ubuntu20.04.2LTS ,ixgbe 5.1.0-K, not working with EF_AF_XDP_ZEROCOPY=1

[density1970]

Hello ,
I have been testing Onload with AF_XDP support on 10 GBe Intel 82599.
my Environment Details:
CPU: Intel(R) Xeon(R) CPU E5-2620 v2 @ 2.10GHz
NIC: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)
OS: Ubuntu 20.04.2 LTS
Kernel: 5.4.0-65-generic

root@xcsc:# ethtool -i enp4s0f1
driver: ixgbe
version: 5.1.0-k
firmware-version: 0x000161ae
expansion-rom-version:
bus-info: 0000:04:00.1
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes

before I enable the EF_AF_XDP_ZEROCOPY to 1 in the latency.opf, my application(onload -p ./conf/latency.opf ./zxTrade) works fine:

Recv tickData(15:29:05): { MkDataCounts: 23840 , TradeDataCounts: 0 , OrderDataCounts: 0 }
Recv tickData(15:30:05): { MkDataCounts: 26224 , TradeDataCounts: 0 , OrderDataCounts: 0 }

after I enable the EF_AF_XDP_ZEROCOPY to 1 in the latency.opf:

onload_set EF_AF_XDP_ZEROCOPY 1

stack can be created:
root@xcsc:# onload_stackdump stacks
#stack-id stack-name pids
1 - 9499

EF_AF_XDP_ZEROCOPY enabled:
root@xcsc:# onload_stackdump lots | grep XDP
EF_XDP_MODE: 0
EF_AF_XDP_ZEROCOPY: 1 (default: 0)
env: EF_AF_XDP_ZEROCOPY=1

but my application(onload -p ./conf/latency.opf ./zxTrade) can not work fine,application show no data packets received;

Recv tickData: { MkDataCounts:0, TradeDataCounts:0, OrderDataCounts:0 }
Recv tickData: { MkDataCounts:0, TradeDataCounts:0, OrderDataCounts:0 }

the thing below drived me crazy:
when I delete "the onload_set EF_AF_XDP_ZEROCOPY 1" in latency.opf, and reload my application, the system crashed, need to reboot.
After the Ubuntu system reboot, dmesg show these message:
root@xcsc:~# dmesg | grep onload
[ 14.229749] [onload] Onload
[ 14.229750] [onload] Copyright 2019-present Xilinx, 2006-2019 Solarflare Communications, 2002-2005 Level 5 Networks
[ 14.489442] onload_cp_server[461]: Spawned daemon process 481
[ 14.813890] synth uevent: /devices/virtual/onload/onload: failed to send uevent
[ 14.813893] onload onload: uevent: failed to send synthetic uevent
[ 14.832521] synth uevent: /devices/virtual/onload_epoll/onload_epoll: failed to send uevent
[ 14.832523] onload_epoll onload_epoll: uevent: failed to send synthetic uevent

Is ixgbe driver 5.1.0-K(come with Ubuntu20.04.2 LTS) is not support AF_XDP, ZEROCOPY or other reason ???

thanks.

[ol-alexandra]

@maciejj-xilinx & I have agreed that it is probably ON-12643/SWNETLINUX-3906 internal bugs.
I'm working on it.