20

My server has two 1-Gbit and two 10-Gbit onboard network cards.

I need to disable the 1-Gbit network cards completely, so that ifconfig -a does not show them.

The network cards use different kernel modules. The 10-Gbit use ixgbe, and the 1-Gbit use igb.

01:00.1 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)
Subsystem: Dell Ethernet 10G 4P X520/I350 rNDC
Kernel driver in use: ixgbe

05:00.1 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)
Subsystem: Dell I350 Gigabit Network Connection
Kernel driver in use: igb 

Both ixgbe and igb are compiled statically in the kernel (not as a loadable module). I need to disable the module using the kernel boot parameters.

I have tried appending the following to my kernel, but it has no effect:

igb.blacklist=yes
igb.enable=0
igb.disable=yes

the igb network cards are still showing

How can I disable igb completely ?

29

You should be able to blacklist the igb “module”, even when built-in, by blacklisting its initialisation function: add

initcall_blacklist=igb_init_module

to your kernel’s boot parameters.

See How do I disable I2C Designware support when it's not built as a module? for background information. The general recipe here is to look for the module in the kernel source code, and look for functions which have the __init attribute — there should only be one readily identifiable as the main initialisation function (typically referred to in a module_init declaration). Blacklist that, and the driver won’t be initialised.

  • 4
    For those to whom it matters, the initcall_blacklist parameter appeared in Linux 3.16. – Ruslan Sep 11 '18 at 5:55
  • is <modulename>_init_module the canonical name for each and everything that can be built as a module? – Bananguin Sep 13 '18 at 11:15
  • @Bananguin unfortunately not, there are quite a few called ..._init_module or ..._module_init but they don’t all follow those patterns. – Stephen Kitt Sep 13 '18 at 13:30

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.