virtio-net: batch stats updating
We already have counters for sent/recv packets and sent/recv bytes. Doing a batched update to reduce the number of u64_stats_update_begin/end(). Take care not to bother with stats update when called speculatively. Cc: Willem de Bruijn <willemb@google.com> Signed-off-by: NJason Wang <jasowang@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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