netdev - Re: [PATCH RFC net-next 1/4] ipv4: fib_rules: support match on sport, dport and ip proto

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Date:   Mon, 12 Feb 2018 13:54:59 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     roopa@...ulusnetworks.com, netdev@...r.kernel.org,
        dsa@...ulusnetworks.com, nikolay@...ulusnetworks.com
Subject: Re: [PATCH RFC net-next 1/4] ipv4: fib_rules: support match on
 sport, dport and ip proto

On Mon, 2018-02-12 at 16:05 -0500, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Mon, 12 Feb 2018 12:49:33 -0800
> 
> > Any setup with about 20 rules to be evaluated (per packet cost) will
> > feel the pain...
> > 
> > I wonder if we could JIT/eBPF this thing.
> 
> That's true for the software implementation angle.
> 
> But I bet anyone actually using this thing will get it hardware
> offloaded.

I wish :)

We had project/teams using different routing tables for each vlan they
setup :/

Setups with tunnels are doubly impacted, it is really easy to reach 20
evaluated rules per incoming and outgoing packet.