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668 | trimarchi | 1 | /* |
2 | * Project: S.Ha.R.K. |
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3 | * |
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4 | * Coordinators: |
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5 | * Giorgio Buttazzo <giorgio@sssup.it> |
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6 | * Paolo Gai <pj@gandalf.sssup.it> |
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7 | * |
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8 | * Authors : |
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9 | * Trimarchi Michael <trimarchi@gandalf.sssup.it> |
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10 | * (see the web pages for full authors list) |
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11 | * |
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12 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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13 | * |
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14 | * http://www.sssup.it |
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15 | * http://retis.sssup.it |
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16 | * http://shark.sssup.it |
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17 | */ |
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18 | |||
19 | /* |
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20 | * Copyright (C) 2000 Giorgio Buttazzo, Paolo Gai |
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21 | * |
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22 | * This program is free software; you can redistribute it and/or modify |
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23 | * it under the terms of the GNU General Public License as published by |
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24 | * the Free Software Foundation; either version 2 of the License, or |
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25 | * (at your option) any later version. |
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26 | * |
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27 | * This program is distributed in the hope that it will be useful, |
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28 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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29 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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30 | * GNU General Public License for more details. |
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31 | * |
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32 | * You should have received a copy of the GNU General Public License |
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33 | * along with this program; if not, write to the Free Software |
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34 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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35 | * |
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36 | * |
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877 | trimarchi | 37 | * CVS : $Id: server-task.c,v 1.8 2004-11-08 10:55:59 trimarchi Exp $ |
668 | trimarchi | 38 | */ |
39 | |||
679 | trimarchi | 40 | #include "ll/i386/64bit.h" |
868 | trimarchi | 41 | #include "fsf_configuration_parameters.h" |
42 | #include "fsf_core.h" |
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43 | #include "fsf_server.h" |
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44 | #include "fsf_service_task.h" |
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45 | #include "message.h" |
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668 | trimarchi | 46 | #include <kernel/kern.h> |
679 | trimarchi | 47 | #include <modules/sem.h> |
48 | #include <modules/hartport.h> |
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668 | trimarchi | 49 | #include <modules/cabs.h> |
50 | |||
868 | trimarchi | 51 | //#define FSF_DEBUG |
52 | |||
53 | TASK service_task(void) { |
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679 | trimarchi | 54 | |
868 | trimarchi | 55 | struct mess msg; |
56 | fsf_renegotiation_status_t status; |
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57 | int wait_renegotiation=0; |
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679 | trimarchi | 58 | PORT rec,tra; |
868 | trimarchi | 59 | |
679 | trimarchi | 60 | rec = port_connect("CHANW",sizeof(struct mess),STREAM,READ); |
668 | trimarchi | 61 | |
679 | trimarchi | 62 | tra = port_connect("CHANR",sizeof(struct mess),STREAM,WRITE); |
668 | trimarchi | 63 | |
64 | while(1) { |
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868 | trimarchi | 65 | // wait for operation |
66 | if (wait_renegotiation) { |
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67 | if (!fsf_get_renegotiation_status(msg.server,&status)) { |
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68 | if (status==FSF_ADMITTED) { |
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69 | // send response server is -1 if the operation fail |
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70 | #ifdef FSF_DEBUG |
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71 | kern_printf("ADM"); |
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72 | #endif |
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73 | wait_renegotiation=0; |
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74 | port_send(tra,&msg,BLOCK); |
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75 | //task_endcycle(); |
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76 | continue; |
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77 | } else |
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78 | #ifdef FSF_DEBUG |
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79 | kern_printf("WAIT") |
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80 | #endif |
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81 | ; |
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82 | } |
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83 | } else { |
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84 | port_receive(rec,&msg,BLOCK); |
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877 | trimarchi | 85 | #ifdef FSF_DEBUG |
868 | trimarchi | 86 | kern_printf("Message "); |
877 | trimarchi | 87 | #endif |
868 | trimarchi | 88 | switch (msg.type) { |
89 | |||
90 | case NEGOTIATE_CONTRACT: |
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91 | if (negotiate_contract(&msg.contract, &msg.server)==FSF_ERR_CONTRACT_REJECTED) |
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92 | msg.server=-1; |
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93 | break; |
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94 | |||
95 | case REQUEST_RENEGOTIATE_CONTRACT: |
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96 | if (renegotiate_contract(&msg.contract, msg.server)==FSF_ERR_CONTRACT_REJECTED) |
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97 | msg.server=-1; |
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98 | break; |
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99 | |||
100 | case RENEGOTIATE_CONTRACT: |
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101 | if (renegotiate_contract(&msg.contract, msg.server)==FSF_ERR_CONTRACT_REJECTED) |
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102 | msg.server=-1; |
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103 | else { |
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104 | wait_renegotiation=1; |
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105 | //task_endcycle(); |
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106 | continue; |
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107 | } |
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108 | break; |
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109 | |||
110 | default : |
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111 | break; |
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112 | |||
113 | } |
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114 | // send response server is -1 if the operation fail |
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115 | port_send(tra,&msg,BLOCK); |
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116 | //task_endcycle(); |
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668 | trimarchi | 117 | |
118 | } |
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119 | } |
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120 | } |
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121 | |||
688 | trimarchi | 122 | |
123 | static __inline void set_contract_parameter(void) { |
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124 | |||
125 | int i=0; |
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679 | trimarchi | 126 | TIME T,Q; |
868 | trimarchi | 127 | |
128 | for (i=0; i<current_server; i++) { |
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679 | trimarchi | 129 | mul32div32to32(MAX_BANDWIDTH,server_list[i].Cmin,server_list[i].U,T); |
130 | if (T > server_list[i].Tmin ) { |
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131 | server_list[i].actual_budget = server_list[i].Cmin; |
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132 | server_list[i].actual_period = T; |
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133 | #ifdef FSF_DEBUG |
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134 | kern_printf("(1 - Q %ld T %ld)", server_list[i].actual_budget, server_list[i].actual_period); |
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135 | #endif |
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136 | if (server_list[i].d_equals_t == TRUE) |
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137 | adjust_SERVER_budget(server_list[i].server,server_list[i].Cmin, T, T); |
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138 | else |
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139 | adjust_SERVER_budget(server_list[i].server,server_list[i].Cmin, T, server_list[i].deadline); |
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140 | |||
141 | } else { |
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142 | mul32div32to32(server_list[i].Tmin,server_list[i].U,MAX_BANDWIDTH,Q); |
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143 | server_list[i].actual_budget = Q; |
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144 | server_list[i].actual_period = server_list[i].Tmin; |
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145 | #ifdef FSF_DEBUG |
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146 | kern_printf("(2 - Q %ld T %ld)", server_list[i].actual_budget, server_list[i].actual_period); |
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147 | #endif |
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148 | |||
149 | if (server_list[i].d_equals_t == TRUE) |
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150 | adjust_SERVER_budget(server_list[i].server,server_list[i].Cmin, server_list[i].Tmin, server_list[i].Tmin); |
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151 | else |
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152 | adjust_SERVER_budget(server_list[i].server,server_list[i].Cmin, server_list[i].Tmin, server_list[i].deadline); |
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153 | } |
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154 | |||
155 | server_list[i].U=server_list[i].Umin; |
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156 | } |
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157 | |||
688 | trimarchi | 158 | } |
159 | |||
160 | |||
161 | int renegotiate_contract |
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162 | (const fsf_contract_parameters_t *new_contract, |
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163 | fsf_server_id_t server) |
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164 | { |
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165 | |||
166 | #ifdef FSF_DEBUG |
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167 | kern_printf("(Renegotiate for server %d)",server); |
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168 | #endif |
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169 | |||
170 | if (!new_contract) |
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868 | trimarchi | 171 | return FSF_ERR_BAD_ARGUMENT; |
688 | trimarchi | 172 | |
173 | if (server < 0) |
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875 | trimarchi | 174 | return FSF_ERR_BAD_ARGUMENT; |
688 | trimarchi | 175 | |
176 | // change the parameter |
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177 | relink_contract_to_server(new_contract, server); |
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178 | if (recalculate_contract(fsf_max_bw)==-1) { |
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875 | trimarchi | 179 | return FSF_ERR_CONTRACT_REJECTED; |
688 | trimarchi | 180 | } |
181 | |||
182 | set_contract_parameter(); |
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183 | |||
679 | trimarchi | 184 | return 0; |
185 | } |
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186 | |||
668 | trimarchi | 187 | int negotiate_contract |
679 | trimarchi | 188 | (const fsf_contract_parameters_t *contract, |
189 | fsf_server_id_t *server) |
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668 | trimarchi | 190 | { |
191 | /* Check if contract is initialized */ |
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868 | trimarchi | 192 | if (!contract) return FSF_ERR_BAD_ARGUMENT; |
668 | trimarchi | 193 | |
194 | /* Admission Test */ |
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195 | if (FSF_ADMISSION_TEST_IS_ENABLED) |
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196 | if (add_contract(contract)) |
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197 | return FSF_ERR_CONTRACT_REJECTED; |
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198 | |||
679 | trimarchi | 199 | /* SERVER => BUDGET */ |
200 | set_SERVER_budget_from_contract(contract,server); |
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668 | trimarchi | 201 | |
688 | trimarchi | 202 | #ifdef FSF_DEBUG |
203 | kern_printf("(New Server %d)",*server); |
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204 | #endif |
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679 | trimarchi | 205 | |
206 | if (*server >= 0) { |
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207 | link_contract_to_server(contract,*server); |
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208 | if (recalculate_contract(fsf_max_bw)==-1) { |
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868 | trimarchi | 209 | remove_contract(server); |
875 | trimarchi | 210 | return FSF_ERR_CONTRACT_REJECTED; |
679 | trimarchi | 211 | } |
688 | trimarchi | 212 | set_contract_parameter(); |
679 | trimarchi | 213 | #ifdef FSF_DEBUG |
214 | kern_printf("(Adjust budget)"); |
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215 | #endif |
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688 | trimarchi | 216 | |
679 | trimarchi | 217 | } |
218 | else { |
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875 | trimarchi | 219 | return FSF_ERR_CONTRACT_REJECTED; |
679 | trimarchi | 220 | } |
688 | trimarchi | 221 | |
679 | trimarchi | 222 | return 0; |
223 | |||
668 | trimarchi | 224 | } |
225 |