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authorHagen Paul Pfeifer <hagen@jauu.net>2010-01-24 12:30:59 +0000
committerDavid S. Miller <davem@davemloft.net>2010-01-28 21:27:00 -0800
commit57dbb2d83d100ea601c54fe129bfde0678db5dee (patch)
tree40305bcd986692f512b1b5e848c0b0f612968c6a /include/net/pkt_sched.h
parentd74340d31bf1dbeb00acadddd8697666528a7846 (diff)
sched: add head drop fifo queue
This adds an additional queuing strategy, called pfifo_head_drop, to remove the oldest skb in the case of an overflow within the queue - the head element - instead of the last skb (tail). To remove the oldest skb in congested situations is useful for sensor network environments where newer packets reflect the superior information. Reviewed-by: Florian Westphal <fw@strlen.de> Acked-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Hagen Paul Pfeifer <hagen@jauu.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/pkt_sched.h')
-rw-r--r--include/net/pkt_sched.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h
index 2d567265363..b6cdc33b39c 100644
--- a/include/net/pkt_sched.h
+++ b/include/net/pkt_sched.h
@@ -71,6 +71,7 @@ extern void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
extern struct Qdisc_ops pfifo_qdisc_ops;
extern struct Qdisc_ops bfifo_qdisc_ops;
+extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
extern int fifo_set_limit(struct Qdisc *q, unsigned int limit);
extern struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,