first commit for opensource
first commit for opensource
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228
net/lwip/port/src/ethernetif.c
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228
net/lwip/port/src/ethernetif.c
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/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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/*
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* This file is a skeleton for developing Ethernet network interface
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* drivers for lwIP. Add code to the low_level functions and do a
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* search-and-replace for the word "ethernetif" to replace it with
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* something that better describes your network interface.
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*/
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#include "lwip/def.h"
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#include "lwip/mem.h"
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#include "lwip/timeouts.h"
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#include "netif/etharp.h"
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#include "ethernetif.h"
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#include "string.h"
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/* Define those to better describe your network interface. */
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#define IFNAME0 's'
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#define IFNAME1 't'
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static struct netif *the_netif = NULL;
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static ethernetif_drv_t ethernetif_drv = { NULL };
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int ethernetif_drv_register(ethernetif_drv_t *drv)
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{
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if (!drv) {
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return ERR_ARG;
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}
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ethernetif_drv.init = drv->init;
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ethernetif_drv.write = drv->write;
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ethernetif_drv.read = drv->read;
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return ERR_OK;
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}
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/**
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* In this function, the hardware should be initialized.
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* Called from ethernetif_init().
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*
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* @param netif the already initialized lwip network interface structure
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* for this ethernetif
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*/
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static void ethernetif_drv_init(struct netif *netif)
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{
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if (ethernetif_drv.init) {
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(void)ethernetif_drv.init(netif);
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the_netif = netif;
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}
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}
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/**
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* This function should do the actual transmission of the packet. The packet is
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* contained in the pbuf that is passed to the function. This pbuf
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* might be chained.
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*
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* @param netif the lwip network interface structure for this ethernetif
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* @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)
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* @return ERR_OK if the packet could be sent
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* an err_t value if the packet couldn't be sent
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*
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* @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to
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* strange results. You might consider waiting for space in the DMA queue
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* to become availale since the stack doesn't retry to send a packet
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* dropped because of memory failure (except for the TCP timers).
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*/
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static err_t ethernetif_drv_write(struct netif *netif, struct pbuf *p)
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{
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err_t rc = ERR_IF;
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if (ethernetif_drv.write) {
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rc = ethernetif_drv.write(netif, p);
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}
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return rc;
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}
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/**
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* Should allocate a pbuf and transfer the bytes of the incoming
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* packet from the interface into the pbuf.
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*
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* @param netif the lwip network interface structure for this ethernetif
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* @return a pbuf filled with the received packet (including MAC header)
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* NULL on memory error
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*/
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static struct pbuf *ethernetif_drv_read(struct netif *netif)
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{
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struct pbuf *p = NULL;
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if (ethernetif_drv.read) {
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p = ethernetif_drv.read(netif);
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}
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return p;
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}
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#if !LWIP_ARP
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/**
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* This function has to be completed by user in case of ARP OFF.
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*
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* @param netif the lwip network interface structure for this ethernetif
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* @return ERR_OK if ...
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*/
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static err_t low_level_output_arp_off(struct netif *netif, struct pbuf *q, const ip4_addr_t *ipaddr)
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{
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err_t errval;
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errval = ERR_OK;
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return errval;
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}
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#endif /* LWIP_ARP */
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/**
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* This function is the ethernetif_input task, it is processed when a packet
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* is ready to be read from the interface. It uses the function ethernetif_drv_read()
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* that should handle the actual reception of bytes from the network
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* interface. Then the type of the received packet is determined and
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* the appropriate input function is called.
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*
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* @param netif the lwip network interface structure for this ethernetif
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*/
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void ethernetif_input(void *arg)
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{
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err_t rc;
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struct pbuf *p;
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/* move received packet into a new pbuf */
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do {
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SYS_ARCH_DECL_PROTECT(sr);
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SYS_ARCH_PROTECT(sr);
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p = ethernetif_drv_read(the_netif);
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SYS_ARCH_UNPROTECT(sr);
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if (!p) {
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return;
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}
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rc = the_netif->input(p, the_netif);
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if (rc != ERR_OK) {
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LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
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pbuf_free(p);
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p = NULL;
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}
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} while (p);
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}
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/**
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* Should be called at the beginning of the program to set up the
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* network interface. It calls the function ethernetif_drv_init() to do the
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* actual setup of the hardware.
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*
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* This function should be passed as a parameter to netif_add().
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*
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* @param netif the lwip network interface structure for this ethernetif
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* @return ERR_OK if the loopif is initialized
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* ERR_MEM if private data couldn't be allocated
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* any other err_t on error
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*/
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err_t ethernetif_init(struct netif *netif)
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{
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LWIP_ASSERT("netif != NULL", (netif != NULL));
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#if LWIP_NETIF_HOSTNAME
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/* Initialize interface hostname */
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netif->hostname = "lwip";
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#endif /* LWIP_NETIF_HOSTNAME */
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netif->name[0] = IFNAME0;
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netif->name[1] = IFNAME1;
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/* We directly use etharp_output() here to save a function call.
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* You can instead declare your own function an call etharp_output()
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* from it if you have to do some checks before sending (e.g. if link
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* is available...) */
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#if LWIP_IPV4
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#if LWIP_ARP || LWIP_ETHERNET
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#if LWIP_ARP
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netif->output = etharp_output;
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#else
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/* The user should write ist own code in low_level_output_arp_off function */
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netif->output = low_level_output_arp_off;
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#endif /* LWIP_ARP */
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#endif /* LWIP_ARP || LWIP_ETHERNET */
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#endif /* LWIP_IPV4 */
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#if LWIP_IPV6
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netif->output_ip6 = ethip6_output;
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#endif /* LWIP_IPV6 */
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netif->linkoutput = ethernetif_drv_write;
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/* initialize the hardware */
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ethernetif_drv_init(netif);
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return ERR_OK;
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}
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