netdev - Re: [PATCH bpf-next 2/3] bpf: generate directly-usable raw_tp

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Message-ID: <41a654b1-db73-1c18-221c-e055e2d3ff37@fb.com>
Date:   Mon, 2 Mar 2020 08:36:05 -0800
From:   Yonghong Song <yhs@...com>
To:     Andrii Nakryiko <andriin@...com>, <bpf@...r.kernel.org>,
        <netdev@...r.kernel.org>, <ast@...com>, <daniel@...earbox.net>,
        <ethercflow@...il.com>
CC:     <andrii.nakryiko@...il.com>, <kernel-team@...com>
Subject: Re: [PATCH bpf-next 2/3] bpf: generate directly-usable raw_tp_##call
 structs for raw tracepoints



On 3/1/20 12:10 AM, Andrii Nakryiko wrote:
> In addition to btf_trace_##call typedefs to func protos, generate a struct
> raw_tp_##call with memory layout directly usable from BPF programs to access
> raw tracepoint arguments. This allows for user BPF programs to directly use
> such structs for their raw tracepoint BPF programs when using vmlinux.h,
> without having to manually copy/paste and maintain raw tracepoint argument
> declarations. Additionally, due to CO-RE and preserve_access_index attribute,
> such structs are relocatable, all the CO-RE relocations and field existence
> checks are available automatically to such BPF programs.
> 
> runqslower example in next patch will demonstrate this usage.
> 
> Signed-off-by: Andrii Nakryiko <andriin@...com>

Acked-by: Yonghong Song <yhs@...com>