Add 82-net-auto-link-local.{hwdb,rules} to build system and add BMC USB-to-USB links to hwdb (#40006)

Using systems with ADLINK COM-HPC-ALT, ASRock Rack ALTRAD8UD-1L2T and
AMPONED8-2T/BCM boards, there's an issue due to the internal network
connection between the BMC and host, which runs over USB (i.e. Linux
running on the BMC configures a USB gadget ethernet device, with a link
local address).

With the default configuration on Ubuntu (I'm using 25.10),
NetworkManager repeatedly tries to get an address for the interface
using DHCP, resulting in an "Activation of network connection failed"
notification every minute or two.

Add 82-net-auto-link-local.hwdb and 82-net-auto-link-local.rules to the
build system and update 82-net-auto-link-local.hwdb to add the USB
device vendor/product pairs I've seen on the various systems I have with
Ampere Altra and AmpereOne CPUs.

hwdb.d/82-net-auto-link-local.hwdb

@@ -10,3 +10,9 @@
 usb:v067Bp25A1*
 usb:v067Bp27A1*
  ID_NET_AUTO_LINK_LOCAL_ONLY=1
+
+# BMC USB-to-USB links for AMI MegaRAC and OpenBMC
+usb:v1D6Bp0103*
+usb:v0525pA4A2*
+usb:v046BpFFB0*
+ ID_NET_AUTO_LINK_LOCAL_ONLY=1

hwdb.d/meson.build

@@ -38,7 +38,8 @@ hwdb_files_test = files(
         '70-software-radio.hwdb',
         '70-sound-card.hwdb',
         '70-touchpad.hwdb',
-        '80-ieee1394-unit-function.hwdb')
+        '80-ieee1394-unit-function.hwdb',
+        '82-net-auto-link-local.hwdb')
 
 if conf.get('ENABLE_HWDB') == 1
         auto_suspend_rules = custom_target(

hwdb.d/parse_hwdb.py

@@ -180,6 +180,7 @@ def property_grammar():
              ('ID_HARDWARE_WALLET', Or((Literal('0'), Literal('1')))),
              ('ID_SOFTWARE_RADIO', Or((Literal('0'), Literal('1')))),
              ('ID_MM_DEVICE_IGNORE', Or((Literal('0'), Literal('1')))),
+             ('ID_NET_AUTO_LINK_LOCAL_ONLY', Or((Literal('0'), Literal('1')))),
              ('POINTINGSTICK_SENSITIVITY', INTEGER),
              ('ID_INPUT_JOYSTICK_INTEGRATION', Or(('internal', 'external'))),
              ('ID_INPUT_TOUCHPAD_INTEGRATION', Or(('internal', 'external'))),

rules.d/meson.build

@@ -33,6 +33,7 @@ rules = [
                '80-net-setup-link.rules',
                '81-net-bridge.rules',
                '81-net-dhcp.rules',
+               '82-net-auto-link-local.rules',
                '90-image-dissect.rules',
                '90-iocost.rules',
               )],