netdev - Re: [PATCH iproute2 v3 2/2] tc: pedit: add decrement operation

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Date:   Fri, 25 Jun 2021 22:45:57 -0600
From:   David Ahern <dsahern@...il.com>
To:     Asbjørn Sloth Tønnesen <asbjorn@...jorn.st>,
        netdev@...r.kernel.org
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        Jiri Pirko <jiri@...dia.com>
Subject: Re: [PATCH iproute2 v3 2/2] tc: pedit: add decrement operation

On 6/18/21 10:06 AM, Asbjørn Sloth Tønnesen wrote:
> Implement a decrement operation for ttl and hoplimit.
> 
> Since this is just syntactic sugar, it goes that:
> 
>   tc filter add ... action pedit ex munge ip ttl dec ...
>   tc filter add ... action pedit ex munge ip6 hoplimit dec ...
> 
> is just a more readable version of this:
> 
>   tc filter add ... action pedit ex munge ip ttl add 0xff ...
>   tc filter add ... action pedit ex munge ip6 hoplimit add 0xff ...
> 
> This feature was suggested by some pseudo tc examples in Mellanox's
> documentation[1], but wasn't present in neither their mlnx-iproute2
> nor iproute2.
> 
> Tested with skip_sw on Mellanox ConnectX-6 Dx.
> 
> [1] https://docs.mellanox.com/pages/viewpage.action?pageId=47033989
> 
> v3:
>    - Use dedicated flags argument in parse_cmd() (David Ahern)
>    - Minor rewording of the man page
> 
> v2:
>    - Fix whitespace issue (Stephen Hemminger)
>    - Add to usage info in explain()
> 
> Signed-off-by: Asbjørn Sloth Tønnesen <asbjorn@...jorn.st>
> ---
>  man/man8/tc-pedit.8 |  8 +++++++-
>  tc/m_pedit.c        | 25 +++++++++++++++++++------
>  tc/m_pedit.h        |  4 ++++
>  tc/p_ip.c           |  2 +-
>  tc/p_ip6.c          |  2 +-
>  5 files changed, 32 insertions(+), 9 deletions(-)
> 

applied both to iproute2-next. Thanks,