[openwrt/openwrt] kernel: modules: add Mellanox Spectrum hotplug renaming script

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/8edcd772db0086898b09d73d359bdc9d96b241ba

commit 8edcd772db0086898b09d73d359bdc9d96b241ba
Author: Til Kaiser <mail at tk154.de>
AuthorDate: Mon Dec 16 19:26:20 2024 +0100

    kernel: modules: add Mellanox Spectrum hotplug renaming script
    
    Currently, the interfaces of the Mellanox Spectrum Switch QSFP ports
    are all labeled eth*. Their order doesn't match the faceplate and is
    different for each model.
    
    They could be named during boot, but this isn't sufficient because they
    support port splitting. After such ports are split, their port naming
    begins again with eth*, and the same is true after they are unsplit again.
    
    A hotplug script is used here that reads from the sysfs file
    phys_port_name, which contains p1, p2, p3, ... for unsplit ports
    and p1s0, p1s1, p1s2 for split ports.
    
    Signed-off-by: Til Kaiser <mail at tk154.de>
    Link: https://github.com/openwrt/openwrt/pull/17251
    Signed-off-by: Robert Marko <robimarko at gmail.com>
---
 .../kernel/linux/files/hotplug-mlxsw-spectrum-port-names.sh    | 10 ++++++++++
 package/kernel/linux/modules/netdevices.mk                     |  7 +++++++
 2 files changed, 17 insertions(+)

diff --git a/package/kernel/linux/files/hotplug-mlxsw-spectrum-port-names.sh b/package/kernel/linux/files/hotplug-mlxsw-spectrum-port-names.sh
new file mode 100644
index 0000000000..7637725f67
--- /dev/null
+++ b/package/kernel/linux/files/hotplug-mlxsw-spectrum-port-names.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+if [ "$ACTION" = "add" ]; then
+	read -r board_name < "/tmp/sysinfo/board_name"
+
+	if [[ "$board_name" = "mellanox-technologies-ltd-msn*" ]]; then
+		read -r port_name < "/sys/class/net/$DEVICENAME/phys_port_name"
+		[ -n "$port_name" ] && ip link set "$DEVICENAME" name "sw$port_name"
+	fi
+fi
diff --git a/package/kernel/linux/modules/netdevices.mk b/package/kernel/linux/modules/netdevices.mk
index 0aed1655a9..522e76d180 100644
--- a/package/kernel/linux/modules/netdevices.mk
+++ b/package/kernel/linux/modules/netdevices.mk
@@ -1972,6 +1972,13 @@ define KernelPackage/mlxsw-spectrum/description
   Spectrum/Spectrum-2/Spectrum-3/Spectrum-4 Ethernet Switch ASICs.
 endef
 
+define KernelPackage/mlxsw-spectrum/install
+	$(INSTALL_DIR) $(1)/etc/hotplug.d/net
+	$(INSTALL_DATA) \
+		./files/hotplug-mlxsw-spectrum-port-names.sh \
+		$(1)/etc/hotplug.d/net/10-mlxsw-spectrum-port-names
+endef
+
 $(eval $(call KernelPackage,mlxsw-spectrum))