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libbsd.txt: Move network interface driver hints

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Sebastian Huber
2022-05-23 11:25:08 +02:00
parent b375969a2f
commit 0283481dab
1 changed files with 14 additions and 0 deletions
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CONTRIBUTING.rst
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@@ -493,3 +493,17 @@ within interrupt context is not allowed, so the Board Support Package (BSP)
should support the should support the
`Interrupt Manager <https://docs.rtems.org/branches/master/c-user/interrupt/directives.html#rtems-interrupt-server-handler-install>`_ `Interrupt Manager <https://docs.rtems.org/branches/master/c-user/interrupt/directives.html#rtems-interrupt-server-handler-install>`_
in general. in general.
Network Interface Drivers Hints
===============================
Link Up/Down Events
-------------------
You can notifiy the application space of link up/down events in your network
interface driver via the
``if_link_state_change(LINK_STATE_UP/LINK_STATE_DOWN)`` function. The
DHCPCD(8) client is a consumer of these events for example. Make sure that the
interface flag ``IFF_UP`` and the interface driver flag ``IFF_DRV_RUNNING`` is
set in case the link is up, otherwise ``ether_output()`` will return the error
status ``ENETDOWN``.