What I know is that this is working in azure kernels 4.15 series, but
not in 4.18 since we got the dailies with it for Cosmic.

>From the ubuntu kernel tree if these versions are separate branches then
I don't know how a bisect would work...

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  Accelerated networking (SR-IOV VF) broken in 18.10 daily

Status in linux package in Ubuntu:
Status in linux-azure package in Ubuntu:
Status in linux source package in Cosmic:

Bug description:
  While testing Ubuntu 18.10 daily from cloud-images repo, on Azure, we 
discovered that accelerated networking wasn’t working inside the VM.
  No VF shows up inside the VM and lspci didn’t show any Mellanox drivers in 
  We tested the daily build on Hyper-V also, but there the Mellanox VF is 
functional, with the same mlx4 drivers.

  To give more details about this:
  • No mellanox logs are showing up in dmesg or syslog.
  • Modinfo mlx4_core/mlx4_en finds the module, but lsmod doesn’t show it as 
loaded, although Accelerated Networking is enabled for the Azure VM, so this 
should happen transparently.
  • Modprobe  -r mlx4_core && modprobe mlx4_core is giving 0 exit code, but 
nothing really happens. And no Mellanox messages are logged in dmesg/syslog.
  - There are no entries in the logs to show anything about the drivers or 
netvsc/pci-hyperv that might relate to this issue.

  Kernel: 4.18.0-7-generic

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