netdev - Re: [PATCH bpf-next v2 0/7] Add support for XDP

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Date:   Mon, 17 Dec 2018 18:36:00 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Björn Töpel <bjorn.topel@...el.com>
Cc:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Björn Töpel 
        <bjorn.topel@...il.com>, magnus.karlsson@...el.com,
        magnus.karlsson@...il.com, ast@...nel.org, daniel@...earbox.net,
        netdev@...r.kernel.org, u9012063@...il.com, qi.z.zhang@...el.com,
        andrew@...n.ch
Subject: Re: [PATCH bpf-next v2 0/7] Add support for XDP_ATTACH

On Mon, 17 Dec 2018 14:39:57 +0100, Björn Töpel wrote:
> OTOH the implementation would probably look different if there was a
> per-q program, because this would open up for more optimizations. One
> could even imagine that the socket fd was part of the program (part of
> relocation process) when loading the program. That could get rid of yet
> another if-statement that check for socket existence. :-)

Interesting thought, then we would have to teach the BPF subsystem to
express program dependencies (this program can only be used on queue
where given XSK is attached), and have the networking subsystem
(drivers?) check those constraints when attaching. Did I get this right?