netdev - Re: [PATCH RFC 1/3] xdp: Infrastructure to generalize XDP

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Date:   Fri, 23 Sep 2016 07:26:41 -0700
From:   Alexei Starovoitov <ast@...com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Jamal Hadi Salim <jhs@...atatu.com>
CC:     Tom Herbert <tom@...bertland.com>, <davem@...emloft.net>,
        <netdev@...r.kernel.org>, <kernel-team@...com>,
        <tariqt@...lanox.com>, <bblanco@...mgrid.com>,
        <alexei.starovoitov@...il.com>, <eric.dumazet@...il.com>,
        Thomas Graf <tgraf@...g.ch>
Subject: Re: [PATCH RFC 1/3] xdp: Infrastructure to generalize XDP

On 9/23/16 6:00 AM, Jesper Dangaard Brouer wrote:
> To support Tom's case, with eBPF, I think we would have to implement
> specific eBPF helper functions that can do the ILA table lookups.  And
> then need a userspace component to load the eBPF program.  Why add all
> this, when we could contain all this in the kernel, and simply call
> this as native C-code via the XDP hook?

well, ILA router was written in BPF already :) Once for tc+clsact
and once for XDP. In both cases no extra bpf helpers were needed.
Due to this use case we added an optimization to be able to do
a map lookup with packet data directly (instead of copying packet
bytes to stack and pointing map_lookup helper to stack).
Looks like those ila router patches never made it to the list.
I'll dig them out and forward.