From: Eric Dumazet <edumazet@google.com>
Date: Thu, 22 Feb 2018 19:45:27 -0800
Subject: net_sched: gen_estimator: fix broken estimators based on percpu stats
Patch-mainline: v4.16-rc3
Git-commit: a5f7add332b4ea6d4b9480971b3b0f5e66466ae9
References: bsc#1056787
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.
Fixes: 1c0d32fde5bd ("net_sched: gen_estimator: complete rewrite of rate estimators")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
net/core/gen_estimator.c | 1 +
1 file changed, 1 insertion(+)
--- a/net/core/gen_estimator.c
+++ b/net/core/gen_estimator.c
@@ -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);