Description of problem:

When applying this nmstate state, the i40e interface will lose link carrier

interfaces:

• name: eno4
  type: ethernet
  state: up
  ethtool:
  pause:
  rx: false
  tx: false
  autoneg: false

The ethtool pause setting is actually the current and also default setting for this i40e NIC.

Version-Release number of selected component (if applicable):

kernel-5.14.0-283.el9.x86_64
NetworkManager-1.42.2-4.el9_2.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Find a server with i40e NIC
2. Apply above nmstate YAML file(change the interface name to match your env):
sudo nmstatectl apply ethtool_pause.yml
3. ip link show eno4

Actual results:

The i40e NIC lose link carrier and link down.

Expected results:

The i40e NIC will not lose link carrier.

Additional info:

Tried with `ip link set eno4 up` then `ethtool --pause eno4 autoneg off rx off tx off`, the link carrier will not lose.

[root@computesriovoffload-0 fge]# ethtool -i eno4
driver: i40e
version: 5.14.0-283.el9.x86_64
firmware-version: 8.40 0x8000af86 20.5.16
expansion-rom-version:
bus-info: 0000:19:00.3
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes

19:00.3 Ethernet controller: Intel Corporation Ethernet Controller X710 for 10GbE SFP+ (rev 01)

Acceptance criteria:

Given a system administrator configuring a server with i40e NIC and setting the ethtool pause setting to the default values for this i40e NIC.

When the system administrator applies an nmstate YAML file, altering the interface and ethtool pause settings

Then the link carrier for the i40e NIC should not be lost, ensuring the NIC remains accessible.

Definition of done

• The implementation meets the acceptance criteria
• Unit test and integration test are written and passed
• The code is part of a build attached to an errata