https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270644
Bug ID: 270644
Summary: if_bnxt: IPv6 udp traffic always routed to Tx queue 0
on BCM574xx/BCM575xx controllers
Product: Base System
Version: 12.3-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
BCM574xx/BCM575xx controllers are managed by "if_bnxt" driver module. I am
observing an issue with these controllers while running IPv6 UDP traffic. The
traffic is always routed to Tx queue 0 even though more than one Tx queues are
configured.
Network topology: SUT1(BCM574xx) <---> Switch <---> SUT2/(BCM574xx)
Steps to reproduce:
1. Run iperf server on SUT2:
iperf3 -s
2. Run iperf client on SUT1(System under test):
iperf3 -c ::<SUT2_address> -P 32 -t 3600 -l 1000 -w 1000 -u
3. Checked Tx packet stats from sysctl and observed that all packets are routed
to txq0.
# sysctl dev.bnxt.2.hwstats | grep ucast_pkts | grep txq
dev.bnxt.2.hwstats.txq9.ucast_pkts: 0
dev.bnxt.2.hwstats.txq8.ucast_pkts: 0
dev.bnxt.2.hwstats.txq7.ucast_pkts: 0
dev.bnxt.2.hwstats.txq6.ucast_pkts: 0
dev.bnxt.2.hwstats.txq5.ucast_pkts: 0
dev.bnxt.2.hwstats.txq4.ucast_pkts: 0
dev.bnxt.2.hwstats.txq3.ucast_pkts: 0
dev.bnxt.2.hwstats.txq2.ucast_pkts: 0
dev.bnxt.2.hwstats.txq1.ucast_pkts: 6
dev.bnxt.2.hwstats.txq0.ucast_pkts: 105706
Expected results:
IPv6 udp traffic should be fairly distributed among all Tx queues.
Note:
The same issue is not observed with IPv4 UDP traffic.
Selection of Tx queue is done by FreeBSD "iflib" layer.
Is it a iflib layer issue ? or the driver missed to do certain settings ?
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