Daniele Lacamera / PicoTCP Featured

Free (GPLv2) TCP/IP stack developed by TASS Belgium

Dependents:   lpc1768-picotcp-demo ZeroMQ_PicoTCP_Publisher_demo TCPSocket_HelloWorld_PicoTCP Pico_TCP_UDP_Test ... more

PicoTCP. Copyright (c) 2013 TASS Belgium NV.

Released under the GNU General Public License, version 2.

Different licensing models may exist, at the sole discretion of the Copyright holders.

Official homepage: http://www.picotcp.com

Bug tracker: https://github.com/tass-belgium/picotcp/issues

Development steps:

  • initial integration with mbed RTOS
  • generic mbed Ethernet driver
  • high performance NXP LPC1768 specific Ethernet driver
  • Multi-threading support for mbed RTOS
  • Berkeley sockets and integration with the New Socket API
  • Fork of the apps running on top of the New Socket API
  • Scheduling optimizations
  • Debugging/benchmarking/testing

Demo application (measuring TCP sender performance):

Import programlpc1768-picotcp-demo

A PicoTCP demo app testing the ethernet throughput on the lpc1768 mbed board.

Last commit 17 May 2013 by TASS Belgium

Files at this revision

API Documentation at this revision

Revision 97:e73b01cb3147, committed 2013-10-16

Comitter:
tass
Date:
Wed Oct 16 12:40:29 2013 +0000
Parent:
96:6d41e372ee2c
Child:
98:b0575c2cc01c
Commit message:
Issue #40 + removed ep_accepting since there is no need for it.

Changed in this revision

Socket/bsd/stack_endpoint.cpp Show annotated file Show diff for this revision Revisions of this file
modules/pico_tcp.c Show annotated file Show diff for this revision Revisions of this file 
--- a/Socket/bsd/stack_endpoint.cpp	Wed Oct 16 11:51:10 2013 +0000
+++ b/Socket/bsd/stack_endpoint.cpp	Wed Oct 16 12:40:29 2013 +0000
@@ -28,7 +28,6 @@
 Mutex *PicoTcpLock;
 Queue<void,32> *PicoTcpEvents;
 
-static struct stack_endpoint *ep_accepting;
 static Thread * serverThread = NULL;
 
 /* Testing ng blocking mechanism */
@@ -64,17 +63,12 @@
 {
   struct stack_endpoint *ep = (struct stack_endpoint *)s->priv;
   if (!ep) {
-    if (ep_accepting != NULL) {
-        ptsock_dbg("Delivering %02x to accepting socket...\n", ev);
-        ep = ep_accepting;
-    } else {
-        ptsock_dbg("WAKEUP: socket not found! ev=%04x\n", ev);
-        return;
-    }
+    ptsock_dbg("WAKEUP: socket not found! ev=%04x\n", ev);
+    return;
   }
   //if (((ep->revents & PICO_SOCK_EV_RD) == 0) && (ev & PICO_SOCK_EV_RD))
   //  printf("Activating RD\n");
-  if(!ep || !ep->s || !ep->queue)
+  if(!ep->s || !ep->queue)
   {
     ptsock_dbg("Endpoint null warning : ep=%p, ep->s=%p, ep->queue=%p\n",ep,ep->s,ep->queue);
     return;
@@ -153,10 +147,7 @@
   int ret;
   PicoTcpLock->lock();
   ret = pico_socket_listen(ep->s, queue);
-  ep_accepting = (struct stack_endpoint *) pico_zalloc(sizeof(struct stack_endpoint));
-  ep_accepting->queue = new Queue<void,1>();
-  if (!ep_accepting)
-    ret = -1;
+  
   if(ret == 0)
     ep->state = SOCK_LISTEN;
   PicoTcpLock->unlock();
@@ -188,14 +179,12 @@
 struct stack_endpoint *picotcp_accept(struct stack_endpoint *ep, struct sockaddr *_cli_addr, socklen_t *len)
 {
   int retval;
-  struct stack_endpoint *aep = ep_accepting;
+  
   struct sockaddr_in *cli_addr = (struct sockaddr_in *)_cli_addr;
-  ep_accepting = (struct stack_endpoint *) pico_zalloc(sizeof(struct stack_endpoint));
-  if (ep_accepting)
-    ep_accepting->queue = new Queue<void,1>();
-  
-  
-  if (!aep)
+  struct stack_endpoint *aep = (struct stack_endpoint *) pico_zalloc(sizeof(struct stack_endpoint));
+  if (aep)
+    aep->queue = new Queue<void,1>();
+  else
     return aep;
   
   PicoTcpLock->lock();

--- a/modules/pico_tcp.c	Wed Oct 16 11:51:10 2013 +0000
+++ b/modules/pico_tcp.c	Wed Oct 16 12:40:29 2013 +0000
@@ -27,6 +27,7 @@
 #define PICO_TCP_SYN_TO	 1000u
 #define PICO_TCP_ZOMBIE_TO 30000
 
+#define PICO_TCP_MAX_RETRANS		 10
 #define PICO_TCP_MAX_CONNECT_RETRIES 7
 
 #define PICO_TCP_LOOKAHEAD      0x00
@@ -97,7 +98,7 @@
   uint32_t size;
   uint32_t frames;
 };
-
+static void tcp_discard_all_segments(struct pico_tcp_queue *tq);
 static struct pico_frame *peek_segment(struct pico_tcp_queue *tq, uint32_t seq)
 {
   struct pico_tcp_hdr H;
@@ -1276,7 +1277,7 @@
   struct pico_frame *f = NULL;
   uint32_t limit = val - t->rto;
   if( t->sock.net && ((t->sock.state & 0xFF00) == PICO_SOCKET_STATE_TCP_ESTABLISHED
-  		|| (t->sock.state & 0xFF00) == PICO_SOCKET_STATE_TCP_CLOSE_WAIT) )
+  		|| (t->sock.state & 0xFF00) == PICO_SOCKET_STATE_TCP_CLOSE_WAIT) && t->backoff < PICO_TCP_MAX_RETRANS)
   {
 		tcp_dbg("TIMEOUT! backoff = %d\n", t->backoff);
 		/* was timer cancelled? */
@@ -1316,9 +1317,16 @@
 		t->backoff = 0;
 		add_retransmission_timer(t, 0);
 		if (t->tcpq_out.size < t->tcpq_out.max_size)
-			 t->sock.ev_pending |= PICO_SOCK_EV_WR;
+		  t->sock.ev_pending |= PICO_SOCK_EV_WR;
 		return;
 	}
+    else if(t->backoff >= PICO_TCP_MAX_RETRANS && (t->sock.state & 0xFF00) == PICO_SOCKET_STATE_TCP_ESTABLISHED )
+	{
+		// the retransmission timer, failed to get an ack for a frame, giving up on the connection
+		tcp_discard_all_segments(&t->tcpq_out);
+		if(t->sock.wakeup)
+		  t->sock.wakeup(PICO_SOCK_EV_FIN,&t->sock);
+	}
 }
 
 static void add_retransmission_timer(struct pico_socket_tcp *t, uint32_t next_ts)
@@ -2225,9 +2233,9 @@
           tcp_dbg_nagle("TCP_PUSH - NAGLE - enqueue hold failed 2\n");
           return 0;
         }
-      }
     }
   }
+      }
   /***************************************************************************/
 }