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/**
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* @file
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* Ethernet Interface Skeleton
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*
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*/
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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/opt.h"
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#if 0 /* don't build, this is only a skeleton, see previous comment */
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#include "lwip/def.h"
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#include "lwip/mem.h"
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#include "lwip/pbuf.h"
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#include "lwip/sys.h"
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#include <lwip/stats.h>
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#include <lwip/snmp.h>
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#include "netif/etharp.h"
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#include "netif/ppp_oe.h"
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/* Define those to better describe your network interface. */
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#define IFNAME0 'e'
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#define IFNAME1 'n'
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/**
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* Helper struct to hold private data used to operate your ethernet interface.
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* Keeping the ethernet address of the MAC in this struct is not necessary
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* as it is already kept in the struct netif.
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* But this is only an example, anyway...
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*/
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struct ethernetif {
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struct eth_addr *ethaddr;
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/* Add whatever per-interface state that is needed here. */
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};
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/* Forward declarations. */
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static void ethernetif_input(struct netif *netif);
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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
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low_level_init(struct netif *netif)
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{
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struct ethernetif *ethernetif = netif->state;
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/* set MAC hardware address length */
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netif->hwaddr_len = ETHARP_HWADDR_LEN;
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/* set MAC hardware address */
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netif->hwaddr[0] = ;
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...
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netif->hwaddr[5] = ;
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/* maximum transfer unit */
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netif->mtu = 1500;
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/* device capabilities */
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/* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */
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netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_LINK_UP;
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/* Do whatever else is needed to initialize interface. */
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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
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low_level_output(struct netif *netif, struct pbuf *p)
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{
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struct ethernetif *ethernetif = netif->state;
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struct pbuf *q;
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initiate transfer();
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#if ETH_PAD_SIZE
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pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
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#endif
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for(q = p; q != NULL; q = q->next) {
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/* Send the data from the pbuf to the interface, one pbuf at a
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time. The size of the data in each pbuf is kept in the ->len
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variable. */
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send data from(q->payload, q->len);
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}
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signal that packet should be sent();
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#if ETH_PAD_SIZE
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pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
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#endif
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LINK_STATS_INC(link.xmit);
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return ERR_OK;
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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 *
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low_level_input(struct netif *netif)
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{
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struct ethernetif *ethernetif = netif->state;
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struct pbuf *p, *q;
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u16_t len;
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/* Obtain the size of the packet and put it into the "len"
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variable. */
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len = ;
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#if ETH_PAD_SIZE
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len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
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#endif
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/* We allocate a pbuf chain of pbufs from the pool. */
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p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
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if (p != NULL) {
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180
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#if ETH_PAD_SIZE
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pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
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#endif
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/* We iterate over the pbuf chain until we have read the entire
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* packet into the pbuf. */
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for(q = p; q != NULL; q = q->next) {
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/* Read enough bytes to fill this pbuf in the chain. The
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* available data in the pbuf is given by the q->len
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* variable.
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* This does not necessarily have to be a memcpy, you can also preallocate
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* pbufs for a DMA-enabled MAC and after receiving truncate it to the
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* actually received size. In this case, ensure the tot_len member of the
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* pbuf is the sum of the chained pbuf len members.
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*/
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read data into(q->payload, q->len);
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}
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acknowledge that packet has been read();
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199
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200
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#if ETH_PAD_SIZE
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pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
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202
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#endif
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203
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LINK_STATS_INC(link.recv);
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} else {
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drop packet();
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207
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LINK_STATS_INC(link.memerr);
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208
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LINK_STATS_INC(link.drop);
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209
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}
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210
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211
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return p;
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}
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213
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214
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/**
|
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215
|
* This function should be called when a packet is ready to be read
|
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* from the interface. It uses the function low_level_input() that
|
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217
|
* should handle the actual reception of bytes from the network
|
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218
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* interface. Then the type of the received packet is determined and
|
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219
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* the appropriate input function is called.
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*
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221
|
* @param netif the lwip network interface structure for this ethernetif
|
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222
|
*/
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static void
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|
224
|
ethernetif_input(struct netif *netif)
|
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|
225
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{
|
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|
226
|
struct ethernetif *ethernetif;
|
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|
227
|
struct eth_hdr *ethhdr;
|
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|
228
|
struct pbuf *p;
|
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|
229
|
|
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|
230
|
ethernetif = netif->state;
|
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|
231
|
|
| mbed714 |
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|
232
|
/* move received packet into a new pbuf */
|
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|
233
|
p = low_level_input(netif);
|
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|
234
|
/* no packet could be read, silently ignore this */
|
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|
235
|
if (p == NULL) return;
|
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|
236
|
/* points to packet payload, which starts with an Ethernet header */
|
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|
237
|
ethhdr = p->payload;
|
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|
238
|
|
| mbed714 |
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|
239
|
switch (htons(ethhdr->type)) {
|
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|
240
|
/* IP or ARP packet? */
|
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|
241
|
case ETHTYPE_IP:
|
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|
242
|
case ETHTYPE_ARP:
|
| mbed714 |
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|
243
|
#if PPPOE_SUPPORT
|
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|
244
|
/* PPPoE packet? */
|
| mbed714 |
0:d616ece2d859
|
245
|
case ETHTYPE_PPPOEDISC:
|
| mbed714 |
0:d616ece2d859
|
246
|
case ETHTYPE_PPPOE:
|
| mbed714 |
0:d616ece2d859
|
247
|
#endif /* PPPOE_SUPPORT */
|
| mbed714 |
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|
248
|
/* full packet send to tcpip_thread to process */
|
| mbed714 |
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|
249
|
if (netif->input(p, netif)!=ERR_OK)
|
| mbed714 |
0:d616ece2d859
|
250
|
{ LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
|
| mbed714 |
0:d616ece2d859
|
251
|
pbuf_free(p);
|
| mbed714 |
0:d616ece2d859
|
252
|
p = NULL;
|
| mbed714 |
0:d616ece2d859
|
253
|
}
|
| mbed714 |
0:d616ece2d859
|
254
|
break;
|
| mbed714 |
0:d616ece2d859
|
255
|
|
| mbed714 |
0:d616ece2d859
|
256
|
default:
|
| mbed714 |
0:d616ece2d859
|
257
|
pbuf_free(p);
|
| mbed714 |
0:d616ece2d859
|
258
|
p = NULL;
|
| mbed714 |
0:d616ece2d859
|
259
|
break;
|
| mbed714 |
0:d616ece2d859
|
260
|
}
|
| mbed714 |
0:d616ece2d859
|
261
|
}
|
| mbed714 |
0:d616ece2d859
|
262
|
|
| mbed714 |
0:d616ece2d859
|
263
|
/**
|
| mbed714 |
0:d616ece2d859
|
264
|
* Should be called at the beginning of the program to set up the
|
| mbed714 |
0:d616ece2d859
|
265
|
* network interface. It calls the function low_level_init() to do the
|
| mbed714 |
0:d616ece2d859
|
266
|
* actual setup of the hardware.
|
| mbed714 |
0:d616ece2d859
|
267
|
*
|
| mbed714 |
0:d616ece2d859
|
268
|
* This function should be passed as a parameter to netif_add().
|
| mbed714 |
0:d616ece2d859
|
269
|
*
|
| mbed714 |
0:d616ece2d859
|
270
|
* @param netif the lwip network interface structure for this ethernetif
|
| mbed714 |
0:d616ece2d859
|
271
|
* @return ERR_OK if the loopif is initialized
|
| mbed714 |
0:d616ece2d859
|
272
|
* ERR_MEM if private data couldn't be allocated
|
| mbed714 |
0:d616ece2d859
|
273
|
* any other err_t on error
|
| mbed714 |
0:d616ece2d859
|
274
|
*/
|
| mbed714 |
0:d616ece2d859
|
275
|
err_t
|
| mbed714 |
0:d616ece2d859
|
276
|
ethernetif_init(struct netif *netif)
|
| mbed714 |
0:d616ece2d859
|
277
|
{
|
| mbed714 |
0:d616ece2d859
|
278
|
struct ethernetif *ethernetif;
|
| mbed714 |
0:d616ece2d859
|
279
|
|
| mbed714 |
0:d616ece2d859
|
280
|
LWIP_ASSERT("netif != NULL", (netif != NULL));
|
| mbed714 |
0:d616ece2d859
|
281
|
|
| mbed714 |
0:d616ece2d859
|
282
|
ethernetif = mem_malloc(sizeof(struct ethernetif));
|
| mbed714 |
0:d616ece2d859
|
283
|
if (ethernetif == NULL) {
|
| mbed714 |
0:d616ece2d859
|
284
|
LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_init: out of memory\n"));
|
| mbed714 |
0:d616ece2d859
|
285
|
return ERR_MEM;
|
| mbed714 |
0:d616ece2d859
|
286
|
}
|
| mbed714 |
0:d616ece2d859
|
287
|
|
| mbed714 |
0:d616ece2d859
|
288
|
#if LWIP_NETIF_HOSTNAME
|
| mbed714 |
0:d616ece2d859
|
289
|
/* Initialize interface hostname */
|
| mbed714 |
0:d616ece2d859
|
290
|
netif->hostname = "lwip";
|
| mbed714 |
0:d616ece2d859
|
291
|
#endif /* LWIP_NETIF_HOSTNAME */
|
| mbed714 |
0:d616ece2d859
|
292
|
|
| mbed714 |
0:d616ece2d859
|
293
|
/*
|
| mbed714 |
0:d616ece2d859
|
294
|
* Initialize the snmp variables and counters inside the struct netif.
|
| mbed714 |
0:d616ece2d859
|
295
|
* The last argument should be replaced with your link speed, in units
|
| mbed714 |
0:d616ece2d859
|
296
|
* of bits per second.
|
| mbed714 |
0:d616ece2d859
|
297
|
*/
|
| mbed714 |
0:d616ece2d859
|
298
|
NETIF_INIT_SNMP(netif, snmp_ifType_ethernet_csmacd, LINK_SPEED_OF_YOUR_NETIF_IN_BPS);
|
| mbed714 |
0:d616ece2d859
|
299
|
|
| mbed714 |
0:d616ece2d859
|
300
|
netif->state = ethernetif;
|
| mbed714 |
0:d616ece2d859
|
301
|
netif->name[0] = IFNAME0;
|
| mbed714 |
0:d616ece2d859
|
302
|
netif->name[1] = IFNAME1;
|
| mbed714 |
0:d616ece2d859
|
303
|
/* We directly use etharp_output() here to save a function call.
|
| mbed714 |
0:d616ece2d859
|
304
|
* You can instead declare your own function an call etharp_output()
|
| mbed714 |
0:d616ece2d859
|
305
|
* from it if you have to do some checks before sending (e.g. if link
|
| mbed714 |
0:d616ece2d859
|
306
|
* is available...) */
|
| mbed714 |
0:d616ece2d859
|
307
|
netif->output = etharp_output;
|
| mbed714 |
0:d616ece2d859
|
308
|
netif->linkoutput = low_level_output;
|
| mbed714 |
0:d616ece2d859
|
309
|
|
| mbed714 |
0:d616ece2d859
|
310
|
ethernetif->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);
|
| mbed714 |
0:d616ece2d859
|
311
|
|
| mbed714 |
0:d616ece2d859
|
312
|
/* initialize the hardware */
|
| mbed714 |
0:d616ece2d859
|
313
|
low_level_init(netif);
|
| mbed714 |
0:d616ece2d859
|
314
|
|
| mbed714 |
0:d616ece2d859
|
315
|
return ERR_OK;
|
| mbed714 |
0:d616ece2d859
|
316
|
}
|
| mbed714 |
0:d616ece2d859
|
317
|
|
| mbed714 |
0:d616ece2d859
|
318
|
#endif /* 0 */
|
Daniel Peter