131 lines
4.1 KiB
C
131 lines
4.1 KiB
C
/****************************************************************************
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* net/tcp/tcp_devpoll.c
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* Driver poll for the availability of TCP TX data
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*
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* Copyright (C) 2007-2009, 2016-2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Adapted for NuttX from logic in uIP which also has a BSD-like license:
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*
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* Original author Adam Dunkels <adam@dunkels.com>
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* Copyright () 2001-2003, Adam Dunkels.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP)
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#include <stdint.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/tcp.h>
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#include "devif/devif.h"
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#include "tcp/tcp.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tcp_poll
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*
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* Description:
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* Poll a TCP connection structure for availability of TX data
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*
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* Input Parameters:
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* dev - The device driver structure to use in the send operation
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* conn - The TCP "connection" to poll for TX data
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* It is called with the network locked.
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* dev is not NULL.
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* conn is not NULL.
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* The connection (conn) is bound to the polling device (dev).
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*
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****************************************************************************/
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void tcp_poll(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn)
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{
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uint16_t result;
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DEBUGASSERT(dev != NULL && conn != NULL && dev == conn->dev);
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/* Prepare device buffer */
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if (netdev_iob_prepare(dev, false, 0) != OK)
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{
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return;
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}
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/* Discard any currently buffered data */
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if (conn->timeout)
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{
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conn->timeout = false;
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tcp_timer(dev, conn);
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return;
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}
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dev->d_len = 0;
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dev->d_sndlen = 0;
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/* Verify that the connection is established. */
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if ((conn->tcpstateflags & TCP_STATE_MASK) == TCP_ESTABLISHED)
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{
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/* Set up for the callback. We can't know in advance if the
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* application is going to send a IPv4 or an IPv6 packet, so this
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* setup may not actually be used.
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*/
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tcp_ip_select(conn);
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/* Perform the callback */
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result = tcp_callback(dev, conn, TCP_POLL);
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/* Handle the callback response */
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tcp_appsend(dev, conn, result);
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}
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}
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#endif /* CONFIG_NET && CONFIG_NET_TCP */
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