This is a note to let you know that I've just added the patch titled
net_sched/sfq: update hierarchical backlog when drop packet
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net_sched-sfq-update-hierarchical-backlog-when-drop-packet.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Aug 24 17:48:38 PDT 2017
From: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Date: Tue, 15 Aug 2017 16:37:04 +0300
Subject: net_sched/sfq: update hierarchical backlog when drop packet
From: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
[ Upstream commit 325d5dc3f7e7c2840b65e4a2988c082c2c0025c5 ]
When sfq_enqueue() drops head packet or packet from another queue it
have to update backlog at upper qdiscs too.
Fixes: 2ccccf5fb43f ("net_sched: update hierarchical backlog too")
Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Acked-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/sched/sch_sfq.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -434,6 +434,7 @@ congestion_drop:
qdisc_drop(head, sch);
slot_queue_add(slot, skb);
+ qdisc_tree_reduce_backlog(sch, 0, delta);
return NET_XMIT_CN;
}
@@ -465,8 +466,10 @@ enqueue:
/* Return Congestion Notification only if we dropped a packet
* from this flow.
*/
- if (qlen != slot->qlen)
+ if (qlen != slot->qlen) {
+ qdisc_tree_reduce_backlog(sch, 0, dropped - qdisc_pkt_len(skb));
return NET_XMIT_CN;
+ }
/* As we dropped a packet, better let upper stack know this */
qdisc_tree_reduce_backlog(sch, 1, dropped);
Patches currently in stable-queue which might be from khlebnikov@xxxxxxxxxxxxxx are
queue-4.4/net_sched-remove-warning-from-qdisc_hash_add.patch
queue-4.4/net_sched-fix-order-of-queue-length-updates-in-qdisc_replace.patch
queue-4.4/net_sched-sfq-update-hierarchical-backlog-when-drop-packet.patch