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net_sched: gen_estimator: fix broken estimators based on percpu stats

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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: 1c0d32fde5 ("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>
This commit is contained in:
Eric Dumazet 2018-02-22 19:45:27 -08:00 committed by David S. Miller
parent 2217009443
commit a5f7add332
1 changed files with 1 additions and 0 deletions
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net/core/gen_estimator.c
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@ -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);