1 /* 2 * Copyright 2018 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "pcie_i2c.hpp" 18 19 #include "main.hpp" 20 21 #include <cstdint> 22 #include <cstring> 23 #include <string> 24 #include <tuple> 25 #include <vector> 26 27 namespace google 28 { 29 namespace ipmi 30 { 31 32 #ifndef MAX_IPMI_BUFFER 33 #define MAX_IPMI_BUFFER 64 34 #endif 35 36 struct PcieSlotCountRequest 37 { 38 uint8_t subcommand; 39 } __attribute__((packed)); 40 41 struct PcieSlotCountReply 42 { 43 uint8_t subcommand; 44 uint8_t value; 45 } __attribute__((packed)); 46 47 struct PcieSlotI2cBusMappingRequest 48 { 49 uint8_t subcommand; 50 uint8_t entry; 51 } __attribute__((packed)); 52 53 struct PcieSlotI2cBusMappingReply 54 { 55 uint8_t subcommand; 56 uint8_t i2c_bus_number; 57 uint8_t pcie_slot_name_len; 58 uint8_t pcie_slot_name[0]; 59 } __attribute__((packed)); 60 61 ipmi_ret_t pcieSlotCount(const uint8_t* reqBuf, uint8_t* replyBuf, 62 size_t* dataLen, HandlerInterface* handler) 63 { 64 if ((*dataLen) < sizeof(struct PcieSlotCountRequest)) 65 { 66 std::fprintf(stderr, "Invalid command length: %u\n", 67 static_cast<uint32_t>(*dataLen)); 68 return IPMI_CC_REQ_DATA_LEN_INVALID; 69 } 70 71 // If there are already entries in the vector, clear them. 72 handler->buildI2cPcieMapping(); 73 74 struct PcieSlotCountReply reply; 75 reply.subcommand = SysPcieSlotCount; 76 // Fill the pcie slot count as the number of entries in the vector. 77 reply.value = handler->getI2cPcieMappingSize(); 78 79 std::memcpy(&replyBuf[0], &reply, sizeof(reply)); 80 81 // Return the subcommand and the result. 82 (*dataLen) = sizeof(reply); 83 84 return IPMI_CC_OK; 85 } 86 87 ipmi_ret_t pcieSlotI2cBusMapping(const uint8_t* reqBuf, uint8_t* replyBuf, 88 size_t* dataLen, HandlerInterface* handler) 89 { 90 struct PcieSlotI2cBusMappingRequest request; 91 92 if ((*dataLen) < sizeof(request)) 93 { 94 std::fprintf(stderr, "Invalid command length: %u\n", 95 static_cast<uint32_t>(*dataLen)); 96 return IPMI_CC_REQ_DATA_LEN_INVALID; 97 } 98 99 // If there are no entries in the vector return error. 100 size_t mapSize = handler->getI2cPcieMappingSize(); 101 if (mapSize == 0) 102 { 103 return IPMI_CC_INVALID_RESERVATION_ID; 104 } 105 106 std::memcpy(&request, &reqBuf[0], sizeof(request)); 107 108 // The valid entries range from 0 to N - 1, N being the total number of 109 // entries in the vector. 110 if (request.entry >= mapSize) 111 { 112 return IPMI_CC_PARM_OUT_OF_RANGE; 113 } 114 115 // Get the i2c bus number and the pcie slot name from the vector. 116 auto i2cEntry = handler->getI2cEntry(request.entry); 117 uint32_t i2c_bus_number = std::get<0>(i2cEntry); 118 std::string pcie_slot_name = std::get<1>(i2cEntry); 119 120 int length = 121 sizeof(struct PcieSlotI2cBusMappingReply) + pcie_slot_name.length(); 122 123 // TODO (jaghu) : Add a way to dynamically receive the MAX_IPMI_BUFFER 124 // value and change error to IPMI_CC_REQUESTED_TOO_MANY_BYTES. 125 if (length > MAX_IPMI_BUFFER) 126 { 127 std::fprintf(stderr, "Response would overflow response buffer\n"); 128 return IPMI_CC_INVALID; 129 } 130 131 auto reply = 132 reinterpret_cast<struct PcieSlotI2cBusMappingReply*>(&replyBuf[0]); 133 reply->subcommand = SysPcieSlotI2cBusMapping; 134 // Copy the i2c bus number and the pcie slot name to the reply struct. 135 reply->i2c_bus_number = i2c_bus_number; 136 reply->pcie_slot_name_len = pcie_slot_name.length(); 137 std::memcpy(reply->pcie_slot_name, pcie_slot_name.c_str(), 138 pcie_slot_name.length()); 139 140 // Return the subcommand and the result. 141 (*dataLen) = length; 142 return IPMI_CC_OK; 143 } 144 } // namespace ipmi 145 } // namespace google 146