linux-kernel - [PATCH] pkt_sched: rate overflow fix

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Date:	Tue, 2 Jul 2013 18:39:54 +0800
From:	Yang Yingliang <yangyingliang@...wei.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	<chenweilong@...wei.com>
CC:	David Howells <dhowells@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	<linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: [PATCH] pkt_sched: rate overflow fix

Use bonding to aggregate two 82599 nics which have 4 ports and max rate is 40gbit.
Then set rate to 35gbit, the rate is overflow.

tc qdisc add dev $bond root handle 1: \
tbf latency 50ms burst 35mb rate 35gbit mtu 64k

tc qdisc show dev $bond
qdisc tbf 1: root refcnt 2 rate 640262Kbit burst 35Mb lat 50.0ms

iperf -c host -t 30 -i 10
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec   764 MBytes   641 Mbits/sec
[  3] 10.0-20.0 sec   730 MBytes   612 Mbits/sec

Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 include/uapi/linux/pkt_sched.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/linux/pkt_sched.h b/include/uapi/linux/pkt_sched.h
index 32aef0a..261042c 100644
--- a/include/uapi/linux/pkt_sched.h
+++ b/include/uapi/linux/pkt_sched.h
@@ -79,7 +79,7 @@ struct tc_ratespec {
        unsigned short  overhead;
        short           cell_align;
        unsigned short  mpu;
-       __u32           rate;
+       __u64           rate;
 };

 #define TC_RTAB_SIZE   1024
-- 
1.7.12

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