netdev - Re: [PATCH net-next v5 1/2] net sched actions: dump more than TCA_ACT_MAX

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Date:   Mon, 24 Apr 2017 16:30:33 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     jhs@...atatu.com
Cc:     simon.horman@...ronome.com, jiri@...nulli.us,
        xiyou.wangcong@...il.com, eric.dumazet@...il.com,
        netdev@...r.kernel.org, tom@...bertland.com, pablo@...filter.org
Subject: Re: [PATCH net-next v5 1/2] net sched actions: dump more than
 TCA_ACT_MAX_PRIO actions per batch

From: Jamal Hadi Salim <jhs@...atatu.com>
Date: Mon, 24 Apr 2017 08:49:00 -0400

> Yes, space is important and if i can express upto 32 flags
> with one TLV rather than 32 TLVs i choose one TLV.

Which is fine.  But two things:

1) Again, bits you aren't using now, make sure userspace doesn't
   set them.  And if it does, reject.

2) If you are worried about performance, we're talking about a TLV in
   the request here not the dump response itself so performance isn't
   a real issue as Pablo mentioned.