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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [ethernet/] [uIP/] [uip-1.0/] [uip/] [uip-split.h] - Blame information for rev 606

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1 606 jeremybenn
/*
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 * Copyright (c) 2004, Swedish Institute of Computer Science.
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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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 * 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. Neither the name of the Institute nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 *
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 * This file is part of the uIP TCP/IP stack
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 *
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 * Author: Adam Dunkels <adam@sics.se>
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 *
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 * $Id: uip-split.h 2 2011-07-17 20:13:17Z filepang@gmail.com $
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 */
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/**
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 * \addtogroup uip
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 * @{
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 */
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/**
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 * \defgroup uipsplit uIP TCP throughput booster hack
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 * @{
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 *
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 * The basic uIP TCP implementation only allows each TCP connection to
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 * have a single TCP segment in flight at any given time. Because of
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 * the delayed ACK algorithm employed by most TCP receivers, uIP's
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 * limit on the amount of in-flight TCP segments seriously reduces the
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 * maximum achievable throughput for sending data from uIP.
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 *
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 * The uip-split module is a hack which tries to remedy this
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 * situation. By splitting maximum sized outgoing TCP segments into
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 * two, the delayed ACK algorithm is not invoked at TCP
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 * receivers. This improves the throughput when sending data from uIP
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 * by orders of magnitude.
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 *
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 * The uip-split module uses the uip-fw module (uIP IP packet
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 * forwarding) for sending packets. Therefore, the uip-fw module must
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 * be set up with the appropriate network interfaces for this module
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 * to work.
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 */
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/**
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 * \file
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 * Module for splitting outbound TCP segments in two to avoid the
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 * delayed ACK throughput degradation.
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 * \author
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 * Adam Dunkels <adam@sics.se>
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 *
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 */
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#ifndef __UIP_SPLIT_H__
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#define __UIP_SPLIT_H__
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/**
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 * Handle outgoing packets.
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 *
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 * This function inspects an outgoing packet in the uip_buf buffer and
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 * sends it out using the uip_fw_output() function. If the packet is a
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 * full-sized TCP segment it will be split into two segments and
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 * transmitted separately. This function should be called instead of
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 * the actual device driver output function, or the uip_fw_output()
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 * function.
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 *
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 * The headers of the outgoing packet is assumed to be in the uip_buf
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 * buffer and the payload is assumed to be wherever uip_appdata
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 * points. The length of the outgoing packet is assumed to be in the
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 * uip_len variable.
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 *
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 */
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void uip_split_output(void);
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#endif /* __UIP_SPLIT_H__ */
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/** @} */
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/** @} */

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