| Harshit Aghera | 560e6af | 2025-04-21 20:04:56 +0530 | [diff] [blame^] | 1 | /* |
| 2 | * SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & |
| 3 | * AFFILIATES. All rights reserved. |
| 4 | * SPDX-License-Identifier: Apache-2.0 |
| 5 | */ |
| 6 | |
| 7 | #include "OcpMctpVdm.hpp" |
| 8 | |
| 9 | #include <endian.h> |
| 10 | |
| 11 | #include <cerrno> |
| 12 | #include <cstdint> |
| 13 | #include <cstring> |
| 14 | #include <span> |
| 15 | |
| 16 | namespace ocp |
| 17 | { |
| 18 | namespace accelerator_management |
| 19 | { |
| 20 | |
| 21 | int packHeader(uint16_t pciVendorId, const BindingPciVidInfo& hdr, |
| 22 | BindingPciVid& msg) |
| 23 | { |
| 24 | if (hdr.ocp_accelerator_management_msg_type != |
| 25 | static_cast<uint8_t>(MessageType::RESPONSE) && |
| 26 | hdr.ocp_accelerator_management_msg_type != |
| 27 | static_cast<uint8_t>(MessageType::REQUEST)) |
| 28 | { |
| 29 | return EINVAL; |
| 30 | } |
| 31 | |
| 32 | if (hdr.instance_id > instanceMax) |
| 33 | { |
| 34 | return EINVAL; |
| 35 | } |
| 36 | |
| 37 | msg.instance_id = hdr.instance_id & instanceIdBitMask; |
| 38 | |
| 39 | if (hdr.ocp_accelerator_management_msg_type == |
| 40 | static_cast<uint8_t>(MessageType::REQUEST)) |
| 41 | { |
| 42 | msg.instance_id |= requestBitMask; |
| 43 | } |
| 44 | else |
| 45 | { |
| 46 | msg.instance_id &= ~requestBitMask; |
| 47 | } |
| 48 | |
| 49 | msg.pci_vendor_id = htobe16(pciVendorId); |
| 50 | msg.instance_id &= ~instanceIdReservedBitMask; |
| 51 | msg.ocp_version = ocpVersion & ocpVersionBitMask; |
| 52 | msg.ocp_version |= (ocpType << ocpTypeBitOffset) & ocpTypeBitMask; |
| 53 | msg.ocp_accelerator_management_msg_type = hdr.msg_type; |
| 54 | |
| 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | int decodeReasonCodeAndCC(const std::span<const uint8_t> buf, |
| 59 | CompletionCode& cc, uint16_t& reasonCode) |
| 60 | { |
| 61 | if (buf.size() < |
| 62 | sizeof(ocp::accelerator_management::CommonNonSuccessResponse)) |
| 63 | { |
| 64 | return EINVAL; |
| 65 | } |
| 66 | |
| 67 | // These expression decodes data communicated over the network |
| 68 | // The use of reinterpret_cast enables direct memory access to raw byte |
| 69 | // buffers without doing unnecessary data copying |
| 70 | // NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast) |
| 71 | const auto* response = reinterpret_cast< |
| 72 | const ocp::accelerator_management::CommonNonSuccessResponse*>( |
| 73 | buf.data()); |
| 74 | |
| 75 | cc = static_cast<CompletionCode>(response->completion_code); |
| 76 | if (cc == CompletionCode::SUCCESS) |
| 77 | { |
| 78 | reasonCode = 0; |
| 79 | return 0; |
| 80 | } |
| 81 | |
| 82 | // reason code is expected to be present if CC != SUCCESS |
| 83 | reasonCode = le16toh(response->reason_code); |
| 84 | |
| 85 | return 0; |
| 86 | } |
| 87 | } // namespace accelerator_management |
| 88 | } // namespace ocp |