netdev - Re: [PATCH v2 net-next 2/2] tc: make ingress and egress qdiscs consistent

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Message-Id: <20150408.123208.890310178000649038.davem@davemloft.net>
Date:	Wed, 08 Apr 2015 12:32:08 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ast@...mgrid.com
Cc:	jhs@...atatu.com, daniel@...earbox.net, jiri@...nulli.us,
	tgraf@...g.ch, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next 2/2] tc: make ingress and egress qdiscs
 consistent

From: Alexei Starovoitov <ast@...mgrid.com>
Date: Wed, 08 Apr 2015 09:26:36 -0700

> My preference is to add 'needs_l2' flag to ingress qdisc.

The problem is that needs_l2 is not property of individual qdisc,
but conditionally 1 or more things sitting behind it.

You can mix u32 and bpf classifiers.  One wants need_L2 another
does not, and you therefore cannot handle this problem in this
manner.

Face it, we're stuck with what we have.  And I think you will
have to adjust generated bpf program based upon whether it is
being attacked to ingress or egress qdisc.
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