| Matt Johnston | f9b99f1 | 2024-09-17 16:48:34 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */ |
| 2 | #pragma once |
| 3 | |
| 4 | #include "libmctp.h" |
| 5 | |
| 6 | /* 64kb should be sufficient for a single message. Applications |
| 7 | * requiring higher sizes can override by setting max_message_size.*/ |
| 8 | #ifndef MCTP_MAX_MESSAGE_SIZE |
| 9 | #define MCTP_MAX_MESSAGE_SIZE 65536 |
| 10 | #endif |
| 11 | |
| 12 | /* Must be >= 2 for bridge busses */ |
| 13 | #ifndef MCTP_MAX_BUSSES |
| 14 | #define MCTP_MAX_BUSSES 2 |
| 15 | #endif |
| 16 | |
| 17 | /* Concurrent reassembly contexts. */ |
| 18 | #ifndef MCTP_REASSEMBLY_CTXS |
| 19 | #define MCTP_REASSEMBLY_CTXS 16 |
| 20 | #endif |
| 21 | |
| 22 | /* Outbound request tags */ |
| 23 | #ifndef MCTP_REQ_TAGS |
| 24 | #define MCTP_REQ_TAGS MCTP_REASSEMBLY_CTXS |
| 25 | #endif |
| 26 | |
| 27 | /* Internal data structures */ |
| 28 | |
| 29 | enum mctp_bus_state { |
| 30 | mctp_bus_state_constructed = 0, |
| 31 | mctp_bus_state_tx_enabled, |
| 32 | mctp_bus_state_tx_disabled, |
| 33 | }; |
| 34 | |
| 35 | struct mctp_bus { |
| 36 | mctp_eid_t eid; |
| 37 | struct mctp_binding *binding; |
| 38 | enum mctp_bus_state state; |
| 39 | struct mctp *mctp; |
| 40 | |
| 41 | /* Current message to transmit */ |
| 42 | void *tx_msg; |
| 43 | /* Position in tx_msg */ |
| 44 | size_t tx_msgpos; |
| 45 | /* Length of tx_msg */ |
| 46 | size_t tx_msglen; |
| 47 | /* Length of current packet payload */ |
| 48 | size_t tx_pktlen; |
| 49 | uint8_t tx_seq; |
| 50 | uint8_t tx_src; |
| 51 | uint8_t tx_dest; |
| 52 | bool tx_to; |
| 53 | uint8_t tx_tag; |
| 54 | |
| 55 | /* todo: routing */ |
| 56 | }; |
| 57 | |
| 58 | struct mctp_msg_ctx { |
| 59 | /* NULL buf indicates an unused mctp_msg_ctx */ |
| 60 | void *buf; |
| 61 | |
| 62 | uint8_t src; |
| 63 | uint8_t dest; |
| 64 | uint8_t tag; |
| 65 | uint8_t last_seq; |
| 66 | size_t buf_size; |
| 67 | size_t buf_alloc_size; |
| 68 | size_t fragment_size; |
| 69 | }; |
| 70 | |
| 71 | struct mctp_req_tag { |
| 72 | /* 0 is an unused entry */ |
| 73 | mctp_eid_t local; |
| 74 | mctp_eid_t remote; |
| 75 | uint8_t tag; |
| 76 | }; |
| 77 | |
| 78 | struct mctp { |
| 79 | int n_busses; |
| 80 | struct mctp_bus busses[MCTP_MAX_BUSSES]; |
| 81 | |
| 82 | /* Message RX callback */ |
| 83 | mctp_rx_fn message_rx; |
| 84 | void *message_rx_data; |
| 85 | |
| 86 | /* Packet capture callback */ |
| 87 | mctp_capture_fn capture; |
| 88 | void *capture_data; |
| 89 | |
| 90 | /* Message reassembly. */ |
| 91 | struct mctp_msg_ctx msg_ctxs[MCTP_REASSEMBLY_CTXS]; |
| 92 | |
| 93 | /* Allocated outbound TO tags */ |
| 94 | struct mctp_req_tag req_tags[MCTP_REQ_TAGS]; |
| 95 | /* used to avoid always allocating tag 0 */ |
| 96 | uint8_t tag_round_robin; |
| 97 | |
| 98 | enum { |
| 99 | ROUTE_ENDPOINT, |
| 100 | ROUTE_BRIDGE, |
| 101 | } route_policy; |
| 102 | size_t max_message_size; |
| 103 | |
| 104 | void *alloc_ctx; |
| 105 | }; |