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virtio-net: support queue reset 

virtio-net and vhost-kernel implement queue reset.
Queued packets in the corresponding queue pair are flushed
or purged.

For virtio-net, userspace datapath will be disabled later in
__virtio_queue_reset(). It will set addr of vring to 0 and idx to 0.
Thus, virtio_net_receive() and virtio_net_flush_tx() will not receive
or send packets.

For vhost-net, the datapath will be disabled in vhost_net_virtqueue_reset().

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Signed-off-by: Kangjie Xu <kangjie.xu@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20221017092558.111082-13-xuanzhuo@linux.alibaba.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xuan Zhuo 2022-10-17 17:25:55 +08:00 committed by Michael S. Tsirkin
parent 4fdf69ab69
commit 7dc6be52f4
1 changed files with 18 additions and 0 deletions
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18
hw/net/virtio-net.c
View File

@ -546,6 +546,23 @@ static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc)
return info;
}
static void virtio_net_queue_reset(VirtIODevice *vdev, uint32_t queue_index)
{
VirtIONet *n = VIRTIO_NET(vdev);
NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(queue_index));
if (!nc->peer) {
return;
}
if (get_vhost_net(nc->peer) &&
nc->peer->info->type == NET_CLIENT_DRIVER_TAP) {
vhost_net_virtqueue_reset(vdev, nc, queue_index);
}
flush_or_purge_queued_packets(nc);
}
static void virtio_net_reset(VirtIODevice *vdev)
{
VirtIONet *n = VIRTIO_NET(vdev);
@ -3827,6 +3844,7 @@ static void virtio_net_class_init(ObjectClass *klass, void *data)
vdc->set_features = virtio_net_set_features;
vdc->bad_features = virtio_net_bad_features;
vdc->reset = virtio_net_reset;
vdc->queue_reset = virtio_net_queue_reset;
vdc->set_status = virtio_net_set_status;
vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;