[528] | 1 | /* -*- c++ -*- |
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| 2 | * |
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| 3 | * SOCLIB_LGPL_HEADER_BEGIN |
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| 4 | * |
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| 5 | * This file is part of SoCLib, GNU LGPLv2.1. |
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| 6 | * |
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| 7 | * SoCLib is free software; you can redistribute it and/or modify it |
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| 8 | * under the terms of the GNU Lesser General Public License as published |
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| 9 | * by the Free Software Foundation; version 2.1 of the License. |
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| 10 | * |
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| 11 | * SoCLib is distributed in the hope that it will be useful, but |
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| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with SoCLib; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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| 19 | * 02110-1301 USA |
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| 20 | * |
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| 21 | * SOCLIB_LGPL_HEADER_END |
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| 22 | * |
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| 23 | * Copyright (c) Telecom ParisTech |
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| 24 | * Alexandre Becoulet <alexandre.becoulet@enst.fr>, 2012 |
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| 25 | * |
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| 26 | * Maintainers: becoulet |
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| 27 | */ |
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| 28 | |
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| 29 | #include <unistd.h> |
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| 30 | #include <stdint.h> |
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| 31 | #include <fcntl.h> |
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| 32 | #include <string.h> |
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| 33 | #include <errno.h> |
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| 34 | |
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| 35 | #include <iostream> |
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| 36 | |
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| 37 | #include "register.h" |
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| 38 | #include "../include/vci_ethernet.h" |
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| 39 | #include "ethernet.h" |
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| 40 | |
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| 41 | #define CHUNCK_SIZE (64) // Width of a cache line |
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| 42 | #define CHUNCK_MASK ((~0ULL) << (6)) // MASK of a cache line |
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| 43 | |
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| 44 | //#define SOCLIB_MODULE_DEBUG |
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| 45 | |
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| 46 | namespace soclib { namespace caba { |
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| 47 | |
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| 48 | #define tmpl(t) template<typename vci_param> t VciEthernet<vci_param> |
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| 49 | |
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| 50 | tmpl(bool)::on_write(int seg, typename vci_param::addr_t addr, typename vci_param::data_t data, int be) |
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| 51 | { |
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| 52 | int cell = (int)addr / vci_param::B; |
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| 53 | |
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| 54 | #ifdef SOCLIB_MODULE_DEBUG |
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| 55 | std::cout |
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| 56 | << name() |
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| 57 | << ": write config register " |
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| 58 | << cell |
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| 59 | << " with data 0x" |
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| 60 | << std::hex << data |
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| 61 | << std::dec |
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| 62 | << std::endl; |
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| 63 | #endif |
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| 64 | |
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| 65 | fifo_entry_t *f; |
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| 66 | |
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| 67 | switch ((enum SoclibEthernetRegisters)cell) |
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| 68 | { |
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| 69 | case ETHERNET_TX_SIZE: |
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| 70 | _tx_size = std::min((int)data, VCI_ETHERNET_MAX_PKT_SIZE); |
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| 71 | return true; |
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| 72 | |
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| 73 | case ETHERNET_TX_FIFO: |
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| 74 | if (_tx_count >= VCI_ETHERNET_FIFO_SIZE) { |
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| 75 | std::cout << name() << ": TX fifo full, can not push more packets!" << std::endl; |
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| 76 | return false; |
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| 77 | } |
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| 78 | |
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| 79 | f = _tx_fifo + (_tx_start + _tx_count++) % VCI_ETHERNET_FIFO_SIZE; |
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| 80 | _tx_waiting++; |
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| 81 | |
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| 82 | f->addr = data; |
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| 83 | f->size = _tx_size; |
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| 84 | f->status = 0; |
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| 85 | f->data = (uint8_t*)malloc(_tx_size); |
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| 86 | return true; |
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| 87 | |
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| 88 | case ETHERNET_RX_SIZE: |
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| 89 | _rx_size = std::min((int)data, VCI_ETHERNET_MAX_PKT_SIZE); |
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| 90 | return true; |
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| 91 | |
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| 92 | case ETHERNET_RX_FIFO: |
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| 93 | if (_rx_count >= VCI_ETHERNET_FIFO_SIZE) { |
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| 94 | std::cout << name() << ": RX fifo full, can not push more packet buffers!" << std::endl; |
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| 95 | return false; |
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| 96 | } |
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| 97 | |
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| 98 | f = _rx_fifo + (_rx_start + _rx_count++) % VCI_ETHERNET_FIFO_SIZE; |
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| 99 | _rx_free++; |
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| 100 | |
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| 101 | f->addr = data; |
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| 102 | f->size = _rx_size; |
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| 103 | f->status = 0; |
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| 104 | f->data = (uint8_t*)malloc(_rx_size); |
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| 105 | return true; |
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| 106 | |
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| 107 | case ETHERNET_CTRL: |
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| 108 | if (data & ETHERNET_CTRL_RESET) |
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| 109 | _soft_reset = true; |
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| 110 | if (data & ETHERNET_CTRL_TX_IRQ) |
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| 111 | _tx_irq_en = true; |
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| 112 | else |
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| 113 | _tx_irq_en = false; |
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| 114 | if (data & ETHERNET_CTRL_RX_IRQ) |
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| 115 | _rx_irq_en = true; |
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| 116 | else |
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| 117 | _rx_irq_en = false; |
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| 118 | if (data & ETHERNET_CTRL_LINK_IRQ) |
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| 119 | _link_irq_en = true; |
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| 120 | else |
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| 121 | _link_irq_en = false; |
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| 122 | return true; |
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| 123 | |
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| 124 | default: |
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| 125 | return false; |
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| 126 | } |
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| 127 | } |
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| 128 | |
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| 129 | tmpl(bool)::on_read(int seg, typename vci_param::addr_t addr, typename vci_param::data_t &data) |
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| 130 | { |
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| 131 | int cell = (int)addr / vci_param::B; |
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| 132 | |
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| 133 | #ifdef SOCLIB_MODULE_DEBUG |
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| 134 | std::cout |
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| 135 | << name() |
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| 136 | << ": read config register " |
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| 137 | << cell |
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| 138 | << std::endl; |
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| 139 | #endif |
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| 140 | |
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| 141 | fifo_entry_t *f; |
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| 142 | |
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| 143 | switch ((enum SoclibEthernetRegisters)cell) { |
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| 144 | case ETHERNET_TX_FIFO: |
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| 145 | if (_tx_done == 0) { |
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| 146 | data = 0; |
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| 147 | } else { |
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| 148 | f = _tx_fifo + _tx_start++ % VCI_ETHERNET_FIFO_SIZE; |
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| 149 | _tx_count--; |
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| 150 | _tx_done--; |
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| 151 | data = f->status; |
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| 152 | free(f->data); |
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| 153 | } |
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| 154 | return true; |
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| 155 | |
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| 156 | case ETHERNET_RX_SIZE: |
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| 157 | if (_rx_done == 0) { |
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| 158 | data = 0; |
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| 159 | } else { |
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| 160 | f = _rx_fifo + _rx_start % VCI_ETHERNET_FIFO_SIZE; |
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| 161 | data = f->size; |
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| 162 | } |
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| 163 | return true; |
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| 164 | |
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| 165 | case ETHERNET_RX_FIFO: |
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| 166 | if (_rx_done == 0) { |
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| 167 | data = 0; |
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| 168 | } else { |
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| 169 | f = _rx_fifo + _rx_start++ % VCI_ETHERNET_FIFO_SIZE; |
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| 170 | _rx_count--; |
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| 171 | _rx_done--; |
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| 172 | free(f->data); |
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| 173 | data = f->status; |
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| 174 | } |
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| 175 | return true; |
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| 176 | |
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| 177 | case ETHERNET_STATUS: |
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| 178 | data = 0; |
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| 179 | _link_changed = false; |
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| 180 | if (_link_up) |
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| 181 | data |= ETHERNET_ST_LINK_UP; |
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| 182 | if (_rx_done > 0) |
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| 183 | data |= ETHERNET_ST_RX_DONE; |
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| 184 | if (_tx_done > 0) |
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| 185 | data |= ETHERNET_ST_TX_DONE; |
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| 186 | return true; |
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| 187 | |
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| 188 | case ETHERNET_FIFO_SIZE: |
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| 189 | data = VCI_ETHERNET_FIFO_SIZE; |
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| 190 | return true; |
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| 191 | |
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| 192 | case ETHERNET_MAC_LOW: |
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| 193 | data = _mac[0] | (_mac[1] << 8) | (_mac[2] << 16) | (_mac[3] << 24); |
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| 194 | return true; |
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| 195 | |
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| 196 | case ETHERNET_MAC_HIGH: |
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| 197 | data = _mac[4] | (_mac[5] << 8); |
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| 198 | return true; |
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| 199 | |
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| 200 | default: |
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| 201 | return false; |
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| 202 | } |
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| 203 | } |
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| 204 | |
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| 205 | tmpl(void)::write_finish( req_t *req ) |
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| 206 | { |
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| 207 | fifo_entry_t *f = _rx_fifo + (_rx_start + _rx_count - _rx_free - 1) % VCI_ETHERNET_FIFO_SIZE; |
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| 208 | |
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| 209 | assert(req == f->rd_req); |
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| 210 | delete req; |
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| 211 | |
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| 212 | if (req->failed()) { |
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| 213 | std::cout << name() << ": RX dma write error for packet @" << f->addr << std::endl; |
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| 214 | f->status = ETHERNET_RX_DMA_ERR; |
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| 215 | _rx_done++; |
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| 216 | _dma_busy = false; |
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| 217 | |
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| 218 | } else if ((unsigned)f->dma_offset >= f->size) { |
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| 219 | #ifdef SOCLIB_MODULE_DEBUG |
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| 220 | std::cout << name() << ": RX dma done for packet @" << f->addr << std::endl; |
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| 221 | #endif |
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| 222 | f->status = ETHERNET_RX_DONE; |
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| 223 | _rx_done++; |
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| 224 | _dma_busy = false; |
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| 225 | |
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| 226 | } else { |
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| 227 | int chunck_size = std::min((unsigned)CHUNCK_SIZE, f->size - f->dma_offset); |
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| 228 | f->wr_req = new VciInitSimpleWriteReq<vci_param>(f->addr + f->dma_offset, f->data + f->dma_offset, chunck_size); |
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| 229 | f->dma_offset += chunck_size; |
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| 230 | f->wr_req->setDone(this, ON_T(write_finish)); |
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| 231 | f->wr_req->setPacket(0x4); |
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| 232 | m_vci_init_fsm.doReq(f->wr_req); |
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| 233 | } |
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| 234 | } |
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| 235 | |
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| 236 | tmpl(void)::read_finish( req_t *req ) |
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| 237 | { |
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| 238 | fifo_entry_t *f = _tx_fifo + (_tx_start + _tx_count - _tx_waiting - 1) % VCI_ETHERNET_FIFO_SIZE; |
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| 239 | |
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| 240 | assert(req == f->rd_req); |
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| 241 | delete req; |
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| 242 | |
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| 243 | if (req->failed()) { |
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| 244 | std::cout << name() << ": TX dma read error for packet @" << f->addr << std::endl; |
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| 245 | f->status = ETHERNET_TX_DMA_ERR; |
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| 246 | _tx_done++; |
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| 247 | _dma_busy = false; |
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| 248 | |
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| 249 | } else if ((unsigned)f->dma_offset >= f->size) { |
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| 250 | #ifdef SOCLIB_MODULE_DEBUG |
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| 251 | std::cout << name() << ": TX dma done for packet @" << f->addr << std::endl; |
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| 252 | #endif |
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| 253 | f->status = ETHERNET_TX_DONE; |
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| 254 | |
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| 255 | if (!_link_up || ::write(_fd, f->data, f->size) != f->size) { |
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| 256 | std::cout << name() << ": TX tap write error for packet @" << f->addr << std::endl; |
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| 257 | f->status = ETHERNET_TX_PHY_ERR; |
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| 258 | _link_check_counter = 1; |
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| 259 | } |
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| 260 | |
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| 261 | _tx_done++; |
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| 262 | _dma_busy = false; |
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| 263 | |
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| 264 | } else { |
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| 265 | int chunck_size = std::min((unsigned)CHUNCK_SIZE, f->size - f->dma_offset); |
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| 266 | f->rd_req = new VciInitSimpleReadReq<vci_param>(f->data + f->dma_offset, f->addr + f->dma_offset, chunck_size); |
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| 267 | f->dma_offset += chunck_size; |
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| 268 | f->rd_req->setDone(this, ON_T(read_finish)); |
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| 269 | m_vci_init_fsm.doReq(f->rd_req); |
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| 270 | } |
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| 271 | } |
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| 272 | |
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| 273 | tmpl(void)::cleanup_fifos() |
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| 274 | { |
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| 275 | for (int i = 0; i < _rx_count; i++) { |
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| 276 | fifo_entry_t *f = _rx_fifo + (_rx_start + i) % VCI_ETHERNET_FIFO_SIZE; |
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| 277 | free(f->data); |
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| 278 | } |
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| 279 | |
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| 280 | for (int i = 0; i < _tx_count; i++) { |
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| 281 | fifo_entry_t *f = _tx_fifo + (_tx_start + i) % VCI_ETHERNET_FIFO_SIZE; |
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| 282 | free(f->data); |
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| 283 | } |
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| 284 | } |
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| 285 | |
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| 286 | tmpl(void)::transition() |
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| 287 | { |
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| 288 | if (!p_resetn || _soft_reset) { |
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| 289 | m_vci_target_fsm.reset(); |
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| 290 | m_vci_init_fsm.reset(); |
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| 291 | _soft_reset = false; |
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| 292 | |
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| 293 | cleanup_fifos(); |
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| 294 | |
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| 295 | _rx_start = _rx_free = _rx_done = _rx_count = 0; |
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| 296 | _tx_start = _tx_waiting = _tx_done = _tx_count = 0; |
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| 297 | _rx_irq_en = _tx_irq_en = _link_irq_en = false; |
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| 298 | _link_check_counter = 1; |
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| 299 | _link_changed = _link_up = false; |
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| 300 | _dma_busy = false; |
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| 301 | return; |
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| 302 | } |
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| 303 | |
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| 304 | if (_fd >= 0 && --_link_check_counter <= 0) { |
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| 305 | _link_check_counter = 100000; |
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| 306 | |
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| 307 | int sock = socket(AF_INET, SOCK_DGRAM, 0); |
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| 308 | |
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| 309 | if (sock >= 0) { |
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| 310 | if (ioctl(sock, SIOCGIFFLAGS, &_tap_ifr) < 0) { |
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| 311 | std::cout << name() << ": link status check error: " << _tap_ifr.ifr_flags << std::endl; |
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| 312 | } else if (_link_up != !!(_tap_ifr.ifr_flags & IFF_UP)) { |
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| 313 | _link_up = !_link_up; |
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| 314 | _link_changed = true; |
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| 315 | #ifdef SOCLIB_MODULE_DEBUG |
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| 316 | std::cout << name() << ": link status changed to: " << (_link_up ? "up" : "down") << std::endl; |
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| 317 | #endif |
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| 318 | } |
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| 319 | close(sock); |
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| 320 | } |
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| 321 | } |
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| 322 | |
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| 323 | if (!_dma_busy) { |
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| 324 | |
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| 325 | if (_tx_waiting > 0) { |
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| 326 | |
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| 327 | fifo_entry_t *f = _tx_fifo + (_tx_start + _tx_count - _tx_waiting--) % VCI_ETHERNET_FIFO_SIZE; |
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| 328 | |
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| 329 | // start DMA read |
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| 330 | int chunck_size = std::min((unsigned)CHUNCK_SIZE, f->size); |
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| 331 | if ((f->addr & CHUNCK_MASK) != ((f->addr + chunck_size) & CHUNCK_MASK)) { |
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| 332 | chunck_size = ((f->addr & CHUNCK_MASK) + CHUNCK_SIZE) - f->addr; |
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| 333 | } |
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| 334 | f->rd_req = new VciInitSimpleReadReq<vci_param>(f->data, f->addr, chunck_size); |
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| 335 | f->dma_offset = chunck_size; |
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| 336 | f->rd_req->setDone(this, ON_T(read_finish)); |
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| 337 | m_vci_init_fsm.doReq(f->rd_req); |
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| 338 | _dma_busy = true; |
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| 339 | |
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| 340 | #ifdef SOCLIB_MODULE_DEBUG |
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| 341 | std::cout << name() << ": started TX dma read @" << f->addr << ", " << f->size << " bytes " << std::endl; |
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| 342 | #endif |
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| 343 | } else if (_rx_free > 0 && _link_up) { |
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| 344 | |
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| 345 | fifo_entry_t *f = _rx_fifo + (_rx_start + _rx_count - _rx_free) % VCI_ETHERNET_FIFO_SIZE; |
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| 346 | int rd = ::read(_fd, f->data, f->size); |
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| 347 | |
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| 348 | if (rd < 0 && errno != EAGAIN) { |
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| 349 | f->status = ETHERNET_RX_PHY_ERR; |
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| 350 | _rx_done++; |
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| 351 | std::cout << name() << ": tap read error on RX" << std::endl; |
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| 352 | _link_check_counter = 1; |
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| 353 | |
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| 354 | } else if (rd > 0) { |
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| 355 | if (_rx_free > 0) { |
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| 356 | f->size = rd; |
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| 357 | _rx_free--; |
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| 358 | |
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| 359 | // start DMA write |
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| 360 | int chunck_size = std::min((unsigned)CHUNCK_SIZE, f->size); |
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| 361 | if ((f->addr & CHUNCK_MASK) != ((f->addr + chunck_size) & CHUNCK_MASK)) { |
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| 362 | chunck_size = ((f->addr & CHUNCK_MASK) + CHUNCK_SIZE) - f->addr; |
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| 363 | } |
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| 364 | f->wr_req = new VciInitSimpleWriteReq<vci_param>(f->addr, f->data, chunck_size); |
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| 365 | f->dma_offset = chunck_size; |
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| 366 | f->wr_req->setDone(this, ON_T(write_finish)); |
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| 367 | f->wr_req->setPacket(0x4); |
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| 368 | m_vci_init_fsm.doReq(f->wr_req); |
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| 369 | _dma_busy = true; |
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| 370 | |
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| 371 | #ifdef SOCLIB_MODULE_DEBUG |
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| 372 | std::cout << name() << ": started RX dma write @" << f->addr << ", " << f->size << " bytes " << std::endl; |
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| 373 | #endif |
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| 374 | } |
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| 375 | else { |
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| 376 | std::cout << name() << ": No rx buffer free so paquet is dropped" << std::endl; |
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| 377 | } |
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| 378 | } |
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| 379 | } |
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| 380 | } |
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| 381 | |
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| 382 | m_vci_target_fsm.transition(); |
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| 383 | m_vci_init_fsm.transition(); |
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| 384 | } |
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| 385 | |
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| 386 | tmpl(void)::genMoore() |
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| 387 | { |
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| 388 | m_vci_target_fsm.genMoore(); |
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| 389 | m_vci_init_fsm.genMoore(); |
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| 390 | |
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| 391 | p_irq = (_rx_irq_en && _rx_done > 0) || (_tx_irq_en && _tx_done > 0) || (_link_changed && _link_irq_en); |
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| 392 | } |
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| 393 | |
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| 394 | tmpl(/**/)::VciEthernet(sc_module_name name, const MappingTable &mt, |
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| 395 | const IntTab &srcid, const IntTab &tgtid, |
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| 396 | const std::string &if_name) |
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| 397 | : caba::BaseModule(name), |
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| 398 | m_vci_target_fsm(p_vci_target, mt.getSegmentList(tgtid)), |
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| 399 | m_vci_init_fsm(p_vci_initiator, mt.indexForId(srcid)), |
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| 400 | p_clk("clk"), |
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| 401 | p_resetn("resetn"), |
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| 402 | p_vci_target("vci_target"), |
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| 403 | p_vci_initiator("vci_initiator"), |
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| 404 | p_irq("irq") |
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| 405 | { |
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| 406 | m_vci_target_fsm.on_read_write(on_read, on_write); |
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| 407 | _fd = open("/dev/net/tun", O_RDWR); |
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| 408 | |
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| 409 | if ( _fd < 0 ) { |
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| 410 | std::cerr << name << ": Unable to open /dev/net/tun" << std::endl; |
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| 411 | } else { |
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| 412 | int flags = fcntl(_fd, F_GETFL, 0); |
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| 413 | fcntl(_fd, F_SETFL, flags | O_NONBLOCK); |
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| 414 | |
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| 415 | memset((void*)&_tap_ifr, 0, sizeof(_tap_ifr)); |
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| 416 | _tap_ifr.ifr_flags = IFF_TAP | IFF_NO_PI; |
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| 417 | strncpy(_tap_ifr.ifr_name, if_name.c_str(), IFNAMSIZ); |
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| 418 | |
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| 419 | |
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| 420 | if (ioctl(_fd, TUNSETIFF, (void *) &_tap_ifr) < 0) { |
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| 421 | close(_fd); |
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| 422 | _fd = -1; |
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| 423 | std::cerr << name << ": Unable to setup tap interface, check privileges." |
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| 424 | #ifdef __linux__ |
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| 425 | << " (try: sudo setcap cap_net_admin=eip ./system.x)" |
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| 426 | #endif |
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| 427 | << std::endl; |
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| 428 | } |
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| 429 | flags = 2; |
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| 430 | if (ioctl(_fd, TUNSETDEBUG, (void *) &flags) < 0) { |
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| 431 | std::cerr << "Warning couldn't use debug option for TAP" << std::endl; |
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| 432 | } |
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| 433 | |
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| 434 | /* ioctl(_fd, SIOCGIFHWADDR, &_tap_ifr); |
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| 435 | memcpy(_mac, _tap_ifr.ifr_hwaddr.sa_data, 6);*/ |
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| 436 | srand(time(0) * getpid()); |
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| 437 | _mac[0] = 0x00; |
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| 438 | _mac[1] = 0x16; |
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| 439 | _mac[2] = 0x3e; |
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| 440 | _mac[3] = rand(); |
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| 441 | _mac[4] = rand(); |
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| 442 | _mac[5] = rand(); |
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| 443 | } |
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| 444 | |
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| 445 | _link_check_counter = 1; |
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| 446 | _rx_start = _rx_free = _rx_done = _rx_count = 0; |
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| 447 | _tx_start = _tx_waiting = _tx_done = _tx_count = 0; |
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| 448 | _dma_busy = false; |
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| 449 | _link_up = false; |
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| 450 | |
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| 451 | SC_METHOD(transition); |
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| 452 | dont_initialize(); |
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| 453 | sensitive << p_clk.pos(); |
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| 454 | |
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| 455 | SC_METHOD(genMoore); |
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| 456 | dont_initialize(); |
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| 457 | sensitive << p_clk.neg(); |
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| 458 | } |
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| 459 | |
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| 460 | tmpl(/**/)::~VciEthernet() |
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| 461 | { |
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| 462 | cleanup_fifos(); |
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| 463 | |
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| 464 | if (_fd >= 0) |
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| 465 | close(_fd); |
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| 466 | } |
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| 467 | |
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| 468 | }} |
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| 469 | |
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| 470 | // Local Variables: |
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| 471 | // tab-width: 4 |
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| 472 | // c-basic-offset: 4 |
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| 473 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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| 474 | // indent-tabs-mode: nil |
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| 475 | // End: |
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| 476 | |
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| 477 | // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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| 478 | |
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