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I have a problem getting this to work. Server only recieves half of the data being sent. Whats wrong

lwip/netif/ethernetif.c@0:66300c77c6e9, 2011-03-29 (annotated)

Committer:: tax
Date:: Tue Mar 29 13:20:15 2011 +0000
Revision:: 0:66300c77c6e9

Who changed what in which revision?

User	Revision	Line number	New contents of line
tax	0:66300c77c6e9	1	/**
tax	0:66300c77c6e9	2	* @file
tax	0:66300c77c6e9	3	* Ethernet Interface Skeleton
tax	0:66300c77c6e9	4	*
tax	0:66300c77c6e9	5	*/
tax	0:66300c77c6e9	6
tax	0:66300c77c6e9	7	/*
tax	0:66300c77c6e9	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
tax	0:66300c77c6e9	9	* All rights reserved.
tax	0:66300c77c6e9	10	*
tax	0:66300c77c6e9	11	* Redistribution and use in source and binary forms, with or without modification,
tax	0:66300c77c6e9	12	* are permitted provided that the following conditions are met:
tax	0:66300c77c6e9	13	*
tax	0:66300c77c6e9	14	* 1. Redistributions of source code must retain the above copyright notice,
tax	0:66300c77c6e9	15	* this list of conditions and the following disclaimer.
tax	0:66300c77c6e9	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
tax	0:66300c77c6e9	17	* this list of conditions and the following disclaimer in the documentation
tax	0:66300c77c6e9	18	* and/or other materials provided with the distribution.
tax	0:66300c77c6e9	19	* 3. The name of the author may not be used to endorse or promote products
tax	0:66300c77c6e9	20	* derived from this software without specific prior written permission.
tax	0:66300c77c6e9	21	*
tax	0:66300c77c6e9	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
tax	0:66300c77c6e9	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
tax	0:66300c77c6e9	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
tax	0:66300c77c6e9	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
tax	0:66300c77c6e9	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
tax	0:66300c77c6e9	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
tax	0:66300c77c6e9	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
tax	0:66300c77c6e9	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
tax	0:66300c77c6e9	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
tax	0:66300c77c6e9	31	* OF SUCH DAMAGE.
tax	0:66300c77c6e9	32	*
tax	0:66300c77c6e9	33	* This file is part of the lwIP TCP/IP stack.
tax	0:66300c77c6e9	34	*
tax	0:66300c77c6e9	35	* Author: Adam Dunkels <adam@sics.se>
tax	0:66300c77c6e9	36	*
tax	0:66300c77c6e9	37	*/
tax	0:66300c77c6e9	38
tax	0:66300c77c6e9	39	/*
tax	0:66300c77c6e9	40	* This file is a skeleton for developing Ethernet network interface
tax	0:66300c77c6e9	41	* drivers for lwIP. Add code to the low_level functions and do a
tax	0:66300c77c6e9	42	* search-and-replace for the word "ethernetif" to replace it with
tax	0:66300c77c6e9	43	* something that better describes your network interface.
tax	0:66300c77c6e9	44	*/
tax	0:66300c77c6e9	45
tax	0:66300c77c6e9	46	#include "lwip/opt.h"
tax	0:66300c77c6e9	47
tax	0:66300c77c6e9	48	#if 0 /* don't build, this is only a skeleton, see previous comment */
tax	0:66300c77c6e9	49
tax	0:66300c77c6e9	50	#include "lwip/def.h"
tax	0:66300c77c6e9	51	#include "lwip/mem.h"
tax	0:66300c77c6e9	52	#include "lwip/pbuf.h"
tax	0:66300c77c6e9	53	#include "lwip/sys.h"
tax	0:66300c77c6e9	54	#include <lwip/stats.h>
tax	0:66300c77c6e9	55	#include <lwip/snmp.h>
tax	0:66300c77c6e9	56	#include "netif/etharp.h"
tax	0:66300c77c6e9	57	#include "netif/ppp_oe.h"
tax	0:66300c77c6e9	58
tax	0:66300c77c6e9	59	/* Define those to better describe your network interface. */
tax	0:66300c77c6e9	60	#define IFNAME0 'e'
tax	0:66300c77c6e9	61	#define IFNAME1 'n'
tax	0:66300c77c6e9	62
tax	0:66300c77c6e9	63	/**
tax	0:66300c77c6e9	64	* Helper struct to hold private data used to operate your ethernet interface.
tax	0:66300c77c6e9	65	* Keeping the ethernet address of the MAC in this struct is not necessary
tax	0:66300c77c6e9	66	* as it is already kept in the struct netif.
tax	0:66300c77c6e9	67	* But this is only an example, anyway...
tax	0:66300c77c6e9	68	*/
tax	0:66300c77c6e9	69	struct ethernetif {
tax	0:66300c77c6e9	70	struct eth_addr *ethaddr;
tax	0:66300c77c6e9	71	/* Add whatever per-interface state that is needed here. */
tax	0:66300c77c6e9	72	};
tax	0:66300c77c6e9	73
tax	0:66300c77c6e9	74	/* Forward declarations. */
tax	0:66300c77c6e9	75	static void ethernetif_input(struct netif *netif);
tax	0:66300c77c6e9	76
tax	0:66300c77c6e9	77	/**
tax	0:66300c77c6e9	78	* In this function, the hardware should be initialized.
tax	0:66300c77c6e9	79	* Called from ethernetif_init().
tax	0:66300c77c6e9	80	*
tax	0:66300c77c6e9	81	* @param netif the already initialized lwip network interface structure
tax	0:66300c77c6e9	82	* for this ethernetif
tax	0:66300c77c6e9	83	*/
tax	0:66300c77c6e9	84	static void
tax	0:66300c77c6e9	85	low_level_init(struct netif *netif)
tax	0:66300c77c6e9	86	{
tax	0:66300c77c6e9	87	struct ethernetif *ethernetif = netif->state;
tax	0:66300c77c6e9	88
tax	0:66300c77c6e9	89	/* set MAC hardware address length */
tax	0:66300c77c6e9	90	netif->hwaddr_len = ETHARP_HWADDR_LEN;
tax	0:66300c77c6e9	91
tax	0:66300c77c6e9	92	/* set MAC hardware address */
tax	0:66300c77c6e9	93	netif->hwaddr[0] = ;
tax	0:66300c77c6e9	94	...
tax	0:66300c77c6e9	95	netif->hwaddr[5] = ;
tax	0:66300c77c6e9	96
tax	0:66300c77c6e9	97	/* maximum transfer unit */
tax	0:66300c77c6e9	98	netif->mtu = 1500;
tax	0:66300c77c6e9	99
tax	0:66300c77c6e9	100	/* device capabilities */
tax	0:66300c77c6e9	101	/* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */
tax	0:66300c77c6e9	102	netif->flags = NETIF_FLAG_BROADCAST \| NETIF_FLAG_ETHARP \| NETIF_FLAG_LINK_UP;
tax	0:66300c77c6e9	103
tax	0:66300c77c6e9	104	/* Do whatever else is needed to initialize interface. */
tax	0:66300c77c6e9	105	}
tax	0:66300c77c6e9	106
tax	0:66300c77c6e9	107	/**
tax	0:66300c77c6e9	108	* This function should do the actual transmission of the packet. The packet is
tax	0:66300c77c6e9	109	* contained in the pbuf that is passed to the function. This pbuf
tax	0:66300c77c6e9	110	* might be chained.
tax	0:66300c77c6e9	111	*
tax	0:66300c77c6e9	112	* @param netif the lwip network interface structure for this ethernetif
tax	0:66300c77c6e9	113	* @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)
tax	0:66300c77c6e9	114	* @return ERR_OK if the packet could be sent
tax	0:66300c77c6e9	115	* an err_t value if the packet couldn't be sent
tax	0:66300c77c6e9	116	*
tax	0:66300c77c6e9	117	* @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to
tax	0:66300c77c6e9	118	* strange results. You might consider waiting for space in the DMA queue
tax	0:66300c77c6e9	119	* to become availale since the stack doesn't retry to send a packet
tax	0:66300c77c6e9	120	* dropped because of memory failure (except for the TCP timers).
tax	0:66300c77c6e9	121	*/
tax	0:66300c77c6e9	122
tax	0:66300c77c6e9	123	static err_t
tax	0:66300c77c6e9	124	low_level_output(struct netif netif, struct pbuf p)
tax	0:66300c77c6e9	125	{
tax	0:66300c77c6e9	126	struct ethernetif *ethernetif = netif->state;
tax	0:66300c77c6e9	127	struct pbuf *q;
tax	0:66300c77c6e9	128
tax	0:66300c77c6e9	129	initiate transfer();
tax	0:66300c77c6e9	130
tax	0:66300c77c6e9	131	#if ETH_PAD_SIZE
tax	0:66300c77c6e9	132	pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
tax	0:66300c77c6e9	133	#endif
tax	0:66300c77c6e9	134
tax	0:66300c77c6e9	135	for(q = p; q != NULL; q = q->next) {
tax	0:66300c77c6e9	136	/* Send the data from the pbuf to the interface, one pbuf at a
tax	0:66300c77c6e9	137	time. The size of the data in each pbuf is kept in the ->len
tax	0:66300c77c6e9	138	variable. */
tax	0:66300c77c6e9	139	send data from(q->payload, q->len);
tax	0:66300c77c6e9	140	}
tax	0:66300c77c6e9	141
tax	0:66300c77c6e9	142	signal that packet should be sent();
tax	0:66300c77c6e9	143
tax	0:66300c77c6e9	144	#if ETH_PAD_SIZE
tax	0:66300c77c6e9	145	pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
tax	0:66300c77c6e9	146	#endif
tax	0:66300c77c6e9	147
tax	0:66300c77c6e9	148	LINK_STATS_INC(link.xmit);
tax	0:66300c77c6e9	149
tax	0:66300c77c6e9	150	return ERR_OK;
tax	0:66300c77c6e9	151	}
tax	0:66300c77c6e9	152
tax	0:66300c77c6e9	153	/**
tax	0:66300c77c6e9	154	* Should allocate a pbuf and transfer the bytes of the incoming
tax	0:66300c77c6e9	155	* packet from the interface into the pbuf.
tax	0:66300c77c6e9	156	*
tax	0:66300c77c6e9	157	* @param netif the lwip network interface structure for this ethernetif
tax	0:66300c77c6e9	158	* @return a pbuf filled with the received packet (including MAC header)
tax	0:66300c77c6e9	159	* NULL on memory error
tax	0:66300c77c6e9	160	*/
tax	0:66300c77c6e9	161	static struct pbuf *
tax	0:66300c77c6e9	162	low_level_input(struct netif *netif)
tax	0:66300c77c6e9	163	{
tax	0:66300c77c6e9	164	struct ethernetif *ethernetif = netif->state;
tax	0:66300c77c6e9	165	struct pbuf p, q;
tax	0:66300c77c6e9	166	u16_t len;
tax	0:66300c77c6e9	167
tax	0:66300c77c6e9	168	/* Obtain the size of the packet and put it into the "len"
tax	0:66300c77c6e9	169	variable. */
tax	0:66300c77c6e9	170	len = ;
tax	0:66300c77c6e9	171
tax	0:66300c77c6e9	172	#if ETH_PAD_SIZE
tax	0:66300c77c6e9	173	len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
tax	0:66300c77c6e9	174	#endif
tax	0:66300c77c6e9	175
tax	0:66300c77c6e9	176	/* We allocate a pbuf chain of pbufs from the pool. */
tax	0:66300c77c6e9	177	p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
tax	0:66300c77c6e9	178
tax	0:66300c77c6e9	179	if (p != NULL) {
tax	0:66300c77c6e9	180
tax	0:66300c77c6e9	181	#if ETH_PAD_SIZE
tax	0:66300c77c6e9	182	pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
tax	0:66300c77c6e9	183	#endif
tax	0:66300c77c6e9	184
tax	0:66300c77c6e9	185	/* We iterate over the pbuf chain until we have read the entire
tax	0:66300c77c6e9	186	* packet into the pbuf. */
tax	0:66300c77c6e9	187	for(q = p; q != NULL; q = q->next) {
tax	0:66300c77c6e9	188	/* Read enough bytes to fill this pbuf in the chain. The
tax	0:66300c77c6e9	189	* available data in the pbuf is given by the q->len
tax	0:66300c77c6e9	190	* variable.
tax	0:66300c77c6e9	191	* This does not necessarily have to be a memcpy, you can also preallocate
tax	0:66300c77c6e9	192	* pbufs for a DMA-enabled MAC and after receiving truncate it to the
tax	0:66300c77c6e9	193	* actually received size. In this case, ensure the tot_len member of the
tax	0:66300c77c6e9	194	* pbuf is the sum of the chained pbuf len members.
tax	0:66300c77c6e9	195	*/
tax	0:66300c77c6e9	196	read data into(q->payload, q->len);
tax	0:66300c77c6e9	197	}
tax	0:66300c77c6e9	198	acknowledge that packet has been read();
tax	0:66300c77c6e9	199
tax	0:66300c77c6e9	200	#if ETH_PAD_SIZE
tax	0:66300c77c6e9	201	pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
tax	0:66300c77c6e9	202	#endif
tax	0:66300c77c6e9	203
tax	0:66300c77c6e9	204	LINK_STATS_INC(link.recv);
tax	0:66300c77c6e9	205	} else {
tax	0:66300c77c6e9	206	drop packet();
tax	0:66300c77c6e9	207	LINK_STATS_INC(link.memerr);
tax	0:66300c77c6e9	208	LINK_STATS_INC(link.drop);
tax	0:66300c77c6e9	209	}
tax	0:66300c77c6e9	210
tax	0:66300c77c6e9	211	return p;
tax	0:66300c77c6e9	212	}
tax	0:66300c77c6e9	213
tax	0:66300c77c6e9	214	/**
tax	0:66300c77c6e9	215	* This function should be called when a packet is ready to be read
tax	0:66300c77c6e9	216	* from the interface. It uses the function low_level_input() that
tax	0:66300c77c6e9	217	* should handle the actual reception of bytes from the network
tax	0:66300c77c6e9	218	* interface. Then the type of the received packet is determined and
tax	0:66300c77c6e9	219	* the appropriate input function is called.
tax	0:66300c77c6e9	220	*
tax	0:66300c77c6e9	221	* @param netif the lwip network interface structure for this ethernetif
tax	0:66300c77c6e9	222	*/
tax	0:66300c77c6e9	223	static void
tax	0:66300c77c6e9	224	ethernetif_input(struct netif *netif)
tax	0:66300c77c6e9	225	{
tax	0:66300c77c6e9	226	struct ethernetif *ethernetif;
tax	0:66300c77c6e9	227	struct eth_hdr *ethhdr;
tax	0:66300c77c6e9	228	struct pbuf *p;
tax	0:66300c77c6e9	229
tax	0:66300c77c6e9	230	ethernetif = netif->state;
tax	0:66300c77c6e9	231
tax	0:66300c77c6e9	232	/* move received packet into a new pbuf */
tax	0:66300c77c6e9	233	p = low_level_input(netif);
tax	0:66300c77c6e9	234	/* no packet could be read, silently ignore this */
tax	0:66300c77c6e9	235	if (p == NULL) return;
tax	0:66300c77c6e9	236	/* points to packet payload, which starts with an Ethernet header */
tax	0:66300c77c6e9	237	ethhdr = p->payload;
tax	0:66300c77c6e9	238
tax	0:66300c77c6e9	239	switch (htons(ethhdr->type)) {
tax	0:66300c77c6e9	240	/* IP or ARP packet? */
tax	0:66300c77c6e9	241	case ETHTYPE_IP:
tax	0:66300c77c6e9	242	case ETHTYPE_ARP:
tax	0:66300c77c6e9	243	#if PPPOE_SUPPORT
tax	0:66300c77c6e9	244	/* PPPoE packet? */
tax	0:66300c77c6e9	245	case ETHTYPE_PPPOEDISC:
tax	0:66300c77c6e9	246	case ETHTYPE_PPPOE:
tax	0:66300c77c6e9	247	#endif /* PPPOE_SUPPORT */
tax	0:66300c77c6e9	248	/* full packet send to tcpip_thread to process */
tax	0:66300c77c6e9	249	if (netif->input(p, netif)!=ERR_OK)
tax	0:66300c77c6e9	250	{ LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
tax	0:66300c77c6e9	251	pbuf_free(p);
tax	0:66300c77c6e9	252	p = NULL;
tax	0:66300c77c6e9	253	}
tax	0:66300c77c6e9	254	break;
tax	0:66300c77c6e9	255
tax	0:66300c77c6e9	256	default:
tax	0:66300c77c6e9	257	pbuf_free(p);
tax	0:66300c77c6e9	258	p = NULL;
tax	0:66300c77c6e9	259	break;
tax	0:66300c77c6e9	260	}
tax	0:66300c77c6e9	261	}
tax	0:66300c77c6e9	262
tax	0:66300c77c6e9	263	/**
tax	0:66300c77c6e9	264	* Should be called at the beginning of the program to set up the
tax	0:66300c77c6e9	265	* network interface. It calls the function low_level_init() to do the
tax	0:66300c77c6e9	266	* actual setup of the hardware.
tax	0:66300c77c6e9	267	*
tax	0:66300c77c6e9	268	* This function should be passed as a parameter to netif_add().
tax	0:66300c77c6e9	269	*
tax	0:66300c77c6e9	270	* @param netif the lwip network interface structure for this ethernetif
tax	0:66300c77c6e9	271	* @return ERR_OK if the loopif is initialized
tax	0:66300c77c6e9	272	* ERR_MEM if private data couldn't be allocated
tax	0:66300c77c6e9	273	* any other err_t on error
tax	0:66300c77c6e9	274	*/
tax	0:66300c77c6e9	275	err_t
tax	0:66300c77c6e9	276	ethernetif_init(struct netif *netif)
tax	0:66300c77c6e9	277	{
tax	0:66300c77c6e9	278	struct ethernetif *ethernetif;
tax	0:66300c77c6e9	279
tax	0:66300c77c6e9	280	LWIP_ASSERT("netif != NULL", (netif != NULL));
tax	0:66300c77c6e9	281
tax	0:66300c77c6e9	282	ethernetif = mem_malloc(sizeof(struct ethernetif));
tax	0:66300c77c6e9	283	if (ethernetif == NULL) {
tax	0:66300c77c6e9	284	LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_init: out of memory\n"));
tax	0:66300c77c6e9	285	return ERR_MEM;
tax	0:66300c77c6e9	286	}
tax	0:66300c77c6e9	287
tax	0:66300c77c6e9	288	#if LWIP_NETIF_HOSTNAME
tax	0:66300c77c6e9	289	/* Initialize interface hostname */
tax	0:66300c77c6e9	290	netif->hostname = "lwip";
tax	0:66300c77c6e9	291	#endif /* LWIP_NETIF_HOSTNAME */
tax	0:66300c77c6e9	292
tax	0:66300c77c6e9	293	/*
tax	0:66300c77c6e9	294	* Initialize the snmp variables and counters inside the struct netif.
tax	0:66300c77c6e9	295	* The last argument should be replaced with your link speed, in units
tax	0:66300c77c6e9	296	* of bits per second.
tax	0:66300c77c6e9	297	*/
tax	0:66300c77c6e9	298	NETIF_INIT_SNMP(netif, snmp_ifType_ethernet_csmacd, LINK_SPEED_OF_YOUR_NETIF_IN_BPS);
tax	0:66300c77c6e9	299
tax	0:66300c77c6e9	300	netif->state = ethernetif;
tax	0:66300c77c6e9	301	netif->name[0] = IFNAME0;
tax	0:66300c77c6e9	302	netif->name[1] = IFNAME1;
tax	0:66300c77c6e9	303	/* We directly use etharp_output() here to save a function call.
tax	0:66300c77c6e9	304	* You can instead declare your own function an call etharp_output()
tax	0:66300c77c6e9	305	* from it if you have to do some checks before sending (e.g. if link
tax	0:66300c77c6e9	306	* is available...) */
tax	0:66300c77c6e9	307	netif->output = etharp_output;
tax	0:66300c77c6e9	308	netif->linkoutput = low_level_output;
tax	0:66300c77c6e9	309
tax	0:66300c77c6e9	310	ethernetif->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);
tax	0:66300c77c6e9	311
tax	0:66300c77c6e9	312	/* initialize the hardware */
tax	0:66300c77c6e9	313	low_level_init(netif);
tax	0:66300c77c6e9	314
tax	0:66300c77c6e9	315	return ERR_OK;
tax	0:66300c77c6e9	316	}
tax	0:66300c77c6e9	317
tax	0:66300c77c6e9	318	#endif /* 0 */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	29 Mar 2011
Imports:	16
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	2

lwip/netif/ethernetif.c@0:66300c77c6e9, 2011-03-29 (annotated)

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