Mercurial > flash_v2

annotate packages/redboot/current/src/net/pktbuf.c @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
parents
children eb9fd8c04db3
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115
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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 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): gthomas
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35 // Contributors: gthomas
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36 // Date: 2000-07-14
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37 // Purpose:
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38 // Description:
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39 //
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40 // This code is part of RedBoot (tm).
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41 //
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42 //####DESCRIPTIONEND####
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43 //
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44 //==========================================================================
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45
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46 #include <net/net.h>
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47
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48 #define MAX_PKTBUF CYGNUM_REDBOOT_NETWORKING_MAX_PKTBUF
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49
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50 #define BUFF_STATS 1
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51
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52 #if BUFF_STATS
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53 int max_alloc = 0;
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54 int num_alloc = 0;
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55 int num_free = 0;
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56 #endif
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57
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58 static pktbuf_t pktbuf_list[MAX_PKTBUF];
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59 static word bufdata[MAX_PKTBUF][ETH_MAX_PKTLEN/2 + 1];
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60 static pktbuf_t *free_list;
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61
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62
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63 /*
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64 * Initialize the free list.
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65 */
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66 void
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67 __pktbuf_init(void)
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68 {
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69 int i;
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70 word *p;
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71 static int init = 0;
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72
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73 if (init) return;
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74 init = 1;
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75
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76 for (i = 0; i < MAX_PKTBUF; i++) {
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77 p = bufdata[i];
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78 if ((((unsigned long)p) & 2) != 0)
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79 ++p;
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80 pktbuf_list[i].buf = p;
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81 pktbuf_list[i].bufsize = ETH_MAX_PKTLEN;
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82 pktbuf_list[i].next = free_list;
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83 free_list = &pktbuf_list[i];
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84 }
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85 }
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86
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87
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88 /*
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89 * simple pktbuf allocation
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90 */
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91 pktbuf_t *
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92 __pktbuf_alloc(int nbytes)
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93 {
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94 pktbuf_t *p = free_list;
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95
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96 if (p) {
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97 free_list = p->next;
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98 #if 0
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99 p->eth_hdr = (eth_header_t *)p->buf;
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100 p->ip_hdr = (ip_header_t *)(p->eth_hdr + 1);
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101 #else
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102 p->ip_hdr = (ip_header_t *)p->buf;
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103 #endif
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104 p->tcp_hdr = (tcp_header_t *)(p->ip_hdr + 1);
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105 p->pkt_bytes = 0;
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106 #if BUFF_STATS
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107 ++num_alloc;
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108 if ((num_alloc - num_free) > max_alloc)
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109 max_alloc = num_alloc - num_free;
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110 #endif
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111 }
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112 return p;
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113 }
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114
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115
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116 /*
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117 * free a pktbuf.
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118 */
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119 void
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120 __pktbuf_free(pktbuf_t *pkt)
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121 {
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122 #if BUFF_STATS
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123 --num_alloc;
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124 #endif
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125 #ifdef BSP_LOG
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126 {
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127 int i;
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128 word *p;
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129
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130 for (i = 0; i < MAX_PKTBUF; i++) {
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131 p = bufdata[i];
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132 if ((((unsigned long)p) & 2) == 0)
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133 ++p;
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134 if (p == (word *)pkt)
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135 break;
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136 }
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137 if (i < MAX_PKTBUF) {
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138 BSPLOG(bsp_log("__pktbuf_free: bad pkt[%x].\n", pkt));
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139 BSPLOG(while(1));
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140 }
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141 }
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142 #endif
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143 pkt->next = free_list;
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144 free_list = pkt;
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145 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
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6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
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147