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Revert "Merge branch 'vsock-virtio'" 

This reverts commit 0d76d6e8b2 and merge
commit c402293bd7, reversing changes made
to c89359a42e.

The virtio-vsock device specification is not finalized yet.  Michael
Tsirkin voiced concerned about merging this code when the hardware
interface (and possibly the userspace interface) could still change.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefan Hajnoczi 2015-12-09 10:51:12 +08:00 committed by David S. Miller
parent bc0b8b66e0
commit 8ac2837c89
14 changed files with 0 additions and 2778 deletions
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4
drivers/vhost/Kconfig
View File

@ -47,7 +47,3 @@ config VHOST_CROSS_ENDIAN_LEGACY
adds some overhead, it is disabled by default.
If unsure, say "N".
if STAGING
source "drivers/vhost/Kconfig.vsock"
endif

7
drivers/vhost/Kconfig.vsock
View File

@ -1,7 +0,0 @@
config VHOST_VSOCK
tristate "vhost virtio-vsock driver"
depends on VSOCKETS && EVENTFD
select VIRTIO_VSOCKETS_COMMON
default n
---help---
Say M here to enable the vhost-vsock for virtio-vsock guests

4
drivers/vhost/Makefile
View File

@ -4,9 +4,5 @@ vhost_net-y := net.o
obj-$(CONFIG_VHOST_SCSI) += vhost_scsi.o
vhost_scsi-y := scsi.o
obj-$(CONFIG_VHOST_VSOCK) += vhost_vsock.o
vhost_vsock-y := vsock.o
obj-$(CONFIG_VHOST_RING) += vringh.o
obj-$(CONFIG_VHOST) += vhost.o

630
drivers/vhost/vsock.c
View File

@ -1,630 +0,0 @@
/*
* vhost transport for vsock
*
* Copyright (C) 2013-2015 Red Hat, Inc.
* Author: Asias He <asias@redhat.com>
* Stefan Hajnoczi <stefanha@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2.
*/
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <net/sock.h>
#include <linux/virtio_vsock.h>
#include <linux/vhost.h>
#include <net/af_vsock.h>
#include "vhost.h"
#include "vsock.h"
#define VHOST_VSOCK_DEFAULT_HOST_CID 2
static int vhost_transport_socket_init(struct vsock_sock *vsk,
struct vsock_sock *psk);
enum {
VHOST_VSOCK_FEATURES = VHOST_FEATURES,
};
/* Used to track all the vhost_vsock instances on the system. */
static LIST_HEAD(vhost_vsock_list);
static DEFINE_MUTEX(vhost_vsock_mutex);
struct vhost_vsock_virtqueue {
struct vhost_virtqueue vq;
};
struct vhost_vsock {
/* Vhost device */
struct vhost_dev dev;
/* Vhost vsock virtqueue*/
struct vhost_vsock_virtqueue vqs[VSOCK_VQ_MAX];
/* Link to global vhost_vsock_list*/
struct list_head list;
/* Head for pkt from host to guest */
struct list_head send_pkt_list;
/* Work item to send pkt */
struct vhost_work send_pkt_work;
/* Wait queue for send pkt */
wait_queue_head_t queue_wait;
/* Used for global tx buf limitation */
u32 total_tx_buf;
/* Guest contex id this vhost_vsock instance handles */
u32 guest_cid;
};
static u32 vhost_transport_get_local_cid(void)
{
return VHOST_VSOCK_DEFAULT_HOST_CID;
}
static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
{
struct vhost_vsock *vsock;
mutex_lock(&vhost_vsock_mutex);
list_for_each_entry(vsock, &vhost_vsock_list, list) {
if (vsock->guest_cid == guest_cid) {
mutex_unlock(&vhost_vsock_mutex);
return vsock;
}
}
mutex_unlock(&vhost_vsock_mutex);
return NULL;
}
static void
vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
struct vhost_virtqueue *vq)
{
bool added = false;
mutex_lock(&vq->mutex);
vhost_disable_notify(&vsock->dev, vq);
for (;;) {
struct virtio_vsock_pkt *pkt;
struct iov_iter iov_iter;
unsigned out, in;
struct sock *sk;
size_t nbytes;
size_t len;
int head;
if (list_empty(&vsock->send_pkt_list)) {
vhost_enable_notify(&vsock->dev, vq);
break;
}
head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
&out, &in, NULL, NULL);
pr_debug("%s: head = %d\n", __func__, head);
if (head < 0)
break;
if (head == vq->num) {
if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
vhost_disable_notify(&vsock->dev, vq);
continue;
}
break;
}
pkt = list_first_entry(&vsock->send_pkt_list,
struct virtio_vsock_pkt, list);
list_del_init(&pkt->list);
if (out) {
virtio_transport_free_pkt(pkt);
vq_err(vq, "Expected 0 output buffers, got %u\n", out);
break;
}
len = iov_length(&vq->iov[out], in);
iov_iter_init(&iov_iter, READ, &vq->iov[out], in, len);
nbytes = copy_to_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter);
if (nbytes != sizeof(pkt->hdr)) {
virtio_transport_free_pkt(pkt);
vq_err(vq, "Faulted on copying pkt hdr\n");
break;
}
nbytes = copy_to_iter(pkt->buf, pkt->len, &iov_iter);
if (nbytes != pkt->len) {
virtio_transport_free_pkt(pkt);
vq_err(vq, "Faulted on copying pkt buf\n");
break;
}
vhost_add_used(vq, head, pkt->len); /* TODO should this be sizeof(pkt->hdr) + pkt->len? */
added = true;
virtio_transport_dec_tx_pkt(pkt);
vsock->total_tx_buf -= pkt->len;
sk = sk_vsock(pkt->trans->vsk);
/* Release refcnt taken in vhost_transport_send_pkt */
sock_put(sk);
virtio_transport_free_pkt(pkt);
}
if (added)
vhost_signal(&vsock->dev, vq);
mutex_unlock(&vq->mutex);
if (added)
wake_up(&vsock->queue_wait);
}
static void vhost_transport_send_pkt_work(struct vhost_work *work)
{
struct vhost_virtqueue *vq;
struct vhost_vsock *vsock;
vsock = container_of(work, struct vhost_vsock, send_pkt_work);
vq = &vsock->vqs[VSOCK_VQ_RX].vq;
vhost_transport_do_send_pkt(vsock, vq);
}
static int
vhost_transport_send_pkt(struct vsock_sock *vsk,
struct virtio_vsock_pkt_info *info)
{
u32 src_cid, src_port, dst_cid, dst_port;
struct virtio_transport *trans;
struct virtio_vsock_pkt *pkt;
struct vhost_virtqueue *vq;
struct vhost_vsock *vsock;
u32 pkt_len = info->pkt_len;
DEFINE_WAIT(wait);
src_cid = vhost_transport_get_local_cid();
src_port = vsk->local_addr.svm_port;
if (!info->remote_cid) {
dst_cid = vsk->remote_addr.svm_cid;
dst_port = vsk->remote_addr.svm_port;
} else {
dst_cid = info->remote_cid;
dst_port = info->remote_port;
}
/* Find the vhost_vsock according to guest context id */
vsock = vhost_vsock_get(dst_cid);
if (!vsock)
return -ENODEV;
trans = vsk->trans;
vq = &vsock->vqs[VSOCK_VQ_RX].vq;
/* we can send less than pkt_len bytes */
if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE)
pkt_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
/* virtio_transport_get_credit might return less than pkt_len credit */
pkt_len = virtio_transport_get_credit(trans, pkt_len);
/* Do not send zero length OP_RW pkt*/
if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW)
return pkt_len;
/* Respect global tx buf limitation */
mutex_lock(&vq->mutex);
while (pkt_len + vsock->total_tx_buf > VIRTIO_VSOCK_MAX_TX_BUF_SIZE) {
prepare_to_wait_exclusive(&vsock->queue_wait, &wait,
TASK_UNINTERRUPTIBLE);
mutex_unlock(&vq->mutex);
schedule();
mutex_lock(&vq->mutex);
finish_wait(&vsock->queue_wait, &wait);
}
vsock->total_tx_buf += pkt_len;
mutex_unlock(&vq->mutex);
pkt = virtio_transport_alloc_pkt(vsk, info, pkt_len,
src_cid, src_port,
dst_cid, dst_port);
if (!pkt) {
mutex_lock(&vq->mutex);
vsock->total_tx_buf -= pkt_len;
mutex_unlock(&vq->mutex);
virtio_transport_put_credit(trans, pkt_len);
return -ENOMEM;
}
pr_debug("%s:info->pkt_len= %d\n", __func__, pkt_len);
/* Released in vhost_transport_do_send_pkt */
sock_hold(&trans->vsk->sk);
virtio_transport_inc_tx_pkt(pkt);
/* Queue it up in vhost work */
mutex_lock(&vq->mutex);
list_add_tail(&pkt->list, &vsock->send_pkt_list);
vhost_work_queue(&vsock->dev, &vsock->send_pkt_work);
mutex_unlock(&vq->mutex);
return pkt_len;
}
static struct virtio_transport_pkt_ops vhost_ops = {
.send_pkt = vhost_transport_send_pkt,
};
static struct virtio_vsock_pkt *
vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq,
unsigned int out, unsigned int in)
{
struct virtio_vsock_pkt *pkt;
struct iov_iter iov_iter;
size_t nbytes;
size_t len;
if (in != 0) {
vq_err(vq, "Expected 0 input buffers, got %u\n", in);
return NULL;
}
pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
if (!pkt)
return NULL;
len = iov_length(vq->iov, out);
iov_iter_init(&iov_iter, WRITE, vq->iov, out, len);
nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter);
if (nbytes != sizeof(pkt->hdr)) {
vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n",
sizeof(pkt->hdr), nbytes);
kfree(pkt);
return NULL;
}
if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_DGRAM)
pkt->len = le32_to_cpu(pkt->hdr.len) & 0XFFFF;
else if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM)
pkt->len = le32_to_cpu(pkt->hdr.len);
/* No payload */
if (!pkt->len)
return pkt;
/* The pkt is too big */
if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
kfree(pkt);
return NULL;
}
pkt->buf = kmalloc(pkt->len, GFP_KERNEL);
if (!pkt->buf) {
kfree(pkt);
return NULL;
}
nbytes = copy_from_iter(pkt->buf, pkt->len, &iov_iter);
if (nbytes != pkt->len) {
vq_err(vq, "Expected %u byte payload, got %zu bytes\n",
pkt->len, nbytes);
virtio_transport_free_pkt(pkt);
return NULL;
}
return pkt;
}
static void vhost_vsock_handle_ctl_kick(struct vhost_work *work)
{
struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
poll.work);
struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
dev);
pr_debug("%s vq=%p, vsock=%p\n", __func__, vq, vsock);
}
static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
{
struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
poll.work);
struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
dev);
struct virtio_vsock_pkt *pkt;
int head;
unsigned int out, in;
bool added = false;
u32 len;
mutex_lock(&vq->mutex);
vhost_disable_notify(&vsock->dev, vq);
for (;;) {
head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
&out, &in, NULL, NULL);
if (head < 0)
break;
if (head == vq->num) {
if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
vhost_disable_notify(&vsock->dev, vq);
continue;
}
break;
}
pkt = vhost_vsock_alloc_pkt(vq, out, in);
if (!pkt) {
vq_err(vq, "Faulted on pkt\n");
continue;
}
len = pkt->len;
/* Only accept correctly addressed packets */
if (le32_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid &&
le32_to_cpu(pkt->hdr.dst_cid) == vhost_transport_get_local_cid())
virtio_transport_recv_pkt(pkt);
else
virtio_transport_free_pkt(pkt);
vhost_add_used(vq, head, len);
added = true;
}
if (added)
vhost_signal(&vsock->dev, vq);
mutex_unlock(&vq->mutex);
}
static void vhost_vsock_handle_rx_kick(struct vhost_work *work)
{
struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
poll.work);
struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
dev);
vhost_transport_do_send_pkt(vsock, vq);
}
static int vhost_vsock_dev_open(struct inode *inode, struct file *file)
{
struct vhost_virtqueue **vqs;
struct vhost_vsock *vsock;
int ret;
vsock = kzalloc(sizeof(*vsock), GFP_KERNEL);
if (!vsock)
return -ENOMEM;
pr_debug("%s:vsock=%p\n", __func__, vsock);
vqs = kmalloc(VSOCK_VQ_MAX * sizeof(*vqs), GFP_KERNEL);
if (!vqs) {
ret = -ENOMEM;
goto out;
}
vqs[VSOCK_VQ_CTRL] = &vsock->vqs[VSOCK_VQ_CTRL].vq;
vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX].vq;
vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX].vq;
vsock->vqs[VSOCK_VQ_CTRL].vq.handle_kick = vhost_vsock_handle_ctl_kick;
vsock->vqs[VSOCK_VQ_TX].vq.handle_kick = vhost_vsock_handle_tx_kick;
vsock->vqs[VSOCK_VQ_RX].vq.handle_kick = vhost_vsock_handle_rx_kick;
vhost_dev_init(&vsock->dev, vqs, VSOCK_VQ_MAX);
file->private_data = vsock;
init_waitqueue_head(&vsock->queue_wait);
INIT_LIST_HEAD(&vsock->send_pkt_list);
vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work);
mutex_lock(&vhost_vsock_mutex);
list_add_tail(&vsock->list, &vhost_vsock_list);
mutex_unlock(&vhost_vsock_mutex);
return 0;
out:
kfree(vsock);
return ret;
}
static void vhost_vsock_flush(struct vhost_vsock *vsock)
{
int i;
for (i = 0; i < VSOCK_VQ_MAX; i++)
vhost_poll_flush(&vsock->vqs[i].vq.poll);
vhost_work_flush(&vsock->dev, &vsock->send_pkt_work);
}
static int vhost_vsock_dev_release(struct inode *inode, struct file *file)
{
struct vhost_vsock *vsock = file->private_data;
mutex_lock(&vhost_vsock_mutex);
list_del(&vsock->list);
mutex_unlock(&vhost_vsock_mutex);
vhost_dev_stop(&vsock->dev);
vhost_vsock_flush(vsock);
vhost_dev_cleanup(&vsock->dev, false);
kfree(vsock->dev.vqs);
kfree(vsock);
return 0;
}
static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u32 guest_cid)
{
struct vhost_vsock *other;
/* Refuse reserved CIDs */
if (guest_cid <= VMADDR_CID_HOST) {
return -EINVAL;
}
/* Refuse if CID is already in use */
other = vhost_vsock_get(guest_cid);
if (other && other != vsock) {
return -EADDRINUSE;
}
mutex_lock(&vhost_vsock_mutex);
vsock->guest_cid = guest_cid;
pr_debug("%s:guest_cid=%d\n", __func__, guest_cid);
mutex_unlock(&vhost_vsock_mutex);
return 0;
}
static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features)
{
struct vhost_virtqueue *vq;
int i;
if (features & ~VHOST_VSOCK_FEATURES)
return -EOPNOTSUPP;
mutex_lock(&vsock->dev.mutex);
if ((features & (1 << VHOST_F_LOG_ALL)) &&
!vhost_log_access_ok(&vsock->dev)) {
mutex_unlock(&vsock->dev.mutex);
return -EFAULT;
}
for (i = 0; i < VSOCK_VQ_MAX; i++) {
vq = &vsock->vqs[i].vq;
mutex_lock(&vq->mutex);
vq->acked_features = features;
mutex_unlock(&vq->mutex);
}
mutex_unlock(&vsock->dev.mutex);
return 0;
}
static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl,
unsigned long arg)
{
struct vhost_vsock *vsock = f->private_data;
void __user *argp = (void __user *)arg;
u64 __user *featurep = argp;
u32 __user *cidp = argp;
u32 guest_cid;
u64 features;
int r;
switch (ioctl) {
case VHOST_VSOCK_SET_GUEST_CID:
if (get_user(guest_cid, cidp))
return -EFAULT;
return vhost_vsock_set_cid(vsock, guest_cid);
case VHOST_GET_FEATURES:
features = VHOST_VSOCK_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_vsock_set_features(vsock, features);
default:
mutex_lock(&vsock->dev.mutex);
r = vhost_dev_ioctl(&vsock->dev, ioctl, argp);
if (r == -ENOIOCTLCMD)
r = vhost_vring_ioctl(&vsock->dev, ioctl, argp);
else
vhost_vsock_flush(vsock);
mutex_unlock(&vsock->dev.mutex);
return r;
}
}
static const struct file_operations vhost_vsock_fops = {
.owner = THIS_MODULE,
.open = vhost_vsock_dev_open,
.release = vhost_vsock_dev_release,
.llseek = noop_llseek,
.unlocked_ioctl = vhost_vsock_dev_ioctl,
};
static struct miscdevice vhost_vsock_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = "vhost-vsock",
.fops = &vhost_vsock_fops,
};
static int
vhost_transport_socket_init(struct vsock_sock *vsk, struct vsock_sock *psk)
{
struct virtio_transport *trans;
int ret;
ret = virtio_transport_do_socket_init(vsk, psk);
if (ret)
return ret;
trans = vsk->trans;
trans->ops = &vhost_ops;
return ret;
}
static struct vsock_transport vhost_transport = {
.get_local_cid = vhost_transport_get_local_cid,
.init = vhost_transport_socket_init,
.destruct = virtio_transport_destruct,
.release = virtio_transport_release,
.connect = virtio_transport_connect,
.shutdown = virtio_transport_shutdown,
.dgram_enqueue = virtio_transport_dgram_enqueue,
.dgram_dequeue = virtio_transport_dgram_dequeue,
.dgram_bind = virtio_transport_dgram_bind,
.dgram_allow = virtio_transport_dgram_allow,
.stream_enqueue = virtio_transport_stream_enqueue,
.stream_dequeue = virtio_transport_stream_dequeue,
.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,
};
static int __init vhost_vsock_init(void)
{
int ret;
ret = vsock_core_init(&vhost_transport);
if (ret < 0)
return ret;
return misc_register(&vhost_vsock_misc);
};
static void __exit vhost_vsock_exit(void)
{
misc_deregister(&vhost_vsock_misc);
vsock_core_exit();
};
module_init(vhost_vsock_init);
module_exit(vhost_vsock_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Asias He");
MODULE_DESCRIPTION("vhost transport for vsock ");

4
drivers/vhost/vsock.h
View File

@ -1,4 +0,0 @@
#ifndef VHOST_VSOCK_H
#define VHOST_VSOCK_H
#define VHOST_VSOCK_SET_GUEST_CID _IOW(VHOST_VIRTIO, 0x60, __u32)
#endif

209
include/linux/virtio_vsock.h
View File

@ -1,209 +0,0 @@
/*
* This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
* anyone can use the definitions to implement compatible drivers/servers:
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of IBM nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Copyright (C) Red Hat, Inc., 2013-2015
* Copyright (C) Asias He <asias@redhat.com>, 2013
* Copyright (C) Stefan Hajnoczi <stefanha@redhat.com>, 2015
*/
#ifndef _LINUX_VIRTIO_VSOCK_H
#define _LINUX_VIRTIO_VSOCK_H
#include <uapi/linux/virtio_vsock.h>
#include <linux/socket.h>
#include <net/sock.h>
#define VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE 128
#define VIRTIO_VSOCK_DEFAULT_BUF_SIZE (1024 * 256)
#define VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE (1024 * 256)
#define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE (1024 * 4)
#define VIRTIO_VSOCK_MAX_BUF_SIZE 0xFFFFFFFFUL
#define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE (1024 * 64)
#define VIRTIO_VSOCK_MAX_TX_BUF_SIZE (1024 * 1024 * 16)
#define VIRTIO_VSOCK_MAX_DGRAM_SIZE (1024 * 64)
struct vsock_transport_recv_notify_data;
struct vsock_transport_send_notify_data;
struct sockaddr_vm;
struct vsock_sock;
enum {
VSOCK_VQ_CTRL = 0,
VSOCK_VQ_RX = 1, /* for host to guest data */
VSOCK_VQ_TX = 2, /* for guest to host data */
VSOCK_VQ_MAX = 3,
};
/* virtio transport socket state */
struct virtio_transport {
struct virtio_transport_pkt_ops *ops;
struct vsock_sock *vsk;
u32 buf_size;
u32 buf_size_min;
u32 buf_size_max;
struct mutex tx_lock;
struct mutex rx_lock;
struct list_head rx_queue;
u32 rx_bytes;
/* Protected by trans->tx_lock */
u32 tx_cnt;
u32 buf_alloc;
u32 peer_fwd_cnt;
u32 peer_buf_alloc;
/* Protected by trans->rx_lock */
u32 fwd_cnt;
/* Protected by sk_lock */
u16 dgram_id;
struct list_head incomplete_dgrams; /* dgram fragments */
};
struct virtio_vsock_pkt {
struct virtio_vsock_hdr hdr;
struct virtio_transport *trans;
struct work_struct work;
struct list_head list;
void *buf;
u32 len;
u32 off;
};
struct virtio_vsock_pkt_info {
u32 remote_cid, remote_port;
struct msghdr *msg;
u32 pkt_len;
u16 type;
u16 op;
u32 flags;
u16 dgram_id;
u16 dgram_len;
};
struct virtio_transport_pkt_ops {
int (*send_pkt)(struct vsock_sock *vsk,
struct virtio_vsock_pkt_info *info);
};
void virtio_vsock_dumppkt(const char *func,
const struct virtio_vsock_pkt *pkt);
struct sock *
virtio_transport_get_pending(struct sock *listener,
struct virtio_vsock_pkt *pkt);
struct virtio_vsock_pkt *
virtio_transport_alloc_pkt(struct vsock_sock *vsk,
struct virtio_vsock_pkt_info *info,
size_t len,
u32 src_cid,
u32 src_port,
u32 dst_cid,
u32 dst_port);
ssize_t
virtio_transport_stream_dequeue(struct vsock_sock *vsk,
struct msghdr *msg,
size_t len,
int type);
int
virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
struct msghdr *msg,
size_t len, int flags);
s64 virtio_transport_stream_has_data(struct vsock_sock *vsk);
s64 virtio_transport_stream_has_space(struct vsock_sock *vsk);
int virtio_transport_do_socket_init(struct vsock_sock *vsk,
struct vsock_sock *psk);
u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk);
u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk);
u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk);
void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val);
void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val);
void virtio_transport_set_max_buffer_size(struct vsock_sock *vs, u64 val);
int
virtio_transport_notify_poll_in(struct vsock_sock *vsk,
size_t target,
bool *data_ready_now);
int
virtio_transport_notify_poll_out(struct vsock_sock *vsk,
size_t target,
bool *space_available_now);
int virtio_transport_notify_recv_init(struct vsock_sock *vsk,
size_t target, struct vsock_transport_recv_notify_data *data);
int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk,
size_t target, struct vsock_transport_recv_notify_data *data);
int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk,
size_t target, struct vsock_transport_recv_notify_data *data);
int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk,
size_t target, ssize_t copied, bool data_read,
struct vsock_transport_recv_notify_data *data);
int virtio_transport_notify_send_init(struct vsock_sock *vsk,
struct vsock_transport_send_notify_data *data);
int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk,
struct vsock_transport_send_notify_data *data);
int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk,
struct vsock_transport_send_notify_data *data);
int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk,
ssize_t written, struct vsock_transport_send_notify_data *data);
u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk);
bool virtio_transport_stream_is_active(struct vsock_sock *vsk);
bool virtio_transport_stream_allow(u32 cid, u32 port);
int virtio_transport_dgram_bind(struct vsock_sock *vsk,
struct sockaddr_vm *addr);
bool virtio_transport_dgram_allow(u32 cid, u32 port);
int virtio_transport_connect(struct vsock_sock *vsk);
int virtio_transport_shutdown(struct vsock_sock *vsk, int mode);
void virtio_transport_release(struct vsock_sock *vsk);
ssize_t
virtio_transport_stream_enqueue(struct vsock_sock *vsk,
struct msghdr *msg,
size_t len);
int
virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
struct sockaddr_vm *remote_addr,
struct msghdr *msg,
size_t len);
void virtio_transport_destruct(struct vsock_sock *vsk);
void virtio_transport_recv_pkt(struct virtio_vsock_pkt *pkt);
void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt);
void virtio_transport_inc_tx_pkt(struct virtio_vsock_pkt *pkt);
void virtio_transport_dec_tx_pkt(struct virtio_vsock_pkt *pkt);
u32 virtio_transport_get_credit(struct virtio_transport *trans, u32 wanted);
void virtio_transport_put_credit(struct virtio_transport *trans, u32 credit);
#endif /* _LINUX_VIRTIO_VSOCK_H */

2
include/net/af_vsock.h
View File

@ -175,10 +175,8 @@ void vsock_insert_connected(struct vsock_sock *vsk);
void vsock_remove_bound(struct vsock_sock *vsk);
void vsock_remove_connected(struct vsock_sock *vsk);
struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr);
struct sock *vsock_find_unbound_socket(struct sockaddr_vm *addr);
struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
struct sockaddr_vm *dst);
void vsock_for_each_connected_socket(void (*fn)(struct sock *sk));
int vsock_bind_dgram_generic(struct vsock_sock *vsk, struct sockaddr_vm *addr);
#endif /* __AF_VSOCK_H__ */

1
include/uapi/linux/virtio_ids.h
View File

@ -39,7 +39,6 @@
#define VIRTIO_ID_9P 9 /* 9p virtio console */
#define VIRTIO_ID_RPROC_SERIAL 11 /* virtio remoteproc serial link */
#define VIRTIO_ID_CAIF 12 /* Virtio caif */
#define VIRTIO_ID_VSOCK 13 /* virtio vsock transport */
#define VIRTIO_ID_GPU 16 /* virtio GPU */
#define VIRTIO_ID_INPUT 18 /* virtio input */

89
include/uapi/linux/virtio_vsock.h
View File

@ -1,89 +0,0 @@
/*
* This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
* anyone can use the definitions to implement compatible drivers/servers:
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of IBM nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Copyright (C) Red Hat, Inc., 2013-2015
* Copyright (C) Asias He <asias@redhat.com>, 2013
* Copyright (C) Stefan Hajnoczi <stefanha@redhat.com>, 2015
*/
#ifndef _UAPI_LINUX_VIRTIO_VSOCK_H
#define _UAPI_LINUX_VIRTIO_VOSCK_H
#include <linux/types.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_config.h>
struct virtio_vsock_config {
__le32 guest_cid;
__le32 max_virtqueue_pairs;
};
struct virtio_vsock_hdr {
__le32 src_cid;
__le32 src_port;
__le32 dst_cid;
__le32 dst_port;
__le32 len;
__le16 type; /* enum virtio_vsock_type */
__le16 op; /* enum virtio_vsock_op */
__le32 flags;
__le32 buf_alloc;
__le32 fwd_cnt;
};
enum virtio_vsock_type {
VIRTIO_VSOCK_TYPE_STREAM = 1,
VIRTIO_VSOCK_TYPE_DGRAM = 2,
};
enum virtio_vsock_op {
VIRTIO_VSOCK_OP_INVALID = 0,
/* Connect operations */
VIRTIO_VSOCK_OP_REQUEST = 1,
VIRTIO_VSOCK_OP_RESPONSE = 2,
VIRTIO_VSOCK_OP_ACK = 3,
VIRTIO_VSOCK_OP_RST = 4,
VIRTIO_VSOCK_OP_SHUTDOWN = 5,
/* To send payload */
VIRTIO_VSOCK_OP_RW = 6,
/* Tell the peer our credit info */
VIRTIO_VSOCK_OP_CREDIT_UPDATE = 7,
/* Request the peer to send the credit info to us */
VIRTIO_VSOCK_OP_CREDIT_REQUEST = 8,
};
/* VIRTIO_VSOCK_OP_SHUTDOWN flags values */
enum virtio_vsock_shutdown {
VIRTIO_VSOCK_SHUTDOWN_RCV = 1,
VIRTIO_VSOCK_SHUTDOWN_SEND = 2,
};
#endif /* _UAPI_LINUX_VIRTIO_VSOCK_H */

18
net/vmw_vsock/Kconfig
View File

@ -26,21 +26,3 @@ config VMWARE_VMCI_VSOCKETS
To compile this driver as a module, choose M here: the module
will be called vmw_vsock_vmci_transport. If unsure, say N.
config VIRTIO_VSOCKETS
tristate "virtio transport for Virtual Sockets"
depends on VSOCKETS && VIRTIO
select VIRTIO_VSOCKETS_COMMON
help
This module implements a virtio transport for Virtual Sockets.
Enable this transport if your Virtual Machine runs on Qemu/KVM.
To compile this driver as a module, choose M here: the module
will be called virtio_vsock_transport. If unsure, say N.
config VIRTIO_VSOCKETS_COMMON
tristate
---help---
This option is selected by any driver which needs to access
the virtio_vsock.

2
net/vmw_vsock/Makefile
View File

@ -1,7 +1,5 @@
obj-$(CONFIG_VSOCKETS) += vsock.o
obj-$(CONFIG_VMWARE_VMCI_VSOCKETS) += vmw_vsock_vmci_transport.o
obj-$(CONFIG_VIRTIO_VSOCKETS) += virtio_transport.o
obj-$(CONFIG_VIRTIO_VSOCKETS_COMMON) += virtio_transport_common.o
vsock-y += af_vsock.o vsock_addr.o

70
net/vmw_vsock/af_vsock.c
View File

@ -223,17 +223,6 @@ static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
return NULL;
}
static struct sock *__vsock_find_unbound_socket(struct sockaddr_vm *addr)
{
struct vsock_sock *vsk;
list_for_each_entry(vsk, vsock_unbound_sockets, bound_table)
if (addr->svm_port == vsk->local_addr.svm_port)
return sk_vsock(vsk);
return NULL;
}
static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src,
struct sockaddr_vm *dst)
{
@ -309,21 +298,6 @@ struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr)
}
EXPORT_SYMBOL_GPL(vsock_find_bound_socket);
struct sock *vsock_find_unbound_socket(struct sockaddr_vm *addr)
{
struct sock *sk;
spin_lock_bh(&vsock_table_lock);
sk = __vsock_find_unbound_socket(addr);
if (sk)
sock_hold(sk);
spin_unlock_bh(&vsock_table_lock);
return sk;
}
EXPORT_SYMBOL_GPL(vsock_find_unbound_socket);
struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
struct sockaddr_vm *dst)
{
@ -558,50 +532,6 @@ static int __vsock_bind_stream(struct vsock_sock *vsk,
return 0;
}
int vsock_bind_dgram_generic(struct vsock_sock *vsk, struct sockaddr_vm *addr)
{
static u32 port = LAST_RESERVED_PORT + 1;
struct sockaddr_vm new_addr;
vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port);
if (addr->svm_port == VMADDR_PORT_ANY) {
bool found = false;
unsigned int i;
for (i = 0; i < MAX_PORT_RETRIES; i++) {
if (port <= LAST_RESERVED_PORT)
port = LAST_RESERVED_PORT + 1;
new_addr.svm_port = port++;
if (!__vsock_find_unbound_socket(&new_addr)) {
found = true;
break;
}
}
if (!found)
return -EADDRNOTAVAIL;
} else {
/* If port is in reserved range, ensure caller
* has necessary privileges.
*/
if (addr->svm_port <= LAST_RESERVED_PORT &&
!capable(CAP_NET_BIND_SERVICE)) {
return -EACCES;
}
if (__vsock_find_unbound_socket(&new_addr))
return -EADDRINUSE;
}
vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port);
return 0;
}
EXPORT_SYMBOL_GPL(vsock_bind_dgram_generic);
static int __vsock_bind_dgram(struct vsock_sock *vsk,
struct sockaddr_vm *addr)
{

466
net/vmw_vsock/virtio_transport.c
View File

@ -1,466 +0,0 @@
/*
* 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/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 */
static void virtio_vsock_rx_fill(struct virtio_vsock *vsock);
struct virtio_vsock {
/* Virtio device */
struct virtio_device *vdev;
/* Virtio virtqueue */
struct virtqueue *vqs[VSOCK_VQ_MAX];
/* Wait queue for send pkt */
wait_queue_head_t queue_wait;
/* Work item to send pkt */
struct work_struct tx_work;
/* Work item to recv pkt */
struct work_struct rx_work;
/* Mutex to protect send pkt*/
struct mutex tx_lock;
/* Mutex to protect recv pkt*/
struct mutex rx_lock;
/* Number of recv buffers */
int rx_buf_nr;
/* Number of max recv buffers */
int rx_buf_max_nr;
/* Used for global tx buf limitation */
u32 total_tx_buf;
/* Guest context id, just like guest ip address */
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 int
virtio_transport_send_pkt(struct vsock_sock *vsk,
struct virtio_vsock_pkt_info *info)
{
u32 src_cid, src_port, dst_cid, dst_port;
int ret, in_sg = 0, out_sg = 0;
struct virtio_transport *trans;
struct virtio_vsock_pkt *pkt;
struct virtio_vsock *vsock;
struct scatterlist hdr, buf, *sgs[2];
struct virtqueue *vq;
u32 pkt_len = info->pkt_len;
DEFINE_WAIT(wait);
vsock = virtio_vsock_get();
if (!vsock)
return -ENODEV;
src_cid = virtio_transport_get_local_cid();
src_port = vsk->local_addr.svm_port;
if (!info->remote_cid) {
dst_cid = vsk->remote_addr.svm_cid;
dst_port = vsk->remote_addr.svm_port;
} else {
dst_cid = info->remote_cid;
dst_port = info->remote_port;
}
trans = vsk->trans;
vq = vsock->vqs[VSOCK_VQ_TX];
if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE)
pkt_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
pkt_len = virtio_transport_get_credit(trans, pkt_len);
/* Do not send zero length OP_RW pkt*/
if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW)
return pkt_len;
/* Respect global tx buf limitation */
mutex_lock(&vsock->tx_lock);
while (pkt_len + vsock->total_tx_buf > VIRTIO_VSOCK_MAX_TX_BUF_SIZE) {
prepare_to_wait_exclusive(&vsock->queue_wait, &wait,
TASK_UNINTERRUPTIBLE);
mutex_unlock(&vsock->tx_lock);
schedule();
mutex_lock(&vsock->tx_lock);
finish_wait(&vsock->queue_wait, &wait);
}
vsock->total_tx_buf += pkt_len;
mutex_unlock(&vsock->tx_lock);
pkt = virtio_transport_alloc_pkt(vsk, info, pkt_len,
src_cid, src_port,
dst_cid, dst_port);
if (!pkt) {
mutex_lock(&vsock->tx_lock);
vsock->total_tx_buf -= pkt_len;
mutex_unlock(&vsock->tx_lock);
virtio_transport_put_credit(trans, pkt_len);
return -ENOMEM;
}
pr_debug("%s:info->pkt_len= %d\n", __func__, info->pkt_len);
/* Will be released in virtio_transport_send_pkt_work */
sock_hold(&trans->vsk->sk);
virtio_transport_inc_tx_pkt(pkt);
/* Put pkt in the virtqueue */
sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
sgs[out_sg++] = &hdr;
if (info->msg && info->pkt_len > 0) {
sg_init_one(&buf, pkt->buf, pkt->len);
sgs[out_sg++] = &buf;
}
mutex_lock(&vsock->tx_lock);
while ((ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, pkt,
GFP_KERNEL)) < 0) {
prepare_to_wait_exclusive(&vsock->queue_wait, &wait,
TASK_UNINTERRUPTIBLE);
mutex_unlock(&vsock->tx_lock);
schedule();
mutex_lock(&vsock->tx_lock);
finish_wait(&vsock->queue_wait, &wait);
}
virtqueue_kick(vq);
mutex_unlock(&vsock->tx_lock);
return pkt_len;
}
static struct virtio_transport_pkt_ops virtio_ops = {
.send_pkt = virtio_transport_send_pkt,
};
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) {
pr_debug("%s: fail to allocate pkt\n", __func__);
goto out;
}
/* TODO: use mergeable rx buffer */
pkt->buf = kmalloc(buf_len, GFP_KERNEL);
if (!pkt->buf) {
pr_debug("%s: fail to allocate pkt->buf\n", __func__);
goto err;
}
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)
goto err;
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;
out:
virtqueue_kick(vq);
return;
err:
virtqueue_kick(vq);
virtio_transport_free_pkt(pkt);
return;
}
static void virtio_transport_send_pkt_work(struct work_struct *work)
{
struct virtio_vsock *vsock =
container_of(work, struct virtio_vsock, tx_work);
struct virtio_vsock_pkt *pkt;
bool added = false;
struct virtqueue *vq;
unsigned int len;
struct sock *sk;
vq = vsock->vqs[VSOCK_VQ_TX];
mutex_lock(&vsock->tx_lock);
do {
virtqueue_disable_cb(vq);
while ((pkt = virtqueue_get_buf(vq, &len)) != NULL) {
sk = &pkt->trans->vsk->sk;
virtio_transport_dec_tx_pkt(pkt);
/* Release refcnt taken in virtio_transport_send_pkt */
sock_put(sk);
vsock->total_tx_buf -= pkt->len;
virtio_transport_free_pkt(pkt);
added = true;
}
} while (!virtqueue_enable_cb(vq));
mutex_unlock(&vsock->tx_lock);
if (added)
wake_up(&vsock->queue_wait);
}
static void virtio_transport_recv_pkt_work(struct work_struct *work)
{
struct virtio_vsock *vsock =
container_of(work, struct virtio_vsock, rx_work);
struct virtio_vsock_pkt *pkt;
struct virtqueue *vq;
unsigned int len;
vq = vsock->vqs[VSOCK_VQ_RX];
mutex_lock(&vsock->rx_lock);
do {
virtqueue_disable_cb(vq);
while ((pkt = virtqueue_get_buf(vq, &len)) != NULL) {
pkt->len = len;
virtio_transport_recv_pkt(pkt);
vsock->rx_buf_nr--;
}
} while (!virtqueue_enable_cb(vq));
if (vsock->rx_buf_nr < vsock->rx_buf_max_nr / 2)
virtio_vsock_rx_fill(vsock);
mutex_unlock(&vsock->rx_lock);
}
static void virtio_vsock_ctrl_done(struct virtqueue *vq)
{
}
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 int
virtio_transport_socket_init(struct vsock_sock *vsk, struct vsock_sock *psk)
{
struct virtio_transport *trans;
int ret;
ret = virtio_transport_do_socket_init(vsk, psk);
if (ret)
return ret;
trans = vsk->trans;
trans->ops = &virtio_ops;
return ret;
}
static struct vsock_transport virtio_transport = {
.get_local_cid = virtio_transport_get_local_cid,
.init = virtio_transport_socket_init,
.destruct = virtio_transport_destruct,
.release = virtio_transport_release,
.connect = virtio_transport_connect,
.shutdown = virtio_transport_shutdown,
.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,
};
static int virtio_vsock_probe(struct virtio_device *vdev)
{
vq_callback_t *callbacks[] = {
virtio_vsock_ctrl_done,
virtio_vsock_rx_done,
virtio_vsock_tx_done,
};
const char *names[] = {
"ctrl",
"rx",
"tx",
};
struct virtio_vsock *vsock = NULL;
u32 guest_cid;
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 = vsock->vdev->config->find_vqs(vsock->vdev, VSOCK_VQ_MAX,
vsock->vqs, callbacks, names);
if (ret < 0)
goto out;
vdev->config->get(vdev, offsetof(struct virtio_vsock_config, guest_cid),
&guest_cid, sizeof(guest_cid));
vsock->guest_cid = le32_to_cpu(guest_cid);
pr_debug("%s:guest_cid=%d\n", __func__, vsock->guest_cid);
ret = vsock_core_init(&virtio_transport);
if (ret < 0)
goto out_vqs;
vsock->rx_buf_nr = 0;
vsock->rx_buf_max_nr = 0;
vdev->priv = the_virtio_vsock = vsock;
init_waitqueue_head(&vsock->queue_wait);
mutex_init(&vsock->tx_lock);
mutex_init(&vsock->rx_lock);
INIT_WORK(&vsock->rx_work, virtio_transport_recv_pkt_work);
INIT_WORK(&vsock->tx_work, virtio_transport_send_pkt_work);
mutex_lock(&vsock->rx_lock);
virtio_vsock_rx_fill(vsock);
mutex_unlock(&vsock->rx_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;
mutex_lock(&the_virtio_vsock_mutex);
the_virtio_vsock = NULL;
vsock_core_exit();
mutex_unlock(&the_virtio_vsock_mutex);
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);

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net/vmw_vsock/virtio_transport_common.c
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