mirror of
https://github.com/torvalds/linux.git
synced 2024-11-15 08:31:55 +00:00
e5ab564c9e
The dst_cid and src_cid are 64 bits, therefore 64 bit accessors should be
used, and in fact in virtio_transport_common.c only 64 bit accessors are
used. Using 32 bit accessors for 64 bit values breaks big endian systems.
This patch fixes a wrong use of le32_to_cpu in virtio_transport_send_pkt.
Fixes: b911682318
("VSOCK: add loopback to virtio_transport")
Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
723 lines
18 KiB
C
723 lines
18 KiB
C
/*
|
|
* virtio transport for vsock
|
|
*
|
|
* Copyright (C) 2013-2015 Red Hat, Inc.
|
|
* Author: Asias He <asias@redhat.com>
|
|
* Stefan Hajnoczi <stefanha@redhat.com>
|
|
*
|
|
* Some of the code is take from Gerd Hoffmann <kraxel@redhat.com>'s
|
|
* early virtio-vsock proof-of-concept bits.
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2.
|
|
*/
|
|
#include <linux/spinlock.h>
|
|
#include <linux/module.h>
|
|
#include <linux/list.h>
|
|
#include <linux/atomic.h>
|
|
#include <linux/virtio.h>
|
|
#include <linux/virtio_ids.h>
|
|
#include <linux/virtio_config.h>
|
|
#include <linux/virtio_vsock.h>
|
|
#include <net/sock.h>
|
|
#include <linux/mutex.h>
|
|
#include <net/af_vsock.h>
|
|
|
|
static struct workqueue_struct *virtio_vsock_workqueue;
|
|
static struct virtio_vsock *the_virtio_vsock;
|
|
static DEFINE_MUTEX(the_virtio_vsock_mutex); /* protects the_virtio_vsock */
|
|
|
|
struct virtio_vsock {
|
|
struct virtio_device *vdev;
|
|
struct virtqueue *vqs[VSOCK_VQ_MAX];
|
|
|
|
/* Virtqueue processing is deferred to a workqueue */
|
|
struct work_struct tx_work;
|
|
struct work_struct rx_work;
|
|
struct work_struct event_work;
|
|
|
|
/* The following fields are protected by tx_lock. vqs[VSOCK_VQ_TX]
|
|
* must be accessed with tx_lock held.
|
|
*/
|
|
struct mutex tx_lock;
|
|
|
|
struct work_struct send_pkt_work;
|
|
spinlock_t send_pkt_list_lock;
|
|
struct list_head send_pkt_list;
|
|
|
|
struct work_struct loopback_work;
|
|
spinlock_t loopback_list_lock; /* protects loopback_list */
|
|
struct list_head loopback_list;
|
|
|
|
atomic_t queued_replies;
|
|
|
|
/* The following fields are protected by rx_lock. vqs[VSOCK_VQ_RX]
|
|
* must be accessed with rx_lock held.
|
|
*/
|
|
struct mutex rx_lock;
|
|
int rx_buf_nr;
|
|
int rx_buf_max_nr;
|
|
|
|
/* The following fields are protected by event_lock.
|
|
* vqs[VSOCK_VQ_EVENT] must be accessed with event_lock held.
|
|
*/
|
|
struct mutex event_lock;
|
|
struct virtio_vsock_event event_list[8];
|
|
|
|
u32 guest_cid;
|
|
};
|
|
|
|
static struct virtio_vsock *virtio_vsock_get(void)
|
|
{
|
|
return the_virtio_vsock;
|
|
}
|
|
|
|
static u32 virtio_transport_get_local_cid(void)
|
|
{
|
|
struct virtio_vsock *vsock = virtio_vsock_get();
|
|
|
|
return vsock->guest_cid;
|
|
}
|
|
|
|
static void virtio_transport_loopback_work(struct work_struct *work)
|
|
{
|
|
struct virtio_vsock *vsock =
|
|
container_of(work, struct virtio_vsock, loopback_work);
|
|
LIST_HEAD(pkts);
|
|
|
|
spin_lock_bh(&vsock->loopback_list_lock);
|
|
list_splice_init(&vsock->loopback_list, &pkts);
|
|
spin_unlock_bh(&vsock->loopback_list_lock);
|
|
|
|
mutex_lock(&vsock->rx_lock);
|
|
while (!list_empty(&pkts)) {
|
|
struct virtio_vsock_pkt *pkt;
|
|
|
|
pkt = list_first_entry(&pkts, struct virtio_vsock_pkt, list);
|
|
list_del_init(&pkt->list);
|
|
|
|
virtio_transport_recv_pkt(pkt);
|
|
}
|
|
mutex_unlock(&vsock->rx_lock);
|
|
}
|
|
|
|
static int virtio_transport_send_pkt_loopback(struct virtio_vsock *vsock,
|
|
struct virtio_vsock_pkt *pkt)
|
|
{
|
|
int len = pkt->len;
|
|
|
|
spin_lock_bh(&vsock->loopback_list_lock);
|
|
list_add_tail(&pkt->list, &vsock->loopback_list);
|
|
spin_unlock_bh(&vsock->loopback_list_lock);
|
|
|
|
queue_work(virtio_vsock_workqueue, &vsock->loopback_work);
|
|
|
|
return len;
|
|
}
|
|
|
|
static void
|
|
virtio_transport_send_pkt_work(struct work_struct *work)
|
|
{
|
|
struct virtio_vsock *vsock =
|
|
container_of(work, struct virtio_vsock, send_pkt_work);
|
|
struct virtqueue *vq;
|
|
bool added = false;
|
|
bool restart_rx = false;
|
|
|
|
mutex_lock(&vsock->tx_lock);
|
|
|
|
vq = vsock->vqs[VSOCK_VQ_TX];
|
|
|
|
for (;;) {
|
|
struct virtio_vsock_pkt *pkt;
|
|
struct scatterlist hdr, buf, *sgs[2];
|
|
int ret, in_sg = 0, out_sg = 0;
|
|
bool reply;
|
|
|
|
spin_lock_bh(&vsock->send_pkt_list_lock);
|
|
if (list_empty(&vsock->send_pkt_list)) {
|
|
spin_unlock_bh(&vsock->send_pkt_list_lock);
|
|
break;
|
|
}
|
|
|
|
pkt = list_first_entry(&vsock->send_pkt_list,
|
|
struct virtio_vsock_pkt, list);
|
|
list_del_init(&pkt->list);
|
|
spin_unlock_bh(&vsock->send_pkt_list_lock);
|
|
|
|
virtio_transport_deliver_tap_pkt(pkt);
|
|
|
|
reply = pkt->reply;
|
|
|
|
sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
|
|
sgs[out_sg++] = &hdr;
|
|
if (pkt->buf) {
|
|
sg_init_one(&buf, pkt->buf, pkt->len);
|
|
sgs[out_sg++] = &buf;
|
|
}
|
|
|
|
ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, pkt, GFP_KERNEL);
|
|
/* Usually this means that there is no more space available in
|
|
* the vq
|
|
*/
|
|
if (ret < 0) {
|
|
spin_lock_bh(&vsock->send_pkt_list_lock);
|
|
list_add(&pkt->list, &vsock->send_pkt_list);
|
|
spin_unlock_bh(&vsock->send_pkt_list_lock);
|
|
break;
|
|
}
|
|
|
|
if (reply) {
|
|
struct virtqueue *rx_vq = vsock->vqs[VSOCK_VQ_RX];
|
|
int val;
|
|
|
|
val = atomic_dec_return(&vsock->queued_replies);
|
|
|
|
/* Do we now have resources to resume rx processing? */
|
|
if (val + 1 == virtqueue_get_vring_size(rx_vq))
|
|
restart_rx = true;
|
|
}
|
|
|
|
added = true;
|
|
}
|
|
|
|
if (added)
|
|
virtqueue_kick(vq);
|
|
|
|
mutex_unlock(&vsock->tx_lock);
|
|
|
|
if (restart_rx)
|
|
queue_work(virtio_vsock_workqueue, &vsock->rx_work);
|
|
}
|
|
|
|
static int
|
|
virtio_transport_send_pkt(struct virtio_vsock_pkt *pkt)
|
|
{
|
|
struct virtio_vsock *vsock;
|
|
int len = pkt->len;
|
|
|
|
vsock = virtio_vsock_get();
|
|
if (!vsock) {
|
|
virtio_transport_free_pkt(pkt);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (le64_to_cpu(pkt->hdr.dst_cid) == vsock->guest_cid)
|
|
return virtio_transport_send_pkt_loopback(vsock, pkt);
|
|
|
|
if (pkt->reply)
|
|
atomic_inc(&vsock->queued_replies);
|
|
|
|
spin_lock_bh(&vsock->send_pkt_list_lock);
|
|
list_add_tail(&pkt->list, &vsock->send_pkt_list);
|
|
spin_unlock_bh(&vsock->send_pkt_list_lock);
|
|
|
|
queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work);
|
|
return len;
|
|
}
|
|
|
|
static int
|
|
virtio_transport_cancel_pkt(struct vsock_sock *vsk)
|
|
{
|
|
struct virtio_vsock *vsock;
|
|
struct virtio_vsock_pkt *pkt, *n;
|
|
int cnt = 0;
|
|
LIST_HEAD(freeme);
|
|
|
|
vsock = virtio_vsock_get();
|
|
if (!vsock) {
|
|
return -ENODEV;
|
|
}
|
|
|
|
spin_lock_bh(&vsock->send_pkt_list_lock);
|
|
list_for_each_entry_safe(pkt, n, &vsock->send_pkt_list, list) {
|
|
if (pkt->vsk != vsk)
|
|
continue;
|
|
list_move(&pkt->list, &freeme);
|
|
}
|
|
spin_unlock_bh(&vsock->send_pkt_list_lock);
|
|
|
|
list_for_each_entry_safe(pkt, n, &freeme, list) {
|
|
if (pkt->reply)
|
|
cnt++;
|
|
list_del(&pkt->list);
|
|
virtio_transport_free_pkt(pkt);
|
|
}
|
|
|
|
if (cnt) {
|
|
struct virtqueue *rx_vq = vsock->vqs[VSOCK_VQ_RX];
|
|
int new_cnt;
|
|
|
|
new_cnt = atomic_sub_return(cnt, &vsock->queued_replies);
|
|
if (new_cnt + cnt >= virtqueue_get_vring_size(rx_vq) &&
|
|
new_cnt < virtqueue_get_vring_size(rx_vq))
|
|
queue_work(virtio_vsock_workqueue, &vsock->rx_work);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void virtio_vsock_rx_fill(struct virtio_vsock *vsock)
|
|
{
|
|
int buf_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
|
|
struct virtio_vsock_pkt *pkt;
|
|
struct scatterlist hdr, buf, *sgs[2];
|
|
struct virtqueue *vq;
|
|
int ret;
|
|
|
|
vq = vsock->vqs[VSOCK_VQ_RX];
|
|
|
|
do {
|
|
pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
|
|
if (!pkt)
|
|
break;
|
|
|
|
pkt->buf = kmalloc(buf_len, GFP_KERNEL);
|
|
if (!pkt->buf) {
|
|
virtio_transport_free_pkt(pkt);
|
|
break;
|
|
}
|
|
|
|
pkt->len = buf_len;
|
|
|
|
sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
|
|
sgs[0] = &hdr;
|
|
|
|
sg_init_one(&buf, pkt->buf, buf_len);
|
|
sgs[1] = &buf;
|
|
ret = virtqueue_add_sgs(vq, sgs, 0, 2, pkt, GFP_KERNEL);
|
|
if (ret) {
|
|
virtio_transport_free_pkt(pkt);
|
|
break;
|
|
}
|
|
vsock->rx_buf_nr++;
|
|
} while (vq->num_free);
|
|
if (vsock->rx_buf_nr > vsock->rx_buf_max_nr)
|
|
vsock->rx_buf_max_nr = vsock->rx_buf_nr;
|
|
virtqueue_kick(vq);
|
|
}
|
|
|
|
static void virtio_transport_tx_work(struct work_struct *work)
|
|
{
|
|
struct virtio_vsock *vsock =
|
|
container_of(work, struct virtio_vsock, tx_work);
|
|
struct virtqueue *vq;
|
|
bool added = false;
|
|
|
|
vq = vsock->vqs[VSOCK_VQ_TX];
|
|
mutex_lock(&vsock->tx_lock);
|
|
do {
|
|
struct virtio_vsock_pkt *pkt;
|
|
unsigned int len;
|
|
|
|
virtqueue_disable_cb(vq);
|
|
while ((pkt = virtqueue_get_buf(vq, &len)) != NULL) {
|
|
virtio_transport_free_pkt(pkt);
|
|
added = true;
|
|
}
|
|
} while (!virtqueue_enable_cb(vq));
|
|
mutex_unlock(&vsock->tx_lock);
|
|
|
|
if (added)
|
|
queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work);
|
|
}
|
|
|
|
/* Is there space left for replies to rx packets? */
|
|
static bool virtio_transport_more_replies(struct virtio_vsock *vsock)
|
|
{
|
|
struct virtqueue *vq = vsock->vqs[VSOCK_VQ_RX];
|
|
int val;
|
|
|
|
smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */
|
|
val = atomic_read(&vsock->queued_replies);
|
|
|
|
return val < virtqueue_get_vring_size(vq);
|
|
}
|
|
|
|
static void virtio_transport_rx_work(struct work_struct *work)
|
|
{
|
|
struct virtio_vsock *vsock =
|
|
container_of(work, struct virtio_vsock, rx_work);
|
|
struct virtqueue *vq;
|
|
|
|
vq = vsock->vqs[VSOCK_VQ_RX];
|
|
|
|
mutex_lock(&vsock->rx_lock);
|
|
|
|
do {
|
|
virtqueue_disable_cb(vq);
|
|
for (;;) {
|
|
struct virtio_vsock_pkt *pkt;
|
|
unsigned int len;
|
|
|
|
if (!virtio_transport_more_replies(vsock)) {
|
|
/* Stop rx until the device processes already
|
|
* pending replies. Leave rx virtqueue
|
|
* callbacks disabled.
|
|
*/
|
|
goto out;
|
|
}
|
|
|
|
pkt = virtqueue_get_buf(vq, &len);
|
|
if (!pkt) {
|
|
break;
|
|
}
|
|
|
|
vsock->rx_buf_nr--;
|
|
|
|
/* Drop short/long packets */
|
|
if (unlikely(len < sizeof(pkt->hdr) ||
|
|
len > sizeof(pkt->hdr) + pkt->len)) {
|
|
virtio_transport_free_pkt(pkt);
|
|
continue;
|
|
}
|
|
|
|
pkt->len = len - sizeof(pkt->hdr);
|
|
virtio_transport_deliver_tap_pkt(pkt);
|
|
virtio_transport_recv_pkt(pkt);
|
|
}
|
|
} while (!virtqueue_enable_cb(vq));
|
|
|
|
out:
|
|
if (vsock->rx_buf_nr < vsock->rx_buf_max_nr / 2)
|
|
virtio_vsock_rx_fill(vsock);
|
|
mutex_unlock(&vsock->rx_lock);
|
|
}
|
|
|
|
/* event_lock must be held */
|
|
static int virtio_vsock_event_fill_one(struct virtio_vsock *vsock,
|
|
struct virtio_vsock_event *event)
|
|
{
|
|
struct scatterlist sg;
|
|
struct virtqueue *vq;
|
|
|
|
vq = vsock->vqs[VSOCK_VQ_EVENT];
|
|
|
|
sg_init_one(&sg, event, sizeof(*event));
|
|
|
|
return virtqueue_add_inbuf(vq, &sg, 1, event, GFP_KERNEL);
|
|
}
|
|
|
|
/* event_lock must be held */
|
|
static void virtio_vsock_event_fill(struct virtio_vsock *vsock)
|
|
{
|
|
size_t i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(vsock->event_list); i++) {
|
|
struct virtio_vsock_event *event = &vsock->event_list[i];
|
|
|
|
virtio_vsock_event_fill_one(vsock, event);
|
|
}
|
|
|
|
virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]);
|
|
}
|
|
|
|
static void virtio_vsock_reset_sock(struct sock *sk)
|
|
{
|
|
lock_sock(sk);
|
|
sk->sk_state = TCP_CLOSE;
|
|
sk->sk_err = ECONNRESET;
|
|
sk->sk_error_report(sk);
|
|
release_sock(sk);
|
|
}
|
|
|
|
static void virtio_vsock_update_guest_cid(struct virtio_vsock *vsock)
|
|
{
|
|
struct virtio_device *vdev = vsock->vdev;
|
|
__le64 guest_cid;
|
|
|
|
vdev->config->get(vdev, offsetof(struct virtio_vsock_config, guest_cid),
|
|
&guest_cid, sizeof(guest_cid));
|
|
vsock->guest_cid = le64_to_cpu(guest_cid);
|
|
}
|
|
|
|
/* event_lock must be held */
|
|
static void virtio_vsock_event_handle(struct virtio_vsock *vsock,
|
|
struct virtio_vsock_event *event)
|
|
{
|
|
switch (le32_to_cpu(event->id)) {
|
|
case VIRTIO_VSOCK_EVENT_TRANSPORT_RESET:
|
|
virtio_vsock_update_guest_cid(vsock);
|
|
vsock_for_each_connected_socket(virtio_vsock_reset_sock);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void virtio_transport_event_work(struct work_struct *work)
|
|
{
|
|
struct virtio_vsock *vsock =
|
|
container_of(work, struct virtio_vsock, event_work);
|
|
struct virtqueue *vq;
|
|
|
|
vq = vsock->vqs[VSOCK_VQ_EVENT];
|
|
|
|
mutex_lock(&vsock->event_lock);
|
|
|
|
do {
|
|
struct virtio_vsock_event *event;
|
|
unsigned int len;
|
|
|
|
virtqueue_disable_cb(vq);
|
|
while ((event = virtqueue_get_buf(vq, &len)) != NULL) {
|
|
if (len == sizeof(*event))
|
|
virtio_vsock_event_handle(vsock, event);
|
|
|
|
virtio_vsock_event_fill_one(vsock, event);
|
|
}
|
|
} while (!virtqueue_enable_cb(vq));
|
|
|
|
virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]);
|
|
|
|
mutex_unlock(&vsock->event_lock);
|
|
}
|
|
|
|
static void virtio_vsock_event_done(struct virtqueue *vq)
|
|
{
|
|
struct virtio_vsock *vsock = vq->vdev->priv;
|
|
|
|
if (!vsock)
|
|
return;
|
|
queue_work(virtio_vsock_workqueue, &vsock->event_work);
|
|
}
|
|
|
|
static void virtio_vsock_tx_done(struct virtqueue *vq)
|
|
{
|
|
struct virtio_vsock *vsock = vq->vdev->priv;
|
|
|
|
if (!vsock)
|
|
return;
|
|
queue_work(virtio_vsock_workqueue, &vsock->tx_work);
|
|
}
|
|
|
|
static void virtio_vsock_rx_done(struct virtqueue *vq)
|
|
{
|
|
struct virtio_vsock *vsock = vq->vdev->priv;
|
|
|
|
if (!vsock)
|
|
return;
|
|
queue_work(virtio_vsock_workqueue, &vsock->rx_work);
|
|
}
|
|
|
|
static struct virtio_transport virtio_transport = {
|
|
.transport = {
|
|
.get_local_cid = virtio_transport_get_local_cid,
|
|
|
|
.init = virtio_transport_do_socket_init,
|
|
.destruct = virtio_transport_destruct,
|
|
.release = virtio_transport_release,
|
|
.connect = virtio_transport_connect,
|
|
.shutdown = virtio_transport_shutdown,
|
|
.cancel_pkt = virtio_transport_cancel_pkt,
|
|
|
|
.dgram_bind = virtio_transport_dgram_bind,
|
|
.dgram_dequeue = virtio_transport_dgram_dequeue,
|
|
.dgram_enqueue = virtio_transport_dgram_enqueue,
|
|
.dgram_allow = virtio_transport_dgram_allow,
|
|
|
|
.stream_dequeue = virtio_transport_stream_dequeue,
|
|
.stream_enqueue = virtio_transport_stream_enqueue,
|
|
.stream_has_data = virtio_transport_stream_has_data,
|
|
.stream_has_space = virtio_transport_stream_has_space,
|
|
.stream_rcvhiwat = virtio_transport_stream_rcvhiwat,
|
|
.stream_is_active = virtio_transport_stream_is_active,
|
|
.stream_allow = virtio_transport_stream_allow,
|
|
|
|
.notify_poll_in = virtio_transport_notify_poll_in,
|
|
.notify_poll_out = virtio_transport_notify_poll_out,
|
|
.notify_recv_init = virtio_transport_notify_recv_init,
|
|
.notify_recv_pre_block = virtio_transport_notify_recv_pre_block,
|
|
.notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue,
|
|
.notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue,
|
|
.notify_send_init = virtio_transport_notify_send_init,
|
|
.notify_send_pre_block = virtio_transport_notify_send_pre_block,
|
|
.notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue,
|
|
.notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue,
|
|
|
|
.set_buffer_size = virtio_transport_set_buffer_size,
|
|
.set_min_buffer_size = virtio_transport_set_min_buffer_size,
|
|
.set_max_buffer_size = virtio_transport_set_max_buffer_size,
|
|
.get_buffer_size = virtio_transport_get_buffer_size,
|
|
.get_min_buffer_size = virtio_transport_get_min_buffer_size,
|
|
.get_max_buffer_size = virtio_transport_get_max_buffer_size,
|
|
},
|
|
|
|
.send_pkt = virtio_transport_send_pkt,
|
|
};
|
|
|
|
static int virtio_vsock_probe(struct virtio_device *vdev)
|
|
{
|
|
vq_callback_t *callbacks[] = {
|
|
virtio_vsock_rx_done,
|
|
virtio_vsock_tx_done,
|
|
virtio_vsock_event_done,
|
|
};
|
|
static const char * const names[] = {
|
|
"rx",
|
|
"tx",
|
|
"event",
|
|
};
|
|
struct virtio_vsock *vsock = NULL;
|
|
int ret;
|
|
|
|
ret = mutex_lock_interruptible(&the_virtio_vsock_mutex);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Only one virtio-vsock device per guest is supported */
|
|
if (the_virtio_vsock) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
vsock = kzalloc(sizeof(*vsock), GFP_KERNEL);
|
|
if (!vsock) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
vsock->vdev = vdev;
|
|
|
|
ret = virtio_find_vqs(vsock->vdev, VSOCK_VQ_MAX,
|
|
vsock->vqs, callbacks, names,
|
|
NULL);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
virtio_vsock_update_guest_cid(vsock);
|
|
|
|
ret = vsock_core_init(&virtio_transport.transport);
|
|
if (ret < 0)
|
|
goto out_vqs;
|
|
|
|
vsock->rx_buf_nr = 0;
|
|
vsock->rx_buf_max_nr = 0;
|
|
atomic_set(&vsock->queued_replies, 0);
|
|
|
|
vdev->priv = vsock;
|
|
the_virtio_vsock = vsock;
|
|
mutex_init(&vsock->tx_lock);
|
|
mutex_init(&vsock->rx_lock);
|
|
mutex_init(&vsock->event_lock);
|
|
spin_lock_init(&vsock->send_pkt_list_lock);
|
|
INIT_LIST_HEAD(&vsock->send_pkt_list);
|
|
spin_lock_init(&vsock->loopback_list_lock);
|
|
INIT_LIST_HEAD(&vsock->loopback_list);
|
|
INIT_WORK(&vsock->rx_work, virtio_transport_rx_work);
|
|
INIT_WORK(&vsock->tx_work, virtio_transport_tx_work);
|
|
INIT_WORK(&vsock->event_work, virtio_transport_event_work);
|
|
INIT_WORK(&vsock->send_pkt_work, virtio_transport_send_pkt_work);
|
|
INIT_WORK(&vsock->loopback_work, virtio_transport_loopback_work);
|
|
|
|
mutex_lock(&vsock->rx_lock);
|
|
virtio_vsock_rx_fill(vsock);
|
|
mutex_unlock(&vsock->rx_lock);
|
|
|
|
mutex_lock(&vsock->event_lock);
|
|
virtio_vsock_event_fill(vsock);
|
|
mutex_unlock(&vsock->event_lock);
|
|
|
|
mutex_unlock(&the_virtio_vsock_mutex);
|
|
return 0;
|
|
|
|
out_vqs:
|
|
vsock->vdev->config->del_vqs(vsock->vdev);
|
|
out:
|
|
kfree(vsock);
|
|
mutex_unlock(&the_virtio_vsock_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void virtio_vsock_remove(struct virtio_device *vdev)
|
|
{
|
|
struct virtio_vsock *vsock = vdev->priv;
|
|
struct virtio_vsock_pkt *pkt;
|
|
|
|
flush_work(&vsock->loopback_work);
|
|
flush_work(&vsock->rx_work);
|
|
flush_work(&vsock->tx_work);
|
|
flush_work(&vsock->event_work);
|
|
flush_work(&vsock->send_pkt_work);
|
|
|
|
vdev->config->reset(vdev);
|
|
|
|
mutex_lock(&vsock->rx_lock);
|
|
while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_RX])))
|
|
virtio_transport_free_pkt(pkt);
|
|
mutex_unlock(&vsock->rx_lock);
|
|
|
|
mutex_lock(&vsock->tx_lock);
|
|
while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_TX])))
|
|
virtio_transport_free_pkt(pkt);
|
|
mutex_unlock(&vsock->tx_lock);
|
|
|
|
spin_lock_bh(&vsock->send_pkt_list_lock);
|
|
while (!list_empty(&vsock->send_pkt_list)) {
|
|
pkt = list_first_entry(&vsock->send_pkt_list,
|
|
struct virtio_vsock_pkt, list);
|
|
list_del(&pkt->list);
|
|
virtio_transport_free_pkt(pkt);
|
|
}
|
|
spin_unlock_bh(&vsock->send_pkt_list_lock);
|
|
|
|
spin_lock_bh(&vsock->loopback_list_lock);
|
|
while (!list_empty(&vsock->loopback_list)) {
|
|
pkt = list_first_entry(&vsock->loopback_list,
|
|
struct virtio_vsock_pkt, list);
|
|
list_del(&pkt->list);
|
|
virtio_transport_free_pkt(pkt);
|
|
}
|
|
spin_unlock_bh(&vsock->loopback_list_lock);
|
|
|
|
mutex_lock(&the_virtio_vsock_mutex);
|
|
the_virtio_vsock = NULL;
|
|
vsock_core_exit();
|
|
mutex_unlock(&the_virtio_vsock_mutex);
|
|
|
|
vdev->config->del_vqs(vdev);
|
|
|
|
kfree(vsock);
|
|
}
|
|
|
|
static struct virtio_device_id id_table[] = {
|
|
{ VIRTIO_ID_VSOCK, VIRTIO_DEV_ANY_ID },
|
|
{ 0 },
|
|
};
|
|
|
|
static unsigned int features[] = {
|
|
};
|
|
|
|
static struct virtio_driver virtio_vsock_driver = {
|
|
.feature_table = features,
|
|
.feature_table_size = ARRAY_SIZE(features),
|
|
.driver.name = KBUILD_MODNAME,
|
|
.driver.owner = THIS_MODULE,
|
|
.id_table = id_table,
|
|
.probe = virtio_vsock_probe,
|
|
.remove = virtio_vsock_remove,
|
|
};
|
|
|
|
static int __init virtio_vsock_init(void)
|
|
{
|
|
int ret;
|
|
|
|
virtio_vsock_workqueue = alloc_workqueue("virtio_vsock", 0, 0);
|
|
if (!virtio_vsock_workqueue)
|
|
return -ENOMEM;
|
|
ret = register_virtio_driver(&virtio_vsock_driver);
|
|
if (ret)
|
|
destroy_workqueue(virtio_vsock_workqueue);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit virtio_vsock_exit(void)
|
|
{
|
|
unregister_virtio_driver(&virtio_vsock_driver);
|
|
destroy_workqueue(virtio_vsock_workqueue);
|
|
}
|
|
|
|
module_init(virtio_vsock_init);
|
|
module_exit(virtio_vsock_exit);
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Asias He");
|
|
MODULE_DESCRIPTION("virtio transport for vsock");
|
|
MODULE_DEVICE_TABLE(virtio, id_table);
|