[Bug 1853592] [NEW] hw-tc-offload not reliable with VXLAN

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OVS 2.12

Linux 5.3 from hwe edge

Connect-X 5 running latest firmware from Mellanox.

Overlay networking configured with VXLAN for project networking.

Some instances successfully DHCP, some don't.

For those that don't:

compute:

11:51:24.926581 IP bond1.2925.node-laveran.maas.58901 > bond1.2925.node-lepaute.maas.4789: VXLAN, flags [I] (0x08), vni 1233
IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from fa:16:3e:e8:59:f3 (oui Unknown), length 300

gateway:

11:50:44.010864 IP bond1.2925.node-laveran.maas.58901 > bond1.2925.node-lepaute.maas.4789: VXLAN, flags [I] (0x08), vni 1233
IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from fa:16:3e:e8:59:f3 (oui Unknown), length 300
11:50:44.011196 IP bond1.2925.node-lepaute.maas.55067 > bond1.2925.node-laveran.maas.4789: VXLAN, flags [I] (0x08), vni 1233
IP 172.16.0.2.bootps > 172.16.2.236.bootpc: BOOTP/DHCP, Reply, length 328

The response is send from the gateway unit to the compute unit, but is
never seen in the tcpdump.

If hardware encap is disabled on the two underlying ports/the card,
traffic flow is seen and all instances correctly DHCP configure on boot.

 sudo ethtool -K enp3s0f0 hw-tc-offload off
 sudo ethtool -K enp3s0f1 hw-tc-offload off

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-5.3.0-23-generic 5.3.0-23.25~18.04.1
ProcVersionSignature: Ubuntu 5.3.0-23.25~18.04.1-generic 5.3.7
Uname: Linux 5.3.0-23-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
Date: Fri Nov 22 12:29:20 2019
ProcEnviron:
 TERM=screen-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-signed-hwe-edge
UpgradeStatus: No upgrade log present (probably fresh install)
--- 
ProblemType: Bug
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116,  1 Nov 19 16:45 seq
 crw-rw---- 1 root audio 116, 33 Nov 19 16:45 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
DistroRelease: Ubuntu 18.04
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lsusb:
 Bus 002 Device 002: ID 8087:8002 Intel Corp. 
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 001 Device 003: ID 413c:a001 Dell Computer Corp. Hub
 Bus 001 Device 002: ID 8087:800a Intel Corp. 
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. PowerEdge R630
Package: linux (not installed)
PciMultimedia:
 
ProcEnviron:
 TERM=screen-256color
 PATH=(custom, no user)
 LANG=C.UTF-8
 SHELL=/bin/bash
ProcFB: 0 mgag200drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.3.0-23-generic root=UUID=2ff5e234-ee62-4bce-8266-cd9aa78c532f ro intel_iommu=on iommu=pt probe_vf=0
ProcVersionSignature: Ubuntu 5.3.0-23.25~18.04.1-generic 5.3.7
RelatedPackageVersions:
 linux-restricted-modules-5.3.0-23-generic N/A
 linux-backports-modules-5.3.0-23-generic  N/A
 linux-firmware                            1.173.12
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
Tags:  bionic uec-images
Uname: Linux 5.3.0-23-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
 
_MarkForUpload: True
dmi.bios.date: 11/08/2016
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.3.4
dmi.board.name: 02C2CP
dmi.board.vendor: Dell Inc.
dmi.board.version: A03
dmi.chassis.type: 23
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr2.3.4:bd11/08/2016:svnDellInc.:pnPowerEdgeR630:pvr:rvnDellInc.:rn02C2CP:rvrA03:cvnDellInc.:ct23:cvr:
dmi.product.name: PowerEdge R630
dmi.product.sku: SKU=NotProvided;ModelName=PowerEdge R630
dmi.sys.vendor: Dell Inc.

** Affects: openvswitch (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug apport-collected bionic hwoffload third-party-packages uec-images
-- 
hw-tc-offload not reliable with VXLAN
https://bugs.launchpad.net/bugs/1853592
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