K 10
svn:author
V 6
mlaier
K 8
svn:date
V 27
2010-02-13T16:04:58.051289Z
K 7
svn:log
V 574
Fix drbr and altq interaction:
 - introduce drbr_needs_enqueue that returns whether the interface/br needs
   an enqueue operation: returns true if altq is enabled or there are
   already packets in the ring (as we need to maintain packet order)
 - update all drbr consumers
 - fix drbr_flush
 - avoid using the driver queue (IFQ_DRV_*) in the altq case as the
   multiqueue consumer does not provide enough protection, serialize altq
   interaction with the main queue lock
 - make drbr_dequeue_cond work with altq

Discussed with:		kmacy, yongari, jfv
MFC after:		4 weeks

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