I've went ahead and added a kernel task for this.
So the work here is:
 * ml4x_en kernel module needs to specify pci-ids.  currently the ml4x_core 
specifies pci-ids, so it is what gets automatically loaded.
 * kernel needs to add ml4x_net to the list so it gets collected as a network 
driver (bug 1015339)
 * maas ephemeral image build process needs to build initramfs with 
'MODULES=netboot'
 * maas ephemeral image build process will create initramfs that works around 
this specific network driver issue.


** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu)
       Status: New => Confirmed

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Summary changed:

- Mellanox kernel module not loaded on ephemeral images
+ Mellanox mlx4_en network driver is not automatically loaded

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https://bugs.launchpad.net/bugs/1115710

Title:
  Mellanox mlx4_en network driver is not automatically loaded

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