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authorVijay Kumar Banerjee <vijay@rtems.org>2021-03-01 09:44:55 -0700
committerVijay Kumar Banerjee <vijay@rtems.org>2021-03-30 09:28:59 -0600
commit22d213c4846d2d783a8e84cc0b8e067dfe9b1a1e (patch)
tree71182c7caec4fe9b86cba4f8e4b1a7ec64533d64 /networking/network_task_structure.rst
parentUser/BSPs/Beagle: Add JTAG debugger section (diff)
downloadrtems-docs-22d213c4846d2d783a8e84cc0b8e067dfe9b1a1e.tar.bz2
networking: Rename to legacy networking
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-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-.. COMMENT: Written by Eric Norum
-.. Copyright (C) 1988, 2002 On-Line Applications Research Corporation (OAR)
-
-Network Task Structure and Data Flow
-####################################
-
-A schematic diagram of the tasks and message *mbuf* queues in a simple RTEMS
-networking application is shown in the following figure:
-
-.. figure:: ../images/networking/networkflow.png
- :align: center
- :alt: Network Flow
-
-The transmit task for each network interface is normally blocked waiting for a
-packet to arrive in the transmit queue. Once a packet arrives, the transmit
-task may block waiting for an event from the transmit interrupt handler. The
-transmit interrupt handler sends an RTEMS event to the transmit task to
-indicate that transmit hardware resources have become available.
-
-The receive task for each network interface is normally blocked waiting for an
-event from the receive interrupt handler. When this event is received the
-receive task reads the packet and forwards it to the network stack for
-subsequent processing by the network task.
-
-The network task processes incoming packets and takes care of timed operations
-such as handling TCP timeouts and aging and removing routing table entries.
-
-The 'Network code' contains routines which may run in the context of the user
-application tasks, the interface receive task or the network task. A network
-semaphore ensures that the data structures manipulated by the network code
-remain consistent.