netdev - Re: Case for reusing netlink PADs WAS(Re: [PATCH net-next 1/1] net sched actions: dump more than TCA_ACT_MAX

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Message-ID: <1492525186.10587.119.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Tue, 18 Apr 2017 07:19:46 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     Jiri Pirko <jiri@...nulli.us>, davem@...emloft.net,
        netdev@...r.kernel.org, xiyou.wangcong@...il.com
Subject: Re: Case for reusing netlink PADs WAS(Re: [PATCH net-next 1/1] net
 sched actions: dump more than TCA_ACT_MAX_PRIO actions per batch

On Tue, 2017-04-18 at 08:48 -0400, Jamal Hadi Salim wrote:

> For our case it is _very sad_ that someone actually explicitly defined
> pads - in my opinion for no other purpose other than reuse and then
> we say we cant use them after.


Again, there is nothing you can do to avoid some pads _once_ they are
there.

Even if you leave the pad here, the 'wire protocol' will add padding
anyway ( NLMSG_ALIGN() and friends)