1 | /* -*- c++ -*- |
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2 | * |
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3 | * SOCLIB_LGPL_HEADER_BEGIN |
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4 | * |
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5 | * This file is part of SoCLib, GNU LGPLv2.1. |
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6 | * |
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7 | * SoCLib is free software; you can redistribute it and/or modify it |
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8 | * under the terms of the GNU Lesser General Public License as published |
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9 | * by the Free Software Foundation; version 2.1 of the License. |
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10 | * |
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11 | * SoCLib is distributed in the hope that it will be useful, but |
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12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 | * Lesser General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU Lesser General Public |
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17 | * License along with SoCLib; if not, write to the Free Software |
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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19 | * 02110-1301 USA |
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20 | * |
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21 | * SOCLIB_LGPL_HEADER_END |
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22 | * |
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23 | * Copyright (c) Telecom ParisTech |
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24 | * Alexandre Becoulet <alexandre.becoulet@enst.fr>, 2012 |
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25 | * |
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26 | * Maintainers: becoulet |
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27 | */ |
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28 | |
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29 | #include <unistd.h> |
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30 | #include <stdint.h> |
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31 | #include <fcntl.h> |
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32 | #include <string.h> |
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33 | #include <errno.h> |
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34 | |
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35 | #include <iostream> |
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36 | |
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37 | #include "register.h" |
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38 | #include "../include/vci_ethernet.h" |
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39 | #include "ethernet.h" |
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40 | |
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41 | #define CHUNCK_SIZE (64) // Width of a cache line |
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42 | #define CHUNCK_MASK ((~0ULL) << (6)) // MASK of a cache line |
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43 | |
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44 | //#define SOCLIB_MODULE_DEBUG |
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45 | |
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46 | namespace soclib { namespace caba { |
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47 | |
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48 | #define tmpl(t) template<typename vci_param> t VciEthernet<vci_param> |
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49 | |
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50 | tmpl(bool)::on_write(int seg, typename vci_param::addr_t addr, typename vci_param::data_t data, int be) |
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51 | { |
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52 | int cell = (int)addr / vci_param::B; |
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53 | |
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54 | #ifdef SOCLIB_MODULE_DEBUG |
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55 | std::cout |
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56 | << name() |
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57 | << ": write config register " |
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58 | << cell |
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59 | << " with data 0x" |
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60 | << std::hex << data |
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61 | << std::dec |
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62 | << std::endl; |
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63 | #endif |
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64 | |
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65 | fifo_entry_t *f; |
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66 | |
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67 | switch ((enum SoclibEthernetRegisters)cell) |
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68 | { |
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69 | case ETHERNET_TX_SIZE: |
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70 | _tx_size = std::min((int)data, VCI_ETHERNET_MAX_PKT_SIZE); |
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71 | return true; |
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72 | |
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73 | case ETHERNET_TX_FIFO: |
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74 | if (_tx_count >= VCI_ETHERNET_FIFO_SIZE) { |
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75 | std::cout << name() << ": TX fifo full, can not push more packets!" << std::endl; |
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76 | return false; |
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77 | } |
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78 | |
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79 | f = _tx_fifo + (_tx_start + _tx_count++) % VCI_ETHERNET_FIFO_SIZE; |
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80 | _tx_waiting++; |
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81 | |
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82 | f->addr = data; |
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83 | f->size = _tx_size; |
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84 | f->status = 0; |
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85 | f->data = (uint8_t*)malloc(_tx_size); |
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86 | return true; |
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87 | |
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88 | case ETHERNET_RX_SIZE: |
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89 | _rx_size = std::min((int)data, VCI_ETHERNET_MAX_PKT_SIZE); |
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90 | return true; |
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91 | |
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92 | case ETHERNET_RX_FIFO: |
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93 | if (_rx_count >= VCI_ETHERNET_FIFO_SIZE) { |
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94 | std::cout << name() << ": RX fifo full, can not push more packet buffers!" << std::endl; |
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95 | return false; |
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96 | } |
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97 | |
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98 | f = _rx_fifo + (_rx_start + _rx_count++) % VCI_ETHERNET_FIFO_SIZE; |
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99 | _rx_free++; |
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100 | |
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101 | f->addr = data; |
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102 | f->size = _rx_size; |
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103 | f->status = 0; |
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104 | f->data = (uint8_t*)malloc(_rx_size); |
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105 | return true; |
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106 | |
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107 | case ETHERNET_CTRL: |
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108 | if (data & ETHERNET_CTRL_RESET) |
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109 | _soft_reset = true; |
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110 | if (data & ETHERNET_CTRL_TX_IRQ) |
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111 | _tx_irq_en = true; |
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112 | else |
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113 | _tx_irq_en = false; |
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114 | if (data & ETHERNET_CTRL_RX_IRQ) |
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115 | _rx_irq_en = true; |
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116 | else |
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117 | _rx_irq_en = false; |
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118 | if (data & ETHERNET_CTRL_LINK_IRQ) |
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119 | _link_irq_en = true; |
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120 | else |
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121 | _link_irq_en = false; |
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122 | return true; |
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123 | |
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124 | default: |
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125 | return false; |
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126 | } |
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127 | } |
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128 | |
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129 | tmpl(bool)::on_read(int seg, typename vci_param::addr_t addr, typename vci_param::data_t &data) |
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130 | { |
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131 | int cell = (int)addr / vci_param::B; |
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132 | |
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133 | #ifdef SOCLIB_MODULE_DEBUG |
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134 | std::cout |
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135 | << name() |
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136 | << ": read config register " |
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137 | << cell |
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138 | << std::endl; |
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139 | #endif |
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140 | |
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141 | fifo_entry_t *f; |
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142 | |
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143 | switch ((enum SoclibEthernetRegisters)cell) { |
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144 | case ETHERNET_TX_FIFO: |
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145 | if (_tx_done == 0) { |
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146 | data = 0; |
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147 | } else { |
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148 | f = _tx_fifo + _tx_start++ % VCI_ETHERNET_FIFO_SIZE; |
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149 | _tx_count--; |
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150 | _tx_done--; |
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151 | data = f->status; |
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152 | free(f->data); |
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153 | } |
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154 | return true; |
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155 | |
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156 | case ETHERNET_RX_SIZE: |
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157 | if (_rx_done == 0) { |
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158 | data = 0; |
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159 | } else { |
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160 | f = _rx_fifo + _rx_start % VCI_ETHERNET_FIFO_SIZE; |
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161 | data = f->size; |
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162 | } |
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163 | return true; |
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164 | |
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165 | case ETHERNET_RX_FIFO: |
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166 | if (_rx_done == 0) { |
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167 | data = 0; |
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168 | } else { |
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169 | f = _rx_fifo + _rx_start++ % VCI_ETHERNET_FIFO_SIZE; |
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170 | _rx_count--; |
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171 | _rx_done--; |
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172 | free(f->data); |
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173 | data = f->status; |
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174 | } |
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175 | return true; |
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176 | |
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177 | case ETHERNET_STATUS: |
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178 | data = 0; |
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179 | _link_changed = false; |
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180 | if (_link_up) |
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181 | data |= ETHERNET_ST_LINK_UP; |
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182 | if (_rx_done > 0) |
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183 | data |= ETHERNET_ST_RX_DONE; |
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184 | if (_tx_done > 0) |
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185 | data |= ETHERNET_ST_TX_DONE; |
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186 | return true; |
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187 | |
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188 | case ETHERNET_FIFO_SIZE: |
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189 | data = VCI_ETHERNET_FIFO_SIZE; |
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190 | return true; |
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191 | |
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192 | case ETHERNET_MAC_LOW: |
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193 | data = _mac[0] | (_mac[1] << 8) | (_mac[2] << 16) | (_mac[3] << 24); |
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194 | return true; |
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195 | |
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196 | case ETHERNET_MAC_HIGH: |
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197 | data = _mac[4] | (_mac[5] << 8); |
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198 | return true; |
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199 | |
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200 | default: |
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201 | return false; |
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202 | } |
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203 | } |
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204 | |
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205 | tmpl(void)::write_finish( req_t *req ) |
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206 | { |
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207 | fifo_entry_t *f = _rx_fifo + (_rx_start + _rx_count - _rx_free - 1) % VCI_ETHERNET_FIFO_SIZE; |
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208 | |
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209 | assert(req == f->rd_req); |
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210 | delete req; |
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211 | |
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212 | if (req->failed()) { |
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213 | std::cout << name() << ": RX dma write error for packet @" << f->addr << std::endl; |
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214 | f->status = ETHERNET_RX_DMA_ERR; |
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215 | _rx_done++; |
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216 | _dma_busy = false; |
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217 | |
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218 | } else if ((unsigned)f->dma_offset >= f->size) { |
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219 | #ifdef SOCLIB_MODULE_DEBUG |
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220 | std::cout << name() << ": RX dma done for packet @" << f->addr << std::endl; |
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221 | #endif |
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222 | f->status = ETHERNET_RX_DONE; |
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223 | _rx_done++; |
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224 | _dma_busy = false; |
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225 | |
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226 | } else { |
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227 | int chunck_size = std::min((unsigned)CHUNCK_SIZE, f->size - f->dma_offset); |
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228 | f->wr_req = new VciInitSimpleWriteReq<vci_param>(f->addr + f->dma_offset, f->data + f->dma_offset, chunck_size); |
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229 | f->dma_offset += chunck_size; |
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230 | f->wr_req->setDone(this, ON_T(write_finish)); |
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231 | f->wr_req->setPacket(0x4); |
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232 | m_vci_init_fsm.doReq(f->wr_req); |
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233 | } |
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234 | } |
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235 | |
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236 | tmpl(void)::read_finish( req_t *req ) |
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237 | { |
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238 | fifo_entry_t *f = _tx_fifo + (_tx_start + _tx_count - _tx_waiting - 1) % VCI_ETHERNET_FIFO_SIZE; |
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239 | |
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240 | assert(req == f->rd_req); |
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241 | delete req; |
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242 | |
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243 | if (req->failed()) { |
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244 | std::cout << name() << ": TX dma read error for packet @" << f->addr << std::endl; |
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245 | f->status = ETHERNET_TX_DMA_ERR; |
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246 | _tx_done++; |
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247 | _dma_busy = false; |
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248 | |
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249 | } else if ((unsigned)f->dma_offset >= f->size) { |
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250 | #ifdef SOCLIB_MODULE_DEBUG |
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251 | std::cout << name() << ": TX dma done for packet @" << f->addr << std::endl; |
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252 | #endif |
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253 | f->status = ETHERNET_TX_DONE; |
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254 | |
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255 | if (!_link_up || ::write(_fd, f->data, f->size) != f->size) { |
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256 | std::cout << name() << ": TX tap write error for packet @" << f->addr << std::endl; |
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257 | f->status = ETHERNET_TX_PHY_ERR; |
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258 | _link_check_counter = 1; |
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259 | } |
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260 | |
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261 | _tx_done++; |
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262 | _dma_busy = false; |
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263 | |
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264 | } else { |
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265 | int chunck_size = std::min((unsigned)CHUNCK_SIZE, f->size - f->dma_offset); |
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266 | f->rd_req = new VciInitSimpleReadReq<vci_param>(f->data + f->dma_offset, f->addr + f->dma_offset, chunck_size); |
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267 | f->dma_offset += chunck_size; |
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268 | f->rd_req->setDone(this, ON_T(read_finish)); |
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269 | m_vci_init_fsm.doReq(f->rd_req); |
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270 | } |
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271 | } |
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272 | |
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273 | tmpl(void)::cleanup_fifos() |
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274 | { |
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275 | for (int i = 0; i < _rx_count; i++) { |
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276 | fifo_entry_t *f = _rx_fifo + (_rx_start + i) % VCI_ETHERNET_FIFO_SIZE; |
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277 | free(f->data); |
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278 | } |
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279 | |
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280 | for (int i = 0; i < _tx_count; i++) { |
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281 | fifo_entry_t *f = _tx_fifo + (_tx_start + i) % VCI_ETHERNET_FIFO_SIZE; |
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282 | free(f->data); |
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283 | } |
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284 | } |
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285 | |
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286 | tmpl(void)::transition() |
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287 | { |
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288 | if (!p_resetn || _soft_reset) { |
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289 | m_vci_target_fsm.reset(); |
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290 | m_vci_init_fsm.reset(); |
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291 | _soft_reset = false; |
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292 | |
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293 | cleanup_fifos(); |
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294 | |
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295 | _rx_start = _rx_free = _rx_done = _rx_count = 0; |
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296 | _tx_start = _tx_waiting = _tx_done = _tx_count = 0; |
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297 | _rx_irq_en = _tx_irq_en = _link_irq_en = false; |
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298 | _link_check_counter = 1; |
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299 | _link_changed = _link_up = false; |
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300 | _dma_busy = false; |
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301 | return; |
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302 | } |
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303 | |
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304 | if (_fd >= 0 && --_link_check_counter <= 0) { |
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305 | _link_check_counter = 100000; |
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306 | |
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307 | int sock = socket(AF_INET, SOCK_DGRAM, 0); |
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308 | |
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309 | if (sock >= 0) { |
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310 | if (ioctl(sock, SIOCGIFFLAGS, &_tap_ifr) < 0) { |
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311 | std::cout << name() << ": link status check error: " << _tap_ifr.ifr_flags << std::endl; |
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312 | } else if (_link_up != !!(_tap_ifr.ifr_flags & IFF_UP)) { |
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313 | _link_up = !_link_up; |
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314 | _link_changed = true; |
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315 | #ifdef SOCLIB_MODULE_DEBUG |
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316 | std::cout << name() << ": link status changed to: " << (_link_up ? "up" : "down") << std::endl; |
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317 | #endif |
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318 | } |
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319 | close(sock); |
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320 | } |
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321 | } |
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322 | |
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323 | if (!_dma_busy) { |
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324 | |
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325 | if (_tx_waiting > 0) { |
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326 | |
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327 | fifo_entry_t *f = _tx_fifo + (_tx_start + _tx_count - _tx_waiting--) % VCI_ETHERNET_FIFO_SIZE; |
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328 | |
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329 | // start DMA read |
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330 | int chunck_size = std::min((unsigned)CHUNCK_SIZE, f->size); |
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331 | if ((f->addr & CHUNCK_MASK) != ((f->addr + chunck_size) & CHUNCK_MASK)) { |
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332 | chunck_size = ((f->addr & CHUNCK_MASK) + CHUNCK_SIZE) - f->addr; |
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333 | } |
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334 | f->rd_req = new VciInitSimpleReadReq<vci_param>(f->data, f->addr, chunck_size); |
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335 | f->dma_offset = chunck_size; |
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336 | f->rd_req->setDone(this, ON_T(read_finish)); |
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337 | m_vci_init_fsm.doReq(f->rd_req); |
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338 | _dma_busy = true; |
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339 | |
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340 | #ifdef SOCLIB_MODULE_DEBUG |
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341 | std::cout << name() << ": started TX dma read @" << f->addr << ", " << f->size << " bytes " << std::endl; |
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342 | #endif |
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343 | } else if (_rx_free > 0 && _link_up) { |
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344 | |
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345 | fifo_entry_t *f = _rx_fifo + (_rx_start + _rx_count - _rx_free) % VCI_ETHERNET_FIFO_SIZE; |
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346 | int rd = ::read(_fd, f->data, f->size); |
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347 | |
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348 | if (rd < 0 && errno != EAGAIN) { |
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349 | f->status = ETHERNET_RX_PHY_ERR; |
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350 | _rx_done++; |
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351 | std::cout << name() << ": tap read error on RX" << std::endl; |
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352 | _link_check_counter = 1; |
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353 | |
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354 | } else if (rd > 0) { |
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355 | if (_rx_free > 0) { |
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356 | f->size = rd; |
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357 | _rx_free--; |
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358 | |
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359 | // start DMA write |
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360 | int chunck_size = std::min((unsigned)CHUNCK_SIZE, f->size); |
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361 | if ((f->addr & CHUNCK_MASK) != ((f->addr + chunck_size) & CHUNCK_MASK)) { |
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362 | chunck_size = ((f->addr & CHUNCK_MASK) + CHUNCK_SIZE) - f->addr; |
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363 | } |
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364 | f->wr_req = new VciInitSimpleWriteReq<vci_param>(f->addr, f->data, chunck_size); |
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365 | f->dma_offset = chunck_size; |
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366 | f->wr_req->setDone(this, ON_T(write_finish)); |
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367 | f->wr_req->setPacket(0x4); |
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368 | m_vci_init_fsm.doReq(f->wr_req); |
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369 | _dma_busy = true; |
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370 | |
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371 | #ifdef SOCLIB_MODULE_DEBUG |
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372 | std::cout << name() << ": started RX dma write @" << f->addr << ", " << f->size << " bytes " << std::endl; |
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373 | #endif |
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374 | } |
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375 | else { |
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376 | std::cout << name() << ": No rx buffer free so paquet is dropped" << std::endl; |
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377 | } |
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378 | } |
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379 | } |
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380 | } |
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381 | |
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382 | m_vci_target_fsm.transition(); |
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383 | m_vci_init_fsm.transition(); |
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384 | } |
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385 | |
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386 | tmpl(void)::genMoore() |
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387 | { |
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388 | m_vci_target_fsm.genMoore(); |
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389 | m_vci_init_fsm.genMoore(); |
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390 | |
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391 | p_irq = (_rx_irq_en && _rx_done > 0) || (_tx_irq_en && _tx_done > 0) || (_link_changed && _link_irq_en); |
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392 | } |
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393 | |
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394 | tmpl(/**/)::VciEthernet(sc_module_name name, const MappingTable &mt, |
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395 | const IntTab &srcid, const IntTab &tgtid, |
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396 | const std::string &if_name) |
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397 | : caba::BaseModule(name), |
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398 | m_vci_target_fsm(p_vci_target, mt.getSegmentList(tgtid)), |
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399 | m_vci_init_fsm(p_vci_initiator, mt.indexForId(srcid)), |
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400 | p_clk("clk"), |
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401 | p_resetn("resetn"), |
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402 | p_vci_target("vci_target"), |
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403 | p_vci_initiator("vci_initiator"), |
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404 | p_irq("irq") |
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405 | { |
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406 | m_vci_target_fsm.on_read_write(on_read, on_write); |
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407 | _fd = open("/dev/net/tun", O_RDWR); |
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408 | |
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409 | if ( _fd < 0 ) { |
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410 | std::cerr << name << ": Unable to open /dev/net/tun" << std::endl; |
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411 | } else { |
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412 | int flags = fcntl(_fd, F_GETFL, 0); |
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413 | fcntl(_fd, F_SETFL, flags | O_NONBLOCK); |
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414 | |
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415 | memset((void*)&_tap_ifr, 0, sizeof(_tap_ifr)); |
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416 | _tap_ifr.ifr_flags = IFF_TAP | IFF_NO_PI; |
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417 | strncpy(_tap_ifr.ifr_name, if_name.c_str(), IFNAMSIZ); |
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418 | |
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419 | |
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420 | if (ioctl(_fd, TUNSETIFF, (void *) &_tap_ifr) < 0) { |
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421 | close(_fd); |
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422 | _fd = -1; |
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423 | std::cerr << name << ": Unable to setup tap interface, check privileges." |
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424 | #ifdef __linux__ |
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425 | << " (try: sudo setcap cap_net_admin=eip ./system.x)" |
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426 | #endif |
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427 | << std::endl; |
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428 | } |
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429 | flags = 2; |
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430 | if (ioctl(_fd, TUNSETDEBUG, (void *) &flags) < 0) { |
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431 | std::cerr << "Warning couldn't use debug option for TAP" << std::endl; |
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432 | } |
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433 | |
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434 | /* ioctl(_fd, SIOCGIFHWADDR, &_tap_ifr); |
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435 | memcpy(_mac, _tap_ifr.ifr_hwaddr.sa_data, 6);*/ |
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436 | srand(time(0) * getpid()); |
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437 | _mac[0] = 0x00; |
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438 | _mac[1] = 0x16; |
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439 | _mac[2] = 0x3e; |
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440 | _mac[3] = rand(); |
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441 | _mac[4] = rand(); |
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442 | _mac[5] = rand(); |
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443 | } |
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444 | |
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445 | _link_check_counter = 1; |
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446 | _rx_start = _rx_free = _rx_done = _rx_count = 0; |
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447 | _tx_start = _tx_waiting = _tx_done = _tx_count = 0; |
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448 | _dma_busy = false; |
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449 | _link_up = false; |
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450 | |
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451 | SC_METHOD(transition); |
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452 | dont_initialize(); |
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453 | sensitive << p_clk.pos(); |
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454 | |
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455 | SC_METHOD(genMoore); |
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456 | dont_initialize(); |
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457 | sensitive << p_clk.neg(); |
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458 | } |
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459 | |
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460 | tmpl(/**/)::~VciEthernet() |
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461 | { |
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462 | cleanup_fifos(); |
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463 | |
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464 | if (_fd >= 0) |
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465 | close(_fd); |
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466 | } |
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467 | |
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468 | }} |
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469 | |
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470 | // Local Variables: |
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471 | // tab-width: 4 |
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472 | // c-basic-offset: 4 |
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473 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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474 | // indent-tabs-mode: nil |
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475 | // End: |
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476 | |
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477 | // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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478 | |
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