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annotate packages/redboot/current/src/net/enet.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/enet.c
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4 //
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5 // Stand-alone ethernet [link-layer] 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 ENET_STATS 1
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49
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50 #ifdef ENET_STATS
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51 static int num_ip = 0;
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52 static int num_arp = 0;
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53 #ifdef NET_SUPPORT_RARP
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54 static int num_rarp = 0;
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55 #endif
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56 static int num_received = 0;
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57 static int num_transmitted = 0;
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58 #endif
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59
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60 /*
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61 * Non-blocking poll of ethernet link. Process packets until no more
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62 * are available.
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63 */
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64 void
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65 __enet_poll(void)
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66 {
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67 pktbuf_t *pkt;
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68 eth_header_t eth_hdr;
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69
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70 while (true) {
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71 /*
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72 * Try to get a free pktbuf and return if none
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73 * are available.
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74 */
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75 if ((pkt = __pktbuf_alloc(ETH_MAX_PKTLEN)) == NULL) {
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76 printf("__enet_poll: no more buffers\n");
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77 while (1) ;
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78 return;
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79 }
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80
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81 if ((pkt->pkt_bytes = eth_drv_read(&eth_hdr, (char *)pkt->buf,
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82 ETH_MAX_PKTLEN)) > 0) {
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83 #if ENET_STATS
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84 ++num_received;
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85 #endif
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86 switch (ntohs(eth_hdr.type)) {
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87
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88 case ETH_TYPE_IP:
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89 #if ENET_STATS
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90 ++num_ip;
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91 #endif
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92 pkt->ip_hdr = (ip_header_t *)pkt->buf;
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93 __ip_handler(pkt, &eth_hdr.source);
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94 break;
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95
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96 case ETH_TYPE_ARP:
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97 #if ENET_STATS
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98 ++num_arp;
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99 #endif
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100 pkt->arp_hdr = (arp_header_t *)pkt->buf;
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101 __arp_handler(pkt);
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102 break;
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103
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104 #ifdef NET_SUPPORT_RARP
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105 case ETH_TYPE_RARP:
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106 #if ENET_STATS
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107 ++num_rarp;
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108 #endif
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109 pkt->arp_hdr = (arp_header_t *)pkt->buf;
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110 __rarp_handler(pkt);
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111 break;
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112 #endif
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113
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114 default:
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115 __pktbuf_free(pkt);
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116 break;
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117 }
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118 } else {
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119 __pktbuf_free(pkt);
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120 break;
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121 }
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122 }
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123 }
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124
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125
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126
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127 /*
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128 * Send an ethernet packet.
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129 */
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130 void
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131 __enet_send(pktbuf_t *pkt, enet_addr_t *dest, int eth_type)
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132 {
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133 eth_header_t eth_hdr;
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134
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135 // Set up ethernet header
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136 memcpy(&eth_hdr.destination, dest, sizeof(enet_addr_t));
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137 memcpy(&eth_hdr.source, __local_enet_addr, sizeof(enet_addr_t));
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138 eth_hdr.type = htons(eth_type);
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139
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140 eth_drv_write(&eth_hdr, (const char *)pkt->buf, pkt->pkt_bytes);
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141 #if ENET_STATS
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142 ++num_transmitted;
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143 #endif
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144 }
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145
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146
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147 #ifdef __LITTLE_ENDIAN__
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148
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149 unsigned long
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150 ntohl(unsigned long x)
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151 {
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152 return (((x & 0x000000FF) << 24) |
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153 ((x & 0x0000FF00) << 8) |
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154 ((x & 0x00FF0000) >> 8) |
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155 ((x & 0xFF000000) >> 24));
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156 }
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157
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158 unsigned long
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159 ntohs(unsigned short x)
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160 {
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161 return (((x & 0x00FF) << 8) |
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162 ((x & 0xFF00) >> 8));
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163 }
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164
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165 #endif