From 523d81ebd560fd97cd239d10c9d749c79b6e158c 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

r8126 driver build is disabled on K6.10 and later. This is
causing the packaging failure where module is not available.

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

Bug 4478230

Change-Id: I6ceef7f92863499c58edaf4ddd19ae65b12a2a00
Signed-off-by: Revanth Kumar Uppala <ruppala@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3158781
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
---
 drivers/net/ethernet/realtek/r8126/Makefile      | 11 +++++++++++
 drivers/net/ethernet/realtek/r8126/r8126_dummy.c | 16 ++++++++++++++++
 2 files changed, 27 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 56dc0152..7038f251 100644
--- a/drivers/net/ethernet/realtek/r8126/Makefile
+++ b/drivers/net/ethernet/realtek/r8126/Makefile
@@ -30,6 +30,15 @@
 #  US6,570,884, US6,115,776, and US6,327,625.
 ################################################################################
 
+LINUX_VERSION := $(shell expr $(VERSION) \* 256 + $(PATCHLEVEL))
+LINUX_VERSION_6_9 := $(shell expr 6 \* 256 + 9)
+
+# Use dummy R8126 driver for Kernel versions greater that K69
+ifeq ($(shell test $(LINUX_VERSION) -gt $(LINUX_VERSION_6_9); echo $$?),0)
+obj-m := r8126.o
+r8126-objs := r8126_dummy.o
+else
+
 CONFIG_SOC_LAN = n
 ENABLE_REALWOW_SUPPORT = n
 ENABLE_DASH_SUPPORT = n
@@ -130,3 +139,5 @@ endif
 ifeq ($(ENABLE_RX_PACKET_FRAGMENT), y)
 	EXTRA_CFLAGS += -DENABLE_RX_PACKET_FRAGMENT
 endif
+
+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..bf28c49c
--- /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) 2024 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");
+