Error -110 is kernel `-ETIMEDOUT`.
The driver and firmware are fighting a race condition over
`sriov_drivers_autoprobe` :)
The kernel auto-binds `mlx5_core` to VFs the instant they spawn, while
Netplan simultaneously tries to unbind them and switch devlink to
`switchdev`, choking the firmware semaphore.
Fix it by disabling autoprobe before allocating VFs:
echo 0 | sudo tee
/sys/class/net/<PF_IFACE>/device/sriov_drivers_autoprobe
Or via `/etc/udev/rules.d/99-mlx-sriov.rules`:
ACTION=="add", SUBSYSTEM=="net", DRIVERS=="mlx5_core",
ATTR{device/sriov_drivers_autoprobe}="0"
Once autoprobe is off, devlink flips to switchdev cleanly and the rebind
service succeeds ;)
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https://bugs.launchpad.net/bugs/2166228
Title:
Mellanox NIC is unable to enter switchdev mode
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