mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Nicholas Bellinger](/assets/img/avatar_default.png)
This patch adds the initial code for tcm_vhost, a Vhost level TCM fabric driver for virtio SCSI initiators into KVM guest. This code is currently up and running on v3.5-rc2 host+guest from target-pending/for-next-merge. Using tcm_vhost requires Zhi's -> Stefan -> nab's qemu vhost-scsi tree here: http://git.kernel.org/?p=virt/kvm/nab/qemu-kvm.git;a=shortlog;h=refs/heads/vhost-scsi -- Changelog v4 -> v5: Expose ABI version via VHOST_SCSI_GET_ABI_VERSION + use Rev 0 as starting point for v3.6-rc code (Stefan + ALiguori + nab) Convert vhost_scsi_handle_vq() to vq_err() (nab + MST) Minor style fixes from checkpatch (nab) Changelog v3 -> v4: Rename vhost_vring_target -> vhost_scsi_target (mst + nab) Use TRANSPORT_IQN_LEN in vhost_scsi_target->vhost_wwpn[] def (nab) Move back to drivers/vhost/, and just use drivers/vhost/Kconfig.tcm (mst) Move TCM_VHOST related ioctl defines from include/linux/vhost.h -> drivers/vhost/tcm_vhost.h as requested by MST (nab) Move Kbuild.tcm include from drivers/staging -> drivers/vhost/, and just use 'if STAGING' around 'source drivers/vhost/Kbuild.tcm' Changelog v2 -> v3: Unlock on error in tcm_vhost_drop_nexus() (DanC) Fix strlen() doesn't count the terminator (DanC) Call kfree() on an error path (DanC) Convert tcm_vhost_write_pending to use target_execute_cmd (hch + nab) Fix another strlen() off by one in tcm_vhost_make_tport (DanC) Add option under drivers/staging/Kconfig, and move to drivers/vhost/tcm/ as requested by MST (nab) Changelog v1 -> v2: Fix tv_cmd completion -> release SGL memory leak (nab) Fix sparse warnings for static variable usage ((Fengguang Wu) Fix sparse warnings for min() typing + printk format specs (Fengguang Wu) Convert to cmwq submission for I/O dispatch (nab + hch) Changelog v0 -> v1: Merge into single source + header file, and move to drivers/vhost/ Acked-by: Michael S. Tsirkin <mst@redhat.com> Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Cc: Anthony Liguori <aliguori@us.ibm.com> Cc: Zhi Yong Wu <wuzhy@cn.ibm.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
1628 lines
42 KiB
C
1628 lines
42 KiB
C
/*******************************************************************************
|
|
* Vhost kernel TCM fabric driver for virtio SCSI initiators
|
|
*
|
|
* (C) Copyright 2010-2012 RisingTide Systems LLC.
|
|
* (C) Copyright 2010-2012 IBM Corp.
|
|
*
|
|
* Licensed to the Linux Foundation under the General Public License (GPL) version 2.
|
|
*
|
|
* Authors: Nicholas A. Bellinger <nab@risingtidesystems.com>
|
|
* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <generated/utsrelease.h>
|
|
#include <linux/utsname.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
#include <linux/configfs.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/compat.h>
|
|
#include <linux/eventfd.h>
|
|
#include <linux/vhost.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/miscdevice.h>
|
|
#include <asm/unaligned.h>
|
|
#include <scsi/scsi.h>
|
|
#include <scsi/scsi_tcq.h>
|
|
#include <target/target_core_base.h>
|
|
#include <target/target_core_fabric.h>
|
|
#include <target/target_core_fabric_configfs.h>
|
|
#include <target/target_core_configfs.h>
|
|
#include <target/configfs_macros.h>
|
|
#include <linux/vhost.h>
|
|
#include <linux/virtio_net.h> /* TODO vhost.h currently depends on this */
|
|
#include <linux/virtio_scsi.h>
|
|
|
|
#include "vhost.c"
|
|
#include "vhost.h"
|
|
#include "tcm_vhost.h"
|
|
|
|
struct vhost_scsi {
|
|
atomic_t vhost_ref_cnt;
|
|
struct tcm_vhost_tpg *vs_tpg;
|
|
struct vhost_dev dev;
|
|
struct vhost_virtqueue vqs[3];
|
|
|
|
struct vhost_work vs_completion_work; /* cmd completion work item */
|
|
struct list_head vs_completion_list; /* cmd completion queue */
|
|
spinlock_t vs_completion_lock; /* protects s_completion_list */
|
|
};
|
|
|
|
/* Local pointer to allocated TCM configfs fabric module */
|
|
static struct target_fabric_configfs *tcm_vhost_fabric_configfs;
|
|
|
|
static struct workqueue_struct *tcm_vhost_workqueue;
|
|
|
|
/* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */
|
|
static DEFINE_MUTEX(tcm_vhost_mutex);
|
|
static LIST_HEAD(tcm_vhost_list);
|
|
|
|
static int tcm_vhost_check_true(struct se_portal_group *se_tpg)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int tcm_vhost_check_false(struct se_portal_group *se_tpg)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static char *tcm_vhost_get_fabric_name(void)
|
|
{
|
|
return "vhost";
|
|
}
|
|
|
|
static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg)
|
|
{
|
|
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
|
|
struct tcm_vhost_tpg, se_tpg);
|
|
struct tcm_vhost_tport *tport = tpg->tport;
|
|
|
|
switch (tport->tport_proto_id) {
|
|
case SCSI_PROTOCOL_SAS:
|
|
return sas_get_fabric_proto_ident(se_tpg);
|
|
case SCSI_PROTOCOL_FCP:
|
|
return fc_get_fabric_proto_ident(se_tpg);
|
|
case SCSI_PROTOCOL_ISCSI:
|
|
return iscsi_get_fabric_proto_ident(se_tpg);
|
|
default:
|
|
pr_err("Unknown tport_proto_id: 0x%02x, using"
|
|
" SAS emulation\n", tport->tport_proto_id);
|
|
break;
|
|
}
|
|
|
|
return sas_get_fabric_proto_ident(se_tpg);
|
|
}
|
|
|
|
static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg)
|
|
{
|
|
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
|
|
struct tcm_vhost_tpg, se_tpg);
|
|
struct tcm_vhost_tport *tport = tpg->tport;
|
|
|
|
return &tport->tport_name[0];
|
|
}
|
|
|
|
static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg)
|
|
{
|
|
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
|
|
struct tcm_vhost_tpg, se_tpg);
|
|
return tpg->tport_tpgt;
|
|
}
|
|
|
|
static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static u32 tcm_vhost_get_pr_transport_id(
|
|
struct se_portal_group *se_tpg,
|
|
struct se_node_acl *se_nacl,
|
|
struct t10_pr_registration *pr_reg,
|
|
int *format_code,
|
|
unsigned char *buf)
|
|
{
|
|
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
|
|
struct tcm_vhost_tpg, se_tpg);
|
|
struct tcm_vhost_tport *tport = tpg->tport;
|
|
|
|
switch (tport->tport_proto_id) {
|
|
case SCSI_PROTOCOL_SAS:
|
|
return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
|
|
format_code, buf);
|
|
case SCSI_PROTOCOL_FCP:
|
|
return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
|
|
format_code, buf);
|
|
case SCSI_PROTOCOL_ISCSI:
|
|
return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
|
|
format_code, buf);
|
|
default:
|
|
pr_err("Unknown tport_proto_id: 0x%02x, using"
|
|
" SAS emulation\n", tport->tport_proto_id);
|
|
break;
|
|
}
|
|
|
|
return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
|
|
format_code, buf);
|
|
}
|
|
|
|
static u32 tcm_vhost_get_pr_transport_id_len(
|
|
struct se_portal_group *se_tpg,
|
|
struct se_node_acl *se_nacl,
|
|
struct t10_pr_registration *pr_reg,
|
|
int *format_code)
|
|
{
|
|
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
|
|
struct tcm_vhost_tpg, se_tpg);
|
|
struct tcm_vhost_tport *tport = tpg->tport;
|
|
|
|
switch (tport->tport_proto_id) {
|
|
case SCSI_PROTOCOL_SAS:
|
|
return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
|
|
format_code);
|
|
case SCSI_PROTOCOL_FCP:
|
|
return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
|
|
format_code);
|
|
case SCSI_PROTOCOL_ISCSI:
|
|
return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
|
|
format_code);
|
|
default:
|
|
pr_err("Unknown tport_proto_id: 0x%02x, using"
|
|
" SAS emulation\n", tport->tport_proto_id);
|
|
break;
|
|
}
|
|
|
|
return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
|
|
format_code);
|
|
}
|
|
|
|
static char *tcm_vhost_parse_pr_out_transport_id(
|
|
struct se_portal_group *se_tpg,
|
|
const char *buf,
|
|
u32 *out_tid_len,
|
|
char **port_nexus_ptr)
|
|
{
|
|
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
|
|
struct tcm_vhost_tpg, se_tpg);
|
|
struct tcm_vhost_tport *tport = tpg->tport;
|
|
|
|
switch (tport->tport_proto_id) {
|
|
case SCSI_PROTOCOL_SAS:
|
|
return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
|
|
port_nexus_ptr);
|
|
case SCSI_PROTOCOL_FCP:
|
|
return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
|
|
port_nexus_ptr);
|
|
case SCSI_PROTOCOL_ISCSI:
|
|
return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
|
|
port_nexus_ptr);
|
|
default:
|
|
pr_err("Unknown tport_proto_id: 0x%02x, using"
|
|
" SAS emulation\n", tport->tport_proto_id);
|
|
break;
|
|
}
|
|
|
|
return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
|
|
port_nexus_ptr);
|
|
}
|
|
|
|
static struct se_node_acl *tcm_vhost_alloc_fabric_acl(
|
|
struct se_portal_group *se_tpg)
|
|
{
|
|
struct tcm_vhost_nacl *nacl;
|
|
|
|
nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL);
|
|
if (!nacl) {
|
|
pr_err("Unable to alocate struct tcm_vhost_nacl\n");
|
|
return NULL;
|
|
}
|
|
|
|
return &nacl->se_node_acl;
|
|
}
|
|
|
|
static void tcm_vhost_release_fabric_acl(
|
|
struct se_portal_group *se_tpg,
|
|
struct se_node_acl *se_nacl)
|
|
{
|
|
struct tcm_vhost_nacl *nacl = container_of(se_nacl,
|
|
struct tcm_vhost_nacl, se_node_acl);
|
|
kfree(nacl);
|
|
}
|
|
|
|
static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static void tcm_vhost_release_cmd(struct se_cmd *se_cmd)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static int tcm_vhost_shutdown_session(struct se_session *se_sess)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void tcm_vhost_close_session(struct se_session *se_sess)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static u32 tcm_vhost_sess_get_index(struct se_session *se_sess)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int tcm_vhost_write_pending(struct se_cmd *se_cmd)
|
|
{
|
|
/* Go ahead and process the write immediately */
|
|
target_execute_cmd(se_cmd);
|
|
return 0;
|
|
}
|
|
|
|
static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *);
|
|
|
|
static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd)
|
|
{
|
|
struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
|
|
struct tcm_vhost_cmd, tvc_se_cmd);
|
|
vhost_scsi_complete_cmd(tv_cmd);
|
|
return 0;
|
|
}
|
|
|
|
static int tcm_vhost_queue_status(struct se_cmd *se_cmd)
|
|
{
|
|
struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
|
|
struct tcm_vhost_cmd, tvc_se_cmd);
|
|
vhost_scsi_complete_cmd(tv_cmd);
|
|
return 0;
|
|
}
|
|
|
|
static int tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static u16 tcm_vhost_set_fabric_sense_len(struct se_cmd *se_cmd,
|
|
u32 sense_length)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static u16 tcm_vhost_get_fabric_sense_len(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd)
|
|
{
|
|
struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
|
|
|
|
/* TODO locking against target/backend threads? */
|
|
transport_generic_free_cmd(se_cmd, 1);
|
|
|
|
if (tv_cmd->tvc_sgl_count) {
|
|
u32 i;
|
|
for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
|
|
put_page(sg_page(&tv_cmd->tvc_sgl[i]));
|
|
|
|
kfree(tv_cmd->tvc_sgl);
|
|
}
|
|
|
|
kfree(tv_cmd);
|
|
}
|
|
|
|
/* Dequeue a command from the completion list */
|
|
static struct tcm_vhost_cmd *vhost_scsi_get_cmd_from_completion(
|
|
struct vhost_scsi *vs)
|
|
{
|
|
struct tcm_vhost_cmd *tv_cmd = NULL;
|
|
|
|
spin_lock_bh(&vs->vs_completion_lock);
|
|
if (list_empty(&vs->vs_completion_list)) {
|
|
spin_unlock_bh(&vs->vs_completion_lock);
|
|
return NULL;
|
|
}
|
|
|
|
list_for_each_entry(tv_cmd, &vs->vs_completion_list,
|
|
tvc_completion_list) {
|
|
list_del(&tv_cmd->tvc_completion_list);
|
|
break;
|
|
}
|
|
spin_unlock_bh(&vs->vs_completion_lock);
|
|
return tv_cmd;
|
|
}
|
|
|
|
/* Fill in status and signal that we are done processing this command
|
|
*
|
|
* This is scheduled in the vhost work queue so we are called with the owner
|
|
* process mm and can access the vring.
|
|
*/
|
|
static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
|
|
{
|
|
struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
|
|
vs_completion_work);
|
|
struct tcm_vhost_cmd *tv_cmd;
|
|
|
|
while ((tv_cmd = vhost_scsi_get_cmd_from_completion(vs)) != NULL) {
|
|
struct virtio_scsi_cmd_resp v_rsp;
|
|
struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
|
|
int ret;
|
|
|
|
pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
|
|
tv_cmd, se_cmd->residual_count, se_cmd->scsi_status);
|
|
|
|
memset(&v_rsp, 0, sizeof(v_rsp));
|
|
v_rsp.resid = se_cmd->residual_count;
|
|
/* TODO is status_qualifier field needed? */
|
|
v_rsp.status = se_cmd->scsi_status;
|
|
v_rsp.sense_len = se_cmd->scsi_sense_length;
|
|
memcpy(v_rsp.sense, tv_cmd->tvc_sense_buf,
|
|
v_rsp.sense_len);
|
|
ret = copy_to_user(tv_cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
|
|
if (likely(ret == 0))
|
|
vhost_add_used(&vs->vqs[2], tv_cmd->tvc_vq_desc, 0);
|
|
else
|
|
pr_err("Faulted on virtio_scsi_cmd_resp\n");
|
|
|
|
vhost_scsi_free_cmd(tv_cmd);
|
|
}
|
|
|
|
vhost_signal(&vs->dev, &vs->vqs[2]);
|
|
}
|
|
|
|
static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *tv_cmd)
|
|
{
|
|
struct vhost_scsi *vs = tv_cmd->tvc_vhost;
|
|
|
|
pr_debug("%s tv_cmd %p\n", __func__, tv_cmd);
|
|
|
|
spin_lock_bh(&vs->vs_completion_lock);
|
|
list_add_tail(&tv_cmd->tvc_completion_list, &vs->vs_completion_list);
|
|
spin_unlock_bh(&vs->vs_completion_lock);
|
|
|
|
vhost_work_queue(&vs->dev, &vs->vs_completion_work);
|
|
}
|
|
|
|
static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd(
|
|
struct tcm_vhost_tpg *tv_tpg,
|
|
struct virtio_scsi_cmd_req *v_req,
|
|
u32 exp_data_len,
|
|
int data_direction)
|
|
{
|
|
struct tcm_vhost_cmd *tv_cmd;
|
|
struct tcm_vhost_nexus *tv_nexus;
|
|
struct se_portal_group *se_tpg = &tv_tpg->se_tpg;
|
|
struct se_session *se_sess;
|
|
struct se_cmd *se_cmd;
|
|
int sam_task_attr;
|
|
|
|
tv_nexus = tv_tpg->tpg_nexus;
|
|
if (!tv_nexus) {
|
|
pr_err("Unable to locate active struct tcm_vhost_nexus\n");
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
se_sess = tv_nexus->tvn_se_sess;
|
|
|
|
tv_cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC);
|
|
if (!tv_cmd) {
|
|
pr_err("Unable to allocate struct tcm_vhost_cmd\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
INIT_LIST_HEAD(&tv_cmd->tvc_completion_list);
|
|
tv_cmd->tvc_tag = v_req->tag;
|
|
|
|
se_cmd = &tv_cmd->tvc_se_cmd;
|
|
/*
|
|
* Locate the SAM Task Attr from virtio_scsi_cmd_req
|
|
*/
|
|
sam_task_attr = v_req->task_attr;
|
|
/*
|
|
* Initialize struct se_cmd descriptor from TCM infrastructure
|
|
*/
|
|
transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, exp_data_len,
|
|
data_direction, sam_task_attr,
|
|
&tv_cmd->tvc_sense_buf[0]);
|
|
|
|
#if 0 /* FIXME: vhost_scsi_allocate_cmd() BIDI operation */
|
|
if (bidi)
|
|
se_cmd->se_cmd_flags |= SCF_BIDI;
|
|
#endif
|
|
return tv_cmd;
|
|
}
|
|
|
|
/*
|
|
* Map a user memory range into a scatterlist
|
|
*
|
|
* Returns the number of scatterlist entries used or -errno on error.
|
|
*/
|
|
static int vhost_scsi_map_to_sgl(struct scatterlist *sgl,
|
|
unsigned int sgl_count, void __user *ptr, size_t len, int write)
|
|
{
|
|
struct scatterlist *sg = sgl;
|
|
unsigned int npages = 0;
|
|
int ret;
|
|
|
|
while (len > 0) {
|
|
struct page *page;
|
|
unsigned int offset = (uintptr_t)ptr & ~PAGE_MASK;
|
|
unsigned int nbytes = min_t(unsigned int,
|
|
PAGE_SIZE - offset, len);
|
|
|
|
if (npages == sgl_count) {
|
|
ret = -ENOBUFS;
|
|
goto err;
|
|
}
|
|
|
|
ret = get_user_pages_fast((unsigned long)ptr, 1, write, &page);
|
|
BUG_ON(ret == 0); /* we should either get our page or fail */
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
sg_set_page(sg, page, nbytes, offset);
|
|
ptr += nbytes;
|
|
len -= nbytes;
|
|
sg++;
|
|
npages++;
|
|
}
|
|
return npages;
|
|
|
|
err:
|
|
/* Put pages that we hold */
|
|
for (sg = sgl; sg != &sgl[npages]; sg++)
|
|
put_page(sg_page(sg));
|
|
return ret;
|
|
}
|
|
|
|
static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd,
|
|
struct iovec *iov, unsigned int niov, int write)
|
|
{
|
|
int ret;
|
|
unsigned int i;
|
|
u32 sgl_count;
|
|
struct scatterlist *sg;
|
|
|
|
/*
|
|
* Find out how long sglist needs to be
|
|
*/
|
|
sgl_count = 0;
|
|
for (i = 0; i < niov; i++) {
|
|
sgl_count += (((uintptr_t)iov[i].iov_base + iov[i].iov_len +
|
|
PAGE_SIZE - 1) >> PAGE_SHIFT) -
|
|
((uintptr_t)iov[i].iov_base >> PAGE_SHIFT);
|
|
}
|
|
/* TODO overflow checking */
|
|
|
|
sg = kmalloc(sizeof(tv_cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC);
|
|
if (!sg)
|
|
return -ENOMEM;
|
|
pr_debug("%s sg %p sgl_count %u is_err %ld\n", __func__,
|
|
sg, sgl_count, IS_ERR(sg));
|
|
sg_init_table(sg, sgl_count);
|
|
|
|
tv_cmd->tvc_sgl = sg;
|
|
tv_cmd->tvc_sgl_count = sgl_count;
|
|
|
|
pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count);
|
|
for (i = 0; i < niov; i++) {
|
|
ret = vhost_scsi_map_to_sgl(sg, sgl_count, iov[i].iov_base,
|
|
iov[i].iov_len, write);
|
|
if (ret < 0) {
|
|
for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
|
|
put_page(sg_page(&tv_cmd->tvc_sgl[i]));
|
|
kfree(tv_cmd->tvc_sgl);
|
|
tv_cmd->tvc_sgl = NULL;
|
|
tv_cmd->tvc_sgl_count = 0;
|
|
return ret;
|
|
}
|
|
|
|
sg += ret;
|
|
sgl_count -= ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void tcm_vhost_submission_work(struct work_struct *work)
|
|
{
|
|
struct tcm_vhost_cmd *tv_cmd =
|
|
container_of(work, struct tcm_vhost_cmd, work);
|
|
struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
|
|
struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL;
|
|
int rc, sg_no_bidi = 0;
|
|
/*
|
|
* Locate the struct se_lun pointer based on v_req->lun, and
|
|
* attach it to struct se_cmd
|
|
*/
|
|
rc = transport_lookup_cmd_lun(&tv_cmd->tvc_se_cmd, tv_cmd->tvc_lun);
|
|
if (rc < 0) {
|
|
pr_err("Failed to look up lun: %d\n", tv_cmd->tvc_lun);
|
|
transport_send_check_condition_and_sense(&tv_cmd->tvc_se_cmd,
|
|
tv_cmd->tvc_se_cmd.scsi_sense_reason, 0);
|
|
transport_generic_free_cmd(se_cmd, 0);
|
|
return;
|
|
}
|
|
|
|
rc = target_setup_cmd_from_cdb(se_cmd, tv_cmd->tvc_cdb);
|
|
if (rc == -ENOMEM) {
|
|
transport_send_check_condition_and_sense(se_cmd,
|
|
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
|
|
transport_generic_free_cmd(se_cmd, 0);
|
|
return;
|
|
} else if (rc < 0) {
|
|
if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
|
|
tcm_vhost_queue_status(se_cmd);
|
|
else
|
|
transport_send_check_condition_and_sense(se_cmd,
|
|
se_cmd->scsi_sense_reason, 0);
|
|
transport_generic_free_cmd(se_cmd, 0);
|
|
return;
|
|
}
|
|
|
|
if (tv_cmd->tvc_sgl_count) {
|
|
sg_ptr = tv_cmd->tvc_sgl;
|
|
/*
|
|
* For BIDI commands, pass in the extra READ buffer
|
|
* to transport_generic_map_mem_to_cmd() below..
|
|
*/
|
|
/* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */
|
|
#if 0
|
|
if (se_cmd->se_cmd_flags & SCF_BIDI) {
|
|
sg_bidi_ptr = NULL;
|
|
sg_no_bidi = 0;
|
|
}
|
|
#endif
|
|
} else {
|
|
sg_ptr = NULL;
|
|
}
|
|
|
|
rc = transport_generic_map_mem_to_cmd(se_cmd, sg_ptr,
|
|
tv_cmd->tvc_sgl_count, sg_bidi_ptr,
|
|
sg_no_bidi);
|
|
if (rc < 0) {
|
|
transport_send_check_condition_and_sense(se_cmd,
|
|
se_cmd->scsi_sense_reason, 0);
|
|
transport_generic_free_cmd(se_cmd, 0);
|
|
return;
|
|
}
|
|
transport_handle_cdb_direct(se_cmd);
|
|
}
|
|
|
|
static void vhost_scsi_handle_vq(struct vhost_scsi *vs)
|
|
{
|
|
struct vhost_virtqueue *vq = &vs->vqs[2];
|
|
struct virtio_scsi_cmd_req v_req;
|
|
struct tcm_vhost_tpg *tv_tpg;
|
|
struct tcm_vhost_cmd *tv_cmd;
|
|
u32 exp_data_len, data_first, data_num, data_direction;
|
|
unsigned out, in, i;
|
|
int head, ret;
|
|
|
|
/* Must use ioctl VHOST_SCSI_SET_ENDPOINT */
|
|
tv_tpg = vs->vs_tpg;
|
|
if (unlikely(!tv_tpg)) {
|
|
pr_err("%s endpoint not set\n", __func__);
|
|
return;
|
|
}
|
|
|
|
mutex_lock(&vq->mutex);
|
|
vhost_disable_notify(&vs->dev, vq);
|
|
|
|
for (;;) {
|
|
head = vhost_get_vq_desc(&vs->dev, vq, vq->iov,
|
|
ARRAY_SIZE(vq->iov), &out, &in,
|
|
NULL, NULL);
|
|
pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
|
|
head, out, in);
|
|
/* On error, stop handling until the next kick. */
|
|
if (unlikely(head < 0))
|
|
break;
|
|
/* Nothing new? Wait for eventfd to tell us they refilled. */
|
|
if (head == vq->num) {
|
|
if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
|
|
vhost_disable_notify(&vs->dev, vq);
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* FIXME: BIDI operation */
|
|
if (out == 1 && in == 1) {
|
|
data_direction = DMA_NONE;
|
|
data_first = 0;
|
|
data_num = 0;
|
|
} else if (out == 1 && in > 1) {
|
|
data_direction = DMA_FROM_DEVICE;
|
|
data_first = out + 1;
|
|
data_num = in - 1;
|
|
} else if (out > 1 && in == 1) {
|
|
data_direction = DMA_TO_DEVICE;
|
|
data_first = 1;
|
|
data_num = out - 1;
|
|
} else {
|
|
vq_err(vq, "Invalid buffer layout out: %u in: %u\n",
|
|
out, in);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Check for a sane resp buffer so we can report errors to
|
|
* the guest.
|
|
*/
|
|
if (unlikely(vq->iov[out].iov_len !=
|
|
sizeof(struct virtio_scsi_cmd_resp))) {
|
|
vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
|
|
" bytes\n", vq->iov[out].iov_len);
|
|
break;
|
|
}
|
|
|
|
if (unlikely(vq->iov[0].iov_len != sizeof(v_req))) {
|
|
vq_err(vq, "Expecting virtio_scsi_cmd_req, got %zu"
|
|
" bytes\n", vq->iov[0].iov_len);
|
|
break;
|
|
}
|
|
pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p,"
|
|
" len: %zu\n", vq->iov[0].iov_base, sizeof(v_req));
|
|
ret = __copy_from_user(&v_req, vq->iov[0].iov_base,
|
|
sizeof(v_req));
|
|
if (unlikely(ret)) {
|
|
vq_err(vq, "Faulted on virtio_scsi_cmd_req\n");
|
|
break;
|
|
}
|
|
|
|
exp_data_len = 0;
|
|
for (i = 0; i < data_num; i++)
|
|
exp_data_len += vq->iov[data_first + i].iov_len;
|
|
|
|
tv_cmd = vhost_scsi_allocate_cmd(tv_tpg, &v_req,
|
|
exp_data_len, data_direction);
|
|
if (IS_ERR(tv_cmd)) {
|
|
vq_err(vq, "vhost_scsi_allocate_cmd failed %ld\n",
|
|
PTR_ERR(tv_cmd));
|
|
break;
|
|
}
|
|
pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
|
|
": %d\n", tv_cmd, exp_data_len, data_direction);
|
|
|
|
tv_cmd->tvc_vhost = vs;
|
|
|
|
if (unlikely(vq->iov[out].iov_len !=
|
|
sizeof(struct virtio_scsi_cmd_resp))) {
|
|
vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
|
|
" bytes, out: %d, in: %d\n",
|
|
vq->iov[out].iov_len, out, in);
|
|
break;
|
|
}
|
|
|
|
tv_cmd->tvc_resp = vq->iov[out].iov_base;
|
|
|
|
/*
|
|
* Copy in the recieved CDB descriptor into tv_cmd->tvc_cdb
|
|
* that will be used by tcm_vhost_new_cmd_map() and down into
|
|
* target_setup_cmd_from_cdb()
|
|
*/
|
|
memcpy(tv_cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE);
|
|
/*
|
|
* Check that the recieved CDB size does not exceeded our
|
|
* hardcoded max for tcm_vhost
|
|
*/
|
|
/* TODO what if cdb was too small for varlen cdb header? */
|
|
if (unlikely(scsi_command_size(tv_cmd->tvc_cdb) >
|
|
TCM_VHOST_MAX_CDB_SIZE)) {
|
|
vq_err(vq, "Received SCSI CDB with command_size: %d that"
|
|
" exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
|
|
scsi_command_size(tv_cmd->tvc_cdb),
|
|
TCM_VHOST_MAX_CDB_SIZE);
|
|
break; /* TODO */
|
|
}
|
|
tv_cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
|
|
|
|
pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
|
|
tv_cmd->tvc_cdb[0], tv_cmd->tvc_lun);
|
|
|
|
if (data_direction != DMA_NONE) {
|
|
ret = vhost_scsi_map_iov_to_sgl(tv_cmd,
|
|
&vq->iov[data_first], data_num,
|
|
data_direction == DMA_TO_DEVICE);
|
|
if (unlikely(ret)) {
|
|
vq_err(vq, "Failed to map iov to sgl\n");
|
|
break; /* TODO */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Save the descriptor from vhost_get_vq_desc() to be used to
|
|
* complete the virtio-scsi request in TCM callback context via
|
|
* tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
|
|
*/
|
|
tv_cmd->tvc_vq_desc = head;
|
|
/*
|
|
* Dispatch tv_cmd descriptor for cmwq execution in process
|
|
* context provided by tcm_vhost_workqueue. This also ensures
|
|
* tv_cmd is executed on the same kworker CPU as this vhost
|
|
* thread to gain positive L2 cache locality effects..
|
|
*/
|
|
INIT_WORK(&tv_cmd->work, tcm_vhost_submission_work);
|
|
queue_work(tcm_vhost_workqueue, &tv_cmd->work);
|
|
}
|
|
|
|
mutex_unlock(&vq->mutex);
|
|
}
|
|
|
|
static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
|
|
{
|
|
pr_err("%s: The handling func for control queue.\n", __func__);
|
|
}
|
|
|
|
static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
|
|
{
|
|
pr_err("%s: The handling func for event queue.\n", __func__);
|
|
}
|
|
|
|
static void vhost_scsi_handle_kick(struct vhost_work *work)
|
|
{
|
|
struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
|
|
poll.work);
|
|
struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
|
|
|
|
vhost_scsi_handle_vq(vs);
|
|
}
|
|
|
|
/*
|
|
* Called from vhost_scsi_ioctl() context to walk the list of available
|
|
* tcm_vhost_tpg with an active struct tcm_vhost_nexus
|
|
*/
|
|
static int vhost_scsi_set_endpoint(
|
|
struct vhost_scsi *vs,
|
|
struct vhost_scsi_target *t)
|
|
{
|
|
struct tcm_vhost_tport *tv_tport;
|
|
struct tcm_vhost_tpg *tv_tpg;
|
|
int index;
|
|
|
|
mutex_lock(&vs->dev.mutex);
|
|
/* Verify that ring has been setup correctly. */
|
|
for (index = 0; index < vs->dev.nvqs; ++index) {
|
|
/* Verify that ring has been setup correctly. */
|
|
if (!vhost_vq_access_ok(&vs->vqs[index])) {
|
|
mutex_unlock(&vs->dev.mutex);
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
|
|
if (vs->vs_tpg) {
|
|
mutex_unlock(&vs->dev.mutex);
|
|
return -EEXIST;
|
|
}
|
|
mutex_unlock(&vs->dev.mutex);
|
|
|
|
mutex_lock(&tcm_vhost_mutex);
|
|
list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) {
|
|
mutex_lock(&tv_tpg->tv_tpg_mutex);
|
|
if (!tv_tpg->tpg_nexus) {
|
|
mutex_unlock(&tv_tpg->tv_tpg_mutex);
|
|
continue;
|
|
}
|
|
if (atomic_read(&tv_tpg->tv_tpg_vhost_count)) {
|
|
mutex_unlock(&tv_tpg->tv_tpg_mutex);
|
|
continue;
|
|
}
|
|
tv_tport = tv_tpg->tport;
|
|
|
|
if (!strcmp(tv_tport->tport_name, t->vhost_wwpn) &&
|
|
(tv_tpg->tport_tpgt == t->vhost_tpgt)) {
|
|
atomic_inc(&tv_tpg->tv_tpg_vhost_count);
|
|
smp_mb__after_atomic_inc();
|
|
mutex_unlock(&tv_tpg->tv_tpg_mutex);
|
|
mutex_unlock(&tcm_vhost_mutex);
|
|
|
|
mutex_lock(&vs->dev.mutex);
|
|
vs->vs_tpg = tv_tpg;
|
|
atomic_inc(&vs->vhost_ref_cnt);
|
|
smp_mb__after_atomic_inc();
|
|
mutex_unlock(&vs->dev.mutex);
|
|
return 0;
|
|
}
|
|
mutex_unlock(&tv_tpg->tv_tpg_mutex);
|
|
}
|
|
mutex_unlock(&tcm_vhost_mutex);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int vhost_scsi_clear_endpoint(
|
|
struct vhost_scsi *vs,
|
|
struct vhost_scsi_target *t)
|
|
{
|
|
struct tcm_vhost_tport *tv_tport;
|
|
struct tcm_vhost_tpg *tv_tpg;
|
|
int index;
|
|
|
|
mutex_lock(&vs->dev.mutex);
|
|
/* Verify that ring has been setup correctly. */
|
|
for (index = 0; index < vs->dev.nvqs; ++index) {
|
|
if (!vhost_vq_access_ok(&vs->vqs[index])) {
|
|
mutex_unlock(&vs->dev.mutex);
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
|
|
if (!vs->vs_tpg) {
|
|
mutex_unlock(&vs->dev.mutex);
|
|
return -ENODEV;
|
|
}
|
|
tv_tpg = vs->vs_tpg;
|
|
tv_tport = tv_tpg->tport;
|
|
|
|
if (strcmp(tv_tport->tport_name, t->vhost_wwpn) ||
|
|
(tv_tpg->tport_tpgt != t->vhost_tpgt)) {
|
|
mutex_unlock(&vs->dev.mutex);
|
|
pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu"
|
|
" does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
|
|
tv_tport->tport_name, tv_tpg->tport_tpgt,
|
|
t->vhost_wwpn, t->vhost_tpgt);
|
|
return -EINVAL;
|
|
}
|
|
atomic_dec(&tv_tpg->tv_tpg_vhost_count);
|
|
vs->vs_tpg = NULL;
|
|
mutex_unlock(&vs->dev.mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_scsi_open(struct inode *inode, struct file *f)
|
|
{
|
|
struct vhost_scsi *s;
|
|
int r;
|
|
|
|
s = kzalloc(sizeof(*s), GFP_KERNEL);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
vhost_work_init(&s->vs_completion_work, vhost_scsi_complete_cmd_work);
|
|
INIT_LIST_HEAD(&s->vs_completion_list);
|
|
spin_lock_init(&s->vs_completion_lock);
|
|
|
|
s->vqs[0].handle_kick = vhost_scsi_ctl_handle_kick;
|
|
s->vqs[1].handle_kick = vhost_scsi_evt_handle_kick;
|
|
s->vqs[2].handle_kick = vhost_scsi_handle_kick;
|
|
r = vhost_dev_init(&s->dev, s->vqs, 3);
|
|
if (r < 0) {
|
|
kfree(s);
|
|
return r;
|
|
}
|
|
|
|
f->private_data = s;
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_scsi_release(struct inode *inode, struct file *f)
|
|
{
|
|
struct vhost_scsi *s = f->private_data;
|
|
|
|
if (s->vs_tpg && s->vs_tpg->tport) {
|
|
struct vhost_scsi_target backend;
|
|
|
|
memcpy(backend.vhost_wwpn, s->vs_tpg->tport->tport_name,
|
|
sizeof(backend.vhost_wwpn));
|
|
backend.vhost_tpgt = s->vs_tpg->tport_tpgt;
|
|
vhost_scsi_clear_endpoint(s, &backend);
|
|
}
|
|
|
|
vhost_dev_cleanup(&s->dev, false);
|
|
kfree(s);
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
|
|
{
|
|
if (features & ~VHOST_FEATURES)
|
|
return -EOPNOTSUPP;
|
|
|
|
mutex_lock(&vs->dev.mutex);
|
|
if ((features & (1 << VHOST_F_LOG_ALL)) &&
|
|
!vhost_log_access_ok(&vs->dev)) {
|
|
mutex_unlock(&vs->dev.mutex);
|
|
return -EFAULT;
|
|
}
|
|
vs->dev.acked_features = features;
|
|
/* TODO possibly smp_wmb() and flush vqs */
|
|
mutex_unlock(&vs->dev.mutex);
|
|
return 0;
|
|
}
|
|
|
|
static long vhost_scsi_ioctl(struct file *f, unsigned int ioctl,
|
|
unsigned long arg)
|
|
{
|
|
struct vhost_scsi *vs = f->private_data;
|
|
struct vhost_scsi_target backend;
|
|
void __user *argp = (void __user *)arg;
|
|
u64 __user *featurep = argp;
|
|
u64 features;
|
|
int r;
|
|
|
|
switch (ioctl) {
|
|
case VHOST_SCSI_SET_ENDPOINT:
|
|
if (copy_from_user(&backend, argp, sizeof backend))
|
|
return -EFAULT;
|
|
|
|
return vhost_scsi_set_endpoint(vs, &backend);
|
|
case VHOST_SCSI_CLEAR_ENDPOINT:
|
|
if (copy_from_user(&backend, argp, sizeof backend))
|
|
return -EFAULT;
|
|
|
|
return vhost_scsi_clear_endpoint(vs, &backend);
|
|
case VHOST_SCSI_GET_ABI_VERSION:
|
|
if (copy_from_user(&backend, argp, sizeof backend))
|
|
return -EFAULT;
|
|
|
|
backend.abi_version = VHOST_SCSI_ABI_VERSION;
|
|
|
|
if (copy_to_user(argp, &backend, sizeof backend))
|
|
return -EFAULT;
|
|
return 0;
|
|
case VHOST_GET_FEATURES:
|
|
features = VHOST_FEATURES;
|
|
if (copy_to_user(featurep, &features, sizeof features))
|
|
return -EFAULT;
|
|
return 0;
|
|
case VHOST_SET_FEATURES:
|
|
if (copy_from_user(&features, featurep, sizeof features))
|
|
return -EFAULT;
|
|
return vhost_scsi_set_features(vs, features);
|
|
default:
|
|
mutex_lock(&vs->dev.mutex);
|
|
r = vhost_dev_ioctl(&vs->dev, ioctl, arg);
|
|
mutex_unlock(&vs->dev.mutex);
|
|
return r;
|
|
}
|
|
}
|
|
|
|
static const struct file_operations vhost_scsi_fops = {
|
|
.owner = THIS_MODULE,
|
|
.release = vhost_scsi_release,
|
|
.unlocked_ioctl = vhost_scsi_ioctl,
|
|
/* TODO compat ioctl? */
|
|
.open = vhost_scsi_open,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
static struct miscdevice vhost_scsi_misc = {
|
|
MISC_DYNAMIC_MINOR,
|
|
"vhost-scsi",
|
|
&vhost_scsi_fops,
|
|
};
|
|
|
|
static int __init vhost_scsi_register(void)
|
|
{
|
|
return misc_register(&vhost_scsi_misc);
|
|
}
|
|
|
|
static int vhost_scsi_deregister(void)
|
|
{
|
|
return misc_deregister(&vhost_scsi_misc);
|
|
}
|
|
|
|
static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport)
|
|
{
|
|
switch (tport->tport_proto_id) {
|
|
case SCSI_PROTOCOL_SAS:
|
|
return "SAS";
|
|
case SCSI_PROTOCOL_FCP:
|
|
return "FCP";
|
|
case SCSI_PROTOCOL_ISCSI:
|
|
return "iSCSI";
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return "Unknown";
|
|
}
|
|
|
|
static int tcm_vhost_port_link(
|
|
struct se_portal_group *se_tpg,
|
|
struct se_lun *lun)
|
|
{
|
|
struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
|
|
struct tcm_vhost_tpg, se_tpg);
|
|
|
|
atomic_inc(&tv_tpg->tv_tpg_port_count);
|
|
smp_mb__after_atomic_inc();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tcm_vhost_port_unlink(
|
|
struct se_portal_group *se_tpg,
|
|
struct se_lun *se_lun)
|
|
{
|
|
struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
|
|
struct tcm_vhost_tpg, se_tpg);
|
|
|
|
atomic_dec(&tv_tpg->tv_tpg_port_count);
|
|
smp_mb__after_atomic_dec();
|
|
}
|
|
|
|
static struct se_node_acl *tcm_vhost_make_nodeacl(
|
|
struct se_portal_group *se_tpg,
|
|
struct config_group *group,
|
|
const char *name)
|
|
{
|
|
struct se_node_acl *se_nacl, *se_nacl_new;
|
|
struct tcm_vhost_nacl *nacl;
|
|
u64 wwpn = 0;
|
|
u32 nexus_depth;
|
|
|
|
/* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
|
|
return ERR_PTR(-EINVAL); */
|
|
se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg);
|
|
if (!se_nacl_new)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
nexus_depth = 1;
|
|
/*
|
|
* se_nacl_new may be released by core_tpg_add_initiator_node_acl()
|
|
* when converting a NodeACL from demo mode -> explict
|
|
*/
|
|
se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
|
|
name, nexus_depth);
|
|
if (IS_ERR(se_nacl)) {
|
|
tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new);
|
|
return se_nacl;
|
|
}
|
|
/*
|
|
* Locate our struct tcm_vhost_nacl and set the FC Nport WWPN
|
|
*/
|
|
nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl);
|
|
nacl->iport_wwpn = wwpn;
|
|
|
|
return se_nacl;
|
|
}
|
|
|
|
static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl)
|
|
{
|
|
struct tcm_vhost_nacl *nacl = container_of(se_acl,
|
|
struct tcm_vhost_nacl, se_node_acl);
|
|
core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
|
|
kfree(nacl);
|
|
}
|
|
|
|
static int tcm_vhost_make_nexus(
|
|
struct tcm_vhost_tpg *tv_tpg,
|
|
const char *name)
|
|
{
|
|
struct se_portal_group *se_tpg;
|
|
struct tcm_vhost_nexus *tv_nexus;
|
|
|
|
mutex_lock(&tv_tpg->tv_tpg_mutex);
|
|
if (tv_tpg->tpg_nexus) {
|
|
mutex_unlock(&tv_tpg->tv_tpg_mutex);
|
|
pr_debug("tv_tpg->tpg_nexus already exists\n");
|
|
return -EEXIST;
|
|
}
|
|
se_tpg = &tv_tpg->se_tpg;
|
|
|
|
tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL);
|
|
if (!tv_nexus) {
|
|
mutex_unlock(&tv_tpg->tv_tpg_mutex);
|
|
pr_err("Unable to allocate struct tcm_vhost_nexus\n");
|
|
return -ENOMEM;
|
|
}
|
|
/*
|
|
* Initialize the struct se_session pointer
|
|
*/
|
|
tv_nexus->tvn_se_sess = transport_init_session();
|
|
if (IS_ERR(tv_nexus->tvn_se_sess)) {
|
|
mutex_unlock(&tv_tpg->tv_tpg_mutex);
|
|
kfree(tv_nexus);
|
|
return -ENOMEM;
|
|
}
|
|
/*
|
|
* Since we are running in 'demo mode' this call with generate a
|
|
* struct se_node_acl for the tcm_vhost struct se_portal_group with
|
|
* the SCSI Initiator port name of the passed configfs group 'name'.
|
|
*/
|
|
tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
|
|
se_tpg, (unsigned char *)name);
|
|
if (!tv_nexus->tvn_se_sess->se_node_acl) {
|
|
mutex_unlock(&tv_tpg->tv_tpg_mutex);
|
|
pr_debug("core_tpg_check_initiator_node_acl() failed"
|
|
" for %s\n", name);
|
|
transport_free_session(tv_nexus->tvn_se_sess);
|
|
kfree(tv_nexus);
|
|
return -ENOMEM;
|
|
}
|
|
/*
|
|
* Now register the TCM vHost virtual I_T Nexus as active with the
|
|
* call to __transport_register_session()
|
|
*/
|
|
__transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
|
|
tv_nexus->tvn_se_sess, tv_nexus);
|
|
tv_tpg->tpg_nexus = tv_nexus;
|
|
|
|
mutex_unlock(&tv_tpg->tv_tpg_mutex);
|
|
return 0;
|
|
}
|
|
|
|
static int tcm_vhost_drop_nexus(
|
|
struct tcm_vhost_tpg *tpg)
|
|
{
|
|
struct se_session *se_sess;
|
|
struct tcm_vhost_nexus *tv_nexus;
|
|
|
|
mutex_lock(&tpg->tv_tpg_mutex);
|
|
tv_nexus = tpg->tpg_nexus;
|
|
if (!tv_nexus) {
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
return -ENODEV;
|
|
}
|
|
|
|
se_sess = tv_nexus->tvn_se_sess;
|
|
if (!se_sess) {
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (atomic_read(&tpg->tv_tpg_port_count)) {
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
pr_err("Unable to remove TCM_vHost I_T Nexus with"
|
|
" active TPG port count: %d\n",
|
|
atomic_read(&tpg->tv_tpg_port_count));
|
|
return -EPERM;
|
|
}
|
|
|
|
if (atomic_read(&tpg->tv_tpg_vhost_count)) {
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
pr_err("Unable to remove TCM_vHost I_T Nexus with"
|
|
" active TPG vhost count: %d\n",
|
|
atomic_read(&tpg->tv_tpg_vhost_count));
|
|
return -EPERM;
|
|
}
|
|
|
|
pr_debug("TCM_vHost_ConfigFS: Removing I_T Nexus to emulated"
|
|
" %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport),
|
|
tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
|
|
/*
|
|
* Release the SCSI I_T Nexus to the emulated vHost Target Port
|
|
*/
|
|
transport_deregister_session(tv_nexus->tvn_se_sess);
|
|
tpg->tpg_nexus = NULL;
|
|
mutex_unlock(&tpg->tv_tpg_mutex);
|
|
|
|
kfree(tv_nexus);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t tcm_vhost_tpg_show_nexus(
|
|
struct se_portal_group *se_tpg,
|
|
char *page)
|
|
{
|
|
struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
|
|
struct tcm_vhost_tpg, se_tpg);
|
|
struct tcm_vhost_nexus *tv_nexus;
|
|
ssize_t ret;
|
|
|
|
mutex_lock(&tv_tpg->tv_tpg_mutex);
|
|
tv_nexus = tv_tpg->tpg_nexus;
|
|
if (!tv_nexus) {
|
|
mutex_unlock(&tv_tpg->tv_tpg_mutex);
|
|
return -ENODEV;
|
|
}
|
|
ret = snprintf(page, PAGE_SIZE, "%s\n",
|
|
tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
|
|
mutex_unlock(&tv_tpg->tv_tpg_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t tcm_vhost_tpg_store_nexus(
|
|
struct se_portal_group *se_tpg,
|
|
const char *page,
|
|
size_t count)
|
|
{
|
|
struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
|
|
struct tcm_vhost_tpg, se_tpg);
|
|
struct tcm_vhost_tport *tport_wwn = tv_tpg->tport;
|
|
unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr;
|
|
int ret;
|
|
/*
|
|
* Shutdown the active I_T nexus if 'NULL' is passed..
|
|
*/
|
|
if (!strncmp(page, "NULL", 4)) {
|
|
ret = tcm_vhost_drop_nexus(tv_tpg);
|
|
return (!ret) ? count : ret;
|
|
}
|
|
/*
|
|
* Otherwise make sure the passed virtual Initiator port WWN matches
|
|
* the fabric protocol_id set in tcm_vhost_make_tport(), and call
|
|
* tcm_vhost_make_nexus().
|
|
*/
|
|
if (strlen(page) >= TCM_VHOST_NAMELEN) {
|
|
pr_err("Emulated NAA Sas Address: %s, exceeds"
|
|
" max: %d\n", page, TCM_VHOST_NAMELEN);
|
|
return -EINVAL;
|
|
}
|
|
snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page);
|
|
|
|
ptr = strstr(i_port, "naa.");
|
|
if (ptr) {
|
|
if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
|
|
pr_err("Passed SAS Initiator Port %s does not"
|
|
" match target port protoid: %s\n", i_port,
|
|
tcm_vhost_dump_proto_id(tport_wwn));
|
|
return -EINVAL;
|
|
}
|
|
port_ptr = &i_port[0];
|
|
goto check_newline;
|
|
}
|
|
ptr = strstr(i_port, "fc.");
|
|
if (ptr) {
|
|
if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
|
|
pr_err("Passed FCP Initiator Port %s does not"
|
|
" match target port protoid: %s\n", i_port,
|
|
tcm_vhost_dump_proto_id(tport_wwn));
|
|
return -EINVAL;
|
|
}
|
|
port_ptr = &i_port[3]; /* Skip over "fc." */
|
|
goto check_newline;
|
|
}
|
|
ptr = strstr(i_port, "iqn.");
|
|
if (ptr) {
|
|
if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
|
|
pr_err("Passed iSCSI Initiator Port %s does not"
|
|
" match target port protoid: %s\n", i_port,
|
|
tcm_vhost_dump_proto_id(tport_wwn));
|
|
return -EINVAL;
|
|
}
|
|
port_ptr = &i_port[0];
|
|
goto check_newline;
|
|
}
|
|
pr_err("Unable to locate prefix for emulated Initiator Port:"
|
|
" %s\n", i_port);
|
|
return -EINVAL;
|
|
/*
|
|
* Clear any trailing newline for the NAA WWN
|
|
*/
|
|
check_newline:
|
|
if (i_port[strlen(i_port)-1] == '\n')
|
|
i_port[strlen(i_port)-1] = '\0';
|
|
|
|
ret = tcm_vhost_make_nexus(tv_tpg, port_ptr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return count;
|
|
}
|
|
|
|
TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR);
|
|
|
|
static struct configfs_attribute *tcm_vhost_tpg_attrs[] = {
|
|
&tcm_vhost_tpg_nexus.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct se_portal_group *tcm_vhost_make_tpg(
|
|
struct se_wwn *wwn,
|
|
struct config_group *group,
|
|
const char *name)
|
|
{
|
|
struct tcm_vhost_tport *tport = container_of(wwn,
|
|
struct tcm_vhost_tport, tport_wwn);
|
|
|
|
struct tcm_vhost_tpg *tpg;
|
|
unsigned long tpgt;
|
|
int ret;
|
|
|
|
if (strstr(name, "tpgt_") != name)
|
|
return ERR_PTR(-EINVAL);
|
|
if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL);
|
|
if (!tpg) {
|
|
pr_err("Unable to allocate struct tcm_vhost_tpg");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
mutex_init(&tpg->tv_tpg_mutex);
|
|
INIT_LIST_HEAD(&tpg->tv_tpg_list);
|
|
tpg->tport = tport;
|
|
tpg->tport_tpgt = tpgt;
|
|
|
|
ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn,
|
|
&tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
|
|
if (ret < 0) {
|
|
kfree(tpg);
|
|
return NULL;
|
|
}
|
|
mutex_lock(&tcm_vhost_mutex);
|
|
list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list);
|
|
mutex_unlock(&tcm_vhost_mutex);
|
|
|
|
return &tpg->se_tpg;
|
|
}
|
|
|
|
static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg)
|
|
{
|
|
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
|
|
struct tcm_vhost_tpg, se_tpg);
|
|
|
|
mutex_lock(&tcm_vhost_mutex);
|
|
list_del(&tpg->tv_tpg_list);
|
|
mutex_unlock(&tcm_vhost_mutex);
|
|
/*
|
|
* Release the virtual I_T Nexus for this vHost TPG
|
|
*/
|
|
tcm_vhost_drop_nexus(tpg);
|
|
/*
|
|
* Deregister the se_tpg from TCM..
|
|
*/
|
|
core_tpg_deregister(se_tpg);
|
|
kfree(tpg);
|
|
}
|
|
|
|
static struct se_wwn *tcm_vhost_make_tport(
|
|
struct target_fabric_configfs *tf,
|
|
struct config_group *group,
|
|
const char *name)
|
|
{
|
|
struct tcm_vhost_tport *tport;
|
|
char *ptr;
|
|
u64 wwpn = 0;
|
|
int off = 0;
|
|
|
|
/* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
|
|
return ERR_PTR(-EINVAL); */
|
|
|
|
tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL);
|
|
if (!tport) {
|
|
pr_err("Unable to allocate struct tcm_vhost_tport");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
tport->tport_wwpn = wwpn;
|
|
/*
|
|
* Determine the emulated Protocol Identifier and Target Port Name
|
|
* based on the incoming configfs directory name.
|
|
*/
|
|
ptr = strstr(name, "naa.");
|
|
if (ptr) {
|
|
tport->tport_proto_id = SCSI_PROTOCOL_SAS;
|
|
goto check_len;
|
|
}
|
|
ptr = strstr(name, "fc.");
|
|
if (ptr) {
|
|
tport->tport_proto_id = SCSI_PROTOCOL_FCP;
|
|
off = 3; /* Skip over "fc." */
|
|
goto check_len;
|
|
}
|
|
ptr = strstr(name, "iqn.");
|
|
if (ptr) {
|
|
tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
|
|
goto check_len;
|
|
}
|
|
|
|
pr_err("Unable to locate prefix for emulated Target Port:"
|
|
" %s\n", name);
|
|
kfree(tport);
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
check_len:
|
|
if (strlen(name) >= TCM_VHOST_NAMELEN) {
|
|
pr_err("Emulated %s Address: %s, exceeds"
|
|
" max: %d\n", name, tcm_vhost_dump_proto_id(tport),
|
|
TCM_VHOST_NAMELEN);
|
|
kfree(tport);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]);
|
|
|
|
pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
|
|
" %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name);
|
|
|
|
return &tport->tport_wwn;
|
|
}
|
|
|
|
static void tcm_vhost_drop_tport(struct se_wwn *wwn)
|
|
{
|
|
struct tcm_vhost_tport *tport = container_of(wwn,
|
|
struct tcm_vhost_tport, tport_wwn);
|
|
|
|
pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
|
|
" %s Address: %s\n", tcm_vhost_dump_proto_id(tport),
|
|
tport->tport_name);
|
|
|
|
kfree(tport);
|
|
}
|
|
|
|
static ssize_t tcm_vhost_wwn_show_attr_version(
|
|
struct target_fabric_configfs *tf,
|
|
char *page)
|
|
{
|
|
return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
|
|
"on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
|
|
utsname()->machine);
|
|
}
|
|
|
|
TF_WWN_ATTR_RO(tcm_vhost, version);
|
|
|
|
static struct configfs_attribute *tcm_vhost_wwn_attrs[] = {
|
|
&tcm_vhost_wwn_version.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct target_core_fabric_ops tcm_vhost_ops = {
|
|
.get_fabric_name = tcm_vhost_get_fabric_name,
|
|
.get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident,
|
|
.tpg_get_wwn = tcm_vhost_get_fabric_wwn,
|
|
.tpg_get_tag = tcm_vhost_get_tag,
|
|
.tpg_get_default_depth = tcm_vhost_get_default_depth,
|
|
.tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id,
|
|
.tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len,
|
|
.tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id,
|
|
.tpg_check_demo_mode = tcm_vhost_check_true,
|
|
.tpg_check_demo_mode_cache = tcm_vhost_check_true,
|
|
.tpg_check_demo_mode_write_protect = tcm_vhost_check_false,
|
|
.tpg_check_prod_mode_write_protect = tcm_vhost_check_false,
|
|
.tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl,
|
|
.tpg_release_fabric_acl = tcm_vhost_release_fabric_acl,
|
|
.tpg_get_inst_index = tcm_vhost_tpg_get_inst_index,
|
|
.release_cmd = tcm_vhost_release_cmd,
|
|
.shutdown_session = tcm_vhost_shutdown_session,
|
|
.close_session = tcm_vhost_close_session,
|
|
.sess_get_index = tcm_vhost_sess_get_index,
|
|
.sess_get_initiator_sid = NULL,
|
|
.write_pending = tcm_vhost_write_pending,
|
|
.write_pending_status = tcm_vhost_write_pending_status,
|
|
.set_default_node_attributes = tcm_vhost_set_default_node_attrs,
|
|
.get_task_tag = tcm_vhost_get_task_tag,
|
|
.get_cmd_state = tcm_vhost_get_cmd_state,
|
|
.queue_data_in = tcm_vhost_queue_data_in,
|
|
.queue_status = tcm_vhost_queue_status,
|
|
.queue_tm_rsp = tcm_vhost_queue_tm_rsp,
|
|
.get_fabric_sense_len = tcm_vhost_get_fabric_sense_len,
|
|
.set_fabric_sense_len = tcm_vhost_set_fabric_sense_len,
|
|
/*
|
|
* Setup callers for generic logic in target_core_fabric_configfs.c
|
|
*/
|
|
.fabric_make_wwn = tcm_vhost_make_tport,
|
|
.fabric_drop_wwn = tcm_vhost_drop_tport,
|
|
.fabric_make_tpg = tcm_vhost_make_tpg,
|
|
.fabric_drop_tpg = tcm_vhost_drop_tpg,
|
|
.fabric_post_link = tcm_vhost_port_link,
|
|
.fabric_pre_unlink = tcm_vhost_port_unlink,
|
|
.fabric_make_np = NULL,
|
|
.fabric_drop_np = NULL,
|
|
.fabric_make_nodeacl = tcm_vhost_make_nodeacl,
|
|
.fabric_drop_nodeacl = tcm_vhost_drop_nodeacl,
|
|
};
|
|
|
|
static int tcm_vhost_register_configfs(void)
|
|
{
|
|
struct target_fabric_configfs *fabric;
|
|
int ret;
|
|
|
|
pr_debug("TCM_VHOST fabric module %s on %s/%s"
|
|
" on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
|
|
utsname()->machine);
|
|
/*
|
|
* Register the top level struct config_item_type with TCM core
|
|
*/
|
|
fabric = target_fabric_configfs_init(THIS_MODULE, "vhost");
|
|
if (IS_ERR(fabric)) {
|
|
pr_err("target_fabric_configfs_init() failed\n");
|
|
return PTR_ERR(fabric);
|
|
}
|
|
/*
|
|
* Setup fabric->tf_ops from our local tcm_vhost_ops
|
|
*/
|
|
fabric->tf_ops = tcm_vhost_ops;
|
|
/*
|
|
* Setup default attribute lists for various fabric->tf_cit_tmpl
|
|
*/
|
|
TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs;
|
|
TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs;
|
|
TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
|
|
TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
|
|
TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
|
|
TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
|
|
TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
|
|
TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
|
|
TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
|
|
/*
|
|
* Register the fabric for use within TCM
|
|
*/
|
|
ret = target_fabric_configfs_register(fabric);
|
|
if (ret < 0) {
|
|
pr_err("target_fabric_configfs_register() failed"
|
|
" for TCM_VHOST\n");
|
|
return ret;
|
|
}
|
|
/*
|
|
* Setup our local pointer to *fabric
|
|
*/
|
|
tcm_vhost_fabric_configfs = fabric;
|
|
pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n");
|
|
return 0;
|
|
};
|
|
|
|
static void tcm_vhost_deregister_configfs(void)
|
|
{
|
|
if (!tcm_vhost_fabric_configfs)
|
|
return;
|
|
|
|
target_fabric_configfs_deregister(tcm_vhost_fabric_configfs);
|
|
tcm_vhost_fabric_configfs = NULL;
|
|
pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n");
|
|
};
|
|
|
|
static int __init tcm_vhost_init(void)
|
|
{
|
|
int ret = -ENOMEM;
|
|
|
|
tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0);
|
|
if (!tcm_vhost_workqueue)
|
|
goto out;
|
|
|
|
ret = vhost_scsi_register();
|
|
if (ret < 0)
|
|
goto out_destroy_workqueue;
|
|
|
|
ret = tcm_vhost_register_configfs();
|
|
if (ret < 0)
|
|
goto out_vhost_scsi_deregister;
|
|
|
|
return 0;
|
|
|
|
out_vhost_scsi_deregister:
|
|
vhost_scsi_deregister();
|
|
out_destroy_workqueue:
|
|
destroy_workqueue(tcm_vhost_workqueue);
|
|
out:
|
|
return ret;
|
|
};
|
|
|
|
static void tcm_vhost_exit(void)
|
|
{
|
|
tcm_vhost_deregister_configfs();
|
|
vhost_scsi_deregister();
|
|
destroy_workqueue(tcm_vhost_workqueue);
|
|
};
|
|
|
|
MODULE_DESCRIPTION("TCM_VHOST series fabric driver");
|
|
MODULE_LICENSE("GPL");
|
|
module_init(tcm_vhost_init);
|
|
module_exit(tcm_vhost_exit);
|