2016-02-15 05:32, Lu, Wenzhuo:

From: Ananyev, Konstantin

quoted

From reading X550 spec, I don't really understand what for we need to specify is
it GRE or VXLAN packet, so probably we don't need that flag for now at all?

The reason is we need to set the tunnel type in the Advanced Transmit Data Descriptor.

Why don't we use packet type?

quoted

If we really do, might bw worth to organise it like KT_TX_L4_CKSUM (as enum)
and reserve few values for future expansion (2 or 3 bits?).

Now there're only VxLAN and NVGRE supported. So, only 1 bit is occupied for that. Not sure if more types will be supported in the future. Any suggestions? Thanks.

Yes there can be a lot of tunnel types.
Please check RTE_PTYPE_TUNNEL_*