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