This really sucks. But it's real easy to make and install:
You'll need
Packages: linux & linux-header WITH MATCHING VERSIONS
Then get into the directory with your alx sources and do:
make -C /usr/lib/modules/$(uname -r)/build/ M=$(pwd) modules
make -C /usr/lib/modules/$(uname -r)/build/ M=$(pwd) modules_install
cp alx.ko /lib/modules/$(uname -r)/kernel/drivers/net/ethernet/atheros/alx/alx.ko
sudo rmmod alx
sudo insmod /lib/modules/$(uname -r)/kernel/drivers/net/ethernet/atheros/alx/alx.ko
sudo depmod
Tun and done!
The above sources were taken from kernel version 4.12
They appear to work fine on 4.17.2 as well
And here is the faulty commit:
The above sources were obtained by manually modifying 4.12 alx driver with the above commit.
Oh, and this is all GPL-3 licensed. See the "LICENSE" for more detail