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Diffstat (limited to 'results/scraper/launchpad-without-comments/1888818')
| -rw-r--r-- | results/scraper/launchpad-without-comments/1888818 | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/results/scraper/launchpad-without-comments/1888818 b/results/scraper/launchpad-without-comments/1888818 new file mode 100644 index 00000000..2604a643 --- /dev/null +++ b/results/scraper/launchpad-without-comments/1888818 @@ -0,0 +1,49 @@ +Multi-queue vhost-user fails to reconnect with qemu version >=4.2 + +Test Environment: +DPDK version: DPDK v20.08 +Other software versions: qemu4.2, qemu5.0. +OS: Linux 4.15.0-20-generic +Compiler: gcc (Ubuntu 7.3.0-16ubuntu3) 8.4.0 +Hardware platform: Purley. +Test Setup +Steps to reproduce +List the steps to reproduce the issue. + +Test flow +========= +1. Launch vhost-user testpmd as port0 with 2 queues: + +./x86_64-native-linuxapp-gcc/app/testpmd -l 2-4 -n 4 \ + --file-prefix=vhost --vdev 'net_vhost0,iface=vhost-net,queues=2,client=1' -- -i --txd=1024 --rxd=1024 --txq=2 --rxq=2 +testpmd>start + +3. Launch qemu with virtio-net: + + taskset -c 13 \ + qemu-system-x86_64 -name us-vhost-vm1 \ + -cpu host -enable-kvm -m 2048 -object memory-backend-file,id=mem,size=2048M,mem-path=/mnt/huge,share=on \ + -numa node,memdev=mem \ + -mem-prealloc -monitor unix:/tmp/vm2_monitor.sock,server,nowait -netdev user,id=yinan,hostfwd=tcp:127.0.0.1:6005-:22 -device e1000,netdev=yinan \ + -smp cores=1,sockets=1 -drive file=/home/osimg/ubuntu16.img \ + -chardev socket,id=char0,path=./vhost-net,server \ + -netdev type=vhost-user,id=mynet1,chardev=char0,vhostforce,queues=2 \ + -device virtio-net-pci,mac=52:54:00:00:00:01,netdev=mynet1,mrg_rxbuf=on,csum=on,gso=on,host_tso4=on,guest_tso4=on,mq=on,vectors=15 \ + -vnc :10 -daemonize + +6. Quit testpmd and restart vhost-user : + +testpmd>quit +./x86_64-native-linuxapp-gcc/app/testpmd -l 2-4 -n 4 \ + --file-prefix=vhost --vdev 'net_vhost0,iface=vhost-net,queues=2,client=1' -- -i --txd=1024 --rxd=1024 --txq=2 --rxq=2 + + +Expected Result: +After the vhost-user is killed then re-launched, the virtio-net can connect back to vhost-user again. + +Actual Result: +Vhost-user relaunch failed with continous log printed"VHOST_CONFIG: Processing VHOST_USER_SET_FEATURES failed. + +Analysis: +This is a regression bug, bad commit: c6beefd674f +When vhost-user quits, QEMU doesnot save acked features for each virtio-net after vhost-user quits. When vhost-user reconnects to QEMU, QEMU sends two different features(one is the true acked feature while the another is 0x40000000) to vhost-user successively which causing vhost-user exits abnormally. \ No newline at end of file |