488 lines
13 KiB
C
488 lines
13 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 "qemu/osdep.h"
|
|
#include "net/net.h"
|
|
#include "net/tap.h"
|
|
#include "net/vhost-user.h"
|
|
#include "net/vhost-vdpa.h"
|
|
|
|
#include "standard-headers/linux/vhost_types.h"
|
|
#include "hw/virtio/virtio-net.h"
|
|
#include "net/vhost_net.h"
|
|
#include "qapi/error.h"
|
|
#include "qemu/error-report.h"
|
|
#include "qemu/main-loop.h"
|
|
|
|
#include <sys/socket.h>
|
|
#include <net/if.h>
|
|
#include <netinet/in.h>
|
|
|
|
|
|
#include "standard-headers/linux/virtio_ring.h"
|
|
#include "hw/virtio/vhost.h"
|
|
#include "hw/virtio/virtio-bus.h"
|
|
|
|
|
|
/* Features supported by host kernel. */
|
|
static const int kernel_feature_bits[] = {
|
|
VIRTIO_F_NOTIFY_ON_EMPTY,
|
|
VIRTIO_RING_F_INDIRECT_DESC,
|
|
VIRTIO_RING_F_EVENT_IDX,
|
|
VIRTIO_NET_F_MRG_RXBUF,
|
|
VIRTIO_F_VERSION_1,
|
|
VIRTIO_NET_F_MTU,
|
|
VIRTIO_F_IOMMU_PLATFORM,
|
|
VIRTIO_F_RING_PACKED,
|
|
VIRTIO_NET_F_HASH_REPORT,
|
|
VHOST_INVALID_FEATURE_BIT
|
|
};
|
|
|
|
/* Features supported by others. */
|
|
static const int user_feature_bits[] = {
|
|
VIRTIO_F_NOTIFY_ON_EMPTY,
|
|
VIRTIO_RING_F_INDIRECT_DESC,
|
|
VIRTIO_RING_F_EVENT_IDX,
|
|
|
|
VIRTIO_F_ANY_LAYOUT,
|
|
VIRTIO_F_VERSION_1,
|
|
VIRTIO_NET_F_CSUM,
|
|
VIRTIO_NET_F_GUEST_CSUM,
|
|
VIRTIO_NET_F_GSO,
|
|
VIRTIO_NET_F_GUEST_TSO4,
|
|
VIRTIO_NET_F_GUEST_TSO6,
|
|
VIRTIO_NET_F_GUEST_ECN,
|
|
VIRTIO_NET_F_GUEST_UFO,
|
|
VIRTIO_NET_F_HOST_TSO4,
|
|
VIRTIO_NET_F_HOST_TSO6,
|
|
VIRTIO_NET_F_HOST_ECN,
|
|
VIRTIO_NET_F_HOST_UFO,
|
|
VIRTIO_NET_F_MRG_RXBUF,
|
|
VIRTIO_NET_F_MTU,
|
|
VIRTIO_F_IOMMU_PLATFORM,
|
|
VIRTIO_F_RING_PACKED,
|
|
VIRTIO_NET_F_RSS,
|
|
VIRTIO_NET_F_HASH_REPORT,
|
|
|
|
/* This bit implies RARP isn't sent by QEMU out of band */
|
|
VIRTIO_NET_F_GUEST_ANNOUNCE,
|
|
|
|
VIRTIO_NET_F_MQ,
|
|
|
|
VHOST_INVALID_FEATURE_BIT
|
|
};
|
|
|
|
static const int *vhost_net_get_feature_bits(struct vhost_net *net)
|
|
{
|
|
const int *feature_bits = 0;
|
|
|
|
switch (net->nc->info->type) {
|
|
case NET_CLIENT_DRIVER_TAP:
|
|
feature_bits = kernel_feature_bits;
|
|
break;
|
|
case NET_CLIENT_DRIVER_VHOST_USER:
|
|
feature_bits = user_feature_bits;
|
|
break;
|
|
#ifdef CONFIG_VHOST_NET_VDPA
|
|
case NET_CLIENT_DRIVER_VHOST_VDPA:
|
|
feature_bits = vdpa_feature_bits;
|
|
break;
|
|
#endif
|
|
default:
|
|
error_report("Feature bits not defined for this type: %d",
|
|
net->nc->info->type);
|
|
break;
|
|
}
|
|
|
|
return feature_bits;
|
|
}
|
|
|
|
uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
|
|
{
|
|
return vhost_get_features(&net->dev, vhost_net_get_feature_bits(net),
|
|
features);
|
|
}
|
|
int vhost_net_get_config(struct vhost_net *net, uint8_t *config,
|
|
uint32_t config_len)
|
|
{
|
|
return vhost_dev_get_config(&net->dev, config, config_len, NULL);
|
|
}
|
|
int vhost_net_set_config(struct vhost_net *net, const uint8_t *data,
|
|
uint32_t offset, uint32_t size, uint32_t flags)
|
|
{
|
|
return vhost_dev_set_config(&net->dev, data, offset, size, flags);
|
|
}
|
|
|
|
void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
|
|
{
|
|
net->dev.acked_features = net->dev.backend_features;
|
|
vhost_ack_features(&net->dev, vhost_net_get_feature_bits(net), features);
|
|
}
|
|
|
|
uint64_t vhost_net_get_max_queues(VHostNetState *net)
|
|
{
|
|
return net->dev.max_queues;
|
|
}
|
|
|
|
uint64_t vhost_net_get_acked_features(VHostNetState *net)
|
|
{
|
|
return net->dev.acked_features;
|
|
}
|
|
|
|
static int vhost_net_get_fd(NetClientState *backend)
|
|
{
|
|
switch (backend->info->type) {
|
|
case NET_CLIENT_DRIVER_TAP:
|
|
return tap_get_fd(backend);
|
|
default:
|
|
fprintf(stderr, "vhost-net requires tap backend\n");
|
|
return -ENOSYS;
|
|
}
|
|
}
|
|
|
|
struct vhost_net *vhost_net_init(VhostNetOptions *options)
|
|
{
|
|
int r;
|
|
bool backend_kernel = options->backend_type == VHOST_BACKEND_TYPE_KERNEL;
|
|
struct vhost_net *net = g_new0(struct vhost_net, 1);
|
|
uint64_t features = 0;
|
|
Error *local_err = NULL;
|
|
|
|
if (!options->net_backend) {
|
|
fprintf(stderr, "vhost-net requires net backend to be setup\n");
|
|
goto fail;
|
|
}
|
|
net->nc = options->net_backend;
|
|
net->dev.nvqs = options->nvqs;
|
|
|
|
net->dev.max_queues = 1;
|
|
net->dev.vqs = net->vqs;
|
|
|
|
if (backend_kernel) {
|
|
r = vhost_net_get_fd(options->net_backend);
|
|
if (r < 0) {
|
|
goto fail;
|
|
}
|
|
net->dev.backend_features = qemu_has_vnet_hdr(options->net_backend)
|
|
? 0 : (1ULL << VHOST_NET_F_VIRTIO_NET_HDR);
|
|
net->backend = r;
|
|
net->dev.protocol_features = 0;
|
|
} else {
|
|
net->dev.backend_features = 0;
|
|
net->dev.protocol_features = 0;
|
|
net->backend = -1;
|
|
|
|
/* vhost-user needs vq_index to initiate a specific queue pair */
|
|
net->dev.vq_index = net->nc->queue_index * net->dev.nvqs;
|
|
}
|
|
|
|
r = vhost_dev_init(&net->dev, options->opaque,
|
|
options->backend_type, options->busyloop_timeout,
|
|
&local_err);
|
|
if (r < 0) {
|
|
error_report_err(local_err);
|
|
goto fail;
|
|
}
|
|
if (backend_kernel) {
|
|
if (!qemu_has_vnet_hdr_len(options->net_backend,
|
|
sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
|
|
net->dev.features &= ~(1ULL << 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));
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/* Set sane init value. Override when guest acks. */
|
|
#ifdef CONFIG_VHOST_NET_USER
|
|
if (net->nc->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
|
|
features = vhost_user_get_acked_features(net->nc);
|
|
if (~net->dev.features & features) {
|
|
fprintf(stderr, "vhost lacks feature mask %" PRIu64
|
|
" for backend\n",
|
|
(uint64_t)(~net->dev.features & features));
|
|
goto fail;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
vhost_net_ack_features(net, features);
|
|
|
|
return net;
|
|
|
|
fail:
|
|
vhost_dev_cleanup(&net->dev);
|
|
g_free(net);
|
|
return NULL;
|
|
}
|
|
|
|
static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index)
|
|
{
|
|
net->dev.vq_index = vq_index;
|
|
}
|
|
|
|
static int vhost_net_start_one(struct vhost_net *net,
|
|
VirtIODevice *dev)
|
|
{
|
|
struct vhost_vring_file file = { };
|
|
int r;
|
|
|
|
r = vhost_dev_enable_notifiers(&net->dev, dev);
|
|
if (r < 0) {
|
|
goto fail_notifiers;
|
|
}
|
|
|
|
r = vhost_dev_start(&net->dev, dev);
|
|
if (r < 0) {
|
|
goto fail_start;
|
|
}
|
|
|
|
if (net->nc->info->poll) {
|
|
net->nc->info->poll(net->nc, false);
|
|
}
|
|
|
|
if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
|
|
qemu_set_fd_handler(net->backend, NULL, NULL, NULL);
|
|
file.fd = net->backend;
|
|
for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
|
|
if (!virtio_queue_enabled(dev, net->dev.vq_index +
|
|
file.index)) {
|
|
/* Queue might not be ready for start */
|
|
continue;
|
|
}
|
|
r = vhost_net_set_backend(&net->dev, &file);
|
|
if (r < 0) {
|
|
r = -errno;
|
|
goto fail;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
fail:
|
|
file.fd = -1;
|
|
if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
|
|
while (file.index-- > 0) {
|
|
if (!virtio_queue_enabled(dev, net->dev.vq_index +
|
|
file.index)) {
|
|
/* Queue might not be ready for start */
|
|
continue;
|
|
}
|
|
int r = vhost_net_set_backend(&net->dev, &file);
|
|
assert(r >= 0);
|
|
}
|
|
}
|
|
if (net->nc->info->poll) {
|
|
net->nc->info->poll(net->nc, true);
|
|
}
|
|
vhost_dev_stop(&net->dev, dev);
|
|
fail_start:
|
|
vhost_dev_disable_notifiers(&net->dev, dev);
|
|
fail_notifiers:
|
|
return r;
|
|
}
|
|
|
|
static void vhost_net_stop_one(struct vhost_net *net,
|
|
VirtIODevice *dev)
|
|
{
|
|
struct vhost_vring_file file = { .fd = -1 };
|
|
|
|
if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
|
|
for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
|
|
int r = vhost_net_set_backend(&net->dev, &file);
|
|
assert(r >= 0);
|
|
}
|
|
}
|
|
if (net->nc->info->poll) {
|
|
net->nc->info->poll(net->nc, true);
|
|
}
|
|
vhost_dev_stop(&net->dev, dev);
|
|
vhost_dev_disable_notifiers(&net->dev, dev);
|
|
}
|
|
|
|
int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
|
|
int total_queues)
|
|
{
|
|
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
|
|
VirtioBusState *vbus = VIRTIO_BUS(qbus);
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
|
|
struct vhost_net *net;
|
|
int r, e, i;
|
|
NetClientState *peer;
|
|
|
|
if (!k->set_guest_notifiers) {
|
|
error_report("binding does not support guest notifiers");
|
|
return -ENOSYS;
|
|
}
|
|
|
|
for (i = 0; i < total_queues; i++) {
|
|
|
|
peer = qemu_get_peer(ncs, i);
|
|
net = get_vhost_net(peer);
|
|
vhost_net_set_vq_index(net, i * 2);
|
|
|
|
/* Suppress the masking guest notifiers on vhost user
|
|
* because vhost user doesn't interrupt masking/unmasking
|
|
* properly.
|
|
*/
|
|
if (net->nc->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
|
|
dev->use_guest_notifier_mask = false;
|
|
}
|
|
}
|
|
|
|
r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
|
|
if (r < 0) {
|
|
error_report("Error binding guest notifier: %d", -r);
|
|
goto err;
|
|
}
|
|
|
|
for (i = 0; i < total_queues; i++) {
|
|
peer = qemu_get_peer(ncs, i);
|
|
r = vhost_net_start_one(get_vhost_net(peer), dev);
|
|
|
|
if (r < 0) {
|
|
goto err_start;
|
|
}
|
|
|
|
if (peer->vring_enable) {
|
|
/* restore vring enable state */
|
|
r = vhost_set_vring_enable(peer, peer->vring_enable);
|
|
|
|
if (r < 0) {
|
|
goto err_start;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_start:
|
|
while (--i >= 0) {
|
|
peer = qemu_get_peer(ncs , i);
|
|
vhost_net_stop_one(get_vhost_net(peer), dev);
|
|
}
|
|
e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
|
|
if (e < 0) {
|
|
fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
|
|
fflush(stderr);
|
|
}
|
|
err:
|
|
return r;
|
|
}
|
|
|
|
void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
|
|
int total_queues)
|
|
{
|
|
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
|
|
VirtioBusState *vbus = VIRTIO_BUS(qbus);
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
|
|
int i, r;
|
|
|
|
for (i = 0; i < total_queues; i++) {
|
|
vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
|
|
}
|
|
|
|
r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
|
|
if (r < 0) {
|
|
fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
|
|
fflush(stderr);
|
|
}
|
|
assert(r >= 0);
|
|
}
|
|
|
|
void vhost_net_cleanup(struct vhost_net *net)
|
|
{
|
|
vhost_dev_cleanup(&net->dev);
|
|
}
|
|
|
|
int vhost_net_notify_migration_done(struct vhost_net *net, char* mac_addr)
|
|
{
|
|
const VhostOps *vhost_ops = net->dev.vhost_ops;
|
|
|
|
assert(vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
|
|
assert(vhost_ops->vhost_migration_done);
|
|
|
|
return vhost_ops->vhost_migration_done(&net->dev, mac_addr);
|
|
}
|
|
|
|
bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
|
|
{
|
|
return vhost_virtqueue_pending(&net->dev, idx);
|
|
}
|
|
|
|
void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
|
|
int idx, bool mask)
|
|
{
|
|
vhost_virtqueue_mask(&net->dev, dev, idx, mask);
|
|
}
|
|
|
|
VHostNetState *get_vhost_net(NetClientState *nc)
|
|
{
|
|
VHostNetState *vhost_net = 0;
|
|
|
|
if (!nc) {
|
|
return 0;
|
|
}
|
|
|
|
switch (nc->info->type) {
|
|
case NET_CLIENT_DRIVER_TAP:
|
|
vhost_net = tap_get_vhost_net(nc);
|
|
break;
|
|
#ifdef CONFIG_VHOST_NET_USER
|
|
case NET_CLIENT_DRIVER_VHOST_USER:
|
|
vhost_net = vhost_user_get_vhost_net(nc);
|
|
assert(vhost_net);
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_VHOST_NET_VDPA
|
|
case NET_CLIENT_DRIVER_VHOST_VDPA:
|
|
vhost_net = vhost_vdpa_get_vhost_net(nc);
|
|
assert(vhost_net);
|
|
break;
|
|
#endif
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return vhost_net;
|
|
}
|
|
|
|
int vhost_set_vring_enable(NetClientState *nc, int enable)
|
|
{
|
|
VHostNetState *net = get_vhost_net(nc);
|
|
const VhostOps *vhost_ops = net->dev.vhost_ops;
|
|
|
|
nc->vring_enable = enable;
|
|
|
|
if (vhost_ops && vhost_ops->vhost_set_vring_enable) {
|
|
return vhost_ops->vhost_set_vring_enable(&net->dev, enable);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int vhost_net_set_mtu(struct vhost_net *net, uint16_t mtu)
|
|
{
|
|
const VhostOps *vhost_ops = net->dev.vhost_ops;
|
|
|
|
if (!vhost_ops->vhost_net_set_mtu) {
|
|
return 0;
|
|
}
|
|
|
|
return vhost_ops->vhost_net_set_mtu(&net->dev, mtu);
|
|
}
|