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

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Message-ID: <19cd3d0a-12eb-b8ca-a054-62d86ba2a509@gmail.com>
Date:   Tue, 30 May 2017 18:35:37 -0600
From:   David Ahern <dsahern@...il.com>
To:     Martin KaFai Lau <kafai@...com>, netdev@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>, kernel-team@...com
Subject: Re: [PATCH net-next 0/8] Introduce bpf ID

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.

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