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