linux-kernel - Re: [PATCH bpf-next v1 5/7] tools: bpftool: support loading map by fd from parent process

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Date:   Wed, 20 Mar 2019 19:05:11 +0000
From:   Quentin Monnet <quentin.monnet@...ronome.com>
To:     Alban Crequy <alban.crequy@...il.com>, ast@...nel.org,
        daniel@...earbox.net
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        alban@...volk.io, iago@...volk.io
Subject: Re: [PATCH bpf-next v1 5/7] tools: bpftool: support loading map by fd
 from parent process

2019-03-20 18:33 UTC+0100 ~ Alban Crequy <alban.crequy@...il.com>
> From: Alban Crequy <alban@...volk.io>
> 
> Using a file descriptor passed by the parent process enables
> applications to fork a bpftool command to inspect a map they know by
> file descriptor even when they don't support bpffs or map ids.
> 
> Documentation and bash completion updated as well.
> 
> Signed-off-by: Alban Crequy <alban@...volk.io>
> ---
>  tools/bpf/bpftool/Documentation/bpftool-map.rst |  8 ++++++++
>  tools/bpf/bpftool/bash-completion/bpftool       | 10 +++++-----
>  tools/bpf/bpftool/map.c                         | 13 +++++++++++++
>  3 files changed, 26 insertions(+), 5 deletions(-)
> 
> diff --git a/tools/bpf/bpftool/Documentation/bpftool-map.rst b/tools/bpf/bpftool/Documentation/bpftool-map.rst
> index dfd8352fa453..658fe2fb8ecf 100644
> --- a/tools/bpf/bpftool/Documentation/bpftool-map.rst
> +++ b/tools/bpf/bpftool/Documentation/bpftool-map.rst
> @@ -265,6 +265,14 @@ would be lost as soon as bpftool exits).
>  
>    anon_inode:bpf-map
>  
> +**# bpftool map exec pinned /sys/fs/bpf/foo fd 99 cmd -- bpftool map show fd 99**
> +
> +::
> +
> +  10: hash  name some_map  flags 0x0
> +	key 4B  value 8B  max_entries 2048  memlock 167936B
> +
> +

Could you please also update the description of the command higher in
that page, and in the interactive help?