Verified basic client-side network functionality

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@373 42af7a65-404d-4744-a932-0658087f49c3
2007-11-06 19:58:14 +00:00 · 2007-11-06 19:58:14 +00:00 · db8aff6778
commit db8aff6778
parent ddeb703501
16 changed files with 583 additions and 107 deletions
--- a/5
+++ b/5
@ -199,7 +199,7 @@
 	* examples/nsh/: Add cp, rm, rmdir, set, unset commands. echo will now print
 	  environment variables.

-0.3.0 2007-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
+0.3.0 2007-11-06 Gregory Nutt <spudmonkey@racsa.co.cr>

 	* Imported uIP into the tree (see
 	   http://www.sics.se/~adam/uip/index.php/Main_Page)
@ -215,4 +215,7 @@
 	* Added listen() and accept()
 	* Added DM90x0 ethernet driver
 	* ARP timer is now built into the network layer
+	* Basic client functionality verified: socket(), bind(), connect(), recv(), send().
+
+0.3.1 2007-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>

--- a/Documentation/NuttX.html
+++ b/Documentation/NuttX.html
@ -8,7 +8,7 @@
  <tr align="center" bgcolor="#e4e4e4">
    <td>
      <h1><big><font color="#3c34ec"><i>NuttX RTOS</i></font></big></h1>
-      <p>Last Updated: September 8, 2007</p>
+      <p>Last Updated: November 6, 2007</p>
    </td>
  </tr>
 </table>
@ -183,13 +183,28 @@
 </table>

 <p>
-   The 11th release of NuttX (nuttx-0.2.8) is available for download
+   The 12th release of NuttX (nuttx-0.3.0) is available for download
   from the <a href="http://sourceforge.net/project/showfiles.php?group_id=189573">SourceForge</a>
   website.
   The change log associated with the release is available <a href="#currentrelease">here</a>.
   Unreleased changes after this release are avalable in CVS.
   These unreleased changes are listed <a href="#pendingchanges">here</a>.
 </p>
+<p>
+   NuttX 30.3.0 includes the initial integration of a network subsystem and
+   a TCP/IP stack based on <a href="http://www.sics.se/~adam/uip/index.php/Main_Page">uIP</a>.
+   Also included is a device driver for the Davicom DM90x0 ethernet controller.
+</p>
+</p>
+  This integration is very preliminary.  Only a small portion of the
+  network functionality has been integrated and there are a number of
+  open issues.  The network subsystem is pre-alpha this point in time.
+  I expect that it will stabilize and mature over the next few releases.
+</p>
+<p>
+  The baseline functionality of NuttX continues to mature and remains at
+  post-beta (as long as the network is not used).
+</p>

 <table width ="100%">
  <tr bgcolor="#e4e4e4">
@ -251,14 +266,14 @@
    </p>
    <p>
      <b>STATUS:</b>
-        This port is in progress and should be available in the nuttx-0.2.7 release.
+        Initial coding of this port code complete but has not yet been verified.
    </p>
  </td>
 </tr>
 <tr>
  <td valign="top"><img src="favicon.ico"></td>
  <td bgcolor="#5eaee1">
-    <b>ARM9EJS</b>.
+    <b>ARM926EJS</b>.
  </td>
 </tr>
 <tr>
@ -273,7 +288,7 @@
    </p>
    <p>
      <b>STATUS:</b>
-      This port is code complete but totally untested due to hardware issues with my OSD.
+        This port is complete and verified.
    </p>
   </td>
 </tr>
@ -329,7 +344,7 @@ is available that be used to build a NuttX-compatible arm-elf toolchain.</blockq
 </table>

 <ul>
-<p><b>C5471 (Arm7)</b>
+<p><b>C5471 (ARM7)</b>
  The build for this ARM7 target that includes most of the OS features and
  a broad range of OS tests.  The size of this executable as given by the
  Linux <tt>size</tt> command is (3/9/07):
@ -338,6 +353,14 @@ is available that be used to build a NuttX-compatible arm-elf toolchain.</blockq
   text    data     bss     dec     hex filename
  53272     428    3568   57268    dfb4 nuttx
 </pre>
+<p><b>DM320 (ARM9)</b>
+  This build for the ARM9 target includes a signficant subset of OS
+  features, ethernet driver and full TCP/IP stack (via uIP).
+</p>
+<pre>
+   text    data     bss     dec     hex filename
+  51368     296    6072   57736    e188 nuttx
+</pre>
 <p><b>87C52</b>
  A reduced functionality OS test for the 8052 target requires only
  about 18-19Kb:
@ -589,17 +612,7 @@ Other memory:
 	  __FILE__and __LINE__ (not tested)
 	* examples/ostest/barrier.c: Don't call usleep() when signals are
 	  disabled.
-</pre></ul>

-<table width ="100%">
-  <tr bgcolor="#e4e4e4">
-  <td>
-    <a name="currentrelease">ChangeLog for Current Release</a>
-  </td>
-  </tr>
-</table>
-
-<pre><ul>
 0.2.8 2007-07-02 Gregory Nutt <spudmonkey@racsa.co.cr>
 	* tools/Makefile.mkconfig: Under Cygwin, executable has a different name
 	* tools/mkdeps.sh & arch/arm/src/Makefile: Corrected a problem makeing dependencies
@ -626,13 +639,13 @@ Other memory:
 <table width ="100%">
  <tr bgcolor="#e4e4e4">
  <td>
-    <a name="pendingchanges">Unreleased Changes</a>
+    <a name="currentrelease">ChangeLog for Current Release</a>
  </td>
  </tr>
 </table>

 <pre><ul>
-0.3.0 2007-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
+0.3.0 2007-11-06 Gregory Nutt <spudmonkey@racsa.co.cr>

 	* Imported uIP into the tree (see
 	   http://www.sics.se/~adam/uip/index.php/Main_Page)
@ -648,6 +661,19 @@ Other memory:
 	* Added listen() and accept()
 	* Added DM90x0 ethernet driver
 	* ARP timer is now built into the network layer
+	* Basic client functionality verified: socket(), bind(), connect(), recv(), send().
+</pre></ul>
+
+<table width ="100%">
+  <tr bgcolor="#e4e4e4">
+  <td>
+    <a name="pendingchanges">Unreleased Changes</a>
+  </td>
+  </tr>
+</table>
+
+<pre><ul>
+0.3.1 2007-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
 </pre></ul>

 <table width ="100%">
--- a/23
+++ b/23
@ -1,12 +1,23 @@
-nuttx-0.2.8
+nuttx-0.3.0
 ^^^^^^^^^^^

-This is the 11th release of NuttX.  This release (1) corrects important bugs
-in opendir and realloc, (2) adds support for environment variables, (3) adds
-several new C library interfaces, and (4) extends several example programs.
+This is the 12th release of NuttX.  This release includes the initial
+integration of a network subsystem and the uIP TCP/IP stack into NuttX
+(see http://www.sics.se/~adam/uip/index.php/Main_Page).  Also included
+is a device driver for the Davicom DM90x0 ethernet controller.
+
+This integration is very preliminary.  Only a small portion of the
+network functionality has been integrated and there are a number of
+open issues (see the TODO file).  The network subsystem is pre-alpha
+at this point in time.  I expect that it will stabilize and mature
+over the next few releases.
+
+The baseline functionality of NuttX continues to mature and remains at
+post-beta (as long as the network is not used).

 See the ChangeLog for a complete list of changes.

-This release has been verified only on the Linux user-mode platform.
+This release has been verified only on the Neuros OSD (DM320 ARM9)
+platform using the DM90x0 driver.

-This tarball contains a complete CVS snapshot from July 2, 2007.
+This tarball contains a complete CVS snapshot from November 6, 2007.
--- a/51
+++ b/51
@ -29,7 +29,39 @@ o C++ Support
 - Need to call static constructors

 o Network
- Finish integratin of uIP
+- Did not implement send() and sendto() timeouts.  Option is setable via setsockopt,
+  but is not implemented.
+- netutils/webserver netutils/telnetd (and maybe others) are seriously broken.
+  Need to be re-written to use listen() and accept()
+- Should implement SOCK_RAW
+- listen() and accept() are untested.
+- accept() and recvfrom() need to return connection address
+- Performance Improvements (uIP is not very fast):
+- Improve performance by queing TX operations
+  Add simple buffer management.  CONFIG_NET_BUFFERS
+  (1) On write, queue buffer for output get a new buffer for the socket (waiting if
+      nececcesary
+  (2) Copy buffer structure into uip_driver_structure when driver requests write
+      data
+- Improve performance by stimulating the driver to accept new TX data before the
+  next polling interval.
+
+  Add a txail callback into driver to eliminate send delays.  Since we want to
+  support multiple network devices, this means we will have to add some infrastructure
+  to map to device.
+- Break uip_interrupt() (in uip.c) into several functions.
+- uIP polling issues:
+  (1) uIP expects a single driver to poll at a 500ms interval (dm90x0 currently
+      polls a 5sec).
+  (2) Current logic will not support multiple ethernet drivers.  Each driver should
+      poll on TCP connections connect on the network supported by the driver; UDP
+      polling should respond with TX data only if the UDP packet is intended for the
+      the network supported by the driver.
+  (3) If there were multiple drivers, polling would occur at double the rate.
+- TCP Bug:
+  When TCP data is received with no read in place, it appears that uIP ACKs the data
+  even though it was not taken accepted.  We must either (1) buffer incoming data, or
+  (2) not ACK it so that it will be re-sent.

 o USB
 - Implement USB device support
@ -44,23 +76,6 @@ o File system
 - Add chmod(), truncate().
 - FAT32: long file names

-o Network
- Did not implement send() and sendto() timeouts.  Option is setable via setsockopt,
-  but is not implemented.
- netutils/webserver netutils/telnetd (and maybe others) are seriously broken.
- Should implement SOCK_RAW
- Performance Improvements (uIP is not very fast):
-
-  Add simple buffer management.  CONFIG_NET_BUFFERS
-  (1) On write, queue buffer for output get a new buffer for the socket (waiting if
-      nececcesary
-  (2) Copy buffer structure into uip_driver_structure when driver requests write
-      data
-
-  Add a txail callback into driver to eliminate send delays.  Since we want to
-  support multiple network devices, this means we will have to add some infrastructure
-  to map to device.
-
 o Documentation
 - Document fs/ & driver/ logic
 - Document C-library APIs
--- a/arch/arm/src/common/up_udelay.c
+++ b/arch/arm/src/common/up_udelay.c
@ -44,8 +44,9 @@
 * Definitions
 ****************************************************************************/

-#define CONFIG_BOARD_LOOPSPERUSEC   ((CONFIG_BOARD_LOOPSPERMSEC+500)/1000)
-#define CONFIG_BOARD_LOOPSPER10USEC ((CONFIG_BOARD_LOOPSPERMSEC+50)/100)
+#define CONFIG_BOARD_LOOPSPER100USEC ((CONFIG_BOARD_LOOPSPERMSEC+5)/10)
+#define CONFIG_BOARD_LOOPSPER10USEC  ((CONFIG_BOARD_LOOPSPERMSEC+50)/100)
+#define CONFIG_BOARD_LOOPSPERUSEC    ((CONFIG_BOARD_LOOPSPERMSEC+500)/1000)

 /****************************************************************************
 * Private Types
@ -85,48 +86,43 @@

 void up_udelay(unsigned int microseconds)
 {
-  volatile int    i;
-  volatile int    j;
-  register uint32 loops;
+  volatile int i;

-  /* The value of microseconds should be less than 1000.  If not, then we
-   * will perform millescond delays until it is.
+  /* We'll do this a little at a time because we expect that the
+   * CONFIG_BOARD_LOOPSPERUSEC is very inaccurate during to truncation in
+   * the divisions of its calculation.  We'll use the largest values that
+   * we can in order to prevent significant error buildup in the loops.
   */

  while (microseconds > 1000)
    {
-      for (j = 0; j < CONFIG_BOARD_LOOPSPERMSEC; j++)
+      for (i = 0; i < CONFIG_BOARD_LOOPSPERMSEC; i++)
        {
        }
      microseconds -= 1000;
    }

-  /* The numerator of the 'loops' below will overflow if CONFIG_BOARD_LOOPSPERMSEC
-   * is larger than (4*1024*1024*1024 - 500)/999 = 4,299,266.06
-   */
-
-#if CONFIG_BOARD_LOOPSPERMSEC >= 4299266
-  while (microseconds > 500)
+  while (microseconds > 100)
    {
-      for (j = 0; j < ((CONFIG_BOARD_LOOPSPERMSEC+1)/2); j++)
+      for (i = 0; i < CONFIG_BOARD_LOOPSPER100USEC; i++)
        {
        }
-      microseconds -= 500;
+      microseconds -= 100;
    }
-#endif

-  /* The overflow could still occur if CONFIG_BOARD_LOOPSPERMSEC is larger than
-   * (4*1024*1024*1024 - 500)/499 = 8,607,147.89
-   */
-
-#if CONFIG_BOARD_LOOPSPERMSEC >= 8607147
-# warning "Overflow in loops calculation is possible"
-#endif
-
-  /* Caculate the number of loops need to produce the required usec delay */
-
-  loops = (CONFIG_BOARD_LOOPSPERMSEC * microseconds + 500) / 1000;
-  for (j = 0; j < loops; j++)
+  while (microseconds > 10)
    {
+      for (i = 0; i < CONFIG_BOARD_LOOPSPER10USEC; i++)
+        {
+        }
+      microseconds -= 10;
+    }
+
+  while (microseconds > 0)
+    {
+      for (i = 0; i < CONFIG_BOARD_LOOPSPERUSEC; i++)
+        {
+        }
+      microseconds--;
    }
 }
--- a/arch/sim/src/up_uipdriver.c
+++ b/arch/sim/src/up_uipdriver.c
@ -201,7 +201,7 @@ void uipdriver_loop(void)
  else if (timer_expired(&g_periodic_timer))
    {
      timer_reset(&g_periodic_timer);
-      uip_poll(&g_sim_dev, sim_uiptxpoll, UIP_TIMER);
+      uip_poll(&g_sim_dev, sim_uiptxpoll, UIP_DRV_TIMER);
    }
  sched_unlock();
 }
--- a/configs/ntosd-dm320/README.txt
+++ b/configs/ntosd-dm320/README.txt
@ -0,0 +1,11 @@
+README
+^^^^^^
+
+The configuration netconfig may be used instead of the
+default configuration (defconfig).  This configuration
+enables networking using the OSDs DM9000A ethernet
+interface.
+
+Disclaimer:  The NuttX network subsystem is a "work in
+progress" at this time and minimal network functionality
+should be expected.
--- a/configs/ntosd-dm320/netconfig
+++ b/configs/ntosd-dm320/netconfig
@ -0,0 +1,338 @@
+############################################################
+# defconfig
+#
+#   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name Gregory Nutt nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################
+#
+# architecture selection
+#
+# CONFIG_ARCH - identifies the arch subdirectory and, hence, the
+#   processor architecture.
+# CONFIG_ARCH_name - for use in C code.  This identifies the
+#   particular chip or SoC that the architecture is implemented
+#   in.
+# CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
+# CONFIG_ARCH_CHIP_name - For use in C code
+# CONFIG_ARCH_BOARD - identifies the configs subdirectory and, hence,
+#   the board that supports the particular chip or SoC.
+# CONFIG_ARCH_BOARD_name - for use in C code
+# CONFIG_ENDIAN_BIG - define if big endian (default is little endian)
+# CONFIG_BOARD_LOOPSPERMSEC - for delay loops
+# CONFIG_DRAM_SIZE - Describes the installed DRAM.
+# CONFIG_DRAM_START - The start address of DRAM (physical)
+# CONFIG_DRAM_VSTART - The startaddress of DRAM (virtual)
+# CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions
+#
+CONFIG_ARCH=arm
+CONFIG_ARCH_ARM=y
+CONFIG_ARCH_CHIP=dm320
+CONFIG_ARCH_CHIP_DM320=y
+CONFIG_ARCH_BOARD=ntosd-dm320
+CONFIG_ARCH_BOARD_NTOSD_DM320=y
+CONFIG_BOARD_LOOPSPERMSEC=16945
+CONFIG_DRAM_SIZE=0x01000000
+CONFIG_DRAM_START=0x01000000
+CONFIG_DRAM_VSTART=0x00000000
+CONFIG_DRAM_NUTTXENTRY=0x01008000
+CONFIG_ARCH_STACKDUMP=y
+
+#
+# DM320 specific device driver settings
+#
+# CONFIG_UARTn_SERIAL_CONSOLE - selects the UARTn for the
+#   console and ttys0 (default is the UART0).
+# CONFIG_UARTn_RXBUFSIZE - Characters are buffered as received.
+#   This specific the size of the receive buffer
+# CONFIG_UARTn_TXBUFSIZE - Characters are buffered before
+#   being sent.  This specific the size of the transmit buffer
+# CONFIG_UARTn_BAUD - The configure BAUD of the UART.  Must be
+# CONFIG_UARTn_BITS - The number of bits.  Must be either 7 or 8.
+# CONFIG_UARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity
+# CONFIG_UARTn_2STOP - Two stop bits
+#
+CONFIG_UART0_SERIAL_CONSOLE=y
+CONFIG_UART1_SERIAL_CONSOLE=n
+CONFIG_UART0_TXBUFSIZE=256
+CONFIG_UART1_TXBUFSIZE=256
+CONFIG_UART0_RXBUFSIZE=256
+CONFIG_UART1_RXBUFSIZE=256
+CONFIG_UART0_BAUD=115200
+CONFIG_UART1_BAUD=115200
+CONFIG_UART0_BITS=8
+CONFIG_UART1_BITS=8
+CONFIG_UART0_PARITY=0
+CONFIG_UART1_PARITY=0
+CONFIG_UART0_2STOP=0
+CONFIG_UART1_2STOP=0
+
+#
+# General OS setup
+#
+# CONFIG_EXAMPLE - identifies the subdirectory in examples
+#   that will be used in the build
+# CONFIG_DEBUG - enables built-in debug options
+# CONFIG_DEBUG_VERBOSE - enables verbose debug output
+# CONFIG_MM_REGIONS - If the architecture includes multiple
+#   regions of memory to allocate from, this specifies the
+#   number of memory regions that the memory manager must
+#   handle and enables the API mm_addregion(start, end);
+# CONFIG_HAVE_LOWPUTC - architecture supports low-level, boot
+#   time console output
+# CONFIG_TICKS_PER_MSEC - The default system timer is 100Hz
+#   or TICKS_PER_MSEC=10.  This setting may be defined to
+#   inform NuttX that the processor hardware is providing
+#   system timer interrupts at some interrupt interval other
+#   than 10 msec.
+# CONFIG_RR_INTERVAL - The round robin timeslice will be set
+#   this number of milliseconds;  Round robin scheduling can
+#   be disabled by setting this value to zero.
+# CONFIG_SCHED_INSTRUMENTATION - enables instrumentation in 
+#   scheduler to monitor system performance
+# CONFIG_TASK_NAME_SIZE - Spcifies that maximum size of a
+#   task name to save in the TCB.  Useful if scheduler
+#   instrumentation is selected.  Set to zero to disable.
+# CONFIG_START_YEAR, CONFIG_START_MONTH, CONFIG_START_DAY -
+#   Used to initialize the internal time logic.
+# CONFIG_JULIAN_TIME - Enables Julian time conversions
+# CONFIG_DEV_CONSOLE - Set if architecture-specific logic
+#   provides /dev/console.  Enables stdout, stderr, stdin.
+#
+#CONFIG_EXAMPLE=uip
+CONFIG_EXAMPLE=nettest
+CONFIG_DEBUG=n
+CONFIG_DEBUG_VERBOSE=n
+CONFIG_MM_REGIONS=1
+CONFIG_ARCH_LOWPUTC=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_INSTRUMENTATION=n
+CONFIG_TASK_NAME_SIZE=0
+CONFIG_START_YEAR=2007
+CONFIG_START_MONTH=2
+CONFIG_START_DAY=13
+CONFIG_JULIAN_TIME=n
+CONFIG_DEV_CONSOLE=y
+
+#
+# The following can be used to disable categories of
+# APIs supported by the OS.  If the compiler supports
+# weak functions, then it should not be necessary to
+# disable functions unless you want to restrict usage
+# of those APIs.
+#
+# There are certain dependency relationships in these
+# features.
+#
+# o mq_notify logic depends on signals to awaken tasks
+#   waiting for queues to become full or empty.
+# o pthread_condtimedwait() depends on signals to wake
+#   up waiting tasks.
+#
+CONFIG_DISABLE_CLOCK=n
+CONFIG_DISABLE_POSIX_TIMERS=n
+CONFIG_DISABLE_PTHREAD=n
+CONFIG_DISABLE_SIGNALS=n
+CONFIG_DISABLE_MQUEUE=n
+CONFIG_DISABLE_MOUNTPOINT=y
+CONFIG_DISABLE_ENVIRON=y
+
+#
+# Misc libc settings
+#
+# CONFIG_NOPRINTF_FIELDWIDTH - sprintf-related logic is a
+#   little smaller if we do not support fieldwidthes
+#
+CONFIG_NOPRINTF_FIELDWIDTH=n
+
+#
+# Allow for architecture optimized implementations
+#
+# The architecture can provide optimized versions of the
+# following to improve sysem performance
+#
+CONFIG_ARCH_MEMCPY=n
+CONFIG_ARCH_MEMCMP=n
+CONFIG_ARCH_MEMMOVE=n
+CONFIG_ARCH_MEMSET=n
+CONFIG_ARCH_STRCMP=n
+CONFIG_ARCH_STRCPY=n
+CONFIG_ARCH_STRNCPY=n
+CONFIG_ARCH_STRLEN=n
+CONFIG_ARCH_BZERO=n
+CONFIG_ARCH_KMALLOC=n
+CONFIG_ARCH_KZMALLOC=n
+CONFIG_ARCH_KFREE=n
+
+#
+# General build options
+#
+# CONFIG_RRLOAD_BINARY - make the rrload binary format used with
+#   BSPs from www.ridgerun.com
+#
+CONFIG_RRLOAD_BINARY=n
+
+#
+# Sizes of configurable things (0 disables)
+#
+# CONFIG_MAX_TASKS - The maximum number of simultaneously
+#   active tasks.  This value must be a power of two.
+# CONFIG_MAX_TASK_ARGS - This controls the maximum number of
+#   of parameters that a task may receive (i.e., maxmum value
+#   of 'argc')
+# CONFIG_NPTHREAD_KEYS - The number of items of thread-
+#   specific data that can be retained
+# CONFIG_NFILE_DESCRIPTORS - The maximum number of file
+#   descriptors (one for each open)
+# CONFIG_NFILE_STREAMS - The maximum number of streams that
+#   can be fopen'ed
+# CONFIG_NAME_MAX - The maximum size of a file name.
+# CONFIG_STDIO_BUFFER_SIZE - Size of the buffer to allocate
+#   on fopen. (Only if CONFIG_NFILE_STREAMS > 0)
+# CONFIG_NUNGET_CHARS - Number of characters that can be
+#   buffered by ungetc() (Only if CONFIG_NFILE_STREAMS > 0)
+# CONFIG_PREALLOC_MQ_MSGS - The number of pre-allocated message
+#   structures.  The system manages a pool of preallocated
+#   message structures to minimize dynamic allocations
+# CONFIG_MQ_MAXMSGSIZE - Message structures are allocated with
+#   a fixed payload size given by this settin (does not include
+#   other message structure overhead.
+# CONFIG_MAX_WDOGPARMS - Maximum number of parameters that
+#   can be passed to a watchdog handler
+# CONFIG_PREALLOC_WDOGS - The number of pre-allocated watchdog
+#   structures.  The system manages a pool of preallocated
+#   watchdog structures to minimize dynamic allocations
+# CONFIG_PREALLOC_TIMERS - The number of pre-allocated POSIX
+#   timer structures.  The system manages a pool of preallocated
+#   timer structures to minimize dynamic allocations.  Set to
+#   zero for all dynamic allocations.
+#
+CONFIG_MAX_TASKS=64
+CONFIG_MAX_TASK_ARGS=4
+CONFIG_NPTHREAD_KEYS=4
+CONFIG_NFILE_DESCRIPTORS=32
+CONFIG_NFILE_STREAMS=16
+CONFIG_NAME_MAX=32
+CONFIG_STDIO_BUFFER_SIZE=1024
+CONFIG_NUNGET_CHARS=2
+CONFIG_PREALLOC_MQ_MSGS=32
+CONFIG_MQ_MAXMSGSIZE=32
+CONFIG_MAX_WDOGPARMS=4
+CONFIG_PREALLOC_WDOGS=32
+CONFIG_PREALLOC_TIMERS=8
+
+#
+# TCP/IP and UDP support via uIP
+# CONFIG_NET - Enable or disable all network features
+# CONFIG_NET_IPv6 - Build in support for IPv6
+# CONFIG_NSOCKET_DESCRIPTORS - Maximum number of socket descriptors per task/thread.
+# CONFIG_NET_MAX_CONNECTIONS - Maximum number of TCP connections (all tasks)
+# CONFIG_NET_MAX_LISTENPORTS - Maximum number of listening TCP ports (all tasks)
+# CONFIG_NET_SOCKOPTS - Enable or disable support for socket options
+# CONFIG_NET_BUFFER_SIZE - uIP buffer size
+# CONFIG_NET_LOGGING - Logging on or off
+# CONFIG_NET_UDP - UDP support on or off
+# CONFIG_NET_UDP_CHECKSUMS - UDP checksums on or off
+# CONFIG_NET_UDP_CONNS - The maximum amount of concurrent UDP connections
+# CONFIG_NET_STATISTICS - uIP statistics on or off
+# CONFIG_NET_PINGADDRCONF - Use "ping" packet for setting IP address
+# CONFIG_NET_RECEIVE_WINDOW - The size of the advertised receiver's window
+# CONFIG_NET_ARPTAB_SIZE - The size of the ARP table
+# CONFIG_NET_BROADCAST - Broadcast support
+# CONFIG_NET_LLH_LEN - The link level header length
+# CONFIG_NET_FWCACHE_SIZE - number of packets to remember when looking for duplicates
+CONFIG_NET=y
+CONFIG_NET_IPv6=n
+CONFIG_NSOCKET_DESCRIPTORS=8
+CONFIG_NET_MAX_CONNECTIONS=40
+CONFIG_NET_MAX_LISTENPORTS=40
+CONFIG_NET_SOCKOPTS=y
+CONFIG_NET_BUFFER_SIZE=420
+CONFIG_NET_LOGGING=y
+CONFIG_NET_UDP=y
+CONFIG_NET_UDP_CHECKSUMS=y
+#CONFIG_NET_UDP_CONNS=10
+CONFIG_NET_STATISTICS=y
+#CONFIG_NET_PINGADDRCONF=0
+#CONFIG_NET_RECEIVE_WINDOW=
+#CONFIG_NET_ARPTAB_SIZE=8
+CONFIG_NET_BROADCAST=n
+#CONFIG_NET_LLH_LEN=14
+#CONFIG_NET_FWCACHE_SIZE=2
+
+#
+# UIP Network Utilities
+# CONFIG_NET_DHCP_LIGHT - Reduces size of DHCP
+# CONFIG_NET_RESOLV_ENTRIES - Number of resolver entries
+CONFIG_NET_DHCP_LIGHT=n
+CONFIG_NET_RESOLV_ENTRIES=4
+
+#
+# Settings for examples/nettest
+CONFIG_EXAMPLE_NETTEST_IPADDR=(10<<24|0<<16|0<<8|2)
+CONFIG_EXAMPLE_NETTEST_DRIPADDR=(10<<24|0<<16|0<<8|1)
+CONFIG_EXAMPLE_NETTEST_NETMASK=(255<<24|255<<16|255<<8|0)
+CONFIG_EXAMPLE_NETTEST_CLIENTIP=(10<<24|0<<16|0<<8|1)
+
+#
+# DM90x0 Driver Settings
+CONFIG_NET_DM90x0=y
+CONFIG_DM9X_NINTERFACES=1
+CONFIG_DM9X_STATS=1
+CONFIG_DM9X_BASE=0xd0000300
+CONFIG_DM9X_IRQ=27
+CONFIG_DM9X_BUSWIDTH8=n
+CONFIG_DM9X_BUSWIDTH16=y
+CONFIG_DM9X_BUSWIDTH32=n
+CONFIG_DM9X_CHECKSUM=n
+CONFIG_DM9X_ETRANS=n
+
+#
+# Stack and heap information
+#
+# CONFIG_BOOT_FROM_FLASH - Some configurations support XIP
+#   operation from FLASH.
+# CONFIG_CUSTOM_STACK - The up_ implementation will handle
+#   all stack operations outside of the nuttx model.
+# CONFIG_STACK_POINTER - The initial stack pointer (arm7tdmi only)
+# CONFIG_PROC_STACK_SIZE - The size of the initial stack
+# CONFIG_PTHREAD_STACK_MIN - Minimum pthread stack size
+# CONFIG_PTHREAD_STACK_DEFAULT - Default pthread stack size
+# CONFIG_HEAP_BASE - The beginning of the heap
+# CONFIG_HEAP_SIZE - The size of the heap
+#
+CONFIG_BOOT_FROM_FLASH=n
+CONFIG_CUSTOM_STACK=n
+CONFIG_STACK_POINTER=
+CONFIG_PROC_STACK_SIZE=4096
+CONFIG_PTHREAD_STACK_MIN=256
+CONFIG_PTHREAD_STACK_DEFAULT=4096
+CONFIG_HEAP_BASE=
+CONFIG_HEAP_SIZE=
--- a/configs/sim/README.txt
+++ b/configs/sim/README.txt
@ -0,0 +1,9 @@
+README
+^^^^^^
+
+The configuration netconfig may be used instead of the
+default configuration (defconfig).  This configuration
+enables networking using the network TAP device.
+
+The NuttX network is not, however, functional on the TAP
+device yet.
--- a/drivers/net/dm90x0.c
+++ b/drivers/net/dm90x0.c
@ -1074,7 +1074,7 @@ static void dm9x_txdone(struct dm9x_driver_s *dm9x)

  /* Then poll uIP for new XMIT data */

-  (void)uip_poll(&dm9x->dm_dev, dm9x_uiptxpoll, UIP_POLL);
+  (void)uip_poll(&dm9x->dm_dev, dm9x_uiptxpoll, UIP_DRV_POLL);
 }

 /****************************************************************************
@ -1231,7 +1231,7 @@ static void dm9x_txtimeout(int argc, uint32 arg, ...)

  /* Then poll uIP for new XMIT data */

-  (void)uip_poll(&dm9x->dm_dev, dm9x_uiptxpoll, UIP_POLL);
+  (void)uip_poll(&dm9x->dm_dev, dm9x_uiptxpoll, UIP_DRV_POLL);
 }

 /****************************************************************************
@ -1275,7 +1275,7 @@ static void dm9x_polltimer(int argc, uint32 arg, ...)
    {
      /* If so, poll uIP for new XMIT data */

-      (void)uip_poll(&dm9x->dm_dev, dm9x_uiptxpoll, UIP_TIMER);
+      (void)uip_poll(&dm9x->dm_dev, dm9x_uiptxpoll, UIP_DRV_TIMER);
    }

  /* Setup the watchdog poll timer again */
--- a/examples/nettest/nettest-server.c
+++ b/examples/nettest/nettest-server.c
@ -55,6 +55,9 @@
 void recv_server(void)
 {
  struct sockaddr_in myaddr;
+#ifdef NETTEST_HAVE_SOLINGER
+  struct linger ling;
+#endif
  char buffer[1024];
  int listensd;
  int acceptsd;
@ -82,11 +85,11 @@ void recv_server(void)
  optval = 1;
  if (setsockopt(listensd, SOL_SOCKET, SO_REUSEADDR, (void*)&optval, sizeof(int)) < 0)
    {
-      message("server: setsockopt failure: %d\n", errno);
+      message("server: setsockopt SO_REUSEADDR failure: %d\n", errno);
      exit(1);
    }

-  /* Bind the TCP socket to a local address */
+  /* Bind the socket to a local address */

  myaddr.sin_family      = AF_INET;
  myaddr.sin_port        = HTONS(PORTNO);
@ -118,6 +121,18 @@ void recv_server(void)
    }
  message("server: Connection accepted -- receiving\n");

+  /* Configure to "linger" until all data is sent when the socket is closed */
+
+#ifdef NETTEST_HAVE_SOLINGER
+    ling.l_onoff  = 1;
+    ling.l_linger = 30;     /* timeout is seconds */
+    if (setsockopt(acceptsd, SOL_SOCKET, SO_LINGER, &ling, sizeof(struct linger)) < 0)
+      {
+      message("server: setsockopt SO_LINGER failure: %d\n", errno);
+      exit(1);
+    }
+#endif
+
 #ifdef CONFIG_NETTEST_PERFORMANCE
  /* Then receive data forever */

@ -179,6 +194,17 @@ void recv_server(void)
        }
    }

+#ifdef CONFIG_NETTEST_HOST
+  /* At present, data received by the target before it is completed the
+   * the write opertion and started the read operation results in a failure
+   * (the data is not received, but it is ACKed).  This will have to be
+   * fixed.
+   */
+
+# warning "FIXME: This should not be necessary"
+  sleep(10);
+#endif
+
  /* Then send the same data back to the client */

  nbytessent = send(acceptsd, buffer, totalbytesread, 0);
@ -191,6 +217,15 @@ void recv_server(void)
    }
  message("server: Sent %d bytes\n", nbytessent);

+  /* If this platform only does abortive disconnects, then wait a bit to get the
+   * client side a change to receive the data.
+   */
+
+#if 1 /* Do it for all platforms */
+  message("server: Wait before closing\n");
+  sleep(60);
+#endif
+
  close(listensd);
  close(acceptsd);
 #endif
--- a/examples/nettest/nettest.h
+++ b/examples/nettest/nettest.h
@ -54,14 +54,34 @@

 #  define HTONS(a)       htons(a)
 #  define HTONL(a)       htonl(a)
+
+   /* Used printf for debug output */
+
 #  define message(...)   printf(__VA_ARGS__)
+
+   /* Have SO_LINGER */
+
+#  define NETTEST_HAVE_SOLINGER 1
+
 #else
+
+   /* Get errno using a pointer */
+
 #  define errno         *get_errno_ptr()
+
+   /* If debug is enabled, use the synchronous lib_lowprintf so that the
+    * program output does not get disassociated in the debug output.
+    */
+
 #  ifdef CONFIG_DEBUG
 #    define message(...) lib_lowprintf(__VA_ARGS__)
 #  else
 #    define message(...) printf(__VA_ARGS__)
 #  endif
+
+   /* At present, uIP does only abortive disconnects */
+
+#  undef NETTEST_HAVE_SOLINGER
 #endif

 #define PORTNO     5471
--- a/include/net/uip/uip-arch.h
+++ b/include/net/uip/uip-arch.h
@ -63,15 +63,25 @@
 * incoming data that should be processed, or because the periodic
 * timer has fired. These values are never used directly, but only in
 * the macrose defined in this file.
+ *
+ * UIP_DRV_RECEIVE - There is new incoming data from the driver in the d_buf
+ *                   field of the uip_driver_s structure.  The length of the
+ *                   new data is provided in the d_len field of the
+ *                   uip_driver_s structure.
+ * UIP_DRV_TIMER   - Called periodically from driver to service timeout-
+ *                   related activities to and to get timeout-related
+ *                   responses (e.g., reset)
+ * UIP_DRV_POLL    - Poll TCP for data to be transmitted
+ * UIP_DRV_UDPPOLL - Poll for UDP data to be transmitted.  This value is used
+ *                   internally by the uip_poll logic.
 */

-#define UIP_DATA          1 /* There is incoming data in the d_buf buffer. The
-                             * length of the data is stored in the field d_len. */
-#define UIP_TIMER         2 /* TCP periodic timer has fired */
-#define UIP_POLL_REQUEST  3 /* Poll TCP connection */
+#define UIP_DRV_RECEIVE   1
+#define UIP_DRV_TIMER     2
+#define UIP_DRV_POLL      3
 #ifdef CONFIG_NET_UDP
-# define UIP_UDP_POLL     4 /* Poll UDP connection */
-#endif  /* CONFIG_NET_UDP */
+# define UIP_DRV_UDPPOLL  4
+#endif

 /****************************************************************************
 * Public Types
@ -236,7 +246,7 @@ struct uip_driver_s
 *       }
 */

-#define uip_input(dev) uip_interrupt(dev,UIP_DATA)
+#define uip_input(dev) uip_interrupt(dev, UIP_DRV_RECEIVE)

 /* Polling of connections.
 *
@ -248,9 +258,9 @@ struct uip_driver_s
 * suplied function returns a non-zero value (which is would do only if
 * it cannot accept further write data).
 *
- * This function should be called periodically with event == UIP_TIMER for
- * periodic processing.  This function may also be called with UIP_POLL to
- * perform necessary periodic processing of TCP connections.
+ * This function should be called periodically with event == UIP_DRV_TIMER
+ * to perform TCP.  This function may also be called with UIP_DRV_POLL to
+ * obtain pending TX data.
 *
 * This function is called from the CAN device driver and may be called from
 * the timer interrupt/watchdog handle level.
@ -272,7 +282,7 @@ struct uip_driver_s
 *   }
 *
 *   ...
- *   uip_poll(dev, driver_callback, UIP_TIMER);
+ *   uip_poll(dev, driver_callback, UIP_DRV_TIMER);
 *
 * Note: If you are writing a uIP device driver that needs ARP (Address
 * Resolution Protocol), e.g., when running uIP over Ethernet, you will
@ -296,7 +306,7 @@ extern int uip_poll(struct uip_driver_s *dev, uip_poll_callback_t callback, int

 /* uip_poll helper functions */

-#define uip_periodic(dev,cb) uip_poll(dev,db,UIP_TIMER);
+#define uip_periodic(dev,cb) uip_poll(dev, db, UIP_DRV_TIMER);

 /* Architecure support
 *
--- a/net/send.c
+++ b/net/send.c
@ -128,7 +128,7 @@ static void send_interrupt(struct uip_driver_s *dev, void *private)

  else if (pstate->snd_state == STATE_DATA_SENT && uip_ack_event())
    {
-      /* Yes.. the data has been sent AND acknowledge */
+      /* Yes.. the data has been sent AND acknowledged */

      if (pstate->snd_buflen > uip_mss())
        {
--- a/net/uip/uip-poll.c
+++ b/net/uip/uip-poll.c
@ -95,9 +95,9 @@ static inline void uip_udppoll(struct uip_driver_s *dev, unsigned int conn)
 *   suplied function returns a non-zero value (which is would do only if
 *   it cannot accept further write data).
 *
- *   This function should be called periodically with event == UIP_TIMER for
- *   periodic processing.  This function may also be called with UIP_POLL to
- *   perform necessary periodic processing of TCP connections.
+ *   This function should be called periodically with event == UIP_DRV_TIMER
+ *   to perform period TCP processing.  This function may also be called
+ *   with UIP_DRV_POLL obtain queue TX data.
 *
 *   When the callback function is called, there may be an outbound packet
 *   waiting for service in the uIP packet buffer, and if so the d_len field
@ -144,7 +144,7 @@ int uip_poll(struct uip_driver_s *dev, uip_poll_callback_t callback, int event)
  while ((udp_conn = uip_nextudpconn(udp_conn)))
    {
      uip_udp_conn = udp_conn;
-      uip_interrupt(dev, UIP_UDP_POLL);
+      uip_interrupt(dev, UIP_DRV_UDPPOLL);
      if (callback(dev))
        {
          irqrestore(flags);
--- a/net/uip/uip.c
+++ b/net/uip/uip.c
@ -591,11 +591,11 @@ void uip_interrupt(struct uip_driver_s *dev, uint8 event)

  dev->d_snddata = dev->d_appdata = &dev->d_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN];

-  /* Check if we were invoked because of a poll request for a
-   * particular connection.
+  /* Check if we were invoked because of a TX poll request for a
+   * particular TCP connection.
   */

-  if (event == UIP_POLL_REQUEST)
+  if (event == UIP_DRV_POLL)
    {
      if ((uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_ESTABLISHED &&
           !uip_outstanding(uip_connr))
@ -609,7 +609,7 @@ void uip_interrupt(struct uip_driver_s *dev, uint8 event)

  /* Check if we were invoked because of the perodic timer firing. */

-  else if (event == UIP_TIMER)
+  else if (event == UIP_DRV_TIMER)
    {
 #if UIP_REASSEMBLY
      if (uip_reasstmr != 0)
@ -740,7 +740,7 @@ void uip_interrupt(struct uip_driver_s *dev, uint8 event)
    }

 #ifdef CONFIG_NET_UDP
-  else if (event == UIP_POLL)
+  else if (event == UIP_DRV_UDPPOLL)
    {
      if (uip_udp_conn->lport != 0)
        {
@ -937,7 +937,7 @@ void uip_interrupt(struct uip_driver_s *dev, uint8 event)

 #if UIP_PINGADDRCONF
 icmp_input:
-#endif /* UIP_PINGADDRCONF */
+#endif
  UIP_STAT(++uip_stat.icmp.recv);

  /* ICMP echo (i.e., ping) processing. This is simple, we only change
@ -1375,8 +1375,8 @@ tcp_send_syn:
  BUF->optdata[1] = TCP_OPT_MSS_LEN;
  BUF->optdata[2] = (UIP_TCP_MSS) / 256;
  BUF->optdata[3] = (UIP_TCP_MSS) & 255;
-  dev->d_len = UIP_IPTCPH_LEN + TCP_OPT_MSS_LEN;
-  BUF->tcpoffset = ((UIP_TCPH_LEN + TCP_OPT_MSS_LEN) / 4) << 4;
+  dev->d_len      = UIP_IPTCPH_LEN + TCP_OPT_MSS_LEN;
+  BUF->tcpoffset  = ((UIP_TCPH_LEN + TCP_OPT_MSS_LEN) / 4) << 4;
  goto tcp_send;

  /* This label will be jumped to if we found an active connection. */
@ -1426,9 +1426,9 @@ found:
    {
      if ((dev->d_len > 0 || ((BUF->flags & (TCP_SYN | TCP_FIN)) != 0)) &&
          (BUF->seqno[0] != uip_connr->rcv_nxt[0] ||
-          BUF->seqno[1] != uip_connr->rcv_nxt[1] ||
-          BUF->seqno[2] != uip_connr->rcv_nxt[2] ||
-          BUF->seqno[3] != uip_connr->rcv_nxt[3]))
+           BUF->seqno[1] != uip_connr->rcv_nxt[1] ||
+           BUF->seqno[2] != uip_connr->rcv_nxt[2] ||
+           BUF->seqno[3] != uip_connr->rcv_nxt[3]))
        {
          goto tcp_send_ack;
        }
@ -1959,7 +1959,9 @@ tcp_send_ack:
 tcp_send_nodata:

  dev->d_len = UIP_IPTCPH_LEN;
-  tcp_send_noopts:
+
+tcp_send_noopts:
+
  BUF->tcpoffset = (UIP_TCPH_LEN / 4) << 4;

 tcp_send: