Patch "net_sched: gen_estimator: fix broken estimators based on percpu stats" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

net_sched: gen_estimator: fix broken estimators based on percpu stats

to the 4.14-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-gen_estimator-fix-broken-estimators-based-on-percpu-stats.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Eric Dumazet <[email protected]>
Date: Thu, 22 Feb 2018 19:45:27 -0800
Subject: net_sched: gen_estimator: fix broken estimators based on percpu stats

From: Eric Dumazet <[email protected]>

[ Upstream commit a5f7add332b4ea6d4b9480971b3b0f5e66466ae9 ]

pfifo_fast got percpu stats lately, uncovering a bug I introduced last year in linux-4.10.

I missed the fact that we have to clear our temporary storage before calling __gnet_stats_copy_basic() in the case of percpu stats.

Without this fix, rate estimators (tc qd replace dev xxx root est 1sec 4sec pfifo_fast) are utterly broken.

---
 net/core/gen_estimator.c |    1 +
 1 file changed, 1 insertion(+)

@@ -66,6 +66,7 @@ struct net_rate_estimator {
 static void est_fetch_counters(struct net_rate_estimator *e,
 			       struct gnet_stats_basic_packed *b)
 {
+	memset(b, 0, sizeof(*b));
 	if (e->stats_lock)
 		spin_lock(e->stats_lock);
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/doc-change-the-min-default-value-of-tcp_wmem-tcp_rmem.patch queue-4.14/tcp-purge-write-queue-upon-rst.patch queue-4.14/net_sched-gen_estimator-fix-broken-estimators-based-on-percpu-stats.patch queue-4.14/tcp_bbr-better-deal-with-suboptimal-gso.patch