nes-proj/cpu/native/net/tapdev6.c
Robert Quattlebaum 092b6f3baa platform/minimal-net: Implement better idle behavior.
The minimal-net target, as currently written, wakes up the
CPU every millisecond to check for packets, and will only
react in real-time to input from stdin. If you are running
this on a laptop battery, your battery will quickly drain.

This change allows the CPU to idle when there is literally
nothing to do while still being responsive to input from
stein and/or incoming packets. This fix should significantly
improve performance while significantly improving power
usage. Win-win.

Also added `_xassert()` implementation so that the contiki-
provided `assert()` macro will work properly when used
on this platform.
2013-01-30 09:17:29 -08:00

241 lines
6.1 KiB
C

/*
* Copyright (c) 2001, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Author: Adam Dunkels <adam@sics.se>
*
*/
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/socket.h>
#ifdef linux
#include <sys/ioctl.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#define DEVTAP "/dev/net/tun"
#else /* linux */
#define DEVTAP "/dev/tap0"
#endif /* linux */
#include "tapdev6.h"
#include "contiki-net.h"
#define DROP 0
#if DROP
static int drop = 0;
#endif
static int fd;
static unsigned long lasttime;
#define BUF ((struct uip_eth_hdr *)&uip_buf[0])
#define IPBUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
#define DEBUG 0
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#define PRINT6ADDR(addr) PRINTF("%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x", ((uint8_t *)addr)[0], ((uint8_t *)addr)[1], ((uint8_t *)addr)[2], ((uint8_t *)addr)[3], ((uint8_t *)addr)[4], ((uint8_t *)addr)[5], ((uint8_t *)addr)[6], ((uint8_t *)addr)[7], ((uint8_t *)addr)[8], ((uint8_t *)addr)[9], ((uint8_t *)addr)[10], ((uint8_t *)addr)[11], ((uint8_t *)addr)[12], ((uint8_t *)addr)[13], ((uint8_t *)addr)[14], ((uint8_t *)addr)[15])
#else
#define PRINTF(...)
#define PRINT6ADDR(addr)
#endif
static void do_send(void);
uint8_t tapdev_send(uip_lladdr_t *lladdr);
/*---------------------------------------------------------------------------*/
int
tapdev_fd(void)
{
return fd;
}
uint16_t
tapdev_poll(void)
{
fd_set fdset;
struct timeval tv;
int ret;
tv.tv_sec = 0;
tv.tv_usec = 0;
FD_ZERO(&fdset);
if(fd > 0) {
FD_SET(fd, &fdset);
}
ret = select(fd + 1, &fdset, NULL, NULL, &tv);
if(ret == 0) {
return 0;
}
ret = read(fd, uip_buf, UIP_BUFSIZE);
PRINTF("tapdev6: read %d bytes (max %d)\n", ret, UIP_BUFSIZE);
if(ret == -1) {
perror("tapdev_poll: read");
}
return ret;
}
/*---------------------------------------------------------------------------*/
void
tapdev_init(void)
{
char buf[1024];
fd = open(DEVTAP, O_RDWR);
if(fd == -1) {
perror("tapdev: tapdev_init: open");
return;
}
#ifdef linux
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP|IFF_NO_PI;
if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0) {
perror(buf);
exit(1);
}
}
#endif /* Linux */
/* Linux (ubuntu)
snprintf(buf, sizeof(buf), "ip link set tap0 up");
system(buf);
PRINTF("%s\n", buf);
snprintf(buf, sizeof(buf), "ip -6 address add fc00::231/7 dev tap0");
system(buf);
PRINTF("%s\n", buf);
snprintf(buf, sizeof(buf), "ip -6 route add fc00::0/7 dev tap0");
system(buf);
PRINTF("%s\n", buf);
*/
/* freebsd */
snprintf(buf, sizeof(buf), "ifconfig tap0 up");
system(buf);
printf("%s\n", buf);
/* */
lasttime = 0;
/* gdk_input_add(fd, GDK_INPUT_READ,
read_callback, NULL);*/
atexit(&tapdev_exit);
}
/*---------------------------------------------------------------------------*/
static void
do_send(void)
{
int ret;
if(fd <= 0) {
return;
}
PRINTF("tapdev_send: sending %d bytes\n", uip_len);
/* check_checksum(uip_buf, size);*/
#if DROP
drop++;
if(drop % 8 == 7) {
PRINTF("Dropped an output packet!\n");
return;
}
#endif /* DROP */
ret = write(fd, uip_buf, uip_len);
if(ret == -1) {
perror("tap_dev: tapdev_send: writev");
exit(1);
}
}
/*---------------------------------------------------------------------------*/
uint8_t tapdev_send(uip_lladdr_t *lladdr)
{
/*
* If L3 dest is multicast, build L2 multicast address
* as per RFC 2464 section 7
* else fill with th eaddrsess in argument
*/
if(lladdr == NULL) {
/* the dest must be multicast */
(&BUF->dest)->addr[0] = 0x33;
(&BUF->dest)->addr[1] = 0x33;
(&BUF->dest)->addr[2] = IPBUF->destipaddr.u8[12];
(&BUF->dest)->addr[3] = IPBUF->destipaddr.u8[13];
(&BUF->dest)->addr[4] = IPBUF->destipaddr.u8[14];
(&BUF->dest)->addr[5] = IPBUF->destipaddr.u8[15];
} else {
memcpy(&BUF->dest, lladdr, UIP_LLADDR_LEN);
}
memcpy(&BUF->src, &uip_lladdr, UIP_LLADDR_LEN);
BUF->type = UIP_HTONS(UIP_ETHTYPE_IPV6); //math tmp
uip_len += sizeof(struct uip_eth_hdr);
do_send();
return 0;
}
/*---------------------------------------------------------------------------*/
void
tapdev_do_send(void)
{
do_send();
}
/*---------------------------------------------------------------------------*/
// math added function
void
tapdev_exit(void)
{
}
/*---------------------------------------------------------------------------*/