netdev - Re: [PATCH net-next v8 2/3] net sched actions: dump more than TCA_ACT_MAX

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Date:   Thu, 27 Apr 2017 08:30:39 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     davem@...emloft.net, xiyou.wangcong@...il.com,
        eric.dumazet@...il.com, netdev@...r.kernel.org,
        Simon Horman <simon.horman@...ronome.com>,
        Benjamin LaHaise <bcrl@...ck.org>
Subject: Re: [PATCH net-next v8 2/3] net sched actions: dump more than
 TCA_ACT_MAX_PRIO actions per batch

Wed, Apr 26, 2017 at 10:07:08PM CEST, jhs@...atatu.com wrote:
>On 17-04-26 09:56 AM, Jiri Pirko wrote:
>> Wed, Apr 26, 2017 at 03:14:38PM CEST, jhs@...atatu.com wrote:
>> > On 17-04-26 08:08 AM, Jiri Pirko wrote:
>
>[..]
>

[...]

>
>> > Again: You are looking at this from a manageability point of view which
>> > is useful but not the only input into a design. If i can squeeze more
>> > data without killing usability - I am all for it. It just doesnt
>> > compute that it is ok to use a flag per attribute because it looks
>> > beautiful.
>> 
>> Hmm. Now that I'm thinking about it, why don't we have NLA_FLAGS with
>> couple of helpers around it? It will be obvious what the attr is, all
>> kernel code would use the same helpers. Would be nice.
>> 
>
>I think to have flags at that level is useful but it
>is a different hierarchy level. I am not sure the
>"actions dump large messages" is a fit for that level.

Jamal, the idea is to have exactly what you want to have. Only does not
use NLA_U32 attr for that but a special attr NLA_FLAGS which would have
well defined semantics and set of helpers to work with and enforce it.

Then, this could be easily reused in other subsystem that uses netlink