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lwip/netif/slipif.c@0:d7bd7384a37c, 2016-12-07 (annotated)

Committer:
grzemich
Date:
Wed Dec 07 23:47:50 2016 +0000
Revision:
0:d7bd7384a37c
dgd

Who changed what in which revision?

UserRevisionLine numberNew contents of line
grzemich 0:d7bd7384a37c 1 /**
grzemich 0:d7bd7384a37c 2 * @file
grzemich 0:d7bd7384a37c 3 * SLIP Interface
grzemich 0:d7bd7384a37c 4 *
grzemich 0:d7bd7384a37c 5 */
grzemich 0:d7bd7384a37c 6
grzemich 0:d7bd7384a37c 7 /*
grzemich 0:d7bd7384a37c 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
grzemich 0:d7bd7384a37c 9 * All rights reserved.
grzemich 0:d7bd7384a37c 10 *
grzemich 0:d7bd7384a37c 11 * Redistribution and use in source and binary forms, with or without
grzemich 0:d7bd7384a37c 12 * modification, are permitted provided that the following conditions
grzemich 0:d7bd7384a37c 13 * are met:
grzemich 0:d7bd7384a37c 14 * 1. Redistributions of source code must retain the above copyright
grzemich 0:d7bd7384a37c 15 * notice, this list of conditions and the following disclaimer.
grzemich 0:d7bd7384a37c 16 * 2. Redistributions in binary form must reproduce the above copyright
grzemich 0:d7bd7384a37c 17 * notice, this list of conditions and the following disclaimer in the
grzemich 0:d7bd7384a37c 18 * documentation and/or other materials provided with the distribution.
grzemich 0:d7bd7384a37c 19 * 3. Neither the name of the Institute nor the names of its contributors
grzemich 0:d7bd7384a37c 20 * may be used to endorse or promote products derived from this software
grzemich 0:d7bd7384a37c 21 * without specific prior written permission.
grzemich 0:d7bd7384a37c 22 *
grzemich 0:d7bd7384a37c 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
grzemich 0:d7bd7384a37c 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
grzemich 0:d7bd7384a37c 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
grzemich 0:d7bd7384a37c 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
grzemich 0:d7bd7384a37c 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
grzemich 0:d7bd7384a37c 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
grzemich 0:d7bd7384a37c 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
grzemich 0:d7bd7384a37c 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
grzemich 0:d7bd7384a37c 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
grzemich 0:d7bd7384a37c 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
grzemich 0:d7bd7384a37c 33 * SUCH DAMAGE.
grzemich 0:d7bd7384a37c 34 *
grzemich 0:d7bd7384a37c 35 * This file is built upon the file: src/arch/rtxc/netif/sioslip.c
grzemich 0:d7bd7384a37c 36 *
grzemich 0:d7bd7384a37c 37 * Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com>
grzemich 0:d7bd7384a37c 38 */
grzemich 0:d7bd7384a37c 39
grzemich 0:d7bd7384a37c 40 /*
grzemich 0:d7bd7384a37c 41 * This is an arch independent SLIP netif. The specific serial hooks must be
grzemich 0:d7bd7384a37c 42 * provided by another file. They are sio_open, sio_read/sio_tryread and sio_send
grzemich 0:d7bd7384a37c 43 */
grzemich 0:d7bd7384a37c 44
grzemich 0:d7bd7384a37c 45 #include "netif/slipif.h"
grzemich 0:d7bd7384a37c 46 #include "lwip/opt.h"
grzemich 0:d7bd7384a37c 47
grzemich 0:d7bd7384a37c 48 #if LWIP_HAVE_SLIPIF
grzemich 0:d7bd7384a37c 49
grzemich 0:d7bd7384a37c 50 #include "lwip/def.h"
grzemich 0:d7bd7384a37c 51 #include "lwip/pbuf.h"
grzemich 0:d7bd7384a37c 52 #include "lwip/sys.h"
grzemich 0:d7bd7384a37c 53 #include "lwip/stats.h"
grzemich 0:d7bd7384a37c 54 #include "lwip/snmp.h"
grzemich 0:d7bd7384a37c 55 #include "lwip/sio.h"
grzemich 0:d7bd7384a37c 56
grzemich 0:d7bd7384a37c 57 #define SLIP_BLOCK 1
grzemich 0:d7bd7384a37c 58 #define SLIP_DONTBLOCK 0
grzemich 0:d7bd7384a37c 59
grzemich 0:d7bd7384a37c 60 #define SLIP_END 0300 /* 0xC0 */
grzemich 0:d7bd7384a37c 61 #define SLIP_ESC 0333 /* 0xDB */
grzemich 0:d7bd7384a37c 62 #define SLIP_ESC_END 0334 /* 0xDC */
grzemich 0:d7bd7384a37c 63 #define SLIP_ESC_ESC 0335 /* 0xDD */
grzemich 0:d7bd7384a37c 64
grzemich 0:d7bd7384a37c 65 #define SLIP_MAX_SIZE 1500
grzemich 0:d7bd7384a37c 66
grzemich 0:d7bd7384a37c 67 enum slipif_recv_state {
grzemich 0:d7bd7384a37c 68 SLIP_RECV_NORMAL,
grzemich 0:d7bd7384a37c 69 SLIP_RECV_ESCAPE,
grzemich 0:d7bd7384a37c 70 };
grzemich 0:d7bd7384a37c 71
grzemich 0:d7bd7384a37c 72 struct slipif_priv {
grzemich 0:d7bd7384a37c 73 sio_fd_t sd;
grzemich 0:d7bd7384a37c 74 /* q is the whole pbuf chain for a packet, p is the current pbuf in the chain */
grzemich 0:d7bd7384a37c 75 struct pbuf *p, *q;
grzemich 0:d7bd7384a37c 76 enum slipif_recv_state state;
grzemich 0:d7bd7384a37c 77 u16_t i, recved;
grzemich 0:d7bd7384a37c 78 };
grzemich 0:d7bd7384a37c 79
grzemich 0:d7bd7384a37c 80 /**
grzemich 0:d7bd7384a37c 81 * Send a pbuf doing the necessary SLIP encapsulation
grzemich 0:d7bd7384a37c 82 *
grzemich 0:d7bd7384a37c 83 * Uses the serial layer's sio_send()
grzemich 0:d7bd7384a37c 84 *
grzemich 0:d7bd7384a37c 85 * @param netif the lwip network interface structure for this slipif
grzemich 0:d7bd7384a37c 86 * @param p the pbuf chaing packet to send
grzemich 0:d7bd7384a37c 87 * @param ipaddr the ip address to send the packet to (not used for slipif)
grzemich 0:d7bd7384a37c 88 * @return always returns ERR_OK since the serial layer does not provide return values
grzemich 0:d7bd7384a37c 89 */
grzemich 0:d7bd7384a37c 90 err_t
grzemich 0:d7bd7384a37c 91 slipif_output(struct netif *netif, struct pbuf *p, ip_addr_t *ipaddr)
grzemich 0:d7bd7384a37c 92 {
grzemich 0:d7bd7384a37c 93 struct slipif_priv *priv;
grzemich 0:d7bd7384a37c 94 struct pbuf *q;
grzemich 0:d7bd7384a37c 95 u16_t i;
grzemich 0:d7bd7384a37c 96 u8_t c;
grzemich 0:d7bd7384a37c 97
grzemich 0:d7bd7384a37c 98 LWIP_ASSERT("netif != NULL", (netif != NULL));
grzemich 0:d7bd7384a37c 99 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
grzemich 0:d7bd7384a37c 100 LWIP_ASSERT("p != NULL", (p != NULL));
grzemich 0:d7bd7384a37c 101
grzemich 0:d7bd7384a37c 102 LWIP_UNUSED_ARG(ipaddr);
grzemich 0:d7bd7384a37c 103
grzemich 0:d7bd7384a37c 104 priv = netif->state;
grzemich 0:d7bd7384a37c 105
grzemich 0:d7bd7384a37c 106 /* Send pbuf out on the serial I/O device. */
grzemich 0:d7bd7384a37c 107 sio_send(SLIP_END, priv->sd);
grzemich 0:d7bd7384a37c 108
grzemich 0:d7bd7384a37c 109 for (q = p; q != NULL; q = q->next) {
grzemich 0:d7bd7384a37c 110 for (i = 0; i < q->len; i++) {
grzemich 0:d7bd7384a37c 111 c = ((u8_t *)q->payload)[i];
grzemich 0:d7bd7384a37c 112 switch (c) {
grzemich 0:d7bd7384a37c 113 case SLIP_END:
grzemich 0:d7bd7384a37c 114 sio_send(SLIP_ESC, priv->sd);
grzemich 0:d7bd7384a37c 115 sio_send(SLIP_ESC_END, priv->sd);
grzemich 0:d7bd7384a37c 116 break;
grzemich 0:d7bd7384a37c 117 case SLIP_ESC:
grzemich 0:d7bd7384a37c 118 sio_send(SLIP_ESC, priv->sd);
grzemich 0:d7bd7384a37c 119 sio_send(SLIP_ESC_ESC, priv->sd);
grzemich 0:d7bd7384a37c 120 break;
grzemich 0:d7bd7384a37c 121 default:
grzemich 0:d7bd7384a37c 122 sio_send(c, priv->sd);
grzemich 0:d7bd7384a37c 123 break;
grzemich 0:d7bd7384a37c 124 }
grzemich 0:d7bd7384a37c 125 }
grzemich 0:d7bd7384a37c 126 }
grzemich 0:d7bd7384a37c 127 sio_send(SLIP_END, priv->sd);
grzemich 0:d7bd7384a37c 128 return ERR_OK;
grzemich 0:d7bd7384a37c 129 }
grzemich 0:d7bd7384a37c 130
grzemich 0:d7bd7384a37c 131 /**
grzemich 0:d7bd7384a37c 132 * Static function for easy use of blockig or non-blocking
grzemich 0:d7bd7384a37c 133 * sio_read
grzemich 0:d7bd7384a37c 134 *
grzemich 0:d7bd7384a37c 135 * @param fd serial device handle
grzemich 0:d7bd7384a37c 136 * @param data pointer to data buffer for receiving
grzemich 0:d7bd7384a37c 137 * @param len maximum length (in bytes) of data to receive
grzemich 0:d7bd7384a37c 138 * @param block if 1, call sio_read; if 0, call sio_tryread
grzemich 0:d7bd7384a37c 139 * @return return value of sio_read of sio_tryread
grzemich 0:d7bd7384a37c 140 */
grzemich 0:d7bd7384a37c 141 static u32_t
grzemich 0:d7bd7384a37c 142 slip_sio_read(sio_fd_t fd, u8_t* data, u32_t len, u8_t block)
grzemich 0:d7bd7384a37c 143 {
grzemich 0:d7bd7384a37c 144 if (block) {
grzemich 0:d7bd7384a37c 145 return sio_read(fd, data, len);
grzemich 0:d7bd7384a37c 146 } else {
grzemich 0:d7bd7384a37c 147 return sio_tryread(fd, data, len);
grzemich 0:d7bd7384a37c 148 }
grzemich 0:d7bd7384a37c 149 }
grzemich 0:d7bd7384a37c 150
grzemich 0:d7bd7384a37c 151 /**
grzemich 0:d7bd7384a37c 152 * Handle the incoming SLIP stream character by character
grzemich 0:d7bd7384a37c 153 *
grzemich 0:d7bd7384a37c 154 * Poll the serial layer by calling sio_read() or sio_tryread().
grzemich 0:d7bd7384a37c 155 *
grzemich 0:d7bd7384a37c 156 * @param netif the lwip network interface structure for this slipif
grzemich 0:d7bd7384a37c 157 * @param block if 1, block until data is received; if 0, return when all data
grzemich 0:d7bd7384a37c 158 * from the buffer is received (multiple calls to this function will
grzemich 0:d7bd7384a37c 159 * return a complete packet, NULL is returned before - used for polling)
grzemich 0:d7bd7384a37c 160 * @return The IP packet when SLIP_END is received
grzemich 0:d7bd7384a37c 161 */
grzemich 0:d7bd7384a37c 162 static struct pbuf *
grzemich 0:d7bd7384a37c 163 slipif_input(struct netif *netif, u8_t block)
grzemich 0:d7bd7384a37c 164 {
grzemich 0:d7bd7384a37c 165 struct slipif_priv *priv;
grzemich 0:d7bd7384a37c 166 u8_t c;
grzemich 0:d7bd7384a37c 167 struct pbuf *t;
grzemich 0:d7bd7384a37c 168
grzemich 0:d7bd7384a37c 169 LWIP_ASSERT("netif != NULL", (netif != NULL));
grzemich 0:d7bd7384a37c 170 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
grzemich 0:d7bd7384a37c 171
grzemich 0:d7bd7384a37c 172 priv = netif->state;
grzemich 0:d7bd7384a37c 173
grzemich 0:d7bd7384a37c 174 while (slip_sio_read(priv->sd, &c, 1, block) > 0) {
grzemich 0:d7bd7384a37c 175 switch (priv->state) {
grzemich 0:d7bd7384a37c 176 case SLIP_RECV_NORMAL:
grzemich 0:d7bd7384a37c 177 switch (c) {
grzemich 0:d7bd7384a37c 178 case SLIP_END:
grzemich 0:d7bd7384a37c 179 if (priv->recved > 0) {
grzemich 0:d7bd7384a37c 180 /* Received whole packet. */
grzemich 0:d7bd7384a37c 181 /* Trim the pbuf to the size of the received packet. */
grzemich 0:d7bd7384a37c 182 pbuf_realloc(priv->q, priv->recved);
grzemich 0:d7bd7384a37c 183
grzemich 0:d7bd7384a37c 184 LINK_STATS_INC(link.recv);
grzemich 0:d7bd7384a37c 185
grzemich 0:d7bd7384a37c 186 LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet\n"));
grzemich 0:d7bd7384a37c 187 t = priv->q;
grzemich 0:d7bd7384a37c 188 priv->p = priv->q = NULL;
grzemich 0:d7bd7384a37c 189 priv->i = priv->recved = 0;
grzemich 0:d7bd7384a37c 190 return t;
grzemich 0:d7bd7384a37c 191 }
grzemich 0:d7bd7384a37c 192 continue;
grzemich 0:d7bd7384a37c 193 case SLIP_ESC:
grzemich 0:d7bd7384a37c 194 priv->state = SLIP_RECV_ESCAPE;
grzemich 0:d7bd7384a37c 195 continue;
grzemich 0:d7bd7384a37c 196 }
grzemich 0:d7bd7384a37c 197 break;
grzemich 0:d7bd7384a37c 198 case SLIP_RECV_ESCAPE:
grzemich 0:d7bd7384a37c 199 switch (c) {
grzemich 0:d7bd7384a37c 200 case SLIP_ESC_END:
grzemich 0:d7bd7384a37c 201 c = SLIP_END;
grzemich 0:d7bd7384a37c 202 break;
grzemich 0:d7bd7384a37c 203 case SLIP_ESC_ESC:
grzemich 0:d7bd7384a37c 204 c = SLIP_ESC;
grzemich 0:d7bd7384a37c 205 break;
grzemich 0:d7bd7384a37c 206 }
grzemich 0:d7bd7384a37c 207 priv->state = SLIP_RECV_NORMAL;
grzemich 0:d7bd7384a37c 208 /* FALLTHROUGH */
grzemich 0:d7bd7384a37c 209 }
grzemich 0:d7bd7384a37c 210
grzemich 0:d7bd7384a37c 211 /* byte received, packet not yet completely received */
grzemich 0:d7bd7384a37c 212 if (priv->p == NULL) {
grzemich 0:d7bd7384a37c 213 /* allocate a new pbuf */
grzemich 0:d7bd7384a37c 214 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
grzemich 0:d7bd7384a37c 215 priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN), PBUF_POOL);
grzemich 0:d7bd7384a37c 216
grzemich 0:d7bd7384a37c 217 if (priv->p == NULL) {
grzemich 0:d7bd7384a37c 218 LINK_STATS_INC(link.drop);
grzemich 0:d7bd7384a37c 219 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
grzemich 0:d7bd7384a37c 220 /* don't process any further since we got no pbuf to receive to */
grzemich 0:d7bd7384a37c 221 break;
grzemich 0:d7bd7384a37c 222 }
grzemich 0:d7bd7384a37c 223
grzemich 0:d7bd7384a37c 224 if (priv->q != NULL) {
grzemich 0:d7bd7384a37c 225 /* 'chain' the pbuf to the existing chain */
grzemich 0:d7bd7384a37c 226 pbuf_cat(priv->q, priv->p);
grzemich 0:d7bd7384a37c 227 } else {
grzemich 0:d7bd7384a37c 228 /* p is the first pbuf in the chain */
grzemich 0:d7bd7384a37c 229 priv->q = priv->p;
grzemich 0:d7bd7384a37c 230 }
grzemich 0:d7bd7384a37c 231 }
grzemich 0:d7bd7384a37c 232
grzemich 0:d7bd7384a37c 233 /* this automatically drops bytes if > SLIP_MAX_SIZE */
grzemich 0:d7bd7384a37c 234 if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
grzemich 0:d7bd7384a37c 235 ((u8_t *)priv->p->payload)[priv->i] = c;
grzemich 0:d7bd7384a37c 236 priv->recved++;
grzemich 0:d7bd7384a37c 237 priv->i++;
grzemich 0:d7bd7384a37c 238 if (priv->i >= priv->p->len) {
grzemich 0:d7bd7384a37c 239 /* on to the next pbuf */
grzemich 0:d7bd7384a37c 240 priv->i = 0;
grzemich 0:d7bd7384a37c 241 if (priv->p->next != NULL && priv->p->next->len > 0) {
grzemich 0:d7bd7384a37c 242 /* p is a chain, on to the next in the chain */
grzemich 0:d7bd7384a37c 243 priv->p = priv->p->next;
grzemich 0:d7bd7384a37c 244 } else {
grzemich 0:d7bd7384a37c 245 /* p is a single pbuf, set it to NULL so next time a new
grzemich 0:d7bd7384a37c 246 * pbuf is allocated */
grzemich 0:d7bd7384a37c 247 priv->p = NULL;
grzemich 0:d7bd7384a37c 248 }
grzemich 0:d7bd7384a37c 249 }
grzemich 0:d7bd7384a37c 250 }
grzemich 0:d7bd7384a37c 251 }
grzemich 0:d7bd7384a37c 252
grzemich 0:d7bd7384a37c 253 return NULL;
grzemich 0:d7bd7384a37c 254 }
grzemich 0:d7bd7384a37c 255
grzemich 0:d7bd7384a37c 256 #if !NO_SYS
grzemich 0:d7bd7384a37c 257 /**
grzemich 0:d7bd7384a37c 258 * The SLIP input thread.
grzemich 0:d7bd7384a37c 259 *
grzemich 0:d7bd7384a37c 260 * Feed the IP layer with incoming packets
grzemich 0:d7bd7384a37c 261 *
grzemich 0:d7bd7384a37c 262 * @param nf the lwip network interface structure for this slipif
grzemich 0:d7bd7384a37c 263 */
grzemich 0:d7bd7384a37c 264 static void
grzemich 0:d7bd7384a37c 265 slipif_loop_thread(void *nf)
grzemich 0:d7bd7384a37c 266 {
grzemich 0:d7bd7384a37c 267 struct pbuf *p;
grzemich 0:d7bd7384a37c 268 struct netif *netif = (struct netif *)nf;
grzemich 0:d7bd7384a37c 269
grzemich 0:d7bd7384a37c 270 while (1) {
grzemich 0:d7bd7384a37c 271 p = slipif_input(netif, SLIP_BLOCK);
grzemich 0:d7bd7384a37c 272 if (p != NULL) {
grzemich 0:d7bd7384a37c 273 if (netif->input(p, netif) != ERR_OK) {
grzemich 0:d7bd7384a37c 274 pbuf_free(p);
grzemich 0:d7bd7384a37c 275 p = NULL;
grzemich 0:d7bd7384a37c 276 }
grzemich 0:d7bd7384a37c 277 }
grzemich 0:d7bd7384a37c 278 }
grzemich 0:d7bd7384a37c 279 }
grzemich 0:d7bd7384a37c 280 #endif /* !NO_SYS */
grzemich 0:d7bd7384a37c 281
grzemich 0:d7bd7384a37c 282 /**
grzemich 0:d7bd7384a37c 283 * SLIP netif initialization
grzemich 0:d7bd7384a37c 284 *
grzemich 0:d7bd7384a37c 285 * Call the arch specific sio_open and remember
grzemich 0:d7bd7384a37c 286 * the opened device in the state field of the netif.
grzemich 0:d7bd7384a37c 287 *
grzemich 0:d7bd7384a37c 288 * @param netif the lwip network interface structure for this slipif
grzemich 0:d7bd7384a37c 289 * @return ERR_OK if serial line could be opened,
grzemich 0:d7bd7384a37c 290 * ERR_MEM if no memory could be allocated,
grzemich 0:d7bd7384a37c 291 * ERR_IF is serial line couldn't be opened
grzemich 0:d7bd7384a37c 292 *
grzemich 0:d7bd7384a37c 293 * @note netif->num must contain the number of the serial port to open
grzemich 0:d7bd7384a37c 294 * (0 by default)
grzemich 0:d7bd7384a37c 295 */
grzemich 0:d7bd7384a37c 296 err_t
grzemich 0:d7bd7384a37c 297 slipif_init(struct netif *netif)
grzemich 0:d7bd7384a37c 298 {
grzemich 0:d7bd7384a37c 299 struct slipif_priv *priv;
grzemich 0:d7bd7384a37c 300
grzemich 0:d7bd7384a37c 301 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)netif->num));
grzemich 0:d7bd7384a37c 302
grzemich 0:d7bd7384a37c 303 /* Allocate private data */
grzemich 0:d7bd7384a37c 304 priv = mem_malloc(sizeof(struct slipif_priv));
grzemich 0:d7bd7384a37c 305 if (!priv) {
grzemich 0:d7bd7384a37c 306 return ERR_MEM;
grzemich 0:d7bd7384a37c 307 }
grzemich 0:d7bd7384a37c 308
grzemich 0:d7bd7384a37c 309 netif->name[0] = 's';
grzemich 0:d7bd7384a37c 310 netif->name[1] = 'l';
grzemich 0:d7bd7384a37c 311 netif->output = slipif_output;
grzemich 0:d7bd7384a37c 312 netif->mtu = SLIP_MAX_SIZE;
grzemich 0:d7bd7384a37c 313 netif->flags |= NETIF_FLAG_POINTTOPOINT;
grzemich 0:d7bd7384a37c 314
grzemich 0:d7bd7384a37c 315 /* Try to open the serial port (netif->num contains the port number). */
grzemich 0:d7bd7384a37c 316 priv->sd = sio_open(netif->num);
grzemich 0:d7bd7384a37c 317 if (!priv->sd) {
grzemich 0:d7bd7384a37c 318 /* Opening the serial port failed. */
grzemich 0:d7bd7384a37c 319 mem_free(priv);
grzemich 0:d7bd7384a37c 320 return ERR_IF;
grzemich 0:d7bd7384a37c 321 }
grzemich 0:d7bd7384a37c 322
grzemich 0:d7bd7384a37c 323 /* Initialize private data */
grzemich 0:d7bd7384a37c 324 priv->p = NULL;
grzemich 0:d7bd7384a37c 325 priv->q = NULL;
grzemich 0:d7bd7384a37c 326 priv->state = SLIP_RECV_NORMAL;
grzemich 0:d7bd7384a37c 327 priv->i = 0;
grzemich 0:d7bd7384a37c 328 priv->recved = 0;
grzemich 0:d7bd7384a37c 329
grzemich 0:d7bd7384a37c 330 netif->state = priv;
grzemich 0:d7bd7384a37c 331
grzemich 0:d7bd7384a37c 332 /* initialize the snmp variables and counters inside the struct netif
grzemich 0:d7bd7384a37c 333 * ifSpeed: no assumption can be made without knowing more about the
grzemich 0:d7bd7384a37c 334 * serial line!
grzemich 0:d7bd7384a37c 335 */
grzemich 0:d7bd7384a37c 336 NETIF_INIT_SNMP(netif, snmp_ifType_slip, 0);
grzemich 0:d7bd7384a37c 337
grzemich 0:d7bd7384a37c 338 /* Create a thread to poll the serial line. */
grzemich 0:d7bd7384a37c 339 sys_thread_new(SLIPIF_THREAD_NAME, slipif_loop_thread, netif,
grzemich 0:d7bd7384a37c 340 SLIPIF_THREAD_STACKSIZE, SLIPIF_THREAD_PRIO);
grzemich 0:d7bd7384a37c 341 return ERR_OK;
grzemich 0:d7bd7384a37c 342 }
grzemich 0:d7bd7384a37c 343
grzemich 0:d7bd7384a37c 344 /**
grzemich 0:d7bd7384a37c 345 * Polls the serial device and feeds the IP layer with incoming packets.
grzemich 0:d7bd7384a37c 346 *
grzemich 0:d7bd7384a37c 347 * @param netif The lwip network interface structure for this slipif
grzemich 0:d7bd7384a37c 348 */
grzemich 0:d7bd7384a37c 349 void
grzemich 0:d7bd7384a37c 350 slipif_poll(struct netif *netif)
grzemich 0:d7bd7384a37c 351 {
grzemich 0:d7bd7384a37c 352 struct pbuf *p;
grzemich 0:d7bd7384a37c 353 struct slipif_priv *priv;
grzemich 0:d7bd7384a37c 354
grzemich 0:d7bd7384a37c 355 LWIP_ASSERT("netif != NULL", (netif != NULL));
grzemich 0:d7bd7384a37c 356 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
grzemich 0:d7bd7384a37c 357
grzemich 0:d7bd7384a37c 358 priv = netif->state;
grzemich 0:d7bd7384a37c 359
grzemich 0:d7bd7384a37c 360 while ((p = slipif_input(netif, SLIP_DONTBLOCK)) != NULL) {
grzemich 0:d7bd7384a37c 361 if (netif->input(p, netif) != ERR_OK) {
grzemich 0:d7bd7384a37c 362 pbuf_free(p);
grzemich 0:d7bd7384a37c 363 }
grzemich 0:d7bd7384a37c 364 }
grzemich 0:d7bd7384a37c 365 }
grzemich 0:d7bd7384a37c 366
grzemich 0:d7bd7384a37c 367 #endif /* LWIP_HAVE_SLIPIF */