qemu/hw/vhost_net.c
Stefan Hajnoczi 35277d14ec net: Rename vc local variables to nc
Now that VLANClientState has been renamed to NetClientState all 'vc'
local variables should be 'nc'.  Much of the code already used 'nc' but
there are places where 'vc' needs to be renamed.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
2012-08-01 13:32:10 +01:00

251 lines
6.6 KiB
C

/*
* vhost-net support
*
* Copyright Red Hat, Inc. 2010
*
* Authors:
* Michael S. Tsirkin <mst@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include "net.h"
#include "net/tap.h"
#include "virtio-net.h"
#include "vhost_net.h"
#include "qemu-error.h"
#include "config.h"
#ifdef CONFIG_VHOST_NET
#include <linux/vhost.h>
#include <sys/socket.h>
#include <linux/kvm.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/virtio_ring.h>
#include <netpacket/packet.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <stdio.h>
#include "vhost.h"
struct vhost_net {
struct vhost_dev dev;
struct vhost_virtqueue vqs[2];
int backend;
NetClientState *nc;
};
unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
{
/* Clear features not supported by host kernel. */
if (!(net->dev.features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY))) {
features &= ~(1 << VIRTIO_F_NOTIFY_ON_EMPTY);
}
if (!(net->dev.features & (1 << VIRTIO_RING_F_INDIRECT_DESC))) {
features &= ~(1 << VIRTIO_RING_F_INDIRECT_DESC);
}
if (!(net->dev.features & (1 << VIRTIO_RING_F_EVENT_IDX))) {
features &= ~(1 << VIRTIO_RING_F_EVENT_IDX);
}
if (!(net->dev.features & (1 << VIRTIO_NET_F_MRG_RXBUF))) {
features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
}
return features;
}
void vhost_net_ack_features(struct vhost_net *net, unsigned features)
{
net->dev.acked_features = net->dev.backend_features;
if (features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) {
net->dev.acked_features |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY);
}
if (features & (1 << VIRTIO_RING_F_INDIRECT_DESC)) {
net->dev.acked_features |= (1 << VIRTIO_RING_F_INDIRECT_DESC);
}
if (features & (1 << VIRTIO_RING_F_EVENT_IDX)) {
net->dev.acked_features |= (1 << VIRTIO_RING_F_EVENT_IDX);
}
if (features & (1 << VIRTIO_NET_F_MRG_RXBUF)) {
net->dev.acked_features |= (1 << VIRTIO_NET_F_MRG_RXBUF);
}
}
static int vhost_net_get_fd(NetClientState *backend)
{
switch (backend->info->type) {
case NET_CLIENT_OPTIONS_KIND_TAP:
return tap_get_fd(backend);
default:
fprintf(stderr, "vhost-net requires tap backend\n");
return -EBADFD;
}
}
struct vhost_net *vhost_net_init(NetClientState *backend, int devfd,
bool force)
{
int r;
struct vhost_net *net = g_malloc(sizeof *net);
if (!backend) {
fprintf(stderr, "vhost-net requires backend to be setup\n");
goto fail;
}
r = vhost_net_get_fd(backend);
if (r < 0) {
goto fail;
}
net->nc = backend;
net->dev.backend_features = tap_has_vnet_hdr(backend) ? 0 :
(1 << VHOST_NET_F_VIRTIO_NET_HDR);
net->backend = r;
r = vhost_dev_init(&net->dev, devfd, force);
if (r < 0) {
goto fail;
}
if (!tap_has_vnet_hdr_len(backend,
sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
net->dev.features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
}
if (~net->dev.features & net->dev.backend_features) {
fprintf(stderr, "vhost lacks feature mask %" PRIu64 " for backend\n",
(uint64_t)(~net->dev.features & net->dev.backend_features));
vhost_dev_cleanup(&net->dev);
goto fail;
}
/* Set sane init value. Override when guest acks. */
vhost_net_ack_features(net, 0);
return net;
fail:
g_free(net);
return NULL;
}
bool vhost_net_query(VHostNetState *net, VirtIODevice *dev)
{
return vhost_dev_query(&net->dev, dev);
}
int vhost_net_start(struct vhost_net *net,
VirtIODevice *dev)
{
struct vhost_vring_file file = { };
int r;
net->dev.nvqs = 2;
net->dev.vqs = net->vqs;
r = vhost_dev_enable_notifiers(&net->dev, dev);
if (r < 0) {
goto fail_notifiers;
}
if (net->dev.acked_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) {
tap_set_vnet_hdr_len(net->nc,
sizeof(struct virtio_net_hdr_mrg_rxbuf));
}
r = vhost_dev_start(&net->dev, dev);
if (r < 0) {
goto fail_start;
}
net->nc->info->poll(net->nc, false);
qemu_set_fd_handler(net->backend, NULL, NULL, NULL);
file.fd = net->backend;
for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file);
if (r < 0) {
r = -errno;
goto fail;
}
}
return 0;
fail:
file.fd = -1;
while (file.index-- > 0) {
int r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file);
assert(r >= 0);
}
net->nc->info->poll(net->nc, true);
vhost_dev_stop(&net->dev, dev);
if (net->dev.acked_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) {
tap_set_vnet_hdr_len(net->nc, sizeof(struct virtio_net_hdr));
}
fail_start:
vhost_dev_disable_notifiers(&net->dev, dev);
fail_notifiers:
return r;
}
void vhost_net_stop(struct vhost_net *net,
VirtIODevice *dev)
{
struct vhost_vring_file file = { .fd = -1 };
for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
int r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file);
assert(r >= 0);
}
net->nc->info->poll(net->nc, true);
vhost_dev_stop(&net->dev, dev);
if (net->dev.acked_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) {
tap_set_vnet_hdr_len(net->nc, sizeof(struct virtio_net_hdr));
}
vhost_dev_disable_notifiers(&net->dev, dev);
}
void vhost_net_cleanup(struct vhost_net *net)
{
vhost_dev_cleanup(&net->dev);
if (net->dev.acked_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) {
tap_set_vnet_hdr_len(net->nc, sizeof(struct virtio_net_hdr));
}
g_free(net);
}
#else
struct vhost_net *vhost_net_init(NetClientState *backend, int devfd,
bool force)
{
error_report("vhost-net support is not compiled in");
return NULL;
}
bool vhost_net_query(VHostNetState *net, VirtIODevice *dev)
{
return false;
}
int vhost_net_start(struct vhost_net *net,
VirtIODevice *dev)
{
return -ENOSYS;
}
void vhost_net_stop(struct vhost_net *net,
VirtIODevice *dev)
{
}
void vhost_net_cleanup(struct vhost_net *net)
{
}
unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
{
return features;
}
void vhost_net_ack_features(struct vhost_net *net, unsigned features)
{
}
#endif