2012-01-04 01:08:15 +02:00
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From: Eric Dumazet <eric.dumazet@gmail.com>
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Date: Fri, 29 Jul 2011 19:22:42 +0000 (+0000)
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Subject: sch_sfq: fix sfq_enqueue()
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X-Git-Tag: v3.1-rc1~24^2~29
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X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=e1738bd9cecc5c867b0e2996470c1ff20f66ba79
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sch_sfq: fix sfq_enqueue()
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commit 8efa88540635 (sch_sfq: avoid giving spurious NET_XMIT_CN signals)
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forgot to call qdisc_tree_decrease_qlen() to signal upper levels that a
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packet (from another flow) was dropped, leading to various problems.
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With help from Michal Soltys and Michal Pokrywka, who did a bisection.
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Bugzilla ref: https://bugzilla.kernel.org/show_bug.cgi?id=39372
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Debian ref: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=631945
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Reported-by: Lucas Bocchi <lucas.bocchi@gmail.com>
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Reported-and-bisected-by: Michal Pokrywka <wolfmoon@o2.pl>
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Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
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CC: Michal Soltys <soltys@ziu.info>
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Acked-by: Patrick McHardy <kaber@trash.net>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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--- a/net/sched/sch_sfq.c
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+++ b/net/sched/sch_sfq.c
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2012-04-04 18:53:01 +03:00
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@@ -410,7 +410,12 @@ sfq_enqueue(struct sk_buff *skb, struct
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2012-01-04 01:08:15 +02:00
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/* Return Congestion Notification only if we dropped a packet
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* from this flow.
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*/
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- return (qlen != slot->qlen) ? NET_XMIT_CN : NET_XMIT_SUCCESS;
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+ if (qlen != slot->qlen)
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+ return NET_XMIT_CN;
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+
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+ /* As we dropped a packet, better let upper stack know this */
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+ qdisc_tree_decrease_qlen(sch, 1);
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+ return NET_XMIT_SUCCESS;
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}
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static struct sk_buff *
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