add tcpip_callback patch from Marc

src/api/tcpip.c

@@ -78,6 +78,8 @@ tcpip_thread(void *arg)
 {
   struct tcpip_msg *msg;
 
+  (void)arg;
+
   ip_init();
   udp_init();
   tcp_init();
@@ -97,9 +99,9 @@ tcpip_thread(void *arg)
       DEBUGF(TCPIP_DEBUG, ("tcpip_thread: IP packet %p\n", (void *)msg));
       ip_input(msg->msg.inp.p, msg->msg.inp.netif);
       break;
-    case TCPIP_MSG_LINK:
-      DEBUGF(TCPIP_DEBUG, ("tcpip_thread: LINK packet %p\n", (void *)msg));
-      msg->msg.inp.netif->input(msg->msg.inp.p, msg->msg.inp.netif);
+    case TCPIP_MSG_CALLBACK:
+      DEBUGF(TCPIP_DEBUG, ("tcpip_thread: CALLBACK %p\n", (void *)msg));
+      msg->msg.cb.f(msg->msg.cb.ctx);
       break;
     default:
       break;
@@ -127,19 +129,18 @@ tcpip_input(struct pbuf *p, struct netif *inp)
 }
 /*-----------------------------------------------------------------------------------*/
 err_t
-tcpip_link_input(struct pbuf *p, struct netif *inp)
+tcpip_callback(void (*f)(void *ctx), void *ctx)
 {
   struct tcpip_msg *msg;
   
   msg = memp_mallocp(MEMP_TCPIP_MSG);
   if(msg == NULL) {
-    pbuf_free(p);    
     return ERR_MEM;  
   }
   
-  msg->type = TCPIP_MSG_LINK;
-  msg->msg.inp.p = p;
-  msg->msg.inp.netif = inp;
+  msg->type = TCPIP_MSG_CALLBACK;
+  msg->msg.cb.f = f;
+  msg->msg.cb.ctx = ctx;
   sys_mbox_post(mbox, msg);
   return ERR_OK;
 }

src/include/lwip/tcp.h

@@ -265,7 +265,7 @@ struct tcp_pcb {
 #endif /* TCP_QUEUE_OOSEQ */
 
 #if LWIP_CALLBACK_API
-  /* Function to be called when more send buffer space is avaliable. */
+  /* Function to be called when more send buffer space is available. */
   err_t (* sent)(void *arg, struct tcp_pcb *pcb, u16_t space);
   
   /* Function to be called when (in-sequence) data has arrived. */

src/include/lwip/tcpip.h

@@ -38,14 +38,14 @@
 void tcpip_init(void (* tcpip_init_done)(void *), void *arg);
 void tcpip_apimsg(struct api_msg *apimsg);
 err_t tcpip_input(struct pbuf *p, struct netif *inp);
-err_t tcpip_link_input(struct pbuf *p, struct netif *inp);
+err_t tcpip_callback(void (*f)(void *ctx), void *ctx);
 
 void tcpip_tcp_timer_needed(void);
 
 enum tcpip_msg_type {
   TCPIP_MSG_API,
   TCPIP_MSG_INPUT,
-  TCPIP_MSG_LINK
+  TCPIP_MSG_CALLBACK
 };
 
 struct tcpip_msg {
@@ -57,6 +57,10 @@ struct tcpip_msg {
       struct pbuf *p;
       struct netif *netif;
     } inp;
+    struct {
+      void (*f)(void *ctx);
+      void *ctx;
+    } cb;
   } msg;
 };