Fix for IB diskless boot to install clone

The infiniband section must be defined for the OS
to use the IB link. If it is missing then networking
does not come up during firstboot.

Fix this by having an inifiniband section including explicitly
declaring use of datagram mode. This should suffice for all
install use cases, and may be changed after firstboot starts.

confluent_osdeploy/el9-diskless/initramfs/usr/lib/dracut/hooks/cmdline/10-confluentdiskless.sh

@@ -171,6 +171,13 @@ permissions=
 wait-device-timeout=60000
 
 EOC
+if [ "$linktype" = infiniband ]; then
+cat >> /run/NetworkManager/system-connections/$ifname.nmconnection << EOC
+[infiniband]
+transport-mode=datagram
+
+EOC
+fi
 autoconfigmethod=$(grep ^ipv4_method: /etc/confluent/confluent.deploycfg |awk '{print $2}')
 auto6configmethod=$(grep ^ipv6_method: /etc/confluent/confluent.deploycfg |awk '{print $2}')
 if [ "$autoconfigmethod" = "dhcp" ]; then