netdev - Re: [PATCH bpf v2 4/6] tools: bpf: sync bpf uapi header

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Message-ID: <CAADnVQKzBdSLNXEmd47xTv15caXWp6JTCAnHD3n7Trbr9BZq4A@mail.gmail.com>
Date:   Fri, 18 May 2018 09:08:42 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Sandipan Das <sandipan@...ux.vnet.ibm.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Network Development <netdev@...r.kernel.org>,
        linuxppc-dev@...ts.ozlabs.org,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: Re: [PATCH bpf v2 4/6] tools: bpf: sync bpf uapi header

On Fri, May 18, 2018 at 5:50 AM, Sandipan Das
<sandipan@...ux.vnet.ibm.com> wrote:
> Syncing the bpf.h uapi header with tools so that struct
> bpf_prog_info has the two new fields for passing on the
> addresses of the kernel symbols corresponding to each
> function in a JITed program.
>
> Signed-off-by: Sandipan Das <sandipan@...ux.vnet.ibm.com>
> ---
>  tools/include/uapi/linux/bpf.h | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
> index d94d333a8225..040c9cac7303 100644
> --- a/tools/include/uapi/linux/bpf.h
> +++ b/tools/include/uapi/linux/bpf.h
> @@ -2188,6 +2188,8 @@ struct bpf_prog_info {
>         __u32 xlated_prog_len;
>         __aligned_u64 jited_prog_insns;
>         __aligned_u64 xlated_prog_insns;
> +       __aligned_u64 jited_ksyms;
> +       __u32 nr_jited_ksyms;
>         __u64 load_time;        /* ns since boottime */
>         __u32 created_by_uid;
>         __u32 nr_map_ids;

this breaks uapi.
New fields can only be added to the end.