147 lines
3.2 KiB
C
147 lines
3.2 KiB
C
/* net_driver_ethernet.c - Ethernet driver */
|
|
|
|
/*
|
|
* Copyright (c) 2015 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 <nanokernel.h>
|
|
#include <toolchain.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <stdbool.h>
|
|
|
|
#if defined(CONFIG_STDOUT_CONSOLE)
|
|
#include <stdio.h>
|
|
#define PRINT printf
|
|
#else
|
|
#include <misc/printk.h>
|
|
#define PRINT printk
|
|
#endif
|
|
|
|
#include <net/net_core.h>
|
|
#include "net_driver_ethernet.h"
|
|
|
|
#include "contiki/ipv4/uip_arp.h"
|
|
|
|
static bool opened;
|
|
|
|
static ethernet_tx_callback tx_cb;
|
|
|
|
void net_driver_ethernet_register_tx(ethernet_tx_callback cb)
|
|
{
|
|
tx_cb = cb;
|
|
}
|
|
|
|
static int net_driver_ethernet_open(void)
|
|
{
|
|
NET_DBG("Initialized Ethernet driver\n");
|
|
|
|
opened = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool net_driver_ethernet_is_opened(void)
|
|
{
|
|
return opened;
|
|
}
|
|
|
|
static int net_driver_ethernet_send(struct net_buf *buf)
|
|
{
|
|
#ifdef CONFIG_NETWORKING_WITH_IPV6
|
|
struct uip_eth_hdr *eth_hdr = (struct uip_eth_hdr *)uip_buf(buf);
|
|
#endif
|
|
int res;
|
|
|
|
NET_DBG("Sending %d bytes\n", buf->len);
|
|
|
|
if (!tx_cb) {
|
|
NET_ERR("Ethernet transmit callback is uninitialized.\n");
|
|
return -1;
|
|
}
|
|
|
|
#ifdef CONFIG_NETWORKING_WITH_IPV4
|
|
/* Note that uip_arp_out overwrites the outgoing packet if it needs to
|
|
* send an ARP request. It relies on higher layers to resend the
|
|
* original packet if necessary.
|
|
*/
|
|
uip_arp_out(buf);
|
|
#else
|
|
memcpy(eth_hdr->dest.addr, ip_buf_ll_dest(buf).u8, UIP_LLADDR_LEN);
|
|
memcpy(eth_hdr->src.addr, uip_lladdr.addr, UIP_LLADDR_LEN);
|
|
#endif
|
|
|
|
res = tx_cb(buf);
|
|
if (res == 1) {
|
|
/* Release the buffer because we sent all the data
|
|
* successfully.
|
|
*/
|
|
ip_buf_unref(buf);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
void net_driver_ethernet_recv(struct net_buf *buf)
|
|
{
|
|
#ifdef CONFIG_NETWORKING_WITH_IPV4
|
|
struct uip_eth_hdr *eth_hdr = (struct uip_eth_hdr *)uip_buf(buf);
|
|
|
|
if (eth_hdr->type == uip_htons(UIP_ETHTYPE_ARP)) {
|
|
uip_arp_arpin(buf);
|
|
|
|
/* If uip_arp_arpin needs to send an ARP response, it
|
|
* overwrites the contents of buf and updates its
|
|
* length variable. Otherwise, it zeroes out the
|
|
* length variable.
|
|
*/
|
|
if (uip_len(buf) == 0) {
|
|
ip_buf_unref(buf);
|
|
return;
|
|
}
|
|
|
|
if (!tx_cb) {
|
|
NET_ERR("Ethernet transmit callback is uninitialized.\n");
|
|
ip_buf_unref(buf);
|
|
return;
|
|
}
|
|
|
|
if (tx_cb(buf) != 1) {
|
|
NET_ERR("Failed to send ARP response.\n");
|
|
}
|
|
|
|
ip_buf_unref(buf);
|
|
} else
|
|
#endif
|
|
|
|
if (net_recv(buf) != 0) {
|
|
NET_ERR("Unexpected return value from net_recv.\n");
|
|
ip_buf_unref(buf);
|
|
}
|
|
}
|
|
|
|
static struct net_driver net_driver_ethernet = {
|
|
.head_reserve = 0,
|
|
.open = net_driver_ethernet_open,
|
|
.send = net_driver_ethernet_send,
|
|
};
|
|
|
|
int net_driver_ethernet_init(void)
|
|
{
|
|
net_register_driver(&net_driver_ethernet);
|
|
|
|
return 0;
|
|
}
|