ovpn-dco: switch to the new source

The ovpn kernel module is is part of the Linux kernel starting from
version 6.16.
Switch to the new officially maintained backports source:
https://github.com/OpenVPN/ovpn-backports

Signed-off-by: Qingfang Deng <dqfext@gmail.com>

Author: LGA1150

kernel/ovpn-dco/Makefile

@@ -9,32 +9,39 @@ include $(TOPDIR)/rules.mk
 include $(INCLUDE_DIR)/kernel.mk
 
 PKG_NAME:=ovpn-dco
-PKG_VERSION:=0.2.20250801
+PKG_VERSION:=2025071800
+PKG_VERSION_PREFIX:=net-6.16.0-rc6
+PKG_VERSION_FULL:=$(PKG_VERSION_PREFIX)-$(PKG_VERSION)
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
-PKG_SOURCE_URL= \
-	https://build.openvpn.net/downloads/releases \
-	https://codeload.github.com/OpenVPN/ovpn-dco/tar.gz/v$(PKG_VERSION)?
-PKG_HASH:=542677e69266e99babb560408b61705ef38a7c469eb820a81f609171faa61b20
+PKG_SOURCE_URL=https://codeload.github.com/OpenVPN/ovpn-backports/tar.gz/ovpn-net-next/$(PKG_VERSION_FULL)?
+PKG_HASH:=8b893dd093a5549b34f8375e594024a0d4e2ab5f833c955e7aec1077c1ece754
+PKG_BUILD_DIR:=$(KERNEL_BUILD_DIR)/ovpn-backports-ovpn-net-next-$(PKG_VERSION_FULL)
+PKG_BUILD_PARALLEL:=1
 
 PKG_MAINTAINER:=Jianhui Zhao <zhaojh329@gmail.com>
 PKG_LICENSE:=GPL-2.0-only
 
 
 include $(INCLUDE_DIR)/package.mk
 
-define KernelPackage/ovpn-dco-v2
+define KernelPackage/ovpn
   SUBMENU:=Network Support
   TITLE:=OpenVPN data channel offload
   DEPENDS:= \
 	+kmod-udptunnel4 +IPV6:kmod-udptunnel6 \
 	+kmod-crypto-chacha20poly1305 +kmod-crypto-lib-chacha20 +kmod-crypto-lib-poly1305
-  FILES:=$(PKG_BUILD_DIR)/drivers/net/ovpn-dco/ovpn-dco-v2.ko
-  AUTOLOAD:=$(call AutoLoad,30,ovpn-dco-v2)
+  # Note: TCP requires STREAM_PARSER but it can't be selected by out-of-tree
+  # modules, so pull in AF_KCM for now. This needs to be patched on kernel
+  # side.
+  #KCONFIG:=CONFIG_STREAM_PARSER=y
+  KCONFIG:=CONFIG_AF_KCM
+  FILES:=$(PKG_BUILD_DIR)/drivers/net/ovpn/ovpn.ko
+  AUTOLOAD:=$(call AutoLoad,30,ovpn)
 endef
 
-define KernelPackage/ovpn-dco-v2/description
+define KernelPackage/ovpn/description
   This module enhances the performance of the OpenVPN userspace software
   by offloading the data channel processing to kernelspace.
 endef
@@ -46,20 +53,19 @@ NOSTDINC_FLAGS += \
 	-include $(PKG_BUILD_DIR)/linux-compat.h
 
 EXTRA_KCONFIG:= \
-	CONFIG_OVPN_DCO_V2=m
+	CONFIG_OVPN=m
 
-PKG_EXTMOD_SUBDIRS = drivers/net/ovpn-dco
+PKG_EXTMOD_SUBDIRS = drivers/net/ovpn
 
 MAKE_OPTS:= \
-	$(KERNEL_MAKE_FLAGS) \
-	M="$(PKG_BUILD_DIR)/drivers/net/ovpn-dco" \
+	M="$(PKG_BUILD_DIR)/$(PKG_EXTMOD_SUBDIRS)" \
 	NOSTDINC_FLAGS="$(NOSTDINC_FLAGS)" \
 	$(EXTRA_KCONFIG)
 
 define Build/Compile
-	$(MAKE) -C "$(LINUX_DIR)" \
+	+$(KERNEL_MAKE) $(PKG_JOBS) \
 		$(MAKE_OPTS) \
 		modules
 endef
 
-$(eval $(call KernelPackage,ovpn-dco-v2))
+$(eval $(call KernelPackage,ovpn))