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xemu/hw/net/vhost_net.c
Maxime Coquelin 6dcdd06e3b spec/vhost-user spec: Add IOMMU support 
This patch specifies and implements the master/slave communication
to support device IOTLB in slave.

The vhost_iotlb_msg structure introduced for kernel backends is
re-used, making the design close between the two backends.

An exception is the use of the secondary channel to enable the
slave to send IOTLB miss requests to the master.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2017-06-02 18:57:17 +03:00

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/*
* 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 "hw/virtio/virtio-net.h"
#include "net/vhost_net.h"
#include "qemu/error-report.h"
#ifdef CONFIG_VHOST_NET
#include <linux/vhost.h>
#include <sys/socket.h>
#include <linux/kvm.h>
#include <netpacket/packet.h>
#include <net/ethernet.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"
struct vhost_net {
struct vhost_dev dev;
struct vhost_virtqueue vqs[2];
int backend;
NetClientState *nc;
};
/* 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,
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,
/* 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;
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);
}
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 -EBADFD;
}
}
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;
if (!options->net_backend) {
fprintf(stderr, "vhost-net requires net backend to be setup\n");
goto fail;
}
net->nc = options->net_backend;
net->dev.max_queues = 1;
net->dev.nvqs = 2;
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);
if (r < 0) {
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. */
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;
}
}
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;
net->dev.nvqs = 2;
net->dev.vqs = net->vqs;
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) {
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) {
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);
int r, e, i;
if (!k->set_guest_notifiers) {
error_report("binding does not support guest notifiers");
return -ENOSYS;
}
for (i = 0; i < total_queues; i++) {
struct vhost_net *net;
net = get_vhost_net(ncs[i].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++) {
r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);
if (r < 0) {
goto err_start;
}
if (ncs[i].peer->vring_enable) {
/* restore vring enable state */
r = vhost_set_vring_enable(ncs[i].peer, ncs[i].peer->vring_enable);
if (r < 0) {
goto err_start;
}
}
}
return 0;
err_start:
while (--i >= 0) {
vhost_net_stop_one(get_vhost_net(ncs[i].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;
case NET_CLIENT_DRIVER_VHOST_USER:
vhost_net = vhost_user_get_vhost_net(nc);
assert(vhost_net);
break;
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);
}
#else
uint64_t vhost_net_get_max_queues(VHostNetState *net)
{
return 1;
}
struct vhost_net *vhost_net_init(VhostNetOptions *options)
{
error_report("vhost-net support is not compiled in");
return NULL;
}
int vhost_net_start(VirtIODevice *dev,
NetClientState *ncs,
int total_queues)
{
return -ENOSYS;
}
void vhost_net_stop(VirtIODevice *dev,
NetClientState *ncs,
int total_queues)
{
}
void vhost_net_cleanup(struct vhost_net *net)
{
}
uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
{
return features;
}
void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
{
}
uint64_t vhost_net_get_acked_features(VHostNetState *net)
{
return 0;
}
bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
{
return false;
}
void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
int idx, bool mask)
{
}
int vhost_net_notify_migration_done(struct vhost_net *net, char* mac_addr)
{
return -1;
}
VHostNetState *get_vhost_net(NetClientState *nc)
{
return 0;
}
int vhost_set_vring_enable(NetClientState *nc, int enable)
{
return 0;
}
int vhost_net_set_mtu(struct vhost_net *net, uint16_t mtu)
{
return 0;
}
#endif
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