From 9a33f64257c29c36843b2e4fb4fe14328c340f8f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vin=C3=ADcius=20Ferr=C3=A3o?=
 <2031761+viniciusferrao@users.noreply.github.com>
Date: Thu, 23 Jul 2026 19:19:23 -0300
Subject: [PATCH] fix(genesis): find the boot NIC over InfiniBand (IPoIB)

When a node boots from an InfiniBand interface, doxcat could not match BOOTIF
to the netdev, so boot-nic detection failed. Load ib_ipoib and, if the normal
Ethernet lookup finds nothing, fall back to matching the InfiniBand device by
its (shorter) IPoIB address.

modprobe ib_ipoib is harmless where there is no IB hardware (the module simply
loads no devices), and the IB lookup only runs when the Ethernet lookup fails,
so non-IB nodes are unaffected.

Not lab-validated (no InfiniBand fabric available; the SR635's Mellanox card is
in Ethernet mode).

Recovered from the unmerged lenovobuild branch (aeeebd5f).

Co-authored-by: Jarrod Johnson <10814490+jjohnson42@users.noreply.github.com>
---
 xCAT-genesis-scripts/usr/bin/doxcat | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/xCAT-genesis-scripts/usr/bin/doxcat b/xCAT-genesis-scripts/usr/bin/doxcat
index 0bf5e360a..40a2722b2 100755
--- a/xCAT-genesis-scripts/usr/bin/doxcat
+++ b/xCAT-genesis-scripts/usr/bin/doxcat
@@ -32,6 +32,7 @@ logger -s -t $log_label -p local4.info "Beginning doxcat process..."
 
 modprobe acpi_cpufreq 2>/dev/null		# on some machines this fails
 modprobe cpufreq_ondemand
+modprobe ib_ipoib
 if ls /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor &>/dev/null; then
     if grep -q ondemand /sys/devices/system/cpu/cpu*/cpufreq/scaling_available_governors; then
         for gov in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do
@@ -41,10 +42,14 @@ if ls /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor &>/dev/null; then
 fi
 if [ ! -z "$BOOTIF" ]; then
 	BOOTIF=`echo $BOOTIF|sed -e s/01-// -e s/-/:/g`
+	IBOOTIF=`echo $BOOTIF|sed -e s/^..//`
 	logger -s -t $log_label -p local4.info "Waiting for device with address $BOOTIF to appear.."
 	gripeiter=6000
 	while [ -z "$bootnic" ]; do
 		bootnic=`ip link show|grep -B1 $BOOTIF|grep mtu|awk '{print $2}'|sed -e 's/:$//'`
+		if [ -z "$bootnic" ]; then
+			bootnic=`ip link show|grep -B1 infiniband|grep -B1 $IBOOTIF|grep mtu|awk '{print $2}'|sed -e 's/:$//'`
+		fi
 		sleep 0.1
 		if [ $gripeiter = 0 ]; then
 			logger -s -t $log_label -p local4.err "Unable to find boot device (Maybe the xCAT genesis kernel is missing the driver for your NIC?)"