From: Jarek Poplawski <jarkao2@gmail.com>
Date: Fri, 31 Oct 2008 07:47:01 +0000 (-0700)
Subject: pkt_sched: Add peek emulation for non-work-conserving qdiscs.
X-Git-Tag: v2.6.29-rc1~581^2~923
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=77be155cba4e163e8bba9fd27222a8b6189ec4f7;p=pandora-kernel.git

pkt_sched: Add peek emulation for non-work-conserving qdiscs.

This patch adds qdisc_peek_dequeued() wrapper to emulate peek method
with qdisc->dequeue() and storing "peeked" skb in qdisc->gso_skb until
dequeuing. This is mainly for compatibility reasons not to break some
strange configs because peeking is expected for non-work-conserving
parent qdiscs to query work-conserving child qdiscs.

This implementation requires using qdisc_dequeue_peeked() wrapper
instead of directly calling qdisc->dequeue() for all qdiscs ever
querried with qdisc->ops->peek() or qdisc_peek_dequeued().

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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