From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Ahern <dsahern@gmail.com>
Subject: Re: Kernel 4.19 network performance - forwarding/routing normal users
 traffic
Date: Thu, 8 Nov 2018 11:05:21 -0700
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Cc: netdev <netdev@vger.kernel.org>, Yoel Caspersen <yoel@kviknet.dk>
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On 11/8/18 10:30 AM, Paweł Staszewski wrote:
> Wondering about this:
> swapper     0 [045] 68494.770287: fib:fib_table_lookup: table 254 oif 0
> iif 6 proto 1 192.168.22.237/0 -> 172.16.0.2/0 tos 0 scope 0 flags 0 ==>
> dev vlan1740 gw 0.0.0.0 src 172.16.0.1 err 0
>             7fff818c13b5 fib_table_lookup ([kernel.kallsyms])
> 
> oif 0 ?
> 
> Is that correct here ?

ingress path so iif is set to the vlan device and oif is 0.

egress lookups (e.g., locally generated traffic) have oif non-0.