forked from Archive/PX4-Autopilot
131 lines
4.8 KiB
C
131 lines
4.8 KiB
C
/****************************************************************************
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* net/uip/uip_tcpreadahead.c
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*
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* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* 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/net/uip/uipopt.h>
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#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP) && (CONFIG_NET_NTCP_READAHEAD_BUFFERS > 0)
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#include <queue.h>
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#include <debug.h>
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#include <nuttx/net/uip/uip.h>
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#include "uip_internal.h"
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* These are the pre-allocated read-ahead buffers */
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static struct uip_readahead_s g_buffers[CONFIG_NET_NTCP_READAHEAD_BUFFERS];
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/* This is the list of available read-ahead buffers */
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static sq_queue_t g_freebuffers;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: uip_tcpreadaheadinit
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*
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* Description:
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* Initialize the list of free read-ahead buffers
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*
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* Assumptions:
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* Called once early initialization.
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*
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****************************************************************************/
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void uip_tcpreadaheadinit(void)
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{
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int i;
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sq_init(&g_freebuffers);
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for (i = 0; i < CONFIG_NET_NTCP_READAHEAD_BUFFERS; i++)
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{
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sq_addfirst(&g_buffers[i].rh_node, &g_freebuffers);
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}
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}
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/****************************************************************************
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* Function: uip_tcpreadaheadalloc
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*
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* Description:
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* Allocate a TCP read-ahead buffer by taking a pre-allocated buffer from
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* the free list. This function is called from TCP logic when new,
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* incoming TCP data is received but there is no user logic recving the
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* the data. Note: malloc() cannot be used because this function is
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* called from interrupt level.
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*
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* Assumptions:
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* Called from interrupt level with interrupts disabled.
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*
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****************************************************************************/
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struct uip_readahead_s *uip_tcpreadaheadalloc(void)
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{
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return (struct uip_readahead_s*)sq_remfirst(&g_freebuffers);
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}
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/****************************************************************************
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* Function: uip_tcpreadaheadrelease
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*
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* Description:
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* Release a TCP read-ahead buffer by returning the buffer to the free list.
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* This function is called from user logic after it is consumed the buffered
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* data.
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*
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* Assumptions:
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* Called from user logic BUT with interrupts disabled.
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*
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****************************************************************************/
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void uip_tcpreadaheadrelease(struct uip_readahead_s *buf)
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{
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sq_addfirst(&buf->rh_node, &g_freebuffers);
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}
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#endif /* CONFIG_NET && CONFIG_NET_TCP && CONFIG_NET_NTCP_READAHEAD_BUFFERS*/
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