netdev - [PATCH] sch: add missing u64 in psched_ratecfg

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Message-ID: <10857839.dV42UeFzbk@tuxracer.localdomain>
Date:	Wed, 27 Mar 2013 17:41:59 +0200
From:	Sergey Popovich <popovich_sergei@...l.ru>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"vger.kernel.org " <netdev@...r.kernel.org>
Subject: [PATCH] sch: add missing u64 in psched_ratecfg_precompute()

It seems that commit

commit 292f1c7ff6cc10516076ceeea45ed11833bb71c7
Author: Jiri Pirko <jiri@...nulli.us>
Date:   Tue Feb 12 00:12:03 2013 +0000

    sch: make htb_rate_cfg and functions around that generic

adds little regression.

Before:

# tc qdisc add dev eth0 root handle 1: htb default ffff
# tc class add dev eth0 classid 1:ffff htb rate 5Gbit
# tc -s class show dev eth0
class htb 1:ffff root prio 0 rate 5000Mbit ceil 5000Mbit burst 625b cburst 
625b 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 rate 0bit 0pps backlog 0b 0p requeues 0 
 lended: 0 borrowed: 0 giants: 0
 tokens: 31 ctokens: 31

After:

# tc qdisc add dev eth0 root handle 1: htb default ffff
# tc class add dev eth0 classid 1:ffff htb rate 5Gbit
# tc -s class show dev eth0
class htb 1:ffff root prio 0 rate 1544Mbit ceil 1544Mbit burst 625b cburst 
625b
 Sent 5073 bytes 41 pkt (dropped 0, overlimits 0 requeues 0)
 rate 1976bit 2pps backlog 0b 0p requeues 0
 lended: 41 borrowed: 0 giants: 0
 tokens: 1802 ctokens: 1802

This probably due to lost u64 cast of rate parameter in 
psched_ratecfg_precompute() (net/sched/sch_generic.c).

Signed-off-by: Sergey Popovich <popovich_sergei@...l.ru>

---
diff -uprN a/net/sched/sch_generic.c b/net/sched/sch_generic.c
--- a/net/sched/sch_generic.c	2013-03-27 14:52:27.419643015 +0200
+++ b/net/sched/sch_generic.c	2013-03-20 12:02:08.569366312 +0200
@@ -921,7 +921,7 @@ void psched_ratecfg_precompute(struct ps
 	u64 mult;
 	int shift;
 
-	r->rate_bps = rate << 3;
+	r->rate_bps = (u64)rate << 3;
 	r->shift = 0;
 	r->mult = 1;
 	/*

-- 
SP5474-RIPE
Sergey Popovich
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