1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_IF_HSR_H_
3#define _LINUX_IF_HSR_H_
4
5#include <linux/types.h>
6
7struct net_device;
8
9/* used to differentiate various protocols */
10enum hsr_version {
11	HSR_V0 = 0,
12	HSR_V1,
13	PRP_V1,
14};
15
16/* HSR Tag.
17 * As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB,
18 * path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest,
19 * h_source, h_proto = 0x88FB }, and add { path, LSDU_size, sequence Nr,
20 * encapsulated protocol } instead.
21 *
22 * Field names as defined in the IEC:2010 standard for HSR.
23 */
24struct hsr_tag {
25	__be16		path_and_LSDU_size;
26	__be16		sequence_nr;
27	__be16		encap_proto;
28} __packed;
29
30#define HSR_HLEN	6
31
32#if IS_ENABLED(CONFIG_HSR)
33extern bool is_hsr_master(struct net_device *dev);
34extern int hsr_get_version(struct net_device *dev, enum hsr_version *ver);
35#else
36static inline bool is_hsr_master(struct net_device *dev)
37{
38	return false;
39}
40static inline int hsr_get_version(struct net_device *dev,
41				  enum hsr_version *ver)
42{
43	return -EINVAL;
44}
45#endif /* CONFIG_HSR */
46
47#endif /*_LINUX_IF_HSR_H_*/
48