netdev - Re: [PATCH v4] samples/bpf: Add xdp

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Message-ID: <CAEf4BzY_s_2YHgrbNzVPTC6qtVXmz9LvVPtZcw1AWSffi8aYtQ@mail.gmail.com>
Date:   Sun, 29 Mar 2020 16:52:59 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Eric Sage <eric@...e.org>
Cc:     bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin Lau <kafai@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        john fastabend <john.fastabend@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH v4] samples/bpf: Add xdp_stat sample program

On Sun, Mar 29, 2020 at 4:35 PM Eric Sage <eric@...e.org> wrote:
>
> At Facebook we use tail calls to jump between our firewall filters and
> our L4LB. This is a program I wrote to estimate per program performance
> by swapping out the entries in the program array with interceptors that
> take measurements and then jump to the original entries.
>
> I found the sample programs to be invaluable in understanding how to use
> the libbpf API (as well as the test env from the xdp-tutorial repo for
> testing), and want to return the favor. I am currently working on
> my next iteration that uses fentry/fexit to be less invasive,
> but I thought it was an interesting PoC of what you can do with program
> arrays.
>
> v4:
> - rebase
> v3:
> - Fixed typos in xdp_stat_kern.c
> - Switch to using key_size, value_size for prog arrays
>
> Signed-off-by: Eric Sage <eric@...e.org>
> Acked-by: Andrii Nakryiko <andriin@...com>
> ---
>  samples/bpf/Makefile          |   3 +
>  samples/bpf/xdp_stat          | Bin 0 -> 200488 bytes

Add xdp_stat to .gitignore?

>  samples/bpf/xdp_stat_common.h |  28 ++
>  samples/bpf/xdp_stat_kern.c   | 192 +++++++++
>  samples/bpf/xdp_stat_user.c   | 748 ++++++++++++++++++++++++++++++++++
>  5 files changed, 971 insertions(+)
>  create mode 100755 samples/bpf/xdp_stat
>  create mode 100644 samples/bpf/xdp_stat_common.h
>  create mode 100644 samples/bpf/xdp_stat_kern.c
>  create mode 100644 samples/bpf/xdp_stat_user.c
>