Donatien Garnier / lwip_ppp_ethernet

LwIP with PPP & Ethernet integration

Dependents:   NetworkingCoreLib

This is the mbed port of the LwIP stack: http://savannah.nongnu.org/projects/lwip/

It includes contributed content from NXP's port for LPCxxxx devices: http://www.lpcware.com/content/project/lightweight-ip-lwip-networking-stack

Licence

LwIP is licenced under the BSD licence: 

Copyright (c) 2001-2004 Swedish Institute of Computer Science. 
All rights reserved. 
Redistribution and use in source and binary forms, with or without modification, 
are permitted provided that the following conditions are met: 
1. Redistributions of source code must retain the above copyright notice, 
this list of conditions and the following disclaimer. 
2. Redistributions in binary form must reproduce the above copyright notice, 
this list of conditions and the following disclaimer in the documentation 
and/or other materials provided with the distribution. 
3. The name of the author may not be used to endorse or promote products 
derived from this software without specific prior written permission. 
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
OF SUCH DAMAGE.

src/netif/slipif.c@0:8e01dca41002, 2012-05-24 (annotated)

Committer:
donatien
Date:
Thu May 24 15:53:48 2012 +0000
Revision:
0:8e01dca41002
Merge with Emilio's LwIp

Who changed what in which revision?

UserRevisionLine numberNew contents of line
donatien 0:8e01dca41002 1 /**
donatien 0:8e01dca41002 2 * @file
donatien 0:8e01dca41002 3 * SLIP Interface
donatien 0:8e01dca41002 4 *
donatien 0:8e01dca41002 5 */
donatien 0:8e01dca41002 6
donatien 0:8e01dca41002 7 /*
donatien 0:8e01dca41002 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
donatien 0:8e01dca41002 9 * All rights reserved.
donatien 0:8e01dca41002 10 *
donatien 0:8e01dca41002 11 * Redistribution and use in source and binary forms, with or without
donatien 0:8e01dca41002 12 * modification, are permitted provided that the following conditions
donatien 0:8e01dca41002 13 * are met:
donatien 0:8e01dca41002 14 * 1. Redistributions of source code must retain the above copyright
donatien 0:8e01dca41002 15 * notice, this list of conditions and the following disclaimer.
donatien 0:8e01dca41002 16 * 2. Redistributions in binary form must reproduce the above copyright
donatien 0:8e01dca41002 17 * notice, this list of conditions and the following disclaimer in the
donatien 0:8e01dca41002 18 * documentation and/or other materials provided with the distribution.
donatien 0:8e01dca41002 19 * 3. Neither the name of the Institute nor the names of its contributors
donatien 0:8e01dca41002 20 * may be used to endorse or promote products derived from this software
donatien 0:8e01dca41002 21 * without specific prior written permission.
donatien 0:8e01dca41002 22 *
donatien 0:8e01dca41002 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
donatien 0:8e01dca41002 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
donatien 0:8e01dca41002 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
donatien 0:8e01dca41002 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
donatien 0:8e01dca41002 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
donatien 0:8e01dca41002 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
donatien 0:8e01dca41002 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
donatien 0:8e01dca41002 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
donatien 0:8e01dca41002 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
donatien 0:8e01dca41002 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
donatien 0:8e01dca41002 33 * SUCH DAMAGE.
donatien 0:8e01dca41002 34 *
donatien 0:8e01dca41002 35 * This file is built upon the file: src/arch/rtxc/netif/sioslip.c
donatien 0:8e01dca41002 36 *
donatien 0:8e01dca41002 37 * Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com>
donatien 0:8e01dca41002 38 */
donatien 0:8e01dca41002 39
donatien 0:8e01dca41002 40 /*
donatien 0:8e01dca41002 41 * This is an arch independent SLIP netif. The specific serial hooks must be
donatien 0:8e01dca41002 42 * provided by another file. They are sio_open, sio_read/sio_tryread and sio_send
donatien 0:8e01dca41002 43 */
donatien 0:8e01dca41002 44
donatien 0:8e01dca41002 45 #include "netif/slipif.h"
donatien 0:8e01dca41002 46 #include "lwip/opt.h"
donatien 0:8e01dca41002 47
donatien 0:8e01dca41002 48 #if LWIP_HAVE_SLIPIF
donatien 0:8e01dca41002 49
donatien 0:8e01dca41002 50 #include "lwip/def.h"
donatien 0:8e01dca41002 51 #include "lwip/pbuf.h"
donatien 0:8e01dca41002 52 #include "lwip/sys.h"
donatien 0:8e01dca41002 53 #include "lwip/stats.h"
donatien 0:8e01dca41002 54 #include "lwip/snmp.h"
donatien 0:8e01dca41002 55 #include "lwip/sio.h"
donatien 0:8e01dca41002 56
donatien 0:8e01dca41002 57 #define SLIP_BLOCK 1
donatien 0:8e01dca41002 58 #define SLIP_DONTBLOCK 0
donatien 0:8e01dca41002 59
donatien 0:8e01dca41002 60 #define SLIP_END 0300 /* 0xC0 */
donatien 0:8e01dca41002 61 #define SLIP_ESC 0333 /* 0xDB */
donatien 0:8e01dca41002 62 #define SLIP_ESC_END 0334 /* 0xDC */
donatien 0:8e01dca41002 63 #define SLIP_ESC_ESC 0335 /* 0xDD */
donatien 0:8e01dca41002 64
donatien 0:8e01dca41002 65 #define SLIP_MAX_SIZE 1500
donatien 0:8e01dca41002 66
donatien 0:8e01dca41002 67 enum slipif_recv_state {
donatien 0:8e01dca41002 68 SLIP_RECV_NORMAL,
donatien 0:8e01dca41002 69 SLIP_RECV_ESCAPE,
donatien 0:8e01dca41002 70 };
donatien 0:8e01dca41002 71
donatien 0:8e01dca41002 72 struct slipif_priv {
donatien 0:8e01dca41002 73 sio_fd_t sd;
donatien 0:8e01dca41002 74 /* q is the whole pbuf chain for a packet, p is the current pbuf in the chain */
donatien 0:8e01dca41002 75 struct pbuf *p, *q;
donatien 0:8e01dca41002 76 enum slipif_recv_state state;
donatien 0:8e01dca41002 77 u16_t i, recved;
donatien 0:8e01dca41002 78 };
donatien 0:8e01dca41002 79
donatien 0:8e01dca41002 80 /**
donatien 0:8e01dca41002 81 * Send a pbuf doing the necessary SLIP encapsulation
donatien 0:8e01dca41002 82 *
donatien 0:8e01dca41002 83 * Uses the serial layer's sio_send()
donatien 0:8e01dca41002 84 *
donatien 0:8e01dca41002 85 * @param netif the lwip network interface structure for this slipif
donatien 0:8e01dca41002 86 * @param p the pbuf chaing packet to send
donatien 0:8e01dca41002 87 * @param ipaddr the ip address to send the packet to (not used for slipif)
donatien 0:8e01dca41002 88 * @return always returns ERR_OK since the serial layer does not provide return values
donatien 0:8e01dca41002 89 */
donatien 0:8e01dca41002 90 err_t
donatien 0:8e01dca41002 91 slipif_output(struct netif *netif, struct pbuf *p, ip_addr_t *ipaddr)
donatien 0:8e01dca41002 92 {
donatien 0:8e01dca41002 93 struct slipif_priv *priv;
donatien 0:8e01dca41002 94 struct pbuf *q;
donatien 0:8e01dca41002 95 u16_t i;
donatien 0:8e01dca41002 96 u8_t c;
donatien 0:8e01dca41002 97
donatien 0:8e01dca41002 98 LWIP_ASSERT("netif != NULL", (netif != NULL));
donatien 0:8e01dca41002 99 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
donatien 0:8e01dca41002 100 LWIP_ASSERT("p != NULL", (p != NULL));
donatien 0:8e01dca41002 101
donatien 0:8e01dca41002 102 LWIP_UNUSED_ARG(ipaddr);
donatien 0:8e01dca41002 103
donatien 0:8e01dca41002 104 priv = netif->state;
donatien 0:8e01dca41002 105
donatien 0:8e01dca41002 106 /* Send pbuf out on the serial I/O device. */
donatien 0:8e01dca41002 107 sio_send(SLIP_END, priv->sd);
donatien 0:8e01dca41002 108
donatien 0:8e01dca41002 109 for (q = p; q != NULL; q = q->next) {
donatien 0:8e01dca41002 110 for (i = 0; i < q->len; i++) {
donatien 0:8e01dca41002 111 c = ((u8_t *)q->payload)[i];
donatien 0:8e01dca41002 112 switch (c) {
donatien 0:8e01dca41002 113 case SLIP_END:
donatien 0:8e01dca41002 114 sio_send(SLIP_ESC, priv->sd);
donatien 0:8e01dca41002 115 sio_send(SLIP_ESC_END, priv->sd);
donatien 0:8e01dca41002 116 break;
donatien 0:8e01dca41002 117 case SLIP_ESC:
donatien 0:8e01dca41002 118 sio_send(SLIP_ESC, priv->sd);
donatien 0:8e01dca41002 119 sio_send(SLIP_ESC_ESC, priv->sd);
donatien 0:8e01dca41002 120 break;
donatien 0:8e01dca41002 121 default:
donatien 0:8e01dca41002 122 sio_send(c, priv->sd);
donatien 0:8e01dca41002 123 break;
donatien 0:8e01dca41002 124 }
donatien 0:8e01dca41002 125 }
donatien 0:8e01dca41002 126 }
donatien 0:8e01dca41002 127 sio_send(SLIP_END, priv->sd);
donatien 0:8e01dca41002 128 return ERR_OK;
donatien 0:8e01dca41002 129 }
donatien 0:8e01dca41002 130
donatien 0:8e01dca41002 131 /**
donatien 0:8e01dca41002 132 * Static function for easy use of blockig or non-blocking
donatien 0:8e01dca41002 133 * sio_read
donatien 0:8e01dca41002 134 *
donatien 0:8e01dca41002 135 * @param fd serial device handle
donatien 0:8e01dca41002 136 * @param data pointer to data buffer for receiving
donatien 0:8e01dca41002 137 * @param len maximum length (in bytes) of data to receive
donatien 0:8e01dca41002 138 * @param block if 1, call sio_read; if 0, call sio_tryread
donatien 0:8e01dca41002 139 * @return return value of sio_read of sio_tryread
donatien 0:8e01dca41002 140 */
donatien 0:8e01dca41002 141 static u32_t
donatien 0:8e01dca41002 142 slip_sio_read(sio_fd_t fd, u8_t* data, u32_t len, u8_t block)
donatien 0:8e01dca41002 143 {
donatien 0:8e01dca41002 144 if (block) {
donatien 0:8e01dca41002 145 return sio_read(fd, data, len);
donatien 0:8e01dca41002 146 } else {
donatien 0:8e01dca41002 147 return sio_tryread(fd, data, len);
donatien 0:8e01dca41002 148 }
donatien 0:8e01dca41002 149 }
donatien 0:8e01dca41002 150
donatien 0:8e01dca41002 151 /**
donatien 0:8e01dca41002 152 * Handle the incoming SLIP stream character by character
donatien 0:8e01dca41002 153 *
donatien 0:8e01dca41002 154 * Poll the serial layer by calling sio_read() or sio_tryread().
donatien 0:8e01dca41002 155 *
donatien 0:8e01dca41002 156 * @param netif the lwip network interface structure for this slipif
donatien 0:8e01dca41002 157 * @param block if 1, block until data is received; if 0, return when all data
donatien 0:8e01dca41002 158 * from the buffer is received (multiple calls to this function will
donatien 0:8e01dca41002 159 * return a complete packet, NULL is returned before - used for polling)
donatien 0:8e01dca41002 160 * @return The IP packet when SLIP_END is received
donatien 0:8e01dca41002 161 */
donatien 0:8e01dca41002 162 static struct pbuf *
donatien 0:8e01dca41002 163 slipif_input(struct netif *netif, u8_t block)
donatien 0:8e01dca41002 164 {
donatien 0:8e01dca41002 165 struct slipif_priv *priv;
donatien 0:8e01dca41002 166 u8_t c;
donatien 0:8e01dca41002 167 struct pbuf *t;
donatien 0:8e01dca41002 168
donatien 0:8e01dca41002 169 LWIP_ASSERT("netif != NULL", (netif != NULL));
donatien 0:8e01dca41002 170 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
donatien 0:8e01dca41002 171
donatien 0:8e01dca41002 172 priv = netif->state;
donatien 0:8e01dca41002 173
donatien 0:8e01dca41002 174 while (slip_sio_read(priv->sd, &c, 1, block) > 0) {
donatien 0:8e01dca41002 175 switch (priv->state) {
donatien 0:8e01dca41002 176 case SLIP_RECV_NORMAL:
donatien 0:8e01dca41002 177 switch (c) {
donatien 0:8e01dca41002 178 case SLIP_END:
donatien 0:8e01dca41002 179 if (priv->recved > 0) {
donatien 0:8e01dca41002 180 /* Received whole packet. */
donatien 0:8e01dca41002 181 /* Trim the pbuf to the size of the received packet. */
donatien 0:8e01dca41002 182 pbuf_realloc(priv->q, priv->recved);
donatien 0:8e01dca41002 183
donatien 0:8e01dca41002 184 LINK_STATS_INC(link.recv);
donatien 0:8e01dca41002 185
donatien 0:8e01dca41002 186 LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet\n"));
donatien 0:8e01dca41002 187 t = priv->q;
donatien 0:8e01dca41002 188 priv->p = priv->q = NULL;
donatien 0:8e01dca41002 189 priv->i = priv->recved = 0;
donatien 0:8e01dca41002 190 return t;
donatien 0:8e01dca41002 191 }
donatien 0:8e01dca41002 192 continue;
donatien 0:8e01dca41002 193 case SLIP_ESC:
donatien 0:8e01dca41002 194 priv->state = SLIP_RECV_ESCAPE;
donatien 0:8e01dca41002 195 continue;
donatien 0:8e01dca41002 196 }
donatien 0:8e01dca41002 197 break;
donatien 0:8e01dca41002 198 case SLIP_RECV_ESCAPE:
donatien 0:8e01dca41002 199 switch (c) {
donatien 0:8e01dca41002 200 case SLIP_ESC_END:
donatien 0:8e01dca41002 201 c = SLIP_END;
donatien 0:8e01dca41002 202 break;
donatien 0:8e01dca41002 203 case SLIP_ESC_ESC:
donatien 0:8e01dca41002 204 c = SLIP_ESC;
donatien 0:8e01dca41002 205 break;
donatien 0:8e01dca41002 206 }
donatien 0:8e01dca41002 207 priv->state = SLIP_RECV_NORMAL;
donatien 0:8e01dca41002 208 /* FALLTHROUGH */
donatien 0:8e01dca41002 209 }
donatien 0:8e01dca41002 210
donatien 0:8e01dca41002 211 /* byte received, packet not yet completely received */
donatien 0:8e01dca41002 212 if (priv->p == NULL) {
donatien 0:8e01dca41002 213 /* allocate a new pbuf */
donatien 0:8e01dca41002 214 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
donatien 0:8e01dca41002 215 priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN), PBUF_POOL);
donatien 0:8e01dca41002 216
donatien 0:8e01dca41002 217 if (priv->p == NULL) {
donatien 0:8e01dca41002 218 LINK_STATS_INC(link.drop);
donatien 0:8e01dca41002 219 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
donatien 0:8e01dca41002 220 /* don't process any further since we got no pbuf to receive to */
donatien 0:8e01dca41002 221 break;
donatien 0:8e01dca41002 222 }
donatien 0:8e01dca41002 223
donatien 0:8e01dca41002 224 if (priv->q != NULL) {
donatien 0:8e01dca41002 225 /* 'chain' the pbuf to the existing chain */
donatien 0:8e01dca41002 226 pbuf_cat(priv->q, priv->p);
donatien 0:8e01dca41002 227 } else {
donatien 0:8e01dca41002 228 /* p is the first pbuf in the chain */
donatien 0:8e01dca41002 229 priv->q = priv->p;
donatien 0:8e01dca41002 230 }
donatien 0:8e01dca41002 231 }
donatien 0:8e01dca41002 232
donatien 0:8e01dca41002 233 /* this automatically drops bytes if > SLIP_MAX_SIZE */
donatien 0:8e01dca41002 234 if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
donatien 0:8e01dca41002 235 ((u8_t *)priv->p->payload)[priv->i] = c;
donatien 0:8e01dca41002 236 priv->recved++;
donatien 0:8e01dca41002 237 priv->i++;
donatien 0:8e01dca41002 238 if (priv->i >= priv->p->len) {
donatien 0:8e01dca41002 239 /* on to the next pbuf */
donatien 0:8e01dca41002 240 priv->i = 0;
donatien 0:8e01dca41002 241 if (priv->p->next != NULL && priv->p->next->len > 0) {
donatien 0:8e01dca41002 242 /* p is a chain, on to the next in the chain */
donatien 0:8e01dca41002 243 priv->p = priv->p->next;
donatien 0:8e01dca41002 244 } else {
donatien 0:8e01dca41002 245 /* p is a single pbuf, set it to NULL so next time a new
donatien 0:8e01dca41002 246 * pbuf is allocated */
donatien 0:8e01dca41002 247 priv->p = NULL;
donatien 0:8e01dca41002 248 }
donatien 0:8e01dca41002 249 }
donatien 0:8e01dca41002 250 }
donatien 0:8e01dca41002 251 }
donatien 0:8e01dca41002 252
donatien 0:8e01dca41002 253 return NULL;
donatien 0:8e01dca41002 254 }
donatien 0:8e01dca41002 255
donatien 0:8e01dca41002 256 #if !NO_SYS
donatien 0:8e01dca41002 257 /**
donatien 0:8e01dca41002 258 * The SLIP input thread.
donatien 0:8e01dca41002 259 *
donatien 0:8e01dca41002 260 * Feed the IP layer with incoming packets
donatien 0:8e01dca41002 261 *
donatien 0:8e01dca41002 262 * @param nf the lwip network interface structure for this slipif
donatien 0:8e01dca41002 263 */
donatien 0:8e01dca41002 264 static void
donatien 0:8e01dca41002 265 slipif_loop_thread(void *nf)
donatien 0:8e01dca41002 266 {
donatien 0:8e01dca41002 267 struct pbuf *p;
donatien 0:8e01dca41002 268 struct netif *netif = (struct netif *)nf;
donatien 0:8e01dca41002 269
donatien 0:8e01dca41002 270 while (1) {
donatien 0:8e01dca41002 271 p = slipif_input(netif, SLIP_BLOCK);
donatien 0:8e01dca41002 272 if (p != NULL) {
donatien 0:8e01dca41002 273 if (netif->input(p, netif) != ERR_OK) {
donatien 0:8e01dca41002 274 pbuf_free(p);
donatien 0:8e01dca41002 275 p = NULL;
donatien 0:8e01dca41002 276 }
donatien 0:8e01dca41002 277 }
donatien 0:8e01dca41002 278 }
donatien 0:8e01dca41002 279 }
donatien 0:8e01dca41002 280 #endif /* !NO_SYS */
donatien 0:8e01dca41002 281
donatien 0:8e01dca41002 282 /**
donatien 0:8e01dca41002 283 * SLIP netif initialization
donatien 0:8e01dca41002 284 *
donatien 0:8e01dca41002 285 * Call the arch specific sio_open and remember
donatien 0:8e01dca41002 286 * the opened device in the state field of the netif.
donatien 0:8e01dca41002 287 *
donatien 0:8e01dca41002 288 * @param netif the lwip network interface structure for this slipif
donatien 0:8e01dca41002 289 * @return ERR_OK if serial line could be opened,
donatien 0:8e01dca41002 290 * ERR_MEM if no memory could be allocated,
donatien 0:8e01dca41002 291 * ERR_IF is serial line couldn't be opened
donatien 0:8e01dca41002 292 *
donatien 0:8e01dca41002 293 * @note netif->num must contain the number of the serial port to open
donatien 0:8e01dca41002 294 * (0 by default)
donatien 0:8e01dca41002 295 */
donatien 0:8e01dca41002 296 err_t
donatien 0:8e01dca41002 297 slipif_init(struct netif *netif)
donatien 0:8e01dca41002 298 {
donatien 0:8e01dca41002 299 struct slipif_priv *priv;
donatien 0:8e01dca41002 300
donatien 0:8e01dca41002 301 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)netif->num));
donatien 0:8e01dca41002 302
donatien 0:8e01dca41002 303 /* Allocate private data */
donatien 0:8e01dca41002 304 priv = mem_malloc(sizeof(struct slipif_priv));
donatien 0:8e01dca41002 305 if (!priv) {
donatien 0:8e01dca41002 306 return ERR_MEM;
donatien 0:8e01dca41002 307 }
donatien 0:8e01dca41002 308
donatien 0:8e01dca41002 309 netif->name[0] = 's';
donatien 0:8e01dca41002 310 netif->name[1] = 'l';
donatien 0:8e01dca41002 311 netif->output = slipif_output;
donatien 0:8e01dca41002 312 netif->mtu = SLIP_MAX_SIZE;
donatien 0:8e01dca41002 313 netif->flags |= NETIF_FLAG_POINTTOPOINT;
donatien 0:8e01dca41002 314
donatien 0:8e01dca41002 315 /* Try to open the serial port (netif->num contains the port number). */
donatien 0:8e01dca41002 316 priv->sd = sio_open(netif->num);
donatien 0:8e01dca41002 317 if (!priv->sd) {
donatien 0:8e01dca41002 318 /* Opening the serial port failed. */
donatien 0:8e01dca41002 319 mem_free(priv);
donatien 0:8e01dca41002 320 return ERR_IF;
donatien 0:8e01dca41002 321 }
donatien 0:8e01dca41002 322
donatien 0:8e01dca41002 323 /* Initialize private data */
donatien 0:8e01dca41002 324 priv->p = NULL;
donatien 0:8e01dca41002 325 priv->q = NULL;
donatien 0:8e01dca41002 326 priv->state = SLIP_RECV_NORMAL;
donatien 0:8e01dca41002 327 priv->i = 0;
donatien 0:8e01dca41002 328 priv->recved = 0;
donatien 0:8e01dca41002 329
donatien 0:8e01dca41002 330 netif->state = priv;
donatien 0:8e01dca41002 331
donatien 0:8e01dca41002 332 /* initialize the snmp variables and counters inside the struct netif
donatien 0:8e01dca41002 333 * ifSpeed: no assumption can be made without knowing more about the
donatien 0:8e01dca41002 334 * serial line!
donatien 0:8e01dca41002 335 */
donatien 0:8e01dca41002 336 NETIF_INIT_SNMP(netif, snmp_ifType_slip, 0);
donatien 0:8e01dca41002 337
donatien 0:8e01dca41002 338 /* Create a thread to poll the serial line. */
donatien 0:8e01dca41002 339 sys_thread_new(SLIPIF_THREAD_NAME, slipif_loop_thread, netif,
donatien 0:8e01dca41002 340 SLIPIF_THREAD_STACKSIZE, SLIPIF_THREAD_PRIO);
donatien 0:8e01dca41002 341 return ERR_OK;
donatien 0:8e01dca41002 342 }
donatien 0:8e01dca41002 343
donatien 0:8e01dca41002 344 /**
donatien 0:8e01dca41002 345 * Polls the serial device and feeds the IP layer with incoming packets.
donatien 0:8e01dca41002 346 *
donatien 0:8e01dca41002 347 * @param netif The lwip network interface structure for this slipif
donatien 0:8e01dca41002 348 */
donatien 0:8e01dca41002 349 void
donatien 0:8e01dca41002 350 slipif_poll(struct netif *netif)
donatien 0:8e01dca41002 351 {
donatien 0:8e01dca41002 352 struct pbuf *p;
donatien 0:8e01dca41002 353 struct slipif_priv *priv;
donatien 0:8e01dca41002 354
donatien 0:8e01dca41002 355 LWIP_ASSERT("netif != NULL", (netif != NULL));
donatien 0:8e01dca41002 356 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
donatien 0:8e01dca41002 357
donatien 0:8e01dca41002 358 priv = netif->state;
donatien 0:8e01dca41002 359
donatien 0:8e01dca41002 360 while ((p = slipif_input(netif, SLIP_DONTBLOCK)) != NULL) {
donatien 0:8e01dca41002 361 if (netif->input(p, netif) != ERR_OK) {
donatien 0:8e01dca41002 362 pbuf_free(p);
donatien 0:8e01dca41002 363 }
donatien 0:8e01dca41002 364 }
donatien 0:8e01dca41002 365 }
donatien 0:8e01dca41002 366
donatien 0:8e01dca41002 367 #endif /* LWIP_HAVE_SLIPIF */