netdev - Re: [PATCH net-next V2 0/3] net/sched: act_pedit: Use offset relative to conventional network headers

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Date:   Thu, 5 Jan 2017 12:54:14 +0100
From:   Jiri Benc <jbenc@...hat.com>
To:     Amir Vadai <amir@...ai.me>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Jiri Pirko <jiri@...lanox.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Hadar Har-Zion <hadarh@...lanox.com>
Subject: Re: [PATCH net-next V2 0/3] net/sched: act_pedit: Use offset
 relative to conventional network headers

On Thu,  5 Jan 2017 11:54:51 +0200, Amir Vadai wrote:
> You asked me [1] why did I use specific header names instead of layers (L2, L3...),
> and I explained that it is on purpose, this extra information is planned to be used
> by hardware drivers to offload the action.
> 
> Some FW/HW parser APIs are such that they need to get the specific header type (e.g
> IPV4 or IPV6, TCP or UDP) and not only the networking level (e.g network or transport).

Don't we need better API specification (and enforcement) then, though?
See below.

> Usage example:
> $ tc filter add dev enp0s9 protocol ip parent ffff: \
>    flower \
>      ip_proto tcp \
>     dst_port 80 \
>    action \
>        pedit munge ip ttl add 0xff \
>        pedit munge tcp dport set 8080 \
>      pipe action mirred egress redirect dev veth0

What happens when one does:

tc filter add ... flower ip_proto udp action pedit munge tcp ...

?

 Jiri