linux-kernel - Re: [PATCH bpf-next v5 0/5] writable contexts for bpf raw tracepoints

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Date:   Fri, 26 Apr 2019 19:15:14 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Matt Mullins <mmullins@...com>
Cc:     Andrew Hall <hall@...com>, Alexei Starovoitov <ast@...nel.org>,
        bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>
Subject: Re: [PATCH bpf-next v5 0/5] writable contexts for bpf raw tracepoints

On Fri, Apr 26, 2019 at 11:50 AM Matt Mullins <mmullins@...com> wrote:
>
> This adds an opt-in interface for tracepoints to expose a writable context to
> BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE programs that are attached, while
> supporting read-only access from existing BPF_PROG_TYPE_RAW_TRACEPOINT
> programs, as well as from non-BPF-based tracepoints.
>
> The initial motivation is to support tracing that can be observed from the
> remote end of an NBD socket, e.g. by adding flags to the struct nbd_request
> header.  Earlier attempts included adding an NBD-specific tracepoint fd, but in
> code review, I was recommended to implement it more generically -- as a result,
> this patchset is far simpler than my initial try.
>
> v4->v5:
>   * rebased onto bpf-next/master and fixed merge conflicts
>   * "tools: sync bpf.h" also syncs comments that have previously changed
>     in bpf-next

Applied. Thanks!