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Revert "dpif-netdev: includes microsecond delta in meter bucket calculation".

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This reverts commit 5c41c31ebd.

Use the pktgen-dpdk to test the commit 5c41c31ebd
("dpif-netdev: includes microsecond delta in meter bucket calculation"),
it does't work as expected. And it broken the meter function (e.g. set
rate 200Mbps, the rate watched was 400Mbps). To reproduce it:

 $ ovs-vsctl add-br br-int -- set bridge br-int datapath_type=netdev
 $ ovs-ofctl -O OpenFlow13 add-meter br-int \
         "meter=100 kbps burst stats bands=type=drop rate=200000 burst_size=200000"
 $ ovs-ofctl -O OpenFlow13 add-flow br-int \
         "in_port=dpdk0 action=meter:100,output:dpdk1"
 $ pktgen -l 1,3,5,7,9,11,13,15,17,19 -n 8 --socket-mem 4096 \
         --file-prefix pg1 -w 0000:82:00.0 -w 0000:82:00.1 -- \
         -T -P -m "[3/5/7/9/11/13/15].[0-1]" -f meter-test.pkt

 meter-test.pkt:
 | set 0 count 0
 | set 0 size 1500
 | set 0 rate 100
 | set 0 burst 64
 | set 0 sport 1234
 | set 0 dport 5678
 | set 0 prime 1
 | set 0 type ipv4
 | set 0 proto udp
 | set 0 dst ip 1.1.1.2
 | set 0 src ip 1.1.1.1/24
 | set 0 dst mac ec:0d:9a🆎54:0a
 | set 0 src mac ec:0d:9a:bf:df:bb
 | set 0 vlanid 0
 | start 0

Note that the issue that patch 5c41c31ebd was intended to fix was
already fixed by commit:
  42697ca775 ("dpif-netdev: fix meter at high packet rate.")

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
This commit is contained in:
Tonghao Zhang
2020-05-23 18:33:20 +08:00
committed by Ilya Maximets
parent 850e834fa0
commit a4953c5fe3
1 changed files with 0 additions and 5 deletions
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5
lib/dpif-netdev.c
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@@ -6095,7 +6095,6 @@ dp_netdev_run_meter(struct dp_netdev *dp, struct dp_packet_batch *packets_,
struct dp_packet *packet;
long long int long_delta_t; /* msec */
uint32_t delta_t; /* msec */
uint32_t delta_in_us; /* usec */
const size_t cnt = dp_packet_batch_size(packets_);
uint32_t bytes, volume;
int exceeded_band[NETDEV_MAX_BURST];
@@ -6126,9 +6125,6 @@ dp_netdev_run_meter(struct dp_netdev *dp, struct dp_packet_batch *packets_,
Assuming that all racing threads received packets at the same time
to avoid overflow. */
long_delta_t = 0;
delta_in_us = 0;
} else {
delta_in_us = (now - meter->used) % 1000;
}
/* Make sure delta_t will not be too large, so that bucket will not
@@ -6164,7 +6160,6 @@ dp_netdev_run_meter(struct dp_netdev *dp, struct dp_packet_batch *packets_,
/* Update band's bucket. */
band->bucket += delta_t * band->up.rate;
band->bucket += delta_in_us * band->up.rate / 1000;
if (band->bucket > band->up.burst_size) {
band->bucket = band->up.burst_size;
}