From 36b50b7f27884add468a86ef7147977e66a9fd91 Mon Sep 17 00:00:00 2001
From: Revanth Kumar Uppala <ruppala@nvidia.com>
Date: Fri, 24 May 2024 10:04:34 +0000
Subject: [PATCH] ethernet: Add dummy driver for r8126

r8126 driver build is disabled on K6.9 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: I1b83fe1c3f30a9f825631650ca2520d720ef07c6
Signed-off-by: Revanth Kumar Uppala <ruppala@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3144344
(cherry picked from commit 4c39ed9cb53bf88a12855fd8c65700df906aa31c)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3158779
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
---
 drivers/net/ethernet/realtek/Makefile            |  1 +
 drivers/net/ethernet/realtek/r8126/Makefile      | 10 ++++++++++
 drivers/net/ethernet/realtek/r8126/r8126_dummy.c | 15 +++++++++++++++
 3 files changed, 26 insertions(+)
 create mode 100644 drivers/net/ethernet/realtek/r8126/r8126_dummy.c

diff --git a/drivers/net/ethernet/realtek/Makefile b/drivers/net/ethernet/realtek/Makefile
index a5c19b39..6339a8cb 100644
--- a/drivers/net/ethernet/realtek/Makefile
+++ b/drivers/net/ethernet/realtek/Makefile
@@ -2,4 +2,5 @@
 # Copyright (c) 2024, NVIDIA CORPORATION.  All rights reserved.
 
 obj-m += r8168/
+obj-m += r8126/
 
diff --git a/drivers/net/ethernet/realtek/r8126/Makefile b/drivers/net/ethernet/realtek/r8126/Makefile
index fb3d9301..8d0c5372 100644
--- a/drivers/net/ethernet/realtek/r8126/Makefile
+++ b/drivers/net/ethernet/realtek/r8126/Makefile
@@ -29,6 +29,14 @@
 #  This product is covered by one or more of the following patents:
 #  US6,570,884, US6,115,776, and US6,327,625.
 ################################################################################
+LINUX_VERSION := $(shell expr $(VERSION) \* 256 + $(PATCHLEVEL))
+LINUX_VERSION_6_9 := $(shell expr 6 \* 256 + 9)
+
+# Use dummy R8126 driver for K69 and later
+ifeq ($(shell test $(LINUX_VERSION) -ge $(LINUX_VERSION_6_9); echo $$?),0)
+obj-m := r8126.o
+r8126-objs := r8126_dummy.o
+else
 
 CONFIG_SOC_LAN = n
 ENABLE_REALWOW_SUPPORT = n
@@ -131,3 +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..62469714
--- /dev/null
+++ b/drivers/net/ethernet/realtek/r8126/r8126_dummy.c
@@ -0,0 +1,15 @@
+// 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("Laxman Dewangan <ldewangan@nvidia.com>");
+MODULE_DESCRIPTION("Dummy R8126 dummy driver");
+MODULE_LICENSE("GPL");