net: l2: Add symbols for custom IEEE802154 L2

Define a custom IEEE802154 based L2. The user can then use those symbols
to implement their own 802.15.4 based L2, based on those symbols, w/o a
need to modify the Zephyr tree.

Signed-off-by: Robert Lubos <[email protected]>

Author: rlubos

drivers/ieee802154/ieee802154_nrf5.c

@@ -1080,9 +1080,13 @@ static struct ieee802154_radio_api nrf5_radio_api = {
 #define L2 OPENTHREAD_L2
 #define L2_CTX_TYPE NET_L2_GET_CTX_TYPE(OPENTHREAD_L2)
 #define MTU 1280
+#elif defined(CONFIG_NET_L2_CUSTOM_IEEE802154)
+#define L2 CUSTOM_IEEE802154_L2
+#define L2_CTX_TYPE NET_L2_GET_CTX_TYPE(CUSTOM_IEEE802154_L2)
+#define MTU CONFIG_NET_L2_CUSTOM_IEEE802154_MTU
 #endif
 
-#if defined(CONFIG_NET_L2_IEEE802154) || defined(CONFIG_NET_L2_OPENTHREAD)
+#if defined(CONFIG_NET_L2_PHY_IEEE802154)
 NET_DEVICE_INIT(nrf5_154_radio, CONFIG_IEEE802154_NRF5_DRV_NAME,
 		nrf5_init, NULL, &nrf5_data, &nrf5_radio_cfg,
 		CONFIG_IEEE802154_NRF5_INIT_PRIO,

include/net/net_l2.h

@@ -132,6 +132,14 @@ NET_L2_DECLARE_PUBLIC(CANBUS_RAW_L2);
 NET_L2_DECLARE_PUBLIC(CANBUS_L2);
 #endif /* CONFIG_NET_L2_CANBUS */
 
+#ifdef CONFIG_NET_L2_CUSTOM_IEEE802154
+#ifndef CUSTOM_IEEE802154_L2
+#define CUSTOM_IEEE802154_L2	CUSTOM_IEEE802154
+#endif
+#define CUSTOM_IEEE802154_L2_CTX_TYPE	void*
+NET_L2_DECLARE_PUBLIC(CUSTOM_IEEE802154_L2);
+#endif /* CONFIG_NET_L2_CUSTOM_IEEE802154 */
+
 #define NET_L2_INIT(_name, _recv_fn, _send_fn, _enable_fn, _get_flags_fn) \
 	const STRUCT_SECTION_ITERABLE(net_l2,				\
 				      NET_L2_GET_NAME(_name)) = {	\

subsys/net/l2/Kconfig

@@ -81,6 +81,19 @@ source "subsys/net/l2/ieee802154/Kconfig"
 
 source "subsys/net/l2/openthread/Kconfig"
 
+config NET_L2_CUSTOM_IEEE802154
+	bool "Enable custom IEEE802154 L2"
+	select NET_L2_PHY_IEEE802154
+	help
+	  Enable custom IEEE802154 based L2. Zephyr does not provide
+	  implementation for this L2 - users can implement their own L2 using
+	  this symbols, on top of the IEEE802154 radio driver.
+
+config NET_L2_CUSTOM_IEEE802154_MTU
+	int "MTU for the custom IEEE802154 L2"
+	depends on NET_L2_CUSTOM_IEEE802154
+	default 127
+
 source "subsys/net/l2/canbus/Kconfig"
 
 config NET_L2_WIFI_MGMT