include/linux/if_hsr.h

   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_*/