netdev - Re: [PATCH bpf-next] bpf: clean up eBPF helpers documentation

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Date:   Tue, 29 May 2018 11:27:45 -0700
From:   Song Liu <liu.song.a23@...il.com>
To:     Quentin Monnet <quentin.monnet@...ronome.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Networking <netdev@...r.kernel.org>, oss-drivers@...ronome.com
Subject: Re: [PATCH bpf-next] bpf: clean up eBPF helpers documentation

On Tue, May 29, 2018 at 4:27 AM, Quentin Monnet
<quentin.monnet@...ronome.com> wrote:
> These are minor edits for the eBPF helpers documentation in
> include/uapi/linux/bpf.h.
>
> The main fix consists in removing "BPF_FIB_LOOKUP_", because it ends
> with a non-escaped underscore that gets interpreted by rst2man and
> produces the following message in the resulting manual page:
>
>     DOCUTILS SYSTEM MESSAGES
>            System Message: ERROR/3 (/tmp/bpf-helpers.rst:, line 1514)
>                   Unknown target name: "bpf_fib_lookup".
>
> Other edits consist in:
>
> - Improving formatting for flag values for "bpf_fib_lookup()" helper.
> - Emphasising a parameter name in description of the return value for
>   "bpf_get_stack()" helper.
> - Removing unnecessary blank lines between "Description" and "Return"
>   sections for the few helpers that would use it, for consistency.
>
> Signed-off-by: Quentin Monnet <quentin.monnet@...ronome.com>
> ---
>  include/uapi/linux/bpf.h | 21 ++++++++++-----------
>  1 file changed, 10 insertions(+), 11 deletions(-)
>
> diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> index cc68787f2d97..3f556b35ac8d 100644
> --- a/include/uapi/linux/bpf.h
> +++ b/include/uapi/linux/bpf.h
> @@ -1010,7 +1010,6 @@ union bpf_attr {
>   *             ::
>   *
>   *                     # sysctl kernel.perf_event_max_stack=<new value>
> - *
>   *     Return
>   *             The positive or null stack id on success, or a negative error
>   *             in case of failure.
> @@ -1821,10 +1820,9 @@ union bpf_attr {
>   *             ::
>   *
>   *                     # sysctl kernel.perf_event_max_stack=<new value>
> - *
>   *     Return
> - *             a non-negative value equal to or less than size on success, or
> - *             a negative error in case of failure.
> + *             A non-negative value equal to or less than *size* on success,
> + *             or a negative error in case of failure.
>   *
>   * int skb_load_bytes_relative(const struct sk_buff *skb, u32 offset, void *to, u32 len, u32 start_header)
>   *     Description
> @@ -1845,7 +1843,6 @@ union bpf_attr {
>   *             in socket filters where *skb*\ **->data** does not always point
>   *             to the start of the mac header and where "direct packet access"
>   *             is not available.
> - *
>   *     Return
>   *             0 on success, or a negative error in case of failure.
>   *
> @@ -1861,16 +1858,18 @@ union bpf_attr {
>   *             rt_metric is set to metric from route.
>   *
>   *             *plen* argument is the size of the passed in struct.
> - *             *flags* argument can be one or more BPF_FIB_LOOKUP_ flags:
> + *             *flags* argument can be a combination of one or more of the
> + *             following values:
>   *
> - *             **BPF_FIB_LOOKUP_DIRECT** means do a direct table lookup vs
> - *             full lookup using FIB rules
> - *             **BPF_FIB_LOOKUP_OUTPUT** means do lookup from an egress
> - *             perspective (default is ingress)
> + *             **BPF_FIB_LOOKUP_DIRECT**
> + *                     Do a direct table lookup vs full lookup using FIB
> + *                     rules.
> + *             **BPF_FIB_LOOKUP_OUTPUT**
> + *                     Perform lookup from an egress perspective (default is
> + *                     ingress).
>   *
>   *             *ctx* is either **struct xdp_md** for XDP programs or
>   *             **struct sk_buff** tc cls_act programs.
> - *
>   *     Return
>   *             Egress device index on success, 0 if packet needs to continue
>   *             up the stack for further processing or a negative error in case
> --
> 2.14.1
>

Please also apply the same changes to tools/include/uapi/linux/bpf.h.

Other than this, it looks to me.

Acked-by: Song Liu <songliubraving@...com>

Thanks,
Song