netdev - Re: [PATCH v2 bpf-next 0/3] bpf: Program extensions or dynamic re-linking

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Date:   Wed, 22 Jan 2020 23:12:29 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Alexei Starovoitov <ast@...nel.org>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, bpf@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH v2 bpf-next 0/3] bpf: Program extensions or dynamic
 re-linking

On Mon, Jan 20, 2020 at 04:53:45PM -0800, Alexei Starovoitov wrote:
> The last few month BPF community has been discussing an approach to call
> chaining, since exiting bpt_tail_call() mechanism used in production XDP
> programs has plenty of downsides. The outcome of these discussion was a
> conclusion to implement dynamic re-linking of BPF programs. Where rootlet XDP
> program attached to a netdevice can programmatically define a policy of
> execution of other XDP programs. Such rootlet would be compiled as normal XDP
> program and provide a number of placeholder global functions which later can be
> replaced with future XDP programs. BPF trampoline, function by function
> verification were building blocks towards that goal. The patch 1 is a final
> building block. It introduces dynamic program extensions. A number of
> improvements like more flexible function by function verification and better
> libbpf api will be implemented in future patches.
> 
> v1->v2:
> - addressed Andrii's comments
> - rebase

Applied, thanks!