net: Add generic network interface header

This will be used by the new network stack to relate a device to actual
network context, and used in the different layers (mac, ip ...).

Change-Id: I30c08fa975314544c36b71636fd9653d562891b3
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>

include/linker/common-ram.ld

@@ -164,3 +164,11 @@
 		KEEP(*(SORT_BY_NAME("._k_memory_pool*")))
 		_k_mem_pool_end = .;
 	} GROUP_DATA_LINK_IN(RAMABLE_REGION, ROMABLE_REGION)
+
+	SECTION_DATA_PROLOGUE(net_if, (OPTIONAL),)
+	{
+		__net_if_start = .;
+		*(".net_if.*")
+		KEEP(*(SORT_BY_NAME(".net_if*")))
+		__net_if_end = .;
+	} GROUP_DATA_LINK_IN(RAMABLE_REGION, ROMABLE_REGION)

include/net/net_if.h

@@ -14,6 +14,118 @@
  * limitations under the License.
  */
 
-#if defined(CONFIG_NET_UIP)
+/**
-#include <net/uip/net_if.h>
+ * @file
+ * @brief Public API for network interface
+ */
+
+#ifndef __NET_IF_H__
+#define __NET_IF_H__
+
+#include <device.h>
+
+#include <net/net_linkaddr.h>
+
+#ifdef __cplusplus
+extern "C" {
 #endif
+
+/**
+ * @brief Network Interface structure
+ *
+ * Used to handle a network interface on top of a device driver instance.
+ * There can be many net_if instance against the same device.
+ *
+ * Such interface is mainly to be used by the link layer, but is also tight
+ * to a network context: it then makes the relation with a network context
+ * and the network device.
+ *
+ * Because of the strong relationship between a device driver and such
+ * network interface, each net_if should be instanciated by
+ */
+struct net_if {
+	/** The actualy device driver instance the net_if is related to */
+	struct device *dev;
+
+	/** The harware link address */
+	struct net_linkaddr link_addr;
+
+	/** The hardware MTU */
+	uint16_t mtu;
+};
+
+/**
+ * @brief Get an network interface's device
+ * @param iface Pointer to a network interface structure
+ * @return a pointer on the device driver instance
+ */
+static inline struct device *net_if_get_device(struct net_if *iface)
+{
+	return iface->dev;
+}
+
+/**
+ * @brief Get an network interface's link address
+ * @param iface Pointer to a network interface structure
+ * @return a pointer on the network link address
+ */
+static inline struct net_linkaddr *net_if_get_link_addr(struct net_if *iface)
+{
+	return &iface->link_addr;
+}
+
+/**
+ * @brief Set a network interfac's link address
+ * @param iface Pointer to a network interface structure
+ * @param addr a pointer on a uint8_t buffer representing the address
+ * @param len length of the address buffer
+ */
+static inline void net_if_set_link_addr(struct net_if *iface,
+					uint8_t *addr, uint8_t len)
+{
+	iface->link_addr.addr = addr;
+	iface->link_addr.len = len;
+}
+
+/**
+ * @brief Get an network interface's MTU
+ * @param iface Pointer to a network interface structure
+ * @return the MTU
+ */
+static inline uint16_t net_if_get_mtu(struct net_if *iface)
+{
+	return iface->mtu;
+}
+
+struct net_if_api {
+	void (*init)(struct net_if *iface);
+};
+
+#ifdef CONFIG_NET_YAIP
+
+#define NET_IF_INIT(dev_name, sfx, _mtu)				\
+	static struct net_if (__net_if_ ##dev_name _##sfx) __used	\
+	__attribute__((__section__(".net_if.data"))) = {		\
+		.dev = &(__device_##dev_name),				\
+		.mtu = _mtu,						\
+	}
+
+#else
+
+#define NET_IF_INIT(...)
+
+#endif /* CONFIG_NET_YAIP */
+
+/* Network device intialization macro */
+
+#define NET_DEVICE_INIT(dev_name, drv_name, init_fn,		\
+			data, cfg_info, prio, api, mtu)		\
+	DEVICE_AND_API_INIT(dev_name, drv_name, init_fn, data,	\
+			    cfg_info, NANOKERNEL, prio, api);	\
+	NET_IF_INIT(dev_name, 0, mtu)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __NET_IFACE_H__ */

net/yaip/Kconfig

@@ -15,3 +15,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+
+config NET_YAIP_INIT_PRIO
+       int
+       default 99

net/yaip/Makefile

@@ -1,2 +1,2 @@
 ccflags-y += -I${srctree}/net/ip
-obj-y = net_core.o
+obj-y = net_core.o net_if.o

net/yaip/net_if.c

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2016 Intel Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <init.h>
+#include <net/net_if.h>
+
+/* net_if dedicated section limiters */
+extern struct net_if __net_if_start[];
+extern struct net_if __net_if_end[];
+
+static int net_if_init(struct device *unused)
+{
+	struct net_if_api *api;
+	struct net_if *iface;
+
+	ARG_UNUSED(unused);
+
+	for (iface = __net_if_start; iface != __net_if_end; iface++) {
+		api = (struct net_if_api *) iface->dev->driver_api;
+
+		if (api && api->init) {
+			api->init(iface);
+		}
+	}
+
+	return 0;
+}
+
+SYS_INIT(net_if_init, NANOKERNEL, CONFIG_NET_YAIP_INIT_PRIO);