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Date: Wed, 27 Jul 2022 08:48:04 -0400
From: Brian Hutchinson <b.hutchman@...il.com>
To: netdev@...r.kernel.org
Subject: Re: Bonded multicast traffic causing packet loss when using DSA with
Microchip KSZ9567 switch
On Mon, Jul 25, 2022 at 5:35 PM Florian Fainelli <f.fainelli@...il.com> wrote:
.
.
.
> This is a red herring, we cannot tell the network stack without much special casing that the DSA network device must only transport tagged traffic to/from the switch, so the IPv6 stack still happily generates a link local address for your adapter.
>
> Any chance of getting the outputs of ethtool -S for lan1 and lan2, and eth0 so we could possibly glean something from the hardware maintained statistics?
>
As requested, statistics below:
I power cycled my board, ran my script to setup active-backup bond and
repeated the iperf test to obtain requested statistics.
Bond setup script basically does:
# Load bonding kernel module
modprobe bonding
# Bring up CPU interface (cpu to switch port 7 - the RGMII link)
ip link set eth0 up
# Create a bond
echo +bond1 > /sys/class/net/bonding_masters
# Set mode to active-backup (redundancy failover)
echo active-backup > /sys/class/net/bond1/bonding/mode
# Set time it takes (in ms) for slave to move when a link goes down
echo 1000 > /sys/class/net/bond1/bonding/miimon
# Add slaves to bond
echo +lan1 > /sys/class/net/bond1/bonding/slaves
echo +lan2 > /sys/class/net/bond1/bonding/slaves
# Set IP and netmask of the bond
ip addr add 192.168.1.6/24 dev bond1
# And bring bond up. Pings and network connectivity should work now
ip link set bond1 up
Things I noticed in the data:
1. I'm getting rx_discards which in Microchip data sheet are called
RxDropPackets which are defined as "RX packets dropped due to lack of
resources." I don't know what that means or how to fix it.
2. ifconfig stats show dropped counts for bond1 and lan2 interface.
3. lan1 was active interface during the test.
On PC I run iperf -s -u -B 239.0.0.67%enp4s0 -i 1
On my board I run iperf -B 192.168.1.6 -c 239.0.0.67 -u --ttl 3000 -t
30 -b 1M -i 1 (didn't let it run the full time, stopped it with
ctrl-c)
Ping from PC to board while iperf is running on my board shows packet loss:
ping 192.168.1.6
PING 192.168.1.6 (192.168.1.6) 56(84) bytes of data.
64 bytes from 192.168.1.6: icmp_seq=9 ttl=64 time=2.33 ms
64 bytes from 192.168.1.6: icmp_seq=35 ttl=64 time=4.53 ms
64 bytes from 192.168.1.6: icmp_seq=36 ttl=64 time=2.03 ms
64 bytes from 192.168.1.6: icmp_seq=37 ttl=64 time=2.01 ms
64 bytes from 192.168.1.6: icmp_seq=38 ttl=64 time=1.99 ms
64 bytes from 192.168.1.6: icmp_seq=39 ttl=64 time=2.00 ms
64 bytes from 192.168.1.6: icmp_seq=40 ttl=64 time=1.29 ms
64 bytes from 192.168.1.6: icmp_seq=41 ttl=64 time=2.05 ms
64 bytes from 192.168.1.6: icmp_seq=42 ttl=64 time=1.98 ms
64 bytes from 192.168.1.6: icmp_seq=43 ttl=64 time=1.98 ms
64 bytes from 192.168.1.6: icmp_seq=44 ttl=64 time=1.95 ms
64 bytes from 192.168.1.6: icmp_seq=45 ttl=64 time=2.00 ms
64 bytes from 192.168.1.6: icmp_seq=46 ttl=64 time=2.03 ms
64 bytes from 192.168.1.6: icmp_seq=47 ttl=64 time=1.95 ms
64 bytes from 192.168.1.6: icmp_seq=48 ttl=64 time=1.95 ms
64 bytes from 192.168.1.6: icmp_seq=49 ttl=64 time=1.96 ms
64 bytes from 192.168.1.6: icmp_seq=50 ttl=64 time=2.00 ms
64 bytes from 192.168.1.6: icmp_seq=51 ttl=64 time=2.00 ms
64 bytes from 192.168.1.6: icmp_seq=52 ttl=64 time=1.97 ms
64 bytes from 192.168.1.6: icmp_seq=53 ttl=64 time=1.96 ms
64 bytes from 192.168.1.6: icmp_seq=54 ttl=64 time=1.97 ms
64 bytes from 192.168.1.6: icmp_seq=55 ttl=64 time=2.03 ms
64 bytes from 192.168.1.6: icmp_seq=56 ttl=64 time=1.29 ms
64 bytes from 192.168.1.6: icmp_seq=57 ttl=64 time=2.04 ms
^C
--- 192.168.1.6 ping statistics ---
57 packets transmitted, 24 received, 57.8947% packet loss, time 56807ms
rtt min/avg/max/mdev = 1.285/2.054/4.532/0.558 ms
Board stats for eth0, lan1 and lan2:
# ethtool -S eth0 | grep -v ': 0'
NIC statistics:
tx_packets: 2382
tx_broadcast: 4
tx_multicast: 2269
tx_65to127byte: 156
tx_128to255byte: 30
tx_1024to2047byte: 2196
tx_octets: 3354271
IEEE_tx_frame_ok: 2382
IEEE_tx_octets_ok: 3354271
rx_packets: 2435
rx_broadcast: 76
rx_multicast: 2250
rx_65to127byte: 222
rx_128to255byte: 17
rx_1024to2047byte: 2196
rx_octets: 3354319
IEEE_rx_frame_ok: 2435
IEEE_rx_octets_ok: 3354319
p06_rx_bcast: 4
p06_rx_mcast: 2269
p06_rx_ucast: 109
p06_rx_65_127: 156
p06_rx_128_255: 30
p06_rx_1024_1522: 2196
p06_tx_bcast: 76
p06_tx_mcast: 2250
p06_tx_ucast: 109
p06_rx_total: 3354271
p06_tx_total: 3354319
# ethtool -S lan1 | grep -v ': 0'
NIC statistics:
tx_packets: 2326
tx_bytes: 3334064
rx_packets: 138
rx_bytes: 10592
rx_bcast: 63
rx_mcast: 31
rx_ucast: 133
rx_64_or_less: 75
rx_65_127: 139
rx_128_255: 13
tx_bcast: 4
tx_mcast: 2245
tx_ucast: 77
rx_total: 21324
tx_total: 3343572
rx_discards: 89
# ethtool -S lan2 | grep -v ': 0'
NIC statistics:
rx_packets: 2241
rx_bytes: 3293222
rx_bcast: 27
rx_mcast: 2214
rx_64_or_less: 26
rx_65_127: 11
rx_128_255: 8
rx_1024_1522: 2196
rx_total: 3333560
ifconfig stats:
# ifconfig
bond1: flags=5187<UP,BROADCAST,RUNNING,MASTER,MULTICAST> mtu 1500 metric 1
inet 192.168.1.6 netmask 255.255.255.0 broadcast 0.0.0.0
inet6 fd1c:a799:6054:0:60e2:5ff:fe75:6716 prefixlen 64
scopeid 0x0<global>
inet6 fe80::60e2:5ff:fe75:6716 prefixlen 64 scopeid 0x20<link>
ether 62:e2:05:75:67:16 txqueuelen 1000 (Ethernet)
RX packets 2557 bytes 3317974 (3.1 MiB)
RX errors 0 dropped 2 overruns 0 frame 0
TX packets 2370 bytes 3338160 (3.1 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1506 metric 1
inet6 fe80::f21f:afff:fe6b:b218 prefixlen 64 scopeid 0x20<link>
ether f0:1f:af:6b:b2:18 txqueuelen 1000 (Ethernet)
RX packets 2557 bytes 3371671 (3.2 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2394 bytes 3345891 (3.1 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lan1: flags=6211<UP,BROADCAST,RUNNING,SLAVE,MULTICAST> mtu 1500 metric 1
ether 62:e2:05:75:67:16 txqueuelen 1000 (Ethernet)
RX packets 248 bytes 19384 (18.9 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2370 bytes 3338160 (3.1 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lan2: flags=6211<UP,BROADCAST,RUNNING,SLAVE,MULTICAST> mtu 1500 metric 1
ether 62:e2:05:75:67:16 txqueuelen 1000 (Ethernet)
RX packets 2309 bytes 3298590 (3.1 MiB)
RX errors 0 dropped 1 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 metric 1
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 1 bytes 112 (112.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1 bytes 112 (112.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
# cat /proc/net/bonding/bond1
Ethernet Channel Bonding Driver: v5.10.69-g472c99a84cb6-dirty
Bonding Mode: fault-tolerance (active-backup)
Primary Slave: None
Currently Active Slave: lan1
MII Status: up
MII Polling Interval (ms): 1000
Up Delay (ms): 0
Down Delay (ms): 0
Peer Notification Delay (ms): 0
Slave Interface: lan1
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: f0:1f:af:6b:b2:18
Slave queue ID: 0
Slave Interface: lan2
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: f0:1f:af:6b:b2:18
Slave queue ID: 0
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