netdev - Re: mlx5_vdpa problem

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Date:   Sun, 1 Nov 2020 13:50:02 +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 Fri, Oct 30, 2020 at 03:50:21PM +0800, wenxu wrote:
> Hi Eli,
> 
> 
> Thanks for your reply.
> 
> 
> I update the firmware to the lasted one
> 
> firmware-version: 22.28.4000 (MT_0000000430)
> 
> 
> I find there are the same problems as my description.
> 
> It is the same for the test what your suggestion.
> 
> I did the experiment with two hosts so the host the
> representor for your VF and the uplink representor are connected to an
> ovs switch and other host is configured with ip address 10.0.0.7/24.
> 
> And the ovs enable hw-offload, So the packet don't go through rep port of VF.
> But there are the same problems. I think it maybe a FW bug. Thx.

I will refer you to firmware engineer to work with.

> 
> On 10/29/2020 8:45 PM, Eli Cohen wrote:
> > 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
> >>
> >>
> >>