Networking: Divide net_intiialize() into net_setup() and net_initialize() to solve a chicken-and-egg problem. net_setup() must be caleld before up_initialize() is called so that networking data structures are ready to register new network devices.

net_initialize() now does only timer related operations and is called AFTER up_initialize() where the timers are configured.  This is really.

include/nuttx/net/net.h

@@ -170,6 +170,50 @@ extern "C"
  * Public Function Prototypes
  ****************************************************************************/
 
+/****************************************************************************
+ * Name: net_setup
+ *
+ * Description:
+ *   This is called from the OS initialization logic at power-up reset in
+ *   order to configure networking data structures.  This is called prior
+ *   to platform-specific driver initialization so that the networking
+ *   subsystem is prepared to deal with network driver initialization
+ *   actions.
+ *
+ *   Actions performed in this initialization phase assume that base OS
+ *   facilities such as semaphores are available but this logic cannot
+ *   depend upon OS resources such as interrupts or timers which are not
+ *   yet available.
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void net_setup(void);
+
+/****************************************************************************
+ * Name: net_initialize
+ *
+ * Description:
+ *   This function is called from the OS initialization logic at power-up
+ *   reset AFTER initialization of hardware facilities such as timers and
+ *   interrupts.   This logic completes the initialization started by
+ *   net_setup().
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void net_initialize(void);
+
 /****************************************************************************
  * Critical section management.  The NuttX configuration setting
  * CONFIG_NET_NOINT indicates that uIP not called from the interrupt level.
@@ -294,23 +338,6 @@ void net_setipid(uint16_t id);
 
 int net_checksd(int fd, int oflags);
 
-/****************************************************************************
- * Name: net_initialize
- *
- * Description:
- *   This is called from the OS initialization logic at power-up reset in
- *   order to configure the networking subsystem.
- *
- * Input Parameters:
- *   None
- *
- * Returned Value:
- *   None
- *
- ****************************************************************************/
-
-void net_initialize(void);
-
 /****************************************************************************
  * Name:
  *

net/neighbor/neighbor.h

@@ -106,11 +106,34 @@ extern uint32_t g_neighbor_polltime;
  * Public Function Prototypes
  ****************************************************************************/
 
+/****************************************************************************
+ * Name: neighbor_setup
+ *
+ * Description:
+ *   Initialize Neighbor table data structures.  This function is called
+ *   prior to platform-specific driver initialization so that the networking
+ *   subsystem is prepared to deal with network driver initialization
+ *   actions.
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void neighbor_setup(void);
+
 /****************************************************************************
  * Name: neighbor_initialize
  *
  * Description:
- *  Initialize Neighbor table support
+ *  Initialize Neighbor ageing.  This function is called from the OS
+ *  initialization logic at power-up reset AFTER initialization of hardware
+ *  facilities such as timers and interrupts.  This logic completes the
+ *  initialization started by neighbor_setup.
+ *
  *
  * Input Parameters:
  *   None

net/neighbor/neighbor_initialize.c

@@ -65,10 +65,13 @@ uint32_t g_neighbor_polltime;
  ****************************************************************************/
 
 /****************************************************************************
- * Name: neighbor_initialize
+ * Name: neighbor_setup
  *
  * Description:
- *  Initialize Neighbor table support
+ *   Initialize Neighbor table data structures.  This function is called
+ *   prior to platform-specific driver initialization so that the networking
+ *   subsystem is prepared to deal with network driver initialization
+ *   actions.
  *
  * Input Parameters:
  *   None
@@ -78,7 +81,7 @@ uint32_t g_neighbor_polltime;
  *
  ****************************************************************************/
 
-void neighbor_initialize(void)
+void neighbor_setup(void)
 {
   int i;
 
@@ -86,7 +89,28 @@ void neighbor_initialize(void)
     {
       g_neighbors[i].ne_time = NEIGHBOR_MAXTIME;
     }
+}
 
+/****************************************************************************
+ * Name: neighbor_initialize
+ *
+ * Description:
+ *  Initialize Neighbor ageing.  This function is called from the OS
+ *  initialization logic at power-up reset AFTER initialization of hardware
+ *  facilities such as timers and interrupts.  This logic completes the
+ *  initialization started by neighbor_setup.
+ *
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void neighbor_initialize(void);
+{
   /* Initialize the time of the last poll */
 
    g_neighbor_polltime = clock_systimer();

net/net_initialize.c

@@ -1,7 +1,7 @@
 /****************************************************************************
  * net/net_sockets.c
  *
- *   Copyright (C) 2007-2009, 2011-2014 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2009, 2011-2015 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -83,11 +83,19 @@
  ****************************************************************************/
 
 /****************************************************************************
- * Name: net_initialize
+ * Name: net_setup
  *
  * Description:
  *   This is called from the OS initialization logic at power-up reset in
- *   order to configure the networking subsystem.
+ *   order to configure networking data structures.  This is called prior
+ *   to platform-specific driver initialization so that the networking
+ *   subsystem is prepared to deal with network driver initialization
+ *   actions.
+ *
+ *   Actions performed in this initialization phase assume that base OS
+ *   facilities such as semaphores are available but this logic cannot
+ *   depend upon OS resources such as interrupts or timers which are not
+ *   yet available.
  *
  * Input Parameters:
  *   None
@@ -97,7 +105,7 @@
  *
  ****************************************************************************/
 
-void net_initialize(void)
+void net_setup(void)
 {
   /* Initialize the locking facility */
 
@@ -108,9 +116,9 @@ void net_initialize(void)
   arp_reset();
 
 #ifdef CONFIG_NET_IPv6
-  /* Initialize the Neighbor Table */
+  /* Initialize the Neighbor Table data structures */
 
-  neighbor_initialize();
+  neighbor_setup();
 #endif
 
 #ifdef CONFIG_NET_IOB
@@ -174,6 +182,32 @@ void net_initialize(void)
 
   netdev_seminit();
 #endif
+}
+
+/****************************************************************************
+ * Name: net_initialize
+ *
+ * Description:
+ *   This function is called from the OS initialization logic at power-up
+ *   reset AFTER initialization of hardware facilities such as timers and
+ *   interrupts.   This logic completes the initialization started by
+ *   net_setup().
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void net_initialize(void)
+{
+#ifdef CONFIG_NET_IPv6
+  /* Configure Neighbor Table ageing */
+
+  neighbor_initialize();
+#endif
 
   /* Initialize the periodic ARP timer */
 

sched/init/os_start.c

@@ -466,11 +466,15 @@ void os_start(void)
 #endif
 
 #ifdef CONFIG_NET
-  /* Initialize the networking systeming.  This must be done prior to
-   * registering network drivers.
+  /* Initialize the networking system.  Network initialization is
+   * performed in two steps:  (1) net_setup() initializes static
+   * configuration of the network support.  This must be done prior
+   * to registering network drivers by up_initialize().  This step
+   * cannot require upon any hardware-depending features such as
+   * timers or interrupts.
    */
 
-  net_initialize();
+  net_setup();
 #endif
 
   /* The processor specific details of running the operating system
@@ -481,6 +485,14 @@ void os_start(void)
 
   up_initialize();
 
+#ifdef CONFIG_NET
+  /* Complete initialization the networking system now that interrupts
+   * and timers have been configured by up_initialize().
+   */
+
+  net_initialize();
+#endif
+
 #ifdef CONFIG_MM_SHM
   /* Initialize shared memory support */