Projects/Webserver/Lib/uip/uip-split.h

   1 /*
   2  * Copyright (c) 2004, Swedish Institute of Computer Science.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the Institute nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * This file is part of the Contiki operating system.
  30  *
  31  * Author: Adam Dunkels <adam@sics.se>
  32  *
  33  * $Id: uip-split.h,v 1.1 2006/06/17 22:41:19 adamdunkels Exp $
  34  */
  35 /**
  36  * \addtogroup uip
  37  * @{
  38  */
  39
  40 /**
  41  * \defgroup uipsplit uIP TCP throughput booster hack
  42  * @{
  43  *
  44  * The basic uIP TCP implementation only allows each TCP connection to
  45  * have a single TCP segment in flight at any given time. Because of
  46  * the delayed ACK algorithm employed by most TCP receivers, uIP's
  47  * limit on the amount of in-flight TCP segments seriously reduces the
  48  * maximum achievable throughput for sending data from uIP.
  49  *
  50  * The uip-split module is a hack which tries to remedy this
  51  * situation. By splitting maximum sized outgoing TCP segments into
  52  * two, the delayed ACK algorithm is not invoked at TCP
  53  * receivers. This improves the throughput when sending data from uIP
  54  * by orders of magnitude.
  55  *
  56  * The uip-split module uses the uip-fw module (uIP IP packet
  57  * forwarding) for sending packets. Therefore, the uip-fw module must
  58  * be set up with the appropriate network interfaces for this module
  59  * to work.
  60  */
  61
  62
  63 /**
  64  * \file
  65  * Module for splitting outbound TCP segments in two to avoid the
  66  * delayed ACK throughput degradation.
  67  * \author
  68  * Adam Dunkels <adam@sics.se>
  69  *
  70  */
  71
  72 #ifndef __UIP_SPLIT_H__
  73 #define __UIP_SPLIT_H__
  74
  75 #include <string.h>
  76 #include <uip.h>
  77
  78 #include "../../USBHostMode.h"
  79
  80 #include <LUFA/Drivers/USB/Class/RNDIS.h>
  81
  82 /**
  83  * Handle outgoing packets.
  84  *
  85  * This function inspects an outgoing packet in the uip_buf buffer and
  86  * sends it out using the uip_fw_output() function. If the packet is a
  87  * full-sized TCP segment it will be split into two segments and
  88  * transmitted separately. This function should be called instead of
  89  * the actual device driver output function, or the uip_fw_output()
  90  * function.
  91  *
  92  * The headers of the outgoing packet is assumed to be in the uip_buf
  93  * buffer and the payload is assumed to be wherever uip_appdata
  94  * points. The length of the outgoing packet is assumed to be in the
  95  * uip_len variable.
  96  *
  97  */
  98 void uip_split_output(void);
  99 void uip_add32(u8_t *op32, u16_t op16);
 100 #endif /* __UIP_SPLIT_H__ */
 101
 102 /** @} */
 103 /** @} */
 104