netdev - Re: [oss-drivers] [PATCH bpf-next] tools: bpftool: warn about risky prog array updates

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Message-ID: <CAH3iqT5ixYdaS1HY7=dwS2krdcTofrahMF_vpjeSqsXBmOsqmg@mail.gmail.com>
Date:   Mon, 28 Jan 2019 18:51:10 +0000
From:   Quentin Monnet <quentin.monnet@...ronome.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        OSS-drivers Netronome <oss-drivers@...ronome.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [oss-drivers] [PATCH bpf-next] tools: bpftool: warn about risky
 prog array updates

On Mon, 28 Jan 2019 at 18:29, Jakub Kicinski
<jakub.kicinski@...ronome.com> wrote:
>
> When prog array is updated with bpftool users often refer
> to the map via the ID.  Unfortunately, that's likely
> to lead to confusion because prog arrays get flushed when
> the last user reference is gone.  If there is no other
> reference bpftool will create one, update successfully
> just to close the map again and have it flushed.
>
> Warn about this case in non-JSON mode.
>
> If the problem continues causing confusion we can remove
> the support for referring to a map by ID for prog array
> update completely.  For now it seems like the potential
> inconvenience to users who know what they're doing outweighs
> the benefit.
>
> Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
> Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com>

All good for me!
Quentin