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annotate packages/redboot/current/src/net/enet.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents 678094f34118
children d2c90368aeef
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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 //####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 Red Hat, 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 version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): gthomas
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44 // Contributors: gthomas
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45 // Date: 2000-07-14
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46 // Purpose:
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47 // Description:
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48 //
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49 // This code is part of RedBoot (tm).
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50 //
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51 //####DESCRIPTIONEND####
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52 //
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53 //==========================================================================
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54
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55 #include <redboot.h>
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56 #include <net/net.h>
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57 #include <cyg/io/eth/eth_drv.h> // Logical driver interfaces
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58
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59 //#define ENET_STATS 1
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60
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61 #ifdef ENET_STATS
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62 static int num_ip = 0;
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63 static int num_arp = 0;
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64 #ifdef NET_SUPPORT_RARP
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65 static int num_rarp = 0;
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66 #endif
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67 static int num_received = 0;
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68 static int num_transmitted = 0;
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69 #endif
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70
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71 //
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72 // Support for user handlers of additional ethernet packets (nonIP)
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73 //
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74
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75 #define NUM_EXTRA_HANDLERS 4
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76 static struct {
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77 int type;
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78 pkt_handler_t handler;
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79 } eth_handlers[NUM_EXTRA_HANDLERS];
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80
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81 pkt_handler_t
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82 __eth_install_listener(int eth_type, pkt_handler_t handler)
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83 {
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84 int i, empty;
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85 pkt_handler_t old;
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86
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87 if (eth_type > 0x800 || handler != (pkt_handler_t)0) {
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88 empty = -1;
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89 for (i = 0; i < NUM_EXTRA_HANDLERS; i++) {
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90 if (eth_handlers[i].type == eth_type) {
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91 // Replace existing handler
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92 old = eth_handlers[i].handler;
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93 eth_handlers[i].handler = handler;
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94 return old;
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95 }
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96 if (eth_handlers[i].type == 0) {
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97 empty = i;
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98 }
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99 }
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100 if (empty >= 0) {
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101 // Found a free slot
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102 eth_handlers[empty].type = eth_type;
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103 eth_handlers[empty].handler = handler;
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104 return (pkt_handler_t)0;
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105 }
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106 }
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107 diag_printf("** Warning: can't install listener for ethernet type 0x%02x\n", eth_type);
151
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108 return (pkt_handler_t)0;
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109 }
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110
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111 void
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112 __eth_remove_listener(int eth_type)
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113 {
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114 int i;
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115
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116 for (i = 0; i < NUM_EXTRA_HANDLERS; i++) {
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117 if (eth_handlers[i].type == eth_type) {
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118 eth_handlers[i].type = 0;
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119 }
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120 }
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121 }
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122
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123 /*
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124 * Non-blocking poll of ethernet link. Process packets until no more
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125 * are available.
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126 */
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127 void
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128 __enet_poll(void)
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129 {
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130 pktbuf_t *pkt;
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131 eth_header_t eth_hdr;
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132 int i, type;
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133 #ifdef DEBUG_PKT_EXHAUSTION
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134 static bool was_exhausted = false;
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135 #endif
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136
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137 while (true) {
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138 /*
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139 * Try to get a free pktbuf and return if none
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140 * are available.
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141 */
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142 if ((pkt = __pktbuf_alloc(ETH_MAX_PKTLEN)) == NULL) {
191
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143 #ifdef DEBUG_PKT_EXHAUSTION
156
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144 if (!was_exhausted) {
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145 int old = start_console(); // Force output to standard port
182
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146 diag_printf("__enet_poll: no more buffers\n");
156
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147 __pktbuf_dump();
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148 was_exhausted = true;
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149 end_console(old);
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150 }
191
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151 #endif
115
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152 return;
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153 }
191
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154 #ifdef DEBUG_PKT_EXHAUSTION
156
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155 was_exhausted = false; // Report the next time we're out of buffers
191
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156 #endif
115
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157
132
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158 if ((pkt->pkt_bytes = eth_drv_read((char *)&eth_hdr, (char *)pkt->buf,
115
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159 ETH_MAX_PKTLEN)) > 0) {
161
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160 #ifdef ENET_STATS
115
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161 ++num_received;
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162 #endif
151
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163 switch (type = ntohs(eth_hdr.type)) {
115
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164
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165 case ETH_TYPE_IP:
161
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166 #ifdef ENET_STATS
115
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167 ++num_ip;
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168 #endif
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169 pkt->ip_hdr = (ip_header_t *)pkt->buf;
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170 __ip_handler(pkt, &eth_hdr.source);
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171 break;
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172
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173 case ETH_TYPE_ARP:
161
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174 #ifdef ENET_STATS
115
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175 ++num_arp;
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176 #endif
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177 pkt->arp_hdr = (arp_header_t *)pkt->buf;
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178 __arp_handler(pkt);
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179 break;
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180
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181 #ifdef NET_SUPPORT_RARP
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182 case ETH_TYPE_RARP:
161
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183 #ifdef ENET_STATS
115
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184 ++num_rarp;
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185 #endif
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186 pkt->arp_hdr = (arp_header_t *)pkt->buf;
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187 __rarp_handler(pkt);
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188 break;
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189 #endif
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190
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191 default:
158
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192 if (type > 0x800) {
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193 for (i = 0; i < NUM_EXTRA_HANDLERS; i++) {
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194 if (eth_handlers[i].type == type) {
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195 (eth_handlers[i].handler)(pkt, &eth_hdr);
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196 }
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197 }
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198 }
115
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199 __pktbuf_free(pkt);
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200 break;
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201 }
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202 } else {
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203 __pktbuf_free(pkt);
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204 break;
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205 }
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206 }
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207 }
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208
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209
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210
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211 /*
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212 * Send an ethernet packet.
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213 */
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214 void
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215 __enet_send(pktbuf_t *pkt, enet_addr_t *dest, int eth_type)
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216 {
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217 eth_header_t eth_hdr;
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218
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219 // Set up ethernet header
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220 memcpy(&eth_hdr.destination, dest, sizeof(enet_addr_t));
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221 memcpy(&eth_hdr.source, __local_enet_addr, sizeof(enet_addr_t));
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222 eth_hdr.type = htons(eth_type);
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223
132
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224 eth_drv_write((char *)&eth_hdr, (char *)pkt->buf, pkt->pkt_bytes);
161
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225 #ifdef ENET_STATS
115
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226 ++num_transmitted;
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227 #endif
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228 }
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229
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230 #ifdef __LITTLE_ENDIAN__
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231
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232 unsigned long
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233 ntohl(unsigned long x)
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234 {
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235 return (((x & 0x000000FF) << 24) |
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236 ((x & 0x0000FF00) << 8) |
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237 ((x & 0x00FF0000) >> 8) |
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238 ((x & 0xFF000000) >> 24));
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239 }
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240
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241 unsigned long
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242 ntohs(unsigned short x)
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243 {
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244 return (((x & 0x00FF) << 8) |
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245 ((x & 0xFF00) >> 8));
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246 }
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247
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248 #endif