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target: change sprintf to snprintf in transport_dump_vpd_ident
[linux-block.git] / drivers / vhost / tcm_vhost.c
CommitLineData
057cbf49
NB		 1/*******************************************************************************
2 * Vhost kernel TCM fabric driver for virtio SCSI initiators
3 *
4 * (C) Copyright 2010-2012 RisingTide Systems LLC.
5 * (C) Copyright 2010-2012 IBM Corp.
6 *
7 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
8 *
9 * Authors: Nicholas A. Bellinger <nab@risingtidesystems.com>
10 * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 ****************************************************************************/
23
24#include <linux/module.h>
25#include <linux/moduleparam.h>
26#include <generated/utsrelease.h>
27#include <linux/utsname.h>
28#include <linux/init.h>
29#include <linux/slab.h>
30#include <linux/kthread.h>
31#include <linux/types.h>
32#include <linux/string.h>
33#include <linux/configfs.h>
34#include <linux/ctype.h>
35#include <linux/compat.h>
36#include <linux/eventfd.h>
057cbf49
NB		 37#include <linux/fs.h>
38#include <linux/miscdevice.h>
39#include <asm/unaligned.h>
40#include <scsi/scsi.h>
41#include <scsi/scsi_tcq.h>
42#include <target/target_core_base.h>
43#include <target/target_core_fabric.h>
44#include <target/target_core_fabric_configfs.h>
45#include <target/target_core_configfs.h>
46#include <target/configfs_macros.h>
47#include <linux/vhost.h>
48#include <linux/virtio_net.h> /* TODO vhost.h currently depends on this */
49#include <linux/virtio_scsi.h>
50
51#include "vhost.c"
52#include "vhost.h"
53#include "tcm_vhost.h"
54
101998f6
NB		 55enum {
56 VHOST_SCSI_VQ_CTL = 0,
57 VHOST_SCSI_VQ_EVT = 1,
58 VHOST_SCSI_VQ_IO = 2,
59};
60
057cbf49 61struct vhost_scsi {
101998f6 62 struct tcm_vhost_tpg *vs_tpg; /* Protected by vhost_scsi->dev.mutex */
057cbf49
NB		 63 struct vhost_dev dev;
64 struct vhost_virtqueue vqs[3];
65
66 struct vhost_work vs_completion_work; /* cmd completion work item */
67 struct list_head vs_completion_list; /* cmd completion queue */
68 spinlock_t vs_completion_lock; /* protects s_completion_list */
69};
70
71/* Local pointer to allocated TCM configfs fabric module */
72static struct target_fabric_configfs *tcm_vhost_fabric_configfs;
73
74static struct workqueue_struct *tcm_vhost_workqueue;
75
76/* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */
77static DEFINE_MUTEX(tcm_vhost_mutex);
78static LIST_HEAD(tcm_vhost_list);
79
80static int tcm_vhost_check_true(struct se_portal_group *se_tpg)
81{
82 return 1;
83}
84
85static int tcm_vhost_check_false(struct se_portal_group *se_tpg)
86{
87 return 0;
88}
89
90static char *tcm_vhost_get_fabric_name(void)
91{
92 return "vhost";
93}
94
95static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg)
96{
97 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
98 struct tcm_vhost_tpg, se_tpg);
99 struct tcm_vhost_tport *tport = tpg->tport;
100
101 switch (tport->tport_proto_id) {
102 case SCSI_PROTOCOL_SAS:
103 return sas_get_fabric_proto_ident(se_tpg);
104 case SCSI_PROTOCOL_FCP:
105 return fc_get_fabric_proto_ident(se_tpg);
106 case SCSI_PROTOCOL_ISCSI:
107 return iscsi_get_fabric_proto_ident(se_tpg);
108 default:
109 pr_err("Unknown tport_proto_id: 0x%02x, using"
110 " SAS emulation\n", tport->tport_proto_id);
111 break;
112 }
113
114 return sas_get_fabric_proto_ident(se_tpg);
115}
116
117static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg)
118{
119 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
120 struct tcm_vhost_tpg, se_tpg);
121 struct tcm_vhost_tport *tport = tpg->tport;
122
123 return &tport->tport_name[0];
124}
125
126static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg)
127{
128 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
129 struct tcm_vhost_tpg, se_tpg);
130 return tpg->tport_tpgt;
131}
132
133static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg)
134{
135 return 1;
136}
137
101998f6 138static u32 tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg,
057cbf49
NB		 139 struct se_node_acl *se_nacl,
140 struct t10_pr_registration *pr_reg,
141 int *format_code,
142 unsigned char *buf)
143{
144 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
145 struct tcm_vhost_tpg, se_tpg);
146 struct tcm_vhost_tport *tport = tpg->tport;
147
148 switch (tport->tport_proto_id) {
149 case SCSI_PROTOCOL_SAS:
150 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
151 format_code, buf);
152 case SCSI_PROTOCOL_FCP:
153 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
154 format_code, buf);
155 case SCSI_PROTOCOL_ISCSI:
156 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
157 format_code, buf);
158 default:
159 pr_err("Unknown tport_proto_id: 0x%02x, using"
160 " SAS emulation\n", tport->tport_proto_id);
161 break;
162 }
163
164 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
165 format_code, buf);
166}
167
101998f6 168static u32 tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg,
057cbf49
NB		 169 struct se_node_acl *se_nacl,
170 struct t10_pr_registration *pr_reg,
171 int *format_code)
172{
173 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
174 struct tcm_vhost_tpg, se_tpg);
175 struct tcm_vhost_tport *tport = tpg->tport;
176
177 switch (tport->tport_proto_id) {
178 case SCSI_PROTOCOL_SAS:
179 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
180 format_code);
181 case SCSI_PROTOCOL_FCP:
182 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
183 format_code);
184 case SCSI_PROTOCOL_ISCSI:
185 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
186 format_code);
187 default:
188 pr_err("Unknown tport_proto_id: 0x%02x, using"
189 " SAS emulation\n", tport->tport_proto_id);
190 break;
191 }
192
193 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
194 format_code);
195}
196
101998f6 197static char *tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
057cbf49
NB		 198 const char *buf,
199 u32 *out_tid_len,
200 char **port_nexus_ptr)
201{
202 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
203 struct tcm_vhost_tpg, se_tpg);
204 struct tcm_vhost_tport *tport = tpg->tport;
205
206 switch (tport->tport_proto_id) {
207 case SCSI_PROTOCOL_SAS:
208 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
209 port_nexus_ptr);
210 case SCSI_PROTOCOL_FCP:
211 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
212 port_nexus_ptr);
213 case SCSI_PROTOCOL_ISCSI:
214 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
215 port_nexus_ptr);
216 default:
217 pr_err("Unknown tport_proto_id: 0x%02x, using"
218 " SAS emulation\n", tport->tport_proto_id);
219 break;
220 }
221
222 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
223 port_nexus_ptr);
224}
225
226static struct se_node_acl *tcm_vhost_alloc_fabric_acl(
227 struct se_portal_group *se_tpg)
228{
229 struct tcm_vhost_nacl *nacl;
230
231 nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL);
232 if (!nacl) {
744627e9 233 pr_err("Unable to allocate struct tcm_vhost_nacl\n");
057cbf49
NB		 234 return NULL;
235 }
236
237 return &nacl->se_node_acl;
238}
239
101998f6 240static void tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg,
057cbf49
NB		 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
101998f6
NB		 300static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *tv_cmd)
301{
302 struct vhost_scsi *vs = tv_cmd->tvc_vhost;
303
304 spin_lock_bh(&vs->vs_completion_lock);
305 list_add_tail(&tv_cmd->tvc_completion_list, &vs->vs_completion_list);
306 spin_unlock_bh(&vs->vs_completion_lock);
307
308 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
309}
057cbf49
NB		 310
311static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd)
312{
313 struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
314 struct tcm_vhost_cmd, tvc_se_cmd);
315 vhost_scsi_complete_cmd(tv_cmd);
316 return 0;
317}
318
319static int tcm_vhost_queue_status(struct se_cmd *se_cmd)
320{
321 struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
322 struct tcm_vhost_cmd, tvc_se_cmd);
323 vhost_scsi_complete_cmd(tv_cmd);
324 return 0;
325}
326
327static int tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd)
328{
329 return 0;
330}
331
057cbf49
NB		 332static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd)
333{
334 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
335
336 /* TODO locking against target/backend threads? */
337 transport_generic_free_cmd(se_cmd, 1);
338
339 if (tv_cmd->tvc_sgl_count) {
340 u32 i;
341 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
342 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
343
344 kfree(tv_cmd->tvc_sgl);
345 }
346
347 kfree(tv_cmd);
348}
349
350/* Dequeue a command from the completion list */
351static struct tcm_vhost_cmd *vhost_scsi_get_cmd_from_completion(
352 struct vhost_scsi *vs)
353{
354 struct tcm_vhost_cmd *tv_cmd = NULL;
355
356 spin_lock_bh(&vs->vs_completion_lock);
357 if (list_empty(&vs->vs_completion_list)) {
358 spin_unlock_bh(&vs->vs_completion_lock);
359 return NULL;
360 }
361
362 list_for_each_entry(tv_cmd, &vs->vs_completion_list,
363 tvc_completion_list) {
364 list_del(&tv_cmd->tvc_completion_list);
365 break;
366 }
367 spin_unlock_bh(&vs->vs_completion_lock);
368 return tv_cmd;
369}
370
371/* Fill in status and signal that we are done processing this command
372 *
373 * This is scheduled in the vhost work queue so we are called with the owner
374 * process mm and can access the vring.
375 */
376static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
377{
378 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
379 vs_completion_work);
380 struct tcm_vhost_cmd *tv_cmd;
381
101998f6 382 while ((tv_cmd = vhost_scsi_get_cmd_from_completion(vs))) {
057cbf49
NB		 383 struct virtio_scsi_cmd_resp v_rsp;
384 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
385 int ret;
386
387 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
388 tv_cmd, se_cmd->residual_count, se_cmd->scsi_status);
389
390 memset(&v_rsp, 0, sizeof(v_rsp));
391 v_rsp.resid = se_cmd->residual_count;
392 /* TODO is status_qualifier field needed? */
393 v_rsp.status = se_cmd->scsi_status;
394 v_rsp.sense_len = se_cmd->scsi_sense_length;
395 memcpy(v_rsp.sense, tv_cmd->tvc_sense_buf,
396 v_rsp.sense_len);
397 ret = copy_to_user(tv_cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
398 if (likely(ret == 0))
399 vhost_add_used(&vs->vqs[2], tv_cmd->tvc_vq_desc, 0);
400 else
401 pr_err("Faulted on virtio_scsi_cmd_resp\n");
402
403 vhost_scsi_free_cmd(tv_cmd);
404 }
405
406 vhost_signal(&vs->dev, &vs->vqs[2]);
407}
408
057cbf49
NB		 409static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd(
410 struct tcm_vhost_tpg *tv_tpg,
411 struct virtio_scsi_cmd_req *v_req,
412 u32 exp_data_len,
413 int data_direction)
414{
415 struct tcm_vhost_cmd *tv_cmd;
416 struct tcm_vhost_nexus *tv_nexus;
057cbf49
NB		 417
418 tv_nexus = tv_tpg->tpg_nexus;
419 if (!tv_nexus) {
420 pr_err("Unable to locate active struct tcm_vhost_nexus\n");
421 return ERR_PTR(-EIO);
422 }
057cbf49
NB		 423
424 tv_cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC);
425 if (!tv_cmd) {
426 pr_err("Unable to allocate struct tcm_vhost_cmd\n");
427 return ERR_PTR(-ENOMEM);
428 }
429 INIT_LIST_HEAD(&tv_cmd->tvc_completion_list);
430 tv_cmd->tvc_tag = v_req->tag;
9f0abc15
NB		 431 tv_cmd->tvc_task_attr = v_req->task_attr;
432 tv_cmd->tvc_exp_data_len = exp_data_len;
433 tv_cmd->tvc_data_direction = data_direction;
434 tv_cmd->tvc_nexus = tv_nexus;
057cbf49 435
057cbf49
NB		 436 return tv_cmd;
437}
438
439/*
440 * Map a user memory range into a scatterlist
441 *
442 * Returns the number of scatterlist entries used or -errno on error.
443 */
444static int vhost_scsi_map_to_sgl(struct scatterlist *sgl,
445 unsigned int sgl_count, void __user *ptr, size_t len, int write)
446{
447 struct scatterlist *sg = sgl;
448 unsigned int npages = 0;
449 int ret;
450
451 while (len > 0) {
452 struct page *page;
453 unsigned int offset = (uintptr_t)ptr & ~PAGE_MASK;
454 unsigned int nbytes = min_t(unsigned int,
455 PAGE_SIZE - offset, len);
456
457 if (npages == sgl_count) {
458 ret = -ENOBUFS;
459 goto err;
460 }
461
462 ret = get_user_pages_fast((unsigned long)ptr, 1, write, &page);
463 BUG_ON(ret == 0); /* we should either get our page or fail */
464 if (ret < 0)
465 goto err;
466
467 sg_set_page(sg, page, nbytes, offset);
468 ptr += nbytes;
469 len -= nbytes;
470 sg++;
471 npages++;
472 }
473 return npages;
474
475err:
476 /* Put pages that we hold */
477 for (sg = sgl; sg != &sgl[npages]; sg++)
478 put_page(sg_page(sg));
479 return ret;
480}
481
482static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd,
483 struct iovec *iov, unsigned int niov, int write)
484{
485 int ret;
486 unsigned int i;
487 u32 sgl_count;
488 struct scatterlist *sg;
489
490 /*
491 * Find out how long sglist needs to be
492 */
493 sgl_count = 0;
494 for (i = 0; i < niov; i++) {
495 sgl_count += (((uintptr_t)iov[i].iov_base + iov[i].iov_len +
496 PAGE_SIZE - 1) >> PAGE_SHIFT) -
497 ((uintptr_t)iov[i].iov_base >> PAGE_SHIFT);
498 }
499 /* TODO overflow checking */
500
501 sg = kmalloc(sizeof(tv_cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC);
502 if (!sg)
503 return -ENOMEM;
f0e0e9bb
FW		 504 pr_debug("%s sg %p sgl_count %u is_err %d\n", __func__,
505 sg, sgl_count, !sg);
057cbf49
NB		 506 sg_init_table(sg, sgl_count);
507
508 tv_cmd->tvc_sgl = sg;
509 tv_cmd->tvc_sgl_count = sgl_count;
510
511 pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count);
512 for (i = 0; i < niov; i++) {
513 ret = vhost_scsi_map_to_sgl(sg, sgl_count, iov[i].iov_base,
514 iov[i].iov_len, write);
515 if (ret < 0) {
516 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
517 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
518 kfree(tv_cmd->tvc_sgl);
519 tv_cmd->tvc_sgl = NULL;
520 tv_cmd->tvc_sgl_count = 0;
521 return ret;
522 }
523
524 sg += ret;
525 sgl_count -= ret;
526 }
527 return 0;
528}
529
530static void tcm_vhost_submission_work(struct work_struct *work)
531{
532 struct tcm_vhost_cmd *tv_cmd =
533 container_of(work, struct tcm_vhost_cmd, work);
9f0abc15 534 struct tcm_vhost_nexus *tv_nexus;
057cbf49
NB		 535 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
536 struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL;
537 int rc, sg_no_bidi = 0;
057cbf49
NB		 538
539 if (tv_cmd->tvc_sgl_count) {
540 sg_ptr = tv_cmd->tvc_sgl;
057cbf49
NB		 541/* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */
542#if 0
543 if (se_cmd->se_cmd_flags & SCF_BIDI) {
544 sg_bidi_ptr = NULL;
545 sg_no_bidi = 0;
546 }
547#endif
548 } else {
549 sg_ptr = NULL;
550 }
9f0abc15
NB		 551 tv_nexus = tv_cmd->tvc_nexus;
552
553 rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
554 tv_cmd->tvc_cdb, &tv_cmd->tvc_sense_buf[0],
555 tv_cmd->tvc_lun, tv_cmd->tvc_exp_data_len,
556 tv_cmd->tvc_task_attr, tv_cmd->tvc_data_direction,
557 0, sg_ptr, tv_cmd->tvc_sgl_count,
558 sg_bidi_ptr, sg_no_bidi);
057cbf49
NB		 559 if (rc < 0) {
560 transport_send_check_condition_and_sense(se_cmd,
9f0abc15 561 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
057cbf49 562 transport_generic_free_cmd(se_cmd, 0);
057cbf49 563 }
057cbf49
NB		 564}
565
566static void vhost_scsi_handle_vq(struct vhost_scsi *vs)
567{
568 struct vhost_virtqueue *vq = &vs->vqs[2];
569 struct virtio_scsi_cmd_req v_req;
570 struct tcm_vhost_tpg *tv_tpg;
571 struct tcm_vhost_cmd *tv_cmd;
572 u32 exp_data_len, data_first, data_num, data_direction;
573 unsigned out, in, i;
574 int head, ret;
575
576 /* Must use ioctl VHOST_SCSI_SET_ENDPOINT */
577 tv_tpg = vs->vs_tpg;
71f1e45a 578 if (unlikely(!tv_tpg))
057cbf49 579 return;
057cbf49
NB		 580
581 mutex_lock(&vq->mutex);
582 vhost_disable_notify(&vs->dev, vq);
583
584 for (;;) {
585 head = vhost_get_vq_desc(&vs->dev, vq, vq->iov,
586 ARRAY_SIZE(vq->iov), &out, &in,
587 NULL, NULL);
588 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
589 head, out, in);
590 /* On error, stop handling until the next kick. */
591 if (unlikely(head < 0))
592 break;
593 /* Nothing new? Wait for eventfd to tell us they refilled. */
594 if (head == vq->num) {
595 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
596 vhost_disable_notify(&vs->dev, vq);
597 continue;
598 }
599 break;
600 }
601
602/* FIXME: BIDI operation */
603 if (out == 1 && in == 1) {
604 data_direction = DMA_NONE;
605 data_first = 0;
606 data_num = 0;
607 } else if (out == 1 && in > 1) {
608 data_direction = DMA_FROM_DEVICE;
609 data_first = out + 1;
610 data_num = in - 1;
611 } else if (out > 1 && in == 1) {
612 data_direction = DMA_TO_DEVICE;
613 data_first = 1;
614 data_num = out - 1;
615 } else {
616 vq_err(vq, "Invalid buffer layout out: %u in: %u\n",
617 out, in);
618 break;
619 }
620
621 /*
622 * Check for a sane resp buffer so we can report errors to
623 * the guest.
624 */
625 if (unlikely(vq->iov[out].iov_len !=
626 sizeof(struct virtio_scsi_cmd_resp))) {
627 vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
628 " bytes\n", vq->iov[out].iov_len);
629 break;
630 }
631
632 if (unlikely(vq->iov[0].iov_len != sizeof(v_req))) {
633 vq_err(vq, "Expecting virtio_scsi_cmd_req, got %zu"
634 " bytes\n", vq->iov[0].iov_len);
635 break;
636 }
637 pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p,"
638 " len: %zu\n", vq->iov[0].iov_base, sizeof(v_req));
639 ret = __copy_from_user(&v_req, vq->iov[0].iov_base,
640 sizeof(v_req));
641 if (unlikely(ret)) {
642 vq_err(vq, "Faulted on virtio_scsi_cmd_req\n");
643 break;
644 }
645
646 exp_data_len = 0;
647 for (i = 0; i < data_num; i++)
648 exp_data_len += vq->iov[data_first + i].iov_len;
649
650 tv_cmd = vhost_scsi_allocate_cmd(tv_tpg, &v_req,
651 exp_data_len, data_direction);
652 if (IS_ERR(tv_cmd)) {
653 vq_err(vq, "vhost_scsi_allocate_cmd failed %ld\n",
654 PTR_ERR(tv_cmd));
655 break;
656 }
657 pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
658 ": %d\n", tv_cmd, exp_data_len, data_direction);
659
660 tv_cmd->tvc_vhost = vs;
661
662 if (unlikely(vq->iov[out].iov_len !=
663 sizeof(struct virtio_scsi_cmd_resp))) {
664 vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
665 " bytes, out: %d, in: %d\n",
666 vq->iov[out].iov_len, out, in);
667 break;
668 }
669
670 tv_cmd->tvc_resp = vq->iov[out].iov_base;
671
672 /*
673 * Copy in the recieved CDB descriptor into tv_cmd->tvc_cdb
674 * that will be used by tcm_vhost_new_cmd_map() and down into
675 * target_setup_cmd_from_cdb()
676 */
677 memcpy(tv_cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE);
678 /*
679 * Check that the recieved CDB size does not exceeded our
680 * hardcoded max for tcm_vhost
681 */
682 /* TODO what if cdb was too small for varlen cdb header? */
683 if (unlikely(scsi_command_size(tv_cmd->tvc_cdb) >
684 TCM_VHOST_MAX_CDB_SIZE)) {
685 vq_err(vq, "Received SCSI CDB with command_size: %d that"
686 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
687 scsi_command_size(tv_cmd->tvc_cdb),
688 TCM_VHOST_MAX_CDB_SIZE);
689 break; /* TODO */
690 }
691 tv_cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
692
693 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
694 tv_cmd->tvc_cdb[0], tv_cmd->tvc_lun);
695
696 if (data_direction != DMA_NONE) {
697 ret = vhost_scsi_map_iov_to_sgl(tv_cmd,
698 &vq->iov[data_first], data_num,
699 data_direction == DMA_TO_DEVICE);
700 if (unlikely(ret)) {
701 vq_err(vq, "Failed to map iov to sgl\n");
702 break; /* TODO */
703 }
704 }
705
706 /*
707 * Save the descriptor from vhost_get_vq_desc() to be used to
708 * complete the virtio-scsi request in TCM callback context via
709 * tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
710 */
711 tv_cmd->tvc_vq_desc = head;
712 /*
713 * Dispatch tv_cmd descriptor for cmwq execution in process
714 * context provided by tcm_vhost_workqueue. This also ensures
715 * tv_cmd is executed on the same kworker CPU as this vhost
716 * thread to gain positive L2 cache locality effects..
717 */
718 INIT_WORK(&tv_cmd->work, tcm_vhost_submission_work);
719 queue_work(tcm_vhost_workqueue, &tv_cmd->work);
720 }
721
722 mutex_unlock(&vq->mutex);
723}
724
725static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
726{
101998f6 727 pr_debug("%s: The handling func for control queue.\n", __func__);
057cbf49
NB		 728}
729
730static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
731{
101998f6 732 pr_debug("%s: The handling func for event queue.\n", __func__);
057cbf49
NB		 733}
734
735static void vhost_scsi_handle_kick(struct vhost_work *work)
736{
737 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
738 poll.work);
739 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
740
741 vhost_scsi_handle_vq(vs);
742}
743
744/*
745 * Called from vhost_scsi_ioctl() context to walk the list of available
746 * tcm_vhost_tpg with an active struct tcm_vhost_nexus
747 */
748static int vhost_scsi_set_endpoint(
749 struct vhost_scsi *vs,
750 struct vhost_scsi_target *t)
751{
752 struct tcm_vhost_tport *tv_tport;
753 struct tcm_vhost_tpg *tv_tpg;
754 int index;
755
756 mutex_lock(&vs->dev.mutex);
757 /* Verify that ring has been setup correctly. */
758 for (index = 0; index < vs->dev.nvqs; ++index) {
759 /* Verify that ring has been setup correctly. */
760 if (!vhost_vq_access_ok(&vs->vqs[index])) {
761 mutex_unlock(&vs->dev.mutex);
762 return -EFAULT;
763 }
764 }
057cbf49
NB		 765 mutex_unlock(&vs->dev.mutex);
766
767 mutex_lock(&tcm_vhost_mutex);
768 list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) {
769 mutex_lock(&tv_tpg->tv_tpg_mutex);
770 if (!tv_tpg->tpg_nexus) {
771 mutex_unlock(&tv_tpg->tv_tpg_mutex);
772 continue;
773 }
101998f6 774 if (tv_tpg->tv_tpg_vhost_count != 0) {
057cbf49
NB		 775 mutex_unlock(&tv_tpg->tv_tpg_mutex);
776 continue;
777 }
778 tv_tport = tv_tpg->tport;
779
780 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn) &&
781 (tv_tpg->tport_tpgt == t->vhost_tpgt)) {
101998f6 782 tv_tpg->tv_tpg_vhost_count++;
057cbf49
NB		 783 mutex_unlock(&tv_tpg->tv_tpg_mutex);
784 mutex_unlock(&tcm_vhost_mutex);
785
786 mutex_lock(&vs->dev.mutex);
101998f6
NB		 787 if (vs->vs_tpg) {
788 mutex_unlock(&vs->dev.mutex);
789 mutex_lock(&tv_tpg->tv_tpg_mutex);
790 tv_tpg->tv_tpg_vhost_count--;
791 mutex_unlock(&tv_tpg->tv_tpg_mutex);
792 return -EEXIST;
793 }
794
057cbf49 795 vs->vs_tpg = tv_tpg;
057cbf49
NB		 796 smp_mb__after_atomic_inc();
797 mutex_unlock(&vs->dev.mutex);
798 return 0;
799 }
800 mutex_unlock(&tv_tpg->tv_tpg_mutex);
801 }
802 mutex_unlock(&tcm_vhost_mutex);
803 return -EINVAL;
804}
805
806static int vhost_scsi_clear_endpoint(
807 struct vhost_scsi *vs,
808 struct vhost_scsi_target *t)
809{
810 struct tcm_vhost_tport *tv_tport;
811 struct tcm_vhost_tpg *tv_tpg;
101998f6 812 int index, ret;
057cbf49
NB		 813
814 mutex_lock(&vs->dev.mutex);
815 /* Verify that ring has been setup correctly. */
816 for (index = 0; index < vs->dev.nvqs; ++index) {
817 if (!vhost_vq_access_ok(&vs->vqs[index])) {
101998f6
NB		 818 ret = -EFAULT;
819 goto err;
057cbf49
NB		 820 }
821 }
822
823 if (!vs->vs_tpg) {
101998f6
NB		 824 ret = -ENODEV;
825 goto err;
057cbf49
NB		 826 }
827 tv_tpg = vs->vs_tpg;
828 tv_tport = tv_tpg->tport;
829
830 if (strcmp(tv_tport->tport_name, t->vhost_wwpn) ||
831 (tv_tpg->tport_tpgt != t->vhost_tpgt)) {
057cbf49
NB		 832 pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu"
833 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
834 tv_tport->tport_name, tv_tpg->tport_tpgt,
835 t->vhost_wwpn, t->vhost_tpgt);
101998f6
NB		 836 ret = -EINVAL;
837 goto err;
057cbf49 838 }
101998f6 839 tv_tpg->tv_tpg_vhost_count--;
057cbf49
NB		 840 vs->vs_tpg = NULL;
841 mutex_unlock(&vs->dev.mutex);
842
843 return 0;
101998f6
NB		 844
845err:
846 mutex_unlock(&vs->dev.mutex);
847 return ret;
057cbf49
NB		 848}
849
850static int vhost_scsi_open(struct inode *inode, struct file *f)
851{
852 struct vhost_scsi *s;
853 int r;
854
855 s = kzalloc(sizeof(*s), GFP_KERNEL);
856 if (!s)
857 return -ENOMEM;
858
859 vhost_work_init(&s->vs_completion_work, vhost_scsi_complete_cmd_work);
860 INIT_LIST_HEAD(&s->vs_completion_list);
861 spin_lock_init(&s->vs_completion_lock);
862
101998f6
NB		 863 s->vqs[VHOST_SCSI_VQ_CTL].handle_kick = vhost_scsi_ctl_handle_kick;
864 s->vqs[VHOST_SCSI_VQ_EVT].handle_kick = vhost_scsi_evt_handle_kick;
865 s->vqs[VHOST_SCSI_VQ_IO].handle_kick = vhost_scsi_handle_kick;
057cbf49
NB		 866 r = vhost_dev_init(&s->dev, s->vqs, 3);
867 if (r < 0) {
868 kfree(s);
869 return r;
870 }
871
872 f->private_data = s;
873 return 0;
874}
875
876static int vhost_scsi_release(struct inode *inode, struct file *f)
877{
878 struct vhost_scsi *s = f->private_data;
879
880 if (s->vs_tpg && s->vs_tpg->tport) {
881 struct vhost_scsi_target backend;
882
883 memcpy(backend.vhost_wwpn, s->vs_tpg->tport->tport_name,
884 sizeof(backend.vhost_wwpn));
885 backend.vhost_tpgt = s->vs_tpg->tport_tpgt;
886 vhost_scsi_clear_endpoint(s, &backend);
887 }
888
b211616d 889 vhost_dev_stop(&s->dev);
057cbf49
NB		 890 vhost_dev_cleanup(&s->dev, false);
891 kfree(s);
892 return 0;
893}
894
101998f6
NB		 895static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
896{
897 vhost_poll_flush(&vs->dev.vqs[index].poll);
898}
899
900static void vhost_scsi_flush(struct vhost_scsi *vs)
901{
902 vhost_scsi_flush_vq(vs, VHOST_SCSI_VQ_CTL);
903 vhost_scsi_flush_vq(vs, VHOST_SCSI_VQ_EVT);
904 vhost_scsi_flush_vq(vs, VHOST_SCSI_VQ_IO);
905}
906
057cbf49
NB		 907static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
908{
909 if (features & ~VHOST_FEATURES)
910 return -EOPNOTSUPP;
911
912 mutex_lock(&vs->dev.mutex);
913 if ((features & (1 << VHOST_F_LOG_ALL)) &&
914 !vhost_log_access_ok(&vs->dev)) {
915 mutex_unlock(&vs->dev.mutex);
916 return -EFAULT;
917 }
918 vs->dev.acked_features = features;
101998f6
NB		 919 smp_wmb();
920 vhost_scsi_flush(vs);
057cbf49
NB		 921 mutex_unlock(&vs->dev.mutex);
922 return 0;
923}
924
925static long vhost_scsi_ioctl(struct file *f, unsigned int ioctl,
926 unsigned long arg)
927{
928 struct vhost_scsi *vs = f->private_data;
929 struct vhost_scsi_target backend;
930 void __user *argp = (void __user *)arg;
931 u64 __user *featurep = argp;
932 u64 features;
101998f6 933 int r, abi_version = VHOST_SCSI_ABI_VERSION;
057cbf49
NB		 934
935 switch (ioctl) {
936 case VHOST_SCSI_SET_ENDPOINT:
937 if (copy_from_user(&backend, argp, sizeof backend))
938 return -EFAULT;
6de7145c
MT		 939 if (backend.reserved != 0)
940 return -EOPNOTSUPP;
057cbf49
NB		 941
942 return vhost_scsi_set_endpoint(vs, &backend);
943 case VHOST_SCSI_CLEAR_ENDPOINT:
944 if (copy_from_user(&backend, argp, sizeof backend))
945 return -EFAULT;
6de7145c
MT		 946 if (backend.reserved != 0)
947 return -EOPNOTSUPP;
057cbf49
NB		 948
949 return vhost_scsi_clear_endpoint(vs, &backend);
950 case VHOST_SCSI_GET_ABI_VERSION:
101998f6 951 if (copy_to_user(argp, &abi_version, sizeof abi_version))
057cbf49
NB		 952 return -EFAULT;
953 return 0;
954 case VHOST_GET_FEATURES:
955 features = VHOST_FEATURES;
956 if (copy_to_user(featurep, &features, sizeof features))
957 return -EFAULT;
958 return 0;
959 case VHOST_SET_FEATURES:
960 if (copy_from_user(&features, featurep, sizeof features))
961 return -EFAULT;
962 return vhost_scsi_set_features(vs, features);
963 default:
964 mutex_lock(&vs->dev.mutex);
935cdee7
MT		 965 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
966 /* TODO: flush backend after dev ioctl. */
967 if (r == -ENOIOCTLCMD)
968 r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
057cbf49
NB		 969 mutex_unlock(&vs->dev.mutex);
970 return r;
971 }
972}
973
101998f6
NB		 974#ifdef CONFIG_COMPAT
975static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
976 unsigned long arg)
977{
978 return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
979}
980#endif
981
057cbf49
NB		 982static const struct file_operations vhost_scsi_fops = {
983 .owner = THIS_MODULE,
984 .release = vhost_scsi_release,
985 .unlocked_ioctl = vhost_scsi_ioctl,
101998f6
NB		 986#ifdef CONFIG_COMPAT
987 .compat_ioctl = vhost_scsi_compat_ioctl,
988#endif
057cbf49
NB		 989 .open = vhost_scsi_open,
990 .llseek = noop_llseek,
991};
992
993static struct miscdevice vhost_scsi_misc = {
994 MISC_DYNAMIC_MINOR,
995 "vhost-scsi",
996 &vhost_scsi_fops,
997};
998
999static int __init vhost_scsi_register(void)
1000{
1001 return misc_register(&vhost_scsi_misc);
1002}
1003
1004static int vhost_scsi_deregister(void)
1005{
1006 return misc_deregister(&vhost_scsi_misc);
1007}
1008
1009static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport)
1010{
1011 switch (tport->tport_proto_id) {
1012 case SCSI_PROTOCOL_SAS:
1013 return "SAS";
1014 case SCSI_PROTOCOL_FCP:
1015 return "FCP";
1016 case SCSI_PROTOCOL_ISCSI:
1017 return "iSCSI";
1018 default:
1019 break;
1020 }
1021
1022 return "Unknown";
1023}
1024
101998f6 1025static int tcm_vhost_port_link(struct se_portal_group *se_tpg,
057cbf49
NB		 1026 struct se_lun *lun)
1027{
1028 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1029 struct tcm_vhost_tpg, se_tpg);
1030
101998f6
NB		 1031 mutex_lock(&tv_tpg->tv_tpg_mutex);
1032 tv_tpg->tv_tpg_port_count++;
1033 mutex_unlock(&tv_tpg->tv_tpg_mutex);
057cbf49
NB		 1034
1035 return 0;
1036}
1037
101998f6 1038static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg,
057cbf49
NB		 1039 struct se_lun *se_lun)
1040{
1041 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1042 struct tcm_vhost_tpg, se_tpg);
1043
101998f6
NB		 1044 mutex_lock(&tv_tpg->tv_tpg_mutex);
1045 tv_tpg->tv_tpg_port_count--;
1046 mutex_unlock(&tv_tpg->tv_tpg_mutex);
057cbf49
NB		 1047}
1048
1049static struct se_node_acl *tcm_vhost_make_nodeacl(
1050 struct se_portal_group *se_tpg,
1051 struct config_group *group,
1052 const char *name)
1053{
1054 struct se_node_acl *se_nacl, *se_nacl_new;
1055 struct tcm_vhost_nacl *nacl;
1056 u64 wwpn = 0;
1057 u32 nexus_depth;
1058
1059 /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1060 return ERR_PTR(-EINVAL); */
1061 se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg);
1062 if (!se_nacl_new)
1063 return ERR_PTR(-ENOMEM);
1064
1065 nexus_depth = 1;
1066 /*
1067 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1068 * when converting a NodeACL from demo mode -> explict
1069 */
1070 se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1071 name, nexus_depth);
1072 if (IS_ERR(se_nacl)) {
1073 tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new);
1074 return se_nacl;
1075 }
1076 /*
1077 * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN
1078 */
1079 nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl);
1080 nacl->iport_wwpn = wwpn;
1081
1082 return se_nacl;
1083}
1084
1085static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl)
1086{
1087 struct tcm_vhost_nacl *nacl = container_of(se_acl,
1088 struct tcm_vhost_nacl, se_node_acl);
1089 core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1090 kfree(nacl);
1091}
1092
101998f6 1093static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tv_tpg,
057cbf49
NB		 1094 const char *name)
1095{
1096 struct se_portal_group *se_tpg;
1097 struct tcm_vhost_nexus *tv_nexus;
1098
1099 mutex_lock(&tv_tpg->tv_tpg_mutex);
1100 if (tv_tpg->tpg_nexus) {
1101 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1102 pr_debug("tv_tpg->tpg_nexus already exists\n");
1103 return -EEXIST;
1104 }
1105 se_tpg = &tv_tpg->se_tpg;
1106
1107 tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL);
1108 if (!tv_nexus) {
1109 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1110 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1111 return -ENOMEM;
1112 }
1113 /*
1114 * Initialize the struct se_session pointer
1115 */
1116 tv_nexus->tvn_se_sess = transport_init_session();
1117 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1118 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1119 kfree(tv_nexus);
1120 return -ENOMEM;
1121 }
1122 /*
1123 * Since we are running in 'demo mode' this call with generate a
1124 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1125 * the SCSI Initiator port name of the passed configfs group 'name'.
1126 */
1127 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1128 se_tpg, (unsigned char *)name);
1129 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1130 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1131 pr_debug("core_tpg_check_initiator_node_acl() failed"
1132 " for %s\n", name);
1133 transport_free_session(tv_nexus->tvn_se_sess);
1134 kfree(tv_nexus);
1135 return -ENOMEM;
1136 }
1137 /*
101998f6 1138 * Now register the TCM vhost virtual I_T Nexus as active with the
057cbf49
NB		 1139 * call to __transport_register_session()
1140 */
1141 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1142 tv_nexus->tvn_se_sess, tv_nexus);
1143 tv_tpg->tpg_nexus = tv_nexus;
1144
1145 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1146 return 0;
1147}
1148
101998f6 1149static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg *tpg)
057cbf49
NB		 1150{
1151 struct se_session *se_sess;
1152 struct tcm_vhost_nexus *tv_nexus;
1153
1154 mutex_lock(&tpg->tv_tpg_mutex);
1155 tv_nexus = tpg->tpg_nexus;
1156 if (!tv_nexus) {
1157 mutex_unlock(&tpg->tv_tpg_mutex);
1158 return -ENODEV;
1159 }
1160
1161 se_sess = tv_nexus->tvn_se_sess;
1162 if (!se_sess) {
1163 mutex_unlock(&tpg->tv_tpg_mutex);
1164 return -ENODEV;
1165 }
1166
101998f6 1167 if (tpg->tv_tpg_port_count != 0) {
057cbf49 1168 mutex_unlock(&tpg->tv_tpg_mutex);
101998f6 1169 pr_err("Unable to remove TCM_vhost I_T Nexus with"
057cbf49 1170 " active TPG port count: %d\n",
101998f6
NB		 1171 tpg->tv_tpg_port_count);
1172 return -EBUSY;
057cbf49
NB		 1173 }
1174
101998f6 1175 if (tpg->tv_tpg_vhost_count != 0) {
057cbf49 1176 mutex_unlock(&tpg->tv_tpg_mutex);
101998f6 1177 pr_err("Unable to remove TCM_vhost I_T Nexus with"
057cbf49 1178 " active TPG vhost count: %d\n",
101998f6
NB		 1179 tpg->tv_tpg_vhost_count);
1180 return -EBUSY;
057cbf49
NB		 1181 }
1182
101998f6 1183 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
057cbf49
NB		 1184 " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport),
1185 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1186 /*
101998f6 1187 * Release the SCSI I_T Nexus to the emulated vhost Target Port
057cbf49
NB		 1188 */
1189 transport_deregister_session(tv_nexus->tvn_se_sess);
1190 tpg->tpg_nexus = NULL;
1191 mutex_unlock(&tpg->tv_tpg_mutex);
1192
1193 kfree(tv_nexus);
1194 return 0;
1195}
1196
101998f6 1197static ssize_t tcm_vhost_tpg_show_nexus(struct se_portal_group *se_tpg,
057cbf49
NB		 1198 char *page)
1199{
1200 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1201 struct tcm_vhost_tpg, se_tpg);
1202 struct tcm_vhost_nexus *tv_nexus;
1203 ssize_t ret;
1204
1205 mutex_lock(&tv_tpg->tv_tpg_mutex);
1206 tv_nexus = tv_tpg->tpg_nexus;
1207 if (!tv_nexus) {
1208 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1209 return -ENODEV;
1210 }
1211 ret = snprintf(page, PAGE_SIZE, "%s\n",
1212 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1213 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1214
1215 return ret;
1216}
1217
101998f6 1218static ssize_t tcm_vhost_tpg_store_nexus(struct se_portal_group *se_tpg,
057cbf49
NB		 1219 const char *page,
1220 size_t count)
1221{
1222 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1223 struct tcm_vhost_tpg, se_tpg);
1224 struct tcm_vhost_tport *tport_wwn = tv_tpg->tport;
1225 unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr;
1226 int ret;
1227 /*
1228 * Shutdown the active I_T nexus if 'NULL' is passed..
1229 */
1230 if (!strncmp(page, "NULL", 4)) {
1231 ret = tcm_vhost_drop_nexus(tv_tpg);
1232 return (!ret) ? count : ret;
1233 }
1234 /*
1235 * Otherwise make sure the passed virtual Initiator port WWN matches
1236 * the fabric protocol_id set in tcm_vhost_make_tport(), and call
1237 * tcm_vhost_make_nexus().
1238 */
1239 if (strlen(page) >= TCM_VHOST_NAMELEN) {
1240 pr_err("Emulated NAA Sas Address: %s, exceeds"
1241 " max: %d\n", page, TCM_VHOST_NAMELEN);
1242 return -EINVAL;
1243 }
1244 snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page);
1245
1246 ptr = strstr(i_port, "naa.");
1247 if (ptr) {
1248 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1249 pr_err("Passed SAS Initiator Port %s does not"
1250 " match target port protoid: %s\n", i_port,
1251 tcm_vhost_dump_proto_id(tport_wwn));
1252 return -EINVAL;
1253 }
1254 port_ptr = &i_port[0];
1255 goto check_newline;
1256 }
1257 ptr = strstr(i_port, "fc.");
1258 if (ptr) {
1259 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1260 pr_err("Passed FCP Initiator Port %s does not"
1261 " match target port protoid: %s\n", i_port,
1262 tcm_vhost_dump_proto_id(tport_wwn));
1263 return -EINVAL;
1264 }
1265 port_ptr = &i_port[3]; /* Skip over "fc." */
1266 goto check_newline;
1267 }
1268 ptr = strstr(i_port, "iqn.");
1269 if (ptr) {
1270 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1271 pr_err("Passed iSCSI Initiator Port %s does not"
1272 " match target port protoid: %s\n", i_port,
1273 tcm_vhost_dump_proto_id(tport_wwn));
1274 return -EINVAL;
1275 }
1276 port_ptr = &i_port[0];
1277 goto check_newline;
1278 }
1279 pr_err("Unable to locate prefix for emulated Initiator Port:"
1280 " %s\n", i_port);
1281 return -EINVAL;
1282 /*
1283 * Clear any trailing newline for the NAA WWN
1284 */
1285check_newline:
1286 if (i_port[strlen(i_port)-1] == '\n')
1287 i_port[strlen(i_port)-1] = '\0';
1288
1289 ret = tcm_vhost_make_nexus(tv_tpg, port_ptr);
1290 if (ret < 0)
1291 return ret;
1292
1293 return count;
1294}
1295
1296TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR);
1297
1298static struct configfs_attribute *tcm_vhost_tpg_attrs[] = {
1299 &tcm_vhost_tpg_nexus.attr,
1300 NULL,
1301};
1302
101998f6 1303static struct se_portal_group *tcm_vhost_make_tpg(struct se_wwn *wwn,
057cbf49
NB		 1304 struct config_group *group,
1305 const char *name)
1306{
1307 struct tcm_vhost_tport *tport = container_of(wwn,
1308 struct tcm_vhost_tport, tport_wwn);
1309
1310 struct tcm_vhost_tpg *tpg;
1311 unsigned long tpgt;
1312 int ret;
1313
1314 if (strstr(name, "tpgt_") != name)
1315 return ERR_PTR(-EINVAL);
1316 if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
1317 return ERR_PTR(-EINVAL);
1318
1319 tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL);
1320 if (!tpg) {
1321 pr_err("Unable to allocate struct tcm_vhost_tpg");
1322 return ERR_PTR(-ENOMEM);
1323 }
1324 mutex_init(&tpg->tv_tpg_mutex);
1325 INIT_LIST_HEAD(&tpg->tv_tpg_list);
1326 tpg->tport = tport;
1327 tpg->tport_tpgt = tpgt;
1328
1329 ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn,
1330 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
1331 if (ret < 0) {
1332 kfree(tpg);
1333 return NULL;
1334 }
1335 mutex_lock(&tcm_vhost_mutex);
1336 list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list);
1337 mutex_unlock(&tcm_vhost_mutex);
1338
1339 return &tpg->se_tpg;
1340}
1341
1342static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg)
1343{
1344 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
1345 struct tcm_vhost_tpg, se_tpg);
1346
1347 mutex_lock(&tcm_vhost_mutex);
1348 list_del(&tpg->tv_tpg_list);
1349 mutex_unlock(&tcm_vhost_mutex);
1350 /*
101998f6 1351 * Release the virtual I_T Nexus for this vhost TPG
057cbf49
NB		 1352 */
1353 tcm_vhost_drop_nexus(tpg);
1354 /*
1355 * Deregister the se_tpg from TCM..
1356 */
1357 core_tpg_deregister(se_tpg);
1358 kfree(tpg);
1359}
1360
101998f6 1361static struct se_wwn *tcm_vhost_make_tport(struct target_fabric_configfs *tf,
057cbf49
NB		 1362 struct config_group *group,
1363 const char *name)
1364{
1365 struct tcm_vhost_tport *tport;
1366 char *ptr;
1367 u64 wwpn = 0;
1368 int off = 0;
1369
1370 /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1371 return ERR_PTR(-EINVAL); */
1372
1373 tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL);
1374 if (!tport) {
1375 pr_err("Unable to allocate struct tcm_vhost_tport");
1376 return ERR_PTR(-ENOMEM);
1377 }
1378 tport->tport_wwpn = wwpn;
1379 /*
1380 * Determine the emulated Protocol Identifier and Target Port Name
1381 * based on the incoming configfs directory name.
1382 */
1383 ptr = strstr(name, "naa.");
1384 if (ptr) {
1385 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
1386 goto check_len;
1387 }
1388 ptr = strstr(name, "fc.");
1389 if (ptr) {
1390 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
1391 off = 3; /* Skip over "fc." */
1392 goto check_len;
1393 }
1394 ptr = strstr(name, "iqn.");
1395 if (ptr) {
1396 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
1397 goto check_len;
1398 }
1399
1400 pr_err("Unable to locate prefix for emulated Target Port:"
1401 " %s\n", name);
1402 kfree(tport);
1403 return ERR_PTR(-EINVAL);
1404
1405check_len:
1406 if (strlen(name) >= TCM_VHOST_NAMELEN) {
1407 pr_err("Emulated %s Address: %s, exceeds"
1408 " max: %d\n", name, tcm_vhost_dump_proto_id(tport),
1409 TCM_VHOST_NAMELEN);
1410 kfree(tport);
1411 return ERR_PTR(-EINVAL);
1412 }
1413 snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]);
1414
1415 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
1416 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name);
1417
1418 return &tport->tport_wwn;
1419}
1420
1421static void tcm_vhost_drop_tport(struct se_wwn *wwn)
1422{
1423 struct tcm_vhost_tport *tport = container_of(wwn,
1424 struct tcm_vhost_tport, tport_wwn);
1425
1426 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
1427 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport),
1428 tport->tport_name);
1429
1430 kfree(tport);
1431}
1432
1433static ssize_t tcm_vhost_wwn_show_attr_version(
1434 struct target_fabric_configfs *tf,
1435 char *page)
1436{
1437 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
1438 "on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
1439 utsname()->machine);
1440}
1441
1442TF_WWN_ATTR_RO(tcm_vhost, version);
1443
1444static struct configfs_attribute *tcm_vhost_wwn_attrs[] = {
1445 &tcm_vhost_wwn_version.attr,
1446 NULL,
1447};
1448
1449static struct target_core_fabric_ops tcm_vhost_ops = {
1450 .get_fabric_name = tcm_vhost_get_fabric_name,
1451 .get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident,
1452 .tpg_get_wwn = tcm_vhost_get_fabric_wwn,
1453 .tpg_get_tag = tcm_vhost_get_tag,
1454 .tpg_get_default_depth = tcm_vhost_get_default_depth,
1455 .tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id,
1456 .tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len,
1457 .tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id,
1458 .tpg_check_demo_mode = tcm_vhost_check_true,
1459 .tpg_check_demo_mode_cache = tcm_vhost_check_true,
1460 .tpg_check_demo_mode_write_protect = tcm_vhost_check_false,
1461 .tpg_check_prod_mode_write_protect = tcm_vhost_check_false,
1462 .tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl,
1463 .tpg_release_fabric_acl = tcm_vhost_release_fabric_acl,
1464 .tpg_get_inst_index = tcm_vhost_tpg_get_inst_index,
1465 .release_cmd = tcm_vhost_release_cmd,
1466 .shutdown_session = tcm_vhost_shutdown_session,
1467 .close_session = tcm_vhost_close_session,
1468 .sess_get_index = tcm_vhost_sess_get_index,
1469 .sess_get_initiator_sid = NULL,
1470 .write_pending = tcm_vhost_write_pending,
1471 .write_pending_status = tcm_vhost_write_pending_status,
1472 .set_default_node_attributes = tcm_vhost_set_default_node_attrs,
1473 .get_task_tag = tcm_vhost_get_task_tag,
1474 .get_cmd_state = tcm_vhost_get_cmd_state,
1475 .queue_data_in = tcm_vhost_queue_data_in,
1476 .queue_status = tcm_vhost_queue_status,
1477 .queue_tm_rsp = tcm_vhost_queue_tm_rsp,
057cbf49
NB		 1478 /*
1479 * Setup callers for generic logic in target_core_fabric_configfs.c
1480 */
1481 .fabric_make_wwn = tcm_vhost_make_tport,
1482 .fabric_drop_wwn = tcm_vhost_drop_tport,
1483 .fabric_make_tpg = tcm_vhost_make_tpg,
1484 .fabric_drop_tpg = tcm_vhost_drop_tpg,
1485 .fabric_post_link = tcm_vhost_port_link,
1486 .fabric_pre_unlink = tcm_vhost_port_unlink,
1487 .fabric_make_np = NULL,
1488 .fabric_drop_np = NULL,
1489 .fabric_make_nodeacl = tcm_vhost_make_nodeacl,
1490 .fabric_drop_nodeacl = tcm_vhost_drop_nodeacl,
1491};
1492
1493static int tcm_vhost_register_configfs(void)
1494{
1495 struct target_fabric_configfs *fabric;
1496 int ret;
1497
1498 pr_debug("TCM_VHOST fabric module %s on %s/%s"
1499 " on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
1500 utsname()->machine);
1501 /*
1502 * Register the top level struct config_item_type with TCM core
1503 */
1504 fabric = target_fabric_configfs_init(THIS_MODULE, "vhost");
1505 if (IS_ERR(fabric)) {
1506 pr_err("target_fabric_configfs_init() failed\n");
1507 return PTR_ERR(fabric);
1508 }
1509 /*
1510 * Setup fabric->tf_ops from our local tcm_vhost_ops
1511 */
1512 fabric->tf_ops = tcm_vhost_ops;
1513 /*
1514 * Setup default attribute lists for various fabric->tf_cit_tmpl
1515 */
1516 TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs;
1517 TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs;
1518 TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1519 TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1520 TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1521 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
1522 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
1523 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
1524 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
1525 /*
1526 * Register the fabric for use within TCM
1527 */
1528 ret = target_fabric_configfs_register(fabric);
1529 if (ret < 0) {
1530 pr_err("target_fabric_configfs_register() failed"
1531 " for TCM_VHOST\n");
1532 return ret;
1533 }
1534 /*
1535 * Setup our local pointer to *fabric
1536 */
1537 tcm_vhost_fabric_configfs = fabric;
1538 pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n");
1539 return 0;
1540};
1541
1542static void tcm_vhost_deregister_configfs(void)
1543{
1544 if (!tcm_vhost_fabric_configfs)
1545 return;
1546
1547 target_fabric_configfs_deregister(tcm_vhost_fabric_configfs);
1548 tcm_vhost_fabric_configfs = NULL;
1549 pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n");
1550};
1551
1552static int __init tcm_vhost_init(void)
1553{
1554 int ret = -ENOMEM;
101998f6
NB		 1555 /*
1556 * Use our own dedicated workqueue for submitting I/O into
1557 * target core to avoid contention within system_wq.
1558 */
057cbf49
NB		 1559 tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0);
1560 if (!tcm_vhost_workqueue)
1561 goto out;
1562
1563 ret = vhost_scsi_register();
1564 if (ret < 0)
1565 goto out_destroy_workqueue;
1566
1567 ret = tcm_vhost_register_configfs();
1568 if (ret < 0)
1569 goto out_vhost_scsi_deregister;
1570
1571 return 0;
1572
1573out_vhost_scsi_deregister:
1574 vhost_scsi_deregister();
1575out_destroy_workqueue:
1576 destroy_workqueue(tcm_vhost_workqueue);
1577out:
1578 return ret;
1579};
1580
1581static void tcm_vhost_exit(void)
1582{
1583 tcm_vhost_deregister_configfs();
1584 vhost_scsi_deregister();
1585 destroy_workqueue(tcm_vhost_workqueue);
1586};
1587
1588MODULE_DESCRIPTION("TCM_VHOST series fabric driver");
1589MODULE_LICENSE("GPL");
1590module_init(tcm_vhost_init);
1591module_exit(tcm_vhost_exit);
Linux 6.x block layer and io_uring tree(s)