The Prodrive Hermes mainboard has four i211 Ethernet NICs and an i210
Ethernet NIC, but their numbering isn't consistent with the PCIe root
port function numbers. With only a M.2 SSD plugged in, Linux uses the
following names:
PHY 0 ---> enp6s0
PHY 1 ---> enp4s0
PHY 2 ---> enp3s0
PHY 3 ---> enp1s0
PHY 4 ---> enp2s0
These names change after adding or removing PCIe devices in slots
connected to root ports that get enumerated before the NICs' root
ports, because the assignment of secondary bus numbers depends on
the enumeration order. Because of this, the "predictable" network
interface names are not at all predictable, which is awful.
To avoid this, describe the NICs using SMBIOS Type41 entries with the
correct instance numbers. With this patch, Linux uses these names:
PHY 0 ---> eno0
PHY 1 ---> eno1
PHY 2 ---> eno2
PHY 3 ---> eno3
PHY 4 ---> eno4
No matter what PCIe devices are present, these names don't change.
Change-Id: I7a527298f84172f9135006083ad7e748dcc27911
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58628
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
b207f3f370