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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 <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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