netdev - Re: [PATCH net-next 1/1] net sched actions: dump more than TCA_ACT_MAX

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Message-ID: <1492434659.10587.90.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Mon, 17 Apr 2017 06:10:59 -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: [PATCH net-next 1/1] net sched actions: dump more than
 TCA_ACT_MAX_PRIO actions per batch

On Mon, 2017-04-17 at 07:01 -0400, Jamal Hadi Salim wrote:

> The name "pad" is ugly - but _we need to put these reserved spaces
> to good use_. We cant keep declaring pads and say they should never
> be used in the future.
> We dont need more than 2-3 bits for the flags for example and i dont
> see anyone dumping 64K actions in one message.
> An attribute is a big waste of space. I cant change the name pad - 
> perhaps a union with a new name? We had a similar discussion a while 
> back on some netlink header, i just dont remember the details.
> Suggestions?

We can not assume user programs properly cleared the paddings anyway.

Using them for 'new features' is risky, since it might break programs.

So the safe way is using new attributes really.