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130 lines
4.8 KiB
130 lines
4.8 KiB
/**************************************************************************** |
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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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