ovpn-dco: Add package

Signed-off-by: Jianhui Zhao <zhaojh329@gmail.com>

kernel/ovpn-dco/Makefile

@@ -0,0 +1,60 @@
+#
+# Copyright (C) 2021 Jianhui Zhao <zhaojh329@gmail.com>
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/kernel.mk
+
+PKG_NAME:=ovpn-dco
+PKG_SOURCE_DATE:=2021-10-05
+PKG_RELEASE:=$(AUTORELEASE)
+
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_URL=https://github.com/OpenVPN/ovpn-dco.git
+PKG_SOURCE_VERSION:=1017d4ada58a4c73f44ef671b6469ae168b6c6b0
+PKG_MIRROR_HASH:=5938ca14c7b3235b60da227f43638556272dea325ddb658bce5e0dadaebb923e
+
+PKG_MAINTAINER:=Jianhui Zhao <zhaojh329@gmail.com>
+PKG_LICENSE:=GPL-2.0-only
+
+
+include $(INCLUDE_DIR)/package.mk
+
+define KernelPackage/ovpn-dco
+  SUBMENU:=Network Support
+  TITLE:=OpenVPN data channel offload
+  DEPENDS:=+kmod-crypto-aead +kmod-udptunnel4 +kmod-udptunnel6
+  FILES:=$(PKG_BUILD_DIR)/drivers/net/ovpn-dco/ovpn-dco.ko
+  AUTOLOAD:=$(call AutoLoad,30,ovpn-dco)
+endef
+
+define KernelPackage/ovpn-dco/description
+  This module enhances the performance of the OpenVPN userspace software
+  by offloading the data channel processing to kernelspace.
+endef
+
+NOSTDINC_FLAGS += \
+	-I$(PKG_BUILD_DIR)/include \
+	-include $(PKG_BUILD_DIR)/linux-compat.h
+
+EXTRA_KCONFIG:= \
+	CONFIG_OVPN_DCO=m
+
+PKG_EXTMOD_SUBDIRS = drivers/net/ovpn-dco
+
+MAKE_OPTS:= \
+	$(KERNEL_MAKE_FLAGS) \
+	M="$(PKG_BUILD_DIR)/drivers/net/ovpn-dco" \
+	NOSTDINC_FLAGS="$(NOSTDINC_FLAGS)" \
+	$(EXTRA_KCONFIG)
+
+define Build/Compile
+	$(MAKE) -C "$(LINUX_DIR)" \
+		$(MAKE_OPTS) \
+		modules
+endef
+
+$(eval $(call KernelPackage,ovpn-dco))