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NetStack/lwip/netif/ethernetif.c@0:1a61c61d0845, 2012-04-03 (annotated)

Committer:: dcoban
Date:: Tue Apr 03 18:43:13 2012 +0000
Revision:: 0:1a61c61d0845

Who changed what in which revision?

User	Revision	Line number	New contents of line
dcoban	0:1a61c61d0845	1	/**
dcoban	0:1a61c61d0845	2	* @file
dcoban	0:1a61c61d0845	3	* Ethernet Interface Skeleton
dcoban	0:1a61c61d0845	4	*
dcoban	0:1a61c61d0845	5	*/
dcoban	0:1a61c61d0845	6
dcoban	0:1a61c61d0845	7	/*
dcoban	0:1a61c61d0845	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
dcoban	0:1a61c61d0845	9	* All rights reserved.
dcoban	0:1a61c61d0845	10	*
dcoban	0:1a61c61d0845	11	* Redistribution and use in source and binary forms, with or without modification,
dcoban	0:1a61c61d0845	12	* are permitted provided that the following conditions are met:
dcoban	0:1a61c61d0845	13	*
dcoban	0:1a61c61d0845	14	* 1. Redistributions of source code must retain the above copyright notice,
dcoban	0:1a61c61d0845	15	* this list of conditions and the following disclaimer.
dcoban	0:1a61c61d0845	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
dcoban	0:1a61c61d0845	17	* this list of conditions and the following disclaimer in the documentation
dcoban	0:1a61c61d0845	18	* and/or other materials provided with the distribution.
dcoban	0:1a61c61d0845	19	* 3. The name of the author may not be used to endorse or promote products
dcoban	0:1a61c61d0845	20	* derived from this software without specific prior written permission.
dcoban	0:1a61c61d0845	21	*
dcoban	0:1a61c61d0845	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
dcoban	0:1a61c61d0845	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
dcoban	0:1a61c61d0845	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
dcoban	0:1a61c61d0845	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
dcoban	0:1a61c61d0845	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
dcoban	0:1a61c61d0845	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
dcoban	0:1a61c61d0845	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
dcoban	0:1a61c61d0845	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
dcoban	0:1a61c61d0845	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
dcoban	0:1a61c61d0845	31	* OF SUCH DAMAGE.
dcoban	0:1a61c61d0845	32	*
dcoban	0:1a61c61d0845	33	* This file is part of the lwIP TCP/IP stack.
dcoban	0:1a61c61d0845	34	*
dcoban	0:1a61c61d0845	35	* Author: Adam Dunkels <adam@sics.se>
dcoban	0:1a61c61d0845	36	*
dcoban	0:1a61c61d0845	37	*/
dcoban	0:1a61c61d0845	38
dcoban	0:1a61c61d0845	39	/*
dcoban	0:1a61c61d0845	40	* This file is a skeleton for developing Ethernet network interface
dcoban	0:1a61c61d0845	41	* drivers for lwIP. Add code to the low_level functions and do a
dcoban	0:1a61c61d0845	42	* search-and-replace for the word "ethernetif" to replace it with
dcoban	0:1a61c61d0845	43	* something that better describes your network interface.
dcoban	0:1a61c61d0845	44	*/
dcoban	0:1a61c61d0845	45
dcoban	0:1a61c61d0845	46	#include "lwip/opt.h"
dcoban	0:1a61c61d0845	47
dcoban	0:1a61c61d0845	48	#if 0 /* don't build, this is only a skeleton, see previous comment */
dcoban	0:1a61c61d0845	49
dcoban	0:1a61c61d0845	50	#include "lwip/def.h"
dcoban	0:1a61c61d0845	51	#include "lwip/mem.h"
dcoban	0:1a61c61d0845	52	#include "lwip/pbuf.h"
dcoban	0:1a61c61d0845	53	#include "lwip/sys.h"
dcoban	0:1a61c61d0845	54	#include <lwip/stats.h>
dcoban	0:1a61c61d0845	55	#include <lwip/snmp.h>
dcoban	0:1a61c61d0845	56	#include "netif/etharp.h"
dcoban	0:1a61c61d0845	57	#include "netif/ppp_oe.h"
dcoban	0:1a61c61d0845	58
dcoban	0:1a61c61d0845	59	/* Define those to better describe your network interface. */
dcoban	0:1a61c61d0845	60	#define IFNAME0 'e'
dcoban	0:1a61c61d0845	61	#define IFNAME1 'n'
dcoban	0:1a61c61d0845	62
dcoban	0:1a61c61d0845	63	/**
dcoban	0:1a61c61d0845	64	* Helper struct to hold private data used to operate your ethernet interface.
dcoban	0:1a61c61d0845	65	* Keeping the ethernet address of the MAC in this struct is not necessary
dcoban	0:1a61c61d0845	66	* as it is already kept in the struct netif.
dcoban	0:1a61c61d0845	67	* But this is only an example, anyway...
dcoban	0:1a61c61d0845	68	*/
dcoban	0:1a61c61d0845	69	struct ethernetif {
dcoban	0:1a61c61d0845	70	struct eth_addr *ethaddr;
dcoban	0:1a61c61d0845	71	/* Add whatever per-interface state that is needed here. */
dcoban	0:1a61c61d0845	72	};
dcoban	0:1a61c61d0845	73
dcoban	0:1a61c61d0845	74	/* Forward declarations. */
dcoban	0:1a61c61d0845	75	static void ethernetif_input(struct netif *netif);
dcoban	0:1a61c61d0845	76
dcoban	0:1a61c61d0845	77	/**
dcoban	0:1a61c61d0845	78	* In this function, the hardware should be initialized.
dcoban	0:1a61c61d0845	79	* Called from ethernetif_init().
dcoban	0:1a61c61d0845	80	*
dcoban	0:1a61c61d0845	81	* @param netif the already initialized lwip network interface structure
dcoban	0:1a61c61d0845	82	* for this ethernetif
dcoban	0:1a61c61d0845	83	*/
dcoban	0:1a61c61d0845	84	static void
dcoban	0:1a61c61d0845	85	low_level_init(struct netif *netif)
dcoban	0:1a61c61d0845	86	{
dcoban	0:1a61c61d0845	87	struct ethernetif *ethernetif = netif->state;
dcoban	0:1a61c61d0845	88
dcoban	0:1a61c61d0845	89	/* set MAC hardware address length */
dcoban	0:1a61c61d0845	90	netif->hwaddr_len = ETHARP_HWADDR_LEN;
dcoban	0:1a61c61d0845	91
dcoban	0:1a61c61d0845	92	/* set MAC hardware address */
dcoban	0:1a61c61d0845	93	netif->hwaddr[0] = ;
dcoban	0:1a61c61d0845	94	...
dcoban	0:1a61c61d0845	95	netif->hwaddr[5] = ;
dcoban	0:1a61c61d0845	96
dcoban	0:1a61c61d0845	97	/* maximum transfer unit */
dcoban	0:1a61c61d0845	98	netif->mtu = 1500;
dcoban	0:1a61c61d0845	99
dcoban	0:1a61c61d0845	100	/* device capabilities */
dcoban	0:1a61c61d0845	101	/* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */
dcoban	0:1a61c61d0845	102	netif->flags = NETIF_FLAG_BROADCAST \| NETIF_FLAG_ETHARP \| NETIF_FLAG_LINK_UP;
dcoban	0:1a61c61d0845	103
dcoban	0:1a61c61d0845	104	/* Do whatever else is needed to initialize interface. */
dcoban	0:1a61c61d0845	105	}
dcoban	0:1a61c61d0845	106
dcoban	0:1a61c61d0845	107	/**
dcoban	0:1a61c61d0845	108	* This function should do the actual transmission of the packet. The packet is
dcoban	0:1a61c61d0845	109	* contained in the pbuf that is passed to the function. This pbuf
dcoban	0:1a61c61d0845	110	* might be chained.
dcoban	0:1a61c61d0845	111	*
dcoban	0:1a61c61d0845	112	* @param netif the lwip network interface structure for this ethernetif
dcoban	0:1a61c61d0845	113	* @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)
dcoban	0:1a61c61d0845	114	* @return ERR_OK if the packet could be sent
dcoban	0:1a61c61d0845	115	* an err_t value if the packet couldn't be sent
dcoban	0:1a61c61d0845	116	*
dcoban	0:1a61c61d0845	117	* @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to
dcoban	0:1a61c61d0845	118	* strange results. You might consider waiting for space in the DMA queue
dcoban	0:1a61c61d0845	119	* to become availale since the stack doesn't retry to send a packet
dcoban	0:1a61c61d0845	120	* dropped because of memory failure (except for the TCP timers).
dcoban	0:1a61c61d0845	121	*/
dcoban	0:1a61c61d0845	122
dcoban	0:1a61c61d0845	123	static err_t
dcoban	0:1a61c61d0845	124	low_level_output(struct netif netif, struct pbuf p)
dcoban	0:1a61c61d0845	125	{
dcoban	0:1a61c61d0845	126	struct ethernetif *ethernetif = netif->state;
dcoban	0:1a61c61d0845	127	struct pbuf *q;
dcoban	0:1a61c61d0845	128
dcoban	0:1a61c61d0845	129	initiate transfer();
dcoban	0:1a61c61d0845	130
dcoban	0:1a61c61d0845	131	#if ETH_PAD_SIZE
dcoban	0:1a61c61d0845	132	pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
dcoban	0:1a61c61d0845	133	#endif
dcoban	0:1a61c61d0845	134
dcoban	0:1a61c61d0845	135	for(q = p; q != NULL; q = q->next) {
dcoban	0:1a61c61d0845	136	/* Send the data from the pbuf to the interface, one pbuf at a
dcoban	0:1a61c61d0845	137	time. The size of the data in each pbuf is kept in the ->len
dcoban	0:1a61c61d0845	138	variable. */
dcoban	0:1a61c61d0845	139	send data from(q->payload, q->len);
dcoban	0:1a61c61d0845	140	}
dcoban	0:1a61c61d0845	141
dcoban	0:1a61c61d0845	142	signal that packet should be sent();
dcoban	0:1a61c61d0845	143
dcoban	0:1a61c61d0845	144	#if ETH_PAD_SIZE
dcoban	0:1a61c61d0845	145	pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
dcoban	0:1a61c61d0845	146	#endif
dcoban	0:1a61c61d0845	147
dcoban	0:1a61c61d0845	148	LINK_STATS_INC(link.xmit);
dcoban	0:1a61c61d0845	149
dcoban	0:1a61c61d0845	150	return ERR_OK;
dcoban	0:1a61c61d0845	151	}
dcoban	0:1a61c61d0845	152
dcoban	0:1a61c61d0845	153	/**
dcoban	0:1a61c61d0845	154	* Should allocate a pbuf and transfer the bytes of the incoming
dcoban	0:1a61c61d0845	155	* packet from the interface into the pbuf.
dcoban	0:1a61c61d0845	156	*
dcoban	0:1a61c61d0845	157	* @param netif the lwip network interface structure for this ethernetif
dcoban	0:1a61c61d0845	158	* @return a pbuf filled with the received packet (including MAC header)
dcoban	0:1a61c61d0845	159	* NULL on memory error
dcoban	0:1a61c61d0845	160	*/
dcoban	0:1a61c61d0845	161	static struct pbuf *
dcoban	0:1a61c61d0845	162	low_level_input(struct netif *netif)
dcoban	0:1a61c61d0845	163	{
dcoban	0:1a61c61d0845	164	struct ethernetif *ethernetif = netif->state;
dcoban	0:1a61c61d0845	165	struct pbuf p, q;
dcoban	0:1a61c61d0845	166	u16_t len;
dcoban	0:1a61c61d0845	167
dcoban	0:1a61c61d0845	168	/* Obtain the size of the packet and put it into the "len"
dcoban	0:1a61c61d0845	169	variable. */
dcoban	0:1a61c61d0845	170	len = ;
dcoban	0:1a61c61d0845	171
dcoban	0:1a61c61d0845	172	#if ETH_PAD_SIZE
dcoban	0:1a61c61d0845	173	len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
dcoban	0:1a61c61d0845	174	#endif
dcoban	0:1a61c61d0845	175
dcoban	0:1a61c61d0845	176	/* We allocate a pbuf chain of pbufs from the pool. */
dcoban	0:1a61c61d0845	177	p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
dcoban	0:1a61c61d0845	178
dcoban	0:1a61c61d0845	179	if (p != NULL) {
dcoban	0:1a61c61d0845	180
dcoban	0:1a61c61d0845	181	#if ETH_PAD_SIZE
dcoban	0:1a61c61d0845	182	pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
dcoban	0:1a61c61d0845	183	#endif
dcoban	0:1a61c61d0845	184
dcoban	0:1a61c61d0845	185	/* We iterate over the pbuf chain until we have read the entire
dcoban	0:1a61c61d0845	186	* packet into the pbuf. */
dcoban	0:1a61c61d0845	187	for(q = p; q != NULL; q = q->next) {
dcoban	0:1a61c61d0845	188	/* Read enough bytes to fill this pbuf in the chain. The
dcoban	0:1a61c61d0845	189	* available data in the pbuf is given by the q->len
dcoban	0:1a61c61d0845	190	* variable.
dcoban	0:1a61c61d0845	191	* This does not necessarily have to be a memcpy, you can also preallocate
dcoban	0:1a61c61d0845	192	* pbufs for a DMA-enabled MAC and after receiving truncate it to the
dcoban	0:1a61c61d0845	193	* actually received size. In this case, ensure the tot_len member of the
dcoban	0:1a61c61d0845	194	* pbuf is the sum of the chained pbuf len members.
dcoban	0:1a61c61d0845	195	*/
dcoban	0:1a61c61d0845	196	read data into(q->payload, q->len);
dcoban	0:1a61c61d0845	197	}
dcoban	0:1a61c61d0845	198	acknowledge that packet has been read();
dcoban	0:1a61c61d0845	199
dcoban	0:1a61c61d0845	200	#if ETH_PAD_SIZE
dcoban	0:1a61c61d0845	201	pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
dcoban	0:1a61c61d0845	202	#endif
dcoban	0:1a61c61d0845	203
dcoban	0:1a61c61d0845	204	LINK_STATS_INC(link.recv);
dcoban	0:1a61c61d0845	205	} else {
dcoban	0:1a61c61d0845	206	drop packet();
dcoban	0:1a61c61d0845	207	LINK_STATS_INC(link.memerr);
dcoban	0:1a61c61d0845	208	LINK_STATS_INC(link.drop);
dcoban	0:1a61c61d0845	209	}
dcoban	0:1a61c61d0845	210
dcoban	0:1a61c61d0845	211	return p;
dcoban	0:1a61c61d0845	212	}
dcoban	0:1a61c61d0845	213
dcoban	0:1a61c61d0845	214	/**
dcoban	0:1a61c61d0845	215	* This function should be called when a packet is ready to be read
dcoban	0:1a61c61d0845	216	* from the interface. It uses the function low_level_input() that
dcoban	0:1a61c61d0845	217	* should handle the actual reception of bytes from the network
dcoban	0:1a61c61d0845	218	* interface. Then the type of the received packet is determined and
dcoban	0:1a61c61d0845	219	* the appropriate input function is called.
dcoban	0:1a61c61d0845	220	*
dcoban	0:1a61c61d0845	221	* @param netif the lwip network interface structure for this ethernetif
dcoban	0:1a61c61d0845	222	*/
dcoban	0:1a61c61d0845	223	static void
dcoban	0:1a61c61d0845	224	ethernetif_input(struct netif *netif)
dcoban	0:1a61c61d0845	225	{
dcoban	0:1a61c61d0845	226	struct ethernetif *ethernetif;
dcoban	0:1a61c61d0845	227	struct eth_hdr *ethhdr;
dcoban	0:1a61c61d0845	228	struct pbuf *p;
dcoban	0:1a61c61d0845	229
dcoban	0:1a61c61d0845	230	ethernetif = netif->state;
dcoban	0:1a61c61d0845	231
dcoban	0:1a61c61d0845	232	/* move received packet into a new pbuf */
dcoban	0:1a61c61d0845	233	p = low_level_input(netif);
dcoban	0:1a61c61d0845	234	/* no packet could be read, silently ignore this */
dcoban	0:1a61c61d0845	235	if (p == NULL) return;
dcoban	0:1a61c61d0845	236	/* points to packet payload, which starts with an Ethernet header */
dcoban	0:1a61c61d0845	237	ethhdr = p->payload;
dcoban	0:1a61c61d0845	238
dcoban	0:1a61c61d0845	239	switch (htons(ethhdr->type)) {
dcoban	0:1a61c61d0845	240	/* IP or ARP packet? */
dcoban	0:1a61c61d0845	241	case ETHTYPE_IP:
dcoban	0:1a61c61d0845	242	case ETHTYPE_ARP:
dcoban	0:1a61c61d0845	243	#if PPPOE_SUPPORT
dcoban	0:1a61c61d0845	244	/* PPPoE packet? */
dcoban	0:1a61c61d0845	245	case ETHTYPE_PPPOEDISC:
dcoban	0:1a61c61d0845	246	case ETHTYPE_PPPOE:
dcoban	0:1a61c61d0845	247	#endif /* PPPOE_SUPPORT */
dcoban	0:1a61c61d0845	248	/* full packet send to tcpip_thread to process */
dcoban	0:1a61c61d0845	249	if (netif->input(p, netif)!=ERR_OK)
dcoban	0:1a61c61d0845	250	{ LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
dcoban	0:1a61c61d0845	251	pbuf_free(p);
dcoban	0:1a61c61d0845	252	p = NULL;
dcoban	0:1a61c61d0845	253	}
dcoban	0:1a61c61d0845	254	break;
dcoban	0:1a61c61d0845	255
dcoban	0:1a61c61d0845	256	default:
dcoban	0:1a61c61d0845	257	pbuf_free(p);
dcoban	0:1a61c61d0845	258	p = NULL;
dcoban	0:1a61c61d0845	259	break;
dcoban	0:1a61c61d0845	260	}
dcoban	0:1a61c61d0845	261	}
dcoban	0:1a61c61d0845	262
dcoban	0:1a61c61d0845	263	/**
dcoban	0:1a61c61d0845	264	* Should be called at the beginning of the program to set up the
dcoban	0:1a61c61d0845	265	* network interface. It calls the function low_level_init() to do the
dcoban	0:1a61c61d0845	266	* actual setup of the hardware.
dcoban	0:1a61c61d0845	267	*
dcoban	0:1a61c61d0845	268	* This function should be passed as a parameter to netif_add().
dcoban	0:1a61c61d0845	269	*
dcoban	0:1a61c61d0845	270	* @param netif the lwip network interface structure for this ethernetif
dcoban	0:1a61c61d0845	271	* @return ERR_OK if the loopif is initialized
dcoban	0:1a61c61d0845	272	* ERR_MEM if private data couldn't be allocated
dcoban	0:1a61c61d0845	273	* any other err_t on error
dcoban	0:1a61c61d0845	274	*/
dcoban	0:1a61c61d0845	275	err_t
dcoban	0:1a61c61d0845	276	ethernetif_init(struct netif *netif)
dcoban	0:1a61c61d0845	277	{
dcoban	0:1a61c61d0845	278	struct ethernetif *ethernetif;
dcoban	0:1a61c61d0845	279
dcoban	0:1a61c61d0845	280	LWIP_ASSERT("netif != NULL", (netif != NULL));
dcoban	0:1a61c61d0845	281
dcoban	0:1a61c61d0845	282	ethernetif = mem_malloc(sizeof(struct ethernetif));
dcoban	0:1a61c61d0845	283	if (ethernetif == NULL) {
dcoban	0:1a61c61d0845	284	LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_init: out of memory\n"));
dcoban	0:1a61c61d0845	285	return ERR_MEM;
dcoban	0:1a61c61d0845	286	}
dcoban	0:1a61c61d0845	287
dcoban	0:1a61c61d0845	288	#if LWIP_NETIF_HOSTNAME
dcoban	0:1a61c61d0845	289	/* Initialize interface hostname */
dcoban	0:1a61c61d0845	290	netif->hostname = "lwip";
dcoban	0:1a61c61d0845	291	#endif /* LWIP_NETIF_HOSTNAME */
dcoban	0:1a61c61d0845	292
dcoban	0:1a61c61d0845	293	/*
dcoban	0:1a61c61d0845	294	* Initialize the snmp variables and counters inside the struct netif.
dcoban	0:1a61c61d0845	295	* The last argument should be replaced with your link speed, in units
dcoban	0:1a61c61d0845	296	* of bits per second.
dcoban	0:1a61c61d0845	297	*/
dcoban	0:1a61c61d0845	298	NETIF_INIT_SNMP(netif, snmp_ifType_ethernet_csmacd, LINK_SPEED_OF_YOUR_NETIF_IN_BPS);
dcoban	0:1a61c61d0845	299
dcoban	0:1a61c61d0845	300	netif->state = ethernetif;
dcoban	0:1a61c61d0845	301	netif->name[0] = IFNAME0;
dcoban	0:1a61c61d0845	302	netif->name[1] = IFNAME1;
dcoban	0:1a61c61d0845	303	/* We directly use etharp_output() here to save a function call.
dcoban	0:1a61c61d0845	304	* You can instead declare your own function an call etharp_output()
dcoban	0:1a61c61d0845	305	* from it if you have to do some checks before sending (e.g. if link
dcoban	0:1a61c61d0845	306	* is available...) */
dcoban	0:1a61c61d0845	307	netif->output = etharp_output;
dcoban	0:1a61c61d0845	308	netif->linkoutput = low_level_output;
dcoban	0:1a61c61d0845	309
dcoban	0:1a61c61d0845	310	ethernetif->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);
dcoban	0:1a61c61d0845	311
dcoban	0:1a61c61d0845	312	/* initialize the hardware */
dcoban	0:1a61c61d0845	313	low_level_init(netif);
dcoban	0:1a61c61d0845	314
dcoban	0:1a61c61d0845	315	return ERR_OK;
dcoban	0:1a61c61d0845	316	}
dcoban	0:1a61c61d0845	317
dcoban	0:1a61c61d0845	318	#endif /* 0 */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	03 Apr 2012
Imports:	2
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	4
Followers:	1

NetStack/lwip/netif/ethernetif.c@0:1a61c61d0845, 2012-04-03 (annotated)

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