Enable enaSupport attribute on EC2 AMIs

[José Martínez]

The Ubuntu kernel now ships with the AWS ENA driver (see bug #1635721) for enhanced networking on the most recent EC2 instance types. However, this driver is never used because the "EnaSupport" attribute is not set in the AMIs.

Instances with ENA do not support the Intel 82599 VF driver, so these instances will fall back to the default and slow "vif" driver.

$ curl http://169.254.169.254/latest/meta-data/instance-type
r4.2xlarge

$ modinfo ena
filename: /lib/modules/4.4.0-62-generic/kernel/drivers/net/ethernet/amazon/ena/ena.ko
version: 1.0.2
license: GPL
description: Elastic Network Adapter (ENA)
author: Amazon.com, Inc. or its affiliates
srcversion: 881520E877FD2888486C76A
alias: pci:v00001D0Fd0000EC21sv*sd*bc*sc*i*
alias: pci:v00001D0Fd0000EC20sv*sd*bc*sc*i*
alias: pci:v00001D0Fd00001EC2sv*sd*bc*sc*i*
alias: pci:v00001D0Fd00000EC2sv*sd*bc*sc*i*
depends:
intree: Y
vermagic: 4.4.0-62-generic SMP mod_unload modversions
parm: debug:Debug level (0=none,...,16=all) (int)

$ ethtool -i eth0
driver: vif
version:
firmware-version:
expansion-rom-version:
bus-info: vif-0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no

$ aws ec2 describe-images --image-ids ami-98ecb7fe --query "Images[].EnaSupport"
[]

[Dan Watkins (oddbloke)]

Hi José,

Thanks for reporting this bug! We're currently working through the changes required to our publication infrastructure to make this happen, but rest assured that this will be coming soon.

Thanks,

Dan

[Mathias Bogaert (mathias-bogaert)]

Hi Dan, any progress on this one? I see images being pushed daily now. Thanks

[Dan Watkins (oddbloke)]

Hi!

This is still working its way through; we've had a couple of set-backs internally, but it should be landing Real Soon Now(TM). Apologies for the delay!

Dan

[José Martínez (xosemp)]

I'd like to raise awareness of a comment from AWS on bug #1668129 that might also impact ENA:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1668129/comments/25

I didn't have any issues with ENA (or at least I didn't notice them) on my limited testing with it. But I think it's worth considering that enabling ENA on the AMIs right now may cause issues until that bug is fixed.

[Philip Roche (philroche)]

14.04 Trusty now has ENA attribute set for all serials greater than 20170727