fw/ethernet.c (2a4b80d) - mips_sys · BlinkenArea

ethernet.c

/* flpDistriR25S - flexipix distributor for pixels round 25mm with switch
 * version 1.0.0 date 2011-06-12
 * created by Stefan Schuermans <stefan@schuermans.info>
 * Copyright (C) 2006-2011 flexipix GbR, Germany
 */

#include "arp.h"
#include "config.h"
#include "eth.h"
#include "ethernet.h"
#include "ip.h"
#include "macros.h"
#include "nethelp.h"

/**
 * @brief process a received ethernet packet
 * @param[in] ptr pointer to data of packet
 * @param[in] sz size of packet
 */
void ethernet_recv(void *ptr, unsigned int sz)
{
  struct ethernet_packet *eth_pack;

// packet too short
  if (sz < sizeof(struct ethernet_packet))
    return;

eth_pack = ptr;

// branch according to packet type
  switch (eth_pack->eth_hdr.type)
  {
    // ARP
    case htons(0x0806):
      arp_recv(ptr, sz);
      break;
    // IP
    case htons(0x0800):
      ip_recv(ptr, sz);
      break;
  }
}

/**
 * @brief send an ethernet packet
 * @param[in] ptr pointer to data of packet
 * @param[in] sz size of packet
 *
 * ptr must point to a ethernet_packet
 * with eth_hdr.dest and eth_hdr.type already initialized
 */
void ethernet_send(void *ptr, unsigned int sz)
{
  struct ethernet_packet *eth_pack;

// packet too short
  if (sz < sizeof(struct ethernet_packet))
    return;

eth_pack = ptr;

// fill in source address
  mac_cpy(eth_pack->eth_hdr.src, config_mac.mac);

// transmit packet
  eth_tx(ptr, sz);
}

mips_sys

handle padding to minimum ethernet frame size (TX) in HW