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lwip/netif/ethernetif.c@0:ac1725ba162c, 2010-11-09 (annotated)

Committer:: segundo
Date:: Tue Nov 09 20:54:15 2010 +0000
Revision:: 0:ac1725ba162c

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User	Revision	Line number	New contents of line
segundo	0:ac1725ba162c	1	/**
segundo	0:ac1725ba162c	2	* @file
segundo	0:ac1725ba162c	3	* Ethernet Interface Skeleton
segundo	0:ac1725ba162c	4	*
segundo	0:ac1725ba162c	5	*/
segundo	0:ac1725ba162c	6
segundo	0:ac1725ba162c	7	/*
segundo	0:ac1725ba162c	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
segundo	0:ac1725ba162c	9	* All rights reserved.
segundo	0:ac1725ba162c	10	*
segundo	0:ac1725ba162c	11	* Redistribution and use in source and binary forms, with or without modification,
segundo	0:ac1725ba162c	12	* are permitted provided that the following conditions are met:
segundo	0:ac1725ba162c	13	*
segundo	0:ac1725ba162c	14	* 1. Redistributions of source code must retain the above copyright notice,
segundo	0:ac1725ba162c	15	* this list of conditions and the following disclaimer.
segundo	0:ac1725ba162c	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
segundo	0:ac1725ba162c	17	* this list of conditions and the following disclaimer in the documentation
segundo	0:ac1725ba162c	18	* and/or other materials provided with the distribution.
segundo	0:ac1725ba162c	19	* 3. The name of the author may not be used to endorse or promote products
segundo	0:ac1725ba162c	20	* derived from this software without specific prior written permission.
segundo	0:ac1725ba162c	21	*
segundo	0:ac1725ba162c	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
segundo	0:ac1725ba162c	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
segundo	0:ac1725ba162c	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
segundo	0:ac1725ba162c	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
segundo	0:ac1725ba162c	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
segundo	0:ac1725ba162c	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
segundo	0:ac1725ba162c	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
segundo	0:ac1725ba162c	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
segundo	0:ac1725ba162c	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
segundo	0:ac1725ba162c	31	* OF SUCH DAMAGE.
segundo	0:ac1725ba162c	32	*
segundo	0:ac1725ba162c	33	* This file is part of the lwIP TCP/IP stack.
segundo	0:ac1725ba162c	34	*
segundo	0:ac1725ba162c	35	* Author: Adam Dunkels <adam@sics.se>
segundo	0:ac1725ba162c	36	*
segundo	0:ac1725ba162c	37	*/
segundo	0:ac1725ba162c	38
segundo	0:ac1725ba162c	39	/*
segundo	0:ac1725ba162c	40	* This file is a skeleton for developing Ethernet network interface
segundo	0:ac1725ba162c	41	* drivers for lwIP. Add code to the low_level functions and do a
segundo	0:ac1725ba162c	42	* search-and-replace for the word "ethernetif" to replace it with
segundo	0:ac1725ba162c	43	* something that better describes your network interface.
segundo	0:ac1725ba162c	44	*/
segundo	0:ac1725ba162c	45
segundo	0:ac1725ba162c	46	#include "lwip/opt.h"
segundo	0:ac1725ba162c	47
segundo	0:ac1725ba162c	48	#if 0 /* don't build, this is only a skeleton, see previous comment */
segundo	0:ac1725ba162c	49
segundo	0:ac1725ba162c	50	#include "lwip/def.h"
segundo	0:ac1725ba162c	51	#include "lwip/mem.h"
segundo	0:ac1725ba162c	52	#include "lwip/pbuf.h"
segundo	0:ac1725ba162c	53	#include "lwip/sys.h"
segundo	0:ac1725ba162c	54	#include <lwip/stats.h>
segundo	0:ac1725ba162c	55	#include <lwip/snmp.h>
segundo	0:ac1725ba162c	56	#include "netif/etharp.h"
segundo	0:ac1725ba162c	57	#include "netif/ppp_oe.h"
segundo	0:ac1725ba162c	58
segundo	0:ac1725ba162c	59	/* Define those to better describe your network interface. */
segundo	0:ac1725ba162c	60	#define IFNAME0 'e'
segundo	0:ac1725ba162c	61	#define IFNAME1 'n'
segundo	0:ac1725ba162c	62
segundo	0:ac1725ba162c	63	/**
segundo	0:ac1725ba162c	64	* Helper struct to hold private data used to operate your ethernet interface.
segundo	0:ac1725ba162c	65	* Keeping the ethernet address of the MAC in this struct is not necessary
segundo	0:ac1725ba162c	66	* as it is already kept in the struct netif.
segundo	0:ac1725ba162c	67	* But this is only an example, anyway...
segundo	0:ac1725ba162c	68	*/
segundo	0:ac1725ba162c	69	struct ethernetif {
segundo	0:ac1725ba162c	70	struct eth_addr *ethaddr;
segundo	0:ac1725ba162c	71	/* Add whatever per-interface state that is needed here. */
segundo	0:ac1725ba162c	72	};
segundo	0:ac1725ba162c	73
segundo	0:ac1725ba162c	74	/* Forward declarations. */
segundo	0:ac1725ba162c	75	static void ethernetif_input(struct netif *netif);
segundo	0:ac1725ba162c	76
segundo	0:ac1725ba162c	77	/**
segundo	0:ac1725ba162c	78	* In this function, the hardware should be initialized.
segundo	0:ac1725ba162c	79	* Called from ethernetif_init().
segundo	0:ac1725ba162c	80	*
segundo	0:ac1725ba162c	81	* @param netif the already initialized lwip network interface structure
segundo	0:ac1725ba162c	82	* for this ethernetif
segundo	0:ac1725ba162c	83	*/
segundo	0:ac1725ba162c	84	static void
segundo	0:ac1725ba162c	85	low_level_init(struct netif *netif)
segundo	0:ac1725ba162c	86	{
segundo	0:ac1725ba162c	87	struct ethernetif *ethernetif = netif->state;
segundo	0:ac1725ba162c	88
segundo	0:ac1725ba162c	89	/* set MAC hardware address length */
segundo	0:ac1725ba162c	90	netif->hwaddr_len = ETHARP_HWADDR_LEN;
segundo	0:ac1725ba162c	91
segundo	0:ac1725ba162c	92	/* set MAC hardware address */
segundo	0:ac1725ba162c	93	netif->hwaddr[0] = ;
segundo	0:ac1725ba162c	94	...
segundo	0:ac1725ba162c	95	netif->hwaddr[5] = ;
segundo	0:ac1725ba162c	96
segundo	0:ac1725ba162c	97	/* maximum transfer unit */
segundo	0:ac1725ba162c	98	netif->mtu = 1500;
segundo	0:ac1725ba162c	99
segundo	0:ac1725ba162c	100	/* device capabilities */
segundo	0:ac1725ba162c	101	/* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */
segundo	0:ac1725ba162c	102	netif->flags = NETIF_FLAG_BROADCAST \| NETIF_FLAG_ETHARP \| NETIF_FLAG_LINK_UP;
segundo	0:ac1725ba162c	103
segundo	0:ac1725ba162c	104	/* Do whatever else is needed to initialize interface. */
segundo	0:ac1725ba162c	105	}
segundo	0:ac1725ba162c	106
segundo	0:ac1725ba162c	107	/**
segundo	0:ac1725ba162c	108	* This function should do the actual transmission of the packet. The packet is
segundo	0:ac1725ba162c	109	* contained in the pbuf that is passed to the function. This pbuf
segundo	0:ac1725ba162c	110	* might be chained.
segundo	0:ac1725ba162c	111	*
segundo	0:ac1725ba162c	112	* @param netif the lwip network interface structure for this ethernetif
segundo	0:ac1725ba162c	113	* @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)
segundo	0:ac1725ba162c	114	* @return ERR_OK if the packet could be sent
segundo	0:ac1725ba162c	115	* an err_t value if the packet couldn't be sent
segundo	0:ac1725ba162c	116	*
segundo	0:ac1725ba162c	117	* @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to
segundo	0:ac1725ba162c	118	* strange results. You might consider waiting for space in the DMA queue
segundo	0:ac1725ba162c	119	* to become availale since the stack doesn't retry to send a packet
segundo	0:ac1725ba162c	120	* dropped because of memory failure (except for the TCP timers).
segundo	0:ac1725ba162c	121	*/
segundo	0:ac1725ba162c	122
segundo	0:ac1725ba162c	123	static err_t
segundo	0:ac1725ba162c	124	low_level_output(struct netif netif, struct pbuf p)
segundo	0:ac1725ba162c	125	{
segundo	0:ac1725ba162c	126	struct ethernetif *ethernetif = netif->state;
segundo	0:ac1725ba162c	127	struct pbuf *q;
segundo	0:ac1725ba162c	128
segundo	0:ac1725ba162c	129	initiate transfer();
segundo	0:ac1725ba162c	130
segundo	0:ac1725ba162c	131	#if ETH_PAD_SIZE
segundo	0:ac1725ba162c	132	pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
segundo	0:ac1725ba162c	133	#endif
segundo	0:ac1725ba162c	134
segundo	0:ac1725ba162c	135	for(q = p; q != NULL; q = q->next) {
segundo	0:ac1725ba162c	136	/* Send the data from the pbuf to the interface, one pbuf at a
segundo	0:ac1725ba162c	137	time. The size of the data in each pbuf is kept in the ->len
segundo	0:ac1725ba162c	138	variable. */
segundo	0:ac1725ba162c	139	send data from(q->payload, q->len);
segundo	0:ac1725ba162c	140	}
segundo	0:ac1725ba162c	141
segundo	0:ac1725ba162c	142	signal that packet should be sent();
segundo	0:ac1725ba162c	143
segundo	0:ac1725ba162c	144	#if ETH_PAD_SIZE
segundo	0:ac1725ba162c	145	pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
segundo	0:ac1725ba162c	146	#endif
segundo	0:ac1725ba162c	147
segundo	0:ac1725ba162c	148	LINK_STATS_INC(link.xmit);
segundo	0:ac1725ba162c	149
segundo	0:ac1725ba162c	150	return ERR_OK;
segundo	0:ac1725ba162c	151	}
segundo	0:ac1725ba162c	152
segundo	0:ac1725ba162c	153	/**
segundo	0:ac1725ba162c	154	* Should allocate a pbuf and transfer the bytes of the incoming
segundo	0:ac1725ba162c	155	* packet from the interface into the pbuf.
segundo	0:ac1725ba162c	156	*
segundo	0:ac1725ba162c	157	* @param netif the lwip network interface structure for this ethernetif
segundo	0:ac1725ba162c	158	* @return a pbuf filled with the received packet (including MAC header)
segundo	0:ac1725ba162c	159	* NULL on memory error
segundo	0:ac1725ba162c	160	*/
segundo	0:ac1725ba162c	161	static struct pbuf *
segundo	0:ac1725ba162c	162	low_level_input(struct netif *netif)
segundo	0:ac1725ba162c	163	{
segundo	0:ac1725ba162c	164	struct ethernetif *ethernetif = netif->state;
segundo	0:ac1725ba162c	165	struct pbuf p, q;
segundo	0:ac1725ba162c	166	u16_t len;
segundo	0:ac1725ba162c	167
segundo	0:ac1725ba162c	168	/* Obtain the size of the packet and put it into the "len"
segundo	0:ac1725ba162c	169	variable. */
segundo	0:ac1725ba162c	170	len = ;
segundo	0:ac1725ba162c	171
segundo	0:ac1725ba162c	172	#if ETH_PAD_SIZE
segundo	0:ac1725ba162c	173	len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
segundo	0:ac1725ba162c	174	#endif
segundo	0:ac1725ba162c	175
segundo	0:ac1725ba162c	176	/* We allocate a pbuf chain of pbufs from the pool. */
segundo	0:ac1725ba162c	177	p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
segundo	0:ac1725ba162c	178
segundo	0:ac1725ba162c	179	if (p != NULL) {
segundo	0:ac1725ba162c	180
segundo	0:ac1725ba162c	181	#if ETH_PAD_SIZE
segundo	0:ac1725ba162c	182	pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
segundo	0:ac1725ba162c	183	#endif
segundo	0:ac1725ba162c	184
segundo	0:ac1725ba162c	185	/* We iterate over the pbuf chain until we have read the entire
segundo	0:ac1725ba162c	186	* packet into the pbuf. */
segundo	0:ac1725ba162c	187	for(q = p; q != NULL; q = q->next) {
segundo	0:ac1725ba162c	188	/* Read enough bytes to fill this pbuf in the chain. The
segundo	0:ac1725ba162c	189	* available data in the pbuf is given by the q->len
segundo	0:ac1725ba162c	190	* variable.
segundo	0:ac1725ba162c	191	* This does not necessarily have to be a memcpy, you can also preallocate
segundo	0:ac1725ba162c	192	* pbufs for a DMA-enabled MAC and after receiving truncate it to the
segundo	0:ac1725ba162c	193	* actually received size. In this case, ensure the tot_len member of the
segundo	0:ac1725ba162c	194	* pbuf is the sum of the chained pbuf len members.
segundo	0:ac1725ba162c	195	*/
segundo	0:ac1725ba162c	196	read data into(q->payload, q->len);
segundo	0:ac1725ba162c	197	}
segundo	0:ac1725ba162c	198	acknowledge that packet has been read();
segundo	0:ac1725ba162c	199
segundo	0:ac1725ba162c	200	#if ETH_PAD_SIZE
segundo	0:ac1725ba162c	201	pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
segundo	0:ac1725ba162c	202	#endif
segundo	0:ac1725ba162c	203
segundo	0:ac1725ba162c	204	LINK_STATS_INC(link.recv);
segundo	0:ac1725ba162c	205	} else {
segundo	0:ac1725ba162c	206	drop packet();
segundo	0:ac1725ba162c	207	LINK_STATS_INC(link.memerr);
segundo	0:ac1725ba162c	208	LINK_STATS_INC(link.drop);
segundo	0:ac1725ba162c	209	}
segundo	0:ac1725ba162c	210
segundo	0:ac1725ba162c	211	return p;
segundo	0:ac1725ba162c	212	}
segundo	0:ac1725ba162c	213
segundo	0:ac1725ba162c	214	/**
segundo	0:ac1725ba162c	215	* This function should be called when a packet is ready to be read
segundo	0:ac1725ba162c	216	* from the interface. It uses the function low_level_input() that
segundo	0:ac1725ba162c	217	* should handle the actual reception of bytes from the network
segundo	0:ac1725ba162c	218	* interface. Then the type of the received packet is determined and
segundo	0:ac1725ba162c	219	* the appropriate input function is called.
segundo	0:ac1725ba162c	220	*
segundo	0:ac1725ba162c	221	* @param netif the lwip network interface structure for this ethernetif
segundo	0:ac1725ba162c	222	*/
segundo	0:ac1725ba162c	223	static void
segundo	0:ac1725ba162c	224	ethernetif_input(struct netif *netif)
segundo	0:ac1725ba162c	225	{
segundo	0:ac1725ba162c	226	struct ethernetif *ethernetif;
segundo	0:ac1725ba162c	227	struct eth_hdr *ethhdr;
segundo	0:ac1725ba162c	228	struct pbuf *p;
segundo	0:ac1725ba162c	229
segundo	0:ac1725ba162c	230	ethernetif = netif->state;
segundo	0:ac1725ba162c	231
segundo	0:ac1725ba162c	232	/* move received packet into a new pbuf */
segundo	0:ac1725ba162c	233	p = low_level_input(netif);
segundo	0:ac1725ba162c	234	/* no packet could be read, silently ignore this */
segundo	0:ac1725ba162c	235	if (p == NULL) return;
segundo	0:ac1725ba162c	236	/* points to packet payload, which starts with an Ethernet header */
segundo	0:ac1725ba162c	237	ethhdr = p->payload;
segundo	0:ac1725ba162c	238
segundo	0:ac1725ba162c	239	switch (htons(ethhdr->type)) {
segundo	0:ac1725ba162c	240	/* IP or ARP packet? */
segundo	0:ac1725ba162c	241	case ETHTYPE_IP:
segundo	0:ac1725ba162c	242	case ETHTYPE_ARP:
segundo	0:ac1725ba162c	243	#if PPPOE_SUPPORT
segundo	0:ac1725ba162c	244	/* PPPoE packet? */
segundo	0:ac1725ba162c	245	case ETHTYPE_PPPOEDISC:
segundo	0:ac1725ba162c	246	case ETHTYPE_PPPOE:
segundo	0:ac1725ba162c	247	#endif /* PPPOE_SUPPORT */
segundo	0:ac1725ba162c	248	/* full packet send to tcpip_thread to process */
segundo	0:ac1725ba162c	249	if (netif->input(p, netif)!=ERR_OK)
segundo	0:ac1725ba162c	250	{ LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
segundo	0:ac1725ba162c	251	pbuf_free(p);
segundo	0:ac1725ba162c	252	p = NULL;
segundo	0:ac1725ba162c	253	}
segundo	0:ac1725ba162c	254	break;
segundo	0:ac1725ba162c	255
segundo	0:ac1725ba162c	256	default:
segundo	0:ac1725ba162c	257	pbuf_free(p);
segundo	0:ac1725ba162c	258	p = NULL;
segundo	0:ac1725ba162c	259	break;
segundo	0:ac1725ba162c	260	}
segundo	0:ac1725ba162c	261	}
segundo	0:ac1725ba162c	262
segundo	0:ac1725ba162c	263	/**
segundo	0:ac1725ba162c	264	* Should be called at the beginning of the program to set up the
segundo	0:ac1725ba162c	265	* network interface. It calls the function low_level_init() to do the
segundo	0:ac1725ba162c	266	* actual setup of the hardware.
segundo	0:ac1725ba162c	267	*
segundo	0:ac1725ba162c	268	* This function should be passed as a parameter to netif_add().
segundo	0:ac1725ba162c	269	*
segundo	0:ac1725ba162c	270	* @param netif the lwip network interface structure for this ethernetif
segundo	0:ac1725ba162c	271	* @return ERR_OK if the loopif is initialized
segundo	0:ac1725ba162c	272	* ERR_MEM if private data couldn't be allocated
segundo	0:ac1725ba162c	273	* any other err_t on error
segundo	0:ac1725ba162c	274	*/
segundo	0:ac1725ba162c	275	err_t
segundo	0:ac1725ba162c	276	ethernetif_init(struct netif *netif)
segundo	0:ac1725ba162c	277	{
segundo	0:ac1725ba162c	278	struct ethernetif *ethernetif;
segundo	0:ac1725ba162c	279
segundo	0:ac1725ba162c	280	LWIP_ASSERT("netif != NULL", (netif != NULL));
segundo	0:ac1725ba162c	281
segundo	0:ac1725ba162c	282	ethernetif = mem_malloc(sizeof(struct ethernetif));
segundo	0:ac1725ba162c	283	if (ethernetif == NULL) {
segundo	0:ac1725ba162c	284	LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_init: out of memory\n"));
segundo	0:ac1725ba162c	285	return ERR_MEM;
segundo	0:ac1725ba162c	286	}
segundo	0:ac1725ba162c	287
segundo	0:ac1725ba162c	288	#if LWIP_NETIF_HOSTNAME
segundo	0:ac1725ba162c	289	/* Initialize interface hostname */
segundo	0:ac1725ba162c	290	netif->hostname = "lwip";
segundo	0:ac1725ba162c	291	#endif /* LWIP_NETIF_HOSTNAME */
segundo	0:ac1725ba162c	292
segundo	0:ac1725ba162c	293	/*
segundo	0:ac1725ba162c	294	* Initialize the snmp variables and counters inside the struct netif.
segundo	0:ac1725ba162c	295	* The last argument should be replaced with your link speed, in units
segundo	0:ac1725ba162c	296	* of bits per second.
segundo	0:ac1725ba162c	297	*/
segundo	0:ac1725ba162c	298	NETIF_INIT_SNMP(netif, snmp_ifType_ethernet_csmacd, LINK_SPEED_OF_YOUR_NETIF_IN_BPS);
segundo	0:ac1725ba162c	299
segundo	0:ac1725ba162c	300	netif->state = ethernetif;
segundo	0:ac1725ba162c	301	netif->name[0] = IFNAME0;
segundo	0:ac1725ba162c	302	netif->name[1] = IFNAME1;
segundo	0:ac1725ba162c	303	/* We directly use etharp_output() here to save a function call.
segundo	0:ac1725ba162c	304	* You can instead declare your own function an call etharp_output()
segundo	0:ac1725ba162c	305	* from it if you have to do some checks before sending (e.g. if link
segundo	0:ac1725ba162c	306	* is available...) */
segundo	0:ac1725ba162c	307	netif->output = etharp_output;
segundo	0:ac1725ba162c	308	netif->linkoutput = low_level_output;
segundo	0:ac1725ba162c	309
segundo	0:ac1725ba162c	310	ethernetif->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);
segundo	0:ac1725ba162c	311
segundo	0:ac1725ba162c	312	/* initialize the hardware */
segundo	0:ac1725ba162c	313	low_level_init(netif);
segundo	0:ac1725ba162c	314
segundo	0:ac1725ba162c	315	return ERR_OK;
segundo	0:ac1725ba162c	316	}
segundo	0:ac1725ba162c	317
segundo	0:ac1725ba162c	318	#endif /* 0 */

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Type:	Library
Created:	06 Mar 2013
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lwip/netif/ethernetif.c@0:ac1725ba162c, 2010-11-09 (annotated)

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