1 /* 2 * Copyright 2021 Google LLC 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 #ifndef PLATFORMS_NEMORA_PORTABLE_NET_TYPES_H_ 18 #define PLATFORMS_NEMORA_PORTABLE_NET_TYPES_H_ 19 20 #include <stdint.h> 21 22 // Buffer big enough for largest frame we expect 23 // to receive from EMAC (in bytes) 24 // 1500 (max payload IEEE 802.3) + 25 // 14 (header) + 26 // 4 (crc, if not stripped by EMAC) + 27 // 4 (optional VLAN tag, if not stripped by EMAC) 28 #define ETH_BUFFER_SIZE 1522 29 #define IPV4_ETHERTYPE 0x0800 30 #define IPV6_ADDR_SIZE 16 31 #define MAC_ADDR_SIZE 6 32 33 #ifndef __packed 34 #define __packed __attribute__((packed)) 35 #endif 36 37 /* MAC address */ 38 typedef struct __packed { 39 uint8_t octet[MAC_ADDR_SIZE]; // network order 40 } mac_addr_t; 41 42 /* 43 * Ethernet header. 44 * Note: This assumes a packet without VLAN tags. 45 * TODO: configure HW to strip VLAN field. 46 */ 47 typedef struct __packed { 48 mac_addr_t dest; 49 mac_addr_t src; 50 uint16_t ethertype; 51 } eth_hdr_t; 52 53 #endif // PLATFORMS_NEMORA_PORTABLE_NET_TYPES_H_ 54