sch_sfq: avoid giving spurious NET_XMIT_CN signals

While chasing a possible net_sched bug, I found that IP fragments have
litle chance to pass a congestioned SFQ qdisc :

- Say SFQ qdisc is full because one flow is non responsive.
- ip_fragment() wants to send two fragments belonging to an idle flow.
- sfq_enqueue() queues first packet, but see queue limit reached :
- sfq_enqueue() drops one packet from 'big consumer', and returns
NET_XMIT_CN.
- ip_fragment() cancel remaining fragments.

This patch restores fairness, making sure we return NET_XMIT_CN only if
we dropped a packet from the same flow.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Patrick McHardy <kaber@trash.net>
CC: Jarek Poplawski <jarkao2@gmail.com>
CC: Jamal Hadi Salim <hadi@cyberus.ca>
CC: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 2 deletions

diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
index 7ef87f9eb675..b1d00f8e09f8 100644
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -361,7 +361,7 @@ sfq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 {
         struct sfq_sched_data *q = qdisc_priv(sch);
         unsigned int hash;
-        sfq_index x;
+        sfq_index x, qlen;
         struct sfq_slot *slot;
         int uninitialized_var(ret);
 
@@ -405,8 +405,12 @@ sfq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
         if (++sch->q.qlen <= q->limit)
                 return NET_XMIT_SUCCESS;
 
+        qlen = slot->qlen;
         sfq_drop(sch);
-        return NET_XMIT_CN;
+        /* Return Congestion Notification only if we dropped a packet
+         * from this flow.
+         */
+        return (qlen != slot->qlen) ? NET_XMIT_CN : NET_XMIT_SUCCESS;
 }
 
 static struct sk_buff *