netdev - Re: [PATCH net-next 0/8] Introduce bpf ID

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Message-ID: <20170531042937.jz4swtnaw33dwvbi@kafai-mba.local>
Date:   Tue, 30 May 2017 21:30:29 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     David Ahern <dsahern@...il.com>
CC:     <netdev@...r.kernel.org>, Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>
Subject: Re: [PATCH net-next 0/8] Introduce bpf ID

On Tue, May 30, 2017 at 06:35:37PM -0600, David Ahern wrote:
> On 5/30/17 6:08 PM, Martin KaFai Lau wrote:
> > This patch series:
> > 1) Introduce ID for both bpf_prog and bpf_map.
> > 2) Add bpf commands to iterate the prog IDs and map
> >    IDs of the system.
> > 3) Add bpf commands to get a prog/map fd from an ID
> > 4) Add bpf command to get prog/map info from a fd.
> >    The prog/map info is a jump start in this patchset
> >    and it is not meant to be a complete list.  They can
> >    be extended in the future patches.
>
> Interesting. This really simplifies the bpf retrieval I have been
> working on:
>     https://github.com/dsahern/linux/commits/bpf/retrieve-bpf-wip
>
> Having the net device, filter, route, socket, cgroup, etc return the ids
> for attached programs solves the problem of getting a reference to all
> of the places BPF programs can be placed.
Right, it is the idea.

I am also baking some follow-up patches for returning xdp-prog's id
through netlink.

>
> This patch set turns an id into a fd, and my patches allow the fd to be
> used to get the bpf code.