netdev - Re: [PATCH bpf-next 08/29] bpf: Keep active attached trampoline in bpf

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Date:   Wed, 24 Nov 2021 13:48:09 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>
Subject: Re: [PATCH bpf-next 08/29] bpf: Keep active attached trampoline in bpf_prog

On Thu, Nov 18, 2021 at 3:25 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> Keeping active attached trampoline in bpf_prog so it can be used
> in following changes to account for multiple functions attachments
> in program.
>
> As EXT programs are not going to be supported in multiple functions
> attachment for now, I'm keeping them stored in link.

can the same EXT program be attached twice? If not, why can't you just
use the same prog->aux->trampoline instead of the if/else everywhere?

>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  include/linux/bpf.h  |  1 +
>  kernel/bpf/syscall.c | 34 +++++++++++++++++++++++++++++-----
>  2 files changed, 30 insertions(+), 5 deletions(-)
>