1 /*******************************************************************************
2 * Vhost kernel TCM fabric driver for virtio SCSI initiators
4 * (C) Copyright 2010-2012 RisingTide Systems LLC.
5 * (C) Copyright 2010-2012 IBM Corp.
7 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
9 * Authors: Nicholas A. Bellinger <nab@risingtidesystems.com>
10 * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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.
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.
22 ****************************************************************************/
24 #include <linux/module.h>
25 #include <linux/moduleparam.h>
26 #include <generated/utsrelease.h>
27 #include <linux/utsname.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <linux/kthread.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/configfs.h>
34 #include <linux/ctype.h>
35 #include <linux/compat.h>
36 #include <linux/eventfd.h>
37 #include <linux/vhost.h>
39 #include <linux/miscdevice.h>
40 #include <asm/unaligned.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_tcq.h>
43 #include <target/target_core_base.h>
44 #include <target/target_core_fabric.h>
45 #include <target/target_core_fabric_configfs.h>
46 #include <target/target_core_configfs.h>
47 #include <target/configfs_macros.h>
48 #include <linux/vhost.h>
49 #include <linux/virtio_net.h> /* TODO vhost.h currently depends on this */
50 #include <linux/virtio_scsi.h>
54 #include "tcm_vhost.h"
57 VHOST_SCSI_VQ_CTL = 0,
58 VHOST_SCSI_VQ_EVT = 1,
63 struct tcm_vhost_tpg *vs_tpg; /* Protected by vhost_scsi->dev.mutex */
65 struct vhost_virtqueue vqs[3];
67 struct vhost_work vs_completion_work; /* cmd completion work item */
68 struct list_head vs_completion_list; /* cmd completion queue */
69 spinlock_t vs_completion_lock; /* protects s_completion_list */
72 /* Local pointer to allocated TCM configfs fabric module */
73 static struct target_fabric_configfs *tcm_vhost_fabric_configfs;
75 static struct workqueue_struct *tcm_vhost_workqueue;
77 /* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */
78 static DEFINE_MUTEX(tcm_vhost_mutex);
79 static LIST_HEAD(tcm_vhost_list);
81 static int tcm_vhost_check_true(struct se_portal_group *se_tpg)
86 static int tcm_vhost_check_false(struct se_portal_group *se_tpg)
91 static char *tcm_vhost_get_fabric_name(void)
96 static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg)
98 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
99 struct tcm_vhost_tpg, se_tpg);
100 struct tcm_vhost_tport *tport = tpg->tport;
102 switch (tport->tport_proto_id) {
103 case SCSI_PROTOCOL_SAS:
104 return sas_get_fabric_proto_ident(se_tpg);
105 case SCSI_PROTOCOL_FCP:
106 return fc_get_fabric_proto_ident(se_tpg);
107 case SCSI_PROTOCOL_ISCSI:
108 return iscsi_get_fabric_proto_ident(se_tpg);
110 pr_err("Unknown tport_proto_id: 0x%02x, using"
111 " SAS emulation\n", tport->tport_proto_id);
115 return sas_get_fabric_proto_ident(se_tpg);
118 static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg)
120 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
121 struct tcm_vhost_tpg, se_tpg);
122 struct tcm_vhost_tport *tport = tpg->tport;
124 return &tport->tport_name[0];
127 static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg)
129 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
130 struct tcm_vhost_tpg, se_tpg);
131 return tpg->tport_tpgt;
134 static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg)
139 static u32 tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg,
140 struct se_node_acl *se_nacl,
141 struct t10_pr_registration *pr_reg,
145 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
146 struct tcm_vhost_tpg, se_tpg);
147 struct tcm_vhost_tport *tport = tpg->tport;
149 switch (tport->tport_proto_id) {
150 case SCSI_PROTOCOL_SAS:
151 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
153 case SCSI_PROTOCOL_FCP:
154 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
156 case SCSI_PROTOCOL_ISCSI:
157 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
160 pr_err("Unknown tport_proto_id: 0x%02x, using"
161 " SAS emulation\n", tport->tport_proto_id);
165 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
169 static u32 tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg,
170 struct se_node_acl *se_nacl,
171 struct t10_pr_registration *pr_reg,
174 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
175 struct tcm_vhost_tpg, se_tpg);
176 struct tcm_vhost_tport *tport = tpg->tport;
178 switch (tport->tport_proto_id) {
179 case SCSI_PROTOCOL_SAS:
180 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
182 case SCSI_PROTOCOL_FCP:
183 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
185 case SCSI_PROTOCOL_ISCSI:
186 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
189 pr_err("Unknown tport_proto_id: 0x%02x, using"
190 " SAS emulation\n", tport->tport_proto_id);
194 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
198 static char *tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
201 char **port_nexus_ptr)
203 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
204 struct tcm_vhost_tpg, se_tpg);
205 struct tcm_vhost_tport *tport = tpg->tport;
207 switch (tport->tport_proto_id) {
208 case SCSI_PROTOCOL_SAS:
209 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
211 case SCSI_PROTOCOL_FCP:
212 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
214 case SCSI_PROTOCOL_ISCSI:
215 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
218 pr_err("Unknown tport_proto_id: 0x%02x, using"
219 " SAS emulation\n", tport->tport_proto_id);
223 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
227 static struct se_node_acl *tcm_vhost_alloc_fabric_acl(
228 struct se_portal_group *se_tpg)
230 struct tcm_vhost_nacl *nacl;
232 nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL);
234 pr_err("Unable to alocate struct tcm_vhost_nacl\n");
238 return &nacl->se_node_acl;
241 static void tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg,
242 struct se_node_acl *se_nacl)
244 struct tcm_vhost_nacl *nacl = container_of(se_nacl,
245 struct tcm_vhost_nacl, se_node_acl);
249 static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg)
254 static void tcm_vhost_release_cmd(struct se_cmd *se_cmd)
259 static int tcm_vhost_shutdown_session(struct se_session *se_sess)
264 static void tcm_vhost_close_session(struct se_session *se_sess)
269 static u32 tcm_vhost_sess_get_index(struct se_session *se_sess)
274 static int tcm_vhost_write_pending(struct se_cmd *se_cmd)
276 /* Go ahead and process the write immediately */
277 target_execute_cmd(se_cmd);
281 static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd)
286 static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl)
291 static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd)
296 static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd)
301 static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *tv_cmd)
303 struct vhost_scsi *vs = tv_cmd->tvc_vhost;
305 spin_lock_bh(&vs->vs_completion_lock);
306 list_add_tail(&tv_cmd->tvc_completion_list, &vs->vs_completion_list);
307 spin_unlock_bh(&vs->vs_completion_lock);
309 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
312 static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd)
314 struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
315 struct tcm_vhost_cmd, tvc_se_cmd);
316 vhost_scsi_complete_cmd(tv_cmd);
320 static int tcm_vhost_queue_status(struct se_cmd *se_cmd)
322 struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
323 struct tcm_vhost_cmd, tvc_se_cmd);
324 vhost_scsi_complete_cmd(tv_cmd);
328 static int tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd)
333 static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd)
335 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
337 /* TODO locking against target/backend threads? */
338 transport_generic_free_cmd(se_cmd, 1);
340 if (tv_cmd->tvc_sgl_count) {
342 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
343 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
345 kfree(tv_cmd->tvc_sgl);
351 /* Dequeue a command from the completion list */
352 static struct tcm_vhost_cmd *vhost_scsi_get_cmd_from_completion(
353 struct vhost_scsi *vs)
355 struct tcm_vhost_cmd *tv_cmd = NULL;
357 spin_lock_bh(&vs->vs_completion_lock);
358 if (list_empty(&vs->vs_completion_list)) {
359 spin_unlock_bh(&vs->vs_completion_lock);
363 list_for_each_entry(tv_cmd, &vs->vs_completion_list,
364 tvc_completion_list) {
365 list_del(&tv_cmd->tvc_completion_list);
368 spin_unlock_bh(&vs->vs_completion_lock);
372 /* Fill in status and signal that we are done processing this command
374 * This is scheduled in the vhost work queue so we are called with the owner
375 * process mm and can access the vring.
377 static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
379 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
381 struct tcm_vhost_cmd *tv_cmd;
383 while ((tv_cmd = vhost_scsi_get_cmd_from_completion(vs))) {
384 struct virtio_scsi_cmd_resp v_rsp;
385 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
388 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
389 tv_cmd, se_cmd->residual_count, se_cmd->scsi_status);
391 memset(&v_rsp, 0, sizeof(v_rsp));
392 v_rsp.resid = se_cmd->residual_count;
393 /* TODO is status_qualifier field needed? */
394 v_rsp.status = se_cmd->scsi_status;
395 v_rsp.sense_len = se_cmd->scsi_sense_length;
396 memcpy(v_rsp.sense, tv_cmd->tvc_sense_buf,
398 ret = copy_to_user(tv_cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
399 if (likely(ret == 0))
400 vhost_add_used(&vs->vqs[2], tv_cmd->tvc_vq_desc, 0);
402 pr_err("Faulted on virtio_scsi_cmd_resp\n");
404 vhost_scsi_free_cmd(tv_cmd);
407 vhost_signal(&vs->dev, &vs->vqs[2]);
410 static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd(
411 struct tcm_vhost_tpg *tv_tpg,
412 struct virtio_scsi_cmd_req *v_req,
416 struct tcm_vhost_cmd *tv_cmd;
417 struct tcm_vhost_nexus *tv_nexus;
418 struct se_session *se_sess;
420 tv_nexus = tv_tpg->tpg_nexus;
422 pr_err("Unable to locate active struct tcm_vhost_nexus\n");
423 return ERR_PTR(-EIO);
425 se_sess = tv_nexus->tvn_se_sess;
427 tv_cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC);
429 pr_err("Unable to allocate struct tcm_vhost_cmd\n");
430 return ERR_PTR(-ENOMEM);
432 INIT_LIST_HEAD(&tv_cmd->tvc_completion_list);
433 tv_cmd->tvc_tag = v_req->tag;
434 tv_cmd->tvc_task_attr = v_req->task_attr;
435 tv_cmd->tvc_exp_data_len = exp_data_len;
436 tv_cmd->tvc_data_direction = data_direction;
437 tv_cmd->tvc_nexus = tv_nexus;
443 * Map a user memory range into a scatterlist
445 * Returns the number of scatterlist entries used or -errno on error.
447 static int vhost_scsi_map_to_sgl(struct scatterlist *sgl,
448 unsigned int sgl_count, void __user *ptr, size_t len, int write)
450 struct scatterlist *sg = sgl;
451 unsigned int npages = 0;
456 unsigned int offset = (uintptr_t)ptr & ~PAGE_MASK;
457 unsigned int nbytes = min_t(unsigned int,
458 PAGE_SIZE - offset, len);
460 if (npages == sgl_count) {
465 ret = get_user_pages_fast((unsigned long)ptr, 1, write, &page);
466 BUG_ON(ret == 0); /* we should either get our page or fail */
470 sg_set_page(sg, page, nbytes, offset);
479 /* Put pages that we hold */
480 for (sg = sgl; sg != &sgl[npages]; sg++)
481 put_page(sg_page(sg));
485 static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd,
486 struct iovec *iov, unsigned int niov, int write)
491 struct scatterlist *sg;
494 * Find out how long sglist needs to be
497 for (i = 0; i < niov; i++) {
498 sgl_count += (((uintptr_t)iov[i].iov_base + iov[i].iov_len +
499 PAGE_SIZE - 1) >> PAGE_SHIFT) -
500 ((uintptr_t)iov[i].iov_base >> PAGE_SHIFT);
502 /* TODO overflow checking */
504 sg = kmalloc(sizeof(tv_cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC);
507 pr_debug("%s sg %p sgl_count %u is_err %d\n", __func__,
509 sg_init_table(sg, sgl_count);
511 tv_cmd->tvc_sgl = sg;
512 tv_cmd->tvc_sgl_count = sgl_count;
514 pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count);
515 for (i = 0; i < niov; i++) {
516 ret = vhost_scsi_map_to_sgl(sg, sgl_count, iov[i].iov_base,
517 iov[i].iov_len, write);
519 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
520 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
521 kfree(tv_cmd->tvc_sgl);
522 tv_cmd->tvc_sgl = NULL;
523 tv_cmd->tvc_sgl_count = 0;
533 static void tcm_vhost_submission_work(struct work_struct *work)
535 struct tcm_vhost_cmd *tv_cmd =
536 container_of(work, struct tcm_vhost_cmd, work);
537 struct tcm_vhost_nexus *tv_nexus;
538 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
539 struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL;
540 int rc, sg_no_bidi = 0;
542 if (tv_cmd->tvc_sgl_count) {
543 sg_ptr = tv_cmd->tvc_sgl;
545 * For BIDI commands, pass in the extra READ buffer
546 * to transport_generic_map_mem_to_cmd() below..
548 /* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */
550 if (se_cmd->se_cmd_flags & SCF_BIDI) {
558 tv_nexus = tv_cmd->tvc_nexus;
560 rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
561 tv_cmd->tvc_cdb, &tv_cmd->tvc_sense_buf[0],
562 tv_cmd->tvc_lun, tv_cmd->tvc_exp_data_len,
563 tv_cmd->tvc_task_attr, tv_cmd->tvc_data_direction,
564 0, sg_ptr, tv_cmd->tvc_sgl_count,
565 sg_bidi_ptr, sg_no_bidi);
567 transport_send_check_condition_and_sense(se_cmd,
568 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
569 transport_generic_free_cmd(se_cmd, 0);
573 static void vhost_scsi_handle_vq(struct vhost_scsi *vs)
575 struct vhost_virtqueue *vq = &vs->vqs[2];
576 struct virtio_scsi_cmd_req v_req;
577 struct tcm_vhost_tpg *tv_tpg;
578 struct tcm_vhost_cmd *tv_cmd;
579 u32 exp_data_len, data_first, data_num, data_direction;
583 /* Must use ioctl VHOST_SCSI_SET_ENDPOINT */
585 if (unlikely(!tv_tpg)) {
586 pr_err("%s endpoint not set\n", __func__);
590 mutex_lock(&vq->mutex);
591 vhost_disable_notify(&vs->dev, vq);
594 head = vhost_get_vq_desc(&vs->dev, vq, vq->iov,
595 ARRAY_SIZE(vq->iov), &out, &in,
597 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
599 /* On error, stop handling until the next kick. */
600 if (unlikely(head < 0))
602 /* Nothing new? Wait for eventfd to tell us they refilled. */
603 if (head == vq->num) {
604 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
605 vhost_disable_notify(&vs->dev, vq);
611 /* FIXME: BIDI operation */
612 if (out == 1 && in == 1) {
613 data_direction = DMA_NONE;
616 } else if (out == 1 && in > 1) {
617 data_direction = DMA_FROM_DEVICE;
618 data_first = out + 1;
620 } else if (out > 1 && in == 1) {
621 data_direction = DMA_TO_DEVICE;
625 vq_err(vq, "Invalid buffer layout out: %u in: %u\n",
631 * Check for a sane resp buffer so we can report errors to
634 if (unlikely(vq->iov[out].iov_len !=
635 sizeof(struct virtio_scsi_cmd_resp))) {
636 vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
637 " bytes\n", vq->iov[out].iov_len);
641 if (unlikely(vq->iov[0].iov_len != sizeof(v_req))) {
642 vq_err(vq, "Expecting virtio_scsi_cmd_req, got %zu"
643 " bytes\n", vq->iov[0].iov_len);
646 pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p,"
647 " len: %zu\n", vq->iov[0].iov_base, sizeof(v_req));
648 ret = __copy_from_user(&v_req, vq->iov[0].iov_base,
651 vq_err(vq, "Faulted on virtio_scsi_cmd_req\n");
656 for (i = 0; i < data_num; i++)
657 exp_data_len += vq->iov[data_first + i].iov_len;
659 tv_cmd = vhost_scsi_allocate_cmd(tv_tpg, &v_req,
660 exp_data_len, data_direction);
661 if (IS_ERR(tv_cmd)) {
662 vq_err(vq, "vhost_scsi_allocate_cmd failed %ld\n",
666 pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
667 ": %d\n", tv_cmd, exp_data_len, data_direction);
669 tv_cmd->tvc_vhost = vs;
671 if (unlikely(vq->iov[out].iov_len !=
672 sizeof(struct virtio_scsi_cmd_resp))) {
673 vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
674 " bytes, out: %d, in: %d\n",
675 vq->iov[out].iov_len, out, in);
679 tv_cmd->tvc_resp = vq->iov[out].iov_base;
682 * Copy in the recieved CDB descriptor into tv_cmd->tvc_cdb
683 * that will be used by tcm_vhost_new_cmd_map() and down into
684 * target_setup_cmd_from_cdb()
686 memcpy(tv_cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE);
688 * Check that the recieved CDB size does not exceeded our
689 * hardcoded max for tcm_vhost
691 /* TODO what if cdb was too small for varlen cdb header? */
692 if (unlikely(scsi_command_size(tv_cmd->tvc_cdb) >
693 TCM_VHOST_MAX_CDB_SIZE)) {
694 vq_err(vq, "Received SCSI CDB with command_size: %d that"
695 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
696 scsi_command_size(tv_cmd->tvc_cdb),
697 TCM_VHOST_MAX_CDB_SIZE);
700 tv_cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
702 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
703 tv_cmd->tvc_cdb[0], tv_cmd->tvc_lun);
705 if (data_direction != DMA_NONE) {
706 ret = vhost_scsi_map_iov_to_sgl(tv_cmd,
707 &vq->iov[data_first], data_num,
708 data_direction == DMA_TO_DEVICE);
710 vq_err(vq, "Failed to map iov to sgl\n");
716 * Save the descriptor from vhost_get_vq_desc() to be used to
717 * complete the virtio-scsi request in TCM callback context via
718 * tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
720 tv_cmd->tvc_vq_desc = head;
722 * Dispatch tv_cmd descriptor for cmwq execution in process
723 * context provided by tcm_vhost_workqueue. This also ensures
724 * tv_cmd is executed on the same kworker CPU as this vhost
725 * thread to gain positive L2 cache locality effects..
727 INIT_WORK(&tv_cmd->work, tcm_vhost_submission_work);
728 queue_work(tcm_vhost_workqueue, &tv_cmd->work);
731 mutex_unlock(&vq->mutex);
734 static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
736 pr_debug("%s: The handling func for control queue.\n", __func__);
739 static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
741 pr_debug("%s: The handling func for event queue.\n", __func__);
744 static void vhost_scsi_handle_kick(struct vhost_work *work)
746 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
748 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
750 vhost_scsi_handle_vq(vs);
754 * Called from vhost_scsi_ioctl() context to walk the list of available
755 * tcm_vhost_tpg with an active struct tcm_vhost_nexus
757 static int vhost_scsi_set_endpoint(
758 struct vhost_scsi *vs,
759 struct vhost_scsi_target *t)
761 struct tcm_vhost_tport *tv_tport;
762 struct tcm_vhost_tpg *tv_tpg;
765 mutex_lock(&vs->dev.mutex);
766 /* Verify that ring has been setup correctly. */
767 for (index = 0; index < vs->dev.nvqs; ++index) {
768 /* Verify that ring has been setup correctly. */
769 if (!vhost_vq_access_ok(&vs->vqs[index])) {
770 mutex_unlock(&vs->dev.mutex);
774 mutex_unlock(&vs->dev.mutex);
776 mutex_lock(&tcm_vhost_mutex);
777 list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) {
778 mutex_lock(&tv_tpg->tv_tpg_mutex);
779 if (!tv_tpg->tpg_nexus) {
780 mutex_unlock(&tv_tpg->tv_tpg_mutex);
783 if (tv_tpg->tv_tpg_vhost_count != 0) {
784 mutex_unlock(&tv_tpg->tv_tpg_mutex);
787 tv_tport = tv_tpg->tport;
789 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn) &&
790 (tv_tpg->tport_tpgt == t->vhost_tpgt)) {
791 tv_tpg->tv_tpg_vhost_count++;
792 mutex_unlock(&tv_tpg->tv_tpg_mutex);
793 mutex_unlock(&tcm_vhost_mutex);
795 mutex_lock(&vs->dev.mutex);
797 mutex_unlock(&vs->dev.mutex);
798 mutex_lock(&tv_tpg->tv_tpg_mutex);
799 tv_tpg->tv_tpg_vhost_count--;
800 mutex_unlock(&tv_tpg->tv_tpg_mutex);
805 smp_mb__after_atomic_inc();
806 mutex_unlock(&vs->dev.mutex);
809 mutex_unlock(&tv_tpg->tv_tpg_mutex);
811 mutex_unlock(&tcm_vhost_mutex);
815 static int vhost_scsi_clear_endpoint(
816 struct vhost_scsi *vs,
817 struct vhost_scsi_target *t)
819 struct tcm_vhost_tport *tv_tport;
820 struct tcm_vhost_tpg *tv_tpg;
823 mutex_lock(&vs->dev.mutex);
824 /* Verify that ring has been setup correctly. */
825 for (index = 0; index < vs->dev.nvqs; ++index) {
826 if (!vhost_vq_access_ok(&vs->vqs[index])) {
837 tv_tport = tv_tpg->tport;
839 if (strcmp(tv_tport->tport_name, t->vhost_wwpn) ||
840 (tv_tpg->tport_tpgt != t->vhost_tpgt)) {
841 pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu"
842 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
843 tv_tport->tport_name, tv_tpg->tport_tpgt,
844 t->vhost_wwpn, t->vhost_tpgt);
848 tv_tpg->tv_tpg_vhost_count--;
850 mutex_unlock(&vs->dev.mutex);
855 mutex_unlock(&vs->dev.mutex);
859 static int vhost_scsi_open(struct inode *inode, struct file *f)
861 struct vhost_scsi *s;
864 s = kzalloc(sizeof(*s), GFP_KERNEL);
868 vhost_work_init(&s->vs_completion_work, vhost_scsi_complete_cmd_work);
869 INIT_LIST_HEAD(&s->vs_completion_list);
870 spin_lock_init(&s->vs_completion_lock);
872 s->vqs[VHOST_SCSI_VQ_CTL].handle_kick = vhost_scsi_ctl_handle_kick;
873 s->vqs[VHOST_SCSI_VQ_EVT].handle_kick = vhost_scsi_evt_handle_kick;
874 s->vqs[VHOST_SCSI_VQ_IO].handle_kick = vhost_scsi_handle_kick;
875 r = vhost_dev_init(&s->dev, s->vqs, 3);
885 static int vhost_scsi_release(struct inode *inode, struct file *f)
887 struct vhost_scsi *s = f->private_data;
889 if (s->vs_tpg && s->vs_tpg->tport) {
890 struct vhost_scsi_target backend;
892 memcpy(backend.vhost_wwpn, s->vs_tpg->tport->tport_name,
893 sizeof(backend.vhost_wwpn));
894 backend.vhost_tpgt = s->vs_tpg->tport_tpgt;
895 vhost_scsi_clear_endpoint(s, &backend);
898 vhost_dev_cleanup(&s->dev, false);
903 static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
905 vhost_poll_flush(&vs->dev.vqs[index].poll);
908 static void vhost_scsi_flush(struct vhost_scsi *vs)
910 vhost_scsi_flush_vq(vs, VHOST_SCSI_VQ_CTL);
911 vhost_scsi_flush_vq(vs, VHOST_SCSI_VQ_EVT);
912 vhost_scsi_flush_vq(vs, VHOST_SCSI_VQ_IO);
915 static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
917 if (features & ~VHOST_FEATURES)
920 mutex_lock(&vs->dev.mutex);
921 if ((features & (1 << VHOST_F_LOG_ALL)) &&
922 !vhost_log_access_ok(&vs->dev)) {
923 mutex_unlock(&vs->dev.mutex);
926 vs->dev.acked_features = features;
928 vhost_scsi_flush(vs);
929 mutex_unlock(&vs->dev.mutex);
933 static long vhost_scsi_ioctl(struct file *f, unsigned int ioctl,
936 struct vhost_scsi *vs = f->private_data;
937 struct vhost_scsi_target backend;
938 void __user *argp = (void __user *)arg;
939 u64 __user *featurep = argp;
941 int r, abi_version = VHOST_SCSI_ABI_VERSION;
944 case VHOST_SCSI_SET_ENDPOINT:
945 if (copy_from_user(&backend, argp, sizeof backend))
947 if (backend.reserved != 0)
950 return vhost_scsi_set_endpoint(vs, &backend);
951 case VHOST_SCSI_CLEAR_ENDPOINT:
952 if (copy_from_user(&backend, argp, sizeof backend))
954 if (backend.reserved != 0)
957 return vhost_scsi_clear_endpoint(vs, &backend);
958 case VHOST_SCSI_GET_ABI_VERSION:
959 if (copy_to_user(argp, &abi_version, sizeof abi_version))
962 case VHOST_GET_FEATURES:
963 features = VHOST_FEATURES;
964 if (copy_to_user(featurep, &features, sizeof features))
967 case VHOST_SET_FEATURES:
968 if (copy_from_user(&features, featurep, sizeof features))
970 return vhost_scsi_set_features(vs, features);
972 mutex_lock(&vs->dev.mutex);
973 r = vhost_dev_ioctl(&vs->dev, ioctl, arg);
974 mutex_unlock(&vs->dev.mutex);
980 static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
983 return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
987 static const struct file_operations vhost_scsi_fops = {
988 .owner = THIS_MODULE,
989 .release = vhost_scsi_release,
990 .unlocked_ioctl = vhost_scsi_ioctl,
992 .compat_ioctl = vhost_scsi_compat_ioctl,
994 .open = vhost_scsi_open,
995 .llseek = noop_llseek,
998 static struct miscdevice vhost_scsi_misc = {
1004 static int __init vhost_scsi_register(void)
1006 return misc_register(&vhost_scsi_misc);
1009 static int vhost_scsi_deregister(void)
1011 return misc_deregister(&vhost_scsi_misc);
1014 static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport)
1016 switch (tport->tport_proto_id) {
1017 case SCSI_PROTOCOL_SAS:
1019 case SCSI_PROTOCOL_FCP:
1021 case SCSI_PROTOCOL_ISCSI:
1030 static int tcm_vhost_port_link(struct se_portal_group *se_tpg,
1033 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1034 struct tcm_vhost_tpg, se_tpg);
1036 mutex_lock(&tv_tpg->tv_tpg_mutex);
1037 tv_tpg->tv_tpg_port_count++;
1038 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1043 static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg,
1044 struct se_lun *se_lun)
1046 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1047 struct tcm_vhost_tpg, se_tpg);
1049 mutex_lock(&tv_tpg->tv_tpg_mutex);
1050 tv_tpg->tv_tpg_port_count--;
1051 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1054 static struct se_node_acl *tcm_vhost_make_nodeacl(
1055 struct se_portal_group *se_tpg,
1056 struct config_group *group,
1059 struct se_node_acl *se_nacl, *se_nacl_new;
1060 struct tcm_vhost_nacl *nacl;
1064 /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1065 return ERR_PTR(-EINVAL); */
1066 se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg);
1068 return ERR_PTR(-ENOMEM);
1072 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1073 * when converting a NodeACL from demo mode -> explict
1075 se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1077 if (IS_ERR(se_nacl)) {
1078 tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new);
1082 * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN
1084 nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl);
1085 nacl->iport_wwpn = wwpn;
1090 static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl)
1092 struct tcm_vhost_nacl *nacl = container_of(se_acl,
1093 struct tcm_vhost_nacl, se_node_acl);
1094 core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1098 static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tv_tpg,
1101 struct se_portal_group *se_tpg;
1102 struct tcm_vhost_nexus *tv_nexus;
1104 mutex_lock(&tv_tpg->tv_tpg_mutex);
1105 if (tv_tpg->tpg_nexus) {
1106 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1107 pr_debug("tv_tpg->tpg_nexus already exists\n");
1110 se_tpg = &tv_tpg->se_tpg;
1112 tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL);
1114 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1115 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1119 * Initialize the struct se_session pointer
1121 tv_nexus->tvn_se_sess = transport_init_session();
1122 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1123 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1128 * Since we are running in 'demo mode' this call with generate a
1129 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1130 * the SCSI Initiator port name of the passed configfs group 'name'.
1132 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1133 se_tpg, (unsigned char *)name);
1134 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1135 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1136 pr_debug("core_tpg_check_initiator_node_acl() failed"
1138 transport_free_session(tv_nexus->tvn_se_sess);
1143 * Now register the TCM vhost virtual I_T Nexus as active with the
1144 * call to __transport_register_session()
1146 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1147 tv_nexus->tvn_se_sess, tv_nexus);
1148 tv_tpg->tpg_nexus = tv_nexus;
1150 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1154 static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg *tpg)
1156 struct se_session *se_sess;
1157 struct tcm_vhost_nexus *tv_nexus;
1159 mutex_lock(&tpg->tv_tpg_mutex);
1160 tv_nexus = tpg->tpg_nexus;
1162 mutex_unlock(&tpg->tv_tpg_mutex);
1166 se_sess = tv_nexus->tvn_se_sess;
1168 mutex_unlock(&tpg->tv_tpg_mutex);
1172 if (tpg->tv_tpg_port_count != 0) {
1173 mutex_unlock(&tpg->tv_tpg_mutex);
1174 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1175 " active TPG port count: %d\n",
1176 tpg->tv_tpg_port_count);
1180 if (tpg->tv_tpg_vhost_count != 0) {
1181 mutex_unlock(&tpg->tv_tpg_mutex);
1182 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1183 " active TPG vhost count: %d\n",
1184 tpg->tv_tpg_vhost_count);
1188 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
1189 " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport),
1190 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1192 * Release the SCSI I_T Nexus to the emulated vhost Target Port
1194 transport_deregister_session(tv_nexus->tvn_se_sess);
1195 tpg->tpg_nexus = NULL;
1196 mutex_unlock(&tpg->tv_tpg_mutex);
1202 static ssize_t tcm_vhost_tpg_show_nexus(struct se_portal_group *se_tpg,
1205 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1206 struct tcm_vhost_tpg, se_tpg);
1207 struct tcm_vhost_nexus *tv_nexus;
1210 mutex_lock(&tv_tpg->tv_tpg_mutex);
1211 tv_nexus = tv_tpg->tpg_nexus;
1213 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1216 ret = snprintf(page, PAGE_SIZE, "%s\n",
1217 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1218 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1223 static ssize_t tcm_vhost_tpg_store_nexus(struct se_portal_group *se_tpg,
1227 struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1228 struct tcm_vhost_tpg, se_tpg);
1229 struct tcm_vhost_tport *tport_wwn = tv_tpg->tport;
1230 unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr;
1233 * Shutdown the active I_T nexus if 'NULL' is passed..
1235 if (!strncmp(page, "NULL", 4)) {
1236 ret = tcm_vhost_drop_nexus(tv_tpg);
1237 return (!ret) ? count : ret;
1240 * Otherwise make sure the passed virtual Initiator port WWN matches
1241 * the fabric protocol_id set in tcm_vhost_make_tport(), and call
1242 * tcm_vhost_make_nexus().
1244 if (strlen(page) >= TCM_VHOST_NAMELEN) {
1245 pr_err("Emulated NAA Sas Address: %s, exceeds"
1246 " max: %d\n", page, TCM_VHOST_NAMELEN);
1249 snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page);
1251 ptr = strstr(i_port, "naa.");
1253 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1254 pr_err("Passed SAS Initiator Port %s does not"
1255 " match target port protoid: %s\n", i_port,
1256 tcm_vhost_dump_proto_id(tport_wwn));
1259 port_ptr = &i_port[0];
1262 ptr = strstr(i_port, "fc.");
1264 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1265 pr_err("Passed FCP Initiator Port %s does not"
1266 " match target port protoid: %s\n", i_port,
1267 tcm_vhost_dump_proto_id(tport_wwn));
1270 port_ptr = &i_port[3]; /* Skip over "fc." */
1273 ptr = strstr(i_port, "iqn.");
1275 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1276 pr_err("Passed iSCSI Initiator Port %s does not"
1277 " match target port protoid: %s\n", i_port,
1278 tcm_vhost_dump_proto_id(tport_wwn));
1281 port_ptr = &i_port[0];
1284 pr_err("Unable to locate prefix for emulated Initiator Port:"
1288 * Clear any trailing newline for the NAA WWN
1291 if (i_port[strlen(i_port)-1] == '\n')
1292 i_port[strlen(i_port)-1] = '\0';
1294 ret = tcm_vhost_make_nexus(tv_tpg, port_ptr);
1301 TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR);
1303 static struct configfs_attribute *tcm_vhost_tpg_attrs[] = {
1304 &tcm_vhost_tpg_nexus.attr,
1308 static struct se_portal_group *tcm_vhost_make_tpg(struct se_wwn *wwn,
1309 struct config_group *group,
1312 struct tcm_vhost_tport *tport = container_of(wwn,
1313 struct tcm_vhost_tport, tport_wwn);
1315 struct tcm_vhost_tpg *tpg;
1319 if (strstr(name, "tpgt_") != name)
1320 return ERR_PTR(-EINVAL);
1321 if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
1322 return ERR_PTR(-EINVAL);
1324 tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL);
1326 pr_err("Unable to allocate struct tcm_vhost_tpg");
1327 return ERR_PTR(-ENOMEM);
1329 mutex_init(&tpg->tv_tpg_mutex);
1330 INIT_LIST_HEAD(&tpg->tv_tpg_list);
1332 tpg->tport_tpgt = tpgt;
1334 ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn,
1335 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
1340 mutex_lock(&tcm_vhost_mutex);
1341 list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list);
1342 mutex_unlock(&tcm_vhost_mutex);
1344 return &tpg->se_tpg;
1347 static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg)
1349 struct tcm_vhost_tpg *tpg = container_of(se_tpg,
1350 struct tcm_vhost_tpg, se_tpg);
1352 mutex_lock(&tcm_vhost_mutex);
1353 list_del(&tpg->tv_tpg_list);
1354 mutex_unlock(&tcm_vhost_mutex);
1356 * Release the virtual I_T Nexus for this vhost TPG
1358 tcm_vhost_drop_nexus(tpg);
1360 * Deregister the se_tpg from TCM..
1362 core_tpg_deregister(se_tpg);
1366 static struct se_wwn *tcm_vhost_make_tport(struct target_fabric_configfs *tf,
1367 struct config_group *group,
1370 struct tcm_vhost_tport *tport;
1375 /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1376 return ERR_PTR(-EINVAL); */
1378 tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL);
1380 pr_err("Unable to allocate struct tcm_vhost_tport");
1381 return ERR_PTR(-ENOMEM);
1383 tport->tport_wwpn = wwpn;
1385 * Determine the emulated Protocol Identifier and Target Port Name
1386 * based on the incoming configfs directory name.
1388 ptr = strstr(name, "naa.");
1390 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
1393 ptr = strstr(name, "fc.");
1395 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
1396 off = 3; /* Skip over "fc." */
1399 ptr = strstr(name, "iqn.");
1401 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
1405 pr_err("Unable to locate prefix for emulated Target Port:"
1408 return ERR_PTR(-EINVAL);
1411 if (strlen(name) >= TCM_VHOST_NAMELEN) {
1412 pr_err("Emulated %s Address: %s, exceeds"
1413 " max: %d\n", name, tcm_vhost_dump_proto_id(tport),
1416 return ERR_PTR(-EINVAL);
1418 snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]);
1420 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
1421 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name);
1423 return &tport->tport_wwn;
1426 static void tcm_vhost_drop_tport(struct se_wwn *wwn)
1428 struct tcm_vhost_tport *tport = container_of(wwn,
1429 struct tcm_vhost_tport, tport_wwn);
1431 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
1432 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport),
1438 static ssize_t tcm_vhost_wwn_show_attr_version(
1439 struct target_fabric_configfs *tf,
1442 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
1443 "on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
1444 utsname()->machine);
1447 TF_WWN_ATTR_RO(tcm_vhost, version);
1449 static struct configfs_attribute *tcm_vhost_wwn_attrs[] = {
1450 &tcm_vhost_wwn_version.attr,
1454 static struct target_core_fabric_ops tcm_vhost_ops = {
1455 .get_fabric_name = tcm_vhost_get_fabric_name,
1456 .get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident,
1457 .tpg_get_wwn = tcm_vhost_get_fabric_wwn,
1458 .tpg_get_tag = tcm_vhost_get_tag,
1459 .tpg_get_default_depth = tcm_vhost_get_default_depth,
1460 .tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id,
1461 .tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len,
1462 .tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id,
1463 .tpg_check_demo_mode = tcm_vhost_check_true,
1464 .tpg_check_demo_mode_cache = tcm_vhost_check_true,
1465 .tpg_check_demo_mode_write_protect = tcm_vhost_check_false,
1466 .tpg_check_prod_mode_write_protect = tcm_vhost_check_false,
1467 .tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl,
1468 .tpg_release_fabric_acl = tcm_vhost_release_fabric_acl,
1469 .tpg_get_inst_index = tcm_vhost_tpg_get_inst_index,
1470 .release_cmd = tcm_vhost_release_cmd,
1471 .shutdown_session = tcm_vhost_shutdown_session,
1472 .close_session = tcm_vhost_close_session,
1473 .sess_get_index = tcm_vhost_sess_get_index,
1474 .sess_get_initiator_sid = NULL,
1475 .write_pending = tcm_vhost_write_pending,
1476 .write_pending_status = tcm_vhost_write_pending_status,
1477 .set_default_node_attributes = tcm_vhost_set_default_node_attrs,
1478 .get_task_tag = tcm_vhost_get_task_tag,
1479 .get_cmd_state = tcm_vhost_get_cmd_state,
1480 .queue_data_in = tcm_vhost_queue_data_in,
1481 .queue_status = tcm_vhost_queue_status,
1482 .queue_tm_rsp = tcm_vhost_queue_tm_rsp,
1484 * Setup callers for generic logic in target_core_fabric_configfs.c
1486 .fabric_make_wwn = tcm_vhost_make_tport,
1487 .fabric_drop_wwn = tcm_vhost_drop_tport,
1488 .fabric_make_tpg = tcm_vhost_make_tpg,
1489 .fabric_drop_tpg = tcm_vhost_drop_tpg,
1490 .fabric_post_link = tcm_vhost_port_link,
1491 .fabric_pre_unlink = tcm_vhost_port_unlink,
1492 .fabric_make_np = NULL,
1493 .fabric_drop_np = NULL,
1494 .fabric_make_nodeacl = tcm_vhost_make_nodeacl,
1495 .fabric_drop_nodeacl = tcm_vhost_drop_nodeacl,
1498 static int tcm_vhost_register_configfs(void)
1500 struct target_fabric_configfs *fabric;
1503 pr_debug("TCM_VHOST fabric module %s on %s/%s"
1504 " on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
1505 utsname()->machine);
1507 * Register the top level struct config_item_type with TCM core
1509 fabric = target_fabric_configfs_init(THIS_MODULE, "vhost");
1510 if (IS_ERR(fabric)) {
1511 pr_err("target_fabric_configfs_init() failed\n");
1512 return PTR_ERR(fabric);
1515 * Setup fabric->tf_ops from our local tcm_vhost_ops
1517 fabric->tf_ops = tcm_vhost_ops;
1519 * Setup default attribute lists for various fabric->tf_cit_tmpl
1521 TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs;
1522 TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs;
1523 TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1524 TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1525 TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1526 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
1527 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
1528 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
1529 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
1531 * Register the fabric for use within TCM
1533 ret = target_fabric_configfs_register(fabric);
1535 pr_err("target_fabric_configfs_register() failed"
1536 " for TCM_VHOST\n");
1540 * Setup our local pointer to *fabric
1542 tcm_vhost_fabric_configfs = fabric;
1543 pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n");
1547 static void tcm_vhost_deregister_configfs(void)
1549 if (!tcm_vhost_fabric_configfs)
1552 target_fabric_configfs_deregister(tcm_vhost_fabric_configfs);
1553 tcm_vhost_fabric_configfs = NULL;
1554 pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n");
1557 static int __init tcm_vhost_init(void)
1561 * Use our own dedicated workqueue for submitting I/O into
1562 * target core to avoid contention within system_wq.
1564 tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0);
1565 if (!tcm_vhost_workqueue)
1568 ret = vhost_scsi_register();
1570 goto out_destroy_workqueue;
1572 ret = tcm_vhost_register_configfs();
1574 goto out_vhost_scsi_deregister;
1578 out_vhost_scsi_deregister:
1579 vhost_scsi_deregister();
1580 out_destroy_workqueue:
1581 destroy_workqueue(tcm_vhost_workqueue);
1586 static void tcm_vhost_exit(void)
1588 tcm_vhost_deregister_configfs();
1589 vhost_scsi_deregister();
1590 destroy_workqueue(tcm_vhost_workqueue);
1593 MODULE_DESCRIPTION("TCM_VHOST series fabric driver");
1594 MODULE_LICENSE("GPL");
1595 module_init(tcm_vhost_init);
1596 module_exit(tcm_vhost_exit);