/etc/modprobe.d/mlx4.conf is in kmod 22-1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # mlx4_core gets automatically loaded, load mlx4_en also (LP: #1115710)
softdep mlx4_core post: mlx4_en
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