From 009a4a8f5d28f99984d68ab16cbc5cdba28c86b9 Mon Sep 17 00:00:00 2001
From: Revanth Kumar Uppala <ruppala@nvidia.com>
Date: Thu, 6 Jun 2024 06:50:11 +0000
Subject: [PATCH] ethernet: Add dummy driver for r8126

Add dummy driver when real driver is not available to make
packaging success.

Bug 5312842

Change-Id: I9f0e531f0b9d3353c6f98a3872a4c0dd5cb27934
Signed-off-by: Revanth Kumar Uppala <ruppala@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3415213
Reviewed-by: Ashutosh Jha <ajha@nvidia.com>
Reviewed-by: Shobek Attupurath <sattupurath@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
---
 drivers/net/ethernet/realtek/r8126/Makefile      | 15 +++++++++++++++
 drivers/net/ethernet/realtek/r8126/r8126_dummy.c | 16 ++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 drivers/net/ethernet/realtek/r8126/r8126_dummy.c

diff --git a/drivers/net/ethernet/realtek/r8126/Makefile b/drivers/net/ethernet/realtek/r8126/Makefile
index 657a6bc6..8cae8634 100644
--- a/drivers/net/ethernet/realtek/r8126/Makefile
+++ b/drivers/net/ethernet/realtek/r8126/Makefile
@@ -30,6 +30,19 @@
 #  US6,570,884, US6,115,776, and US6,327,625.
 ################################################################################
 
+LINUX_VERSION := $(shell expr $(VERSION) \* 256 + $(PATCHLEVEL))
+LINUX_VERSION_6_16 := $(shell expr 6 \* 256 + 16)
+LINUX_VERSION_5_14 := $(shell expr 5 \* 256 + 14)
+
+# Use dummy R8126 driver for Kernel versions greater that K6.16
+ifeq ($(shell test $(LINUX_VERSION) -gt $(LINUX_VERSION_6_16); echo $$?),0)
+obj-m := r8126.o
+r8126-objs := r8126_dummy.o
+else ifeq ($(shell test $(LINUX_VERSION) -eq $(LINUX_VERSION_5_14); echo $$?),0)
+obj-m := r8126.o
+r8126-objs := r8126_dummy.o
+else
+
 CONFIG_SOC_LAN = y
 ENABLE_FIBER_SUPPORT = n
 ENABLE_REALWOW_SUPPORT = n
@@ -136,3 +149,5 @@ endif
 
 # Backward compatibility
 ccflags-y  += $(EXTRA_CFLAGS)
+
+endif
diff --git a/drivers/net/ethernet/realtek/r8126/r8126_dummy.c b/drivers/net/ethernet/realtek/r8126/r8126_dummy.c
new file mode 100644
index 00000000..448b8b97
--- /dev/null
+++ b/drivers/net/ethernet/realtek/r8126/r8126_dummy.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+#include <linux/module.h>
+
+/* Dummy implementation for module */
+static int __init r8126_dummy_dummy_init(void)
+{
+	return 0;
+}
+device_initcall(r8126_dummy_dummy_init);
+
+MODULE_AUTHOR("Revanth Kumar Uppala <ruppala@nvidia.com>");
+MODULE_DESCRIPTION("Dummy R8126 dummy driver");
+MODULE_LICENSE("GPL");
+