commit 48a8f519e0fe22a5c98523286b2a120841a11dd5
author Patrick McHardy <kaber@trash.net> Fri Oct 31 00:44:18 2008 -0700
committer David S. Miller <davem@davemloft.net> Fri Oct 31 00:44:18 2008 -0700
tree ec70428b026091669bf1e23779f9cfdd1a1ca46f
parent 90d841fd0a5e02affd4e2bbdde4f710c61599281

pkt_sched: Add ->peek() methods for fifo, prio and SFQ qdiscs.

From: Patrick McHardy <kaber@trash.net>

Just as a demonstration how easy adding a peek operation to the
work-conserving qdiscs actually is. It doesn't need to keep or change
any internal state in many cases thanks to the guarantee that the
packet will either be dequeued or, if another packet arrives, the
upper qdisc will immediately ->peek again to reevaluate the state.

(This is only slightly modified Patrick's patch.)

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