From: Barret Rhoden <brho@google.com>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: "Matt Bobrowski" <mattbobrowski@google.com>,
"Toke Høiland-Jørgensen" <toke@redhat.com>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Alexei Starovoitov" <ast@kernel.org>,
"Martin KaFai Lau" <kafai@fb.com>,
"Song Liu" <songliubraving@fb.com>, "Yonghong Song" <yhs@fb.com>,
"Marek Majkowski" <marek@cloudflare.com>,
"Lorenz Bauer" <lmb@cloudflare.com>,
"Alan Maguire" <alan.maguire@oracle.com>,
"Jesper Dangaard Brouer" <brouer@redhat.com>,
"David Miller" <davem@davemloft.net>,
"Network Development" <netdev@vger.kernel.org>,
bpf <bpf@vger.kernel.org>
Subject: Re: bpf indirect calls
Date: Mon, 2 Oct 2023 14:50:34 -0400 [thread overview]
Message-ID: <235e7365-2fe3-4bfa-ab11-1dc955d70042@google.com> (raw)
In-Reply-To: <CAADnVQJpCe9e2Qrnsaj4+ab47z00-bEYyHhN_mmpCh4+9i17vQ@mail.gmail.com>
On 9/29/23 17:06, Alexei Starovoitov wrote:
> For certain cases like your example above it's relatively easy to add
> such support, but before we do that please describe the full use case
> that you wanted to implement with indirect calls.
I'll likely want some sort of indirect call for nesting schedulers in
sched_ext / ghost. Specifically, when we're running pick_next_task or
any thread event handler (e.g. wakeup), we're picturing having a
dispatch layer that picks which bpf agent to pass that off to, *and* get
a response from the call. Based on that response, we could possibly
call someone else.
In this scenario, there'd be a 'base layer' BPF prog that handles
pick_next_task from the kernel. That base layer would choose which
subprogram to query for its pick_next_task. Depending on whether or not
that subprogram has a task to run, the base layer may or may not want to
run some other BPF program.
I'm not sure if an indirect call is what I'm looking for here, but it
sounds somewhat related. The difference might be that I'd like to call
a function from a different BPF program, if that's possible.
Thanks,
Barret
next prev parent reply other threads:[~2023-10-02 18:50 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-07 17:20 [PATCH bpf-next v3 0/5] xdp: Support multiple programs on a single interface through chain calls Toke Høiland-Jørgensen
2019-10-07 17:20 ` [PATCH bpf-next v3 1/5] bpf: Support chain calling multiple BPF programs after each other Toke Høiland-Jørgensen
2019-10-07 20:42 ` Alexei Starovoitov
2019-10-08 8:07 ` Toke Høiland-Jørgensen
2019-10-09 1:51 ` Alexei Starovoitov
2019-10-09 8:03 ` Toke Høiland-Jørgensen
2019-10-10 4:41 ` Alexei Starovoitov
2019-10-14 12:35 ` Toke Høiland-Jørgensen
2019-10-14 17:08 ` John Fastabend
2019-10-14 18:48 ` Toke Høiland-Jørgensen
2019-10-15 16:30 ` Edward Cree
2019-10-15 16:42 ` Toke Høiland-Jørgensen
2019-10-15 18:33 ` Edward Cree
2019-10-17 12:11 ` Toke Høiland-Jørgensen
2019-10-22 17:27 ` Edward Cree
2019-10-22 18:07 ` Toke Høiland-Jørgensen
2019-11-12 2:51 ` static and dynamic linking. Was: [PATCH bpf-next v3 1/5] bpf: Support chain calling multiple BPF Alexei Starovoitov
2019-11-12 16:20 ` Toke Høiland-Jørgensen
2019-11-12 19:52 ` Alexei Starovoitov
2019-11-12 21:25 ` Edward Cree
2019-11-12 23:18 ` Alexei Starovoitov
2019-11-13 18:30 ` Edward Cree
2019-11-13 18:51 ` Andrii Nakryiko
2019-11-15 2:13 ` Alexei Starovoitov
2019-11-15 16:56 ` John Fastabend
2019-11-12 23:25 ` John Fastabend
2019-11-13 0:21 ` Alexei Starovoitov
2019-11-13 5:33 ` John Fastabend
2019-11-15 1:50 ` Alexei Starovoitov
2019-11-15 16:39 ` John Fastabend
2019-11-14 15:41 ` Toke Høiland-Jørgensen
2019-11-12 16:32 ` Edward Cree
2019-11-15 11:48 ` Lorenz Bauer
2019-11-15 23:02 ` Alexei Starovoitov
2019-11-18 13:29 ` Lorenz Bauer
2019-10-21 23:51 ` [PATCH bpf-next v3 1/5] bpf: Support chain calling multiple BPF programs after each other Edward Cree
2019-10-16 2:28 ` Alexei Starovoitov
2019-10-16 8:27 ` Jesper Dangaard Brouer
2019-10-16 10:35 ` Daniel Borkmann
2019-10-16 11:16 ` Toke Høiland-Jørgensen
2019-10-16 13:51 ` Toke Høiland-Jørgensen
2019-10-19 20:09 ` bpf indirect calls Alexei Starovoitov
2019-10-20 10:58 ` Toke Høiland-Jørgensen
2019-10-25 16:30 ` Alexei Starovoitov
2019-10-27 12:15 ` Toke Høiland-Jørgensen
2023-09-27 13:27 ` Matt Bobrowski
2023-09-29 21:06 ` Alexei Starovoitov
2023-10-02 18:50 ` Barret Rhoden [this message]
2023-10-06 9:36 ` Matt Bobrowski
2023-10-06 18:49 ` Alexei Starovoitov
2023-10-19 12:28 ` Matt Bobrowski
2019-10-09 10:19 ` [PATCH bpf-next v3 1/5] bpf: Support chain calling multiple BPF programs after each other Jesper Dangaard Brouer
2019-10-09 17:57 ` Alexei Starovoitov
2019-10-07 17:20 ` [PATCH bpf-next v3 2/5] bpf: Add support for setting chain call sequence for programs Toke Høiland-Jørgensen
2019-10-07 20:38 ` Daniel Borkmann
2019-10-08 8:09 ` Toke Høiland-Jørgensen
2019-10-07 17:20 ` [PATCH bpf-next v3 3/5] tools: Update bpf.h header for program chain calls Toke Høiland-Jørgensen
2019-10-07 17:20 ` [PATCH bpf-next v3 4/5] libbpf: Add syscall wrappers for BPF_PROG_CHAIN_* commands Toke Høiland-Jørgensen
2019-10-07 17:20 ` [PATCH bpf-next v3 5/5] selftests: Add tests for XDP chain calls Toke Høiland-Jørgensen
2019-10-07 18:58 ` [PATCH bpf-next v3 0/5] xdp: Support multiple programs on a single interface through " John Fastabend
2019-10-08 8:42 ` Toke Høiland-Jørgensen
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