On Tue, 2006-01-08 at 22:34 +1000, Herbert Xu wrote:

What I'd like to know is do we really need to preserve

	tc_verd/tc_index/input_dev

for a packet crossing loopback's xmit function?

My instinctive reaction is to say no. Heres a (slightly complex)
example:

--> eth0(GSO ON) ---> lo --> eth1(GSO off) --> eth3(GSO ON)

When we get to lo in the above graph, input_dev=eth0 and when we leave
that info will be overwritten to be input_dev=lo. 

I just added the GSO markers (incase that info is useful) to show that
we could move in the same topology between GSO and non-GSO devices.

I believe it would be fine for lo not to preserve. Not sure if it is ok
as a general rule though. 

cheers,
jamal