netdev - Re: [PATCH v2 bpf-next 1/2] bpf: replace prog_raw_tp+btf_id with prog

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Message-ID: <20191031001848.nbozv5k4qfc572ii@kafai-mbp>
Date:   Thu, 31 Oct 2019 00:18:57 +0000
From:   Martin Lau <kafai@...com>
To:     Alexei Starovoitov <ast@...nel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH v2 bpf-next 1/2] bpf: replace prog_raw_tp+btf_id with
 prog_tracing

On Wed, Oct 30, 2019 at 03:32:11PM -0700, Alexei Starovoitov wrote:
> The bpf program type raw_tp together with 'expected_attach_type'
> was the most appropriate api to indicate BTF-enabled raw_tp programs.
> But during development it became apparent that 'expected_attach_type'
> cannot be used and new 'attach_btf_id' field had to be introduced.
> Which means that the information is duplicated in two fields where
> one of them is ignored.
> Clean it up by introducing new program type where both
> 'expected_attach_type' and 'attach_btf_id' fields have
> specific meaning.
> In the future 'expected_attach_type' will be extended
> with other attach points that have similar semantics to raw_tp.
> This patch is replacing BTF-enabled BPF_PROG_TYPE_RAW_TRACEPOINT with
> prog_type = BPF_RPOG_TYPE_TRACING
> expected_attach_type = BPF_TRACE_RAW_TP
> attach_btf_id = btf_id of raw tracepoint inside the kernel
> Future patches will add
> expected_attach_type = BPF_TRACE_FENTRY or BPF_TRACE_FEXIT
> where programs have the same input context and the same helpers,
> but different attach points.
Acked-by: Martin KaFai Lau <kafai@...com>