netdev - Re: [PATCH bpf-next 2/3] libbpf: support sleepable progs

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Date:   Fri, 29 May 2020 00:13:59 +0200
From:   KP Singh <kpsingh@...omium.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     davem@...emloft.net, daniel@...earbox.net, netdev@...r.kernel.org,
        bpf@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH bpf-next 2/3] libbpf: support sleepable progs

On 27-May 22:33, Alexei Starovoitov wrote:
> From: Alexei Starovoitov <ast@...nel.org>
> 
> Pass request to load program as sleepable via ".s" suffix in the section name.
> If it happens in the future that all map types and helpers are allowed with
> BPF_F_SLEEPABLE flag "fmod_ret/" and "lsm/" can be aliased to "fmod_ret.s/" and
> "lsm.s/" to make all lsm and fmod_ret programs sleepable by default. The fentry
> and fexit programs would always need to have sleepable vs non-sleepable
> distinction, since not all fentry/fexit progs will be attached to sleepable
> kernel functions.
> 
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>

Acked-by: KP Singh <kpsingh@...gle.com>

> ---
>  tools/lib/bpf/libbpf.c | 25 ++++++++++++++++++++++++-
>  1 file changed, 24 insertions(+), 1 deletion(-)

[...]

> -		prog->prog_flags = attr->prog_flags;
> +		prog->prog_flags |= attr->prog_flags;
>  		if (!first_prog)
>  			first_prog = prog;
>  	}
> -- 
> 2.23.0
>