From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Alexei Starovoitov <ast@kernel.org>, davem@davemloft.net
Cc: daniel@iogearbox.net, netdev@vger.kernel.org,
bpf@vger.kernel.org, kernel-team@fb.com
Subject: Re: [PATCH v2 bpf-next 0/3] bpf: Program extensions or dynamic re-linking
Date: Tue, 21 Jan 2020 16:37:31 +0100 [thread overview]
Message-ID: <87k15kbz2c.fsf@toke.dk> (raw)
In-Reply-To: <20200121005348.2769920-1-ast@kernel.org>
Alexei Starovoitov <ast@kernel.org> writes:
> 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.
This is great, thank you! I'll go play around with it; couldn't spot
anything obvious from eye-balling the code, except that yeah, it does
need a more flexible libbpf api :)
One thing that's not obvious to me: How can userspace tell which
programs replace which functions after they are loaded? Is this put into
prog_tags in struct bpf_prog_info, or?
For the series:
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
-Toke
next prev parent reply other threads:[~2020-01-21 15:37 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-21 0:53 [PATCH v2 bpf-next 0/3] bpf: Program extensions or dynamic re-linking Alexei Starovoitov
2020-01-21 0:53 ` [PATCH v2 bpf-next 1/3] bpf: Introduce dynamic program extensions Alexei Starovoitov
2020-01-21 7:36 ` John Fastabend
2020-01-21 16:00 ` Alexei Starovoitov
2020-01-21 18:15 ` John Fastabend
2020-01-21 19:08 ` Alexei Starovoitov
2020-01-21 19:54 ` John Fastabend
2020-01-21 21:13 ` Yonghong Song
2020-01-21 0:53 ` [PATCH v2 bpf-next 2/3] libbpf: Add support for " Alexei Starovoitov
2020-01-21 18:38 ` John Fastabend
2020-01-21 0:53 ` [PATCH v2 bpf-next 3/3] selftests/bpf: Add tests " Alexei Starovoitov
2020-01-21 18:41 ` John Fastabend
2020-01-21 15:37 ` Toke Høiland-Jørgensen [this message]
2020-01-21 17:00 ` [PATCH v2 bpf-next 0/3] bpf: Program extensions or dynamic re-linking Alexei Starovoitov
2020-01-22 10:45 ` Toke Høiland-Jørgensen
2020-01-21 18:21 ` Andrii Nakryiko
2020-01-22 22:12 ` Daniel Borkmann
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