netdev - Re: mlx5_vdpa problem

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Date:   Thu, 29 Oct 2020 14:45:44 +0200
From:   Eli Cohen <elic@...dia.com>
To:     wenxu <wenxu@...oud.cn>
CC:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: mlx5_vdpa problem

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
> 
> 
>