get_fabric_name = tcm_vhost_get_fabric_name,
1507 .get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident,
1508 .tpg_get_wwn = tcm_vhost_get_fabric_wwn,
1509 .tpg_get_tag = tcm_vhost_get_tag,
1510 .tpg_get_default_depth = tcm_vhost_get_default_depth,
1511 .tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id,
1512 .tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len,
1513 .tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id,
1514 .tpg_check_demo_mode = tcm_vhost_check_true,
1515 .tpg_check_demo_mode_cache = tcm_vhost_check_true,
1516 .tpg_check_demo_mode_write_protect = tcm_vhost_check_false,
1517 .tpg_check_prod_mode_write_protect = tcm_vhost_check_false,
1518 .tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl,
1519 .tpg_release_fabric_acl = tcm_vhost_release_fabric_acl,
1520 .tpg_get_inst_index = tcm_vhost_tpg_get_inst_index,
1521 .release_cmd = tcm_vhost_release_cmd,
1522 .shutdown_session = tcm_vhost_shutdown_session,
1523 .close_session = tcm_vhost_close_session,
1524 .sess_get_index = tcm_vhost_sess_get_index,
1525 .sess_get_initiator_sid = NULL,
1526 .write_pending = tcm_vhost_write_pending,
1527 .write_pending_status = tcm_vhost_write_pending_status,
1528 .set_default_node_attributes = tcm_vhost_set_default_node_attrs,
1529 .get_task_tag = tcm_vhost_get_task_tag,
1530 .get_cmd_state = tcm_vhost_get_cmd_state,
1531 .queue_data_in = tcm_vhost_queue_data_in,
1532 .queue_status = tcm_vhost_queue_status,
1533 .queue_tm_rsp = tcm_vhost_queue_tm_rsp,
1534 .get_fabric_sense_len = tcm_vhost_get_fabric_sense_len,
1535 .set_fabric_sense_len = tcm_vhost_set_fabric_sense_len,
1536 /*
1537 * Setup callers for generic logic in target_core_fabric_configfs.c
1538 */
1539 .fabric_make_wwn = tcm_vhost_make_tport,
1540 .fabric_drop_wwn = tcm_vhost_drop_tport,
1541 .fabric_make_tpg = tcm_vhost_make_tpg,
1542 .fabric_drop_tpg = tcm_vhost_drop_tpg,
1543 .fabric_post_link = tcm_vhost_port_link,
1544 .fabric_pre_unlink = tcm_vhost_port_unlink,
1545 .fabric_make_np = NULL,
1546 .fabric_drop_np = NULL,
1547 .fabric_make_nodeacl = tcm_vhost_make_nodeacl,
1548 .fabric_drop_nodeacl = tcm_vhost_drop_nodeacl,
1549};
1550
1551static int tcm_vhost_register_configfs(void)
1552{
1553 struct target_fabric_configfs *fabric;
1554 int ret;
1555
1556 pr_debug("TCM_VHOST fabric module %s on %s/%s"
1557 " on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
1558 utsname()->machine);
1559 /*
1560 * Register the top level struct config_item_type with TCM core
1561 */
1562 fabric = target_fabric_configfs_init(THIS_MODULE, "vhost");
1563 if (IS_ERR(fabric)) {
1564 pr_err("target_fabric_configfs_init() failed\n");
1565 return PTR_ERR(fabric);
1566 }
1567 /*
1568 * Setup fabric->tf_ops from our local tcm_vhost_ops
1569 */
1570 fabric->tf_ops = tcm_vhost_ops;
1571 /*
1572 * Setup default attribute lists for various fabric->tf_cit_tmpl
1573 */
1574 TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs;
1575 TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs;
1576 TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1577 TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1578 TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1579 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
1580 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
1581 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
1582 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
1583 /*
1584 * Register the fabric for use within TCM
1585 */
1586 ret = target_fabric_configfs_register(fabric);
1587 if (ret < 0) {
1588 pr_err("target_fabric_configfs_register() failed"
1589 " for TCM_VHOST\n");
1590 return ret;
1591 }
1592 /*
1593 * Setup our local pointer to *fabric
1594 */
1595 tcm_vhost_fabric_configfs = fabric;
1596 pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n");
1597 return 0;
1598};
1599
1600static void tcm_vhost_deregister_configfs(void)
1601{
1602 if (!tcm_vhost_fabric_configfs)
1603 return;
1604
1605 target_fabric_configfs_deregister(tcm_vhost_fabric_configfs);
1606 tcm_vhost_fabric_configfs = NULL;
1607 pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n");
1608};
1609
1610static int __init tcm_vhost_init(void)
1611{
1612 int ret = -ENOMEM;
1613 /*
1614 * Use our own dedicated workqueue for submitting I/O into
1615 * target core to avoid contention within system_wq.
1616 */
1617 tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0);
1618 if (!tcm_vhost_workqueue)
1619 goto out;
1620
1621 ret = vhost_scsi_register();
1622 if (ret < 0)
1623 goto out_destroy_workqueue;
1624
1625 ret = tcm_vhost_register_configfs();
1626 if (ret < 0)
1627 goto out_vhost_scsi_deregister;
1628
1629 return 0;
1630
1631out_vhost_scsi_deregister:
1632 vhost_scsi_deregister();
1633out_destroy_workqueue:
1634 destroy_workqueue(tcm_vhost_workqueue);
1635out:
1636 return ret;
1637};
1638
1639static void tcm_vhost_exit(void)
1640{
1641 tcm_vhost_deregister_configfs();
1642 vhost_scsi_deregister();
1643 destroy_workqueue(tcm_vhost_workqueue);
1644};
1645
1646MODULE_DESCRIPTION("TCM_VHOST series fabric driver");
1647MODULE_LICENSE("GPL");
1648module_init(tcm_vhost_init);
1649module_exit(tcm_vhost_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-27 15:45:03 -0500