Hi Paul,

On Sun, Feb 20, 2022 at 11:32:26AM +0200, Paul Blakey wrote:
> After cited commit optimizted hw insertion, flow table entries are
> populated with ifindex information which was intended to only be used
> for HW offload. This tuple ifindex is hashed in the flow table key, so
> it must be filled for lookup to be successful. But tuple ifindex is only
> relevant for the netfilter flowtables (nft), so it's not filled in
> act_ct flow table lookup, resulting in lookup failure, and no SW
> offload and no offload teardown for TCP connection FIN/RST packets.
> 
> To fix this, remove ifindex from hash, and allow lookup without
> the ifindex. Act ct will lookup without the ifindex filled.

I think it is good to add FLOW_OFFLOAD_XMIT_TC (instead of relying on
FLOW_OFFLOAD_XMIT_UNSPEC), this allows for more tc specific fields in
the future.

See attached patch.

Thanks.
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