osd-contiki/cpu/native/net/tapdev-drv.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

110 lines
3.3 KiB
C

/*
* Copyright (c) 2005, 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.
*
* This file is part of the Contiki operating system.
*
*/
#include "contiki-net.h"
#if UIP_CONF_IPV6
#include "tapdev6.h"
#else
#include "tapdev.h"
#endif /* UIP_CONF_IPV6 */
#include "tapdev-drv.h"
#define BUF ((struct uip_eth_hdr *)&uip_buf[0])
#define IPBUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
PROCESS(tapdev_process, "TAP driver");
/*---------------------------------------------------------------------------*/
#if !UIP_CONF_IPV6
uint8_t
tapdev_output(void)
{
uip_arp_out();
tapdev_send();
return 0;
}
#endif
/*---------------------------------------------------------------------------*/
static void
pollhandler(void)
{
uip_len = tapdev_poll();
if(uip_len > 0) {
#if UIP_CONF_IPV6
if(BUF->type == uip_htons(UIP_ETHTYPE_IPV6)) {
tcpip_input();
} else
#endif /* UIP_CONF_IPV6 */
if(BUF->type == uip_htons(UIP_ETHTYPE_IP)) {
uip_len -= sizeof(struct uip_eth_hdr);
tcpip_input();
} else if(BUF->type == uip_htons(UIP_ETHTYPE_ARP)) {
#if !UIP_CONF_IPV6 //math
uip_arp_arpin();
/* If the above function invocation resulted in data that
should be sent out on the network, the global variable
uip_len is set to a value > 0. */
if(uip_len > 0) {
tapdev_send();
}
#endif
} else {
uip_len = 0;
}
}
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(tapdev_process, ev, data)
{
PROCESS_POLLHANDLER(pollhandler());
PROCESS_BEGIN();
tapdev_init();
#if !UIP_CONF_IPV6
tcpip_set_outputfunc(tapdev_output);
#else
tcpip_set_outputfunc(tapdev_send);
#endif
process_poll(&tapdev_process);
PROCESS_WAIT_UNTIL(ev == PROCESS_EVENT_EXIT);
tapdev_exit();
PROCESS_END();
}
/*---------------------------------------------------------------------------*/