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
7 struct net_device;
8
9 /* used to differentiate various protocols */
10 enum 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 */
24 struct 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)
33 extern bool is_hsr_master(struct net_device *dev);
34 extern int hsr_get_version(struct net_device *dev, enum hsr_version *ver);
35 #else
36 static inline bool is_hsr_master(struct net_device *dev)
37 {
38 return false;
39 }
40 static 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
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