Fail to build Linux kernel module with kernel upper than 4.8

[Jakub Pavlik]

On updated Ubuntu Xenial, the kernel module fails to build:

DKMS make.log for vrouter-3.0.2+0~1478703730.29~1.3bf0f9d for kernel 4.8.0-34-generic (x86_64)
Thu Jan 12 20:12:43 UTC 2017
make: Entering directory '/var/lib/dkms/vrouter/3.0.2+0~1478703730.29~1.3bf0f9d/build'
make -C /lib/modules/4.8.0-34-generic/build M=/var/lib/dkms/vrouter/3.0.2+0~1478703730.29~1.3bf0f9d/build modules
make[1]: Entering directory '/usr/src/linux-headers-4.8.0-34-generic'
  CC [M] /var/lib/dkms/vrouter/3.0.2+0~1478703730.29~1.3bf0f9d/build/linux/vr_host_interface.o
/var/lib/dkms/vrouter/3.0.2+0~1478703730.29~1.3bf0f9d/build/linux/vr_host_interface.c: In function ‘linux_if_get_settings’:
/var/lib/dkms/vrouter/3.0.2+0~1478703730.29~1.3bf0f9d/build/linux/vr_host_interface.c:1567:21: error: implicit declaration of function ‘__ethtool_get_settings’ [-Werror=implicit-function-declaration]
         if (!(ret = __ethtool_get_settings(dev, &cmd))) {
                     ^
cc1: some warnings being treated as errors
scripts/Makefile.build:289: recipe for target '/var/lib/dkms/vrouter/3.0.2+0~1478703730.29~1.3bf0f9d/build/linux/vr_host_interface.o' failed
make[2]: *** [/var/lib/dkms/vrouter/3.0.2+0~1478703730.29~1.3bf0f9d/build/linux/vr_host_interface.o] Error 1
Makefile:1491: recipe for target '_module_/var/lib/dkms/vrouter/3.0.2+0~1478703730.29~1.3bf0f9d/build' failed
make[1]: *** [_module_/var/lib/dkms/vrouter/3.0.2+0~1478703730.29~1.3bf0f9d/build] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-4.8.0-34-generic'
Makefile:87: recipe for target 'default' failed
make: *** [default] Error 2
make: Leaving directory '/var/lib/dkms/vrouter/3.0.2+0~1478703730.29~1.3bf0f9d/build'

It must be something related to:
https://github.com/Juniper/contrail-vrouter/blob/master/linux/vr_host_interface.c#L1596

[Sergey Matov (smatov)]

Hello Raja.

We've got same bug before with kernel 4.6 https://bugs.launchpad.net/juniperopenstack/trunk/+bug/1633387
Does this bug reproduced even with https://review.opencontrail.org/#/c/24969 in master branch code?

[Jakub Pavlik (pavlk-jakub)]

Yes, you are right. This is duplication of bug #1633387