Pascal Nysten / lwip

Adapted to Lora Semtech + Nucleo

Dependencies:   DebugLib

Dependents:   LoRaWAN-lmic-app LoRaWAN-lmic-app LoRaWAN-test-10secs LoRaPersonalizedDeviceForEverynet ... more

Fork of lwip_ppp_ethernet by Donatien Garnier

src/netif/slipif.c@3:a9e6ba815945, 2015-11-20 (annotated)

Committer:
pnysten
Date:
Fri Nov 20 12:30:58 2015 +0000
Revision:
3:a9e6ba815945
Parent:
0:8e01dca41002 
Adapted to Nucleo, LoRa Semtech

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 */