DK-TM4C129X: The network monitor is no enabled by default in NSH configuration

TODO

@@ -15,7 +15,7 @@ nuttx/
   (8)  Kernel/Protected Builds
   (4)  C++ Support
   (6)  Binary loaders (binfmt/)
- (13)  Network (net/, drivers/net)
+ (14)  Network (net/, drivers/net)
   (4)  USB (drivers/usbdev, drivers/usbhost)
  (11)  Libraries (libc/, libm/)
  (11)  File system/Generic drivers (fs/, drivers/)
@@ -893,9 +893,10 @@ o Network (net/, drivers/net)
                the network stack.  The network stack supports either interrupt
                level processing or normal task level processing (depending on
                CONFIG_NET_NOINTS).  This is really a very bad use of CPU
-               resources;  All of the network stack processing should be more
+               resources;  All of the network stack processing should be
-               to a work queue (and, all use of CONFIG_NET_NOINTS=n should
+               modified to use a work queue (and, all use of CONFIG_NET_NOINTS=n
-               be eliminated).  This applies to almost all Ethernet drivers:
+               should be eliminated).  This applies to almost all Ethernet
+               drivers:
 
                ARCHITECTURE   CONFIG_NET_NOINTS
                C5471          NO
@@ -932,6 +933,16 @@ o Network (net/, drivers/net)
   Status:      Open
   Priority:    Low, unless your logic depends on that behavior.
 
+  Title:       NETWORK WON'T STAY DOWN
+  Description: If you enable the NSH network monitor (CONFIG_NSH_NETINIT_MONITOR)
+               then the NSH 'ifdown' command is broken.  Doing 'nsh> ifconfig eth0'
+               will, indeed, bring the network down.  However, the network monitor
+               notices the change in the link status and will bring the network
+               back up.  There needs to be some kind of interlock between
+               cmd_ifdown() and the network monitor thread to prevent this.
+  Status:      Open
+  Priority:    Low, this is just a nuisance in most cases.
+
 o USB (drivers/usbdev, drivers/usbhost)
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 

configs/dk-tm4c129x/README.txt

@@ -411,29 +411,7 @@ Networking Support
 
   Networking support via the can be added to NSH by selecting the following
   configuration options.
-==================================================
+
-file1: CONFIG_ARCH_HAVE_NET=y
-file1: CONFIG_ARP_SEND_DELAYMSEC=20
-file1: CONFIG_ARP_SEND_MAXTRIES=5
-file1: CONFIG_IOB_BUFSIZE=196
-file1: CONFIG_IOB_NBUFFERS=36
-file1: CONFIG_IOB_NCHAINS=8
-file1: CONFIG_IOB_THROTTLE=8
-file1: CONFIG_NSOCKET_DESCRIPTORS=8
-file1: CONFIG_SCHED_HPWORK=y
-file1: CONFIG_SCHED_HPWORKPERIOD=50000
-file1: CONFIG_SCHED_HPWORKPRIORITY=224
-file1: CONFIG_SCHED_HPWORKSTACKSIZE=2048
-file1: CONFIG_SCHED_WORKQUEUE=y
-file1: CONFIG_SIG_SIGWORK=17
-file1: =y
-file1:
-file1:
-file1:
-file1: =y
-file1: =y
-file1: CONFIG_WEBCLIENT_TIMEOUT=10
-==================================================
   Selecting the EMAC peripheral
   -----------------------------
 
@@ -573,20 +551,23 @@ f Application Configuration -> Network Utilities
     Builtin Apps:
     nsh>
 
-  NOTE:  If you enable this feature, you experience a delay on booting.
+  NOTE:  If you enable this networking as described above, you will
-  That is because the start-up logic waits for the network connection
+  experience a delay on booting NSH.  That is because the start-up logic
-  to be established before starting NuttX.  In a real application, you
+  waits for the network connection to be established before starting
-  would probably want to do the network bringup on a separate thread
+  NuttX.  In a real application, you would probably want to do the
-  so that access to the NSH prompt is not delayed.
+  network bringup on a separate thread so that access to the NSH prompt
+  is not delayed.
 
   This delay will be especially long if the board is not connected to
-  a network because additional time will be required to fail with timeout
+  a network.  On the order of minutes!  You will probably think that
-  errors.
+  NuttX has crashed!  And then, when it finally does come up after
+  numerous timeouts and retries, the network will not be available --
+  even if the network cable is plugged in later.
 
-  This delay will be especially long if the board is not connected to
+  The long delays can be eliminated by using a separate the network
-  a network.  On the order of a minute!  You will probably think that
+  initialization thread discussed below.  Recovering after the network
-  NuttX has crashed!  And then, when it finally does come up, the
+  becomes available requires the network monitor feature, also discussed
-  network will not be available.
+  below.
 
   Network Initialization Thread
   -----------------------------
@@ -606,8 +587,66 @@ f Application Configuration -> Network Utilities
       thread could poll periodically for network status, but does not).
 
   Both of these shortcomings could be eliminated by enabling the network
-  monitor.  See the SAMA5 configurations for a description of what it would
+  monitor:
-  take to incorporate the network monitor feature.
+
+  Network Monitor
+  ---------------
+  By default the network initialization thread will bring-up the network
+  then exit, freeing all of the resources that it required.  This is a
+  good behavior for systems with limited memory.
+
+  If the CONFIG_NSH_NETINIT_MONITOR option is selected, however, then the
+  network initialization thread will persist forever; it will monitor the
+  network status.  In the event that the network goes down (for example, if
+  a cable is removed), then the thread will monitor the link status and
+  attempt to bring the network back up.  In this case the resources
+  required for network initialization are never released.
+
+  Pre-requisites:
+
+    - CONFIG_NSH_NETINIT_THREAD as described above.
+
+    - CONFIG_TIVA_PHY_INTERRUPTS=y.  The TM4C129X EMAC block supports PHY
+      interrupts.  This is true whether the TM4C internal PHY is used or
+      if an external PHY is used.  If this option is selected, then support
+      for the PHY interrupt will be built in and the following additional
+      settings will be automatically selected:
+
+        CONFIG_NETDEV_PHY_IOCTL. Enable PHY IOCTL commands in the Ethernet
+        device driver. Special IOCTL commands must be provided by the Ethernet
+        driver to support certain PHY operations that will be needed for link
+        management. There operations are not complex and are implemented for
+        the Atmel SAMA5 family.
+
+        CONFIG_ARCH_PHY_INTERRUPT. This is not a user selectable option.
+        Rather, it is set when you select a board that supports PHY
+        interrupts.  In most architectures, the PHY interrupt is not
+        associated with the Ethernet driver at all; the Tiva architecture is
+        an exception. For most other architectures, the PHY interrupt is
+        provided via some board-specific GPIO.  In any event, the board-
+        specific logic must provide support for the PHY interrupt. To do
+        this, the board logic must do two things: (1) It must provide the
+        function arch_phy_irq() as described and prototyped in the
+        nuttx/include/nuttx/arch.h, and (2) it must select
+        CONFIG_ARCH_PHY_INTERRUPT in the board configuration file to
+        advertise that it supports arch_phy_irq().
+
+        And a few other things: UDP support is required (CONFIG_NET_UDP) and
+        signals must not be disabled (CONFIG_DISABLE_SIGNALS).
+
+  Given those prerequisites, the network monitor can be selected with these
+  additional settings.
+
+    System Type -> Tiva Ethernet Configuration
+      CONFIG_TIVA_PHY_INTERRUPTS=y          : Enable PHY interrupt support
+      CONFIG_ARCH_PHY_INTERRUPT=y           : (auto-selected)
+      CONFIG_NETDEV_PHY_IOCTL=y             : (auto-selected)
+
+    Application Configuration -> NSH Library -> Networking Configuration
+      CONFIG_NSH_NETINIT_THREAD             : Enable the network initialization thread
+      CONFIG_NSH_NETINIT_MONITOR=y          : Enable the network monitor
+      CONFIG_NSH_NETINIT_RETRYMSEC=2000     : Configure the network monitor as you like
+      CONFIG_NSH_NETINIT_SIGNO=18
 
 DK-TM4129X Configuration Options
 ================================
@@ -776,16 +815,24 @@ Where <subdir> is one of the following:
        easily disabled or reconfigured (See see the network related
        configuration settings above in the section entitled "Networking").
 
-       NOTE: In boot-up sequence is very simple in this example; all
+       By default, this configuration assumes a 10.0.0.xx network.  It
-       initialization is done sequentially (vs. in parallel) and so you will
+       uses a fixed IP address of 10.0.0.2 and assumes that the host is
-       not see the NSH prompt until all initialization is complete.  The
+       at 10.0.0.1 and that the host provides the default router.  The
-       network bring-up in particular will add some delay before the NSH
+       network mask is 255.255.255.0.  These address can be changed by
-       prompt appears.  In a real application, you would probably want to
+       modifying the settings in the configuration.  DHCPC can be enabled
-       do the network bringup on a separate thread so that access to the
+       be modifying this default configuration (See the "Networking"
-       NSH prompt is not delayed.
+       section above).
 
-       This delay will be especially long if the board is not connected to
+       The network initialization thread is enabled in this example.  NSH
-       a network because additional time will be required to fail with
+       will create a separate thread when it starts to initialize the
-       timeout errors.  This delay can be eliminated, however, if you enable
+       network.  This eliminates start-up delays to bring the network.  This
-       an NSH initialization option as described above in a paragraph
+       feature may be disabled by reverting the configuration described above
-       entitled, "Network Initialization Thread."
+       under "Network Initialization Thread"
+
+       The persistent network monitor thread is also available in this
+       configuration.  The network monitor will monitor changes in the
+       link status and gracefully take the network down when the link is
+       lost (for example, if the cable is disconnected) and bring the
+       network back up when the link becomes available again (for example,
+       if the cable is reconnected.  The paragraph "Network Monitor" above
+       for additional information.

configs/dk-tm4c129x/nsh/defconfig

@@ -214,7 +214,7 @@ CONFIG_TIVA_GPIOP_IRQS=y
 #
 CONFIG_TIVA_PHY_INTERNAL=y
 CONFIG_TIVA_AUTONEG=y
-# CONFIG_TIVA_PHY_INTERRUPTS is not set
+CONFIG_TIVA_PHY_INTERRUPTS=y
 CONFIG_TIVA_EMAC_NRXDESC=8
 CONFIG_TIVA_EMAC_NTXDESC=4
 # CONFIG_TIVA_EMAC_ENHANCEDDESC is not set
@@ -451,6 +451,7 @@ CONFIG_NETDEVICES=y
 # CONFIG_NET_E1000 is not set
 # CONFIG_NET_SLIP is not set
 # CONFIG_NET_VNET is not set
+CONFIG_ARCH_PHY_INTERRUPT=y
 # CONFIG_PIPES is not set
 # CONFIG_PM is not set
 # CONFIG_POWER is not set
@@ -552,7 +553,7 @@ CONFIG_NET_SOLINGER=y
 #
 # Network Device Operations
 #
-# CONFIG_NETDEV_PHY_IOCTL is not set
+CONFIG_NETDEV_PHY_IOCTL=y
 
 #
 # Raw Socket Support
@@ -928,7 +929,12 @@ CONFIG_NSH_CONSOLE=y
 #
 # Networking Configuration
 #
-# CONFIG_NSH_NETINIT_THREAD is not set
+CONFIG_NSH_NETINIT_THREAD=y
+CONFIG_NSH_NETINIT_MONITOR=y
+CONFIG_NSH_NETINIT_SIGNO=18
+CONFIG_NSH_NETINIT_RETRYMSEC=2000
+CONFIG_NSH_NETINIT_THREAD_STACKSIZE=1568
+CONFIG_NSH_NETINIT_THREAD_PRIORITY=100
 CONFIG_NSH_IPADDR=0x0a000002
 CONFIG_NSH_DRIPADDR=0x0a000001
 CONFIG_NSH_NETMASK=0xffffff00
@@ -1021,6 +1027,7 @@ CONFIG_READLINE_ECHO=y
 #
 # PHY Tool
 #
+# CONFIG_SYSTEM_MDIO is not set
 
 #
 # Power Off

configs/sama5d4-ek/README.txt

@@ -1509,7 +1509,7 @@ Networking
     - And a few other things: UDP support is required (CONFIG_NET_UDP) and
       signals must not be disabled (CONFIG_DISABLE_SIGNALS).
 
-  Given those prerequisites, the newtork monitor can be selected with these additional settings.
+  Given those prerequisites, the network monitor can be selected with these additional settings.
 
     Networking Support -> Networking Device Support
       CONFIG_NETDEV_PHY_IOCTL=y             : Enable PHY ioctl support