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tcm_vhost: Multi-target support
[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>
057cbf49
NB		 51
52#include "vhost.c"
53#include "vhost.h"
54#include "tcm_vhost.h"
55
101998f6
NB		 56enum {
57 VHOST_SCSI_VQ_CTL = 0,
58 VHOST_SCSI_VQ_EVT = 1,
59 VHOST_SCSI_VQ_IO = 2,
60};
61
67e18cf9
AH		 62#define VHOST_SCSI_MAX_TARGET 256
63
057cbf49 64struct vhost_scsi {
67e18cf9
AH		 65 /* Protected by vhost_scsi->dev.mutex */
66 struct tcm_vhost_tpg *vs_tpg[VHOST_SCSI_MAX_TARGET];
67 char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
68 bool vs_endpoint;
69
057cbf49
NB		 70 struct vhost_dev dev;
71 struct vhost_virtqueue vqs[3];
72
73 struct vhost_work vs_completion_work; /* cmd completion work item */
9d6064a3 74 struct llist_head vs_completion_list; /* cmd completion queue */
057cbf49
NB		 75};
76
77/* Local pointer to allocated TCM configfs fabric module */
78static struct target_fabric_configfs *tcm_vhost_fabric_configfs;
79
80static struct workqueue_struct *tcm_vhost_workqueue;
81
82/* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */
83static DEFINE_MUTEX(tcm_vhost_mutex);
84static LIST_HEAD(tcm_vhost_list);
85
765b34fd
AH		 86static int iov_num_pages(struct iovec *iov)
87{
88 return (PAGE_ALIGN((unsigned long)iov->iov_base + iov->iov_len) -
89 ((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT;
90}
91
057cbf49
NB		 92static int tcm_vhost_check_true(struct se_portal_group *se_tpg)
93{
94 return 1;
95}
96
97static int tcm_vhost_check_false(struct se_portal_group *se_tpg)
98{
99 return 0;
100}
101
102static char *tcm_vhost_get_fabric_name(void)
103{
104 return "vhost";
105}
106
107static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg)
108{
109 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
110 struct tcm_vhost_tpg, se_tpg);
111 struct tcm_vhost_tport *tport = tpg->tport;
112
113 switch (tport->tport_proto_id) {
114 case SCSI_PROTOCOL_SAS:
115 return sas_get_fabric_proto_ident(se_tpg);
116 case SCSI_PROTOCOL_FCP:
117 return fc_get_fabric_proto_ident(se_tpg);
118 case SCSI_PROTOCOL_ISCSI:
119 return iscsi_get_fabric_proto_ident(se_tpg);
120 default:
121 pr_err("Unknown tport_proto_id: 0x%02x, using"
122 " SAS emulation\n", tport->tport_proto_id);
123 break;
124 }
125
126 return sas_get_fabric_proto_ident(se_tpg);
127}
128
129static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg)
130{
131 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
132 struct tcm_vhost_tpg, se_tpg);
133 struct tcm_vhost_tport *tport = tpg->tport;
134
135 return &tport->tport_name[0];
136}
137
138static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg)
139{
140 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
141 struct tcm_vhost_tpg, se_tpg);
142 return tpg->tport_tpgt;
143}
144
145static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg)
146{
147 return 1;
148}
149
101998f6 150static u32 tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg,
057cbf49
NB		 151 struct se_node_acl *se_nacl,
152 struct t10_pr_registration *pr_reg,
153 int *format_code,
154 unsigned char *buf)
155{
156 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
157 struct tcm_vhost_tpg, se_tpg);
158 struct tcm_vhost_tport *tport = tpg->tport;
159
160 switch (tport->tport_proto_id) {
161 case SCSI_PROTOCOL_SAS:
162 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
163 format_code, buf);
164 case SCSI_PROTOCOL_FCP:
165 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
166 format_code, buf);
167 case SCSI_PROTOCOL_ISCSI:
168 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
169 format_code, buf);
170 default:
171 pr_err("Unknown tport_proto_id: 0x%02x, using"
172 " SAS emulation\n", tport->tport_proto_id);
173 break;
174 }
175
176 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
177 format_code, buf);
178}
179
101998f6 180static u32 tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg,
057cbf49
NB		 181 struct se_node_acl *se_nacl,
182 struct t10_pr_registration *pr_reg,
183 int *format_code)
184{
185 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
186 struct tcm_vhost_tpg, se_tpg);
187 struct tcm_vhost_tport *tport = tpg->tport;
188
189 switch (tport->tport_proto_id) {
190 case SCSI_PROTOCOL_SAS:
191 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
192 format_code);
193 case SCSI_PROTOCOL_FCP:
194 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
195 format_code);
196 case SCSI_PROTOCOL_ISCSI:
197 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
198 format_code);
199 default:
200 pr_err("Unknown tport_proto_id: 0x%02x, using"
201 " SAS emulation\n", tport->tport_proto_id);
202 break;
203 }
204
205 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
206 format_code);
207}
208
101998f6 209static char *tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
057cbf49
NB		 210 const char *buf,
211 u32 *out_tid_len,
212 char **port_nexus_ptr)
213{
214 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
215 struct tcm_vhost_tpg, se_tpg);
216 struct tcm_vhost_tport *tport = tpg->tport;
217
218 switch (tport->tport_proto_id) {
219 case SCSI_PROTOCOL_SAS:
220 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
221 port_nexus_ptr);
222 case SCSI_PROTOCOL_FCP:
223 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
224 port_nexus_ptr);
225 case SCSI_PROTOCOL_ISCSI:
226 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
227 port_nexus_ptr);
228 default:
229 pr_err("Unknown tport_proto_id: 0x%02x, using"
230 " SAS emulation\n", tport->tport_proto_id);
231 break;
232 }
233
234 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
235 port_nexus_ptr);
236}
237
238static struct se_node_acl *tcm_vhost_alloc_fabric_acl(
239 struct se_portal_group *se_tpg)
240{
241 struct tcm_vhost_nacl *nacl;
242
243 nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL);
244 if (!nacl) {
744627e9 245 pr_err("Unable to allocate struct tcm_vhost_nacl\n");
057cbf49
NB		 246 return NULL;
247 }
248
249 return &nacl->se_node_acl;
250}
251
101998f6 252static void tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg,
057cbf49
NB		 253 struct se_node_acl *se_nacl)
254{
255 struct tcm_vhost_nacl *nacl = container_of(se_nacl,
256 struct tcm_vhost_nacl, se_node_acl);
257 kfree(nacl);
258}
259
260static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg)
261{
262 return 1;
263}
264
265static void tcm_vhost_release_cmd(struct se_cmd *se_cmd)
266{
267 return;
268}
269
270static int tcm_vhost_shutdown_session(struct se_session *se_sess)
271{
272 return 0;
273}
274
275static void tcm_vhost_close_session(struct se_session *se_sess)
276{
277 return;
278}
279
280static u32 tcm_vhost_sess_get_index(struct se_session *se_sess)
281{
282 return 0;
283}
284
285static int tcm_vhost_write_pending(struct se_cmd *se_cmd)
286{
287 /* Go ahead and process the write immediately */
288 target_execute_cmd(se_cmd);
289 return 0;
290}
291
292static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd)
293{
294 return 0;
295}
296
297static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl)
298{
299 return;
300}
301
302static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd)
303{
304 return 0;
305}
306
307static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd)
308{
309 return 0;
310}
311
101998f6
NB		 312static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *tv_cmd)
313{
314 struct vhost_scsi *vs = tv_cmd->tvc_vhost;
315
9d6064a3 316 llist_add(&tv_cmd->tvc_completion_list, &vs->vs_completion_list);
101998f6
NB		 317
318 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
319}
057cbf49
NB		 320
321static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd)
322{
323 struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
324 struct tcm_vhost_cmd, tvc_se_cmd);
325 vhost_scsi_complete_cmd(tv_cmd);
326 return 0;
327}
328
329static int tcm_vhost_queue_status(struct se_cmd *se_cmd)
330{
331 struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
332 struct tcm_vhost_cmd, tvc_se_cmd);
333 vhost_scsi_complete_cmd(tv_cmd);
334 return 0;
335}
336
337static int tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd)
338{
339 return 0;
340}
341
057cbf49
NB		 342static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd)
343{
344 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
345
346 /* TODO locking against target/backend threads? */
347 transport_generic_free_cmd(se_cmd, 1);
348
349 if (tv_cmd->tvc_sgl_count) {
350 u32 i;
351 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
352 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
353
354 kfree(tv_cmd->tvc_sgl);
355 }
356
357 kfree(tv_cmd);
358}
359
057cbf49
NB		 360/* Fill in status and signal that we are done processing this command
361 *
362 * This is scheduled in the vhost work queue so we are called with the owner
363 * process mm and can access the vring.
364 */
365static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
366{
367 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
368 vs_completion_work);
9d6064a3 369 struct virtio_scsi_cmd_resp v_rsp;
057cbf49 370 struct tcm_vhost_cmd *tv_cmd;
9d6064a3
AH		 371 struct llist_node *llnode;
372 struct se_cmd *se_cmd;
373 int ret;
057cbf49 374
9d6064a3
AH		 375 llnode = llist_del_all(&vs->vs_completion_list);
376 while (llnode) {
377 tv_cmd = llist_entry(llnode, struct tcm_vhost_cmd,
378 tvc_completion_list);
379 llnode = llist_next(llnode);
380 se_cmd = &tv_cmd->tvc_se_cmd;
057cbf49
NB		 381
382 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
383 tv_cmd, se_cmd->residual_count, se_cmd->scsi_status);
384
385 memset(&v_rsp, 0, sizeof(v_rsp));
386 v_rsp.resid = se_cmd->residual_count;
387 /* TODO is status_qualifier field needed? */
388 v_rsp.status = se_cmd->scsi_status;
389 v_rsp.sense_len = se_cmd->scsi_sense_length;
390 memcpy(v_rsp.sense, tv_cmd->tvc_sense_buf,
391 v_rsp.sense_len);
392 ret = copy_to_user(tv_cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
393 if (likely(ret == 0))
394 vhost_add_used(&vs->vqs[2], tv_cmd->tvc_vq_desc, 0);
395 else
396 pr_err("Faulted on virtio_scsi_cmd_resp\n");
397
398 vhost_scsi_free_cmd(tv_cmd);
399 }
400
401 vhost_signal(&vs->dev, &vs->vqs[2]);
402}
403
057cbf49
NB		 404static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd(
405 struct tcm_vhost_tpg *tv_tpg,
406 struct virtio_scsi_cmd_req *v_req,
407 u32 exp_data_len,
408 int data_direction)
409{
410 struct tcm_vhost_cmd *tv_cmd;
411 struct tcm_vhost_nexus *tv_nexus;
057cbf49
NB		 412
413 tv_nexus = tv_tpg->tpg_nexus;
414 if (!tv_nexus) {
415 pr_err("Unable to locate active struct tcm_vhost_nexus\n");
416 return ERR_PTR(-EIO);
417 }
057cbf49
NB		 418
419 tv_cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC);
420 if (!tv_cmd) {
421 pr_err("Unable to allocate struct tcm_vhost_cmd\n");
422 return ERR_PTR(-ENOMEM);
423 }
057cbf49 424 tv_cmd->tvc_tag = v_req->tag;
9f0abc15
NB		 425 tv_cmd->tvc_task_attr = v_req->task_attr;
426 tv_cmd->tvc_exp_data_len = exp_data_len;
427 tv_cmd->tvc_data_direction = data_direction;
428 tv_cmd->tvc_nexus = tv_nexus;
057cbf49 429
057cbf49
NB		 430 return tv_cmd;
431}
432
433/*
434 * Map a user memory range into a scatterlist
435 *
436 * Returns the number of scatterlist entries used or -errno on error.
437 */
438static int vhost_scsi_map_to_sgl(struct scatterlist *sgl,
1810053e 439 unsigned int sgl_count, struct iovec *iov, int write)
057cbf49 440{
1810053e 441 unsigned int npages = 0, pages_nr, offset, nbytes;
057cbf49 442 struct scatterlist *sg = sgl;
1810053e
AH		 443 void __user *ptr = iov->iov_base;
444 size_t len = iov->iov_len;
445 struct page **pages;
446 int ret, i;
057cbf49 447
1810053e
AH		 448 pages_nr = iov_num_pages(iov);
449 if (pages_nr > sgl_count)
450 return -ENOBUFS;
057cbf49 451
1810053e
AH		 452 pages = kmalloc(pages_nr * sizeof(struct page *), GFP_KERNEL);
453 if (!pages)
454 return -ENOMEM;
057cbf49 455
1810053e
AH		 456 ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
457 /* No pages were pinned */
458 if (ret < 0)
459 goto out;
460 /* Less pages pinned than wanted */
461 if (ret != pages_nr) {
462 for (i = 0; i < ret; i++)
463 put_page(pages[i]);
464 ret = -EFAULT;
465 goto out;
466 }
467
468 while (len > 0) {
469 offset = (uintptr_t)ptr & ~PAGE_MASK;
470 nbytes = min_t(unsigned int, PAGE_SIZE - offset, len);
471 sg_set_page(sg, pages[npages], nbytes, offset);
057cbf49
NB		 472 ptr += nbytes;
473 len -= nbytes;
474 sg++;
475 npages++;
476 }
057cbf49 477
1810053e
AH		 478out:
479 kfree(pages);
057cbf49
NB		 480 return ret;
481}
482
483static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd,
484 struct iovec *iov, unsigned int niov, int write)
485{
486 int ret;
487 unsigned int i;
488 u32 sgl_count;
489 struct scatterlist *sg;
490
491 /*
492 * Find out how long sglist needs to be
493 */
494 sgl_count = 0;
f3158f36
AH		 495 for (i = 0; i < niov; i++)
496 sgl_count += iov_num_pages(&iov[i]);
497
057cbf49
NB		 498 /* TODO overflow checking */
499
500 sg = kmalloc(sizeof(tv_cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC);
501 if (!sg)
502 return -ENOMEM;
f0e0e9bb
FW		 503 pr_debug("%s sg %p sgl_count %u is_err %d\n", __func__,
504 sg, sgl_count, !sg);
057cbf49
NB		 505 sg_init_table(sg, sgl_count);
506
507 tv_cmd->tvc_sgl = sg;
508 tv_cmd->tvc_sgl_count = sgl_count;
509
510 pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count);
511 for (i = 0; i < niov; i++) {
1810053e 512 ret = vhost_scsi_map_to_sgl(sg, sgl_count, &iov[i], write);
057cbf49
NB		 513 if (ret < 0) {
514 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
515 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
516 kfree(tv_cmd->tvc_sgl);
517 tv_cmd->tvc_sgl = NULL;
518 tv_cmd->tvc_sgl_count = 0;
519 return ret;
520 }
521
522 sg += ret;
523 sgl_count -= ret;
524 }
525 return 0;
526}
527
528static void tcm_vhost_submission_work(struct work_struct *work)
529{
530 struct tcm_vhost_cmd *tv_cmd =
531 container_of(work, struct tcm_vhost_cmd, work);
9f0abc15 532 struct tcm_vhost_nexus *tv_nexus;
057cbf49
NB		 533 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
534 struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL;
535 int rc, sg_no_bidi = 0;
057cbf49
NB		 536
537 if (tv_cmd->tvc_sgl_count) {
538 sg_ptr = tv_cmd->tvc_sgl;
057cbf49
NB		 539/* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */
540#if 0
541 if (se_cmd->se_cmd_flags & SCF_BIDI) {
542 sg_bidi_ptr = NULL;
543 sg_no_bidi = 0;
544 }
545#endif
546 } else {
547 sg_ptr = NULL;
548 }
9f0abc15
NB		 549 tv_nexus = tv_cmd->tvc_nexus;
550
551 rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
552 tv_cmd->tvc_cdb, &tv_cmd->tvc_sense_buf[0],
553 tv_cmd->tvc_lun, tv_cmd->tvc_exp_data_len,
554 tv_cmd->tvc_task_attr, tv_cmd->tvc_data_direction,
555 0, sg_ptr, tv_cmd->tvc_sgl_count,
556 sg_bidi_ptr, sg_no_bidi);
057cbf49
NB		 557 if (rc < 0) {
558 transport_send_check_condition_and_sense(se_cmd,
9f0abc15 559 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
057cbf49 560 transport_generic_free_cmd(se_cmd, 0);
057cbf49 561 }
057cbf49
NB		 562}
563
564static void vhost_scsi_handle_vq(struct vhost_scsi *vs)
565{
566 struct vhost_virtqueue *vq = &vs->vqs[2];
567 struct virtio_scsi_cmd_req v_req;
568 struct tcm_vhost_tpg *tv_tpg;
569 struct tcm_vhost_cmd *tv_cmd;
570 u32 exp_data_len, data_first, data_num, data_direction;
571 unsigned out, in, i;
572 int head, ret;
67e18cf9 573 u8 target;
057cbf49
NB		 574
575 /* Must use ioctl VHOST_SCSI_SET_ENDPOINT */
67e18cf9 576 if (unlikely(!vs->vs_endpoint))
057cbf49 577 return;
057cbf49
NB		 578
579 mutex_lock(&vq->mutex);
580 vhost_disable_notify(&vs->dev, vq);
581
582 for (;;) {
583 head = vhost_get_vq_desc(&vs->dev, vq, vq->iov,
584 ARRAY_SIZE(vq->iov), &out, &in,
585 NULL, NULL);
586 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
587 head, out, in);
588 /* On error, stop handling until the next kick. */
589 if (unlikely(head < 0))
590 break;
591 /* Nothing new? Wait for eventfd to tell us they refilled. */
592 if (head == vq->num) {
593 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
594 vhost_disable_notify(&vs->dev, vq);
595 continue;
596 }
597 break;
598 }
599
600/* FIXME: BIDI operation */
601 if (out == 1 && in == 1) {
602 data_direction = DMA_NONE;
603 data_first = 0;
604 data_num = 0;
605 } else if (out == 1 && in > 1) {
606 data_direction = DMA_FROM_DEVICE;
607 data_first = out + 1;
608 data_num = in - 1;
609 } else if (out > 1 && in == 1) {
610 data_direction = DMA_TO_DEVICE;
611 data_first = 1;
612 data_num = out - 1;
613 } else {
614 vq_err(vq, "Invalid buffer layout out: %u in: %u\n",
615 out, in);
616 break;
617 }
618
619 /*
620 * Check for a sane resp buffer so we can report errors to
621 * the guest.
622 */
623 if (unlikely(vq->iov[out].iov_len !=
624 sizeof(struct virtio_scsi_cmd_resp))) {
625 vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
626 " bytes\n", vq->iov[out].iov_len);
627 break;
628 }
629
630 if (unlikely(vq->iov[0].iov_len != sizeof(v_req))) {
631 vq_err(vq, "Expecting virtio_scsi_cmd_req, got %zu"
632 " bytes\n", vq->iov[0].iov_len);
633 break;
634 }
635 pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p,"
636 " len: %zu\n", vq->iov[0].iov_base, sizeof(v_req));
637 ret = __copy_from_user(&v_req, vq->iov[0].iov_base,
638 sizeof(v_req));
639 if (unlikely(ret)) {
640 vq_err(vq, "Faulted on virtio_scsi_cmd_req\n");
641 break;
642 }
643
67e18cf9
AH		 644 /* Extract the tpgt */
645 target = v_req.lun[1];
646 tv_tpg = vs->vs_tpg[target];
647
648 /* Target does not exist, fail the request */
649 if (unlikely(!tv_tpg)) {
650 struct virtio_scsi_cmd_resp __user *resp;
651 struct virtio_scsi_cmd_resp rsp;
652
653 memset(&rsp, 0, sizeof(rsp));
654 rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
655 resp = vq->iov[out].iov_base;
656 ret = __copy_to_user(resp, &rsp, sizeof(rsp));
657 if (!ret)
658 vhost_add_used_and_signal(&vs->dev,
659 &vs->vqs[2], head, 0);
660 else
661 pr_err("Faulted on virtio_scsi_cmd_resp\n");
662
663 continue;
664 }
665
057cbf49
NB		 666 exp_data_len = 0;
667 for (i = 0; i < data_num; i++)
668 exp_data_len += vq->iov[data_first + i].iov_len;
669
670 tv_cmd = vhost_scsi_allocate_cmd(tv_tpg, &v_req,
671 exp_data_len, data_direction);
672 if (IS_ERR(tv_cmd)) {
673 vq_err(vq, "vhost_scsi_allocate_cmd failed %ld\n",
674 PTR_ERR(tv_cmd));
675 break;
676 }
677 pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
678 ": %d\n", tv_cmd, exp_data_len, data_direction);
679
680 tv_cmd->tvc_vhost = vs;
681
682 if (unlikely(vq->iov[out].iov_len !=
683 sizeof(struct virtio_scsi_cmd_resp))) {
684 vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
685 " bytes, out: %d, in: %d\n",
686 vq->iov[out].iov_len, out, in);
687 break;
688 }
689
690 tv_cmd->tvc_resp = vq->iov[out].iov_base;
691
692 /*
693 * Copy in the recieved CDB descriptor into tv_cmd->tvc_cdb
694 * that will be used by tcm_vhost_new_cmd_map() and down into
695 * target_setup_cmd_from_cdb()
696 */
697 memcpy(tv_cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE);
698 /*
699 * Check that the recieved CDB size does not exceeded our
700 * hardcoded max for tcm_vhost
701 */
702 /* TODO what if cdb was too small for varlen cdb header? */
703 if (unlikely(scsi_command_size(tv_cmd->tvc_cdb) >
704 TCM_VHOST_MAX_CDB_SIZE)) {
705 vq_err(vq, "Received SCSI CDB with command_size: %d that"
706 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
707 scsi_command_size(tv_cmd->tvc_cdb),
708 TCM_VHOST_MAX_CDB_SIZE);
709 break; /* TODO */
710 }
711 tv_cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
712
713 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
714 tv_cmd->tvc_cdb[0], tv_cmd->tvc_lun);
715
716 if (data_direction != DMA_NONE) {
717 ret = vhost_scsi_map_iov_to_sgl(tv_cmd,
718 &vq->iov[data_first], data_num,
719 data_direction == DMA_TO_DEVICE);
720 if (unlikely(ret)) {
721 vq_err(vq, "Failed to map iov to sgl\n");
722 break; /* TODO */
723 }
724 }
725
726 /*
727 * Save the descriptor from vhost_get_vq_desc() to be used to
728 * complete the virtio-scsi request in TCM callback context via
729 * tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
730 */
731 tv_cmd->tvc_vq_desc = head;
732 /*
733 * Dispatch tv_cmd descriptor for cmwq execution in process
734 * context provided by tcm_vhost_workqueue. This also ensures
735 * tv_cmd is executed on the same kworker CPU as this vhost
736 * thread to gain positive L2 cache locality effects..
737 */
738 INIT_WORK(&tv_cmd->work, tcm_vhost_submission_work);
739 queue_work(tcm_vhost_workqueue, &tv_cmd->work);
740 }
741
742 mutex_unlock(&vq->mutex);
743}
744
745static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
746{
101998f6 747 pr_debug("%s: The handling func for control queue.\n", __func__);
057cbf49
NB		 748}
749
750static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
751{
101998f6 752 pr_debug("%s: The handling func for event queue.\n", __func__);
057cbf49
NB		 753}
754
755static void vhost_scsi_handle_kick(struct vhost_work *work)
756{
757 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
758 poll.work);
759 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
760
761 vhost_scsi_handle_vq(vs);
762}
763
764/*
765 * Called from vhost_scsi_ioctl() context to walk the list of available
766 * tcm_vhost_tpg with an active struct tcm_vhost_nexus
767 */
768static int vhost_scsi_set_endpoint(
769 struct vhost_scsi *vs,
770 struct vhost_scsi_target *t)
771{
772 struct tcm_vhost_tport *tv_tport;
773 struct tcm_vhost_tpg *tv_tpg;
67e18cf9
AH		 774 bool match = false;
775 int index, ret;
057cbf49
NB		 776
777 mutex_lock(&vs->dev.mutex);
778 /* Verify that ring has been setup correctly. */
779 for (index = 0; index < vs->dev.nvqs; ++index) {
780 /* Verify that ring has been setup correctly. */
781 if (!vhost_vq_access_ok(&vs->vqs[index])) {
782 mutex_unlock(&vs->dev.mutex);
783 return -EFAULT;
784 }
785 }
057cbf49
NB		 786
787 mutex_lock(&tcm_vhost_mutex);
788 list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) {
789 mutex_lock(&tv_tpg->tv_tpg_mutex);
790 if (!tv_tpg->tpg_nexus) {
791 mutex_unlock(&tv_tpg->tv_tpg_mutex);
792 continue;
793 }
101998f6 794 if (tv_tpg->tv_tpg_vhost_count != 0) {
057cbf49
NB		 795 mutex_unlock(&tv_tpg->tv_tpg_mutex);
796 continue;
797 }
798 tv_tport = tv_tpg->tport;
799
67e18cf9
AH		 800 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
801 if (vs->vs_tpg[tv_tpg->tport_tpgt]) {
101998f6 802 mutex_unlock(&tv_tpg->tv_tpg_mutex);
67e18cf9
AH		 803 mutex_unlock(&tcm_vhost_mutex);
804 mutex_unlock(&vs->dev.mutex);
101998f6
NB		 805 return -EEXIST;
806 }
67e18cf9
AH		 807 tv_tpg->tv_tpg_vhost_count++;
808 vs->vs_tpg[tv_tpg->tport_tpgt] = tv_tpg;
057cbf49 809 smp_mb__after_atomic_inc();
67e18cf9 810 match = true;
057cbf49
NB		 811 }
812 mutex_unlock(&tv_tpg->tv_tpg_mutex);
813 }
814 mutex_unlock(&tcm_vhost_mutex);
67e18cf9
AH		 815
816 if (match) {
817 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
818 sizeof(vs->vs_vhost_wwpn));
819 vs->vs_endpoint = true;
820 ret = 0;
821 } else {
822 ret = -EEXIST;
823 }
824
825 mutex_unlock(&vs->dev.mutex);
826 return ret;
057cbf49
NB		 827}
828
829static int vhost_scsi_clear_endpoint(
830 struct vhost_scsi *vs,
831 struct vhost_scsi_target *t)
832{
833 struct tcm_vhost_tport *tv_tport;
834 struct tcm_vhost_tpg *tv_tpg;
67e18cf9
AH		 835 int index, ret, i;
836 u8 target;
057cbf49
NB		 837
838 mutex_lock(&vs->dev.mutex);
839 /* Verify that ring has been setup correctly. */
840 for (index = 0; index < vs->dev.nvqs; ++index) {
841 if (!vhost_vq_access_ok(&vs->vqs[index])) {
101998f6
NB		 842 ret = -EFAULT;
843 goto err;
057cbf49
NB		 844 }
845 }
67e18cf9
AH		 846 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
847 target = i;
057cbf49 848
67e18cf9
AH		 849 tv_tpg = vs->vs_tpg[target];
850 if (!tv_tpg)
851 continue;
852
853 tv_tport = tv_tpg->tport;
854 if (!tv_tport) {
855 ret = -ENODEV;
856 goto err;
857 }
858
859 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
860 pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu"
861 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
862 tv_tport->tport_name, tv_tpg->tport_tpgt,
863 t->vhost_wwpn, t->vhost_tpgt);
864 ret = -EINVAL;
865 goto err;
866 }
867 tv_tpg->tv_tpg_vhost_count--;
868 vs->vs_tpg[target] = NULL;
869 vs->vs_endpoint = false;
057cbf49 870 }
057cbf49 871 mutex_unlock(&vs->dev.mutex);
057cbf49 872 return 0;
101998f6
NB		 873
874err:
875 mutex_unlock(&vs->dev.mutex);
876 return ret;
057cbf49
NB		 877}
878
879static int vhost_scsi_open(struct inode *inode, struct file *f)
880{
881 struct vhost_scsi *s;
882 int r;
883
884 s = kzalloc(sizeof(*s), GFP_KERNEL);
885 if (!s)
886 return -ENOMEM;
887
888 vhost_work_init(&s->vs_completion_work, vhost_scsi_complete_cmd_work);
057cbf49 889
101998f6
NB		 890 s->vqs[VHOST_SCSI_VQ_CTL].handle_kick = vhost_scsi_ctl_handle_kick;
891 s->vqs[VHOST_SCSI_VQ_EVT].handle_kick = vhost_scsi_evt_handle_kick;
892 s->vqs[VHOST_SCSI_VQ_IO].handle_kick = vhost_scsi_handle_kick;
057cbf49
NB		 893 r = vhost_dev_init(&s->dev, s->vqs, 3);
894 if (r < 0) {
895 kfree(s);
896 return r;
897 }
898
899 f->private_data = s;
900 return 0;
901}
902
903static int vhost_scsi_release(struct inode *inode, struct file *f)
904{
905 struct vhost_scsi *s = f->private_data;
67e18cf9 906 struct vhost_scsi_target t;
057cbf49 907
67e18cf9
AH		 908 mutex_lock(&s->dev.mutex);
909 memcpy(t.vhost_wwpn, s->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
910 mutex_unlock(&s->dev.mutex);
911 vhost_scsi_clear_endpoint(s, &t);
b211616d 912 vhost_dev_stop(&s->dev);
057cbf49
NB		 913 vhost_dev_cleanup(&s->dev, false);
914 kfree(s);
915 return 0;
916}
917
101998f6
NB		 918static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
919{
920 vhost_poll_flush(&vs->dev.vqs[index].poll);
921}
922
923static void vhost_scsi_flush(struct vhost_scsi *vs)
924{
925 vhost_scsi_flush_vq(vs, VHOST_SCSI_VQ_CTL);
926 vhost_scsi_flush_vq(vs, VHOST_SCSI_VQ_EVT);
927 vhost_scsi_flush_vq(vs, VHOST_SCSI_VQ_IO);
928}
929
057cbf49
NB		 930static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
931{
932 if (features & ~VHOST_FEATURES)
933 return -EOPNOTSUPP;
934
935 mutex_lock(&vs->dev.mutex);
936 if ((features & (1 << VHOST_F_LOG_ALL)) &&
937 !vhost_log_access_ok(&vs->dev)) {
938 mutex_unlock(&vs->dev.mutex);
939 return -EFAULT;
940 }
941 vs->dev.acked_features = features;
101998f6
NB		 942 smp_wmb();
943 vhost_scsi_flush(vs);
057cbf49
NB		 944 mutex_unlock(&vs->dev.mutex);
945 return 0;
946}
947
948static long vhost_scsi_ioctl(struct file *f, unsigned int ioctl,
949 unsigned long arg)
950{
951 struct vhost_scsi *vs = f->private_data;
952 struct vhost_scsi_target backend;
953 void __user *argp = (void __user *)arg;
954 u64 __user *featurep = argp;
955 u64 features;
101998f6 956 int r, abi_version = VHOST_SCSI_ABI_VERSION;
057cbf49
NB		 957
958 switch (ioctl) {
959 case VHOST_SCSI_SET_ENDPOINT:
960 if (copy_from_user(&backend, argp, sizeof backend))
961 return -EFAULT;
6de7145c
MT		 962 if (backend.reserved != 0)
963 return -EOPNOTSUPP;
057cbf49
NB		 964
965 return vhost_scsi_set_endpoint(vs, &backend);
966 case VHOST_SCSI_CLEAR_ENDPOINT:
967 if (copy_from_user(&backend, argp, sizeof backend))
968 return -EFAULT;
6de7145c
MT		 969 if (backend.reserved != 0)
970 return -EOPNOTSUPP;
057cbf49
NB		 971
972 return vhost_scsi_clear_endpoint(vs, &backend);
973 case VHOST_SCSI_GET_ABI_VERSION:
101998f6 974 if (copy_to_user(argp, &abi_version, sizeof abi_version))
057cbf49
NB		 975 return -EFAULT;
976 return 0;
977 case VHOST_GET_FEATURES:
978 features = VHOST_FEATURES;
979 if (copy_to_user(featurep, &features, sizeof features))
980 return -EFAULT;
981 return 0;
982 case VHOST_SET_FEATURES:
983 if (copy_from_user(&features, featurep, sizeof features))
984 return -EFAULT;
985 return vhost_scsi_set_features(vs, features);
986 default:
987 mutex_lock(&vs->dev.mutex);
935cdee7
MT		 988 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
989 /* TODO: flush backend after dev ioctl. */
990 if (r == -ENOIOCTLCMD)
991 r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
057cbf49
NB		 992 mutex_unlock(&vs->dev.mutex);
993 return r;
994 }
995}
996
101998f6
NB		 997#ifdef CONFIG_COMPAT
998static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
999 unsigned long arg)
1000{
1001 return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
1002}
1003#endif
1004
057cbf49
NB		 1005static const struct file_operations vhost_scsi_fops = {
1006 .owner = THIS_MODULE,
1007 .release = vhost_scsi_release,
1008 .unlocked_ioctl = vhost_scsi_ioctl,
101998f6
NB		 1009#ifdef CONFIG_COMPAT
1010 .compat_ioctl = vhost_scsi_compat_ioctl,
1011#endif
057cbf49
NB		 1012 .open = vhost_scsi_open,
1013 .llseek = noop_llseek,
1014};
1015
1016static struct miscdevice vhost_scsi_misc = {
1017 MISC_DYNAMIC_MINOR,
1018 "vhost-scsi",
1019 &vhost_scsi_fops,
1020};
1021
1022static int __init vhost_scsi_register(void)
1023{
1024 return misc_register(&vhost_scsi_misc);
1025}
1026
1027static int vhost_scsi_deregister(void)
1028{
1029 return misc_deregister(&vhost_scsi_misc);
1030}
1031
1032static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport)
1033{
1034 switch (tport->tport_proto_id) {
1035 case SCSI_PROTOCOL_SAS:
1036 return "SAS";
1037 case SCSI_PROTOCOL_FCP:
1038 return "FCP";
1039 case SCSI_PROTOCOL_ISCSI:
1040 return "iSCSI";
1041 default:
1042 break;
1043 }
1044
1045 return "Unknown";
1046}
1047
101998f6 1048static int tcm_vhost_port_link(struct se_portal_group *se_tpg,
057cbf49
NB		 1049 struct se_lun *lun)
1050{
1051 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1052 struct tcm_vhost_tpg, se_tpg);
1053
101998f6
NB		 1054 mutex_lock(&tv_tpg->tv_tpg_mutex);
1055 tv_tpg->tv_tpg_port_count++;
1056 mutex_unlock(&tv_tpg->tv_tpg_mutex);
057cbf49
NB		 1057
1058 return 0;
1059}
1060
101998f6 1061static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg,
057cbf49
NB		 1062 struct se_lun *se_lun)
1063{
1064 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1065 struct tcm_vhost_tpg, se_tpg);
1066
101998f6
NB		 1067 mutex_lock(&tv_tpg->tv_tpg_mutex);
1068 tv_tpg->tv_tpg_port_count--;
1069 mutex_unlock(&tv_tpg->tv_tpg_mutex);
057cbf49
NB		 1070}
1071
1072static struct se_node_acl *tcm_vhost_make_nodeacl(
1073 struct se_portal_group *se_tpg,
1074 struct config_group *group,
1075 const char *name)
1076{
1077 struct se_node_acl *se_nacl, *se_nacl_new;
1078 struct tcm_vhost_nacl *nacl;
1079 u64 wwpn = 0;
1080 u32 nexus_depth;
1081
1082 /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1083 return ERR_PTR(-EINVAL); */
1084 se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg);
1085 if (!se_nacl_new)
1086 return ERR_PTR(-ENOMEM);
1087
1088 nexus_depth = 1;
1089 /*
1090 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1091 * when converting a NodeACL from demo mode -> explict
1092 */
1093 se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1094 name, nexus_depth);
1095 if (IS_ERR(se_nacl)) {
1096 tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new);
1097 return se_nacl;
1098 }
1099 /*
1100 * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN
1101 */
1102 nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl);
1103 nacl->iport_wwpn = wwpn;
1104
1105 return se_nacl;
1106}
1107
1108static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl)
1109{
1110 struct tcm_vhost_nacl *nacl = container_of(se_acl,
1111 struct tcm_vhost_nacl, se_node_acl);
1112 core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1113 kfree(nacl);
1114}
1115
101998f6 1116static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tv_tpg,
057cbf49
NB		 1117 const char *name)
1118{
1119 struct se_portal_group *se_tpg;
1120 struct tcm_vhost_nexus *tv_nexus;
1121
1122 mutex_lock(&tv_tpg->tv_tpg_mutex);
1123 if (tv_tpg->tpg_nexus) {
1124 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1125 pr_debug("tv_tpg->tpg_nexus already exists\n");
1126 return -EEXIST;
1127 }
1128 se_tpg = &tv_tpg->se_tpg;
1129
1130 tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL);
1131 if (!tv_nexus) {
1132 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1133 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1134 return -ENOMEM;
1135 }
1136 /*
1137 * Initialize the struct se_session pointer
1138 */
1139 tv_nexus->tvn_se_sess = transport_init_session();
1140 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1141 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1142 kfree(tv_nexus);
1143 return -ENOMEM;
1144 }
1145 /*
1146 * Since we are running in 'demo mode' this call with generate a
1147 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1148 * the SCSI Initiator port name of the passed configfs group 'name'.
1149 */
1150 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1151 se_tpg, (unsigned char *)name);
1152 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1153 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1154 pr_debug("core_tpg_check_initiator_node_acl() failed"
1155 " for %s\n", name);
1156 transport_free_session(tv_nexus->tvn_se_sess);
1157 kfree(tv_nexus);
1158 return -ENOMEM;
1159 }
1160 /*
101998f6 1161 * Now register the TCM vhost virtual I_T Nexus as active with the
057cbf49
NB		 1162 * call to __transport_register_session()
1163 */
1164 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1165 tv_nexus->tvn_se_sess, tv_nexus);
1166 tv_tpg->tpg_nexus = tv_nexus;
1167
1168 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1169 return 0;
1170}
1171
101998f6 1172static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg *tpg)
057cbf49
NB		 1173{
1174 struct se_session *se_sess;
1175 struct tcm_vhost_nexus *tv_nexus;
1176
1177 mutex_lock(&tpg->tv_tpg_mutex);
1178 tv_nexus = tpg->tpg_nexus;
1179 if (!tv_nexus) {
1180 mutex_unlock(&tpg->tv_tpg_mutex);
1181 return -ENODEV;
1182 }
1183
1184 se_sess = tv_nexus->tvn_se_sess;
1185 if (!se_sess) {
1186 mutex_unlock(&tpg->tv_tpg_mutex);
1187 return -ENODEV;
1188 }
1189
101998f6 1190 if (tpg->tv_tpg_port_count != 0) {
057cbf49 1191 mutex_unlock(&tpg->tv_tpg_mutex);
101998f6 1192 pr_err("Unable to remove TCM_vhost I_T Nexus with"
057cbf49 1193 " active TPG port count: %d\n",
101998f6
NB		 1194 tpg->tv_tpg_port_count);
1195 return -EBUSY;
057cbf49
NB		 1196 }
1197
101998f6 1198 if (tpg->tv_tpg_vhost_count != 0) {
057cbf49 1199 mutex_unlock(&tpg->tv_tpg_mutex);
101998f6 1200 pr_err("Unable to remove TCM_vhost I_T Nexus with"
057cbf49 1201 " active TPG vhost count: %d\n",
101998f6
NB		 1202 tpg->tv_tpg_vhost_count);
1203 return -EBUSY;
057cbf49
NB		 1204 }
1205
101998f6 1206 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
057cbf49
NB		 1207 " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport),
1208 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1209 /*
101998f6 1210 * Release the SCSI I_T Nexus to the emulated vhost Target Port
057cbf49
NB		 1211 */
1212 transport_deregister_session(tv_nexus->tvn_se_sess);
1213 tpg->tpg_nexus = NULL;
1214 mutex_unlock(&tpg->tv_tpg_mutex);
1215
1216 kfree(tv_nexus);
1217 return 0;
1218}
1219
101998f6 1220static ssize_t tcm_vhost_tpg_show_nexus(struct se_portal_group *se_tpg,
057cbf49
NB		 1221 char *page)
1222{
1223 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1224 struct tcm_vhost_tpg, se_tpg);
1225 struct tcm_vhost_nexus *tv_nexus;
1226 ssize_t ret;
1227
1228 mutex_lock(&tv_tpg->tv_tpg_mutex);
1229 tv_nexus = tv_tpg->tpg_nexus;
1230 if (!tv_nexus) {
1231 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1232 return -ENODEV;
1233 }
1234 ret = snprintf(page, PAGE_SIZE, "%s\n",
1235 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1236 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1237
1238 return ret;
1239}
1240
101998f6 1241static ssize_t tcm_vhost_tpg_store_nexus(struct se_portal_group *se_tpg,
057cbf49
NB		 1242 const char *page,
1243 size_t count)
1244{
1245 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1246 struct tcm_vhost_tpg, se_tpg);
1247 struct tcm_vhost_tport *tport_wwn = tv_tpg->tport;
1248 unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr;
1249 int ret;
1250 /*
1251 * Shutdown the active I_T nexus if 'NULL' is passed..
1252 */
1253 if (!strncmp(page, "NULL", 4)) {
1254 ret = tcm_vhost_drop_nexus(tv_tpg);
1255 return (!ret) ? count : ret;
1256 }
1257 /*
1258 * Otherwise make sure the passed virtual Initiator port WWN matches
1259 * the fabric protocol_id set in tcm_vhost_make_tport(), and call
1260 * tcm_vhost_make_nexus().
1261 */
1262 if (strlen(page) >= TCM_VHOST_NAMELEN) {
1263 pr_err("Emulated NAA Sas Address: %s, exceeds"
1264 " max: %d\n", page, TCM_VHOST_NAMELEN);
1265 return -EINVAL;
1266 }
1267 snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page);
1268
1269 ptr = strstr(i_port, "naa.");
1270 if (ptr) {
1271 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1272 pr_err("Passed SAS Initiator Port %s does not"
1273 " match target port protoid: %s\n", i_port,
1274 tcm_vhost_dump_proto_id(tport_wwn));
1275 return -EINVAL;
1276 }
1277 port_ptr = &i_port[0];
1278 goto check_newline;
1279 }
1280 ptr = strstr(i_port, "fc.");
1281 if (ptr) {
1282 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1283 pr_err("Passed FCP Initiator Port %s does not"
1284 " match target port protoid: %s\n", i_port,
1285 tcm_vhost_dump_proto_id(tport_wwn));
1286 return -EINVAL;
1287 }
1288 port_ptr = &i_port[3]; /* Skip over "fc." */
1289 goto check_newline;
1290 }
1291 ptr = strstr(i_port, "iqn.");
1292 if (ptr) {
1293 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1294 pr_err("Passed iSCSI Initiator Port %s does not"
1295 " match target port protoid: %s\n", i_port,
1296 tcm_vhost_dump_proto_id(tport_wwn));
1297 return -EINVAL;
1298 }
1299 port_ptr = &i_port[0];
1300 goto check_newline;
1301 }
1302 pr_err("Unable to locate prefix for emulated Initiator Port:"
1303 " %s\n", i_port);
1304 return -EINVAL;
1305 /*
1306 * Clear any trailing newline for the NAA WWN
1307 */
1308check_newline:
1309 if (i_port[strlen(i_port)-1] == '\n')
1310 i_port[strlen(i_port)-1] = '\0';
1311
1312 ret = tcm_vhost_make_nexus(tv_tpg, port_ptr);
1313 if (ret < 0)
1314 return ret;
1315
1316 return count;
1317}
1318
1319TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR);
1320
1321static struct configfs_attribute *tcm_vhost_tpg_attrs[] = {
1322 &tcm_vhost_tpg_nexus.attr,
1323 NULL,
1324};
1325
101998f6 1326static struct se_portal_group *tcm_vhost_make_tpg(struct se_wwn *wwn,
057cbf49
NB		 1327 struct config_group *group,
1328 const char *name)
1329{
1330 struct tcm_vhost_tport *tport = container_of(wwn,
1331 struct tcm_vhost_tport, tport_wwn);
1332
1333 struct tcm_vhost_tpg *tpg;
1334 unsigned long tpgt;
1335 int ret;
1336
1337 if (strstr(name, "tpgt_") != name)
1338 return ERR_PTR(-EINVAL);
1339 if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
1340 return ERR_PTR(-EINVAL);
1341
1342 tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL);
1343 if (!tpg) {
1344 pr_err("Unable to allocate struct tcm_vhost_tpg");
1345 return ERR_PTR(-ENOMEM);
1346 }
1347 mutex_init(&tpg->tv_tpg_mutex);
1348 INIT_LIST_HEAD(&tpg->tv_tpg_list);
1349 tpg->tport = tport;
1350 tpg->tport_tpgt = tpgt;
1351
1352 ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn,
1353 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
1354 if (ret < 0) {
1355 kfree(tpg);
1356 return NULL;
1357 }
1358 mutex_lock(&tcm_vhost_mutex);
1359 list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list);
1360 mutex_unlock(&tcm_vhost_mutex);
1361
1362 return &tpg->se_tpg;
1363}
1364
1365static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg)
1366{
1367 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
1368 struct tcm_vhost_tpg, se_tpg);
1369
1370 mutex_lock(&tcm_vhost_mutex);
1371 list_del(&tpg->tv_tpg_list);
1372 mutex_unlock(&tcm_vhost_mutex);
1373 /*
101998f6 1374 * Release the virtual I_T Nexus for this vhost TPG
057cbf49
NB		 1375 */
1376 tcm_vhost_drop_nexus(tpg);
1377 /*
1378 * Deregister the se_tpg from TCM..
1379 */
1380 core_tpg_deregister(se_tpg);
1381 kfree(tpg);
1382}
1383
101998f6 1384static struct se_wwn *tcm_vhost_make_tport(struct target_fabric_configfs *tf,
057cbf49
NB		 1385 struct config_group *group,
1386 const char *name)
1387{
1388 struct tcm_vhost_tport *tport;
1389 char *ptr;
1390 u64 wwpn = 0;
1391 int off = 0;
1392
1393 /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1394 return ERR_PTR(-EINVAL); */
1395
1396 tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL);
1397 if (!tport) {
1398 pr_err("Unable to allocate struct tcm_vhost_tport");
1399 return ERR_PTR(-ENOMEM);
1400 }
1401 tport->tport_wwpn = wwpn;
1402 /*
1403 * Determine the emulated Protocol Identifier and Target Port Name
1404 * based on the incoming configfs directory name.
1405 */
1406 ptr = strstr(name, "naa.");
1407 if (ptr) {
1408 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
1409 goto check_len;
1410 }
1411 ptr = strstr(name, "fc.");
1412 if (ptr) {
1413 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
1414 off = 3; /* Skip over "fc." */
1415 goto check_len;
1416 }
1417 ptr = strstr(name, "iqn.");
1418 if (ptr) {
1419 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
1420 goto check_len;
1421 }
1422
1423 pr_err("Unable to locate prefix for emulated Target Port:"
1424 " %s\n", name);
1425 kfree(tport);
1426 return ERR_PTR(-EINVAL);
1427
1428check_len:
1429 if (strlen(name) >= TCM_VHOST_NAMELEN) {
1430 pr_err("Emulated %s Address: %s, exceeds"
1431 " max: %d\n", name, tcm_vhost_dump_proto_id(tport),
1432 TCM_VHOST_NAMELEN);
1433 kfree(tport);
1434 return ERR_PTR(-EINVAL);
1435 }
1436 snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]);
1437
1438 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
1439 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name);
1440
1441 return &tport->tport_wwn;
1442}
1443
1444static void tcm_vhost_drop_tport(struct se_wwn *wwn)
1445{
1446 struct tcm_vhost_tport *tport = container_of(wwn,
1447 struct tcm_vhost_tport, tport_wwn);
1448
1449 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
1450 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport),
1451 tport->tport_name);
1452
1453 kfree(tport);
1454}
1455
1456static ssize_t tcm_vhost_wwn_show_attr_version(
1457 struct target_fabric_configfs *tf,
1458 char *page)
1459{
1460 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
1461 "on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
1462 utsname()->machine);
1463}
1464
1465TF_WWN_ATTR_RO(tcm_vhost, version);
1466
1467static struct configfs_attribute *tcm_vhost_wwn_attrs[] = {
1468 &tcm_vhost_wwn_version.attr,
1469 NULL,
1470};
1471
1472static struct target_core_fabric_ops tcm_vhost_ops = {
1473 .get_fabric_name = tcm_vhost_get_fabric_name,
1474 .get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident,
1475 .tpg_get_wwn = tcm_vhost_get_fabric_wwn,
1476 .tpg_get_tag = tcm_vhost_get_tag,
1477 .tpg_get_default_depth = tcm_vhost_get_default_depth,
1478 .tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id,
1479 .tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len,
1480 .tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id,
1481 .tpg_check_demo_mode = tcm_vhost_check_true,
1482 .tpg_check_demo_mode_cache = tcm_vhost_check_true,
1483 .tpg_check_demo_mode_write_protect = tcm_vhost_check_false,
1484 .tpg_check_prod_mode_write_protect = tcm_vhost_check_false,
1485 .tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl,
1486 .tpg_release_fabric_acl = tcm_vhost_release_fabric_acl,
1487 .tpg_get_inst_index = tcm_vhost_tpg_get_inst_index,
1488 .release_cmd = tcm_vhost_release_cmd,
1489 .shutdown_session = tcm_vhost_shutdown_session,
1490 .close_session = tcm_vhost_close_session,
1491 .sess_get_index = tcm_vhost_sess_get_index,
1492 .sess_get_initiator_sid = NULL,
1493 .write_pending = tcm_vhost_write_pending,
1494 .write_pending_status = tcm_vhost_write_pending_status,
1495 .set_default_node_attributes = tcm_vhost_set_default_node_attrs,
1496 .get_task_tag = tcm_vhost_get_task_tag,
1497 .get_cmd_state = tcm_vhost_get_cmd_state,
1498 .queue_data_in = tcm_vhost_queue_data_in,
1499 .queue_status = tcm_vhost_queue_status,
1500 .queue_tm_rsp = tcm_vhost_queue_tm_rsp,
057cbf49
NB		 1501 /*
1502 * Setup callers for generic logic in target_core_fabric_configfs.c
1503 */
1504 .fabric_make_wwn = tcm_vhost_make_tport,
1505 .fabric_drop_wwn = tcm_vhost_drop_tport,
1506 .fabric_make_tpg = tcm_vhost_make_tpg,
1507 .fabric_drop_tpg = tcm_vhost_drop_tpg,
1508 .fabric_post_link = tcm_vhost_port_link,
1509 .fabric_pre_unlink = tcm_vhost_port_unlink,
1510 .fabric_make_np = NULL,
1511 .fabric_drop_np = NULL,
1512 .fabric_make_nodeacl = tcm_vhost_make_nodeacl,
1513 .fabric_drop_nodeacl = tcm_vhost_drop_nodeacl,
1514};
1515
1516static int tcm_vhost_register_configfs(void)
1517{
1518 struct target_fabric_configfs *fabric;
1519 int ret;
1520
1521 pr_debug("TCM_VHOST fabric module %s on %s/%s"
1522 " on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
1523 utsname()->machine);
1524 /*
1525 * Register the top level struct config_item_type with TCM core
1526 */
1527 fabric = target_fabric_configfs_init(THIS_MODULE, "vhost");
1528 if (IS_ERR(fabric)) {
1529 pr_err("target_fabric_configfs_init() failed\n");
1530 return PTR_ERR(fabric);
1531 }
1532 /*
1533 * Setup fabric->tf_ops from our local tcm_vhost_ops
1534 */
1535 fabric->tf_ops = tcm_vhost_ops;
1536 /*
1537 * Setup default attribute lists for various fabric->tf_cit_tmpl
1538 */
1539 TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs;
1540 TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs;
1541 TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1542 TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1543 TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1544 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
1545 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
1546 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
1547 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
1548 /*
1549 * Register the fabric for use within TCM
1550 */
1551 ret = target_fabric_configfs_register(fabric);
1552 if (ret < 0) {
1553 pr_err("target_fabric_configfs_register() failed"
1554 " for TCM_VHOST\n");
1555 return ret;
1556 }
1557 /*
1558 * Setup our local pointer to *fabric
1559 */
1560 tcm_vhost_fabric_configfs = fabric;
1561 pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n");
1562 return 0;
1563};
1564
1565static void tcm_vhost_deregister_configfs(void)
1566{
1567 if (!tcm_vhost_fabric_configfs)
1568 return;
1569
1570 target_fabric_configfs_deregister(tcm_vhost_fabric_configfs);
1571 tcm_vhost_fabric_configfs = NULL;
1572 pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n");
1573};
1574
1575static int __init tcm_vhost_init(void)
1576{
1577 int ret = -ENOMEM;
101998f6
NB		 1578 /*
1579 * Use our own dedicated workqueue for submitting I/O into
1580 * target core to avoid contention within system_wq.
1581 */
057cbf49
NB		 1582 tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0);
1583 if (!tcm_vhost_workqueue)
1584 goto out;
1585
1586 ret = vhost_scsi_register();
1587 if (ret < 0)
1588 goto out_destroy_workqueue;
1589
1590 ret = tcm_vhost_register_configfs();
1591 if (ret < 0)
1592 goto out_vhost_scsi_deregister;
1593
1594 return 0;
1595
1596out_vhost_scsi_deregister:
1597 vhost_scsi_deregister();
1598out_destroy_workqueue:
1599 destroy_workqueue(tcm_vhost_workqueue);
1600out:
1601 return ret;
1602};
1603
1604static void tcm_vhost_exit(void)
1605{
1606 tcm_vhost_deregister_configfs();
1607 vhost_scsi_deregister();
1608 destroy_workqueue(tcm_vhost_workqueue);
1609};
1610
1611MODULE_DESCRIPTION("TCM_VHOST series fabric driver");
1612MODULE_LICENSE("GPL");
1613module_init(tcm_vhost_init);
1614module_exit(tcm_vhost_exit);
Linux kernel - Deliverables
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