8a63d29c6e
Allocate the device buffer only if the protocol really need to send data. not all protocols require the driver to prepare additional iob before sending, especially UDP, each iob reserves l2/l3 header in advance after prepare write buffer, net device could reuse this entry to send directly Signed-off-by: chao an <anchao@xiaomi.com>
145 lines
4.4 KiB
C
145 lines
4.4 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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#if defined(CONFIG_NET_IPv6) && defined(CONFIG_NET_IPv4)
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if (conn->domain == PF_INET)
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{
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tcp_ipv4_select(dev);
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}
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else
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{
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tcp_ipv6_select(dev);
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}
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#elif defined(CONFIG_NET_IPv4)
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tcp_ipv4_select(dev);
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#else /* if defined(CONFIG_NET_IPv6) */
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tcp_ipv6_select(dev);
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#endif
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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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