Kiyoshi Hayakawa / lwip

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Fork of lwip by mbed official

netif/slipif.c@13:931deec14b08, 2013-09-10 (annotated)

Committer:
bogdanm
Date:
Tue Sep 10 15:14:39 2013 +0300
Revision:
13:931deec14b08
Parent:
0:51ac1d130fd4 
Sync with git revision 171dda705c947bf910926a0b73d6a4797802554d

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:51ac1d130fd4 1 /**
mbed_official 0:51ac1d130fd4 2 * @file
mbed_official 0:51ac1d130fd4 3 * SLIP Interface
mbed_official 0:51ac1d130fd4 4 *
mbed_official 0:51ac1d130fd4 5 */
mbed_official 0:51ac1d130fd4 6
mbed_official 0:51ac1d130fd4 7 /*
mbed_official 0:51ac1d130fd4 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
mbed_official 0:51ac1d130fd4 9 * All rights reserved.
mbed_official 0:51ac1d130fd4 10 *
mbed_official 0:51ac1d130fd4 11 * Redistribution and use in source and binary forms, with or without
mbed_official 0:51ac1d130fd4 12 * modification, are permitted provided that the following conditions
mbed_official 0:51ac1d130fd4 13 * are met:
mbed_official 0:51ac1d130fd4 14 * 1. Redistributions of source code must retain the above copyright
mbed_official 0:51ac1d130fd4 15 * notice, this list of conditions and the following disclaimer.
mbed_official 0:51ac1d130fd4 16 * 2. Redistributions in binary form must reproduce the above copyright
mbed_official 0:51ac1d130fd4 17 * notice, this list of conditions and the following disclaimer in the
mbed_official 0:51ac1d130fd4 18 * documentation and/or other materials provided with the distribution.
mbed_official 0:51ac1d130fd4 19 * 3. Neither the name of the Institute nor the names of its contributors
mbed_official 0:51ac1d130fd4 20 * may be used to endorse or promote products derived from this software
mbed_official 0:51ac1d130fd4 21 * without specific prior written permission.
mbed_official 0:51ac1d130fd4 22 *
mbed_official 0:51ac1d130fd4 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
mbed_official 0:51ac1d130fd4 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 0:51ac1d130fd4 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
mbed_official 0:51ac1d130fd4 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
mbed_official 0:51ac1d130fd4 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 0:51ac1d130fd4 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
mbed_official 0:51ac1d130fd4 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
mbed_official 0:51ac1d130fd4 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
mbed_official 0:51ac1d130fd4 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
mbed_official 0:51ac1d130fd4 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
mbed_official 0:51ac1d130fd4 33 * SUCH DAMAGE.
mbed_official 0:51ac1d130fd4 34 *
mbed_official 0:51ac1d130fd4 35 * This file is built upon the file: src/arch/rtxc/netif/sioslip.c
mbed_official 0:51ac1d130fd4 36 *
mbed_official 0:51ac1d130fd4 37 * Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com>
mbed_official 0:51ac1d130fd4 38 */
mbed_official 0:51ac1d130fd4 39
mbed_official 0:51ac1d130fd4 40 /*
mbed_official 0:51ac1d130fd4 41 * This is an arch independent SLIP netif. The specific serial hooks must be
mbed_official 0:51ac1d130fd4 42 * provided by another file. They are sio_open, sio_read/sio_tryread and sio_send
mbed_official 0:51ac1d130fd4 43 */
mbed_official 0:51ac1d130fd4 44
mbed_official 0:51ac1d130fd4 45 #include "netif/slipif.h"
mbed_official 0:51ac1d130fd4 46 #include "lwip/opt.h"
mbed_official 0:51ac1d130fd4 47
mbed_official 0:51ac1d130fd4 48 #if LWIP_HAVE_SLIPIF
mbed_official 0:51ac1d130fd4 49
mbed_official 0:51ac1d130fd4 50 #include "lwip/def.h"
mbed_official 0:51ac1d130fd4 51 #include "lwip/pbuf.h"
mbed_official 0:51ac1d130fd4 52 #include "lwip/sys.h"
mbed_official 0:51ac1d130fd4 53 #include "lwip/stats.h"
mbed_official 0:51ac1d130fd4 54 #include "lwip/snmp.h"
mbed_official 0:51ac1d130fd4 55 #include "lwip/sio.h"
mbed_official 0:51ac1d130fd4 56
mbed_official 0:51ac1d130fd4 57 #define SLIP_BLOCK 1
mbed_official 0:51ac1d130fd4 58 #define SLIP_DONTBLOCK 0
mbed_official 0:51ac1d130fd4 59
mbed_official 0:51ac1d130fd4 60 #define SLIP_END 0300 /* 0xC0 */
mbed_official 0:51ac1d130fd4 61 #define SLIP_ESC 0333 /* 0xDB */
mbed_official 0:51ac1d130fd4 62 #define SLIP_ESC_END 0334 /* 0xDC */
mbed_official 0:51ac1d130fd4 63 #define SLIP_ESC_ESC 0335 /* 0xDD */
mbed_official 0:51ac1d130fd4 64
mbed_official 0:51ac1d130fd4 65 #define SLIP_MAX_SIZE 1500
mbed_official 0:51ac1d130fd4 66
mbed_official 0:51ac1d130fd4 67 enum slipif_recv_state {
mbed_official 0:51ac1d130fd4 68 SLIP_RECV_NORMAL,
mbed_official 0:51ac1d130fd4 69 SLIP_RECV_ESCAPE,
mbed_official 0:51ac1d130fd4 70 };
mbed_official 0:51ac1d130fd4 71
mbed_official 0:51ac1d130fd4 72 struct slipif_priv {
mbed_official 0:51ac1d130fd4 73 sio_fd_t sd;
mbed_official 0:51ac1d130fd4 74 /* q is the whole pbuf chain for a packet, p is the current pbuf in the chain */
mbed_official 0:51ac1d130fd4 75 struct pbuf *p, *q;
mbed_official 0:51ac1d130fd4 76 enum slipif_recv_state state;
mbed_official 0:51ac1d130fd4 77 u16_t i, recved;
mbed_official 0:51ac1d130fd4 78 };
mbed_official 0:51ac1d130fd4 79
mbed_official 0:51ac1d130fd4 80 /**
mbed_official 0:51ac1d130fd4 81 * Send a pbuf doing the necessary SLIP encapsulation
mbed_official 0:51ac1d130fd4 82 *
mbed_official 0:51ac1d130fd4 83 * Uses the serial layer's sio_send()
mbed_official 0:51ac1d130fd4 84 *
mbed_official 0:51ac1d130fd4 85 * @param netif the lwip network interface structure for this slipif
mbed_official 0:51ac1d130fd4 86 * @param p the pbuf chaing packet to send
mbed_official 0:51ac1d130fd4 87 * @param ipaddr the ip address to send the packet to (not used for slipif)
mbed_official 0:51ac1d130fd4 88 * @return always returns ERR_OK since the serial layer does not provide return values
mbed_official 0:51ac1d130fd4 89 */
mbed_official 0:51ac1d130fd4 90 err_t
mbed_official 0:51ac1d130fd4 91 slipif_output(struct netif *netif, struct pbuf *p, ip_addr_t *ipaddr)
mbed_official 0:51ac1d130fd4 92 {
mbed_official 0:51ac1d130fd4 93 struct slipif_priv *priv;
mbed_official 0:51ac1d130fd4 94 struct pbuf *q;
mbed_official 0:51ac1d130fd4 95 u16_t i;
mbed_official 0:51ac1d130fd4 96 u8_t c;
mbed_official 0:51ac1d130fd4 97
mbed_official 0:51ac1d130fd4 98 LWIP_ASSERT("netif != NULL", (netif != NULL));
mbed_official 0:51ac1d130fd4 99 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
mbed_official 0:51ac1d130fd4 100 LWIP_ASSERT("p != NULL", (p != NULL));
mbed_official 0:51ac1d130fd4 101
mbed_official 0:51ac1d130fd4 102 LWIP_UNUSED_ARG(ipaddr);
mbed_official 0:51ac1d130fd4 103
mbed_official 0:51ac1d130fd4 104 priv = netif->state;
mbed_official 0:51ac1d130fd4 105
mbed_official 0:51ac1d130fd4 106 /* Send pbuf out on the serial I/O device. */
mbed_official 0:51ac1d130fd4 107 sio_send(SLIP_END, priv->sd);
mbed_official 0:51ac1d130fd4 108
mbed_official 0:51ac1d130fd4 109 for (q = p; q != NULL; q = q->next) {
mbed_official 0:51ac1d130fd4 110 for (i = 0; i < q->len; i++) {
mbed_official 0:51ac1d130fd4 111 c = ((u8_t *)q->payload)[i];
mbed_official 0:51ac1d130fd4 112 switch (c) {
mbed_official 0:51ac1d130fd4 113 case SLIP_END:
mbed_official 0:51ac1d130fd4 114 sio_send(SLIP_ESC, priv->sd);
mbed_official 0:51ac1d130fd4 115 sio_send(SLIP_ESC_END, priv->sd);
mbed_official 0:51ac1d130fd4 116 break;
mbed_official 0:51ac1d130fd4 117 case SLIP_ESC:
mbed_official 0:51ac1d130fd4 118 sio_send(SLIP_ESC, priv->sd);
mbed_official 0:51ac1d130fd4 119 sio_send(SLIP_ESC_ESC, priv->sd);
mbed_official 0:51ac1d130fd4 120 break;
mbed_official 0:51ac1d130fd4 121 default:
mbed_official 0:51ac1d130fd4 122 sio_send(c, priv->sd);
mbed_official 0:51ac1d130fd4 123 break;
mbed_official 0:51ac1d130fd4 124 }
mbed_official 0:51ac1d130fd4 125 }
mbed_official 0:51ac1d130fd4 126 }
mbed_official 0:51ac1d130fd4 127 sio_send(SLIP_END, priv->sd);
mbed_official 0:51ac1d130fd4 128 return ERR_OK;
mbed_official 0:51ac1d130fd4 129 }
mbed_official 0:51ac1d130fd4 130
mbed_official 0:51ac1d130fd4 131 /**
mbed_official 0:51ac1d130fd4 132 * Static function for easy use of blockig or non-blocking
mbed_official 0:51ac1d130fd4 133 * sio_read
mbed_official 0:51ac1d130fd4 134 *
mbed_official 0:51ac1d130fd4 135 * @param fd serial device handle
mbed_official 0:51ac1d130fd4 136 * @param data pointer to data buffer for receiving
mbed_official 0:51ac1d130fd4 137 * @param len maximum length (in bytes) of data to receive
mbed_official 0:51ac1d130fd4 138 * @param block if 1, call sio_read; if 0, call sio_tryread
mbed_official 0:51ac1d130fd4 139 * @return return value of sio_read of sio_tryread
mbed_official 0:51ac1d130fd4 140 */
mbed_official 0:51ac1d130fd4 141 static u32_t
mbed_official 0:51ac1d130fd4 142 slip_sio_read(sio_fd_t fd, u8_t* data, u32_t len, u8_t block)
mbed_official 0:51ac1d130fd4 143 {
mbed_official 0:51ac1d130fd4 144 if (block) {
mbed_official 0:51ac1d130fd4 145 return sio_read(fd, data, len);
mbed_official 0:51ac1d130fd4 146 } else {
mbed_official 0:51ac1d130fd4 147 return sio_tryread(fd, data, len);
mbed_official 0:51ac1d130fd4 148 }
mbed_official 0:51ac1d130fd4 149 }
mbed_official 0:51ac1d130fd4 150
mbed_official 0:51ac1d130fd4 151 /**
mbed_official 0:51ac1d130fd4 152 * Handle the incoming SLIP stream character by character
mbed_official 0:51ac1d130fd4 153 *
mbed_official 0:51ac1d130fd4 154 * Poll the serial layer by calling sio_read() or sio_tryread().
mbed_official 0:51ac1d130fd4 155 *
mbed_official 0:51ac1d130fd4 156 * @param netif the lwip network interface structure for this slipif
mbed_official 0:51ac1d130fd4 157 * @param block if 1, block until data is received; if 0, return when all data
mbed_official 0:51ac1d130fd4 158 * from the buffer is received (multiple calls to this function will
mbed_official 0:51ac1d130fd4 159 * return a complete packet, NULL is returned before - used for polling)
mbed_official 0:51ac1d130fd4 160 * @return The IP packet when SLIP_END is received
mbed_official 0:51ac1d130fd4 161 */
mbed_official 0:51ac1d130fd4 162 static struct pbuf *
mbed_official 0:51ac1d130fd4 163 slipif_input(struct netif *netif, u8_t block)
mbed_official 0:51ac1d130fd4 164 {
mbed_official 0:51ac1d130fd4 165 struct slipif_priv *priv;
mbed_official 0:51ac1d130fd4 166 u8_t c;
mbed_official 0:51ac1d130fd4 167 struct pbuf *t;
mbed_official 0:51ac1d130fd4 168
mbed_official 0:51ac1d130fd4 169 LWIP_ASSERT("netif != NULL", (netif != NULL));
mbed_official 0:51ac1d130fd4 170 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
mbed_official 0:51ac1d130fd4 171
mbed_official 0:51ac1d130fd4 172 priv = netif->state;
mbed_official 0:51ac1d130fd4 173
mbed_official 0:51ac1d130fd4 174 while (slip_sio_read(priv->sd, &c, 1, block) > 0) {
mbed_official 0:51ac1d130fd4 175 switch (priv->state) {
mbed_official 0:51ac1d130fd4 176 case SLIP_RECV_NORMAL:
mbed_official 0:51ac1d130fd4 177 switch (c) {
mbed_official 0:51ac1d130fd4 178 case SLIP_END:
mbed_official 0:51ac1d130fd4 179 if (priv->recved > 0) {
mbed_official 0:51ac1d130fd4 180 /* Received whole packet. */
mbed_official 0:51ac1d130fd4 181 /* Trim the pbuf to the size of the received packet. */
mbed_official 0:51ac1d130fd4 182 pbuf_realloc(priv->q, priv->recved);
mbed_official 0:51ac1d130fd4 183
mbed_official 0:51ac1d130fd4 184 LINK_STATS_INC(link.recv);
mbed_official 0:51ac1d130fd4 185
mbed_official 0:51ac1d130fd4 186 LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet\n"));
mbed_official 0:51ac1d130fd4 187 t = priv->q;
mbed_official 0:51ac1d130fd4 188 priv->p = priv->q = NULL;
mbed_official 0:51ac1d130fd4 189 priv->i = priv->recved = 0;
mbed_official 0:51ac1d130fd4 190 return t;
mbed_official 0:51ac1d130fd4 191 }
mbed_official 0:51ac1d130fd4 192 continue;
mbed_official 0:51ac1d130fd4 193 case SLIP_ESC:
mbed_official 0:51ac1d130fd4 194 priv->state = SLIP_RECV_ESCAPE;
mbed_official 0:51ac1d130fd4 195 continue;
mbed_official 0:51ac1d130fd4 196 }
mbed_official 0:51ac1d130fd4 197 break;
mbed_official 0:51ac1d130fd4 198 case SLIP_RECV_ESCAPE:
mbed_official 0:51ac1d130fd4 199 switch (c) {
mbed_official 0:51ac1d130fd4 200 case SLIP_ESC_END:
mbed_official 0:51ac1d130fd4 201 c = SLIP_END;
mbed_official 0:51ac1d130fd4 202 break;
mbed_official 0:51ac1d130fd4 203 case SLIP_ESC_ESC:
mbed_official 0:51ac1d130fd4 204 c = SLIP_ESC;
mbed_official 0:51ac1d130fd4 205 break;
mbed_official 0:51ac1d130fd4 206 }
mbed_official 0:51ac1d130fd4 207 priv->state = SLIP_RECV_NORMAL;
mbed_official 0:51ac1d130fd4 208 /* FALLTHROUGH */
mbed_official 0:51ac1d130fd4 209 }
mbed_official 0:51ac1d130fd4 210
mbed_official 0:51ac1d130fd4 211 /* byte received, packet not yet completely received */
mbed_official 0:51ac1d130fd4 212 if (priv->p == NULL) {
mbed_official 0:51ac1d130fd4 213 /* allocate a new pbuf */
mbed_official 0:51ac1d130fd4 214 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
mbed_official 0:51ac1d130fd4 215 priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN), PBUF_POOL);
mbed_official 0:51ac1d130fd4 216
mbed_official 0:51ac1d130fd4 217 if (priv->p == NULL) {
mbed_official 0:51ac1d130fd4 218 LINK_STATS_INC(link.drop);
mbed_official 0:51ac1d130fd4 219 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
mbed_official 0:51ac1d130fd4 220 /* don't process any further since we got no pbuf to receive to */
mbed_official 0:51ac1d130fd4 221 break;
mbed_official 0:51ac1d130fd4 222 }
mbed_official 0:51ac1d130fd4 223
mbed_official 0:51ac1d130fd4 224 if (priv->q != NULL) {
mbed_official 0:51ac1d130fd4 225 /* 'chain' the pbuf to the existing chain */
mbed_official 0:51ac1d130fd4 226 pbuf_cat(priv->q, priv->p);
mbed_official 0:51ac1d130fd4 227 } else {
mbed_official 0:51ac1d130fd4 228 /* p is the first pbuf in the chain */
mbed_official 0:51ac1d130fd4 229 priv->q = priv->p;
mbed_official 0:51ac1d130fd4 230 }
mbed_official 0:51ac1d130fd4 231 }
mbed_official 0:51ac1d130fd4 232
mbed_official 0:51ac1d130fd4 233 /* this automatically drops bytes if > SLIP_MAX_SIZE */
mbed_official 0:51ac1d130fd4 234 if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
mbed_official 0:51ac1d130fd4 235 ((u8_t *)priv->p->payload)[priv->i] = c;
mbed_official 0:51ac1d130fd4 236 priv->recved++;
mbed_official 0:51ac1d130fd4 237 priv->i++;
mbed_official 0:51ac1d130fd4 238 if (priv->i >= priv->p->len) {
mbed_official 0:51ac1d130fd4 239 /* on to the next pbuf */
mbed_official 0:51ac1d130fd4 240 priv->i = 0;
mbed_official 0:51ac1d130fd4 241 if (priv->p->next != NULL && priv->p->next->len > 0) {
mbed_official 0:51ac1d130fd4 242 /* p is a chain, on to the next in the chain */
mbed_official 0:51ac1d130fd4 243 priv->p = priv->p->next;
mbed_official 0:51ac1d130fd4 244 } else {
mbed_official 0:51ac1d130fd4 245 /* p is a single pbuf, set it to NULL so next time a new
mbed_official 0:51ac1d130fd4 246 * pbuf is allocated */
mbed_official 0:51ac1d130fd4 247 priv->p = NULL;
mbed_official 0:51ac1d130fd4 248 }
mbed_official 0:51ac1d130fd4 249 }
mbed_official 0:51ac1d130fd4 250 }
mbed_official 0:51ac1d130fd4 251 }
mbed_official 0:51ac1d130fd4 252
mbed_official 0:51ac1d130fd4 253 return NULL;
mbed_official 0:51ac1d130fd4 254 }
mbed_official 0:51ac1d130fd4 255
mbed_official 0:51ac1d130fd4 256 #if !NO_SYS
mbed_official 0:51ac1d130fd4 257 /**
mbed_official 0:51ac1d130fd4 258 * The SLIP input thread.
mbed_official 0:51ac1d130fd4 259 *
mbed_official 0:51ac1d130fd4 260 * Feed the IP layer with incoming packets
mbed_official 0:51ac1d130fd4 261 *
mbed_official 0:51ac1d130fd4 262 * @param nf the lwip network interface structure for this slipif
mbed_official 0:51ac1d130fd4 263 */
mbed_official 0:51ac1d130fd4 264 static void
mbed_official 0:51ac1d130fd4 265 slipif_loop_thread(void *nf)
mbed_official 0:51ac1d130fd4 266 {
mbed_official 0:51ac1d130fd4 267 struct pbuf *p;
mbed_official 0:51ac1d130fd4 268 struct netif *netif = (struct netif *)nf;
mbed_official 0:51ac1d130fd4 269
mbed_official 0:51ac1d130fd4 270 while (1) {
mbed_official 0:51ac1d130fd4 271 p = slipif_input(netif, SLIP_BLOCK);
mbed_official 0:51ac1d130fd4 272 if (p != NULL) {
mbed_official 0:51ac1d130fd4 273 if (netif->input(p, netif) != ERR_OK) {
mbed_official 0:51ac1d130fd4 274 pbuf_free(p);
mbed_official 0:51ac1d130fd4 275 p = NULL;
mbed_official 0:51ac1d130fd4 276 }
mbed_official 0:51ac1d130fd4 277 }
mbed_official 0:51ac1d130fd4 278 }
mbed_official 0:51ac1d130fd4 279 }
mbed_official 0:51ac1d130fd4 280 #endif /* !NO_SYS */
mbed_official 0:51ac1d130fd4 281
mbed_official 0:51ac1d130fd4 282 /**
mbed_official 0:51ac1d130fd4 283 * SLIP netif initialization
mbed_official 0:51ac1d130fd4 284 *
mbed_official 0:51ac1d130fd4 285 * Call the arch specific sio_open and remember
mbed_official 0:51ac1d130fd4 286 * the opened device in the state field of the netif.
mbed_official 0:51ac1d130fd4 287 *
mbed_official 0:51ac1d130fd4 288 * @param netif the lwip network interface structure for this slipif
mbed_official 0:51ac1d130fd4 289 * @return ERR_OK if serial line could be opened,
mbed_official 0:51ac1d130fd4 290 * ERR_MEM if no memory could be allocated,
mbed_official 0:51ac1d130fd4 291 * ERR_IF is serial line couldn't be opened
mbed_official 0:51ac1d130fd4 292 *
mbed_official 0:51ac1d130fd4 293 * @note netif->num must contain the number of the serial port to open
mbed_official 0:51ac1d130fd4 294 * (0 by default)
mbed_official 0:51ac1d130fd4 295 */
mbed_official 0:51ac1d130fd4 296 err_t
mbed_official 0:51ac1d130fd4 297 slipif_init(struct netif *netif)
mbed_official 0:51ac1d130fd4 298 {
mbed_official 0:51ac1d130fd4 299 struct slipif_priv *priv;
mbed_official 0:51ac1d130fd4 300
mbed_official 0:51ac1d130fd4 301 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)netif->num));
mbed_official 0:51ac1d130fd4 302
mbed_official 0:51ac1d130fd4 303 /* Allocate private data */
mbed_official 0:51ac1d130fd4 304 priv = mem_malloc(sizeof(struct slipif_priv));
mbed_official 0:51ac1d130fd4 305 if (!priv) {
mbed_official 0:51ac1d130fd4 306 return ERR_MEM;
mbed_official 0:51ac1d130fd4 307 }
mbed_official 0:51ac1d130fd4 308
mbed_official 0:51ac1d130fd4 309 netif->name[0] = 's';
mbed_official 0:51ac1d130fd4 310 netif->name[1] = 'l';
mbed_official 0:51ac1d130fd4 311 netif->output = slipif_output;
mbed_official 0:51ac1d130fd4 312 netif->mtu = SLIP_MAX_SIZE;
mbed_official 0:51ac1d130fd4 313 netif->flags |= NETIF_FLAG_POINTTOPOINT;
mbed_official 0:51ac1d130fd4 314
mbed_official 0:51ac1d130fd4 315 /* Try to open the serial port (netif->num contains the port number). */
mbed_official 0:51ac1d130fd4 316 priv->sd = sio_open(netif->num);
mbed_official 0:51ac1d130fd4 317 if (!priv->sd) {
mbed_official 0:51ac1d130fd4 318 /* Opening the serial port failed. */
mbed_official 0:51ac1d130fd4 319 mem_free(priv);
mbed_official 0:51ac1d130fd4 320 return ERR_IF;
mbed_official 0:51ac1d130fd4 321 }
mbed_official 0:51ac1d130fd4 322
mbed_official 0:51ac1d130fd4 323 /* Initialize private data */
mbed_official 0:51ac1d130fd4 324 priv->p = NULL;
mbed_official 0:51ac1d130fd4 325 priv->q = NULL;
mbed_official 0:51ac1d130fd4 326 priv->state = SLIP_RECV_NORMAL;
mbed_official 0:51ac1d130fd4 327 priv->i = 0;
mbed_official 0:51ac1d130fd4 328 priv->recved = 0;
mbed_official 0:51ac1d130fd4 329
mbed_official 0:51ac1d130fd4 330 netif->state = priv;
mbed_official 0:51ac1d130fd4 331
mbed_official 0:51ac1d130fd4 332 /* initialize the snmp variables and counters inside the struct netif
mbed_official 0:51ac1d130fd4 333 * ifSpeed: no assumption can be made without knowing more about the
mbed_official 0:51ac1d130fd4 334 * serial line!
mbed_official 0:51ac1d130fd4 335 */
mbed_official 0:51ac1d130fd4 336 NETIF_INIT_SNMP(netif, snmp_ifType_slip, 0);
mbed_official 0:51ac1d130fd4 337
mbed_official 0:51ac1d130fd4 338 /* Create a thread to poll the serial line. */
mbed_official 0:51ac1d130fd4 339 sys_thread_new(SLIPIF_THREAD_NAME, slipif_loop_thread, netif,
mbed_official 0:51ac1d130fd4 340 SLIPIF_THREAD_STACKSIZE, SLIPIF_THREAD_PRIO);
mbed_official 0:51ac1d130fd4 341 return ERR_OK;
mbed_official 0:51ac1d130fd4 342 }
mbed_official 0:51ac1d130fd4 343
mbed_official 0:51ac1d130fd4 344 /**
mbed_official 0:51ac1d130fd4 345 * Polls the serial device and feeds the IP layer with incoming packets.
mbed_official 0:51ac1d130fd4 346 *
mbed_official 0:51ac1d130fd4 347 * @param netif The lwip network interface structure for this slipif
mbed_official 0:51ac1d130fd4 348 */
mbed_official 0:51ac1d130fd4 349 void
mbed_official 0:51ac1d130fd4 350 slipif_poll(struct netif *netif)
mbed_official 0:51ac1d130fd4 351 {
mbed_official 0:51ac1d130fd4 352 struct pbuf *p;
mbed_official 0:51ac1d130fd4 353 struct slipif_priv *priv;
mbed_official 0:51ac1d130fd4 354
mbed_official 0:51ac1d130fd4 355 LWIP_ASSERT("netif != NULL", (netif != NULL));
mbed_official 0:51ac1d130fd4 356 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
mbed_official 0:51ac1d130fd4 357
mbed_official 0:51ac1d130fd4 358 priv = netif->state;
mbed_official 0:51ac1d130fd4 359
mbed_official 0:51ac1d130fd4 360 while ((p = slipif_input(netif, SLIP_DONTBLOCK)) != NULL) {
mbed_official 0:51ac1d130fd4 361 if (netif->input(p, netif) != ERR_OK) {
mbed_official 0:51ac1d130fd4 362 pbuf_free(p);
mbed_official 0:51ac1d130fd4 363 }
mbed_official 0:51ac1d130fd4 364 }
mbed_official 0:51ac1d130fd4 365 }
mbed_official 0:51ac1d130fd4 366
mbed_official 0:51ac1d130fd4 367 #endif /* LWIP_HAVE_SLIPIF */