ethernetif.c

freescale k40/k60 freertos-lwip例程

  {
    if( xENETTxDescriptors[ uxNextTxBuffer ].status & TX_BD_R )
    {
      /* Wait for the buffer to become available. */
      vTaskDelay( netifBUFFER_WAIT_DELAY );
    }
    else
    {
      #ifdef NBUF_LITTLE_ENDIAN
      pcTxData = (unsigned char *)__REV((uint32_t)xENETTxDescriptors[ uxNextTxBuffer ].data);
      #else
      pcTxData = xENETTxDescriptors[ uxNextTxBuffer ].data;
      #endif
      break;
    }
  }

  if( pcTxData == NULL ) 
  {
    /* For break point only. */
    portNOP();

    return ERR_BUF;
  }
  else
  {
    for(q = p; q != NULL; q = q->next) 
    {
      /* Send the data from the pbuf to the interface, one pbuf at a
         time. The size of the data in each pbuf is kept in the ->len
         variable. */
      memcpy( &pcTxData[l], (u8_t*)q->payload, q->len );
      l += q->len;
    }    
  }
  
  //signal that packet should be sent();
        
  /* Setup the buffer descriptor for transmission */
  #ifdef NBUF_LITTLE_ENDIAN
  xENETTxDescriptors[ uxNextTxBuffer ].length = __REVSH(l);//nbuf->length + ETH_HDR_LEN;
  #else
  xENETTxDescriptors[ uxNextTxBuffer ].length = l;//nbuf->length + ETH_HDR_LEN;
  #endif
  xENETTxDescriptors[ uxNextTxBuffer ].status |= (TX_BD_R | TX_BD_L);
                
  #ifdef ENHANCED_BD
  xENETTxDescriptors[ uxNextTxBuffer ].bdu = 0x00000000;
  xENETTxDescriptors[ uxNextTxBuffer ].ebd_status = TX_BD_INT | TX_BD_TS;// | TX_BD_IINS | TX_BD_PINS;
  #endif
                
  /* Continue the Tx DMA task (in case it was waiting for a new TxBD) */
  ENET_TDAR = ENET_TDAR_TDAR_MASK;

  uxNextTxBuffer++;
  if( uxNextTxBuffer >= configNUM_ENET_TX_BUFFERS )
  {
    uxNextTxBuffer = 0;
  }

#if ETH_PAD_SIZE
  pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
#endif
  
  LINK_STATS_INC(link.xmit);

  return ERR_OK;
}

/**
 * Should allocate a pbuf and transfer the bytes of the incoming
 * packet from the interface into the pbuf.
 *
 * @param netif the lwip network interface structure for this ethernetif
 * @return a pbuf filled with the received packet (including MAC header)
 *         NULL on memory error
 */
static struct pbuf *
low_level_input(struct netif *netif)
{
//FSL:  struct ethernetif *ethernetif = netif->state;
  u32_t l = 0;
  struct pbuf *p, *q;
  u16_t len;
  #ifdef NBUF_LITTLE_ENDIAN
  u8_t *data_temp;
  #endif

  ( void ) netif;
  
  l = 0;
  p = NULL;
  
  /* Obtain the size of the packet and put it into the "len"
     variable. */
  #ifdef NBUF_LITTLE_ENDIAN
  len = __REVSH(xENETRxDescriptors[ uxNextRxBuffer ].length);
  #else
  len = xENETRxDescriptors[ uxNextRxBuffer ].length;
  #endif

  if( ( len != 0 ) && ( ( xENETRxDescriptors[ uxNextRxBuffer ].status & RX_BD_E ) == 0 ) )
  {  
  
     #if ETH_PAD_SIZE
     len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
     #endif

     /* We allocate a pbuf chain of pbufs from the pool. */
     p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
  
     if (p != NULL) 
     {
        #if ETH_PAD_SIZE
        pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
        #endif

        /* We iterate over the pbuf chain until we have read the entire
         * packet into the pbuf. */
        for(q = p; q != NULL; q = q->next) 
        {
           /* Read enough bytes to fill this pbuf in the chain. The
            * available data in the pbuf is given by the q->len
            * variable.
            * This does not necessarily have to be a memcpy, you can also preallocate
            * pbufs for a DMA-enabled MAC and after receiving truncate it to the
            * actually received size. In this case, ensure the tot_len member of the
            * pbuf is the sum of the chained pbuf len members.
            */
            #ifdef NBUF_LITTLE_ENDIAN
            data_temp = (u8_t *)__REV((u32_t)xENETRxDescriptors[ uxNextRxBuffer ].data);
            memcpy((u8_t*)q->payload, &( data_temp[l] ), q->len);
            #else
            memcpy((u8_t*)q->payload, &( xENETRxDescriptors[ uxNextRxBuffer ].data[l] ), q->len);
            #endif
            l = l + q->len;
                
            #ifdef ENHANCED_BD
	    //FSL: not implemented at stack level
            //rx_packet->ebd_status = RxNBUF[index_rxbd].ebd_status;
	    #ifdef NBUF_LITTLE_ENDIAN	
            //rx_packet->timestamp = __REV(RxNBUF[index_rxbd].timestamp);
            //rx_packet->length_proto_type = __REVSH(RxNBUF[index_rxbd].length_proto_type);
	    //rx_packet->payload_checksum = __REVSH(RxNBUF[index_rxbd].payload_checksum);
            #else
            //rx_packet->timestamp = RxNBUF[index_rxbd].timestamp;
	    //rx_packet->length_proto_type = RxNBUF[index_rxbd].length_proto_type;
	    //rx_packet->payload_checksum = RxNBUF[index_rxbd].payload_checksum;
            #endif
            #endif
        }

        #if ETH_PAD_SIZE
        pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
        LINK_STATS_INC(link.recv);
        #endif
     }
     else
     {
        //drop packet();
        LINK_STATS_INC(link.memerr);
        LINK_STATS_INC(link.drop);     
     }
    
     //acknowledge that packet has been read();
     /* Free the descriptor. */
     xENETRxDescriptors[ uxNextRxBuffer ].status |= RX_BD_E;
     ENET_RDAR = ENET_RDAR_RDAR_MASK;
    
     uxNextRxBuffer++;
     if( uxNextRxBuffer >= configNUM_ENET_RX_BUFFERS )
     {
        uxNextRxBuffer = 0;
     }
  } 
  
  return p;  
}

/**
 * This function should be called when a packet is ready to be read
 * from the interface. It uses the function low_level_input() that
 * should handle the actual reception of bytes from the network
 * interface. Then the type of the received packet is determined and
 * the appropriate input function is called.
 *
 * @param netif the lwip network interface structure for this ethernetif
 */
static void
ethernetif_input(/*FSL:struct netif *netif*/void *pParams)
{
//FSL:  struct ethernetif *ethernetif;
  struct netif *netif;
  struct eth_hdr *ethhdr;
  struct pbuf *p;

//FSL:  ethernetif = netif->state;
  netif = (struct netif*) pParams;

  for( ;; )
  {  
    do
    {
      /* move received packet into a new pbuf */
      p = low_level_input(netif);
      /* no packet could be read, silently ignore this */
      if (p == NULL)
      {
	/* No packet could be read.  Wait a for an interrupt to tell us
	   there is more data available. */
	xSemaphoreTake( xENETSemaphore, netifBLOCK_TIME_WAITING_FOR_INPUT );        
      }
    }while( p == NULL );  
    /* points to packet payload, which starts with an Ethernet header */
    ethhdr = p->payload;

    switch (htons(ethhdr->type)) 
    {
      /* IP or ARP packet? */
      case ETHTYPE_IP:
      case ETHTYPE_ARP:
    #if PPPOE_SUPPORT
      /* PPPoE packet? */
      case ETHTYPE_PPPOEDISC:
      case ETHTYPE_PPPOE:
    #endif /* PPPOE_SUPPORT */
        /* full packet send to tcpip_thread to process */
        if (netif->input(p, netif)!=ERR_OK)
         { LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
           pbuf_free(p);
           p = NULL;
         }
        break;
    
      default:
        pbuf_free(p);
        p = NULL;
        break;
    }
  }
}

/**
 * Should be called at the beginning of the program to set up the
 * network interface. It calls the function low_level_init() to do the
 * actual setup of the hardware.
 *
 * This function should be passed as a parameter to netif_add().
 *
 * @param netif the lwip network interface structure for this ethernetif
 * @return ERR_OK if the loopif is initialized
 *         ERR_MEM if private data couldn't be allocated
 *         any other err_t on error
 */
err_t
ethernetif_init(struct netif *netif)
{
  struct ethernetif *ethernetif;

  LWIP_ASSERT("netif != NULL", (netif != NULL));
    
  ethernetif = mem_malloc(sizeof(struct ethernetif));
  if (ethernetif == NULL) {
    LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_init: out of memory\n"));
    return ERR_MEM;
  }

#if LWIP_NETIF_HOSTNAME
  /* Initialize interface hostname */
  netif->hostname = "lwip";
#endif /* LWIP_NETIF_HOSTNAME */

  /*
   * Initialize the snmp variables and counters inside the struct netif.
   * The last argument should be replaced with your link speed, in units
   * of bits per second.
   */
  NETIF_INIT_SNMP(netif, snmp_ifType_ethernet_csmacd, LINK_SPEED_OF_YOUR_NETIF_IN_BPS);

  netif->state = ethernetif;
  netif->name[0] = IFNAME0;
  netif->name[1] = IFNAME1;
  /* We directly use etharp_output() here to save a function call.
   * You can instead declare your own function an call etharp_output()
   * from it if you have to do some checks before sending (e.g. if link
   * is available...) */
  netif->output = etharp_output;
  netif->linkoutput = low_level_output;
  
  ethernetif->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);
  
  /* initialize the hardware */
  low_level_init(netif);

  return ERR_OK;
}

/*-----------------------------------------------------------*/

static void prvInitialiseENETBuffers( void )
{
unsigned portBASE_TYPE ux;
unsigned char *pcBufPointer;

  pcBufPointer = &( xENETTxDescriptors_unaligned[ 0 ] );
  while( ( ( unsigned long ) pcBufPointer & 0x0fUL ) != 0 )
  {
    pcBufPointer++;
  }
  
  xENETTxDescriptors = ( NBUF * ) pcBufPointer;
  
  pcBufPointer = &( xENETRxDescriptors_unaligned[ 0 ] );
  while( ( ( unsigned long ) pcBufPointer & 0x0fUL ) != 0 )
  {
    pcBufPointer++;
  }
  
  xENETRxDescriptors = ( NBUF * ) pcBufPointer;

  /* Setup the buffers and descriptors. */
  pcBufPointer = &( ucENETTxBuffers[ 0 ] );
  while( ( ( unsigned long ) pcBufPointer & 0x0fUL ) != 0 )
  {
    pcBufPointer++;
  }

  for( ux = 0; ux < configNUM_ENET_TX_BUFFERS; ux++ )
  {
    xENETTxDescriptors[ ux ].status = TX_BD_TC;
    #ifdef NBUF_LITTLE_ENDIAN
    xENETTxDescriptors[ ux ].data = (uint8_t *)__REV((uint32_t)pcBufPointer);
    #else
    xENETTxDescriptors[ ux ].data = pcBufPointer;
    #endif
    pcBufPointer += configENET_TX_BUFFER_SIZE;
    xENETTxDescriptors[ ux ].length = 0;
    #ifdef ENHANCED_BD
    xENETTxDescriptors[ ux ].ebd_status = TX_BD_IINS | TX_BD_PINS;
    #endif
  }

  pcBufPointer = &( ucENETRxBuffers[ 0 ] );
  while( ( ( unsigned long ) pcBufPointer & 0x0fUL ) != 0 )
  {
    pcBufPointer++;
  }
  
  for( ux = 0; ux < configNUM_ENET_RX_BUFFERS; ux++ )
  {
      xENETRxDescriptors[ ux ].status = RX_BD_E;
      xENETRxDescriptors[ ux ].length = 0;
      #ifdef NBUF_LITTLE_ENDIAN
      xENETRxDescriptors[ ux ].data = (uint8_t *)__REV((uint32_t)pcBufPointer);
      #else
      xENETRxDescriptors[ ux ].data = pcBufPointer;
      #endif
      pcBufPointer += configENET_RX_BUFFER_SIZE;
      #ifdef ENHANCED_BD
      xENETRxDescriptors[ ux ].bdu = 0x00000000;
      xENETRxDescriptors[ ux ].ebd_status = RX_BD_INT;
      #endif    
  }

  /* Set the wrap bit in the last descriptors to form a ring. */
  xENETTxDescriptors[ configNUM_ENET_TX_BUFFERS - 1 ].status |= TX_BD_W;
  xENETRxDescriptors[ configNUM_ENET_RX_BUFFERS - 1 ].status |= RX_BD_W;

  uxNextRxBuffer = 0;
  uxNextTxBuffer = 0;
}
/*-----------------------------------------------------------*/

void vENETISRHandler( void )
{
unsigned long ulEvent;
portBASE_TYPE xHighPriorityTaskWoken = pdFALSE;
   
  /* Determine the cause of the interrupt. */
  ulEvent = ENET_EIR & ENET_EIMR;
  ENET_EIR = ulEvent;
  
  if( ( ulEvent & ENET_EIR_RXB_MASK ) || ( ulEvent & ENET_EIR_RXF_MASK ) )
  {
    /* A packet has been received.  Wake the handler task. */
    xSemaphoreGiveFromISR( xENETSemaphore, &xHighPriorityTaskWoken );
  }

  if (ulEvent & ( ENET_EIR_UN_MASK | ENET_EIR_RL_MASK | ENET_EIR_LC_MASK | ENET_EIR_EBERR_MASK | ENET_EIR_BABT_MASK | ENET_EIR_BABR_MASK | ENET_EIR_EBERR_MASK ) )
  {
    /* Sledge hammer error handling. */
    prvInitialiseENETBuffers();
    ENET_RDAR = ENET_RDAR_RDAR_MASK;
  }

  portEND_SWITCHING_ISR( xHighPriorityTaskWoken );
}

#endif /* 0 */