netdev-linux: Read packet auxdata to obtain vlan_tid

If VLAN acceleration is used when the kernel receives a packet
then the outer-most VLAN tag will not be present in the packet
when it is received by netdev-linux. Rather, it will be present
in auxdata.

This patch uses recvmsg() instead of recv() to read auxdata for
each packet and if the vlan_tid is set then it is added to the packet.

Adding the vlan_tid makes use of headroom available
in the buffer parameter of rx_recv.

Signed-off-by: Simon Horman <horms@verge.net.au>
Co-authored-by: Ben Pfaff <blp@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/sparse/sys/socket.h b/include/sparse/sys/socket.h
index 75ee43c6c..3212bf4b7 100644
--- a/include/sparse/sys/socket.h
+++ b/include/sparse/sys/socket.h
@@ -87,6 +87,7 @@ enum {
 };
 
 enum {
+    SOL_PACKET,
     SOL_SOCKET
 };