1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/****************************************************************************
* net/uip/uip_tcpreadahead.c
*
* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/net/uip/uipopt.h>
#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP) && (CONFIG_NET_NTCP_READAHEAD_BUFFERS > 0)
#include <queue.h>
#include <debug.h>
#include <nuttx/net/uip/uip.h>
#include "uip_internal.h"
/****************************************************************************
* Private Data
****************************************************************************/
/* These are the pre-allocated read-ahead buffers */
static struct uip_readahead_s g_buffers[CONFIG_NET_NTCP_READAHEAD_BUFFERS];
/* This is the list of available read-ahead buffers */
static sq_queue_t g_freebuffers;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: uip_tcpreadaheadinit
*
* Description:
* Initialize the list of free read-ahead buffers
*
* Assumptions:
* Called once early initialization.
*
****************************************************************************/
void uip_tcpreadaheadinit(void)
{
int i;
sq_init(&g_freebuffers);
for (i = 0; i < CONFIG_NET_NTCP_READAHEAD_BUFFERS; i++)
{
sq_addfirst(&g_buffers[i].rh_node, &g_freebuffers);
}
}
/****************************************************************************
* Function: uip_tcpreadaheadalloc
*
* Description:
* Allocate a TCP read-ahead buffer by taking a pre-allocated buffer from
* the free list. This function is called from TCP logic when new,
* incoming TCP data is received but there is no user logic recving the
* the data. Note: malloc() cannot be used because this function is
* called from interrupt level.
*
* Assumptions:
* Called from interrupt level with interrupts disabled.
*
****************************************************************************/
struct uip_readahead_s *uip_tcpreadaheadalloc(void)
{
return (struct uip_readahead_s*)sq_remfirst(&g_freebuffers);
}
/****************************************************************************
* Function: uip_tcpreadaheadrelease
*
* Description:
* Release a TCP read-ahead buffer by returning the buffer to the free list.
* This function is called from user logic after it is consumed the buffered
* data.
*
* Assumptions:
* Called from user logic BUT with interrupts disabled.
*
****************************************************************************/
void uip_tcpreadaheadrelease(struct uip_readahead_s *buf)
{
sq_addfirst(&buf->rh_node, &g_freebuffers);
}
#endif /* CONFIG_NET && CONFIG_NET_TCP && CONFIG_NET_NTCP_READAHEAD_BUFFERS*/
|