Comment 3 for bug 1635721

Back-port branches:

git://git.launchpad.net/~kamalmostafa/ubuntu/+source/linux/+git/xenial ena-xenial
git://git.launchpad.net/~kamalmostafa/ubuntu/+source/linux/+git/trusty ena-trusty

Positive smoke test results:

----------------------------------------------------------------
(xenial)
client: x1.32xlarge // ens3: ena 1.0.2 // 4.4.0-45-generic #65
server: x1.32xlarge // ens3: ena 1.0.2 // 4.4.0-45-generic #65
 $ nuttcp -i10 -T50 -N5 ip-172-31-31-135
19697.6875 MB / 10.00 sec = 16523.3420 Mbps
20090.1875 MB / 10.00 sec = 16853.0022 Mbps
20254.2500 MB / 10.00 sec = 16990.5337 Mbps
20138.6250 MB / 10.00 sec = 16893.5149 Mbps
20393.5000 MB / 10.00 sec = 17107.3009 Mbps

100603.2500 MB / 50.01 sec = 16875.3968 Mbps 63 %TX 99 %RX 0.29 msRTT

----------------------------------------------------------------
(trusty)
client: x1.32xlarge // eth0: ena 1.0.2 // 3.13.0-100-generic #147
server: x1.32xlarge // eth0: ena 1.0.2 // 3.13.0-100-generic #147
 $ nuttcp -i10 -T50 -N5 ip-172-31-24-46
24085.1875 MB / 10.00 sec = 20203.9823 Mbps
24586.2500 MB / 10.00 sec = 20624.4145 Mbps
24584.2500 MB / 10.00 sec = 20622.7512 Mbps
24581.3125 MB / 10.00 sec = 20620.3345 Mbps
24586.9375 MB / 10.00 sec = 20625.0139 Mbps

122436.6875 MB / 50.00 sec = 20539.8814 Mbps 68 %TX 62 %RX 0.17 msRTT