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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2011-07-29 19:22:42 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-08-01 02:27:21 -0700 |
| commit | e1738bd9cecc5c867b0e2996470c1ff20f66ba79 (patch) | |
| tree | c69e0943a29ceb588c8ef8af19130436373d4f1e /net/sched | |
| parent | 956837f7c954443f426a82ba6f17b33488cf9a0c (diff) | |
| download | linux-e1738bd9cecc5c867b0e2996470c1ff20f66ba79.tar.bz2 | |
sch_sfq: fix sfq_enqueue()
commit 8efa88540635 (sch_sfq: avoid giving spurious NET_XMIT_CN signals)
forgot to call qdisc_tree_decrease_qlen() to signal upper levels that a
packet (from another flow) was dropped, leading to various problems.
With help from Michal Soltys and Michal Pokrywka, who did a bisection.
Bugzilla ref: https://bugzilla.kernel.org/show_bug.cgi?id=39372
Debian ref: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=631945
Reported-by: Lucas Bocchi <lucas.bocchi@gmail.com>
Reported-and-bisected-by: Michal Pokrywka <wolfmoon@o2.pl>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Michal Soltys <soltys@ziu.info>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/sch_sfq.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c index 4536ee64383e..4f5510e2bd6f 100644 --- a/net/sched/sch_sfq.c +++ b/net/sched/sch_sfq.c @@ -410,7 +410,12 @@ sfq_enqueue(struct sk_buff *skb, struct Qdisc *sch) /* Return Congestion Notification only if we dropped a packet * from this flow. */ - return (qlen != slot->qlen) ? NET_XMIT_CN : NET_XMIT_SUCCESS; + if (qlen != slot->qlen) + return NET_XMIT_CN; + + /* As we dropped a packet, better let upper stack know this */ + qdisc_tree_decrease_qlen(sch, 1); + return NET_XMIT_SUCCESS; } static struct sk_buff * |