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[Bug 1581132] Re: [Xenial] net: updates to ethtool and virtio_net for speed/duplex support


Brad, this isn't really a bug, but a feature request.

Before my patches, it was not possible to get or set link speed on a
virtio_net backed device.

$ sudo ethtool enp0s8 
Settings for enp0s8:
	Link detected: yes
$ sudo ethtool -s enp0s8 speed 100000 duplex full 
Cannot get current device settings: Operation not supported
  not setting speed
  not setting duplex
$ ethtool -i enp0s8 
driver: virtio_net
version: 1.0.0
bus-info: 0000:00:08.0
supports-statistics: no
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no

As demonstrated in my description this is now possible.

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  [Xenial] net: updates to ethtool and virtio_net for speed/duplex

Status in linux package in Ubuntu:
Status in linux source package in Xenial:

Bug description:
  Post 4.4, several changes landed upsteam to allow users to set interface
  speed for virtio_net backed devices.  This feature is extremely useful
  for those doing large-scale networking simulations where Ubuntu-based
  VMs are used to simulate hosts.  Not only does it allow hosts to report
  the same speed in simulations for monitoring tools, but it is required
  to simulate 802.3ad bonding where link-speed is reported to the peer
  device.  Without proper speed setting there are cases where establishing
  LACP adjacency is not possible.  

  After this patch setting the link speed and duplex now works just as one would
  expect.  I'm running the kernel that contains this patch for these commands:

  $ sudo ethtool -s enp0s8 speed 100000 duplex full 
  $ sudo ethtool enp0s8
  Settings for enp0s8:
  	Supported ports: [ ]
  	Supported link modes:   Not reported
  	Supported pause frame use: No
  	Supports auto-negotiation: No
  	Advertised link modes:  Not reported
  	Advertised pause frame use: No
  	Advertised auto-negotiation: No
  	Speed: 100000Mb/s
  	Duplex: Full
  	Port: Other
  	PHYAD: 0
  	Transceiver: internal
  	Auto-negotiation: off
  	Link detected: yes

  I've already submitted patches to the kernel-team mailing list.  Those
  patches can be found in this thread: https://lists.ubuntu.com/archives

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