3 * Sequential API Main thread module
8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
11 * Redistribution and use in source and binary forms, with or without modification,
12 * are permitted provided that the following conditions are met:
14 * 1. Redistributions of source code must retain the above copyright notice,
15 * this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright notice,
17 * this list of conditions and the following disclaimer in the documentation
18 * and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
33 * This file is part of the lwIP TCP/IP stack.
35 * Author: Adam Dunkels <adam@sics.se>
41 #if !NO_SYS /* don't build if not configured for use in lwipopts.h */
44 #include "lwip/memp.h"
46 #include "lwip/pbuf.h"
47 #include "lwip/tcpip.h"
48 #include "lwip/init.h"
49 #include "netif/etharp.h"
50 #include "netif/ppp_oe.h"
52 /* global variables */
53 static tcpip_init_done_fn tcpip_init_done;
54 static void *tcpip_init_done_arg;
55 static sys_mbox_t mbox;
57 #if LWIP_TCPIP_CORE_LOCKING
58 /** The global semaphore to lock the stack. */
59 sys_mutex_t lock_tcpip_core;
60 #endif /* LWIP_TCPIP_CORE_LOCKING */
64 * The main lwIP thread. This thread has exclusive access to lwIP core functions
65 * (unless access to them is not locked). Other threads communicate with this
66 * thread using message boxes.
68 * It also starts all the timers to make sure they are running in the right
71 * @param arg unused argument
74 tcpip_thread(void *arg)
76 struct tcpip_msg *msg;
79 if (tcpip_init_done != NULL) {
80 tcpip_init_done(tcpip_init_done_arg);
84 while (1) { /* MAIN Loop */
86 /* wait for a message, timeouts are processed while waiting */
87 sys_timeouts_mbox_fetch(&mbox, (void **)&msg);
92 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: API message %p\n", (void *)msg));
93 msg->msg.apimsg->function(&(msg->msg.apimsg->msg));
95 #endif /* LWIP_NETCONN */
97 #if !LWIP_TCPIP_CORE_LOCKING_INPUT
99 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: PACKET %p\n", (void *)msg));
101 if (msg->msg.inp.netif->flags & (NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET)) {
102 ethernet_input(msg->msg.inp.p, msg->msg.inp.netif);
104 #endif /* LWIP_ETHERNET */
106 ip_input(msg->msg.inp.p, msg->msg.inp.netif);
108 memp_free(MEMP_TCPIP_MSG_INPKT, msg);
110 #endif /* LWIP_TCPIP_CORE_LOCKING_INPUT */
113 case TCPIP_MSG_NETIFAPI:
114 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: Netif API message %p\n", (void *)msg));
115 msg->msg.netifapimsg->function(&(msg->msg.netifapimsg->msg));
117 #endif /* LWIP_NETIF_API */
119 case TCPIP_MSG_CALLBACK:
120 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: CALLBACK %p\n", (void *)msg));
121 msg->msg.cb.function(msg->msg.cb.ctx);
122 memp_free(MEMP_TCPIP_MSG_API, msg);
125 #if LWIP_TCPIP_TIMEOUT
126 case TCPIP_MSG_TIMEOUT:
127 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: TIMEOUT %p\n", (void *)msg));
128 sys_timeout(msg->msg.tmo.msecs, msg->msg.tmo.h, msg->msg.tmo.arg);
129 memp_free(MEMP_TCPIP_MSG_API, msg);
131 case TCPIP_MSG_UNTIMEOUT:
132 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: UNTIMEOUT %p\n", (void *)msg));
133 sys_untimeout(msg->msg.tmo.h, msg->msg.tmo.arg);
134 memp_free(MEMP_TCPIP_MSG_API, msg);
136 #endif /* LWIP_TCPIP_TIMEOUT */
139 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: invalid message: %d\n", msg->type));
140 LWIP_ASSERT("tcpip_thread: invalid message", 0);
147 * Pass a received packet to tcpip_thread for input processing
149 * @param p the received packet, p->payload pointing to the Ethernet header or
150 * to an IP header (if inp doesn't have NETIF_FLAG_ETHARP or
151 * NETIF_FLAG_ETHERNET flags)
152 * @param inp the network interface on which the packet was received
155 tcpip_input(struct pbuf *p, struct netif *inp)
157 #if LWIP_TCPIP_CORE_LOCKING_INPUT
159 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_input: PACKET %p/%p\n", (void *)p, (void *)inp));
162 if (inp->flags & (NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET)) {
163 ret = ethernet_input(p, inp);
165 #endif /* LWIP_ETHERNET */
167 ret = ip_input(p, inp);
171 #else /* LWIP_TCPIP_CORE_LOCKING_INPUT */
172 struct tcpip_msg *msg;
174 if (sys_mbox_valid(&mbox)) {
175 msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_INPKT);
180 msg->type = TCPIP_MSG_INPKT;
182 msg->msg.inp.netif = inp;
183 if (sys_mbox_trypost(&mbox, msg) != ERR_OK) {
184 memp_free(MEMP_TCPIP_MSG_INPKT, msg);
190 #endif /* LWIP_TCPIP_CORE_LOCKING_INPUT */
194 * Call a specific function in the thread context of
195 * tcpip_thread for easy access synchronization.
196 * A function called in that way may access lwIP core code
197 * without fearing concurrent access.
199 * @param f the function to call
200 * @param ctx parameter passed to f
201 * @param block 1 to block until the request is posted, 0 to non-blocking mode
202 * @return ERR_OK if the function was called, another err_t if not
205 tcpip_callback_with_block(tcpip_callback_fn function, void *ctx, u8_t block)
207 struct tcpip_msg *msg;
209 if (sys_mbox_valid(&mbox)) {
210 msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
215 msg->type = TCPIP_MSG_CALLBACK;
216 msg->msg.cb.function = function;
217 msg->msg.cb.ctx = ctx;
219 sys_mbox_post(&mbox, msg);
221 if (sys_mbox_trypost(&mbox, msg) != ERR_OK) {
222 memp_free(MEMP_TCPIP_MSG_API, msg);
231 #if LWIP_TCPIP_TIMEOUT
233 * call sys_timeout in tcpip_thread
235 * @param msec time in milliseconds for timeout
236 * @param h function to be called on timeout
237 * @param arg argument to pass to timeout function h
238 * @return ERR_MEM on memory error, ERR_OK otherwise
241 tcpip_timeout(u32_t msecs, sys_timeout_handler h, void *arg)
243 struct tcpip_msg *msg;
245 if (sys_mbox_valid(&mbox)) {
246 msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
251 msg->type = TCPIP_MSG_TIMEOUT;
252 msg->msg.tmo.msecs = msecs;
254 msg->msg.tmo.arg = arg;
255 sys_mbox_post(&mbox, msg);
262 * call sys_untimeout in tcpip_thread
264 * @param msec time in milliseconds for timeout
265 * @param h function to be called on timeout
266 * @param arg argument to pass to timeout function h
267 * @return ERR_MEM on memory error, ERR_OK otherwise
270 tcpip_untimeout(sys_timeout_handler h, void *arg)
272 struct tcpip_msg *msg;
274 if (sys_mbox_valid(&mbox)) {
275 msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
280 msg->type = TCPIP_MSG_UNTIMEOUT;
282 msg->msg.tmo.arg = arg;
283 sys_mbox_post(&mbox, msg);
288 #endif /* LWIP_TCPIP_TIMEOUT */
292 * Call the lower part of a netconn_* function
293 * This function is then running in the thread context
294 * of tcpip_thread and has exclusive access to lwIP core code.
296 * @param apimsg a struct containing the function to call and its parameters
297 * @return ERR_OK if the function was called, another err_t if not
300 tcpip_apimsg(struct api_msg *apimsg)
302 struct tcpip_msg msg;
304 /* catch functions that don't set err */
305 apimsg->msg.err = ERR_VAL;
308 if (sys_mbox_valid(&mbox)) {
309 msg.type = TCPIP_MSG_API;
310 msg.msg.apimsg = apimsg;
311 sys_mbox_post(&mbox, &msg);
312 sys_arch_sem_wait(&apimsg->msg.conn->op_completed, 0);
313 return apimsg->msg.err;
318 #if LWIP_TCPIP_CORE_LOCKING
320 * Call the lower part of a netconn_* function
321 * This function has exclusive access to lwIP core code by locking it
322 * before the function is called.
324 * @param apimsg a struct containing the function to call and its parameters
325 * @return ERR_OK (only for compatibility fo tcpip_apimsg())
328 tcpip_apimsg_lock(struct api_msg *apimsg)
331 /* catch functions that don't set err */
332 apimsg->msg.err = ERR_VAL;
336 apimsg->function(&(apimsg->msg));
338 return apimsg->msg.err;
341 #endif /* LWIP_TCPIP_CORE_LOCKING */
342 #endif /* LWIP_NETCONN */
345 #if !LWIP_TCPIP_CORE_LOCKING
347 * Much like tcpip_apimsg, but calls the lower part of a netifapi_*
350 * @param netifapimsg a struct containing the function to call and its parameters
351 * @return error code given back by the function that was called
354 tcpip_netifapi(struct netifapi_msg* netifapimsg)
356 struct tcpip_msg msg;
358 if (sys_mbox_valid(&mbox)) {
359 err_t err = sys_sem_new(&netifapimsg->msg.sem, 0);
361 netifapimsg->msg.err = err;
365 msg.type = TCPIP_MSG_NETIFAPI;
366 msg.msg.netifapimsg = netifapimsg;
367 sys_mbox_post(&mbox, &msg);
368 sys_sem_wait(&netifapimsg->msg.sem);
369 sys_sem_free(&netifapimsg->msg.sem);
370 return netifapimsg->msg.err;
374 #else /* !LWIP_TCPIP_CORE_LOCKING */
376 * Call the lower part of a netifapi_* function
377 * This function has exclusive access to lwIP core code by locking it
378 * before the function is called.
380 * @param netifapimsg a struct containing the function to call and its parameters
381 * @return ERR_OK (only for compatibility fo tcpip_netifapi())
384 tcpip_netifapi_lock(struct netifapi_msg* netifapimsg)
387 netifapimsg->function(&(netifapimsg->msg));
389 return netifapimsg->msg.err;
391 #endif /* !LWIP_TCPIP_CORE_LOCKING */
392 #endif /* LWIP_NETIF_API */
395 * Initialize this module:
396 * - initialize all sub modules
397 * - start the tcpip_thread
399 * @param initfunc a function to call when tcpip_thread is running and finished initializing
400 * @param arg argument to pass to initfunc
403 tcpip_init(tcpip_init_done_fn initfunc, void *arg)
407 tcpip_init_done = initfunc;
408 tcpip_init_done_arg = arg;
409 if(sys_mbox_new(&mbox, TCPIP_MBOX_SIZE) != ERR_OK) {
410 LWIP_ASSERT("failed to create tcpip_thread mbox", 0);
412 #if LWIP_TCPIP_CORE_LOCKING
413 if(sys_mutex_new(&lock_tcpip_core) != ERR_OK) {
414 LWIP_ASSERT("failed to create lock_tcpip_core", 0);
416 #endif /* LWIP_TCPIP_CORE_LOCKING */
418 sys_thread_new(TCPIP_THREAD_NAME, tcpip_thread, NULL, TCPIP_THREAD_STACKSIZE, TCPIP_THREAD_PRIO);
422 * Simple callback function used with tcpip_callback to free a pbuf
423 * (pbuf_free has a wrong signature for tcpip_callback)
425 * @param p The pbuf (chain) to be dereferenced.
428 pbuf_free_int(void *p)
430 struct pbuf *q = (struct pbuf *)p;
435 * A simple wrapper function that allows you to free a pbuf from interrupt context.
437 * @param p The pbuf (chain) to be dereferenced.
438 * @return ERR_OK if callback could be enqueued, an err_t if not
441 pbuf_free_callback(struct pbuf *p)
443 return tcpip_callback_with_block(pbuf_free_int, p, 0);
447 * A simple wrapper function that allows you to free heap memory from
450 * @param m the heap memory to free
451 * @return ERR_OK if callback could be enqueued, an err_t if not
454 mem_free_callback(void *m)
456 return tcpip_callback_with_block(mem_free, m, 0);