linux/drivers/vhost/scsi.c
Linus Torvalds a030cbc350 vhost: more fixes for 3.11
This includes some fixes for vhost net and scsi drivers.
 The test module has already been reworked to avoid rcu
 usage, but the necessary core changes are missing,
 we fixed this.
 Unlikely to affect any real-world users, but it's
 early in the cycle so, let's merge them.
 
 Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

Pull vhost fixes from Michael Tsirkin:
 "vhost: more fixes for 3.11

  This includes some fixes for vhost net and scsi drivers.

  The test module has already been reworked to avoid rcu usage, but the
  necessary core changes are missing, we fixed this.

  Unlikely to affect any real-world users, but it's early in the cycle
  so, let's merge them"

(It was earlier when Michael originally sent the email, but it somehot
got missed in the flood, so here it is after -rc2)

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  vhost: Remove custom vhost rcu usage
  vhost-scsi: Always access vq->private_data under vq mutex
  vhost-net: Always access vq->private_data under vq mutex
2013-07-23 14:38:20 -07:00

2160 lines
56 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/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_scsi.h>
#include <linux/llist.h>
#include <linux/bitmap.h>
#include "vhost.h"
#define TCM_VHOST_VERSION "v0.1"
#define TCM_VHOST_NAMELEN 256
#define TCM_VHOST_MAX_CDB_SIZE 32
struct vhost_scsi_inflight {
/* Wait for the flush operation to finish */
struct completion comp;
/* Refcount for the inflight reqs */
struct kref kref;
};
struct tcm_vhost_cmd {
/* Descriptor from vhost_get_vq_desc() for virt_queue segment */
int tvc_vq_desc;
/* virtio-scsi initiator task attribute */
int tvc_task_attr;
/* virtio-scsi initiator data direction */
enum dma_data_direction tvc_data_direction;
/* Expected data transfer length from virtio-scsi header */
u32 tvc_exp_data_len;
/* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
u64 tvc_tag;
/* The number of scatterlists associated with this cmd */
u32 tvc_sgl_count;
/* Saved unpacked SCSI LUN for tcm_vhost_submission_work() */
u32 tvc_lun;
/* Pointer to the SGL formatted memory from virtio-scsi */
struct scatterlist *tvc_sgl;
/* Pointer to response */
struct virtio_scsi_cmd_resp __user *tvc_resp;
/* Pointer to vhost_scsi for our device */
struct vhost_scsi *tvc_vhost;
/* Pointer to vhost_virtqueue for the cmd */
struct vhost_virtqueue *tvc_vq;
/* Pointer to vhost nexus memory */
struct tcm_vhost_nexus *tvc_nexus;
/* The TCM I/O descriptor that is accessed via container_of() */
struct se_cmd tvc_se_cmd;
/* work item used for cmwq dispatch to tcm_vhost_submission_work() */
struct work_struct work;
/* Copy of the incoming SCSI command descriptor block (CDB) */
unsigned char tvc_cdb[TCM_VHOST_MAX_CDB_SIZE];
/* Sense buffer that will be mapped into outgoing status */
unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
/* Completed commands list, serviced from vhost worker thread */
struct llist_node tvc_completion_list;
/* Used to track inflight cmd */
struct vhost_scsi_inflight *inflight;
};
struct tcm_vhost_nexus {
/* Pointer to TCM session for I_T Nexus */
struct se_session *tvn_se_sess;
};
struct tcm_vhost_nacl {
/* Binary World Wide unique Port Name for Vhost Initiator port */
u64 iport_wwpn;
/* ASCII formatted WWPN for Sas Initiator port */
char iport_name[TCM_VHOST_NAMELEN];
/* Returned by tcm_vhost_make_nodeacl() */
struct se_node_acl se_node_acl;
};
struct tcm_vhost_tpg {
/* Vhost port target portal group tag for TCM */
u16 tport_tpgt;
/* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
int tv_tpg_port_count;
/* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
int tv_tpg_vhost_count;
/* list for tcm_vhost_list */
struct list_head tv_tpg_list;
/* Used to protect access for tpg_nexus */
struct mutex tv_tpg_mutex;
/* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
struct tcm_vhost_nexus *tpg_nexus;
/* Pointer back to tcm_vhost_tport */
struct tcm_vhost_tport *tport;
/* Returned by tcm_vhost_make_tpg() */
struct se_portal_group se_tpg;
/* Pointer back to vhost_scsi, protected by tv_tpg_mutex */
struct vhost_scsi *vhost_scsi;
};
struct tcm_vhost_tport {
/* SCSI protocol the tport is providing */
u8 tport_proto_id;
/* Binary World Wide unique Port Name for Vhost Target port */
u64 tport_wwpn;
/* ASCII formatted WWPN for Vhost Target port */
char tport_name[TCM_VHOST_NAMELEN];
/* Returned by tcm_vhost_make_tport() */
struct se_wwn tport_wwn;
};
struct tcm_vhost_evt {
/* event to be sent to guest */
struct virtio_scsi_event event;
/* event list, serviced from vhost worker thread */
struct llist_node list;
};
enum {
VHOST_SCSI_VQ_CTL = 0,
VHOST_SCSI_VQ_EVT = 1,
VHOST_SCSI_VQ_IO = 2,
};
enum {
VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG)
};
#define VHOST_SCSI_MAX_TARGET 256
#define VHOST_SCSI_MAX_VQ 128
#define VHOST_SCSI_MAX_EVENT 128
struct vhost_scsi_virtqueue {
struct vhost_virtqueue vq;
/*
* Reference counting for inflight reqs, used for flush operation. At
* each time, one reference tracks new commands submitted, while we
* wait for another one to reach 0.
*/
struct vhost_scsi_inflight inflights[2];
/*
* Indicate current inflight in use, protected by vq->mutex.
* Writers must also take dev mutex and flush under it.
*/
int inflight_idx;
};
struct vhost_scsi {
/* Protected by vhost_scsi->dev.mutex */
struct tcm_vhost_tpg **vs_tpg;
char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
struct vhost_dev dev;
struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ];
struct vhost_work vs_completion_work; /* cmd completion work item */
struct llist_head vs_completion_list; /* cmd completion queue */
struct vhost_work vs_event_work; /* evt injection work item */
struct llist_head vs_event_list; /* evt injection queue */
bool vs_events_missed; /* any missed events, protected by vq->mutex */
int vs_events_nr; /* num of pending events, protected by vq->mutex */
};
/* 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 iov_num_pages(struct iovec *iov)
{
return (PAGE_ALIGN((unsigned long)iov->iov_base + iov->iov_len) -
((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT;
}
static void tcm_vhost_done_inflight(struct kref *kref)
{
struct vhost_scsi_inflight *inflight;
inflight = container_of(kref, struct vhost_scsi_inflight, kref);
complete(&inflight->comp);
}
static void tcm_vhost_init_inflight(struct vhost_scsi *vs,
struct vhost_scsi_inflight *old_inflight[])
{
struct vhost_scsi_inflight *new_inflight;
struct vhost_virtqueue *vq;
int idx, i;
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
vq = &vs->vqs[i].vq;
mutex_lock(&vq->mutex);
/* store old infight */
idx = vs->vqs[i].inflight_idx;
if (old_inflight)
old_inflight[i] = &vs->vqs[i].inflights[idx];
/* setup new infight */
vs->vqs[i].inflight_idx = idx ^ 1;
new_inflight = &vs->vqs[i].inflights[idx ^ 1];
kref_init(&new_inflight->kref);
init_completion(&new_inflight->comp);
mutex_unlock(&vq->mutex);
}
}
static struct vhost_scsi_inflight *
tcm_vhost_get_inflight(struct vhost_virtqueue *vq)
{
struct vhost_scsi_inflight *inflight;
struct vhost_scsi_virtqueue *svq;
svq = container_of(vq, struct vhost_scsi_virtqueue, vq);
inflight = &svq->inflights[svq->inflight_idx];
kref_get(&inflight->kref);
return inflight;
}
static void tcm_vhost_put_inflight(struct vhost_scsi_inflight *inflight)
{
kref_put(&inflight->kref, tcm_vhost_done_inflight);
}
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 allocate 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)
{
struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
struct tcm_vhost_cmd, tvc_se_cmd);
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);
}
tcm_vhost_put_inflight(tv_cmd->inflight);
kfree(tv_cmd);
}
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 *cmd)
{
struct vhost_scsi *vs = cmd->tvc_vhost;
llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);
vhost_work_queue(&vs->dev, &vs->vs_completion_work);
}
static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd)
{
struct tcm_vhost_cmd *cmd = container_of(se_cmd,
struct tcm_vhost_cmd, tvc_se_cmd);
vhost_scsi_complete_cmd(cmd);
return 0;
}
static int tcm_vhost_queue_status(struct se_cmd *se_cmd)
{
struct tcm_vhost_cmd *cmd = container_of(se_cmd,
struct tcm_vhost_cmd, tvc_se_cmd);
vhost_scsi_complete_cmd(cmd);
return 0;
}
static void tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd)
{
return;
}
static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt)
{
vs->vs_events_nr--;
kfree(evt);
}
static struct tcm_vhost_evt *
tcm_vhost_allocate_evt(struct vhost_scsi *vs,
u32 event, u32 reason)
{
struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
struct tcm_vhost_evt *evt;
if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
vs->vs_events_missed = true;
return NULL;
}
evt = kzalloc(sizeof(*evt), GFP_KERNEL);
if (!evt) {
vq_err(vq, "Failed to allocate tcm_vhost_evt\n");
vs->vs_events_missed = true;
return NULL;
}
evt->event.event = event;
evt->event.reason = reason;
vs->vs_events_nr++;
return evt;
}
static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *cmd)
{
struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
/* TODO locking against target/backend threads? */
transport_generic_free_cmd(se_cmd, 0);
}
static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
{
return target_put_sess_cmd(se_cmd->se_sess, se_cmd);
}
static void
tcm_vhost_do_evt_work(struct vhost_scsi *vs, struct tcm_vhost_evt *evt)
{
struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
struct virtio_scsi_event *event = &evt->event;
struct virtio_scsi_event __user *eventp;
unsigned out, in;
int head, ret;
if (!vq->private_data) {
vs->vs_events_missed = true;
return;
}
again:
vhost_disable_notify(&vs->dev, vq);
head = vhost_get_vq_desc(&vs->dev, vq, vq->iov,
ARRAY_SIZE(vq->iov), &out, &in,
NULL, NULL);
if (head < 0) {
vs->vs_events_missed = true;
return;
}
if (head == vq->num) {
if (vhost_enable_notify(&vs->dev, vq))
goto again;
vs->vs_events_missed = true;
return;
}
if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
vq->iov[out].iov_len);
vs->vs_events_missed = true;
return;
}
if (vs->vs_events_missed) {
event->event |= VIRTIO_SCSI_T_EVENTS_MISSED;
vs->vs_events_missed = false;
}
eventp = vq->iov[out].iov_base;
ret = __copy_to_user(eventp, event, sizeof(*event));
if (!ret)
vhost_add_used_and_signal(&vs->dev, vq, head, 0);
else
vq_err(vq, "Faulted on tcm_vhost_send_event\n");
}
static void tcm_vhost_evt_work(struct vhost_work *work)
{
struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
vs_event_work);
struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
struct tcm_vhost_evt *evt;
struct llist_node *llnode;
mutex_lock(&vq->mutex);
llnode = llist_del_all(&vs->vs_event_list);
while (llnode) {
evt = llist_entry(llnode, struct tcm_vhost_evt, list);
llnode = llist_next(llnode);
tcm_vhost_do_evt_work(vs, evt);
tcm_vhost_free_evt(vs, evt);
}
mutex_unlock(&vq->mutex);
}
/* 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);
DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
struct virtio_scsi_cmd_resp v_rsp;
struct tcm_vhost_cmd *cmd;
struct llist_node *llnode;
struct se_cmd *se_cmd;
int ret, vq;
bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
llnode = llist_del_all(&vs->vs_completion_list);
while (llnode) {
cmd = llist_entry(llnode, struct tcm_vhost_cmd,
tvc_completion_list);
llnode = llist_next(llnode);
se_cmd = &cmd->tvc_se_cmd;
pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
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, cmd->tvc_sense_buf,
v_rsp.sense_len);
ret = copy_to_user(cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
if (likely(ret == 0)) {
struct vhost_scsi_virtqueue *q;
vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
vq = q - vs->vqs;
__set_bit(vq, signal);
} else
pr_err("Faulted on virtio_scsi_cmd_resp\n");
vhost_scsi_free_cmd(cmd);
}
vq = -1;
while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
< VHOST_SCSI_MAX_VQ)
vhost_signal(&vs->dev, &vs->vqs[vq].vq);
}
static struct tcm_vhost_cmd *
vhost_scsi_allocate_cmd(struct vhost_virtqueue *vq,
struct tcm_vhost_tpg *tpg,
struct virtio_scsi_cmd_req *v_req,
u32 exp_data_len,
int data_direction)
{
struct tcm_vhost_cmd *cmd;
struct tcm_vhost_nexus *tv_nexus;
tv_nexus = tpg->tpg_nexus;
if (!tv_nexus) {
pr_err("Unable to locate active struct tcm_vhost_nexus\n");
return ERR_PTR(-EIO);
}
cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC);
if (!cmd) {
pr_err("Unable to allocate struct tcm_vhost_cmd\n");
return ERR_PTR(-ENOMEM);
}
cmd->tvc_tag = v_req->tag;
cmd->tvc_task_attr = v_req->task_attr;
cmd->tvc_exp_data_len = exp_data_len;
cmd->tvc_data_direction = data_direction;
cmd->tvc_nexus = tv_nexus;
cmd->inflight = tcm_vhost_get_inflight(vq);
return 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,
struct iovec *iov,
int write)
{
unsigned int npages = 0, pages_nr, offset, nbytes;
struct scatterlist *sg = sgl;
void __user *ptr = iov->iov_base;
size_t len = iov->iov_len;
struct page **pages;
int ret, i;
pages_nr = iov_num_pages(iov);
if (pages_nr > sgl_count)
return -ENOBUFS;
pages = kmalloc(pages_nr * sizeof(struct page *), GFP_KERNEL);
if (!pages)
return -ENOMEM;
ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
/* No pages were pinned */
if (ret < 0)
goto out;
/* Less pages pinned than wanted */
if (ret != pages_nr) {
for (i = 0; i < ret; i++)
put_page(pages[i]);
ret = -EFAULT;
goto out;
}
while (len > 0) {
offset = (uintptr_t)ptr & ~PAGE_MASK;
nbytes = min_t(unsigned int, PAGE_SIZE - offset, len);
sg_set_page(sg, pages[npages], nbytes, offset);
ptr += nbytes;
len -= nbytes;
sg++;
npages++;
}
out:
kfree(pages);
return ret;
}
static int
vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *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 += iov_num_pages(&iov[i]);
/* TODO overflow checking */
sg = kmalloc(sizeof(cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC);
if (!sg)
return -ENOMEM;
pr_debug("%s sg %p sgl_count %u is_err %d\n", __func__,
sg, sgl_count, !sg);
sg_init_table(sg, sgl_count);
cmd->tvc_sgl = sg;
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], write);
if (ret < 0) {
for (i = 0; i < cmd->tvc_sgl_count; i++)
put_page(sg_page(&cmd->tvc_sgl[i]));
kfree(cmd->tvc_sgl);
cmd->tvc_sgl = NULL;
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 *cmd =
container_of(work, struct tcm_vhost_cmd, work);
struct tcm_vhost_nexus *tv_nexus;
struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL;
int rc, sg_no_bidi = 0;
if (cmd->tvc_sgl_count) {
sg_ptr = cmd->tvc_sgl;
/* 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;
}
tv_nexus = cmd->tvc_nexus;
rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
cmd->tvc_cdb, &cmd->tvc_sense_buf[0],
cmd->tvc_lun, cmd->tvc_exp_data_len,
cmd->tvc_task_attr, cmd->tvc_data_direction,
TARGET_SCF_ACK_KREF, sg_ptr, cmd->tvc_sgl_count,
sg_bidi_ptr, sg_no_bidi);
if (rc < 0) {
transport_send_check_condition_and_sense(se_cmd,
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
transport_generic_free_cmd(se_cmd, 0);
}
}
static void
vhost_scsi_send_bad_target(struct vhost_scsi *vs,
struct vhost_virtqueue *vq,
int head, unsigned out)
{
struct virtio_scsi_cmd_resp __user *resp;
struct virtio_scsi_cmd_resp rsp;
int ret;
memset(&rsp, 0, sizeof(rsp));
rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
resp = vq->iov[out].iov_base;
ret = __copy_to_user(resp, &rsp, sizeof(rsp));
if (!ret)
vhost_add_used_and_signal(&vs->dev, vq, head, 0);
else
pr_err("Faulted on virtio_scsi_cmd_resp\n");
}
static void
vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
{
struct tcm_vhost_tpg **vs_tpg;
struct virtio_scsi_cmd_req v_req;
struct tcm_vhost_tpg *tpg;
struct tcm_vhost_cmd *cmd;
u32 exp_data_len, data_first, data_num, data_direction;
unsigned out, in, i;
int head, ret;
u8 target;
mutex_lock(&vq->mutex);
/*
* We can handle the vq only after the endpoint is setup by calling the
* VHOST_SCSI_SET_ENDPOINT ioctl.
*/
vs_tpg = vq->private_data;
if (!vs_tpg)
goto out;
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;
}
/* Extract the tpgt */
target = v_req.lun[1];
tpg = ACCESS_ONCE(vs_tpg[target]);
/* Target does not exist, fail the request */
if (unlikely(!tpg)) {
vhost_scsi_send_bad_target(vs, vq, head, out);
continue;
}
exp_data_len = 0;
for (i = 0; i < data_num; i++)
exp_data_len += vq->iov[data_first + i].iov_len;
cmd = vhost_scsi_allocate_cmd(vq, tpg, &v_req,
exp_data_len, data_direction);
if (IS_ERR(cmd)) {
vq_err(vq, "vhost_scsi_allocate_cmd failed %ld\n",
PTR_ERR(cmd));
goto err_cmd;
}
pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
": %d\n", cmd, exp_data_len, data_direction);
cmd->tvc_vhost = vs;
cmd->tvc_vq = vq;
cmd->tvc_resp = vq->iov[out].iov_base;
/*
* Copy in the recieved CDB descriptor into cmd->tvc_cdb
* that will be used by tcm_vhost_new_cmd_map() and down into
* target_setup_cmd_from_cdb()
*/
memcpy(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(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(cmd->tvc_cdb),
TCM_VHOST_MAX_CDB_SIZE);
goto err_free;
}
cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
cmd->tvc_cdb[0], cmd->tvc_lun);
if (data_direction != DMA_NONE) {
ret = vhost_scsi_map_iov_to_sgl(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");
goto err_free;
}
}
/*
* 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()
*/
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(&cmd->work, tcm_vhost_submission_work);
queue_work(tcm_vhost_workqueue, &cmd->work);
}
mutex_unlock(&vq->mutex);
return;
err_free:
vhost_scsi_free_cmd(cmd);
err_cmd:
vhost_scsi_send_bad_target(vs, vq, head, out);
out:
mutex_unlock(&vq->mutex);
}
static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
{
pr_debug("%s: The handling func for control queue.\n", __func__);
}
static void
tcm_vhost_send_evt(struct vhost_scsi *vs,
struct tcm_vhost_tpg *tpg,
struct se_lun *lun,
u32 event,
u32 reason)
{
struct tcm_vhost_evt *evt;
evt = tcm_vhost_allocate_evt(vs, event, reason);
if (!evt)
return;
if (tpg && lun) {
/* TODO: share lun setup code with virtio-scsi.ko */
/*
* Note: evt->event is zeroed when we allocate it and
* lun[4-7] need to be zero according to virtio-scsi spec.
*/
evt->event.lun[0] = 0x01;
evt->event.lun[1] = tpg->tport_tpgt & 0xFF;
if (lun->unpacked_lun >= 256)
evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
evt->event.lun[3] = lun->unpacked_lun & 0xFF;
}
llist_add(&evt->list, &vs->vs_event_list);
vhost_work_queue(&vs->dev, &vs->vs_event_work);
}
static void vhost_scsi_evt_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);
mutex_lock(&vq->mutex);
if (!vq->private_data)
goto out;
if (vs->vs_events_missed)
tcm_vhost_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
out:
mutex_unlock(&vq->mutex);
}
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, vq);
}
static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
{
vhost_poll_flush(&vs->vqs[index].vq.poll);
}
/* Callers must hold dev mutex */
static void vhost_scsi_flush(struct vhost_scsi *vs)
{
struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];
int i;
/* Init new inflight and remember the old inflight */
tcm_vhost_init_inflight(vs, old_inflight);
/*
* The inflight->kref was initialized to 1. We decrement it here to
* indicate the start of the flush operation so that it will reach 0
* when all the reqs are finished.
*/
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
kref_put(&old_inflight[i]->kref, tcm_vhost_done_inflight);
/* Flush both the vhost poll and vhost work */
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
vhost_scsi_flush_vq(vs, i);
vhost_work_flush(&vs->dev, &vs->vs_completion_work);
vhost_work_flush(&vs->dev, &vs->vs_event_work);
/* Wait for all reqs issued before the flush to be finished */
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
wait_for_completion(&old_inflight[i]->comp);
}
/*
* Called from vhost_scsi_ioctl() context to walk the list of available
* tcm_vhost_tpg with an active struct tcm_vhost_nexus
*
* The lock nesting rule is:
* tcm_vhost_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
*/
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 *tpg;
struct tcm_vhost_tpg **vs_tpg;
struct vhost_virtqueue *vq;
int index, ret, i, len;
bool match = false;
mutex_lock(&tcm_vhost_mutex);
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].vq)) {
ret = -EFAULT;
goto out;
}
}
len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
vs_tpg = kzalloc(len, GFP_KERNEL);
if (!vs_tpg) {
ret = -ENOMEM;
goto out;
}
if (vs->vs_tpg)
memcpy(vs_tpg, vs->vs_tpg, len);
list_for_each_entry(tpg, &tcm_vhost_list, tv_tpg_list) {
mutex_lock(&tpg->tv_tpg_mutex);
if (!tpg->tpg_nexus) {
mutex_unlock(&tpg->tv_tpg_mutex);
continue;
}
if (tpg->tv_tpg_vhost_count != 0) {
mutex_unlock(&tpg->tv_tpg_mutex);
continue;
}
tv_tport = tpg->tport;
if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
kfree(vs_tpg);
mutex_unlock(&tpg->tv_tpg_mutex);
ret = -EEXIST;
goto out;
}
tpg->tv_tpg_vhost_count++;
tpg->vhost_scsi = vs;
vs_tpg[tpg->tport_tpgt] = tpg;
smp_mb__after_atomic_inc();
match = true;
}
mutex_unlock(&tpg->tv_tpg_mutex);
}
if (match) {
memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
sizeof(vs->vs_vhost_wwpn));
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
vq = &vs->vqs[i].vq;
mutex_lock(&vq->mutex);
vq->private_data = vs_tpg;
vhost_init_used(vq);
mutex_unlock(&vq->mutex);
}
ret = 0;
} else {
ret = -EEXIST;
}
/*
* Act as synchronize_rcu to make sure access to
* old vs->vs_tpg is finished.
*/
vhost_scsi_flush(vs);
kfree(vs->vs_tpg);
vs->vs_tpg = vs_tpg;
out:
mutex_unlock(&vs->dev.mutex);
mutex_unlock(&tcm_vhost_mutex);
return ret;
}
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 *tpg;
struct vhost_virtqueue *vq;
bool match = false;
int index, ret, i;
u8 target;
mutex_lock(&tcm_vhost_mutex);
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].vq)) {
ret = -EFAULT;
goto err_dev;
}
}
if (!vs->vs_tpg) {
ret = 0;
goto err_dev;
}
for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
target = i;
tpg = vs->vs_tpg[target];
if (!tpg)
continue;
mutex_lock(&tpg->tv_tpg_mutex);
tv_tport = tpg->tport;
if (!tv_tport) {
ret = -ENODEV;
goto err_tpg;
}
if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
" does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
tv_tport->tport_name, tpg->tport_tpgt,
t->vhost_wwpn, t->vhost_tpgt);
ret = -EINVAL;
goto err_tpg;
}
tpg->tv_tpg_vhost_count--;
tpg->vhost_scsi = NULL;
vs->vs_tpg[target] = NULL;
match = true;
mutex_unlock(&tpg->tv_tpg_mutex);
}
if (match) {
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
vq = &vs->vqs[i].vq;
mutex_lock(&vq->mutex);
vq->private_data = NULL;
mutex_unlock(&vq->mutex);
}
}
/*
* Act as synchronize_rcu to make sure access to
* old vs->vs_tpg is finished.
*/
vhost_scsi_flush(vs);
kfree(vs->vs_tpg);
vs->vs_tpg = NULL;
WARN_ON(vs->vs_events_nr);
mutex_unlock(&vs->dev.mutex);
mutex_unlock(&tcm_vhost_mutex);
return 0;
err_tpg:
mutex_unlock(&tpg->tv_tpg_mutex);
err_dev:
mutex_unlock(&vs->dev.mutex);
mutex_unlock(&tcm_vhost_mutex);
return ret;
}
static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
{
if (features & ~VHOST_SCSI_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;
smp_wmb();
vhost_scsi_flush(vs);
mutex_unlock(&vs->dev.mutex);
return 0;
}
static int vhost_scsi_open(struct inode *inode, struct file *f)
{
struct vhost_scsi *vs;
struct vhost_virtqueue **vqs;
int r, i;
vs = kzalloc(sizeof(*vs), GFP_KERNEL);
if (!vs)
return -ENOMEM;
vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL);
if (!vqs) {
kfree(vs);
return -ENOMEM;
}
vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);
vhost_work_init(&vs->vs_event_work, tcm_vhost_evt_work);
vs->vs_events_nr = 0;
vs->vs_events_missed = false;
vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
vqs[i] = &vs->vqs[i].vq;
vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
}
r = vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ);
tcm_vhost_init_inflight(vs, NULL);
if (r < 0) {
kfree(vqs);
kfree(vs);
return r;
}
f->private_data = vs;
return 0;
}
static int vhost_scsi_release(struct inode *inode, struct file *f)
{
struct vhost_scsi *vs = f->private_data;
struct vhost_scsi_target t;
mutex_lock(&vs->dev.mutex);
memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
mutex_unlock(&vs->dev.mutex);
vhost_scsi_clear_endpoint(vs, &t);
vhost_dev_stop(&vs->dev);
vhost_dev_cleanup(&vs->dev, false);
/* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
vhost_scsi_flush(vs);
kfree(vs->dev.vqs);
kfree(vs);
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;
u32 __user *eventsp = argp;
u32 events_missed;
u64 features;
int r, abi_version = VHOST_SCSI_ABI_VERSION;
struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
switch (ioctl) {
case VHOST_SCSI_SET_ENDPOINT:
if (copy_from_user(&backend, argp, sizeof backend))
return -EFAULT;
if (backend.reserved != 0)
return -EOPNOTSUPP;
return vhost_scsi_set_endpoint(vs, &backend);
case VHOST_SCSI_CLEAR_ENDPOINT:
if (copy_from_user(&backend, argp, sizeof backend))
return -EFAULT;
if (backend.reserved != 0)
return -EOPNOTSUPP;
return vhost_scsi_clear_endpoint(vs, &backend);
case VHOST_SCSI_GET_ABI_VERSION:
if (copy_to_user(argp, &abi_version, sizeof abi_version))
return -EFAULT;
return 0;
case VHOST_SCSI_SET_EVENTS_MISSED:
if (get_user(events_missed, eventsp))
return -EFAULT;
mutex_lock(&vq->mutex);
vs->vs_events_missed = events_missed;
mutex_unlock(&vq->mutex);
return 0;
case VHOST_SCSI_GET_EVENTS_MISSED:
mutex_lock(&vq->mutex);
events_missed = vs->vs_events_missed;
mutex_unlock(&vq->mutex);
if (put_user(events_missed, eventsp))
return -EFAULT;
return 0;
case VHOST_GET_FEATURES:
features = VHOST_SCSI_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, argp);
/* TODO: flush backend after dev ioctl. */
if (r == -ENOIOCTLCMD)
r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
mutex_unlock(&vs->dev.mutex);
return r;
}
}
#ifdef CONFIG_COMPAT
static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
unsigned long arg)
{
return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
}
#endif
static const struct file_operations vhost_scsi_fops = {
.owner = THIS_MODULE,
.release = vhost_scsi_release,
.unlocked_ioctl = vhost_scsi_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = vhost_scsi_compat_ioctl,
#endif
.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 void
tcm_vhost_do_plug(struct tcm_vhost_tpg *tpg,
struct se_lun *lun, bool plug)
{
struct vhost_scsi *vs = tpg->vhost_scsi;
struct vhost_virtqueue *vq;
u32 reason;
if (!vs)
return;
mutex_lock(&vs->dev.mutex);
if (!vhost_has_feature(&vs->dev, VIRTIO_SCSI_F_HOTPLUG)) {
mutex_unlock(&vs->dev.mutex);
return;
}
if (plug)
reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
else
reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
mutex_lock(&vq->mutex);
tcm_vhost_send_evt(vs, tpg, lun,
VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
mutex_unlock(&vq->mutex);
mutex_unlock(&vs->dev.mutex);
}
static void tcm_vhost_hotplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
{
tcm_vhost_do_plug(tpg, lun, true);
}
static void tcm_vhost_hotunplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
{
tcm_vhost_do_plug(tpg, lun, false);
}
static int tcm_vhost_port_link(struct se_portal_group *se_tpg,
struct se_lun *lun)
{
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
mutex_lock(&tcm_vhost_mutex);
mutex_lock(&tpg->tv_tpg_mutex);
tpg->tv_tpg_port_count++;
mutex_unlock(&tpg->tv_tpg_mutex);
tcm_vhost_hotplug(tpg, lun);
mutex_unlock(&tcm_vhost_mutex);
return 0;
}
static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg,
struct se_lun *lun)
{
struct tcm_vhost_tpg *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
mutex_lock(&tcm_vhost_mutex);
mutex_lock(&tpg->tv_tpg_mutex);
tpg->tv_tpg_port_count--;
mutex_unlock(&tpg->tv_tpg_mutex);
tcm_vhost_hotunplug(tpg, lun);
mutex_unlock(&tcm_vhost_mutex);
}
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 *tpg,
const char *name)
{
struct se_portal_group *se_tpg;
struct tcm_vhost_nexus *tv_nexus;
mutex_lock(&tpg->tv_tpg_mutex);
if (tpg->tpg_nexus) {
mutex_unlock(&tpg->tv_tpg_mutex);
pr_debug("tpg->tpg_nexus already exists\n");
return -EEXIST;
}
se_tpg = &tpg->se_tpg;
tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL);
if (!tv_nexus) {
mutex_unlock(&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(&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(&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);
tpg->tpg_nexus = tv_nexus;
mutex_unlock(&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 (tpg->tv_tpg_port_count != 0) {
mutex_unlock(&tpg->tv_tpg_mutex);
pr_err("Unable to remove TCM_vhost I_T Nexus with"
" active TPG port count: %d\n",
tpg->tv_tpg_port_count);
return -EBUSY;
}
if (tpg->tv_tpg_vhost_count != 0) {
mutex_unlock(&tpg->tv_tpg_mutex);
pr_err("Unable to remove TCM_vhost I_T Nexus with"
" active TPG vhost count: %d\n",
tpg->tv_tpg_vhost_count);
return -EBUSY;
}
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 *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
struct tcm_vhost_nexus *tv_nexus;
ssize_t ret;
mutex_lock(&tpg->tv_tpg_mutex);
tv_nexus = tpg->tpg_nexus;
if (!tv_nexus) {
mutex_unlock(&tpg->tv_tpg_mutex);
return -ENODEV;
}
ret = snprintf(page, PAGE_SIZE, "%s\n",
tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
mutex_unlock(&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 *tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
struct tcm_vhost_tport *tport_wwn = 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(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(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,
.check_stop_free = vhost_scsi_check_stop_free,
.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,
/*
* 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;
/*
* Use our own dedicated workqueue for submitting I/O into
* target core to avoid contention within system_wq.
*/
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("VHOST_SCSI series fabric driver");
MODULE_ALIAS("tcm_vhost");
MODULE_LICENSE("GPL");
module_init(tcm_vhost_init);
module_exit(tcm_vhost_exit);