netdev - Re: [PATCH v4 bpf-next 15/20] bpf: Annotate context types

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Message-ID: <8D70C347-697F-42BD-9FE4-97944884C20B@fb.com>
Date:   Thu, 14 Nov 2019 23:23:51 +0000
From:   Song Liu <songliubraving@...com>
To:     Alexei Starovoitov <ast@...nel.org>
CC:     David Miller <davem@...emloft.net>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "x86@...nel.org" <x86@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH v4 bpf-next 15/20] bpf: Annotate context types



> On Nov 14, 2019, at 10:57 AM, Alexei Starovoitov <ast@...nel.org> wrote:
> 
> Annotate BPF program context types with program-side type and kernel-side type.
> This type information is used by the verifier. btf_get_prog_ctx_type() is
> used in the later patches to verify that BTF type of ctx in BPF program matches to
> kernel expected ctx type. For example, the XDP program type is:
> BPF_PROG_TYPE(BPF_PROG_TYPE_XDP, xdp, struct xdp_md, struct xdp_buff)
> That means that XDP program should be written as:
> int xdp_prog(struct xdp_md *ctx) { ... }
> 
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>

Acked-by: Song Liu <songliubraving@...com>