net_iface.cpp File Reference

This file defines the net_iface functions, which sit between the MityDSP network drivers and the lwIP stack. More...

#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include "core/DspError.h"
#include "net/net_drvr/net_drvr.h"
#include "net/net_iface.h"
#include "netif/etharp.h"
#include "netif_access.h"

Classes
struct	tsPbufQueue
struct	tsMbxData

Functions
static int	net_iface_rx_thread (struct netif *apNetif)
static err_t	net_iface_output (struct netif *apNetif, struct pbuf *apPbuf, struct ip_addr *apIpAddr)
static err_t	net_iface_linkoutput (struct netif *apNetif, struct pbuf *apPbuf)
static err_t	net_iface_mac_filter (struct netif *apNetif, struct ip_addr *apIp, unsigned char anAdd)
void	net_iface_set_defaults (tsNetIface *apNetIface, tcNetDrvr *apNetDrvr)
void	net_iface_copy_pbuff (tsNetIface *apNetIfaceDst, tsNetIface *apNetIfaceSrc)
err_t	net_iface_init (struct netif *apNetif)
void	net_iface_rx_cb (void *apBuffer, int anLen, void *apUser, bool abInIsr)
void *	net_iface_buf_alloc (int anLen, void *apUser)

Variables
struct eth_addr	ethbroadcast

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Detailed Description

This file defines the net_iface functions, which sit between the MityDSP network drivers and the lwIP stack.

o 0 | / Copyright (c) 2005-2009 (CL)—o Critical Link, LLC \ O

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Function Documentation

int net_iface_rx_thread ( struct netif *  apNetif )

static

This function is started as a thread by net_iface_init. It pends on a mailbox which is filled by net_iface_rx_cb with packet data. The payload retrieved via the mailbox is compared to the queue of pbufs allocated by net_iface_buf_alloc. When a match is found, the underlying pbuf is passed directly to the network stack.

Parameters:

[in]

apNetif

Pointer to the netif structure.

Returns:

Zero.

err_t net_iface_output ( struct netif *  apNetif, struct pbuf *  apPbuf, struct ip_addr *  apIpAddr  )

static

This function is called by the TCP/IP stack when an IP packet should be sent. It calls the function etharp_output() to resolve the MAC address, which eventually calls net_iface_linkoutput() to do the actual transmission of the packet.

Parameters:

[in]	apNetif	Pointer to the netif structure.
[in]	apPbuf	Pointer to the pbuf containing the packet.
[in]	apIpAddr	Pointer to the IP address of the destination.

Returns:

Zero on success, non-zero if an error occurred.

err_t net_iface_linkoutput ( struct netif *  apNetif, struct pbuf *  apPbuf  )

static

This function is called to direct the actual transmission of the packet. The packet is contained in a pbuf (or chain of pbufs), which must be passed to the network driver transmit routine.

Parameters:

[in]	apNetif	Pointer to the netif structure.
[in]	apPbuf	Pointer to the pbuf containing the packet.

Returns:

Zero on success, non-zero if an error occurred.

err_t net_iface_mac_filter ( struct netif *  apNetif, struct ip_addr *  apIp, unsigned char  anAdd  )

static

This function is called to add or remove a particular MAC address to/from the interface's multicast filter list.

Parameters:

[in]	apNetif	Pointer to the netif structure.
[in]	apIp	Pointer to an ip_addr structure.
[in]	anAdd	Zero to remove the filter, non-zero to add.

Returns:

Zero on success, non-zero if an error occurred.

void net_iface_set_defaults	(	tsNetIface *	apNetIface,
		tcNetDrvr *	apNetDrvr
	)

This function provides defaults for the tsNetIface structure.

Parameters:

[in]	apNetIface	Pointer to the tsNetIface structure to set to default values.
[in]	apNetDrvr	Pointer to the network driver to associate with the provided tsNetIface.

Returns:

None.

void net_iface_copy_pbuff	(	tsNetIface *	apNetIfaceDst,
		tsNetIface *	apNetIfaceSrc
	)

err_t net_iface_init

(

struct netif *

apNetif

)

This function should be registered as the lwIP network interface (netif) initialization function. When activated, it sets up the interface, starts the receiver thread, and initializes the network hardware.

Parameters:

[in]

apNetif

Pointer to the netif structure for the interface being initialized.

Returns:

Zero upon success, -1 for failure

void net_iface_rx_cb	(	void *	apBuffer,
		int	anLen,
		void *	apUser,
		bool	abInIsr
	)

This function is registered as the receive packet callback for the network driver by the "open" call in net_iface_init. When activated, it posts the pointer to the received data to the net_iface_rx_thread.

Parameters:

[in]	apBuffer	Pointer to the received packet.
[in]	anLen	The length of the received packet.
[in]	apUser	Pointer to the netif structure.
[in]	abInIsr	True if called from ISR (not used).

Returns:

None.

void* net_iface_buf_alloc	(	int	anLen,
		void *	apUser
	)

This function is registered as the buffer allocation callback for the network driver by the "open" call in net_iface_init. When activated, it provides a valid location where the next packet is to be written.

Note:

The pbuf size must be set greater or equal to the max packet size in lwipopts.h.

Parameters:

[in]	anLen	The length of the buffer to allocate.
[in]	apUser	Pointer to the netif structure.

Returns:

Payload area of an allocated pbuf.

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Variable Documentation

struct eth_addr ethbroadcast