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annotate packages/redboot/current/src/net/pktbuf.c @ 3292:7f8e529b4d82 default tip

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Fix FREESCALE_EDMA_NBYTES_MLOFFYES_MLOFF() so it works with negative offsets.
author vae
date Wed, 29 Apr 2015 23:31:48 +0000
parents 74dbf4c3f2e1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //==========================================================================
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2 //
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3 // net/pktbuf.c
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4 //
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5 // Stand-alone network packet support for RedBoot
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6 //
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7 //==========================================================================
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8 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): gthomas
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43 // Contributors: gthomas
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44 // Date: 2000-07-14
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45 // Purpose:
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46 // Description:
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47 //
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48 // This code is part of RedBoot (tm).
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //==========================================================================
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53
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54 #include <redboot.h>
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55 #include <net/net.h>
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56
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57 #define MAX_PKTBUF CYGNUM_REDBOOT_NETWORKING_MAX_PKTBUF
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58
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59 #define BUFF_STATS 1
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60
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61 #if BUFF_STATS
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62 int max_alloc = 0;
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63 int num_alloc = 0;
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64 int num_free = 0;
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65 #endif
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66
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67 static pktbuf_t pktbuf_list[MAX_PKTBUF];
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68 static word bufdata[MAX_PKTBUF][ETH_MAX_PKTLEN/2 + 1];
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69 static pktbuf_t *free_list;
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70
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71
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72 /*
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73 * Initialize the free list.
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74 */
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75 void
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76 __pktbuf_init(void)
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77 {
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78 int i;
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79 word *p;
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80 static int init = 0;
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81
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82 if (init) return;
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83 init = 1;
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84
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85 for (i = 0; i < MAX_PKTBUF; i++) {
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86 p = bufdata[i];
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87 if ((((unsigned long)p) & 2) != 0)
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88 ++p;
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89 pktbuf_list[i].buf = p;
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90 pktbuf_list[i].bufsize = ETH_MAX_PKTLEN;
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91 pktbuf_list[i].next = free_list;
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92 free_list = &pktbuf_list[i];
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93 }
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94 }
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95
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96 void
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97 __pktbuf_dump(void)
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98 {
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99 int i;
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100 for (i = 0; i < MAX_PKTBUF; i++) {
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101 diag_printf("Buf[%d]/%p: buf: %p, len: %d/%d, next: %p\n",
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102 i,
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103 (void*)&pktbuf_list[i],
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104 (void*)pktbuf_list[i].buf,
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105 pktbuf_list[i].bufsize,
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106 pktbuf_list[i].pkt_bytes,
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107 (void*)pktbuf_list[i].next);
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108 }
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109 diag_printf("Free list = %p\n", (void*)free_list);
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110 }
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111
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112 /*
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113 * simple pktbuf allocation
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114 */
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115 pktbuf_t *
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116 __pktbuf_alloc(int nbytes)
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117 {
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118 pktbuf_t *p = free_list;
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119
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120 if (p) {
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121 free_list = p->next;
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122 p->ip_hdr = (ip_header_t *)p->buf;
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123 p->tcp_hdr = (tcp_header_t *)(p->ip_hdr + 1);
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124 p->pkt_bytes = 0;
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125 #if BUFF_STATS
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126 ++num_alloc;
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127 if ((num_alloc - num_free) > max_alloc)
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128 max_alloc = num_alloc - num_free;
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129 #endif
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130 }
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131 return p;
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132 }
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133
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134
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135 /*
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136 * free a pktbuf.
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137 */
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138 void
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139 __pktbuf_free(pktbuf_t *pkt)
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140 {
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141 #if BUFF_STATS
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142 --num_alloc;
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143 #endif
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144 #ifdef BSP_LOG
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145 {
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146 int i;
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147 word *p;
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148
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149 for (i = 0; i < MAX_PKTBUF; i++) {
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150 p = bufdata[i];
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151 if ((((unsigned long)p) & 2) == 0)
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152 ++p;
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153 if (p == (word *)pkt)
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154 break;
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155 }
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156 if (i < MAX_PKTBUF) {
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157 BSPLOG(bsp_log("__pktbuf_free: bad pkt[%x].\n", pkt));
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158 BSPLOG(while(1));
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159 }
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160 }
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161 #endif
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162 pkt->next = free_list;
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163 free_list = pkt;
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164 }
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165
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166