On Thu, Oct 22, 2020 at 06:40:56PM +0800, wenxu wrote: Please make sure your firmware is updated.
https://www.mellanox.com/support/firmware/connectx6dx > > Hi mellanox team, > > > I test the mlx5 vdpa in linux-5.9 and meet several problem. > > > # lspci | grep Ether | grep Dx > b3:00.0 Ethernet controller: Mellanox Technologies MT2892 Family [ConnectX-6 > Dx] > b3:00.1 Ethernet controller: Mellanox Technologies MT2892 Family [ConnectX-6 > Dx] > > # ethtool -i net2 > driver: mlx5e_rep > version: 5.9.0 > firmware-version: 22.28.1002 (MT_0000000430) > expansion-rom-version: > bus-info: 0000:b3:00.0 > supports-statistics: yes > supports-test: no > supports-eeprom-access: no > supports-register-dump: no > supports-priv-flags: no > > > init switchdev: > > > # echo 1 > /sys/class/net/net2/device/sriov_numvfs > # echo 0000:b3:00.2 > /sys/bus/pci/drivers/mlx5_core/unbind > # devlink dev eswitch set pci/0000:b3:00.0 mode switchdev encap enable > > # modprobe vdpa vhost-vdpa mlx5_vdpa > > # ip l set dev net2 vf 0 mac 52:90:01:00:02:13 > # echo 0000:b3:00.2 > /sys/bus/pci/drivers/mlx5_core/bind > > > setup vm: > > # qemu-system-x86_64 -name test -enable-kvm -smp > 16,sockets=2,cores=8,threads=1 -m 8192 -drive > file=./centos7.qcow2,format=qcow2,if=none,id=drive-virtio-disk0 -device > virtio-blk-pci,scsi=off,bus=pci.0,addr=0x7,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 > -netdev type=vhost-vdpa,vhostdev=/dev/vhost-vdpa-0,id=vhost-vdpa0 -device > virtio-net-pci,netdev=vhost-vdpa0,page-per-vq=on,iommu_platform=on,id=net0,bus=pci.0,addr=0x3,disable-legacy=on > -vnc 0.0.0.0:0 > > > In the vm: virtio net device eth0 with ip address 10.0.0.75/24 > > On the host: VF0 rep device pf0vf0 with ip address 10.0.0.7/24 > > > problem 1: > > On the host: > > # ping 10.0.0.75 > > Some times there will be loss packets. > > And in the VM: > > dmesg shows: > > eth0: bad tso: type 100, size: 0 > > eth0: bad tso: type 10, size: 28 > > > So I think maybe the vnet header is not init with 0? And Then I clear the > gso_type, gso_size and flags in the virtio_net driver. There is no packets > dropped. > > > problem 2: > > In the vm: iperf -s > > On the host: iperf -c 10.0.0.75 -t 100 -i 2. > > > The tcp connection can't established for the syn+ack with partail cum but not > handle correct by hardware. > > After I set the csum off for eth0 in the vm, the problem is resolved. > Although the mlx5_vnet support VIRTIO_NET_F_CSUM feature. > > > > problem 3: > > > The iperf perofrmance not stable before I disable the pf0vf0 tso offload > > #ethtool -K pf0vf0 tso off > > > I know the mlx5_vnet did not support feature VIRTIO_NET_F_GUEST_TSO4. But the > hardware can't cut the big tso packet to several small tcp packet and send > to virtio net device? > > > > > BR > > wenxu > > >
