505 lines
12 KiB
C
505 lines
12 KiB
C
/*
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* vhost-net support
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*
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* Copyright Red Hat, Inc. 2010
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*
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* Authors:
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* Michael S. Tsirkin <mst@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu/osdep.h"
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#include "net/net.h"
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#include "net/tap.h"
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#include "net/vhost-user.h"
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#include "hw/virtio/virtio-net.h"
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#include "net/vhost_net.h"
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#include "qemu/error-report.h"
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#ifdef CONFIG_VHOST_NET
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#include <linux/vhost.h>
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#include <sys/socket.h>
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#include <linux/kvm.h>
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#include <netpacket/packet.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include "standard-headers/linux/virtio_ring.h"
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#include "hw/virtio/vhost.h"
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#include "hw/virtio/virtio-bus.h"
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struct vhost_net {
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struct vhost_dev dev;
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struct vhost_virtqueue vqs[2];
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int backend;
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NetClientState *nc;
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};
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/* Features supported by host kernel. */
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static const int kernel_feature_bits[] = {
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VIRTIO_F_NOTIFY_ON_EMPTY,
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VIRTIO_RING_F_INDIRECT_DESC,
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VIRTIO_RING_F_EVENT_IDX,
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VIRTIO_NET_F_MRG_RXBUF,
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VIRTIO_F_VERSION_1,
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VHOST_INVALID_FEATURE_BIT
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};
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/* Features supported by others. */
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static const int user_feature_bits[] = {
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VIRTIO_F_NOTIFY_ON_EMPTY,
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VIRTIO_RING_F_INDIRECT_DESC,
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VIRTIO_RING_F_EVENT_IDX,
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VIRTIO_F_ANY_LAYOUT,
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VIRTIO_F_VERSION_1,
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VIRTIO_NET_F_CSUM,
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VIRTIO_NET_F_GUEST_CSUM,
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VIRTIO_NET_F_GSO,
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VIRTIO_NET_F_GUEST_TSO4,
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VIRTIO_NET_F_GUEST_TSO6,
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VIRTIO_NET_F_GUEST_ECN,
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VIRTIO_NET_F_GUEST_UFO,
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VIRTIO_NET_F_HOST_TSO4,
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VIRTIO_NET_F_HOST_TSO6,
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VIRTIO_NET_F_HOST_ECN,
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VIRTIO_NET_F_HOST_UFO,
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VIRTIO_NET_F_MRG_RXBUF,
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/* This bit implies RARP isn't sent by QEMU out of band */
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VIRTIO_NET_F_GUEST_ANNOUNCE,
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VIRTIO_NET_F_MQ,
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VHOST_INVALID_FEATURE_BIT
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};
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static const int *vhost_net_get_feature_bits(struct vhost_net *net)
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{
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const int *feature_bits = 0;
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switch (net->nc->info->type) {
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case NET_CLIENT_DRIVER_TAP:
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feature_bits = kernel_feature_bits;
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break;
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case NET_CLIENT_DRIVER_VHOST_USER:
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feature_bits = user_feature_bits;
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break;
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default:
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error_report("Feature bits not defined for this type: %d",
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net->nc->info->type);
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break;
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}
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return feature_bits;
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}
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uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
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{
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return vhost_get_features(&net->dev, vhost_net_get_feature_bits(net),
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features);
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}
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void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
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{
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net->dev.acked_features = net->dev.backend_features;
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vhost_ack_features(&net->dev, vhost_net_get_feature_bits(net), features);
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}
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uint64_t vhost_net_get_max_queues(VHostNetState *net)
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{
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return net->dev.max_queues;
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}
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uint64_t vhost_net_get_acked_features(VHostNetState *net)
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{
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return net->dev.acked_features;
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}
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static int vhost_net_get_fd(NetClientState *backend)
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{
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switch (backend->info->type) {
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case NET_CLIENT_DRIVER_TAP:
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return tap_get_fd(backend);
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default:
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fprintf(stderr, "vhost-net requires tap backend\n");
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return -EBADFD;
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}
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}
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struct vhost_net *vhost_net_init(VhostNetOptions *options)
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{
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int r;
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bool backend_kernel = options->backend_type == VHOST_BACKEND_TYPE_KERNEL;
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struct vhost_net *net = g_new0(struct vhost_net, 1);
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uint64_t features = 0;
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if (!options->net_backend) {
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fprintf(stderr, "vhost-net requires net backend to be setup\n");
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goto fail;
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}
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net->nc = options->net_backend;
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net->dev.max_queues = 1;
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net->dev.nvqs = 2;
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net->dev.vqs = net->vqs;
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if (backend_kernel) {
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r = vhost_net_get_fd(options->net_backend);
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if (r < 0) {
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goto fail;
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}
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net->dev.backend_features = qemu_has_vnet_hdr(options->net_backend)
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? 0 : (1ULL << VHOST_NET_F_VIRTIO_NET_HDR);
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net->backend = r;
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net->dev.protocol_features = 0;
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} else {
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net->dev.backend_features = 0;
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net->dev.protocol_features = 0;
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net->backend = -1;
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/* vhost-user needs vq_index to initiate a specific queue pair */
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net->dev.vq_index = net->nc->queue_index * net->dev.nvqs;
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}
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r = vhost_dev_init(&net->dev, options->opaque,
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options->backend_type, options->busyloop_timeout);
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if (r < 0) {
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goto fail;
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}
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if (backend_kernel) {
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if (!qemu_has_vnet_hdr_len(options->net_backend,
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sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
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net->dev.features &= ~(1ULL << VIRTIO_NET_F_MRG_RXBUF);
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}
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if (~net->dev.features & net->dev.backend_features) {
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fprintf(stderr, "vhost lacks feature mask %" PRIu64
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" for backend\n",
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(uint64_t)(~net->dev.features & net->dev.backend_features));
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goto fail;
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}
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}
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/* Set sane init value. Override when guest acks. */
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if (net->nc->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
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features = vhost_user_get_acked_features(net->nc);
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if (~net->dev.features & features) {
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fprintf(stderr, "vhost lacks feature mask %" PRIu64
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" for backend\n",
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(uint64_t)(~net->dev.features & features));
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goto fail;
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}
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}
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vhost_net_ack_features(net, features);
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return net;
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fail:
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vhost_dev_cleanup(&net->dev);
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g_free(net);
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return NULL;
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}
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static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index)
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{
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net->dev.vq_index = vq_index;
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}
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static int vhost_net_start_one(struct vhost_net *net,
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VirtIODevice *dev)
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{
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struct vhost_vring_file file = { };
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int r;
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net->dev.nvqs = 2;
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net->dev.vqs = net->vqs;
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r = vhost_dev_enable_notifiers(&net->dev, dev);
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if (r < 0) {
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goto fail_notifiers;
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}
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r = vhost_dev_start(&net->dev, dev);
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if (r < 0) {
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goto fail_start;
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}
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if (net->nc->info->poll) {
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net->nc->info->poll(net->nc, false);
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}
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if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
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qemu_set_fd_handler(net->backend, NULL, NULL, NULL);
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file.fd = net->backend;
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for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
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r = vhost_net_set_backend(&net->dev, &file);
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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}
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}
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return 0;
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fail:
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file.fd = -1;
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if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
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while (file.index-- > 0) {
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int r = vhost_net_set_backend(&net->dev, &file);
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assert(r >= 0);
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}
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}
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if (net->nc->info->poll) {
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net->nc->info->poll(net->nc, true);
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}
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vhost_dev_stop(&net->dev, dev);
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fail_start:
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vhost_dev_disable_notifiers(&net->dev, dev);
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fail_notifiers:
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return r;
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}
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static void vhost_net_stop_one(struct vhost_net *net,
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VirtIODevice *dev)
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{
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struct vhost_vring_file file = { .fd = -1 };
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if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
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for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
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int r = vhost_net_set_backend(&net->dev, &file);
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assert(r >= 0);
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}
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}
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if (net->nc->info->poll) {
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net->nc->info->poll(net->nc, true);
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}
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vhost_dev_stop(&net->dev, dev);
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vhost_dev_disable_notifiers(&net->dev, dev);
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}
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int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
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int total_queues)
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{
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BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
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VirtioBusState *vbus = VIRTIO_BUS(qbus);
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VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
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int r, e, i;
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if (!k->set_guest_notifiers) {
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error_report("binding does not support guest notifiers");
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return -ENOSYS;
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}
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for (i = 0; i < total_queues; i++) {
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struct vhost_net *net;
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net = get_vhost_net(ncs[i].peer);
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vhost_net_set_vq_index(net, i * 2);
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/* Suppress the masking guest notifiers on vhost user
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* because vhost user doesn't interrupt masking/unmasking
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* properly.
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*/
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if (net->nc->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
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dev->use_guest_notifier_mask = false;
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}
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}
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r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
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if (r < 0) {
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error_report("Error binding guest notifier: %d", -r);
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goto err;
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}
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for (i = 0; i < total_queues; i++) {
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r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);
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if (r < 0) {
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goto err_start;
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}
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if (ncs[i].peer->vring_enable) {
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/* restore vring enable state */
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r = vhost_set_vring_enable(ncs[i].peer, ncs[i].peer->vring_enable);
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if (r < 0) {
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goto err_start;
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}
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}
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}
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return 0;
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err_start:
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while (--i >= 0) {
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vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
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}
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e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
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if (e < 0) {
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fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
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fflush(stderr);
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}
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err:
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return r;
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}
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void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
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int total_queues)
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{
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BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
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VirtioBusState *vbus = VIRTIO_BUS(qbus);
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VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
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int i, r;
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for (i = 0; i < total_queues; i++) {
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vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
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}
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r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
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if (r < 0) {
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fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
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fflush(stderr);
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}
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assert(r >= 0);
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}
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void vhost_net_cleanup(struct vhost_net *net)
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{
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vhost_dev_cleanup(&net->dev);
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}
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int vhost_net_notify_migration_done(struct vhost_net *net, char* mac_addr)
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{
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const VhostOps *vhost_ops = net->dev.vhost_ops;
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assert(vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
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assert(vhost_ops->vhost_migration_done);
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return vhost_ops->vhost_migration_done(&net->dev, mac_addr);
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}
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bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
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{
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return vhost_virtqueue_pending(&net->dev, idx);
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}
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void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
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int idx, bool mask)
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{
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vhost_virtqueue_mask(&net->dev, dev, idx, mask);
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}
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VHostNetState *get_vhost_net(NetClientState *nc)
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{
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VHostNetState *vhost_net = 0;
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if (!nc) {
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return 0;
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}
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switch (nc->info->type) {
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case NET_CLIENT_DRIVER_TAP:
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vhost_net = tap_get_vhost_net(nc);
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break;
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case NET_CLIENT_DRIVER_VHOST_USER:
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vhost_net = vhost_user_get_vhost_net(nc);
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assert(vhost_net);
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break;
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default:
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break;
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}
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return vhost_net;
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}
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int vhost_set_vring_enable(NetClientState *nc, int enable)
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{
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VHostNetState *net = get_vhost_net(nc);
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const VhostOps *vhost_ops = net->dev.vhost_ops;
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nc->vring_enable = enable;
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if (vhost_ops->vhost_set_vring_enable) {
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return vhost_ops->vhost_set_vring_enable(&net->dev, enable);
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}
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return 0;
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}
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#else
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uint64_t vhost_net_get_max_queues(VHostNetState *net)
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{
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return 1;
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}
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struct vhost_net *vhost_net_init(VhostNetOptions *options)
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{
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error_report("vhost-net support is not compiled in");
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return NULL;
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}
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int vhost_net_start(VirtIODevice *dev,
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NetClientState *ncs,
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int total_queues)
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{
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return -ENOSYS;
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}
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void vhost_net_stop(VirtIODevice *dev,
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NetClientState *ncs,
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int total_queues)
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{
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}
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void vhost_net_cleanup(struct vhost_net *net)
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{
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}
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uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
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{
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return features;
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}
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void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
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{
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}
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uint64_t vhost_net_get_acked_features(VHostNetState *net)
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{
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return 0;
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}
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bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
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{
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return false;
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}
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void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
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int idx, bool mask)
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{
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}
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int vhost_net_notify_migration_done(struct vhost_net *net, char* mac_addr)
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{
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return -1;
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}
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VHostNetState *get_vhost_net(NetClientState *nc)
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{
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return 0;
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}
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int vhost_set_vring_enable(NetClientState *nc, int enable)
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{
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return 0;
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}
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#endif
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