[1] | 1 | /* |
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| 2 | * dev_nic.c - NIC (Network Controler) generic device API implementation. |
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| 3 | * |
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[657] | 4 | * Author Alain Greiner (2016,2017,2018,2019,2020) |
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[1] | 5 | * |
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| 6 | * Copyright (c) UPMC Sorbonne Universites |
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| 7 | * |
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| 8 | * This file is part of ALMOS-MKH. |
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| 9 | * |
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| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 11 | * under the terms of the GNU General Public License as published by |
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| 12 | * the Free Software Foundation; version 2.0 of the License. |
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| 13 | * |
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| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 17 | * General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 22 | */ |
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| 23 | |
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[457] | 24 | #include <hal_kernel_types.h> |
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[1] | 25 | #include <hal_special.h> |
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[657] | 26 | #include <hal_uspace.h> |
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| 27 | #include <remote_buf.h> |
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[1] | 28 | #include <printk.h> |
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[3] | 29 | #include <chdev.h> |
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[1] | 30 | #include <thread.h> |
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[657] | 31 | #include <socket.h> |
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[259] | 32 | #include <hal_drivers.h> |
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[1] | 33 | #include <dev_nic.h> |
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[657] | 34 | #include <vfs.h> |
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| 35 | #include <shared_socket.h> |
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[1] | 36 | |
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| 37 | ///////////////////////////////////////////////////////////////////////////////////////// |
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[657] | 38 | // Extern global variables |
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[1] | 39 | ///////////////////////////////////////////////////////////////////////////////////////// |
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| 40 | |
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[3] | 41 | extern chdev_directory_t chdev_dir; // allocated in kernel_init.c |
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[1] | 42 | |
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[657] | 43 | //////////////////////////////////////////////////////////////////////////////////////////// |
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| 44 | // This static function is used by the dev_nic_rx_handle_tcp() & dev_nic_tx_handle_tcp() |
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| 45 | // functions to check acceptability of a given sequence number. It returns true when |
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| 46 | // the <seq> argument is contained in a wrap-around window defined by the <min> and <max> |
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| 47 | // arguments. The window wrap-around when (min > max). |
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| 48 | //////////////////////////////////////////////////////////////////////////////////////////// |
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| 49 | // @ seq : [in] value to be checked. |
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| 50 | // @ min : [in] first base. |
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| 51 | // @ max : [in] window size. |
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| 52 | //////////////////////////////////////////////////////////////////////////////////////////// |
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| 53 | static inline bool_t is_in_window( uint32_t seq, |
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| 54 | uint32_t min, |
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| 55 | uint32_t max ) |
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| 56 | { |
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| 57 | if( max >= min ) // no wrap_around => only one window [min,max] |
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| 58 | { |
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| 59 | return( (seq >= min) && (seq <= max) ); |
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| 60 | } |
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| 61 | else // window wrap-around => two windows [min,0xFFFFFFFF] and [0,max] |
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| 62 | { |
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| 63 | return( (seq <= max) || (seq >= min) ); |
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| 64 | } |
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| 65 | } |
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| 66 | |
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| 67 | //////////////////////////////////////////////////////////////////////////////////////////// |
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| 68 | // this static function compute a channel index in range [0,nic_channelx[ from |
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| 69 | // a remote IP address and remote port. |
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| 70 | // TODO this function should be provided by the NIC driver. |
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| 71 | //////////////////////////////////////////////////////////////////////////////////////////// |
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| 72 | // @ addr : [in] IP address. |
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| 73 | // @ port : [in] TCP/UDP port. |
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| 74 | //////////////////////////////////////////////////////////////////////////////////////////// |
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| 75 | static inline uint32_t dev_nic_channel_index( uint32_t addr, |
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| 76 | uint16_t port ) |
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| 77 | { |
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| 78 | // get number of NIC channels |
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| 79 | uint32_t nic_channels = LOCAL_CLUSTER->nb_nic_channels; |
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| 80 | |
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| 81 | // compute NIC channel index |
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| 82 | return ( ((addr ) & 0xFF) ^ |
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| 83 | ((addr > 8 ) & 0xFF) ^ |
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| 84 | ((addr > 16) & 0xFF) ^ |
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| 85 | ((addr > 24) & 0xFF) ^ |
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| 86 | ((port ) & 0xFF) ^ |
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| 87 | ((port > 8 ) & 0xFF) ) % nic_channels; |
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| 88 | } |
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| 89 | |
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| 90 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 91 | // This static function computes the checksum for an IP packet header. |
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| 92 | // The "checksum" field itself is not taken into account for this computation. |
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| 93 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 94 | // @ buffer : [in] pointer on IP packet header (20 bytes) |
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| 95 | // @ return the checksum value on 16 bits |
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| 96 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 97 | uint16_t dev_nic_ip_checksum( uint8_t * buffer ) |
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| 98 | { |
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| 99 | uint32_t i; |
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| 100 | uint32_t cs; // 32 bits accumulator |
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| 101 | uint16_t * buf; |
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| 102 | |
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| 103 | buf = (uint16_t *)buffer; |
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| 104 | |
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| 105 | // compute checksum |
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| 106 | for( i = 0 , cs = 0 ; i < 10 ; i++ ) |
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| 107 | { |
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| 108 | if( i != 5 ) cs += buf[i]; |
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| 109 | } |
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| 110 | |
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| 111 | // one's complement |
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| 112 | return ~cs; |
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| 113 | } |
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| 114 | |
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| 115 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 116 | // This static function computes the checksum for an UDP packet defined by |
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| 117 | // the <buffer> and <size> arguments. |
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| 118 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 119 | // @ buffer : [in] pointer on UDP packet base. |
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| 120 | // @ size : [in] number of bytes in this packet (including header). |
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| 121 | // @ return the checksum value on 16 bits |
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| 122 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 123 | uint16_t dev_nic_udp_checksum( uint8_t * buffer, |
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| 124 | uint32_t size ) |
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| 125 | { |
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| 126 | uint32_t i; |
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| 127 | uint32_t carry; |
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| 128 | uint32_t cs; // 32 bits accumulator |
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| 129 | uint16_t * buf; |
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| 130 | uint32_t max; // number of uint16_t in packet |
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| 131 | |
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| 132 | // compute max & buf |
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| 133 | buf = (uint16_t *)buffer; |
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| 134 | max = size >> 1; |
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| 135 | |
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| 136 | // extend buffer[] if required |
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| 137 | if( size & 1 ) |
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| 138 | { |
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| 139 | max++; |
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| 140 | buffer[size] = 0; |
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| 141 | } |
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| 142 | |
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| 143 | // compute checksum for UDP packet |
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| 144 | for( i = 0 , cs = 0 ; i < size ; i++ ) cs += buf[i]; |
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| 145 | |
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| 146 | // handle carry |
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| 147 | carry = (cs >> 16); |
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| 148 | if( carry ) |
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| 149 | { |
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| 150 | cs += carry; |
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| 151 | carry = (cs >> 16); |
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| 152 | if( carry ) cs += carry; |
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| 153 | } |
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| 154 | |
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| 155 | // one's complement |
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| 156 | return ~cs; |
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| 157 | } |
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| 158 | |
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| 159 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 160 | // This static function computes the checksum for a TCP segment defined by |
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| 161 | // the <buffer> and <size> arguments. |
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| 162 | // It includes the pseudo header defined by the <src_ip_addr>, <dst_ip_addr>, |
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| 163 | // <size> arguments, and by the TCP_PROTOCOL code. |
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| 164 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 165 | // @ buffer : [in] pointer on TCP segment base. |
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| 166 | // @ size : [in] number of bytes in this segment (including header). |
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| 167 | // @ src_ip_addr : [in] source IP address (pseudo header) |
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| 168 | // @ dst_ip_addr : [in] destination IP address (pseudo header) |
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| 169 | // @ return the checksum value on 16 bits |
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| 170 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 171 | uint16_t dev_nic_tcp_checksum( uint8_t * buffer, |
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| 172 | uint32_t size, |
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| 173 | uint32_t src_ip_addr, |
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| 174 | uint32_t dst_ip_addr ) |
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| 175 | { |
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| 176 | uint32_t i; |
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| 177 | uint32_t carry; |
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| 178 | uint32_t cs; // 32 bits accumulator |
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| 179 | uint16_t * buf; |
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| 180 | uint32_t max; // number of uint16_t in segment |
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| 181 | |
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| 182 | // compute max & buf |
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| 183 | buf = (uint16_t *)buffer; |
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| 184 | max = size >> 1; |
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| 185 | |
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| 186 | // extend buffer[] if required |
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| 187 | if( size & 1 ) |
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| 188 | { |
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| 189 | max++; |
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| 190 | buffer[size] = 0; |
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| 191 | } |
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| 192 | |
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| 193 | // compute checksum for TCP segment |
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| 194 | for( i = 0 , cs = 0 ; i < size ; i++ ) cs += buf[i]; |
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| 195 | |
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| 196 | // complete checksum for pseudo-header |
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| 197 | cs += src_ip_addr; |
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| 198 | cs += dst_ip_addr; |
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| 199 | cs += PROTOCOL_TCP; |
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| 200 | cs += size; |
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| 201 | |
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| 202 | // handle carry |
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| 203 | carry = (cs >> 16); |
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| 204 | if( carry ) |
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| 205 | { |
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| 206 | cs += carry; |
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| 207 | carry = (cs >> 16); |
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| 208 | if( carry ) cs += carry; |
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| 209 | } |
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| 210 | |
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| 211 | // one's complement |
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| 212 | return ~cs; |
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| 213 | } |
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| 214 | |
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[188] | 215 | ////////////////////////////////// |
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| 216 | void dev_nic_init( chdev_t * nic ) |
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[1] | 217 | { |
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[647] | 218 | // get "channel" & "is_rx" fields from chdev descriptor |
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[188] | 219 | uint32_t channel = nic->channel; |
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| 220 | bool_t is_rx = nic->is_rx; |
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[1] | 221 | |
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[23] | 222 | // set chdev name |
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[407] | 223 | if( is_rx ) snprintf( nic->name , 16 , "nic%d_rx" , channel ); |
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| 224 | else snprintf( nic->name , 16 , "nic%d_tx" , channel ); |
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[23] | 225 | |
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[259] | 226 | // call driver init function |
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[647] | 227 | hal_drivers_nic_init( nic ); |
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[1] | 228 | |
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[188] | 229 | // select a core to execute the NIC server thread |
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[637] | 230 | lid_t lid = cluster_select_local_core( local_cxy ); |
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[1] | 231 | |
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[188] | 232 | // bind the NIC IRQ to the selected core |
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| 233 | // but does NOT enable it |
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| 234 | dev_pic_bind_irq( lid , nic ); |
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[3] | 235 | |
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[1] | 236 | // create server thread |
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[3] | 237 | thread_t * new_thread; |
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[1] | 238 | error_t error; |
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| 239 | |
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[3] | 240 | error = thread_kernel_create( &new_thread, |
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| 241 | THREAD_DEV, |
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[619] | 242 | &chdev_server_func, |
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[188] | 243 | nic, |
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[3] | 244 | lid ); |
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[1] | 245 | |
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[492] | 246 | assert( (error == 0) , "cannot create server thread" ); |
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[1] | 247 | |
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[3] | 248 | // set "server" field in chdev descriptor |
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[188] | 249 | nic->server = new_thread; |
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[1] | 250 | |
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[408] | 251 | // set "chdev" field in thread descriptor |
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| 252 | new_thread->chdev = nic; |
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| 253 | |
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| 254 | // unblock server thread |
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[3] | 255 | thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL ); |
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[1] | 256 | |
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| 257 | } // end dev_nic_init() |
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| 258 | |
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[657] | 259 | |
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| 260 | ///////////////////////////////////////////////////////////////////////////////////////// |
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| 261 | // Functions implementing the SOCKET related syscalls |
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| 262 | ///////////////////////////////////////////////////////////////////////////////////////// |
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| 263 | |
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| 264 | ////////////////////////////////////// |
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| 265 | int dev_nic_socket( uint32_t domain, |
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| 266 | uint32_t type ) |
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| 267 | { |
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| 268 | uint32_t fdid; |
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| 269 | socket_t * socket; |
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| 270 | error_t error; |
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| 271 | |
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| 272 | // allocate memory for the file descriptor and for the socket |
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| 273 | error = socket_create( local_cxy, |
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| 274 | domain, |
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| 275 | type, |
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| 276 | &socket, // unused here |
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| 277 | &fdid ); |
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| 278 | |
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| 279 | if( error ) return -1; |
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| 280 | return fdid; |
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| 281 | } |
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| 282 | |
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| 283 | //////////////////////////////// |
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| 284 | int dev_nic_bind( uint32_t fdid, |
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| 285 | uint32_t addr, |
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| 286 | uint16_t port ) |
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| 287 | { |
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| 288 | vfs_inode_type_t type; |
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| 289 | socket_t * socket; |
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| 290 | uint32_t state; |
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| 291 | |
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| 292 | thread_t * this = CURRENT_THREAD; |
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| 293 | process_t * process = this->process; |
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| 294 | |
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| 295 | // get pointers on file descriptor |
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| 296 | xptr_t file_xp = process_fd_get_xptr( process , fdid ); |
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| 297 | vfs_file_t * file_ptr = GET_PTR( file_xp ); |
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| 298 | cxy_t file_cxy = GET_CXY( file_xp ); |
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| 299 | |
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| 300 | // check file_xp |
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| 301 | if( file_xp == XPTR_NULL ) |
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| 302 | { |
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| 303 | printk("\n[ERROR] in %s : undefined fdid %d", |
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| 304 | __FUNCTION__, fdid ); |
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| 305 | return -1; |
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| 306 | } |
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| 307 | |
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| 308 | type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) ); |
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| 309 | socket = hal_remote_lpt( XPTR( file_cxy , &file_ptr->socket ) ); |
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| 310 | |
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| 311 | // check file descriptor type |
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| 312 | if( type != INODE_TYPE_SOCK ) |
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| 313 | { |
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| 314 | printk("\n[ERROR] in %s : illegal file type %s", |
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| 315 | __FUNCTION__, vfs_inode_type_str( type ) ); |
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| 316 | return -1; |
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| 317 | } |
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| 318 | |
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| 319 | state = (type == SOCK_STREAM) ? TCP_STATE_BOUND : UDP_STATE_BOUND; |
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| 320 | |
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| 321 | // update the socket descriptor |
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| 322 | hal_remote_s32( XPTR( file_cxy , &socket->local_addr ) , addr ); |
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| 323 | hal_remote_s32( XPTR( file_cxy , &socket->local_port ) , port ); |
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| 324 | hal_remote_s32( XPTR( file_cxy , &socket->state ) , state ); |
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| 325 | |
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| 326 | return 0; |
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| 327 | |
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| 328 | } // end dev_nic_bind() |
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| 329 | |
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| 330 | ////////////////////////////////// |
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| 331 | int dev_nic_listen( uint32_t fdid, |
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| 332 | uint32_t max_pending ) |
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| 333 | { |
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| 334 | xptr_t file_xp; |
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| 335 | vfs_file_t * file_ptr; |
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| 336 | cxy_t file_cxy; |
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| 337 | vfs_inode_type_t file_type; |
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| 338 | socket_t * socket_ptr; |
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| 339 | uint32_t socket_type; |
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| 340 | uint32_t socket_state; |
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| 341 | |
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| 342 | thread_t * this = CURRENT_THREAD; |
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| 343 | process_t * process = this->process; |
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| 344 | |
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| 345 | if( max_pending != 0 ) |
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| 346 | { |
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| 347 | printk("\n[WARNING] in %s : max_pending argument non supported\n", |
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| 348 | __FUNCTION__ ); |
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| 349 | } |
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| 350 | |
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| 351 | // get pointers on file descriptor |
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| 352 | file_xp = process_fd_get_xptr( process , fdid ); |
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| 353 | file_ptr = GET_PTR( file_xp ); |
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| 354 | file_cxy = GET_CXY( file_xp ); |
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| 355 | |
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| 356 | // check file_xp |
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| 357 | if( file_xp == XPTR_NULL ) |
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| 358 | { |
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| 359 | printk("\n[ERROR] in %s : undefined fdid %d", |
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| 360 | __FUNCTION__, fdid ); |
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| 361 | return -1; |
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| 362 | } |
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| 363 | |
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| 364 | file_type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) ); |
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| 365 | socket_ptr = hal_remote_lpt( XPTR( file_cxy , &file_ptr->socket ) ); |
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| 366 | |
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| 367 | // check file descriptor type |
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| 368 | if( file_type != INODE_TYPE_SOCK ) |
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| 369 | { |
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| 370 | printk("\n[ERROR] in %s : illegal file type %s", |
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| 371 | __FUNCTION__, vfs_inode_type_str(file_type) ); |
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| 372 | return -1; |
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| 373 | } |
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| 374 | |
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| 375 | // get socket type and state |
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| 376 | socket_type = hal_remote_l32( XPTR( file_cxy , &socket_ptr->type )); |
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| 377 | socket_state = hal_remote_l32( XPTR( file_cxy , &socket_ptr->state )); |
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| 378 | |
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| 379 | // check socket type |
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| 380 | if( socket_type != SOCK_STREAM ) |
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| 381 | { |
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| 382 | printk("\n[ERROR] in %s : illegal socket type", |
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| 383 | __FUNCTION__ ); |
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| 384 | return -1; |
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| 385 | } |
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| 386 | |
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| 387 | // check socket state |
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| 388 | if( socket_state != TCP_STATE_BOUND ) |
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| 389 | { |
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| 390 | printk("\n[ERROR] in %s : illegal socket state %s", |
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| 391 | __FUNCTION__, socket_state_str(socket_state) ); |
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| 392 | return -1; |
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| 393 | } |
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| 394 | |
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| 395 | // update socket.state |
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| 396 | hal_remote_s32( XPTR( file_cxy , &socket_ptr->state ) , TCP_STATE_LISTEN ); |
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| 397 | |
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| 398 | return 0; |
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| 399 | |
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| 400 | } // end dev_nic_listen() |
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| 401 | |
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[1] | 402 | /////////////////////////////////// |
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[657] | 403 | int dev_nic_connect( uint32_t fdid, |
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| 404 | uint32_t remote_addr, |
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| 405 | uint16_t remote_port ) |
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[1] | 406 | { |
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[657] | 407 | vfs_inode_type_t file_type; |
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| 408 | socket_t * socket; |
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| 409 | uint32_t socket_state; // socket state |
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| 410 | uint32_t socket_type; // socket type |
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| 411 | uint32_t local_addr; // local IP address |
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| 412 | uint32_t local_port; // local port |
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| 413 | xptr_t tx_server_xp; // extended pointer on TX server thread |
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| 414 | thread_t * tx_server_ptr; // local pointer on TX server thread |
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[1] | 415 | |
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[657] | 416 | thread_t * this = CURRENT_THREAD; |
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| 417 | process_t * process = this->process; |
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[1] | 418 | |
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[657] | 419 | // get pointers on file descriptor |
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| 420 | xptr_t file_xp = process_fd_get_xptr( process , fdid ); |
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| 421 | vfs_file_t * file_ptr = GET_PTR( file_xp ); |
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| 422 | cxy_t file_cxy = GET_CXY( file_xp ); |
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[1] | 423 | |
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[657] | 424 | // check file_xp |
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| 425 | if( file_xp == XPTR_NULL ) |
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| 426 | { |
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| 427 | printk("\n[ERROR] in %s : undefined fdid %d", |
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| 428 | __FUNCTION__, fdid ); |
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| 429 | return -1; |
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| 430 | } |
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[565] | 431 | |
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[657] | 432 | file_type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) ); |
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| 433 | socket = hal_remote_lpt( XPTR( file_cxy , &file_ptr->socket ) ); |
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| 434 | |
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| 435 | // check file descriptor type |
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| 436 | if( file_type != INODE_TYPE_SOCK ) |
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| 437 | { |
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| 438 | printk("\n[ERROR] in %s : illegal file type %s", |
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| 439 | __FUNCTION__, vfs_inode_type_str( file_type ) ); |
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| 440 | return -1; |
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| 441 | } |
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| 442 | |
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| 443 | // get relevant socket infos |
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| 444 | socket_type = hal_remote_l32( XPTR( file_cxy , &socket->type ) ); |
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| 445 | socket_state = hal_remote_l32( XPTR( file_cxy , &socket->state ) ); |
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| 446 | local_addr = hal_remote_l32( XPTR( file_cxy , &socket->local_addr ) ); |
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| 447 | local_port = hal_remote_l32( XPTR( file_cxy , &socket->local_port ) ); |
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| 448 | |
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| 449 | if( socket_type == SOCK_DGRAM ) // UDP |
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| 450 | { |
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| 451 | if( socket_state != UDP_STATE_BOUND ) |
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| 452 | { |
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| 453 | printk("\n[ERROR] in %s : illegal socket statea %s for CONNECT", |
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| 454 | __FUNCTION__, socket_state_str(socket_state) ); |
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| 455 | return -1; |
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| 456 | } |
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| 457 | } |
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| 458 | else if( socket_type == SOCK_STREAM ) // TCP |
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| 459 | { |
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| 460 | if( socket_state != TCP_STATE_BOUND ) |
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| 461 | { |
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| 462 | printk("\n[ERROR] in %s : illegal socket state %s for CONNECT", |
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| 463 | __FUNCTION__, socket_state_str(socket_state) ); |
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| 464 | return -1; |
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| 465 | } |
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| 466 | } |
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| 467 | else |
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| 468 | { |
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| 469 | printk("\n[ERROR] in %s : illegal socket type %d for CONNECT", |
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| 470 | __FUNCTION__, socket_type ); |
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| 471 | return -1; |
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| 472 | } |
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| 473 | |
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| 474 | // compute nic_channel index from remote_addr and remote_port |
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| 475 | uint32_t nic_channel = dev_nic_channel_index( remote_addr , remote_port ); |
---|
| 476 | |
---|
| 477 | // link new socket to chdev servers |
---|
| 478 | socket_link_to_servers( XPTR( file_cxy , socket ), |
---|
| 479 | nic_channel ); |
---|
| 480 | |
---|
| 481 | // update the socket descriptor |
---|
| 482 | hal_remote_s32( XPTR( file_cxy , &socket->remote_addr ) , remote_addr ); |
---|
| 483 | hal_remote_s32( XPTR( file_cxy , &socket->remote_port ) , remote_port ); |
---|
| 484 | hal_remote_s32( XPTR( file_cxy , &socket->nic_channel ) , nic_channel ); |
---|
| 485 | |
---|
| 486 | // the actual connection mechanism depends on socket type |
---|
| 487 | // UDP : client thread directly updates the local socket state |
---|
| 488 | // TCP : client thread request TX server thread to start the 3 steps handshake |
---|
| 489 | |
---|
| 490 | if( socket_type == SOCK_DGRAM ) // UDP |
---|
| 491 | { |
---|
| 492 | // directly update the local socket state |
---|
| 493 | hal_remote_s32( XPTR( file_cxy , &socket->state ) , UDP_STATE_CONNECT ); |
---|
| 494 | } |
---|
| 495 | else // TCP |
---|
| 496 | { |
---|
| 497 | // get pointers on NIC_TX[index] chdev |
---|
| 498 | xptr_t tx_chdev_xp = chdev_dir.nic_tx[nic_channel]; |
---|
| 499 | chdev_t * tx_chdev_ptr = GET_PTR( tx_chdev_xp ); |
---|
| 500 | cxy_t tx_chdev_cxy = GET_CXY( tx_chdev_xp ); |
---|
| 501 | |
---|
| 502 | // get pointers on NIC_TX[channel] server thread |
---|
| 503 | tx_server_ptr = hal_remote_lpt( XPTR( tx_chdev_cxy , &tx_chdev_ptr->server )); |
---|
| 504 | tx_server_xp = XPTR( tx_chdev_cxy , tx_server_ptr ); |
---|
| 505 | |
---|
| 506 | // register command arguments in socket descriptor |
---|
| 507 | hal_remote_s64( XPTR( file_cxy , &socket->tx_cmd ), |
---|
| 508 | SOCKET_TX_CONNECT ); |
---|
| 509 | |
---|
| 510 | // update the "tx_client" field in socket descriptor |
---|
| 511 | hal_remote_s64( XPTR( file_cxy , &socket->tx_client ), |
---|
| 512 | XPTR( local_cxy , this ) ); |
---|
| 513 | |
---|
| 514 | // unblock NIC_TX server thread |
---|
| 515 | thread_unblock( tx_server_xp , THREAD_BLOCKED_CLIENT ); |
---|
| 516 | |
---|
| 517 | // block on THREAD_BLOCKED_IO condition and deschedules |
---|
| 518 | thread_block( XPTR( local_cxy , this ) , THREAD_BLOCKED_IO ); |
---|
| 519 | sched_yield( "blocked in connect" ); |
---|
| 520 | |
---|
| 521 | // reset the "tx_client" field in socket descriptor |
---|
| 522 | hal_remote_s64( XPTR( file_cxy , &socket->tx_client ), |
---|
| 523 | XPTR_NULL ); |
---|
| 524 | } |
---|
| 525 | |
---|
| 526 | return 0; |
---|
| 527 | |
---|
| 528 | } // end dev_nic_connect() |
---|
| 529 | |
---|
| 530 | //////////////////////////////////// |
---|
| 531 | int dev_nic_accept( uint32_t fdid, |
---|
| 532 | uint32_t * remote_addr, |
---|
| 533 | uint16_t * remote_port ) |
---|
| 534 | { |
---|
| 535 | xptr_t file_xp; // extended pointer on remote file |
---|
| 536 | vfs_file_t * file_ptr; |
---|
| 537 | cxy_t file_cxy; |
---|
| 538 | vfs_inode_type_t file_type; // file descriptor type |
---|
| 539 | socket_t * socket; // local pointer on remote waiting socket |
---|
| 540 | uint32_t socket_type; // waiting socket type |
---|
| 541 | uint32_t socket_state; // waiting socket state |
---|
| 542 | uint32_t socket_domain; // waiting socket domain |
---|
| 543 | uint32_t socket_local_addr; // waiting socket local IP address |
---|
| 544 | uint32_t socket_local_port; // waiting socket local port |
---|
| 545 | xptr_t crqq_xp; // extended pointer on socket.crqq queue |
---|
| 546 | socket_t * new_socket; // local pointer on new socket |
---|
| 547 | uint32_t new_fdid; // new socket file descriptor index |
---|
| 548 | sockaddr_t new_sockaddr; // one request in crqq queue |
---|
| 549 | uint32_t new_remote_addr; // new socket remote IP address |
---|
| 550 | uint32_t new_remote_port; // new socket remote port |
---|
| 551 | error_t error; |
---|
| 552 | |
---|
| 553 | thread_t * this = CURRENT_THREAD; |
---|
| 554 | process_t * process = this->process; |
---|
| 555 | |
---|
| 556 | // get pointers on file descriptor |
---|
| 557 | file_xp = process_fd_get_xptr( process , fdid ); |
---|
| 558 | file_ptr = GET_PTR( file_xp ); |
---|
| 559 | file_cxy = GET_CXY( file_xp ); |
---|
| 560 | |
---|
| 561 | // check file_xp |
---|
| 562 | if( file_xp == XPTR_NULL ) |
---|
| 563 | { |
---|
| 564 | printk("\n[ERROR] in %s : undefined fdid %d", |
---|
| 565 | __FUNCTION__, fdid ); |
---|
| 566 | return -1; |
---|
| 567 | } |
---|
| 568 | |
---|
| 569 | file_type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) ); |
---|
| 570 | socket = hal_remote_lpt( XPTR( file_cxy , &file_ptr->socket ) ); |
---|
| 571 | |
---|
| 572 | // check file descriptor type |
---|
| 573 | if( file_type != INODE_TYPE_SOCK ) |
---|
| 574 | { |
---|
| 575 | printk("\n[ERROR] in %s : illegal file type %s / thread[%x,%x]\n", |
---|
| 576 | __FUNCTION__, vfs_inode_type_str(file_type), process->pid, this->trdid ); |
---|
| 577 | return -1; |
---|
| 578 | } |
---|
| 579 | |
---|
| 580 | // get socket type, domain, state, local_addr and local_port |
---|
| 581 | socket_type = hal_remote_l32( XPTR( file_cxy , &socket->type )); |
---|
| 582 | socket_state = hal_remote_l32( XPTR( file_cxy , &socket->state )); |
---|
| 583 | socket_domain = hal_remote_l32( XPTR( file_cxy , &socket->domain )); |
---|
| 584 | socket_local_addr = hal_remote_l32( XPTR( file_cxy , &socket->local_addr )); |
---|
| 585 | socket_local_port = hal_remote_l32( XPTR( file_cxy , &socket->local_port )); |
---|
| 586 | |
---|
| 587 | // check socket type |
---|
| 588 | if( socket_type != SOCK_STREAM ) |
---|
| 589 | { |
---|
| 590 | printk("\n[ERROR] in %s : illegal socket type / thread[%x,%x]\n", |
---|
| 591 | __FUNCTION__, process->pid , this->trdid ); |
---|
| 592 | return -1; |
---|
| 593 | } |
---|
| 594 | |
---|
| 595 | // check socket state |
---|
| 596 | if( socket_state != TCP_STATE_LISTEN ) |
---|
| 597 | { |
---|
| 598 | printk("\n[ERROR] in %s : illegal socket state %s / thread[%x,%x]\n", |
---|
| 599 | __FUNCTION__, socket_state_str(socket_state), process->pid, this->trdid ); |
---|
| 600 | return -1; |
---|
| 601 | } |
---|
| 602 | |
---|
| 603 | // select a cluster for the new socket |
---|
| 604 | cxy_t new_cxy = cluster_random_select(); |
---|
| 605 | |
---|
| 606 | // allocate memory for the new socket descriptor |
---|
| 607 | error = socket_create( new_cxy, |
---|
| 608 | socket_domain, |
---|
| 609 | socket_type, |
---|
| 610 | &new_socket, |
---|
| 611 | &new_fdid ); |
---|
| 612 | if( error ) |
---|
| 613 | { |
---|
| 614 | printk("\n[ERROR] in %s : cannot allocate new socket / thread[%x,%x]\n", |
---|
| 615 | __FUNCTION__, process->pid, this->trdid ); |
---|
| 616 | return -1; |
---|
| 617 | } |
---|
| 618 | |
---|
| 619 | // build extended pointer on socket.crqq |
---|
| 620 | crqq_xp = XPTR( file_cxy , &socket->crqq ); |
---|
| 621 | |
---|
| 622 | // blocks and deschedules if requests queue empty |
---|
| 623 | if( remote_buf_status( crqq_xp ) == 0 ) |
---|
| 624 | { |
---|
| 625 | thread_block( XPTR( local_cxy , this ) , THREAD_BLOCKED_IO ); |
---|
| 626 | sched_yield( "socket.crqq queue empty"); |
---|
| 627 | } |
---|
| 628 | |
---|
| 629 | // extract first request from the socket.crqq queue |
---|
| 630 | remote_buf_get_to_kernel( crqq_xp, |
---|
| 631 | (uint8_t *)(&new_sockaddr), |
---|
| 632 | sizeof(sockaddr_t) ); |
---|
| 633 | |
---|
| 634 | new_remote_addr = new_sockaddr.s_addr; |
---|
| 635 | new_remote_port = new_sockaddr.s_port; |
---|
| 636 | |
---|
| 637 | // compute NIC channel index from remote_addr and remote_port |
---|
| 638 | uint32_t nic_channel = dev_nic_channel_index( new_remote_addr , new_remote_port ); |
---|
| 639 | |
---|
| 640 | // update new socket descriptor |
---|
| 641 | new_socket->local_addr = hal_remote_l32(XPTR( file_cxy , &socket->local_addr )); |
---|
| 642 | new_socket->local_port = hal_remote_l32(XPTR( file_cxy , &socket->local_port )); |
---|
| 643 | new_socket->remote_addr = new_remote_addr; |
---|
| 644 | new_socket->remote_port = new_remote_port; |
---|
| 645 | new_socket->nic_channel = nic_channel; |
---|
| 646 | |
---|
| 647 | // link new socket to chdev servers |
---|
| 648 | socket_link_to_servers( XPTR( new_cxy , new_socket ), |
---|
| 649 | nic_channel ); |
---|
| 650 | // return success |
---|
| 651 | *remote_addr = new_remote_addr; |
---|
| 652 | *remote_port = new_remote_port; |
---|
| 653 | |
---|
| 654 | return new_fdid; |
---|
| 655 | |
---|
| 656 | } // end dev_nic_accept() |
---|
| 657 | |
---|
| 658 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 659 | // This static and blocking function is called by the four functions : |
---|
| 660 | // dev_nic_send() / dev_nic_recv() / dev_nic_sendto() / dev_nic_recvfrom(). |
---|
| 661 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 662 | // Implementation note |
---|
| 663 | // The behavior is very different for SEND & RECV : |
---|
| 664 | // - For a SEND, the client thread checks that there is no TX command registered |
---|
| 665 | // in the socket. It registers the command arguments in the socket descriptor |
---|
| 666 | // (tx_client, tx_cmd, tx_buf, tx_len). Then the client thread unblocks the |
---|
| 667 | // TX server thread from the BLOCKED_CLIENT condition, blocks itself on the |
---|
| 668 | // BLOCKED_IO condition, and deschedules. It is unblocked by the TX server thread |
---|
| 669 | // when the last byte has been sent (for UDP) or acknowledged (for TCP). |
---|
| 670 | // When the client thread resumes, it reset the command in socket, and returns. |
---|
| 671 | // - For a RECV, the client thread checks that there is no RX command registered |
---|
| 672 | // in the socket. It registers itself in socket (rx_client). It checks the status |
---|
| 673 | // of the receive buffer. It the rx_buf is empty, it blocks on the BLOCKED_IO |
---|
| 674 | // condition, and deschedules. It is unblocked by the RX server thread when an UDP |
---|
| 675 | // packet or TCP segment has been writen in the rx_buf. When it resumes, it moves |
---|
| 676 | // the available data from the rx_buf to the user buffer, reset its registration |
---|
| 677 | // in socket (reset the rx_buf for an UDP socket), and returns. |
---|
| 678 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 679 | int dev_nic_register_cmd( bool_t is_send, |
---|
| 680 | uint32_t fdid, |
---|
| 681 | uint8_t * u_buf, |
---|
| 682 | uint32_t length, |
---|
| 683 | bool_t explicit, |
---|
| 684 | uint32_t explicit_addr, |
---|
| 685 | uint32_t explicit_port ) |
---|
| 686 | { |
---|
| 687 | vfs_inode_type_t file_type; // file descriptor type |
---|
| 688 | socket_t * socket_ptr; // local pointer on socket descriptor |
---|
| 689 | uint32_t socket_state; // current socket state |
---|
| 690 | uint32_t socket_type; // socket type (UDP/TCP) |
---|
| 691 | uint32_t nic_channel; // NIC channel for this socket |
---|
| 692 | xptr_t socket_lock_xp; // extended pointer on socket lock |
---|
| 693 | xptr_t file_xp; // extended pointer on file descriptor |
---|
| 694 | vfs_file_t * file_ptr; |
---|
| 695 | cxy_t file_cxy; |
---|
| 696 | xptr_t chdev_xp; // extended pointer on NIC_TX[channel] chdev |
---|
| 697 | chdev_t * chdev_ptr; |
---|
| 698 | cxy_t chdev_cxy; |
---|
| 699 | uint32_t remote_addr; |
---|
| 700 | uint32_t remote_port; |
---|
| 701 | uint32_t status; // number of bytes in rx_buf |
---|
| 702 | int32_t moved_bytes; // total number of moved bytes (fot return) |
---|
| 703 | xptr_t server_xp; // extended pointer on NIC_TX / NIC_RX server thread |
---|
| 704 | thread_t * server_ptr; // local pointer on NIC_TX / NIC_RX server thread |
---|
| 705 | |
---|
| 706 | thread_t * this = CURRENT_THREAD; |
---|
| 707 | process_t * process = this->process; |
---|
| 708 | |
---|
| 709 | // get pointers on file descriptor identifying the socket |
---|
| 710 | file_xp = process_fd_get_xptr( process , fdid ); |
---|
| 711 | file_ptr = GET_PTR( file_xp ); |
---|
| 712 | file_cxy = GET_CXY( file_xp ); |
---|
| 713 | |
---|
| 714 | if( file_xp == XPTR_NULL ) |
---|
| 715 | { |
---|
| 716 | printk("\n[ERROR] in %s : undefined fdid %d / thread%x,%x]\n", |
---|
| 717 | __FUNCTION__, fdid , process->pid, this->trdid ); |
---|
| 718 | return -1; |
---|
| 719 | } |
---|
| 720 | |
---|
| 721 | // get file type and socket pointer |
---|
| 722 | file_type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) ); |
---|
| 723 | |
---|
| 724 | // get local pointer on socket |
---|
| 725 | socket_ptr = hal_remote_lpt( XPTR( file_cxy , &file_ptr->socket ) ); |
---|
| 726 | |
---|
| 727 | // check file descriptor type |
---|
| 728 | if( file_type != INODE_TYPE_SOCK ) |
---|
| 729 | { |
---|
| 730 | printk("\n[ERROR] in %s : illegal file type %s / fdid %d / thread%x,%x]\n", |
---|
| 731 | __FUNCTION__, vfs_inode_type_str(file_type), fdid, process->pid, this->trdid ); |
---|
| 732 | return -1; |
---|
| 733 | } |
---|
| 734 | |
---|
| 735 | // build extended pointer on file lock protecting socket |
---|
| 736 | socket_lock_xp = XPTR( file_cxy , &file_ptr->lock ); |
---|
| 737 | |
---|
| 738 | // take the socket lock |
---|
| 739 | remote_rwlock_wr_acquire( socket_lock_xp ); |
---|
| 740 | |
---|
| 741 | // get socket type, state, and channel |
---|
| 742 | socket_type = hal_remote_l32( XPTR( file_cxy , &socket_ptr->type )); |
---|
| 743 | socket_state = hal_remote_l32( XPTR( file_cxy , &socket_ptr->state )); |
---|
| 744 | nic_channel = hal_remote_l32( XPTR( file_cxy , &socket_ptr->nic_channel )); |
---|
| 745 | |
---|
| 746 | // check socket state / type |
---|
| 747 | if( socket_type == SOCK_STREAM ) // TCP socket |
---|
| 748 | { |
---|
| 749 | if( socket_state != TCP_STATE_ESTAB ) |
---|
| 750 | { |
---|
| 751 | printk("\n[ERROR] in %s : illegal SEND/RECV for state %s / thread%x,%x]\n", |
---|
| 752 | __FUNCTION__, socket_state_str(socket_state), process->pid, this->trdid ); |
---|
| 753 | return -1; |
---|
| 754 | } |
---|
| 755 | |
---|
| 756 | if( explicit ) |
---|
| 757 | { |
---|
| 758 | // get remote IP address and type from socket descriptor |
---|
| 759 | remote_addr = hal_remote_l32( XPTR( file_cxy , &socket_ptr->remote_addr )); |
---|
| 760 | remote_port = hal_remote_l32( XPTR( file_cxy , &socket_ptr->remote_port )); |
---|
| 761 | |
---|
| 762 | if( (remote_addr != explicit_addr) || (remote_port != explicit_port) ) |
---|
| 763 | { |
---|
| 764 | printk("\n[ERROR] in %s : wrong expliciy access / thread%x,%x]\n", |
---|
| 765 | __FUNCTION__, process->pid, this->trdid ); |
---|
| 766 | return -1; |
---|
| 767 | } |
---|
| 768 | } |
---|
| 769 | } |
---|
| 770 | else // UDP socket |
---|
| 771 | { |
---|
| 772 | if( explicit ) |
---|
| 773 | { |
---|
| 774 | if( socket_state == UDP_STATE_UNBOUND ) |
---|
| 775 | { |
---|
| 776 | printk("\n[ERROR] in %s : illegal SEND/RECV for state %s / thread%x,%x]\n", |
---|
| 777 | __FUNCTION__, socket_state_str(socket_state), process->pid, this->trdid ); |
---|
| 778 | return -1; |
---|
| 779 | } |
---|
| 780 | |
---|
| 781 | // update remote IP address and port into socket descriptor |
---|
| 782 | hal_remote_s32( XPTR( file_cxy , &socket_ptr->remote_addr ), explicit_addr ); |
---|
| 783 | hal_remote_s32( XPTR( file_cxy , &socket_ptr->remote_port ), explicit_port ); |
---|
| 784 | } |
---|
| 785 | else |
---|
| 786 | { |
---|
| 787 | if( socket_state != UDP_STATE_CONNECT ) |
---|
| 788 | { |
---|
| 789 | printk("\n[ERROR] in %s : illegal SEND/RECV for state %s / thread%x,%x]\n", |
---|
| 790 | __FUNCTION__, socket_state_str(socket_state), process->pid, this->trdid ); |
---|
| 791 | return -1; |
---|
| 792 | } |
---|
| 793 | } |
---|
| 794 | } |
---|
| 795 | |
---|
| 796 | /////////////////////////////////////////////////////// |
---|
| 797 | if( is_send ) // SEND command |
---|
| 798 | { |
---|
| 799 | // build extended pointer on socket "tx_client" |
---|
| 800 | xptr_t client_xp = XPTR( file_cxy , &socket_ptr->tx_client ); |
---|
| 801 | |
---|
| 802 | // check no previous SEND command |
---|
| 803 | xptr_t client = hal_remote_l64( client_xp ); |
---|
| 804 | |
---|
| 805 | if( client != XPTR_NULL ) // release socket lock and return error |
---|
| 806 | { |
---|
| 807 | // release socket lock |
---|
| 808 | remote_rwlock_wr_release( socket_lock_xp ); |
---|
| 809 | |
---|
| 810 | // get previous thread cluster & local pointer |
---|
| 811 | cxy_t prev_cxy = GET_CXY( client ); |
---|
| 812 | thread_t * prev_ptr = GET_PTR( client ); |
---|
| 813 | |
---|
| 814 | // get previous command type and trdid |
---|
| 815 | uint32_t prev_cmd = hal_remote_l32( XPTR( prev_cxy , &prev_ptr->nic_cmd.type )); |
---|
| 816 | uint32_t prev_tid = hal_remote_l32( XPTR( prev_cxy , &prev_ptr->trdid )); |
---|
| 817 | |
---|
| 818 | printk("\n[ERROR] in %s : previous command %s for thread %x / thread%x,%x]\n", |
---|
| 819 | __FUNCTION__, socket_cmd_str(prev_cmd), prev_tid, |
---|
| 820 | process->pid, this->trdid ); |
---|
| 821 | |
---|
| 822 | return -1; |
---|
| 823 | } |
---|
| 824 | |
---|
| 825 | // client thread registers in socket descriptor |
---|
| 826 | hal_remote_s64( client_xp , XPTR( local_cxy , this ) ); |
---|
| 827 | hal_remote_s32( XPTR( file_cxy , &socket_ptr->tx_cmd ) , SOCKET_TX_SEND ); |
---|
| 828 | hal_remote_spt( XPTR( file_cxy , &socket_ptr->tx_buf ) , u_buf ); |
---|
| 829 | hal_remote_s32( XPTR( file_cxy , &socket_ptr->tx_len ) , length ); |
---|
| 830 | hal_remote_s32( XPTR( file_cxy , &socket_ptr->tx_todo ) , length ); |
---|
| 831 | |
---|
| 832 | // release socket lock |
---|
| 833 | remote_rwlock_wr_release( socket_lock_xp ); |
---|
| 834 | |
---|
| 835 | // get pointers on relevant chdev |
---|
| 836 | chdev_xp = chdev_dir.nic_tx[nic_channel]; |
---|
| 837 | chdev_ptr = GET_PTR( chdev_xp ); |
---|
| 838 | chdev_cxy = GET_CXY( chdev_xp ); |
---|
| 839 | |
---|
| 840 | // get pointers on NIC_TX[channel] server thread |
---|
| 841 | server_ptr = hal_remote_lpt( XPTR( chdev_cxy , &chdev_ptr->server )); |
---|
| 842 | server_xp = XPTR( chdev_cxy , server_ptr ); |
---|
| 843 | |
---|
| 844 | // unblocks the NIC_TX server thread |
---|
| 845 | thread_unblock( server_xp , THREAD_BLOCKED_CLIENT ); |
---|
| 846 | |
---|
| 847 | // client thread blocks itself and deschedules |
---|
| 848 | thread_block( XPTR( local_cxy , this ) , THREAD_BLOCKED_IO ); |
---|
| 849 | sched_yield( "blocked in nic_io" ); |
---|
| 850 | |
---|
| 851 | // take the socket lock when unblocked |
---|
| 852 | remote_rwlock_wr_acquire( socket_lock_xp ); |
---|
| 853 | |
---|
| 854 | // unlink client thread from socket |
---|
| 855 | hal_remote_s64( client_xp , XPTR_NULL ); |
---|
| 856 | |
---|
| 857 | // release socket lock |
---|
| 858 | remote_rwlock_wr_release( socket_lock_xp ); |
---|
| 859 | |
---|
| 860 | // exit waiting loop and return |
---|
| 861 | return length; |
---|
| 862 | |
---|
| 863 | } // end SEND |
---|
| 864 | |
---|
| 865 | //////////////////////////////////////////////////////// |
---|
| 866 | else // RECV command |
---|
| 867 | { |
---|
| 868 | // build extended pointers on socket "rx_client" |
---|
| 869 | xptr_t client_xp = XPTR( file_cxy , &socket_ptr->rx_client ); |
---|
| 870 | |
---|
| 871 | // check no previous RECV command |
---|
| 872 | xptr_t client = hal_remote_l64( client_xp ); |
---|
| 873 | |
---|
| 874 | if( client != XPTR_NULL ) // release socket lock and return error |
---|
| 875 | { |
---|
| 876 | // release socket lock |
---|
| 877 | remote_rwlock_wr_release( socket_lock_xp ); |
---|
| 878 | |
---|
| 879 | // get previous thread cluster & local pointer |
---|
| 880 | cxy_t prev_cxy = GET_CXY( client ); |
---|
| 881 | thread_t * prev_ptr = GET_PTR( client ); |
---|
| 882 | |
---|
| 883 | // get previous command type and trdid |
---|
| 884 | uint32_t prev_cmd = hal_remote_l32( XPTR( prev_cxy , &prev_ptr->nic_cmd.type )); |
---|
| 885 | uint32_t prev_tid = hal_remote_l32( XPTR( prev_cxy , &prev_ptr->trdid )); |
---|
| 886 | |
---|
| 887 | printk("\n[ERROR] in %s : previous command %s for thread %x / thread%x,%x]\n", |
---|
| 888 | __FUNCTION__, socket_cmd_str(prev_cmd), prev_tid, process->pid, this->trdid ); |
---|
| 889 | return -1; |
---|
| 890 | } |
---|
| 891 | |
---|
| 892 | // build extended pointer on "rx_buf" |
---|
| 893 | xptr_t rx_buf_xp = XPTR( file_cxy , &socket_ptr->rx_buf ); |
---|
| 894 | |
---|
| 895 | // get rx_buf status from socket |
---|
| 896 | status = remote_buf_status( rx_buf_xp ); |
---|
| 897 | |
---|
| 898 | if( status == 0 ) // rx_buf empty => blocks and deschedules |
---|
| 899 | { |
---|
| 900 | // release socket lock |
---|
| 901 | remote_rwlock_wr_release( socket_lock_xp ); |
---|
| 902 | |
---|
| 903 | // client thread blocks itself and deschedules |
---|
| 904 | thread_block( XPTR( local_cxy , this ) , THREAD_BLOCKED_IO ); |
---|
| 905 | sched_yield( "blocked in nic_io" ); |
---|
| 906 | |
---|
| 907 | // take socket lock |
---|
| 908 | remote_rwlock_wr_release( socket_lock_xp ); |
---|
| 909 | } |
---|
| 910 | |
---|
| 911 | // number of moved bytes cannot be larger than u_buf size |
---|
| 912 | moved_bytes = ( length < status ) ? length : status; |
---|
| 913 | |
---|
| 914 | // move data from kernel rx_buf to user u_buf |
---|
| 915 | remote_buf_get_to_user( rx_buf_xp, |
---|
| 916 | u_buf, |
---|
| 917 | moved_bytes ); |
---|
| 918 | |
---|
| 919 | // reset rx_buf for an UDP socket |
---|
| 920 | if( socket_type == SOCK_DGRAM ) remote_buf_reset( rx_buf_xp ); |
---|
| 921 | |
---|
| 922 | // unlink client thread from socket |
---|
| 923 | hal_remote_s64( client_xp , XPTR_NULL ); |
---|
| 924 | |
---|
| 925 | // release socket lock |
---|
| 926 | remote_rwlock_wr_release( socket_lock_xp ); |
---|
| 927 | |
---|
| 928 | // exit waiting loop and return |
---|
| 929 | return moved_bytes; |
---|
| 930 | |
---|
| 931 | } // end SEND |
---|
| 932 | |
---|
| 933 | } // end dev_nic_register_cmd() |
---|
| 934 | |
---|
| 935 | |
---|
| 936 | /////////////////////////////////// |
---|
| 937 | int dev_nic_send( uint32_t fdid, |
---|
| 938 | uint8_t * u_buf, |
---|
| 939 | uint32_t length ) |
---|
| 940 | { |
---|
| 941 | #if DEBUG_DEV_NIC_TX |
---|
| 942 | thread_t * this = CURRENT_THREAD; |
---|
| 943 | process_t * process = this->process; |
---|
| 944 | trdid_t trdid = this->trdid; |
---|
| 945 | pid_t pid = process->pid; |
---|
| 946 | uint32_t cycle = (uint32_t)hal_get_cycle(); |
---|
| 947 | if (DEBUG_DEV_NIC_TX < cycle ) |
---|
| 948 | printk("[%s] thread[%x,%x] enters : fdid %d / buf %x / length %d / cycle %d\n", |
---|
| 949 | __FUNCTION__, pid, trdid, fdid, u_buf, length, cycle ); |
---|
| 950 | #endif |
---|
| 951 | |
---|
| 952 | error_t error = dev_nic_register_cmd( true, // SEND |
---|
| 953 | fdid, |
---|
| 954 | u_buf, |
---|
| 955 | length, |
---|
| 956 | false, 0, 0 ); // no explicit remote socket |
---|
| 957 | #if DEBUG_DEV_NIC_TX |
---|
| 958 | cycle = (uint32_t)hal_get_cycle(); |
---|
| 959 | if (DEBUG_DEV_NIC_TX < cycle ) |
---|
| 960 | printk("[%s] thread[%x,%x] exit : fdid %d / cycle %d\n", |
---|
| 961 | __FUNCTION__, pid, trdid, cycle ); |
---|
| 962 | #endif |
---|
| 963 | |
---|
| 964 | return error; |
---|
| 965 | |
---|
| 966 | } // end dev_nic_send() |
---|
| 967 | |
---|
| 968 | /////////////////////////////////// |
---|
| 969 | int dev_nic_recv( uint32_t fdid, |
---|
| 970 | uint8_t * u_buf, |
---|
| 971 | uint32_t length ) |
---|
| 972 | { |
---|
[438] | 973 | #if DEBUG_DEV_NIC_RX |
---|
[657] | 974 | thread_t * this = CURRENT_THREAD; |
---|
| 975 | process_t * process = this->process; |
---|
| 976 | trdid_t trdid = this->trdid; |
---|
| 977 | pid_t pid = process->pid; |
---|
| 978 | uint32_t cycle = (uint32_t)hal_get_cycle(); |
---|
| 979 | if (DEBUG_DEV_NIC_RX < cycle ) |
---|
| 980 | printk("[%s] thread[%x,%x] enters : fdid %d / buf %x / length %d / cycle %d\n", |
---|
| 981 | __FUNCTION__, pid, trdid, fdid, u_buf, length, cycle ); |
---|
[437] | 982 | #endif |
---|
[1] | 983 | |
---|
[657] | 984 | error_t error = dev_nic_register_cmd( false, // RECV |
---|
| 985 | fdid, |
---|
| 986 | u_buf, |
---|
| 987 | length, |
---|
| 988 | false, 0, 0 ); // no explicit remote socket |
---|
| 989 | #if DEBUG_DEV_NIC_RX |
---|
| 990 | cycle = (uint32_t)hal_get_cycle(); |
---|
| 991 | if (DEBUG_DEV_NIC_RX < cycle ) |
---|
| 992 | printk("[%s] thread[%x,%x] exit : fdid %d / cycle %d\n", |
---|
| 993 | __FUNCTION__, pid, trdid, cycle ); |
---|
| 994 | #endif |
---|
[1] | 995 | |
---|
[657] | 996 | return error; |
---|
[1] | 997 | |
---|
[657] | 998 | } // end dev_nic_recv() |
---|
[1] | 999 | |
---|
[657] | 1000 | ///////////////////////////////////// |
---|
| 1001 | int dev_nic_sendto( uint32_t fdid, |
---|
| 1002 | uint8_t * u_buf, |
---|
| 1003 | uint32_t length, |
---|
| 1004 | uint32_t remote_addr, |
---|
| 1005 | uint32_t remote_port ) |
---|
| 1006 | { |
---|
| 1007 | #if DEBUG_DEV_NIC_TX |
---|
| 1008 | thread_t * this = CURRENT_THREAD; |
---|
| 1009 | process_t * process = this->process; |
---|
| 1010 | trdid_t trdid = this->trdid; |
---|
| 1011 | pid_t pid = process->pid; |
---|
| 1012 | uint32_t cycle = (uint32_t)hal_get_cycle(); |
---|
| 1013 | if (DEBUG_DEV_NIC_TX < cycle ) |
---|
| 1014 | printk("[%s] thread[%x,%x] enters : fdid %d / buf %x / length %d / cycle %d\n", |
---|
| 1015 | __FUNCTION__, pid, trdid, fdid, u_buf, length, cycle ); |
---|
| 1016 | #endif |
---|
[1] | 1017 | |
---|
[657] | 1018 | error_t error = dev_nic_register_cmd( true, // SEND |
---|
| 1019 | fdid, |
---|
| 1020 | u_buf, |
---|
| 1021 | length, |
---|
| 1022 | true, // explicit remote socket |
---|
| 1023 | remote_addr, |
---|
| 1024 | remote_port ); |
---|
| 1025 | #if DEBUG_DEV_NIC_TX |
---|
| 1026 | cycle = (uint32_t)hal_get_cycle(); |
---|
| 1027 | if (DEBUG_DEV_NIC_TX < cycle ) |
---|
| 1028 | printk("[%s] thread[%x,%x] exit : fdid %d / cycle %d\n", |
---|
| 1029 | __FUNCTION__, pid, trdid, cycle ); |
---|
| 1030 | #endif |
---|
[1] | 1031 | |
---|
[657] | 1032 | return error; |
---|
[1] | 1033 | |
---|
[657] | 1034 | } // end dev_nic_sendto() |
---|
[1] | 1035 | |
---|
[657] | 1036 | /////////////////////////////////////// |
---|
| 1037 | int dev_nic_recvfrom( uint32_t fdid, |
---|
| 1038 | uint8_t * u_buf, |
---|
| 1039 | uint32_t length, |
---|
| 1040 | uint32_t remote_addr, |
---|
| 1041 | uint32_t remote_port ) |
---|
| 1042 | { |
---|
| 1043 | #if DEBUG_DEV_NIC_RX |
---|
| 1044 | thread_t * this = CURRENT_THREAD; |
---|
| 1045 | process_t * process = this->process; |
---|
| 1046 | trdid_t trdid = this->trdid; |
---|
| 1047 | pid_t pid = process->pid; |
---|
| 1048 | uint32_t cycle = (uint32_t)hal_get_cycle(); |
---|
| 1049 | if (DEBUG_DEV_NIC_RX < cycle ) |
---|
| 1050 | printk("[%s] thread[%x,%x] enters : fdid %d / buf %x / length %d / cycle %d\n", |
---|
| 1051 | __FUNCTION__, pid, trdid, fdid, u_buf, length, cycle ); |
---|
| 1052 | #endif |
---|
[565] | 1053 | |
---|
[657] | 1054 | error_t error = dev_nic_register_cmd( false, // RECV |
---|
| 1055 | fdid, |
---|
| 1056 | u_buf, |
---|
| 1057 | length, |
---|
| 1058 | true, // explicit remote socket |
---|
| 1059 | remote_addr, |
---|
| 1060 | remote_port ); |
---|
| 1061 | #if DEBUG_DEV_NIC_RX |
---|
| 1062 | cycle = (uint32_t)hal_get_cycle(); |
---|
| 1063 | if (DEBUG_DEV_NIC_RX < cycle ) |
---|
| 1064 | printk("[%s] thread[%x,%x] exit : fdid %d / cycle %d\n", |
---|
| 1065 | __FUNCTION__, pid, trdid, cycle ); |
---|
| 1066 | #endif |
---|
[1] | 1067 | |
---|
[657] | 1068 | return error; |
---|
| 1069 | |
---|
| 1070 | } // end dev_nic_recvfrom() |
---|
| 1071 | |
---|
| 1072 | |
---|
| 1073 | |
---|
| 1074 | |
---|
| 1075 | |
---|
| 1076 | |
---|
| 1077 | |
---|
| 1078 | |
---|
| 1079 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1080 | // Functions called by the NIC_RX server thread |
---|
| 1081 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1082 | |
---|
| 1083 | ///////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1084 | // This static function is called by the NIC_RX[channel] server thread to register |
---|
| 1085 | // a send request defined by the <flags> argument in the R2T queue specified by |
---|
| 1086 | // the <queue_xp> argument. |
---|
| 1087 | ///////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1088 | // @ queue_xp : [in] extended pointer on the R2T qeue descriptor. |
---|
| 1089 | // @ flags : [in] flags to be set in the TCP segment. |
---|
| 1090 | ///////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1091 | static void dev_nic_rx_put_r2t_request( xptr_t queue_xp, |
---|
| 1092 | uint32_t flags ) |
---|
| 1093 | { |
---|
| 1094 | while( 1 ) |
---|
| 1095 | { |
---|
| 1096 | error_t error = remote_buf_put_from_kernel( queue_xp, |
---|
| 1097 | (uint8_t *)(&flags), |
---|
| 1098 | 1 ); |
---|
| 1099 | |
---|
| 1100 | if( error ) sched_yield( "waiting R2T queue" ); |
---|
| 1101 | else break; |
---|
[1] | 1102 | } |
---|
| 1103 | |
---|
[657] | 1104 | } // end dev_nic_rx_put_r2t_request() |
---|
| 1105 | |
---|
| 1106 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1107 | // This static function is called by the dev_nic_rx_server() function. |
---|
| 1108 | // It calls directly the NIC driver (with the READABLE command) and returns the status |
---|
| 1109 | // of the NIC_RX queue identified by the <chdev> argument. |
---|
| 1110 | // in the <readable> buffer. |
---|
| 1111 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1112 | // @ chdev : [in] local pointer on NIC_TX chdev. |
---|
| 1113 | // @ readable : [out] zero if queue empty. |
---|
| 1114 | // @ returns 0 if success / returns -1 if failure in accessing NIC device. |
---|
| 1115 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1116 | error_t dev_nic_rx_queue_readable( chdev_t * chdev, |
---|
| 1117 | uint32_t * readable ) |
---|
| 1118 | { |
---|
| 1119 | thread_t * this = CURRENT_THREAD; |
---|
[1] | 1120 | |
---|
[657] | 1121 | // initialize NIC_READABLE command in thread descriptor |
---|
| 1122 | this->nic_cmd.dev_xp = XPTR( local_cxy , chdev ); |
---|
| 1123 | this->nic_cmd.type = NIC_CMD_READABLE; |
---|
[1] | 1124 | |
---|
[657] | 1125 | // call driver to test readable |
---|
| 1126 | chdev->cmd( XPTR( local_cxy , this ) ); |
---|
| 1127 | |
---|
| 1128 | // return status |
---|
| 1129 | *readable = this->nic_cmd.status; |
---|
| 1130 | |
---|
| 1131 | // return error |
---|
| 1132 | return this->nic_cmd.error; |
---|
| 1133 | } |
---|
| 1134 | |
---|
| 1135 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1136 | // This static function is called by the dev_nic_rx_server() function. |
---|
| 1137 | // It moves one Ethernet packet from the NIC_RX_QUEUE identified the <chdev> argument, |
---|
| 1138 | // to the 2K bytes kernel buffer identified by the <buffer> argument. The actual |
---|
| 1139 | // Ethernet packet length is returned in the <length> argument. |
---|
| 1140 | // It calls directly the NIC driver with the READ command, without registering in the |
---|
| 1141 | // waiting queue, because only the NIC_RX server thread can access this NIC_RX_QUEUE. |
---|
| 1142 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1143 | // @ chdev : [in] local pointer on NIC_TX chdev. |
---|
| 1144 | // @ buffer : [in] local pointer on destination kernel buffer. |
---|
| 1145 | // @ length : [out] Ethernet packet size in bytes. |
---|
| 1146 | // @ returns 0 if success / returns -1 if failure in accessing NIC device. |
---|
| 1147 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1148 | error_t dev_nic_rx_move_packet( chdev_t * chdev, |
---|
| 1149 | uint8_t * k_buf, |
---|
| 1150 | uint32_t * length ) |
---|
| 1151 | { |
---|
| 1152 | thread_t * this = CURRENT_THREAD; |
---|
| 1153 | |
---|
| 1154 | #if DEBUG_DEV_NIC_RX |
---|
| 1155 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
| 1156 | if( DEBUG_DEV_NIC_RX < cycle ) |
---|
| 1157 | printk("\n[%s] thread[%x,%x] enters / cycle %d\n", |
---|
| 1158 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
| 1159 | #endif |
---|
| 1160 | |
---|
| 1161 | // initialize NIC_READ command in thread descriptor |
---|
| 1162 | this->nic_cmd.type = NIC_CMD_READ; |
---|
| 1163 | this->nic_cmd.buffer = k_buf; |
---|
| 1164 | |
---|
| 1165 | // call NIC driver |
---|
| 1166 | chdev->cmd( XPTR( local_cxy , this ) ); |
---|
| 1167 | |
---|
[1] | 1168 | // returns packet length |
---|
[657] | 1169 | *length = this->nic_cmd.length; |
---|
[1] | 1170 | |
---|
[657] | 1171 | // check error |
---|
| 1172 | if( this->nic_cmd.error ) |
---|
| 1173 | { |
---|
| 1174 | |
---|
[438] | 1175 | #if DEBUG_DEV_NIC_RX |
---|
[437] | 1176 | cycle = (uint32_t)hal_get_cycles(); |
---|
[438] | 1177 | if( DEBUG_DEV_NIC_RX < cycle ) |
---|
[657] | 1178 | printk("\n[%s] thread[%x,%x] exit / ERROR in NIC_RX / cycle %d\n", |
---|
| 1179 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
[437] | 1180 | #endif |
---|
[1] | 1181 | |
---|
[657] | 1182 | return -1; |
---|
| 1183 | } |
---|
| 1184 | else |
---|
| 1185 | { |
---|
| 1186 | |
---|
| 1187 | #if DEBUG_DEV_NIC_RX |
---|
| 1188 | cycle = (uint32_t)hal_get_cycles(); |
---|
| 1189 | if( DEBUG_DEV_NIC_RX < cycle ) |
---|
| 1190 | printk("\n[%s] thread[%x,%x] exit / SUCCESS / cycle %d\n", |
---|
| 1191 | __FUNCTION__, this->process->pid, this->trdid, cycle ); |
---|
| 1192 | #endif |
---|
| 1193 | |
---|
| 1194 | return 0; |
---|
| 1195 | } |
---|
| 1196 | |
---|
| 1197 | } // end dev_nic_rx_move_packet() |
---|
| 1198 | |
---|
| 1199 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1200 | // This static function is called by the dev_nic_rx_server() function. |
---|
| 1201 | // It analyses an Ethernet frame contained in the kernel buffer defined |
---|
| 1202 | // by the <buffer> argument, and returns in the <ip_length> argument the length |
---|
| 1203 | // of the IP packet contained in the Ethernet packet payload. |
---|
| 1204 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1205 | // @ buffer : [in] pointer on a received Ethernet packet |
---|
| 1206 | // @ ip_length : [out] length of IP packet (in bytes). |
---|
| 1207 | // @ return 0 if success / return -1 if illegal packet length. |
---|
| 1208 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1209 | static error_t dev_nic_rx_check_eth( uint8_t * buffer, |
---|
| 1210 | uint32_t * ip_length ) |
---|
| 1211 | { |
---|
| 1212 | uint32_t length = ((uint32_t)buffer[12] << 8) | (uint32_t)buffer[13]; |
---|
| 1213 | |
---|
| 1214 | *ip_length = length; |
---|
| 1215 | |
---|
[1] | 1216 | return 0; |
---|
[657] | 1217 | } |
---|
| 1218 | |
---|
| 1219 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1220 | // This static function analyses the IP packet contained in the kernel buffer |
---|
| 1221 | // defined by the <buffer> argument, and returns in the <ip_src_addr>, <ip_dst_addr>, |
---|
| 1222 | // <header_length> and <protocol> arguments the informations contained in the IP header. |
---|
| 1223 | // It checks the IP packet length versus the value contained in Ethernet header. |
---|
| 1224 | // It checks the IP header checksum. |
---|
| 1225 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1226 | // @ buffer : [in] pointer on the IP packet. |
---|
| 1227 | // @ expected_length : [in] expected IP packet length (from Ethernet header). |
---|
| 1228 | // @ ip_src_addr : [out] source IP address. |
---|
| 1229 | // @ ip_dst_addr : [out] destination IP address. |
---|
| 1230 | // @ protocol : [out] transport protocol type. |
---|
| 1231 | // @ return 0 if success / return -1 if illegal packet. |
---|
| 1232 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1233 | static error_t dev_nic_rx_check_ip( uint8_t * buffer, |
---|
| 1234 | uint32_t expected_length, |
---|
| 1235 | uint32_t * ip_src_addr, |
---|
| 1236 | uint32_t * ip_dst_addr, |
---|
| 1237 | uint32_t * trsp_protocol ) |
---|
| 1238 | { |
---|
| 1239 | uint32_t length = ((uint32_t)buffer[2] << 8) | (uint32_t)buffer[3]; |
---|
[1] | 1240 | |
---|
[657] | 1241 | // discard packet if eth_length != ip_length |
---|
| 1242 | if( length != expected_length ) |
---|
| 1243 | { |
---|
[1] | 1244 | |
---|
[657] | 1245 | #if DEBUG_NIC_DEV |
---|
| 1246 | thread_t * this = CURRENT_THREAD; |
---|
| 1247 | printk("\n[%s] thread[%x,%x] enters : length (%d) != expected_length (%d)\n", |
---|
| 1248 | __FUNCTION__, this->process->pid, this->trdid, length, expected_length ); |
---|
| 1249 | #endif |
---|
[1] | 1250 | |
---|
[657] | 1251 | return -1; |
---|
| 1252 | } |
---|
| 1253 | |
---|
| 1254 | // compute IP header checksum |
---|
| 1255 | uint32_t received_cs = (uint32_t)dev_nic_ip_checksum( buffer ); |
---|
| 1256 | |
---|
| 1257 | // extract IP header checksum |
---|
| 1258 | uint32_t computed_cs = ((uint32_t)buffer[10] << 8) | ((uint32_t)buffer[11]); |
---|
| 1259 | |
---|
| 1260 | // discard packet if bad checksum |
---|
| 1261 | if( received_cs != computed_cs ) |
---|
| 1262 | { |
---|
| 1263 | |
---|
| 1264 | #if DEBUG_NIC_DEV |
---|
| 1265 | thread_t * this = CURRENT_THREAD; |
---|
| 1266 | printk("\n[%s] thread[%x,%x] computed checksum (%d) != received checksum (%d)\n", |
---|
| 1267 | __FUNCTION__, this->process->pid, this->trdid, computed_cs, received_cs ); |
---|
| 1268 | #endif |
---|
| 1269 | |
---|
| 1270 | return -1; |
---|
| 1271 | } |
---|
| 1272 | |
---|
| 1273 | |
---|
| 1274 | *ip_src_addr = ((uint32_t)buffer[12] << 24) | |
---|
| 1275 | ((uint32_t)buffer[13] << 16) | |
---|
| 1276 | ((uint32_t)buffer[14] << 8) | |
---|
| 1277 | ((uint32_t)buffer[15] ) ; |
---|
| 1278 | |
---|
| 1279 | *ip_dst_addr = ((uint32_t)buffer[16] << 24) | |
---|
| 1280 | ((uint32_t)buffer[17] << 16) | |
---|
| 1281 | ((uint32_t)buffer[18] << 8) | |
---|
| 1282 | ((uint32_t)buffer[19] ) ; |
---|
| 1283 | |
---|
| 1284 | *trsp_protocol = (uint32_t)buffer[9]; |
---|
| 1285 | |
---|
| 1286 | return 0; |
---|
| 1287 | } |
---|
| 1288 | |
---|
| 1289 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1290 | // This static function analyses the UDP packet contained in the kernel buffer |
---|
| 1291 | // defined by the <k_buf> and <k_length> arguments. |
---|
| 1292 | // It checks the UDP checksum, and discard corrupted packets. |
---|
| 1293 | // It scans the list of sockets attached to the NIC_RX chdev to find a matching socket, |
---|
| 1294 | // and discard the received packet if no UDP socket found. |
---|
| 1295 | // Finally, it copies the payload to the socket "rx_buf", as long as the packet payload |
---|
| 1296 | // is not larger than the rx_buf. |
---|
| 1297 | // It set the "rx_valid" flip-flop, and unblock the client thread when the last expected |
---|
| 1298 | // byte has been received. |
---|
| 1299 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1300 | // @ chdev : [in] local pointer on local NIC_RX chdev descriptor. |
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| 1301 | // @ k_buf : [in] pointer on the UDP packet in local kernel buffer. |
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| 1302 | // @ k_length : [in] number of bytes in buffer (including UDP header). |
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| 1303 | // @ pkt_src_addr : [in] source IP address (from IP packet header). |
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| 1304 | // @ pkt_dst_addr : [in] destination IP address (from IP packet header). |
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| 1305 | /////////////////////////////////////////////////////////////////////////////////////////// |
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| 1306 | static void dev_nic_rx_handle_udp_packet( chdev_t * chdev, |
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| 1307 | uint8_t * k_buf, |
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| 1308 | uint32_t k_length, |
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| 1309 | uint32_t pkt_src_addr, |
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| 1310 | uint32_t pkt_dst_addr ) |
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[1] | 1311 | { |
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[657] | 1312 | xptr_t root_xp; // extended pointer on attached sockets list root |
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| 1313 | xptr_t lock_xp; // extended pointer on chdev lock |
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| 1314 | xptr_t iter_xp; // iterator on socket list |
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| 1315 | xptr_t socket_xp; // extended pointer on socket descriptor |
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| 1316 | cxy_t socket_cxy; |
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| 1317 | socket_t * socket_ptr; |
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| 1318 | uint32_t socket_type; // socket type |
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| 1319 | uint32_t socket_state; // socket state |
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| 1320 | uint32_t local_addr; // local IP address from socket |
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| 1321 | uint32_t local_port; // local port from socket |
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| 1322 | uint32_t remote_addr; // remote IP address from socket |
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| 1323 | uint32_t remote_port; // remote port from socket |
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| 1324 | bool_t match_socket; // matching socket found |
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| 1325 | uint16_t checksum; // computed checksum |
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| 1326 | uint16_t pkt_checksum; // received checksum |
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| 1327 | xptr_t socket_rbuf_xp; // extended pointer on socket rx_buf |
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| 1328 | xptr_t socket_lock_xp; // extended pointer on socket lock |
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| 1329 | xptr_t socket_client_xp; // extended pointer on socket rx_client field |
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| 1330 | xptr_t client_xp; // extended pointer on client thread descriptor |
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| 1331 | uint32_t payload; // number of bytes in payload |
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| 1332 | uint32_t status; // number of bytes in rx_buf |
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| 1333 | uint32_t space; // number of free slots in rx_buf |
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| 1334 | uint32_t moved_bytes; // number of bytes actually moved to rx_buf |
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[1] | 1335 | |
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[657] | 1336 | // build extended pointers on list of sockets attached to NIC_RX chdev |
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| 1337 | root_xp = XPTR( local_cxy , &chdev->wait_root ); |
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| 1338 | lock_xp = XPTR( local_cxy , &chdev->wait_lock ); |
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[1] | 1339 | |
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[657] | 1340 | // compute UDP packet checksum |
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| 1341 | checksum = dev_nic_udp_checksum( k_buf , k_length ); |
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[1] | 1342 | |
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[657] | 1343 | // get checksum from received packet header |
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| 1344 | pkt_checksum = ((uint16_t)k_buf[6] << 8) | (uint16_t)k_buf[7]; |
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| 1345 | |
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| 1346 | // discard corrupted packet |
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| 1347 | if( pkt_checksum != checksum ) return; |
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| 1348 | |
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| 1349 | // get src_port and dst_port from UDP header |
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| 1350 | uint32_t pkt_src_port = ((uint32_t)k_buf[0] << 8) | (uint32_t)k_buf[1]; |
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| 1351 | uint32_t pkt_dst_port = ((uint32_t)k_buf[2] << 8) | (uint32_t)k_buf[3]; |
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| 1352 | |
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| 1353 | // discard unexpected packet |
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| 1354 | if( xlist_is_empty( root_xp ) ) return; |
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| 1355 | |
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| 1356 | // take the tock protecting the sockets list |
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| 1357 | remote_busylock_acquire( lock_xp ); |
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| 1358 | |
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| 1359 | match_socket = false; |
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| 1360 | |
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| 1361 | // scan sockets list to find a match |
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| 1362 | XLIST_FOREACH( root_xp , iter_xp ) |
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| 1363 | { |
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| 1364 | // get socket cluster and local pointer |
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| 1365 | socket_xp = XLIST_ELEMENT( iter_xp , socket_t , rx_list ); |
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| 1366 | socket_ptr = GET_PTR( socket_xp ); |
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| 1367 | socket_cxy = GET_CXY( socket_xp ); |
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| 1368 | |
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| 1369 | // get socket type |
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| 1370 | socket_type = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->type )); |
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| 1371 | socket_state = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->state )); |
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| 1372 | |
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| 1373 | // skip TCP socket |
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| 1374 | if( socket_type == SOCK_STREAM ) continue; |
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| 1375 | |
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| 1376 | // get relevant info from socket descriptor |
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| 1377 | local_addr = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->local_addr )); |
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| 1378 | remote_addr = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->remote_addr )); |
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| 1379 | local_port = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->local_port )); |
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| 1380 | remote_port = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->remote_port )); |
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| 1381 | |
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| 1382 | // compute matching |
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| 1383 | bool_t local_match = (local_addr == pkt_dst_addr) && |
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| 1384 | (local_port == pkt_dst_port); |
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| 1385 | |
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| 1386 | bool_t remote_match = (remote_addr == pkt_src_addr) && |
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| 1387 | (remote_port == pkt_src_port); |
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| 1388 | |
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| 1389 | if (socket_state == UDP_STATE_CONNECT ) match_socket = local_match && remote_match; |
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| 1390 | else match_socket = local_match; |
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| 1391 | |
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| 1392 | // exit loop when socket found |
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| 1393 | if( match_socket ) break; |
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| 1394 | } |
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| 1395 | |
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| 1396 | // release the lock protecting the sockets list |
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| 1397 | remote_busylock_release( lock_xp ); |
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| 1398 | |
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| 1399 | // discard unexpected packet |
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| 1400 | if( match_socket == false ) return; |
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| 1401 | |
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| 1402 | // build extended pointers on various socket fields |
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| 1403 | socket_rbuf_xp = XPTR( socket_cxy , &socket_ptr->rx_buf ); |
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| 1404 | socket_lock_xp = XPTR( socket_cxy , &socket_ptr->lock ); |
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| 1405 | socket_client_xp = XPTR( socket_cxy , &socket_ptr->rx_client ); |
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| 1406 | |
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| 1407 | // take the lock protecting the socket |
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| 1408 | remote_rwlock_wr_acquire( socket_lock_xp ); |
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| 1409 | |
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| 1410 | // get status & space from rx_buf |
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| 1411 | status = remote_buf_status( socket_rbuf_xp ); |
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| 1412 | space = NIC_RX_BUF_SIZE - status; |
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| 1413 | |
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| 1414 | // get client thread |
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| 1415 | client_xp = hal_remote_l64( socket_client_xp ); |
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| 1416 | |
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| 1417 | // get number of bytes in payload |
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| 1418 | payload = k_length - UDP_HEAD_LEN; |
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| 1419 | |
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| 1420 | // compute number of bytes to move : min (space , seg_payload) |
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| 1421 | moved_bytes = ( space < payload ) ? space : payload; |
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| 1422 | |
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| 1423 | // move payload from kernel buffer to socket rx_buf |
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| 1424 | remote_buf_put_from_kernel( socket_rbuf_xp, |
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| 1425 | k_buf + UDP_HEAD_LEN, |
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| 1426 | moved_bytes ); |
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| 1427 | |
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| 1428 | // unblock client thread if registered |
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| 1429 | if( client_xp != XPTR_NULL ) |
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| 1430 | { |
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| 1431 | thread_unblock( client_xp , THREAD_BLOCKED_IO ); |
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| 1432 | } |
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| 1433 | |
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| 1434 | // release the lock protecting the socket |
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| 1435 | remote_rwlock_wr_release( socket_lock_xp ); |
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| 1436 | |
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| 1437 | } // end dev_nic_rx_handle_udp_packet() |
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| 1438 | |
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| 1439 | /////////////////////////////////////////////////////////////////////////////////////////// |
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| 1440 | // This static function is called by the dev_nic_rx_server() function to handle one RX |
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| 1441 | // TCP segment contained in a kernel buffer defined by the <k_buf> & <k_length> arguments. |
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| 1442 | // It the received segment doesn't match an existing local socket, or is corrupted, |
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| 1443 | // this faulty segment is discarded. |
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| 1444 | /////////////////////////////////////////////////////////////////////////////////////////// |
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| 1445 | // Implementation note: |
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| 1446 | // 1) It checks the TCP checksum, and discard the corrupted segment. |
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| 1447 | // 2) It scans the list of sockets attached to the RX chdev, to find the socket |
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| 1448 | // matching the TCP segment header, and discards the segment if no socket found. |
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| 1449 | // 3) When a socket has been found, it takes the lock protecting the socket state, |
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| 1450 | // because the socket is accessed by both the NIC_TX and NIC_RX server threads. |
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| 1451 | // 4) Depending on the socket state, it handle the received segment, including the |
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| 1452 | // SYN, FIN, ACK and RST flags. It updates the socket state when required, moves |
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| 1453 | // data to the rx_buf when possible, and registers requests to the TX server |
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| 1454 | // thread in the R2T queue attached to the socket, to insert control flags in the |
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| 1455 | // TX stream, as required. |
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| 1456 | // 5) Finally, it releases the lock protecting the socke and returns. |
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| 1457 | /////////////////////////////////////////////////////////////////////////////////////////// |
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| 1458 | // @ chdev : [in] local pointer on local NIC_RX chdev descriptor. |
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| 1459 | // @ k_buf : [in] pointer on the TCP packet in local kernel buffer. |
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| 1460 | // @ k_length : [in] number of bytes in buffer (including TCP header). |
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| 1461 | // @ seg_src_addr : [in] source IP address (from IP packet header). |
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| 1462 | // @ seg_dst_addr : [in] destination IP address (from IP packet header). |
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| 1463 | /////////////////////////////////////////////////////////////////////////////////////////// |
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| 1464 | static void dev_nic_rx_handle_tcp_segment( chdev_t * chdev, |
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| 1465 | uint8_t * k_buf, |
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| 1466 | uint32_t k_length, |
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| 1467 | uint32_t seg_src_addr, |
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| 1468 | uint32_t seg_dst_addr ) |
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| 1469 | { |
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| 1470 | xptr_t root_xp; // extended pointer on attached sockets list root |
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| 1471 | xptr_t lock_xp; // extended pointer on chdev lock |
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| 1472 | xptr_t iter_xp; // iterator for these queues |
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| 1473 | bool_t match_socket; // true if socket found |
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| 1474 | xptr_t socket_xp; // extended pointer on matching socket descriptor |
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| 1475 | cxy_t socket_cxy; |
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| 1476 | socket_t * socket_ptr; |
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| 1477 | uint32_t local_addr; // local IP address from socket |
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| 1478 | uint32_t local_port; // local port from socket |
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| 1479 | uint32_t remote_addr; // remote IP address from socket |
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| 1480 | uint32_t remote_port; // remote port from socket |
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| 1481 | uint32_t socket_state; // socket state |
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| 1482 | uint32_t socket_type; // socket type |
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| 1483 | uint32_t socket_tx_nxt; // next byte to send in TX stream |
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| 1484 | uint32_t socket_tx_una; // first unacknowledged byte in TX stream |
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| 1485 | uint32_t socket_rx_nxt; // next expected byte in RX stream |
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| 1486 | uint32_t socket_rx_wnd; // current window value in RX stream |
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| 1487 | xptr_t socket_lock_xp; // extended pointer on lock protecting socket state |
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| 1488 | xptr_t socket_rx_buf_xp; // extended pointer on socket rx_buf |
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| 1489 | xptr_t socket_r2tq_xp; // extended pointer on socket r2t queue |
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| 1490 | xptr_t socket_client_xp; // extended pointer on socket rx_client thread |
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| 1491 | uint16_t checksum; // computed TCP segment chechsum |
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| 1492 | |
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| 1493 | // build extended pointer on xlist of all sockets attached to NIC_RX chdev |
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| 1494 | root_xp = XPTR( local_cxy , &chdev->wait_root ); |
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| 1495 | lock_xp = XPTR( local_cxy , &chdev->wait_lock ); |
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| 1496 | |
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| 1497 | // get relevant infos from TCP segment header |
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| 1498 | uint32_t seg_src_port = ((uint32_t)k_buf[0] << 8) | (uint32_t)k_buf[1]; |
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| 1499 | uint32_t seg_dst_port = ((uint32_t)k_buf[2] << 8) | (uint32_t)k_buf[3]; |
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| 1500 | |
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| 1501 | uint32_t seg_seq_num = ((uint32_t)k_buf[4] << 24) | |
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| 1502 | ((uint32_t)k_buf[5] << 16) | |
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| 1503 | ((uint32_t)k_buf[6] << 8) | |
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| 1504 | ((uint32_t)k_buf[7] ); |
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| 1505 | |
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| 1506 | uint32_t seg_ack_num = ((uint32_t)k_buf[8] << 24) | |
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| 1507 | ((uint32_t)k_buf[9] << 16) | |
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| 1508 | ((uint32_t)k_buf[10] << 8) | |
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| 1509 | ((uint32_t)k_buf[11] ); |
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| 1510 | |
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| 1511 | uint8_t seg_hlen = k_buf[12] >> 2; // TCP header length in bytes |
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| 1512 | |
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| 1513 | uint8_t seg_flags = k_buf[13]; |
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| 1514 | |
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| 1515 | bool_t seg_ack_set = ((seg_flags & TCP_FLAG_ACK) != 0); |
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| 1516 | bool_t seg_syn_set = ((seg_flags & TCP_FLAG_SYN) != 0); |
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| 1517 | bool_t seg_fin_set = ((seg_flags & TCP_FLAG_FIN) != 0); |
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| 1518 | bool_t seg_rst_set = ((seg_flags & TCP_FLAG_RST) != 0); |
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| 1519 | |
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| 1520 | uint16_t seg_window = ((uint32_t)k_buf[14] << 8) | (uint32_t)k_buf[15]; |
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| 1521 | |
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| 1522 | uint16_t seg_checksum = ((uint32_t)k_buf[16] << 8) | (uint32_t)k_buf[17]; |
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| 1523 | |
---|
| 1524 | uint32_t seg_payload = k_length - seg_hlen; // number of bytes in payload |
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| 1525 | |
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| 1526 | // 1. compute TCP checksum |
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| 1527 | checksum = dev_nic_tcp_checksum( k_buf, |
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| 1528 | k_length, |
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| 1529 | seg_src_addr, |
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| 1530 | seg_dst_addr ); |
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| 1531 | |
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| 1532 | // discard segment if corrupted |
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| 1533 | if( seg_checksum != checksum ) return; |
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| 1534 | |
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| 1535 | match_socket = false; |
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| 1536 | |
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| 1537 | // take the lock protecting the list of sockets |
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| 1538 | remote_busylock_acquire( lock_xp ); |
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| 1539 | |
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| 1540 | // 2. scan list of sockets to find a matching socket |
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| 1541 | XLIST_FOREACH( root_xp , iter_xp ) |
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| 1542 | { |
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| 1543 | // get socket cluster and local pointer |
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| 1544 | socket_xp = XLIST_ELEMENT( iter_xp , socket_t , rx_list ); |
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| 1545 | socket_ptr = GET_PTR( socket_xp ); |
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| 1546 | socket_cxy = GET_CXY( socket_xp ); |
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| 1547 | |
---|
| 1548 | // get socket type and state |
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| 1549 | socket_type = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->type )); |
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| 1550 | socket_state = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->state )); |
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| 1551 | |
---|
| 1552 | // skip UDP socket |
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| 1553 | if( socket_type == SOCK_DGRAM ) continue; |
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| 1554 | |
---|
| 1555 | // get relevant socket infos for matching |
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| 1556 | local_addr = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->local_addr )); |
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| 1557 | remote_addr = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->remote_addr )); |
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| 1558 | local_port = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->local_port )); |
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| 1559 | remote_port = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->remote_port )); |
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| 1560 | |
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| 1561 | // compute matching condition |
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| 1562 | // (in LISTEN state, remote_port and remote_addr can be unspecified) |
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| 1563 | if( socket_state == TCP_STATE_LISTEN ) |
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| 1564 | { |
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| 1565 | match_socket = (local_addr == seg_dst_addr) && |
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| 1566 | (local_port == seg_dst_port) ; |
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| 1567 | } |
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| 1568 | else |
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| 1569 | { |
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| 1570 | match_socket = (local_addr == seg_dst_addr) && |
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| 1571 | (local_port == seg_dst_port) && |
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| 1572 | (remote_addr == seg_src_addr) && |
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| 1573 | (remote_port == seg_src_port) ; |
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| 1574 | } |
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| 1575 | |
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| 1576 | // exit loop if matching |
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| 1577 | if( match_socket ) break; |
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| 1578 | |
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| 1579 | } // end loop on sockets |
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| 1580 | |
---|
| 1581 | // release the lock protecting the list of sockets |
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| 1582 | remote_busylock_release( lock_xp ); |
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| 1583 | |
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| 1584 | // discard segment if no matching socket found |
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| 1585 | if( match_socket == false ) return; |
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| 1586 | |
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| 1587 | // From here the actions depend on both the socket state, |
---|
| 1588 | // and the received segment flags |
---|
| 1589 | // - update socket state, |
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| 1590 | // - move data to rx_buf, |
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| 1591 | // - make a R2T request when required |
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| 1592 | |
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| 1593 | // build extended pointers on various socket fields |
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| 1594 | socket_lock_xp = XPTR( socket_cxy , &socket_ptr->lock ); |
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| 1595 | socket_rx_buf_xp = XPTR( socket_cxy , &socket_ptr->rx_buf ); |
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| 1596 | socket_r2tq_xp = XPTR( socket_cxy , &socket_ptr->r2tq ); |
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| 1597 | socket_client_xp = XPTR( socket_cxy , &socket_ptr->rx_client ); |
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| 1598 | |
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| 1599 | // 3. take the lock protecting the matching socket |
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| 1600 | remote_rwlock_wr_acquire( socket_lock_xp ); |
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| 1601 | |
---|
| 1602 | // get relevant socket infos from socket descriptor |
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| 1603 | socket_state = hal_remote_l32(XPTR( socket_cxy , &socket_ptr->state )); |
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| 1604 | socket_rx_nxt = hal_remote_l32(XPTR( socket_cxy , &socket_ptr->rx_nxt )); |
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| 1605 | socket_rx_wnd = hal_remote_l32(XPTR( socket_cxy , &socket_ptr->rx_wnd )); |
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| 1606 | socket_tx_una = hal_remote_l32(XPTR( socket_cxy , &socket_ptr->tx_una )); |
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| 1607 | socket_tx_nxt = hal_remote_l32(XPTR( socket_cxy , &socket_ptr->tx_nxt )); |
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| 1608 | |
---|
| 1609 | switch( socket_state ) |
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| 1610 | { |
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| 1611 | ////////////////////// |
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| 1612 | case TCP_STATE_LISTEN: |
---|
| 1613 | { |
---|
| 1614 | // [1] discard segment if RST flag |
---|
| 1615 | if( seg_rst_set ) return; |
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| 1616 | |
---|
| 1617 | // [2] send a RST & discard segment if ACK flag |
---|
| 1618 | if( seg_ack_set ) |
---|
| 1619 | { |
---|
| 1620 | // set socket.tx_nxt to seg_ack_num |
---|
| 1621 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_nxt ), |
---|
| 1622 | seg_ack_num ); |
---|
| 1623 | |
---|
| 1624 | // make RST request to R2T queue |
---|
| 1625 | dev_nic_rx_put_r2t_request( socket_r2tq_xp, |
---|
| 1626 | TCP_FLAG_RST ); |
---|
| 1627 | // discard segment |
---|
| 1628 | break; |
---|
| 1629 | } |
---|
| 1630 | |
---|
| 1631 | // [3] handle SYN flag |
---|
| 1632 | if( seg_syn_set ) |
---|
| 1633 | { |
---|
| 1634 | // set socket.rx_nxt to seg_seq_num + 1 |
---|
| 1635 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_nxt ), |
---|
| 1636 | seg_seq_num + 1 ); |
---|
| 1637 | |
---|
| 1638 | // set socket.tx_nxt to ISS |
---|
| 1639 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_nxt ), |
---|
| 1640 | TCP_ISS ); |
---|
| 1641 | |
---|
| 1642 | // set socket.rx_irs to seg_seq_num |
---|
| 1643 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_irs ), |
---|
| 1644 | seg_seq_num + 1 ); |
---|
| 1645 | |
---|
| 1646 | // make SYN.ACK request to R2T queue |
---|
| 1647 | dev_nic_rx_put_r2t_request( socket_r2tq_xp, |
---|
| 1648 | TCP_FLAG_SYN | TCP_FLAG_ACK ); |
---|
| 1649 | |
---|
| 1650 | // set socket.tx_nxt to ISS + 1 |
---|
| 1651 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_nxt ), |
---|
| 1652 | TCP_ISS + 1 ); |
---|
| 1653 | |
---|
| 1654 | // set socket.tx_una to ISS |
---|
| 1655 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_una ), |
---|
| 1656 | TCP_ISS ); |
---|
| 1657 | |
---|
| 1658 | // update socket.state |
---|
| 1659 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 1660 | TCP_STATE_SYN_RCVD ); |
---|
| 1661 | |
---|
| 1662 | // update socket.remote_addr |
---|
| 1663 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->remote_addr ), |
---|
| 1664 | seg_src_addr ); |
---|
| 1665 | |
---|
| 1666 | // update socket.remote_port |
---|
| 1667 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->remote_port ), |
---|
| 1668 | seg_src_port ); |
---|
| 1669 | } |
---|
| 1670 | break; |
---|
| 1671 | } |
---|
| 1672 | //////////////////////// |
---|
| 1673 | case TCP_STATE_SYN_SENT: |
---|
| 1674 | { |
---|
| 1675 | // [1] check ACK flag |
---|
| 1676 | if( seg_ack_set ) |
---|
| 1677 | { |
---|
| 1678 | if( seg_ack_num != TCP_ISS + 1 ) // ACK not acceptable |
---|
| 1679 | { |
---|
| 1680 | // discard segment if RST |
---|
| 1681 | if( seg_rst_set ) break; |
---|
| 1682 | |
---|
| 1683 | // set socket.tx_nxt to seg_ack_num |
---|
| 1684 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_nxt ), |
---|
| 1685 | seg_ack_num ); |
---|
| 1686 | |
---|
| 1687 | // make an RST request to R2T queue |
---|
| 1688 | dev_nic_rx_put_r2t_request( socket_r2tq_xp, |
---|
| 1689 | TCP_FLAG_RST ); |
---|
| 1690 | // discard segment |
---|
| 1691 | break; |
---|
| 1692 | } |
---|
| 1693 | } |
---|
| 1694 | |
---|
| 1695 | // [2] check RST flag |
---|
| 1696 | if( seg_rst_set ) |
---|
| 1697 | { |
---|
| 1698 | // TODO signal "error: connection reset" to user |
---|
| 1699 | |
---|
| 1700 | // update socket.state |
---|
| 1701 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 1702 | TCP_STATE_BOUND ); |
---|
| 1703 | |
---|
| 1704 | // discard segment |
---|
| 1705 | break; |
---|
| 1706 | } |
---|
| 1707 | |
---|
| 1708 | // [3] handle SYN flag when (no ACK or acceptable ACK, and no RST) |
---|
| 1709 | if( seg_syn_set ) |
---|
| 1710 | { |
---|
| 1711 | // TODO Ne faut-il pas tester seg_seq_num ? |
---|
| 1712 | |
---|
| 1713 | if( seg_ack_set ) // received both SYN and ACK |
---|
| 1714 | { |
---|
| 1715 | // set socket.rx_nxt to seg_seq_num + 1 |
---|
| 1716 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_nxt ), |
---|
| 1717 | seg_seq_num + 1 ); |
---|
| 1718 | |
---|
| 1719 | // set socket.tx_una to seg_ack_num |
---|
| 1720 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_una ), |
---|
| 1721 | seg_ack_num ); |
---|
| 1722 | |
---|
| 1723 | // set socket.rx_irs to seg_seq_num |
---|
| 1724 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_irs ), |
---|
| 1725 | seg_seq_num ); |
---|
| 1726 | |
---|
| 1727 | // update socket.state |
---|
| 1728 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 1729 | TCP_STATE_ESTAB ); |
---|
| 1730 | |
---|
| 1731 | // make an ACK request to R2T queue |
---|
| 1732 | dev_nic_rx_put_r2t_request( socket_r2tq_xp, |
---|
| 1733 | TCP_FLAG_ACK ); |
---|
| 1734 | } |
---|
| 1735 | else // received SYN without ACK |
---|
| 1736 | { |
---|
| 1737 | // update socket.state |
---|
| 1738 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 1739 | TCP_STATE_SYN_RCVD ); |
---|
| 1740 | |
---|
| 1741 | // set socket.tx_nxt to ISS |
---|
| 1742 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_nxt ), |
---|
| 1743 | TCP_ISS ); |
---|
| 1744 | |
---|
| 1745 | // make a SYN.ACK request to R2T queue |
---|
| 1746 | dev_nic_rx_put_r2t_request( socket_r2tq_xp, |
---|
| 1747 | TCP_FLAG_SYN | TCP_FLAG_ACK ); |
---|
| 1748 | } |
---|
| 1749 | } |
---|
| 1750 | break; |
---|
| 1751 | } |
---|
| 1752 | //////////////////////// |
---|
| 1753 | case TCP_STATE_SYN_RCVD: |
---|
| 1754 | case TCP_STATE_ESTAB: |
---|
| 1755 | case TCP_STATE_FIN_WAIT1: |
---|
| 1756 | case TCP_STATE_FIN_WAIT2: |
---|
| 1757 | case TCP_STATE_CLOSE_WAIT: |
---|
| 1758 | case TCP_STATE_CLOSING: |
---|
| 1759 | case TCP_STATE_LAST_ACK: |
---|
| 1760 | case TCP_STATE_TIME_WAIT: |
---|
| 1761 | { |
---|
| 1762 | // [1] check sequence number |
---|
| 1763 | |
---|
| 1764 | // compute min & max acceptable sequence numbers |
---|
| 1765 | uint32_t seq_min = socket_rx_nxt; |
---|
| 1766 | uint32_t seq_max = socket_rx_nxt + socket_rx_wnd - 1; |
---|
| 1767 | |
---|
| 1768 | // compute sequence number for last byte in segment |
---|
| 1769 | uint32_t seg_seq_last = seg_seq_num + seg_payload - 1; |
---|
| 1770 | |
---|
| 1771 | if( (seg_seq_num != socket_rx_nxt) || // out_of_order |
---|
| 1772 | (is_in_window( seg_seq_last, |
---|
| 1773 | seq_min, |
---|
| 1774 | seq_max ) == false) ) // out_of_window |
---|
| 1775 | { |
---|
| 1776 | // discard segment |
---|
| 1777 | return; |
---|
| 1778 | } |
---|
| 1779 | |
---|
| 1780 | // [2] handle RST flag |
---|
| 1781 | |
---|
| 1782 | if( seg_rst_set ) |
---|
| 1783 | { |
---|
| 1784 | if( socket_state == TCP_STATE_SYN_RCVD ) |
---|
| 1785 | { |
---|
| 1786 | // TODO unblock all clients threads with "reset" responses |
---|
| 1787 | } |
---|
| 1788 | else if( (socket_state == TCP_STATE_ESTAB ) || |
---|
| 1789 | (socket_state == TCP_STATE_FIN_WAIT1 ) || |
---|
| 1790 | (socket_state == TCP_STATE_FIN_WAIT2 ) || |
---|
| 1791 | (socket_state == TCP_STATE_CLOSE_WAIT) ) |
---|
| 1792 | { |
---|
| 1793 | // TODO all pending send & received commands |
---|
| 1794 | // must receive "reset" responses |
---|
| 1795 | |
---|
| 1796 | // TODO destroy the socket |
---|
| 1797 | } |
---|
| 1798 | else // all other states |
---|
| 1799 | { |
---|
| 1800 | |
---|
| 1801 | |
---|
| 1802 | } |
---|
| 1803 | |
---|
| 1804 | // [3] handle security & precedence TODO ... someday |
---|
| 1805 | |
---|
| 1806 | // [4] handle SYN flag |
---|
| 1807 | |
---|
| 1808 | if( seg_syn_set ) // received SYN |
---|
| 1809 | { |
---|
| 1810 | // TODO signal error to user |
---|
| 1811 | |
---|
| 1812 | // make an RST request to R2T queue |
---|
| 1813 | dev_nic_rx_put_r2t_request( socket_r2tq_xp, |
---|
| 1814 | TCP_FLAG_RST ); |
---|
| 1815 | // update socket state |
---|
| 1816 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 1817 | TCP_STATE_BOUND ); |
---|
| 1818 | } |
---|
| 1819 | |
---|
| 1820 | // [5] handle ACK flag |
---|
| 1821 | |
---|
| 1822 | if( seg_ack_set == false ) |
---|
| 1823 | { |
---|
| 1824 | // discard segment when ACK not set |
---|
| 1825 | break; |
---|
| 1826 | } |
---|
| 1827 | else if( socket_state == TCP_STATE_SYN_RCVD ) |
---|
| 1828 | { |
---|
| 1829 | if( is_in_window( seg_ack_num , socket_tx_una , socket_tx_nxt ) ) |
---|
| 1830 | { |
---|
| 1831 | // update socket.state to ESTAB |
---|
| 1832 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 1833 | TCP_STATE_ESTAB ); |
---|
| 1834 | } |
---|
| 1835 | else // unacceptable ACK |
---|
| 1836 | { |
---|
| 1837 | // set socket.tx_nxt to seg_ack_num |
---|
| 1838 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_nxt ), |
---|
| 1839 | seg_ack_num ); |
---|
| 1840 | |
---|
| 1841 | // make an RST request to R2T queue |
---|
| 1842 | dev_nic_rx_put_r2t_request( socket_r2tq_xp, |
---|
| 1843 | TCP_FLAG_RST ); |
---|
| 1844 | } |
---|
| 1845 | } |
---|
| 1846 | else if( (socket_state == TCP_STATE_ESTAB) || |
---|
| 1847 | (socket_state == TCP_STATE_FIN_WAIT1) || |
---|
| 1848 | (socket_state == TCP_STATE_FIN_WAIT1) || |
---|
| 1849 | (socket_state == TCP_STATE_CLOSE_WAIT) || |
---|
| 1850 | (socket_state == TCP_STATE_CLOSING) ) |
---|
| 1851 | { |
---|
| 1852 | if( is_in_window( seg_ack_num + 1 , socket_tx_una , socket_tx_nxt ) ) |
---|
| 1853 | { |
---|
| 1854 | // update socket.tx_una |
---|
| 1855 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_una ), |
---|
| 1856 | seg_ack_num ); |
---|
| 1857 | |
---|
| 1858 | // update socket.tx_wnd |
---|
| 1859 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_wnd ), |
---|
| 1860 | seg_window ); |
---|
| 1861 | } |
---|
| 1862 | else // unacceptable ACK |
---|
| 1863 | { |
---|
| 1864 | // discard segment |
---|
| 1865 | break; |
---|
| 1866 | } |
---|
| 1867 | |
---|
| 1868 | // specific for FIN_WAIT1 |
---|
| 1869 | if( socket_state == TCP_STATE_FIN_WAIT1 ) |
---|
| 1870 | { |
---|
| 1871 | if( seg_fin_set ) |
---|
| 1872 | { |
---|
| 1873 | // update socket.state |
---|
| 1874 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 1875 | TCP_STATE_FIN_WAIT2 ); |
---|
| 1876 | } |
---|
| 1877 | } |
---|
| 1878 | |
---|
| 1879 | // specific for CLOSING |
---|
| 1880 | if( socket_state == TCP_STATE_CLOSING ) |
---|
| 1881 | { |
---|
| 1882 | if( seg_ack_set ) |
---|
| 1883 | { |
---|
| 1884 | // update socket.state |
---|
| 1885 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 1886 | TCP_STATE_TIME_WAIT ); |
---|
| 1887 | } |
---|
| 1888 | else |
---|
| 1889 | { |
---|
| 1890 | // discard segment |
---|
| 1891 | break; |
---|
| 1892 | } |
---|
| 1893 | } |
---|
| 1894 | } |
---|
| 1895 | else if( socket_state == TCP_STATE_LAST_ACK ) |
---|
| 1896 | { |
---|
| 1897 | if( seg_ack_set ) |
---|
| 1898 | { |
---|
| 1899 | // update socket.state |
---|
| 1900 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 1901 | TCP_STATE_TIME_WAIT ); |
---|
| 1902 | } |
---|
| 1903 | |
---|
| 1904 | } |
---|
| 1905 | |
---|
| 1906 | // [6] handle URG flag TODO ... someday |
---|
| 1907 | |
---|
| 1908 | // [7] Move DATA to rx_buf and unblock client thread |
---|
| 1909 | |
---|
| 1910 | if( seg_payload ) |
---|
| 1911 | { |
---|
| 1912 | if( (socket_state == TCP_STATE_ESTAB) || |
---|
| 1913 | (socket_state == TCP_STATE_FIN_WAIT1) || |
---|
| 1914 | (socket_state == TCP_STATE_FIN_WAIT2) ) |
---|
| 1915 | { |
---|
| 1916 | // get number of bytes already stored in rx_buf |
---|
| 1917 | uint32_t status = remote_buf_status( socket_rx_buf_xp ); |
---|
| 1918 | |
---|
| 1919 | // compute empty space in rx_buf |
---|
| 1920 | uint32_t space = NIC_RX_BUF_SIZE - status; |
---|
| 1921 | |
---|
| 1922 | // compute number of bytes to move : min (space , seg_payload) |
---|
| 1923 | uint32_t nbytes = ( space < seg_payload ) ? space : seg_payload; |
---|
| 1924 | |
---|
| 1925 | // move payload from k_buf to rx_buf |
---|
| 1926 | remote_buf_put_from_kernel( socket_rx_buf_xp, |
---|
| 1927 | k_buf + seg_hlen, |
---|
| 1928 | nbytes ); |
---|
| 1929 | // update socket.rx_nxt |
---|
| 1930 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_nxt ), |
---|
| 1931 | socket_rx_nxt + nbytes ); |
---|
| 1932 | |
---|
| 1933 | // update socket.rx_wnd |
---|
| 1934 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_wnd ), |
---|
| 1935 | socket_rx_wnd - nbytes ); |
---|
| 1936 | |
---|
| 1937 | // make an ACK request to R2T queue |
---|
| 1938 | dev_nic_rx_put_r2t_request( socket_r2tq_xp, |
---|
| 1939 | TCP_FLAG_ACK ); |
---|
| 1940 | |
---|
| 1941 | // get extended pointer on rx_client thread |
---|
| 1942 | xptr_t client_xp = hal_remote_l64( socket_client_xp ); |
---|
| 1943 | |
---|
| 1944 | // unblock client thread |
---|
| 1945 | if( client_xp != XPTR_NULL ) |
---|
| 1946 | { |
---|
| 1947 | thread_unblock( client_xp , THREAD_BLOCKED_IO ); |
---|
| 1948 | } |
---|
| 1949 | } |
---|
| 1950 | } |
---|
| 1951 | |
---|
| 1952 | // [8] handle FIN flag |
---|
| 1953 | |
---|
| 1954 | if( seg_fin_set ) |
---|
| 1955 | { |
---|
| 1956 | if( (socket_state == TCP_STATE_UNBOUND) || |
---|
| 1957 | (socket_state == TCP_STATE_BOUND) || |
---|
| 1958 | (socket_state == TCP_STATE_LISTEN) || |
---|
| 1959 | (socket_state == TCP_STATE_SYN_SENT) ) |
---|
| 1960 | { |
---|
| 1961 | // discard segment |
---|
| 1962 | break; |
---|
| 1963 | } |
---|
| 1964 | else // all other states |
---|
| 1965 | { |
---|
| 1966 | // TODO signal "connection closing" |
---|
| 1967 | |
---|
| 1968 | // make an ACK request to R2T queue |
---|
| 1969 | dev_nic_rx_put_r2t_request( socket_r2tq_xp, |
---|
| 1970 | TCP_FLAG_ACK ); |
---|
| 1971 | |
---|
| 1972 | // increment socket.rx_nxt |
---|
| 1973 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_nxt ), |
---|
| 1974 | socket_rx_nxt + 1 ); |
---|
| 1975 | |
---|
| 1976 | if( (socket_state == TCP_STATE_SYN_RCVD) || |
---|
| 1977 | (socket_state == TCP_STATE_ESTAB) ) |
---|
| 1978 | { |
---|
| 1979 | // update socket.state |
---|
| 1980 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 1981 | TCP_STATE_TIME_WAIT ); |
---|
| 1982 | } |
---|
| 1983 | else if( socket_state == TCP_STATE_FIN_WAIT1 ) |
---|
| 1984 | { |
---|
| 1985 | if( seg_ack_set ) |
---|
| 1986 | { |
---|
| 1987 | // TODO start "time-wait" timer / turn off others timers |
---|
| 1988 | |
---|
| 1989 | // update socket.state |
---|
| 1990 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 1991 | TCP_STATE_TIME_WAIT ); |
---|
| 1992 | } |
---|
| 1993 | else |
---|
| 1994 | { |
---|
| 1995 | // update socket.state |
---|
| 1996 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 1997 | TCP_STATE_CLOSING ); |
---|
| 1998 | } |
---|
| 1999 | } |
---|
| 2000 | else if( socket_state == TCP_STATE_FIN_WAIT2 ) |
---|
| 2001 | { |
---|
| 2002 | // TODO start "time-wait" timer / turn off other timers |
---|
| 2003 | |
---|
| 2004 | // update socket.state |
---|
| 2005 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 2006 | TCP_STATE_TIME_WAIT ); |
---|
| 2007 | } |
---|
| 2008 | else if( socket_state == TCP_STATE_TIME_WAIT ) |
---|
| 2009 | { |
---|
| 2010 | // TODO restart "time_wait" timer |
---|
| 2011 | } |
---|
| 2012 | } |
---|
| 2013 | } // end if FIN |
---|
| 2014 | } // end case sockets synchronized |
---|
| 2015 | } // end switch socket state |
---|
| 2016 | |
---|
| 2017 | // release the lock protecting socket |
---|
| 2018 | remote_rwlock_wr_acquire( socket_lock_xp ); |
---|
| 2019 | |
---|
| 2020 | } // end socket found |
---|
| 2021 | |
---|
| 2022 | } // end dev_nic_rx_handle_tcp_segment() |
---|
| 2023 | |
---|
| 2024 | |
---|
| 2025 | ///////////////////////////////////////// |
---|
| 2026 | void dev_nic_rx_server( chdev_t * chdev ) |
---|
| 2027 | { |
---|
| 2028 | uint8_t k_buf[2048]; // kernel buffer for one ETH/IP/UDP packet |
---|
| 2029 | |
---|
| 2030 | uint32_t pkt_src_addr; // packet source IP address |
---|
| 2031 | uint32_t pkt_dst_addr; // packet destination IP address |
---|
| 2032 | uint32_t trsp_protocol; // transport protocol (TCP / UDP) |
---|
| 2033 | uint32_t eth_length; // size of Ethernet packet (bytes) |
---|
| 2034 | uint32_t ip_length; // size of IP packet in bytes |
---|
| 2035 | uint32_t nic_queue_readable; // NIC_RX queue non empty when true |
---|
| 2036 | error_t error; |
---|
| 2037 | |
---|
| 2038 | thread_t * this = CURRENT_THREAD; |
---|
| 2039 | |
---|
| 2040 | // check chdev direction and type |
---|
| 2041 | assert( (chdev->func == DEV_FUNC_NIC) && (chdev->is_rx == true) , |
---|
| 2042 | "illegal chdev type or direction" ); |
---|
| 2043 | |
---|
[565] | 2044 | // check thread can yield |
---|
[657] | 2045 | assert( (this->busylocks == 0), |
---|
| 2046 | "cannot yield : busylocks = %d\n", this->busylocks ); |
---|
[565] | 2047 | |
---|
[657] | 2048 | while( 1 ) |
---|
| 2049 | { |
---|
| 2050 | // check NIC_RX_QUEUE readable |
---|
| 2051 | error = dev_nic_rx_queue_readable( chdev, |
---|
| 2052 | &nic_queue_readable ); |
---|
| 2053 | if( error ) |
---|
| 2054 | { |
---|
| 2055 | printk("\n[PANIC] in %s : cannot access NIC_TX[%d] queue\n", |
---|
| 2056 | __FUNCTION__, chdev->channel ); |
---|
| 2057 | } |
---|
| 2058 | |
---|
| 2059 | if( nic_queue_readable ) // NIC_TX_QUEUE non empty |
---|
| 2060 | { |
---|
| 2061 | // moves one Ethernet packet to kernel buffer |
---|
| 2062 | error = dev_nic_rx_move_packet( chdev, |
---|
| 2063 | k_buf, |
---|
| 2064 | ð_length ); |
---|
| 2065 | if( error ) |
---|
| 2066 | { |
---|
| 2067 | printk("\n[PANIC] in %s : cannot read the NIC_TX[%d] queue\n", |
---|
| 2068 | __FUNCTION__, chdev->channel ); |
---|
| 2069 | } |
---|
[1] | 2070 | |
---|
[657] | 2071 | // analyse the ETH header |
---|
| 2072 | error = dev_nic_rx_check_eth( k_buf, |
---|
| 2073 | &ip_length ); |
---|
[1] | 2074 | |
---|
[657] | 2075 | // discard packet if error reported by Ethernet layer |
---|
| 2076 | if( error ) continue; |
---|
[1] | 2077 | |
---|
[657] | 2078 | // analyse the IP header |
---|
| 2079 | error = dev_nic_rx_check_ip( k_buf + ETH_HEAD_LEN, |
---|
| 2080 | ip_length, |
---|
| 2081 | &pkt_src_addr, |
---|
| 2082 | &pkt_dst_addr, |
---|
| 2083 | &trsp_protocol ); |
---|
[1] | 2084 | |
---|
[657] | 2085 | // discard packet if error reported by IP layer |
---|
| 2086 | if( error ) continue; |
---|
[1] | 2087 | |
---|
[657] | 2088 | // call relevant transport protocol |
---|
| 2089 | if( trsp_protocol == PROTOCOL_UDP ) |
---|
| 2090 | { |
---|
| 2091 | dev_nic_rx_handle_udp_packet( chdev, |
---|
| 2092 | k_buf + ETH_HEAD_LEN + IP_HEAD_LEN, |
---|
| 2093 | ip_length - IP_HEAD_LEN, |
---|
| 2094 | pkt_src_addr, |
---|
| 2095 | pkt_dst_addr ); |
---|
| 2096 | } |
---|
| 2097 | else if ( trsp_protocol == PROTOCOL_TCP) |
---|
| 2098 | { |
---|
| 2099 | dev_nic_rx_handle_tcp_segment( chdev, |
---|
| 2100 | k_buf + ETH_HEAD_LEN + IP_HEAD_LEN, |
---|
| 2101 | ip_length - IP_HEAD_LEN, |
---|
| 2102 | pkt_src_addr, |
---|
| 2103 | pkt_dst_addr ); |
---|
| 2104 | } |
---|
| 2105 | } |
---|
| 2106 | else // block and deschedule if NIC_RX_QUEUE empty |
---|
| 2107 | { |
---|
| 2108 | thread_block( XPTR( local_cxy , this ) , THREAD_BLOCKED_ISR ); |
---|
| 2109 | sched_yield( "waiting RX client" ); |
---|
| 2110 | } |
---|
| 2111 | |
---|
| 2112 | } // end of while loop |
---|
| 2113 | |
---|
| 2114 | } // end dev_nic_rx_server() |
---|
| 2115 | |
---|
| 2116 | |
---|
| 2117 | |
---|
| 2118 | |
---|
| 2119 | |
---|
| 2120 | |
---|
| 2121 | |
---|
| 2122 | |
---|
| 2123 | |
---|
| 2124 | |
---|
| 2125 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2126 | // Functions used by the NIC_TX server thread |
---|
| 2127 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2128 | |
---|
| 2129 | |
---|
| 2130 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2131 | // These static functions are called by the NIC_TX server thread to report the |
---|
| 2132 | // completion (success or error) of a TX command. |
---|
| 2133 | // - it print an error message in case of error. |
---|
| 2134 | // - it updates the "tx_error" field in socket descriptor. |
---|
| 2135 | // - it unblocks the client thread. |
---|
| 2136 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2137 | // @ socket_xp : [in] extended pointer on socket |
---|
| 2138 | // @ cmd_type : [in] SOCKET_TX_CONNECT / SOCKET_TX_SEND / SOCKET_TX_CLOSE |
---|
| 2139 | // @ socket_state : [in] current socket state |
---|
| 2140 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2141 | static void dev_nic_tx_report_error( xptr_t socket_xp, |
---|
| 2142 | uint32_t cmd_type, |
---|
| 2143 | uint32_t socket_state ) |
---|
| 2144 | { |
---|
| 2145 | printk("\n[ERROR] in %s : command %s in %s state\n", |
---|
| 2146 | __FUNCTION__, socket_cmd_str(cmd_type), socket_state_str(socket_state) ); |
---|
| 2147 | |
---|
| 2148 | // get socket thread cluster and local pointer |
---|
| 2149 | socket_t * socket_ptr = GET_PTR( socket_xp ); |
---|
| 2150 | cxy_t socket_cxy = GET_CXY( socket_xp ); |
---|
| 2151 | |
---|
| 2152 | // set tx_error field in socket descriptor |
---|
| 2153 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_error ) , 1 ); |
---|
| 2154 | |
---|
| 2155 | // get extended point on client thread |
---|
| 2156 | xptr_t client_xp = hal_remote_l64( XPTR( socket_cxy , &socket_ptr->tx_client )); |
---|
| 2157 | |
---|
| 2158 | // unblock the client thread |
---|
| 2159 | thread_unblock( client_xp , THREAD_BLOCKED_IO ); |
---|
| 2160 | } |
---|
| 2161 | |
---|
| 2162 | //////////////////////////////////////////////////////////// |
---|
| 2163 | static void dev_nic_tx_report_success( xptr_t socket_xp ) |
---|
| 2164 | { |
---|
| 2165 | // get socket thread cluster and local pointer |
---|
| 2166 | socket_t * socket_ptr = GET_PTR( socket_xp ); |
---|
| 2167 | cxy_t socket_cxy = GET_CXY( socket_xp ); |
---|
| 2168 | |
---|
| 2169 | // set tx_error field in socket descriptor |
---|
| 2170 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_error ) , 0 ); |
---|
| 2171 | |
---|
| 2172 | // get extended point on client thread |
---|
| 2173 | xptr_t client_xp = hal_remote_l64( XPTR( socket_cxy , &socket_ptr->tx_client )); |
---|
| 2174 | |
---|
| 2175 | // unblock the client thread |
---|
| 2176 | thread_unblock( client_xp , THREAD_BLOCKED_IO ); |
---|
| 2177 | } |
---|
| 2178 | |
---|
| 2179 | |
---|
| 2180 | |
---|
| 2181 | |
---|
| 2182 | |
---|
| 2183 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2184 | // This static function is called by the dev_nic_tx_server() function. |
---|
| 2185 | // It calls directly the NIC driver (WRITABLE command) and returns the status |
---|
| 2186 | // of the NIC_TX queue identified by the <chdev> argument. |
---|
| 2187 | // in the <writable> buffer. |
---|
| 2188 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2189 | // @ chdev : [in] local pointer on NIC_TX chdev. |
---|
| 2190 | // @ length : [in] packet length in bytes. |
---|
| 2191 | // @ writable : [out] zero if queue full. |
---|
| 2192 | // @ returns 0 if success / returns -1 if failure in accessing NIC device. |
---|
| 2193 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2194 | error_t dev_nic_tx_queue_writable( chdev_t * chdev, |
---|
| 2195 | uint32_t length, |
---|
| 2196 | uint32_t * writable ) |
---|
| 2197 | { |
---|
| 2198 | thread_t * this = CURRENT_THREAD; |
---|
| 2199 | |
---|
| 2200 | // initialize READABLE command in thread descriptor |
---|
| 2201 | this->nic_cmd.dev_xp = XPTR( local_cxy , chdev ); |
---|
| 2202 | this->nic_cmd.type = NIC_CMD_WRITABLE; |
---|
| 2203 | this->nic_cmd.length = length; |
---|
| 2204 | |
---|
[1] | 2205 | // call driver to test writable |
---|
[657] | 2206 | chdev->cmd( XPTR( local_cxy , this ) ); |
---|
[1] | 2207 | |
---|
[657] | 2208 | // return status |
---|
| 2209 | *writable = this->nic_cmd.status; |
---|
[1] | 2210 | |
---|
[657] | 2211 | // return error |
---|
| 2212 | return this->nic_cmd.error; |
---|
| 2213 | |
---|
| 2214 | } // end dev_nic_tx_queue_writable |
---|
| 2215 | |
---|
| 2216 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2217 | // This static function is called by the dev_nic_tx_server() function. |
---|
| 2218 | // It moves one ETH/IP/UDP packet from the kernel buffer identified by the <buffer> and |
---|
| 2219 | // <length> arguments to the NIC_TX_QUEUE identified the <chdev> argument. |
---|
| 2220 | // It calls directly the NIC driver, without registering in a waiting queue, because |
---|
| 2221 | // only this NIC_TX server thread can access this NIC_TX_QUEUE. |
---|
| 2222 | // 1) It checks NIC_TX_QUEUE status in a while loop, using the NIC_CMD_WRITABLE command. |
---|
| 2223 | // As long as the queue is not writable, it blocks and deschedules. It is re-activated |
---|
| 2224 | // by the NIC-TX ISR as soon as the queue changes status. |
---|
| 2225 | // 2) When the queue is writable, it put the ETH/IP/UDP packet into the NIC_TX_QUEUE, |
---|
| 2226 | // using the driver NIC_CMD_WRITE command. |
---|
| 2227 | // Both commands are successively registered in this NIC-TX server thread descriptor |
---|
| 2228 | // to be passed to the driver. |
---|
| 2229 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2230 | // @ chdev : [in] local pointer on NIC_TX chdev. |
---|
| 2231 | // @ buffer : [in] pointer on a local kernel buffer (2K bytes). |
---|
| 2232 | // @ length : [in] actual Ethernet packet length in bytes. |
---|
| 2233 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2234 | void dev_nic_tx_move_packet( chdev_t * chdev, |
---|
| 2235 | uint8_t * buffer, |
---|
| 2236 | uint32_t length ) |
---|
| 2237 | { |
---|
| 2238 | error_t error; |
---|
| 2239 | uint32_t writable; |
---|
| 2240 | |
---|
| 2241 | thread_t * this = CURRENT_THREAD; |
---|
| 2242 | |
---|
| 2243 | // get extended pointers on server tread and chdev |
---|
| 2244 | xptr_t thread_xp = XPTR( local_cxy , this ); |
---|
| 2245 | xptr_t chdev_xp = XPTR( local_cxy , chdev ); |
---|
| 2246 | |
---|
| 2247 | // get local pointer on core running this server thead |
---|
| 2248 | core_t * core = this->core; |
---|
| 2249 | |
---|
| 2250 | // check thread can yield |
---|
| 2251 | assert( (this->busylocks == 0), |
---|
| 2252 | "cannot yield : busylocks = %d\n", this->busylocks ); |
---|
| 2253 | |
---|
| 2254 | #if DEBUG_DEV_NIC_RX |
---|
| 2255 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
| 2256 | if( DEBUG_DEV_NIC_RX < cycle ) |
---|
| 2257 | printk("\n[%s] thread[%x,%x] enters for packet %x / cycle %d\n", |
---|
| 2258 | __FUNCTION__, this->process->pid, this->trdid, pkd, cycle ); |
---|
| 2259 | #endif |
---|
| 2260 | |
---|
| 2261 | // check NIC_TX_QUEUE writable |
---|
| 2262 | while( 1 ) |
---|
[1] | 2263 | { |
---|
[657] | 2264 | error = dev_nic_tx_queue_writable( chdev, |
---|
| 2265 | length, |
---|
| 2266 | &writable ); |
---|
| 2267 | if( error ) |
---|
| 2268 | { |
---|
| 2269 | printk("\n[PANIC] in %s : cannot access NIC_TX queue\n", __FUNCTION__ ); |
---|
| 2270 | return; |
---|
| 2271 | } |
---|
| 2272 | |
---|
| 2273 | if( writable == 0 ) // block & deschedule if non writable |
---|
| 2274 | { |
---|
| 2275 | // enable NIC-TX IRQ |
---|
| 2276 | dev_pic_enable_irq( core->lid , chdev_xp ); |
---|
[1] | 2277 | |
---|
[657] | 2278 | // block TX server thread |
---|
| 2279 | thread_block( thread_xp , THREAD_BLOCKED_ISR ); |
---|
[565] | 2280 | |
---|
[657] | 2281 | // deschedule TX server thread |
---|
| 2282 | sched_yield("client blocked on NIC_TX queue full"); |
---|
[1] | 2283 | |
---|
[657] | 2284 | // disable NIC-TX IRQ |
---|
| 2285 | dev_pic_disable_irq( core->lid , chdev_xp ); |
---|
| 2286 | } |
---|
| 2287 | else // exit loop if writable |
---|
| 2288 | { |
---|
| 2289 | break; |
---|
| 2290 | } |
---|
[1] | 2291 | } |
---|
| 2292 | |
---|
[657] | 2293 | // initialize WRITE command in server thread descriptor |
---|
| 2294 | this->nic_cmd.dev_xp = chdev_xp; |
---|
| 2295 | this->nic_cmd.type = NIC_CMD_WRITE; |
---|
| 2296 | this->nic_cmd.buffer = buffer; |
---|
| 2297 | this->nic_cmd.length = length; |
---|
[1] | 2298 | |
---|
[657] | 2299 | // call driver to move packet |
---|
| 2300 | chdev->cmd( thread_xp ); |
---|
[1] | 2301 | |
---|
[438] | 2302 | #if DEBUG_DEV_NIC_RX |
---|
[437] | 2303 | cycle = (uint32_t)hal_get_cycles(); |
---|
[438] | 2304 | if( DEBUG_DEV_NIC_RX < cycle ) |
---|
[657] | 2305 | printk("\n[%s] thread[%x,%x] exit for packet %x\n", |
---|
| 2306 | __FUNCTION__ , this->process->pid, this->trdid , pkd ); |
---|
[437] | 2307 | #endif |
---|
[1] | 2308 | |
---|
[657] | 2309 | return; |
---|
[1] | 2310 | |
---|
[657] | 2311 | } // end dev_nic_tx_move_packet() |
---|
[1] | 2312 | |
---|
[657] | 2313 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2314 | // This static function is called by the dev_nic_tx_server() function to build an UDP |
---|
| 2315 | // header in the kernel buffer defined by the <k_buf> arguement, as specified by the |
---|
| 2316 | // <socket_xp> argument. The <length> argument defines the number of bytes in payload. |
---|
| 2317 | // It set the "src_port", "dst_port", "total_length" and "checksum" fields in UDP header. |
---|
| 2318 | // The payload must be previouly loaded in the pernel buffer. |
---|
| 2319 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2320 | // @ k_buf : [in] pointer on first byte of UDP header in kernel buffer. |
---|
| 2321 | // @ socket_xp : [in] extended pointer on socket. |
---|
| 2322 | // @ length : [in] number of bytes in payload. |
---|
| 2323 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2324 | void dev_nic_tx_build_udp_header( uint8_t * k_buf, |
---|
| 2325 | xptr_t socket_xp, |
---|
| 2326 | uint32_t length ) |
---|
| 2327 | { |
---|
| 2328 | uint16_t checksum; // checksum value |
---|
| 2329 | uint32_t total_length; // total UDP packet length |
---|
| 2330 | uint32_t local_addr; // local IP address |
---|
| 2331 | uint32_t remote_addr; // remote IP address |
---|
| 2332 | uint32_t local_port; // local port |
---|
| 2333 | uint32_t remote_port; // remote port |
---|
[1] | 2334 | |
---|
[657] | 2335 | // get socket cluster an local pointer |
---|
| 2336 | socket_t * socket_ptr = GET_PTR( socket_xp ); |
---|
| 2337 | cxy_t socket_cxy = GET_CXY( socket_xp ); |
---|
| 2338 | |
---|
| 2339 | // get relevant infos from socket |
---|
| 2340 | local_addr = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->local_addr )); |
---|
| 2341 | remote_addr = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->remote_addr )); |
---|
| 2342 | local_port = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->local_port )); |
---|
| 2343 | remote_port = hal_remote_l32(XPTR(socket_cxy , &socket_ptr->remote_port )); |
---|
| 2344 | |
---|
| 2345 | // compute UDP packet total length |
---|
| 2346 | total_length = length + UDP_HEAD_LEN; |
---|
| 2347 | |
---|
| 2348 | // set src_port and dst_port in header |
---|
| 2349 | k_buf[0] = local_port >> 8; |
---|
| 2350 | k_buf[1] = local_port; |
---|
| 2351 | k_buf[2] = remote_port >> 8; |
---|
| 2352 | k_buf[3] = remote_port; |
---|
| 2353 | |
---|
| 2354 | // set packet length in header |
---|
| 2355 | k_buf[4] = total_length >> 8; |
---|
| 2356 | k_buf[5] = total_length; |
---|
| 2357 | |
---|
| 2358 | // compute UDP packet checksum |
---|
| 2359 | checksum = dev_nic_udp_checksum( k_buf , total_length ); |
---|
| 2360 | |
---|
| 2361 | // set checksum |
---|
| 2362 | k_buf[6] = checksum >> 8; |
---|
| 2363 | k_buf[7] = checksum; |
---|
| 2364 | |
---|
| 2365 | } // end dev_nic_tx_build_udp_header() |
---|
| 2366 | |
---|
| 2367 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2368 | // This static function is called by the dev_nic_tx_server() function. |
---|
| 2369 | // It builds a TCP header in the kernel buffer defined by the <k_buf> argument. |
---|
| 2370 | // The payload must have been previouly registered in this buffer. |
---|
| 2371 | // The "local_addr", "local_port", "remote_addr", "remote_port", seq_num", "ack_num", |
---|
| 2372 | // and "window" fields are obtained from the <socket_xp> argument. |
---|
| 2373 | // The <length> argument defines the number of bytes in payload, and the <flags> argument |
---|
| 2374 | // defines the flags to be set in TCP header. |
---|
| 2375 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2376 | // @ k_buf : [in] pointer on first byte of TCP header in kernel buffer. |
---|
| 2377 | // @ length : [in] number of bytes in payload. |
---|
| 2378 | // @ socket_xp : [in] extended pointer on socket. |
---|
| 2379 | // @ flags : [in] flags to be set in TCP header. |
---|
| 2380 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2381 | void dev_nic_tx_build_tcp_header( uint8_t * k_buf, |
---|
| 2382 | uint32_t length, |
---|
| 2383 | xptr_t socket_xp, |
---|
| 2384 | uint8_t flags ) |
---|
| 2385 | { |
---|
| 2386 | uint16_t checksum; // global segment checksum |
---|
| 2387 | uint32_t total_length; // total UDP packet length |
---|
| 2388 | uint32_t src_addr; // local IP address |
---|
| 2389 | uint32_t dst_addr; // remote IP address |
---|
| 2390 | uint16_t src_port; // local port |
---|
| 2391 | uint16_t dst_port; // remote port |
---|
| 2392 | uint32_t seq_num; // first byte of segment in TX stream |
---|
| 2393 | uint32_t ack_num; // next expected byte in RX stream |
---|
| 2394 | uint16_t window; // window of accepted segments in RX stream |
---|
| 2395 | |
---|
| 2396 | // get socket cluster an local pointer |
---|
| 2397 | socket_t * sock_ptr = GET_PTR( socket_xp ); |
---|
| 2398 | cxy_t sock_cxy = GET_CXY( socket_xp ); |
---|
| 2399 | |
---|
| 2400 | // get relevant infos from socket |
---|
| 2401 | src_addr = hal_remote_l32(XPTR( sock_cxy , &sock_ptr->local_addr )); |
---|
| 2402 | dst_addr = hal_remote_l32(XPTR( sock_cxy , &sock_ptr->remote_addr )); |
---|
| 2403 | src_port = hal_remote_l32(XPTR( sock_cxy , &sock_ptr->local_port )); |
---|
| 2404 | dst_port = hal_remote_l32(XPTR( sock_cxy , &sock_ptr->remote_port )); |
---|
| 2405 | seq_num = hal_remote_l32(XPTR( sock_cxy , &sock_ptr->tx_nxt )); |
---|
| 2406 | ack_num = hal_remote_l32(XPTR( sock_cxy , &sock_ptr->rx_nxt )); |
---|
| 2407 | window = hal_remote_l32(XPTR( sock_cxy , &sock_ptr->rx_wnd )); |
---|
| 2408 | |
---|
| 2409 | // compute TCP segment total length |
---|
| 2410 | total_length = length + TCP_HEAD_LEN; |
---|
| 2411 | |
---|
| 2412 | // set "src_port" and "dst_port" |
---|
| 2413 | k_buf[0] = src_port >> 8; |
---|
| 2414 | k_buf[1] = src_port; |
---|
| 2415 | k_buf[2] = dst_port >> 8; |
---|
| 2416 | k_buf[3] = dst_port; |
---|
| 2417 | |
---|
| 2418 | // set "seq_num" |
---|
| 2419 | k_buf[4] = seq_num >> 24; |
---|
| 2420 | k_buf[5] = seq_num >> 16; |
---|
| 2421 | k_buf[6] = seq_num >> 8; |
---|
| 2422 | k_buf[7] = seq_num; |
---|
| 2423 | |
---|
| 2424 | // set "ack_num" |
---|
| 2425 | k_buf[8] = ack_num >> 24; |
---|
| 2426 | k_buf[9] = ack_num >> 16; |
---|
| 2427 | k_buf[10] = ack_num >> 8; |
---|
| 2428 | k_buf[11] = ack_num; |
---|
| 2429 | |
---|
| 2430 | // set "hlen" |
---|
| 2431 | k_buf[12] = 5; |
---|
| 2432 | |
---|
| 2433 | // set "flags" |
---|
| 2434 | k_buf[13] = flags & 0x3F; |
---|
| 2435 | |
---|
| 2436 | // set "window" |
---|
| 2437 | k_buf[14] = window >> 8; |
---|
| 2438 | k_buf[15] = window; |
---|
| 2439 | |
---|
| 2440 | // reset "checksum" |
---|
| 2441 | k_buf[16] = 0; |
---|
| 2442 | k_buf[17] = 0; |
---|
| 2443 | |
---|
| 2444 | // set "urgent_ptr" |
---|
| 2445 | k_buf[18] = 0; |
---|
| 2446 | k_buf[19] = 0; |
---|
| 2447 | |
---|
| 2448 | // compute TCP segment checksum |
---|
| 2449 | checksum = dev_nic_tcp_checksum( k_buf, |
---|
| 2450 | total_length, |
---|
| 2451 | src_addr, |
---|
| 2452 | dst_addr ); |
---|
| 2453 | // set "checksum" |
---|
| 2454 | k_buf[16] = checksum >> 8; |
---|
| 2455 | k_buf[17] = checksum; |
---|
| 2456 | |
---|
| 2457 | } // end dev_nic_tx_build_tcp_header() |
---|
| 2458 | |
---|
| 2459 | |
---|
| 2460 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2461 | // This static function is called by the dev_nic_tx_server() function. |
---|
| 2462 | // It builds the IP header in the 20 first bytes of <buffer>. |
---|
| 2463 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2464 | // @ buffer : pointer on first byte of IP header in kernel buffer |
---|
| 2465 | // @ src_addr : source IP address. |
---|
| 2466 | // @ dst_addr : destination IP address. |
---|
| 2467 | // @ length : number of bytes in IP packet payload. |
---|
| 2468 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2469 | void dev_nic_tx_build_ip_header( uint8_t * buffer, |
---|
| 2470 | uint32_t src_addr, |
---|
| 2471 | uint32_t dst_addr, |
---|
| 2472 | uint16_t length ) |
---|
| 2473 | { |
---|
| 2474 | uint16_t hcs; |
---|
| 2475 | |
---|
| 2476 | uint16_t total = length + IP_HEAD_LEN; |
---|
| 2477 | |
---|
| 2478 | buffer[0] = 0x45; // IPV4 / IHL = 20 bytes |
---|
| 2479 | buffer[1] = 0; // DSCP / ECN |
---|
| 2480 | buffer[2] = total >> 8; |
---|
| 2481 | buffer[3] = total; |
---|
| 2482 | |
---|
| 2483 | buffer[4] = 0x40; // Don't Fragment |
---|
| 2484 | buffer[5] = 0; |
---|
| 2485 | buffer[6] = 0; |
---|
| 2486 | buffer[7] = 0; |
---|
| 2487 | |
---|
| 2488 | buffer[8] = 0xFF; // TTL |
---|
| 2489 | buffer[9] = 0x11; // UDP protocol |
---|
| 2490 | |
---|
| 2491 | buffer[12] = src_addr >> 24; |
---|
| 2492 | buffer[13] = src_addr >> 16; |
---|
| 2493 | buffer[14] = src_addr >> 8; |
---|
| 2494 | buffer[15] = src_addr; |
---|
| 2495 | |
---|
| 2496 | buffer[16] = dst_addr >> 24; |
---|
| 2497 | buffer[17] = dst_addr >> 16; |
---|
| 2498 | buffer[18] = dst_addr >> 8; |
---|
| 2499 | buffer[19] = dst_addr; |
---|
| 2500 | |
---|
| 2501 | // compute IP header checksum |
---|
| 2502 | hcs = dev_nic_ip_checksum( buffer ); |
---|
| 2503 | |
---|
| 2504 | // set checksum |
---|
| 2505 | buffer[10] = hcs >> 8; |
---|
| 2506 | buffer[11] = hcs; |
---|
| 2507 | |
---|
| 2508 | } // end dev_nic_tx_build_ip_header |
---|
| 2509 | |
---|
| 2510 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2511 | // This static function is called by the dev_nic_tx_server() function. |
---|
| 2512 | // It builds the Ethernet header in the 14 first bytes of <buffer>. |
---|
| 2513 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2514 | // @ buffer : pointer on first byte of Ethernet header in kernel buffer |
---|
| 2515 | // @ src_mac_54 : two MSB bytes in source MAC address. |
---|
| 2516 | // @ src_mac_32 : two MED bytes in source MAC address. |
---|
| 2517 | // @ src_mac_10 : two LSB bytes in source MAC address. |
---|
| 2518 | // @ dst_mac_54 : two MSB bytes in destination MAC address. |
---|
| 2519 | // @ dst_mac_32 : two MED bytes in destination MAC address. |
---|
| 2520 | // @ dst_mac_10 : two LSB bytes in destination MAC address. |
---|
| 2521 | // @ length : number of bytes in Ethernet frame payload. |
---|
| 2522 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2523 | void dev_nic_tx_build_eth_header( uint8_t * buffer, |
---|
| 2524 | uint16_t src_mac_54, |
---|
| 2525 | uint16_t src_mac_32, |
---|
| 2526 | uint16_t src_mac_10, |
---|
| 2527 | uint16_t dst_mac_54, |
---|
| 2528 | uint16_t dst_mac_32, |
---|
| 2529 | uint16_t dst_mac_10, |
---|
| 2530 | uint32_t length ) |
---|
| 2531 | { |
---|
| 2532 | buffer[0] = dst_mac_54 >> 8; |
---|
| 2533 | buffer[1] = dst_mac_54; |
---|
| 2534 | buffer[2] = dst_mac_32 >> 8; |
---|
| 2535 | buffer[3] = dst_mac_32; |
---|
| 2536 | buffer[4] = dst_mac_10 >> 8; |
---|
| 2537 | buffer[5] = dst_mac_10; |
---|
| 2538 | |
---|
| 2539 | buffer[6] = src_mac_54 >> 8; |
---|
| 2540 | buffer[7] = src_mac_54; |
---|
| 2541 | buffer[8] = src_mac_32 >> 8; |
---|
| 2542 | buffer[9] = src_mac_32; |
---|
| 2543 | buffer[10] = src_mac_10 >> 8; |
---|
| 2544 | buffer[11] = src_mac_10; |
---|
| 2545 | |
---|
| 2546 | buffer[12] = length >> 8; |
---|
| 2547 | buffer[13] = length; |
---|
| 2548 | |
---|
| 2549 | } // end dev_nic_tx_build_eth_header() |
---|
| 2550 | |
---|
| 2551 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2552 | // This static function is called by the dev_nic_tx_server() function to handle one |
---|
| 2553 | // TX command, or one R2T request, registered in the socket identified by the <socket_xp> |
---|
| 2554 | // argument. If there is one valid command, or if the R2T queue is non empty (for a TCP |
---|
| 2555 | // socket), it builds an ETH/IP/UDP packet (or a ETH/IP/TCP segment), in the buffer |
---|
| 2556 | // defined by the <k_buf> argument, and registers it in the NIC_TX queue defined by the |
---|
| 2557 | // <chdev> argument. The supported commands are SOCKET_SEND/SOCKET_CONNECT/SOCKET_CLOSE. |
---|
| 2558 | // It unblocks the client thread when the command is completed. |
---|
| 2559 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2560 | // When there is a packet to send, it makes the following actions: |
---|
| 2561 | // 1) it takes the lock protecting the socket state. |
---|
| 2562 | // 2) it get the command arguments from client thread descriptor. |
---|
| 2563 | // 3) it build an UDP packet or a TCP segment, depending on both the command type, and |
---|
| 2564 | // the socket state, updates the socket state, and unblocks the client thread. |
---|
| 2565 | // 4) it release the lock protecting the socket. |
---|
| 2566 | // 5) it build the IP header. |
---|
| 2567 | // 6) it build the ETH header. |
---|
| 2568 | // 7) it copies the packet in the NIC_TX queue. |
---|
| 2569 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2570 | // @ socket_xp : [in] extended pointer on client socket. |
---|
| 2571 | // @ k_buf : [in] local pointer on kernel buffer (2 Kbytes). |
---|
| 2572 | // @ chdev : [in] local pointer on NIC_RX chdev. |
---|
| 2573 | /////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2574 | static void dev_nic_tx_handle_one_cmd( xptr_t socket_xp, |
---|
| 2575 | uint8_t * k_buf, |
---|
| 2576 | chdev_t * chdev ) |
---|
| 2577 | { |
---|
| 2578 | socket_t * socket_ptr; |
---|
| 2579 | cxy_t socket_cxy; |
---|
| 2580 | xptr_t client_xp; // extended pointer on client thread |
---|
| 2581 | thread_t * client_ptr; |
---|
| 2582 | cxy_t client_cxy; |
---|
| 2583 | sock_cmd_t cmd; // NIC command type |
---|
| 2584 | uint8_t * buf; // pointer on user buffer |
---|
| 2585 | uint32_t len; // user buffer length |
---|
| 2586 | uint32_t todo; // number of bytes not yet sent |
---|
| 2587 | uint32_t socket_type; // socket type (UDP/TCP) |
---|
| 2588 | uint32_t socket_state; // socket state |
---|
| 2589 | xptr_t socket_lock_xp; // extended pointer on socket lock |
---|
| 2590 | xptr_t socket_r2tq_xp; // extended pointer on R2T queue |
---|
| 2591 | uint32_t src_ip_addr; // source IP address |
---|
| 2592 | uint32_t dst_ip_addr; // destination IP address |
---|
| 2593 | uint32_t tx_una; // next byte to be sent |
---|
| 2594 | uint32_t tx_nxt; // first unacknowledged byte |
---|
| 2595 | uint32_t nbytes; // number of bytes in UDP/TCP packet payload |
---|
| 2596 | uint8_t * k_base; // pointer UDP/TCP packet in kernel buffer |
---|
| 2597 | uint32_t trsp_length; // length of TCP/UDP packet |
---|
| 2598 | uint8_t r2t_flags; // flags defined by one R2T queue request |
---|
| 2599 | bool_t do_send; // build & send a packet when true |
---|
| 2600 | |
---|
| 2601 | // get socket cluster and local pointer |
---|
| 2602 | socket_cxy = GET_CXY( socket_xp ); |
---|
| 2603 | socket_ptr = GET_PTR( socket_xp ); |
---|
| 2604 | |
---|
| 2605 | // build extended pointer on socket lock and r2t queue |
---|
| 2606 | socket_lock_xp = XPTR( socket_cxy , &socket_ptr->lock ); |
---|
| 2607 | socket_r2tq_xp = XPTR( socket_cxy , &socket_ptr->r2tq ); |
---|
| 2608 | |
---|
| 2609 | // 1. take lock protecting this socket |
---|
| 2610 | remote_rwlock_wr_acquire( socket_lock_xp ); |
---|
| 2611 | |
---|
| 2612 | // get pointers on TX client thread from socket |
---|
| 2613 | client_xp = hal_remote_l64( XPTR( socket_cxy , &socket_ptr->tx_client )); |
---|
| 2614 | client_cxy = GET_CXY( client_xp ); |
---|
| 2615 | client_ptr = GET_PTR( client_xp ); |
---|
| 2616 | |
---|
| 2617 | // check valid command |
---|
| 2618 | if( client_xp != XPTR_NULL ) // valid command found |
---|
| 2619 | { |
---|
| 2620 | // 2. get command arguments from socket |
---|
| 2621 | cmd = hal_remote_l32( XPTR(socket_cxy , &socket_ptr->tx_cmd )); |
---|
| 2622 | buf = hal_remote_lpt( XPTR(socket_cxy , &socket_ptr->tx_buf )); |
---|
| 2623 | len = hal_remote_l32( XPTR(socket_cxy , &socket_ptr->tx_len )); |
---|
| 2624 | todo = hal_remote_l32( XPTR(socket_cxy , &socket_ptr->tx_todo )); |
---|
| 2625 | |
---|
| 2626 | // get socket type and state |
---|
| 2627 | socket_type = hal_remote_l32( XPTR(socket_cxy , &socket_ptr->type )); |
---|
| 2628 | socket_state = hal_remote_l32( XPTR(socket_cxy , &socket_ptr->state )); |
---|
| 2629 | |
---|
| 2630 | // 3. UDP : build UDP packet and update UDP socket state |
---|
| 2631 | if( socket_type == SOCK_DGRAM ) |
---|
| 2632 | { |
---|
| 2633 | if( socket_state == UDP_STATE_UNBOUND ) |
---|
| 2634 | { |
---|
| 2635 | // report illegal command |
---|
| 2636 | dev_nic_tx_report_error( socket_xp, cmd, socket_state ); |
---|
| 2637 | |
---|
| 2638 | do_send = false; |
---|
| 2639 | } |
---|
| 2640 | else // BOUND or CONNECT state |
---|
| 2641 | { |
---|
| 2642 | if( cmd == SOCKET_TX_SEND ) |
---|
| 2643 | { |
---|
| 2644 | // compute payload length |
---|
| 2645 | nbytes = ( PAYLOAD_MAX_LEN < todo ) ? PAYLOAD_MAX_LEN : todo; |
---|
| 2646 | |
---|
| 2647 | // compute UDP packet base in kernel buffer |
---|
| 2648 | k_base = k_buf + ETH_HEAD_LEN + IP_HEAD_LEN; |
---|
| 2649 | |
---|
| 2650 | // move payload to kernel buffer |
---|
| 2651 | hal_copy_from_uspace( XPTR(local_cxy , k_base + UDP_HEAD_LEN ), |
---|
| 2652 | buf + (len - todo), |
---|
| 2653 | nbytes ); |
---|
| 2654 | // build UDP header |
---|
| 2655 | dev_nic_tx_build_udp_header( k_base, |
---|
| 2656 | socket_xp, |
---|
| 2657 | nbytes ); |
---|
| 2658 | |
---|
| 2659 | // update "tx_todo" in socket descriptor |
---|
| 2660 | hal_remote_s32( XPTR(socket_cxy , socket_ptr->tx_todo), |
---|
| 2661 | todo - nbytes ); |
---|
| 2662 | |
---|
| 2663 | // unblock client thread when SEND command completed |
---|
| 2664 | if( nbytes == todo ) |
---|
| 2665 | { |
---|
| 2666 | dev_nic_tx_report_success( socket_xp ); |
---|
| 2667 | } |
---|
| 2668 | |
---|
| 2669 | do_send = true; |
---|
| 2670 | } |
---|
| 2671 | else |
---|
| 2672 | { |
---|
| 2673 | // report illegal command |
---|
| 2674 | dev_nic_tx_report_error( socket_xp, cmd, socket_state ); |
---|
| 2675 | |
---|
| 2676 | do_send = false; |
---|
| 2677 | } |
---|
| 2678 | } |
---|
| 2679 | |
---|
| 2680 | // compute transport packet length |
---|
| 2681 | trsp_length = UDP_HEAD_LEN + nbytes; |
---|
| 2682 | |
---|
| 2683 | } // end UDP |
---|
| 2684 | |
---|
| 2685 | // 3. TCP : build TCP segment and update TCP socket state |
---|
| 2686 | if( socket_type == SOCK_STREAM ) |
---|
| 2687 | { |
---|
| 2688 | // extract one request from TCP socket R2T queue if queue non empty |
---|
| 2689 | if( remote_buf_status( socket_r2tq_xp ) ) |
---|
| 2690 | { |
---|
| 2691 | remote_buf_get_to_kernel( socket_r2tq_xp , &r2t_flags , 1 ); |
---|
| 2692 | } |
---|
| 2693 | else |
---|
| 2694 | { |
---|
| 2695 | r2t_flags = 0; |
---|
| 2696 | } |
---|
| 2697 | |
---|
| 2698 | ///////////////////////////////////// |
---|
| 2699 | if( socket_state == TCP_STATE_ESTAB ) // connected TCP socket |
---|
| 2700 | { |
---|
| 2701 | if( cmd == SOCKET_TX_SEND ) |
---|
| 2702 | { |
---|
| 2703 | // get "tx_nxt", and "tx_una" from socket descriptor |
---|
| 2704 | tx_nxt = hal_remote_l32( XPTR(socket_cxy , &socket_ptr->tx_nxt )); |
---|
| 2705 | tx_una = hal_remote_l32( XPTR(socket_cxy , &socket_ptr->tx_una )); |
---|
| 2706 | |
---|
| 2707 | // compute actual payload length |
---|
| 2708 | nbytes = ( PAYLOAD_MAX_LEN < todo ) ? PAYLOAD_MAX_LEN : todo; |
---|
| 2709 | |
---|
| 2710 | // compute TCP segment base in kernel buffer |
---|
| 2711 | k_base = k_buf + ETH_HEAD_LEN + IP_HEAD_LEN; |
---|
| 2712 | |
---|
| 2713 | // move payload to kernel buffer |
---|
| 2714 | hal_copy_from_uspace( XPTR( local_cxy , k_base + TCP_HEAD_LEN ), |
---|
| 2715 | buf + (len - todo), |
---|
| 2716 | nbytes ); |
---|
| 2717 | |
---|
| 2718 | // build TCP header |
---|
| 2719 | dev_nic_tx_build_tcp_header( k_base, |
---|
| 2720 | socket_xp, |
---|
| 2721 | nbytes, // payload |
---|
| 2722 | TCP_FLAG_ACK | r2t_flags ); // flags |
---|
| 2723 | |
---|
| 2724 | // update "tx_todo" in socket descriptor |
---|
| 2725 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_todo ), |
---|
| 2726 | todo - nbytes ); |
---|
| 2727 | |
---|
| 2728 | // update "tx_nxt" in socket descriptor |
---|
| 2729 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_nxt ), |
---|
| 2730 | tx_nxt + nbytes ); |
---|
| 2731 | |
---|
| 2732 | // unblock client thread when SEND command completed |
---|
| 2733 | if( (todo == 0) && (tx_nxt == tx_una) ) |
---|
| 2734 | { |
---|
| 2735 | dev_nic_tx_report_success( socket_xp ); |
---|
| 2736 | } |
---|
| 2737 | |
---|
| 2738 | do_send = true; |
---|
| 2739 | } |
---|
| 2740 | else if( cmd == SOCKET_TX_CLOSE ) |
---|
| 2741 | { |
---|
| 2742 | // build TCP FIN segment |
---|
| 2743 | dev_nic_tx_build_tcp_header( k_base, |
---|
| 2744 | socket_xp, |
---|
| 2745 | 0, // payload |
---|
| 2746 | TCP_FLAG_FIN | r2t_flags ); // flags |
---|
| 2747 | // update socket state |
---|
| 2748 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 2749 | TCP_STATE_FIN_WAIT1 ); |
---|
| 2750 | |
---|
| 2751 | do_send = true; |
---|
| 2752 | } |
---|
| 2753 | else // cmd == CONNECT |
---|
| 2754 | { |
---|
| 2755 | // report illegal command |
---|
| 2756 | dev_nic_tx_report_error( socket_xp , cmd , socket_state ); |
---|
| 2757 | |
---|
| 2758 | do_send = false; |
---|
| 2759 | } |
---|
| 2760 | } |
---|
| 2761 | ////////////////////////////////////////// |
---|
| 2762 | else if( socket_state == TCP_STATE_BOUND ) // unconnected TCP socket |
---|
| 2763 | { |
---|
| 2764 | if ( cmd == SOCKET_TX_CONNECT ) |
---|
| 2765 | { |
---|
| 2766 | // set socket.tx_nxt |
---|
| 2767 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_nxt ), |
---|
| 2768 | TCP_ISS ); |
---|
| 2769 | |
---|
| 2770 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_nxt ), 0 ); |
---|
| 2771 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->rx_wnd ), |
---|
| 2772 | NIC_RX_BUF_SIZE); |
---|
| 2773 | |
---|
| 2774 | // build TCP SYN segment |
---|
| 2775 | dev_nic_tx_build_tcp_header( k_base, |
---|
| 2776 | socket_xp, |
---|
| 2777 | 0, // payload |
---|
| 2778 | TCP_FLAG_SYN ); // flags |
---|
| 2779 | // update socket state |
---|
| 2780 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 2781 | TCP_STATE_SYN_SENT ); |
---|
| 2782 | |
---|
| 2783 | do_send = true; |
---|
| 2784 | } |
---|
| 2785 | else // cmd == SEND / CLOSE |
---|
| 2786 | { |
---|
| 2787 | // report illegal command |
---|
| 2788 | dev_nic_tx_report_error( socket_xp, cmd, socket_state ); |
---|
| 2789 | |
---|
| 2790 | do_send = false; |
---|
| 2791 | } |
---|
| 2792 | } |
---|
| 2793 | /////////////////////////////////////////// |
---|
| 2794 | else if( socket_state == TCP_STATE_LISTEN ) // server wait connect |
---|
| 2795 | { |
---|
| 2796 | if( cmd == SOCKET_TX_CONNECT ) |
---|
| 2797 | { |
---|
| 2798 | // update socket.state |
---|
| 2799 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 2800 | TCP_STATE_SYN_SENT ); |
---|
| 2801 | |
---|
| 2802 | // set socket.tx_una |
---|
| 2803 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_una ), |
---|
| 2804 | TCP_ISS ); |
---|
| 2805 | |
---|
| 2806 | // set socket.tx_nxt |
---|
| 2807 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->tx_una ), |
---|
| 2808 | TCP_ISS + 1 ); |
---|
| 2809 | |
---|
| 2810 | // build TCP SYN segment |
---|
| 2811 | dev_nic_tx_build_tcp_header( k_base, |
---|
| 2812 | socket_xp, |
---|
| 2813 | 0, // payload |
---|
| 2814 | TCP_FLAG_SYN ); // flags |
---|
| 2815 | do_send = true; |
---|
| 2816 | } |
---|
| 2817 | else // cmd == CLOSE / SEND |
---|
| 2818 | { |
---|
| 2819 | // report illegal command |
---|
| 2820 | dev_nic_tx_report_error( socket_xp, cmd, socket_state ); |
---|
| 2821 | |
---|
| 2822 | do_send = false; |
---|
| 2823 | } |
---|
| 2824 | } |
---|
| 2825 | ///////////////////////////////////////////// |
---|
| 2826 | else if( socket_state == TCP_STATE_SYN_RCVD ) // socket wait ACK |
---|
| 2827 | { |
---|
| 2828 | if( cmd == SOCKET_TX_CLOSE ) |
---|
| 2829 | { |
---|
| 2830 | // build TCP FIN segment |
---|
| 2831 | dev_nic_tx_build_tcp_header( k_base, |
---|
| 2832 | socket_xp, |
---|
| 2833 | 0, // payload |
---|
| 2834 | TCP_FLAG_FIN ); // flags |
---|
| 2835 | // update socket state |
---|
| 2836 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 2837 | TCP_STATE_FIN_WAIT1 ); |
---|
| 2838 | |
---|
| 2839 | do_send = true; |
---|
| 2840 | } |
---|
| 2841 | else // SEND / CONNECT |
---|
| 2842 | { |
---|
| 2843 | // report illegal command |
---|
| 2844 | dev_nic_tx_report_error( socket_xp, cmd, socket_state ); |
---|
| 2845 | |
---|
| 2846 | do_send = false; |
---|
| 2847 | } |
---|
| 2848 | } |
---|
| 2849 | //////////////////////////////////////////////// |
---|
| 2850 | else if( socket_state == TCP_STATE_CLOSE_WAIT ) // wait local close() |
---|
| 2851 | { |
---|
| 2852 | if( cmd == SOCKET_TX_CLOSE ) |
---|
| 2853 | { |
---|
| 2854 | // build TCP FIN segment |
---|
| 2855 | dev_nic_tx_build_tcp_header( k_base, |
---|
| 2856 | socket_xp, |
---|
| 2857 | 0, // payload |
---|
| 2858 | TCP_FLAG_FIN ); // flags |
---|
| 2859 | // update socket state |
---|
| 2860 | hal_remote_s32( XPTR( socket_cxy , &socket_ptr->state ), |
---|
| 2861 | TCP_STATE_LAST_ACK ); |
---|
| 2862 | |
---|
| 2863 | do_send = true; |
---|
| 2864 | } |
---|
| 2865 | else // SEND / CONNECT |
---|
| 2866 | { |
---|
| 2867 | // report illegal command |
---|
| 2868 | dev_nic_tx_report_error( socket_xp, cmd, socket_state ); |
---|
| 2869 | |
---|
| 2870 | do_send = false; |
---|
| 2871 | } |
---|
| 2872 | } |
---|
| 2873 | //// |
---|
| 2874 | else |
---|
| 2875 | { |
---|
| 2876 | // report illegal command |
---|
| 2877 | dev_nic_tx_report_error( socket_xp, cmd, socket_state ); |
---|
| 2878 | |
---|
| 2879 | do_send = false; |
---|
| 2880 | } |
---|
| 2881 | |
---|
| 2882 | // compute TCP segment length |
---|
| 2883 | trsp_length = TCP_HEAD_LEN + nbytes; |
---|
| 2884 | } |
---|
| 2885 | } |
---|
| 2886 | else // no valid command found |
---|
| 2887 | { |
---|
| 2888 | if( socket_type == SOCK_DGRAM ) // UDP socket |
---|
| 2889 | { |
---|
| 2890 | do_send = false; |
---|
| 2891 | } |
---|
| 2892 | else // TCP socket |
---|
| 2893 | { |
---|
| 2894 | if( remote_buf_status( socket_r2tq_xp ) == 0 ) // R2T queue empty |
---|
| 2895 | { |
---|
| 2896 | do_send = false; |
---|
| 2897 | } |
---|
| 2898 | else // pending request in R2T queue |
---|
| 2899 | { |
---|
| 2900 | // get one request from R2T queue |
---|
| 2901 | remote_buf_get_to_kernel( socket_r2tq_xp , &r2t_flags , 1 ); |
---|
| 2902 | |
---|
| 2903 | // build TCP header for an empty segment |
---|
| 2904 | dev_nic_tx_build_tcp_header( k_base, |
---|
| 2905 | socket_xp, |
---|
| 2906 | 0, // payload |
---|
| 2907 | r2t_flags ); // flags |
---|
| 2908 | do_send = true; |
---|
| 2909 | } |
---|
| 2910 | } |
---|
| 2911 | } |
---|
| 2912 | |
---|
| 2913 | // 4. release the lock protecting the socket |
---|
| 2914 | remote_rwlock_wr_release( socket_lock_xp ); |
---|
| 2915 | |
---|
| 2916 | // return if no packet to send |
---|
| 2917 | if( do_send == false ) return; |
---|
| 2918 | |
---|
| 2919 | // 5. build IP header |
---|
| 2920 | dev_nic_tx_build_ip_header( k_buf + ETH_HEAD_LEN, |
---|
| 2921 | src_ip_addr, |
---|
| 2922 | dst_ip_addr, |
---|
| 2923 | IP_HEAD_LEN + trsp_length ); |
---|
| 2924 | |
---|
| 2925 | // 6. build ETH header |
---|
| 2926 | dev_nic_tx_build_eth_header( k_buf, |
---|
| 2927 | (uint16_t)SRC_MAC_54, |
---|
| 2928 | (uint16_t)SRC_MAC_32, |
---|
| 2929 | (uint16_t)SRC_MAC_10, |
---|
| 2930 | (uint16_t)DST_MAC_54, |
---|
| 2931 | (uint16_t)DST_MAC_32, |
---|
| 2932 | (uint16_t)DST_MAC_10, |
---|
| 2933 | ETH_HEAD_LEN + IP_HEAD_LEN + trsp_length ); |
---|
| 2934 | |
---|
| 2935 | // 7. move packet to NIC_TX queue |
---|
| 2936 | dev_nic_tx_move_packet( chdev, |
---|
| 2937 | k_buf, |
---|
| 2938 | ETH_HEAD_LEN + IP_HEAD_LEN + trsp_length ); |
---|
| 2939 | |
---|
| 2940 | } // end dev_nic_tx_handle_one_cmd() |
---|
| 2941 | |
---|
| 2942 | ///////////////////////////////////////// |
---|
| 2943 | void dev_nic_tx_server( chdev_t * chdev ) |
---|
| 2944 | { |
---|
| 2945 | uint8_t k_buf[NIC_KERNEL_BUF_SIZE]; // buffer for one packet |
---|
| 2946 | |
---|
| 2947 | xptr_t root_xp; // extended pointer on clients list root |
---|
| 2948 | xptr_t lock_xp; // extended pointer on lock protecting this list |
---|
| 2949 | xptr_t socket_xp; // extended pointer on on client socket |
---|
| 2950 | socket_t * socket_ptr; |
---|
| 2951 | cxy_t socket_cxy; |
---|
| 2952 | xptr_t entry_xp; // extended pointer on socket tx_list entry |
---|
| 2953 | |
---|
| 2954 | thread_t * this = CURRENT_THREAD; |
---|
| 2955 | |
---|
| 2956 | // check chdev direction and type |
---|
| 2957 | assert( (chdev->func == DEV_FUNC_NIC) && (chdev->is_rx == false) , |
---|
| 2958 | "illegal chdev type or direction" ); |
---|
| 2959 | |
---|
| 2960 | // check thread can yield |
---|
| 2961 | assert( (this->busylocks == 0), |
---|
| 2962 | "cannot yield : busylocks = %d\n", this->busylocks ); |
---|
| 2963 | |
---|
| 2964 | // build extended pointer on client sockets lock & root |
---|
| 2965 | lock_xp = XPTR( local_cxy , &chdev->wait_lock ); |
---|
| 2966 | root_xp = XPTR( local_cxy , &chdev->wait_root ); |
---|
| 2967 | |
---|
| 2968 | while( 1 ) // TX server infinite loop |
---|
| 2969 | { |
---|
| 2970 | // take the lock protecting the client sockets queue |
---|
| 2971 | remote_busylock_acquire( lock_xp ); |
---|
| 2972 | |
---|
| 2973 | /////////////// block and deschedule if no clients |
---|
| 2974 | if( xlist_is_empty( root_xp ) == false ) |
---|
| 2975 | { |
---|
| 2976 | // release the lock protecting the TX client sockets queue |
---|
| 2977 | remote_busylock_release( lock_xp ); |
---|
| 2978 | |
---|
| 2979 | // block and deschedule |
---|
| 2980 | thread_block( XPTR( local_cxy , this ) , THREAD_BLOCKED_CLIENT ); |
---|
| 2981 | sched_yield( "waiting client" ); |
---|
| 2982 | } |
---|
| 2983 | ////////////// |
---|
| 2984 | else |
---|
| 2985 | { |
---|
| 2986 | // get first client socket |
---|
| 2987 | socket_xp = XLIST_FIRST( root_xp , socket_t , tx_list ); |
---|
| 2988 | socket_cxy = GET_CXY( socket_xp ); |
---|
| 2989 | socket_ptr = GET_PTR( socket_xp ); |
---|
| 2990 | |
---|
| 2991 | // build extended pointer on socket xlist_entry |
---|
| 2992 | entry_xp = XPTR( socket_cxy , &socket_ptr->tx_list ); |
---|
| 2993 | |
---|
| 2994 | // remove this socket from the waiting queue |
---|
| 2995 | xlist_unlink( entry_xp ); |
---|
| 2996 | |
---|
| 2997 | // release the lock protecting the client sockets queue |
---|
| 2998 | remote_busylock_release( lock_xp ); |
---|
| 2999 | |
---|
| 3000 | // handle this TX client |
---|
| 3001 | dev_nic_tx_handle_one_cmd( socket_xp, |
---|
| 3002 | k_buf, |
---|
| 3003 | chdev ); |
---|
| 3004 | |
---|
| 3005 | // take the lock protecting the client sockets queue |
---|
| 3006 | remote_busylock_acquire( lock_xp ); |
---|
| 3007 | |
---|
| 3008 | // add this socket in last position of queue |
---|
| 3009 | xlist_add_last( root_xp , entry_xp ); |
---|
| 3010 | |
---|
| 3011 | // release the lock protecting the client sockets queue |
---|
| 3012 | remote_busylock_release( lock_xp ); |
---|
| 3013 | } |
---|
| 3014 | } // end while |
---|
| 3015 | } // end dev_nic_tx_server() |
---|
| 3016 | |
---|
| 3017 | |
---|