| 1 | // ========== Copyright Header Begin ========================================== |
| 2 | // |
| 3 | // OpenSPARC T2 Processor File: replay_buffer.cpp |
| 4 | // Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved |
| 5 | // 4150 Network Circle, Santa Clara, California 95054, U.S.A. |
| 6 | // |
| 7 | // * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 8 | // |
| 9 | // This program is free software; you can redistribute it and/or modify |
| 10 | // it under the terms of the GNU General Public License as published by |
| 11 | // the Free Software Foundation; version 2 of the License. |
| 12 | // |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU General Public License for more details. |
| 17 | // |
| 18 | // You should have received a copy of the GNU General Public License |
| 19 | // along with this program; if not, write to the Free Software |
| 20 | // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | // |
| 22 | // For the avoidance of doubt, and except that if any non-GPL license |
| 23 | // choice is available it will apply instead, Sun elects to use only |
| 24 | // the General Public License version 2 (GPLv2) at this time for any |
| 25 | // software where a choice of GPL license versions is made |
| 26 | // available with the language indicating that GPLv2 or any later version |
| 27 | // may be used, or where a choice of which version of the GPL is applied is |
| 28 | // otherwise unspecified. |
| 29 | // |
| 30 | // Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 31 | // CA 95054 USA or visit www.sun.com if you need additional information or |
| 32 | // have any questions. |
| 33 | // |
| 34 | // ========== Copyright Header End ============================================ |
| 35 | #ifndef DLL_replay_buffer_h |
| 36 | #define DLL_replay_buffer_h |
| 37 | |
| 38 | #include "dll_top.hpp" |
| 39 | |
| 40 | |
| 41 | namespace pcie { |
| 42 | |
| 43 | /** This function adds packets to the replay buffer **/ |
| 44 | void dll_top::buffer_add( RefPciePacket packet){ |
| 45 | |
| 46 | replay_buffer.push(packet); |
| 47 | if ( packet->get_size() < replay_buffer_size ) |
| 48 | replay_buffer_size-=packet->get_size(); |
| 49 | else |
| 50 | replay_buffer_size=0; |
| 51 | |
| 52 | LOG_DEBUG << "REPLAY_BUFFER: Added packet " << packet->getPacketId() << ". Current replay buffer size:" << replay_buffer_size ; |
| 53 | } |
| 54 | |
| 55 | /** This function removes elements from the replay buffer **/ |
| 56 | //void dll_top::buffer_remove( RefPciePacket packet){ |
| 57 | void dll_top::buffer_remove(sc_uint<12> seq_num){ |
| 58 | if(in_replay_buffer(seq_num)){ |
| 59 | sc_uint<12> rx_pkt_seq_num; |
| 60 | sc_uint<8> byte_seq_num; |
| 61 | USE_NAMESPACE(std)queue<RefPciePacket> tmp_replay_buffer2; |
| 62 | RefPciePacket list_packet; |
| 63 | bool acked=true; |
| 64 | while(!replay_buffer.empty()){ |
| 65 | list_packet = replay_buffer.front(); |
| 66 | replay_buffer.pop(); |
| 67 | |
| 68 | byte_seq_num= list_packet->get_byte(1); |
| 69 | rx_pkt_seq_num.range(11,8)=byte_seq_num.range(3,0); |
| 70 | byte_seq_num= list_packet->get_byte(2); |
| 71 | rx_pkt_seq_num.range(7,0)=byte_seq_num.range(7,0); |
| 72 | |
| 73 | if(seq_num==rx_pkt_seq_num) |
| 74 | { |
| 75 | //replay_buffer_size+= packet->get_size(); |
| 76 | LOG_DEBUG << "REPLAY_BUFFER: 1removed " << rx_pkt_seq_num; |
| 77 | acked=false; |
| 78 | } |
| 79 | else if(!acked){ |
| 80 | tmp_replay_buffer2.push(list_packet); |
| 81 | } |
| 82 | else{ |
| 83 | //replay_buffer_size+= packet->get_size(); |
| 84 | LOG_DEBUG << "REPLAY_BUFFER: 2removed " << rx_pkt_seq_num; |
| 85 | } |
| 86 | }// while |
| 87 | replay_buffer = tmp_replay_buffer2; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | /** This function replays all entries in the buffer **/ |
| 92 | void dll_top::buffer_replay(sc_uint<12> seq_num){ |
| 93 | dll_pl_tlp_out.purge_channel(); |
| 94 | if(REPLAY_NUM==3){ |
| 95 | LOG_WARNING << "DLL: REPLAY_BUFFER: REPLAY_NUM ROLLOVER. Need to Retrain Link..." ; |
| 96 | //notify an event |
| 97 | //Setting retrain bit in Link Ctrl CSR |
| 98 | sc_uint<64> lnk_ctrl_reg = csr_port.read_csr(PEU_CSR_A_LNK_CTL_HW_ADDR); |
| 99 | lnk_ctrl_reg(5,5)=1; |
| 100 | csr_port.write_csr(PEU_CSR_A_LNK_CTL_HW_ADDR,lnk_ctrl_reg); |
| 101 | dll_pl_tlp_out.purge_channel(); |
| 102 | } |
| 103 | REPLAY_NUM++; |
| 104 | REPLAY_TIMER=0; |
| 105 | |
| 106 | if(seq_num>ACKD_SEQ){ |
| 107 | LOG_DEBUG<<"Fwd progress in seq num ack"; |
| 108 | REPLAY_NUM=0; |
| 109 | } |
| 110 | |
| 111 | sc_uint<12> rx_pkt_seq_num; |
| 112 | sc_uint<8> byte_seq_num; |
| 113 | RefPciePacket list_packet; |
| 114 | USE_NAMESPACE(std)queue<RefPciePacket> tmp_replay_buffer2; |
| 115 | |
| 116 | if(in_replay_buffer(seq_num)){ |
| 117 | bool replay = false; |
| 118 | while (!replay_buffer.empty()) |
| 119 | { |
| 120 | // get packet from replay buffer |
| 121 | list_packet = replay_buffer.front(); |
| 122 | replay_buffer.pop(); |
| 123 | //Extract seq num |
| 124 | byte_seq_num = list_packet->get_byte(1); |
| 125 | rx_pkt_seq_num.range(11,8) = byte_seq_num.range(3,0); |
| 126 | byte_seq_num = list_packet->get_byte(2); |
| 127 | rx_pkt_seq_num.range(7,0) = byte_seq_num.range(7,0); |
| 128 | if(rx_pkt_seq_num==seq_num){ |
| 129 | replay=true; |
| 130 | } |
| 131 | else if(replay){ |
| 132 | LOG_DEBUG << "REPLAY_BUFFER: Replay packet " << rx_pkt_seq_num ; |
| 133 | // send packet to pl to be retried |
| 134 | dll_pl_tlp_out.send_packet(list_packet); |
| 135 | // copy packet to tmp list |
| 136 | tmp_replay_buffer2.push(list_packet); |
| 137 | } |
| 138 | }// while |
| 139 | replay_buffer = tmp_replay_buffer2; |
| 140 | } |
| 141 | else{ |
| 142 | LOG_DEBUG << "REPLAY_BUFFER: TLP not found. Replaying entire replay buffer..." ; |
| 143 | //A NAK for a TLP not in the replay buffer |
| 144 | //The whole replay buffer has to be replayed... |
| 145 | while (!replay_buffer.empty()) |
| 146 | { |
| 147 | // get packet from replay buffer |
| 148 | list_packet = replay_buffer.front(); |
| 149 | replay_buffer.pop(); |
| 150 | //Extract seq num |
| 151 | byte_seq_num = list_packet->get_byte(1); |
| 152 | rx_pkt_seq_num.range(11,8) = byte_seq_num.range(3,0); |
| 153 | byte_seq_num = list_packet->get_byte(2); |
| 154 | rx_pkt_seq_num.range(7,0) = byte_seq_num.range(7,0); |
| 155 | LOG_DEBUG << "REPLAY_BUFFER: Replay packet " << rx_pkt_seq_num ; |
| 156 | // send packet to pl to be retried |
| 157 | dll_pl_tlp_out.send_packet(list_packet); |
| 158 | // copy packet to tmp list |
| 159 | tmp_replay_buffer2.push(list_packet); |
| 160 | }// while |
| 161 | replay_buffer = tmp_replay_buffer2; |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | /** This function replays a single element from the replay buffer **/ |
| 166 | void dll_top::buffer_replay_single( sc_uint<12> seq_id){ |
| 167 | sc_uint<12> rx_pkt_seq_num; |
| 168 | sc_uint<8> byte_seq_num; |
| 169 | |
| 170 | //RefPciePacket list_packet; |
| 171 | RefPciePacket list_packet; |
| 172 | USE_NAMESPACE(std)queue<RefPciePacket> tmp_replay_buffer2; |
| 173 | |
| 174 | while ( !replay_buffer.empty() ) |
| 175 | { |
| 176 | // get packet from replay buffer |
| 177 | list_packet = replay_buffer.front(); |
| 178 | replay_buffer.pop(); |
| 179 | // send packet to pl to be retried |
| 180 | byte_seq_num= list_packet->get_byte(1); |
| 181 | rx_pkt_seq_num.range(11,8)=byte_seq_num.range(3,0); |
| 182 | byte_seq_num= list_packet->get_byte(2); |
| 183 | rx_pkt_seq_num.range(7,0)=byte_seq_num.range(7,0); |
| 184 | if ( rx_pkt_seq_num == seq_id ) { |
| 185 | dll_pl_dllp_out.send_packet(list_packet); |
| 186 | LOG_DEBUG << "REPLAY_BUFFER: SINGLE Replay packet " << rx_pkt_seq_num ; |
| 187 | } |
| 188 | // copy packet to tmp list |
| 189 | tmp_replay_buffer2.push(list_packet); |
| 190 | }// while |
| 191 | replay_buffer = tmp_replay_buffer2; |
| 192 | } |
| 193 | |
| 194 | bool dll_top::in_replay_buffer(sc_uint<12> seq_num) |
| 195 | { |
| 196 | bool is_in_buffer = false; |
| 197 | sc_uint<12> rx_pkt_seq_num; |
| 198 | sc_uint<8> byte_seq_num; |
| 199 | |
| 200 | //RefPciePacket list_packet; |
| 201 | RefPciePacket list_packet; |
| 202 | USE_NAMESPACE(std)queue<RefPciePacket> tmp_replay_buffer2; |
| 203 | while (!replay_buffer.empty()) |
| 204 | { |
| 205 | // get packet from replay buffer |
| 206 | list_packet = replay_buffer.front(); |
| 207 | replay_buffer.pop(); |
| 208 | //Extract seq num |
| 209 | byte_seq_num = list_packet->get_byte(1); |
| 210 | rx_pkt_seq_num.range(11,8) = byte_seq_num.range(3,0); |
| 211 | byte_seq_num = list_packet->get_byte(2); |
| 212 | rx_pkt_seq_num.range(7,0) = byte_seq_num.range(7,0); |
| 213 | if(rx_pkt_seq_num==seq_num){ |
| 214 | is_in_buffer=true; |
| 215 | } |
| 216 | tmp_replay_buffer2.push(list_packet); |
| 217 | }// while |
| 218 | replay_buffer = tmp_replay_buffer2; |
| 219 | |
| 220 | return is_in_buffer; |
| 221 | } |
| 222 | |
| 223 | } |
| 224 | #endif |