1 | |
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2 | /* |
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3 | * dev_nic.c - NIC (Network Controler) generic device API implementation. |
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4 | * |
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5 | * Author Alain Greiner (2016,2017,2018,2019,2020) |
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6 | * |
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7 | * Copyright (c) UPMC Sorbonne Universites |
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8 | * |
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9 | * This file is part of ALMOS-MKH. |
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10 | * |
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11 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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12 | * under the terms of the GNU General Public License as published by |
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13 | * the Free Software Foundation; version 2.0 of the License. |
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14 | * |
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15 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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18 | * General Public License for more details. |
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19 | * |
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20 | * You should have received a copy of the GNU General Public License |
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21 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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22 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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23 | */ |
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24 | |
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25 | #include <hal_kernel_types.h> |
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26 | #include <hal_special.h> |
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27 | #include <hal_uspace.h> |
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28 | #include <remote_buf.h> |
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29 | #include <memcpy.h> |
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30 | #include <printk.h> |
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31 | #include <chdev.h> |
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32 | #include <thread.h> |
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33 | #include <ksocket.h> |
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34 | #include <hal_drivers.h> |
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35 | #include <dev_nic.h> |
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36 | #include <vfs.h> |
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37 | #include <shared_socket.h> |
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38 | |
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39 | ///////////////////////////////////////////////////////////////////////////////////////// |
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40 | // Extern global variables |
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41 | ///////////////////////////////////////////////////////////////////////////////////////// |
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42 | |
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43 | extern chdev_directory_t chdev_dir; // allocated in kernel_init.c |
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44 | |
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45 | //////////////////////////////////// |
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46 | void dev_nic_init( chdev_t * chdev ) |
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47 | { |
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48 | thread_t * new_thread; |
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49 | error_t error; |
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50 | |
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51 | // get "channel" & "is_rx" fields from chdev descriptor |
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52 | uint32_t channel = chdev->channel; |
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53 | bool_t is_rx = chdev->is_rx; |
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54 | |
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55 | // set chdev name |
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56 | if( is_rx ) snprintf( chdev->name , 16 , "nic%d_rx" , channel ); |
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57 | else snprintf( chdev->name , 16 , "nic%d_tx" , channel ); |
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58 | |
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59 | // initialize the root of the listening sockets list |
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60 | xlist_root_init( XPTR( local_cxy , &chdev->ext.nic.root ) ); |
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61 | |
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62 | // initialize the lock protecting this list |
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63 | remote_busylock_init( XPTR( local_cxy , &chdev->ext.nic.lock ), |
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64 | LOCK_LISTEN_SOCKET ); |
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65 | |
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66 | // call driver init function for this chdev |
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67 | hal_drivers_nic_init( chdev ); |
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68 | |
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69 | // select a core to execute the NIC server thread |
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70 | lid_t lid = cluster_select_local_core( local_cxy ); |
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71 | |
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72 | // bind the NIC IRQ to the selected core |
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73 | dev_pic_bind_irq( lid , chdev ); |
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74 | |
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75 | // build pointer on server function |
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76 | void * func = is_rx ? &dev_nic_rx_server : &dev_nic_tx_server; |
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77 | |
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78 | // create server thread |
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79 | error = thread_kernel_create( &new_thread, |
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80 | THREAD_DEV, |
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81 | func, |
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82 | chdev, |
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83 | lid ); |
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84 | if( error ) |
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85 | { |
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86 | printk("\n[PANIC] in %s : cannot create server thread\n", __FUNCTION__ ); |
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87 | return; |
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88 | } |
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89 | |
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90 | // set "server" field in chdev descriptor |
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91 | chdev->server = new_thread; |
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92 | |
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93 | // set "chdev" field in thread descriptor |
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94 | new_thread->chdev = chdev; |
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95 | |
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96 | // unblock server thread |
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97 | thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL ); |
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98 | |
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99 | #if (DEBUG_DEV_NIC_TX || DEBUG_DEV_NIC_RX) |
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100 | thread_t * this = CURRENT_THREAD; |
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101 | if( is_rx ) |
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102 | printk("\n[%s] thread[%x,%x] initialized NIC_RX[%d] / server %x\n", |
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103 | __FUNCTION__, this->process->pid, this->trdid, channel, new_thread->trdid ); |
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104 | else |
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105 | printk("\n[%s] thread[%x,%x] initialized NIC_TX[%d] / server %x\n", |
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106 | __FUNCTION__, this->process->pid, this->trdid, channel, new_thread->trdid ); |
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107 | #endif |
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108 | |
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109 | } // end dev_nic_init() |
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110 | |
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111 | |
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112 | /////////////////////////////////////////////////////////////////////////////////////////// |
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113 | // Functions directly called by the client threads |
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114 | /////////////////////////////////////////////////////////////////////////////////////////// |
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115 | |
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116 | //////////////////////////////////////// |
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117 | uint32_t dev_nic_get_key( uint32_t addr, |
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118 | uint16_t port ) |
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119 | { |
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120 | thread_t * this = CURRENT_THREAD; |
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121 | |
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122 | xptr_t dev_xp = chdev_dir.nic_tx[0]; |
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123 | chdev_t * dev_ptr = GET_PTR( dev_xp ); |
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124 | |
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125 | if( dev_xp == XPTR_NULL ) return -1; |
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126 | |
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127 | // set command arguments in client thread descriptor |
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128 | this->nic_cmd.buffer = (uint8_t *)addr; |
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129 | this->nic_cmd.length = (uint32_t)port; |
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130 | this->nic_cmd.dev_xp = dev_xp; |
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131 | this->nic_cmd.type = NIC_CMD_GET_KEY; |
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132 | |
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133 | // call driver |
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134 | dev_ptr->cmd( XPTR( local_cxy , this ) ); |
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135 | |
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136 | // get "status" |
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137 | return this->nic_cmd.status; |
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138 | } |
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139 | |
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140 | ////////////////////////////////////////// |
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141 | error_t dev_nic_set_run( uint32_t channel, |
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142 | uint32_t run ) |
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143 | { |
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144 | thread_t * this = CURRENT_THREAD; |
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145 | |
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146 | if( channel >= LOCAL_CLUSTER->nb_nic_channels ) return -1; |
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147 | |
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148 | xptr_t dev_xp = chdev_dir.nic_tx[0]; |
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149 | chdev_t * dev_ptr = GET_PTR( dev_xp ); |
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150 | |
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151 | if( dev_xp == XPTR_NULL ) return -1; |
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152 | |
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153 | // set command arguments in client thread descriptor |
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154 | this->nic_cmd.dev_xp = dev_xp; |
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155 | this->nic_cmd.type = NIC_CMD_SET_RUN; |
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156 | this->nic_cmd.length = channel; |
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157 | this->nic_cmd.status = run; |
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158 | |
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159 | // call driver |
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160 | dev_ptr->cmd( XPTR( local_cxy , this ) ); |
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161 | |
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162 | // return "error" |
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163 | return this->nic_cmd.error; |
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164 | } |
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165 | |
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166 | ////////////////////////////////// |
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167 | error_t dev_nic_get_instru( void ) |
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168 | { |
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169 | thread_t * this = CURRENT_THREAD; |
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170 | |
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171 | xptr_t dev_xp = chdev_dir.nic_tx[0]; |
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172 | chdev_t * dev_ptr = GET_PTR( dev_xp ); |
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173 | |
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174 | if( dev_xp == XPTR_NULL ) return -1; |
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175 | |
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176 | // set command arguments in client thread descriptor |
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177 | this->nic_cmd.dev_xp = dev_xp; |
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178 | this->nic_cmd.type = NIC_CMD_GET_INSTRU; |
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179 | |
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180 | // call driver |
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181 | dev_ptr->cmd( XPTR( local_cxy , this ) ); |
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182 | |
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183 | // return "error" |
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184 | return this->nic_cmd.error; |
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185 | } |
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186 | |
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187 | //////////////////////////////////// |
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188 | error_t dev_nic_clear_instru( void ) |
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189 | { |
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190 | thread_t * this = CURRENT_THREAD; |
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191 | |
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192 | xptr_t dev_xp = chdev_dir.nic_tx[0]; |
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193 | chdev_t * dev_ptr = GET_PTR( dev_xp ); |
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194 | |
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195 | if( dev_xp == XPTR_NULL ) return -1; |
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196 | |
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197 | // set command arguments in client thread descriptor |
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198 | this->nic_cmd.dev_xp = dev_xp; |
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199 | this->nic_cmd.type = NIC_CMD_GET_INSTRU; |
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200 | |
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201 | // call driver |
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202 | dev_ptr->cmd( XPTR( local_cxy , this ) ); |
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203 | |
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204 | // return "error" |
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205 | return this->nic_cmd.error; |
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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 | // Static functions called by the NIC_RX server & NIC_TX server threads |
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211 | //////////////////////////////////////////////////////////////////////////////////////////// |
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212 | |
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213 | //////////////////////////////////////////////////////////////////////////////////////////// |
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214 | // This static function is used by the dev_nic_rx_handle_tcp() function |
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215 | // to check acceptability of a given sequence number. It returns true when |
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216 | // the <seq> argument is contained in a wrap-around window defined by the |
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217 | // <min> and <max> arguments. The window wrap-around when (min > max). |
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218 | //////////////////////////////////////////////////////////////////////////////////////////// |
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219 | // @ seq : [in] value to be checked. |
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220 | // @ min : [in] first base. |
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221 | // @ max : [in] window size. |
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222 | //////////////////////////////////////////////////////////////////////////////////////////// |
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223 | static inline bool_t is_in_window( uint32_t seq, |
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224 | uint32_t min, |
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225 | uint32_t max ) |
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226 | { |
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227 | if( max >= min ) // no wrap_around => only one window [min,max] |
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228 | { |
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229 | return( (seq >= min) && (seq <= max) ); |
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230 | } |
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231 | else // window wrap-around => two windows [min,0xFFFFFFFF] and [0,max] |
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232 | { |
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233 | return( (seq <= max) || (seq >= min) ); |
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234 | } |
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235 | } |
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236 | |
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237 | //////////////////////////////////////////////////////////////////////////////////////// |
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238 | // This static function computes the checksum for an IP packet header. |
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239 | // The "checksum" field itself is not taken into account for this computation. |
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240 | //////////////////////////////////////////////////////////////////////////////////////// |
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241 | // @ buffer : [in] pointer on IP packet header (20 bytes) |
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242 | // @ return the checksum value on 16 bits |
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243 | //////////////////////////////////////////////////////////////////////////////////////// |
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244 | static uint16_t dev_nic_ip_checksum( uint8_t * buffer ) |
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245 | { |
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246 | uint32_t i; |
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247 | uint32_t cs; // 32 bits accumulator |
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248 | uint16_t * buf; |
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249 | |
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250 | buf = (uint16_t *)buffer; |
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251 | |
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252 | // compute checksum |
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253 | for( i = 0 , cs = 0 ; i < 10 ; i++ ) |
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254 | { |
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255 | if( i != 5 ) cs += buf[i]; |
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256 | } |
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257 | |
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258 | // one's complement |
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259 | return ~cs; |
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260 | } |
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261 | |
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262 | //////////////////////////////////////////////////////////////////////////////////////// |
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263 | // This static function computes the checksum for an UDP packet defined by |
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264 | // the <buffer> and <size> arguments. |
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265 | //////////////////////////////////////////////////////////////////////////////////////// |
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266 | // @ buffer : [in] pointer on UDP packet base. |
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267 | // @ size : [in] number of bytes in this packet (including header). |
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268 | // @ return the checksum value on 16 bits |
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269 | //////////////////////////////////////////////////////////////////////////////////////// |
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270 | static uint16_t dev_nic_udp_checksum( uint8_t * buffer, |
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271 | uint32_t size ) |
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272 | { |
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273 | uint32_t i; |
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274 | uint32_t carry; |
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275 | uint32_t cs; // 32 bits accumulator |
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276 | uint16_t * buf; |
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277 | uint32_t max; // number of uint16_t in packet |
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278 | |
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279 | // compute max & buf |
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280 | buf = (uint16_t *)buffer; |
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281 | max = size >> 1; |
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282 | |
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283 | // extend buffer[] if required |
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284 | if( size & 1 ) |
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285 | { |
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286 | max++; |
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287 | buffer[size] = 0; |
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288 | } |
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289 | |
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290 | // compute checksum for UDP packet |
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291 | for( i = 0 , cs = 0 ; i < size ; i++ ) cs += buf[i]; |
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292 | |
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293 | // handle carry |
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294 | carry = (cs >> 16); |
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295 | if( carry ) |
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296 | { |
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297 | cs += carry; |
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298 | carry = (cs >> 16); |
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299 | if( carry ) cs += carry; |
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300 | } |
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301 | |
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302 | // one's complement |
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303 | return ~cs; |
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304 | } |
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305 | |
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306 | //////////////////////////////////////////////////////////////////////////////////////// |
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307 | // This static function computes the checksum for a TCP segment defined by the <buffer> |
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308 | // and <size> arguments. It includes the pseudo header defined by the <src_ip_addr>, |
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309 | // <dst_ip_addr>, <size> arguments, and by the TCP_PROTOCOL code. |
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310 | //////////////////////////////////////////////////////////////////////////////////////// |
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311 | // @ buffer : [in] pointer on TCP segment base. |
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312 | // @ tcp_length : [in] number of bytes in this TCP segment (including header). |
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313 | // @ src_ip_addr : [in] source IP address (pseudo header) |
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314 | // @ dst_ip_addr : [in] destination IP address (pseudo header) |
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315 | // @ return the checksum value on 16 bits |
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316 | //////////////////////////////////////////////////////////////////////////////////////// |
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317 | static uint16_t dev_nic_tcp_checksum( uint8_t * buffer, |
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318 | uint32_t tcp_length, |
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319 | uint32_t src_ip_addr, |
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320 | uint32_t dst_ip_addr ) |
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321 | { |
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322 | uint32_t i; |
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323 | uint32_t carry; |
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324 | uint32_t cs; // 32 bits accumulator |
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325 | uint16_t * buf; |
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326 | uint32_t max; // number of uint16_t in segment |
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327 | |
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328 | // compute max & buf |
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329 | buf = (uint16_t *)buffer; |
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330 | max = tcp_length >> 1; |
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331 | |
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332 | // extend buffer[] if required |
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333 | if( tcp_length & 1 ) |
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334 | { |
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335 | max++; |
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336 | buffer[tcp_length] = 0; |
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337 | } |
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338 | |
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339 | // compute checksum for TCP segment |
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340 | for( i = 0 , cs = 0 ; i < tcp_length ; i++ ) cs += buf[i]; |
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341 | |
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342 | // complete checksum for pseudo-header |
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343 | cs += src_ip_addr; |
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344 | cs += dst_ip_addr; |
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345 | cs += PROTOCOL_TCP; |
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346 | cs += tcp_length; |
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347 | |
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348 | // handle carry |
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349 | carry = (cs >> 16); |
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350 | if( carry ) |
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351 | { |
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352 | cs += carry; |
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353 | carry = (cs >> 16); |
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354 | if( carry ) cs += carry; |
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355 | } |
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356 | |
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357 | // one's complement |
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358 | return ~cs; |
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359 | } |
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360 | |
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361 | /////////////////////////////////////////////////////////////////////////////////////////// |
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362 | // This static function can be called by the NIC_TX or NIC_RX server threads to unblock |
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363 | // the TX client thread after completion (success or error) of a TX command registered |
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364 | // in a socket identified by the <socket_xp> argument. The <status> argument defines |
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365 | // the command success/failure status: a null value signals a success, a non-null value |
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366 | // signals a failure. For all commands, it copies the status value in the tx_sts field, |
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367 | // and print an error message on TXT0 in case of failure. |
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368 | /////////////////////////////////////////////////////////////////////////////////////////// |
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369 | // @ socket_xp : [in] extended pointer on socket |
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370 | // @ status : [in] command status (see above) |
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371 | /////////////////////////////////////////////////////////////////////////////////////////// |
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372 | static void dev_nic_unblock_tx_client( xptr_t socket_xp, |
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373 | int32_t status ) |
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374 | { |
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375 | // get socket thread cluster and local pointer |
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376 | socket_t * socket_ptr = GET_PTR( socket_xp ); |
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377 | cxy_t socket_cxy = GET_CXY( socket_xp ); |
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378 | |
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379 | if( status != CMD_STS_SUCCESS ) |
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380 | { |
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381 | uint32_t sock_state = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->state )); |
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382 | uint32_t cmd_type = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->tx_cmd )); |
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383 | pid_t pid = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->pid )); |
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384 | fdid_t fdid = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->fdid )); |
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385 | |
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386 | printk("\n[ERROR] reported by %s : socket[%x,%d] / %s / cmd %s / error %s \n", |
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387 | __FUNCTION__, pid, fdid, socket_state_str(sock_state), |
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388 | socket_cmd_type_str(cmd_type), socket_cmd_sts_str(status) ); |
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389 | } |
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390 | |
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391 | // set tx_sts field in socket descriptor |
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392 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_sts ) , status ); |
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393 | |
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394 | // get extended point on TX client thread |
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395 | xptr_t client_xp = hal_remote_l64( XPTR( socket_cxy , &socket_ptr->tx_client )); |
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396 | |
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397 | // unblock the client thread |
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398 | thread_unblock( client_xp , THREAD_BLOCKED_IO ); |
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399 | |
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400 | } // end dev_nic_unblock_tx_client() |
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401 | |
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402 | /////////////////////////////////////////////////////////////////////////////////////////// |
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403 | // This static function can be called by the NIC_TX or NIC_RX server threads to unblock |
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404 | // the RX client thread after completion (success or error) of an RX command registered |
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405 | // in a socket identified by the <socket_xp> argument. The <status> argument defines |
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406 | // the command success/failure status: a null value signals a success, a non-null value |
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407 | // signals a failure. For all commands, it copies the status value in the rx_sts field, |
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408 | // and print an error message on TXT0 in case of failure. |
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409 | /////////////////////////////////////////////////////////////////////////////////////////// |
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410 | // @ socket_xp : [in] extended pointer on socket |
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411 | // @ status : [in] command status (see above) |
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412 | /////////////////////////////////////////////////////////////////////////////////////////// |
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413 | static void dev_nic_unblock_rx_client( xptr_t socket_xp, |
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414 | int32_t status ) |
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415 | { |
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416 | // get socket thread cluster and local pointer |
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417 | socket_t * socket_ptr = GET_PTR( socket_xp ); |
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418 | cxy_t socket_cxy = GET_CXY( socket_xp ); |
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419 | |
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420 | if( status != CMD_STS_SUCCESS ) |
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421 | { |
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422 | uint32_t sock_state = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->state )); |
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423 | uint32_t cmd_type = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->rx_cmd )); |
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424 | pid_t pid = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->pid )); |
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425 | fdid_t fdid = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->fdid )); |
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426 | |
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427 | printk("\n[ERROR] reported by %s : socket[%x,%d] / %s / cmd %s / error %s\n", |
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428 | __FUNCTION__, pid, fdid, socket_state_str(sock_state), |
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429 | socket_cmd_type_str(cmd_type), socket_cmd_sts_str(status) ); |
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430 | } |
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431 | |
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432 | // set rx_sts field in socket descriptor |
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433 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_sts ) , status ); |
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434 | |
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435 | // get extended point on RX client thread |
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436 | xptr_t client_xp = hal_remote_l64( XPTR( socket_cxy , &socket_ptr->rx_client )); |
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437 | |
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438 | // unblock the client thread |
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439 | thread_unblock( client_xp , THREAD_BLOCKED_IO ); |
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440 | |
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441 | } // end dev_nic_unblock_rx_client() |
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442 | |
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443 | |
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444 | |
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445 | /////////////////////////////////////////////////////////////////////////////////////////// |
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446 | // Functions called by the NIC_RX server thread |
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447 | /////////////////////////////////////////////////////////////////////////////////////////// |
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448 | |
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449 | /////////////////////////////////////////////////////////////////////////////////////////// |
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450 | // This static function is called by the dev_nic_rx_server() function. |
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451 | // It analyses an Ethernet frame contained in the kernel buffer defined |
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452 | // by the <buffer> argument, and returns in the <ip_length> argument the length |
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453 | // of the IP packet contained in the Ethernet packet payload. |
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454 | /////////////////////////////////////////////////////////////////////////////////////////// |
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455 | // @ buffer : [in] pointer on a received Ethernet packet |
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456 | // @ ip_length : [out] length of IP packet (in bytes). |
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457 | // @ return 0 if success / return -1 if illegal packet length. |
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458 | /////////////////////////////////////////////////////////////////////////////////////////// |
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459 | static error_t dev_nic_rx_check_eth( uint8_t * buffer, |
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460 | uint32_t * ip_length ) |
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461 | { |
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462 | uint32_t length = ((uint32_t)buffer[12] << 8) | (uint32_t)buffer[13]; |
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463 | |
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464 | *ip_length = length; |
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465 | |
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466 | return 0; |
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467 | } |
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468 | |
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469 | /////////////////////////////////////////////////////////////////////////////////////////// |
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470 | // This static function analyses the IP packet contained in the kernel buffer |
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471 | // defined by the <buffer> argument, and returns in the <ip_src_addr>, <ip_dst_addr>, |
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472 | // <header_length> and <protocol> arguments the informations contained in the IP header. |
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473 | // It checks the IP packet length versus the value contained in Ethernet header. |
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474 | // It checks the IP header checksum. |
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475 | /////////////////////////////////////////////////////////////////////////////////////////// |
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476 | // @ buffer : [in] pointer on the IP packet. |
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477 | // @ expected_length : [in] expected IP packet length (from Ethernet header). |
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478 | // @ ip_src_addr : [out] source IP address. |
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479 | // @ ip_dst_addr : [out] destination IP address. |
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480 | // @ protocol : [out] transport protocol type. |
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481 | // @ return 0 if success / return -1 if illegal packet. |
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482 | /////////////////////////////////////////////////////////////////////////////////////////// |
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483 | static error_t dev_nic_rx_check_ip( uint8_t * buffer, |
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484 | uint32_t expected_length, |
---|
485 | uint32_t * ip_src_addr, |
---|
486 | uint32_t * ip_dst_addr, |
---|
487 | uint32_t * trsp_protocol ) |
---|
488 | { |
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489 | |
---|
490 | #if DEBUG_DEV_NIC_RX |
---|
491 | thread_t * this = CURRENT_THREAD; |
---|
492 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
493 | #endif |
---|
494 | |
---|
495 | // get packet length |
---|
496 | uint32_t length = ((uint32_t)buffer[2] << 8) | (uint32_t)buffer[3]; |
---|
497 | |
---|
498 | // discard packet if eth_payload_length != ip_length |
---|
499 | if( length != expected_length ) |
---|
500 | { |
---|
501 | |
---|
502 | #if DEBUG_DEV_NIC_RX |
---|
503 | if( DEBUG_DEV_NIC_RX < cycle ) |
---|
504 | printk("\n[%s] thread[%x,%x] failure : length (%d) != expected_length (%d)\n", |
---|
505 | __FUNCTION__, this->process->pid, this->trdid, length, expected_length ); |
---|
506 | #endif |
---|
507 | return -1; |
---|
508 | } |
---|
509 | |
---|
510 | // get transport protocol type |
---|
511 | uint8_t protocol = buffer[9]; |
---|
512 | |
---|
513 | // discard packet if unsupported protocol |
---|
514 | if( (protocol != PROTOCOL_TCP) && (protocol != PROTOCOL_UDP) ) |
---|
515 | { |
---|
516 | |
---|
517 | #if DEBUG_DEV_NIC_RX |
---|
518 | if( DEBUG_DEV_NIC_RX < cycle ) |
---|
519 | printk("\n[%s] thread[%x,%x] failure : unsupported transport protocol (%d)\n", |
---|
520 | __FUNCTION__, this->process->pid, this->trdid, protocol ); |
---|
521 | #endif |
---|
522 | return -1; |
---|
523 | |
---|
524 | } |
---|
525 | // compute IP header checksum |
---|
526 | uint32_t computed_cs = (uint32_t)dev_nic_ip_checksum( buffer ); |
---|
527 | |
---|
528 | // extract IP header checksum |
---|
529 | uint32_t received_cs = ((uint32_t)buffer[10] << 8) | ((uint32_t)buffer[11]); |
---|
530 | |
---|
531 | // discard packet if bad checksum |
---|
532 | if( received_cs != computed_cs ) |
---|
533 | { |
---|
534 | |
---|
535 | #if DEBUG_DEV_NIC_RX |
---|
536 | if( DEBUG_DEV_NIC_RX < cycle ) |
---|
537 | printk("\n[%s] thread[%x,%x] failure : computed checksum (%d) != received checksum (%d)\n", |
---|
538 | __FUNCTION__, this->process->pid, this->trdid, computed_cs, received_cs ); |
---|
539 | #endif |
---|
540 | return -1; |
---|
541 | } |
---|
542 | |
---|
543 | |
---|
544 | *ip_src_addr = ((uint32_t)buffer[12] << 24) | |
---|
545 | ((uint32_t)buffer[13] << 16) | |
---|
546 | ((uint32_t)buffer[14] << 8) | |
---|
547 | ((uint32_t)buffer[15] ) ; |
---|
548 | |
---|
549 | *ip_dst_addr = ((uint32_t)buffer[16] << 24) | |
---|
550 | ((uint32_t)buffer[17] << 16) | |
---|
551 | ((uint32_t)buffer[18] << 8) | |
---|
552 | ((uint32_t)buffer[19] ) ; |
---|
553 | |
---|
554 | *trsp_protocol = protocol; |
---|
555 | |
---|
556 | return 0; |
---|
557 | } |
---|
558 | |
---|
559 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
560 | // This static function analyses the UDP packet contained in the kernel buffer |
---|
561 | // defined by the <k_buf> and <k_length> arguments. |
---|
562 | // It checks the UDP checksum, and discard corrupted packets. |
---|
563 | // It scans the list of sockets attached to the NIC_RX chdev to find a matching socket, |
---|
564 | // and discard the received packet if no UDP socket found. |
---|
565 | // Finally, it copies the payload to the socket "rx_buf", as long as the packet payload |
---|
566 | // is not larger than the rx_buf. |
---|
567 | // It set the "rx_valid" flip-flop, and unblock the client thread when the last expected |
---|
568 | // byte has been received. |
---|
569 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
570 | // @ chdev : [in] local pointer on local NIC_RX chdev descriptor. |
---|
571 | // @ k_buf : [in] pointer on the UDP packet in local kernel buffer. |
---|
572 | // @ k_length : [in] number of bytes in buffer (including UDP header). |
---|
573 | // @ pkt_src_addr : [in] source IP address (from IP packet header). |
---|
574 | // @ pkt_dst_addr : [in] destination IP address (from IP packet header). |
---|
575 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
576 | static void dev_nic_rx_handle_udp_packet( chdev_t * chdev, |
---|
577 | uint8_t * k_buf, |
---|
578 | uint32_t k_length, |
---|
579 | uint32_t pkt_src_addr, |
---|
580 | uint32_t pkt_dst_addr ) |
---|
581 | { |
---|
582 | xptr_t root_xp; // extended pointer on attached sockets list root |
---|
583 | xptr_t lock_xp; // extended pointer on chdev lock |
---|
584 | xptr_t iter_xp; // iterator on socket list |
---|
585 | xptr_t socket_xp; // extended pointer on socket descriptor |
---|
586 | cxy_t socket_cxy; |
---|
587 | socket_t * socket_ptr; |
---|
588 | uint32_t socket_type; // socket type |
---|
589 | uint32_t socket_state; // socket state |
---|
590 | uint32_t local_addr; // local IP address from socket |
---|
591 | uint32_t local_port; // local port from socket |
---|
592 | uint32_t remote_addr; // remote IP address from socket |
---|
593 | uint32_t remote_port; // remote port from socket |
---|
594 | bool_t match_socket; // matching socket found |
---|
595 | uint16_t checksum; // computed checksum |
---|
596 | uint16_t pkt_checksum; // received checksum |
---|
597 | xptr_t socket_rbuf_xp; // extended pointer on socket rx_buf |
---|
598 | xptr_t socket_lock_xp; // extended pointer on socket lock |
---|
599 | xptr_t socket_client_xp; // extended pointer on socket rx_client field |
---|
600 | xptr_t client_xp; // extended pointer on client thread descriptor |
---|
601 | uint32_t payload; // number of bytes in payload |
---|
602 | uint32_t status; // number of bytes in rx_buf |
---|
603 | uint32_t space; // number of free slots in rx_buf |
---|
604 | uint32_t moved_bytes; // number of bytes actually moved to rx_buf |
---|
605 | |
---|
606 | // build extended pointers on list of sockets attached to NIC_RX chdev |
---|
607 | root_xp = XPTR( local_cxy , &chdev->wait_root ); |
---|
608 | lock_xp = XPTR( local_cxy , &chdev->wait_lock ); |
---|
609 | |
---|
610 | // compute UDP packet checksum |
---|
611 | checksum = dev_nic_udp_checksum( k_buf , k_length ); |
---|
612 | |
---|
613 | // get checksum from received packet header |
---|
614 | pkt_checksum = ((uint16_t)k_buf[6] << 8) | (uint16_t)k_buf[7]; |
---|
615 | |
---|
616 | // discard corrupted packet |
---|
617 | if( pkt_checksum != checksum ) return; |
---|
618 | |
---|
619 | // get src_port and dst_port from UDP header |
---|
620 | uint32_t pkt_src_port = ((uint32_t)k_buf[0] << 8) | (uint32_t)k_buf[1]; |
---|
621 | uint32_t pkt_dst_port = ((uint32_t)k_buf[2] << 8) | (uint32_t)k_buf[3]; |
---|
622 | |
---|
623 | // discard unexpected packet |
---|
624 | if( xlist_is_empty( root_xp ) ) return; |
---|
625 | |
---|
626 | // take the lock protecting the sockets list |
---|
627 | remote_busylock_acquire( lock_xp ); |
---|
628 | |
---|
629 | match_socket = false; |
---|
630 | |
---|
631 | // scan sockets list to find a match |
---|
632 | XLIST_FOREACH( root_xp , iter_xp ) |
---|
633 | { |
---|
634 | // get socket cluster and local pointer |
---|
635 | socket_xp = XLIST_ELEMENT( iter_xp , socket_t , rx_list ); |
---|
636 | socket_ptr = GET_PTR( socket_xp ); |
---|
637 | socket_cxy = GET_CXY( socket_xp ); |
---|
638 | |
---|
639 | // get socket type |
---|
640 | socket_type = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->type )); |
---|
641 | socket_state = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->state )); |
---|
642 | |
---|
643 | // skip TCP socket |
---|
644 | if( socket_type == SOCK_STREAM ) continue; |
---|
645 | |
---|
646 | // get relevant info from socket descriptor |
---|
647 | local_addr = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->local_addr )); |
---|
648 | remote_addr = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->remote_addr )); |
---|
649 | local_port = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->local_port )); |
---|
650 | remote_port = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->remote_port )); |
---|
651 | |
---|
652 | // compute matching |
---|
653 | bool_t local_match = (local_addr == pkt_dst_addr) && |
---|
654 | (local_port == pkt_dst_port); |
---|
655 | |
---|
656 | bool_t remote_match = (remote_addr == pkt_src_addr) && |
---|
657 | (remote_port == pkt_src_port); |
---|
658 | |
---|
659 | if (socket_state == UDP_STATE_ESTAB ) match_socket = local_match && remote_match; |
---|
660 | else match_socket = local_match; |
---|
661 | |
---|
662 | // exit loop when socket found |
---|
663 | if( match_socket ) break; |
---|
664 | } |
---|
665 | |
---|
666 | // release the lock protecting the sockets list |
---|
667 | remote_busylock_release( lock_xp ); |
---|
668 | |
---|
669 | // discard unexpected packet |
---|
670 | if( match_socket == false ) return; |
---|
671 | |
---|
672 | // build extended pointers on various socket fields |
---|
673 | socket_rbuf_xp = XPTR( socket_cxy , &socket_ptr->rx_buf ); |
---|
674 | socket_lock_xp = XPTR( socket_cxy , &socket_ptr->lock ); |
---|
675 | socket_client_xp = XPTR( socket_cxy , &socket_ptr->rx_client ); |
---|
676 | |
---|
677 | // take the lock protecting the socket |
---|
678 | remote_queuelock_acquire( socket_lock_xp ); |
---|
679 | |
---|
680 | // get status & space from rx_buf |
---|
681 | status = remote_buf_status( socket_rbuf_xp ); |
---|
682 | space = NIC_RX_BUF_SIZE - status; |
---|
683 | |
---|
684 | // get client thread |
---|
685 | client_xp = hal_remote_l64( socket_client_xp ); |
---|
686 | |
---|
687 | // get number of bytes in payload |
---|
688 | payload = k_length - UDP_HEAD_LEN; |
---|
689 | |
---|
690 | // compute number of bytes to move : min (space , seg_payload) |
---|
691 | moved_bytes = ( space < payload ) ? space : payload; |
---|
692 | |
---|
693 | // move payload from kernel buffer to socket rx_buf |
---|
694 | remote_buf_put_from_kernel( socket_rbuf_xp, |
---|
695 | k_buf + UDP_HEAD_LEN, |
---|
696 | moved_bytes ); |
---|
697 | // unblock client thread |
---|
698 | if( client_xp != XPTR_NULL ) |
---|
699 | { |
---|
700 | thread_unblock( client_xp , THREAD_BLOCKED_IO ); |
---|
701 | } |
---|
702 | |
---|
703 | // release the lock protecting the socket |
---|
704 | remote_queuelock_release( socket_lock_xp ); |
---|
705 | |
---|
706 | } // end dev_nic_rx_handle_udp_packet() |
---|
707 | |
---|
708 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
709 | // This static function is called by the dev_nic_rx_server() function to handle one RX |
---|
710 | // TCP segment contained in a kernel buffer defined by the <k_buf> & <k_length> arguments. |
---|
711 | // The <seg_remote_addr> and <seg_local_addr> arguments are obtained from the received |
---|
712 | // IP packet header. It the received segment doesn't match any connected socket attached |
---|
713 | // to the selected chdev[k], or any listening socket waiting connection, or if the segment |
---|
714 | // is corrupted, this segment is discarded. |
---|
715 | // If required by the TCP flags, it registers an R2T request in the socket R2T queue |
---|
716 | // to implement the TCP handcheck for close and connect. |
---|
717 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
718 | // Implementation note: |
---|
719 | // A "connected" socket is actually a TCP socket already attached to a given NIC_RX[k] |
---|
720 | // chdev, and can therefore receive a TCP segment on the NIC channel <k>. A "listening" |
---|
721 | // socket is a TCP socket in the LISTEN state. This function operates in 6 steps: |
---|
722 | // 1) It checks the TCP checksum, and discard the corrupted segment if corrupted. |
---|
723 | // 2) It scans the list of sockets attached to the NIC_RX[k] chdev, to find one TCP |
---|
724 | // socket matching the TCP segment header. |
---|
725 | // 3) When a matching connected socket is found, it handles the received segment, including |
---|
726 | // the SYN, FIN, ACK and RST flags. It updates the socket state when required, moves |
---|
727 | // data to the rx_buf when possible, and return. It takes the lock protecting the socket, |
---|
728 | // because an connected socket is accessed by both the NIC_TX and NIC_RX server threads. |
---|
729 | // 4) If no matching connected socket has been found, it scans the list of listening |
---|
730 | // sockets to find a matching listening socket. |
---|
731 | // 5) When a matching listening socket is found, it simply registers a new connection |
---|
732 | // request in the listening socket CRQ queue, when the SYN flag is set, and insert |
---|
733 | // a SYN-ACK request in the socket R2T queue. |
---|
734 | // 6) It discards the packet if no connected or listening socket has been found. |
---|
735 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
736 | // @ chdev : [in] local pointer on local NIC_RX chdev descriptor. |
---|
737 | // @ k_buf : [in] pointer on the TCP packet in local kernel buffer. |
---|
738 | // @ k_length : [in] number of bytes in buffer (including TCP header). |
---|
739 | // @ seg_remote_addr : [in] remote IP address (from IP packet header). |
---|
740 | // @ seg_local_addr : [in] local IP address (from IP packet header). |
---|
741 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
742 | static void dev_nic_rx_handle_tcp_segment( chdev_t * chdev, |
---|
743 | uint8_t * k_buf, |
---|
744 | uint32_t k_length, |
---|
745 | uint32_t seg_remote_addr, |
---|
746 | uint32_t seg_local_addr ) |
---|
747 | { |
---|
748 | xptr_t root_xp; // extended pointer on connected sockets list root |
---|
749 | xptr_t lock_xp; // extended pointer on chdev lock |
---|
750 | xptr_t iter_xp; // iterator for these queues |
---|
751 | bool_t attached_match; // true if one attached socket match |
---|
752 | bool_t listening_match; // true if one listening socket match |
---|
753 | xptr_t socket_xp; // extended pointer on matching socket |
---|
754 | cxy_t socket_cxy; // cluster identifier of matching socket |
---|
755 | socket_t * socket_ptr; // local pointer on matching socket |
---|
756 | uint32_t socket_local_addr; // local IP address from socket |
---|
757 | uint32_t socket_local_port; // local port from socket |
---|
758 | uint32_t socket_remote_addr; // remote IP address from socket |
---|
759 | uint32_t socket_remote_port; // remote port from socket |
---|
760 | uint32_t socket_state; // socket state |
---|
761 | uint32_t socket_type; // socket type |
---|
762 | bool_t socket_tx_valid; // TX command valid |
---|
763 | uint32_t socket_tx_cmd; // TX command type |
---|
764 | uint32_t socket_tx_todo; // number of TX bytes not sent yet |
---|
765 | uint32_t socket_tx_nxt; // next byte to send in TX stream |
---|
766 | uint32_t socket_tx_una; // first unacknowledged byte in TX stream |
---|
767 | bool_t socket_rx_valid; // RX command valid |
---|
768 | uint32_t socket_rx_cmd; // TX command type |
---|
769 | uint32_t socket_rx_nxt; // next expected byte in RX stream |
---|
770 | uint32_t socket_rx_wnd; // current window value in RX stream |
---|
771 | uint32_t socket_rx_irs; // initial sequence index in RX stream |
---|
772 | xptr_t socket_lock_xp; // extended pointer on lock protecting socket state |
---|
773 | xptr_t socket_rx_buf_xp; // extended pointer on socket rx_buf |
---|
774 | xptr_t socket_r2tq_xp; // extended pointer on socket R2T queue |
---|
775 | xptr_t socket_crqq_xp; // extended pointer on socket CRQ queue |
---|
776 | uint16_t checksum; // computed TCP segment chechsum |
---|
777 | error_t error; |
---|
778 | |
---|
779 | // get relevant infos from TCP segment header |
---|
780 | uint32_t seg_remote_port = ((uint32_t)k_buf[0] << 8) | (uint32_t)k_buf[1]; |
---|
781 | uint32_t seg_local_port = ((uint32_t)k_buf[2] << 8) | (uint32_t)k_buf[3]; |
---|
782 | |
---|
783 | uint32_t seg_seq_num = ((uint32_t)k_buf[4] << 24) | |
---|
784 | ((uint32_t)k_buf[5] << 16) | |
---|
785 | ((uint32_t)k_buf[6] << 8) | |
---|
786 | ((uint32_t)k_buf[7] ); |
---|
787 | |
---|
788 | uint32_t seg_ack_num = ((uint32_t)k_buf[8] << 24) | |
---|
789 | ((uint32_t)k_buf[9] << 16) | |
---|
790 | ((uint32_t)k_buf[10] << 8) | |
---|
791 | ((uint32_t)k_buf[11] ); |
---|
792 | |
---|
793 | uint8_t seg_hlen = k_buf[12] << 2; // TCP header length in bytes |
---|
794 | |
---|
795 | uint8_t seg_flags = k_buf[13]; |
---|
796 | |
---|
797 | bool_t seg_ack_set = ((seg_flags & TCP_FLAG_ACK) != 0); |
---|
798 | bool_t seg_syn_set = ((seg_flags & TCP_FLAG_SYN) != 0); |
---|
799 | bool_t seg_fin_set = ((seg_flags & TCP_FLAG_FIN) != 0); |
---|
800 | bool_t seg_rst_set = ((seg_flags & TCP_FLAG_RST) != 0); |
---|
801 | |
---|
802 | uint16_t seg_window = ((uint32_t)k_buf[14] << 8) | (uint32_t)k_buf[15]; |
---|
803 | |
---|
804 | uint16_t seg_checksum = ((uint32_t)k_buf[16] << 8) | (uint32_t)k_buf[17]; |
---|
805 | |
---|
806 | uint32_t seg_data_len = k_length - seg_hlen; // number of bytes in payload |
---|
807 | |
---|
808 | #if DEBUG_DEV_NIC_RX |
---|
809 | thread_t * this = CURRENT_THREAD; |
---|
810 | uint32_t cycle; |
---|
811 | uint32_t fdid; |
---|
812 | pid_t pid; |
---|
813 | #endif |
---|
814 | |
---|
815 | #if DEBUG_DEV_NIC_RX |
---|
816 | cycle = (uint32_t)hal_get_cycles(); |
---|
817 | if( cycle > DEBUG_DEV_NIC_RX ) |
---|
818 | printk("\n[%s] thread[%x,%x] enters / tcp_length %d / tcp_flags %x / cycle %d\n", |
---|
819 | __FUNCTION__, this->process->pid, this->trdid, k_length, seg_flags , cycle ); |
---|
820 | #endif |
---|
821 | |
---|
822 | // compute and check TCP checksum |
---|
823 | k_buf[16] = 0; |
---|
824 | k_buf[17] = 0; |
---|
825 | checksum = dev_nic_tcp_checksum( k_buf, |
---|
826 | k_length, |
---|
827 | seg_remote_addr, |
---|
828 | seg_local_addr ); |
---|
829 | |
---|
830 | // discard segment if corrupted |
---|
831 | if( seg_checksum != checksum ) |
---|
832 | { |
---|
833 | |
---|
834 | #if DEBUG_DEV_NIC_RX |
---|
835 | if( cycle > DEBUG_DEV_NIC_RX ) |
---|
836 | printk("\n[%s] thread[%x,%x] tcp checksum failure : received %x / computed %x\n", |
---|
837 | __FUNCTION__, this->process->pid, this->trdid, seg_checksum, checksum ); |
---|
838 | #endif |
---|
839 | return; |
---|
840 | } |
---|
841 | |
---|
842 | // scan list of attached sockets to find a matching TCP socket |
---|
843 | attached_match = false; |
---|
844 | |
---|
845 | // build extended pointer on xlist of sockets attached to NIC_RX chdev |
---|
846 | root_xp = XPTR( local_cxy , &chdev->wait_root ); |
---|
847 | lock_xp = XPTR( local_cxy , &chdev->wait_lock ); |
---|
848 | |
---|
849 | // take the lock protecting the list of attached sockets |
---|
850 | remote_busylock_acquire( lock_xp ); |
---|
851 | |
---|
852 | XLIST_FOREACH( root_xp , iter_xp ) |
---|
853 | { |
---|
854 | // get socket cluster and local pointer |
---|
855 | socket_xp = XLIST_ELEMENT( iter_xp , socket_t , rx_list ); |
---|
856 | socket_ptr = GET_PTR( socket_xp ); |
---|
857 | socket_cxy = GET_CXY( socket_xp ); |
---|
858 | |
---|
859 | // get socket type and state |
---|
860 | socket_type = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->type )); |
---|
861 | socket_state = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->state )); |
---|
862 | |
---|
863 | // skip UDP socket |
---|
864 | if( socket_type == SOCK_DGRAM ) continue; |
---|
865 | |
---|
866 | // get relevant socket infos for matching |
---|
867 | socket_local_addr = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->local_addr )); |
---|
868 | socket_remote_addr = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->remote_addr )); |
---|
869 | socket_local_port = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->local_port )); |
---|
870 | socket_remote_port = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->remote_port )); |
---|
871 | |
---|
872 | // compute matching condition for a connected socket |
---|
873 | attached_match = (socket_local_addr == seg_local_addr) && |
---|
874 | (socket_local_port == seg_local_port) && |
---|
875 | (socket_remote_addr == seg_remote_addr) && |
---|
876 | (socket_remote_port == seg_remote_port) ; |
---|
877 | |
---|
878 | // exit loop if matching |
---|
879 | if( attached_match ) |
---|
880 | { |
---|
881 | |
---|
882 | #if DEBUG_DEV_NIC_RX |
---|
883 | fdid = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->fdid ) ); |
---|
884 | pid = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->pid ) ); |
---|
885 | if( cycle > DEBUG_DEV_NIC_RX ) |
---|
886 | printk("\n[%s] thread[%x,%x] matching attached socket[%d,%d] / state %s\n", |
---|
887 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, socket_state_str(socket_state) ); |
---|
888 | #endif |
---|
889 | break; |
---|
890 | } |
---|
891 | |
---|
892 | } // end loop on attached sockets |
---|
893 | |
---|
894 | // release the lock protecting the list of attached sockets |
---|
895 | remote_busylock_release( lock_xp ); |
---|
896 | |
---|
897 | // handle TCP segment for an attached socket |
---|
898 | if( attached_match ) |
---|
899 | { |
---|
900 | // The actions depend on both the socket state and the received segment flags : |
---|
901 | // - update socket state, |
---|
902 | // - move data to rx_buf, |
---|
903 | // - register a request in R2T queue when required |
---|
904 | |
---|
905 | // build extended pointers on various socket fields |
---|
906 | socket_lock_xp = XPTR( socket_cxy , &socket_ptr->lock ); |
---|
907 | socket_rx_buf_xp = XPTR( socket_cxy , &socket_ptr->rx_buf ); |
---|
908 | socket_r2tq_xp = XPTR( socket_cxy , &socket_ptr->r2tq ); |
---|
909 | |
---|
910 | // take the lock protecting the matching socket |
---|
911 | remote_queuelock_acquire( socket_lock_xp ); |
---|
912 | |
---|
913 | // get relevant socket infos from socket descriptor |
---|
914 | socket_tx_valid = hal_remote_l32(XPTR( socket_cxy , &socket_ptr->tx_valid )); |
---|
915 | socket_tx_cmd = hal_remote_l32(XPTR( socket_cxy , &socket_ptr->tx_cmd )); |
---|
916 | socket_tx_todo = hal_remote_l32(XPTR( socket_cxy , &socket_ptr->tx_todo )); |
---|
917 | socket_tx_nxt = hal_remote_l32(XPTR( socket_cxy , &socket_ptr->tx_nxt )); |
---|
918 | socket_tx_una = hal_remote_l32(XPTR( socket_cxy , &socket_ptr->tx_una )); |
---|
919 | |
---|
920 | socket_rx_valid = hal_remote_l32(XPTR( socket_cxy , &socket_ptr->rx_valid )); |
---|
921 | socket_rx_cmd = hal_remote_l32(XPTR( socket_cxy , &socket_ptr->rx_cmd )); |
---|
922 | socket_rx_nxt = hal_remote_l32(XPTR( socket_cxy , &socket_ptr->rx_nxt )); |
---|
923 | socket_rx_wnd = hal_remote_l32(XPTR( socket_cxy , &socket_ptr->rx_wnd )); |
---|
924 | socket_rx_irs = hal_remote_l32(XPTR( socket_cxy , &socket_ptr->rx_irs )); |
---|
925 | |
---|
926 | // handle the received segment, depending on the matching socket state |
---|
927 | switch( socket_state ) |
---|
928 | { |
---|
929 | //////////////////////// |
---|
930 | case TCP_STATE_SYN_SENT: // TCP client waiting for SYN-ACK in connect handshake |
---|
931 | { |
---|
932 | // [1] check ACK flag |
---|
933 | if( seg_ack_set ) |
---|
934 | { |
---|
935 | if( seg_ack_num != TCP_ISS_CLIENT + 1 ) // bad ACK => report error |
---|
936 | { |
---|
937 | |
---|
938 | #if DEBUG_DEV_NIC_RX |
---|
939 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : expect ack_num %x / get %x\n", |
---|
940 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
941 | socket_state_str(socket_state), TCP_ISS_CLIENT + 1, seg_ack_num ); |
---|
942 | #endif |
---|
943 | // make an RST request to R2T queue |
---|
944 | socket_put_r2t_request( socket_r2tq_xp, |
---|
945 | TCP_FLAG_RST, |
---|
946 | chdev->channel ); |
---|
947 | |
---|
948 | // report error to local TX client thread |
---|
949 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_BADACK ); |
---|
950 | |
---|
951 | break; |
---|
952 | } |
---|
953 | } |
---|
954 | |
---|
955 | // [2] check RST flag // receive RST => report error |
---|
956 | if( seg_rst_set ) |
---|
957 | { |
---|
958 | |
---|
959 | #if DEBUG_DEV_NIC_RX |
---|
960 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : received RST flag\n", |
---|
961 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, socket_state_str(socket_state) ); |
---|
962 | #endif |
---|
963 | // update socket state |
---|
964 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
965 | TCP_STATE_BOUND ); |
---|
966 | |
---|
967 | // signal error to local TX client thread |
---|
968 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_RST ); |
---|
969 | |
---|
970 | break; |
---|
971 | } |
---|
972 | |
---|
973 | // [3] handle security & precedence TODO ... someday |
---|
974 | |
---|
975 | // [4] handle SYN-ACK |
---|
976 | if( seg_syn_set && seg_ack_set ) // received SYN and ACK => report success |
---|
977 | { |
---|
978 | |
---|
979 | #if DEBUG_DEV_NIC_RX |
---|
980 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : received expected SYN-ACK\n", |
---|
981 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid , socket_state_str(socket_state) ); |
---|
982 | #endif |
---|
983 | // set socket.tx_una |
---|
984 | hal_remote_s32( XPTR(socket_cxy , &socket_ptr->tx_una), seg_ack_num ); |
---|
985 | |
---|
986 | // set socket.rx_irs |
---|
987 | hal_remote_s32( XPTR(socket_cxy , &socket_ptr->rx_irs), seg_seq_num ); |
---|
988 | |
---|
989 | // set socket.rx_nxt |
---|
990 | hal_remote_s32( XPTR(socket_cxy , &socket_ptr->rx_nxt), seg_seq_num + 1 ); |
---|
991 | |
---|
992 | // update socket.state |
---|
993 | hal_remote_s32( XPTR(socket_cxy , &socket_ptr->state), TCP_STATE_ESTAB ); |
---|
994 | |
---|
995 | // make an ACK request to R2T queue |
---|
996 | socket_put_r2t_request( socket_r2tq_xp, |
---|
997 | TCP_FLAG_ACK, |
---|
998 | chdev->channel ); |
---|
999 | |
---|
1000 | // report succes to local TX client thread |
---|
1001 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_SUCCESS ); |
---|
1002 | } |
---|
1003 | else // received SYN without ACK => client becomes server |
---|
1004 | { |
---|
1005 | |
---|
1006 | #if DEBUG_DEV_NIC_RX |
---|
1007 | printk("\n[%s] thread[%x,%x] for socket[%x,%d] %s : received SYN-ACK => become server\n", |
---|
1008 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid , socket_state_str(socket_state) ); |
---|
1009 | #endif |
---|
1010 | // update socket.state |
---|
1011 | hal_remote_s32( XPTR(socket_cxy,&socket_ptr->state), TCP_STATE_SYN_RCVD ); |
---|
1012 | |
---|
1013 | // set socket.tx_nxt |
---|
1014 | hal_remote_s32( XPTR(socket_cxy , &socket_ptr->tx_nxt), TCP_ISS_SERVER ); |
---|
1015 | |
---|
1016 | // set socket.rx_nxt to seg_seq_num + 1 |
---|
1017 | hal_remote_s32( XPTR(socket_cxy,&socket_ptr->rx_nxt), seg_seq_num + 1 ); |
---|
1018 | |
---|
1019 | // make a SYN.ACK request to R2T queue |
---|
1020 | socket_put_r2t_request( socket_r2tq_xp, |
---|
1021 | TCP_FLAG_SYN | TCP_FLAG_ACK, |
---|
1022 | chdev->channel ); |
---|
1023 | } |
---|
1024 | break; |
---|
1025 | } |
---|
1026 | //////////////////////// |
---|
1027 | case TCP_STATE_SYN_RCVD: // TCP server waiting last ACK in connect handshake |
---|
1028 | { |
---|
1029 | // [1] check sequence number |
---|
1030 | if( seg_seq_num != socket_rx_nxt ) // unexpected SEQ_NUM => discard |
---|
1031 | { |
---|
1032 | |
---|
1033 | #if DEBUG_DEV_NIC_RX |
---|
1034 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : expect seq_num %x / get %x\n", |
---|
1035 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
1036 | socket_state_str(socket_state), socket_rx_nxt, seg_seq_num ); |
---|
1037 | #endif |
---|
1038 | // discard segment without reporting |
---|
1039 | break; |
---|
1040 | } |
---|
1041 | |
---|
1042 | // [2] handle RST flag // received RST => report error |
---|
1043 | if( seg_rst_set ) |
---|
1044 | { |
---|
1045 | |
---|
1046 | #if DEBUG_DEV_NIC_RX |
---|
1047 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : received RST flag\n", |
---|
1048 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid , socket_state_str(socket_state) ); |
---|
1049 | #endif |
---|
1050 | // update socket state |
---|
1051 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), TCP_STATE_BOUND ); |
---|
1052 | |
---|
1053 | // report error to local TX client thread |
---|
1054 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_RST ); |
---|
1055 | |
---|
1056 | break; |
---|
1057 | } |
---|
1058 | |
---|
1059 | // [3] handle security & precedence TODO ... someday |
---|
1060 | |
---|
1061 | // [4] handle SYN flag |
---|
1062 | if( seg_syn_set ) // received SYN => discard |
---|
1063 | { |
---|
1064 | |
---|
1065 | #if DEBUG_DEV_NIC_RX |
---|
1066 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : received SYN flag\n", |
---|
1067 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid , socket_state_str(socket_state) ); |
---|
1068 | #endif |
---|
1069 | // discard segment without reporting |
---|
1070 | break; |
---|
1071 | } |
---|
1072 | |
---|
1073 | // [5] handle ACK flag |
---|
1074 | if( seg_ack_set == false ) // missing ACK => discard |
---|
1075 | { |
---|
1076 | |
---|
1077 | #if DEBUG_DEV_NIC_RX |
---|
1078 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : no ACK in TCP segment\n", |
---|
1079 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid , socket_state_str(socket_state) ); |
---|
1080 | #endif |
---|
1081 | // discard segment without reporting |
---|
1082 | break; |
---|
1083 | } |
---|
1084 | else if( seg_ack_num != (TCP_ISS_SERVER + 1) ) // unacceptable ACK |
---|
1085 | { |
---|
1086 | |
---|
1087 | #if DEBUG_DEV_NIC_RX |
---|
1088 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : expect ack_num %x / get %x\n", |
---|
1089 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
1090 | socket_state_str(socket_state), TCP_ISS_SERVER + 1, seg_ack_num ); |
---|
1091 | #endif |
---|
1092 | |
---|
1093 | // register an RST request to R2TQ for remote TCP client |
---|
1094 | socket_put_r2t_request( socket_r2tq_xp, |
---|
1095 | TCP_FLAG_RST, |
---|
1096 | chdev->channel ); |
---|
1097 | |
---|
1098 | // report error to local TX client thread |
---|
1099 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_BADACK ); |
---|
1100 | } |
---|
1101 | else // acceptable ACK |
---|
1102 | { |
---|
1103 | |
---|
1104 | #if DEBUG_DEV_NIC_RX |
---|
1105 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : received expected ACK\n", |
---|
1106 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid , socket_state_str(socket_state) ); |
---|
1107 | #endif |
---|
1108 | // set socket.tx_una |
---|
1109 | hal_remote_s32( XPTR(socket_cxy , &socket_ptr->tx_una), seg_ack_num ); |
---|
1110 | |
---|
1111 | // update socket.state |
---|
1112 | hal_remote_s32( XPTR(socket_cxy , &socket_ptr->state), |
---|
1113 | TCP_STATE_ESTAB ); |
---|
1114 | |
---|
1115 | // report success to local TX client thread |
---|
1116 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_SUCCESS ); |
---|
1117 | } |
---|
1118 | break; |
---|
1119 | } |
---|
1120 | ///////////////////// |
---|
1121 | case TCP_STATE_ESTAB: |
---|
1122 | case TCP_STATE_FIN_WAIT1: |
---|
1123 | case TCP_STATE_FIN_WAIT2: |
---|
1124 | case TCP_STATE_CLOSE_WAIT: |
---|
1125 | case TCP_STATE_CLOSING: |
---|
1126 | case TCP_STATE_LAST_ACK: |
---|
1127 | case TCP_STATE_TIME_WAIT: |
---|
1128 | { |
---|
1129 | // [1] check sequence number : out_of_order segments not accepted |
---|
1130 | if( seg_seq_num != socket_rx_nxt ) |
---|
1131 | { |
---|
1132 | |
---|
1133 | #if DEBUG_DEV_NIC_RX |
---|
1134 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : illegal SEQ_NUM %x / expected %x\n", |
---|
1135 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
1136 | socket_state_str(socket_state), seg_seq_num, socket_rx_nxt ); |
---|
1137 | #endif |
---|
1138 | // discard segment |
---|
1139 | break; |
---|
1140 | } |
---|
1141 | |
---|
1142 | // check all bytes in window when the payload exist |
---|
1143 | // TODO : we could accept bytes that are in window, |
---|
1144 | // but this implementation reject all bytes in segment |
---|
1145 | if( seg_data_len > 0 ) |
---|
1146 | { |
---|
1147 | // compute min & max acceptable sequence numbers |
---|
1148 | uint32_t seq_min = socket_rx_nxt; |
---|
1149 | uint32_t seq_max = socket_rx_nxt + socket_rx_wnd - 1; |
---|
1150 | |
---|
1151 | // compute sequence number for last byte in segment |
---|
1152 | uint32_t seg_seq_last = seg_seq_num + seg_data_len - 1; |
---|
1153 | |
---|
1154 | if( is_in_window( seg_seq_last, seq_min, seq_max ) == false ) |
---|
1155 | { |
---|
1156 | |
---|
1157 | #if DEBUG_DEV_NIC_RX |
---|
1158 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : last SEQ_NUM %x not in [%x,%x]\n", |
---|
1159 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
1160 | socket_state_str(socket_state), seg_seq_last, seq_min, seq_max ); |
---|
1161 | #endif |
---|
1162 | // discard segment |
---|
1163 | break; |
---|
1164 | } |
---|
1165 | } |
---|
1166 | |
---|
1167 | // [2] handle RST flag |
---|
1168 | if( seg_rst_set ) |
---|
1169 | { |
---|
1170 | |
---|
1171 | #if DEBUG_DEV_NIC_RX |
---|
1172 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : received RST flag\n", |
---|
1173 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, socket_state_str(socket_state) ); |
---|
1174 | #endif |
---|
1175 | if( (socket_state == TCP_STATE_ESTAB ) || |
---|
1176 | (socket_state == TCP_STATE_FIN_WAIT1 ) || |
---|
1177 | (socket_state == TCP_STATE_FIN_WAIT2 ) || |
---|
1178 | (socket_state == TCP_STATE_CLOSE_WAIT) ) |
---|
1179 | { |
---|
1180 | // TODO all pending send & received commands |
---|
1181 | // must receive "reset" responses |
---|
1182 | |
---|
1183 | // TODO destroy the socket |
---|
1184 | } |
---|
1185 | else // states CLOSING / LAST_ACK / TIME_WAIT |
---|
1186 | { |
---|
1187 | // TODO |
---|
1188 | } |
---|
1189 | break; |
---|
1190 | } |
---|
1191 | |
---|
1192 | // [3] handle security & precedence TODO ... someday |
---|
1193 | |
---|
1194 | // [4] check SYN flag |
---|
1195 | if( seg_syn_set ) // received SYN => ERROR |
---|
1196 | { |
---|
1197 | |
---|
1198 | #if DEBUG_DEV_NIC_RX |
---|
1199 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : received unexpected SYN\n", |
---|
1200 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid , socket_state_str(socket_state) ); |
---|
1201 | #endif |
---|
1202 | // TODO signal error to user |
---|
1203 | |
---|
1204 | // make an RST request to R2T queue |
---|
1205 | socket_put_r2t_request( socket_r2tq_xp, |
---|
1206 | TCP_FLAG_RST, |
---|
1207 | chdev->channel ); |
---|
1208 | |
---|
1209 | // update socket state |
---|
1210 | hal_remote_s32( XPTR(socket_cxy , &socket_ptr->state), TCP_STATE_BOUND ); |
---|
1211 | |
---|
1212 | break; |
---|
1213 | } |
---|
1214 | |
---|
1215 | // [5] check ACK |
---|
1216 | if( seg_ack_set == false ) // missing ACK |
---|
1217 | { |
---|
1218 | |
---|
1219 | #if DEBUG_DEV_NIC_RX |
---|
1220 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : no ACK flag\n", |
---|
1221 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, socket_state_str(socket_state) ); |
---|
1222 | #endif |
---|
1223 | // discard segment |
---|
1224 | break; |
---|
1225 | } |
---|
1226 | else if( is_in_window( seg_ack_num, |
---|
1227 | socket_tx_una, |
---|
1228 | socket_tx_nxt ) == false ) // unacceptable ACK |
---|
1229 | { |
---|
1230 | |
---|
1231 | #if DEBUG_DEV_NIC_RX |
---|
1232 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : ACK_NUM %x not in [%x,%x]\n", |
---|
1233 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, socket_state_str(socket_state), |
---|
1234 | seg_ack_num, socket_tx_una, socket_tx_nxt ); |
---|
1235 | #endif |
---|
1236 | // discard segment |
---|
1237 | break; |
---|
1238 | } |
---|
1239 | else // acceptable ack |
---|
1240 | { |
---|
1241 | // update socket.tx_una |
---|
1242 | hal_remote_s32( XPTR(socket_cxy , &socket_ptr->tx_una), seg_ack_num ); |
---|
1243 | |
---|
1244 | // update socket.tx_wnd |
---|
1245 | hal_remote_s32( XPTR(socket_cxy , &socket_ptr->tx_wnd), seg_window ); |
---|
1246 | |
---|
1247 | // check last data byte acknowledged for a SEND command |
---|
1248 | if( (socket_tx_todo == 0) && |
---|
1249 | (seg_ack_num == socket_tx_nxt) && |
---|
1250 | (socket_tx_cmd == CMD_TX_SEND) ) |
---|
1251 | { |
---|
1252 | // signal success to TX client thread |
---|
1253 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_SUCCESS ); |
---|
1254 | } |
---|
1255 | } |
---|
1256 | |
---|
1257 | // [7] handle URG flag TODO ... someday |
---|
1258 | |
---|
1259 | // [8] Move DATA to rx_buf / ACK request to R2T queue / unblock rx_client |
---|
1260 | if( seg_data_len ) |
---|
1261 | { |
---|
1262 | if( (socket_state == TCP_STATE_ESTAB) || |
---|
1263 | (socket_state == TCP_STATE_FIN_WAIT1) || |
---|
1264 | (socket_state == TCP_STATE_FIN_WAIT2) ) |
---|
1265 | { |
---|
1266 | // get number of bytes already stored in rx_buf |
---|
1267 | uint32_t status = remote_buf_status( socket_rx_buf_xp ); |
---|
1268 | |
---|
1269 | // compute empty space in rx_buf |
---|
1270 | uint32_t space = NIC_RX_BUF_SIZE - status; |
---|
1271 | |
---|
1272 | // compute number of bytes to move : min (space , seg_data_len) |
---|
1273 | uint32_t nbytes = ( space < seg_data_len ) ? space : seg_data_len; |
---|
1274 | |
---|
1275 | // move payload from k_buf to rx_buf |
---|
1276 | remote_buf_put_from_kernel( socket_rx_buf_xp, |
---|
1277 | k_buf + seg_hlen, |
---|
1278 | nbytes ); |
---|
1279 | #if DEBUG_DEV_NIC_RX |
---|
1280 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : move %d bytes to rx_buf\n", |
---|
1281 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
1282 | socket_state_str(socket_state), nbytes ); |
---|
1283 | #endif |
---|
1284 | // update socket.rx_nxt |
---|
1285 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_nxt ), |
---|
1286 | socket_rx_nxt + nbytes ); |
---|
1287 | |
---|
1288 | // update socket.rx_wnd |
---|
1289 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_wnd ), |
---|
1290 | socket_rx_wnd - nbytes ); |
---|
1291 | |
---|
1292 | // make an ACK request to R2T queue |
---|
1293 | socket_put_r2t_request( socket_r2tq_xp, |
---|
1294 | TCP_FLAG_ACK, |
---|
1295 | chdev->channel ); |
---|
1296 | |
---|
1297 | // check pending RX_RECV command |
---|
1298 | if( (socket_rx_valid == true) && |
---|
1299 | (socket_rx_cmd == CMD_RX_RECV) ) |
---|
1300 | { |
---|
1301 | // reset rx_valid |
---|
1302 | hal_remote_s32( XPTR(socket_cxy,&socket_ptr->rx_valid), false ); |
---|
1303 | |
---|
1304 | // report success to RX client thread |
---|
1305 | dev_nic_unblock_rx_client( socket_xp , CMD_STS_SUCCESS ); |
---|
1306 | #if DEBUG_DEV_NIC_RX |
---|
1307 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : unblock waiting RX client thread\n", |
---|
1308 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
1309 | socket_state_str(socket_state) ); |
---|
1310 | #endif |
---|
1311 | } |
---|
1312 | } |
---|
1313 | } |
---|
1314 | |
---|
1315 | // [9] handle FIN flag |
---|
1316 | if( socket_state == TCP_STATE_ESTAB ) |
---|
1317 | { |
---|
1318 | if( seg_fin_set ) // received ACK & FIN |
---|
1319 | { |
---|
1320 | |
---|
1321 | #if DEBUG_DEV_NIC_RX |
---|
1322 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : FIN-ACK => goes CLOSE_WAIT\n", |
---|
1323 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
1324 | socket_state_str(socket_state) ); |
---|
1325 | #endif |
---|
1326 | // update socket.rx_nxt when FIN received |
---|
1327 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_nxt ), |
---|
1328 | socket_rx_nxt + 1 ); |
---|
1329 | |
---|
1330 | // update socket state |
---|
1331 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
1332 | TCP_STATE_CLOSE_WAIT ); |
---|
1333 | |
---|
1334 | // make an ACK request to R2T queue |
---|
1335 | socket_put_r2t_request( socket_r2tq_xp, |
---|
1336 | TCP_FLAG_ACK, |
---|
1337 | chdev->channel ); |
---|
1338 | |
---|
1339 | // check pending RX_RECV command |
---|
1340 | if( (socket_rx_valid == true) && |
---|
1341 | (socket_rx_cmd == CMD_RX_RECV) ) |
---|
1342 | { |
---|
1343 | // reset rx_valid |
---|
1344 | hal_remote_s32( XPTR(socket_cxy,&socket_ptr->rx_valid), false ); |
---|
1345 | |
---|
1346 | // report error to RX client thread |
---|
1347 | dev_nic_unblock_rx_client( socket_xp , CMD_STS_EOF ); |
---|
1348 | #if DEBUG_DEV_NIC_RX |
---|
1349 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : unblock RX client waiting on RECV\n", |
---|
1350 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
1351 | socket_state_str(socket_state) ); |
---|
1352 | #endif |
---|
1353 | } |
---|
1354 | } |
---|
1355 | } |
---|
1356 | else if( socket_state == TCP_STATE_FIN_WAIT1 ) |
---|
1357 | { |
---|
1358 | if( seg_fin_set ) // received ACK & FIN |
---|
1359 | { |
---|
1360 | |
---|
1361 | #if DEBUG_DEV_NIC_RX |
---|
1362 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : FIN-ACK => goes CLOSING\n", |
---|
1363 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
1364 | socket_state_str(socket_state) ); |
---|
1365 | #endif |
---|
1366 | // update socket.rx_nxt when FIN received |
---|
1367 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_nxt ), |
---|
1368 | socket_rx_nxt + 1 ); |
---|
1369 | |
---|
1370 | // update socket state |
---|
1371 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
1372 | TCP_STATE_CLOSING ); |
---|
1373 | |
---|
1374 | // make an ACK request to R2T queue |
---|
1375 | socket_put_r2t_request( socket_r2tq_xp, |
---|
1376 | TCP_FLAG_ACK, |
---|
1377 | chdev->channel ); |
---|
1378 | } |
---|
1379 | else // received ACK only |
---|
1380 | { |
---|
1381 | |
---|
1382 | #if DEBUG_DEV_NIC_RX |
---|
1383 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : only ACK => goes FIN_WAIT2\n", |
---|
1384 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
1385 | socket_state_str(socket_state) ); |
---|
1386 | #endif |
---|
1387 | // update socket state |
---|
1388 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
1389 | TCP_STATE_FIN_WAIT2 ); |
---|
1390 | } |
---|
1391 | } |
---|
1392 | else if( socket_state == TCP_STATE_FIN_WAIT2 ) |
---|
1393 | { |
---|
1394 | if( seg_fin_set ) // received ACK & FIN |
---|
1395 | { |
---|
1396 | |
---|
1397 | #if DEBUG_DEV_NIC_RX |
---|
1398 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s : FIN-ACK => goes CLOSED / unblock client\n", |
---|
1399 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
1400 | socket_state_str(socket_state) ); |
---|
1401 | #endif |
---|
1402 | // update socket.rx_nxt when FIN received |
---|
1403 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_nxt ), |
---|
1404 | socket_rx_nxt + 1 ); |
---|
1405 | |
---|
1406 | // update socket.state |
---|
1407 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
1408 | TCP_STATE_CLOSED ); // TODO change to TIME_WAIT |
---|
1409 | |
---|
1410 | // make an ACK request to R2T queue |
---|
1411 | socket_put_r2t_request( socket_r2tq_xp, |
---|
1412 | TCP_FLAG_ACK, |
---|
1413 | chdev->channel ); |
---|
1414 | |
---|
1415 | // report success to TX client thread |
---|
1416 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_SUCCESS ); |
---|
1417 | |
---|
1418 | // TODO start the MSL timer / turn off others timers |
---|
1419 | |
---|
1420 | } |
---|
1421 | } |
---|
1422 | else if( socket_state == TCP_STATE_CLOSING ) // received ACK |
---|
1423 | { |
---|
1424 | // update socket.state |
---|
1425 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
1426 | TCP_STATE_CLOSED ); // todo change to TIME_WAIT |
---|
1427 | |
---|
1428 | // TODO start the MSL timer / turn off others timers |
---|
1429 | |
---|
1430 | } |
---|
1431 | else if( socket_state == TCP_STATE_TIME_WAIT ) |
---|
1432 | { |
---|
1433 | // TODO wait msl_time_out before unblocking TX thread |
---|
1434 | |
---|
1435 | // update socket.state when ACK received |
---|
1436 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
1437 | TCP_STATE_CLOSED ); |
---|
1438 | |
---|
1439 | // unblock TX client thead for success |
---|
1440 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_SUCCESS ); |
---|
1441 | } |
---|
1442 | else if( socket_state == TCP_STATE_CLOSE_WAIT ) |
---|
1443 | { |
---|
1444 | // do nothing |
---|
1445 | } |
---|
1446 | else if( socket_state == TCP_STATE_LAST_ACK ) |
---|
1447 | { |
---|
1448 | // update socket.state when ACK received |
---|
1449 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
1450 | TCP_STATE_CLOSED ); |
---|
1451 | |
---|
1452 | // unblock TX client thead for success |
---|
1453 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_SUCCESS ); |
---|
1454 | } |
---|
1455 | } // end case connecteded states |
---|
1456 | } // end switch socket state |
---|
1457 | |
---|
1458 | // release the lock protecting socket state |
---|
1459 | remote_queuelock_release( socket_lock_xp ); |
---|
1460 | |
---|
1461 | return; |
---|
1462 | |
---|
1463 | } // end if attached socket |
---|
1464 | |
---|
1465 | // 4. scan the list of listening sockets |
---|
1466 | listening_match = false; |
---|
1467 | |
---|
1468 | // get pointers on NIC_RX[0] chdev |
---|
1469 | xptr_t rx0_chdev_xp = chdev_dir.nic_rx[0]; |
---|
1470 | chdev_t * rx0_chdev_ptr = GET_PTR( rx0_chdev_xp ); |
---|
1471 | cxy_t rx0_chdev_cxy = GET_CXY( rx0_chdev_xp ); |
---|
1472 | |
---|
1473 | // build extended pointers on list of listening sockets |
---|
1474 | xptr_t rx0_root_xp = XPTR( rx0_chdev_cxy , &rx0_chdev_ptr->ext.nic.root ); |
---|
1475 | xptr_t rx0_lock_xp = XPTR( rx0_chdev_cxy , &rx0_chdev_ptr->ext.nic.lock ); |
---|
1476 | |
---|
1477 | // take the lock protecting the list of listening sockets |
---|
1478 | remote_busylock_acquire( rx0_lock_xp ); |
---|
1479 | |
---|
1480 | // scan the xlist of listening socket |
---|
1481 | XLIST_FOREACH( rx0_root_xp , iter_xp ) |
---|
1482 | { |
---|
1483 | // get socket cluster and local pointer |
---|
1484 | socket_xp = XLIST_ELEMENT( iter_xp , socket_t , rx_list ); |
---|
1485 | socket_ptr = GET_PTR( socket_xp ); |
---|
1486 | socket_cxy = GET_CXY( socket_xp ); |
---|
1487 | |
---|
1488 | // get relevant socket type and state |
---|
1489 | socket_type = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->type )); |
---|
1490 | socket_state = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->state )); |
---|
1491 | |
---|
1492 | // check socket type and state |
---|
1493 | assert( (socket_type == SOCK_STREAM ) , "illegal socket type" ); |
---|
1494 | assert( (socket_state == TCP_STATE_LISTEN ) , "illegal socket state" ); |
---|
1495 | |
---|
1496 | // get relevant socket infos for matching |
---|
1497 | socket_local_addr = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->local_addr )); |
---|
1498 | socket_local_port = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->local_port )); |
---|
1499 | |
---|
1500 | // compute matching condition for a listening socket |
---|
1501 | listening_match = (socket_local_addr == seg_local_addr) && |
---|
1502 | (socket_local_port == seg_local_port); |
---|
1503 | |
---|
1504 | // exit loop if matching |
---|
1505 | if( listening_match ) |
---|
1506 | { |
---|
1507 | |
---|
1508 | #if DEBUG_DEV_NIC_RX |
---|
1509 | fdid = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->fdid ) ); |
---|
1510 | pid = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->pid ) ); |
---|
1511 | if( cycle > DEBUG_DEV_NIC_RX ) |
---|
1512 | printk("\n[%s] thread[%x,%x] matching listening socket[%d,%d] / state %s\n", |
---|
1513 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, socket_state_str(socket_state) ); |
---|
1514 | #endif |
---|
1515 | break; |
---|
1516 | } |
---|
1517 | } // end loop on listening sockets |
---|
1518 | |
---|
1519 | // release the lock protecting the list of listening sockets |
---|
1520 | remote_busylock_release( rx0_lock_xp ); |
---|
1521 | |
---|
1522 | // 5. handle TCP segment for a matching listening socket |
---|
1523 | if( listening_match ) |
---|
1524 | { |
---|
1525 | // The actions depend on the received segment flags |
---|
1526 | // - discard segment for RST or ACK |
---|
1527 | // - update socket state & remote IP address, |
---|
1528 | // register connect request in socket CRQ queue, |
---|
1529 | // and unblock client thread for SYN |
---|
1530 | |
---|
1531 | // discard segment if RST flag |
---|
1532 | if( seg_rst_set ) |
---|
1533 | { |
---|
1534 | |
---|
1535 | #if DEBUG_DEV_NIC_RX |
---|
1536 | if( cycle > DEBUG_DEV_NIC_RX ) |
---|
1537 | printk("\n[%s] thread[%x,%x] for listening socket[%x,%d] : received RST\n", |
---|
1538 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid ); |
---|
1539 | #endif |
---|
1540 | return; |
---|
1541 | } |
---|
1542 | |
---|
1543 | // discard segment if ACK flag |
---|
1544 | if( seg_ack_set ) |
---|
1545 | { |
---|
1546 | |
---|
1547 | #if DEBUG_DEV_NIC_RX |
---|
1548 | if( cycle > DEBUG_DEV_NIC_RX ) |
---|
1549 | printk("\n[%s] thread[%x,%x] for listening socket[%x,%d] : received ACK\n", |
---|
1550 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid ); |
---|
1551 | #endif |
---|
1552 | return; |
---|
1553 | } |
---|
1554 | |
---|
1555 | // SYN flag == CONNECT request / seq_num cannot be wrong |
---|
1556 | if( seg_syn_set ) |
---|
1557 | { |
---|
1558 | // build extended pointer on listening socket CRQ |
---|
1559 | socket_crqq_xp = XPTR( socket_cxy , &socket_ptr->crqq ); |
---|
1560 | |
---|
1561 | // try to register request into CRQ queue |
---|
1562 | error = socket_put_crq_request( socket_crqq_xp, |
---|
1563 | seg_remote_addr, |
---|
1564 | seg_remote_port, |
---|
1565 | seg_seq_num, |
---|
1566 | seg_window ); |
---|
1567 | |
---|
1568 | if ( error ) // CRQ full |
---|
1569 | { |
---|
1570 | |
---|
1571 | #if DEBUG_DEV_NIC_RX |
---|
1572 | if( cycle > DEBUG_DEV_NIC_RX ) |
---|
1573 | printk("\n[%s] thread[%x,%x] listening socket[%x,%d] CRQ full => send RST\n", |
---|
1574 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid ); |
---|
1575 | #endif |
---|
1576 | // make an RST request to R2T queue |
---|
1577 | socket_put_r2t_request( socket_r2tq_xp, |
---|
1578 | TCP_FLAG_RST, |
---|
1579 | chdev->channel ); |
---|
1580 | } |
---|
1581 | else // new connection request registered in CRQ |
---|
1582 | { |
---|
1583 | |
---|
1584 | #if DEBUG_DEV_NIC_RX |
---|
1585 | if( cycle > DEBUG_DEV_NIC_RX ) |
---|
1586 | printk("\n[%s] thread[%x,%x] for listening socket[%x,%d] : register request in CRQ\n", |
---|
1587 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid ); |
---|
1588 | #endif |
---|
1589 | // check pending RX_ACCEPT command |
---|
1590 | if( (hal_remote_l32(XPTR(socket_cxy,&socket_ptr->rx_valid)) == true) && |
---|
1591 | (hal_remote_l32(XPTR(socket_cxy,&socket_ptr->rx_cmd)) == CMD_RX_ACCEPT) ) |
---|
1592 | { |
---|
1593 | // reset rx_valid |
---|
1594 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_valid ), false ); |
---|
1595 | |
---|
1596 | // report success to RX client thread |
---|
1597 | dev_nic_unblock_rx_client( socket_xp , CMD_STS_SUCCESS ); |
---|
1598 | |
---|
1599 | #if DEBUG_DEV_NIC_RX |
---|
1600 | if( cycle > DEBUG_DEV_NIC_RX ) |
---|
1601 | printk("\n[%s] thread[%x,%x] for listening socket[%x,%d] unblock RX client thread\n", |
---|
1602 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid ); |
---|
1603 | #endif |
---|
1604 | } |
---|
1605 | } // end register request in CRQ |
---|
1606 | } // end if SYN |
---|
1607 | |
---|
1608 | return; |
---|
1609 | |
---|
1610 | } // end if listening_match |
---|
1611 | |
---|
1612 | // 6. no socket found => discard segment |
---|
1613 | |
---|
1614 | #if DEBUG_DEV_NIC_RX |
---|
1615 | if( cycle > DEBUG_DEV_NIC_RX ) |
---|
1616 | printk("\n[%s] thread[%x,%x] exit failure : no socket found => discard segment\n", |
---|
1617 | __FUNCTION__, this->process->pid, this->trdid ); |
---|
1618 | #endif |
---|
1619 | |
---|
1620 | } // end dev_nic_rx_handle_tcp_segment() |
---|
1621 | |
---|
1622 | |
---|
1623 | ///////////////////////////////////////// |
---|
1624 | void dev_nic_rx_server( chdev_t * chdev ) |
---|
1625 | { |
---|
1626 | uint8_t k_buf[2048]; // kernel buffer for one ETH/IP/UDP packet |
---|
1627 | uint32_t pkt_src_addr; // packet source IP address |
---|
1628 | uint32_t pkt_dst_addr; // packet destination IP address |
---|
1629 | uint32_t trsp_protocol; // transport protocol (TCP / UDP) |
---|
1630 | uint32_t eth_length; // size of Ethernet packet (bytes) |
---|
1631 | uint32_t ip_length; // size of IP packet in bytes |
---|
1632 | error_t error; |
---|
1633 | |
---|
1634 | thread_t * this = CURRENT_THREAD; |
---|
1635 | |
---|
1636 | // check thread can yield |
---|
1637 | thread_assert_can_yield( this , __FUNCTION__ ); |
---|
1638 | |
---|
1639 | // check chdev direction and type |
---|
1640 | assert( (chdev->func == DEV_FUNC_NIC) && (chdev->is_rx == true) , |
---|
1641 | "illegal chdev type or direction" ); |
---|
1642 | |
---|
1643 | #if DEBUG_DEV_NIC_RX |
---|
1644 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
1645 | if( cycle > DEBUG_DEV_NIC_RX ) |
---|
1646 | printk("\n[%s] thread[%x,%x] starts / cycle %d\n", |
---|
1647 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
1648 | #endif |
---|
1649 | |
---|
1650 | // get extended pointers on server tread and chdev |
---|
1651 | xptr_t thread_xp = XPTR( local_cxy , this ); |
---|
1652 | xptr_t chdev_xp = XPTR( local_cxy , chdev ); |
---|
1653 | |
---|
1654 | while( 1 ) |
---|
1655 | { |
---|
1656 | // call NIC driver to move one packet from NIC_RX queue to kernel buffer |
---|
1657 | this->nic_cmd.dev_xp = chdev_xp; |
---|
1658 | this->nic_cmd.type = NIC_CMD_READ; |
---|
1659 | this->nic_cmd.buffer = k_buf; |
---|
1660 | chdev->cmd( XPTR( local_cxy , this ) ); |
---|
1661 | |
---|
1662 | // get packet length |
---|
1663 | eth_length = this->nic_cmd.status; |
---|
1664 | |
---|
1665 | // check success |
---|
1666 | if( eth_length == 0 ) // queue empty => block and deschedule |
---|
1667 | { |
---|
1668 | |
---|
1669 | #if DEBUG_DEV_NIC_RX |
---|
1670 | cycle = (uint32_t)hal_get_cycles(); |
---|
1671 | if( DEBUG_DEV_NIC_RX < cycle ) |
---|
1672 | printk("\n[%s] thread[%x,%x] NIC_RX_QUEUE empty => blocks on <ISR> / cycle %d\n", |
---|
1673 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
1674 | #endif |
---|
1675 | // enable NIC_RX IRQ |
---|
1676 | dev_pic_enable_irq( this->core->lid , chdev_xp ); |
---|
1677 | |
---|
1678 | // block and deschedule |
---|
1679 | thread_block( thread_xp , THREAD_BLOCKED_ISR ); |
---|
1680 | sched_yield("client blocked on NIC_TX queue full"); |
---|
1681 | |
---|
1682 | // disable NIC-RX IRQ |
---|
1683 | dev_pic_disable_irq( this->core->lid , chdev_xp ); |
---|
1684 | |
---|
1685 | #if DEBUG_DEV_NIC_RX |
---|
1686 | cycle = (uint32_t)hal_get_cycles(); |
---|
1687 | if( DEBUG_DEV_NIC_RX < cycle ) |
---|
1688 | printk("\n[%s] thread[%x,%x] resumes / cycle %d\n", |
---|
1689 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
1690 | #endif |
---|
1691 | |
---|
1692 | } |
---|
1693 | else // success => handle packet |
---|
1694 | { |
---|
1695 | |
---|
1696 | #if DEBUG_DEV_NIC_RX |
---|
1697 | cycle = (uint32_t)hal_get_cycles(); |
---|
1698 | if( DEBUG_DEV_NIC_RX < cycle ) |
---|
1699 | dev_nic_packet_display( false, // is_tx |
---|
1700 | this->process->pid, |
---|
1701 | this->trdid, |
---|
1702 | cycle, |
---|
1703 | k_buf ); |
---|
1704 | #endif |
---|
1705 | |
---|
1706 | // analyse the ETH header |
---|
1707 | error = dev_nic_rx_check_eth( k_buf, |
---|
1708 | &ip_length ); |
---|
1709 | |
---|
1710 | // discard packet if error reported by Ethernet layer |
---|
1711 | if( error ) |
---|
1712 | { |
---|
1713 | |
---|
1714 | #if DEBUG_DEV_NIC_RX |
---|
1715 | cycle = (uint32_t)hal_get_cycles(); |
---|
1716 | if( DEBUG_DEV_NIC_RX < cycle ) |
---|
1717 | printk("\n[%s] thread[%x,%x] discard ETH packet / cycle %d\n", |
---|
1718 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
1719 | #endif |
---|
1720 | continue; |
---|
1721 | } |
---|
1722 | |
---|
1723 | #if (DEBUG_DEV_NIC_RX & 1) |
---|
1724 | cycle = (uint32_t)hal_get_cycles(); |
---|
1725 | if( DEBUG_DEV_NIC_RX < cycle ) |
---|
1726 | printk("\n[%s] thread[%x,%x] successfully checked ETH packet / cycle %d\n", |
---|
1727 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
1728 | #endif |
---|
1729 | // analyse the IP header |
---|
1730 | error = dev_nic_rx_check_ip( k_buf + ETH_HEAD_LEN, |
---|
1731 | ip_length, |
---|
1732 | &pkt_src_addr, |
---|
1733 | &pkt_dst_addr, |
---|
1734 | &trsp_protocol ); |
---|
1735 | |
---|
1736 | // discard packet if error reported by IP layer |
---|
1737 | if( error ) |
---|
1738 | { |
---|
1739 | |
---|
1740 | #if DEBUG_DEV_NIC_RX |
---|
1741 | cycle = (uint32_t)hal_get_cycles(); |
---|
1742 | if( DEBUG_DEV_NIC_RX < cycle ) |
---|
1743 | printk("\n[%s] thread[%x,%x] discarded IP packet / cycle %d\n", |
---|
1744 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
1745 | #endif |
---|
1746 | continue; |
---|
1747 | } |
---|
1748 | |
---|
1749 | #if (DEBUG_DEV_NIC_RX & 1 ) |
---|
1750 | cycle = (uint32_t)hal_get_cycles(); |
---|
1751 | if( (DEBUG_DEV_NIC_RX < cycle) && (trsp_protocol == PROTOCOL_UDP) ) |
---|
1752 | printk("\n[%s] thread[%x,%x] successfully checked UDP packet / cycle %d\n", |
---|
1753 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
1754 | if( (DEBUG_DEV_NIC_RX < cycle) && (trsp_protocol == PROTOCOL_TCP) ) |
---|
1755 | printk("\n[%s] thread[%x,%x] successfully checked TCP segment / cycle %d\n", |
---|
1756 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
1757 | #endif |
---|
1758 | |
---|
1759 | // call relevant transport protocol |
---|
1760 | if( trsp_protocol == PROTOCOL_UDP ) |
---|
1761 | { |
---|
1762 | dev_nic_rx_handle_udp_packet( chdev, |
---|
1763 | k_buf + ETH_HEAD_LEN + IP_HEAD_LEN, |
---|
1764 | ip_length - IP_HEAD_LEN, |
---|
1765 | pkt_src_addr, |
---|
1766 | pkt_dst_addr ); |
---|
1767 | } |
---|
1768 | else if ( trsp_protocol == PROTOCOL_TCP) |
---|
1769 | { |
---|
1770 | dev_nic_rx_handle_tcp_segment( chdev, |
---|
1771 | k_buf + ETH_HEAD_LEN + IP_HEAD_LEN, |
---|
1772 | ip_length - IP_HEAD_LEN, |
---|
1773 | pkt_src_addr, |
---|
1774 | pkt_dst_addr ); |
---|
1775 | } |
---|
1776 | else // discard packet if unsupported transport protocol |
---|
1777 | { |
---|
1778 | |
---|
1779 | #if DEBUG_DEV_NIC_RX |
---|
1780 | cycle = (uint32_t)hal_get_cycles(); |
---|
1781 | if( DEBUG_DEV_NIC_RX < cycle ) |
---|
1782 | printk("\n[%s] thread[%x,%x] discarded unsupported transport protocol %d\n", |
---|
1783 | __FUNCTION__, this->process->pid, this->trdid, trsp_protocol, cycle ); |
---|
1784 | #endif |
---|
1785 | continue; |
---|
1786 | } |
---|
1787 | } |
---|
1788 | } // end of while loop |
---|
1789 | } // end dev_nic_rx_server() |
---|
1790 | |
---|
1791 | |
---|
1792 | |
---|
1793 | |
---|
1794 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
1795 | // Functions used by the NIC_TX server thread |
---|
1796 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
1797 | |
---|
1798 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
1799 | // This static function is called by the dev_nic_tx_build_packet() function. |
---|
1800 | // It moves one ETH/IP/UDP packet from the kernel buffer identified by the <buffer> and |
---|
1801 | // <length> arguments to the NIC_TX_QUEUE identified the <chdev> argument. |
---|
1802 | // It blocks and deschedules on the BLOCKED_ISR condition if the queue is full. |
---|
1803 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
1804 | // @ chdev : [in] local pointer on NIC_TX chdev. |
---|
1805 | // @ k_buf : [in] pointer on a local kernel buffer (2K bytes). |
---|
1806 | // @ length : [in] actual Ethernet packet length in bytes. |
---|
1807 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
1808 | static void dev_nic_tx_move_packet( chdev_t * chdev, |
---|
1809 | uint8_t * k_buf, |
---|
1810 | uint32_t length ) |
---|
1811 | { |
---|
1812 | thread_t * this = CURRENT_THREAD; |
---|
1813 | |
---|
1814 | // get extended pointers on server tread and chdev |
---|
1815 | xptr_t thread_xp = XPTR( local_cxy , this ); |
---|
1816 | xptr_t chdev_xp = XPTR( local_cxy , chdev ); |
---|
1817 | |
---|
1818 | // check thread can yield |
---|
1819 | thread_assert_can_yield( this , __FUNCTION__ ); |
---|
1820 | |
---|
1821 | #if (DEBUG_DEV_NIC_TX & 1) |
---|
1822 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
1823 | if( DEBUG_DEV_NIC_TX < cycle ) |
---|
1824 | printk("\n[%s] thread[%x,%x] enter / buf %x / length %d / cycle %d\n", |
---|
1825 | __FUNCTION__, this->process->pid, this->trdid, k_buf, length, cycle ); |
---|
1826 | #endif |
---|
1827 | |
---|
1828 | // initialize WRITE command in server thread descriptor |
---|
1829 | this->nic_cmd.dev_xp = chdev_xp; |
---|
1830 | this->nic_cmd.type = NIC_CMD_WRITE; |
---|
1831 | this->nic_cmd.buffer = k_buf; |
---|
1832 | this->nic_cmd.length = length; |
---|
1833 | |
---|
1834 | while( 1 ) |
---|
1835 | { |
---|
1836 | // call driver to move TX packet |
---|
1837 | chdev->cmd( thread_xp ); |
---|
1838 | |
---|
1839 | // exit while if success |
---|
1840 | if( this->nic_cmd.status == length ) // exit while & return if success |
---|
1841 | { |
---|
1842 | |
---|
1843 | #if (DEBUG_DEV_NIC_TX & 1) |
---|
1844 | cycle = (uint32_t)hal_get_cycles(); |
---|
1845 | if( DEBUG_DEV_NIC_TX < cycle ) |
---|
1846 | printk("\n[%s] thread[%x,%x] exit SUCCESS / cycle %d\n", |
---|
1847 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
1848 | #endif |
---|
1849 | break; |
---|
1850 | } |
---|
1851 | else // block and deschedule if queue full |
---|
1852 | { |
---|
1853 | |
---|
1854 | #if (DEBUG_DEV_NIC_TX & 1) |
---|
1855 | cycle = (uint32_t)hal_get_cycles(); |
---|
1856 | if( DEBUG_DEV_NIC_TX < cycle ) |
---|
1857 | printk("\n[%s] thread[%x,%x] NIC_TX_QUEUE full => blocks on ISR / cycle %d\n", |
---|
1858 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
1859 | #endif |
---|
1860 | // enable NIC_TX IRQ |
---|
1861 | dev_pic_enable_irq( this->core->lid , chdev_xp ); |
---|
1862 | |
---|
1863 | // TX server thread blocks and deschedules |
---|
1864 | thread_block( thread_xp , THREAD_BLOCKED_ISR ); |
---|
1865 | sched_yield("client blocked on NIC_TX queue full"); |
---|
1866 | |
---|
1867 | // disable NIC-TX IRQ |
---|
1868 | dev_pic_disable_irq( this->core->lid , chdev_xp ); |
---|
1869 | |
---|
1870 | #if (DEBUG_DEV_NIC_TX & 1) |
---|
1871 | cycle = (uint32_t)hal_get_cycles(); |
---|
1872 | if( DEBUG_DEV_NIC_TX < cycle ) |
---|
1873 | printk("\n[%s] thread[%x,%x] resumes / cycle %d\n", |
---|
1874 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
1875 | #endif |
---|
1876 | } |
---|
1877 | } |
---|
1878 | } // end dev_nic_tx_move_packet() |
---|
1879 | |
---|
1880 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
1881 | // This static function is called by the dev_nic_tx_server() function to build an UDP |
---|
1882 | // header in the kernel buffer defined by the <k_buf> arguement, as specified by the |
---|
1883 | // <socket_xp> argument. The <length> argument defines the number of bytes in payload. |
---|
1884 | // It set the "src_port", "dst_port", "total_length" and "checksum" fields in UDP header. |
---|
1885 | // The payload must be previouly loaded in the pernel buffer. |
---|
1886 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
1887 | // @ k_buf : [in] pointer on first byte of UDP header in kernel buffer. |
---|
1888 | // @ socket_xp : [in] extended pointer on socket. |
---|
1889 | // @ length : [in] number of bytes in payload. |
---|
1890 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
1891 | static void dev_nic_tx_build_udp_header( uint8_t * k_buf, |
---|
1892 | xptr_t socket_xp, |
---|
1893 | uint32_t length ) |
---|
1894 | { |
---|
1895 | uint16_t checksum; // checksum value |
---|
1896 | uint32_t total_length; // total UDP packet length |
---|
1897 | uint32_t local_addr; // local IP address |
---|
1898 | uint32_t remote_addr; // remote IP address |
---|
1899 | uint32_t local_port; // local port |
---|
1900 | uint32_t remote_port; // remote port |
---|
1901 | |
---|
1902 | // get socket cluster an local pointer |
---|
1903 | socket_t * socket_ptr = GET_PTR( socket_xp ); |
---|
1904 | cxy_t socket_cxy = GET_CXY( socket_xp ); |
---|
1905 | |
---|
1906 | // get relevant infos from socket |
---|
1907 | local_addr = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->local_addr )); |
---|
1908 | remote_addr = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->remote_addr )); |
---|
1909 | local_port = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->local_port )); |
---|
1910 | remote_port = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->remote_port )); |
---|
1911 | |
---|
1912 | // compute UDP packet total length |
---|
1913 | total_length = length + UDP_HEAD_LEN; |
---|
1914 | |
---|
1915 | // set src_port and dst_port in header |
---|
1916 | k_buf[0] = local_port >> 8; |
---|
1917 | k_buf[1] = local_port; |
---|
1918 | k_buf[2] = remote_port >> 8; |
---|
1919 | k_buf[3] = remote_port; |
---|
1920 | |
---|
1921 | // set packet length in header |
---|
1922 | k_buf[4] = total_length >> 8; |
---|
1923 | k_buf[5] = total_length; |
---|
1924 | |
---|
1925 | // compute UDP packet checksum |
---|
1926 | checksum = dev_nic_udp_checksum( k_buf , total_length ); |
---|
1927 | |
---|
1928 | // set checksum |
---|
1929 | k_buf[6] = checksum >> 8; |
---|
1930 | k_buf[7] = checksum; |
---|
1931 | |
---|
1932 | } // end dev_nic_tx_build_udp_header() |
---|
1933 | |
---|
1934 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
1935 | // This static function is called by the dev_nic_tx_server() function. |
---|
1936 | // It builds a TCP header in the kernel buffer defined by the <k_buf> argument. |
---|
1937 | // The payload must have been previouly registered in this buffer. |
---|
1938 | // The "local_addr", "local_port", "remote_addr", "remote_port", seq_num", "ack_num", |
---|
1939 | // and "window" fields are obtained from the <socket_xp> argument. |
---|
1940 | // The <length> argument defines the number of bytes in payload, and the <flags> argument |
---|
1941 | // defines the flags to be set in TCP header. |
---|
1942 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
1943 | // @ k_buf : [in] pointer on first byte of TCP header in kernel buffer. |
---|
1944 | // @ socket_xp : [in] extended pointer on socket. |
---|
1945 | // @ length : [in] number of bytes in payload. |
---|
1946 | // @ flags : [in] flags to be set in TCP header. |
---|
1947 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
1948 | static void dev_nic_tx_build_tcp_header( uint8_t * k_buf, |
---|
1949 | xptr_t socket_xp, |
---|
1950 | uint32_t length, |
---|
1951 | uint8_t flags ) |
---|
1952 | { |
---|
1953 | uint16_t checksum; // global segment checksum |
---|
1954 | uint32_t total_length; // total UDP packet length |
---|
1955 | uint32_t src_addr; // local IP address |
---|
1956 | uint32_t dst_addr; // remote IP address |
---|
1957 | uint16_t src_port; // local port |
---|
1958 | uint16_t dst_port; // remote port |
---|
1959 | uint32_t seq_num; // first byte of segment in TX stream |
---|
1960 | uint32_t ack_num; // next expected byte in RX stream |
---|
1961 | uint32_t window; // window of accepted segments in RX stream |
---|
1962 | |
---|
1963 | // get socket cluster an local pointer |
---|
1964 | socket_t * sock_ptr = GET_PTR( socket_xp ); |
---|
1965 | cxy_t sock_cxy = GET_CXY( socket_xp ); |
---|
1966 | |
---|
1967 | // get relevant infos from socket |
---|
1968 | src_addr = hal_remote_l32(XPTR( sock_cxy , &sock_ptr->local_addr )); |
---|
1969 | dst_addr = hal_remote_l32(XPTR( sock_cxy , &sock_ptr->remote_addr )); |
---|
1970 | src_port = hal_remote_l32(XPTR( sock_cxy , &sock_ptr->local_port )); |
---|
1971 | dst_port = hal_remote_l32(XPTR( sock_cxy , &sock_ptr->remote_port )); |
---|
1972 | seq_num = hal_remote_l32(XPTR( sock_cxy , &sock_ptr->tx_nxt )); |
---|
1973 | ack_num = hal_remote_l32(XPTR( sock_cxy , &sock_ptr->rx_nxt )); |
---|
1974 | window = hal_remote_l32(XPTR( sock_cxy , &sock_ptr->rx_wnd )); |
---|
1975 | |
---|
1976 | // compute TCP segment total length |
---|
1977 | total_length = length + TCP_HEAD_LEN; |
---|
1978 | |
---|
1979 | // set "src_port" and "dst_port" |
---|
1980 | k_buf[0] = src_port >> 8; |
---|
1981 | k_buf[1] = src_port; |
---|
1982 | k_buf[2] = dst_port >> 8; |
---|
1983 | k_buf[3] = dst_port; |
---|
1984 | |
---|
1985 | // set "seq_num" |
---|
1986 | k_buf[4] = seq_num >> 24; |
---|
1987 | k_buf[5] = seq_num >> 16; |
---|
1988 | k_buf[6] = seq_num >> 8; |
---|
1989 | k_buf[7] = seq_num; |
---|
1990 | |
---|
1991 | // set "ack_num" |
---|
1992 | k_buf[8] = ack_num >> 24; |
---|
1993 | k_buf[9] = ack_num >> 16; |
---|
1994 | k_buf[10] = ack_num >> 8; |
---|
1995 | k_buf[11] = ack_num; |
---|
1996 | |
---|
1997 | // set "hlen" |
---|
1998 | k_buf[12] = 5; |
---|
1999 | |
---|
2000 | // set "flags" |
---|
2001 | k_buf[13] = flags & 0x3F; |
---|
2002 | |
---|
2003 | // set "window" |
---|
2004 | k_buf[14] = window >> 8; |
---|
2005 | k_buf[15] = window; |
---|
2006 | |
---|
2007 | // reset "checksum" |
---|
2008 | k_buf[16] = 0; |
---|
2009 | k_buf[17] = 0; |
---|
2010 | |
---|
2011 | // set "urgent_ptr" |
---|
2012 | k_buf[18] = 0; |
---|
2013 | k_buf[19] = 0; |
---|
2014 | |
---|
2015 | // compute TCP segment checksum |
---|
2016 | checksum = dev_nic_tcp_checksum( k_buf, |
---|
2017 | total_length, |
---|
2018 | src_addr, |
---|
2019 | dst_addr ); |
---|
2020 | // set "checksum" |
---|
2021 | k_buf[16] = checksum >> 8; |
---|
2022 | k_buf[17] = checksum; |
---|
2023 | |
---|
2024 | } // end dev_nic_tx_build_tcp_header() |
---|
2025 | |
---|
2026 | |
---|
2027 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
2028 | // This static function is called by the dev_nic_tx_server() function. |
---|
2029 | // It builds the IP header in the 20 first bytes of <buffer>. |
---|
2030 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
2031 | // @ buffer : pointer on first byte of IP header in kernel buffer |
---|
2032 | // @ src_addr : source IP address. |
---|
2033 | // @ dst_addr : destination IP address. |
---|
2034 | // @ length : number of bytes in IP packet payload. |
---|
2035 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
2036 | static void dev_nic_tx_build_ip_header( uint8_t * buffer, |
---|
2037 | uint32_t src_addr, |
---|
2038 | uint32_t dst_addr, |
---|
2039 | uint8_t protocol, |
---|
2040 | uint16_t length ) |
---|
2041 | { |
---|
2042 | uint16_t hcs; |
---|
2043 | |
---|
2044 | uint16_t total = length + IP_HEAD_LEN; |
---|
2045 | |
---|
2046 | buffer[0] = 0x45; // IPV4 / IHL = 20 bytes |
---|
2047 | buffer[1] = 0; // DSCP / ECN |
---|
2048 | buffer[2] = total >> 8; |
---|
2049 | buffer[3] = total; |
---|
2050 | |
---|
2051 | buffer[4] = 0x40; // Don't Fragment |
---|
2052 | buffer[5] = 0; |
---|
2053 | buffer[6] = 0; |
---|
2054 | buffer[7] = 0; |
---|
2055 | |
---|
2056 | buffer[8] = 0xFF; // TTL |
---|
2057 | buffer[9] = protocol; // transport protocol |
---|
2058 | |
---|
2059 | buffer[12] = src_addr >> 24; |
---|
2060 | buffer[13] = src_addr >> 16; |
---|
2061 | buffer[14] = src_addr >> 8; |
---|
2062 | buffer[15] = src_addr; |
---|
2063 | |
---|
2064 | buffer[16] = dst_addr >> 24; |
---|
2065 | buffer[17] = dst_addr >> 16; |
---|
2066 | buffer[18] = dst_addr >> 8; |
---|
2067 | buffer[19] = dst_addr; |
---|
2068 | |
---|
2069 | // compute IP header checksum |
---|
2070 | hcs = dev_nic_ip_checksum( buffer ); |
---|
2071 | |
---|
2072 | // set checksum |
---|
2073 | buffer[10] = hcs >> 8; |
---|
2074 | buffer[11] = hcs; |
---|
2075 | |
---|
2076 | } // end dev_nic_tx_build_ip_header |
---|
2077 | |
---|
2078 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
2079 | // This static function is called by the dev_nic_tx_server() function. |
---|
2080 | // It builds the Ethernet header in the 14 first bytes of <buffer>. |
---|
2081 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
2082 | // @ buffer : pointer on first byte of Ethernet header in kernel buffer |
---|
2083 | // @ src_mac_54 : two MSB bytes in source MAC address. |
---|
2084 | // @ src_mac_32 : two MED bytes in source MAC address. |
---|
2085 | // @ src_mac_10 : two LSB bytes in source MAC address. |
---|
2086 | // @ dst_mac_54 : two MSB bytes in destination MAC address. |
---|
2087 | // @ dst_mac_32 : two MED bytes in destination MAC address. |
---|
2088 | // @ dst_mac_10 : two LSB bytes in destination MAC address. |
---|
2089 | // @ length : number of bytes in Ethernet frame payload. |
---|
2090 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
2091 | static void dev_nic_tx_build_eth_header( uint8_t * buffer, |
---|
2092 | uint8_t src_mac_5, |
---|
2093 | uint8_t src_mac_4, |
---|
2094 | uint8_t src_mac_3, |
---|
2095 | uint8_t src_mac_2, |
---|
2096 | uint8_t src_mac_1, |
---|
2097 | uint8_t src_mac_0, |
---|
2098 | uint8_t dst_mac_5, |
---|
2099 | uint8_t dst_mac_4, |
---|
2100 | uint8_t dst_mac_3, |
---|
2101 | uint8_t dst_mac_2, |
---|
2102 | uint8_t dst_mac_1, |
---|
2103 | uint8_t dst_mac_0, |
---|
2104 | uint32_t length ) |
---|
2105 | { |
---|
2106 | buffer[0] = dst_mac_5; |
---|
2107 | buffer[1] = dst_mac_4; |
---|
2108 | buffer[2] = dst_mac_3; |
---|
2109 | buffer[3] = dst_mac_2; |
---|
2110 | buffer[4] = dst_mac_1; |
---|
2111 | buffer[5] = dst_mac_0; |
---|
2112 | |
---|
2113 | buffer[6] = src_mac_5; |
---|
2114 | buffer[7] = src_mac_4; |
---|
2115 | buffer[8] = src_mac_3; |
---|
2116 | buffer[9] = src_mac_2; |
---|
2117 | buffer[10] = src_mac_1; |
---|
2118 | buffer[11] = src_mac_0; |
---|
2119 | |
---|
2120 | buffer[12] = length >> 8; |
---|
2121 | buffer[13] = length; |
---|
2122 | |
---|
2123 | } // end dev_nic_tx_build_eth_header() |
---|
2124 | |
---|
2125 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
2126 | // This static function is called by the dev_nic_tx_server() function to handle one TX |
---|
2127 | // command, or one R2T request, as defined by the <cmd_valid> and <r2t_valid> arguments, |
---|
2128 | // for the socket identified by the <socket_xp> argument. It builds an ETH/IP/UDP packet |
---|
2129 | // or ETH/IP/TCP segment, in the buffer defined by the <k_buf> argument, and registers |
---|
2130 | // it in the NIC_TX queue defined by the <chdev> argument. |
---|
2131 | // For a TCP header, the "seq_num", ack_num", and "window" fiels are defined by the |
---|
2132 | // "socket.tx_next", "socket.rx_next" and "socket.rx_wnd" fields respectively. |
---|
2133 | // It updates the "socket.state", "socket.tx_nxt", "socket.r2tq", and "socket.crqq" |
---|
2134 | // The supported TX command types are CONNECT / ACCEPT / SEND / CLOSE. |
---|
2135 | // fields as required by the command type. |
---|
2136 | // - For an UDP socket, it reset the "socket.tx_valid" field, and unblock the client |
---|
2137 | // thread when the packet has been sent, or when an error must be reported. |
---|
2138 | // - For a TCP socket, it reset the "socket.tx_valid" field when the segment has been |
---|
2139 | // sent, but does not unblocks the client thread, that will be unblocqued by the |
---|
2140 | // NIC_RX thread when the TX command is fully completed. |
---|
2141 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
2142 | // To build a packet, it makes the following actions: |
---|
2143 | // 1) it takes the lock protecting the socket state. |
---|
2144 | // 2) it get the command arguments from socket descriptor. |
---|
2145 | // 3) it build an UDP packet or a TCP segment, depending on command type and socket state. |
---|
2146 | // 4) it updates the socket state. |
---|
2147 | // 5) it releases the lock protecting the socket. |
---|
2148 | // 6) it build the IP header. |
---|
2149 | // 7) it build the ETH header. |
---|
2150 | // 8) it copies the packet in the NIC_TX queue. |
---|
2151 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
2152 | // @ cmd_state : [in] TX command valid in socket descriptor. |
---|
2153 | // @ r2t_valid : [in] R2T request valid in command descriptor. |
---|
2154 | // @ socket_xp : [in] extended pointer on client socket. |
---|
2155 | // @ k_buf : [in] local pointer on kernel buffer (2 Kbytes). |
---|
2156 | // @ chdev : [in] local pointer on NIC_RX chdev. |
---|
2157 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
2158 | static void dev_nic_tx_build_packet( bool_t cmd_valid, |
---|
2159 | bool_t r2t_valid, |
---|
2160 | xptr_t socket_xp, |
---|
2161 | uint8_t * k_buf, |
---|
2162 | chdev_t * chdev ) |
---|
2163 | { |
---|
2164 | socket_t * socket_ptr; |
---|
2165 | cxy_t socket_cxy; |
---|
2166 | xptr_t client_xp; // extended pointer on client thread |
---|
2167 | uint32_t cmd_type; // NIC command type |
---|
2168 | uint8_t * tx_buf; // local pointer on kernel buffer for payload |
---|
2169 | uint32_t len; // tx_buf length (bytes) |
---|
2170 | uint32_t todo; // number of bytes not yet sent |
---|
2171 | uint32_t socket_type; // socket type (UDP/TCP) |
---|
2172 | uint32_t socket_state; // socket state |
---|
2173 | xptr_t socket_lock_xp; // extended pointer on socket lock |
---|
2174 | xptr_t socket_r2tq_xp; // extended pointer on R2T queue |
---|
2175 | uint32_t src_ip_addr; // source IP address |
---|
2176 | uint32_t dst_ip_addr; // destination IP address |
---|
2177 | uint32_t tx_nxt; // next sequence number in TX stream |
---|
2178 | uint32_t nbytes; // number of bytes in UDP/TCP packet payload |
---|
2179 | uint8_t * k_trsp_base; // pointer on UDP/TCP packet in kernel buffer |
---|
2180 | uint32_t trsp_length; // length of TCP/UDP packet |
---|
2181 | uint8_t trsp_protocol; // transport protocol type (UDP/TCP) |
---|
2182 | uint8_t r2t_flags; // flags defined by one R2T queue request |
---|
2183 | bool_t do_send; // build & send a packet when true |
---|
2184 | |
---|
2185 | // get socket cluster and local pointer |
---|
2186 | socket_cxy = GET_CXY( socket_xp ); |
---|
2187 | socket_ptr = GET_PTR( socket_xp ); |
---|
2188 | |
---|
2189 | #if DEBUG_DEV_NIC_TX |
---|
2190 | thread_t * this = CURRENT_THREAD;; |
---|
2191 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
2192 | uint32_t fdid = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->fdid )); |
---|
2193 | uint32_t pid = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->pid )); |
---|
2194 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2195 | printk("\n[%s] thread[%x,%x] enter for socket[%x,%d] : cmd_valid %d / r2t_valid %d / cycle %d\n", |
---|
2196 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, cmd_valid, r2t_valid, cycle ); |
---|
2197 | #endif |
---|
2198 | |
---|
2199 | // build extended pointers on socket lock and r2t queue |
---|
2200 | socket_lock_xp = XPTR( socket_cxy , &socket_ptr->lock ); |
---|
2201 | socket_r2tq_xp = XPTR( socket_cxy , &socket_ptr->r2tq ); |
---|
2202 | |
---|
2203 | // 1. take lock protecting this socket |
---|
2204 | remote_queuelock_acquire( socket_lock_xp ); |
---|
2205 | |
---|
2206 | // get relevant socket infos |
---|
2207 | socket_type = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->type )); |
---|
2208 | socket_state = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->state )); |
---|
2209 | src_ip_addr = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->local_addr )); |
---|
2210 | dst_ip_addr = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->remote_addr )); |
---|
2211 | |
---|
2212 | // compute UDP/TCP packet base in kernel buffer |
---|
2213 | k_trsp_base = k_buf + ETH_HEAD_LEN + IP_HEAD_LEN; |
---|
2214 | |
---|
2215 | // set default values |
---|
2216 | do_send = false; |
---|
2217 | trsp_length = 0; |
---|
2218 | nbytes = 0; |
---|
2219 | |
---|
2220 | if( cmd_valid ) // handle TX command |
---|
2221 | { |
---|
2222 | // 2. get command arguments from socket |
---|
2223 | cmd_type = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->tx_cmd )); |
---|
2224 | tx_buf = hal_remote_lpt( XPTR( socket_cxy , &socket_ptr->tx_buf )); |
---|
2225 | len = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->tx_len )); |
---|
2226 | todo = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->tx_todo )); |
---|
2227 | client_xp = hal_remote_l64( XPTR( socket_cxy , &socket_ptr->tx_client )); |
---|
2228 | |
---|
2229 | #if DEBUG_DEV_NIC_TX |
---|
2230 | cycle = (uint32_t)hal_get_cycles(); |
---|
2231 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2232 | printk("\n[%s] thread[%x,%x] cmd_valid for socket[%x,%d] : %s / %s / cycle %d\n", |
---|
2233 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
2234 | socket_cmd_type_str(cmd_type), socket_state_str(socket_state), cycle ); |
---|
2235 | #endif |
---|
2236 | |
---|
2237 | ////////////////////////////////////////////////////////// |
---|
2238 | // 3. UDP : build UDP packet and update UDP socket state |
---|
2239 | if( socket_type == SOCK_DGRAM ) |
---|
2240 | { |
---|
2241 | trsp_protocol = PROTOCOL_UDP; |
---|
2242 | |
---|
2243 | if( socket_state != UDP_STATE_ESTAB ) |
---|
2244 | { |
---|
2245 | // reset tx_valid |
---|
2246 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_valid ) , false ); |
---|
2247 | |
---|
2248 | // unblock client thread / report error |
---|
2249 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_BADSTATE ); |
---|
2250 | } |
---|
2251 | else |
---|
2252 | { |
---|
2253 | if( cmd_type == CMD_TX_SEND ) |
---|
2254 | { |
---|
2255 | // compute payload length |
---|
2256 | nbytes = ( PAYLOAD_MAX_LEN < todo ) ? PAYLOAD_MAX_LEN : todo; |
---|
2257 | |
---|
2258 | // move payload from tx_buf to 2 Kbytes kernel buffer |
---|
2259 | memcpy( k_trsp_base + UDP_HEAD_LEN, |
---|
2260 | tx_buf + (len - todo), |
---|
2261 | nbytes ); |
---|
2262 | |
---|
2263 | // build UDP header |
---|
2264 | dev_nic_tx_build_udp_header( k_trsp_base, |
---|
2265 | socket_xp, |
---|
2266 | nbytes ); |
---|
2267 | |
---|
2268 | // update "tx_todo" in socket descriptor |
---|
2269 | hal_remote_s32( XPTR(socket_cxy , &socket_ptr->tx_todo), todo - nbytes ); |
---|
2270 | |
---|
2271 | // send UDP packet |
---|
2272 | trsp_length = UDP_HEAD_LEN + nbytes; |
---|
2273 | do_send = true; |
---|
2274 | |
---|
2275 | #if( DEBUG_DEV_NIC_TX & 1) |
---|
2276 | cycle = (uint32_t)hal_get_cycles(); |
---|
2277 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2278 | printk("\n[%s] thread[%x,%x] socket[%x,%d] UDP packet build / length %d / cycle %d\n", |
---|
2279 | __FUNCTION__, this->process->pid, this->trdid, trsp_length , cycle ); |
---|
2280 | #endif |
---|
2281 | if( nbytes == todo ) // last byte sent |
---|
2282 | { |
---|
2283 | // reset tx_valid |
---|
2284 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_valid ) , false ); |
---|
2285 | |
---|
2286 | // report success to TX client |
---|
2287 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_SUCCESS ); |
---|
2288 | } |
---|
2289 | } |
---|
2290 | else // CONNECT, ACCEPT, or CLOSE commands are illegal for UDP |
---|
2291 | { |
---|
2292 | // reset tx_valid |
---|
2293 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_valid ) , false ); |
---|
2294 | |
---|
2295 | // report error |
---|
2296 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_BADCMD ); |
---|
2297 | } |
---|
2298 | } |
---|
2299 | } // end UDP |
---|
2300 | |
---|
2301 | /////////////////////////////////////////////////////////// |
---|
2302 | // 3. TCP : build TCP segment and update TCP socket state |
---|
2303 | else if( socket_type == SOCK_STREAM ) |
---|
2304 | { |
---|
2305 | trsp_protocol = PROTOCOL_TCP; |
---|
2306 | |
---|
2307 | // handle R2T request / initialize r2t_flags |
---|
2308 | if( r2t_valid ) |
---|
2309 | { |
---|
2310 | // build extended pointers on r2t queue |
---|
2311 | socket_r2tq_xp = XPTR( socket_cxy , &socket_ptr->r2tq ); |
---|
2312 | |
---|
2313 | // get one request from R2T queue |
---|
2314 | remote_buf_get_to_kernel( socket_r2tq_xp , &r2t_flags , 1 ); |
---|
2315 | } |
---|
2316 | else |
---|
2317 | { |
---|
2318 | r2t_flags = 0; |
---|
2319 | } |
---|
2320 | |
---|
2321 | //////////////////////////////// |
---|
2322 | if( cmd_type == CMD_TX_CONNECT ) // always executed by a TCP client |
---|
2323 | { |
---|
2324 | if( (socket_state == TCP_STATE_BOUND) || |
---|
2325 | (socket_state == TCP_STATE_LISTEN) ) // send a SYN segment |
---|
2326 | { |
---|
2327 | // initialises socket tx_nxt, and rx_wnd |
---|
2328 | hal_remote_s32(XPTR(socket_cxy , &socket_ptr->tx_nxt), TCP_ISS_CLIENT ); |
---|
2329 | hal_remote_s32(XPTR(socket_cxy , &socket_ptr->rx_wnd), TCP_MAX_WINDOW ); |
---|
2330 | |
---|
2331 | // build TCP SYN segment |
---|
2332 | dev_nic_tx_build_tcp_header( k_trsp_base, |
---|
2333 | socket_xp, |
---|
2334 | 0, // length |
---|
2335 | TCP_FLAG_SYN ); |
---|
2336 | // send segment |
---|
2337 | trsp_length = TCP_HEAD_LEN; |
---|
2338 | do_send = true; |
---|
2339 | |
---|
2340 | #if DEBUG_DEV_NIC_TX |
---|
2341 | cycle = (uint32_t)hal_get_cycles(); |
---|
2342 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2343 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s / CONNECT / " |
---|
2344 | "TCP SYN build / cycle %d\n", |
---|
2345 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
2346 | socket_state_str( socket_state ), cycle ); |
---|
2347 | #endif |
---|
2348 | // update socket.state |
---|
2349 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
2350 | TCP_STATE_SYN_SENT ); |
---|
2351 | |
---|
2352 | // update socket.tx_nxt |
---|
2353 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_nxt ), |
---|
2354 | TCP_ISS_CLIENT + 1 ); |
---|
2355 | |
---|
2356 | // reset tx_valid but do not unblock client thread |
---|
2357 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_valid ), false ); |
---|
2358 | } |
---|
2359 | else // report error for all other socket states |
---|
2360 | { |
---|
2361 | // reset tx_valid |
---|
2362 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_valid ) , false ); |
---|
2363 | |
---|
2364 | // report error |
---|
2365 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_BADSTATE ); |
---|
2366 | } |
---|
2367 | } |
---|
2368 | //////////////////////////////////// |
---|
2369 | else if( cmd_type == CMD_TX_ACCEPT ) // always executed by a TCP server |
---|
2370 | { |
---|
2371 | |
---|
2372 | if( socket_state == TCP_STATE_SYN_RCVD ) // send a SYN-ACK segment |
---|
2373 | { |
---|
2374 | // initialize socket tx_nxt, and rx_wnd |
---|
2375 | hal_remote_s32(XPTR(socket_cxy , &socket_ptr->tx_nxt), TCP_ISS_SERVER ); |
---|
2376 | hal_remote_s32(XPTR(socket_cxy , &socket_ptr->rx_wnd), NIC_RX_BUF_SIZE); |
---|
2377 | |
---|
2378 | // build TCP ACK-SYN segment |
---|
2379 | dev_nic_tx_build_tcp_header( k_trsp_base, |
---|
2380 | socket_xp, |
---|
2381 | 0, // length |
---|
2382 | TCP_FLAG_SYN | TCP_FLAG_ACK ); |
---|
2383 | // send segment |
---|
2384 | trsp_length = TCP_HEAD_LEN; |
---|
2385 | do_send = true; |
---|
2386 | |
---|
2387 | #if DEBUG_DEV_NIC_TX |
---|
2388 | cycle = (uint32_t)hal_get_cycles(); |
---|
2389 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2390 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s / ACCEPT / send SYN-ACK / cycle %d\n", |
---|
2391 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
2392 | socket_state_str( socket_state ), cycle ); |
---|
2393 | #endif |
---|
2394 | // update socket.state |
---|
2395 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
2396 | TCP_STATE_SYN_RCVD ); |
---|
2397 | |
---|
2398 | // update socket.tx_nxt |
---|
2399 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_nxt ), |
---|
2400 | TCP_ISS_SERVER + 1 ); |
---|
2401 | |
---|
2402 | // reset tx_valid but do not unblock client thread |
---|
2403 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_valid ), false ); |
---|
2404 | } |
---|
2405 | else // report error in all other socket states |
---|
2406 | { |
---|
2407 | // reset tx_valid |
---|
2408 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_valid ), false ); |
---|
2409 | |
---|
2410 | // report error to TX client thread |
---|
2411 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_BADSTATE ); |
---|
2412 | } |
---|
2413 | } |
---|
2414 | /////////////////////////////////// |
---|
2415 | else if( cmd_type == CMD_TX_CLOSE ) |
---|
2416 | { |
---|
2417 | if( (socket_state == TCP_STATE_SYN_RCVD ) || |
---|
2418 | (socket_state == TCP_STATE_ESTAB ) || |
---|
2419 | (socket_state == TCP_STATE_CLOSE_WAIT) ) // send a FIN-ACK segment |
---|
2420 | { |
---|
2421 | // get "tx_nxt" from socket descriptor |
---|
2422 | tx_nxt = hal_remote_l32( XPTR(socket_cxy , &socket_ptr->tx_nxt )); |
---|
2423 | |
---|
2424 | // compute next state |
---|
2425 | uint32_t state = (socket_state == TCP_STATE_CLOSE_WAIT) ? |
---|
2426 | TCP_STATE_LAST_ACK : TCP_STATE_FIN_WAIT1; |
---|
2427 | |
---|
2428 | // update socket state |
---|
2429 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), state ); |
---|
2430 | |
---|
2431 | // build TCP FIN segment |
---|
2432 | dev_nic_tx_build_tcp_header( k_trsp_base, |
---|
2433 | socket_xp, |
---|
2434 | 0, // length |
---|
2435 | TCP_FLAG_FIN | TCP_FLAG_ACK ); |
---|
2436 | |
---|
2437 | // update "tx_nxt" in socket descriptor |
---|
2438 | hal_remote_s32( XPTR(socket_cxy , &socket_ptr->tx_nxt), tx_nxt + 1 ); |
---|
2439 | |
---|
2440 | // send segment |
---|
2441 | trsp_length = TCP_HEAD_LEN; |
---|
2442 | do_send = true; |
---|
2443 | |
---|
2444 | #if DEBUG_DEV_NIC_TX |
---|
2445 | cycle = (uint32_t)hal_get_cycles(); |
---|
2446 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2447 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s / CLOSE / send FIN-ACK / cycle %d\n", |
---|
2448 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
2449 | socket_state_str( socket_state ), cycle ); |
---|
2450 | #endif |
---|
2451 | // reset tx_valid but do not unblock client thread |
---|
2452 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_valid ), false ); |
---|
2453 | } |
---|
2454 | else // all other states => signal error |
---|
2455 | { |
---|
2456 | |
---|
2457 | #if DEBUG_DEV_NIC_TX |
---|
2458 | cycle = (uint32_t)hal_get_cycles(); |
---|
2459 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2460 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s / CLOSE / error BADSTATE / cycle %d\n", |
---|
2461 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
2462 | socket_state_str( socket_state ), cycle ); |
---|
2463 | #endif |
---|
2464 | // reset tx_valid |
---|
2465 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_valid ), false ); |
---|
2466 | |
---|
2467 | // report error |
---|
2468 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_BADSTATE ); |
---|
2469 | } |
---|
2470 | } |
---|
2471 | ///////////////////////////////////// |
---|
2472 | else if( cmd_type == CMD_TX_SEND ) |
---|
2473 | { |
---|
2474 | if( (socket_state == TCP_STATE_ESTAB ) || |
---|
2475 | (socket_state == TCP_STATE_CLOSE_WAIT) ) |
---|
2476 | { |
---|
2477 | // get "tx_nxt" from socket descriptor |
---|
2478 | tx_nxt = hal_remote_l32( XPTR(socket_cxy , &socket_ptr->tx_nxt )); |
---|
2479 | |
---|
2480 | // compute actual payload length |
---|
2481 | nbytes = ( PAYLOAD_MAX_LEN < todo ) ? PAYLOAD_MAX_LEN : todo; |
---|
2482 | |
---|
2483 | // compute TCP segment base in kernel buffer |
---|
2484 | k_trsp_base = k_buf + ETH_HEAD_LEN + IP_HEAD_LEN; |
---|
2485 | |
---|
2486 | // move payload to k_buf |
---|
2487 | memcpy( k_trsp_base + TCP_HEAD_LEN, |
---|
2488 | tx_buf + (len - todo), |
---|
2489 | nbytes ); |
---|
2490 | |
---|
2491 | // build TCP header |
---|
2492 | dev_nic_tx_build_tcp_header( k_trsp_base, |
---|
2493 | socket_xp, |
---|
2494 | nbytes, // payload |
---|
2495 | TCP_FLAG_ACK | r2t_flags ); // flags |
---|
2496 | |
---|
2497 | // update "tx_todo" in socket descriptor |
---|
2498 | hal_remote_s32( XPTR(socket_cxy , &socket_ptr->tx_todo), todo - nbytes ); |
---|
2499 | |
---|
2500 | // update "tx_nxt" in socket descriptor |
---|
2501 | hal_remote_s32( XPTR(socket_cxy , &socket_ptr->tx_nxt), tx_nxt + nbytes ); |
---|
2502 | |
---|
2503 | // send TCP segment |
---|
2504 | trsp_length = TCP_HEAD_LEN + nbytes; |
---|
2505 | do_send = true; |
---|
2506 | |
---|
2507 | if( todo == nbytes ) // last byte sent |
---|
2508 | { |
---|
2509 | // reset tx_valid when last byte has been sent |
---|
2510 | hal_remote_s32( XPTR(socket_cxy , &socket_ptr->tx_valid), false ); |
---|
2511 | } |
---|
2512 | |
---|
2513 | #if DEBUG_DEV_NIC_TX |
---|
2514 | cycle = (uint32_t)hal_get_cycles(); |
---|
2515 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2516 | printk("\n[%s] thread[%x,%x] socket[%x,%d] %s / SEND / " |
---|
2517 | "TCP DATA build / payload %d / cycle %d\n", |
---|
2518 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, |
---|
2519 | socket_state_str( socket_state ), nbytes, cycle ); |
---|
2520 | #endif |
---|
2521 | } |
---|
2522 | else // all other socket states |
---|
2523 | { |
---|
2524 | // reset tx_valid |
---|
2525 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_valid ), false ); |
---|
2526 | |
---|
2527 | // report error to TX client thread |
---|
2528 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_BADSTATE ); |
---|
2529 | } |
---|
2530 | } |
---|
2531 | /////////////////////////////////// |
---|
2532 | else // undefined TX command type |
---|
2533 | { |
---|
2534 | // reset tx_valid |
---|
2535 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_valid ), false ); |
---|
2536 | |
---|
2537 | // report error to TX client thread |
---|
2538 | dev_nic_unblock_tx_client( socket_xp , CMD_STS_BADCMD ); |
---|
2539 | } |
---|
2540 | } // end TCP |
---|
2541 | } |
---|
2542 | else // no valid TX command => handle R2T request only |
---|
2543 | { |
---|
2544 | // get one request from R2T queue |
---|
2545 | remote_buf_get_to_kernel( socket_r2tq_xp , &r2t_flags , 1 ); |
---|
2546 | |
---|
2547 | #if DEBUG_DEV_NIC_TX |
---|
2548 | cycle = (uint32_t)hal_get_cycles(); |
---|
2549 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2550 | printk("\n[%s] thread[%x,%x] only r2t_valid for socket[%x,%d] / flags %x / cycle %d\n", |
---|
2551 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, r2t_flags, cycle ); |
---|
2552 | #endif |
---|
2553 | |
---|
2554 | // build TCP header |
---|
2555 | dev_nic_tx_build_tcp_header( k_trsp_base, |
---|
2556 | socket_xp, |
---|
2557 | 0, // payload length |
---|
2558 | r2t_flags ); // flags |
---|
2559 | // send TCP segment |
---|
2560 | trsp_protocol = PROTOCOL_TCP; |
---|
2561 | trsp_length = TCP_HEAD_LEN; |
---|
2562 | do_send = true; |
---|
2563 | } |
---|
2564 | |
---|
2565 | // 4. release the lock protecting the socket |
---|
2566 | remote_queuelock_release( socket_lock_xp ); |
---|
2567 | |
---|
2568 | // return if no packet to send |
---|
2569 | if( do_send == false ) return; |
---|
2570 | |
---|
2571 | // 5. build IP header |
---|
2572 | dev_nic_tx_build_ip_header( k_buf + ETH_HEAD_LEN, |
---|
2573 | src_ip_addr, |
---|
2574 | dst_ip_addr, |
---|
2575 | trsp_protocol, |
---|
2576 | trsp_length ); |
---|
2577 | |
---|
2578 | #if( DEBUG_DEV_NIC_TX & 1) |
---|
2579 | cycle = (uint32_t)hal_get_cycles(); |
---|
2580 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2581 | printk("\n[%s] thread[%x,%x] IP header build / length %d / cycle %d\n", |
---|
2582 | __FUNCTION__, this->process->pid, this->trdid, IP_HEAD_LEN + trsp_length , cycle ); |
---|
2583 | #endif |
---|
2584 | |
---|
2585 | // 6. build ETH header |
---|
2586 | dev_nic_tx_build_eth_header( k_buf, |
---|
2587 | (uint8_t)DST_MAC_5, |
---|
2588 | (uint8_t)DST_MAC_4, |
---|
2589 | (uint8_t)DST_MAC_3, |
---|
2590 | (uint8_t)DST_MAC_2, |
---|
2591 | (uint8_t)DST_MAC_1, |
---|
2592 | (uint8_t)DST_MAC_0, |
---|
2593 | (uint8_t)SRC_MAC_5, |
---|
2594 | (uint8_t)SRC_MAC_4, |
---|
2595 | (uint8_t)SRC_MAC_3, |
---|
2596 | (uint8_t)SRC_MAC_2, |
---|
2597 | (uint8_t)SRC_MAC_1, |
---|
2598 | (uint8_t)SRC_MAC_0, |
---|
2599 | IP_HEAD_LEN + trsp_length ); |
---|
2600 | |
---|
2601 | #if( DEBUG_DEV_NIC_TX & 1) |
---|
2602 | cycle = (uint32_t)hal_get_cycles(); |
---|
2603 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2604 | printk("\n[%s] thread[%x,%x] ETH header build / cycle %d\n", |
---|
2605 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
2606 | #endif |
---|
2607 | |
---|
2608 | // 7. move packet to NIC_TX queue (blocking function) |
---|
2609 | dev_nic_tx_move_packet( chdev, |
---|
2610 | k_buf, |
---|
2611 | ETH_HEAD_LEN + IP_HEAD_LEN + trsp_length ); |
---|
2612 | |
---|
2613 | #if DEBUG_DEV_NIC_TX |
---|
2614 | cycle = (uint32_t)hal_get_cycles(); |
---|
2615 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2616 | printk("\n[%s] thread[%x,%x] for socket[%x,%d] moved packet to NIC_TX / cycle %d\n", |
---|
2617 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, cycle ); |
---|
2618 | #endif |
---|
2619 | |
---|
2620 | } // end dev_nic_tx_build_packet() |
---|
2621 | |
---|
2622 | |
---|
2623 | ///////////////////////////////////////// |
---|
2624 | void dev_nic_tx_server( chdev_t * chdev ) |
---|
2625 | { |
---|
2626 | uint8_t k_buf[NIC_KERNEL_BUF_SIZE]; // buffer for one packet |
---|
2627 | |
---|
2628 | xptr_t queue_root_xp; // extended pointer on sockets list root |
---|
2629 | xptr_t queue_lock_xp; // extended pointer on lock protecting this list |
---|
2630 | xptr_t socket_xp; // extended pointer on on registered socket |
---|
2631 | socket_t * socket_ptr; |
---|
2632 | cxy_t socket_cxy; |
---|
2633 | xptr_t iter_xp; // iterator for loop on registered sockets |
---|
2634 | xlist_entry_t temp_root; // root of temporary list of sockets |
---|
2635 | xptr_t temp_root_xp; // extended pointer on temporary list of sockets |
---|
2636 | uint32_t temp_nr; // number of active registered sockets |
---|
2637 | bool_t cmd_valid; // TX command valid in socket descriptor |
---|
2638 | bool_t r2t_valid; // valid R2T request in socket descriptor |
---|
2639 | |
---|
2640 | thread_t * this = CURRENT_THREAD; |
---|
2641 | |
---|
2642 | #if DEBUG_DEV_NIC_TX |
---|
2643 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
2644 | uint32_t pid; |
---|
2645 | uint32_t fdid; |
---|
2646 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2647 | printk("\n[%s] thread[%x,%x] starts / cycle %d\n", |
---|
2648 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
2649 | #endif |
---|
2650 | |
---|
2651 | // check chdev direction and type |
---|
2652 | assert( (chdev->func == DEV_FUNC_NIC) && (chdev->is_rx == false) , |
---|
2653 | "illegal chdev type or direction" ); |
---|
2654 | |
---|
2655 | // check thread can yield |
---|
2656 | thread_assert_can_yield( this , __FUNCTION__ ); |
---|
2657 | |
---|
2658 | // build extended pointer on temporary list |
---|
2659 | temp_root_xp = XPTR( local_cxy , &temp_root ); |
---|
2660 | |
---|
2661 | // build extended pointer on client sockets queue (lock & root) |
---|
2662 | queue_lock_xp = XPTR( local_cxy , &chdev->wait_lock ); |
---|
2663 | queue_root_xp = XPTR( local_cxy , &chdev->wait_root ); |
---|
2664 | |
---|
2665 | while( 1 ) // TX server infinite loop |
---|
2666 | { |
---|
2667 | // initialize temporary list of registered sockets as empty |
---|
2668 | xlist_root_init( temp_root_xp ); |
---|
2669 | temp_nr = 0; |
---|
2670 | |
---|
2671 | // take the lock protecting the client sockets queue |
---|
2672 | remote_busylock_acquire( queue_lock_xp ); |
---|
2673 | |
---|
2674 | // build temporary list of all registered sockets |
---|
2675 | if( xlist_is_empty( queue_root_xp ) == false ) |
---|
2676 | { |
---|
2677 | XLIST_FOREACH( queue_root_xp , iter_xp ) |
---|
2678 | { |
---|
2679 | // get client socket cluster and local pointer |
---|
2680 | socket_xp = XLIST_ELEMENT( iter_xp , socket_t , tx_list ); |
---|
2681 | socket_ptr = GET_PTR( socket_xp ); |
---|
2682 | socket_cxy = GET_CXY( socket_xp ); |
---|
2683 | |
---|
2684 | // register socket in temporary list |
---|
2685 | xlist_add_last( temp_root_xp , XPTR( socket_cxy , &socket_ptr->tx_temp )); |
---|
2686 | temp_nr++; |
---|
2687 | } |
---|
2688 | } |
---|
2689 | |
---|
2690 | // release the lock protecting the client sockets queue |
---|
2691 | remote_busylock_release( queue_lock_xp ); |
---|
2692 | |
---|
2693 | if( temp_nr > 0 ) |
---|
2694 | { |
---|
2695 | // loop on temporary list |
---|
2696 | XLIST_FOREACH( temp_root_xp , iter_xp ) |
---|
2697 | { |
---|
2698 | // get client socket cluster and local pointer |
---|
2699 | socket_xp = XLIST_ELEMENT( iter_xp , socket_t , tx_temp ); |
---|
2700 | socket_ptr = GET_PTR( socket_xp ); |
---|
2701 | socket_cxy = GET_CXY( socket_xp ); |
---|
2702 | |
---|
2703 | // get cmd_valid & t2t_valid from socket descriptor |
---|
2704 | cmd_valid = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->tx_valid )); |
---|
2705 | |
---|
2706 | // get r2t_valid from socket descriptor |
---|
2707 | r2t_valid = (bool_t)remote_buf_status( XPTR( socket_cxy , &socket_ptr->r2tq )); |
---|
2708 | |
---|
2709 | // test if socket is active |
---|
2710 | if( cmd_valid || r2t_valid ) // active socket |
---|
2711 | { |
---|
2712 | |
---|
2713 | #if DEBUG_DEV_NIC_TX |
---|
2714 | cycle = (uint32_t)hal_get_cycles(); |
---|
2715 | pid = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->pid )); |
---|
2716 | fdid = hal_remote_l32( XPTR( socket_cxy , &socket_ptr->fdid )); |
---|
2717 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2718 | printk("\n[%s] thread[%x,%x] found socket[%x,%d] / cmd_valid %d / r2t_valid %d / cycle %d\n", |
---|
2719 | __FUNCTION__, this->process->pid, this->trdid, pid, fdid, cmd_valid, r2t_valid, cycle ); |
---|
2720 | #endif |
---|
2721 | // build and send one packet/segment for this socket |
---|
2722 | dev_nic_tx_build_packet( cmd_valid, |
---|
2723 | r2t_valid, |
---|
2724 | socket_xp, |
---|
2725 | k_buf, |
---|
2726 | chdev ); |
---|
2727 | #if DEBUG_DEV_NIC_TX |
---|
2728 | cycle = (uint32_t)hal_get_cycles(); |
---|
2729 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2730 | dev_nic_packet_display( true, // is_tx |
---|
2731 | this->process->pid, |
---|
2732 | this->trdid, |
---|
2733 | cycle, |
---|
2734 | k_buf ); |
---|
2735 | #endif |
---|
2736 | } |
---|
2737 | else // inactive socket |
---|
2738 | { |
---|
2739 | temp_nr--; |
---|
2740 | } |
---|
2741 | } // end loop on temporary list |
---|
2742 | } |
---|
2743 | |
---|
2744 | // block & deschedule if no active socket found in current iteration |
---|
2745 | if( temp_nr == 0 ) |
---|
2746 | { |
---|
2747 | |
---|
2748 | #if DEBUG_DEV_NIC_TX |
---|
2749 | cycle = (uint32_t)hal_get_cycles(); |
---|
2750 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2751 | printk("\n[%s] thread[%x,%x] no active socket => blocks on <CLIENT> / cycle %d\n", |
---|
2752 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
2753 | #endif |
---|
2754 | |
---|
2755 | // block and deschedule |
---|
2756 | thread_block( XPTR( local_cxy , this ) , THREAD_BLOCKED_CLIENT ); |
---|
2757 | sched_yield( "waiting client" ); |
---|
2758 | |
---|
2759 | #if DEBUG_DEV_NIC_TX |
---|
2760 | cycle = (uint32_t)hal_get_cycles(); |
---|
2761 | if( cycle > DEBUG_DEV_NIC_TX ) |
---|
2762 | printk("\n[%s] thread[%x,%x] resumes / cycle %d\n", |
---|
2763 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
2764 | #endif |
---|
2765 | } |
---|
2766 | } // end infinite while loop |
---|
2767 | } // end dev_nic_tx_server() |
---|
2768 | |
---|
2769 | |
---|
2770 | ///////////////////////////////////////////// |
---|
2771 | void dev_nic_packet_display( bool_t is_tx, |
---|
2772 | pid_t thread_pid, |
---|
2773 | trdid_t thread_trdid, |
---|
2774 | uint32_t cycle, |
---|
2775 | uint8_t * buf ) |
---|
2776 | { |
---|
2777 | // get ETH header fields |
---|
2778 | uint64_t eth_dst_mac = ((uint64_t)buf[5] << 40) | |
---|
2779 | ((uint64_t)buf[4] << 32) | |
---|
2780 | ((uint64_t)buf[3] << 24) | |
---|
2781 | ((uint64_t)buf[2] << 16) | |
---|
2782 | ((uint64_t)buf[1] << 8) | |
---|
2783 | ((uint64_t)buf[0] ) ; |
---|
2784 | |
---|
2785 | uint64_t eth_src_mac = ((uint64_t)buf[11] << 40) | |
---|
2786 | ((uint64_t)buf[10] << 32) | |
---|
2787 | ((uint64_t)buf[9] << 24) | |
---|
2788 | ((uint64_t)buf[8] << 16) | |
---|
2789 | ((uint64_t)buf[7] << 8) | |
---|
2790 | ((uint64_t)buf[6] ) ; |
---|
2791 | |
---|
2792 | uint16_t eth_length = ((uint16_t)buf[12] << 8) | |
---|
2793 | ((uint16_t)buf[13] ) ; |
---|
2794 | |
---|
2795 | // get IP header fields |
---|
2796 | uint8_t ip_version = buf[14]; |
---|
2797 | uint8_t ip_tos = buf[15]; |
---|
2798 | uint16_t ip_length = ((uint16_t)buf[16] << 8) | |
---|
2799 | ((uint16_t)buf[17] ) ; |
---|
2800 | |
---|
2801 | uint16_t ip_ident = ((uint16_t)buf[18] << 8) | |
---|
2802 | ((uint16_t)buf[19] ) ; |
---|
2803 | uint16_t ip_offset = ((uint16_t)buf[20] << 8) | |
---|
2804 | ((uint16_t)buf[21] ) ; |
---|
2805 | |
---|
2806 | uint8_t ip_ttl = buf[22]; |
---|
2807 | uint8_t ip_protocol = buf[23]; |
---|
2808 | uint16_t ip_checksum = ((uint16_t)buf[24] << 8) | |
---|
2809 | ((uint16_t)buf[25] ) ; |
---|
2810 | |
---|
2811 | uint32_t ip_src_addr = ((uint32_t)buf[26] << 24) | |
---|
2812 | ((uint32_t)buf[27] << 16) | |
---|
2813 | ((uint32_t)buf[28] << 8) | |
---|
2814 | ((uint32_t)buf[29] ) ; |
---|
2815 | |
---|
2816 | uint32_t ip_dst_addr = ((uint32_t)buf[30] << 24) | |
---|
2817 | ((uint32_t)buf[31] << 16) | |
---|
2818 | ((uint32_t)buf[32] << 8) | |
---|
2819 | ((uint32_t)buf[33] ) ; |
---|
2820 | |
---|
2821 | // get pointers on TXT0 chdev |
---|
2822 | xptr_t txt0_xp = chdev_dir.txt_tx[0]; |
---|
2823 | cxy_t txt0_cxy = GET_CXY( txt0_xp ); |
---|
2824 | chdev_t * txt0_ptr = GET_PTR( txt0_xp ); |
---|
2825 | |
---|
2826 | // get extended pointer on remote TXT0 chdev lock |
---|
2827 | xptr_t lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock ); |
---|
2828 | |
---|
2829 | // get TXT0 lock |
---|
2830 | remote_busylock_acquire( lock_xp ); |
---|
2831 | |
---|
2832 | if( is_tx ) |
---|
2833 | { |
---|
2834 | nolock_printk("\n*** NIC_TX server thread[%x,%x] send packet / cycle %d\n", |
---|
2835 | thread_pid, thread_trdid, cycle ); |
---|
2836 | } |
---|
2837 | else |
---|
2838 | { |
---|
2839 | nolock_printk("\n*** NIC_RX server thread[%x,%x] get packet / cycle %d\n", |
---|
2840 | thread_pid, thread_trdid, cycle ); |
---|
2841 | } |
---|
2842 | |
---|
2843 | nolock_printk("\n***** ETH header *****\n"); |
---|
2844 | nolock_printk(" - dst_mac [6] = %l\n" , eth_dst_mac ); |
---|
2845 | nolock_printk(" - src_mac [6] = %l\n" , eth_src_mac ); |
---|
2846 | nolock_printk(" - length [2] = %d\n" , (uint32_t)eth_length ); |
---|
2847 | nolock_printk("***** IP header *****\n"); |
---|
2848 | nolock_printk(" - version [1] = %x\n" , (uint32_t)ip_version ); |
---|
2849 | nolock_printk(" - tos [1] = %x\n" , (uint32_t)ip_tos ); |
---|
2850 | nolock_printk(" - length [2] = %d\n" , (uint32_t)ip_length ); |
---|
2851 | nolock_printk(" - ident [2] = %x\n" , (uint32_t)ip_ident ); |
---|
2852 | nolock_printk(" - offset [2] = %x\n" , (uint32_t)ip_offset ); |
---|
2853 | nolock_printk(" - ttl [1] = %x\n" , (uint32_t)ip_ttl ); |
---|
2854 | nolock_printk(" - protocol [1] = %x\n" , (uint32_t)ip_protocol ); |
---|
2855 | nolock_printk(" - checksum [2] = %x\n" , (uint32_t)ip_checksum ); |
---|
2856 | nolock_printk(" - src_addr [4] = %x\n" , (uint32_t)ip_src_addr ); |
---|
2857 | nolock_printk(" - dst_addr [4] = %x\n" , (uint32_t)ip_dst_addr ); |
---|
2858 | |
---|
2859 | // get UDP / TCP fields |
---|
2860 | if ( ip_protocol == PROTOCOL_UDP ) |
---|
2861 | { |
---|
2862 | uint16_t udp_src_port = ((uint16_t)buf[34] << 8) | |
---|
2863 | ((uint16_t)buf[35] ) ; |
---|
2864 | uint16_t udp_dst_port = ((uint16_t)buf[36] << 8) | |
---|
2865 | ((uint16_t)buf[37] ) ; |
---|
2866 | |
---|
2867 | nolock_printk("***** UDP header *****\n"); |
---|
2868 | nolock_printk(" - src_port [2] = %d\n" , (uint32_t)udp_src_port ); |
---|
2869 | nolock_printk(" - dst_port [2] = %d\n" , (uint32_t)udp_dst_port ); |
---|
2870 | } |
---|
2871 | else if( ip_protocol == PROTOCOL_TCP ) |
---|
2872 | { |
---|
2873 | uint16_t tcp_src_port = ((uint16_t)buf[34] << 8) | |
---|
2874 | ((uint16_t)buf[35] ) ; |
---|
2875 | uint16_t tcp_dst_port = ((uint16_t)buf[36] << 8) | |
---|
2876 | ((uint16_t)buf[37] ) ; |
---|
2877 | |
---|
2878 | uint32_t tcp_seq_num = ((uint32_t)buf[38] << 24) | |
---|
2879 | ((uint32_t)buf[39] << 16) | |
---|
2880 | ((uint32_t)buf[40] << 8) | |
---|
2881 | ((uint32_t)buf[41] ) ; |
---|
2882 | |
---|
2883 | uint32_t tcp_ack_num = ((uint32_t)buf[42] << 24) | |
---|
2884 | ((uint32_t)buf[43] << 16) | |
---|
2885 | ((uint32_t)buf[44] << 8) | |
---|
2886 | ((uint32_t)buf[45] ) ; |
---|
2887 | |
---|
2888 | uint8_t tcp_hlen = buf[46]; |
---|
2889 | uint8_t tcp_flags = buf[47]; |
---|
2890 | uint16_t tcp_window = ((uint16_t)buf[48] << 8) | |
---|
2891 | ((uint16_t)buf[49] ) ; |
---|
2892 | |
---|
2893 | uint16_t tcp_checksum = ((uint16_t)buf[50] << 8) | |
---|
2894 | ((uint16_t)buf[51] ) ; |
---|
2895 | uint16_t tcp_urgent = ((uint16_t)buf[52] << 8) | |
---|
2896 | ((uint16_t)buf[53] ) ; |
---|
2897 | |
---|
2898 | nolock_printk("***** TCP header *****\n"); |
---|
2899 | nolock_printk(" - src_port [2] = %x\n" , (uint32_t)tcp_src_port ); |
---|
2900 | nolock_printk(" - dst_port [2] = %x\n" , (uint32_t)tcp_dst_port ); |
---|
2901 | nolock_printk(" - seq_num [4] = %x\n" , (uint32_t)tcp_seq_num ); |
---|
2902 | nolock_printk(" - ack_num [4] = %x\n" , (uint32_t)tcp_ack_num ); |
---|
2903 | nolock_printk(" - hlen [1] = %d\n" , (uint32_t)tcp_hlen ); |
---|
2904 | nolock_printk(" - flags [1] = %x\n" , (uint32_t)tcp_flags ); |
---|
2905 | nolock_printk(" - window [2] = %x\n" , (uint32_t)tcp_window ); |
---|
2906 | nolock_printk(" - checksum [2] = %x\n" , (uint32_t)tcp_checksum ); |
---|
2907 | nolock_printk(" - urgent [2] = %x\n" , (uint32_t)tcp_urgent ); |
---|
2908 | } |
---|
2909 | else |
---|
2910 | { |
---|
2911 | nolock_printk("!!!!! undefined transport protocol !!!!!\n"); |
---|
2912 | } |
---|
2913 | |
---|
2914 | // release TXT0 lock |
---|
2915 | remote_busylock_release( lock_xp ); |
---|
2916 | |
---|
2917 | } // end dev_nic_packet_display() |
---|
2918 | |
---|