https://bugs.gentoo.org/560760 From 0cf33fb6b49a19de32859e2cdc6021334f448fb3 Mon Sep 17 00:00:00 2001 From: Jason Wang Date: Fri, 25 Sep 2015 13:21:30 +0800 Subject: [PATCH 3/3] virtio-net: correctly drop truncated packets When packet is truncated during receiving, we drop the packets but neither discard the descriptor nor add and signal used descriptor. This will lead several issues: - sg mappings are leaked - rx will be stalled if a lots of packets were truncated In order to be consistent with vhost, fix by discarding the descriptor in this case. Cc: Michael S. Tsirkin Signed-off-by: Jason Wang Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/net/virtio-net.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index d388c55..a877614 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -1094,13 +1094,7 @@ static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t * must have consumed the complete packet. * Otherwise, drop it. */ if (!n->mergeable_rx_bufs && offset < size) { -#if 0 - error_report("virtio-net truncated non-mergeable packet: " - "i %zd mergeable %d offset %zd, size %zd, " - "guest hdr len %zd, host hdr len %zd", - i, n->mergeable_rx_bufs, - offset, size, n->guest_hdr_len, n->host_hdr_len); -#endif + virtqueue_discard(q->rx_vq, &elem, total); return size; } -- 2.6.0.rc2.230.g3dd15c0